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Method for coproduction of coal-based synthetic oil and LNG (liquefied natural gas)

A technology for coal-based synthesis and synthesis gas, which is used in the preparation of liquid hydrocarbon mixtures, petroleum industry, waste fuels, etc., can solve the problem of methane not being recycled, and achieve the effect of reducing system energy consumption, meeting market requirements, and increasing output

Active Publication Date: 2015-12-23
SYNEFUELS CHINA
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  • Claims
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AI Technical Summary

Problems solved by technology

F-T synthesis also produces a part of methane. After F-T synthesis tail gas is often separated from hydrogen, the remaining tail gas is used as fuel gas, and part of the methane is not recycled.

Method used

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  • Method for coproduction of coal-based synthetic oil and LNG (liquefied natural gas)
  • Method for coproduction of coal-based synthetic oil and LNG (liquefied natural gas)
  • Method for coproduction of coal-based synthetic oil and LNG (liquefied natural gas)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Embodiment 1, the method for coal-based synthetic oil co-production LNG

[0056] When the coal gasification unit adopts the pulverized coal pressurized gasification process, a process method of coal-based synthetic oil co-production LNG, such as figure 1 shown.

[0057] The specific process is as follows: Lump coal (101) is pressurized and gasified with crushed coal in a fixed bed (temperature: 1200°C, pressure: 4.5MPaG) to obtain crude gas (102), the main components of which are CO, H 2 、CH 4 , also including H 2 S, CO 2 , organic sulfur, tar, naphtha, phenol and ammonia and other impurities, among which CH 4 The content is 12mol%, H 2 / CO is 1.65. The crude gas (102) is first washed by low-temperature methanol in the pre-washing section (temperature: -40°C, pressure: 4.0MPaG) to remove naphtha in the gas to obtain naphtha (104), and then through the main washing section (temperature: -52°C, pressure: 4.0MPaG) to remove H 2 S, organic sulfur and CO 2 and other...

Embodiment 2

[0058] Embodiment 2, the method for coal-based synthetic oil co-production LNG

[0059] When the coal gasification unit adopts pulverized coal gasification or coal water slurry gasification process, another process method of coal-based synthetic oil co-production LNG, such as figure 2 shown.

[0060] The specific process is: pulverized coal (124) is gasified by pulverized coal or coal water slurry (temperature: 1350°C, pressure: 4.0MPaG) to obtain CO, H 2 Raw gas (125) as the main component, CH 4 Content 2 / CO ratio, H in the final shift gas (126) 2 The / CO ratio was 1.65. The shift gas (126) passes through the low-temperature methanol main washing section (temperature: -52°C, pressure: 3.4MPaG) to remove H 2 S, organic sulfur and CO 2 , the resulting F-T synthesis gas (107)CO 2 2 S+COS4 The content is 7mol%, and the oil-washed LPG (109) is obtained through the low-temperature oil washing unit, and the oil-washed dry gas (113) first enters the membrane separation device...

Embodiment 3

[0061] Embodiment 3, the method for coal-based synthetic oil co-production LNG

[0062] When the coal gasification unit adopts the double-gas head gasification process, a process method for the co-production of LNG with double-gas head coal-based synthetic oil, such as image 3 shown.

[0063] The lump coal (101) of the raw coal (127) enters the pulverized coal for pressurized gasification, and the pulverized coal (124) enters the pulverized coal or coal-water slurry gasification, and the distribution ratio of the raw coal can be adjusted according to the ratio of the final LNG product and oil product . When the raw coal (127) is 14.066 million tons / year, of which lump coal (101): pulverized coal (124) is 1:1, the final LNG product 1 (106) is 920 million Nm 3 / year, LNG product 2 (115) is 110 million Nm 3 / year, the final oil product gasoline (110)+diesel (111) is 2 million tons / year. The sulfuric acid-containing gas (103) obtained by the two gasification processes is mixe...

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Abstract

The invention discloses a method for coproduction of coal-based synthetic oil and LNG (liquefied natural gas). The method comprises steps as follows: 1) raw gas is obtained through gasification of feed coal; 2) the raw gas is subjected to a low-temperature methanol main washing section for removal of acid gas and synthesis gas is obtained; 3) the synthesis gas has an F-T synthesis reaction in an oil synthesis unit, and intermediate products, namely, heavy distillate, light distillate, heavy wax, F-T synthesis water and F-T synthesis tail gas, are obtained; 4) hydrofining and hydrocracking treatment is performed on the heavy distillate, the light distillate and the heavy wax in the intermediate products by an oil processing unit, and oil products, namely, gasoline and diesel, are obtained; the F-T synthesis tail gas is subjected to membrane separation treatment, obtained impermeable gas is subjected to cryogenic separation II, and the LNG product is obtained. With the adoption of the method, the LNG is coproduced while the coal-based oil is produced, and the produced acid gas, F-T synthesis water and tail gas can be recycled.

Description

technical field [0001] The invention relates to a method for coal-based synthetic oil co-production of LNG, which belongs to the technical field of petrochemical industry. Background technique [0002] "Short of oil, less gas, rich in coal" is the basic characteristic and national condition of my country's energy resources utilization, and coal resources will still occupy an important position in my country's future medium and long-term development. Transforming relatively abundant coal resources into oil products will reduce my country's dependence on foreign oil demand and ensure national energy security and sustainable economic development. [0003] LNG (liquefied natural gas) is a cleaner and more efficient energy source than coal or oil, with large calorific value, particle emissions and CO 2 The advantage of low emissions. With the implementation of my country's West-East Gas Transmission Project and the increase of LNG receiving sites, the proportion of natural gas ...

Claims

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Application Information

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IPC IPC(8): C10G2/00C10J3/46C10L3/08
CPCY02E50/30
Inventor 陈倩董根全史建中刘利军曹峰陈林峰李永旺曹立仁
Owner SYNEFUELS CHINA
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