CN111927586A - Four-process recoverer for recovering exhaust steam of large-scale back pressure steam turbine - Google Patents
Four-process recoverer for recovering exhaust steam of large-scale back pressure steam turbine Download PDFInfo
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- CN111927586A CN111927586A CN202010630406.3A CN202010630406A CN111927586A CN 111927586 A CN111927586 A CN 111927586A CN 202010630406 A CN202010630406 A CN 202010630406A CN 111927586 A CN111927586 A CN 111927586A
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- water chamber
- steam
- water
- recoverer
- back pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
Abstract
The invention relates to the technical field of thermal power equipment, and mainly relates to a four-process recoverer for recovering exhaust steam of a large back pressure turbine. The technical scheme is as follows: a four-process recoverer for recovering exhaust steam of a large back pressure turbine comprises a shell, wherein a throat is connected to the shell and is provided with a plurality of steam inlet interfaces; the shell is internally provided with a plurality of four-process heat exchange units, each four-process heat exchange unit comprises a front water chamber, a front steering water chamber and a rear water chamber, each front water chamber comprises a water inlet cavity and a water outlet cavity, each water inlet cavity is provided with a water inlet, each water outlet cavity is provided with a water outlet, and each rear water chamber comprises a first rear water chamber and a second rear water chamber; the water inlet cavity of the front water chamber, the first rear water chamber, the front steering water chamber, the second rear water chamber and the water outlet cavity of the front water chamber are sequentially connected through cooling pipes. The invention provides a four-process recoverer for recovering exhaust steam of a large back pressure turbine, which can improve the heat exchange efficiency.
Description
Technical Field
The invention relates to the technical field of thermal power equipment, and mainly relates to a four-process recoverer for recovering exhaust steam of a large back pressure turbine.
Background
Bypass steam, steam exhaust of a drainage system, steam exhaust of a small water supply pump, overflow steam of a steam exhaust system of a back pressure machine and the like of the conventional back pressure machine set are directly exhausted into the atmosphere, so that waste of a large amount of working media and damage to the ecological environment are caused. For some large-scale back pressure units, the problems of working medium waste and environmental damage caused by very large flow of the whole main steam are more serious, and the recovery of the part of steam becomes a problem which must be faced by the back pressure machine towards large-scale development.
The recoverer is required to meet certain requirements for recovering the exhausted steam at the same time.
1. The heat load difference of the recoverers among different working conditions is large, and enough heat exchange area is needed for considering the safe and stable operation of the recoverers under various working conditions. If a conventional double-flow structure is adopted, the flow velocity of the cooling pipe of the recoverer is ensured to be within a reasonable range, and the length of the cooling pipe of the recoverer is very long, so that the recoverer is very difficult to arrange. Therefore, in order to take into account the high load condition, the heat exchange area cannot be increased by simply increasing the length of the cooling pipe, and the cross-sectional area of the cooling pipe of the recoverer needs to be set large enough to reduce the length of the cooling pipe.
2. The design of the water quantity model selection of the recoverer is difficult, and if the water quantity model selection is too small, the running backpressure of the recoverer exceeds the running limit at high load; if the water volume selection is too large, the operation under the working condition of small load is not economical, and if the operation under different water volumes with different loads is adopted, the problem of difficult switching adjustment exists. Therefore, to consider operating economy, it is necessary to control the amount of water to a moderate level.
Because the water quantity can not be overlarge and the cross-sectional area of the heat exchange tube of the recoverer is large, the flow speed of the cooling tube is low, the design requirement is not met, and the heat exchange coefficient is also low.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a four-process recoverer for recovering dead steam of a large back pressure turbine, which can improve the heat exchange efficiency.
The technical scheme adopted by the invention is as follows:
a four-process recoverer for recovering exhaust steam of a large back pressure turbine comprises a shell, wherein a throat is connected to the shell and is provided with a plurality of steam inlet interfaces; the shell is internally provided with a plurality of four-process heat exchange units, each four-process heat exchange unit comprises a front water chamber, a front steering water chamber and a rear water chamber, each front water chamber comprises a water inlet cavity and a water outlet cavity, each water inlet cavity is provided with a water inlet, each water outlet cavity is provided with a water outlet, and each rear water chamber comprises a first rear water chamber and a second rear water chamber; the water inlet cavity of the front water chamber, the first rear water chamber, the front steering water chamber, the second rear water chamber and the water outlet cavity of the front water chamber are sequentially connected through cooling pipes.
The throat part is provided with a plurality of steam inlet interfaces, so that the steam exhaust device can be introduced with steam exhaust under different working conditions. The invention adopts four-flow design, the water inlet cavity of the front water chamber, the first rear water chamber, the front steering water chamber, the second rear water chamber and the water outlet cavity of the front water chamber are connected through the cooling pipes in sequence, and then the cooling water is deflected back and forth. Under the condition that the flow rate of cooling water is low, the four-process recoverer can fully recover the heat of the dead steam, and the heat exchange rate is improved. Because the heat exchange area is large and the cooling water flow is moderate, the steam-water separator can be used as a condenser of a water supply pump turbine under the normal operation working condition, and can recover the exhaust steam of the water supply pump turbine and receive the exhaust steam of a steam turbine drainage system; receiving the exhaust steam of the steam turbine bypass system under the operation condition of the backpressure machine bypass; and receiving the overflow steam of the steam exhaust system of the back pressure machine in part of working conditions.
As a preferable scheme of the invention, the front steering water chamber is longitudinally arranged, the rear water chamber is transversely arranged, and the first rear water chamber and the second rear water chamber are vertically overlapped. The front steering water chamber is longitudinally arranged, the rear water chamber is transversely arranged, and the first rear water chamber and the second rear water chamber are vertically overlapped, so that the cooling pipe in the shell can be more compactly arranged, the space is reasonably utilized, and the volume of the recoverer is reduced.
As a preferred scheme of the invention, the plurality of steam inlets comprise a small machine steam outlet interface of a water feeding pump, a drainage system steam outlet interface, a bypass steam interface and a steam turbine steam outlet overflow interface. The heat load difference of the recoverer between different working conditions is large, and in order to consider the high-load working condition, the heat exchange area of the recoverer is not too small. When the water quantity selection type of the recoverer is designed, if the water quantity selection type is too small, the operation backpressure of the recoverer exceeds the operation limit at the time of high load; if the water quantity is too large, the operation under the working condition of small load is not economical, and the water quantity is set to be proper and the cross section area of the cooling pipe of the recoverer is larger, so that the waste steam heat recovery device is suitable for recovering the waste steam heat under various working conditions.
As a preferable aspect of the present invention, a bypass temperature and pressure reducer is connected to the bypass steam connection. The bypass temperature and pressure reducing device can control the exhaust temperature and pressure of the bypass system of the steam turbine entering the shell.
In a preferred embodiment of the present invention, a hot well for collecting and recovering condensed water is provided in the housing, and the exhaust steam is condensed and collected in the hot well after being cooled.
As the preferable scheme of the invention, the side surface of the hot well is provided with the liquid level measuring device, so that the liquid level can be measured and observed through the liquid level measuring device, and a worker can correspondingly operate the liquid level condition. The throat part is provided with a vacuumizing interface for pumping away uncondensed gas, the vacuumizing interface can be connected with a vacuumizing device, and part of uncondensed gas of steam condensed by the recoverer can be pumped away by a vacuumizing system through the vacuumizing interface.
As a preferable aspect of the present invention, the throat portion is provided with a vacuum-pumping port for pumping away non-condensed gas. The vacuumizing interface can be connected with a vacuumizing device, and part of uncondensed gas of the steam condensed by the recoverer can be pumped away by a vacuumizing system through the vacuumizing interface.
As a preferred scheme of the present invention, the number of the four-flow heat exchange units is two, and a single group of the four-flow heat exchange units can be operated independently or two groups of the four-flow heat exchange units can be operated simultaneously.
The invention has the beneficial effects that:
1. the throat part of the steam inlet pipe is provided with a plurality of steam inlet interfaces, so that the steam inlet pipe can be filled with exhaust steam under different working conditions. The invention adopts four-flow design, the water inlet cavity of the front water chamber, the first rear water chamber, the front steering water chamber, the second rear water chamber and the water outlet cavity of the front water chamber are connected through the cooling pipes in sequence, and then the cooling water is deflected back and forth. Under the condition that the flow rate of cooling water is low, the four-process recoverer can fully recover the heat of the dead steam, and the heat exchange rate is improved.
2. According to the invention, the front steering water chamber is longitudinally arranged, the rear water chamber is transversely arranged, and the first rear water chamber and the second rear water chamber are overlapped up and down, so that the cooling pipe in the shell can be more compactly arranged, the space is reasonably utilized, and the volume of the recoverer is reduced.
3. Because the heat exchange area is large and the cooling water flow is moderate, the steam-water separator can be used as a condenser of a water supply pump steam turbine under the normal operation working condition, and can recover the exhaust steam of the water supply pump steam turbine and receive the exhaust steam of a steam turbine drainage system; receiving the exhaust steam of the steam turbine bypass system under the operation condition of the backpressure machine bypass; and receiving the overflow steam of the steam exhaust system of the back pressure machine in part of working conditions. Therefore, the invention is suitable for recovering the exhaust steam under various working conditions and has strong adaptability.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a front view of the present invention;
FIG. 3 is a left side view of the present invention;
FIG. 4 is a top view of the present invention;
fig. 5 is a schematic path diagram of cooling water.
In the figure: 1-a shell; 2-throat; 3-front water chamber; 4-front steering water chamber; 5-rear water chamber; 6-bypass temperature and pressure reducing device; 21-a steam exhaust interface of a small machine of a water supply pump; 22-a drainage system exhaust interface; 23-bypass steam interface; 24-a steam turbine exhaust overflow interface; 25-evacuation interface; 31-a water inlet; 32-a water outlet; 51-a first rear water chamber; 52-second rear water chamber.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
As shown in fig. 1 to 4, the four-flow recoverer for recovering exhaust steam of a large back pressure turbine of the present embodiment includes a housing 1, a throat portion 2 is connected to the housing 1, and the throat portion 2 is provided with a plurality of steam inlet ports; a plurality of four-process heat exchange units are arranged in the shell 1, each four-process heat exchange unit comprises a front water chamber 3, a front steering water chamber 4 and a rear water chamber 5, each front water chamber 3 comprises a water inlet cavity and a water outlet cavity, each water inlet cavity is provided with a water inlet 31, each water outlet cavity is provided with a water outlet 32, and each rear water chamber 5 comprises a first rear water chamber 51 and a second rear water chamber 52; the water inlet cavity of the front water chamber 3, the first rear water chamber 51, the front steering water chamber 4, the second rear water chamber 52 and the water outlet cavity of the front water chamber 3 are sequentially connected through cooling pipes.
The plurality of steam inlets comprise a small machine steam outlet port 21 of a water feeding pump, a drainage system steam outlet port 22, a bypass steam port 23 and a steam turbine steam outlet overflow port 24. The heat load difference of the recoverer between different working conditions is large, and in order to consider the high-load working condition, the heat exchange area of the recoverer is not too small. When the water quantity selection type of the recoverer is designed, if the water quantity selection type is too small, the operation backpressure of the recoverer exceeds the operation limit at the time of high load; if the water quantity is too large, the operation under the working condition of small load is not economical, and the water quantity is set to be proper and the cross section area of the cooling pipe of the recoverer is larger, so that the waste steam heat recovery device is suitable for recovering the waste steam heat under various working conditions.
The invention adopts four-flow design, the water inlet cavity of the front water chamber 3, the first rear water chamber 51, the front steering water chamber 4, the second rear water chamber 52 and the water outlet cavity of the front water chamber 3 are connected through the cooling pipes in sequence, and then the cooling water is deflected back and forth. Therefore, the invention adopts a four-flow design, increases the heat exchange area and improves the heat exchange efficiency under the condition of not increasing the straight length of the heat exchange pipeline. The invention can effectively avoid the problem of low heat exchange efficiency caused by low flow velocity of cooling water when a cooling pipe with a large cross section area and small water volume is adopted.
And under the normal working condition, the recoverer is used as a condenser of the water feeding pump turbine, and is used for recovering the exhaust steam of the water feeding pump turbine and receiving the exhaust steam of a steam turbine drainage system. The waste steam of the water feeding pump turbine is introduced from a small machine steam exhaust interface 21 of the water feeding pump, and the steam exhaust of the steam turbine drainage system is introduced from a steam exhaust interface 22 of the drainage system. And receiving the exhaust steam of the turbine bypass system under the operation working condition of the backpressure machine bypass, and introducing the exhaust steam of the turbine bypass system from a bypass steam interface 23. And receiving the overflow steam of the steam exhaust system of the back pressure machine in part of working conditions, wherein the overflow steam of the steam exhaust system is introduced from the steam exhaust overflow interface 24 of the steam turbine. And a bypass temperature and pressure reducer 6 is connected to the bypass steam interface 23 and can control the exhaust steam temperature and pressure of the steam turbine bypass system entering the shell 1. The exhaust steam flows fully in the area between the shell 1 and the pipeline, and effective heat exchange is guaranteed. The cooling water with a proper amount of water is introduced from the water inlet 31 of the front water chamber 3, and the cooling water flows through the first rear water chamber 51, the front steering water chamber 4, the second rear water chamber 52 in sequence and then flows out from the water outlet 32 of the front water chamber 3. The exhaust steam and cooling water exchange heat fully, and working medium is effectively recovered.
A hot well is arranged in the shell 1, and exhaust steam is condensed and gathered in the hot well after being cooled. The hot well side is provided with liquid level measurement device, and the accessible liquid level measurement device measures and observes the liquid level, and the staff can carry out corresponding operation to the liquid level condition. The throat part 2 is provided with a vacuumizing interface 25 for pumping away uncondensed gas, the vacuumizing interface 25 can be connected with a vacuumizing device, and part of uncondensed gas of steam condensed by the recoverer can be pumped away by a vacuumizing system through the vacuumizing interface 25.
As shown in fig. 5, in order to save space, the front turn header 4 is disposed longitudinally, the rear header 5 is disposed transversely, and the first rear header 51 and the second rear header 52 are overlapped vertically. When the recoverer operates, cooling water enters the recoverer through a cooling water inlet of the front water chamber 3, flows through the first rear water chamber 51 after passing through a cooling pipe in the region, and realizes left-right steering in the first rear water chamber 51. The cooling water passes through the cooling pipe in the corresponding area and flows through the front steering water chamber 4 to realize the up-and-down steering. Then, the cooling water flows to the second rear water chamber 52 through the cooling pipes in the corresponding regions, and the left and right directions are reversed again. Finally, the cooling water flows to the water outlet of the front water chamber 3 through the cooling pipe of the corresponding area and flows out of the recoverer, and a four-flow cooling process is completed. Therefore, the cooling pipes in the housing 1 can be arranged more compactly, the space is reasonably utilized, and the volume of the recoverer is reduced.
The number of the four-process heat exchange units is two, and a single group of the four-process heat exchange units can operate independently or two groups of the four-process heat exchange units can operate simultaneously.
The invention is not limited to the above alternative embodiments, and any other various forms of products can be obtained by anyone in the light of the present invention, but any changes in shape or structure thereof, which fall within the scope of the present invention as defined in the claims, fall within the scope of the present invention.
Claims (8)
1. A four-process recoverer for recovering exhaust steam of a large back pressure turbine is characterized by comprising a shell (1), wherein a throat (2) is connected to the shell (1), and a plurality of steam inlet interfaces are arranged on the throat (2); the shell (1) is internally provided with a plurality of four-process heat exchange units, each four-process heat exchange unit comprises a front water chamber (3), a front steering water chamber (4) and a rear water chamber (5), each front water chamber (3) comprises a water inlet cavity and a water outlet cavity, each water inlet cavity is provided with a water inlet (31), each water outlet cavity is provided with a water outlet (32), and each rear water chamber (5) comprises a first rear water chamber (51) and a second rear water chamber (52); the water inlet cavity of the front water chamber (3), the first rear water chamber (51), the front steering water chamber (4), the second rear water chamber (52) and the water outlet cavity of the front water chamber (3) are sequentially connected through cooling pipes.
2. The four-flow recoverer for recovering dead steam of a large back pressure turbine according to claim 1, wherein the front turn water chamber (4) is arranged longitudinally, the rear water chamber (5) is arranged transversely, and the first rear water chamber (51) and the second rear water chamber (52) are overlapped up and down.
3. The four-process recoverer for recovering dead steam of a large back pressure turbine as claimed in claim 1, wherein the plurality of steam inlets comprise a feed pump turbine steam outlet (21), a drainage system steam outlet (22), a bypass steam outlet (23) and a turbine steam outlet overflow (24).
4. The four-process recoverer for recovering dead steam of the large back pressure turbine as claimed in claim 3, wherein a bypass temperature and pressure reducing device (6) is connected to the bypass steam interface (23).
5. The four-pass recoverer for exhaust steam recovery of a large back pressure turbine according to claim 1, wherein a hot well for collecting and recovering incoming steam condensate is provided in the casing (1).
6. The four-process recoverer for recovering dead steam of the large back pressure turbine as claimed in claim 5, wherein a liquid level measuring device is arranged on the side surface of the hot well.
7. The four-pass recuperator for exhaust steam recovery of large back pressure turbines according to claim 1, characterized in that said throat (2) is provided with a vacuum extraction port (25) for extracting non-condensed gases.
8. The four-flow recoverer for recovering dead steam of the large back pressure turbine as claimed in any one of claims 1 to 7, wherein the number of the four-flow heat exchange units is two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010630406.3A CN111927586A (en) | 2020-07-03 | 2020-07-03 | Four-process recoverer for recovering exhaust steam of large-scale back pressure steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010630406.3A CN111927586A (en) | 2020-07-03 | 2020-07-03 | Four-process recoverer for recovering exhaust steam of large-scale back pressure steam turbine |
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| CN111927586A true CN111927586A (en) | 2020-11-13 |
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| CN202010630406.3A Pending CN111927586A (en) | 2020-07-03 | 2020-07-03 | Four-process recoverer for recovering exhaust steam of large-scale back pressure steam turbine |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0001844A2 (en) * | 1977-11-09 | 1979-05-16 | Q-Dot Corporation | Apparatus for recovering heat and process for producing steam |
| CN2530042Y (en) * | 2002-04-05 | 2003-01-08 | 东方汽轮机厂 | Direct air cooling turbine steam exhauster for power station |
| US20040104017A1 (en) * | 2001-05-31 | 2004-06-03 | Joachim Franke | Device for coolant cooling in a gas turbine and gas and steam turbine with said device |
| US20090293478A1 (en) * | 2008-05-23 | 2009-12-03 | Hitachi, Ltd. | Condenser and steam turbine power plant |
| CN209214394U (en) * | 2018-12-17 | 2019-08-06 | 哈尔滨汽轮机厂辅机工程有限公司 | A kind of condenser with four processes |
-
2020
- 2020-07-03 CN CN202010630406.3A patent/CN111927586A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0001844A2 (en) * | 1977-11-09 | 1979-05-16 | Q-Dot Corporation | Apparatus for recovering heat and process for producing steam |
| US20040104017A1 (en) * | 2001-05-31 | 2004-06-03 | Joachim Franke | Device for coolant cooling in a gas turbine and gas and steam turbine with said device |
| CN2530042Y (en) * | 2002-04-05 | 2003-01-08 | 东方汽轮机厂 | Direct air cooling turbine steam exhauster for power station |
| US20090293478A1 (en) * | 2008-05-23 | 2009-12-03 | Hitachi, Ltd. | Condenser and steam turbine power plant |
| CN209214394U (en) * | 2018-12-17 | 2019-08-06 | 哈尔滨汽轮机厂辅机工程有限公司 | A kind of condenser with four processes |
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Application publication date: 20201113 |