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GB/T 36699-2018 PDF English


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GB/T 36699-2018: PDF in English (GBT 36699-2018)

GB/T 36699-2018 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 27.060.30 J 98 Specification for liquid-fuels and gaseous-fuels burners of boilers ISSUED ON. SEPTEMBER 17, 2018 IMPLEMENTED ON. APRIL 01, 2019 Issued by. State Administration for Market Regulation; Standardization Administration of PRC. Table of Contents Foreword ... 4  Introduction ... 5  1 Scope ... 6  2 Normative references ... 6  3 Terms and definitions ... 8  4 Classification and preparation of model ... 13  5 Composition and basic configuration ... 15  6 Basic requirements ... 19  7 Performance requirements ... 20  8 Design and manufacturing ... 29  9 Special requirements ... 36  10 Inspection, testing and detection ... 38  11 Technical documents and markings ... 41  12 Packaging, transportation and storage ... 42  13 Installation, commissioning and use ... 43  Appendix A (Normative) Basic configuration of burner ... 47  Appendix B (Normative) Requirements for arrangement of safety shut-off valve of liquid-fuel burner ... 53  Appendix C (Normative) Opening requirements of safety shut-off valve of main gas ... 59  Appendix D (Normative) Measurement and correction of emissions ... 63  Appendix E (Informative) Measurement of flue-gas’s blackness ... 67  Appendix F (Normative) Control timing diagram of liquid-fuel and gaseous-fuel burner ... 69  Appendix G (Normative) Conditions of type test ... 70  Appendix H (Normative) Type test, exit-factory inspection, post-modification inspection, in-use detection items ... 80  Appendix I (Normative) Type test, exit-factory inspection, in-use test method ... 81  Specification for liquid-fuels and gaseous-fuels burners of boilers 1 Scope This standard specifies the technical requirements for the classification and model preparation, composition and basic configuration, basic requirements, performance requirements, design and manufacture, inspection, testing and detection, technical documentation and identification, packaging, transportation and storage, installation, commissioning, use of liquid-fuels and gaseous-fuels burners of boilers. This standard applies to forced draught burners and natural ventilation burners which use the liquid-fuels and gaseous-fuels for boilers. Power plant boiler’s startup burners, various industrial furnaces, industrial heating furnaces, burners for other purposes may make reference to this standard. 2 Normative references The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this standard. GB/T 1184 Geometrical tolerancing - Geometrical tolerance for features without individual tolerance indications GB/T 1804 General tolerances - Tolerances for linear and angular dimensions without individual tolerance indications GB/T 4208 Degrees of protection provided by enclosure (IP code) GB/T 6414 Castings - Dimensional tolerances and geometrical tolerances and machining allowances GB/T 13384 General specifications for packing of mechanical and electrical product GB/T 13611 Classification and essential property of city gas GB/T 14486-2008 Dimensional tolerances for molded plastic parts GB/T 14536.1 Automatic electrical controls for household and similar use - Part 1. General requirements GB/T 14536.6 Automatic electrical controls for household and similar use - Particular requirements for automatic control systems for burners GB/T 14536.7 Automatic electrical controls for household and similar use - Special requirements for pressure-sensitive electrical automatic controllers, including mechanical requirements GB 16663 Alcohol base liquid-fuel GB 18613 Minimum allowable values of energy efficiency and energy efficiency grades for small and medium three-phase asynchronous motors GB/T 19212.4 Safety of transformers, reactors, power supply units and combinations thereof - Part 4. Particular requirements and tests for gas and oil burners, ignition transformers GB 19517 National safety technical code for electric equipments GB/T 19804 Welding - General tolerances for welded constructions - Dimensions for lengths and angles - Shape and position GB/T 24146 Rubber hoses and hose assemblies for use in oil burners - Specification GB 25989 Fuel oils for burners GB/T 30597 General requirements of safety and control devices for gas burners and gas-burning appliances JB/T 10562 Technical specification for general purposes axial fans JB/T 10563 Technical specification for general purposes centrifugal fans TSG G0001 Boiler safety technical supervision administration regulation ISO 23551-1 Safety and control devices for gas burners and gas-burning applications - Particular requirements - Part 1. Automatic and semi- automatic valves ISO 23551-2 Safety and control devices for gas burners and gas-burning appliances - Particular requirements - Part 2. Pressure regulators ISO 23551-3 Safety and control devices for gas burners and gas-burning appliances - Particular requirements - Part 3. Gas/air ratio controls, pneumatic type Gaseous-fuel A gaseous combustible substance that generates heat when burned. Note. The gaseous-fuels referred to in this standard include natural gas, liquefied petroleum gas, coke-oven gas, mixed city gas, bio-gas, low- calorific-value gas, combustible industrial tail-gas, hydrogen gas, methane. 3.6 Biomass pyrolysis gas A low-calorific-value combustible gas produced by a pyrolysis process of a biomass solid fuel. 3.7 Dual fuel burner A burner capable of burning liquid and/or gaseous-fuel simultaneously or separately. 3.8 Surface burner A fully-premixed burner in which fuel is burned on the surface of a porous medium. 3.9 Heat output The amount of heat as released by the burner per unit time. Note. The heat output referred to in this standard is based on the net calorific value of the fuel, in the unit of kilowatt (kW). 3.10 Nominal heat output The heat as released by the burner during continuous combustion per unit time under rated conditions. Note. The nominal heat output is expressed in QF, in kilowatts (kW). 3.11 Maximum heat output Flame detector device A device for monitoring the presence of a flame. 3.19 Main flame A flame that burns on the main combustion nozzle. 3.20 Ignition flame The flame that is first ignited to ignite the main flame. 3.21 Controlled shutdown When the burner does not need to supply heat, the process of shut-down by automatically cutting off the fuel supply. 3.22 Safety shutdown After the safety device responds or the automatic control system fails, the process of shut-down by automatically cutting off the fuel supply. 3.23 Pre-ignition time The time interval between the startup of discharge of the ignition electrode and the opening of the fuel valve. Note. The pre-ignition time is expressed in ty, in seconds (s). 3.24 Ignition safety time The safe time for the burner’s ignition flame to ignite, that is, when the ignition flame is not formed, the interval between the time when the ignition fuel control valve gets the opening signal and the time when it gets the closing signal. Note. The ignition safety time is expressed in ts, in seconds (s). The ratio of the actual amount of supplied air to the amount of theoretical air. 3.31 Working diagram A curve which represents the relationship between the combustion chamber’s pressure and the heat output, whose enveloped zone is the working range as designed for the burner. 3.32 Original emission Emission concentration of combustion products without any treatment determined under type test conditions. Note. The original emission concentration is converted according to the oxygen content of the flue-gas of 3.5%, in milligrams per cubic meter (mg/m3). 3.33 In service burner modification The behavior of making major changes to the type of fuel, internal structure, combustion method of the burner. 4 Classification and preparation of model 4.1 Classification The burners are divided according to the type of fuel used, the mode of adjustment, the mode of air supply, the method of atomization, the type of structure, as follows. a) According to the type of fuel used, it is divided into liquid-fuel burners, gaseous-fuel burners, dual (multi) fuel burners; b) According to the heat output’s control mode, it is divided into single-stage control burner, multi-stage control burner, modulating control burner; c) According to the air supply mode of combustion air, it is divided into forced draught burners and natural ventilation burners; d) According to the atomization mode of the liquid-fuel, the liquid-fuel burner is divided into mechanical-atomization burner and medium-atomization burner; a) A single-stage control burner shall be provided with one safety shut-off valve, as shown in Figure B.1; b) A two and multi-stage control burner shall be provided with a safety shut- off valve for each nozzle, as shown in Figure B.2; c) The burner which uses the return nozzle shall be provided with a safety shut-off valve on the fuel supply pipeline and the fuel return pipeline, which are linked. It may use a nozzle shut-off valve to replace the safety shut-off valve, as shown in Figure B.3 and Figure B.4. 5.2.2.2 For liquid-fuel burners which have a nominal heat output > 400 kW, it shall install two automatic safety shut-off valves in serial connection on the fuel pipeline. The upstream safety shut-off valve shall be of the quick-closing type, the downstream safety shut-off valve may also be used as the flow control valve simultaneously. The closing time shall not exceed 5 s. The automatic safety shut-off valve shall be arranged in accordance with the requirements of Figure B.5 ~ Figure B.7. The specific requirements are as follows. a) The two and multi-stage control burners shall be equipped with two safety shut-off valves for each nozzle, as shown in Figure B.5; b) Burners which use return nozzles shall be fitted with two safety shut-off valves, respectively, on the fuel supply pipeline and the fuel return pipeline. One of the safety shut-off valves may be replaced by a nozzle shut-off valve, which shall comply with the requirements of ISO 23553-1. The return pipeline shall be fitted with a pressure monitoring device, as shown in Figure B.6 and Figure B.7. The safety shut-off valve shall be linked. When the safety shut-off valve on the fuel supply pipeline is opened, the safety shut-off valve on the return pipeline cannot be closed. It can be realized by the following two methods. 1) A mechanical connection controlled by the actuator between the safety cut-off valve on the supply pipeline and the safety shut-off valve on the return pipeline; 2) An electrical or pneumatic interlocking between the safety cut-off valve on the supply pipeline and the safety shut-off valve on the return pipeline. If the burner has a circulating preheating nozzle head, it shall make the fuel circulate to the nozzle head. When there is only one nozzle shut-off valve, the nozzle shut-off valve shall meet the requirements of ISO 23553-1, otherwise it shall take other measures to ensure that the fuel does not ejected during circulated heating. At the same time, it shall also ensure that the return pressure will not open the nozzle shut-off valve. 5.2.3 Automatic safety shut-off valve for gaseous-fuel A gas leak detector which has a nominal heat output greater than 1200 kW shall be provided with a valve leak detector. 6 Basic requirements 6.1 Declaration of conformity This standard has been developed in accordance with the basic safety requirements for the liquid-fuel burner and the gaseous-fuel burner in TSG G0001. 6.2 Manufacturing organization The manufacturing organization of the burner shall meet the following conditions simultaneously. a) The production equipment and production sites that are compatible with the scale of production; b) The basic test and detecting device of the burner; c) The technicians and professional commissioning personnel related to the thermal energy and electrical control trades; d) The sound quality management system and corresponding management policies. 6.3 Professionals Professionals involved in such trades as manufacture, installation, commissioning, repair, modification of burners shall have expertise in thermal energy and electrical control, be familiar with the operation and commissioning process. 6.4 Type test 6.4.1 Burners shall be subjected to the type test under one of the following conditions. a) A newly-designed burner; b) Where the fuel types used by the burner or the structure and programmable control methods of burner change; c) The last type test of the burner is more than 4 years. 6.4.2 The type test shall be carried out by an inspection and testing institute which has the type test qualification of burner as approved by the State Special 7.1.6 Ignition of ignition burner 7.1.6.1 The ignition of the liquid-fuel shall meet the following requirements. a) When the ignition burner is spark-ignited, if the interval between the time when the fuel cut-off valve of the ignition burner is opened and the time when the fuel cut-off valve of the main burner exceeds 5 s, it shall monitor the ignition flame; b) When the flame of the liquid-fuel is not ignited, if the main fuel supply can be cut off during the safety time and the ignition valve can be closed at same time, it is not necessary to separately monitor the ignition flame during the pre-ignition time of 5 s, in which case the ignition fuel can be supplied for up to 10 s (5 s is the pre-ignition time, 5 s is the safety time). 7.1.6.2 The ignition of gaseous-fuel shall meet the following requirements. a) Except for valve leak detection, the ignition gas valve shall not be energized before the spark ignition device or other ignition device is energized; b) For burners which has a heat output greater than or equal to 120 kW, the ignition gas is drawn from between the two main gas safety shut-off valves. Before startup, the downstream main gas safety shut-off valve shall not be energized; c) When the ignition gas is controlled by the position of the downstream main gas safety shut-off valve, it shall install a pressure control device to make the ignition gas amount meet the requirements of this standard, meanwhile the gas-pressure shall be greater than the system’s resistance; d) In the event of an ignition flame’s failure, the system shall behave as specified in 7.1.8. 7.1.7 Startup of main burner 7.1.7.1 Direct startup When igniting the main flame directly, it shall comply with the following requirements. a) When using spark ignition, the ignition source shall not be energized before the end of the purge, and it shall be de-energized before the end of the safety time; b) When using a hot-surface ignition device, the ignition device shall be energized first, the main gas valve can be opened after the temperature of the ignition source reaches the ignition temperature of the gas. 7.1.9.2 Safety shutdown During startup or operation, the burner shall be safely shut-down in any of the following situations. a) The power supply or dynamic gas source is interrupted or abnormal; b) The gas-pressure is lower than the set value; c) Liquid-fuel burners exhibit atomization medium failure, low fuel pressure, low fuel temperature, high return pressure of burner which has return nozzle, low rotor speed when using rotary atomizer, etc. 7.1.9.3 Interlock protection During startup and operation, it shall be safely shut-down and interlock- protected in any of the following conditions (except as listed in 7.1.8). a) Fault signal of flame; b) High-voltage protection signal of gas; c) Fault signal of air-flow; d) Abnormal position verification for a burner with position verification; e) Alarm signal of gas valve leak detection; f) Temperature overrun signal of liquid-fuel; g) Overrun of such parameters as pressure, water-level, temperature as related to the boiler. 7.2 Electrical safety 7.2.1 Electrical equipment’s safety shall meet the requirements of GB 19517, the electrical safety shall be implemented in the order of direct safety measures, indirect safety measures, suggestive safety measures. 7.2.2 In order to ensure the normal operation and prevent the danger caused by the direct action of the current, the electrical equipment shall have sufficient insulation resistance, dielectric strength, heat resistance, moisture resistance, anti-fouling, flame retardancy, tracking resistance. 7.2.3 All parts that may be hazardous due to operating voltage, fault current, leakage current or the like shall have sufficient electric clearance and creepage distance. 7.2.4 Electrical equipment shall have sufficient mechanical strength, good a) The flame diameter and length of the burner shall be matched to the furnace size of the boiler; b) The nominal heat output of the burner shall be matched to the rated output of the boiler; c) It should use the online oxygen monitoring, to improve the control accuracy of air-fuel ratio. 8 Design and manufacturing 8.1 General requirements The burner shall be designed to meet the following requirements. a) The materials used in each component shall be capable of withstanding the mechanical load, thermal, chemical load in the working environment; b) The design of each component structure shall ensure the safe and economic operation of the burner, without any occurrence of instability, deformation or cracking; c) For the burner which has a flame observation hole, the structure design of the flame observation hole’s fitting shall have sufficient strength and reliable sealing; d) The components exposed to corrosive fuels shall be corrosion resistant; e) The burners used in cold environments shall take the necessary antifreeze measures; f) When burning explosive gaseous-fuels, all electrical components shall be installed in accordance with the provisions of the hazard zoning of relevant equipment, with corresponding explosion-proof grades; g) The burner and fuel pipelines shall be provided with the measuring-points for fuel supply pressure, fuel control pressure, fuel pressure at the burner’s head, air pressure. 8.2 Connection and sealing The connection between the burner’s components and between the burner and the boiler shall comply with the following requirements. a) The burner shall be securely fixed to the boiler. It shall provide a sealing gasket with thermal insulation function between the burner and the boiler; b) Components which require regular maintenance shall be easy to c) The parameter setting of the air monitoring device shall be matched to the minimum heat output. The limit of volume content of carbon monoxide in the combustion products shall not exceed 1%. 8.3.4 Air-flow control device The air-flow control device shall meet the following requirements. a) The burner shall be fitted with a damper adjustment device or similar device for regulating the air-flow, and the position of the damper shall be clearly marked; b) The manual air-flow control device shall have fixed measures to prevent mis-operation; c) The air-volume at the same operating point during the upward and downward movement of the control device shall be repeatable. 8.3.5 Fuel-flow control device The fuel-flow control device shall be able to accurately adjust within the design pressure range, the fuel-flow is stable and reliable. At the same operating point during the upward and downward movement of the control device, the fuel-flow shall be repeatable. 8.3.6 Control device of air/fuel ratio The control device of air/fuel ratio shall comply with the relevant requirements of ISO 23551-3 and ISO 23552-1 and shall meet the following requirements. a) The air-flow and fuel-flow shall be linkage-controlled, meanwhile it shall ensure that the operating point of the burner is repeatable; b) If using a dual-servo control system, it shall monitor in a real-time manner the position of the fuel-flow regulating valve and the air-flow regulating valve; c) For two and multi-stage control burners, it shall first increase the air- volume before increasing load; it shall first reduce fuel before reducing load; d) At the ignition of burner, it shall verify the fuel and air ignition positions. The setting of ignition setting shall comply with the requirements of start heat output in 7.1.5; e) The air/fuel ratio control device may, in case of failure, still receive the control signals, to ensure that the system supplies sufficient air or a safety shutdown. 8.3.10.1 For the burners which burn the high-viscosity liquid-fuel, the fuel shall be preheated. 8.3.10.2 The heat source for liquid-fuel preheating shall meet the following requirements. a) The heat output shall be automatically controlled and shall be cut off immediately as needed; b) It shall not be heated by an open flame. 8.3.10.3 The preheating temperature of liquid-fuels shall meet the following requirements. a) Under normal pressure, the maximum preheating temperature of liquid- fuel shall be lower than its opening ignition point, meanwhile it shall not exceed 90 °C; b) The maximum preheating temperature of the pressurized preheater shall be at least 5 °C lower than the saturation temperature of the water at the corresponding pressure. 8.3.11 Automatic safety shut-off valve of gaseous-fuel The automatic safety shut-off valve of gaseous-fuel shall comply with the relevant requirements of ISO 23551-1 and ISO 23551-4 and shall meet the following requirements. a) The automatic safety shut-off valve is a normally-closed valve, which shall be quickly and automatically closed when the driving force is lost; b) If the nominal diameter of the valve is less than or equal to 200 mm, the valve shall be safely closed within a period of not more than 1 s; if the nominal diameter of the valve is more than 200 mm but less than or equal to 300 mm, the valve shall be safely closed within 3 s; if the nominal diameter of the valve is more than 300 mm, the valve shall be safely closed within 5 s. 8.3.12 Valve leak detector The valve leak detector shall comply with the relevant requirements of ISO 23551-4 and ensure that the opening time of the downstream valve of the two series-connected gas valves during the leak detection process does not exceed 3 s. Valve leak detection shall be performed during or before the pre-purge. 8.3.13 Low-pressure protection device of gas The low-pressure protection device of gas shall comply with the relevant indicated positional tolerance shall be in accordance with the relevant provisions of GB/T 1184. It shall meet the following requirements. a) The injection-molded parts shall not have obviously-visible surface defects such as flow marks, fusion marks, pores, delamination, carbonization scorch; b) The injection-molded parts shall be full and shall not have defects such as depressions, cracks, warpage, flashing; c) The appearance of the injection-molded parts shall not have any shrinkage marks that affect the appearance; d) The structural dimensions shall comply with the requirements of the technical drawings or the retained sample. 8.4.4 Machined parts The dimensional tolerances of machined parts shall comply with the relevant levels in GB/T 1804. 8.4.5 Castings The dimensional tolerance of castings shall comply with the relevant provisions of GB/T 6414 and shall meet the following requirements. a) The casting shall not have cracks. The casting sand, core sand, pouring gate, riser, package bump, scale, slag inclusion on the surface of the casting shall all be removed. b) The machined surface of the castings which have sealing requirements shall be free from defects such as pinholes, blisters or slag inclusions. The diameter of defects such as pinholes, blisters or slag inclusions on other surfaces shall be less than or equal to 3 mm, the depth shall be less than or equal to 10% of the thickness and less than or equal to 3 mm. The number of defects shall be less than or equal to 2 on the surface of 100 cm2. The spacing between defects shall be more than or equal to 20 mm. The total number of defects for a single casting shall be less than or equal to 10. c) Except as indicated in the design document, all corners on the casting shall be rounded, where the inner radius of the fillet shall be more than or equal to 6 mm, the outer radius of the fillet shall be more than or equal to 4 mm. There shall be no acute angle and sharp transition on the casting. d) The castings shall be subjected to heat-treatment to eliminate residual stress. When the castings need to be machined, the heat-treatment shall be carried out before machining. requirements in Table 12. Meanwhile it shall prevent the generation of pollutants such as aldehydes. 9.2 Biomass pyrolysis gas burner In addition to meeting the general requirements for gaseous-fuel burners, the design of biomass pyrolysis gas burners shall also meet the following additional requirements. a) Set up a reliable ignition burner to ignite by high calorific value fuel such as light oil, natural gas or liquefied petroleum gas; b) In terms of structural design, it shall provide a tar cleaning port. 9.3 Surface burner 9.3.1 Design requirements In addition to complying with the general requirements for gaseous-fuel burners, surface burners shall also meet the following requirements. a) The premixing stage shall ensure that the gas and air are evenly mixed. The premixing stage shall strictly ensure the airtightness and prevent the premixed gas from leaking. b) When the nominal heat output is more than 2100 kW, the premixing stage shall be located at the outlet of the fan. When the premixing stage is located at the inlet of the fan, the fan shall be an explosion-proof fan. c) It shall provide gas and air-filtration devices. The pores of the filtration device shall not be larger than the pores of the burner head, to ensure the safe operation. d) It shall provide a negative-pressure monitoring device, flow monitoring device, or other devices which may reflect the actual air-supply status in a real-time manner at the outlet of the air filter. The filter shall be interlocked and protected when it is blocked. e) It shall provide the anti-backfire monitoring devices inside the flame tube, such as temperature monitoring, light monitoring, ion monitoring, etc. If the anti-backfire monitoring device detects a signal, it shall be able to cut off the fuel supply immediately. f) The post-pur...... ......
 
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