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A method and device for producing natural gas from low-hydrogen carbon bilan coke tail gas

A technology of semi-coke tail gas and low hydrogen carbon, which is applied in the field of natural gas production from semi-coke tail gas, can solve problems such as difficulty in ensuring stability, difficult temperature control, and no industrialized cases of semi-coke preparation of natural gas, so as to avoid equipment and operation and improve utilization Efficiency and the effect of reducing the risk of carbon accumulation

Active Publication Date: 2018-04-03
XINDI ENERGY ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in an adiabatic reactor, with the strong exothermicity of the methanation reaction, the temperature is not easy to control, and it is difficult to ensure the stable composition of the transformation.
[0011] Due to the unique composition of semi-coke tail gas and the complexity of impurities contained, there is no industrialization case of semi-coke to produce natural gas.

Method used

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  • A method and device for producing natural gas from low-hydrogen carbon bilan coke tail gas
  • A method and device for producing natural gas from low-hydrogen carbon bilan coke tail gas
  • A method and device for producing natural gas from low-hydrogen carbon bilan coke tail gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The hydrogen-to-carbon ratio of the blue-coke tail gas in the table below is 0.9891:

[0057]

[0058] Note: The semi-coke tail gas also contains impurities such as tar, benzene, naphthalene, phenol, dust, sulfide, ammonia, and heavy metals.

[0059] The semi-coke tail gas with a molar flow rate of 2000kmol / h is first pressurized to 3.0MPa, heat exchanged to 160°C, and desulfurized after entering the purification system, so that the sulfur content of the purified semi-coke tail gas is ≤20ppb.

[0060] Then the purified semi-coke tail gas is divided into three shares according to the volume ratio of 8:5:7, the first 797kmol / h gas and 170°C, 530kmol / h cycle gas (as shown in the figure, the cycle gas comes from R3 After the outlet gas) is mixed, it is mixed with 203kmol / h of circulating water (as shown in the figure, the circulating water comes from the reaction production water, after V1 is separated, a part is used for circulation), and the water content of...

Embodiment 2

[0063] The hydrogen-to-carbon ratio of the blue-coke tail gas in the table below is 0.7595:

[0064]

[0065] Note: The semi-coke tail gas also contains impurities such as tar, benzene, naphthalene, phenol, dust, sulfide, ammonia, and heavy metals.

[0066] The semi-coke tail gas with a molar flow rate of 2000kmol / h is first pressurized to 3.0MPa, heat exchanged to 160°C, and desulfurized after entering the purification system, so that the sulfur content of the purified semi-coke tail gas is ≤20ppb.

[0067] Then the purified semi-coke tail gas is divided into three shares according to the volume ratio of 18:14:18, the first 718kmol / h gas and the 170°C, 396kmol / h cycle gas (as shown in the figure, the cycle gas comes from R3 After the outlet gas) is mixed, it is mixed with 196kmol / h of circulating water (as shown in the figure, the circulating water comes from the reaction production water, after V1 is separated, a part is used for circulation), and the water con...

Embodiment 3

[0070] The hydrogen-to-carbon ratio of the blue-coke tail gas in the table below is 0.6027:

[0071]

[0072] Note: The semi-coke tail gas also contains impurities such as tar, benzene, naphthalene, phenol, dust, sulfide, ammonia, and heavy metals.

[0073] The semi-coke tail gas with a molar flow rate of 2000kmol / h is first pressurized to 3.0MPa, heat exchanged to 160°C, and desulfurized after entering the purification system, so that the sulfur content of the purified semi-coke tail gas is ≤20ppb.

[0074] Then the purified semi-coke tail gas is divided into three shares according to the volume ratio of 4:3:3, the first 799kmol / h gas and 170°C, 208kmol / h cycle gas (as shown in the figure, the cycle gas comes from R3 After the outlet gas) is mixed, it is mixed with 210kmol / h circulating water (as shown in the figure, the circulating water comes from the reaction production water, after V1 is separated, a part is used for circulation), and the water content of th...

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Abstract

A method for producing natural gas from low hydrogen carbon bicarbonate tail gas, comprising: the semicoke tail gas is divided into three shares after being purified and desulfurized, the first unit is mixed with circulating gas or circulating liquid, and enters a first-stage transformation-methanation integrated reactor; After the two streams are mixed with the outlet gas of the first-stage transformation-methanation integrated reactor, they enter the second-stage methanation reactor; after the third stream is mixed with the outlet gas of the second-stage methanation reactor, they enter the third-stage methanation reactor; The outlet gas of the first-stage methanation reactor enters the fourth-stage methanation reactor to generate methane-enriched gas; the methane-enriched gas is decarbonized or / and liquefied to obtain natural gas or liquefied natural gas. Through the method of the present invention, at a low hydrogen-to-carbon ratio other than the conventional process, the semi-coke tail gas is used to generate natural gas, which effectively improves the utilization efficiency of effective gas; and the present invention adopts the post-decarbonization process, which can reduce the circulation amount and reduce the risk of carbon deposition ; The present invention has the advantages of simple process, simple operation, low investment and high utilization rate of resources.

Description

technical field [0001] The invention relates to the field of natural gas synthesis, in particular to a method and device for producing natural gas from semi-coke tail gas. Background technique [0002] Semi-coke, also known as semi-coke, is a solid substance with high fixed carbon content produced by using Jurassic non-caking coal and weakly caking coal as raw materials by medium and low temperature dry distillation process, because it produces blue flame when burning. named. When semi-coke is produced, semi-coke tail gas and coal tar will be produced by-product at the same time. During the production process of the semi-coke furnace, every ton of semi-coke produced will produce 700Nm 3 The exhaust gas is composed of hydrogen, methane, carbon monoxide, carbon dioxide, nitrogen and so on. Due to the high content of nitrogen in the semi-coke tail gas, H 2 The content is low, the CO content exceeds 10%, and the calorific value is low, only 7113-8368kJ / Nm 3 , so the semi-co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/08
CPCC10L3/08
Inventor 常俊石史立杰刘雪飞张建祥马超李柏银李晨佳赵海龙朱攀中赵先兴刘鹏翔
Owner XINDI ENERGY ENG TECH
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