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Industrial tail gas low-temperature denitration method and system

A technology for low-temperature denitrification and industrial tail gas, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve problems such as catalyst poisoning and deactivation, and achieve the effects of improved low-temperature efficiency, simple preparation process, and high adsorption efficiency

Pending Publication Date: 2021-04-23
THE SIXTH CONSTR CO LTD OF CHINA NAT CHEM ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention discloses a method and system for low-temperature denitrification of industrial tail gas, which is used to solve the problem that the operating temperature of traditional tail gas treatment must be higher than 350°C to avoid SO in the flue gas. 2 React with NH to generate ammonium sulfate to block the catalyst pores. Therefore, the SCR reactor needs to be arranged before dust removal and desulfurization. This arrangement causes the flue gas passing through the SCR reactor to contain a large amount of SO 2 And alkali metals such as K and Na will cause the problem of catalyst poisoning and deactivation

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  • Industrial tail gas low-temperature denitration method and system

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Embodiment 1

[0038] This embodiment discloses as figure 1 A low-temperature denitrification method for industrial tail gas shown, comprising the following steps:

[0039] S1 Fully dissolve manganese acetylacetonate in acetone solution, and stir at room temperature to fully mix and dissolve;

[0040] S2 adds SAPO-34 molecular sieve and acetone to the S1 solution, and continues to stir until fully mixed and dissolved to obtain a mixed solution;

[0041] S3 places the mixed solution in an ultrasonic reactor for ultrasonic treatment, and continues to stir at room temperature until a dark yellow dry gelatinous solid is formed;

[0042] S4 drying the colloidal solid and drying the powder obtained in a tube furnace to obtain a low-temperature SCR flue gas denitrification catalyst;

[0043] S5 uses low-temperature SCR flue gas denitrification catalyst as the treatment link after desulfurization and dust removal of industrial tail gas to complete low-temperature denitrification.

[0044] In this...

Embodiment 2

[0051] This embodiment discloses the reaction steps when performing denitrification treatment:

[0052] T1 reaction components are transferred from the fluid body to the outer surface of the solid catalyst;

[0053] T2 reaction components are transferred from the outer surface of the catalyst to the inner surface of the catalyst;

[0054] T3 reaction components are adsorbed on the surface of the catalyst;

[0055] T4 reaction components undergo chemical reactions on the catalyst surface;

[0056] The T5 reaction product is desorbed on the catalyst surface;

[0057] The T6 reaction product is transferred from the inner surface of the catalyst to the outer surface of the catalyst;

[0058] The T7 reaction product is transferred from the outer surface of the catalyst to the main body of the fluid.

[0059] In this embodiment, when the conditions of flue gas entering the SCR reactor, such as flue gas flow rate, temperature, composition, etc., reach the predetermined working co...

Embodiment 3

[0070] This embodiment discloses a low-temperature denitrification system for industrial tail gas, which includes an SCR reactor, a thermocouple, a pressure transmitter, a catalyst injection device, a flue gas measurement device, and an electrical control assembly.

[0071] In summary, the present invention uses the SCR flue gas denitrification catalyst, its thermal stability is greatly improved, and it is effective in catalytic removal of NO X The low temperature efficiency is greatly improved, the preparation process of the SCR flue gas denitrification catalyst of the present invention is simple, and the surface active groups are complex, and its NO X The adsorption capacity is higher, and higher adsorption efficiency can be achieved at high space velocity. At the same time, the SCR flue gas denitrification catalyst of the present invention has a well-developed pore structure and a relatively large inner surface. Because the chemical reaction of gas components must be carried...

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Abstract

The invention relates to the technical field of tail gas treatment, and particularly relates to an industrial tail gas low-temperature denitration method and system. The method comprises the steps of fully dissolving manganese acetylacetonate in an acetone solution, and stirring at the room temperature to be fully mixed and dissolved; adding an SAPO-34 molecular sieve and acetone into the solution, and continuously stirring to obtain a mixed solution; putting the mixed solution into an ultrasonic reactor for ultrasonic treatment, and continuously stirring at room temperature until a dark yellow dry colloidal solid is formed; and drying the dry colloidal solid to obtain powder, and roasting the powder in a tubular furnace to obtain a low-temperature SCR flue gas denitration catalyst; and taking the low-temperature SCR flue gas denitration catalyst as a treatment link after desulfurization and dust removal of industrial tail gas to complete low-temperature denitration. The thermal stability is greatly improved, the low-temperature efficiency is greatly improved when NOX is catalytically removed, the preparation process of the SCR flue gas denitration catalyst is simple, surface active groups are complex, the NOX adsorption capacity is higher, and relatively high adsorption efficiency is achieved at a high airspeed.

Description

technical field [0001] The invention relates to the technical field of tail gas treatment, in particular to a method and system for low-temperature denitrification of industrial tail gas. Background technique [0002] Nitrogen oxides (NO X ) is the main cause of acid rain, as well as the formation of near-surface atmospheric ozone, secondary fine particle pollution, eutrophication of surface water, and photochemical smog. Nitric oxide (NO) and nitrogen dioxide (NO 2 ), its main sources are mobile sources (motor vehicles, accounting for about 49%) and stationary sources (thermal power plants, industrial boilers, accounting for about 46%). With the enhancement of people's awareness of environmental protection and the increasingly stringent regulations and policies, the removal and emission reduction of nitrogen oxides has increasingly been put on the agenda of environmental protection departments and production units. [0003] At present, the widely used nitrogen oxide remo...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/56B01D53/88B01J29/85
CPCB01D53/8628B01D53/885B01J29/85B01D2258/02
Inventor 肖逸麻强李宁王维江王怀金
Owner THE SIXTH CONSTR CO LTD OF CHINA NAT CHEM ENG
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