Under-pressure automatic continuous solid feeding process and method

Abstract

The invention provides a process and a method for automatically and continuously feeding solid under pressure, and discloses a two-stage bin structure, namely a feeding bin and a working bin (as shown in Figure 1), which are connected in series, so that the functions of feeding materials into the feeding bin under normal pressure and continuously and automatically feeding the materials in the working bin into a reactor under pressure are realized; the device is characterized in that the working bin always operates under the same pressure as the reactor, and can continuously and stably feed materials into the reactor under the pressure condition; the feeding bin intermittently and alternately works under the working conditions of pressure and normal pressure. The invention discloses an under-pressure continuous automatic controllable solid feeding device and method (as shown in Figure 2), the device is arranged at the bottom of a working bin, and the device is characterized in that solid materials are conveyed in a volume metering mode, a driving shaft drives a material shifting rod to rotate, and the materials in a material storage tank are pushed into a discharge port in the rotating direction and are uniformly fed into a reactor. A double-bin structure device (as shown in 9 and 26 in Figure 1) of a stock bin (a working stock bin and a feeding bin) and an equipment bin is invented, the sealing problem that the sealing pressure of a gas medium mechanical shaft is lower than 0.5 MPa is solved, the general reaction pressure condition is about 1 MPa, and the sealing pressure of the device on the gas medium can reach 3 MPa. According to the invention, continuous feeding and accurate control of the feeding amount of solid materials under the pressure condition in a continuous flow reaction process can be realized, and the problems that the existing pressure reaction in which a solid phase participates can only depend on an intermittent reaction or a liquid-solid reaction mode, continuous and accurate feeding of the solid under pressure cannot be realized, and continuous and stable flow is difficult are solved.

Description

Technical Field

[0001] This invention proposes a pressurized automatic continuous solid feeding process and method, which belongs to modern industrial fields such as chemical engineering, biomedicine, and materials engineering. Background Technology

[0002] In modern industrial fields such as chemical engineering, biomedicine, and materials engineering, with the continuous increase in process complexity and product performance requirements, the accuracy of raw material addition has become one of the key factors affecting process control and product quality stability. Especially in reactions involving insoluble solids, traditional processes employ intermittent manual or mechanical feeding and liquid-to-solid feeding methods. These feeding methods suffer from significant fluctuations during the feeding process, making precise metering impossible. Furthermore, most feeding methods cannot achieve continuous feeding of solid materials under pressure.

[0003] In addition, Chinese patent CN 120325113A discloses an insoluble solid powder feeding system and its usage method, mainly used to mix insoluble solid powder with water to form a mixed liquid and transport it to downstream devices. The feeding system includes a mixing container and a second water injection pipe connected to the mixing container, an overflow feeding pipe, and a mixing mechanism installed in the mixing container. During operation, the insoluble solid powder is added to the mixing container, the first water inlet valve is closed, the water injection volume controller is opened to start the water pump, and wastewater is injected into the mixing container through the second water injection pipe until the liquid level in the mixing container reaches the bottom of the outlet, at which point water injection is paused, and the mixing mechanism is activated to mix evenly and obtain a mixed liquid. When wastewater treatment is required, the water pump is started, the first water inlet valve and the water injection volume controller are opened to feed the mixed liquid. When treatment is completed, the water pump is turned off to stop feeding. This device can realize the transportation of solid materials, but it cannot achieve true continuous production. Furthermore, the feeding method of this device cannot achieve accurate metering of the fed solids. Summary of the Invention

[0004] 1. Purpose of the invention To achieve continuous feeding of solid materials under pressure and precise control of the feed rate in continuous flow reaction processes, and to solve the problem that existing pressurized reactions involving solid phases can only rely on intermittent reactions or liquid-solid reaction methods, which cannot achieve continuous and precise feeding of solids under pressure, this invention provides a pressurized automatic continuous solid feeding process and method. Summary of the Invention

[0005] To achieve the above objectives, the described pressurized automatic continuous solid feeding process and method utilizes a two-stage silo structure—a feeding silo and a working silo connected in series—to realize the functions of feeding material into the feeding silo at atmospheric pressure and continuously and automatically feeding material from the working silo into the reactor under pressure. The working silo operates at the same pressure as the reactor and can continuously and stably feed material into the reactor under pressurized conditions. The feeding silo operates intermittently, alternating between pressurized and atmospheric pressure conditions. Under atmospheric pressure conditions, the silo connecting valve is closed, and the pressure-holding feeding valve is open, allowing material to be fed into the feeding silo. Once feeding is complete, the pressure-holding feeding valve is closed. After material feeding, the pressurization valve is opened to pressurize the feeding silo until it matches the pressure of the raw material gas. At this point, the feeding silo is under pressurized conditions, and the feeding silo connecting valve is open, allowing material to be conveyed from the feeding silo into the working silo. After material conveying is complete, the silo connecting valve is closed, and the exhaust valve is opened, returning the feeding silo to an atmospheric pressure operating state. Repeating the above process enables the automatic feeding of materials from the feed hopper under normal pressure and the continuous feeding of materials from the working hopper to the reactor under pressure.

[0006] Furthermore, the method controls the material feeding rate through a feeding disc at the bottom of the working hopper, and drives the feeding rod to rotate via a drive shaft, pushing the material in the storage tank into the discharge port in the direction of rotation, and adding it evenly into the reactor. This method uses volumetric metering, and the parameters involved are mainly related to the rotational speed of the drive shaft, the outer diameter of the storage tank, the diameter of the discharge port, and the height of the feeding rod. The specific calculation method for the feeding rate per unit time is as follows: The formula for calculating the annular area S of the storage tank after one revolution of the feeding disc is: In the above formula, S represents the area of ​​material that can be stored in one revolution of the feeding disc, in mm. 2 ; R is the radius of the feed disc, in mm; D is the diameter of the bottom discharge port, in mm; m is the number of feeding rods; A represents the area of ​​the intersection between the feed lever and the annular area, in mm. 2 ; The formula for calculating the area A of the region where the feeding rod intersects with the annular area is: In the above formula, b represents the width of the feed bar, in mm; r=RD, unit is mm; Let the height of the feeding rod be H, and the formula for calculating the volume Q of the material on the feeding disc ring is: In the above formula, Q represents the volume of material stored in the storage tank around one revolution, in mm. 3 ; H represents the height of the feed lever, in mm; The formula for calculating the material V added to the reactor per unit time, i.e., the feeding rate, is: In the above formula, V represents the feeding rate, measured in mL / min; n represents the rotational speed of the feed disc, measured in rpm.

[0007] Based on the process requirements for feeding speed, the feeding speed can be changed by altering the radius R of the feeding disc, the diameter D of the bottom outlet, and the height H of the feeding rod during the design phase. During equipment operation, the feeding speed can also be changed by altering the rotational speed n of the feeding disc, thus achieving continuous and real-time control over the amount of solid material fed.

[0008] Furthermore, a dual-compartment structure device consisting of a hopper (working hopper, feeding hopper) and an equipment hopper (see...) Figure 1 (6 and 23 in the text) solves the sealing problem for mechanical shafts with gaseous media sealing pressure below 0.5MPa. The typical reaction pressure is around 1MPa, and this device can achieve a sealing pressure of 3MPa for gaseous media. This invention installs the drive device and coupling inside the equipment chamber, and performs special sealing on the power transmission cables, air pipes, and hydraulic pipes, which meets the process requirements. During operation, the equipment chamber is filled with the same gas pressure as the material silo, ensuring that the material silo operates stably under pressure without leakage.

[0009] The advantages of the pressurized automatic continuous solid feeding process and method of this application are: It can achieve continuous and stable feeding of solid materials under pressure, avoiding cumbersome steps such as stopping, depressurizing, and pressurizing in the middle, thus improving the operating efficiency of the equipment.

[0010] The entire process, logic, equipment start-up and shutdown can be fully automated through the PLC control system, reducing manpower input and improving production efficiency.

[0011] The material is fed by volumetric metering, which can also be converted to mass feeding. The feeding speed can be precisely controlled by PLC and the bottom structure of the working hopper to meet the process raw material requirements and improve reaction efficiency. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of the pressurized automatic continuous solid feeding device described in this application; Figure 2 This is a schematic diagram of the feeding disc structure; In the above attached diagram, 1-Solid material inlet, 2-Raw material gas inlet, 3-Pressure holding feeding valve, 4-Pressure valve, 5-Feeding hopper pressure gauge, 6-Feeding hopper, 7-Pressure relief gas outlet, 8-Equipment hopper pressure relief valve, 9-Equipment hopper one, 10-Power transmission pipeline sealing device, 11-Pressure relief gas outlet, 12-Feeding hopper pressure relief valve, 13-Material conveying drive device, 14-Feeding hopper level gauge, 15-Feeding hopper arch breaking device, 16-Material... 17-Working silo pressure gauge, 18-Working silo pressure relief valve, 19-Working silo pressure boosting valve, 20-Working silo level gauge, 21-Equipment silo II pressure boosting valve, 22-Power transmission pipeline sealing device, 23-Working silo, 24-Working silo arch breaking device, 25-Equipment silo II pressure relief valve, 26-Equipment silo II, 27-Working silo drive device, 28-Coupling, 29-Feeding valve, 30-Reactor, 31-Pulling disc; 51-Storage trough, 52-Pushing rod, 53-Discharge port, 54-Drive shaft. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] This application proposes a pressurized automatic continuous solid feeding process and method, based on, as follows: Figure 1 The pressurized automatic continuous solid feeding device shown requires that, in order to meet the working conditions of continuous operation of the reactor under pressure, solid raw materials should be continuously added according to process requirements. The pressure of the working hopper 23 must be greater than or equal to the pressure of the reactor 30 for the material to be added to the reactor 30 by gravity, thus achieving the requirement of continuous reaction.

[0015] The two-stage silo structure of this invention, namely the feeding silo 6 and the working silo 23, achieves the functions of feeding material into the feeding silo 6 under normal pressure and continuously and automatically feeding material from the working silo 23 to the reactor 30 under pressure through a series operation. Its characteristic is that the working silo 23 always operates under the same pressure as the reactor 30, and solid materials can be continuously and stably fed into the reactor 30 under pressure and its own gravity. The feeding silo 6 operates intermittently and alternately under pressure and normal pressure conditions. Under normal pressure conditions, the silo connecting valve 16 is closed, and the feeding silo... When the pressure relief valve 12 is opened, and the pressure-holding feeding valve 3 is opened when the pressure gauge 5 of the feeding hopper indicates "0", material can be fed into the feeding hopper 6. Feeding is completed when the required quantity or the material level gauge 14 of the feeding hopper is reached. The pressure-holding feeding valve 3 and the pressure relief valve 12 of the feeding hopper are then closed, sealing the feeding hopper 6. Then, the pressure-increasing valve 4 is opened to pressurize the feeding hopper 6. When the pressure is consistent with the raw material gas pressure, the feeding hopper 6 is in pressurized operation. At this time, the hopper connecting valve 16 is opened, and the feeding hopper conveying drive device 13 is started to convey material into the working hopper 23. After the material conveying is completed, the hopper connecting valve 16 is closed, and the pressure relief valve 12 of the feeding hopper is opened to release pressure, so that the feeding hopper 6 is in normal pressure operation. Repeating the above process realizes the function of feeding material into the feeding hopper 6 at normal pressure and continuously and automatically feeding material from the working hopper 23 to the reactor 30 under pressure. By using the two-stage series connection of the feeding bin 6 and the working bin 23, continuous and stable feeding of solid materials under pressure can be achieved, avoiding cumbersome steps such as stopping the machine midway and depressurizing.

[0016] This method controls the material feeding rate through the feeding disc 31 at the bottom of the working hopper 23. The drive shaft 54 ​​rotates the feeding rod 52, pushing the material in the storage tank 51 into the discharge port 53 in the direction of rotation, and uniformly adding it into the reactor 30. This method uses volumetric metering, and the parameters involved mainly include the rotational speed of the drive shaft 54, the outer diameter of the storage tank 51, the diameter of the discharge port 53, and the height of the feeding rod 52. The specific calculation method for the feeding rate per unit time is as follows: The formula for calculating the annular area S of the storage tank 51 after one revolution of the feeding disc 31 is as follows: In the above formula, S represents the area of ​​material that can be stored in one revolution of the feeding disc, in mm. 2 ; R is the radius of the feed disc, in mm; D is the diameter of the bottom discharge port, in mm; m is the number of feeding rods; A represents the area of ​​the intersection between the feed lever and the annular area, in mm. 2 ; The formula for calculating the area A of the region where the material feeding rod 52 intersects with the annular area is: In the above formula, b represents the width of the feed bar, in mm; r=RD, unit is mm; Let the height of the feeding rod 52 be H, and the method for calculating the volume Q of the material on the feeding ring of the feeding disc 31 is as follows: In the above formula, Q represents the volume of material stored in the storage tank around one revolution, in mm. 3 ; H represents the height of the feed lever, in mm; The method for calculating the material V added to reactor 30 per unit time, i.e., the feeding rate, is as follows: In the above formula, V represents the feeding rate, measured in mL / min; n represents the rotational speed of the feed disc, measured in rpm.

[0017] If the feeding rate is measured by mass, the formula for calculating the mass flow rate is: In the above formula, G represents the mass feeding rate, measured in g / min. ρ is the bulk density of the material, expressed in g / mL.

[0018] Based on the process requirements for feeding speed, the feeding speed can be changed by altering the radius R of the feeding disc 31, the diameter D of the bottom outlet 53, and the height H of the feeding rod 52 during the design phase. During equipment operation, the feeding speed can also be changed by altering the rotational speed n of the feeding disc 31, thus achieving continuous and real-time control over the amount of solid material fed.

[0019] This method solves the sealing problem for mechanical shafts with gaseous media at sealing pressures below 0.5 MPa by using a dual-compartment structure consisting of a working hopper 23 and equipment compartment 9, and a feeding hopper 6 and equipment compartment 26. The typical reaction pressure is around 1 MPa, and this device can achieve a sealing pressure of 3 MPa for gaseous media. This invention integrates the material conveying drive device 13, the working hopper drive device 27, and the coupling 28 into equipment compartment 9 and equipment compartment 26 respectively, and provides specialized sealing for the power transmission cables, air pipes, and hydraulic pipes, meeting the process requirements. During operation, the equipment compartments are filled with the same gas pressure as the material hoppers, ensuring stable operation of the material hoppers under pressurized conditions without leakage.

[0020] The equipment silo and the working material silo are designed according to pressure vessel standards. Locking seals are used to seal the power transmission pipeline sealing devices 10 and 22, ensuring no leakage of gaseous raw materials. The equipment silo is pressurized during operation and depressurized during maintenance.

[0021] This invention is achieved through, as follows Figure 1 As will be apparent to those skilled in the art, various changes or equivalent substitutions can be made to these features and embodiments without departing from the technical and structural scope of the invention. Furthermore, under the teachings of this invention, modifications can be made to these features and embodiments to adapt to specific circumstances and materials without departing from the technical and structural scope of the invention. Therefore, the invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are protected by this invention.

Claims

1. A pressurized automatic continuous solid feeding process and method, characterized in that... Through a two-stage silo structure, namely the feeding silo 6 and the working silo 23 (see Figure 1) connected in series, the functions of feeding material into the feeding silo 6 under normal pressure and continuously and automatically feeding material from the working silo 23 into the reactor 30 under pressure are realized. The working silo 23 always operates under the same pressure as the reactor 30 and can continuously and stably feed material into the reactor 30 under pressure. The feeding silo 6 operates intermittently under pressure and normal pressure conditions. Under normal pressure conditions, the silo connecting valve 16 is closed and the pressure-holding feeding valve 3 is open, at which time material can be fed into the feeding silo 6. When the feeding is completed, the pressure-holding feeding valve 3 is closed. After the material is added, the pressure valve 4 is opened to pressurize the feeding silo 6. When the pressure is consistent with the raw material gas pressure, the feeding silo 6 is under pressure. At this time, the silo connecting valve 16 is opened, and the feeding silo 6 can transport material into the working silo 23. After the material conveying is completed, close the silo connecting valve 16 and open the feeding silo pressure relief valve 12 to bring the feeding silo 6 into a normal pressure working state. Repeating the above process realizes the function of feeding material into the feeding silo 6 under normal pressure and continuously and automatically feeding material from the working silo 23 into the reactor 30 under pressure.

2. The pressurized automatic continuous solid feeding process and method according to claim 1, characterized in that, The method described above controls the material conveying and feeding amount through the feeding disc 31 (see Figure 2) at the bottom of the working hopper 23. The drive shaft 54 ​​rotates the feeding rod 52, pushing the material in the storage tank 51 into the discharge port 53 in the direction of rotation, and uniformly adding it into the reactor 30. This method uses volumetric metering, and the parameters involved mainly include the rotational speed of the drive shaft 54, the outer diameter of the storage tank 51, the diameter of the discharge port 53, and the height of the feeding rod 52. The specific calculation method for the feeding amount per unit time is as follows: ； Let the height of the feeding rod 52 be H, and the method for calculating the volume Q of the material on the feeding ring of the feeding disc 31 is as follows: In the above formula, Q represents the volume of material stored in the storage tank around one revolution, in mm. 3 ; H represents the height of the feed lever, in mm; The material V added to reactor 30 per unit time, i.e., the feeding rate, is: ； In the above formula, V represents the feeding rate, measured in mL / min; n is the rotational speed of the feeding disc, in rpm; Based on the process requirements for feeding speed, the feeding speed can be changed by altering the radius R of the feeding disc 31, the diameter D of the bottom outlet 53, and the height H of the feeding rod 52 during the design phase. During equipment operation, the feeding speed can also be changed by altering the rotational speed n of the feeding disc 31, thus achieving continuous and real-time control over the amount of solid material fed.

3. The pressurized automatic continuous solid feeding process and method according to claim 1, characterized in that, The dual-compartment structure of the hopper (working hopper 23, feeding hopper 6) and equipment hopper (see 6 and 23 in Figure 1) solves the sealing problem for mechanical shafts with gaseous media sealing pressure below 0.5 MPa. The typical reaction pressure is around 1 MPa, and this device can achieve a gaseous media sealing pressure of 3 MPa. This invention integrates the drive device and coupling into the equipment hopper and performs special sealing on the power transmission cables, air pipes, and hydraulic pipes, meeting the process requirements. During operation, the equipment hopper is filled with the same gas pressure as the hopper, ensuring stable operation of the hopper under pressurized conditions without leakage.

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