CN115234959B - A supercritical steam turbine heating system - Google Patents
A supercritical steam turbine heating systemInfo
- Publication number
- CN115234959B CN115234959B CN202211034598.7A CN202211034598A CN115234959B CN 115234959 B CN115234959 B CN 115234959B CN 202211034598 A CN202211034598 A CN 202211034598A CN 115234959 B CN115234959 B CN 115234959B
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- steam
- pipe
- main
- reheat
- heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D1/00—Steam central heating systems
- F24D1/02—Steam central heating systems operating with live steam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D1/00—Steam central heating systems
- F24D1/06—Steam central heating systems operating with superheated steam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D1/00—Steam central heating systems
- F24D1/08—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1003—Arrangement or mounting of control or safety devices for steam heating systems
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
Abstract
The invention relates to a heat supply system of a supercritical steam turbine, which comprises a boiler, a supercritical steam turbine set, a main steam heat supply pipeline, a reheat steam heat supply pipeline and a main heat supply pipe, wherein the supercritical steam turbine set comprises a high-pressure cylinder and a medium-pressure cylinder, a main steam main pipe is connected with a steam inlet of the high-pressure cylinder, a reheat steam main pipe is connected with a steam inlet of the medium-pressure cylinder, a steam outlet end of a main steam outlet pipe of the boiler is respectively communicated with a steam inlet of the main steam heat supply pipeline and a steam inlet of the main steam main pipe through a main steam three-way joint, a steam outlet end of the high-pressure cylinder is respectively communicated with a steam inlet of the boiler, a steam outlet end of a reheat steam outlet pipe of the boiler is respectively communicated with a steam inlet of the reheat steam heat supply pipeline and a steam inlet of the reheat steam main pipe through a reheat steam three-way joint, and a steam outlet end of the main steam heat supply pipeline is respectively communicated with a steam inlet of the main heat supply pipe through a heat supply three-way joint. The energy-saving device has the beneficial effects of meeting the requirements, along with simple structure and high energy efficiency.
Description
Technical Field
The invention relates to the technical field of heating systems, in particular to a supercritical turbine heating system.
Background
At present, along with the continuous development of economy in China, a thermal power generation system is more and more perfect, the thermal power generation system is more flexible and is convenient for the stability and peak shaving of a power grid, the deep peak shaving power generation is required to be continuously performed according to the power grid demand, meanwhile, the heat supply stability and the quality demand of heat users corresponding to thermal power enterprises are also continuously improved, and further, the industrial heat supply demand of supercritical turbine sets is also higher and higher.
Because the heat user has higher requirements on the temperature and the pressure of the heat supply steam, the current heat supply system adopting the supercritical turbine set mainly uses the first extraction steam of the supercritical turbine set to supply heat, and the steam parameters of the heat supply system cannot meet the requirements of the heat user. If the mixed heating of one extraction steam and main steam is adopted, the original compact and complex supercritical turbine system is more complex due to the newly added extraction steam pipeline. And because of the peak shaving power generation requirement of the supercritical turbine unit, the load rate of the unit is generally not high, and the parameters of the heating steam are regulated to parameters required by heat users by adopting the medium-pressure combined valve, so that the medium-pressure regulating valve is in a deep throttling state for a long time, the efficiency of a medium-pressure cylinder of the supercritical turbine is reduced by more than 10%, and the operation economy of the supercritical turbine is seriously influenced.
Therefore, a supercritical turbine heating system which meets the requirements, has a simple structure and is high in energy efficiency is needed.
Disclosure of Invention
First, the technical problem to be solved
In view of the above-mentioned drawbacks and shortcomings of the prior art, the present invention provides a heat supply system of a supercritical turbine, which solves the technical problems of insufficient demand, complex structure and low energy efficiency.
(II) technical scheme
In order to achieve the above purpose, the main technical scheme adopted by the invention comprises the following steps:
The invention provides a heat supply system of a supercritical steam turbine, which comprises a boiler for producing main steam and reheat steam, a supercritical steam turbine set, a main steam heat supply pipeline capable of being selectively switched on and off, a reheat steam heat supply pipeline capable of being selectively switched on and off and a total heat supply pipe. The supercritical steam turbine unit comprises a high-pressure cylinder and a medium-pressure cylinder, wherein a main steam main pipe is connected with a steam inlet of the high-pressure cylinder, and a reheating steam main pipe is connected with a steam inlet of the medium-pressure cylinder. The steam outlet end of the main steam outlet pipe of the boiler is respectively communicated with the steam inlet end of the main steam heating pipeline and the steam inlet end of the main steam main pipe through a main steam three-way joint, and the steam outlet of the high-pressure cylinder is communicated with the steam inlet of the boiler. The steam outlet end of the reheat steam outlet pipe of the boiler is respectively communicated with the steam inlet end of the reheat steam heating pipeline and the steam inlet end of the reheat steam main pipe through reheat steam three-way connectors. The steam outlet end of the main steam heat supply pipeline and the steam outlet end of the reheat steam heat supply pipeline are communicated with the steam inlet end of the main heat supply pipe through a heat supply three-way joint. The system comprises a main steam heat supply pipeline, a reheat steam heat supply pipeline, a main steam heat supply pipeline and a reheat steam heat supply pipeline, wherein when the load of the supercritical steam turbine unit is higher than 80% of the rated power of the supercritical steam turbine unit, the main steam heat supply pipeline is connected and disconnected to supply heat, and when the load of the supercritical steam turbine unit is lower than 70% of the rated power of the supercritical steam turbine unit, the main steam heat supply pipeline is connected and disconnected to supply heat.
Optionally, the main steam heating pipeline comprises a main steam branch pipe, a main steam temperature and pressure reducer and a main steam heating pipe which are sequentially communicated. The steam inlet end of the main steam branch pipe is connected with a main steam three-way joint, and the steam outlet end of the main steam heat supply pipe is connected with a heat supply three-way joint. The main steam branch pipe is sequentially provided with a first gate valve, a bypass, a second gate valve and a bypass, and the main steam heat supply pipe is sequentially provided with a first flowmeter and a first heat supply gate valve.
Optionally, the first gate valve and the bypass include a first gate valve and a first bypass communicating with main steam branch pipe portions on both sides of the first gate valve, and the first bypass is provided with two first bypass shutoff valves. The second gate valve and the bypass comprise a second gate valve and a second bypass communicated with main steam branch pipe parts at two sides of the second gate valve, and two second bypass stop valves are arranged on the second bypass. The second bypass part between the two second bypass stop valves is also communicated with a main steam drain pipe, and the main steam drain pipe is provided with a main steam drain valve.
Optionally, the reheat steam heating pipeline comprises a reheat steam branch pipe, a reheat steam temperature and pressure reducer and a reheat steam heating pipe which are sequentially connected. The steam inlet end of the reheat steam branch pipe is connected with the reheat steam three-way joint, and the steam outlet end of the reheat steam heat supply pipe is connected with the heat supply three-way joint. The reheat steam branch pipe is provided with a third gate valve and a bypass, and the reheat steam heating pipe is sequentially provided with a second flowmeter and a second heat supply gate valve.
Optionally, the third gate valve and the bypass comprise a third gate valve and a third bypass communicated with reheat steam branch pipe parts on two sides of the third gate valve, and two third bypass stop valves are arranged on the third bypass. And a reheat steam drain pipe is also communicated with a third bypass part between the two third bypass stop valves, and the reheat steam drain pipe is provided with a reheat steam drain valve.
Optionally, the boiler further comprises a water feeding pump and a desuperheating water pipeline, wherein the first water outlet of the water feeding pump is communicated with the water inlet of the boiler through the main water feeding pipeline. The temperature reducing water pipeline comprises a temperature reducing water pipe, a main steam temperature reducing water pipe and a reheat steam temperature reducing water pipe. The water inlet end of the temperature reducing water pipe is communicated with the second water outlet of the water feeding pump, and the water outlet end of the temperature reducing water pipe is respectively communicated with the water inlet end of the main steam temperature reducing water pipe and the water inlet end of the reheat steam temperature reducing water pipe through a temperature reducing water three-way joint. The water outlet end of the main steam temperature-reducing water pipe is communicated with a main steam heat supply pipeline for reducing temperature and pressure of main steam. The water outlet end of the reheat steam temperature reducing water pipe is communicated with a reheat steam heat supply pipeline and is used for reducing temperature and pressure of reheat steam.
Optionally, a first temperature reducing water component is arranged on the main steam temperature reducing water pipe, and a second temperature reducing water component is arranged on the reheat steam temperature reducing water pipe. The first temperature reduction water assembly comprises a first temperature reduction water electric stop valve, a first temperature reduction water filter, a first temperature reduction water electric regulating valve and a first temperature reduction water check valve which are sequentially arranged according to the temperature reduction water flow direction. The second temperature reduction water assembly comprises a second temperature reduction water electric stop valve, a second temperature reduction water filter, a second temperature reduction water electric regulating valve and a second temperature reduction water check valve which are sequentially arranged according to the temperature reduction water flow direction.
Optionally, a main steam stop valve and a main steam regulating valve are sequentially arranged on the main steam main pipe according to the main steam flow direction. The reheat steam main pipe is sequentially provided with a reheat steam stop valve and a reheat steam regulating valve according to the flow direction of reheat steam.
Optionally, a first drain pipeline is connected to the main steam heating pipe, and the first drain pipeline includes a first drain pipe, and a first drain stop valve and a first drain valve that are disposed on the first drain pipe.
Optionally, a second drain pipeline is connected to the reheat steam heating pipe, and the second drain pipeline includes a second drain pipe, and a second drain stop valve and a second drain valve that are disposed on the second drain pipe.
(III) beneficial effects
The beneficial effects of the invention are as follows:
According to the supercritical steam turbine heating system provided by the invention, the parameters of the main steam and the reheat steam are respectively adjusted through the main steam heating pipeline and the reheat steam heating pipeline, so that the parameters of the main steam and the reheat steam meet the requirements. And the main steam heat supply pipeline and the reheat steam heat supply pipeline are communicated with the total heat supply pipe through a heat supply three-way joint. When heating, according to the load of the supercritical turbine unit, the main steam heating pipeline or the reheat steam heating pipeline is selected for heating, so that the influence of the efficiency reduction of the medium pressure cylinder under the low load of the unit can be eliminated, the economy of heating under the high load of the unit can be ensured, the energy utilization efficiency is improved, and the two pipelines can be mutually used as standby heat sources, so that the continuous and stable heat sources can be ensured to be provided. Compared with the prior art, the device not only meets the requirements, but also has simple structure and high energy efficiency, and can provide a continuous and stable heat source.
Drawings
FIG. 1 is a schematic diagram of a connection structure of a heating system of a supercritical turbine according to an embodiment of the present invention;
FIG. 2 is a schematic diagram showing the connection structure of the first gate valve and the bypass and the second gate valve and the bypass according to the embodiment of the present invention;
FIG. 3 is a schematic view showing a connection structure of a third gate valve and a bypass according to an embodiment of the present invention;
FIG. 4 is a schematic view showing a connection structure of a first temperature reducing water assembly according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a connection structure of a first hydrophobic pipeline according to an embodiment of the present invention.
[ Reference numerals description ]
100 Parts of main steam outlet pipe, 101 parts of main steam three-way joint, 102 parts of main steam branch pipe, 103 parts of main steam main pipe, 104 parts of main steam stop valve, 105 parts of main steam regulating valve, 106 parts of first gate valve and bypass, 107 parts of second gate valve and bypass, 108 parts of main steam temperature and pressure reducer, 109 parts of first flowmeter, 110 parts of first heat supply gate valve, 111 parts of main steam heating pipe, 112 parts of first drain pipeline, 113 parts of first gate valve, 114 parts of first bypass stop valve, 115 parts of second gate valve, 116 parts of second bypass stop valve, 117 parts of main steam drain valve, 118 parts of first drain stop valve, 119 parts of first drain valve and 120 parts of heat supply bypass stop valve;
200 parts of reheat steam outlet pipe, 201 parts of reheat steam three-way joint, 202 parts of reheat steam branch pipe, 203 parts of reheat steam main pipe, 204 parts of reheat steam stop valve, 205 parts of reheat steam regulating valve, 206 parts of reheat steam check valve, 207 parts of third gate valve, bypass, 208 parts of reheat steam drain valve, 209 parts of reheat steam temperature and pressure reducer, 210 parts of second flowmeter, 211 parts of second heat supply gate valve, 212 parts of reheat steam heat supply pipe, 213 parts of second drain pipe, 214 parts of third gate valve, 215 parts of third bypass stop valve;
300 parts of a desuperheating water pipeline, 301 parts of a desuperheating water three-way joint, 302 parts of a first desuperheating water component, 303 parts of a second desuperheating water component, 304 parts of a first desuperheating water electric stop valve, 305 parts of a first desuperheating water filter, 306 parts of a first desuperheating water electric regulating valve and 307 parts of a first desuperheating water check valve;
400 parts of total heating pipes 401 parts of safety valves 402 parts of heating three-way connectors;
500 parts of a boiler, 501 parts of a high-pressure cylinder, 502 parts of a medium-pressure cylinder, 503 parts of a low-pressure cylinder, 504 parts of a water supply pump turbine, 505 parts of a water supply pump and 506 parts of a condenser.
Detailed Description
In order that the above-described aspects may be better understood, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
As shown in fig. 1 to 5, the specific embodiment of the present invention provides a heat supply system of a supercritical steam turbine, which has a core that a multi-element heat supply channel is formed by a main steam heat supply pipeline and a reheat steam heat supply pipeline, and can select the main steam heat supply pipeline to supply heat or the reheat steam heat supply pipeline to supply heat according to the load of the supercritical steam turbine unit, and the two heat supply pipelines can be mutually standby heat sources, so that the energy utilization efficiency is improved, and meanwhile, the continuous and stable heat source is ensured to be provided. The heating system specifically comprises a boiler 500 for producing main steam and reheat steam, a supercritical turbine set, a main steam heating pipeline capable of being selectively switched on and off, a reheat steam heating pipeline capable of being selectively switched on and off and a main heating pipe 400. The supercritical steam turbine unit comprises a high pressure cylinder 501 and a medium pressure cylinder 502, wherein the main steam main pipe 103 is connected with the steam inlet of the high pressure cylinder 501, and the reheat steam main pipe 203 is connected with the steam inlet of the medium pressure cylinder 502. The steam outlet end of the main steam outlet pipe 100 of the boiler 500 is respectively communicated with the steam inlet end of the main steam heating pipeline and the steam inlet end of the main steam main pipe 103 through the main steam three-way joint 101, and the steam outlet of the high-pressure cylinder 501 is communicated with the steam inlet of the boiler 500. The steam outlet end of the reheat steam outlet pipe 200 of the boiler 500 is respectively communicated with the steam inlet end of the reheat steam heating pipeline and the steam inlet end of the reheat steam main pipe 203 through the reheat steam three-way joint 201. The steam outlet end of the main steam heating pipeline and the steam outlet end of the reheat steam heating pipeline are communicated with the steam inlet end of the main heating pipe 400 through a heating three-way joint 402, and a safety valve 401 is arranged on the main heating pipe 400. The system comprises a main steam heat supply pipeline, a reheat steam heat supply pipeline, a main steam heat supply pipeline and a reheat steam heat supply pipeline, wherein when the load of the supercritical steam turbine unit is higher than 80% of the rated power of the supercritical steam turbine unit, the main steam heat supply pipeline is connected and disconnected to supply heat, and when the load of the supercritical steam turbine unit is lower than 70% of the rated power of the supercritical steam turbine unit, the main steam heat supply pipeline is connected and disconnected to supply heat. When the load of the supercritical turbine unit is 70% -80% of the rated power, one of the two heat supply pipelines can be selected. The heat supply flow rate in the total heat supply pipe 400 is 40-100 t/h, the temperature is 400-500 ℃, and the pressure is 3.4-4.5 MPa.
Specifically, in the heating system, the main steam and the reheat steam are separated into a part for heating through the main steam heating pipeline and the reheat steam heating pipeline, and parameters of the main steam and parameters of the reheat steam are respectively adjusted through the main steam heating pipeline and the reheat steam heating pipeline, so that the parameters of the main steam and the parameters of the reheat steam meet the requirements. The main steam heating pipeline and the reheat steam heating pipeline are communicated with the main heating pipe 400 through a heating three-way joint 402. When heating, according to the load of the supercritical turbine unit, the main steam heating pipeline is selected for heating or the reheat steam heating pipeline is selected for heating, so that the influence of the efficiency reduction of the medium pressure cylinder 502 under the low load of the unit can be eliminated, the economy of heating under the high load of the unit can be ensured, the energy utilization efficiency is improved, the two pipelines can be mutually used as standby heat sources, and the continuous and stable heat sources can be ensured to be provided. Compared with the prior art, the device meets the requirements, has simple structure and high energy efficiency, and can also provide a continuous and stable heat source.
Further, as shown in fig. 1, the supercritical steam turbine heating system provided in the embodiment of the invention further includes a water feeding pump 505 and a desuperheating water pipeline 300, wherein a first water outlet of the water feeding pump 505 is communicated with a water inlet of the boiler 500 through a main water feeding pipeline. The desuperheating water line 300 includes a desuperheating water pipe, a main steam desuperheating water pipe, and a reheat steam desuperheating water pipe. The water inlet end of the temperature reducing water pipe is communicated with the second water outlet of the water feeding pump 505, and the water outlet end of the temperature reducing water pipe 300 is respectively communicated with the water inlet end of the main steam temperature reducing water pipe and the water inlet end of the reheat steam temperature reducing water pipe through the temperature reducing water three-way joint 301. The water outlet end of the main steam temperature-reducing water pipe is communicated with a main steam heat supply pipeline for reducing temperature and pressure of main steam. The water outlet end of the reheat steam temperature reducing water pipe is communicated with a reheat steam heat supply pipeline and is used for reducing temperature and pressure of reheat steam.
Further, as shown in fig. 1 and 4, a first attemperation water component 302 is provided on the main steam attemperation water pipe, and a second attemperation water component 303 is provided on the reheat steam attemperation water pipe. The first desuperheating water assembly 302 includes a first desuperheating water electric shut-off valve 304, a first desuperheating water filter 305, a first desuperheating water electric regulating valve 306 and a first desuperheating water check valve 307, which are sequentially arranged in a desuperheating water flow direction. The second desuperheating water assembly 303 includes a second desuperheating water electric shut-off valve, a second desuperheating water filter, a second desuperheating water electric regulating valve and a second desuperheating water check valve, which are sequentially arranged according to the desuperheating water flow direction. The quality and flow rate of the main steam desuperheating water (desuperheating water for main steam) and the reheat steam desuperheating water (desuperheating water for reheat steam) are controlled through the first desuperheating water assembly 302 and the second desuperheating water assembly 303 respectively, the service lives of the main steam heating pipeline and the reheat steam heating pipeline are prolonged, and the service efficiency of the main steam desuperheating water and the reheat steam desuperheating water is improved. The circulation and the closure of the main steam temperature reduction water are controlled by a first temperature reduction water electric stop valve (304). The hardness of the main steam desuperheating water is reduced by the first desuperheating water filter 305, avoiding mineral precipitation on the inner wall of the main steam pipe, affecting the main steam flow rate and reducing the pipe life. The first temperature-reducing water electric regulating valve 306 is used for controlling the flow of the main steam temperature-reducing water, so that the use efficiency of the main steam temperature-reducing water is improved. The main steam desuperheating water is prevented from flowing backward by the first desuperheating water check valve 307. Likewise, the circulation and the closure of the reheat steam desuperheating water are controlled by a second electric stop valve. The hardness of the reheat steam temperature-reducing water is reduced through the second temperature-reducing water filter, mineral precipitation on the inner wall of a reheat steam pipeline is avoided, the reheat steam flow speed is influenced, and the pipeline service life is shortened. And the flow of the reheat steam desuperheating water is controlled through the second desuperheating water electric regulating valve, so that the service efficiency of the reheat steam desuperheating water is improved. The reheat steam is prevented from the reverse flow of the desuperheating water by the second desuperheating water check valve.
Further, as shown in fig. 1, the main steam heating line includes a main steam branch pipe 102, a main steam temperature and pressure reducer 108, and a main steam heating pipe 111, which are sequentially connected. The steam inlet end of the main steam branch pipe 102 is connected with the main steam three-way joint 101, and the steam outlet end of the main steam heating pipe 111 is connected with the heating three-way joint 402. The main steam branch pipe 102 is provided with a first gate valve and bypass 106 and a second gate valve and bypass 107 in this order, and the main steam heat supply pipe 111 is provided with a first flowmeter 109 and a first heat supply gate valve 110 in this order. The first heat supply gate valve 110 is also provided with a heat supply bypass and a heat supply bypass cut-off valve 120 on the heat supply bypass, so that the first heat supply gate valve 110 is opened and closed conveniently. The water outlet end of the main steam temperature-reducing water pipe is communicated with the main steam temperature-reducing pressure reducer 108, and the main steam with high temperature and high pressure is subjected to temperature reduction and pressure reduction through the main steam temperature-reducing pressure reducer 108, so that the main steam meets the parameter requirements of a heat user on steam. The primary steam flow in the primary steam heating pipe 111 is measured by the first flow meter 109, facilitating control of the primary steam flow as desired.
Specifically, the main steam heating pipe 111 is connected to the reheat steam heating pipe and the main heating pipe 400 through the heat supply three-way joint 402, when the reheat steam heating pipe is used for heating, reheat steam can warm the main steam heating pipe 111, and the structures such as the main steam heating pipe 111 and the valves on the main steam heating pipe 111 can slowly rise to be close to the working temperature, so that the main steam heating pipe 111 is in a hot standby state. Likewise, the main vapor manifold 102 needs to be in a hot standby state. The first gate valve and bypass 106 and the second gate valve and bypass 107 function to flexibly and precisely control a small amount of main steam to enter the main steam branch 102, slowly warm up the main steam branch 102 to near the operating temperature, and keep the main steam branch 102 near the operating temperature. The steam pipeline is in a hot standby state before being introduced with steam, namely the heating pipe. Therefore, when a large amount of high-temperature high-pressure steam is suddenly introduced into the cold steam pipeline, great thermal stress is generated on the structures such as the pipeline, the valve and the like, and the steam pipeline is prevented from being damaged. When steam enters the cold steam pipeline, condensation water is generated on the inner wall of the steam pipeline, so that a strong water hammer phenomenon is caused, and the pipeline is fallen or damaged.
Further, as shown in fig. 2, the first gate valve and bypass 106 includes a first gate valve 113 and a first bypass communicating with the main steam branch 102 portions on both sides of the first gate valve 113, and the first bypass is provided with two first bypass shutoff valves 114. The second gate valve and bypass 107 includes a second gate valve 115 and a second bypass communicating with the main vapor branch 102 portions on both sides of the second gate valve 115, and two second bypass shutoff valves 116 are provided on the second bypass. The second bypass portion between the two second bypass shut-off valves 116 is also in communication with a main steam trap, on which a main steam trap 117 is provided. Because in the high-pressure steam pipeline, the two sides of the closed gate valve have large pressure difference, the gate valve is easy to be blocked and generate excessive opening moment, and the bypass stop valve on the bypass are arranged on the steam pipeline at the two sides of the gate valve, so that before the gate valve is opened, the bypass stop valve can be opened first to charge the pressureless pipe section to reduce the pressure difference, and the resistance of opening the gate valve is reduced. Thereby, opening and closing of the first gate valve 113 and the second gate valve 115 are facilitated. The condensed water in the main steam branch pipe 102 is timely discharged through the main steam drain pipe. Therefore, condensed water is prevented from accumulating in the pipeline, and is quickly carried up by main steam to form a water hammer to strike the wall of the pipeline and the valve, so that the pipeline is damaged and even personal injury is caused. The main steam trap 117 has the greatest function of blocking steam and draining water (preventing steam and draining water), and preventing main steam from leaking, and is a valve for saving steam. The discharged condensed water can be selectively emptied or recycled according to the requirements.
Further, as shown in fig. 1, the reheat steam heating line includes a reheat steam branch pipe 202, a reheat steam temperature and pressure reducer 209, and a reheat steam heating pipe 212, which are sequentially connected. The steam inlet end of the reheat steam branch pipe 202 is connected with the reheat steam three-way joint 201, and the steam outlet end of the reheat steam heating pipe 212 is connected with the heating three-way joint 402. The reheat steam pipe 202 is provided with a third gate valve and bypass 207, and the reheat steam supply pipe 212 is provided with a second flowmeter 210 and a second heat supply gate valve 211 in this order. The outlet end of the reheat steam temperature reducing water pipe is connected with the reheat steam temperature reducing pressure reducer 209, and the reheat steam temperature reducing pressure reducer 209 is used for reducing the temperature and pressurizing the reheat steam with relative high temperature and high pressure so as to meet the parameter requirements of a heat user on the steam. The reheat steam flow in the reheat steam supply pipe 212 is measured by the second flow meter 210, facilitating control of the reheat steam flow as needed. The reheat steam manifold 202 is conveniently and flexibly controlled for heating by the third gate valve and bypass 207. The reheat steam manifold 202 is further provided with a reheat steam check valve 206, which prevents reheat steam from flowing backwards, affecting reheat steam flow rate.
Further, as shown in fig. 3, the third gate valve and bypass 207 includes a third gate valve 214 and a third bypass communicating with the reheat steam manifold 202 portion on both sides of the third gate valve 214, and two third bypass shutoff valves 215 are provided on the third bypass. The third bypass portion between the two third bypass shutoff valves 215 is also in communication with a reheat steam drain pipe, on which reheat steam drain valve 208 is disposed. Opening and closing of the third gate valve 214 is facilitated by the third bypass and the third bypass shutoff valve 215. Condensed water in the reheat steam manifold 202 is timely discharged through the reheat steam drain pipe, so that pipeline damage and even personal injury are avoided. The reheat steam drain valve 208 blocks steam drain and prevents reheat steam leakage.
Further, as shown in fig. 1, a main steam stop valve 104 and a main steam control valve 105 are provided in this order in the main steam main pipe 103, and a reheat steam stop valve 204 and a reheat steam control valve 205 are provided in this order in the reheat steam main pipe 203. The main steam shut-off valve 104 is used to control the flow and closing of the main steam into the high pressure cylinder 501. The main steam regulating valve 105 is used to control the flow of main steam into the high pressure cylinder 501. Reheat steam stop valve 204 is used to control the flow and closing of reheat steam that is introduced into intermediate pressure cylinder 502. Reheat steam regulator valve 205 is used to control the flow of reheat steam into intermediate pressure cylinder 502.
Further, as shown in fig. 1 and 5, a first drain pipe 112 is connected to the main steam heating pipe 111, and the first drain pipe 112 includes a first drain pipe, and a first drain stop valve 118 and a first drain valve 119 provided on the first drain pipe. The first drain pipe 112 serves to drain condensed water formed after the main steam is depressurized. The opening and closing of the first drain line 112 is controlled by a first shut-off valve. The steam is blocked from being discharged by the first drain valve 119, and the heat supply steam in the main steam heat supply pipe 111 is prevented from leaking.
Further, as shown in fig. 1, a second drain line 213 is connected to the reheat steam heating pipe 212, and the second drain line 213 includes a second drain pipe, and a second drain stop valve and a second drain valve provided on the second drain pipe. The opening and closing of the second drain line 213 is controlled by a second shut-off valve. The steam is blocked and drained by the second drain valve, preventing leakage of heating steam in the reheat steam supply pipe 212.
Further, as shown in fig. 1, the heating system further includes a condenser 506 and a feedwater pump turbine 504, which further includes a low pressure cylinder 503. The first steam outlet of the medium pressure cylinder 502 is communicated with the steam inlet of the low pressure cylinder 503, and the steam outlet of the low pressure cylinder 503 is communicated with the first steam inlet of the condenser 506. The second steam outlet of the intermediate pressure cylinder 502 is communicated with the steam inlet of the feed pump turbine 504, and the steam outlet of the feed pump turbine 504 is communicated with the second steam inlet of the condenser 506. The condenser 506 is used for condensing the exhaust steam discharged from the low-pressure cylinder 503 and the feed pump turbine 504 into water for reuse by the boiler 500, thereby forming a circulation system. The feedwater pump turbine 504 is used to drive the feedwater pump 505 to meet the water supply requirements required for the boiler 500 and the desuperheating water line 300.
Specifically, a steam turbine is a rotary power machine that converts energy of steam into mechanical work and is used as a prime mover for generating electricity. As shown in fig. 1, the boiler 500 introduces the produced high-temperature and high-pressure main steam into the high-pressure cylinder 501 to do work, the high-pressure cylinder 501 introduces the main steam after doing work into the boiler 500 for reheating, the boiler 500 introduces the reheated steam into the medium-pressure cylinder 502 to continue doing work, the medium-pressure cylinder 502 then introduces the reheated steam after doing work into the low-pressure cylinder 503 to continue doing work, and finally the low-pressure cylinder 503 introduces the exhaust steam into the condenser 506 to increase the utilization rate of energy in such a step-by-step work-doing manner. The rotor of the steam turbine drives the rotor of the generator through the coupler so as to drive the generator to generate electricity.
Preferably, the main steam temperature and pressure reducer 108 and the reheat steam temperature and pressure reducer 209 are both split type temperature and pressure reducers, and the depressurization is performed separately with a separate pressure reducing valve. The split temperature and pressure reducer has high control precision, stable operation and sensitive adjustment, and can effectively remove the static difference influence.
The heating system of the supercritical steam turbine provided in the specific embodiment of the invention has the specific working conditions that firstly, the main steam stop valve 104 and the main steam adjusting valve 105 are opened, the main steam main pipe 103 is conducted, the high-temperature and high-pressure main steam generated by the boiler 500 is introduced into the high-pressure cylinder 501 through the main steam main pipe 103 to apply work, the high-pressure cylinder 501 introduces the finished main steam into the boiler 500 to reheat and generate reheat steam, the reheat steam stop valve 204 and the reheat steam adjusting valve 205 are opened, the reheat steam main pipe 203 is conducted, and the reheat steam is introduced into the medium-pressure cylinder 502 through the reheat steam main pipe 203 to continue the subsequent work flow of the supercritical steam turbine. Then, a small amount of main steam is controlled to warm the main steam branch pipe 102 through the first bypass cut-off valve 114 and the second bypass cut-off valve 116, a small amount of reheat steam is controlled to warm the reheat steam branch pipe 202 through the third bypass cut-off valve 215, and the main steam branch pipe 102 and the reheat steam branch pipe 202 are kept in a hot standby state. The main steam heating pipe 111 is then warmed. After the heating pipe is completed, the first gate valve 113 and the second gate valve 115 are opened, the main steam branch pipe 102 is conducted, so that main steam is led into the main steam branch pipe 102 and enters the main steam temperature and pressure reducer 108, the main steam drain valve 117 is opened, and the main steam drain pipe is conducted to drain water in time. Meanwhile, the first temperature-reducing water electric regulating valve 306 is used for controlling the temperature-reducing water in the main steam temperature-reducing water pipe to be introduced into the main steam temperature-reducing pressure reducer 108, the temperature of the main steam is reduced to 400-500 ℃ through the main steam temperature-reducing pressure reducer 108, the pressure is reduced to 3.5-4.5 MPa, the heat supply steam formed after temperature reduction and pressure reduction is introduced into the main steam heating pipe 111, the first drain stop valve 118 and the first drain valve 119 are opened, the first drain pipeline 112 is conducted to drain water in time, and the heat supply steam flow is monitored through the first flowmeter 109, so that the adjustment is convenient in time. The first heat supply gate valve 110 is opened, and the main steam heat supply pipe 111 is turned on, so that the heat supply steam is introduced into the main heat supply pipe 400 to supply heat to the user. The reheat steam supply pipe 212 reaches a hot standby state by heating steam warming. In the process of heating by using main steam, when the load of the supercritical steam turbine exceeds 80% of the rated power of the supercritical steam turbine, the third gate valve 214 is opened first, the reheat steam branch pipe 203 is conducted, reheat steam is led into the reheat steam temperature and pressure reducer 209, the reheat steam drain valve 208 is opened, and the reheat steam drain pipe is conducted to drain water in time. Meanwhile, the second temperature-reducing water electric regulating valve is used for controlling the temperature-reducing water in the reheat steam temperature-reducing water pipe to be led into the reheat steam temperature-reducing pressure reducer 209, controlling the reheat steam temperature-reducing pressure reducer 209 to reduce the temperature of reheat steam to 400-500 ℃, reducing the pressure to 3.5-4.5 MPa, and leading into the main heating pipe 400. When the reheat steam is reduced in temperature and pressure, the main steam flow in the main steam branch pipe 102 is controlled to be gradually reduced through the first bypass stop valve 114 and the second bypass stop valve 116, after the parameters of the reheat steam are reduced in temperature and pressure to required parameters, the main steam branch pipe 102 is closed through the first gate valve 113 and the second gate valve 115, the reheat steam is used for heating, and the main steam heating pipe 111 can be maintained in a hot standby state under the action of the heating steam. In the process of heating by using the reheat steam, when the load of the supercritical steam turbine unit is lower than 70% of the rated power of the supercritical steam turbine unit, similarly, the main steam is firstly introduced into the main steam temperature and pressure reducer 108, the reheat steam flow in the reheat steam branch pipe 202 is gradually reduced while the main steam is subjected to temperature and pressure reduction, and after the parameters of the main steam are subjected to temperature and pressure reduction to required parameters, the reheat steam branch pipe 202 is closed. Thereby maintaining a stable heat source.
In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that alterations, modifications, substitutions and variations may be made in the above embodiments by those skilled in the art within the scope of the invention.
Claims (8)
1. The supercritical steam turbine heating system is characterized by comprising a boiler (500) for producing main steam and reheat steam, a supercritical steam turbine set, a main steam heating pipeline capable of being selectively switched on and off, a reheat steam heating pipeline capable of being selectively switched on and off and a main heating pipe (400);
The supercritical steam turbine unit comprises a high-pressure cylinder (501) and a medium-pressure cylinder (502), wherein a main steam main pipe (103) is connected to a steam inlet of the high-pressure cylinder (501), and a reheat steam main pipe (203) is connected to a steam inlet of the medium-pressure cylinder (502);
the steam outlet end of the main steam outlet pipe (100) of the boiler (500) is respectively communicated with the steam inlet end of the main steam heating pipeline and the steam inlet end of the main steam main pipe (103) through a main steam three-way joint (101), and the steam outlet of the high-pressure cylinder (501) is communicated with the steam inlet of the boiler (500);
The steam outlet end of the reheat steam outlet pipe (200) of the boiler (500) is respectively communicated with the steam inlet end of the reheat steam heating pipeline and the steam inlet end of the reheat steam main pipe (203) through a reheat steam three-way joint (201);
The steam outlet end of the main steam heating pipeline and the steam outlet end of the reheat steam heating pipeline are communicated with the steam inlet end of the total heating pipe (400) through a heating three-way joint (402);
When the load of the supercritical turbine unit exceeds 80% of the rated power of the supercritical turbine unit, a reheat steam heating pipeline is conducted, a main steam heating pipeline is disconnected, and the reheat steam heating pipeline is used for heating;
when the load of the supercritical turbine unit is lower than 70% of the rated power, the main steam heating pipeline is conducted, the reheat steam heating pipeline is disconnected, and the main steam heating pipeline is used for heating;
the main steam heating pipeline comprises a main steam branch pipe (102), a main steam temperature and pressure reducer (108) and a main steam heating pipe (111) which are sequentially communicated;
The steam inlet end of the main steam branch pipe (102) is communicated with a main steam three-way joint (101), and the steam outlet end of the main steam heating pipe (111) is communicated with a heating three-way joint (402);
A first gate valve and a bypass (106) and a second gate valve and a bypass (107) are sequentially arranged on the main steam branch pipe (102);
A first flowmeter (109) and a first heat supply gate valve (110) are sequentially arranged on the main steam heat supply pipe (111);
The reheat steam heating pipeline comprises a reheat steam branch pipe (202), a reheat steam temperature and pressure reducer (209) and a reheat steam heating pipe (212) which are sequentially connected;
The steam inlet end of the reheat steam branch pipe (202) is connected with a reheat steam three-way joint (201), and the steam outlet end of the reheat steam heating pipe (212) is connected with a heating three-way joint (402);
A third gate valve and a bypass (207) are arranged on the reheat steam branch pipe (202), and a second flowmeter (210) and a second heat supply gate valve (211) are sequentially arranged on the reheat steam heat supply pipe (212).
2. The heating system of the supercritical turbine according to claim 1, wherein,
The first gate valve and bypass (106) comprises a first gate valve (113) and a first bypass communicated with the main steam branch pipe (102) at two sides of the first gate valve (113), and two first bypass stop valves (114) are arranged on the first bypass;
The second gate valve and bypass (107) comprises a second gate valve (115) and a second bypass communicated with the main steam branch pipe (102) at two sides of the second gate valve (115), and two second bypass stop valves (116) are arranged on the second bypass;
the second bypass portion between the two second bypass shut-off valves (116) is also in communication with a main steam trap, on which a main steam trap (117) is provided.
3. The heating system of the supercritical turbine according to claim 1, wherein,
The third gate valve and bypass (207) comprises a third gate valve (214) and a third bypass communicated with the reheat steam branch pipe (202) at two sides of the third gate valve (214), and two third bypass stop valves (215) are arranged on the third bypass;
the third bypass part between the two third bypass stop valves (215) is also communicated with a reheat steam drain pipe, and a reheat steam drain valve (208) is arranged on the reheat steam drain pipe.
4. The heating system of the supercritical turbine according to claim 1, wherein,
The boiler also comprises a water feeding pump (505) and a desuperheating water pipeline (300), wherein a first water outlet of the water feeding pump (505) is communicated with a water inlet of the boiler (500) through a main water feeding pipeline;
The water outlet end of the temperature reducing pipeline (300) is respectively communicated with the water inlet end of the main steam temperature reducing water pipe and the water inlet end of the reheat steam temperature reducing water pipe through a temperature reducing three-way joint (301);
the water outlet end of the reheating steam temperature reducing water pipe is connected with the reheating steam heat supply pipeline and is used for reducing the temperature and the pressure of the reheating steam.
5. The heating system of the supercritical turbine according to claim 4, wherein,
A first temperature reducing water component (302) is arranged on the main steam temperature reducing water pipe, and a second temperature reducing water component is arranged on the reheat steam temperature reducing water pipe;
The first desuperheating water assembly (302) comprises a first desuperheating water electric stop valve (304), a first desuperheating water filter (305), a first desuperheating water electric regulating valve (306) and a first desuperheating water check valve (307) which are sequentially arranged according to the desuperheating water flow direction;
The second temperature-reducing water component (303) comprises a second temperature-reducing water electric stop valve, a second temperature-reducing water filter, a second temperature-reducing water electric regulating valve and a second temperature-reducing water check valve which are sequentially arranged according to the temperature-reducing water flow direction.
6. The heating system of the supercritical turbine according to claim 1, wherein,
A main steam stop valve (104) and a main steam regulating valve (105) are sequentially arranged on the main steam main pipe (103) according to the main steam flow direction;
a reheat steam cut-off valve (204) and a reheat steam regulating valve (205) are sequentially arranged on the reheat steam main pipe (203) according to the reheat steam flow direction.
7. The heating system of the supercritical turbine according to claim 1, wherein,
A first drain pipeline (112) is connected to the main steam heating pipe (111), and the first drain pipeline (112) comprises a first drain pipe, a first drain stop valve (118) and a first drain valve (119) which are arranged on the first drain pipe.
8. The heating system of the supercritical turbine according to claim 1, wherein,
A second drain pipeline (213) is connected to the reheat steam heating pipe (212), and the second drain pipeline (213) comprises a second drain pipe, and a second drain stop valve and a second drain valve which are arranged on the second drain pipe.
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| CN118980116B (en) * | 2024-09-03 | 2025-10-28 | 马鞍山钢铁股份有限公司 | A hot standby device for superheated steam temperature and pressure reduction system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11210407A (en) * | 1998-01-22 | 1999-08-03 | Fuji Electric Co Ltd | Method and apparatus for warming up a bypass valve in a steam plant |
| CN110344899A (en) * | 2019-07-17 | 2019-10-18 | 河北冀研能源科学技术研究院有限公司 | The system and method for high pressure industry steam supply ability is mentioned under a kind of power plant underload |
| CN217978975U (en) * | 2022-08-26 | 2022-12-06 | 北京国能龙威发电技术有限公司 | Supercritical steam turbine heating system |
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| RU2565945C2 (en) * | 2014-03-12 | 2015-10-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования Самарский государственный технический универстет | Combined heat power plant with open district heating system |
| CN206144612U (en) * | 2016-11-14 | 2017-05-03 | 中国电力工程顾问集团西南电力设计院有限公司 | Utilize supercritical unit to realize high pressure cylinder steam extracting and heat supplying combined heat and power generation system |
| CN108361086B (en) * | 2018-02-08 | 2020-07-28 | 西安交通大学 | Energy-saving thermoelectric decoupling system and operation method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11210407A (en) * | 1998-01-22 | 1999-08-03 | Fuji Electric Co Ltd | Method and apparatus for warming up a bypass valve in a steam plant |
| CN110344899A (en) * | 2019-07-17 | 2019-10-18 | 河北冀研能源科学技术研究院有限公司 | The system and method for high pressure industry steam supply ability is mentioned under a kind of power plant underload |
| CN217978975U (en) * | 2022-08-26 | 2022-12-06 | 北京国能龙威发电技术有限公司 | Supercritical steam turbine heating system |
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