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Methanation method and device for preparation of synthetic natural gas

A synthetic natural gas and methanation technology, applied in the field of chemical engineering, can solve the problems of long process flow, many equipment, high energy consumption, etc., and achieve the effects of streamlining the process, improving energy efficiency and saving investment

Active Publication Date: 2015-07-29
杭州林达化工技术工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the process is long, the equipment is large, the investment is large, and the energy consumption is high.

Method used

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  • Methanation method and device for preparation of synthetic natural gas
  • Methanation method and device for preparation of synthetic natural gas
  • Methanation method and device for preparation of synthetic natural gas

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Experimental program
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Effect test

Embodiment 1

[0043] Such as Figure 4The shown basic methanation device for producing synthetic natural gas includes a first-stage methanation reactor 1, a circulation compressor 2, a second-stage methanation reactor 3, a water cooler 11, and a first water separator 6 connected in sequence. The first-stage methanation reactor 1 is externally connected with a steam drum 4 to by-produce steam, the first-stage methanation reactor 1 is a coiled tube heat exchange reactor, and the second-stage methanation reactor 3 is an adiabatic reactor.

[0044] In this embodiment, the synthesis pressure of the first-stage methanation is 3-6 MPa, the synthesis pressure of the second-stage methanation is 10 MPa, and the pressure of the second-stage methanation reactor 3 is higher than that of the first-stage methanation reactor 1 .

[0045] When the above-mentioned device is in operation, the purified feed gas is first subjected to the pressure of coal gasification and purification pressure level (for example,...

Embodiment 2

[0047] Such as Figure 5 The shown methanation device for producing synthetic natural gas includes a first-stage methanation reactor 1, a second-stage methanation reactor 3, a first heat exchanger 8, a second heat exchanger 9, a water cooler 11, and a cycler 13 And the first water separator 6, the one-stage methanation reactor 1, the second-stage methanation reactor 3, the first heat exchanger 8, the second heat exchanger 9, the water cooler 11, the first water separator 6 , the circulator 13 are connected in sequence, and the outlet of the circulator 13 is connected with the second heat exchanger 9 and the inlet of the first-stage methanation reactor 1 in sequence.

[0048] When the above-mentioned device is in operation, the purified raw material gas is heated to 250-300°C through the first heat exchanger 8 and the reaction gas, and then the raw material gas is divided into two streams, and one raw material gas enters the first-stage methanation reactor 1. React at 400°C, t...

Embodiment 3

[0049] Such as Figure 6 The shown device, the device comprises a purifier 5, a first-stage methanation reactor 1, a second-stage methanation reactor 3, a first heat exchanger 8, a second heat exchanger 9, a third heat exchanger 10, The water cooler 11, the first water separator 6, the second water separator 7, the steam generator 14, the first section of the methanation reactor 1, the first heat exchanger 8, the first water separator 6, and the circulation section and the circulation compressor 2, the second heat exchanger 9, and the second-stage methanation reactor 3 composed of the compression section, and the outlet of the second-stage methanation reactor 3 exchanges heat with the second heat exchanger 9 and the third Device 10, water cooler 11, and the second water separator 7 are connected sequentially, wherein the outlet pipeline of the compression section of the circulating compressor 2 is connected with the second heat exchanger 9, and then connected with the inlet of...

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Abstract

The invention discloses a methanation method and device for preparation of synthetic natural gas. The method comprises that raw material gas subjected to catalyst poison purification removal enters into a first methanation reactor and undergoes a methanation reaction with most of H2 and CO, and the reaction gas enters into a second methanation reactor and undergoes a methanation reaction with the rest of H2 and CO so that dry gas subjected to methanation has CH4 content greater than 93% and a calorific value greater than 33MJ / M<3>. The invention also discloses a device for implementation of the method. The high-efficiency energy-saving compact large-scale natural gas methanation preparation technology and device are especially suitable for the conditions that many ammonia synthesis factories need coal gasification and purification low pressure apparatuses and ammonia synthesis middle / high pressure apparatuses. Middle and small scale ammonia synthesis factory high-pressure compressor and high-pressure synthesis device in China can be transformed into an artificial natural gas synthesis device so that a large amount of investment is saved. The technology and device have important effects.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a methanation method and device for producing synthetic natural gas. Background technique [0002] At present, the coal-to-natural gas process in foreign countries first produces syngas by coal gasification, and then converts CO into gas to obtain synthetic gas, and then methanize the raw synthetic gas to make natural gas. The key technology for methanation is high-temperature adiabatic methanation, such as TREMP of Topsφe Company TM Technology (Zhu Ruichun et al., "Research on Coal-to-Synthetic Natural Gas Technology", "Clean Coal Technology", Vol. 17, No. 6, 2011, P81-85) Figure 4 , using five high-temperature adiabatic reactors in series to react, and other methanation technologies such as Lurgi and DAVY are similar. Therefore, the process is long, the equipment is large, the investment is large, and the energy consumption is high. [0003] Currently used with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08
Inventor 楼韧楼寿林
Owner 杭州林达化工技术工程有限公司
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