CN104992265B - The appraisal procedure that firepower plant heating system valves leakage influences unit - Google Patents
The appraisal procedure that firepower plant heating system valves leakage influences unit Download PDFInfo
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- CN104992265B CN104992265B CN201510319775.XA CN201510319775A CN104992265B CN 104992265 B CN104992265 B CN 104992265B CN 201510319775 A CN201510319775 A CN 201510319775A CN 104992265 B CN104992265 B CN 104992265B
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Abstract
The invention discloses a kind of appraisal procedures that firepower plant heating system valves leakage influences unit, including：It determines the degree of supercooling of condenser condensed water, and calculates the supercooling angle value and Condenser Design or the hot-well depression angle value ψ of first period acceptance test of going into operation0Difference；Leaking heat in calculating；Interior leaking heat is set as to the steam heat of leakage, it is calculated and is converted into the amount of interior power；According to the heat consumption rate value under the ratio and the interior quantity of power of the amount of interior power and generator power, the incrementss of unit net coal consumption rate caused by calculating interior leakage；Days running d and mark coal price lattice γ per ton is leaked in statistics, calculates economic benefit.Advantageous effect of the present invention：The incrementss of unit net coal consumption rate caused by leakage in the calculating that can be quantified, and then internally leak and quantitative assessment is made that the influence of unit economy, to determine whether that carrying out valve transformation to unit provides theoretical foundation.
Description
Technical field
The present invention relates to a kind of appraisal procedures that firepower plant heating system valves leakage influences unit.
Background technology
The therrmodynamic system in thermal power plant is often referred to its comprehensive therrmodynamic system, is relative to design principle therrmodynamic system
For, compared with the principled thermal system for emphasizing economy, comprehensive therrmodynamic system in order to ensure unit starting, stopping,
Ensure unit safety in the case of load change, accident when normal operation, is provided with very more valves, makes unit safety and fortune
Row flexibility greatly improves.These valves according to it by working medium whether go out therrmodynamic system and can be divided into two classes, one kind is
System, referred to as leak outside valve, another kind of can not to be that system, mainly steam turbine side return to Condenser's Hot Well, referred to as interior
Leak valve.
For first kind valve, that is, the valve to leak outside can measure its quality by leak rate test, no longer in detail
Thin narration.The valve of interior leakage is then unable to measure, according to previous experiences, the influence of the valve of interior leakage to unit net coal consumption rate
It is larger, but due to can not be measured to it, influence of the valve for leading to not leak in quantitative measuring and calculating to unit economy,
Can not for whether to unit carry out valve transformation theory support is provided.
Invention content
The purpose of the present invention is exactly to solve the above-mentioned problems, to provide a kind of firepower plant heating system valves leakage pair
The appraisal procedure that unit influences, this method can quantitatively calculate influence of the interior leakage to unit net coal consumption rate, be Unit Economic
Property assessment provide reference frame.
To achieve the above object, the present invention uses following technical proposals：
A kind of appraisal procedure that firepower plant heating system valves leakage influences unit, includes the following steps：
Step 1：Unit condensing water temperature and the corresponding saturation temperature of exhaust steam pressure are acquired, determines condenser condensed water
Degree of supercooling, and calculate the supercooling angle value and Condenser Design or the hot-well depression angle value ψ of first period acceptance test of going into operation0's
Difference；
Step 2：The condensing water flow of Condenser's Hot Well is measured, interior leaking heat is calculated；
Step 3：Interior leaking heat is set as to the steam heat of leakage, it is calculated and is converted into the amount of interior power；
Step 4：According to the heat consumption rate value under the ratio and the interior quantity of power of the amount of interior power and generator power, meter
The incrementss of unit net coal consumption rate caused by leakage in calculating；
Step 5：Days running d and mark coal price lattice γ per ton is leaked in statistics, calculates economic benefit.
In the step 1, the determination method of the degree of supercooling ψ of condenser condensed water is specially：
ψ=ts-t；
Wherein, t is condensing water temperature, tsFor the corresponding saturation temperature of exhaust steam pressure.
In the step 2, the computational methods of interior leaking heat are specially：
Q1=cD Δs t；
Wherein, c is the specific heat of water, and D is condensing water flow, Δ t=ψ-ψ0, it is the degree of supercooling and condensing of condenser condensed water
Device designs or the difference of the hot-well depression angle value for period acceptance test of just going into operation.
In the step 3, the specific method for calculating the amount for being converted into interior power is：
Wherein, Q1For interior leaking heat, WrFor the amount of interior power.
In the step 4, the method for the incrementss of unit net coal consumption rate is specially caused by calculating interior leakage：
Wherein, WrFor the amount of interior power, W is generator power, HtFor the heat consumption rate under the generator power, ηglFor boiler
Efficiency, ηgdFor pipeline efficiency,For station service power consumption rate.
In the step 5, the method for calculating economic benefit is specially：
X=Δs g × d × 24 × W × γ/10^8；
Wherein, Δ g is the incrementss of unit net coal consumption rate caused by interior leakage, and d is interior leakage days running, and W is generator
Power, γ are the price of mark coal per ton.
The beneficial effects of the invention are as follows：
The incrementss of unit net coal consumption rate caused by leakage in the calculating that the present invention can quantify, and then internally leak to unit
The influence of economy is made that quantitative assessment, enables the advance fund funding of power plant's initial estimate valve transformation and the economy of transformation
Effect, to determine whether that carrying out valve transformation to unit provides theoretical foundation.
Description of the drawings
Fig. 1 is the method for the present invention flow chart.
Specific implementation mode
The following further describes the present invention with reference to the drawings.
The hydrophobic water cooling that is cooled in condenser of steam discharge, the low-pressure heater of turbine low pressure cylinder, condenses into water and collects
Into hot well, due to valve imprecision, leakage steam is directly pooled in Condenser's Hot Well in steam turbine pusher side, to condensed water
It is heated, enters low-pressure heater after boosting by condensate pump in the form of hot well exports condensed water.
The condensate undercooling of Condenser Design does not consider influence of the interior leaking heat to temperature rise of condensate generally.Therefore, it coagulates
The Wen Sheng born water needs to be calculated according to the condensate undercooling of actual measurement and the degree of supercooling of design.It is steamed due to being unable to measure interior leakage
The quality and enthalpy of vapour, the heat that the present invention is internally leaked rise to estimate by condensing water flow and temperature.
Flow passage component of the interior leaking heat from steam turbine makes power in steam turbine reduce, and generator active power reduces, hair
Electricity is reduced, and constant in circulation heat, unit heat consumption rate accordingly increases, due to station-service electricity, boiler efficiency, pipeline
Efficiency is constant, and corresponding net coal consumption rate increases, and since power supply volume is decided by user, when power supply volume is constant, coal consumption increases.
If investment undergoes technological transformation, valves leakage is eliminated, the heat of interior leakage is made to return to Turbine Flow Path, steamer
Power increases in machine, and generator active power increases, and station-service electricity, boiler efficiency, pipeline efficiency are constant, corresponding net coal consumption rate
It reduces, when power supply volume is constant, coal consumption reduces.The cost conversion of coal in power plant cost reduction, reduction is enterprise profit.
Therefore, interior leaking heat is determined to quantitatively calculate interior influence of the leakage for unit operation economy, Jin Erwei
Whether carry out valve transformation and theoretical foundation is provided.
The present invention proposes a kind of appraisal procedure that firepower plant heating system valves leakage influences unit, such as Fig. 1 institutes
Show, includes the following steps：
Step 1：Unit condensing water temperature and the corresponding saturation temperature of exhaust steam pressure are acquired, determines condenser condensed water
Degree of supercooling, and calculate the supercooling angle value and Condenser Design or the hot-well depression angle value ψ of first period acceptance test of going into operation0's
Difference；
The determination method of the degree of supercooling ψ of condenser condensed water is specially：
ψ=ts-t；
Wherein, t is condensing water temperature, tsFor the corresponding saturation temperature of exhaust steam pressure.
Step 2：The condensing water flow of Condenser's Hot Well is measured, interior leaking heat is calculated；
The computational methods of interior leaking heat are specially：
Q1=cD Δs t；
Wherein, c is the specific heat of water, and D is condensing water flow, Δ t=ψ-ψ0, it is the degree of supercooling and condensing of condenser condensed water
Device designs or the difference of the hot-well depression angle value for period acceptance test of just going into operation.
Step 3：Interior leaking heat is set as to the steam heat of leakage, it is calculated and is converted into the amount of interior power；
Calculating the specific method of amount for being converted into interior power is：
Wherein, Q1For interior leaking heat, WrFor the amount of interior power.
Step 4：According to the heat consumption rate value under the ratio and the interior quantity of power of the amount of interior power and generator power, meter
The incrementss of unit net coal consumption rate caused by leakage in calculating；
The method of the incrementss of unit net coal consumption rate is specially caused by leakage in calculating：
Wherein, WrFor the amount of interior power, W is generator power, HtFor the heat consumption rate under the generator power, ηglFor boiler
Efficiency, ηgdFor pipeline efficiency,For station service power consumption rate.
Step 5：Days running d and mark coal price lattice γ per ton is leaked in statistics, calculates economic benefit.
Calculate economic benefit method be specially：
X=Δs g × d × 24 × W × γ/10^8；
Wherein, Δ g is the incrementss of unit net coal consumption rate caused by interior leakage, and d is interior leakage days running, and W is generator
Power, γ are the price of mark coal per ton.
Test example：
Certain factory 300MW units, 75%THA operating modes Computer group Condenser's Hot Well is subcooled in thermal test before overhaul
Degree is ψ=- 2.08 DEG C, and the condensing water flow for going out hot well is D=604.707t/h, and it is t=to go out hot well condensing water temperature
27.38 DEG C, the degree of supercooling according to design condensed water is ψ0=1.2 DEG C, generator power W=250MW, unit heat consumption rate is Ht=
8192kJ/kW.h.Station service power consumption rateBoiler efficiency is ηgl=92.89%, pipeline efficiency is ηgd=99%, according to inspection
It looks into, all steam of valve of interior leakage, unit is run d=1200 days altogether, and unit average load rate is 75%, mark coal price lattice per ton
γ=550 yuan.
Interior leakage steam makes condensed water increase Δ t=ψ-ψ0=1.2-2.08=3.28 DEG C；
Interior leaking heat is Q1=cD Δs t=604.707 × 3.28 × 4.1868=8304.26MJ/h；
Interior leaking heat comes from Turbine Flow Path, and the work(as done less is：
Net coal consumption rate is set to increase：
Unit is run d=1200 days altogether, and unit average load rate is 75%, mark coal price lattice per ton γ=550 yuan/ton.
The more consumption mark coal costs estimated as unit of currency：
=Δ g × d × 24 × W × γ/10^8
=2.99 × 1200 × 24 × 250 × 550/10^8Wan Yuan
=118.404 ten thousand yuan
The cost of investment being transformed with valve in conjunction with the consumption mark coal cost of estimation, it is determined whether valve is transformed.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (2)
1. a kind of appraisal procedure that firepower plant heating system valves leakage influences unit, characterized in that including following step
Suddenly：
Step 1：Unit condensing water temperature and the corresponding saturation temperature of exhaust steam pressure are acquired, determines the supercooling of condenser condensed water
Degree, and calculate the supercooling angle value and Condenser Design or the hot-well depression angle value ψ of first period acceptance test of going into operation0Difference
Value；
Step 2：The condensing water flow of Condenser's Hot Well is measured, interior leaking heat is calculated；
Step 3：Interior leaking heat is set as to the steam heat of leakage, it is calculated and is converted into the amount of interior power；
Step 4：According to the heat consumption rate value under the ratio and the interior quantity of power of the amount of interior power and generator power, in calculating
The incrementss of unit net coal consumption rate caused by leakage；
Step 5：Days running d and mark coal price lattice γ per ton is leaked in statistics, calculates economic benefit；
In the step 1, the determination method of the degree of supercooling ψ of condenser condensed water is specially：
ψ=ts-t；
Wherein, t is condensing water temperature, tsFor the corresponding saturation temperature of exhaust steam pressure；
In the step 2, the computational methods of interior leaking heat are specially：
Q1=cD Δs t；
Wherein, c is the specific heat of water, and D is condensing water flow, Δ t=ψ-ψ0, set with condenser for the degree of supercooling of condenser condensed water
The difference of the hot-well depression angle value of meter or period acceptance test of just going into operation；
In the step 3, the specific method for calculating the amount for being converted into interior power is：
Wherein, Q1For interior leaking heat, WrFor the amount of interior power；
In the step 4, the method for the incrementss of unit net coal consumption rate is specially caused by calculating interior leakage：
Wherein, WrFor the amount of interior power, W is generator power, HtFor the heat consumption rate under the generator power, ηglFor boiler efficiency,
ηgdFor pipeline efficiency,For station service power consumption rate.
2. a kind of appraisal procedure that firepower plant heating system valves leakage influences unit as described in claim 1,
It is characterized in, in the step 5, the method for calculating economic benefit is specially：
X=Δs g × d × 24 × W × γ/10^8；
Wherein, Δ g is the incrementss of unit net coal consumption rate caused by interior leakage, and d is interior leakage days running, and W is generator power,
γ is the price of mark coal per ton.
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| CN103942732A (en) * | 2014-04-24 | 2014-07-23 | 国家电网公司 | Economic evaluation method of modification effects of heat supply technology of pure condensing steam turbine unit |
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| CN103942732A (en) * | 2014-04-24 | 2014-07-23 | 国家电网公司 | Economic evaluation method of modification effects of heat supply technology of pure condensing steam turbine unit |
Non-Patent Citations (4)
| Title |
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| "600MW超临界汽轮机热力性能诊断及供热分析";邓伟;《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》;20130715;第C042-621页 * |
| "电厂热力系统热经济性在线监测组态软件设计及计算模型";王萍;《中国优秀博硕士学位论文全文数据库 (硕士) 工程科技Ⅱ辑》;20050315;全文 * |
| "电厂热力系统设备性能监测与应用研究";苏晓静;《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》;20110915;全文 * |
| "电站机组运行优化指导系统平台设计";毕克;《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》;20090315;第C039-17页 * |
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Address after: 250003 No. 2000, Wang Yue Road, Shizhong District, Ji'nan, Shandong Patentee after: SHANDONG ELECTRIC POWER Research Institute Patentee after: STATE GRID CORPORATION OF CHINA Address before: 250003 No. 2000, Wang Yue Road, Shizhong District, Ji'nan, Shandong Patentee before: SHANDONG ELECTRIC POWER Research Institute Patentee before: State Grid Corporation of China |
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Effective date of registration: 20220127 Address after: 250003 No. 2000, Wang Yue Road, Shizhong District, Ji'nan, Shandong Patentee after: ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER Co. Patentee after: STATE GRID CORPORATION OF CHINA Address before: 250003 No. 2000, Wang Yue Road, Shizhong District, Ji'nan, Shandong Patentee before: SHANDONG ELECTRIC POWER Research Institute Patentee before: STATE GRID CORPORATION OF CHINA |
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