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Fluidized bed-based flue gas combined desulfurization and denitration process

A desulfurization and denitrification, fluidized bed technology is applied in the field of low-temperature flue gas combined desulfurization and denitrification technology, which can solve problems such as affecting the removal efficiency of NOx, achieve broad application prospects, small impact, and overcome adverse effects.

Active Publication Date: 2012-06-27
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although under the action of water vapor, activated carbon can convert SO 2 Oxidized to H 2 SO 4 , but the activated carbon adsorbed sulfuric acid may be mixed with NH when it enters the upper part of the reaction tower 3 The reaction produces sulfate, which covers the surface of the catalyst and blocks the micropores of activated carbon, thus affecting the NOx removal efficiency

Method used

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  • Fluidized bed-based flue gas combined desulfurization and denitration process

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Embodiment 1

[0036] 1. Desulfurization and denitrification reaction

[0037] Dust-removed kiln flue gas (150°C, containing 800ppmSO 2 , 600ppmNO) into the desulfurization adsorption zone of the fluidized reaction tower with a total flow rate of 500L / s (flow velocity is 3m / s), and the substance used in the ammonia injection system is 16% ammoniacal liquor (mass fraction, density 0.94g / ml). NH 3 : SO 2 (Molar ratio) is 1.1:1, NH 3 : NO x (Molar ratio) was 1:1. The amount of ammonia injected is equal to the sum of the amount of ammonia consumed by the two types of acid gases. Ammonia and SO 2 The viscous substances generated by the reaction are adsorbed on the surface of the catalyst, and the mass of the particles increases and sinks into the desulfurization regeneration tank. The desulfurized "pure flue gas" undergoes a selective catalytic reduction reaction in the SCR reaction zone.

[0038] 2. Catalyst regeneration

[0039] Rinse the surface of the granular catalyst with deionized...

Embodiment 2

[0045] 1. Desulfurization and denitrification reaction

[0046] Dust-removed kiln flue gas (200°C, containing 500ppmSO 2 , 600ppmNO) into the desulfurization adsorption zone of the fluidized reaction tower with a total flow rate of 1000L / s (flow velocity is 6m / s), and the material used in the ammonia injection system is 20% ammonium carbonate solution. NH 3 : SO 2 (Molar ratio) is 1.5:1, NH 3 : NO x (Molar ratio) was 1.2:1. The amount of ammonia injected is equal to the sum of the amount of ammonia consumed by the two types of acid gases. Ammonia and SO 2 The viscous substances generated by the reaction are adsorbed on the surface of the catalyst, and the mass of the particles increases and sinks into the desulfurization regeneration tank. The desulfurized "pure flue gas" undergoes a selective catalytic reduction reaction in the SCR reaction zone.

[0047] 2. Catalyst regeneration

[0048] Rinse the surface of the granular catalyst with deionized water to remove solub...

Embodiment 3

[0054] 1. Desulfurization and denitrification reaction

[0055] Dust-removed kiln flue gas (180°C, containing 200ppmSO 2 , 500ppmNO) enter the desulfurization adsorption zone of the fluidized reaction tower with a total flow rate of 700L / s (flow velocity is 4.2m / s), and the substance used in the ammonia injection system is 4% ammoniacal liquor (mass fraction, density 0.98g / ml). NH 3 : SO 2 (Molar ratio) is 1.8:1, NH 3 : NO x (Molar ratio) was 1.1:1. The amount of ammonia injected is equal to the sum of the amount of ammonia consumed by the two types of acid gases. Ammonia and SO 2 The viscous substances generated by the reaction are adsorbed on the surface of the catalyst, and the mass of the particles increases and sinks into the desulfurization regeneration tank. The desulfurized "pure flue gas" undergoes a selective catalytic reduction reaction in the SCR reaction zone.

[0056] 2. Catalyst regeneration

[0057] Rinse the surface of the granular catalyst with deion...

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Abstract

The invention discloses a fluidized bed-based flue gas combined desulfurization and denitration process. An ammonia-containing reducing agent and flue gas after dust removal are subjected to gas-phase desulfurization reaction at a desulfurization region; ammonia and sulfur dioxide react under the action of vapor to generate ammonium sulfite and ammonium bisulfite to be adsorbed by an SCR (Selective Catalytic Reduction) denitration catalyst; desulfurized flue gas is subjected to SCR denitration reaction of the ammonia-containing reducing agent and nitrogen oxide at the SCR reaction region; and after being desulfurized, regenerated and activated, catalyst grains are circulated back to the SCR reaction region to be reutilized. The invention discloses a device for implementing the process. Through the process, liquid-state sectional desulfurization and denitration are realized in a fluidized reaction tower, so that adverse effect of the sulfur dioxide in medium and low-temperature flue gas on SCR catalytic desulfurization is overcome; and the process is suitable for desulfurization and denitration of low-temperature and high-sulfur flue gas of industrial boiler kiln and has broad market application prospect.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, and relates to a low-temperature flue gas combined desulfurization and denitrification process based on a circulating fluidized bed. Background technique [0002] my country is the largest coal producer and consumer in the world. Coal still accounts for a large proportion of my country's energy structure. It is estimated that coal will still account for about 70% of total energy consumption in the next 10 years. The resulting nitrogen Oxide will pose great harm to human beings and the environment. Among them, in the iron and steel, nonferrous metallurgy, chemical industry, building materials and other industries, the annual emission of nitrogen oxides exceeds 7 million tons. At the same time, in the second opinion draft of the coal-fired power plant pollutant discharge standard promulgated by the state, there are strict regulations on the NOx emission of coal-fired boilers: the maxi...

Claims

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Application Information

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IPC IPC(8): B01D53/90B01D53/50B01D53/56
Inventor 王岳军刘伟莫建松吴忠标
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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