However, most of the sulfur is abundant in oil residues. Therefore, it is undeniable that delayed coking has become one of the main sources of pollution in oil refineries. It produces a large amount of wastewater during production, which endangers the health of operators and pollutes the surrounding environment. Therefore, in order to implement the scientific concept of development, it is necessary to treat delayed coking wastewater and adopt scientific and reasonable treatment measures and technologies, so as to implement the scientific concept of development.

1. Overview of delayed coking wastewater

1.1 Sources of delayed coking wastewater

The main source of delayed coking wastewater is the residual ammonia produced in the process of coking and gas purification, as well as in the process of chemical product processing.

1.2 Characteristics of delayed coking wastewater

The composition of coking wastewater is complex and extremely unstable, mainly including nitrogen, phenolic and oily substances. Of course, changes in the temperature of the coke oven and the ratio of coal mixing will also cause changes in the composition of the gas. The amount of wastewater will also be affected by fluctuations in the operation of the ammonia evaporator. Wastewater generated during desulfurization and crude benzene production is difficult to treat.

1.3 Hazards of delayed coking wastewater

Delayed coking wastewater contains highly toxic substances that are harmful to water organisms and harmful to the human body, and even some carcinogens. To a large extent, these substances have brought serious harm to the health of staff and surrounding residents. At the same time, because the refinery will also discharge a large amount of waste into the river during the production process, it will bring many negative impacts to the ecological environment. Therefore, it is necessary to treat delayed coking wastewater, and then reduce the harm of wastewater to human beings and the ecological environment, so as to make the ecological environment healthy and sustainable. At the same time, it is also conducive to the implementation of the scientific concept of development and the people-oriented concept is deeply rooted in the hearts of the people. This is an inevitable requirement for refineries to delay coking wastewater treatment, and it is also an inevitable trend of social development.

2. The current treatment method of delayed coking wastewater in refineries in China

2.1 Gravity sedimentation method is adopted

Some refineries treat wastewater through contact cooling tower supply. In the process of coking wastewater treatment, a degreasing water separator is used to separate the wastewater from oil and water in the settling tank. Then the poured cut water is discharged directly into the oily sewage treatment system. However, this method also has certain shortcomings, including the high composition of oil, gas, wax oil and other substances in the water during the blowing and condensation process, and makes the emulsification serious, so that simple gravity settlement is difficult to separate in a short time.

2. 2 Chemical agent treatment method

In the process of delaying coking wastewater in refineries, chemical agent treatment is adopted. The principle of this treatment method is to select the appropriate demulsifier, stir it fully, pick up the stability system of the broken sol, produce the small Xuboi flower, and then add flocculant to make the small flocculant condense into alum flowers, and then add flocculants, the purpose is to make the small flocs condense into alum flowers, so as to achieve the purpose of sedimentation and separation. Of course, in order to improve the flocculation sedimentation effect; A coagulant is usually added. Although most domestic enterprises use this method, this wastewater treatment technology is not yet mature. Therefore, the development of new and extended wastewater treatment methods is an imminent trend of social development, and it is also an inevitable requirement for refineries to delay coking wastewater treatment.

3. The strategy of refinery delay coking wastewater treatment technology

3.1 Treatment of sulfur-containing wastewater

In view of the fact that the current degreasing and decoking powder pretreatment methods generally have problems such as simple process and incomplete treatment, how to improve the influent water quality of wastewater stripping equipment and stabilize the operation of the device has always been a major problem that needs to be solved urgently at home and abroad. For the treatment of delayed coking wastewater in the refinery, steam stripping can be used to remove the sulfur contained in the wastewater. Of course, in order to better develop this technology, a combination device of hydraulic spin-liquid separation and automatic oil slick collection and drainage can be used. Of course, this separation device can make the treated water recycled, so as to achieve the purpose of water conservation and pollution reduction, so as to implement the scientific concept of development, so as to achieve the purpose of comprehensive utilization and sustainable development.

3.2 Sewage expander can be used in the treatment of delayed coking wastewater in refineries

For the treatment of delayed coking wastewater in the refinery, a sewage expander can be used to realize the treatment of wastewater. The wastewater produced in the delayed coking plant comes from the sewage expansion of the boiler and steam generator and the drainage of the cooler, which is an indirect drainage. The working principle of this technology is to separate the secondary steam and waste hot water from the boiler or the waste hot water discharged with a higher pressure than the ranking expander through pressure reduction and expansion.

4. Conclusion

With the continuous development of social economy and the increasing renewal of science and technology, refinery enterprises have been fully developed. However, these enterprises have also encountered many problems in the process of development, such as improper treatment of wastewater, which in turn brings many disadvantages to the people and the ecological environment. Therefore, it is necessary to take scientific and reasonable measures to delay the treatment of coking wastewater in refineries, and constantly innovate technology, so as to make the refinery delay coking wastewater treatment implemented, so as to better promote and implement the scientific concept of development policies, and at the same time make the healthy and sustainable development of enterprises.