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System and method for preparing methane from coal under condition of supercritical water

A supercritical water and supercritical technology, applied in the direction of bulk chemical production, petroleum industry, gas fuel, etc., to achieve the effect of large social benefits

Inactive Publication Date: 2010-07-14
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a big deficiency in using coal as a fuel utilization mode

Method used

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  • System and method for preparing methane from coal under condition of supercritical water
  • System and method for preparing methane from coal under condition of supercritical water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] like figure 1 As shown, a coal-to-methane system under supercritical water conditions includes a high-pressure plunger pump 1, a delivery pipeline 8, a supercritical reactor 3, a condenser 4 and a gas-liquid separator 5, a high-pressure plunger pump 1, a supercritical The reactor 3 , the condenser 4 and the gas-liquid separator 5 are connected in sequence through a delivery pipeline 8 . A heater 9 is housed in the supercritical reactor 3 . A heat exchanger 2 is also provided on the delivery pipeline between the high-pressure plunger pump 1 , the supercritical reactor 3 and the condenser 4 . The output port of the high-pressure plunger pump 1 is connected to the first heat exchange channel of the heat exchanger 2, and the coal-water slurry output by the high-pressure plunger pump 1 is input into the heat exchanger 2 as a cold medium, and the coal-water slurry after heat exchange is input into the supercritical reaction device 3; the output port at the top of the superc...

Embodiment 2

[0035] A method for producing methane from coal-water slurry under supercritical conditions, comprising the following steps:

[0036] (1) The coal-water slurry A of a certain flow is pressurized by the coal-water slurry plunger pump 1, and enters the reactor 3 after passing through the heat exchanger 2;

[0037] (2) close the reactor outlet valve, after there is a certain amount of coal-water slurry in the kettle reactor 3, close the plunger pump of the coal-water slurry, and statically heat the coal-water slurry with a heater;

[0038] (3) When the pressure in the reactor 3 reaches 30 MPa and the temperature reaches 395° C., open the reactor outlet valve;

[0039] (4) Start the coal-water slurry plunger pump 1, pressurize the coal-water slurry A from the storage tank to 30MPa, continuously inject it into the reactor 3, and adjust the flow rate of the coal-water slurry plunger pump 1 to slowly rise to the rated value flow;

[0040] (5) The coal-water slurry enters the reacto...

Embodiment 3

[0044] like figure 1 As shown, this example is basically the same as Example 2. The coal-water slurry A is prepared from bituminous coal with a carbon content of 85% through fine washing, pressurized by the plunger pump 1 of the coal-water slurry, and after heat exchange by the heat exchanger 2 Enter the tubular supercritical reactor 3. In the reactor 3, it is heated by its own heater and reacts. The gas-vapor mixture coming out of the top of the reactor 3 is condensed by the condenser 4 after exchanging heat in the heat exchanger 2, and enters the gas-liquid separator 5 for gas-liquid separation. Separation affords gas product and water, respectively. The bottom of the reactor 3 is equipped with an inorganic salt separation system, and the valves V1 and V2 are intermittently opened at regular intervals to discharge inorganic salts and avoid damage to the equipment.

[0045] A method for producing methane from coal-water slurry under supercritical conditions, comprising the ...

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Abstract

The invention relates to a system and a method for preparing methane from coal under the condition of supercritical water, aiming to provide a system and a method for preparing methane under the condition of the supercritical water by using coal as a raw material and reforming and converting macromolecular carbon compounds in the coal into micromolecular methane, CO, H2, and the like. The invention adopts the technical scheme that the system for preparing the methane under the condition of the supercritical water comprises a high-pressure plunger pump, a conveying pipeline, a supercritical reactor, a condenser and a gas-liquid separator, wherein the high-pressure plunger pump, the supercritical reactor, the condenser and the gas-liquid separator are sequentially connected through the conveying pipeline; and the supercritical reactor is internally provided with a heater.

Description

technical field [0001] The invention relates to the field of methane preparation, and more specifically relates to a system and method for preparing methane under supercritical water conditions using coal as a raw material. Background technique [0002] my country's fossil energy structure is dominated by coal, supplemented by oil and natural gas, which is caused by the different reserves of various fossil energy. So far, the proven coal reserves are 1.5 trillion tons, with an annual mining of 2 billion tons, which can be exploited for 750 years, while oil reserves are 160 million tons, accounting for only about 3% of the world's total, and the mineable life is only 20.6 years; consumption of natural gas accounted for only 2.1%. [0003] The utilization of coal is mainly to use its combustion heat, which is generally used for direct combustion. Therefore, the utilization of coal with low calorific value, such as lignite, is greatly restricted; on the other hand, coal will p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08C10J3/48C10J3/46
CPCY02P20/54
Inventor 廖传华方向朱跃钊欧阳平凯
Owner NANJING UNIV OF TECH