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GB 51093-2015: Technical code for hydrochloric acid regeneration engineering according to spraying and roasting technology of iron and steel enterprises
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Technical code for hydrochloric acid regeneration engineering according to spraying and roasting technology of iron and steel enterprises
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GB 51093-2015
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Basic data | Standard ID | GB 51093-2015 (GB51093-2015) | | Description (Translated English) | Technical code for hydrochloric acid regeneration engineering according to spraying and roasting technology of iron and steel enterprises | | Sector / Industry | National Standard | | Classification of Chinese Standard | P73 | | Classification of International Standard | 77.01 | | Word Count Estimation | 85,840 | | Date of Issue | 2015-03-08 | | Date of Implementation | 2015-11-01 | | Quoted Standard | GB 50009; GB 50011; GB 50015; GB 50016; GB 50019; GB 50028; GB 50034; GB 50046; GB 50054; GB 50057; GB 50058; GB 50093; GB 50116; GB 50126; GB 50140; GB 50168; GB 50184; GB 50204; GB 50205; GB 50211; GB 50212; GB 50217; GB 50224; GB 50235; GB 50236; GB 50254; GB 50275; GB 50311 | | Regulation (derived from) | Ministry of Housing and Urban-Rural Development Announcement No.777 | | Issuing agency(ies) | Ministry of Housing and Urban-Rural Development of the People's Republic of China; General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China | | Summary | This standard is applicable to the construction, operation and maintenance management of the new and reconstructed hydrochloric acid waste liquid recycle project of spray roasting method. | GB 51093-2015: Technical code for hydrochloric acid regeneration engineering according to spraying and roasting technology of iron and steel enterprises
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1 General
1.0.1 In order to improve the technical level of the hydrochloric acid waste liquid regeneration project of the spray roasting method in iron and steel enterprises, ensure the project quality, achieve advanced technology, reasonable economy and environmental protection, this specification is formulated.
1.0.2 This specification is applicable to the construction, operation and maintenance management of newly-built and reconstructed spray-roasting hydrochloric acid waste liquid regeneration projects in iron and steel enterprises.
1.0.3 The construction of the hydrochloric acid waste liquid regeneration project of the spray roasting method in iron and steel enterprises shall not only comply with this specification, but also comply with the current relevant national standards.
2 terms
2.0.1 Hydrochloric acid regeneration process
The hydrochloric acid waste liquid produced by the pickling unit is treated, and a series of chemical reactions are performed to generate regenerated acid that can be used again in the pickling unit.
2.0.2 Spraying and roasting technology
The waste hydrochloric acid is sprayed into the roasting furnace in the form of mist, and the chemical reaction is carried out in a high-temperature environment to generate regeneration acid and iron oxide powder.
2.0.3 tank farm
Area for setting up liquid storage tanks for fresh acid, spent acid, regenerated acid, rinse water, etc.
2.0.4 waste acid
The waste hydrochloric acid produced by the pickling unit.
2.0.5 Regenerated acid regenerated acid
The hydrochloric acid produced by the hydrochloric acid regeneration unit can be used again for the pickling unit.
2.0.6 fresh acid
Purchased commodity hydrochloric acid.
2.0.7 rinse water rinse water
The discharge water after cleaning the strip in the rinsing process section of the pickling unit.
2.0.8 ferric oxide
Powdered iron oxide produced by spray roasting.
2.0.9 concentrated acid
After heat exchange in the pre-concentrator, the concentrated waste acid is circulated.
2.0.10 roaster roaster
In a high-temperature environment, the sprayed concentrated acid is vaporized and chemically reacted to generate hydrogen chloride gas and iron oxide powder.
2.0.11 acid gun spray boom
A device that sprays concentrated acid in mist form from the top of the roaster.
2.0.12 Cyclone separator
It is installed between the roasting furnace and the pre-concentrator to separate the iron oxide powder in the flue gas.
2.0.13 Preconcentrator preconcentrator
It is used to cool down and remove dust from the flue gas of the roaster, and to concentrate the waste acid.
2.0.14 Absorption column
Equipment that absorbs hydrogen chloride in flue gas to generate regenerative acid.
2.0.15 Scrubber
Equipment for removing hydrogen chloride and iron oxide powder remaining in the flue gas by washing.
2.0.16 chlorine remover
Equipment for reducing the chlorine content in iron oxide powder by heating.
2.0.17 acid operation mode
After the waste acid passes through the pre-concentrator, it is sprayed into the production mode of the roaster.
2.0.18 rinse water operation mode rinse water operation mode
After the rinse water passes through the pre-concentrator, it is sprayed into the production method of the roaster.
2.0.19 Demineralized water operation mode
A production method in which desalinated water is sprayed directly into the roaster.
3 Basic Regulations
3.0.1 The hydrochloric acid waste liquid regeneration project of the spray roasting method in iron and steel enterprises should be constructed simultaneously with the pickling unit.
3.0.2 The hydrochloric acid waste liquid regeneration engineering design shall adopt advanced, mature and reliable technology, process and equipment, and shall comply with the following regulations.
1 The design capacity should match the processing capacity of the pickling unit it serves;
2 The equipment level of process equipment and automatic control system should meet the requirements of production process;
3 Exhaust gas emission indicators should comply with the relevant provisions of the current national standard "Emission Standard of Air Pollutants for Steel Rolling Industry" GB 28665;
4 The quality of iron oxide powder should comply with the relevant provisions of the current national standard "Iron Oxide for Ferrite" GB/T 24244;
5 Neoacid should meet the relevant provisions of the current national standard "Industrial Synthetic Hydrochloric Acid" GB 320.
3.0.3 The hydrochloric acid regeneration device should be arranged in the station building.
3.0.4 The installation of the waste acid purification device in the hydrochloric acid regeneration project should be determined after technical and economic comparison according to the content of impurities such as silicon in the waste acid and the quality requirements of iron oxide powder.
3.0.5 The selection of equipment and materials in the hydrochloric acid regeneration station shall meet the working conditions and environmental requirements.
4 process design
4.1 Process parameters
4.1.1 The design annual working time of the hydrochloric acid regeneration unit should not be less than 6200h.
4.1.2 The material storage capacity in the hydrochloric acid regeneration station shall meet the requirements for continuous operation of the pickling unit and hydrochloric acid regeneration unit, and the storage time shall comply with the provisions in Table 4.1.2.
Table 4.1.2 Storage time of materials
4.1.3 The main components of the waste acid treated by the hydrochloric acid regeneration unit should meet the requirements in Table 4.1.3.
Table 4.1.3 Main components of spent acid
4.1.4 The processing capacity of the hydrochloric acid regeneration unit can be calculated according to the following formula.
In the formula. Qarp——processing capacity of hydrochloric acid regeneration unit (L/h);
Qpl——the processing capacity of the pickling unit (kg/a);
St - iron loss of pickling unit, 0.35% to 0.45%;
T——The annual working time of the hydrochloric acid regeneration unit (h);
CWA—concentration of iron ions in the waste acid discharged from the pickling unit (g/L);
CRW—concentration of iron ions in the rinsing water discharged from the pickling unit (g/L).
4.1.5 The design index of the hydrochloric acid regeneration unit should meet the following requirements.
1 Chloride ion (Cl-) recovery rate should be greater than or equal to 99%;
2 The circulating flow rate of the circulating pump of the pre-concentrator should be 8 to 10 times the processing capacity of the unit;
3 The circulating flow rate of the scrubber circulating pump should be 8 to 10 times the processing capacity of the unit.
4.1.6 When the hydrochloric acid regeneration unit is in operation, the following control indicators should be met.
1 The pressure at the top of the roasting furnace should be -0.15kPa ~ -0.45kPa;
2 The temperature at the top of the roasting furnace should be controlled at 385°C to 430°C;
3 The flue gas temperature at the outlet of the pre-concentrator should be less than 100°C.
4.2 Process configuration
4.2.1 The main equipment of the hydrochloric acid regeneration unit should include. roaster, pre-concentrator, absorption tower, scrubber, exhaust fan, droplet separator, iron oxide powder filter, acid storage tank, acid pump group, combustion system, oxidation Iron powder transportation and storage facilities.
4.2.2 The number of spent acid storage tanks and regenerated acid storage tanks should not be less than 2.
4.2.3 Filter settings should meet the following requirements.
1 The waste acid and rinsing water should be equipped with independent working filters before entering the pre-concentrator, and the spare filters can be shared, and the filtration accuracy should be less than or equal to 1mm;
2 The circulating pipeline of the pre-concentrator should be equipped with a filter;
3 A concentrated waste acid filter should be installed before the waste acid enters the acid gun.
4.2.4 When the chlorine ion (Cl-) content in the iron oxide powder is required to be less than or equal to 0.1%, a chlorine removal device should be installed.
4.2.5 Crusher and rotary valve should be installed at the bottom of the roaster. A high-temperature quick cut-off valve should be installed on the high-temperature flue gas outlet pipe of the roaster, and the closing time of the valve should be less than or equal to 8s.
4.2.6 The number of main burners and acid lances of the hydrochloric acid regeneration unit can be selected according to Table 4.2.6.Each main burner should be equipped with independent automatic controller and flame detection device.
Table 4.2.6 Number of main burners and number of acid guns
4.2.7 A quick cut-off valve should be installed on the gas main pipe, and the closing time of the valve should be less than 1s, with zero leakage. The number of quick cut-off valves on the main pipe should not be less than 2.
4.2.8 The feed pump of the roaster, the feed pump of the absorption tower, and the exhaust gas conveying fan should have the function of speed regulation.
4.2.9 Each set of acid regeneration unit should be equipped with independent iron oxide powder transportation and storage facilities. The type of iron oxide powder filter can be bag type or plate type.
4.2.10 Fixed dangerous gas leakage detection and alarm devices must be installed in the hydrochloric acid regeneration station.
4.2.11 The acid storage tank area, acid pump area and furnace top area must be equipped with safety spraying devices.
4.2.12 The following process parameters should be tested and have automatic interlocking function.
1 Roasting furnace top temperature and flue gas pressure, middle temperature;
2 Flue gas temperature at the outlet of the pre-concentrator;
3 Flue gas temperature at the outlet of the absorption tower.
4.2.13 The hydrochloric acid regeneration device shall switch between the following modes manually and automatically.
1 acid operation mode;
2 rinse water operation mode;
3 Desalinated operating mode.
4.2.14 The motor protection level of the hydrochloric acid regeneration device shall meet the following requirements.
1 The motor protection level of various fans and acid pumps should not be lower than IP54;
2 The motor protection level of various rotary valves should not be lower than IP63;
3 The protection level of all instruments and actuators should not be lower than IP65.
4.3 Process layout
4.3.1 The process layout of the hydrochloric acid regeneration unit should be safe and convenient for operation, maintenance and management.
4.3.2 The storage tank area shall be equipped with sump pits and automatic drainage facilities, as well as measures for collecting, storing and removing accumulated liquid. The liquid storage volume shall not be less than the volume of the largest storage tank.
4.3.3 The layout of station equipment shall meet the following requirements.
1 The equipment with operating noise greater than or equal to 80dB(A) should be arranged in a separate room;
2 All kinds of pump sets should be arranged in a centralized manner according to the situation;
3 The iron oxide powder packaging machine should be set up in a separate area;
4 The installation surfaces of pre-concentrators, absorption towers, scrubbers and other equipment, the roof platform of roasting furnaces, safety spraying devices and other areas should be equipped with floor drains and water retaining devices;
5 Each floor of the station building should be equipped with maintenance power supply.
4.3.4 The pipeline layout in the station building shall meet the following requirements.
1 Pipelines should be laid along walls, columns, pipe trenches, and pipe galleries, without hindering traffic, opening doors and windows, lighting, and easy maintenance;
2 The suction pipes of various acid pumps should be equipped with emptying pipes;
3 All kinds of overflow pipes should be equipped with water seal and ventilation facilities;
4 Storage tanks should be provided with air intake and exhaust facilities;
5 The pipeline layout should follow. the non-corrosive medium pipeline is above the corrosive medium pipeline, the gas pipeline is above the liquid pipeline, the metal pipeline is above the non-metal pipeline, and the insulation pipeline is above the non-heat insulation pipeline.
5 Process equipment and pipelines
5.1 General provisions
5.1.1 The equipment and materials of the hydrochloric acid regeneration unit shall be reliable, practical and durable, and shall meet the following requirements.
1 The lining acid-resistant bricks shall comply with the relevant provisions of the current national standard "Acid-resistant bricks" GB/T 8488;
2 Rubber-lined equipment shall comply with the relevant provisions of the current national standard "Rubber Lining" GB 18241.1, "Rubber Lining Chemical Equipment" HG/T 20677 and "Technical Regulations for Lining Steel Shell Design" HG/T 20678;
3 FRP equipment shall comply with the relevant provisions of the current industry standard "FRP Chemical Equipment Design" HG/T 20696;
4 PPH equipment should comply with the relevant provisions of the current national standard "Static Atmospheric Pressure Welded Thermoplastic Storage Tank (Tank)" GB/T 25197 and "Plastic Equipment" HG 20640;
5 Titanium alloy equipment should comply with the relevant provisions of the current national standard "Titanium and Titanium Alloy Grades and Chemical Composition" GB/T 3620.1 and "Titanium and Titanium Alloy Processed Products Chemical Composition Permissible Deviation" GB/T 3620.2;
6 Niobium materials and their processing shall comply with the relevant provisions of the current industry standard "Niobium and Niobium Alloy Processed Product Designation and Chemical Composition" YS/T 656.
5.1.2 Derusting and anticorrosion of steel structure equipment shall meet the following requirements.
1 The derusting of steel structure equipment before painting shall comply with the relevant provisions of the current national standard GB 8923 "Steel Surface Corrosion Grade and Rust Removal Grade Before Painting";
2 The coating of steel structure equipment shall comply with the relevant provisions of the current industry standard "Technical Regulations for Coating of Steel Structures and Pipelines" YB/T 9256;
3 Anti-acid paint should be used for external corrosion protection of steel structure equipment;
4 The external anti-corrosion of high-temperature steel structure equipment should be based on the highest design temperature of the surface, and the high-temperature-resistant paint of the corresponding temperature-resistant grade should be used.
5.1.3 The insulation of equipment and pipelines shall comply with the relevant provisions of the current national standard "Code for Construction of Industrial Equipment and Pipeline Thermal Insulation Engineering" GB 50126.
5.2 Equipment
5.2.1 The acid storage tank equipment shall meet the following requirements.
1 The acid storage tank should be made of carbon steel rubber lining or glass fiber reinforced plastic;
2 The carbon steel rubber-lined acid storage tank should be lined with heated vulcanized rubber, and the rubber sheet should be two layers, and the thickness of each layer should not be less than 3mm;
3 Carbon steel rubber-lined waste acid tanks and regenerated acid tanks should be built with acid-resistant bricks on the inner bottom and side walls of the storage tanks, and the thickness of the layers should not be less than 65mm;
4 The thickness of the anti-corrosion and anti-seepage inner layer of the FRP storage tank shall be greater than or equal to 4mm.
5.2.2 The material of the furnace shell of the roaster should be carbon steel, and the lining material should meet the following requirements.
1.The body and waist of the roasting furnace should adopt "series 1" acid-resistant refractory bricks, and the lower cone should adopt "series 2" acid-resistant refractory bricks;
2 The properties of acid-resistant refractory bricks, acid-resistant fireclay and lightweight castables shall meet the requirements in Table 5.2.2-1~5.2.2-3.
Table 5.2.2-1 Performance indicators of acid-resistant refractory bricks
Table 5.2.2-2 Performance Index of Acid Resistant Cement
Table 5.2.2-3 Performance indicators of lightweight castables
3 Corundum ramming material, high-alumina lightweight heat-insulating bricks and clay light-weight heat-insulating bricks should be used for the combustion chamber, and the material properties should meet the requirements in Table 5.2.2-4~5.2.2-6.
Table 5.2.2-4 Performance index of corundum ramming material
Table 5.2.2-5 Performance Index of High Alumina Lightweight Insulation Bricks
Table 5.2.2-6 Performance Index of Clay Lightweight Insulation Bricks
4 Acid-resistant castables should be used in the discharge port area of the furnace bottom, the connection between the burner and the furnace body, the connection between the double cyclone iron powder return pipe and the furnace body, and around the inspection door of the roaster. Material properties shall meet the requirements in Table 5.2.2-7.
Table 5.2.2-7 Performance indicators of acid-resistant castables
5.2.3 The pre-concentrator equipment should meet the following requirements.
1 The shell of the pre-concentrator should be made of carbon steel rubber-lined material, the parts above the throat should be lined with acid-resistant and heat-resistant bricks made of water glass cement, and the parts below the throat should be lined with furan cement-lined acid-resistant bricks;
2 The material of the pre-concentrator nozzle should be niobium or titanium alloy;
3 The material at the throat of the pre-concentrator should have the characteristics of high temperature resistance, acid resistance and severe erosion resistance.
5.2.4 Absorption towers, scrubbers, droplet separators, chimney equipment and packing shall meet the following requirements.
1 The absorption tower can be made of steel-lined rubber, glass fiber reinforced plastic, PPH (modified polypropylene) and other materials;
2 Droplet separators, scrubbers, and chimney equipment can be made of glass fiber reinforced plastics and PPH;
3 The packing in the absorption tower and scrubber should be structured packing and Pall ring packing, and its material should be PPH, PVDF (polyvinylidene fluoride).
5.2.5 The exhaust fan shall meet the following requirements.
1 The shell should be made of carbon steel rubber lining, titanium alloy and other materials;
2 The impeller should be made of titanium alloy, and the impeller flushing device should be installed;
3 Vibration detection and shaft temperature detection devices should be installed.
5.2.6 The iron oxide powder filter shall meet the following requirements.
1 The temperature resistance of filter parts should not be lower than 105°C;
2 The internal structural parts shall be made of materials resistant to hydrogen chloride corrosion.
5.2.7 Acid-resistant pumps shall meet the following requirements.
1.PVDF, FRP, silicon carbide and other materials should be used for the circulating pump of the pre-concentrator and the flow-through parts of the feed pump of the roaster;
2 The mechanical seals of the circulating pump of the pre-concentrator and the feeding pump of the roaster should be equipped with flushing water.
5.2.8 Acid guns and nozzles shall meet the following requirements.
1 The acid gun should be made of niobium or titanium alloy, and the nozzle can be made of ceramic, silicon carbide and other materials;
2 A filter should be built into the acid gun, and the filter screen should be made of PVDF.
5.2.9 Filters should meet the following requirements.
1 The shell of waste acid filter, rinsing water filter and circulating acid filter should be made of PPH, steel-lined rubber, glass fiber reinforced plastic and other materials, the filter element should be made of PPH, glass fiber reinforced plastic and other materials, and the filter screen should be made of PPH material;
2 The casing of the concentrated acid filter can be made of steel-lined rubber or titanium alloy, the filter element should be made of titanium alloy or PVDF, and the filter screen should be made of PVDF.
5.3 Pipeline
5.3.1 The pipe material in the acid regeneration station shall meet the following requirements.
1 Media pipelines such as waste acid, regenerated acid, rinsing water, new acid, and desalinated water, as well as vent pipes and sewage pipes of acid tanks should be made of PPH, glass fiber reinforced plastics and other materials;
2 The circulating pipes and fittings of the pre-concentrator should be made of PVDF;
3 The acid supply pipes and pipe fittings of the roaster should be made of steel-lined PVDF, PVDF and other materials;
4 The flue gas pipe with a temperature higher than 380°C should be made of carbon steel, and the flue gas pipe with a temperature lower than 100°C should be made of PPH and glass fiber reinforced plastics;
5 Gas pipes, nitrogen pipes, compressed air pipes, and production fire-fighting water pipes should be made of carbon steel;
6 Carbon steel pipes should be used for iron oxide powder transportation pipelines, and the elbows should be lined with wear-resistant materials.
5.3.2 The pipe from the double-cyclone dust collector to the pre-concentrator should be equipped with a high-temperature-resistant expansion device; the flue gas pipe from the outlet of the pre-concentrator to the chimney section should use a rubber expansion device.
5.3.3 Non-metallic pipelines shall meet the following requirements.
1 PPH pipes larger than DN500 should be manufactured by extrusion winding process;
2 The natural compensation method should be adopted for pipeline heat compensation, and compensators should be installed where necessary, and corrugated expansion joints should not be installed for concentrated acid medium pipelines;
3 Pipeline layout should reserve space for pipeline maintenance.
5.4 Insulation
5.4.1 Insulation measures should be taken for roasting furnace, double cyclone dust collector, chlorine removal device, piping between roasting furnace and pre-concentrator, etc.
5.4.2 Fiber blanket should be used as insulation material for the top of the roaster and the burner of the dechlorination device, and rock wool can be used for other parts.
5.4.3 The thickness of the equipment insulation material should meet the requirement that the temperature of the outer surface of the insulation layer should not be higher than 60°C.
5.4.4 Color plate, galvanized steel plate, etc. can be used for the outer protective layer of thermal insulation material, and the thickness should not be less than 0.4mm.
6 Electrical automation
6.1 Low voltage power supply and distribution
6.1.1 The power load of the equipment in the hydrochloric acid regeneration station should be designed according to the three-level load, and the low-voltage power supply and distribution system should meet the requirements of this load level.
6.1.2 The low-voltage power supply and distribution system should adopt radial power supply mode. The design of the low-voltage power supply and distribution system shall comply with the relevant provisions of the current national standard "Code for Design of Low-Voltage Power Distribution" GB 50054.
6.1.3 The automatic control system, testing instruments, and electrical equipment for communication facilities shall use UPS power supply as emergency power supply, and the emergency time shall not be less than 15 minutes.
6.1.4 Special power supply should be used for lighting and maintenance power supply in hydrochloric acid regeneration station.
6.2 Electric drive
6.2.1 The electric drive system should adopt full AC drive mode.
6.2.2 Speed-regulating motors should be powered by full-digital AC frequency conversion speed-regulating equipment, constant-speed motors should be powered by motor control centers, and constant-speed motors with larger capacity should use soft starters.
6.2.3 The panel of the operation box in the hydrochloric acid regeneration station should be made of materials resistant to hydrochloric acid corrosion.
6.2.4 The degree of protection of on-site electrical equipment should not be less than IP54.
6.2.5 An independent electrical room should be set up in the hydrochloric acid regeneration area.
6.2.6 The cable laying should adopt the cable tray as the main method and partial pipe penetration. Anti-corrosion area bridges should use fiberglass and other anti-corrosion bridges, and pipes should use PVC (polyvinyl chloride) and other non-metallic pipes.
6.2.7 The cable design should comply with the relevant provisions of the current national standard "Code for Design of Electric Power Engineering Cables" GB 50217.
6.2.8 The lighting design shall comply with the relevant provisions of the current national standard "Architectural Lighting Design Standard" GB 50034.Emergency lighting should be installed in electrical rooms, operating rooms and other rooms, and the emergency lighting time should not be less than 30 minutes.
6.2.9 The lightning protection design shall comply with the relevant provisions of the current national standard "Code for Lightning Protection Design of Buildings" GB 50057.
6.2.10 The grounding design shall comply with the relevant provisions of the current national standard "Type and Safety Technical Requirements for System Grounding" GB 14050.
6.3 Process detection and control instruments
6.3.1 The setting of process inspection and control items shall comply with the provisions in Table 6.3.1.
Table 6.3.1 Requirements for setting process inspection and control items
6.3.2 The temperature detection instrument shall meet the following requirements.
1 The thermal resistance should use the graduation number Pt100, and the thermocouple should choose the graduation number K, S, B according to the temperature measurement range;
2 The material of the temperature measuring element protection tube should be selected according to the characteristics of the measured medium.
6.3.3 For highly corrosive acidic media, the parts of pressure gauges in contact with the media should be made of acid-resistant materials, and the process connection should be flanged.
6.3.4 The throttling device shall meet the following requirements.
1 Throttle devices should be used for flow detection of gas and combustion-supporting air;
2 For gas flow measurement with large temperature and pressure fluctuations, temperature and pressure compensation should be carried out.
6.3.5 The electromagnetic flowmeter shall meet the following requirements.
1 For flow measurement of conductive liquid medium, electromagnetic flowmeter should be used;
2 When the measured medium contains magnetic or magnetizable substances, electromagnetic flowmeters should not be used;
3 For alkaline medium, the electrode material should be stainless steel; for strong corrosive acidic medium, the electrode material should be platinum metal; the lining material should be PTFE (polytetrafluoroethylene);
4 In places with insufficient maintenance space or places with large vibrations, split electromagnetic flowmeters should be used.
6.3.6 The level instrument shall meet the following requirements.
1 For liquid media whose density is prone to obvious changes under normal working conditions, when using static pressure or differential pressure liquid level gauges, there should be a density compensation scheme suitable for the working conditions;
2 For measuring media containing magnetic or easily magnetizable substances, it is not appropriate to use magnetic flaps or magnetic float level gauges;
3 Corrosion-resistant non-contact liquid level gauges should be used for liquid level measurement of highly corrosive media and easily crystallized media.
6.3.7 Analytical instruments should meet the following requirements.
1 The oxygen content analyzer in the flue gas of the roaster should be installed in-line;
2 The on-line density analyzer of regenerated acid should adopt vibrating density meter.
6.3.8 Control valves should meet the following requirements.
1 The valve position of the control valve in the accident state shall be in the safe position;
2 Control valves that affect safety and are not equipped with bypass valves should be equipped with handwheels;
3 The gas flow regulating valve of the burner of the roaster should have a cut-off function.
6.3.9 The power supply of the instrument system shall be three-phase 380V or single-phase 220V AC power supply.
6.3.10 The instrument air source shall meet the following requirements.
1 Purified compressed air should be used;
2 The normal air supply pressure should be 0.4MPa～0.6M...
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