Oil tank cleaning device

Abstract

The present invention relates to a tank cleaning device, which comprises a separation device, a temporary tank, a collecting tank, a pipeline assembly, and control valves. The temporary tank is connected to the separation device by a pipeline. The pipeline assembly has several pipelines for connecting an oil supply tank, a tank to be treated, the temporary tank, the separation device, and the collecting tank. Each of the pipelines has at least one control valve for controlling the flow of liquid in the pipeline. The tank cleaning device of the present invention can solve the problem of poor cleaning effect of the known tank cleaning device.

Description

TECHNICAL FIELD

[0001] The present invention relates to a tank cleaning device, and more particularly, to a tank cleaning device for removing sludge from a tank and cleaning the tank. BACKGROUND

[0002] It is well known that, in consideration of safety, a tank for storing fuel oil or crude oil must be cleaned of sludge and cleaned at least every five years in accordance with tank safety regulations in order to check the safety of the structure of the tank. It is well known that a tank for storing refined oil or a tank for storing unrefined oil contains heavy oil, sand, and sludge.

[0003] For example, in the case of a tank in a refinery, since the tank is a closed space, if the oxygen concentration is less than 18% vol (the volume of oxygen in air is less than 18%), workers in the tank can suffer from oxygen deficiency, which can cause accidents such as death. Therefore, a mechanical device is used to remove sludge and clean the tank without workers entering the tank.

[0004] Referring to Figure 1 , it is a well-known mechanical device 9 for removing sludge from a tank. The well-known mechanical device 9 has a supply tank 91, a treatment tank 92, and a temporary storage tank 93, the supply tank 91 has heavy oil and light oil inside, and the light oil floats on the heavy oil; the supply tank 91 and the treatment tank 92 are connected by a delivery pipe 94a, the treatment tank 92 and the temporary storage tank 93 are connected by a delivery pipe 94b, and the temporary storage tank 93 and the supply tank 91 are connected by a delivery pipe 94c to form a closed loop.

[0005] The delivery pipe 94a includes a first on-off valve 95a, a first pump 96a, a heater 98, and a first check valve 97a, the first check valve 97a is located between the heater 98 and the supply tank 91; the delivery pipe 94b includes a second on-off valve 95b provided on the side wall of the treatment tank 92, a third on-off valve 95c provided on the side wall of the treatment tank 92, a fourth on-off valve 95d provided on the side wall of the treatment tank 92, a fifth on-off valve 95e provided on the side wall of the treatment tank 92, a sixth on-off valve 95f, and a second check valve 97b; the delivery pipe 94c includes a seventh on-off valve 95g, a second pump 96b, and a third check valve 97c; the seventh on-off valve 95g and the second pump 96b are adjacent to the temporary storage tank 93, and the third check valve 97c is adjacent to the supply tank 91.

[0006] When in use, the first, second, third, fourth, fifth, sixth and seventh switch valves 95a, 95b, 95c, 95d, 95e, 95f and 95g are opened first to allow the light oil inside the supply tank 91 to be pumped out by the first pump 96a as a flushing cleaning carrier, and to flow through the delivery pipe 94a, the check valve 97a and the heater 98 to heat the flushing cleaning carrier to about 60°C, so as to heat dissolve the sludge in the to-be-processed oil tank 92 and reduce the viscosity of the sludge, so that the sludge can be easily carried out of the to-be-processed oil tank 92 by the flushing cleaning carrier.

[0007] In addition, since the temporary storage tank 93 is provided with a third pump 96c, the temporary storage tank 93 can be pumped by the third pump 96c to form a negative pressure inside, so that the flushing cleaning carrier and the sludge in the to-be-processed oil tank 92 can flow into the temporary storage tank 93 in the form of a mixed liquid (hereinafter referred to as "original liquid") through the delivery pipe 94b. Then, the original liquid is pumped out by the second pump 96b and flows through the third check valve 97c to be input into the supply tank 91 for storage for refining processing.

[0008] This cycle is repeated several times until the sludge above the liquid level of the switch valves 95b, 95c, 95d and 95e provided on the side wall of the to-be-processed oil tank 92 is completely removed, and then hot water is sprayed to clean the inner wall of the to-be-processed oil tank 92 for safety inspection of the structure of the oil tank. In this way, the sludge that would have been discarded as waste can be recycled for refining, which not only conforms to the concept of environmental protection but also increases profits, achieving multiple goals at once.

[0009] However, the above-mentioned conventional mechanical equipment 9 can only move the sludge in the to-be-processed oil tank 92 to the supply tank 91, and at most only moves the sludge, and cannot separate and process the oil and sludge, so the amount of sludge cannot be reduced and only increases, which is not ideal.

[0010] Furthermore, Taiwan Patent No. I765079 discloses a method for treating sludge in an oil supply tank. The method includes six steps that can be independently operated: (1) sludge pretreatment step, which is a pretreatment of filtering and homogenizing the sludge. The method is to filter out large solid objects such as large stones, screws, iron pieces, etc. from the sludge, and to preheat the sludge in a preheating tank to make the sludge flowable. (2) cyclone three-phase separation step, which is connected to the sludge pretreatment step. High-temperature steam is used as a scrubbing agent to heat the sludge in a cyclone tank of a cyclone three-phase separator to dissolve and suspend hydrocarbons, evaporate wastewater, and volatilize petroleum gas, so that oil, water, solid waste, and petroleum gas can be separated. (3) petroleum gas oxidation and incineration step, which uses a thermal oxidation incineration device to oxidize and incinerate the petroleum gas produced by the cyclone three-phase separator. (4) liquid catalyst extraction step, which is applied to the solid waste containing porous structures and highly viscous hydrocarbons after the oil and water are separated in the cyclone three-phase separation step. A micro-bubble extraction step is used in combination with liquid catalyst to let the micro-bubbles with a particle size of 20 microns (0.02 mm) carry liquid catalyst into the pores of the solid waste, and extract all the hydrocarbons and oil remaining on the surface and in the pores of the porous solid waste. (5) liquid catalyst recovery step, which includes a two-stage molecular distillation technique to recover the liquid catalyst for recycling in the liquid catalyst extraction step, and to make the separated and recovered crude oil free of liquid catalyst. (6) wastewater treatment step, which is connected to the cyclone three-phase separation step. The wastewater produced by the cyclone three-phase separator is treated. The wastewater treatment step includes a precise oil-water separation step, an activated carbon adsorption step, and an anion-cation exchange step to remove all the hydrocarbons remaining in the wastewater, and the discharged water can be recycled and reused.

[0011] The method disclosed in the above patent case uses high-temperature steam at 135°C as a scrubbing agent to perform scrubbing and heating of the oil sludge in a cyclone tank of a cyclone three-phase separator to dissolve and suspend hydrocarbons, evaporate wastewater, and volatilize petroleum gas, thereby separating oil, water, solid waste, and petroleum gas. The petroleum gas produced by the cyclone three-phase separator is extracted and collected, and then oxidized and combusted by a thermal oxidation combustion device connected to propane gas. This method requires a heating device to heat the oil and water to superheated steam at 135°C, and a thermal oxidation combustion device connected to propane gas to oxidize and combust the petroleum gas produced by the cyclone three-phase separator. The composition of the above method is not only complex, but also produces harmful gases of volatile organic compounds (VOCs) when the oil and water are heated to 135°C, resulting in high cost of construction work and potential environmental pollution.

[0012] Chinese Patent No. CN106746419A discloses a "large-scale pyrolysis treatment system for oil-containing sludge" including a feed pre-selection unit for secondary screening and solid-liquid separation of oil-containing sludge, a drying and pyrolysis unit for drying and pyrolysis reaction of oil-containing sludge, a dust removal and condensation unit for dust removal and condensation of pyrolysis gas mixture produced by the drying and pyrolysis unit, and a discharge treatment unit receiving and treating the separated materials from other units. The large-scale pyrolysis treatment system for oil-containing sludge must have a heating boiler to produce a pyrolysis temperature of 180°C to 200°C, and a combustion chamber with a gas burner to treat harmful tail gas, resulting in high cost of construction work and potential environmental pollution.

[0013] CN106957136A discloses a method for treating oily sludge, which comprises heating and stirring the oily sludge, performing solid-liquid separation after standing, obtaining oily sludge and oily liquid, introducing the oily liquid into a sewage treatment system for oil-water separation, extracting and purifying the separated oil, adding a reagent to the oily sludge for conditioning, performing deep dewatering after conditioning, obtaining dewatered oily sludge and filtrate, and performing oil-water separation on the filtrate. The dewatered oily sludge is subjected to drying treatment and pyrolytic carbonization treatment. The method for treating oily sludge needs to heat the material to above 500°C under anaerobic conditions to make the oily sludge boil and evaporate by using pyrolysis, but there is a azeotropic problem of water and oil in the oily sludge at this temperature, so the produced wastewater contains a high proportion of oil content, and the recovered oil also contains a high proportion of water content. Therefore, if the oil is to be recovered, it must be reprocessed, or several "recycle distillation" structures are added to the condensation tower section of the pyrolysis tower. In this way, the treatment equipment of the method for treating oily sludge becomes very complex, and the operation cost is greatly increased.

[0014] CN108275859A discloses a continuous oily sludge environmental protection treatment process, which comprises pyrolysis of the oily sludge at high temperature, including first pyrolysis and second pyrolysis. The absolute pressure of the first pyrolysis is 750-850 hundred Pa (hPa), and the temperature is 100-150°C. The absolute pressure of the second pyrolysis is less than 45 hundred Pa, and the temperature is 150-300°C. The pyrolysis waste residue and pyrolysis steam are obtained. The pyrolysis waste residue and pyrolysis steam are put into a combustion chamber for first combustion treatment. After the pyrolysis waste residue and pyrolysis steam are cooled for 10 minutes, the second combustion treatment is performed in the combustion chamber. In this way, the method for treating oily sludge must have a heating device to generate a pyrolysis temperature of 100-300°C, and must have a combustion chamber device to perform the first combustion treatment and the second combustion treatment. The equipment of the method for treating oily sludge is not only complex, but also produces harmful gases of volatile organic compounds when the oil and water are heated to above 100°C, which not only causes high operation cost, but also causes environmental pollution. SUMMARY

[0015] To solve the above problems, one main object of the present application is to provide an oil tank cleaning device which does not need personnel to enter the oil tank for cleaning operation to avoid accidents.

[0016] Another object of the present application is to provide an oil tank cleaning device which can effectively remove the oily sludge in the oil tank.

[0017] Still another object of the present application is to provide an oil tank cleaning device which can separate and treat the oily sludge in the oil tank to recover the treated clear liquid, so as to meet the environmental protection concept and increase the income.

[0018] Another object of the present application is to provide a tank cleaning device which can avoid the generation of harmful gases of volatile organic compounds and environmental pollution, and can reduce the cost of construction work.

[0019] The directional or approximate terms described throughout the present application, such as "front", "back", "left", "right", "up (top)", "down (bottom)", "inner", "outer", "side", etc., are mainly with reference to the directions of the accompanying drawings, and each directional or approximate term is only used to assist in describing and understanding each embodiment of the present application, and is not intended to limit the present application.

[0020] The quantifier "one" or "a" used throughout the present application is only for the convenience of use and to provide the general meaning of the scope of the present application; in the present application, it should be interpreted as including one or at least one, and the single concept also includes the case of plurality, unless it is obviously intended to mean otherwise.

[0021] The approximate terms such as "combine", "combine" or "assemble" described throughout the present application mainly include the type of still separable without damaging the components after connection, or the type of making the components inseparable after connection, which can be selected by a person skilled in the art according to the material of the components to be connected or the assembly requirements.

[0022] The "control valve" described throughout the present application is only used in the description to describe that the control valve on the pipeline through which the fluid or carrier needs to pass is opened, and the remaining control valves through which the fluid or carrier does not need to pass are closed, so that the fluid or carrier cannot pass through the unopened control valves.

[0023] The "one-way valve" described throughout the present application is only used in the description to describe that the fluid or carrier can pass through in the forward flow direction, and the one-way valve has the function of preventing the fluid or carrier from passing through in the reverse direction.

[0024] The "above the second control valve" and "below the second control valve" described throughout the present application have a distance of about 50 cm from the bottom of the oil tank of the second control valve, so that based on whether the liquid in the oil tank to be treated can flow out of the second control valve, the position above the liquid level is "above the second control valve", and the position below the liquid level is "below the second control valve".

[0025] The "separation device" described throughout the present application has been described in the application No. 202211661900.1, entitled "Multi-stage circulating separation device", filed by the applicant of the present application with the State Intellectual Property Office of China, and the present application discloses the entire technical content of the application, including the "separation device", and regards it as a part of the present application, which is hereby incorporated by reference.

[0026] The oil tank cleaning device of the present application comprises a separation device, a temporary storage tank, a collection tank, a pipeline assembly, and control valves. The separation device comprises a cylinder tank, cyclones, pressure pumps, and a pipeline module. The cylinder tank has an upstream end and a downstream end. The interior of the cylinder tank is partitioned by partitions into a raw liquid chamber and treatment liquid chambers arranged from the upstream end to the downstream end. The cyclones each have at least one discharge port and at least one return port. The discharge ports of the cyclones are respectively connected to the treatment liquid chambers. The pipeline module connects the cylinder tank, the cyclones, and the pressure pumps. Fluid in the cylinder tank is pumped by the pressure pumps closer to the upstream end to the corresponding cyclones. Fluid with a relatively large specific gravity is input into the corresponding treatment liquid chamber through the discharge port of the cyclone and is pumped by the next pressure pump to the next cyclone to be sequentially transported to the downstream end. Fluid with a relatively small specific gravity is transported back to the cylinder tank through the return port of the cyclone to the upstream end to continue the separation work. The temporary storage tank is pumped by a first pump to remove air from the temporary storage tank to form a negative pressure state. The collection tank is used to receive fluid output from the temporary storage tank. The pipeline assembly has pipelines to connect an oil supply tank, a tank to be treated, the temporary storage tank, the separation device, and the collection tank. Each pipeline has at least one control valve to control the flow of liquid in the pipeline.

[0027] Accordingly, the oil tank cleaning device of the present application can clean the oil tank without personnel entering the tank, thereby avoiding accidents. The arrangement of the pipelines allows the carrier to circulate and repeatedly clean the tank to be treated, thereby effectively removing the sludge in the tank. After the sludge is separated and treated, the treated clear liquid can be recovered, thereby achieving the effects of conforming to the environmental protection concept and increasing the income by avoiding the waste of sludge.

[0028] In an embodiment of the oil tank cleaning device of the present application, the collection tank further has a heater to heat the fluid passing through the collection tank. Thus, the heater can heat the flushing and washing carrier to achieve the effect of easily flushing and washing the sludge in the tank to be treated by the carrier.

[0029] In an embodiment of the oil tank cleaning device of the present application, the heating temperature is about 60°C. Thus, the harmful gases of volatile organic compounds generated by the high-temperature heating of the mixed liquid can be avoided, thereby achieving the effect of avoiding environmental pollution.

[0030] In one embodiment of the oil tank cleaning device of the present application, the pipeline assembly includes a first pipeline for outputting the liquid inside the oil supply tank, a second pipeline connecting the oil tank to be treated and the input end of the connection pipe, a feed pipe connected between the input end of the connection pipe and the on-off valve of the connection pipe, the other end of the feed pipe being connected to the raw liquid chamber of the separation device, a third pipeline connecting the outlet of the temporary storage tank and the oil supply tank, a fourth pipeline connecting the third pipeline and an input end of the collection tank, wherein the fourth pipeline is connected to the third pipeline again at a middle position, so that the fourth pipeline between the two connection positions forms a front fourth pipeline, and the second connection position and the collection tank form a rear fourth pipeline, a fifth pipeline connecting a first output end of the collection tank to deliver the liquid to the oil tank to be treated, a discharge pipe connected between the on-off valve of the connection pipe and the first one-way valve, and the other end of the discharge pipe being connected to the first treated liquid chamber, and a sixth pipeline connecting a second output end of the collection tank and the third pipeline. In this way, the oil tank cleaning device of the present application can have multiple cleaning modes by the pipeline assembly.

[0031] The oil tank cleaning device of the present application can further include a plurality of pumps, including a second pump in the front fourth pipeline, a third pump in the fifth pipeline, and a fourth pump in the sixth pipeline. In this way, the plurality of pumps can be used to generate suction and pressure to make the liquid flow quickly and have a better flushing effect.

[0032] In one embodiment of the oil tank cleaning device of the present application, the control valve includes a first control valve in the first pipeline, at least a second control valve for controlling the discharge of the liquid in the oil tank to be treated, an on-off valve in the connection pipe, a third control valve in the third pipeline, a fourth control valve in the front fourth pipeline, a fifth control valve in the rear fourth pipeline, a sixth control valve, a seventh control valve in the fifth pipeline, an on-off valve in the discharge pipe, and an eighth control valve in the sixth pipeline. In this way, each control valve can be used to control whether the liquid passes through, so that the oil tank cleaning device of the present application has the effect of multiple cleaning modes.

[0033] In one embodiment of the oil tank cleaning device of the present application, the output end of the first pipeline is connected to the rear fourth pipeline and located between the fifth control valve and the sixth control valve. In this way, the light oil in the first pipeline can be used as a carrier to flush the oil tank to be treated.

[0034] The oil tank cleaning device of the present application can further comprise a supplemental device, and the pipeline assembly further comprises a seventh pipeline connecting the first pipeline and the supplemental device, and an eighth pipeline connecting the seventh pipeline and the fifth pipeline. Thus, the carrier supplied by the supplemental device can be used to flush the oil tank to be treated.

[0035] In an embodiment of the oil tank cleaning device of the present application, the seventh pipeline has a ninth control valve and a tenth control valve. Thus, when the dissolving cleaning carrier does not need to be heated by the heater or the collection tank fails, the carrier route can be changed by the seventh pipeline and the ninth control valve and the tenth control valve to achieve the flushing effect on the oil tank to be treated.

[0036] In an embodiment of the oil tank cleaning device of the present application, one end of the eighth pipeline is connected to the fifth pipeline between the seventh control valve and the third pump, and the other end of the eighth pipeline is connected to the seventh pipeline between the ninth control valve and the tenth control valve. Thus, the carrier route can be changed by the seventh pipeline and the eighth pipeline to achieve the flushing effect on the oil tank to be treated.

[0037] In the oil tank cleaning device of the present application, the separation device is used for cleaning the oil tank without entering the oil tank. The solid material in the sludge in the oil tank to be treated can be separated without being brought back to the oil tank, so that the sludge does not accumulate more and more. In addition, the multi-stage circulating separation device of the present application uses the relatively small and clean clarified liquid after multi-stage separation as a supplemental dissolving cleaning carrier, so that the pipeline module and the plurality of pressure pumps are not easily damaged or fail due to long-term circulation of the original liquid containing suspended impurities, and the work period is not affected and the quality control is not good. In addition, the multi-stage circulating separation device of the present application has a simple structure, which helps to reduce the cost of the device, and has a small size but can continuously process a large amount of sludge, which is very ideal.

[0038] In the separation device of the present application, each of the partitions can have an overflow hole. In any two adjacent partitions, the overflow hole position of the partition closer to the downstream end can be higher than the overflow hole position of the partition closer to the upstream end. Thus, if the fluid level in the treatment liquid chamber closer to the downstream end is too high, it can flow to the left treatment liquid chamber to avoid industrial safety accidents caused by space overload, and more fluid can be accumulated in the treatment liquid chamber closer to the downstream end, which has the effects of improving safety and practicality.

[0039] In the separation device of the present application, the plurality of treatment liquid chambers can be sequentially a first treatment liquid chamber, a second treatment liquid chamber, a third treatment liquid chamber and a fourth treatment liquid chamber from the upstream end to the downstream end. The plurality of cyclones can include: a first cyclone having its discharge port located in the second treatment liquid chamber; a second cyclone having its discharge port located in the third treatment liquid chamber; and a third cyclone having its discharge port located in the fourth treatment liquid chamber. In this way, the fluid in the raw liquid chamber can be gradually subjected to multi-stage cyclone separation treatment, thereby improving the separation efficiency.

[0040] In the separation device of the present application, the piping module can include a feed pipe communicating a connection pipe with the raw liquid chamber, and a discharge pipe communicating the connection pipe with the first treatment liquid chamber. In this way, the raw liquid can be easily fed into the barrel, and the treated clear liquid can be easily discharged from the barrel, thereby reducing the cost, improving the assembly and maintenance convenience, and the like.

[0041] In the separation device of the present application, the backflow port of the first cyclone can be connected to a backflow pipe, and a three-way valve can be provided on the backflow pipe to switch the flow of backflow fluid into the raw liquid chamber or the first treatment liquid chamber. In this way, the backflow fluid can be used as a flushing cleaning carrier for supplementing the raw liquid chamber as needed.

[0042] In the separation device of the present application, the number of backflow ports of the second cyclone can be two, one of which can be connected to the raw liquid chamber by a backflow pipe, and the other of which can be connected to the second treatment liquid chamber by another backflow pipe. In this way, a part of the clear liquid separated by the second cyclone can be used as a flushing cleaning carrier for supplementing the raw liquid chamber, and another part can be used as a flushing cleaning carrier for supplementing the second treatment liquid chamber.

[0043] In the separation device of the present application, the backflow port of the third cyclone can be connected to the second treatment liquid chamber by a backflow pipe. In this way, the clear liquid separated by the third cyclone can be used as a flushing cleaning carrier for supplementing the second treatment liquid chamber.

[0044] In the separation device of the present application, the plurality of pressure pumps can include: a first pressure pump connected to the raw liquid chamber by a suction pipe and to the first cyclone by a delivery pipe; a second pressure pump connected to the second treatment liquid chamber by another suction pipe and to the second cyclone by another delivery pipe; and a third pressure pump connected to the third treatment liquid chamber by yet another suction pipe and to the third cyclone by yet another delivery pipe. In this way, the raw liquid can be subjected to three-stage cyclone separation treatment by a simple structure, thereby reducing the cost, improving the assembly and maintenance convenience, and the like.

[0045] The separation device of the present application can further comprise a solid-liquid separator, wherein a pressurizing pump can be connected to the liquid treatment chamber adjacent to the downstream end by a suction pipe, and the pressurizing pump can be connected to the solid-liquid separator by a delivery pipe. In this way, the solid in the raw liquid can be separated out and removed easily, thus improving the separation efficiency and the operation convenience.

[0046] The separation device of the present application can further comprise a liquid collecting tank, and the solid-liquid separator can be connected to the liquid collecting tank by a liquid delivery pipe, and the liquid collecting tank can be connected to the third liquid treatment chamber by a return pipe. In this way, the liquid separated out by the solid-liquid separator can be used as the flushing cleaning medium carrier for one of the liquid treatment chambers, thus improving the separation efficiency and reducing the operation cost. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 A diagram of a known mechanized equipment used in a method for removing sludge from an oil tank.

[0048] Figure 2 A diagram of the present application used in combination with a known mechanized equipment.

[0049] Figure 3 A perspective view of a preferred embodiment of the separation device of the present application.

[0050] Figure 4 A side sectional view of a preferred embodiment of the separation device of the present application.

[0051] Figure 5 A first cleaning method of the present application used in combination with a known mechanized equipment.

[0052] Figure 6 A second cleaning method of the present application used in combination with a known mechanized equipment.

[0053] Figure 7 A third cleaning method of the present application used in combination with a known mechanized equipment.

[0054] Figure 8 A fourth cleaning method of the present application used in combination with a known mechanized equipment.

[0055] Figure 9 A fifth cleaning method of the present application used in combination with a known mechanized equipment.

[0056] Figure 10 A sixth cleaning method of the present application used in combination with a known mechanized equipment.

[0057] Figure 11 A seventh cleaning method of the present application used in combination with a known mechanized equipment.

[0058] Figure 12 A diagram of a known mechanized equipment used in a method for removing sludge from an oil tank. Figure 4Figure 2 is an enlarged view of the local structure of the A area of Figure 1.

[0059] BRIEF DESCRIPTION OF DRAWINGS

[0060] 1 - separation device; 11 - cylinder tank; 11a - upstream end; 11b - downstream end; 111 - filter; 112 - cleaning port; 113 - partition; 1131 - overflow hole; 114, 171, 931 - sensor; 115 - manhole; 116 - manhole cover; 12 - cyclone; 12a - first cyclone; 12b - second cyclone; 12c - third cyclone 121 - discharge port; 122 - backflow port; 13 - pressurizing pump; 13a - first pressurizing pump; 13b - second pressurizing pump; 13c - third pressurizing pump; 13d - fourth pressurizing pump; 14 - piping module; 141 - connecting pipe; 1411, 1421, 1431, 1442, 1451 - on-off valve; 142 - feed pipe; 143 - discharge pipe; 144 - backflow pipe; 1441 - three-way valve; 145 - extraction pipe; 146, 94a, 94b, 94c, 94d - delivery pipe; 1461 - check valve; 147 - infusion pipe; 15 - agitator; 16 - solid-liquid separator; 17 - liquid collection tank; 2 - collection tank; 2a - input end; 2b - first output end; 2c - second output end; 21, 98 - heater; 3 - piping assembly; 31 - first piping; 32 - second piping; 33 - third piping; 34 - fourth piping; 34a - front fourth piping; 34b - rear fourth piping; 35 - fifth piping; 36 - sixth piping; 37 - seventh piping; 38 - eighth piping; 41, 96c - first pump; 42, 96b - second pump; 43 - third pump; 44 - fourth pump; 96a - fifth pump; 51 - first control valve; 52 - second control valve; 53 - third control valve; 54 - fourth control valve; 55 - fifth control valve; 56 - sixth control valve; 57 - seventh control valve; 58 - eighth control valve; 59 - ninth control valve; 510 - tenth control valve; 61 - first check valve; 62 - second check valve; 63 - third check valve; 64 - fourth check valve; 65 - fifth check valve; 66 - sixth check valve; 7 - supplementary device; 91 - oil supply tank; 92 - oil to be treated tank; 93 - temporary storage tank; T - detection valve; 9 - mechanized device; 95a - first on-off valve (also referred to as first control valve 51); 95b - second on-off valve (also referred to as second control valve 52); 95c - third on-off valve (also referred to as second control valve 52); 95d - fourth on-off valve (also referred to as second control valve 52); 95e - fifth on-off valve (also referred to as second control valve 52); 95f - sixth on-off valve; 95g - seventh on-off valve; 97a - first check valve; 97b - second check valve; 97c - third check valve; S1 - raw liquid chamber; S2 - treated liquid chamber; S21 - first treated liquid chamber; S22 - second treated liquid chamber; S23 - third treated liquid chamber; S24 - fourth treated liquid chamber. Detailed Implementation

[0061] To make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments of the present invention are described below in conjunction with the accompanying drawings; in addition, those symbols that are used in different drawings are considered to be the same and their descriptions will be omitted.

[0062] Please refer to Figure 2 As shown, this is a preferred embodiment of the oil tank cleaning device of the present invention used in conjunction with well-known mechanized equipment. It includes a separation device 1, a collection tank 2, a pipeline assembly 3 and at least one control valve. The pipeline assembly 3 is divided into several pipelines that connect the above-mentioned related components to form several liquid passages. The control valve is used to control whether the liquid in each pipeline flows.

[0063] The oil tank cleaning device of the present invention is equipped with a well-known oil supply tank 91, an oil tank to be treated 92, and a temporary storage tank 93. The oil supply tank 91 can store heavy oil and light oil, with the light oil floating on top of the heavy oil. The oil tank to be treated 92 can be any well-known oil tank that needs to be cleaned. The temporary storage tank 93 is used to receive the mixture formed from the rinsing and cleaning material carrier and the sludge in the oil tank to be treated 92, or the clarified liquid after separation and treatment by the separation device 1, or to transport the raw liquid or the clarified liquid to the oil supply tank 91 for storage for refining processing, or to transport the raw liquid or the clarified liquid to the collection tank 2, and then to the oil tank to be treated 92 to rinse the oil tank to be treated 92. Preferably, the temporary storage tank 93 may also be equipped with a sensor 931, which is electrically connected to a controller (not shown) and can be used to detect the liquid level in the temporary storage tank 93. If the sensor detects that there is no liquid inside the temporary storage tank 93, it will activate the controller to stop the entire oil tank cleaning device.

[0064] Please refer to Figure 3 , Figure 4 As shown, it is a preferred embodiment of the separation device 1 of the present invention, which includes a cylindrical tank 11, a plurality of hydrocyclones 12, a plurality of pressurizing pumps 13 and a pipeline module 14, the pipeline module 14 connecting the cylindrical tank 11, the plurality of hydrocyclones 12 and the plurality of pressurizing pumps 13.

[0065] The cylindrical tank 11 has an upstream end 11a and a downstream end 11b. The cylindrical tank 11 may be provided with a filter 111 at the upstream end 11a to filter out impurities in the fluid entering the cylindrical tank 11. To facilitate cleaning of the filter 111, the cylindrical tank 11 may also be provided with a cleaning port 112.

[0066] The interior of the cylindrical tank 11 is divided into a raw liquid chamber S1 and several processing liquid chambers S2 by several partitions 113. The raw liquid chamber S1 is closest to the upstream end 11a, and the raw liquid chamber S1 and the several processing liquid chambers S2 are arranged from the upstream end 11a to the downstream end 11b. In this embodiment, the number of processing liquid chambers S2 can be four, but is not limited to this; for ease of explanation, the four processing liquid chambers S2 are arranged in the order from the upstream end 11a to the downstream end 11b (i.e., according to...). Figure 4 The directions shown (from left to right) are respectively referred to as the first processing liquid chamber S21, the second processing liquid chamber S22, the third processing liquid chamber S23, and the fourth processing liquid chamber S24. In other words, the first processing liquid chamber S21 is the processing liquid chamber S2 closest to the original liquid chamber S1, the second processing liquid chamber S22 is the second processing liquid chamber S2 counting from the upstream end 11a, the third processing liquid chamber S23 is the third processing liquid chamber S2 counting from the upstream end 11a, and the fourth processing liquid chamber S24 is the processing liquid chamber S2 closest to the downstream end 11b.

[0067] Please refer to Figure 3 , Figure 4 As shown, each of the partitions 113 can have an overflow hole 1131 at a relatively high position. Preferably, the overflow hole 1131 of the partition 113 closer to the downstream end 11b is positioned higher than the overflow hole 1131 of the partition 113 closer to the upstream end 11a. This allows the fluid level in the processing fluid chamber S2 closer to the downstream end 11b to be adjusted to the left if the fluid level is too high. Figure 3 The processing liquid chamber S2 (in the direction shown) overflows to prevent overloading of the space and industrial safety accidents, and more fluid can accumulate in the processing liquid chamber S2 further downstream 11b. Furthermore, the tank 11 may also be equipped with a sensor 114, which is electrically connected to a controller (not shown) and can be used to detect the liquid level in the raw liquid chamber S1.

[0068] The pipe module 14 has a connecting pipe 141, a feed pipe 142 connecting the connecting pipe 141 with the stock solution chamber S1, and the connecting pipe 141 has a switch valve 1411 for controlling the fluid from the input end of the connecting pipe 141 to flow to the output end of the connecting pipe 141 or to the feed pipe 142. The feed pipe 142 is provided with a switch valve 1421, and when the switch valve 1411 of the connecting pipe 141 is closed and the switch valve 1421 of the feed pipe 142 is opened, the fluid can be guided from the feed pipe 142, through the filter 111, and into the stock solution chamber S1. The pipe module 14 further has a discharge pipe 143 connecting the connecting pipe 141 with the first treatment liquid chamber S21, and the discharge pipe 143 can be provided with a switch valve 1431; thus, the fluid in the stock solution chamber S1 and other treatment liquid chambers S2 (the second treatment liquid chamber S22, the third treatment liquid chamber S23, and the fourth treatment liquid chamber S24) can be gradually overflowed to the first treatment liquid chamber S21 and flow into the connecting pipe 141 through the discharge pipe 143 for discharge, without overflowing to the stock solution chamber S1, and the switch valve 1431 can prevent the fluid in the connecting pipe 141 from flowing back into the first treatment liquid chamber S21.

[0069] The barrel 11 can also be provided with a manhole 115 on the barrel wall of the stock solution chamber S1 and the fourth treatment liquid chamber S24, respectively, for personnel to enter or view the internal space of the stock solution chamber S1 or the fourth treatment liquid chamber S24, and each manhole 115 can be closed by a manhole cover 116.

[0070] The plurality of cyclones 12 can each have at least one discharge port 121 and at least one backflow port 122, and the discharge ports 121 of the plurality of cyclones 12 are connected to the plurality of treatment liquid chambers S2, respectively, so that the fluid input into the cyclone 12 is separated by cyclone, and the fluid with relatively large specific gravity is thrown out and sinks by gravity to be input into the corresponding treatment liquid chamber S2 through the discharge port 121, and the fluid with relatively small specific gravity can be transported back into the barrel 11 through the backflow port 122 to the upstream end 11a for continuous separation work.

[0071] In the present embodiment, the plurality of cyclones 12 can be assembled in the barrel 11 and positioned above the corresponding treatment liquid chambers S2, respectively, so that the discharge port 121 can penetrate into the corresponding treatment liquid chamber S2 for accurate fluid input, and the backflow port 122 is exposed outside the barrel 11 for connection. That is, the pipe module 14 can have a plurality of backflow pipes 144, one end of each backflow pipe 144 can be connected to the backflow port 122 of each cyclone 12, and the other end can be connected to one of the treatment liquid chambers S2 or the stock solution chamber S1 towards the upstream end 11a.

[0072] For example, but not limited, the embodiment can select the number of cyclones 12 to be three; and likewise, for the purpose of illustration, the three cyclones 12 will be referred to as first cyclone 12a, second cyclone 12b and third cyclone 12c, respectively, in the order of arrangement from the upstream end 11a to the downstream end 11b (i.e. in the direction from left to right as shown in the figure). In other words, the first cyclone 12a is the cyclone 12 closest to the upstream end 11a, the second cyclone 12b is the second cyclone 12 from the upstream end 11a, and the third cyclone 12c is the cyclone 12 closest to the downstream end 11b. Figure 3

[0073] The discharge port 121 of the first cyclone 12a can be connected to the second treatment liquid chamber S22, and a three-way valve 1441 can be provided on the reflux pipe 144 connected to the reflux port 122 of the first cyclone 12a, so that by switching the three-way valve 1441, the reflux fluid can be controlled to flow into the raw liquid chamber S1 or the first treatment liquid chamber S21. In addition, the embodiment can select the number of discharge ports 121 and reflux ports 122 of the second cyclone 12b to be two, the two discharge ports 121 can be connected to the third treatment liquid chamber S23, and the diameters of the two discharge ports 121 of the second cyclone 12b can be smaller than the diameter of the discharge port 121 of the first cyclone 12a; one of the reflux ports 122 of the second cyclone 12b is connected to the raw liquid chamber S1 by a reflux pipe 144, and the other reflux port 122 is connected to the second treatment liquid chamber S22 by another reflux pipe 144. In addition, the discharge port 121 of the third cyclone 12c can be connected to the fourth treatment liquid chamber S24, and the diameter of the discharge port 121 of the third cyclone 12c can also be smaller than the diameter of the discharge port 121 of the first cyclone 12a; the reflux port 122 of the third cyclone 12c can be connected to the second treatment liquid chamber S22 by a reflux pipe 144.

[0074] The number of pressurizing pumps 13 can be at least equal to the number of cyclones 12; in the embodiment, the number of pressurizing pumps 13 can be four, and for the purpose of illustration, the four pressurizing pumps 13 will be referred to as first pressurizing pump 13a, second pressurizing pump 13b, third pressurizing pump 13c and fourth pressurizing pump 13d, respectively, in the order of arrangement from the upstream end 11a to the downstream end 11b (i.e. in the direction from left to right as shown in the figure). Figure 3

[0075] ​​The first pressurizing pump 13a can be connected to the raw liquid chamber S1 through a suction pipe 145 and to the first cyclone 12a through a delivery pipe 146 of the pipe module 14, so that the fluid in the raw liquid chamber S1 can be pumped to the first cyclone 12a for the first stage of cyclone separation by the operation of the first pressurizing pump 13a. Similarly, the second pressurizing pump 13b can be connected to the second treated liquid chamber S22 through another suction pipe 145 and to the second cyclone 12b through another delivery pipe 146, so that the fluid in the second treated liquid chamber S22 can be pumped to the second cyclone 12b for the second stage of cyclone separation by the operation of the second pressurizing pump 13b. The third pressurizing pump 13c can be connected to the third treated liquid chamber S23 through another suction pipe 145 and to the third cyclone 12c through another delivery pipe 146, so that the fluid in the third treated liquid chamber S23 can be pumped to the third cyclone 12c for the third stage of cyclone separation by the operation of the third pressurizing pump 13c. Preferably, a switch valve 1451 is arranged on the suction pipe 145 connected to the second pressurizing pump 13b and the third pressurizing pump 13c, so as to control the discharge of the fluid.

[0076] Since each of the partitions 113 is provided with the overflow hole 1131, when the first pressurizing pump 13a fails, the fluid in the raw liquid chamber S1 can overflow into the first treated liquid chamber S21 when the height of the accumulated fluid reaches the height of the overflow hole 1131. In addition, when the second pressurizing pump 13b or / and the third pressurizing pump 13c fails, the fluid that does not undergo the expected cyclone separation can not overflow to the downstream end 11b but can overflow to the upstream end 11a gradually, and finally overflow to the treated liquid chamber S2 (the first treated liquid chamber S21) closest to the raw liquid chamber S1 and flow into the connection pipe 141 through the discharge pipe 143, and will not overflow to the raw liquid chamber S1.

[0077] Preferably, the separation device 1 of the present embodiment can further comprise a stirrer 15, a solid-liquid separator 16 and a liquid collecting tank 17. The stirrer 15 can be assembled in the barrel 11 to stir the fluid in the fourth treatment liquid chamber S24 to homogenize it. The fourth pressurizing pump 13d can be connected to the fourth treatment liquid chamber S24 through a suction pipe 145 of the pipe module 14, which preferably has a switch valve 1451 to control the discharge. The fourth pressurizing pump 13d can also be connected to the solid-liquid separator 16 through a delivery pipe 146 of the pipe module 14, which can have a check valve 1461 to deliver the fluid in the fourth treatment liquid chamber S24 to the solid-liquid separator 16 for dewatering treatment by the operation of the fourth pressurizing pump 13d, so as to separate the solid and liquid. For example, but not limited to, the solid-liquid separator 16 can be a product of NORITAKE CO., LIMITED, which is commonly used in the market. The solid (e.g. soil) after the separation of the solid and liquid can be scraped by a scraper in the solid-liquid separator 16 and then dropped from the bottom. The solid-liquid separator 16 can also be connected to the liquid collecting tank 17 under normal pressure through a liquid delivery pipe 147 of the pipe module 14. The liquid collecting tank 17 can have a sensor 171 electrically connected to the controller (not shown in the figure) to detect the liquid level in the liquid collecting tank 17. The liquid collecting tank 17 can also be connected to the third treatment liquid chamber S23 through a backflow pipe 144 of the pipe module 14, which can have a switch valve 1442.

[0078] As shown in Figure 2 , the separation device 1 (in the dashed box) can be used in series with the aforementioned known mechanized device 9. That is, the upstream end 11a of the barrel 11 of the separation device 1 can be directed towards the oil tank 92 to be treated, and the downstream end 11b of the barrel 11 can be directed towards the temporary storage tank 93, and the input end of the connecting pipe 141 can be connected to the oil tank 92 to be treated through a second pipe 32, and the output end of the connecting pipe 141 can be connected to the temporary storage tank 93. The temporary storage tank 93 can be connected to the first pump 41 to extract air to maintain a negative pressure state, so that the output end of the connecting pipe 141 can deliver fluid to the temporary storage tank 93. The sludge in the oil tank 92 to be treated can be treated by the separation device 1 of the present embodiment to separate the solid material therefrom, and the clarified liquid material can flow into the temporary storage tank 93.

[0079] In detail, please refer to Figure 2 , Figure 4As shown, when the operation of cleaning the sludge in the oil tank 92 is started, the switch valve 1411 of the connecting pipe 141 is closed to make the sludge in the connecting pipe 141 flow to the feed pipe 142 instead of the output end of the connecting pipe 141, and the switch valves 1421, 1431, the first control valve 51, the fourth control valve 54, and the seventh control valve 57 are opened, and the ninth control valve 59 is closed, so that the light oil above the oil tank 91 can be pumped out by the third pump 43 as a flushing cleaning carrier, and flow through the first pipe 31, the fourth pipe 34b, the heater 21, and the fifth one-way valve 65, so that the flushing cleaning carrier can be heated to about 60°C, thereby being able to heat the sludge in the oil tank 92, reduce the viscosity of the sludge, and make the sludge easy to be taken out of the oil tank 92 by the flushing cleaning carrier. In the embodiment in which the flushing cleaning carrier does not need to be heated, the ninth control valve 59 is opened, so that the flushing cleaning carrier can flow through the delivery pipe 38 to directly input the oil tank 92, bypassing the heater 21.

[0080] After the sludge mixes with the flushing cleaning carrier to form a fluid (hereinafter referred to as a raw liquid) and is taken out of the oil tank 92, the raw liquid can flow into the input end of the connecting pipe 141, and then flow into the raw liquid chamber S1 of the cylinder tank 11 through the feed pipe 142 and the filter 111. Then, the first pressurizing pump 13a is used to pump the fluid in the raw liquid chamber S1, i.e., the raw liquid and the first-stage clarified liquid (to be described in the next paragraph), to the first cyclone 12a to perform the first-stage separation treatment. In this way, the fluid with a relatively large specific gravity in the first cyclone 12a can sink below the fluid with a relatively small specific gravity, and the fluid with a relatively large specific gravity (about 25% of the raw liquid, depending on the discharge port 121 of the first cyclone 12a) can flow into the second treatment liquid chamber S22 through the discharge port 121 of the first cyclone 12a.

[0081] On the other hand, the fluid with a relatively small specific gravity in the first cyclone 12a (about 75% of the raw liquid) is called a first-stage clarified liquid because it has been subjected to the separation treatment of the first cyclone 12a, has a specific gravity lower than that of the raw liquid, and has reduced impurities. The first-stage clarified liquid is discharged from the return pipe 144 connected to the first cyclone 12a to the three-way valve 1441. When the sensor 114 detects that the liquid level in the raw liquid chamber S1 is insufficient (the raw liquid is insufficient), the three-way valve 1441 can make the first-stage clarified liquid flow back to the raw liquid chamber S1 to serve as the flushing cleaning carrier for supplementing the raw liquid chamber S1. Conversely, when the sensor 114 detects that the liquid level in the raw liquid chamber S1 is high enough, the three-way valve 1441 can make the first-stage clarified liquid flow into the first treatment liquid chamber S21, and then flow into the connecting pipe 141 through the discharge pipe 143 to be discharged to the output end of the connecting pipe 141.

[0082] The fluid in the second treatment liquid chamber S22, which is the raw liquid having undergone the first stage separation but still containing some sludge, the replenished second stage clarified liquid (described in the fourth last paragraph of this section) and the replenished third stage clarified liquid (described in the next section), is pumped by the second pressurizing pump 13b to the second cyclone 12b for the second stage separation treatment. In the second cyclone 12b, the fluid with relatively large specific gravity sinks below the fluid with relatively small specific gravity, and the fluid with relatively large specific gravity (about 20% of the aforementioned mixed liquid) flows into the third treatment liquid chamber S23 through the two discharge ports 121 of the second cyclone 12b. The fluid with relatively small specific gravity (about 80% of the aforementioned mixed liquid) has undergone the separation treatment of the second cyclone 12b, and thus has a specific gravity lower than that of the first stage clarified liquid and the raw liquid and has reduced impurities, so it is called "second stage clarified liquid". A part of the second stage clarified liquid flows back into the second treatment liquid chamber S22 to serve as the flushing cleaning carrier for replenishing the second treatment liquid chamber S22, and another part of the second stage clarified liquid flows back into the raw liquid chamber S1 to serve as the flushing cleaning carrier for replenishing the raw liquid chamber S1.

[0083] The fluid in the third treatment liquid chamber S23, which is the raw liquid having undergone the first and second stage separations but still containing some sludge, the replenished fourth stage clarified liquid (described in the next section), is pumped by the third pressurizing pump 13c to the third cyclone 12c with a relatively small diameter for the third stage separation treatment. In the third cyclone 12c, the fluid with relatively large specific gravity sinks below the fluid with relatively small specific gravity, and the fluid with relatively large specific gravity (about 20% of the aforementioned mixed liquid, depending on the discharge port 121 of the third cyclone 12c, since the diameter of the discharge port 121 of the third cyclone 12c in this embodiment is equivalent to that of each of the discharge ports 121 of the second cyclone 12b) flows into the fourth treatment liquid chamber S24 through the discharge port 121 of the third cyclone 12c. The fluid with relatively small specific gravity (about 80% of the total mixed liquid having undergone the first to third stage separations) has undergone the separation treatment of the third cyclone 12c, and thus has a specific gravity lower than that of the first stage clarified liquid, the second stage clarified liquid and the raw liquid and has reduced impurities, so it is called "third stage clarified liquid". The third stage clarified liquid can also flow back into the second treatment liquid chamber S22 to serve as the flushing cleaning carrier for replenishing the second treatment liquid chamber S22.

[0084] The fourth pressurizing pump 13d is used to pump the fluid in the fourth treatment liquid chamber S24 to the solid-liquid separator 16 for the fourth stage separation treatment, so as to separate the solid and liquid; the separated solid (soil) can fall from the bottom of the solid-liquid separator 16, and the separated liquid is the aforementioned "fourth stage clarified liquid". The fourth stage clarified liquid is then transported to the liquid collecting tank 17 through the liquid transporting pipe 147; in normal state, the fourth stage clarified liquid in the liquid collecting tank 17 can be returned to the third treatment liquid chamber S23 through the connected return pipe 144, so as to be used as the replenishment of the third treatment liquid chamber S23. When the sensor 171 detects that the liquid level in the liquid collecting tank 17 is insufficient, the switch valve 1442 on the return pipe 144 is closed, so as to suspend the input of the fourth stage clarified liquid to the third treatment liquid chamber S23.

[0085] After the separation treatment of the above stages, the solid matter in the sludge in the oil tank 92 can be separated out and collected from the solid-liquid separator 16 or temporarily stored in the fourth treatment liquid chamber S24 (in the embodiment without the solid-liquid separator 16). The first to fourth stage clarified liquids can flow into the first treatment liquid chamber S21, and then flow to the output end of the connecting pipe 141 through the discharge pipe 143, so as to be input to the temporary storage tank 93. The clarified liquid in the temporary storage tank 93 is pumped out by the second pump 42, passes through the third pipe 33, the third one-way valve 63 and the detection valve T, and is then transported to the oil supply tank 91 for storage and refining treatment. The above process is repeated for several times, and the detection valve T in the third pipe 33 is used to check whether the sludge in the oil tank 92 is completely removed.

[0086] As described above, when the separation device in the present application is used for the cleaning operation without entering the oil tank, the solid matter in the sludge in the oil tank 92 can be separated out without being brought back to the oil supply tank 91, so that the sludge does not accumulate more and more. Since the separation device in the present application uses the clarified liquid with relatively small specific gravity and cleanliness as the replenishment of the flushing cleaning carrier after multi-stage separation, the pipe module 14 and the plurality of pressurizing pumps 13 will not be easily damaged or fail due to long-term circulation of the original liquid containing suspended impurities, and the construction period will not be affected and the quality control will not be poor due to the suspended impurities.

[0087] In addition, the above-mentioned treatment operation is carried out in the separation device in the present application, so that the treated objects will not be dispersed, the environment will not be polluted, and the operators and constructors will be safer. The separation device has simple structure, which can reduce the cost of the device, and has large treatment capacity and uninterrupted circulation treatment, which is very ideal.

[0088] Please refer to Figure 2As shown, the collecting tank 2 is used to receive the mixed liquid or clarified liquid from the temporary tank 93, the mixed liquid is formed by the washing carrier and the sludge in the oil tank 92, the clarified liquid is the clarified liquid which has been treated by the separation device 1, the mixed liquid or the clarified liquid can flow into the input end 2a of the collecting tank 2, and be outputted from the first output end 2b or the second output end 2c of the collecting tank 2 as the washing carrier, preferably, the collecting tank 2 can also have a heater 21, the heater 21 is used to heat the washing carrier, the heating is preferably about 60°C, so as to heat the sludge in the oil tank 92, so that it can be easily carried out by the washing carrier like water.

[0089] Please refer to Figure 2 As shown, the pipeline assembly 3 includes a first pipeline 31 which outputs the liquid inside the oil supply tank 91, a second pipeline 32 which connects the oil tank 92 and the input end of the connecting pipe 141 of the above-mentioned separation device 1, a feeding pipe 142 which is connected to one end between the input end of the connecting pipe 141 and the on-off valve 1411 of the connecting pipe 141, the other end of the feeding pipe 142 is connected to the raw liquid chamber S1 of the above-mentioned separation device 1, a third pipeline 33 which connects the outlet of the temporary tank 93 and the oil supply tank 91, a fourth pipeline 34 which connects the third pipeline 33 and the input end 2a of the collecting tank 2, wherein the fourth pipeline 34 is in second communication with the third pipeline 33 at the middle position, so that the fourth pipeline 34 between the two connection positions forms a front fourth pipeline 34a, and the second communication position and the collecting tank 2 form a rear fourth pipeline 34b, a fifth pipeline 35 which connects the first output end 2b of the collecting tank 2 to transport the fluid to the oil tank 92, one end of the fifth pipeline 35 is connected to the connecting pipe 141 between the on-off valve 1411 and the first one-way valve 61, and the other end is connected to the discharge pipe 143 of the first treatment liquid chamber S21, a sixth pipeline 36 which connects the second output end 2c of the collecting tank 2 and the third pipeline 33. In addition, the output end of the first pipeline 31 is connected to the rear fourth pipeline 34b, and is located between the fifth control valve 55 and the sixth control valve 56 (described later).

[0090] Please refer to Figure 2 As shown, preferably, the oil tank cleaning device of the present application can also have at least one pump which can be used to pump gas or liquid, so that the fluid in the pipeline assembly 3 can be pressurized or flow quickly, the pump can include a first pump 41 which is used to extract gas from the temporary tank 93, a second pump 42 in the front fourth pipeline 34a, a third pump 43 in the fifth pipeline 35, and a fourth pump 44 in the sixth pipeline 36.

[0091] Please refer to Figure 2As shown, the pipeline assembly 3 can further have at least one control valve for controlling the flow of liquid in each pipeline, including a first control valve 51 in the first pipeline 31, at least one second control valve 52 for controlling the discharge of liquid in the oil tank 92 to be treated, a switch valve 1411 in the connecting pipeline 141, a third control valve 53 in the third pipeline 33, a fourth control valve 54 in the front fourth pipeline 34a, a fifth control valve 55 and a sixth control valve 56 in the rear fourth pipeline 34b, a seventh control valve 57 in the fifth pipeline 35, a switch valve 1431 in the discharge pipeline 143, and an eighth control valve 58 in the sixth pipeline 36.

[0092] Please refer to Figure 2 As shown, preferably, the oil tank cleaning device of the present application can further have a supplementary device 7, which can be a storage tank for storing and supplying carriers such as water, diesel oil, cleaning liquid, or the supplementary device 7 can be a pipe for supplying carriers such as water, diesel oil, cleaning liquid. The pipeline assembly 3 can further include a seventh pipeline 37 connecting the first pipeline 31 and the supplementary device 7, an eighth pipeline 38 connecting the seventh pipeline 37 and the fifth pipeline 35, and a ninth control valve 59 and a tenth control valve 510 in the seventh pipeline 37. Please note that one end of the first pipeline 31 is connected to the oil supply tank 91, the other end of the first pipeline 31 is connected to the rear fourth pipeline 34b, one end of the eighth pipeline 38 is connected between the seventh control valve 57 and the fifth pipeline 35, and the other end of the eighth pipeline 38 is connected between the ninth control valve 59 and the tenth control valve 510 in the seventh pipeline 37.

[0093] Please refer to Figure 2 As shown, the pipeline assembly 3 can further have at least one one-way valve for controlling the one-way flow of liquid in each pipeline, including a first one-way valve 61 in the connecting pipeline 141 adjacent to the temporary storage tank 93, a second one-way valve 62 and a third one-way valve 63 in the third pipeline 33, a fourth one-way valve 64 in the fourth pipeline 34, a fifth one-way valve 65 in the fifth pipeline 35, and a sixth one-way valve 66 in the sixth pipeline 36.

[0094] The oil tank 92 to be treated is a well-known oil tank which can be of various shapes. In the present embodiment, the oil tank 92 to be treated can be, for example, a well-known cylindrical oil tank. Since the oil tank 92 to be treated has a large volume, the oil tank 92 to be treated has four second control valves 52, and the four second control valves 52 are arranged around the periphery of the oil tank 92 to be treated. The oil tank 92 to be treated can be subjected to zoned flushing, so that the mixture after being flushed can be carried out from the adjacent second control valves 52. The following examples of cleaning methods will be described, but the cleaning methods are not limited to these examples.

[0095] Please refer to Figure 5 When the oil tank 92 to be treated stores light oil, the light oil in the oil tank 92 to be treated can be used as a flushing cleaning carrier, so that the light oil and the sludge in the oil tank 92 to be treated can be mixed into a homogeneous mixture. Since the temporary storage tank 93 can be emptied of air by the first pump 41 to maintain a negative pressure state, the light oil can flow out of the second control valve 52 due to the opening of the second control valve 52, and enter the temporary storage tank 93 through the second control valve 52, the second pipeline 32, the on-off valve 1411, the connecting pipe 141, and the first one-way valve 61. Due to the suction of the third pump 43, the light oil will not enter the oil supply tank 91, but will enter the collection tank 2 through the third pipeline 33, the third control valve 53, the fifth control valve 55 of the fourth pipeline 34b, and the sixth control valve 56 of the input end 2a. If necessary, the heater 21 can be turned on to heat the flushing cleaning carrier to about 60°C, so that the sludge in the oil tank 92 to be treated can be easily carried out by the flushing cleaning carrier like water. The flushing cleaning carrier is then output from the first output end 2b of the collection tank 2 along the fifth pipeline 35 through the seventh control valve 57, the third pump 43, and the fifth one-way valve 65, and is sprayed into the oil tank 92 to be treated from the spray head at the top of the oil tank 92 to be treated, so as to strongly flush the sludge in the oil tank 92 to be treated. In this way, the light oil and the sludge in the oil tank 92 to be treated can be homogenized by heating and flushing. When the sensor 931 detects that there is no liquid in the temporary storage tank 93, a controller (not shown in the figure) is actuated to stop the entire oil tank cleaning device.

[0096] Please refer to Figure 6When the cleaning agent carrier does not need to be heated by the heater 21 or the collecting tank 2 is out of order, the sixth control valve 56 and the seventh control valve 57 can be closed, so that the mixture entering the rear fourth pipeline 34b can be diverted by the seventh pipeline 37 through the ninth control valve 59, the eighth pipeline 38, and then enter the fifth pipeline 35. By the suction and pressurization of the third pump 43, the mixture can pass through the fifth one-way valve 65, and be sprayed from the nozzle at the output end of the fifth pipeline 35 to strongly flush the sludge inside the oil tank 92.

[0097] Please refer to Figure 7 When the oil tank 92 stores light oil, the light oil in the oil tank 92 can be used as a cleaning agent carrier to remove the sludge accumulated above the second control valve 52 in the oil tank 92. The sludge mixture flushed out by the light oil can be subjected to multi-stage cyclic separation treatment in the separation device 1 (in the dashed box). That is, the sludge mixture is carried out from the adjacent second control valve 52 and enters the second pipeline 32, and the switch valve 1411 is closed, so that the sludge mixture can enter the separation device 1 through the feed pipe 142, the switch valve 1421, and be subjected to multi-stage cyclic separation treatment. After the cyclonic separation treatment, the separated solid can fall from the bottom; the separated clear liquid enters the temporary storage tank 93 through the discharge pipe 143, the switch valve 1431, the connecting pipe 141, and the first one-way valve 61. Due to the closing of the fourth control valve 54 and the second pump 42 and the non-return action of the fourth one-way valve 64, and due to the suction action of the third pump 43, the clear liquid is strongly sprayed from the nozzle at the output end of the fifth pipeline 35 through the third pipeline 33, the third control valve 53, the rear fourth pipeline 34b, the fifth control valve 55, the sixth control valve 56, the collecting tank 2, the seventh control valve 57, and the fifth one-way valve 65, to flush the sludge above the second control valve 52 in the oil tank 92.

[0098] Please refer to Figure 8As shown, the clarified liquid after multi-stage cyclic separation treatment via the separation device 1 can be recovered. That is, the oil sludge mixture is carried out from the adjacent second control valve 52 and into the second pipeline 32, and the on-off valve 1411, the third control valve 53 and the fifth control valve 55 are closed, so that the clarified liquid enters into the separation device 1 for separation treatment via the connecting pipe 141, the on-off valve 1421 and the feed pipe 142, and after cyclonic separation treatment, the separated solid falls from the bottom thereof; the separated clarified liquid enters into the temporary storage tank 93 via the discharge pipe 143, the on-off valve 1431, the connecting pipe 141 and the first one-way valve 61, and due to the suction of the second pump 42, enters into the oil supply tank 91 via the front fourth pipeline 34a, the fourth control valve 54, the second pump 42, the fourth one-way valve 64, the second one-way valve 62, a detection valve T for detecting the clarified liquid and the third one-way valve 63. In this way, the treated clarified liquid can be recovered to meet the environmental protection concept and increase the profit.

[0099] Please refer to Figure 9 As shown, when the oil tank to be treated 92 is an oil tank for storing fuel oil, light oil at the upper end inside the oil supply tank 91 can be used as a flushing cleaning agent to flush the oil sludge in the oil tank to be treated 92, and the light oil enters into the collection tank 2 via the first pipeline 31, the first control valve 51 and the rear fourth pipeline 34b, and due to the closing of the fifth control valve 55 and the ninth control valve 59, the light oil enters into the collection tank 2 via the sixth control valve 56, and if necessary, the heater 21 can be turned on to heat the fluid, which is then output from the fifth pipeline 35 via the fifth one-way valve 65 by the pressurization of the third pump 43, and is strongly sprayed from the nozzle at the output end of the fifth pipeline 35, so as to flush the oil sludge in the oil tank to be treated 92 and use the light oil as a carrier to carry out the oil sludge mixture, which is then carried out from the adjacent second control valve 52 and into the second pipeline 32, and due to the closing of the on-off valve 1411, the oil sludge mixture enters into the separation device 1 for multi-stage cyclic separation treatment via the feed pipe 142 and the on-off valve 1421, and after cyclonic separation treatment, the separated solid falls from the bottom thereof; the separated clarified liquid enters into the temporary storage tank 93 via the discharge pipe 143, the on-off valve 1431, the connecting pipe 141 and the first one-way valve 61, and due to the suction and pressurization of the second pump 42, enters into the oil supply tank 91 via the front fourth pipeline 34a, the fourth control valve 54, the second pump 42, the fourth one-way valve 64, the second one-way valve 62 and the detection valve T.

[0100] When the oil tank 92 to be treated is an oil tank for storing crude oil, because the sludge in the oil tank for storing crude oil has strong viscosity and poor flowability, the sludge cleaning operation above the second control valve 52 must be carried out in three steps. The first step is to supplement light oil (for example, diesel oil) into the oil tank 92 to be treated. The second step is to make the sludge in the oil tank 92 to be treated be dissolved, infiltrated and heated to mix with the diesel oil to become homogeneous and to become a mixture with good flowability. The third step is to make the mixture enter the separation device 1 for multi-stage cyclic separation treatment.

[0101] As shown in Figure 10 , first, the first step is described. The diesel oil can be supplied as a carrier by the supplement device 7. Before the operation of the first step is carried out, the second control valve 52 is closed. Due to the suction of the third pump 43, the diesel oil can be injected into the oil tank 92 to be treated by the nozzle at the output end of the fifth pipeline 35 through the seventh pipeline 37, the tenth control valve 510, the eighth pipeline 38, the third pump 43 and the fifth one-way valve 65. When the amount of diesel oil supplemented in the oil tank 92 to be treated is sufficient, the tenth control valve 510 is closed.

[0102] As shown in Figure 5 , the operation of the second step is carried out. The temporary storage tank 93 can be emptied of air by the first pump 41 to maintain a negative pressure state, so that the diesel oil mixture in the oil tank 92 to be treated can be carried out from the opened second control valve 52 and enter the connecting pipeline 141, the on-off valve 1411 and the first one-way valve 61 into the temporary storage tank 93. Due to the suction of the third pump 43, the diesel oil mixture enters the collection tank 2 through the third pipeline 33, the third control valve 53, the rear fourth pipeline 34b, the fifth control valve 55 and the sixth control valve 56. Due to the opening of the heater 21, the temperature of the diesel oil mixture can be heated to about 60°C to become a fluid with good flowability. The hot and flowable flushing cleaning carrier is recycled through the fifth pipeline 35 and the seventh control valve 57. By the pressurization of the third pump 43 and through the fifth one-way valve 65, the nozzle at the output end of the fifth pipeline 35 sprays inward from the top of the oil tank 92 to be treated to repeatedly heat and dissolve the sludge in the oil tank 92 to be treated.

[0103] When the sludge in the oil tank 92 to be treated for storing crude oil is repeatedly heated and dissolved as described above, the operation of the third step is carried out. As shown in Figure 7 , the sludge mixture can enter the separation device 1 through the feed pipeline 142 and the on-off valve 1421 for multi-stage cyclic separation treatment. As shown in Figure 8 , the clarified liquid after multi-stage cyclic separation treatment by the separation device 1 is recovered to meet the environmental protection concept and increase the income.

[0104] Referring to Figure 10 As the second control valve 52 of the oil tank 92 still has a distance from the bottom of the oil tank, the above-mentioned cleaning methods cannot clean and remove the sludge accumulated below the second control valve 52. The oil tank cleaning device of the present application can also use the supplementary device 7 to supply water as a carrier. Due to the suction of the third pump 43, the water carrier can be injected into the oil tank 92 through the seventh pipeline 37, the tenth control valve 510, the eighth pipeline 38, the third pump 43, the fifth one-way valve 65, and the nozzle at the output end of the fifth pipeline 35, so that the sludge below the second control valve 52 and the inner wall of the oil tank 92 are dissolved and washed from top to bottom in the order of oil layer, water layer, and sand layer.

[0105] Referring to Figure 5 As shown in FIG. 7, when the oil tank 92 is injected with an appropriate amount of water, the tenth control valve 510 is immediately closed, and the oil-water mixture enters the connecting pipe 141 through the second control valve 52, the switch valve 1411, and the first one-way valve 61, and then enters the temporary tank 93. Due to the suction of the third pump 43, the oil-water mixture is further injected into the collection tank 2 through the third pipeline 33, the third control valve 53, the fifth control valve 55 of the fourth pipeline 34b, and the sixth control valve 56. The heater 21 is turned on to heat the oil-water mixture, so that the heated oil-water mixture is injected again into the oil tank 92 through the nozzle at the output end of the fifth pipeline 35, the seventh control valve 57, the third pump 43, and the fifth one-way valve 65, so as to repeatedly perform the homogenization of the oil layer, water layer, and sand layer in the oil tank 92 due to heating and dissolution.

[0106] Referring to Figure 7As shown, since the oil layer is lighter than the water layer, the oil layer will float on the water layer, and when the bottom of the oil layer is higher than the top of each second control valve 52 of the oil tank 92 to be treated, the separation of oil, water and sand can be performed by the separation device 1. The switch valve 1411 can be closed, and the oil, water and sand mixture is discharged and enters the separation device 1 through the feed pipe 142, the feed pipe 142, the switch valve 1421 for multi-stage cyclic separation treatment. After the cyclone separation treatment, the separated solid falls from the bottom; the clarified liquid (oil) enters the temporary storage tank 93 through the discharge pipe 143, the switch valve 1431, the connecting pipe 141, the first one-way valve 61, and then enters the third pipeline 33, the third control valve 53, the fourth pipeline 34b, the fifth control valve 55, the sixth control valve 56, and then the heater 21 for heating the clarified liquid. The heated clarified liquid is recirculated through the fifth pipeline 35, passes through the seventh control valve 57, is sucked and pressurized by the third pump 43, and is injected again into the oil tank 92 to be treated through the nozzle at the output end of the fifth pipeline 35, so as to repeatedly perform the flushing and discharge of the oil sludge in the oil tank 92 to be treated.

[0107] Please refer to Figure 11 As shown, when the oil layer above the second control valve 52 has been completely removed, the seventh control valve 57 can be closed and the eighth control valve 58 can be opened to change the flow direction of the clarified liquid. That is, the first pump 41 is used to suck air from the temporary storage tank 93 to maintain a negative pressure state. After the clarified liquid enters the temporary storage tank 93, it enters the collection tank 2 through the third pipeline 33, the third control valve 53, the fourth pipeline 34b, the fifth control valve 55 and the sixth control valve 56 for oil-water separation. After the oil-water separation, the clarified liquid is recovered and reused by entering the oil supply tank 91 through the sixth pipeline 36, the eighth control valve 58, being sucked and pressurized by the fourth pump 44, passing through the sixth one-way valve 66, and then entering the oil supply tank 91 through the third pipeline 33 and the detection valve T and the third one-way valve 63.

[0108] In summary, the oil tank cleaning device of the present application can perform cleaning operations without personnel entering the oil tank, can avoid accidents, and can use the arrangement of the pipeline to circulate and repeatedly clean the oil tank to be treated, so as to effectively remove the oil sludge in the oil tank. After the oil sludge is separated, the clarified liquid can be recovered, which can meet the environmental protection concept and avoid waste of oil resources to increase the profit effect.

[0109] Although the present application has been disclosed with reference to the preferred embodiments thereof, it is not intended to limit the application but rather to explain the application to one of ordinary skill in the art. Various modifications and alterations of the described embodiments will become apparent to the skilled artisan in the art and are intended to be encompassed by the scope of the application. The scope of the application is to be limited only by the claims appended hereto.

Claims

1. An oil tank cleaning device, characterized in that, The separation device comprises a tank having an upstream end and a downstream end, the interior of the tank being partitioned by partitions into a raw liquid chamber and a plurality of treated liquid chambers arranged from the upstream end to the downstream end; a plurality of cyclones, each having at least one discharge port and at least one return port, the discharge ports of the cyclones being respectively connected to the treated liquid chambers; and a pipeline module connected to the tank, the cyclones and a plurality of pressure pumps, so that the fluid in the tank is pumped by the pressure pump closest to the upstream end to the corresponding cyclone, the fluid with relatively high specific gravity is input to the corresponding treated liquid chamber through the discharge port of the cyclone, and then pumped by the next pressure pump to the next cyclone, so that the fluid with relatively high specific gravity is sequentially transported to the downstream end, and the fluid with relatively low specific gravity is transported back to the tank through the return port of the cyclone to continue circulation. The temporary storage tank is pumped by a first pump to remove air from the temporary storage tank, so that the temporary storage tank is in a negative pressure state. A collection tank is used to receive the fluid output from the temporary storage tank. A pipeline assembly has a plurality of pipelines connected to an oil supply tank, an oil to be treated tank, the temporary storage tank, the separation device and the collection tank. Each pipeline has at least one control valve to control the flow of liquid in the pipeline. The collection tank further comprises a heater for heating the fluid passing through the collection tank.

2. The oil sump cleaning device of claim 1, wherein, The heating temperature is 60°C.

3. The oil sump cleaning device of claim 2, wherein, The pipeline assembly comprises a first pipeline for outputting the liquid in the oil supply tank, a second pipeline connected to the input end of the connecting pipe of the separation device, a feed pipe connected between the input end of the connecting pipe and the on-off valve of the connecting pipe, the other end of the feed pipe being connected to the raw liquid chamber of the separation device, a third pipeline connected to the outlet of the temporary storage tank and the oil supply tank, a fourth pipeline connected to the third pipeline and an input end of the collection tank, wherein the fourth pipeline is connected to the third pipeline again at a middle position, so that the fourth pipeline between the two connection positions forms a front fourth pipeline, and the fourth pipeline between the second connection position and the collection tank forms a rear fourth pipeline, a fifth pipeline connected to a first output end of the collection tank to transport the fluid to the oil to be treated tank, a discharge pipe connected between the on-off valve and the first one-way valve of the connecting pipe, and connected to the first treated liquid chamber of the plurality of treated liquid chambers, and a sixth pipeline connected to a second output end of the collection tank and the third pipeline.

4. The oil sump cleaning device of claim 1, wherein, The pipeline assembly further comprises a plurality of pumps, including a second pump in the front fourth pipeline, a third pump in the fifth pipeline, and a fourth pump in the sixth pipeline.

5. The oil sump cleaning device of claim 4, wherein, ​ 6. The oil sump cleaning device of claim 5, wherein, The control valve includes a first control valve of the first pipeline, at least a second control valve for controlling the liquid discharge in the oil tank to be treated, a switch valve of the connecting pipe, a third control valve of the third pipeline, a fourth control valve of the front fourth pipeline, a fifth control valve and a sixth control valve of the rear fourth pipeline, a seventh control valve of the fifth pipeline, a switch valve of the discharge pipe, and an eighth control valve of the sixth pipeline.

7. The oil sump cleaning device of claim 6, wherein The output end of the first pipeline is connected to the rear fourth pipeline and located between the fifth control valve and the sixth control valve.

8. The oil sump cleaning device of claim 6, wherein, A supplementary device is further included, and the pipeline assembly further includes a seventh pipeline connecting the first pipeline and the supplementary device, and an eighth pipeline connecting the seventh pipeline and the fifth pipeline.

9. The oil sump cleaning device of claim 8, wherein, The seventh pipeline has a ninth control valve and a tenth control valve.

10. The oil sump cleaning device of claim 9, wherein, One end of the eighth pipeline is connected to the fifth pipeline between the seventh control valve and the third pump, and the other end of the eighth pipeline is connected to the seventh pipeline between the ninth control valve and the tenth control valve.

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