CN110926643A - Condensate supercooling degree on-line monitoring device and method for condensing steam turbine unit - Google Patents
Condensate supercooling degree on-line monitoring device and method for condensing steam turbine unit Download PDFInfo
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- CN110926643A CN110926643A CN201911295206.0A CN201911295206A CN110926643A CN 110926643 A CN110926643 A CN 110926643A CN 201911295206 A CN201911295206 A CN 201911295206A CN 110926643 A CN110926643 A CN 110926643A
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- 238000004781 supercooling Methods 0.000 title claims abstract description 47
- 238000012806 monitoring device Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 73
- 238000012544 monitoring process Methods 0.000 claims abstract description 15
- 229910001220 stainless steel Inorganic materials 0.000 claims description 35
- 239000010935 stainless steel Substances 0.000 claims description 35
- 238000005070 sampling Methods 0.000 claims description 16
- 238000009833 condensation Methods 0.000 claims description 13
- 230000005494 condensation Effects 0.000 claims description 13
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 6
- 229910052697 platinum Inorganic materials 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 2
- 230000001276 controlling effect Effects 0.000 abstract description 4
- 238000001816 cooling Methods 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 230000001105 regulatory effect Effects 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 238000004364 calculation method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000014121 butter Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
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- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/0092—Pressure sensor associated with other sensors, e.g. for measuring acceleration or temperature
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Abstract
The invention discloses an on-line monitoring device and method for condensate supercooling degree of a condensing steam turbine unit. The invention realizes the on-line monitoring of the supercooling degree of the condensed water of the condenser, can be used as a guide basis for regulating and controlling the circulating water flow of the exhaust steam of the cooling low-pressure cylinder, prevents waste caused by excessive circulating water flow, and can effectively help solve the problems that more energy is needed for heating caused by the supercooling of the condensed water, and the vacuum of the condenser cannot be effectively improved due to too little circulating water flow.
Description
Technical Field
The invention relates to the technical field of monitoring of a steam turbine unit, in particular to an on-line monitoring device and method for the supercooling degree of condensed water of a condensing steam turbine unit.
Background
The exhaust steam of the low-pressure cylinder of the condensing steam turbine generator unit is cooled and condensed by circulating water, so that the operating working medium of the steam turbine generator unit is recycled, the supplement of the condensed water quantity of the whole thermodynamic system is reduced, and the economical efficiency of thermodynamic cycle is improved.
The supercooling degree of the condensed water of the condensing steam turbine is used as one of the operating performance indexes of the condenser and can be used as a guide basis for regulating and controlling the flow rate of the circulating water for cooling the exhaust steam of the low-pressure cylinder, so that the situations that waste is caused by excessive flow rate of the circulating water, more energy is needed for heating the condensed water, or the vacuum of the condenser cannot be effectively improved due to too little condensed water are prevented; meanwhile, the super-cooling degree of the condensed water of the condenser can cause the oxygen content of the condensed water to be high, so that the thermal equipment is oxidized and the service life is shortened. The existing condensing steam turbine generator unit lacks the on-line accurate monitoring of the supercooling degree of condensed water of a condenser, thereby influencing the economical efficiency of the unit and increasing the service life loss of equipment.
Disclosure of Invention
In view of the above disadvantages, the invention provides an online monitoring device and method for the condensate supercooling degree of a condensing steam turbine unit, which can monitor the condensate supercooling degree of the condensing steam turbine unit online.
In order to achieve the purpose, the invention adopts the following technical scheme:
an on-line monitoring device for condensate supercooling degree of condensing steam turbine set comprises: the condenser condensation water temperature measuring device is arranged on the condenser body and used for measuring the condensation water temperature in the condenser body; the condenser steam chamber pressure tester is arranged on the condenser body through an airflow buffer device and is used for measuring the steam chamber pressure of the condenser body; the air flow buffer device comprises a porous stainless steel ball and a stainless steel pipe, the porous stainless steel ball is arranged in the condenser body, one end of the stainless steel pipe is arranged in the porous stainless steel ball and is communicated with the inside of the porous stainless steel ball, the stainless steel pipe is distributed at an angle of 45 degrees, the other end of the stainless steel pipe penetrates out of the condenser body, and the condenser steam chamber pressure tester is connected with the outer end part of the stainless steel pipe; and the data acquisition and analysis system is respectively connected with the condenser condensate temperature measuring device and the condenser steam chamber pressure tester, receives the measured data and calculates the condensate supercooling degree so as to realize the on-line monitoring of the condensate supercooling degree.
Furthermore, the condenser condensation water temperature measuring device adopts a platinum resistor temperature sensor.
Furthermore, the condenser steam chamber pressure tester adopts a pressure transmitter.
Furthermore, the condenser steam chamber pressure tester is installed above the sampling port and is connected to the sampling port through a sampling tube, the sampling tube is higher than the sampling port and is led out upwards from the sampling port, and a downward bending tube section is not arranged in the middle of the sampling tube.
Furthermore, a plurality of condenser condensed water temperature measuring devices are arranged in parallel; the condenser steam chamber pressure tester is a plurality of, sets up side by side.
The invention also provides an on-line monitoring method for the condensate supercooling degree of the condensing steam turbine unit, which is characterized in that the on-line monitoring device for the condensate supercooling degree of the condensing steam turbine unit comprises the following steps:
obtaining the temperature T of the condensed water of the condenserCondensed water；
Obtaining the pressure P of the steam chamber of the condenser, and calculating the saturation temperature T of the condensed water of the condenser according to the obtained pressure P of the steam chamber of the condenserSaturation of；
Calculating the supercooling degree delta T of the condensed water of the condenser according to the value, wherein the delta T is TSaturation of-TCondensed water。
Further, the corresponding condenser condensed water saturation temperature T is calculated according to the obtained condenser steam chamber pressure PSaturation ofIn (1),
Tsaturation of＝f(P)，
Wherein, f (p) ═ a (10) + D- ((a (10) + D)2-4×(A(9)+A(10)×D))0.5)/2-273.15，
D＝2×G/(-F-(F2-4×E×G)0.5)，
E＝M2+A(3)×M+A(6)，
F＝A(1)×M2+A(4)×M+A(7)，
G＝A(2)×M2+A(5)×M+A(8)，
M＝(P)0.25；
Wherein,
A(1)＝1167.0521452767，
A(2)＝-724213.16703206，
A(3)＝-17.073846940092，
A(4)＝12020.82470247，
A(5)＝-3232555.0322333，
A(6)＝14.91510861353，
A(7)＝-4823.2657361591，
A(8)＝405113.40542057，
A(9)＝-0.23855557567849，
A(10)＝650.17534844798。
compared with the prior art, the invention has the beneficial effects that:
1. the on-line monitoring method for the condenser condensate supercooling degree can be used for realizing the on-line monitoring of the condenser condensate supercooling degree, can be used as a guide basis for regulating and controlling the circulating water flow of the exhaust steam of the cooling low-pressure cylinder, preventing waste caused by excessive circulating water flow, and effectively helping to solve the problems that more energy is needed for heating caused by the supercooling of the condensate water, and the condenser vacuum cannot be effectively improved due to the insufficient circulating water flow;
2. the supercooling degree of the condensed water of the condenser is monitored to be favorable for controlling the supercooling degree in a reasonable range, and the exceeding of the oxygen content of the condensed water is avoided, so that the service life loss caused by the oxidation corrosion of equipment can be reduced;
3. the exhaust steam of the low-pressure cylinder is cooled and condensed by circulating water, so that the operating working medium of the steam turbine generator unit is recycled, the low-pressure cylinder is widely applied to steam condensing steam turbine generator units in thermal power enterprises, and the on-line monitoring of the supercooling degree of the condensed water of the condenser in real time has obvious effects on energy conservation, consumption reduction, efficiency improvement and income creation;
4. the on-line monitoring device and the method for the supercooling degree of the condensed water of the condenser, which are provided by the invention, have the characteristics of few required signal measuring points, simple and easy installation and implementation of the measuring device and low investment cost, but have obvious energy-saving effect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below.
FIG. 1 is a schematic diagram of one embodiment of the present invention;
fig. 2 is a schematic structural diagram of a condenser steam chamber pressure detection device.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.
The preferred embodiment of the invention provides an online monitoring device for the supercooling degree of condensed water of a condensing steam turbine unit, which mainly comprises a condenser condensed water temperature measuring device 9, a condenser steam chamber pressure tester 5 and a data acquisition and analysis system 10.
Referring to fig. 1, a condenser condensation water temperature measuring device 9 is installed on a condenser body 6 for measuring the condensation water temperature in the condenser body 6. The condenser condensation water temperature measuring device 9 adopts an A-grade platinum resistor temperature sensor, is fixed by a movable screw, the joint is coated with butter after the screw is fixed or other coatings for preventing the joint from leaking to cause air inlet of the condenser, and a temperature sensing element is directly contacted with condensation water, so that the rapid real-time conversion of temperature signals to electric signals is realized.
Referring to fig. 1 and 2, the condenser steam chamber pressure tester is mounted on the condenser body through an airflow buffer device for measuring the steam chamber pressure of the condenser body, the airflow buffer device comprises a porous stainless steel ball and a stainless steel pipe, the porous stainless steel ball is mounted in the condenser body, one end of the stainless steel pipe is mounted in the porous stainless steel ball and is communicated with the inside of the porous stainless steel ball, the stainless steel pipe is distributed at 45 degrees, the other end of the stainless steel pipe penetrates out of the condenser body, and the condenser steam chamber pressure tester is connected with the outer end part of the stainless steel pipe. The stainless steel tube 4 is a DN25 multiplied by 2.0 type stainless steel tube, 8 steam through holes with phi of 3.0mm are uniformly arranged on the tube walls of 5 parallel planes with 45-degree angles to the central line of the stainless steel tube, and the distance between the 5 parallel planes is 15 mm; the porous stainless steel ball 3 is a spherical hollow body of phi 200, the wall thickness is 2.0mm, a plurality of phi 3.0mm steam through holes are uniformly arranged along the spherical surface, and the central distance of the holes along the spherical surface is about 6.0 mm. The bottom of the stainless steel tube 4 is provided with a through hole so as to discharge accumulated water. When the device is implemented, airflow enters from the steam through holes of the porous stainless steel ball 3 and then enters the stainless steel pipe 4 from the steam through holes of the stainless steel pipe 4, and the condenser steam chamber pressure tester 5 performs air pressure detection to measure the steam chamber pressure of the condenser body 6.
The condenser steam chamber pressure tester 5 adopts a pressure transmitter (such as an EJA series absolute pressure transmitter or a Rosemount 3051 absolute pressure transmitter); condenser steam chamber pressure tester 5 of pressure transmitter type is installed in the top of sample connection, is connected to the sample connection through the sampling tube, and the sampling tube between pressure transmitter and the sample connection is higher than the sample connection, upwards draws from the sample connection, and the middle part does not have the downwarping pipeline section, realizes the test to condenser steam chamber pressure signal, and with the intraductal ponding of sample drainage before the pressure transmitter installation, prevent to have the influence of remaining water column to measurement accuracy in the sampling tube.
The data acquisition and analysis system 10 adopts an OVATION decentralized control system, is respectively connected with the condenser condensate temperature measuring device 9 and the condenser steam chamber pressure tester 5, receives the measured data and calculates the condensate supercooling degree so as to realize the online monitoring of the condensate supercooling degree.
Referring to fig. 1, the condenser includes a condenser body 6, and a circulating water pump 1, a condenser vacuum pump 2, a condenser heat exchange tube 7, a circulating water outlet butterfly valve 8, and corresponding pipelines installed on the condenser body 6, which are prior art and will not be explained and described in detail.
The preferred embodiment provides a condensate supercooling degree on-line monitoring method for a condensing steam turbine unit, which uses the condensate supercooling degree on-line monitoring device for the condensing steam turbine unit, and comprises the following steps:
obtaining the temperature T of the condensed water of the condenserCondensed water；
Obtaining a gelThe steam chamber pressure P of the steam condenser is obtained, and the corresponding condenser condensed water saturation temperature T is calculated according to the obtained steam chamber pressure P of the steam condenserSaturation of；
Calculating the supercooling degree delta T of the condensed water of the condenser according to the value, wherein the delta T is TSaturation of-TCondensed water。
Wherein, condenser condensation water temperature measuring device 9 tests condenser condensation water temperature TCondensed waterAnd a condenser steam chamber pressure tester 5 tests the condenser steam chamber pressure P.
Wherein, the saturation temperature T corresponding to the condensed water of the condenserSaturation ofIn the calculation according to the obtained steam chamber pressure P of the condenser,
Tsaturation of＝f(P)，
Wherein, f (p) ═ a (10) + D- ((a (10) + D)2-4×(A(9)+A(10)×D))0.5)/2-273.15，
D＝2×G/(-F-(F2-4×E×G)0.5)，
E＝M2+A(3)×M+A(6)，
F＝A(1)×M2+A(4)×M+A(7)，
G＝A(2)×M2+A(5)×M+A(8)，
M＝(P)0.25；
Wherein,
A(1)＝1167.0521452767，
A(2)＝-724213.16703206，
A(3)＝-17.073846940092，
A(4)＝12020.82470247，
A(5)＝-3232555.0322333，
A(6)＝14.91510861353，
A(7)＝-4823.2657361591，
A(8)＝405113.40542057，
A(9)＝-0.23855557567849，
A(10)＝650.17534844798。
by obtaining condenser condensation water temperature TCondensed waterAnd obtaining the pressure P of the steam chamber of the condenser, and calculating the corresponding saturated condensed water of the condenser according to the pressure P of the steam chamber of the condenserAnd temperature TSaturation ofAnd then, calculating the supercooling degree delta T of the condensed water of the condenser according to the values. In the embodiment, the saturation temperature T corresponding to the steam chamber pressure P of the condenser is adoptedSaturation ofThe formula calculation method realizes the direct calculation of the saturation temperature T corresponding to the steam chamber pressure P of the condenser according to the steam chamber pressure P of the condenserSaturation ofTherefore, the supercooling degree delta T of the condenser condensed water is calculated in real time, the effect of displaying the supercooling degree delta T of the condenser condensed water in real time is achieved, and operation operators can regulate and control the supercooling degree delta T according to requirements.
More specifically, taking a certain 300 MW-class unit project as an example, the unit project is a subcritical, once intermediate reheating, single-shaft and condensing steam turbine, and the model is as follows: n300-16.7/537/537-8. The condenser condensation water temperature measuring device 9, the condenser steam chamber pressure tester 5 and the like respectively adopt 3 sets of devices, and signals tested by the 3 sets of devices are subjected to arithmetic average reuse so as to further improve the precision. The online monitoring data of the condensate supercooling degree of the condensing steam turbine set by adopting the invention is shown in table 1.
TABLE 1 condensate supercooling degree on-line monitoring data
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (7)
1. The utility model provides a condensing steam turbine unit condensate water super-cooling degree on-line monitoring device which characterized in that, including:
a condenser condensation water temperature measuring device (9) which is installed on a condenser body (6) and is used for measuring the condensation water temperature in the condenser body (6);
the condenser steam chamber pressure tester (5) is arranged on the condenser body (6) through an airflow buffer device and is used for measuring the steam chamber pressure of the condenser body (6); the air flow buffer device comprises a porous stainless steel ball (3) and a stainless steel pipe (4), the porous stainless steel ball (3) is installed in a condenser body (6), one end of the stainless steel pipe (4) is installed in the porous stainless steel ball (3) and communicated with the inside of the porous stainless steel ball (3), the stainless steel pipe (4) is distributed at an angle of 45 degrees, the other end of the stainless steel pipe penetrates out of the condenser body (6), and a condenser steam chamber pressure tester (5) is connected with the outer end part of the stainless steel pipe (4);
and the data acquisition and analysis system (10) is respectively connected with the condenser condensate temperature measuring device (9) and the condenser steam chamber pressure tester (5), receives the measured data and calculates the condensate supercooling degree so as to realize the online monitoring of the condensate supercooling degree.
2. The on-line monitoring device for the condensate supercooling degree of the condensing steam turbine unit according to claim 1, wherein the condenser condensate temperature measuring device (9) adopts a platinum resistance temperature sensor.
3. The on-line monitoring device for the condensate supercooling degree of the condensing steam turbine unit according to claim 1, wherein the condenser steam chamber pressure tester (5) adopts a pressure transmitter.
4. The condensate supercooling degree on-line monitoring device of the condensing steam turbine unit according to claim 3, wherein the condenser steam chamber pressure tester (5) is installed above the sampling port and connected to the sampling port through a sampling pipe, the sampling pipe is higher than the sampling port and is led out from the sampling port upwards, and a pipe section with no downward bending is arranged in the middle.
5. The condensate water supercooling degree on-line monitoring device of the condensing steam turbine unit according to claim 1, wherein the condenser condensate water temperature measuring devices (9) are arranged in parallel; the condenser steam chamber pressure tester (5) is a plurality of and is arranged side by side.
6. An on-line monitoring method for the condensate supercooling degree of a condensing steam turbine unit is characterized in that the on-line monitoring device for the condensate supercooling degree of the condensing steam turbine unit of any one of claims 1 to 5 is used, and comprises the following steps:
obtaining the temperature T of the condensed water of the condenserCondensed water；
Obtaining the pressure P of the steam chamber of the condenser, and calculating the saturation temperature T of the condensed water of the condenser according to the obtained pressure P of the steam chamber of the condenserSaturation of；
Calculating the supercooling degree delta T of the condensed water of the condenser according to the value, wherein the delta T is TSaturation of-TCondensed water。
7. The on-line monitoring method for the supercooling degree of the condensed water of the condensing steam turbine unit according to claim 6, wherein the corresponding saturation temperature T of the condensed water of the condenser is calculated according to the obtained pressure P of the steam chamber of the condenserSaturation ofIn (1),
Tsaturation of＝f(P)，
Wherein, f (p) ═ a (10) + D- ((a (10) + D)2-4×(A(9)+A(10)×D))0.5)/2-273.15，
D＝2×G/(-F-(F2-4×E×G)0.5)，
E＝M2+A(3)×M+A(6)，
F＝A(1)×M2+A(4)×M+A(7)，
G＝A(2)×M2+A(5)×M+A(8)，
M＝(P)0.25；
Wherein,
A(1)＝1167.0521452767，
A(2)＝-724213.16703206，
A(3)＝-17.073846940092，
A(4)＝12020.82470247，
A(5)＝-3232555.0322333，
A(6)＝14.91510861353，
A(7)＝-4823.2657361591，
A(8)＝405113.40542057，
A(9)＝-0.23855557567849，
A(10)＝650.17534844798。
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Application publication date: 20200327 |