CN209855863U - Device for shortening cold starting time of steam turbine - Google Patents
Device for shortening cold starting time of steam turbine Download PDFInfo
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- CN209855863U CN209855863U CN201920473389.XU CN201920473389U CN209855863U CN 209855863 U CN209855863 U CN 209855863U CN 201920473389 U CN201920473389 U CN 201920473389U CN 209855863 U CN209855863 U CN 209855863U
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Abstract
The utility model discloses a shorten device of steam turbine cold starting time, including the pipeline part, equipment portion and valve part, the pipeline part contains the main pipe of auxiliary steam, branch pipe and connecting pipe, the equipment portion includes the high pressure jar, the intermediate pressure jar, low pressure jar and condenser, the valve part contains the isolating valve, the check valve, the device adopts the mode of warming up the high pressure jar in advance, can shorten the steam turbine low-speed warm-up time under the cold starting mode, thereby make the steam turbine advance the on-load electricity generation, reduce the consumption of fuel and station service electricity, improve the economic nature of unit electricity generation, reach energy saving and emission reduction's purpose to a certain extent.
Description
Technical Field
The utility model relates to a steam turbine field especially relates to a shorten device of steam turbine cold starting time.
Background
The current F-level gas-steam combined cycle unit (400 MW level) steam turbine (HE type three-pressure reheating double-cylinder axial steam-discharging condensing type) cold-state starting and warming-up mode is as follows: in a cold state mode, namely the calculated temperature of a high-medium pressure rotor of the steam turbine is less than 150 ℃, the low-speed warming-up is started when the steam turbine is rushed to 910 r/min, a mode of warming up a high-pressure cylinder firstly and warming up a middle-pressure cylinder secondly is adopted, during the warming-up of the high-pressure cylinder, a high-pressure main steam governing valve is kept at about 7% opening degree for warming-up, the middle-pressure main steam governing valve is about 1% opening degree, at the moment, the middle-pressure cylinder hardly enters steam, the metal temperature of the middle-pressure cylinder and the rotor is improved only by air blasting energy, after the central temperature of the high-pressure rotor exceeds 300 ℃, the high-pressure main steam governing valve is adjusted to about 4% opening degree, meanwhile, the middle-pressure main steam governing valve is adjusted to about 2% opening degree for warming-; according to the starting process and the starting time curve, the warm-up time of the high-pressure cylinder of the steam turbine is about 100min, and the warm-up time of the intermediate-pressure cylinder is about 150 min.
Under the cold-state starting and warming-up mode of an F-grade gas-steam combined cycle unit (400 MW grade) steam turbine (HE type three-pressure reheating double-cylinder axial steam-discharging condensing type), the warming-up time of a high-pressure cylinder is about 100min, the warming-up time of a medium-pressure cylinder is about 150min, the low-speed warming-up time of the steam turbine is long, the delayed load power generation of the steam turbine can be caused, and a large amount of fuel and station service power are consumed.
The mode of pre-warming the high-pressure cylinder in advance is adopted, and the low-speed warming time of the steam turbine in the cold starting mode can be shortened, so that the steam turbine generates power under load in advance, the consumption of fuel and station service power is reduced, the economical efficiency of unit power generation is improved, and the purposes of energy conservation and emission reduction are achieved to a certain extent.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the weak point among the prior art, provide one kind and can shorten the low-speed warm-up time of steam turbine under the cold starting mode to make the load electricity generation of steam turbine advance, reduce the consumption of fuel and station service power, improve the economic nature of unit electricity generation, reach energy saving and emission reduction's purpose to a certain extent and shorten the transformation technique of steam turbine cold starting time through warming up the steam turbine high pressure cylinder in advance.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a device for shortening cold start time of a steam turbine comprises
The pipeline part comprises an auxiliary steam main pipe, a branch pipe and a connecting pipe, the equipment part comprises a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder and a condenser, the valve part comprises an isolation valve, a check valve and a check valve, the auxiliary steam main pipe is sequentially provided with an electric isolation valve, an electric regulating valve, a check valve and a manual isolation valve, the branch pipe is provided with a front exhaust steam ventilation valve of the high-exhaust check valve, the communication part of the auxiliary steam main pipe and the branch pipe is provided with the high-exhaust check valve, the high-pressure cylinder, the medium-pressure cylinder, the low-pressure cylinder and the condenser are sequentially connected, two ends of the connecting pipe are respectively communicated with the high-pressure cylinder and the condenser, the high-pressure cylinder is connected with a high-pressure main steam valve and a high-pressure regulating valve, the high-pressure regulating valve is also connected with a hot air maintenance device, and the low-pressure cylinder is connected with a high-pressure shaft seal exhaust valve, the condenser is connected with a high-pressure shaft seal cavity to a condenser exhaust valve.
Preferably, the steam turbine needs to be warmed up at a low speed in a cold start mode, and the purpose is to increase the metal temperature of the turbine rotor to a temperature higher than the brittle transition temperature. When the metal low-temperature brittle transition temperature FATT value (80-130 ℃) of the turbine rotor is lower than the metal low-temperature brittle transition temperature FATT value, brittle cracks are easily generated under the action of high-speed centrifugal force, and therefore the purpose of low-speed warming-up in the cold starting mode of the turbine is to enable the metal temperature of the turbine rotor to be increased to be higher than the brittle transition temperature, enable the turbine cylinder body and the rotor to be fully heated and uniformly expanded, and avoid the brittle cracks generated when the rotor is accelerated to the rated rotation speed (3000 rpm).
Preferably, before the turbine starts to rotate in a cold state, the external steam is used for steaming in a turning state of the turbine
The steam system pre-warms the high-pressure cylinder by controlling the steam pressure by the high-pressure cylinder pre-warming regulating valve, so that the temperature of metal in the high-pressure cylinder is raised to be more than 150 ℃, and the high-pressure cylinder body is fully pre-warmed. The temperature of the high-pressure rotor is increased to be higher than the brittle transition temperature, the cold-state starting of the steam turbine is changed into the warm-state starting, and the whole starting time of the steam turbine is shortened by about 100 min.
Preferably, the steam turbine adopts a mode of reversely heating a high-pressure cylinder by an external steam source, the auxiliary steam main pipe is connected with a pipeline and led into a steam exhaust pipe of the high-pressure cylinder of the steam turbine, and the auxiliary steam reversely enters the high-pressure cylinder from high exhaust.
Preferably, the auxiliary steam main pipe is also provided with an automatic steam trap for ensuring that the steam entering the high-pressure cylinder is dry steam.
Preferably, the steam is preheated and then is discharged into the condenser from a high-pressure shaft seal cavity to a condenser exhaust valve.
Preferably, when the steam turbine unit operates normally, the maximum pressure borne by each valve in the pipeline is less than or equal to 3.25 MPa, and the maximum temperature borne by each valve in the pipeline is less than or equal to 367 ℃. When the unit normally operates, the maximum pressure and temperature borne by each valve in the back-warming scheme are the exhaust pressure and temperature of the high-pressure cylinder, the pressure of high-exhaust steam is 3.25 MPa, and the temperature is 367 ℃, so that the maximum temperature and pressure borne by each valve in the back-warming scheme are lower, namely the requirements on the materials of the valve and the pipeline are relatively lower, and the back-warming scheme is economical and safe.
The utility model discloses the beneficial technological effect who possesses is: by adopting the mode of pre-warming the high-pressure cylinder in advance, the low-speed warming-up time of the steam turbine in the cold-state starting mode can be shortened, the cold-state starting time of the steam turbine is shortened by about 100min, the steam turbine can generate power with load in advance for 100min, the response speed and the generated energy of power generation are improved, the fuel consumption and the service power consumption of the original high-pressure cylinder in the state of warming up the high-pressure cylinder at low speed for 100min are saved, the power generation economy of a unit is improved, and the purposes of energy conservation; meanwhile, the implementation of the transformation technology is simple, the investment is low, the cost is within 10 ten thousand yuan RMB, and the use is safe.
Drawings
FIG. 1 is a diagram of a back-warming system of the external steam source high pressure cylinder of the present invention;
in the figure: the auxiliary steam main pipe 11, the branch pipe 12, the connecting pipe 13, the high-pressure cylinder 21, the intermediate-pressure cylinder 22, the low-pressure cylinder 23, the condenser 24, the electric isolation valve 31, the electric regulating valve 32, the check valve 33, the manual isolation valve 34, the high-pressure exhaust check valve 35, the high-pressure exhaust check valve front exhaust steam ventilation valve 36, the high-pressure main steam valve 37, the high-pressure regulating valve 38, the high-pressure shaft seal one-cavity-to-low-pressure-cylinder exhaust valve 310 and the high-pressure shaft seal one-cavity-to-condenser exhaust valve 311.
Detailed Description
The following further description of the present invention will be made with reference to the accompanying drawings, and the following description of the embodiments will help the public to understand the present invention, but the specific embodiments given by the applicant should not be construed as limiting the technical solution of the present invention, and any changes in the definition of the components or technical features or in the form of the whole structure rather than the essential changes should be construed as the protection scope defined by the technical solution of the present invention.
As shown in FIG. 1, an apparatus for reducing cold start-up time of a steam turbine includes
The pipeline part comprises an auxiliary steam main pipe, a branch pipe and a connecting pipe, the equipment part comprises a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder and a condenser, the valve part comprises an isolation valve, a check valve and a check valve, the auxiliary steam main pipe is sequentially provided with an electric isolation valve, an electric regulating valve, a check valve and a manual isolation valve, the branch pipe is provided with a front exhaust steam ventilation valve of the high-exhaust check valve, the communication part of the auxiliary steam main pipe and the branch pipe is provided with the high-exhaust check valve, the high-pressure cylinder, the medium-pressure cylinder, the low-pressure cylinder and the condenser are sequentially connected, two ends of the connecting pipe are respectively communicated with the high-pressure cylinder and the condenser, the high-pressure cylinder is connected with a high-pressure main steam valve and a high-pressure regulating valve, the high-pressure regulating valve is also connected with a hot air maintenance device, and the low-pressure cylinder is connected with a high-pressure shaft seal exhaust valve, the condenser is connected with a high-pressure shaft seal cavity to a condenser exhaust valve, the steam turbine needs to be warmed up at a low speed in a cold starting mode, and the aim is to increase the metal temperature of a steam turbine rotor to be higher than the brittle transition temperature; when the metal low-temperature brittle transition temperature FATT value (80-130 ℃) of the steam turbine rotor is lower than the metal low-temperature brittle transition temperature FATT value, brittle cracks are easily generated under the action of high-speed centrifugal force, so that the purpose of low-speed warming-up in the cold starting mode of the steam turbine is to enable the metal temperature of the steam turbine rotor to be increased to be higher than the brittle transition temperature, enable a steam turbine cylinder body and the rotor to be fully heated and uniformly expanded, and avoid the brittle cracks generated when the rotor is accelerated to the rated rotation speed (3000 rpm); before the steam turbine is started and rushed to rotate in a cold state, in a turning state of the steam turbine, the high-pressure cylinder is pre-warmed by an external steam system and the steam pressure is controlled by a high-pressure cylinder pre-warming regulating valve, so that the temperature of metal in the high-pressure cylinder is increased to be higher than 150 ℃, the high-pressure cylinder body is fully pre-warmed, the temperature of a high-pressure rotor is increased to be higher than the brittle transition temperature, the cold-state starting of the steam turbine is changed into the warm-state starting, and the whole starting time of the steam turbine is shortened by about 100 min; the steam turbine adopts a mode of externally connecting a steam source to reversely warm the high-pressure cylinder, an auxiliary steam main pipe is connected with a pipeline and is led into a steam exhaust pipe of the high-pressure cylinder of the steam turbine, and auxiliary steam reversely enters the high-pressure cylinder from high exhaust; the auxiliary steam main pipe is also provided with an automatic steam trap used for ensuring that the steam entering the high-pressure cylinder is dry steam; the steam is preheated and then is discharged into the condenser from a high-pressure shaft seal cavity to a condenser exhaust valve; when the steam turbine unit normally operates, the maximum pressure borne by each valve in the pipeline is less than or equal to 3.25 MPa, and the maximum temperature borne by each valve is less than or equal to 367 ℃; when the unit normally operates, the maximum pressure and temperature borne by each valve in the back-warming scheme are the exhaust pressure and temperature of the high-pressure cylinder, the pressure of high-exhaust steam is 3.25 MPa, and the temperature is 367 ℃, so that the maximum temperature and pressure borne by each valve in the back-warming scheme are lower, namely the requirements on the materials of the valve and the pipeline are relatively lower, and the back-warming scheme is economical and safe.
In the embodiment, the device adopts a mode of pre-warming the high-pressure cylinder in advance, and can shorten the low-speed warm-up time of the steam turbine in a cold starting mode, so that the steam turbine generates power under a load in advance, the consumption of fuel and station service power is reduced, the economy of unit power generation is improved, the purposes of energy conservation and emission reduction are realized, and meanwhile, the improvement technology is simple to implement, low in investment and safe to use.
Of course, the present invention can have other various embodiments, and those skilled in the art can make various corresponding changes and modifications according to the present invention without departing from the spirit and the essence of the present invention, and these corresponding changes and modifications should fall within the protection scope of the appended claims.
Claims (7)
1. The utility model provides a shorten device of turbine cold starting time, a serial communication port, including pipeline part, equipment portion and valve part, pipeline part contain and assist female pipe of vapour (11), branch pipe (12) and connecting pipe (13), equipment portion include high pressure cylinder (21), intermediate pressure cylinder (22), low pressure jar (23) and condenser (24), valve part including isolation valve, check valve, auxiliary vapour female pipe on install electronic isolation valve (31), electronic governing valve (32), check valve (33) and manual isolation valve (34) in proper order, install high exhaust check valve front row of vapour ventilation valve (36) on the branch pipe, auxiliary vapour female pipe is equipped with high exhaust check valve (35) with branch pipe department, high pressure cylinder, intermediate pressure cylinder, low pressure cylinder and condenser connect gradually, the both ends of connecting pipe respectively with high pressure cylinder UNICOM, Condenser looks UNICOM, be connected with high pressure main throttle (37) and high pressure valve (38) on the high pressure jar, the high pressure valve still links to each other with hot-blast maintenance device, the low pressure jar is connected with a high pressure shaft seal chamber to low pressure jar discharge valve (310), the condenser is connected with a high pressure shaft seal chamber to condenser discharge valve (311).
2. An apparatus for reducing the cold start-up time of a steam turbine according to claim 1 wherein the steam turbine is warmed up at a low rate during cold start-up in order to raise the metal temperature of the turbine rotor above the brittle transition temperature.
3. The apparatus according to claim 1, wherein the steam turbine is pre-warmed by the high pressure cylinder by an external steam system and by means of the high pressure cylinder pre-warming regulating valve to control the steam pressure, so as to raise the metal temperature in the high pressure cylinder to above 150 ℃ and fully pre-warm the high pressure cylinder body, before the cold start surge.
4. The apparatus according to claim 1, wherein the steam turbine is operated in a reverse-warming high pressure cylinder mode with an external steam source, the auxiliary steam main pipe is connected with a pipeline and led into a steam exhaust pipe of the high pressure cylinder of the steam turbine, and the auxiliary steam is reversely led into the high pressure cylinder from the high exhaust pipe.
5. The apparatus according to claim 1, wherein the auxiliary steam main is further provided with an automatic steam trap for ensuring that the steam entering the high pressure cylinder is dry steam.
6. The apparatus according to claim 5, wherein the steam is preheated and then discharged into the condenser through a high pressure shaft seal chamber to the condenser exhaust valve.
7. The apparatus according to claim 1, wherein the valves in the steam turbine are subjected to a maximum pressure of less than or equal to 3.25 MPa and a maximum temperature of less than or equal to 367 ℃ during normal operation of the steam turbine plant.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920473389.XU CN209855863U (en) | 2019-04-09 | 2019-04-09 | Device for shortening cold starting time of steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920473389.XU CN209855863U (en) | 2019-04-09 | 2019-04-09 | Device for shortening cold starting time of steam turbine |
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| CN209855863U true CN209855863U (en) | 2019-12-27 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112065513A (en) * | 2020-08-20 | 2020-12-11 | 中广核太阳能德令哈有限公司 | Temperature state starting control method for steam turbine of groove type solar thermal power station |
| CN113356939A (en) * | 2021-07-20 | 2021-09-07 | 广东韶钢松山股份有限公司 | Method and system for rapidly starting main pipe unit in cold state |
| CN113586174A (en) * | 2021-08-05 | 2021-11-02 | 北京全四维动力科技有限公司 | Cylinder warming valve group, steam turbine and cylinder warming method of steam turbine |
| CN114251138A (en) * | 2020-09-23 | 2022-03-29 | 上海电气电站设备有限公司 | Steam supplementing type starting method of steam turbine unit |
| CN114622958A (en) * | 2020-12-11 | 2022-06-14 | 上海电气电站设备有限公司 | Steam inlet valve coordinated starting method for starting steam turbine |
-
2019
- 2019-04-09 CN CN201920473389.XU patent/CN209855863U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112065513A (en) * | 2020-08-20 | 2020-12-11 | 中广核太阳能德令哈有限公司 | Temperature state starting control method for steam turbine of groove type solar thermal power station |
| CN112065513B (en) * | 2020-08-20 | 2022-06-28 | 中广核太阳能德令哈有限公司 | Temperature state starting control method for steam turbine of groove type solar thermal power station |
| CN114251138A (en) * | 2020-09-23 | 2022-03-29 | 上海电气电站设备有限公司 | Steam supplementing type starting method of steam turbine unit |
| CN114251138B (en) * | 2020-09-23 | 2024-03-19 | 上海电气电站设备有限公司 | Steam supplementing type starting method of steam turbine unit |
| CN114622958A (en) * | 2020-12-11 | 2022-06-14 | 上海电气电站设备有限公司 | Steam inlet valve coordinated starting method for starting steam turbine |
| CN113356939A (en) * | 2021-07-20 | 2021-09-07 | 广东韶钢松山股份有限公司 | Method and system for rapidly starting main pipe unit in cold state |
| CN113356939B (en) * | 2021-07-20 | 2022-10-14 | 广东韶钢松山股份有限公司 | Method and system for cold-state quick start of main pipe unit |
| CN113586174A (en) * | 2021-08-05 | 2021-11-02 | 北京全四维动力科技有限公司 | Cylinder warming valve group, steam turbine and cylinder warming method of steam turbine |
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