CN201603602U - A high-efficiency and environment-friendly pebble coal negative pressure pneumatic conveying system - Google Patents

Abstract

The utility model relates to equipment for transporting pebble coal in a thermal power plant, in particular to an efficient and environment-friendly negative pressure pneumatic conveying system for pebble coal. The system includes a plurality of pebble coal hoppers connected to the coal mill. The pebble coal hoppers are connected to their respective branch pipelines through the feeding device. Each branch pipeline leads to the pebble coal bunker through the main pipeline. Unloading device, the air outlet on the upper part of the gravel coal bunker is connected to the volume fan through the dust collector; the branch pipeline and the main pipeline include several sections of horizontal pipelines and ascending pipelines, and loose air vents communicating with the outside atmosphere are arranged on the ascending pipelines. The air duct is provided with a purge air port communicated with the outside atmosphere on the horizontal duct. The utility model has stable operation, is not easy to be blocked, has little dust pollution, low noise and strong conveying capacity

Description

A high-efficiency and environment-friendly pebble coal negative pressure pneumatic conveying system

technical field

The utility model relates to equipment for transporting pebble coal in a thermal power plant, in particular to an efficient and environment-friendly negative pressure pneumatic conveying system for pebble coal.

Background technique

Medium-speed coal mills are widely used in thermal power plants due to their low investment and good economy. The medium-speed coal mill will produce pebble coal during operation. The pebble coal mainly comes from gangue, pyrite, etc., which are dense and difficult to grind in the raw coal, and it is discharged from the pebble coal discharge port at the lower part of the coal mill when it is running. The pebble coal needs to be discharged in time. If the pebble coal is not discharged in time, it will accumulate in a large amount in the coal mill, which will easily cause the scraper and carbon seal to wear or fall off. The accumulated pebble coal will also block the air duct and catch fire under the action of hot air. The coal mill components such as the air duct, scraper and stone coal box were burned, causing the coal mill to fail and stop operating.

Common pebble coal discharges include artificial discharge, hydraulic discharge, and mechanical transportation discharge. At present, due to the variety of coal types in power plants, the quality of raw coal generally deteriorates. The amount of stones, gangue, ore and other sundries in raw coal has increased compared with before, and the discharge of pebble coal has greatly increased, which seriously affects the safe operation of thermal power plants. Conventional pebble coal discharge methods It is difficult to solve the problem that the amount of pebble coal increases greatly at present.

Recently, a small number of power plants in China have adopted pneumatic conveying systems for the treatment of pebble coal. Using moving air as the medium to convey materials is a transportation method that has long been used in industry, and is called pneumatic conveying. The advantages of the pneumatic conveying system are: simple equipment structure, high conveying efficiency, and good labor hygiene conditions. The conveying pipeline for pneumatic conveying is convenient to set up the pipe network according to local conditions, the layout is simple and flexible, it can make full use of the workshop area, and it is easy to adapt to the workshop environment.

However, there are many problems in the pneumatic conveying system that is actually used in the transportation of pebble coal, mainly as follows: 1. Pipeline blockage is prone to occur, and there is no dredging measure after the blockage; 2. There is still dust leakage on site, and there are many system failures; 3. The system The noise is very loud, which becomes the biggest noise source of the power plant, which is not conducive to environmental protection; 4. The conveying capacity of the system is not high; 5. The existing pneumatic conveying system generally uses a screw feeder as a feeding tool for pebble coal, which is difficult for large-size pebble coal Conveying; 6. As a rotating part, the screw feeder is very prone to failure and wear when conveying pebble coal.

Contents of the invention

The technical problem to be solved by the present invention is to provide an efficient and environment-friendly pebble coal negative pressure pneumatic conveying system with stable operation, low dust pollution, low noise and strong conveying capacity.

The high-efficiency and environment-friendly pebble coal negative pressure pneumatic conveying system of the utility model includes a plurality of pebble coal hoppers connected with coal mills, and the pebble coal hoppers are connected with respective branch pipelines through feeding devices, and each branch pipeline passes through the main pipeline It leads into the pebble coal bunker, and the bottom of the pebble coal bunker is equipped with a discharge device, and the air outlet on the upper part of the pebble coal bunker is connected with the volume fan through the dust collector; the branch pipeline and the main pipeline include several sections of horizontal pipes and ascending pipes, A loose air duct communicating with the outside atmosphere is arranged on the ascending pipeline, and a purge air outlet communicating with the outside atmosphere is arranged on the horizontal pipeline.

The upper space of the gravel coal scuttle is directly connected to the branch pipeline through a connecting pipe.

The shell of the gravel bunker is provided with a negative pressure safety valve.

The outside of the volumetric fan is covered with a soundproof cover, and a soundproof room is arranged outside the soundproof cover, the air outlet of the volumetric fan is arranged in the soundproof room, and the top of the soundproof room has a ventilation hole; the ventilation hole is provided with a muffler and a rainproof cap .

The feeding device between the gravel coal hopper and the branch line pipeline includes a housing, the top of the housing is provided with a feed port communicating with the gravel coal hopper, the rear end of the housing is provided with an air inlet, and the front end of the housing is provided with a The discharge port connected by the branch pipeline; a first-level material receiving plate is set in the middle of the shell cavity below the material inlet, and an air inlet adjustment plate is arranged between the first-level material receiving plate and the air inlet, and the air inlet adjustment plate The front end is hingedly connected with the casing, so that the included angle between the air inlet regulating plate and the horizontal air inlet direction can be adjusted and fixed at different angle positions.

The first-stage material receiving plate is inserted into the housing through the slots on both sides of the housing, and the slots are arranged in multiple groups from bottom to top, so that the first-level material receiving plate can be inserted at different height positions .

A secondary material receiving plate is also arranged on the front and lower side of the first level material receiving plate.

The advantages of the present invention are:

1. Since the pebble coal is difficult to climb in the slope pipeline, the climbing ability of the pebble coal can be improved by installing a dredging pipe on the ascending pipeline;

2. After the pebble coal enters the horizontal conveying pipeline, it is easy to deposit. The purge tuyere installed in the horizontal pipeline can be opened to dredge the purge tuyere in case of a deposition accident, ensuring the reliable operation of the equipment;

3. The connecting pipe between the gravel coal hopper and the branch pipeline can ensure that the negative pressure is maintained in the gravel coal hopper, preventing dust from leaking and polluting the environment;

4. The gravel coal bunker is equipped with a negative pressure safety valve, which can prevent accidents caused by excessive negative pressure in the system when the pipeline is blocked;

5. The sound insulation cover, sound insulation room and muffler installed outside the volume fan can effectively reduce noise pollution;

6. In the special conveying device, the pebble coal and air enter the mixing chamber from two passages respectively, which can prevent the pebble coal from falling too fast and cause blockage; the air is divided into two parts by the air inlet regulating plate, and one part passes through the lower part of the inner cavity of the shell for Provide the main conveying power, one part passes through the mixing chamber used to push the pebble coal into the front end from the upper part of the first-stage material receiving plate, and the ratio of the two parts of the air can be changed by adjusting the opening of the air inlet regulating plate, and the ratio of the conveying air to the pebble coal can be adjusted so that Change the system delivery capacity;

7. The special conveying device does not use any rotating parts, and its operation reliability is high and it is not easy to wear.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the utility model;

Fig. 2 is a top view structural schematic diagram of Fig. 1;

Fig. 3 is a schematic diagram of an enlarged structure of the gravel coal scuttle;

Fig. 4 is a schematic structural view of the purge tuyere;

Fig. 5 is an enlarged structural schematic diagram of the feeding device.

Detailed ways

Reference signs include: gravel coal hopper 01, feeding device 02, housing 021, feed port 022, air inlet 023, discharge port 024, first-stage material receiving plate 025, air inlet regulating plate 026, slot 027, two Grading plate 028, branch line pipeline 03, main line pipeline 04, stone coal bunker 05, unloading device 051, negative pressure safety valve 052, dust collector 06, volume fan 07, volume fan outlet 071, loose air duct 08. Purge tuyere 09, soundproof cover 10, soundproof room 11, ventilation hole 111, muffler 112, rainproof cap 113, connecting pipe 12.

As shown in Figures 1 and 2, the system includes multiple pebble coal hoppers 01 connected to coal mills. The pebble coal hoppers are connected to their respective branch pipelines 03 through feeding devices 02. A section of communication pipe 12 is directly connected with branch pipeline 03 . Each branch pipeline leads to the pebble coal bunker 05 through the main line pipeline 04. The bottom of the pebble coal bunker is equipped with a discharge device 051. The air outlet on the upper part of the pebble coal bunker is connected to the volume fan 07 through the dust collector 06. The body is provided with a negative pressure safety valve 052; the branch pipeline 03 and the main pipeline 04 include several sections of horizontal pipelines and ascending pipelines, and a loose air duct 08 communicating with the outside atmosphere is arranged on the rising pipelines (see Figure 3). A purge tuyere 09 communicated with the outside atmosphere is provided on the horizontal pipeline (see FIG. 4 ).

The outside of the volume fan 07 is covered with a sound insulation cover 10, and a sound insulation room 11 is arranged outside the sound insulation cover. The air outlet 071 of the volume fan is arranged in the sound insulation room, and the top of the sound insulation room has a ventilation hole 111; the ventilation hole is provided with a muffler 112 And rain cap 113.

The operation process of the feeding device 02 is: the pebble coal in the pebble coal hopper 01 enters the shell 021 from the feed port 022, falls on the first-stage material receiving plate 025, and the first-stage material receiving plate 025 is inserted into the shell On the slots 027 on both sides, the slots are arranged in arrays according to the distance from the feed inlet. The first-stage material receiving plate 025 can be inserted into different slots 027 to change the pebble coal flow area, so as to realize the pebble coal with different particle sizes. The air enters from the air inlet 023 and is divided into two parts by the air inlet regulating plate 026. One part passes from the lower part of the first-level material receiving plate 025 to the material outlet for pneumatic conveying, and the other part is used on the upper part of the first-level material receiving plate 025. To push the pebble coal to the discharge port; by adjusting the opening of the air inlet adjustment plate 026, the ratio of the two parts of the air can be changed, thereby changing the system’s conveying capacity, and the opening of the air inlet adjustment plate 026 can be increased to increase the lower conveying air volume and reduce The upper part pushes the air volume to reduce the conveying volume, and closing the opening of the air inlet regulating plate 026 can reduce the lower conveying air volume and increase the upper pushing air volume to increase the conveying volume; finally, the pebble coal falls from the first-stage receiving plate 025 to the second-stage receiving plate. The material plate 028 is mixed with the air flow and flows out from the discharge port 024.

Claims (8)

1. high-efficiency environment-friendly type negative-pressure pneumatic transmission system for pebble coal, include a plurality of stone coal bunkers (01) that are connected with coal pulverizer, the stone coal bunker is connected with separately tap line (03) by pay-off (02), each tap line feeds stone coal bunker (05) through main line pipeline (04), stone coal bunker bottom is provided with device for discharging (051), and the air outlet on stone coal bunker top is connected with volume blower fan (07) through deduster (06); It is characterized in that: tap line 03 and main line pipeline 04 include plurality of sections horizontal pipe and increase in pipeline, increase in pipeline is provided with the loose airduct (08) that communicates with outside atmosphere, and horizontal pipe is provided with the purging air port (09) that communicates with outside atmosphere.

2. high-efficiency environment-friendly type negative-pressure pneumatic transmission system for pebble coal according to claim 1 is characterized in that: the upper space of described stone coal bunker (01) is by directly being connected with tap line (03) one period communicating pipe (12).

3. high-efficiency environment-friendly type negative-pressure pneumatic transmission system for pebble coal according to claim 1 is characterized in that: the housing of described stone coal bunker (05) is provided with negative pressure relief valve (052).

4. high-efficiency environment-friendly type negative-pressure pneumatic transmission system for pebble coal according to claim 1, it is characterized in that: described volume blower fan (07) outside is covered with blimp (10), in the blimp outer setting (11) between sound insulation are arranged, in the air outlet of volume blower fan (071) was arranged between sound insulation, the top had air vent (111) between sound insulation.

5. high-efficiency environment-friendly type negative-pressure pneumatic transmission system for pebble coal according to claim 4 is characterized in that: air vent (111) locates to be provided with muffler (112) and rainhat (113).

6. high-efficiency environment-friendly type negative-pressure pneumatic transmission system for pebble coal according to claim 1, it is characterized in that: described pay-off (02) includes a housing (021), the top of housing is provided with the charging aperture (022) that communicates with stone coal bunker (01), the housing rear end is provided with air inlet (023), and the housing front end is provided with the discharging opening (024) that is connected with tap line (03); Housing inner chamber below charging aperture middle part is provided with the one-level plate (025) that connects material, one-level connects material and is provided with an air inlet adjustment plate (026) between plate and the air inlet, air inlet adjustment front edge of board and housing are articulated and connected, and make the adjustable included angle joint between air inlet adjustment plate and the horizontal air intake direction and are fixed on the different angles position.

7. high-efficiency environment-friendly type negative-pressure pneumatic transmission system for pebble coal according to claim 6, it is characterized in that: the described one-level plate (025) that connects material is inserted on the housing by the slot (027) that is positioned at the housing both sides, described slot is provided with many groups from the bottom to top, and the one-level plate that connects material can be inserted on the different height and positions.

8. according to claim 6 or described high-efficiency environment-friendly type negative-pressure pneumatic transmission system for pebble coal, it is characterized in that: described one-level plate (025) front lower place that connects material also is provided with the secondary plate (028) that connects material.

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