CN111895385A - Circulating fluidized bed combined heat and power generation unit flue gas slag waste heat cascade utilization system - Google Patents
Circulating fluidized bed combined heat and power generation unit flue gas slag waste heat cascade utilization system Download PDFInfo
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- CN111895385A CN111895385A CN202010780507.9A CN202010780507A CN111895385A CN 111895385 A CN111895385 A CN 111895385A CN 202010780507 A CN202010780507 A CN 202010780507A CN 111895385 A CN111895385 A CN 111895385A
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- 239000002893 slag Substances 0.000 title claims abstract description 115
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 239000003546 flue gas Substances 0.000 title claims abstract description 43
- 239000002918 waste heat Substances 0.000 title claims abstract description 43
- 238000010248 power generation Methods 0.000 title claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 172
- 238000010438 heat treatment Methods 0.000 claims description 23
- 239000000428 dust Substances 0.000 claims description 7
- 239000003245 coal Substances 0.000 claims description 2
- 238000002955 isolation Methods 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 abstract description 9
- 238000005260 corrosion Methods 0.000 abstract description 9
- 239000000779 smoke Substances 0.000 description 11
- 238000000605 extraction Methods 0.000 description 9
- 238000009833 condensation Methods 0.000 description 5
- 230000005494 condensation Effects 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000012717 electrostatic precipitator Substances 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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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
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/003—Feed-water heater 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
- F22D7/00—Auxiliary devices for promoting water circulation
- F22D7/06—Rotary devices, e.g. propellers
- F22D7/08—Arrangements of pumps, e.g. outside the boilers
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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
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/02—Hot-water central heating systems with forced circulation, e.g. by pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
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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)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention belongs to the technical field of circulating fluidized bed cogeneration units, and particularly relates to a circulating fluidized bed cogeneration unit, which comprises a slag cooler booster pump, a slag cooler, a low-temperature economizer booster pump, a low-temperature economizer, a heat supply network circulating water pump and a heat supply network heater, wherein a water inlet of the slag cooler is connected with a water outlet of the slag cooler booster pump, the slag cooler booster pump is connected with a heat supply network water return pipeline, a water outlet of the slag cooler is connected with the low-temperature economizer booster pump, the low-temperature economizer booster pump is connected with a water inlet of the low-temperature economizer, a water outlet of the low-temperature economizer is connected with a water supply pipeline of the heat supply network, a water inlet of the heat supply network heater is connected with the heat supply network water. The system solves the problems of difficult condensed water flow distribution of the fluidized bed cogeneration unit, flue gas corrosion of a low-temperature economizer and low utilization rate of waste heat of a steam turbine, and can be widely applied to pipeline circuits for waste heat utilization of various related cogeneration units.
Description
Technical Field
The invention belongs to the technical field of circulating fluidized bed cogeneration units, and particularly relates to a cascade utilization system for flue gas and slag waste heat of a circulating fluidized bed cogeneration unit.
Background
Energy conservation and emission reduction in the urban clean heating industry are always key works of national and local planning. The combined heat and power generation technology realizes the cascade utilization of energy and has great significance for realizing the energy conservation and emission reduction of the urban clean heating. However, for the current large-capacity co-production heat supply unit, steam extraction and heat supply are mainly used, the steam extraction grade is higher, a part of steam is still discharged from the low-pressure cylinder of the steam turbine, and the large cold source loss exists. The boiler side flue gas and slag waste heat of the cogeneration unit are large in quantity, and the flue gas and slag waste heat are recovered for urban clean heating, so that the energy gradient utilization of the cogeneration unit can be greatly exerted, and the boiler side flue gas and slag waste heat recovery method has great significance for national energy conservation and emission reduction work.
The circulating fluidized bed boiler flue gas waste heat is generally recycled by arranging a low-temperature economizer in front of a dust remover or at the outlet of a draught fan, a cold source of the low-temperature economizer is also condensation water, but because a circulating fluidized bed unit must ensure the running reliability of a slag cooler at first, the consumption of the cold source of the slag cooler needs to be ensured by the condensation water at first, and further the problem that the flow distribution difficulty of the condensation water of a unit thermodynamic system is high when the low-temperature economizer of the circulating fluidized bed unit runs is caused, in the actual running process of the unit, a water feeding regulating valve of the unit deaerator is in a large-amplitude throttling state, and the power consumption rate of a condensation water pump of the circulating fluidized bed unit is higher than that of a capacity. The problem of flue gas acid dew point corrosion exists during the operation of the low-temperature economizer, the wall temperature of the cold end of the low-temperature economizer must be strictly controlled, the wall temperature of the cold end is generally implemented by controlling the temperature of a cold source at the inlet of the low-temperature economizer, and the operation reliability of the low-temperature economizer and the corrosion of a flue behind the low-temperature economizer are considered. The smoke temperature of the circulating fluidized bed boiler is about 130-; when the condensed water is adopted to recover the waste heat of the flue gas and the furnace slag, the steam can be exhausted from the low-pressure cylinder of the steam turbine, and the waste heat utilization rate is relatively low.
Therefore, there is a need to improve upon the above problems.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a cascade utilization system for flue gas and slag waste heat of a combined heat and power generation unit of a circulating fluidized bed, which can solve the problems of difficult distribution of condensed water flow, flue gas corrosion of a low-temperature economizer and low utilization rate of waste heat of a steam turbine of the combined heat and power generation unit of the circulating fluidized bed.
The technical scheme adopted by the invention is as follows:
a cascade utilization system for flue gas and slag waste heat of a circulating fluidized bed cogeneration unit comprises a slag cooler booster pump, a slag cooler, a low-temperature economizer booster pump, a low-temperature economizer, a heat supply network circulating water pump and a heat supply network heater, the water inlet of the slag cooler is connected with the water outlet of the slag cooler booster pump, the water inlet of the slag cooler booster pump is connected with the hot net water return pipeline, the water outlet of the slag cooler is connected with the water inlet of the booster pump of the low-temperature economizer through the water outlet pipeline of the slag cooler, the water outlet of the low-temperature economizer booster pump is connected with the water inlet of the low-temperature economizer, the water outlet of the low-temperature economizer is connected with the water supply pipeline of the heat supply network through the water outlet pipeline of the low-temperature economizer, the water inlet of the heat supply network heater is connected with a heat supply network water return pipeline, the heat supply network water return pipeline positioned at the inlet of the heat supply network heater is connected with a heat supply network circulating water pump, and the water outlet of the heat supply network heater is connected with a heat supply network water supply pipeline.
The slag cooler water outlet pipeline and the heat supply network water supply pipeline are connected through a first branch, one port of the first branch is positioned at the slag cooler water outlet, the other port of the first branch is positioned at the slag cooler booster pump water inlet, a slag cooler outlet adjusting door is arranged on the first branch, and an electric isolating valve is arranged at one end, close to the heat supply network water return pipeline, of the slag cooler outlet adjusting door on the first branch; and a slag cooler water outlet pipeline at one end of a water inlet of the low-temperature economizer booster pump is connected with a low-temperature economizer water outlet pipeline through a second branch, a low-temperature economizer recirculation door is arranged on the second branch, and an electric isolating valve is arranged at one end, close to the low-temperature economizer booster pump, of the low-temperature economizer recirculation door on the second branch.
And an electric isolating valve is arranged on the slag cooler water outlet pipeline between the first branch and the second branch.
The inlet of the slag cooler booster pump is provided with an electric isolating valve, the two ends of the heat supply network circulating water pump are respectively provided with the electric isolating valve, and the low-temperature economizer water outlet pipeline close to the heat supply network water supply pipeline is provided with the electric isolating valve.
And the flue gas inlet of the low-temperature economizer is connected with the flue gas pipeline at the outlet of the air preheater.
The low-temperature economizer flue gas outlet is connected with the inlet flue end of the electric dust collector, and the outlet flue of the electric dust collector is connected with the induced draft fan.
The slag cooler is a roller slag cooler.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention leads the return water of the heat supply network into the slag cooler, and the supply and return temperatures of the heat supply circulating water of the cogeneration unit are respectively 110 ℃ and 50 ℃ in the central heating stage; the return water temperature is 50 ℃, the whole heat supply period is relatively stable, the water quality of the heat supply circulating water is generally softened water, the water can be preferably used as a cold source of a slag cooler of a circulating fluidized bed unit, the waste heat of slag is recovered by entering a roller slag cooler, the circulating water of a heating network is heated to 70-75 ℃, the outlet water temperature can be adjusted by the running frequency of a cooling water pump of the slag cooler, the heat of the slag cooler is recovered, the water temperature of an outlet of the slag cooler is maintained at 72-75 ℃, the water is just used as cooling water of a low-temperature economizer, the waste heat of smoke exhaust of boiler smoke can be recovered, and the problem of cold end corrosion of the low.
2. The invention connects the low-temperature economizer behind the air preheater, and the temperature of the water of the heat supply network at the outlet of the low-temperature economizer can reach 100-; by recovering the waste heat of the boiler exhaust smoke and the slag, the high-quality steam extraction amount of the heat supply network heater can be reduced, the steam extraction amount of a steam turbine intermediate pressure cylinder is reduced, compared with the original condensed water cooling mode, the steam extraction level of the displacement is higher, and the economy is greatly improved; in addition, as the condensate water is not required to be cooled, the condensate water upper water regulating valve of the circulating fluidized bed unit can reduce the throttling operation time, and the power consumption rate of the condensate pump is greatly reduced.
3. The invention arranges the water outlet of the slag cooler and the water outlet of the low-temperature economizer in series, and finally mixes the water outlet of the slag cooler and the water outlet of the heat supply network heater to supply heat to the outside, thereby greatly reducing the heat supply coal consumption of the unit, improving the efficiency of energy cascade utilization, saving the heat supply steam extraction quantity of the unit and improving the load regulation capacity of the unit while recovering the waste heat of the flue gas and the slag.
4. The invention fully considers the flue gas and slag waste heat energy levels of the circulating fluidized bed unit, and the circulating fluidized bed cogeneration unit can maintain the waste heat gradient utilization mode of the slag cooler and the low-temperature economizer in the whole heat supply period within 5-6 months of the whole winter heat supply operation, thereby meeting the design load requirement of the unit, and reducing the flue gas amount and the slag discharge amount of the unit when the unit operates at low load.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Wherein: the system comprises a slag cooler 1, a slag cooler booster pump 2, a low-temperature economizer 3, a low-temperature economizer booster pump 4, a slag cooler outlet regulating gate 5, a low-temperature economizer recirculation gate 6, a heating network heater 7, a heating network circulating water pump 8, an electric dust remover 9, an induced draft fan 10, a heating network water return pipeline 11, a heating network water supply pipeline 12, a slag cooler water outlet pipeline 13, a low-temperature economizer water outlet pipeline 14, a first branch 15, a second branch 16 and an air preheater outlet flue gas pipeline 17.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in figure 1, the flue gas and slag waste heat gradient utilization system of the circulating fluidized bed cogeneration unit comprises a slag cooler 1, a slag cooler booster pump 2, a low-temperature economizer 3, a low-temperature economizer booster pump 4, a heat supply network heater 7, a heat supply network circulating water pump 8, a heat supply network water return pipeline 11 and a heat supply network water supply pipeline 12, wherein a water inlet of the slag cooler 1 is connected with a water outlet of the slag cooler booster pump 2, a water inlet of the slag cooler booster pump 2 is connected with the heat supply network water return pipeline 11, a water outlet of the slag cooler 1 is connected with a water inlet of the low-temperature economizer booster pump 4 through a slag cooler water outlet pipeline 13, a water outlet of the low-temperature economizer booster pump 4 is connected with a water inlet of the low-temperature economizer 3, a water outlet of the low-temperature economizer 3 is connected with the heat supply network water supply pipeline 12 through a low-temperature economizer water outlet pipeline 14, a water inlet of the, the utility model discloses a circulating water supply system, including the circulating water supply system, be located the heat supply network heater 7 entrance, be connected with heat supply network circulating water pump 8 on the heat supply network return water pipeline 11, the heat supply network heater 7 delivery port is connected with heat supply network water supply pipeline 12, utilizes the characteristics that the cogeneration unit heat supply circulating water supplies in city centralized heating stage, return temperature respectively 110, 50 ℃, return water temperature 50 ℃ and whole heat supply period relatively more stable, heat supply circulating water quality of water generally is demineralized water, can be the cold source of circulating fluidized bed unit slag cooler 1 well best, through getting into cylinder slag cooler 1 and retrieving the slag waste heat, heat supply network circulating water to 72-75 ℃, leaving water temperature can be adjusted through slag cooler 1 cooling water pump running frequency.
The slag cooler water outlet pipeline 13 and the heat supply network water supply pipeline 12 are connected through a first branch 15, one port of the first branch 15 is located at a water outlet of the slag cooler 1, the other port of the first branch 15 is located at a water inlet of the slag cooler booster pump 2, the first branch 15 is provided with a slag cooler outlet adjusting door 5, and one end, close to the heat supply network water return pipeline 11, of the slag cooler outlet adjusting door 5 on the first branch 15 is provided with an electric isolating valve; a slag cooler water outlet pipeline 13 at one end of a water inlet of the low-temperature economizer booster pump 4 is connected with a low-temperature economizer water outlet pipeline 14 through a second branch 16, a low-temperature economizer recirculation door 6 is arranged on the second branch 16, and an electric isolation valve is arranged at one end, close to the low-temperature economizer booster pump 4, of the low-temperature economizer recirculation door 6 on the second branch 16.
An electric isolating valve is arranged on the slag cooler water outlet pipeline 13 between the first branch 15 and the second branch 16.
An electric isolating valve is arranged at the inlet of the slag cooler booster pump 2, electric isolating valves are respectively arranged at the two ends of the heat supply network circulating water pump 8, and an electric isolating valve is arranged on the low-temperature economizer water outlet pipeline 14 close to the heat supply network water supply pipeline 12.
And a smoke inlet of the low-temperature economizer 3 is connected with a smoke pipeline 17 at an outlet of the air preheater.
3 exhanst gas outlets of low temperature economizer are connected with 9 entry flue ends of electrostatic precipitator, 9 export flues of electrostatic precipitator are connected with draught fan 10, and circulating fluidized bed boiler flue gas waste heat is generally through setting up low temperature economizer 3 and come the recovery flue gas waste heat before electrostatic precipitator 9 or draught fan 10 export.
The slag cooler 1 is a roller slag cooler.
After the unit enters the heating period, a primary network of a heat supply network system is filled with heat supply network circulating water, a heat supply network circulating water pump 8 is started to operate, the temperature of return water of a heat supply network is generally 48-53 ℃, return water of the heat supply network is boosted by a slag cooler booster pump 2 to enter a roller slag cooler 1, slag waste heat is cooled and recovered, the slag cooler booster pump 2 is operated in a variable frequency mode, the outlet water temperature of the roller slag cooler 1 is adjusted and controlled by adjusting the frequency of the slag cooler booster pump 2 and is generally controlled at 70-75 ℃. The outlet water of the slag cooler 1 enters the low-temperature economizer 3 through a low-temperature economizer booster pump 4 to recover the waste heat of the flue gas, the unit is generally put into operation with a warm air blower in the heating period, the temperature of the flue gas discharged by the unit is generally 135-150 ℃, the temperature of the inlet water of the low-temperature economizer 3 needs to be controlled to be not lower than 72 ℃ after the waste heat of the flue gas enters the heat supply network water of the low-temperature economizer 3 to recover the waste heat of the flue gas after the waste heat of the flue gas is raised to 110 ℃ so as to control the cold end of the low-temperature economizer 3 not to generate low-temperature corrosion, the inlet water temperature of the low-temperature economizer 3 is controlled, the inlet water temperature of the low-temperature economizer 3 is related to the outlet water temperature of the slag cooler 1, and the outlet recirculation door 6 of the low-temperature economizer. After the waste heat of the flue gas is recovered by the heat supply network water, the temperature of the flue gas at the outlet of the low-temperature economizer 3 can be controlled at 95 ℃, and the smoke discharge loss of the unit is greatly reduced. The heat supply network water heated by the low-temperature economizer 3 can be guided to an outlet pipeline of the heat supply network heater 7 by means of the pressure rise of the booster pump, and is mixed with the heat supply network circulating water heated by the heat supply network heater 7 and boosted by the heat supply network circulating water pump 8 to supply heat to the outside. When the system is designed, the design load requirement of a unit is required, when the unit runs at a low load, the smoke gas volume and the slag discharge volume of the unit are reduced, the water volume of a heating network required by the roller slag cooler 1 and the low-temperature economizer 3 is reduced, the water volume of the heating network entering the low-temperature economizer 3 can be controlled by controlling the slag cooler outlet regulating valve 5, and further the flow balance of the whole system is maintained.
The invention fully considers the waste heat energy levels of the flue gas and the slag of the circulating fluidized bed unit, and the circulating fluidized bed unit is a main heat source unit for bearing urban centralized heating in northern areas. The circulating fluidized bed boiler flue gas waste heat is generally recovered by arranging a low-temperature economizer 3 in front of an electric dust remover 9 or at the outlet of an induced draft fan 10, a cold source of the low-temperature economizer 3 is also generally condensed water, but because a circulating fluidized bed unit must ensure the running reliability of a slag cooler 1 at first, the consumption of the cold source of the slag cooler 1 needs to be ensured by the condensed water at first, the problem of flue gas acid dew point corrosion exists when the low-temperature economizer 3 runs, the cold end wall temperature of the low-temperature economizer 3 must be strictly controlled, the cold end wall temperature is generally implemented by controlling the temperature of an inlet cold source of the low-temperature economizer 3, the running reliability of the low-temperature economizer 3 and the corrosion of a flue behind the low-temperature economizer 3 are considered, the temperature of the inlet cold source of the low-temperature economizer 3 needs to be controlled at 72-75 ℃, the invention utilizes the heat of the recovered slag cooler 1, the cooling water can be used as the cooling water of the low-temperature economizer 3, the waste heat of the smoke discharged from the boiler can be recovered, and the problem of corrosion of the cold end of the low-temperature economizer 3 can be well solved. By recovering the waste heat of the smoke exhausted by the boiler, the temperature of the heat supply network water at the outlet of the low-temperature economizer 3 can reach 100-. By recovering the waste heat of the boiler exhaust smoke and the slag, the high-quality steam extraction amount of the heat supply network heater can be reduced, the steam extraction amount of a steam turbine intermediate pressure cylinder is reduced, compared with the original condensed water cooling mode, the steam extraction level of the displacement is higher, and the economy is greatly improved; in addition, as the condensate water is not required to be cooled, the condensate water upper water regulating valve of the circulating fluidized bed unit can reduce the throttling operation time, and the power consumption rate of the condensate pump is greatly reduced.
The heat supply operation time of the circulating fluidized bed cogeneration unit in northern areas is generally 5-6 months in winter, the gradient utilization mode of the waste heat of the slag cooler 1 and the low-temperature economizer 3 can be maintained in the whole heat supply period, and the standby unit enters a pure condensation working condition and then is switched to a condensed water cooling mode.
Although only the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and all changes are encompassed in the scope of the present invention.
Claims (7)
1. The utility model provides a circulating fluidized bed combined heat and power generation unit flue gas slag waste heat cascade utilization system which characterized in that: comprises a slag cooler (1), a slag cooler booster pump (2), a low-temperature economizer (3), a low-temperature economizer booster pump (4), a heating network heater (7), a heating network circulating water pump (8), a heating network water return pipeline (11) and a heating network water supply pipeline (12), wherein a water inlet of the slag cooler (1) is connected with a water outlet of the slag cooler booster pump (2), a water inlet of the slag cooler booster pump (2) is connected with the heating network water return pipeline (11), a water outlet of the slag cooler (1) is connected with a water inlet of the low-temperature economizer booster pump (4) through a slag cooler water outlet pipeline (13), a water outlet of the low-temperature economizer booster pump (4) is connected with a water inlet of the low-temperature economizer (3), a water outlet of the low-temperature economizer (3) is connected with the heating network water supply pipeline (12) through a low-temperature economizer water outlet pipeline (14), a water inlet of the heating network heater (7) is connected with the heating network water return pipeline (11), and a heat supply network circulating water pump (8) is connected to the heat supply network water return pipeline (11) at the inlet of the heat supply network heater (7), and the water outlet of the heat supply network heater (7) is connected with a heat supply network water supply pipeline (12).
2. The cascade utilization system of the flue gas and slag waste heat of the circulating fluidized bed combined heat and power generation unit as claimed in claim 1, wherein: the slag cooler water outlet pipeline (13) and the heat supply network water supply pipeline (12) are connected through a first branch (15), one port of the first branch (15) is located at a water outlet of the slag cooler (1), the other port of the first branch (15) is located at a water inlet of the slag cooler booster pump (2), a slag cooler outlet adjusting door (5) is arranged on the first branch (15), and an electric isolating valve is arranged at one end, close to the heat supply network water return pipeline (11), of the slag cooler outlet adjusting door (5) on the first branch (15); the slag cooler water outlet pipeline (13) at one end of a water inlet of the low-temperature economizer booster pump (4) is connected with the low-temperature economizer water outlet pipeline (14) through a second branch (16), a low-temperature economizer recirculation door (6) is arranged on the second branch (16), and an electric isolation valve is arranged at one end, close to the low-temperature economizer booster pump (4), of the low-temperature economizer recirculation door (6) on the second branch (16).
3. The cascade utilization system of the flue gas and slag waste heat of the circulating fluidized bed combined heat and power generation unit as claimed in claim 2, wherein: an electric isolating valve is arranged on the slag cooler water outlet pipeline (13) between the first branch (15) and the second branch (16).
4. The cascade utilization system of the flue gas and slag waste heat of the circulating fluidized bed combined heat and power generation unit as claimed in claim 1, wherein: the entrance of the slag cooler booster pump (2) is provided with an electric isolating valve, the two ends of the heat supply network circulating water pump (8) are respectively provided with the electric isolating valve, and the low-temperature economizer water outlet pipeline (14) close to the heat supply network water supply pipeline (12) is provided with the electric isolating valve.
5. The cascade utilization system of the flue gas and slag waste heat of the circulating fluidized bed combined heat and power generation unit as claimed in claim 1, wherein: and a flue gas inlet of the low-temperature economizer (3) is connected with a flue gas pipeline (17) at an outlet of the air preheater.
6. The cascade utilization system of the flue gas and slag waste heat of the circulating fluidized bed combined heat and power generation unit as claimed in claim 1, wherein: the flue gas outlet of the low-temperature coal economizer (3) is connected with the inlet flue end of the electric dust remover (9), and the outlet flue of the electric dust remover (9) is connected with the draught fan (10).
7. The cascade utilization system of the flue gas and slag waste heat of the circulating fluidized bed combined heat and power generation unit as claimed in claim 1, wherein: the slag cooler (1) is a roller slag cooler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010780507.9A CN111895385A (en) | 2020-08-06 | 2020-08-06 | Circulating fluidized bed combined heat and power generation unit flue gas slag waste heat cascade utilization system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010780507.9A CN111895385A (en) | 2020-08-06 | 2020-08-06 | Circulating fluidized bed combined heat and power generation unit flue gas slag waste heat cascade utilization system |
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| CN111895385A true CN111895385A (en) | 2020-11-06 |
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|---|---|---|---|
| CN202010780507.9A Pending CN111895385A (en) | 2020-08-06 | 2020-08-06 | Circulating fluidized bed combined heat and power generation unit flue gas slag waste heat cascade utilization system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113669716A (en) * | 2021-06-29 | 2021-11-19 | 华能国际电力股份有限公司大连电厂 | Low-temperature economizer and drainage recovery coupling water supply system and method |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113669716A (en) * | 2021-06-29 | 2021-11-19 | 华能国际电力股份有限公司大连电厂 | Low-temperature economizer and drainage recovery coupling water supply system and method |
| CN113669716B (en) * | 2021-06-29 | 2024-03-19 | 华能国际电力股份有限公司大连电厂 | Low-temperature economizer and drainage recovery coupling water supply system and method |
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