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Multi-layer fluidized bed two-stage activated carbon/coke flue gas simultaneous-desulfurization and denitrification system and method

A multi-layer fluidized bed, desulfurization and denitrification technology, applied in the field of multi-layer fluidized bed two-stage activated carbon/coke flue gas simultaneous desulfurization and denitrification system, can solve the problems that hinder the popularization and application of activated carbon/coke desulfurization and denitrification process, discontinuous operation, Problems such as high pressure drop

Active Publication Date: 2016-07-06
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] To sum up, the current domestic and foreign activated carbon / coke flue gas purification processes are mainly fixed bed and moving bed processes. Among them, the fixed bed process has many shortcomings and is mainly designed for flue gas desulfurization. Small size, parallel connection of equipment causes problems such as large space occupation, discontinuous operation, high pressure drop, frequent switching of adsorption and regeneration; while the disadvantages of the moving bed process are poor mass transfer and heat transfer effects, high pressure drop, serious wear of active coke, and high High-strength shaped activated coke has high cost, which hinders the popularization and application of activated carbon / coke desulfurization and denitrification process

Method used

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  • Multi-layer fluidized bed two-stage activated carbon/coke flue gas simultaneous-desulfurization and denitrification system and method
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  • Multi-layer fluidized bed two-stage activated carbon/coke flue gas simultaneous-desulfurization and denitrification system and method

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Embodiment 1

[0085] Such as figure 1 As shown, the desulfurization and denitrification multilayer fluidized bed reactor 13 is a three-layer overflow tube multilayer fluidized bed, the uppermost two layers (ie, the first and second layers) of the fluidized bed are used for denitrification, and the third layer is fluidized The bed is used for desulfurization, and two adjacent fluidized beds are separated by a distribution plate 9. After regeneration, activated carbon / coke and fresh activated carbon / coke are fed into the first layer of fluidized bed through activated carbon / coke conveyor 1B, and the activated carbon / coke is transported In device 1B, activated carbon / coke pre-adsorbs part of the ammonia gas, and at the same time, ammonia gas is injected under the distribution plate of the first fluidized bed. Contact to further remove NO from the flue gas x , the activated carbon / coke particles that have initially participated in the denitrification enter into the second fluidized bed through...

Embodiment 2

[0087] Such as image 3 shown, with figure 1 the difference is image 3 A ammonia pre-adsorption reactor 17 is added in the reactor, and the pre-adsorption of ammonia is completed in the reactor 17. The activated carbon / coke conveyor 1B firstly feeds the regenerated activated carbon / coke and fresh activated carbon / coke continuously into the ammonia pre-adsorption reactor 17, introduces a part of the ammonia gas into the ammonia pre-adsorption reactor, and sends the activated carbon / coke after adsorbing ammonia to the ammonia pre-adsorption reactor 17. into the desulfurization and denitrification multilayer fluidized bed reactor 13. Adding an ammonia pre-adsorption reactor can make the activated carbon / coke surface adsorb ammonia in advance and improve the denitrification efficiency. Preferably, the ammonia pre-adsorption reactor is a moving bed reactor.

Embodiment 3

[0089] Such as Figure 4 shown, with figure 1 The difference is that the desulfurization and denitrification multilayer fluidized bed reactor 13 does not have an overflow pipe inside, and directly adopts the form of a porous plate, and the activated carbon / coke particles flow down to the next fluidized bed through the holes on the distribution plate 9, and the distribution plate The porosity is 20% to 50%, depending on the residence time of activated carbon / coke.

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Abstract

The invention relates to the field of industrial flue gas pollution control. A multi-layer fluidized bed two-stage activated carbon / coke flue gas simultaneous-desulfurization and denitrification system of the invention comprises a dust removal device (4) and further comprises a desulfurization and denitrification multi-layer fluidized bed reactor (13), wherein a feed port of the dust removal device (4) is communicated with the top of the desulfurization and denitrification multi-layer fluidized bed reactor (13); the desulfurization and denitrification multi-layer fluidized bed reactor (13) is divided into an upper denitrification section and a lower desulfurization section; the denitrification section comprises several layers of fluidized beds; an ammonia gas injection port (10) is formed in a side wall corresponding to a position below the bottom of each layer of fluidized bed; the desulfurization section comprises several layers of fluidized beds; a flue gas inlet (7) is formed in the side wall corresponding to the position below the bottom of a lowest layer of fluidized bed. The system provided by the invention can enhance the mass transfer and heat transfer, improve the efficiency of desulfurization and denitrification, replace high-cost formed activated carbon / coke with fine granular activated carbon / coke to reduce the costs for desulfurization and denitrification, and is suitable for the flue gas purification of power plant boilers, industrial boilers, heating boilers and coking industry.

Description

technical field [0001] The invention relates to the field of industrial flue gas pollution control, in particular, the invention relates to a multi-layer fluidized bed two-stage activated carbon / coke flue gas simultaneous desulfurization and denitrification system and method. Background technique [0002] Flue gas emitted from fossil fuel combustion and metal smelting processes contains SO x and NO x Environmental problems such as smog, acid rain, and photochemical smog caused by these flue gas pollutants seriously endanger human health and living environment, so they have attracted widespread attention from all over the world. In this context, a variety of flue gas desulfurization and denitrification methods and technologies have emerged. [0003] Activated carbon / coke (referred to as AC) simultaneous desulfurization and denitrification technology uses activated carbon / coke made of coal or biomass as a desulfurization adsorbent and denitrification catalyst to simultaneous...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/76B01D53/86B01D53/56
CPCB01D53/12B01D53/56B01D53/75B01D53/76B01D53/8631B01D2251/2062B01D2253/102B01D2257/302
Inventor 高士秋余剑李运甲郭凤李长明
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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