CN204319961U - A kind of paint spray booth waste gas purification electricity generation system - Google Patents
A kind of paint spray booth waste gas purification electricity generation system Download PDFInfo
- Publication number
- CN204319961U CN204319961U CN201420767064.XU CN201420767064U CN204319961U CN 204319961 U CN204319961 U CN 204319961U CN 201420767064 U CN201420767064 U CN 201420767064U CN 204319961 U CN204319961 U CN 204319961U
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- gas
- electricity generation
- waste gas
- paint spray
- spray booth
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/12—Heat utilisation in combustion or incineration of waste
Abstract
The utility model provides a kind of paint spray booth waste gas purification electricity generation system, comprise pre-processing module, exhaust-gas treatment electricity generation module and fume treatment module, the waste gas that described paint spray booth produces is by being transported to exhaust-gas treatment electricity generation module after pre-processing module process, the delivery of electrical energy that described exhaust-gas treatment electricity generation module produces is to electrical network, the flue gas produced is by fume treatment resume module, and its hot-air produced transfers to drying chamber and uses.The energy generating utilizing burning to produce, and the flue gas of discharge is delivered to after treatment paint spray booth's waste gas purification electricity generation system of drying chamber use.The utility model solves the technical problem of the aspects such as paint spray booth's waste gas purification apparatus wide usage is poor, and economy is not good enough, and technology upgrading transformation property is poor, and maintenance of clean-up is inconvenient simultaneously.
Description
Technical field
The utility model relates to a kind of paint spray booth waste gas purification electricity generation system, is applicable to automobile coating production line apparatus field.
Background technology
The large-wind-volume low-concentration VOC waste gas that Painting Shop paint spray booth produces generally at high temperature carries out decomposition oxidation processes after adsorption runner system is concentrated.When adopting direct combustion method process, fuel consumption is comparatively large, and the heat part discharged in combustion process is for preheating concentrated waste gas, and the flue gas of discharge produces hot water, hot-air by heat exchanger, and the rate of recovery is not high, reclaims product recycling scope little.When adopting regenerative combustion furnace process, the heat discharged in combustion process is mainly used in preheating VOC and concentrates waste gas, and therefore Fuel Consumption is low, and delivery temperature, generally at 140 DEG C ~ 200 DEG C, utilizes the effect of heat exchanger Mist heat recovering undesirable.All there is following shortcoming in above-mentioned two kinds of methods: 1. the heat energy major part that burning produces is used for preheating of concentrated waste gas.2. flue gas waste heat recovery product is hot water, hot-air, and the scope of application is little, and conveying need set up special pipeline.3. the flue gas after heat exchange utilizes directly discharge to enter air without secondary recovery.
Summary of the invention
The technical problem that the utility model solves is, the VOC waste gas of discharging with combustion method process paint spray booth, and the heat discharged in combustion process is for generating electricity for Painting Shop, and the high-temperature flue gas of discharge is provided to drying chamber after treatment and uses.
In order to solve the problems of the technologies described above, the technical scheme that the utility model adopts is:
A kind of paint spray booth waste gas purification electricity generation system, comprise pre-processing module, exhaust-gas treatment electricity generation module and fume treatment module, the waste gas that described paint spray booth produces is by being transported to exhaust-gas treatment electricity generation module after pre-processing module process, the delivery of electrical energy that described exhaust-gas treatment electricity generation module produces is to electrical network, the flue gas produced is by fume treatment resume module, and its hot-air produced transfers to drying chamber and uses.
Above-mentioned pre-processing module comprises exhaust gas fan, filter, adsorption runner, the waste gas containing VOC that described paint spray booth discharges pressurizes through exhaust gas fan, be delivered to filter, after filtration after device removing bulky grain coating cloud, dust, to adsorption runner by concentrated 3 ~ 20 times of exhaust gas concentration, cleaned waste gas directly discharges, and concentrated waste gas is continuous module conveying backward.
Above-mentioned exhaust-gas treatment electricity generation module comprises Gas Turbine Generating Units, multistage compressor, cleaning device, gas-turbine combustion chamber is transferred to after the concentrated waste gas that described pre-processing module produces first is compressed by compressor, the HTHP purifying exhaust air that described Gas Turbine Generating Units is produced by combustion chamber, is partially converted into suitable stable alternating current for Painting Shop.
Above-mentioned exhaust-gas treatment electricity generation module comprises multistage compressor, direct-fired waste gas burning stove, smoke gas turbine, threephase alternator, rectifier, storage battery, combining inverter; Described direct-fired waste gas combustion furnace burnt gas and fuel, pollutant in high-temperature oxydation waste gas decomposition, the flue gas produced exports mechanical power by smoke gas turbine, own temperature drops to 600 DEG C of posteriorly module conveyings from more than 900 DEG C, smoke gas turbine drives threephase alternator to produce the alternating current of irregular frequency, through rectifier, irregular frequency alternating current is converted to direct current to be stored in storage battery, then through combining inverter direct current is converted to and inputs electrical network for Painting Shop with electrical network same frequency, synchronous sine-wave current.
Above-mentioned fume treatment module comprises heat exchanger, and the flue gas that described exhaust-gas treatment electricity generation module produces passes through heat exchanger heating, drying room air for drying chamber; When drying chamber is indirect heating type, after heat exchange, flue gas is directly entered air or is processed together by drying chamber flue gas processing device.
Above-mentioned fume treatment module also comprises filter, when drying chamber is direct-heating type, after heat exchanger heat exchange flue gas after filtration after device process with hot-air for drying chamber.
Controlled by the rotating speed of compressor, control paint spray booth's thickened waste throughput at 15000 m
3/ h ~ 50000 m
3adjustable within the scope of/h, in pipeline, gas is Laminar Flow, the noise produced when avoiding high velocity turbulent flow to carry.
The beneficial effects of the utility model are: the utility model provides a kind of energy generating utilizing burning to produce, and the flue gas of discharge is delivered to after treatment paint spray booth's waste gas purification electricity generation system of drying chamber use.The utility model solves the technical problem of the aspects such as paint spray booth's waste gas purification apparatus wide usage is poor, and economy is not good enough, and technology upgrading transformation property is poor, and maintenance of clean-up is inconvenient simultaneously.
Accompanying drawing explanation
Fig. 1 is architecture system block diagram of the present utility model;
Fig. 2 is the system block diagram of pre-processing module of the present utility model;
Fig. 3 is the system block diagram of exhaust-gas treatment electricity generation module of the present utility model;
Fig. 4 is the system block diagram of another kind of exhaust-gas treatment electricity generation module of the present utility model;
Fig. 5 is the system block diagram of fume treatment module of the present utility model;
Fig. 6 is the system block diagram of another kind of fume treatment module of the present utility model;
Fig. 7 is the architecture system block diagram of embodiment.
Detailed description of the invention
Below in conjunction with Figure of description, the utility model is further described.
As shown in Figure 1, a kind of paint spray booth waste gas purification electricity generation system, comprise pre-processing module, exhaust-gas treatment electricity generation module and fume treatment module, the waste gas that described paint spray booth produces is by being transported to exhaust-gas treatment electricity generation module after pre-processing module process, the delivery of electrical energy that described exhaust-gas treatment electricity generation module produces is to electrical network, the flue gas produced is by fume treatment resume module, and its hot-air produced transfers to drying chamber and uses.
As shown in Figure 2, above-mentioned pre-processing module comprises exhaust gas fan, filter, adsorption runner, the waste gas containing VOC that described paint spray booth discharges pressurizes through exhaust gas fan, be delivered to filter, after filtration after device removing bulky grain coating cloud, dust, to adsorption runner by concentrated 3 ~ 20 times of exhaust gas concentration, cleaned waste gas directly discharges, and concentrated waste gas is continuous module conveying backward.
As shown in Figure 3, above-mentioned exhaust-gas treatment electricity generation module comprises Gas Turbine Generating Units, cleaning device, multistage compressor, Gas Turbine Generating Units is transferred to after the concentrated waste gas that described pre-processing module produces first is compressed by compressor, the HTHP purifying exhaust air that described Gas Turbine Generating Units is produced by combustion chamber, is partially converted into suitable stable alternating current for Painting Shop.
As shown in Figure 4, above-mentioned exhaust-gas treatment electricity generation module comprises direct-fired waste gas burning stove, smoke gas turbine, threephase alternator, rectifier, storage battery, combining inverter; Described direct-fired waste gas combustion furnace burnt gas and fuel, pollutant in high-temperature oxydation waste gas decomposition, the flue gas produced exports mechanical power by smoke gas turbine, own temperature drops to 600 DEG C of posteriorly module conveyings from more than 900 DEG C, smoke gas turbine drives threephase alternator to produce the alternating current of irregular frequency, through rectifier, irregular frequency alternating current is converted to direct current to be stored in storage battery, then through combining inverter direct current is converted to and inputs electrical network for Painting Shop with electrical network same frequency, synchronous sine-wave current.
As shown in Figure 5, above-mentioned fume treatment module comprises heat exchanger, and the flue gas that described exhaust-gas treatment electricity generation module produces passes through heat exchanger heating, drying room air for drying chamber; When drying chamber is indirect heating type, after heat exchange, flue gas is directly entered air or is processed together by drying chamber flue gas processing device.
As shown in Figure 6, above-mentioned fume treatment module also comprises filter, when drying chamber is direct-heating type, after heat exchanger heat exchange flue gas after filtration after device process with hot-air for drying chamber.
Preferably, the pipeline of above-mentioned modules selects DN800 ~ DN1600, is controlled by the rotating speed of compressor, ensures that paint spray booth's exhaust gas flow is at 15000 m
3/ h ~ 100000 m
3within the scope of/h during change, in pipeline, gas is Laminar Flow, the noise produced when avoiding high velocity turbulent flow to carry.
Embodiment:
As shown in Figure 7, through exhaust gas fan 1 pressurized delivered, to filter 2, filter bulky grain dust, dust and larger coating cloud group is delivered to adsorption runner 3 to paint spray booth's waste gas excessively.Adsorption runner 3 is by normal temperature absorption, elevated temperature desorption process, and the waste gas of major part absorption removing pollutant is directly entered air, and fraction carries out elevated temperature desorption through heating to adsorption runner through the waste gas of adsorption process, and is delivered to Gas Turbine Generating Units 4.Exhaust gas concentration is improved 3 ~ 20 times by adsorption runner, need process dusty gas simultaneously and be reduced to 1/3 ~ 1/20.
Concentrated waste gas is entering gas-turbine combustion chamber through multistage compressor, and combustion chamber sprays into natural gas or diesel fueled combustion.The concentrated combustion chamber high temperature oxidation Decomposition of waste gas in Gas Turbine Generating Units 4, produces the high-temperature flue gas of more than about 900 DEG C.High-temperature flue gas exports by power turbine the running that mechanical power drives generator.The equipment such as rectifier, inverter that the irregular frequency alternating current produced carries through Gas Turbine Generating Units 4 is converted to and inputs electrical network for Painting Shop with electrical network same frequency, synchronous sine-wave current.High-temperature flue gas is after multistage turbine, and temperature is reduced to 600 DEG C by more than 900 DEG C and is delivered to heat exchanger 7 through flue gas pipeline.When concentrated waste gas and natural gas ratio deficiency, input combustion air by combustion fan 5 and ensure that Gas Turbine Generating Units runs well.Cleaning device 6 is set simultaneously, for the daily cleaning maintenance of Gas Turbine Generating Units.
The fresh air of 20 DEG C carries out heat exchange through 600 DEG C of flue gases of heat exchanger 7 front portion generation, and the hot-air producing 120 ~ 180 DEG C is delivered to drying chamber use, and the flue gas after heat exchange directly discharges and enters air.
Of the present utility modelly to have the following advantages:
One, good upgrading.The utility model can be used for the transformation of existing all types of paint spray booths emission-control equipment, improves the heat energy recycle effect produced in processing procedure.Existing paint spray booth exhaust-gas treatment mainly adopts adsorption runner+directly burning and adsorption runner+heat storage type combustion two kinds of processing modes.
Adopting the occasion of adsorption runner+directly combustion system process, only need increase after direct-fired combustion furnace with the smoke gas turbine TRT of smoke gas turbine drive electrical generators group.Algorithm Stability of Gas Turbine Performance after direct-fired combustion furnace becomes to meet the fume treatment module of drying chamber mode of heating, and improvement expenses, cycle are lower.
Adopting the occasion of adsorption runner+heat storage type combustion process, regenerative combustion furnace exit gas temperature is generally 140 DEG C ~ 200 DEG C, and the hot-air/flue gas that cannot temperature be provided suitable while generating is to drying chamber.
According to the low pressure expansion turbine TRT of low pressure expansion turbine drive electrical generators group, flue-gas temperature can be down to less than 100 DEG C, is suitable for directly entering air, can save part heat exchanger and pipeline.
According to fume treatment module, can reduce for drying chamber insulation, intensification hot air flowrate, reduce fuel use amount.And the exhaust apparatus of regenerative combustion furnace can be cancelled, utilize drying chamber or the discharge of all the other exhaust apparatus of workshop.
Two, good stain resistance, outstanding clean and maintenance.In paint spray booth's waste gas, coating cloud easily pollutes equipment.Coating cloud is attached to metal surface, toasts through 120 ~ 200 DEG C of temperature 10 ~ 20min by coating type difference, namely forms enamelled coating and is firmly attached to metal surface, is difficult to adopt physical means cleaning.Even if at normal temperatures, after experiencing long-time natural air drying, coating is dry and hard in equipment surface, removes difficulty.
In pre-processing module, filter can adopt dry filter bag or other can simple easily changeable filter, also can set up coating cloud filter cotton and reduce the coating cloud concentration entering subsequent module.Adsorption runner has good recyclability, can effective regeneration at 300 DEG C.The gas channel of adsorption runner honeycomb has larger circulation area, still can effectively work when being attached with a small amount of coating cloud.
In exhaust-gas treatment electricity generation module, TRT, rectifier, inverter all not with pollution exhaust gas contact, only gas turbine/direct-fired combustion furnace with contain gases contact.
The air inlet of modern industry gas turbine many employings air inlet volute, is equipped with multi stage axial flow compressor compressed air, and 1 ~ 2 grade of gas turbine drives compressor running, and turbine flow is for exporting mechanical power.After waste gas enters air inlet volute, coating cloud can impact air inlet volute inner surface because of centrifugal action, sticks on air inlet volute.The guider adopting stainless steel or titanium alloy fine processing polished stator blade surface is equipped with, for regulating inlet air flow velocity attitude before axial flow compressor rotor at different levels.Coating cloud is at first order guider place, and because air velocity is lower, the gas channel distortion that stator blade is formed changes greatly, and may be adsorbed on first order guider stator blade.During normal work, axial flow compressor rotor rotating speed is 5000 ~ 9000r/min, and after first order shaft flow rotor, air velocity significantly promotes, and coating cloud cannot stop.After coating cloud enters combustion chamber with waste gas, main component is that namely the coating cloud of various types of resins is decomposed into all kinds of gas and water at 600 DEG C.
Industrial gas turbine is equipped with cleaning bypass, controls opening and closing by butterfly valve.When cleaning bypass is opened, gas turbine cuts off gas inlet pipeline and fuel conduit, and cleaning device pumps into cleaning agent to gas turbine, and actuating motor drives gas turbine blowdown firing, washing gas turbine is inner, and the waste water that cleaning produces is discharged from bottom by discharge of gas turbine valve.Air inlet volute dismounting is simple, is convenient to cleaning.Axial flow compressor guider material is special, smooth surface, and coating cloud forms enamelled coating and easily comes off, and gas turbine pumps into the cleaning of cleaning agent blowdown firing and can effectively remove.
Direct-fired combustion furnace has good stain resistance and self-cleaning, without the need to too much complicated clean and maintenance program.
Smoke gas turbine carries programme controlled water mist sprinkling formula cleaning device, shower water or cleaning agent can be used for clean turbo blade and internal cavity.
Three, economy.The utility model utilizes waste gas to generate electricity, and the flue gas that burning produces is provided to drying chamber, has both decreased electric energy spending, can reduce drying chamber fuel consumption again.
With paint spray booth waste gas air quantity 30000 m after pretreating device is concentrated
3/ h, wherein VOC pollutant levels are 2500mg/m
3, the typical automotive Painting Shop of VOC pollutant calorific value 43500KJ/kg calculates.Drying chamber and waste gas generating processing module take natural gas as fuel, and density is 0.7174kg/m
3, calorific value is 36000KJ/m
3.When adopting with Gas Turbine Generating Units process waste gas, Gas Turbine Generating Units generating efficiency is got 28%(and is generally 25% ~ 35%), electric current is 5% through the loss of rectifier, and during inverter switching current, loss is 10%.
Do not increasing extra combustion air, only when burning paint spray booth's waste gas, the general mixed proportion of natural gas and combustion air ratio 1:10 that adopts ensures to burn completely, therefore gas consumption measures 3000 m
3/ h.Exhaust-gas treatment TRT generated output W is:
W=（43500×0.001×30000+3000×36000×0.7174）×0.35×0.95×0.9÷3600=5239.1kW
For Jiangsu Province, Gas Prices is now 2.2 yuan every cubic metre, and exhaust-gas treatment TRT electricity price about 1 yuan of every kilowatt hour, lower by 10% than electricity price for industrial uses 1.1 yuan of every kilowatt hours as calculated.
Exhaust-gas treatment TRT produces temperature 600 DEG C, air quantity 33000m
3the flue gas of/h.When drying chamber adopts indirect heating manner, heat exchanger heat exchange efficiency gets 95%, flue-gas temperature 200 DEG C after heat exchange, fresh air inlet temperature 20 DEG C, and outlet temperature 160 DEG C calculating, can produce 87600 m
3/ h hot-air, reduces gas consumption 350 m
3/ h.
More than show and describe general principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and description just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (7)
1. paint spray booth's waste gas purification electricity generation system, it is characterized in that: comprise pre-processing module, exhaust-gas treatment electricity generation module and fume treatment module, the waste gas that described paint spray booth produces is by being transported to exhaust-gas treatment electricity generation module after pre-processing module process, the delivery of electrical energy that described exhaust-gas treatment electricity generation module produces is to electrical network, the flue gas produced is by fume treatment resume module, and its hot-air produced transfers to drying chamber and uses.
2. paint spray booth according to claim 1 waste gas purification electricity generation system, it is characterized in that: described pre-processing module comprises exhaust gas fan, filter, adsorption runner, the waste gas containing VOC that described paint spray booth discharges pressurizes through exhaust gas fan, be delivered to filter, after filtration after device removing bulky grain coating cloud, dust, to adsorption runner by concentrated 3 ~ 20 times of exhaust gas concentration, cleaned waste gas directly discharges, and concentrated waste gas is continuous module conveying backward.
3. paint spray booth according to claim 1 waste gas purification electricity generation system, it is characterized in that: described exhaust-gas treatment electricity generation module comprises Gas Turbine Generating Units, multistage compressor, cleaning device, gas-turbine combustion chamber is transferred to after the concentrated waste gas that described pre-processing module produces first is compressed by compressor, the HTHP purifying exhaust air that described Gas Turbine Generating Units is produced by combustion chamber, is partially converted into suitable stable alternating current for Painting Shop.
4. paint spray booth according to claim 1 waste gas purification electricity generation system, is characterized in that: described exhaust-gas treatment electricity generation module comprises multistage compressor, direct-fired waste gas burning room, smoke gas turbine, threephase alternator, rectifier, storage battery, combining inverter; Described direct-fired burned waste gas room burnt gas and fuel, pollutant in high-temperature oxydation waste gas decomposition, the flue gas produced exports mechanical power by smoke gas turbine, own temperature drops to 600 DEG C of posteriorly module conveyings from more than 900 DEG C, smoke gas turbine drives threephase alternator to produce the alternating current of irregular frequency, through rectifier, irregular frequency alternating current is converted to direct current to be stored in storage battery, then through combining inverter direct current is converted to and inputs electrical network for Painting Shop with electrical network same frequency, synchronous sine-wave current.
5. paint spray booth according to claim 1 waste gas purification electricity generation system, is characterized in that: described fume treatment module comprises heat exchanger, and the flue gas that described exhaust-gas treatment electricity generation module produces passes through heat exchanger heating, drying room gas for drying chamber; When drying chamber is indirect heating type, after heat exchange, flue gas is directly entered air or is processed together by drying chamber flue gas processing device.
6. paint spray booth according to claim 5 waste gas purification electricity generation system, it is characterized in that: described fume treatment module also comprises filter, when drying chamber is direct-heating type, after heat exchanger heat exchange flue gas after filtration after device process with hot-air for drying chamber.
7. paint spray booth according to claim 1 waste gas purification electricity generation system, be is characterized in that: controlled by the rotating speed of compressor, controls paint spray booth's thickened waste throughput at 15000 m
3/ h ~ 50000 m
3adjustable within the scope of/h, in pipeline, gas is Laminar Flow, the noise produced when avoiding high velocity turbulent flow to carry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420767064.XU CN204319961U (en) | 2014-12-09 | 2014-12-09 | A kind of paint spray booth waste gas purification electricity generation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420767064.XU CN204319961U (en) | 2014-12-09 | 2014-12-09 | A kind of paint spray booth waste gas purification electricity generation system |
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| Publication Number | Publication Date |
|---|---|
| CN204319961U true CN204319961U (en) | 2015-05-13 |
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ID=53156366
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|---|---|---|---|
| CN201420767064.XU Withdrawn - After Issue CN204319961U (en) | 2014-12-09 | 2014-12-09 | A kind of paint spray booth waste gas purification electricity generation system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104436893A (en) * | 2014-12-09 | 2015-03-25 | 江苏骠马智能装备股份有限公司 | Waste gas purification and power generation system for spray booth |
| CN106369617A (en) * | 2016-11-07 | 2017-02-01 | 中国石油大学(华东) | Efficient VOC treatment system and treatment process flow adopting novel heat exchanger |
| CN107120666A (en) * | 2017-04-24 | 2017-09-01 | 航天凯天环保科技股份有限公司 | One kind spraying exhaust gas purifying method and device |
| CN108730997A (en) * | 2018-05-30 | 2018-11-02 | 苏州市玄天环保科技有限公司 | A kind of waste gas treatment equipment carrying out energy recovery |
-
2014
- 2014-12-09 CN CN201420767064.XU patent/CN204319961U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104436893A (en) * | 2014-12-09 | 2015-03-25 | 江苏骠马智能装备股份有限公司 | Waste gas purification and power generation system for spray booth |
| CN106369617A (en) * | 2016-11-07 | 2017-02-01 | 中国石油大学(华东) | Efficient VOC treatment system and treatment process flow adopting novel heat exchanger |
| CN107120666A (en) * | 2017-04-24 | 2017-09-01 | 航天凯天环保科技股份有限公司 | One kind spraying exhaust gas purifying method and device |
| CN108730997A (en) * | 2018-05-30 | 2018-11-02 | 苏州市玄天环保科技有限公司 | A kind of waste gas treatment equipment carrying out energy recovery |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150513 Effective date of abandoning: 20160907 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |