Ammonia process type double-cycle desulfurization and denitrification dust removal system

A technology for desulfurization, denitrification, and dust removal systems, which is applied in separation methods, chemical instruments and methods, and dispersed particle separation, etc., can solve the problems of inability to meet environmental protection standards, tailing of flue gas, and high density of absorption liquid, and improve the utilization rate of ammonia in the system. , Improve the stripping efficiency, reduce the effect of ammonia release

Inactive Publication Date: 2015-12-30
ASIA PACIFIC ENVIRONMENTAL CORP
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AI Technical Summary

Problems solved by technology

[0004] Affected by factors such as the improvement of emission standards and changes in the quality of coal-fired coal, when the flue gas SO 2 When the concentration is high (≥4000mg / Nm 3 ), when the desulfurization rate is high (>99%), ammonia desulfurization adopts a single-stage absorption process, the operating pH value of the absorption liquid is high, the density of the absorption liquid is high, the oxidation rate of the system is low, and it is easy to cause aerosol generation and the concentration of discharged particulate matter High (>20mg / Nm 3 ), the tailing phenomenon of flue gas at the outlet of the desulfurization device is serious, which cannot meet the emission requirements
Simply increase the spray layer in the internal desulfurization tower to increase SO 2 The absorption rate can no longer meet the current environmental protection standards, and the traditional technology must be improved and innovated to develop a double-cycle desulfurization, denitrification and dust removal technology

Method used

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  • Ammonia process type double-cycle desulfurization and denitrification dust removal system

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Effect test

Embodiment 1

[0040] Such as figure 1 As shown, an ammonia double-cycle desulfurization, denitrification and dust removal system includes a washing absorption tower 1 and an oxidation circulation tank 9; the washing absorption tower 1 is sequentially composed of a high-efficiency water mist removal section 2, an enhanced ammonia mist removal section 3, and an absorption liquid demisting section Section 4, secondary absorption section 5, primary absorption section 6, washing and cooling section 7; oxidation circulation tank 9 is composed of oxidation section 10, secondary absorption liquid circulation section 11 and primary absorption liquid circulation section 12 in turn;

[0041] The oxidation section 10 communicates with the washing and cooling section 7 through pipelines; the secondary absorption liquid circulation section 11 communicates with the secondary absorption section 5 through pipelines; the primary absorption liquid circulation section 12 communicates with the primary absorption...

Embodiment 2

[0051] The method for desulfurization, denitrification and dust removal of the above-mentioned system includes the following steps:

[0052] SO 2 Concentration≥4000mg / Nm 3 The hot flue gas with a temperature of 120°C to 180°C enters the washing and cooling section 7 from the flue gas inlet pipe 8, and is washed in countercurrent contact with the ammonium sulfate solution containing ammonium nitrate, and then enters the main SO removal 2 The primary absorption section 6) is absorbed by the countercurrent spraying of the absorption liquid, and then enters into the auxiliary SO removal 2 The second-level absorption section 5 uses the absorption liquid to continue spraying and absorbing to purify the flue gas; then enters the absorption liquid demist section 4 for demisting, then enters the enhanced ammonia mist removal section 3, and then enters the high-efficiency water mist removal section 2.

[0053] When the flue gas enters the primary absorption section 6, the ammonium sul...

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Abstract

The invention discloses an ammonia process type double-cycle desulfurization and denitrification dust removal system and belongs to the technical field of environmental protection equipment. The system comprises a cleaning absorbing tower and an oxidation circulation tank, wherein the cleaning absorbing tower sequentially comprises an efficient water mist removal section, a reinforced ammonia mist removal section, an absorption liquid mist removal section, a secondary absorption section, a primary absorption section and a cleaning cooling section; the oxidation circulation tank sequentially comprises an oxidation section, a secondary absorption liquid circulation section and a primary absorption liquid circulation section; the oxidation section is communicated with the cleaning cooling section through a pipeline; the secondary absorption liquid circulation section is communicated with the secondary absorption section through a pipeline; the primary absorption liquid circulation section is communicated with the primary absorption section through a pipeline. The system has the advantages that the desulfurization efficiency is high, generation of ammonia escape, aerosol and particulate matters is reduced from the start and blocked in the process, and the system has high adaptability to coal types and boiler load changes, occupies small area and is compact in arrangement and simple to mount and requires less investment.

Description

technical field [0001] The invention relates to the technical field of environmental protection equipment, in particular to an ammonia-based double-cycle desulfurization, denitrification and dust removal system. Background technique [0002] my country's sulfur dioxide emissions are huge, causing serious pollution to the atmospheric environment. The emissions rank first in the world, exceeding the self-purification capacity of my country's atmospheric environment. The area with an annual precipitation pH value of less than 5.6 accounts for about 40% of the country's land area, causing huge economic losses. , Seriously affect my country's ecological environment and people's health. SO 2 Emissions and the formation of acid rain mainly come from industries such as coal-burning, metallurgy, and chemical industry. [0003] With the development of economy and technology and the deepening of the concept of circular economy, the ammonia method highlights its advantages, with high d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50B01D53/86B01D53/56
Inventor 曾子平周锡飞杨超
Owner ASIA PACIFIC ENVIRONMENTAL CORP
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