阅读说明：本技术 一种塔顶循环油静电聚集脱盐系统 (Tower top circulating oil electrostatic aggregation desalting system ) 是由 刘建春 刘家诚 韦伟 王洪福 姚磊 卢永生 肖根华 唐超 张立新 许峰 陈影 于 2021-09-10 设计创作，主要内容包括：本发明公开了一种塔顶循环油静电聚集脱盐系统,包括设于分馏塔顶的顶循集油箱,顶循集油箱的出口与混合阀相连,混合阀的前方设有除盐水供给管路,混合阀的后方设有静态混合器,静态混合器分别与电脱盐罐的第一进油口和第二进油口相连,第一进油口和第二进油口的上方设有一个分配器,分配器包括若干根变径管,变径管的管壁上设有出油孔,分配器的上方设有悬挂极板,相邻的悬挂极板分别与变压器的输出端和输入端相连,电脱盐罐的顶部设有第一出油口与第二出油口,第一出油口与第二出油口的下方于电脱盐罐内均设有一个收集器,第一出油口与第二出油口通过管路于顶循油箱的进口相连,电脱盐罐的底部设有集水罐,集水罐与含盐污水排出装置相连。(The invention discloses a tower top circulating oil electrostatic aggregation desalting system, which comprises a top circulating oil collecting tank arranged at the top of a fractionating tower, wherein the outlet of the top circulating oil collecting tank is connected with a mixing valve, a desalted water supply pipeline is arranged in front of the mixing valve, a static mixer is arranged behind the mixing valve, the static mixer is respectively connected with a first oil inlet and a second oil inlet of an electric desalting tank, a distributor is arranged above the first oil inlet and the second oil inlet, the distributor comprises a plurality of reducing pipes, oil outlet holes are formed in the pipe walls of the reducing pipes, a suspension polar plate is arranged above the distributor, adjacent suspension polar plates are respectively connected with the output end and the input end of a transformer, a first oil outlet and a second oil outlet are arranged at the top of the electric desalting tank, a collector is respectively arranged in the electric desalting tank below the first oil outlet and the second oil outlet, and the first oil outlet and the second oil outlet are connected with the inlet of the top circulating oil tank through pipelines, the bottom of the electric desalting tank is provided with a water collecting tank which is connected with a salt-containing sewage discharge device.)

1. A tower top circulating oil electrostatic gathering desalting system is characterized by comprising a top circulating oil collecting tank arranged at the top of a fractionating tower, wherein the top circulating oil collecting tank is provided with an inlet and an outlet, the outlet of the top circulating oil collecting tank is connected with a mixing valve through a pipeline, a desalted water supply pipeline is arranged in front of the mixing valve, a static mixer is arranged behind the mixing valve, the pipeline behind the static mixer is divided into two branches which are respectively connected with a first oil inlet and a second oil inlet of an electric desalting tank, a distributor is arranged in the electric desalting tank above the first oil inlet and the second oil inlet and comprises a plurality of variable-diameter pipes which are communicated in a staggered mode and in a # -shape, the diameter of each variable-diameter pipe gradually decreases towards the periphery by taking the joint of the variable-diameter pipe and the oil inlets as the center, a plurality of oil outlet holes are formed in the pipe wall of each variable-diameter pipe, and a plurality of hanging polar plates distributed at intervals are arranged above the distributors, two adjacent hanging polar plates are respectively connected with the output end and the input end of a transformer arranged outside the electric desalting tank, the top of the electric desalting tank is provided with a first oil outlet and a second oil outlet, a collector is arranged in the electric desalting tank below the first oil outlet and the second oil outlet, the first oil outlet and the second oil outlet are connected with an inlet of a top circulation oil tank through a pipeline, the bottom of the electric desalting tank is provided with a water collecting tank, and the water collecting tank is connected with a salt-containing sewage discharge device.

2. The electrostatic aggregation and desalination system for overhead circulating oil of claim 1, wherein the suspension plates are horizontally or vertically arranged, the suspension plates are made of iron, and the outer surfaces of the suspension plates are coated with organic coatings.

3. The electrostatic aggregation and desalination system for the tower top circulating oil as claimed in claim 2, wherein the transformer is an ac transformer or a variable frequency transformer.

4. The electrostatic concentrating desalination system for overhead circulating oil of claim 1, wherein the transformer is connected to a low level protector.

5. The electrostatic accumulation desalting system for the tower top circulating oil as claimed in claim 1, wherein a blow-down valve is arranged at the top of the electric desalting tank.

6. The electrostatic concentrating and desalting system for overhead circulating oil of claim 1, wherein a flow meter is disposed in front of said mixing valve.

Technical Field

The invention relates to a tower top circulating oil electrostatic aggregation desalting system.

Background

The fractionating tower can fractionate the reacted oil-gas mixture into rich gas, gasoline, light diesel oil, heavy diesel oil, recycle oil, oil slurry and other fractions according to different distillation ranges in the petroleum refining process, and the fractionation process is commonly used in the processes of atmospheric and vacuum distillation, catalytic cracking, coking and the like. The circulating system at the top of the fractionating tower is used for taking away excessive heat at the top of the fractionating tower, and the temperature of materials pumped out from the top is controlled through the heat exchange quantity of the circulating system, so that the qualified purity of the fractionated products is ensured. The material circulating at the top of the fractionating tower returns to the top of the fractionating tower after being subjected to heat exchange and top circulating pump pressurization in a liquid phase state, and the corrosion in the circulating system is more and more concerned.

Disclosure of Invention

The invention aims to solve the defects of the prior art and provides a tower top circulating oil electrostatic accumulation desalting system.

A tower top circulating oil electrostatic gathering desalting system comprises a top circulating oil collecting tank arranged at the top of a fractionating tower, wherein the top circulating oil collecting tank is provided with an inlet and an outlet, the outlet of the top circulating oil collecting tank is connected with a mixing valve through a pipeline, a desalted water supply pipeline is arranged in front of the mixing valve, a static mixer is arranged behind the mixing valve, the pipeline behind the static mixer is divided into two branches which are respectively connected with a first oil inlet and a second oil inlet of an electric desalting tank, a distributor is arranged above the first oil inlet and the second oil inlet in the electric desalting tank and comprises a plurality of variable-diameter pipes which are communicated in a staggered mode and in a # -shape, the diameter of each variable-diameter pipe gradually decreases towards the periphery by taking the joint of the variable-diameter pipe and the oil inlets as the center, a plurality of oil outlet holes are formed in the variable-diameter pipe, a plurality of hanging polar plates which are distributed at intervals are arranged above the distributor, and the adjacent hanging polar plates are respectively connected with the output end and the input end of a transformer arranged outside the electric desalting tank, the top of the electric desalting tank is provided with a first oil outlet and a second oil outlet, a collector is arranged in the electric desalting tank below the first oil outlet and the second oil outlet, the first oil outlet and the second oil outlet are connected with an inlet of a top circulation oil tank through a pipeline, a water collecting tank is arranged at the bottom of the electric desalting tank, and the water collecting tank is connected with a salt-containing sewage discharge device.

As a further improvement, the suspension polar plate is horizontally or vertically arranged, the suspension polar plate is made of iron, and the outer surface of the suspension polar plate is coated with an organic coating.

As a further improvement, the transformer is an alternating current transformer or a variable frequency transformer.

As a further improvement, the transformer is connected with a low liquid level protector.

As a further improvement, the top of the electric desalting tank is provided with a vent valve.

As a further improvement, a flow meter is arranged in front of the mixing valve.

Has the advantages that:

the invention has the advantages of ingenious design, simple equipment flow, convenient modification, less investment and low energy consumption, omits the traditional working procedures of injecting corrosion inhibitor and neutralizer and light sump oil and sewage generated by tower washing operation, reduces the material upgrading cost caused by corrosion of the system, and reduces the running cost of the device and the safety production problem caused by equipment corrosion.

Drawings

FIG. 1 is a schematic diagram of the general structure of an overhead circulating oil electrostatic accumulation desalination system;

1. the tower top 2 of the fractionating tower, a flowmeter 3, a demineralized water supply pipeline 4, a mixing valve 5, a static mixer 6, an oil inlet 7, a distributor 8, a suspension pole plate 9, a transformer 10, an oil outlet 11, a collector 12, a water collecting tank 13, a salt water discharging device 14, a low liquid level protector 15 and an emptying valve.

Detailed Description

For the purpose of enhancing the understanding of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.

As shown in fig. 1, the electrostatic accumulation desalting system for the tower top circulating oil comprises a fractionating tower top 1, a flowmeter 2, a desalted water supply pipeline 3, a mixing valve 4, a static mixer 5, an oil inlet 6, a distributor 7, a suspension pole plate 8, a transformer 9, an oil outlet 10, a collector 11, a water collecting tank 12, a brine discharge device 13, a low liquid level protector 14 and a blow-down valve 15.

A tower top circulating oil electrostatic gathering desalting system comprises a top circulating oil collecting tank arranged at the top of a fractionating tower, wherein the top circulating oil collecting tank is provided with an inlet and an outlet, the outlet of the top circulating oil collecting tank is connected with a mixing valve through a pipeline, a desalted water supply pipeline is arranged in front of the mixing valve, a static mixer is arranged behind the mixing valve, the pipeline behind the static mixer is divided into two branches which are respectively connected with a first oil inlet and a second oil inlet of an electric desalting tank, a distributor is arranged above the first oil inlet and the second oil inlet in the electric desalting tank and comprises a plurality of variable-diameter pipes which are communicated in a staggered mode and in a # -shape, the diameter of each variable-diameter pipe gradually decreases towards the periphery by taking the joint of the variable-diameter pipe and the oil inlets as the center, a plurality of oil outlet holes are formed in the variable-diameter pipe, a plurality of hanging polar plates which are distributed at intervals are arranged above the distributor, and the adjacent hanging polar plates are respectively connected with the output end and the input end of a transformer arranged outside the electric desalting tank, the top of the electric desalting tank is provided with a first oil outlet and a second oil outlet, a collector is arranged in the electric desalting tank below the first oil outlet and the second oil outlet, the first oil outlet and the second oil outlet are connected with an inlet of a top circulation oil tank through a pipeline, a water collecting tank is arranged at the bottom of the electric desalting tank, and the water collecting tank is connected with a salt-containing sewage discharge device.

The suspension polar plate is horizontally or vertically arranged, the suspension polar plate is made of iron, and the outer surface of the suspension polar plate is coated with an organic coating.

The transformer is an alternating current transformer or a variable frequency transformer.

Wherein, the transformer is connected with the low liquid level protector.

Wherein, the top of the electric desalting tank is provided with a vent valve.

Wherein, a flowmeter is arranged in front of the mixing valve.

The process flow of the tower top circulating oil electrostatic aggregation desalting system is as follows:

(1) uniformly dispersing desalted water into the crude oil through a mixing valve and a static mixer;

(2) fully mixing the crude oil and the desalted water to form emulsion, and fully dissolving salt ions in the oil into the water;

(3) the mixed solution of oil and water enters an electric desalting tank, small droplets in the oil are accumulated into large water droplets under the action of an electric field force, and the salt-containing water and the crude oil are gradually layered;

(4) the saline sewage is discharged from the bottom of the electric desalting tank through a discharging device, and the crude oil enters the fractionating tower again from the top of the electric desalting tank.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.