Device system for continuously trapping CO2 in flue gas of cement kiln through hydrate method

Abstract

The invention provides a device system for continuously trapping CO2 in flue gas of a cement kiln through a hydrate method. The device system comprises a tail exhaust fan, an electric three-way air valve, a chimney, a flue gas purifying device, a cooler, a flue gas compressor, a CO2 absorbing tower-regeneration tower unit, a cold energy recovery device, a waste heat energy storage device, a dehydration dryer, a CO2 cooler, a CO2 compressor and a liquefied CO2 storage tank. The CO2 absorbing tower-regeneration tower unit comprises a CO2 absorption tower, a poor / rich fluid heat exchanger device and a CO2 regeneration tower, and the above parts are orderly connected. The device system is based on a cement production line process and process equipment, utilizes cement production waste heat as heat exchange energy, utilizes a hydrate accelerator to continuously capture the CO2 in flue gas of the cement kiln, can purify the flue gas, and realizes high efficiency, low self-consumption, low investment and low operating cost.

Description

technical field [0001] The invention relates to the field of environmental protection and low-carbon technology, in particular to a hydrate method for continuously capturing CO in cement kiln flue gas 2 equipment system. Background technique [0002] Climate change has become one of the issues affecting human survival and development, and carbon dioxide emitted by industry is considered to be the main cause of climate warming. As the largest developing country in the world, our country uses coal as its primary energy and thermal power as its secondary energy as its energy structure. With the rapid growth of economic aggregate, the CO of primary energy and secondary energy 2 Emissions have the characteristics of fast growth and large total volume, but the high investment and high capture cost of the current carbon emission reduction and climate change CCS or CCUS technology have become a serious obstacle to popularization and application. The existing research and demonstr...

AI Technical Summary

Problems solved by technology

This hydrate method has no serious secondary pollution caused by the traditional chemical adsorption method or physical chemical adsorption method, but there are still the following problems: it needs to react for several hours in a closed high-pressure reactor under high-pressure stirring, and the reaction time for hydrate formation It is still too long; the hydration reaction needs to be carried out under electromagnetic stirring in a closed high-pressure container, and the continuous absorption of CO in the flue gas flow cannot be achieved. 2 ; Produced CO 2 The energy consumption of compressing into a liquid state is too high, and the separation capacity is insufficient

The device uses boiler recovery waste heat as energy to reduce CO in cement kiln exhaust gas 2 The capture of a large amount of high temperature and high pressure waste heat is not well utilized, and the degree of energy saving is not high, which has certain limitations

Images