An mto settling tank system

Abstract

The application provides an MTO settling tank system, an inlet area, a settling area and an outlet area are formed in the settling tank by a separation component, the inlet area is communicated with the settling area through a first communicating hole, the settling area is communicated with the outlet area through a second communicating hole, a sewage pipeline is communicated with the inlet area, a sewage treatment component is connected with the outlet area, and a collecting component is connected with the settling area. The separation component comprises a bottom plate and a baffle, the bottom plate is installed in the inside of the settling tank and separates the settling tank into two parts, one part is the settling area, the first communicating hole and the second communicating hole are both installed on the bottom plate, and the baffle separates the other part of the settling tank into the inlet area and the outlet area. The aperture of the first communicating hole is larger than that of the second communicating hole. The purpose is to reduce the content of fixed catalyst in purified water and improve the settling efficiency of the MTO settling tank.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of methanol to olefins, and particularly relates to an MTO settling tank system. BACKGROUND

[0002] The organic matter-containing sewage from an MTO device and an olefin separation device enters a settling tank, sewage in the settling tank is pressurized by a sewage stripping tower feed pump, then is heated by a sewage stripping tower feed heat exchanger, and then enters the sewage stripping tower, and qualified purified water is obtained through stripping by the sewage stripping tower. The MTO device sewage stripping tower is provided with 40-60 layers of float valves or fixed trays, and is provided with a stripping gas cooler tower top reflux tank, and has two sewage stripping tower bottom reboilers at the bottom, which use low-pressure superheated steam as a heat source to strip trace amounts of methanol, dimethyl ether and other oxygen-containing compounds in the sewage into the reactor for recycling. The obtained purified water is pressurized by a pump, then is cooled to 40-70 DEG C by a purified water dry air cooler after being cooled by a sewage stripping tower feed heat exchanger and a methanol-purified water heat exchanger (I), and is then divided into three paths, one of which is sent to an olefin separation device water washing tower to wash reaction gas, one of which is directly sent to a quenching / water washing tower, and the other of which is sent to a methanol-purified water heat exchanger (II) to finely adjust the methanol feed temperature. The purified water is cooled to 30-50 DEG C by a purified water cooler after being heated by the purified water heat exchanger, and is then sent to a water treatment device. The sewage stripping tower top stripping gas is heated by a methanol-stripping gas heat exchanger, and then is cooled by a sewage stripping tower top gas cooler, and then enters the sewage stripping tower top reflux tank. Concentrated water (containing methanol or dimethyl ether) is pressurized by a sewage stripping tower top reflux pump, and is then divided into two paths, one of which is returned to the sewage stripping tower as reflux, and the other of which is sent to a concentrated water tank. The concentrated water is pressurized by a concentrated water pump, and then is sent to a concentrated water oil remover to remove an oil phase. The oil phase of the concentrated water oil remover is sent to an oil-containing wastewater tank through a coalescer top, and the water phase from the bottom of the oil remover is vaporized by a steam-concentrated water heat exchanger, and then is sent to the reactor for recycling.

[0003] At present, the sewage stripping tower of the MTO device is prone to blockage during operation. The blockage is caused by a large amount of solid catalyst carried in the sewage, and the purified water after purification by the sewage stripping tower also contains a large amount of solid catalyst, which causes related equipment to be unable to operate for a long period. SUMMARY

[0004] In view of the above problems, the application provides an MTO settling tank system, which aims to reduce the content of fixed catalyst in purified water and improve the settling efficiency of the MTO settling tank.

[0005] The technical scheme adopted by the application is as follows.

[0006] The application discloses an MTO settling tank system, wherein an inlet area, a settling area and an outlet area are formed in the settling tank by a partition assembly; the inlet area is communicated with the settling area through a first communicating hole; the settling area is communicated with the outlet area through a second communicating hole; a sewage pipeline is communicated with the inlet area; a sewage treatment assembly is connected to the outlet area; and a collecting assembly is connected to the settling area.

[0007] Further, the partition assembly comprises a bottom plate and a baffle plate; the bottom plate is installed in the settling tank to divide the settling tank into two parts, one part being the settling area; the first communicating hole and the second communicating hole are both installed on the bottom plate; and the baffle plate divides the other part of the settling tank into the inlet area and the outlet area.

[0008] Further, the first communicating hole has a larger hole diameter than the second communicating hole.

[0009] Further, the collecting assembly comprises a collecting tank, wherein a buffer assembly for separating solid catalysts is arranged in the collecting tank to divide the collected substances in the collecting tank into sewage and sludge; a sludge tank outlet is arranged at one end of the sludge; a collecting pump is communicated with one end of the sewage; the collecting pump is communicated with the pipeline of the sewage pipeline of the settling tank through a pipeline; and the suction outlet of the collecting pump is arranged at 40-60% of the total height of the collecting tank.

[0010] Further, the buffer assembly comprises an inclined flushing plate, a collecting groove is arranged at the lower side of the flushing plate, a plurality of inclined buffer plates are arranged at the higher side of the flushing plate, the buffer plates are arranged in the same direction as the flushing plate, and a support frame is arranged at the bottom of the flushing plate to enhance the strength of the flushing plate.

[0011] Further, a collecting tank liquid level meter is arranged on the side of one end of the collecting tank where the collecting pump is arranged.

[0012] Further, the sewage treatment assembly comprises a settling tank liquid level meter arranged on the side wall of the outlet area of the settling tank, a sewage pump is communicated with the settling tank liquid level meter, and a filter is connected to the end of the sewage pump away from the settling tank liquid level meter.

[0013] Further, the total height of the settling tank liquid level meter accounts for 40-60% of the total height of the settling tank, the suction outlet of the sewage pump is arranged at 40-50% of the total height of the settling tank liquid level meter, and the solid catalysts contained in the sewage entering the sewage pump are as little as possible.

[0014] Further, 2-4 filters are arranged to control the solid catalysts in the sewage to be less than or equal to 2 ppm.

[0015] As described above, the application has the following beneficial effects due to the adoption of the above technical scheme.

[0016] The sewage enters the sedimentation tank from the sewage pipeline, is separated by the baffle, is in the inlet area, flows to the sedimentation area through the first communication hole, the first communication hole buffers the sewage, and then enters the sedimentation area, the sewage is settled in the sedimentation area, most of the solid catalyst is settled and filtered in the sedimentation area, and the sewage settled with the solid catalyst flows to the outlet area and is screened through the second communication hole, further separates the solid catalyst, and is subsequently treated by the sewage treatment assembly at the outlet area. The bottom plate and the baffle are separated, the sewage scouring intensity can be effectively buffered, the turbidity of the sewage is reduced, and most of the solid catalyst is settled and filtered. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0018] Figure 1 The overall structural diagram of the embodiment of the present application is shown in the figure.

[0019] Figure 2 The bottom plate is shown in the figure.

[0020] Figure 3 The buffer assembly structure diagram is shown in the figure.

[0021] Figure 4 The buffer plate structure diagram is shown in the figure.

[0022] BRIEF DESCRIPTION OF DRAWINGS: 1-sewage pipeline, 2-sedimentation tank, 3-baffle, 4-sedimentation tank liquid level meter, 5-collection tank, 6-collection pump, 7-collection tank liquid level meter, 8-sludge tank loading port, 9-sewage pump, 10-filter, 101-bottom plate, 102-inlet plate, 103-outlet plate, 104-supporting member, 105-separation plate, 201-buffer plate, 202-scouring plate, 203-supporting frame, 204-collection groove, 301-solid plate, 302-support, 303-overflow port. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application claimed, but merely represents selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the application.

[0025] The application will be described in detail below with reference to the accompanying drawings. Figures 1-4 The application will be described in detail below with reference to the accompanying drawings. Embodiments

[0026] An MTO settling tank system, comprising a settling tank 2, a bottom plate 101 horizontally arranged at the bottom of the settling tank 2, the bottom plate 101 being composed of an inlet plate 102 and an outlet plate 103, the inlet plate 102 and the outlet plate 103 being separated by a partition plate 105, a plurality of first communication holes being arranged on the inlet plate 102, a plurality of second communication holes being arranged on the outlet plate 103, the diameter of the first communication holes being larger than that of the second communication holes. A baffle plate 3 is installed on the bottom plate 101, the baffle plate 3 being located on the partition plate 105, i.e. the baffle plate 3 separates the first communication holes and the second communication holes, and a support 104 is installed on the bottom plate 101 for reinforcing the strength of the bottom plate 101. The settling tank 2 is divided into three areas by the bottom plate 101 and the baffle plate 3, including an inlet area connected to a sewage pipeline 1, an outlet area connected to a sewage outlet and a sewage treatment assembly, and a settling area separated by the bottom plate 101. By adding the bottom plate 101 to the settling tank 2, the sewage from the sewage pipeline 1 enters the settling tank 2, is separated by the baffle plate 3, and is in the inlet area, flows to the settling area through the first communication holes, and is buffered by the first communication holes, then enters the settling area, and is settled in the settling area, most of the solid catalyst being settled and filtered in the settling area, and the sewage settled with the solid catalyst passing through the second communication holes for further separation of the solid catalyst during the process of flowing to the outlet area, and being further treated by the sewage treatment assembly in the outlet area. The separation by the bottom plate 101 and the baffle plate 3 can effectively buffer the scouring force of the sewage, reduce the turbidity of the sewage, and settle and filter most of the solid catalyst.

[0027] The sewage treatment assembly comprises a sedimentation tank liquid level gauge 4 installed on the side wall of the outlet area of the sedimentation tank 2, a sewage pump 9 is communicated with the sedimentation tank liquid level gauge 4, and a filter 10 is connected to the end of the sewage pump 9 away from the sedimentation tank liquid level gauge 4. The position of the sedimentation tank liquid level gauge 4 is set at the position of 60% of the height of the sedimentation tank 2, and the position of the pumping outlet of the sewage pump 9 is set at the position of 50% of the total height of the sedimentation tank 2 liquid level gauge. Compared with the current sewage treatment assembly of the sedimentation tank 2, by increasing the height of the bottom of the liquid level gauge and the height of the pumping outlet, it is ensured that the sewage entering the sewage pump 9 contains as little solid catalyst as possible, the sedimentation space is large, the sedimentation time is long, and the sedimentation effect is better. The filter is set to 2-4, and the remaining solid catalyst contained in the sewage is filtered out, so that the solid catalyst in the sewage is controlled to be ≤2ppm.

[0028] Further, the bottom of the sedimentation tank 2 is communicated with a collection assembly, the collection assembly comprises a collection tank 5, a buffer assembly for separating solid catalysts is arranged in the collection tank 5, the collected substances in the collection tank 5 are further separated into sewage and sludge, one end where the sludge is located is provided with a sludge tank loading port 8, one end where the sewage is located is communicated with a collection pump 6, the collection pump 6 is communicated back to the pipeline where the sewage pipeline 1 of the sedimentation tank 2 is located through a pipeline, and the pumping outlet of the collection pump 6 is arranged at the position of 60% of the total height of the collection tank 5. The height of the pumping outlet of the collection pump 6 is increased, so that the collection pump 6 can transport sewage containing less solid catalyst, the sedimentation tank 2 to the collection tank 5 is discharged once every 4-12 hours, the collection pump 6 is started once every 2-7 days, the sludge is loaded once every 5-15 days, the sedimentation time of the collection tank 5 is long, and the solid-liquid sedimentation separation effect is obvious. The collection pump 6 can pump out the clarified liquid in the collection tank 5 and send it to the sedimentation tank 2 to recover organic matter, reduce the process of sending sewage to the boundary area and then returning to the sedimentation tank 2, save investment cost, reduce energy consumption, and reduce operation cost.

[0029] The buffer assembly comprises an inclined flushing plate 202, the lower side of the flushing plate 202 is provided with a collection groove 204, the higher side of the flushing plate 202 is provided with a plurality of inclined buffer plates 201, the buffer plates 201 and the flushing plate 202 are inclined in the same direction, and a support frame 203 is installed at the bottom of the flushing plate 202 to strengthen the strength of the flushing plate 202. The buffer plate 201 buffers the large fluctuation of water and solid catalyst, and reduces the turbidity of the sewage; the flushing plate 202 reduces the scouring force of the sewage on the bottom of the collection tank 5, the flushing plate 202 is made of thick steel material; the support frame 203 supports the flushing plate 202 and plays a reinforcing role; and the collection groove 204 collects the solid catalyst settled in the sewage. Secondly, the upper part of the buffer plate 201 is a solid plate 301, the lower part is an overflow port 303, the buffer plate 201 is provided with a support 302, the solid plate 301 plays a buffering role, and the overflow port 303 is beneficial to the settlement of the solid catalyst into the collection groove 204.

[0030] The collecting groove 204 is provided with a sludge outlet 8, and the sludge is recycled by loading, instead of entering the sewage tank, so as to reduce the labor intensity and production cost of cleaning the sludge in the sewage tank.

[0031] The above only is the preferred embodiment of the present application, and is not used to limit the present application, for the person skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An MTO settler tank system characterized by: The settling tank (2) is divided into an inlet area, a settling area and an outlet area by a partition assembly. The inlet area is communicated with the settling area through a first communication hole, and the settling area is communicated with the outlet area through a second communication hole. A sewage pipeline (1) is communicated with the inlet area, a sewage treatment assembly is connected to the outlet area, and a collecting assembly is connected to the settling area. The partition assembly includes a bottom plate (101) and a baffle (3). The bottom plate (101) is installed inside the settling tank (2) to divide the settling tank (2) into two parts. One part is the settling area, and the first communication hole and the second communication hole are both installed on the bottom plate (101). The baffle (3) divides the other part of the settling tank (2) into the inlet area and the outlet area. The aperture of the first communication hole is larger than that of the second communication hole. The collecting assembly includes a collecting tank (5) in which a buffer assembly for separating solid catalysts is arranged to separate the collected materials in the collecting tank (5) into sewage and sludge. A sludge tank outlet (8) is arranged at one end of the sludge. A collecting pump (6) is communicated with the pipeline in which the sewage pipeline (1) is arranged on the settling tank (2). The suction port of the collecting pump (6) is arranged at 40-60% of the total height of the collecting tank (5). The sewage treatment assembly includes a settling tank level meter (4) installed on the side wall of the outlet area of the settling tank (2). A sewage pump (9) is communicated with the settling tank (2). A filter (10) is connected to the end of the sewage pump (9) away from the settling tank level meter (4). The total height of the settling tank level meter (4) accounts for 40-60% of the total height of the settling tank (2). The suction port of the sewage pump (9) is arranged at 40-50% of the total height of the settling tank level meter (4) to ensure that the sewage entering the sewage pump (9) contains as little solid catalyst as possible.

2. An MTO settling tank system according to claim 1, characterized in that: The buffer assembly includes an inclined flushing plate (202). The lower side of the flushing plate (202) is provided with a collecting groove (204). The higher side of the flushing plate (202) is provided with a plurality of inclined buffer plates (201). The buffer plates (201) are inclined in the same direction as the flushing plate (202). The bottom of the flushing plate (202) is provided with a support frame (203) for strengthening the strength of the flushing plate (202).

3. The MTO settling tank system of claim 1, wherein: A collecting tank level meter (7) is installed on the side of the collecting pump (6) on one end of the collecting tank (5).

4. The MTO settling tank system of claim 1, wherein: The filter (10) is provided with 2-4 filters. The content of solid catalyst in the sewage is controlled to be ≤2 ppm.

Images