CN211716229U - Real-time monitoring device for steam pipeline drainage system - Google Patents
Real-time monitoring device for steam pipeline drainage system Download PDFInfo
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- CN211716229U CN211716229U CN201922343080.1U CN201922343080U CN211716229U CN 211716229 U CN211716229 U CN 211716229U CN 201922343080 U CN201922343080 U CN 201922343080U CN 211716229 U CN211716229 U CN 211716229U
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 16
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- 230000001960 triggered effect Effects 0.000 description 3
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- 238000010438 heat treatment Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
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- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses a real-time monitoring device for a steam pipeline drainage system, which comprises a first pipeline, a second pipeline and a third pipeline; the real-time monitoring device comprises N bimetal spring pieces, N temperature control switches, a first logic OR gate, a second logic OR gate and an alarm indicator lamp. Once drainage accumulation occurs during the operation of the steam pipeline, the pipe wall of the monitored area generates temperature difference to trigger the temperature control switch to act, an alarm signal is output, an electric valve on the bypass is forcibly opened to drain water emergently, the real-time monitoring of the drainage condition is realized, and accidents such as steam hammer/water hammer caused by unsmooth drainage are avoided. The utility model is suitable for an adopt high temperature steam to carry out energy transmission's places such as thermal power plant, nuclear power plant, thermal power plant, the device conveniently carries and installs, easy operation, and the range of application is wide. The low-temperature refrigerant can be applied to the field of low-temperature refrigeration after being properly improved.
Description
Technical Field
The utility model relates to a hydrophobic state real-time supervision and failure diagnosis field during high temperature power pipeline operation especially relates to a steam pipe drainage system real-time monitoring device.
Background
At present, in power plants such as nuclear power plants, thermal power plants or thermal power plants, fission energy in nuclear fuel or chemical energy in fossil fuel is generally used for heating feed water through heat conduction and other forms to obtain high-temperature and high-pressure water vapor, and the high-temperature and high-pressure water vapor is transmitted through a high-temperature steam pipeline to realize pushing a turbo generator unit to do work to generate power or supply heat remotely and the like.
In the places, a large number of high-temperature steam pipelines are distributed, the high-temperature steam inevitably has condensed hydrophobic water caused by temperature reduction and pressure reduction and condensation heat exchange in the flowing process, the part of hydrophobic water is required to be separated from the high-temperature steam in time after being accumulated to a certain degree, otherwise, the pipeline is damaged by water hammer impact caused by cold and hot intersection, the pipeline returns to the steam turbine to generate water hammer accidents to damage the steam turbine and other serious accidents under extreme conditions. For such high temperature pipelines which may generate condensed hydrophobic water, an automatic steam trap and a bypass pipeline containing an electric valve are often arranged to guide the generated hydrophobic water to a hydrophobic tank or a condenser for secondary utilization. When the automatic steam trap detects that the drain accumulation generates a liquid level high alarm signal, the automatic steam trap automatically acts to drain the drain and then is closed in time; and in an emergency, the electric valve can be opened to realize emergency drainage. After the liquid level high alarm signal disappears and is delayed for a certain time, the electric valve is triggered to close the signal, so that the problem that high-temperature and high-pressure steam in a steam pipeline flows away through a bypass and cannot normally do work to cause heat loss is avoided.
However, statistics shows that the high-temperature steam pipeline drainage system of a part of power plants has the phenomena that the automatic steam trap cannot perform normal actions, such as insufficient drainage capacity and jamming of the automatic steam trap, and also has the defects that the volume of a water tank of an upstream liquid level meter pipeline of the automatic steam trap is small, a drainage pipeline is blocked, pipeline gas accumulation and the like easily trigger a drainage liquid level high alarm by mistake, and at the moment, an electric valve on a high-temperature steam pipeline bypass is forced to be opened for drainage for a long time. Opening the electronic bypass valve for a long time can dredge high temperature high-energy steam to condenser or low reaches drain trap along with hydrophobic, can't exert its ability of acting, has serious heat energy waste. When the electric bypass valve is opened for a long time, the valve core is easily eroded by high-speed steam-water mixture to damage equipment. Before the defects are treated, the heat-insulating layer outside the high-temperature pipeline needs to be removed, and whether the hydrophobic accumulation phenomenon exists or not is observed for a long time by a temperature-dropping gun or a thermal imaging instrument, so that the risk of high-temperature scald exists. In the process of troubleshooting and processing, the manual stop valve is usually only stopped to process due to the fact that the isolation valve cannot be closed tightly (the manual stop valve has the defects of poor isolation and the like due to temperature difference under the high-temperature condition). These all have a negative impact on the economy and safety of the unit.
The high-temperature pipelines of a part of power plants are not provided with automatic steam traps, and after accidents such as water hammer and the like caused by cold and hot fluid intersection due to defects such as internal leakage of a valve occur, the steam and water pipelines are numerous and the pipelines are wrapped with heat-insulating layers, so that serious challenges are provided for searching the cold and hot fluid intersection position, the accidents can be only isolated by sections with verification and are checked step by step, the workload is huge, the industrial safety risk is high, and the failure cause analysis efficiency is low.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that to the defect that involves in the background art, provide a steam pipeline drainage system real time monitoring device.
The utility model discloses a solve above-mentioned technical problem and adopt following technical scheme:
a real-time monitoring device for a steam pipeline drainage system comprises a first pipeline, a second pipeline and a third pipeline; one end of each of the first pipeline, the second pipeline and the third pipeline is connected to a steam main pipe needing drainage, and the other end of each of the first pipeline, the second pipeline and the third pipeline is connected to a drainage tank, wherein the third pipeline is sequentially provided with a first manual ball valve, an electric bypass valve and a second manual ball valve along the drainage flow direction; the first pipeline is sequentially provided with a first manual stop valve, a liquid level meter and a second manual stop valve along the drainage flow direction; the second pipeline is sequentially provided with a third manual stop valve, an automatic steam trap and a fourth manual stop valve along the steam trap flow direction;
the real-time monitoring device comprises N bimetal spring pieces, N temperature control switches, a first logic OR gate, a second logic OR gate and an alarm indicator light;
the bimetal spring piece comprises two access contacts and two output ends, the two input ends of the bimetal spring piece are correspondingly connected with the two access contacts one by one, and the bimetal spring piece is used for converting temperature values of the two access contacts into electric signals and then outputting the electric signals from the corresponding output ends;
the N bimetal spring pieces are distributed on the pipe walls of the first pipeline, the second pipeline and the third pipeline, which need to be subjected to accumulated water monitoring, one access contact of each bimetal spring piece is arranged above the pipe wall, and the other access contact of each bimetal spring piece is arranged below the pipe wall;
the first logic OR gate comprises N input ends and one output end, the second logic OR gate comprises two input ends and one output end, and the first logic OR gate and the second logic OR gate are used for carrying out logic OR operation;
the temperature control switch comprises two input ends and an output end, the temperature control switch is used for comparing the difference value of the electric signals accessed by the two input ends, and when the difference value is larger than a preset voltage threshold value, the temperature control switch generates closing action to enable the output end to output high level;
the N temperature control switches correspond to the N bimetal spring pieces one by one, and two input ends of the temperature control switches are respectively connected with two output ends of the bimetal spring pieces corresponding to the temperature control switches one by one; the output ends of the N temperature control switches are correspondingly connected with the N input ends of the first logic OR gate one by one;
the output end of the first logic OR gate is respectively connected with the alarm indicator lamp and one input end of the second logic OR gate;
the other input end of the second logic OR gate is connected with the output signal of the liquid level meter, and the output end of the second logic OR gate is connected with the control end of the electric bypass valve.
As a further optimization scheme of the steam pipeline drainage system real-time monitoring device, all be equipped with thermal-insulated heat-shrinkable sleeve on the bimetal spring plate.
The utility model adopts the above technical scheme to compare with prior art, have following technological effect:
the utility model discloses in, the mounted position of metal spring piece can be adjusted in a flexible way, can install many temperature detect switches, realizes the hydrophobic situation of a plurality of regional pipelines of synchronous monitoring. The action fixed value of the temperature control switch can be determined according to the actual condition and the empirical value on site, the type can be flexibly selected, and the temperature control switch can be suitable for different high-temperature and low-temperature fields. The utility model discloses simple structure, convenient to use, newly-increased work load is little, and is safe energy-conserving, and monitoring efficiency is high.
Drawings
FIG. 1 is a schematic structural view of a medium steam pipeline drainage system according to the present invention;
fig. 2 is a schematic diagram of the real-time monitoring device for the steam pipeline drainage system of the present invention.
In the figure, 1-a first pipeline, 2-a second pipeline, 3-a third pipeline, 4-a first manual stop valve, 5-a liquid level meter, 6-a second manual stop valve, 7-a first manual ball valve, 8-an electric bypass valve, 9-a second manual ball valve, 10-a third manual stop valve, 11-an automatic steam trap, 12-a fourth manual stop valve, 13-a temperature control switch, 14-a first logic OR gate, 15-an alarm indicator light and 16-a second logic OR gate.
Detailed Description
The technical scheme of the utility model is further explained in detail with the attached drawings as follows:
the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, components are exaggerated for clarity.
The utility model discloses a real-time monitoring device for a steam pipeline drainage system, as shown in figure 1, the steam pipeline drainage system comprises a first pipeline, a second pipeline and a third pipeline; one end of each of the first pipeline, the second pipeline and the third pipeline is connected to a steam main pipe needing drainage, and the other end of each of the first pipeline, the second pipeline and the third pipeline is connected to a drainage tank, wherein the third pipeline is sequentially provided with a first manual ball valve, an electric bypass valve and a second manual ball valve along the drainage flow direction; the first pipeline is sequentially provided with a first manual stop valve, a liquid level meter and a second manual stop valve along the drainage flow direction; the second pipeline is sequentially provided with a third manual stop valve, an automatic steam trap and a fourth manual stop valve along the steam trap flow direction;
as shown in fig. 2, the real-time monitoring device includes N bimetal spring strips, N temperature control switches, a first logic or gate, a second logic or gate, and an alarm indicator;
the bimetal spring piece comprises two access contacts and two output ends, the two input ends of the bimetal spring piece are correspondingly connected with the two access contacts one by one, and the bimetal spring piece is used for converting temperature values of the two access contacts into electric signals and then outputting the electric signals from the corresponding output ends;
the N bimetal spring pieces are distributed on the pipe walls of the first pipeline, the second pipeline and the third pipeline, which need to be subjected to accumulated water monitoring, one access contact of each bimetal spring piece is arranged above the pipe wall, and the other access contact of each bimetal spring piece is arranged below the pipe wall;
the first logic OR gate comprises N input ends and one output end, the second logic OR gate comprises two input ends and one output end, and the first logic OR gate and the second logic OR gate are used for carrying out logic OR operation;
the temperature control switch comprises two input ends and an output end, the temperature control switch is used for comparing the difference value of the electric signals accessed by the two input ends, and when the difference value is larger than a preset voltage threshold value, the temperature control switch generates closing action to enable the output end to output high level;
the N temperature control switches correspond to the N bimetal spring pieces one by one, and two input ends of the temperature control switches are respectively connected with two output ends of the bimetal spring pieces corresponding to the temperature control switches one by one; the output ends of the N temperature control switches are correspondingly connected with the N input ends of the first logic OR gate one by one;
the output end of the first logic OR gate is respectively connected with the alarm indicator lamp and one input end of the second logic OR gate;
the other input end of the second logic OR gate is connected with the output signal of the liquid level meter, and the output end of the second logic OR gate is connected with the control end of the electric bypass valve.
As a further optimization scheme of the steam pipeline drainage system real-time monitoring device, all be equipped with thermal-insulated heat-shrinkable sleeve on the bimetal spring plate.
When the steam pipeline drainage system works normally, the first manual stop valve and the second manual stop valve on the first pipeline are in a fully-opened state, when drainage on the upstream of the liquid level meter accumulates to a high liquid level fixed value, a liquid level high alarm signal is triggered, and the drainage is sent to the automatic steam trap through a signal cable. The third manual stop valve and the fourth manual stop valve on the second pipeline are in a fully-opened state, the automatic steam trap is automatically opened to trap water after receiving a liquid level high alarm signal of the liquid level meter, and the automatic steam trap is automatically closed after lasting for a specified time, so that heat loss caused by the fact that high-temperature steam flows into the downstream is avoided. The first manual ball valve and the second manual ball valve on the third pipeline are in a full-open state, the electric bypass valve is in a closed state, when a control switch of the electric bypass valve receives a liquid level high alarm continuously triggered by the liquid level meter, the electric bypass valve is automatically opened, drain water in the pipeline is drained away, the height of the drain water liquid level is reduced, and when the liquid level high alarm signal disappears, the electric bypass valve is closed, so that heat loss caused by the fact that high-temperature steam flows into the downstream is avoided.
When hydrophobic accumulation is actually generated in the pipeline, the pipe wall of the area to be monitored has temperature difference, and the temperature difference changes along with the hydrophobic accumulation degree; when the temperature difference of the bimetal spring piece reaches a set value, the temperature control switch is prompted to generate closing action to output high level, and the high level conducts the first logic OR gate. A high level signal output by the first logic OR gate is divided into two parts, and one part is connected to an alarm indicator lamp through a cable to remind that the alarm of drainage accumulation exists at the moment; the other path is sent to the input end of a second logic OR gate through a cable to enable the second logic OR gate to output a high-level control signal, and the high-level control signal is sent to the electric bypass valve through a connecting cable and forcibly opens the valve to drain water. The first logic or gate has a delay keeping function, and after monitoring that the steam pipeline is drained, the steam pipeline accumulates and alarms, the output signal can force the electric bypass valve to be opened continuously for a period of time to drain until the liquid level high alarm signal disappears.
The utility model discloses in, the mounted position of metal spring piece can be adjusted in a flexible way, can install many temperature detect switches, realizes the hydrophobic situation of a plurality of regional pipelines of synchronous monitoring. The action fixed value of the temperature control switch can be determined according to the actual condition and the empirical value on site, the type can be flexibly selected, and the temperature control switch can be suitable for different high-temperature and low-temperature fields. The utility model discloses simple structure, convenient to use, newly-increased work load is little, and is safe energy-conserving, and monitoring efficiency is high.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The above-mentioned embodiments further describe the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit 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 (2)
1. A real-time monitoring device for a steam pipeline drainage system comprises a first pipeline, a second pipeline and a third pipeline; one end of each of the first pipeline, the second pipeline and the third pipeline is connected to a steam main pipe needing drainage, and the other end of each of the first pipeline, the second pipeline and the third pipeline is connected to a drainage tank, wherein the third pipeline is sequentially provided with a first manual ball valve, an electric bypass valve and a second manual ball valve along the drainage flow direction; the first pipeline is sequentially provided with a first manual stop valve, a liquid level meter and a second manual stop valve along the drainage flow direction; the second pipeline is sequentially provided with a third manual stop valve, an automatic steam trap and a fourth manual stop valve along the steam trap flow direction;
the real-time monitoring device is characterized by comprising N bimetal spring pieces, N temperature control switches, a first logic OR gate, a second logic OR gate and an alarm indicator light;
the bimetal spring piece comprises two access contacts and two output ends, the two output ends of the bimetal spring piece are correspondingly connected with the two access contacts one by one, and the bimetal spring piece is used for converting temperature values of the two access contacts into electric signals and then outputting the electric signals from the corresponding output ends;
the N bimetal spring pieces are distributed on the pipe walls of the first pipeline, the second pipeline and the third pipeline, which need to be subjected to accumulated water monitoring, one access contact of each bimetal spring piece is arranged above the pipe wall, and the other access contact of each bimetal spring piece is arranged below the pipe wall;
the first logic OR gate comprises N input ends and one output end, the second logic OR gate comprises two input ends and one output end, and the first logic OR gate and the second logic OR gate are used for carrying out logic OR operation;
the temperature control switch comprises two input ends and an output end, the temperature control switch is used for comparing the difference value of the electric signals accessed by the two input ends, and when the difference value is larger than a preset voltage threshold value, the temperature control switch generates closing action to enable the output end to output high level;
the N temperature control switches correspond to the N bimetal spring pieces one by one, and two input ends of the temperature control switches are respectively connected with two output ends of the bimetal spring pieces corresponding to the temperature control switches one by one; the output ends of the N temperature control switches are correspondingly connected with the N input ends of the first logic OR gate one by one;
the output end of the first logic OR gate is respectively connected with the alarm indicator lamp and one input end of the second logic OR gate;
the other input end of the second logic OR gate is connected with the output signal of the liquid level meter, and the output end of the second logic OR gate is connected with the control end of the electric bypass valve.
2. The steam pipeline drainage system real-time monitoring device of claim 1, wherein the bimetallic spring plate is provided with a heat insulating heat shrinkable sleeve.
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| CN201922343080.1U CN211716229U (en) | 2019-12-24 | 2019-12-24 | Real-time monitoring device for steam pipeline drainage system |
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| CN201922343080.1U CN211716229U (en) | 2019-12-24 | 2019-12-24 | Real-time monitoring device for steam pipeline drainage system |
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| CN110985875A (en) * | 2019-12-24 | 2020-04-10 | 南京航空航天大学 | Real-time monitoring device for steam pipeline drainage system |
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| CN110985875A (en) * | 2019-12-24 | 2020-04-10 | 南京航空航天大学 | Real-time monitoring device for steam pipeline drainage system |
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