CN114017766A - Hot water circulating system and method applied to full-load denitration of subcritical power station boiler - Google Patents
Hot water circulating system and method applied to full-load denitration of subcritical power station boiler Download PDFInfo
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- CN114017766A CN114017766A CN202111329096.2A CN202111329096A CN114017766A CN 114017766 A CN114017766 A CN 114017766A CN 202111329096 A CN202111329096 A CN 202111329096A CN 114017766 A CN114017766 A CN 114017766A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 184
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 20
- 230000001105 regulatory effect Effects 0.000 claims abstract description 19
- 238000011144 upstream manufacturing Methods 0.000 claims description 22
- 238000004891 communication Methods 0.000 claims description 3
- 239000000779 smoke Substances 0.000 abstract description 10
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000004781 supercooling Methods 0.000 abstract description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 22
- 239000003546 flue gas Substances 0.000 description 22
- 239000003054 catalyst Substances 0.000 description 8
- 230000033228 biological regulation Effects 0.000 description 4
- 239000003245 coal Substances 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
- F22D5/26—Automatic feed-control systems
- F22D5/32—Automatic feed-control systems influencing the speed or delivery pressure of the feed pumps
-
- 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
- F22B37/10—Water tubes; Accessories therefor
- F22B37/14—Supply mains, e.g. rising mains, down-comers, in connection with water tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
- F22D5/26—Automatic feed-control systems
- F22D5/34—Applications of valves
Abstract
The invention discloses a hot water circulation system applied to full-load denitration of a subcritical power station boiler, which comprises: the collecting box is provided with a pipeline I and a pipeline II, and the pipeline I is communicated with a down pipe of the steam pocket; and the water inlet end of the circulating pump is communicated with the pipeline II, the water outlet end of the circulating pump is provided with a pipeline III, the pipeline III is communicated with a main water supply pipeline of the economizer and is provided with an adjusting valve, the pipeline II is provided with a pressure detection device and a temperature detection device, and a water outlet pipe of the economizer is provided with the temperature detection device. The method has the beneficial effect that under the working condition of low load of the unit, the opening of the regulating valve of the boiler circulating pump loop is regulated to ensure that hot water at the outlet of the economizer and entering the steam pocket has enough super-cooling degree. The invention provides a hot water circulation method applied to full-load denitration of a subcritical power station boiler. The beneficial effects of improving the temperature of the inlet water of the economizer and improving the temperature of the inlet smoke of the denitration device are achieved.
Description
Technical Field
The invention relates to the technical field of full-load denitration of subcritical power station boilers. More specifically, the invention relates to a hot water circulation system and a method applied to full-load denitration of a subcritical power station boiler.
Background
At present, Selective Catalytic Reduction (SCR) technology is mostly adopted in denitration devices of power station boilers, and the adopted catalyst requires a common working temperature range of 300-400 ℃ (related to coal types, catalyst types and the like). In conventional boiler designs, the following problems can exist: when the unit load is higher, the inlet smoke temperature of the denitration device is just in the normal operation range of the catalyst, and when the unit load is lower, the inlet smoke temperature of the denitration device is lower and is lower than the normal use temperature of the catalyst. If the designed smoke temperature at the inlet of the denitration device is increased to meet the requirement of the catalyst under low load, the smoke temperature is higher under high load, so that the exhaust gas temperature is high, the boiler efficiency is low, and the economy is poor; however, this will cause the utility boiler to operate the denitration device only in a split manner at low load, and thus cannot meet the latest requirement of the emission index of nitrogen oxides in the power plant, because when the flue gas temperature at the inlet of the SCR is too low, the activity of the catalyst is reduced, and the escape of ammonia is increased, so that the catalyst reacts with sulfur trioxide in the flue gas to form ammonium bisulfate, which causes the blockage of downstream equipment such as an air preheater, and even damages the catalyst.
With the successive departure of national environmental protection standards and environmental protection policies in recent years, the requirement for the emission of atmospheric pollutants of thermal power units is more and more strict, meanwhile, in order to respond to the requirement of a national deep peak regulation policy, the deep peak regulation capability of the thermal power units needs to be improved, the grid connection of the thermal power units and loads above the thermal power units need to be realized by a power station boiler, the requirement that the inlet smoke temperature of a denitration device reaches the use temperature of the denitration device is absolutely necessary, and the subcritical thermal power units also need to adapt to the requirement of the policy to realize the deep peak regulation capability of the thermal power units.
At present, most of power station units can only realize wide-load denitration, and the adopted methods comprise coal economizer grading arrangement, a flue gas bypass system, a coal economizer water side bypass system and the like. The grading economizer has poor high-low load matching performance and cannot meet the requirement of full-load denitration; the flue gas bypass has the defects of poor distribution of a flue gas temperature field, low reliability of a flue gas baffle and the like; the water side bypass of the economizer has the defects of limited temperature raising range, easy vaporization of working medium and the like; the conventional schemes cannot meet the strict national requirements on deep peak regulation of the thermal power generating unit, and the safe and stable improvement of the SCR inlet smoke temperature under the full-load condition cannot be realized.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
The invention also aims to provide a hot water circulating system applied to full-load denitration of a subcritical power station boiler, which can introduce part of hot water in a downcomer into the water inlet end of an economizer, so that the temperature of inlet water of the economizer is increased, the heat exchange end difference between the water and flue gas of the economizer system is reduced, the heat exchange quantity of the flue gas is reduced, and the temperature of inlet flue gas of a denitration device is increased.
To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a hot water circulation system for full-load denitration of a subcritical power plant boiler, comprising:
the collecting box is provided with a pipeline I and a pipeline II in a communication mode, and the pipeline I is communicated with a down pipe of the steam pocket;
and the water inlet end of the circulating pump is communicated with the pipeline II, the water outlet end of the circulating pump is communicated with a pipeline III, the pipeline III is communicated on a main water supply pipeline of the economizer, the pipeline III is provided with an adjusting valve, the pipeline II is close to a temperature detection device of a pressure detection device and a working medium at the inlet of the circulating pump, and a temperature detection device of the working medium is arranged on a water outlet pipe of the economizer. Preferably, be equipped with flowmeter, gate valve, check valve in proper order on the pipeline III, wherein, governing valve on the pipeline III is located between flowmeter and the gate valve on the pipeline III.
Preferably, the system further comprises a pipeline IV, wherein the water outlet end of the pipeline IV is communicated with the collection box, the water inlet end of the pipeline IV is communicated with the pipeline III, the pipeline IV is provided with a regulating valve, and the water inlet end of the pipeline IV is positioned on the upstream of the flow meter of the pipeline III.
Preferably, the system further comprises a warm pipe line, wherein a water inlet end of the warm pipe line is communicated with a water outlet pipe of the economizer and is positioned at the upstream of the water supply bypass line, a water outlet end of the warm pipe line is communicated with the pipe line III and is positioned at the downstream of a connecting interface of the pipe line IV and the pipe line III and at the upstream of a flow meter of the pipe line III, and a gate valve and a check valve are arranged on the warm pipe line.
Preferably, the method further comprises the following steps:
the water inlet end of the water supply bypass pipeline is communicated with the main water supply pipeline, the water outlet end of the water supply bypass pipeline is communicated with the water outlet pipe of the economizer, and the water supply bypass pipeline is provided with an adjusting valve;
working medium temperature detection devices are uniformly arranged at the upstream and the downstream of the water supply bypass pipeline and the water outlet pipe of the economizer, and a pressure detection device is arranged at the upstream.
Preferably, a gate valve, a check valve and a flowmeter are further sequentially arranged on the water supply bypass pipeline, and the regulating valve on the water supply bypass pipeline is located between the gate valve and the check valve.
Preferably, the system further comprises a high pressure throttle valve disposed on the main feed water line and located downstream of the feed water bypass line and upstream of the water outlet end of the line iii.
Preferably, a check valve is provided on the main water supply line and upstream of the high pressure throttle.
The hot water circulation method applied to full-load denitration of the subcritical power station boiler comprises the following steps: when the load of the utility boiler is reduced, the hot water in the downcomer of the steam drum is partially led into the main water supply pipeline.
Preferably, the method further comprises the following steps:
introducing a cold water part on a main water supply pipeline into a water outlet pipe of the economizer;
the cold water amount flowing into the water outlet pipe of the economizer from the main water supply pipeline is increased by constructing a pressure-holding structure on the main water supply pipeline.
The invention at least comprises the following beneficial effects: when the unit operates under a low-load working condition, the opening of the regulating valve is gradually and slowly opened by the pressure head of the circulating pump, part of hot water in the descending pipe is led out and flows through the pipeline I, the collecting box, the pipeline II, the circulating pump and the pipeline III to enter the water inlet end of the economizer, so that the temperature of inlet water of the economizer is increased, the heat exchange end difference of water and flue gas of the economizer system is reduced, the heat exchange quantity of the flue gas is reduced, and the aim of increasing the temperature of inlet flue gas of the denitration device is fulfilled.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
Fig. 1 is a schematic view of a pipeline connection of the hot water circulation system according to one embodiment of the present invention.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1, the present invention provides a hot water circulation system for full-load denitration of a subcritical power station boiler, comprising:
the collecting box 4 is provided with a pipeline I41 and a pipeline II 43 in a communication mode, and the pipeline I41 is communicated with a down pipe of the steam drum 3;
a water inlet end of the circulating pump 42 is communicated with the pipeline II 43, a pipeline III 44 is communicated with a water outlet end of the circulating pump 42, the pipeline III 44 is communicated with the main water supply pipeline 2 in front of the economizer 1, an adjusting valve is arranged on the pipeline III 44, a pressure detection device and a temperature detection device of working media are arranged on the pipeline II 43 and close to an inlet of the circulating pump 42, and a temperature detection device of the working media is arranged on a water outlet pipe of the economizer 1. The boiler system comprises an economizer 1, a main water supply pipeline 2 for supplying water to the economizer 1, and a steam drum 3 communicated with a water outlet pipe of the economizer 1. In the technical scheme, the working medium temperature and the working medium operating pressure in the water outlet pipe of the economizer 1 can be monitored through the working medium pressure detection device and the working medium temperature detection device, the corresponding saturation temperature under the operating pressure is obtained through calculation, and the supercooling degree is calculated based on the monitored temperature. The adjusting process specifically comprises the following steps: when the unit operates under a low-load working condition and meets the limitation of the calculation result of the previous supercooling degree, the opening of the regulating valve is gradually and slowly opened through the pressure head of the circulating pump 42, part of hot water in the downcomer is led out and flows through the pipeline I41, the collection box 4, the pipeline II 43, the circulating pump 42 and the pipeline III 44 to enter the water inlet end of the economizer 1, so that the temperature of inlet water of the economizer 1 is increased, the heat exchange end difference between system water and flue gas of the economizer 1 is reduced, the heat exchange quantity of the flue gas is reduced, the aim of increasing the temperature of inlet flue gas of a denitration device is fulfilled, and the flow of the forced circulation hot water can be controlled by the regulating valve on the pipeline III 44.
In another technical scheme, a flow meter, a gate valve and a check valve are sequentially arranged on the pipeline iii 44, wherein the regulating valve on the pipeline iii 44 is located between the flow meter and the gate valve on the pipeline iii 44. The flowmeter can monitor the flow of working media in the pipeline III 44, the opening of the regulating valve can be conveniently and accurately regulated, and the check valve can avoid backflow of the working media.
In another technical scheme, the system further comprises a pipeline IV 45, wherein the water outlet end of the pipeline IV 45 is communicated with the collection box 4, the water inlet end of the pipeline IV 45 is communicated with the pipeline III 44, a regulating valve is arranged on the pipeline IV 45, and the water inlet end of the pipeline IV 45 is positioned on the upstream of the flow meter of the pipeline III 44.
In the above technical solution, the circulation pump 42 needs to operate normally, and has the minimum flow requirement, and can operate smoothly only when the minimum flow requirement is met, and when the flow passing through the pipeline iii 44 is lower than the minimum flow required by the circulation pump 42, the adjusting valve on the pipeline iv 45 is opened, so that part of water flows back to the collection tank 4 through the pipeline iv 45, and then enters the circulation pump 42 again, thereby playing a role in meeting the minimum flow requirement of the circulation pump 42.
In another technical scheme, the system further comprises a warm pipe line 5, a water inlet end of the warm pipe line 5 is communicated with a water outlet pipe of the economizer 1 and is located at the upstream of the water supply bypass line 6, a water outlet end of the warm pipe line 5 is communicated with the pipe line iii 44 and is located at the downstream of a connection interface of the pipe line iv 45 and the pipe line iii 44 and is located at the upstream of a regulating valve of the pipe line iii 44, and a gate valve and a check valve are arranged on the warm pipe line 5.
In the above technical scheme, the heating pipe 5 guides one path of hot water from the water outlet pipe of the coal economizer 1 to the circulating pump 42, and when the circulating pump 42 is not in operation, the opening of the valve is kept unchanged after the opening of the valve is manually adjusted, so that the heating pipe function is realized.
In another technical solution, the method further comprises:
a water inlet end of the water supply bypass pipeline 6 is communicated with the main water supply pipeline 2, a water outlet end of the water supply bypass pipeline is communicated with a water outlet pipe of the economizer 1, and the water supply bypass pipeline 6 is provided with an adjusting valve;
working medium temperature detection devices are uniformly arranged at the upstream and downstream of the water supply bypass pipeline 6 and the water outlet pipe of the economizer 1, and a pressure detection device is arranged at the upstream. In the technical scheme, the water supply bypass pipeline 6 takes water from the main water supply pipeline to be cold water, and then the cold water is connected to the water outlet pipe of the economizer 1 and positioned at the upstream of the steam drum 3. When the unit is in low load, the water supply bypass pipeline 6 can bypass part of the water supply flow by adjusting the opening of the valve, so that the cold water flow entering the economizer 1 system to participate in flue gas heat exchange is reduced, the heat absorption capacity of the economizer 1 system is reduced, and the inlet smoke temperature of the denitration device is increased.
In another technical scheme, a gate valve, a check valve and a flowmeter are further sequentially arranged on the water supply bypass, and a regulating valve on the water supply bypass 6 is located between the gate valve and the check valve. The flowmeter can monitor the current flow of shunting, and the aperture of adjusting valve is conveniently adjusted to the precision, and the check valve can avoid cold water refluence.
In another technical scheme, the system further comprises a high-pressure throttle valve 21 which is arranged on the main water supply pipeline 2 and is positioned at the downstream of the water supply bypass pipeline 6 and the upstream of the water outlet end of the pipeline III 44.
In the above technical scheme, when the opening of the regulating valve on the water supply bypass pipeline 6 is large but the bypass flow still needs to be further increased, more cold water can be bypassed to the water supply bypass pipeline 6 through the pressure-building effect of the high-pressure throttle valve 21 on the main water supply pipeline, so that the cold water flow entering the economizer 1 system to participate in the flue gas heat exchange is reduced, the heat absorption capacity of the economizer 1 system is reduced, and the inlet smoke temperature of the denitration device is increased.
In another solution, a check valve is provided on the main water supply line 2 and upstream of the high pressure throttle 21.
The hot water circulation method applied to full-load denitration of the subcritical power station boiler comprises the following steps: when the plant boiler load decreases, the hot water portion in the downcomer of the drum 3 is then led into the main feed water line 2.
In the technical scheme, hot water is introduced into the main water supply pipeline 2, so that the water temperature in the main water supply pipeline 2 is increased, the temperature of inlet water of the economizer 1 can be increased, the heat exchange end difference of system water and flue gas of the economizer 1 is reduced, the heat exchange quantity of the flue gas is reduced, the aim of increasing the inlet flue gas temperature of the denitration device is fulfilled, and the flow of forced circulation hot water can be controlled by the adjusting valve on the pipeline III 44.
In another technical scheme, the method further comprises the following steps:
introducing the cold water part on the main water supply pipeline 2 into the water outlet pipe of the economizer 1;
the amount of cold water flowing into the water outlet pipe of the economizer 1 from the main water supply pipeline 2 is increased by constructing a pressure-holding structure on the main water supply pipeline 2.
In the technical scheme, the economizer 1 is avoided by partial cold water in the main water supply pipeline 2, and then hot water is introduced into the main water supply pipeline in a combined mode, so that the water temperature at the inlet of the economizer 1 can be increased, the heat exchange end difference between the system water and the flue gas of the economizer 1 is reduced, the heat exchange quantity of the flue gas is reduced, the aim of increasing the smoke temperature at the inlet of the denitration device is fulfilled, and the flow of forced circulation hot water can be controlled by the adjusting valve on the pipeline III 44.
Wherein, the valve body mark on pipeline III 44 is: a flow meter 401, a regulating valve 402, a gate valve 403, and a check valve 404;
the valve body on line iv 45 is labeled: an adjustment valve 405;
the valve body on the warm pipe line 5 is marked as: a check valve 51, a gate valve 52;
the valve body on the feed water bypass line 6 is marked: a flow meter 61, a check valve 62, a regulating valve 63, and a gate valve 64;
the valve body on the main water supply line 2 is marked as: a high pressure throttle valve 21, a check valve 22.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (10)
1. Be applied to hot water circulating system of subcritical power plant boiler full load denitration, its characterized in that includes:
the collecting box is provided with a pipeline I and a pipeline II in a communication mode, and the pipeline I is communicated with a down pipe of the steam pocket;
and the water inlet end of the circulating pump is communicated with the pipeline II, the water outlet end of the circulating pump is communicated with a pipeline III, the pipeline III is communicated on a main water supply pipeline of the economizer, the pipeline III is provided with an adjusting valve, the pipeline II is close to a temperature detection device of a pressure detection device and a working medium at the inlet of the circulating pump, and a temperature detection device of the working medium is arranged on a water outlet pipe of the economizer.
2. The hot water circulation system applied to full-load denitration of the subcritical power station boiler according to claim 1, wherein a flow meter, a gate valve and a check valve are sequentially arranged on the pipeline III, and the regulating valve on the pipeline III is positioned between the flow meter and the gate valve on the pipeline III.
3. The hot water circulation system applied to full-load denitration of the subcritical power station boiler according to claim 1, further comprising a pipeline IV, wherein the water outlet end of the pipeline IV is communicated with the collection tank, the water inlet end of the pipeline IV is communicated with the pipeline III, the pipeline IV is provided with a regulating valve, and the water inlet end of the pipeline IV is positioned at the upstream of the flow meter of the pipeline III.
4. The hot water circulation system applied to full-load denitration of the subcritical power station boiler according to claim 1, further comprising a warm pipe line, wherein a water inlet end of the warm pipe line is communicated with a water outlet pipe of the economizer and is positioned at the upstream of the water supply bypass line, a water outlet end of the warm pipe line is communicated with the pipe line III and is positioned at the downstream of a connection interface of the pipe line IV and the pipe line III and is positioned at the upstream of a flow meter of the pipe line III, and a gate valve and a check valve are arranged on the warm pipe line.
5. The hot water circulation system for full load denitration of a subcritical utility boiler according to claim 1, further comprising:
the water inlet end of the water supply bypass pipeline is communicated with the main water supply pipeline, the water outlet end of the water supply bypass pipeline is communicated with the water outlet pipe of the economizer, and the water supply bypass pipeline is provided with an adjusting valve;
working medium temperature detection devices are uniformly arranged at the upstream and the downstream of the water supply bypass pipeline and the water outlet pipe of the economizer, and a pressure detection device is arranged at the upstream.
6. The hot water circulation system applied to full-load denitration of the subcritical power station boiler according to claim 1, wherein a gate valve, a check valve and a flow meter are sequentially arranged on the feed water bypass, and a regulating valve on the feed water bypass is positioned between the gate valve and the check valve.
7. The hot water circulation system for full load denitration of a subcritical utility boiler according to claim 1, further comprising a high pressure throttle valve disposed on the main feed water pipe downstream of the feed water bypass pipe and upstream of the water outlet end of the pipe iii.
8. The hot water circulation system for full-load denitration of a subcritical utility boiler according to claim 7, wherein a check valve is provided on the main water feed line and is disposed upstream of the high pressure throttle valve.
9. The hot water circulation method applied to full-load denitration of the subcritical power station boiler based on the system of any one of claims 1 to 8, and is characterized by comprising the following steps: when the load of the utility boiler is reduced, the hot water in the downcomer of the steam drum is partially led into the main water supply pipeline.
10. The method of claim 9 for full-load denitration of a subcritical utility boiler, further comprising the steps of:
introducing a cold water part on a main water supply pipeline into a water outlet pipe of the economizer;
the cold water amount flowing into the water outlet pipe of the economizer from the main water supply pipeline is increased by constructing a pressure-holding structure on the main water supply pipeline.
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| CN202111329096.2A CN114017766A (en) | 2021-11-10 | 2021-11-10 | Hot water circulating system and method applied to full-load denitration of subcritical power station boiler |
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| JPH07208701A (en) * | 1994-01-17 | 1995-08-11 | Ishikawajima Harima Heavy Ind Co Ltd | Temperature controller for inlet gas of denitrating device for boiler |
| CN103084064A (en) * | 2013-01-18 | 2013-05-08 | 广东电网公司电力科学研究院 | System and method for improving operation capacity of SCR (Silicon Controlled Rectifier) denitration device in electric power plant |
| CN106765039A (en) * | 2016-12-27 | 2017-05-31 | 宁夏清远顺合环保科技有限公司 | A kind of SCR inlet flue gas water side temperature raising system and method |
| CN206361703U (en) * | 2016-12-27 | 2017-07-28 | 北京清远顺合环保科技有限公司 | A kind of SCR inlet flue gas temperature raising system for meeting full load denitration |
| CN108844058A (en) * | 2018-08-16 | 2018-11-20 | 杭州华电能源工程有限公司 | A kind of economizer heat water recirculation system and its working method suitable for subcritical drum boiler generating set |
| CN208901364U (en) * | 2018-08-16 | 2019-05-24 | 杭州华电能源工程有限公司 | A kind of economizer heat water recirculation system suitable for subcritical drum boiler generating set |
| CN110822402A (en) * | 2019-11-22 | 2020-02-21 | 四川川锅锅炉有限责任公司 | Horizontal gas corner tube boiler |
| CN216790156U (en) * | 2021-11-10 | 2022-06-21 | 北京巴布科克·威尔科克斯有限公司 | Be applied to hot water circulating system of subcritical power plant boiler full load denitration |
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