Environment-friendly sealing device for distribution trolley of coal tower

Abstract

The invention relates to an environment-friendly sealing device for a material distribution trolley of a coal tower. The environment-friendly sealing device comprises an annular sealing assembly, a sealing belt conveyor and a cloth bag dust removal system, the annular sealing assembly comprises a sealing cover plate, a frame, walking wheels and a rail. The sealing belt conveyor is positioned on the sealing cover plate; the bag-type dust removal system comprises a fan and a bag-type dust remover; and the cloth bag dust removal system is provided with a plurality of dust suction ports. According to the environment-friendly sealing device for the material distribution trolley of the coal tower, the starting, stopping, high-speed and low-speed time of a dust removal fan can be dynamically set, the efficiency of a dust removal system is improved, meanwhile, the negative pressure in the dust removal sealing system is controlled according to the material distribution amount of the coal tower and the fluctuation condition of a material line, full sealing during annular material distribution of the material distribution trolley is achieved, and coal powder is prevented from overflowing to the maximum extent.

Description

Technical Field

[0001] The present invention relates to an environmentally friendly closed device for a coal tower distribution trolley, belonging to the technical field of environmental protection equipment. Background Art

[0002] The annular distribution trolley of the coke oven coal tower is installed on the top of the coal tower. As Figure 1 shown, it consists of a rotary carriage, a belt conveyor, an annular track, a control system, etc. Its main function is to evenly distribute the pulverized coal transported by the upstream belt conveyor inside the large bin of the coal tower.

[0003] Since the annular distribution trolley needs to continuously distribute the coal in an annular manner into the large bin of the coal tower, the upper opening of the coal tower is generally designed with an open mouth and a grid plate layout, making it difficult to perform an overall rotational seal. The pulverized coal enters the interior of the coal tower, with a maximum drop exceeding 30 meters. Due to the ineffective enclosure of the coal tower and the intermittent impact and swirling positive pressure in the bin, a large amount of dust will overflow from the top of the coal tower, resulting in a poor on-site environment.

[0004] Since the relative elevation of the coal tower from the ground generally exceeds 50 meters, and the surrounding areas on both sides of the coke oven body are the activity areas of the four large vehicles, and the raw coal itself has a relatively high moisture content. If the dust removal pipeline is too long, it is easy to accumulate materials inside the pipeline, and it is not easy to use a conventional ground dust removal station for centralized treatment of flue gas.

[0005] Existing domestic and foreign technologies for treating the dust and flue gas during the material dropping of annular distribution machines include the spray dust suppression technology inside the coal tower and the installation of single dust collectors on the belt conveyor body, etc. The spray dust suppression increases the moisture content of the raw coal, which has a negative impact on the production of the coke oven; installing single dust collectors on the belt conveyor body, etc. does not fundamentally solve the problems of sealing during the feeding of the large bin of the coal tower and the fluctuating positive pressure inside the bin. Summary of the Invention

[0006] The technical problem to be solved by the present invention is: to overcome the above-mentioned technical drawbacks and provide a closed device that can effectively avoid dust generation during material distribution.

[0007] To solve the above technical problem, the technical solution proposed by the present invention is: an environmentally friendly closed device for a coal tower distribution trolley, comprising: an annular sealing assembly, a sealed belt conveyor, and a bag dust removal system; The annular sealing assembly includes a closed cover plate, a frame, traveling wheels, and a track; the frame bears the closed cover plate; the closed cover plate and the frame are located at the upper opening of the coal tower and form a sealed space at the upper opening of the coal tower; the traveling wheels are installed at the bottom of the frame and can move along the track, and the track is annular; The sealed belt conveyor is located on the closed cover plate; both ends of the sealed belt conveyor are discharge ports; the discharge ports penetrate through the closed cover plate; the sealed belt conveyor can rotate around the center of the upper opening of the coal bunker, and as the sealed belt conveyor rotates, the discharge ports at both ends thereof move along circular trajectories with different radii; the inlet of the sealed belt conveyor is connected to the upstream coal blending system belt conveyor. The bag dust removal system includes a fan and a bag dust collector; the bag dust removal system has a number of dust suction ports, which are respectively arranged at the four corners of the upper opening of the coal bunker and the inlet of the sealed belt conveyor; the fan provides the dust removal power and sends the gas sucked from the dust suction ports to the bag dust collector. When starting to feed the material, the fan of the bag dust removal system starts and maintains the lowest speed, and the speed of the fan increases when the material reaches the feeding trolley. In the case of fluctuations in the feeding amount, assuming the negative pressure generated by the fan is P, the formula between P, the material flow rate M, and the unit time fluctuation value Δh of the material level is P = P L *(1 + η * M / M H + β * Δh / H H ), where P L is the negative pressure generated when the fan is at the lowest speed; M H is the maximum value of the material flow rate, H H is the highest material level of the coal bunker, η is the negative pressure adjustment coefficient, and β is the material line fluctuation adjustment coefficient.

[0008] A further improvement of the above solution is that: annular sealing plates are provided on the sides of the traveling wheels at the bottom of the frame and on both sides of the discharge ports of the sealed belt conveyor; the upper half of the annular sealing plate is made of stainless steel and is connected to the frame, and the upper half is made of rubber and is connected to the upper half by bolts.

[0009] A further improvement of the above solution is that: the sealed belt conveyor includes a belt head and tail wheel sealing cover, an upper fully enclosed material guiding trough, detachable baffles on both sides of the belt conveyor, and a belt conveyor dust return receiving plate; the belt head and tail wheel sealing cover is a fully enclosed structure, forming a sealed space at the head and tail of the belt conveyor, and cleaning devices are respectively arranged at the head pulley and tail pulley parts of the belt conveyor, and the materials swept by the cleaning devices fall into the coal bunker; the belt head and tail wheel sealing cover and the upper fully enclosed material guiding trough form a sealed space with the detachable baffles on both sides of the belt conveyor and the belt conveyor dust return receiving plate.

[0010] A further improvement of the above solution is that: the negative pressure adjustment coefficient η is taken as 1 - 2; the material line fluctuation adjustment coefficient β is taken as 5 - 10.

[0011] A further improvement of the above solution is that: a manhole is provided on the closed cover plate.

[0012] The environmentally friendly and airtight device for the coal bunker distribution trolley provided by the present invention realizes full enclosure during the circular distribution of the distribution trolley, and maximally avoids the overflow of pulverized coal; the fully airtight belt conveyor system reduces the secondary dust generation caused by the belt conveyor's dust return and material carrying, and ensures the airtightness during the transportation of pulverized coal; under the condition of full enclosure of the entire coal bunker distribution trolley, the bag dust removal system adopts reasonable control to effectively handle the dust generated during distribution; dynamically set the start-stop and high-low speed times of the dust collector to improve the efficiency of the dust removal system; control the negative pressure inside the dust removal and airtight system according to the coal bunker distribution volume and the fluctuation of the material line. Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of the distribution trolley in the prior art.

[0014] Figure 2 It is a schematic structural diagram of a preferred embodiment of the present invention.

[0015] Figure 3 is Figure 2 The top view structural diagram of; Figure 4 It is a schematic structural diagram of the sealed belt conveyor; Figure 5 It is a schematic structural diagram of the bag dust removal system. Embodiment

[0016] Embodiment: The environmentally friendly and airtight device for the coal bunker distribution trolley in this embodiment includes: an annular sealing assembly, a sealed belt conveyor, and a bag dust removal system.

[0017] As Figure 2 and Figure 3 shown, the annular sealing assembly includes a closed cover plate 7, a frame, a traveling wheel 1, and a track; the frame bears the closed cover plate 7; the closed cover plate 7 and the frame are located at the upper opening of the coal bunker and form a sealed space at the upper opening of the coal bunker; the traveling wheel 1 is installed at the bottom of the frame 2 and placed on the track so that it can move along the track. There are annular sealing plates 2 on the side of the traveling wheel at the bottom of the frame and on both sides of the discharge port of the sealed belt conveyor; the upper half of the annular sealing plate is made of stainless steel and is connected to the frame, and the lower half is made of rubber and is connected to the upper half by bolts.

[0018] The sealed belt conveyor is located on the closed cover plate 7; both ends of the sealed belt conveyor are discharge ports; the discharge ports pass through the closed cover plate 7; the sealed belt conveyor can rotate around the center of the upper opening of the coal bunker, and as the sealed belt conveyor rotates, the discharge ports at both ends move along circular trajectories with different radii; the top inlet of the sealed belt conveyor is connected to the upstream coal distribution system belt conveyor; the size of the closed cover plate 7 is slightly larger than the size of the outer discharge port for better coverage. Correspondingly, the closed cover plate 7 is circular, and 4 symmetrically arranged traveling wheels are provided for balance.

[0019] As shown Figure 5 in the figure, the bag dust removal system includes a fan 6 and a bag filter 5; the bag dust removal system has 5 dust suction ports, among which 4 dust suction ports 3 are arranged at the four corners of the upper opening of the coal tower, and another dust suction port 11 is connected to the feeding port of the sealed belt conveyor; the corresponding components are connected by a pipeline 4, and a chimney is installed at the exhaust place. The bottom of the bag filter 5 is provided with a dust discharging valve, and the pulverized coal collected by the dust collector directly falls into the large bin of the coal tower through the dust discharging system at the lower part of the dust collector. The fan 6 provides the power for dust removal and sends the gas sucked from the dust suction port to the bag filter 5.

[0020] As shown Figure 4 in the figure, the sealed belt conveyor includes a belt head and tail wheel seal cover and an upper fully enclosed material guiding trough 9, detachable baffles 8 on both sides of the belt conveyor, and a belt return dust receiving plate 10; the belt head and tail wheel seal cover is a fully enclosed structure, forming a sealed space at the head and tail of the belt conveyor, and cleaning devices are respectively arranged at the head pulley and tail pulley parts of the belt conveyor, and the materials cleaned by the cleaning devices fall into the coal tower; the belt head and tail wheel seal cover and the upper fully enclosed material guiding trough form a sealed space with the detachable baffles on both sides of the belt conveyor and the belt return dust receiving plate, avoiding the overflow of coal dust generated during the belt transportation of pulverized coal. The detachable baffle also has the function of being convenient to disassemble, facilitating the operators and maintenance personnel to check the operation of the belt rollers and the belt at any time. The upper surface of the belt return dust receiving plate is a flat plate without rib plates, which is convenient for regularly cleaning the floating dust.

[0021] The bag dust removal system is linked with the feeding system. When the feeder starts to work, the fan 6 of the bag dust removal system starts and maintains the lowest speed. There is no pulverized coal on the belt, so the fan 6 maintains the lowest speed and is ready for operation. Furthermore, a negative pressure P L can be generated at this time, which can be used to handle the scattered materials in the device. When the materials reach the feeding trolley, the fan 6 increases its speed and starts to work.

[0022] In the case of fluctuations in the feeding quantity, assuming that the negative pressure generated by the fan 6 is P, the formula among P, the material flow rate M and the unit time fluctuation value Δh of the material level is P = P L *(1 + η * M / M H + β * Δh / H H ), where P L is the negative pressure generated when the fan 6 runs at the lowest speed; M H is the maximum value of the material flow rate, H H is the highest material level of the coal tower, η is the negative pressure adjustment coefficient, with a value of 1 - 2, and β is the material line fluctuation adjustment coefficient, with a value of 5 - 10. The speed of the dust removal fan is dynamically adjusted through the material flow rate and the fluctuation value of the coal tower material level to maintain an efficient negative pressure dust removal environment inside the entire sealed system, ensuring both the safety of dust removal operation and the dust removal effect, and saving energy at the same time. The negative pressure range generated by the fan is 0.1 to 0.5 kPa.

[0023] The coal dust generated by the cloth is, under the action of negative pressure, passed through 4 dust suction ports and pipelines provided at the top of the coal tower and then enters the bag filter for filtration, and then is discharged into the atmosphere through the fan and chimney; the dust in the closed space of the belt conveyor body enters the dust removal system for treatment under the negative pressure of the dust suction port above the belt conveyor; the pulverized coal collected by the dust collector directly falls into the large bin of the coal tower through the ash conveying system at the lower part of the dust collector. The dust collector uses the methods of negative pressure dust suction by the fan and bag filtration to separate the coal dust from the air, avoiding the deficiencies of the spray dust suppression technology such as increasing the humidity of the pulverized coal, generating positive pressure inside the coal tower by the spray, and being unable to eliminate the impact positive pressure generated by the blanking of the ring feeder.

[0024] The bag dust removal control system is controlled by PLC, mainly controlling the remote start / stop and interlock functions of the dust removal fan, realizing the interlock synchronous start / stop of the dust removal fan and the cloth trolley, reducing the system energy consumption; controlling the backwashing system of the dust collector, the backwashing system of the dust collector keeps backwashing when the cloth trolley is not working, avoiding the coal dust backwashed being sucked away by the dust removal system again, and at the same time improving the backwashing efficiency; controlling the operation of the ash discharging system of the dust collector, a dust discharging valve is provided at the lower part of the dust collector to avoid reverse air suction at the dust discharging port, so as to achieve the maximum efficiency of the dust removal system.

[0025] The closed cover 7 is provided with a manhole; the internal situation can be checked when necessary.

[0026] The present invention is not limited to the above embodiments. All technical solutions formed by equivalent substitution fall within the protection scope required by the present invention.

Claims

1. An environmentally friendly and airtight device for the coal tower batching trolley, characterized in that Comprising: A ring seal assembly, a sealed belt conveyor, and a bag dust removal system; The ring seal assembly includes a closed cover plate, a frame, a ring baffle, traveling wheels, and a track; the frame bears the closed cover plate; the closed cover plate and the frame are located at the upper opening of the coal tower and form a sealed space at the upper opening of the coal tower; the traveling wheels are installed at the bottom of the frame and can move along the track, and the track is annular; The sealed belt conveyor is located on the closed cover plate; both ends of the sealed belt conveyor are discharge ports; the discharge ports penetrate through the closed cover plate; the sealed belt conveyor can rotate around the center of the upper opening of the coal tower, and as the sealed belt conveyor rotates, the discharge ports at both ends thereof move along annular trajectories with different radii; the inlet of the sealed belt conveyor is connected to the upstream feeding equipment; The bag dust removal system includes a fan and a bag dust collector; the bag dust removal system has a plurality of dust suction ports, which are respectively arranged at the four corners of the upper opening of the coal tower and the inlet of the sealed belt conveyor; the fan provides dust removal power and sends the gas sucked from the dust suction ports to the bag dust collector; When starting to feed the material, the fan of the bag dust removal system starts and maintains the lowest speed, and when the material reaches the feeding trolley, the fan increases the speed; In the case of fluctuations in the amount of fabric, assuming the negative pressure generated by the fan is P, the formula among P, the material flow rate M, and the fluctuation value Δh of the material level per unit time is P = P L *1 + η * M / M H + β * Δh / H H , where, P L is the negative pressure generated at the lowest rotational speed of the fan; M H is the maximum value of the material flow rate, H H is the highest material level of the coal tower, η is the negative pressure adjustment coefficient, and β is the material line fluctuation adjustment coefficient.

2. The environmentally friendly and airtight device for the coal tower batching trolley according to claim 1, characterized in that: Annular seal plates are provided on the sides of the traveling wheels at the bottom of the frame and on both sides of the discharge ports of the sealed belt conveyor; the upper half of the annular seal plate is made of stainless steel and is connected to the frame, and the upper half is made of rubber and is connected to the upper half through bolts.

3. The environmentally friendly and airtight device for the coal tower batching trolley according to claim 1, characterized in that: The sealed belt conveyor includes a belt head and tail wheel seal cover and an upper fully enclosed material guiding trough, detachable baffles on both sides of the belt conveyor, and a dust return receiving plate of the belt conveyor; the belt head and tail wheel seal cover is a fully enclosed structure, forming a sealed space at the head and tail of the belt conveyor, and cleaning devices are respectively arranged at the head pulley and the tail pulley of the belt conveyor, and the materials cleaned by the cleaning devices fall into the coal tower; the belt head and tail wheel seal cover and the upper fully enclosed material guiding trough form a sealed space with the detachable baffles on both sides of the belt conveyor and the dust return receiving plate of the belt conveyor.

4. The environmentally friendly and airtight device for the coal tower batching trolley according to claim 1, characterized in that: The negative pressure adjustment coefficient η is taken as 1 - 2; the material line fluctuation adjustment coefficient β is taken as 5 - 10.

5. The environmentally friendly and airtight device for the coal tower batching trolley according to claim 1, characterized in that: The closed cover plate is provided with a manhole.

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