CN115307473A - Heat storage system and method utilizing smoke heat of coal-fired boiler - Google Patents
Heat storage system and method utilizing smoke heat of coal-fired boiler Download PDFInfo
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- CN115307473A CN115307473A CN202210961670.4A CN202210961670A CN115307473A CN 115307473 A CN115307473 A CN 115307473A CN 202210961670 A CN202210961670 A CN 202210961670A CN 115307473 A CN115307473 A CN 115307473A
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- flue gas
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- heat exchanger
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- 239000000779 smoke Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims description 10
- 238000005338 heat storage Methods 0.000 title description 14
- 150000003839 salts Chemical class 0.000 claims abstract description 128
- 239000003546 flue gas Substances 0.000 claims abstract description 98
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 96
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000000746 purification Methods 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims description 16
- 239000012528 membrane Substances 0.000 claims description 15
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 4
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 4
- 239000010962 carbon steel Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims 1
- 230000005619 thermoelectricity Effects 0.000 abstract description 3
- 239000012943 hotmelt Substances 0.000 abstract description 2
- 238000010248 power generation Methods 0.000 description 6
- 230000005611 electricity Effects 0.000 description 5
- 206010022000 influenza Diseases 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/028—Steam generation using heat accumulators
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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
-
- 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
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G1/00—Steam superheating characterised by heating method
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
- F28D2020/0047—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material using molten salts or liquid metals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D2020/0065—Details, e.g. particular heat storage tanks, auxiliary members within tanks
- F28D2020/0078—Heat exchanger arrangements
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a system for storing heat by utilizing smoke heat of a coal-fired boiler. The hot side of the flue gas molten salt heat exchanger is communicated with a flue gas channel of the boiler or is arranged in the flue gas channel of the boiler; a cold side inlet of the flue gas molten salt heat exchanger is communicated with an outlet pipeline of the molten salt pump; the outlet of the cold side of the flue gas molten salt heat exchanger is communicated with the inlet of the hot molten salt tank; the outlet of the hot-melt salt tank is sequentially communicated with the hot sides of the superheater, the steam drum, the evaporator and the preheater, and the outlet of the hot side of the preheater is connected with the inlet of the cold salt tank; the cold sides of the preheater, the evaporator, the steam drum and the superheater are sequentially communicated, and a cold side inlet of the preheater is connected with a water feeding pump; the hot side outlet of the flue gas molten salt heat exchanger is connected with a flue gas purification device, so that the heat supply or power supply capacity of the unit under the thermoelectric peak working condition can be improved; the working condition time interval of the thermoelectricity same valley of the unit is reduced, and the operation safety and the economical efficiency of the boiler are improved.
Description
Technical Field
The invention belongs to the field of boiler flue gas heat utilization, and particularly relates to a heat storage system and a heat storage method utilizing flue gas heat of a coal-fired boiler.
Background
With the rapid development of the new energy power generation scale, the deep peak regulation amplitude of the coal-fired thermal power generating unit is increased, and the peak-to-valley electricity price difference of the power grid is increased. At present, the valley electricity price in partial areas is already as low as 0.2 yuan/kWh, and the peak electricity price is already raised to more than 1 yuan/kWh. The boiler flue gas heat is utilized to heat the molten salt and is stored in the tank, and the stored heat can be used for heating and can also be used for power generation or heating.
The economical efficiency, the safety and the environmental protection characteristic of the coal-fired boiler are higher than those of the coal-fired boiler under the low-load operation condition when the coal-fired boiler is operated under the high load. For a cogeneration generator set, both power supply and heat supply have peak-valley periods, and both the power supply and the heat supply may have the same peak and the same valley, or have peak staggering and valley staggering. For a boiler, the demand of heat supply or power generation cannot be met in the same peak time period of heat and electricity, the running economy is poor under the low-load running or deep peak regulation working condition of the boiler, and NO is generated x The difficulty of emission control is high, and the operation safety of equipment is reduced.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a heat storage system and a heat storage method by utilizing the smoke heat of a coal-fired boiler, which improve the heat supply or power supply capacity of a unit under the working condition of the same peak of heat and electricity; the working condition time interval of the thermoelectricity same valley of the unit is reduced, and the operation safety and the economical efficiency of the boiler are improved. For the machine set participating in deep peak regulation, the low-load operation condition and NO are improved x Stability of ultralow emission, and NO for alleviating low-load operation of boiler x The control is difficult.
In order to achieve the purpose, the invention adopts the technical scheme that the system for storing heat by utilizing the smoke heat of the coal-fired boiler comprises a boiler, a smoke fused salt heat exchanger, a cold fused salt tank, a hot fused salt tank, a superheater, an evaporator, a steam drum and a preheater, wherein the hot side of the smoke fused salt heat exchanger is arranged in a smoke channel of the boiler, the cold side inlet of the smoke fused salt heat exchanger is communicated with an outlet pipeline of the fused salt pump, the cold side outlet of the smoke fused salt heat exchanger is communicated with the inlet of the hot fused salt tank, the outlet of the hot fused salt tank is sequentially communicated with the hot sides of the superheater, the steam drum and the preheater, and the hot side outlet of the preheater is connected with the inlet of the cold salt tank; the cold sides of the preheater, the steam pocket, the evaporator and the superheater are sequentially communicated, and a cold side inlet of the preheater is connected with a water feeding pump; and the hot side outlet of the flue gas molten salt heat exchanger is connected with a flue gas purification device.
The outlet of the cold salt tank is provided with a molten salt pump to the flue gas molten salt heat exchanger, or the height of the cold salt tank is integrally higher than that of the flue gas molten salt heat exchanger, and the outlet of the hot salt tank is provided with a high-temperature molten salt pump.
The flue gas purification device adopts the original flue gas purification device of a boiler or is independently provided with a set of flue gas purification device.
When the flue gas fused salt heat exchanger is arranged in a flue gas channel of a boiler, the flue gas fused salt heat exchanger is arranged in a flue between heating surfaces at the hearth and the downstream of flue gas.
A steam outlet of the superheater is connected with a steam utilization device or a steam user, a steam outlet pipeline of the steam utilization device is provided with a temperature and pressure sensor, and a temperature and pressure adjusting device is arranged according to the requirements of steam parameters; the preheater or the evaporator is connected with a heat user; the outlets of the preheater and the evaporator are provided with temperature and temperature sensors.
And the steam outlet of the superheater, the outlets of the preheater and the evaporator are all provided with adjustable valves.
The flue gas fused salt heat exchanger is a commercially available flue gas fused salt heat exchanger or is formed by modifying a heating surface in a flue gas channel of a boiler, and a medium in the heating surface is changed into fused salt.
The flue gas molten salt heat exchanger adopts a membrane wall structure or a cross membrane wall structure, and steel pipes in the membrane wall structure or the cross membrane wall structure adopt carbon steel pipes or alloy steel pipes.
The molten salt pump and the water supply pump are both provided with motor frequency converters for adjusting the medium flow.
According to the method for storing the molten salt by using the heat of the boiler flue gas, the boiler flue gas is introduced into the flue gas molten salt heat exchanger or the flue gas molten salt heat exchanger is placed in a flue gas channel of the boiler, the flue gas and the molten salt exchange heat in the flue gas molten salt heat exchanger, the molten salt and the flue gas exchange heat and rise in temperature to form hot molten salt, the hot molten salt heats the feed water step by step through the preheater, the evaporator, the steam pocket and the superheater, the feed water is heated and boosted to generate hot water and steam to be supplied outwards, and the flue gas enters the flue gas purification device after heat exchange to be purified and then is discharged.
Compared with the prior art, the invention at least has the following beneficial effects: the heat supply or power supply capacity of the unit under the thermoelectric peak working condition is improved. And in the low-load operation period of the unit, a flue gas heat storage system is put into the unit, and fused salt absorbs high-temperature flue gas heat generated by burning coal through a flue gas fused salt heat exchanger and is stored in a hot-melt salt tank. In the peak time of heat supply or power supply of the unit, the hot melting salt releases the stored heat, heats the water supply to the required parameters, can be directly used for heat supply, and can be further converted into electric energy to be supplied to users. The working condition time interval of the thermoelectricity same valley of the unit is reduced. The boiler is in the underload operating mode, and the heat transfer worsens easily to appear, and combustion efficiency is low, the unstable scheduling problem of burning. The boiler stops using the smoke heat storage system when the unit runs at high load, and the smoke heat storage system is put into operation at a low-load power generation time interval of the unit, so that the heat load of the boiler is at a higher level, the extremely low-load operation time interval of the boiler is reduced, and the operation safety and the economical efficiency of the boiler are improved. For the machine set participating in deep peak regulation, the low-load operation condition and NO are improved x Stability of ultra low emissions. At present, due to requirements of relevant policies, most thermal power generating units need to participate in deep peak regulation, low-nitrogen combustion technology is limited when a conventional coal-fired boiler operates at low load, denitration such as SCR deviates from a high-efficiency denitration interval, and NO is easily caused x Unstable ultralow emission and large consumption of denitration reducing agents. In the low-load operation period of the unit, the heat storage system for the flue gas heat during the operation of the boiler can improve the heat load of the boiler and relieve NO x The control is difficult.
Further provides energy-saving, heat supply and flexibility modification requirements for the coal-fired power generation industry. Through the unit transformation, can further reduce carbon emission intensity, improve the economic nature of unit operation, play coal-fired generating set energy pocket end effect. The invention provides a brand-new and reliable device and an implementation method for implementing a 'three-in-one linkage' plan scheme of a thermal power generating unit, and has good environmental, economic and social benefits.
Drawings
FIG. 1 is a schematic diagram of a system in which the present invention may be implemented.
Fig. 2 is a schematic view of a membrane wall.
Fig. 3 is a schematic view of a cross membrane wall.
Fig. 4 is a schematic diagram of another system in which the present invention may be implemented.
In the attached figure, 1-boiler, 2-flue gas molten salt heat exchanger, 3-flue gas purification device, 4-cold molten salt tank, 5-molten salt pump, 6-hot molten salt tank, 7-superheater, 8-evaporator, 9-steam drum, 10-preheater, 11-water supply pump and 12-steam utilization device.
Detailed Description
The present invention is described in detail below with reference to the drawings and examples, which are used for illustrating the present invention, but it should be understood by those skilled in the art that all examples are not to be construed as limiting the present invention. Any modification or variation made within the scope of the present invention is within the scope of the present invention.
Referring to fig. 1, the invention provides a molten salt heat storage system using the flue gas heat of a coal-fired boiler, wherein the flue gas heat is stored in hot water or steam through a flue gas molten salt heat exchanger by arranging the flue gas molten salt heat exchanger outside or in a hearth; the system comprises a flue gas molten salt heat exchanger, a flue gas purification device, a cold molten salt tank, a molten salt pump, a hot molten salt tank, a superheater, a steam drum, an evaporator, a preheater, a water supply pump and a steam utilization device.
One is to lead the flue gas out of the boiler body and establish an independent molten salt heat storage system; the other type is that a flue gas molten salt heat exchanger is arranged in the boiler body, flue gas heat is taken out through flue gas molten salt heat exchange and then stored in a newly arranged heat storage system, and the flue gas heat is converted into hot water or steam for storage.
Referring to fig. 1 and 4, a flue gas molten salt heat exchanger 2 is arranged in a flue of a boiler, a cold side inlet of the flue gas molten salt heat exchanger 2 is communicated with an outlet of a cold salt tank 4 through a molten salt pump 5, a cold side outlet of the flue gas molten salt heat exchanger 2 is communicated with an inlet of a hot salt tank 6, an outlet of the hot salt tank 7 is sequentially communicated with hot sides of a superheater 7, a steam drum 9, an evaporator 8 and a preheater 10, and a hot side outlet of the preheater 10 is connected with an inlet of the cold salt tank 4; the preheater 10, the evaporator 8, the steam drum 9 and the cold side of the superheater 7 are sequentially communicated, the cold side inlet of the preheater 10 is connected with a water feeding pump 11, and the steam outlet of the superheater 7 is communicated with a steam utilization device 12.
Feedwater passes through a feedwater pump 11 and is sent into a preheater 10, an evaporator 8, a steam drum 9 and a superheater 7 through connecting pipelines to generate steam, the generated steam enters a steam utilization device 13, and the steam utilization device 12 is a steam turbine generator unit or steam utilization process equipment in the industrial fields of chemical engineering, papermaking and the like.
The steam or hot water generated by the independent molten salt heat storage system can be used for power generation and heat supply in industrial parks, and meets the heat utilization requirements of industries such as chemical industry, metallurgy, light industry and the like.
The position of the flue gas molten salt heat exchanger 2 can be in a hearth, and can also be arranged at any position of a heating surface in the process that flue gas flows downstream and a connecting flue between each group of heating surface flues, such as a superheater, a reheater, an economizer and an air preheater.
The flue gas purification device 3 can be an original boiler flue gas purification device or a newly added flue gas purification device, and the flue gas purification device adopts a commercially available product.
The flue gas fused salt heat exchanger is arranged in the boiler body, the flue gas fused salt heat exchanger 2 can be a newly-added flue gas fused salt heat exchanger, and the heating surface of the original boiler can be reformed to form the flue gas fused salt heat exchanger 2.
The flue gas molten salt heat exchanger 2 can be used for cooling and protecting a heating surface by using boiler working media.
The flue gas molten salt heat exchanger 2 adopts a membrane wall structure or a cross membrane wall structure, as shown in fig. 2 and 3.
The membrane wall structure of the flue gas molten salt heat exchanger 2 can adopt a carbon steel pipe and also can adopt an alloy steel pipe.
The molten salt heat exchanger 2 for flue gas can be arranged in a hearth, and can also be arranged at any position in the process that the flue gas flows downstream, including heating surfaces such as a superheater, a reheater, an economizer, an air preheater and the like, and connecting flues among all groups of heating surface flues.
Example 1
The flue gas molten salt heat exchanger 2 is arranged in a flue in front of an air preheater of the boiler, and flue gas exchanges heat with molten salt in the flue gas and enters a flue gas purification device 3 matched with the original boiler after being cooled; molten salt from the cold molten salt tank 4 is sent into the flue gas molten salt heat exchanger 2 by the molten salt pump 5 through a connecting channel, is sent into the hot molten salt tank 6 after being heated, is sent into the superheater 7, the steam drum 9 and the preheater 10 through connecting pipelines in sequence, and finally returns to the cold salt tank 4.
The feed water passes through a feed water pump 11 and is sent into a preheater 10, a steam drum 9, an evaporator 8 and a superheater 7 through connecting pipelines to generate steam, and the generated steam enters a steam utilization device 12.
The flue gas molten salt heat exchanger 2 adopts a membrane wall structure, and the heated surface pipe adopts a carbon steel pipe.
Example 2
The flue gas molten salt heat exchanger 2 is arranged in a hearth furnace, and flue gas finally enters an original matched flue gas purification device 3 of the boiler through a heating surface of the boiler.
Molten salt from the cold molten salt tank 4 is sent into the flue gas molten salt heat exchanger 2 by the molten salt pump 5 through a connecting channel, heated and then sent into the hot molten salt tank 6, and then sent into the superheater 7, the steam drum 9 and the preheater 10 through connecting pipelines in sequence, and finally returned into the cold salt tank 4; feed water passes through a feed water pump 11 and is sent into a preheater 10, a steam drum 9, an evaporator 8 and a superheater 7 through connecting pipelines to generate steam, and the generated steam enters a steam utilization device 12.
The flue gas molten salt heat exchanger 2 adopts a cross membrane type wall structure, and the heating surface pipe adopts an alloy steel pipe.
Claims (10)
1. The system is characterized by comprising a boiler (1), a flue gas molten salt heat exchanger (2), a cold molten salt tank (4), a hot molten salt tank (6), a superheater (7), an evaporator (8), a steam drum (9) and a preheater (10), wherein the hot side of the flue gas molten salt heat exchanger (2) is arranged in a flue gas channel of the boiler (1), the cold side inlet of the flue gas molten salt heat exchanger (2) is communicated with an outlet pipeline of a molten salt pump (5), the cold side outlet of the flue gas molten salt heat exchanger (2) is communicated with the inlet of the hot molten salt tank (6), the outlet of the hot molten salt tank (6) is sequentially communicated with the superheater (7), the steam drum (9) and the preheater (10), and the hot side outlet of the preheater (10) is connected with the inlet of the cold molten salt tank (4); the cold sides of the preheater (10), the steam drum (9), the evaporator (8) and the superheater (7) are sequentially communicated, and a cold side inlet of the preheater (10) is connected with a water feeding pump (11); the hot side outlet of the flue gas molten salt heat exchanger (2) is connected with a flue gas purification device (3).
2. The system for storing heat by utilizing the smoke heat of the coal-fired boiler according to claim 1, wherein a molten salt pump (5) is arranged from the outlet of the cold salt tank (4) to the smoke molten salt heat exchanger (2), or the cold salt tank (4) is integrally higher than the smoke molten salt heat exchanger (2), and a high-temperature molten salt pump is arranged at the outlet of the hot salt tank (6).
3. The system for storing heat by utilizing the smoke heat of the coal-fired boiler as claimed in claim 1, wherein the smoke purification device (3) adopts an original smoke purification device of the boiler or is provided with a set of smoke purification device independently.
4. The system for storing heat by utilizing the smoke heat of the coal-fired boiler according to claim 1, wherein when the smoke molten salt heat exchanger (2) is arranged in a smoke channel of the boiler (1), the smoke molten salt heat exchanger (2) is arranged in a flue between heating surfaces at the hearth and the downstream of smoke.
5. The system for storing heat by utilizing the smoke heat of the coal-fired boiler as claimed in claim 1, wherein a steam outlet of the superheater (7) is connected with a steam utilization device (12) or a steam user, a steam outlet pipeline of the steam utilization device (12) is provided with a temperature and pressure sensor, and a temperature and pressure adjusting device is arranged according to the requirement of steam parameters; the preheater (10) or the evaporator (8) is connected with a heat user; the outlets of the preheater (10) and the evaporator (8) are provided with temperature and temperature sensors.
6. The system for storing heat by utilizing the smoke heat of the coal-fired boiler as claimed in claim 6, wherein the steam outlet of the superheater (7), the outlet of the preheater (10) and the outlet of the evaporator (8) are provided with adjustable valves.
7. The system for storing heat by utilizing the smoke heat of the coal-fired boiler according to claim 1, wherein the smoke molten salt heat exchanger (2) is a commercially available smoke molten salt heat exchanger or is formed by modifying a heating surface in a smoke channel of the boiler, and a medium in the heating surface is changed into molten salt.
8. The system for storing heat by utilizing the smoke heat of the coal-fired boiler according to claim 1, wherein the smoke molten salt heat exchanger (2) is of a membrane wall structure or a cross membrane wall structure, and steel pipes in the membrane wall structure or the cross membrane wall structure are carbon steel pipes or alloy steel pipes.
9. The system for storing heat by utilizing the smoke heat of the coal-fired boiler as claimed in claim 1, wherein both the molten salt pump (5) and the water feed pump (11) are provided with a motor frequency converter for regulating the medium flow.
10. The method for storing heat of molten salt by using heat of boiler flue gas based on the system of any one of claims 1 to 9 is characterized in that the boiler flue gas is introduced into the flue gas molten salt heat exchanger (2) or the flue gas molten salt heat exchanger (2) is placed into a flue gas channel of the boiler, heat exchange is carried out between the flue gas and the molten salt in the flue gas molten salt heat exchanger, the molten salt and the flue gas heat exchange and temperature rise to form hot molten salt, the hot molten salt heats the feed water step by step through the preheater (10), the evaporator (8), the steam pocket (9) and the superheater (7), the feed water is heated and boosted to generate hot water and steam, the hot water and the steam are supplied outwards, and the flue gas enters the flue gas purification device (3) after heat exchange and is purified and then is discharged.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210961670.4A CN115307473A (en) | 2022-08-11 | 2022-08-11 | Heat storage system and method utilizing smoke heat of coal-fired boiler |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210961670.4A CN115307473A (en) | 2022-08-11 | 2022-08-11 | Heat storage system and method utilizing smoke heat of coal-fired boiler |
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| GB1355952A (en) * | 1972-01-22 | 1974-06-12 | Sulzer Ag | Combined gas turbine set steam power plant |
| CN110220388A (en) * | 2019-03-27 | 2019-09-10 | 北京中冶设备研究设计总院有限公司 | A kind of converter gas waste heat recovery device and method |
| CN111928228A (en) * | 2020-09-03 | 2020-11-13 | 西安热工研究院有限公司 | Power station boiler high-temperature flue gas coupling reheat steam heat storage deep peak regulation system and method |
| US20210016224A1 (en) * | 2019-03-11 | 2021-01-21 | Xi'an Jiaotong University | All-condition auxiliary denitration system and operation method thereof |
| CN212902702U (en) * | 2020-08-26 | 2021-04-06 | 裕润丰(天津)科技有限公司 | Steelmaking converter flue gas waste heat recovery system |
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2022
- 2022-08-11 CN CN202210961670.4A patent/CN115307473A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1355952A (en) * | 1972-01-22 | 1974-06-12 | Sulzer Ag | Combined gas turbine set steam power plant |
| US20210016224A1 (en) * | 2019-03-11 | 2021-01-21 | Xi'an Jiaotong University | All-condition auxiliary denitration system and operation method thereof |
| CN110220388A (en) * | 2019-03-27 | 2019-09-10 | 北京中冶设备研究设计总院有限公司 | A kind of converter gas waste heat recovery device and method |
| CN212902702U (en) * | 2020-08-26 | 2021-04-06 | 裕润丰(天津)科技有限公司 | Steelmaking converter flue gas waste heat recovery system |
| CN111928228A (en) * | 2020-09-03 | 2020-11-13 | 西安热工研究院有限公司 | Power station boiler high-temperature flue gas coupling reheat steam heat storage deep peak regulation system and method |
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