Device and process for effectively removing sulfur trioxide in smoke through natural alkali

A technology of sulfur trioxide and trona, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of low utilization rate, poor development and utilization conditions, weak industrial foundation, etc., and achieve optimal adjustment and reduction. The effect of flue resistance and pressure loss reduction

Inactive Publication Date: 2013-04-24
SHANDONG UNIV
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  • Application Information

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Problems solved by technology

At present, trona is mainly used to produce soda ash, but the development and utiliza

Method used

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  • Device and process for effectively removing sulfur trioxide in smoke through natural alkali
  • Device and process for effectively removing sulfur trioxide in smoke through natural alkali
  • Device and process for effectively removing sulfur trioxide in smoke through natural alkali

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Embodiment 1

[0022] Taking a certain 300WM coal-fired unit as an example below, the present invention will be further described in conjunction with the accompanying drawings.

[0023] A device for effectively removing sulfur trioxide from flue gas by using trona, including a flue gas inlet 1 and a flue gas outlet 3, between the flue gas inlet 1 and the flue gas outlet 3 there is a curved transitional flue, the curved transitional flue A nozzle system 2 is provided inside, and an anti-wear plate 4 is arranged in the direction of flue gas flow of the nozzle system 2, and the nozzle system 2 is connected to a trona slurry preparation system.

[0024] According to flue gas SO 3 Trona content, composition of trona and actual operation of the boiler 3 , 50%Na 2 CO 3 ) with SO 3 The molar ratio is about 9:1, in order to ensure the removal of SO by semi-dry method 3 while improving the SO 3 removal rate.

[0025] The nozzle system is arranged in the flue between the tail of the SCR reactor ...

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Abstract

The invention relates to a device and a process for effectively removing sulfur trioxide in smoke through a natural alkali. The device comprises a smoke inlet and a smoke outlet, wherein a bent transitional flue is arranged between the smoke inlet and the smoke outlet; a nozzle system is arranged on the bent transitional flue; a wear-proof plate is arranged on the smoke incoming direction of the nozzle system; and the nozzle system is connected with a natural alkali slurry preparation system. The smoke from the outlet of a selective catalyst reduction (SCR) reactor is sprayed and washed through the natural alkali slurry to completely absorb sulfur trioxide (SO3), and then enters an air preheater. The device for effectively removing sulfur trioxide in the smoke through the natural alkali disclosed by the invention, through the nozzle system on the flue between the tail part of the SCR reactor and the air preheater and by spraying the natural alkali slurry into the flue, can absorb and remove SO3 with a removal efficiency of 80-90% through the strong alkalinity of the natural alkali; through setting the position, quantity, angle and outlet flow velocity of the nozzle, uniform mixing of the absorbent and the smoke is guaranteed; and through the wear-proof plate, abrasion of the smoke on the nozzle is reduced, and optimization and adjustment are carried, so as to reduce the resistance of the flue to the greatest extent.

Description

technical field [0001] The invention relates to a device and process for removing sulfur trioxide from flue gas, which reduces its corrosion to the air preheater, increases the life of the air preheater, and effectively reduces SO in the air. 3 content, reduce the impact on human life and natural ecology, and belong to the technical field of air pollutant control. Background technique [0002] A large amount of pollutants are produced in the process of coal combustion, especially SO 2 and NOx are the most serious. On the basis of the 03 version of the standard, the new air pollution emission standards for thermal power plants focus on increasing the emission of nitrogen oxides in the air pollutants of thermal power plants, and tightened the emission limits of sulfur dioxide, smoke and other pollutants. During the "Twelfth Five-Year Plan" period A large number of power plants use selective catalytic reduction (SCR) technology for denitrification, which has high denitrificat...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/50
Inventor 王志强王旭江马春元范燕荣张立强董勇崔琳
Owner SHANDONG UNIV
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