Acidic water non-powered oil and impurity removal device and method thereof

Abstract

The utility model relates to oil chemical industry technical field, and a device and method for removing oil and impurities from acidic water without power, including separator and filter, the separator is connected with filter through pipeline, the separator is connected with acid sewage tank, light dirty oil collection tank and acid water tank through pipeline respectively on, the filter is equipped with pure water injection line and nitrogen injection line, the filter is equipped with filter bag in, the filter bag below is equipped with steam coil, the filter bottom is connected with acid water tank through pipeline, the filter top is connected with acid water tank through pipeline, the device works in the whole process using the pressure of external acid water input to work, does not use other power device, does not consume electric energy, has greater advantage in energy saving and consumption reduction, and compared with other processing devices, the sludge produced by the device is dry sludge, can be directly packed and handled, greatly reduces the processing difficulty and processing cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of petroleum chemical industry, in particular to a device and method for removing oil and impurities from acidic water without power. BACKGROUND

[0002] In a petroleum chemical enterprise, acidic water is a kind of acidic sewage commonly existing in various devices. Since the sewage is produced in multiple processes of the oil refining process, it is inevitable that part of light contaminated oil and solid impurities are mixed therein. The solid impurities and light contaminated oil will have a serious impact on the subsequent acidic water stripping treatment. After entering the stripping tower and heat exchanger related equipment, the solid impurities and light contaminated oil will affect the stripping effect, cause the purified water produced to be unqualified, form sludge after accumulation in the equipment, block the tray, reduce the heat exchange efficiency of the heat exchanger, and accelerate the corrosion of the equipment to some extent. Therefore, the light contaminated oil and solid impurities in the acidic water need to be removed in advance.

[0003] The devices and equipment for such use in the market have complex processes and large investment, and some need to consume electric energy by means of power mechanism to remove impurities, which has large energy consumption. At the same time, a considerable amount of wastewater is generally generated in the treatment process of these devices and equipment, and the separated solid impurities and light contaminated oil are mixed together, which has large treatment difficulty and high disposal cost as hazardous waste. SUMMARY

[0004] In view of the above problems of the prior art, the present application aims to provide a device and method for removing oil and impurities from acidic water without power, which can solve the above technical problems.

[0005] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] A device for removing oil and impurities from acidic water without power comprises a separator and a filter, the separator is connected with the filter through a pipeline, the separator is connected with an acidic sewage tank, a light contaminated oil collection tank and an acidic water tank through pipelines respectively, the pipeline connected with the separator of the acidic sewage tank is laterally cut into the separator and makes the acidic sewage in the acidic sewage tank form a vortex in the interior of the separator, and the pipelines connected with the separator of the light contaminated oil collection tank and the acidic water tank are arranged at the top of the separator; the filter is provided with a pure water injection line and a nitrogen injection line, a filter bag is arranged in the interior of the filter, the bottom of the filter is connected with the acidic water tank through a pipeline, and the top of the filter is connected with the acidic water tank through a pipeline.

[0007] Preferably, the pipeline connected with the separator of the acidic water tank extends to the middle part of the separator.

[0008] Preferably, the number of the filters is two, and the two filters are arranged side by side at the bottom of the separator.

[0009] Preferably, a steam coil is arranged below the filter bag, and a steam injection pipeline and a condensate outlet pipeline are connected to the steam coil, both extending to outside of the filter.

[0010] Preferably, the top of the separator is connected to the bottom of the sour water tank through a pipeline, the bottom of the filter is connected to the top of the separator through a pipeline, and the pipeline of the filter is communicated with the pipeline of the sour water tank.

[0011] Preferably, differential pressure monitoring instruments are arranged on the inlet pipeline and the outlet pipeline of the filter.

[0012] A method for removing oil and impurities from sour water without power, comprising the following steps:

[0013] S1: The sour water delivered by the sour water tank is first introduced into the separator. When the equipment is first put into use, the top oil discharge valve is opened to discharge air into the light oil collection tank, so that the liquid fills the entire separator;

[0014] S2: The sour water enters along the transverse line of the equipment, and a rotating flow state is formed in the separator. During the flow process, solid impurities move to the inner wall of the separator due to centrifugal force, and move to the bottom of the separator along the inner wall of the separator. Light oil moves to the top of the separator due to its lower specific gravity. After a period of operation, the top oil discharge valve is opened, and the light oil collected at the top is discharged to the light oil collection tank under the internal pressure of the equipment, and then sent out together with other oil;

[0015] S3: The separated solid impurities enter the filter along with a small amount of sour water from the pipeline at the bottom of the separator to filter the solid impurities;

[0016] S4: The sour water separated by the separator is delivered by the pipeline extending to the middle position of the separator, and is combined with the filtered sour water at the bottom of the filter to be sent out to the sour water tank;

[0017] S5: When the pressure difference of one filter is large, the valve for introducing sour water into the filter is closed, and the valve for introducing sour water into another filter is opened, so that another filter is put into use;

[0018] S6: The pure water injection line of the filter is opened to replace the sour water in the filter;

[0019] S7: After the replacement is completed, the nitrogen valve is opened, the pure water valve is closed, the liquid in the filter is completely pressed out, and then the outlet valve of the filter is closed;

[0020] S8: The steam inlet valve and the condensate outlet valve of the steam coil are opened to heat the filter;

[0021] S9: open the filter top gas exhaust valve, slightly open the nitrogen valve, maintain the pressure in the filter, and continue the drying process for 4-5 hours after the temperature rises;

[0022] S10: after the drying process is completed, close the steam coil, and use nitrogen to cool the filter;

[0023] S11: after the temperature drops, close the nitrogen, and after the pressure in the filter is balanced with the pressure in the acidic water tank, close the filter top gas exhaust valve;

[0024] S12: disassemble the filter top cover, remove the filter bag, pack the dry sludge impurities in the filter bag, then clean the filter bag, and reassemble the cleaned filter bag into the filter, and cover the filter top cover;

[0025] S13: if the other filter needs to be cleaned due to a large pressure difference before and after, repeat steps S5-S12.

[0026] Preferably, the heating temperature of the steam coil is 80-100℃.

[0027] Compared with the prior art, the beneficial effects of the present application are:

[0028] 1、Compared with the prior art, the present application needs multiple sets of equipment to cooperate with the treatment of impurities and light dirty oil, and the separator of the present application has the functions of removing light dirty oil and solid impurities in acidic water, has small equipment occupation area, and is simple to operate.

[0029] 2、During the operation of the present application, the pressure of the input external acidic water is used throughout the process, no other power devices are used, no electric energy is consumed, and the present application has great advantages in energy saving and consumption reduction.

[0030] 3、During the entire operation process of the present application, a small amount of harmful gas directly enters the acidic water tank, no new sewage is discharged, no additional treatment difficulty is generated, and the present application has great advantages in environmental protection.

[0031] 4、For enterprises, wet sludge containing water is much more difficult to treat than dry sludge, and the treatment cost of wet sludge is much higher than that of dry sludge, and compared with other treatment devices, the sludge produced by the present application is dry sludge, which can be directly packed and treated, greatly reducing the treatment difficulty and treatment cost. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0033] Figure 1 The structural schematic diagram of the present application.

[0034] Explanation of reference signs:

[0035] 1-separator, 2-filter, 3-acidic sewage tank, 4-light contaminated oil collection tank, 5-acidic water tank, 6-pure water injection line, 7-nitrogen injection line, 8-filtering bag, 9-differential pressure monitoring instrument, 10-steam coil, 11-steam injection pipeline, 12-condensate water outlet pipeline. DETAILED DESCRIPTION

[0036] The present application will be described in detail below with reference to the accompanying drawings, which are presented herein by way of example and are not limitative of the present application.

[0037] As Figure 1 shown, the present application provides a kind of acidic water unpowered oil removal and impurity removal device, including separator 1 and filter 2, the separator 1 is connected with filter 2 by pipeline;The separator 1 is connected with acidic sewage tank 3, light contaminated oil collection tank 4 and acidic water tank 5 respectively by pipeline, the pipeline of the acidic sewage tank 3 connected with separator 1 is laterally cut into separator 1 and makes the acidic sewage in acidic sewage tank 3 into the inside of separator 1 and forms vortex, the pipeline of light contaminated oil collection tank 4 and acidic water tank 5 connected with separator 1 are all arranged at the top of separator 1;In the present application, separator 1 is the core part of separating contaminated oil, solid impurities and water, foreign acidic water enters the inside of equipment along the direction of equipment transverse line, forms rotating flow in the inside of equipment, using the action of centrifugal force and gravity, solid impurities with greater density move to the inner wall of separator 1 in the process of liquid rotating flow, then converge to the bottom of separator 1 along the inner wall of separator 1, and enter the lower filter 2 for filtering and removing with bottom water flow;Light contaminated oil is lighter, moves to the top of separator 1 in the process of flow, is discharged to light contaminated oil collection tank 4 by the oil discharge pipeline of the top of separator 1 using the pressure of separator 1 itself.

[0038] Further, in the present embodiment, the pipeline of acidic water tank 5 connected with separator 1 extends to the middle part of separator 1, to ensure that the separated upper contaminated oil and lower solid impurities do not mix into acidic water again.

[0039] The number of filter 2 is two, and the two filters 2 are arranged side by side at the bottom of separator 1, one standby and one in use, so that another filter 2 can run when cleaning one filter 2, without affecting normal production operation.

[0040] Further, in the embodiment, the filter 2 is provided with a pure water injection line 6 and a nitrogen injection line 7, and is internally provided with a filter bag 8, and the bottom of the filter 2 is connected with the acid water tank 5 through a pipeline, and the top of the filter 2 is connected with the acid water tank 5 through a pipeline.

[0041] Further, in the embodiment, the filter bag 8 is provided below with a steam coil 10, and the steam coil 10 is connected with a steam injection pipeline 11 and a condensate water outlet pipeline 12, and the steam injection pipeline 11 and the condensate water outlet pipeline 12 both extend to the outside of the filter 2.

[0042] Further, in the embodiment, the top of the separator 1 is connected with the bottom of the acid water tank 5 through a pipeline, the bottom of the filter 2 is connected with the top of the separator 1 through a pipeline, and the pipeline of the acid water tank 5 is in communication.

[0043] The filter 2 in the application adopts a whole pocket type filter screen design, and is provided with a pure water injection line 6 and a nitrogen injection line 7, and is internally provided with a steam coil 10, and the top of the filter 2 is provided with a gas discharge pipeline, and the acid water outlet is at the bottom of the filter 2. The acid water outlet at the bottom of the filter 2 after the bottom filtration is combined with the acid water outlet of the separator 1 and then enters the acid water tank 5 through the bottom of the acid water tank 5; the pure water injection line 6 is used to clean the solid impurities in the filter 2 before the filter 2 is disassembled and cleaned, so as to reduce the harmful substance residue and reduce the odor; the nitrogen injection line 7 is used to increase the pressure in the filter 2 after cleaning, so as to press all the liquid in the filter 2 out of the equipment; the steam coil 10 is used to raise the temperature in the filter 2 after the liquid in the filter 2 is pressed out, dry the solid impurities in the filter 2, and produce dry mud-like substances; the steam generated by heating is discharged to the top of the acid water tank 5 through the gas discharge pipeline at the top of the filter 2, so as to avoid environmental pollution. The pocket type filter bag 8 is disassembled and cleaned, and the dry sludge is collected, the filter bag 8 can be reused after being cleaned, and the top cover of the filter 2 adopts a convenient opening and closing design.

[0044] Further, in the embodiment, the inlet pipeline and the outlet pipeline of the filter 2 are both provided with a differential pressure monitoring instrument 9, and the differential pressure monitoring instrument 9 is arranged before and after the filter 2, so as to judge the impurity accumulation in the filter 2 and determine whether to clean.

[0045] An acid water non-powered oil removal and impurity removal method, comprising the following steps:

[0046] S1: The acid sewage tank 3 delivers the acid sewage to the separator 1 first, and when the equipment is first put into use, the top oil discharge valve needs to be opened to discharge gas to the light oil collection tank 4, so that the liquid fills the entire separator 1;

[0047] S2: The acid sewage enters along the equipment transverse line, forms a rotating flow state in the separator 1, and during the flow, the solid impurities move to the inner wall of the separator 1 due to the centrifugal force, gather along the inner wall of the separator 1 to the bottom of the separator 1, and the light contaminated oil moves to the top of the separator 1 due to the lighter specific gravity. After a period of operation, the top oil outlet valve is opened, the light contaminated oil collected at the top is discharged to the light contaminated oil collecting tank 4 by using the internal pressure of the equipment, and then is sent out together with other contaminated oil;

[0048] S3: The separated solid impurities enter the filter 2 from the bottom pipeline of the separator 1 along with a small part of the acid sewage to filter the solid impurities;

[0049] S4: The acid sewage separated by the separator 1 is transported by the pipeline extending to the middle position in the separator 1, is combined with the filtered acid sewage at the bottom of the filter 2, and is sent out to the acid sewage tank 5;

[0050] S5: When the pressure difference of one filter 2 is large, the valve for the acid sewage entering this filter 2 is closed, the valve for the acid sewage entering another filter 2 is opened, and another filter 2 is put into use;

[0051] S6: The pure water injection line 6 on the filter 2 is opened to replace the acid sewage in the filter 2;

[0052] S7: After the replacement is completed, the nitrogen valve is opened, the pure water valve is closed, the liquid in the filter 2 is completely pressed out, and then the outlet valve of the filter 2 is closed;

[0053] S8: The steam inlet valve and the condensate outlet valve of the steam coil 10 are opened to heat the filter 2;

[0054] S9: The gas discharge valve at the top of the filter 2 is opened, the nitrogen valve is slightly opened to maintain the pressure in the filter 2, and after the temperature rises, the drying process is continuously carried out for 5 hours;

[0055] S10: After the drying process is completed, the steam coil 10 is closed, and the filter 2 is cooled by using nitrogen blowing;

[0056] S11: After the temperature drops, the nitrogen is closed, the pressure in the filter 2 is lowered to balance with the pressure in the acid sewage tank 5, and then the gas discharge valve at the top of the filter 2 is closed;

[0057] S12: The top cover of the filter 2 is removed, the filter bag 8 is taken out, the dry sludge impurities in the filter bag 8 are packed, the filter bag 8 is cleaned, the cleaned filter bag 8 is reinstalled into the filter 2, and the top cover of the filter 2 is closed;

[0058] S13: If another filter 2 needs to be cleaned due to a large pressure difference before and after, the steps S5-S12 are repeated.

[0059] Further, in the present embodiment, the heating temperature of the steam coil 10 is 100°C.

[0060] The above merely provides the preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any person skilled in the art, within the technical range disclosed by the present application, according to the technical solution and the application concept of the present application, makes equivalent replacement or change, should be covered within the protection scope of the present application.

Claims

1. A non-powered oil and impurity removal device for acidic water, comprising a separator (1) and a filter (2), wherein the separator (1) is connected to the filter (2) via a pipeline, characterized in that, The separator (1) is connected to an acidic wastewater tank (3), a light oil collection tank (4), and an acidic water tank (5) via pipelines. The pipeline connecting the acidic wastewater tank (3) to the separator (1) is laterally cut into the separator (1), causing the acidic wastewater in the acidic wastewater tank (3) to enter the separator (1) and form a vortex. The pipelines connecting the light oil collection tank (4) and the acidic water tank (5) to the separator (1) are both located at the top of the separator (1). The filter (2) is equipped with a pure water injection line (6) and a nitrogen injection line (7). The filter (2) is equipped with a filter bag (8) inside. The bottom of the filter (2) is connected to the acidic water tank (5) through a pipeline, and the top of the filter (2) is connected to the acidic water tank (5) through a pipeline. The filter bag (8) is provided with a steam coil (10) below it. The steam coil (10) is connected to a steam injection line (11) and a condensate outlet line (12). Both the steam injection line (11) and the condensate outlet line (12) extend to the outside of the filter (2).

2. The acidic water non-powered oil and impurity removal device as described in claim 1, characterized in that, The pipeline connecting the acidic water tank (5) and the separator (1) extends to the middle of the separator (1).

3. The acidic water non-powered oil and impurity removal device as described in claim 1, characterized in that, The number of filters (2) is two, and the two filters (2) are arranged side by side at the bottom of the separator (1).

4. The acidic water non-powered oil and impurity removal device as described in claim 1, characterized in that, The top of the separator (1) is connected to the bottom of the acidic water tank (5) via a pipeline, the bottom of the filter (2) is connected to the pipeline connecting the top of the separator (1) to the acidic water tank (5) via a pipeline, and the top of the filter (2) is connected to the top of the acidic water tank (5) via a pipeline.

5. The acidic water non-powered oil and impurity removal device as described in claim 3, characterized in that, The filter (2) is equipped with differential pressure monitoring instruments (9) on both the inlet and outlet pipelines.

6. A method for removing oil and impurities using the apparatus described in any one of claims 1-5, characterized in that, Includes the following steps: S1: The acidic wastewater transported from the acidic wastewater tank (3) first enters the separator (1). When the equipment is put into use for the first time, the top sludge discharge valve needs to be opened to exhaust the gas into the light sludge collection tank (4) so ​​that the liquid can completely fill the separator (1). S2: Acidic wastewater enters along the cross-section of the equipment and forms a rotating flow state in the separator (1). During the flow, solid impurities move to the inner wall of the separator (1) due to centrifugal force and converge to the bottom of the separator (1) along the inner wall of the separator (1). Light oil, due to its lighter specific gravity, moves to the top of the separator (1). After running for a period of time, the top oil drain valve is opened, and the light oil collected at the top is discharged to the light oil collection tank (4) using the internal pressure of the equipment. Then it is sent out together with other oil. S3: The separated solid impurities enter the filter (2) from the bottom pipeline of the separator (1) along with a small portion of acidic water to filter the solid impurities; S4: The acidic water separated by the separator (1) is transported by a pipeline extending to the middle of the separator (1) and combined with the acidic water filtered at the bottom of the filter (2) and sent to the acidic water tank (5). S5: When the pressure difference of one filter (2) is large, close the valve for acidic water to enter this filter (2), open the valve for acidic water to enter another filter (2), and put the other filter (2) into operation. S6: Open the pure water injection line (6) on the filter (2) to replace the acidic water in the filter (2); S7: After the replacement is completed, open the nitrogen valve, close the pure water valve, and squeeze out all the liquid in the filter (2) before closing the outlet valve of the filter (2); S8: Open the steam inlet valve and condensate outlet valve of the steam coil (10) to heat the filter (2); S9: Open the gas discharge valve at the top of the filter (2), slightly open the nitrogen valve, maintain the pressure inside the filter (2), and continue drying for 4-5 hours after the temperature rises. S10: After the drying process is completed, turn off the steam coil (10) and use nitrogen to purge the filter (2) to cool it down; S11: After the temperature drops, turn off the nitrogen gas. After the pressure in the filter (2) drops to the level of the pressure in the acidic water tank (5), close the gas discharge valve at the top of the filter (2). S12: Remove the top cover of filter (2), remove the filter bag (8), put the dry sludge and impurities in the filter bag (8) into the bag for treatment, then clean the filter bag (8), reinstall the cleaned filter bag (8) into the filter (2), and close the top cover of filter (2). S13: If the pressure difference across another filter (2) is large and cleaning is required, repeat steps S5-S12.

7. The method for removing oil and impurities as described in claim 6, characterized in that, The heating temperature of the steam coil (10) is 80-100℃.

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