阅读说明：本技术 一种基于光热移动床的可连续式储热系统 (Continuous heat storage system based on photo-thermal moving bed ) 是由 魏思雨 苏彦麟 李俊峰 韩瑞 周伟 高继慧 秦裕琨 于 2019-11-20 设计创作，主要内容包括：一种基于光热移动床的可连续式储热系统,属于太阳能热存储领域。自动进料装置的出料端与光热反应器的内管的进料端连接,光热反应器通过支撑架支撑并呈倾斜设置,光热反应器的出料端低于进料端,物料收集装置设置在光热反应器的出料端下方,传动系统中的链条穿入自动进料装置及光热反应器,储热材料加入自动进料装置中,并经传动系统中的链条带动进入光热反应器,再由光热反应器的出料口落入物料收集装置中。本发明无需在光热、热储存过程中设置复杂的传热部件,直接吸收太阳光进行光热转换,并将热量储存在吸附式储热材料中。搭建移动床系统实现水分脱附及储热,通过链条传动有效解决高含水量吸附剂团聚、粘壁问题,使得系统连续运行且可靠性好。(A continuous heat storage system based on a photo-thermal moving bed belongs to the field of solar heat storage. The discharge end of automatic feed device is connected with the feed end of the inner tube of optothermal reactor, optothermal reactor supports and is the slope setting through the support frame, the discharge end of optothermal reactor is less than the feed end, material collection device sets up the discharge end below at optothermal reactor, the chain among the transmission system penetrates automatic feed device and optothermal reactor, heat-retaining material adds in the automatic feed device, and drive into optothermal reactor through the chain among the transmission system, the discharge gate by optothermal reactor falls into material collection device again. The invention directly absorbs sunlight to carry out photothermal conversion without arranging complex heat transfer components in the photothermal and thermal storage processes, and stores heat in the adsorption type heat storage material. The moving bed system is built to realize moisture desorption and heat storage, and the problems of agglomeration and wall adhesion of the high-water-content adsorbent are effectively solved through chain transmission, so that the system can continuously operate and has good reliability.)

1. The utility model provides a but continuous type heat-retaining system based on light and heat removes bed which characterized in that: the device comprises an automatic feeding device, a photo-thermal reactor, a transmission system, a material collecting device (2), a support frame (1) and a heat storage material, wherein the discharge end of the automatic feeding device is connected with the feed end of an inner tube (3) of the photo-thermal reactor, the photo-thermal reactor is supported by the support frame (1) and is obliquely arranged, the discharge end of the photo-thermal reactor is lower than the feed end, the material collecting device (2) is arranged below the discharge end of the photo-thermal reactor, a chain (4) in the transmission system penetrates through the automatic feeding device and the photo-thermal reactor, the heat storage material is added into the automatic feeding device and is driven by the chain (4) in the transmission system to enter the photo-thermal reactor, and then the discharge hole of the photo-thermal reactor falls into the material collecting device (2).

2. The system of claim 1, wherein the system comprises: the automatic feeding device comprises a front guide pipe (5), a storage bin (6) and a rear guide pipe (7); the bottom of the front side wall and the bottom of the rear side wall of the storage bin (6) are both provided with through holes, the through holes on the front side of the storage bin (6) are communicated with the rear end of the front guide pipe (5), the through holes on the rear side wall of the storage bin (6) are communicated with the front end of the rear guide pipe (7), the front part of the side wall of the rear guide pipe (7) is provided with a plurality of exhaust holes (8), the storage bin (6) is obliquely arranged, the inclination angle of the storage bin (6) is the same as that of the photo-thermal reactor, and the inclination angle formed; the heat storage material is added from a storage bin (6).

3. The system of claim 2, wherein the system comprises: the photothermal reactor is a double-layer tube structure formed by sleeving an inner tube (3) and an outer tube (9), the outer tube (9) is a glass tube, a selective absorption coating is arranged on the outer wall of the inner tube (3), a vacuum closed cavity is formed between the inner tube (3) and the outer tube (9), and two ends of the inner tube (3) extend out of the outer tube (9); the chain (4) carries heat storage materials into the inner tube (3).

4. A continuous thermal storage system based on a photothermal moving bed according to claim 3, wherein: the material of the selective absorption coating is SS-AlNx/Cu.

5. The system of claim 1, wherein the system comprises: the transmission system comprises a motor (10), a chain (4) and three chain wheels, wherein the three chain wheels comprise a driving chain wheel (11) and two driven chain wheels (12), the driving chain wheel (11) is fixedly arranged on an output shaft of the motor (10), the motor (10) is arranged outside the discharge end of the photothermal reactor and is fixed on the ground through a motor frame (13), wheel shafts of the two driven chain wheels (12) are fixed on a support frame (1), the two driven chain wheels (12) are correspondingly arranged up and down, the driving chain wheel (11) and the two driven chain wheels (12) are connected through the chain (4), the motor (10) is connected with a pulse controller (14), the pulse controller (14) is connected with a speed regulator (15), and the speed regulator (15) is connected with a power supply (16).

6. The system of claim 1, wherein the system comprises: the support frame (1) is a height-adjustable support frame which comprises two frame bodies and two groups of sleeves; every sleeve pipe of group all includes interior sleeve pipe and outer tube, two support bodies are the setting in the below of photothermal reactor of one high one low by preceding to the back, the outer tube lower extreme in every sleeve pipe of group and the support body upper end fixed connection that corresponds, interior sleeve pipe lower extreme suit in every sleeve pipe of group is in the outer tube that corresponds, all along radially being equipped with several screw through-hole on every outer tube, several screw through-hole sets up along the direction of height of outer tube equidistant, and interior sleeve pipe and outer tube pass through the jackscrew fixed connection in the corresponding screw through-hole of screw in.

7. The system of claim 1, wherein the system comprises: the heat storage material is a hydrated salt adsorbent which is one or a combination of at least two of chloride, bromide, iodide, hydride and oxide.

8. The system of claim 7, wherein the system comprises: the chloride salt is magnesium chloride, manganese chloride, magnesium chloride, calcium chloride, lithium chloride, potassium chloride or barium chloride; the bromide salt is magnesium bromide, barium bromide, sodium bromide, strontium bromide, lithium bromide or manganese bromide; the nitrate is calcium nitrate or lithium nitrate; the sulfate is magnesium sulfate, calcium sulfate or copper sulfate.

Technical Field

The invention belongs to the field of solar heat storage, and particularly relates to a continuous heat storage system based on a photo-thermal moving bed.

Background

Solar energy resources in China are very rich, and annual radiation quantity exceeds 5000MJ/m²The land area of (2) occupies more than 96 percent of the land area. The bottleneck of renewable energy source utilization such as solar energy lies in the intermittency and instability of energy source, which results in mismatching of the heat supply side and the demand side, and the heat storage technology is an effective method for solving the problem. The chemical heat storage has the advantages of high energy density, no need of heat insulation protection, long storage period and the like, and is the preferred choice for solar heat storage.

The hydrous salt adsorption type heat storage has the characteristics of high heat storage density, matching of a reaction temperature range (20-150 ℃) with building heating, environmental friendliness, life health and the like, and is increasingly concerned by researchers. The hydrated salt achieves storage/release of thermal energy through adsorption/desorption of water vapor. During heat storage, the hydrated salt absorbs heat and is decomposed into salt and water vapor, the water vapor is discharged out of the system, and at the moment, the heat energy is converted into chemical energy to be stored in the hydrated salt; upon release of heat, the salt undergoes a hydration reaction with the water vapor, releasing the stored chemical energy in the form of heat. The key for ensuring the stable operation of the system is the smooth diffusion of water vapor and the efficient transfer of heat in the heat storage/release process.

Currently, most of the hydrous salt adsorption heat storage utilizes a fixed bed reactor to carry out desorption reaction so as to realize heat storage. Although the fixed bed reactor has the advantages of simple structure, convenient operation and the like, the problems of adsorbent agglomeration, caking and the like exist in the fixed bed reactor, so that adsorbate cannot effectively react with all adsorbent particles in time. Only a small amount (15%) of the sorbent remained to react after multiple storage/exotherm cycles, which severely affected the overall thermal uniformity and operating stability of the reactor. In addition, the current heat storage reactors cannot directly utilize the heat of solar energy, and commercial photo-thermal vacuum tubes or heat collectors are needed, and heat is transferred to the reactors by using heat transfer media and heat exchangers, so that desorption heat storage is generated. Therefore, the existing heat storage system has a complex structure and low utilization rate of solar energy.

Disclosure of Invention

The invention aims to provide a continuous heat storage system based on a photothermal moving bed, aiming at the problems of material agglomeration, poor mass and heat transfer performance, complex heat storage system and the like of the traditional hydrous salt adsorption type heat storage reactor.

The invention provides a continuous heat storage system based on a photothermal moving bed, wherein heat storage materials can move at a constant speed in a photothermal reactor, and meanwhile, solar vacuum tubes (namely an inner tube and an outer tube which are sleeved with each other) are used as the photothermal reactor, so that the heat storage materials are desorbed by utilizing high temperature generated by the tube wall in the moving process, and the phenomenon of agglomeration of the heat storage materials is avoided while heat storage is carried out, thereby realizing in-situ thermal conversion and continuous thermochemical storage of solar energy.

The invention adopts the following technical scheme:

a continuous heat storage system based on a photothermal moving bed comprises an automatic feeding device, a photothermal reactor, a transmission system, a material collecting device, a supporting frame and a heat storage material, wherein a discharging end of the automatic feeding device is connected with a feeding end of an inner tube of the photothermal reactor, the photothermal reactor is supported by the supporting frame and is obliquely arranged, a discharging end of the photothermal reactor is lower than the feeding end, the material collecting device is arranged below the discharging end of the photothermal reactor, a chain in the transmission system penetrates through the automatic feeding device and the photothermal reactor, the heat storage material is added into the automatic feeding device, is driven by the chain in the transmission system to enter the photothermal reactor, and then falls into the material collecting device through a discharging port of the photothermal reactor.

Compared with the prior art, the invention has the beneficial effects that:

(1) the system does not need to arrange complex heat transfer components in the photo-thermal and thermal storage processes, directly absorbs sunlight to carry out photo-thermal conversion, and stores heat in the adsorption type heat storage material.

(2) A moving bed system is built (a chain runs slowly in a photo-thermal reactor) to realize moisture desorption and heat storage, and the problems of agglomeration and wall adhesion of the high-moisture-content adsorbent are effectively solved through chain transmission, so that the system can run continuously and has better reliability.

Drawings

FIG. 1 is a front view of a continuous thermal storage system based on a light-to-heat moving bed of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a partial enlarged view of FIG. 1 at B;

FIG. 4 is an enlarged view of a portion of FIG. 1 at C;

fig. 5 is a block diagram of the motor in connection with the pulse controller, speed governor and power supply.

The names and reference numbers of the components referred to in the above figures are as follows:

the device comprises a support frame 1, a material collecting device 2, an inner pipe 3, a chain 4, a front guide pipe 5, a storage bin 6, a rear guide pipe 7, an exhaust hole 8, an outer pipe 9, a motor 10, a driving chain wheel 11, a driven chain wheel 12, a motor frame 13, a pulse controller 14, a speed regulator 15 and a power supply 16.

Detailed Description

The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.