Carclazyte tower for coupling first-stage and second-stage crude benzene hydrogenation materials
By designing the first and second phase crude benzene hydrogenation materials coupling white clay tower in chemical equipment, adopting a white clay pallet and heavy ring structure, and increasing the working temperature of the white clay tower in the white clay tower through heating medium, the problems of reducing activity of the white clay tower and fault parking are solved, and the continuous production and the convenience of temperature control are achieved.
Patent Information
- Application Number
- CN202421741240.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-22
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-07-22
AI Technical Summary
In existing chemical equipment, the activity and adsorption capacity of the white clay towers are reduced during use, resulting in the need to increase the inlet temperature to meet production requirements, and parking inspection is required in case of failure, affecting production continuity.
A white clay tower for coupling of first and second phase crude benzene hydrogenation materials was designed, using a white clay pallet and heavy ring structure, and the working temperature of the white clay in the white clay tower was increased by heating medium to achieve the maintenance of the catalytic activity of the white clay. At the same time, a backup pipeline for feeding of first and second phases of hydrogenation oil is set up to allow the hydrogenation oil to be transferred into a normal white soil tower for treatment when the white soil tower fails.
By increasing the working temperature of the white soil in the white soil tower, the reduction of the activity of the white soil is delayed, the dependence on the inlet temperature is reduced, the convenience of temperature control is improved, and the smooth transfer and treatment of hydrogenation oil is achieved when the white soil tower fails, ensuring the continuity of production.
Smart Images
Figure CN222846672U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of chemical equipment, in particular to a white clay tower for coupling first-stage and second-stage crude benzene hydrogenation materials. Background Art
[0002] The processes for producing aromatic hydrocarbons from petroleum as raw materials all use hydrogenation processes, and the processes for producing aromatic hydrocarbons from coking crude benzene as raw materials include pickling refining and hydrogenation refining. Crude benzene hydrogenation refining is to partially remove sulfur, nitrogen and unsaturated hydrocarbons contained in crude benzene through hydrogenation, and then obtain high-purity pure benzene, pure toluene, xylene and other products through extraction, separation and refining. However, the hydrogenated oil obtained from the hydrogenation section of crude benzene also contains trace olefin impurities, which will affect the pickling colorimetry of aromatic products and produce undesirable by-products such as colored substances in benzenesulfonic acid products during downstream processing. Therefore, a white clay tower is set in front of the benzene, toluene and xylene separation system of the aromatic unit for refining to eliminate the adverse effects of the above-mentioned unsaturated hydrocarbons. In the existing device, the first-stage hydrogenated oil delivery pipeline and the second-stage hydrogenated oil delivery pipeline are independent. When a fault occurs in the first-stage bleaching clay tower or the second-stage bleaching clay tower, it is necessary to stop and check; the working condition of the bleaching clay tower is 150-200°C. The existing bleaching clay tower is preheated before the hydrogenated oil enters the bleaching clay tower inlet. When the bleaching clay tower starts to operate, the bleaching clay is fresh and has strong activity and adsorption capacity. It can be operated at 150°C to produce aromatics that meet quality requirements. As the use time of the bleaching clay tower increases, the activity and adsorption capacity of the bleaching clay will weaken, and it is necessary to increase the inlet temperature to meet production requirements. If the temperature is directly increased before the inlet, temperature control is inconvenient and higher requirements are placed on the heater. Utility Model Content
[0003] In view of this, the utility model provides a white clay tower for coupling the first-stage and second-stage crude benzene hydrogenation materials.
[0004] The technical solution adopted by the utility model to solve its technical problems is:
[0005] A kaolin tower for coupling first-stage and second-stage crude benzene hydrogenation materials, the kaolin tower is arranged between a hydrogenation oil feed pipeline and a hydrogenation oil discharge pipeline, the hydrogenation oil feed pipeline is also provided with a first-stage and second-stage hydrogenation oil feed standby pipeline, the kaolin tower comprises a tower body, a feed port connected to the hydrogenation oil feed pipeline and a discharge port connected to the hydrogenation oil discharge pipeline, the tower body is cylindrical and installed on a tower base, characterized in that the tower body consists of a tower cover and a tower body, a pressurizing port is arranged on the tower cover, a heating medium feed pipe is arranged on one side of the tower body, and a heating medium discharge pipe is arranged on the other side, a heavy ring is arranged in the tower body, a kaolin tray is arranged on the heavy ring, the kaolin tray is in the shape of a round barrel with an opening upward, a hollow cavity is arranged at the bottom, a plurality of holes are arranged in the hollow cavity, and kaolin is filled in the kaolin tray.
[0006] Furthermore, a heating medium inlet is provided on one side of the clay tray, and a heating medium outlet is provided on the other side, the heating medium inlet is connected to a heating medium inlet pipe, and the heating medium outlet is connected to a heating medium outlet pipe.
[0007] Furthermore, a number of the holes are uniformly selected, and temperature sensors are arranged in the selected holes to measure the temperature of the hydrogenated oil liquid flowing through the holes.
[0008] Furthermore, a plurality of reinforcing ribs are symmetrically arranged on the heavy ring.
[0009] Furthermore, the side projection of the reinforcing ribs is a triangle, and the number of the reinforcing ribs is 6 to 8.
[0010] Furthermore, the upper ring surface of the heavy ring is stepped, and is divided into an inner ring and an outer ring. The bottom surfaces of the inner ring and the outer ring are flat, the thickness of the outer ring is greater than that of the inner ring, and the inner ring is recessed on the outer ring.
[0011] Furthermore, the upper end surface of the second baffle is a plane, and the lower end is a curved surface. The outer diameter R1 of the bottom surface of the clay tray is greater than the inner diameter R1 of the heavy ring 215. 内 , smaller than the outer diameter R of the heavy ring 外 .
[0012] Furthermore, the R1-R 内 The value is 0.4 to 0.6 times (R 外 -R 内 )value.
[0013] Furthermore, the white clay is wrapped with a stainless steel wire mesh.
[0014] Furthermore, an electronic valve is provided on the heating medium inlet pipe, and the electronic valve is electrically connected to the temperature sensor.
[0015] The beneficial effects of the utility model are:
[0016] The utility model provides a kaolin tower for coupling first-phase and second-phase crude benzene hydrogenation materials. The kaolin tower is arranged between a hydrogenation oil feed pipeline and a hydrogenation oil discharge pipeline. The hydrogenation oil feed pipeline is also provided with a first-phase and second-phase hydrogenation oil feed standby pipeline. The kaolin tower comprises a tower body, a feed port connected to the hydrogenation oil feed pipeline and a discharge port connected to the hydrogenation oil discharge pipeline. The tower body is installed on a tower base. The tower body consists of a tower cover and a tower body. A pressurizing port is arranged on the tower cover. A heating medium feed pipe is arranged on one side of the tower body, and a heating medium discharge pipe is arranged on the other side. A heavy ring is arranged in the tower body. A kaolin tray is arranged on the heavy ring. The kaolin tray is in the shape of a round barrel with an opening upward, a hollow cavity is arranged at the bottom, a plurality of holes are arranged in the hollow cavity, and kaolin is filled in the kaolin tray. When any of the first or second phase bleaching clay towers fails, the hydrogenated oil in that phase can be transferred to a normal bleaching clay tower for treatment through the first and second phase hydrogenated oil feed spare pipelines. According to the process parameter requirements, a heating medium can be introduced into the hollow cavity provided on the bleaching clay tray to increase the working temperature of the bleaching clay in the bleaching clay tower body and achieve catalytic activity of the bleaching clay. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0018] Figure 1 It is a structural schematic diagram of a white clay tower for coupling the first-stage and second-stage crude benzene hydrogenation materials of the utility model;
[0019] Figure 2 It is another structural schematic diagram of the first-stage and second-stage crude benzene hydrogenation material coupling white clay tower of the utility model;
[0020] Figure 3 It is a top view of the first-stage and second-stage crude benzene hydrogenation material coupling white clay tower of the utility model;
[0021] Figure 4 for Figure 3 Section view along AA;
[0022] Figure 5 This is a schematic diagram of the structure of the clay tray in the utility model;
[0023] Figure 6 This is a schematic diagram of a heavy ring structure in one embodiment of the present utility model;
[0024] In the figure: 1. Hydrogenated oil feed pipeline; 2. White clay tower; 21. Tower body; 211. Tower cover; 2111. Pressurization port; 212. Tower body; 2121. Heating medium inlet pipe; 2122. Heating medium outlet pipe; 213. Bolts; 214. White clay tray; 2141. Inlet; 2142. Outlet; 2143. Hollow cavity; 2144. Holes; 215. Heavy ring; 2151. Reinforcement ribs; 2152. Inner ring; 2153. Outer ring; 22. Feed port 22; 23. Discharge port; 23; 3. Hydrogenated oil discharge pipeline; 4. Standby feed pipeline for hydrogenated oil for phases I and II. DETAILED DESCRIPTION
[0025] Now the utility model is described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the utility model in a schematic manner, so it only shows the components related to the utility model.
[0026] The first and second phases of crude benzene hydrogenation are the same production line, with the same production equipment and product specifications. Figure 1-5 As shown, the utility model provides a first-phase and second-phase crude benzene hydrogenation material coupling kaolin tower 200, which is arranged between a hydrogenation oil feed pipeline 1 and a hydrogenation oil discharge pipeline 3. The hydrogenation oil feed pipeline 1 is also provided with a first-phase and second-phase hydrogenation oil feed standby pipeline 4. The kaolin tower 2 includes a tower body 21, a feed port 22 connected to the hydrogenation oil feed pipeline 1, and a discharge port 23 connected to the hydrogenation oil discharge pipeline 3. The tower body 21 is cylindrical and installed on a tower base 24. A tower cover 211 and a tower body 212 are provided on the tower body 21. The tower cover 211 is fixed to the tower body 212 by a plurality of bolts 213. A pressurizing port 2111 is provided on the tower cover 211. A heating medium inlet pipe 2121 is provided on one side of the tower body 212, and a heating medium outlet pipe 2122 is provided on the other side. A plurality of heavy rings 215 are provided inside the tower body. The heavy rings 215 are annular and are arranged along the mid-vertical line of the tower body 212. Evenly distributed, a clay tray 214 is provided on the heavy ring 215, and the clay tray 214 is in the shape of a round barrel with an opening upward. Clay wrapped by a stainless steel wire mesh is placed in the clay tray 214, and the bottom of the clay tray 214 is a hollow cavity 2143, and a heating medium inlet 2141 and a heating medium outlet 2142 are respectively provided on both sides. The heating medium inlet 2141 is connected to the heating medium inlet pipe 2121, and the heating medium outlet 2142 is connected to the heating medium outlet pipe 2122. A plurality of holes 2144 for hydrogenated oil liquid to flow through are provided in the hollow cavity 2143, and a plurality of holes 2144 are evenly selected, and a temperature sensor (not shown in the figure) is arranged in the selected hollow hole 2144 to detect the temperature of the hydrogenated oil flowing through. The hole 2144 is tubular, and the tube wall is closed, which can prevent the hydrogenated oil liquid from flowing into the hollow cavity 2143.
[0027] The heating medium can be steam or heat transfer oil, and heat transfer oil is preferred because if steam is used, heating the clay tray to 150-200°C requires a higher steam pressure, which requires a relatively high pressure resistance of the hollow cavity 2143. If heat transfer oil is used as the heating medium, there will be no such problem.
[0028] The contact surface between the clay tray 214 and the heavy ring 215 is a smooth surface. When installed, a high temperature resistant and oil resistant gasket (not shown in the figure) is placed between the two surfaces. The heavy ring 215 is welded to the inner wall of the tower body 212. The outer diameter R1 of the bottom surface of the clay tray 214 is larger than the inner diameter R 内 , smaller than the outer diameter R of the heavy ring 215 外 , preferably R1-R 内 The value is 0.4 to 0.6 times (R 外 -R 内 If the outer diameter R1 of the bottom surface of the clay tray 214 is too small, the contact surface with the heavy ring 215 is too small, and there is a risk of failure to support. If the outer diameter R1 of the bottom surface of the clay tray 214 is too large, the distance between the clay tray 214 and the tower body 212 is too small, and the installation operation space is too small, which is not conducive to the fixed construction of the clay tray 214 and the heavy ring 215.
[0029] In some embodiments, the lower ring surface of the heavy ring 215 is provided with a plurality of reinforcing ribs 2151, and the side projection of the reinforcing ribs 2151 is triangular, with one base fixed to the ring surface of the heavy ring 215, and the other base fixed to the tower body 21, and evenly distributed on the heavy lower ring surface. The number of the reinforcing ribs 2151 is preferably 6 to 8.
[0030] In some embodiments, the upper annular surface of the heavy ring 215 is stepped, such as Figure 6 As shown, the heavy ring 215 is divided into an inner ring 2152 and an outer ring 2153. The bottom surfaces of the inner ring 2152 and the outer ring 2153 are flat, and the thickness of the inner ring 2152 is less than that of the outer ring 2153. Looking from top to bottom, the inner ring 2152 is recessed on the outer ring 2153 to form a step-like shape with a low inside and a high outside. The outer diameter of the inner ring 2152 matches the outer diameter of the bottom surface of the clay tray 214. Specifically, the clay tray 214 can be placed on the inner ring 2152, and the outer ring 2153 can limit the clay tray 214 to prevent the clay tray 214 from moving in the horizontal direction. That is to say, the clay tray 214 can be snapped onto the heavy ring 215.
[0031] In some embodiments, an electronic valve (not shown) is provided on the heating medium inlet pipe, and the electronic valve is electrically connected to the temperature sensor in the hole 2144.
[0032] The working temperature of the first and second phase crude benzene hydrogenation material coupling bleaching clay tower 2 is 150-200°C. At a lower temperature (below 150°C), the catalytic activity is low and the index of removing unsaturated olefins in the hydrogenated oil cannot be reached. At a higher temperature (200°C), unsaturated olefins are easily polymerized to generate high-boiling tar substances that block the gaps of the bleaching clay and reduce the catalytic effect. However, even if it is operated at a lower temperature (150°C), the catalytic activity of the bleaching clay will decrease with the increase of the use time, and the temperature needs to be increased to improve the activity of the bleaching clay. Therefore, the working temperature of the bleaching clay tower 2 needs to be adjusted according to the operation conditions.
[0033] During normal operation, the hydrogenated oil is heated to 150°C after H2S and NH3 are removed, and then pressurized and flows into the feed port 22 through the hydrogenated oil feed pipeline 1. The tower body 1 is pressurized through the pressurizing port to maintain the pressure in the tower body between 0.15 and 0.25 MPA, which can ensure that the hydrogenated oil will not be vaporized at a temperature of 150 to 200°C. The hollow cavity of the clay tray 214 is pre-filled with a heating medium. When the clay tower 2 starts to operate, the temperature and flow rate of the heating medium are controlled, and the temperature of the temperature sensor in the hole 2144 on the clay tray 214 is controlled at 150 to 160°C. After a period of operation, the flow rate and temperature of the heating medium are adjusted according to the bromine value of the hydrogenated oil in the discharge port 23. If the bromine value increases, it means that the clay activity in the clay tower 2 is reduced. At this time, it is necessary to increase the working temperature in the clay tower 2. In conjunction with the temperature sensor in the hole 2144, this can be achieved by increasing the temperature and flow rate of the heating medium.
[0034] When any bleaching clay tower 2 in the first or second phase fails, the hydrogenated oil in the production line of the failed bleaching clay tower is merged into the normal production line 4 of the bleaching clay tower through the first and second phase hydrogenated oil feed spare pipelines. At this time, the processing capacity of the bleaching clay tower under normal operating conditions increases, and the working temperature can be increased through the bleaching clay tray to increase the activity of the bleaching clay to ensure that the treatment results meet the standards.
[0035] The technical solution disclosed by the utility model has the following characteristics: when any bleaching clay tower in the first or second phase fails, the hydrogenated oil in the first or second phase can be transferred to a normal bleaching clay tower for treatment through the first and second phase hydrogenated oil feed spare pipelines; according to the process parameter requirements, a heating medium can be introduced into the hollow cavity arranged on the bleaching clay tray to increase the working temperature of the bleaching clay in the tower body of the bleaching clay tower and achieve the catalytic activity of the bleaching clay.
[0036] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without departing from the scope of the utility model through the above description. The technical scope of this utility model is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.
Claims
1. A kaolin tower for coupling the first-stage and second-stage crude benzene hydrogenation materials, the kaolin tower is arranged between the hydrogenation oil feed pipeline and the hydrogenation oil discharge pipeline, the hydrogenation oil feed pipeline is also provided with a first-stage and second-stage hydrogenation oil feed standby pipeline, the kaolin tower comprises a tower body, a feed port connected to the hydrogenation oil feed pipeline and a discharge port connected to the hydrogenation oil discharge pipeline, the tower body is installed on a tower base, characterized in that, The tower body consists of a tower cover and a tower body, the tower cover is provided with a pressurizing port, one side of the tower body is provided with a heating medium feed pipe, and the other side is provided with a heating medium discharge pipe, a heavy ring is provided in the tower body, a clay tray is provided on the heavy ring, the clay tray is in the shape of a cylindrical body with an opening upward, a hollow cavity is provided at the bottom, a plurality of holes are provided on the hollow cavity, and clay is filled in the clay tray.
2. The first-stage and second-stage crude benzene hydrogenation material coupling bleaching clay tower according to claim 1, characterized in that: A heating medium inlet is provided on one side of the clay tray, and a heating medium outlet is provided on the other side. The heating medium inlet is connected to a heating medium inlet pipe, and the heating medium outlet is connected to a heating medium outlet pipe.
3. The first-stage and second-stage crude benzene hydrogenation material coupling bleaching clay tower according to claim 1 is characterized in that: A number of the holes are uniformly selected, and temperature sensors are arranged in the selected holes to measure the temperature of the hydrogenated oil liquid flowing through the holes.
4. The first-stage and second-stage crude benzene hydrogenation material coupling bleaching clay tower according to claim 1, characterized in that: A plurality of reinforcing ribs are symmetrically arranged on the heavy ring.
5. The first-stage and second-stage crude benzene hydrogenation material coupling white clay tower according to claim 4, characterized in that: The side projection of the reinforcing ribs is a triangle, and the number of the reinforcing ribs is 6 to 8.
6. The first-stage and second-stage crude benzene hydrogenation material coupling bleaching clay tower according to claim 1, characterized in that: The upper ring surface of the heavy ring is stepped and is divided into an inner ring and an outer ring. The bottom surfaces of the inner ring and the outer ring are flat, the thickness of the outer ring is greater than that of the inner ring, and the inner ring is concavely arranged on the outer ring.
7. The first-stage and second-stage crude benzene hydrogenation material coupling bleaching clay tower according to claim 1, characterized in that: The outer diameter R1 of the bottom surface of the clay tray is greater than the inner diameter R1 of the heavy ring 215. 内 , smaller than the outer diameter R of the heavy ring 外 .
8. The first-stage and second-stage crude benzene hydrogenation material coupling white clay tower according to claim 7, characterized in that: The R1-R 内 The value is 0.4 to 0.6 times (R 外 -R 内 )value.
9. The first-stage and second-stage crude benzene hydrogenation material coupling white clay tower according to claim 3, characterized in that: The white clay is wrapped with a stainless steel wire mesh.
10. The first-stage and second-stage crude benzene hydrogenation material coupling bleaching clay tower according to claim 2, characterized in that: An electronic valve is provided on the heating medium inlet pipe, and the electronic valve is electrically connected to the temperature sensor.