CN110732196A - Method for transforming electric dust collectors into pulse bag type dust collectors - Google Patents
Method for transforming electric dust collectors into pulse bag type dust collectors Download PDFInfo
- Publication number
- CN110732196A CN110732196A CN201911215330.1A CN201911215330A CN110732196A CN 110732196 A CN110732196 A CN 110732196A CN 201911215330 A CN201911215330 A CN 201911215330A CN 110732196 A CN110732196 A CN 110732196A
- Authority
- CN
- China
- Prior art keywords
- precipitators
- pulse
- filter
- air
- bag
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/023—Pockets filters, i.e. multiple bag filters mounted on a common frame
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/04—Cleaning filters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/48—Removing dust other than cleaning filters, e.g. by using collecting trays
Abstract
The invention provides a method for transforming electric dust collectors into pulse bag type dust collectors, which comprises the steps of (1) removing components in the electric dust collectors, namely, keeping an ash discharging system, an ash conveying system, an ash bucket, an air inlet/outlet and a box body outer wall plate of the electric dust collectors, removing polar lines, polar plates, a rapping system, a transformer, an upper frame, a lower frame and porous plates in an electric dust collector shell, changing an electric field chamber into a filter chamber, (2) installing a pattern plate, a baffle and a gas guide system, wherein the pattern plate is used for installing filter elements and is arranged above the inner side of the shell, filter chamber partition plates, filter chamber elements, an air inlet/outlet channel, a cleaning chamber, a pulse blowing system and a gas supply system are additionally arranged in the filter chamber, the air inlet/outlet partition plates are additionally arranged to form an air inlet/outlet channel, and an air purifying chamber is arranged outside the electric dust collector shell, (3) installing holes, a walkway and an escalator, installing holes, a walkway and an.
Description
Technical Field
The invention relates to the technical field of modification of dust removing equipment, in particular to a method for modifying electric dust collectors into pulse bag type dust collectors.
Background
The electrostatic precipitator is mainly used for collecting dust, and is widely applied to various industrial fields all over the world, including power generation, paper pulp, paper making, cement, mining, waste incineration, petrochemical production, steel production and the like.
The electrostatic precipitator operates very efficiently at stage when it is initially used, but as the years of use increase, its operating efficiency gradually decreases despite the use of appropriate maintenance measures, and the electrostatic precipitator fails to achieve the required very low emission levels over a long period of time, and as global air quality standards become more stringent, stack dust emission becomes an increasingly important factor in determining dust collection systems.
, the manufacturer has two solutions to the problem of poor operation of electrostatic precipitator, i.e. purchasing a new electrostatic precipitator to replace the old one, and modifying the internal structure of the old one with new parts.
Many manufacturers prefer to change the original electric dust collection mode into a filter element filtration dust collection mode, namely, a replaceable filter element is used for replacing a metal dust collection polar plate as a dust collection mode. However, considering the factors of increased equipment cost, time waste of production line retraining and the like, the cost of updating the old electrostatic precipitator or replacing the old electrostatic precipitator with a new bag-type dust collector is very high. For the reasons, most manufacturers avoid installing a new bag-type dust collector, and instead, a large amount of investment is used for improving the use effect of the original electric dust collector.
Based on the above problems, the modification of the electric dust remover into the pulse type bag dust remover is a problem to be solved urgently in the industry.
Disclosure of Invention
The invention aims to solve the problem that the gas discharged after the existing electrostatic dust collector is used for a long time cannot meet the required standard, and provides a method for transforming electric dust collectors into pulse bag type dust collectors aiming at the defects in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
method for transforming electric dust collector into pulse bag type dust collector, comprising the following steps:
(1) removing the internal components of the electric dust collector: the dust discharging system, the dust conveying system, the dust hopper, the air inlet and outlet and the outer wall plate of the box body of the electric dust collector are reserved, polar lines, polar plates, a rapping system, a transformer, an upper frame, a lower frame and a porous plate in the shell of the electric dust collector are removed, and an electric field chamber is changed into a filtering chamber;
(2) installing a pattern plate, a baffle and a gas guide system: a pattern plate for mounting a filter element is mounted above the inside of the shell, a filter chamber partition plate, a filter chamber element, an air inlet and outlet channel, a cleaning chamber, a pulse blowing system and an air supply system are newly added in the filter chamber, the air inlet and outlet partition plate is newly added to form the air inlet and outlet channel, and an air purifying chamber is mounted outside the shell of the electric dust collector;
(3) holes, walkways and escalators are installed, wherein holes, walkways and escalators are installed according to the positions of the air purifying chamber and the air inlet and outlet channel;
(4) installing a filter element: installing a filter element on the pattern plate according to the air quantity of the pulse injection system and the air inlet and outlet channel, the temperature of the air flow and the size of the electric dust collector;
(5) installing an ash removal system: a compressed air pipeline, a pulse valve, an air bag, a blow pipe and related electrical elements of the ash removal system are installed, and the differential pressure ash removal controller is connected with the pulse valve.
, the method also comprises the step of reforming the fan, which comprises the following steps:
(1) raising the full pressure of the fan to above 2800 Pa;
(2) and (4) modifying a fan control system according to the motor parameters of the fan, so that the final pollutant emission concentration is 10mg/m3, and the noise emission reaches the qualified standard.
, the step (1) further comprises the step of reforming the original inlet and outlet horns into the air inlet and outlet of the pulse bag type dust collector.
, the gas supply system includes a dual gas bag, a pulse valve, a cylinder, and a tube.
, the filter element comprises a filter bag and a bag cage connected to the card, the filter bag is wrapped outside the bag cage, the filter bag is processed by PTFE film, the suture of the filter bag is processed by silica gel, and the bag cage is made of galvanized steel wire.
, processing the leakage point of the original shell, checking the sealing strip of holes, and adhering firmly again.
, it also includes the modification of the control box, the control chip of the control box adopts programmable PLC, the intermediate relay is installed for socket type guide rail, the control power is generated from the inside of the control box, the outside only provides times 380/220VAC three-phase four-wire system power.
, the change-over switch of control box is set to two control modes of 'centralized-machine side', all electric devices of dust remover are controlled by control box, the power supply inlet wire and control loop of motor have respective air switch and auxiliary contact, the control box is set with ready signal lamp, fault indication signal lamp and motor status signal lamp, and the control box is set with alarm bell.
, the duster also includes secondary terminal boxes for user's connection, and the control box has external terminals separated by function and marked clearly.
Compared with the prior art, the invention has the following beneficial effects:
compared with an electrostatic dust collector, the improved bag type dust collector has the following main advantages: the efficiency is higher and the pollutant emission is lower; the maintenance cost of the components and the maintenance cost are low, and the required manpower maintenance is relatively less; when the bag dust remover is separated by the bins, the bag dust remover can be maintained on line; there is no very precise restriction requirement for the change in the properties of the inlet dust; increased ventilation can be handled; the filter media may be changed when the process conditions change.
The main advantage of the bag-type dust collector after the transformation of the invention is to reduce the emission concentration, with the stricter and stricter global air quality standard, the dust emission of the chimney becomes more and more important influencing factors when determining the dust collecting system.
In addition, the filter bag of the invention is required to be made of materials with excellent performances in strength, heat resistance, chemical substance resistance, thermal expansion, dewing resistance and the like, and a membrane-coated needled felt cloth bag subjected to waterproof and oilproof treatment is appointed to be selected; the sewing of the filter bag adopts a straight mode of longitudinal sewing lines and the number of the sewing lines is not less than three; the material of the filter bag suture is as follows: the material of the filter bag thread is the same as that of the filter material, so that the filter belt has longer service life and reduces the production cost.
The improved pulse-type bag dust collector has the advantages that the pulse-type bag dust collector can be made very compact, the overall dimensions can be diversified, the movable parts of the improved pulse-type bag dust collector are fewer, the problem of high cost caused by replacing parts of an electrostatic dust collector is solved, a pulse blowing valve in the parts can be maintained or replaced, most of the movable parts are positioned outside a bag dust collector box body, maintenance and replacement are very convenient, the filter element can be installed in a clean air chamber (the filter element is installed in the dust collector from the top) or a dust-containing chamber (the filter element is installed at the lower part of the dust collector), the traditional pulse blowing-type bag dust collector adopts a filter bag and a framework with a metal Venturi (used for guiding clean compressed air from a blowing pipe), the bag dust collector adopts a pleated filter element which combines the traditional filter bag and the framework into a filter material, the framework to replace the traditional filter bag, the pleated filter element can be used for increasing the total filter area, and the installation time of the element is further shortened by .
The improved bag-type dust collector has the beneficial effect of saving energy, and the current of the ghee is used for charging dust particles and collecting dust
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the functions of the invention clearer and easier to understand, the invention is further explained in combination with the specific embodiments:
basis of transformation
"Chongqing City Integrated atmospheric pollutants discharge Standard" DB50/418-
Technical Condition of pulse bag dust collector
Noise standards of the Industrial Enterprise factory boundaries
The production line of a certain company has 2 mills, the temperature of dust gas after grinding is about 50 ℃, each mill adopts WDJ15-2 electrostatic precipitators for ventilation and dust removal, a matched fan is Y4-68 No. 9D, and the processing capacity of a 30-30 KW. deduster is 39000m3The flow rate of the fan is 38225m3And/h, the total pressure is 1510 Pa. The dust removal system has been used for many years, the emission concentration exceeds the standard and exceeds the requirement of the standard, and the dust removal system needs to be modified to enable the emission to reach the standard.
The method includes that 1, a high-voltage transformer, a polar plate, a polar line, an anode frame, a cathode frame, a rapping system, a high-voltage power supply system and the like on the top of the electrostatic dust collector are removed firstly, the parts are removed firstly, the trouble caused by subsequent work is avoided, space is saved for the installation of the subsequent parts, an electric field chamber is changed into a filter chamber, the existing dust discharging, dust conveying system, a dust hopper, an air inlet and outlet opening and a box outer wall plate are reserved, 2, a pattern plate, a baffle plate and a gas guide system are installed, some modification may involve the modification of the pipeline and the air inlet and outlet opening to achieve the best effect if a clean air chamber is installed outside a structure, the modification is completed in the step, after dust-containing gas enters the dust collector, the filter element is distributed through a guide plate, the inlet portion is used for reducing the operation speed of the dust entering, the filter element is directly settled by utilizing the principle of gravity, so that the air flow reaching the filter element is evenly distributed to the filter element, so that the dust-containing air flow does not generate excessive wear to the filter element when the dust-containing gas is guided through the filter element, the filter element.
In the electrostatic dust collector shell, a filter chamber partition plate, a filter chamber element, an air inlet and outlet channel, a cleaning chamber, a pulse blowing system and an air supply system are additionally arranged. The electric field space is mainly used for transforming into a filter chamber, the partition plates of the chambers are mainly newly added, so that the resistance is reduced, the original inlet and outlet horns are used for transforming into an air inlet and outlet of the pulse bag type dust collector, and meanwhile, the partition plates of the air inlet and outlet are newly added, so that an air inlet and outlet channel is formed.
The air purifying chamber is divided into 8 chambers, the top of the cleaning chamber is provided with a plurality of overhauling covers, the cleaning air supply system adopts double air bags, and the air supply system comprises the air bags, a pulse valve, a cylinder, a pipe fitting and the like.
And adding a filter element, wherein the filter element consists of a filter bag and a bag cage, the gram weight of the filter bag is 500g/m2, the filter bag is subjected to PTFE membrane covering treatment, and the suture is subjected to silica gel treatment. The bag cage is made of galvanized steel wires. The filter bag is required to be made of materials with excellent strength, heat resistance, chemical substance resistance, thermal expansion resistance, dewing resistance and other performances, a membrane-coated needled felt cloth bag subjected to waterproof and oilproof treatment is appointed to be selected, and the quality guarantee is more than or equal to 2 years; sewing the filter bag: the longitudinal sewing lines of the filter bag are firm and straight and are not less than three; the material of the filter bag suture is as follows: the material of the filter bag suture is the same as that of the filter material, and when the suture different from the material of the filter material is used, tests prove that the strength, heat resistance, chemical resistance, expansion and other properties of the used suture are superior to those of the suture made of the same material as the filter material; stitch length of filter bag suture: the number of needles of the suture of the filter bag in 10cm is not less than 40 +/-5 needles; the sewing width of the filter bag is 10-20 mm, the lower limit of the thin filter material of the edge is taken, and the upper limit is taken when the overlapping sewing of the thick filter material is carried out; the limit deviation of the length size of the filter bag is +10mm, and the limit deviation of the inner diameter size is +1.5 mm; the elastic ring of the filter bag is smooth and has no burrs, and the filter bag is tightly matched with the pattern plate holes.
The leakage points found in the reconstruction of the original shell welding line are processed, the sealing strips entering the holes are bonded firmly and airtightly again, the air leakage rate of the shell is ensured to be less than or equal to 5% under normal pressure, and the filtering capacity of the bag-type dust collector can be improved by increasing the wind power in the equipment.
The control of the control box is controlled by a programmable PLC (programmable logic controller), the control box is more reliable and stable, an intermediate relay is installed by a non-Nix socket type guide rail, a wiring terminal adopts a non-Nix product, the protection grade of an electrical control box is IP54, so as to ensure the reliable operation of equipment, all control power supplies are generated from the inside, only loop 380/220VAC three-phase four-wire system power supplies are provided from the outside, the control box is provided with a 'centralized-machine side' change-over switch to select two control modes, the control range of the control box comprises all electrical equipment ordered by the dust remover, a motor of the dust remover, various protections of an electromagnetic valve are completed in the control box and comprise necessary times and a secondary loop, the control loops of the power supply inlet wire, the motor and the like in the control box are required to be provided with respective air switches and auxiliary contacts, the control box surface is provided with a 'centralized-machine side' selection switch, a machine side control switch, necessary signal lamps (such as preparation, fault indication, motor state and the like), the dust remover is provided with an alarm bell and a secondary junction box, a control terminal is used by a user, a control box is used for.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (9)
1, method for transforming electric dust collector into pulse bag type dust collector, which is characterized by comprising the following steps:
(1) removing the internal components of the electric dust collector: the dust discharging system, the dust conveying system, the dust hopper, the air inlet and outlet and the outer wall plate of the box body of the electric dust collector are reserved, polar lines, polar plates, a rapping system, a transformer, an upper frame, a lower frame and a porous plate in the shell of the electric dust collector are removed, and an electric field chamber is changed into a filtering chamber;
(2) installing a pattern plate, a baffle and a gas guide system: a pattern plate for mounting a filter element is mounted above the inside of the shell, a filter chamber partition plate, a filter chamber element, an air inlet and outlet channel, a cleaning chamber, a pulse blowing system and an air supply system are newly added in the filter chamber, the air inlet and outlet partition plate is newly added to form the air inlet and outlet channel, and an air purifying chamber is mounted outside the shell of the electric dust collector;
(3) holes, walkways and escalators are installed, wherein holes, walkways and escalators are installed according to the positions of the air purifying chamber and the air inlet and outlet channel;
(4) installing a filter element: installing a filter element on the pattern plate according to the air quantity of the pulse injection system and the air inlet and outlet channel, the temperature of the air flow and the size of the electric dust collector;
(5) installing an ash removal system: a compressed air pipeline, a pulse valve, an air bag, a blow pipe and related electrical elements of the ash removal system are installed, and the differential pressure ash removal controller is connected with the pulse valve.
2. The method for transforming electric precipitators into pulse bag precipitators as claimed in claim 1, further comprising transforming a fan comprising the steps of:
(1) raising the full pressure of the fan to above 2800 Pa;
(2) the control system of the fan is modified according to the motor parameters of the fan, so that the final pollutant emission concentration is 10mg/m3And the noise emission reaches the qualified standard.
3. The method for transforming electric precipitators into pulse bag precipitators as claimed in claim 1, wherein step (1) further comprises transforming the original inlet and outlet horns into inlet and outlet openings of the pulse bag precipitators.
4. The method for transforming electric precipitators into pulse bag type precipitators mentioned in claim 3, wherein the air supply system comprises double air bags, pulse valves, cylinders and pipes.
5. The method for transforming electric precipitators into pulse bag type precipitators as claimed in claim 3, wherein the filter elements include filter bags and bag cages attached to the card, the filter bags are wrapped outside the bag cages, the filter bags are processed by PTFE film, the suture of the filter bags is processed by silica gel, the bag cages are made of galvanized steel wires.
6. The method for transforming electric precipitators into pulse bag precipitators, which comprises the steps of treating the original shell at the leakage point, checking the sealing strip entering holes and re-bonding firmly.
7. The method for transforming electric precipitators into pulse bag precipitators as claimed in any one of claims 1 to 6 and , which further comprises transforming a control box, wherein a control chip of the control box adopts a programmable PLC, an intermediate relay is installed for a socket type guide rail, a control power supply is generated from the inside of the control box, and 380/220VAC three-phase four-wire power supply is provided from the outside.
8. The method for transforming electric dust collectors into pulse bag type dust collectors, as claimed in claim 7, wherein the switch of the control box is set to "centralized-beside" control mode, all the electric equipments of the dust collectors are controlled by the control box, the power supply inlet and the control circuit of the motor in the control box have their own air switches and have auxiliary contacts, the control box is provided with ready signal lamp, fault indication signal lamp and motor status signal lamp, and the control box is provided with alarm bell.
9. The method for transforming electric precipitators into pulse bag precipitators as claimed in claim 8, wherein the precipitator further includes secondary and secondary junction boxes for user wiring, the control box external leading terminals are divided into functional zones, and each zone is provided with different colors for differentiation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911215330.1A CN110732196A (en) | 2019-12-02 | 2019-12-02 | Method for transforming electric dust collectors into pulse bag type dust collectors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911215330.1A CN110732196A (en) | 2019-12-02 | 2019-12-02 | Method for transforming electric dust collectors into pulse bag type dust collectors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110732196A true CN110732196A (en) | 2020-01-31 |
Family
ID=69274284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911215330.1A Pending CN110732196A (en) | 2019-12-02 | 2019-12-02 | Method for transforming electric dust collectors into pulse bag type dust collectors |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110732196A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104667656A (en) * | 2015-03-09 | 2015-06-03 | 武汉科技大学 | Bag type dust collector converted based on electrostatic precipitator |
| CN204543823U (en) * | 2015-04-08 | 2015-08-12 | 武汉科技大学 | A kind of electricity with off-line ash-clearing and online replacing filter bag function changes bag dust collector |
| CN105133193A (en) * | 2015-07-21 | 2015-12-09 | 安徽省元琛环保科技有限公司 | Needle hole sealing technology of polyphenylene sulfide compound filter material |
| CN205164328U (en) * | 2015-11-10 | 2016-04-20 | 莱德尔工业纺织品制造(上海)有限公司 | Coating structure of suture department of compound high temperature resistant filter bag |
| CN108671646A (en) * | 2018-04-27 | 2018-10-19 | 安徽宸瑞节能环保科技工程有限公司 | A kind of sack cleaner using Retrofit on electrostatic precipitator |
| CN110508046A (en) * | 2019-09-11 | 2019-11-29 | 广德辉龙环保科技有限公司 | A kind of oil suction decolorization filtering bag and preparation method thereof |
-
2019
- 2019-12-02 CN CN201911215330.1A patent/CN110732196A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104667656A (en) * | 2015-03-09 | 2015-06-03 | 武汉科技大学 | Bag type dust collector converted based on electrostatic precipitator |
| CN204543823U (en) * | 2015-04-08 | 2015-08-12 | 武汉科技大学 | A kind of electricity with off-line ash-clearing and online replacing filter bag function changes bag dust collector |
| CN105133193A (en) * | 2015-07-21 | 2015-12-09 | 安徽省元琛环保科技有限公司 | Needle hole sealing technology of polyphenylene sulfide compound filter material |
| CN205164328U (en) * | 2015-11-10 | 2016-04-20 | 莱德尔工业纺织品制造(上海)有限公司 | Coating structure of suture department of compound high temperature resistant filter bag |
| CN108671646A (en) * | 2018-04-27 | 2018-10-19 | 安徽宸瑞节能环保科技工程有限公司 | A kind of sack cleaner using Retrofit on electrostatic precipitator |
| CN110508046A (en) * | 2019-09-11 | 2019-11-29 | 广德辉龙环保科技有限公司 | A kind of oil suction decolorization filtering bag and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101143296A (en) | Multifunctional cyclone plasma air processing machine | |
| CN201006047Y (en) | Multifunctional cyclone type plasma air-treatment machine | |
| CN110732196A (en) | Method for transforming electric dust collectors into pulse bag type dust collectors | |
| CN108579241A (en) | One kind is for recyclegas dedusting filter in 3D printing purification system | |
| CN101851695A (en) | Dry bag-type coal gas purifying and recycling process for oxygen-resistant converter | |
| CN113617193A (en) | Plasma tail gas treatment equipment | |
| CN111604176B (en) | Recyclable environment-friendly device and method for cyclone electrocoagulation and industrial dedusting | |
| CN115920535A (en) | Cremation machine flue gas treatment equipment and method | |
| CN217265845U (en) | Converter smelting flue gas treatment system | |
| CN203417570U (en) | Cutting chipping gas-solid separation dust collection treatment system | |
| CN213285977U (en) | Environment-friendly sintering machine flue gas dust collector | |
| CN210251546U (en) | Working environment space air purification system | |
| CN210045409U (en) | High-voltage electrostatic oil removing device | |
| CN212673860U (en) | Oxygen recovery system of anode material atmosphere furnace | |
| CN210159430U (en) | Smelting furnace tail gas purification treatment equipment | |
| CN106801938A (en) | A kind of two-way photodissociation cleaning equipment | |
| CN211098180U (en) | Industrial dust removal air purifier | |
| CN104338404A (en) | Cutting chipping gas-solid separation and dust collection treatment system | |
| CN209865667U (en) | Novel industrial smoke filter | |
| CN207786243U (en) | A kind of weldering fume purifying apparatus | |
| CN112169478A (en) | Variable gas transmission equipment for waste gas treatment and working method thereof | |
| CN219273333U (en) | Flue gas dust removal device for sintering process | |
| CN212141810U (en) | Conductive bag-type dust collector | |
| CN218276516U (en) | Novel energy-saving high-frequency excitation cabinet | |
| CN218735652U (en) | Tunnel wisdom computer lab environmental processing system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200131 |
|
| RJ01 | Rejection of invention patent application after publication |