A kind of purification treatment technology of high concentration NOx process tail gas

A technology for purification treatment and process tail gas, applied in gas treatment, chemical instruments and methods, separation methods, etc., can solve the problems of high NOx concentration, low treatment temperature, and easy fluctuation of content, so as to improve removal rate and low operating cost , reduce the effect of side effects

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

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Problems solved by technology

[0007] Aiming at the deficiencies in the prior art of low processing temperature, high NOx concentration and easily fluctuating process tail gas, the present invention proposes a purification treatment process for high-concentration NOx process tail gas. This method has a good absorption effect, and the high-concentration NOx after treatment Process tail gas meets emission standards, high efficiency and no "three wastes" emission

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  • A kind of purification treatment technology of high concentration NOx process tail gas

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Embodiment 1

[0041] Use as figure 1 The purification treatment process shown, the gas volume Q=7000Nm 3 / h, NOx concentration is 10000mg / m 3 , Where the NO concentration is 7000mg / m 3 The process exhaust gas is processed. In the embodiment of the present invention, the first-stage reactor, the second-stage reactor and the third-stage reactor all adopt a rotating bed reactor.

[0042] The process tail gas first enters the primary oxidizer, which uses O 2 Is the oxidant, O 2 The filling volume is 30m 3 / h, the oxidation time is 20 seconds; the exhaust gas from the oxidation treatment enters the first-stage reactor, and NOx is absorbed and treated by the urea solution with a mass concentration of 23% in the reactor. The treatment conditions are: temperature 15℃, liquid-gas ratio 20 L / m 3 , The rotating bed speed is 1500 rpm; the volume flow of the absorption liquid out of the primary reactor into the secondary storage tank is 1 / 4 of the total flow of the absorption liquid out of the reactor; the ...

Embodiment 2

[0045] Counter air volume Q=5000Nm 3 / h, NOx concentration is 18000mg / m 3 , Where the NO concentration is 12000mg / m 3 The process exhaust gas is processed. In the embodiment of the present invention, the first-stage reactor and the third-stage reactor adopt a rotating bed reactor, and the second-stage reactor adopts a packed absorption tower.

[0046] The process tail gas first enters the primary oxidizer, which uses O 3 Is the oxidant, O 3 The filling volume is 17m 3 / h, the oxidation time is 10 seconds; the exhaust gas from the oxidation treatment enters the first-stage reactor, and the NOx is absorbed and treated by the urea solution with a mass concentration of 25% in the reactor. The treatment conditions are: temperature 10℃, liquid-gas ratio 25 L / m 3 , The rotating bed speed is 2000 rpm; the volume flow rate of the absorption liquid from the primary reactor into the secondary storage tank is 1 / 3 of the total flow of the absorption liquid from the reactor; the tail gas from th...

Embodiment 3

[0049] Counter air volume Q=4000Nm 3 / h, NOx concentration is 7000mg / m 3 , Where the NO concentration is 5000mg / m 3 The process exhaust gas is processed. In the embodiment of the present invention, the first-stage reactor and the third-stage reactor adopt a rotating bed reactor, and the second-stage reactor adopts a packed absorption tower.

[0050] The process tail gas first enters the primary oxidizer, which uses O 2 Is the oxidant, O 2 The filling volume is 10m 3 / h, the oxidation time is 15 seconds; the exhaust gas from the oxidation treatment enters the first-stage reactor, and the NOx is absorbed and treated by the urea solution with a mass concentration of 15% in the reactor 2. The treatment conditions are: temperature 10℃, liquid-gas ratio 15 L / m 3 , The rotating bed speed is 1000 rpm; the volume flow of the absorption liquid from the first reactor into the second storage tank is 1 / 4 of the total flow of the absorption liquid from the reactor; the tail gas from the first re...

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Abstract

The invention discloses a purification treatment technology of high-concentration NOx process exhaust gas. The purification treatment technology comprises (1) carrying out oxidation treatment on high-concentration NOx process exhaust gas, mixing the treated high-concentration NOx process exhaust gas and an absorption liquid from a primary storage tank for a reaction, dividing the absorption liquid discharged by a primary reactor into two paths, returning the first path into the primary storage tank and feeding the second path into a secondary storage tank, (2) carrying out oxidation treatment on the treated process exhaust gas, dividing the absorption liquid passing in the secondary storage tank into three paths after passing through a secondary circulating pump, respectively introducing the first path and the oxidized exhaust gas into a secondary reactor, carrying out absorption treatment, returning the absorption liquid into the secondary storage tank, feeding the second path into the primary storage tank and feeding the third path into a tertiary storage tank, and (3) carrying out oxidation treatment on the treated process exhaust gas, absorbing the process exhaust gas by the absorption liquid in a tertiary reactor, dividing the absorption liquid discharged by the tertiary reactor into two paths, circulating the first path into the tertiary storage tank, feeding the second path into the secondary storage tank, demisting the treated exhaust gas and discharging the exhaust gas satisfying the standards. The purification treatment technology has good absorption effects. The treated high-concentration NOx process exhaust gas satisfies standard discharge requirements, has high efficiency and prevents discharge of three wastes.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/75B01D53/56
CPCB01D53/56B01D2251/102B01D2251/104B01D2251/2067B01D2258/02
Inventor 张雁玲
Owner SINOPEC DALIAN RES INST OF PETROLEUM & PETROCHEMICALS CO LTD
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