CN101439344A - Filling method for reducing discharge of methane using wind force intensified ventilation - Google Patents
Filling method for reducing discharge of methane using wind force intensified ventilation Download PDFInfo
- Publication number
- CN101439344A CN101439344A CNA2008102077055A CN200810207705A CN101439344A CN 101439344 A CN101439344 A CN 101439344A CN A2008102077055 A CNA2008102077055 A CN A2008102077055A CN 200810207705 A CN200810207705 A CN 200810207705A CN 101439344 A CN101439344 A CN 101439344A
- Authority
- CN
- China
- Prior art keywords
- landfill
- leachate collection
- wind
- methane
- ventilation
- 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.)
- Granted
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/30—Landfill technologies aiming to mitigate methane emissions
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
A landfill method for strengthening ventilation and reducing the drainage of methane by taking advantage of wind power relates to a quasi-aerobic garbage landfill process. The landfill method is characterized in that a wind housing (1) is mounted at the tail end of a percolating liquid collecting main pipe (4), wherein, the ratio of an inlet diameter and an outlet diameter equal of the wind housing (1) ranges from to 8:1 to 4:1; a wind cap (2) is mounted at the top end of a vertical air duct (3) and rotates under double drive of external natural wind and difference between internal temperature and external temperature of a landfill body, so as to generate negative pressure and centrifugal force, continuously draw out landfill air in the air duct (3), drive the wind cap (2) at the tail end of the percolating liquid collecting main pipe (4) to continuously suck outside air into a garbage body, thereby forming a sustaining and efficient ventilating system, promoting aerobic decomposition and stability of garbage, and greatly reducing methane discharge. The method consumes no power, thereby greatly reducing the discharge of the quasi-aerobic garbage landfill methane and achieving the energy conservation and the drainage reduction. The invention has the advantages of simple process, convenient disassembly and assembly, low cost, and can be widely applied to domestic garbage landfill yards.
Description
Technical field
A kind of burying method that utilizes wind force intensified ventilation to reduce discharge of methane relates to a kind of semi-aerobic rubbish landfill process, can realize reduction of greenhouse gas discharge with burying method of the present invention.
Technical background
Methane is important greenhouse gases, and its global warming potentiality (GWP) is 23 times of carbon dioxide, accounts for 20% of global warming share.At present, the annual CH in the whole world
4About 500,000,000 tons of discharge capacity wherein has 2200-3600 to fill out the scene from rubbish for ten thousand tons, control landfill yard CH
4Discharging is the effective measures of control greenhouse effects.
Semi-aerobic rubbish landfill technology is the city house refuse treatment method of a kind of economy, maturation, and its basic structure comprises the leachate collection pipe and the wireway of perforation.The end of leachate collection pipe communicates with ambient atmosphere; Wireway one end communicates with the leachate collection pipe, and other end opening is with emission gases.Wireway lower end 2/3 perforated section is air-breathing section, and the upper end is the gas collection section for 1/3 section.When microorganism is decomposed heat that rubbish produced and causes temperature in the landfill yard to rise, the inside and outside temperature difference of landfill layer can cause thermal convection current, this moment, leachate collection pipe end as maintenance and atmosphere communicated, extraneous air just can flow in the landfill yard by the leachate collection pipe because of convection current naturally, and the aperture from the leachate collection pipe is diffused into the rubbish body, realize the local aerobic decomposition of rubbish, the landfill gas of generation is discharged into the atmosphere from wireway.
Yet, when the rubbish inside and outside temperature difference hour, autumn and winter season particularly, not only the efficient that flows into of air is low, and may cause that extraneous air pours in down a chimney from the wireway exit.At this moment, the rubbish of landfill can not get sufficient oxygen, and anaerobic fermentation produces a large amount of methane.Therefore, the discharging that wants to reduce methane must take some measures the ventilation effect of improving system.At present, generally adopt the air pump forced ventilation, still, increased power consumption and management cost.
Summary of the invention
The objective of the invention is to disclose a kind of technology pneumatic intensified ventilation that utilizes simple, with low cost and promote the burying method of methane emission reduction.This method is only utilized natural wind, need not other power and energy consumption, can improve the landfill present situation that the system air circulation is poor in the overwhelming majority time in a year, the methane generation is big.
To achieve these goals, the present invention has installed fan housing in line with the principle of energy-saving and emission-reduction at the end of leachate collection pipe, and on the top of wireway blast cap is installed.Though blast cap is all the fashion already in west American-European countries as unpowered exhaust blower, the history of existing decades, at home, along with a large amount of appearances of steel building, the use of blast cap is increasing day by day also, is used for the exhaust ventilation of commercial building and industrial enterprise more.Its principle is the air thermal convection current that utilizes wind-force and indoor/outdoor temperature-difference to cause, and promotes the turbine rotation, thereby utilizes centrifugal force and underbalance effect that indoor stale hot-air or waste gas are discharged.But be not used in the precedent of accurate aerobic landfill.The present invention designs a kind of and the supporting fan housing of blast cap by constantly test, connects a funnel-form fan housing at the aerobic loading embeading percolation liquid collecting pipe end of former standard, and fan housing is caught extraneous air and its suction is rolled onto in the leachate collection pipe.The aperture of the air of coming on the leachate collection pipe is diffused in the rubbish body, and the part garbage aerobic is decomposed, and produce the landfill gas based on carbon dioxide, and the aperture on wireway enters into wireway.Blast cap is installed in the exit, top of wireway, and under the promotion of the extraneous wind and the rubbish inside and outside temperature difference, blast cap begins rotation, under centrifugal force that produces and underbalance effect the gas in the wireway is discharged.Thereby improved the ventilation effect of accurate aerobic landfill greatly, promoted the aerobic decomposition of rubbish in the accurate aerobic landfill yard, reduced discharge of methane.Concrete technology is as follows:
The first step, special-purpose landfill unit is set in landfill yard: this landfill unit is provided with the impervious barrier identical with the landfill yard other parts, and leachate collection layer and the percolate storage pond separate with the waterpower of landfill yard other parts; Second step was provided with the grid ventilation equipment at this special use landfill unit, and the grid ventilation equipment is by the ventilation pipe network that is layed on the unit leachate collection layer, and the ventilation pipe network is made up of leachate collection main and leachate collection arm; The upper semi-circle of leachate collection main and leachate collection arm is provided with the aperture of conventional designing requirement and the aperture of pitch of holes, leachate collection main and leachate collection arm adopt dendritic distribution, every leachate collection main both sides are evenly distributed two leachate collection arms, and with the inclination angle of leachate collection main be 45～60 °; The mid point of every leachate collection main connects the vertical wireway that a roots and tops is connected with atmosphere, and vertical wireway lower end is provided with the aperture of conventional designing requirement and the through hole of pitch of holes for 2/3 section; It is characterized in that: the every terminal wind-collecting cover that connects of leachate collection main, fan housing is the funnelform plastic jacket that designs voluntarily, inlet diameter: outlet diameter=8:1～4:1; Blast cap is installed on vertical wireway top, blast cap rotates under the dual promotion of the inside and outside temperature difference of landfill body and extraneous natural wind, centrifugal force that produces and negative pressure make the gas in the vertical wireway constantly be drawn out of, the natural wind that simultaneously also makes fan housing catch constantly is rolled onto in leachate collection main and the leachate collection arm by suction, and be diffused in the rubbish body by the aperture on the leachate collection pipe thereupon, thereby improved the ventilation effect of accurate aerobic landfill greatly, promote the aerobic decomposition of rubbish in the accurate aerobic landfill yard, reduced discharge of methane.
Good effect of the present invention is:
1. because the present invention designs a kind of and supporting fan housing of blast cap according to the landfill yard different situations, therefore can utilize natural wind energy, the power that does not need other, gas in the landfill body is constantly extracted out, the negative pressure that produces in the landfill body makes fan housing constantly inhale the extraneous air of volume, has improved the efficient that the terminal air of leachate collection pipe enters the landfill body greatly, by methane oxidation is converted into carbon dioxide, greatly reduce its global warming potentiality, have significant global environment effect.
2. blast cap of the present invention has improved the instability that weather causes to system ventilation, add the cooperation of fan housing suction volume air, even make system's air under the weather of normal temperature and low temperature to continue and effectively enter, guaranteed the efficient degradation of annual rubbish, accelerate the stabilisation process of landfill yard, and significantly reduced the discharging of methane by the aerobic decomposition of rubbish.
3. that blast cap arc shaped blade of the present invention not only has is rainproof, snow, the function of anti-down draught, and need only light breeze or indoor/outdoor temperature-difference be not less than 0.5 ℃ condition, blade is just can continuous 365 days annual merrily and lightheartedly to turn round, and does not need electricity fully, highly sensitive.And wind speed is big more, and rotating speed is fast more, and ventilation efficiency is high more, and oxygen enters in the rubbish body many more, and the effect of methane emission reduction is obvious more.
4. wind-collecting cover of the present invention and blast cap are used, its ventilation has broken through the aerobic landfill technology of existing standard to the limitation that the landfill inside and outside temperature difference relies on, and has made full use of natural wind energy, has saved the energy, keep the advantage of accurate aerobic landfill non-power consumption, realized energy-saving and emission-reduction.
5. the present invention is with low cost, the equipment operation noiseless, and mounting or dismounting and maintaining are convenient, can be widely applied to household refuse landfill sites.
Description of drawings
Fig. 1 is a landfill yard grid aeration structure schematic diagram of the present invention
Fig. 2 is a cap structure schematic diagram of the present invention
Fig. 3 is the biodegradable degree curve map of the refuse landfill of the present invention and existing method of ventilation
Fig. 4 is the air quantity curve map that enters refuse landfill of the present invention and existing method of ventilation
Fig. 5 is methane and the carbon dioxide curve map that the present invention and existing method of ventilation discharge from refuse landfill
Wherein, 1-fan housing; 2-blast cap; 3-vertical air guide house steward; 4-leachate collection main; 5-leachate collection arm; 6-fixed blade plate; 7-axle; 8-arc shaped blade; 9-cylindrical shell; 10-air draft round entrance.
The specific embodiment
The present invention will be further described below in conjunction with embodiment and accompanying drawing, but embodiments of the present invention are not limited thereto.
See also accompanying drawing 1,2,3,4,5, wherein Fig. 1 has provided structural representation of the invention process.
Set up two scales earlier and be 2m * 1m * 1.5m, the accurate aerobic burying simulating device that internal structure is identical, one is the aerobic landfill structure of traditional standard, one is the burying method that is undertaken improveing on the structure by the present invention.Identical structure is: leachate collection main 4 and leachate collection arm 5 are the upper semi-circle perforated pipe, and the aperture is 12.5mm, pitch of holes 50mm.Leachate collection main 4 and leachate collection arm 5 adopt dendritic distribution, promptly adopting three calibers is 150mm leachate collection main 4, the leachate collection arm 5 that it is 100mm that every leachate collection main 4 both sides are evenly distributed two calibers, and with the inclination angle of leachate collection main 4 be 60 °.Every leachate collection main 4 terminal fan housings 1 that connect, fan housing 1 is own designed funnelform plastic jacket, inlet diameter 600mm, the outlet diameter 150mm of being.The mid point of every leachate collection main 4 connects a long 2m, and caliber is the vertical wireway 3 of 150mm, and vertical wireway 3 lower ends are installed with through hole for 2/3 section, and the aperture is 12.5mm, pitch of holes 100mm.The blast cap 2 that install on vertical wireway 3 tops is to go up the unpowered roof extract unit of DF series that Electrical Appliances Co., Ltd produces forever by Shanghai.Because the caliber of vertical wireway 3 is 150mm, so the blast cap parameter that this experiment is selected for use is: the internal diameter 150mm of the air draft round entrance 10 of blast cap 2, blast cap height 495mm, width 250mm.Blast cap air draft round entrance 10 joins with vertical wireway 3.That the arc shaped blade 8 of blast cap 2 not only has is rainproof, snow, the function of anti-down draught, and need only gentle breeze or indoor/outdoor temperature-difference be not less than 0.5 ℃ condition, blade is just can 365 days annual merrily and lightheartedly to turn round the ventilation efficiency height.In use select the exhaust outlet diameter blast cap identical with the wireway caliber.
Choose the biologic garbage in 2 years of landfill and insert the present invention of above-mentioned structure and traditional device for each 3 tons, measure the biodegradable degree BDM of rubbish, as shown in Figure 3, biodegradable degree BDM of the present invention is 15.27%, measures the biodegradable degree of the rubbish BDM under two kinds of burying methods.BDM sees Fig. 3 with the change curve of landfill time.As seen from Figure 3, the BDM of the aerobic landfill waste of standard of the present invention drops to 4.42% by 15.27% of the landfill initial stage in less than one-year age, and attenuation rate is 71.05%; And traditional only dropping to 8.45%, attenuation rate is 44.66%.And also the garbage degradation speed after the improvement is obviously fast than traditional as can be seen from the time dependent match Trendline of the biodegradable degree of rubbish.Generally, the BDM of rubbish reaches and just can think below 2% that landfill yard reaches stabilisation.Therefore, by the downward trend of this experiment, the aerobic burying method of standard of the present invention can promote the degraded of rubbish, accelerates the stabilisation process of landfill yard.
Simultaneously, also measured the air quantity in the leachate collection pipe exit that distributing position is identical in two kinds of burying methods of the present invention and tradition, and distributing position is identical under different wind speed wireway exit methane and concentration of carbon dioxide, its result sees Fig. 4 and Fig. 5 respectively.Among this figure, the environment mean wind speed is a mean wind speed in the atmosphere.As seen from the figure, wind speed is remarkable to the intake influence of the accurate aerobic burying method of modified form of the present invention, can bring up to 150L/s by 67L/s; Corresponding discharge of methane concentration can drop to 4%, and traditional accurate aerobic landfill methane concentration is all more than 10%.Therefore, the accurate aerobic burying method under the intensified ventilation condition of the present invention can significantly reduce the discharging of methane.
Claims (1)
1. burying method that utilizes wind force intensified ventilation to reduce discharge of methane, comprise the first step, special-purpose landfill unit is set in landfill yard: this landfill unit is provided with the impervious barrier identical with the landfill yard other parts, and leachate collection layer and the percolate storage pond separate with the waterpower of landfill yard other parts; Second step was provided with the grid ventilation equipment at this special use landfill unit, and the grid ventilation equipment is by the ventilation pipe network that is layed on the unit leachate collection layer, and the ventilation pipe network is made up of leachate collection main (4) and leachate collection arm (5); The upper semi-circle of leachate collection main (4) and leachate collection arm (5) is provided with the aperture of conventional designing requirement and the aperture of pitch of holes, leachate collection main (4) and leachate collection arm (5) adopt dendritic distribution, every leachate collection main (4) both sides are evenly distributed two leachate collection arms (5), and with the inclination angle of leachate collection main (4) be 60 °; The mid point of every leachate collection main (4) connects the vertical wireway (3) that a roots and tops is connected with atmosphere, and vertical wireway (3) lower end is provided with the aperture of conventional designing requirement and the through hole of pitch of holes for 2/3 section; It is characterized in that: the terminal wind-collecting cover (1) that connects of every leachate collection main (4), fan housing (1) is the funnelform plastic jacket that designs voluntarily, inlet diameter: outlet diameter=8:1～4:1; Blast cap (2) is installed on vertical wireway (3) top, blast cap (2) is in the landfill body, the dual promotion of the outer temperature difference and extraneous natural wind is rotation down, centrifugal force that produces and negative pressure make the gas in the vertical wireway (3) constantly be drawn out of, the natural wind that simultaneously also makes fan housing (1) catch constantly is rolled onto in leachate collection main (4) and the leachate collection arm (5) by suction, and be diffused in the rubbish body by the aperture on the leachate collection pipe thereupon, thereby improved the ventilation effect of accurate aerobic landfill greatly, promote the aerobic decomposition of rubbish in the accurate aerobic landfill yard, reduced discharge of methane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102077055A CN101439344B (en) | 2008-12-25 | 2008-12-25 | Filling method for reducing discharge of methane using wind force intensified ventilation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102077055A CN101439344B (en) | 2008-12-25 | 2008-12-25 | Filling method for reducing discharge of methane using wind force intensified ventilation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101439344A true CN101439344A (en) | 2009-05-27 |
| CN101439344B CN101439344B (en) | 2010-07-14 |
Family
ID=40724027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008102077055A Expired - Fee Related CN101439344B (en) | 2008-12-25 | 2008-12-25 | Filling method for reducing discharge of methane using wind force intensified ventilation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101439344B (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101890422A (en) * | 2010-04-16 | 2010-11-24 | 北京永新环保有限公司 | Method for determining diameter of vertical gas guide tube in quasi-aerobic refuse landfill system |
| CN101899348A (en) * | 2010-06-29 | 2010-12-01 | 同济大学 | Quick biological drying method for household garbage |
| CN101947534A (en) * | 2010-06-29 | 2011-01-19 | 同济大学 | Hydrolysis-aerobiosis two-section biological drying method for household garbage |
| CN102350212A (en) * | 2009-08-06 | 2012-02-15 | 清华大学 | Self-oxygenating covering layer device used for greenhouse gas emission reduction for household garbage landfill site |
| CN102513327A (en) * | 2011-12-30 | 2012-06-27 | 清华大学 | Semi-aerobic landfill device for emitting greenhouse gases of refuse landfill site and application |
| CN101613657B (en) * | 2009-08-06 | 2012-07-18 | 清华大学 | Covering layer automatic oxygenation system for reducing emission of greenhouse gas of household garbage landfill site |
| CN104759442B (en) * | 2015-03-22 | 2016-06-15 | 贵州圣坪瑞环保科技有限公司 | A kind of rubbish Large Copacity heap buried method |
| CN106111655A (en) * | 2016-07-11 | 2016-11-16 | 中国环境科学研究院 | The methane control method of one way of life rubbish quasi-aerobic landfill |
| CN107088572A (en) * | 2017-04-21 | 2017-08-25 | 杭州科晟能源技术有限公司 | A kind of rubbish mesopilous organisms film drying method and desiccation apparatus |
| CN109731883A (en) * | 2019-02-12 | 2019-05-10 | 上海交通大学 | A kind of refuse landfill vapor phase contaminants original position reduction system based on intercal type functional layer |
| CN111705842A (en) * | 2020-05-18 | 2020-09-25 | 黎忠琴 | Efficient anti-seepage method for landfill for domestic garbage treatment |
-
2008
- 2008-12-25 CN CN2008102077055A patent/CN101439344B/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101613657B (en) * | 2009-08-06 | 2012-07-18 | 清华大学 | Covering layer automatic oxygenation system for reducing emission of greenhouse gas of household garbage landfill site |
| CN102350212A (en) * | 2009-08-06 | 2012-02-15 | 清华大学 | Self-oxygenating covering layer device used for greenhouse gas emission reduction for household garbage landfill site |
| CN102350212B (en) * | 2009-08-06 | 2013-08-14 | 清华大学 | Self-oxygenating covering layer device used for greenhouse gas emission reduction for household garbage landfill site |
| CN101890422A (en) * | 2010-04-16 | 2010-11-24 | 北京永新环保有限公司 | Method for determining diameter of vertical gas guide tube in quasi-aerobic refuse landfill system |
| CN101890422B (en) * | 2010-04-16 | 2012-05-30 | 北京永新环保有限公司 | Method for determining diameter of vertical gas guide tube in quasi-aerobic refuse landfill system |
| CN101899348A (en) * | 2010-06-29 | 2010-12-01 | 同济大学 | Quick biological drying method for household garbage |
| CN101947534A (en) * | 2010-06-29 | 2011-01-19 | 同济大学 | Hydrolysis-aerobiosis two-section biological drying method for household garbage |
| CN102513327A (en) * | 2011-12-30 | 2012-06-27 | 清华大学 | Semi-aerobic landfill device for emitting greenhouse gases of refuse landfill site and application |
| CN104759442B (en) * | 2015-03-22 | 2016-06-15 | 贵州圣坪瑞环保科技有限公司 | A kind of rubbish Large Copacity heap buried method |
| CN106111655A (en) * | 2016-07-11 | 2016-11-16 | 中国环境科学研究院 | The methane control method of one way of life rubbish quasi-aerobic landfill |
| CN107088572A (en) * | 2017-04-21 | 2017-08-25 | 杭州科晟能源技术有限公司 | A kind of rubbish mesopilous organisms film drying method and desiccation apparatus |
| CN107088572B (en) * | 2017-04-21 | 2019-06-18 | 杭州科晟能源技术有限公司 | A kind of rubbish mesopilous organisms film drying method and desiccation apparatus |
| CN109731883A (en) * | 2019-02-12 | 2019-05-10 | 上海交通大学 | A kind of refuse landfill vapor phase contaminants original position reduction system based on intercal type functional layer |
| CN111705842A (en) * | 2020-05-18 | 2020-09-25 | 黎忠琴 | Efficient anti-seepage method for landfill for domestic garbage treatment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101439344B (en) | 2010-07-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101439344B (en) | Filling method for reducing discharge of methane using wind force intensified ventilation | |
| CN203934432U (en) | A kind of wind light mutual complementing air condensed water automatic irrigation device | |
| CN204301245U (en) | The novel energy-conserving ventilation device of wind-drive | |
| CA2831835A1 (en) | Method and device for providing heat and carbon dioxide to vegetables and/or algae using power station flue gas | |
| CN203845963U (en) | Static aerobic composting device | |
| CN207018144U (en) | Round-the-clock wind/light energy and air force energy multiple integration wind-tunnel electricity generation system | |
| CN101746938A (en) | Residential community excrement and kitchen waste collection and treatment and combined cold heat and power supply method | |
| CN111336521A (en) | Ventilation heating system and method for waste incineration power generation | |
| CN101196171A (en) | Inner tunnel type pressure expanding flow concentrating combined bidirectional wind-driven generator for buildings | |
| CN204999916U (en) | Horizontal organic good oxygen biological fermentation equipment | |
| CN204272803U (en) | A kind of green house | |
| CN210641830U (en) | Greenhouse system used under large temperature difference day and night and limited sunshine time | |
| CN201474861U (en) | Axial-flow through-flow impeller integrated high building courtyard wind power generation system | |
| CN104791997B (en) | A kind of plant granule fuel burner | |
| CN101532470A (en) | Method for power generation by utilizing chimney effect | |
| CN202489019U (en) | Closed recycling system for materials and energy in greenhouse | |
| CN201319778Y (en) | Heat accumulation type solar greenhouse | |
| CN2297560Y (en) | Wind-driven generator with hot rotating pipeline | |
| CN203892120U (en) | Wind pipe power generating device | |
| CN201624134U (en) | Solar heat collecting device for tobacco leaf flue-curing barn | |
| CN212252619U (en) | Ventilation heating system for waste incineration power generation | |
| CN201089769Y (en) | Dry and wet two purpose solar methane generator | |
| CN111548833B (en) | Steam-water separation device for fully separating liquid from gas | |
| CN202789333U (en) | Power station device capable of generating hot airflow by puelia | |
| CN214891681U (en) | Residential ventilation system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100714 Termination date: 20121225 |