CN212408282U - Steam drainage system - Google Patents
Steam drainage system Download PDFInfo
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- CN212408282U CN212408282U CN202021538653.2U CN202021538653U CN212408282U CN 212408282 U CN212408282 U CN 212408282U CN 202021538653 U CN202021538653 U CN 202021538653U CN 212408282 U CN212408282 U CN 212408282U
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Abstract
The utility model discloses a steam drainage system, which comprises a steam trap module, an emergency drain valve, a drainage receiver and the like; the steam trap module comprises a two-stage series steam trap consisting of a first-stage steam trap and a second-stage steam trap, wherein the second-stage steam trap is provided with a regulating valve, and both the first-stage steam trap and the second-stage steam trap have the functions of water passing and steam blocking; the export of high-pressure steam container connects in the entry of hydrophobic bag, and the export of hydrophobic bag is divided into two strands, and the one strand connects in the entry of emergency drain valve, and another strand connects in the entry of one-level steam trap, and the export of emergency drain valve connects in the first entry of hydrophobic receiver, and the export of one-level steam trap connects in the entry of second grade steam trap, and the first export of second grade steam trap connects in the second entry of hydrophobic receiver, and the export of second grade steam trap second connects in the entry of governing valve, and the export of governing valve connects in the entry of low-pressure steam container. The utility model discloses a two-stage series connection steam trap has solved the hydrophobic problem that exists of nuclear power station steam turbine extraction steam pipe.
Description
Technical Field
The utility model belongs to the technical field of the nuclear power, concretely relates to hydrophobic system of steam.
Background
The steam turbine of the pressurized water reactor nuclear power plant is a saturated steam turbine, the steam extraction humidity of the steam turbine is high, and in the running process of a unit, more hydrophobic water exists in a steam extraction pipeline of the steam turbine, and the hydrophobic water must be discharged in time, but the steam cannot be discharged while the hydrophobic water is discharged, so that a steam trap with the functions of draining water and blocking steam must be used.
The existing water drainage system has the following problems:
(1) when the pressure difference between the inlet and the outlet of the steam trap is relatively large, the water is not drained smoothly.
The pressure of a steam extraction pipeline of the steam turbine is higher, and the pressure and the temperature in the steam trap and the pipeline in front of the steam trap are higher; draining the drained water to a condenser through a steam trap, wherein the condenser is under negative pressure, and the pressure in a pipeline behind the steam trap is lower; therefore, the differential pressure between the inlet and the outlet of the steam trap is relatively large.
The working principle of the steam trap is that when accumulated water exists in the steam trap, the steam trap opens the drain valve to drain water, and when the accumulated water does not exist in the steam trap, the drain valve of the steam trap is closed.
The steam trap with large inlet-outlet differential pressure ratio is characterized in that when the water level in the steam trap is high and the drain valve is opened for draining, the interior of the steam trap is communicated with a low-pressure pipeline behind the steam trap, the internal pressure of the steam trap is rapidly reduced, so that high-temperature and high-pressure drainage in the steam trap is rapidly vaporized, the drain valve of the steam trap is immediately closed, and drainage of the steam trap is stopped. Therefore, the effective drainage time of the steam trap is short, the drainage efficiency is poor, and the drainage is not smooth.
(2) The steam trap is frequently discharged, and the cold and hot alternation of the pipeline behind the steam trap is easy to generate thermal stress, so that the weak link is cracked and leaked;
the steam trap is opened because of the drain valve, so that the internal pressure is suddenly reduced to vaporize the water in the valve, and the drain valve is rapidly closed after being opened for a short time. After the drain valve of the steam trap is closed, the pressure in the steam trap is gradually recovered to be normal, and because how much water is not discharged after the drain valve is opened last time, the water level in the steam trap quickly promotes the drain valve of the steam trap to be opened again.
The drain valve of the steam trap is opened to discharge high-temperature steam, closed again in a short time, and then opened again in cycles, and the high-frequency switch ensures that the drain of the steam trap is not smooth on one hand, and ensures that a pipeline behind the steam trap bears high-frequency temperature alternation and pressure alternation on the other hand, and the pipeline generates fatigue cracking in a weak link.
(3) The emergency drain valve is frequently opened and closed, so that the emergency drain valve is easy to damage, and the cold and hot alternation of a pipeline behind the steam trap is easy to generate thermal stress, so that a weak link is cracked and leaked;
the drainage of the steam trap is not smooth, so that the drained water is accumulated to the drainage bag, the water level switch is triggered to act, the emergency drainage valve is triggered to open, the water level is reduced and the emergency drainage valve is closed after the emergency drainage valve is opened, but the water level rapidly rises due to the fact that the drainage of the steam trap is not smooth, and the emergency drainage valve is opened again. Frequent opening and closing of the emergency drain valve increase the vibration of the emergency drain valve and pipelines thereof, and damage to the emergency drain valve is caused. The pipeline behind the emergency trap bears high-frequency temperature alternation and pressure alternation, and the pipeline generates fatigue cracking in a weak link.
Disclosure of Invention
An object of the utility model is to provide a hydrophobic system of steam to the problem that present nuclear power station steam turbine extraction pipeline water delivery exists.
In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:
a steam drainage system comprises a steam trap module, a drainage bag, an emergency drainage valve, a high-pressure steam container, a drainage receiver and a low-pressure steam container; wherein the content of the first and second substances,
the steam trap module comprises a two-stage series steam trap consisting of a first-stage steam trap and a second-stage steam trap, wherein the second-stage steam trap is provided with a regulating valve, and both the first-stage steam trap and the second-stage steam trap have the functions of water passing and steam blocking;
the export of high-pressure steam container connects in the entry of hydrophobic bag, and the export of hydrophobic bag is divided into two strands, and the one strand connects in the entry of emergency drain valve, and another strand connects in the entry of one-level steam trap, and the export of emergency drain valve connects in the first entry of hydrophobic receiver, and the export of one-level steam trap connects in the entry of second grade steam trap, and the first export of second grade steam trap connects in the second entry of hydrophobic receiver, and the export of second grade steam trap second connects in the entry of governing valve, and the export of governing valve connects in the entry of low-pressure steam container.
The utility model has the further improvement that a liquid level switch is arranged in the drain bag.
Compared with the prior art, the utility model discloses following advantage has:
the utility model provides a pair of hydrophobic system of steam, this system has following several obvious advantages in the aspect compared with the system that uses usually at present:
(1) drainage is unobstructed in high differential pressure systems.
The utility model provides a pair of steam drainage's system adopts the two-stage steam trap of establishing ties, and the drainage of one-level steam trap gets into the second grade steam trap. When the first-stage steam trap discharges water, the second-stage steam trap is closed; the water in the first-level steam trap is discharged into the second-level steam trap and then is expanded, reduced in pressure and cooled to generate hydrophobic steam, the pressure in the second-level steam trap can be adjusted by the adjusting valve of the second-level steam trap to enable the differential pressure between the second-level steam trap and the first-level steam trap to be smaller, and when the first-level steam trap is prevented from draining, the water in the steam trap is vaporized, and the drainage is more thorough. After the steam in the second-stage steam trap is discharged, the internal pressure and the temperature of the steam trap are reduced, and the differential pressure in the pipeline at the rear part of the steam trap is reduced, so that when the second-stage steam trap discharges water, the water in the second-stage steam trap cannot be vaporized suddenly, and the drainage of the steam trap is smooth.
(2) Part of heat and working medium can be recovered.
The pressure in the secondary steam trap is adjusted through the adjusting valve of the secondary steam trap, steam and water in the secondary steam trap can be recycled to a steam and water system with lower pressure, partial heat and working media are recycled, and the energy-saving effect is achieved.
(3) The frequent opening of the emergency drain valve is avoided, and the damage of the emergency drain valve is reduced.
Because the drainage of the steam trap is smooth, accumulated water hardly reaches the drainage bag, the emergency drainage valve cannot be opened frequently, and the damage probability of the emergency drainage valve is reduced.
(4) The thermal stress fatigue cracking of the pipeline behind the steam trap caused by temperature and pressure alternation is avoided.
Drawings
Fig. 1 is a block diagram of a steam trap system according to the present invention.
Description of reference numerals:
1. steam trap module, 2, drain bag, 3, emergency drain valve, 4, one-level steam trap, 5, second grade steam trap, 6, governing valve, 7, high pressure steam container, 8, hydrophobic receiver, 9, low pressure steam container.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the utility model provides a steam trap system, which comprises a steam trap module 1, a trap bag 2, an emergency drain valve 3, a high-pressure steam container 7, a trap receiver 8 and a low-pressure steam container 9; the steam trap module 1 comprises a two-stage series steam trap consisting of a first-stage steam trap 4 and a second-stage steam trap 5, a regulating valve 6 is arranged on the second-stage steam trap 5, and the first-stage steam trap 4 and the second-stage steam trap 5 have the functions of water and steam passing and blocking; the export of high-pressure steam container 7 is connected in the entry of drain bag 2, the export of drain bag 2 is divided into two strands, the one strand is connected in the entry of emergency drain valve 3, another strand is connected in the entry of one-level steam trap 4, the export of emergency drain valve 3 is connected in the first entry of hydrophobic receiver 8, the export of one-level steam trap 4 is connected in the entry of second grade steam trap 5, the first export of second grade steam trap 5 is connected in the second entry of hydrophobic receiver 8, the export of second grade steam trap 5 is connected in the entry of governing valve 6, the export of governing valve 6 is connected in the entry of low-pressure steam container 9.
Wherein, be equipped with liquid level switch in the drain bag 2, when the liquid level in the drain bag 2 exceeds the setting value, liquid level switch action, chain open emergency drain valve 3, when the liquid level in the drain bag 2 does not exceed the setting value, chain close emergency drain valve 3.
The utility model adopts a two-stage series steam trap, the drainage of the first-stage steam trap 4 enters the second-stage steam trap 5. When the first-stage steam trap 4 drains water, the second-stage steam trap 5 is closed; the water in the one-level steam trap 4 is discharged into the second-level steam trap 5 and then is subjected to capacity expansion, pressure reduction and temperature reduction to generate hydrophobic steam and steam, the pressure in the second-level steam trap 5 can be adjusted by the adjusting valve 6 of the second-level steam trap 5 to enable the differential pressure between the second-level steam trap 5 and the first-level steam trap 4 to be smaller, and when the water in the first-level steam trap 4 is prevented from being discharged, the water in the steam trap is vaporized, and the water is discharged more. After the steam in the second-stage steam trap 5 is discharged, the internal pressure and the temperature of the steam are reduced, the pressure difference between the steam and the pipeline at the rear part of the steam trap is reduced, when the second-stage steam trap 5 discharges water, the water in the second-stage steam trap 5 cannot be vaporized suddenly, and the drainage of the steam trap is smooth.
The utility model provides a pair of hydrophobic system of steam, the during operation, including following step:
the drainage in the high-pressure steam container 7 enters the first-stage steam trap 4 through the drainage bag 2, when the drainage in the first-stage steam trap 4 is accumulated to a certain degree, a drainage valve in the first-stage steam trap 4 is opened, the drainage is discharged into the second-stage steam trap 5, and after the drainage in the first-stage steam trap 4 is finished, the drainage valve of the first-stage steam trap 4 is closed;
the drainage in the first-stage steam trap 4 is discharged into the second-stage steam trap 5, then the volume is expanded and the pressure is reduced, water and steam with lower pressure are generated, the steam enters a low-pressure steam container 9 under the control of a regulating valve 6, and the water is automatically discharged to a drainage receiver 8 after being accumulated to a certain degree;
the pressure in the secondary steam trap 5 is controlled by adjusting the opening degree of the regulating valve 6, so that the pressure is higher than the pressure of the hydrophobic receiver 8 and higher than the pressure in the low-pressure steam container 9, the steam in the secondary steam trap 5 can enter the low-pressure steam container 9, and the water in the secondary steam trap 5 can enter the hydrophobic receiver 8;
when equipment in the steam trap module 1 breaks down and drainage is not smooth, drainage is accumulated to the drainage bag 2, a liquid level high switch is triggered, the emergency drainage valve 3 is opened, and drainage is discharged into the drainage receiver 8.
Claims (2)
1. The steam drainage system is characterized by comprising a steam trap module (1), a drainage bag (2), an emergency drainage valve (3), a high-pressure steam container (7), a drainage receiver (8) and a low-pressure steam container (9); wherein the content of the first and second substances,
the steam trap module (1) comprises a two-stage series steam trap consisting of a first-stage steam trap (4) and a second-stage steam trap (5), the second-stage steam trap (5) is provided with a regulating valve (6), and the first-stage steam trap (4) and the second-stage steam trap (5) have the functions of water and steam passing and blocking;
the export of high pressure steam container (7) is connected in the entry of drain bag (2), the export of drain bag (2) is divided into two strands, the one strand is connected in the entry of emergency drain valve (3), another strand is connected in the entry of one-level steam trap (4), the export of emergency drain valve (3) is connected in the first entry of hydrophobic receiver (8), the export of one-level steam trap (4) is connected in the entry of second grade steam trap (5), the first export of second grade steam trap (5) is connected in the second entry of hydrophobic receiver (8), second grade steam trap (5) second export is connected in the entry of governing valve (6), the export of governing valve (6) is connected in the entry of low pressure steam container (9).
2. A steam trap system according to claim 1 wherein the trap (2) incorporates a level switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021538653.2U CN212408282U (en) | 2020-07-29 | 2020-07-29 | Steam drainage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021538653.2U CN212408282U (en) | 2020-07-29 | 2020-07-29 | Steam drainage system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212408282U true CN212408282U (en) | 2021-01-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021538653.2U Active CN212408282U (en) | 2020-07-29 | 2020-07-29 | Steam drainage system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212408282U (en) |
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2020
- 2020-07-29 CN CN202021538653.2U patent/CN212408282U/en active Active
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