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Flue gas washing method and catalytic cracking method

A washing method and flue gas technology, which is applied in catalytic cracking, cracking, separation methods, etc., can solve the problems of flue gas tailing, etc., and achieve the goals of slowing down equipment corrosion, simple and easy washing method, and reducing operating load and absorption liquid consumption Effect

Pending Publication Date: 2019-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of this disclosure is to provide a flue gas scrubbing method and a catalytic cracking method to solve the flue gas tailing and sinking problems of existing and new wet scrubbing systems, and reduce adverse effects on the factory area and surrounding production and living environments

Method used

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  • Flue gas washing method and catalytic cracking method
  • Flue gas washing method and catalytic cracking method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Add 1.5% by weight of the sulfur transfer agent prepared according to Example 5 of patent CN1323132C into the catalyst system of the catalytic cracking unit, and the regenerated flue gas enters the flue gas inlet of the washing tower after heat exchange by the waste heat boiler. The average composition of the main pollutants in the inlet flue gas is: SO 2 : 95mg / m 3 , SO 3 : 10mg / m 3 , NOx: 85mg / m 3 , solid dust: 115mg / m 3 . Flue gas flow 5100Nm 3 / min, the inlet temperature is 170°C.

[0076] The structure of the washing tower is attached figure 1 As shown, a primary clean water spraying device is set in the chimney 5. The cleaning water nozzle 8 adopts a polytetrafluoro material spiral nozzle, the number is 4, and it is arranged at an angle of 90° along the circumferential direction, such as figure 2 shown. Honeycomb structured packing with a bed height of 0.3 m is filled between the clean water nozzle 8 and the clean water liquid storage tank 13 . The tem...

Embodiment 2

[0079] Add 1.8% by weight of the sulfur transfer agent prepared according to Example 5 of patent CN1323132C into the catalyst system of the catalytic cracking unit, and the regenerated flue gas enters the flue gas inlet of the washing tower after heat exchange in the waste heat boiler. The average composition of the main pollutants in the inlet flue gas is: SO 2 : 65mg / m 3 , SO 3 : 10mg / m 3 , NOx: 82mg / m 3 , solid dust: 124mg / m 3 . Flue gas flow 5100Nm 3 / min, the inlet temperature is 170°C.

[0080] The structure of the washing tower is different from that of Example 1 in that no clean water spraying device is installed in the chimney, but the absorption liquid feed valve of the second-stage absorption liquid spraying device in the washing tower body is closed, and it is directly converted to clean water spraying. That is, it is supplied with clean water instead of absorption fluid. The temperature of the fresh clean water provided to the clean water spraying device i...

Embodiment 3

[0083] The catalyst system of the catalytic cracking unit does not contain a sulfur transfer agent, and the regenerated flue gas enters the inlet of the scrubber after heat exchange in the waste heat boiler. The mean value of the main pollutant composition of the inlet flue gas is, SO 2 : 850mg / m 3 , SO 3 : 590mg / m 3 , NOx: 90mg / m 3 , solid dust: 120mg / m 3 . Flue gas flow 5100Nm 3 / min, the inlet temperature is 170°C.

[0084] The structure of the washing tower is the same as in Example 1. The temperature of the fresh clean water provided to the clean water spraying device is 20°C, the dissolved solid content is 0.002% by weight, and the replenishment amount is 5t / h (0.016kg / Nm 3 flue gas), cleaning water nozzle pump outlet pressure 0.4MPa, total spraying 0.12kg water / Nm 3The flue gas and clean water are directly sent to the clean water spray device (clean water nozzle) by the clean water supply pump 7, and the clean water collected by the clean water storage tank 13 ...

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Abstract

The invention relates to a flue gas washing method and a catalytic cracking method. The flue gas washing method includes: guiding flue gas into a flue gas washing tower to contact with absorbing liquid containing an absorber, and enabling the flue gas after contacting with the absorbing liquid to contact with clean water before going out of the tower. The flue gas washing method is simple and easyto implement, flue gas tailing of the wet-process washing tower can be eliminated effectively, and the problem that blue smoke and smoke plume sink is solved.

Description

technical field [0001] The present disclosure relates to a flue gas scrubbing method and a catalytic cracking method. Background technique [0002] In the industrial production process, especially in some production processes containing heat treatment steps (drying, roasting, burning, etc.), waste gases such as tail gas or flue gas containing pollutants will be produced. For example, in the catalytic cracking (FCC) process, part of the sulfur and nitrogen compounds in the raw material enter the coke during the riser reaction process and deposit on the spent catalyst. , Nitrogen compounds are oxidized to produce SO x , NO x and other smoke pollutants. For another example, in inorganic chemical processes such as catalyst production, sulfuric acid salts, nitrate salts, and chloride salts contained in raw materials will produce SO x , NO x , Cl 2 , HCl and other pollutants and harmful gas exhaust. The flue gas and tail gas containing pollutants and harmful gases need to b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D47/06B01D47/14B01D53/18B01D53/50B01D53/56B01D53/58B01D53/60B01D53/62B01D53/68B01D53/78B01D53/96C10G11/02
CPCY02A50/20Y02P70/10
Inventor 宋海涛姜秋桥王鹏孙言林伟田辉平张久顺达志坚
Owner CHINA PETROLEUM & CHEM CORP
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