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Methane gas recycling system and control method

A recovery system, methane gas technology, applied in the direction of refrigeration and liquefaction, liquefaction, solidification, etc., can solve the problem that the compressor cannot run safely and stably, and achieve the effect of preventing pressure from being suppressed

Active Publication Date: 2016-04-13
ENN SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For this reason, the technical problem to be solved by the present invention is to overcome the inability of the compressor to operate safely and stably when recovering methane in the prior art so as to provide a methane gas recovery system and recovery method that not only have a high recovery rate but also ensure the safe and stable operation of the compressor

Method used

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  • Methane gas recycling system and control method

Examples

Experimental program
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Embodiment 1

[0023] Such as figure 1 As shown, this embodiment provides a methane gas recovery system, the system includes a methane storage tank 11, the gas outlet of the methane storage tank 11 is connected to the inlet of the flasher 12 through a pipeline, and the flasher 12 The gas outlet of the gas is connected to the compression device 14 through the heat exchange device 13, and the heat exchange device 13 is connected to the return port of the flash evaporator 12 through a throttle valve 15, and the liquid outlet of the flash evaporator 12 is connected to the methane The air inlet of the storage tank 11 is connected, a pressure self-regulating valve 17 is provided between the methane storage tank 11 and the flash evaporator 12, and the inlet of the compression device 14 is provided with a pressure self-regulating valve 17 to control the pressure self-regulating valve 17 and the The first pressure interlock device 20 for opening and closing the compression device 14.

[0024] The ab...

Embodiment 2

[0035] This embodiment is a deformation on the basis of Embodiment 1, and the difference from Embodiment 1 is that the flash evaporator in the methane gas recovery system described in this embodiment is a flash evaporator with heat exchange, which will be described in detail below:

[0036] Such as figure 2 As shown, the flash evaporator with heat exchange includes a tank body 30, the tank body 30 is provided with a gas-liquid separation device 31 located at the bottom of the tank body and a heat exchange device 13 located at the top of the tank body, the heat exchange device 13 includes at least two passages, wherein the first passage communicates with the first air inlet on the tank body 30 for receiving gas, and the second passage communicates with the second air inlet on the tank body 30, wherein The second air inlet is connected to the compression device 14 through the first air outlet at the top of the tank body 30 , and a liquid outlet is provided at the bottom end of ...

Embodiment 3

[0041] This embodiment provides a methane gas recovery control method, using the methane gas recovery system described in any one of embodiment 1 or embodiment 2 to recover methane gas and collect methane liquid, the steps are as follows: step S1: the methane to be recovered The gas is collected and buffered, and when the collected methane gas reaches the first preset amount, enter step S2; when the collected methane gas is lower than the second preset amount, continue to collect methane gas until the methane gas reaches the first preset amount amount, enter step S2; step S2: after the heat exchange and temperature rise of the methane gas, enter the compression process to form high-pressure methane gas, and monitor the pressure of the methane gas at the compression inlet. 14 methane gas volume, when the pressure is lower than the pressure low value, increase the methane gas volume entering the compression device 14; step S3: heat exchange and cool down the high-pressure methane...

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PUM

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Abstract

The invention relates to a methane gas recycling system and control method. According to the system, interlocking control is set over starting and stopping of a compressing device, the pressure of a methane storage tank and the pressure and the temperature of an inlet of the compressing device; and meanwhile it is set that the throttling pressure of a throttle valve is higher than the pressure of the inlet of the compressing device, it is accordingly guaranteed that the compressing device works within the normal pressure range and the normal temperature range to prevent pressure building of the compressing device, and safe and stable running of the compressing device is guaranteed.

Description

technical field [0001] The invention relates to the technical field of gas recovery and reuse, in particular to the reliquefaction and recovery of boil-off gas (BOG) used in the storage and transportation of liquefied natural gas (LNG). Background technique [0002] The main component of liquefied natural gas (LNG) is methane. It is recognized as the cleanest energy source on earth. It is colorless, odorless, non-toxic and non-corrosive. Its volume is about 1 / 625 of the volume of the same amount of gaseous natural gas. The weight of LNG Only about 45% of the same volume of water. Liquefied natural gas is natural gas that becomes liquid after being compressed and cooled to its boiling point. Usually, liquefied natural gas is stored in a low-temperature storage tank at minus 161.5 degrees Celsius and about 0.1 MPa, transported by a special ship or tanker truck, and re-gasified when used. The burning of liquefied natural gas causes very little air pollution and releases a lot ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J1/02
CPCF25J1/0025F25J1/02F25J1/004F25J1/0257F25J1/0262F25J2205/02F25J2230/30F25J1/0244F25J1/0277F25J1/0202
Inventor 桂谢文陈峰
Owner ENN SCI & TECH DEV
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