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Exhaust gas treatment device and exhaust gas treatment method

A technology of exhaust gas treatment device and spray device, which is applied in the direction of separation method, chemical instrument and method, and separation of dispersed particles, which can solve the problems of ammonia hindering the operation cost and reducing the operating cost, so as to prevent the decrease of temperature, improve the removal efficiency, The effect of promoting evaporation

Active Publication Date: 2006-12-06
三菱动力环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In addition, since ammonia needs to be continuously supplied, the reduction of operating costs is hindered by the large consumption of ammonia.

Method used

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  • Exhaust gas treatment device and exhaust gas treatment method
  • Exhaust gas treatment device and exhaust gas treatment method
  • Exhaust gas treatment device and exhaust gas treatment method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0078] Below, use figure 1 The first embodiment of the present invention will be described.

[0079] This embodiment is an exhaust gas treatment device applicable to a wet desulfurization device using the caustic soda method.

[0080] figure 1 The exhaust gas treatment device according to this embodiment is shown.

[0081] The exhaust gas treatment device 1A has: a denitrification (denitration) device 7 installed in a flue 5 downstream of a boiler (combustor) 3 , an air heater 9 , a dry electric dust collector 11 , and a wet desulfurization device 13 , and dielectric gas cleaning device 15, and chimney 17.

[0082] The boiler 3 is a heavy oil combustion boiler that burns, for example, heavy oil containing a lot of sulfur.

[0083] The denitrification device 7 is a device for removing nitrogen oxides (NOx) contained in the combustion exhaust gas discharged from the boiler 3 .

[0084] The air heater 9 is a device for exchanging heat between combustion exhaust gas and combu...

no. 2 Embodiment approach

[0134] Next, use figure 2 A second embodiment of the present invention will be described.

[0135] This embodiment is an exhaust gas treatment device suitable for a wet desulfurization device using a lime-gypsum method.

[0136] In addition, the same code|symbol is attached|subjected to the same component as 1st Embodiment, and the description is abbreviate|omitted.

[0137] figure 2 The exhaust gas treatment device according to this embodiment is shown.

[0138] The exhaust gas treatment device 1B uses limestone (CaCO 3 ) as an absorbent to remove sulfur oxides. The product produced by the lime gypsum method is insoluble CaSO 4 , so it is difficult to remove SO using desulfurization wastewater as in the first embodiment 3 .

[0139] Here, in the present embodiment, a second wet desulfurization device 38 using the caustic soda method, which is smaller in scale than the wet desulfurization device 13 , is installed in the middle of the flue 5 . The second wet desulfuri...

Embodiment

[0148] use Figure 4 ~ Figure 6 , to remove SO 3 test will be described.

[0149] Figure 4 The outline of the test device is shown in .

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Abstract

An exhaust gas treatment system is provided that can sufficiently remove pollutants such as SO3 contained in combustion exhaust gas at low cost. In the exhaust gas treatment system for removing pollutants such as SO3 contained in combustion exhaust gas, there is provided dissolved salt aqueous solution sprays 35A, 35B, and 35C, that spray an Na2SO4 aqueous solution obtained from desulfurization effluent of a wet desulfurization system, into a flue though which the combustion exhaust gas flows.

Description

technical field [0001] The present invention relates to the removal of e.g. SO 3 An exhaust gas treatment device and exhaust gas treatment method for burning pollutants in exhaust gas. Background technique [0002] Sulfur trioxide (SO 3 ), hydrogen fluoride (HF), hydrogen chloride (HCl), mercury chloride (HgCl), hydrogen sulfide (H 2 S), carbon monoxide sulfide (COS) and other pollutants. When these pollutants are discharged into the atmosphere, they will have a bad impact on the environment, so they are treated to a specified concentration or less in accordance with laws or voluntary regulations. Conventionally, various exhaust treatment devices for realizing this treatment have been proposed. [0003] As an example of a pollutant, the SO 3 Be explained. [0004] SO 3 It is mainly produced by the combustion of fuels containing sulfur components (heavy oil or coal, etc.) 2 Part of it is produced by oxidation in a high-temperature environment. Therefore, SO 3 The am...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/48B01D53/68
Inventor 长安弘贡上田泰稔加贺见守男野口敏秀
Owner 三菱动力环保有限公司
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