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Method and device for reducing regeneration energy consumption of decarburization absorption liquid

A technology of absorbing liquid and decarbonization, which is applied in the field of energy saving and environmental protection, can solve the problems of reducing the energy consumption of absorbing liquid regeneration, and achieve the effects of saving decarbonization operating costs, reducing heating energy consumption, and reducing the amount of rich liquid regeneration

Inactive Publication Date: 2014-08-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, what leaves the top of the regeneration tower is wet sour gas with saturated water, and the temperature is relatively high. In addition, the temperature of the lean liquid after heat exchange is still higher than normal temperature. If the waste heat energy is used reasonably, the energy consumption of the absorption liquid regeneration will be further reduced

Method used

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  • Method and device for reducing regeneration energy consumption of decarburization absorption liquid
  • Method and device for reducing regeneration energy consumption of decarburization absorption liquid
  • Method and device for reducing regeneration energy consumption of decarburization absorption liquid

Examples

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Embodiment 1

[0034] Such as figure 1 The method and device for reducing the regeneration energy consumption of the decarburization absorption liquid of the present invention shown in the present invention, the gas to be purified enters the absorption tower 1 from the gas inlet 11 to be purified, and the operating pressure in the tower is 4MPa, and the gas is discharged from the purified gas outlet 11 after purification, Activated MDEA decarbonization absorption tower absorbs CO in sufficient contact 2 The activated MDEA solution (rich liquid) flows out from the bottom of the tower, and 3 / 5 of the rich liquid flow (rich liquid A) enters the first flash tank 2, and the CO absorbed in the solution at normal pressure (local atmospheric pressure) 2 After desorption, the flash liquid is subjected to low-density ultrasonic waves at the outlet of the first flash tank after flash desorption, and the ultrasonic working time is 2 seconds. 2 . The remaining 2 / 5 rich liquid (rich liquid B) enters the...

Embodiment 2

[0036] This embodiment is basically the same as Embodiment 1, the difference is: as figure 2 , 1 / 3 of the rich liquid (rich liquid A) applies low-density ultrasound to the flash liquid after flash desorption in the first flash tank, and the ultrasonic working time is 30 seconds; 2 / 3 of the rich liquid (rich liquid C) does not pass through the first flash tank The second flash tank decompresses and flashes, and directly enters the desorption device 21 installed on the top of the regeneration tower after being heated by a heat exchanger and a heat pump. In this device, the rich liquid releases a large amount of acid gas and is discharged through the desorption gas outlet 22. The diameter of the device is 1.1 times the diameter of the regeneration tower, and the bottom of the device communicates with the main body of the regeneration tower.

Embodiment 3

[0038] This embodiment is basically the same as Embodiment 2, except that the desorption device installed at the top of the regeneration tower has a diameter of 1.5 times the diameter of the regeneration tower.

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Abstract

The invention relates to a method and a device for reducing regeneration energy consumption of decarburization absorption liquid. A heating regeneration process is carried out to a rich solution which absorbs carbon dioxide and is discharged from a bottom of an absorption column. Heat is recovered, by a heat pump, from gas discharged from a top of a regeneration column and / or a heat-exchanged and temperature-reduced barren solution discharged from the bottom of the regeneration column, wherein the heat is supplied to be provided for heating liquid in the bottom of the regeneration column and a heat-exchanged rich solution. With the heat pump, temperature of the rich solution is increased and the energy consumption of heating is significantly reduced, and furthermore, desorption efficiency of acid gas in the regeneration column is increased. After the majority of the rich solution is subjected to a flash evaporation process by reducing the pressure to a normal pressure, the flash-evaporated solution is free of heating regeneration and is directly flowed back to the regeneration column for absorbing high-concentration CO2, so that regeneration amount of the rich solution is greatly reduced with an absorption effect being ensured, thereby regeneration energy consumption is reduced and decarburization operation cost is saved. Supersonic wave is used for desorbing CO2 in a flashed solution so that desorption efficiency of CO2 can be further improved.

Description

technical field [0001] The invention relates to a method and a device for reducing energy consumption of regeneration of a decarbonized absorption liquid by a chemical absorption method and belongs to the field of energy conservation and environmental protection. Background technique [0002] The chemical absorption decarburization method uses a weak alkaline solution as the absorbent. Carbon dioxide and the solvent undergo a chemical reaction in the absorption tower. The carbon dioxide enters the solvent to form a rich liquid, and then the rich liquid enters the desorption tower to heat and decompose carbon dioxide. Absorption and desorption are carried out alternately. , so as to realize the separation and recovery of carbon dioxide. Commonly used chemical absorption methods include activated hot potassium alkali method, alcohol amine method, etc. At present, alcohol amine method is widely used in industry for decarburization. [0003] Alcohol amine desulfurization and de...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/62B01D53/96C01B31/20C01B32/50
CPCY02P20/10Y02P20/129Y02P20/151Y02P20/50
Inventor 张书廷赵旭
Owner TIANJIN UNIV
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