CN201437476U - Pebble Coal Unloading Negative Pressure Pneumatic Conveying System - Google Patents

Abstract

A pebble coal unloading negative pressure pneumatic conveying system, the outlet of the pebble coal feeding device under the pebble coal hopper of at least one coal mill is connected to the main engine of the vacuum equipment through the main engine pipe network; The coal is centrally collected into the pebble coal hopper, and the pebble coal is dropped into the pebble coal feeding device at the bottom of the coal hopper by controlling the valves at the top and bottom of the pebble coal hopper; the pebble coal feeding device evenly sends the pebble coal into the In the pipe network connected to the main machine of the vacuum equipment; the negative pressure generated by the main machine of the vacuum equipment will suck the pebble coal sent into the pipe network into the cut-off bin of the vacuum main machine equipment. The main engine of the vacuum equipment can be connected in parallel with the pebble coal feeding device of multiple coal mills through the main engine pipe network to form a negative pressure pneumatic conveying system for unloading. The negative pressure pneumatic conveying system for pebble coal unloading of the utility model uses the host machine of vacuum equipment as the driving force for conveying pebble coal, so the structure is simple, the one-time investment is small, and the repair and maintenance costs are low.

Description

Pebble Coal Unloading Negative Pressure Pneumatic Conveying System

technical field

The utility model relates to a material conveying system, in particular to a negative pressure pneumatic conveying system for pebble coal unloading.

Background technique

When the medium-speed coal mill is working, it will produce pebble coal, which needs to be transported from the coal grinding workshop to outdoor storage. The existing mechanical conveying pebble coal system is to transport the pebble coal in the pebble coal hopper to the storage warehouse for temporary storage through the primary and secondary mechanical conveying equipment (generally buried scraper conveying and mechanical vibration conveying), and then dumped by the dump truck. Transported to the ashes. The advantage is that the degree of automation is high and the labor intensity is reduced. The disadvantage is that it takes up a lot of space (requires trenches), complex structure, large one-time investment, and difficult maintenance and maintenance.

Utility model content

In order to solve the above problems, the utility model provides a negative pressure pneumatic conveying system for pebble coal unloading with simple structure, low one-time investment, and low repair and maintenance costs.

The negative pressure pneumatic conveying system for pebble coal unloading of the utility model, wherein: the outlet of at least one pebble coal feeding device is connected to the main machine of the vacuum equipment through the main pipe network;

The pebble coal feeding device includes the following structure: the pebble coal inlet valve is connected to the entrance above the pebble coal hopper; The outlet of the feeder is connected to the upper inlet of the outlet tee, the lower right outlet of the outlet tee is connected to the air supplement opening to the right, and the lower left outlet is connected to the main pipe network through the outlet valve of the feeder; The anti-jamming plate is round, with a semicircular through hole on the right side; there is a horizontally arranged grate at the bottom of the gravel coal hopper, and a full level gauge is installed on the top of the gravel coal hopper.

The negative pressure pneumatic conveying system for pebble coal unloading of the utility model, wherein: the main engine of the vacuum equipment includes a cyclone separator, a cut-off hopper, a filter hopper, a vacuum pump, and the outlet at the lower end of the cyclone separator is connected to the cut-off hopper below it, and the cyclone separator The outlet at the left end of the filter hopper is connected to the inlet of the filter hopper, and the outlet of the filter hopper is connected to the vacuum pump; the filter hopper is equipped with a bag filter and a pulse blowback device; Filter hopper discharge valve;

The negative pressure pneumatic conveying system for pebble coal unloading of the utility model, wherein: the grate is in the shape of a grid, and the grid is a square with a side length of 80 cm.

The negative pressure pneumatic conveying system for pebble coal unloading of the utility model, wherein: the power used by the screw conveying feeder is a frequency conversion motor.

The negative pressure pneumatic conveying system for pebble coal unloading of the utility model, wherein: the unloading valve of the cutting hopper, the unloading valve of the filter hopper, and the pulse blowback device are connected to the operation control box.

The utility model discloses a pebble coal unloading negative pressure pneumatic conveying system, wherein: the pebble coal inlet valve, the feeder inlet valve, the feeder outlet valve, and the screw conveying feeder are connected to the automatic control device.

The negative pressure pneumatic conveying system for pebble coal unloading of the utility model, wherein: the discharge valve of the cut-off hopper, the unloading valve of the filter hopper, the entrance valve of pebble coal, the entrance valve of the feeder, and the outlet valve of the feeder are pneumatic plug-in valves .

The negative pressure pneumatic conveying system for pebble coal unloading of the utility model uses the host machine of vacuum equipment as the driving force for conveying pebble coal, so the structure is simple, the one-time investment is small, and the repair and maintenance costs are low.

Description of drawings

Fig. 1 is the front view of the utility model pebble coal unloading negative pressure pneumatic conveying system;

Fig. 1b is a layout diagram of the host pipe network 2 of the negative pressure pneumatic conveying system for gravel coal unloading of the utility model;

Fig. 2 is the front view of pebble coal feeding device 3 among Fig. 1;

Fig. 3 is the right view of Fig. 2;

FIG. 4 is a top view of the anti-seize plate 16 in FIG. 2 .

Detailed ways

The negative pressure pneumatic conveying system for pebble coal unloading of the utility model is to transport the pebble coal produced in one or more coal mills to the intercepting hopper and filter hopper through the feeding device-negative pressure system pipe network-vacuum equipment host to realize The closed transportation of the pebble coal pipeline meets the requirements of no dust, clean and environmental protection on site in the boiler room of the power plant.

The negative pressure pneumatic conveying system for pebble coal unloading of the utility model will be further described below in conjunction with the accompanying drawings of the description.

Referring to Fig. 1 and Fig. 1b, the utility model pebble coal unloading negative pressure pneumatic conveying system, the outlet of the pebble coal feeding device 3 under the pebble coal hopper of the 3 coal mills is connected in parallel to the vacuum equipment through the main pipe network 2 Host 1. The vacuum equipment host 1 is an existing technology, and its function is to absorb solid particles or powders with negative pressure generated by a vacuum pump. Chinese patents ZL200620167466.1 and ZL 200520005273.1 have disclosed two specific forms.

Referring to Figures 2-3, the pebble coal feeding device 3 includes the following structure: the pebble coal inlet valve 14 is connected to the entrance above the pebble coal hopper 15, the top of the pebble coal hopper 15 is provided with a full level meter 22, and the pebble coal hopper below 15 The outlet of the feeder is connected to the anti-jamming plate 16, the inlet valve 17 of the feeder, and the inlet of the screw conveyor feeder 18 in turn. The outlet on the right side is connected to the supplementary air outlet 20 that opens to the right side. After the vacuum equipment host 1 is turned on, the supplementary air outlet 20 can ensure sufficient air flow through the pipeline, so that the pebble coal in the pipeline is smoothly sucked into the intercepting hopper 10 of the vacuum equipment host 1 . The outlet on the left side of the lower end of the outlet tee 19 is connected to the main pipe network 2 through the outlet valve 21 of the feeder.

The bottom of the gravel coal hopper 15 is provided with a horizontally arranged grate 23, the grate 23 is grid-like, and the grid is a square with a side length of 80 cm, which can prevent the pebble coal with a particle size greater than 80 mm from passing through the grate 23, so that the pebbles Coal is sucked in the intercepting hopper 10 smoothly. Referring to Fig. 4, the anti-seize plate 16 is circular, and a semicircular through hole is provided on its right side. During the process that the pebble coal continuously enters the screw feeder 18, the anti-seize plate 16 can prevent the pebble coal from being stuck and is running The screw rod inside the screw conveyor feeder 18, so that the screw conveyor feeder 18 feeds smoothly. For pebble coal (with a particle size of less than 80mm) under static and flowing conditions, the internal valve plate of the inlet valve 17 of the feeder needs to be closed/opened freely, in place, and with good airtightness.

The power used by the screw conveyor feeder 18 is a variable frequency motor, and the motor speed can be adjusted with a frequency converter, and the motor speed and current can be displayed in the frequency converter; the frequency converter has the function of adjusting the forward and reverse rotation of the motor. The pebble coal is fed from the inlet of the screw conveyor 18. Under the action of the screw rod, it passes through the drum at a uniform speed, and falls into the outlet tee 19 from the outlet of the screw conveyor feeder 18. Under the effect of pressure, be sucked in the hopper 10 smoothly.

Cutting hopper discharge valve 13, filter hopper discharge valve 12, pebble coal inlet valve 14, feeder inlet valve 17, feeder outlet valve 21 are pneumatic flapper valves. The hopper discharge valve 13, the filter hopper discharge valve 12, and the pulse blowback device 8 are connected to the operation control box 11 for centralized control.

The pebble coal inlet valve 14, the feeder inlet valve 17, the feeder outlet valve 21, and the screw conveyor feeder 18 are connected to the automatic control device. Due to the host pipe network 2, more than one pebble coal feeder 3 outlets The ends are connected in parallel, and the individual transportation of the pebble coal produced by each coal mill can be realized by operating the automatic control device. The automatic control device can control the "open/close" state of each valve in the pebble coal feeding device 3 of each coal mill and the "start/stop" of the screw conveyor feeder 18; The correct action sequence of the valves in the device 3 and the vacuum equipment host 1 and the screw conveyor feeder 18 prevents misoperation due to human factors, so that the vacuum equipment host 1 and the pebble coal feeding device 3 can operate normally, and there will be no accidents due to human factors. The cause of the misoperation of the equipment causes the failure of the equipment operation; the automatic interlocking function of the pebble coal feeding device 3 of more than two coal mills is realized, so as to realize the independent discharge of each coal mill, and there will be no two or more than two coal mills The simultaneous operation of the coal mill feeding device makes the pebble coal unloading negative pressure pneumatic conveying system more reliable and durable.

In order to adapt to the transportation of pebble coal, the specific design of the vacuum equipment host 1 in the utility model can be referred to Fig. 1, and described vacuum equipment host 1 comprises cyclone separator 6, cut-off hopper 10, filter hopper 9, vacuum pump 5, cyclone separator The lower end outlet of 6 is connected to the cut-off hopper 10 below it, the left end outlet of cyclone separator 6 is connected to the inlet of filter hopper 9, and the outlet of filter hopper 9 is connected to vacuum pump 5, and vacuum pump 5 is driven by motor 4; There is a bag filter 7 and a pulse blowback device 8 for automatically cleaning the bag filter. The design of the filter hopper 9 is the same as the technology disclosed in Chinese patent ZL200620167466.1; the bottom of the cut hopper 10 is provided with a cut hopper discharge valve 13. A filter hopper discharge valve 12 is provided at the bottom of the filter hopper 9 .

The working process of the utility model pebble coal unloading negative pressure pneumatic conveying system is:

Delivery started:

1. 22 alarms for the full level meter of the gravel coal hopper.

2. Open the outlet valve 21 of the feeder.

3. By operating the vacuum pump running knob in the control box 11, turn on the vacuum equipment host 1, and make sure that the various valve states in the vacuum equipment host 1 and the pebble coal feeding device 3 are in the correct position (the hopper discharge valve 13 is closed , filter hopper discharge valve 12 is closed, stone coal inlet valve 14 is opened, feeder inlet valve 17 is closed, feeder outlet valve 21 is open), now the whole system is in working order.

4. Turn on the screw conveying feeder 18, and the feeder is in the no-load running state.

5. Close the pebble coal inlet valve 14 above the pebble coal hopper 15.

6. Open the inlet valve 17 of the feeder, and the transportation of pebbles and coal begins.

Through the above steps 1-6, the pebble coal inhaled by the main pipe network 2 from the outlet of the pebble coal feeding device 3 enters the cyclone separator 6, the pebble coal falls into the intercepting hopper 10, and the gas with dust passes through the cloth bag in the filter hopper 9 After dust collector 7 is filtered, clean air that meets environmental requirements is discharged into the atmosphere through vacuum pump 5 driven by motor 4, and more than 90% of the pebble coal particles fall into the intercepting hopper 10, and the intercepting hopper 10 has a cooling effect (the material passes through The cooling of intercepting hopper 10, temperature drops below 200 degrees, guarantees that filter bag and vacuum pump 5 are not damaged), and remaining extremely fine dust falls in filter hopper 9. The starting of the motor 4 and the cleaning of the bag filter 7 are realized by operating the control box 11 and the pulse blowback device 8; The valve 13 and the "on/off" knob of the filter hopper discharge valve 12 realize centralized discharge.

Transfer ends:

7. Close feeder inlet valve 17.

8. Open the pebble coal inlet valve 14.

9. Close the screw conveyor feeder 18.

10. Turn off the host 1 of the vacuum equipment.

11. Close feeder outlet valve 21.

Through the above steps 1-11, the pebble coal conveying procedure of the single coal mill ends. If the pebble coal of the second or third or even more pulverizers is conveyed continuously, there is no need to close the vacuum equipment host 1, only need to open the second pebble coal before conveying the pebble coal of the second coal mill The feeder outlet valve 21 in the feeding device 3 closes the feeder outlet valve 21 in the first coal mill pebble coal feeding device 3. Other steps can be repeated.

The above embodiments only describe preferred implementations of the present utility model, and are not intended to limit the scope of the present utility model. All variations and improvements should fall within the protection scope determined by the claims of the present utility model.

Claims (7)

1. A negative pressure pneumatic conveying system for pebble coal unloading, characterized in that: the outlet of at least one pebble coal feeding device (3) is connected to the vacuum equipment main engine (1) through the main engine pipe network (2); The pebble coal feeding device (3) includes the following structure: the pebble coal inlet valve (14) is connected to the entrance above the pebble coal hopper (15), and the outlet below the pebble coal hopper (15) is sequentially connected to the anti-jamming dead plate (16), feeding The feeder inlet valve (17), the inlet of the screw conveyor feeder (18), the outlet of the screw conveyor feeder (18) is connected to the upper inlet of the outlet tee (19), and the outlet tee (19) The outlet on the right side of the lower end is connected to the supplementary air outlet (20) that opens to the right, and the outlet on the left side of the lower end is connected to the main pipe network (2) through the outlet valve (21) of the feeder; the anti-seize plate (16) is circular, and its The right side is provided with a semicircular through hole; the bottom of the gravel coal hopper (15) is provided with a horizontally arranged grate (23), and the top of the gravel coal hopper (15) is provided with a full level meter (22). 2. The negative pressure pneumatic conveying system for pebble coal unloading according to claim 1, characterized in that: the vacuum equipment host (1) includes a cyclone separator (6), a cut-off hopper (10), and a filter hopper (9) , vacuum pump (5), the lower end outlet of cyclone separator (6) is connected to the cut-off hopper (10) below it, and the left end outlet of cyclone separator (6) is connected to the inlet of filter hopper (9), and filter hopper (9) The outlet of the outlet is connected to the vacuum pump (5); the filter hopper (9) is provided with a bag filter (7) and a pulse blowback device (8); the bottom of the hopper (10) is provided with a hopper discharge valve (13), The bottom of the filter hopper (9) is provided with a filter hopper discharge valve (12); 3. The negative pressure pneumatic conveying system for pebble coal unloading according to claim 2, characterized in that: the grate (23) is in the form of a grid, and the grid is a square with a side length of 80 cm. 4. The negative pressure pneumatic conveying system for pebble coal unloading according to claim 3, characterized in that: the power used by the screw conveying feeder (18) is a frequency conversion motor. 5. The negative pressure pneumatic conveying system for pebble coal unloading according to claim 4, characterized in that: the intercepting hopper unloading valve (13), the filter hopper unloading valve (12), and the pulse blowback device (8) are connected to Operate the control box (11). 6. The negative pressure pneumatic conveying system for pebble coal unloading according to claim 5, characterized in that: pebble coal inlet valve (14), feeder inlet valve (17), feeder outlet valve (21), screw The conveying feeder (18) is connected to the automatic control device. 7. The negative pressure pneumatic conveying system for pebble coal unloading according to claim 6, characterized in that: the cut-off hopper discharge valve (13), the filter hopper discharge valve (12), the pebble coal inlet valve (14) , The inlet valve (17) of the feeder and the outlet valve (21) of the feeder are pneumatic plug-in valves.

Images