CN219264351U - Condensed water air heater - Google Patents
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- CN219264351U CN219264351U CN202320472377.1U CN202320472377U CN219264351U CN 219264351 U CN219264351 U CN 219264351U CN 202320472377 U CN202320472377 U CN 202320472377U CN 219264351 U CN219264351 U CN 219264351U
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Abstract
The utility model discloses a condensed water air heater, and belongs to the technical field of energy conservation and emission reduction of boilers. The device comprises a shaft seal heater, a condensate water circulating unit and a low-pressure heater arranged at the downstream of the shaft seal heater; the outlet of the shaft seal heater is connected with the inlet of the low-pressure heater at the downstream of the shaft seal heater; the water inlet end of the condensation water circulation unit is connected with the outlet of the low-pressure heater at the downstream of the shaft seal heater, and the water outlet end of the condensation water circulation unit is connected with the inlet of the shaft seal heater or the inlet of the low-pressure heater at the downstream of the shaft seal heater. The utility model can utilize low-quality extraction steam at the downstream of the shaft seal heater, uses condensed water as a heat source to heat the heater, replaces higher-quality steam, and achieves the purposes of energy conservation and emission reduction. Through setting up condensate water circulation unit, low-grade heat that can be fine utilizes also can rise cold wind temperature by a wide margin simultaneously, and cooperation air heater bypass flue gas waste heat utilization system or other waste heat utilization system use.
Description
Technical Field
The utility model relates to the technical field of energy conservation and emission reduction of boilers, in particular to a condensed water air heater system.
Background
The air preheater can improve the heat exchange performance of the boiler and reduce the energy consumption, but because sulfur trioxide exists in flue gas generated by fuel, the metal on the hot surface of the air preheater is easy to generate low-temperature corrosion, the metal on the hot surface of the air preheater is broken, a large amount of air leaks into the flue gas, so that the air supply combustion is deteriorated, the boiler efficiency is reduced, the heat transfer efficiency of the rotary air preheater is affected, meanwhile, the ash deposition is also increased due to corrosion, the resistance of a flue gas duct is increased, and the safety and the economic operation of the boiler are affected.
In order to prevent the low-temperature corrosion of the air preheater, the inlet air temperature of the air preheater needs to be ensured, so that the arrangement of the air heater on the cold air pipeline is a common scheme. The conventional scheme heater is a steam heater, and the steam source is generally 0.3-0.5 Mpa steam, and the steam is generally from the steam extraction corresponding to the third-stage or fourth-stage low-pressure heater downstream of the shaft seal heater. The extraction quality of the part of the heater is relatively high.
However, low-quality steam extraction generated by the low-pressure heater at the first stage or the second stage downstream of the shaft seal heater cannot be used, because the low-quality steam extraction is generally negative pressure or micro negative pressure and cannot be directly used by the cold air heater, thereby causing huge waste.
Disclosure of Invention
In order to solve the problem that the steam extraction generated by a low-pressure heater at the downstream of a shaft seal heater cannot be directly used by a cold air heater in the prior art, the utility model provides a condensed water heater, which adopts condensed water in an outlet of the low-pressure heater at the downstream of the shaft seal heater as a heat source to heat the heater, so that the temperature of cold air is greatly raised, and the cold air heater is matched with an air preheater bypass flue gas waste heat utilization system or other waste heat utilization systems for use.
In order to achieve the above object, the present utility model provides the following technical solutions:
the condensed water air heater is characterized by comprising a shaft seal heater, a condensed water circulating unit and a low-pressure heater arranged at the downstream of the shaft seal heater;
the outlet of the shaft seal heater is connected with the inlet of the low-pressure heater at the downstream of the shaft seal heater; the water inlet end of the condensation water circulation unit is connected with the outlet of the low-pressure heater at the downstream of the shaft seal heater, and the water outlet end of the condensation water circulation unit is connected with the inlet of the shaft seal heater or the inlet of the low-pressure heater at the downstream of the shaft seal heater;
the low-pressure heater at the downstream of the shaft seal heater comprises a plurality of low-pressure heaters which are connected in sequence, and the water inlet end of the condensation water circulation unit is connected with the outlet of any low-pressure heater.
Optionally, the condensed water circulating unit comprises a condensed water heater and a steam heater;
the steam heater is arranged on a bypass or a main path of the condensation water heater at one side of the water inlet end of the condensation water circulation unit.
Optionally, the condensate circulating unit further comprises a condensate circulating pump;
the condensate circulating pump is arranged at the water inlet end or the water outlet end of the condensate circulating unit.
Optionally, the steam heater is arranged on a bypass of the condensation water heater at one side of the water inlet end of the condensation water circulation unit, and a first valve is arranged on a main road of the condensation water heater at one side of the water inlet end of the condensation water circulation unit; one end of the steam heater is provided with a second valve, and the other end of the steam heater is provided with a third valve;
the other end of the second valve is connected to a main road of one side of the first valve, which is close to the condensed water heater;
the other end of the third valve is connected to a main road of one side of the first valve, which is far away from the condensed water heater.
Optionally, the steam heater is arranged on a main road of the condensation water heater on one side of the water inlet end of the condensation water circulation unit, a second valve is arranged on one side of the steam heater close to the condensation water heater, and a third valve is arranged on one side of the steam heater far away from the condensation water heater.
Optionally, the low-pressure heater at the downstream of the shaft seal heater comprises a first-stage low-pressure heater at the downstream of the shaft seal heater, a second-stage low-pressure heater at the downstream of the shaft seal heater, a third-stage low-pressure heater at the downstream of the shaft seal heater and a fourth-stage low-pressure heater at the downstream of the shaft seal heater;
the inlet of the first-stage low-pressure heater at the downstream of the shaft seal heater is connected with the outlet of the shaft seal heater through a pipeline, and the outlet of the first-stage low-pressure heater at the downstream of the shaft seal heater is connected with the inlet of the second-stage low-pressure heater at the downstream of the shaft seal heater through a pipeline;
the outlet of the second-stage low-pressure heater at the downstream of the shaft seal heater is connected with the inlet of the third-stage low-pressure heater at the downstream of the shaft seal heater through a pipeline;
and an outlet of the third-stage low-pressure heater at the downstream of the shaft seal heater is connected with an inlet of the fourth-stage low-pressure heater at the downstream of the shaft seal heater through a pipeline.
Optionally, the water inlet end of the condensation water circulation unit is connected with the outlet of the first-stage low-pressure heater at the downstream of the shaft seal heater, and the water outlet end of the condensation water circulation unit is connected with the outlet of the shaft seal heater.
Optionally, the water inlet end of the condensation water circulation unit is connected with the outlet of the first-stage low-pressure heater at the downstream of the shaft seal heater, and the water outlet end of the condensation water circulation unit is connected with the inlet of the shaft seal heater.
Optionally, the water inlet end of the condensation water circulation unit is connected with the outlet of the second-stage low-pressure heater at the downstream of the shaft seal heater, and the water outlet end of the condensation water circulation unit is connected with the inlet of the first-stage low-pressure heater at the downstream of the shaft seal heater.
Optionally, the water inlet end of the condensate circulating system is connected with the outlet of the second-stage low-pressure heater at the downstream of the shaft seal heater, and the water outlet end of the condensate circulating unit is connected with the inlet of the shaft seal heater;
the water inlet end of the condensation water circulation unit is connected with the outlet of the three-stage low-pressure heater at the downstream of the shaft seal heater, and the water outlet end of the condensation water circulation unit is connected with the inlet of the first-stage low-pressure heater at the downstream of the shaft seal heater.
Compared with the prior art, the utility model has the following beneficial effects:
compared with the prior art, the utility model is connected to the outlet of the low-pressure heater at the downstream of the shaft seal heater through the condensed water circulating unit, and the condensed water in the outlet of the low-pressure heater at the downstream of the shaft seal heater is used as a heat source to heat the air heater, wherein the heat of the low-pressure heater at the first stage and the second stage at the downstream of the shaft seal heater is actually extracted from the steam turbine corresponding to the low-pressure heater at the stage, the quality of the extracted steam is necessarily lower than that of the extracted steam corresponding to the conventional steam air heater, and the extracted steam is difficult to use. The utility model utilizes the extracted steam of the part to realize energy saving of the system. The general pressure of the low-pressure heater steam extraction at the downstream of the shaft seal heater is negative pressure or micro negative pressure, and the low-pressure heater steam extraction cannot be directly used by a cold air heater steam source, so that the problem that the steam extraction cannot be used is solved by adopting condensation water as a heat source. The condensing water is used as a heat source to heat the heater to replace higher-quality steam, so that energy conservation and emission reduction are achieved. Through setting up condensate water circulation unit, low-grade heat that can be fine utilizes also can rise cold wind temperature by a wide margin simultaneously, and cooperation air heater bypass flue gas waste heat utilization system or other waste heat utilization system use.
Further, a valve is arranged between the condensed water air heater and the condensed water circulating pump, the heating capacity can be adjusted according to the system requirement, the low-temperature corrosion requirement of the air preheater can be met, the cold air temperature can be greatly raised, and the cold air heater is matched with an air preheater bypass flue gas waste heat utilization system or other waste heat utilization systems.
Further, the condensate circulating unit is provided with a condensate circulating pump, the condensate circulating pump can be arranged at the water inlet end of the condensate circulating unit and also can be arranged at the water outlet end of the condensate circulating unit, the condensate circulating unit is boosted, the condensate heater is ensured to have enough condensate flowing through under any working condition, and cavitation phenomenon of equipment is avoided.
Further, the steam heater can be arranged on a main path or a bypass path between the condensation water heater and the condensation water circulating pump, and meanwhile, the two ends of the steam heater are provided with valves, so that whether the steam heater is used or not can be selected according to working conditions.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, proportional sizes, and the like of the respective components in the drawings are merely illustrative for aiding in understanding the present utility model, and are not particularly limited. In the drawings:
FIG. 1 is a schematic diagram of a condensate water heater system according to embodiment 1 of the present utility model;
FIG. 2 is a schematic diagram of a condensate water heater system according to embodiment 2 of the present utility model;
FIG. 3 is a schematic diagram of a condensate water heater system according to embodiment 3 of the present utility model;
FIG. 4 is a schematic diagram of a condensate water heater system according to embodiment 4 of the present utility model;
fig. 5 is a schematic diagram of a condensate water heater system according to embodiment 5 of the present utility model.
In the figure, 1 is a shaft seal heater, 11 is a first-stage low-pressure heater downstream of the shaft seal heater, 12 is a second-stage low-pressure heater downstream of the shaft seal heater, 13 is a third-stage low-pressure heater downstream of the shaft seal heater, 14 is a four third-stage low-pressure heater downstream of the shaft seal heater, 2 is a condensate water heater, 3 is a steam heater, 4 is a condensate water circulating pump, 51 is a first valve, 52 is a second valve, and 53 is a third valve.
Detailed Description
In order to make the technical solution of the present utility model better understood by those skilled in the art, the technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, shall fall within the scope of the utility model.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only 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 utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The utility model relates to a condensed water air heater system which consists of a shaft seal heater 1, a condensed water circulating unit, a low-pressure heater at the downstream of the shaft seal heater and a pipeline.
The condensed water circulating unit comprises a condensed water heater 2, a steam heater 3, a condensed water circulating pump 4 and a valve.
The condensate circulating pump 4 is arranged in the condensate circulating unit, the condensate circulating pump 4 ensures that condensate flows through the condensate circulating unit at a certain flow rate under any working condition, a condensate heater is ensured to have enough condensate flowing through, cavitation phenomenon of equipment is avoided, and meanwhile, the condensate circulating pump 4 is utilized to boost the pressure of the whole condensate circulating unit.
The condensate circulating pump 4 may be disposed at the water inlet end of the condensate circulating unit, or may be disposed at the water outlet end of the condensate circulating unit.
The condensed water heater 2 is arranged on the main road at one side of the water inlet end of the condensed water circulating unit and is provided with a first valve 51. The first valve 51 can adjust heating capacity according to system requirements, can only meet low-temperature corrosion requirements of the air preheater, avoid metal cracking of a hot surface of the air preheater, and can also greatly raise cold air temperature for use in cooperation with an air preheater bypass flue gas waste heat utilization system or other waste heat utilization systems.
The steam heater 3 is arranged on a bypass of the condensate water heater 2 at one side of the water inlet end of the condensate water circulation unit, one end of the bypass of the steam heater 3 is provided with a second valve 52, and the other end is provided with a third valve 53.
The other end of the second valve 52 is connected to the main path between the condensate water heater 2 and the first valve 51, and the other end of the third valve 53 is connected to the main path on the side of the first valve 51 away from the condensate water heater 2.
It is possible to decide whether to use the steam heater 3 according to the working conditions, and if not, the condensed water does not pass through the steam heater 3 by closing the first valve 51 and the second valve 52 at both ends of the steam heater 3.
The steam heater 3 can also be arranged on the main road of the condensate water heater 2 at the water inlet end side of the condensate water circulation unit. A second valve 52 is arranged between the steam heater 3 and the condensed water heater 2, and a third valve 53 is arranged on one side of the steam heater 3 away from the condensed water heater 2.
Whether the steam heater 3 is arranged on the main road or the bypass road is selected according to the requirement of working conditions.
The low-pressure heater downstream of the shaft seal heater comprises a first-stage low-pressure heater 11 downstream of the shaft seal heater, a second-stage low-pressure heater 12 downstream of the shaft seal heater, a third-stage low-pressure heater 13 downstream of the shaft seal heater and a fourth-stage low-pressure heater 14 downstream of the shaft seal heater.
The outlet of the shaft seal heater 1 is connected with the inlet of a first-stage low-pressure heater 11 at the downstream of the shaft seal heater through a pipeline; the outlet of the first-stage low-pressure heater 11 at the downstream of the shaft seal heater is connected with the inlet of the second-stage low-pressure heater 12 at the downstream of the shaft seal heater through a pipeline; the outlet of the second-stage low-pressure heater 12 at the downstream of the shaft seal heater is connected with the inlet of the third-stage low-pressure heater 13 at the downstream of the shaft seal heater through a pipeline; the outlet of the third-stage low-pressure heater 13 downstream of the shaft seal heater is connected with the inlet of the fourth-stage low-pressure heater 14 downstream of the shaft seal heater through a pipeline.
The shaft seal heater 1 and low-pressure heaters at all stages downstream of the shaft seal heater are connected end to end through pipelines.
The water inlet end of the condensation water circulation unit is connected with the outlet of the low-pressure heater at the downstream of the shaft seal heater through a pipeline, and the water outlet end of the condensation water circulation unit is connected with the inlet of the low-pressure heater at the downstream of the shaft seal heater through a pipeline. And selecting a certain stage of the condensation water circulation unit, which is connected with the low-pressure heater at the downstream of the shaft seal heater, according to working conditions.
And according to the requirements, the condensation water at the outlets of the first-stage low-pressure heater and the second-stage low-pressure heater at the downstream of the shaft seal heater is used as a heat source to heat the air heater, and the condensation water is cooled and then returns to the outlet or the inlet of the shaft seal heater 1. The heating capacity of the condensation water heater 2 can be adjusted according to the system requirement, only the low-temperature corrosion requirement of the air preheater can be met, and the cold air temperature can be greatly raised to be matched with the bypass flue gas waste heat utilization system of the air preheater or other waste heat utilization systems. When the cold air temperature is greatly raised, the condensed water is obtained from the outlet of the shaft seal heater downstream third-stage low-pressure heater 13, and the high-quality flue gas with equal heat is replaced, so that the energy utilization level is improved.
The present utility model will be described in detail below with reference to the drawings and examples.
Example 1
Referring to fig. 1, the condensate water at the outlet of the first-stage low-pressure heater 11 downstream of the seal heater is used as a heat source to heat the condensate water heater 2 as required, and the condensate water is cooled and returned to the outlet of the seal heater 1. The heating capacity of the condensed water heater 2 can be adjusted by a valve according to the system requirement.
Example 2
Referring to fig. 2, the difference from embodiment 1 is that the condensate water at the outlet of the low pressure heater 11 at the downstream of the shaft seal heater is used as a heat source to heat the condensate water heater 2 according to the need, and the condensate water is cooled and returned to the inlet of the shaft seal heater 1.
Example 3
Referring to fig. 3, the difference from embodiment 1 is that the condensate water at the outlet of the second stage low pressure heater 12 downstream of the seal heater is used as a heat source to heat the condensate water heater 2 according to the need, and the condensate water is cooled and returned to the inlet of the first stage low pressure heater 11 downstream of the seal heater.
Example 4
Referring to fig. 4, the difference from embodiment 1 is that the condensate water at the outlet of the second low pressure heater 12 downstream of the seal heater is used as a heat source to heat the condensate water heater 2 according to the need, and the condensate water is cooled and returned to the inlet of the seal heater 1.
Example 5
Referring to fig. 5, the difference from embodiment 1 is that the condensate water at the outlet of the third stage low pressure heater 13 downstream of the seal heater is used as a heat source to heat the condensate water heater 2 according to the need, and the condensate water is cooled and returned to the inlet of the first stage low pressure heater 11 downstream of the seal heater. When the cold air temperature needs to be greatly raised, condensate water is obtained from the outlet of the third-stage low-pressure heater 13 at the downstream of the shaft seal heater, and high-quality flue gas with equal heat can be replaced, so that the energy utilization level is improved.
For the above 5 embodiments, the steam heater 3 may be disposed not only on the bypass of the condensate water heater 2 on the side of the water inlet end of the condensate water circulation unit, but also on the main road of the condensate water heater 2 on the side of the water inlet end of the condensate water circulation unit. The condensate circulating pump 4 may be disposed at the water inlet end of the condensate circulating unit, or may be disposed at the water outlet end of the condensate circulating unit.
Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but instead should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated herein by reference for the purpose of completeness. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to forego such subject matter, nor should the applicant be deemed to have such subject matter not considered to be part of the disclosed subject matter.
The foregoing is a further elaboration of the present utility model, and it is not intended that the utility model be limited to the specific embodiments shown, but rather that a number of simple deductions or substitutions be made by one of ordinary skill in the art without departing from the spirit of the utility model, all shall be deemed to fall within the scope of the utility model as defined by the claims which are filed herewith.
Claims (10)
1. The condensate water heater is characterized by comprising a shaft seal heater (1), a condensate water circulation unit and a low-pressure heater arranged at the downstream of the shaft seal heater;
the outlet of the shaft seal heater (1) is connected with the inlet of the low-pressure heater at the downstream of the shaft seal heater; the water inlet end of the condensation water circulation unit is connected with the outlet of the low-pressure heater at the downstream of the shaft seal heater, and the water outlet end of the condensation water circulation unit is connected with the inlet of the shaft seal heater or the inlet of the low-pressure heater at the downstream of the shaft seal heater;
the low-pressure heater at the downstream of the shaft seal heater comprises a plurality of low-pressure heaters which are connected in sequence, and the water inlet end of the condensation water circulation unit is connected with the outlet of any low-pressure heater.
2. The condensed water heater according to claim 1, wherein the condensed water circulation unit comprises a condensed water heater (2) and a steam heater (3);
the steam heater (3) is arranged on a bypass or a main way of the condensation water heater (2) at one side of the water inlet end of the condensation water circulation unit.
3. A condensate water heater as claimed in claim 1 or 2, wherein the condensate water circulation unit further comprises a condensate water circulation pump (4);
the condensate circulating pump (4) is arranged at the water inlet end or the water outlet end of the condensate circulating unit.
4. The condensed water heater according to claim 2, wherein the steam heater (3) is arranged on a bypass of the condensed water heater (2) at one side of the water inlet end of the condensed water circulating unit, and a first valve (51) is arranged on a main road of the condensed water heater (2) at one side of the water inlet end of the condensed water circulating unit; one end of the steam heater (3) is provided with a second valve (52), and the other end of the steam heater (3) is provided with a third valve (53);
the other end of the second valve (52) is connected to a main path of the first valve (51) close to one side of the condensed water heater (2);
the other end of the third valve (53) is connected to a main circuit of one side of the first valve (51) far away from the condensed water heater (2).
5. The condensate water heater according to claim 2, wherein the steam heater (3) is arranged on a main road of the condensate water heater (2) on the side of the condensate water circulating unit water inlet end, the steam heater (3) is provided with a second valve (52) on the side close to the condensate water heater (2), and the steam heater (3) is provided with a third valve (53) on the side far away from the condensate water heater (2).
6. A condensate water heater as claimed in claim 1 or 2, wherein the low pressure heater downstream of the shaft seal heater comprises a first stage low pressure heater (11) downstream of the shaft seal heater, a second stage low pressure heater (12) downstream of the shaft seal heater, a third stage low pressure heater (13) downstream of the shaft seal heater and a fourth stage low pressure heater (14) downstream of the shaft seal heater;
the inlet of the shaft seal heater downstream first-stage low-pressure heater (11) is connected with the outlet of the shaft seal heater (1) through a pipeline, and the outlet of the shaft seal heater downstream first-stage low-pressure heater (11) is connected with the inlet of the shaft seal heater downstream second-stage low-pressure heater (12) through a pipeline;
the outlet of the second-stage low-pressure heater (12) at the downstream of the shaft seal heater is connected with the inlet of the third-stage low-pressure heater (13) at the downstream of the shaft seal heater through a pipeline;
and an outlet of the third-stage low-pressure heater (13) at the downstream of the shaft seal heater is connected with an inlet of the fourth-stage low-pressure heater (14) at the downstream of the shaft seal heater through a pipeline.
7. The condensed water heater according to claim 6, wherein the water inlet end of the condensed water circulating unit is connected with the outlet of the shaft seal heater (1), and the water outlet end of the condensed water circulating unit is connected with the outlet of the shaft seal heater (11).
8. The condensed water heater according to claim 6, wherein the water inlet end of the condensed water circulating unit is connected with the outlet of the first-stage low-pressure heater (11) at the downstream of the shaft seal heater, and the water outlet end of the condensed water circulating unit is connected with the inlet of the shaft seal heater (1).
9. The condensed water heater according to claim 6, wherein the water inlet end of the condensed water circulating unit is connected with the outlet of the second-stage low-pressure heater (12) downstream of the shaft seal heater, and the water outlet end of the condensed water circulating unit is connected with the inlet of the first-stage low-pressure heater (11) downstream of the shaft seal heater.
10. The condensed water heater according to claim 6, wherein the water inlet end of the condensed water circulating system is connected with the outlet of the second-stage low-pressure heater (12) at the downstream of the shaft seal heater, and the water outlet end of the condensed water circulating unit is connected with the inlet of the shaft seal heater (1);
the water inlet end of the condensation water circulation unit is connected with the outlet of the shaft seal heater downstream three-stage low-pressure heater (13), and the water outlet end of the condensation water circulation unit is connected with the inlet of the shaft seal heater downstream first-stage low-pressure heater (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320472377.1U CN219264351U (en) | 2023-03-13 | 2023-03-13 | Condensed water air heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320472377.1U CN219264351U (en) | 2023-03-13 | 2023-03-13 | Condensed water air heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219264351U true CN219264351U (en) | 2023-06-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320472377.1U Active CN219264351U (en) | 2023-03-13 | 2023-03-13 | Condensed water air heater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219264351U (en) |
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2023
- 2023-03-13 CN CN202320472377.1U patent/CN219264351U/en active Active
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