CN114060790B - Maintenance method for gas-started boiler - Google Patents
Maintenance method for gas-started boiler Download PDFInfo
- Publication number
- CN114060790B CN114060790B CN202111303147.4A CN202111303147A CN114060790B CN 114060790 B CN114060790 B CN 114060790B CN 202111303147 A CN202111303147 A CN 202111303147A CN 114060790 B CN114060790 B CN 114060790B
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- boiler
- gas
- water
- starting
- maintenance
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- 238000012423 maintenance Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 110
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 13
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 13
- 239000010452 phosphate Substances 0.000 claims abstract description 13
- 238000011010 flushing procedure Methods 0.000 claims abstract description 12
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 9
- 239000000779 smoke Substances 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- 238000001816 cooling Methods 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 70
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 19
- 229910052757 nitrogen Inorganic materials 0.000 description 9
- 238000000605 extraction Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 238000005536 corrosion prevention Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/025—Devices and methods for diminishing corrosion, e.g. by preventing cooling beneath the dew point
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
- F22B37/52—Washing-out devices
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention relates to the technical field of boiler maintenance, and discloses a gas-started boiler maintenance method, which comprises the following steps: adding water with pH of 8.5-10.5 into a gas starting boiler through a water supply pump and a water supply ammonia pump for flushing; step two: starting the gas start boiler by ignition, and adding phosphate into the gas start boiler through a phosphate pump to adjust the pH value of water in the gas start boiler to 10-12; step three: keeping the normal operation of the gas start boiler for 1-2 hours; step four: stopping the gas to start the boiler when the gas is flameout and naturally cooling the boiler; step five: closing a valve communicated with the outside except for a discharge valve, and adding water into the gas starting boiler to the discharge valve of the gas starting boiler so as to continuously discharge water; step six: and closing a water inlet valve and an air outlet valve of the gas starting boiler, and enabling the gas starting boiler to enter a maintenance state. The invention has good and comprehensive maintenance effect and low cost, does not need to continuously provide medium and does not cause resource waste.
Description
Technical Field
The invention relates to the technical field of boiler maintenance, in particular to a gas-started boiler maintenance method.
Background
The gas-started boiler is one of the essential important equipment of the thermal power plant, and is used for providing auxiliary steam for a unit when the thermal power plant is started in a full-cold state in the whole plant, and is used for sealing steam of a host machine and a small machine, heating steam for a heater of a primary air system of the boiler, heating steam for throwing a deaerator and the like.
The gas starting boiler is only used for starting in a fully cold state after the whole plant unit of the thermal power plant is stopped, so that the use frequency is low, and the gas starting boiler is in a maintenance standby state in daily life. The existing gas-fired boiler maintenance generally comprises two maintenance modes of wet method and dry method, and wet method maintenance is carried out, for example, steam extraction (steam) maintenance of an operation unit and continuous drainage maintenance of an operation boiler; dry maintenance generally refers to maintenance by nitrogen-charging methods, and the like.
The steam extraction maintenance of the operation unit means that steam is extracted from a certain stage of the operation unit or auxiliary steam provided by the operation unit is used, the steam has certain pressure and temperature, then the steam is connected into a gas starting boiler water supply inlet pipe or a water cooling wall lower header (set according to different types of the gas boiler) through a pipeline, a certain pressure and water level of a starting boiler water vapor system are maintained, and simultaneously a vent door, a drain door and the like of a starting boiler steam outlet header are opened to keep continuous flow of the steam to achieve a maintenance heating state, however, the steam is required to be continuously injected into the starting boiler by the steam extraction maintenance of the operation unit, so that a great deal of energy waste is caused.
The connection mode of continuously discharging sewage of the running unit boiler to the maintenance of the gas-fired start boiler is similar to the connection mode of steam maintenance, and the principle is similar, but working medium is used for maintaining the working medium to be continuous drainage of the running boiler, however, when the continuous drainage of the running unit boiler is used for maintenance, the continuous drainage of the boiler belongs to waste water with extremely high salt content concentration, the water quality is extremely poor, namely the waste water which should be removed from the boiler is directly and continuously injected into the start boiler for a long time, and therefore, the scale corrosion in the start boiler tube is inevitably caused.
The dry nitrogen filling maintenance method is to fill nitrogen into a boiler water system and keep a certain positive pressure to prevent air from entering. Because nitrogen is very inactive and non-corrosive, the boiler can be prevented from being corroded by stopping, however, when the nitrogen is used for maintaining the boiler, the water vapor in the starting boiler is required to be drained, and then the water vapor in the boiler is purged by compressed air. After purging, sealing the water vapor system; and then filling nitrogen into the starting boiler, and keeping the pressure of 0.3-0.5 MPa to isolate air. The start-up boiler cannot be completely and tightly sealed, so that nitrogen gas must be periodically supplemented into the start-up boiler; the price of nitrogen is relatively high, and the long-time maintenance of nitrogen is relatively low, so that the method is only suitable for protecting the short-term shutdown boiler.
Disclosure of Invention
The invention aims to solve the technical problems of energy waste, incomplete maintenance, damage to a furnace tube by maintenance working medium, environmental pollution caused by maintenance waste discharge, high maintenance cost and the like caused by a traditional maintenance mode.
In order to achieve the above object, the present invention provides a maintenance method for a gas-fired start-up boiler, comprising the steps of:
step one: starting a water supply pump of the gas starting boiler, starting a water supply and ammonia adding pump to add water into the gas starting boiler, adjusting the pH value of the water fed into the gas starting boiler to 8.5-10.5, flushing the gas starting boiler until flushing water discharged from the gas starting boiler is clear and free of impurities, and stopping flushing;
step two: starting a gas starting boiler by ignition, starting a water supply pump and a water supply ammonia adding pump of the gas starting boiler in the process of boosting the gas starting boiler, and simultaneously starting a phosphate pump to add phosphate into the gas starting boiler, so that the pH value of water in the gas starting boiler is regulated to 10-12;
step three: on the premise of keeping the pH value of water in the gas start-up boiler to be 10-12, keeping the gas start-up boiler to normally operate for 1-2 h;
step four: stopping the gas starting boiler after flameout, closing a smoke valve of the gas starting boiler to seal a hearth of the gas starting boiler, and naturally cooling the gas starting boiler;
step five: when the pressure of a steam drum of the gas start-up boiler is reduced to 0.3 Mpa-0.4 Mpa and the temperature of water in the gas start-up boiler is 70 ℃ -80 ℃, opening an air discharge valve of the gas start-up boiler, closing all valves communicated with the outside except the air discharge valve, and adding water into the gas start-up boiler until the air discharge valve of the gas start-up boiler has continuous water discharge;
step six: and closing a water inlet valve and an air outlet valve of the gas starting boiler, and enabling the gas starting boiler to enter a maintenance state.
In a preferred embodiment of the present invention, in the first step, the discharged washing water is recovered.
In the third step, when the outlet steam parameter of the gas start-up boiler reaches the rated value, the auxiliary machine and the instrument of the gas start-up boiler are detected.
In the fourth step, after the air-smoke valve of the gas-started boiler is closed, the steam exhaust valve of the gas-started boiler is closed, the water is fully filled into the boiler barrel of the gas-started boiler, and when the water level of the boiler barrel of the gas-started boiler is reduced, intermittent water filling is performed.
In the fifth step, when water is added to the gas start-up boiler, the pH of the water in the gas start-up boiler is preferably maintained at 10 to 12.
As a preferred embodiment of the present invention, the maintenance method is performed once a month.
Compared with the prior art, the method for maintaining the gas-started boiler has the beneficial effects that: after the gas starting boiler enters a maintenance stage, the state, the water level and the like of the gas starting boiler do not need to be monitored in real time, and the operation is simple and convenient; steam or hot water or other working media are not required to be continuously injected into the starting boiler in the maintenance stage, so that the energy and working media loss is greatly reduced; discontinuous outward drainage and steam exhaust do not produce secondary pollution; the steam-water pipeline and the hearth fume system in the boiler can be effectively maintained, and the problem that the traditional maintenance only focuses on the internal maintenance of the steam-water pipeline and does not focus on the overall maintenance of the boiler is solved; the method has the advantages that inert gases such as nitrogen are not needed, only ammonia water and phosphate with low cost are added when the boiler is started to supply water and run, so that the water quality and the pH value are regulated, the gas-fired boiler is not needed to be added with medicine and supplement water in the maintenance process, the maintenance is simple and convenient, the effect is obvious, and the cost price is low.
Detailed Description
The following describes the embodiments of the present invention in further detail. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
The maintenance method of the gas-fired start-up boiler of the preferred embodiment of the invention comprises the following steps:
step one: starting a water supply pump of the gas starting boiler, starting a water supply and ammonia adding pump to add water into the gas starting boiler, adjusting the pH value of the water fed into the gas starting boiler to 8.5-10.5, flushing the gas starting boiler until the pH value of flushing water discharged from the gas starting boiler is 8.5-10.5, and stopping flushing; the ammonia is added into the water by the water feeding ammonia adding pump so as to adjust the pH value of the water, the alkaline water is used for flushing the gas starting boiler, the rust removal effect is achieved, and when the discharged flushing water is clear and free of impurities, the inside of the gas starting boiler is basically flushed.
Step two: the ignition starts the gas start boiler, in the process that the gas start boiler is boosted, the water supply pump and the water supply ammonia pump of the gas start boiler are started to add water into the gas start boiler, meanwhile, the phosphate pump is started to add phosphate into the gas start boiler, the adding amount of the phosphate is adjusted according to the pH value of water in the gas start boiler, the pH value of the water in the gas start boiler is ensured to be adjusted to 10-12, rust removal and corrosion prevention are further realized, phosphate molecules can form a layer of protective film on the metal surface to isolate air except the pH value of the water, and the film can increase the adhesive force with coating, so that the corrosion prevention effect is realized.
Step three: on the premise of keeping the pH value of water in the gas start-up boiler to be 10-12, keeping the gas start-up boiler to normally operate for 1-2 h; the water vapor generated during the operation of the gas start-up boiler can carry phosphate molecules to flow through a vapor pipeline of the gas start-up boiler, so that the maintenance of the vapor pipeline is realized.
Step four: stopping the gas starting boiler after flameout, closing a smoke valve of the gas starting boiler to seal a hearth of the gas starting boiler, and naturally cooling the gas starting boiler.
Step five: when the pressure of the steam drum of the gas start-up boiler is reduced to 0.3 Mpa-0.4 Mpa, the water in the gas start-up boiler is at 70 ℃ to 80 ℃, the water is not gasified into water vapor at the temperature, false water level does not appear in the gas start-up boiler, the air release valve of the gas start-up boiler is opened, all valves communicated with the outside except the air release valve are closed, such as the air supply valve, the waterproof valve, the hydrophobic valve and the blow-down valve of the gas start-up boiler, and then water is added into the gas start-up boiler to the air release valve of the gas start-up boiler for continuous water discharge.
Step six: the water inlet valve and the air outlet valve of the gas starting boiler are closed, the gas starting boiler is in a maintenance state, the whole gas starting boiler is soaked by alkaline water, the rust prevention maintenance function is achieved, after the gas starting boiler enters a maintenance stage, the state, the water level and the like of the gas starting boiler do not need to be monitored in real time, and the operation is simple and convenient.
In the embodiment, steam or hot water or other working media are not required to be continuously injected into the starting boiler in the maintenance stage, so that the energy and working media losses are greatly reduced; discontinuous outward drainage and steam exhaust do not produce secondary pollution; the steam-water pipeline and the hearth fume system in the boiler can be effectively maintained, and the problem that the traditional maintenance only focuses on the internal maintenance of the steam-water pipeline and does not focus on the overall maintenance of the boiler is solved; the method does not need to use inert gases such as nitrogen, and only adds a small amount of ammonia water and phosphate for adjusting water quality and pH value when the boiler is started to water and runs; the boiler does not need to be added with medicine and supplementing water in the maintenance process, and has simple and convenient maintenance, obvious effect and low cost.
Illustratively, in step one, the discharged rinse water is recovered, fully utilizing the resources.
In the third step, when the outlet steam parameters of the gas start-up boiler reach rated values, the auxiliary machines and the instruments of the gas start-up boiler are detected, so that the states of the auxiliary machines, the instruments and the automatic devices of the gas start-up boiler can be effectively checked, the actual maintenance is achieved, and the boiler really reaches a standby state.
In the fourth step, the air-smoke valve of the gas-started boiler is closed, the steam exhaust valve of the gas-started boiler is closed, the water is filled into the boiler barrel of the gas-started boiler, when the water level of the boiler barrel of the gas-started boiler is reduced, the water in the boiler is intermittently filled with water, the heated water evaporation phase state of the water changes, the water in the boiler exists in a state of a steam-water mixture, namely, the water contains steam bubbles (non-air bubbles, namely, water steam bubbles), the density of the water is reduced, the volume is increased, and if the boiler is continuously heated, the state is always kept; if the heat source is removed, the boiler continuously dissipates heat and cools, the vapor bubbles in the boiler pipeline are condensed and restore to the full water state, and the volume is reduced, so that the hot boiler is false after being full of water, and intermittent water supplementing is needed to keep the continuous full water state of the boiler.
Illustratively, the present maintenance method is performed once a month.
Claims (4)
1. A maintenance method for a gas-fired start-up boiler is characterized by comprising the following steps: the method comprises the following steps:
step one: starting a water supply pump of the gas starting boiler, starting a water supply and ammonia adding pump to add water into the gas starting boiler, adjusting the pH value of the water fed into the gas starting boiler to 8.5-10.5, flushing the gas starting boiler until flushing water discharged from the gas starting boiler is clear and free of impurities, and stopping flushing;
step two: starting a gas starting boiler by ignition, starting a water supply pump and a water supply ammonia pump of the gas starting boiler to add water into the gas starting boiler in the process of boosting the gas starting boiler, and starting a phosphate pump to add phosphate into the gas starting boiler at the same time, so that the pH value of the water in the gas starting boiler is regulated to 10-12;
step three: on the premise of keeping the pH value of water in the gas start-up boiler to be 10-12, keeping the gas start-up boiler to normally operate for 1-2 h;
step four: stopping the gas starting boiler after flameout, closing a smoke valve of the gas starting boiler to seal a hearth of the gas starting boiler, and after the gas starting boiler is naturally cooled, closing a steam exhaust valve of the gas starting boiler, filling water into a boiler barrel of the gas starting boiler, and when the water level of the boiler barrel of the gas starting boiler is reduced, intermittently filling water;
step five: when the pressure of a steam drum of the gas start-up boiler is reduced to 0.3 Mpa-0.4 Mpa and the temperature of water in the gas start-up boiler is 70 ℃ -80 ℃, opening an air discharge valve of the gas start-up boiler, closing all valves communicated with the outside except the air discharge valve, and continuously discharging water from the air discharge valve for adding water into the gas start-up boiler to the air discharge valve of the gas start-up boiler, wherein when water is added into the gas start-up boiler, the pH value of the water in the gas start-up boiler is required to be ensured to be 10-12;
step six: and closing a water inlet valve and an air outlet valve of the gas starting boiler, and enabling the gas starting boiler to enter a maintenance state.
2. The gas-fired boiler maintenance method according to claim 1, wherein: in the first step, the discharged washing water is recovered.
3. The gas-fired boiler maintenance method according to claim 1, wherein: in the third step, when the outlet steam parameter of the gas start-up boiler reaches the rated value, detecting auxiliary machines and instruments of the gas start-up boiler.
4. The gas-fired boiler maintenance method according to claim 1, wherein: the maintenance method is carried out once a month.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111303147.4A CN114060790B (en) | 2021-11-04 | 2021-11-04 | Maintenance method for gas-started boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111303147.4A CN114060790B (en) | 2021-11-04 | 2021-11-04 | Maintenance method for gas-started boiler |
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| Publication Number | Publication Date |
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| CN114060790A CN114060790A (en) | 2022-02-18 |
| CN114060790B true CN114060790B (en) | 2024-02-20 |
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| CN202111303147.4A Active CN114060790B (en) | 2021-11-04 | 2021-11-04 | Maintenance method for gas-started boiler |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020034448A (en) * | 2000-11-01 | 2002-05-09 | 이구택 | Control circuit and method of starting system for boiler |
| CN1667344A (en) * | 2005-04-07 | 2005-09-14 | 濮文虹 | On-load washing method for thermodynamic system |
| CN104073808A (en) * | 2014-06-18 | 2014-10-01 | 华电电力科学研究院 | Stop protection agent and stop protection method for waste heat boiler of gas turbine power plant |
-
2021
- 2021-11-04 CN CN202111303147.4A patent/CN114060790B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020034448A (en) * | 2000-11-01 | 2002-05-09 | 이구택 | Control circuit and method of starting system for boiler |
| CN1667344A (en) * | 2005-04-07 | 2005-09-14 | 濮文虹 | On-load washing method for thermodynamic system |
| CN104073808A (en) * | 2014-06-18 | 2014-10-01 | 华电电力科学研究院 | Stop protection agent and stop protection method for waste heat boiler of gas turbine power plant |
Non-Patent Citations (3)
| Title |
|---|
| 国外一些火电厂热力设备停备用保护方法;邵印;;吉林电力(02);全文 * |
| 浅析燃机余热锅炉停炉保养的技术应用;张杰;;科技资讯(31);全文 * |
| 浅谈锅炉运行及维护保养工作;张青;;能源与环境(04);第5页 * |
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