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A kind of denitration treatment method of tail gas containing nox

A treatment method and technology for process tail gas, which are applied in gas treatment, separation methods, chemical instruments and methods, etc., can solve the problems of waste absorption liquid generation, complex additive components, by-produced nitric acid or nitrite, etc., to improve absorption effect, the effect of increasing the mass transfer rate coefficient

Active Publication Date: 2019-03-19
SINOPEC DALIAN RES INST OF PETROLEUM & PETROCHEMICALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of the reaction or mass transfer of this technology, it is difficult for the traditional absorption process to ensure that the tail gas of the large volume and high concentration NOx process can be discharged up to the standard after treatment.
At present, many studies use urea combined with additive technology for denitrification treatment to improve the NOx removal effect. Although the NOx removal effect is improved, due to the complex components of the additive, it must be combined with liquid phase by-product processing or waste liquid treatment equipment. Increase the complexity and investment and operation cost of the tail gas treatment device
CN1986033A discloses a wet combined desulfurization and denitrification process using chlorine-containing strong oxidation and enhanced urea. This process has a high NOx removal rate, but at the same time waste absorption liquid will be produced, which needs to be reprocessed
In CN1830526A, a rotating packed bed is used as an absorption device to improve mass transfer, but other acidic or alkaline substances are added in the primary absorption to promote the absorption effect, resulting in the generation of by-product nitric acid or nitrite

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Effect test

Embodiment 1

[0039] Air volume Q=3000Nm 3 / h, NOx concentration is 20000mg / m 3 , where NO concentration is 11000mg / m 3 The process tail gas is treated. The process tail gas first enters the primary oxidizer, and the primary oxidizer uses O 2 is an oxidizing agent, O 2 Filling volume is 15m 3 / h, the oxidation time is 20 seconds. After oxidation treatment, the tail gas enters the high-gravity rotating bed reactor. The absorption liquid used in the high-gravity rotating bed reactor is urea solution with a mass concentration of 25%. The treatment conditions are: temperature 15°C, rotating bed speed 2000rpm, liquid-gas ratio 20L / m 3 , The NOx removal rate after this level of treatment can reach 70% to 83%. The volume flow rate of the liquid phase outlet of the high-gravity rotating bed reactor into the secondary circulation tank is 1 / 3 of the total flow of the absorbing liquid out of the reactor, and the liquid level of the secondary circulation tank is controlled at 3 / 5 of the tank heig...

Embodiment 2

[0041] Air volume Q=9000Nm 3 / h, NOx concentration is 5000mg / m 3 , where the NO concentration is 3200mg / m 3 The process tail gas is treated. The primary oxidizer uses O 3 is an oxidizing agent, O 3 Filling volume is 8m 3 / h, the oxidation time is 10 seconds. The absorption liquid used in the high-gravity rotating bed reactor is a urea solution with a mass concentration of 15%, and the treatment conditions are: temperature 20°C, rotating bed speed 900rpm, liquid-gas ratio 12 L / m 3 , The NOx removal rate after this level of treatment can reach 75% to 80%. The volume flow rate of the liquid phase outlet of the high-gravity rotating bed reactor into the secondary circulation tank is 1 / 5 of the total flow of the absorbing liquid out of the reactor, and the liquid level of the secondary circulation tank is controlled at 2 / 3 of the tank height, which is adjusted through liquid level interlocking Circulation flow from the secondary circulation tank to the primary circulation ta...

Embodiment 3

[0043] Air volume Q=5000Nm 3 / h, NOx concentration is 11000mg / m 3 , where the NO concentration is 8200mg / m 3 The process tail gas is treated. The primary oxidizer uses O 3 is an oxidizing agent, O 3 Filling volume is 10m 3 / h, the oxidation time is 12 seconds. The absorption liquid used in the high-gravity rotating bed reactor is a urea solution with a mass concentration of 20%, and the treatment conditions are: temperature 20°C, rotating bed speed 1500rpm, liquid-gas ratio 15 L / m 3 , The NOx removal rate after this level of treatment can reach 72% to 82%. The volume flow rate of the liquid phase outlet of the high-gravity rotating bed reactor into the secondary circulation tank is 1 / 4 of the total flow of the absorbing liquid out of the reactor, and the liquid level of the secondary circulation tank is controlled at 3 / 4 of the tank height, which is adjusted through liquid level interlocking Circulation flow from the secondary circulation tank to the primary circulation...

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Abstract

The invention discloses a method for performing denitration treatment on NOx-containing process tail gas. The method comprises the following steps: (1) introducing process tail gas containing high-concentration NOx into a first-stage oxidizer to perform oxidation treatment; (2) introducing the process tail gas subjected to first-stage oxidation and absorbing liquid from a first-stage circulating tank into a supergravity rotary bed reactor separately, performing mixed reaction on the process tail gas and the absorbing liquid in the supergravity rotary bed reactor, absorbing part of NOx in the process tail gas, introducing the residual tail gas into a second-stage oxidizer to perform oxidation treatment, dividing the absorbing liquid out of the reactor into a branch 1 and a branch 2, enabling the branch 1 to circularly return the first-stage circulating tank, enabling the branch 2 to enter a second-stage circulating tank, performing mixed reaction on the branch 2 and the absorbing liquid in the second-stage circulating tank, and dividing the absorbing liquid after reaction into a branch 1' and a branch 2'; (3) introducing the branch 1' and the tail gas subjected to second-stage oxidation into an efficient absorbing tower separately, performing absorbing treatment on the tail gas by the absorbing liquid, enabling the absorbing liquid to return the second-stage circulating tank for recycle, enabling the branch 2' to enter the first-stage circulating tank, performing mixed reaction on the branch 2' and the absorbing liquid in the first-stage circulating tank for recycling, and demisting the treated tail gas to realize up-to-standard discharge. According to the method, the absorbing effect is good, the treated process tail gas with high-concentration NOx meets the up-to-standard discharge requirement, high efficiency is realized and three-waste discharge is avoided.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a NOx-containing process tail gas denitrification treatment method, which is particularly suitable for the treatment of process tail gas with high NOx concentration and fluctuating content. Background technique [0002] Nitric acid is an important chemical raw material, which can be used to manufacture chemical fertilizers, explosives, dyes, pharmaceuticals, synthetic fibers, inorganic salts and other chemical products. In the production of nitric acid and the production of chemical products involving nitric acid as raw material or through nitro reaction, there will generally be NOx process tail gas, such as nitrogen fertilizer plants, explosives plants, catalyst preparation plants, organic chemical plants, etc. Production process. This kind of tail gas is characterized by high NOx concentration, which is easily affected by raw materials and operating conditions, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/75B01D53/74B01D53/76B01D53/14B01D53/78B01D53/79B01D53/56
CPCB01D53/14B01D53/1493B01D53/56B01D53/74B01D53/75B01D53/76B01D53/78B01D53/79B01D2221/14B01D2251/102B01D2251/104B01D2251/2067B01D2252/2053B01D2257/40B01D2257/404B01D2259/10
Inventor 张雁玲
Owner SINOPEC DALIAN RES INST OF PETROLEUM & PETROCHEMICALS CO LTD