CN216788504U - Extraction steam turbine heat recovery system based on extraction steam with low parameter - Google Patents
Extraction steam turbine heat recovery system based on extraction steam with low parameter Download PDFInfo
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- CN216788504U CN216788504U CN202123400181.1U CN202123400181U CN216788504U CN 216788504 U CN216788504 U CN 216788504U CN 202123400181 U CN202123400181 U CN 202123400181U CN 216788504 U CN216788504 U CN 216788504U
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Abstract
The utility model provides an extraction steam turbine regenerative system based on low-parameter extraction steam, which can ensure the feed water temperature of a boiler during the overhaul, the shutdown or the fault treatment of a steam turbine set. One end of the main steam pipeline is connected with a steam outlet of the boiler, and the other end of the main steam pipeline is connected with a steam inlet of the extraction steam turbine; the adjusting steam extraction port of the steam extraction type steam turbine is connected with an external steam supply main pipe; the water outlet of the second high-pressure heater is connected with the water inlet of the first high-pressure heater, and the water outlet of the first high-pressure heater is connected with the water inlet of the boiler; a steam inlet of the first high-pressure heater is connected with an unregulated steam extraction port and a standby steam source steam main pipe; a steam inlet of the second high-pressure heater is connected with an external steam supply main pipe; the steam inlet of the external steam supply temperature and pressure reducer is connected with a main steam pipeline, and the steam outlet is connected with an external steam supply main pipe; the high-pressure driving steam inlet of the jet heat pump is connected with a main steam pipeline, the low-pressure steam inlet is connected with an external steam supply main pipe, and the steam outlet is connected with a standby steam source main pipe.
Description
Technical Field
The utility model relates to an extraction steam turbine regenerative system based on extraction steam with low parameter.
Background
At present, the heat recovery systems are arranged on the units of the thermal power plant to improve the economical efficiency of the units, and steam is pumped by a steam turbine to supply steam to a heat recovery heater to heat boiler feed water, so that the feed water temperature is improved, and the heat economical efficiency of the units is improved. However, during the period of the steam turbine set maintenance, shutdown or fault treatment, the high-pressure heater has no heating steam source, the boiler feed water directly enters the boiler without being heated, the temperature of the boiler feed water is greatly reduced, and the reduction of the feed water temperature means the reduction of the water temperature at the inlet of the boiler economizer and the reduction of the smoke temperature at the outlet of the economizer, so the following adverse consequences can be caused: 1. the temperature of the exhaust gas of the boiler drops, and the devices at the tail of the boiler, such as: low temperature corrosion of air preheaters and the like occurs. 2. Because economizer export smoke temperature is denitration entry smoke temperature promptly, denitration entry smoke temperature reduces and can make denitration inefficiency, and serious person can lead to the denitration to withdraw from, then pollutes the atmosphere.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art, and provides an extraction steam turbine heat recovery system based on extraction steam with low parameter, which can ensure the feed water temperature of a boiler during the overhaul, shutdown or fault treatment of a steam turbine set.
The technical scheme adopted by the utility model for solving the problems is as follows: a steam extraction type steam turbine heat recovery system based on low-parameter steam extraction comprises a boiler, a steam extraction type steam turbine, an external steam supply temperature and pressure reducer, a first high-pressure heater, a second high-pressure heater, an external steam supply main pipe and a main steam pipeline; one end of the main steam pipeline is connected with a steam outlet of the boiler, and the other end of the main steam pipeline is connected with a steam inlet of the steam extraction type steam turbine; an adjusting steam extraction port of the steam extraction type steam turbine is connected with an external steam supply main pipe; the water outlet of the second high-pressure heater is connected with the water inlet of the first high-pressure heater, and the water outlet of the first high-pressure heater is connected with the water inlet of the boiler; the steam inlet of the first high-pressure heater is connected with the non-adjustable steam extraction port of the steam extraction type steam turbine; a steam inlet of the second high-pressure heater is connected with an external steam supply main pipe; the steam inlet of the external steam supply temperature and pressure reducer is connected with a main steam pipeline, and the steam outlet is connected with an external steam supply main pipe; the method is characterized in that: the system also comprises an injection heat pump and a standby steam source steam main pipe; the steam inlet of the first high-pressure heater is also connected with a standby steam source steam main pipe; the high-pressure driving steam inlet of the jet heat pump is connected with a main steam pipeline, the low-pressure steam inlet of the jet heat pump is connected with an external steam supply main pipe, and the steam outlet of the jet heat pump is connected with a standby steam source steam main pipe.
The utility model also comprises an adjusting steam extraction pipeline, and an adjusting steam extraction port of the steam extraction type steam turbine is connected with an external steam supply main pipe through the adjusting steam extraction pipeline.
The utility model also comprises a first heating steam pipeline and a second heating steam pipeline; the steam inlet of the first high-pressure heater is respectively connected with the standby steam source steam main pipe and the non-adjustable steam extraction port of the steam extraction type steam turbine through a first heating steam pipeline, and the steam inlet of the second high-pressure heater is connected with an external supply steam main pipe through a second heating steam pipeline.
The high-pressure steam injection heat pump further comprises a high-pressure steam inlet pipeline, a low-pressure steam inlet pipeline and a first steam outlet pipeline, wherein a high-pressure driving steam inlet of the injection heat pump is connected with the main steam pipeline through the high-pressure steam inlet pipeline, a low-pressure steam inlet of the injection heat pump is connected with an external steam supply main pipe through the low-pressure steam inlet pipeline, and a steam outlet of the injection heat pump is connected with a standby steam source main pipe through the first steam outlet pipeline.
The steam supply device also comprises a steam inlet pipeline and a second steam outlet pipeline, wherein a steam inlet of the external steam supply temperature and pressure reducer is connected with the main steam pipeline through the steam inlet pipeline, and a steam outlet of the external steam supply temperature and pressure reducer is connected with the external steam supply main pipe through the second steam outlet pipeline.
Compared with the prior art, the utility model has the following advantages and effects:
(1) when the steam turbine does not operate, the heating steam source of the first high-pressure heater is ensured by arranging the jet heat pump, so that the water supply temperature of the boiler is further ensured, the smoke exhaust temperature of the boiler is not reduced, and the safe, stable and economic operation of boiler equipment is ensured;
(2) the steam extraction type steam turbine has low-parameter adjustment steam extraction, and is supplied to a first-level high-pressure heater by mixing with high-parameter main steam in an injection heat pump.
Drawings
Fig. 1 is a schematic structural diagram of the prior art.
Fig. 2 is a schematic structural diagram according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
The embodiment of the utility model comprises a boiler 1, an extraction steam turbine 2, an external steam supply temperature and pressure reducer 3, a first high-pressure heater 4, a second high-pressure heater 5, an injection heat pump 6, an external steam supply main pipe 105, a standby steam source main pipe 111 and a main steam pipeline 101.
One end of the main steam pipeline 101 is connected to a steam outlet of the boiler 1, and the other end is connected to a steam inlet of the extraction steam turbine 2.
The adjustable extraction 12 of the extraction turbine 2 is connected to an external steam supply header 105 via an adjustable extraction line 103.
The water outlet of the second high-pressure heater 5 is connected with the water inlet of the first high-pressure heater 4, and the water outlet of the first high-pressure heater 4 is connected with the water inlet of the boiler 1, so that two-stage heating is realized.
The steam inlet of the first high-pressure heater 4 is respectively connected with a standby steam source steam main pipe 111 and an unregulated steam extraction pipeline 102 connected from an unregulated steam extraction port 11 of the steam extraction turbine 2 through a first heating steam pipeline 112; the steam inlet of the second high-pressure heater 5 is connected with an external steam supply main pipe 105 through a second heating steam pipeline 104.
The steam inlet of the external supply steam temperature and pressure reducer 3 is connected with a main steam pipeline 101 through a steam inlet pipeline 106, and the steam outlet of the external supply steam temperature and pressure reducer 3 is connected with an external supply steam main pipe 105 through a second steam outlet pipeline 107.
The high-pressure driving steam inlet of the jet heat pump 6 is connected with a main steam pipeline 101 through a high-pressure steam inlet pipeline 108, the low-pressure steam inlet of the jet heat pump 6 is connected with an external steam supply main pipe 105 through a low-pressure steam inlet pipeline 109, and the steam outlet of the jet heat pump 6 is connected with a standby steam source main pipe 111 through a first steam outlet pipeline 110.
For thermal power plants with an external industrial steam supply, it is customary to provide the extraction steam turbine 2, i.e. the steam turbine has at least one adjustable extraction opening 12. And in order to ensure the reliability of the externally supplied industrial steam, the thermal power plant is provided with an externally supplied steam temperature and pressure reducer 3. The external steam supply main pipe 105 can be connected to the high-pressure heater with the corresponding parameter grade, and the heating steam of other high-pressure heaters is connected out from the non-regulated steam extraction port 11 of the steam extraction turbine 2. The above is the configuration of the regenerative system of the conventional extraction steam turbine, and can be seen in fig. 1.
When the extraction steam turbine 2 does not operate due to maintenance or failure, the temperature and pressure reducer 3 for externally supplied industrial steam is opened in a power plant for ensuring the reliability of the externally supplied industrial steam, and the externally supplied steam main pipe 105 always has steam, so that the second high-pressure heater 5 for heating the steam from the externally supplied steam main pipe 105 can still operate to heat boiler feed water when the steam turbine does not operate, and the second high-pressure heater 5 can still operate to heat boiler feed water. And the first high-pressure heater 4 for heating steam from the non-regulated steam extraction port 11 of the steam extraction turbine 2 cannot be put into operation when the turbine is not in operation, so that the boiler feed water cannot be heated.
The decrease of the boiler feed water temperature means the decrease of the water temperature at the inlet of the boiler economizer and the decrease of the smoke temperature at the outlet of the economizer. Therefore, the low-temperature corrosion and denitration efficiency of the tail equipment of the boiler are reduced, a serious person can cause denitration to exit, the emission index of a power plant exceeds the standard, the fine money of an environment-friendly part or the shutdown of the boiler in the whole plant is required, the production requirement of downstream hot users is influenced, and the economic loss is caused.
According to the thermal power plant provided by the embodiment of the utility model, by configuring the injection heat pump 6, when the extraction steam turbine 2 does not operate, so that the non-regulated extraction steam cannot provide the heating steam of the first high-pressure heater 4, the high-pressure steam inlet pipeline 108 is connected from the main steam pipeline 101, the low-pressure steam inlet pipeline 109 is connected from the external steam supply main pipe 105, the high-pressure driving steam of the high-pressure steam inlet pipeline 108 is used for injecting the low-pressure steam of the extraction steam turbine 2 through the high-speed nozzle by the injection heat pump 6, and the first steam outlet pipeline 110 is connected to the steam outlet of the injection heat pump 6 and is connected to the standby steam source main pipe 111 through mixing and diffusion, so that the heating steam required by the first high-pressure heater 4 is supplied. The temperature of the water supply from the outlet of the whole regenerative system to the boiler is ensured, and then the safe, stable and economic operation of boiler equipment is ensured. And compared with the temperature and temperature reduction device with corresponding parameters, the jet heat pump 6 applies the gas jet principle, does not need to be provided with a pressure and temperature reduction device, and has small equipment investment.
In the embodiment of the present invention, both the unregulated steam extraction pipeline 102 and the regulated steam extraction pipeline 103 of the steam extraction turbine 2 are provided with a shutoff valve, a quick-closing valve and a check valve, and the valves are configured conventionally, and in consideration of brevity of the text, further description is omitted here.
The embodiment of the utility model can also be applied to a back pressure steam turbine, and the adjusting steam extraction port is the steam exhaust port of the back pressure steam turbine.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an illustration of the structure of the present invention. Equivalent or simple changes in the structure, characteristics and principles of the utility model are included in the protection scope of the patent.
Claims (5)
1. A steam extraction type steam turbine heat recovery system based on low-parameter steam extraction comprises a boiler, a steam extraction type steam turbine, an external steam supply temperature and pressure reducer, a first high-pressure heater, a second high-pressure heater, an external steam supply main pipe and a main steam pipeline; one end of the main steam pipeline is connected with a steam outlet of the boiler, and the other end of the main steam pipeline is connected with a steam inlet of the steam extraction type steam turbine; an adjusting steam extraction port of the steam extraction type steam turbine is connected with an external steam supply main pipe; the water outlet of the second high-pressure heater is connected with the water inlet of the first high-pressure heater, and the water outlet of the first high-pressure heater is connected with the water inlet of the boiler; the steam inlet of the first high-pressure heater is connected with the non-adjustable steam extraction port of the steam extraction type steam turbine; a steam inlet of the second high-pressure heater is connected with an external steam supply main pipe; the steam inlet of the external steam supply temperature and pressure reducer is connected with a main steam pipeline, and the steam outlet is connected with an external steam supply main pipe; the method is characterized in that: the system also comprises an injection heat pump and a standby steam source steam main pipe; the steam inlet of the first high-pressure heater is also connected with a standby steam source steam main pipe; the high-pressure driving steam inlet of the jet heat pump is connected with a main steam pipeline, the low-pressure steam inlet of the jet heat pump is connected with an external steam supply main pipe, and the steam outlet of the jet heat pump is connected with a standby steam source steam main pipe.
2. The extraction turbine recuperator system having low parameter extraction as in claim 1, wherein: the steam extraction adjusting device is characterized by further comprising an adjusting steam extraction pipeline, and an adjusting steam extraction opening of the steam extraction type steam turbine is connected with an external steam supply main pipe through the adjusting steam extraction pipeline.
3. The extraction turbine recuperator system having low parameter extraction as in claim 1, wherein: the heating device also comprises a first heating steam pipeline and a second heating steam pipeline; the steam inlet of the first high-pressure heater is respectively connected with the standby steam source steam main pipe and the non-adjustable steam extraction port of the steam extraction type steam turbine through a first heating steam pipeline, and the steam inlet of the second high-pressure heater is connected with an external supply steam main pipe through a second heating steam pipeline.
4. The extraction turbine recuperator system having low parameter extraction as in claim 1, wherein: still include high-pressure steam inlet pipeline, low-pressure steam inlet pipeline and a steam outlet pipeline, the high pressure drive steam inlet of injection heat pump pass through high-pressure steam inlet pipe connection main steam pipeline, the low-pressure steam inlet of injection heat pump supplies the female pipe of steam through low-pressure steam inlet pipe connection outward, the steam outlet of injection heat pump passes through the female pipe of a steam outlet pipe connection spare steam source steam.
5. The extraction turbine recuperator system having low parameter extraction as in claim 1, wherein: still include steam inlet pipeline and No. two steam outlet pipeline, the steam inlet of outer confession steam temperature reduction pressure reducer pass through steam inlet pipe connection main steam pipeline, the steam outlet of outer confession steam temperature reduction pressure reducer passes through the female pipe of No. two steam outlet pipe connections outer confession steam.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123400181.1U CN216788504U (en) | 2021-12-31 | 2021-12-31 | Extraction steam turbine heat recovery system based on extraction steam with low parameter |
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| CN202123400181.1U CN216788504U (en) | 2021-12-31 | 2021-12-31 | Extraction steam turbine heat recovery system based on extraction steam with low parameter |
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| CN202123400181.1U Active CN216788504U (en) | 2021-12-31 | 2021-12-31 | Extraction steam turbine heat recovery system based on extraction steam with low parameter |
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2021
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