Device and method for performing ozone step-by-step oxidative absorption and desulfurization and denitration for industrial flue gas

A technology of ozone oxidation and step-by-step oxidation, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of high ozone consumption and high process cost, achieve simple process and operation, reduce ozone consumption, and improve ozone utilization efficiency effect

Inactive Publication Date: 2017-07-18
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Claims
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AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that the amount of ozone used in the existing ozone oxidation desulfurization and denitrification process is generally high, which leads to the problem that the process cost is too high, the present invention provides a device and method for simultaneous desulfurization and denitrification of industrial flue gas ozone oxidation and absorption

Method used

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  • Device and method for performing ozone step-by-step oxidative absorption and desulfurization and denitration for industrial flue gas
  • Device and method for performing ozone step-by-step oxidative absorption and desulfurization and denitration for industrial flue gas

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Embodiment 1

[0064] Such as figure 1 As shown, this embodiment provides a device for simultaneous desulfurization and denitrification of industrial flue gas ozone step-by-step oxidation absorption, the device includes a flue gas absorption system and an ozone generator 1; the flue gas absorption system includes a first-stage absorption tower 2 and the second stage absorption tower 3. The top of the first-stage absorption tower 1 is provided with a flue gas inlet connected to the flue gas pipeline, and the middle part of the first-stage absorption tower 1 is provided with a flue gas outlet, between the flue gas inlet and the flue gas outlet of the first-stage absorption tower 1 There are 2 spray layers, the top of the second-stage absorption tower 2 is provided with a chimney 10, the middle part of the second-stage absorption tower 2 is provided with a flue gas inlet, and the chimney 10 and the flue gas inlet of the second-stage absorption tower 2 are connected by a Down to be provided wit...

Embodiment 2

[0075] Such as figure 2 As shown, this embodiment provides a device for simultaneous desulfurization and denitrification of industrial flue gas ozone step-by-step oxidation absorption, the device includes a flue gas absorption system and an ozone generator 1; the flue gas absorption system includes a first-stage absorption tower 2 and the second stage absorption tower 3. The middle part of the first stage absorption tower 1 is provided with a flue gas inlet connected to the flue gas pipeline, and the top of the first stage absorption tower 1 is provided with a flue gas outlet, between the flue gas inlet and the flue gas outlet of the first stage absorption tower 1 There is a spray layer, the top of the second-stage absorption tower 2 is provided with a chimney 10, the middle part of the second-stage absorption tower 2 is provided with a flue gas inlet, and the chimney 10 and the flue gas inlet of the second-stage absorption tower 2 are connected by a Down to be provided with...

Embodiment 3

[0086] This embodiment provides a device for step-by-step oxidation and absorption of industrial flue gas ozone and simultaneous desulfurization and denitrification. The device refers to the device described in Embodiment 1, the difference is that two spray layers are set in the first-stage absorption tower 1, and the second One spray layer is set in the secondary absorption tower 2 .

[0087] The device is used to carry out step-by-step oxidation and absorption of industrial flue gas ozone while desulfurization and denitrification. The method is aimed at the flue gas discharged from an industrial boiler, and the flue gas flow rate: 10000Nm 3 / h, temperature 120℃~140℃, SO 2 Concentration 1000mg / Nm 3 , NO x Concentration 300mg / Nm 3 . The total amount of ozone used in the two-stage oxidation reaction in the process is 1.88kg / h, which is different from the NO in the flue gas x The molar ratio is 0.6.

[0088] The specific method is with reference to the method in Example 1,...

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Abstract

The invention provides a device and a method for performing ozone step-by-step oxidative absorption and desulfurization and denitration for industrial flue gas. The device comprises a flue gas absorption system and an ozone generator, wherein the flue gas absorption system comprises two stages of absorption towers which are in series connected front and rear; a flue gas inlet of the absorption tower at the first stage is connected with a flue gas pipeline, and a flue gas outlet of the absorption tower at the first stage is connected with a flue gas inlet of the absorption tower at the second stage through a flue gas pipeline; and an outlet of the ozone generator is connected with flues arranged on the front end of the two stages of the absorption towers. According to the method provided by the invention, ozone is separately sprayed into the flues at the front ends of the two stages of the absorption towers in certain proportion, flue gas is subjected to first-stage flue gas absorption after being oxidized by first-stage ozone, so that most of SO2 and NOX are removed; second-stage flue gas absorption is performed after second-stage ozone oxidization is performed, so that the rest of SO2 and NOX is removed. The device has the advantages of small ozone dose, compact equipment, low investment and operation cost, and the like, and is suitable for deep desulfurization and denitration treatment.

Description

technical field [0001] The invention belongs to the field of flue gas pollution control, and relates to a device and method for stepwise oxidation and absorption of industrial flue gas ozone and simultaneous desulfurization and denitrification. Background technique [0002] my country's iron and steel, coking and other industries have huge production capacity, SO 2 and NO x Emissions of air pollutants such as air pollutants remain high, and increasingly stringent emission standards have created an urgent need for low-cost flue gas deep treatment in these industries. Taking the coking industry as an example, the "Emission Standards for Pollutants in the Coking Chemical Industry" (GB-16171-2012), which was implemented in 2015, requires NO x The emission concentration is lower than 500mg / Nm 3 (Emission requirements in special areas are lower than 150mg / Nm 3 ). For the steel industry, the sintering (pelletizing) process is SO 2 and NO x The main source of emissions, the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/60
CPCB01D53/60B01D53/75B01D2251/104B01D2258/0283Y02A50/20
Inventor 李会泉王兴瑞孟子衡
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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