CN109187036A - A kind of piping-main scheme back pressure turbine main steam flow calculation method - Google Patents
A kind of piping-main scheme back pressure turbine main steam flow calculation method Download PDFInfo
- Publication number
- CN109187036A CN109187036A CN201810882925.1A CN201810882925A CN109187036A CN 109187036 A CN109187036 A CN 109187036A CN 201810882925 A CN201810882925 A CN 201810882925A CN 109187036 A CN109187036 A CN 109187036A
- Authority
- CN
- China
- Prior art keywords
- main steam
- steam flow
- flow
- main
- back pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/05—Testing internal-combustion engines by combined monitoring of two or more different engine parameters
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Turbines (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The present invention relates to a kind of piping-main scheme back pressure turbine main steam flow calculation methods, it include: based on steam discharge enthalpy, according to flow and power balance equation, through iterating to calculate, so that the last main steam flow being calculated and this new main steam flow error being calculated arrive final main steam flow less than 0.005%.The present invention is based on enthalpy drop methods to measure piping-main scheme back pressure turbine main steam flow, accuracy with higher indirectly.
Description
Technical field
The invention belongs to the diagnosis of Thermal Power Station's heat-economy and field of energy-saving technology more particularly to a kind of piping-main scheme back pressure
Formula steam turbine main steam flow calculation method.
Background technique
Steam turbine main steam flow is the basic data for calculating the performance indicators such as turbine steam rate, heat consumption rate.In steamer
The calculating of main steam flow in machine thermal test is that the condensing water flow measured with the Long Nozzle connect in main condensate pipeline is
Benchmark carries out heat regenerative system thermodynamic computing, obtains main feedwater flow, and then obtain main steam flow.But piping-main scheme is run
Back pressure unit, without condensate system in system, while water supply and main steam line are piping-main scheme operation.Main steam flow is very
Difficulty is calculated indirectly by conventional method, is measured using live main steam flow orifice to main steam flow, meter
Measurement accuracy has absolute effect to statistics main steam flow.
Summary of the invention
The object of the present invention is to provide a kind of piping-main scheme back pressure turbine main steam flow calculation methods, to calculate main pipe
Back pressure turbine main steam flow processed, while live main steam flow meter can be verified by the method.
The present invention provides a kind of piping-main scheme back pressure turbine main steam flow calculation methods, comprising:
Based on steam discharge enthalpy, according to flow and power balance equation, through iterating to calculate, so that the last master being calculated
Steam flow and this new main steam flow error being calculated arrive final main steam flow less than 0.005%.
Further, this method specifically includes:
Based on main feedwater flow, heat regenerative system thermodynamic computing is carried out, each section of extraction flow is obtained；
According to the main steam flow of hypothesis, budget obtains door rod and shaft-packing leakage amount；
Based on each section of obtained extraction flow and door rod and shaft-packing leakage amount, according to power balance equation, new main steaming is obtained
Steam flow amount；
Main steam flow is recalculated using obtained new main steam flow as the main steam flow assumed, until last
New main steam flow error is calculated less than 0.005% with this in the main steam flow being calculated, and stops iterative calculation, this
When obtained main steam flow be final main steam flow.
According to the above aspect of the present invention, by piping-main scheme back pressure turbine main steam flow calculation method, it is indirect based on enthalpy drop method
Measure piping-main scheme back pressure turbine main steam flow, accuracy with higher.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And can be implemented in accordance with the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention and the accompanying drawings.
Detailed description of the invention
Fig. 1 is that certain back pressure type steam turbine generating set system is shown and point layout schematic diagram in one embodiment of the invention；
Fig. 2 is a kind of flow chart of piping-main scheme back pressure turbine main steam flow calculation method of the present invention.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.
Present embodiments provide a kind of piping-main scheme back pressure turbine main steam flow calculation method, comprising:
Based on steam discharge enthalpy, according to flow and power balance equation, through iterating to calculate, so that the last master being calculated
Steam flow and this new main steam flow error being calculated arrive final main steam flow less than 0.005%.
Join shown in Fig. 2, this method specifically includes:
Based on main feedwater flow, heat regenerative system thermodynamic computing is carried out, each section of extraction flow is obtained；
According to the main steam flow of hypothesis, budget obtains door rod and shaft-packing leakage amount；
Based on each section of obtained extraction flow and door rod and shaft-packing leakage amount, according to power balance equation, new main steaming is obtained
Steam flow amount；
Main steam flow is recalculated using obtained new main steam flow as the main steam flow assumed, until last
New main steam flow error is calculated less than 0.005% with this in the main steam flow being calculated, and stops iterative calculation, this
When obtained main steam flow be final main steam flow.
Piping-main scheme back pressure turbine main steam flow calculation method provided in this embodiment, is measured indirectly based on enthalpy drop method
Piping-main scheme back pressure turbine main steam flow, accuracy with higher.
Invention is further described in detail below.
The steam discharge of back pressure turbine is superheated steam, and steam discharge is directly supplied to industrial header vapor, back pressure turbine row
Vapour is in superheated steam zone, steam discharge enthalpy can be readily derived by parameters such as exhaust steam pressure, temperature, in known exhaust enthalpy
Under the premise of, according to flow and power balance equation, through iterating to calculate, main steam flow and this calculating that the last time is calculated
New main steam flow error is obtained less than 0.005%, final main steam flow can be obtained.
Join shown in Fig. 1, certain back pressure type steam turbine generating set includes a back pressure turbine 1；Generator 2；Two high pressures
Feed-water heater (respectively No. 1 high-pressure feed-water heater 3 and No. 2 high-pressure feed-water heater 4)；One oxygen-eliminating device 5.Unit measuring point
Arrangement is as shown in Figure 1, include main steam pressure, temperature；Steam turbine exhaust steam pressure, temperature；One section of extraction pressure, temperature；Two sections of pumpings
Steam pressure, temperature；Three sections of extraction pressures, temperature；No. 1 height adds steam pressure, temperature；No. 2 height add steam pressure, temperature；Deoxygenation
Device initial steam pressure, temperature；Oxygen-eliminating device intake pressure, temperature；No. 1 height adds exit water temperature；No. 2 height add exit water temperature；No. 2 height are added
Saliva temperature；No. 1 HP heater drainage temperature；No. 2 HP heater drainage temperature；Coolant-temperature gage under oxygen-eliminating device；Final feed pressure, temperature.Steamer
Machine is to extraction steam for factories pressure, temperature, flow.In figure, before 1. indicating 2. gland packing leakage indicates the leakage of steam turbine door rod to one section of steam extraction
Vapour, preceding gland packing leakage to oxygen-eliminating device, 3. the forward and backward axle envelope of steam turbine, door rod leak vapour to low pressure oxygen-eliminating device, and 4. steam turbine door rod is leaked
Vapour, axle gland leak-off to gland heater.
Formula involved in the calculation method includes:
Dxs=Dcyjq+Dcyjs+Dx+D2s (1)
Dxshxs=Dcyjqhcyjq+Dcyjshcyjs+Dxhx+D2sh2s (2)
In formula, Dxs、Dcyjq、Dcyjs、Dx、D2sWater flow, oxygen-eliminating device are intake into steam flow amount, oxygen-eliminating device respectively under oxygen-eliminating device
Flow, door rod and gland packing leakage are recycled to oxygen-eliminating device steam flow, No. 2 HP heater drainage flow t/h.
hxs、hcyjq、hcyjs、hx、h2sRespectively oxygen-eliminating device be lauched specific enthalpy, oxygen-eliminating device into vapour specific enthalpy, oxygen-eliminating device water inlet specific enthalpy,
And gland packing leakage is recycled to oxygen-eliminating device steam enthalpy, No. 2 HP heater drainage specific enthalpies, kJ/kg.In formula (1), (2), only oxygen-eliminating device is intake
Flow and oxygen-eliminating device are unknown quantity into steam flow amount, and equation closed loop can solve.
By steam turbine power equilibrium equation:
Arrangement can obtain:
In formula, D0、Dmg、Dqzf、D1e、D2eRespectively main steam flow, door rod steam loss, preceding shaft gland steam leakage, one section of pumping
Vapour amount, two sections of steam extraction amounts, t/h；
h0、htjj、h1e、h2e、hcSpecific enthalpy, one section of steam extraction specific enthalpy, two sections of steam extraction ratios respectively after main steam specific enthalpy, governing stage
Enthalpy, specific enthalpy of exhaust steam, kJ/kg；
Wzd, N be respectively steam turbine shaft power, generator active power, kW；ηm、ηeRespectively mechanical efficiency, generator
Efficiency, %
Showed by taking certain piping-main scheme back pressure unit as an example according to what field test measuring point obtained using above-mentioned calculation method model
Field test data, carries out data processing, it is assumed that a main steam flow numerical quantity substitutes into calculation method model and calculated, and is calculated
New main steam flow be updated in model again, until the last main steam flow being calculated and this be calculated newly
Main steam flow error stops iterative calculation less than 0.005%, and the main steam flow obtained at this time is final main steam flow.
By comparison, the data of main steam flow and live flow-through orifice measurement are coincide substantially, and precision can meet field demand.
The above is only a preferred embodiment of the present invention, it is not intended to restrict the invention, it is noted that for this skill
For the those of ordinary skill in art field, without departing from the technical principles of the invention, can also make it is several improvement and
Modification, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (2)
1. a kind of piping-main scheme back pressure turbine main steam flow calculation method characterized by comprising
Based on steam discharge enthalpy, according to flow and power balance equation, through iterating to calculate, so that the last main steam being calculated
Flow and this new main steam flow error being calculated arrive final main steam flow less than 0.005%.
2. a kind of piping-main scheme back pressure turbine main steam flow calculation method according to claim 1, which is characterized in that
The method specifically includes:
Based on main feedwater flow, heat regenerative system thermodynamic computing is carried out, each section of extraction flow is obtained；
According to the main steam flow of hypothesis, budget obtains door rod and shaft-packing leakage amount；
New main steam flow is obtained according to power balance equation based on each section of obtained extraction flow and door rod and shaft-packing leakage amount
Amount；
Main steam flow is recalculated using obtained new main steam flow as the main steam flow assumed, until last calculate
New main steam flow error is calculated less than 0.005% with this in obtained main steam flow, stops iterative calculation, at this time
The main steam flow arrived is final main steam flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810882925.1A CN109187036B (en) | 2018-08-06 | 2018-08-06 | Main steam flow calculation method of main pipe back pressure type steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810882925.1A CN109187036B (en) | 2018-08-06 | 2018-08-06 | Main steam flow calculation method of main pipe back pressure type steam turbine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109187036A true CN109187036A (en) | 2019-01-11 |
| CN109187036B CN109187036B (en) | 2020-09-22 |
Family
ID=64920196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810882925.1A Active CN109187036B (en) | 2018-08-06 | 2018-08-06 | Main steam flow calculation method of main pipe back pressure type steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109187036B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116402411A (en) * | 2023-06-09 | 2023-07-07 | 济南作为科技有限公司 | Consumption difference analysis method, device, equipment and storage medium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4035624A (en) * | 1972-04-26 | 1977-07-12 | Westinghouse Electric Corporation | System for operating a steam turbine with improved speed channel failure detection |
| JPS63117298A (en) * | 1986-11-05 | 1988-05-21 | 株式会社日立製作所 | Turbine controller |
| CN106761968A (en) * | 2017-02-16 | 2017-05-31 | 华电电力科学研究院 | Piping-main scheme back pressure turbine unit style shielding system and heat consumption rate method of testing |
| CN107368680A (en) * | 2017-07-14 | 2017-11-21 | 中国华能集团清洁能源技术研究院有限公司 | A kind of steam turbine optimum vacuum real-time computing technique |
-
2018
- 2018-08-06 CN CN201810882925.1A patent/CN109187036B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4035624A (en) * | 1972-04-26 | 1977-07-12 | Westinghouse Electric Corporation | System for operating a steam turbine with improved speed channel failure detection |
| JPS63117298A (en) * | 1986-11-05 | 1988-05-21 | 株式会社日立製作所 | Turbine controller |
| CN106761968A (en) * | 2017-02-16 | 2017-05-31 | 华电电力科学研究院 | Piping-main scheme back pressure turbine unit style shielding system and heat consumption rate method of testing |
| CN107368680A (en) * | 2017-07-14 | 2017-11-21 | 中国华能集团清洁能源技术研究院有限公司 | A kind of steam turbine optimum vacuum real-time computing technique |
Non-Patent Citations (8)
| Title |
|---|
| 余兴刚等: "汽轮机初终参数耗差分析与初压优化", 《中国电机工程学报》 * |
| 李勇: "凝汽式汽轮机相对内效率在线监测的一种近似计算方法", 《中国电机工程学报》 * |
| 李勇: "汽轮机主蒸汽流量在线监测方法研究", 《热力发电》 * |
| 李慧君等: "基于改进粒子群算法的汽轮机初、终参数优化算法", 《电力建设》 * |
| 李虹锐，王智微: "基于历史数据计算母管制机组各台汽轮机进汽流量的研究", 《中国电机工程学报》 * |
| 杨志平，杨勇平: "1 000 MW 汽轮机初参数能耗敏度分析", 《华东电力》 * |
| 陈宇卿: "百万超超临界汽轮机本体能效评价与诊断方法的研究", 《中国优秀硕士学位论文全文数据库工程科技II辑》 * |
| 韩中合: "在线确定凝汽式汽轮机排汽焓的热力学方法", 《动力工程》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116402411A (en) * | 2023-06-09 | 2023-07-07 | 济南作为科技有限公司 | Consumption difference analysis method, device, equipment and storage medium |
| CN116402411B (en) * | 2023-06-09 | 2024-05-14 | 济南作为科技有限公司 | Consumption difference analysis method, device, equipment and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109187036B (en) | 2020-09-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102967464B (en) | The improved method of evaluating performance of condensing turbine high back pressure | |
| CN108691585B (en) | Method for calculating low pressure cylinder efficiency of condensing steam turbine | |
| CN107201921B (en) | Steam turbine heat consumption rate online monitoring system and measuring method | |
| CN103048020B (en) | Main steam flow online calculation method of power station based on performance testing data | |
| CN110925037B (en) | Method for evaluating actual peak regulation capacity of heating heat supply unit by considering operation safety margin | |
| CN107543733A (en) | A kind of condenser duty on-line monitoring system and measuring method | |
| CN113719325B (en) | Improved method for variable back pressure characteristic test of steam turbine | |
| CN111079302A (en) | Low-pressure cylinder efficiency measuring and calculating system and method | |
| CN111047463A (en) | Peak regulation capacity evaluation method for heat supply unit after heat supply reconstruction by adopting low-temperature waste heat pump | |
| CN211454603U (en) | Low-pressure cylinder efficiency measuring and calculating system | |
| CN112507534B (en) | Conversion method and system for power supply coal consumption rate of cogeneration unit in heat supply period | |
| CN103776502B (en) | Fired power generating unit mesolow cylinder entrance reheat heat steam mass flow real time measure method | |
| CN111666675A (en) | Method for correcting and calculating thermal performance examination test of steam turbine with low-temperature economizer | |
| CN104483152B (en) | The heat consumption rate assay method of non-reheat backheat combined-circulation unit | |
| CN108446465A (en) | The method for decomposing online measuring and calculating fired power generating unit process steams amount by working medium | |
| CN111400875A (en) | Method and system for evaluating running economy of steam turbine set | |
| CN109932649A (en) | A kind of fired power generating unit generating efficiency monitoring method | |
| CN109187036A (en) | A kind of piping-main scheme back pressure turbine main steam flow calculation method | |
| CN109858810B (en) | Method for calculating pure condensation power generation heat consumption rate of steam turbine set under heat supply working condition | |
| CN105787195B (en) | Method for calculating steam inlet flow of external steam cooler in feedwater heating system | |
| CN109344423A (en) | A kind of calculation method for closing the practical IP efficiency of cylinder steam turbine | |
| CN106033496B (en) | Steam generator design margin calculation method | |
| CN106679747A (en) | On-line checking method for turbo-generator set boiler inlet feed water flow | |
| CN103954380A (en) | Determination method of steam turbine generator unit exhaust enthalpy | |
| CN111140293A (en) | Method for measuring steam leakage of balance disc of combined-cylinder steam turbine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |