Energy recovery device for hydrogen-doped station

Abstract

The utility model discloses a hydrogen-doped station energy recovery device which comprises a hydrogen expansion machine, a motor and a natural gas compressor, the two ends of the natural gas compressor are connected with the motor and the hydrogen expansion machine respectively, and the hydrogen expansion machine is connected with a natural gas supercharger through a variable speed clutch and the motor. A gas inlet pipe of the natural gas compressor is connected with a natural gas main pipeline, and a gas outlet pipe of the natural gas compressor is connected to a natural gas inlet of the gas mixing device after passing through the heat exchange device; incoming hydrogen passes through the heat exchange device and then is connected to a gas inlet of the hydrogen expansion machine, and a gas outlet of the expansion machine is connected to a hydrogen inlet of the gas mixing device. Before hydrogen enters the natural gas mixing device, the pressure energy of the hydrogen can drive the expansion machine to rotate, and the pressure energy of the hydrogen is recycled. In order to reduce hydrogen liquefaction caused by Joule-Thompson effect in the expansion process, waste heat of a compressor is adopted to heat hydrogen at an inlet of an expansion machine through a heat exchange device.

Description

Technical Field

[0001] The utility model relates to the technical field of gas hydrogen blending transportation and power generation, in particular to an energy recovery device for a hydrogen blending station. Background Art

[0002] In the northern region, the natural gas source pressure is relatively low, and it is usually necessary to pressurize the gas source to meet the intake pressure requirements of a 9H hydrogen-blended gas turbine. Since hydrogen has a small density, in order to reduce transportation costs, it is usually transported and stored at ultra-high pressure, and is mixed with natural gas through decompression for use by the gas turbine during utilization. During the processes of natural gas pressurization and hydrogen pressure regulation and decompression, large thermal and energy losses will occur. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to improve the energy utilization efficiency of a natural gas hydrogen blending station. To solve the above problem, an energy recovery device for a hydrogen blending station is provided.

[0004] The purpose of the utility model is achieved in the following way:

[0005] An energy recovery device for a hydrogen blending station includes a hydrogen expander, a motor, a natural gas compressor, a variable speed clutch, a heat exchange device and a gas mixing device. The two ends of the natural gas compressor are respectively connected to the motor and the hydrogen expander, and the hydrogen expander and the natural gas compressor are connected to the motor through a variable speed clutch; the intake pipe of the natural gas compressor is connected to the natural gas main pipeline, and the outlet pipe of the natural gas compressor is connected to the natural gas inlet of the gas mixing device after passing through the heat exchange device; the hydrogen incoming gas is connected to the intake port of the hydrogen expander after passing through the heat exchange device, and the outlet port of the hydrogen expander is connected to the hydrogen inlet of the gas mixing device.

[0006] The motor is a synchronous motor.

[0007] The heat exchange device adopts a shell and tube heat exchanger.

[0008] The beneficial effects of the utility model: Before hydrogen enters the natural gas mixing device, the hydrogen pressure energy drives the expander to rotate, and the hydrogen pressure energy is recovered. The hydrogen expander and the natural gas compressor are connected through a clutch. During the hydrogen blending process, the clutch engages, and the expander and the compressor achieve coaxial movement. The expander and the motor jointly drive the natural gas booster to operate; when hydrogen blending is not required, the clutch disengages, and the motor alone drives the natural gas booster to operate, without affecting the normal operation of the gas turbine. In order to reduce the liquefaction of hydrogen caused by the Joule-Thomson effect during the expansion process, the waste heat of the compressor is used to heat the hydrogen at the inlet of the expander through the heat exchange device. Description of the Drawings

[0009] Figure 1It is a structural schematic diagram of the present utility model.

[0010] Among them, 1 is a hydrogen expander, 2 is a variable speed clutch, 3 is a natural gas compressor, 4 is an electric motor, 5 is a heat exchange device, and 6 is a gas mixing device. Specific embodiments

[0011] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0012] It should be noted that the following detailed description is exemplary and is intended to provide further description of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same technical meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0013] A hydrogen-doped station energy recovery device includes a hydrogen expander 1, an electric motor 4, a natural gas compressor 3, a variable speed clutch 2, a heat exchange device 5, and a gas mixing device 6. The two ends of the natural gas compressor 3 are respectively connected to the electric motor 4 and the hydrogen expander 1. The hydrogen expander 1 and the natural gas compressor 3 are connected to the electric motor 4 through the variable speed clutch 2. The intake pipe of the natural gas compressor 3 is connected to the natural gas main pipeline, and the outlet pipe of the natural gas compressor 3 is connected to the natural gas inlet of the gas mixing device 6 after passing through the heat exchange device 5. The hydrogen incoming gas is connected to the intake port of the hydrogen expander 1 after passing through the heat exchange device 5, and the outlet port of the hydrogen expander 1 is connected to the hydrogen inlet of the gas mixing device 6.

[0014] The electric motor is a synchronous motor.

[0015] The heat exchange device adopts a shell-and-tube heat exchanger.

[0016] In this embodiment, the hydrogen expander 1 is driven to operate by high-pressure hydrogen. The hydrogen flowing out after the pressure reduction in the hydrogen expander 1 is mixed with the natural gas pressurized by the natural gas compressor 3 in the gas mixing device 6 and then supplied to the combustion engine for use. Since the expansion in the hydrogen expander 1 will cause the temperature of the hydrogen to drop, the heat exchange device 5 is provided to preheat the hydrogen at the intake port of the hydrogen expander using the waste heat of the natural gas at the outlet of the natural gas compressor.

[0017] The layout of the hydrogen expander and the natural gas compressor can be as Figure 1 shown. During the hydrogen doping process, the variable speed clutch 2 is engaged, and the hydrogen expander 1 and the electric motor 4 jointly drive the natural gas compressor 3 to pressurize the natural gas. The expander expands and does work, reducing the output of the electric motor. When hydrogen doping is not required, the variable speed clutch 2 disengages, and the electric motor 4 alone drives the natural gas compressor 3 to pressurize and provide gas for the combustion engine.

[0018] In the present utility model, before hydrogen enters the natural gas mixing device, the hydrogen pressure can drive the expander to rotate for recovering the hydrogen pressure energy. The hydrogen expander is connected to the natural gas compressor through a clutch. During the hydrogen blending process, the clutch engages, and the expander and the compressor achieve coaxial movement. The expander and the motor jointly drive the natural gas booster to operate. When hydrogen blending is not required, the clutch disengages, and the motor drives the natural gas booster to operate alone without affecting the normal operation of the gas turbine. In order to reduce the liquefaction of hydrogen caused by the Joule-Thomson effect during the expansion process, the waste heat of the compressor is used to heat the hydrogen at the inlet of the expander through a heat exchange device.

[0019] The above are only the preferred embodiments of the present utility model. It should be pointed out that for those skilled in the art, without departing from the overall concept of the present utility model, several changes and improvements can still be made, and these should also be regarded as the protection scope of the present utility model.

Claims

1. A hydrogen mixing station energy recovery device, characterized in that: The invention comprises a hydrogen expander (1), a motor (4), a natural gas compressor (3), a speed-changing clutch (2), a heat exchange device (5) and a gas mixing device (6), wherein two ends of the natural gas compressor (3) are respectively connected to the motor (4) and the hydrogen expander (1), and the hydrogen expander (1) and the natural gas compressor (3) are connected to the motor (4) via the speed-changing clutch (2); the air inlet pipe of the natural gas compressor (3) is connected to the natural gas main line, and the air outlet pipe of the natural gas compressor (3) is connected to the natural gas inlet of the gas mixing device (6) after passing through the heat exchange device (5); the hydrogen gas is connected to the air inlet of the hydrogen expander (1) after passing through the heat exchange device (5), and the air outlet of the hydrogen expander (1) is connected to the hydrogen inlet of the gas mixing device.

2. The hydrogen mixing station energy recovery device according to claim 1, characterized in that: The motor is a synchronous motor.

3. The hydrogen mixing station energy recovery device according to claim 1, characterized in that: The heat exchange device adopts a shell and tube heat exchanger.

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