Movable flushing device, flushing method and application

Abstract

According to the movable flushing device, blocked production equipment or pipelines can be flushed, the flushing fluid consumption is reduced, the flushing range is greatly narrowed, the maintenance time is shortened, and the influence on daily production of the device is reduced to the minimum. In addition, after the movable flushing device is matched, a standing flushing system can not be arranged in a part of the area which is not prone to being blocked in the device any more, and device investment can be effectively reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of flushing equipment, and in particular relates to a movable flushing device, a flushing method and an application thereof. Background Art

[0002] In polymer production equipment, the medium often has a high molecular weight, a high melting point and a high viscosity. It is common for the medium to solidify and clog due to long-term residence in the equipment or pipeline or uneven insulation, thus affecting daily production. In view of this situation, it is often considered to configure special flushing pipelines and related supporting equipment at possible clogging points during the construction of the device. When there are many clogging points, this will not only greatly increase the initial construction investment of the device, but also in the actual production process, the flushing range is large due to the fixed flushing pipeline, and the flushing involves many pipelines and equipment, the preparation time is long, and the flushing liquid consumption is large, which leads to a greater impact on the daily production of the device. Summary of the invention

[0003] The present invention provides a movable flushing device that can be used to flush a blocked device or pipeline, which not only reduces the flushing liquid consumption, but also greatly reduces the flushing range in the production device, shortens the maintenance time, and minimizes the impact on the daily production of the device. In addition, after the movable flushing device is equipped, the area inside the industrial production device that is not easy to be blocked does not need to be equipped with a standing flushing system, which can effectively reduce the device investment.

[0004] One of the purposes of the present invention is to provide a movable flushing device, comprising: a mobile cart, a flushing liquid circulation unit and a flushing liquid storage unit connected by pipelines are installed on the mobile cart, and a purification treatment unit is arranged on the pipeline between the flushing liquid circulation unit and the flushing liquid storage unit; the flushing liquid circulation unit is used to transport flushing liquid to flush the device to be flushed and recover the flushing liquid, and the flushing liquid storage unit is used to store fresh flushing liquid and / or recovered flushing liquid that has been purified.

[0005] According to the present invention, in the flushing device:

[0006] The flushing liquid circulation unit comprises a flushing liquid circulation tank, a flushing liquid output pipeline, and a flushing liquid recovery pipeline. A flushing liquid pump is arranged on the flushing liquid output pipeline. The flushing liquid output pipeline is connected to the flushing liquid inlet of the device to be flushed, and the flushing liquid return pipeline is connected to the flushing liquid outlet of the device to be flushed.

[0007] The flushing liquid storage unit includes a flushing liquid storage tank. When the flushing device is used for the first time, a fresh flushing liquid input pipeline is connected to the purification treatment unit through a flushing liquid loading and unloading pump, and fresh flushing liquid is pumped into the flushing liquid storage tank. After pumping, the flushing liquid loading and unloading pump can be removed. In the subsequent flushing process, the flushing liquid can be recycled.

[0008] According to the present invention, in the flushing device:

[0009] The flushing liquid circulation tank and flushing liquid storage tank are pressure vessels, and the container top cover is connected to a pressure control unit, and the pressure control unit can adopt a pressure control method commonly used in the art, such as a nitrogen sealing system; the flushing liquid circulation tank and flushing liquid storage tank are optionally provided with a pressure gauge;

[0010] A heating and heat preservation system may be optionally provided outside the flushing liquid circulation tank and the flushing liquid storage tank to save energy;

[0011] The flushing liquid pump may be a commonly used liquid pump in the art, for example, a screw pump, a gear pump, a centrifugal pump, or a submersible pump; the flushing liquid pump outlet may be provided with a pressure gauge;

[0012] A pre-pump filter is arranged at the inlet of the flushing pump to filter impurities in the flushing liquid to protect the flushing pump; the pre-pump filter can be a common filter in the prior art that can filter out particulate impurities; such as a basket filter, a T-type filter, a Y-type filter or other similar filters.

[0013] The liquid outlet of the flushing liquid pump is also connected to the liquid pipeline of the liquid inlet of the purification treatment unit, and is switched with the flushing liquid output pipeline through a valve;

[0014] A liquid outlet is arranged at the bottom of the flushing liquid storage tank, which is connected to the flushing liquid circulation tank through a pipeline, and is used to transport the flushing liquid in the flushing liquid storage tank to the flushing liquid circulation tank; the liquid outlet at the bottom of the flushing liquid storage tank can adopt a ferrule-to-flange adapter. When the flushing device is not used for a long time, the pipeline can be replaced to drain the flushing liquid in the flushing liquid storage tank.

[0015] The flushing liquid storage tank is provided with a liquid inlet, which is connected to the liquid outlet of the purification treatment unit through a pipeline, and is used to deliver the flushing liquid after the purification treatment to the flushing liquid storage tank for storage;

[0016] The pipeline in the flushing device is preferably a high-pressure rubber tube and / or a metal hose, wherein the metal material is not particularly limited, for example, a commonly used stainless steel tube can be used.

[0017] According to the present invention, in the flushing device:

[0018] A fresh flushing liquid pipeline is also provided on the liquid outlet of the flushing liquid pump and the liquid pipeline connected to the liquid inlet of the purification treatment unit, and the switch of the pipeline is controlled by a valve to switch with the liquid of the flushing liquid pump; preferably, a solvent loading and unloading pump is provided on the fresh flushing liquid pipeline for pumping fresh flushing liquid into the solvent storage tank, and a pressure gauge is optionally provided at the outlet of the solvent loading and unloading pump.

[0019] According to the present invention, in the flushing liquid circulation unit:

[0020] The flushing liquid recovery pipeline is higher than the flushing liquid output pipeline;

[0021] The ports of the flushing liquid recovery pipeline and the flushing liquid output pipeline are both provided with quick-fitting sleeve-to-flange adapters, which are convenient for docking with pipeline flanges;

[0022] At least one loop filter is optionally provided on the flushing liquid recovery pipeline, and the loop filter is at least one of a closed basket filter and a candle filter; in the present invention, the filter is used to collect solid materials brought out when flushing the pipeline or equipment;

[0023] The flushing liquid circulation tank is provided with a heat exchanger; the heat exchanger is an electric heater or a coil heat exchanger. Preferably, the heat exchange tubes in the heat exchanger are perpendicular to the side wall of the container, and the heat exchange tubes pass through the side wall of the container to set a heat source inlet and a heat source outlet; the heat exchanger inlet and outlet are provided with quick connectors for convenient connection with the heat source; in the present invention, the heat exchanger is preferably a coil heat exchanger, and after flushing is completed, the coil heat exchanger can be used as a water cooler for cooling the flushing liquid recovered after flushing is completed;

[0024] The flushing liquid circulation tank is provided with a liquid level gauge and a thermometer; the liquid level gauge and the thermometer may be the liquid level gauge and the thermometer commonly used in the art, for example, a thermometer with a metal protective shell;

[0025] The top cover of the flushing liquid circulation tank is connected to a safety discharge valve. In the present invention, flushing needs to be carried out at a higher temperature. The container used is a pressure vessel with relevant safety facilities (safety discharge valve, discharging to a safe place).

[0026] According to the present invention, in the flushing device:

[0027] The flushing liquid recovered in the flushing liquid circulation tank is transported to the purification unit through a pipeline, and the flushing liquid after the purification is transported to the flushing liquid storage tank for storage;

[0028] The rinsing liquid purification treatment unit includes an impurity filter and an oligomer processor, wherein the impurity filter can be selected from a filter device commonly used in the art, preferably, the impurity filter is selected from one of a basket filter, a T-type filter, a Y-type filter or other similar filters, mainly used to filter the granular solids carried in the rinsing liquid, and the filter mesh number can be selected according to the actual situation of the device; the oligomer processor is an adsorption device filled with molecular sieves or white clay, used to adsorb tiny substances carried in the rinsing liquid (particle diameter <1μm, which cannot be filtered by conventional filters), wherein the molecular sieve used is not particularly limited, and can be selected from the molecular sieves commonly used in the adsorption device in the art. The impurity filter and the oligomer processor are connected in series or in parallel through pipelines, and the impurity filter and the oligomer processor are at least one, and a single unit or multiple units can be selected according to the actual rinsing needs, and the connection mode of series or parallel connection can be selected to achieve the final filtration requirements.

[0029] The present invention can be equipped with a startup loading and unloading pump according to the fire hazard and toxicity of the flushing liquid, so as to facilitate the loading and unloading of the flushing liquid in the flushing liquid storage tank under closed conditions. All equipment, pipelines, instruments, and pipe fittings in the present invention can be designed with appropriate sizes and dimensions according to actual needs. The flushing device of the present invention can be used in the case of high temperature and pressure, and the flushing liquid is flammable and toxic, and is also suitable for non-toxic and non-flammable, normal temperature and pressure working conditions.

[0030] A second object of the present invention is to provide a flushing method for a production device, which is implemented using the above-mentioned movable flushing device.

[0031] According to the present invention, the flushing method comprises:

[0032] (1) Connect the flushing liquid output pipeline, the flushing liquid recovery pipeline and the interface of the pipeline in the production device;

[0033] (2) adjusting the temperature of the flushing liquid in the flushing liquid circulation tank by the heating and insulation system, and adjusting the pressure of the flushing liquid in the flushing liquid circulation tank by the pressure control unit;

[0034] (3) Switch the valve to the flushing liquid output pipeline, turn on the flushing liquid pump, and transport the flushing liquid in the flushing liquid circulation tank to the production device to be flushed for flushing;

[0035] (4) The flushing liquid after flushing is transported to the flushing liquid circulation tank through the flushing liquid recovery pipeline, and the valve is switched to the liquid pipeline connected to the liquid inlet of the purification treatment unit. The flushing liquid after flushing is transported to the purification treatment unit through the flushing liquid pump, and the flushing liquid after purification is transported to the flushing liquid storage tank for storage and standby use.

[0036] According to the present invention, in the flushing method:

[0037] The flushing liquid can be selected according to different production devices and materials used. Preferably, the flushing liquid is at least one of oil, C5-C18 hydrocarbons, ethers, alcohols, aromatic hydrocarbons, and organic acids;

[0038] The heat source is one of electric heating, steam and hot water;

[0039] The temperature in step (2) is 25 to 300° C.;

[0040] The pressure in step (2) is 0 to 10 MPaG;

[0041] When fresh flushing liquid needs to be added, the liquid inlet of the purification treatment unit is connected to the fresh flushing liquid pipeline through valve switching, and the flushing liquid storage tank is replenished with fresh flushing liquid;

[0042] The rinse liquid recovered in step (4) is cooled and then transported to the purification treatment unit. The cooling method can be to use a heat exchanger as a water cooler to cool the recovered rinse liquid.

[0043] In the present invention, the recovered flushing liquid is transported to a purification treatment unit. In the purification treatment unit, the flushing liquid is filtered for impurities and then treated with an oligomer processor to obtain a purified flushing liquid. The purified flushing liquid can be reused to achieve resource recycling.

[0044] According to the present invention, the flow direction of the flushing liquid for flushing production equipment or pipelines is as follows: before flushing, fresh flushing liquid is transported from the flushing liquid storage tank to the flushing liquid circulation tank, which can be transported by gravity or pressure; during the flushing production equipment, the flushing liquid is transported from the flushing liquid circulation tank to the device to be flushed or the pipeline to be flushed through the flushing liquid pump, and the flushing liquid after flushing is transported back to the flushing liquid circulation tank. After the flushing is completed or in the interval between two flushings, the flushing liquid is input from the flushing liquid circulation tank to the purification treatment unit through the flushing liquid pump for purification treatment, and the flushing liquid after purification treatment is transported to the flushing liquid storage tank for storage and standby. If the flushing production equipment is not used for a long time, it can be discharged through the liquid outlet at the bottom of the flushing liquid storage tank.

[0045] A third object of the present invention is to provide the above-mentioned movable flushing device or the above-mentioned flushing method for use in cleaning polymer production equipment.

[0046] The present invention provides two containers, a flushing liquid circulation tank and a flushing liquid storage tank. Fresh flushing liquid is first added to the flushing liquid storage tank, and then flows by gravity or is pressed by nitrogen to the flushing liquid circulation tank. When it is necessary to flush equipment or pipelines, the flushing liquid starts from the flushing liquid circulation tank, enters the equipment or pipeline to be flushed through a flushing liquid pump, and returns to the flushing liquid circulation tank with oligomers after flushing. During the flushing liquid circulation process, the flushing liquid only passes through the pre-pump filter, which is only used to filter the solid waste in the flushing liquid to protect the pump from damage. The filter is an easily detachable type, which is convenient for replacement when blocked. After flushing is completed, the flushing liquid is pumped from the flushing liquid circulation tank to the purification treatment unit. The flushing liquid obtained after purification is stored in the flushing liquid storage tank for use in the next flushing.

[0047] The oligomer removal process in the flushing liquid of the present invention can be carried out between two flushings, and there is no need to empty the equipment completely and then fill it with fresh flushing liquid. In addition, the flushing process and the flushing liquid filtration process can be independent of each other. The slag discharge and replacement of the filtering facilities that require a longer time can be carried out during flushing without affecting the original flushing operation.

[0048] The movable flushing device provided by the present invention can flush the blocked part as soon as possible when a blockage occurs, shortening the maintenance time, reducing the flushing liquid consumption, and minimizing the impact on daily production. When designing the device, some equipment in the flushing device can be reduced according to actual needs, reducing the device investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 A movable flushing device is used in the embodiment.

[0050] Figure 1 Among them, 1-safety discharge valve; 2-flushing liquid circulation tank; 3-coil heat exchanger; 4-purification treatment unit; 5-flushing liquid storage tank; 6-liquid level gauge; 7-thermometer; 8-pre-pump filter; 9-flushing liquid pump; 10-flushing liquid loading and unloading pump; 11-quick connector; 12-pump outlet pressure gauge; 13-mobile cart; 14-heat source inlet; 15-heat source outlet; 16-fresh flushing liquid pipeline; 17-flushing liquid recovery pipeline; 18-flushing liquid output pipeline; 19-nitrogen interface. DETAILED DESCRIPTION

[0051] The present invention is described in detail below in conjunction with specific embodiments. It is necessary to point out that the following embodiments are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made to the present invention by those skilled in the art based on the contents of the present invention still fall within the scope of protection of the present invention.

[0052] Embodiment 1:

[0053] The movable flushing device and flushing method provided by the present invention are described below with reference to the accompanying drawings.

[0054] like Figure 1 As shown, the movable flushing device includes a mobile cart 13, a flushing liquid circulation unit and a flushing liquid storage unit are installed on the mobile cart 13, a purification unit 4 is arranged on the pipeline between the flushing liquid circulation unit and the flushing liquid storage unit, and the purification unit 4 includes a basket filter connected in series and an adsorption device filled with white clay adsorbent; the flushing liquid circulation unit includes a flushing liquid circulation tank 2, a flushing liquid output pipeline 18, and a flushing liquid recovery pipeline 17, a closed basket filter is arranged on the flushing liquid recovery pipeline 17, and a flushing liquid pump 9 (centrifugal pump) is arranged on the flushing liquid output pipeline 18. A pre-pump filter 8 is provided at the inlet of the liquid pump 9, and a pump outlet pressure gauge 12 is provided at the outlet of the flushing liquid pump 9; a nitrogen interface 19 is connected to the top cover of the flushing liquid circulation tank 2 and the flushing liquid storage tank 5, and a quick ferrule-to-flange adapter 11 is provided on the flushing liquid circulation tank 2, and a coil heat exchanger 3 is provided on the side wall of the flushing liquid circulation tank 2 to set a heat source inlet 14 and a heat source outlet 15, and a level meter 6 and a thermometer 7 are provided on the flushing liquid circulation tank 2. A safety discharge valve 1 is connected to the top cover of the flushing liquid circulation tank 2 and the flushing liquid storage tank 5. A fresh flushing liquid pipeline 16 is also provided on the liquid pipeline connected to the liquid inlet of the purification treatment unit 4 at the outlet of the flushing liquid pump 9, and a solvent loading and unloading pump 10 is provided on the fresh flushing liquid pipeline 16. The pipeline material in the flushing device is 304 stainless steel. The flushing liquid used is hexane.

[0055] The above flushing device is used to flush the HDPE (high-density polyethylene) production device. The specific flushing method includes:

[0056] Step 1, connecting the flushing liquid output pipeline, the flushing liquid recovery pipeline and the interface of the pipeline in the production device;

[0057] Step 2, adjusting the temperature of the flushing liquid in the flushing liquid circulation tank by a heat source, and adjusting the pressure of the flushing liquid in the flushing liquid circulation tank by a pressure control unit;

[0058] Step 3, turning on the flushing liquid pump to transport the flushing liquid in the flushing liquid circulation tank to the HDPE production device for flushing;

[0059] Step 4: The flushing liquid after flushing is transported to the flushing liquid circulation tank through the flushing liquid recovery pipeline, and is transported to the purification treatment unit via the flushing liquid pump. The flushing liquid after purification is transported to the flushing liquid storage tank for storage and standby use.

[0060] Among them, the specific dimensions and operating conditions of the flushing device used are as follows:

[0061] (1) The heater is set at a return temperature of 45°C and a power of 5 kW.

[0062] (2) The flushing liquid circulation tank is equipped with an on-site indicating thermometer with a metal protective shell and a measuring range of 0 to 250°C;

[0063] (3) The flushing liquid circulation tank is equipped with an on-site pressure gauge with a range of 0 to 150 kPaG; the flushing liquid circulation pump outlet is equipped with an on-site pressure gauge with a range of 0 to 2.5 MPaG;

[0064] (4) The flushing liquid circulation tank is equipped with an on-site magnetic flap level gauge with a measuring range of 0 to 1000 mm;

[0065] (5) Flushing liquid tank size: DN 800*1200mm, total volume 0.7m 3 , the amount of flushing liquid in the container is 80% of the total volume, which is 0.56m 3 ;

[0066] (6) Flushing liquid circulation tank size: DN500*1200mm, total volume 0.3m 3 , the amount of flushing liquid in the container is 80% of the total volume, which is 0.24m 3 ;

[0067] (7) Flushing liquid pump: flow rate 2.4m 3 / h, outlet pressure 2MPaG;

[0068] (8) Flushing liquid loading and unloading pump: flow rate 1m 3 / h, outlet pressure 0.5MPaG;

[0069] (9) The total length of the circulation system pipeline (including the flushing liquid output pipeline, flushing liquid recovery pipeline, and pipeline to be flushed) is 50m, the pipeline diameter is DN50mm (here the nominal diameter of the pipeline is taken), and the total volume is 0.098m 3 ;

[0070] (10) Excluding the volume of the circulation system pipeline, the remaining flushing liquid volume in the flushing liquid circulation tank is 0.142m 3 Even if a leak occurs, the pump can drain all the flushing liquid in the tank in just 3.55 minutes;

[0071] (11) Select hexane as the flushing liquid, the flushing temperature is 50°C, and calculate the Reynolds number of the flushing liquid in the circulation system pipeline. The Reynolds number calculation formula is as follows:

[0072]

[0073] Where Re is the Reynolds number, dimensionless; d is the equivalent length, which is the inner diameter of the pipe, mm; v is the flow rate of the flushing fluid, m / s; ρ is the density of the flushing fluid, kg / m 3; μ is the kinematic viscosity of the flushing fluid, mm 2 / s.

[0074] The Reynolds number of the flushing liquid in Example 1 was calculated to be >4000, indicating that the liquid phase was in a turbulent state, and the liquid flushing effect was best in a turbulent state.

[0075] Embodiments 2 to 9

[0076] The flushing device and flushing method in Example 1 were used, except that flushing pipelines with different diameters were used, and different flow rates of the hexane flushing liquid in the circulation pipeline were used. The Reynolds number of the hexane flushing liquid was calculated, and the results are shown in Table 1.

[0077] Table 1. Reynolds number of hexane flushing liquid in Examples 1 to 9

[0078]

[0079] It can be seen from the results in Table 1 that the flushing device provided by the present invention can meet the flushing requirements of pipelines of DN20-200.

[0080] Comparative Example 1

[0081] Hexane is used as the flushing liquid, and the bottom discharge pipe of the tower is flushed through the flushing hard pipe installed in advance in the device. The blocked pipe to be flushed has a diameter of 50mm and a length of 50m. Before flushing, the upstream and downstream valves and the pumps, containers and other equipment connected therein must be cut off. During flushing, the valve between the flushing pipeline and the blocked pipeline is opened, and the flushing liquid passes through the blocked pipe from front to back under pressure. After about 1h of flushing, the flushing liquid at the outlet of the blocked pipe is clear, indicating that the flushing is completed. In this flushing, the flushing liquid flow rate is 2.5m / s, the flushing hard pipe diameter is 25mm, and the final flushing liquid consumption is 4.42m 3 The rinse liquid after rinsing can only be treated as waste liquid due to the impurity components contained therein, and the consumption of rinse liquid is much greater than that of Examples 1 to 9, which will cause a waste of resources.

Claims

1. A movable flushing device, characterized in that include: A flushing liquid circulation unit and a flushing liquid storage unit connected by pipelines are installed on the mobile cart, and a purification treatment unit is arranged on the pipeline between the flushing liquid circulation unit and the flushing liquid storage unit; the flushing liquid circulation unit is used to transport flushing liquid to flush the device to be flushed and recover the flushing liquid, and the flushing liquid storage unit is used to store fresh flushing liquid and / or recovered flushing liquid that has been purified.

2. The flushing device according to claim 1, characterized in that: The flushing liquid circulation unit comprises a flushing liquid circulation tank, a flushing liquid output pipeline, and a flushing liquid recovery pipeline. A flushing liquid pump is arranged on the flushing liquid output pipeline. The flushing liquid output pipeline is connected to the flushing liquid inlet of the device to be flushed, and the flushing liquid return pipeline is connected to the flushing liquid outlet of the device to be flushed; and / or, The flushing liquid storage unit comprises a flushing liquid storage tank.

3. The flushing device according to claim 2, characterized in that: The flushing liquid circulation tank and the flushing liquid storage tank are pressure vessels, and the container top cover is connected to a pressure control unit; and / or, A heating and heat preservation system is optionally provided outside the flushing liquid circulation tank and the flushing liquid storage tank; and / or, The flushing liquid pump is one of a screw pump, a gear pump, a centrifugal pump, and a submersible pump; and / or, A pre-pump filter is provided at the inlet of the flushing liquid pump; and / or, The liquid outlet of the flushing liquid pump is also connected to a liquid pipeline of the liquid inlet of the purification treatment unit, and is switched with the flushing liquid output pipeline through a valve; and / or, A liquid outlet is provided at the bottom of the flushing liquid storage tank, which is connected to the flushing liquid circulation tank through a pipeline, and is used to transport the flushing liquid in the flushing liquid storage tank to the flushing liquid circulation tank; and / or, The flushing liquid storage tank is provided with a liquid inlet, which is connected to the liquid outlet of the purification unit through a pipeline, and is used to deliver the flushing liquid after the purification treatment to the flushing liquid storage tank for storage; and / or, The pipeline in the flushing device is a high-pressure rubber tube and / or a metal hose.

4. The flushing device according to claim 3, characterized in that: A fresh flushing liquid pipeline is also provided between the liquid outlet of the flushing liquid pump and the liquid pipeline connected to the liquid inlet of the purification treatment unit, and the switch of the pipeline is controlled by a valve to switch with the liquid of the flushing liquid pump; Preferably, the fresh flushing liquid pipeline is provided with a solvent loading and unloading pump for pumping fresh flushing liquid into the solvent storage tank.

5. The flushing device according to claim 2, characterized in that: In the flushing liquid circulation unit: The flushing liquid recovery pipeline is higher than the flushing liquid output pipeline; and / or, The ports of the flushing liquid recovery pipeline and the flushing liquid output pipeline are both provided with quick-fitting ferrule-to-flange adapters; and / or, At least one loop filter is optionally provided on the flushing liquid recovery pipeline; and / or, The flushing liquid circulation tank is provided with a heat exchanger; and / or, The flushing liquid circulation tank is provided with a liquid level meter and a thermometer; and / or, The top cover of the flushing liquid circulation tank is connected with a safety discharge valve.

6. The flushing device according to claim 5, characterized in that: The loop filter is at least one of a closed basket filter and a candle filter; and / or, The heat exchanger is an electric heater or a coil heat exchanger. Preferably, the heat exchange tubes in the heat exchanger are perpendicular to the side wall of the container, and the heat exchange tubes pass through the side wall of the container to set a heat source inlet and a heat source outlet.

7. The flushing device according to any one of claims 2 to 6, characterized in that: The flushing liquid recovered in the flushing liquid circulation tank is transported to the purification unit through a pipeline, and the flushing liquid after the purification is transported to the flushing liquid storage tank for storage; and / or, The flushing liquid purification treatment unit includes an impurity filter and an oligomer processor. Preferably, the impurity filter is selected from one of a basket filter, a T-type filter, and a Y-type filter; and / or, the oligomer processor is an adsorption device filled with an adsorbent. Preferably, the adsorbent is selected from at least one of a molecular sieve and kaolin; and / or, the impurity filter and the oligomer processor are connected in series or in parallel through a pipeline; and / or, the impurity filter and the oligomer processor are at least one each.

8. A flushing method for a production device, implemented by using the movable flushing device according to any one of claims 1 to 7, preferably, the flushing method comprises: (1) Connect the flushing liquid output pipeline, the flushing liquid recovery pipeline and the interface of the pipeline in the production device; (2) adjusting the temperature of the flushing liquid in the flushing liquid circulation tank by the heating and insulation system, and adjusting the pressure of the flushing liquid in the flushing liquid circulation tank by the pressure control unit; (3) Switch the valve to the flushing liquid output pipeline, turn on the flushing liquid pump, and transport the flushing liquid in the flushing liquid circulation tank to the production device to be flushed for flushing; (4) The flushing liquid after flushing is transported to the flushing liquid circulation tank through the flushing liquid recovery pipeline, and the valve is switched to the liquid pipeline connected to the liquid inlet of the purification treatment unit. The flushing liquid after flushing is transported to the purification treatment unit through the flushing liquid pump, and the flushing liquid after purification is transported to the flushing liquid storage tank for storage and standby use.

9. The flushing method according to claim 8, characterized in that: The flushing liquid is at least one of oil, C5-C18 hydrocarbons, ethers, alcohols, aromatic hydrocarbons, and organic acids; and / or, The heat source is one of electric heating, steam and hot water; and / or, The temperature in step (2) is 25 to 300° C.; and / or, The pressure in step (2) is 0 to 10 MPaG; and / or, When fresh flushing liquid needs to be added, the liquid inlet of the purification treatment unit is connected to the fresh flushing liquid pipeline through valve switching, and the flushing liquid storage tank is supplemented with fresh flushing liquid.

10. Use of the movable flushing device according to any one of claims 1 to 7 or the flushing method according to any one of claims 8 to 9 in cleaning a polymer production device.

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