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Regenerative SCR denitration process and system for wet desulphurization flue gas

A wet desulfurization, regenerative technology, applied in the field of flue gas purification, can solve the problems of high tail exhaust temperature, more fuel consumption, poor economy, etc., to reduce fuel consumption, improve heat recovery rate, and reduce the total amount of fuel. Effect

Pending Publication Date: 2020-06-02
CHANGSHA HASKY ENVIRONMENTAL PROTECTION TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to this method, the temperature of the flue gas needs to be raised to close to 50°C through the hot blast stove, which requires more fuel consumption to maintain the balance of the system, which is not conducive to saving operating costs. , resulting in low flue gas waste heat utilization efficiency and waste of flue gas waste heat resources, resulting in high exhaust temperature. At the same time, the GGH heat exchanger equipment is bulky, the equipment investment cost is high, and the economy is poor in the industrial application process, resulting in The project covers a large area and the project operating cost is relatively high

Method used

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  • Regenerative SCR denitration process and system for wet desulphurization flue gas
  • Regenerative SCR denitration process and system for wet desulphurization flue gas

Examples

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Embodiment 1

[0049] A regenerative SCR denitrification process for wet desulfurization flue gas of the present invention, comprising the following steps:

[0050] S1: Connect the n regenerators 21 to the inlet of the heating chamber 10, connect the outlet of the heating chamber 10 to the inlet of the SCR denitrification device 11, divide the n regenerators 21 into N groups, n≥2, 2≤N ≤n. In this embodiment, both n and N are taken as 2. For the convenience of describing the flue gas circulation path, the regenerator 21 is divided into the first regenerator 6 (ie, the first group of regenerators) and the second regenerator 7 ( That is, the second group of regenerators). The wet desulfurization flue gas is first heated to the set SCR denitrification temperature of 350°C, and then the flue gas is transported to the first regenerator 6 for heat storage until the temperature of the flue gas discharged from the first regenerator 6 is higher than The temperature of wet desulfurization flue gas is...

Embodiment 2

[0071] A kind of application example of the regenerative SCR denitrification process and system of wet desulfurization flue gas of the present invention, the regenerative SCR denitrification system of wet desulfurization flue gas of embodiment 1 can be adopted, such as figure 1 shown, but not limited to. The smelting flue gas first passes through the conventional SNCR process furnace for preliminary denitrification, and then the flue gas from the furnace passes through the organic amine desulfurization system to remove the dust content and SO in the flue gas. 2 , the outlet flue gas conditions of the desulfurization system are as shown in Table 1, and then enter the regenerative SCR denitrification system of the present invention for denitrification, including the following steps:

[0072] Table 1 Flue gas conditions after wet desulfurization

[0073]

[0074] S1: start the system (start up), store heat for the first regenerator 6: open the ninth valve 15, the third valve ...

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Abstract

The invention discloses a regenerative SCR denitration process and system for wet desulphurization flue gas. The denitration process comprises the following steps of: communicating n regenerative chambers with a SCR denitration device through a heating chamber, dividing the n regenerative chambers into N groups, firstly conducting heat accumulation on the first group of regenerative chambers, thenconducting primary heating, secondary heating and denitration on wet desulphurization flue gas, then conducting heat accumulation on a next group of regenerative chambers through purified flue gas, and continuously conducting flue gas denitration in the mode of alternate heat accumulation and heat release. The system comprises a booster fan, the heating chamber, the SCR denitration device, a taildischarge chimney and at least two regenerative chambers, a first gas port of each regenerative chamber is communicated with the booster fan, a second gas port of each regenerative chamber is communicated with an inlet of the SCR denitration device through the heating chamber, a third gas port of each regenerative chamber is communicated with an outlet of the SCR denitration device, and a fourthgas port of each regenerative chamber is communicated with the tail discharge chimney. According to the denitration process and system provided by the invention, the waste heat of the denitrated cleanflue gas is efficiently utilized, the heat recovery rate is increased, the fuel consumption is greatly reduced, and the running cost of the system is reduced.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and relates to an SCR denitrification process and system for wet desulfurization flue gas, in particular to a low-temperature flue gas regenerative SCR denitrification process and system at the back end of wet desulfurization. Background technique [0002] The production processes in the iron and steel industry, smelting industry and other fields will produce a large amount of industrial flue gas. The nitrogen oxides and sulfur oxides contained in the flue gas are the main pollutants that form acid rain and photochemical smog, which seriously damages the ecological environment. With the increasingly stringent environmental protection standards, the emission indicators of flue gas are gradually reduced, and the comprehensive treatment of desulfurization and denitrification of industrial flue gas is urgent. [0003] Selective Catalytic Reduction of NOx (SCR denitrification process for...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/56B01D53/34
CPCB01D53/343B01D53/346B01D53/8631
Inventor 谭自强李鹏瞿浪宇梁学武
Owner CHANGSHA HASKY ENVIRONMENTAL PROTECTION TECH DEV CO LTD