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Method for simultaneously removing sulfur oxides, nitrogen oxides and carbon monoxide from flue gas

A technology of sulfur oxides and nitrogen oxides, applied in chemical instruments and methods, separation methods, preparation/purification of sulfur, etc., can solve the problems of treatment technology, flue gas and dry gas that have not yet been seen, and achieve simplification The effect of the process

Active Publication Date: 2014-10-29
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
  • Application Information

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Problems solved by technology

From the existing technologies, the removal of sulfur oxides in flue gas and hydrogen sulfide in dry gas is carried out separately, and there is no report on the technology of treating flue gas and dry gas together.

Method used

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  • Method for simultaneously removing sulfur oxides, nitrogen oxides and carbon monoxide from flue gas
  • Method for simultaneously removing sulfur oxides, nitrogen oxides and carbon monoxide from flue gas

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Embodiment

[0045] A continuous flow fixed bed reactor (Φ20×600mm) made of quartz material is used. 5.0g of catalyst is filled in the reactor. The reactor is heated and controlled by a three-stage electric furnace. The flue gas contains eight components: O 2 , CO, CO 2 , SO 2 , NO, NO 2 、H 2 O, N 2 , the reducing gas contains four components: H 2 、CH 4 、H 2 S, N 2 . The composition of the mixed gas after the flue gas and reducing gas are mixed is shown in Table 1. The mixed gas is introduced into the reactor as raw material gas, and the gas flow rate is 3000ml / min. The content of each component in the mixed gas and reaction tail gas was determined by chromatography-mass chromatography.

[0046] See Table 2 for the tail gas composition at normal pressure, 650°C, and when the reaction reaches equilibrium. It can be seen from Table 2 that only 45ppm of SO is contained in the reaction tail gas 2 , far below the emission standard of 190ppm.

[0047] Table 1

[0048]

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Abstract

The invention relates to a method for simultaneously removing sulfur oxides, nitrogen oxides and carbon monoxide in flue gas. According to the invention, an oxidation-reduction reactor is arranged after a catalytic cracking regenerator and before or after a flue gas turbine; high-temperature regeneration flue gas and reducing gas are injected into the oxidation-reduction reactor; the sulfur oxides, nitrogen oxides and oxygen in the flue gas are subjected to an oxidation-reduction reaction with the reducing gas under a normal pressure and a temperature of 500-650 DEG C, such that elemental sulfur, nitrogen and water vapor are produced; mixed flue gas after the reaction is subjected to gradual heat exchange and cooling through an energy recovery system; and elemental sulfur is recovered by liquid sulfur and solid sulfur collectors arranged at a relatively low temperature grade, and a discharging device of the regeneration flue gas with the sulfur oxides, nitrogen oxides and carbon monoxide removed is also arranged. With the method provided by the invention, a subsequent desulphurization treatment process of sulfur-containing flue gas of a catalytic cracking device is eliminated, a catalytic cracking device pollutant controlling process is simplified, and powerful guarantee is provided for clean production of the catalytic cracking device.

Description

technical field [0001] The present invention relates to a method for waste gas treatment, more specifically, relates to a method for removing sulfur oxides and / or nitrogen oxides and carbon monoxide from regeneration flue gas discharged from a regenerator in a catalytic cracking unit, and recovering elemental sulfur . Background technique [0002] The catalytic cracking catalyst is circulated between the reactor and the regenerator. Usually, when leaving the reactor, the catalyst contains about 3-10wt% coke, and the deposited coke must be burned with oxygen in the air in the regenerator to restore catalytic activity. . The coke deposited on the catalyst is mainly a reaction condensate, and its main components are carbon and hydrogen. When the cracking raw material contains sulfur and nitrogen, the coke also contains sulfur and nitrogen. The carbon-deposited catalyst is regenerated with oxygen to generate CO 2 , CO and H 2 O, regeneration flue gas also contains SOx (SO 2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/90B01D53/60B01D53/62C01B17/05
CPCY02A50/20Y02P20/10Y02P20/50
Inventor 郭大为张久顺毛安国谢朝钢傅军王巍于敬川
Owner CHINA PETROLEUM & CHEM CORP
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