Method for preparing coalbed methane hydrate

A technology of coalbed methane and hydrate, which is applied in the direction of gas fuel, petroleum industry, fuel, etc., can solve the problems of violent fluctuations in the production process, difficulty in control, and different pipeline pressures, so as to improve separation efficiency and production efficiency, promote rapid production, The effect of increasing the gas content

Active Publication Date: 2016-07-20
BEIJING UNIV OF CHEM TECH +2
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Problems solved by technology

[0012] (3) Connection problems with different pipeline pressures
[0013] Coalbed methane needs to be pressurized in every link from the wellhead to the user, resulting in increased costs
In addition, when using pressure pipelines to transport coalbed methane, due to the existence of a large amount of O2 and the increase of temperature accompanied by pressurization of coalbed methane, it is possible that the coalbed methane

Method used

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  • Method for preparing coalbed methane hydrate
  • Method for preparing coalbed methane hydrate
  • Method for preparing coalbed methane hydrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] Start the cold storage unit 9 and the refrigeration unit 7, supply chilled water to the heat exchange mechanism set in the water tank 11 and the intermediate storage tank 8, and control the temperature in the entire internal circulation flow reactor 2 at 4 ° C; start the water pump 6 and The central control system 13 pumps water equipped with additives into the reaction unit of the reactor. When the water level at the top of the reactor exceeds the top of the internal circulator and reaches the designated liquid level, open the discharge valve 5 at the outlet of the bypass pipe, adjust the opening degree of the valve and the displacement of the transfer pump 6, so that the water passes through the discharge valve 5 and the intermediate storage tank 8. The separator 12 and the water tank 11 form a stable water cycle; after that, 98% of the coal bed gas enters the tube side 24 of the internal circulation flow reactor 2 through the flow regulating valve and the gas nozzle, ...

Embodiment 2

[0088] Adopt the technological process of embodiment 1, but the pressure in the reaction tower is 7.3MPa, and the temperature in the tower is 6.5 ℃. The reaction produces a viscous colloidal hydrate slurry, and the gas content of methane in the hydrate reaches 174V / V.

Embodiment 3

[0090] Adopt the technological process of embodiment 1, but the pressure in the reaction tower is 7.3MPa, and the temperature in the tower is 6 ℃. The raw material concentration of coalbed methane is about 50%, according to the process conversion unit figure 2 The control logic controls the process to form a multi-stage countercurrent hydration reaction process, and the reaction produces a viscous colloidal hydrate slurry, and the methane gas content in the hydrate reaches about 160V / V. This method has remarkable economy.

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Abstract

The invention relates to a method for preparing coalbed methane hydrate. According to the invention, coalbed methane is processed with a gas distributor, and forms fine bubbles; the fine bubbles enter from the bottom of an internal circulation flow reactor, and contact a low-temperature and high-pressure water flow, such that a hydration reaction is carried out, and coalbed methane hydrate slurry is formed; and reaction heat is removed through a cooling unit. An internal circulation device is arranged in the reactor, such that a buoyancy regulation zone is formed. The separation efficiency of a gas-water-hydrate multi-phase system is promoted; precise control over a heat and mass transfer process is realized; and the gas content of the hydrate is improved. Unreacted gas flows through the internal circulation device, and separated from water and hydrate. The gas is then returned to the reactor. The hydrate slurry flows through the internal circulation device, and liquid-solid separation is realized; and the liquid and solid respectively flows through a light phase flow channel and a heavy phase flow channel. The hydrate slurry is discharged into a central storage tank, and is subjected to gas-liquid and liquid-solid separation. After the slurry is concentrated, the slurry is separated, such that a dry hydrate product is obtained. Separated unreacted gas and low-temperature water are returned to the reaction system. With the method provided by the invention, hydrate can be prepared continuously, stably and highly efficiently.

Description

technical field [0001] The invention relates to a method capable of producing coal bed gas hydrate continuously, stably and efficiently. The invention belongs to the field of coal bed gas storage and transportation, and the technology and device of the invention can collect, store and transport coal bed gas safely and conveniently, and improve the utilization effect of the coal bed gas. Background technique [0002] Coalbed methane is an unconventional natural gas energy resource, a clean energy, and the effective use of coalbed methane is conducive to environmental protection and sustainable development of the national economy. [0003] Energy has a particularly important strategic position in the national economy. my country's current energy supply and demand contradiction is sharp, the structure is irrational; energy utilization efficiency is low; primary energy consumption is dominated by coal, and the massive consumption of fossil energy has caused serious environmenta...

Claims

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Application Information

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IPC IPC(8): C10L3/10
CPCC10L3/10
Inventor 张建文辛亚男周峰李晓云杨林
Owner BEIJING UNIV OF CHEM TECH
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