CN215261256U - Flow guide anti-smashing system suitable for double-flow-path surface type water-cooled condenser - Google Patents
Flow guide anti-smashing system suitable for double-flow-path surface type water-cooled condenser Download PDFInfo
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- CN215261256U CN215261256U CN202121310859.4U CN202121310859U CN215261256U CN 215261256 U CN215261256 U CN 215261256U CN 202121310859 U CN202121310859 U CN 202121310859U CN 215261256 U CN215261256 U CN 215261256U
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Abstract
The utility model provides a be applicable to double-flow-pass surface type water-cooled condenser water conservancy diversion and prevent pounding system, includes double-flow-pass surface type water-cooled condenser and water conservancy diversion and prevent pounding system etc.. The utility model discloses an add the water conservancy diversion at double-flow surface formula water-cooling condenser throat and prevent pounding system, the steam turbine belongs to high-speed rotating machinery, the last stage blade is the longest one-level among the blades at all levels of steam turbine, bear the stress of the centrifugal force load of biggest and production from this, long-term operation has the fracture risk of droing, in case fall into inside the condenser, can pound bad condenser heat exchanger tube bank, lead to the condenser can not normal work, this water conservancy diversion prevents pounding the system and can avoid the steam turbine last stage blade fracture part of droing or other parts of droing directly to fall into in the condenser, carry out the water conservancy diversion to the steam turbine steam exhaust simultaneously. Through being applicable to double-flow-path surface type water-cooled condenser water conservancy diversion and preventing pounding system implementation, can prevent that the inside part that drops of steam turbine directly falls into inside the condenser, to the steam turbine steam extraction water conservancy diversion simultaneously, improve double-flow-path surface type water-cooled condenser operational safety nature and economic nature.
Description
Technical Field
The utility model belongs to power plant boiler and steam turbine system field, concretely relates to it prevents pounding system to be applicable to two flow surface formula water-cooled condenser water conservancy diversion.
Background
The condenser is a heat exchanger for condensing the exhaust steam of the steam turbine into water, and is also called a water re-condenser. The condenser is mainly used in a steam turbine power device and is divided into a water-cooling condenser and an air-cooling condenser. The condensing equipment plays a role of a cold source in the thermodynamic cycle of the steam turbine device. The exhaust temperature and the exhaust pressure of the steam turbine are reduced, and the thermal cycle efficiency can be improved. The condenser has the main functions of establishing and maintaining high vacuum at the steam exhaust port of the steam turbine and forming a complete cycle by using water condensed from the steam exhaust of the steam turbine as boiler feed water. And the condenser keeps higher vacuum degree through exchanging heat with circulating water.
The different condensers according to the steam condensation mode can be divided into a surface type (also called dividing wall type) and a mixed type (also called contact type). In a surface condenser, steam separated from a cooling medium is condensed into liquid on a cooling wall surface (usually, a metal pipe). The cooling medium may be water or air. The water-cooled surface condenser is divided into a single-flow path condenser and a double-flow path condenser according to the flowing mode of cooling water. The water-cooled surface condenser mainly comprises a shell, a tube bundle, a water chamber and the like. The exhaust steam of the steam turbine enters the shell through the throat part, is condensed into water on the cooling pipe bundle and is collected in the hot well, and is pumped out by the condensate pump. Cooling water (also called circulating water) enters the cooling tube bundle from the inlet water chamber and is discharged from the outlet water chamber. In order to ensure that high vacuum and good heat transfer effect are maintained in the condenser when steam is condensed, the condenser is also provided with air extraction equipment which continuously extracts air and other non-condensed gases which leak into the condenser. The air extraction equipment mainly comprises a water jet air extractor, a steam jet air extractor, a mechanical vacuum pump, a combined vacuum pump and the like.
The rotating speed of a steam turbine is 3000r/min, the steam turbine belongs to high-speed rotating machinery, steam works in the steam turbine along with the reduction of pressure and temperature, the expansion of volume is realized, the steam pressure of the last stage is the lowest, the required volume flow is also the highest, therefore, the last stage blade is the longest stage of all stages of blades of the steam turbine, the largest centrifugal force load and the stress generated by the centrifugal force load are borne, and the last stage blade of the steam turbine works in wet steam containing water drops for a long time, the risk of breaking and falling off exists, the centrifugal force when the last stage blade of the steam turbine falls off is very large, once the last stage blade of the steam turbine falls into a condenser, a heat exchange tube bundle arranged in the condenser can be damaged by smashing, the condenser cannot work normally, condensate water is polluted, and the safe operation of a steam turbine unit is influenced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a be applicable to two process surface formula water-cooling condenser water conservancy diversion and prevent pounding system, prevent pounding the system through add the water conservancy diversion in the throat of two process surface formula water-cooling condenser, can prevent that the inside part that drops of steam turbine directly falls into inside the condenser, carry out the water conservancy diversion to the steam turbine steam extraction simultaneously, improve the security and the economic nature of two process surface formula water-cooling condenser operation.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
a flow guide anti-smashing system suitable for a double-flow-path surface type water-cooled condenser comprises a flow guide anti-smashing system, the double-flow-path surface type water-cooled condenser and a hot well;
the top of two-flow surface type water-cooled condenser is provided with the water conservancy diversion and prevents pounding system, the bottom is provided with the hot-well, the exit linkage of hot-well is to regenerative system, be provided with circulating water import and circulating water export on the lateral wall of two-flow surface type water-cooled condenser, and still be provided with the pipeline of intercommunication circulating water import and circulating water export on the lateral wall, the lateral wall of opposite side is provided with the gyration hydroecium, the circulating water export of two-flow surface type water-cooled condenser is connected to the circulating water import of natural draft cooling tower, the circulating water export of natural draft cooling tower is connected to the circulating water import of two-flow surface type water-cooled condenser.
The utility model discloses further improvement lies in, and the water conservancy diversion is prevented pounding the throat that the system set up at double-flow journey surface formula water-cooled condenser.
The utility model discloses a further improvement lies in, the rotational speed of the steam turbine that this system is based on is 3000r/min, for high-speed rotating machinery, the last stage blade is the longest one-level among the blades of steam turbine at different levels, bear the stress that the centrifugal force load is the biggest and produce from this, long-term operation has the fracture risk of droing, and centrifugal force when the steam turbine last stage blade drops is very big, in case fall into inside two process surface type water-cooled condenser, can pound the heat exchange tube bank of arranging in the bad two process surface type water-cooled condenser, lead to two process surface type water-cooled condenser can not normally work, pollute the condensate water, centrifugal force's computational formula sees formula (1)
F＝mrω2 (1)。
The utility model discloses further improvement lies in, this water conservancy diversion prevents pounding the system and can avoid steam turbine last stage blade fracture part or other parts that drop to directly fall into double-flow-path surface type water cooled condenser in, and the part that drops that protects double-flow-path surface type water cooled condenser can not be pounded by the inside part that drops of steam turbine, improves the security of double-flow-path surface type water cooled condenser operation.
The utility model discloses further improvement lies in, this water conservancy diversion prevents pounding the system and carries out the water conservancy diversion to the steam turbine steam extraction simultaneously, makes the even income condenser of steam turbine steam extraction as far as possible, improves condenser heat exchange efficiency.
The utility model discloses further improvement lies in, and the position of the circulating water import of double-flow journey surface type water-cooled condenser is less than the position of circulating water export.
The utility model discloses further improvement lies in, condenser circulating water advances, the exit is provided with circulating water inlet valve and circulating water outlet valve respectively.
The utility model discloses further improvement lies in, and the circulating water comes out the back from circulating water outlet valve, goes the cooling of natural draft cooling tower, and the circulating water after the cooling of natural draft cooling tower gets into a flow of condenser through circulating water inlet valve, and back is through the gyration hydroecium, flows in two flows of condenser, and the condenser flows out behind circulating water and the steam turbine steam extraction countercurrent flow, cooling steam turbine steam extraction.
Compared with the prior art, the utility model discloses following profitable technological effect has at least:
the utility model discloses an add the water conservancy diversion at double-flow surface formula water-cooling condenser throat and prevent pounding system, the steam turbine belongs to high-speed rotating machinery, the last stage blade is the longest one-level among the blades at different levels of steam turbine, bear the stress that the centrifugal force load of biggest and produced from this, long-term operation has the fracture risk of droing, in case fall into inside the condenser, can pound bad condenser heat exchanger tube bank, lead to the condenser can not normal work, this water conservancy diversion prevents pounding the system and can avoid the steam turbine last stage blade fracture part of droing or other parts of droing directly to fall into in the condenser, carry out the water conservancy diversion to the steam turbine exhaust simultaneously. Through the implementation that is applicable to double-flow-path surface type water-cooling condenser water conservancy diversion and prevents pounding system, can prevent that the inside part that drops of steam turbine directly falls into inside the condenser, carry out the water conservancy diversion to the steam turbine steam extraction simultaneously, improve the security and the economic nature of double-flow-path surface type water-cooling condenser operation. In summary, the utility model has the following advantages:
(1) the steam turbine last stage blade breakage and falling part or other falling parts can be prevented from directly falling into the condenser, and the heat exchange tube bundle of the condenser is protected from being broken by smashing.
(2) The flow guide device can guide the steam discharged by the steam turbine and improve the heat exchange efficiency of the double-flow-path surface type water-cooled condenser.
(3) The system is simple, small in investment, safe and reliable.
Drawings
Fig. 1 is a schematic view of the diversion anti-smashing system applicable to the double-flow surface type water-cooled condenser.
Description of reference numerals:
1. the system comprises a diversion anti-smashing system, a double-flow-path surface type water-cooled condenser, a hot well, a circulating water inlet valve, a circulating water outlet valve and a hot well, wherein the double-flow-path surface type water-cooled condenser is 2, and the hot well is 4.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be 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 disclosure to those skilled in the art. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in fig. 1, the utility model provides a be applicable to two-flow surface type water-cooled condenser water conservancy diversion and prevent pounding system, including water conservancy diversion prevent pounding system 1, two-flow surface type water-cooled condenser 2, hot-well 3, circulating water inlet valve 4 and circulating water outlet valve 5; the side wall of the double-flow surface type water-cooling condenser 2 is provided with a circulating water inlet and a circulating water outlet, and the side wall is also provided with a steam-water pipeline communicated with the circulating water inlet and the circulating water outlet. The diversion anti-smashing system 1 is arranged at the throat part of the double-flow-path surface type water-cooled condenser 2.
The rotating speed of a steam turbine based on the system is 3000r/min, the system is a high-speed rotating machine, a last-stage blade is the longest one of all stages of blades of the steam turbine, the last-stage blade bears the largest centrifugal force load and stress generated by the largest centrifugal force load, the risk of fracture and falling off exists in long-term operation, the centrifugal force generated when the last-stage blade of the steam turbine falls off is very large, once the last-stage blade of the steam turbine falls into the double-process surface type water-cooling condenser 2, a heat exchange tube bundle arranged in the double-process surface type water-cooling condenser 2 can be broken, the double-process surface type water-cooling condenser 2 cannot normally work and is polluted by condensed water, and the calculation formula of the centrifugal force is shown in a formula (1)
F＝mrω2 (1)。
Working example 1
A600 MW steam turbine set is provided with a double-flow path surface type water-cooling condenser, the outer diameter of a heat exchange tube bundle in the condenser is 22mm, the wall thickness is 0.5mm, the material is TP316L, the effective length of the heat exchange tube bundle is 13.36m, the total length of the heat exchange tube bundle is 13.5m, the rotating speed of a steam turbine is 3000r/min, and the length of a last-stage blade of the steam turbine is 1.016 m.
The steam does work in the steam turbine and is accompanied with the reduction of pressure and temperature, the expansion of volume, because the steam pressure of last one-level is the lowest, required volume flow is also the highest, therefore the last stage blade is the longest one in the blades of all levels of steam turbine, bear the biggest centrifugal force load and the stress that produces from this, and steam turbine last stage blade long-term work has the fracture risk of droing in containing the wet steam of water droplet, and the centrifugal force when steam turbine last stage blade drops is very big, in case fall into inside the condenser, can pound the heat exchange tube bank of arranging in the condenser, lead to the condenser can not normally work, pollute the condensate water, influence the safe operation of steam turbine unit.
The diversion anti-smashing system is additionally arranged at the throat part of the double-flow-path surface type water-cooled condenser, can prevent a steam turbine final-stage blade from breaking and falling off or other falling off components from directly falling into the condenser, and conducts diversion on steam turbine exhaust steam simultaneously. Through the implementation that is applicable to double-flow-path surface type water-cooling condenser water conservancy diversion and prevents pounding system, can prevent that the inside part that drops of steam turbine directly falls into inside the condenser, carry out the water conservancy diversion to the steam turbine steam extraction simultaneously, improve the security and the economic nature of double-flow-path surface type water-cooling condenser operation.
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 (7)
1. The flow guide anti-smashing system suitable for the double-flow-path surface type water-cooled condenser is characterized by comprising a flow guide anti-smashing system (1), a double-flow-path surface type water-cooled condenser (2) and a hot well (3);
the top of two-flow surface type water-cooled condenser (2) is provided with water conservancy diversion and prevents pounding system (1), the bottom is provided with hot-well (3), the exit linkage of hot-well (3) is to regenerative system, be provided with circulating water import and circulating water export on the lateral wall of two-flow surface type water-cooled condenser (2), and still be provided with the pipeline of intercommunication circulating water import and circulating water export on the lateral wall, the lateral wall of opposite side is provided with the gyration hydroecium, the circulating water export of two-flow surface type water-cooled condenser (2) is connected to the circulating water import of natural draft cooling tower, the circulating water export of natural draft cooling tower is connected to the circulating water import of two-flow surface type water-cooled condenser (2).
2. The flow-guiding and smashing-preventing system suitable for the double-flow-path surface type water-cooled condenser is characterized in that the flow-guiding and smashing-preventing system (1) is arranged at the throat part of the double-flow-path surface type water-cooled condenser (2).
3. The flow guiding and smashing preventing system suitable for the double-flow-path surface type water-cooled condenser is characterized in that the system is based on a steam turbine with the rotating speed of 3000 r/min.
4. The flow guiding and smashing preventing system suitable for the double-flow-path surface type water-cooled condenser is characterized in that the flow guiding and smashing preventing system (1) is used for simultaneously guiding the steam turbine exhaust so that the steam turbine exhaust can be uniformly discharged into the condenser as much as possible, and the heat exchange efficiency of the condenser is improved.
5. The flow-guiding anti-smashing system suitable for the double-flow-path surface type water-cooled condenser is characterized in that the position of a circulating water inlet of the double-flow-path surface type water-cooled condenser (2) is lower than the position of a circulating water outlet.
6. The flow-guiding and smashing-preventing system suitable for the double-flow-path surface type water-cooled condenser is characterized in that a circulating water inlet valve (4) and a circulating water outlet valve (5) are respectively arranged at a circulating water inlet and a circulating water outlet of the condenser.
7. The flow guiding and smashing preventing system suitable for the double-flow-path surface type water-cooled condenser is characterized in that circulating water flows out of a circulating water outlet valve (5) and then is cooled in a natural ventilation cooling tower, the circulating water cooled in the natural ventilation cooling tower enters a flow path of the condenser (2) through a circulating water inlet valve (4) and then flows into a two flow path of the condenser (2) through a rotary water chamber, and the circulating water flows out of the condenser (2) after being subjected to countercurrent heat exchange with steam turbine exhaust steam to cool the steam turbine exhaust steam.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121310859.4U CN215261256U (en) | 2021-06-11 | 2021-06-11 | Flow guide anti-smashing system suitable for double-flow-path surface type water-cooled condenser |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121310859.4U CN215261256U (en) | 2021-06-11 | 2021-06-11 | Flow guide anti-smashing system suitable for double-flow-path surface type water-cooled condenser |
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| CN202121310859.4U Active CN215261256U (en) | 2021-06-11 | 2021-06-11 | Flow guide anti-smashing system suitable for double-flow-path surface type water-cooled condenser |
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