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A method for regeneration of denitrification ferric chloride adsorbent

A technology of adsorbent regeneration and ferric chloride, applied in chemical instruments and methods, separation methods, filter regeneration, etc., can solve problems such as high operating costs, impact on catalyst life, and strict requirements on catalyst operating conditions, and achieve fast dehydration speed , easy to operate, and prevent decomposition

Active Publication Date: 2021-10-15
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, Selective Catalytic Conversion (SCR) is one of the main means of controlling flue gas NOx, but the catalyst has strict requirements on operating conditions, ammonia is required as a reducing agent, and the sulfide and dust in the gas flow have a great impact on the life of the catalyst. Especially for coal-fired thermal power plants, the operating costs are very high

Method used

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  • A method for regeneration of denitrification ferric chloride adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Regenerative reaction device

[0026] refer to figure 1 , a regeneration system for a denitrification ferric chloride adsorbent, the system includes a regeneration reactor 3 and absorbers (101 and 102); the lower end of the side of the regeneration reactor 3 is provided with a regeneration gas inlet 1, and the bottom is provided with a material The discharge port 7 is provided with a gas discharge port 4 and a denitrification product inlet 6 at the top, and a porous plate 2 and a stirrer 5 are provided inside;

[0027] The absorber includes a first absorber 101 and a second absorber 102, one side of the first absorber 101 is provided with a first gas inlet 8, the other side is provided with a first gas outlet 10, and the top is provided with a first gas inlet 8. An absorption liquid inlet 9, a first absorption liquid outlet 11 is provided at the bottom; a second gas inlet 14 is provided on one side of the second absorber 102, a second gas outlet 15 is provided at th...

Embodiment 2

[0033] Example 2: Simultaneous removal of nitrogen oxides and water adsorbed by denitrification ferric chloride.

[0034] After the denitrification ferric chloride in Example 1 is added to the regenerative reactor, while heating and keeping the temperature of the material in the reactor at 160-180°C, the mixed gas of nitrosyl chloride and air is directly introduced to remove the denitrification ferric chloride. The adsorbed nitrogen oxide gas and dehydration are carried out simultaneously, and other conditions are the same. Experimental results The regeneration reaction time is about 60min.

Embodiment 3

[0035] Example 3: Dilute with water to release nitrogen oxides adsorbed by denitrification ferric chloride, and then regenerate.

[0036] Dilute the denitrified ferric chloride (temperature 60°C) in Example 1 with water to a mass water content of 25%, remove the adsorbed nitrogen oxides, then change the temperature of the reactor to 65-95°C for dehydration and chlorination, and other The conditions are the same as in Example 1, and the experimental results show that the denitrification ferric chloride regeneration reaction time is about 210min.

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Abstract

The invention discloses a method for regenerating a denitrifying ferric chloride adsorbent. The invention removes the moisture of denitrifying ferric chloride through the reaction of nitrosyl chloride gas and water, thereby realizing the regeneration of denitrifying ferric chloride. At the same time, the hydrogen chloride generated in the reaction process The gas effectively prevents the decomposition of iron salts in the dehydration process, and the decomposition rate of iron salts is below 1%. It has the characteristics of fast dehydration speed, easy operation, high processing efficiency, and can be carried out at lower temperatures.

Description

(1) Technical field [0001] The invention relates to a method for regenerating a denitrification ferric chloride adsorbent, and belongs to the technical field of air pollution control and related environmental protection. (2) Background technology [0002] Nitrogen oxides (NOx) produced by human activities x ) mainly includes NO and NO 2 , of which more than 90% are produced by fuel combustion, followed by industrial processes such as nitric acid production, chemical and pharmaceutical nitration reactions, metal surface and semiconductor processing. NOx is toxic to humans, and a large amount of nitrogen oxide emissions is also one of the main causes of atmospheric photochemical smog and acid rain. Generally, the concentration of nitrogen oxides in the flue gas produced by combustion of fossil fuels in thermal power plants is about several hundred to several thousand ppm, of which more than 95% is nitrogen monoxide. At present, Selective Catalytic Conversion (SCR) is one of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/34B01D53/02
CPCB01D53/02B01D2257/40B01J20/3433B01J20/3483
Inventor 黄立维葛夏莺叶青曹宇杰陈安格
Owner ZHEJIANG UNIV OF TECH
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