CN215373662U - Waste heat recovery system - Google Patents
Waste heat recovery system Download PDFInfo
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- CN215373662U CN215373662U CN202121524905.0U CN202121524905U CN215373662U CN 215373662 U CN215373662 U CN 215373662U CN 202121524905 U CN202121524905 U CN 202121524905U CN 215373662 U CN215373662 U CN 215373662U
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Abstract
The utility model discloses a waste heat recovery system, which comprises: energy-saving appliance, heat source aggregate unit, medium source aggregate unit and waste heat recovery controlling means, wherein: the water inlet of the energy saver is connected with a water inlet pipeline, a three-way valve motor is arranged on the water inlet pipeline, a water outlet of the energy saver is connected with a first water outlet pipeline, the energy saver is connected with a hot water boiler through the first water outlet pipeline, a water outlet of the hot water boiler is connected with a second water outlet pipeline, a water inlet of the energy saver is connected with a water inlet pipeline, and a first water pump is arranged on the water inlet pipeline; the heat source linkage device comprises a relay; the medium source linkage device comprises a pressure sensor arranged on the second water outlet pipeline and a temperature sensor arranged on the air inlet pipeline; the waste heat recovery control device is respectively connected with the pressure sensor, the temperature sensor, the relay, the first water pump and the three-way valve motor. The waste heat recovery system is low in cost and reliable in operation, and the heat source system can automatically stop supplying heat to the energy saver when no heated medium is input into the energy saver.
Description
Technical Field
The utility model relates to the technical field of energy recovery, in particular to a waste heat recovery system.
Background
At present, under the form that the environmental protection task is more and more strict, all trades strive towards energy conservation and emission reduction. Waste heat recovery is widely applied by automobile host factories, especially automobile coating workshops, as an energy-saving means with low investment and high profit.
The coating waste heat recovery system is mainly used for recovering heat in waste gas discharged by a drying room and heating boiler hot water or an air conditioning ventilation system, and the heat exchange forms of the coating waste heat recovery system are mainly divided into a gas-liquid type and a gas-gas type. The waste heat recovery system mainly comprises a PLC control system, a water/gas supply system and a heat recovery system, and the most core part of the waste heat recovery system is an energy saver. The energy saver consists of a waste gas three-way valve, fins, a heat pipe, an exhaust valve, a safety valve and the like, and the structure of the energy saver determines that the energy saver cannot be in a dry burning state (dry burning means that a heat source does not stop to provide heat for the energy saver when no heated medium is input into the energy saver, so that the energy saver is high in temperature) for a long time, otherwise, serious and irreversible results can be caused. In order to avoid dry burning of the economizer, the waste heat system is required to be linked with the heat source system and the medium source system, namely, the heat source is cut off when no medium is input into the economizer.
At present, the mainstream method is to transmit a heat source system starting signal and a medium source starting signal to a PLC control system of a waste heat recovery system through an industrial Ethernet technology, and then perform linkage control by a PLC program. The method has the advantages of stability and reliability, and has the defects that network cables among the heat source system, the medium source system and the waste heat system need to be laid, the problem of signal attenuation needs to be considered during long-distance communication, the realization difficulty is high, and the cost is high.
Document CN201620719427.1 discloses a boiler flue gas waste heat recovery system, which comprises a softened water tank, an economizer and a control system, wherein a water inlet of the economizer is connected with a water inlet pipeline, an electromagnetic valve and a first temperature transmitter are sequentially arranged on the water inlet pipeline along a softened water flow path, and a water outlet of the economizer is connected with the softened water tank through a second temperature transmitter pipeline; a liquid level meter is arranged in the soft water tank; the water outlet of the soft water tank is connected with the inlet of the energy saver through a circulating pump and the first temperature transmitter pipeline in sequence; the water outlet of the soft water tank is also connected with a steam boiler through a water feeding pump pipeline; the control system comprises a controller, and the controller is respectively electrically connected with the electromagnetic valve, the first temperature transmitter, the second temperature transmitter, the liquid level meter, the circulating pump and the water feeding pump. This boiler flue gas waste heat recovery system can not prevent that the energy-saving appliance is in the dry combustion method state.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned shortcomings of the prior art, it is an object of the present invention to provide a waste heat recovery system that is low in cost, reliable in operation, and capable of automatically stopping a heat source from supplying heat to an economizer when no heated medium is input to the economizer.
In order to achieve the above object, a first aspect of the present invention provides a waste heat recovery system including:
energy-saving appliance, heat source aggregate unit, medium source aggregate unit and waste heat recovery controlling means, wherein:
the water inlet of the energy saver is connected with a water inlet pipeline, a three-way valve motor is arranged on the water inlet pipeline, a water outlet of the energy saver is connected with a first water outlet pipeline, the energy saver is connected with a hot water boiler through the first water outlet pipeline, a water outlet of the hot water boiler is connected with a second water outlet pipeline, a water inlet of the energy saver is connected with a water inlet pipeline, and a first water pump is arranged on the water inlet pipeline;
the heat source linkage device comprises a relay, and the heat source control device transmits a starting signal of the heat source system to the waste heat recovery control device through the relay;
the medium source linkage device comprises a pressure sensor arranged on the second water outlet pipeline and a temperature sensor arranged on the air inlet pipeline, wherein the pressure sensor is used for acquiring a pressure signal of the second water outlet pipeline and transmitting the pressure signal to the waste heat recovery control device, and the temperature sensor is used for acquiring a temperature signal of the air inlet pipeline and transmitting the temperature signal to the waste heat recovery control device;
the waste heat recovery control device is respectively connected with the pressure sensor, the temperature sensor, the relay, the first water pump and the three-way valve motor, and is used for converting the received pressure signal, temperature signal and starting signal into electric signals after comprehensive analysis and treatment and transmitting the electric signals to the first water pump and the three-way valve motor to control the start and stop of the first water pump and the three-way valve motor;
when the heat source system is started, the heat source control device receives a starting signal, the heat source control device transmits the starting signal to the waste heat recovery control device through the relay, the waste heat recovery control device obtains the starting signal, the heat source system is judged to be started, and the starting condition is met; when the medium source system is started, the medium source system provides water flow for the hot water boiler, a pressure sensor located in a second water outlet pipeline of the hot water boiler acquires a pressure signal and transmits the pressure signal to the waste heat recovery control device, the waste heat recovery control device processes the pressure signal to obtain a pressure value, when the pressure is greater than 0.5bar, the medium source system is judged to be started, the second starting condition is met, and the waste heat recovery system enters a pre-starting mode; when the heat source system is started for a period of time, the heat source system provides a heat source for the energy saver through the air inlet pipeline, the temperature sensor positioned on the air inlet pipeline collects temperature signals and transmits the temperature signals to the waste heat recovery control device, the waste heat recovery control device obtains temperature values after processing, when the temperature values exceed 120 ℃, the waste heat recovery control device judges that the starting temperature is reached, the starting condition three is met, after the starting conditions one, two and three are met simultaneously, the waste heat recovery system is formally started and operated, and the heat source system heats the energy saver.
Optionally, the water outlet of the hot water boiler is connected with a heat exchanger of a coating workshop through a second water outlet pipeline, the pressure sensor is arranged at a position close to the heat exchanger of the coating workshop, only a short circuit needs to be laid between the pressure sensor and the waste heat recovery control device, the cost is saved, and the signal attenuation is reduced.
Optionally, a water inlet of the economizer is connected with a heat exchanger of the coating workshop through a water inlet pipeline, and the first water pump can convey liquid discharged from the heat exchanger of the coating workshop to the economizer through the water inlet pipeline.
Optionally, a second water pump is arranged on the second water outlet pipeline, and the second water pump can deliver the liquid discharged by the hot water boiler to the heat exchanger of the coating workshop through the second water outlet pipeline.
Optionally, a gas outlet of the economizer is connected with a gas outlet pipeline, and gas entering the economizer exchanges heat with the economizer and then is discharged out of the waste heat recovery system along the gas outlet pipeline.
Optionally, the economizer is connected with a waste gas fan through an air inlet pipeline, and the waste gas fan transmits the high-temperature waste gas to the economizer through the air inlet pipeline.
Optionally, the relay adopts a model 3TX7004-1LF00 sheet relay, the coil of the relay is compatible with 24V/220V, and the relay has a group of normally open contacts and a group of normally closed contacts, so that the relay has the advantages of strong universality, small installation space, long service life, low price and the like.
Optionally, the pressure sensor adopts the specification of 0-1.0Mpa, and has the advantages of long service life, stability and reliability.
The utility model has the beneficial effects that:
1. the utility model needs less functional hardware, can realize linkage function only by three components, namely a temperature sensor, a pressure sensor and a relay, and has low equipment maintenance cost;
2. the air inlet pipeline of the energy saver is provided with a three-way valve motor, when no heated medium is input into the energy saver, the three-way valve motor receives a signal from the waste heat recovery control device, the three-way valve motor converts gears to prevent a heat source from entering the energy saver, and the heat source stops providing heat for the energy saver, namely, the energy saver is prevented from being dried;
3. the pressure sensor is arranged near the waste heat recovery control device, the problem that a large number of hardware facilities such as network cables, switches, bridges, power supplies and the like need to be erected during long-distance communication is solved, the hardware investment is low, and the waste heat recovery control device has the advantages of low manufacturing cost and high economic value.
Additional features and advantages of the utility model will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model without limiting the utility model. In the drawings:
FIG. 1 illustrates a schematic diagram of a waste heat recovery system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the waste heat recovery system when the heat source system is heating the economizer;
FIG. 3 is a schematic diagram of the waste heat recovery system when the heat source system is not heating the economizer;
fig. 4 is a schematic structural diagram of a conventional waste heat recovery system.
Description of the reference numerals
11-a heat source control device; 12-a relay; 21-a pressure sensor; 22-a hot water boiler; 23-an economizer; 24-a paint shop heat exchanger; 25-three-way valve motor; 26-a waste gas fan; 27-a temperature sensor; 281-a first water pump; 282-a second water pump; 291-water inlet pipe; 292-a first outlet conduit; 293-second water outlet pipeline; 294 — an intake line; 295-gas outlet pipeline; 3-a waste heat recovery control device; 11' -a heat source control device; 2' -a media source control device; 3' -a waste heat recovery control device; 5-a communication module; 6-switch.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
A specific embodiment of the present invention provides a waste heat recovery system, referring to fig. 1, including: the heat source linkage device, the medium source linkage device and the waste heat recovery control device 3 are characterized in that an air inlet of the energy saver 23 is connected with an air inlet pipeline 294, the air inlet pipeline 294 is provided with a temperature sensor 27 and a three-way valve motor 25, a water outlet of the energy saver 23 is connected with a first water outlet pipeline 292, the energy saver 23 is connected with a hot water boiler 22 through the first water outlet pipeline 292, a water outlet of the hot water boiler 22 is connected with a second water outlet pipeline 293, the second water outlet pipeline 293 is provided with a pressure sensor 21, a water inlet of the energy saver 23 is connected with a water inlet pipeline 291, and the water inlet pipeline 291 is provided with a first water pump 281.
A water outlet of the hot water boiler 22 is connected with a second water outlet pipeline 293, the second water outlet pipeline 293 is provided with a pressure sensor 21, when the hot water boiler 22 is not started, the pressure of water in the second water outlet pipeline 293 is 0-0.5bar, because the pressure is generated by the gravity of the water, the pressure sensor 21 collects a pressure signal and transmits the signal to the waste heat recovery control device 3, the waste heat recovery control device 3 can judge that the hot water boiler 22 is not started, the waste heat recovery control device 3 transmits the signal to a three-way valve motor 25 on an air inlet pipeline 294 of the energy saver 23, and the three-way valve motor 25 prevents a heat source from entering the energy saver 23 to prevent dry combustion of the energy saver 23; when the hot water boiler 22 is started, the pressure of the water flow in the second water outlet pipe 293 will be greater than 0.5bar, which is because the pressure is generated by the flow of water, the pressure sensor 21 located in the second water outlet pipe 293 collects a pressure signal and transmits the signal to the waste heat recovery control device 3, the waste heat recovery control device 3 processes the pressure signal to obtain a pressure value, when the pressure value is greater than 0.5bar, the waste heat recovery control device 3 determines that the hot water boiler 22 is started, the waste heat recovery control device 3 transmits the signal to the three-way valve motor 24, and the three-way valve motor 24 opens the air inlet pipe 294 between the exhaust gas fan 26 and the economizer 23; thus, the pressure sensor 21 is provided in the second water outlet line 293 of the hot water boiler 22, and the automatic control of the waste heat recovery system can be realized by detecting the pressure of the water flow in the second water outlet line 293.
The heat source linkage device comprises a relay 12, a heat source control device 11 transmits a starting signal of a heat source system to the waste heat recovery control device 3 through the relay 12, after the heat source system is started, the heat source control device 11 obtains the starting signal, a coil of the relay 12 connected with the heat source control device 11 is electrified, a normally open contact is closed, the heat source control device 11 can transmit the starting signal to the waste heat recovery control device 3, and the waste heat recovery control device 3 judges that the heat source system is started.
The medium source linkage device comprises a pressure sensor 21 and a temperature sensor 27, the pressure sensor 21 is used for collecting a pressure signal of the second water outlet pipeline 293 and transmitting the pressure signal to the waste heat recovery control device 3, and the temperature sensor 27 is used for collecting a temperature signal of the air inlet pipeline 294 and transmitting the temperature signal to the waste heat recovery control device 3; when the medium source system is started, the medium source system provides water flow for the hot water boiler 22, due to the flow of the water flow, pressure formed by the water flow exists in the water outlet pipe 293 of the hot water boiler 22, the pressure sensor 21 is arranged on the second water outlet pipe 293 of the hot water boiler 22, the pressure sensor 21 collects a pressure signal and transmits the pressure signal to the waste heat recovery control device 3, the waste heat recovery control device 3 processes the pressure signal to obtain a current pressure value, and when the pressure value is greater than 0.5bar, the waste heat recovery control module 3 judges that the medium source system is started.
The temperature sensor 27 collects a temperature signal and transmits the temperature signal to the waste heat recovery control device 3, when the heat source system is started for a period of time, the temperature of air in the heat source system gradually rises, the heat source system transmits the heat source to the economizer 23 through the air inlet pipeline 294, the temperature sensor 27 is arranged on the air inlet pipeline 294 of the economizer 23, the temperature sensor 27 collects a temperature signal on the air inlet pipeline 294 and transmits the temperature signal to the waste heat recovery control device 3, the waste heat recovery device 3 converts the temperature signal into a temperature value, and when the waste heat recovery control device 3 detects that the temperature value exceeds 120 ℃, the waste heat recovery control device 3 judges that the heat source system reaches the starting temperature.
When the heat source system is started, the heat source control device 11 transmits a starting signal to the waste heat recovery control device 3 through the relay 12, a coil of the relay 12 connected with the heat source control device 11 is electrified, the normally open contact is closed, the waste heat recovery control device 3 obtains a signal, the heat source system is judged to be started, and the starting condition is met; when the medium source system is started, the medium source system provides water flow for the hot water boiler 22, the pressure sensor 21 located in the second water outlet pipeline 293 of the hot water boiler 22 collects pressure signals and transmits the pressure signals to the waste heat recovery control device 3, the waste heat recovery control device 3 processes the pressure signals to obtain a pressure value, when the pressure is greater than 0.5bar, the medium source system is judged to be started, the starting condition II is met, and the waste heat recovery system enters a pre-starting mode; after the heat source system is started for a period of time, the heat source system provides a heat source for the economizer 23 through the air inlet pipeline 294, the temperature sensor 27 located in the air inlet pipeline 294 collects a temperature signal and transmits the temperature signal to the waste heat recovery control device 3, the waste heat recovery control device 3 obtains a temperature value after processing, when the temperature value exceeds 120 ℃, the waste heat recovery control device 3 judges that the starting temperature is reached, the starting condition three is met, after the starting conditions one, two and three are met simultaneously, the waste heat recovery system is formally started to operate, and the heat source system heats the economizer 23.
When the first, second, and third start conditions are met simultaneously, as shown in fig. 2, the waste heat recovery control device 3 is connected to the first water pump 281 and the three-way valve motor 25, the waste heat recovery control device 3 transmits an electrical signal to the first water pump 281 and the three-way valve motor 25, the first water pump 281 is turned on to supply water flow to the economizer 23, the three-way valve motor 25 turns on a channel between the waste fan 26 and the economizer 23, and waste gas sent by the waste gas fan 26 can heat fluid in the economizer 23.
When the first, second, and third start conditions are not met simultaneously, as shown in fig. 3, when the pressure sensor 21 detects that the pressure is lower than 0.5bar, the heat recovery control module 3 transmits the electric signal to the first water pump 281 and the three-way valve motor 25, the first water pump 281 is turned off to stop supplying water to the economizer 23, the three-way valve motor 23 closes the passage between the exhaust gas fan 26 and the economizer 23, and the exhaust gas is directly discharged out of the workshop, so that dry burning of the economizer 23 is avoided.
In the embodiment of the present application, the water outlet of the hot water boiler 22 is connected to the coating shop heat exchanger 24 through the second water outlet pipe 293, so that the liquid discharged from the hot water boiler 22 can be sent to the coating shop heat exchanger 24 through the second water outlet pipe 293.
In addition, the pressure sensor 21 is arranged near the coating shop heat exchanger 24, and in the prior art, referring to fig. 4, the distances between the heat source control device 11 ', the medium source control device 2 ' and the waste heat recovery control device 3 ' are often far, so that a long-distance network cable, a large number of communication modules 5 and switches 6 need to be laid, and during long-distance communication, the problem of signal attenuation needs to be considered, so that the implementation difficulty is high, the cost is high, the pressure sensor 21 of the application is arranged near the coating shop heat exchanger 24, and the coating shop heat exchanger 24 is close to the waste heat recovery control device 3, so that only a short line needs to be laid between the pressure sensor 21 and the waste heat recovery control device 3, the cost is saved, and the signal attenuation is reduced.
In the embodiment of the application, the water inlet of the economizer 23 is connected with the paint shop heat exchanger 24 through the water inlet pipe 291, the water inlet pipe 291 is provided with a first water pump 281, and the first water pump 281 can supply the liquid discharged from the paint shop heat exchanger 24 to the economizer 23 through the water inlet pipe 291. The first water pump 281 can receive a signal from the heat recovery control device 3, when fluid flows in the second water outlet line 293, the pressure sensor 21 transmits the pressure signal to the heat recovery control device 3, the heat recovery control device 3 determines that the hot water boiler 22 is started, and the heat recovery control device 3 controls the first water pump 281 to be started.
In the embodiment of the present application, the second water pump 282 is disposed on the second water outlet pipe 293, and after the hot water boiler 22 is started, the second water pump 282 is started, and the second water pump 282 can deliver the liquid discharged by the hot water boiler 22 to the coating workshop heat exchanger 24 through the second water outlet pipe 293.
In the embodiment of the application, the gas outlet of the economizer 23 is connected with the gas outlet pipeline 295, a heat source can enter the economizer 23 through the gas inlet pipeline 294 to heat the economizer 23, and the gas entering the economizer 23 is subjected to heat exchange with the economizer 23 and then discharged out of the waste heat recovery system along the gas outlet pipeline 295.
In the embodiment of this application, economizer 23 is connected with exhaust fan 26 through air inlet pipeline 294, and exhaust fan 26 transmits high temperature waste gas for economizer 23 through air inlet pipeline 294, because be equipped with temperature sensor 27 and three-way valve motor 25 on the air inlet pipeline 294, temperature sensor 27 can be arranged in gathering the signal of the temperature of air in air inlet pipeline 294 and in time convey this signal to waste heat recovery controlling means 3, and three-way valve motor 25 can receive the signal that comes from waste heat recovery controlling means 3.
In the embodiment of the application, the relay 12 is a sheet type relay of type 3TX7004-1LF00, the relay 4 is a Siemens brand, the coil of the relay is compatible with 24V/220V, and the relay has a group of normally open contacts and a group of normally closed contacts, and has the advantages of strong universality, small installation space, long service life, low price and the like.
In the embodiment of the application, the pressure sensor 21 adopts the specification of 0-1.0Mpa, adopts a brand Shanghai self-meter, and has the advantages of long service life, stability and reliability.
It is to be understood by those skilled in the art that the foregoing general description and the following detailed description are exemplary and explanatory of specific embodiments of the utility model, and are not intended to limit the utility model.
The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process or method that comprises a list of steps does not include only those steps, but may include other steps not expressly listed or inherent to such process or method. Also, without further limitation, one or more devices or subsystems, elements or structures or components beginning with "comprise. The appearances of the phrases "in one embodiment," "in another embodiment," and similar language throughout this specification may, but do not necessarily, all refer to the same embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It should be understood that the technical solutions and the inventive concepts according to the present invention may be equally replaced or changed by those skilled in the art, and all such changes or substitutions should fall within the protection scope of the appended claims.
Claims (8)
1. A waste heat recovery system, comprising: the energy-saving device (23), the heat source linkage device, the medium source linkage device and the waste heat recovery control device (3);
an air inlet of the economizer (23) is connected with an air inlet pipeline (294), a three-way valve motor (25) is arranged on the air inlet pipeline (294), a water outlet of the economizer (23) is connected with a first water outlet pipeline (292), the economizer (23) is connected with a hot water boiler (22) through the first water outlet pipeline (292), a water outlet of the hot water boiler (22) is connected with a second water outlet pipeline (293), a water inlet of the economizer (23) is connected with a water inlet pipeline (291), and a first water pump (281) is arranged on the water inlet pipeline (291);
the heat source linkage device comprises a relay (12), and the heat source control device (11) transmits a starting signal of a heat source system to the waste heat recovery control device (3) through the relay (12);
the medium source linkage device comprises a pressure sensor (21) arranged on the second water outlet pipeline (293) and a temperature sensor (27) arranged on the air inlet pipeline (294), wherein the pressure sensor (21) is used for collecting a pressure signal of the second water outlet pipeline (293) and transmitting the pressure signal to the waste heat recovery control device (3), and the temperature sensor (27) is used for collecting a temperature signal of the air inlet pipeline (294) and transmitting the temperature signal to the waste heat recovery control device (3);
the waste heat recovery control device (3) is respectively connected with the pressure sensor (21), the temperature sensor (27), the relay (12), the first water pump (281) and the three-way valve motor (25) and used for converting received pressure signals, temperature signals and starting signals into electric signals after comprehensive analysis and processing and transmitting the electric signals to the first water pump (281) and the three-way valve motor (25) to control the starting and stopping of the first water pump (281) and the three-way valve motor (25).
2. A waste heat recovery system according to claim 1, wherein the water outlet of the hot water boiler (22) is connected to a paint shop heat exchanger (24) via the second water outlet line (293), and the pressure sensor (21) is arranged close to the paint shop heat exchanger (24).
3. A waste heat recovery system according to claim 2, characterized in that the water inlet of the economizer (23) is connected to the paint shop heat exchanger (24) via the water inlet line (291).
4. A heat recovery system according to claim 1, wherein a second water pump (282) is provided on the second water outlet line (293).
5. A waste heat recovery system according to claim 1, characterized in that the outlet of the economizer (23) is connected with an outlet pipeline (295).
6. A waste heat recovery system according to claim 1, characterized in that the economizer (23) is connected to a waste gas fan (26) via the inlet line (294).
7. A heat recovery system as claimed in claim 1, characterized in that the relay (12) is a type 3TX7004-1LF00 sheet relay.
8. A waste heat recovery system according to claim 1, characterized in that the pressure sensor (21) is of the size 0-1.0 Mpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121524905.0U CN215373662U (en) | 2021-07-06 | 2021-07-06 | Waste heat recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121524905.0U CN215373662U (en) | 2021-07-06 | 2021-07-06 | Waste heat recovery system |
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| Publication Number | Publication Date |
|---|---|
| CN215373662U true CN215373662U (en) | 2021-12-31 |
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| CN202121524905.0U Active CN215373662U (en) | 2021-07-06 | 2021-07-06 | Waste heat recovery system |
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| CN (1) | CN215373662U (en) |
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2021
- 2021-07-06 CN CN202121524905.0U patent/CN215373662U/en active Active
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