System device for trapping liquefied carbon dioxide by using cold energy of liquefied natural gas and method of device

Abstract

The invention discloses a system device for trapping liquefied carbon dioxide by using cold energy of liquefied natural gas and a method of the device. The system device comprises an LNG (Liquefied Natural Gas) cold energy recovery and pressure energy recovery system, a fuel gas combustion electricity production, smoke waste heat recovery electricity production and smoke circulation system and a smoke and carbon dioxide separation and purification, dimethylmethane circulation and carbon dioxide liquefying system. The LNG cold energy recovery and pressure energy recovery system, a fuel gas electricity production technology and a carbon dioxide liquefying and trapping are combined, so that the LNG cold energy is recovered, and at the same time, conventional refrigeration devices are avoided, the carbon dioxide liquefying and trapping cost is reduced, efficient and diversified utilization of the LNG cold energy is realized, the energy utilization rate is increased, and remarkable environmental benefits, economic benefits and social benefits are obtained.

Description

technical field [0001] The invention belongs to the field of cold energy utilization of liquefied natural gas and carbon dioxide emission reduction, and in particular relates to a system device and method for capturing liquefied carbon dioxide by utilizing cold energy of liquefied natural gas. Background technique [0002] LNG and its cold energy utilization: liquefaction is a feasible way to transport natural gas, and the use of insulated LNG storage tanks to transport liquefied natural gas has become an important means of modern natural gas trade. The transported liquefied natural gas is pressurized at the receiving station and then gasified into the gas pipeline network for transmission and distribution. This process releases about 800KJ / kg of cold energy. In the 1990s, people have begun to study the technology of LNG gasification cold energy recovery and utilization. At present, LNG cold energy is mainly used for air separation, light hydrocarbon separation, cold energy ...

AI Technical Summary

Problems solved by technology

[0011] Chinese patent 201020000778.X provides a conventional carbon dioxide capture technology for coal-fired power plants, which uses ethanolamine solution to absorb carbon dioxide and obtain separation and purification, but this process lacks the carbon dioxide liquefaction process and the possibility of long-distance transportation

It uses the cold energy of LNG gasification to desublimate the carbon dioxide in the flue gas, and the carbon dioxide condensed on the outer wall of the heat exchanger is recovered through the alternate operation of two parallel heat exchangers. Big

[0015] Chinese Invention Patent (Application No.) 201110073906.2 presents a scheme for generating low-temperature carbon dioxide capture through the flue gas throttling expansion method. This scheme eliminates the carbon dioxide purification process, but the throttling pressure is high, and the cost of air compression and post-operation High cost and low CO2 capture rate, about 10%

Images