Totally-closed low-grade waste heat recovery power generation recycling system

Abstract

The utility model relates to a totally-closed low-grade waste heat recovery power generation recycling system which comprises a cold compressor, a first heat exchanger, a buffer tank, a turbine, an induced draft fan and a second heat exchanger through which a medium passes in sequence, and a low-grade heat source which exchanges heat with the medium flows in the second heat exchanger. When the device is used, a low-grade heat source enters the second heat exchanger, a medium absorbs heat of the low-grade heat source, then enters the cold compressor and is compressed to form a high-temperature and high-pressure medium, the medium transmits the heat to heat-carrying fluid in the first heat exchanger to form a high-pressure and low-temperature medium, and the medium enters the buffer tank to be stored. When the pressure of the medium reaches a set value of the constant-pressure valve, the constant-pressure valve is opened, the medium pushes the impeller to rotate and drives the rotating shaft of the generator to rotate for power generation, the medium after power generation is low-pressure and low-temperature and is fed into the second heat exchanger under the action of the induced draft fan to form circulation, and the system fully absorbs and utilizes heat of a low-grade heat source, so that heat pollution can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical field especially relates to mechanical component technical field, concretely refers to a kind of full-closed low-grade waste heat recovery power generation recycling system. BACKGROUND

[0002] In the production process of enterprise, many hot fluids between 40-60 DEG C, including water and gas, are discharged, not only causing energy waste (especially existing heat power generation enterprise), but also polluting the environment, that is, heat pollution, therefore, a low-grade heat recovery device is urgently needed, and the difficulty of low-grade waste heat recovery lies in recycling, and the present technology designs a kind of full-closed impeller machine, which is used for waste heat recovery power generation, to solve the difficulty of low-grade waste heat recovery. SUMMARY

[0003] The utility model provides a kind of full-closed low-grade waste heat recovery power generation recycling system for recovering low-grade heat for the deficiency of prior art.

[0004] The utility model is realized through the following technical schemes, a kind of full-closed low-grade waste heat recovery power generation recycling system, including the medium of cold compressor, first heat exchanger, buffer tank, impeller machine, induced draft fan, second heat exchanger in turn, the medium import of cold compressor is communicated with the medium export of second heat exchanger, the constant pressure valve that the medium passes through is also equipped between the buffer tank and impeller machine, low-grade heat source that the medium exchanges heat flows in the second heat exchanger, the rotating shaft of the impeller machine is connected with the rotating shaft of generator.

[0005] The utility model when using, low-grade heat source enters into second heat exchanger, exchanges heat with medium, so that medium absorbs the heat of low-grade heat source, then enters into cold compressor, is compressed to form high-temperature high-pressure medium, high-temperature high-pressure medium is transferred to heat carrier fluid in first heat exchanger, forms high-pressure low-temperature medium, subsequently enters into buffer tank and is stored, when the medium pressure in buffer tank reaches the set value of constant pressure valve, constant pressure valve opens, medium enters into impeller machine through constant pressure valve, drives impeller to rotate, impeller rotation drives generator rotating shaft to rotate and generates electricity, the medium after power generation is low-pressure low-temperature medium, under the action of induced draft fan, is sent into second heat exchanger, enters next cycle, to utilize the heat of low-grade heat source fully, achieves the purpose of waste heat recovery.

[0006] As preferred, generator is connected with electric energy storage continuous heating equipment through controller, fluid heating pipeline is equipped in the electric energy storage continuous heating equipment, the first heat exchanger heat carrier fluid outlet is connected with the fluid heating pipeline, the fluid outlet of electric energy storage continuous heating equipment is connected with industrial equipment, and the fluid outlet of industrial equipment is communicated with the fluid import of first heat exchanger through fluid pipeline.

[0007] In use, the electricity generated by the generator is transmitted to the electric energy storage continuous heating device through the controller, and the electric energy is converted into heat energy in the electric energy storage continuous heating device. The annular electrically conductive wire heating device is used to heat the thermal molten salt energy storage material, which absorbs and stores the heat, forming a constant temperature heat source. The heat exchange between the high-temperature and high-pressure medium and the heat carrier fluid in the first heat exchanger is exchanged with the thermal molten salt energy storage material, and the heat carrier fluid is transmitted to the industrial equipment for use. After being used by the industrial equipment, the heat carrier fluid returns to the first heat exchanger for recycling and heat exchange, thereby forming a second closed system. The system is recycled through heat exchange and power generation, which greatly improves the COP of the compressor.

[0008] As a preferred embodiment, the generator is provided with two generators, and the rotating shafts of the two generators are respectively connected to the two ends of the impeller rotating shaft. The two generators are provided to maintain the balance of the impeller.

[0009] As a preferred embodiment, the impeller machine comprises an impeller shaft connected to the volute, and the inlet of the volute extends along the tangential direction of the impeller.

[0010] The medium vertically impacts one side of the V groove of the impeller along the tangential direction through the volute inlet and the impeller, which reduces the decomposition of the medium thrust, increases the thrust moment, and improves the power generation efficiency.

[0011] As a preferred embodiment, the V groove on the impeller is uniformly arranged in the circumferential direction, and the side of the V groove impacted by the medium is on the diameter of the impeller, and the V groove is symmetrically arranged with respect to the impeller rotating shaft.

[0012] As a preferred embodiment, the impeller further comprises a weight-reducing hole located between the V groove and the impeller rotating shaft. The weight-reducing hole is provided to reduce the weight of the impeller, thereby reducing the inertia of the impeller.

[0013] The utility model discloses beneficial effect is: low grade heat source enters to the second heat exchanger, and exchanges heat with medium, and medium absorbs the heat of low grade heat source, then enters to cold compressor, forms high temperature high pressure medium after compression, high temperature high pressure medium gives the heat to heat carrier fluid in the first heat exchanger, forms high pressure low temperature medium, then enters the storage in buffer tank, when the medium pressure in buffer tank reaches the setting value of constant pressure valve, enters the impeller machine through constant pressure valve, drives the rotation of impeller, and the rotation of impeller drives the rotation of generator shaft and generates electricity, and the medium after power generation becomes low pressure low temperature medium, and this medium is sent into the second heat exchanger under the action of induced draft fan, forms a cycle, reaches the low grade waste heat recovery purpose, and reduces thermal pollution;The electricity generated by generator is sent to electric energy storage continuous heating equipment through controller, and the electric energy is converted into heat energy in electric heating equipment, and is absorbed and stored by hot melt salt energy storage material, forms constant temperature heat source, and the heat carrier fluid that exchanges heat with high temperature high pressure medium in the first heat exchanger exchanges heat with hot melt salt energy storage material and is sent to industrial equipment use, after using through industrial equipment, the heat carrier fluid returns to the first heat exchanger again and carries out cyclic heat exchange, thereby forming the second closed system, the medium of the system is recycled after heat exchange and power generation, and the COP of compressor is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is structure schematic view of the utility model;

[0015] Figure 2 It is medium flow schematic view;

[0016] Figure 3 It is current flow schematic view;

[0017] Figure 4 It is heat carrier fluid flow schematic view;

[0018] Figure 5 It is impeller machine main view schematic view;

[0019] Figure 6 It is impeller machine side view schematic view;

[0020] Figure 7 It is impeller schematic view;

[0021] In the drawing:

[0022] 1, volute, 2, impeller, 3, impeller shaft, 4, the feed inlet of impeller machine, 5, the discharge port of impeller machine, 6, the base of impeller machine, 7, buffer bin, 11, compressor, 12, first heat exchanger, 13, impeller machine, 14, low grade heat source, 15, generator, 16, induced draft fan, 17, second heat exchanger, 18, electric energy storage continuous heating equipment, 19, controller, 20, buffer tank, 21, constant pressure valve. DETAILED DESCRIPTION

[0023] In order to clearly illustrate the technical features of the scheme, the scheme will be described below through specific embodiments.

[0024] Referring to the accompanying Figures 1-7 The utility model discloses a kind of fully-enclosed low-grade waste heat recovery power generation recycling systems, including medium sequentially through cold compressor 11, first heat exchanger 12, buffer tank 20, impeller machine 13, induced draft fan 16, second heat exchanger 17, the medium outlet of second heat exchanger 17 is communicated with the medium import of cold compressor 11, the buffer tank 20 and impeller machine 13 between also be equipped with the constant pressure valve 21 that medium passes, low-grade heat source that second heat exchanger 17 flows has heat exchange with the medium.

[0025] The rotating shaft of impeller machine 13 is connected with the rotating shaft of generator, and the generator is provided with two rotating shafts, and the rotating shafts of the two generators are respectively connected to the two ends of the impeller rotating shaft 3.

[0026] The electricity generated by the generator is transmitted to the electric energy storage continuous heating device 18 through the controller 19, and the electric energy storage continuous heating device is provided with a fluid heating pipeline, the fluid outlet of the first heat exchanger 12 is connected with the fluid heating pipeline in the electric energy storage continuous heating device 18, and the fluid outlet of the electric energy storage continuous heating device 18 is connected with the industrial equipment, and the fluid outlet of the industrial equipment is communicated with the fluid inlet of the first heat exchanger 12 through a fluid pipeline.

[0027] The electric energy storage continuous heating device is the prior art of the applicant, and the outer pipe of the electric energy storage continuous heating device is provided with a thermal molten salt energy storage material between the outer pipe and the fluid heating pipeline, and the outer pipe is wound with an annular electric lead wire, and the annular electric lead wire is connected with the controller.

[0028] The impeller machine 13 comprises an impeller shaft connected in the volute 1, and the gap between the impeller and the volute is very small, so that the high-pressure medium does not enter the buffer bin 7 through the gap to do work, and the feed inlet of the volute 1 extends along the tangent direction of the impeller, and the buffer bin 7 is arranged below the impeller in the volute 1, and the buffer bin 7 is provided with a medium outlet.

[0029] The V-grooves on the impeller are uniformly arranged along the circumference, the surface of the V-grooves impacted by the medium is on the diameter of the impeller, and the V-grooves are symmetrically arranged with respect to the impeller rotating shaft 3, and the impeller is further provided with a weight-reducing hole between the V-groove and the impeller rotating shaft 3.

[0030] The first heat exchanger and the second heat exchanger are both prior art, and the first heat exchanger and the second heat exchanger both comprise a tube pass and a shell pass for heat exchange, the compressor 11 is prior art, and the controller 19 is designed according to the system process and the performance of the thermal molten salt.

[0031] The low-grade heat source 14 enters the second heat exchanger and exchanges heat with the medium, so that the medium absorbs the heat of the low-grade heat source 14, and then enters the cold compressor 11 to form high-temperature and high-pressure medium, the high-temperature and high-pressure medium transmits heat to the heat carrier fluid in the first heat exchanger 12 to form high-pressure and low-temperature medium, and then enters the buffer tank 20 for storage, when the medium pressure in the buffer tank 20 reaches the set value of the constant pressure valve 21, the constant pressure valve is opened, the medium enters the impeller machine 13 through the constant pressure valve 21 to drive the impeller to rotate, the rotation of the impeller drives the generator shaft to rotate to generate electricity, and the medium after electricity generation is low-pressure and low-temperature medium, which is sent into the second heat exchanger to absorb the heat of the low-grade heat source under the action of the induced draft fan, and forms a cycle, so that the heat pollution can be reduced.

[0032] The electricity generated by the generator is transmitted to the electric energy storage continuous heating equipment 18 through the controller 19, the electric energy is converted into heat energy in the electric heating equipment, and is absorbed and stored by the molten salt energy storage material to form a constant temperature heat source, the heat carrier fluid in the first heat exchanger 12 exchanges heat with the high-temperature and high-pressure medium, and the temperature of the heat carrier fluid is increased to the industrial heat utilization requirement after heat exchange with the molten salt energy storage material, and is transmitted to the industrial equipment for use, and the heat carrier fluid is returned to the first heat exchanger 12 again for cyclic heat exchange after use of the industrial equipment, so as to form a second closed system, the system is recycled through heat exchange and electricity generation and energy storage, and the COP of the compressor 11 is greatly improved.

[0033] Of course, the above description is not limited to the above examples, and the technical features not described in the utility model can be realized by or using the prior art, which will not be repeated here; the above embodiments and drawings are only used to illustrate the technical scheme of the utility model and are not limited to the utility model, the preferred embodiments of the utility model are described in detail, and those skilled in the art should understand that the changes, modifications, additions or replacements made by those skilled in the art within the essential scope of the utility model do not deviate from the purpose of the utility model, and should also belong to the protection scope of the claims of the utility model.

Claims

1. A totally enclosed low-grade waste heat recovery power generation recycling system, characterized by: The cold compressor (11), the first heat exchanger (12), the buffer tank (20), the impeller machine (13), the air blower (16) and the second heat exchanger (17) are sequentially arranged in the medium flow path, the medium outlet of the second heat exchanger (17) is communicated with the medium inlet of the cold compressor (11), a constant pressure valve (21) is arranged between the buffer tank (20) and the impeller machine (13), the second heat exchanger (17) is provided with a low-grade heat source for heat exchange with the medium, and the rotating shaft of the impeller machine (13) is connected with the rotating shaft of the generator.

2. The totally enclosed low-grade waste heat recovery power generation recycling system according to claim 1, characterized in that: The generator is connected with the electric energy storage continuous heating device (18) through the controller (19), the electric energy storage continuous heating device (18) is provided with a fluid heating pipeline, the heat carrier fluid outlet of the first heat exchanger (12) is connected with the fluid heating pipeline, the fluid outlet of the electric energy storage continuous heating device (18) is connected with the industrial equipment, and the fluid outlet of the industrial equipment is communicated with the fluid inlet of the first heat exchanger (12) through the fluid pipeline.

3. The totally enclosed low-grade waste heat recovery power generation recycling system according to claim 1, characterized in that: The generator is provided with two generators, and the rotating shafts of the two generators are respectively connected with the two ends of the impeller rotating shaft (3).

4. The totally enclosed low-grade waste heat recovery power generation recycling system of claim 1, wherein: The impeller machine (13) comprises an impeller shaft connected in the volute (1), and the feeding port of the volute (1) extends along the tangential direction of the turbine.

5. The totally enclosed low-grade waste heat recovery power generation recycling system according to claim 4, characterized in that: The V grooves on the impeller are uniformly arranged in the circumferential direction, and the side of the V groove impacted by the medium is on the diameter of the impeller, and the V groove is symmetrically arranged with the impeller rotating shaft.

6. The totally enclosed low-grade waste heat recovery power generation recycling system according to claim 5, characterized in that: The impeller is further provided with a weight-reducing hole between the V groove and the impeller rotating shaft (3).

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