CN114857975A - Steam solid heat storage system - Google Patents

Steam solid heat storage system Download PDF

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Publication number
CN114857975A
CN114857975A CN202210616817.6A CN202210616817A CN114857975A CN 114857975 A CN114857975 A CN 114857975A CN 202210616817 A CN202210616817 A CN 202210616817A CN 114857975 A CN114857975 A CN 114857975A
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CN
China
Prior art keywords
heat
steam
solid
valve
air duct
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Pending
Application number
CN202210616817.6A
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Chinese (zh)
Inventor
朱建新
朱宇辉
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Shenyang Shijie Electric Co ltd
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Shenyang Shijie Electric Co ltd
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Filing date
Publication date
Application filed by Shenyang Shijie Electric Co ltd filed Critical Shenyang Shijie Electric Co ltd
Publication of CN114857975A publication Critical patent/CN114857975A/en
Pending legal-status Critical Current

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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
    • F28D20/0056—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using solid heat storage material
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28B—STEAM OR VAPOUR CONDENSERS
    • F28B11/00—Controlling arrangements with features specially adapted for condensers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28B—STEAM OR VAPOUR CONDENSERS
    • F28B5/00—Condensers employing a combination of the methods covered by main groups F28B1/00 and F28B3/00; Other condensers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28B—STEAM OR VAPOUR CONDENSERS
    • F28B9/00—Auxiliary systems, arrangements, or devices
    • F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
    • 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
    • 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
    • F28D2020/0082—Multiple tanks arrangements, e.g. adjacent tanks, tank in tank
    • 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)
  • Other Air-Conditioning Systems (AREA)
  • Sorption Type Refrigeration Machines (AREA)

Abstract

A vapor solid thermal storage system, comprising: solid heat accumulator, heat exchanger congeals the water pitcher, and the vapour collecting tank, governing valve, circulation wind channel, drive fan group, the valve, the technical essential is: a driving fan set, a fin heat exchanger and a solid heat accumulator are sequentially arranged in a closed loop of the circulating air duct; an auxiliary air duct is connected in parallel with the circulating air ducts on the two sides of the solid heat accumulator, and an air adjusting door is arranged on the auxiliary air duct; two ports of the fin heat exchanger are respectively connected with the water condensation tank and the steam collection tank; the steam collecting tank is respectively connected with the steam input port and the saturated steam output port through valves; the outlet of the condensate tank is connected with the high-temperature condensate outlet through a valve and a pressure regulating valve in sequence; and the inlet of the condensate tank is connected with the pressure water inlet through a valve. In the system heat storage and release cycle, air is used as a heat conduction cross-linking medium between the heat release end and the heat absorption end, so that the safety problem of a hydrophobic structure caused by using water as a heat conduction medium in the heat storage and release cycle process is simplified.

Description

Steam solid heat storage system
Technical Field
The invention belongs to the technical field of solid heat storage, and particularly relates to a steam solid heat storage system.
Background
Both thermal power plants and heat source plants produce steam by using heat energy generated by burning coal or natural gas by a boiler, and the steam is transmitted to a steam turbine set for power generation or directly transmitted to a heat user for use. Because the characteristic curve of the steam output by the boiler is inconsistent with the power generation load change of the steam turbine set or the demand curve of a heat user, the steam output with excessive output or insufficient output of the boiler can be caused. How to effectively solve the problems that the excess steam heat energy of the storage boiler is released and output in the steam use peak period, the output adjusting capability of the steam boiler is increased, and the steam heat energy utilization rate is improved.
Disclosure of Invention
In view of the problems, the invention provides a steam solid heat storage system which is arranged at the side of a thermal power plant and a heat source plant and is operated in parallel with a steam boiler to adjust the steam output quantity and the heat demand quantity of the steam boiler to be consistent.
The technical scheme adopted by the invention is as follows: a vapor solid thermal storage system comprising: solid heat accumulator, fin heat exchanger, congeal water pitcher, collection vapour jar, pressure regulating valve, circulation wind channel, drive fan group, the valve is a plurality of, its characterized in that: a driving fan set, a fin heat exchanger and a solid heat accumulator are sequentially arranged in a closed loop of the circulating air duct; an auxiliary air duct is also connected in parallel with the inlet and outlet circulating air ducts on the two sides of the solid heat accumulator, and an air adjusting door is also arranged on the auxiliary air duct; two ports of the fin heat exchanger are respectively connected with a water condensing tank and a steam collecting tank; the steam collecting tank is respectively connected with a steam input port and a saturated steam output port through valves; the outlet of the condensate tank is connected with the high-temperature condensate outlet through a valve and a pressure regulating valve in sequence; and the inlet of the condensate tank is connected with the pressure water inlet through a valve.
The invention comprises the following steps: the solid heat accumulator is a cubic structure built by heat accumulation bricks sintered by silicate heat-resistant materials or poured by silicate heat-resistant pouring materials, and the structure is also uniformly provided with air duct through holes which are distributed in an array and communicated with the circulating air duct.
The invention also includes: and a partition plate for establishing a circulating air channel is arranged on the inner side of the outer heat-insulating layer of the solid heat storage body.
The invention also includes: the finned heat exchanger is a pressure-resistant and high-temperature-resistant metal pipe component which is distributed in an array mode and takes air as a circulating heat-conducting medium, releases steam phase-change heat energy to the solid heat accumulator and absorbs saturated steam heat energy released by the solid heat accumulator.
The invention also includes: the water condensing tank and the steam collecting tank are cylindrical pressure containers made of heat-resistant metal.
The invention also includes: the driving fan set is composed of a plurality of variable frequency fans and is a device capable of controlling the flow direction and the flow rate of hot air in the circulating air duct.
The heat storage mechanism is as follows:
according to the steam solid heat storage system, in the heat storage and heat release circulation process of the system, air is used as a heat conduction cross-linking medium between the heat release end and the heat absorption end, so that the cost of the increased wall thickness of a heat exchange pipeline material is reduced by adding a hydrophobic structure for preventing low-temperature condensed water from generating water attack phenomenon in a heat exchange pipeline system and considering the safety problem caused by the rising of steam pressure of vaporized water in a high-temperature state when water is used as the heat conduction medium in the heat storage and heat release circulation process; the problem of upper limit of working temperature of 310 ℃ in general heat conduction oil when the heat conduction oil is used as a heat conduction medium in the heat storage and heat release circulation process is also solved, steam heat energy higher than 310 ℃ cannot be safely transmitted to the solid heat accumulator, and storage of high-temperature steam heat energy in a temperature range exceeding the upper limit of the temperature of the heat conduction oil to the solid heat accumulator is limited; the problem that the molten salt pump cannot work normally because the heat-conducting medium is solidified when the temperature of the heat-conducting medium is lower than the phase change point in the circulating process of heat storage and heat release of the molten salt is also solved. Has the characteristics of simple structure, convenient adjustment, wide solid material source and low cost.
Compared with the original steam solid heat storage device structure, the steam solid heat storage device has the following advantages and effects: the invention provides a steam solid heat storage system. The air duct through hole built by sintering bricks with silicate temperature-resistant materials or cast by pouring materials with silicate temperature-resistant materials replaces a heat exchange metal pipeline in a solid heat accumulator in the original steam heat accumulation equipment, and the heat exchange capacity of the solid heat accumulator can be improved. As shown in fig. 2, the solid heat accumulator built by the sintered bricks made of silicate temperature-resistant materials has a duct through hole built in the horizontal direction according to the modulus of the sintered bricks, the standard building red brick specification is 240 mm × 115 mm × 53 mm, and the cross-sectional area of the built duct through hole (the size of the duct through hole increased due to the thickness of the building mortar is not calculated) is as follows: compared with the structure of the original steam solid heat storage device, the metal pipeline with the same position generally has the diameter smaller than 28 mm, heat conducting media in the metal pipeline contact the solid heat storage body through the outer wall of the metal pipe to carry out heat exchange, the heat storage and release capacities of the solid heat storage body are related to the cross section of the metal pipe contact, and the cross section of the metal pipe with the thickness of 28 mm is 615 mm, so that the difference between the cross sections of the metal pipe and the metal pipe is 10 mm, and the heat storage and release effects of the air duct through hole are superior to those of the original technology. The system selects normal pressure air as a heat-conducting cross-linking medium in the circulating air duct, and the air is in a stable gaseous state within the temperature range of-45 ℃ to 650 ℃; compared with the prior steam solid heat storage device, the invention is simple and reliable by using water, fused salt or heat conducting oil as a heat conducting cross-linking medium. The auxiliary air duct and the air regulating door are arranged on the circulating air duct, the proportion of high-temperature circulating air flowing into the solid heat accumulator is controlled by the air regulating door during heat storage, the power of the fin heat exchanger outputting heat energy to the solid heat accumulator is changed, the temperature value of the high-temperature circulating air is changed, the temperature quality of the heat storage energy in the solid heat accumulator is improved, and the solid heat accumulator during heat release has the capacity of outputting high-temperature heat energy.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram showing an enlarged cross-sectional structure of the solid heat storage in FIG. 1.
Description of the main components in the figures: 1. the heat-accumulating type heat-accumulating solar water heater comprises a solid heat accumulator, 2 parts of a fin heat exchanger, 3 parts of a water condensing tank, 4 parts of a steam collecting tank, 5 parts of a pressure regulating valve, 6 parts of a high-temperature condensed water outlet, 7 parts of a circulating air channel, 8 parts of a driving fan set, 9 parts of a steam inlet, 10 parts of a pressure water inlet, 11 parts of a saturated steam outlet, 12 parts of a heat-accumulating steam valve, 12-1 parts of a heat-releasing steam valve, 12-2 parts of a condensed water valve, 12-3 parts of a water supplementing valve, 13 parts of an adjusting air door, 14 parts of an auxiliary air channel, 101 parts of a heat-insulating layer, 102 parts of an air zone partition plate, 103 parts of a heat-accumulating brick, 104 parts of an air channel through hole.
The drawing is merely a schematic illustration of one embodiment of the invention, from which other drawings can be derived by a person skilled in the art without inventive effort.
Detailed Description
The following detailed description of the embodiments of the present invention is provided for the purpose of illustration and explanation and is not to be construed as limiting the invention in any way.
Example 1
As shown in fig. 1-2, a solid heat accumulator 1, a fin heat exchanger 2, a condensate tank 3, a steam collection tank 4, a pressure regulating valve 5, a high-temperature condensate outlet 6, a circulating air duct 7, a driving fan unit 8, a steam inlet 9, a pressure water inlet 10, a saturated steam outlet 11, a heat storage steam valve 12, a heat release steam valve 12-1, a condensate water valve 12-2, a water replenishing valve 12-3, a regulating air door 13, an auxiliary air duct 14, a heat insulation layer 101, an air zone partition plate 102, a heat storage brick 103 and an air duct through hole 104; a driving fan set 8, a fin heat exchanger 2 and a solid heat accumulator 1 are sequentially arranged in a closed loop of the circulating air duct 7; an auxiliary air duct 14 is also connected in parallel to the inlet and outlet circulation air ducts on both sides of the solid heat accumulator 1, and an air damper 13 is also arranged on the auxiliary air duct; two ports of the fin heat exchanger 2 are respectively connected with a water condensing tank 3 and a steam collecting tank 4; the steam collecting tank 4 is connected with the steam input port 9 through the heat storage steam valve 12, and the steam collecting tank 4 is connected with the saturated steam output port 11 through the heat release steam valve 12-1; the condensate tank 3 is communicated with a condensate water valve 12-2 and then is connected with a high-temperature condensate water outlet 6 through a pressure regulating valve 5; the condensate tank 3 is connected with the pressure water inlet 10 through a water replenishing valve 12-3; the solid heat accumulator 1 is an integrated structure built by heat accumulation bricks 103 sintered by silicate temperature-resistant materials, and array distribution air duct through holes 104 communicated with the circulating air duct 7 are uniformly arranged in the structure; an air area partition plate 102 is further arranged on the inner side of the solid heat storage body external insulation layer 101. The fin heat exchanger 2 has the capacity of releasing steam phase change heat energy to the solid heat accumulator 1 and also has the capacity of converting the heat energy absorbed by the solid heat accumulator 1 into saturated steam and outputting the saturated steam; the water condensing tank 3 and the steam collecting tank 4 are cylindrical pressure vessels made of heat-resistant metal; the pressure regulating valve 5 is a device for controlling the pressure of condensed water, changes the output flow and the steam condensation temperature value of the steam condensed water by regulating the pressure of the condensed water, and improves the output power of the fin heat exchanger 2 for releasing the steam phase change heat energy to the solid heat accumulator 1; the driving fan set 8 is composed of a plurality of variable frequency fans and is a device capable of controlling the flow direction and flow rate of hot air in the circulating air duct 7; in the heat storage process, high-temperature heat exists in the fin heat exchanger 2 to serve as a heat release end, and the solid heat accumulator 1 serves as a heat absorption end; in the heat release process, high-temperature heat is stored in the solid heat accumulator 1 to serve as a heat release end, and the fin heat exchanger 2 serves as a heat absorption end. The high-temperature circulating air flowing out of the fin heat exchanger 2 is divided into two paths by controlling the ventilation state of the air adjusting door 13, one path of high-temperature circulating air flows through the air adjusting door 13 to be mixed with the low-temperature circulating air flowing out of the solid heat accumulator 1, the temperature of the low-temperature circulating air fed into the fin heat exchanger 2 is increased, and the purpose of raising the temperature of the high-temperature circulating air output by the fin heat exchanger 2 is achieved; the other path of high-temperature circulating air flows into the solid heat accumulator 1 to release heat. The distribution proportion of the two paths of high-temperature circulating air is adjusted, so that the power of the fin heat exchanger 2 outputting heat energy to the solid heat accumulator 1 and the temperature value of the high-temperature circulating air can be changed, and the heat energy stored in the solid heat accumulator 1 meets the heat release requirement.
The heat storage working process is as follows: opening a heat storage steam valve 12 and a condensation water valve 12-2, and closing a heat release steam valve 12-1 and a water supplementing valve 12-3, so that high-temperature steam enters the steam collection tank 4 through a steam inlet 9, and the steam filled in the steam collection tank 4 is sent to the fin heat exchanger 2; starting the driving fan set 8, blowing the low-temperature circulating air in the circulating air duct 7 to the fin heat exchanger 2, absorbing heat energy carried by steam in the fin heat exchanger 2, heating, and sending high-temperature circulating air formed by the fin heat exchanger 2 into an air duct through hole 104 of the solid heat accumulator 1 for heat release to raise the temperature of the solid heat accumulator 1; after the heat of the high-temperature steam in the fin heat exchanger 2 is released, condensed water formed in the fin heat exchanger 2 flows into a condensed water tank 3 and flows out of a high-temperature condensed water outlet 6 through a condensed water valve 12-2 and a pressure regulating valve 5; the high-temperature water flowing out of the high-temperature condensed water outlet 6 can be sent into the existing solid heat storage device for cooling, and the stored heat energy is used as a low-temperature heat release heat source; the opening degree of the air damper 13 is controlled to adjust the flow and the temperature of hot air in the circulating air duct 7 flowing into the solid heat accumulator 1, so that the heat storage capacity of the solid heat accumulator 1 and the heat storage effectiveness of the solid heat accumulator 1 are improved; and when the heat storage temperature of the solid heat storage body 1 reaches the required temperature, closing the heat storage steam valve 12, and ending the heat storage work.
The heat release working process comprises the following steps: closing the heat storage steam valve 12 and the condensate water valve 12-2, and opening the heat release steam valve 12-1 and the water supplementing valve 12-3, so that high-temperature water enters the condensate tank 3 through the pressure water inlet 10, and the high-temperature water filled in the condensate tank 3 is sent to the fin heat exchanger 2; starting a driving fan set 8, blowing low-temperature circulating air in a circulating air duct 7 into the solid heat accumulator 1, enabling the low-temperature circulating air to flow through an air duct through hole 104 to absorb heat energy of the solid heat accumulator 1 to form high-temperature air, enabling the high-temperature air to enter the fin heat exchanger 2, sending high-temperature steam generated by heat release of high-temperature water in the fin heat exchanger 2 into the steam collection tank 4, and outputting the steam in the steam collection tank 4 from a saturated steam output port 11 through a steam release valve 12-1; the saturated steam output from the saturated steam output port 11 can be sent to the existing solid heat storage superheated steam heater to prepare superheated steam for output; in the process, the air damper 13 is completely closed, so that no hot air flows in the auxiliary air duct 14, and all the hot air in the circulating air duct 7 is ensured to flow into the fin heat exchanger 2 from the solid heat accumulator 1; and when the temperature of the solid heat accumulator 1 is lower than the temperature required for generating saturated steam, closing the water replenishing valve 12-3, and finishing the heat release work.
Finally, it should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to modify and substitute the embodiments of the invention without departing from the spirit and scope of the embodiments of the invention.

Claims (5)

1. A vapor solid thermal storage system comprising: solid heat accumulator, fin heat exchanger, congeal water pitcher, collection vapour jar, pressure regulating valve, circulation wind channel, drive fan group, the valve is a plurality of, its characterized in that: a driving fan set, a fin heat exchanger and a solid heat accumulator are sequentially arranged in a closed loop of the circulating air duct; an auxiliary air duct is also connected in parallel with the inlet and outlet circulating air ducts on the two sides of the solid heat accumulator, and an air adjusting door is also arranged on the auxiliary air duct; two ports of the fin heat exchanger are respectively connected with a water condensing tank and a steam collecting tank; the steam collecting tank is respectively connected with a steam input port and a saturated steam output port through valves; the outlet of the condensate tank is connected with the high-temperature condensate outlet through a valve and a pressure regulating valve in sequence; and the inlet of the condensate tank is connected with the pressure water inlet through a valve.
2. The vapor solid thermal storage system of claim 1, wherein: the solid heat accumulator is a cubic structure built by heat accumulation bricks sintered by silicate heat-resistant materials or poured by silicate heat-resistant pouring materials, and the structure is also uniformly provided with air duct through holes which are distributed in an array and communicated with the circulating air duct.
3. The vapor solid thermal storage system of claim 2, wherein: and a partition plate for establishing a circulating air channel is arranged on the inner side of the outer heat-insulating layer of the solid heat storage body.
4. The vapor solid thermal storage system of claim 1, wherein: the finned heat exchanger is a pressure-resistant and high-temperature-resistant metal pipe component which is distributed in an array mode and takes air as a circulating heat-conducting medium, releases steam phase-change heat energy to the solid heat accumulator and absorbs saturated steam heat energy released by the solid heat accumulator.
5. The vapor solid thermal storage system of claim 1, wherein: the water condensing tank and the steam collecting tank are cylindrical pressure containers made of heat-resistant metal.
CN202210616817.6A 2022-04-05 2022-06-01 Steam solid heat storage system Pending CN114857975A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202210352241.7A CN114636339A (en) 2022-04-05 2022-04-05 Steam solid heat storage system
CN2022103522417 2022-04-05

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Publication Number Publication Date
CN114857975A true CN114857975A (en) 2022-08-05

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CN202210616817.6A Pending CN114857975A (en) 2022-04-05 2022-06-01 Steam solid heat storage system

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