Dry-process acetylene carbide slag pneumatic conveying system

Abstract

The utility model discloses a kind of dry-process acetylene carbide slag pneumatic conveying systems, including carbide slag storage bin, sludge conveyor, carbide slag buffer tank, pneumatic conveying pipeline and reaction kettle, the lower outlet of the carbide slag storage bin is connected with electric plug-in valve one, electric plug-in valve lower portion is connected with feeder, the lower portion of the feeder is connected with sludge conveyor, the end of the sludge conveyor is connected with sludge drop pipe, the sludge drop pipe outlet is connected with electric plug-in valve two, the lower portion of the electric plug-in valve two is connected with carbide slag buffer tank, the lower outlet of the carbide slag buffer tank is connected with control valve, the lower portion of the control valve is connected with the pneumatic conveying pipeline, the lower portion of the control valve is also connected with nitrogen pipeline, and reaction kettle is connected at the end of pneumatic conveying pipeline.The utility model can stably, efficiently convey original carbide slag to subsequent deep processing reaction kettle, reduce enterprise production cost, improve on-site cleanliness.

Description

Technical Field

[0001] This utility model relates to the field of dry acetylene production technology, and in particular to a pneumatic conveying system for dry acetylene calcium carbide slag. Background Technology

[0002] Dry acetylene production is a process that generates acetylene through the reaction of calcium carbide and water. Its key feature is that water is sprayed into the calcium carbide in a mist form, and the heat of reaction is dissipated through the latent heat of water evaporation. The following is the main flow chart of the dry acetylene production process:

[0003] Calcium carbide pretreatment:

[0004] The calcium carbide is crushed and screened to achieve a particle size of approximately 3mm. The crushed calcium carbide is then conveyed to a buffer silo via a bucket elevator.

[0005] Acetylene generation:

[0006] Calcium carbide enters the acetylene generator, and water is sprayed into the generator in mist form to react with the calcium carbide. The reaction temperature is controlled at 95–105℃, and the pressure is controlled at 4–6 kPa. The crude acetylene gas produced by the reaction, along with water vapor, enters the condenser for cooling.

[0007] Acetylene gas treatment:

[0008] The cooled acetylene gas enters the gas holder or cooling tower through a positive water seal and a reverse water seal. The condensed water is filtered and recycled.

[0009] The main component of calcium carbide slag produced by the dry acetylene process is calcium hydroxide (Ca(OH)2), which has a high CaO content. The treatment methods for calcium carbide slag are as follows:

[0010] Cement production:

[0011] Calcium carbide slag can be used as a calcium-based raw material in cement production, replacing limestone. Due to its high CaO content and low decomposition temperature, calcium carbide slag can save on fuel consumption.

[0012] Environmentally friendly utilization:

[0013] Calcium carbide slag has a fine particle size and can be used directly in cement production without further grinding. In addition, calcium carbide slag can also be used in the production of building bricks.

[0014] The carbide slag produced by the dry acetylene process is in the form of dry powder, which is easy to handle and utilize, and reduces the environmental pollution caused by carbide slag slurry in the wet process.

[0015] The dry process reduces water waste and lowers production costs. Meanwhile, carbide slag can be directly used in cement production, reducing waste disposal costs.

[0016] The dry acetylene process has stricter reaction conditions, with a large amount of water vapor and a high temperature inside the reactor, resulting in higher safety.

[0017] The dry acetylene process has a high degree of automation and strong airtightness, which increases the safety and stability of operation.

[0018] The dry acetylene production process generates a large amount of calcium carbide slag. Traditional calcium carbide slag conveying methods suffer from low efficiency, making it difficult to meet the material supply demands of subsequent deep processing. Furthermore, the conveying process is prone to spillage and dust generation, leading to material waste, increased production costs, and a dirty, messy, and unclean production environment, negatively impacting the working environment and health of operators, and failing to meet environmental protection requirements. Therefore, there is an urgent need for a highly efficient and clean calcium carbide slag conveying system to effectively collect and transport the slag, meeting the needs of subsequent deep processing. Utility Model Content

[0019] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a dry acetylene carbide slag pneumatic conveying system. This invention can stably and efficiently convey the original carbide slag to the subsequent deep processing reactor, reducing enterprise production costs and improving on-site cleanliness.

[0020] This utility model is achieved through the following technical solution:

[0021] A dry acetylene-based pneumatic conveying system for calcium carbide slag includes a calcium carbide slag storage silo, a slag conveyor, a calcium carbide slag buffer tank, a pneumatic conveying pipeline, and a reactor. The lower outlet of the calcium carbide slag storage silo is connected to an electric slide valve one. A feeder is connected below the electric slide valve, and the slag conveyor is connected below the feeder. A slag discharge pipe is connected to the end of the slag conveyor, and the outlet of the slag discharge pipe is connected to an electric slide valve two. The lower part of the electric slide valve two is connected to the calcium carbide slag buffer tank, and the lower outlet of the calcium carbide slag buffer tank is connected to a control valve. The pneumatic conveying pipeline is connected below the control valve, and a nitrogen pipeline is also connected below the control valve. The end of the pneumatic conveying pipeline is connected to the reactor.

[0022] The feeder is a star-shaped feeder.

[0023] The nitrogen pipeline is also connected to the top inlet of the carbide slag buffer tank.

[0024] The nitrogen pipeline delivers 0.6 MPa nitrogen to the carbide slag buffer tank and the pneumatic conveying pipeline.

[0025] The control valve is a pneumatic control valve.

[0026] The slag conveyor mentioned is a screw conveyor.

[0027] Working principle:

[0028] Carbide slag storage silo:

[0029] After being produced by the dry acetylene generator, the calcium carbide slag enters the calcium carbide slag storage silo. The calcium carbide slag storage silo serves as a temporary storage and buffer to ensure a stable supply of calcium carbide slag.

[0030] The lower outlet of the carbide slag storage silo is connected to an electric slide valve, which controls the discharge of carbide slag.

[0031] Feeder and screw conveyor:

[0032] A feeder is connected to the lower part of the electric slide gate valve, which evenly feeds the carbide slag into the screw conveyor.

[0033] The screw conveyor transports calcium carbide slag from the storage silo to the slag discharge pipe through the rotation of the screw blades. The slag discharge pipe is connected to the end of the screw conveyor.

[0034] Carbide slag buffer tank:

[0035] The outlet of the slag discharge pipe is connected to an electrically controlled slide valve II, which controls the flow of calcium carbide slag into the calcium carbide slag buffer tank.

[0036] The top of the carbide slag buffer tank is connected to a nitrogen pipeline. Nitrogen is used to protect the carbide slag and prevent it from reacting with air or spontaneously combusting.

[0037] The lower outlet of the carbide slag buffer tank is connected to a pneumatic control valve, which controls the carbide slag to enter the pneumatic conveying pipeline.

[0038] Pneumatic conveying pipeline:

[0039] A pneumatic conveying pipeline is connected below the pneumatic control valve, and a nitrogen pipeline is also connected below the pneumatic control valve. Nitrogen is used as the conveying medium to transport the carbide slag to the reactor through the pneumatic conveying pipeline.

[0040] The pneumatic conveying pipeline uses the kinetic energy of nitrogen to transport carbide slag to the reactor in a suspended or thrombated form.

[0041] Reactor:

[0042] The end of the pneumatic conveying pipeline is connected to the reactor. Calcium carbide slag enters the reactor through the pneumatic conveying system for subsequent processing or reaction.

[0043] The advantages of this utility model are: an electric slide valve is installed at the bottom of the carbide slag storage bin, and a star feeder is connected to the bottom of the electric slide valve. The flow rate of carbide slag from the carbide slag storage bin into the screw conveyor can be accurately controlled through the star feeder to achieve stable feeding.

[0044] This utility model installs a screw conveyor below a star-shaped feeder. The end of the screw conveyor is connected to a slag discharge pipe. The star-shaped feeder evenly conveys the carbide slag to the screw conveyor. The screw conveyor, through the rotation of the screw blades, conveys the carbide slag along the pipe to the slag discharge pipe for further transmission.

[0045] The present invention has an electric slide valve II installed at the lower part of the slag discharge pipe, and a carbide slag buffer tank installed at the lower part of the electric slide valve II. The electric slide valve II can control the speed and amount of carbide slag entering the buffer tank. The carbide slag buffer tank plays a role in temporary storage and buffering, ensuring the continuity and stability of the supply of carbide slag.

[0046] The top of the carbide slag buffer tank of this utility model is simultaneously connected to nitrogen gas at 0.6 MPa. The introduction of nitrogen gas can play a protective role by preventing the carbide slag from reacting with components in the air, and can also maintain the pressure balance of the buffer tank. A pneumatic control valve is installed at the bottom of the carbide slag buffer tank, which can precisely control the amount of carbide slag discharged from the buffer tank.

[0047] This utility model relates to a pneumatic control valve connected to a pneumatic conveying pipeline and 0.6 MPa nitrogen gas. The 0.6 MPa nitrogen gas is used as the conveying power to form a stable airflow in the pneumatic conveying pipeline, which transports the carbide slag along the pipeline to the downstream deep processing reactor connected at the end, thereby reducing the enterprise's production costs and improving the cleanliness of the site. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0050] As attached Figure 1 As shown, this embodiment of a dry acetylene carbide slag pneumatic conveying system includes a carbide slag storage silo 1, with an electric gate valve 2 connected to its lower part. An adjustable frequency rotary feeder 3 is installed below the electric gate valve 2. A screw conveyor 4 is installed below the rotary feeder 3. A slag discharge pipe 5 is connected to the end of the screw conveyor 4. An electric gate valve 6 is connected to the lower part of the slag discharge pipe 5. A carbide slag buffer tank 7 is installed below the electric gate valve 6. A 0.6 MPa nitrogen pipeline 8 is connected to the top of the carbide slag buffer tank 7, and a pneumatic control valve 9 is installed at the lower part of the buffer tank 7. A pneumatic conveying pipeline 10 and the 0.6 MPa nitrogen pipeline 8 are connected below the pneumatic control valve 9. A reaction vessel 11 is connected to the end of the pneumatic conveying pipeline 10.

[0051] In this embodiment, the structure includes a carbide slag storage silo 1, with an electric slide gate valve 2 connected to its lower part. The electric slide gate valve 2 is connected to a rotary feeder 3 at its lower part. The rotary feeder 3 allows for precise control of the flow rate of carbide slag from the storage silo 1 into the screw conveyor 4, achieving stable feeding.

[0052] An electric slide gate valve is a device that uses an electric actuator to drive a valve plate to move up and down within the valve body, thereby opening and closing the valve. Its working principle is as follows:

[0053] Startup process:

[0054] When the electric actuator receives an opening signal, the motor drives the valve stem to move upward, causing the valve plate to lift from the valve seat, thus opening the valve and allowing material or fluid to pass through the valve body.

[0055] Shutdown process:

[0056] When the electric actuator receives a closing signal, the motor drives the valve stem to move downward, and the valve plate fits tightly against the valve seat to achieve a seal and prevent material or fluid from passing through.

[0057] The valve bodies of electric slide gate valves 1, 2, and 6 are equipped with flanges and are connected to the pipeline via flanges and bolts. Before connection, check whether the bolts at each connection point are loose and tighten them.

[0058] Electric slide gate valves can be installed horizontally or vertically, but it must be ensured that the valve is in the closed position. During installation, the valve stem can be upward or horizontal, but space must be reserved for the drive mechanism.

[0059] Control method:

[0060] Electric slide gate valves are typically equipped with limit switches and position feedback devices to precisely control the opening and closing positions of the valve plate and feed the signals back to the control system to achieve automated operation.

[0061] In this embodiment, a screw conveyor 4 is installed below the star-shaped feeder 3, and the end of the screw conveyor 4 is connected to the slag discharge pipe 5. The star-shaped feeder 3 evenly conveys the calcium carbide slag to the screw conveyor 4, and the screw conveyor 4, through the rotation of the screw blades, conveys the calcium carbide slag along the pipe to the slag discharge pipe 5 for further transmission.

[0062] The rotary valve (also known as a star feeder, rotary unloader, airlock valve, etc.) is a quantitative feeding and unloading device for powdery and granular materials. Its working principle is as follows:

[0063] Material filling: The material falls from the upper hopper into the blades of the star feeder by its own gravity.

[0064] Rotary discharge: The motor drives the impeller to rotate through the reducer, and the material is carried to the lower part and discharged as the blades rotate.

[0065] Airlock function: When unloading, the star-shaped feeder 3 can isolate the air pressure between the upper and lower parts, thus playing an airlock role and preventing gas leakage.

[0066] In this embodiment, the lower part of the slag discharge pipe 5 is connected to an electric slide gate valve 6, and a carbide slag buffer tank 7 is installed below the electric slide gate valve 6. The electric slide gate valve 6 can control the speed and amount of carbide slag entering the buffer tank 7. The carbide slag buffer tank 7 plays a role in temporary storage and buffering, ensuring the continuity and stability of the carbide slag supply.

[0067] In this embodiment, a pneumatic conveying pipeline and a 0.6 MPa nitrogen pipeline 8 are connected below the pneumatic control valve 9. The 0.6 MPa nitrogen pipeline 8 is used as the conveying power to form a stable airflow in the pneumatic conveying pipeline 10, which conveys the carbide slag along the pipeline to the reactor 11 connected at the end.

[0068] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A dry acetylene carbide slag pneumatic conveying system, characterized in that: The system includes a calcium carbide slag storage silo, a slag conveyor, a calcium carbide slag buffer tank, a pneumatic conveying pipeline, and a reactor. The lower outlet of the calcium carbide slag storage silo is connected to an electric slide valve, below which is a feeder. Below the feeder is the slag conveyor, and at its end is a slag discharge pipe. The outlet of the slag discharge pipe is connected to an electric slide valve, below which is the calcium carbide slag buffer tank. The lower outlet of the calcium carbide slag buffer tank is connected to a control valve, below which is the pneumatic conveying pipeline. Below the control valve is also a nitrogen pipeline, and at its end is the reactor.

2. The dry acetylene carbide slag pneumatic conveying system according to claim 1, characterized in that: The feeder is a star-shaped feeder.

3. The dry acetylene carbide slag pneumatic conveying system according to claim 1, characterized in that: The nitrogen pipeline is also connected to the top inlet of the carbide slag buffer tank.

4. A dry acetylene carbide slag pneumatic conveying system according to claim 3, characterized in that: The nitrogen pipeline delivers 0.6 MPa nitrogen to the carbide slag buffer tank and the pneumatic conveying pipeline.

5. A dry acetylene carbide slag pneumatic conveying system according to claim 1, characterized in that: The control valve is a pneumatic control valve.

6. The dry acetylene carbide slag pneumatic conveying system according to claim 1, characterized in that: The slag conveyor mentioned is a screw conveyor.

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