CN116146960A

CN116146960A - Thermochemical heat accumulation energy storage system and energy storage method

Info

Publication number: CN116146960A
Application number: CN202211441190.1A
Authority: CN
Inventors: 万大阳; 吕凤; 沈中杰; 郭晓镭; 段乐章; 高永川; 许建良; 陆海峰; 韩利涛; 拓鹏杰; 梁钦锋; 赵辉; 刘爽; 邵松; 刘海峰; 王辅臣; 于广锁; 王亦飞; 陈雪莉
Original assignee: Luoyang Ruichang Environmental Engineering Co ltd
Current assignee: Luoyang Ruichang Environmental Engineering Co ltd
Priority date: 2021-11-23
Filing date: 2022-11-17
Publication date: 2023-05-23
Anticipated expiration: 2042-11-17
Also published as: CN116146960B; WO2024103646A1; CN219083857U

Abstract

The invention provides a thermochemical heat storage, energy storage and heat supply system and an energy storage and heat supply method, wherein the heat supply system comprises a first steam buffer tank and a thermochemical heat storage device, the thermochemical heat storage device comprises a decomposition reactor, a first storage bin, a synthesis reactor and a second storage bin which are communicated end to end in sequence, a calcium-based material capable of being circularly conveyed is arranged in the thermochemical heat storage device, the decomposition reactor is provided with an energy supply device, and a circulating pipe of the first steam buffer tank is communicated with the synthesis reactor; the inlet of the first steam buffer tank is communicated with the decomposition reactor through a first steam pipeline, and the inlet of the first steam buffer tank is communicated with the synthesis reactor through a second steam pipeline; the invention avoids the use of the conventional boiler, can carry out chemical heat storage, energy storage and heat supply in the valley electricity period, and can carry out heat supply only through chemical heat release in the peak electricity period, so that the peak electricity clipping and valley filling of electric energy can be effectively carried out, the carbon emission problem of the conventional heat supply system is avoided, and the invention is also beneficial to reducing the electricity cost.

Description

Thermochemical heat accumulation energy storage system and energy storage method

Technical Field

The invention relates to the technical field of chemical energy storage, in particular to a thermochemical heat storage, energy storage and heat supply system and an energy storage and heat supply method.

Background

At present, the national power supply is relatively tension, the most shortage of power supply in the peak power period is mainly caused, the supply in the valley power period is more abundant, the peak power load of the power grid is 50% -100% higher than the valley power load, and the peak power price is also higher than the valley power price. Therefore, energy storage technology is advocated in more industrial fields and civil fields, and the energy stored in the valley period is stored and utilized in the peak period so as to reduce the power supply pressure and the power consumption cost in the peak period.

For example, in the light industry, such as food processing enterprises, a certain amount of heat is often required to meet the production requirements during the production and manufacturing process. At present, more enterprises adopt conventional heating systems such as coal-fired boilers or electric heating boilers to supply heat, and the problems of environmental protection, difficult peak-to-valley electricity adjustment and the like often exist.

In the prior art, the heat storage technology is mainly divided into three modes of sensible heat storage, latent heat storage and chemical heat storage. The sensible heat storage heat density is low, the heat loss is serious, and the heat storage period is short; the phase change heat storage has the problems of two-phase separation, material leakage, corrosion and the like; compared with the former two technologies, the thermochemical energy storage has the remarkable advantages of high energy storage density, high reaction temperature, small long-term heat storage loss and the like, and can effectively solve the problems of conversion, storage, transmission and high-temperature regeneration of electric energy.

For this reason, in the environment where the current energy and power are relatively intense, there is a need for improvement of the conventional heating system in the industrial field, even the civil field.

Disclosure of Invention

In view of the above, the present invention aims to provide a thermochemical heat storage, energy storage and heat supply system and an energy storage and heat supply method, which improve the conventional heat supply system in the prior art, and peak shaving and valley filling are performed on electric energy through thermochemical heat storage and energy storage, so that the electric energy is optimally and effectively utilized, and the problems of high carbon emission, difficult peak-valley electricity regulation, high electricity consumption cost and the like of the conventional heat supply system are solved.

In order to achieve the above purpose, the technical scheme of the invention is realized as follows:

the thermochemical heat accumulation, energy storage and heat supply system comprises a first steam buffer tank and a thermochemical heat accumulation device, wherein the thermochemical heat accumulation device comprises a decomposition reactor, a first storage bin, a synthesis reactor and a second storage bin which are communicated end to end in sequence, a calcium-based material capable of being circularly conveyed is arranged in the thermochemical heat accumulation device, an energy supply device is arranged in the decomposition reactor, a circulating pipe of the first steam buffer tank is communicated with the synthesis reactor, and part of steam in the first steam buffer tank can be conveyed into the synthesis reactor; the inlet of the first steam buffer tank is communicated with the decomposition reactor through a first steam pipeline and is used for collecting superheated steam produced in the decomposition reactor; the inlet of the first steam buffer tank is communicated with the synthesis reactor through a second steam pipeline and is used for collecting superheated steam produced in the synthesis reactor or the steam produced by the synthesis reactor is emptied through the second steam pipeline.

Further, the heating system comprises a water supplementing unit, wherein the water supplementing unit comprises a water supplementing water source, a softening water tank, a heat exchanger and a water storage tank which are sequentially communicated, the softening water tank is provided with a first water pipe, the first water pipe is communicated with a low-temperature medium flow passage of the heat exchanger, and a first steam pipeline is communicated with a high-temperature medium flow passage of the heat exchanger.

Further, the synthesis reactor is provided with heat exchange equipment, an outlet of the water storage tank is communicated with an inlet of the heat exchange equipment, and an outlet of the heat exchange equipment is communicated with the first steam buffer tank.

Further, the outlet of the second steam pipeline or the heat exchange equipment is provided with a steam ejector, the outlets of the second steam pipeline and the heat exchange equipment are connected with the inlet of the steam ejector, and the outlet of the steam ejector is communicated with the first steam buffer tank.

Further, the heating system comprises a steam supplementing unit, the steam supplementing unit comprises a steam generator and a second steam buffer tank which are sequentially connected, an inlet of the steam generator is connected with the softening water tank through a second water pipe, a steam outlet of the steam generator is connected with an inlet of the second steam buffer tank, a heat supplementing pipe is arranged at an outlet of the second steam buffer tank, and the heat supplementing pipe is communicated with the first steam buffer tank.

Further, the outlet of the second steam buffer tank is provided with a reaction steam supply pipe, and the reaction steam supply pipe is communicated with the synthesis reactor.

Further, the discharge gate of first feed bin sets up first unloader, the discharge gate of second feed bin sets up second unloader, first unloader and synthesis reactor intercommunication, second unloader and decomposition reactor intercommunication.

Further, a first material carrying steam pipe is arranged at the outlet of the second steam buffer tank, a first blanking pipe is arranged at the outlet of the first blanking device, a first feeding pipeline is arranged in the synthesis reactor, first throttling equipment is arranged on the first material carrying steam pipe or the first blanking pipe, the first material carrying steam pipe and the first blanking pipe are respectively connected with the inlet of the first throttling equipment, and the outlet of the first throttling equipment is connected with the first feeding pipeline; the outlet of the second steam buffer tank is provided with a second material carrying steam pipe, the outlet of the second discharging device is provided with a second discharging pipe, the decomposition reactor is provided with a second feeding pipeline, the second material carrying steam pipe or the second discharging pipe is provided with a second throttling device, the second material carrying steam pipe and the second discharging pipe are respectively connected with an inlet of the second throttling device, and an outlet of the second throttling device is connected with the second feeding pipeline.

Further, a first discharging pipeline is arranged at a discharging hole of the decomposition reactor, the first discharging pipeline is connected with a feeding hole of a first gas-solid separation device, a steam outlet of the first gas-solid separation device is connected with a first steam pipeline, and a calcium-based material outlet of the first gas-solid separation device is connected with an inlet of a first stock bin; the discharge port of the synthesis reactor is provided with a second discharge pipeline, the second discharge pipeline is connected with the feed inlet of the second gas-solid separation device, the steam outlet of the second gas-solid separation device is connected with the second steam pipeline, and the calcium-based material outlet of the second gas-solid separation device is connected with the inlet of the second feed bin.

The heat supply method comprises an energy storage and heat supply process and an energy release and heat supply process; the energy storage and heat supply process is characterized in that calcium hydroxide stored in the second storage bin is conveyed into the decomposition reactor, the energy supply device is used for heating and decomposing the calcium hydroxide, the generated calcium oxide is conveyed into the first storage bin for storage, and the generated superheated steam is conveyed into the first steam buffer tank for supplying steam to the steam utilization system; the energy-releasing and heat-supplying process is characterized in that calcium oxide stored in the first storage bin is conveyed to the synthesis reactor, steam is conveyed into the synthesis reactor, the calcium oxide in the synthesis reactor reacts with water to release heat, the heat is conveyed to the first steam buffer tank in the form of superheated steam and is used for supplying steam to the steam utilization system, and the generated calcium hydroxide is conveyed to the second storage bin for storage.

Compared with the prior art, the thermochemical heat accumulation energy storage heat supply system and the energy storage heat supply method have the following advantages:

according to the thermochemical heat storage, energy storage and heat supply system and the energy storage and heat supply method, the thermochemical heat storage device is arranged, so that the use of a conventional boiler is avoided, chemical heat storage, energy storage and heat supply can be performed in a valley electricity period, heat supply can be performed by chemical heat release only through the chemical heat storage, peak shaving and valley filling of electric energy can be effectively performed in a peak electricity period, the carbon emission problem of the conventional heat supply system is avoided, and the electricity consumption cost is reduced. Meanwhile, the superheated steam can be generated no matter in a chemical heat storage and energy storage process or a chemical heat release process, and the superheated steam is collected through the first steam buffer tank and can be supplied to an external steam utilization system for use.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:

FIG. 1 is a schematic diagram of a thermal chemical heat storage, energy storage and heat supply system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the structure among a gas-solid separation device, a silo and a blanking device in a thermochemical heat accumulation energy storage and heat supply system according to the embodiment of the invention;

FIG. 3 is a schematic diagram of a blanking form of a silo in a thermochemical thermal storage energy storage heating system in accordance with an embodiment of the invention;

FIG. 4 is a schematic diagram of another blanking form of a silo in a thermochemical thermal storage energy storage heating system in accordance with an embodiment of the invention.

Reference numerals illustrate:

1. a decomposition reactor; 2. an energy supply device; 3. a first discharge line; 4. a first gas-solid separation device; 5. a first steam line; 6. a first bin; 7. a first blanking device; 8. a first blanking pipe; 9. a first steam buffer tank; 91. a steam supply pipeline; 92. a steam utilization system; 93. a circulation pipe; 10. a first feed line; 11. a synthesis reactor; 12. a second discharge line; 13. a second gas-solid separation device; 14. a second steam line; 15. a second bin; 16. a second blanking device; 17. a second blanking pipe; 18. a second feed line; 19. a water supply source; 20. a first water pump; 21. a soft water tank; 22. a first water pipe; 23. a heat exchanger; 24. a heat compensator; 25. a water storage tank; 26. a second water pump; 27. a heat exchange device; 28. a steam ejector; 29. a second water pipe; 30. a third water pump; 31. a steam generator; 32. a second steam buffer tank; 33. a heat supplementing pipe; 34. a reaction steam supply pipe; 35. the first material carrying steam pipe; 36. a first throttle device; 37. a second material carrying steam pipe; 38. a second throttling device; 39. a first stage separator; 40. a first collecting pipe; 42. a second stage separator; 43. a second collecting pipe; 44. weightlessness weighing; 45. a screw blanking device; 46. a tank support lug; 47. a weighing module; 48. a controller; 49. a signal line; 50. and (5) feeding back a regulating valve.

Detailed Description

The inventive concepts of the present disclosure will be described below using terms commonly used by those skilled in the art to convey the substance of their work to others skilled in the art. These inventive concepts may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. Arrows in the drawings of the present application indicate the flow direction of the relevant material. According to the conventional arrangement sequence of English letters, A-T in the drawing refer to corresponding valves, and in view of the fact that valve arrangement of pipelines is relatively common, the application does not need to carry out text description on the arrangement of each valve, so that the scheme is convenient to introduce and understand in combination with the drawing.

Due to certain structural similarity, the specific arrangement in fig. 2 may be the specific structural arrangement of the first gas-solid separation device 4, the first bin 6, the first blanking device 7 and related specific structural arrangements of the second gas-solid separation device 13, the second bin 15, the second blanking device 16 and related specific structural arrangements, and corresponding reference numerals are also distinguished in brackets for easy understanding.

The invention will be described in detail below with reference to the drawings in connection with embodiments.

Example 1

This embodiment proposes a thermochemical heat accumulation energy storage heating system, as shown in fig. 1-4, heating system includes first steam buffer tank 9 and thermochemical heat accumulation device, thermochemical heat accumulation device includes decomposition reactor 1, first feed bin 6, synthetic reactor 11, the second feed bin 15 that the head and the tail communicate in proper order, set up the calcium-based material that can be circulated and carried in the thermochemical heat accumulation device, the calcium-based material includes calcium hydroxide granule, calcium oxide granule, decomposition reactor 1 sets up energy supply device 2 for calcium hydroxide decomposition generates calcium oxide, superheated steam, first feed bin 6 is arranged in storing the calcium oxide of generating in the decomposition reactor 1, thereby realizes chemical heat accumulation energy storage process.

The circulating pipe 93 of the first steam buffer tank 9 is communicated with the synthesis reactor 11, and can convey a part of steam in the first steam buffer tank 9 into the synthesis reactor 11, so that calcium oxide reacts with the steam to generate calcium hydroxide, and the heat released by the reaction heats excessive steam to generate superheated steam, so that chemical energy is released in a heat energy mode, and a chemical heat release process is realized; the second silo 15 is used for storing the calcium hydroxide produced in the synthesis reactor 11. The inlet of the first steam buffer tank 9 is communicated with the decomposition reactor 1 through a first steam pipeline 5 and is communicated with the synthesis reactor 11 through a second steam pipeline 14, and is used for collecting the superheated steam produced in the decomposition reactor 1 and the synthesis reactor 11. The first steam buffer tank 9 is provided with a steam supply pipeline 91, and the first steam buffer tank 9 is connected with an external steam utilization system 92 through the steam supply pipeline 91. In addition, for the synthesis reactor 11, considering that the moisture in the synthesis reactor 11 mainly participates in the reaction, and the amount of steam that can be provided to the outside is limited, the synthesis reactor 11 may not be connected to the first steam buffer tank 9, and the air outlet of the synthesis reactor 11 may be provided with a second steam pipeline 14, and the second steam pipeline 14 may be evacuated, that is, the steam produced by the synthesis reactor 11 may be evacuated through the second steam pipeline 14.

Alternatively, the second steam pipeline 14 is kept in communication with the synthesis reactor 11 and the first steam buffer tank 9, and an additional evacuation branch pipe is provided in the second steam pipeline 14 to perform appropriate evacuation according to actual production requirements.

The energy supply device 2 is an electric heater and/or a high-temperature waste heat pipeline (for example, industrial high-temperature waste gas with the temperature of about 610 ℃), so that the industrial waste heat can be fully utilized, the utilization rate of waste heat resources is improved, and the waste of heat energy is avoided. In addition, the energy supply device 2 is preferably an electric heater, which can fully play the role of peak clipping and valley filling of electric energy, and the decomposition reactor 1 is utilized to perform a chemical heat storage and energy storage process of converting the electric energy into chemical energy in a valley period, and the synthesis reactor 11 is utilized to perform a chemical heat release process in a peak period, so that the chemical energy is released in a heat energy manner, and the electric energy is optimally and effectively utilized. The steam utilization system 92 may be a production system using steam materials to participate in production, reaction and the like, or may be a heat exchange system utilizing heat carried by steam to take heat and utilize the heat; of course, if the steam system 92 is used to control the pressure and temperature of the superheated steam, the system can meet the requirement of civil heating, and can also be integrated into a conventional civil heating pipe network.

Thereby the heating system of this application through setting up thermochemical heat accumulation device, has avoided conventional boiler's use, can make full use of millet electricity period carry out chemical heat accumulation energy storage and heat supply, only carry out chemical heat release through chemical heat accumulation energy storage and carry out heat supply in peak electricity period, can carry out the peak clipping of electric energy effectively and fill out the millet, has stopped conventional heating system's carbon emission problem, also is favorable to reducing the electricity cost. Meanwhile, the superheated steam can be generated in the chemical heat storage and energy storage process or the chemical heat release process, and the superheated steam is collected through the first steam buffer tank 9 and can be supplied to the external steam utilization system 92 for use. Further, by providing the circulation pipe 93, the first vapor buffer tank 9 is enabled to supply the reactant (water or water vapor) to the synthesis reactor 11, and the aqueous medium can be heated by utilizing the exothermic heat of the synthesis reaction, generating superheated vapor for external use.

The heating system comprises a water supplementing unit, the water supplementing unit comprises a water supplementing water source 19, a softening water tank 21, a heat exchanger 23 and a water storage tank 25 which are sequentially communicated, the water supplementing water source 19 can be a conventional industrial water supply water source, the water supplementing water source 19 supplies water into the softening water tank 21 through a first water pump 20, the softening water tank 21 is used for softening water, the softening water tank 21 is provided with a first water pipe 22, the first water pipe 22 is communicated with a low-temperature medium flow passage of the heat exchanger 23, the first steam pipeline 5 is communicated with a high-temperature medium flow passage of the heat exchanger 23, in the heat exchanger 23, softened water exchanges heat with superheated steam produced in the decomposition reactor 1, preferably, after heat exchange, the superheated steam produced in the decomposition reactor 1 is cooled to 180 ℃, the superheated steam after heat exchange is conveyed into the first steam buffer tank 9, and the softened water after heat exchange is conveyed into the water storage tank 25 for standby. So that a portion of the electrical energy can be converted into heat energy of the softened water for storage during the valley phase for use during the peak phase.

Preferably, the water storage tank 25 is provided with a heat compensator 24 at its inlet, so that softened water after heat exchange by the heat exchanger 23 may be further heated by the heat compensator 24 if the temperature of the softened water does not reach a certain temperature, so that water entering the water storage tank 25 has a sufficiently high temperature.

In addition, the synthesis reactor 11 is provided with a heat exchange device 27 for exchanging heat generated in the synthesis reactor 11, and the heat exchange device 27 may be disposed inside the synthesis reactor 11 or may be disposed outside the synthesis reactor 11; for example, by providing a corresponding coil structure as a heat exchange member of the heat exchange apparatus 27, the coil structure may be located inside the synthesis reactor 11 or may be bonded to the outer wall of the synthesis reactor 11, and heat exchange may be achieved. The outlet of the water storage tank 25 is communicated with the inlet of the heat exchange device 27, and the outlet of the heat exchange device 27 is communicated with the first steam buffer tank 9, so that under the condition that a large amount of heat can be released in unit time in the synthesis reactor 11 in the peak electricity period, the spare water in the water storage tank 25 is subjected to timely heat exchange, superheated water or superheated steam is formed in a pipeline and then is conveyed into the first steam buffer tank 9, a large amount of heat in the synthesis reactor 11 can be timely and effectively taken away, the situation that a large amount of heat is difficult to timely and quickly take away by water substances conveyed into the synthesis reactor 11 only by virtue of the circulation pipe 93 is avoided, the situation that the temperature in the synthesis reactor 11 is too high is avoided, and the potential safety hazard is reduced. For the output of the spare water in the water storage tank 25, a second water pump 26 may be disposed in the outlet pipeline of the water storage tank 25, and the water in the water storage tank 25 is forced to flow into the heat exchange device 27 by the water pump, so as to timely take away the heat generated in the synthesis reactor 11.

Preferably, the outlet of the second steam pipeline 14 or the heat exchange device 27 is provided with a steam ejector 28, the outlets of the second steam pipeline 14 and the heat exchange device 27 are connected with the inlet of the steam ejector 28, and the outlet of the steam ejector 28 is communicated with the first steam buffer tank 9, so that by arranging the steam ejector 28, the superheated steam (directly generated and produced in the synthesis reactor 11) output by the second steam pipeline 14 and the superheated water and superheated steam after heat exchange of the softened water output by the water storage tank 25 can be mixed by the steam ejector 28, and then the water substances with different temperatures can be conveyed into the first steam buffer tank 9, thereby being beneficial to keeping the internal temperature distribution of the first steam buffer tank 9 and avoiding the superheated steam with overhigh temperature from impacting the first steam buffer tank 9.

The heating system is except moisturizing unit, still includes moisturizing unit, moisturizing unit can have solitary water supply unit, in this application, the water resource source in the moisturizing unit can be used with moisturizing unit, specifically, moisturizing unit includes steam generator 31, second steam buffer tank 32 that connect gradually, steam generator 31's entry is connected with softened water pitcher 21 through second water pipe 29, second water pipe 29 sets up third water pump 30 for in will softening water pitcher 21 soft water pump to steam generator 31, steam generator 31's steam outlet and the entry linkage of second steam buffer tank 32 to when needs extra steam, can produce steam through using the soft water in the softened water pitcher 21 to heat it, then carry to second steam buffer tank 32 in reserve, also realized moisturizing unit, moisturizing unit between sharing one set of water supply assembly simultaneously, be favorable to reducing the complexity of water supply, whole system. Wherein the steam generator 31 is preferably an electrically heated steam generator capable of providing water steam at about 200 c into the second steam buffer tank 32.

The outlet of the second vapor buffer tank 32 is provided with a reaction vapor supply pipe 34, the reaction vapor supply pipe 34 is communicated with the synthesis reactor 11, and when the first vapor buffer tank 9 conveys insufficient circulating vapor to the synthesis reactor 11 through a circulating pipe 93, or when the synthesis reactor 11 is just started to operate, or when large fluctuation exists in the first vapor buffer tank 9, and other unconventional conditions, the reaction vapor can be supplied to the synthesis reactor 11 through the standby vapor in the second vapor buffer tank 32. Preferably, the reaction steam supply pipe 34 is connected with the circulation pipe 93, so that a part of pipe sections can be shared by the reaction steam supply pipe 34 and the circulation pipe 93, and accordingly, a valve Q is disposed at one end of the reaction steam supply pipe 34 close to the second steam buffer tank 32, and a valve R is disposed at one end of the circulation pipe 93 close to the first steam buffer tank 9, so that on-off, opening degree and the like of the reaction steam supply pipe 34 and the circulation pipe 93 can be respectively regulated and controlled through corresponding valves.

In addition, the outlet of the second steam buffer tank 32 is provided with a heat supplementing pipe 33, and the heat supplementing pipe 33 is communicated with the first steam buffer tank 9, so that when attenuation or fluctuation occurs in the first steam buffer tank 9 or steam in the first steam buffer tank 9 does not meet the condition of supplying steam to the outside only, the second steam buffer tank 32 can supplement steam in the first steam buffer tank 9, so that the heating system can provide superheated steam to the outside more stably and continuously.

For the discharging of the calcium-based materials in the corresponding storage bins, the discharging holes of the first storage bin 6 and the second storage bin 15 are respectively provided with a discharging device, and the discharging devices are respectively marked as a first discharging device 7 and a second discharging device 16. The first discharging device 7 is communicated with the synthesis reactor 11 and is used for conveying calcium oxide particles in the first storage bin 6 into the synthesis reactor 11, and the second discharging device 16 is communicated with the decomposition reactor 1 and is used for conveying calcium hydroxide particles in the second storage bin 15 into the decomposition reactor 1.

As shown in fig. 2, the discharging device comprises a weightless scale 44 and a screw discharging device 45 which are sequentially connected, a feeding hole of the weightless scale 44 is communicated with a discharging hole of the first storage bin 6 or the second storage bin 15, a discharging hole of the weightless scale 44 is connected with a feeding hole of the screw discharging device 45, a discharging pipe is arranged at a discharging hole of the screw discharging device 45, and the discharging pipe is communicated with the synthesis reactor 11 or the decomposition reactor 1. The structures of the first blanking device 7 and the second blanking device 16 are similar, the structures of the blanking devices can be adopted, and the specific material bins and reactors are connected according to actual conditions, so that the detailed description is omitted. Therefore, through the weightless scale 44, a specific amount of calcium-based materials are provided outwards according to actual needs, and then the transportation of the calcium-based materials can be realized under the drive of the screw feeder 45.

The present application is not limited to the discharging form of the weightless scale 44 and the screw discharger 45, but the present application proposes another discharging form.

As shown in fig. 3, the discharging device comprises a screw discharger 45, a feeding hole of the screw discharger 45 is communicated with a discharging hole of the first bin 6 or the second bin 15, a discharging pipe is arranged at the discharging hole of the screw discharger 45, and the discharging pipe is communicated with the synthesis reactor 11 or the decomposition reactor 1. Wherein, referring to the form of fig. 2, the bin may also be integrated with the weightless scale to form a bin with weighing components, such as the bin form of fig. 3. During blanking, the material mass flow is measured through a weightlessness scale, and meanwhile, the screw rotation speed of the screw blanking device 45 is controlled to adjust the blanking amount.

As shown in fig. 4, the present application may not separately provide a blanking device, but feedback-adjust a corresponding blanking valve for the weight variation of the whole bin. Specifically, the tank support lugs 6 of the first storage bin 6 and the tank support lugs 6 of the second storage bin 15 are provided with weighing modules 47, the weighing modules 47 can detect the whole weight of the storage bin (containing materials) in real time, the feed openings of the first storage bin 6 and the second storage bin 15 are provided with feedback regulating valves 50, the weighing modules 47 and the feedback regulating valves 50 are connected with a controller 48 through signal lines 49, in the feeding process, the weighing modules 47 send detected weight values to the controller 48, the controller 48 determines the feeding condition according to the weight value reduction or the weight value reduction in unit time, and adjusts the opening of the feedback regulating valves 50, for example, according to the actual material requirement conditions, the opening of the feedback regulating valves 50 is adjusted to be larger, smaller or opened or closed.

For easy understanding, the solution form in fig. 4 can be regarded as omitting the first blanking device 7 and the second blanking device 16 on the basis of fig. 1, and adaptively simplifying the corresponding pipelines, so that the first silo 6 is connected with the first blanking pipe 8 through the valve C, the second silo 15 is connected with the second blanking pipe 17 through the valve H, and accordingly, the feedback control valve 50 in fig. 4 corresponds to the illustration of the valve C, H in fig. 1. At this time, functionally divided, the combination of the weighing module 47, the controller 48, and the feedback control valve 50 may be regarded as a "blanking component" capable of providing an accurate blanking control function.

For conveying the calcium oxide particles, a first material carrying steam pipe 35 is arranged at the outlet of the second steam buffer tank 32, a first discharging pipe 8 is arranged at the outlet of the first discharging device 7, a first feeding pipeline 10 is arranged in the synthesis reactor 11, a first throttling device 36 is arranged at the first material carrying steam pipe 35 or the first discharging pipe 8, the first material carrying steam pipe 35 and the first discharging pipe 8 are respectively connected with the inlet of the first throttling device 36, and the outlet of the first throttling device 36 is connected with the first feeding pipeline 10; the first throttling device 36 is preferably a venturi tube, and as for the structure of the venturi tube, the prior art can be directly adopted, and preferably, the first carrier gas tube 35 is connected with an end inlet of the first throttling device 36, and the first discharging tube 8 is connected with a negative pressure inlet of the first throttling device 36.

Correspondingly, for conveying calcium hydroxide particles, a second carrying steam pipe 37 is arranged at the outlet of the second steam buffer tank 32, a second discharging pipe 17 is arranged at the outlet of the second discharging device 16, a second feeding pipeline 18 is arranged in the decomposition reactor 1, a second throttling device 38 is arranged at the second carrying steam pipe 37 or the second discharging pipe 17, the second carrying steam pipe 37 and the second discharging pipe 17 are respectively connected with the inlet of the second throttling device 38, and the outlet of the second throttling device 38 is connected with the second feeding pipeline 18; preferably, the second throttling device 38 is a venturi tube, the second carrier gas pipe 37 is connected with an end inlet of the second throttling device 38, and the second discharging pipe 17 is connected with a negative pressure inlet of the second throttling device 38.

The second steam buffer tank 32 is provided with a corresponding steam carrying pipe and a corresponding venturi pipe, so that after the calcium-based material is conveyed out of the storage bin, the calcium-based material can be driven by steam airflow to be simply and conveniently conveyed into a corresponding reactor. In particular, after the steam flow drives the calcium oxide to the synthesis reactor 11, the steam as the carrier gas can also continue to react with the synthesis reactor 11, so that the carrier gas can be fully utilized.

For the discharging of the calcium-based material in the reactor, as the calcium-based material is mainly driven to be conveyed by taking steam as carrier gas in the application, the discharging port of the decomposition reactor 1 and the discharging port of the synthesis reactor 11 are respectively provided with a gas-solid separation device, which is respectively marked as a first gas-solid separation device 4 and a second gas-solid separation device 13.

Specifically, the discharge port of the decomposition reactor 1 is provided with a first discharge pipeline 3, the first discharge pipeline 3 is connected with the feed inlet of the first gas-solid separation device 4, the steam outlet of the first gas-solid separation device 4 is connected with a first steam pipeline 5, and the calcium-based material outlet of the first gas-solid separation device 4 is connected with the inlet of the first storage bin 6. Preferably, the calcium-based material outlet of the first gas-solid separation device 4 is located right above the inlet of the first storage bin 6, so that the separated calcium-based material can automatically fall into the first storage bin 6 under the action of self gravity.

Correspondingly, a second discharging pipeline 12 is arranged at a discharging port of the synthesis reactor 11, the second discharging pipeline 12 is connected with a feeding port of a second gas-solid separation device 13, a steam outlet of the second gas-solid separation device 13 is connected with a second steam pipeline 14, and a calcium-based material outlet of the second gas-solid separation device 13 is connected with an inlet of a second storage bin 15. Preferably, the calcium-based material outlet of the second gas-solid separation device 13 is located directly above the inlet of the second silo 15.

For the gas-solid separation device, the gas-solid separation device comprises a first-stage separator 39 and a second-stage separator 42, wherein a feed inlet of the first-stage separator 39 is connected with the first discharge pipeline 3 or the second discharge pipeline 12, a steam outlet of the first-stage separator 39 is connected with a feed inlet of the second-stage separator 42, a first collecting pipe 40 is arranged at a calcium-based material outlet of the first-stage separator 39, a steam outlet of the second-stage separator 42 is connected with the first steam pipeline 5 or the second steam pipeline 14, a second collecting pipe 43 is arranged at a calcium-based material outlet of the second-stage separator 42, and the first collecting pipe 40 and the second collecting pipe 43 are communicated with the first storage bin 6 or the second storage bin 15. Preferably, the first collecting pipe 40 and the second collecting pipe 43 may share a pipe structure at a side close to the storage bin, or the first collecting pipe 40 is connected to the storage bin, and an outlet of the second collecting pipe 43 is connected to the first collecting pipe 40; or the second collecting pipe 43 is connected with the stock bin, and the outlet of the first collecting pipe 40 is connected with the second collecting pipe 43.

The gas-solid separator of the present application is not limited to the form of the first stage separator 39 and the second stage separator 42, and may be formed by connecting a plurality of dust collectors in series, and the dust collectors may be cyclone separators, cloth bag separators, wire mesh dust collectors, wet electric dust collectors, molecular sieve adsorption dust collectors, or the like. In view of the specific dust removing device and dust removing principle, reference may be made to the prior art, and details are not described here.

Therefore, the two-stage separator is arranged, the calcium-based material and the steam can be separated relatively efficiently, the calcium-based material is prevented from entering the steam pipeline, the first steam buffer tank 9 and even the steam supply pipe network along with the steam, the loss of the calcium-based material is prevented, the cleaning of the steam related pipeline and the equipment is ensured, and the pipeline and the equipment are prevented from being blocked. Preferably, the first stage separator 39 is a cyclone separator and the second stage separator 42 is a metal bag filter.

Example 2

The embodiment provides a thermochemical heat accumulation energy storage heat supply method based on embodiment 1, which comprises an energy storage heat supply process and an energy release heat supply process, wherein the energy storage heat supply process is preferably performed in a valley period, but is not limited to the valley period, and in some cases, the energy storage heat supply process can also be performed in a flat period or a peak period. The energy release and heat supply process can be performed according to the actual conditions of the system running condition, the external heat supply demand, the peak-valley period of the electric power and the like, for example, the peak-power period.

The energy-storing and heat-supplying process conveys the calcium hydroxide stored in the second storage bin 15 into the decomposition reactor 1, the energy-supplying device 2 heats and decomposes the calcium hydroxide, the generated calcium oxide is conveyed into the first storage bin 6 for storage, and the generated superheated steam is conveyed into the first steam buffer tank 9 for supplying steam to the steam utilization system 92.

The energy and heat release process conveys the calcium oxide stored in the first storage bin 6 to the synthesis reactor 11, and conveys steam into the synthesis reactor 11, the calcium oxide in the synthesis reactor 11 reacts with water to release heat, and the heat is conveyed to the first steam buffer tank 9 in the form of superheated steam for supplying steam to the steam utilization system 92, and the generated calcium hydroxide is conveyed to the second storage bin 15 for storage.

The thermochemical heat accumulation energy storage heat supply system comprises a central processing unit and at least is used for regulating and controlling the operation of related equipment, the opening of a valve and the like in the energy storage heat supply process and the energy release heat supply process; the first steam buffer tank 9 is internally provided with a first pressure detector, the second steam buffer tank 32 is internally provided with a second pressure detector, and the first pressure detector and the second pressure detector are both connected with a central processing unit and are used for acquiring the steam pressure in the first steam buffer tank 9 and the second steam buffer tank 32 in real time. The first pressure detector and the second pressure detector are superheated steam pressure meters, and can be purchased from the market, and the description is omitted.

The energy storage and heat supply process comprises the following steps:

s1, supplying water into a softening water tank 21 through a water supplementing water source 19, and softening the water;

The operation of softening water and related technologies can directly adopt the prior art, and are not described in detail. For the transportation of the water body, the first water pump 20 and the valve J are opened, so that water can be supplied into the softened water tank 21 through the water replenishing water source 19.

S2, conveying softened water in the softened water tank 21 to the steam generator 31 to generate superheated steam, and conveying the superheated steam into the second steam buffer tank 32;

wherein the steam generator 31 is capable of providing superheated steam at about 200 ℃ and 0.5MPa, and accordingly, softened water can be supplied to the steam generator 31 by opening the valve N and the third water pump 30; opening valve O allows the produced superheated steam to enter the second steam buffer tank 32.

S3, detecting the pressure P2 in the second steam buffer tank 32 in real time through a second pressure detector;

s4, judging whether P2 is more than or equal to a first preset pressure; if yes, go to step S5; if not, returning to the step S2;

the first preset pressure can be regarded as the starting pressure condition of the decomposition reactor 1 and also as the loading steam pressure condition of the calcium hydroxide particles. Preferably, the first preset pressure is 0.4MPa. The central processing unit acquires P2 in real time and judges according to the step S4, so that the automatic and intelligent regulation and control of the starting of the decomposition reactor 1 and accurate regulation are realized.

S5, opening a second material carrying steam pipe 37 and a second discharging device 16, and conveying the calcium hydroxide in the second storage bin 15 into the decomposition reactor 1 through material carrying steam;

accordingly, the valve H, T needs to be opened so that the charge steam, calcium hydroxide can enter the decomposition reactor 1 through the second feed line 18.

S6, starting the energy supply device 2 to decompose the calcium hydroxide in the decomposition reactor 1 into calcium oxide and superheated steam;

wherein the energy supply device 2 can provide a high temperature of about 610 ℃, and the superheated steam produced by the decomposition reaction is about 610 ℃ and 0.3MPaG.

S7, carrying out gas-solid separation on steam and solid particles sent out from a discharge port of the decomposition reactor 1 through a first gas-solid separation device 4;

wherein, the valve A is opened, the decomposition reactor 1 is discharged, and the first-stage gas-solid separation is carried out on the discharged material of the decomposition reactor 1 through a first-stage separator 39 (cyclone separator); then, the separated gaseous material is subjected to a second-stage gas-solid separation by a second-stage separator 42 (metal filter bag filter) so that the dust content of the superheated steam after the two-stage gas-solid separation<5mg/m ³ Valve B is opened so that the separated solid particles (most of the calcium oxide and a small part of the calcium hydroxide) fall into the first silo 6.

S8, the superheated steam after gas-solid separation and softened water in the softened water tank 21 exchange heat through the heat exchanger 23, and the superheated steam after heat exchange enters the first steam buffer tank 9.

Wherein, the valve K is opened, so that softened water can be conveyed to the heat exchanger 23 through the first water pipe 22, exchanges heat with the superheated steam with the temperature of 610 ℃, and the superheated steam after heat exchange is cooled to about 180 ℃ and enters the first steam buffer tank 9 for providing steam for the steam using system 92; meanwhile, for the softened water at normal temperature, the temperature can be raised to 83 ℃ approximately after heat exchange, then the softened water can be further heated by the heat compensator 24 to be raised to 144 ℃ (near saturation), and then the softened water is conveyed to the water storage tank 25 for storage for energy release and heat supply processes.

Furthermore, in consideration of the smoothness of the outward supply of the steam from the first steam buffer tank 9, the energy storage and heat supply process further includes:

s9, detecting the pressure P1 in the first steam buffer tank 9 in real time through a first pressure detector;

s10, judging whether P1 is smaller than a second preset pressure; if yes, go to step S11; if not, opening a steam supply pipeline 91 to supply steam to a steam utilization system 92;

wherein the second preset pressure may be considered as satisfying a lower pressure limit for providing steam to the outside. Preferably, the second preset pressure is 0.3MPa. The central processing unit acquires P1 in real time and judges according to the step S10, so that automatic and intelligent regulation and control and accurate regulation are facilitated in the process of providing steam to the outside of the first steam buffer tank 9.

S11, starting the heat supplementing pipe 33, supplementing the steam in the first steam buffer tank 9 by using the superheated steam in the second steam buffer tank 32, and returning to the step S3.

Wherein, because the pressure and the temperature in the second steam buffer tank 32 are relatively high, when the pressure in the first steam buffer tank 9 is insufficient or the external use steam amount is large, the steam in the first steam buffer tank 9 can be timely and efficiently supplemented through the second steam buffer tank 32, which is beneficial to maintaining the stability of the outward supply of the steam by the first steam buffer tank 9; meanwhile, no matter fluctuation is generated in the energy storage and heat supply process or the condition of sudden increase of the external steam demand, the heat supply system can be ensured to stably and continuously supply steam to the outside, and the operation elasticity of the heat supply system is improved.

The steps S9 to S11 may be performed after the step S8 of the energy storage and heating process, or may be performed in real time during the whole energy storage and heating process, so as to ensure that the first steam buffer tank 9 can smoothly supply steam to the outside.

The energy release and heat supply process comprises the following steps:

b1, supplying water into a softening water tank 21 through a water supplementing source 19, and softening the water;

b2, conveying softened water in the softened water tank 21 to the steam generator 31 to generate superheated steam, and conveying the superheated steam into the second steam buffer tank 32;

B3, detecting the pressure P2 in the second steam buffer tank 32 in real time through a second pressure detector;

b4, judging whether P2 is more than or equal to a first preset pressure; if yes, carrying out a step B5; if not, returning to the step B2;

the specific operations of steps B1-B4 are the same as those of steps S1-S4, and will not be repeated. Whether it is an energy storage and heat supply process or an energy release and heat supply process, the four steps belong to related operations when the reactor is started up, so as to ensure that the second steam buffer tank 32 has certain pressure, and the production requirements of solid material transportation, steam supply possibly needed by the first steam buffer tank 9 at any time and the like are prepared in advance, so that the stable starting and stable running of the energy storage and heat supply process and the energy release and heat supply process are ensured.

B5, opening a first material carrying steam pipe 35 and a first blanking device 7, and conveying the calcium oxide in the first storage bin 6 into the synthesis reactor 11 through material carrying steam; at the same time, the reaction steam supply pipe 34 and/or the circulation pipe 93 are opened, and sufficient steam is supplied into the synthesis reactor 11 through the second steam buffer tank 32 and/or the first steam buffer tank 9 as a reactant to maintain the progress of the synthesis reaction;

accordingly, valve C, S needs to be opened to allow the charge vapors, calcium oxide, to enter the synthesis reactor 11 via the first feed line 10. Meanwhile, if the whole set of heating system is in the start-up stage and has not been operated stably, or the steam in the first steam buffer tank 9 is insufficient, the valve Q may be opened only in step B5, and the steam in the second steam buffer tank 32 may be delivered into the synthesis reactor 11 through the reaction steam supply pipe 34; if the steam in the first steam buffer tank 9 is sufficient, the valve R may be only opened in step B5 to convey the steam in the first steam buffer tank 9 into the synthesis reactor 11 through the circulation pipe 93, and of course, the opening of the valve R, Q may be simultaneously opened and adjusted at this time, so as to avoid the large fluctuation of the steam in the first steam buffer tank 9 by simultaneously adjusting the amounts of the steam that can be supplied by the first steam buffer tank 9 and the second steam buffer tank 32.

In the present embodiment, when step B5 is regarded as the system start-up state, it is preferable to open only the reaction steam supply pipe 34, and the circulation pipe 93 is closed.

B6, calcium oxide in the synthesis reactor 11 reacts with part of water vapor and emits a large amount of heat, water in the water storage tank 25 is conveyed to the heat exchange equipment 27, and the heat generated by the reaction in the synthesis reactor 11 is absorbed to generate steam A; carrying out gas-solid separation on steam B and solid particles sent out from a discharge port of the synthesis reactor 11 through a second gas-solid separation device 13; the vapors A, B are all fed into the first vapor buffer tank 9.

In step B6, the water in the water storage tank 25 is preferably the water in the water storage tank 25 in the near-saturation state stored in step S8 during the energy storage and heat supply. By opening the valve M and starting the second water pump 26, the water in the water storage tank 25 can be conveyed to the heat exchange equipment 27, and after heat exchange, superheated steam of about 0.3-0.35 MPaG and 180 ℃ is generated, and is denoted as steam A for convenience of description.

In the step B5, a sufficient amount of steam is fed into the synthesis reactor 11, a part of the steam participates in the reaction, a part of the steam is used as a carrier gas flow, the carrier gas flow absorbs heat and heats up along with the progress of the reaction in the synthesis reactor 11, when the synthesis reactor 11 is discharged, a valve E is opened, the synthesis reactor 11 is discharged, and the discharge of the synthesis reactor 11 is subjected to first-stage gas-solid separation through a first-stage separator 39 (cyclone separator); then, the separated gaseous material is subjected to a second-stage gas-solid separation by a second-stage separator 42 (metal filter bag filter) so that the dust content of the superheated steam after the two-stage gas-solid separation <5mg/m ³ The valve G is opened so that the separated solid particles (most of the calcium hydroxide and a small part of the calcium oxide) fall into the second silo 15. Accordingly, the steam separated by the second gas-solid separation device 13 is lower in pressure (lower than 0.3 MPaG) and lower in yield than the steam a, and is referred to as steam B.

In this application, steam a and steam B enter the steam ejector 28 together, and after being mixed completely, are fed into the first steam buffer tank 9 for supplying steam to the steam using system 92.

In addition, taking into consideration that the first vapor buffer tank 9 supplies vapor to the outside and the first vapor buffer tank 9 supplies vapor through the circulation pipe 93, the energy-releasing and heat-supplying process further includes:

b7, detecting the pressure P1 in the first steam buffer tank 9 in real time through a first pressure detector;

b8, judging whether P1 is smaller than a second preset pressure; if yes, carrying out a step B9; if not, carrying out the step B10;

wherein the second preset pressure may be considered as satisfying a lower pressure limit for providing steam to the outside. Preferably, the second preset pressure is 0.3MPa.

B9, starting a heat supplementing pipe 33, supplementing steam to the first steam buffer tank 9 by utilizing the superheated steam in the second steam buffer tank 32, and returning to the step B3;

Because the pressure and the temperature in the second steam buffer tank 32 are relatively high, when the pressure in the first steam buffer tank 9 is insufficient or the external use steam amount is large, the steam in the first steam buffer tank 9 can be timely and efficiently supplemented through the second steam buffer tank 32, so that the stability of the steam supplied to the outside by the first steam buffer tank 9 is maintained; meanwhile, no matter fluctuation is generated in the energy release and heat supply process or the condition of sudden increase of the external steam demand, the heat supply system can be ensured to stably and continuously supply steam to the outside, and the operation elasticity of the heat supply system is improved.

B10, opening a steam supply pipeline 91 to supply steam to a steam utilization system 92;

wherein, through adjusting valve I, steam of the first steam buffer tank 9 is supplied to a steam using system 92 through a steam supply pipeline 91.

B11, judging whether P1 is more than or equal to a third preset pressure; if yes, go to step B12; if not, returning to the step B8;

b12, circulation pipe 93 is opened, and reaction steam supply pipe 34 is closed.

Wherein the third preset pressure may be regarded as satisfying the lower pressure limit of the first steam buffer tank 9 alone providing recycle steam (feed) to the synthesis reactor 11. Preferably, the third preset pressure is 0.34MPa. The cpu acquires P1 in real time and determines according to step B11, and when P1 is less than the third preset pressure, it indicates that the steam in the first steam buffer tank 9 has not reached the condition of independent circulation feeding, especially in the system start-up stage, it still needs the second steam buffer tank 32 to provide a certain amount of steam to the synthesis reactor 11 through the reaction steam supply pipe 34, and when P1 is greater than or equal to the third preset pressure, it indicates that the steam pressure in the first steam buffer tank 9 is sufficient and can reach the condition of independent circulation feeding, and at this time, the circulation pipe 93 is opened, and the reaction steam supply pipe 34 is closed.

Therefore, in the energy release and heat supply process, through the steps B7-B12, both fluctuation is generated in the energy release and heat supply process and the condition of sudden increase of the external steam demand is ensured, the heat supply system can stably and continuously supply steam to the outside, and the operation elasticity of the heat supply system is improved. In addition, through the setting of the third preset pressure, whether the first steam buffer tank 9 can independently and circularly feed the synthesis reactor 11 is judged, on one hand, the method is favorable for guaranteeing the water steam supply quantity conveyed into the synthesis reactor 11, so that the synthesis reactor 11 is subjected to more complete reaction, the stored chemical energy is favorably released fully, the efficiency of converting the chemical energy into heat energy in the energy releasing and heat supplying process of the system is improved, on the other hand, after the third preset pressure which is more than or equal to P1 is met, the reaction steam supply pipe 34 can be closed timely, the use of steam in the second steam buffer tank 32 is reduced, and correspondingly, the load of the steam generator 31 is favorably reduced, so that the use of extra power under the peak electricity period is reduced as much as possible.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims

1. The heat supply system is characterized by comprising a first steam buffer tank (9) and a thermochemical heat storage device, wherein the thermochemical heat storage device comprises a decomposition reactor (1), a first storage bin (6), a synthesis reactor (11) and a second storage bin (15) which are communicated end to end in sequence, a calcium-based material capable of being circularly conveyed is arranged in the thermochemical heat storage device, an energy supply device (2) is arranged in the decomposition reactor (1), a circulating pipe (93) of the first steam buffer tank (9) is communicated with the synthesis reactor (11), and part of steam in the first steam buffer tank (9) can be conveyed into the synthesis reactor (11); the inlet of the first steam buffer tank (9) is communicated with the decomposition reactor (1) through a first steam pipeline (5); the inlet of the first steam buffer tank (9) is communicated with the synthesis reactor (11) through a second steam pipeline (14), or steam produced by the synthesis reactor (11) is exhausted through the second steam pipeline (14).

2. A thermochemical heat accumulation energy storage heating system as claimed in claim 1, characterized in that the heating system comprises a water replenishing unit, the water replenishing unit comprises a water replenishing water source (19), a softening water tank (21), a heat exchanger (23) and a water storage tank (25) which are communicated in sequence, the softening water tank (21) is provided with a first water pipe (22), the first water pipe (22) is communicated with a low-temperature medium runner of the heat exchanger (23), and the first steam pipeline (5) is communicated with a high-temperature medium runner of the heat exchanger (23).

3. A thermochemical heat accumulation energy storage and heat supply system as in claim 2 wherein the synthesis reactor (11) is provided with a heat exchange device (27), the outlet of the water storage tank (25) being in communication with the inlet of the heat exchange device (27), the outlet of the heat exchange device (27) being in communication with the first steam buffer tank (9).

4. A thermochemical heat accumulation energy storage heating system according to claim 3, characterized in that the outlet of the second steam pipeline (14) or the heat exchange device (27) is provided with a steam ejector (28), the outlets of the second steam pipeline (14) and the heat exchange device (27) are connected with the inlet of the steam ejector (28), and the outlet of the steam ejector (28) is communicated with the first steam buffer tank (9).

5. A thermochemical heat accumulation energy storage heating system as claimed in claim 2, characterized in that the heating system comprises a steam supplementing unit, the steam supplementing unit comprises a steam generator (31) and a second steam buffer tank (32) which are sequentially connected, an inlet of the steam generator (31) is connected with the softening water tank (21) through a second water pipe (29), a steam outlet of the steam generator (31) is connected with an inlet of the second steam buffer tank (32), a heat supplementing pipe (33) is arranged at an outlet of the second steam buffer tank (32), and the heat supplementing pipe (33) is communicated with the first steam buffer tank (9).

6. A thermochemical heat accumulation energy storage heating system as in claim 5 wherein the outlet of the second vapor buffer tank (32) is provided with a reaction vapor supply tube (34), the reaction vapor supply tube (34) being in communication with the synthesis reactor (11).

7. A thermochemical heat accumulation energy storage heating system as claimed in claim 5 wherein the discharge port of the first silo (6) is provided with a first blanking device (7), the discharge port of the second silo (15) is provided with a second blanking device (16), the first blanking device (7) is communicated with the synthesis reactor (11), and the second blanking device (16) is communicated with the decomposition reactor (1).

8. A thermochemical heat accumulation energy storage heating system as in claim 7 wherein the outlet of the second steam buffer tank (32) is provided with a first charge steam pipe (35), the outlet of the first blanking device (7) is provided with a first blanking pipe (8), the synthesis reactor (11) is provided with a first feed pipe (10), the first charge steam pipe (35) or the first blanking pipe (8) is provided with a first throttling device (36), the first charge steam pipe (35) and the first blanking pipe (8) are respectively connected with the inlet of the first throttling device (36), and the outlet of the first throttling device (36) is connected with the first feed pipe (10);

The outlet of the second steam buffer tank (32) is provided with a second material carrying steam pipe (37), the outlet of the second discharging device (16) is provided with a second discharging pipe (17), the decomposition reactor (1) is provided with a second feeding pipeline (18), the second material carrying steam pipe (37) or the second discharging pipe (17) is provided with a second throttling device (38), the second material carrying steam pipe (37) and the second discharging pipe (17) are respectively connected with the inlet of the second throttling device (38), and the outlet of the second throttling device (38) is connected with the second feeding pipeline (18).

9. The thermochemical heat accumulation energy storage and heat supply system according to claim 1, wherein a first discharging pipeline (3) is arranged at a discharging hole of the decomposition reactor (1), the first discharging pipeline (3) is connected with a feeding hole of a first gas-solid separation device (4), a steam outlet of the first gas-solid separation device (4) is connected with a first steam pipeline (5), and a calcium-based material outlet of the first gas-solid separation device (4) is connected with an inlet of a first stock bin (6);

the discharge port of the synthesis reactor (11) is provided with a second discharge pipeline (12), the second discharge pipeline (12) is connected with the feed inlet of a second gas-solid separation device (13), the steam outlet of the second gas-solid separation device (13) is connected with a second steam pipeline (14), and the calcium-based material outlet of the second gas-solid separation device (13) is connected with the inlet of a second storage bin (15).

10. A thermochemical heat storage, energy storage and heat supply method, characterized in that the heat supply method is applied to the thermochemical heat storage, energy storage and heat supply system of any one of claims 1 to 9, and the heat supply method comprises an energy storage and heat supply process and an energy release and heat supply process;

the energy storage and heat supply process is characterized in that calcium hydroxide stored in a second storage bin (15) is conveyed into a decomposition reactor (1), the calcium hydroxide is heated and decomposed through an energy supply device (2), the generated calcium oxide is conveyed into a first storage bin (6) for storage, and the generated superheated steam is conveyed into a first steam buffer tank (9) for supplying steam to a steam utilization system (92);

the energy and heat release process is characterized in that calcium oxide stored in the first storage bin (6) is conveyed to the synthesis reactor (11), steam is conveyed into the synthesis reactor (11), the calcium oxide reacts with water in the synthesis reactor (11) to release heat, the heat is conveyed to the first steam buffer tank (9) in the form of superheated steam, steam is supplied to the steam utilization system (92), and generated calcium hydroxide is conveyed to the second storage bin (15) for storage.