Coal yard coal supply system without interruption of production

Abstract

The utility model discloses a coal yard coal supply system without interrupting production, which is characterized in that a second blanking hopper (5) is communicated below the ground level of a dry coal shed (1), the discharge port of the second blanking hopper (5) is connected with the feed port of a screening and crushing all-in-one machine, and the screening and crushing all-in-one machine consists of a screening component (6) and a crushing component (7); and a material receiving belt (8) is arranged below a discharge port of the screening assembly (6) and a discharge port of the crushing assembly (7) and is connected to the furnace feeding belt (4) through a bridging belt (9). The utility model provides a thought that a set of screening and crushing equipment is additionally arranged at the front end of the extension line of the belt conveyor around the existing ground coal hopper, and a set of switching fine screening and crushing system is additionally arranged aiming at the upgrading of the old system technology, so that the production is not interrupted, and the production safety is ensured.

Description

Technical Field

[0001] This utility model relates to the fields of coarse and fine separation and coarse crushing in industries such as thermal power plants, mines, coal, metallurgy, and coking, and in particular to a coal yard coal supply system that can keep production running without interruption. Background Technology

[0002] Coal is the primary fuel for thermal power generation. A large coal storage shed is required when coal arrives at the mine, typically storing 7-45 days' worth of coal. Currently, coal conveying systems commonly use two-screen, two-crushing structures and three-crushing, three-screen structures to ensure output and control particle size. The two-screen, two-crushing structure is suitable for outputs of 100-600 t / h, while the three-screen, three-crushing structure is generally suitable for outputs of 300-1200 t / h.

[0003] The commonly used two-screen, two-crushing process is as follows: The feeding system (bulldozer, grab bucket, bucket wheel excavator, and truck unloading) feeds coal into the ground coal hopper. Below the ground coal hopper is a vibrating feeder, and below the vibrating feeder is the No. 1 coal conveyor belt. The No. 1 coal conveyor belt conveyor transports the coal to the No. 1 coarse crushing tower. The coarse crushing tower (which screens and crushes incoming material from 0-350mm to 0-50mm) has four layers: the fourth layer is the incoming material layer, the third layer is the coarse screening layer, the second layer is the coarse crushing layer, and the first layer is the outgoing material layer. The incoming material layer is the No. 1 conveyor belt, the coarse screening layer is the coarse screening machine, and the coarse crushing layer is the coarse crushing layer. The crusher and discharge layer are connected by belt conveyor #2. Belt conveyor #2 transports coal to the fine crushing tower, which (crushes incoming material from 0-100mm to 0-15mm) is divided into four layers: the fourth layer is the incoming material layer, the third layer is the fine screening layer, the second layer is the fine crushing layer, and the first layer is the discharge layer. The incoming material layer is connected by belt conveyor #2, the fine screening layer is the fine screening machine, the fine crushing layer is the fine crusher, and the discharge layer is connected by belt conveyor #3. The discharge belt conveyor then transports the coal to the transfer tower, which then supplies the coal to the fourth boiler silo belt conveyor, the boiler silo, the weighing coal feeder, the boiler coal inlet chute, and the boiler combustion chamber.

[0004] The shortcomings of the existing process are mainly concentrated in the following aspects: 1. The investment in the coal conveying system is too large, including two crushing buildings, screening and crushing equipment, dust removal equipment, hoisting equipment, electrical control system, etc.

[0005] 2. The construction period is long, usually requiring 8-15 months.

[0006] 3. High operating costs, including electricity consumption, maintenance, and spare parts. A typical two-screen, two-crushing system, assuming a 500t / h coal conveyor line, roughly calculates the civil engineering and equipment costs: two crushing buildings at 8 million RMB; coarse and fine screening and crushing equipment at 9 million RMB; and auxiliary dust removal equipment, hoisting equipment, water and electricity equipment, and electrical control systems at 6.5 million RMB. Operating costs require an additional 5 workers per day for equipment maintenance, the screening and crushing motors require 900-1100kw per hour, and spare parts costs are estimated at 1.2-1.5 million RMB per year. In total, the operating cost for a single coal conveyor line is approximately 29 million RMB or more. Summary of the Invention

[0007] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a solution for adding a set of screening and crushing equipment at the front end of the belt conveyor extension line around the existing coal hopper. This solution is intended to upgrade the old system by adding a new fine screening and crushing system without interrupting production and ensuring production safety.

[0008] The purpose of this utility model is achieved through the following technical solution: a coal supply system for a coal yard that does not interrupt production, including a dry coal shed, a first hopper connected below the ground level of the dry coal shed, a vibrating feeder connected to the outlet of the first hopper, a furnace feed belt installed below the outlet of the vibrating feeder, a second hopper also connected below the ground level of the dry coal shed, the outlet of the second hopper connected to the inlet of a screening and crushing integrated machine, the screening and crushing integrated machine consisting of a screening component and a crushing component, a receiving belt installed below the outlets of the screening component and the crushing component, the receiving belt being connected to the furnace feed belt via a bridging belt.

[0009] The integrated screening and crushing machine is equipped with a coal feed rate adjustment device at the feed inlet, which can be used to manually or electrically adjust the cross-sectional area of ​​the feed inlet.

[0010] The coal feed rate adjustment device is an adjustable gate, specifically a telescopic gate or a rotatable gate. The output capacity is adjusted by regulating the opening and closing degree of the gate at the feed inlet of the integrated screening and crushing machine. Below the gate is the screen surface of the screening component, which consists of 2-20 screen shafts. The speed of the screen surface remains constant. The output capacity is not limited to changing the opening and closing degree of the gate or the speed of the screening machine.

[0011] The coal feed rate regulating device is an electric regulating device. The screening component and crushing component are each equipped with a drive motor. The crushing component has a drive motor current detection device, the output of which is connected to a microcontroller. The signal output of the microcontroller is connected to the coal feed rate regulating device and the drive motor of the screening component. To prevent coal blockage in the integrated screening and crushing machine, this process uses monitoring the current of the crusher's main motor to control the dynamics of the gate and screen surface. When the crusher's main motor current exceeds a set current threshold, the gate regulating device and the screen surface of the screening machine stop feeding coal into the crushing chamber. After the crusher current returns to normal, the gate regulating device and the screen surface of the screening machine resume operation, continuously feeding coal into the crushing chamber.

[0012] The dry coal shed is equipped with feeding equipment, including bulldozers, grab trucks, bucket wheel excavators, or coal unloading trucks.

[0013] The screening components include vibrating screens, roller screens, cross screens, impeller screens, drum screens, or double rotary screens.

[0014] The crushing components include a ring hammer crusher, a reversible crusher, or a four-tooth roll crusher.

[0015] The coal yard mentioned refers to the dry coal shed and open-air coal yard within the plant area, also known as the coal storage yard, with the dry coal shed being a preferred option. The dry coal shed contains 1-12 coal hoppers, and the fixed grid on the hoppers is 150-350mm square. Preferably, the dry coal shed's hopper consists of a conical hopper and coal grates, with the grates being 150-350mm square. The hopper is not limited to a conical silo welded from steel plates; it can also be a concrete-cast brick-concrete structure or a curved conical shape.

[0016] The aforementioned integrated screening and crushing machine has a coarse screening and coarse crushing capacity of 200-1000 t / h and a discharge particle size of 0-50 mm. Preferably, this application uses a fine screening and fine crushing integrated machine with a capacity of 100-500 t / h and a discharge particle size between 0-13 mm. The screening component has a forced conveying screen, with the conveying direction from the inlet to the outlet. Particles smaller than the screen opening pass through the screen, while coal larger than the screen opening is conveyed to the inlet of the crushing component.

[0017] The aforementioned integrated screening and crushing machine refers to a screening machine placed on top of a crusher, with the screening machine and crusher forming a combined structure. After the screening machine and crusher are connected, they share a common coal chute to the belt conveyor, or the material screened by the screening machine and the material crushed by the crusher each go through a separate coal chute to the belt conveyor.

[0018] The beneficial effects of this utility model are: compared with the original screening and crushing equipment, the integrated screening and crushing machine has the advantages of higher efficiency, smaller size and greater energy saving.

[0019] This utility model expands and upgrades the existing coal hopper by adding a more efficient and powerful integrated screening and crushing machine, which solves the problems of coal blockage, insufficient output, excessive particle size, and excessive energy consumption in the existing two-screen and two-crushing system. It provides a set of screen and crushing systems that can be switched to ensure that the power plant can continue to operate even if it is shut down due to old coal conveying problems.

[0020] Once the screening and crushing equipment under the coal hopper in the new dry coal shed is put into operation, the coarse crushing tower and fine crushing tower screening and crushing equipment can be shut down, thereby achieving the goal of saving electricity and reducing operation and maintenance costs.

[0021] In addition, it has saved plant electricity, with motor power decreasing by more than 800 kW per hour; it has saved on operation and maintenance costs, with only one person now needed to monitor the equipment instead of five in shifts; it has saved on spare parts costs, with the cost of a single spare part decreasing from 1.5 million yuan to 350,000 yuan per year; it has improved the pass rate, with the adoption of new screening and crushing technology increasing the pass rate from 85% to 98%, improving boiler combustion efficiency and saving more than 20 million yuan in coal annually; and it has increased system output, with the boiler now requiring only 10 hours to feed 5,000 tons of coal instead of 15 hours per day, saving plant electricity consumption. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the assembly structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the coal feed rate regulating device of this utility model;

[0024] In the diagram, 1-dry coal shed, 2-first feeding hopper, 3-vibrating feeder, 4-furnace feed belt, 5-second feeding hopper, 6-screening assembly, 7-crushing assembly, 8-receiving belt, 9-bridging belt, 10-coal feed rate regulating device. Detailed Implementation

[0025] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] See Figure 1-2 This utility model provides a technical solution: such as Figure 1 As shown, the coal supply system for the coal yard that does not interrupt production includes a dry coal shed 1. A first hopper 2 is connected below the ground level of the dry coal shed 1. A vibrating feeder 3 is connected to the discharge port of the first hopper 2. An inlet conveyor belt 4 is installed below the discharge port of the vibrating feeder 3. A second hopper 5 is also connected below the ground level of the dry coal shed 1. The discharge port of the second hopper 5 is connected to the inlet of a screening and crushing integrated machine. The screening and crushing integrated machine consists of a screening component 6 and a crushing component 7. A receiving conveyor belt 8 is installed below the discharge ports of the screening component 6 and the crushing component 7. The receiving conveyor belt 8 is connected to the inlet conveyor belt 4 through a bridging conveyor belt 9.

[0027] The integrated screening and crushing machine is equipped with a coal feed rate adjustment device 10 at the feed inlet, which is used to manually or electrically adjust the cross-sectional area of ​​the feed inlet of the integrated screening and crushing machine.

[0028] The coal feed rate regulating device 10 is an adjustable gate, specifically a telescopic gate or a rotatable gate. Figure 2 This is a schematic diagram of one embodiment.

[0029] The coal feed rate regulating device 10 is an electric regulating device. The screening component 6 and the crushing component 7 are respectively equipped with drive motors. The crushing component 7 is equipped with a drive motor current detection device. The output terminal of the motor current detection device is connected to a microcontroller. The signal output terminal of the microcontroller is connected to the drive motors of the coal feed rate regulating device 10 and the screening component 6.

[0030] The dry coal shed 1 is equipped with feeding equipment, including bulldozers, grab trucks, bucket wheel excavators, or coal unloading trucks.

[0031] The screening component 6 includes a vibrating screen, roller screen, cross screen, impeller screen, drum screen, or double rotary screen. The crushing component 7 includes a ring hammer crusher, reversible crusher, or four-tooth roller crusher.

[0032] The above description is merely a preferred embodiment of this utility model. It should be understood that this utility model is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this utility model should be protected within the scope of the appended claims.

Claims

1. A coal supply system for a coal yard that does not interrupt production, comprising a dry coal shed (1), wherein a first hopper (2) is connected below the ground level of the dry coal shed (1), a vibrating feeder (3) is connected to the outlet of the first hopper (2), and a furnace feed belt (4) is provided below the outlet of the vibrating feeder (3), characterized in that: The dry coal shed (1) is connected to a second hopper (5) below the ground level. The discharge port of the second hopper (5) is connected to the inlet of the integrated screening and crushing machine. The integrated screening and crushing machine is composed of a screening component (6) and a crushing component (7). A receiving belt (8) is provided below the discharge ports of the screening component (6) and the crushing component (7). The receiving belt (8) is connected to the furnace belt (4) through a bridging belt (9).

2. The coal yard coal supply system for uninterrupted production according to claim 1, characterized in that: The integrated screening and crushing machine is equipped with a coal feed rate adjustment device (10) at the feed inlet, which is used to manually or electrically adjust the cross-sectional area of ​​the feed inlet of the integrated screening and crushing machine.

3. The coal yard coal supply system for uninterrupted production according to claim 2, characterized in that: The coal feed rate regulating device (10) is an adjustable gate, specifically a telescopic gate or a rotatable gate.

4. The coal yard supply system for uninterrupted production according to claim 2, characterized in that: The coal feed rate regulating device (10) is an electric regulating device. The screening component (6) and the crushing component (7) are respectively equipped with drive motors. The crushing component (7) is equipped with a drive motor current detection device. The output end of the motor current detection device is connected to the microcontroller. The signal output end of the microcontroller is connected to the drive motors of the coal feed rate regulating device (10) and the screening component (6).

5. The coal yard coal supply system for uninterrupted production according to claim 1, characterized in that: The screening component (6) includes a vibrating screen, a roller screen, a cross screen, an impeller screen, a drum screen, or a double rotary screen.

6. The coal yard supply system for uninterrupted production according to claim 1, characterized in that: The crushing component (7) includes a ring hammer crusher, a reversible crusher, or a four-tooth roll crusher.

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