CN114485139A - Heat conduction oil centralized heating system for coating production line - Google Patents
Heat conduction oil centralized heating system for coating production line Download PDFInfo
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- CN114485139A CN114485139A CN202210100525.7A CN202210100525A CN114485139A CN 114485139 A CN114485139 A CN 114485139A CN 202210100525 A CN202210100525 A CN 202210100525A CN 114485139 A CN114485139 A CN 114485139A
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- heat
- conduction oil
- oil
- hot water
- conducting oil
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 37
- 239000011248 coating agent Substances 0.000 title claims abstract description 24
- 238000000576 coating method Methods 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000002918 waste heat Substances 0.000 claims abstract description 17
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000003546 flue gas Substances 0.000 claims abstract description 16
- 238000011084 recovery Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 230000001105 regulatory effect Effects 0.000 claims description 16
- 230000001502 supplementing effect Effects 0.000 claims description 10
- 230000005855 radiation Effects 0.000 claims description 9
- 238000003860 storage Methods 0.000 claims description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- 239000003345 natural gas Substances 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000005485 electric heating Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
- B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
- B05D3/0413—Heating with air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H7/00—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release
- F24H7/02—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid
-
- 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
- Y02E20/30—Technologies for a more efficient combustion or heat usage
-
- 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
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Drying Of Solid Materials (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention discloses a heat-conducting oil centralized heating system for a coating production line, which comprises a heat-conducting oil boiler arranged in a boiler room, wherein the heat-conducting oil boiler is connected with a heat exchange device used for sending process hot air formed by heat exchange to the interior of a chamber body of a drying chamber through a heat-conducting oil circulating pipeline; the flue gas waste heat recovery device is connected to the pretreatment tank body and the air conditioner heating section through a hot water supply pipe and a hot water return pipe; the heat-conducting oil surplus heat conversion device is connected with a heat-conducting oil supply pipeline of the heat-conducting oil circulation pipeline through a circulation heat exchange pipeline and is used for conveying heat from the heat-conducting oil side to the pretreatment tank body and the air conditioner heating section through the hot water supply pipe and the hot water return pipe. The invention supplies heat to the coating production line in a centralized way, is stable and reliable, and meets the requirements of process functions.
Description
Technical Field
The invention relates to the technical field of heat supply of coating production lines, in particular to a heat-conducting oil centralized heat supply system of a coating production line.
Background
At present, the drying process heat source of the domestic and foreign automobile coating production line mainly adopts a distributed heating mode, a single drying chamber or a single heating area of each drying chamber is taken as a unit, natural gas is taken as energy supply, and the heat generated by burning natural gas directly or indirectly heats circulating air used by the drying chambers, and the main defect is that the distributed heating efficiency is low; the energy storage and storage function is lacked, the process temperature fluctuation in the drying chamber is large, and the working condition recovery time is long; the distributed heat supply single machine has smaller power, is not beneficial to safety control and reduction of emission indexes such as NOX and the like.
Disclosure of Invention
The invention aims to provide a heat-conducting oil centralized heating system for a coating production line aiming at the technical defects in the prior art.
The technical scheme adopted for realizing the purpose of the invention is as follows:
a heat-conducting oil centralized heating system for a coating production line comprises a heat-conducting oil boiler arranged in a boiler room, wherein the heat-conducting oil boiler is connected with a heat exchange device used for sending process hot air formed by heat exchange to the interior of a chamber body of a drying chamber through a heat-conducting oil circulation pipeline; the flue gas waste heat recovery device is connected to the process heating section through a hot water supply pipe and a hot water return pipe, and the recovered heat is used for production heating; the heat conduction oil heat surplus heat conversion device is connected with a heat conduction oil supply pipeline of the heat conduction oil circulation pipeline through a circulation heat exchange pipeline and used for conveying surplus heat on the heat conduction oil side to hot water to be used for production heating through the hot water supply pipe and the hot water return pipe.
Preferably, a first regulating valve group is arranged on the heat conducting oil pipeline to regulate the heat load required by the heat exchange device.
Preferably, the solar radiation plate heat supplementing device is arranged on the roof of the workshop, is connected to a heat conduction oil loop of the heat conduction oil circulation pipeline through a second regulating valve group, and is used for heating the heat conduction oil in the loop by collecting solar energy and refluxing the heated heat conduction oil to the heat conduction oil circulation pipeline.
Preferably, the heat-conducting oil side of the heat-conducting oil surplus heat conversion device is connected with the heat-conducting oil circulation pipeline through a third adjusting valve group, and the hot water side is connected with the hot water return pipe through a fourth adjusting valve group.
Preferably, the heat exchange device comprises a fan and a heat conduction oil heat exchanger which are arranged in the box body; the heat conduction oil heat exchanger is connected with the heat conduction oil inlet main pipe and the heat conduction oil outlet main pipe, and the heat conduction oil inlet main pipe and the heat conduction oil outlet main pipe are connected with the heat conduction oil circulation pipeline through a first adjusting valve group.
Preferably, an oil pump is arranged on a heat conduction oil return pipe of the heat conduction oil circulation pipeline, and the heat conduction oil return pipe is connected with an oil inlet and an oil outlet of the oil storage tank through a fifth valve bank and an oil inlet and outlet pipeline.
Preferably, the flue gas waste heat recovery device is provided with a water regulating valve at the water side, and two ends of the water regulating valve are connected with the hot water supply pipe and the hot water return pipe.
Preferably, the heat-conducting oil boiler is provided with a heat-conducting oil regulating valve at the heat-conducting oil side, and two ends of the heat-conducting oil regulating valve are connected with the heat-conducting oil supply pipe and the heat-conducting oil return pipe.
According to the heat conduction oil centralized heating system for the coating production line, the heat conduction oil boiler is arranged only in the independent boiler room, and the heat conduction oil water supply and return pipeline and the heat exchanger are arranged only in the coating workshop, so that the arrangement of a natural gas pipeline, a hydrogen pipeline or a bus bar in the workshop is reduced, and the safety of the workshop is integrally improved.
Drawings
FIG. 1 is a schematic view of the overall structure of a heat transfer oil central heating system of a coating production line.
Fig. 2-5 are partial enlarged schematic views of the coating production line heat conduction oil central heating system.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
According to the embodiment of the invention, on the premise of integrally planning the process heat supply requirement of the coating workshop, a gas, hydrogen-burning or electric heating heat conduction oil boiler centralized heat supply system is adopted, the heat conduction oil distribution system supplies heat to the drying chamber, and meanwhile, a waste heat recovery device and a solar radiation plate heat supplementing device are matched, so that low-carbon economy, stability and reliability are realized to the maximum extent, and the process function requirement is met.
As shown in fig. 1 to 5, the coating production line heat-conducting oil centralized heating system of the embodiment of the invention comprises a heat-conducting oil boiler 1, a heat-conducting oil circulation pipeline 2, a heat exchange device 3, a boiler exhaust pipe 4, a flue gas waste heat recovery device 5, a hot water supply pipe 6, a hot water return pipe 7, a heat-conducting oil excess heat conversion device 8 and a solar radiation plate heat supplementing device 9, wherein the heat-conducting oil boiler 1 is connected with the flue gas waste heat recovery device 5 through the boiler exhaust pipe 4, the flue gas waste heat recovery device 5 is connected with a pretreatment tank 19 and an air conditioner heating section 20 through the hot water supply pipe 6, the heat-conducting oil heating heat exchanger of the heat-conducting oil boiler 1 is connected with the heat-conducting oil heat exchanger of the heat exchange device 3 through the heat-conducting oil circulation pipeline 2, the heat recovery heat exchanger of the heat-conducting oil excess heat conversion device 8 is connected with the heat-conducting oil supply pipe of the heat-conducting oil circulation pipeline 2, the solar radiation plate heat supplementing device 9 is heated by solar energy heat supply, and a heat conduction oil heat supplementing heat exchanger of the solar radiation plate heat supplementing device is connected with a heat conduction oil return pipe of the heat conduction oil circulation pipeline 2.
The heat exchange device 3 comprises a fan 15, a filter 16 and a heat transfer oil heat exchanger 17 of the heat exchange device, the heat transfer oil heat exchanger 17 of the heat exchange device is connected to a heat transfer oil inlet main pipe 10 and a heat transfer oil outlet main pipe 11 of the heat exchange device, the heat transfer oil inlet main pipe 10 and the heat transfer oil outlet main pipe 11 of the heat exchange device are connected with a heat transfer oil circulation pipeline 2 through a first adjusting valve group 12, and the filter 16 is used for filtering circulating air.
The solar radiation plate heat supplementing device 9 is connected with the heat conduction oil circulation pipeline 2 through the second adjusting valve group 13, the heat conduction oil side of the heat conduction oil surplus heat conversion device 8 is connected with the heat conduction oil circulation pipeline 2 through the third adjusting valve group 14, and the hot water side is connected with the hot water return pipe through the fourth adjusting valve group 21.
The heat conducting oil circulation pipeline 2 comprises a heat conducting oil supply pipe, a heat conducting oil return pipe and is connected with an oil storage tank 23 and an oil pump 24, the oil pump is connected to the heat conducting oil return pipe, the oil storage tank 23 is provided with an oil inlet and an oil outlet, and the oil inlet and the oil outlet are connected with the heat conducting oil return pipe through a fifth adjusting valve group.
The flue gas side of the flue gas waste heat recovery device 5 is connected with a boiler exhaust pipe 4, the water side is connected with a hot water supply pipe 6 and a hot water return pipe 7 through a water regulating valve 18, and the heat recovered by the hot water is used for supplying to a pretreatment tank body 19 for heating or an air conditioner heating section 20 for use.
The heat-conducting oil supply pipe is connected with the heat-conducting oil return pipe, and the heat-conducting oil supply pipe is connected with the heat-conducting oil return pipe.
The heat conducting oil boiler 1 can be divided into four types, namely a gas type, a hydrogen burning type, a mixed gas (hydrogen and natural gas) burning type or an electric heating type.
During specific implementation, at least 2 heat conduction oil boilers 1 can be arranged in a boiler room according to the overall functional requirements of a coating workshop, when the normal production operation is performed, the heat conduction oil boilers 1 stably operate according to production load, and generated heat is conveyed to the heat exchange device 3 through the heat conduction oil circulation pipeline 2. The heat exchanger 3 adjusts the required heat load through the first regulating valve group 12 on the heat conducting oil pipeline, heats the circulating air to the process temperature and sends the heated circulating air to the inside of the drying chamber 22. The high-temperature flue gas discharged by the heat conduction oil boiler 1 is subjected to waste heat recovery by a flue gas waste heat recovery device 5, and the flue gas temperature is reduced to about 120 ℃ and then discharged at high altitude. The heat recovered by the flue gas waste heat recovery device 5 heats hot water, and the hot water is conveyed to the pretreatment tank body 19 and the air conditioner heating section 20 through the hot water supply pipe 6 and the hot water return pipe 7 for use. When the waste heat recovered by the flue gas does not meet the use requirements of the pretreatment tank body 19 and the air conditioner heating section 20 or the temperature of the heat conduction oil is over-temperature, the heat on the heat conduction oil side is transferred to hot water through the heat conduction oil waste heat conversion device 8 by the heat conduction oil waste heat conversion device 8, and the hot water is conveyed to the pretreatment tank body 19 and the air conditioner heating section 20 through the hot water supply pipe 6 and the hot water return pipe 7 for use. A solar radiation plate heat supplementing device 9 is arranged on the roof of the workshop, heat conduction oil is heated by collecting solar energy, and the heated heat conduction oil flows back to the heat conduction oil circulation pipeline 2.
The invention has the following remarkable characteristics:
1) besides natural gas as fuel, the heat conducting oil boiler can use hydrogen or electric heating, and can effectively reduce carbon emission.
2) The oil storage tank is arranged on the heat conduction oil supply return main pipe, the pressure stabilizing function is achieved, a small amount of energy storage function is provided, the frequent adjustment of output load of a boiler can be avoided when the production of a production line fluctuates in a short period, and the stable operation of a system and the control of process parameters and emission parameters are facilitated.
3) The solar radiation panel heat supplementing device reasonably utilizes green energy and effectively reduces carbon emission.
4) The flue gas waste heat recovery device effectively reduces the exhaust gas temperature, and the recovered heat is supplied to other equipment in a workshop for use, so that the high-grade and low-grade heat energy is utilized in a gradient manner, and the energy utilization efficiency is integrally improved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A coating production line heat conduction oil centralized heating system is characterized by comprising a heat conduction oil boiler arranged in a boiler room, wherein the heat conduction oil boiler is connected with a heat exchange device used for sending process hot air formed by heat exchange to the interior of a chamber body of a drying chamber through a heat conduction oil circulation pipeline; the flue gas waste heat recovery device is connected to the process heating section through a hot water supply pipe and a hot water return pipe, and the recovered heat is used for production heating; the heat transfer oil circulation pipeline is connected with a heat transfer oil supply pipeline of the heat transfer oil circulation pipeline through a circulation heat exchange pipeline and used for conveying heat at the heat transfer oil side to hot water through the hot water supply pipe and the hot water return pipe for production and heating.
2. The coating line conduction oil central heating system according to claim 1, wherein a first regulating valve set is arranged on the conduction oil pipeline to regulate the heat load required by the heat exchange device.
3. The coating line conduction oil central heating system according to claim 2, wherein a solar radiation plate heat supplementing device is arranged on the roof of a workshop, is connected to the conduction oil loop of the conduction oil circulation pipeline through a second regulating valve group, and is used for heating the conduction oil in the loop by collecting solar energy and returning the heated conduction oil to the conduction oil circulation pipeline.
4. The coating production line conduction oil centralized heating system according to claim 3, wherein the conduction oil side of the conduction oil surplus heat conversion device is connected with the conduction oil circulation pipeline through a third regulating valve group, and the hot water side is connected with the hot water return pipe through a fourth regulating valve group.
5. The coating line conduction oil central heating system according to claim 1, wherein the heat exchange device comprises a fan and a conduction oil heat exchanger arranged in the box body; the heat conducting oil heat exchanger is connected with the heat conducting oil inlet main pipe and the heat conducting oil outlet main pipe.
6. The coating production line conduction oil centralized heating system according to claim 1 or 5, wherein an oil pump is arranged on a conduction oil return pipe of the conduction oil circulation pipeline, and the conduction oil return pipe is connected with an oil inlet and an oil outlet of an oil storage tank through a fifth valve bank and an oil inlet and outlet pipeline.
7. The coating line conduction oil central heating system according to claim 1, wherein the flue gas waste heat recovery device is provided with a water regulating valve at a water side, and two ends of the water regulating valve are connected with the hot water supply pipe and the hot water return pipe.
8. The coating line conduction oil central heating system according to claim 1, wherein the conduction oil boiler is provided with a conduction oil regulating valve at a conduction oil side, and both ends of the conduction oil regulating valve are connected to the conduction oil supply pipe and the conduction oil return pipe.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202210100525.7A CN114485139A (en) | 2022-01-27 | 2022-01-27 | Heat conduction oil centralized heating system for coating production line |
CN202320018295.XU CN220083327U (en) | 2022-01-27 | 2023-01-05 | Heat conduction oil central heating system of coating production line |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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CN202210100525.7A CN114485139A (en) | 2022-01-27 | 2022-01-27 | Heat conduction oil centralized heating system for coating production line |
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CN114485139A true CN114485139A (en) | 2022-05-13 |
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CN202210100525.7A Pending CN114485139A (en) | 2022-01-27 | 2022-01-27 | Heat conduction oil centralized heating system for coating production line |
CN202320018295.XU Active CN220083327U (en) | 2022-01-27 | 2023-01-05 | Heat conduction oil central heating system of coating production line |
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CN202320018295.XU Active CN220083327U (en) | 2022-01-27 | 2023-01-05 | Heat conduction oil central heating system of coating production line |
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN201837064U (en) * | 2010-09-14 | 2011-05-18 | 王海波 | Highly-efficiently waste heat recovery system with organic heat carrier boiler |
CN102537917A (en) * | 2012-02-02 | 2012-07-04 | 王海波 | Boiler smoke-gas residual-heat recovering device with temperature regulator |
CN104613747A (en) * | 2015-01-23 | 2015-05-13 | 福建大中城市环保技术有限公司 | Synthetic leather printing line heated by mini-type thermal conductivity oil furnace |
CN106765481A (en) * | 2016-11-28 | 2017-05-31 | 王永娟 | A kind of conduction oil central heating system and energy-saving heating method |
CN209726512U (en) * | 2019-03-13 | 2019-12-03 | 常州能源设备总厂有限公司 | Conduction oil heating system |
-
2022
- 2022-01-27 CN CN202210100525.7A patent/CN114485139A/en active Pending
-
2023
- 2023-01-05 CN CN202320018295.XU patent/CN220083327U/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN201837064U (en) * | 2010-09-14 | 2011-05-18 | 王海波 | Highly-efficiently waste heat recovery system with organic heat carrier boiler |
CN102537917A (en) * | 2012-02-02 | 2012-07-04 | 王海波 | Boiler smoke-gas residual-heat recovering device with temperature regulator |
CN104613747A (en) * | 2015-01-23 | 2015-05-13 | 福建大中城市环保技术有限公司 | Synthetic leather printing line heated by mini-type thermal conductivity oil furnace |
CN106765481A (en) * | 2016-11-28 | 2017-05-31 | 王永娟 | A kind of conduction oil central heating system and energy-saving heating method |
CN209726512U (en) * | 2019-03-13 | 2019-12-03 | 常州能源设备总厂有限公司 | Conduction oil heating system |
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CN220083327U (en) | 2023-11-24 |
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