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Semi-dry method-wet method series SO2 flue gas desulfurization process and device

A semi-dry desulfurization and desulfurization process technology, which is applied in the field of flue gas treatment equipment, can solve the problems of high desulfurization efficiency and high energy consumption in operation, and achieve the effect of increasing oxidation rate, high desulfurization efficiency, and no waste water discharge

Inactive Publication Date: 2019-04-19
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

Although high-sulfur coal has a greater price advantage than medium- and low-sulfur coal, high-sulfur flue gas discharge requires higher desulfurization efficiency, and its operating energy consumption is higher, which also limits the large-scale replacement of medium- and low-sulfur coal by high-sulfur coal. main factor

Method used

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  • Semi-dry method-wet method series SO2 flue gas desulfurization process and device
  • Semi-dry method-wet method series SO2 flue gas desulfurization process and device

Examples

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Effect test

Embodiment 1

[0045] Process A: The first-stage desulfurization adopts rotary spray desulfurization, and the second-stage desulfurization adopts wet desulfurization. The schematic diagram of the two-stage serial desulfurization process is as follows figure 1 shown.

[0046] The desulfurization device includes an electrostatic precipitator 2 , a rotary atomization desulfurization tower 7 , a bag filter 11 , a booster induced draft fan 15 and a spray desulfurization tower 24 arranged in sequence along the flow direction of the flue gas.

[0047] The bottom of the electrostatic precipitator is connected to the dust bin 3, and the rotary atomization desulfurization tower 7 is a conventional rotary spray desulfurization tower, including the tower body and the rotary sprayer 6 installed in the tower body. The desulfurizer supply device includes a desulfurizer bin A8, a slurry tank A9 and a slurry supply pump A10 arranged in sequence, and the slurry supply pump A is connected to the high-level liq...

Embodiment 2

[0058] Process B: The first stage desulfurization adopts circulating fluidized bed desulfurization, and the second stage desulfurization adopts wet desulfurization. The schematic diagram of the two-stage serial desulfurization process is as follows figure 2 shown.

[0059] Except for the semi-dry desulfurization tower, the device part is the same as that of the embodiment A.

[0060] In this embodiment, the semi-dry desulfurization tower adopts a circulating fluidized bed 32 with a circulating fluidized bed tower inlet 33 and a desulfurization ash return tower inlet 34, and the circulating fluidized bed tower inlet 33 is connected to the outlet of the electrostatic precipitator , the desulfurization ash return tower inlet 34 is connected to the desulfurization ash outlet of the bag filter 11 , the desulfurization agent bin A8 is connected to the high-level storage bin 31 , and the high-level storage bin 31 is connected to the circulating fluidized bed 32 .

[0061] high conc...

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Abstract

The invention discloses a semi-dry method-wet method series SO2 flue gas desulfurization process and device. The process includes the following steps: low-dust flue gas from a electrostatic precipitator enters a semi-dry desulfurization tower, SO2 flue gas is purified by a bag filter after first-stage desulfurization by a semi-dry desulfurization tower, the flue gas from the bag filter is pressurized by a booster fan and then sent into a wet spray desulfurization tower, the flue gas is rectified by a distributor in the tower and in countercurrent contact with spray slurry for secondary desulfurization, and the purified flue gas is discharged from a chimney after defogging; and desulfurization ash collected at the bottom of the semi-dry desulfurization tower and the bag filter is used as araw material of a desulfurization agent of the wet desulfurization tower. The series process of semi-dry and wet desulfurization towers has the advantages of being low in liquid-gas ratio, low in water consumption and energy saving, a desulfurization by-product gypsum product has high purity, and the discharge of solid waste is reduced.

Description

technical field [0001] The invention relates to a semi-dry method-wet method series desulfurization system for treating high-concentration SO 2 The flue gas process belongs to the technical field of flue gas treatment equipment. Background technique [0002] Coal accounts for about 70% of my country's primary energy, and for a long time, coal's status as the main energy source will not change. Among them, a considerable part of my country's coal reserves is high-sulfur coal, which is mainly distributed in the southwest region, and the sulfur content in the northern region is low; the sulfur content of different coal seams is different, the upper layer coal has low sulfur content, and the lower layer has high sulfur content. The average sulfur content of proven high-sulfur coal in Southwest China is 2.43%. Among them, the average sulfur content of coking coal in the Liuzhi mining area of ​​Guizhou Province is 2% to 6%, and 3 / 4 of Sichuan Province is high-sulfur coal. The av...

Claims

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Application Information

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IPC IPC(8): B01D53/80B01D50/00B01D53/50B01D53/78
CPCB01D50/00B01D53/50B01D53/78B01D53/80
Inventor 王岳军叶涛陈美秀吴忠标
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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