Carbon dioxide desorption method for carbon capturing, storage and utilization technology

Abstract

The invention provides a carbon dioxide desorption method for a carbon capturing, storage and utilization technology. The carbon dioxide desorption method is applied in the technical field of reutilization of low-temperature waste heat of a cement kiln. The carbon dioxide desorption method for the carbon capturing, storage and utilization technology comprises the following desorption steps: starting and adjusting an electric adjusting valve I (9), allowing saturated steam in a cement kiln tail waste heat boiler (1) to pass through a temperature-reducing and pressure-reducing unit (3) for temperature reduction and pressure reduction, and allowing the temperature-reduced and pressure-reduced saturated steam to enter an amine reboiler (4) in a desorption tower (2) for heating an amine liquid;subjecting carbon dioxide which passes through the desorption tower (2) to heating and desorption; and allowing the saturated steam obtained after heating and desorption of the carbon dioxide which passes through the desorption tower (2) to generate liquid-changing so as to form saturated water, and allowing the saturated water to enter a condensate water recovery unit (7) through a water returnpipe (6). The carbon dioxide desorption method for the carbon capturing, storage and utilization technology provided by the invention does not affect normal operation of a cement kiln waste heat powergeneration system, can meet the needs of desorption operation of a CCS system, and reduces the investment of economic cost.

Description

technical field [0001] The invention belongs to the technical field of low-temperature waste heat reuse of cement kilns, and more specifically relates to a carbon dioxide desorption method for carbon capture, storage and utilization technology. Background technique [0002] Carbon capture, storage and utilization technology (CCS for short) is a process for purifying carbon dioxide emitted during the production process and then putting it into a new production process. This process can recycle carbon dioxide and generate economic benefits. CCS technology mainly uses chemical absorbents to absorb carbon dioxide in the flue gas in the absorption tower. The absorbent that absorbs carbon dioxide is pumped into the desorption tower for desorption. The heat required for the desorption of carbon dioxide in the desorption tower is heated by the steam at the bottom of the desorption tower. The steam heats the amine liquid through the reboiler, so that the temperature of the desorptio...

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Problems solved by technology

Therefore, the consumption of steam for CO2 desorption is huge, resulting in high cost of CO2 desorption

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