Production method of liquefied natural gas

Name: production method no of LNG: 99120786.6 key words: production method category of LNG: invention applicant: Yu Qingfa applicant: Design Office of Kaifeng air separation plant (retired) application time: unknown validity: unknown application scope: China is rich in natural gas reserves, but its development and utilization rate is very low Some enterprises burn it as a sky lamp, and some gas wells in the edge areas where gas layers are dispersed, and there are few abandoned reserves or gas pipelines are not suitable If we use liquefaction devices with less investment and easy to install and dismantle, we can liquefy these abandoned natural gas and use it again This kind of society The benefits and economic benefits are considerable Brief introduction: after compression and expansion of the external circulating nitrogen, the cold capacity is obtained to liquefy all the raw natural gas Some high boiling alkanes, such as ethane, propane, butane, etc., are first discharged from the device in the form of liquid state - by-product, and then enter the distillation tower (denitrification tower) for purification The liquid methane with purity of 99.5% is obtained from the tower kettle, and the gaseous nitrogen with purity of 99.99% is obtained from the top of the tower Technical features: 1 The high-purity nitrogen obtained from the top of the tower can be added to the circulating nitrogen to ensure the continuity of operation of the whole unit; 2 The high-purity liquid methane obtained from the bottom of the tower can be used as fuel for internal combustion engine and chemical raw material; 3 The principle is applicable to the pressure of raw gas (from the wellhead) 0.3mpa-20mpa; 4 After the natural gas is liquefied, it is convenient for transportation and storage; 5 When liquid methane is vaporized, the cooling capacity is 121 kcal (one kilogram of liquid methane is vaporized), and the temperature is - 162 ℃ Try to use this cooling capacity, and then store the vaporized methane into the gas pipeline network; 6 It is an ideal green fuel for Zui at present In the near future, it will be able to start trains and ships with great prospects 7 Main operators: various heat exchangers for raw natural gas from cooling, deoxidation tower, low temperature storage tank, nitrogen expander, cold valve, etc are all assembled in a large iron box (commonly known as cold box), which is convenient for overall handling and field assembly and disassembly 8 The basic investment is small, and the equipment cost of 10000 cubic meters (low pressure) to 12000 cubic meters (high pressure) of LNG per day is currently estimated at 12 million yuan to 15 million yuan In August 1997, Beijing Research Institute of Chemical Industry issued the "feasibility report on the daily treatment of 10000 square meters of LNG plant" (address: (475000) east room, floor 1, West unit, building 7, yard 6, Xipo West Street, Kaifeng City: 0378-3151703 brief introduction of the inventor: Yu Qingfa, born in August 1940, Yuyao, Zhejiang Province, Party member In September 1960, he graduated from Changyang high school in Shanghai, and in September 1965, he graduated from the refrigeration major of the power department of Xi'an Jiaotong University; in September 1965, he was assigned to the design office of Kaifeng air separation plant as a technician, and was awarded the title of engineer in 1988; in August 2000, he retired.)