Regeneration device for solution for trapping acidic gases from power plant flue gas and method

Abstract

The invention relates to a regeneration device for a solution for trapping acidic gases from power plant flue gas and a method. The device comprises a built-in circulating tube which is located at the center of a heating evaporation chamber, wherein a bottom inlet of the built-in circulating tube is connected with a rich solution pump of an absorption device, a top outlet of the built-in circulating tube is located at the upper part of a liquid distributor, the liquid distributor is connected with inlets of heating tubes which are uniformly distributed in the heating evaporation chamber, outlets of the heating tubes directly communicate with a lean solution tank, a bottom lean solution outlet of the lean solution tank is connected with a lean solution pump, a demister is arranged at an upper gas outlet, the gas outlet is connected with an inlet of a gas-liquid separator, a bottom liquid outlet of the gas-liquid separator is connected with the lean solution tank, and a top gas outlet of the gas-liquid separator is connected with a gas pump. According to the device and the method, heated desorption is carried out on a rich solution in a tube-type falling film manner, and a flow direction of rich-solution steam is the same as that of a liquid film, so that the liquid film can be more uniform and thinner and be higher in flow velocity, the lowering of heat transfer resistance is facilitated, the heat efficiency is increased, the regeneration effect is improved, and thus, the device and the method are particularly applicable to absorbent systems with relatively high viscosity.

Description

technical field [0001] The invention belongs to the technical field of power plant flue gas purification treatment, and in particular relates to a regeneration device and method for acid gas capture solution in power plant flue gas. Background technique [0002] my country's coal-based power structure is difficult to change in the medium and long term, and SO in the flue gas of coal-fired power plants 2 and CO 2 It is the main cause of global environmental problems such as acid rain, air pollution and greenhouse effect. 2 and CO 2 attaches great importance to the emission of SO 2 Emissions are strictly limited. [0003] Currently, coal-fired power plants CO 2 The removal technology is mainly based on the recyclable alkanolamine chemical absorption method, which is also the CO2 technology that is expected to achieve large-scale commercialization the fastest. 2 capture technology. SO 2 The main removal technology is limestone-gypsum method, and the absorbent cannot be ...

AI Technical Summary

Problems solved by technology

[0004] The main problem faced by the renewable removal process of acid gas in power plant flue gas is that the rich liquid formed after the absorbent is loaded with acid gas needs to be sent to the regeneration tower for heating and regeneration, and this process requires a large amount of steam consumption, resulting in high energy consumption of the system , especially for high-viscosity absorbents, traditional regeneration methods are inefficient and energy-intensive

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