Method and device for treating waste gas in coke cooling water

Abstract

The invention provides a method for processing cold coke waste gas, comprising that (a) under 0.1-0.25MPa, using the cold coke sewage water at 5-55Deg. C to cool the cold coke waste gas from 80Deg. C to less than 100Deg. C, to process first temperature-reduction condensation to obtain a mixture of a first condensed liquid and left waste gas, (b) using the cold coke sewage water at 5-50Deg. C to cool the mixture from 55Deg. C to less than 80Deg. C, to process second temperature reduction condensation to obtain a mixture of a second condensed liquid and left waste gas, (c) processing liquid-liquid separation on the second condensed liquid, to obtain waste phase and oil phase, and discharging the water in the oil phase to obtain separated oil phase, (d) cooling the waste phase via heat exchange under 55Deg. C, to process third temperature reduction condensation to obtain a third condensed waste phase, (e) absorbing the left waste gas. The invention also provides a relative device for processing the cold coke waste gas.

Description

technical field [0001] The invention belongs to the field of oil waste gas treatment, and relates to a coupling treatment method for treating oil waste gas with oil waste water. Specifically, the present invention relates to a treatment method for cold coke waste gas in the petrochemical delayed coking production process, and a device for implementing the method. Background technique [0002] As is well known to those skilled in the petrochemical field, delayed coking is currently one of the main means of converting cheap heavy oil into high value-added light oil products, and it occupies an important position in the world's oil refining industry. Delayed coking is one of the main sources of economic benefits of oil refining complexes, and it is also a heavy oil (abbreviation for heavy oil, the same below) processing method that will be developed in China, the United States and many other countries in the future. However, in the production process of delayed coking, a large...

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Problems solved by technology

[0003] Chinese patent ZL02216056.6 discloses a closed treatment device for delayed coking cold coke water, and Chinese patent application CN1754829A discloses a cold coke sewage treatment method and device. They are all based on solving the problem of cold coke sewage purification and treatment, but they mainly consider The most important thing is the treatment of cold coke wastewater, and the treatment of cold coke waste gas has not been fully considered. Practice has proved that the above-mentioned device has the following shortcomings;

[0005] (2) The condensation process of cold coke waste gas is unreasonably designed, and a large amount of non-condensable gas is directly discharged into the air, causing odorous air pollution

[0006] (3) In the above-mentioned patents and patent applications on cold coke sewage treatment, the cyclone separation device used in the treatment of cold coke sewage did not consider the air flotation enhancement function and gas vaporization and Volume expansion phenomenon (during the cyclone separation process of sulfur-containing and oily sewage, the pressure drop will cause part of the gas in the sewage to vaporize and escape, which will affect the smooth overflow of the oil phase, but the above-mentioned patents and patent applications have not considered this situation)

Therefore, the exhaust gas will prevent the oil phase from being discharged from the oil phase outlet of the cyclone, reduce the efficiency of oil-water separation, and increase the oil concentration of the circulating cold coke water. Repeated circulation in this way will in turn affect the treatment effect of the cold coke water. Significantly affects the efficiency of the cold coke process

[0007] In short, due to the above-mentioned problems existing in the prior art, the problem of scientific purification of cold coke waste gas has not been solved so far, and it is far from meeting the expectations of the industrialization of petrochemical clean production

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