A water treatment method and water treatment system for purification of methanol to olefins product gas

Abstract

The present invention provides a water treatment method and a water treatment system for purification of methanol-to-olefin product gas, which can effectively remove particulate matter and oily wax-like organic matter in the quenched water turbidity generated in the product gas purification process. The water treatment method comprises: sending the product gas into a quenching tower for washing and cooling with quenching water to obtain quenched product gas and quenched water turbidity; sending the quenched product gas into a water washing tower for washing and cooling again to obtain washed product gas and washed water turbidity; circulating part of the washed water turbidity to the water washing tower, sending part of the washed water turbidity to the quenching tower; sending the quenched water turbidity to a microchannel separator for treatment to remove particulate matter and part of organic matter in the quenched water turbidity to obtain quenched water clear liquid; sending part of the quenched water clear liquid to the quenching tower, sending part of the quenched water clear liquid to the water washing tower; sending part of the quenched water clear liquid and part of the washed water turbidity to a sewage stripping tower for treatment.

Description

Technical Field

[0001] The invention relates to a treatment technology for quench water and washing water in a purification process of methanol to olefins product gas, and in particular to a water treatment method and a water treatment system in the purification of methanol to olefins product gas. Background Art

[0002] Methanol to Olefins, referred to as MTO (Methanol to Olefins), refers to the process of preparing low-carbon olefins through catalytic reaction using methanol as raw material. The reaction is generally achieved through a fluidized bed reactor, and the catalyst currently used is SAPO-34 molecular sieve. Some catalyst particles will be entrained in the reaction product gas, and the catalyst is currently recovered through a three-stage or four-stage cyclone separator. The product gas recovered by the catalyst is then sent to the quench tower for washing and cooling. Limited by the separation accuracy of the cyclone separator, the product gas after catalyst recovery also contains a small amount of micro-catalyst fine powder with a particle size of less than 10μm or less than 5μm. After washing in the quench tower, most of it remains in the quench water, and a small amount goes to the subsequent water washing tower with the product gas. In order to ensure the normal operation of the water system, it is necessary to effectively remove particulate matter in the quench water. Because the methanol to olefin reaction will produce some hydrocarbon by-products, the by-products and unreacted methanol and intermediate products such as dimethyl ether and other oxygen-containing compounds are sent to the water washing tower with the product gas for washing, cooling and washing away the oily waxy organic matter and oxygen-containing compounds condensed in the product gas. If the oily wax organic matter in the wash water system cannot be effectively separated, it will condense at the low temperature of the system and carry catalyst fine powder, causing the system heat exchanger and air cooler to be blocked, resulting in reduced heat exchange effect and other problems; therefore, the existing technology requires continuous discharge of wash water and frequent maintenance and cleaning of heat exchange equipment. However, the continuous discharge of quench water and wash water causes the load of the sewage stripping tower to increase, which puts great pressure on the normal operation of the sewage stripping tower, and also increases the maintenance cost of the MTO unit. Frequent cleaning also brings great safety risks to on-site maintenance operations.

[0003] At present, the blockage problem of the quench water-wash water system and heat exchanger of the MTO units of many domestic companies has become one of the bottlenecks affecting the long-term stable operation of the methanol to olefins unit. At present, some MTO units adopt the continuous injection of C5 or even intermittent injection of xylene and other organic substances into the wash water system to improve the above problems. Although the introduction of these reagents will dissolve the wax in the system, it will increase the COD of the wash water to a certain extent, increase the load of the sewage stripping tower and the sewage treatment system, and increase the raw material cost and technical cost. Therefore, it is urgent to develop an efficient and reliable MTO water system deep purification technology.

[0004] Chinese invention patent application CN101352621A discloses a method and device for cyclone desolidification of MTO quench water and wash water, Chinese invention patent application CN 101352620A discloses a method and device for micro-cyclone concentration of fine catalyst in MTO quench water and wash water, and Chinese invention patent CN 102093153B discloses a method and device for optimized combination purification and separation of MTO catalyst-containing micropowder reaction gas. The above technologies all use multi-stage hydrocyclones to purify and concentrate the catalyst in quench water and wash water, but due to the separation characteristics of the hydrocyclones themselves, the concentration multiples of catalysts below 2.5 μm are insufficient.

[0005] Chinese invention patent application CN 104649446A discloses a liquid-solid separation method and device for MTO quench water and wash water, in which precision filtration is used to separate and concentrate the quench water catalyst. However, in actual operation, due to the small particle size of the particles in the water and the small amount of oil wax, the particles and oil wax easily enter the filter element pores, causing pore blockage, and it is difficult to remove them through online backwashing, resulting in insufficient filter processing capacity, excessive pressure difference, and difficulty in normal use of the equipment.

[0006] Chinese utility model patent application CN205031975U discloses a MTO quench water and wash water purification treatment device, which uses microporous filter elements to filter and adds effective gas backwashing and chemical cleaning methods to achieve cleaning and regeneration of the filter elements. However, the backwashing process of this system is complicated and time-consuming, and the equipment investment is large and the operating cost is high.

[0007] Chinese invention patent application CN 103951098B discloses a method and device for desolidifying and removing oil from quench water and wash water in a methanol to olefins process. The method separates the quench water catalyst through an ultrafiltration membrane. The method has a good separation effect, but the equipment has high energy consumption and high operating costs, and the ultrafiltration membrane is easily blocked by oil wax. It is not suitable for occasions such as MTO quench water with large processing volume and complex components.

[0008] Chinese invention patent application CN107382654A discloses a method and device for separating methanol-to-olefins quench water in an ebullating bed, and Chinese invention patent application CN108328761A discloses a method and device for extending the continuous operation cycle of an MTO wash water process. Both use an ebullating bed separation technology to treat methanol-to-olefins quench water and wash water. This method has excellent separation effect, long operation cycle, low cost and energy consumption, but the quench water circulation system and the wash water circulation system each require a set of filters for treatment, and the system is relatively complex. Summary of the invention

[0009] In view of this, the present invention provides a novel water treatment method and water treatment system for methanol to olefin product gas purification, which can effectively remove particulate matter and oily waxy organic matter in the quench water turbid liquid generated in the product gas purification process, reduce equipment blockage, and extend the equipment operation cycle. The purification and separation process does not require complicated and cumbersome filtering equipment and processing procedures, which is conducive to reducing investment costs and energy consumption.

[0010] To achieve the purpose, the present invention provides the following technical solutions:

[0011] The present invention provides a method for treating water in the purification of methanol to olefins product gas, comprising:

[0012] The product gas produced from the methanol to olefins process is sent to a quench tower to be washed and cooled with quench water to obtain quenched product gas and quench water turbid liquid;

[0013] The quenched product gas is sent to a water washing tower to be washed again and cooled with washing water to obtain washed product gas and washing water turbidity;

[0014] Circulating part of the turbid washing water to the washing tower for use as the washing water, and sending part of the turbid washing water to the quenching tower for use as the quenching water;

[0015] The quenched water turbid liquid is sent to a microchannel separator for treatment to remove particulate matter and part of organic matter in the quenched water turbid liquid to obtain a quenched water clear liquid;

[0016] Sending part of the quenching water clear liquid into the quenching tower for use as the quenching water, and sending part of the quenching water clear liquid into the water washing tower for use as the water washing water;

[0017] Part of the quench water clear liquid and part of the washing water turbid liquid are sent to a sewage stripping tower for treatment to obtain purified water.

[0018] In a preferred embodiment, the microchannel separator comprises a tower body, wherein the tower body is provided with a feed channel for introducing the quenched water turbid liquid, a clear liquid receiving chamber for receiving the quenched water clear liquid, and a filter material filling area for filling the filter material;

[0019] The feed channel comprises a liquid outlet section inserted into the filter material filling area, and the liquid outlet section is provided with a plurality of liquid outlet holes communicated with the filter material filling area at intervals along its axial direction;

[0020] The filter material filling area is located between the liquid outlet section of the feed channel and the clear liquid containing chamber, and the clear liquid containing chamber is provided with a water inlet hole communicating with the filter material filling area;

[0021] The clear liquid containing chamber is provided with a water outlet hole for outputting the quenching water clear liquid.

[0022] In a preferred embodiment, the microchannel separator further comprises a cyclone, the cyclone comprising a cylindrical body and a conical body connected to the bottom of the cylindrical body, the side wall of the cylindrical body is provided with a material inlet, the top of the cylindrical body is provided with a material outlet, and the bottom of the conical body is provided with a regenerated filter material outlet;

[0023] The tower body is provided with an overflow port communicating with the filter material filling area and a regenerated filter material inlet, the overflow port is communicated with the feed inlet of the cyclone, and the regenerated filter material inlet is communicated with the regenerated filter material outlet of the cyclone.

[0024] In a preferred embodiment, the tower body is provided with a backwash inlet for introducing regeneration gas and backwash liquid into the filter material filling area; the method further comprises:

[0025] When the filter material in the microchannel separator needs to be regenerated, the quenching water turbid liquid is stopped from being fed into the microchannel separator for which the filter material needs to be regenerated, and the regeneration gas and the backwashing liquid are introduced into the filter material filling area of ​​the microchannel separator through the backwashing inlet to backwash the filter material in the filter material filling area and make the filter material filling area form a boiling state;

[0026] The backwash liquid carries the filter material into the cyclone from the overflow port, and removes the particulate matter and organic matter from the quench water turbid liquid attached to the filter material to obtain regenerated filter material. The regenerated filter material flows back from the regenerated filter material outlet to the filter material filling area, and the removed particulate matter and organic matter are discharged from the discharge port.

[0027] In a preferred embodiment, a plurality of said microchannel separators are used in parallel in said method;

[0028] The turbid washing water used as the washing water and the clear quenching water used as the washing water are cooled by a heat exchanger and an air cooler and then sent to the washing tower for use;

[0029] The clear quench water used as the quench water is cooled by a heat exchanger and an air cooler and then sent to the quench tower for use.

[0030] The present invention also provides a water treatment system for purifying methanol-to-olefin product gas, the water treatment system comprising a quenching tower, a water washing tower, a microchannel separator and a sewage stripping tower;

[0031] The quench tower is used to wash and cool the product gas generated from the methanol to olefins process using quench water to obtain quenched product gas and quench water turbid liquid;

[0032] The water washing tower is connected to the quenching tower, and the water washing tower is used to use washing water to wash and cool the quenched product gas again to obtain washed product gas and washing water turbidity;

[0033] The water washing tower is provided with a water washing liquid circulation pipeline for circulating part of the water washing liquid into the water washing tower for use as the water washing water;

[0034] A washing water turbid liquid introduction pipeline is connected between the washing tower and the quenching tower, for introducing part of the washing water turbid liquid from the washing tower into the quenching tower for use as the quenching water;

[0035] The microchannel separator is in communication with the quench tower, and is used to receive the quench water turbidity liquid from the quench tower and remove particulate matter and part of organic matter in the quench water turbidity liquid to obtain quench water clear liquid;

[0036] The microchannel separator is provided with a quenching water clear liquid outlet, and the quenching water clear liquid outlet is respectively connected to the water washing tower and the quenching tower, so that part of the quenching water clear liquid is used as the washing water and the quenching water respectively;

[0037] The sewage stripping tower is communicated with the water washing tower and the microchannel separator respectively, and is used for receiving and treating part of the turbid washing water and part of the clear cooling water to obtain purified water.

[0038] In a preferred embodiment, the microchannel separator comprises a tower body, wherein the tower body is provided with a feed channel for introducing the quenched water turbid liquid, a clear liquid receiving chamber for receiving the quenched water clear liquid, and a filter material filling area for filling the filter material;

[0039] The feed channel comprises a liquid outlet section inserted into the filter material filling area, and the liquid outlet section is provided with a plurality of liquid outlet holes communicated with the filter material filling area at intervals along its axial direction;

[0040] The filter material filling area is located between the liquid outlet section of the feed channel and the clear liquid containing chamber, and the clear liquid containing chamber is provided with a water inlet hole communicating with the filter material filling area;

[0041] The clear liquid containing chamber is provided with a water outlet hole for outputting the quenching water clear liquid.

[0042] In a preferred embodiment, the microchannel separator further comprises a cyclone, the cyclone comprising a cylindrical body and a conical body connected to the bottom of the cylindrical body, the side wall of the cylindrical body is provided with a material inlet, the top of the cylindrical body is provided with a material outlet, and the bottom of the conical body is provided with a regenerated filter material outlet;

[0043] The tower body is provided with an overflow port communicating with the filter material filling area and a regenerated filter material inlet, the overflow port is communicated with the feed inlet of the cyclone, and the regenerated filter material inlet is communicated with the regenerated filter material outlet of the cyclone.

[0044] In a preferred embodiment, the tower body is provided with a backwash inlet for introducing regeneration gas and backwash liquid into the filter material filling area;

[0045] Preferably, the backwash inlet is arranged below the filter material filling area;

[0046] Preferably, a distributor acting on the regeneration gas and the backwash liquid is provided at the bottom of the filter material filling area, and the backwash inlet is connected to the distributor.

[0047] In some embodiments, the microchannel separator is provided in plurality, and the plurality of microchannel separators are connected in parallel;

[0048] A first quenching water clear liquid introduction pipeline for introducing part of the quenching water clear liquid into the quenching tower is connected between the microchannel separator and the quenching tower, and a heat exchanger and an air cooler are arranged on the first quenching water clear liquid introduction pipeline;

[0049] The water washing tower is connected to a water washing water inlet pipeline for introducing turbid washing water and quenching clear water used as washing water into the water washing tower, and a heat exchanger and an air cooler are arranged on the water washing water inlet pipeline.

[0050] The technical solution provided by the present invention has the following beneficial effects:

[0051] In the method of the present invention, part of the turbid washing water produced in the water washing tower is sent to the quenching tower, used as quenching water in the quenching tower and then enters the quenching water turbid liquid, and then sent to the downstream microchannel separator to remove catalyst particles and oily waxy organic matter in one step, and the obtained quenching water clear liquid is divided into multiple streams, one stream is used as washing water in the water washing tower together with part of the turbid washing water, one stream is used as quenching water of the quenching tower, and one stream is used to enter the sewage stripping tower together with part of the turbid washing water for stripping purification. Through the above method, on the one hand, the content of catalyst particles and oily waxy organic matter in the washing water entering the water washing tower can be reduced, and the blockage of the washing water circulation pipeline, centrifugal pump and heat exchange equipment can be reduced; on the other hand, the content of catalyst particles and oily waxy organic matter in the water entering the sewage stripping tower can be reduced, the blockage of the sewage stripping tower can be reduced, and the difficulty of treating the sewage stripping tower can be reduced; on the other hand, the above method can be used in the entire process operation process to reduce the blockage of equipment (such as towers, centrifugal pumps, heat exchange equipment, pipelines, etc. used in various links), reduce the frequency of shutdown for cleaning, and help improve the equipment operation stability and delay the operation cycle. In addition, the required process flow is simplified, there is no need to add multiple filtering equipment, low energy consumption, and low maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 A schematic diagram of a process flow of a water treatment method in methanol-to-olefins product gas purification in one embodiment;

[0053] Figure 2 A schematic diagram of the structure of a microchannel separator in one embodiment;

[0054] Figure 3 A schematic diagram of a plurality of microchannel separators arranged in parallel in one embodiment. DETAILED DESCRIPTION

[0055] In order to facilitate the understanding of the present invention, the present invention will be further described below in conjunction with examples. It should be understood that the following examples are only for a better understanding of the present invention and do not mean that the present invention is limited to the following examples.

[0056] Where specific experimental steps or conditions are not specified in the examples, the corresponding conventional experimental steps or conditions in the art can be used. The reagents or instruments used without specifying the manufacturer are all conventional products that can be purchased commercially.

[0057] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to their different positions and different usage conditions. The words "inside" and "outside" refer to the direction toward or away from the geometric center of a specific component, respectively. In addition, the terms "first", "second", "third", etc. that may be mentioned are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0058] The present invention provides a water treatment method for purifying methanol-to-olefins product gas, which mainly comprises:

[0059] The product gas generated from the methanol to olefins process is sent to a quench tower 5, where the product gas is washed and cooled with quench water. During the washing and cooling of the product gas by the quench water, the micro-nano catalyst fine powder entrained in the product gas is washed into the quench water to obtain the quenched product gas and the quench water turbid liquid;

[0060] The quenched product gas is sent to a water washing tower 4, where it is washed and cooled again with washing water to wash away the remaining catalyst fine powder and condensed organic matter (forming waxy organic matter) in the product gas, thereby obtaining a washed product gas and a washed water turbid liquid;

[0061] Part of the turbid water washing liquid obtained in the water washing tower 4 is circulated to the water washing tower 4 and reused as washing water, and part of the turbid water washing liquid is sent to the quenching tower 5 and used as quenching water;

[0062] The quenched water turbid liquid obtained in the quenching tower 5 is sent to the microchannel separator 3 for treatment, so as to remove the particulate matter and part of the organic matter (mainly oily wax-like organic matter) in the quenched water turbid liquid to obtain a quenched water clear liquid;

[0063] Part of the quenching water is sent to the quenching tower 5 for use as quenching water, and part of the quenching water is sent to the water washing tower 4 for use as washing water;

[0064] Part of the quench water clear liquid and part of the washing water turbid liquid are sent to the sewage stripping tower 6 for treatment, and the organic matter therein is stripped to obtain purified water.

[0065] For details, see Figure 1The washing water turbidity obtained in the washing tower 4 is pressurized and output by a centrifugal pump, a part of which is pumped to the washing tower 4 as washing water and to the quenching tower 5 as quenching water by a centrifugal pump 12, and a part of which is pumped to the sewage stripping tower 6 by a centrifugal pump 13. The quenching water turbidity obtained in the quenching tower 5 is pressurized and output by a centrifugal pump 14 and sent to the microchannel separator 3; the quenching water clear liquid obtained in the microchannel separator 3 is pressurized and output by a centrifugal pump 15 and sent to the washing tower 4, the quenching tower 5 and the sewage stripping tower 6 respectively.

[0066] In the method of the present invention, part of the washing water turbidity generated in the washing tower 4 is sent to the quenching tower 5, used as quenching water in the quenching tower 5, and then enters the quenching water turbidity, and then sent to the downstream microchannel separator 3 to remove catalyst particles and oily waxy organic matter in one step, and the obtained quenching water clear liquid is divided into multiple streams, one stream is used as washing water in the washing tower 4 together with part of the washing water turbidity, one stream is used as quenching water of the quenching tower 5, and one stream is used to enter the sewage stripping tower 6 for stripping purification together with part of the washing water turbidity. Through the above method, on the one hand, the content of catalyst particles and oily waxy organic matter in the washing water entering the washing tower 4 can be reduced, and the blockage of the washing water circulation pipeline, centrifugal pump and heat exchange equipment can be reduced; on the one hand, the content of catalyst particles and oily waxy organic matter in the water entering the sewage stripping tower 6 can be reduced, the blockage of the sewage stripping tower 6 can be reduced, and the treatment difficulty of the sewage stripping tower 6 can be reduced; on the other hand, the above method can be used to greatly reduce the blockage of equipment (such as towers, centrifugal pumps, heat exchange equipment, pipelines, etc. used in each link) during the entire process operation, reduce the frequency of shutdown for cleaning, and help improve the equipment operation stability and delay the operation cycle. In addition, the required process flow is simplified, and there is no need to add multiple filtering equipment, low energy consumption, and low maintenance costs.

[0067] In a preferred embodiment, see Figure 2The microchannel separator 3 used includes a tower body 40, which is provided with a feed channel 41 for introducing turbid liquid of quenched water, a clear liquid containing chamber 44 for containing clear liquid of quenched water, and a filter material filling area 45 for filling filter material. Among them, the feed channel 41 includes a liquid outlet section 42 inserted into the filter material filling area 45, and the entire liquid outlet section 42 is in a state of being inserted into the filter material filling area 45. The liquid outlet section 42 is provided with a plurality of liquid outlet holes (not shown in the figure) connected with the filter material filling area 45 at intervals along its axial direction; the filter material filling area 45 is located between the liquid outlet section 42 of the feed channel 41 and the clear liquid containing chamber 44, and the clear liquid containing chamber 44 is provided with a water inlet hole (not shown in the figure) connected with the filter material filling area 45; and the clear liquid containing chamber 44 is provided with a water outlet hole 48 for outputting the clear liquid of quenched water. Specifically, the turbid quenched water from the quenching tower 5 enters the feed channel 41, and enters the filter material filling area 45 through a plurality of outlet holes spaced along the axial direction on the outlet section 42 of the feed channel 41. In the filter material filling area 45, the turbid quenched water is generally filtered in a transverse flow, and the particulate matter and oily wax-like organic matter in the turbid quenched water are filtered out by the filter material. The obtained clear quenched water enters the clear liquid containing chamber 44 through the water inlet hole of the clear liquid containing chamber 44, and then is output from the water outlet hole 48 of the clear liquid containing chamber 44 into the water washing tower 4, the quenching tower 5, and the sewage stripping tower 6. Specifically, the outlet hole 48 of the clear liquid containing chamber 44 is connected to the water washing tower 4, the quenching tower 5, and the sewage stripping tower 6 through pipelines.

[0068] In some specific embodiments, see Figure 2The liquid outlet section 42 of the feed channel 41 is arranged along the axial direction of the tower body 40, and the liquid outlet section 42 is inserted as a whole into the filter material filling area 45, that is, the filter material filling area 45 surrounds the periphery of the liquid outlet section 42, and the clear liquid accommodating chamber 44 is located at the periphery of the filter material filling area 45, and the liquid outlet holes of the liquid outlet section 42 are uniformly opened at intervals in the upper and lower directions of the entire liquid outlet section 42 along the axial direction thereof. After the quenched water turbid liquid enters the feed channel 41, it flows out from the liquid outlet holes of the liquid outlet section 42, so that there are multiple intervals of quenched water turbid liquid streams entering in the entire depth of the filter material filling area 45, which can effectively realize the separation of particulate matter and oily wax-like organic matter in the filter material, and the obtained quenched water clear liquid has a lower particulate matter content and oily wax-like organic matter content, which is conducive to better reducing the occurrence of blockage after it is passed into the water washing tower 4, the quenching tower 5 and the sewage stripping tower 6. In the microchannel separator of the specific structure of the present invention, the flow direction of the quenched water turbid liquid entering the filter material filling area is generally horizontal flow, which is different from the vertical flow of the traditional separator, and is conducive to forming a slower flow rate; and in the microchannel separator of the specific structure of the present invention, the oil organic matter in the quenched water turbid liquid that is generally horizontally flowing and diffusing is subjected to the adsorption, aggregation and growth of the filter material, and due to the density difference, it will continue to migrate upward, so that the filter material surface is renewed, which is conducive to the continuous adsorption and separation of the oil organic matter. In the traditional separator, it is basically vertical flow, and the wastewater fluid will provide a drag force to the oil organic matter adsorbed on the filter material, causing the oil organic matter to be always in the filter material, which is not conducive to the renewal of the filter material surface, and the oil organic matter will even migrate downward, and even penetrate the bed layer, resulting in poor wastewater treatment effect.

[0069] Further, see Figure 2The microchannel separator 3 further includes a cyclone 39, and the number of the cyclones 39 can be one or more. The cyclone 39 includes a cylindrical barrel 49 and a conical barrel 50 connected to the bottom of the cylindrical barrel 49, the side wall of the cylindrical barrel 49 is provided with an inlet 52, the top of the cylindrical barrel 49 is provided with an outlet 53, and the bottom of the conical barrel 50 is provided with a regenerated filter material outlet 51. The tower body 40 is provided with an overflow port 55 connected to the filter material filling area 45 and a regenerated filter material inlet 56, the overflow port 55 is connected to the inlet 52 of the cyclone 39 through a pipeline, and the regenerated filter material inlet 56 is connected to the regenerated filter material outlet 51 of the cyclone 39 through a pipeline. The tower body 40 is provided with a backwash inlet 46 for introducing regeneration gas (such as nitrogen or air) and backwash liquid into the filter material filling area 45, preferably, the backwash inlet 46 is arranged below the filter material filling area 45. Preferably, a distributor 47 for distributing regeneration gas and backwash liquid is provided at the bottom of the filter material filling area 45, and the backwash inlet 46 is connected to the distributor 47; the distributor 47 is provided with multiple outlets so that the regeneration gas and backwash liquid can evenly enter the filter material filling area 45, so as to achieve a better backwash effect. Specifically, a free space is reserved in the inner cavity of the tower body 40 corresponding to the area above the filter material filling area 45, and the overflow port 55 and the regenerated filter material inlet 56 are both arranged on the side wall of the tower body 40 corresponding to the free space, wherein the overflow port 55 is located above the regenerated filter material inlet 56; preferably, a one-way valve is provided on the connecting pipeline between the regenerated filter material outlet 51 and the regenerated filter material inlet 56, so that the connecting pipeline can only allow the material to flow from the regenerated filter material outlet 51 to the regenerated filter material inlet 56. Preferably, an exhaust port 54 is also provided on the tower body 40 of the present invention, and the exhaust gas in the tower body 40 can be discharged through the exhaust port 54 as needed.

[0070] In the microchannel separator of the present invention, a cyclone of a specific structure is adopted, and the cyclone is arranged outside the microchannel separator. Through the cooperation of the cyclone of the specific structure and the tower body of the microchannel separator, the cyclone can generate a cyclonic field for the material entering therein, and can provide a larger centrifugal force, thereby obtaining a better filter material regeneration effect. The method of the present invention also includes: when the filter material in the microchannel separator 3 needs to be regenerated, stop feeding the quenching water turbid liquid into the microchannel separator 3 that needs to regenerate the filter material, and introduce regeneration gas and backwashing liquid into the filter material filling area 45 of the microchannel separator 3 through the backwashing inlet 46 to backwash the filter material in the filter material filling area 45. During the backwashing process, the material in the filter material filling area 45 can be made to form a boiling state, that is, a boiling bed. Specifically, the filter material filling area can be made to form a boiling state by adjusting the flow rate of the regeneration gas and the backwashing liquid. With the continuous introduction of the regeneration gas and the backwashing liquid, the backwashing liquid carries the filter material into the cyclone 39 from the overflow port 55, specifically into the cylindrical barrel 49 of the cyclone 39, and a vortex is formed in the cylindrical barrel 49. Due to the strong flow shearing effect during the cyclone process, the filter particles in the cyclone 39 will rotate at high speed while revolving. The rotation and revolution generate periodic strong coupling centrifugal force, which promotes the outward migration of pollutants on the surface of the filter particles and in the pores. That is, the self-revolution of the filter particles can drive the micro-interface oscillation of the filter particles to achieve the desorption of oily waxy organic pollutants and the detachment of fine catalyst particles, thereby achieving efficient regeneration of the filter material, thereby obtaining regenerated filter material. The regenerated filter material enters the conical cylinder 50 during the cyclone process, and flows back from the regenerated filter material outlet 51 to the filter material filling area 45 of the tower body 40, while the removed catalyst fine powder and oily waxy organic matter overflow and discharge from the discharge port 53, for example, discharged to the downstream concentration system (for example, entering the downstream sedimentation tank) for further treatment. In some embodiments, the filter material used is loaded according to a certain particle size gradient or density gradient. In this case, the regenerated filter material that flows back into the tower body 40 will naturally settle and stratify according to its particle size and density gradient during the flow process after entering the tower body 40, forming a filter material loading form similar to the original sorting method; in some embodiments, the filter material can also be a filter material with a single particle size gradient or density gradient.

[0071] In a preferred embodiment, a plurality of microchannel separators 3 connected in parallel are used in the method of the present invention. When one or some microchannel separators 3 need to regenerate the filter material (for example, the filter material is regenerated after the microchannel separator 3 runs for a preset time or the pressure difference reaches a preset value), other microchannel separators 3 that do not need to regenerate the filter material can be used to continue to treat the quenched water turbid liquid to maintain the continuity of operation.

[0072] Figure 3The schematic diagram of the pipeline connection of multiple microchannel separators 3a, 3b, etc. connected in parallel in one embodiment is illustrated. The inlet 43 of the feed channel 41 of each microchannel separator is connected to the quenching water turbid liquid outlet of the quenching tower 5 through a pipeline, so that the quenching water turbid liquid can be fed into the feed channel 41, and a centrifugal pump 14 is provided on the pipeline; the water outlet 48 of the clear liquid holding chamber 44 is connected to the water washing tower 4, the quenching tower 5 and the sewage stripping tower 6 respectively through a pipeline, and a centrifugal pump 15 is provided on the pipeline; the backwash inlet 46 of the tower body 40 is respectively connected to the regeneration gas inlet pipeline 57 for introducing the regeneration gas and the backwash liquid inlet pipeline 58 for introducing the backwash liquid; the exhaust port 54 provided on the tower body 40 is connected to the exhaust pipeline 59; each pipeline is provided with a control valve for controlling the opening and closing of the pipeline. The microchannel separator that needs to regenerate the filter material can be switched to regenerate the filter material or used to treat the quenching water turbid liquid by opening and closing the control valve. Figure 3 For example, when it is necessary to regenerate the filter material of the microchannel separator 3a, the valves 31 and 34 are closed, and the introduction of quenching water turbid liquid into the microchannel separator is stopped; the valves 32, 33, 36, 37, and 38 are opened, and the regeneration gas and backwashing liquid are introduced into the filter material filling area 45 through the backwashing inlet 46 so that the filter material in the filter material filling area 45 is backwashed and forms a boiling state. With the continuous introduction of the regeneration gas and the backwashing liquid, the filter material in the tower body 40 is carried by the backwashing liquid and enters the cylindrical barrel 49 of the cyclone 39 from the overflow port 55 to form a cyclone. The catalyst fine powder and the oily wax organic matter are desorbed and separated through the cyclone separation, and flow out from the discharge port 53, and the regenerated filter material flows back to the filter material filling area 45 of the tower body 40 from the regenerated filter material outlet 51, thereby realizing the regeneration of the filter material. When the filter material is regenerated, valves 31 and 34 are reopened and valves 32, 33, 36, 37 and 38 are closed.

[0073] In the present invention, the regeneration gas may be nitrogen, air, etc., and the backwash liquid may be, for example, but not limited to, the turbid quenching water output from the quenching tower 5 or the clear quenching water produced in the microchannel separator or other applicable fluids.

[0074] In the microchannel separator 3 of the present invention, the filter material used is not particularly limited, and can be various filter materials conventionally used in the art, such as but not limited to quartz sand, anthracite, fruit shells, activated carbon, alumina particles, carbon balls or ceramic balls, etc. In some specific embodiments, illustratively, the catalyst used in the methanol to olefins process is, for example, micron-sized and / or nano-sized, and the filter material used is, for example, millimeter-sized.

[0075] Furthermore, the turbid washing water used as washing water and the clear quenching water used as washing water are cooled by the heat exchanger 10 and the air cooler 8, and then sent to the washing tower 4 for use. For example, the temperature of the washing water is controlled to about 60°C before entering the washing tower 4; the specific temperature can be determined according to the process requirements. The clear quenching water used as quenching water is cooled by the heat exchanger 11 and the air cooler 9, and then sent to the quenching tower 5 for use. For example, the temperature of the quenching water is controlled to about 60°C before entering the quenching tower 5; the specific temperature can be determined according to the process requirements.

[0076] In the method of the present invention, there is no particular restriction on the amount of the quench water clear liquid sent to the water washing tower 4, the amount sent to the quenching tower 5, and the amount of the washing water turbid liquid sent to the quenching tower 5. Preferably, it is based on the liquid level requirements that can be maintained in the water washing tower 4 and the quenching tower 5. Preferably, the water quality fluctuation range of the feed water entering the sewage stripping tower 6 can be reduced by adjusting the amount of the quench water clear liquid sent to the sewage stripping tower 6, thereby improving the operation stability of the sewage stripping tower 6.

[0077] In some embodiments, the total oil content of the quenched water turbidity obtained from the quenching tower 5 is 5-1000 mg / L; the total oil content of the washing water turbidity obtained from the washing tower 4 is 20-5000 mg / L.

[0078] In some embodiments, the method of the present invention is used to treat quench water and wash water, and the obtained quench water turbid liquid is treated by the microchannel separator 3 of the present invention, so that the suspended matter content in the quench water clear liquid can be controlled below 8 mg / L, and the oil content can be controlled below 35 mg / L. Compared with the traditional method for treating quench water and wash water in methanol to olefins product gas, the cleaning frequency of heat exchangers, air coolers, etc. can be reduced by more than 80%, and the blockage of the quench tower 5, the wash tower 4, and the sewage stripping tower 6 can be effectively reduced.

[0079] The method provided by the present invention can effectively purify the wash water and quench water generated in the purification of methanol to olefins product gas. The method is simple and effective, can greatly reduce the content of catalyst fine powder and oily waxy organic matter in the quench water turbid liquid, reduce equipment blockage, help to extend the equipment operation cycle, and simplify the treatment process.

[0080] The present invention also provides a water treatment system capable of implementing the water treatment method for purifying the methanol to olefins product gas described above. Figure 1 The water treatment system mainly includes a quenching tower 5, a water washing tower 4, a microchannel separator 3 and a sewage stripping tower 6.

[0081] The quench tower 5 is used to wash and cool the product gas generated from the methanol to olefins process using quench water to obtain quenched product gas and quench water turbid liquid;

[0082] The water washing tower 4 is connected to the quenching tower 5, and the water washing tower 4 is used to use washing water to wash and cool the quenched product gas again to obtain the washed product gas and the washing water turbidity liquid;

[0083] The water washing tower 4 is provided with a water washing liquid circulation pipeline for circulating part of the water washing liquid into the water washing tower 4 for use as water washing water;

[0084] A washing water turbidity liquid introduction pipeline 16 is connected between the washing tower 4 and the quenching tower 5, and is used to introduce part of the washing water turbidity liquid from the washing tower 4 into the quenching tower 5 for use as quenching water;

[0085] The microchannel separator 3 is connected to the quenching tower 5, and is used to receive the quenching water turbidity liquid from the quenching tower 5 and remove the particulate matter and part of the organic matter (mainly oily wax-like organic matter) in the quenching water turbidity liquid to obtain the quenching water clear liquid;

[0086] The microchannel separator 3 is provided with a quench water clear liquid outlet, which is connected to the water washing tower 4 and the quenching tower 5 respectively, so that part of the quench water clear liquid is respectively passed into the water washing tower 4 and the quenching tower 5, so as to be used as washing water and quenching water;

[0087] The sewage stripping tower 6 is connected to the water washing tower 4 and the microchannel separator 3 respectively, and is used to receive and process part of the turbid washing water and part of the clear cooling water, and obtain purified water and concentrated water.

[0088] Specifically, in the upstream methanol to olefin process, methanol reacts in the presence of a catalyst in a reactor 1 to prepare olefins, and the catalyst after the reaction is sent to a regenerator 2 for charring and regeneration. The product gas obtained in the reactor 1 is treated by a multi-stage cyclone separator configured in the reactor to remove part of the catalyst particles, and the quench tower 5 is connected to the product gas outlet of the reactor through a product gas delivery pipeline 7 to wash and cool the product gas. The product gas often carries part of the micro-nano catalyst fine powder and hydrocarbon organic matter, etc. After the product gas is treated by the quench tower 5 and the water washing tower 4 in the water treatment system of the present invention, the washing water turbidity part is input into the quench tower 5, and the quench water turbidity obtained in the quench tower 5 continues to enter the microchannel separator 3 for treatment, and the quench water clear liquid finally obtained is reused to the water washing tower 4, the quench tower 5 and the sewage stripping tower 6. The water treatment process of the present invention implemented by the water treatment system of the present invention can greatly reduce equipment blockage, reduce the frequency of equipment cleaning, and does not require supporting redundant filtering equipment, etc., with fewer processing links and low energy consumption.

[0089] Preferably, see Figure 2The microchannel separator 3 used in the present invention includes a tower body 40, and the tower body 40 is provided with a feed channel 41 for introducing quenched water turbid liquid, a clear liquid containing chamber 44 for containing quenched water clear liquid, and a filter material filling area 45 for filling filter material. The microchannel separator 3 is further provided with a cyclone 39. The specific structural description of the microchannel separator 3 can be found in the previous description, which will not be repeated here. More specifically, a first quenched water clear liquid introduction pipeline 60 for introducing part of the quenched water clear liquid into the quenched tower 5 is connected between the microchannel separator 3 and the quenching tower 5. The first quenched water clear liquid introduction pipeline 60 is provided with a heat exchanger 11 and an air cooler 9. The purpose of cooling is achieved by heat exchange with the refrigerant in the heat exchanger and heat exchange in the air cooler.

[0090] The water washing tower 4 is connected with a water washing water inlet pipeline 17 for introducing the washing water turbid liquid and the quenching water clear liquid used as washing water into the water washing tower 4. The water washing water inlet pipeline 17 is provided with a heat exchanger 10 and an air cooler 8. The purpose of cooling is achieved by heat exchange with the refrigerant in the heat exchanger and heat exchange in the air cooler. Specifically, the water washing water inlet pipeline 17 is connected with the washing water turbid liquid circulation pipeline 16. The washing water turbid liquid transported by the washing water turbid liquid circulation pipeline is sent to the water washing tower 4 together with the quenching water clear liquid used as washing water.

[0091] The above method provided by the present invention does not need to set up multiple sets of filters, the separation system is relatively simple, the operation process is small, and it is conducive to reducing equipment investment and energy consumption. In the present invention, part of the washing water enters the quenching tower 5, and enters the quenching water turbid liquid after being used as quenching water. The quenching water turbid liquid is purified by the microchannel separator 3 of the specific structure provided by the present invention, and the catalyst fine powder and oil wax organic matter therein are screened, intercepted, adsorbed, etc. by the filter material, so that the catalyst particle fine powder and organic matter content in the water gradually decrease with the depth of the filter layer; compared with the existing micro-cyclone separator, the method of the present invention can make up for the problem that the existing micro-cyclone separator has insufficient separation efficiency for particles less than 2μm, and at the same time, the method of the present invention can effectively improve the oil content of the washing water and the adhesion of the catalyst fine powder to the inner wall of the micro-cyclone and the clogging of the separator. The microchannel separator 3 of the specific structure used in the method of the present invention has the characteristics of simple equipment, low investment, easy regeneration of separation filter material, low energy consumption, and low maintenance cost. The microchannel separator 3 with a specific structure adopted can conveniently regenerate the filter material. During the filter material regeneration process, a cyclone field can be formed in the cyclone 39. Due to the existence of strong flow shearing effect, the particles in the cyclone 39 will rotate at high speed while revolving. The rotation and revolution produce periodic strong coupling centrifugal force, which helps the pollutants on the porous medium surface and pores of the filter material to migrate outward, thereby realizing efficient regeneration of the filter material; at the same time, it is easy to realize the recovery of the regenerated filter material. Compared with the traditional particle bed, it has the advantages of high regeneration intensity and good regeneration effect, and is suitable for the separation of catalyst fine powder and oil-containing wax medium with strong adhesion in MTO water.

[0092] After extensive and in-depth research, the inventors found that for the liquid-solid system of methanol to olefins plant quench water with large operating flow, low solid content and small particle size, and the treatment system of wash water with large operating flow, high oil content, low solid content and entrained catalyst fine particles, which is easy to block and difficult to operate stably, the most effective and lowest cost method in the prior art is to use a micro-cyclone separator for separation. However, in actual applications, it was found that the micro-cyclone separator used in the prior art has a poor separation effect on particles less than 2μm in quench water; because the wash water has a high oil content, a large oil viscosity, and entrained very fine catalysts, these substances tend to adhere to the inner wall of the micro-cyclone separator and accelerate the clogging of the micro-cyclone separator, so the separation effect in actual applications is not ideal. The inventors unexpectedly found that by adopting the process method of the present invention, equipment blockage can be effectively reduced; and the preferred supporting use of the microchannel separator of the specific structure provided by the present invention can achieve the deep removal of nano-micron-sized particles and hydrocarbon organic matter in the quench water turbid liquid and the recycling of water, which can reduce the cleaning frequency of the quench water, water washing water system heat exchanger, and air cooler by more than 80%, and effectively reduce the blockage of the water washing tower, the stripping tower, etc.

[0093] The present invention is further illustrated by specific embodiments below:

[0094] In a 1.8 million tons / year methanol to olefins process, its product gas is purified according to the method of the present invention. The water treatment process flow in the purification process is shown in FIG. Figure 1 , using multiple microchannel separators in parallel (see Figure 3 ), wherein the structural schematic diagram of the microchannel separator is shown in Figure 2 The quenched water turbidity containing solid catalyst and organic matter is treated by a microchannel separator. The specific description of the water treatment method and microchannel separator used can be referred to the previous description, which will not be repeated here. Figure 2 The microchannel separator shown in the figure is used to perform a small test on the treatment effect of quench water turbidity:

[0095] 1.Material properties and related parameters

[0096] The quenching water turbid liquid is a liquid-solid two-phase mixture, in which the water contains solid catalyst particles and oil (mainly waxy organic matter), wherein water is the continuous phase, and the oil and the solid catalyst are the dispersed phase medium.

[0097] The density of the quenching water turbid liquid is 915.4kg / m 3 , viscosity is 0.255cP; the temperature of the quenching water turbid liquid is 109℃, the content of spent catalyst in the quenching water turbid liquid is 450mg / L, and the average particle size of the spent catalyst is 2.0μm; since part of the washing water will be sent to the quenching tower, the oil content in the obtained quenching water turbid liquid is nearly 300mg / L.

[0098] The diameter of the tower body of a single microchannel separator is 72mm, the filter media is anthracite granular filter media with a particle size of 0.5-1mm, the filter bed thickness in the filter media filling area is 1300mm, and the processing capacity of a single microchannel separator is 50L / h.

[0099] 2. Implementation process

[0100] The turbid liquid of quenching water is sent to the microchannel separator, and the particles and waxy organic matter are removed after being treated by the filter material in the filter material filling area to obtain the clear liquid of quenching water; after a microchannel separator is operated continuously until the pressure difference rises to 0.3MPa, it is switched to backwash operation, and nitrogen is used as the regeneration gas (flow rate is 0.44Nm 3 / h), with quenching water as the backwash liquid (0.056m 3 / h) for backwashing. The backwashing time required for a single filter media regeneration is about 40 minutes, and the filter is put into use again after backwashing.

[0101] 4. Results Analysis

[0102] The solid content of the quenched water clear liquid was reduced from 450 mg / L to below 8 mg / L, and the particle removal rate exceeded 95%. The oil content was reduced from 300 mg / L to about 35 mg / L. During operation, the average pressure drop of the microchannel separator was 0.05 MPa.

[0103] In the above-mentioned small-scale test, the microchannel separator was operated continuously for two months. During the operation of the microchannel separator, backwashing was performed approximately every two days. By testing the particle removal rate and the oil content reduction effect, it was found that after each backwashing to regenerate the filter material, the microchannel separator could still maintain more than 90% of the initial separation effect (particle removal rate and oil content).

[0104] The method of the present invention can effectively remove catalyst particles and oily waxy organic matter in the quench water turbidity, greatly improve the water quality of the quench water clear liquid, and reuse it in the water washing tower, quenching tower and sewage stripping tower, which can greatly reduce the clogging of equipment and help extend the equipment operation cycle.

[0105] It is easy to understand that the above embodiments are only examples for clear explanation and do not mean that the present invention is limited thereto. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the protection scope of the present invention.

Claims

1. A method for treating water in the purification of methanol to olefins product gas, characterized in that: include: The product gas produced from the methanol to olefins process is sent to a quench tower to be washed and cooled with quench water to obtain quenched product gas and quench water turbid liquid; The quenched product gas is sent to a water washing tower to be washed again and cooled with washing water to obtain washed product gas and washing water turbidity; Circulating part of the turbid washing water to the washing tower for use as the washing water, and sending part of the turbid washing water to the quenching tower for use as the quenching water; The quenched water turbid liquid is sent to a microchannel separator for treatment to remove particulate matter and part of organic matter in the quenched water turbid liquid to obtain a quenched water clear liquid; Sending part of the quenching water clear liquid into the quenching tower for use as the quenching water, and sending part of the quenching water clear liquid into the water washing tower for use as the water washing water; Sending part of the quench water clear liquid and part of the washing water turbid liquid into a sewage stripping tower for treatment to obtain purified water; The microchannel separator comprises a tower body, wherein the tower body is provided with a feed channel for introducing the quenched water turbid liquid, a clear liquid receiving chamber for receiving the quenched water clear liquid, and a filter material filling area for filling filter material; The feed channel comprises a liquid outlet section inserted into the filter material filling area, the filter material filling area surrounds the outer periphery of the liquid outlet section, and the liquid outlet section is provided with a plurality of liquid outlet holes communicated with the filter material filling area at intervals along its axial direction; The filter material filling area is located between the liquid outlet section of the feed channel and the clear liquid containing chamber, the clear liquid containing chamber is located at the periphery of the filter material filling area, and the clear liquid containing chamber is provided with a water inlet hole communicating with the filter material filling area; The clear liquid containing chamber is provided with a water outlet hole for outputting the quenching water clear liquid; The microchannel separator is also provided with a cyclone outside, the cyclone comprises a cylindrical body and a conical body connected to the bottom of the cylindrical body, the side wall of the cylindrical body is provided with a material inlet, the top of the cylindrical body is provided with a material outlet, and the bottom of the conical body is provided with a regenerated filter material outlet; The tower body is provided with an overflow port communicating with the filter material filling area and a regenerated filter material inlet, the overflow port is communicated with the feed inlet of the cyclone, and the regenerated filter material inlet is communicated with the regenerated filter material outlet of the cyclone; a free space is reserved in the area above the filter material filling area in the tower body, the overflow port and the regenerated filter material inlet are both arranged on the side wall of the tower body corresponding to the free space, and the overflow port is located above the regenerated filter material inlet.

2. The water treatment method according to claim 1, characterized in that: The tower body is provided with a backwash inlet for introducing regeneration gas and backwash liquid into the filter material filling area; the method further comprises: When the filter material in the microchannel separator needs to be regenerated, the quenching water turbid liquid is stopped from being fed into the microchannel separator for which the filter material needs to be regenerated, and the regeneration gas and the backwashing liquid are introduced into the filter material filling area of ​​the microchannel separator through the backwashing inlet to backwash the filter material in the filter material filling area and make the filter material filling area form a boiling state; The backwash liquid carries the filter material into the cyclone from the overflow port, and removes the particulate matter and organic matter from the quench water turbid liquid attached to the filter material to obtain regenerated filter material. The regenerated filter material flows back from the regenerated filter material outlet to the filter material filling area, and the removed particulate matter and organic matter are discharged from the discharge port.

3. The water treatment method according to any one of claims 1 to 2, characterized in that: In the method, a plurality of the microchannel separators are used in parallel; The turbid washing water used as the washing water and the clear quenching water used as the washing water are cooled by a heat exchanger and an air cooler and then sent to the washing tower for use; The clear quench water used as the quench water is cooled by a heat exchanger and an air cooler and then sent to the quench tower for use.

4. A water treatment system for purification of methanol to olefins product gas, characterized in that: The water treatment system includes a quench tower, a water washing tower, a microchannel separator and a sewage stripping tower; The quench tower is used to wash and cool the product gas generated from the methanol to olefins process using quench water to obtain quenched product gas and quench water turbid liquid; The water washing tower is connected to the quenching tower, and the water washing tower is used to use washing water to wash and cool the quenched product gas again to obtain washed product gas and washing water turbidity; The water washing tower is provided with a water washing liquid circulation pipeline for circulating part of the water washing liquid into the water washing tower for use as the water washing water; A washing water turbid liquid introduction pipeline is connected between the washing tower and the quenching tower, for introducing part of the washing water turbid liquid from the washing tower into the quenching tower for use as the quenching water; The microchannel separator is in communication with the quench tower, and is used to receive the quench water turbidity liquid from the quench tower and remove particulate matter and part of organic matter in the quench water turbidity liquid to obtain quench water clear liquid; The microchannel separator is provided with a quenching water clear liquid outlet, and the quenching water clear liquid outlet is respectively connected to the water washing tower and the quenching tower, so that part of the quenching water clear liquid is used as the washing water and the quenching water respectively; The sewage stripping tower is respectively connected to the water washing tower and the microchannel separator, and is used to receive and process part of the washing water turbidity liquid and part of the quenching water clear liquid to obtain purified water; The microchannel separator comprises a tower body, wherein the tower body is provided with a feed channel for introducing the quenched water turbid liquid, a clear liquid receiving chamber for receiving the quenched water clear liquid, and a filter material filling area for filling filter material; The feed channel comprises a liquid outlet section inserted into the filter material filling area, the filter material filling area surrounds the outer periphery of the liquid outlet section, and the liquid outlet section is provided with a plurality of liquid outlet holes communicated with the filter material filling area at intervals along its axial direction; The filter material filling area is located between the liquid outlet section of the feed channel and the clear liquid containing chamber, the clear liquid containing chamber is located at the periphery of the filter material filling area, and the clear liquid containing chamber is provided with a water inlet hole communicating with the filter material filling area; The clear liquid containing chamber is provided with a water outlet hole for outputting the quenching water clear liquid; The microchannel separator is also provided with a cyclone outside, the cyclone comprises a cylindrical body and a conical body connected to the bottom of the cylindrical body, the side wall of the cylindrical body is provided with a material inlet, the top of the cylindrical body is provided with a material outlet, and the bottom of the conical body is provided with a regenerated filter material outlet; The tower body is provided with an overflow port communicating with the filter material filling area and a regenerated filter material inlet, the overflow port is communicated with the feed inlet of the cyclone, and the regenerated filter material inlet is communicated with the regenerated filter material outlet of the cyclone; a free space is reserved in the area above the filter material filling area in the tower body, the overflow port and the regenerated filter material inlet are both arranged on the side wall of the tower body corresponding to the free space, and the overflow port is located above the regenerated filter material inlet.

5. The water treatment system according to claim 4, characterized in that: The tower body is provided with a backwash inlet for introducing regeneration gas and backwash liquid into the filter material filling area.

6. The water treatment system according to claim 5, characterized in that: The backwash inlet is arranged below the filter material filling area.

7. The water treatment system according to claim 5, characterized in that: A distributor for acting on the regeneration gas and the backwash liquid is provided at the bottom of the filter material filling area, and the backwash inlet is connected to the distributor.

8. The water treatment system according to any one of claims 4 to 7, characterized in that: The microchannel separators are provided in plurality, and the plurality of microchannel separators are connected in parallel; A first quenching water clear liquid introduction pipeline for introducing part of the quenching water clear liquid into the quenching tower is connected between the microchannel separator and the quenching tower, and a heat exchanger and an air cooler are arranged on the first quenching water clear liquid introduction pipeline; The water washing tower is connected to a water washing water inlet pipeline for introducing turbid washing water and quenching clear water used as washing water into the water washing tower, and a heat exchanger and an air cooler are arranged on the water washing water inlet pipeline.

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