A new type of bulk cement tank of unloading type

Abstract

The present application relates to a cement tank, in particular to a new type of unloading type bulk cement tank, comprising a tank body for storing cement, the bottom of the tank body is provided with a plurality of discharge ports, the discharge port has a taper surface with a gradually reduced opening diameter from top to bottom, the taper surface has a two-section structure, and is respectively called first taper surface and second taper surface from top to bottom, the application optimizes the structure and type of the inside of the tank bottom, reduces the cement accumulation to the minimum, greatly reduces the layout area of the air tank at the bottom of the tank, reduces the air consumption of the air tank, optimizes the control mode of air supply, reduces the air and electricity consumption of the air compressor, saves the operation cost of the cement transfer or dispersion process; the type of bulk cement circular tank has simple structure, less process equipment, reliable use and operation, easy operation, inspection and maintenance, is efficient, fast and safe, and solves the problem of environmental pollution in the cement dusting, tank transferring, tank unloading and transferring operation process.

Description

Technical Field

[0001] This invention relates to a cement silo, and more particularly to a novel unloading type bulk cement silo. Background Technology

[0002] Currently, most cement companies and cement transfer stations use round tanks to store or transport bulk cement. In order to make full use of the storage capacity and avoid the cement from deteriorating in quality during storage, the bottom structure of the tank is very important, and the amount of cement accumulated should be minimized.

[0003] Under normal circumstances, the storage capacity is 2000 tons. Large-capacity bulk cement round silos of level 1 and above have a 9° tapered bottom structure from the outer ring to the center discharge port. A large air-filled box (also known as an open chute) is arranged around the center discharge port to prevent material flow blockage. After the air compressor supplies compressed air, the compressed air penetrates the permeable layer of the air-filled box and enters the cement to aerate it. The fluidized cement flows continuously from the center discharge port (1-2) at the bottom of the silo and is loaded into cement truck tankers by a bulk cement loading machine. This type of discharge round cement silo has the following problems:

[0004] 1. The air box at the bottom of the cement silo has a large area, accounting for about 80% of the total bottom area. The air layer (canvas) of the air box is likely to be damaged. Once damaged, it is difficult to replace and the repair time is long, and it can only be done after the cement in the silo has been naturally emptied.

[0005] 2. After the air-permeable layer (canvas) of the air-filled box is damaged, it is difficult for cement to be discharged smoothly from the cement silo, resulting in serious cement accumulation in the silo. According to actual calculations, the cement accumulation in a single silo can reach 300 to 500 tons, which cannot fully utilize the maximum storage capacity of the cement silo, thereby increasing the storage cost of bulk cement.

[0006] 3. Damage to the air-permeable layer (canvas) of the air-filled tank, or natural evacuation of cement from the tank under normal circumstances, will result in a large accumulation of material in the tank, requiring tank cleaning. Tank cleaning is expensive (up to 100,000 yuan per tank), involves a large workload, and has an extremely high safety risk factor. Tank cleaning has become the most dangerous maintenance operation in the cement industry, and there have been many personal injury accidents in recent years.

[0007] 4. Based on the air consumption per unit area of ​​the air-permeable layer (canvas) of the air-filled box being 2.0 m³ / m²·min, and the total resistance P that the fluidized material column inside the air-filled box needs to overcome being 20 kPa / m × 2.5 m = 50 kPa, the selection calculation is performed for a storage capacity of 2000 t. The round cement silo needs to be equipped with an air compressor with a flow rate of 20 m3 / min, an air supply pressure of 49.9 kPa, and a motor power of 37 kW. The high cost of air and electricity greatly increases the operating cost of bulk cement dispersal operations.

[0008] 5. The dust collection equipment at the top and bottom of the tank is absent or has a small processing capacity (processing air volume of 3000-5000 m3 / h), resulting in a large amount of cement dust escaping during the transfer operation of cement ash entering and leaving the tank, seriously polluting the surrounding atmospheric environment, and the environmental emission during the operation cannot meet the standards.

[0009] Therefore, a new type of circular silo cement silo with reliable operation, low operating cost, high technological level, clean and environmentally friendly transfer operation, and simple and efficient equipment fault detection and maintenance is particularly important. Summary of the Invention

[0010] To address the shortcomings of existing technologies, this invention provides a novel unloading type bulk cement silo.

[0011] To achieve the above objectives, the technical solution adopted by the present invention is: a novel unloading type bulk cement tank, characterized in that it includes a tank body for storing cement, and the bottom of the tank body is provided with a plurality of discharge ports. The discharge ports have a conical surface with an opening diameter that gradually decreases from top to bottom. The conical surface has a two-section structure, and from top to bottom they are respectively referred to as the first conical surface and the second conical surface. The taper of the first conical surface is smaller than the taper of the second conical surface.

[0012] The number of discharge ports is 5, one of which is located at the center of the bottom of the tank, and the other 4 are arranged symmetrically in a ring with the center of the bottom of the tank as the center.

[0013] The taper of the first conical surface is 58 degrees.

[0014] The taper of the second cone is 68 degrees.

[0015] The bottom of each discharge port is equipped with an air-filled box device for controlling cement discharge, and a first flow control valve that works in conjunction with the air-filled box device. The periphery and bottom of the discharge port are also equipped with a collection bin for collecting all the cement from the discharge port. The cement is collected in the collection bin through the cooperation of the first material trough and the first flow control valve.

[0016] The bottom of the material collection bin is equipped with a bulk ash loading machine for loading transport vehicles. The bulk ash loading machine is connected to the material collection bin through a second material trough and a second flow control valve. The loading capacity of the transport vehicle is controlled by the cooperation of the material collection bin, the second material trough and the second flow control valve.

[0017] A weighing scale is installed between the second flow control valve and the bulk ash loading machine.

[0018] The top of the tank is equipped with a first exhaust dust collector.

[0019] The number of the first exhaust dust collectors is 2.

[0020] The material collection silo is equipped with two second exhaust dust collectors.

[0021] The beneficial effects of this invention are as follows: This invention optimizes the internal structure and form of the tank bottom, minimizing cement accumulation, significantly reducing the area of ​​the tank bottom air filling box, reducing the air consumption of the air filling box, and optimizing its air supply control method, reducing the air and electricity consumption of the air compressor, and saving operating costs in the cement transfer or distribution process; its type of bulk cement circular tank has a simple structure, requires fewer process equipment, is reliable in use and operation, and is simple, efficient, quick, and safe in operation, inspection, and maintenance, solving the environmental pollution problem in the process of cement ash entering and leaving the tank. Attached Figure Description

[0022] Figure 1 This is the front view of the present invention;

[0023] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0024] Figure 3 This is a top view of the present invention. Detailed Implementation

[0025] like Figures 1-3 As shown, a novel unloading type bulk cement silo includes a silo body 100 for storing cement. The bottom of the silo body 100 is provided with several discharge ports 110. Each discharge port 110 has a conical surface with an opening diameter that gradually decreases from top to bottom. The conical surface has a two-section structure and is referred to as the first conical surface 111 and the second conical surface 112 from top to bottom. The taper of the first conical surface 111 is smaller than that of the second conical surface 112. The air filling box device 200 is a device that uses compressed air from an air compressor and a pneumatic ball valve to discharge cement. It is a relatively mature technology in the cement industry and will not be described in detail here. The cross-section of the silo body 100 is preferably circular.

[0026] The number of discharge ports 110 is 5, one of which is located at the center of the bottom of the tank 100, and the other 4 are arranged symmetrically in a ring with the center of the bottom of the tank 100 as the center. Preferably, there are 5 discharge ports inside the tank bottom, with each discharge port as the center point of a conical funnel. The tank bottom structure is designed as a relatively independent conical funnel (at the center of the tank bottom), and the other 4 are relatively connected conical funnels arranged in a ring. Cement is delivered to the discharge port after air supply or directly. This new circular tank bottom structure ensures that as much cement as possible flows out of the discharge port under the assistance of gravity and air force in the tank 100, thereby minimizing the amount of cement accumulated at the bottom of the tank.

[0027] The taper of the first conical surface 111 is 58 degrees.

[0028] The taper of the second conical surface 112 is 68 degrees.

[0029] Each discharge port 110 is equipped with an air-filled box device 200 for controlling cement discharge at its bottom, and a first flow control valve 210 that cooperates with the air-filled box device 200. The periphery and bottom of each discharge port 110 are also equipped with a collection bin 300 for collecting all the cement from the discharge ports 110. The cement is collected in the collection bin 300 through the cooperation of the first material trough 220 and the first flow control valve 210. The collection bin 300 can concentrate the cement in the tank 100 for centralized discharge. This layout results in a tank bottom air-filled box area of ​​only 8m². 2 The selected air compressor has a flow rate of 6 m³ / min, a supply pressure of 49.9 kPa, and a motor power of 11.0 kW. This reduces air consumption by 70% and electricity consumption by 26 kWh / hour, significantly lowering air and electricity costs. This air compressor uses a variable frequency motor; as the material layer height and pressure decrease within the tank 100, the motor speed can be adjusted, further reducing air costs without affecting cement discharge. Additionally, if tank bottom cleaning is planned, and the cement within the tank 100 is naturally vented (with a material layer height of approximately 2.0 m), another low-pressure air compressor can be turned on (controlling the fluidized material column height to ≤1 m). The selected model has a flow rate of 6 m³ / min, an air supply pressure of 20.0 kPa, and a motor power of 5.5 KW, ensuring smooth cement discharge and reducing cement accumulation in the tank 100 to 100t. This significantly reduces the workload of cleaning and lowers the safety risks of operation. Apart from the air permeable layer 230 (canvas) of the air box device 200, which is a vulnerable part, and there are only 8 such layers inside the bottom of the tank 100, there are no other vulnerable parts or equipment. Under normal circumstances, the inspection and repair of a damaged air permeable layer 230 can be completed within half a working day, which is simple and quick. Other supporting equipment can be completed in the safe space outside the bottom of the tank 100, making inspection and repair work safe and convenient.

[0030] The bottom of the material collection bin 300 is equipped with a bulk ash loading machine 400 for loading the transport vehicle 500. The bulk ash loading machine 400 and the material collection bin 300 are connected to the second material trough 310 and the second flow control valve 320. The loading capacity of the transport vehicle 500 is controlled by the cooperation of the material collection bin 300, the second material trough 310 and the second flow control valve 320.

[0031] A weighing scale 330 is provided between the second flow control valve 320 and the bulk cement loading machine 400. The weighing scale 330 measures the weight of the cement output. The cooperation between the weighing scale 330 and the second flow control valve 320 controls the loading capacity of the transport vehicle 500, which is highly practical.

[0032] The top of the tank 100 is equipped with a first exhaust dust collector 600.

[0033] The number of the first exhaust dust collector 600 is 2, and the number of the first exhaust dust collector 600 is preferably 2.

[0034] The material collection silo 300 is equipped with two second exhaust dust collectors 700, preferably two in number. These are new high-efficiency air-box pulse bag dust collectors with large processing capacity, fixedly installed at the top and bottom of the tank 100, respectively. They are equipped with anti-condensation filter bags. Two units are installed at the top of the tank 100, with a processing capacity of (7000~9000m3 / h)×2. The second exhaust dust collectors 700 at the bottom of the tank have a processing capacity of (5500~7000m3 / h)×2. The surrounding environment of the operation meets the requirements of ultra-low emission.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Simple modifications and substitutions made by those skilled in the art without departing from the spirit and scope of the invention are within the protection scope of the present invention.

Claims

1. A novel unloading type bulk cement silo, characterized in that, The container includes a tank (100) for storing cement. The bottom of the tank (100) is provided with several discharge ports (110). Each discharge port (110) has a conical surface with an opening diameter that gradually decreases from top to bottom. The conical surface has a two-section structure and is referred to as the first conical surface (111) and the second conical surface (112) from top to bottom. The taper of the first conical surface (111) is smaller than that of the second conical surface (112). There are 5 discharge ports (110), one of which is located at the center of the bottom of the tank (100), and the other 4 are arranged symmetrically in a ring with the center of the bottom of the tank (100) as the center.

2. The novel unloading type bulk cement silo as described in claim 1, characterized in that, The taper of the first conical surface (111) is 58 degrees.

3. A novel unloading type bulk cement silo as described in claim 2, characterized in that, The taper of the second conical surface (112) is 68 degrees.

4. A novel unloading type bulk cement silo as described in any one of claims 1 to 3, characterized in that, The periphery and bottom of the discharge port (110) are provided with an air-filled box device (200) for controlling cement discharge, and a first flow control valve (210) that cooperates with the air-filled box device (200). The bottom of the discharge port (110) is also provided with a collection bin (300) for collecting all the cement from the discharge port (110). The cement is collected in the collection bin (300) through the cooperation of the first material trough (220) and the first flow control valve (210).

5. A novel unloading type bulk cement silo as described in claim 4, characterized in that, The bottom of the material collection bin (300) is equipped with a bulk ash loading machine (400) for loading the transport vehicle (500). The bulk ash loading machine (400) and the material collection bin (300) are connected through a second material trough (310) and a second flow control valve (320). The loading capacity of the transport vehicle (500) is controlled by the cooperation of the material collection bin (300), the second material trough (310) and the second flow control valve (320).

6. A novel unloading type bulk cement silo as described in claim 5, characterized in that, A weighing scale (330) is provided between the second flow control valve (320) and the bulk ash loading machine (400).

7. A novel unloading type bulk cement silo as described in claim 4, characterized in that, The tank (100) is equipped with a first exhaust dust collector (600) on top.

8. A novel unloading type bulk cement silo as described in claim 7, characterized in that, The number of the first exhaust dust collector (600) is 2.

9. A novel unloading type bulk cement silo as described in claim 7, characterized in that, The material collection hopper (300) is equipped with a second exhaust dust collector (700), and there are two of them.

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