Compressed air waste heat recycling system

Abstract

The utility model relates to the technical field of compressed air storage, and discloses a compressed air waste heat recycling system which comprises an air compressor, a box body is arranged on the outer side of a shell of the air compressor, the box body is connected with a steam turbine through a steam pipeline, water is filled in the box body, and the periphery of the shell of the air compressor is coated with the water. The air compressor generates heat to boil water to generate steam, the steam drives the steam turbine to work, and the steam turbine directly drives the air compressor to work or drives the air compressor to work in a power generation mode. The box body is arranged on the periphery of the air compressor, water is injected into the box body, generated steam enters the steam turbine to drive the steam turbine to work, the steam turbine is connected with the generator, and generated electric energy is returned to drive the air compressor again; or the steam turbine and the air compressor are coaxially arranged, the steam turbine directly assists in driving the air compressor, energy consumption of the air compressor is saved, working heat of the air compressor is directly utilized, and waste of waste heat is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of compressed air storage, in particular to a compressed air waste heat recovery and utilization system. Background Art

[0002] Currently, compressed air energy storage is a mature energy storage and power generation method. Air compressors use electricity to compress air, store the compressed air, and re-expand it to generate electricity when needed. However, when the air compressor is running, a large part of the energy is converted into heat energy during the electrical energy conversion process when compressing the air. The loss of this energy reduces the energy storage efficiency of the air compressor.

[0003] Invention patent CN115573882A discloses a water-based compressed air energy storage system and energy storage method suitable for large-scale energy storage, which can drive steam turbines to generate electricity through high-pressure and high-temperature steam. It does not require a large amount of water resources or a large water level drop to achieve large-scale energy storage and power generation. This solution converts liquid water into water vapor based on compressed air, but during the operation of the air compressor unit, the air compressor itself will dissipate a large amount of heat, and this solution cannot utilize this part of the heat; in addition, the waste heat utilization of this solution requires the additional installation of heat accumulators, heating devices, high-pressure steam chambers and other structures, which are relatively complex in structure and have high system modification costs. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a compressed air waste heat recovery and utilization system, by arranging a box body around the air compressor and injecting water, the air compressor generates heat to boil the water to produce water vapor, the water vapor enters the steam turbine through the steam pipeline to drive the steam turbine to work, the steam turbine is connected to the generator to generate electricity, and the generator returns the generated electricity to drive the air compressor again; or the steam turbine and the air compressor are coaxially arranged and connected, the steam turbine directly assists in driving the air compressor, saving the energy consumption of the air compressor, realizing the direct utilization of the working heat of the air compressor, and reducing the waste of waste heat.

[0005] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0006] A compressed air waste heat recovery and utilization system comprises an air compressor, wherein a box is arranged outside a shell of the air compressor, the box is connected to a steam turbine through a steam pipeline, water is filled in the box, and the water covers the periphery of the shell of the air compressor, the air compressor generates heat to boil the water to generate water vapor, and the water vapor drives the steam turbine to work, and the operation of the steam turbine directly drives the air compressor to work or drives the air compressor to work by generating electricity.

[0007] As a further implementation method, the box is connected to the input end of the steam turbine through a steam pipeline, and the output end of the steam turbine is connected to a generator, and the generator generates electricity for secondary use to drive the air compressor again.

[0008] As a further implementation, the box is connected to the input end of the steam turbine through a steam pipeline, and the output end of the steam turbine is connected to the air compressor.

[0009] As a further implementation, the rotation center of the steam turbine output end is coaxially connected to the rotation shaft center of the air compressor.

[0010] As a further implementation, the rotation center of the steam turbine output end is connected to the rotation shaft center of the air compressor through a mechanical structure.

[0011] As a further implementation, the box body is sealedly connected to a shell of the air compressor.

[0012] As a further implementation, the box body is provided with an opening at the top, and is connected to a water tank through the opening.

[0013] As a further implementation, the water tank is connected to the top opening of the tank body through a water outlet pipeline.

[0014] As a further implementation, a liquid level sensor is provided on the inner wall of the box body.

[0015] As a further implementation, a switch valve is provided on the water outlet pipeline, and the switch valve is electrically connected to the liquid level sensor.

[0016] The beneficial effects of the above utility model are as follows:

[0017] 1. The utility model arranges a box body around the air compressor and injects water into it. The air compressor generates heat to boil the water to generate water vapor. The water vapor enters the steam turbine through the steam pipeline to drive the steam turbine to work. The steam turbine is connected to the generator to generate electric energy. The generator returns the generated electric energy to drive the air compressor again. Alternatively, the steam turbine and the air compressor are coaxially arranged and connected. The steam turbine directly assists in driving the air compressor, saving the energy consumption of the air compressor, realizing the direct use of the working heat of the air compressor, and reducing the waste of waste heat.

[0018] 2. The setting of the water tank and the liquid level sensor of the utility model can automatically replenish water to the tank when the liquid level in the tank is low, thereby realizing continuous use of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0020] Figure 1 It is a schematic diagram of the overall structure of the waste heat recovery system in the first embodiment of the utility model;

[0021] Figure 2 It is a schematic diagram of the overall structure of the waste heat recovery system in the second embodiment of the present utility model.

[0022] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0023] Among them: 1. Air compressor, 2. Box, 3. Steam turbine, 4. Generator, 5. Steam pipeline, 6. Water vapor, 7. Water tank, 8. Liquid level sensor, 11. Rotating shaft center, 12. Compressed air. DETAILED DESCRIPTION

[0024] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0025] Embodiment 1

[0026] In a typical implementation of the present invention, reference is made to Figure 1 As shown, a compressed air waste heat recovery system includes an air compressor 1, a box body 2, a steam turbine 3, a generator 4, a steam pipeline 5, a water tank 7, and a liquid level sensor 8.

[0027] Considering that the air compressor 1 in the air compressor unit will generate a large amount of heat in the process of generating compressed air 12, a box body is set outside the shell of the air compressor, the box body is sealed and connected to the shell of the air compressor, and the inside of the box body is filled with water, and the water covers the surrounding side of the shell of the air compressor.

[0028] The box body is provided with an opening at the top, and the box body is connected to a water tank through the opening, wherein the bottom of the water tank is connected to the box body top opening through a water outlet pipe, a liquid level sensor is provided on the inner wall of the box body, a switch valve is provided on the water outlet pipe, and the switch valve is electrically connected to the liquid level sensor.

[0029] By setting the liquid level sensor, the liquid level of the water in the box can be monitored. When the liquid level is lower than the set liquid level, the liquid level sensor sends a signal to the switch valve, and the switch valve opens to inject the water in the water tank 7 into the box, maintain the liquid level in the box 2 stable, ensure the water amount in the box, and prevent the air compressor 1 from boiling the water in the box 2.

[0030] The top of the box body 2 is also connected to the input end of the steam turbine 3 through a steam pipeline, and the output end of the steam turbine 3 is connected to the generator. The generator generates electricity for secondary use to drive the air compressor again.

[0031] The air compressor generates heat to boil water to generate water vapor 6, and the water vapor 6 enters the steam turbine through the steam pipeline 5 to drive the steam turbine to work. The water surrounding the air compressor takes away the working heat of the air compressor, and the generated water vapor drives the steam turbine to work. The steam turbine is connected to the generator to generate electricity. The generator returns the generated electricity to drive the air compressor again, thereby realizing direct utilization of the working heat of the air compressor and reducing waste heat.

[0032] The setting of the water tank and the liquid level sensor can automatically refill the water tank when the water level in the tank is lower than the set liquid level, thereby achieving continuous use of the system.

[0033] Embodiment 2

[0034] In a typical implementation of the present invention, reference is made to Figure 2 As shown, a compressed air waste heat recovery system includes an air compressor 1, a box body 2, a steam turbine 3, a steam pipeline 5, a water tank 7, and a liquid level sensor 8.

[0035] Taking into account that the air compressor 1 in the air compressor unit will generate a large amount of heat in the process of generating compressed air 12, a box body 2 is arranged outside the shell of the air compressor, the box body 2 is sealed and connected to the shell of the air compressor 1, and the inside of the box body 2 is filled with water, and the water covers the surrounding side of the shell of the air compressor 1.

[0036] Similar to the first embodiment, the top of the box body 2 is connected to the water tank 7 through an opening, and the bottom of the water tank 7 is connected to the top opening of the box body through a water outlet pipe. A liquid level sensor is provided on the inner wall of the box body 2, and a switch valve is provided on the water outlet pipe. The switch valve is electrically connected to the liquid level sensor.

[0037] The box body 2 is connected to the input end of the steam turbine 3 through the steam pipeline 5, and the output end of the steam turbine 3 is connected to the air compressor, wherein the rotation center of the output end of the steam turbine 3 is coaxially connected with the rotation shaft center of the air compressor 1, and the rotation center of the output end of the steam turbine 3 is connected to the rotation shaft center of the air compressor as a whole through a mechanical structure.

[0038] The heat generated by the air compressor 1 when working boils water to generate water vapor 6, and the water vapor 6 enters the steam turbine 3 through the steam pipeline 5 to drive the steam turbine 3 to work. The water surrounding the air compressor 1 takes away the working heat of the air compressor, and the generated water vapor drives the steam turbine 3 to work. The water vapor 6 directly drives the steam turbine to rotate. The rotation center of the output end of the steam turbine coincides with the rotation shaft center 11 of the air compressor 1, and they are connected as a whole through a mechanical structure to provide auxiliary power to the air compressor, save energy consumption of the air compressor, realize direct utilization of the working heat of the air compressor, and reduce waste of waste heat.

[0039] The way in which the rotation center of the output end of the turbine 3 of this embodiment is connected to the rotation shaft center 11 of the air compressor 1 through a mechanical structure is the prior art; the setting of the water tank 7 and the liquid level sensor 8 can automatically replenish the water tank when the water level in the box body 2 is lower than the set liquid level, thereby realizing the continuous use of the system.

[0040] In the utility model, through the setting of the first embodiment, the heat generated during the operation of the air compressor is used to heat the water in the box, and the generated water vapor drives the steam turbine to work, and then drives the generator to generate electricity. The electricity generated by the generator is directly returned for secondary use to drive the air compressor again; the setting of the second embodiment sets the steam turbine and the air compressor coaxially, and the steam turbine directly provides auxiliary power to the air compressor, saving the energy consumption of the air compressor. Both settings realize the effective utilization of the heat generated during the operation of the air compressor, reduce the waste of waste heat, and improve the energy utilization rate of the system. The waste heat utilization system of the utility model has a simple structure, low transformation cost, and sustainable use.

[0041] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A compressed air waste heat recovery system, characterized in that: It includes an air compressor, wherein a box is arranged outside a shell of the air compressor, the box is connected to a steam turbine through a steam pipeline, water is filled in the box, the water covers the periphery of the shell of the air compressor, the air compressor generates heat to boil the water to generate water vapor, the water vapor drives the steam turbine to work, the steam turbine directly drives the air compressor to work or drives the air compressor to work by generating electricity; The box body is sealed and connected to the shell of the air compressor; The box is connected to the steam turbine input end through a steam pipeline, and the steam turbine output end is connected to the air compressor; The rotation center of the steam turbine output end is coaxially connected with the rotation shaft center of the air compressor.

2. A compressed air waste heat recovery system according to claim 1, characterized in that: The box is connected to the input end of the steam turbine through a steam pipeline, and the output end of the steam turbine is connected to a generator. The generator generates electricity for secondary use to drive the air compressor again.

3. A compressed air waste heat recovery system according to claim 1, characterized in that: The rotation center of the steam turbine output end is connected to the rotation shaft center of the air compressor through a mechanical structure.

4. A compressed air waste heat recovery system according to claim 1, characterized in that: The box body is provided with an opening at the top, and is connected to a water tank through the opening.

5. A compressed air waste heat recovery system according to claim 4, characterized in that: The water tank is connected to the top opening of the tank body through a water outlet pipeline.

6. A compressed air waste heat recovery system according to claim 5, characterized in that: A liquid level sensor is arranged on the inner wall of the box body.

7. The compressed air waste heat recovery system according to claim 5, characterized in that: The water outlet pipeline is provided with a switch valve, which is electrically connected to the liquid level sensor.

Images