Oil refining steam stripping purified water recycling device and method

Abstract

According to the oil refining steam stripping purified water recycling device and method, in the device, a heating disc is arranged on the lower surface of a distillation retort to heat the distillation retort; the sewage injection pipe is communicated with the distillation retort to inject oil refining sewage; the sewage discharge valve pipe is communicated with the distillation retort to discharge sewage; the air inlet end of the negative-pressure air pump is communicated with the distillation tank; the water collecting plate is installed on the condensation box and communicated with the air outlet end of the negative pressure air pump, the multiple liquefied water pipes are arranged in the condensation box and communicated with the water collecting plate through the air guide pipes, the adjacent liquefied water pipes are connected through the communicating pipes, the exhaust pipe is arranged on the liquefied water pipe at the tail of the liquefaction assembly, and the water collecting pipe is installed at the bottom of the liquefied water pipe. The device can be used for concentrating sewage and recycling steam stripping purified water.

Description

Technical Field

[0001] The invention relates to the technical field of refinery wastewater treatment, and in particular to a refinery steam stripping purified water recycling device and method. Background Art

[0002] Oil refining generally refers to petroleum refining. Originally, oil was separated by distillation to produce kerosene, gasoline, diesel and other fuel oils suitable for use in internal combustion engines, with petroleum gas and residual oil as by-products; components heavier than fuel oil were chemically converted into fuel oils through processes such as thermal cracking and catalytic cracking, and some of these fuel oils were refined by processes such as hydrogenation. The heaviest vacuum residue oil is produced by solvent deasphalting to produce deasphalted oil and petroleum asphalt, or heavy oil is cracked into fuel oil components through delayed coking process, and petroleum coke is produced as a by-product. However, the wastewater remaining in the oil refining process contains a large amount of sulfur and other elements. The sulfur-containing wastewater produced by oil refining is difficult to be directly reused in the next oil refining. The traditional sulfur-containing wastewater produced by oil refining has low water purification efficiency. At the same time, since the extracted purified water needs to be reused in the next oil refining production process, the use of a water purifier to filter the wastewater is inefficient, and the use of high-temperature boiling for distillation causes energy waste.

[0003] The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the invention

[0004] The purpose of the present invention is to provide a device and method for recycling refined steam stripping purified water, which uses low-temperature and low-pressure distillation to extract purified water and uses sewage circulation to concentrate sewage, thereby achieving the purpose of sewage concentration and steam stripping purified water recycling.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] An oil refining stripping purified water recycling device of the present invention comprises:

[0007] distillation tank;

[0008] A heating plate, which is disposed on the lower surface of the distillation tank to heat the distillation tank;

[0009] A sewage injection pipe connected to the distillation tank to inject sewage from oil refinery;

[0010] A sewage valve pipe connected to the distillation tank to discharge sewage;

[0011] A negative pressure air pump, the air inlet end of which is connected to the distillation tank;

[0012] A liquefaction assembly comprising,

[0013] Condensate box,

[0014] A water collecting plate is installed on the condensation box and connected to the air outlet of the negative pressure air pump.

[0015] A plurality of liquefied water pipes are arranged in the condensation tank and connected to the water collecting plate via air guide pipes, and adjacent liquefied water pipes are connected via connecting pipes.

[0016] The exhaust pipe is located at the liquefied water pipe at the tail of the liquefied component.

[0017] A water collecting pipe is installed at the bottom of the liquefied water pipe.

[0018] The oil refining stripping purified water recycling device further includes a flow guide component, which is arranged in the distillation tank to extend the flow of sewage therein, and the flow guide component includes:

[0019] at least one first baffle plate, which is spaced and laterally connected to the inner surface of the distillation tank,

[0020] At least one second baffle plate is spaced and laterally connected to the inner surface of the distillation tank, and the first baffle plate and the second baffle plate are staggered.

[0021] A plurality of top guide holes are provided on the upper part of the first spoiler and the second spoiler,

[0022] At least one bottom guide hole is opened at the bottom of the second spoiler,

[0023] The circulating water pump has a water inlet end connected to a sewage valve pipe, and a water outlet end connected to a sewage injection pipe.

[0024] In the oil refining stripping purified water recycling device, the lowest points of the multiple top guide holes are successively lowered from the sewage injection pipe to the sewage discharge valve pipe.

[0025] In the oil refining stripping purified water recycling device, the liquefaction component also includes:

[0026] A diversion water pipe connected to the water collecting pipe,

[0027] A drain valve is installed on the diversion water pipe to open and close the drainage.

[0028] The oil refining stripping purified water recycling device also includes a support frame, and the distillation tank and the condensation tank are supported on the support frame.

[0029] In the refinery stripping purified water recycling device, the condensate tank comprises a condensate water inlet pipe for injecting condensate water into the condensate tank and a condensate drain pipe for discharging condensate water from the condensate tank.

[0030] In the oil refining stripping purified water recycling device, a pressure device for pressure detection and a temperature sensor for internal liquid temperature detection are installed on the upper surface of the distillation tank.

[0031] In the oil refining stripping purified water recycling device, the air guide pipe, the exhaust pipe, the water collecting pipe, the connecting pipe and the liquefied water pipe constitute a secondary filtering structure.

[0032] In the oil refining stripping purified water recycling device, the connecting pipe is an inverted U-shaped structure.

[0033] The method and steps of using the oil refining stripping purified water recycling device include:

[0034] Step 1: injecting the wastewater from the oil refinery into the distillation tank through the wastewater injection pipe;

[0035] Step 2: Set the parameters, the heating plate heats the sewage inside the distillation tank to 20-35°C, and the negative pressure air pump makes the distillation tank form an atmospheric pressure of 0.6ka;

[0036] Step 3: low-pressure distillation. The water inside the distillation tank boils under low pressure and low temperature to form water vapor which enters the negative pressure air pump, while the circulating water pump circulates the sewage in the distillation tank.

[0037] Step 4: Distill and extract purified water. The water vapor inside the negative pressure air pump enters the air pipe, liquefied water pipe, connecting pipe and exhaust pipe through the water collecting plate, and the condensed water is injected into the condensation box through the condensation water inlet pipe. The condensed water inside the condensation box rises and is discharged from the condensation drain pipe. The water vapor is cooled and liquefied and condensed into water droplets in the liquefied water pipe, air pipe, connecting pipe and exhaust pipe.

[0038] Step 5: Replenishing sewage: replenishing sewage into the distillation tank through the sewage injection pipe according to the distillation volume;

[0039] Step 6: Purified water collection: the purified water in the liquefied water pipe is collected into the diversion water pipe through the water collecting pipe and then discharged from the drain valve;

[0040] Step 7, treating the concentrated wastewater in the distillation tank, wherein the wastewater is subjected to oxidation treatment, electrochemical treatment, chemical agent treatment and / or adsorption treatment;

[0041] Step eight, discharge, by continuously injecting sewage through the sewage injection pipe, the concentrated sewage inside the distillation tank is discharged through the sewage discharge valve pipe.

[0042] In the above technical scheme, the present invention provides a refinery stripping purified water reuse device, which has the following beneficial effects: the refinery stripping purified water reuse device allows the sewage in the distillation tank to circulate through the guide component arranged inside the distillation tank, which is convenient for extracting purified water when the sewage is distilled and concentrated, and the liquefaction component arranged in the distillation tank is convenient for liquefying the water vapor distilled at low temperature inside the distillation tank into water for extraction, which increases the convenience of extracting purified water from the sewage, and the guide component includes a first baffle and a second baffle, which facilitates the first baffle and the second baffle to make the sewage inside the distillation tank flow in an S-shaped line, thereby improving the sewage inside the distillation tank. The flow path and duration are convenient for low-temperature distillation of sewage, and the circulating water pump installed on the upper surface of the distillation tank facilitates the circulation of sewage inside the distillation tank from the tail to the head, so that the sewage circulates in the distillation tank, and the liquefaction component uses a negative pressure air pump to discharge the water vapor inside the distillation tank into the air duct, liquefied water pipe, connecting pipe and exhaust pipe, and the condensed water is injected into the condensation box through the condensation water inlet pipe and then discharged from the condensation drain pipe, so that the water vapor inside the liquefied water pipe, air duct, connecting pipe and exhaust pipe is cooled and liquefied and gathered in the liquefied water pipe, which increases the convenience of purifying sulfur-containing sewage and improves the efficiency of low-temperature distillation of purified water. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0044] Figure 1 It is a structural schematic diagram of the present invention;

[0045] Figure 2 It is a schematic diagram of the cross-sectional structure of the distillation tank in the present invention;

[0046] Figure 3 It is a schematic diagram of the half-section structure of the distillation tank in the present invention;

[0047] Figure 4 It is a schematic diagram of the structure of the liquefaction component in the present invention;

[0048] Figure 5 It is a schematic diagram of the three-dimensional structure of the liquefaction pipeline in the present invention;

[0049] Figure 6 It is a schematic diagram of the cross-sectional structure of the liquefaction pipeline in the present invention;

[0050] In the figure: 1. support frame; 2. distillation tank; 3. heating plate; 4. sewage injection pipe; 5. sewage discharge valve pipe; 6. circulating water pump; 7. first baffle; 8. second baffle; 9. top guide hole; 10. bottom guide hole; 11. negative pressure air pump; 12. pressure device; 13. temperature sensor; 14. condensation box; 15. water collecting plate; 16. liquefied water pipe; 17. air guide pipe; 18. connecting pipe; 19. exhaust pipe; 20. water collecting pipe; 21. drain valve; 22. condensation water inlet pipe; 23. condensation drain pipe; 24. diversion water pipe. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0054] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0055] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0056] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0058] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0059] See also Figure 1-6 As shown, in one embodiment, a refinery stripping purified water recycling device of the present invention comprises:

[0060] Distillation tank 2;

[0061] A heating plate 3, which is disposed on the lower surface of the distillation tank 2 to heat the distillation tank 2;

[0062] A sewage injection pipe 4, which is connected to the distillation tank 2 to inject the sewage of the oil refinery;

[0063] A sewage valve pipe 5, which is connected to the distillation tank 2 to discharge sewage;

[0064] A negative pressure air pump 11, the air inlet end of which is connected to the distillation tank 2;

[0065] A liquefaction assembly comprising,

[0066] Condensation box 14,

[0067] The water collecting plate 15 is installed on the condensation box 14 and connected to the air outlet of the negative pressure air pump 11.

[0068] A plurality of liquefied water pipes 16 are disposed in the condensation tank 14 and connected to the water collecting plate 15 via an air guide pipe 17. Adjacent liquefied water pipes 16 are connected via a connecting pipe 18.

[0069] The exhaust pipe 19 is provided at the liquefied water pipe 16 at the tail of the liquefied component.

[0070] The water collecting pipe 20 is installed at the bottom of the liquefied water pipe 16 .

[0071] In a preferred embodiment of the refinery stripping purified water reuse device, a flow guide component is further included, which is arranged in the distillation tank 2 to extend the flow of sewage therein, and the flow guide component includes:

[0072] At least one first baffle plate 7, which is spaced and laterally connected to the inner surface of the distillation tank 2,

[0073] At least one second baffle plate 8 is spaced and laterally connected to the inner surface of the distillation tank 2, and the first baffle plate 7 and the second baffle plate 8 are staggered.

[0074] A plurality of top guide holes 9 are provided on the upper part of the first spoiler 7 and the second spoiler 8.

[0075] At least one bottom guide hole 10 is opened at the bottom of the second spoiler 8,

[0076] The circulating water pump 6 has its water inlet end connected to the sewage valve pipe 5 and its water outlet end connected to the sewage injection pipe 4.

[0077] In the preferred embodiment of the refinery stripping purified water reuse device, the lowest points of the plurality of top flow guide holes 9 are sequentially lowered from the sewage injection pipe 4 toward the sewage discharge valve pipe 5 .

[0078] In a preferred embodiment of the refinery stripping purified water recycling device, the liquefaction component further comprises:

[0079] The diversion water pipe 24 is connected to the water collecting pipe 20.

[0080] The drain valve 21 is installed on the diversion water pipe 24 to open and close the drainage.

[0081] In a preferred embodiment of the oil refining stripping purified water recycling device, it also includes a support frame 1, and the distillation tank 2 and the condensation tank 14 are supported on the support frame 1.

[0082] In a preferred embodiment of the refinery stripping purified water recycling device, the condensate tank 14 includes a condensate water inlet pipe 22 for injecting condensate water into the condensate tank 14 and a condensate drain pipe 23 for discharging condensate water from the condensate tank 14 .

[0083] In the preferred embodiment of the refinery stripping purified water reuse device, a pressure device 12 for pressure detection and a temperature sensor 13 for internal liquid temperature detection are installed on the upper surface of the distillation tank 2.

[0084] In the preferred embodiment of the refinery stripping purified water reuse device, the air guide pipe 17, the exhaust pipe 19, the water collecting pipe 20, the connecting pipe 18 and the liquefied water pipe 16 constitute a secondary filtering structure.

[0085] In the preferred embodiment of the refinery stripping purified water recycling device, the connecting pipe 18 is an inverted U-shaped structure.

[0086] The method and steps of using the oil refining stripping purified water recycling device include:

[0087] Step 1, injecting the wastewater from the oil refinery, the wastewater is injected into the distillation tank 2 through the wastewater injection pipe 4;

[0088] Step 2, setting parameters, the heating plate 3 heats the sewage inside the distillation tank 2 to 20-35°C, and the negative pressure air pump 11 makes the distillation tank 2 form an atmospheric pressure of 0.6ka;

[0089] Step 3: low-pressure distillation. The water inside the distillation tank 2 boils under low pressure and low temperature to form water vapor which enters the negative pressure air pump 11, while the circulating water pump 6 makes the sewage in the distillation tank 2 circulate.

[0090] Step 4: distill and extract purified water. The water vapor inside the negative pressure air pump 11 enters the air pipe 17, the liquefied water pipe 16, the connecting pipe 18 and the exhaust pipe 19 through the water collecting plate 15, and the condensed water is injected into the condensation tank 14 through the condensation water inlet pipe 22. The condensed water inside the condensation tank 14 rises and is discharged from the condensation drain pipe 23. The water vapor is cooled and liquefied and condensed into water droplets in the liquefied water pipe 16, the air pipe 17, the connecting pipe 18 and the exhaust pipe 19.

[0091] Step 5, sewage replenishment, sewage is replenished into the distillation tank 2 through the sewage injection pipe 4 according to the distillation volume;

[0092] Step 6: Purified water collection: the purified water in the liquefied water pipe 16 is collected into the diversion water pipe 24 through the water collecting pipe 20 and then discharged from the drain valve 21;

[0093] Step 7, treating the concentrated wastewater in the distillation tank 2, wherein the wastewater is subjected to oxidation treatment, electrochemical treatment, chemical agent treatment and / or adsorption treatment;

[0094] Step eight, discharge, by continuously injecting sewage through the sewage injection pipe 4, the concentrated sewage inside the distillation tank 2 is discharged through the sewage discharge valve pipe 5.

[0095] In one embodiment, a refinery stripping purified water recycling device comprises:

[0096] Support frame 1;

[0097] A distillation tank 2, which is supported on the support frame 1;

[0098] A heating plate 3, which is disposed on the lower surface of the distillation tank 2 to heat the distillation tank 2;

[0099] A sewage injection pipe 4, which is connected to the distillation tank 2 to inject the sewage of the oil refinery;

[0100] A sewage valve pipe 5, which is connected to the distillation tank 2 to discharge sewage;

[0101] A negative pressure air pump 11, the air inlet end of which is connected to the distillation tank 2;

[0102] A flow guide assembly is arranged in the distillation tank 2 to extend the flow of sewage therein, and the flow guide assembly includes:

[0103] At least one first baffle plate 7, which is spaced and laterally connected to the inner surface of the distillation tank 2,

[0104] At least one second baffle plate 8 is spaced and laterally connected to the inner surface of the distillation tank 2, and the first baffle plate 7 and the second baffle plate 8 are staggered.

[0105] A plurality of top guide holes 9 are provided on the upper part of the first baffle plate 7 and the second baffle plate 8. The lowest part of the plurality of top guide holes 9 is successively lowered from the sewage injection pipe 4 to the sewage discharge valve pipe 5.

[0106] At least one bottom guide hole 10 is opened at the bottom of the second spoiler 8,

[0107] A circulating water pump 6, whose water inlet end is connected to a sewage valve pipe 5, and whose water outlet end is connected to a sewage injection pipe 4;

[0108] A liquefaction assembly comprising,

[0109] The condensation box 14 is fixed on the support frame 1.

[0110] The water collecting plate 15 is installed on the condensation box 14 and connected to the air outlet of the negative pressure air pump 11.

[0111] A plurality of liquefied water pipes 16 are disposed in the condensation tank 14 and connected to the water collecting plate 15 via an air guide pipe 17. Adjacent liquefied water pipes 16 are connected via a connecting pipe 18.

[0112] The exhaust pipe 19 is provided at the liquefied water pipe 16 at the tail of the liquefied component.

[0113] The water collecting pipe 20 is installed at the bottom of the liquefied water pipe 16.

[0114] The diversion water pipe 24 is connected to the water collecting pipe 20.

[0115] The drain valve 21 is installed on the diversion water pipe 24 to open and close the drainage.

[0116] In one embodiment, a refinery steam stripping purified water reuse device comprises a support frame 1 for support, and a distillation tank 2 for distilling sulfur-containing wastewater is installed above the support frame 1, a heating plate 3 for heating is installed on the lower surface of the distillation tank 2, a sewage injection pipe 4 for sewage injection is installed on the upper surface of one end of the distillation tank 2, and a sewage discharge valve pipe 5 for sewage discharge is installed on the lower surface of the other end of the distillation tank 2. The distillation tank 2 is provided with a guide component for extending the flow of internal sewage, and a liquefaction component for liquefying distilled water vapor is also provided on the side of the distillation tank 2; the guide component comprises a first baffle plate 7 and a second baffle plate 8 welded at equal intervals on the inner surface of the distillation tank 2, and the first baffle plate 7 and the second baffle plate 8 are staggered, the upper parts of the first baffle plate 7 and the second baffle plate 8 are both provided with top guide holes 9, and the lower part of the second baffle plate 8 is provided with bottom guide holes 10, the lowest point of the top guide hole 9 is successively lowered by 50 mm from the sewage injection pipe 4 to the sewage discharge valve pipe 5, and the upper surface of the distillation tank 2 is provided with a first baffle plate 7 and a second baffle plate 8. A circulating water pump 6 is installed, and the water inlet end of the circulating water pump 6 is connected to the sewage valve pipe 5 through a water pipe, and the water outlet end of the circulating water pump 6 is connected to the sewage injection pipe 4 through a water pipe; the liquefaction component includes a condensation tank 14 fixed on the support frame 1, and a water collecting plate 15 installed on the upper surface of the condensation tank 14, and the water collecting plate 15 is connected to the air outlet end of the negative pressure air pump 11 installed on the upper surface of the distillation tank 2, and the air inlet end of the negative pressure air pump 11 is connected to the distillation tank 2, and a liquefied water pipe 16 is installed inside the condensation tank 14, and the liquefied The water pipe 16 is connected to the water collecting plate 15 through the air guide pipe 17, and two adjacent liquefied water pipes 16 are connected by a connecting pipe 18. The liquefied water pipe 16 located at the tail of the liquefaction component is equipped with an exhaust pipe 19, and a water collecting pipe 20 is installed at the lower part of the exhaust pipe 19. The water collecting pipe 20 is equipped with a drain valve 21 through a guide water pipe 24; a pressure gauge 12 for pressure detection is installed on the upper surface of the distillation tank 2, and a temperature sensor 13 for internal liquid temperature detection is also installed on the upper surface of the distillation tank 2.

[0117] In this embodiment, the diversion assembly provided inside the distillation tank 2 allows the sewage inside the distillation tank 2 to circulate, which is convenient for extracting purified water when the sewage is distilled and concentrated. The liquefaction assembly provided in the distillation tank 2 is convenient for liquefying the water vapor distilled at low temperature inside the distillation tank 2 into water for extraction, which increases the convenience of extracting purified water from the sewage. The diversion assembly includes a first baffle plate 7 and a second baffle plate 8, which facilitates the first baffle plate 7 and the second baffle plate 8 to make the sewage inside the distillation tank 2 flow in an S-shaped line, thereby improving the path and duration of the sewage flowing inside the distillation tank 2, and facilitating the low-temperature distillation of the sewage. The distillation tank 2 is provided with a plurality of baffle plates 7 and 8 on the upper surface thereof. The circulating water pump 6 facilitates the sewage inside the distillation tank 2 to circulate from the tail to the head, so that the sewage circulates in the distillation tank 2, and the liquefaction component discharges the water vapor inside the distillation tank 2 into the air guide pipe 17, the liquefied water pipe 16, the connecting pipe 18 and the exhaust pipe 19 through the negative pressure air pump 11, and the condensed water is injected into the condensation box 14 through the condensation water inlet pipe 22 and then discharged from the condensation drain pipe 23, so that the water vapor inside the liquefied water pipe 16, the air guide pipe 17, the connecting pipe 18 and the exhaust pipe 19 is cooled and liquefied and gathered in the liquefied water pipe 16, which increases the convenience of purifying water from sulfur-containing sewage and improves the efficiency of low-temperature distillation of purified water. Specifically, the heating plate 3 is an arc-shaped plate component. Specifically, the first baffle 7 and the second baffle 8 are both circular metal plates. Specifically, six first baffles 7 are provided and five second baffles 8 are provided. Specifically, an air guide pipe 17 , an exhaust pipe 19 , a water collecting pipe 20 , two connecting pipes 18 and three liquefied water pipes 16 form a secondary filtering structure, and nineteen secondary filtering mechanisms are installed inside the condensation box 14 .

[0118] A method for refining steam stripping purified water recycling device comprises the following steps:

[0119] Step 1: injecting sewage, the sewage is injected from the sewage injection pipe 4 to the closed sewage discharge valve pipe 5;

[0120] Step 2, setting parameters, the heating plate 3 heats the sewage inside the distillation tank 2 to 20-35°C, and the negative pressure air pump 11 forms an atmospheric pressure of 0.6ka in the distillation tank 2;

[0121] Step 3: low-pressure distillation. The water in the distillation tank 2 boils under low pressure and low temperature to form water vapor which enters the negative pressure air pump 11, and the circulating water pump 6 makes the sewage in the sewage valve pipe 5 circulate.

[0122] Step 4: distill and extract purified water. The water vapor inside the negative pressure air pump 11 enters the air pipe 17, the liquefied water pipe 16, the connecting pipe 18 and the exhaust pipe 19 through the water collecting plate 15, and the condensed water is injected into the condensation tank 14 through the condensation water inlet pipe 22. The condensed water inside the condensation tank 14 rises and is discharged from the condensation drain pipe 23. The water vapor is cooled and liquefied and condensed into small water droplets in the liquefied water pipe 16, the air pipe 17, the connecting pipe 18 and the exhaust pipe 19.

[0123] Step 5, sewage replenishment, according to the distillation volume, sewage is replenished into the distillation tank 2 through the sewage injection pipe 4;

[0124] Step 6: Purified water collection: the purified water in the liquefied water pipe 16 is collected into the diversion water pipe 24 through the water collecting pipe 20 and then discharged from the drain valve 21;

[0125] Step 7: concentrated wastewater treatment, wherein:

[0126] S1, advanced oxidation treatment, Fenton reaction is carried out on sewage. A mixed solution of hydrogen peroxide and divalent iron ions oxidizes carboxylic acids, alcohols, and esters of organic compounds in sewage into inorganic states, and has the performance of removing difficult-to-degrade organic pollutants in sewage. The Fenton reaction uses divalent iron ions and hydrogen peroxide to react under appropriate conditions to generate highly oxidizing hydroxyl free radicals and hydroxide ions. These free radicals can oxidize and decompose organic pollutants and convert them into low-toxic or non-toxic small molecules, thereby achieving the purpose of purifying water quality. The principle of the Fenton reaction is based on the decomposition of hydrogen peroxide under the catalytic action of divalent iron ions to produce hydroxyl free radicals. The oxidation potential of this free radical reaches 2.8V, and it can oxidize and decompose organic matter into small molecules through electron transfer and other pathways. At the same time, during the reaction, divalent iron ions are oxidized into trivalent iron ions to produce coagulation precipitation, thereby removing a large amount of organic matter; the Fenton process has many application values ​​in industrial wastewater treatment, and can effectively degrade various organic wastes, including phenol, phenolphthalein, cyanide, dyes, etc., making the wastewater clear and transparent and meeting the discharge standards. At the same time, the process can also treat wastewater containing heavy metals, reducing heavy metal ions to their corresponding hydroxides, so that the heavy metals in the wastewater are precipitated and removed.

[0127] S2, electrochemical treatment, sewage is treated by electrolytic oxidation or electrocatalytic oxidation in electrochemical methods. The organic matter and oxides in the sewage are degraded under the action of electric current or electric potential. It is highly efficient and does not require the addition of additional chemicals. Electrocatalytic oxidation refers to the process of generating various free radicals in sewage under the action of an electric field to decompose the organic matter in the sewage on the surface of an electrode. This type of active free radical has a strong oxidizing property. When electrocatalytic oxidation technology is applied to sewage, this type of active free radical is used to degrade the organic matter in the polluted water, thereby playing a role in controlling chemical water pollution. The principle of electrocatalytic oxidation technology for controlling chemical water pollution is to produce a redox reaction with the organic matter contained in the sewage through active free radicals, so that the organic matter in the water is oxidized into carbon dioxide, water and small molecular organic matter.

[0128] S3, green chemical treatment, uses biodegradable agents and natural plant extracts to precipitate, adjust pH, and remove heavy metals in sewage; biodegradation technology uses microorganisms, plants or their metabolites to treat pollutants in wastewater. For heavy metal pollution, biodegradation technologies include: bioadsorption, bioprecipitation, bio-oil droplet release and biotransformation; among them, bioadsorption adsorbs heavy metal ions in wastewater through the special structure of the microbial cell surface to form a stable complex; bioprecipitation uses extracellular polymers produced by microorganisms and other substances to combine with heavy metal ions in wastewater to form precipitates or precipitates; bio-oil droplet release refers to the ability of some microorganisms to secrete oil droplets that can combine with heavy metals in wastewater and precipitate; biotransformation refers to the ability of some microorganisms to convert heavy metal ions in wastewater into harmless substances.

[0129] S4, adsorption treatment, uses functional porous materials and nanomaterials to adsorb organic matter, pigments and heavy metal ions that cannot be completely removed from wastewater; in the chemical treatment of oil refining stripping purified water reuse equipment, it can effectively improve the efficiency of wastewater treatment, reduce costs and environmental impact, meet the requirements of sustainable development, and improve the water quality reuse rate;

[0130] Step eight, concentrated wastewater is discharged. By continuously injecting wastewater through the wastewater injection pipe 4, the concentrated wastewater inside the distillation tank 2 is discharged through the wastewater discharge valve pipe 5.

[0131] Specifically, in step 1, the amount of sewage injected is enough to reach two-thirds of the volume inside the distillation tank 2.

[0132] Specifically, in step 2, the temperature sensor 13 is used to detect the temperature of the sewage inside the distillation tank 2, the heating plate 3 is used to heat the sewage inside the distillation tank 2, the negative pressure air pump 11 is used to draw negative pressure inside the distillation tank 2, and the pressure device 12 is used to detect the internal pressure of the distillation tank 2.

[0133] Specifically, in step 4, water vapor first enters the liquefied water pipe 16 through the air guide pipe 17 , the water vapor in two adjacent liquefied water pipes 16 flows through the connecting pipe 18 , and the air inside the last liquefied water pipe 16 is discharged through the exhaust pipe 19 .

[0134] Finally, it should be noted that the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of the present application.

[0135] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A refinery stripping purified water recycling device, characterized in that: These include, distillation tank; A heating plate, which is disposed on the lower surface of the distillation tank to heat the distillation tank; A sewage injection pipe connected to the distillation tank to inject sewage from oil refinery; A sewage valve pipe connected to the distillation tank to discharge sewage; A negative pressure air pump, the air inlet end of which is connected to the distillation tank; A liquefaction assembly comprising, Condensate box, A water collecting plate is installed on the condensation box and connected to the air outlet of the negative pressure air pump. A plurality of liquefied water pipes are arranged in the condensation tank and connected to the water collecting plate via air guide pipes, and adjacent liquefied water pipes are connected via connecting pipes. The exhaust pipe is located at the liquefied water pipe at the tail of the liquefied component. A water collecting pipe is installed at the bottom of the liquefied water pipe.

2. A refinery stripping purified water recycling device according to claim 1, characterized in that: It also includes a diversion component, which is arranged in the distillation tank to extend the flow of sewage therein, and the diversion component includes: at least one first baffle plate, which is spaced and laterally connected to the inner surface of the distillation tank, At least one second baffle plate is spaced and laterally connected to the inner surface of the distillation tank, and the first baffle plate and the second baffle plate are staggered. A plurality of top guide holes are provided on the upper part of the first spoiler and the second spoiler, At least one bottom guide hole is opened at the bottom of the second spoiler, The circulating water pump has a water inlet end connected to a sewage valve pipe, and a water outlet end connected to a sewage injection pipe.

3. A refinery stripping purified water recycling device according to claim 2, characterized in that: The lowest points of the multiple top diversion holes are successively lowered from the sewage injection pipe to the sewage discharge valve pipe.

4. A refinery stripping purified water recycling device according to claim 1, characterized in that: The liquefaction component also includes, A diversion water pipe connected to the water collecting pipe, A drain valve is installed on the diversion water pipe to open and close the drainage.

5. A refinery stripping purified water recycling device according to claim 1, characterized in that: It also comprises a support frame, on which the distillation tank and the condensation box are supported.

6. A refinery stripping purified water recycling device according to claim 1, characterized in that: The condensation tank comprises a condensation water inlet pipe for injecting condensation water into the condensation tank and a condensation drain pipe for draining the condensation water in the condensation tank.

7. The device for recycling refined stripping purified water according to claim 1, characterized in that: A pressure sensor for pressure detection and a temperature sensor for internal liquid temperature detection are installed on the upper surface of the distillation tank.

8. The device for recycling purified water from oil stripping in oil refinery according to claim 1, characterized in that: The air guide pipe, the exhaust pipe, the water collecting pipe, the connecting pipe and the liquefied water pipe constitute a secondary filtering structure.

9. The device for recycling purified water from oil stripping according to claim 1, characterized in that: The connecting pipe is an inverted U-shaped structure.

10. A method for using the refinery stripping purified water recycling device according to any one of claims 1 to 9, characterized in that: The steps include, Step 1: injecting the wastewater from the oil refinery into the distillation tank through the wastewater injection pipe; Step 2: Set the parameters, the heating plate heats the sewage inside the distillation tank to 20-35°C, and the negative pressure air pump makes the distillation tank form an atmospheric pressure of 0.6ka; Step 3: low-pressure distillation. The water inside the distillation tank boils under low pressure and low temperature to form water vapor which enters the negative pressure air pump, while the circulating water pump circulates the sewage in the distillation tank. Step 4: Distill and extract purified water. The water vapor inside the negative pressure air pump enters the air pipe, liquefied water pipe, connecting pipe and exhaust pipe through the water collecting plate, and the condensed water is injected into the condensation box through the condensation water inlet pipe. The condensed water inside the condensation box rises and is discharged from the condensation drain pipe. The water vapor is cooled and liquefied and condensed into water droplets in the liquefied water pipe, air pipe, connecting pipe and exhaust pipe. Step 5: Replenishing sewage: replenishing sewage into the distillation tank through the sewage injection pipe according to the distillation volume; Step 6: Purified water collection: the purified water in the liquefied water pipe is collected into the diversion water pipe through the water collecting pipe and then discharged from the drain valve; Step 7, treatment of concentrated wastewater in the distillation tank, wherein the wastewater is subjected to oxidation treatment, electrochemical treatment, chemical agent treatment and / or adsorption treatment: Step eight, discharge, by continuously injecting sewage through the sewage injection pipe, the concentrated sewage inside the distillation tank is discharged through the sewage discharge valve pipe.

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