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A Method for Reducing Nox in Catalytic Cracking Incompletely Regenerated Flue Gas

A technology for regenerating flue gas and catalytic cracking, applied in combustion methods, incinerators, combustion types, etc., can solve problems such as system complexity, reducing agent escape, secondary pollution, etc., and achieve high removal efficiency

Active Publication Date: 2020-03-31
SINOPEC LUOYANG TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of denitrification additives is high, the operating cost is high, and there are great limitations in the application occasions
Another way is the follow-up treatment. The CO boiler is sprayed with a reducing agent to reduce the NOx produced by combustion to N by non-catalytic reduction. 2 , this method has problems such as reducing agent escape and secondary pollution
In the denitrification device, methods such as oxidation and catalytic reduction are used to remove NOx in flue gas. This method has problems such as complex system, high investment and operation cost, and secondary pollution.

Method used

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  • A Method for Reducing Nox in Catalytic Cracking Incompletely Regenerated Flue Gas
  • A Method for Reducing Nox in Catalytic Cracking Incompletely Regenerated Flue Gas
  • A Method for Reducing Nox in Catalytic Cracking Incompletely Regenerated Flue Gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] see figure 1 , a schematic diagram of a system for reducing the NOx content of incompletely regenerated flue gas from catalytic cracking provided in this example. Including regenerator 1, cyclone separator 2, flue gas turbine 3, waste heat boiler 4 and chimney 5, wherein the outlet at the top of regenerator 1 is connected to the inlet at the top of cyclone separator 2, and the outlet at the top of cyclone separator 2 is connected to the main line 6 connection, the end of the main line 6 is connected with the first pipeline 7 and the second pipeline 8 respectively, the confluence of the first pipeline 7 and the second pipeline 8 is connected with the vertical main line 9, and the end of the vertical main line 9 is connected with the horizontal main line The end of the horizontal main line 10 is connected to the inlet of the flue gas turbine 3 , the outlet of the flue gas turbine 3 is connected to the inlet of the waste heat boiler 4 , and the outlet of the waste heat boi...

Embodiment 2

[0058] see also figure 1 and figure 2 , this embodiment provides a method for reducing the NOx content of incompletely regenerated flue gas from catalytic cracking, including:

[0059] 1) Regenerator 1 produces incompletely regenerated flue gas at a temperature of 600°C. The oxygen content in the incompletely regenerated flue gas is 0.3%, the CO content is 5%, and the H 2 O content is 12%, NH 3 The content is 500ppm, and the HCN content is 50ppm.

[0060] 2) The incompletely regenerated flue gas enters the cyclone separator 2 to remove the catalyst fine powder particles in the incompletely regenerated flue gas, and the incompletely regenerated flue gas exiting the cyclone separator 2 enters the main line 6, and the incompletely regenerated smoke in the main line 6 The gas is divided into the first pipeline 7 and the second pipeline 8, 70% of the incompletely regenerated flue gas enters the first pipeline 7, and 30% of the incompletely regenerated flue gas enters the second...

Embodiment 3-6

[0072] The experimental process is similar to that of Example 2, except that the injecting methods of oxygen-enriched gas, fuel-enriched gas and high-temperature air are changed while the composition of flue gas remains unchanged.

[0073] Experimental parameters in table 1 embodiment 2-6

[0074]

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Abstract

The invention discloses a method for reducing NOx in catalytic cracking incomplete regeneration flue gas. The method for reducing the NOx in the catalytic cracking incomplete regeneration flue gas comprises the steps of firstly, removing solid particles in the incomplete regeneration flue gas; and secondly, enabling the incomplete regeneration flue gas to have mixed reaction with high temperatureoxygen enriched gas, high temperature fuel-enriched gas and high temperature air so as to reduce the content of the NOx in the incomplete regeneration flue gas. According to the method for reducing the NOx in the catalytic cracking incomplete regeneration flue gas, the content of the NOx in the catalytic cracking incomplete regeneration flue gas can be reduced to 20-50 ppm, and the removing efficiency reaches up to 85% or above.

Description

technical field [0001] The invention relates to reducing NO in flue gas x The technical field of content, especially relates to a kind of reducing catalytic cracking incompletely regenerated flue gas NO x Methods. Background technique [0002] In the petroleum refining industry, catalytic cracking is one of the important means of lightening heavy oil in modern refineries, and it is also the main source of refinery pollutants. In recent years, with the continuous increase of nitrogen compounds in raw oil, the emission of nitrogen oxides in the regeneration flue gas of catalytic cracking unit has also increased, and its emission accounts for about 50% of the NOx emission of the entire refinery. With the increasingly stringent environmental protection regulations, it is required that the NOx emission value of catalytic flue gas should not be greater than 50ppm, and the control of NOx emission in catalytic cracking flue gas has received more and more attention. [0003] Durin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23G7/06F23G5/02F23G5/46
CPCF23G5/02F23G5/46F23G7/065F23G2201/60F23G2204/103F23G2206/20
Inventor 李玖重孙志钦高晓红高跃成郜建松周天宇
Owner SINOPEC LUOYANG TECH CO LTD