CN111578730A - Flue gas waste heat recovery device and recovery system for blast furnace - Google Patents
Flue gas waste heat recovery device and recovery system for blast furnace Download PDFInfo
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- CN111578730A CN111578730A CN202010569230.5A CN202010569230A CN111578730A CN 111578730 A CN111578730 A CN 111578730A CN 202010569230 A CN202010569230 A CN 202010569230A CN 111578730 A CN111578730 A CN 111578730A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G1/00—Non-rotary, e.g. reciprocated, appliances
- F28G1/02—Non-rotary, e.g. reciprocated, appliances having brushes
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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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- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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- Sustainable Development (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention relates to the technical field of metal smelting, in particular to a flue gas waste heat recovery device for a blast furnace; the adopted technical scheme is as follows: a flue gas waste heat recovery device for a blast furnace comprises a recovery device body, wherein a flue gas cavity, an air cavity and a plurality of heat pipes are arranged in the recovery device body; the hot end of the heat pipe is positioned in the smoke cavity, and the cold end of the heat pipe is positioned in the air cavity; a dust scraping plate is arranged in the smoke cavity, the dust scraping plate is provided with a plurality of dust scraping holes, and the hot end of the heat pipe is inserted into the dust scraping holes; the dust scraper is characterized by further comprising a linear driver, and the linear driver is used for driving the dust scraper to move along the length direction of the heat pipe. The invention transfers the heat of the flue gas to the blast furnace through the heat pipe to intake air, can improve the combustion efficiency of the blast furnace and realize the recovery of the waste heat of the flue gas, and has the characteristics of economy and environmental protection. And the dust scraping plate is driven by the linear driver to scrape off dust attached to the hot end of the heat pipe, so that the normal heat conduction of the heat pipe can be ensured, the shutdown maintenance is not needed, and the production efficiency is high.
Description
Technical Field
The invention relates to the technical field of metal smelting, in particular to a flue gas waste heat recovery device and a recovery system for a blast furnace.
Background
Blast furnaces, which are generally non-ferrous metal smelting shaft furnaces, have the characteristics of high thermal efficiency, high unit productivity (bed capacity), high metal recovery rate, low cost, small occupied area and the like, and are one of important smelting devices for pyrometallurgy. The charge of a blast furnace is generally in the form of blocks and the fuel is coke. Charging materials are added from the top of the furnace in batches to form a material column. Air is blown in from a lower air port, and coke is combusted in the air port area to form a high-temperature smelting area; the charge reacts violently and melts continuously. During reduction smelting, the melt is clarified in a hearth to respectively discharge metal and slag, and during matte smelting, the melt flows into a front bed through the front bed to clarify and separate matte and slag. The hot flue gas rises through the furnace burden to the top of the furnace and is discharged, so that the furnace burden is preheated (when the kneaded concentrate is smelted, the concentrate is sintered), and partial smelting chemical reaction occurs.
The flue gas of the existing blast furnace is directly discharged into the air after being dedusted by a gravity deduster, which causes air pollution and waste of heat energy. Aiming at the problem, a blast furnace flue gas waste heat recovery device is not provided, but dust in flue gas is easy to attach to the surface of a heat exchange part of a heat exchanger if dust removal treatment is not carried out firstly, so that the heat exchange efficiency is low, the flue gas waste heat is fully recovered, frequent maintenance is required, and the maintenance frequency is high; if the mode of dust removal is adopted, the high-temperature gas exchanges heat with the dust remover firstly, and the waste heat of the flue gas of the blast furnace is difficult to be fully recovered.
Disclosure of Invention
Aiming at the technical problems that the flue gas waste heat of the existing blast furnace cannot be fully recovered and the maintenance frequency is high, the invention provides the flue gas waste heat recovery device and the flue gas waste heat recovery system for the blast furnace, which can fully recover the flue gas of the blast furnace, do not need to be shut down for maintenance and have the characteristics of economy and environmental protection.
The invention is realized by the following technical scheme:
a flue gas waste heat recovery device for a blast furnace comprises a recovery device body, wherein a flue gas cavity, an air cavity and a plurality of heat pipes are arranged in the recovery device body; the smoke cavity is provided with a smoke inlet and a smoke outlet, and the air cavity is provided with an air inlet and an air outlet; the hot end of the heat pipe is positioned in the smoke cavity, and the cold end of the heat pipe is positioned in the air cavity; a dust scraping plate is arranged in the smoke cavity, the dust scraping plate is provided with a plurality of dust scraping holes, and the hot end of the heat pipe is inserted into the dust scraping holes; the dust scraper is characterized by further comprising a linear driver, and the linear driver is used for driving the dust scraper to move along the length direction of the heat pipe.
When the flue gas recovery device is used, the flue gas of the blast furnace is introduced into the flue gas cavity, the air outlet of the cavity is connected with the air inlet end of the blast furnace blower, and the heat of the flue gas is transferred to the air through the heat pipe, so that the inlet air of the blast furnace blower is heated, the combustion efficiency of the blast furnace is improved, the recovery of the waste heat of the flue gas is realized, and the flue gas recovery device has the characteristics of economy and environmental protection. In addition, the hot end of the heat pipe is inserted into the dust scraping hole, the dust scraping plate is driven by the linear driver to move along the length direction of the heat pipe, and dust attached to the hot end of the heat pipe is scraped, so that the heat conduction of the heat pipe is normally carried out, the shutdown maintenance is not needed, and the production efficiency is high.
Further, an air cavity dividing part is arranged in the air cavity; the air cavity is divided into an air inlet cavity and an air outlet cavity by the air cavity dividing part, and the cold end of the heat pipe is positioned in the air inlet cavity; and one end of the air inlet cavity, which is far away from the air inlet, is communicated with one end of the air outlet cavity, which is far away from the air outlet. So that the air chamber is filled with the air extracted by the blast furnace blower, and the cold end of the heat pipe is fully cooled, and the combustion-supporting gas sent into the blast furnace has enough initial temperature, thereby ensuring the smelting efficiency of the blast furnace.
Further, a smoke cavity partition part is arranged in the smoke cavity; the smoke cavity is divided into a smoke inlet cavity and a smoke outlet cavity by the smoke cavity dividing part, and the hot end of the heat pipe and the dust scraping plate are both positioned in the smoke inlet cavity; the end of the smoke inlet cavity far away from the smoke inlet is communicated with the end of the smoke outlet cavity far away from the smoke outlet. So that the flue gas and the heat pipe are discharged after sufficient heat exchange, and the recovery efficiency of the flue gas waste heat is improved.
As a specific embodiment of the linear actuator, the linear actuator comprises a piston cylinder and a return spring; a piston is matched in the piston cylinder, the piston is connected with the dust scraping plate, and a working medium is filled in the piston cylinder; the piston is driven to move through expansion of the working medium, and the return spring is used for driving the piston to return. The automatic operation of the linear driver is realized through the combined action of the thermal expansion cold shrinkage and the reset spring of the working medium in the piston cylinder, the structure is simple, the linear driver does not need to be controlled and manually operated, the energy is not additionally consumed, the utilization rate of the flue gas waste heat is further provided, and the economical efficiency and the environmental protection performance of the device are ensured.
As a specific embodiment for installing the return spring, the return spring is arranged in the piston cylinder so as to ensure the action reliability of the return spring.
As a specific implementation mode for installing the piston cylinder, one end of the piston cylinder for containing the working medium is arranged in the air outlet end of the flue gas outlet cavity, so that the flue gas waste heat can be fully recovered.
Preferably, the working medium is mercury so as to ensure the heat sensitivity of the linear driver, further scrape dust on the heat pipe in real time and ensure the normal work of the heat pipe.
Preferably, the dust scraping brush is arranged in the dust scraping hole, so that the cleanness of the heat pipe can be ensured; on the other hand, the abrasion of the heat pipe is reduced to ensure the service life of the device.
The invention also provides a flue gas waste heat recovery system for the blast furnace, which comprises the flue gas waste heat recovery device for the blast furnace.
Preferably, the air outlet end of the smoke cavity is connected with a dust remover to prevent dust in smoke from being discharged to pollute air.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention transfers the heat of the flue gas to the inlet air of the blower of the blast furnace through the heat pipe, thereby improving the combustion efficiency of the blast furnace, realizing the recovery of the waste heat of the flue gas and having the characteristics of economy and environmental protection.
2. The hot end of the heat pipe is inserted in the dust scraping hole, the dust scraping plate is driven by the linear driver to move along the length direction of the heat pipe, and dust attached to the hot end of the heat pipe is scraped, so that the heat conduction of the heat pipe is normally carried out, the shutdown maintenance is not needed, and the production efficiency is high.
3. The end of the air inlet cavity, which is far away from the air inlet, is communicated with the end of the air outlet cavity, which is far away from the air outlet; so that the air chamber is filled with the air extracted by the blast furnace blower, and the cold end of the heat pipe is fully cooled, and the combustion-supporting gas sent into the blast furnace has enough initial temperature, thereby ensuring the smelting efficiency of the blast furnace.
4. The end of the smoke inlet cavity, which is far away from the smoke inlet, is communicated with the end of the smoke outlet cavity, which is far away from the smoke outlet; so that the flue gas and the heat pipe are discharged after sufficient heat exchange, and the recovery efficiency of the flue gas waste heat is improved.
5. The automatic operation of the linear actuator is realized through the combined action of the thermal expansion cold shrinkage and the reset spring of the working medium in the piston cylinder, the structure is simple, the linear actuator does not need to be controlled and manually operated, the energy is not additionally consumed, the utilization rate of the flue gas waste heat is further increased, and the economical efficiency and the environmental protection performance of the device can be ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is an enlarged view of a portion a of fig. 1.
Reference numbers and corresponding part names in the drawings:
1-body, 2-smoke air cavity, 3-air cavity, 4-heat pipe, 5-dust scraping plate, 6-dust scraping hole, 7-dust scraping brush, 8-linear driver, 9-air cavity division part, 10-air cavity air inlet cavity, 11-air cavity air outlet cavity, 12-air inlet, 13-air outlet, 14-smoke cavity division part, 15-smoke inlet cavity, 16-smoke outlet cavity, 17-smoke inlet, 18-smoke outlet, 19-piston cylinder, 20-piston, 21-piston rod, 22-reset spring, 23-working medium and 30-isolation body.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
The utility model provides a flue gas waste heat recovery device for blast furnace, includes recovery unit body 1, be equipped with flue gas chamber 2, air chamber 3 and a plurality of heat pipe 4 in the body 1. Specifically, the body 1 has a cavity therein, and the cavity inside the body 1 is divided into an air cavity 3 and a smoke cavity 2 by a partition 30.
The flue gas chamber 2 is provided with a flue gas inlet 17 and a flue gas outlet 18, the flue gas inlet 17 is used for being connected with a blast furnace gas outlet or a blower gas outlet end connected with the blast furnace gas outlet end, and in order to increase the retention time of the flue gas in the flue gas chamber 2, a backpressure element or structure, such as a backpressure valve, a damping hole and the like, can be arranged on the flue gas outlet 18 or a pipeline connected with the flue gas outlet 18.
The air cavity 3 is provided with an air inlet 12 and an air outlet 13, and the air outlet 13 is used for connecting the air inlet end of a blast furnace blower.
The hot end of the heat pipe 4 is positioned in the smoke air cavity 2, the cold end of the heat pipe 4 is positioned in the air cavity 3, that is, the middle part of the heat pipe 4 is inserted on the partition 30, one end (hot end) of the heat pipe 4 is positioned in the smoke air cavity 2, and the other end (cold end) of the heat pipe 4 is positioned in the air cavity.
A dust scraping plate 5 is arranged in the smoke air cavity 2, a plurality of dust scraping holes 6 are formed in the dust scraping plate 5, and the hot end of the heat pipe 4 is inserted into the dust scraping holes 6. The recovery device further comprises a linear driver 8, and the linear driver 8 is used for driving the dust scraping plate 5 to move along the length direction of the heat pipe 4.
The linear driver 8 may be a hydraulic cylinder/pneumatic cylinder, an electric push rod, or a rack and pinion mechanism, a lead screw slider mechanism, a crank slider mechanism, etc. driven by a motor.
In the embodiment, the linear driver 8 comprises a piston cylinder 19 and a return spring 22, a piston 20 and a piston rod 21 are adapted in the piston cylinder 19, and the piston 20 is connected with the dust scraper 5; that is, one end of the piston rod 21 is connected to the piston 20, and the other end of the piston rod 21 is connected to the dust scraping plate 5. Working medium 23 is arranged in the piston cylinder 19, the piston 20 is driven to move through expansion of the working medium 23, and the return spring is used for driving the piston to return.
It can be understood that the return spring 22 and the working medium 23 can be located on both sides of the piston 20, or on the same side of the piston 20; in order to ensure the reliability of the action of the return spring 22, the return spring 22 is arranged in the piston cylinder 19 and sleeved outside the piston rod 21.
In order to ensure that the residual heat of the flue gas can be fully recovered, one end of the piston cylinder 19, which is used for containing the working medium 23, is arranged in the gas outlet end of the flue gas cavity 2.
Preferably, the working medium 23 is mercury to ensure the heat sensitivity of the linear driver 8, so as to scrape dust on the heat pipe 4 in real time and ensure the normal operation of the heat pipe 4.
Preferably, a dust scraping brush 7 is arranged in the dust scraping hole 6, so that the cleanliness of the heat pipe 4 can be ensured; on the other hand, reduces the wear of the heat pipe 4 to ensure the service life of the device. It should be noted that the dust scraping brush 7 is made of a high-temperature-resistant nylon non-metallic material, or is made of an elastic metal wire.
To reduce the load on the linear drive 8, the dust scraper 5 is made of a lightweight material, such as foam steel, aluminum box, or the like.
Example 2
According to embodiment 1, an air cavity dividing part 9 is arranged in the air cavity 3; the air chamber dividing portion 9 divides the air chamber 3 into an air intake chamber 10 and an air exhaust chamber 11.
Correspondingly, the air inlet 12 is arranged on the side wall of the air inlet cavity 10, the air outlet 13 is arranged on the side wall of the air outlet cavity 11, and the cold end of the heat pipe 4 is located in the air inlet cavity 10.
One end of the air inlet cavity 10, which is far away from the air inlet 12, is communicated with one end of the air outlet cavity 11, which is far away from the air outlet 13; so that the air chamber 3 is filled with the air extracted by the blast furnace blower, and then the cold end of the heat pipe 4 is fully cooled, and the combustion-supporting gas sent into the blast furnace has enough initial temperature, so as to ensure the smelting efficiency of the blast furnace.
In order to prevent the air in the air inlet chamber 10 and the air outlet chamber 11 from exchanging heat, the air chamber dividing portion 9 is made of a heat insulating material or a heat insulating structure such as a heat insulating brick, a double vacuum panel, or the like.
Example 3
Based on embodiment 1 or 2, a smoke cavity dividing part 14 is arranged in the smoke cavity 2; the flue gas cavity dividing part 14 divides 2 the flue gas cavity into a flue gas inlet cavity 15 and a flue gas outlet cavity 16.
Correspondingly, the flue gas inlet 17 is arranged on the side wall of the flue gas inlet cavity 15, the flue gas outlet 18 is arranged on the side wall of the flue gas outlet cavity 16, the hot end of the heat pipe 4 is positioned in the flue gas inlet cavity 10, and the dust scraping plate 5 is also positioned in the flue gas inlet cavity 15.
The end of the flue gas inlet cavity 15 far away from the flue gas inlet 17 is communicated with the end of the flue gas outlet cavity 16 far away from the flue gas outlet 18; so that the flue gas is discharged after being subjected to sufficient heat exchange with the heat pipe 4, and the recovery efficiency of the flue gas waste heat is further improved.
In order to prevent the heat exchange between the gas in the flue gas inlet cavity 15 and the gas in the flue gas outlet cavity 16, the flue gas cavity partition 14 is made of a heat insulating material or has a heat insulating structure, such as a heat insulating brick, a double-layer vacuum plate, or the like.
Example 4
The invention also provides a flue gas waste heat recovery system for the blast furnace, which comprises the flue gas waste heat recovery device for the blast furnace.
It should be understood that the flue gas inlet 17 is connected to the blast furnace gas outlet or to the blower gas outlet connected to the blast furnace gas outlet; the flue gas outlet 18 is connected with a dust remover, such as a cyclone dust remover, a bag-type dust remover and the like.
Namely, the air outlet end of the smoke air cavity 2 is connected with a dust remover to prevent dust in smoke from being discharged to pollute air. And the air outlet end of the dust remover can be connected with a flue gas absorption tower and the like, so that the air pollution caused by the flue gas of the air blower is prevented.
Meanwhile, the air outlet 13 is connected with the air inlet end of the blast furnace blower so as to send air into the blast furnace through the blast furnace blower after passing through the air cavity 3, thereby improving the combustion efficiency of the blast furnace and realizing the recovery of the waste heat of the flue gas. To ensure the combustion efficiency of the blast furnace, an oxygen cylinder may be connected between the air outlet 13 and the blast furnace blower.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A flue gas waste heat recovery device for a blast furnace is characterized by comprising a recovery device body (1), wherein a flue gas cavity (2), an air cavity (3) and a plurality of heat pipes (4) are arranged in the body (1);
the smoke cavity (2) is provided with a smoke inlet (17) and a smoke outlet (18), and the air cavity (3) is provided with an air inlet (12) and an air outlet (13);
the hot end of the heat pipe (4) is positioned in the smoke gas cavity (2), and the cold end of the heat pipe (4) is positioned in the air cavity (3);
a dust scraping plate (5) is arranged in the smoke gas cavity (2), the dust scraping plate (5) is provided with a plurality of dust scraping holes (6), and the hot end of the heat pipe (4) is inserted in the dust scraping holes (6);
the dust scraper is characterized by further comprising a linear driver (8), wherein the linear driver (8) is used for driving the dust scraper (5) to move along the length direction of the heat pipe (4).
2. The flue gas waste heat recovery device for a blast furnace of claim 1, wherein an air chamber partition (9) is provided in the air chamber (3);
the air cavity dividing part (9) divides the air cavity (3) into an air inlet cavity (10) and an air outlet cavity (11), and the cold end of the heat pipe (4) is positioned in the air inlet cavity (10);
one end of the air inlet cavity (10) far away from the air inlet (12) is communicated with one end of the air outlet cavity (11) far away from the air outlet (13).
3. The flue gas waste heat recovery device for a blast furnace of claim 2, wherein a flue gas cavity partition (14) is provided in the flue gas cavity (2);
the smoke gas cavity dividing part (14) divides the smoke gas cavity (2) into a smoke gas inlet cavity (15) and a smoke gas outlet cavity (16), and the hot end of the heat pipe (4) and the dust scraping plate (5) are both positioned in the smoke gas inlet cavity (15);
and one end of the smoke inlet cavity (15) far away from the smoke inlet (17) is communicated with one end of the smoke outlet cavity (16) far away from the smoke outlet (18).
4. The flue gas waste heat recovery device for a blast furnace according to claim 3, wherein the linear actuator (8) comprises a piston cylinder (19) and a return spring (22);
a piston (20) is adapted in the piston cylinder (19), the piston (20) is connected with the dust scraping plate (5), and a working medium (23) is arranged in the piston cylinder (19);
the piston (20) is driven to move through expansion of the working medium (23), and the return spring (22) is used for driving the piston (20) to return.
5. The flue gas waste heat recovery device for a blast furnace of claim 4, wherein the return spring (22) is arranged inside a piston cylinder (19).
6. The flue gas waste heat recovery device for blast furnaces as claimed in claim 4, wherein one end of the piston cylinder (19) containing the working medium (23) is arranged in the outlet end of the flue gas outlet cavity (16).
7. The flue gas waste heat recovery device for blast furnaces as claimed in claim 4, characterised in that the working medium (23) is mercury.
8. The flue gas waste heat recovery device for a blast furnace of any one of claims 1 to 7, wherein a dust scraping brush (7) is arranged inside the dust scraping hole (6).
9. A flue gas waste heat recovery system for a blast furnace, characterized by comprising the flue gas waste heat recovery device for a blast furnace of any one of claims 1 to 8.
10. The flue gas waste heat recovery system for a blast furnace of any one of claims 9, wherein a dust remover is connected to the outlet end of the flue gas chamber (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010569230.5A CN111578730A (en) | 2020-06-20 | 2020-06-20 | Flue gas waste heat recovery device and recovery system for blast furnace |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010569230.5A CN111578730A (en) | 2020-06-20 | 2020-06-20 | Flue gas waste heat recovery device and recovery system for blast furnace |
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| CN111578730A true CN111578730A (en) | 2020-08-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112944968A (en) * | 2021-01-08 | 2021-06-11 | 徐亮红 | Water pipe waste heat utilization device |
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2020
- 2020-06-20 CN CN202010569230.5A patent/CN111578730A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112944968A (en) * | 2021-01-08 | 2021-06-11 | 徐亮红 | Water pipe waste heat utilization device |
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