CN203771417U - Domestic garbage gasification, combustion treatment and heat utilization device - Google Patents

Domestic garbage gasification, combustion treatment and heat utilization device Download PDF

Info

Publication number
CN203771417U
CN203771417U CN201420168898.9U CN201420168898U CN203771417U CN 203771417 U CN203771417 U CN 203771417U CN 201420168898 U CN201420168898 U CN 201420168898U CN 203771417 U CN203771417 U CN 203771417U
Authority
CN
China
Prior art keywords
gasification
domestic garbage
pipe
heat
baking room
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.)
Withdrawn - After Issue
Application number
CN201420168898.9U
Other languages
Chinese (zh)
Inventor
刘曜
陈庆平
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HUNAN YAOXIANG SCIENCE & TECHNOLOGY Co Ltd
Original Assignee
HUNAN YAOXIANG SCIENCE & TECHNOLOGY Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by HUNAN YAOXIANG SCIENCE & TECHNOLOGY Co Ltd filed Critical HUNAN YAOXIANG SCIENCE & TECHNOLOGY Co Ltd
Priority to CN201420168898.9U priority Critical patent/CN203771417U/en
Application granted granted Critical
Publication of CN203771417U publication Critical patent/CN203771417U/en
Anticipated expiration legal-status Critical
Withdrawn - After Issue legal-status Critical Current

Links

Abstract

The utility model relates to a domestic garbage gasification, combustion treatment and heat utilization device comprising a gasification furnace, a combustion mechanism and a drying mechanism. A gas distribution and dust storage box is arranged at the bottom in a furnace body of the gasification furnace, the drying mechanism comprises a first-stage drying room and a second-stage drying room, the first-stage drying room and the second-stage drying room are arranged side by side, the drying mechanism is further provided with a cooling tube sequentially penetrating through the first-stage drying room and the second-stage drying room, one end of the cooling tube is connected with an exhaust port of a combustor, the other end of the cooling tube is provided with a flue gas collecting box, the upper portion of the first-stage drying room is provided with a drying room exhaust fan and is provided with an air inlet pipe connected with the drying room exhaust fan, and one end of the air inlet pipe is arranged in an inner cylinder of the gas distribution and dust storage box. The domestic garbage gasification, combustion treatment and heat utilization device can prevent sewage, tar, flue gas and odor from being generated in the domestic garbage treatment process, solves the problems of safety, slagging in the furnace and continuous and stable operation in the gasification process and enables flammable gas generated after domestic garbage gasification to be fully combusted, and heat generated after combustion can be fully used.

Description

One way of life refuse gasification is processed and heat-energy utilizing device with burning
Technical field
The utility model relates to a kind of refuse gasification treating apparatus, is specially one way of life refuse gasification and processes and heat-energy utilizing device with burning.
Background technology
House refuse has formed threat to human survival, and the processing of Municipal Solid Waste in China has caused government's great attention, and conventional processing method is landfill and burning.But the processing of Chinese countryside house refuse or a weak link, be mainly subject to the restriction of technology and fund.At present, domestic rubbish disposal conventional method in Chinese countryside has landfill, stacking and burning: (1) landfill: some villages, township, town can be selected partially to keep away place and set up refuse landfill, in after centralized collection of garbage, landfill enters.The method can take a lot of land resource, and the foul smell that garbage loading embeading produces also can contaminated air and affected environment, and its penetrating fluid can pollute periphery underground water.(2) stack: the method be by dumping by road, under limit, river course, bridge, by pond, in gully etc., this hazard ratio landfill to environment is larger.(3) burn: waste incineration national rural area is generally promoted and used.Owing to lacking of capital, general simple and easy burning bucket or the simple and easy burning pond of adopting of Chinese countryside consumer waste incineration at present, method of operating is that rubbish is inserted in bucket (pond), the burning of lighting a fire from below, and the method for this disposal of refuse can produce a large amount of harmful poisonous flue gas and particle.Incinerator has been set up in the place that economic situation is good, and by central incineration, its harm is slightly less than simple and easy burning.All there is the realistic problem that has a strong impact on environment and waste heat resource in the method for above-mentioned various disposals of refuse.
Summary of the invention
The purpose of this utility model is, for the deficiencies in the prior art, provide one way of life refuse gasification and burning to process and heat-energy utilizing device, the problems such as security in domestic garbage gasification process, ash erosion, continuous and steady operation are solved, also the combustible gas producing after domestic garbage gasification fully can be burnt, and the heat energy producing after burning utilizes completely.
The technical solution of the utility model is, one way of life refuse gasification is processed and heat-energy utilizing device with burning, comprise gasification furnace and combustion mechanism, gasification furnace furnace wall is provided with the passage being communicated with combustion mechanism, described combustion mechanism comprises combustor, bottom in gasification furnace body of heater is provided with distribution ash storage box, distribution ash storage box comprises ash storage box and is placed in ash storage box top inner core, and install at the top of inner core can pull pneumatic panel, on described pneumatic panel, be evenly provided with multiple air distribution holes, and between inner core and ash storage box, install can pull dust control plate; Described combustion mechanism comprises the fuel gas exhaust pipe that one end is communicated with passage, and the other end of fuel gas exhaust pipe and one end of Gas Pipe are connected, and the other end of Gas Pipe is installed gas nozzle and passed in combustor; This gasification treatment device is also provided with drying mechanism, described drying mechanism comprises one-level baking room, the secondary baking room installed side by side, in one-level baking room and secondary baking room, be equipped with and dry backing strap plate, described drying mechanism is also provided with the radiating tube through one-level baking room and secondary baking room in turn, described radiating tube is placed in the below of drying backing strap plate, one end of radiating tube is connected with the exhaust outlet of combustor, and the other end of radiating tube is provided with fume centralized case; The top of described one-level baking room is provided with baking room exhaust fan, and is provided with air inlet pipe and is connected with baking room exhaust fan, and one end of air inlet pipe passes into the inner core of distribution ash storage box.
The baking room of drying mechanism divides secondary, and first order baking room is used for drying rubbish, and second level baking room is used for drying agricultural byproducts and sheet, quilt, clothing etc., can make full use of like this heat energy producing after refuse gasification fuel gas buring.The water vapour of discharging in rubbish baking room is blown in gasification furnace as oxidant by exhaust fan and air blast.Like this, both eliminated gas peculiar smell and protected environment, having heated again oxidant, having reached the dual purpose that improves fuel gases calorific value and reduce discharged nitrous oxides.
Described drying mechanism is also provided with condensate draining, and described fume centralized case is communicated with the condensed-water collection pipe passing in condensate draining, and fume centralized case is also connected with chimney through air-introduced machine.
The top of described gasification furnace bell is pinnacle, between bell and gasification furnace shaft, seals by sealed cistern.
The inner side, middle part of described gasification furnace body of heater is provided with inner bag, and this inner bag and furnace wall are combined to form the expansion box that Open Side Down, and described passage is located on the furnace wall corresponding with expansion box.Fuel gas exhaust pipe is derived combustion gas from expansion box.
In described gasification furnace body of heater, be provided with rotating material-pressing bar, multiple round steel branches are welded in compressing rod middle and lower part, and compressing rod moves up and down and can stir and compacting material.
Described fuel gas exhaust pipe top is provided with pressure release access cover, between access cover and fuel gas exhaust pipe, seals by tank.This access cover seals with tank, while can be used for causing gasification furnace internal gas pressure excessive because of gas pipeline obstruction, can automatically open pressure release and prevent exploding, meanwhile, can be used for clearing up the accumulation such as plastics Huang or tar in gas pipeline.
Described combustor comprises the secondary aid distributing pipe that is located at combustor body and burns ignitron, be arranged on combustor organism bottom near helping of gas nozzle one end, the secondary wind distributing hole that is located at combustor body side and end face.Help burning ignitron to be positioned at combustor bottom, use sealing of lid.Secondary wind distributing hole is divided into several groups of (one group of combustor bottom, one to three group of side), bottom wind distributing hole tilts to same direction, side wind distributing hole and combustor shell are oriented in a tangential direction, can ensure that like this combustion gas forms eddy current and fully burning of rotation in combustor, and prolonging burning time, to reach over-emitting black exhaust not, free from extraneous odour, effect without dust emission.
Described radiating tube is tuberculated pipe.
Described gasification furnace body of heater is divided into upper, middle and lower segment, between adjacent segment body of heater, connects by flange.
Described gasification furnace lower portion of furnace body is provided with electronic ignition pipe and break pipe.
In domestic garbage gasification and burning processing drying course, must adopt rational operation technological process could dispose well rubbish, its operation technological process is as follows:
1) overhauled gasification furnace 8, emphasis is: whether sealing, pneumatic panel 11 and the dust control plate 16 of bell 1 and pressure release access cover 21 puts in place, the connection of flange 4 and the sealing of sealing, access door 13 and ash-draining gate 15 and gas pipeline 20,22 whether unimpeded etc.;
2) rubbish of drying is put into gasification furnace, shake rotating material-pressing bar 6 compacting materials.If use first, should first a small amount of living beings broken material be joined on the pneumatic panel 11 of gasification furnace bottom, then add in the above through roughly selecting and the material such as dry house refuse;
3) insert electronic ignition rod by electronic ignition hole 18, switch on power;
4) be blown into air by air inlet pipe 17, material initial burning after 1 minute, gasification reaction starts.Turn off air blast 10, exit electronic ignition rod, by electronic ignition hole 18 good seals.
5) liquefied gas tank flame gun is lighted, and from helping burning ignitron 23 to stretch in combustor 24, the gas of flame gun ejection burns near nozzle 26, the higher flue gas assistant of moisture vapor that the gasification initial stage produces can be burnt;
6) after a few minutes, combustion gas normal combustion, progressively regulates the firepower of flame gun, finally turns off flame gun, and flame gun is burnt to ignitron 23 and removes from helping.Open secondary wind inleting tube 27 blower fans, adjust secondary air amount, refuse gasification starts and enters normal condition;
7) gasification furnace moves after a period of time continuously, can find that combusting firepower diminishes and has light cigarettes to occur, at this moment must rotate rotating material-pressing bar 6, and raw material, toward pressing down, just can be extended to the refuse gasification time;
8) gasification furnace moves continuously 4 ~ 8 hours and can turn off power supply and stops gasification, after blowing out about 1 hour, first poke by the effective iron rod of break the clinker that gasification produces, pull out again pneumatic panel 11, allow lime-ash fall on dust control plate 16, advance pneumatic panel, pull-out dust control plate, allows lime-ash drop in ash storage box 14 again; If gasification furnace bottom still has clinker not discharge, can be by the artificial clinker of discharging of access door 13.If the ash content of coal of material is less, needn't ash discharge, only need suitable rotating material-pressing bar;
9) after ash discharge finishes, pneumatic panel 11 is resetted, shut access door 13 rotating material-pressing bar 16 by material compacting, then open bell 1 and add material, open pressure release access cover 21 simultaneously, check whether gas pipeline 20 stops up;
10) if the ember in gasification furnace 8 does not extinguish, repeat 4) ~ 9) operation can start next refuse gasification processing procedure, if the ember in gasification furnace extinguishes, repeat 3) ~ 9) operating process;
11) combustion gas that gasification furnace produces is gathered in expansion box 7, leads to combustor 24, and burn in combustor by fuel gas exhaust pipe 22, and secondary rotating air distribution 27 can increase oxygen supply, makes combustion gas fully completing combustion in combustor;
12) high-temperature flue gas producing after burning flows to respectively each tuberculated pipe 30 by flue gas shunting case 29, then enters fume centralized case 41, under air-introduced machine 35 effects, discharges by chimney 33.High-temperature flue gas turns cold in the interior mobile time heat radiation of radiating tube 30, and water vapour is condensed into the globule and flows to condensate draining 34 by condensed-water collection pipe 32;
13) heat accumulation of distributing by fin 31, in baking room, raises temperature in room; One-level baking room 37 is for drying rubbish, dumping is being dried on backing strap plate 40, the water vapour producing when dry is discharged by ventilating fan 36 and air blast 10 is incorporated in gasification furnace, as oxidant, and the impact of the gas with foreign flavor of generation on environment can remove like this rubbish and dried time.Secondary baking room 38 is mainly used in drying agricultural byproducts or sheet, quilt, cereal crops etc., and the water vapour being produced by drying article is discharged to by exhaust fan in the air.
This device can prevent sewage, tar, flue gas, peculiar smell in domestic rubbish disposal process, the problems such as the security in gasification, ash erosion, continuous and steady operation are solved, also the combustible gas producing after domestic garbage gasification fully can be burnt, and the heat energy producing after burning utilizes completely in addition, such as for drying the cereal crops such as clothing and paddy, wheat such as agricultural byproducts, sheet, leather.
Brief description of the drawings
Fig. 1 is the structural representation of a kind of embodiment of the utility model.
Detailed description of the invention
As shown in Figure 1, one way of life refuse gasification is processed and heat-energy utilizing device with burning, comprise gasification furnace 8 and combustion mechanism, gasification furnace 8 is supported by converter body support pin 9, gasification furnace furnace wall is provided with the passage being communicated with combustion mechanism, described combustion mechanism comprises combustor 24, bottom in gasification furnace body of heater is provided with distribution ash storage box, distribution ash storage box comprises ash storage box 14 and is placed in the inner core 12 of ash storage box 14 tops, and install at the top of inner core 12 can pull pneumatic panel 11, on described pneumatic panel 11, be evenly provided with multiple air distribution holes, and between inner core 12 and ash storage box 14, install can pull dust control plate 16, described combustion mechanism comprises the fuel gas exhaust pipe 20 that one end is communicated with passage, and the other end of fuel gas exhaust pipe 20 is connected with one end of Gas Pipe 22, the other end of Gas Pipe 22 is installed gas nozzle 26 and is passed in combustor 24, fuel gas exhaust pipe 20 tops are provided with pressure release access cover 21, between access cover 21 and fuel gas exhaust pipe 20, seal by tank, this gasification treatment device is also provided with drying mechanism, described drying mechanism comprises the one-level baking room 37 of installing side by side, secondary baking room 38, in one-level baking room 37 and secondary baking room 38, be equipped with and dry backing strap plate 40, in one-level baking room 37 and secondary baking room 38, be equipped with and dry door 39, described drying mechanism is also provided with the radiating tube 30 through one-level baking room 37 and secondary baking room 38 in turn, described radiating tube 30 is placed in the below of drying backing strap plate 40, one end of radiating tube 30 is connected with the exhaust outlet of combustor 24, and the other end of radiating tube 30 is provided with fume centralized case 41, the top of described one-level baking room 37 is provided with baking room exhaust fan 36, and is provided with air inlet pipe 17 and is connected with baking room exhaust fan 36, air blast 10 is installed in air inlet pipe 17, and one end of air inlet pipe 17 passes into the inner core 12 of distribution ash storage box, gasification furnace lower portion of furnace body is provided with electronic ignition pipe 18 and break pipe 19.
Drying mechanism is also provided with condensate draining 34, and described fume centralized case 41 is communicated with the condensed-water collection pipe 32 passing in condensate draining 34, and fume centralized case 41 is also connected with chimney 33 through air-introduced machine 35.
The top of gasification furnace bell 1 is pinnacle, seal, and gasification furnace bell 1 is provided with Fixed hinge 3 with the junction of gasification furnace shaft between bell 1 and gasification furnace shaft by sealed cistern 2.
The inner side, middle part of gasification furnace body of heater is provided with inner bag 5, and this inner bag 5 is combined to form with furnace wall the expansion box 7 that Open Side Down, and described passage is located on the furnace wall corresponding with expansion box 7.
In gasification furnace body of heater, be provided with rotating material-pressing bar 6.
Combustor comprises the secondary aid distributing pipe 27 that is located at combustor body and burns ignitron 23, be arranged on combustor organism bottom near helping of gas nozzle one end, the secondary wind distributing hole 25 that is located at combustor body side and end face, and combustor body inwall is provided with refractory material 28.
Gasification furnace body of heater is divided into upper, middle and lower segment, between adjacent segment body of heater, connects by flange 4.
Radiating tube 30 is the tuberculated pipe with fin 31.

Claims (10)

1. one way of life refuse gasification is processed and heat-energy utilizing device with burning, comprise gasification furnace (8) and combustion mechanism, gasification furnace furnace wall is provided with the passage being communicated with combustion mechanism, described combustion mechanism comprises combustor (24), it is characterized in that, bottom in gasification furnace body of heater is provided with distribution ash storage box, distribution ash storage box comprises ash storage box (14) and is placed in the inner core (12) of ash storage box (14) top, and install at the top of inner core (12) can pull pneumatic panel (11), described pneumatic panel is evenly provided with multiple air distribution holes on (11), and between inner core (12) and ash storage box (14), install can pull dust control plate (16), described combustion mechanism comprises the fuel gas exhaust pipe (20) that one end is communicated with passage, and the other end of fuel gas exhaust pipe (20) is connected with one end of Gas Pipe (22), the other end of Gas Pipe (22) is installed gas nozzle (26) and is passed in combustor (24), this gasification treatment device is also provided with drying mechanism, described drying mechanism comprises the one-level baking room (37) of installing side by side, secondary baking room (38), in one-level baking room (37) and secondary baking room (38), be equipped with and dry backing strap plate (40), described drying mechanism is also provided with the radiating tube (30) through one-level baking room (37) and secondary baking room (38) in turn, described radiating tube (30) is placed in the below of drying backing strap plate (40), one end of radiating tube (30) is connected with the exhaust outlet of combustor (24), and the other end of radiating tube (30) is provided with fume centralized case (41), the top of described one-level baking room (37) is provided with baking room exhaust fan (36), and is provided with air inlet pipe (17) and is connected with baking room exhaust fan (36), and one end of air inlet pipe (17) passes into the inner core (12) of distribution ash storage box.
2. domestic garbage gasification is processed and heat-energy utilizing device with burning according to claim 1, it is characterized in that, described drying mechanism is also provided with condensate draining (34), described fume centralized case (41) is communicated with the condensed-water collection pipe (32) passing in condensate draining (34), and fume centralized case (41) is also connected with chimney (33) through air-introduced machine (35).
3. domestic garbage gasification is processed and heat-energy utilizing device with burning according to claim 1, it is characterized in that, the top of described gasification furnace bell (1) is pinnacle, between bell (1) and gasification furnace shaft, seals by sealed cistern (2).
4. domestic garbage gasification is processed and heat-energy utilizing device with burning according to claim 1, it is characterized in that, the inner side, middle part of described gasification furnace body of heater is provided with inner bag (5), this inner bag (5) is combined to form the expansion box that Open Side Down (7) with furnace wall, and described passage is located on the furnace wall corresponding with expansion box (7).
5. domestic garbage gasification is processed and heat-energy utilizing device with burning according to claim 1, it is characterized in that, is provided with rotating material-pressing bar (6) in described gasification furnace body of heater.
6. domestic garbage gasification is processed and heat-energy utilizing device with burning according to claim 1, it is characterized in that, described fuel gas exhaust pipe (20) top is provided with pressure release access cover (21), between access cover (21) and fuel gas exhaust pipe (20), seals by tank.
7. domestic garbage gasification is processed and heat-energy utilizing device with burning according to claim 1, it is characterized in that, described combustor comprises the secondary aid distributing pipe (27) that is located at combustor body and burns ignitron (23), be arranged on combustor organism bottom near helping of gas nozzle one end, the secondary wind distributing hole (25) that is located at combustor body side and end face.
8. domestic garbage gasification is processed and heat-energy utilizing device with burning according to claim 1, it is characterized in that, described gasification furnace body of heater is divided into upper, middle and lower segment, between adjacent segment body of heater, connects by flange (4).
9. domestic garbage gasification is processed and heat-energy utilizing device with burning according to claim 1, it is characterized in that, described gasification furnace lower portion of furnace body is provided with electronic ignition pipe (18) and break pipe (19).
10. process and heat-energy utilizing device according to the described domestic garbage gasification of one of claim 1-9 and burning, it is characterized in that, described radiating tube (30) is tuberculated pipe.
CN201420168898.9U 2014-04-09 2014-04-09 Domestic garbage gasification, combustion treatment and heat utilization device Withdrawn - After Issue CN203771417U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420168898.9U CN203771417U (en) 2014-04-09 2014-04-09 Domestic garbage gasification, combustion treatment and heat utilization device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420168898.9U CN203771417U (en) 2014-04-09 2014-04-09 Domestic garbage gasification, combustion treatment and heat utilization device

Publications (1)

Publication Number Publication Date
CN203771417U true CN203771417U (en) 2014-08-13

Family

ID=51288606

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201420168898.9U Withdrawn - After Issue CN203771417U (en) 2014-04-09 2014-04-09 Domestic garbage gasification, combustion treatment and heat utilization device

Country Status (1)

Country Link
CN (1) CN203771417U (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103939911A (en) * 2014-04-09 2014-07-23 湖南鹞翔科技有限公司 Household refuse gasification and combustion and heat energy utilization device
CN105042589A (en) * 2015-08-29 2015-11-11 湖南普丝环保能源有限公司 Rubbish gasification processing device and processing method thereof
CN106016277A (en) * 2016-07-05 2016-10-12 湖南新喜环保能源科技有限公司 Tail gas treatment system of garbage gasifier equipment

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103939911A (en) * 2014-04-09 2014-07-23 湖南鹞翔科技有限公司 Household refuse gasification and combustion and heat energy utilization device
CN103939911B (en) * 2014-04-09 2016-03-09 湖南鹞翔科技有限公司 One way of life refuse gasification processes and heat-energy utilizing device with burning
CN105042589A (en) * 2015-08-29 2015-11-11 湖南普丝环保能源有限公司 Rubbish gasification processing device and processing method thereof
CN106016277A (en) * 2016-07-05 2016-10-12 湖南新喜环保能源科技有限公司 Tail gas treatment system of garbage gasifier equipment
CN106016277B (en) * 2016-07-05 2018-07-13 湖南新喜环保能源科技有限公司 Refuse gasification furnace apparatus exhaust treatment system

Similar Documents

Publication Publication Date Title
CN103939911B (en) One way of life refuse gasification processes and heat-energy utilizing device with burning
CN204100254U (en) Incinerator
CN104140851A (en) Vertical negative-pressure garbage destructive-distillation incinerator without emission of dioxin or waste gas
CN204388069U (en) A kind of solid waste pyrolysis formula fusion and gasification treating apparatus
CN105737164A (en) Garbage pyrolysis gasification furnace
CN103267293B (en) A kind of refuse gasification boiler
CN208398087U (en) A kind of domestic garbage pyrolysis innoxious burning equipment
CN205860028U (en) A kind of garbage pyrolysis furnace
CN203771417U (en) Domestic garbage gasification, combustion treatment and heat utilization device
CN100432532C (en) Combined incineration treatment method for refuse and special vertical oxygen-enriched continuous incinerator
CN207514917U (en) Waste incineration and generating electricity device
CN105042589A (en) Rubbish gasification processing device and processing method thereof
CN106122974A (en) A kind of garbage pyrolysis furnace
CN105465794A (en) Garbage incinerator
CN110486728A (en) A kind of novel household garbage pyrolyzing, gasifying and incinerating system
CN206504333U (en) Improved innoxious waste incinerator
CN106247341B (en) Half gasification waste incinerator
CN105066136A (en) Combined incineration device for rotary furnace fire grate
CN204943498U (en) High temperature garbage gasification power generation system
CN101592335B (en) Tobacco stem waste gasification system device and production technology thereof
CN106958821A (en) A kind of two method domestic garbage pyrolysis gasification ovens of recycling
CN207162549U (en) A kind of refuse pyrolysis gasification combustion furnace
CN203323134U (en) Rubbish gasification furnace
CN108506943A (en) A kind of coal fired boiler of power plant burns the method and system of the waste containing biomass
CN203082892U (en) Rural garbage harmless treatment device

Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
AV01 Patent right actively abandoned

Granted publication date: 20140813

Effective date of abandoning: 20160309

C25 Abandonment of patent right or utility model to avoid double patenting