A coking wax oil purification device

Abstract

The utility model relates to the field of petroleum chemical coking wax oil processing technology, concretely relates to a coking wax oil purification device, including feed pipeline, purified wax oil output pipeline, multistage filtration module, backflushing device, concentrated liquid processing module and flow control device, multistage filtration module is composed of the primary filtration unit and fine filtration unit of series connection, backflushing device connects multistage filtration module, and coking wax oil enters the primary filtration unit through feed pipe, and large -sized granular impurities are intercepted, preliminary filtrate flows into fine filtration unit, and purified wax oil is obtained after removing glue powder, and pressure sensor real -time monitoring pressure difference between two units, and backflushing device starts, and reverse flushes filter screen, and waste liquid is discharged into buffer tank, and concentrated wax oil enters centrifuge and separates glue powder, and supernatant is filtered through ultrafiltration unit, and the backflow is controlled by flow control device, and stable backflow is to feed end, realize multistage filtration, improve the filtration efficiency to wax oil.

Description

Technical Field

[0001] This utility model relates to the field of petrochemical coking wax oil treatment technology, and in particular to a coking wax oil purification device. Background Technology

[0002] After passing through the wax oil steam generator, the coking wax oil, except for the reflux portion, is entirely sent to the wax oil water tank. After cooling in the water tank, one route goes to the coke tower as quench oil; another route is collected in the sealing oil tank as sealing oil; and the third route is returned to the residue oil inlet pipeline (or redirected to the tank farm). Since all the wax oil is cooled in the water tank, the tank is under heavy load, frequently resulting in high wax oil temperatures and triggering temperature alarms in the tank farm storage tanks.

[0003] Existing technology CN212222875U discloses a coking wax oil production device with adjustable circulation ratio, including a reboiler, a steam source one, a wax oil steam generator, a fractionation tower oil collection tank, a water tank, a cross-line pipeline, a steam source two, a convection chamber, a wax oil feedstock heat exchanger, and an electric desalting tank. Wax oil enters the wax oil steam generator through the reboiler. Steam source one is connected to the wax oil steam generator. After passing through the wax oil steam generator, the coking wax oil is connected to three branches via pipelines. One branch is connected to the fractionation tower oil collection tank via pipeline. Another branch is connected to the pipeline before the feedstock oil enters the convection chamber via a cross-line pipeline and enters the fractionation tower with the feedstock oil. The remaining branch is connected to the water tank. The feedstock oil enters the wax oil feedstock heat exchanger via the electric desalting tank. By modifying the wax oil process, continuous external discharge of wax oil is achieved, and the circulation ratio can be flexibly adjusted. Lowering the circulation ratio can increase the processing capacity of the device. Under the condition of sufficient feedstock, lowering the circulation ratio and increasing the fresh feed can achieve better economic benefits, while providing sufficient feedstock for subsequent devices. To reduce the excessive load on the circulating heater, which can lead to coking in the furnace tubes, it is necessary to determine the appropriate minimum circulation ratio based on the operating conditions of the unit. Ultimately, this will enable flexible control of the diesel final boiling point and wax oil yield, maximizing efficiency.

[0004] However, in actual operation, the above method has problems such as low filtration efficiency, incomplete separation of impurities, and easy impact on the stability of the filtration device due to the return of the concentrated liquid after treatment, which restricts the purification effect and production continuity. Utility Model Content

[0005] The purpose of this invention is to provide a coking wax oil purification device that enables multi-stage filtration during the wax oil filtration process, thereby improving the filtration efficiency, making the separation of impurities more thorough, and improving the filtration effect.

[0006] To achieve the above objectives, this utility model provides a coking wax oil purification device, including a feed pipeline and a purified wax oil output pipeline, as well as a multi-stage filtration module, a backwashing device, a concentrate treatment module and a flow control device. The multi-stage filtration module consists of a primary filtration unit and a fine filtration unit connected in series. The primary filtration unit uses a large-pore filter screen, and the fine filtration unit is equipped with a high-precision filter element. The backwashing device is connected to the multi-stage filtration module and has a built-in pressure monitoring component to detect the pressure difference between the two filtration units in real time. The concentrate treatment module receives the concentrated wax oil discharged from the multi-stage filtration module and is equipped with a centrifugal separation sub-unit and an ultrafiltration sub-unit in sequence. The flow control device is located at the outlet of the concentrate treatment module and stably returns the impurity-removed concentrate to the feed end of the multi-stage filtration module.

[0007] The backwashing device is equipped with an automatic control unit. When the pressure difference exceeds a set threshold, the backwashing program is automatically started. The backwashing medium is purified wax oil or special cleaning liquid.

[0008] The concentrate processing module also includes a drying and compression unit for processing the adhesive powder impurities generated by centrifugation and ultrafiltration.

[0009] A buffer tank is provided between the multi-stage filtration module and the concentrate treatment module. The buffer tank is used to receive backwash waste liquid and concentrated wax oil.

[0010] The fine filtration unit has a filter element precision of 1-10μm, and the primary filtration unit has a filter screen pore size of 50-200μm.

[0011] This utility model discloses a coking wax oil purification device, comprising an inlet pipeline, a purified wax oil outlet pipeline, a multi-stage filtration module, a backwashing device, a concentrate treatment module, and a flow control device. The multi-stage filtration module consists of a primary filtration unit and a fine filtration unit connected in series. The primary filtration unit uses a large-pore filter screen, and the fine filtration unit is equipped with a high-precision filter element. The backwashing device is connected to the multi-stage filtration module and has a built-in pressure monitoring component to detect the pressure difference between the two filtration units in real time. The concentrate treatment module receives the concentrated wax oil discharged from the multi-stage filtration module and is equipped with a centrifugal separation sub-unit and an ultrafiltration sub-unit in sequence. The flow control device is located at the outlet of the concentrate treatment module. The concentrated impurity-removing liquid is stably returned to the feed end of the multi-stage filtration module. During use, the coking wax oil enters the primary filtration unit through the feed pipe, where large particles of impurities are trapped. The preliminary filtrate flows into the fine filtration unit, where the gum powder is removed to obtain purified wax oil. The pressure sensor monitors the pressure difference between the two units in real time. The backwashing device is activated to backwash the filter screen, and the waste liquid is discharged into the buffer tank. The concentrated wax oil enters the centrifuge to separate the gum powder. The supernatant is finely filtered by the ultrafiltration unit and then the return flow is controlled by the flow control device to stably return to the feed end. The gum powder generated by centrifugation and ultrafiltration is dried, compressed, and transported out, thus achieving multi-stage filtration and improving the filtration efficiency of wax oil. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0013] Figure 1 This is a schematic diagram of the overall structure of the coking wax oil purification device according to the first embodiment of this utility model.

[0014] Figure 2 This is a backwash control flowchart of the first embodiment of this utility model.

[0015] Figure 3 This is a schematic diagram of the concentrated liquid processing module according to the first embodiment of this utility model.

[0016] Figure 4 This is a schematic diagram of the flow control device according to the first embodiment of this utility model.

[0017] In the diagram: 100 - Primary filtration unit, 200 - Fine filtration unit, 300 - Backwashing device, 310 - Pressure sensor, 400 - Concentrate processing module, 410 - Centrifuge, 420 - Ultrafiltration unit, 500 - Flow control device, 600 - Buffer tank, 101 - Feed pipeline, 102 - Purified wax oil output pipeline. Detailed Implementation

[0018] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0019] The first embodiment of this application is as follows: Please see Figures 1 to 4 ,in Figure 1 This is a schematic diagram of the overall structure of the coking wax oil purification device. Figure 2 This is the backwash control flowchart. Figure 3 This is a schematic diagram of the concentrate processing module. Figure 4This is a schematic diagram of the flow control device. This utility model provides a coking wax oil purification device: including a feed pipeline 101, a purified wax oil output pipeline 102, a multi-stage filtration module, a backwashing device 300, a concentrate treatment module 400, and a flow control device 500. The multi-stage filtration module consists of a primary filtration unit 100 and a fine filtration unit 200 connected in series. The primary filtration unit 100 uses a large-pore filter screen, and the fine filtration unit 200 is equipped with a high-precision filter element. The backwashing device 300 is connected to the multi-stage filtration module and has a built-in pressure monitoring component to detect the pressure difference between the two filtration units in real time. The concentrate treatment module 400 receives the concentrated wax oil discharged from the multi-stage filtration module and is sequentially equipped with a centrifugal separation sub-unit and an ultrafiltration sub-unit. The flow control device 500 is located at the outlet of the concentrate treatment module 400 and stably returns the purified concentrate to the feed end of the multi-stage filtration module. The aforementioned solution addresses the problems of low filtration efficiency, incomplete impurity separation, and the instability of the filtration device caused by the recirculation of the concentrated liquid after treatment during the filtration of wax oil. These issues restrict the purification effect and production continuity. It is understood that the aforementioned solution can be used to enable multi-stage filtration during the filtration of wax oil, thereby improving the filtration efficiency, making the separation of impurities more thorough, and improving the filtration effect.

[0020] In this specific embodiment, the multi-stage filtration module consists of a primary filtration unit 100 and a fine filtration unit 200 connected in series. The primary filtration unit 100 uses a large-pore filter screen, and the fine filtration unit 200 is equipped with a high-precision filter element. The backwashing device 300 is connected to the multi-stage filtration module and has a built-in pressure monitoring component to detect the pressure difference between the two filtration units in real time. The concentrate treatment module 400 receives the concentrated wax oil discharged from the multi-stage filtration module and is equipped with a centrifugal separation sub-unit and an ultrafiltration sub-unit in sequence. The flow control device 500 is located at the outlet of the concentrate treatment module 400 and stably returns the impurity-removed concentrate to the feed end of the multi-stage filtration module. The filter element precision of the fine filtration unit 200 is 1-10 μm, and the filter screen pore size of the primary filtration unit 100 is 50-200 μm. The primary filtration unit 100 is connected to the feed pipeline 101 and uses a pore size of 100 μm. The filter screen traps large particles of impurities; the fine filtration unit 200 is connected in series and equipped with a 5μm precision filter element to deeply remove rubber powder. The flow control device 500 adjusts the return flow of the impurity-removing concentrate to stabilize the feed concentration at 15-20wt%. In use, coking wax oil enters the primary filtration unit 100 through the feed pipe, where large particles of impurities are trapped; the preliminary filtrate flows into the fine filtration unit 200, where rubber powder is removed to obtain purified wax oil. The pressure sensor 310 monitors the pressure difference between the two units in real time. The backwashing device 300 is activated to backwash the filter screen, and the waste liquid is discharged into the buffer tank 600. The concentrated wax oil enters the centrifuge 410 to separate the rubber powder. The supernatant is finely filtered by the ultrafiltration unit 420 and then the return flow is controlled by the flow control device 500 to stably return to the feed end. The rubber powder generated by centrifugation and ultrafiltration is dried, compressed, and transported out, realizing multi-stage filtration and improving the filtration efficiency of wax oil.

[0021] The backwashing device 300 is equipped with an automatic control unit. When the pressure difference exceeds a set threshold, the backwashing program is automatically started. The backwashing medium is purified wax oil or special cleaning liquid. The backwashing device 300 monitors the pressure difference between the two filter units through the pressure sensor 310. When the pressure difference is ≥0.5MPa, the backwashing program is automatically triggered.

[0022] Secondly, the concentrate processing module 400 also includes a drying and compression unit for processing the gum powder impurities generated by centrifugation and ultrafiltration. The centrifuge 410 removes more than 80% of the gum powder impurities, and the ultrafiltration unit 420 further purifies the concentrate.

[0023] Meanwhile, a buffer tank 600 is provided between the multi-stage filtration module and the concentrated liquid treatment module 400. The buffer tank 600 is used to receive backwash waste liquid and concentrated wax oil, so as to avoid impacting the treatment module.

[0024] When using the coking wax oil purification device of this embodiment, the coking wax oil enters the primary filtration unit 100 through the feed pipe, where large particulate impurities are intercepted; the preliminary filtrate flows into the fine filtration unit 200, where the gum powder is removed to obtain purified wax oil; the pressure sensor 310 monitors the pressure difference between the two units in real time; the backwashing device 300 is activated to backwash the filter screen; the waste liquid is discharged into the buffer tank 600; the concentrated wax oil enters the centrifuge 410 to separate the gum powder; the supernatant is finely filtered by the ultrafiltration unit 420, and the return flow is controlled by the flow control device 500 to stably return to the feed end; the gum powder generated by centrifugation and ultrafiltration is dried, compressed, and transported out, realizing multi-stage filtration and improving the filtration efficiency of wax oil.

[0025] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A coking wax oil purification device, comprising a feed pipeline and a purified wax oil output pipeline, characterized in that, It also includes a multi-stage filtration module, a backwashing device, a concentrate treatment module, and a flow control device. The multi-stage filtration module consists of a primary filtration unit and a fine filtration unit connected in series. The primary filtration unit uses a large-pore filter screen, and the fine filtration unit is equipped with a high-precision filter element. The backwashing device is connected to the multi-stage filtration module and has a built-in pressure monitoring component to detect the pressure difference between the two filtration units in real time. The concentrate treatment module receives the concentrated wax oil discharged from the multi-stage filtration module and is equipped with a centrifugal separation sub-unit and an ultrafiltration sub-unit in sequence. The flow control device is located at the outlet of the concentrate treatment module and stably returns the impurity-removed concentrate to the feed end of the multi-stage filtration module.

2. The coking wax oil purification device as described in claim 1, characterized in that: The backwashing device is equipped with an automatic control unit. When the pressure difference exceeds the set threshold, the backwashing program is automatically started. The backwashing medium is purified wax oil or special cleaning liquid.

3. The coking wax oil purification device as described in claim 1, characterized in that: The concentrate processing module also includes a drying and compression unit for processing the gel powder impurities generated by centrifugation and ultrafiltration.

4. The coking wax oil purification device as described in claim 1, characterized in that: A buffer tank is provided between the multi-stage filtration module and the concentrate treatment module. The buffer tank is used to receive backwash waste liquid and concentrated wax oil.

5. The coking wax oil purification device as described in claim 1, characterized in that: The filter element of the fine filtration unit has a filter element precision of 1-10μm, and the filter screen pore size of the primary filtration unit is 50-200μm.

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