CN113654072B - WGGH environment-friendly and energy-saving comprehensive utilization system, boiler system and operation method thereof - Google Patents
WGGH environment-friendly and energy-saving comprehensive utilization system, boiler system and operation method thereof Download PDFInfo
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- CN113654072B CN113654072B CN202110914623.XA CN202110914623A CN113654072B CN 113654072 B CN113654072 B CN 113654072B CN 202110914623 A CN202110914623 A CN 202110914623A CN 113654072 B CN113654072 B CN 113654072B
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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 422
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 153
- 239000003546 flue gas Substances 0.000 claims abstract description 153
- 230000001105 regulatory effect Effects 0.000 claims abstract description 63
- 238000009833 condensation Methods 0.000 claims abstract description 51
- 230000005494 condensation Effects 0.000 claims abstract description 51
- 239000000779 smoke Substances 0.000 claims description 60
- 238000010438 heat treatment Methods 0.000 claims description 39
- 239000000428 dust Substances 0.000 claims description 16
- 238000010521 absorption reaction Methods 0.000 claims description 8
- 238000006477 desulfuration reaction Methods 0.000 claims description 8
- 230000023556 desulfurization Effects 0.000 claims description 8
- 230000007613 environmental effect Effects 0.000 claims description 5
- 238000004134 energy conservation Methods 0.000 claims description 4
- 230000008676 import Effects 0.000 claims 2
- 230000003020 moisturizing effect Effects 0.000 claims 1
- 239000002918 waste heat Substances 0.000 abstract description 6
- 230000001932 seasonal effect Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 27
- 230000000087 stabilizing effect Effects 0.000 description 7
- 230000001502 supplementing effect Effects 0.000 description 5
- 239000003245 coal Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000009466 transformation 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
- 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
- 230000009467 reduction Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
Classifications
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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
-
- 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
-
- 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
-
- 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
-
- 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)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Water Supply & Treatment (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention discloses a WGGH environment-friendly and energy-saving comprehensive utilization system, a boiler system and an operation method thereof, wherein the system comprises a condensate 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 condensation water heat exchanger is connected with a hot medium water pipeline at the water side outlet of the flue gas reheater, a condensation water supercharging variable frequency pump is arranged on a cold end water inlet pipe of the condensation water heat exchanger, a condensation water supercharging variable frequency pump bypass pipeline is connected in parallel with the condensation water supercharging variable frequency pump, a condensation water supercharging variable frequency pump bypass regulating valve is arranged on the condensation water supercharging variable frequency pump bypass pipeline, and a condensation water heat exchanger condensation water inlet valve is arranged on an inlet pipeline of the condensation water supercharging variable frequency pump; the 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 heat efficiency of the boiler by modifying the existing WGGH system.
Description
Technical Field
The invention belongs to the technical field of energy conservation and environmental protection of boilers, and relates to a WGGH environment-friendly and energy-saving comprehensive utilization system, a boiler system and an operation method thereof.
Background
Along with the implementation of the energy-saving and emission-reducing upgrading and reforming action plan of coal and electricity, most coal motor sets are reformed by energy conservation and emission reduction, and a low-temperature closed heat medium water-tube heat exchanger (WGGH) system is also an important ring. The existing low-temperature closed heat medium water pipe type heat exchanger (WGGH) system comprises a flue gas cooler, an electric dust collector, a flue gas reheater, a circulating pump, an auxiliary steam heater and the like, wherein flue gas from an air preheater firstly enters the flue gas cooler, then passes through the dust collector and a desulfurizing device, and finally is discharged into the atmosphere through the flue gas reheater and a chimney. The outlet smoke temperature 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 outlet smoke temperature of the smoke heater is heated to above 70 ℃ so as to prevent the corrosion of a flue and a chimney and improve the lifting height of the smoke, strengthen the diffusion of the smoke and reduce the landing concentration of main pollutants; solving the problems of chimney rain around the chimney, white smoke and the like.
With the adoption 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 outlet smoke temperature of the smoke heater cannot be heated to be higher than 70 ℃, and downstream equipment is easy to corrode; when the boiler is in a high-load stage, the outlet smoke temperature of the smoke heater exceeds 100 ℃, so that heat loss is caused, and the energy-saving requirement cannot be met. The existing low-temperature closed heat medium water pipe type heat exchanger (WGGH) system cannot meet the total 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 the low-temperature closed heat medium water pipe type heat exchanger (WGGH) system to the high, medium and low load stages of the boiler, fully utilize the waste heat of the flue gas to improve the heat efficiency of the boiler and reduce the modification cost of the system is a technical problem to be solved by the technicians in the field.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide the WGGH environment-friendly and energy-saving comprehensive utilization system, the boiler system and the operation method thereof.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a WGGH environment-friendly and energy-saving comprehensive utilization system comprises a condensate 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 condensation water heat exchanger is connected with a hot medium water pipeline at the water side outlet of the flue gas reheater, a condensation water supercharging variable frequency pump is arranged on a cold end water inlet pipe of the condensation water heat exchanger, a condensation water supercharging variable frequency pump bypass pipeline is connected in parallel with the condensation water supercharging variable frequency pump, a condensation water supercharging variable frequency pump bypass regulating valve is arranged on the condensation water supercharging variable frequency pump bypass pipeline, and a condensation water heat exchanger condensation water inlet valve is arranged on an inlet pipeline of the condensation water supercharging variable frequency pump; the 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 condensate water supercharging variable frequency pumps are arranged and are connected in parallel.
Preferably, the WGGH environment-friendly and energy-saving comprehensive utilization system further comprises a flue gas reheater heat medium bypass pipeline, one end of the flue gas reheater heat medium bypass pipeline is communicated with a heat medium pipeline at a water side outlet of the flue gas reheater, the other end of the flue gas reheater heat medium bypass pipeline is communicated with a heat medium pipeline at a water side inlet of the flue gas reheater, and a flue gas reheater heat medium bypass regulating valve is arranged on the flue gas reheater heat medium bypass pipeline.
Preferably, the water side inlet of the flue gas cooler is connected with the water side outlet of the flue gas reheater through a first heat medium water pipeline, and the water side outlet of the flue gas cooler is connected with the water side inlet of the flue gas reheater through a second heat medium water pipeline;
the hot water end of the condensed water heat exchanger is connected with a first heat medium water pipeline;
and the first heat medium water pipeline is also provided with a pressure stabilizing water tank, a heat medium water circulation variable frequency pump and a flue gas cooler inlet heat medium water regulating valve, the condensation water heat exchanger, the pressure stabilizing water tank, the heat medium water circulation variable frequency pump and the flue gas cooler inlet heat medium water regulating valve are sequentially arranged on the first heat medium water pipeline along the water flow direction, and the pressure stabilizing water tank is connected with a variable frequency water supplementing pump.
Preferably; the second heat medium water pipeline is provided with a heat medium water vapor heater and a smoke reheater water side inlet regulating valve, the heat medium water vapor heater and the smoke 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 connected with the heat medium water vapor heater in parallel, and an inlet and an outlet of the heat medium water vapor 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, 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, a connection point of the flue gas reheater heat medium water bypass pipeline and the first heat medium water pipeline is positioned between a heat inlet of the condensation water heat exchanger and a water side outlet of the flue gas reheater, and a connection point of the flue gas reheater heat medium water bypass pipeline and the second heat medium water pipeline is positioned between an outlet of the heat medium water steam heater and a 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 cooler, the dust remover, the desulfurization absorption tower and the flue reheater are sequentially arranged along the flow direction of flue gas in the flue, and a cold end inlet and a hot end outlet of a condensed water heat exchanger are connected into a pipeline of a low-pressure heater of the boiler system.
Preferably, the cold end inlet of the condensed water heat exchanger is arranged at the inlet of the eighth low-pressure heater of the boiler system, and the hot cold end outlet of the condensed water heat exchanger is arranged at the inlet of the sixth low-pressure heater of the boiler system.
The invention relates to a method for operating a boiler system as described above, which is characterized by comprising the following steps:
before the WGGH environment-friendly and energy-saving comprehensive utilization system is started, adjusting the condensate water supercharging variable frequency pump to be in a stop state, opening a condensate water inlet valve of the condensate water heat exchanger and a condensate water outlet valve of the condensate water heat exchanger, and closing a bypass adjusting valve of the condensate water supercharging variable frequency pump;
when the WGGH environment-friendly and energy-saving comprehensive utilization system operates, condensed water in the low-pressure heater pipeline enters the cold water end of the condensed water heat exchanger through the cold end water inlet pipe of the condensed water heat exchanger and the condensed water supercharging variable frequency pump to absorb heat, and then flows back into the low-pressure heater pipeline from the 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 the boiler is increased;
when the load of the boiler is reduced, the output of a condensate water booster variable frequency pump is gradually reduced so as to reduce the condensate water flow entering a condensate water heat exchanger, so that the outlet smoke temperature of the smoke cooler is maintained at 90-95 ℃ and the outlet smoke temperature of the smoke reheater is maintained at 70-75 ℃;
when the boiler load is reduced, the output of the condensate water booster variable frequency pump cannot be reduced so that the outlet smoke temperature of the smoke cooler is maintained at 90-95 ℃ and the outlet smoke temperature of the smoke reheater is maintained at 70-75 ℃, the condensate water booster variable frequency pump is stopped, and the opening of a bypass regulating valve of the condensate water booster variable frequency pump is regulated so as to regulate the condensate water entering the condensate water heat exchanger, so that the outlet smoke temperature of the smoke cooler is maintained at 90-95 ℃ and the outlet smoke temperature of the smoke reheater is maintained at 70-75 ℃.
Preferably, when the flue gas reheater heating medium water bypass pipeline and the flue gas reheater heating medium water bypass regulating valve are arranged, and the boiler load is more than 80 percent: the bypass regulating valve of the condensate water supercharging variable frequency pump is in a closed state, the flue gas temperature of the outlet of the flue gas cooler is controlled to be 90-95 ℃, the flow rate of the heating medium entering the water side of the flue gas reheater is regulated through the opening of the heating medium bypass regulating valve of the flue gas reheater and the inlet regulating valve of the water side of the flue gas reheater, and the flue gas temperature of the outlet of the flue gas 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 the heat medium water system when the smoke temperature at the outlet of the smoke reheater is higher than 80 ℃ and heating the condensed water by connecting the heat water end of the condensed water heat exchanger with the heat medium water pipeline at the outlet of the smoke reheater. Through with condensate heat exchanger cold junction water and eighth low pressure heater entry connection, condensate heat exchanger cold junction water can insert boiler system's low pressure heater's pipeline, low pressure heater's temperature, reduce low pressure heater steam consumption, improve thermal efficiency. By arranging the condensate inlet valve of the condensate heat exchanger, the bypass pipeline of the condensate booster variable frequency pump, the condensate heat exchanger and the condensate outlet valve of the condensate heat exchanger, the condensate can be heated, the steam consumption of the low-pressure heater is reduced, and the heat efficiency is improved. The condensate water booster variable frequency pump can provide kinetic energy for condensate water entering the condensate water heat exchanger, so that the boiler load is in a high load stage, and when the exhaust temperature of the outlet of the flue gas reheater is ensured to be 70 ℃, the heat energy is recovered to the greatest extent, the condensate water temperature is heated, the steam consumption of the low-pressure heater is further reduced, and the heat efficiency is improved.
Furthermore, two condensate water supercharging variable frequency pumps are arranged and connected in parallel, so that the adjusting range of the flow of the cold end inlet of the condensate water heat exchanger can be enlarged, the requirement on a single condensate water supercharging variable frequency pump is reduced, and the cost is reduced.
Further, by arranging the flue gas reheater heating medium water bypass pipeline and the flue gas reheater heating medium water bypass regulating valve, when the boiler load is more than 80%, the water flow of the heating medium entering the flue gas reheater water side can be regulated by regulating the opening of the flue gas reheater heating medium water bypass regulating valve and the existing flue gas reheater water side inlet regulating valve, so that the flue gas temperature at the reheater outlet is controlled at a preset temperature.
Further, the cold end inlet of the condensation water heat exchanger is arranged at the inlet of the No. eight low-pressure heater of the boiler system, the hot cold end outlet of the condensation water heat exchanger is arranged at the inlet of the No. six low-pressure heater of the boiler system, 35-38 ℃ condensation water at the inlet of the No. eight low-pressure heater is heated to 95-100 ℃ through the condensation water heat exchanger, and the condensation water at the outlet of the condensation water heater of 95-100 ℃ and the condensation water at the outlet of the No. seven low-pressure heater of 85-90 ℃ can be mixed and then enter the No. six low-temperature heater, so that the temperature of the condensation water entering the boiler is increased, and the coal consumption of the boiler is reduced.
Drawings
FIG. 1 is a schematic view of the structure of the boiler system according to the present invention.
The boiler is characterized by comprising a boiler 1, an air preheater 2, a flue 3, a flue 4, a flue gas cooler 5, a dust remover 6, a desulfurization absorption tower 7, a flue gas reheater 8, a chimney 9, a flue gas reheater water side inlet regulating valve, a flue gas reheater heat medium bypass regulating valve 10, a flue gas reheater heat medium bypass pipeline 11, a heat medium water pipeline 12, a condensate water heat exchanger 13, a condensate water heat exchanger condensate water outlet valve 14, a fifth low-pressure heater 15, a sixth low-pressure heater 16, a seventh low-pressure heater 17, a eighth low-pressure heater 18, a condensate water pipeline 19, a condensate water heat exchanger condensate water inlet valve 20, a condensate water booster variable-frequency pump regulating valve 23, a condensate water booster variable-frequency pump bypass regulating valve 24, a condensate water booster variable-frequency pump 25, a heat medium water circulating variable-frequency pump 26, a water tank 27, a variable-frequency water pump 28, a water heater inlet heat medium valve 29, a heat medium water heater inlet and heat medium valve 30, a steam heater 32, a steam heater and a water heater pressure stabilizing and a heat medium water heater regulating variable-frequency pump 33.
Fig. 2 is a schematic diagram of a single-layer module structure in a flue gas cooler and a flue gas reheater according to an embodiment of the present invention.
Wherein 34 is a module drain valve, 35 is a module inlet shutoff valve, 36 is a module inlet header, 37 is a module exhaust 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 according to an embodiment of the present invention, 29 is a flue gas cooler inlet hot medium water regulating valve, 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, 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 attached drawings and examples:
referring to fig. 1, the boiler system with the WGGH energy-saving comprehensive utilization system comprises a flue gas cooler 4, a flue gas cooler inlet heating medium regulating valve 29, a flue gas reheater 7, a flue gas reheater water side inlet regulating valve 9, a heating medium water pipeline 12, a flue gas reheater heating medium bypass regulating valve 10, a flue gas reheater heating medium bypass pipeline 11, a heating medium water circulation variable frequency pump 26, a variable frequency water supplementing pump 28, a pressure stabilizing water tank 27, a condensed water pipeline 19, a condensed water heat exchanger condensed water inlet valve 20, a condensed water supercharging variable frequency pump bypass regulating valve 23, a condensed water supercharging variable frequency pump bypass pipeline 24, a condensed water supercharging variable frequency pump 25, a condensed water heat exchanger 13, a condensed water heat exchanger condensed water outlet valve 14 and a heating medium steam heater 31, wherein the flue gas cooler 4, the dust remover 5, the desulfurization absorption tower 6, the flue gas reheater 7 and a chimney 8 are sequentially arranged along the flow direction of flue gas in a flue 3, 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 circulating variable frequency pump 26 is arranged at the water side inlet heat medium water pipeline of the flue gas cooler 4; the heating medium water vapor heater 31 is arranged at the water side outlet heating medium water pipeline of the flue gas cooler 4; the reheater heating medium water bypass pipeline 11 is arranged at the hot water end inlet of the condensate heat exchanger 13 at the water side inlet of the flue gas reheater 7; the flue gas reheater heating medium water bypass regulating valve 10 is arranged at the flue gas reheater heating medium water bypass pipeline 11; the variable-frequency water supplementing pump 28 and the pressure stabilizing water tank 27 are sequentially arranged at the inlet hot medium water pipeline of the hot medium water circulating variable-frequency pump 26, and the variable-frequency water supplementing pump 28 is connected with the pressure stabilizing water tank 27; the cold end water inlet of the condensation water heat exchanger 13 is arranged at the inlet of the No. eight low-pressure heater 18 of the boiler system, and the cold end water outlet of the condensation water heat exchanger 13 is arranged at the inlet of the No. six low-pressure heater 16; the hot water end of the condensation water heat exchanger 13 is arranged at the hot medium water pipeline 12 of the outlet of the flue gas cooler; the condensed water supercharging variable frequency pump 25 is arranged at the water inlet of the cold end of the condensed water heat exchanger 13; the bypass pipeline 24 of the condensate water booster variable frequency pump and the bypass regulating valve 23 of the condensate water booster variable frequency pump are arranged at the inlet and the outlet of the condensate water booster variable frequency pump 25; the condensate water booster variable frequency pump bypass regulating valve 23 is arranged at the condensate water booster variable frequency pump bypass pipeline 24; the condensed water recycling pipeline 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; the condensate water recirculation regulating valve is disposed at the condensate water recirculation pipe. The flue gas cooler 4 water side inlet hot medium water pipeline is provided with a flue gas cooler inlet hot medium water regulating valve 29. The cold water end inlet of the condensed water heat exchanger 13 is provided with two condensed water supercharging variable frequency pumps 25.
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 a vertical flue gas cross-section height direction, and referring to fig. 2, each module is provided with a module 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 module drain valve 37; the flue gas cooler 4 comprises 5 modules in the height direction of the vertical 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 provided with 9 modules in the height direction of the vertical flue gas section, 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 according to the embodiment comprises the following steps:
before the WGGH energy-saving comprehensive utilization system is started, maintaining a stop state of the heat medium water circulation variable frequency pump 26, opening a flue gas cooler inlet heat medium water regulating valve 29, a flue gas reheater water side inlet regulating valve 9, a heat medium water heater bypass valve 33, all module inlet shutoff valves 35, module outlet shutoff valves 39 and module exhaust valves 37, closing the heat medium water heater water side inlet valve 30 and the heat medium water heater water side outlet valve 32, injecting desalted water into the heat medium water pipeline 12 through a variable frequency water supplementing pump 28, and closing all module exhaust valves 37 after water is filled; and (3) keeping the condensate water booster variable frequency pump 25 in a stop state, opening the condensate water inlet valve 20 and the condensate water outlet valve 14 of the condensate water heat exchanger, and closing the condensate water booster variable frequency pump bypass regulating valve 23.
When the WGGH energy-saving comprehensive utilization system is operated, flue gas generated by boiler combustion carries a large amount of heat and flows through the air preheater 2, the gas side of the flue gas cooler 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 the heat medium water circulation variable frequency pump 26, firstly enters the water side of the flue gas cooler 4 to absorb heat, then a part of the desalted water enters the flue gas reheater 7 to heat clean flue gas, then enters the hot water end of the condensation water heat exchanger 13, a part of the desalted water directly enters the hot water end of the condensation 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 condensate in the condensate pipeline 19 is supplied with power by the condensate booster variable frequency pump 25 to enter the cold water end of the condensate heat exchanger 13 to absorb heat, when the smoke exhaust temperature at the outlet of the smoke reheater is higher than 70 ℃, the condensate heat exchanger 13 absorbs the redundant heat of the heat medium water system to heat the condensate, and a part of the heated condensate enters the No. six low-pressure heater 16 to improve the condensate temperature entering the boiler.
When the boiler load is above 80%, the working frequency of the heating medium water circulating variable frequency pump 26 is adjusted to adjust the flow of heating medium water entering the water side of the flue gas cooler 4, and the working frequency of the condensate water pressurizing variable frequency pump 25 is adjusted to control the flow of condensate water on the water side of the condensate water heat exchanger, so that the flue gas temperature at the outlet of the flue gas cooler is controlled at 90 ℃. The water flow rate of the heating medium entering the water side of the flue gas reheater 7 is regulated by regulating the opening of a flue gas reheater heating medium bypass regulating valve 10 and a flue gas reheater water side inlet regulating valve 9 on a flue gas reheater heating medium bypass pipeline 11, so that the flue gas temperature at the outlet of the reheater is controlled at 70 ℃; the condensate enters the cold water end of the condensation heat exchanger 13 to be heated to 98 ℃ and then enters the No. six low-pressure heater 16, and the bypass regulating valve 23 of the condensate booster variable-frequency pump is in a closed state.
In order to ensure that the outlet smoke temperature of the smoke cooler is 90 ℃ and the outlet smoke temperature of the reheater is 70 ℃ along with the reduction of the load of the boiler, the working frequency and the running number of the condensate water booster variable frequency pump 25 can be reduced gradually to adjust the condensate water flow entering the condensate water heat exchanger; as the boiler load drops again, the condensate booster variable frequency pump 25 is shut down, and the opening of the condensate booster variable frequency pump bypass regulating valve 23 is regulated to regulate the condensate entering the condensate heat exchanger, so that the condensate can enter the condensate heat exchanger 13 by providing kinetic energy to the condensate system.
Taking the transformation of a certain coastal 1000MW coal-fired power plant by using the WGGH energy-saving comprehensive utilization system of the invention as an example, the operation of the original WGGH system is greatly influenced by the load variation of the boiler, and when the boiler is in a low-load stage, the outlet smoke temperature of the 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 outlet smoke temperature of the smoke heater exceeds 100 ℃, so that heat loss is caused, and the energy-saving requirement cannot be met. The condensation water heat exchanger is arranged on the original WGGH system, and the WGGH heat medium water system is connected with the condensation water system through the condensation water heat exchanger, so that the transformation cost is reduced; the temperature of hot medium water at the cold end inlet of the flue gas cooler is regulated by arranging the condensed water supercharging variable frequency pump 25 and the condensed water supercharging variable frequency pump bypass regulating valve 23, so that the flue gas temperature at the outlet of the flue gas cooler is maintained at 90-95 ℃ when the boiler is in low, medium and high load stages, and the best working efficiency of the dust remover is ensured; the flue gas temperature of the outlet of the flue gas heater is regulated by the flue gas reheater heat medium water bypass regulating valve, so that when the boiler is in a low, medium and high load stage, the flue gas temperature of the outlet of the flue gas cooler is maintained at 70-75 ℃, and under the condition that downstream equipment is not corroded, the flue gas waste heat is recovered, and the heat efficiency of the boiler is improved.
By utilizing the 1000MW coal-fired power plant transformed by the WGGH energy-saving comprehensive utilization system, 645-655 t/h of condensed water can be heated from 35-38 ℃ to 95-100 ℃ while meeting the requirements of various indexes, and the temperature of the condensed water entering a boiler is improved. The WGGH energy-saving comprehensive utilization system has the characteristics of low cost, short investment recovery period, improvement of the heat efficiency of the boiler by waste heat recovery, 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 heat medium water system for heating the condensed water when the smoke temperature of the smoke reheating gas outlet is higher than 80 ℃ by connecting the hot water end of the condensed water heat exchanger with the heat medium water pipeline of the smoke reheater outlet. Through with condensate water heat exchanger cold junction water and No. eight low pressure heater entry connection, condensate water heat exchanger cold junction water and No. six low pressure heater entry connection can be used for heating the condensate water with the energy when condensate water heat exchanger exchanges heat, and the condensate water that is heated gets into No. six low pressure heater, improves No. six low pressure heater's warm water, reduces No. six low pressure heater steam consumption, improves the thermal efficiency.
By arranging the condensate inlet valve 20 of the condensate heat exchanger, the condensate booster variable frequency pump bypass pipeline 24, the condensate booster variable frequency pump 25, the condensate heat exchanger 13 and the condensate outlet valve 14 of the condensate heat exchanger, condensate can be introduced into the condensate heat exchanger from the eighth low-pressure heater and then enter the sixth low-pressure heater. The condensate water booster variable frequency pump provides kinetic energy for condensate water entering the condensate water heat exchanger, and when the boiler load is in a high load stage and the exhaust temperature of the outlet of the flue gas reheater is ensured to be 70 ℃, the heat energy is recovered to the greatest extent, the condensate water temperature is heated, the steam consumption of the No. six low-pressure heater is reduced, and the heat efficiency is improved.
Through setting up condensate water booster variable frequency pump bypass governing valve 23 and condensate water booster variable frequency pump bypass pipeline 24, can introduce condensate water from No. eight low pressure heater to reentrant No. six low pressure heater behind the condensate water heat exchanger 13 heat, condensate water booster variable frequency pump bypass governing valve rely on condensate water system to provide kinetic energy regulation entering condensate water heat exchanger condensate water flow, satisfy when boiler load is in middle, low load stage when guaranteeing flue gas reheater export exhaust gas temperature 70 ℃, the heat recovery is the maximum degree, heats condensate water temperature, reduces No. six low pressure heater steam consumption, improves thermal efficiency.
The flue gas cooler 4, the flue gas reheater 7, the heat medium water pipeline 12 and the heat medium water circulating variable frequency pump 26 are arranged, the heat medium water variable frequency pump provides kinetic energy for heat medium water, the heat medium water can be flowed into the flue gas cooler to absorb heat energy, so that the flue gas temperature at the inlet of the dust remover is reduced to 90 ℃, and the dust removing 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 temperature at the outlet of the flue gas reheater to 70 ℃ so as to prevent the corrosion of a flue and a chimney, improve the lifting height of the flue gas, strengthen the diffusion of the flue gas and reduce the landing concentration of main pollutants; solving the problems of chimney rain around the chimney, white smoke and the like.
Claims (8)
1. The WGGH environment-friendly and energy-saving comprehensive utilization system is characterized by comprising a condensate heat exchanger (13), and a flue gas cooler (4) and a flue gas reheater (7) which are arranged on a flue (3) of a boiler (1); the hot water end of the condensation water heat exchanger (13) is connected with a hot medium water pipeline at the water side outlet of the flue gas reheater (7), a condensation water supercharging variable frequency pump (25) is arranged on a cold end water inlet pipe of the condensation water heat exchanger (13), a condensation water supercharging variable frequency pump bypass pipeline (24) is connected in parallel with the condensation water supercharging variable frequency pump (25), a condensation water supercharging variable frequency pump bypass regulating valve (23) is arranged on the condensation water supercharging variable frequency pump bypass pipeline (24), and a condensation water heat exchanger condensation water inlet valve (20) is arranged on an inlet pipeline of the condensation water supercharging variable frequency pump (25); a cold end water outlet pipe of the condensed water heat exchanger (13) is provided with a condensed water outlet valve (14) of the condensed water heat exchanger;
the WGGH environment-friendly and energy-saving comprehensive utilization system further comprises a flue gas reheater heat medium water bypass pipeline (11), one end of the flue gas reheater heat medium water bypass pipeline (11) is communicated with a heat medium water pipeline at a water side outlet of the flue gas reheater (7), the other end of the flue gas reheater heat medium water bypass pipeline (11) is communicated with a heat medium water pipeline at a water side inlet of the flue gas reheater (7), and a flue gas reheater heat medium water bypass regulating valve (10) is arranged on the flue gas reheater heat medium water bypass pipeline (11);
the water side inlet of the flue gas cooler (4) is connected with the water side outlet of the flue gas reheater (7) through a first heat medium water pipeline, and the water side outlet of the flue gas cooler (4) is connected with the water side inlet of the flue gas reheater (7) through a second heat medium water pipeline;
the hot water end of the condensation water heat exchanger (13) is connected with a first heat medium water pipeline;
still be equipped with steady voltage water tank (27), heat medium water circulation variable frequency pump (26) and flue gas cooler import heat medium water regulating valve (29) on the first heat medium water pipeline, condensate water heat exchanger (13), steady voltage water tank (27), heat medium water circulation variable frequency pump (26) and flue gas cooler import heat medium water regulating valve (29) set gradually along the rivers direction on first heat medium water pipeline, be connected with variable frequency moisturizing pump (28) on steady voltage water tank (27).
2. The WGGH environmental protection and energy conservation comprehensive utilization system according to claim 1, wherein two condensate water booster variable frequency pumps (25) are arranged, and the two condensate water booster variable frequency pumps (25) are connected in parallel.
3. The WGGH environmental protection and energy conservation comprehensive utilization system of claim 1, wherein;
the second heating medium water pipeline is provided with a heating medium water vapor heater (31) and a flue gas reheater water side inlet regulating valve (9), the heating medium water vapor heater (31) and the flue gas reheater water side inlet regulating valve (9) are sequentially arranged on the second heating medium water pipeline along the water flow direction, the second heating medium water pipeline is connected with a heating medium water heater bypass valve (33) connected with the heating medium water vapor heater (31) in parallel, and an inlet and an outlet of the heating medium water vapor heater (31) are respectively provided with a heating medium water heater water side inlet valve (30) and a heating medium water heater water side outlet valve (32).
4. The WGGH environmental protection and energy saving comprehensive utilization system according to claim 1, wherein two ends of a flue gas reheater heat medium water bypass pipeline (11) are respectively connected with a first heat medium water pipeline and a second heat medium water pipeline, a connection point of the flue gas reheater heat medium water bypass pipeline (11) and the first heat medium water pipeline is positioned between a heat inlet of a condensation water heat exchanger (13) and a water side outlet of a flue gas reheater (7), and a connection point of the flue gas reheater heat medium water bypass pipeline (11) and the second heat medium water pipeline is positioned between an outlet of a heat medium water steam heater (31) and a flue gas reheater water side inlet regulating valve (9).
5. The utility model provides a boiler system, a serial communication port, including air heater (2), flue (3), dust remover (5), desulfurization absorption tower (6) and the WGGH environmental protection and energy-conserving comprehensive utilization system of any one of claims 1-4, along the flow direction of flue gas in flue (3), air heater (2), flue gas cooler (4), dust remover (5), desulfurization absorption tower (6) and flue gas reheater (7) set gradually, cold junction entry and the hot-cold junction export of condensate water heat exchanger (13) access with the pipeline of boiler system's low pressure heater.
6. A boiler system according to claim 5, wherein the cold end inlet of the condensate heat exchanger (13) is arranged at the inlet of a No. eight low pressure heater (18) of the boiler system, and the hot cold end outlet of the condensate heat exchanger (13) is arranged at the inlet of a No. six low pressure heater (16) of the boiler system.
7. A method of operating a boiler system according to claim 5 or 6, comprising the steps of:
before the WGGH environment-friendly and energy-saving comprehensive utilization system is started, adjusting a condensate water supercharging variable frequency pump (25) to be in a stop state, opening a condensate water inlet valve (20) of a condensate water heat exchanger and a condensate water outlet valve (14) of the condensate water heat exchanger, and closing a condensate water supercharging variable frequency pump bypass adjusting valve (23);
when the WGGH environment-friendly and energy-saving comprehensive utilization system is operated, condensed water in the low-pressure heater pipeline enters the cold water end of the condensed water heat exchanger (13) to absorb heat through the cold end water inlet pipe of the condensed water heat exchanger and the condensed water supercharging variable frequency pump (25), and then flows back to the low-pressure heater pipeline from the 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 condensed water temperature entering the boiler is increased;
when the load of the boiler is reduced, the output of a condensate water supercharging variable frequency pump (25) is gradually reduced so as to reduce the condensate water flow entering a condensate water heat exchanger (13), so that the outlet smoke temperature of a smoke cooler (4) is maintained at 90-95 ℃ and the outlet smoke temperature of a smoke reheater (7) is maintained at 70-75 ℃;
when the boiler load is reduced, the output of the condensate water supercharging variable frequency pump (25) cannot be reduced, so that the outlet smoke temperature of the smoke cooler (4) is maintained at 90-95 ℃ and the outlet smoke temperature of the smoke reheater (7) is maintained at 70-75 ℃, the condensate water supercharging variable frequency pump (25) is stopped, and the opening of the condensate water supercharging variable frequency pump bypass regulating valve (23) is regulated to regulate the condensate water entering the condensate water heat exchanger (13) so that the outlet smoke temperature of the smoke cooler (4) is maintained at 90-95 ℃ and the outlet smoke temperature of the smoke reheater (7) is maintained at 70-75 ℃.
8. The operation method of the boiler system according to claim 7, wherein when the flue gas reheater heat medium water bypass pipe (11) and the flue gas reheater heat medium water bypass adjustment valve (10) are provided, and the boiler load is 80% or more: the bypass regulating valve (23) of the condensate water supercharging variable frequency pump is in a closed state, the outlet smoke temperature of the smoke cooler (4) is controlled to be 90-95 ℃, and the water flow of the water side heating medium entering the smoke reheater (7) is regulated through the opening of the bypass regulating valve (10) of the heating medium of the smoke reheater and the water side inlet regulating valve (9) of the smoke reheater, so that the outlet smoke temperature of the smoke reheater (7) is controlled to be 70-75 ℃.
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