CN113250770A - Thermal power generating unit non-external steam source starting system and method - Google Patents
Thermal power generating unit non-external steam source starting system and method Download PDFInfo
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- CN113250770A CN113250770A CN202110732006.8A CN202110732006A CN113250770A CN 113250770 A CN113250770 A CN 113250770A CN 202110732006 A CN202110732006 A CN 202110732006A CN 113250770 A CN113250770 A CN 113250770A
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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
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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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
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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Abstract
The invention discloses a starting system and a starting method for a thermal power generating unit without an external steam source. The starting system without the external steam source for the thermal power generating unit can realize starting without other units or starting boilers and other external steam, and is simple, stable and reliable to operate.
Description
Technical Field
The invention relates to the technical field of thermal power generation, in particular to a starting system of a thermal power generating unit without an external steam source. The invention also relates to a starting method of the thermal power generating unit without an external steam source.
Background
When the power plant is built and put into operation, a starting boiler is arranged to provide auxiliary steam for the unit starting so as to ensure the safe starting of the unit.
When the starting boiler is started in a cold state of the unit, the main function is to connect an auxiliary steam system to provide steam for shaft seal, deaerator, coal mill, feed pump, air preheater soot blowing and the like. Along with the smooth operation of putting into production and many units of power plant, can be as the reserve vapour source when starting each other between the unit, start the boiler and will operate seldom, the daily maintenance starts the boiler and can bring huge manpower and material resources input, makes manufacturing cost increase, therefore partial power plant can choose to shut down the operation and start the boiler. In addition, due to environmental policy changes, many start-up boilers are forced to shut down because they do not meet environmental requirements. After the boiler is started and stopped, if the plant unit is restarted after being stopped completely or after the single-machine operation accident is tripped, the problem that external auxiliary steam cannot be provided for normal starting of the system of the thermal power generating unit due to no starting steam source can be solved.
The current starting mode of the thermal power generating unit without an external steam source mainly comprises the following steps:
when the unit is started in a cold state, the steam turbine firstly establishes partial vacuum, after the ignition of the boiler is completed, the steam is generated by the boiler, and cold reheat steam is introduced into the auxiliary steam header as an auxiliary steam source during the starting by opening the high-pressure bypass valve and closing the low-pressure bypass valve. When the temperature of the steam of the high-pressure bypass is overhigh, a bypass valve of the high-pressure bypass is closed to lock the high-pressure bypass; when the temperature of the high-pressure bypass steam is too low, the parameters of the cold reheat steam need to be coordinately controlled by adjusting the bypass valves of the high-pressure bypass and the low-pressure bypass simultaneously, so that the cold reheat steam meets the requirements of the auxiliary header.
When the unit is started in a hot state or an extremely hot state, redundant steam is arranged in the superheater and the main steam pipeline in the boiler, the partial redundant steam is used as an auxiliary steam source to be introduced into the auxiliary steam header when the unit is started by controlling the opening degrees of the high-pressure bypass and the low-pressure bypass, the heat preservation and the pressure maintaining of the boiler are required to be noticed besides the regulation speed of the high-pressure bypass valve and the low-pressure bypass valve, and the phenomenon that the auxiliary steam source is interrupted due to the fact that the boiler is too fast in heat storage consumption is avoided.
In both starting processes, the bypass valves of the high-pressure bypass and the low-pressure bypass are required to mutually coordinate to control cold re-steam parameters to serve as a steam source of the auxiliary steam header, so that the operation is complex, the control is difficult and certain risks exist; and part of power plants only have one-stage starting bypass, and the cold reheat steam can not be introduced into the auxiliary steam header to be used as an auxiliary steam source during starting in a mode of controlling by a high-pressure bypass valve and a low-pressure bypass valve.
Therefore, how to ensure the stable start of the unit under the condition of no external steam source becomes a technical problem to be solved by the technical personnel in the field.
Disclosure of Invention
The invention aims to provide a starting system of a thermal power generating unit without an external steam source, which can realize starting without other units or external steam such as a starting boiler and the like, and is simple, stable and reliable to operate. The invention also aims to provide a starting method of the thermal power generating unit without an external steam source.
In order to achieve the purpose, the invention provides a starting system without an external steam source for a thermal power generating unit, which comprises a steam turbine, a main steam pipeline, a high-pressure bypass pipeline, an auxiliary steam header pipeline and a starting steam pipeline, wherein the main steam pipeline is connected with a high-pressure cylinder of the steam turbine and the high-pressure bypass pipeline, the starting steam pipeline is connected with the high-pressure bypass pipeline and the auxiliary steam header pipeline, and the starting steam pipeline is provided with a first valve group and a first temperature and pressure reducing device.
Optionally, the steam outlet of the high pressure cylinder is provided with a cold reheat steam pipeline, the cold reheat steam pipeline is provided with a stop valve, and the auxiliary steam header pipeline is connected behind the stop valve of the cold reheat steam pipeline.
Optionally, the high pressure bypass conduit is provided with a high pressure bypass valve and a second desuperheater, the start-up steam conduit being connected before the second desuperheater.
Optionally, the high pressure bypass conduit is provided with a high pressure bypass valve and a second desuperheater, the start-up steam conduit being connected after the second desuperheater.
Optionally, a first pressure detection mechanism and a first temperature detection mechanism are arranged in the starting steam pipeline before the first temperature and pressure reducer.
Optionally, a second pressure detection mechanism and a second temperature detection mechanism are arranged in the starting steam pipeline behind the first temperature and pressure reducing device.
Optionally, the steam turbine further comprises a hot reheat steam pipeline and a low pressure bypass pipeline connected with the hot reheat steam pipeline, wherein the hot reheat steam pipeline is connected with a steam inlet of an intermediate pressure cylinder of the steam turbine.
Optionally, the low pressure bypass conduit is provided with a low pressure bypass valve and a third de-superheater, the low pressure bypass conduit being connected to the condenser.
The invention also provides a starting method of the thermal power generating unit without the external steam source, which is applied to the starting system of the thermal power generating unit without the external steam source and comprises the following steps:
communicating a high-pressure bypass pipeline of a steam turbine with an auxiliary steam header pipeline through a starting steam pipeline, wherein the starting steam pipeline is provided with a first valve group and a first temperature and pressure reducing device;
opening the first valve group and starting the first temperature and pressure reducer to adjust steam inlet parameters of the auxiliary steam header pipeline;
and when the parameters of the cold reheat steam discharged by the high-pressure cylinder are stable, closing the first valve group and opening a stop valve of a cold reheat steam pipeline arranged at a steam discharge port of the high-pressure cylinder.
Compared with the background technology, the starting system without the external steam source for the thermal power generating unit provided by the invention has the advantages that in the starting process of the thermal power generating unit, before main steam does not reach the turbine run parameter, the main steam is cooled and depressurized by means of the high-pressure bypass pipeline and then is discharged to the condenser; the steam turbine needs to be vacuumized and sealed by steam before being started, the starting system provided by the invention uses the main steam which is sent to the bypass pipeline by the main steam pipeline and does not accord with the impulse parameter as the auxiliary steam header for steam supply by the starting steam pipeline, and the main steam parameter is adjusted by using the first valve group and the first temperature and pressure reducing device of the starting steam pipeline, so that the steam using requirements of shaft sealing, purging and the like are met, and the steam is conveyed to the auxiliary steam header by the auxiliary steam header pipeline. When the unit is flushed and runs stably, the steam pipeline and the high-pressure bypass pipeline can be started in a shielding mode, and the steam exhausted by the high-pressure cylinder or the medium-pressure cylinder of the steam turbine is used as a steam source of the auxiliary steam header.
The starting system and the starting method for the thermal power generating unit without the external steam source solve the problem that the starting system only with the primary bypass cannot realize starting without the external steam source, and the starting steam pipeline after modification is provided with the independent first temperature and pressure reducer and the first valve bank, so that the parameters of auxiliary steam can be controlled more conveniently, and the modification investment is smaller; after the two-stage bypass system is transformed, the starting steam pipeline is provided with the independent first temperature and pressure reducer and the first valve bank, so that auxiliary steam parameters can be conveniently controlled, and the control difficulty is reduced; the improved system can be put into feed water for heating in advance, the temperature rise rate and the thermal stress of the heating surface of the boiler are reduced, and the falling of oxide skin on the heating surface of the boiler can be effectively inhibited; the auxiliary steam for starting the steam pipeline can also raise the water supply temperature, shorten the starting time, reduce the fuel consumption during starting and have good economical efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of a thermal power generating unit starting system without an external steam source and provided with a primary bypass;
FIG. 2 is a schematic diagram of a thermal power generating unit without an external steam source starting system with a secondary bypass provided by the invention;
fig. 3 is a flowchart of a thermal power generating unit starting method without an external steam source provided by the present invention.
Wherein:
1-a main steam pipeline, 2-a high pressure cylinder, 3-a high pressure bypass pipeline, 4-a starting steam pipeline, 5-a cold reheat steam pipeline, 6-an auxiliary steam header pipeline, 7-a middle pressure cylinder, 8-a low pressure cylinder, 9-a hot reheat steam pipeline and 10-a low pressure bypass pipeline;
11-a main valve, 12-an adjusting valve, 31-a high-pressure bypass valve, 32-a second temperature and pressure reducer, 41-a first valve group, 42-a first temperature and pressure reducer, 51-a stop valve, 61-an auxiliary steam adjusting valve group, 101-a low-pressure bypass valve and 102-a third temperature and pressure reducer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 3, fig. 1 is a schematic diagram of a thermal power generating unit no-external-steam-source starting system with a primary bypass, fig. 2 is a schematic diagram of a thermal power generating unit no-external-steam-source starting system with a secondary bypass, and fig. 3 is a flowchart of a thermal power generating unit no-external-steam-source starting method.
The starting system without external origin of the thermal power generating unit comprises a steam turbine, a main steam pipeline 1, a high-pressure bypass pipeline 3, an auxiliary steam header pipeline 6 and a starting steam pipeline 4, wherein the starting steam pipeline 4 is connected with the high-pressure bypass pipeline 3 and the auxiliary steam header pipeline 6, and the starting steam pipeline 4 is provided with a first valve group 41 and a first temperature and pressure reducing device 42. The main steam generated by the boiler is heated by the heat exchanger and then is transmitted to the steam turbine through the main steam pipeline 1 to be used as a steam source for starting and running the steam turbine. Before the main steam does not reach the turbine running parameter, the high-pressure bypass pipeline 3 is used for reducing the temperature and the pressure of the main steam and then discharging the main steam to a condenser or a reheater; before the steam turbine is started, vacuumizing and shaft sealing by steam are needed, the starting system provided by the invention uses the main steam which is sent to the bypass pipeline by the main steam pipeline 1 by the starting steam pipeline 4 and does not accord with the impulse parameter as an auxiliary steam header for steam supply, and the main steam parameter is adjusted by using the first valve group 41 and the first temperature and pressure reducing device 42 of the starting steam pipeline 4, so that the steam using requirements of shaft sealing, purging and the like are met, and the steam is conveyed to the auxiliary steam header by the auxiliary steam header pipeline 6. When the unit is complete in flushing and stable in operation, the steam pipeline 4 and the high-pressure bypass pipeline 3 can be started in a shielding mode, and steam exhausted by the high-pressure cylinder 2 or the medium-pressure cylinder 7 of the steam turbine is used as a steam source of the auxiliary steam header.
In the starting process, the requirement on the auxiliary steam parameter of the auxiliary steam header can be met only by regulating the opening/closing of the first valve group 41 and the first temperature-reducing pressurizer to regulate the temperature reduction and pressure reduction of the main steam transmitted to the high-pressure bypass pipeline 3, the regulation is convenient, stable and reliable, and steam supply by starting a boiler and steam supply by other units are not needed.
In an alternative embodiment provided by the present invention, a unit starting system including a primary bypass is taken as an example to explain the working principle of the unit starting system, and is specifically shown in fig. 1. The main steam pipeline 1 is connected with a steam inlet of the high pressure cylinder 2, and a main steam valve 11 and an adjusting steam valve 12 are arranged at the steam inlet and are used for adjusting the steam inlet of the high pressure cylinder 2. The high-pressure bypass pipeline 3 is connected in front of a main steam valve 11 of the main steam pipeline 1, before main steam parameters do not meet turbine run-out parameters, the main steam valve 11 and an adjusting steam valve 12 are closed, and main steam does not enter the high-pressure cylinder 2 but is directly discharged into a condenser after being cooled and depressurized through the high-pressure bypass pipeline 3. This application will start steam pipe 4 and connect and assist vapour header pipe way 6 through drawing forth a start steam pipe 4 at high pressure bypass pipeline 3, set up first valves 41 and first pressure reducer 42 at start steam pipe 4 simultaneously to carry to assisting the vapour header through assisting vapour header pipe way 6 after will unsatisfied the main steam cooling step-down that dashes to change the parameter, as dashing to change preceding bearing seal and sweep the vapour source of the supplementary vapour of waiting.
The steam outlet of the high pressure cylinder 2 is connected with a cold reheating steam pipeline 5, the cold reheating steam pipeline 5 is used for conveying the exhausted steam of the high pressure cylinder 2 to a boiler reheater for heating, and the other steam inlet of the auxiliary steam header pipeline 6 is connected behind a stop valve 51 of the cold reheating steam pipeline 5. The auxiliary steam header pipeline 6 is provided with an auxiliary steam regulating valve group 61 for regulating the steam supply of the cold reheating steam pipeline 5 to the auxiliary steam header pipeline 6. After the steam turbine finishes impact rotation and is stably operated in a grid-connected mode with load, steam parameters of the cold reheating steam pipeline 5 are stable, the steam pipeline 4 and the high-pressure bypass pipeline 3 can be shielded and started, the auxiliary steam regulating valve group 61 is opened, and partial steam of the cold reheating steam pipeline 5 is used for supplying steam to the auxiliary steam header pipeline 6.
The high-pressure bypass pipeline 3 is provided with a high-pressure bypass valve 31 and a second temperature and pressure reducing device 32 so as to cool and reduce the pressure of main steam and then convey the main steam to a condenser for condensation, and cooling water of the first temperature and pressure reducing device 42 and the second temperature and pressure reducing device 32 is drained from the condenser for condensation.
Alternatively, the start-up steam line 4 may be connected before the high-pressure bypass valve 31 and the second temperature-reducing reducer 32 of the high-pressure bypass line 3, and may also be connected after the high-pressure bypass valve 31 and the second temperature-reducing reducer 32 of the high-pressure bypass line 3.
In another embodiment provided by the present invention, a unit starting system including two-stage bypass is taken as an example to explain the working principle of the unit starting system, and is specifically shown in fig. 2. The main steam pipeline 1 is connected with a steam inlet of the high-pressure cylinder 2, a main steam valve 11 and an adjusting steam valve 12 are arranged at the steam inlet, and the high-pressure bypass pipeline 3 is connected in front of the main steam valve 11 of the main steam pipeline 1. A starting steam pipeline 4 is led out from the high-pressure bypass pipeline 3, the starting steam pipeline 4 is connected with the auxiliary steam header pipeline 6, and meanwhile, a first valve group 41 and a first temperature and pressure reducing device 42 are arranged on the starting steam pipeline 4.
The steam exhaust port of high pressure cylinder 2 is connected with cold reheat steam pipeline 5, and cold reheat steam pipeline 5 is used for carrying the high pressure cylinder 2 steam exhaust to the heating of boiler reheater, and hot reheat steam pipeline 9 is connected to the boiler reheater exit, and hot reheat steam pipeline 9 carries steam to intermediate pressure cylinder 7 steam inlet, and intermediate pressure cylinder 7 steam exhaust gets into 8 steam inlets of low pressure cylinder. The hot reheat steam pipeline 9 is also connected with a low-pressure bypass pipeline 10, and when the hot reheat steam parameters do not meet the steam inlet requirement of the intermediate pressure cylinder 7 or the flow rate of the hot reheat steam is greater than the steam inlet requirement of the intermediate pressure cylinder 7, the hot reheat steam is conveyed to a condenser for condensation through a low-pressure bypass valve 101 and a third temperature and pressure reducing device 102. The other steam inlet of the auxiliary steam header 6 is connected downstream of the stop valve 51 of the cold reheat steam line 5. The auxiliary steam header pipeline 6 is provided with an auxiliary steam regulating valve group 61 for regulating the steam supply of the cold reheating steam pipeline 5 to the auxiliary steam header pipeline 6. When the steam parameters of the cold reheating steam pipeline 5 are stable, the starting steam pipeline 4 and the high-pressure bypass pipeline 3 can be shielded, the auxiliary steam regulating valve group 61 is opened, and partial steam of the cold reheating steam pipeline 5 is used for supplying steam to the auxiliary steam header pipeline 6.
The high-pressure bypass pipeline 3 is provided with a high-pressure bypass valve 31 and a second temperature and pressure reducing device 32 so as to reduce the temperature and pressure of main steam and then convey the main steam to a condenser for condensation, cooling water of the first temperature and pressure reducing device 42 and the third temperature and pressure reducing device 102 can be condensed and drained from the condenser, and cooling water of the second temperature and pressure reducing device 32 can be supplied from main water.
In order to optimize the above embodiment, the present application further sets up the first temperature detection mechanism and the first pressure detection mechanism at the steam inlet of the first temperature and pressure reducer 42, so as to adjust the corresponding valve opening of the first temperature and pressure reducer 42 and the first valve bank 41 according to the steam inlet pressure detected by the first temperature detection mechanism, and adjust the flow rate of the condensate according to the steam inlet temperature detected by the first temperature detection mechanism.
Further, the steam outlet of the first temperature and pressure reducer 42 is further provided with a second temperature detection mechanism and a second pressure detection mechanism, so that the valve opening and the condensate flow of the first temperature and pressure reducer 42 and the first valve bank 41 are subjected to feedback adjustment according to the steam exhaust temperature and the steam exhaust pressure of the first temperature and pressure reducer 42, and the steam parameter entering the auxiliary steam header pipeline 6 is ensured to meet the steam requirement for auxiliary steam.
The invention also provides a method for starting the thermal power generating unit without an external steam source, which comprises the following specific steps as shown in fig. 3:
step S10: communicating a high-pressure bypass pipeline 3 of a steam turbine with an auxiliary steam header pipeline 6 through a starting steam pipeline 4, wherein the starting steam pipeline 4 is provided with a first valve group 41 and a first temperature and pressure reducing device 42;
step S20: starting the first valve group 41 and starting the first temperature and pressure reducer 42 to adjust steam inlet parameters of the auxiliary steam header pipeline;
step S30: when the parameters of the cold reheat steam discharged from the high pressure cylinder 2 are stabilized, the first valve group 41 is closed and the stop valve 51 of the cold reheat steam pipe 5 provided at the steam discharge port of the high pressure cylinder 2 is opened.
The core of the starting method is that the high-pressure bypass pipeline 3 is connected with the auxiliary steam header pipeline 6 through the starting steam pipeline 4, so that when no steam is discharged before the steam inlet heating cylinder rushes to rotate, namely cold reheat steam, in the initial starting stage of the unit, the main steam discharged into the high-pressure bypass pipeline 3 is used for cooling and depressurizing the main steam through the first valve bank 41 and the first temperature and pressure reducer 42, and the requirements of auxiliary steam utilization such as shaft sealing and the like are met. When the main valve 11 and the adjusting valve 12 of the high-pressure cylinder 2 are opened, the steam turbine finishes the impact rotation and operates stably, the steam discharge parameter of the high-pressure cylinder 2 is stable, the high-pressure bypass pipeline 3 and the starting steam pipeline 4 can be shielded at the moment, the cold reheating steam pipeline 5 is communicated with the auxiliary header pipeline and provides auxiliary steam, and at the moment, the cold reheating steam parameter of the unit is stable, so that the steam parameter can be adjusted conveniently to stably supply steam to the auxiliary header pipeline 6.
Preferably, when the main steam entering the starting steam pipeline 4 is cooled and depressurized, the steam inlet temperature and the steam inlet pressure of the first temperature and pressure reducer 42 may be detected, so as to adjust the valve opening degrees of the first temperature and pressure reducer 42 and the first valve group 41 according to the steam inlet pressure, and adjust the flow rate of the condensate water according to the steam inlet pressure of the first temperature and pressure reducer 42.
Further, the method also comprises the steps of detecting the steam exhaust temperature and the steam exhaust pressure of the first temperature and pressure reducing device 42, comparing the steam exhaust temperature and the steam exhaust pressure with set steam parameters required by entering an auxiliary steam header, and performing negative feedback regulation on the valve opening and the condensate flow of the first temperature and pressure reducing device 42 and the first valve group 41 according to the deviation value of the temperature and the pressure.
According to the starting system and method without the external steam source for the thermal power generating unit, the starting steam pipeline 4 is arranged, and the first pressure reducing and temperature reducing device and the first valve group 41 are installed, so that main steam introduced into the high-pressure bypass pipeline 3 is cooled and regulated in a pressure reducing mode, and the requirements of temperature, pressure and flow of auxiliary steam at the initial starting stage are met; the starting steam pipeline 4 is connected to the original cold reheating steam pipeline 5 of the system to the auxiliary steam header pipeline 6, so that steam can enter the auxiliary steam header and then supply steam for starting of the systems such as the shaft seal system, the denitration system, the air preheater soot blowing system, the water feeding pump steam turbine and the deaerator when the unit is started through the auxiliary steam header.
According to the requirements of different bypass systems or the consumption of the starting steam, the connecting positions of the starting steam pipeline 4 and the original bypass of the unit can be different. In addition, according to the actual demand of the starting steam consumption, the starting steam pipeline 4 can select different pipe diameters so as to achieve the balance of economy and practicability.
It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
The thermal power generating unit starting system and the method without the external steam source provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. The utility model provides a thermal power generating unit does not have external vapour source starting system, its characterized in that, includes steam turbine, main steam pipeline, high pressure bypass pipeline, assists vapour header pipe way and start steam pipeline, main steam pipeline connects the high pressure jar of steam turbine with high pressure bypass pipeline, start steam pipeline connection high pressure bypass pipeline with assist vapour header pipe way, start steam pipeline is equipped with first valves and first pressure reducer that reduces the temperature.
2. The thermal power generating unit no-external-steam-source starting system as claimed in claim 1, wherein a steam outlet of the high-pressure cylinder is provided with a cold reheat steam pipeline, the cold reheat steam pipeline is provided with a stop valve, and the auxiliary steam header pipeline is connected behind the stop valve of the cold reheat steam pipeline.
3. The thermal power generating unit external steam source-free starting system as claimed in claim 1, wherein the high-pressure bypass pipeline is provided with a high-pressure bypass valve and a second temperature and pressure reducing device, and the starting steam pipeline is connected in front of the second temperature and pressure reducing device.
4. The thermal power generating unit external steam source-free starting system as claimed in claim 1, wherein the high-pressure bypass pipeline is provided with a high-pressure bypass valve and a second temperature and pressure reducing device, and the starting steam pipeline is connected behind the second temperature and pressure reducing device.
5. The thermal power generating unit external steam source-free starting system according to any one of claims 1 to 4, wherein a first pressure detection mechanism and a first temperature detection mechanism are arranged in the starting steam pipeline before the first temperature and pressure reducing device.
6. The thermal power generating unit external steam source-free starting system as claimed in claim 5, wherein a second pressure detection mechanism and a second temperature detection mechanism are arranged in the starting steam pipeline after the first temperature and pressure reducing device.
7. The thermal power generating unit non-extraneous steam source starting system as recited in claim 6, further comprising a hot reheat steam pipeline and a low pressure bypass pipeline connected to the hot reheat steam pipeline, the hot reheat steam pipeline being connected to a steam inlet of an intermediate pressure cylinder of the steam turbine.
8. The thermal power generating unit external steam source-free starting system as claimed in claim 6, wherein the low-pressure bypass pipeline is provided with a low-pressure bypass valve and a third temperature and pressure reducing device, and the low-pressure bypass pipeline is connected to a condenser.
9. A starting method of a thermal power generating unit without an external steam source is characterized by comprising the following steps:
communicating a high-pressure bypass pipeline of a steam turbine with an auxiliary steam header pipeline through a starting steam pipeline, wherein the starting steam pipeline is provided with a first valve group and a first temperature and pressure reducing device;
opening the first valve group and starting the first temperature and pressure reducer to adjust steam inlet parameters of the auxiliary steam header pipeline;
and when the parameters of the cold reheat steam discharged by the high-pressure cylinder are stable, closing the first valve group and opening a stop valve of a cold reheat steam pipeline arranged at a steam discharge port of the high-pressure cylinder.
10. The thermal power generating unit external steam source-free starting method as claimed in claim 9, wherein the step of opening the first valve group and starting the first temperature and pressure reducer to adjust steam admission parameters of the auxiliary steam header pipeline comprises the steps of:
acquiring the steam inlet temperature and the steam inlet pressure of the first temperature and pressure reducing device, adjusting the opening degree of the first valve group according to the steam inlet pressure, and adjusting the cooling water flow of the first temperature and pressure reducing device according to the steam inlet temperature and the steam inlet pressure;
and/or acquiring the steam exhaust temperature and the steam exhaust pressure of the first temperature and pressure reducing device, correcting the opening degree of the first valve group according to the steam exhaust pressure, and adjusting the cooling water flow of the first temperature and pressure reducing device according to the steam exhaust temperature and the steam exhaust pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110732006.8A CN113250770A (en) | 2021-06-29 | 2021-06-29 | Thermal power generating unit non-external steam source starting system and method |
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| CN202110732006.8A CN113250770A (en) | 2021-06-29 | 2021-06-29 | Thermal power generating unit non-external steam source starting system and method |
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| CN113250770A true CN113250770A (en) | 2021-08-13 |
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| CN202110732006.8A Pending CN113250770A (en) | 2021-06-29 | 2021-06-29 | Thermal power generating unit non-external steam source starting system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113819451A (en) * | 2021-10-15 | 2021-12-21 | 华能(浙江)能源开发有限公司长兴分公司 | System and method for coupling solid thermal storage and steam supply of coal-fired thermal power generating unit |
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2021
- 2021-06-29 CN CN202110732006.8A patent/CN113250770A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113819451A (en) * | 2021-10-15 | 2021-12-21 | 华能(浙江)能源开发有限公司长兴分公司 | System and method for coupling solid thermal storage and steam supply of coal-fired thermal power generating unit |
| CN113819451B (en) * | 2021-10-15 | 2023-05-30 | 华能(浙江)能源开发有限公司长兴分公司 | System and method for coupling solid thermal storage and steam supply of coal-fired thermal power unit |
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