A system and method for coal-to-natural gas co-production of methanol

A technology for coal-to-natural gas and natural gas, applied in the field of coal-to-natural gas co-production of methanol, can solve problems such as greenhouse effect and carbon element loss, and achieve the effects of improving utilization rate, reducing emissions, and diversifying product structure.

Active Publication Date: 2021-05-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Excess carbon will be converted to CO in the acid gas removal unit 2 Exhausted from the system in the form of carbon dioxide, on the one hand, it will cause the greenhouse effect, and on the other hand, it will also cause the loss of carbon elements

Method used

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  • A system and method for coal-to-natural gas co-production of methanol
  • A system and method for coal-to-natural gas co-production of methanol
  • A system and method for coal-to-natural gas co-production of methanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The air flow rate is 400000Nm 3 / h into the air separation unit, separated to get 85000Nm 3 Oxygen product of / h (O 2 The content is 99.5mol%) and 310000Nm 3 / h nitrogen product (N 2 content of 99.0mol%), the raw material lignite flow rate is 260t / h, together with oxygen and medium-pressure steam, enter the coal gasification unit (gasifier temperature is 1050°C, pressure is 4.0MPaA), the crude synthesis produced by the coal gasification unit The gas volume is 27,760 kmol / h. After the crude synthesis gas enters the acid gas removal unit to remove carbon dioxide and sulfide, the purified synthesis gas (CO 2 The content is 0.05ppm, H 2 The S content is 0.05ppm) and the amount is 18230kmol / h, the hydrogen-carbon ratio of the purified syngas is 2.7,

[0056] The split ratio of the purified syngas at the outlet of the acid gas removal unit is 0.25, a part of the purified syngas (20% of the purified syngas) enters the methanation unit, and the other part (80% of the purif...

Embodiment 2

[0058] The air flow rate is 401500Nm 3 / h into the air separation unit, separated to get 85000Nm 3 Oxygen product of / h (O 2 The content is 99.5mol%) and 316000Nm 3 / h nitrogen product (N 2 content of 99.0mol%), the raw material lignite flow rate is 260t / h, together with oxygen and medium-pressure steam, enter the coal gasification unit (gasifier temperature is 1050°C, pressure is 4.0MPaA), the crude synthesis produced by the coal gasification unit The gas volume is 27,760 kmol / h. After the crude synthesis gas enters the acid gas removal unit to remove carbon dioxide and sulfide, the purified synthesis gas (CO 2 The content is 0.05ppm, H 2 The S content is 0.05ppm) and the amount is 18230kmol / h, the hydrogen-carbon ratio of the purified syngas is 2.7,

[0059] The split ratio of the purified syngas at the outlet of the acid gas removal unit is 0.25, a part of the purified syngas (20% of the purified syngas) enters the methanation unit, and the other part (80% of the purif...

Embodiment 3

[0061] The air flow rate is 400000Nm 3 / h into the air separation unit, separated to get 85000Nm 3 Oxygen product of / h (O 2 The content is 99.5mol%) and 310000Nm 3 / h nitrogen product (N 2 content of 99.0mol%), the raw material lignite flow rate is 260t / h, together with oxygen and medium-pressure steam, enter the coal gasification unit (gasifier temperature is 1050°C, pressure is 4.0MPaA), the crude synthesis produced by the coal gasification unit The gas volume is 27,760 kmol / h. After the crude synthesis gas enters the acid gas removal unit to remove carbon dioxide and sulfide, the purified synthesis gas (CO 2 The content is 0.05ppm, H 2 The S content is 0.05ppm) and the amount is 18230kmol / h, the hydrogen-carbon ratio of the purified syngas is 2.7,

[0062] The split ratio of the purified syngas at the outlet of the acid gas removal unit is 0.43, a part of the purified syngas (30% of the purified syngas) enters the methanation unit, and the other part (70% of the purif...

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Abstract

The invention belongs to the technical field of coal chemical industry, and in particular relates to a system and method for coal-to-natural gas co-production of methanol. The system includes air separation unit, coal gasification unit, acid gas removal unit, cryogenic separation unit, methanation unit, methanol synthesis unit and methanol rectification unit. This method uses the carbon dioxide discharged from the acid gas removal unit as the raw material gas for methanol synthesis, which can not only ensure the optimal hydrogen-carbon ratio of the methanol synthesis unit, increase the output of methanol, but also reduce CO 2 emissions; supplementing the hydrogen-rich purge gas from the methanol synthesis unit to the methanation unit can not only ensure the optimal hydrogen-carbon ratio of the methanation unit, increase the production of SNG, but also reduce the purge gas emissions. The method improves the utilization rate of carbon element and hydrogen element by coproducing natural gas and methanol, wherein the utilization rate of carbon element can reach more than 50%, and the utilization rate of hydrogen element can reach more than 65%. The amount of natural gas and methanol output can be adjusted according to changes in market prices.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and specifically relates to a system and method for coal-to-natural gas co-production of methanol. Through this invention, the production of natural gas and methanol of different scales can be realized, and part of the CO removed by the acid gas removal unit can be recycled. 2 gas and recycling of purge gas from the methanol synthesis unit. Background technique [0002] As a clean, safe, convenient and high-quality energy, natural gas (SNG) has always played an important role in the world's energy field. It is widely used in chemical industry, power generation and other industries, as well as commercial and civil fields. Natural gas with high calorific value can also be used as an energy storage carrier. With the continuous and rapid development of my country's economy and the increasing pressure of air pollution control, the gap between natural gas resources and market supply and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10J3/00C10K1/00C10L3/08C07C29/151C07C29/80C07C31/04
CPCC07C29/1518C07C29/80C10J3/00C10K1/004C10L3/08C07C31/04Y02P20/129
Inventor 杨思宇刘兆利郑景元钱宇
Owner SOUTH CHINA UNIV OF TECH
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