CN103954380B - A kind of assay method of Turbo-generator Set exhaust enthalpy - Google Patents
A kind of assay method of Turbo-generator Set exhaust enthalpy Download PDFInfo
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- 238000003556 assay Methods 0.000 title abstract description 6
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- 238000006396 nitration reaction Methods 0.000 claims description 6
- 238000010248 power generation Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 5
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Abstract
Present invention relates particularly to the assay method of a kind of Turbo-generator Set exhaust enthalpy, it, by calculating steam turbine generator low pressure (LP) cylinder internal power and steam turbine generator low pressure (LP) cylinder ideal internal power, finally determines steam turbine generator exhaust enthalpy.The exhaust enthalpy assay method that the present invention proposes both had avoided the measurement of steam turbine last stage humidity, again without considering that low pressure (LP) cylinder is in wet-steam region and calculates, especially under underload, low pressure (LP) cylinder cylinder is in wet-steam region fall and expands, and greatly facilitates the Eco-power on-line monitoring of condensing turbine.The exhaust enthalpy precision that the present invention obtains is higher, and absolute error is 1.194%, can meet requirement of engineering.
Description
Technical field
The present invention relates to the parametric measurement field of Turbo-generator Set, be specifically related to a kind of Turbo-generator Set exhaust enthalpy
Assay method.
Background technology
In thermal power plant, the steam discharge of steam turbine is in wet-steam region, and the humidity of steam discharge can not be directly true by state parameter
Fixed, the internal efficiency ratio of steam discharge enthalpy and steam turbine cannot directly determine, the reason that bundle grade blade fractures and water erosion is formed is the most difficult
To analyze, to judge.So, measure and determine steam turbine last stage humidity, become current large-sized unit on-line monitoring and fault diagnosis already
Middle urgent problem.There are about 70 kinds of Dynamic Non-Destruction Measurements at present, wherein laser method, optical method, microwave method are applied the widest
General, the measuring method of steam turbine exhaust steam moisture mainly has: thermodynamic method, chemical method, heat balance method of, element tracking method, laser method,
Infrared method, optical method, microwave method etc..But the actual application at the scene of these methods is few, is the most only in laboratory stage.Due to
Lack the effective ways that the exhaust steam moisture of steam turbine generator is measured, also cause steam discharge enthalpy to calculate, it is difficult to effectively to carry out
Steam turbine thermal test and on-line monitoring.
Summary of the invention
The invention provides a kind of without measuring steam turbine last stage humidity, on-line monitoring internal efficiency ratio easily and effectively and
The method determining turbine LP rotors exhaust enthalpy.
Technical scheme is as follows:
The method of the present invention comprises the steps:
Step one: the calculating of steam turbine generator low pressure (LP) cylinder internal power,
A: read the electrical power of steam turbine generator, and damage according to steam turbine generator machinery efficiency calculation steam turbine generator machinery
Lose △ Pm, read steam turbine generator power generation loss △ P according to steam turbine generator loss curveg, calculate steamer according to formula (1) and send out
The output internal power P of motori ,
Pi = Pg + △Pm+△ Pg (1)
Wherein PiFor the output internal power of steam turbine generator, unit is MW；
PgFor turbine generator electric power, unit is MW；
△PmLosing for steam turbine generator machinery, unit is MW；
△ PgLosing for steam turbine generator, unit is MW；
B: obtain the steam parameter enthalpy of steam turbine generator high pressure cylinder according to steam parameters table, measures and enters turbine generator
The flow of every one-level in machine high pressure cylinder, and the internal power P of high pressure cylinder is calculated according to formula (2)H；Obtain according to steam parameters table
The steam parameter enthalpy of steam turbine generator intermediate pressure cylinder, measures and enters the flow of every one-level in steam turbine generator intermediate pressure cylinder, and according to
Formula (3) calculates the internal power P of intermediate pressure cylinderI；The internal power P of low pressure (LP) cylinder is calculated according to formula (4)L；
PH = Q0-t(h0-ht) +Qt-1(ht-h1)+ Q1-2(h1-h2) (2)
PI= Qzr-3(hzr-h3) +Q3-4(h3-h4) (3)
PL= Pi - PH – PI(4)
Wherein PHFor steam turbine generator high pressure cylinder internal power, unit is MW；
PIFor steam turbine generator intermediate pressure cylinder internal power, unit is MW；
PLFor steam turbine generator low pressure (LP) cylinder internal power, unit is MW；
Q0-tFor flowing through flow from high pressure cylinder import to governing stage, unit is t/h；
Qt-1For flowing through flow from governing stage to section extraction opening, unit is t/h；
Q1-2For flowing through flow from one section of extraction opening to two-stage nitration extraction opening, unit is t/h；
Qzr-3For flowing through flow from intermediate pressure cylinder import to three section extraction opening, unit is t/h；
Q3-4For flowing through flow from three sections of extraction openings to four sections extraction opening, unit is t/h；
h0For main steam enthalpy, unit is kJ/kg；
htFor governing stage steam enthalpy, unit is kJ/kg；
h1Being one section of enthalpy that draws gas, unit is kJ/kg；
h2Drawing gas enthalpy for two-stage nitration, unit is kJ/kg；
hzrFor reheated steam enthalpy, unit is kJ/kg；
h3Being three sections of enthalpies that draw gas, unit is kJ/kg；
h4Being four sections of enthalpies that draw gas, unit is kJ/kg；
Step 2: the calculating of steam turbine generator low pressure (LP) cylinder ideal internal power,
A: measure the heat entering steam turbine generator, and calculate the complete machine ideal internal strength of steam turbine generator according to formula (5)
Rate,
Pt = ηt ×Q0/ 3600 (5)
Wherein PtFor the complete machine ideal internal power of steam turbine generator, unit is MW；
ηtFor the steam turbine generator Ideal Cycle thermal efficiency, unit is %；
Q0For being entered the heat of steam turbine by boiler, recepting the caloric including superheater caloric receptivity and reheater, unit is kJ/h；
B: calculate Turbo-generator Set low pressure (LP) cylinder ideal internal power according to formula (6),
PL t= Pt - PHt– PI t (6)
Wherein PtFor the complete machine ideal internal power of steam turbine, unit is MW；
PHtFor high pressure cylinder ideal internal power, unit is MW；
PI tFor intermediate pressure cylinder ideal internal power, unit is MW；
PL t For low pressure (LP) cylinder ideal internal power, unit is MW；
Step 3: the calculating of steam turbine generator exhaust enthalpy,
Steam turbine generator exhaust enthalpy is calculated according to formula (7),
(7)
Wherein: wherein: hL-low pressure (LP) cylinder steam admission enthalpy, unit is kJ/kg；
hs-low pressure (LP) cylinder constant entropy exhaust enthalpy, unit is kJ/kg；
hc-low pressure (LP) cylinder exhaust enthalpy, unit is kJ/kg.
The invention have the benefit that
The exhaust enthalpy assay method that the present invention proposes both had avoided the measurement of steam turbine last stage humidity, again without considering low pressure
Cylinder is in wet-steam region and calculates, and especially under underload, low pressure (LP) cylinder cylinder is in wet-steam region fall and expands, and greatly facilitates condensing-type
The Eco-power on-line monitoring of steam turbine.The exhaust enthalpy precision that the present invention obtains is higher, and absolute error is 1.194%, can meet engineering
Need.
Detailed description of the invention
Embodiment 1
Detection example: have detected the supercritical of NZK600-24.2/566/566 model, triplex four steam discharge, once centre
Reheating, single shaft, Direct Air-Cooled condensing steam turbine generator group, its actual parameter be main steam pressure, temperature be 24.2MPa, 566
℃；Reheat temperature is 566 DEG C.
Determine the exhaust enthalpy of this Turbo-generator Set according to following method, detection data and result of the test are as shown in table 1.
Step one: the calculating of steam turbine generator low pressure (LP) cylinder internal power.
A: read the electrical power of steam turbine generator, and damage according to steam turbine generator machinery efficiency calculation steam turbine generator machinery
Lose △ Pm, read steam turbine generator power generation loss △ P according to steam turbine generator loss curveg, calculate steamer according to formula (1) and send out
The output internal power P of motori ,
Pi = Pg + △Pm+△ Pg (1)
Wherein PiFor the output internal power of steam turbine generator, unit is MW；
PgFor turbine generator electric power, unit is MW；
△PmLosing for steam turbine generator machinery, unit is MW；
△ PgLosing for steam turbine generator, unit is MW.
B: obtain the steam parameter enthalpy of steam turbine generator high pressure cylinder according to steam parameters table, measures and enters turbine generator
The flow of every one-level in machine high pressure cylinder, and the internal power P of high pressure cylinder is calculated according to formula (2)H；Obtain according to steam parameters table
The steam parameter enthalpy of steam turbine generator intermediate pressure cylinder, measures and enters the flow of every one-level in steam turbine generator intermediate pressure cylinder, and according to
Formula (3) calculates the internal power P of intermediate pressure cylinderI；The internal power P of low pressure (LP) cylinder is calculated according to formula (4)L；
PH = Q0-t(h0-ht) +Qt-1(ht-h1)+ Q1-2(h1-h2) (2)
PI= Qzr-3(hzr-h3) +Q3-4(h3-h4) (3)
PL= Pi - PH – PI(4)
Wherein PHFor steam turbine generator high pressure cylinder internal power, unit is MW；
PIFor steam turbine generator intermediate pressure cylinder internal power, unit is MW；
PLFor steam turbine generator low pressure (LP) cylinder internal power, unit is MW；
Q0-tFor flowing through flow from high pressure cylinder import to governing stage, unit is t/h；
Qt-1For flowing through flow from governing stage to section extraction opening, unit is t/h；
Q1-2For flowing through flow from one section of extraction opening to two-stage nitration extraction opening, unit is t/h；
Qzr-3For flowing through flow from intermediate pressure cylinder import to three section extraction opening, unit is t/h；
Q3-4For flowing through flow from three sections of extraction openings to four sections extraction opening, unit is t/h；
h0For main steam enthalpy, unit is kJ/kg；
htFor governing stage steam enthalpy, unit is kJ/kg；
h1Being one section of enthalpy that draws gas, unit is kJ/kg；
h2Drawing gas enthalpy for two-stage nitration, unit is kJ/kg；
hzrFor reheated steam enthalpy, unit is kJ/kg；
h3Being three sections of enthalpies that draw gas, unit is kJ/kg；
h4Being four sections of enthalpies that draw gas, unit is kJ/kg.
Step 2: the calculating of steam turbine generator low pressure (LP) cylinder ideal internal power.
A: measure the heat entering steam turbine generator, and calculate the complete machine ideal internal strength of steam turbine generator according to formula (5)
Rate.
Pt = ηt ×Q0/ 3600 (5)
Wherein PtFor the complete machine ideal internal power of steam turbine generator, unit is MW；
ηtFor the steam turbine generator Ideal Cycle thermal efficiency, unit is %；
Q0For being entered the heat of steam turbine by boiler, recepting the caloric including superheater caloric receptivity and reheater, unit is kJ/h.
B: calculate Turbo-generator Set low pressure (LP) cylinder ideal internal power according to formula (6).
PL t= Pt - PHt– PI t (6)
Wherein PtFor the complete machine ideal internal power of steam turbine, unit is MW；
PHtFor high pressure cylinder ideal internal power, unit is MW；
PI tFor intermediate pressure cylinder ideal internal power, unit is MW；
PL t For low pressure (LP) cylinder ideal internal power, unit is MW.
Step 3: the calculating of steam turbine generator exhaust enthalpy.
Steam turbine generator exhaust enthalpy is calculated according to formula (7),
(7)
Wherein: wherein: hL-low pressure (LP) cylinder steam admission enthalpy, unit is kJ/kg；
hs-low pressure (LP) cylinder constant entropy exhaust enthalpy, unit is kJ/kg；
hc-low pressure (LP) cylinder exhaust enthalpy, unit is kJ/kg.
Table 1 embodiment 1
Claims (1)
1. the determination method of a Turbo-generator Set exhaust enthalpy, it is characterised in that it comprises the steps:
Step one: the calculating of steam turbine generator low pressure (LP) cylinder internal power,
A: read the electrical power of steam turbine generator, and lose △ according to steam turbine generator machinery efficiency calculation steam turbine generator machinery
Pm, read steam turbine generator power generation loss △ P according to steam turbine generator loss curveg, calculate steam turbine generator according to formula (1)
Output internal power Pi ,
Pi = Pg + △Pm+△ Pg (1)
Wherein PiFor the output internal power of steam turbine generator, unit is MW；
PgFor turbine generator electric power, unit is MW；
△PmLosing for steam turbine generator machinery, unit is MW；
△ PgLosing for steam turbine generator, unit is MW；
B: obtain the steam parameter enthalpy of steam turbine generator high pressure cylinder according to steam parameters table, measures and enters steam turbine generator height
The flow of every one-level in cylinder pressure, and the internal power P of high pressure cylinder is calculated according to formula (2)H；Steamer is obtained according to steam parameters table
The steam parameter enthalpy of electromotor intermediate pressure cylinder, measures and enters the flow of every one-level in steam turbine generator intermediate pressure cylinder, and according to formula
(3) the internal power P of intermediate pressure cylinder is calculatedI；The internal power P of low pressure (LP) cylinder is calculated according to formula (4)L；
PH = Q0-t(h0-ht) +Qt-1(ht-h1)+ Q1-2(h1-h2) (2)
PI= Qzr-3(hzr-h3) +Q3-4(h3-h4) (3)
PL= Pi - PH – PI(4)
Wherein PHFor steam turbine generator high pressure cylinder internal power, unit is MW；
PIFor steam turbine generator intermediate pressure cylinder internal power, unit is MW；
PLFor steam turbine generator low pressure (LP) cylinder internal power, unit is MW；
Q0-tFor flowing through flow from high pressure cylinder import to governing stage, unit is t/h；
Qt-1For flowing through flow from governing stage to section extraction opening, unit is t/h；
Q1-2For flowing through flow from one section of extraction opening to two-stage nitration extraction opening, unit is t/h；
Qzr-3For flowing through flow from intermediate pressure cylinder import to three section extraction opening, unit is t/h；
Q3-4For flowing through flow from three sections of extraction openings to four sections extraction opening, unit is t/h；
h0For main steam enthalpy, unit is kJ/kg；
htFor governing stage steam enthalpy, unit is kJ/kg；
h1Being one section of enthalpy that draws gas, unit is kJ/kg；
h2Drawing gas enthalpy for two-stage nitration, unit is kJ/kg；
hzrFor reheated steam enthalpy, unit is kJ/kg；
h3Being three sections of enthalpies that draw gas, unit is kJ/kg；
h4Being four sections of enthalpies that draw gas, unit is kJ/kg；
Step 2: the calculating of steam turbine generator low pressure (LP) cylinder ideal internal power,
A: measure the heat entering steam turbine generator, and according to the complete machine ideal internal power of formula (5) calculating steam turbine generator,
Pt = ηt ×Q0/ 3600 (5)
Wherein PtFor the complete machine ideal internal power of steam turbine generator, unit is MW；
ηtFor the steam turbine generator Ideal Cycle thermal efficiency, unit is %；
Q0For being entered the heat of steam turbine by boiler, recepting the caloric including superheater caloric receptivity and reheater, unit is kJ/h；
B: calculate Turbo-generator Set low pressure (LP) cylinder ideal internal power according to formula (6),
PL t= Pt - PHt– PI t (6)
Wherein PtFor the complete machine ideal internal power of steam turbine, unit is MW；
PHtFor high pressure cylinder ideal internal power, unit is MW；
PI tFor intermediate pressure cylinder ideal internal power, unit is MW；
PL t For low pressure (LP) cylinder ideal internal power, unit is MW；
Step 3: the calculating of steam turbine generator exhaust enthalpy,
Steam turbine generator exhaust enthalpy is calculated according to formula (7),
(7)
Wherein: wherein: hL-low pressure (LP) cylinder steam admission enthalpy, unit is kJ/kg；
hs-low pressure (LP) cylinder constant entropy exhaust enthalpy, unit is kJ/kg；
hc-low pressure (LP) cylinder exhaust enthalpy, unit is kJ/kg.
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| CN104483152B (en) * | 2014-12-19 | 2017-03-29 | 东南大学 | The heat consumption rate assay method of non-reheat backheat combined-circulation unit |
| CN106895977B (en) * | 2017-03-13 | 2019-05-28 | 华北电力大学 | A kind of low pressure (LP) cylinder final stage exhaust enthalpy measuring device and calculation method |
| CN108090663B (en) * | 2017-12-11 | 2020-06-26 | 囯网河北省电力有限公司电力科学研究院 | Evaluation method and system for deep peak shaving minimum output of heat supply unit |
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| CN101813562A (en) * | 2010-03-18 | 2010-08-25 | 华北电力大学 | Method for estimating exhaust enthalpy of low pressure cylinder of steam turbine in real time |
| CN102749156A (en) * | 2012-07-13 | 2012-10-24 | 东南大学 | Method for detecting exhaust enthalpy of turbine |
| CN103308312A (en) * | 2013-04-26 | 2013-09-18 | 国家电网公司 | Method for determining exhaust enthalpy of small steam turbine |
| CN103528630A (en) * | 2013-10-16 | 2014-01-22 | 国家电网公司 | Method for computing high-pressure bypass steam leakage rate and high-pressure bypass attemperation water flow rate |
| CN103646176A (en) * | 2013-12-10 | 2014-03-19 | 国家电网公司 | Comprehensive calculation method for energy-saving effect after steam turbine steam seal modification |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813562A (en) * | 2010-03-18 | 2010-08-25 | 华北电力大学 | Method for estimating exhaust enthalpy of low pressure cylinder of steam turbine in real time |
| CN102749156A (en) * | 2012-07-13 | 2012-10-24 | 东南大学 | Method for detecting exhaust enthalpy of turbine |
| CN103308312A (en) * | 2013-04-26 | 2013-09-18 | 国家电网公司 | Method for determining exhaust enthalpy of small steam turbine |
| CN103528630A (en) * | 2013-10-16 | 2014-01-22 | 国家电网公司 | Method for computing high-pressure bypass steam leakage rate and high-pressure bypass attemperation water flow rate |
| CN103646176A (en) * | 2013-12-10 | 2014-03-19 | 国家电网公司 | Comprehensive calculation method for energy-saving effect after steam turbine steam seal modification |
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