阅读说明：本技术 一种苯乙烯焦油的处理方法 (Treatment method of styrene tar ) 是由 刘洪武 黎树根 李勇军 于 2018-06-13 设计创作，主要内容包括：本发明公开了一种苯乙烯焦油的处理方法,将苯乙烯焦油与燃料油混合获得混合油浆,混合油浆经管线输送至废碱焚烧炉,通过带气冷夹套的油枪雾化,于废碱焚烧炉中燃烧,燃烧所产生的热值由废热锅炉副产饱和蒸汽进入蒸汽管网。通过本发明的处理方法,可以实现苯乙烯焦油的顺利充份的燃烧,最终产生二氧化碳和水,实现环保排放的要求,通过燃烧产生的热值经废热锅炉副产饱和蒸汽进入蒸汽管网,产生附加价值。(The invention discloses a treatment method of styrene tar, which comprises the steps of mixing the styrene tar with fuel oil to obtain mixed slurry oil, conveying the mixed slurry oil to a waste alkali incinerator through a pipeline, atomizing the mixed slurry oil through an oil gun with an air cooling jacket, and burning the atomized slurry oil in the waste alkali incinerator, wherein the generated heat value enters a steam pipe network through a byproduct saturated steam of a waste heat boiler. The treatment method can realize the smooth and sufficient combustion of the styrene tar, finally generate carbon dioxide and water, realize the requirement of environmental protection emission, and generate additional value by leading the heat value generated by the combustion to enter a steam pipe network through the byproduct saturated steam of the waste heat boiler.)

1. A treatment method of styrene tar is characterized in that: the method comprises the steps of mixing styrene tar and fuel oil to obtain mixed oil slurry, conveying the mixed oil slurry to a waste alkali incinerator through a pipeline, atomizing the mixed oil slurry through an oil gun with an air cooling jacket, burning the atomized mixed oil slurry in the waste alkali incinerator, and enabling a heat value generated by burning to enter a steam pipe network through a byproduct saturated steam of a waste heat boiler.

2. The method for treating styrene tar according to claim 1, wherein:

the fuel oil is oil refining catalytic cracking slurry oil.

3. The method for treating styrene tar according to claim 1, wherein:

in the mixed oil slurry, the mass ratio of the styrene tar to the fuel oil is 1: 3-100.

4. The method for treating styrene tar according to claim 3, wherein:

in the mixed oil slurry, the mass ratio of the styrene tar to the fuel oil is 1: 4-20.

5. The method for treating styrene tar according to claim 4, wherein:

the temperature of the mixture of the styrene tar and the fuel oil is 60-100 ℃.

6. The method for treating styrene tar according to claim 5, wherein:

the temperature of the mixture of the styrene tar and the fuel oil is 70-90 ℃.

7. The method for treating styrene tar according to claim 1, wherein:

the oil gun is a straight pipe type oil gun, and an air cooling jacket is arranged outside a straight pipe nozzle of the straight pipe type oil gun.

8. The method for treating styrene tar according to claim 7, wherein:

and a gas cooling gas is introduced into the gas cooling jacket.

9. The method for treating styrene tar according to claim 8, wherein:

the conveying flow rate of the mixed oil slurry is 1-1.5 t/h;

the flow rate of the gas-cooled gas is 100-200m³/h。

10. The method for treating styrene tar according to claim 1, wherein: the temperature of the mixed slurry in the oil gun is controlled to be 80-110 ℃.

Technical Field

The invention discloses a treatment method of styrene tar, belonging to the field of organic hazardous waste treatment.

Background

The styrene tar is the rectification residue produced in the production process of preparing styrene by ethylbenzene dehydrogenation, and the main components of the styrene tar are styrene, styrene polymer, derivatives, polymerization inhibitor and the like, and account for about 1 percent of the styrene yield. Because of the rectification residue, the method has no recycling value.

At present, a part of styrene tar is sent to a heating furnace to be used as fuel for treating the styrene tar by a styrene production enterprise, but the styrene tar is not easy to burn when being used as the fuel, is easy to coke or generate black smoke during burning, causes environmental pollution, does not meet the requirement of the emission of the current environment-friendly gas, and leaves the factory and sells a part of the styrene tar in a waste oil mode. However, with the new edition of the national records of hazardous wastes, styrene tar is listed as a hazardous waste, and the styrene tar can only be arranged to be treated by qualified units. The treatment cost of organic hazardous wastes is 2800-. Large-scale processing cannot be performed.

Chinese patent (application number: 200810042116.6) invented a method and device for recovering low-boiling-point substances from heavy styrene tar, and the light component containing styrene is recovered from the top of the refined styrene tower by using a stripping tower, and its recovery rate is raised by 10-50%.

The Yangyuan and the like develop a new process for extracting crude styrene from styrene tar by utilizing the characteristic that styrene can form ternary azeotrope with certain specific solvents and water, the recovery rate of the styrene can reach more than 92 percent, and the content of the crude styrene is more than 98 percent.

Wuchen et al performed thermal cracking test of styrene tar, heating 1000 g of styrene tar on a water bath to 358K to become fluid, adding the fluid into a cracking kettle, heating the fluid by an open system under normal pressure, gradually heating the fluid to 727K for liquid phase thermal cracking, controlling the boiling point of a product extracted from the top of the tower to be not higher than 463K, refluxing the material with high boiling point, flowing the material into the cracking kettle through a circulating lateral line for repeated cracking, and stopping cracking when the distillate at the top of the tower is little to obtain 700.5 g of the extracted liquid at the top of the tower and 299.0 g of the tower liquid.

Japanese iron and steel chemical company developed a method for exclusively recovering a phenolic polymerization inhibitor from styrene tar. The process is carried out by extracting styrene tar with oxygen-containing organic solvent with less than 6 carbon atoms to form a solvent phase, adding aromatic hydrocarbon to form a mixture, and distilling the mixture.

However, the above studies only can recycle valuable components such as residual styrene and polymerization inhibitor in styrene tar, and most of the remaining waste still needs to be disposed.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a method for treating styrene tar in a large scale without secondary pollution.

In order to achieve the above object, the present invention provides the following:

the method comprises the steps of mixing styrene tar and fuel oil to obtain mixed oil slurry, conveying the mixed oil slurry to a waste alkali incinerator through a pipeline, atomizing the mixed oil slurry through an oil gun with an air cooling jacket, burning the atomized mixed oil slurry in the waste alkali incinerator, and enabling a heat value generated by burning to enter a steam pipe network through a byproduct saturated steam of a waste heat boiler.

By adopting the scheme, the styrene tar can be smoothly and fully combusted, the carbon dioxide and the water are finally generated, the requirement of environmental protection emission is met, and the heat value generated by combustion enters a steam pipe network through the byproduct saturated steam of the waste heat boiler to generate additional value.

In a preferred scheme, the fuel oil is oil refining catalytic cracking slurry oil.

In the preferred scheme, the mass ratio of the styrene tar to the fuel oil in the mixed oil slurry is 1: 3-100.

Preferably, the mass ratio of the styrene tar to the fuel oil in the mixed slurry oil is 1: 4-20.

The styrene tar contains styrene oligomer, and the burning alone can cause wiredrawing and block oil gun holes, so that the burning can not be stably carried out for a long time. Within the above further preferable range, a stable combustion effect can be obtained and a strong styrene tar treating ability can be obtained.

In a preferred embodiment, the temperature of the mixture of the styrene tar and the fuel oil is 60-100 ℃.

More preferably, the temperature of the mixture of the styrene tar and the fuel oil is 70 to 90 ℃.

The inventor finds that the temperature for mixing the styrene tar and the fuel oil has certain influence on the process, the temperature is too low, the mixing is easy to be uneven, and the temperature is too high, so that the styrene tar is further polymerized.

In the preferred scheme, the styrene tar and the fuel oil are uniformly mixed by a circulating pump.

Preferably, the oil gun is a straight tube type oil gun, and an air cooling jacket is arranged outside a straight tube nozzle of the straight tube type oil gun.

In a preferred embodiment, a gas cooling gas is introduced into the gas cooling jacket.

Preferably, the gas-cooled gas is air or nitrogen.

In the preferable scheme, the conveying flow rate of the mixed slurry oil is 1-1.5 t/h.

In a preferred scheme, the flow rate of the gas-cooled gas is 100-200m³/h。

In a preferable scheme, the temperature of the mixed oil slurry in the oil gun is controlled to be 80-110 ℃.

As a further preference, the temperature of the mixed slurry in the oil gun is controlled to be 90-100 ℃.

10-15% of styrene is remained in the styrene tar, after an oil gun extends into an incinerator, the temperature is close to the hearth temperature under the baking of about 1000 ℃, and the styrene is rapidly polymerized at the high temperature, so that the viscosity of the styrene tar is increased, on one hand, the nozzle of the oil gun is blocked, on the other hand, a burner is flamed out, and the burning is not carried out.

According to the technical scheme, the air cooling jacket is additionally arranged outside the straight nozzle of the oil gun, so that the temperature of the mixed slurry oil in the straight nozzle of the oil gun is controlled to be kept within the temperature range of 80-110 ℃, the polymerization of styrene in styrene tar is avoided, and the smooth combustion is ensured.

Preferably, the waste alkali incinerator is a cyclohexanone saponification waste alkali incinerator.

The styrene tar contains sulfide, so that a small amount of sulfur dioxide gas is generated in the incineration process, and the waste alkali incinerator contains a large amount of solid alkali, so that hydrogen sulfide gas can be completely absorbed.

The invention has the beneficial effects that:

the invention adopts a large-scale harmless treatment technology of the styrene tar for the first time. The method has simple process, fully utilizes the heat value, realizes the scale harmless treatment of the styrene tar, prevents the environmental pollution and has great economic benefit.

At present, styrene tar is sent to qualified units for treatment, wherein the treatment cost per ton is 2800-. By the treatment method, huge treatment cost can be saved, and the treated styrene tar can be combusted to produce steam and generate added value.

Drawings

FIG. 1 is a schematic diagram of the process of the present invention.

Wherein: 1-oil tank, 2-incinerator, 3-circulating pump, 4-oil pump

Detailed Description

The following examples further illustrate the invention without limiting it.