Device for recovering high-boiling-point substances and reducing solid content in concentration tower

Abstract

The utility model relates to the technical field of concentration tower recovery processing equipment, in particular to a device for recovering high-boiling residues and reducing solid content of a concentration tower, the bottom of a concentration tower body is connected with a concentration tower reboiler, the inlet end of a concentration tower kettle pump is connected with the bottom of the concentration tower reboiler, and the inlet end of the concentration tower kettle pump is connected with the bottom of the concentration tower reboiler. A high-boiling residue impurity removal liquid-solid separator is connected to the outlet end of the high-boiling residue impurity removal device, and the outlet end of the high-boiling residue impurity removal liquid-solid separator is connected with the inlet end of the high-boiling cracking device; one side of the concentration tower body is connected with a slag inlet pipeline, the top of the concentration tower body is connected with a discharge pipeline, and the discharge pipeline is provided with a circulating treatment assembly.According to the high-boiling residue impurity removal liquid-solid separator, the solid content of chlorosilane is reduced, erosive wear of solid particles to the inner wall of a pipeline is greatly reduced, the service life of the pipeline is remarkably prolonged, and the cost is reduced. And the frequency of pipeline maintenance and replacement is reduced, and the pipeline maintenance cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the concentrated recovery processing equipment technical field, especially point to a kind of device for concentrated recovery high-boiling substance reduces solid content. BACKGROUND

[0002] In the concentrated recovery high-boiling substance reduces solid content process, especially in the polysilicon production process, a large amount of chlorosilane mixture containing high-boiling substance and solid impurities (such as silicon powder) will be generated, the traditional processing mode is that after the material of synthesis device is discharged, the concentrated reflux tank product is sent to the impurity removal tower for treatment after solid-liquid separation in the concentration tower, while the chlorosilane containing silicon powder in the concentration tower reboiler is directly sent to high-boiling cracking recovery, however, this mode has many problems.

[0003] Firstly, the chlorosilane with high solid content and high-boiling substance are directly sent to high-boiling cracking device, due to the existence of solid particles (such as silicon powder), the pipeline is seriously worn in the material conveying process, the inner wall of the pipeline will soon appear the phenomenon of wear and thinning under the high-speed scouring of solid particles, which increases the risk of pipeline leakage, not only affects the continuity of production, but also brings high maintenance cost due to frequent replacement of pipeline.

[0004] Secondly, after the material with high solid content enters the high-boiling cracking equipment, serious wear and fouling phenomenon will occur on the components such as impeller, pump cavity and heat exchanger tube bundle inside the equipment, the precise structure inside the equipment is damaged, which reduces the heat exchange efficiency of the equipment and the pumping capacity, and greatly increases the equipment failure rate, which not only shortens the service life of the equipment and increases the investment cost of equipment update, but also seriously affects the production efficiency due to frequent equipment failure and maintenance, and reduces the economic benefit of enterprise.

[0005] In addition, due to high solid content, the filter and other equipment need to be cleaned frequently, which not only increases the workload of operators, but also exists safety risks such as material leakage and operators contacting harmful substances during the opening operation of cleaning filter and other pipelines, and is not conducive to environmental protection, because the waste containing solid impurities such as silicon powder generated during cleaning process will pollute the environment if not properly treated.

[0006] Therefore, the present application provides a device for concentrated recovery high-boiling substance to reduce solid content, which solves the above technical problems. UTILITY MODEL CONTENT

[0007] In view of the deficiencies in the background art, the utility model provides a device for reducing solid content of high-boiling substances recovered from concentration column, solves the problem of serious abrasion of pipeline during material conveying, high solid content, and frequent cleaning of filter and other equipment, which not only increases the workload of operators, but also causes material leakage and operators to contact harmful substances during cleaning of filter and other pipelines, and is not conducive to environmental protection.

[0008] The technical scheme of the utility model is as follows: a device for reducing solid content of high-boiling substances recovered from concentration column, comprising a concentration column body, a concentration column kettle pump and a high-boiling cracking device, characterized in that: the bottom of the concentration column body is connected with a concentration column reboiler, the inlet end of the concentration column kettle pump is connected with the bottom of the concentration column reboiler, the outlet end is connected with a high-boiling impurity-removing liquid-solid separator, and the outlet end of the high-boiling impurity-removing liquid-solid separator is connected with the inlet end of the high-boiling cracking device; one side of the concentration column body is connected with a residue inlet pipeline, and the top is connected with a discharge pipeline, and a circulating treatment assembly is arranged on the discharge pipeline.

[0009] As a preferred scheme, the circulating treatment assembly comprises a concentration column backflow pump, a concentration column backflow tank, a concentration column air cooler and a column top production pipeline, the concentration column air cooler is connected in series on the discharge pipeline, the outlet end of the concentration column air cooler is connected with the top inlet end of the concentration column backflow tank, the bottom outlet end of the concentration column backflow tank is connected with the inlet end of the concentration column backflow pump, the outlet end of the concentration column backflow pump is connected with the column top production pipeline, and the top of the concentration column backflow tank is connected with an auxiliary pipeline.

[0010] As a preferred scheme, the high-boiling impurity-removing liquid-solid separator further comprises a filter core backflushing assembly, the filter core backflushing assembly comprises a backflushing pipeline, a backflushing pump and a backflushing control valve, the backflushing pipeline is connected with the filter core in the high-boiling impurity-removing liquid-solid separator, and the backflushing pump and the backflushing control valve are connected on the backflushing pipeline.

[0011] As a preferred scheme, the connecting pipeline between the high-boiling impurity-removing liquid-solid separator and the concentration column kettle pump and the high-boiling cracking device adopts a metal sealing ring connection structure, and the metal sealing ring adopts an alloy material with high temperature resistance and corrosion resistance.

[0012] As a preferred scheme, the metal sealing ring connection structure adopts a mortise and tenon type sealing arrangement, and the tenon of the metal sealing ring is tightly matched with the slot of the connecting pipeline.

[0013] As a preferred scheme, the concentration column body is made of carbon steel with a polytetrafluoroethylene lining, and the thickness of the polytetrafluoroethylene lining layer is 3-5 mm.

[0014] As a preferred solution, the operating pressure inside the concentration tower body is controlled between 0.2-0.5 MPa, and the operating temperature is controlled between 80-120℃.

[0015] As a preferred solution, the cracking reaction temperature in the high-boiling cracking device is controlled between 200-300℃, the reaction pressure is controlled between 0.5-1.0 MPa, and a catalyst is added during the cracking reaction, which is a transition metal oxide catalyst, and the addition amount is 0.5%-2% of the mass of the high-boiling substance.

[0016] The utility model discloses the beneficial effects of:

[0017] I. Prolong the service life of the equipment

[0018] Reduce pipeline wear: the solid content of chlorosilane is reduced by the high-boiling substance impurity removal liquid-solid separator, which greatly reduces the erosion and wear of the solid particles on the inner wall of the pipeline, significantly prolongs the service life of the pipeline, reduces the frequency of pipeline maintenance and replacement, and reduces the pipeline maintenance cost.

[0019] Reduce equipment internal wear: low solid content material entering the high-boiling cracking equipment reduces the wear and fouling of internal components (such as impeller, pump cavity, heat exchanger tube bundle, etc.), maintains the precision structure and good operating condition of the equipment interior, effectively prolongs the service life of the high-boiling cracking equipment, reduces the equipment failure rate, and reduces the equipment update investment.

[0020] II. Save cost

[0021] Reduce silicon consumption and chlorine consumption: due to the reduction of solid content, the side reactions caused by solid impurities are reduced in the subsequent high-boiling cracking process, thereby reducing the loss of silicon and chlorine elements in non-target reactions, improving the utilization rate of raw materials, reducing the amount of raw material replenishment, and reducing the cost of raw materials.

[0022] Reduce maintenance and cleaning cost: the reduction of pipeline and equipment failure rate reduces the downtime caused by equipment maintenance, improves production efficiency, saves maintenance cost, and at the same time, reduces the workload and cost of opening operations such as frequent cleaning of filters and pipelines, including labor cost, cleaning material cost, and production loss caused by downtime, etc.

[0023] III. Improve safety and environmental protection

[0024] Reduce safety risk: the number of opening operations such as equipment failure and frequent cleaning of filters and pipelines is reduced, the probability of safety risks such as exposure to harmful substances and mechanical injury of operating personnel during equipment maintenance and cleaning is reduced, and the safety of personnel during production is ensured.

[0025] Reduce environmental pressure: backwash wastewater is treated by a special collection and treatment system, avoiding the pollution caused by the random discharge of wastewater containing solid impurities such as silicon powder, and at the same time, the stability of the system is improved, reducing the environmental accidents such as material leakage caused by equipment failure, which is beneficial to environmental protection.

[0026] Four, improve production efficiency and product quality

[0027] Improve the recovery of chlorosilane: the solid-liquid separator for high-boiling impurity removal optimizes the separation effect of chlorosilane and high-boiling substances, so that more chlorosilane can be recovered and utilized in a low solid content state, improving the recovery efficiency of chlorosilane, providing more sufficient and pure raw materials for subsequent production, and helping to improve the yield of the entire production system.

[0028] Ensure the continuity of high-boiling treatment: stable equipment operation and low solid content ensure that the high-boiling cracking device can operate continuously and stably, reducing production interruptions caused by equipment failure or solid content problems, improving the continuity and stability of production, and facilitating the rational arrangement of production plans, timely completion of production tasks, and meeting market demand. At the same time, stable process conditions also help to improve the quality of high-boiling cracking products and improve the market competitiveness of products.

[0029] Other advantages, objectives and features of the present utility model will be described in the subsequent specification to some extent, and to some extent, it will be obvious to those skilled in the art based on the study of the following text or can be taught from the practice of the present utility model. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present utility model, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present utility model, and those skilled in the art can obtain other drawings according to these drawings without creating labor.

[0031] Figure 1 The structure of the present utility model is shown in the figure.

[0032] In the figure: 1: concentration tower body, 2: concentration tower kettle pump, 3: high-boiling cracking device, 4: concentration tower reboiler, 5: high-boiling impurity removal liquid-solid separator, 6: residue inlet pipeline, 7: discharge pipeline, 8: concentration tower backflow pump, 9: concentration tower backflow tank, 10: concentration tower air cooler, 11: overhead production pipeline, 12: auxiliary pipeline, 13: backwash pipeline, 14, backwash pump, 15: backwash control valve. DETAILED DESCRIPTION

[0033] The following will combine the drawings needed in the embodiment of the present utility modelFigure 1 In order to make the technical solutions in the embodiments of the present application clear and complete, it is obvious that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] Embodiment 1, a device for reducing the solid content of high-boiling substances recovered from a concentration tower, comprising a concentration tower body 1, a concentration tower kettle pump 2 and a high-boiling cracking device 3, characterized in that: the bottom of the concentration tower body 1 is connected with a concentration tower reboiler 4, the inlet end of the concentration tower kettle pump 2 is connected with the bottom of the concentration tower reboiler 4, and the outlet end is connected with a high-boiling impurity-removing liquid-solid separator 5, and the outlet end of the high-boiling impurity-removing liquid-solid separator 5 is connected with the inlet end of the high-boiling cracking device 3; one side of the concentration tower body 1 is connected with a residue inlet pipeline 6, and the top is connected with a discharge pipeline 7, and the discharge pipeline 7 is provided with a circulating treatment assembly.

[0035] As a further embodiment, the circulating treatment assembly comprises a concentration tower reflux pump 8, a concentration tower reflux tank 9, a concentration tower air cooler 10 and a tower top production pipeline 11, the concentration tower air cooler 10 is connected in series on the discharge pipeline 7, the outlet end of the concentration tower air cooler 10 is connected with the top inlet end of the concentration tower reflux tank 9, the bottom outlet end of the concentration tower reflux tank 9 is connected with the inlet end of the concentration tower reflux pump 8, the outlet end of the concentration tower reflux pump 8 is connected with the tower top production pipeline 11, and the top of the concentration tower reflux tank 9 is connected with the discharge pipeline 7 through an auxiliary pipeline 12.

[0036] As a further embodiment, the high-boiling impurity-removing liquid-solid separator 5 further comprises a filter core backwashing assembly, the filter core backwashing assembly comprises a backwashing pipeline 13, a backwashing pump 14 and a backwashing control valve 15, the backwashing pipeline 13 is connected with the filter core inside the high-boiling impurity-removing liquid-solid separator 5, and the backwashing pump 14 and the backwashing control valve 15 are connected on the backwashing pipeline 13.

[0037] As a further embodiment, the concentration tower body 1 is made of carbon steel material lined with polytetrafluoroethylene, and the thickness of the polytetrafluoroethylene lining layer is 3-5 mm.

[0038] As a further embodiment, the internal operating pressure of the concentration tower body 1 is controlled between 0.2-0.5 MPa, and the operating temperature is controlled between 80-120 DEG C.

[0039] As a further embodiment, the cracking reaction temperature in the high-boiling cracking device 3 is controlled between 200-300°C, the reaction pressure is controlled between 0.5-1.0 MPa, and a catalyst is added during the cracking reaction, the catalyst being a transition metal oxide catalyst, the addition amount being 0.5%-2% of the mass of the high-boiling substance.

[0040] In use, first, select a suitable specification of the concentration tower body 1, ensure that the internal structure is complete and has no leakage, connect the concentration tower reboiler 4 to the bottom of the concentration tower body 1 by welding or flange connection or other reliable means, and ensure that the connection part is sealed well to facilitate effective heat exchange. The concentration tower body 1 is provided with a circulating pipeline, and the concentration tower reboiler 4 is connected to the circulating pipeline. Then, install the concentration tower kettle pump 2 at the bottom of the concentration tower reboiler 4, and tightly connect the inlet end of the kettle pump to the bottom of the reboiler to ensure that the mixture of chlorosilane containing silicon powder and high-boiling substances can be smoothly pumped out. Next, connect the high-boiling substance impurity-removing liquid-solid separator 5 to the outlet end of the concentration tower kettle pump 2, and also ensure the sealing of the connection to prevent material leakage. Connect the inlet end of the high-boiling cracking device 3 to the outlet end of the high-boiling substance impurity-removing liquid-solid separator 5, so that the material after liquid-solid separation can accurately and correctly enter the high-boiling cracking device.

[0041] Install the slag inlet pipeline 6 on one side of the concentration tower body 1 for receiving the material after the slag is discharged from the synthesis device. The connection between the slag inlet pipeline 6 and the concentration tower body 1 should adopt a wear-resistant and well-sealed connection method, such as lined pipeline connection. Install the discharge pipeline 7 at the top of the concentration tower body 1, and sequentially install the concentration tower air cooler 10, the concentration tower reflux tank 9, the concentration tower reflux pump 8, and the tower top extraction pipeline 11 on the discharge pipeline 7. The concentration tower air cooler 10 is connected in series on the discharge pipeline 7, and the inlet and outlet thereof are connected to the discharge pipeline 7 by welding or flange connection to ensure that the cooling medium and the material can be effectively heat-exchanged. The outlet end of the concentration tower air cooler 10 is connected to the top inlet end of the concentration tower reflux tank 9 through a pipeline, and the connection pipeline should have a certain inclination to facilitate the smooth flow of the material into the reflux tank. The bottom outlet end of the concentration tower reflux tank 9 is connected to the inlet end of the concentration tower reflux pump 8, and the outlet end of the reflux pump 8 is connected to the tower top extraction pipeline 11. Each connection part needs to be well sealed to prevent material leakage and gas mixing. At the same time, connect the auxiliary pipeline 12 between the top of the concentration tower reflux tank 9 and the discharge pipeline 7, and install control elements such as regulating valves on the auxiliary pipeline 12 to adjust the flow distribution of the material during the circulating treatment process.

[0042] For the installation of the filter element inside the high-boiling impurity removal liquid-solid separator 5, ensure that the filter element is securely and tightly installed to ensure the filtering effect. When connecting the backwashing pipeline 13 in the backwashing assembly of the filter element, pay attention to the tightness of the connection to prevent backwashing liquid leakage. The backwashing pump 14 and the backwashing control valve 15 should be correctly installed on the backwashing pipeline 13. The backwashing pump 14 should be installed on a suitable foundation to ensure stable operation. The backwashing control valve 15 should be installed in a position that is convenient for operation and maintenance.

[0043] The concentration column body 1 is made of carbon steel lined with polytetrafluoroethylene. During manufacturing, first select polytetrafluoroethylene plates of appropriate thickness (3-5 mm) and line them inside the carbon steel shell through processes such as thermoforming or pasting. Ensure that the polytetrafluoroethylene layer is tightly attached to the carbon steel shell without bubbles, wrinkles, or other defects to ensure good corrosion resistance. For the carbon steel shell part, perform corresponding welding, inspection, and other treatments to ensure that its structural strength and sealing performance meet the requirements.

[0044] Before the device is operated, set the internal operating pressure of the concentration column body 1 to between 0.2-0.5 MPa and the operating temperature to between 80-120℃. Monitor the pressure and temperature inside the concentration column in real time through pressure and temperature sensors and connect them to the control system to achieve automatic control or manual adjustment. The control system can use programmable logic controllers (PLC) or distributed control systems (DCS), etc. According to the set pressure and temperature range, maintain stable operating conditions inside the concentration column by adjusting steam flow, cooling medium flow, etc.

[0045] For the high-boiling cracking device 3, before the cracking reaction, set the reaction temperature to between 200-300℃ and the reaction pressure to between 0.5-1.0 MPa. Use heating systems (such as electric heating or fuel heating) and pressure regulation systems (such as regulating valves, vacuum pumps, etc.) to achieve and control the reaction temperature and pressure. At the same time, accurately weigh 0.5%-2% of the high-boiling substance and add the transition metal oxide catalyst uniformly into the high-boiling cracking device 3. The catalyst can be added through a solid feeder or liquid spraying, etc. to ensure uniform distribution of the catalyst in the high-boiling substance to improve the cracking reaction efficiency.

[0046] In Example 2, a device for recovering high-boiling substances with reduced solid content from a concentration column, based on Example 1, the connection pipeline between the high-boiling impurity removal liquid-solid separator 5 and the concentration column column still pump 2 and the high-boiling cracking device 3 uses a metal sealing ring connection structure. The metal sealing ring uses an alloy material that is resistant to high temperature and corrosion.

[0047] As a further embodiment, the metal seal ring connecting structure adopts a mortise and tenon type sealing arrangement, in which the tenon of the metal seal ring is tightly fitted into the mortise of the connecting pipe.

[0048] In use, the connecting pipe sealing improvement

[0049] Based on the device of Embodiment 1, the connecting pipe between the high-boiling impurity removal liquid-solid separator 5 and the condensation tower bottom pump 2 and the high-boiling cracking device 3 is improved in sealing, and an alloy material with high temperature resistance and corrosion resistance is selected to manufacture the metal seal ring. The size of the metal seal ring should be accurately designed and processed according to the specification of the connecting pipe to ensure the fit of the metal seal ring with the pipe.

[0050] A mortise and tenon structure matching the metal seal ring is processed at both ends of the connecting pipe, the tenon of the metal seal ring is accurately inserted into the mortise of the connecting pipe, and then the connecting pipe is connected together by bolt fastening or other suitable connecting methods. During the fastening process, the metal seal ring should be uniformly pressed to achieve good sealing effect. At the same time, the sealing performance of the connecting part is tested, such as pressure test or helium leak detection, to ensure no leakage.

[0051] Working principle:

[0052] Material processing process: After the residue is discharged from the synthesis device, the material enters the condensation tower body 1 through the residue inlet pipeline 6. Under the action of the heat provided by the condensation tower reboiler 4, the material is separated in the condensation tower body 1, the liquid part rises, and the solid part settles. The condensation tower bottom pump 2 extracts and transports the mixture of chlorosilane containing silicon powder and high-boiling substances at the bottom to the high-boiling impurity removal liquid-solid separator 5. In the liquid-solid separator 5, the material passes through the filter core, the solid particles (such as silicon powder) are intercepted by the filter core, and the chlorosilane and high-boiling liquid continue to flow through the filter core pores, thereby realizing solid-liquid separation and reducing the solid content of chlorosilane. The low solid content chlorosilane and high-boiling substances after liquid-solid separation enter the high-boiling cracking device 3 from the outlet of the liquid-solid separator 5 for cracking reaction.

[0053] The material discharged from the top of the condensation tower body 1 enters the discharge pipeline 7, and is first cooled by the condensation tower air cooler 10. The cooled material enters the condensation tower reflux tank 9. In the reflux tank 9, part of the material is extracted by the condensation tower reflux pump 8 through the overhead extraction pipeline 11 as a product or further processing raw material. Another part of the material is refluxed to the discharge pipeline 7 through the auxiliary pipeline 12 for continuous circulation treatment to improve the treatment effect of the material and the quality of the product.

[0054] Liquid-solid separation principle: The filter core of the high-boiling impurity removal liquid-solid separator 5 has a specific pore size and structure, which is smaller than the particle size of solid particles (silicon powder, etc.). When the mixture containing silicon powder and chlorosilane with high-boiling substances enters the liquid-solid separator 5, under the action of pressure difference, the liquid part can pass through the pores of the filter core, while the solid particles are intercepted on the surface of the filter core to form a filter cake. With the continuous progress of the filtration process, the filter cake gradually thickens, and the filtration resistance increases, resulting in a decrease in filtration efficiency. At this time, backwashing operation is carried out through the backwashing assembly of the filter core.

[0055] Backwashing principle: When backwashing, start the backwashing pump 14, and the backwashing pump 14 delivers backwashing liquid (such as water or special cleaning solvent) to the backwashing pipeline 13 at a certain pressure. The backwashing control valve 15 is opened according to the set program or manual control, and the backwashing liquid is reversed through the filter core to wash away the filter cake on the surface of the filter core, so as to restore the filtration capacity of the filter core. The backwashing wastewater is discharged through a special drainage pipeline and collected for treatment.

[0056] Concentration tower body operation principle: The concentration tower body 1 controls the internal operating pressure between 0.2-0.5 MPa and the operating temperature between 80-120℃, uses the influence of pressure and temperature on the physical properties (such as boiling point, solubility, etc.) of the material to promote the separation of the material. In this pressure and temperature range, the boiling point of the liquid material is relatively low, and it is easier to volatilize and rise, while the solid particles are more likely to settle, thereby achieving the effect of solid-liquid separation. At the same time, stable pressure and temperature conditions also help to improve the operation stability and processing efficiency of the entire device.

[0057] High-boiling cracking device working principle: The high-boiling cracking device 3 can reduce the activation energy of the cracking reaction under the condition of the set cracking reaction temperature (200-300℃) and reaction pressure (0.5-1.0 MPa), promote the bond breaking of high-boiling molecules, and occur cracking reaction. High-boiling molecules are decomposed into small molecules of chlorosilane and other recyclable substances under the action of the catalyst, thereby realizing the recycling of high-boiling substances and improving the resource utilization rate and economic benefit of the entire process.

[0058] In this application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixed", and similar terms should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances. In this application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicates that the horizontal height of the first feature is less than that of the second feature. In the description of the specification, the description of the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the application. In this specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0059] Although the embodiments of the application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the application.

Claims

1. An apparatus for recovering high-boiling-point substances and reducing solid content in a concentration tower, comprising a concentration tower body (1), a concentration tower bottom pump (2), and a high-boiling-point cracking device (3), characterized in that: The bottom of the concentration tower body (1) is connected to the concentration tower reboiler (4), the inlet end of the concentration tower bottom pump (2) is connected to the bottom of the concentration tower reboiler (4), and the outlet end is connected to the high boiling point impurity removal liquid-solid separator (5). The outlet end of the high boiling point impurity removal liquid-solid separator (5) is connected to the inlet end of the high boiling point cracking device (3). The concentration tower body (1) is connected to a slag inlet pipe (6) on one side and a discharge pipe (7) on the top. The discharge pipe (7) is equipped with a circulation processing component.

2. The apparatus for recovering high-boiling-point substances and reducing solid content in a concentration tower according to claim 1, characterized in that, The circulating processing assembly includes a thickening tower reflux pump (8), a thickening tower reflux tank (9), a thickening tower air cooler (10), and a tower top outlet pipeline (11). The thickening tower air cooler (10) is connected in series to the outlet pipeline (7). The outlet end of the thickening tower air cooler (10) is connected to the top inlet end of the thickening tower reflux tank (9). The bottom outlet end of the thickening tower reflux tank (9) is connected to the inlet end of the thickening tower reflux pump (8). The outlet end of the thickening tower reflux pump (8) is connected to the tower top outlet pipeline (11). An auxiliary pipeline (12) is connected to the top of the thickening tower reflux tank (9) and the outlet pipeline (7).

3. The apparatus for recovering high-boiling-point substances and reducing solid content in a concentration tower according to claim 1, characterized in that, The high-boiling-point impurity removal liquid-solid separator (5) also includes a filter element backwashing assembly, which includes a backwashing line (13), a backwashing pump (14), and a backwashing control valve (15). The backwashing line (13) is connected to the filter element inside the high-boiling-point impurity removal liquid-solid separator (5), and the backwashing pump (14) and the backwashing control valve (15) are connected to the backwashing line (13).

4. The apparatus for recovering high-boiling-point substances and reducing solid content in a concentration tower according to claim 1, characterized in that, The connecting pipe between the high-boiling impurity removal liquid-solid separator (5), the concentrate tower bottom pump (2), and the high-boiling cracking device (3) adopts a metal sealing ring connection structure, and the metal sealing ring is made of high-temperature resistant and corrosion-resistant alloy material.

5. The apparatus for recovering high-boiling-point substances and reducing solid content in a concentration tower according to claim 4, characterized in that, The metal sealing ring connection structure adopts a tenon-groove sealing setting, in which the tenon of the metal sealing ring fits tightly with the groove of the connecting pipe.

6. The apparatus for recovering high-boiling-point substances and reducing solid content in a concentration tower according to claim 1, characterized in that, The main body (1) of the concentration tower is made of carbon steel lined with polytetrafluoroethylene, and the thickness of the polytetrafluoroethylene lining layer is 3-5 mm.

7. The apparatus for recovering high-boiling-point substances and reducing solid content in a concentration tower according to claim 1, characterized in that, The internal operating pressure of the concentration tower body (1) is controlled between 0.2-0.5MPa, and the operating temperature is controlled between 80-120℃.

8. The apparatus for recovering high-boiling-point substances and reducing solid content in a concentration tower according to claim 1, characterized in that, The pyrolysis reaction temperature in the high-boiling pyrolysis device (3) is controlled between 200-300℃, the reaction pressure is controlled between 0.5-1.0MPa, and a catalyst is added during the pyrolysis reaction. The catalyst is a transition metal oxide catalyst, and the amount added is 0.5%-2% of the high-boiling mass.

Images