Raw material drying and dehydrating device
By designing a raw material drying and dehydration device containing alumina desiccant and automatic control system, the problem of reduced reaction effect and freezing of cold box caused by excessive moisture content in the raw material is solved, and efficient dehydration and reaction effect are improved.
Patent Information
- Application Number
- CN202421827640.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-07-31
AI Technical Summary
In the petrochemical industry, excessive moisture content in raw materials will reduce the reaction effect, resulting in the problem of freezing and blocking of cold boxes at low temperatures.
A raw material drying and dehydration device is designed, including two parallel feed dryers, each with an alumina desiccant in it, which automatically switches and regeneration modes through the PLC controller, and uses a heater and condenser to ensure an efficient dehydration process.
It effectively reduces the moisture content in the raw materials, improves the reaction effect, prevents the freezing and blocking of cold boxes at low temperatures, and extends the service life of the adsorbent.
Smart Images
Figure CN222829362U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of drying and dehydrating devices, in particular to a raw material drying and dehydrating device. Background Art
[0002] In the petrochemical industry, the PDH (propane dehydrogenation) unit is an important process equipment for converting propane into propylene. Propylene is a key chemical raw material used to produce polypropylene, acrylonitrile, propylene oxide and a variety of other chemical products. With the growing global demand for propylene, more and more companies are using PDH technology for propylene production. The raw material propane undergoes a dehydrogenation reaction at 630°C in the presence of a catalyst to produce propylene and hydrogen as well as a small amount of side reactions. At the same time, due to the reduction of the catalyst and the presence of oxygenated substances in the raw materials, there will also be trace amounts of water in the reaction products.
[0003] At present, when propane is converted into propylene, the raw materials will also contain a certain amount of water. The maximum allowable water content in the feed is 1wtppm. Therefore, there are the following disadvantages: when the moisture content in the raw materials is too high, the reaction effect is reduced, resulting in ice and freezing at the low temperature of the cold box. Utility Model Content
[0004] The utility model aims to provide a raw material drying and dehydrating device to solve the problem that when the moisture content in the raw material is too high, the reaction effect is reduced, resulting in ice and freezing at low temperature in the cold box.
[0005] In order to achieve the above-mentioned purpose of the utility model, the utility model adopts the following technical scheme: a raw material drying and dehydration device, including a raw material pretreatment unit, the raw material pretreatment unit is fixed on the top surface of the platform, a first feed dryer is fixed on the top surface of the platform, a PLC controller is fixed on the front side of the raw material pretreatment unit, a second feed dryer is fixed on the top surface of the platform, alumina desiccant is respectively provided inside the first feed dryer and the second feed dryer, a three-way pipe is connected and fixed between the first feed dryer and the second feed dryer, two air intake valves are provided inside the three-way pipe, and the air intake valve is electrically connected to the PLC controller, the first feed dryer and the second feed dryer are respectively connected and fixed on the left side of the outer wall with conveying pipes, the two conveying pipes are respectively connected and fixed to the raw material pretreatment unit, and the two conveying pipes are respectively provided inside with air outlet valves, and the air outlet valves are electrically connected to the PLC controller.
[0006] Preferably, the top surfaces of the two conveying pipes are respectively provided with mounting holes, and humidity sensors are respectively fixed inside the two mounting holes, and the humidity sensors are electrically connected to the PLC controller.
[0007] Preferably, two heaters are fixed on the top surface of the platform, and the heaters are electrically connected to the PLC controller. Connecting pipes are respectively connected and fixed between the two heaters and the two conveying pipes, and first valves are respectively provided inside the two connecting pipes, and the first valves are electrically connected to the PLC controller. Mounting pipes are respectively connected and fixed on the left side of the outer walls of the first feed dryer and the second feed dryer, and the two mounting pipes are respectively connected and fixed to the two heaters, and second valves are respectively provided inside the two mounting pipes, and the second valves are electrically connected to the PLC controller.
[0008] Preferably, flow valves are respectively provided inside the two installation pipes, and the flow valves are electrically connected to the PLC controller.
[0009] Preferably, the top surfaces of the two mounting tubes are respectively provided with fixing holes, and temperature sensors are respectively fixed inside the two fixing holes, and the temperature sensors are electrically connected to the PLC controller.
[0010] Preferably, two condensers are fixed on the top surface of the platform, and fixed pipes are respectively connected and fixed to the outer sides of the first feed dryer and the second feed dryer, and the two fixed pipes are respectively connected and fixed to the two condensers, and third valves are respectively provided inside the two fixed pipes, and the third valves are electrically connected to the PLC controller.
[0011] Compared with the prior art, a raw material drying and dehydration device adopting the above technical solution has the following advantages:
[0012] Beneficial effects:
[0013] 1. In use, the first feed dryer, the second feed dryer and the alumina desiccant are mainly used to remove water from the raw materials, improve the reaction effect, prevent ice and freezing at low temperatures in the cold box, and improve the adsorption capacity of the adsorbent to improve the adsorption effect and extend the service life. The first feed dryer is connected in parallel with the second feed dryer to ensure the continuity and flexibility of the production process;
[0014] 2. During use, when it is detected that the alumina desiccant in the working first feed dryer is close to saturation, the control system will automatically switch to the standby second feed dryer, and switch the original working first feed dryer to the regeneration mode. Use the fresh propane without water at the outlet of the first feed dryer as the regeneration medium, heat the propane to the appropriate regeneration temperature through the heater. The specific heating temperature depends on the characteristics of the alumina desiccant. Open the first valve of the regeneration medium, and pass the heated propane into the first feed dryer to be regenerated. The heated propane gas flows through the alumina desiccant in the first feed dryer, carrying away the moisture adsorbed on the alumina desiccant.
[0015] 3. During use, the flow valve is used to control the flow inside the installation pipe, and the automatic control system is used to adjust the flow of the regeneration medium to ensure that the regeneration process is carried out efficiently while avoiding insufficient flow of the regeneration medium. The temperature sensor is used to detect the temperature of the heated propane in real time, and then the information is transmitted to the PLC controller. The temperature of the regeneration medium is adjusted through the automatic control system to ensure that the regeneration process is carried out efficiently while avoiding overheating of the alumina desiccant. During the regeneration process, the water-containing propane exhaust gas is cooled by the condenser to separate the water from the propane. The dehydrated propane can be processed and then re-entered into the regeneration system for recycling, or discharged according to specific conditions. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a three-dimensional schematic diagram of an embodiment.
[0017] Figure 2 It is an exploded schematic diagram of an embodiment.
[0018] Figure 3 It is a schematic diagram of the explosion of the delivery pipe and the installation pipe in the embodiment.
[0019] Figure 4 For example Figure 2 Enlarged schematic diagram at point A in the middle.
[0020] In the figure: 1. Raw material pretreatment unit; 2. Platform; 3. First feed dryer; 4. Second feed dryer; 5. Alumina desiccant; 6. Tee pipe; 7. Inlet valve; 8. Delivery pipe; 9. Exit valve; 10. Mounting hole; 11. Humidity sensor; 12. Heater; 13. Connecting pipe; 14. First valve; 15. Mounting pipe; 16. Second valve; 17. Flow valve; 18. Fixing hole; 19. Temperature sensor; 20. Condenser; 21. Fixing pipe; 22. Third valve. DETAILED DESCRIPTION
[0021] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.
[0022] like Figure 1-Figure 4As shown, a raw material drying and dehydration device includes a raw material pretreatment unit 1, which is fixed on the top surface of a platform 2, a first feed dryer 3 is fixed on the top surface of the platform 2, a PLC controller is fixed on the front side of the raw material pretreatment unit 1, a second feed dryer 4 is fixed on the top surface of the platform 2, alumina desiccant 5 is respectively arranged inside the first feed dryer 3 and the second feed dryer 4, a three-way pipe 6 is connected and fixed between the first feed dryer 3 and the second feed dryer 4, two air intake valves 7 are arranged inside the three-way pipe 6, and the air intake valve 7 is electrically connected to the PLC controller, and conveying pipes 8 are respectively connected and fixed on the left sides of the outer walls of the first feed dryer 3 and the second feed dryer 4, and the two conveying pipes 8 are respectively connected and fixed to the raw material pretreatment unit 1, and the two conveying pipes 8 are respectively arranged inside the two conveying pipes 8, and the air outlet valves 9 are electrically connected to the PLC controller.
[0023] During use, the staff first fills the first feed dryer 3 and the second feed dryer 4 with alumina desiccant 5 respectively, the function of which is to remove water from the raw material, and to improve the adsorption effect by increasing the adsorption capacity of the adsorbent. Two dryers are set, namely the first feed dryer 3 and the second feed dryer 4, one of which is normally in operation and the other is regenerated or on standby. For example, the first feed dryer 3 is in operation and the second feed dryer 4 is regenerated or on standby. When the test result shows that the adsorbent is saturated with adsorption, the running first feed dryer 3 can be cut out for regeneration, and the standby second feed dryer 4 can be cut into the system.
[0024] The first feed dryer 3, the second feed dryer 4 and the alumina desiccant 5 are mainly used to remove water from the raw materials, thereby improving the reaction effect and preventing freezing and blocking at low temperatures in the cold box. The adsorption capacity of the adsorbent is increased to improve the adsorption effect and extend the service life. The first feed dryer 3 and the second feed dryer 4 are connected in parallel to ensure the continuity and flexibility of the production process.
[0025] like Figure 1-Figure 4 As shown, the top surfaces of the two conveying pipes 8 are respectively provided with mounting holes 10 , and humidity sensors 11 are respectively fixed inside the two mounting holes 10 , and the humidity sensors 11 are electrically connected to the PLC controller.
[0026] During use, the humidity sensor 11 is used to detect the moisture content in the gas inside the delivery pipe 8 in real time. When the moisture content exceeds the set value, it means that the alumina desiccant 5 has been adsorbed to saturation. For example, when the delivery pipe 8 of the first feed dryer 3 detects adsorption saturation, the information is transmitted to the PLC controller, the front air intake valve 7 is closed, and the rear air intake valve 7 is opened. When it is detected that the alumina desiccant 5 in the working first feed dryer 3 is close to saturation, the control system will automatically switch to the spare second feed dryer 4, and switch the original working first feed dryer 3 to regeneration mode.
[0027] like Figure 1-Figure 4 As shown, two heaters 12 are fixed on the top surface of the platform 2, and the heaters 12 are electrically connected to the PLC controller. Connecting pipes 13 are respectively connected and fixed between the two heaters 12 and the two conveying pipes 8, and first valves 14 are respectively provided inside the two connecting pipes 13, and the first valves 14 are electrically connected to the PLC controller. Mounting pipes 15 are respectively connected and fixed on the left side of the outer wall of the first feed dryer 3 and the second feed dryer 4, and the two mounting pipes 15 are respectively connected and fixed to the two heaters 12, and second valves 16 are respectively provided inside the two mounting pipes 15, and the second valve 16 is electrically connected to the PLC controller. Flow valves 17 are respectively provided inside the two mounting pipes 15, and the flow valves 17 are electrically connected to the PLC controller.
[0028] In use, fresh propane without water at the outlet of the first feed dryer 3 is used as the regeneration medium, and the propane is heated to an appropriate regeneration temperature through the heater 12. The specific heating temperature is determined according to the characteristics of the alumina desiccant 5. The first valve 14 of the regeneration medium is opened, and the heated propane is passed into the first feed dryer 3 to be regenerated. The heated propane gas flow passes through the alumina desiccant 5 in the first feed dryer 3, carrying away the moisture adsorbed on the alumina desiccant 5. The flow valve 17 is used to control the flow inside the installation pipe 15, and the flow of the regeneration medium is adjusted by the automatic control system to ensure the efficient regeneration process and avoid insufficient flow of the regeneration medium.
[0029] like Figure 1-Figure 4 As shown, the top surfaces of the two mounting tubes 15 are respectively provided with fixing holes 18, and the insides of the two fixing holes 18 are respectively fixed with temperature sensors 19, and the temperature sensor 19 is electrically connected to the PLC controller. Two condensers 20 are fixed to the top surface of the platform 2, and the outer sides of the first feed dryer 3 and the second feed dryer 4 are respectively connected and fixed with fixing tubes 21, and the two fixing tubes 21 are respectively connected and fixed to the two condensers 20, and the insides of the two fixing tubes 21 are respectively provided with third valves 22, and the third valve 22 is electrically connected to the PLC controller.
[0030] In use, the temperature sensor 19 is used to detect the temperature of the heated propane in real time, and then the information is transmitted to the PLC controller, and the temperature of the regeneration medium is adjusted through the automatic control system to ensure the efficient regeneration process and avoid overheating of the alumina desiccant 5. During the regeneration process, the water-containing propane exhaust gas is cooled by the condenser 20 to separate the water from the propane. The dehydrated propane can be processed and then re-entered into the regeneration system for recycling, or discharged according to specific conditions.
[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A raw material drying and dehydration device, comprising a raw material pretreatment unit (1), wherein the raw material pretreatment unit (1) is fixed on the top surface of a platform (2), characterized in that: A first feed dryer (3) is fixed on the top surface of the platform (2), a PLC controller is fixed on the front side of the raw material pretreatment unit (1), a second feed dryer (4) is fixed on the top surface of the platform (2), alumina desiccant (5) is respectively arranged inside the first feed dryer (3) and the second feed dryer (4), a three-way pipe (6) is connected and fixed between the first feed dryer (3) and the second feed dryer (4), two air inlet valves (7) are arranged inside the three-way pipe (6), and the air inlet valves (7) are electrically connected to the PLC controller, and conveying pipes (8) are respectively connected and fixed on the left side of the outer wall of the first feed dryer (3) and the second feed dryer (4), the two conveying pipes (8) are respectively connected and fixed to the raw material pretreatment unit (1), and air outlet valves (9) are respectively arranged inside the two conveying pipes (8), and the air outlet valves (9) are electrically connected to the PLC controller.
2. A raw material drying and dehydration device according to claim 1, characterized in that: The top surfaces of the two conveying pipes (8) are respectively provided with mounting holes (10), and humidity sensors (11) are respectively fixed inside the two mounting holes (10), and the humidity sensors (11) are electrically connected to the PLC controller.
3. A raw material drying and dehydration device according to claim 2, characterized in that: Two heaters (12) are fixed on the top surface of the platform (2), and the heaters (12) are electrically connected to the PLC controller. Connecting pipes (13) are respectively connected and fixed between the two heaters (12) and the two conveying pipes (8), and first valves (14) are respectively provided inside the two connecting pipes (13), and the first valves (14) are electrically connected to the PLC controller. Mounting pipes (15) are respectively connected and fixed on the left side of the outer wall of the first feed dryer (3) and the second feed dryer (4), and the two mounting pipes (15) are respectively connected and fixed to the two heaters (12), and second valves (16) are respectively provided inside the two mounting pipes (15), and the second valves (16) are electrically connected to the PLC controller.
4. A raw material drying and dehydration device according to claim 3, characterized in that: A flow valve (17) is provided inside each of the two installation pipes (15), and the flow valve (17) is electrically connected to the PLC controller.
5. A raw material drying and dehydrating device according to claim 3, characterized in that: The top surfaces of the two mounting tubes (15) are respectively provided with fixing holes (18), and temperature sensors (19) are respectively fixed inside the two fixing holes (18), and the temperature sensors (19) are electrically connected to the PLC controller.
6. A raw material drying and dehydrating device according to claim 5, characterized in that: Two condensers (20) are fixed on the top surface of the platform (2); fixed pipes (21) are respectively connected and fixed to the outsides of the first feed dryer (3) and the second feed dryer (4); the two fixed pipes (21) are respectively connected and fixed to the two condensers (20); third valves (22) are respectively provided inside the two fixed pipes (21); and the third valves (22) are electrically connected to the PLC controller.