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Title:
METHOD FOR PREPARING COALBED METHANE HYDRATE
Document Type and Number:
WIPO Patent Application WO/2017/088753
Kind Code:
A1
Abstract:
A method for preparing a coalbed methane hydrate. Coalbed methane forms micro bubbles by means of a gas distributor, enters an inner circulation reactor from the bottom, and has a hydration reaction by being in contact with a low-temperature and high-pressure water flow so as to generate coalbed methane hydrate slurry, and reaction heat is removed by a refrigeration unit. The reactor is provided with an inner circulator so as to form a buoyancy adjusting area, thereby promoting the separation efficiency of a gas-water-hydrate multi-phase system, realizing the fine control over a heat and mass transfer process, and increasing the gas content of a hydrate. Unreacted gas flows through the inner circulator, is then separated from the water and the hydrate, and is recycled back to the reactor; and the hydrate slurry flows through the inner circulator to realize liquid-solid separation, and separately flows in a light phase flow channel and a heavy phase flow channel. The hydrate slurry is discharged into an intermediate storage tank for carrying out gas-liquid and liquid-solid separation; after being concentrated, the slurry is separated to obtain a 'dry' hydrate product; and the separated unreacted gas and low-temperature water are recycled back to a reaction system. The method is capable of continuously, stably and efficiently preparing the hydrate.

Inventors:
ZHANG JIANWEN (CN)
XIN YANAN (CN)
ZHOU FENG (CN)
YANG LIN (CN)
Application Number:
PCT/CN2016/106900
Publication Date:
June 01, 2017
Filing Date:
November 23, 2016
Export Citation:
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Assignee:
UNIV BEIJING CHEMICAL TECH (CN)
CHINA SOLID GAS ENERGY TECH (BEIJING) CO LTD (CN)
CHENGDU QIANNENG TECH CO LTD (CN)
International Classes:
C10L3/10
Foreign References:
CN105779049A2016-07-20
CN205223137U2016-05-11
CN103571557A2014-02-12
CN203620609U2014-06-04
CN1281420A2001-01-24
US6192691B12001-02-27
Attorney, Agent or Firm:
BEIJING SIHAI TIANDA INTELLECTUAL PROPERTY AGENCY LTD. (CN)
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