CN110550375A - Heat accumulating type compressed air energy storage device - Google Patents

Abstract

The invention relates to the technical field of energy storage, and provides a heat accumulating type compressed air energy storage device. The device comprises a strengthening block and a cavity formed in a mountain, wherein the strengthening block blocks a hole opening of the cavity, a first flow divider and a second flow divider are sequentially arranged in the cavity from the strengthening block to the hole bottom of the cavity, and the second flow divider divides the space between the first flow divider and the hole bottom of the cavity into a heat storage cavity and a gas storage cavity; the heat storage cavity is arranged close to the reinforced block body, and heat storage materials are filled in the heat storage cavity; the strengthening block transversely penetrates through a first channel communicated with the first flow divider, and a valve is arranged on the first channel. The invention not only realizes the integrated design of heat energy storage and potential energy storage, greatly reduces the complexity of the whole device, but also reduces the cost and the occupied area. In addition, the invention adopts the strengthening block to block the hole opening of the cavity, thereby not only ensuring the air tightness and the strength of the cavity, but also meeting the requirements of high-pressure gas storage safety and high efficiency.

Description

Regenerative compressed air energy storage device

technical field

The invention relates to the technical field of energy storage, in particular to a regenerative compressed air energy storage device.

Background technique

Compressed air energy storage is a new energy storage technology. Energy storage, especially electric energy storage, is of great significance to the optimization of energy structure and the regulation of power grid operation. In 1978, Germany built the world's first demonstration compressed air energy storage power station, followed by the United States, Japan and Israel. The working principle of the compressed air energy storage power generation system is similar to that of pumped water storage. When the power consumption of the power system is at a low point, the system energy storage uses the surplus electric energy to drive the air compressor to compress the air, and stores the electric energy in the form of compressed air in the In the gas storage device; when the electricity load of the power system reaches the peak and the power generation is insufficient, the system releases energy, that is, the gas storage device releases the stored compressed air, and the compressed air and fuel are mixed and burned in the combustion chamber, and the high-temperature gas generated by the combustion The expansion works in the turbo expander and drives the generator to generate electricity, thus completing the conversion of electric energy-air potential energy-electric energy.

The existing adiabatic compressed air energy storage system abandons the technical route of improving the working capacity of compressed air by consuming fuel. In the energy storage stage, the surplus electric energy is converted into thermal energy and air potential energy, which are stored separately. In the energy release stage, the system itself is used to store The thermal energy heats the turboexpander intake air. It can be seen that the adiabatic compressed air energy storage system stores thermal energy and potential energy independently in the energy storage stage, and couples thermal energy and potential energy in the energy release stage, which not only meets the requirements of the turbo expander for the inlet temperature, but also avoids carbon emission. Because the current adiabatic compressed air energy storage system needs to set up a special pressure vessel to store compressed air when storing potential energy, and at the same time needs to set up a special heat accumulator and heat exchanger group when storing thermal energy, so the structure of the adiabatic compressed air energy storage system is complicated. , high cost and large floor area.

Contents of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

The purpose of the present invention is to provide a thermal storage type compressed air energy storage device to solve the technical problems of the existing adiabatic compressed air energy storage system with complex structure, high cost and large occupied area.

In order to achieve the above object, the present invention provides a regenerative compressed air energy storage device, which includes a reinforced block and a cavity formed in the mountain body, the reinforced block blocks the opening of the cavity, and the A first flow divider and a second flow divider are sequentially provided in the cavity from the reinforcement block to the bottom of the cavity, and the second flow divider places the cavity at the first flow divider The space between the bottom of the cavity and the cavity is divided into a heat storage chamber and an air storage chamber; the heat storage chamber is arranged adjacent to the reinforcement block, and the heat storage chamber is filled with heat storage materials; the reinforcement block A first channel communicating with the first flow divider is opened transversely through the body, and a valve is provided on the first channel.

Wherein, the inner wall of the first channel, the side wall of the heat storage cavity, and the side of the first flow divider and the second flow divider facing away from the heat storage cavity are all laid with a thermal insulation layer. The thermal insulation layer on the second flow divider is provided with a second channel for communicating with the second flow divider and the gas storage cavity.

Wherein, the first flow divider leans against the reinforcing block, and the side of the second flow divider facing away from the heat storage chamber is provided with a support wall, and the support wall is opened for communication with the The air vent between the second flow divider and the air storage cavity.

Wherein, the first channel is arranged at the lower part of the reinforcing block.

Wherein, the cavity is a natural cavity or an artificial cavity.

Wherein, the heat storage material is in granular form.

Wherein, the strengthening block is casted by cement.

Wherein, the reinforcing block has a tapered structure, and the large end of the reinforcing block is arranged toward the first flow divider; the opening of the cavity is opened as a tapered hole suitable for the reinforcing block.

Wherein, serrated protrusions are evenly distributed on the outer wall of the reinforcing block, and serrated grooves matching the serrated protrusions are opened on the inner wall of the cavity.

The invention makes full use of the cavities formed in the mountain, and integrates the heat storage cavity and the gas storage cavity in the cavity, which not only realizes the integrated design of thermal energy storage and potential energy storage, greatly reduces the complexity of the whole device, but also Reduced cost and footprint. In addition, the present invention uses reinforced blocks to seal the opening of the cavity, which not only ensures the airtightness and strength of the cavity, but also meets the requirements for high-pressure gas storage safety and high efficiency.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are For some embodiments of the present invention, those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a structural schematic diagram of a regenerative compressed air energy storage device in an embodiment of the present invention.

Reference signs:

1. Reinforced block; 1.1. First channel; 1.2. Saw-toothed protrusion; 2. First diverter; 3. Second diverter; 4. Heat storage cavity; 5. Gas storage cavity; 6. Heat storage material ; 7. Thermal insulation layer; 7.1. Second channel; 8. Support wall; 8.1. Air vent.

Detailed ways

In order to make the purpose, technical solutions and advantages of the invention clearer, the technical solutions in the invention will be clearly described below in conjunction with the accompanying drawings in the invention. Obviously, the described embodiments are part of the embodiments of the invention, not all of them. Example. Based on the embodiments of the invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the invention.

In the description of the present invention, unless otherwise specified, the orientation or positional relationship indicated by the terms "inside", "outside" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. It is not intended to indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and operate in a particular orientation, and thus should not be construed as limiting the invention.

It should be noted that, unless otherwise clearly stipulated and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or through Intermediaries are indirectly connected. Those of ordinary skill in the art can understand the specific meanings of the above terms in the invention in specific situations.

As shown in Figure 1, this embodiment provides a regenerative compressed air energy storage device, which includes a reinforced block 1 and a cavity formed in the mountain, the reinforced block 1 is blocked at the opening of the cavity, and the cavity In the direction from the reinforcement block 1 to the bottom of the cavity, a first flow divider 2 and a second flow divider 3 are arranged in sequence, and the second flow divider 3 positions the cavity between the first flow divider 2 and the bottom of the cavity The space is divided into a heat storage chamber 4 and an air storage chamber 5; the heat storage chamber 4 is set adjacent to the reinforced block 1, and the heat storage chamber 4 is filled with a heat storage material 6; 2 communicated with the first channel 1.1, the first channel 1.1 is provided with a valve. Wherein, the cavity can be a natural cavity, and can also be a man-made cavity, that is, a cavity excavated artificially on a mountain body.

When storing energy: connect the external high-temperature gas source to the first channel 1.1, and open the valve. At this time, the high-temperature and high-pressure gas discharged from the external high-temperature gas source flows to the first flow divider 2 through the first channel 1.1. The high-temperature and high-pressure gas flows into the heat storage chamber 4 evenly after being distributed by the first flow divider 2. The high-temperature and high-pressure gas flowing through the heat storage chamber 4 continuously exchanges heat with the heat storage material 6 in the heat storage chamber 4. The high-temperature and high-pressure gas transfers its own heat After being transferred to the heat storage material 6, it is transformed into a high-pressure low-temperature gas. The high-pressure and low-temperature gas flows into the gas storage chamber 5 through the second flow divider 3 for storage. As the high-temperature and high-pressure gas discharged from the external high-temperature gas source continuously flows into the heat storage chamber 4, the heat stored in the heat storage material 6 also increases accordingly. It can be seen that during the whole energy storage stage, thermal energy is continuously stored in the heat storage chamber 4 and potential energy is continuously stored in the gas storage chamber 5 . At the end of energy storage, it is sufficient to close the valve and disconnect the external high-temperature gas source from the first channel 1.1. It should be noted that the pressure in the heat storage chamber 4 is the same as the pressure in the air storage chamber 5 after the valve is closed and the gas supply is stopped, and the flow resistance in the heat storage chamber 4 is large due to the existence of the heat storage material 6, so the air storage chamber The high-pressure and low-temperature gas stored in the 5 will not flow back into the heat storage chamber 4.

When releasing energy: connect the external gas load with the first channel 1.1, and open the valve. At this time, the heat storage chamber 4 is connected with the external gas load, the pressure in the gas storage chamber 5 is higher than the pressure in the heat storage chamber 4, and the high-pressure and low-temperature gas stored in the gas storage chamber 5 is distributed evenly by the second flow divider 3 Flowing into the heat storage chamber 4, the high-pressure and low-temperature gas flowing through the heat storage chamber 4 continuously exchanges heat with the heat storage material 6 in the heat storage chamber 4, and the high-pressure and low-temperature gas absorbs heat from the heat storage material 6 and then transforms into a high-temperature and high-pressure gas. The high-temperature and high-pressure gas flows into the external gas load through the first flow divider 2 and the first channel 1.1 in sequence, thereby completing the coupling of thermal energy and potential energy.

It should be noted that the above-mentioned external high-temperature gas source may be but not limited to a compressor, and the external gas load may be but not limited to a turbo expander.

It can be seen that the device makes full use of the cavity formed in the mountain, and integrates the heat storage chamber 4 and the gas storage chamber 5 in the cavity, which not only realizes the integrated design of thermal energy storage and potential energy storage, but also greatly reduces the complexity of the entire device. degree, but also reduces cost and footprint. In addition, the device uses a reinforced block 1 to seal the opening of the cavity, which not only ensures the airtightness and strength of the cavity, but also meets the requirements for high-pressure gas storage safety and high efficiency.

Furthermore, in order to reduce the heat leakage along the way when the high-temperature and high-pressure gas flows in the first channel 1.1, the inner wall of the first channel 1.1 is laid with a thermal insulation layer 7. At the same time, in order to reduce the heat leakage of the heat storage chamber 4, the side wall of the heat storage chamber 4 and the side of the first flow divider 2 and the second flow divider 3 facing away from the heat storage chamber 4 are all laid with a thermal insulation layer 7, The thermal insulation layer 7 laid on the second flow divider 3 is provided with a second channel 7.1 for connecting the second flow divider 3 and the gas storage cavity 5 .

In addition, considering that the heat storage material in the heat storage chamber 4 will be subjected to double stress caused by pressure and temperature during the heat storage and energy release process, in order to prevent the heat storage material 6 from collapsing under the reciprocating loading of the double stress, the first shunt The device 2 leans against the reinforced block 1, and the side of the second flow divider 3 facing away from the heat storage chamber 4 is provided with a support wall 8, and a support wall 8 is provided on the support wall 8 for connecting the second flow divider 3 and the gas storage chamber 5. Vents 8.1. Therefore, the first flow divider 2 cannot move away from the second flow divider 3 when it is constrained by the reinforcement block 1 , and the second flow divider 3 cannot move away from the first flow divider 2 because it is constrained by the support wall 8 As a result, the heat storage material 6 filled between the first flow divider 2 and the second flow divider 3 cannot collapse. In addition, in order to improve heat exchange efficiency and ensure that gaps are naturally formed between the heat storage materials 6 in the heat storage chamber 4, the heat storage materials 6 are preferably in the form of particles. Therefore, when the high-temperature and high-pressure gas or the high-pressure and low-temperature gas passes through the heat storage chamber 4 , the gap between the heat storage materials 6 will be filled, and the gas filled in the gap can fully exchange heat with the heat storage material 6 .

Preferably, the first channel 1.1 is arranged at the lower part of the reinforcement block 1 . The advantage of this arrangement is that since the hot air flows upwards, by setting the first channel 1.1 at the lower part of the reinforcement block 1, the high-temperature and high-pressure gas will automatically flow upwards when it flows to the first separator through the first channel 1.1 during energy storage. , and then the intake air in the heat storage chamber 4 can be made more uniform.

Preferably, the reinforcement block 1 is in a tapered structure, and the large end of the reinforcement block 1 is set toward the first flow divider 2, that is to say, the small end of the reinforcement block 1 is set outward; Body 1 fits into the tapered hole. It should be noted that the outside here refers to the bottom of the cavity as a reference, the direction approaching the bottom of the hole is the inside, and the direction away from the bottom is the outside. The advantage of this setting is that: on the one hand, when the pressure in the cavity rises, the pressure acting on the large end of the reinforcement block 1 will be transmitted to the wall of the cavity through the tapered surface of the reinforcement block 1, preventing the reinforcement block 1 from being ejected or fracture. On the other hand, since the opening of the cavity is a tapered hole suitable for the reinforcement block 1, the large end of the reinforcement block 1 faces inward and the small end faces outward, that is to say, the longitudinal cross-sectional dimension of the reinforcement block 1 It gradually decreases outward, so it is difficult for the reinforced block 1 to be pushed out due to the constraint of the side wall of the cavity opening. Wherein, the reinforced block 1 can be processed by curing with a curing agent, for example, the reinforced block 1 is formed by pouring cement. Of course, the reinforced block body 1 can also be formed by stacking bricks.

In addition, in order to further improve the sealing between the reinforcement block 1 and the side wall of the cavity, the outer wall of the reinforcement block 1 is evenly distributed with serrated protrusions 1.2, and the inner wall of the cavity is provided with serrations that cooperate with the serration protrusions 1.2. shaped groove. Thus, through the cooperation of the serrated protrusions 1.2 and the serrated grooves, the length of the contact surface between the reinforced block 1 and the side wall of the cavity can be extended to increase the resistance along the process and prevent the gas in the cavity from flowing from the reinforced block. 1 and the cavity sidewall leaks out.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical scheme of the invention, rather than limiting it; although the invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it still can The technical solutions described in the foregoing embodiments are modified, or some of the technical features are replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the invention.

Claims (9)

1. A regenerative compressed air energy storage device, characterized in that it includes a reinforced block and a cavity formed in the mountain, the reinforced block is blocked at the opening of the cavity, and the cavity is formed from the The direction from the strengthening block to the bottom of the cavity is provided with a first flow divider and a second flow divider in sequence, and the second flow divider places the cavity between the first flow divider and the cavity The space between the bottom of the hole is divided into a heat storage chamber and an air storage chamber; the heat storage chamber is arranged adjacent to the reinforced block, and the heat storage chamber is filled with heat storage materials; A first passage communicated with the first flow divider, and a valve is arranged on the first passage. 2. The regenerative compressed air energy storage device according to claim 1, characterized in that, the inner wall of the first channel, the side wall of the heat storage cavity, the first flow divider and the second A thermal insulation layer is laid on the side of the splitter facing away from the heat storage cavity, and a thermal insulation layer laid on the second splitter is provided with a first opening for communicating the second splitter with the gas storage cavity. Two channels. 3. The regenerative compressed air energy storage device according to claim 1, characterized in that, the first flow divider abuts against the reinforced block, and the second flow divider faces away from the heat storage One side of the chamber is provided with a support wall, and the support wall is provided with a vent for connecting the second flow divider and the gas storage chamber. 4. The regenerative compressed air energy storage device according to claim 1, characterized in that, the first channel is provided at the lower part of the reinforced block. 5. The regenerative compressed air energy storage device according to claim 1, wherein the cavity is a natural cavity or an artificial cavity. 6 . The regenerative compressed air energy storage device according to claim 1 , wherein the regenerative material is in granular form. 7 . 7. The regenerative compressed air energy storage device according to claim 1, wherein the reinforced block is made of cement. 8. The regenerative compressed air energy storage device according to any one of claims 1 to 7, characterized in that, the reinforcing block has a conical structure, and the large end of the reinforcing block faces the first The splitter is set; the opening of the cavity is opened as a tapered hole suitable for the strengthening block. 9. The regenerative compressed air energy storage device according to any one of claims 1 to 7, characterized in that, the outer wall of the reinforced block is evenly distributed with serrated protrusions, and the inner wall of the cavity is provided with Serrated grooves cooperating with said serrated protrusions.