CN-122015547-A - Multi-vapor source cooling system of thermochemical energy storage device and control method thereof

Abstract

The invention relates to the technical field of thermochemical energy storage, in particular to a thermochemical energy storage device multi-steam source cooling system which comprises a cooling steam supply unit, a cooling execution unit and a measurement and control unit, wherein the cooling steam supply unit comprises at least three mutually independent and switchable steam sources, the cooling execution unit comprises a cooling header communicated with each steam source, a cooling spray pipe with one end connected to the cooling header and the other end extending into a reactor, and the measurement and control unit comprises a header sensor for monitoring the steam state in the cooling header. According to the invention, by arranging three cooling steam branches of the reactor shell side, the steam drum side and the independent accident electric heater, a multiple redundant cooling supply system is constructed, the defects of fluctuation of cooling capacity along with a main process and insufficient safety margin during faults of a traditional single steam source are overcome, and meanwhile, the vertically arranged porous atomizing spray pipes are adopted, so that cooling steam can uniformly penetrate through the deep layer of a heat storage material in a planar form, and local hot spots are effectively eliminated.

Inventors

• HU LI
• YAO HAIYAN
• FAN WENLIANG
• ZHANG HENG
• HOU XIAODONG
• ZENG JIPING
• GUO YANQING
• DUAN HAILONG
• HAN JUNFEI

Assignees

• 鄂尔多斯市腾远煤炭有限责任公司
• 鄂尔多斯应用技术学院

Dates

Publication Date

20260512

Application Date

20251229

Claims (10)

1. 1. A thermochemical energy storage device multi-vapor source cooling system, comprising: A cooling steam supply unit comprising at least three mutually independent and switchable steam sources; A cooling execution unit comprising a cooling header (4) in communication with each of said steam sources, and a cooling lance (3) having one end connected to said cooling header (4) and the other end projecting into the interior of the reactor (a); And the measurement and control unit comprises a header sensor for monitoring the steam state in the cooling header (4), a temperature sensor for monitoring the surface temperature of the energy storage heater (1) in the reactor (A) and a pressure sensor for monitoring the steam pressure in the system, and the cooling steam supply unit selectively enables different steam sources based on the feedback of the measurement and control unit to provide cooling steam to the cooling execution unit when in operation.
2. 2. The thermochemical energy storage device multi-vapor source cooling system of claim 1, wherein the vapor source comprises a reactor shell side vapor leg, a drum side vapor leg, and an accident emergency vapor leg.
3. 3. A thermochemical energy storage device multi-vapor source cooling system as claimed in claim 2 wherein the reactor shell side vapor leg is connected to the shell side outlet of reactor (a) to take cooling vapor I directly from the shell side of reactor (a).
4. 4. A thermochemical energy storage device multi-source cooling system as claimed in claim 2, characterized in that the drum side steam branch is connected to the shell side of drum (B) to take cooling steam II from said drum (B).
5. 5. A thermochemical energy storage device multi-source cooling system according to claim 2, characterized in that the accident emergency steam branch comprises an accident electric heater (10) and a recovery water tank (C) in communication with the accident electric heater (10) to generate cooling steam III.
6. 6. The thermochemical energy storage device multi-source cooling system of claim 2, wherein the reactor shell side steam branch, the steam drum shell side steam branch, and the accident emergency steam branch are each provided with a regulating valve and a check valve.
7. 7. The multi-vapor source cooling system of a thermochemical energy storage device according to claim 2, characterized in that the cooling spray pipe (3) is a porous atomizing spray pipe which extends vertically into the heat storage material layer of the reactor (a).
8. 8. The multi-vapor source cooling system of a thermochemical energy storage device of claim 7, wherein a plurality of groups of openings are arranged on the pipe wall of the porous atomizing spray pipe at intervals along the axial direction of the porous atomizing spray pipe, and each group of openings comprises a plurality of atomizing holes uniformly formed in the circumferential direction of the pipe wall.
9. 9. A multi-source cooling control method based on the system according to any one of claims 2 to 8, characterized in that the method comprises the steps of: s1, acquiring running state parameters of a reactor (A) in real time, wherein the parameters at least comprise the surface temperature of an energy storage heater (1) and the system steam pressure; s2, judging the level of the current cooling working condition based on the running state parameters; S3, executing a corresponding cooling control strategy according to the cooling working condition grade: When the energy storage heater is in a first-stage working condition, the shell side steam branch of the reactor is started preferentially, and the steam flow of the energy storage heater is regulated dynamically according to the surface temperature of the energy storage heater (1); Strategy 2, when the reactor is in the second-stage working condition, the shell side steam branch of the reactor is gradually closed and is switched to be mainly or completely supplied by the shell side steam branch of the steam drum so as to strengthen cooling and reduce the pressure of the system; and 3, when the emergency working condition is in the third-stage emergency working condition, starting the accident emergency steam branch for cooling.
10. 10. The multi-source cooling control method according to claim 9, further comprising a heating pipe and saturation judging step of confirming that steam of a branch to be started has reached a preset saturation state based on data of the header sensor and completing a drain pipe heating pipe before starting any branch.

Description

Multi-vapor source cooling system of thermochemical energy storage device and control method thereof Technical Field The invention relates to the technical field of thermochemical energy storage, in particular to a thermochemical energy storage device multi-vapor source cooling system and a control method thereof. Background The thermochemical energy storage technology has received a great deal of attention in the fields of renewable energy consumption and industrial steam supply because of the advantages of high energy storage density, long-term storage and the like, and an electric heater in a reactor continuously runs at high power in the energy storage stage to generate a large amount of heat, so that a high-efficiency and reliable cooling system is required to be equipped for preventing equipment from being overheated and damaged. At present, the energy storage device generally adopts steam with a single source to cool, for example, only steam generated by a reactor is utilized, and the single steam source design has defects, such as the cooling capacity is seriously dependent on the running state of a main process, when the main process fluctuates or fails, the cooling capacity is lost, the system safety redundancy is low, meanwhile, the single pipeline is difficult to realize accurate and flexible regulation and control of steam flow and distribution, and cannot cope with complex working conditions of rapid change or local overheating of heating power, and in actual operation, particularly in peak regulation scenes requiring rapid response, the defects become one of the bottlenecks for limiting the power lifting and long-term safe operation of the device. Disclosure of Invention Therefore, the invention aims to provide a multi-vapor source cooling system of a thermochemical energy storage device and a control method thereof, so as to solve the technical problem of single air source of the traditional thermochemical energy storage cooling system. Based on the above object, the present invention provides a multi-vapor source cooling system of a thermochemical energy storage device, comprising: A cooling steam supply unit comprising at least three mutually independent and switchable steam sources; A cooling execution unit comprising a cooling header in communication with each of the vapor sources, and a cooling nozzle having one end connected to the cooling header and the other end extending into the interior of the reactor; And the measurement and control unit comprises a header sensor for monitoring the steam state in the cooling header, a temperature sensor for monitoring the surface temperature of the energy storage heater in the reactor and a pressure sensor for monitoring the steam pressure in the system, and the cooling steam supply unit selectively enables different steam sources based on the feedback of the measurement and control unit to provide cooling steam to the cooling execution unit when in operation. As a preferred technical scheme of the invention, the steam source comprises a reactor shell side steam branch, a steam drum shell side steam branch and an accident emergency steam branch. As a preferred solution of the invention, the reactor shell side steam branch is connected to the shell side outlet of the reactor to obtain cooling steam I directly from the shell side of the reactor. As a preferred solution of the invention, the drum side steam branch is connected to the shell side of the drum to obtain cooling steam II from the drum. As a preferred technical scheme of the invention, the accident emergency steam branch comprises an accident electric heater and a recovery water tank communicated with the accident electric heater so as to generate cooling steam III. As the preferable technical scheme of the invention, the reactor shell side steam branch, the steam drum shell side steam branch and the accident emergency steam branch are respectively provided with a regulating valve and a check valve. As a preferable technical scheme of the invention, the cooling spray pipe is a porous atomization spray pipe which vertically stretches into the heat storage material layer of the reactor. As a preferable technical scheme of the invention, a plurality of groups of opening groups are arranged on the pipe wall of the porous atomizing spray pipe at intervals along the axial direction of the pipe wall, and each group of opening groups comprises a plurality of atomizing holes uniformly arranged on the circumferential direction of the pipe wall. In order to better solve the technical problems, the invention also provides a multi-vapor source cooling control method based on any one of the systems, which comprises the following steps: S1, acquiring running state parameters of a reactor in real time, wherein the parameters at least comprise the surface temperature of an energy storage heater and the steam pressure of a system; s2, judging the level of the current cooling working condition based on the