The Structure Design and Experimental Study on Small Test Grade Biogas Refining Membrane Module

Ni Shuli;Liang Suyu;Li Lin;Liu Tienan;Du Qian;Chu Dongchen;College of Mechanical and Electrical Engineering,Northeast Forestry University;Heilongjiang Forest Engineering and Environmental Research Institute;The Key Laboratory of Forest Ecology and Forestry Ecological Engineering in Heilongjiang;

Biogas refining;;membrane module;;vehicle fuel;;hollow fiber membrane

The purpose of this study is to use the biogas upgrading of biogas project in forest area as natural gas grade fuel,and to provide new ideas for the use of energy in remote forest areas. In this paper,a multi-stage gas reflux decarburization process was used to design a small scale biogas separation membrane module for the treatment of 5. 5 m~3/h. The amount of membrane in the membrane core was calculated by chemical principle and the membrane shell parameters were designed. The 3 D model of membrane shell was modeled by Solid Works software and static analysis under simulated compression condition was carried out. Finally,the experiments were carried out with manufactured membrane module. The results showed that,under the normal temperature with inlet pressure 1. 0 MPa,the concentration of CH_4 in the osmotic side was about 48% and the recovery rate was low if only the first stage membrane module was used to purify biogas. If a secondary membrane component was used in tandem refining biogas,the purity of CH_4 could be up to 95. 52% and the CH_4 recovery rate was greater than 75%. A small scale biogas separation membrane module designed by multi-stage gas reflux decarburization process could be got from the experiment. When the intake pressure increased,the application of the secondary membrane component in series can purify the methane concentration in the primary purified biogas to the standard of the vehicle gas in our country.