CN214499186U - Thermodynamic system for FCB function of unit - Google Patents
Thermodynamic system for FCB function of unit Download PDFInfo
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- CN214499186U CN214499186U CN202120216899.6U CN202120216899U CN214499186U CN 214499186 U CN214499186 U CN 214499186U CN 202120216899 U CN202120216899 U CN 202120216899U CN 214499186 U CN214499186 U CN 214499186U
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Abstract
The utility model relates to the technical field of generating sets, and discloses a thermodynamic system for the FCB function of a generating set, which comprises a main steam channel, a water feeding pump turbine and a hybrid heater, wherein the main steam channel is communicated with the steam inlets of the water feeding pump turbine and the hybrid heater, and the main steam channel is used for being communicated with external steam equipment; the steam distribution box is communicated with the water feed pump steam turbine and the hybrid heater respectively, and a heating steam channel is further arranged on the hybrid heater and is used for being communicated with peripheral steam equipment. The steam distribution box is used for replacing the auxiliary steam header, so that the steam with higher temperature and higher pressure can be borne, and the temperature of the steam entering the hybrid heater is improved; the deaerator is replaced by the hybrid heater, high-temperature steam is introduced into the hybrid heater by an external steam device, and the steam in the steam distribution box is heated by the high-temperature steam in the heating steam channel after entering the hybrid heater, so that the normal work of the deaerator is ensured.
Description
Technical Field
The utility model relates to a generating set technical field especially relates to a thermodynamic system for unit FCB function.
Background
The FCB is named as Fast Cut Back, means a new technology for providing a starting power supply, means that when a unit operates above a certain load, all external power supply loads are instantly thrown away due to internal or external power grid faults and power grid disconnection, a boiler is kept to operate at the lowest load, and the automatic control function of maintaining the operation of the generator with auxiliary power is realized. With the gradual maturity of the FCB technology, the large-scale thermal power generator modified by the FCB function has the characteristics of large starting capacity, high starting speed and the like, and is used as a starting power supply under the condition of network failure, so that the power grid can be recovered to be normal in the shortest possible time. In order to ensure the realization of the FCB function, when the thermal generator set is subjected to load shedding at a rated load, a water feeding pump turbine can be continuously operated, and the water feeding temperature reaches a certain value, so that the safe operation of the thermal generator set is facilitated.
Chinese utility model patent with grant publication No. CN201715247U discloses a water-feeding pump steam turbine among thermal generator set, the steam supply system of oxygen-eliminating device, boiler reheat steam passageway and water-feeding pump steam turbine, oxygen-eliminating device and boiler reheat steam intercommunication, still include the auxiliary steam header that communicates with the cold reheat steam of boiler, the cold reheat steam passageway of boiler is connected with the steam inlet of auxiliary steam header through the first pneumatic isolation door of fast opening type and the first pneumatic steam governing valve of fast opening type, the first steam outlet of auxiliary steam header is connected with the steam inlet of water-feeding pump steam turbine through the second pneumatic isolation door of fast opening type and the second pneumatic steam governing valve of fast opening type, the second steam outlet of auxiliary steam header connects gradually the third pneumatic isolation door of fast opening type, the third pneumatic steam governing valve of fast opening type, be connected with the steam inlet of oxygen-eliminating device behind the fourth pneumatic isolation door of fast opening type.
The steam supply system of the water feed pump turbine and the deaerator in the thermal power generating unit is additionally provided with the auxiliary steam header in the gas circuit, and the auxiliary steam header is used for supplying steam to the water feed pump turbine and the deaerator to ensure the work of the deaerator and the water feed pump turbine. However, the auxiliary steam header belongs to a low-temperature low-pressure container, the gas entering the auxiliary steam header is cold reheat steam in a boiler, the temperature of the gas is low, the temperature of the water inside the deaerator is high when the deaerator works normally, and the temperature of the water is reduced after the cold reheat steam enters the deaerator, so that the normal working requirement of the deaerator cannot be met.
SUMMERY OF THE UTILITY MODEL
The utility model aims at: the utility model provides a thermodynamic system for unit FCB function to solve the problem that the cold reheat steam temperature that the auxiliary steam header got into in the oxygen-eliminating device among the prior art is lower, unsatisfied the normal work demand of oxygen-eliminating device.
In order to achieve the above object, the present invention provides a thermodynamic system for the FCB function of a unit, including a main steam channel, a water feed pump turbine, and a hybrid heater, wherein the main steam channel is communicated with the steam inlets of the water feed pump turbine and the hybrid heater, and the main steam channel is used for being communicated with an external steam device; the steam distribution box is provided with a first steam outlet and a second steam outlet, the first steam outlet is communicated with a steam inlet of the feed water pump steam turbine, the second steam outlet is communicated with a steam inlet of the hybrid heater, a heating steam channel is further arranged on the hybrid heater, and the heating steam channel is used for being communicated with peripheral steam equipment.
Preferably, a first distribution pipe communicated with the first steam outlet and a second distribution pipe communicated with the second steam outlet are arranged in the steam distribution box, and the pipe diameters of the first distribution pipe and the second distribution pipe are different.
Preferably, the first steam outlet and the second steam outlet have different calibers.
Preferably, the heating steam channel is arranged at intervals, and each heating steam channel is arranged at the bottom of the hybrid heater.
Preferably, the air inlet end of the steam distribution box is also connected with a temperature and pressure reducing device for reducing the temperature and the pressure of the steam.
Preferably, the temperature and pressure reducing device comprises a temperature reducer and a pressure reducing valve which are arranged in sequence.
Preferably, a first shut-off valve, a first regulating valve and a first one-way valve are sequentially arranged on a communication channel between the steam distribution box and the hybrid heater.
Preferably, a second check valve and a second shut-off valve are sequentially arranged on a communication channel between the steam distribution box and the feed water pump turbine.
Preferably, the first shut-off valve and the second shut-off valve are pneumatic valves.
The embodiment of the utility model provides a thermodynamic system for unit FCB function compares with prior art, and its beneficial effect lies in: the auxiliary steam header is replaced by the steam distribution box, the pressure bearing performance of the steam distribution box is higher than that of the auxiliary steam header, the steam distribution box can bear steam with higher temperature and higher pressure, and the temperature of the steam entering the hybrid heater is improved; the mixed heater is used for replacing the deaerator, a heating steam channel is arranged at the bottom of the mixed heater and communicated with an external steam device, the external steam device introduces high-temperature steam into the mixed heater, and the steam in the steam distribution box is heated by the high-temperature steam in the heating steam channel after entering the mixed heater, so that the water temperature in the mixed heater is increased, the normal work of the deaerator is ensured, the requirement of the boiler on the hot state clean water temperature is met, and the furnace heating system is saved.
Drawings
Fig. 1 is a schematic structural diagram of a thermodynamic system for the unit FCB function according to the present invention.
In the figure, 1, a main steam channel; 2. a feed pump turbine; 3. a hybrid heater; 31. a steam channel; 4. a steam distribution box; 41. a first distribution pipe; 42. a second distribution pipe; 5. a one-way valve; 6. a flow meter; 7. an electrically operated shutoff valve; 8. a first shut-off valve; 9. a first regulating valve; 10. a first check valve; 11. a second one-way valve; 12. a second shutoff valve; 13. a desuperheater; 14. a pressure reducing valve.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
The utility model discloses a preferred embodiment for thermodynamic system of unit FCB function, as shown in FIG. 1, this thermodynamic system for unit FCB function includes main steam passageway 311, feed pump steam turbine 2, hybrid heater 3, steam distribution box 4, and main steam passageway 311 passes through the pipeline with feed pump steam turbine 2, hybrid heater 3 and is connected respectively, and steam distribution box 4 passes through the pipeline with feed pump steam turbine 2, hybrid heater 3 and is connected respectively. The main steam passage 311 is used to connect with an external steam device to supply steam to the feed pump turbine 2 and the hybrid heater 3 when the generator set does not need the FCB function in normal operation.
The one-way valve 5, the flow meter 6 and the electric shutoff valve 7 are sequentially arranged on a communication channel between the main steam channel 311 and the water feed pump turbine 2, the one-way valve 5 can control steam to flow to the water feed pump turbine 2 only, the flow meter 6 can measure the flow of the steam, and the electric shutoff valve 7 is used for controlling the on-off of the communication channel. An electric shutoff valve 7 and a check valve 5 are connected in sequence to a communication passage between the main steam passage 311 and the hybrid heater 3, and the functions of the electric shutoff valve 7 and the check valve 5 are the same as those of the electric shutoff valve 7 and the check valve 5 between the main steam passage 311 and the feed pump turbine 2, and repeated description thereof is omitted.
The hybrid heater 3 is used for storing water for removing oxygen, a heating steam channel 31 is arranged on the hybrid heater 3, the heating steam channel 31 is used for being communicated with an external steam device, and the external steam device can be a steam device for conveying steam to the hybrid heater 3 when the thermal generator set works normally or an additional steam device which is arranged independently. The heating steam channel 31 conveys high-temperature steam into the hybrid heater 3 to heat water in the hybrid heater 3, so that the water temperature in the hybrid heater 3 is improved, and the normal operation of the deaerator is ensured.
The number of the steam channels 31 is two, the two steam channels 31 are arranged at the bottom of the hybrid heater 3 at intervals along the length direction of the hybrid heater 3, and the two steam channels 31 can increase the input efficiency of the steam and increase the acceleration rate of the water temperature. The steam channel 31 is arranged at the bottom of the hybrid heater 3, and the steam is fully contacted with the deoxygenated water after entering the hybrid heater 3, so that the heating efficiency is improved. In other embodiments, there may be only one steam channel 31, or there may be three, four, etc.
The steam distribution box 4 is provided with a first steam outlet and a second steam outlet which are arranged at intervals along the length direction of the steam distribution box 4, the first steam outlet is communicated with a steam inlet of the water pump steam turbine, and the second steam outlet is communicated with a steam inlet of the hybrid heater 3. When the thermal power generator starts the FCB function, the steam distribution box 4 is used to supply steam to the feed pump turbine 2 and the hybrid heater 3, and it is ensured that the feed pump turbine 2 and the hybrid heater 3 do not stop working.
A first distribution pipe 41 and a second distribution pipe 42 are arranged in the steam distribution box 4, the first distribution pipe 41 is communicated with a first steam outlet, the second distribution pipe 42 is communicated with a second steam outlet, the pipe diameters of the first distribution pipe 41 and the second distribution pipe 42 are different, and the calibers of the first steam outlet and the second steam outlet are different, the steam quantity entering the water feeding pump turbine 2 and the hybrid heater 3 is adjusted by changing the pipe diameters of the first distribution pipe 41 and the second distribution pipe 42 and the calibers of the first steam outlet and the second steam outlet, the steam is distributed according to the requirements of the water feeding pump turbine and the hybrid heater 3, and the utilization efficiency of the steam is improved.
A first shutoff valve 8, a first regulating valve 9 and a first one-way valve 10 are sequentially arranged on a communication channel of the steam distribution box 4 and the hybrid heater 3, and the first shutoff valve 8 is an air-operated valve. The first shut-off valve 8 is used for controlling the on-off of a channel between the steam distribution box 4 and the hybrid heater 3, the pneumatic valve is high in automation, and automatic operation is convenient to achieve. The first regulating valve 9 can regulate the flow rate of the steam entering the hybrid heater 3 through the steam distribution box 4, thereby keeping the pressure difference between the steam distribution box 4 and the hybrid heater 3 stable and stably reducing the pressure in the hybrid heater 3. The first check valve 10 makes the steam flow only in one direction, and prevents the steam in the hybrid heater 3 from flowing reversely to the steam distribution box 4.
And a second one-way valve 11 and a second shut-off valve 12 are sequentially arranged on a communication channel between the steam distribution box 4 and the water feeding pump turbine 2, and the second shut-off valve 12 is an air-operated valve. The second check valve 11 can ensure that the steam can only flow in one direction, and the steam in the water supply pump turbine 2 is prevented from flowing reversely to the steam distribution box 4. The second shut-off valve 12 is used for controlling the on-off of a channel between the steam distribution box 4 and the water feeding pump turbine 2, the pneumatic valve is high in automation, and automatic operation is convenient to achieve.
The inlet end of the steam distribution box 4 is further connected with a temperature and pressure reducing device for reducing the temperature and the pressure of the steam, the temperature and pressure reducing device comprises a temperature reducer 13 and a pressure reducing valve 14 which are sequentially arranged, the specific structures of the temperature reducer 13 and the pressure reducing valve 14 are the prior art, and detailed description is omitted here. The temperature reducer 13 and the pressure reducing valve 14 can reduce the temperature and the pressure of the steam entering the steam distribution box 4, so that the pressure of the steam cannot exceed the allowable pressure of the steam distribution box 4, and the service life of the steam distribution box 4 is prolonged; meanwhile, high-temperature and high-pressure gas can enter the steam distribution box 4 through the temperature and pressure reduction device, so that the source of steam is improved, and the application range of the source of steam is wider. In other embodiments, the temperature and pressure reducing device may also be a steam ejector.
To sum up, the embodiment of the present invention provides a thermodynamic system for the FCB function of a unit, which uses a steam distribution box to replace an auxiliary steam header, wherein the pressure-bearing performance of the steam distribution box is higher than that of the auxiliary steam header, so that the thermodynamic system can bear steam with higher temperature and higher pressure, and improve the temperature of the steam entering a hybrid heater; the mixed heater is used for replacing the deaerator, a heating steam channel is arranged at the bottom of the mixed heater and communicated with an external steam device, the external steam device introduces high-temperature steam into the mixed heater, and the steam in the steam distribution box is heated by the high-temperature steam in the heating steam channel after entering the mixed heater, so that the water temperature in the mixed heater is increased, the normal work of the deaerator is ensured, the requirement of the boiler on the hot state clean water temperature is met, and the furnace heating system is saved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.
Claims (9)
1. A thermodynamic system for the FCB function of a unit is characterized by comprising a main steam channel, a water feeding pump steam turbine and a hybrid heater, wherein the main steam channel is communicated with steam inlets of the water feeding pump steam turbine and the hybrid heater and is used for being communicated with peripheral steam equipment; the steam distribution box is provided with a first steam outlet and a second steam outlet, the first steam outlet is communicated with a steam inlet of the feed water pump steam turbine, the second steam outlet is communicated with a steam inlet of the hybrid heater, a heating steam channel is further arranged on the hybrid heater, and the heating steam channel is used for being communicated with peripheral steam equipment.
2. The thermodynamic system for unit FCB functionality according to claim 1, wherein a first distribution pipe communicating with the first steam outlet and a second distribution pipe communicating with the second steam outlet are arranged inside the steam distribution box, the first distribution pipe and the second distribution pipe having different pipe diameters.
3. The thermodynamic system for unit FCB functionality according to claim 1, wherein the first steam outlet and the second steam outlet have different calibers.
4. The thermodynamic system for unit FCB function according to any one of claims 1 to 3, wherein the heating steam channels are arranged in plurality at intervals, and each heating steam channel is arranged at the bottom of the hybrid heater.
5. The thermodynamic system for unit FCB function according to any one of claims 1 to 3, wherein a temperature and pressure reducing device for reducing temperature and pressure of steam is further connected to the air inlet end of the steam distribution box.
6. The thermodynamic system for unit FCB function according to claim 5, wherein the desuperheating and depressurizing device comprises a desuperheater and a depressurization valve arranged in sequence.
7. The thermodynamic system for unit FCB function according to any one of claims 1 to 3, wherein a first shut-off valve, a first regulating valve and a first check valve are arranged in sequence on the communication channel of the steam distribution box and the hybrid heater.
8. The thermodynamic system for unit FCB function according to claim 7, wherein a second check valve and a second shut-off valve are arranged in sequence on a communication channel between the steam distribution box and the feed pump turbine.
9. The thermodynamic system for unit FCB function according to claim 8, wherein the first and second shut-off valves are pneumatic valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120216899.6U CN214499186U (en) | 2021-01-26 | 2021-01-26 | Thermodynamic system for FCB function of unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120216899.6U CN214499186U (en) | 2021-01-26 | 2021-01-26 | Thermodynamic system for FCB function of unit |
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| CN214499186U true CN214499186U (en) | 2021-10-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120216899.6U Active CN214499186U (en) | 2021-01-26 | 2021-01-26 | Thermodynamic system for FCB function of unit |
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2021
- 2021-01-26 CN CN202120216899.6U patent/CN214499186U/en active Active
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