CN113250761A - Low-pressure cylinder shaft seal steam flow testing system of high-medium pressure cylinder-combined steam turbine - Google Patents
Low-pressure cylinder shaft seal steam flow testing system of high-medium pressure cylinder-combined steam turbine Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
- F01D11/04—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type using sealing fluid, e.g. steam
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Abstract
The invention discloses a low-pressure cylinder shaft seal steam flow testing system of a high-medium pressure cylinder-combined steam turbine, which comprises a high-medium pressure cylinder-combined cylinder shaft seal overflow steam temperature measuring module, a high-medium pressure cylinder-combined cylinder shaft seal overflow steam pressure measuring module, a desuperheating water adjusting module, a low-pressure cylinder shaft seal steam inlet temperature measuring module, a low-pressure cylinder shaft seal steam inlet pressure measuring module, a shaft seal desuperheating water temperature measuring module, a shaft seal desuperheating water pressure measuring module, a shaft seal desuperheating water flow measuring module and a data acquisition and control module. According to the embodiment of the invention, the temperature, the pressure and the flow of the corresponding pipeline are monitored through the data acquisition and control module, so that the shaft seal overflow steam flow detection of the high and medium pressure cylinder can be realized.
Description
Technical Field
The invention relates to the technical field of flow measurement and control of a steam turbine generator unit and thermal equipment thereof, in particular to a low-pressure cylinder shaft seal steam flow test system of a high-medium pressure cylinder combined steam turbine.
Background
The shaft seal system of the turbo generator set with the high and medium pressure combined cylinders is an important device for preventing air from entering the cylinders and recycling steam leakage of the cylinders. In the starting or low-load stage of the steam turbine generator unit, in order to realize the formation of vacuum in a steam chamber of the condenser, steam seal is required to be supplied to a steam seal of a high-intermediate pressure cylinder and a steam seal of a low-pressure cylinder of the steam turbine, and the condenser can form vacuum after non-condensable gas is pumped by a vacuum pump; during the high load stage of the steam turbine generator unit, as the steam flowing out of the shaft seal of the high and medium pressure combined cylinder increases, the steam flowing out of the shaft seal is enough to meet the steam quantity of the shaft seal of the low pressure combined cylinder, so that self-sealing is formed. The size of a gap between a shaft seal tooth and a rotor of a steam turbine shaft seal system directly determines the steam flow of the shaft seal, and the operation efficiency and the energy consumption loss of the steam turbine are influenced. During the operation of the unit, the size of the gap between the shaft seal teeth and the rotor cannot be tested due to high-speed rotation of the turbine rotor, and the short-time shutdown cannot be tested due to the fact that the turbine rotor is still at high temperature and the dismounting process is complex. However, the steam quantity leaked outwards by the shaft seal reflects the size of the gap between the shaft seal teeth of the high and medium pressure combined cylinder and the rotor, and the steam flow supplied to the shaft seal reflects the size of the gap between the shaft seal teeth of the low pressure combined cylinder and the rotor. The clearance grow is caused to long-term friction of shaft seal and rotor in the long-term operation process of unit, and the corresponding grow of shaft seal steam flow can judge the clearance size variation trend between shaft seal tooth and the rotor through the change of shaft seal steam flow to whether need overhaul the maintenance for the steam turbine shaft seal and provide the basis.
However, the existing unit running in service is generally not provided with a testing device to monitor the steam flow of the shaft seal, and the variation trend of the size of the gap between the shaft seal teeth and the rotor cannot be judged.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a low-pressure cylinder shaft seal steam flow testing system of a high-medium pressure combined cylinder steam turbine.
In order to solve some of the above technical problems, an embodiment of the present invention provides a low-pressure cylinder shaft seal steam flow rate test system for a high-intermediate pressure cylinder-in-cylinder steam turbine, where the system includes a high-intermediate pressure cylinder-in-cylinder shaft seal overflow steam temperature measurement module, a high-intermediate pressure cylinder-in-cylinder shaft seal overflow steam pressure measurement module, a desuperheating water adjustment module, a low-pressure cylinder shaft seal steam inlet temperature measurement module, a low-pressure cylinder shaft seal steam inlet pressure measurement module, a shaft seal desuperheating water temperature measurement module, a shaft seal desuperheating water pressure measurement module, a shaft seal desuperheating water flow rate measurement module, and a data acquisition and control module;
the data acquisition and control module is respectively electrically connected with the high-medium pressure cylinder closing shaft seal overflow steam temperature measurement module, the low-pressure cylinder shaft seal inlet steam temperature measurement module, the shaft seal temperature reduction water temperature measurement module, the high-medium pressure cylinder closing shaft seal overflow steam pressure measurement module, the temperature reduction water regulation module, the low-pressure cylinder shaft seal inlet steam pressure measurement module, the shaft seal temperature reduction water pressure measurement module and the shaft seal temperature reduction water flow measurement module.
Preferably, the system also comprises a shaft seal temperature reduction water pipe, a low-pressure cylinder shaft seal steam inlet main pipe and a high-medium pressure combined cylinder shaft seal overflow steam collecting pipe;
the low-pressure cylinder shaft seal steam inlet main pipe is connected with the shaft seal temperature reduction water pipe and the high-medium pressure cylinder shaft seal overflow steam collecting pipe;
the high-medium pressure cylinder and cylinder combined shaft seal overflow steam temperature measuring module, the high-medium pressure cylinder and cylinder combined shaft seal overflow steam pressure measuring module and the low-pressure cylinder and cylinder shaft seal inlet steam adjusting module are arranged on the high-medium pressure cylinder and cylinder combined shaft seal overflow steam collecting pipe;
the shaft seal desuperheating water flow measuring module, the shaft seal desuperheating water pressure measuring module, the shaft seal desuperheating water temperature measuring module and the desuperheating water adjusting module are arranged on the shaft seal desuperheating water pipe;
the low-pressure cylinder shaft seal steam inlet main pipe is provided with the low-pressure cylinder shaft seal steam inlet pressure measuring module and the low-pressure cylinder shaft seal steam inlet temperature measuring module.
Preferably, the data acquisition and control module converts the accessed electric signals into digital quantity to realize the functions of calculation and control;
the data acquisition and control module adopts an OVATION decentralized control system.
Preferably, the high-medium pressure cylinder-combined shaft seal overflow steam temperature measuring module is used for measuring the temperature of the high-medium pressure cylinder-combined shaft seal overflow steam, and the high-medium pressure cylinder-combined shaft seal overflow steam temperature measuring module is located at the upstream position of the joint of the high-medium pressure cylinder-combined shaft seal overflow steam collecting pipe and the shaft seal desuperheating water pipe;
the high and medium pressure combined cylinder shaft seal overflow steam temperature measuring module adopts a temperature measuring device of an E-type thermocouple or a Pt100 thermal resistor.
Preferably, the high and medium pressure cylinder and cylinder shaft seal overflow steam pressure measurement module is used for measuring the shaft seal overflow steam pressure of the high and medium pressure cylinder and cylinder shaft seal overflow steam pressure, and the high and medium pressure cylinder and cylinder shaft seal overflow steam pressure measurement module is located at the upstream position of the joint of the high and medium pressure cylinder and cylinder shaft seal overflow steam collecting pipe and the shaft seal desuperheating water pipe;
the high and medium pressure cylinder-combined shaft seal overflow steam pressure measuring module adopts an EJA or Rosemoun pressure transmitter.
Preferably, the high and medium pressure cylinder and cylinder shaft seal overflow steam pressure measurement module is used for measuring the shaft seal overflow steam pressure of the high and medium pressure cylinder and cylinder shaft seal overflow steam pressure, and the high and medium pressure cylinder and cylinder shaft seal overflow steam pressure measurement module is located at the upstream position of the joint of the high and medium pressure cylinder and cylinder shaft seal overflow steam collecting pipe and the shaft seal desuperheating water pipe;
the high and medium pressure cylinder-combined shaft seal overflow steam pressure measuring module adopts an EJA or Rosemoun pressure transmitter.
Preferably, the temperature-reducing water adjusting module is used for adjusting and controlling the temperature of steam entering the steam main pipe through the low-pressure cylinder shaft seal;
the warm water adjusting module adopts a pneumatic adjusting valve or an electric adjusting valve.
Preferably, the low-pressure cylinder shaft seal steam inlet adjusting module is used for adjusting and controlling steam pressure in a low-pressure cylinder shaft seal steam inlet main pipe, and the low-pressure cylinder shaft seal steam inlet adjusting module is located at the upstream position of the joint of a high-medium pressure cylinder shaft seal overflow steam collecting pipe and a shaft seal temperature-reducing water pipe;
the low-pressure cylinder shaft seal steam inlet adjusting module adopts a pneumatic adjusting valve or an electric adjusting valve.
Preferably, the low-pressure cylinder shaft seal steam inlet temperature measuring module and the low-pressure cylinder shaft seal steam inlet pressure measuring module are arranged on a low-pressure cylinder shaft seal steam inlet main pipe at the downstream of the joint of the low-pressure cylinder shaft seal steam inlet main pipe and the shaft seal desuperheating water pipe;
the low-pressure cylinder shaft seal steam inlet temperature measuring module is used for measuring the low-pressure cylinder shaft seal steam inlet temperature;
the low-pressure cylinder shaft seal steam inlet pressure measuring module is used for measuring the low-pressure cylinder shaft seal steam inlet pressure;
the low-pressure cylinder shaft seal steam inlet temperature measuring module is a temperature measuring device of an E-type thermocouple or a Pt100 thermal resistor;
the low-pressure cylinder shaft seal steam inlet pressure measuring module adopts an EJA or Rosemoun pressure transmitter.
Preferably, the shaft seal temperature reduction water temperature and flow module is used for measuring the flow of the shaft seal temperature reduction water;
the shaft seal desuperheating water temperature and flow module comprises a flow throttling orifice plate and a flow tester, wherein the flow throttling orifice plate is arranged on a shaft seal desuperheating water pipe at the upstream of a door of the desuperheating water adjusting module; the flow tester is connected with the flow throttling orifice plate and is used for measuring the shaft seal temperature reduction water flow;
the steam flow tester adopts an EJA or Rosemoun flow differential pressure transmitter;
the flow throttling orifice plate adopts an angle connection pressure taking or flange pressure taking standard orifice plate.
According to the low-pressure cylinder shaft seal steam flow testing system of the high-medium pressure combined cylinder steam turbine, pressure, temperature and flow of corresponding pipelines are monitored through the modules, monitoring of shaft seal overflow steam flow of the high-medium pressure combined cylinder and monitoring of steam flow supplied by the low-pressure cylinder shaft seal can be achieved, accordingly, the size change trend of a gap between a shaft seal tooth of a steam turbine shaft seal system and a rotor is supported, a basis can be provided for whether the steam turbine shaft seal needs to be maintained, operation efficiency of the steam turbine is improved, and energy consumption loss is reduced.
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 some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a low-pressure cylinder shaft seal steam flow testing system according to an embodiment of the invention.
FIG. 2 is a schematic view of the structural connection between the shaft seal steam flow testing system and the shaft seal system of the low pressure cylinder according to the embodiment of the present invention.
FIG. 3 is a schematic flow chart of a method for testing the low-pressure cylinder shaft seal steam flow according to an embodiment of the invention.
The labels in the figure are: a high and medium pressure cylinder closing shaft seal overflow steam temperature measuring module-1, a high and medium pressure cylinder closing shaft seal overflow steam pressure measuring module-2, a high and medium pressure cylinder closing shaft seal overflow steam collecting pipe-3, a desuperheating water adjusting module-4, a shaft seal desuperheating water temperature measuring module-5, a shaft seal desuperheating water pressure measuring module-6, a flow measuring instrument-7, a flow throttling orifice plate-8, a shaft seal desuperheating water pipe-9, a low pressure cylinder shaft seal admission regulating module-10, a low pressure cylinder shaft seal admission steam main pipe-11, a low pressure cylinder shaft seal admission steam temperature measuring module-12, a low pressure cylinder shaft seal admission steam pressure measuring module-13, a high and medium pressure cylinder closing front-14, a high and medium pressure cylinder-15, a medium pressure cylinder-16, a high and medium pressure cylinder closing rear shaft seal-17, a low pressure cylinder front shaft seal-18, the device comprises a first low-pressure cylinder-19, a second low-pressure cylinder-20, a low-pressure cylinder rear shaft seal-21, a collection and controller-22 and a shaft seal desuperheating water flow measuring module-23.
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.
Examples
See fig. 1 and 2.
A cylinder shaft seal steam flow testing device for a high and medium pressure combined cylinder comprises a high and medium pressure combined cylinder shaft seal overflow steam temperature measuring module 1, a high and medium pressure combined cylinder shaft seal overflow steam pressure measuring module 2, a desuperheating water adjusting module 4, a low pressure cylinder shaft seal steam inlet temperature measuring module 12, a low pressure cylinder shaft seal steam inlet pressure measuring module 13, a shaft seal desuperheating water temperature measuring module 5, a shaft seal desuperheating water pressure measuring module 6, a shaft seal desuperheating water flow measuring module and related pipelines;
the low-pressure cylinder shaft seal steam inlet main pipe 11 is connected with the shaft seal temperature reduction water pipe 9 and the high-medium pressure cylinder shaft seal overflow steam collecting pipe 3 through three-way joints;
the high-medium pressure cylinder closing shaft seal overflow steam temperature measuring module 1 is arranged on a high-medium pressure cylinder closing shaft seal overflow steam collecting pipe 3, the high-medium pressure cylinder closing shaft seal overflow steam temperature measuring module 1 is located at the upstream position of a joint of the high-medium pressure cylinder closing shaft seal overflow steam collecting pipe 3 and a shaft seal temperature reduction water pipe 9, and the high-medium pressure cylinder closing shaft seal overflow steam temperature measuring module 1 is used for measuring the temperature of high-medium pressure cylinder closing shaft seal overflow steam;
the high and medium pressure cylinder closing shaft seal overflow steam pressure measurement module 2 is arranged on a high and medium pressure cylinder closing shaft seal overflow steam collecting pipe 3, the high and medium pressure cylinder closing shaft seal overflow steam pressure measurement module 2 is located at the upstream position of a joint of the high and medium pressure cylinder closing shaft seal overflow steam collecting pipe 3 and a shaft seal temperature reduction water pipe 9, and the high and medium pressure cylinder closing shaft seal overflow steam pressure measurement module 2 is used for measuring the high and medium pressure cylinder closing shaft seal overflow steam pressure;
the temperature-reducing water adjusting module 4 is arranged on the shaft seal temperature-reducing water pipe 9, and the temperature-reducing water adjusting module 4 is used for adjusting and controlling the temperature of steam in the low-pressure cylinder shaft seal steam inlet main pipe 11;
the low-pressure cylinder shaft seal steam inlet adjusting module 10 is arranged on the high-medium pressure cylinder closing shaft seal overflow steam collecting pipe 3, the low-pressure cylinder shaft seal steam inlet adjusting module 10 is located at the upstream position of a joint of the high-medium pressure cylinder closing shaft seal overflow steam collecting pipe 3 and a shaft seal temperature reduction water pipe 9, and the low-pressure cylinder shaft seal steam inlet adjusting module 10 is used for adjusting and controlling steam pressure in a low-pressure cylinder shaft seal steam inlet main pipe 11;
the low-pressure cylinder shaft seal steam inlet temperature measuring module 12 is used for measuring the low-pressure cylinder shaft seal steam inlet temperature, the low-pressure cylinder shaft seal steam inlet temperature measuring module 12 is arranged on the low-pressure cylinder shaft seal steam inlet main pipe 11 at the downstream of the joint of the low-pressure cylinder shaft seal steam inlet main pipe 11 and the shaft seal temperature reduction water pipe 9, and the distance from the joint of the shaft seal temperature reduction water pipe 9 to the low-pressure cylinder shaft seal steam inlet main pipe 11 is more than 1.5 m;
the low-pressure cylinder shaft seal steam inlet pressure measuring module 13 is used for measuring the low-pressure cylinder shaft seal steam inlet pressure, the low-pressure cylinder shaft seal steam inlet pressure measuring module 13 is arranged on the low-pressure cylinder shaft seal steam inlet main pipe 11 at the downstream of the joint of the low-pressure cylinder shaft seal steam inlet main pipe 11 and the shaft seal temperature reduction water pipe 9, and the distance from the joint of the shaft seal temperature reduction water pipe 9 is more than 1.5 meters;
the shaft seal temperature reduction water temperature measurement module 5 is used for measuring the temperature of the shaft seal temperature reduction water, and the shaft seal temperature reduction water temperature measurement module 5 is arranged on a shaft seal temperature reduction water pipe 9 at the inlet of the temperature reduction water regulation module 4;
the shaft seal desuperheating water pressure measuring module 6 is used for measuring the shaft seal desuperheating water pressure, and the shaft seal desuperheating water pressure measuring module 6 is arranged on a shaft seal desuperheating water pipe 9 at the inlet of the desuperheating water adjusting module 4;
the shaft seal desuperheating water temperature flow device comprises a flow throttling orifice plate 8 and a flow tester 7, the shaft seal desuperheating water temperature flow device is used for measuring the flow of shaft seal desuperheating water, and the flow throttling orifice plate 8 is arranged on a shaft seal desuperheating water pipe 9 at the upstream of a door 4 of the desuperheating water adjusting module;
the high-medium pressure cylinder shaft seal overflow steam temperature measuring module 1, the low-pressure cylinder shaft seal inlet steam temperature measuring module 5 and the shaft seal temperature reduction water temperature measuring module 12 adopt E-type thermocouples or Pt100 thermal resistors, the high-medium pressure cylinder shaft seal overflow steam pressure measuring module 2, the low-pressure cylinder shaft seal inlet steam pressure measuring module 3 and the shaft seal temperature reduction water pressure measuring module 13 adopt EJA or Rosemoun series pressure transmitters, and the steam flow tester 7 adopts EJA or Rosemoun series flow differential pressure transmitters to respectively realize the conversion of temperature, pressure and flow signals to electric signals; the data acquisition and control unit 22 converts the accessed electric signals into digital quantities to realize the functions of calculation and control;
the flow throttling orifice plate 8 adopts an angle connection pressure taking or flange pressure taking standard orifice plate;
the data acquisition and control device 22 is electrically connected with the high and medium pressure cylinder combination shaft seal overflow steam temperature measurement module 1, the desuperheating water regulation module 4, the low pressure cylinder shaft seal steam inlet regulation module 10, the low pressure cylinder shaft seal steam inlet temperature measurement module 5, the shaft seal desuperheating water temperature measurement module 12, the high and medium pressure cylinder combination shaft seal overflow steam pressure measurement module 2, the low pressure cylinder shaft seal steam inlet pressure measurement module 6, the shaft seal desuperheating water pressure measurement module 13 and the shaft seal desuperheating water flow measurement module 7 respectively.
The data acquisition and control device 22 is connected with the desuperheating water adjusting module 4 and the low-pressure cylinder shaft seal steam inlet adjusting module 10 and is used for controlling the opening degree of the desuperheating water adjusting module 4 and the low-pressure cylinder shaft seal steam inlet adjusting module 10.
The data acquisition and control unit 22 adopts an OVATION decentralized control system or other similar functional systems;
the temperature-reducing water adjusting module 4 adopts a pneumatic adjusting valve or an electric adjusting valve.
A certain steam turbine is a subcritical, once intermediate reheating, two-cylinder two-steam-exhaust and condensing steam turbine, and the model is as follows: n300-16.7/538/538, wherein the high-pressure cylinder and the intermediate-pressure cylinder adopt a cylinder combination form; the main design parameters of the unit are shown in table 1 below, and all references to pressure (or vacuum) are absolute pressures.
TABLE 1 Main design parameters of the unit
See fig. 3.
A low-pressure cylinder shaft seal steam flow testing method of a high-medium pressure cylinder combined steam turbine is characterized in that a low-pressure cylinder shaft seal steam flow testing device is used for testing;
s1: the opening degree of the low-pressure cylinder shaft seal steam inlet regulating valve is regulated to stabilize the pressure of the low-pressure cylinder shaft seal steam inlet main pipe to 25 kPa;
after the temperature, pressure, flow, regulating valve and other related devices are installed, the tester is verified to be qualified, and the regulating valve is flexible and reliable in action;
the steam turbine generator unit normally operates, the load of the steam turbine generator unit is gradually increased to the rated load working condition of the generator, and a steam turbine shaft seal system realizes self sealing;
adjusting the opening of the steam inlet adjusting valve to enable a low-pressure cylinder shaft seal steam inlet pressure measuring device for measuring the steam pressure in the low-pressure cylinder shaft seal steam inlet main pipe to display 25 kPa; the steam inlet regulating valve is automatically switched on, so that the display value of the low-pressure cylinder shaft seal steam inlet pressure measuring device is stabilized at 25 kPa.
S2: stabilizing the steam temperature of a steam inlet main pipe of the low-pressure cylinder shaft seal by adjusting a temperature-reducing water adjusting valve of the testing device, and acquiring first-time data;
adjusting the opening of a temperature-reducing water adjusting valve to ensure that the temperature of steam sealed in the steam main pipe by the low-pressure cylinder shaft is stabilized at t ℃; recording data displayed by a high and medium pressure cylinder and cylinder shaft seal overflow steam temperature measuring device, a high and medium pressure cylinder and cylinder shaft seal overflow steam pressure measuring device, a low pressure cylinder and cylinder shaft seal inlet steam temperature measuring device, a low pressure cylinder and cylinder shaft seal inlet steam pressure measuring device, a shaft seal desuperheating water temperature measuring device, a shaft seal desuperheating water pressure measuring device and a flow tester by continuously using the frequency of which the period is 10s for 10 min;
the first-time data acquisition is arithmetically averaged and represented by symbols as follows: the high and medium pressure combined cylinder shaft seal overflow steam temperature T1, the high and medium pressure combined cylinder shaft seal overflow steam pressure P1, the shaft seal temperature T2, the shaft seal temperature P2, the shaft seal temperature Q2, the low pressure cylinder shaft seal steam inlet temperature T3 and the low pressure cylinder shaft seal steam inlet pressure P3.
S3: adjusting the opening of a temperature-reducing water adjusting valve of the testing device to reduce the steam temperature of a steam inlet main pipe of the low-pressure cylinder shaft seal, and acquiring secondary data;
adjusting the opening of a temperature-reducing water adjusting valve to ensure that the temperature of steam sealed in the steam main pipe by the low-pressure cylinder shaft is stabilized at t-10 ℃; recording data displayed by a high and medium pressure cylinder and cylinder shaft seal overflow steam temperature measuring device, a high and medium pressure cylinder and cylinder shaft seal overflow steam pressure measuring device, a low pressure cylinder and cylinder shaft seal inlet steam temperature measuring device, a low pressure cylinder and cylinder shaft seal inlet steam pressure measuring device, a shaft seal desuperheating water temperature measuring device, a shaft seal desuperheating water pressure measuring device and a flow tester by continuously using the frequency of which the period is 10s for 10 min;
and the second-time data acquisition is arithmetically averaged and represented by symbols as follows: high and medium pressure combined cylinder shaft seal overflow steam temperature T1 ', high and medium pressure combined cylinder shaft seal overflow steam pressure P1 ', shaft seal temperature reduction water temperature T2 ', shaft seal temperature reduction water pressure P2 ', shaft seal temperature reduction water flow Q2 ', low pressure cylinder shaft seal steam inlet temperature T3 ' and low pressure cylinder shaft seal steam inlet pressure P3 '.
S4: and inputting the first data and the second data into a data acquisition and control device for calculation to obtain the shaft seal steam flow.
And inputting the pressure and the flow measured by the first data and the second data into a data acquisition and control device, calculating the enthalpy value of the same pipeline in real time by the acquisition and control device through an IAPWS IF97 water and water vapor calculation formula, and calculating the shaft seal vapor flow by the enthalpy value and the measured flow according to the energy conservation law of the data acquisition and control device.
Setting a calculation formula in the data acquisition and control device, wherein the calculation formula comprises an IAPWS IF97 water and water vapor calculation formula and an energy conservation law;
the enthalpy value H1 is calculated in real time according to the H1 and the P1 according to the IAPWS IF97 water and water vapor calculation formula, wherein the temperature of shaft seal overflow steam of the high and medium pressure cylinders is T1, and the shaft seal overflow steam pressure of the high and medium pressure cylinders is P1; the enthalpy value H2 is calculated in real time according to the calculation formulas of the shaft seal temperature-reducing water temperature T2, the shaft seal temperature-reducing water pressure P2 and the shaft seal temperature-reducing water flow Q2 according to T2 and P2 and IAPWS IF97 water and water vapor; the enthalpy value H3 is calculated in real time according to the low-pressure cylinder shaft seal steam inlet temperature T3 and the low-pressure cylinder shaft seal steam inlet pressure P3 according to the calculation formulas of the IAPWS IF97 water and the water vapor according to T3 and P3;
the enthalpy value H1 ' is calculated in real time according to the calculation formulas of the water and the water vapor of IAPWS IF97 according to T1 ' and P1 ', and the temperature T1 ' of the shaft seal overflow steam of the high and medium pressure cylinder and the shaft seal overflow steam pressure P1 ' of the high and medium pressure cylinder; shaft seal temperature reduction water temperature T2 ', shaft seal temperature reduction water pressure P2', shaft seal temperature reduction water flow Q2 ', and enthalpy value H2' is calculated in real time according to the calculation formulas of IAPWWS IF97 water and water vapor according to T2 'and P2'; the enthalpy value H3 ' is calculated in real time according to the water and steam calculation formulas of IAPWS IF97 according to T3 ' and P3 ', and the steam inlet temperature T3 ' and the steam inlet pressure P3 ' of the low-pressure cylinder shaft seal;
the first data is obtained according to the energy conservation and balance principle:
Q1×H1+Q2×H2＝(Q1+Q2)×H3+qs (1)
the second time data is obtained according to the energy conservation and balance principle:
Q1×H1'+Q2'×H2'＝(Q1+Q2')×H3'+qs (2)
combining two equations to obtain the steam flow of the shaft seal overflow steam collecting pipe of the high and medium pressure combined cylinder as Q1, and eliminating QsThe following can be obtained:
Q1＝[Q2×(H3-H2)-Q2'×(H3'-H2')]/[(H1-H3)-(H1'-H3')] (3)
the test and calculation data table is shown in table 2, and according to the data in table 2, the steam flow of the high-medium pressure combined cylinder shaft seal overflow steam collecting pipe 3 can be calculated according to the formula (3) to be Q1, that is, the steam supply flow of the low-pressure cylinder shaft seal into the steam main pipe 11 is 9.7 t/h.
TABLE 2 test and calculation data sheet
In the embodiment of the invention, the testing device is arranged on the steam turbine shaft seal system of the engine unit, the shaft seal temperature reduction water pipe is adjusted through the regulating valve, the pressure measuring module, the flow measuring module and the temperature measuring module respectively measure the pressure, the flow and the temperature, and the steam supply flow of the low-pressure cylinder shaft seal is calculated through the pressure, the flow and the temperature, so that the size of a gap between the shaft seal teeth and the rotor can be judged according to the change of the steam flow of the shaft seal.
In the embodiment of the invention, a system is arranged on a steam turbine shaft seal system of an engine unit, the pressure, the flow and the temperature of corresponding pipelines are respectively measured by a pressure measurer, a flow measurer and a temperature measurer, and the measured pressure, flow and temperature data are summarized to the steam flow supplied by the low-pressure cylinder shaft seal calculated by a data acquisition and control module, so that the size of a gap between a shaft seal tooth and a rotor can be judged according to the change of the shaft seal steam flow.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by instructions associated with hardware via a program, which may be stored in a computer-readable storage medium, and the storage medium may include: a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic or optical disk, or the like.
In addition, the above embodiments of the present invention are described in detail, and the principle and the implementation manner of the present invention should be described herein by using specific examples, and the above description of the embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A low-pressure cylinder shaft seal steam flow testing system of a high-medium pressure cylinder-combined steam turbine is characterized by comprising a high-medium pressure cylinder-combined shaft seal overflow steam temperature measuring module, a high-medium pressure cylinder-combined shaft seal overflow steam pressure measuring module, a desuperheating water adjusting module, a low-pressure cylinder shaft seal steam inlet temperature measuring module, a low-pressure cylinder shaft seal steam inlet pressure measuring module, a shaft seal desuperheating water temperature measuring module, a shaft seal desuperheating water pressure measuring module, a shaft seal desuperheating water flow measuring module and a data acquisition and control module;
the data acquisition and control module is respectively electrically connected with the high-medium pressure cylinder closing shaft seal overflow steam temperature measurement module, the low-pressure cylinder shaft seal inlet steam temperature measurement module, the shaft seal temperature reduction water temperature measurement module, the high-medium pressure cylinder closing shaft seal overflow steam pressure measurement module, the temperature reduction water regulation module, the low-pressure cylinder shaft seal inlet steam pressure measurement module, the shaft seal temperature reduction water pressure measurement module and the shaft seal temperature reduction water flow measurement module.
2. The low-pressure cylinder shaft seal steam flow test system of claim 1, further comprising a shaft seal temperature reduction water pipe, a low-pressure cylinder shaft seal steam inlet main pipe and a high-medium pressure combined cylinder shaft seal overflow steam manifold;
the low-pressure cylinder shaft seal steam inlet main pipe is connected with the shaft seal temperature reduction water pipe and the high-medium pressure cylinder shaft seal overflow steam collecting pipe;
the high-medium pressure cylinder and cylinder combined shaft seal overflow steam temperature measuring module, the high-medium pressure cylinder and cylinder combined shaft seal overflow steam pressure measuring module and the low-pressure cylinder and cylinder shaft seal inlet steam adjusting module are arranged on the high-medium pressure cylinder and cylinder combined shaft seal overflow steam collecting pipe;
the shaft seal desuperheating water flow measuring module, the shaft seal desuperheating water pressure measuring module, the shaft seal desuperheating water temperature measuring module and the desuperheating water adjusting module are arranged on the shaft seal desuperheating water pipe;
the low-pressure cylinder shaft seal steam inlet main pipe is provided with the low-pressure cylinder shaft seal steam inlet pressure measuring module and the low-pressure cylinder shaft seal steam inlet temperature measuring module.
3. The low-pressure cylinder shaft seal steam flow testing system of claim 1, wherein the data acquisition and control module converts the accessed electrical signals into digital quantities to achieve calculation and control functions;
the data acquisition and control module adopts an OVATION decentralized control system.
4. The low-pressure cylinder shaft seal steam flow testing system of claim 1, wherein the high-medium pressure combined cylinder shaft seal overflow steam temperature measuring module is used for measuring the high-medium pressure combined cylinder shaft seal overflow steam temperature, and the high-medium pressure combined cylinder shaft seal overflow steam temperature measuring module is located at an upstream position of a joint of the high-medium pressure combined cylinder shaft seal overflow steam collecting pipe and the shaft seal temperature reduction water pipe;
the high and medium pressure combined cylinder shaft seal overflow steam temperature measuring module adopts a temperature measuring device of an E-type thermocouple or a Pt100 thermal resistor.
5. The low-pressure cylinder shaft seal steam flow test system of claim 1, wherein the high and medium pressure combined cylinder shaft seal overflow steam pressure measurement module is used for measuring the high and medium pressure combined cylinder shaft seal overflow steam pressure, and the high and medium pressure combined cylinder shaft seal overflow steam pressure measurement module is located at an upstream position of a joint of the high and medium pressure combined cylinder shaft seal overflow steam manifold and the shaft seal desuperheating water pipe;
the high and medium pressure cylinder-combined shaft seal overflow steam pressure measuring module adopts an EJA or Rosemoun pressure transmitter.
6. The low-pressure cylinder shaft seal steam flow test system of claim 1, wherein the high and medium pressure combined cylinder shaft seal overflow steam pressure measurement module is used for measuring the high and medium pressure combined cylinder shaft seal overflow steam pressure, and the high and medium pressure combined cylinder shaft seal overflow steam pressure measurement module is located at an upstream position of a joint of the high and medium pressure combined cylinder shaft seal overflow steam manifold and the shaft seal desuperheating water pipe;
the high and medium pressure cylinder-combined shaft seal overflow steam pressure measuring module adopts an EJA or Rosemoun pressure transmitter.
7. The low pressure cylinder shaft seal steam flow test system of claim 1, wherein the desuperheating water adjusting module is used for adjusting and controlling the steam temperature in the low pressure cylinder shaft seal steam main pipe;
the warm water adjusting module adopts a pneumatic adjusting valve or an electric adjusting valve.
8. The low-pressure cylinder shaft seal steam flow testing system of claim 1, wherein the low-pressure cylinder shaft seal steam inlet adjusting module is used for adjusting and controlling steam pressure in a low-pressure cylinder shaft seal steam inlet main pipe, and the low-pressure cylinder shaft seal steam inlet adjusting module is located at an upstream position of a joint of a high-medium pressure cylinder shaft seal overflow steam manifold and a shaft seal desuperheating water pipe;
the low-pressure cylinder shaft seal steam inlet adjusting module adopts a pneumatic adjusting valve or an electric adjusting valve.
9. The low-pressure cylinder shaft seal steam flow testing system of claim 1, wherein the low-pressure cylinder shaft seal steam inlet temperature measuring module and the low-pressure cylinder shaft seal steam inlet pressure measuring module are arranged on a low-pressure cylinder shaft seal steam inlet main pipe downstream of a joint of the low-pressure cylinder shaft seal steam inlet main pipe and the shaft seal desuperheating water pipe;
the low-pressure cylinder shaft seal steam inlet temperature measuring module is used for measuring the low-pressure cylinder shaft seal steam inlet temperature;
the low-pressure cylinder shaft seal steam inlet pressure measuring module is used for measuring the low-pressure cylinder shaft seal steam inlet pressure;
the low-pressure cylinder shaft seal steam inlet temperature measuring module is a temperature measuring device of an E-type thermocouple or a Pt100 thermal resistor;
the low-pressure cylinder shaft seal steam inlet pressure measuring module adopts an EJA or Rosemoun pressure transmitter.
10. The low pressure cylinder shaft seal steam flow test system of claim 1, wherein the shaft seal desuperheating water temperature flow module is used for measuring shaft seal desuperheating water flow;
the shaft seal desuperheating water temperature and flow module comprises a flow throttling orifice plate and a flow tester, wherein the flow throttling orifice plate is arranged on a shaft seal desuperheating water pipe at the upstream of a door of the desuperheating water adjusting module; the flow tester is connected with the flow throttling orifice plate and is used for measuring the shaft seal temperature reduction water flow;
the steam flow tester adopts an EJA or Rosemoun flow differential pressure transmitter;
the flow throttling orifice plate adopts an angle connection pressure taking or flange pressure taking standard orifice plate.
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| CN202110427938.1A CN113250761A (en) | 2021-04-21 | 2021-04-21 | Low-pressure cylinder shaft seal steam flow testing system of high-medium pressure cylinder-combined steam turbine |
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Application publication date: 20210813 |