CN211448777U - Shaft seal temperature reduction water system - Google Patents
Shaft seal temperature reduction water system Download PDFInfo
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- CN211448777U CN211448777U CN201922024532.XU CN201922024532U CN211448777U CN 211448777 U CN211448777 U CN 211448777U CN 201922024532 U CN201922024532 U CN 201922024532U CN 211448777 U CN211448777 U CN 211448777U
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- water
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- supply pipe
- water supply
- temperature
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 161
- 230000009467 reduction Effects 0.000 title abstract description 17
- 239000008399 tap water Substances 0.000 claims 2
- 235000020679 tap water Nutrition 0.000 claims 2
- 230000001105 regulatory effect Effects 0.000 description 7
- 238000007789 sealing Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000003416 augmentation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
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Abstract
The embodiment of the utility model discloses axle seal temperature reduction water system relates to bearing seal system technical field, including temperature reduction water delivery pipe and reposition of redundant personnel water pipe, the one end and the condensate mother pipe intercommunication of temperature reduction water delivery pipe, the other end of temperature reduction water delivery pipe are equipped with the nozzle, are provided with the accent door of control aperture on the temperature reduction water delivery pipe, the one end and the temperature reduction water delivery pipe intercommunication of reposition of redundant personnel water pipe, and the junction of reposition of redundant personnel water pipe and temperature reduction water delivery pipe is located between accent door and the nozzle. Through set up the reposition of redundant personnel water pipe that is used for the reposition of redundant personnel on the desuperheating water delivery pipe for the water yield that delivers to the nozzle through the desuperheating water delivery pipe reduces, for the water pressure and the water yield of guaranteeing the nozzle, just need increase the aperture of accent door, so can make the aperture grow of accent door, behind the aperture grow, the linearity becomes good, the follow-up regulation water supply pressure and the water yield of being convenient for, thereby solve the accent door because the throttle leads to water pressure to reduce by a wide margin under the very little circumstances of aperture, lead to the problem that the part desuperheating water fails.
Description
Technical Field
The embodiment of the utility model provides a shaft seal system technical field, concretely relates to shaft seal cooling water system.
Background
The shaft seal system of the steam turbine is a key device of the unit. From the perspective of safety, the main function of the device is to prevent steam from leaking outwards along the shaft ends of the high-pressure and medium-pressure cylinders and even entering the bearing box, so that water is mixed into lubricating oil; at the same time, air must be prevented from leaking into the cylinder and destroying the vacuum of the device; from the economic perspective, it is that the recovery leaks heat, reduces the loss, can effectively improve unit operating efficiency.
Currently, most of the existing shaft seal systems adopt self-sealing shaft seal systems. The self-sealing shaft sealing system is a low-pressure cylinder steam sealing system which is used for cooling leaked steam from shaft ends of a high-pressure cylinder and a medium-pressure cylinder by water spraying after the equipment normally operates and then supplying the steam. During the initial start-up phase or low load operation phase of the plant, the supply steam for the shaft sealing arrangement is obtained from external auxiliary steam. The steam sealing system can be automatically switched according to the steam supply requirement of the unit in the whole process from the unit starting stage to the full-load operation stage. Because the low-pressure shaft seal steam source is used for steam supply after the high-pressure shaft seal steam source is sprayed and cooled, the temperature fluctuation of the low-pressure shaft seal is large when the unit is started and stopped, and the safe and stable operation of the unit is further influenced.
A330 MW subcritical, single-shaft and intermediate reheating direct air-cooled condensing steam turbine adopts a self-sealing shaft seal system. A steam temperature control station is arranged on a low-pressure steam seal steam supply pipeline, and the purpose is to maintain the steam supply temperature of the low-pressure shaft seal.
As shown in figure 1, the steam supply temperature of the low-pressure shaft seal is maximum to 183 ℃ and minimum to 104 ℃ in the starting stage of the unit. Steam turbine bearing seal supplies vapour because the steam superheat degree is very little after the temperature reduces by a wide margin, leads to bearing seal system ponding easily, simultaneously, because the unit starts tests such as the initial stage need be done the friction test, beat the floodgate and the valve tightness, the test process experiences the rapid augmentation process again after the rotor slows down many times, and the rotor will arouse great alternating thermal stress at this in-process, seriously threatens the safe operation of bearing seal and whole unit.
As shown in FIG. 2, during the low load deep peak shaving process of the unit, the temperature of the low-pressure shaft seal is greatly reduced after the temperature is reduced by spraying water due to the temperature fluctuation of the low-pressure shaft seal, and the low-pressure shaft seal is difficult to return when the temperature is lower than 121 ℃ for a long time. In order to avoid the great fluctuation of the shaft seal temperature, an operator tries to manually intervene and adjust the shaft seal temperature-reducing water regulating valve by partially closing a front manual door, so that the labor cost is increased, and the effect is not good.
The above problems occur because the valve linearity is poor when the superheat degree of the shaft seal steam source is reduced in the low-load stage and the opening degree of the shaft seal temperature-reducing water valve is less than 5%.
And (3) reducing the superheat degree of a shaft seal steam source at a low-load stage: after the unit load is higher than 160MW, the shaft seal temperature is stable, the fluctuation stage occurs in the unit low-load deep peak regulation stage and the unit start-stop stage, and the auxiliary steam superheat degree is low and the temperature is unstable in the start-stop stage through parameter retrieval; in the low-load stage, because the load is reduced, the steam leakage of the shaft seal of the high-pressure cylinder and the intermediate-pressure cylinder cannot meet the steam consumption of the low-pressure shaft seal, the steam for the shaft seal needs to be supplemented by four-stage steam extraction, and in the low-load working condition, auxiliary steam is adopted as a supplementary steam source and is supplied by the four-stage steam extraction of the unit in the stage; the low-pressure shaft seal can meet the requirements after being subjected to temperature reduction by a small amount of low-temperature desuperheating water in a low-load deep peak regulation stage of a unit and a start-stop stage of the unit due to the fact that the superheat degree of a steam source of the high-pressure shaft seal is reduced, and even the temperature of the low-pressure shaft seal is lower than a specified value for a long time in the start-up stage.
When the opening degree of the shaft seal temperature-reducing water regulating valve is lower than 5%, the linearity of the regulating valve is poor: the low-pressure shaft seal temperature-reducing water source is taken from a condensate water main pipe, and because the pressure of a condensate water system is high, the temperature-reducing water amount entering the shaft seal system is still a little under the condition that the opening of a low-pressure shaft seal temperature-reducing water regulating valve is small; and under the condition that the opening degree of the low-pressure shaft seal temperature-reducing water regulating valve is lower than 5%, the automatic opening degree of the regulating valve is greatly swung due to poor linearity of the regulating valve, especially under the condition that the opening degree is very small, the water pressure is greatly reduced due to throttling, part of the temperature-reducing water cannot be completely vaporized after passing through the nozzle, and certain accumulated water is formed in a low-pressure shaft seal pipeline.
SUMMERY OF THE UTILITY MODEL
Therefore, the embodiment of the utility model provides a shaft seal temperature-reducing water system to solve among the prior art because the governing is linear relatively poor, the water pressure that the aperture is little under the condition throttling and lead to reduces by a wide margin, partial temperature-reducing water can not vaporize completely, form the problem of certain ponding at low pressure bearing seal pipeline behind the nozzle.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
according to the utility model discloses an aspect, a shaft seal temperature reduction water system, it includes temperature reduction water supply pipe and reposition of redundant personnel water pipe, the one end and the condensate mother pipe intercommunication of temperature reduction water supply pipe, the other end of temperature reduction water supply pipe is equipped with the nozzle be provided with the accent door of control aperture on the temperature reduction water supply pipe, the one end of reposition of redundant personnel water pipe with temperature reduction water supply pipe intercommunication, and the junction of reposition of redundant personnel water pipe and temperature reduction water supply pipe is located between accent door and the nozzle.
Furthermore, a first manual door for controlling the opening degree is arranged on the water diversion pipe.
Further, the internal diameter of reposition of redundant personnel water pipe is 25 mm.
Furthermore, the shaft seal desuperheating water system also comprises a demineralized water supply pipe, one end of the demineralized water supply pipe is communicated with the desuperheating water supply pipe, and the joint of the demineralized water supply pipe and the desuperheating water supply pipe is positioned between the joint of the diversion water pipe and the desuperheating water supply pipe and the nozzle.
Furthermore, a second manual door for controlling the opening degree is arranged on the demineralized water supply pipe.
Furthermore, a third manual door is arranged on the desuperheating water supply pipe and is positioned between the desuperheating water supply pipe and the joint of the demineralized water supply pipe and the diversion water pipe.
The embodiment of the utility model provides a have following advantage:
the embodiment of the utility model provides a shaft seal temperature-reducing water system, through set up the reposition of redundant personnel water pipe that is used for the reposition of redundant personnel on the temperature-reducing water delivery pipe, make the water yield that delivers to the nozzle through the temperature-reducing water delivery pipe reduce, for water pressure and the water yield of guaranteeing the nozzle, just need increase the aperture of accent door, so can make the aperture grow of accent door, behind the aperture grow, linearity becomes good, be convenient for follow-up regulation water supply pressure and water yield, thereby solve the accent door because the throttle leads to water pressure to reduce by a wide margin under the very little condition of aperture, lead to the problem that partial temperature-reducing water fails complete.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structure, ratio, size and the like shown in the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention has no technical essential significance, and any structure modification, ratio relationship change or size adjustment should still fall within the range which can be covered by the technical content disclosed by the present invention without affecting the efficacy and the achievable purpose of the present invention.
FIG. 1 is a graph of steam supply temperature of a low-pressure shaft seal at a start-up stage of a unit in the background art;
FIG. 2 is a graph of steam supply temperature of the low-pressure shaft seal during the low-load deep peak shaving process of the unit in the background art;
fig. 3 is a schematic view of a shaft seal temperature-reducing water system provided in embodiment 1 of the present invention;
FIG. 4 is a graph showing the variation of the low pressure shaft seal temperature during the low load phase of the train after the shaft seal desuperheating water system is used.
In the figure: 1-a desuperheating water supply pipe, 2-a shunt water pipe, 3-a demineralized water supply pipe, 4-an adjusting door, 5-a first manual door, 6-a second manual door and 7-a third manual door.
Detailed Description
The present invention is described in terms of specific embodiments, and other advantages and benefits of the present invention will become apparent to those skilled in the art from the following disclosure. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the present specification, the terms "upper", "lower", "left", "right", "middle", and the like are used for the sake of clarity only, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof are also considered to be the scope of the present invention without substantial changes in the technical content.
Example 1
As shown in fig. 3, embodiment 1 provides a shaft seal temperature-reducing water system, which has a structure substantially the same as the existing structure, and includes a temperature-reducing water supply pipe 1, one end of the temperature-reducing water supply pipe 1 is communicated with a condensate main pipe, the other end of the temperature-reducing water supply pipe 1 is provided with a nozzle, and the temperature-reducing water supply pipe 1 is provided with an opening-controlling shutter 4; the difference lies in that the shaft seal temperature-reducing water system also comprises a diversion water pipe 2, one end of the diversion water pipe 2 is communicated with the temperature-reducing water supply pipe 1, the joint of the diversion water pipe 2 and the temperature-reducing water supply pipe 1 is positioned between the adjusting door 4 and the nozzle, and the other end of the diversion water pipe 2 leads to an accident evacuation place or a water pool.
The inherent problem of the valve is that the linearity is poor under the condition that the opening degree of the adjusting valve 4 is lower than 5 percent, and the problem cannot be solved. If the opening of the adjusting door 4 is directly increased, water accumulation can be caused. Because the pressure of the condensate system is high, when the opening degree of the adjusting door 4 is 5%, the amount of the desuperheating water entering the shaft seal system is still large. Through set up the reposition of redundant personnel water pipe 2 that is used for the reposition of redundant personnel on desuperheating water delivery pipe 1, make the water yield that delivers to the nozzle through desuperheating water delivery pipe 1 reduce, for the water pressure and the water yield of guaranteeing the nozzle, just need increase the aperture of accent door 4, so can make the aperture grow of accent door 4, after the aperture grow, the linearity becomes good, be convenient for follow-up regulation water supply pressure and water yield, thereby solve accent door 4 because the throttle leads to water pressure to reduce by a wide margin under the very little circumstances of aperture, lead to the problem that partial desuperheating water fails complete vaporization behind the nozzle.
In the present embodiment, the diversion water pipe 2 is provided with a first manual door 5 for controlling the opening degree. Through first manual door 5, can adjust the water speed of crossing or the volume of crossing of reposition of redundant personnel water pipe 2, the water pressure, the water yield of nozzle department can be ensured in the cooperation of adjusting 4 of desuperheating water delivery pipe 1.
In this embodiment, the internal diameter of reposition of redundant personnel water pipe 2 is 25mm, can effectively guarantee the effect of reposition of redundant personnel, when the reposition of redundant personnel effect is big on the large side, can adjust through first hand door 5.
Under the house service stops the condition entirely, the low pressure bearing seal temperature that can lead to is overtemperature after the interruption of low pressure bearing seal desuperheating water, for the emergence of avoiding this kind of condition, bearing seal desuperheating water system still includes demineralized water supply pipe 3, demineralized water supply pipe 3's one end and desuperheating water supply pipe 1 intercommunication, and demineralized water supply pipe 3 is located between reposition of redundant personnel water pipe 2 and the junction and the nozzle of desuperheating water supply pipe 1 with the junction of desuperheating water supply pipe 1. And under the condition that the service power is completely stopped, the demineralized water supply pipe 3 supplies water to the shaft seal desuperheating water system. In order to control the opening and closing of the demineralized water supply pipe 3, a second manual door 6 for controlling the opening degree is provided on the demineralized water supply pipe 3. In order to prevent the overflow of the demineralized water from the divided water pipe 2, a third manual door 7 is provided on the desuperheating water supply pipe 1, and the third manual door 7 is located between the junctions of the desuperheating water supply pipe 1 and the demineralized water supply pipe 3 and the divided water pipe 2.
After the unit is started, the low-pressure shaft seal still fluctuates after an operator opens the first manual door 5 for about half a turn, but the fluctuation range is obviously reduced; after gradually opening first hand door 5 to the round, discover after the transfer gate 4 aperture exceeds 8% aperture, as shown in fig. 4, low pressure bearing seal temperature tends to stable, so far, the long-term potential safety hazard of this factory unit opening and shutting down and low-load operation stage low pressure bearing seal temperature fluctuation by a wide margin has obtained effectual solution, provides the engineering technology mode of reference for the same type unit solution this kind of problem simultaneously.
Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (6)
1. The shaft seal temperature-reducing water system is characterized by comprising a temperature-reducing water supply pipe and a shunt water pipe, wherein one end of the temperature-reducing water supply pipe is communicated with a condensate main pipe, a nozzle is arranged at the other end of the temperature-reducing water supply pipe, an adjusting door for controlling the opening degree is arranged on the temperature-reducing water supply pipe, one end of the shunt water pipe is communicated with the temperature-reducing water supply pipe, and the joint of the shunt water pipe and the temperature-reducing water supply pipe is positioned between the adjusting door and the nozzle.
2. The shaft seal reduced temperature water system as claimed in claim 1, wherein a first manual door for controlling the opening degree is provided on the tap water pipe.
3. The shaft seal reduced temperature water system of claim 1, wherein the internal diameter of the tap water pipe is 25 mm.
4. The shaft seal desuperheating water system of claim 1, further comprising a demineralized water supply pipe, wherein one end of the demineralized water supply pipe is communicated with the desuperheating water supply pipe, and a joint of the demineralized water supply pipe and the desuperheating water supply pipe is located between a joint of the diversion water pipe and the desuperheating water supply pipe and the nozzle.
5. The shaft seal reduced temperature water system as claimed in claim 4, wherein a second manual door for controlling the opening degree is provided on the supply pipe of the demineralized water.
6. The shaft seal reduced temperature water system as claimed in claim 4, wherein a third manual door is provided on the reduced temperature water supply pipe, the third manual door being located between the reduced temperature water supply pipe and a junction of the demineralized water supply pipe and the diverter water pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922024532.XU CN211448777U (en) | 2019-11-21 | 2019-11-21 | Shaft seal temperature reduction water system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922024532.XU CN211448777U (en) | 2019-11-21 | 2019-11-21 | Shaft seal temperature reduction water system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211448777U true CN211448777U (en) | 2020-09-08 |
Family
ID=72298641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922024532.XU Expired - Fee Related CN211448777U (en) | 2019-11-21 | 2019-11-21 | Shaft seal temperature reduction water system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211448777U (en) |
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2019
- 2019-11-21 CN CN201922024532.XU patent/CN211448777U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200908 |