Device for semi-dry desulfurization, dust removal and low-temperature denitration of coke oven flue gas and technological method thereof

A semi-dry desulfurization and low-temperature denitrification technology, which is applied in the field of flue gas purification equipment, can solve the problems of cross-leakage between carbonization chamber and combustion chamber, high investment and operation costs, and low concentration of sulfur dioxide, achieving remarkable social and economic benefits , Low investment costs, low operating costs

Inactive Publication Date: 2019-02-15
青岛天正洁能环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the long-term operation of coking enterprises, the leakage between the carbonization chamber and the combustion chamber may be caused, which will cause the tar content in the flue gas to be too high. The failure of the catalyst by tar is irreversible. cause great economic loss
[0006] At present, some enterprises have adopted low-temperature SCR denitrification technology + wet desulfurization technology, but they all ended in failure due to catalyst poisoning. Although wet desulfurization is more efficient than dry and semi-dry desulfurization, the investment and operating costs are very high. A large amount of waste water is produced, while the concentration of sulfur dioxide in the coke oven flue gas is relatively low, and the concentration of sulfur dioxide in the flue gas is 200-250mg / Nm 3 , should not use wet desulfurization

Method used

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  • Device for semi-dry desulfurization, dust removal and low-temperature denitration of coke oven flue gas and technological method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 As shown, the coke oven flue gas semi-dry desulfurization, dust removal and low-temperature denitrification device described in the present invention includes: coke oven 1, flue 2, semi-dry desulfurization tower 3, rotary atomizer 4, absorbent Powder bin 5, screw weighing scale 6, process water tank 7, process water pump 8, slurry tank 9, slurry storage tank 10, slurry delivery pump 11, ash unloading valve at the bottom of the tower 12, scraper conveyor 13, bag filter 14, SCR reactor 15, ammonia water tank 16, ammonia water pump 17, ammonia water evaporation mixer 18, low temperature catalyst 19, induced draft fan 20, chimney 21, screw conveyor 22, bucket elevator 23, ash storage 24, ash discharge valve 25.

[0029]In the above device, the coke oven 6, the semi-dry desulfurization tower 3, the bag filter 14, the SCR reactor 15, the induced draft fan 20 and the chimney are connected in sequence through the flue. The rotary atomizer 4 is installed on the...

Embodiment 2

[0035] The technical method of coke oven flue gas semi-dry desulfurization, dust removal and low temperature denitrification device of the present invention comprises the following steps:

[0036] Step 1: The coke oven flue gas from the tail of the coke oven 1 is sent into the desulfurization tower through the flue 2, and the absorbent slurry is pumped into the rotary atomizer 4 at the top of the absorption tower;

[0037] Step 2: In the absorption tower, the absorbent atomized into fine liquid droplets is mixed with the flue gas and contacts with the SO in the flue gas 2 A chemical reaction occurs to generate sulfate, SO in the flue gas 2 At the same time, the moisture brought in by the absorbent is quickly evaporated and dried, and the temperature of the flue gas decreases accordingly;

[0038] Step 3: Part of the desulfurization reaction product and a small amount of unused desulfurization absorbent are discharged from the outlet of the cone at the bottom of the desulfuriz...

Embodiment 3

[0047] Suppose there is a 5.5m coke oven with a flue gas flow rate of 120000Nm 3 / h emission, the flue gas temperature can reach 270°C, and the sulfur dioxide concentration in the flue gas is 200mg / Nm 3 , nitrogen oxide concentration 800mg / Nm 3 , dust concentration 40mg / Nm 3 , moisture content 15%. The desulfurization absorbent is slaked lime, and the denitrification reducing agent is 25% ammonia water.

[0048] Such as figure 1 As shown, the 270°C flue gas from the coke oven 1 enters the semi-dry desulfurization tower 3 through the flue 2, and the lime stored in the absorbent powder bin 5 is sent to the pulping tank 9 through the screw weighing scale 6, and the process water tank The process water in 7 is sent to the slurry tank 9 through the process water pump 8 to make slaked lime milk, which flows into the slurry storage tank 10, and the slaked lime milk is pumped into the rotary atomizer 4 located in the absorption tower by the slurry delivery pump 11. In the absorpt...

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Abstract

The invention relates to a device for semi-dry desulfurization, dust removal and low-temperature denitration of coke oven flue gas and a technological method thereof, belongs to the technical field ofneed of flue gas purifying devices. The device comprises a coke oven, a semi-dry desulfurization tower, a bag-type dust remover, an SCR reactor, aninduced draft fan and a chimney which are sequentially connected through a flue, wherein a rotary atomizer is mounted on the top of the semi-dry desulfurization tower; a tower bottom ash discharging valve is mounted at a conical hopper of the semi-drydesulfurization tower; a screw conveyor is mounted at the bottom of the bag-type dust remover and is connected with an ash silo through a scraper conveyor and a bucket elevator; and an ash dischargingvalve is arranged on an ash hopper at the lower part of the ash silo. By a rotary spraying semi-dry desulfurization technology, no wastewater is discharged, desulfurization slag has a stable market channel, and an environmental protection problem is completely solved; during discharge, no white mist tailing phenomenon is caused; and the service life of a low-temperature catalyst is prolonged. Thedevice can be widely applied to occasions where the flue gas purifying devices are needed, and is especially applicable to the field of low-temperature denitrification, desulfurization and dust removal in the coke oven, a garbage incinerator, an industrial kiln and the like.

Description

technical field [0001] The invention relates to a coke oven flue gas semi-dry desulfurization, dust removal and low-temperature denitrification device and a process method thereof, belonging to the technical field of flue gas purification devices. Background technique [0002] At present, the coke oven waste gas used for coke oven heating in the production of coke ovens in the domestic coking industry is collected through the main flue and discharged directly to the atmosphere through the chimney. The air pollutants emitted by the coke oven chimney are the waste gas produced after the combustion of coke oven gas, mainly SO 2 , NO x It is one of the most polluting industries. [0003] In June 2012, the Ministry of Environmental Protection and the State Administration of Quality Supervision, Inspection and Quarantine jointly issued the "Emission Standards for Pollutants in the Coking Chemical Industry" (GB16171-2012), which clearly stipulates the emission standards for air p...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/56B01D53/14B01D46/02
CPCB01D53/1481B01D46/02B01D53/1493B01D53/8621B01D2251/2062B01D2252/10B01D2258/0283
Inventor 李帅俊张效伟
Owner 青岛天正洁能环保科技有限公司
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