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Belt type pellet roasting flue gas desulfurization and denitrification system and method

A desulfurization, denitrification and flue gas technology, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of low desulfurization efficiency, less floor space, less investment in semi-dry desulfurization process, and reduce NOx concentration. And the effect of sulfur oxide concentration, reducing fuel cost and improving treatment effect

Inactive Publication Date: 2020-06-19
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the wet desulfurization process has complex system, huge equipment, large water consumption and high one-time investment, and is generally suitable for large-scale power plants; the dry desulfurization process has low utilization rate of absorbent, low desulfurization efficiency, and fly ash is mixed with desulfurization products. Seriously affects the comprehensive utilization of by-products, and has high requirements for automatic control of the drying process; the semi-dry desulfurization process has low investment, low operating costs, low corrosion, small footprint, reliable process, and has a good development prospect

Method used

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  • Belt type pellet roasting flue gas desulfurization and denitrification system and method

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Embodiment 1

[0070] This embodiment provides a preferred technical solution of the flue gas desulfurization and denitrification system for belt-type pellet roasting of the present invention, including a belt-type roasting unit, an SCR denitrification device 12, an oxidation denitrification device, a desulfurization device 14, a dust removal unit and a chimney 15 .

[0071] The dust removal unit includes a first dust removal device 8 , a second dust removal device 9 , a third dust removal device 10 and a fourth dust removal device 11 .

[0072] The belt roasting unit includes a belt roaster and a supporting gas conveying device, and the belt roaster includes a blast drying section 1, a draft drying section 2, a preheating section 3, a roasting section 4, and a soaking section arranged in sequence. Section 5, the first cooling section 6 and the second cooling section 7.

[0073] The gas conveying device independently transports the external cold source to the first cold section 6 and the se...

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Abstract

The invention provides a belt type pellet roasting flue gas desulfurization and denitrification system and method, the system is reasonably provided with a gas flow channel, nitrogen oxide, sulfur oxide and particles in flue gas are treated according to the characteristics of each section of flue gas, and flue gas waste heat is effectively utilized. According to the system, a gas flow channel is reasonably arranged, coke oven gas serves as fuel, the purpose of roasting pellets is achieved, and the fuel cost is reduced. The system can remarkably reduce the concentration of NOx and the concentration of sulfur oxide in exhausted flue gas, the dust removal efficiency is high, iron-containing dust is recycled, and flue gas pollutants can meet the requirement for ultralow emission.

Description

technical field [0001] The invention belongs to the technical field of waste gas treatment, and relates to a flue gas desulfurization and denitrification system and method, in particular to a belt-type pellet roasting flue gas desulfurization and denitrification system and method. Background technique [0002] Sinter is an irregularly shaped porous lump and requires the addition of fuel to the batch. Pellets are regular-shaped balls with small and uniform particle size, which is beneficial to the improvement of the air permeability of the blast furnace material column and the uniform distribution of air flow; the cold strength (compression and abrasion resistance) is high, convenient for transportation, loading and unloading and storage, and less powder ; The high iron content and high bulk density of the pellets are beneficial to increase the effective weight of the blast furnace material column, increase the output and reduce the coke ratio; the pellets have good reducibil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/80B01D53/86B01D53/90B01D53/56B01D53/76B01D53/50
CPCB01D53/50B01D53/75B01D53/76B01D53/80B01D53/8631B01D53/90B01D2258/0283
Inventor 朱廷钰刘霄龙刘法高
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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