CN113236379A - Low-pressure cylinder shaft seal steam flow testing device of high-medium pressure cylinder closing steam turbine - Google Patents
Low-pressure cylinder shaft seal steam flow testing device of high-medium pressure cylinder closing 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
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
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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
- F01D11/06—Control thereof
Abstract
The invention discloses a low-pressure cylinder shaft seal steam flow testing device of a high-medium pressure combined cylinder steam turbine, which comprises a shaft seal temperature reduction module, a steam outlet temperature and pressure detection module, a steam inlet temperature and pressure detection module and a steam inlet regulating valve; the shaft seal temperature reduction module is connected with a shaft seal overflow steam collecting pipe through a three-way joint, and the shaft seal overflow steam collecting pipe is divided into a high-medium pressure cylinder-combined shaft seal overflow steam collecting pipe and a low-pressure cylinder shaft seal inlet steam main pipe through the three-way joint; the high-medium pressure cylinder closing shaft seal overflow steam collecting pipe is provided with a steam outlet temperature and pressure detection module and a steam inlet adjusting valve, and the low-pressure cylinder shaft seal steam inlet main pipe is provided with a steam inlet temperature and pressure detection module. The invention measures the flow, temperature and pressure of the device, and can realize the monitoring of the flow of the shaft seal overflow steam of the high and medium pressure-fitting cylinder, thereby supporting and holding the variation trend of the size of the gap between the shaft seal tooth and the rotor of the steam turbine shaft seal system.
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 testing device 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.
A throttle orifice flow measuring device is installed on a steam pipeline for measuring the steam flow of a shaft seal pipeline, however, the testing device is not installed on a unit which is in service operation currently.
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 device of a high-medium pressure combined cylinder steam turbine, which is provided with a flow tester, a temperature measurer and a pressure measurer, measures the flow, the temperature and the pressure of the device, and realizes the detection of the shaft seal overflow steam flow of the high-medium pressure combined cylinder, thereby supporting and holding the change trend of the size of the gap between the shaft seal tooth and the rotor of the steam turbine shaft seal system.
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 testing device for a high-and-medium-pressure combined cylinder steam turbine, where the device includes a shaft seal temperature reduction module, a steam outlet temperature and pressure detection module, a steam inlet temperature and pressure detection module, and a steam inlet regulating valve;
the shaft seal temperature reduction module is connected with a shaft seal overflow steam collecting pipe through a three-way joint, and the shaft seal overflow steam collecting pipe is divided into a high-medium pressure cylinder-combined shaft seal overflow steam collecting pipe and a low-pressure cylinder shaft seal inlet steam main pipe through the three-way joint;
the high-medium pressure cylinder closing shaft seal overflow steam collecting pipe is provided with a steam outlet temperature and pressure detection module and a steam inlet adjusting valve, and the low-pressure cylinder shaft seal steam inlet main pipe is provided with a steam inlet temperature and pressure detection module.
Preferably, the shaft seal temperature reduction module comprises a shaft seal temperature reduction water temperature measurer, a shaft seal temperature reduction water pressure measurer, a shaft seal temperature reduction water flow measurer, a temperature reduction water regulating valve and a shaft seal temperature reduction water pipe;
the shaft seal temperature-reducing water pipe is provided with the shaft seal temperature-reducing water temperature measurer, the shaft seal temperature-reducing water pressure measurer, the shaft seal temperature-reducing water flow measurer and the temperature-reducing water regulating valve, wherein the measuring ends of the temperature-reducing water temperature measurer and the shaft seal temperature-reducing water pressure measurer are arranged in the pipe of the shaft seal temperature-reducing water pipe.
Preferably, the device further comprises a data acquisition and controller, and the data acquisition and controller is electrically connected with the steam outlet temperature and pressure detection module, the steam inlet temperature and pressure detection module, the shaft seal desuperheating water temperature measurer, the shaft seal desuperheating water pressure measurer and the shaft seal desuperheating water flow measurer respectively.
Preferably, the data acquisition and control device adopts an OVATION decentralized control system.
Preferably, the steam outlet temperature and pressure detection module comprises a high and medium pressure combined cylinder shaft seal overflow steam temperature measurer and a high and medium pressure combined cylinder shaft seal overflow steam pressure measurer;
the high-medium pressure cylinder and cylinder shaft seal overflow steam temperature measurer and the high-medium pressure cylinder and cylinder shaft seal overflow steam pressure measurer are arranged at the upstream of the joint of the high-medium pressure cylinder and cylinder shaft seal overflow steam manifold and the shaft seal temperature reduction water pipe, and the measuring ends of the high-medium pressure cylinder and cylinder shaft seal overflow steam temperature measurer and the high-medium pressure cylinder and cylinder shaft seal overflow steam pressure measurer are arranged in the pipe of the medium-medium pressure cylinder and cylinder shaft seal overflow steam manifold.
Preferably, the steam inlet temperature and pressure detection module comprises a low-pressure cylinder shaft seal steam inlet temperature measurer and a low-pressure cylinder shaft seal steam inlet pressure measurer;
the low-pressure cylinder shaft seal steam inlet temperature measurer and the low-pressure cylinder shaft seal steam inlet pressure measurer are arranged on a low-pressure cylinder shaft seal steam inlet main pipe at the downstream of a joint of the low-pressure cylinder shaft seal steam inlet main pipe and the shaft seal temperature-reducing water pipe, and measuring ends of the low-pressure cylinder shaft seal steam inlet temperature measurer and the low-pressure cylinder shaft seal steam inlet pressure measurer are arranged in a pipe of the low-pressure cylinder shaft seal steam inlet main pipe.
Preferably, the shaft seal desuperheating water temperature flow meter comprises a flow throttling orifice plate and a steam supply flow tester, the flow throttling orifice plate is arranged on the shaft seal desuperheating water pipe at the upstream of the desuperheating water regulating valve, and the steam supply flow tester is arranged on the flow throttling orifice plate.
Preferably, the flow throttling orifice plate adopts an angle connection pressure taking or flange pressure taking standard orifice plate.
Preferably, the temperature-reducing water regulating valve is a pneumatic regulating valve or an electric regulating valve.
Preferably, the high and medium pressure combined cylinder shaft seal overflow steam temperature measuring instrument, the low pressure cylinder shaft seal inlet steam temperature measuring instrument and the shaft seal desuperheating water temperature measuring instrument adopt temperature measuring instruments of an E-type thermocouple or a Pt100 thermal resistor.
Preferably, the temperature-reducing water regulating valve is a pneumatic regulating valve or an electric regulating valve.
The low-pressure cylinder shaft seal steam flow testing device of the high-medium pressure combined cylinder steam turbine provided by the invention has the advantages that the number of testing instruments and meters is small, the installation difficulty is avoided, the detection of high-medium pressure combined cylinder shaft seal overflow steam flow and low-pressure cylinder shaft seal steam supply flow can be realized by installing the device on an original shaft seal system, so that the size change trend of a gap between a shaft seal tooth and a rotor of the steam turbine shaft seal system is supported, a basis can be provided for whether the steam turbine shaft seal needs to be maintained, the operation efficiency of the steam turbine is improved, and the 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 device according to an embodiment of the invention.
Fig. 2 is a schematic view of a connection structure of the low-pressure cylinder shaft seal steam flow testing device and the steam turbine generator unit according to the embodiment of the invention.
Fig. 3 is a schematic structural connection diagram of the acquisition and control unit according to the embodiment of the present invention.
FIG. 4 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 measurer-1, a high and medium pressure cylinder closing shaft seal overflow steam pressure measurer-2, a high and medium pressure cylinder closing shaft seal overflow steam collecting pipe-3, a desuperheating water regulating valve-4, a shaft seal desuperheating water temperature measurer-5, a shaft seal desuperheating water pressure measurer-6, a flow tester-7, a flow throttling orifice plate-8, a shaft seal desuperheating water pipe-9, a steam inlet regulating valve-10, a low pressure cylinder shaft seal steam inlet main pipe-11, a low pressure cylinder shaft seal steam inlet temperature measurer-12, a low pressure cylinder shaft seal steam inlet pressure measurer-13, a high and medium pressure cylinder closing front shaft seal-14, a high and medium pressure cylinder-15, a medium pressure cylinder-16, a high and medium pressure cylinder closing rear cylinder-17, a low pressure cylinder front shaft seal-18 and a No. I low pressure cylinder-19, a second low pressure cylinder-20, a low pressure cylinder rear shaft seal-21, an acquisition and controller-22 and a shaft seal temperature-reducing water flow measurer-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, 2 and 3.
A cylinder shaft seal steam flow testing device for a high and medium pressure combined cylinder comprises a shaft seal temperature reduction module, a steam outlet temperature and pressure detection module, a steam inlet temperature and pressure detection module and a steam inlet regulating valve;
the steam outlet temperature and pressure detection module comprises a high and medium pressure cylinder combined shaft seal overflow steam temperature measurer 1 and a high and medium pressure cylinder combined shaft seal overflow steam pressure measurer 2; the steam inlet temperature and pressure detection module comprises a low-pressure cylinder shaft seal steam inlet temperature measurer 12 and a low-pressure cylinder shaft seal steam inlet pressure measurer 13; the shaft seal temperature reduction module comprises a temperature reduction water regulating valve 4, a shaft seal temperature reduction water temperature measurer 5, a shaft seal temperature reduction water pressure measurer 6 and a shaft seal temperature reduction water flow measurer;
dividing the shaft seal overflow steam collecting pipe into a high-medium pressure cylinder-combined shaft seal overflow steam collecting pipe 3 and a low-pressure cylinder shaft seal inlet steam main pipe 11; the shaft seal temperature reduction water pipe 9 is connected with a low-pressure cylinder shaft seal steam inlet main pipe 11 and a high-medium pressure cylinder closing shaft seal overflow steam collecting pipe 3 through a three-way joint;
the high-medium pressure cylinder-closing shaft seal overflow steam temperature measurer 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 measurer 1 is located at an 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 measurer 1 is used for measuring the temperature of the high-medium pressure cylinder-closing shaft seal overflow steam;
the high and medium pressure cylinder and cylinder combined shaft seal overflow steam pressure measurer 2 is arranged on a high and medium pressure cylinder and cylinder combined shaft seal overflow steam collecting pipe 3, the high and medium pressure cylinder and cylinder combined shaft seal overflow steam pressure measurer 2 is located at an upstream position of a joint of the high and medium pressure cylinder and cylinder combined shaft seal overflow steam collecting pipe 3 and a shaft seal temperature reduction water pipe 9, and the high and medium pressure cylinder and cylinder combined shaft seal overflow steam pressure measurer 2 is used for measuring the high and medium pressure cylinder and cylinder combined shaft seal overflow steam pressure;
the temperature-reducing water regulating valve 4 is arranged on the shaft seal temperature-reducing water pipe 9, and the temperature-reducing water regulating valve 4 is used for regulating and controlling the temperature of steam in the low-pressure cylinder shaft seal steam inlet main pipe 11;
the steam inlet regulating valve 10 is arranged on the high and medium pressure cylinder combination shaft seal overflow steam collecting pipe 3, the steam inlet regulating valve 10 is positioned at the upstream position of the joint of the high and medium pressure cylinder combination shaft seal overflow steam collecting pipe 3 and the shaft seal temperature reduction water pipe 9, and the steam inlet regulating valve 10 is used for regulating and controlling the steam pressure in the low pressure cylinder shaft seal steam inlet main pipe 11;
the low-pressure cylinder shaft seal steam inlet temperature measurer 12 is used for measuring the low-pressure cylinder shaft seal steam inlet temperature, the low-pressure cylinder shaft seal steam inlet temperature measurer 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 measurer 13 is used for measuring the low-pressure cylinder shaft seal steam inlet pressure, the low-pressure cylinder shaft seal steam inlet pressure measurer 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 to the low-pressure cylinder shaft seal steam inlet main pipe 11 is more than 1.5 m;
the shaft seal temperature-reducing water temperature measurer 5 is used for measuring the temperature of the shaft seal temperature-reducing water, and the shaft seal temperature-reducing water temperature measurer 5 is arranged on a shaft seal temperature-reducing water pipe 9 at the inlet of the temperature-reducing water regulating valve 4;
the shaft seal desuperheating water pressure measurer 6 is used for measuring the shaft seal desuperheating water pressure, and the shaft seal desuperheating water pressure measurer 6 is arranged on a shaft seal desuperheating water pipe 9 at the inlet of the desuperheating water regulating valve 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 regulating valve;
the high and medium pressure cylinder shaft seal overflow steam temperature measurer 1, the low pressure cylinder shaft seal steam inlet temperature measurer 5 and the shaft seal temperature reduction water temperature measurer 12 adopt E-type thermocouples or Pt100 thermal resistors, the high and medium pressure cylinder shaft seal overflow steam pressure measurer 2, the low pressure cylinder shaft seal steam inlet pressure measurer 3 and the shaft seal temperature reduction water pressure measurer 13 adopt EJA or Rosemoun series pressure transmitters, and the steam flow tester 7 adopts EJA or Rosemoun series flow differential pressure transmitters, so that the conversion of temperature, pressure and flow signals to electric signals is respectively realized; 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 combined cylinder shaft seal overflow steam temperature measurer 1, the desuperheating water regulating valve 4, the steam inlet regulating valve 10, the low pressure cylinder shaft seal steam inlet temperature measurer 5, the shaft seal desuperheating water temperature measurer 12, the high and medium pressure combined cylinder shaft seal overflow steam pressure measurer 2, the low pressure cylinder shaft seal steam inlet pressure measurer 6, the shaft seal desuperheating water pressure measurer 13 and the shaft seal desuperheating water flow measurer 7 respectively.
The data acquisition and control device 22 is connected with the temperature-reducing water regulating valve 4 and the steam inlet regulating valve 10 and is used for controlling the opening degrees of the temperature-reducing water regulating valve 4 and the steam inlet regulating valve 10.
The data acquisition and control unit 22 adopts an OVATION decentralized control system or other similar functional systems;
the temperature-reducing water regulating valve 4 adopts a pneumatic regulating valve or an electric regulating 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. 4.
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, a testing device is arranged on a steam turbine shaft seal system of an engine unit, an externally-connected shaft seal desuperheating water pipe adjusts the steam flow of a shaft seal overflow steam collecting pipe, meanwhile, a pressure measurer, a flow measurer and a temperature measurer respectively measure the pressure, the flow and the temperature, and the steam supply flow of the low-pressure cylinder shaft seal is calculated through a data acquisition and controller, 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: read Only Memory (ROM), Random Access Memory (RAM), magnetic or optical disks, and 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 device of a high-medium pressure combined cylinder steam turbine is characterized by comprising a shaft seal temperature reduction module, a steam outlet temperature and pressure detection module, a steam inlet temperature and pressure detection module and a steam inlet regulating valve;
the shaft seal temperature reduction module is connected with a shaft seal overflow steam collecting pipe through a three-way joint, and the shaft seal overflow steam collecting pipe is divided into a high-medium pressure cylinder-combined shaft seal overflow steam collecting pipe and a low-pressure cylinder shaft seal inlet steam main pipe through the three-way joint;
the high-medium pressure cylinder closing shaft seal overflow steam collecting pipe is provided with a steam outlet temperature and pressure detection module and a steam inlet adjusting valve, and the low-pressure cylinder shaft seal steam inlet main pipe is provided with a steam inlet temperature and pressure detection module.
2. The low-pressure cylinder shaft seal steam flow testing device of claim 1, wherein the shaft seal temperature reduction module comprises a shaft seal temperature reduction water temperature measurer, a shaft seal temperature reduction water pressure measurer, a shaft seal temperature reduction water flow measurer, a temperature reduction water regulating valve and a shaft seal temperature reduction water pipe;
the shaft seal temperature-reducing water pipe is provided with the shaft seal temperature-reducing water temperature measurer, the shaft seal temperature-reducing water pressure measurer, the shaft seal temperature-reducing water flow measurer and the temperature-reducing water regulating valve, wherein the measuring ends of the temperature-reducing water temperature measurer and the shaft seal temperature-reducing water pressure measurer are arranged in the pipe of the shaft seal temperature-reducing water pipe.
3. The low-pressure cylinder shaft seal steam flow testing device of claim 1, further comprising a data acquisition and controller, wherein the data acquisition and controller is electrically connected to the steam outlet temperature and pressure detection module, the steam inlet temperature and pressure detection module, the shaft seal desuperheating water temperature measurer, the shaft seal desuperheating water pressure measurer, and the shaft seal desuperheating water flow measurer, respectively.
4. The low pressure cylinder shaft seal steam flow test device of claim 3, wherein the data acquisition and control unit employs an OVATION decentralized control system.
5. The low-pressure cylinder shaft seal steam flow testing device as claimed in claim 1, wherein the steam outlet temperature and pressure detection module comprises a high and medium pressure combined cylinder shaft seal overflow steam temperature measurer and a high and medium pressure combined cylinder shaft seal overflow steam pressure measurer;
the high-medium pressure cylinder and cylinder shaft seal overflow steam temperature measurer and the high-medium pressure cylinder and cylinder shaft seal overflow steam pressure measurer are arranged at the upstream of the joint of the high-medium pressure cylinder and cylinder shaft seal overflow steam manifold and the shaft seal temperature reduction water pipe, and the measuring ends of the high-medium pressure cylinder and cylinder shaft seal overflow steam temperature measurer and the high-medium pressure cylinder and cylinder shaft seal overflow steam pressure measurer are arranged in the pipe of the medium-medium pressure cylinder and cylinder shaft seal overflow steam manifold.
6. The low-pressure cylinder shaft seal steam flow testing device as claimed in claim 1, wherein the steam inlet temperature and pressure detection module comprises a low-pressure cylinder shaft seal steam inlet temperature measurer, a low-pressure cylinder shaft seal steam inlet pressure measurer;
the low-pressure cylinder shaft seal steam inlet temperature measurer and the low-pressure cylinder shaft seal steam inlet pressure measurer are arranged on a low-pressure cylinder shaft seal steam inlet main pipe at the downstream of a joint of the low-pressure cylinder shaft seal steam inlet main pipe and the shaft seal temperature-reducing water pipe, and measuring ends of the low-pressure cylinder shaft seal steam inlet temperature measurer and the low-pressure cylinder shaft seal steam inlet pressure measurer are arranged in a pipe of the low-pressure cylinder shaft seal steam inlet main pipe.
7. The low pressure cylinder shaft seal steam flow testing device of claim 2, wherein the shaft seal desuperheating water temperature flow meter comprises a flow orifice plate and a steam supply flow tester, the flow orifice plate is arranged on the shaft seal desuperheating water pipe upstream of the desuperheating water regulating valve, and the steam supply flow tester is arranged on the flow orifice plate.
8. The low-pressure cylinder shaft seal steam flow testing device as claimed in claim 7, wherein the flow restriction orifice adopts an angle joint pressure taking or flange pressure taking standard orifice.
9. The low-pressure cylinder shaft seal steam flow testing device of claim 2, wherein the temperature-reducing water regulating valve is a pneumatic regulating valve or an electric regulating valve.
10. The low-pressure cylinder shaft seal steam flow testing device of claim 2, wherein the high-medium pressure combined cylinder shaft seal overflow steam temperature measurer, the low-pressure cylinder shaft seal steam inlet temperature measurer and the shaft seal desuperheating water temperature measurer adopt temperature measurers of an E-type thermocouple or a Pt100 thermal resistor.
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| CN202110427712.1A CN113236379A (en) | 2021-04-21 | 2021-04-21 | Low-pressure cylinder shaft seal steam flow testing device of high-medium pressure cylinder closing steam turbine |
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Application publication date: 20210810 |