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Ultralow emission method and device for split-type flue gas desulfurization and dust removal

A technology for desulfurization, dust removal, and discharge devices, which is applied in separation methods, chemical instruments and methods, and gas treatment, and can solve problems such as increasing tower height, high energy consumption, and high operating costs

Inactive Publication Date: 2016-07-06
ASIA PACIFIC ENVIRONMENTAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the characteristics of ammonia desulfurization itself, the flue gas after desulfurization carries fine particles including soot, absorbents, by-products, etc. It is difficult for some devices to meet the requirements of ultra-low emissions
Most of the existing devices are built-in, that is, the oxidation circulation tank is at the bottom of the desulfurization tower, which greatly increases the height of the tower body, high energy consumption, and high operating costs

Method used

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  • Ultralow emission method and device for split-type flue gas desulfurization and dust removal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 1 As shown, a separate ultra-low emission device for flue gas desulfurization and dust removal includes a desulfurization tower 1 and an oxidation circulation tank 27 placed outside the desulfurization tower 1; the desulfurization tower 1 and the oxidation circulation tank 27 are connected by pipelines. Compared with the existing device, the external oxidation circulation tank 27 can reduce the height of the desulfurization tower, and the oxidation circulation tank 27 is selected according to the flue gas conditions, which is more reasonable in type selection, can reduce energy consumption and investment.

[0022] Among them, the flue gas inlet 2 and the flue gas outlet 26 of the desulfurization tower are provided on the tower body of the desulfurization tower 1, and the flue gas inlet 2 and the flue gas outlet 26 of the desulfurization tower are arranged in sequence in the desulfurization tower 1 according to the flow direction of the flue gas. Washing a...

Embodiment 2

[0039] A split-type ultra-low emission method for flue gas desulfurization and dust removal. The device described in Example 1 is used for desulfurization and dust removal. Hot flue gas enters the washing and cooling section 5 from the flue gas inlet 2, and is sprayed countercurrently with ammonium sulfate solution. The hot flue gas is cooled by adiabatic evaporation during this process. The heat of the flue gas evaporates part of the water in the solution, concentrates it to saturation, and precipitates ammonium sulfate grains. The content of the crystal slurry reaches the process control index and is transported out of the tower;

[0040] When the flue gas enters the primary absorption section 8, the absorption liquid with a density of 1.15kg / L and a pH value of 6 is used for spraying to mainly remove SO 2 , removal rate > 90%; the absorption liquid used in the primary absorption section is a solution containing ammonium sulfite and ammonium sulfate, and the molar ratio of a...

Embodiment 3

[0045] A split-type ultra-low emission method for flue gas desulfurization and dust removal. The device described in Example 1 is used for desulfurization and dust removal. Hot flue gas enters the washing and cooling section 5 from the flue gas inlet 2, and is sprayed countercurrently with ammonium sulfate solution. The hot flue gas is cooled by adiabatic evaporation during this process. The heat of the flue gas evaporates part of the water in the solution, concentrates it to saturation, and precipitates ammonium sulfate grains. The content of the crystal slurry reaches the process control index and is transported out of the tower;

[0046] When the flue gas enters the primary absorption section 8, ammonium sulfate solution with a density of 1.1kg / L and a pH value of 5.8 is used as the absorption liquid for spraying, mainly to remove SO 2 , The removal rate is >90%; the absorption liquid used in the primary absorption section is a solution containing ammonium sulfite and ammon...

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Abstract

The invention discloses an ultralow emission method and device for split-type flue gas desulfurization and dust removal.The device comprises a desulfurization tower and an oxidization circulation tank arranged outside the desulfurization tower.The desulfurization tower and the oxidization circulation tank are connected through a pipeline.A hydromechanical combined super demister is arranged at the top of the desulfurization tower.The ultralow emission method and device for split-type flue gas desulfurization and dust removal have the advantages that the desulfurization efficiency is high (>=99%), and the adaptability to coal types and boiler load changes is high; each stage of absorption and circulation are relatively independent, the density and pH value of absorption liquid are controlled in a partitioned mode, the output of aerosol is controlled in the process, the system ammonia escape is low (<2.5 mg / Nm<3>), and the concentration of emitted particles is low (<5 mg / Nm<3>); the specific humidity electrostatic-demisting energy consumption is low, and sewage treatment is omitted; the desulfurization tower and the oxidization circulation tank are separately arranged, and thus the tower height can be reduced; the system resistance of the device is small (<2000 Pa), reasonable equipment model selection can be carried out according to different conditions of flue gas, and thus investment and energy consumption are reduced.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to an ultra-low emission method and device for desulfurization and dust removal of separated flue gas. Background technique [0002] At present, the method used for flue gas desulfurization is mainly wet desulfurization process, and with the deepening of the concept of resource recycling, the application of ammonia desulfurization process is increasing. Due to the characteristics of ammonia desulfurization itself, the flue gas after desulfurization carries fine particles including soot, absorbents, by-products, etc. The device is difficult to meet the requirements of ultra-low emissions. Most of the existing devices are built-in, that is, the oxidation circulation tank is at the bottom of the desulfurization tower, which greatly increases the height of the tower body, high energy consumption, and high operating costs. Contents of the invention [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/18B01D47/06
CPCB01D47/06B01D53/18B01D2252/10B01D2257/302
Inventor 曾子平刘应隆史晓杰
Owner ASIA PACIFIC ENVIRONMENTAL CORP
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