CN102698528A - Dust remover of coal-fired boiler - Google Patents

Abstract

The invention provides a dust remover of a coal-fired boiler. The existing dust removers of coal-fired boilers have the disadvantages of small dust removing strength, large occupied area, complicated structure, high manufacturing cost and relatively low filtration air speed. The dust remover provided by the invention comprises a dust-gas chamber (2) arranged on a steel rack (1); one end of the dust-gas chamber is connected with an intake smoke box (3) while the other end of the dust-gas chamber is connected with an exhaust smoke box (4); the upper part of the dust-gas chamber is connected with an air purifying chamber (5), while the lower part of the dust-gas chamber is connected with a flue-dust retainer (6); a filter head plate (7) is connected on a housing of the dust-gas chamber; the filter head plate (7) is connected with a filter bag device (8); an inlet smoke flue (9) and an outlet smoke flue (10) of the intake smoke box are respectively connected with a bypass smoke flue (11); the air purifying chamber is connected with a spraying and blowing system (12) which is connected with an air supply system (13); and the inlet smoke flue is connected with a spraying cooling device (14) and a dust pre-coating device (15). The dust remover provided by the invention is used as the supporting facilities of coal-fired boilers.

Description

Coal-fired boiler dust collector

technical field

The present invention relates to a boiler supporting facility, in particular to a dust collector for a coal-fired boiler.

Background technique

At present, the bag dust collectors used in the dust control of coal-fired boilers at home and abroad mainly include mechanical vibration dust removal bag dust collectors, room-by-chamber back-flush bag dust collectors, and vibration back-blowing bag dust collectors. dust collector. The mechanical vibration dust cleaning bag filter uses a mechanical device to vibrate or shake the frame of the suspended filter bag to make the filter bag vibrate and remove the accumulated dust. This is one of the oldest and simplest ways that was once widely used in industry. The vibration distribution of mechanical rapping is uneven, and the required filtering wind speed is low. The vibration wave propagates from top to bottom, and the dust removal on the upper and lower surfaces of the filter bag is uneven, resulting in excessive dust removal on the upper part and insufficient dust removal on the lower part. Filter bags are often damaged quickly by severe mechanical force. The replacement and maintenance workload of the filter bag is relatively large. However, due to the simplicity and low investment of some mechanical rapping methods, it is still used in some occasions (small). 2. The bag type dust collector of the room-by-chamber back-blowing type and the vibration back-blowing and dust-removing bag type dust collector are also called counter-airflow dust removal. It uses outdoor or circulating air to reverse the dust-laden airflow. The direction passes through the filter bag to make the dust lumps on it fall off. The airflow distribution of back blowing dust removal on the whole filter bag is relatively uniform, but the dust removal intensity is small, the floor area is large, the structure is complex, the cost is high, and the filtration wind speed should not be too high.

The application of pulse bag filter is more common, and its shape is mostly: fixed pipe type and rotary pulse type. The disadvantage of the fixed row pipe type is: one row of pipes has one pulse valve, and a pulse dust collector has at least 40~50 pulse valves, and as many as 200~300 pulse valves. If one of the pulse valves fails, it will affect the dust removal. Effect. The disadvantage of the rotary pulse type is that in a rotary ash cleaning unit, the four-corner space cannot be effectively used. To achieve the filtration area, it is necessary to increase the length of the filter bag or increase the area of a rotary ash cleaning unit. Some practical situations do not allow it.

Contents of the invention

The purpose of the present invention is to provide a coal-fired boiler dust collector for the above existing problems, which can effectively improve the washing of the filter bag by the high-pressure airflow during the dust removal of similar high-pressure pulse dust collectors while ensuring the dust removal intensity, and greatly improve the filter bag. The service life of the bag also improves the cleaning effect.

The above-mentioned purpose is achieved through the following technical solutions:

Coal-fired boiler dust collector, including a dust gas chamber installed on a steel bracket, one end of the dust gas chamber is connected to the intake smoke box, and the other end is connected to the gas outlet smoke box, the upper part of the dust gas chamber is connected to the clean air chamber, and the lower The ash collecting hopper is connected, the dust chamber housing is connected with a flower plate, the flower plate is connected with the filter bag device, the inlet flue and the outlet flue of the intake smoke box are respectively connected with the bypass flue, The clean air chamber is connected to an injection system, the injection system is connected to an air supply system, and the inlet flue is connected to a spray cooling device and a dust pre-coating device.

The coal-fired boiler dust collector, the gas supply system includes a pressure tank, the pressure tank is connected to an air compressor, the air compressor is connected to an air dryer, and the air dryer is connected to an air supply pipeline .

In the coal-fired boiler dust collector, there are flue gas deflectors in the inlet flue and the intake smoke box respectively.

The coal-fired boiler dust collector, the radial-flow long-bag low-pressure pulse bag dust collector, the spray cooling device includes a water pump, and the water pump is connected to the nozzle through a water pipe.

Beneficial effect:

1. The front part of the smoke inlet filter bag of the present invention is also provided with a smoke deflector and a dust pre-separation device. It can make the flue gas flow evenly, avoid flue gas scour and burn the filter bag; the lifting cold air valve can be opened automatically when the boiler is stopped, and the flue gas stagnant inside the bag filter can be discharged, so that the bag filter does not stop when the bag filter is shut down. Condensation will occur. When the flue gas is discharged directly every time the boiler is ignited, the oil-fired furnace or the oil-coal mixture is fired, the dust pre-coating device can be turned on, and the dust is first adsorbed on the outer surface of the filter bag to form a dust film under the action of the boiler induced draft fan. When the dust collector is put into operation again, there will be no phenomenon of oil sticking to the bag; a spray cooling device is installed at the flue gas inlet of the bag dust collector. 30﹪C°. It can protect the filter material from high temperature damage.

2. The present invention can use a plurality of dedusters in combination, and is suitable for treating flue gas of coal-fired boilers of various large, medium and small generating sets.

Description of drawings

Fig. 1, the schematic diagram of the front view structure of the present invention.

Fig. 2, the top view of the present invention.

Fig. 3, the left side view of the present invention.

Detailed ways

The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

Example 1:

As shown in accompanying drawing 1: the coal-fired boiler dust collector of the present invention comprises the dust gas chamber 2 installed on the steel bracket 1, and one end of the dust gas chamber is connected to the intake smoke box 3, and the other end is connected to the gas outlet smoke box 4 , the dust chamber is connected to the clean air chamber 5 above, and the dust collection bucket 6 is connected to the bottom, the flower plate 7 is connected to the shell of the dust chamber, the flower plate is connected to the filter bag device 8, and the inlet The inlet flue 9 and the outlet flue 10 of the gas smoke box are respectively connected to the bypass flue 11, the clean air chamber is connected to the injection system 12, the injection system is connected to the air supply system 13, and the inlet flue The road connects the spray cooling device 14 and the dust pre-coating device 15.

Example 2:

The coal-fired boiler dust collector, the gas supply system includes a pressure tank 13-1, the pressure tank is connected to an air compressor 13-2, and the air compressor is connected to an air dryer 13-3, the The air dryer described above is connected to the air supply pipeline 13-4.

Example 3:

The coal-fired boiler dust collector has flue gas deflectors 16 in the inlet flue and the intake smoke box respectively.

Example 4:

The coal-fired boiler dust collector, the radial-flow long-bag low-pressure pulse bag dust collector, the spray cooling device includes a water pump 14-1, and the water pump is connected to the nozzle 14-3 through a water pipe 14-2 .

Claims (4)

1. a coal-burning boiler deduster comprises the dirt air chamber that is installed on the steel bracket, it is characterized in that: described dirt air chamber one end connects the air inlet smoke box; The other end connects the smoke box of giving vent to anger, and connects air-purifying chamber above the described dirt air chamber, connects flue-dust retainer below; Connect card on the described dirt gas chamber shell; Described card connects the filter bag device, and the inlet flue duct of described air inlet smoke box is connected the bypass flue respectively with exhaust pass, and described air-purifying chamber connects injection system; Described injection system connects air supply system, and described inlet flue duct connects spraying cooling device and dust precoating device.

2. coal-burning boiler deduster according to claim 1 is characterized in that: described air supply system comprises pressurized tank, and described pressurized tank connects air compressor, and described air compressor connects dried-air drier, and described dried-air drier connects steam line.

3. coal-burning boiler deduster according to claim 1 and 2 is characterized in that: have smoke deflector respectively in described inlet flue duct and the described air inlet smoke box.

4. coal-burning boiler deduster according to claim 1 and 2 is characterized in that: described radial-flow type long bag and low pulse sack cleaner, and described spraying cooling device comprises water pump, described water pump connects shower nozzle through water pipe.

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