关键词:

节能减排, 压差发电, 天然气浅冷处理, 膨胀机, 发电机

Abstract:

Some gas fields with lean gas（i.e. lean gas fields） usually use dew-point controlled shallow cooling process in early-stage development. During shallow cooling，the J-T valve is used for throttling refrigeration，and at least 2.5~3.0 MPa of pressure energy is wasted on the J-T valve. In order to make full use of the pressure energy of natural gas and improve energy utilization，this paper explores the application of differential pressure power generation technology in the shallow cooling unit of natural gas based on the application of natural gas differential pressure power generation technology and the key equipment，taking the shallow cooling unit of Kelameili Gasfield of Xinjiang Oilfield as an example. It also demonstrates the feasibility of using turbine expander to generate electricity in natural gas shallow cooling unit. The results show that：according to the calculation results of power generation potential，a 150×10⁴  m³/d shallow cooling equipment can generate 350 kW·h per hour and 280×10⁴ kW·h per year，saving 1.092 million yuan by using a turbine expander to generate electricity with the pressure difference of 2.0 MPa of wet gas. The total project investment is estimated to be 4 million yuan，and it can be paid back in 3.6 years. It is concluded that using the pressure difference in the shallow cooling process of natural gas for power generation can not only fully utilize the pressure energy of natural gas，but also supplement the power supply for the site. It demonstrates good energy saving and emission reduction results and sets an excellent example，which can be promoted in the upstream oil and natural gas fields.

Key words:

energy conservation and emissions reduction；differential pressure power generation；shallow cooling of natural gas；expander；generator ,