CN207056338U - The regenerating unit of sour gas trapping solution in a kind of power-plant flue gas - Google Patents

Abstract

A regeneration device for acid gas trapping solution in power plant flue gas, the device includes a built-in circulation pipe located in the center of the heating evaporation chamber, the bottom inlet of the built-in circulation pipe is connected with the rich liquid pump of the absorption device, and the top outlet is located at the upper part of the liquid distributor , the liquid distributor is connected to the inlet of the uniformly distributed heating pipes in the heating evaporation chamber, the outlet of the heating pipe is directly connected to the lean liquid tank, the lean liquid outlet at the bottom of the lean liquid tank is connected to the lean liquid pump, and a demister is installed at the upper gas outlet , the gas outlet is connected to the inlet of the gas-liquid separator, the bottom liquid outlet of the gas-liquid separator is connected to the lean liquid tank, and the top gas outlet is connected to the air pump. The flow direction of the liquid vapor is the same as that of the liquid film, which can make the liquid film more uniform, thinner, and flow faster, which is beneficial to reduce heat transfer resistance, improve thermal efficiency and regeneration effect, and is especially suitable for absorbent systems with high viscosity.

Description

A regeneration device for acid gas capture solution in power plant flue gas

technical field

The utility model belongs to the technical field of power plant flue gas purification treatment, in particular to a regeneration device for acid gas trapping solution in power plant flue gas.

Background technique

China's power structure dominated by coal power is difficult to change in the medium and long term. SO ₂ and CO ₂ in the flue gas of coal-fired power plants are the main causes of global environmental problems such as acid rain, air pollution and greenhouse effect. China's control of SO ₂ And CO ₂ emissions are highly valued, especially SO ₂ emissions are strictly limited.

At present, the CO ₂ removal technology in coal-fired power plants is mainly based on the recyclable alcohol amine chemical absorption method, which is also the CO ₂ capture technology that is expected to achieve large-scale commercialization the fastest. The limestone-gypsum method is the main technology for SO ₂ removal, and the absorbent cannot be recycled. In order to solve the existing problems of the limestone-gypsum method, according to the characteristics of SO ₂ acid gas, some power plants use weakly alkaline buffers to achieve SO ₂ absorption and regeneration. Compared with the limestone-gypsum desulfurization process, the regenerative desulfurization process is simple, does not produce solid waste such as gypsum, and the absorbent can be recycled and by-products such as SO ₂ , sulfuric acid, sulfur and other chemicals.

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 absorbents with high viscosity, the traditional regeneration method is inefficient and consumes a lot of energy. Therefore, improving the rich liquid regeneration method and improving the steam utilization efficiency are of great significance to the energy saving and consumption reduction of renewable removal technology and the popularization and application in the field of power plant flue gas purification.

Contents of the invention

In order to overcome the above-mentioned shortcomings of the prior art, the purpose of this utility model is to provide a regeneration device for acid gas capture solution in power plant flue gas, so as to improve steam utilization efficiency and reduce energy consumption of rich liquid regeneration.

In order to achieve the above object, the technical solution adopted by the utility model is:

A regeneration device for acid gas capture solution in flue gas of a power plant, including a built-in circulation pipe 2 located in the center of the heating evaporation chamber 1, the bottom inlet of the built-in circulation pipe 2 is connected with the rich liquid pump 3 of the absorption device, and the top outlet is located in the liquid distribution On the upper part of the device 4, the liquid distributor 4 is connected to the inlet of the uniformly distributed heating pipe 5 in the heating evaporation chamber 1, and the outlet of the heating pipe 5 is directly connected to the lean liquid tank 6, and the upper gas outlet of the lean liquid tank 6 is separated from the gas and liquid The inlet of the device 9 is connected, the bottom liquid outlet of the gas-liquid separator 9 is connected back to the lean liquid tank 6, and the top gas outlet is connected to the air pump 10.

A demister 8 is provided at the upper gas outlet of the lean liquid tank 6 .

The lean liquid outlet at the bottom of the lean liquid tank 6 is connected to the absorbent inlet of the absorption device through a lean liquid pump 7 through a heat exchanger.

The heating tube 5 is a vertical tube suspended above the lean liquid tank 6, the top of the heating tube 5 is the inlet, and the bottom is the outlet.

The steam inlet of the heating evaporation chamber 1 is located at the upper part, and the condensed water outlet is located at the lower part.

The heating tube 5 is a falling film heating tube.

Compared with the prior art, the utility model adopts the tubular falling film method to heat and desorb the rich liquid, and the flow direction of the rich liquid vapor is the same as that of the liquid film, which can make the liquid film more uniform, thinner and faster, which is beneficial to reduce Heat transfer resistance, improve thermal efficiency and regeneration effect, especially suitable for absorbent systems with high viscosity. Compared with the traditional packed tower, the device is relatively simple, and it is not suitable for clogging, and there is no occurrence of liquid flooding in the tower. At the same time, it is relatively simple in maintenance and cleaning.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

The implementation of the utility model will be described in detail below in conjunction with the accompanying drawings and examples.

As shown in Figure 1, a regeneration device for the acid gas capture solution in the flue gas of a power plant includes a built-in circulation pipe 2 located in the center of the heating evaporation chamber 1, and the bottom inlet of the built-in circulation pipe 2 is connected with the rich liquid pump 3 of the absorption device , the top outlet is located at the top of the liquid distributor 4, the liquid distributor 4 is connected to the inlet of the uniformly distributed heating pipe 5 in the heating evaporation chamber 1, the outlet of the heating pipe 5 is directly connected to the lean liquid kettle 6, and the bottom of the lean liquid kettle 6 The lean liquid outlet is connected to the lean liquid pump 7, the demister 8 is installed at the upper gas outlet, the gas outlet is connected to the inlet of the gas-liquid separator 9, the liquid outlet at the bottom of the gas-liquid separator 9 is connected to the lean liquid tank 6, and the top gas The outlet is connected with air pump 10. The heating steam enters from the upper inlet of the heating evaporation chamber 1, and the condensed water flows out from the lower outlet.

Working principle and method of the present utility model are as follows:

The rich liquid from the absorption device enters the lower part of the built-in circulation pipe 2 in the center of the heating evaporation chamber 1 through the rich liquid pump 3 after heat exchange, and flows upward; the rich liquid enters the upper part of the heating evaporation chamber 1 after being preheated in the built-in circulation pipe 2 The liquid distributor 4 flows into the falling film heating tubes 5 after being redistributed by the liquid distributor 4, forms a liquid film along the inner wall of the tube and flows downward, and at the same time conducts heat transfer in the heating evaporation chamber 1; during the heating process of the rich liquid film Steam is formed, and the acid gas in the rich liquid is regenerated at the same time; the steam containing the acid gas regeneration gas flows rapidly downward in the heating tube 5, blowing the liquid film thinner, more uniform and faster, greatly reducing the heat transfer resistance , to improve heat transfer efficiency; the regenerated lean liquid enters the lean liquid kettle 6, and is pumped out by the lean liquid pump 7 as an absorbent for recycling; after the gas passes through the demister 8, it flows out from the gas outlet on the upper part of the lean liquid kettle 6, and is condensed After entering the gas-liquid separator 9 to realize gas-liquid separation, the condensate returns to the lean liquid tank 6, and the acid gas regeneration gas is extracted through the air pump 10. The heating steam enters from the upper inlet of the heating evaporation chamber 1, and the condensed water flows out from the lower outlet.

Claims (6)

1. the regenerating unit of sour gas trapping solution in a kind of power-plant flue gas, it is characterised in that including positioned at heating evaporation room (1) the built-in circulation pipe (2) at center, the bottom inlet of built-in circulation pipe (2) are connected with the rich solution pump (3) of absorption plant, top Outlet is positioned at the top of liquid distribution trough (4), liquid distribution trough (4) and equally distributed heating tube (5) in heating evaporation room (1) Entrance be connected, the outlet of heating tube (5) directly connects with lean solution kettle (6), the outlet of the upper gas of lean solution kettle (6) and gas-liquid point Entrance from device (9) is connected, and bottom liquid outlet tieback to lean solution kettle (6), the top gas of gas-liquid separator (9) is exported with taking out Air pump (10) is connected.

2. according to claim 1 in power-plant flue gas sour gas trapping solution regenerating unit, it is characterised in that it is described poor The upper gas exit of liquid kettle (6) sets demister (8).

3. according to claim 1 in power-plant flue gas sour gas trapping solution regenerating unit, it is characterised in that it is described poor The bottom lean solution outlet of liquid kettle (6) is connected by lean pump (7) through heat exchanger with the absorbent entrance of absorption plant.

4. according to claim 1 in power-plant flue gas sour gas trapping solution regenerating unit, it is characterised in that it is described plus Heat pipe (5) is vertical duct, is suspended in above lean solution kettle (6), and the top of heating tube (5) is entrance, and bottom is outlet.

5. according to claim 1 in power-plant flue gas sour gas trapping solution regenerating unit, it is characterised in that it is described plus The steam inlet of thermal evaporation room (1) is located at top, and condensation-water drain is arranged at bottom.

6. according to claim 1 in power-plant flue gas sour gas trapping solution regenerating unit, it is characterised in that it is described plus Heat pipe (5) is falling film heating pipe.