Method for cogeneration of methanol, CNG (compressed natural gas) and LNG (liquefied natural gas) from coke-oven gas and converter gas

A technology of converter gas and coke oven gas, which is applied in the field of methanol, CNG, and LNG preparation, can solve problems such as waste, achieve good process safety performance, and avoid the effect of pure oxygen conversion process

Active Publication Date: 2012-09-26
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coke oven gas after hydrogen extraction contains a large amount of CH 4 , return to the fuel pipe network as boiler fuel, which is obviously a waste

Method used

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  • Method for cogeneration of methanol, CNG (compressed natural gas) and LNG (liquefied natural gas) from coke-oven gas and converter gas
  • Method for cogeneration of methanol, CNG (compressed natural gas) and LNG (liquefied natural gas) from coke-oven gas and converter gas

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The joint production of coke oven gas and converter gas in this embodiment has an annual output of 100,000 tons of methanol and an annual output of 5668.161×10 4 N m 3 The CNG process is as follows:

[0029] Coke oven gas (dry basis) flow rate ~ 40000 Nm 3 / h, where H 2 : 55.65%, CH 4 : 25.67%, converter gas (dry basis) flow rate ~ 13000 Nm 3 / h, where CO: 60%, CO 2 : 16%.

[0030] Its process is as follows figure 1 shown.

[0031] Coke oven gas (wet basis) flow rate ~ 41700 Nm 3 / h, compressed to 2.1MPa by the coke oven gas compressor, enters the temperature swing adsorption pretreatment, the coke oven gas flow rate after pretreatment is ~40150 Nm 3 / h, synthetic exhaust gas flow ~ 6750 Nm 3 / h, the coke oven gas is mixed with the purge gas and enters the pressure swing adsorption hydrogen extraction process, and the proposed hydrogen flow rate is ~23200 Nm 3 / h, where H 2 : 98.0%, desorption gas flow ~ 23700 Nm 3 / h, where CH 4 : 43.3%, desorbed gas sen...

Embodiment 2

[0035] The joint production of coke oven gas and converter gas in this embodiment has an annual output of 100,000 tons of methanol and an annual output of 9010.176×10 4 N m 3 The LNG process is as follows:

[0036] Coke oven gas (dry basis) flow rate ~ 40000 Nm 3 / h, where H 2 : 55.65%, CH 4 : 25.67%, converter gas (dry basis) flow rate ~ 13000 Nm 3 / h, where CO: 60%, CO 2 : 16%.

[0037] Its process is as follows figure 2 shown.

[0038] Coke oven gas (wet basis) flow rate ~ 41700 Nm 3 / h, compressed to 2.1MPa by the coke oven gas compressor, enters the temperature swing adsorption pretreatment, the coke oven gas flow rate after pretreatment is ~40150 Nm 3 / h, synthetic exhaust gas flow ~ 6750 Nm 3 / h, the coke oven gas is mixed with the purge gas and enters the pressure swing adsorption hydrogen extraction process, and the proposed hydrogen flow rate is ~23200 Nm 3 / h, where H 2 : 98.0%, desorption gas flow ~ 23700 Nm 3 / h, where CH 4 : 43.3% sent to LNG proc...

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PUM

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Abstract

The invention discloses a method for cogeneration of methanol, CNG (compressed natural gas) and LNG (liquefied natural gas) from coke-oven gas and converter gas. The method mainly comprises the following steps: purifying hydrogen from coke-oven gas, mixing the hydrogen with purified converter gas to synthetize methanol, feeding relief gas for synthetizing methanol to mix with the coke-oven gas and then extracting hydrogen, removing CO2 (carbon dioxide) and sulfide through pressure swing adsorption from the stripping gas after purifying hydrogen after sulfur-tolerant shift conversion, then extracting CH4 (methane) through pressure swing adsorption to obtain SNG (synthetic natural gas), and compressing to obtain the CNG product, or removing acid gas from the stripping gas through an MDEA (methyldiethanolamine) process, carrying out cryogenic separation after drying and debenzolizing, and obtaining the LNG product after cryogenic separation.

Description

technical field [0001] The invention relates to the technical field of methanol, CNG and LNG preparation, in particular to a process method for preparing methanol, CNG and LNG by co-production of coke oven gas and converter gas. Background technique [0002] CNG, or Compressed Natural Gas (CNG for short), is natural gas that is pressurized and stored in a gaseous state in a container. In addition to the natural gas in oil fields and natural gas fields, compressed natural gas can also be used to artificially produce biogas (mainly composed of methane). [0003] LNG is liquefied natural gas. The main component is methane. LNG is colorless, odorless, non-toxic and non-corrosive, its volume is about 1 / 600 of the same volume of gaseous natural gas, the weight of LNG is only about 45% of the same volume of water, and its calorific value is 52MMBtu / t (1MMBtu=2.52 ×10 8 cal). [0004] The composition of compressed natural gas and pipeline natural gas is the same, the main compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/04C07C29/151C10L3/08C10L3/12
Inventor 王小勤蹇守华黄维柱周君
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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