CN113654072A - WGGH (WGGH) environment-friendly and energy-saving comprehensive utilization system, boiler system and operation method thereof - Google Patents
WGGH (WGGH) environment-friendly and energy-saving comprehensive utilization system, boiler system and operation method thereof Download PDFInfo
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- CN113654072A CN113654072A CN202110914623.XA CN202110914623A CN113654072A CN 113654072 A CN113654072 A CN 113654072A CN 202110914623 A CN202110914623 A CN 202110914623A CN 113654072 A CN113654072 A CN 113654072A
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- 238000000034 method Methods 0.000 title claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 436
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 155
- 239000003546 flue gas Substances 0.000 claims abstract description 155
- 230000001105 regulatory effect Effects 0.000 claims abstract description 48
- 239000007789 gas Substances 0.000 claims abstract description 12
- 239000000779 smoke Substances 0.000 claims description 57
- 238000006243 chemical reaction Methods 0.000 claims description 26
- 239000000428 dust Substances 0.000 claims description 16
- 238000006477 desulfuration reaction Methods 0.000 claims description 9
- 230000023556 desulfurization Effects 0.000 claims description 9
- 238000010521 absorption reaction Methods 0.000 claims description 8
- 238000011017 operating method Methods 0.000 claims 1
- 239000002918 waste heat Substances 0.000 abstract description 6
- 238000011084 recovery Methods 0.000 abstract description 4
- 230000001932 seasonal effect Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 27
- 238000010438 heat treatment Methods 0.000 description 15
- 230000009466 transformation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- 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
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/36—Water and air preheating systems
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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
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
-
- 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
- F22D5/18—Controlling water feed or water level; Automatic water feeding or water-level regulators for varying the speed or delivery pressure of feed pumps
-
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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- Engineering & Computer Science (AREA)
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- General Engineering & Computer Science (AREA)
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- Thermal Sciences (AREA)
- Water Supply & Treatment (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention discloses a WGGH (water gas recovery and high-pressure gas recovery) environment-friendly and energy-saving comprehensive utilization system, a boiler system and an operation method thereof, wherein the boiler system comprises a condensed water heat exchanger, and a flue gas cooler and a flue gas reheater which are arranged on a flue of a boiler; the hot water end of the condensate heat exchanger is connected with a hot medium water pipeline of a water side outlet of the flue gas reheater, a condensate booster variable frequency pump is arranged on a cold end water inlet pipe of the condensate heat exchanger, a condensate booster variable frequency pump bypass pipeline is connected in parallel to the condensate booster variable frequency pump, a condensate booster variable frequency pump bypass regulating valve is arranged on the condensate booster variable frequency pump bypass pipeline, and a condensate heat exchanger condensate inlet valve is arranged on an inlet pipeline of the condensate booster variable frequency pump; and a cold end water outlet pipe of the condensed water heat exchanger is provided with a condensed water outlet valve of the condensed water heat exchanger. The invention can reduce the cost, adapt to the high, medium and low load stages of the boiler, is not influenced by the seasonal environment any more, and fully utilizes the waste heat of the flue gas to improve the thermal efficiency of the boiler by modifying the traditional WGGH system.
Description
Technical Field
The invention belongs to the technical field of boiler energy conservation and environmental protection, and relates to a WGGH (water gas) environmental protection and energy conservation comprehensive utilization system, a boiler system and an operation method thereof.
Background
With the implementation of the coal-electricity energy-saving emission-reducing upgrading and transforming action plan, most coal-electricity units are transformed into energy-saving emission-reducing units, and a low-temperature closed heating medium water pipe type heat exchanger (WGGH) system is also an important loop. The existing low-temperature closed heating medium water pipe type heat exchanger (WGGH) system comprises a flue gas cooler, an electric dust remover, a flue gas reheater, a circulating pump, an auxiliary steam heater and the like, wherein flue gas discharged from an air preheater firstly enters the flue gas cooler, then passes through the dust remover and a desulfurization device, and finally is discharged into the atmosphere through the flue gas reheater and a chimney. The temperature of the smoke at the outlet of the smoke cooler must be reduced to 90 ℃ so as to ensure that the electric dust remover operates in a low-temperature state and improve the dust removal efficiency; the temperature of the smoke at the outlet of the smoke heater is heated to more than 70 ℃ so as to prevent the corrosion of a flue and a chimney, improve the lifting height of the smoke, enhance the diffusion of the smoke and reduce the landing concentration of main pollutants; the problems of chimney rain around the chimney, white smoke emission of the chimney and the like are solved.
With the use of the existing low-temperature closed heat medium water pipe type heat exchanger (WGGH) system, when the boiler is in a low-load stage, the temperature of smoke at the outlet of a smoke heater cannot be heated to more than 70 ℃, so that downstream equipment is easy to corrode; when the boiler is in a high-load stage, the temperature of the smoke at the outlet of the smoke heater exceeds more than 100 ℃, so that heat loss is caused, and the energy-saving requirement cannot be met. The existing low-temperature closed heating medium water pipe type heat exchanger (WGGH) system cannot meet the requirements of the whole load stage of a boiler in the operation process, is greatly influenced by seasonal environment and has high system transformation cost. Therefore, how to adapt the operation of a low-temperature closed heating medium water pipe type heat exchanger (WGGH) system to the high, medium and low load stages of a boiler, fully utilize the waste heat of flue gas, improve the thermal efficiency of the boiler and reduce the system transformation cost is a technical problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
The invention aims to provide a WGGH environment-friendly and energy-saving comprehensive utilization system, a boiler system and an operation method thereof, aiming to solve the problems in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a WGGH environmental protection and energy saving comprehensive utilization system comprises a condensed water heat exchanger, a flue gas cooler and a flue gas reheater, wherein the flue gas cooler and the flue gas reheater are arranged on a flue of a boiler;
the hot water end of the condensate heat exchanger is connected with a hot medium water pipeline of a water side outlet of the flue gas reheater, a condensate booster variable frequency pump is arranged on a cold end water inlet pipe of the condensate heat exchanger, a condensate booster variable frequency pump bypass pipeline is connected in parallel to the condensate booster variable frequency pump, a condensate booster variable frequency pump bypass regulating valve is arranged on the condensate booster variable frequency pump bypass pipeline, and a condensate heat exchanger condensate inlet valve is arranged on an inlet pipeline of the condensate booster variable frequency pump; and a cold end water outlet pipe of the condensed water heat exchanger is provided with a condensed water outlet valve of the condensed water heat exchanger.
Preferably, two condensation water booster variable frequency pumps are arranged and connected in parallel.
Preferably, the WGGH environment-friendly and energy-saving comprehensive utilization system further comprises a flue gas reheater hot medium bypass pipeline, one end of the flue gas reheater hot medium bypass pipeline is communicated with a hot medium water pipeline at an outlet of a water side of the flue gas reheater, the other end of the flue gas reheater hot medium bypass pipeline is communicated with a hot medium water pipeline at an inlet of the water side of the flue gas reheater, and a flue gas reheater hot medium water bypass regulating valve is mounted on the flue gas reheater hot medium water bypass pipeline.
Preferably, a water side inlet of the flue gas cooler is connected with a water side outlet of the flue gas reheater through a first hot medium water pipeline, and a water side outlet of the flue gas cooler is connected with a water side inlet of the flue gas reheater through a second hot medium water pipeline;
the hot water end of the condensed water heat exchanger is connected with a first hot medium water pipeline;
still be equipped with steady voltage water tank, heat medium water circulation variable frequency pump and flue gas cooler water side inlet valve on the first heat medium water pipeling, condensate water heat exchanger, steady voltage water tank, heat medium water circulation variable frequency pump and flue gas cooler water side inlet valve set gradually along the rivers direction on first heat medium water pipeling, are connected with the frequency conversion water supply pump on the steady voltage water tank.
Preferably; the second heat medium water pipeline is provided with a heat medium water steam heater and a flue gas reheater water side inlet regulating valve, the heat medium water steam heater and the flue gas reheater water side inlet regulating valve are sequentially arranged on the second heat medium water pipeline along the water flow direction, the second heat medium water pipeline is connected with a heat medium water heater bypass valve which is connected with the heat medium water steam heater in parallel, and an inlet and an outlet of the heat medium water steam heater are respectively provided with a heat medium water heater water side inlet valve and a heat medium water heater water side outlet valve.
Preferably, the two ends of the flue gas reheater heat medium water bypass pipeline are respectively connected with the first heat medium water pipeline and the second heat medium water pipeline, the connection point of the flue gas reheater heat medium water bypass pipeline and the first heat medium water pipeline is located between the heat inlet of the condensate heat exchanger and the water side outlet of the flue gas reheater, and the connection point of the flue gas reheater heat medium water bypass pipeline and the second heat medium water pipeline is located between the outlet of the heat medium water steam heater and the water side inlet regulating valve of the flue gas reheater.
The invention also provides a boiler system, which comprises an air preheater, a flue, a dust remover, a desulfurization absorption tower and the WGGH environment-friendly and energy-saving comprehensive utilization system, wherein the air preheater, the flue gas cooler, the dust remover, the desulfurization absorption tower and the flue gas reheater are sequentially arranged along the flow direction of flue gas in the flue, and a cold end inlet and a hot cold end outlet of the condensed water heat exchanger are connected with a pipeline of a low-pressure heater of the boiler system.
Preferably, a cold end inlet of the condensed water heat exchanger is arranged at an inlet of a No. eight low-pressure heater of the boiler system, and a hot cold end outlet of the condensed water heat exchanger is arranged at an inlet of a No. six low-pressure heater of the boiler system.
The operation method of the boiler system according to the present invention is characterized by comprising the steps of:
before the WGGH environment-friendly and energy-saving comprehensive utilization system is started, the condensate water booster variable frequency pump is adjusted to be in a stop state, a condensate water inlet valve of a condensate water heat exchanger and a condensate water outlet valve of the condensate water heat exchanger are opened, and a bypass adjusting valve of the condensate water booster variable frequency pump is closed;
when the WGGH environment-friendly and energy-saving comprehensive utilization system operates, condensed water in a low-pressure heater pipeline enters a cold water end of a condensed water heat exchanger through a cold end water inlet pipe of the condensed water heat exchanger and a condensed water booster variable-frequency pump to absorb heat, and then flows back to the low-pressure heater pipeline from a cold end water outlet pipe of the condensed water heat exchanger, so that the condensed water in the low-pressure heater pipeline is heated, and the temperature of the condensed water entering a boiler is increased;
when the load of the boiler is reduced, the output of the condensed water booster frequency conversion pump is gradually reduced to reduce the flow of the condensed water entering the condensed water heat exchanger, so that the temperature of the smoke at the outlet of the smoke cooler is maintained at 90-95 ℃ and the temperature of the smoke at the outlet of the smoke reheater is maintained at 70-75 ℃;
when the load of the boiler is reduced to the extent that the output of the condensed water booster frequency conversion pump cannot be reduced to maintain the temperature of the smoke at the outlet of the smoke cooler to be 90-95 ℃ and the temperature of the smoke at the outlet of the smoke reheater to be 70-75 ℃, the condensed water booster frequency conversion pump is stopped to be operated, and the opening of the bypass regulating valve of the condensed water booster frequency conversion pump is regulated to regulate the amount of condensed water entering the condensed water heat exchanger so as to maintain the temperature of the smoke at the outlet of the smoke cooler to be 90-95 ℃ and the temperature of the smoke at the outlet of the smoke reheater to be 70-75 ℃.
Preferably, when the flue gas reheater hot medium water bypass pipeline and the flue gas reheater hot medium water bypass regulating valve are arranged, and the boiler load is more than 80%: the bypass regulating valve of the condensed water booster frequency conversion pump is in a closed state, the temperature of the smoke at the outlet of the smoke cooler is controlled to be 90-95 ℃, the flow of the heat medium entering the water side of the smoke reheater is regulated through the opening degree of the heat medium bypass regulating valve of the smoke reheater and the water side inlet regulating valve of the smoke reheater, and the temperature of the smoke at the outlet of the smoke reheater is controlled to be 70-75 ℃.
The invention has the following beneficial effects:
the WGGH environment-friendly and energy-saving comprehensive utilization system is used for absorbing the waste heat of a hot medium water system for heating condensed water when the temperature of smoke at the outlet of a smoke reheater is higher than 80 ℃ by connecting the hot water end of a condensed water heat exchanger with a hot medium water pipeline at the outlet of the smoke reheater. Water inlet at the cold end of the condensed water heat exchanger is connected with the inlet of the eighth low-pressure heater, and water outlet at the cold end of the condensed water heat exchanger can be connected to a pipeline of the low-pressure heater of the boiler system and the water temperature of the low-pressure heater, so that the steam consumption of the low-pressure heater is reduced, and the heat efficiency is improved. Through setting up condensate water heat exchanger condensate water inlet valve, condensate water booster frequency conversion pump bypass pipeline, condensate water booster frequency conversion pump, condensate water heat exchanger condensate water outlet valve, can heat the condensate water, reduce low pressure heater steam consumption, the thermal efficiency is improved. The condensate water booster frequency conversion pump can provide kinetic energy for condensate water entering the condensate water heat exchanger, meets the requirement that the boiler load is in a high-load stage and when the exhaust gas temperature of the outlet of the flue gas reheater is ensured to be 70 ℃, recovers heat energy to the maximum extent, heats the condensate water temperature, further reduces the steam consumption of the low-pressure heater, and improves the heat efficiency.
Furthermore, two condensate booster frequency conversion pumps are arranged and connected in parallel, so that the adjusting range of the cold end inlet flow of the condensate heat exchanger can be enlarged, and the requirements on the single condensate booster frequency conversion pump and the cost are reduced.
Furthermore, by arranging the flue gas reheater hot medium water bypass pipeline and the flue gas reheater hot medium water bypass regulating valve, when the boiler load is more than 80%, the flow of the flue gas reheater water side hot medium water entering can be regulated by regulating the opening of the flue gas reheater hot medium water bypass regulating valve and an existing flue gas reheater water side inlet regulating valve, so that the outlet flue gas temperature of the reheater is controlled at the preset temperature.
Furthermore, the cold end inlet of the condensate heat exchanger is arranged at the inlet of an eighth low-pressure heater of the boiler system, the outlet of the hot cold end of the condensate heat exchanger is arranged at the inlet of a sixth low-pressure heater of the boiler system, 35-38 ℃ condensate at the inlet of the eighth low-pressure heater is heated to 95-100 ℃ through the condensate heat exchanger, 95-100 ℃ condensate at the outlet of the condensate heater and 85-90 ℃ condensate at the outlet of a seventh low-pressure heater can be mixed and then enter the sixth low-temperature heater, the temperature of the condensate entering the boiler is improved, and the coal consumption of the boiler is reduced.
Drawings
FIG. 1 is a schematic structural view of a boiler system according to the present invention.
Wherein, 1 is a boiler, 2 is an air preheater, 3 is a flue, 4 is a flue gas cooler, 5 is a dust remover, 6 is a desulfurization absorption tower, 7 is a flue gas reheater, 8 is a chimney, 9 is a flue gas reheater water side inlet regulating valve, 10 is a flue gas reheater heat medium water bypass regulating valve, 11 is a flue gas reheater heat medium water bypass pipeline, 12 is a heat medium water pipeline, 13 is a condensed water heat exchanger, 14 is a condensed water heat exchanger condensed water outlet valve, 15 is a fifth low-pressure heater, 16 is a sixth low-pressure heater, 17 is a seventh low-pressure heater, 18 is an eighth low-pressure heater, 19 is a condensed water pipeline, 20 is a condensed water heat exchanger condensed water inlet valve, 23 is a condensed water booster frequency conversion pump bypass regulating valve, 24 is a condensed water booster frequency conversion pump bypass pipeline, 25 is a condensed water booster frequency conversion pump, 26 is a water circulation frequency conversion pump, 27 is a pressure stabilizing water tank, 28 is a variable frequency water replenishing pump, 29 is a water side inlet valve of a flue gas cooler, 30 is a water side inlet valve of a hot water heater, 31 is a hot water steam heater, 32 is a hot water heater water side outlet valve, and 33 is a hot water heater bypass valve.
FIG. 2 is a schematic diagram of a single-layer module structure in a flue gas cooler and a flue gas reheater in accordance with an embodiment of the present invention.
Wherein 34 is a module drain valve, 35 is an inlet shutoff valve, 36 is a module inlet header, 37 is a vent valve, 38 is a module outlet header, and 39 is a module outlet shutoff valve.
Fig. 3 is a schematic structural diagram of a flue gas cooler in an embodiment of the invention, wherein 29 is an inlet heating medium water regulating valve of the flue gas cooler, 40 is a first-layer module, 41 is a second-layer module, 43 is a third-layer module, and 44 is a fourth-layer module.
Fig. 4 is a schematic structural diagram of a flue gas reheater according to an embodiment of the present invention, where 9 is a flue gas reheater water-side inlet regulating valve, 45 is a first-layer module, 46 is a second-layer module, 47 is a third-layer module, 48 is a fourth-layer module, 49 is a fifth-layer module, 50 is a sixth-layer module, 51 is a seventh-layer module, 52 is an eighth-layer module, and 53 is a ninth-layer module.
Detailed Description
The invention is described in further detail below with reference to the following figures and examples:
referring to fig. 1, the boiler system with WGGH energy-saving comprehensive utilization system of the invention comprises a flue gas cooler 4, a flue gas cooler water side inlet valve 29, a flue gas reheater 7, a flue gas reheater water side inlet regulating valve 9, a heat medium water pipeline 12, a flue gas reheater heat medium water bypass regulating valve 10, a flue gas reheater heat medium water bypass pipeline 11, a heat medium water circulation variable frequency pump 26, a variable frequency water replenishing pump 28, a surge water tank 27, a condensed water pipeline 19, a condensed water heat exchanger condensed water inlet valve 20, a condensed water booster variable frequency pump bypass regulating valve 23, a condensed water booster variable frequency pump bypass pipeline 24, a condensed water booster variable frequency pump 25, a condensed water heat exchanger 13, a condensed water heat exchanger condensed water outlet valve 14, a heat medium water steam heater 31, an air preheater 2, a flue gas cooler 4, a dust remover 5, a desulfurization absorption tower 6, along the flow direction of flue gas in a flue 3, The flue gas reheater 7 and the chimney 8 are arranged in sequence, and the flue gas cooler 4 is arranged between the air preheater 2 and the dust remover 5; the flue gas reheater 7 is arranged between the desulfurization absorption tower 6 and the chimney 8; the heat medium water circulation variable frequency pump 26 is arranged at a heat medium water pipeline of a water side inlet of the flue gas cooler 4; the heating medium water vapor heater 31 is arranged at the outlet heating medium water pipeline of the water side of the flue gas cooler 4; a reheater hot medium water bypass pipeline 11 is arranged at a hot water end inlet of a condensed water heat exchanger 13 at a water side inlet of the flue gas reheater 7; the flue gas reheater hot medium water bypass regulating valve 10 is arranged at a flue gas reheater hot medium water bypass pipeline 11; the variable-frequency water replenishing pump 28 and the pressure stabilizing water tank 27 are sequentially arranged at an inlet heat medium water pipeline of the heat medium water circulation variable-frequency pump 26, and the variable-frequency water replenishing pump 28 is connected with the pressure stabilizing water tank 27; the inlet water of the cold end of the condensed water heat exchanger 13 is arranged at the inlet of a No. eight low-pressure heater 18 of the boiler system, and the outlet water of the cold end of the condensed water heat exchanger 13 is arranged at the inlet of a No. six low-pressure heater 16; the hot water end of the condensed water heat exchanger 13 is arranged at the outlet hot medium water pipeline 12 of the flue gas cooler; the condensed water booster variable frequency pump 25 is arranged at the water inlet of the cold end of the condensed water heat exchanger 13; a condensed water booster variable frequency pump bypass pipeline 24 and a condensed water booster variable frequency pump bypass regulating valve 23 are arranged at the inlet and the outlet of a condensed water booster variable frequency pump 25; the condensed water booster pump bypass regulating valve 23 is arranged at the condensed water booster frequency conversion pump bypass pipeline 24; the condensed water recycling pipeline 22 is arranged at the outlet of the cold water end of the condensed water heat exchanger 13 and the condensed water inlet valve 20 of the condensed water heat exchanger; a condensate recirculation regulating valve 23 is provided at the condensate recirculation pipe 24. A flue gas cooler inlet heat medium water regulating valve 29 is arranged on a water side inlet heat medium water pipeline of the flue gas cooler 4. Two condensed water booster frequency conversion pumps 25 are arranged at the cold water end inlets of the condensed water heat exchangers 13.
As a preferred embodiment of the present invention, referring to fig. 3 and 4, the flue gas cooler 4 and the flue gas reheater 7 are provided with a plurality of modules in the direction perpendicular to the height direction of the flue gas section, and referring to fig. 2, each module is provided with an inlet shutoff valve 35, a module outlet shutoff valve 39, a module inlet header 36, a module outlet header 38, a module drain valve 34, and a drain valve 37; the flue gas cooler 4 comprises 5 modules in the direction vertical to the height direction of the flue gas section, namely a first layer module 40, a second layer module 41, a third layer module 42, a fourth layer module 43 and a fifth layer module 44; the flue gas reheater 7 is composed of 9 modules in the vertical flue gas section height direction, namely a first layer module 45, a second layer module 46, a third layer module 47, a fourth layer module 48, a fifth layer module 49, a sixth layer module 50, a seventh layer module 51, an eighth layer module 52 and a ninth layer module 53.
The working method of the natural gas boiler system in the embodiment includes the following processes:
before the WGGH energy-saving comprehensive utilization system is started, a frequency conversion circulating pump is kept at a stop state of 26, a flue gas cooler water side inlet valve 29, a flue gas reheater water side inlet regulating valve 9, a hot medium water heater bypass valve 33, all module inlet shutoff valves 35, module outlet shutoff valves 39 and module exhaust valves 37 are opened, a hot medium water heater water side inlet valve 30 and a hot medium water heater water side outlet valve 32 are closed, demineralized water is injected into a hot medium water pipeline 12 through a frequency conversion water supplementing pump 28, and all module exhaust valves 35 are closed after water is filled; and keeping the stop state of the condensed water booster frequency conversion pump 25, opening a condensed water inlet valve 20 of the condensed water heat exchanger and a condensed water outlet valve 14 of the condensed water heat exchanger, and closing a bypass regulating valve 23 of the condensed water booster frequency conversion pump.
When the WGGH energy-saving comprehensive utilization system operates, flue gas generated by boiler combustion carries a large amount of heat to flow through the air preheater 2, the flue gas cooler gas side 4, the dust remover 5, the desulfurization absorption tower 6 and the flue gas reheater 7, and finally is discharged to the atmosphere through the chimney 8; the desalted water in the heat medium water pipeline 12 is powered by a heat medium water circulation variable frequency pump 26, firstly enters the water side of the flue gas cooler 4 to absorb heat, then enters a flue gas reheater 7 to heat purified flue gas, then enters the hot water end of the condensed water heat exchanger 13, and then directly enters the hot water end of the condensed water heat exchanger 13, and finally returns to the inlet of the heat medium water circulation variable frequency pump 26 to form heat medium water closed circulation; the condensed water in the condensed water pipeline 19 is powered by a condensed water booster variable frequency pump 25 to enter a cold water end of the condensed water heat exchanger 13 to absorb heat, when the temperature of the exhaust gas at the outlet of the flue gas reheater is higher than 70 ℃, the condensed water heat exchanger 13 absorbs the redundant heat of the heat medium water system to heat the condensed water, and a part of the heated condensed water enters the No. six low-pressure heater 16 to improve the temperature of the condensed water entering the boiler.
When the boiler load is more than 80%, the heat medium water flow entering the water side of the flue gas cooler 4 is adjusted by adjusting the working frequency of the heat medium water circulation variable frequency pump 26, and the condensed water flow at the water side of the condensed water heat exchanger is controlled by adjusting the working frequency of the condensed water booster variable frequency pump 25, so that the flue gas temperature at the outlet of the flue gas cooler is controlled at 90 ℃. Regulating the flow of the water side heating medium entering the flue gas reheater 7 by regulating the opening degree of a flue gas reheater heating medium water bypass regulating valve 10 and a flue gas reheater water side inlet regulating valve 9 on a flue gas reheater heating medium water bypass pipeline 11, and controlling the temperature of outlet flue gas of the reheater at 70 ℃; the condensed water enters the cold water end of the condensing heat exchanger 13, is heated to 98 ℃, then enters the No. six low-pressure heater 16, and the bypass regulating valve 23 of the condensed water booster variable frequency pump is in a closed state.
Firstly, gradually reducing the working frequency and the number of running frequency of a condensate water booster variable frequency pump 25 to adjust the flow of condensate water entering a condensate water heat exchanger to ensure that the temperature of flue gas at the outlet of a flue gas cooler is 90 ℃ and the temperature of flue gas at the outlet of a reheater is 70 ℃ along with the reduction of the load of a boiler; and (3) stopping the condensed water booster variable frequency pump 25 along with the reduction of the load of the boiler again, adjusting the opening degree of the bypass adjusting valve 23 of the condensed water booster variable frequency pump to adjust the condensed water entering the condensed water heat exchanger, and enabling the condensed water to enter the condensed water heat exchanger 13 by providing kinetic energy through the condensed water system.
Taking a 1000MW coal-fired power plant on a coastal area to transform the WGGH energy-saving comprehensive utilization system, the operation of the original WGGH system is greatly influenced by the change of the load of a boiler, and when the boiler is in a low-load stage, the temperature of smoke at the outlet of a smoke heater cannot be heated to more than 70 ℃, so that downstream equipment is easy to corrode; when the boiler is in a high-load stage, the temperature of the smoke at the outlet of the smoke heater exceeds more than 100 ℃, so that heat loss is caused, and the energy-saving requirement cannot be met. According to the transformation, a condensate water heat exchanger is arranged on an original WGGH system, and a WGGH hot medium water system is connected with the condensate water system through the condensate water heat exchanger, so that the transformation cost is reduced; the temperature of a heating medium at the inlet of the cold end of the flue gas cooler is adjusted by arranging a condensed water booster variable frequency pump and a condensed water booster variable frequency pump bypass adjusting valve, so that when the boiler is in low, medium and high load stages, the temperature of flue gas at the outlet of the flue gas cooler is maintained at 90-95 ℃, and the best working efficiency of the dust remover is ensured; the outlet flue gas temperature of the flue gas heater is adjusted through the flue gas reheater heating medium water bypass adjusting valve, so that when the boiler is in low, medium and high load stages, the outlet flue gas temperature of the flue gas cooler is maintained at 70-75 ℃, under the condition that downstream equipment is not corroded, the flue gas waste heat is recovered, and the boiler thermal efficiency is improved.
The 1000MW coal-fired power plant reformed by the WGGH energy-saving comprehensive utilization system can heat 645-655 t/h of condensed water from 35-38 ℃ to 95-100 ℃ while ensuring that all indexes meet the requirements, and improves the temperature of the condensed water entering a boiler. The improved WGGH energy-saving comprehensive utilization system has the characteristics of low cost, short investment recovery period, waste heat recovery, improvement on the thermal efficiency of the boiler and the like.
In summary, the boiler system with the WGGH energy-saving comprehensive utilization system is used for absorbing the waste heat of the hot water system for heating the condensed water when the temperature of the flue gas at the outlet of the flue gas reheating gas is higher than 80 ℃ by connecting the hot water end of the condensed water heat exchanger with the hot water pipeline at the outlet of the flue gas reheater. Through with condensate heat exchanger cold junction water inflow and No. eight low pressure feed water heater entry linkage, the condensate heat exchanger cold junction goes out water and is connected with No. six low pressure feed water heater entry and can be used for heating the condensate with the energy when the condensate heat exchanger heat transfer, and the condensate that is heated gets into No. six low pressure feed water heater, improves No. six low pressure feed water heater's warm water, reduces No. six low pressure feed water heater steam consumption, the increase of thermal efficiency.
By arranging the condensed water inlet valve 20 of the condensed water heat exchanger, the condensed water booster variable frequency pump bypass pipeline 24, the condensed water booster variable frequency pump 25, the condensed water heat exchanger 13 and the condensed water outlet valve 14 of the condensed water heat exchanger, the condensed water can be introduced from the eighth low-pressure heater to the sixth low-pressure heater after being heated. The condensate water booster frequency conversion pump provides kinetic energy for condensate water entering the condensate water heat exchanger, and the requirements of recovering heat energy to the maximum degree when the exhaust gas temperature at the outlet of the flue gas reheater is ensured to be 70 ℃ when the boiler load is in a high-load stage are met, the temperature of the condensate water is heated, the steam consumption of a No. six low-pressure heater is reduced, and the heat efficiency is improved.
Through setting up condensate water booster frequency conversion pump bypass governing valve 23 and condensate water booster frequency conversion pump bypass pipeline 24, can introduce the condensate water from No. eight low pressure feed water heater to condensate water heat exchanger 13 hot back reentrant No. six low pressure feed water heater again, condensate water booster frequency conversion pump bypass governing valve rely on the condensate water system to provide kinetic energy and adjust the condensate water flow that gets into the condensate water heat exchanger, when guaranteeing flue gas reheater export exhaust gas temperature 70 ℃ when satisfying boiler load and being in middle and low-load stage, the maximum heat energy of retrieving heats the condensate water temperature, reduces No. six low pressure feed water heater steam consumptions, improves the thermal efficiency.
By arranging the flue gas cooler 4, the flue gas reheater 7, the heat medium water pipeline 12 and the heat medium water circulation variable frequency pump 26, the heat medium water variable frequency pump provides kinetic energy for heat medium water, and the heat medium water can flow into the flue gas cooler to absorb heat energy, so that the temperature of flue gas at the inlet of the dust remover is reduced to 90 ℃, and the dust removal efficiency of the dust remover is improved; the heat medium water after absorbing the heat energy enters a flue gas reheater to release the heat energy to heat the flue gas at the outlet of the flue gas reheater to 70 ℃ so as to prevent the corrosion of a flue and a chimney and improve the lifting height of the flue gas, enhance the diffusion of the flue gas and reduce the landing concentration of main pollutants; the problems of chimney rain around the chimney, white smoke emission of the chimney and the like are solved.
Claims (10)
1. A WGGH environment-friendly and energy-saving comprehensive utilization system is characterized by comprising a condensed water heat exchanger (13), a flue gas cooler (4) and a flue gas reheater (7), wherein the flue gas cooler (4) and the flue gas reheater are arranged on a flue (3) of a boiler (1); the hot water end of the condensed water heat exchanger (13) is connected with a hot medium water pipeline of a water side outlet of the flue gas reheater (7), a condensed water booster variable frequency pump (25) is arranged on a cold end water inlet pipe of the condensed water heat exchanger (13), a condensed water booster variable frequency pump bypass pipeline (24) is connected in parallel to the condensed water booster variable frequency pump (25), a condensed water booster variable frequency pump bypass regulating valve (23) is arranged on the condensed water booster variable frequency pump bypass pipeline (24), and a condensed water heat exchanger condensed water inlet valve (20) is arranged on an inlet pipeline of the condensed water booster variable frequency pump (25); a condensed water outlet valve (14) of the condensed water heat exchanger is arranged on a cold end water outlet pipe of the condensed water heat exchanger (13).
2. The WGGH environment-friendly and energy-saving comprehensive utilization system as claimed in claim 1, wherein two condensate water booster variable frequency pumps (25) are provided, and the two condensate water booster variable frequency pumps (25) are connected in parallel.
3. The WGGH environment-friendly and energy-saving comprehensive utilization system according to claim 1, further comprising a flue gas reheater hot medium water bypass pipeline (11), wherein one end of the flue gas reheater hot medium water bypass pipeline (11) is communicated with a hot medium water pipeline at a water side outlet of the flue gas reheater (7), the other end of the flue gas reheater hot medium water bypass pipeline (11) is communicated with a hot medium water pipeline at a water side inlet of the flue gas reheater (7), and a flue gas reheater hot medium water bypass regulating valve (10) is installed on the flue gas reheater hot medium water bypass pipeline (11).
4. The WGGH environment-friendly and energy-saving comprehensive utilization system according to claim 3, wherein a water side inlet of the flue gas cooler (4) is connected with a water side outlet of the flue gas reheater (7) through a first hot medium water pipeline, and a water side outlet of the flue gas cooler (4) is connected with a water side inlet of the flue gas reheater (7) through a second hot medium water pipeline;
the hot water end of the condensed water heat exchanger (13) is connected with a first hot medium water pipeline;
still be equipped with steady voltage water tank (27), hot media water circulation variable frequency pump (26) and gas cooler water side entry valve (29) on first hot media water pipe, condensate water heat exchanger (13), steady voltage water tank (27), hot media water circulation variable frequency pump (26) and gas cooler water side entry valve (29) set gradually along the rivers direction on first hot media water pipe, are connected with variable frequency water supply pump (28) on steady voltage water tank (27).
5. The WGGH environment-friendly and energy-saving comprehensive utilization system of claim 4, wherein;
be equipped with heat medium steam heater (31) and flue gas reheater water side inlet governing valve (9) on the second heat medium water pipeline, heat medium steam heater (31) and flue gas reheater water side inlet governing valve (9) set gradually along the rivers direction on the second heat medium water pipeline, be connected with heat medium water heater bypass valve (33) parallelly connected with heat medium steam heater (31) on the second heat medium water pipeline, the entry and the export of heat medium steam heater (31) are equipped with heat medium water heater water side inlet valve (30) and heat medium water heater water side outlet valve (32) respectively.
6. The WGGH environment-friendly and energy-saving comprehensive utilization system according to claim 5, wherein both ends of the flue gas reheater hot medium water bypass pipeline (11) are connected with the first hot medium water pipeline and the second hot medium water pipeline respectively, the connection point of the flue gas reheater hot medium water bypass pipeline (11) and the first hot medium water pipeline is located between the hot inlet of the condensate heat exchanger (13) and the water side outlet of the flue gas reheater (7), and the connection point of the gas reheater hot medium water bypass pipeline (11) and the second hot medium water pipeline is located between the outlet of the hot medium steam heater (31) and the flue gas reheater water side inlet regulating valve (9).
7. A boiler system, characterized in that, comprising an air preheater (2), a flue (3), a dust remover (5), a desulfurization absorption tower (6) and the WGGH environment-friendly and energy-saving comprehensive utilization system as claimed in any one of claims 1 to 6, along the flow direction of flue gas in the flue (3), the air preheater (2), the flue gas cooler (4), the dust remover (5), the desulfurization absorption tower (6) and the flue gas reheater (7) are arranged in sequence, and a cold end inlet and a hot cold end outlet of a condensed water heat exchanger (13) are connected to a pipeline of a low-pressure heater of the boiler system.
8. A boiler system according to claim 7, characterized in that the cold inlet of the condensate heat exchanger (13) is arranged at the inlet of the eight low pressure heater (18) of the boiler system and the hot cold outlet of the condensate heat exchanger (13) is arranged at the inlet of the six low pressure heater (16) of the boiler system.
9. A method of operating a boiler system according to claim 7 or 8, comprising the steps of:
before the WGGH environment-friendly and energy-saving comprehensive utilization system is started, the condensed water booster variable frequency pump (25) is adjusted to be in a stop state, a condensed water inlet valve (20) of the condensed water heat exchanger and a condensed water outlet valve (14) of the condensed water heat exchanger are opened, and a condensed water booster variable frequency pump bypass adjusting valve (23) is closed;
when the WGGH environment-friendly and energy-saving comprehensive utilization system operates, condensed water in a low-pressure heater pipeline enters a cold water end of a condensed water heat exchanger (13) through a cold end water inlet pipe of the condensed water heat exchanger and a condensed water boosting variable frequency pump (25) to absorb heat, and then flows back to the low-pressure heater pipeline from a cold end water outlet pipe of the condensed water heat exchanger (13), so that the condensed water in the low-pressure heater pipeline is heated, and the temperature of the condensed water entering a boiler is increased;
when the load of the boiler is reduced, the output of the condensed water booster frequency conversion pump (25) is gradually reduced to reduce the flow rate of the condensed water entering the condensed water heat exchanger (13), so that the smoke temperature at the outlet of the smoke cooler (4) is maintained at 90-95 ℃ and the smoke temperature at the outlet of the smoke reheater (7) is maintained at 70-75 ℃;
when the load of the boiler is reduced to the extent that the output of the condensed water booster variable frequency pump (25) cannot be reduced to maintain the temperature of the smoke at the outlet of the smoke cooler (4) at 90-95 ℃ and the temperature of the smoke at the outlet of the smoke reheater (7) at 70-75 ℃, the condensed water booster variable frequency pump (25) is stopped, and the opening of the condensed water booster variable frequency pump bypass regulating valve (23) is regulated to regulate the amount of condensed water entering the condensed water heat exchanger (13) to maintain the temperature of the smoke at the outlet of the smoke cooler (4) at 90-95 ℃ and the temperature of the smoke at the outlet of the smoke reheater (7) at 70-75 ℃.
10. The operating method of the boiler system according to claim, wherein when the flue gas reheater hot water bypass line (11) and the flue gas reheater hot water bypass regulating valve (10) are provided and the boiler load is 80% or more: the condensed water booster variable frequency pump bypass regulating valve (23) is in a closed state, the temperature of the smoke at the outlet of the smoke cooler (4) is controlled to be 90-95 ℃, the flow of the heat medium water entering the water side of the smoke reheater (7) is regulated through the opening of the heat medium water bypass regulating valve (10) of the smoke reheater and the water side inlet regulating valve (9) of the smoke reheater, and the temperature of the smoke at the outlet of the smoke reheater (7) is controlled to be 70-75 ℃.
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