A concentrated water treatment device for methanol-to-olefins production

Abstract

A concentrated water treatment device for methanol-to-olefins (MTO) belongs to the field of methanol-to-olefins technology. The concentrated water treatment device consists of a wastewater stripping system, a concentrated water recycling system, and a concentrated water treatment system. The wastewater stripping system comprises a water mixing tank, a wastewater feed pump, inlet and outlet heat exchangers, a wastewater stripping tower, a reboiler, and a purified water pump. The concentrated water recycling system comprises a cooler, a reflux tank, and a concentrated water reflux pump. The concentrated water treatment system comprises a concentrated water storage tank, a mixed oil tank, and a mixed oil delivery pump. This invention adds a concentrated water treatment system, allowing the treated concentrated water to be returned to the system for further recycling, while the generated mixed oil is delivered externally, improving the economic efficiency of the unit. It optimizes the wastewater stripping tower system process, ensuring the stripping effect of the wastewater stripping tower and reducing energy consumption. The treated concentrated water ensures the quality of the purified water, meeting the water requirements of downstream units. It reduces the amount of grease generated in the alkaline washing tower of the separation unit, indirectly reducing the amount of grease inhibitor injected.

Description

Technical Field

[0001] This utility model belongs to the field of methanol-to-olefins technology, specifically relating to a concentrated water treatment device for methanol-to-olefins. Background Technology

[0002] In methanol-to-olefins (MTO) plants, methanol, under the action of a catalyst, produces ethylene and propylene, along with approximately 56% water and oxygen-containing compounds such as aldehydes and ketones as byproducts. This water containing dissolved oxygen-containing compounds is washed down in a water scrubbing tower and then enters a wastewater stripping tower. The main function of the wastewater stripping tower is to strip this water. The purified water after stripping is sent to downstream utilities for treatment, while the methanol and dimethyl ether (DME) and other non-condensable gases in the water are stripped and returned to the reactor for reprocessing to reduce the unit's methanol consumption. Other oxygen-containing compounds in the wastewater stripping water are further concentrated to form concentrated water.

[0003] Currently, the concentrated water from the plant often suffers from problems such as increased grease production in the separation unit, blockage of the concentrated water heat exchanger, and exacerbation of slagging in the gasifier. The main problems are as follows:

[0004] 1. Because the concentrated water contains a large amount of aldehydes and ketones, the aldehydes and ketones after the concentrated water is recycled cannot react with the catalyst after entering the reactor. As the product gas enters the alkaline washing tower of the separation unit, the alkaline washing tower is an alkaline environment. Under alkaline conditions, aldehydes and ketones are more likely to undergo condensation reaction to generate a large amount of butter, which weakens the washing effect of the alkaline washing tower on the product gas and increases the amount of butter inhibitor injected, thus increasing the operating cost of the unit.

[0005] 2. Since the aldehydes and ketones in the concentrated water are toxic to the bacteria in the downstream water treatment system, the concentrated water cannot be directly sent to the downstream public utility for treatment. Therefore, it is necessary to return the concentrated water to the methanol conversion reactor after vaporization. However, heating the concentrated water will also promote the condensation of aldehydes and ketones in the concentrated water, and the generated butter-like substances will clog the heat exchanger, so the heat exchanger must be cleaned offline.

[0006] 3. Some coal-to-olefins plants send concentrated water from the methanol-to-olefins unit to the methanol unit for coal-water slurry distribution, but it has been found that this exacerbates slagging in the gasifier during operation. Utility Model Content

[0007] To address the problems of increased grease production in the separation unit, clogging of the concentrated water heat exchanger, and exacerbation of slagging in the gasifier caused by concentrated water, this invention provides a concentrated water treatment device for methanol-to-olefins production.

[0008] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0009] A concentrated water treatment unit for methanol-to-olefins production comprises a wastewater stripping system, a concentrated water recycling system, and a concentrated water treatment system. The wastewater stripping system consists of a water mixing tank, a wastewater feed pump, feed and discharge heat exchangers, a wastewater stripping tower, a reboiler, and a purified water pump. The water mixing tank, wastewater feed pump, feed and discharge heat exchangers, and wastewater stripping tower are connected sequentially. The shell side of the reboiler is installed between the bottom outlet and the lower side inlet of the wastewater stripping tower, while saturated steam flows through the tube side of the reboiler. The purified water pump is connected between the bottom outlet of the wastewater stripping tower and the feed and discharge heat exchangers. The concentrated water recycling system consists of a cooler, a reflux tank, and a concentrated water reflux pump. The shell-side inlet of the cooler is connected to the top outlet of the wastewater stripping tower, and circulating water flows through the tube side of the cooler. The shell-side outlet is connected to the reflux tank, the top outlet of the reflux tank is connected to the reactor, and the bottom outlet of the reflux tank is connected to the inlet of the concentrate reflux pump. The concentrate treatment system consists of a concentrate storage tank, a mixed oil tank, and a mixed oil delivery pump. A heating coil is installed inside the concentrate storage tank, using saturated steam as the heat source. The top outlet of the concentrate storage tank is connected to the thermal incinerator, and the bottom outlet of the concentrate storage tank is connected to the front end of the water mixing tank via the concentrate reflux pump, forming a concentrate reflux pipeline. The side outlet of the concentrate storage tank is connected to the top inlet of the mixed oil tank, and the bottom outlet of the mixed oil tank is connected to the mixed oil delivery pump. The outlet of the concentrate reflux pump is divided into two branches, one branch connected to the concentrate storage tank and the other branch connected to the upper side of the wastewater stripping tower.

[0010] The oily wash water at 85-95℃ from the washing tower enters the water mixing tank, and is then pressurized to 1.0MPa by the wastewater feed pump before being sent to the feed and discharge heat exchangers. After heat exchange to 95-110℃, it enters the wastewater stripping tower from the side and middle. Part of the bottom water discharged from the bottom outlet of the wastewater stripping tower enters the shell side of the reboiler, where it is heated to 130-140℃ by countercurrent heat exchange with saturated steam at 1.0MPa, becoming a gas-liquid mixture. This mixture then returns from the lower side to the wastewater stripping tower, forming rising steam. Steam and oily wash water in the wastewater stripping tower undergo mass and heat transfer. Methanol, dimethyl ether, and aldehydes / ketones in the oily wash water are evaporated and carried to the top of the wastewater stripping tower by the rising steam to form overhead gas. The tower pressure of the wastewater stripping tower is controlled at 0.15–0.25 MPa. Another portion of the bottom water discharged from the bottom outlet of the wastewater stripping tower is pressurized by a purified water pump and sent to the feed heat exchanger. After heat exchange with the oily wash water from the water mixing tank, bottom water at 95–110°C is obtained and sent to a utility plant for treatment. When the device of this invention is first started, the bottom water contains oil; however, as the device operates, the methanol, dimethyl ether, and aldehydes / ketones in the oily wash water are evaporated and carried to the top of the wastewater stripping tower by the rising steam to form overhead gas. This greatly reduces the oil content of the bottom water discharged from the bottom outlet of the wastewater stripping tower, meeting the requirements for external distribution. The circulating water at 25°C in the cooler tubes cools the overhead gas from the top outlet of the wastewater stripping tower to 95-100°C before it enters the reflux tank for gas-liquid separation. The non-condensable gas obtained in the reflux tank (methanol and dimethyl ether in the overhead gas, which are gaseous at temperatures above 95°C) is sent to the reactor for reprocessing through the top outlet of the reflux tank. The concentrated water obtained in the reflux tank (water vapor and aldehydes and ketones in the overhead gas are cooled to form concentrated water) is sent to the concentrated water reflux pump through the bottom outlet of the reflux tank. The outlet of the concentrated water reflux pump is divided into two branches. The concentrated water from one branch is sent to the upper part of the wastewater stripping tower for reflux to establish the tray liquid level for mass and heat transfer. The concentrated water from the other branch is sent to the concentrated water storage tank. Saturated steam at 1.0 MPa heats the concentrated water in the concentrated water storage tank to 60-70°C. At this temperature, the residual oil in the concentrated water will accelerate stratification and accumulate at the top of the concentrated water storage tank. Some aldehydes and ketones in the concentrated water will volatilize and be sent to the regenerative thermal oxidizer for incineration through the top outlet of the concentrated water storage tank. The concentrated water treated by the concentrated water storage tank is discharged from the bottom outlet of the concentrated water storage tank, and after being pressurized by the concentrated water return pump, it enters the water mixing tank together with the oily wash water from the water washing tower. The residual oil that accumulates at the top of the concentrated water storage tank is sent to the residual oil tank, and after being pressurized by the residual oil external transfer pump, it is loaded onto trucks for external transportation.

[0011] Compared with the prior art, the advantages of this utility model are as follows:

[0012] (1) A concentrated water treatment system was added. The concentrated water is treated and returned to the system for further refining. The generated scrap oil is sent out, which improves the economic efficiency of the unit.

[0013] (2) The process of the wastewater stripping tower system was optimized, which ensured the stripping effect of the wastewater stripping tower and reduced energy consumption.

[0014] (3) The concentrated water is treated to ensure the quality of the purified water and meet the water demand of downstream units.

[0015] (4) It reduced the amount of butter generated in the alkaline washing tower of the separation unit, which indirectly reduced the amount of butter inhibitor injected. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0017] Figure 1 : A schematic diagram of the structure of a concentrated water treatment device for methanol-to-olefins according to this utility model;

[0018] In the figure: Wastewater stripping tower 1 is a sieve tower with 52 trays, a design pressure of 0.61MPa(G), a design temperature of 170℃, a lower inner diameter (mm) of 2800, an upper inner diameter (mm) of 2400, a height of 40330mm, and is made of Q345R.

[0019] The water mixing tank 2 is designed for a temperature of 120℃, a pressure of 0.48MPa(G), an inner diameter of 4000mm, a height of 10000mm, and is made of Q245R material.

[0020] The reflux tank 3 is designed for a temperature of 138℃, a pressure of 0.6MPa(G), an inner diameter of 2000mm, a length of 6000mm, and is made of Q245R material.

[0021] The specifications of reboiler 4 are BJS1800-1.86 / 2.15-1410-9 / 25-4I (B=600);

[0022] The concentrated water storage tank 5 is designed for a temperature of 60℃, a pressure of 2000 Pa(G), an inner diameter of 14500 mm, a height of 15850 mm, and a volume of 2000 m³. 3 The material is Q245R;

[0023] Mixed oil tank 6 is designed for a temperature of 60℃ and a pressure of 0.35MPa(G), with an inner diameter of 3200mm, a length of 13700mm, and a volume of 106m³. 3 The material is Q245R;

[0024] The specifications of the inlet and outlet heat exchanger 7 are BES1400-1.84-566-6 / 25-2I (B=450);

[0025] The specifications of the wastewater stripping tower cooler 8 are BES1400-1.84-554-6 / 25-2I (B=450);

[0026] Wastewater feed pump 9 is of type OH2, with a design temperature of 70.4℃, inlet / outlet pressures of 0.15 / 1.26 MPa(G), and a rated flow rate of 280 m³ / h. 3 / h, explosion-proof rating is dIIBT4, material is S-6;

[0027] The purified water pump 10 is of type OH2, with a design temperature of 148℃, inlet / outlet pressures of 0.48 / 1.40 MPa(G), and a rated flow rate of 280 m³ / h. 3 / h, explosion-proof rating is dIIBT4, material is S-6;

[0028] The concentrated water reflux pump 11 is of type OH2, with a design temperature of 115℃, inlet / outlet pressures of 0.40 / 1.17 MPa(G), and a rated flow rate of 58 m³ / h. 3 / h, explosion-proof rating is dIIBT4, material is S-6;

[0029] The mixed oil transfer pump 12 is a centrifugal pump with a design temperature of 40℃, inlet / outlet pressure of 0.1 / 0.57 MPa(G), and a rated flow rate of 80 m³ / h. 3 / h, explosion-proof rating is dIIBT4, material is S-6;

[0030] The concentrated water recycling pump 13 is of type OH2, with a design temperature of 40℃, inlet / outlet pressures of 0.11 / 0.67 MPa(G), and a rated flow rate of 12 m³ / h. 3 / h, explosion-proof rating is dIIBT4, material is S-6;

[0031] Heating coil 14 is F=30m 2 The DN50 / PN5.0 is made of 10 / Q345R material. Detailed Implementation

[0032] To clearly and completely describe the technical solution and its specific working process of this utility model, the specific embodiments of this utility model are as follows, in conjunction with the accompanying drawings:

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0036] Example 1

[0037] like Figure 1As shown, a concentrated water treatment device for methanol-to-olefins includes a wastewater stripping system, a concentrated water recycling system, and a concentrated water treatment system. The wastewater stripping system consists of a water mixing tank 2, a wastewater feed pump 9, inlet / outlet heat exchangers 7, a wastewater stripping tower 1, a reboiler 4, and a purified water pump 10. The water mixing tank 2, wastewater feed pump 9, inlet / outlet heat exchangers 7, and wastewater stripping tower 1 are connected sequentially. The shell side of the reboiler 4 is installed between the bottom outlet and the lower side inlet of the wastewater stripping tower 1, and saturated steam flows through the tube side of the reboiler 4. The purified water pump 10 is connected between the bottom outlet of the wastewater stripping tower 1 and the inlet / outlet heat exchanger 7. The concentrated water recycling system consists of a cooler 8, a reflux tank 3, and a concentrated water reflux pump 11. The shell-side inlet of the cooler 8 is connected to the top outlet of the wastewater stripping tower 1, and circulating water flows through the tube side of the cooler 8. The shell-side outlet of the cooler 8 is connected to the reflux tank 3, and the top outlet of the reflux tank 3 is connected to... The reactor is connected, and the bottom outlet of the reflux tank 3 is connected to the inlet of the concentrated water reflux pump 11; the concentrated water treatment system consists of a concentrated water storage tank 5, a mixed oil tank 6, and a mixed oil external pump 12; a heating coil 14 is installed inside the concentrated water storage tank 5, using saturated steam as a heat source; the top outlet of the concentrated water storage tank 5 is connected to a thermal incinerator, and the bottom outlet of the concentrated water storage tank 5 is connected to the front end of the water mixing tank 2 via the concentrated water refining pump 13, forming a concentrated water refining pipeline; the side outlet of the concentrated water storage tank 5 is connected to the top inlet of the mixed oil tank 6, and the bottom outlet of the mixed oil tank 6 is connected to the mixed oil external pump 12; the outlet of the concentrated water reflux pump 11 is divided into two branches, one branch is connected to the concentrated water storage tank 5, and the other branch is connected to the upper side of the wastewater stripping tower 1.

[0038] The product gas generated from the methanol reaction enters the water washing tower, where it comes into countercurrent contact with the washing water for washing. Approximately 180–220 t / h of the oil-water mixture generated from the reaction is washed away to obtain oily wash water, which then enters the water mixing tank 2. This oily wash water is pressurized to 1.0 MPa by the wastewater feed pump 9 and then heated to 95–110°C by the feed heat exchanger 7 (the wastewater stripping tower 1 first establishes energy balance through full reflux, and then gradually establishes material feed balance after the oily wash water begins to be fed). It then enters the wastewater stripping tower 1. The wastewater stripping tower has a tower pressure of 0.15–0.25 MPa. The 1.0 MPa steam from the reboiler 4 heats the bottom water to 130–140°C, turning it into a gas-liquid mixture. This mixture rises within the tower and exchanges gas and liquid with the wastewater. Methanol, dimethyl ether, and aldehydes and ketones in the wastewater evaporate and are carried to the top of the tower for separation.

[0039] The gas at the top of the wastewater stripping tower 1, initially at 120–130°C, is cooled to 95–100°C by cooler 8 before entering reflux tank 3. The gas at the top of reflux tank 3, approximately 1500–3000 Nm³, is then cooled by cooler 8. 3Non-condensable gas is returned to the reactor for reprocessing. The concentrated water in the reflux tank 3 is pressurized by the concentrated water reflux pump 11, and one stream of about 25-30 t / h enters the wastewater stripping tower 1 from the top of the tower to continue gas-liquid exchange, while another stream of about 2-5 t / h of concentrated water is sent to the concentrated water storage tank 5.

[0040] The concentrated water in the concentrated water storage tank 5 is heated to a temperature of 60-70°C by introducing 1.0 MPa steam into the heating coil 14. At this temperature, aldehydes and ketones in the concentrated water volatilize and are sent to the regenerative incinerator for combustion through the top outlet of the concentrated water storage tank 5. Simultaneously, due to the heating of the concentrated water in the concentrated water storage tank 5, the aldehydes and ketones in the concentrated water accelerate condensation to form oily substances that float on the top of the concentrated water. These oily substances, along with the settled oily substances, are sent to the mixed oil tank 6 through the top outlet of the concentrated water storage tank 5. The concentrated water treated in the concentrated water storage tank 5 is discharged from the bottom of the concentrated water storage tank 5, and then pressurized by the concentrated water return pump 13 before entering the water mixing tank 2 together with the oily wash water from the water washing tower.

[0041] After treatment by the concentrated water treatment system, the oxygen content in the concentrated water decreased from 820,000 mg / L to 320,000 mg / L, with a removal rate of 60.98%; acetone decreased from 400,000 mg / L to 80,000 mg / L, with a removal rate of 80%; and propionaldehyde decreased from 4,200 mg / L to 700 mg / L, with a removal rate of 83.33%.

[0042] The technical solution of this utility model solves the problems that the concentrated water in the current equipment often has, such as increasing the amount of grease generated in the separation unit, clogging the concentrated water heat exchanger, and aggravating slagging in the gasifier.

[0043] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various variations and modifications can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0044] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0045] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0046] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A concentrated water treatment device for methanol-to-olefins production, characterized in that: It consists of a wastewater stripping system, a concentrated water recycling system, and a concentrated water treatment system. The wastewater stripping system consists of a water mixing tank (2), a wastewater feed pump (9), a feed heat exchanger (7), a wastewater stripping tower (1), a reboiler (4), and a purified water pump (10). The water mixing tank (2), the wastewater feed pump (9), the feed heat exchanger (7), and the wastewater stripping tower (1) are connected in sequence. The shell side of the reboiler (4) is installed at the bottom outlet of the wastewater stripping tower (1). Between the reboiler (4) and the lower side inlet, saturated steam flows through the tube side; the purified water pump (10) is connected between the bottom outlet of the wastewater stripping tower (1) and the feed / discharge heat exchanger (7); the concentrated water recycling system consists of a cooler (8), a reflux tank (3), and a concentrated water reflux pump (11). The shell-side inlet of the cooler (8) is connected to the top outlet of the wastewater stripping tower (1), and circulating water flows through the tube side of the cooler (8); the shell-side outlet of the cooler (8) is connected to the bottom outlet of the wastewater stripping tower (1). The reflux tank (3) is connected, the top outlet of the reflux tank (3) is connected to the reactor, and the bottom outlet of the reflux tank (3) is connected to the inlet of the concentrated water reflux pump (11); the concentrated water treatment system consists of a concentrated water storage tank (5), a mixed oil tank (6), and a mixed oil external pump (12); a heating coil (14) is installed inside the concentrated water storage tank (5), using saturated steam as a heat source; the top outlet of the concentrated water storage tank (5) is connected to a thermal incinerator, and the concentrated water storage tank... The bottom outlet of (5) is connected to the front end of the water mixing tank (2) via the concentrated water refining pump (13) to form a concentrated water refining pipeline; the side outlet of the concentrated water storage tank (5) is connected to the top inlet of the mixed oil tank (6), and the bottom outlet of the mixed oil tank (6) is connected to the mixed oil delivery pump (12); the outlet of the concentrated water return pump (11) is divided into two branches, one branch is connected to the concentrated water storage tank (5), and the other branch is connected to the upper side of the sewage stripping tower (1).

2. The concentrated water treatment apparatus for methanol-to-olefins as described in claim 1, characterized in that: The oily washing water at 85-95℃ from the water washing tower enters the water mixing tank (2), and is then pressurized to 1.0MPa by the sewage feed pump (9) before being sent to the feed heat exchanger (7). After heat exchange to 95-110℃, it enters the sewage stripping tower (1) from the middle of the side. Part of the bottom water discharged from the bottom outlet of the sewage stripping tower (1) enters the shell side of the reboiler (4), and is heated to 130-140℃ after countercurrent heat exchange with saturated steam at 1.0MPa, becoming a gas-liquid mixture. Then it returns to the sewage stripping tower (1) from the lower side to form rising steam. The steam and the oily washing water in the sewage stripping tower (1) undergo mass and heat transfer. Methanol, dimethyl ether and aldehydes and ketones in the oily washing water are evaporated and carried by the rising steam to the top of the sewage stripping tower (1) to form the top gas. The tower pressure of the sewage stripping tower (1) is controlled at 0.15 to 0.25 MPa. Another part of the bottom water discharged from the bottom outlet of the sewage stripping tower (1) is pressurized by the purified water pump (10) and sent to the feed heat exchanger (7). After exchanging heat with the oily washing water from the water mixing tank (2), the bottom water at 95 to 110°C is sent to the public works for treatment.

3. The concentrated water treatment device for methanol-to-olefins as described in claim 2, characterized in that: The circulating water at 25°C in the tube side of the cooler (8) cools the top gas from the top outlet of the wastewater stripping tower (1) to 95-100°C and then enters the reflux tank (3) for gas-liquid separation. The non-condensable gas obtained in the reflux tank (3) is sent to the reactor for reprocessing through the top outlet of the reflux tank (3). The concentrated water obtained in the reflux tank (3) is sent to the concentrated water reflux pump (11) through the bottom outlet of the reflux tank (3). The outlet of the concentrated water reflux pump (11) is divided into two branches. The concentrated water from one branch is sent to the upper part of the wastewater stripping tower (1) for reflux to establish the tray liquid level for mass and heat transfer. The concentrated water from the other branch is sent to the concentrated water storage tank (5).

4. A concentrated water treatment device for methanol-to-olefins as described in claim 3, characterized in that: Saturated steam at 1.0 MPa heats the concentrated water in the concentrated water storage tank (5) to 60-70°C. At this temperature, the oil in the concentrated water will accelerate stratification and accumulate at the top of the concentrated water storage tank (5). Some aldehydes and ketones in the concentrated water will volatilize and be sent to the regenerative incinerator for combustion through the top outlet of the concentrated water storage tank (5). The concentrated water processed by the concentrated water storage tank (5) is discharged from the bottom outlet of the concentrated water storage tank (5), and after being pressurized by the concentrated water return pump (13), it enters the water mixing tank (2) together with the oily washing water washed down from the water washing tower. The oil that accumulates at the top of the concentrated water storage tank (5) is sent to the oil tank (6), and after being pressurized by the oil delivery pump (12), it is loaded onto trucks and sent out.

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