Dry-process acetylene calcium carbide residue screw conveying and discharging device
By designing a dry acetylene carbide slag screw conveyor and slag discharge device, and using a signal acquisition and control system to dynamically adjust the baffle plate, the problem of acetylene gas entrainment in carbide slag was solved, achieving effective material sealing, reducing resource waste and environmental pollution, and improving production efficiency.
Patent Information
- Application Number
- CN202422703348.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-04
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2034-11-04
AI Technical Summary
In the dry acetylene production process, the acetylene gas entrained in the calcium carbide slag leads to resource waste and environmental pollution. Existing slag discharge devices cannot simultaneously achieve continuous operation and effective material sealing.
A dry acetylene carbide slag screw conveyor discharge device was designed. Through signal acquisition and control system, the opening and closing of the baffle plate is dynamically adjusted to form a material sealing section, which ensures effective sealing of acetylene gas during the slag discharge process and reduces loss.
It reduces acetylene gas consumption, lowers enterprise production costs, improves resource utilization, reduces environmental pollution, simplifies mechanical structures, and reduces maintenance frequency.
Smart Images
Figure CN223606375U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the calcium carbide slag discharging device especially relates to dry process acetylene calcium carbide slag screw conveyor discharging slag device belongs to the acetylene process equipment technical field. BACKGROUND
[0002] Polyvinyl chloride resin (PVC) is one of the world's five general resins, and it has been widely used in social life because of its outstanding cost performance. The calcium carbide acetylene route for producing PVC from calcium carbide (CaC2) and acetylene gas (C2H2) is the main technical scheme for PVC production in China at present due to abundant coal resources and simple and mature process. The PVC production by the calcium carbide route in China in 2023 exceeded 20 million tons, accounting for more than 70% of the total production. Acetylene is a raw material for PVC production and also a product generated after calcium carbide hydrolysis, which has high social and economic value. Calcium carbide slag is the waste residue of calcium carbide hydrolysis, and its main component is calcium hydroxide, which has low economic value and is currently mainly used as a calcium raw material in cement plants. Therefore, the production cost of PVC is 80% of the raw material cost of calcium carbide, and various losses of acetylene should be minimized during the production process.
[0003] Dry process acetylene production technology has obvious water-saving advantages and is the development trend of acetylene industry in western regions. 1t of calcium carbide plus water can generate about 300 kg of acetylene gas and 1.2t of dry calcium carbide slag. The process is that small particle calcium carbide of 3-5 mm after screening enters the generator through the screw feeder. The water mist generated by the nozzle at the top of the generator reacts with calcium carbide to produce acetylene gas and calcium carbide slag. The acetylene gas carries a large amount of heat, dust and impurity gas, which is cooled by the evaporative cooling cooler, then the dust is removed and cooled again by the washing cooling tower, then the impurities are removed by the cleaning tower, the acidic gas is removed by the neutralization tower, and finally it is sent to the VCM synthesis process; the generated calcium carbide slag is discharged from the lower part of the generator and enters the dry slag bin through the FU conveyor and bucket elevator.
[0004] In recent years, although the dry process acetylene technology has been popularized, part of the acetylene is wasted because the "dry slag" discharged has adsorbed acetylene and is entrained and discharged in the interstitial space of the calcium carbide slag particles. Research literature shows that the adsorption of calcium carbide slag makes the acetylene gas loss in the new dry process acetylene process more than that in the wet process, because the temperature of the slag slurry liquid discharged in the wet process is relatively high at about 80℃, and the dissolution of acetylene gas decreases with the increase of temperature. The amount of acetylene adsorbed in the dry process acetylene calcium carbide slag is about 80% of the total loss. In order to reduce production costs, enterprises usually adopt the direct discharge method, which not only causes great waste of acetylene resources, but also directly discharges acetylene gas, which will increase VOCs in the atmosphere and cause environmental pollution and damage.
[0005] At present, there are two kinds of slag discharge modes for the dry-process acetylene generator: 1. Star-shaped feeder, the device is evenly distributed with six rectangular blades on a rotating shaft, which is driven to run by a motor and a speed reducer, the device can realize continuous and stable operation, but cannot realize material sealing by itself, and cannot solve the problem of calcium carbide slag entraining acetylene gas. 2. Spiral slag discharger, the device is evenly welded with equidistant rotating blades on a rotating shaft, which is driven to run by a motor and a speed reducer, the device can solve the problem of calcium carbide slag entraining acetylene gas under the action of the rotating blades, but cannot realize continuous operation. SUMMARY
[0006] In order to solve the above technical problems, the utility model provides a dry-process acetylene calcium carbide slag spiral conveying and discharging device, which can form an effective material sealing section during generator slag discharge, reduce acetylene gas loss, reduce enterprise production cost, improve resource utilization rate and reduce environmental pollution.
[0007] In order to achieve the above purpose, the utility model provides the following technical scheme:
[0008] The dry-process acetylene calcium carbide slag spiral conveying and discharging device comprises a shell, a first power mechanism and a second power mechanism, the shell is provided with a calcium carbide slag inlet and a calcium carbide slag outlet, a spiral conveying mechanism is arranged in the shell, one end of the spiral conveying mechanism is connected with the first power mechanism, the other end is a free end, a baffle plate is arranged on the second power mechanism, the baffle plate can block the calcium carbide slag outlet under the action of the second power mechanism, a signal acquisition mechanism is arranged on the first power mechanism, a signal execution mechanism is arranged on the second power mechanism, a control station and a signal transmission system are further arranged, the signal transmission system transmits the signal value of the signal acquisition mechanism to the control station, the control station analyzes and processes the signal value to control the movement of the signal execution mechanism, thereby driving the second power mechanism and the baffle plate to move, and a material sealing section is formed in the shell between the free end of the spiral conveying mechanism and the baffle plate.
[0009] Further, the signal execution mechanism at least comprises a walking mechanism, and the walking mechanism is fixed below the second power mechanism.
[0010] Further, a track platform and a cylinder are further arranged, the walking mechanism is arranged on the track platform, and the cylinder is fixedly connected with the track platform.
[0011] Further, a connecting rod is arranged between the cylinder and the walking mechanism, the connecting rod is connected with a piston rod of the cylinder through a universal joint, and the walking mechanism is controlled to move forward or backward on the track platform through the piston rod of the cylinder.
[0012] As a preferred, the shell is in an inverted T-shaped structure, the spiral conveying mechanism is horizontally arranged in a cavity of the shell, the calcium carbide slag inlet is arranged above the spiral conveying mechanism, and the calcium carbide slag inlet is connected with a discharge port of the generator.
[0013] Preferably, the material blocking plate is connected with the second power mechanism through a transmission shaft, the transmission shaft is provided with a shaft sleeve, and a calibration spring is arranged between the material blocking plate and the shaft sleeve.
[0014] Further, the material blocking plate is a plate-shaped body arranged vertically and has a size larger than that of the calcium carbide slag outlet on the shell.
[0015] Preferably, a gas guide rod is further arranged, the gas guide rod passes through the material blocking plate and is located above the screw conveying mechanism.
[0016] Preferably, the screw conveying mechanism comprises two screw conveyors with opposite rotation directions and mutually embedded screw blades.
[0017] Compared with the prior art, the device of the utility model not only simplifies the mechanical structure, reduces the lubricating device and reduces the maintenance frequency of the device by personnel, but also accurately controls the opening degree of the material blocking plate through the current range of the screw conveying mechanism when discharging the calcium carbide slag, reduces the seal breaking rate of the slag discharging device, thereby ensuring that an effective material sealing section can be formed in the shell when the generator discharges the slag, preventing the acetylene gas from being discharged with the calcium carbide slag to the subsequent ash conveying system, reducing the loss of acetylene gas, reducing the production cost of enterprises, improving the resource utilization rate, and reducing environmental pollution. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 is a structural schematic view of the utility model.
[0019] As shown in the figure: 1 is an auger motor, 2 is a discharging motor, 3 is a shell, 4 is a screw conveying mechanism, 5 is a calcium carbide slag inlet, 6 is a calcium carbide slag outlet, 7 is a gas guide rod, 8 is a material blocking plate, 9 is a walking mechanism, 10 is a track platform, 11 is a gas cylinder, 12 is a signal acquisition mechanism, 13 is a signal transmission system, 14 is a control station, 15 is a calibration spring, 16 is a transmission shaft, 17 is a material sealing section, and 18 is a connecting rod. DETAILED DESCRIPTION
[0020] The preferred embodiment of the utility model will be described in detail below.
[0021] Example 1: Refer to Figure 1 , is a structural schematic view of the utility model example 1,
[0022] The dry-process acetylene calcium carbide slag screw conveying and discharging device comprises a shell 3, a first power mechanism and a second power mechanism,
[0023] The shell 3 is inverted T structure, the shell 3 is provided with calcium carbide slag inlet 5 and calcium carbide slag outlet 6, the shell 3 is provided with spiral conveying mechanism 4, the spiral conveying mechanism 4 includes two rotating directions opposite and spiral blade mutually embedded spiral conveyer, one end of the spiral conveying mechanism 4 is connected with first power mechanism, the other end is free end, the spiral conveying mechanism 4 is horizontally arranged in the cavity of shell 3, the calcium carbide slag inlet 5 is arranged above the spiral conveying mechanism 4, the calcium carbide slag inlet 5 is connected with the discharge port of generator.
[0024] The first power mechanism includes auger motor 1, speed reducer and shaft coupling, the transmission shaft of motor is connected with speed reducer through shaft coupling and key, the speed reducer is connected with the two spiral conveyers arranged in the shell 3 through shaft coupling and key, when the motor rotates, the shaft of motor transmits the rotating force to the speed reducer through key, and the speed reducer drives the spiral conveyer to rotate by key in the same way;
[0025] The second power mechanism includes discharge motor 2, speed reducer and shaft coupling, the second power mechanism is provided with baffle plate 8, the baffle plate 8 is vertically arranged plate-shaped body and its size is greater than the size of calcium carbide slag outlet 6 on the shell 3, the second power mechanism is connected with baffle plate 8 through telescopic transmission shaft 16, the baffle plate 8 can block calcium carbide slag outlet 6 under the action of the second power mechanism, the transmission shaft 16 is provided with shaft sleeve, the baffle plate 8 and the shaft sleeve are provided with calibration spring 15, the calibration spring can ensure the stable operation of the baffle plate 8 and play a certain buffering effect.
[0026] The auger motor 1 is provided with signal acquisition mechanism 12, the discharge motor 2 is provided with signal execution mechanism, the signal execution mechanism includes walking mechanism 9 and cylinder 11, the walking mechanism 9 is fixed below the discharge motor 2, the walking mechanism 9 is arranged on the track platform 10, the track platform 10 is installed on the foundation through four profile steel legs, the inclined bars are welded between the legs, and the track is formed by welding two channel steels on the legs, the horizontal bars are welded between the tracks, the rollers arranged below the walking mechanism 9 move in the channel steel parallel to the track, the cylinder 11 is fixedly connected with the track platform 10, the connecting rod 18 is arranged between the cylinder 11 and the walking mechanism 9, the connecting rod 18 is connected with the piston rod of the cylinder 11 through universal joint, and the walking mechanism 9 is controlled to advance or retreat on the track platform 10 through the piston rod of the cylinder 11.
[0027] The control station 14 and signal transmission system 13 are further provided, the signal transmission system 13 transmits the signal value of signal acquisition mechanism 12 to control station 14, the control station 14 controls the movement of signal execution mechanism after analysis and processing, thereby driving the second power mechanism and baffle plate 8 to move, and forming material sealing section 7 between the free end of spiral conveying mechanism 4 and baffle plate 8 in the shell 3.
[0028] Working principle: the current of the auger motor 1 changes with the change of the amount of transported carbide slag, the signal acquisition mechanism 12 installed on the power supply system of the auger motor 1 is responsible for acquiring the operating current of the motor, the acquired current value is converted into a weak current signal by the signal acquisition mechanism 12, and the signal is sent to the control station 14 through the signal transmission system 13, the control station 14 analyzes the changing current, processes the analysis result, controls the electromagnetic air cylinder 11 to act, and the actuator controls the walking mechanism 9 to drive the discharging motor 2 to move forward or backward according to the control signal, so as to realize the opening and closing of the blocking plate 8, and the calibration spring ensures the flatness of the blocking plate 8.
[0029] When working, the operating current of the spiral conveying mechanism 4, i.e. the current of the auger motor 1, is divided into three sections, one section is the effective operation range, the current is controlled in 33A-40A; one section is the prompt range, the current is controlled in 28A-32A; one section is the abnormal working condition range, the current is controlled in 40A-45A. When in the effective operation range (current 33A-40A), the spiral slag discharging device normally discharges slag, forms an effective material seal, and can prevent the waste of acetylene gas caused by discharging the acetylene gas to the subsequent ash conveying system with the carbide slag.
[0030] When the current of the discharging motor 2 is lower than the effective operation range, the piston rod of the air cylinder 11 is in a closed state, the blocking plate 8 is closed with the carbide slag discharging port on the spiral slag discharging device shell 3 under the action of the calibration spring 15, and the carbide slag forms a material seal section 7 under the blockage of the blocking plate 8. In this process, the material seal section 7 interacts with the rotating blade, and the material seal section 7 is compacted by the thrust of the rotating blade. In the process of compacting the carbide slag, the rotating blade transmits the reaction force of the carbide slag to the auger motor 1 connected with the spiral slag discharging mechanism through the auger shaft, so that the current of the auger motor 1 rises due to the influence of the material seal section 7. When the current enters the effective operation range (current 33A-40A), the carbide slag pushes away the blocking plate 8 to discharge, the piston rod of the air cylinder 11 starts to open, the discharging motor 2 is driven by the walking mechanism 9 to move in the opening direction of the blocking plate 8, the distance between the carbide slag discharging port and the opening of the blocking plate 8 increases, the discharging amount increases, the load of the auger motor 1 decreases, and the current decreases. When the current enters the prompt section range (current 28A-32A), the air cylinder 11 moves to the closed state, and the blocking plate 8 is closed with the carbide slag discharging port on the spiral slag discharging device shell 3 under the action of the discharging motor 2 and the calibration spring 15. The reciprocating motion is performed to realize the discharging of the carbide slag. When the technical scheme is adopted, the breaking rate of the material seal section 7 can be reduced by 50%, the acetylene gas content in the discharged carbide slag is effectively reduced, and the consumption of carbide and production cost can be further reduced. If the current enters the abnormal working condition range, manual intervention is allowed to manually operate to discharge the slag.
[0031] Example 2: Compared with example 1, the difference of the example is that a gas guide rod 7 is further provided, the gas guide rod 7 passes through the material blocking plate 8 and is located above the spiral conveying mechanism 4, the gas guide rod 7 comprises a shaft and blades fixed outside the shaft, when the gas guide rod 7 rotates, the blades fixed on the shaft can loosen the carbide slag, which is beneficial to the return of the ethyne gas carried by the carbide slag to the generator through the backflow channel formed by the gas guide rod 7.
[0032] The preferred embodiments of the present application are described above, it should be noted that for those skilled in the art, without departing from the inventive concept of the present application, a number of changes and improvements can be made, which all belong to the protection scope of the present application.
Claims
1. A dry-process acetylene calcium carbide slag screw conveying and discharging device, comprising a shell, a first power mechanism and a second power mechanism, a calcium carbide slag inlet and a calcium carbide slag outlet are arranged on the shell, a screw conveying mechanism is arranged in the shell, one end of the screw conveying mechanism is connected with the first power mechanism, and the other end is a free end, characterized in that: The second power mechanism is provided with a material blocking plate, which can block the carbide slag outlet under the action of the second power mechanism, the first power mechanism is provided with a signal acquisition mechanism, the second power mechanism is provided with a signal execution mechanism, and a control station and a signal transmission system are further provided, the signal transmission system transmits the signal value of the signal acquisition mechanism to the control station, the control station analyzes and processes the signal to control the movement of the signal execution mechanism, thereby driving the movement of the second power mechanism and the material blocking plate, and forming a material sealing section between the free end of the spiral conveying mechanism and the material blocking plate. 2. The dry acetylene carbide slag screw conveying and discharging device according to claim 1, characterized in that: The signal execution mechanism at least includes a walking mechanism, and the walking mechanism is fixed below the second power mechanism.
3. The dry acetylene carbide slag screw conveying and discharging device according to claim 2, characterized in that: A track platform and a cylinder are further provided, the walking mechanism is arranged on the track platform, and the cylinder is fixedly connected with the track platform.
4. The dry acetylene carbide slag screw conveying and discharging device of claim 3, characterized in that: A connecting rod is arranged between the cylinder and the walking mechanism, the connecting rod is connected with a piston rod of the cylinder, and the walking mechanism is controlled to advance or retreat on the track platform through the piston rod of the cylinder.
5. The dry acetylene carbide slag screw conveying and discharging device according to any one of claims 1-4, characterized in that: The shell is in a reverse T-shaped structure, the spiral conveying mechanism is horizontally arranged in the cavity of the shell, and the carbide slag inlet is arranged above the spiral conveying mechanism.
6. The dry acetylene carbide slag screw conveying and discharging device according to any one of claims 1-4, characterized in that: The material blocking plate and the second power mechanism are connected through a transmission shaft, the transmission shaft is provided with a shaft sleeve, and a calibration spring is arranged between the material blocking plate and the shaft sleeve.
7. The dry acetylene carbide slag screw conveying and discharging device according to claim 5, characterized in that: The material blocking plate and the second power mechanism are connected through a transmission shaft, the transmission shaft is provided with a shaft sleeve, and a calibration spring is arranged between the material blocking plate and the shaft sleeve.
8. The dry acetylene carbide slag screw conveying and discharging device according to any one of claims 1-4, characterized in that: The material blocking plate is a vertically arranged plate-shaped body, and the size of the material blocking plate is greater than that of the carbide slag outlet on the shell.
9. The dry acetylene carbide slag screw conveying and discharging device according to any one of claims 1-4, characterized in that: A gas guide rod is further provided, the gas guide rod passes through the material blocking plate and is located above the spiral conveying mechanism.
10. The dry acetylene carbide slag screw conveying and discharging device according to any one of claims 1-4, characterized in that: The spiral conveying mechanism includes two spiral conveyors with opposite rotation directions and mutually embedded spiral blades.