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A desulfurization and denitrification process for boiler flue gas

A technology for desulfurization and denitrification and boiler flue gas, which is applied in the field of desulfurization and denitrification process, and can solve the problems of many equipments, long working hours of operators, and high construction and use costs

Inactive Publication Date: 2020-10-20
SHANGHAI BODAN ENVIRONMENTAL ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a desulfurization and denitrification process for boiler flue gas to solve the problems raised in the above-mentioned background technology: in the prior art, simultaneous desulfurization and denitrification cannot be performed in the same reaction tower, and two processing sections need to be established. Many equipments, large land occupation, long working hours of operators, and high construction and use costs

Method used

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  • A desulfurization and denitrification process for boiler flue gas
  • A desulfurization and denitrification process for boiler flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] see Figure 1-2 , a boiler flue gas desulfurization and denitrification system, comprising a low-temperature flue gas spray wet method integrated desulfurization and denitration reaction tower and a desulfurization and denitrification slurry regeneration cycle system; the low-temperature flue gas spray wet method integrated desulfurization and denitrification reaction tower includes a dust removal Layer 4, defogging layer 5, spray layer 6 and slurry pool 15; the desulfurization and denitrification slurry regeneration cycle system includes reduction pool 16, acid pool 18, alkali pool 19 and aeration tank 20;

[0033]The structure of the low-temperature flue gas spray wet method integrated desulfurization and denitrification reaction tower is a columnar tower body, and the top of the low temperature flue gas spray wet method integrated desulfurization and denitrification reaction tower is connected with an outlet pipe 3 through a flange, and the outlet pipe 3 passes throug...

Embodiment 2

[0047] The different parameters of this embodiment and embodiment 1 are:

[0048] a. The diameter of the main body of the integrated desulfurization and denitrification reaction tower with low-temperature flue gas spraying wet method is 5m, the height of the low-temperature flue gas spraying wet method integrated desulfurization and denitrification reaction tower is 20m, and the volume of the slurry pool 15 is 80m 3 The low-temperature flue gas spray wet method integrated desulfurization and denitrification reaction tower is equipped with a spray layer 6 of a three-layer spray device at a height of 16m, and the low temperature flue gas spray wet method integrated desulfurization and denitrification reaction tower is installed at a height of 18m. There is a demisting layer 5, and a dedusting layer 4 is provided at a tower height of 19m in the integrated desulfurization and denitrification reaction tower with low-temperature flue gas spraying wet method;

[0049] b. Boiler flue ...

Embodiment 3

[0055] The difference with embodiment 2 is:

[0056] a. Boiler flue gas intake 300000Nm 3 / h, superficial flow velocity 5m / s, flue gas inlet temperature 150℃, sulfur dioxide content 2000mg / m 3 , nitrogen oxide content 500mg / m 3 , wherein nitric oxide accounts for more than 80% of the total nitrogen oxides;

[0057] b. In the total desulfurization and denitrification slurry, the concentration of ammonium sulfite is 15wt%, and the concentration of ferrous sulfate heptahydrate is 9.9wt% (still calculated, the concentration of ferrous sulfate is 5.5wt%).

[0058] Others are all the same as in Example 2.

[0059] 30d operation results show that the daily processing capacity is 1800000Nm 3 In the case of boiler flue gas, the treatment gas volume per ton of slurry is about 80000Nm 3 (exhaust gas) / t(zeolite). It treats the SO of exhaust gas 2 Emission concentration≤30mg / Nm 3 , NOx Emission concentration≤45mg / Nm 3 , soot emission concentration ≤ 8mg / Nm 3 Meet the "Shandong Pr...

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Abstract

The invention discloses a desulfurization and denitrification process for boiler smoke. The desulfurization and denitrification process comprises the following steps: (1) boiler smoke enters a low-temperature smoke spraying wet-type integrated desulfurization and denitrification reaction tower from air inlets in the middle lower parts of the reaction tower and is in contact with desulfurization and denitrification slurry sprayed from a spraying layer to react in a rising process, the liquid gas ratio is controlled at 5L / m<3>-20L / m<3>, sulfur dioxide and nitric oxide in the smoke are absorbed, the smoke and the desulfurization and denitrification slurry fall back into a slurry tank, other gas continues to rise to pass through a demisting layer and a dust removal layer, enters a chimney through a gas outlet pipe and is discharged; (2) when the concentration of ammonium sulfite in the slurry which absorbs sulfur dioxide and nitric oxide is lower than 4wt%, the slurry is regenerated; and (3) the slurry is regenerated. The desulfurization and denitrification process is high in desulfurization and denitrification rates and good in treatment effect to existing boiler smoke, required absorbing slurry can be rapidly regenerated and reused, the comprehensive cost is low, and ultralow gas and liquid emission can be realized.

Description

technical field [0001] The invention relates to a desulfurization and denitrification process, in particular to a desulfurization and denitrification process for boiler flue gas. Background technique [0002] Air pollution is one of the most serious problems facing the survival and development of human society in the 21st century. With the development of industrialization and urbanization, the treatment of waste gas, especially the treatment of sulfur oxides and nitrogen oxides, has become an urgent task. . [0003] Sulfur oxides and nitrogen oxides can lead to the formation of acid rain, which is characterized by a large amount of pollutants and a wide range of pollution, resulting in regional environmental acidification. It causes great harm: such as seriously affecting the ecosystem, making lakes acidic, affecting the growth and reproduction of fish and other aquatic organisms and even causing their death; causing soil acidification, crop production reduction, and forest...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/80B01D53/60B01D53/96B01D46/02
CPCB01D46/02B01D53/60B01D53/80B01D53/96B01D2258/0283Y02A50/20
Inventor 朱双波范佳奇陆绍飞
Owner SHANGHAI BODAN ENVIRONMENTAL ENG TECH