CN111735037B - High-pressure heater accident drainage system capable of recycling accident drainage heat - Google Patents
High-pressure heater accident drainage system capable of recycling accident drainage heat Download PDFInfo
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- CN111735037B CN111735037B CN202010596798.6A CN202010596798A CN111735037B CN 111735037 B CN111735037 B CN 111735037B CN 202010596798 A CN202010596798 A CN 202010596798A CN 111735037 B CN111735037 B CN 111735037B
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- heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
- F22B37/50—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers for draining or expelling water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/08—Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B11/00—Controlling arrangements with features specially adapted for condensers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention discloses an accident drainage system of a high-pressure heater capable of recovering accident drainage heat, wherein a heat exchanger is connected in series on an accident drainage pipeline of the high-pressure heater, and the accident drainage pipeline can heat condensed water by using accident drainage of the heater during the starting period of a unit, the low-load stage and the leakage of an accident drainage regulating valve, so that the effective utilization of the accident drainage heat is realized, and the operation economy of the unit during the starting period of the unit, the low-load stage and the leakage of the accident drainage regulating valve is improved; the accident drain is cooled through the heat exchanger, so that the safety problem caused by overhigh temperature of the drain flash tank due to the accident drain can be prevented; the pressure difference communication component can keep a certain pressure difference between the heat exchanger and the condenser, and ensure that the pressure in the heat exchanger is higher than the saturation pressure corresponding to the drainage temperature of the heat exchanger; the invention does not change the operation mode of the high-pressure heater, and the high-pressure heater can still adopt the existing operation mode, thereby having the advantages of good compatibility and convenient reconstruction.
Description
Technical Field
The invention relates to the technical field of electric power engineering, in particular to an accident drainage system of a high-pressure heater, which can recover accident drainage heat.
Background
The high-pressure heater heats the feed water by using the extracted steam of the steam turbine, can improve the average heat absorption temperature of the thermodynamic cycle of the unit and reduce the cold source loss of the steam turbine, and is important equipment for improving the operation economy of the modern thermal power unit. In the normal operation process of the unit, drainage of the high-pressure heater generally adopts a step-by-step self-flow operation mode. In order to ensure the operation safety of the unit, the high-pressure heater is also provided with an accident drainage pipeline, and when the high-pressure heater is put into operation or stopped, drainage of the heater is drained through the accident drainage pipeline when drainage of the heater cannot flow automatically step by step; in the normal operation process of the heater, when the water level of the high-pressure heater is high in the operation process of the unit and gives an alarm, the accident drain valve is opened to reduce the water level of the high-pressure heater, and the phenomenon that the operation safety of the steam turbine is influenced because the drain flows back to the steam turbine through the steam extraction pipeline due to the overhigh water level of the high-pressure heater is avoided.
The high-pressure heater accident drain pipeline of most units in service is connected to a condenser drain flash tank, and a regulating valve and a shut-off valve are usually designed on the accident drain pipeline. Generally, during the startup of the unit, in order to increase the temperature of the feed water, after the pressure of the cold reheat steam pipeline is raised or the temporary heating steam pipeline is adopted, a certain high-pressure heater in the middle is firstly put into use, and at the moment, the high-pressure drain of the high-pressure heater is discharged to the drain flash tank through the accident drain pipeline. At the early stage of operation of each high-pressure heater or when the load of a unit is low, because the drainage of the heater does not have the condition of gradual self-flow, the drainage of each high-pressure heater can be discharged only through an accident drainage pipeline. However, the conventional high-pressure heater accident drainage system has the following technical problems: 1. the drainage of the high-pressure heater is directly discharged into the drainage flash tank, and the heat of the drainage cannot be effectively utilized, so that the economic efficiency of the unit during starting or low-load operation is poor. 2. After the drainage of the high-pressure heater is discharged into the drainage flash tank, in order to ensure that the drainage flash tank does not exceed the temperature, a large amount of desuperheating water is required to be added to desuperheat the drainage flash tank, although the measure of running desuperheating water is adopted, the temperature of working media in the drainage flash tank is still high during starting and low load of some units, and the running safety of the drainage flash tank is seriously influenced. 3. The accident drain regulating valve of the high-pressure heater of many active units has the leakage problem, the direct leakage of drain to the drain flash tank causes the waste of drain heat, and the steam extraction amount of the heater with lower pressure is increased, thereby reducing the operation economy of the unit. If the shut-off valves in front of and behind the accident drain regulating valve of the high-pressure heater are closed in the normal operation process of the unit, when the water level of the heater is high, if the accident drain valve cannot be opened in time, a serious accident of water inlet of the steam turbine may occur.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problems in the prior art, the accident drainage system of the high-pressure heater capable of recycling the accident drainage heat is provided, the rear end of an accident drainage port of the high-pressure heater is connected with a heat exchanger in series, and the accident drainage port of the high-pressure heater can be used for heating condensed water by using the accident drainage of the heater during the starting period and the low-load stage of a unit and when the accident drainage regulating valve leaks, so that on one hand, the effective utilization of the accident drainage heat can be realized, a large amount of water reducing water of a drainage flash tank of a condenser is not required to be added, and the running economy of the unit during the starting and the low-load running of the unit and when the accident drainage regulating valve leaks is favorably improved; on the other hand, the accidental drainage of the high-pressure heater can be effectively cooled through the heat exchanger, so that the safety problem caused by overhigh temperature of the drainage flash tank due to accidental drainage of the high-pressure heater can be prevented; the pressure difference communication component is arranged on the drain pipeline of the heat exchanger, so that a certain pressure difference can be kept between the heat exchanger and the condenser, and the pressure in the heat exchanger is higher than the saturation pressure corresponding to the drain temperature; the invention does not change the operation mode of the high-pressure heater, and the high-pressure heater can still adopt the existing operation mode, thereby having the advantages of good compatibility and convenient reconstruction.
In order to solve the technical problems, the invention adopts the technical scheme that:
the high-pressure heater accident drainage system capable of recycling accident drainage heat comprises a high-pressure heater and a condenser, wherein a heat exchanger and a pressure difference communication component used for keeping pressure difference between the heat exchanger and the condenser are connected to an accident drainage pipeline between an accident drainage port of the high-pressure heater and the condenser respectively, the heat exchanger is provided with an isolated accident drainage channel and a heat exchange medium channel, and the accident drainage port of the high-pressure heater is connected with the condenser through the heat exchanger and the pressure difference communication component.
Optionally, the pressure difference communication part is a riser, and the highest point position of the riser keeps a preset height difference with the shell of the heat exchanger so as to ensure that the hydrophobic water of the heat exchanger is not vaporized.
Optionally, the heat exchange medium channel is connected in series to a condensed water pipeline behind a gland seal heater and in front of a low-pressure heater of the steam turbine to heat condensed water and reduce the steam extraction amount of the steam turbine.
Optionally, a regulating valve is arranged on a pipeline between the accident drain opening of the high-pressure heater and the heat exchanger.
Optionally, a shut-off valve is arranged on a pipeline between the accident drain port of the high-pressure heater and the heat exchanger so as to be convenient for maintenance and isolation.
Optionally, an outlet of the differential pressure communication component is divided into two branches, and the two branches are respectively connected to a steam side of the condenser and the hot well to achieve steam-water separation.
Compared with the prior art, the invention has the following advantages:
1. the rear end of the accident drain opening of the high-pressure heater is connected with the heat exchanger in series, so that the accident drain heat of the high-pressure heater can be recycled during the starting period of a unit, the low-load stage and the leakage of the accident drain regulating valve, on one hand, the accident drain heat of the high-pressure heater can be effectively utilized, and a large amount of drain flash tank desuperheating water is not required to be input, so that the operation economy of the unit during starting and low-load operation and the leakage of the accident drain regulating valve can be improved; on the other hand can effectively cool off high pressure feed water heater accident drainage through the heat exchanger to can prevent the high pressure feed water heater accident drainage and lead to the safety problem that hydrophobic flash tank high temperature causes.
2. The pressure difference communicating component is arranged on the drain pipeline of the heat exchanger, so that a certain pressure difference can be kept between the heat exchanger and the condenser, and the pressure in the heat exchanger is higher than the saturation pressure corresponding to the drain temperature.
3. The invention only arranges a maintenance shut-off valve on the drain pipe of the heat exchanger, and the shut-off valve is kept fully opened during normal operation, so as to ensure the smoothness of draining of the high-pressure heater, and the operation mode of the high-pressure heater is not changed, and the high-pressure heater can still adopt the existing operation mode, thus having the advantages of good compatibility and convenient reconstruction.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Illustration of the drawings: 1. a high pressure heater; 11. a normal drain regulating valve; 2. a condenser; 3. a heat exchanger; 31. an accident drain control valve; 4. a differential pressure communication member; 5. a deaerator; 6. and (4) a hot well.
Detailed Description
As shown in fig. 1, the present embodiment provides a high pressure heater emergency drain system capable of recovering emergency drain heat, which includes a high pressure heater 1 and a condenser 2, a heat exchanger 3 and a differential pressure communication component 4 for maintaining a differential pressure between the heat exchanger 3 and the condenser 2 are respectively connected to an emergency drain pipeline between an emergency drain port of the high pressure heater 1 and the condenser 2, the heat exchanger 3 has an isolated emergency drain channel (e.g. a channel from b to c in fig. 1) and a heat exchange medium channel (e.g. a channel from d to e in fig. 1), and the emergency drain port of the high pressure heater 1 (e.g. a channel in fig. 1) is connected to the condenser 2 through the drain channel of the heat exchanger 3 and the differential pressure communication component 4. Because the heat exchanger 3 is connected with the condenser 2, as long as the drain channel pipe diameter of the heat exchanger 3 is properly designed, the drain of all the high-pressure heaters 1 can be ensured to be discharged smoothly under emergency, and the effect of the accident drain pipeline of the high-pressure heaters 1 cannot be influenced. In the embodiment, the heat exchanger 3 is connected in series at the rear end of the accident drain opening of the high-pressure heater 1, so that the accident drain heat of the high-pressure heater can be recycled during the starting period of a unit, the low-load stage and the leakage of the accident drain regulating valve, on one hand, the accident drain heat of the high-pressure heater 1 can be effectively utilized, a large amount of drain flash tank desuperheating water is not required to be input, and the operation economy of the unit during starting and low-load operation and the leakage of the accident drain regulating valve can be improved; on the other hand, the accidental drainage of the high-pressure heater 1 can be effectively cooled through the heat exchanger 3, so that the safety problem caused by overhigh temperature of the drainage flash tank due to accidental drainage of the high-pressure heater can be prevented; the pressure difference communication component 4 is arranged on the drain pipeline of the heat exchanger in the embodiment and is used for keeping a certain pressure difference between the heat exchanger and the condenser and ensuring that the pressure in the heat exchanger 3 is higher than the saturation pressure corresponding to the drain temperature; in the embodiment, only one maintenance shut-off valve is arranged on the drain pipeline of the heat exchanger, and the shut-off valve is kept fully opened in normal operation, so that the drainage smoothness of the high-pressure heater can be ensured, the operation mode of the high-pressure heater cannot be changed, the high-pressure heater 1 can still adopt the existing operation mode, and the heat exchanger has the advantages of good compatibility and convenience in transformation.
As an alternative embodiment, as shown in fig. 1, in this embodiment, the pressure difference communication component 4 is a riser, and the highest point position of the riser and the shell of the heat exchanger 3 maintain a preset height difference H to ensure that the pressure in the heat exchanger 3 is higher than the saturation pressure corresponding to the hydrophobic temperature thereof, and ensure that the hydrophobic water of the heat exchanger 3 does not vaporize. In order to ensure that the drainage of the heat exchanger 3 can reliably flow into the condenser 2, the drainage pipeline of the heat exchanger 3 is not provided with a regulating valve, but a shut-off valve can be additionally arranged for maintenance and isolation, and the shut-off valve is kept fully opened in the normal operation process of the unit.
The heat exchanger 3 in the present embodiment is a surface heat exchanger, and other types of heat exchangers (heat exchangers) may be used as needed. As an alternative embodiment, in this embodiment, the heat exchange medium passage (e.g. the passage between d and e in fig. 1) is connected in series to the condensed water pipeline after the gland seal heater and before the low pressure heater of the steam turbine to heat the condensed water and reduce the steam extraction amount of the steam turbine, that is: the pipe side of the heat exchanger 3 is provided with condensed water interfaces d and e which are respectively connected with a condensed water inlet pipeline and a condensed water outlet pipeline of the heat exchanger, and the heat exchanger 3 is arranged on the condensed water pipeline behind the shaft seal heater and in front of the low-pressure heater, so that the condensed water in the condensed water pipeline can be heated, the steam extraction amount of the low-pressure heater is reduced, and the economical efficiency of the unit operation is improved.
As an alternative embodiment, as shown in fig. 1, in order to facilitate the adjustment of the water level of the high pressure heater and the maintenance, an emergency drain control valve and a maintenance shutoff valve are provided on a pipeline between the emergency drain port of the high pressure heater 1 and the heat exchanger 3 in this embodiment.
As an alternative embodiment, as shown in fig. 1, in the present embodiment, the number of the high pressure heaters 1 is three, and the three high pressure heaters 1 are respectively connected in cascade through a normal drain port (shown as f in fig. 1).
As shown in fig. 1, in the present embodiment, a normal drain regulating valve 11 is connected in series to the cascade connection pipeline of the plurality of high-pressure heaters 1, and the water level of each high-pressure heater 1 can be regulated by the normal drain regulating valve 11.
As shown in fig. 1, in this embodiment, the outlet of the differential pressure communication component 4 is divided into two branches, which are respectively connected to the steam side of the condenser and the hot well 6, so as to realize steam-water separation.
In conclusion, the heat exchanger 3 is connected in series on the accident drain pipeline of the high-pressure heater in the embodiment, so that the accident drain of the heater can be used for heating the condensed water during the starting period of the unit, the low-load stage and the leakage of the accident drain regulating valve, the effective utilization of the accident drain heat is realized, and the operation economy of the unit during the starting period of the unit, the low-load stage and the leakage of the accident drain regulating valve is improved; the accident drainage is cooled through the heat exchanger 3, so that the safety problem caused by overhigh temperature of the drainage flash tank due to the accident drainage can be prevented; the pressure difference communication component 4 in the embodiment can keep a certain pressure difference between the heat exchanger 3 and the condenser 2, and ensure that the pressure in the heat exchanger 3 is higher than the saturation pressure corresponding to the drainage temperature; the operation mode 1 of the high-pressure heater cannot be changed, the high-pressure heater 1 can still adopt the existing operation mode, and the high-pressure heater has the advantages of good compatibility and convenience in transformation.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (5)
1. A high-pressure heater accident drainage system capable of recycling accident drainage heat comprises a high-pressure heater (1) and a condenser (2), and is characterized in that a heat exchanger (3) and a pressure difference communication component (4) used for maintaining pressure difference between the heat exchanger (3) and the condenser (2) are connected to an accident drainage pipeline between an accident drainage port of the high-pressure heater (1) and the condenser (2) respectively, the heat exchanger (3) is provided with an isolated accident drainage channel and a heat exchange medium channel, and the accident drainage port of the high-pressure heater (1) is connected with the condenser (2) through the heat exchanger (3) and the pressure difference communication component (4); the pressure difference communication component (4) is a vertical pipe, the highest point position of the vertical pipe and the shell of the heat exchanger (3) keep a preset height difference so as to ensure that the pressure in the heat exchanger (3) is higher than the saturation pressure corresponding to the drainage temperature of the heat exchanger, and the drainage of the heat exchanger (3) is ensured not to be vaporized.
2. The high pressure heater emergency drain system capable of recovering emergency drain heat according to claim 1, wherein the heat exchange medium passage is connected in series to the condensed water pipe after the gland seal heater and before the low pressure heater of the steam turbine.
3. High pressure heater emergency drain system capable of recovering emergency drain heat according to claim 1, characterized in that the pipeline between the emergency drain port of the high pressure heater (1) and the heat exchanger (3) is provided with a regulating valve.
4. High pressure heater emergency drain system capable of recovering emergency drain heat according to claim 1, characterized in that a shut-off valve is provided on the pipe between the emergency drain of the high pressure heater (1) and the heat exchanger (3).
5. High pressure heater emergency drain system for recovery of emergency drain heat according to claim 1, characterized in that the outlet of the pressure difference communication part (4) is branched into two branches, respectively connected to the steam side of the condenser (2) and the hot well (6).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010596798.6A CN111735037B (en) | 2020-06-28 | 2020-06-28 | High-pressure heater accident drainage system capable of recycling accident drainage heat |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010596798.6A CN111735037B (en) | 2020-06-28 | 2020-06-28 | High-pressure heater accident drainage system capable of recycling accident drainage heat |
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| Publication Number | Publication Date |
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| CN111735037A CN111735037A (en) | 2020-10-02 |
| CN111735037B true CN111735037B (en) | 2022-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010596798.6A Active CN111735037B (en) | 2020-06-28 | 2020-06-28 | High-pressure heater accident drainage system capable of recycling accident drainage heat |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114370631A (en) * | 2022-01-20 | 2022-04-19 | 广东韶钢松山股份有限公司 | Condensate recovery device of high-pressure feed water heater |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08312905A (en) * | 1995-05-23 | 1996-11-26 | Toshiba Corp | Combined cycle power generating facility |
| CN103322551A (en) * | 2012-03-19 | 2013-09-25 | 李建锋 | Method for recycling energy of high pressure heater in thermal power plant |
| CN208312353U (en) * | 2018-05-08 | 2019-01-01 | 中国能源建设集团科技发展有限公司 | A kind of hydrophobic heat recovery system of power plant steam turbine |
| CN209801455U (en) * | 2018-12-18 | 2019-12-17 | 广东省韶关粤江发电有限责任公司 | Low-pressure drainage optimization structure of 600MW unit |
-
2020
- 2020-06-28 CN CN202010596798.6A patent/CN111735037B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08312905A (en) * | 1995-05-23 | 1996-11-26 | Toshiba Corp | Combined cycle power generating facility |
| CN103322551A (en) * | 2012-03-19 | 2013-09-25 | 李建锋 | Method for recycling energy of high pressure heater in thermal power plant |
| CN208312353U (en) * | 2018-05-08 | 2019-01-01 | 中国能源建设集团科技发展有限公司 | A kind of hydrophobic heat recovery system of power plant steam turbine |
| CN209801455U (en) * | 2018-12-18 | 2019-12-17 | 广东省韶关粤江发电有限责任公司 | Low-pressure drainage optimization structure of 600MW unit |
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| CN111735037A (en) | 2020-10-02 |
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