Pressure stabilizing screw air compressor and waste heat recovery device thereof

Abstract

The utility model discloses a pressure stabilizing screw air compressor and a waste heat recovery device thereof. The pressure stabilizing screw air compressor comprises an air filter, an air inlet control valve, a motor, a screw air compressor, an oil-gas separator, a pressure stabilizing device, a gas waste heat recovery device, a liquid waste heat recovery device and a user side device. Therefore, the pressure stabilizing device is arranged to control the air quantity input into the screw air compressor, so that the air quantity achieves a stable effect, the problem that the abrasion loss of parts of an air compressor unit is increased due to frequent load increase and decrease caused by unstable air quantity is solved, and the service life of the air compressor is prolonged. In addition, by arranging a gas and liquid waste heat recovery device, heat of high-temperature gas and heat of high-temperature liquid are recycled, and therefore the recovery efficiency is improved.

Description

Technical Field

[0001] This utility model discloses a screw air compressor, and more particularly relates to a screw air compressor with a pressure stabilizing device and a waste heat recovery and reuse device. Background Technology

[0002] A screw air compressor is a device that converts mechanical energy into gas pressure energy. Its working principle is as follows: atmospheric pressure air passes through a filter and enters the screw air compressor chamber through the intake control valve. The motor drives the screw air compressor to operate, converting the incoming atmospheric pressure air into high-temperature, high-pressure air. To ensure the safe operation of the screw air compressor, low-temperature lubricating oil is injected during the compression process. Therefore, the gas output from the screw air compressor is an oil-gas mixture. This mixture is then separated into high-temperature gas and high-temperature lubricating oil by an oil-gas separator.

[0003] The pressure regulation of the intake control valve of the existing screw air compressor is directly controlled by the pressure difference between the user's operating pressure P2 and the output pressure P1. However, due to the large fluctuation range of the user's operating pressure P2, the pressure difference... Unstable pressure (P) leads to frequent adjustments of the intake control valve, causing frequent load changes in the screw air compressor, resulting in large current fluctuations. This increases wear on compressor components, reduces the compressor's lifespan, and ultimately affects stable operation at the user end. Directly or air-cooled high-temperature gas is introduced to the user end, increasing energy consumption. Directly or air-cooled high-temperature lubricating oil is recycled, causing the screw air compressor temperature to rise, increasing wear and reducing equipment lifespan. Furthermore, the heat from the high-temperature gas and lubricating oil is not fully utilized, resulting in resource waste. Utility Model Content

[0004] This utility model provides a pressure-stabilizing screw air compressor and other heat recovery devices, which solves the above-mentioned technical problems.

[0005] To achieve the above objectives, this utility model proposes the following solution: a pressure-stabilizing screw air compressor and a waste heat recovery device, comprising an air filter, an intake control valve, a motor, a screw air compressor, an oil-gas separator, a pressure regulating device, a pressure stabilizing device, a gas waste heat recovery device, a liquid waste heat recovery device, and a user-end device.

[0006] The air filter, the intake control valve, and the screw air compressor are connected by an intake pipe;

[0007] The motor drives the screw air compressor to operate;

[0008] The screw air compressor is connected to the oil-gas separator via an oil-gas delivery pipe;

[0009] The pressure stabilizing device includes a pressure controller, a pressure regulating device, a pressure detection device, and a pneumatic actuator, which are connected by a connecting cable; when the pressure difference... When P ≤ 0.4 MPa, the pressure regulating device maintains a stable pressure difference through fine-tuning; when the pressure difference... When P > 0.4 MPa, the pressure regulator converts the fluctuating pressure difference into a stable pressure difference;

[0010] The gas waste heat recovery device includes a gas pipeline and a gas heat recovery unit. The gas heat recovery unit is provided with a gas heat recovery unit inlet and a gas heat recovery unit outlet. The gas pipeline passes through the gas heat recovery unit and then enters the user terminal.

[0011] The liquid waste heat recovery device includes an oil pipeline, a liquid heat recovery unit, and a liquid collector. The liquid heat recovery unit is provided with a liquid heat recovery unit inlet and a liquid heat recovery unit outlet. The upper part of the liquid collector is provided with a multi-stage filter plate to filter impurities mixed in the lubricating oil. The lower part of the liquid collector is provided with a liquid outlet.

[0012] During operation, atmospheric pressure air passes through the air filter and enters the screw air compressor chamber via the intake control valve. The motor drives the screw air compressor, which requires the injection of low-temperature lubricating oil. The screw air compressor converts the incoming atmospheric pressure air into high-temperature, high-pressure gas. The high-temperature, high-pressure gas enters the oil-gas separator via the oil-gas delivery pipe, where it is separated into high-temperature gas and high-temperature lubricating oil. The high-temperature gas is fed to the user-end device after waste heat recovery via the gas waste heat recovery device, while the high-temperature lubricating oil is fed to the liquid collector after waste heat recovery via the liquid waste heat recovery device. The liquid collector is equipped with multi-stage filter plates to filter impurities in the lubricating oil, and the filtered lubricating oil can be collected and recycled. The pressure detection device is connected to the oil-gas delivery pipe and the gas delivery pipe via the connecting lines, detecting pressures P1 and P2 respectively. Due to the large fluctuation range of P2, a pressure difference is generated between P1 and P2 output by the pressure detection device. P represents the fluctuating pressure difference; when the pressure difference... When P ≤ 0.4 MPa, the pressure regulating device maintains a stable pressure difference through fine-tuning; when the pressure difference... When P > 0.4 MPa, the pressure regulator will be activated, which will convert the fluctuating pressure difference into a stable pressure difference. The stable pressure difference will drive the pneumatic actuator, which will control the intake control valve, so that the intake control valve will input constant atmospheric pressure air to the screw air compressor, thereby reducing the frequent load changes of the screw air compressor.

[0013] Furthermore, the pressure regulating device can be one or more of a self-operated pressure regulating valve, a pneumatic pressure regulating valve, an electric pressure regulating valve, etc., and the pressure difference can be stabilized by fine adjustment.

[0014] Furthermore, the gas transmission pipes are distributed in a U-shape, Z-shape, or spiral shape in the gas heat recovery unit;

[0015] Furthermore, the oil pipeline is distributed in a U-shape, Z-shape, or spiral shape in the liquid heat recovery unit;

[0016] Furthermore, the oil-gas separator can be configured as an oil-gas separation and recovery unit, which includes an oil-gas separation section and a waste heat recovery section. The gas pipeline and the oil pipeline are distributed within the waste heat recovery section. The waste heat recovery section is provided with a waste heat recovery inlet and a waste heat recovery outlet. High-temperature gas is input to the user-end device via the gas pipeline, and high-temperature liquid is input to the liquid collector via the oil pipeline.

[0017] The beneficial effects of this utility model are as follows:

[0018] 1. By setting up a pressure regulating device or pressure stabilizing device to stabilize the fluctuating pressure difference, the pneumatic actuator drives the intake control valve to input constant atmospheric pressure air into the screw air compressor, which reduces the frequent load increase and decrease of the screw air compressor, reduces the wear of air compressor unit parts, and extends the service life of the air compressor.

[0019] 2. By setting up gas heat recovery devices and liquid heat recovery devices, the heat of high-temperature gas and high-temperature lubricating oil separated and output by the oil-gas separator is recovered for power generation, heating or preheating of raw materials, etc.; the gas pipeline and oil pipeline are distributed in a U-shape in the recovery device, which increases the contact area with the coolant and improves the heat recovery efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the gas waste heat recovery structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the liquid waste heat recovery structure of this utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the oil-gas separator and recovery device of this utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the oil-gas separator and recovery device of this utility model;

[0025] In the diagram: 1-Air filter, 11-Inlet pipe, 2-Inlet control valve, 3-Motor, 4-Screw air compressor, 41-Oil-gas delivery pipe, 5-Oil-gas separator, 51-Oil-gas separation section, 52-Waste heat recovery section, 521-Waste heat recovery inlet, 522-Waste heat recovery outlet, 6-Pressure stabilizing device, 61-Pneumatic actuator, 62-Connecting line, 63-Pressure regulating device, 64-Pressure stabilizing controller, 65-Pressure detector 7-Gas waste heat recovery device, 71-Gas pipeline, 72-Gas heat recovery unit, 721-Gas heat recovery unit inlet, 722-Gas heat recovery unit outlet, 8-Liquid waste heat recovery device, 81-Oil pipeline, 82-Liquid heat recovery unit, 821-Liquid heat recovery unit inlet, 822-Liquid heat recovery unit outlet, 83-Liquid collector, 831-Multi-stage filter plate, 832-Liquid outlet, 9-User end device. Detailed Implementation

[0026] Example 1

[0027] This embodiment provides a pressure-stabilizing screw air compressor and a waste heat recovery device, including an air filter, an intake control valve, a motor, a screw air compressor, an oil-gas separator, a pressure stabilizing device, a gas waste heat recovery device, a user-end device, and a liquid collector.

[0028] During operation, atmospheric pressure air passes through the air filter and enters the screw air compressor cavity via the intake control valve. The screw air compressor injects lubricating oil and converts the incoming atmospheric pressure air into high-temperature, high-pressure gas. This high-temperature, high-pressure gas enters the oil-gas separator via the oil-gas delivery pipe, where it is separated into high-temperature gas and high-temperature lubricating oil. The high-temperature gas is then fed to the user-end device after waste heat recovery via the gas waste heat recovery device. The high-temperature lubricating oil enters the liquid collector via the oil delivery pipe. The liquid collector is equipped with a high-temperature resistant multi-stage filter plate to filter impurities in the lubricating oil. The filtered lubricating oil can be collected and recycled. The pressure detection device is connected to the oil-gas delivery pipe and the gas delivery pipe via connecting lines, detecting pressures P1 and P2 respectively. Due to the large fluctuation range of P2, a pressure difference is generated between the output pressures P1 and P2 from the pressure detection device. P (>0.4MPa) represents the fluctuating pressure difference; the pressure regulator will control the fluctuating pressure difference. P (>0.4MPa) is converted into a stable pressure difference, which drives the pneumatic actuator. The pneumatic actuator controls the intake control valve, so that the intake control valve inputs constant atmospheric pressure air to the screw air compressor, thereby reducing the frequent load changes of the screw air compressor.

[0029] The beneficial effects of this embodiment:

[0030] 1. By installing a pressure stabilizing device, the frequent load changes of the screw air compressor are reduced, thereby reducing wear on unit parts and extending the service life of the air compressor;

[0031] 2. By setting up a gas heat recovery device, the heat of the high-temperature gas output from the screw air compressor and the oil-gas separator is recovered, thereby improving the waste heat utilization efficiency.

[0032] Example 2

[0033] This embodiment provides a pressure-stabilized screw air compressor and a waste heat recovery device, including an air filter, an intake control valve, a motor, a screw air compressor, an oil-gas separator, a pressure stabilizing device, an air transmission pipe, a liquid waste heat recovery device, and a user-end device.

[0034] During operation, the oil-gas separator separates the high-temperature mixed gas into high-temperature gas and high-temperature lubricating oil. The high-temperature gas is input to the user-end device through the gas delivery pipe, and the high-temperature lubricating oil enters the liquid collector after the liquid waste heat recovery device recovers its waste heat. The liquid collector is equipped with multi-stage filter plates to filter impurities entrained in the lubricating oil. The filtered lubricating oil can be collected and recycled. The pressure detection device is connected to the oil-gas delivery pipe and the gas delivery pipe through the connecting lines, respectively, and detects pressures P1 and P2. Due to the large fluctuation range of P2, the pressure difference between P1 and P2 output by the pressure detection device is significant. P (≤0.4MPa) represents the fluctuating pressure difference; the pressure regulating device fine-tunes the fluctuating pressure difference. P (≤0.4MPa) is converted into a stable pressure difference, and the stable pressure difference drives the pneumatic actuator. The pneumatic actuator controls the air intake control valve to keep the amount of atmospheric pressure air input to the screw air compressor constant.

[0035] The beneficial effects of this embodiment:

[0036] 1. By setting up a pressure regulating device for fine-tuning, the frequent load increases and decreases of the screw air compressor can be reduced, thereby reducing wear on unit parts and extending the service life of the air compressor;

[0037] 2. By setting up a liquid heat recovery device, the heat of the high-temperature lubricating oil is recovered, and the filtered and collected lubricating oil is circulated and sprayed into the screw air compressor, which achieves the dual benefits of heat recovery and recycling.

[0038] Example 3

[0039] This embodiment provides a pressure-stabilized screw air compressor and a waste heat recovery device, including an air filter, an intake control valve, a motor, a screw air compressor, an oil-gas separator, a pressure stabilizing device, a gas waste heat recovery device, a liquid waste heat recovery device, and a user-end device. The oil-gas separator can be configured as an oil-gas separation and recovery unit, which includes an oil-gas separation section and a waste heat recovery section, such as... Figure 5 As shown.

[0040] High-temperature, high-pressure gas converted by the screw air compressor is input into the oil-gas separator and recovery unit through an oil-gas delivery pipe. In the oil-gas separation section, the oil-gas separator and recovery unit separates the high-temperature, high-pressure gas into high-temperature gas and high-temperature lubricating oil. The high-temperature gas is input into the waste heat recovery section through the gas delivery pipe for heat recovery, and then input into the user-end device. The high-temperature liquid is input into the waste heat recovery section through the oil delivery pipe for heat recovery, and then input into the liquid collector for collection and reuse. The gas delivery pipe and the oil delivery pipe are distributed in a U-shape, Z-shape, or spiral shape in the waste heat recovery section to increase the contact area and improve recovery efficiency. A pressure detection device is connected to the oil-gas delivery pipe and the gas delivery pipe respectively via connecting lines, detecting pressures P1 and P2 respectively. Due to the large fluctuation range of P2, the pressure difference between P1 and P2 output by the pressure detection device is a fluctuating pressure difference. After the pressure regulating device or pressure stabilizing control device stabilizes the pressure difference, it drives the pneumatic actuator to work. The pneumatic actuator controls the intake control valve to keep the amount of atmospheric pressure air input to the screw air compressor constant.

[0041] The beneficial effects of this embodiment:

[0042] 1. By setting up a pressure regulating device or pressure stabilizing device to stabilize the fluctuating pressure difference, the pneumatic actuator drives the intake control valve to input constant atmospheric pressure air into the screw air compressor, which reduces the frequent load increase and decrease of the screw air compressor, reduces the wear of air compressor unit parts, and extends the service life of the air compressor.

[0043] 2. By performing separation and waste heat recovery in the oil-gas separator, the equipment space is effectively utilized, the layout of the recovery device is simplified, and the U-shaped, Z-shaped or spiral distribution increases the contact area, which also improves the heat recovery efficiency.

[0044] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the present invention, or modify it into equivalent embodiments, based on the disclosed technical content, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, should fall within the protection scope of the present invention.

Claims

1. A pressure-stabilizing screw air compressor and a residual heat recovery device, characterized in that: The pressure-stabilizing screw air compressor and waste heat recovery device include an air filter, an intake control valve, a motor, a screw air compressor, an oil-gas separator, a pressure stabilizing device, a gas waste heat recovery device, a liquid waste heat recovery device, and a user-end device; the screw air compressor is connected to the oil-gas separator via an oil-gas delivery pipe; the pressure stabilizing device includes a pressure regulating device, a pressure stabilizing controller, a pressure detection device, and a pneumatic actuator, which are connected by a connecting cable; the gas waste heat recovery... The gas recovery device includes a gas pipeline and a gas heat recovery unit. The gas heat recovery unit is provided with a gas heat recovery unit inlet and a gas heat recovery unit outlet. The gas pipeline passes through the gas heat recovery unit and then enters the user terminal. The liquid waste heat recovery device includes an oil pipeline, a liquid heat recovery unit, and a liquid collector. The liquid heat recovery unit is provided with a liquid heat recovery unit inlet and a liquid heat recovery unit outlet. The upper part of the liquid collector is provided with a multi-stage filter plate to filter impurities mixed in the lubricating oil. The lower part of the liquid collector is provided with a liquid outlet.

2. The pressure-stabilizing screw air compressor and the remaining heat recovery device according to claim 1, characterized in that: The pressure detection device is connected to the oil and gas transmission pipe and the gas transmission pipe respectively via the connecting line, and detects P1 and P2 respectively; the pressure detection device outputs the pressure difference between P1 and P2. P; when the pressure difference When P ≤ 0.4 MPa, the pressure regulating device maintains a stable pressure difference through fine-tuning; when the pressure difference... When P > 0.4 MPa, the pressure regulator converts the fluctuating pressure difference into a stable pressure difference; the stable pressure difference drives the pneumatic actuator, which controls the intake control valve to input constant atmospheric pressure air into the screw air compressor.

3. The pressure-stabilizing screw air compressor and other heat recovery device according to claim 2, characterized in that: The air filter, the intake control valve, and the screw air compressor are connected via an intake pipe.

4. The pressure-stabilizing screw air compressor and the remaining heat recovery device according to claim 2, characterized in that: The motor drives the screw air compressor to operate.

5. The pressure-stabilizing screw air compressor and the remaining heat recovery device according to claim 2, characterized in that: The pressure regulating device is one or more of a self-operated pressure regulating valve, a pneumatic pressure regulating valve, and an electric pressure regulating valve.

6. The pressure-stabilizing screw air compressor and other heat recovery device according to claim 1, characterized in that: The oil-gas separator is configured as an oil-gas separation and recovery unit, which includes an oil-gas separation section and a waste heat recovery section. The gas pipeline and the oil pipeline are distributed in the waste heat recovery section. The waste heat recovery section is provided with a waste heat recovery inlet and a waste heat recovery outlet. High-temperature gas is input to the user-end device through the gas pipeline, and high-temperature liquid is input to the liquid collector through the oil pipeline.

7. The pressure-stabilizing screw air compressor and other heat recovery devices according to any one of claims 1-6, characterized in that: The gas pipelines are distributed in a U-shape, Z-shape, or spiral shape in the gas heat recovery unit.

8. The pressure-stabilizing screw air compressor and other heat recovery devices according to any one of claims 1-6, characterized in that: The oil pipelines are distributed in a U-shape, Z-shape, or spiral shape in the liquid heat recovery unit.

9. The pressure-stabilizing screw air compressor and other heat recovery devices according to any one of claims 1-6, characterized in that: The multi-stage filter plate installed inside the liquid collector is made of a high-temperature resistant material.

10. The pressure-stabilizing screw air compressor and other heat recovery device according to claim 6, characterized in that: The liquid that absorbs heat in the gas waste heat recovery device, the liquid waste heat recovery device, and the waste heat recovery section is one of water, ethylene glycol solution, heat transfer oil, molten salt, or ammonia.

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