Technical and economic analysis of compressed natural gas production with coal-bed methane

In order to increase the utilization rate and extend the utilization routes of low concentrated coal-bed methane,the equipments selection,utility consumption and project investment as well as economy and cost were calculated on the basis of as-developed low concentrated coal bed methane( CBM) upgrade to compressed natural gas( CNG) technology,with an annual output of 20 million standard cubic meters natural gas project as example.The results shows that the electricity consumption is 15.625 6 million kWh; the water consumption is 26.72 thousand tons; the gas consumption is 0.96 million Nm~3; the floor area is 18 thousand m~2.The total investment of this project is 78.46 million; while the construction investment is 69.9 million. The construction cost is 56. 21 million and the other costs are 22. 25 million.Accordingly,when the selling price of CNG is 2.6 per Nm~3,financial internal rate of return of the project is 31.87%( after tax);while the investment recovery period is 4.44 years( including 1.5 years construction period).And the unit product cost is 1.3 per Nm~3.