CN107191778B - Drainage pipeline device - Google Patents
Drainage pipeline device Download PDFInfo
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- CN107191778B CN107191778B CN201710581781.1A CN201710581781A CN107191778B CN 107191778 B CN107191778 B CN 107191778B CN 201710581781 A CN201710581781 A CN 201710581781A CN 107191778 B CN107191778 B CN 107191778B
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- valve
- pipeline
- electric main
- main valve
- drain
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16T—STEAM TRAPS OR LIKE APPARATUS FOR DRAINING-OFF LIQUIDS FROM ENCLOSURES PREDOMINANTLY CONTAINING GASES OR VAPOURS
- F16T1/00—Steam traps or like apparatus for draining-off liquids from enclosures predominantly containing gases or vapours, e.g. gas lines, steam lines, containers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16T—STEAM TRAPS OR LIKE APPARATUS FOR DRAINING-OFF LIQUIDS FROM ENCLOSURES PREDOMINANTLY CONTAINING GASES OR VAPOURS
- F16T1/00—Steam traps or like apparatus for draining-off liquids from enclosures predominantly containing gases or vapours, e.g. gas lines, steam lines, containers
- F16T1/38—Component parts; Accessories
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pipeline Systems (AREA)
Abstract
The invention discloses a drainage pipeline device, which comprises an electric main valve front drainage pipeline and an electric main valve rear drainage pipeline which are arranged in parallel, wherein a valve 1 is arranged on the electric main valve front drainage pipeline, a valve 2 is arranged on the electric main valve rear drainage pipeline, and the drainage pipeline device further comprises an electric main valve main drainage pipeline, and a valve 3 is arranged on the electric main valve main drainage pipeline; the valve 3 is connected with the valve 2 in a linkage way, or the valve 3 is connected with the valve 1 in a linkage way, and when the valve 3 is closed, the valve 2 or the valve 1 is also closed. If the valve 2 or the valve 1 is closed, the bypass of the main steam pipeline in the drain pipeline device is cut off, and the high-temperature and high-pressure main steam is not circulated in the bypass, so that the temperature of the condensation water in the electric main valve main drain pipeline is reduced. The temperature of the valve body of the valve 3 will approach the ambient temperature. Thus, erroneous judgment is avoided, and unnecessary replacement and maintenance work is reduced. The invention also provides another form of hydrophobic plumbing device.
Description
Technical Field
The invention relates to the field of thermal power plants, in particular to a hydrophobic pipeline device.
Background
In a thermal power plant, in an initial stage of starting up, condensed water is doped in main steam in a main steam pipeline, so that in order to prevent the condensed water from being brought into a turbine running at a high speed to cause a water hammer accident of the turbine, the main steam in the initial stage is generally led into a drainage pipeline device for drainage treatment. Please refer to fig. 1 for the structure of the hydrophobic pipeline device: the valve 4 is an electric main valve, the valve 1 is an electric main valve front drainage primary valve, the valve 2 is an electric main valve rear drainage primary valve, and the valve 3 is an electric main valve front and rear drainage total valve. When in dewatering, the valve 1, the valve 2 and the valve 3 are all in an open state, and a condenser is arranged at the rear part of the valve 3. The main steam doped with condensed water enters a condenser at the rear part of the valve 3 along two routes of the A-B-C-valve 1-D-valve 3 and the E-valve 2-D-valve 3, after the water drainage is finished, the valve 3 is closed, and the valve 1 and the valve 2 are normally open valves.
Workers usually judge whether the valve leaks inwards or not through the temperature of the valve body. It is generally believed that the valve leaks inwardly when the temperature of the valve is above ambient. However, in some hydrophobic piping devices, such as the valve 3 in fig. 1, the valve body temperature of the valve 3 is always higher than the ambient temperature even if the valve 3 is not leaked inside, and the reason thereof cannot be explained by the related art, even if it is not known that there is such a problem. When the internal leakage is detected, the valve 3 whose valve body temperature is higher than the ambient temperature is usually misjudged as internal leakage, and the valve 3 is replaced or maintained.
Therefore, how to avoid misjudgment on the internal leakage of the valve and reduce unnecessary replacement and maintenance work is a critical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention aims to provide a drainage pipeline device which can avoid misjudgment on internal leakage of a valve, so that unnecessary replacement and maintenance work is reduced.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the drain pipeline device comprises an electric main valve front drain pipeline and an electric main valve rear drain pipeline which are arranged on a main steam pipeline in parallel, wherein a valve 1 is arranged on the electric main valve front drain pipeline, a valve 2 is arranged on the electric main valve rear drain pipeline, the drain pipeline device further comprises an electric main valve total drain pipeline which is communicated with the output end of the electric main valve front drain pipeline and the output end of the electric main valve rear drain pipeline, a valve 3 is arranged on the electric main valve total drain pipeline, and the output end of the electric main valve total drain pipeline is communicated with a condenser;
the valve 3 is connected with the valve 2 in a linkage way, or the valve 3 is connected with the valve 1 in a linkage way, and when the valve 3 is closed, the valve 2 or the valve 1 is also closed.
Preferably, the electric main valve front drain pipeline comprises a vertical AB section pipeline and a horizontal BC section pipeline, and the AB section pipeline is communicated with the BC section pipeline through a U-shaped bend;
the U-shaped bend is vertical, the left port of the U-shaped bend is communicated with the output port of the AB section pipeline, the right port of the U-shaped bend is communicated with the input port of the BC section pipeline, and a phase change surface is formed in the left pipe of the U-shaped bend.
Preferably, the left port of the U-bend is welded to the output port of the AB section pipe, and the right port of the U-bend is welded to the input port of the BC section pipe.
The invention also provides a drainage pipeline device, which comprises an electric main valve front drainage pipeline and an electric main valve rear drainage pipeline which are arranged on a main steam pipeline in parallel, wherein a valve 1 is arranged on the electric main valve front drainage pipeline, a valve 2 is arranged on the electric main valve rear drainage pipeline, and the drainage pipeline device further comprises an electric main valve main drainage pipeline which is communicated with the output end of the electric main valve front drainage pipeline and the output end of the electric main valve rear drainage pipeline, a valve 3 is arranged on the electric main valve main drainage pipeline, and the output end of the electric main valve main drainage pipeline is communicated with a condenser;
the electric main valve main drainage pipeline is additionally provided with a U-shaped bend, the U-shaped bend is arranged close to a D point of the electric main valve main drainage pipeline, and a phase change surface is formed in the U-shaped bend.
Preferably, the U-bend is upright, and the phase change surface is formed in a left tube of the U-bend.
Preferably, the U-shaped bend is welded in the electric main valve total drain pipeline.
Preferably, the U-shaped bend is inverted, and the phase change surface is formed in a right side tube of the U-shaped bend.
Preferably, the U-shaped bend is welded in the electric main valve total drain pipeline.
As can be seen from the above technical solution, the present invention sets the valve 3 and the valve 2 in the hydrophobic pipeline to be linked, or sets the valve 3 and the valve 1 to be linked. Thus, after the end of the drainage, when the valve 3 is closed, the valve 2 or the valve 1 is also closed. If the valve 2 or the valve 1 is closed, the bypass of the main steam pipeline in the drain pipeline device is cut off, high-temperature and high-pressure main steam is not circulated in the bypass, condensed water in the electric main valve main drain pipeline is not carried away by the main steam in the bypass, the main steam in the bypass is not fed into the electric main valve main drain pipeline, the temperature of the condensed water in the electric main valve main drain pipeline is reduced, and the valve 3 in the electric main valve main drain pipeline is close to the ambient temperature under the condition of no internal leakage. Thus, erroneous judgment is avoided, and unnecessary replacement and maintenance work is reduced.
Drawings
In order to more clearly illustrate the solution of the embodiments of the present invention, the following description will briefly explain the drawings needed to be used in the embodiments, it being evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a hydrophobic pipeline according to an embodiment of the prior art;
FIG. 2 is a schematic diagram of a hydrophobic pipeline according to an embodiment of the present invention;
FIG. 3 is a schematic view of a hydrophobic pipeline according to an embodiment of the present invention;
FIG. 4 is an enlarged view of the U-bend of FIG. 3;
FIG. 5 is a schematic view of a hydrophobic pipeline according to an embodiment of the present invention;
FIG. 6 is an enlarged view of the U-bend of FIG. 5;
fig. 7 is a schematic diagram of an inverted U-bend on a DF segment pipeline according to an embodiment of the present invention.
Wherein 10 is a U-shaped bend, 100 is an electric main valve front drain pipeline, 200 is an electric main valve rear drain pipeline, and 300 is an electric main valve main drain pipeline.
Detailed Description
The invention discloses a drainage pipeline device which can avoid misjudgment on internal leakage of a valve, so that unnecessary replacement and maintenance work is reduced.
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
The valve 3 mentioned in the background art is not leaked inside, and the reason why the valve body temperature of the valve 3 is always higher than the ambient temperature is as follows: referring to fig. 1, after the end of the drainage, the valve 3 is closed. The bypass formed by the A-B-C-valve 1-D-valve 2-E is filled with main steam. The main steam in the DF section pipeline is condensed into water through heat exchange between the pipe wall and the heat insulation layer and the environment, and the DF section pipeline is horizontally arranged, so that the condensed water in the DF section pipeline inevitably flows to the point D, the point D is a ring formed by a bypass of the main steam pipeline, the main steam flowing through the point D can take away the condensed water flowing into the point D, after the condensed water is taken away, new main steam is fed into the DF section pipeline, the DF section pipeline continuously exchanges heat with the external environment again, more main steam is condensed into water, the condensed water continuously flows to the point D and is taken away by the main steam which passes through the bypass, and the process is endless in the DF section pipeline and circularly and reciprocally. Such a tube valve arrangement keeps the DF stage conduit at a constant high temperature, resulting in a high temperature of the valve body of the valve 3 and ultimately a false positive.
In an embodiment of the present invention, referring to fig. 2, the drain pipe device includes an electric main valve front drain pipe 100 and an electric main valve rear drain pipe 200 which are arranged in parallel on the main steam pipe, a valve 1 is arranged on the electric main valve front drain pipe 100, and the valve 1 is an electric main valve front drain valve. The valve 2 is arranged on the electric main valve rear drain pipeline 200, and the valve 2 is an electric main valve rear drain valve. The electric main valve main drain pipeline 300 is communicated with the output end of the electric main valve front drain pipeline 100 and the output end of the electric main valve rear drain pipeline 200, a valve 3 is arranged on the electric main valve main drain pipeline 300, the valve 3 is an electric main valve main drain valve, and the output end of the electric main valve main drain pipeline 300 is communicated with the condenser. In this embodiment, the valve 3 is connected with the valve 2 in a linkage manner, or the valve 3 is connected with the valve 1 in a linkage manner, and when the valve 3 is closed, the valve 2 or the valve 1 is closed.
In this embodiment, after the end of the drainage, the valve 2 or the valve 1 is closed when the valve 3 is closed. If the valve 2 or the valve 1 is closed, the bypass of the main steam pipeline in the drain pipeline device is cut off, high-temperature and high-pressure main steam is not circulated in the bypass, so that condensed water in the electric main valve main drain pipeline 300 is not carried away by the main steam in the bypass, the main steam in the bypass is not fed into the electric main valve main drain pipeline 300, the temperature of the condensed water in the electric main valve main drain pipeline 300 is reduced, and the valve body temperature of the valve 3 in the electric main valve main drain pipeline 300 is close to the ambient temperature under the condition of no internal leakage. Thus, erroneous judgment is avoided, and unnecessary replacement and maintenance work is reduced.
In addition, after the bypass of the main steam is cut off, the condensed water in the DF section pipeline can not be brought to the turbine running at high speed by the main steam, so that the turbine has water hammer accidents, and the production safety is improved. In addition, as the bypass is cut off, the high-temperature and high-pressure main steam is not circulated in the bypass, and the main steam can not exchange heat with the external environment through the bypass, so that the heat loss of the main steam is avoided, and the purposes of energy conservation and consumption reduction are achieved.
After the bypass is cut off, the main steam pipeline temperature is constant, and the ambient temperature is also approximately constant, so that a definite phase change surface exists in a certain section of the hydrophobic pipeline, wherein the phase change surface is high-temperature and high-pressure steam, and the phase change surface is condensation water. The temperature at the phase transition surface is the temperature of the saturated vapor pressure. For the same pipe system, the same main steam temperature and a comparable ambient temperature, the phase change surface is in the vicinity of the same location (height) each time. It will be appreciated by those skilled in the art that the temperature of the phase change surface is saturated vapor temperature, the portion above the phase change surface is high temperature, high pressure vapor, and the temperature is very high, while the portion below the phase change surface is condensate, and the temperature is rapidly reduced until the temperature approaches ambient temperature. Therefore, the part filled with high-temperature and high-pressure water vapor in the hydrophobic pipeline is reduced as much as possible, and the part filled with condensed water in the pipeline is increased to be the key for solving the energy-saving problem.
Referring to fig. 1, the motorized main valve pre-drain conduit 100 generally includes a vertical AB-segment conduit and a horizontal BC-segment conduit. Typically the length of the AB section tubing is shorter and the length of the BC section tubing is longer. In the case where the bypass is cut, the phase change surface is typically present in the BC section line or the CD section line, then the BC section line is at or above the phase change surface, and then the BC section line is present with a high temperature and high pressure water vapor portion. When the phase change surface is positioned in the BC segment pipeline, the length of the phase change surface is the horizontal length of the BC segment pipeline, at the moment, the upper half part in the BC segment pipeline is steam, and the lower half part is condensed water. Because the BC section pipe is long, a large amount of high-temperature and high-pressure water vapor exchanges heat with the external environment, and heat loss is caused. Therefore, in order to avoid a great deal of heat loss, the phase change surface needs to be present in the vertical AB section pipeline, and the most direct way is to extend the length of the AB section, but the modification is difficult, high in cost and long in time, and the workload of moving the BC section pipeline downwards is very huge, so that the U-shaped bend 10 is introduced in one embodiment of the invention. Referring to fig. 3, the U-shaped bend 10 is upright, the left port of the U-shaped bend 10 is communicated with the output port of the AB section pipe, and the right port of the U-shaped bend 10 is communicated with the input port of the BC section pipe. Thus, the length of the AB-section pipeline in the vertical direction is extended, the extended length is the length of the left pipe of the U-shaped bend 10, and a phase change surface can be formed in the left pipe of the U-shaped bend 10 as long as the length of the left pipe of the U-shaped bend 10 is proper. In the embodiment, the purpose of prolonging the vertical length of the AB-section pipeline can be achieved by adding the U-shaped bend 10, and the method is simple to operate and easy to realize.
To ensure the connection firmness of the U-bend 10, in one embodiment of the present invention, the left port of the U-bend 10 is welded to the output port of the AB section pipe, and the right port of the U-bend 10 is welded to the input port of the BC section pipe.
The bypass is cut off by closing the valve 1 or the valve 2, but for some drain pipe devices, the electric main valve front drain valve, namely the valve 1, and the electric main valve rear drain valve, namely the valve 2, cannot be closed, meaning that the bypass formed by the A-B-C-valve 1-D-valve 2-E always circulates main steam with high temperature and high pressure, so that in this case, how to lead the condensate in the DF section pipe not to be taken away by the main steam and simultaneously avoid the main steam from being fed into the DF section pipe, thereby leading the temperature of the condensate in the DF section pipe to be reduced, and becoming the problem to be solved urgently.
In one embodiment of the present invention, the drain pipe device includes an electric main valve front drain pipe 100 and an electric main valve rear drain pipe 200 which are arranged in parallel on the main steam pipe, wherein a valve 1 is arranged on the electric main valve front drain pipe 100, and the valve 1 is an electric main valve front drain valve. The valve 2 is arranged on the electric main valve rear drain pipeline 200, and the valve 2 is an electric main valve rear drain valve. The electric main valve main drain pipeline 300 is communicated with the output end of the electric main valve front drain pipeline 100 and the output end of the electric main valve rear drain pipeline 200, a valve 3 is arranged on the electric main valve main drain pipeline 300, the valve 3 is an electric main valve main drain valve, and the output end of the electric main valve main drain pipeline 300 is communicated with the condenser. In this embodiment, a U-bend 10 is also introduced, which U-bend 10 is connected to the electric main valve main drain pipe 300, i.e. the DF-section pipe, which U-bend 10 is arranged close to the point D. The setting of the U-shaped bend 10 is equivalent to lengthening the length of the DF section in the vertical direction, so long as the vertical length of the U-shaped bend 10 is proper, a phase change surface is formed in the U-shaped bend 10, after the phase change surface is formed, condensation water in a pipeline behind the phase change surface is isolated by the phase change surface, the condensation water can not be taken away by main steam in a bypass any more, and the temperature of the isolated condensation water can be rapidly reduced. The embodiment achieves the purpose of cooling the condensed water in the DF section without cutting off the bypass, and avoids the occurrence of misjudgment.
If the space below the DF section is sufficient, the U-bend 10 can be positioned upright, and a phase change surface will be formed in the left tube of the U-bend 10. If there is insufficient space below the DF section, the U-bend 10 may be configured as inverted, and a phase change surface may be formed in the right tube of the U-bend 10. Either the upright U-bend 10 or the inverted U-bend 10 is welded into the electric main valve main drain pipe 300.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The utility model provides a drain pipeline device, includes electric main valve preceding drain pipeline (100) and electric main valve back drain pipeline (200) of parallelly connected setting on main steam pipeline, be provided with valve 1 on electric main valve preceding drain pipeline (100), be provided with valve 2 on electric main valve back drain pipeline (200), still include with electric main valve always drain pipeline (300) of electric main valve preceding drain pipeline (100) and electric main valve back drain pipeline (200) output intercommunication, be provided with valve 3 on electric main valve always drain pipeline (300), electric main valve always drain pipeline (300) output and condenser intercommunication;
the valve 3 is connected with the valve 2 in a linkage way, or the valve 3 is connected with the valve 1 in a linkage way, and when the valve 3 is closed, the valve 2 or the valve 1 is also closed.
2. The drain conduit arrangement of claim 1, wherein the electrically powered main valve front drain conduit (100) comprises a vertical AB-section conduit and a horizontal BC-section conduit, the AB-section conduit being in communication with the BC-section conduit through a U-bend (10);
the U-shaped bend (10) is vertical, the left port of the U-shaped bend (10) is communicated with the output port of the AB section pipeline, the right port of the U-shaped bend (10) is communicated with the input port of the BC section pipeline, and a phase change surface is formed in the left side pipe of the U-shaped bend (10).
3. The hydrophobic tubing arrangement of claim 2, wherein a left port of the U-bend (10) is welded to an output port of the AB-section tubing and a right port of the U-bend (10) is welded to an input port of the BC-section tubing.
4. The utility model provides a drain pipeline device, includes electric main valve preceding drain pipeline (100) and electric main valve back drain pipeline (200) of parallelly connected setting on main steam pipeline, be provided with valve 1 on electric main valve preceding drain pipeline (100), be provided with valve 2 on electric main valve back drain pipeline (200), still include with electric main valve always drain pipeline (300) of electric main valve preceding drain pipeline (100) and electric main valve back drain pipeline (200) output intercommunication, be provided with valve 3 on electric main valve always drain pipeline (300), electric main valve always drain pipeline (300) output and condenser intercommunication;
the electric main valve main drainage pipeline (300) is additionally provided with a U-shaped bend (10), the U-shaped bend (10) is close to the junction of the output end of the electric main valve front drainage pipeline (100) and the output end of the electric main valve rear drainage pipeline (200), and a phase change surface is formed in the U-shaped bend (10).
5. The hydrophobic pipe arrangement according to claim 4, characterized in that the U-bend (10) is upright, the left side pipe of the U-bend (10) having the phase change surface formed therein.
6. The drain pipe arrangement according to claim 5, characterized in that the U-bend (10) is welded in the electric main valve main drain pipe (300).
7. The hydrophobic pipe arrangement according to claim 4, characterized in that the U-bend (10) is inverted, the right side pipe of the U-bend (10) having the phase change surface formed therein.
8. The drain pipe arrangement according to claim 7, characterized in that the U-bend (10) is welded in the electric main valve main drain pipe (300).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710581781.1A CN107191778B (en) | 2017-07-17 | 2017-07-17 | Drainage pipeline device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710581781.1A CN107191778B (en) | 2017-07-17 | 2017-07-17 | Drainage pipeline device |
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| Publication Number | Publication Date |
|---|---|
| CN107191778A CN107191778A (en) | 2017-09-22 |
| CN107191778B true CN107191778B (en) | 2023-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710581781.1A Active CN107191778B (en) | 2017-07-17 | 2017-07-17 | Drainage pipeline device |
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| CN (1) | CN107191778B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109611814B (en) * | 2018-12-29 | 2019-12-20 | 湖南鸿远高压阀门有限公司 | Measuring method and measuring system for heat energy loss of pipe valve arrangement drainage system |
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| CN204717660U (en) * | 2015-06-16 | 2015-10-21 | 国电龙源电力技术工程有限责任公司 | Thermal power plant's hydrophobic development unit steam discharge retracting device |
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| CN205173965U (en) * | 2015-11-16 | 2016-04-20 | 江苏四方锅炉有限公司 | Fire natural gas boiler flue gas hydrophobic structural |
| CN106195640A (en) * | 2016-08-26 | 2016-12-07 | 上海市政工程设计研究总院（集团）有限公司 | A kind of pressure air conduit condensate drain and method |
| CN207455155U (en) * | 2017-07-17 | 2018-06-05 | 湖南鸿远高压阀门有限公司 | drain pipe device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8176723B2 (en) * | 2008-12-31 | 2012-05-15 | General Electric Company | Apparatus for starting a steam turbine against rated pressure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06331104A (en) * | 1993-05-20 | 1994-11-29 | Hitachi Ltd | Steam drain discharging device |
| JPH09264499A (en) * | 1996-03-29 | 1997-10-07 | Osaka Gas Co Ltd | Draining method in gas pipe |
| CN201129620Y (en) * | 2007-11-23 | 2008-10-08 | 华泰集团有限公司 | Steam line drainage device |
| JP2012092734A (en) * | 2010-10-27 | 2012-05-17 | Chugoku Electric Power Co Inc:The | Blow fluid treatment equipment in ejector main steam system |
| CN103267425A (en) * | 2013-05-30 | 2013-08-28 | 深圳市广前电力有限公司 | Method and device for solving condenser low vacuum in combined cycle unit starting process |
| CN204717660U (en) * | 2015-06-16 | 2015-10-21 | 国电龙源电力技术工程有限责任公司 | Thermal power plant's hydrophobic development unit steam discharge retracting device |
| CN204730175U (en) * | 2015-07-03 | 2015-10-28 | 华电国际电力股份有限公司技术服务中心 | Steam soot blower of boiler near-end steam trap connection |
| CN205173965U (en) * | 2015-11-16 | 2016-04-20 | 江苏四方锅炉有限公司 | Fire natural gas boiler flue gas hydrophobic structural |
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| CN207455155U (en) * | 2017-07-17 | 2018-06-05 | 湖南鸿远高压阀门有限公司 | drain pipe device |
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| Publication number | Publication date |
|---|---|
| CN107191778A (en) | 2017-09-22 |
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