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Flue gas dry desulfurization process

A dry desulfurization and flue gas technology, which is applied to the adsorption and removal of flue gas gaseous pollutants and the flue gas dry desulfurization process field, can solve the problems of low efficiency, complicated solid treatment of calcium sulfate and sodium sulfate, and reaction rate between gas and solid phases. Slow and other problems, to achieve the effect of improving removal efficiency, fast adsorption speed, and improving utilization efficiency

Active Publication Date: 2020-10-16
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this method, the reaction rate between the gas phase and the solid phase is slow and the efficiency is low, and the post-treatment of the separated calcium sulfate and sodium sulfate solids is more complicated
The current ultra-low emission standard for coke oven flue gas requires SO 2 The emission limit is 30mg / m 3 , conventional dry desulfurization technology is difficult to meet this requirement

Method used

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  • Flue gas dry desulfurization process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The present invention utilizes a separate fluidized bed adsorption device and a moving bed adsorption device in the laboratory to carry out combined flue gas dry desulfurization experimental research, and the simulated non-ferrous metal smelting flue gas is provided by calcining lead sulfide ore powder in a rotary kiln. 100Nm 3 / h. After the flue gas at the outlet of the rotary kiln passes through the cooling device, it is passed through the above-mentioned flue gas dry desulfurization process, and finally the flue gas enters the bag filter, and the flue gas is dedusted by the bag filter, and the dust and powder adsorbent Filter and capture, and use the adsorbent layer accumulated on the surface of the filter bag to reduce the SO in the flue gas 2 Perform deep removal. The flue gas temperature at the outlet of the cooling device downstream of the rotary kiln is maintained at 200 °C, SO 2 The concentration is 1000mg / Nm 3 , the dust concentration is 1g / Nm 3 , the gas ...

Embodiment 2

[0037] Using the same fluidized bed and moving bed coupling device as in Example 1 to carry out the flue gas dry desulfurization process, the SO in the flue gas 2 The concentration is 1000mg / Nm 3 , spray a certain amount of powdered adsorbent (magnesium carbonate) into the pipeline, and the concentration of powdered adsorbent in the flue gas is 100mg / m 3 . The granular adsorbent is activated alumina pellets (5mm in diameter), and the moving speed of the granular adsorbent in the moving bed is 10mm / s. The velocity of the flue gas in the fluidization section is 5m / s, and after the filtration velocity of the moving bed is 1m / min through the flue gas dry desulfurization process of the present invention, the concentration of flue gas dust is 0.01g / Nm 3 , SO 2 The concentration is 50mg / Nm 3 , SO 2 The removal efficiency is about 95%.

Embodiment 3

[0039] Using the same flue gas dry desulfurization process as in Example 1 to carry out the experiment, the SO in the flue gas 2 The concentration is 1000 mg / Nm 3 , spray a certain amount of powder adsorbent (magnesium carbonate) into the pipeline, and the concentration of powder adsorbent in the flue gas is 200mg / m 3 . The granular adsorbent selects activated alumina pellets (3 mm in diameter), and the moving speed of the granular adsorbent in the moving bed is 10 mm / s. The velocity of the flue gas in the fluidization section is 5m / s, and the filtration velocity of the moving bed is 1m / min. After passing through the flue gas dry desulfurization process of the present invention, the flue gas dust concentration is 0.01g / Nm 3 , SO 2 The concentration is 30mg / Nm 3 , SO 2 The removal efficiency is about 97%.

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Abstract

The invention relates to a coke oven flue gas dry desulfurization process. Sulfur dioxide is adsorbed and efficiently removed for multiple times through coupling of a fluidized bed and a moving bed, and the process specifically comprises the following steps that (1) flue gas to be treated enters the fluidized bed, and a powder adsorbent is sprayed into the fluidized bed, and the powder adsorbent is used for carrying out preliminary adsorption on the sulfur dioxide in a fluidized state; (2) the flue gas treated by the fluidized bed enters a moving bed, a granular adsorbent is conveyed into themoving bed, and SO2 in the flue gas is continuously adsorbed by utilizing the granular adsorbent in the moving bed; (3) dust and the powder adsorbent carried in the flue gas are filtered and intercepted by utilizing the granular adsorbent on the moving bed, and SO2 in the flue gas is adsorbed by utilizing the powder adsorbent adhered to the granular adsorbent; and (4) he flue gas treated by the moving bed enters a bag type dust collector, and performing dust collection treatment on the flue gas by utilizing the bag type dust collector. Compared with the prior art, the method has the advantagethat the flue gas dry desulfurization efficiency and the desulfurizing agent utilization rate can be remarkably improved.

Description

technical field [0001] The invention belongs to the adsorption and removal technology of flue gas gaseous pollutants in the field of environmental protection, and in particular relates to a flue gas dry desulfurization process. Background technique [0002] Flue gas desulfurization (FGD) of coke oven flue gas is a necessary process in the production of domestic coking industry. The principle of desulfurization is: capture SO contained in flue gas by alkaline absorbent 2 After absorption, the gas is converted into a relatively stable sulfur compound or elemental sulfur, which is removed from the flue gas system by mechanical separation, so as to achieve the purpose of desulfurization. According to the form of sulfide absorbent and by-products, desulfurization technology can be divided into three categories: wet desulfurization, dry desulfurization and semi-dry desulfurization. Wet desulfurization is the use of liquid absorbent to wash flue gas to remove SO 2 Common wet desu...

Claims

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Application Information

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IPC IPC(8): B01D53/83B01D53/50
CPCB01D53/508B01D2251/402B01D2251/304B01D2251/404B01D2251/602B01D2251/606B01D2258/0283
Inventor 瞿赞李咸伟晏乃强石洪志黄文君刘道清李薇薇
Owner SHANGHAI JIAO TONG UNIV
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