Process for combined decarbonization, desulphurization and denitration of industrial flue gas

The invention discloses a process for combined decarbonization, desulphurization and denitration of industrial flue gas. Carbon dioxide, sulfur dioxide and nitric oxide in the flue gas are removed through neutralization or reduction by absorbents in chemical reactions of corresponding absorption systems by using a chemical conversion method separately, one absorbent is added for absorption of a certain component in the flue gas so as to convert the component into an absorbent for purifying another component in the process, and then the product obtained through secondary conversion is convertedinto a denitration reducing agent, so that combined decarbonization, desulphurization and denitration is achieved, the difficult problem of secondary pollution caused by products which are produced in the decarburization, desulfurization and denitration process by using a chemical combination method is solved, and application of circular economy in treatment of flue gas is achieved. 一种工业烟气中碳硫硝协同联脱工艺，采用化学转化法将烟气中的二氧化碳、二氧化硫