CN202555101U - Positioning blowback low-pressure impulsion bag type dust collector - Google Patents
Positioning blowback low-pressure impulsion bag type dust collector Download PDFInfo
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- CN202555101U CN202555101U CN2012201987619U CN201220198761U CN202555101U CN 202555101 U CN202555101 U CN 202555101U CN 2012201987619 U CN2012201987619 U CN 2012201987619U CN 201220198761 U CN201220198761 U CN 201220198761U CN 202555101 U CN202555101 U CN 202555101U
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Abstract
The utility model provides a positioning blowback low-pressure impulsion bag type dust collector. A pattern panel divides a shell into a dust air chamber and a purified air chamber through. A dust collecting hopper is arranged at the bottom of the dust air chamber, and the front side of the dust air chamber is connected with a gas-smoke inlet tank. A gas-smoke outlet tank is connected with the rear side of the purified air chamber. Holes arranged in a matrix mode are disposed on the pattern panel. Each hole is connected with a filter bag opening, and filter bag bodies are located in the dust air chamber. A blowback dust cleaning mechanism is arranged above a filter bag device and a level spurt pipe arranged in the blowback dust cleaning mechanism is controlled by a drive device and a transmission device to do reciprocating motions along the horizontal direction above the pattern plate. Moreover, the level spurt pipe is connected with a gas storage pot and a pulse valve through a high-temperature-resistant soft pipe. The positioning blowback low pressure impulsion bag type dust collector is simple in structure, efficient, low in cost, and capable of treating dusty gas in large air volume. Single-channel dust collectors are connected in parallel to form a multichannel dust collector.
Description
Technical field
The utility model relates to the gas solid separation field, relates to a kind of bag-type dust collecting equipment, relates in particular to a kind of location blowback Low-Pressure Pulse Bag Filter.
Background technology
At present, sack cleaner is the highest equipment of efficiency of dust collection in the dry dust removal equipment, has been widely used in industries such as electric power, metallurgy, chemical industry, mine, grain processing, waste incineration, building materials.Dusty gas flows through filter bag under pressure; Filter through filter bag, the dust in the dusty gas is blocked on the filter bag outer surface and forms dust layer, and through deashing device dust layer is blown off into ash bucket; Filter the back clean gas and pass filter bag, enter atmosphere by air-purifying chamber.The kind of sack cleaner is different, and its main distinction is in purge mode.
The development of bag type dust removing technology is an outstanding feature with the filter bag ash removal mode, has roughly experienced several stages such as mechanical vibrator, atmosphere blowback, air box impulse blowback, tubular type pulse backblowing, action of low-voltage pulse rotation blowback.According to the height of deashing pressure, pulse backblowing class sack cleaner roughly is divided into three types of high pressure, middle pressure and action of low-voltage pulse blowbacks, and its developing direction is a low pressure atm number injection method, is representative with action of low-voltage pulse rotation blowback dedusting technology especially.But not enough below it exists: structure is made complicated, and the mechanical rotation arm can produce serious wearing and tearing; It is little that individual module is handled air quantity, must arrange ringwise because of its filter bag, causes deduster inner space utilization rate low; It is bigger that the deduster physical dimension is influenced by the deashing mechanism form; It is complicated that filter bag circumferential arrangement mode causes the deduster interior flow field to change, and causes the running resistance of deduster self structure higher.
Summary of the invention
The purpose of the utility model is in order to solve the deficiency of existing sack cleaner reverse gas cleaning mechanism; A kind of location blowback Low-Pressure Pulse Bag Filter is provided; And through optimal design, provide that a nested structure is simple, the location reverse gas cleaning mechanism of linear reciprocation horizontal movement.
A kind of location blowback Low-Pressure Pulse Bag Filter that the utility model proposes comprises support, flue-dust retainer, housing, card, air inlet smoke box, airflow uniform distribution device, butterfly import baffle door, the smoke box of giving vent to anger, butterfly outlet damper door, filter bag device and walking location reverse gas cleaning mechanism.
Rack-mount side's housing is divided into the air-purifying chamber on top and the dirt air chamber of bottom by the card of horizontal arrangement.Dirt air chamber front side connects the air inlet smoke box, and the air inlet smokebox front is equipped with butterfly import baffle door, in the air inlet smoke box, airflow uniform distribution device is installed, and the bottom of dirt air chamber connects flue-dust retainer; The rear side of air-purifying chamber connects the smoke box of giving vent to anger, and the smoke box rear end of giving vent to anger is equipped with butterfly outlet damper door.Card has the hole, and the hole is matrix form and arranges.The filter bag device is installed on the card, and in the filter bag device combine closely under sealing function in the sack of filter bag and the hole on the card, and the bag of filter bag is positioned at the dirt air chamber.
Walking location reverse gas cleaning mechanism comprises: drive unit, level winding-up pipe, high temperature resistant air hose, air accumulator, pulse valve, deashing source of the gas pipeline, track and transmission device.Drive unit is installed in the outside of air-purifying chamber front side; Air accumulator, pulse valve and deashing source of the gas pipeline are arranged on the outside at air-purifying chamber top.Track is fixedly installed on the card in the air-purifying chamber, is provided with two tracks in every dedusting passage, and two tracks are positioned at the relative both sides of card, track of every side.Level winding-up pipe support is located on two tracks, and the outlet side of level winding-up pipe is perpendicular to the sack of filter bag, and the air inlet end of level winding-up pipe connects high temperature resistant air hose.High temperature resistant air hose stretches out from the top of housing, connects air accumulator and pulse valve successively, and air accumulator is communicated with air machinery through deashing source of the gas pipeline.The conducting of air-flow between pulse valve control air accumulator and the high temperature resistant air hose.In the deashing process, drive unit is done the linear reciprocation horizontal movement through transmission device control level winding-up pipe along track.Level winding-up pipe moves above filter bag successively, by row filter bag is carried out blowback.
The advantage and the beneficial effect of the utility model are:
1, a kind of location blowback Low-Pressure Pulse Bag Filter of providing of the utility model, simple and reliable for structure, filter bag is arranged and not limited by the deashing mechanism form, and arrangement mode is flexible, can maximally utilise the deduster inner space.Through test, the utility model list cover walking location reverse gas cleaning mechanism maximum processing filter area can reach 11500m
2, deduster can be single channel or multichannel, according to user's request, a cover or many cover deashing mechanisms can be set in the single channel, is used to control deashing speed.Whole deduster can be combined by a plurality of dedusting single channel building block systems, is used to handle big air quantity dusty gas.
2, on action of low-voltage pulse class deduster, adopt filter bag matrix form arrangement first, flue gas flows smooth and easy in deduster internal flow process, and the air motion direction does not change because of filter bag stops repeatedly, and the deduster structural drag is little.
3, the walking location reverse gas cleaning mechanism that is adopted, the pulse valve quantity of use is few, and ash-clearing structure is simple, in the fault rate that has reduced the equipment operation simultaneously, also is convenient to the maintenance and the maintenance of equipment.
4, the walking location reverse gas cleaning mechanism that is adopted, the deashing pressure of its corresponding single filter bag, deashing tolerance, the deashing frequency is variable element.Can change the deduster operational factor according to the ruuning situation of deduster preposition equipment, can realize the powerful deashing when special operation condition causes dust viscosity to increase, the low pressure winding-up in the time of can realizing nominal situation again.When guaranteeing the deashing ability, also guaranteed filter bag rational service life.
5, steelplate punching bending machining forming technique is adopted in the card perforate, and card hole and filter pocket mouths contact position are rounding off, help protecting filter bag to avoid mechanical damage; Blanking curved shaping has increased card intensity, can suitably reduce card thickness, reduces cost.
Description of drawings
Fig. 1 is the structural representation of the utility model location blowback Low-Pressure Pulse Bag Filter;
Fig. 2 is the structural representation that deduster shown in Figure 1 is seen from the right side;
Fig. 3 a is the cutaway view in single card hole; Fig. 3 b is the vertical view in single card hole;
Fig. 4 is the structural representation of filter bag device;
Fig. 5 is a filter bag arrangement mode sketch map;
Fig. 6 is the connection sketch map of level winding-up pipe in the reverse gas cleaning mechanism of walking location;
Fig. 7 is the flow chart of steps of the utility model dust collection method.
Among the figure:
1-support, 2-flue-dust retainer, 3-dirt air chamber, 4-air inlet smoke box, 5-airflow uniform distribution device, 6-butterfly import baffle door,
7-filter bag device, 8-card, 9-drive unit, 10-level winding-up pipe, the high temperature resistant air hose of 11-, 12-air-purifying chamber,
13-air accumulator, 14-pulse valve, 15-deashing source of the gas pipeline, 16-give vent to anger smoke box, 17-butterfly outlet damper door, 18-track,
19-transmission device, 20-housing, 21-stair and platform, 22-air machinery; 81-card hole; The 71-filter bag; 72-bag cage;
73-sack hold down gag; 74-filter bag positioner.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the technical scheme of the utility model is elaborated.
As depicted in figs. 1 and 2; The described a kind of location blowback Low-Pressure Pulse Bag Filter of the utility model embodiment comprises: support 1, flue-dust retainer 2, housing 20, card 8, air inlet smoke box 4, inlet air flow even distribution device 5, butterfly import baffle door 6, filter bag device 7, the smoke box 16 of giving vent to anger, butterfly outlet damper door 17, stair and platform 21 and walking location reverse gas cleaning mechanism.
The housing 20 that is arranged on the support 1 is divided into the air-purifying chamber 12 on top and the dirt air chamber 3 of bottom by the card 8 of horizontal arrangement.The front side of dirt air chamber 3 connects air inlet smoke box 4, and air inlet smoke box 4 front ends are equipped with butterfly import baffle door 6, and airflow uniform distribution device 5 is installed in the air inlet smoke box 4, and the bottom of dirt air chamber 3 connects flue-dust retainer 2.Air-purifying chamber 12 rear sides connect the smoke box 16 of giving vent to anger, and smoke box 16 rear ends of giving vent to anger are equipped with butterfly outlet damper door 17.Stair and platform 21 extend to the top of housing 20 by the bottom of support 1, and stair and platform 21 are used to connect deduster and respectively overhaul position and functional unit, make the operator be convenient to reach each functional unit and maintenance position.Filter bag device 7 is installed on the card 8, and the hole of being opened on filter bag opening and the card 8 is connected, and the filter bag bag is positioned at dirt air chamber 3.The top of filter bag device 7 is provided with walking location reverse gas cleaning mechanism.
The walking location reverse gas cleaning mechanism that the utility model provides comprises drive unit 9, level winding-up pipe 10, high temperature resistant air hose 11, air accumulator 13, pulse valve 14, deashing source of the gas pipeline 15, track 18, transmission device 19 and air machinery 22 etc.Drive unit 9 is installed in the outside of air-purifying chamber 12 front sides; Air accumulator 13, pulse valve 14 and deashing source of the gas pipeline 15 are arranged on the outside at air-purifying chamber 12 tops.Track 18 is fixedly installed on the top of said card 8 in the air-purifying chamber 12, and two tracks 18 are set in every deduster (passage), is positioned at the passage both sides, and is concrete, and two tracks 18 are positioned at the relative both sides of card 8, track 18 of every side.Level winding-up pipe 10 is erected on the said track 18; The outlet side of level winding-up pipe 10 is perpendicular to filter bag opening; The air inlet end of level winding-up pipe 10 connects high temperature resistant air hose 11; High temperature resistant appendix 11 stretches out from the top of housing 20, is communicated with pulse valve 14, air accumulator 13, deashing source of the gas pipeline 15, air machinery 22 etc. successively.Air accumulator 13 is communicated with air machinery 22 through deashing source of the gas pipeline 15.The conducting of air-flow between pulse valve 14 control air accumulators 13 and the high temperature resistant air hose 11.Drive unit 9 is done the linear reciprocation horizontal movement through transmission device 19 control levels winding-up pipe 10 along track.
As shown in Figure 4, filter bag device 7 comprises filter bag 71, bag cage 72, sack hold down gag 73 and filter bag positioner 74.Filter bag device 7 comprises some filter bags 71, and is as shown in Figure 5, and filter bag 71 is matrix form by downstream direction and arranges in dirt air chamber 3.Filter bag 71 is long flat filter bag, and the filter bag length direction is identical with dirt air chamber 3 interior airflow directions.Every filter bag 71 is provided with a bag cage 72, and bag cage 72 is the flat metallic framework, is installed in the inside of filter bag 71, and supporting filter bag 71 maintenance cross sections is flat.Sack hold down gag 73 is installed in the sack of filter bag 71, is used to compress filter bag opening and card hole 81.Filter bag positioner 74 is installed on the filter bag bottom, confirms the relative position of 71 of every filter bags.
As shown in Figure 6; Drive unit 9 connects transmission device 19; Drive unit 19 is arranged on the direction vertical with level winding-up pipe 10, and level winding-up pipe 10 is connected on the transmission device 19, and drive unit 9 is done the linear reciprocation horizontal movement through transmission device 19 control levels winding-up pipe 10 along track.Evenly be provided with the winding-up mouth on the level winding-up pipe 10; One to arrange the number in card hole 81 identical on quantity and the pairing card of winding-up mouthful; The sack of a filter bag of each winding-up mouthful corresponding filter bag device 7; In the deashing process every filter bag center is positioned winding-up, the duration of winding-up, jetting pressure and the winding-up frequency are set and adjustment through control program.
Deduster in the foregoing description is a single channel, and the walking location reverse gas cleaning mechanism more than a group also can be set in single channel, and every group of walking location reverse gas cleaning mechanism is responsible for the filter bag group of some is carried out reverse gas cleaning.Every group of walking located in the reverse gas cleaning mechanism all to an air accumulator 13 and a pulse valve 14 should be arranged.Deduster also can be set to multichannel, is combined by above-mentioned single pass deduster building block system, is applicable to the processing of big air quantity dusty gas.
The utility model has proposed a kind of dust collection method to above-mentioned deduster, and is specifically as shown in Figure 7, comprises the steps:
Step 1: open butterfly import baffle door 6 and butterfly outlet damper door 17, under the system pressure effect, dusty gas gets into air inlet smoke box 4, after airflow uniform distribution device 5 is adjusted into uniform air flow, gets into dirt air chamber 3.
Step 2: after filter bag device 7 filtered, dust was blocked in the outer surface of filter bag to dusty gas in dirt air chamber 3, and purified gas gets into air-purifying chamber 12 through the filter bag outlet, and smoke box 16 is discharged deduster with butterfly outlet damper door 17 through giving vent to anger.
Step 3: start walking location reverse gas cleaning mechanism.Increase along with filtration time; The dust that is arrested in the filter bag outer surface increases gradually, and dust layer constantly increases progressively, thickening; The filter bag outer surface adheres to the dust layer resistance and strengthens; When resistance increases to deashing device startup setting numerical value, control program output enabling signal, walking location reverse gas cleaning mechanism starts.The numerical value that the deashing device of setting starts to be provided with voluntarily by the user as required.
Step 4: after receiving the deashing enabling signal; Drive unit 9 starts, and through transmission device 19 transmission of power is jetted to level and manages 10, and level winding-up pipe 10 prolongs the directed rectilinear motion of track 18 beginnings; When the winding-up mouth of level winding-up pipe 10 moves to the top at one group of filter pocket mouths center; The control program of walking location reverse gas cleaning mechanism sends the instruction of supplying gas, and pulse valve 14 is opened, and action of low-voltage pulse deashing source of the gas is delivered to level winding-up pipe 10 through deashing source of the gas pipeline 15 and high temperature resistant air hose 11; Level winding-up pipe 10 arrives each winding-up mouth with action of low-voltage pulse deashing source of the gas mean allocation, delivers in the filter bag corresponding with the mouth of jetting through the winding-up mouth of level winding-up pipe 10 again.In the winding-up process, the pressure of pulse valve winding-up, the tolerance of winding-up, the frequency of winding-up can be passed through program setting.After delegation's filter bag ash removal of level winding-up pipe 10 current correspondences finished, walking location reverse gas cleaning mechanism sent the walking instruction, and level winding-up pipe 10 continues directed moving, and repeated the winding-up action when moving to the top at next adjacent lines filter pocket mouths center.
Step 5: behind each row filter bag of this deduster passage deashing end successively, 10 counter motions of level winding-up pipe turn back to initial position, and deashing process finishes.Level winding-up pipe 10 is seamless pressure pipes, has several winding-up apertures by filter bag quantity above.The technical essential of winding-up pipe be to jet pipe diameter, perforate quantity, perforate size and winding-up center will be mated to the distance of filter pocket mouths each other.In the deashing process, the dust that is captured by the filter bag device falls into flue-dust retainer 2.
This patent is not limited to above-mentioned preferred forms; Anyone can draw other various forms of products under the enlightenment of this patent; No matter but on its shape or structure, do any variation; Every have identical with a application or akin technical scheme, all drops within the protection domain of this patent.
Claims (8)
1. a location blowback Low-Pressure Pulse Bag Filter is characterized in that: comprise support (1), flue-dust retainer (2), housing (20), card (8), air inlet smoke box (4), airflow uniform distribution device (5), butterfly import baffle door (6), the smoke box of giving vent to anger (16), butterfly outlet damper door (17), filter bag device (7) and walking location reverse gas cleaning mechanism; The housing (20) that is installed in support (1) top is divided into the air-purifying chamber (12) on top and the dirt air chamber (3) of bottom by the card (8) of horizontal arrangement; Dirt air chamber (3) front side connects air inlet smoke box (4), and air inlet smoke box (4) front end is equipped with butterfly import baffle door (6), and airflow uniform distribution device (5) is installed in air inlet smoke box (4), and the bottom of dirt air chamber (3) connects flue-dust retainer (2); The rear side of air-purifying chamber (12) connects the smoke box (16) of giving vent to anger, and the smoke box of giving vent to anger (16) rear end is equipped with butterfly outlet damper door (17); Card (8) has hole (81), and hole (81) are matrix form and arrange; Filter bag device (7) is installed on the card (8), and in the filter bag device (7) combine closely under sealing function in the sack of filter bag and the hole on the card (8), and the bag of filter bag is positioned at dirt air chamber (3);
Walking location reverse gas cleaning mechanism comprises: drive unit (9), level winding-up pipe (10), high temperature resistant air hose (11), air accumulator (13), pulse valve (14), deashing source of the gas pipeline (15), track (18) and transmission device (19); Drive unit (9) is installed in the outside of air-purifying chamber (12) front side; Air accumulator (13), pulse valve (14) and deashing source of the gas pipeline (15) are arranged on the outside at air-purifying chamber (12) top; Track (18) is fixedly installed on the card (8) in the air-purifying chamber (12), is provided with two tracks (18) in each dedusting passage, and two tracks (18) are positioned at the relative both sides of card (8), a track of every side (18); Level winding-up pipe (10) is erected on two tracks (18); The outlet side of level winding-up pipe (10) is perpendicular to the sack of filter bag; The air inlet end of level winding-up pipe (10) connects high temperature resistant air hose (11); High temperature resistant air hose (11) stretches out from the top of housing (20), connects air accumulator (13) and pulse valve (14) successively, and air accumulator (13) is communicated with air machinery (22) through deashing source of the gas pipeline (15); The conducting of air-flow between pulse valve (14) control air accumulator (13) and the high temperature resistant air hose (11); In the deashing process, drive unit (9) is done the linear reciprocation horizontal movement through transmission device (19) control level winding-up pipe (10) along track.
2. a kind of location blowback Low-Pressure Pulse Bag Filter according to claim 1; It is characterized in that; Described deduster also comprises stair and platform (21); Stair and platform (21) extend to the top of housing (2) by the bottom of support (1), are used for each functional unit and maintenance position that the operator is convenient to reach deduster.
3. a kind of location blowback Low-Pressure Pulse Bag Filter according to claim 1 is characterized in that, the hole (81) of opening on the said card (8) adopts the steelplate punching bending machining to be shaped, with the sack contact position of filter bag be rounding off.
4. a kind of location blowback Low-Pressure Pulse Bag Filter according to claim 3 is characterized in that the hole (81) on the described card (8) is long flat.
5. a kind of location blowback Low-Pressure Pulse Bag Filter according to claim 1 is characterized in that, described filter bag device (7) comprises filter bag (71), bag cage (72), sack hold down gag (73) and filter bag positioner (74); Filter bag (71) is long flat, in dirt air chamber (3), is matrix form by downstream direction to arrange, and the inside of every filter bag (71) is equipped with a bag cage (72), and bag cage (72) is the flat metallic framework, and the cross section that supports filter bag (71) remains flat; Sack hold down gag (73) is installed in the sack of filter bag (71), is used for filter bag opening compressed being connected the hole (81) of being opened on the card (8); Filter bag positioner (74) is installed in filter bag (71) bottom, is used for confirming the relative position between every filter bag (71).
6. a kind of location blowback Low-Pressure Pulse Bag Filter according to claim 1; It is characterized in that described level winding-up pipe (10) evenly is provided with the winding-up mouth on it; The number in a hole (81) of arranging is identical on quantity and the pairing card of winding-up mouthful; The sack of a filter bag of each winding-up mouthful corresponding filter bag device (7) positions winding-up to every filter bag center in the deashing process, and the duration of winding-up, jetting pressure and the winding-up frequency are set and adjustment through control program.
7. according to the arbitrary described a kind of location blowback Low-Pressure Pulse Bag Filter of claim 1-6, it is characterized in that, be provided with one group of above walking location reverse gas cleaning mechanism in the described deduster.
8. according to the arbitrary described a kind of location blowback Low-Pressure Pulse Bag Filter of claim 1-6, it is characterized in that described deduster is the single channel deduster, the multichannel deduster that perhaps is combined into for plural single channel deduster building block system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201987619U CN202555101U (en) | 2012-05-04 | 2012-05-04 | Positioning blowback low-pressure impulsion bag type dust collector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201987619U CN202555101U (en) | 2012-05-04 | 2012-05-04 | Positioning blowback low-pressure impulsion bag type dust collector |
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| Publication Number | Publication Date |
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| CN202555101U true CN202555101U (en) | 2012-11-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012201987619U Expired - Fee Related CN202555101U (en) | 2012-05-04 | 2012-05-04 | Positioning blowback low-pressure impulsion bag type dust collector |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102657982A (en) * | 2012-05-04 | 2012-09-12 | 李鑫 | Positioning and back-blowing low-voltage pulse bag type dust remover and dust removing method thereof |
| CN105536375A (en) * | 2016-03-15 | 2016-05-04 | 张成峰 | Automatic dust shaking method of bag type dust removal device and novel bag type dust removal device |
| CN109603337A (en) * | 2019-02-20 | 2019-04-12 | 北京博电兴源节能科技有限公司 | A kind of promotion door panel-type air-flow bag type dust-remover |
| CN114405260A (en) * | 2022-01-18 | 2022-04-29 | 长春三友智造科技发展有限公司 | Treatment system and process for flue gas generated by waste incineration |
| CN115591325A (en) * | 2022-10-26 | 2023-01-13 | 浙江嘉鑫机械部件有限公司（Cn） | Device and method for testing and evaluating bag type dust removal pulse blowing performance |
-
2012
- 2012-05-04 CN CN2012201987619U patent/CN202555101U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102657982A (en) * | 2012-05-04 | 2012-09-12 | 李鑫 | Positioning and back-blowing low-voltage pulse bag type dust remover and dust removing method thereof |
| CN105536375A (en) * | 2016-03-15 | 2016-05-04 | 张成峰 | Automatic dust shaking method of bag type dust removal device and novel bag type dust removal device |
| CN109603337A (en) * | 2019-02-20 | 2019-04-12 | 北京博电兴源节能科技有限公司 | A kind of promotion door panel-type air-flow bag type dust-remover |
| CN109603337B (en) * | 2019-02-20 | 2021-03-30 | 北京博电兴源节能科技有限公司 | Lifting door plate type air flow ash removal bag type dust collector |
| CN114405260A (en) * | 2022-01-18 | 2022-04-29 | 长春三友智造科技发展有限公司 | Treatment system and process for flue gas generated by waste incineration |
| CN115591325A (en) * | 2022-10-26 | 2023-01-13 | 浙江嘉鑫机械部件有限公司（Cn） | Device and method for testing and evaluating bag type dust removal pulse blowing performance |
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| GR01 | Patent grant | ||
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Granted publication date: 20121128 Termination date: 20140504 |