MTO (Methanol To Olefins) water scrubber system

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By designing a single MTO washing tower system, the dust removal and oil removal devices of the circulating pipelines at the bottom, in the tower, and over the tower are solved, and the efficient operation and cost reduction of the equipment are achieved.

CN222342351UActive Publication Date: 2025-01-14SHANGHAI REZEL KEHUA ENG DESIGN CO LTD

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Patent Information

Application Number: CN202421126986.2
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-05-22
Publication Date: 2025-01-14
Estimated Expiration: 2034-05-22

AI Technical Summary

Technical Problem

The equipment failure of the quench tower in the MTO device due to the catalyst blockage, high production energy consumption and high maintenance costs, the washing tower equipment structure is complex and the investment cost is high.

Method used

A single MTO washing tower system is designed, using the circulating pipelines at the bottom, in the tower and on the top of the tower, and the dust collector, degreaser and cooler are respectively set up to replace the combination of the original quench tower and the washing tower, and pass through the bottom and in the tower. , the top circulating pipeline removes catalysts and oils, reduces equipment blockage, and improves equipment utilization.

Benefits of technology

It realizes easy operation of a single tower, simple structure, small footprint, low investment cost, reduces the number of maintenance times, improves equipment utilization rate and heat recovery efficiency, and reduces production and operation costs.

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Abstract

The utility model provides an MTO (Methanol To Olefin) water scrubber system, belongs to the technical field of methanol to olefin, and solves the problems that in the prior art, the water-oil separation effect is poor, equipment is seriously blocked, part of equipment cannot be put into use, the heat exchange effect of a heat exchanger is poor, the overall production energy consumption is high, the overhaul cost is high, the production and operation cost is high, the equipment structure is complex, the investment is high and the like. The device comprises a water washing tower, the water washing tower is connected with a tower bottom circulating pipeline, a tower middle circulating pipeline and a tower top circulating pipeline, a tower bottom dust remover is arranged in the tower bottom circulating pipeline, a tower middle dust remover is arranged in the tower middle circulating pipeline, and an oil remover is arranged in the tower top circulating pipeline. The single water washing tower replaces the combination of a quench tower and a water washing tower in the prior art, and the single tower is easy to operate, simple in structure, reasonable in layout, small in occupied area and low in investment cost; the water washing tower removes a catalyst in washing water through a tower bottom dust remover and a tower middle dust remover, equipment blockage is avoided, an oil remover can remove oil in the washing water and recycle the oil, and the additional value is increased.

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Description

Technical Field

[0001] The utility model belongs to the technical field of methanol to olefins, in particular to an MTO water washing tower system. Background Art

[0002] The MTO water scrubber is an important component of the MTO industrial unit. Its main function is to reduce the temperature of the reaction gas and condense water, while further washing and removing the fine catalyst particles entrained in the reaction gas and removing the waxy substances in the water washing system. Through the function of the water scrubber, the purity and stability of the reaction gas can be guaranteed, thereby ensuring the safe, stable and long-term operation of the entire unit.

[0003] The MTO water scrubber in conventional technology must be used in conjunction with a quench tower. The reaction gas rich in ethylene and propylene enters the lower part of the quench tower, and the reaction gas contacts the quench water at the top of the quench tower from bottom to top in countercurrent, washing the small amount of catalyst carried in the reaction gas and reducing the temperature of the reaction gas. The quench water is extracted from the bottom of the tower in two streams. One stream of quench water is divided into two paths after passing through the quench tower bottom pump. One path is sent to the olefin separation unit as a low-temperature heat source to reduce the steam consumption of the olefin separation unit. The quench water returned after heat exchange is cooled by the quench water dry air cooler, and then the quench water returns to the upper part of the quench tower. The other quench water without heat exchange directly enters the sedimentation tank. The other stream of quench water enters the quench water primary cyclone separator after passing through the quench water cyclone pump to remove the catalyst carried in the quench water.

[0004] After the catalyst is removed by rapid cooling, the reaction gas enters the lower part of the water washing tower through the top of the rapid cooling tower. The water washing tower is equipped with a floating valve tray. The reaction gas contacts the washing water from bottom to top in countercurrent to reduce the temperature of the reaction gas. The water at the bottom of the water washing tower is pumped out by the washing water pump and divided into two paths. One path is deoiled by the washing water deoiler and then enters the washing water filter to filter and remove the catalyst carried in the washing water. The other washing water is sent to the reboiler at the bottom of the propylene distillation tower of the olefin separation unit as a heat source. After heat exchange, it is cooled by the washing water dry air cooler and the washing water cooler and then divided into two paths. One path enters the middle tray of the water washing tower, and the other path is cooled to 37°C by the washing water cooler and enters the first tray on the upper part of the water washing tower. The reaction gas at the top of the water washing tower is sent to the reaction gas compressor of the olefin separation unit under normal working conditions.

[0005] At present, the quenching tower of the MTO unit is seriously clogged during operation due to the presence of catalyst in the quenching water. As a result, the quenching water filter cannot be put into use, the spray granulation dryer cannot be put into use, and the olefin separation unit cannot use the quenching water as a heat source. The gasoline pump at the bottom of the water washing tower pumps out most of the water, the water-oil separation effect is poor, the equipment is seriously clogged, causing some equipment to be unable to be put into use, the heat exchanger has poor heat transfer effect, the overall production energy consumption is high, the maintenance cost is high, the production operation cost is high, the equipment structure is complex, and the investment is high. Utility Model Content

[0006] In view of the above problems, the purpose of the utility model is to provide an MTO water washing tower system. A single water washing tower replaces the combination of a quenching tower and a water washing tower in the original technology. The single tower is easy to operate, has a simple structure, a reasonable layout, a small footprint, and a low investment cost. The water washing tower removes the catalyst in the washing water through the bottom dust collector and the dust collector in the tower to avoid clogging of the equipment, thereby reducing the number of maintenance times. The oil remover can remove the oil in the washing water and recycle it to increase added value.

[0007] The technical solution adopted by the utility model is as follows:

[0008] An MTO water washing tower system comprises a water washing tower, wherein the water washing tower is connected with a tower bottom circulation pipeline, a tower middle circulation pipeline and a tower top circulation pipeline, a tower bottom dust collector is arranged in the tower bottom circulation pipeline, a tower middle circulation pipeline is arranged in the tower middle dust collector, and an oil remover is arranged in the tower top circulation pipeline.

[0009] Preferably, a bottom heat exchanger located behind the bottom dust collector is provided in the bottom circulation pipeline.

[0010] Preferably, a tower heat exchanger located behind the tower dust collector is provided in the tower circulation pipeline.

[0011] Preferably, a top cooler is provided in the top circulation pipeline.

[0012] Preferably, the tower top cooler is located behind the deoiler.

[0013] Preferably, the end of the tower bottom circulation pipeline is connected to a mid-tower water supply pipe connected to the mid-tower circulation pipeline.

[0014] Preferably, the end of the circulating pipeline in the tower is connected to a tower top water supply pipe connected to the tower top circulating pipeline.

[0015] Preferably, the circulating pipeline in the tower is connected with an alkali solution delivery pipe, and the connection between the alkali solution delivery pipe and the circulating pipeline in the tower is located in front of the dust collector in the tower.

[0016] Preferably, the water washing tower is provided with trays arranged from top to bottom, and the trays are provided with 26 layers, wherein the trays of the 1st to 6th layers are float valve trays, the trays of the 7th to 16th layers are fixed trays, and the trays of the 17th to 26th layers are herringbone baffles.

[0017] Preferably, a bottom circulation pump is provided in the tower bottom circulation pipeline, a mid-tower circulation pump is provided in the mid-tower circulation pipeline, and a top-tower circulation pump is provided in the tower top circulation pipeline.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0019] A single water washing tower replaces the combination of a quenching tower and a water washing tower in the original technology. The single tower is easy to operate, has a simple structure, a reasonable layout, a small footprint, and a low investment cost. The water washing tower removes the catalyst in the washing water through the dust collector at the bottom of the tower and the dust collector in the tower to avoid equipment blockage, thereby reducing the number of maintenance times. The oil remover can remove the oil in the washing water and recycle it to increase added value. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of a flow chart provided for an embodiment of the utility model.

[0022] Description of the drawings: 1-water washing tower; 2-tower bottom circulation pump; 3-tower bottom dust collector; 4-tower bottom heat exchanger; 5-tower circulation pump; 6-tower dust collector; 7-tower heat exchanger; 8-tower top circulation pump; 9-tower top cooler; 10-oil remover; 11-reaction gas inlet pipe; 12-reaction gas exhaust pipe; 13-alkali solution delivery pipe; 14-tower water supply pipe; 15-tower top water supply pipe. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model 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 present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] Combine the following Figure 1 The utility model is described in detail.

[0027] Example

[0028] An MTO water washing tower system comprises a water washing tower 1, wherein the water washing tower 1 is connected with a tower bottom circulation pipeline, a tower middle circulation pipeline and a tower top circulation pipeline, a tower bottom dust collector 3 is arranged in the tower bottom circulation pipeline, a tower middle circulation pipeline is arranged with a tower middle dust collector 6, and an oil remover 10 is arranged in the tower top circulation pipeline.

[0029] The lower end of the water washing tower 1 is connected to a reaction gas inlet pipe 11, and the top of the water washing tower 1 is connected to a reaction gas exhaust pipe 12. The reaction gas enters the water washing tower 1 from the reaction gas inlet pipe 11 and contacts with the washing water in countercurrent, thereby removing the catalyst in the reaction gas. The washing water containing the catalyst passes through the bottom circulation pipeline and the middle circulation pipeline of the tower to remove the catalyst in the washing water to avoid clogging the equipment. The top circulation pipeline removes and recovers the oil in the washing water to increase the added value.

[0030] A water collecting tank is set at the entrance of the top circulation pipeline and the middle circulation pipeline to receive part of the washing water in the washing tower 1, so as to facilitate the circulation of the washing water at the top and in the tower. The dust collector 3 at the bottom of the tower and the dust collector 6 in the tower can be selected in various forms such as hydrocyclone, sedimentation and filtration. 4 to 6 dust collectors 3 at the bottom of the tower can be set to remove 70 to 80% of the solid catalyst carried by the washing water. 2 to 3 dust collectors 6 in the tower can be set to remove 10 to 20% of the solid catalyst carried by the washing water. The circulation volume of the bottom circulation pipeline accounts for 20 to 40% of the total circulation volume, the circulation volume of the middle circulation pipeline accounts for 40 to 60% of the total circulation volume, and the circulation volume of the top circulation pipeline accounts for 20 to 40% of the total circulation volume.

[0031] The bottom heat exchanger 4 is arranged in the bottom circulation pipeline and is located behind the bottom dust collector 3. The bottom heat exchanger 4 can recover the heat of the wash water in the bottom circulation pipeline, and the heat is used to preheat the raw material methanol; the bottom heat exchanger 4 is arranged behind the bottom dust collector 3 to avoid the catalyst from clogging the bottom heat exchanger 4.

[0032] The tower circulation pipeline is provided with a tower heat exchanger 7 located behind the tower dust collector 6. The tower heat exchanger 7 can recover the heat of the wash water in the tower circulation pipeline, and this part of the heat is used as the reboiler heat source of each tower of the olefin separation unit, saving the steam consumption of the olefin separation unit; the tower heat exchanger 7 is arranged behind the tower dust collector 6 to avoid the catalyst from clogging the tower heat exchanger 7.

[0033] The tower bottom heat exchanger 4 and the tower mid-heat exchanger 7 improve the utilization rate of water washing water heat, reduce the production energy consumption of the water system, and save production and operation costs.

[0034] A tower top cooler 9 is provided in the tower top circulation pipeline. The tower top cooler 9 is used to control the tower top temperature; the tower top cooler 9 can be a water-cooled or air-cooled cooler. The tower top cooler 9 is located behind the degreaser 10. The high-temperature washing water first enters the degreaser 10 for degreasing. When the temperature is high, the degreasing effect of the degreaser 10 can be improved. Two to four degreasers 10 can be provided.

[0035] The end of the tower bottom circulation pipeline is connected to a tower middle water supply pipe 14 connected to the tower middle circulation pipeline, and the end of the tower middle circulation pipeline is connected to a tower top water supply pipe 15 connected to the tower top circulation pipeline. The tower middle water supply pipe 14 introduces part of the treated washing water in the tower bottom circulation pipeline into the tower middle circulation pipeline, and the tower top water supply pipe 15 introduces part of the treated washing water in the tower middle circulation pipeline into the tower top circulation pipeline, so as to meet the water demand of the three-stage circulation pipeline of the water washing tower 1, save water supply for other process media, and reduce production and operation costs.

[0036] The tower circulation pipeline is connected with an alkali solution delivery pipe 13, and the connection between the alkali solution delivery pipe 13 and the tower circulation pipeline is located in front of the tower dust collector 6. The alkali solution delivery pipe 13 delivers the alkali solution to the tower circulation pipeline, adjusts the pH value of the washing water in the tower circulation pipeline, and part of the washing water in the tower circulation pipeline flows into the bottom of the tower for bottom circulation, and part of the washing water in the tower circulation pipeline enters the tower circulation pipeline through the tower top water supply pipe 15 for circulation, so that the pH value of the washing water in the entire washing tower 1 is neutral. The alkali solution delivery pipe 13 can also be connected to the tower bottom circulation pipeline and the tower top circulation pipeline according to the acidity of the reaction gas.

[0037] The water washing tower 1 is provided with trays arranged from top to bottom, and the trays are provided with 26 layers (such as Figure 1The washing tower 1 shown in the figure is marked with numbers), wherein the tower plates of the 1-6 layers are floating valve tower plates, the tower plates of the 7-16 layers are fixed tower plates, and the tower plates of the 17-26 layers are herringbone baffles. The washing water of the 1-6 layers is relatively clean, and the catalyst carried in the reaction gas has been almost washed clean. The use of floating valve tower plates is highly efficient and has a significant effect on controlling the tower top temperature; 7-16 are fixed tower plates, with large production capacity, small tower plate resistance, low mechanical failure, and significant effect on reducing the reaction gas temperature; 17-26 are herringbone baffles, with large processing capacity, not easy to be blocked, and significant effect on washing the catalyst carried in the reaction gas.

[0038] A tower bottom circulation pump 2 is provided in the tower bottom circulation pipeline, a tower middle circulation pump 5 is provided in the tower middle circulation pipeline, and a tower top circulation pump 8 is provided in the tower top circulation pipeline. The tower bottom circulation pump 2, the tower middle circulation pump 5 and the tower top circulation pump 8 are used to circulate and transport the washing water in the three-stage circulation pipeline. The tower bottom circulation pump 2 extracts washing water from the tower bottom, and the washing water is returned to the 16th tower tray after treatment. The MTO reaction gas itself carries a large amount of water vapor. After washing and cooling, a large amount of water will be generated. The excess water can be discharged through the outlet of the tower bottom circulation pump 2; the tower middle circulation pump 5 extracts washing water from the 15th tower tray of the washing tower 1, and the washing water is returned to the 7th tower tray after treatment; the tower top circulation pump 8 extracts washing water from the 6th tower tray of the washing tower 1, and the washing water is returned to the 1st tower tray after treatment. 2 to 4 tower bottom circulation pumps 2, tower middle circulation pumps 5 and tower top circulation pumps 8 can be provided.

[0039] The connection between the alkali solution delivery pipe 13 and the circulating pipeline in the tower can be arranged in front of the circulating pump 5 in the tower, which can greatly reduce the alkali injection pressure and extend the service life of the alkali injection pipeline.

[0040] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An MTO water scrubber system, comprising a water scrubber (1), characterized in that: The water washing tower (1) is connected to a tower bottom circulation pipeline, a tower mid-circulation pipeline and a tower top circulation pipeline, a tower bottom circulation pipeline is provided with a tower bottom dust collector (3), a tower mid-circulation pipeline is provided with a tower mid-circulation pipeline, and an oil remover (10) is provided in the tower top circulation pipeline.

2. An MTO water scrubber system according to claim 1, characterized in that: A tower bottom heat exchanger (4) located behind the tower bottom dust collector (3) is arranged in the tower bottom circulation pipeline.

3. An MTO water scrubber system according to claim 1, characterized in that: The tower circulation pipeline is provided with a tower heat exchanger (7) located behind the tower dust collector (6).

4. The MTO water scrubber system according to claim 1, characterized in that: A tower top cooler (9) is arranged in the tower top circulation pipeline.

5. The MTO water scrubber system according to claim 4, characterized in that: The tower top cooler (9) is located behind the oil remover (10).

6. The MTO water scrubber system according to claim 1, characterized in that: The end of the tower bottom circulation pipeline is connected to a tower water replenishment pipe (14) connected to the tower circulation pipeline.

7. The MTO water scrubber system according to claim 1, characterized in that: The end of the tower circulation pipeline is connected to a tower top water supply pipe (15) connected to the tower top circulation pipeline.

8. The MTO water scrubber system according to claim 1, characterized in that: The circulating pipeline in the tower is connected to an alkali solution delivery pipe (13), and the connection between the alkali solution delivery pipe (13) and the circulating pipeline in the tower is located in front of the dust collector (6) in the tower.

9. The MTO water scrubber system according to claim 1, characterized in that: The water washing tower (1) is provided with tower trays arranged from top to bottom, with 26 layers of tower trays, wherein the tower trays of layers 1 to 6 are floating valve tower trays, the tower trays of layers 7 to 16 are fixed tower trays, and the tower trays of layers 17 to 26 are herringbone baffles.

10. The MTO water scrubber system according to claim 1, characterized in that: The tower bottom circulation pipeline is provided with a tower bottom circulation pump (2), the tower middle circulation pipeline is provided with a tower middle circulation pump (5), and the tower top circulation pipeline is provided with a tower top circulation pump (8).