SEA WATER DESALINATION SYSTEM USING FLUE GAS HYDRATE METHOD BASED ON LNG COLD ENERGY

摘要

Provided is a sea water desalination system using a flue gas hydrate method based on LNG cold energy, belonging to the technical field of hydrate application. CO2 in the flue gas is captured by means of the generation of a hydrate, two stages of hydrate generation chambers are provided for improving the yield of the hydrate, the CO2 hydrate is purified using two steps of gas separation and liquid separation, respectively, and two hydrate decomposition methods, i.e., a heat exchange-type hydrate decomposition method and an air extraction-type hydrate decomposition method, are respectively used to achieve the utilisation of the residual heat of the flue gas and the recycling of CO2. The integration of CO2 capturing and sea water desalination is realized, the problem of a cold energy source for the sea water desalination in the hydrate method is solved by using LNG cold energy, the structure is rational, and the system is exquisite; the two stages of hydrate generation chambers not only solve the problem of capturing CO2 in the flue gas, but also ensure the generation amount of the hydrate; two kinds of hydrate decomposition chambers not only result in the utilisation of the residual heat of hot flue gas and a reduction of heat discharge, but also realize the recycling and storage of CO2; and the sea water desalination system has a high bearing capacity to flue gas source changes, is not influenced by seasons and environments, and has a great practical application value.