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Method and device for modifying or regenerating SCR catalyst by utilizing lanthanum salt or cerium salt

A SCR catalyst and catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of high cost, harsh operating environment, time-consuming and consumption of SCR catalysts To solve problems such as power and other problems, to achieve the effect of widening the working temperature window, improving the anti-poisoning ability, saving time and labor costs

Inactive Publication Date: 2015-09-09
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Catalyst, as the core of SCR technology, has the following three problems in actual operation: (1) Due to the harsh operating environment, it is prone to deactivation due to poisoning, dust accumulation, loss of active substances, etc., resulting in reduced catalyst activity or even deactivation
Catalyst service life is very low, generally 16000~24000h
(2) The SCR catalyst has a narrow activity window and a high activation temperature, and its denitrification efficiency is also low when the flue gas temperature is low
(3) It is costly and uneconomical to replace the deactivated SCR catalyst
[0009] The above patents all start from the preparation of the carrier to prepare the catalyst, and the process is complicated; it needs to be calcined twice, and the preparation time is long; manual operation, the steps are cumbersome and error-prone, time-consuming and labor-intensive

Method used

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  • Method and device for modifying or regenerating SCR catalyst by utilizing lanthanum salt or cerium salt
  • Method and device for modifying or regenerating SCR catalyst by utilizing lanthanum salt or cerium salt
  • Method and device for modifying or regenerating SCR catalyst by utilizing lanthanum salt or cerium salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) 1g of cerium nitrate is added to 50ml of distilled water, stirred until completely dissolved to obtain an impregnation solution;

[0033] (2) Take 8.3 g of the SCR catalyst module deactivated by K poisoning and place it on the conveyor belt 2 and transport it to the impregnation solution made in step (1) for impregnation, first vibrate with ultrasonic waves for 10 minutes, and then let it stand for immersion for 4 hours;

[0034] (3) The mechanical gripper 1 takes out the impregnated catalyst module in step (2) and filters it dry, puts it in the material port 8 of the calciner 7, then sends it into the calciner 7, and in the calciner 7, it is heated in the air at 100-120°C. Dry in the atmosphere for 12h;

[0035](4) The catalyst dried in step (3) was calcined in an air atmosphere at 250° C. for 4 hours to obtain a cerium salt-modified SCR catalyst.

[0036] The SCR catalyst modified by cerium nitrate in this example is used for flue gas denitrification, and the spa...

Embodiment 2

[0038] (1) Add 1.2g of cerium nitrate into 50ml of distilled water, stir until completely dissolved, and obtain an impregnation solution;

[0039] (2) Place 10 g of fresh SCR catalyst modules on the conveyor belt 2 and transport them to the impregnation solution prepared in step (1) for immersion, first bubbling and shaking for 10 minutes, then standing and soaking for 4.5 hours;

[0040] (3) The mechanical gripper 1 takes out the impregnated catalyst module in step (2) and filters it dry, puts it in the material port 8 of the calciner 7, then sends it into the calciner 7, and in the calciner 7, it is heated in the air at 100-120°C. Dry in the atmosphere for 12h;

[0041] (4) The catalyst dried in step (3) was calcined in an air atmosphere at 325° C. for 4.5 hours to obtain a cerium salt-modified SCR catalyst.

[0042] The SCR catalyst modified by cerium nitrate in this example is used for flue gas denitrification, and the space velocity ratio is 6500h -1 , the flue gas NOX ...

Embodiment 3

[0044] (1) 1.25g of cerium nitrate was added into 50ml of distilled water, and stirred until completely dissolved to obtain an impregnation solution;

[0045] (2) Place 7.6 g of the composite poisoned and deactivated SCR catalyst module on the conveyor belt 2 and transport it to the impregnation solution prepared in step (1) for impregnation, first bubbling and shaking for 12 minutes, and then standing for 5 hours;

[0046] (3) The mechanical gripper 1 takes out the impregnated catalyst module in step (2) and filters it dry, puts it in the material port 8 of the calciner 7, then sends it into the calciner 7, and in the calciner 7, it is heated in the air at 100-120°C. Dry in the atmosphere for 12h;

[0047] (4) Calcining the dried catalyst in step (3) in an air atmosphere at 400° C. for 5 hours to obtain a cerium salt-modified SCR catalyst.

[0048] The SCR catalyst modified by cerium nitrate in this example is used for flue gas denitrification, and the space velocity ratio i...

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Abstract

The invention discloses a method and a device for modifying or regenerating an SCR catalyst by utilizing a lanthanum salt or cerium salt. According to the invention, an industrial SCR catalyst is taken as a carrier, and the lanthanum salt or cerium salt is taken as a modifier or a regenerant to modify or regenerate the SCR catalyst. The devices used for realizing the method comprises a manipulator, a conveyer belt, a guide wheel, a gear, an ultrasonic immersing tank and a calcining furnace. By using the device disclosed by the invention to carry out hoisting transportation and immersing on a catalyst module, time and labor cost are saved, and the operation is convenient and quick. Compared with a single SCR catalyst, a proper quantity of lanthanum nitrate or cerium nitrate is added to the lanthanum salt or cerium salt modified catalyst, and therefore, the working temperature window of the SCR catalyst is widened, and the poison tolerance of the catalyst is improved.

Description

technical field [0001] The invention belongs to the field of flue gas denitrification in thermal power plants, and relates to a method and a device for modifying and regenerating SCR catalysts through lanthanum salts and cerium salts. Background technique [0002] Nitrogen oxides (NOx) emitted by coal-fired power plants are one of the main air pollutants. Nitrogen oxides are the main cause of various environmental problems such as acid rain, photochemical smog, greenhouse effect, and ozone layer depletion, and also have an impact on human health. The NOx produced by fossil fuel combustion is mainly NO and NO2. The less toxic NO is quickly oxidized to NO2 in the air, but NO2 is relatively stable and more toxic. NOx and volatile organic compounds undergo a series of photochemical reactions under the radiation of sunlight to produce photochemical smog. Photochemical smog is very irritating to the eyes and respiratory system, and can cause disease and even death. NOx is oxidi...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01J23/92
Inventor 赵钦新孙一睿李钰鑫梁志远王云刚杨文君
Owner XI AN JIAOTONG UNIV
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