Wide-load denitration method and device

A load and denitrification technology, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of SCR denitrification system inoperability, induced draft fan overload operation, air preheater blockage and corrosion, etc., to achieve outstanding environmental and environmental protection Social benefits, avoiding clogging and corrosion, and convenient operation

Pending Publication Date: 2019-09-20
SHANGHAI DEFOG ENVIRONMENTAL SCI & TECH
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  • Abstract
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Problems solved by technology

[0006] The object of the present invention is to provide a wide-load denitrification method and device, using the method and device of the present invention, can realize NOx under wide-load X Ultra-low emissions, solving the problem that the SCR denitrification system cannot operate under low load in coal-fired power plants, NO X The problem of excessive emission; at the same time, it can avoid the blockage and corrosion of the air preheater, as well as the problem of overload operation of the induced draft fan

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  • Wide-load denitration method and device

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Embodiment 1

[0034] This embodiment 1 provides a wide-load denitrification method, which will contain NO X The flue gas is passed into the low-temperature plasma reaction device, and the NO X Add a preset proportion of O to the flue gas 2 , using plasma technology to react the gas in a low-temperature plasma device to obtain N 2 , NO 2 , N 2 o 5 , get NO 2 , N 2 o 5 Pass into the absorption device and react with water to generate HNO 3 、HNO 2 And removal, the purified flue gas is discharged into the atmosphere through the chimney;

[0035] Among them, NO X X in is 1 or 2.

[0036] NO XThe conversion efficiency is related to the power of the plasma power supply in the low-temperature plasma device. Preferably, the power of the plasma power supply in the low-temperature plasma device is 1 to 40W / Nm 3 , preferably 1-5W / Nm 3 .

[0037] NO in boiler flue gas X Mainly composed of NO and NO 2 composition, where NO accounts for NO X More than 95% of the total is its main componen...

Embodiment 2

[0077] see figure 1 , this embodiment provides a wide-load denitrification device, including: a gas delivery system, a first flue gas emission continuous monitoring system 8, a low-temperature plasma reaction device 1, a second flue gas emission continuous monitoring system 15, and an absorption device. The absorption device of the embodiment adopts the wet desulfurization device 9;

[0078] Among them, the flue gas enters the low-temperature plasma reaction device 1 through the gas delivery system for reaction, and the reacted gas enters the wet desulfurization device 9 for a synergistic reaction and then is discharged into the atmosphere through the chimney;

[0079] After the gas delivery system and before the low-temperature plasma reaction device 1, a first flue gas emission continuous monitoring system 8 is arranged, and after the absorption device, a second flue gas emission continuous monitoring system 15 is arranged;

[0080] The gas delivery system includes O 2 Gas t...

Embodiment 3

[0088] refer to figure 2 The difference between this embodiment and Embodiment 1 is that in this embodiment, the absorption device adopts a semi-dry desulfurization device 10, and only the top of the tower of the semi-dry desulfurization device 10 is provided with nozzles for spraying desulfurization slurry. The dry desulfurization device 10 is used to provide a reaction environment for free water, which is used to cooperatively absorb and remove NO produced by the low-temperature plasma reaction device 1 2 , N 2 o 5 , and finally achieve NO X The ultra-low emission, the second is used for the removal of sulfur compounds in the flue gas.

[0089] In summary, the method and device of the present invention completely replace the traditional SCR denitrification technology by using plasma technology. Compared with the traditional SCR denitrification technology, it is not affected by unit load and flue gas temperature, and the denitrification efficiency can reach more than 90%....

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Abstract

The invention discloses a wide-load denitration method and device. The method comprises the following steps: feeding smoke containing NOX into a low-temperature plasma reaction device, adding O2 to the smoke containing the NOX, after adding the O2, wherein a volume fraction of the O2 is 3%-10%, enabling a gas to react in the low-temperature plasma reaction device by using a plasma technology, to obtain N2, NO2 and N2O5, feeding the obtained NO2 and N2O5 into an absorption device and reacting with water to generate HNO3 and HNO2 and removing, and enabling the purified smoke to be discharged into the atmosphere through a chimney. The device comprises a gas conveying system, a smoke emission continuous monitoring system, the low-temperature plasma reacting device and the absorption device. The method and device are used for realizing NOX ultralow emission under wide-load, and solving problems that an SCR denitration system of a coal-fired power plant cannot be normally operated under low-load, and the NOX emission exceeds a standard; and avoiding problems that an air preheater is blocked and corroded, and an induced draft fan is operated under overload.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a wide-load denitrification method and device. Background technique [0002] According to the requirements of the "Comprehensive Implementation of Ultra-low Emissions and Energy-Saving Transformation Work Plan for Coal-fired Power Plants" by the three national ministries and commissions, by 2020, coal-fired generating units of 300,000 kilowatts and above in the country must achieve ultra-low emissions, and the concentration of nitrogen oxide emissions should not exceed 50mg / N m 3 . [0003] Selective catalytic reduction (SCR) technology is currently a widely used denitrification technology. Its principle is that under the action of a catalyst, the NH 3 As a reducing agent, it preferentially interacts with NO in the flue gas X Reduction produces nitrogen and water. The optimal reaction temperature of the SCR device is 300°C to 400°C. In order to m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/76B01D53/78B01D53/32B01D53/56
CPCB01D53/75B01D53/32B01D53/56B01D53/78B01D53/76B01D2258/0283B01D2251/102B01D2259/818
Inventor 戴永阳吴永杰傅懋
Owner SHANGHAI DEFOG ENVIRONMENTAL SCI & TECH
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