Method for oxidizing and denitrating ozone containing industrial waste gas HCl

A technology for industrial waste gas and ozone oxidation, which is applied to chemical instruments and methods, separation methods, and separation of dispersed particles, can solve the problems of large investment, high operating costs, and low reaction temperature, and achieve low investment, low operating costs, and high efficiency. high effect

Inactive Publication Date: 2008-10-01
林涛
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main disadvantages of the SNCR method are: ① high requirements for pipelines and equipment, and high cost; ② large consumption of reducing agent and high energy consumption, unless the industrial waste gas itself has extremely high temperature; ③ low denitrification efficiency of waste gas, only 40-50%; Compared with the SNCR method, the SCR method has the advantages of high denitrification efficiency, generally up to 80% or more, and low reaction temperature, but there are still the following disadvantages in actual use: ① High requirements for pipelines and equipment, The cost is expensive and the investment is large; ②Due to the NH 3 There will be errors in the amount of metering control added, which will easily cause secondary pollution; ③ easy to leak, di

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  • Method for oxidizing and denitrating ozone containing industrial waste gas HCl
  • Method for oxidizing and denitrating ozone containing industrial waste gas HCl

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] It is a process of injecting ozone oxidation into the industrial waste gas tower combined with wet scrubbing and denitrification. figure 1 .

[0026] Firstly, the industrial waste gas (10000m 3 / h, containing HCl 1×10 5 mg / m 3 , containing NO X 5×10 4 mg / m 3 ) introduce a water-washing absorption tower 3 that removes HCl through the exhaust gas delivery pipeline 2, and the spray flow rate in the water-washing absorption tower 3 is 50m 3 / h water flow, absorb the HCl in the exhaust gas into the water, produce dilute hydrochloric acid, discharge it into the dilute hydrochloric acid storage tank 4, and remove HCl gas at the same time, at the outlet of the water washing absorption tower 3, the concentration of HCl is 5 × 10 2 mg / m 3 . After the air is purified by the dryer, it is sent to the oxygen generator 7, and the oxygen produced is sent to the ozone generator 8 to prepare ozone. The ozone is injected into the oxidation absorption tower through the injector an...

Embodiment 2

[0028] It is a process of injecting ozone oxidation into the industrial waste gas tower combined with wet scrubbing and denitrification. figure 1 .

[0029] By the step of embodiment 1, at first the industrial waste gas (10000m 3 / h, containing HCl 2×10 5 mg / m 3 , containing NO X 5×10 4 mg / m 3) introduce a water-washing absorption tower 3 that removes HCl through the exhaust gas delivery pipeline 2, and the spray flow rate in the water-washing absorption tower 3 is 50m 3 / h water flow, absorb the HCl in the exhaust gas into the water, produce dilute hydrochloric acid, discharge it into the dilute hydrochloric acid storage tank 4, and remove HCl gas at the same time, at the outlet of the water washing absorption tower 3, the concentration of HCl is 6 × 10 2 mg / m 3 . After the air is purified by the dryer, it is sent to the oxygen generator 7, and the oxygen produced is sent to the ozone generator 8 to prepare ozone. The ozone is injected into the oxidation absorption t...

Embodiment 3

[0031] The principle of injecting ozone oxidation into the industrial waste gas pipeline combined with wet scrubbing and denitrification process is operated as follows: figure 2 .

[0032] Firstly, the industrial waste gas (5000m 3 / h, containing HCl 1×10 5 mg / m 3 , containing NO X 5×10 4 mg / m 3 , containing organic nitrogen compounds 2×10 4 mg / m 3 ) introduce a water-washing absorption tower 3 that removes HCl through the exhaust gas delivery pipeline 2, and the spray flow rate in the water-washing absorption tower 3 is 30m 3 / h water flow, absorb the HCl in the exhaust gas into the water, produce dilute hydrochloric acid, discharge it into the dilute hydrochloric acid storage tank 4, and remove HCl gas at the same time, at the outlet of the water washing absorption tower 3, the concentration of HCl is 1 × 10 2 mg / m 3 . After the air is purified by the dryer, it is sent to the oxygen generator 7, and the oxygen produced is sent to the ozone generator 8 to prepare ...

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Abstract

The invention discloses an oxidation denitration method for ozone containing HCl industrial exhaust gas, belonging to the field of environmental protection technique. The method of the invention is characterized in that ozone O3 is injected into an oxidation absorption tower where the exhaust gas with the temperature range of 40 to 200 DEG C contains the HCl, so as to oxidize nitrogen compounds such as NO, NO2, etc. in the exhaust gas as high valence nitrogen oxides NO2, N2O3, N2O5, etc. which are easy to be dissolved in water, then a complete denitration disposal process is formed by combining with a wet-method absorption technique. The oxidation denitration method has the advantages of higher denitration efficiency, saving investment, low running expense, no secondary pollution, respectively obtaining by-products to recover the resource, and improving the denitration efficiency by more than 90 percent. The oxidation denitration method can be widely applied to the denitration disposal of the exhaust gas containing various contaminations such as HCI, etc., and is especially suitable for the denitration disposal of the industrial exhaust gases containing contaminations which can lead catalyst in SCR technique to be deactivated.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to an HCl-containing industrial waste gas ozone oxidation denitrification method. technical background [0002] Compared with flue gas from coal-fired boilers, nitrogen-containing compounds (including NO and NO 2 etc.), because of its concentrated distribution, large emission volume, and high emission concentration, it is more harmful to the environment and human body. 2 It is one of the important air pollutants that need to be treated urgently. [0003] At present, the two technologies of selective non-catalytic reduction (SNCR) and selective catalytic reduction (SCR), which are relatively mature exhaust gas denitrification technologies, use amino reducing agents to reduce nitrogen oxides NO X Converted to harmless nitrogen gas N 2 and water vapor H 2 O. The SNCR method is carried out at a high temperature of 900-1200°C; the SCR method is carried out at a temp...

Claims

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Application Information

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IPC IPC(8): B01D53/56B01D53/68B01D53/14B01D53/78B01D53/76
Inventor 林涛
Owner 林涛
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