CN2420056Y - Separate room off-line ash cleaning low voltage long bag pulse bag type dust remover - Google Patents

Abstract

The utility model relates to a bag-type dust removal equipment capable of off-line dust cleaning and bag replacement maintenance, which adds manual and pneumatic butterfly valves to the air inlet and outlet of the existing dust collector. After closing the corresponding valve, start the low-pressure rapid pulse injection mechanism to realize off-line dust cleaning or bag replacement maintenance; the top of the dust collector is equipped with a maintenance corridor with a rainproof shed and heat insulation layer, and the broken bag detection device, low-pressure rapid pulse injection The mechanism and pneumatic butterfly valve are concentrated inside to facilitate maintenance; the removed dust is sent to the large ash bin by the pneumatic ash conveying system, and after the dust and gas are separated by the dust collector on the top of the warehouse, the dust is loaded on the truck and transported outside; the ash conveying system is equipped with a mobile and fixed air cannons for declogging.

Description

Chamber off-line dust removal low pressure long bag pulse bag filter

The utility model relates to a dry filter type dust removal equipment.

Most of the existing pulse bag dust collectors are online dust removal operation type, and there is a phenomenon of "dust reattachment" in the process of blowing dust removal, so thorough dust removal cannot be achieved. When the "dust reattachment" is serious, the dust removal will "failure", resulting in a decrease in filtration speed, an abnormal increase in resistance, a shortened life of the filter bag, and strain on the pulse valve diaphragm. Practice has proved that if the dust is blown and cleaned under the condition of stopping the flow of the filtered gas, and the dust is given sufficient settling time, the cleaning of the dust will be more thorough and the cleaning effect of the filter bag will be better.

The invention patent (Patent No. 87101659.1, Certificate No. 4536) obtained by Hu Jianzhong et al. proposes a "chamber-stop air-stop pulse bag filter" which is an offline dust removal operation type, which solves the problem of the online dust removal operation pulse jet bag filter. There are problems of "dust reattachment" and "dust removal failure", but there are still the following deficiencies in the structure: 1. There is no maintenance corridor with rainproof shed and heat insulation layer, which is not suitable for large-scale equipment. 2. Pneumatic butterfly valves with square or circular cross-sections are not used as off-line valves, and manual dust and gas inlet butterfly valves are not used, so it is impossible to realize offline bag replacement and maintenance in separate chambers. 3. No pneumatic ash conveying system is designed.

The purpose of this utility model patent is to design a pulse bag dust collector, which can not only filter dust and carry out offline dust removal, but also facilitate daily maintenance, realize offline bag replacement and maintenance, and solve the problem of dust secondary pollution existing in traditional ash conveying systems . The purpose of this utility model is achieved in this way: Install a manual butterfly valve at the dust gas inlet of the dust collector, install a square or circular cross-section pneumatic butterfly valve at the clean gas outlet, and close the above-mentioned inlet and outlet butterfly valves at the same time, then offline bag replacement and maintenance can be performed ;The top of the dust collector is designed with a maintenance corridor with rainproof and heat insulation functions, which gathers all the operating valves together to facilitate daily maintenance after the equipment is enlarged; "Double valve" ash unloading, pipeline ash transportation, and ash storage in the large ash silo; the top of the large ash silo adopts a separate chamber off-line pulse dust collector to separate dust and gas; A broken bag detection device is added to each clean air channel.

The above scheme not only solves the problems of "dust reattachment" and "failure of dust removal" existing in the online dust removal type dust collector, but also solves the problems of heavy maintenance workload and secondary pollution of dust existing in the mechanical dust conveying system. At the same time, offline bag replacement and maintenance can be realized, which is conducive to the daily maintenance of large-scale equipment.

Below in conjunction with accompanying drawing, the utility model is described in detail.

Attached picture 1. Figure 2 is the side sectional view of the utility model. Pneumatic and manual butterfly valve diagram attached 3. Pneumatic ash conveying system diagram attached 4. Figure 5 of fixed and mobile air cannons. Figure 6 of the broken bag detection device. Mechanism diagram of low-pressure rapid pulse injection

Figure 1 shows a side sectional view of an embodiment of the present invention. The filter unit (or chamber) consists of an upper box 1, a filter chamber 2 and an ash hopper 3. The large-scale dust collector consists of more than 10 chambers arranged in double rows, as shown in Figure 1. The dust-laden gas enters the ash hoppers 3 on both sides from the dust-gas main pipe 10 through the manual butterfly valve 12, and the airflow turns upwards and enters the filter chamber 2; the dust is filtered by the filter bag, and the filtered clean air enters the upper box 1, and passes through the pneumatic butterfly valve. 6 is merged into the clean gas main pipe 8, and then discharged to the atmosphere. When the running resistance of the equipment reaches the set value, the program controller controls the pneumatic butterfly valve 6 to close, and starts the low-pressure rapid pulse injection mechanism 5 to clean the filter bag off-line. The removed dust settles into the ash hopper 3, and is discharged into the pneumatic ash conveying pipeline 16 through the "double valve", and sent to the ash storage bin 19; the dust in the ash storage bin is humidified and stirred by the humidifying mixer 24, and then unloaded into the ash truck for transportation. .

In the utility model, the top plate of the clean gas main pipe and the chambers on both sides are designed as a maintenance corridor 11, in which a low-pressure rapid pulse injection mechanism 5, a pneumatic butterfly valve 6 and a broken bag detection device are arranged in a concentrated manner, and a rainproof shed 4 and a partition are arranged at the same time. Thermal layer 7. If the gas at normal temperature is handled, the insulation material may not be filled in the insulation layer, which is only required for structural reinforcement.

Fig. 2 shows the structure of the pneumatic butterfly valve 6 and the manual butterfly valve 12, the two principles are the same, but the former is driven by a cylinder, and the latter is moved by a handle. When the pneumatic butterfly valve and manual butterfly valve of a room are closed at the same time, the upper cover of the room can be opened to perform off-line bag changing and maintenance operations, while the other rooms carry out filter and dust removal work as usual.

The pneumatic butterfly valve proposed by the utility model has the following advantages over the commonly used pneumatic poppet valves at home and abroad: (1) simple structure, convenient manufacture; (2) accurate in place, convenient observation; (3) normally open structure, good safety, and Pneumatic disc poppet valves will fall down one after another due to insufficient air pressure or failure of the air source, covering the outlet channel of the clean air, causing the main exhaust fan to vibrate or the dust collector shell to be deflated and other unsafe phenomena, which are not uncommon.

Fig. 3 shows the pneumatic ash conveying system of the present invention. The two high-pressure blowers 13 serve as backups for each other. Put the three-way guide valve plate 18 at the position shown in the figure, gradually open the regulating butterfly valve 14 and start the right blower, and the air induction pipe 16 will draw in the flue gas from the main smoke pipe 17, and the air induction pipe 16 will The tube runs around under the dust collector hopper. Under the control of the PLC program, the rotary ash discharge valve 14 and the Ф250 pneumatic butterfly valve 15 of each ash hopper are opened sequentially to discharge the ash into the pipe, and then the ash is input into the large ash bin 19 through the ascending pipe 21 . The dust is stored in the bin, and the humidifying mixer 24 is started at regular intervals, and the ash unloading hose 25 is discharged into the ash truck for transportation inside and outside; the gas passes through the off-line dust-cleaning pulse dust collector 20 installed on the top of the bin, and is guided by the downpipe 2 to the fan 13 , Beat back the dust main pipe 10 through outlet pipe 23 again. In order to prevent fine dust from clogging the ash conveying pipeline and the large ash bin, the mobile air cannon A and the fixed air cannon B are used to clear the two. Compared with the traditional mechanical ash conveying system (screw machine or buried scraper machine and bucket elevator), this pneumatic ash conveying system has the advantages of simple structure, saving investment, no maintenance workload, clean and hygienic, etc.

Figure 4 shows a mobile air cannon A and a stationary air cannon B. It is made up of intake pipe 30, air storage tank 27, high-pressure pulse valve 28, and blowing pipe 29. The mobile air cannon is used for the ash pipeline 16, and the fixed air cannon is used for the large ash bin 19. The air supply pressure of the air source should be higher than 0.4Mpa. When clearing the blockage, manually press the air release button 32 to trigger the pulse valve 28 to blow, and use this method of launching an air cannon to clear the blockage.

Figure 5 shows a broken bag detection device. Design and install the pipe head with ball valve 36 on all clean gas passages of upper casing. When needing leak detection, prepare the glass rod 33 of band rubber stopper 34, and besmear a layer of white vaseline thinly on it, then insert it in the clean air channel. After several hours, take it out for comparison, and the filter bag in the channel corresponding to the glass rod with the most dust may be detected to be leaky.

Figure 6 shows the low-pressure rapid pulse injection mechanism. It is made up of low-pressure fast pulse valve 37 , gas distribution box 38 , ejection pipe 39 and blowing pipe 40 . The pulse valve 37 has the characteristics of low blowing air source pressure, only 0.2-0.3Mpa, and quick switch; the blowing pipe 40 has a tapered nozzle 41, which can make the speed of the blowing air flow reach the speed of sound.

Other technologies required for implementing the utility model patent all adopt known technologies.

Claims (6)

1. A low-pressure long-bag pulse bag dust collector for off-line dust removal in separate chambers, which is composed of a filter unit, a pulse injection device, and an ash conveying system. Butterfly valve adopts low-pressure rapid pulse injection mechanism; the top of the dust collector is equipped with a maintenance corridor with a rainproof shed and heat insulation layer, and there is a broken bag detection device inside; the lower part of the dust collector is equipped with a pneumatic ash conveying system with a pulse dust collector on the top of the warehouse . 2. The dust collector according to claim 1, characterized in that: the air inlet and outlet pipes of the dust collector are equipped with manual and pneumatic butterfly valves with square or circular cross-sections, the material of the valve body is steel plate or cast iron, and it is operated with a cylinder or a handle. 3. The dust remover according to claim 1, characterized in that: the low-pressure rapid pulse injection mechanism is composed of a low-pressure rapid pulse valve, an air distribution box and a spray pipe with a tapered nozzle. 4. The dust collector according to claim 1, characterized in that: the top of the dust collector is provided with a maintenance corridor with a rainproof shed and a heat insulation layer, and the bottom plate of the corridor is a box-shaped beam structure, which can be filled with heat insulating materials to make it have an insulation heat function. 5. The dust remover according to claim 1, characterized in that: each clean air channel of the dust remover in the maintenance corridor is equipped with a broken bag detection device, which is composed of a sampling pipe with a ball valve and a rubber plug with a glass rod. 6. The dust collector according to claim 1, characterized in that: the lower part of the dust collector is a pneumatic ash conveying system, which consists of a high-pressure fan, ash unloading "double valve", a large ash bin, a dust collector on the top of the bin, a humidifying mixer and a mobile It is composed of a fixed air cannon; the dust collector on the top of the warehouse is a compartmental off-line pulse bag filter, the off-line valve is operated by a film cylinder, and the surface of the filter bag is covered with a polytetrafluoroethylene microporous film.

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