CN110906311A - Boiler water charging system - Google Patents

Boiler water charging system Download PDF

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Publication number
CN110906311A
CN110906311A CN201911268189.1A CN201911268189A CN110906311A CN 110906311 A CN110906311 A CN 110906311A CN 201911268189 A CN201911268189 A CN 201911268189A CN 110906311 A CN110906311 A CN 110906311A
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CN
China
Prior art keywords
pump
pipeline
water
boiler
pressure
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Granted
Application number
CN201911268189.1A
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Chinese (zh)
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CN110906311B (en
Inventor
王正伟
范守华
肖辉
薛敏
褚东发
宋志刚
杨燕华
詹旭
梁白月
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China Tobacco Henan Industrial Co Ltd
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China Tobacco Henan Industrial Co Ltd
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Priority to CN201911268189.1A priority Critical patent/CN110906311B/en
Publication of CN110906311A publication Critical patent/CN110906311A/en
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Publication of CN110906311B publication Critical patent/CN110906311B/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22DPREHEATING, 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
    • F22D1/00Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/50Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22DPREHEATING, 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
    • F22D11/00Feed-water supply not provided for in other main groups
    • F22D11/02Arrangements of feed-water pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22DPREHEATING, 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
    • F22D5/00Controlling water feed or water level; Automatic water feeding or water-level regulators
    • F22D5/26Automatic feed-control systems
    • F22D5/34Applications of valves

Abstract

The invention provides a boiler water supplementing system, which comprises a pre-pump pipeline, a softened water supply system and a pressure stabilizing device, wherein the pre-pump pipeline is used for pumping softened water by a boiler feed pump, and is connected with an output pipeline of the softened water supply system; a first check valve is arranged on the output pipeline; the pressure stabilizing device is connected with the pump front pipeline through a connecting pipeline, and an adjusting valve is arranged on the connecting pipeline; the pressure stabilizing device can keep the pressure in the pipeline in front of the pump to be constant. According to the boiler water replenishing system, the pressure in the pipeline in front of the pump can be kept constant through the pressure stabilizing device, and the negative pressure generated in the pipeline in front of the pump is avoided, so that the possibility of cavitation generation of a boiler water feeding pump is reduced; meanwhile, the first check valve arranged on the output pipeline can prevent softened water in the pump front pipeline from flowing backwards and softening the water supply system, so that the pressure in the pump front pipeline is kept constant, and the possibility of cavitation of the boiler feed water pump is further reduced.

Description

Boiler water charging system
Technical Field
The invention relates to the technical field of water supplementing systems, in particular to a boiler water supplementing system.
Background
The boiler is installed to a lot of cigarette enterprises, and the softened water after the deoxidization is adopted to the boiler feedwater, and the softened water deoxidization adopts convenient, practical, the better heating power deoxidization of effect usually, and the heating power deoxidization is according to dalton partial pressure law promptly, heats the softened water more than 100 ℃ in the oxygen-eliminating device, and the oxygen of aquatic will be followed the softened water and escaped. However, because the water level of the thermal deoxygenation is high, when the boiler feed pump suddenly rotates or the load is suddenly increased, negative pressure is easily generated in a pipeline at the front end of the water pump to cause cavitation erosion of the boiler feed pump, so that an impeller of the boiler feed pump is easily damaged, the water supply flow cannot reach the required water supply amount, and even the boiler cannot normally supply water.
In the prior art, the method for solving the cavitation of the boiler feed water pump generally comprises the step of enabling the installation height of the deaerator to be larger than that of the boiler feed water pump, so that the overall building of a boiler room is higher, or the local building provided with the deaerator is very high, the building cost is increased, and the appearance of the building is not attractive. Therefore, how to reduce the possibility of cavitation of the boiler feed water pump becomes a technical problem which needs to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention aims to provide a boiler water replenishing system to solve the technical problems in the prior art, so that the possibility of cavitation of a boiler feed water pump is reduced.
In order to achieve the purpose, the invention provides the following technical scheme:
a boiler water supplementing system comprises a pre-pump pipeline, a softened water supply system and a pressure stabilizing device, wherein the pre-pump pipeline is used for pumping softened water by a boiler feed pump, and is connected with an output pipeline of the softened water supply system; a first check valve is arranged on the output pipeline; the pressure stabilizing device is connected with the pump front pipeline through a connecting pipeline, and an adjusting valve is arranged on the connecting pipeline; the pressure stabilizing device can keep the pressure in the pipeline in front of the pump to be constant.
Preferably, the pressure stabilizing device comprises a pressure stabilizing tank and a leather bag positioned in the pressure stabilizing tank, and the leather bag is connected with the pipeline in front of the pump through the connecting pipeline.
Preferably, the pressure stabilizing device further comprises an air compressor, a first electric valve and a pressure sensor, wherein the pressure sensor is arranged on the pressure stabilizing tank, the air compressor is connected with the pressure stabilizing tank through an air supply pipeline, and the first electric valve is arranged on the air supply pipeline.
Preferably, the pressure stabilizing device further comprises a pressure gauge and a drain pipe, and the pressure gauge is arranged on the pressure stabilizing tank; one end of the drain pipe is connected with the connecting pipeline, and a drain valve is arranged on the drain pipe.
Preferably, the boiler water supply system further comprises a three-way valve, an inlet of the three-way valve is connected with a water outlet pipe of the boiler water supply pump, a first outlet of the three-way valve is connected with the boiler through a water supply pipeline, and a second outlet of the three-way valve is connected with the pump front pipeline through a water return pipeline.
Preferably, a second check valve is arranged on the water supply pipeline.
Preferably, two water conveying pipelines are arranged in parallel between the pump front pipeline and the water outlet pipe, and a first valve, the boiler feed water pump, a third check valve and a second valve are sequentially arranged on the water conveying pipelines.
Preferably, the softened water supply system comprises a softened water tank and two deaerators, the softened water tank is respectively connected with the two deaerators through water supply pipelines, and the deaerators are also connected with the steam delivery pipe; a second electric valve and a fourth check valve are arranged on the steam delivery pipe; a third valve, a water suction pump, a fifth check valve, a fourth valve and a third electric valve are sequentially arranged on the water supply pipeline; the output pipeline is connected with the deaerator; and a liquid level meter is arranged on the deaerator.
Preferably, the deaerator and the boiler are arranged on the ground floor of the boiler room, and the boiler feed water pump is arranged on the ground floor.
Preferably, the pipe diameter of the pipeline before the pump is larger than that of the output pipeline.
The invention has the beneficial effects that:
according to the boiler water replenishing system, the pressure stabilizing device is connected with the pipeline in front of the pump through the connecting pipeline, so that when the water pump is started or the load is suddenly increased, the pressure in the pipeline in front of the pump can be kept constant through the pressure stabilizing device, the negative pressure generated in the pipeline in front of the pump is avoided, and the possibility of cavitation generated by the boiler water feeding pump is reduced; meanwhile, the first check valve arranged on the output pipeline can prevent softened water in the pump front pipeline from flowing backwards and softening the water supply system, so that the pressure in the pump front pipeline is kept constant, and the possibility of cavitation of the boiler feed water pump is further reduced.
Drawings
In order to more clearly describe the embodiments of the present application or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, and the embodiments of the present invention will be further described in detail with reference to the drawings, wherein
FIG. 1 is a schematic diagram of a boiler feedwater system provided in accordance with an embodiment of the present invention;
fig. 2 is a schematic diagram of installation positions of a boiler, a deaerator and a boiler feed water pump according to an embodiment of the present invention.
In the drawings, the reference numbers:
11. air compressor 12, air supply pipeline 13, first motorised valve 14, pressure sensor
15. Pressure gauge 16, flange 17, gas point 21, surge tank 22 and leather bag
23. Connecting pipeline 24, regulating valve 25, drain pipe 26 and drain valve
31. Pre-pump line 32, first check valve 33, output line 41, first valve
42. Boiler feed water pump 43, third check valve 44, second valve 45, water pipe
46. Water outlet pipe 51, boiler 52, water supply pipe 61 and three-way valve
62. Second check valve 63, return pipe 71, soft water tank 72, third valve
73. A suction pump 74, a fifth check valve 75, a fourth valve 76, a water supply line
77. Third electric valve 78, liquid level meter 81, deaerator 91 and steam delivery pipe
92. A second electric valve 93, a fourth check valve 94, a boiler room 95 and a ground floor
96. Underground one layer
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following detailed description will be provided with reference to specific embodiments.
As shown in fig. 1, the embodiment of the present invention provides a boiler water supply system, which includes a pre-pump pipeline 31 for pumping softened water by a boiler feed water pump, a softened water supply system, and a pressure stabilizer, wherein the pre-pump pipeline is connected with an output pipeline 33 of the softened water supply system; a first check valve 32 is arranged on the output pipeline 33; the pressure stabilizing device is connected with the pre-pump pipeline through a connecting pipeline 23, and an adjusting valve 24 is arranged on the connecting pipeline; the pressure stabilizing device can keep the pressure in the pipeline in front of the pump to be constant. It will be appreciated that demineralized water may flow between the pressure stabilizer and the pre-pump line, thereby maintaining a constant pressure in the pre-pump line.
According to the boiler water replenishing system provided by the embodiment of the invention, the pressure stabilizing device is connected with the pipeline in front of the pump through the connecting pipeline, so that when the water pump is started or the load is suddenly increased, the pressure in the pipeline 31 in front of the pump can be kept constant through the pressure stabilizing device, the negative pressure generated in the pipeline in front of the pump is avoided, and the possibility of cavitation generation of the boiler water feeding pump is reduced; meanwhile, the first check valve 32 arranged on the output pipeline 33 can prevent the softened water in the pipeline in front of the pump from flowing backwards to soften the water supply system, so that the pressure in the pipeline in front of the pump is kept constant, and the possibility of cavitation of the boiler feed water pump is further reduced.
Specifically, the pressure stabilizing device comprises a pressure stabilizing tank 21 and a leather bag 22 positioned in the pressure stabilizing tank, and the leather bag is connected with the pre-pump pipeline through the connecting pipeline. By adopting the scheme, the pressure stabilizing tank is internally provided with the leather bag, the leather bag 22 is filled with water and is communicated with the pipeline in front of the pump through the connecting pipeline, when the boiler water feeding pump is started or the load is suddenly increased, the water in the leather bag 22 enters the pipeline in front of the pump to play a role in stabilizing the pressure in front of the boiler water feeding pump, so that the boiler water feeding pump keeps a certain pressure in front of the pump, namely the pipeline in front of the pump keeps a certain pressure, the negative pressure in the pipeline in front of the pump is avoided, and the probability of cavitation of the boiler water feeding pump is reduced; when the water quantity in the pipeline in front of the pump is larger, part of the water can also enter the leather bag 22 of the pressure stabilizing tank, so that the pressure in the pipeline in front of the pump is relatively stable.
Further, the pressure stabilizing device further comprises an air compressor 11, a first electric valve 13 and a pressure sensor 14, wherein the pressure sensor 14 is arranged on the pressure stabilizing tank 21, the air compressor is connected with the pressure stabilizing tank 21 through an air supply pipeline 12, and the first electric valve 13 is arranged on the air supply pipeline 12, so that compressed air generated by the air compressor 11 is conveyed into the pressure stabilizing tank through the air supply pipeline, and therefore when a boiler feed water pump is started or the load is suddenly increased, water in a compressed air compression leather bag in the pressure stabilizing tank can enter a pipeline in front of the pump to play a role in keeping the pressure in the pipeline in front of the pump to be constant; meanwhile, according to the operation condition, the pressure in the pressure stabilizing tank 21 can be adjusted by adjusting the opening of the first electric valve according to the pressure value detected by the pressure sensor, and if the installation height difference between the deaerator and the boiler feed water pump is small and cannot meet the requirement of preventing cavitation, the pressure in the pipeline in front of the pump can be adjusted by adjusting the pressure of compressed air in the pressure stabilizing tank 21, so that the aim of preventing the boiler feed water pump from frequently generating cavitation is fulfilled. It will be appreciated that the compressed air produced by the air compressor may also be provided to the air consumption point 17 for use; the gas supply line may be connected to the surge tank via a flange 16.
The pressure stabilizing device preferably further comprises a pressure gauge 15 and a drain pipe 25, wherein the pressure gauge is arranged on the pressure stabilizing tank; one end of the drain pipe 25 is connected with the connecting pipeline, and a drain valve 26 is arranged on the drain pipe. Through this scheme, utilize the manometer can be at the on-the-spot direct observation pressure value in the surge tank of boiler room, when boiler feed pump did not start, open the trap, can discharge the partial water in the leather bag of surge tank through the drain pipe, through observing the numerical value change of manometer, judge whether the leather bag damages or leaks etc..
Further, the boiler water charging system provided by the embodiment of the invention further comprises a three-way valve 61, an inlet of the three-way valve is connected with a water outlet pipe of the boiler water feeding pump, a first outlet of the three-way valve is connected with the boiler 51 through a water feeding pipeline 52, and a second outlet of the three-way valve is connected with the pipeline in front of the pump through a water return pipeline 63. By adopting the scheme, because the boiler water feeding pump supplies water at constant pressure but is started and stopped along with the start and stop of the boiler, the water demand of the boiler is adjusted by the three-way electric valve, the flow of the boiler water feeding pump is larger, and when the water demand of the boiler is smaller, the redundant water flows back to the front pump pipeline through the second outlet of the three-way valve and the water return pipeline, so that the water quantity in the front pump pipeline is supplemented, and the water return pipeline has pressure, the pressure of softened water in the front pump pipeline can be increased, namely the pressure at the front end of the water pump is increased, the generation of negative pressure is avoided, and the probability of cavitation of the boiler water feeding pump is effectively reduced. It will be appreciated that the three-way valve may be a three-way electrically operated valve.
In order to avoid backflow of softened water in the boiler 51, a second check valve 62 is provided on the feed water pipe 52.
Specifically, two water pipes 45 are connected in parallel between the pump front pipe 31 and the water outlet pipe 46, and the water pipes are sequentially provided with a first valve 41, the boiler feed water pump 42, a third check valve 43, and a second valve 44, so that one of the two boiler feed water pumps 42 can be selected to operate, and the other boiler feed water pump can be used as a backup, thereby better ensuring the normal operation of the boiler water supply system.
Further, the softened water supply system comprises a softened water tank 71 and two deaerators 81, wherein the softened water tank 71 is respectively connected with the two deaerators through water supply pipelines 76, and the deaerators are also connected with a steam conveying pipe 91; the steam conveying pipe is provided with a second electric valve 92 and a fourth check valve 93; the water supply pipeline 76 is sequentially provided with a third valve 72, a water pump 73, a fifth check valve 74, a fourth valve 75 and a third electric valve 77; the output pipeline is connected with the deaerator; the deaerator is provided with a liquid level meter 78. By adopting the scheme, softened water of the soft water tank sequentially passes through the third valve, the water suction pump, the fifth check valve and the fourth valve and then enters the deaerator through the third electric valve, and the deaerator is respectively provided with a liquid level meter for controlling the liquid level in the deaerator; and steam enters the deaerator through the second electric valve and the fourth check valve, softened water in the deaerator is heated and deaerated by the steam, and the softened water in the deaerator enters a pipeline before the pump through the output pipeline after being heated and deaerated.
As shown in fig. 2, the deaerator 81 and the boiler 51 are arranged on the ground floor 95 of the boiler room 94, and the boiler feed water pump 42 is arranged on the ground floor 96, so that a certain installation height difference is formed between the deaerator and the boiler feed water pump, meanwhile, the building height of the boiler room can be kept consistent, and the problem that the building appearance is influenced due to the fact that the installation positions of the boiler room and the deaerator are locally heightened to form the height difference for preventing cavitation erosion between the deaerator and the boiler feed water pump is avoided.
The pipe diameter of the pre-pump pipe 31 may be preferably larger than that of the output pipe 33, so that it is possible to prevent cavitation caused by vacuum formed at the front end of the boiler feed water pump due to insufficient water amount when the boiler feed water pump is suddenly started or the load is increased.
It can be understood that, in order to effectively reduce the probability of cavitation of the feed pump of the boiler 51, the invention provides the following scheme: firstly, a deaerator is arranged on the ground of a boiler room, a boiler water feeding pump is arranged in a negative underground floor or a pipe gallery, so that a certain height difference is formed between the deaerator and the boiler water feeding pump, a certain pressure is formed at the inlet of the boiler water feeding pump, the cavitation frequency of the boiler water feeding pump is reduced, and the building height of the whole boiler room can be kept consistent; secondly, the inlet pipeline of the boiler feed pump, namely the front pump pipeline 31, is thickened and is provided with a pressure stabilizing tank, compressed air is adopted as gas filled in the pressure stabilizing tank 21, when the boiler feed pump is started or the load is suddenly increased and the water supply amount is increased, the problem that the flow from the deaerator 81 to the inlet of the boiler feed pump cannot follow up due to the large pipe diameter of the front pump pipeline 31 can be relieved, meanwhile, the pressure stabilizing tank can play a role in balancing and stabilizing the inlet pressure of the boiler feed pump, and the pressure stabilizing tank can be timely adjusted to stabilize the pressure according to the cavitation elimination condition of the boiler feed pump; thirdly, the boiler feed water flow is adjusted through the three-way valve, redundant water flows back to the pipeline in front of the pump through the adjusting three-way valve, the inlet pressure of the boiler feed water pump is increased, and therefore the cavitation erosion situation of the boiler feed water pump is eliminated. Therefore, the three methods are simple, practical and good in effect, can be used independently, and can also be used by selecting one or two of the methods; in order to effectively eliminate the cavitation, three methods may be used in combination. The invention can effectively reduce the probability of cavitation of the boiler feed pump, effectively ensure the supply of water to the boiler and prolong the service life of the boiler feed pump.
The above are only preferred embodiments of the present invention, it should be noted that these examples are only for illustrating the present invention and not for limiting the scope of the present invention, and after reading the content of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalents also fall within the scope of the claims appended to the present application.

Claims (10)

1. A boiler water replenishing system is characterized by comprising a pre-pump pipeline, a softened water supply system and a pressure stabilizing device, wherein the pre-pump pipeline is used for pumping softened water by a boiler feed pump and is connected with an output pipeline of the softened water supply system; a first check valve is arranged on the output pipeline; the pressure stabilizing device is connected with the pump front pipeline through a connecting pipeline, and an adjusting valve is arranged on the connecting pipeline; the pressure stabilizing device can keep the pressure in the pipeline in front of the pump to be constant.
2. The boiler water replenishing system according to claim 1, wherein the pressure stabilizing device comprises a pressure stabilizing tank and a bladder located in the pressure stabilizing tank, and the bladder is connected with the pre-pump pipeline through the connecting pipeline.
3. The boiler water replenishing system according to claim 2, wherein the pressure stabilizer further comprises an air compressor, a first electric valve and a pressure sensor, the pressure sensor is arranged on the pressure stabilizer, the air compressor and the pressure stabilizer are connected through an air supply pipeline, and the first electric valve is arranged on the air supply pipeline.
4. The boiler water replenishing system according to claim 2, wherein the pressure stabilizer further comprises a pressure gauge and a drain pipe, and the pressure gauge is arranged on the pressure stabilizer; one end of the drain pipe is connected with the connecting pipeline, and a drain valve is arranged on the drain pipe.
5. The boiler water replenishing system according to claim 1, further comprising a three-way valve, an inlet of the three-way valve being connected to a water outlet pipe of the boiler feed water pump, a first outlet of the three-way valve being connected to the boiler through a feed water pipe, and a second outlet of the three-way valve being connected to the pre-pump pipe through a return water pipe.
6. The boiler feedwater system of claim 5, wherein a second check valve is disposed on the feedwater conduit.
7. The boiler water replenishing system according to claim 5, wherein two water conveying pipelines are arranged in parallel between the pre-pump pipeline and the water outlet pipe, and a first valve, the boiler feed water pump, a third check valve and a second valve are sequentially arranged on the water conveying pipelines.
8. The boiler water replenishing system according to claim 1, wherein the softened water supply system comprises a soft water tank and two deaerators, the soft water tank is respectively connected with the two deaerators through water supply pipelines, and the deaerators are further connected with a steam conveying pipe; a second electric valve and a fourth check valve are arranged on the steam delivery pipe; a third valve, a water suction pump, a fifth check valve, a fourth valve and a third electric valve are sequentially arranged on the water supply pipeline; the output pipeline is connected with the deaerator; and a liquid level meter is arranged on the deaerator.
9. The boiler water replenishing system according to claim 8, wherein the deaerator and the boiler are arranged on one floor above the ground of the boiler room, and the boiler feed water pump is arranged on one floor below the ground.
10. The boiler water replenishing system according to any one of claims 1 to 9, wherein a pipe diameter of the pre-pump pipe is larger than a pipe diameter of the delivery pipe.
CN201911268189.1A 2019-12-11 2019-12-11 Boiler water charging system Active CN110906311B (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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CN110906311B CN110906311B (en) 2021-09-17

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114754293A (en) * 2022-04-28 2022-07-15 广船国际有限公司 Passenger ship volume pump flow control system and method and passenger ship

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CN206514283U (en) * 2016-12-30 2017-09-22 安徽海螺川崎工程有限公司 Waste heat boiler main feed system
CN207144064U (en) * 2017-07-31 2018-03-27 河南中烟工业有限责任公司 A kind of water system stable-pressure device for having maintenance function concurrently
CN207298904U (en) * 2017-09-30 2018-05-01 中国能源建设集团广东省电力设计研究院有限公司 Boiler water filling system
CN110397909A (en) * 2019-08-20 2019-11-01 华能国际电力股份有限公司 Water supply feedforward control system and method based on feed pump recycle valve state

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202048562U (en) * 2011-02-11 2011-11-23 新疆八一钢铁股份有限公司 Improved water supply system of electric-furnace exhaust heat boiler
CN202118887U (en) * 2011-06-25 2012-01-18 田卫东 Energy-saving water feeding system for boiler
CN106149797A (en) * 2015-04-05 2016-11-23 赵洪喜 A kind of high building superposition pressure current stabilization water supply installation
CN206514283U (en) * 2016-12-30 2017-09-22 安徽海螺川崎工程有限公司 Waste heat boiler main feed system
CN207144064U (en) * 2017-07-31 2018-03-27 河南中烟工业有限责任公司 A kind of water system stable-pressure device for having maintenance function concurrently
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CN110397909A (en) * 2019-08-20 2019-11-01 华能国际电力股份有限公司 Water supply feedforward control system and method based on feed pump recycle valve state

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114754293A (en) * 2022-04-28 2022-07-15 广船国际有限公司 Passenger ship volume pump flow control system and method and passenger ship

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