CN109945174B - Slag flushing water closed circulation utilization system of liquid slag discharging boiler - Google Patents
Slag flushing water closed circulation utilization system of liquid slag discharging boiler Download PDFInfo
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- CN109945174B CN109945174B CN201910270762.6A CN201910270762A CN109945174B CN 109945174 B CN109945174 B CN 109945174B CN 201910270762 A CN201910270762 A CN 201910270762A CN 109945174 B CN109945174 B CN 109945174B
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- 239000002893 slag Substances 0.000 title claims abstract description 147
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 138
- 238000011010 flushing procedure Methods 0.000 title claims abstract description 99
- 239000007788 liquid Substances 0.000 title claims abstract description 29
- 238000007599 discharging Methods 0.000 title claims abstract description 17
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000003546 flue gas Substances 0.000 claims abstract description 42
- 238000001704 evaporation Methods 0.000 claims abstract description 35
- 239000002918 waste heat Substances 0.000 claims abstract description 29
- 238000005057 refrigeration Methods 0.000 claims abstract description 21
- 239000002250 absorbent Substances 0.000 claims description 32
- 239000003507 refrigerant Substances 0.000 claims description 25
- 230000008020 evaporation Effects 0.000 claims description 24
- 239000000779 smoke Substances 0.000 claims description 21
- 238000010521 absorption reaction Methods 0.000 claims description 19
- 239000003245 coal Substances 0.000 claims description 14
- 238000010079 rubber tapping Methods 0.000 claims description 13
- 238000009833 condensation Methods 0.000 claims description 12
- 230000005494 condensation Effects 0.000 claims description 11
- 238000002485 combustion reaction Methods 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 9
- 238000004062 sedimentation Methods 0.000 claims description 9
- 238000005192 partition Methods 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 238000005469 granulation Methods 0.000 claims description 3
- 230000003179 granulation Effects 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims 2
- 235000017491 Bambusa tulda Nutrition 0.000 claims 2
- 241001330002 Bambuseae Species 0.000 claims 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims 2
- 239000011425 bamboo Substances 0.000 claims 2
- 125000004122 cyclic group Chemical group 0.000 claims 1
- 238000004064 recycling Methods 0.000 abstract description 8
- 238000001816 cooling Methods 0.000 abstract description 6
- 238000011084 recovery Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000001556 precipitation Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000003287 bathing Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- -1 otherwise Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
Landscapes
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Gasification And Melting Of Waste (AREA)
Abstract
The utility model discloses a closed circulation utilization system of slag flushing water of a liquid slag discharging boiler, which comprises a cyclone, a slag pool and a granulating water tank which are sequentially connected from top to bottom, wherein a slag flushing water outlet and a slag flushing water inlet are arranged on the granulating water tank; the slag flushing water circulating pipeline is also connected with a flue gas waste heat refrigeration circulating device, and the flue gas waste heat refrigeration circulating device comprises a generating chamber, an absorbing chamber, an evaporating chamber and a condensing chamber. The utility model utilizes the waste heat of the tail flue gas of the liquid slag discharging boiler to prepare cold energy, and the flue gas waste heat refrigeration cycle device is used for preparing cold energy, and the obtained cold energy is used for cooling the liquid slag discharging and flushing water of the cyclone cylinder, thereby effectively utilizing waste heat resources, reducing heat loss of the flue gas discharged by the boiler, recycling the flushing water for multiple times and saving water resources.
Description
Technical Field
The utility model relates to the field of slag tapping boilers and power plant water conservation, in particular to a slag flushing water closed type recycling system of a slag tapping boiler.
Background
The cyclone furnace is a slag tapping boiler and is used in heat-engine plant. The cyclone combustion mode is that in a cylindrical combustion chamber (cyclone), coal particles are thrown to a cylinder wall by utilizing the high-speed rotation effect of air flow, the coal particles are combusted in the cylinder wall and a space near the cylinder wall to form a high-temperature area, so that ash slag is melted, part of the ash slag is stuck on the cylinder wall, and the air flow and the coal particles stuck on a liquid slag film have high relative speed, so that the fuel and the air are fully mixed and are intensively combusted.
Because the special liquid slag discharging mode of the cyclone furnace needs to control the temperature of ash to be in a molten state, so that the ash is attached to the wall surface of the cyclone cylinder and is discharged freely under the action of gravity, the ash temperature is very high, and the ash temperature needs to be reduced by adopting a proper temperature reduction mode so as to be discharged normally.
The liquid slag is granulated and emits a large amount of heat, the temperature of the slag flushing water is increased sharply due to the fact that the heat is absorbed by the slag flushing water, the temperature of the slag flushing water reaches 85 ℃, the granulated slag flushing water is not suitable for granulating the liquid slag again due to the fact that the temperature is too high, new slag flushing water is needed to be supplemented for granulating the liquid slag, otherwise, slag forming and contamination in a granulating water tank can be caused due to the fact that the slag granulating temperature is too high, and safe operation of a cyclone furnace is seriously affected, so that proper slag flushing water must be used.
For the liquid slag-discharging boiler, the combustion in the boiler is severe, the reaction is thorough, the temperature during combustion is higher than that of a common solid slag-discharging boiler, the temperature of the tail smoke of the boiler is higher than that of other boilers, and if the smoke is not utilized, a large amount of heat loss can be caused, so that the heat efficiency of the boiler is affected. Therefore, how to utilize the part of waste heat flue gas is also a research hot spot.
The utility model patent with publication number of CN208536339U discloses an energy recovery device and an energy recovery method, wherein the energy recovery device comprises a water circulation unit, and further comprises a water inlet pipeline, a water outlet pipeline and an intermediate pipeline, wherein the water inlet pipeline, the water outlet pipeline and the intermediate pipeline are connected with an energy generation device and form a closed circulation waterway; and the heat exchange unit is connected with the water inlet pipeline, can perform multi-stage heat exchange in the pipeline, and outputs heat energy for a user to use. The utility model has the beneficial effects that: by recovering the waste heat of the high-temperature compressed air, a large amount of hot water is generated for heating, bathing pools and dining halls of factories or residential areas, and the part of energy is recovered and fed back to users, so that the recycling rate of energy sources is improved, and the waste of the energy sources is reduced; meanwhile, the energy consumption and the air pollution caused by the consumption of a large amount of fuel such as coal or gas and the like when the boiler heats and supplies hot water to heat cold water are effectively solved.
The utility model patent with publication number of CN109282280A discloses a circulating fluidized bed boiler air-water combined slag heat recovery system and a control method thereof. The air-water combined slag heat recovery system comprises a closed circulation subsystem, a cold air heating subsystem and an air preheater bypass subsystem, wherein the closed circulation subsystem reciprocates a circulation medium between a slag cooler and a warm air heater of the cold air heating subsystem through a circulation device, so that slag and cold air are subjected to heat exchange continuously, the warmed cold air is conveyed to the air preheater to continuously absorb smoke heat from a boiler smoke outlet, and redundant smoke heat is sequentially conveyed to a water supply heat exchanger and a condensate heat exchanger in the air preheater bypass subsystem, so that the smoke heat is subjected to heat exchange with water supply and condensate. The system for recovering the slag heat by combining the wind and the water of the circulating fluidized bed boiler and the control method thereof provided by the utility model have higher recovery and utilization rate of the slag heat, thereby improving the efficiency of the circulating fluidized bed boiler and reducing the power generation and coal consumption of a unit.
However, the technical scheme still cannot realize the linkage circulation of tail flue gas of the slag discharging boiler and slag flushing water of the slag tapping boiler.
Disclosure of Invention
The utility model provides a closed circulation utilization system of slag flushing water of a slag tapping boiler, which can effectively utilize waste heat flue gas at the tail of the boiler to refrigerate, and the prepared cold energy is used for cooling the slag flushing water of the slag tapping boiler, so that the heat loss of smoke discharged by the boiler is reduced, and the slag flushing water can be recycled for multiple times, and water resources are saved.
In order to solve the technical problems, the utility model adopts the following technical scheme:
the closed circulation utilization system of slag flushing water of the liquid slag discharging boiler comprises a cyclone, a slag pool and a granulating water tank which are sequentially connected from top to bottom, wherein a slag flushing water outlet and a slag flushing water inlet are arranged on the granulating water tank, flue gas of the cyclone is discharged through a smoke outlet of a hearth, the closed circulation utilization system also comprises a sedimentation filter tank, the slag flushing water outlet is connected with the sedimentation filter tank, the upper part of the sedimentation filter tank is connected with a slag flushing water circulation pipeline, and the other end of the slag flushing water circulation pipeline is led to the slag flushing water outlet;
the slag flushing water circulating pipeline is also connected with a flue gas waste heat refrigeration circulating device, and the flue gas waste heat refrigeration circulating device comprises a generation chamber, an absorption chamber, an evaporation chamber and a condensation chamber;
a generating heat exchanger is arranged in the generating chamber, one end of the generating heat exchanger is connected with a smoke outlet of the hearth, smoke passes through the generating heat exchanger after coming out of the smoke outlet of the hearth, and a refrigerant-absorbent solution is filled in a cavity of the generating chamber;
the top of the generation chamber is connected with a high-pressure refrigeration steam pipeline, the high-pressure refrigeration steam pipeline is connected with a steam inlet of the condensation chamber, a liquid outlet of the condensation chamber is connected with the evaporation chamber through a refrigerant pipeline, and an expansion valve is arranged on the refrigerant pipeline;
the evaporation chamber is in heat exchange connection with the slag flushing water circulation pipeline, and the refrigerant-absorbent solution entering the evaporation chamber after passing through the expansion valve absorbs the heat of the slag flushing water circulation pipeline to form low-pressure refrigerant steam;
the bottom of the generation chamber is connected with a refrigerant-absorbent concentrated solution conveying pipeline which is connected with the absorption chamber; the upper part of the evaporating chamber is connected with the gas inlet of the absorbing chamber through a low-pressure refrigerant vapor channel, the low-pressure refrigerant vapor entering the absorbing chamber is absorbed by the refrigerant-absorbent concentrated solution, the refrigerant-absorbent dilute solution is formed in the absorbing chamber, and the refrigerant-absorbent dilute solution is conveyed and flows back to the generating chamber through a refrigerant-absorbent dilute solution conveying pipeline.
The condensing chamber is in heat transfer connection with the generating heat exchanger, and heat collected by the condensing chamber is transmitted to the generating heat exchanger.
The refrigerant-absorbent dilute solution conveying pipeline is provided with a solution circulating pump.
And a throttle valve is arranged on the refrigerant-absorbent concentrated solution conveying pipeline.
And a slag flushing water circulating pump is arranged on the slag flushing water circulating pipeline.
The evaporation chamber and the absorption chamber are positioned in one chamber body, a partition plate is arranged in the chamber body to divide the chamber body into the evaporation chamber and the absorption chamber, and a low-pressure refrigerant steam channel is formed at the upper part of the partition plate.
And a filtering structure for filtering impurities is arranged at the low-pressure refrigerant steam channel.
The slag flushing water circulation pipeline is contacted and passed through the wall surface of the evaporating chamber, and the slag flushing water circulation pipeline and the evaporating chamber form contact heat exchange.
The cyclone cylinder comprises a primary air inlet arranged above the cyclone cylinder and a secondary air inlet arranged on the wall surface of the cyclone cylinder, wherein the primary air inlet is used for carrying pulverized coal particles into the cyclone cylinder, and the secondary air inlet tangentially enters the cyclone cylinder and is used for supplementing oxygen required by the combustion of the pulverized coal particles.
And the furnace chamber is provided with an economizer at the smoke outlet.
The beneficial effects of the utility model are as follows:
the utility model utilizes the waste heat of the tail flue gas of the liquid slag discharging boiler to prepare cold energy, and the flue gas waste heat refrigeration cycle device is used for preparing cold energy, and the obtained cold energy is used for cooling the liquid slag discharging and flushing water of the cyclone cylinder, thereby effectively utilizing waste heat resources, reducing heat loss of the flue gas discharged by the boiler, recycling the flushing water for multiple times and saving water resources.
The utility model utilizes the tail flue gas of the boiler, and uses the flue gas waste heat refrigeration cycle device to prepare cold energy, thereby reducing the heat loss of the discharged flue gas of the boiler and improving the heat efficiency of the boiler.
The utility model uses the obtained cold energy to cool the slag flushing water with gradually increased temperature, thereby effectively improving the recycling times of the slag flushing water and saving water resources.
The utility model can ensure that slag flushing water can be used for a long time on the premise of normal and safe operation of the boiler, saves water resources, reduces heat loss of the boiler exhaust smoke and improves the boiler efficiency.
Drawings
Fig. 1 is an overall schematic diagram of an embodiment of the present utility model.
Reference numerals illustrate:
the device comprises a 1-cyclone, a 2-hearth, a 3-primary air inlet, a 4-secondary air inlet, a 5-slag pool, a 6-slag flushing water inlet, a 7-granulating water tank, an 8-slag flushing water circulating pipeline, a 9-slag flushing water circulating pump, a 10-precipitation filter tank, an 11-economizer, a 12-generation chamber, a 13-condensation chamber, a 14-evaporation chamber, a 15-absorption chamber, a 16-solution circulating pump, a 17-throttle valve, a 18-wall surface, a 19-partition plate, a 20-expansion valve and a 21-slag flushing water outlet.
Detailed Description
The following describes the embodiments of the present utility model in detail with reference to the drawings.
As shown in fig. 1, the closed circulation utilization system of slag flushing water of the liquid slag discharging boiler comprises a cyclone 1, a slag pool 5, a granulating water tank 7 and a precipitation filtering pool 10 which are sequentially connected from top to bottom.
The cyclone 1 comprises a primary air inlet 3 arranged above the cyclone and a secondary air inlet 4 arranged on the wall surface of the cyclone. The primary air inlet is used for carrying pulverized coal particles into the cyclone cylinder 1, and the jet flow mode can be various, for example, a direct-current combustion mode or a swirl combustion mode. The secondary air inlet 4 tangentially enters the cyclone cylinder 1 and is used for supplementing oxygen required by the combustion of pulverized coal particles.
The slag pool 5 is arranged below the cyclone 1 and is used for storing liquid ash discharged from the cyclone 1, and the liquid ash is discharged from the gap after being accumulated to a certain height.
The granulation water tank 7 is arranged below the slag bath 5 for cooling the liquid ash for safe discharge. The granulating water tank 7 is provided with a slag flushing water outlet 21 and a slag flushing water inlet 6, and the slag flushing water inlet 6 is used for providing cooling water of liquid slag.
The sedimentation filter tank 10 is connected to a slag flushing water outlet 21 of the granulating water tank 7 for sedimentation of the cooled slag.
The slag flushing water outlet 21 is connected with the precipitation filter tank 10, the upper part of the precipitation filter tank 10 is connected with a slag flushing water circulating pipeline 8, a slag flushing water circulating pump 9 is arranged on the slag flushing water circulating pipeline 8, the other end of the slag flushing water circulating pipeline 8 is led to the slag flushing water outlet 6, and slag flushing water is conveyed back to the granulating water tank 7 for recycling.
The flue gas of the cyclone cylinder 1 is discharged through the flue gas outlet of the hearth 2, and the flue gas outlet of the hearth 2 is also provided with an economizer 11. The slag flushing water circulating pipeline 8 is also connected with a flue gas waste heat refrigeration circulating device, and the flue gas waste heat refrigeration circulating device utilizes flue gas at the tail of the boiler to prepare cold energy by using flue gas waste heat.
The specific working process of the utility model is as follows:
the primary air carries pulverized coal to enter the cyclone cylinder 1 from a primary air inlet 3 above the cyclone cylinder, the pulverized coal can be high-alkali coal, severe combustion reaction occurs under the action of secondary air to generate high-temperature ash, the high-temperature ash enters the slag melting tank 5 along the inner wall of the cyclone cylinder 1 under the action of gravity, the high-temperature ash is cooled and granulated in the granulating water tank 7 through cooling of slag flushing water, the temperature of the slag flushing water rises, the slag flushing water enters the sedimentation tank 10 through a slag flushing water outlet 21 to sediment the ash, the slag flushing water absorbs cold energy produced by a flue gas waste heat refrigerating cycle device in a slag flushing water circulation pipeline 8, the slag flushing water is cooled, and the cooled slag flushing water returns to the granulating water tank 7 again under the action of a slag flushing water circulation pump 9 to complete one cycle.
The utility model solves the problems of low cycle use times of slag flushing water of the liquid slag discharging boiler and low granulating rate of the liquid slag after cycle use, and utilizes flue gas at the tail of the boiler to prepare cold energy, and carries out heat exchange treatment on the slag flushing water with gradually increased temperature so as to achieve the cycle use of the slag flushing water.
The flue gas waste heat refrigeration cycle device comprises a generation chamber 12, an absorption chamber 15, an evaporation chamber 14 and a condensation chamber 13.
The generating chamber 12 is internally provided with a generating heat exchanger, one end of the generating heat exchanger is connected with a smoke outlet of the hearth 2, smoke passes through the generating heat exchanger after coming out of the smoke outlet of the hearth 2, and the chamber of the generating chamber is also filled with refrigerant-absorbent solution. The generating heat exchanger can be a dividing wall type heat exchanger, in particular a plate type heat exchanger or a tubular heat exchanger, and is made of corrosion-resistant steel. The refrigerant-absorbent solution may be a lithium bromide solution.
The top of the generation chamber 12 is connected with a high-pressure refrigeration steam pipeline, the high-pressure refrigeration steam pipeline is connected with a steam inlet of the condensation chamber 13, a liquid outlet of the condensation chamber 13 is connected with the evaporation chamber 14 through a refrigerant pipeline, and an expansion valve 20 is arranged on the refrigerant pipeline.
The evaporation chamber 14 is in heat exchange connection with the slag flushing water circulation pipeline 8, and in the embodiment, the slag flushing water circulation pipeline 8 passes through the wall surface 18 of the evaporation chamber 14 in a contact manner, and the two form contact heat exchange. A plurality of slag flushing water circulation pipes can be arranged in the evaporation chamber 14. The refrigerant-absorbent solution entering the evaporation chamber 14 after passing through the expansion valve 20 absorbs heat of the slag water circulation line 8 to form low-pressure refrigerant vapor.
The bottom of the generation chamber 12 is connected with a refrigerant-absorbent concentrated solution delivery pipe, which is connected with the absorption chamber 15 and is provided with a throttle valve 17. The upper part of the evaporating chamber 14 is connected with the gas inlet of the absorbing chamber 15 through a low-pressure refrigerant vapor channel, the low-pressure refrigerant vapor entering the absorbing chamber 15 is absorbed by the refrigerant-absorbent concentrated solution, the refrigerant-absorbent diluted solution is formed in the absorbing chamber 15 and is conveyed and flows back to the generating chamber 12 through a refrigerant-absorbent diluted solution conveying pipeline, and the refrigerant-absorbent diluted solution conveying pipeline is provided with a solution circulating pump 16.
In this embodiment, the condensation chamber 13 is in heat transfer connection with the generating heat exchanger, and the heat collected by the condensation chamber 13 is transferred to the generating heat exchanger and mixed with the flue gas waste heat, so that the heat can be further utilized.
In this embodiment, the evaporation chamber 14 and the absorption chamber 15 are located in a chamber body, and a partition 19 is provided in the chamber body to divide the chamber body into the evaporation chamber and the absorption chamber, so that the vacuum degree of the evaporation chamber and the absorption chamber can be ensured at the same time. And the upper portion of the partition 19 forms a low-pressure refrigerant vapor passage where a filtering structure for filtering impurities is provided.
The heat of the slag flushing water is transferred into the evaporating chamber through the wall surface 18 of the evaporating chamber 14, the refrigerant-absorbent solution absorbs the heat of the slag flushing water circulating pipeline 8 to form low-pressure refrigerant steam, and the low-pressure refrigerant steam enters the absorbing chamber 15 through the low-pressure refrigerant steam channel on the partition plate 19. The filter structure is provided to prevent impurities in the evaporation chamber 14 from entering the solution in the absorption chamber 15 and to prevent the absorbent from being contaminated.
The working process of the flue gas waste heat refrigeration cycle device is as follows:
the boiler tail flue gas from the economizer 11 enters the generating chamber 12, meanwhile, the refrigerant-absorbent dilute solution enters the generating chamber 12 under the action of the solution circulating pump 16, the waste heat of the flue gas is absorbed in the generating chamber 12, the high-pressure refrigerant steam enters the condensing chamber 13, the high-pressure refrigerant steam is condensed into liquid by cooling water, the liquid is expanded to low pressure through the expansion valve 20 and then enters the evaporating chamber 14 to absorb the heat of slag flushing water, the refrigerant-absorbent concentrated solution in the generating chamber 12 returns to the absorbing chamber 15 through the throttle valve 17, and the refrigerant-absorbent concentrated solution becomes the refrigerant-absorbent dilute solution after being diluted.
In this embodiment, since the waste heat source is the tail flue gas of the boiler, and has certain impurities, corrosion may occur to the pipeline, and thus corrosion prevention treatment needs to be performed on the flue gas inlet and outlet pipeline.
One evaporation chamber and one absorption chamber can also be a group, and can be arranged in parallel at the same time.
The utility model utilizes the waste heat of the tail flue gas of the liquid slag discharging boiler to prepare cold energy, and the flue gas waste heat refrigeration cycle device is used for preparing cold energy, and the obtained cold energy is used for cooling the liquid slag discharging and flushing water of the cyclone cylinder, thereby effectively utilizing waste heat resources, reducing heat loss of the flue gas discharged by the boiler, recycling the flushing water for multiple times and saving water resources.
The utility model utilizes the tail flue gas of the boiler, and uses the flue gas waste heat refrigeration cycle device to prepare cold energy, thereby reducing the heat loss of the discharged flue gas of the boiler and improving the heat efficiency of the boiler.
The utility model uses the obtained cold energy to cool the slag flushing water with gradually increased temperature, thereby effectively improving the recycling times of the slag flushing water and saving water resources.
The utility model can ensure that slag flushing water can be used for a long time on the premise of normal and safe operation of the boiler, saves water resources, reduces heat loss of the boiler exhaust smoke and improves the boiler efficiency.
The above embodiments are only for illustrating the technical solution of the present utility model, and it should be understood by those skilled in the art that although the present utility model has been described in detail with reference to the above embodiments: modifications and equivalents may be made thereto without departing from the spirit and scope of the utility model, which is intended to be encompassed by the claims.
Claims (8)
1. Slag flushing water closed type cyclic utilization system of liquid slag discharging boiler, including from top to bottom connect gradually the whirlwind section of thick bamboo that arranges, slag pool and granulation water tank, establish slag flushing water export and slag flushing water entry on the granulation water tank, the flue gas of whirlwind section of thick bamboo is discharged through furnace's exhaust port, its characterized in that: the device also comprises a sedimentation filter tank, wherein a slag flushing water outlet is connected with the sedimentation filter tank, the upper part of the sedimentation filter tank is connected with a slag flushing water circulating pipeline, and the other end of the slag flushing water circulating pipeline is guided to the slag flushing water outlet;
the slag flushing water circulating pipeline is also connected with a flue gas waste heat refrigeration circulating device, and the flue gas waste heat refrigeration circulating device comprises a generation chamber, an absorption chamber, an evaporation chamber and a condensation chamber;
a generating heat exchanger is arranged in the generating chamber, one end of the generating heat exchanger is connected with a smoke outlet of the hearth, smoke passes through the generating heat exchanger after coming out of the smoke outlet of the hearth, and a refrigerant-absorbent solution is filled in a cavity of the generating chamber;
the top of the generation chamber is connected with a high-pressure refrigeration steam pipeline, the high-pressure refrigeration steam pipeline is connected with a steam inlet of the condensation chamber, a liquid outlet of the condensation chamber is connected with the evaporation chamber through a refrigerant pipeline, and an expansion valve is arranged on the refrigerant pipeline;
the evaporation chamber is in heat exchange connection with the slag flushing water circulation pipeline, and the refrigerant-absorbent solution entering the evaporation chamber after passing through the expansion valve absorbs the heat of the slag flushing water circulation pipeline to form low-pressure refrigerant steam;
the bottom of the generation chamber is connected with a refrigerant-absorbent concentrated solution conveying pipeline which is connected with the absorption chamber; the upper part of the evaporation chamber is connected with a gas inlet of the absorption chamber through a low-pressure refrigerant vapor channel, low-pressure refrigerant vapor entering the absorption chamber is absorbed by a refrigerant-absorbent concentrated solution, a refrigerant-absorbent dilute solution is formed in the absorption chamber, and the refrigerant-absorbent dilute solution is conveyed and flows back to the generation chamber through a refrigerant-absorbent dilute solution conveying pipeline;
the evaporation chamber and the absorption chamber are positioned in a chamber body, a partition plate is arranged in the chamber body to divide the chamber body into the evaporation chamber and the absorption chamber, and a low-pressure refrigerant steam channel is formed at the upper part of the partition plate;
the cyclone cylinder comprises a primary air inlet arranged above the cyclone cylinder and a secondary air inlet arranged on the wall surface of the cyclone cylinder, wherein the primary air inlet is used for carrying pulverized coal particles into the cyclone cylinder, and the secondary air inlet tangentially enters the cyclone cylinder and is used for supplementing oxygen required by the combustion of the pulverized coal particles.
2. The closed cycle utilization system of slag flushing water of a slag tapping boiler according to claim 1, wherein: the condensing chamber is in heat transfer connection with the generating heat exchanger, and heat collected by the condensing chamber is transmitted to the generating heat exchanger.
3. The closed cycle utilization system of slag flushing water of a slag tapping boiler according to claim 1, wherein: the refrigerant-absorbent dilute solution conveying pipeline is provided with a solution circulating pump.
4. The closed cycle utilization system of slag flushing water of a slag tapping boiler according to claim 1, wherein: and a throttle valve is arranged on the refrigerant-absorbent concentrated solution conveying pipeline.
5. The closed cycle utilization system of slag flushing water of a slag tapping boiler according to claim 1, wherein: and a slag flushing water circulating pump is arranged on the slag flushing water circulating pipeline.
6. The closed cycle utilization system of slag flushing water of a slag tapping boiler according to claim 1, wherein: and a filtering structure for filtering impurities is arranged at the low-pressure refrigerant steam channel.
7. The closed cycle utilization system of slag flushing water of a slag tapping boiler according to claim 1, wherein: the slag flushing water circulation pipeline is contacted and passed through the wall surface of the evaporating chamber, and the slag flushing water circulation pipeline and the evaporating chamber form contact heat exchange.
8. The closed cycle utilization system of slag flushing water of a slag tapping boiler according to claim 1, wherein: and the furnace chamber is provided with an economizer at the smoke outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910270762.6A CN109945174B (en) | 2019-04-04 | 2019-04-04 | Slag flushing water closed circulation utilization system of liquid slag discharging boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910270762.6A CN109945174B (en) | 2019-04-04 | 2019-04-04 | Slag flushing water closed circulation utilization system of liquid slag discharging boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109945174A CN109945174A (en) | 2019-06-28 |
| CN109945174B true CN109945174B (en) | 2024-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910270762.6A Active CN109945174B (en) | 2019-04-04 | 2019-04-04 | Slag flushing water closed circulation utilization system of liquid slag discharging boiler |
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| CN115823578B (en) * | 2022-11-24 | 2023-11-17 | 四川川锅锅炉有限责任公司 | Two-stage cyclone liquid slag condensing boiler for burning high-alkali coal |
| CN115920522A (en) * | 2022-12-09 | 2023-04-07 | 鞍钢股份有限公司 | Recycling system and process method for slag flushing discharged water |
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