CN203938658U - The integrated system of a kind of biomass gas purifying and combustion tail gas residual heat recovery - Google Patents
The integrated system of a kind of biomass gas purifying and combustion tail gas residual heat recovery Download PDFInfo
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- CN203938658U CN203938658U CN201420329572.XU CN201420329572U CN203938658U CN 203938658 U CN203938658 U CN 203938658U CN 201420329572 U CN201420329572 U CN 201420329572U CN 203938658 U CN203938658 U CN 203938658U
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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Abstract
The utility model discloses the integrated system of a kind of biomass gas purifying and combustion tail gas residual heat recovery, comprise biomass gasifying furnace, strainer, interchanger and combustion unit, strainer has two filter chambers arranged side by side, one end of two filter chambers is respectively equipped with fuel gas inlet and exhanst gas outlet, the other end of two filter chambers respectively correspondence is provided with gas outlet and gas approach, by arrange two independently filter chamber respectively biological fuel gas and biomass flue gas are carried out to alternate treatment, during biological fuel gas process filter chamber, can filter most of dust, it is coal-tar middle oil can be cleaved into inflammable gas under the condition of high temperature, improve the gasification efficiency of biological fuel gas, and high-temperature biomass flue gas is when the filter chamber, can make it in the condition of high temperature by hot filtration apparatus, and then provide condition for biological fuel gas cracking, simultaneously, also can improve the temperature of biological fuel gas, and then raising efficiency of combustion, last biomass flue gas carries out heat exchange processing by interchanger again, fully recycles the waste heat of biomass flue gas.
Description
Technical field
the utility model relates to biomass energy purification treatment technology field, particularly a kind of integrated system for the biomass gas purifying on industrial smelting furnace and combustion tail gas residual heat recovery.
Background technology
Biomass are a kind of clean renewable energy sources, and rationally utilization can be alleviated the pressure that current conventional energy resources is short and environmental pollution brings.Gasifying biomass is one of major way to Biomass Energy Utilization, its primary process comprises: biomass are converted to biological fuel gas by thermochemistry, and biological fuel gas is delivered to burning in the combustion equipment such as boiler, molten aluminium stove or internal combustion engine generator and utilized by pipe-line transportation system.
Yet, in biomass gasification process, burnt oil component and coke are inevitable byproducts, tar at normal temperatures can condensation, and coke, ash etc. form close-burning thing, can be to follow-up pipeline felt jam, cause the infringement of the equipment such as pipeline, elbow, in view of the harm of tar, biological fuel gas needed to remove purification before terminal is used, to guarantee the safety and stability use of gas system.
At present, biomass char oil purification mainly contains the modes such as physical filtering, catalytic pyrolysis, spray-absorption, but biological fuel gas temperature is approximately 300 ℃, adopts spray-absorption can not make full use of combustion gas sensible heat, and spray sewage disposal is also a difficult problem; And physical filtering easily stops up filtering net, the easy inactivation of catalyzer in catalytic pyrolysis process, is industrially difficult to long-time use.Therefore, how processing tar in biological fuel gas becomes biomass and utilizes a difficult problem needing solution in process badly.
Biological fuel gas is after burning; its flue gas can reach very high temperature; particularly in the molten aluminium stove production process of industry; the flue-gas temperature of its smoke outlet can reach 950 ℃ of left and right conventionally; if these high-temperature flue gas are directly discharged in environment; not only can cause energy dissipation, also can cause destruction to a certain degree to environment.
Utility model content
Technical problem to be solved in the utility model is to provide the integrated system of a kind of biomass gas purifying and combustion tail gas residual heat recovery, by this system, can effectively remove tar and the dust in biological fuel gas, and the biomass flue gas waste heat after burning is effectively recycled.
For solving the problems of the technologies described above adopted technical scheme: the integrated system of a kind of biomass gas purifying and combustion tail gas residual heat recovery, comprise biomass gasifying furnace, strainer, interchanger and combustion unit, described strainer has two filter chambers arranged side by side, one end of two described filter chambers is respectively equipped with fuel gas inlet and exhanst gas outlet, the other end of two described filter chambers respectively correspondence is provided with gas outlet and gas approach, the air outlet of described biomass gasifying furnace is connected with the fuel gas inlet of two filter chambers, the gas port of described combustion unit is connected with the gas outlet of two filter chambers, the flue gas mouth of described combustion unit is connected with the gas approach of two filter chambers, the exhanst gas outlet of two described filter chambers is connected with interchanger, fuel gas inlet described in each, gas outlet, gas approach and smoke outlet respectively correspondence are provided with pneumavalve.
Further, described strainer is made by lagging material, is respectively equipped with the vision slit of observing two filter chambers on described strainer, in two described filter chambers, is respectively equipped with honeycomb ceramic heat accumulator and filter ball.
Further, on the pipeline being connected at the gas port of described combustion unit and the gas outlet of two filter chambers, be provided with induced draft fan, on the pipeline being connected in the air outlet of described biomass gasifying furnace and the fuel gas inlet of two filter chambers, be provided with tornado dust collector.
Further, described interchanger comprises adjacent adjacent gas converting heat passage and liquid heat exchange passage, the inlet mouth of described gas converting heat passage is connected with exhanst gas outlet, the air outlet of described gas converting heat passage is connected with sack cleaner, induced draft fan in turn, the water-in of described liquid heat exchange passage is connected to a water inlet, and the water outlet of described liquid heat exchange passage is connected with biomass gasifying furnace.
Further, on the pipeline being connected with vapourizing furnace at described liquid heat exchange passage, be provided with vortex shedding flow meter.
Further, in described interchanger bottom, be also provided with ash storage room, described ash storage room has an ash removing opening, between described interchanger and ash storage room, is provided with gate valve.
Beneficial effect: in this purifying treatment and waste heat recycling system by arrange two independently filter chamber respectively biological fuel gas and biomass flue gas are carried out to alternate treatment, during biological fuel gas process filter chamber, can filter most of dust, it is coal-tar middle oil can be cleaved into inflammable gas under the condition of high temperature, improves the gasification efficiency of biological fuel gas; And high-temperature biomass flue gas is when the filter chamber, can make it in the condition of high temperature by hot filtration apparatus, and then provide condition for biological fuel gas cracking, simultaneously, also can improve the temperature of biological fuel gas, and then raising efficiency of combustion, the biomass flue gas after filter is processed carries out heat exchange processing by interchanger again, fully recycles the waste heat of biomass flue gas.By this system, the purifying treatment of biological fuel gas and the heat recovery of biomass flue gas have effectively been realized.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described further;
Fig. 1 is the system schematic of the utility model embodiment;
Fig. 2 is the structural representation of the utility model embodiment middle filtrator;
Fig. 3 is the structural representation of interchanger in the utility model embodiment.
Embodiment
Referring to figs. 1 through Fig. 3, the integrated system of a kind of biomass gas purifying of the utility model and combustion tail gas residual heat recovery, comprise biomass gasifying furnace 10, strainer 20, interchanger 30 and combustion unit 40, strainer 20 has two filter chambers arranged side by side 21, one end of two filter chambers 21 is respectively equipped with fuel gas inlet 211 and exhanst gas outlet 214, the other end of two filter chambers 21 respectively correspondence is provided with gas outlet 212 and gas approach 213, the air outlet of biomass gasifying furnace 10 is connected with the fuel gas inlet of two filter chambers 21, the gas port 41 of combustion unit 40 is connected with the gas outlet 212 of two filter chambers 21, the flue gas mouth 42 of combustion unit 40 is connected with the gas approach 213 of two filter chambers 21, the exhanst gas outlet 214 of two filter chambers 21 is connected with interchanger 30, in each fuel gas inlet 211, gas outlet 212, gas approach 213 and exhanst gas outlet 214 places respectively correspondence are provided with pneumavalve 22.
Wherein, on the pipeline being connected at the gas port of combustion unit 40 and the gas outlet 212 of two filter chambers 21, be provided with induced draft fan 50, for the conveying of biological fuel gas; On the pipeline being connected in the air outlet of biomass gasifying furnace 10 and the fuel gas inlet 211 of two filter chambers 21, be provided with tornado dust collector 60, tornado dust collector 60 can be removed the part dust in biological fuel gas.
In the present embodiment, strainer 20 adopts fireproof high-temperature resistant material to make, in the middle of strainer 20, be provided with dividing plate, strainer 20 internal cavities are separated and are two filter chambers 21, in each filter chamber 21, be provided with honeycomb ceramic heat accumulator 23 and filter ball 24, when combustion gas process filter chamber 21, filter ball 24 can filter most of dust, when high-temperature flue gas (950 ℃) process filter chamber 21, honeycomb ceramic heat accumulator 23 can absorb the heat that stores high-temperature flue gas, make strainer 20 in the condition of high temperature, and then the coke tar cracking in biological fuel gas is to inflammable gas, improve biological fuel gas calorific value, improve gasification efficiency, can also improve the temperature of the follow-up biological fuel gas entering simultaneously, improve efficiency of combustion, the temperature of biological fuel gas can be increased to approximately 300 ℃.
Wherein, pneumavalve 22 is to use for the switching of two filter chambers 21, and in use procedure, one of them filter chamber 21 is used for filtration treatment biological fuel gas, and biological fuel gas carries out coke tar cracking filtered tar and dust by filter chamber 21 from the bottom to top; Another filter chamber 21 is used for filtration treatment biomass flue gas, and biomass flue gas is from top to bottom undertaken leaving tar and dust in accumulation of heat blowback filter chamber 21 by filter chamber 21, and two filter chambers 21 are switched and are used alternatingly by pneumavalve 22.
Particularly, by controlling the switching of each pneumavalve 22, make two filter chambers 21 separately process biological fuel gas and biomass flue gas, pneumavalve 22 comprises fuel gas inlet valve 221, gas outlet valve 222, gas approach valve 223 and the exhanst gas outlet valve 224 that is separately positioned on each fuel gas inlet 211, gas outlet 212, gas approach 213 and exhanst gas outlet 214 places.As shown in Figure 2, when adopting left side filter chamber 21 to carry out filtration treatment biological fuel gas, when the right filter chamber 21 carries out filtration treatment biomass flue gas, unlatching is positioned at the fuel gas inlet valve 221 on the left side and closes the fuel gas inlet valve 221 that is positioned at the right, unlatching is positioned at the gas outlet valve 222 on the left side and closes the gas outlet valve 222 that is positioned at the right, unlatching is positioned at the gas approach valve 223 on the right and closes the gas approach valve 223 that is positioned at the left side, unlatching is positioned at the exhanst gas outlet valve 224 on the right and closes the exhanst gas outlet valve 224 that is positioned at the left side, now biological fuel gas only enters the filter chamber 21 on the left side from being arranged in the fuel gas inlet 211 on the left side, through being arranged in the gas outlet 212 on the left side, be expelled to combustion unit 40 again, the biomass flue gas that combustion unit 40 produces only enters the filter chamber 21 on the right from being arranged in the gas approach 213 on the right, through being positioned at the exhanst gas outlet 214 on the right, discharge again, thereby reach left side filter chamber 21 and carry out filtration treatment biological fuel gas, the right filter chamber 21 carries out filtration treatment biomass flue gas.
Wherein each fuel gas inlet valve 221, gas outlet valve 222, gas approach valve 223 and exhanst gas outlet valve 224 all adopt PLC system to control switching, so that left side filter chamber 21 regularly switches and uses with the right filter chamber 21.
Interchanger 30 mainly will carry out waste heat recovery through filter 20 high-temperature flue gas out, as preferably, interchanger 30 comprises adjacent adjacent gas converting heat passage and liquid heat exchange passage, the inlet mouth 31 of gas converting heat passage is connected with exhanst gas outlet 214, the air outlet 32 of gas converting heat passage is connected with sack cleaner 70 in turn, induced draft fan 50, the water-in 33 of liquid heat exchange passage is connected to a water coolant water inlet, the water outlet 34 of liquid heat exchange passage is connected with biomass gasifying furnace 10, high-temperature flue gas and water carry out heat exchange at gas converting heat passage and liquid heat exchange passage, high-temperature flue gas forms low-temperature flue gas after the heat exchange of interchanger 30, its temperature is lower than 80 ℃, can guarantee sack cleaner 70 safe handlings, sack cleaner 70 is removed dust in flue gas, make to enter again in atmosphere after its load environmental requirement, and forming water vapour after the heat exchange of interchanger 30, water sent by water outlet 34, the reduction zone that the water vapour producing passes in biomass gasifying furnace 10 through a vortex shedding flow meter again utilizes, so effectively the waste heat in high-temperature flue gas is recycled.
In the bottom of interchanger 30, also there is an ash storage room 35, ash storage room 35 has an ash removing opening 36 in order to dusting out, between interchanger 30 and ash storage room 35, be provided with gate valve 37, during normal use, gate valve 37 is in opening state, when needing deashing, gate valve 37 is closed, open ash removing opening 36 cleanings of ash storage room 35.
The principle of work of the integrated system of the utility model biomass gas purifying and combustion tail gas residual heat recovery is as follows: the biological fuel gas that biomass gasifying furnace 10 produces is after tornado dust collector 60 remove portion dusts, one of them filter chamber 21 entering again in strainer 20 carries out biomass fuel gas disposal, biological fuel gas carries out coke tar cracking filtered tar and dust in filter chamber 21, biological fuel gas after processing enters burning in combustion unit 40, the biomass flue gas that combustion unit 40 burnings produce passes in the another one filter chamber 21 in strainer 20 again and carries out leaving tar and dust in accumulation of heat blowback filter chamber 21, biomass flue gas after processing passes into and in interchanger 30, carries out heat exchange processing, reclaim the waste heat of biomass flue gas, the low-temperature flue gas finally producing drains in atmosphere after sack cleaner 70 is processed.Two filter chambers 21 in its middle filtrator 20 regularly switch respectively alternately rotation to be processed biological fuel gas and biomass flue gas.
By reference to the accompanying drawings embodiment of the present utility model is explained in detail above, but the utility model is not limited to above-mentioned embodiment, in the ken possessing at described technical field those of ordinary skill, can also under the prerequisite that does not depart from the utility model aim, make various variations.
Claims (6)
1. the integrated system of a biomass gas purifying and combustion tail gas residual heat recovery, it is characterized in that: comprise biomass gasifying furnace, strainer, interchanger and combustion unit, described strainer has two filter chambers arranged side by side, one end of two described filter chambers is respectively equipped with fuel gas inlet and exhanst gas outlet, the other end of two described filter chambers respectively correspondence is provided with gas outlet and gas approach, the air outlet of described biomass gasifying furnace is connected with the fuel gas inlet of two filter chambers, the gas port of described combustion unit is connected with the gas outlet of two filter chambers, the flue gas mouth of described combustion unit is connected with the gas approach of two filter chambers, the exhanst gas outlet of two described filter chambers is connected with interchanger, fuel gas inlet described in each, gas outlet, gas approach and smoke outlet respectively correspondence are provided with pneumavalve.
2. the integrated system of biomass gas purifying according to claim 1 and combustion tail gas residual heat recovery, it is characterized in that: described strainer is made by lagging material, on described strainer, be respectively equipped with the vision slit of observing two filter chambers, in two described filter chambers, be respectively equipped with honeycomb ceramic heat accumulator and filter ball.
3. the integrated system of biomass gas purifying according to claim 1 and 2 and combustion tail gas residual heat recovery, it is characterized in that: on the pipeline being connected at the gas port of described combustion unit and the gas outlet of two filter chambers, be provided with induced draft fan, on the pipeline being connected in the air outlet of described biomass gasifying furnace and the fuel gas inlet of two filter chambers, be provided with tornado dust collector.
4. the integrated system of biomass gas purifying according to claim 1 and 2 and combustion tail gas residual heat recovery, it is characterized in that: described interchanger comprises adjacent adjacent gas converting heat passage and liquid heat exchange passage, the inlet mouth of described gas converting heat passage is connected with exhanst gas outlet, the air outlet of described gas converting heat passage is connected with sack cleaner, induced draft fan in turn, the water-in of described liquid heat exchange passage is connected to a water inlet, and the water outlet of described liquid heat exchange passage is connected with biomass gasifying furnace.
5. the integrated system of biomass gas purifying according to claim 4 and combustion tail gas residual heat recovery, is characterized in that: on the pipeline being connected with vapourizing furnace at described liquid heat exchange passage, be provided with vortex shedding flow meter.
6. follow the integrated system according to biomass gas purifying claimed in claim 1 and combustion tail gas residual heat recovery, it is characterized in that: in described interchanger bottom, be also provided with ash storage room, described ash storage room has an ash removing opening, between described interchanger and ash storage room, is provided with gate valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420329572.XU CN203938658U (en) | 2014-06-19 | 2014-06-19 | The integrated system of a kind of biomass gas purifying and combustion tail gas residual heat recovery |
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| CN201420329572.XU CN203938658U (en) | 2014-06-19 | 2014-06-19 | The integrated system of a kind of biomass gas purifying and combustion tail gas residual heat recovery |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104073297A (en) * | 2014-06-19 | 2014-10-01 | 广东正鹏生物质能源科技有限公司 | Integrated system for purifying biomass fuel gas and recycling combustion tail gas waste heat |
| CN104560218A (en) * | 2014-12-18 | 2015-04-29 | 广东正鹏生物质能源科技有限公司 | Biomass gasifier/industrial gas boiler combined high-efficiency heating system |
| CN104740967A (en) * | 2015-03-19 | 2015-07-01 | 东南大学 | Apparatus and method for efficient dust removal with vapor by virtue of fast pyrolysis of biomass |
| CN105524665A (en) * | 2016-01-26 | 2016-04-27 | 成都易态科技有限公司 | High-temperature gas filtration method and system |
| CN105879508A (en) * | 2016-05-24 | 2016-08-24 | 河南龙成煤高效技术应用有限公司 | Dust-cleaning device, dust-cleaning system composed of dust-cleaning device and dust-cleaning method thereof |
| WO2017211130A1 (en) * | 2016-06-07 | 2017-12-14 | 广东工业大学 | Integrated system for biological particle gasification combustion and steam generation |
| CN111135650A (en) * | 2019-12-31 | 2020-05-12 | 中国化学工程第十三建设有限公司 | Tail gas treatment device for gasification furnace |
| CN111998371A (en) * | 2020-09-15 | 2020-11-27 | 中国农业科学院农业环境与可持续发展研究所 | Method for removing and recycling tar in straw bundle burning flue gas |
| CN113654037A (en) * | 2021-08-20 | 2021-11-16 | 华冠特种设备(江苏)有限公司 | Horizontal internal combustion wet-back type boiler shell boiler and working method thereof |
-
2014
- 2014-06-19 CN CN201420329572.XU patent/CN203938658U/en not_active Withdrawn - After Issue
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104073297B (en) * | 2014-06-19 | 2016-04-20 | 广东正鹏生物质能源科技有限公司 | The integrated system of a kind of biomass gas purifying and combustion tail gas residual heat recovery |
| CN104073297A (en) * | 2014-06-19 | 2014-10-01 | 广东正鹏生物质能源科技有限公司 | Integrated system for purifying biomass fuel gas and recycling combustion tail gas waste heat |
| CN104560218A (en) * | 2014-12-18 | 2015-04-29 | 广东正鹏生物质能源科技有限公司 | Biomass gasifier/industrial gas boiler combined high-efficiency heating system |
| CN104560218B (en) * | 2014-12-18 | 2016-12-07 | 广东正鹏生物质能源科技有限公司 | A kind of biomass gasifying furnace and the efficient heating system of industrial combustion gas unified boiler |
| CN104740967A (en) * | 2015-03-19 | 2015-07-01 | 东南大学 | Apparatus and method for efficient dust removal with vapor by virtue of fast pyrolysis of biomass |
| CN104740967B (en) * | 2015-03-19 | 2017-01-18 | 东南大学 | Apparatus and method for efficient dust removal with vapor by virtue of fast pyrolysis of biomass |
| CN105524665B (en) * | 2016-01-26 | 2018-10-26 | 成都易态科技有限公司 | Coal gas of high temperature filter method, system |
| CN105524665A (en) * | 2016-01-26 | 2016-04-27 | 成都易态科技有限公司 | High-temperature gas filtration method and system |
| CN105879508A (en) * | 2016-05-24 | 2016-08-24 | 河南龙成煤高效技术应用有限公司 | Dust-cleaning device, dust-cleaning system composed of dust-cleaning device and dust-cleaning method thereof |
| WO2017211130A1 (en) * | 2016-06-07 | 2017-12-14 | 广东工业大学 | Integrated system for biological particle gasification combustion and steam generation |
| CN111135650A (en) * | 2019-12-31 | 2020-05-12 | 中国化学工程第十三建设有限公司 | Tail gas treatment device for gasification furnace |
| CN111135650B (en) * | 2019-12-31 | 2022-04-12 | 中国化学工程第十三建设有限公司 | Tail gas treatment device for gasification furnace |
| CN111998371A (en) * | 2020-09-15 | 2020-11-27 | 中国农业科学院农业环境与可持续发展研究所 | Method for removing and recycling tar in straw bundle burning flue gas |
| CN111998371B (en) * | 2020-09-15 | 2022-10-14 | 中国农业科学院农业环境与可持续发展研究所 | Method for removing and recycling tar in straw bundle burning flue gas |
| CN113654037A (en) * | 2021-08-20 | 2021-11-16 | 华冠特种设备(江苏)有限公司 | Horizontal internal combustion wet-back type boiler shell boiler and working method thereof |
| CN113654037B (en) * | 2021-08-20 | 2023-12-12 | 江柴发动机徐州有限公司 | Horizontal internal combustion wet-back type boiler shell boiler and working method thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20141112 Effective date of abandoning: 20160420 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |