CN1093435C - Wet electric dust-removing process and its special-purpose equipment - Google Patents
Wet electric dust-removing process and its special-purpose equipment Download PDFInfo
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- CN1093435C CN1093435C CN00110876A CN00110876A CN1093435C CN 1093435 C CN1093435 C CN 1093435C CN 00110876 A CN00110876 A CN 00110876A CN 00110876 A CN00110876 A CN 00110876A CN 1093435 C CN1093435 C CN 1093435C
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- dust
- gas
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Abstract
The present invention relates to a wet electric dust removing technology and special equipment thereof, which belongs to a gas dust removing technology. The present invention is characterized in that an air inlet is arranged on the middle upper part of a dust remover; a lower tube plate is arranged in the spacing in a barrel body under an upper tube plate; a tangential hole of a dust collecting tube is arranged on the tube wall between the upper tube plate and the lower tube plate; gas moves from top to bottom and then from bottom to top, and enters a dust removal area in the dust collecting tube; the processes of electrification, movement, settlement and washing of dust particles in the gas are completed under the action of a 40 to 70KV high voltage electric field, dust particles in the gas in the dust collecting tube are washed away by double water film water of overflow water and tangential water, and the gas of which the dust content is 2 mg/Nm<3> is conveyed to users from an air outlet.
Description
Technical field
The Wet Electrostatic Precipitator Technology And Special Equipment that the present invention relates to, belong to the dedusting technical field, be specifically for produce diphenyl methane-4,4 '-reduce technology and the special equipment that contains micro-dust in the CO gas with wet electric dust-removing in the vulcabond preorder technology.
Background technology
Existing produce diphenyl methane-4,4 '-contain the 2g/Nm that has an appointment in the used CO gas of vulcabond
3Dust because its existence influences the conveying of CO gas, the service life of dehumidizer, the most important thing is to have influenced diphenyl methane-4,4 '-quality of vulcabond.And existing Wet Electrostatic Precipitator Technology And Special Equipment, technology falls behind, and device structure is unreasonable, particularly because the expansion of output requires deduster to handle tolerance by 350m
3/ h is increased to 1500m
3/ h, just more not satisfied requirement, related process that a kind of efficiency of dust collection is high and relevant device are not found at present as yet.
Summary of the invention
Purpose of the present invention is intended to improve above-mentioned deficiency, provide a kind of for produce diphenyl methane-4,4 '-the used CO gas of vulcabond in dustiness less than 2mg/Nm
3Wet Electrostatic Precipitator Technology And Special Equipment.
In order to achieve the above object, the special equipment of wet electric dust-removing process of the present invention, be on the basis of existing electric cleaner structure, realize by improvement, it comprises a cylindrical shell 19, one air inlet 9 is arranged on cylindrical shell 19 sidewalls, outlet of sewer 16, manhole 15, blast hole 18, one gas outlet 2 is arranged above cylindrical shell 19, shower water inlet 1, have above in cylindrical shell 19 one with shower water inlet 1 water inlet pipe that communicates 30, shower nozzle 3 is arranged on the water inlet pipe 30, one upper perforated plate 20 that is tightly connected with cylindrical shell is arranged above in cylindrical shell 19, upper perforated plate 20 has a plurality of holes, dust leg 11 is installed in each hole, dust leg 11 and upper perforated plate 20 are for being tightly connected, one overflow water inlet 22 is arranged on the outer wall of upper perforated plate 20 overhead cylinder 19, interpolation one overflow funnel 7 above each dust leg 11, by pad 28, screw 31 and dust leg 11 fixing seals, there is a dust leg fixed mount 12 that dust leg 11 is fixing in each dust leg 11 lower end, at cylindrical shell 19 inner bottom parts one control of dust hyponome 17 is arranged, and communicate with outlet of sewer 16, on the outer circle wall above the cylindrical shell 19, fix a porcelain vase chamber 4 by a flange 32, one seal receptacle 25 is arranged in the porcelain vase chamber 4, high-tension porcelain insulator 5, one suspension rod 26 is arranged in the high-tension porcelain insulator 5, high-tension bus-bar 29 is received in the suspension rod and in a discharge coil holder 6 by junction box 23 and is electrically connected, by porcelain vase loam cake 24, porcelain vase lower cover 27 is fixed together suspension rod 26 and high-tension porcelain insulator 5, hang a discharge lines 10 in each dust leg 11, every discharge lines 10 is connected in parallel on the discharge coil holder 6, every discharge lines 10 lower ends connect a weight 14, between every discharge lines 10, connect the anti-rocker 13 of a discharge lines, be characterized in that air inlet 9 is located on the sidewall of cylindrical shell middle and upper part, in cylindrical shell 19 with upper perforated plate 20 lower perforated plate 8 that is tightly connected separately, lower perforated plate 8 is established the hole concentric up and down with upper perforated plate 20, each dust leg 11 is enclosed within the hole, and be tightly connected with lower perforated plate 8, on the sidewall of lower perforated plate 8 overhead cylinder 19, establish a tangential water inlet 21, on the circumferential wall of each dust leg 11 between upper perforated plate 20 and the lower perforated plate 8, establish tangential hole 33.
In order to achieve the above object, wet electric dust-removing process of the present invention, it comprises from air inlet 9 and delivering gas in the deduster, by high-voltage line voltage is added on the discharge lines 10 in the dust leg 11, gas enters in the dust leg 11, promptly enter dedusting area, the electric cleaner of charged running is under the effect of high pressure, corona current and electric-field intensity have been produced, under the effect of electric field force, grit in the gas has been finished charged, move, sedimentation, flushing process, charged grit in the gas moves to dust leg, gas is detained in dust leg 11, operation obtains dedusting, through at last gas outlet 2, the grit that is absorbed in the control of dust tube wall is by spray, after the flushing of overflow water, discharge by the outlet of sewer on the deduster 16, be characterized in that gas is that middle and upper part air inlet 9 from deduster enters in the deduster, gas from top to bottom, enter from top to bottom again in the dedusting area in the dust leg 11, the high pressure that joins on the discharge lines 10 by high-tension bus-bar 29 is 40-70KV, the corona current of discharge lines 10 is 0.5-1mA/m, the operating path of gas in dust leg 11 is 5-6 rice, the holdup time of gas in dust leg is 10-16S, the water that flushing process is used is shower water, overflow water, below the overflow water inlet, be provided with tangential water inlet, make the tangential water in the dust leg 11 form the helical form moisture film, thereby overflow water is formed necessary replenishing.
The present invention is by moving on to the middle and upper part with air inlet from the bottom of deduster, saved distribution grid, gas from top to bottom, enter into dedusting zone in the dust leg more from top to bottom, gas is evenly distributed, dwindled device height 2-3 rice, spacing increases by a lower perforated plate again in the upper perforated plate bottom, and on each the dust leg circumferential wall between upper perforated plate and the lower perforated plate, establish tangential hole, establish tangential water inlet on the corresponding barrel wall, the water of coming in from tangential water inlet forms a spiral water desert and washes away downwards entering into by the tangential hole on each dust leg in the dust leg like this, give replenishing of necessity of overflow water, under the effect of discharge lines, make the dust in the CO gas move to the dust leg tube wall, under the effect of overflow water and tangential water, flow on the control of dust hyponome of deduster bottom, drain by outlet of sewer, the present invention has improved the dust removing effects of CO gas by the improvement of structure and technology, can make the user use dustiness 2mg/Nm
3CO gas.
Description of drawings:
Fig. 1 is the structural representation of special equipment of the present invention;
Fig. 2 is the I portion structure for amplifying schematic diagram of Fig. 1;
Fig. 3 is the A-A cutaway view of Fig. 2;
Fig. 4 is the II portion structure for amplifying schematic diagram of Fig. 1.
The explanation of accompanying drawing drawing:
1, the shower water inlet, 2 gas outlets, 3 shower nozzles, porcelain vase chambers 4,5 high-tension porcelain insulators, 6 discharge coil holders, 7 overflow funnels, 8 lower perforated plates, 9 air inlets, 10 discharge lines, 11 dust legs, 12 dust leg fixed mounts, 13 discharge lines are prevented rocker, 14 weights, 15 maintenance hand-holes, 16 outlets of sewer, 17 control of dust hyponomes, 18 blast holes, 19 cylindrical shells, 20 upper perforated plates, 21 tangential water inlets, 22 overflow waters inlet, 23 junction boxes, 24 porcelain vase loam cakes, 25 seal receptacles, 26 suspension rods, 27 porcelain vase lower covers, 28 pads, 29 high-tension bus-bars, 30 water inlet pipes, 31 screws, 32 flanges, 33 tangential holes, 34 pads, 35 screws, 36 glands.
The specific embodiment
In order to understand better and to implement, be embodiment with the accompanying drawing below, combined process further specifies as follows: at first the special equipment Wet-electric duster is processed.Earlier cylindrical shell 19 is processed the last soldering and sealing of the loam cake of cylindrical shell 19.Open an outlet of sewer 16 in cylindrical shell 19 circumferential side walls bottom, link on the control of dust hyponome 17 in the cylindrical shell 19 by a sewage pipe, control of dust hyponome 17 and cylindrical shell 19 inner peripheral wall seal weldings are together, above cylindrical shell 19 circumferential side walls bottom, control of dust hyponome 17, respectively open a hole, one hole is maintenance hand-hole 15, one hole is a blast hole 18, on the cylindrical shell upper portion side wall, can open a blast hole again, blast hole 18 is when the gas pressure in the cylindrical shell reaches capacity, can reach reliable pressure release, prevent the purpose of cylindrical shell blast.Gas inlet 9 is located on the cylindrical shell 19 middle and upper part outer walls, after can making CO gas enter in the cylindrical shell like this, pass to turn to behind the dust leg that stands in great numbers and move downward the dust arrester bottom, then turn to again and upwards enter dust leg, turn to through twice to make distribution of gas even substantially, further reach dust removing effects.Upper perforated plate 20 and lower perforated plate 8 are adopted the carbon steel sheet processing and fabricating, internal diameter according to cylindrical shell 19 decides size, concentric up and down respectively, each bores 24-28 hole, dust leg fixed mount 12 gets final product than cylinder internal diameter is a little bit smaller slightly, 24-28 hole of same brill, the three is concentric, respectively 24-28 dust leg 11 passed the hole on the dust leg fixed mount 12 then respectively, and weld with dust leg fixed mount 12 respectively, and on the dust leg fixed mount 12 passage is arranged, then dust leg 11 is passed in the hole on the lower perforated plate 8 respectively, lower perforated plate 8 is welded by position shown in Figure 1 and cylindrical shell 19 each dust leg 11 sealing, then respectively on the circumferential wall of each dust leg 11 between upper perforated plate 20 and the lower perforated plate 8 tangentially drilling to hole 33, tangential hole 4-8 is for well, then each dust leg 11 is passed in the hole of upper perforated plate 20 respectively, upper perforated plate 20 and cylindrical shell 19 inner wall sealings are welded, then each overflow funnel 7 is inserted in each dust leg 11 inwalls top, respectively by pad 28, screw 31 is fixed on the upper perforated plate 20 and with upper perforated plate and seals, at upper perforated plate 20, respectively open overflow water inlet 22 on the cylinder lateral wall of lower perforated plate 8 correspondences, tangential water inlet 21.The internal diameter of dust leg 11 can adopt 200-300mm, dust leg cross section 1.37375m
2, dust leg area 109.9m
2, control of dust pipe range 5-6 rice is advisable.Dust leg distributes for square arrangement in cylindrical shell.The lid of cylindrical shell 19 is a taper shape, open a gas outlet 2 on the end points, cover out shower water inlet 1, link in the cylindrical shell 19 by a water inlet pipe 30,7 shower nozzles 3 can be installed on the water inlet pipe 30, on the outer circle wall above the cylindrical shell 19, fix 4 porcelain vase chambers 4 by flange 32 respectively, each porcelain vase is indoor a high-tension porcelain insulator 5, seal receptacle 25, one hollow suspension rod 26 is arranged in the high-tension porcelain insulator 5, high-tension bus-bar 29 is received in the hollow suspension rod 26 by junction box 23,4 high-tension bus-bars are electrically connected with 2 discharge coil holders 6 respectively, by porcelain vase loam cake 24, porcelain vase lower cover 27 is fixed together suspension rod 26 and high-tension porcelain insulator 5, in order to prevent that high-voltage line from shaking, cause electric spark, each high-tension porcelain insulator 5 is respectively by gland 36, pad 34, screw 35 is fixed on the seal receptacle 25,28 discharge lines 10 are connected in parallel on two discharge coil holders 6, and pass dust leg 11 respectively, discharge lines 10 is than about 1 meter of dust leg 11 length, discharge lines 10 terminations that are exposed at each dust leg lower end connect a weight 14, discharge lines 10 is a twist shape, dust collecting effect can be more better like this, in order to prevent that the discharge lines 10 of discharge lines 10 swings above each weight 14 from connecting the anti-rocker 13 of a discharge lines, whole erection finishes.
When producing diphenyl methane-4,4 '-when vulcabond preorder technology need be used CO gas, at this moment in the time of will beginning dedusting to CO gas, enter deduster top by the air inlet on the cylindrical shell 9, gas from top to bottom, motion from bottom to top again, in the motion process, gas passes the dust leg 11 that stands in great numbers, gas is evenly distributed, when arriving dust leg 11 bottoms, begin to move upward, enter in the dust leg 11, promptly enter dedusting area, discharge lines 10 taps into the high voltage source of coming by discharge coil holder 6 with junction box 23 joins, and high pressure is 40-70KV.Discharge lines is under the effect of high direct voltage, corona takes place around it, and the corona current of Chan Shenging flows to dust leg therefrom, and the corona current of discharge lines is advisable at 0.5-1mA/m, under the effect of electric field force, that the grit in the gas has been finished is charged, mobile, sedimentation, flushing process.Charged grit in the gas is to dust leg 11 motions, and gas holdup time in dust leg 11 is 10-16S, and operating path is a 5-6 rice, and the grit on dust leg 11 walls is by 3-9m
3The overflow water of/h, 3-9m
3The tangential hydration of/h becomes dual moisture film water to wash away, and moves to the grit on the discharge lines 10, obtains flushing by being installed in 7 industry water shower nozzle 3 intermittent showers in cylindrical shell top, is discharged by control of dust hyponome 17, outlet of sewer 16 by the grit that top flushing is got off.The CO gas of dedusting is fed to the user by gas outlet 2, makes gas reach dustiness 2mg/Nm
3Requirement.
The optimal selection of wet electric dust-removing process and special equipment technical parameter and structure:
1, the optimal selection of electric-field intensity and corona current; By the electric cleaner operation principle as can be known, dust removal process is charged by grit, gather dust and three processes of dust out form, and grit is charged and the process of gathering dust is all closely related with electric-field intensity and corona current, improve electric-field intensity, electric current can descend, increase electric current, electric-field intensity can reduce, in fact, electric-field intensity and corona current are subjected to the gas medium condition, anode-cathode distance, the influence of discharge lines thickness and shape, determine following scope of design through the experiment of configuration repeatedly: the dust leg diameter is between 200-300mm, the twist shape discharge lines is the most suitable removes tiny grit, its diameter is between 3-8mm, and voltage is between 40-70KV, and the discharge lines corona current is advisable at 0.5-1mA/m.
2, the optimal selection of moisture film water: moisture film water is one of key component that can this equipment reliability service, in order fully to guarantee the formation of moisture film water at tube wall, the present invention adopts dual moisture film to form structure, overflow water structure: the form that adopts the overflow funnel, tangential water-bound, this thread structure adopts double tube sheet, and dust leg part between two tube sheets is tangentially bored 4-8 aperture, the diameter in hole is defined as 8mm according to the water yield, adopts hermetically-sealed construction between dust leg and two tube sheets.By tangential water inlet feeding 3-9m is arranged between two tube sheets during work
3The recirculated water of/h, like this water just from aperture tangentially tube wall form the helical form moisture film, thereby overflow water is formed necessary replenishing, prevent that the district from appearring doing in dust leg, to guarantee the dedusting quality.
3, the optimal selection of process gas path, the gas holdup time in dust leg:
After the electric field of deduster and electric current are determined, it is different will arriving the required time of dust leg for the dust of different-grain diameter, the length of dust leg, holdup time and air velocity are three very important technological parameters, process gas path (dust leg) length: 5-6 rice, process gas is detained (delay in dust leg) time: 10-16S, unit cross section flow of process gas speed: 0.3-0.5m/s is than dust collector pole area: 200-300m
2/ m
3/ s.
Embodiment 3, and with nitrogen replacement post analysis oxygen content 0.15%, dustiness is 5g/Nm in the deduster
3CO gas with 1700m
3The amount of/h enters deduster, and the deduster working voltage is 70KV, and the discharge lines corona current is 1mA/m, and the overflow water yield is 9m
3/ h, the tangential water yield is 9m
3/ h, water spray 30m
3/ h, system operates steadily, and gas outlet gas dustiness is lower than 2mg/Nm
3
Claims (7)
1, a kind of wet electric dust-removing process, it comprises from air inlet (9) and delivering gas in the deduster, by high-voltage line voltage is added on the interior discharge lines (10) of dust leg (11), gas enters in the dust leg (11), promptly enter dedusting area, the electric cleaner of charged running is under the effect of high pressure, corona current and electric-field intensity have been produced, under the effect of electric field force, grit in the gas has been finished charged, move, sedimentation, flushing process, charged grit in the gas moves to dust leg, gas is detained in dust leg (11), operation obtains dedusting, through at last gas outlet (2), the grit that is absorbed in the control of dust tube wall is by spray, after the flushing of overflow water, discharge by the outlet of sewer on the deduster (16), it is characterized in that gas is that middle and upper part air inlet (9) from deduster enters in the deduster, gas from top to bottom, enter from top to bottom again in the dedusting area in the dust leg (11), the high pressure that joins on the discharge lines (10) by high-tension bus-bar (29) is 40-70KV, the corona current of discharge lines (10) is 0.5-1mA/m, the operating path of gas in dust leg (11) is 5-6 rice, the holdup time of gas in dust leg is 10-16S, the water that flushing process is used is shower water, overflow water, below the overflow water inlet, be provided with tangential water inlet, make the tangential water in the dust leg (11) form the helical form moisture film, thereby overflow water is formed necessary replenishing.
2, by the described wet electric dust-removing process of claim 1, it is characterized in that unit cross section process gas flow rates 0.3-0.5 meter per second, than dust collector pole area 200-300m
2/ m
3/ s.
3, by the described wet electric dust-removing process of claim 1, it is characterized in that the water spray that flushing process is used is 3-30m
3/ h, the overflow water yield is 3-9m
3/ h, the tangential water yield is 3-9m
3/ h.
4, realize the special equipment Wet-electric duster of the described wet electric dust-removing process of claim 1, it comprises a cylindrical shell (19), on cylindrical shell (19) sidewall, an air inlet (9) is arranged, outlet of sewer (16), manhole (15), blast hole (18), in cylindrical shell (19) top one gas outlet (2) is arranged, shower water inlet (1), there is a water inlet pipe (30) that communicates with shower water inlet (1) top in cylindrical shell (19), shower nozzle (3) is arranged on the water inlet pipe (30), there is a upper perforated plate (20) that is tightly connected with cylindrical shell the top in cylindrical shell (19), upper perforated plate (20) has a plurality of holes, dust leg (11) is installed in each hole, dust leg (11) and upper perforated plate (20) are for being tightly connected, one overflow water inlet (22) is arranged on the outer wall of upper perforated plate (20) overhead cylinder (19), at each dust leg (11) top interpolation one overflow funnel (7), by pad (28), screw (31) and dust leg (11) fixing seal, there is a dust leg fixed mount (12) that dust leg (11) is fixing in each dust leg (11) lower end, at cylindrical shell (19) inner bottom part one control of dust hyponome (17) is arranged, and communicate with outlet of sewer (16), on the outer circle wall of cylindrical shell (19) top, fix a porcelain vase chamber (4) by a flange (32), one seal receptacle (25) is arranged in the porcelain vase chamber (4), high-tension porcelain insulator (5), one suspension rod (26) is arranged in the high-tension porcelain insulator (5), high-tension bus-bar is received in the suspension rod and in a discharge coil holder (6) by junction box (23) and is electrically connected, by porcelain vase loam cake (24), porcelain vase lower cover (27) is fixed together suspension rod (26) and high-tension porcelain insulator (5), hang a discharge lines (10) in each dust leg (11), every discharge lines (10) is connected in parallel on the discharge coil holder (6), every discharge lines (10) lower end connects a weight (14), between every discharge lines (10), connect the anti-rocker (13) of a discharge lines, it is characterized in that gas inlet (9) is located on the sidewall of cylindrical shell middle and upper part, in cylindrical shell (19) with upper perforated plate (20) lower perforated plate (8) that is tightly connected separately, lower perforated plate (8) is established and the concentric up and down hole of upper perforated plate (20), each dust leg (11) is enclosed within the hole, and with lower perforated plate (8) sealed attachment, on the sidewall of lower perforated plate (8) overhead cylinder (19), establish a tangential water inlet (21), on the circumferential wall of each dust leg (11) between upper perforated plate (20) and the lower perforated plate (8), establish tangential hole (33).
5,, it is characterized in that the tangential hole (33) on each dust leg (11) is 4-8 by the special equipment Wet-electric duster of the described wet electric dust-removing process of claim 4.
6, by the special equipment Wet-electric duster of the described wet electric dust-removing process of claim 4, it is characterized in that high-tension porcelain insulator (5) is fixed on the seal receptacle (25) by gland (36), pad (34), screw (35) respectively.
7, by the described special equipment Wet-electric duster of claim 4, the internal diameter that it is characterized in that dust leg (11) is 200-300mm, and the length of dust leg (11) is 5-6 rice.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00110876A CN1093435C (en) | 2000-01-31 | 2000-01-31 | Wet electric dust-removing process and its special-purpose equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00110876A CN1093435C (en) | 2000-01-31 | 2000-01-31 | Wet electric dust-removing process and its special-purpose equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1272406A CN1272406A (en) | 2000-11-08 |
| CN1093435C true CN1093435C (en) | 2002-10-30 |
Family
ID=4580833
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00110876A Expired - Fee Related CN1093435C (en) | 2000-01-31 | 2000-01-31 | Wet electric dust-removing process and its special-purpose equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1093435C (en) |
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| CN101780435A (en) * | 2010-02-25 | 2010-07-21 | 宁波大学 | Wet static dedusting device |
| CN102688648A (en) * | 2012-05-31 | 2012-09-26 | 苏州欧蓝森环境设备有限公司 | Wet electro-static precipitator |
| CN103586135B (en) * | 2013-10-23 | 2017-01-25 | 华北电力大学（保定） | Formation mode of dust collection pole plate and ash removal water film of wet-type electric precipitator |
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| CN107029883B (en) * | 2017-06-09 | 2018-06-29 | 华中科技大学 | A kind of wet electrical dust precipitator dust collecting pole plate |
| CN107648967A (en) * | 2017-09-25 | 2018-02-02 | 江苏河海新能源股份有限公司 | A kind of liquid film plasma deduster |
| CN108187912A (en) * | 2018-01-24 | 2018-06-22 | 佛山市科蓝环保科技股份有限公司 | A kind of novel honeycomb electric field and the Industrial cleaning facility equipment containing the electric field |
| CN115121372B (en) * | 2022-05-31 | 2023-08-22 | 广东众大智能科技有限公司 | Exhaust gas treatment device |
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| US4308038A (en) * | 1979-05-10 | 1981-12-29 | Santek, Inc. | Inertial-electrostatic wet precipitator |
| US5039318A (en) * | 1988-11-04 | 1991-08-13 | Boliden Contech Ab | Device at wet electrostatic precipitator |
| CN2329446Y (en) * | 1998-02-16 | 1999-07-21 | 北京市劳动保护科学研究所 | Combined vertical cylinder type electric duster |
| CN2355807Y (en) * | 1998-12-11 | 1999-12-29 | 汤志群 | Concentric circle structure dry and wet two purpose static dust removing and coke removing device |
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|---|---|---|---|---|
| US4308038A (en) * | 1979-05-10 | 1981-12-29 | Santek, Inc. | Inertial-electrostatic wet precipitator |
| US5039318A (en) * | 1988-11-04 | 1991-08-13 | Boliden Contech Ab | Device at wet electrostatic precipitator |
| CN2329446Y (en) * | 1998-02-16 | 1999-07-21 | 北京市劳动保护科学研究所 | Combined vertical cylinder type electric duster |
| CN2355807Y (en) * | 1998-12-11 | 1999-12-29 | 汤志群 | Concentric circle structure dry and wet two purpose static dust removing and coke removing device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1272406A (en) | 2000-11-08 |
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