CN205352479U - Main steam flow's of gas and steam combined cycle power plant measurement system - Google Patents
Main steam flow's of gas and steam combined cycle power plant measurement system Download PDFInfo
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- CN205352479U CN205352479U CN201520723242.3U CN201520723242U CN205352479U CN 205352479 U CN205352479 U CN 205352479U CN 201520723242 U CN201520723242 U CN 201520723242U CN 205352479 U CN205352479 U CN 205352479U
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Abstract
The utility model relates to a main steam flow's of gas and steam combined cycle power plant measurement system, its characterized in that: including central processing unit, a plurality of PRESSURE DETECTOR and a plurality of thermodetector, respectively be equipped with a thermodetector and a PRESSURE DETECTOR in the front end and the rear end of the chopped -off head blade of steam turbine level, form two at least temperature check point (7) and two at least PRESSURE DETECTOR points (8), thermodetector signal output part, PRESSURE DETECTOR signal output part respectively connect central processing unit's signal input part, central processing unit receive carry out the mark to the data source after the data and calculate the outflow coefficient, then according to the fu liugeer formula in the steam turbine theory, obtain the actual steam flow value of acting in the steam turbine under the arbitrary operating mode, promptly the owner steam flow of gas and steam combined cycle power plant value. The utility model has the characteristics of system maintenance convenience, flow value measurement accuracy height and use value are high.
Description
Technical field
This utility model relates to the measurement system of a kind of Combined cycle gas-steam turbine power plant main steam flow, belongs to combined-cycle power plant's main steam flow field of measuring technique.
Background technology
The steam turbine of Combined Cycle Unit, in the method for operation, is generally abandoned the regulative mode that steam turbine in conventional power plant adopts steam pressure constant constant, and is used sliding pressure operation mode instead, and this method of operation makes steam turbine can send some secondary powers more.Therefore, for the Combined Cycle Unit steam turbine of sliding pressure operation, generally do not debug assistant warden, be conducive to improving the level group efficiency of steam turbine.
At present, in all combined-cycle power plants, widely used direct measuring measures main steam flow.The main steam line that waste heat boiler supplies steam turbine installs standard knot fluid element, for instance flow nozzle or orifice plate.At the forward and backward installation pressure and temperature measuring point of standard knot fluid element, thus recording the pressure signal that restricting element is forward and backward, this pressure differential reaches computer calculating by pressure difference transmitter and records flow signal.Such measuring method has a disadvantage in that
1) scope is restricted, certainty of measurement is relatively low in measurement.In the process of calculated flow rate, except pressure reduction and temperature signal, in addition it is also necessary to the parameters such as steam flow coefficient, the flow velocity coefficient of expansion and vapour density participate in calculating.When unit sliding parameter runs or unit load changes, steam flow coefficient and vapour density change in value are bigger, vapour density can be compensated and corrected by pressure and temperature, and steam flow coefficient is relevant with changes in flow rate itself, in order to ensure certainty of measurement, typically require the excursion of limited flow coefficient, change about the steam flow calculated value under namely running around unit declared working condition, but amplitude of variation needs restriction.Therefore, in practical implementation, directly measure and when only running near unit declared working condition parameter, ensure that the precision that measurement is higher, and be difficult to when degree of depth variable working condition obtain satisfied measurement result.
2) flow meter calibration difficulty, reduces the safety of unit operation.Owing to the function that Combined Cycle Unit is maximum is for electric load peak regulation, therefore its operating load fluctuating margin is relatively big, and steam parameter generally runs at off-rating, causes that difficulty demarcated by flow correction and steam-flow meter.In Practical Project, direct measuring is measured main steam flow and be cannot function as the foundation that unit efficiency calculates, also really computational analysis data source cannot be provided for unit operation economic performance, thus causing that " false water level " probability of occurrence of boiler vapor liquid level increases, add unit operation operation easier, be unfavorable for the safe operation of unit.
3) economy of unit operation it is unfavorable for.Restricting element investment is big, it is difficult in maintenance to install, and restricting element is easily caused by certain restriction loss, increases pipeline medium resistance, reduces pipeline efficiency, reduce unit operation economy simultaneously.
Utility model content
The purpose of this utility model is, for solving prior art when measuring main steam, main steam line is installed standard knot fluid element and causes that measurement scope is restricted, certainty of measurement is relatively low, flow meter calibration is difficult and adds pipeline medium resistance, reduce the problems such as pipeline efficiency, it is provided that the measurement system of a kind of Combined cycle gas-steam turbine power plant main steam flow.
The purpose of this utility model can be passed through to adopt the following technical scheme that and reach:
A kind of measurement system of Combined cycle gas-steam turbine power plant main steam flow, it is characterized in that: include central processing unit, several pressure detectors and several temperature detectors, it is respectively provided with a temperature detector and a pressure detector in the front-end and back-end of the first-level blade of steam turbine level, or the front-end and back-end of the leaf-level group that flow is linear with pressure in the cylinder are respectively provided with temperature detector and pressure detector；Form at least two temperature detecting point and at least two pressure detector points；The signal output part of temperature detector connects one of signal input part of central processing unit, the signal output part of pressure detector connects the two of the signal input part of central processing unit, temperature detector converts the temperature data under any operating mode detected to the signal of telecommunication and is sent to central processing unit, pressure data under any operating mode detected is converted to the signal of telecommunication and is sent to central processing unit by pressure detector, Data Source is carried out mark after receiving data and starts built-in computing module by central processing unit, discharge coefficient is calculated by computing module, then according to the Fu Liugeer formula in steam turbine theory, the i.e. relation of pressure and Design of Steam Turbine theoretical value after flow and level group, obtain the actual steam flow value done work in steam turbine under any operating mode, i.e. Combined cycle gas-steam turbine power plant main steam flow value.
The two of the purpose of this utility model can also pass through to adopt the following technical scheme that and reach:
Further, described temperature detection is made up of thermocouple, and described pressure detector is made up of pressure transmitter.
Further, described computing module can according to the pressure and temperature data received, substitute into the Fu Liugeer formula in steam turbine theory and calculate main steam flow, and put into axle envelope and door rod leakage vapour steam flow, reject steam amount and the boiler spray desuperheating water yield correction of execution correspondence according to steam turbine with or without bypath system.
This utility model has following prominent beneficial effect:
1, this utility model by being respectively provided with temperature detecting point and pressure detecting point in the front-end and back-end of the first-level blade of steam turbine level, or the front-end and back-end of the leaf-level group that flow and pressure are linear in the cylinder are respectively provided with temperature detecting point and pressure detecting point；The pressure signal that the temperature signal detected in any operating mode according to described temperature detecting point and pressure detecting point detect under any operating mode, calculate discharge coefficient, then according to the Fu Liugeer formula in steam turbine theory, the i.e. relation of pressure and Design of Steam Turbine theoretical value after flow and level group, obtain the actual steam flow value done work in steam turbine under any operating mode, i.e. Combined cycle gas-steam turbine power plant main steam flow value.Therefore, it is possible to solve prior art when measuring main steam, main steam line is installed standard knot fluid element and causes that measurement scope is restricted, certainty of measurement is relatively low, flow meter calibration is difficult and adds pipeline medium resistance, reduce the problems such as pipeline efficiency, have and reduce restricting element, reduce pipeline medium resistance, be easy to plant maintenance and improve the efficiency of maximum duty and declared working condition tubine and the beneficial effect of the economy of unit operation.
2, this utility model adopts flow indirect measuring technology, by corrected Calculation model, makes certainty of measurement be greatly improved under unit varying duty.The accuracy of measurement of steam flow improves, for the data foundation that operations staff is important to the analysis of Unit Economic performance and interruption of service analysis offer.The steam parameter correction related to when variable working condition is easier to realize, and effectively solves direct measuring restricted.The accurate adjustment of boiler water level, reduces the occurrence probability of false water level, reduces and run operation easier, make unit safer.
3, this utility model goes to measure main steam by measurement system, can perform corresponding measuring method and modification method according to measuring environment, it is adaptable to various Combined cycle gas-steam turbine power plant.
Accompanying drawing explanation
Fig. 1 is the two-stage pressure system schematic diagram that this utility model is applied to combined-cycle power plant's main steam of the following rank of F level.
Fig. 2 is the three stage pressure system schematic that this utility model is applied to combined-cycle power plant's main steam of more than F level and F level.
Fig. 3 is the another kind of embodiment schematic diagram that this utility model is applied to three stage pressure systems of combined-cycle power plant's main steam of more than F level and F level.
Detailed description of the invention
Below in conjunction with accompanying drawing, the measurement system of a kind of Combined cycle gas-steam turbine power plant of the present utility model main steam flow is described in further detail.
Specific embodiment 1:
The measurement system of the Combined cycle gas-steam turbine power plant main steam flow that the present embodiment 1 relates to, including central processing unit, several pressure detectors and several temperature detectors, it is respectively provided with a temperature detector and a pressure detector in the front-end and back-end of the first-level blade of steam turbine level, or the front-end and back-end of the leaf-level group that flow is linear with pressure in the cylinder are respectively provided with temperature detector and pressure detector；Form at least two temperature detecting point 7 and at least two pressure detector points 8；The signal output part of temperature detector connects one of signal input part of central processing unit, the signal output part of pressure detector connects the two of the signal input part of central processing unit, temperature detector converts the temperature data under any operating mode detected to the signal of telecommunication and is sent to central processing unit, pressure data under any operating mode detected is converted to the signal of telecommunication and is sent to central processing unit by pressure detector, after central processing unit reception data, Data Source is carried out labelling and starts built-in computing module, discharge coefficient is calculated by computing module, then according to the Fu Liugeer formula in steam turbine theory, the i.e. relation of pressure and Design of Steam Turbine theoretical value after flow and level group, obtain the actual steam flow value done work in steam turbine under any operating mode, i.e. Combined cycle gas-steam turbine power plant main steam flow value.Numerical procedure that wherein different pieces of information source is corresponding particularly as follows:
With reference to Fig. 1, when pressure and temperature signal is respectively from the high and low cylinder pressure cylinder of steam turbine time, computing module according to main steam system with or without bypath system put into operation correspondence discharge coefficient numerical procedure and amendment scheme, pressure in high pressure cylinder 2 and the calculated flow value of temperature signal data be high pressure main steam 101 flow value；It is low pressure main steam 103 flow value by pressure in low pressure (LP) cylinder 4 and the calculated flow value of temperature signal data.
With reference to Fig. 3, when pressure and temperature signal is respectively from the high, medium and low cylinder pressure cylinder of steam turbine time, computing module according to main steam system with or without bypath system put into operation correspondence discharge coefficient numerical procedure and amendment scheme, pressure in high pressure cylinder 2 and the calculated flow value of temperature signal be high pressure main steam 101 flow value；It is that intermediate pressure cylinder enters vapour 202 flow value by pressure in intermediate pressure cylinder 3 and the calculated flow value of temperature signal；It is that low pressure (LP) cylinder enters vapour 302 flow value by pressure in low pressure (LP) cylinder 4 and the calculated flow value of temperature signal；Deduct intermediate pressure cylinder and enter vapour 202 flow value by low pressure (LP) cylinder being entered vapour 302 flow value and obtain low pressure main steam 103 flow value；Intermediate pressure cylinder enters vapour 202 flow value and deducts high pressure main steam 101 flow value and obtain middle pressure main steam 102 flow value.
With reference to Fig. 2, when pressure and temperature signal be respectively from steam turbine high and low cylinder pressure 4 cylinder and middle pressure main steam 102 pipeline on standard knot fluid element 6 time, computing module according to main steam system with or without bypath system put into operation correspondence discharge coefficient numerical procedure and amendment scheme, pressure in high pressure cylinder 2 and the calculated flow value of temperature signal be high pressure main steam 101 flow value；The calculated flow value of pressure and temperature signal obtained by the standard throttling original paper on middle pressure main steam 102 pipeline is middle pressure main steam 102 flow value；Being that low pressure (LP) cylinder enters vapour 302 flow value by pressure in low pressure (LP) cylinder 4 and the calculated flow value of temperature signal, low pressure (LP) cylinder enters vapour 302 flow value and deducts high pressure main steam 101 and middle pressure main steam 102 obtains low pressure main steam 103 flow value.
Described temperature detection is made up of thermocouple, and described pressure detector is made up of pressure transmitter.Computing module can according to the pressure and temperature data received, substitute into the Fu Liugeer formula in steam turbine theory and calculate main steam flow, and put into axle envelope and door rod leakage vapour steam flow, reject steam amount and the boiler spray desuperheating water yield correction of execution correspondence according to steam turbine with or without bypath system；When reality measures the steam flow of acting in cylinder, it is contemplated that axle envelope and door rod leakage vapour steam flow, reject steam amount and the impact on the steam that does work in cylinder of the boiler spray desuperheating water yield flow, according to engineering experience, when can pass through calculated flow rate coefficient, it being modified, modification method is as follows:
Main steam flow Gn=enters flow G1+ axle envelope and the door rod steam loss G2+ reject steam amount G3-boiler spray desuperheating water yield G4 of steam turbine；
1) system not put into operation for bypath system, G3 is 0, and in steam turbine, steam flow rate degree reaches critical；It is 2% that G2 accounts for load proportion, and the computing formula obtaining main steam flow is as follows:
In formula, K is discharge coefficient, Gn is main steam flow, G0 is for entering steam turbine main steam declared working condition flow, P10 is pressure before the level group under declared working condition, and T10 is temperature before the level group under declared working condition, and P1n is pressure before the level group under variable working condition, T1n is temperature before the level group under variable working condition, and Pn0 is pressure after the level group under declared working condition.
2) for putting into the system that bypath system is run, Turbine Steam Flow Velocity does not reach critical, and it is 2% that G2 accounts for load, is suitably amplified based on debugging test data by discharge coefficient k, and computing formula is as follows:
In formula, K is discharge coefficient, Gn is main steam flow, G0 is for entering steam turbine main steam declared working condition flow, P10 is pressure before the level group under declared working condition, and T10 is temperature before the level group under declared working condition, and P1n is pressure before the level group under variable working condition, T1n is temperature before the level group under variable working condition, and P2n is pressure after the level group under variable working condition.
Above in conjunction with accompanying drawing, preferred implementation of the present utility model is explained in detail; but this utility model is not limited to above-mentioned embodiment; in the ken that those of ordinary skill in the art possess; various change can also be made, as by the temperature sensor replacement critesistor in measurement system of the present utility model, pressure transducer are replaced with pressure difference transmitter etc. and belong to the scope of this utility model protection under the premise without departing from this utility model objective.
Claims (2)
1. the measurement system of a Combined cycle gas-steam turbine power plant main steam flow, it is characterized in that: include central processing unit, several pressure detectors and several temperature detectors, it is respectively provided with a temperature detector and a pressure detector in the front-end and back-end of the first-level blade of steam turbine level, or the front-end and back-end of the leaf-level group that flow is linear with pressure in the cylinder are respectively provided with temperature detector and pressure detector；Form at least two temperature detecting point (7) and at least two pressure detectors point (8)；The signal output part of temperature detector connects one of signal input part of central processing unit, the signal output part of pressure detector connects the two of the signal input part of central processing unit, temperature detector converts the temperature data under any operating mode detected to the signal of telecommunication and is sent to central processing unit, pressure data under any operating mode detected is converted to the signal of telecommunication and is sent to central processing unit by pressure detector, after central processing unit reception data, Data Source is carried out labelling and starts built-in computing module, discharge coefficient is calculated by computing module, then according to the Fu Liugeer formula in steam turbine theory, the i.e. relation of pressure and Design of Steam Turbine theoretical value after flow and level group, obtain the actual steam flow value done work in steam turbine under any operating mode, i.e. Combined cycle gas-steam turbine power plant main steam flow value.
2. the measurement system of a kind of Combined cycle gas-steam turbine power plant according to claim 1 main steam flow, it is characterised in that: described temperature detection is made up of thermocouple, and described pressure detector is made up of pressure transmitter.
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| CN201520723242.3U CN205352479U (en) | 2015-09-17 | 2015-09-17 | Main steam flow's of gas and steam combined cycle power plant measurement system |
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| CN201520723242.3U CN205352479U (en) | 2015-09-17 | 2015-09-17 | Main steam flow's of gas and steam combined cycle power plant measurement system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111123770A (en) * | 2019-12-13 | 2020-05-08 | 山东中实易通集团有限公司 | Method and device for determining opening of bypass model under FCB working condition |
| CN112880761A (en) * | 2021-01-29 | 2021-06-01 | 山东中实易通集团有限公司 | Method and system for measuring circulating water flow |
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2015
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111123770A (en) * | 2019-12-13 | 2020-05-08 | 山东中实易通集团有限公司 | Method and device for determining opening of bypass model under FCB working condition |
| CN112880761A (en) * | 2021-01-29 | 2021-06-01 | 山东中实易通集团有限公司 | Method and system for measuring circulating water flow |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160629 Termination date: 20200917 |