CN101804918B - Dual-channel adjustable pebble coal feeding device - Google Patents

Abstract

The invention relates to a material conveying part for a pebble coal pneumatic conveying system in a thermal power plant, in particular to a dual-channel adjustable pebble coal feeding device, which comprises a shell, wherein the top part of the shell is provided with a feeding port which is communicated with a pebble coal hopper, the rear end of the shell is provided with an air inlet, and the front end of the shell is provided with a discharging port which is communicated with a negative-pressure pipeline of a pneumatic conveying system; a primary receiving plate is arranged on the middle part of an inner cavity of the shell below the feeding port, an air inlet adjusting plate is arranged between the primary receiving plate and the air inlet, and the front end of the air inlet adjusting plate is hinged with the shell, so the angle between the air inlet adjusting plate and the horizontal air inlet direction is adjustable and is fixed at different angle positions. The dual-channel adjustable pebble coal feeding device has simple structure, rapid conveying speed, large adaptable pebble coal granularity range, adjustable conveying conditions and high running reliability.

Description

A double-channel adjustable pebble coal feeding device

technical field

The invention relates to a material conveying component used in a pebble coal pneumatic conveying system in a thermal power plant, in particular to a dual-channel adjustable pebble coal feeding device.

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 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, at present, there are many problems in the pneumatic conveying system actually applied to the transportation of pebble coal, mainly as follows:

1. Insufficient conveying capacity. The feeding device of the pebble coal in the pneumatic conveying system mainly adopts the screw feeder, and the feeding speed of the screw feeder is very limited. In the case of a large amount of pebble coal, the pebble coal cannot be transported away in time;

2. Unable to convey large particle size materials. There are many materials with larger particle sizes in the pebble coal, and the screw feeder cannot transport the pebble coal with large particle size, which limits the application range of the pneumatic conveying system;

3. As a rotating part, the screw feeder is very prone to failure and wear when conveying pebble coal. It often needs maintenance and has poor reliability.

Contents of the invention

The technical problem to be solved by the present invention is to provide a dual-channel adjustable pebble coal feeding device with simple structure, fast conveying speed, wide range of suitable pebble coal particle sizes, adjustable conveying conditions and high operational reliability.

The double-channel adjustable pebble coal feeding device of the present invention includes a shell, the top of the shell is provided with a feed port communicating with the pebble coal hopper, the rear end of the shell is provided with an air inlet, and the front end of the shell is provided with an air inlet. The discharge port where the negative pressure pipes of the conveying system are connected; a first-level material receiving plate is arranged in the middle of the shell cavity below the material inlet, and an air inlet regulating plate is arranged between the first-level material receiving plate and the air inlet. The front end of the air regulating plate is hingedly connected with the housing, 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 advantage of the present invention is that the pebble coal and air can enter the mixing chamber respectively from two passages, so as to prevent the pebble coal from falling too fast to form a blockage; The flow area is large, so as to realize the feeding of pebble coal with different particle sizes, which can be adapted to the transportation of large-size pebble coal. The two-stage separation plate can make the pebble coal have an initial velocity and be in the area of the highest air flow velocity, which is conducive to the transportation of pebble coal. The air is divided into two parts by the air inlet adjustment plate, one part passes through the lower part of the inner cavity of the shell to provide the main conveying power, and the other part passes through the upper part of the primary material receiving plate to push the pebble coal into the mixing chamber at the front end, and is adjusted by adjusting the air inlet. The opening of the plate can change the ratio of the two parts of the air, and adjust the ratio of conveying air to pebble coal to change the conveying capacity of the system. The device does not use any rotating parts, has high operating reliability and is not easy to wear.

Description of drawings

Fig. 1 is a schematic structural view of the present invention.

Detailed ways

The reference signs include: shell 1, gravel coal hopper 2, material inlet 3, air inlet 4, material outlet 5, first-level material receiving plate 6, second-level material receiving plate 7, slot 8, air inlet regulating plate 9.

As shown in the figure, the operation process of the feeding device of the present invention is: the pebble coal in the pebble coal hopper 2 enters the housing 1 from the feed port 3, falls on the first-stage material receiving plate 6, and the first-stage material receiving plate 6 is inserted into the slots 8 on both sides of the shell, and the slots are arranged in arrays according to the distance from the feed inlet. The first-stage material receiving plate 6 can be inserted into different slots 8 to change the flow area of pebble coal, so as to realize the For the feeding of pebble coal with different particle sizes, the air enters from the air inlet 4 and is divided into two parts by the air inlet regulating plate 9, one part passes through the lower part of the first-stage material receiving plate 6 to the discharge port for pneumatic conveying, and the other part passes through the first-stage receiving plate The upper part of the material plate 6 is used to push the pebble coal to the discharge port; by adjusting the opening of the air inlet regulating plate 9, the ratio of the two parts of the wind can be changed, thereby changing the conveying capacity of the system, and the opening of the air inlet regulating plate 9 can be increased. Lower conveying air volume, reducing upper pushing air volume to reduce conveying volume, closing the opening of the air inlet regulating plate 9 can reduce lower conveying air volume, increase upper pushing air volume to increase conveying volume; finally, pebble coal is discharged from first-stage material receiving plate 6 It falls on the secondary material receiving plate 7 and mixes with the air flow to flow out from the discharge port 5.

Claims (3)

1. a dual-channel adjustable pebble coal feeding device includes a housing (1), and the top of housing is provided with the inlet point (3) that communicates with the stone coal hopper, and it is characterized in that: the housing rear end is provided with ventilation inlet (4), and the housing front end is provided with discharging opening (5); Housing inner chamber below inlet point middle part is provided with the one-level plate (6) that connects material; One-level connects material and is provided with an air inlet adjustment plate (9) between plate and the ventilation 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.

2. dual-channel adjustable pebble coal feeding device according to claim 1; It is characterized in that: the said one-level plate (6) that connects material is inserted on the housing through the slot (8) that is positioned at the housing both sides; Said slot (8) 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 position.

3. dual-channel adjustable pebble coal feeding device according to claim 1 and 2 is characterized in that: said one-level plate (6) front lower place that connects material also is provided with the secondary plate (7) that connects material.

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