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DL/T 1115-2019: Directive of chemistry check-up for unit maintenance in fossil plant
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Directive of chemistry check-up for unit maintenance in fossil plant
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DL/T 1115-2019
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Guide for chemistry check-up of unit maintenance in fossil fuel power plant
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Basic data | Standard ID | DL/T 1115-2019 (DL/T1115-2019) | | Description (Translated English) | Directive of chemistry check-up for unit maintenance in fossil plant | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | F23 | | Classification of International Standard | 27.100 | | Word Count Estimation | 28,220 | | Date of Issue | 2019 | | Date of Implementation | 2019-10-01 | | Issuing agency(ies) | National Energy Administration | DL/T 1115-2019: Directive of chemistry check-up for unit maintenance in fossil plant---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Directive of chemistry check-up for unit maintenance in fossil plant
ICS 27.101
F 23
People's Republic of China Electric Power Industry Standard
Replace DL/T 1115-2009
Guidelines for Chemical Inspection of Thermal Power Plant Unit Overhaul
Refractory materials for boilers in thermal power plants
2019-06-04 released
2019-10-01 implementation
Issued by National Energy Administration
Table of contents
Foreword...II
1 Scope...1
2 Normative references...1
3 General...1
4 Inspection preparation...1
5 Boiler equipment inspection...2
6 Steam Turbine Inspection...4
7 Condenser inspection...4
8 Other equipment inspection...5
9 Inspection and Evaluation Criteria...7
Appendix A (informative appendix) The basic content of the chemical inspection report of the unit overhaul...9
Appendix B (Informative Appendix) Chemical Inspection Record Form for Unit Overhaul...12
Appendix C (Normative Appendix) Measurement method of scale amount and oxide scale thickness...23
Appendix D (Normative Appendix) Corrosion Pit Area, Depth and Corrosion Points per Unit Area Measurement Method...24
Appendix E (Normative Appendix) Scrape samples and chemical composition analysis methods...26
Appendix F (Normative Appendix) Methods for measuring the amount of salt and fouling in steam turbines...27
Appendix G (Normative Appendix) Methods for rapid and qualitative detection of copper...28
Foreword
This standard is based on the rules set out in GB/T 1.1-2009 "The Structure and Compilation of Standardization Guidelines Part One"
set.
This standard is a revision of DL/T 1115-2009 "Guidelines for Chemical Inspection of Thermal Power Plant Unit Overhaul", which is in line with DL/T 1115-2009
In comparison, the main differences in technical content are.
--- Added normative reference documents.
--Modified the general rules.
--Modified the inspection content and method of boiler equipment.
--Added the inspection content and method of the combined cycle unit waste heat boiler.
--Modified the inspection content and method of steam turbine.
--Increase the inspection content and method of direct air condenser.
--Increase the inspection content and method of the indirect air-cooled circulating water system.
--Added the inspection contents and methods of other equipment.
-Part of the contents of Appendix A, Appendix B, Appendix C, Appendix E and Appendix F have been revised.
Appendix A and Appendix B of this standard are informative appendices, and Appendix C, Appendix D, Appendix E, Appendix F, and Appendix G are normative
appendix.
This standard was proposed by the China Electricity Council.
This standard is under the jurisdiction and interpretation of the Power Plant Chemical Standardization Technical Committee.
Drafting organizations of this standard. Xi'an Thermal Power Research Institute Co., Ltd., China Power Huachuang Power Technology Research Co., Ltd., Huadian Electric Power Division
Research Institute Co., Ltd., Ningxia Power Energy Technology Co., Ltd., Beijing Energy Group Co., Ltd.
The main drafters of this standard. Huang Wanqi Long Guojun Zhou Chen Deng Yuqiang Zhang Hongbo Wu Yang Guan Huiyao Tang Ziqiang Hu Zhenhuaheng
Shiquan Chen Jianwei.
This standard was first issued in.2009, and this is the first revision.
Opinions or suggestions during the implementation of this standard will be fed back to the Standardization Center of China Electricity Council (Xuanwu District, Beijing)
No. 1, Ertiao Guanglu, 100761).
Guidelines for Chemical Inspection of Thermal Power Plant Unit Overhaul
1 Scope
This standard specifies the content, methods and evaluation criteria of the chemical inspection for the overhaul of thermal power plant units.
This standard is applicable to the chemical inspection of the equipment during the overhaul (ie Class A overhaul) of thermal power plant units. Other levels
For maintenance, refer to the implementation.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version is suitable
Used in this document. For undated references, the latest version (including all amendments) applies to this document.
GB 26164.1 Electrical Safety Work Regulations Part 1.Heat and Machinery
DL/T 794 Guidelines for chemical cleaning of boilers in thermal power plants
DL/T 1151 Analysis method of scale and corrosion products in thermal power plants
3 General
3.1 The purpose of chemical inspection is to grasp the corrosion, scaling or salt accumulation of power generation equipment, establish equipment status files; evaluate the unit
Whether the feed water and boiler water treatment methods adopted during operation are reasonable, and whether the monitoring is effective; evaluate the unit in infrastructure and shutdown (standby)
Whether the anti-corrosion method adopted during use is appropriate; analyze the problems found in the inspection or the problems that may be expected to occur,
Put forward improvement measures and suggestions.
3.2 Before the unit is overhauled, the chemistry major should formulate a detailed inspection plan and put forward chemical-related inspection items and requirements. machine
During the inspection and repair of the team, the production management department and relevant personnel in the steam turbine, boiler, and electrical fields should cooperate with each other in accordance with the chemical inspection items.
Learn professionally for inspection.
3.3 When overhauling the units A and B, the heating surface of the boiler, such as the economizer, water wall, superheater and reheater, should be inspected by pipe cutting;
During the last level C overhaul before the level A overhaul, the heating surface of the boiler should be cut and inspected. Other levels of maintenance can be rooted
According to the actual situation, determine whether to cut the pipe for inspection.
3.4 Steam turbines and boilers shall cut or draw pipes according to the specific requirements of chemical inspections, and chemical personnel shall conduct related inspections and analyses.
After opening important equipment such as steam drums, steam turbines, and condensers, chemical inspections should be performed first, and then overhaul. After the overhaul
Inform relevant personnel of chemistry major to participate in inspection and acceptance in time.
3.5 Chemical inspectors should be familiar with and implement the safety regulations of GB 26164.1.
3.6 After the overhaul, the chemistry major shall conduct a comprehensive analysis of the corrosion, scaling or salt accumulation of thermal equipment, aiming at the existing
Put forward rectification measures and suggestions for improvement, and organize the compilation of chemical inspection reports for unit maintenance. See Appendix A for its main content.
3.7 The scale samples or tube samples of the main equipment should be kept dry, and the scale samples should be kept for no less than one overhaul period. When the boiler tube samples are stored
The interval between not less than two chemical cleanings. The chemical inspection technical files for the overhaul of the unit should be kept for a long time.
4 Inspection preparation
4.1 Develop inspection plan
In accordance with the provisions of this standard, chemistry majors have formulated this chemical inspection plan based on unit operating status and previous overhaul inspections.
Plan and included in the unit maintenance plan.
4.2 Inspection preparation
Before the unit is overhauled, preparations such as sampling of relevant equipment, on-site photos and inspection records should be done. Check the record sheet see
Appendix B.
4.3 Statistics related indicators
After the unit is out of service, analysis and statistics of relevant information during the two major repairs should be done. The main contents are.
a) The qualification rate of water vapor quality, various abnormal indicators and their exceeding range and duration; those with three-level processing values
Situation etc.
b) Leakage of condenser and other heat exchanger tubes.
c) Water vapor loss rate and pollution discharge rate.
d) Relevant operating parameters reflecting the scaling of thermal equipment, such as boiler pressure difference, condenser end difference and coal consumption.
e) The operating time, stop (standby) time, number of start and stop, maintenance methods and effects of the unit during the two major repairs.
f) Indicators such as steam turbine oil quality analysis and refueling quantity.
g) The purity of hydrogen and the amount of hydrogen supplement.
5 Boiler equipment inspection
5.1 Steam drum
5.1.1 The bottom of the steam drum. Check the stagnant water, including the location, area and depth of the stagnant water; check the sediment condition, including settlement
Accumulation location, sediment morphology, color and amount of sediment. When the amount of deposit is large, the deposit should be taken out, dried, and weighed. Chemical if necessary
Component analysis.
5.1.2 The inner wall of the steam drum. Check the steam side for rust and salt scale, and record its distribution, morphology and size (area, depth).
If the amount of salt scale is small, pH test paper can be used to measure the pH value; if the amount of salt scale is large, chemical composition analysis should be performed. Check the water side
Whether there is sediment and rust, if the thickness of the sediment exceeds 0.5mm, a certain area (not less than 100mm×100mm) should be scraped off.
Weigh after drying to calculate the deposition rate per unit area. Check whether the water vapor dividing line is obvious and smooth, if there is a local "high
Peak" should describe its location.
5.1.3 Check the integrity of the steam-water separation device, whether the cyclone tube is inclined or falling off, and whether there is corrosion or deposits on its surface. in case
During operation, it is found that the superheater or the steam consumption of the steam turbine is significantly increased, or the superheater and the steam turbine are found to be obviously
For salt accumulation, check the integrity of the welds of the inner lining plate of the steam drum.
5.1.4 Check whether the boiler water dosing pipe and the sewage pipe are installed correctly, and whether there is damage, fouling, etc. Check the water distribution pipe,
Whether there are problems such as scaling, fouling and corrosion in the water supply and steam washing device.
5.1.5 Check whether there is salt accumulation and corrosion at the port of the steam outlet pipe, and whether there is deposit on the nozzle of the boiler water downcomer and riser.
5.1.6 If a corrosion indicator is installed in the steam drum, record the surface condition of the corrosion indicator, measure and calculate its deposition rate and corrosion
Eclipse rate.
5.1.7 Acceptance criteria for steam drums. The internal devices and connecting pipes are complete, the interior is clean, and there is no debris left.
5.1.8 The steam drum of the combined cycle waste heat boiler should be inspected in addition to the relevant inspections with reference to the above content.
The flow on the side accelerates the corrosion situation, and the endoscope can be used to check the flow at the port of the steam outlet pipe in the steam drum and the first elbow
Accelerate corrosion conditions.
5.1.9 For the start-up separator of the once-through boiler, relevant inspections can be carried out with reference to the contents of the steam drum inspection.
5.2 Water wall
5.2.1 Pipe cutting requirements for water wall.
a) When the unit is overhauled, at least two pipes should be cut on the water wall. For boilers with double-sided water walls, two more pipes should be cut.
b) The cutting pipe should be selected at the position with the highest thermal load such as the upper part of the top burner; or special bends, bends (oblique) at the cold ash bucket
Poor water vapor circulation parts such as pipes; or the intermediate header lead pipe enters the furnace, etc. There may be water vapor phase change and fluid disturbance.
Of the site.
c) In each pipe cutting inspection, there should be at least one pipe cut at the same elevation as the last pipe cut, and the location is similar or adjacent.
d) If a pipe burst occurs, the pipe burst and adjacent pipes should be cut and inspected. If you find that the appearance of the furnace tube is discolored, swollen,
In the case of packages, cracks, or local flame erosion and thinning, the inspection of abnormal pipe sections should also be increased.
e) The cut length of the pipe sample shall not be less than 0.5m for grinding wheel cutting and not less than 1m for flame cutting. Flame cutting with fins
In the case of water-cooled walls, in order to prevent the cutting heat from affecting the composition of the scale on the inner wall of the pipe, the length of the fins should be kept at least 3mm.
5.2.2 The identification, processing and sample preparation and analysis of the cut tube.
a) The cut pipe samples should be marked with the detailed location and time of pipe cutting, and use a soft brush to clean the cutting residue on the inner surface of the pipe section.
Keep the metal powder and block the nozzles at both ends of the tube; avoid strong vibration and collision during the handling or processing.
b) For flame-cut pipe sections, the heat-affected zone should be removed first, and then the appearance description, including scaling and corrosion on the outer wall;
And measure the inner and outer diameter of the furnace tube. If there is a blast hole, bulge, etc., describe the shape of the blast hole or bulge, and measure its length,
Width and wall thickness at the burst or bulge. The shape of the abnormal pipe section should be taken before taking a sample. Need to do metallography
The pipe section to be inspected is first selected by the metal professional, and another section of the original pipe sample is intercepted and stored in a desiccator.
c) For pipe sections that need to measure the amount of scale, first use a lathe to adjust the thickness of the outer wall to the pipe wall to be 1mm～2mm, and then according to the pipe diameter
Cut pipe sections about 30mm-50mm in length. Coolant should not be used during lathe processing, the speed should not be too fast, and the amount of feed should be
Small, and re-make the position and flow signs on the outer wall of the car light. The intercepted pipe section should be repaired and deburred (be careful not to
Destroy the scale layer in the pipe), cut into two halves according to the fire side and the fire side, and measure the amount of scale. The measurement method is shown in Appendix C.
Before cleaning the tube sample, take pictures of the original state of the inner surface to record the corrosion and scaling, and take pictures again after pickling
The state of the inner surface of the tube. If there are obvious corrosion pits on the inner surface after cleaning, the size, depth and
For the number of corrosion pits per unit area, see Appendix D for the measurement method.
d) Scrape the scale sample on the inner wall of the water wall pipe for chemical composition analysis. See Appendix E for sampling and analysis methods.
e) Before installing the monitoring pipe, use a long-handled brush or compressed air to clean the floating surface of the monitoring pipe.
Rust and dust, and measure the amount of scale. Pickling treatment should be carried out when the amount of scale exceeds 30g/m2.Severe corrosion or
Pipes with local corrosion pits should not be used as monitoring pipes.
5.2.3 When the water wall has an orifice ring, non-destructive testing or pipe cutting shall be used to check the deposition and blockage of the orifice.
5.2.4 After cutting the hand-hole head of the boiler header, check whether there are any deposits, welding slag and other sundries in the header.
5.3 Economizer
5.3.1 Requirements for economizer pipe cutting.
a) When the unit is overhauled, pipes should be cut at the outlet of the economizer inlet header and the inlet of the outlet header respectively.
The location should be as close as possible to the header; at least one of them is adjacent or close to the location of the last inspection and cutting pipe. Monitoring pipe section and its
The pipe sections in the parts that are prone to corrosion (such as the horizontal pipe in the inlet section or the pipe that is easily abraded by fly ash) can be cut as appropriate.
Analysis.
b) The cutting length of the pipe sample shall not be less than 0.5m for grinding wheel cutting and not less than 1m for flame cutting.
5.3.2 The marking, processing, and sample preparation and analysis of economizer cut tubes shall be carried out in accordance with the requirements of 5.2.2.
5.4 Superheater
5.4.1 Superheater cutting pipe requirements.
a) The final superheater should be cut according to the material of the heating surface. At least one furnace tube of each material should be cut. The other superheaters
Cut as needed.
b) When cutting the pipe, you should first select the pipe that has burst and its vicinity, and then select the pipe diameter that has swollen or the color of the pipe wall is different.
For the parts with obvious changes, choose the part with high smoke temperature.
c) The pipe sample should be cut with a grinder, and the length should not be less than 0.5m.
5.4.2 Check whether there is salt accumulation on the inner wall of the pipe, and whether there is accumulation of water and corrosion at the vertical elbow. Use pH test paper to measure the pH value for trace salt accumulation,
When there is a lot of salt accumulation, take samples for chemical composition analysis.
5.4.3 Check the formation and shedding of oxide scale on the inner wall of the pipe, and describe the surface condition.
5.4.4 Process the tube sample according to the requirements of 5.2.2, and then measure the oxide scale thickness or scale. The measurement method is shown in Appendix C. root
According to the need to detect the chemical composition of the oxide scale or scale, see Appendix E for the detection method.
5.5 Reheater
5.5.1 Reheater cutting pipe requirements
a) The final reheater should be cut according to the material of the heating surface. At least one furnace tube of each material should be cut. The other reheaters
Cut as needed.
b) When cutting the pipe, first select the pipe that has burst and the nearby parts, and then select the pipe diameter to expand or the color of the pipe wall is obvious
For the changed parts, finally choose the part with high smoke temperature.
c) The pipe sample should be cut with a grinder, and the length should not be less than 0.5m.
5.5.2 Check whether there is salt accumulation on the inner wall of the pipe, and whether there is accumulation of water and corrosion at the vertical elbow. Use pH test paper to measure the pH value for trace salt accumulation.
When there is a lot of salt accumulation, take samples for composition analysis.
5.5.3 Check the formation and shedding of oxide scale on the inner wall of the tube, and describe its surface condition.
5.5.4 Process the reheater tube sample according to the requirements of 5.2.2, and then measure the thickness or scale of the oxide scale. The measurement method is shown in the attachment
Record C. Detect the chemical composition of oxide scale or scale according to need. See Appendix E for the detection method.
5.6 Heating surface and header of waste heat boiler
5.6.1 When the waste heat boiler is overhauled, the evaporator, economizer and other heating surfaces should be inspected by pipe cutting. The pipe cutting position should be close to the top and bottom
Header, or smoke inlet and exhaust part of waste heat boiler. The identification and processing of the tube sample and the preparation and analysis of the tube sample shall be carried out in accordance with 5.2.2.
5.6.2 When the heating surface cannot be cut, the representative upper and lower header hand holes can be cut, and an endoscope can be used to spot check the internal corrosion and sinking of the furnace tube.
Product status.
5.6.3 The outlet of the low pressure economizer, the inlet of the medium pressure economizer, and the last of the low pressure evaporator into the upper header (or low pressure drum)
For parts that are prone to flow accelerated corrosion, such as elbows, the internal corrosion can be checked by means of wall thickness measurement and endoscope.
When the tube wall is found to be thinner, the detection range should be expanded and representative tube samples should be taken.
5.6.4 The superheater of the waste heat boiler shall be cut into the representative upper and lower headers, and the inner wall of the furnace tube shall be spot-checked for corrosion and deposition with an endoscope.
condition.
5.6.5 Check the high temperature corrosion, low temperature corrosion and out-of-service corrosion of the metal on the flue gas side of the waste heat boiler.
5.6.6 Check the accumulation of water and sediment in the upper and lower headers of the waste heat boiler, and if necessary, take samples for chemical composition analysis.
6 Steam turbine inspection
6.1 Check whether there are mechanical damages or pits on the various blades and baffles of the steam turbine. For blades with severe mechanical damage or deep pits, they should be
Carry out detailed records and photographs, including the damage location, the depth of the pit, the number of pits per unit area, etc., and compare the results of previous inspections
For comparison, see Appendix D for inspection methods.
6.2 Check and record the salt accumulation and deposition of the blades and partitions at all levels. For blades with larger deposits, scrape the part with the largest amount of fouling
To analyze the chemical composition of the deposited sediments, see Appendix E for the analysis method; and measure the amount of sediment per unit area, see the attachment for the measurement method
Record F. The sediment of each stage of the steam turbine blades should be collected separately and then analyzed for composition; if the salt accumulation on the blades is too small, it cannot meet the inspection requirements.
When testing the requirements, the sediments of the blades and partitions of the same level can be mixed and analyzed; if the requirements are still not met, it is allowed to connect two or more adjacent levels
The composition analysis of the first-stage blade sediments is carried out after mixing.
6.3 Wet the pH test paper with demineralized water, paste it on the parts where the fouling amount of leaves at all levels is large, and measure and record the pH value.
6.4 Qualitative detection of copper fouling at all levels of blades, see Appendix G for detection methods.
6.5 Check whether there are defects or damages in the shrouds of all levels of blades, and whether there are deposits on the inside of the shrouds. If so, samples should be taken for chemical composition.
analysis.
6.6 Check the pitting corrosion and corrosion of the blades, shrouds and rotating shafts at all levels; check the erosion and corrosion of the final blades of the low-pressure cylinder.
6.7 The small steam turbine of the steam-driven feed water pump shall be inspected according to the requirements given in 6.1-6.6.
7 Condenser inspection
7.1 Wet condenser
7.1.1 The following items should be checked on the water side of the wet condenser.
a) Check the deposition of silt and debris in the water chamber and the adhesion of sludge. Seawater once-through cooling system should check the breeding of sea creatures
Happening.
b) Check the scouring, fouling, fouling and corrosion of the nozzle of the condenser tube, and whether the plug of the tube is loose or falling off
phenomenon.
c) Check the corrosion of the inner wall and internal support members of the water chamber.
d) Check the integrity of the anti-corrosion (sacrificial anode protection or anti-corrosion coating) of the condenser water chamber and its pipes.
e) Record the leak detection of the condenser water.
7.1.2 The following items should be checked on the steam side of the wet condenser.
a) Check whether the top outermost condenser tube is damaged by foreign matter or steam blown.
b) Check whether the condenser tube directly affected by the steam turbine start bypass exhaust steam, high-pressure drainage, etc. is blown out or erosion-corrosive.
condition.
c) Check the wear of the diaphragm of the outermost condenser tube or the damage and cracks of the condenser tube caused by vibration between the diaphragms.
condition.
d) Check the deposition of...
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