CN108760366A - The computational methods of heating steam in-pipe inspection robot acceptance evaluation heating power index - Google Patents
The computational methods of heating steam in-pipe inspection robot acceptance evaluation heating power index Download PDFInfo
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Abstract
The present invention relates to a kind of computational methods of heating steam in-pipe inspection robot acceptance evaluation heating power index, are used for Thermal Power Station.After heating steam in-pipe inspection robot, need to carry out delivery receiving acceptance and evaluation to jet chimney.Presently relevant specification and data are to the evaluation of heating network and check and accept and be mainly whether the insulation thickness of pipeline or the holder etc. of pipeline meet the requirements, and are related to some heating power indexs such as pressure drop, temperature drop, heat loss less.Heating steam in-pipe inspection robot acceptance evaluation heating power index includes that heating steam pipeline temperature drop, heating steam piping loss, heating steam pipe leakage rate and heating steam pipeline heat loss lead in the present invention；And provide the computational methods that heating steam pipeline temperature drop, heating steam piping loss, heating steam pipe leakage rate and heating steam pipeline heat loss lead, result of calculation can be compared with design value, and then be evaluated the thermal performance of heating steam pipeline.
Description
Technical field
The present invention relates to a kind of computational methods of heating steam in-pipe inspection robot acceptance evaluation heating power index, are used for thermal power generation
Factory.
Background technology
Many power plant are transformed unit, increase external heat supply, to increase economic benefit.In conjunction with power plant position and
At a distance from user, the heat supply of thermal power plant is transformed mostly in the form of heat supply pipeline, i.e., extracts out and steam from the setting extraction opening of unit
Vapour leads to user after excess pressure, temperature are adjusted by a jet chimney.
After heating steam in-pipe inspection robot, need to carry out delivery receiving acceptance and evaluation to jet chimney.
Presently relevant specification and data to the evaluation of heating network and check and accept be mainly pipeline insulation thickness or pipeline
Whether holder etc. meets the requirements, and is related to some heating power indexs such as pressure drop, temperature drop, heat loss less.And the jet chimney run,
It especially just goes into operation the stage, flow, pressure, temperature etc. are all difficult match with design value, and the calculating that can refer to of nothing and amendment side
Method can not evaluate the thermal performance for the jet chimney just gone into operation.
Invention content
It is an object of the invention to overcome above-mentioned deficiency existing in the prior art, and provide a kind of heat supply of reasonable design
Jet chimney check and acceptance evaluates the computational methods of heating power index, the meter of the heating steam in-pipe inspection robot acceptance evaluation heating power index
Calculation method can be compared with design value, and then be evaluated the thermal performance of heating steam pipeline.
Technical solution is used by the present invention solves the above problems：A kind of heating steam in-pipe inspection robot acceptance evaluation heating power
The computational methods of index, which is characterized in that heating steam in-pipe inspection robot acceptance evaluation heating power index includes heating steam pipeline temperature
Drop, heating steam piping loss, heating steam pipe leakage rate and heating steam pipeline heat loss lead；The heating steam pipeline
The computational methods that temperature drop, heating steam piping loss, heating steam pipe leakage rate and heating steam pipeline heat loss lead are as follows：
1) computational methods of heating steam pipeline temperature drop are as follows：
In formula：△ t are the unit temperature drop of steam pipe network, and unit is DEG C/km；t1For the origin temp of steam pipe network, unit
It is DEG C；t2For the outlet temperature of steam pipe network, unit is DEG C；L is jet chimney length, and unit is km；
Equation of heat balance group is established for steam pipeline section j：
Qjs=Qjys(1+β)
Qjs=Cjp(tjm-tjn)Gj
Qjys=qjcsLj/1000
The temperature drop of steam pipe network is obtained according to the above equation of heat balance group：
In formula：△tjFor the temperature drop of pipeline section j, unit is DEG C；QjsIt is lost for the steam heat of pipeline section j, unit is kJ；Qjys
It is lost for the steam heat dissipation capacity of pipeline section j, unit is kJ；β is local radiation loss correction factor, and value range is 0.2~0.8；
GjFor the interior steam flow of pipeline section j, unit is kg/s；tjmFor the initiating terminal temperature of pipeline section j, unit is DEG C；tjnFor the end of pipeline section j
Temperature is held, unit is DEG C；qjcsFor the unit length heat dissipation capacity of pipeline section j, unit is W/m；LjFor the length of pipeline section j, unit is m；
CjpFor the average specific heat at constant pressure of steam in pipeline section j, Cjp=(Cjm+Cjn)/2, unit are kJ/kg DEG C；
In formula：t0For vapor (steam) temperature in pipeline, unit is DEG C；taFor ambient temperature, unit is DEG C；λ is thermal insulation material
Thermal coefficient, unit is W/ (m DEG C)；D0For insulating layer outer diameter, unit is m；DiFor insulating layer internal diameter, unit is m；awFor
For external thermal insulation to the coefficient of heat transfer of air, unit is W/ (m2·℃)；
In formula：V is wind speed, and unit is m/s；
Then the temperature drop of amendment to another operating mode is：
In formula, aWind speedFor the correction factor of wind speed；aHeat conductionFor the correction factor of thermal insulation material；
2) computational methods of heating steam piping loss are as follows：
The calculation formula of the pressure drop of pipeline is as follows：
In formula：△ P are the unit pressure drop of steam pipe network, and unit is MPa/km；P1For the starting point pressure of steam pipe network, unit
It is MPa；P2For the terminal pressure of steam pipe network, unit is MPa；
On the other hand, steam pipe network pressure drop calculation formula is as follows：
In formula：ω is the average computation flow velocity of medium, and unit is m/s；ρ is the averag density of medium, and unit is kg/m3；λ
For coefficient of frictional resistance；D is internal diameter of the pipeline, and unit is mm；Σ ζ are the summation of coefficient of partial resistance；H1, H2 be respectively starting point,
The absolute altitude of terminal, unit are m, and jet chimney need not then be considered；1.15 being safety coefficient；
The pressure drop being then adapted under another operating mode is：
In formula：aλFor coefficient of frictional resistance correction factor；
3) computational methods of heating steam pipe leakage rate are as follows：
In formula：G is pipeline network leak rate；GiFlow is originated for pipe network, unit is kg/h；GjFor pipe network terminal flow, unit is
kg/h；
4) computational methods that heating steam pipeline heat loss leads are as follows：
In formula：Q is heating network heat loss rate；hiOriginate enthalpy for pipe network, unit is kJ/kg, by corresponding pressure and
Temperature computation；hjFor pipe network terminal enthalpy, unit is kJ/kg, is calculated by corresponding pressure and temperature；
The heat loss rate being adapted under another operating mode is：
In formula：qIt correctsFor heating network heat loss rate；GI is correctedFlow is originated to correct pipe network under operating mode, unit is kg/h；
hI is correctedEnthalpy is originated to correct pipe network under operating mode, unit is kJ/kg, is calculated by corresponding pressure and temperature；GJ is correctedTo correct operating mode
Lower pipe network terminal flow, unit is kg/h；hJ is correctedTo correct pipe network terminal enthalpy under operating mode, unit is kJ/kg, by pressing accordingly
Power and temperature computation.
Furthermore, the heating power index of jet chimney is for evaluating its heat loss；The heat loss of jet chimney includes three
Part, first part are in transmission process, due to heat loss caused by heat dissipation of pipeline；Second part is pipeline and attachment on the way
Caused by race emits, this heat loss enchancement factor is more, can not qualitatively calculate, and can only be estimated according to pipe network model rate；Third
Part is condensed water heat loss in heat exchange station.
Furthermore, in first part, in transmission process, since there are two types of shapes for heat loss caused by heat dissipation of pipeline
Formula；First, the reduction of steam enthalpy；Second is that heat dissipation of pipeline leads to occur condensed water on the way；When pipe network load is big, steam stream
Amount is big, then the condensed water generated is few；When pipe network load is small, steam flow is small, then the condensed water generated is more.
Furthermore, in second part, heat loss enchancement factor includes the construction quality, usage time, pipeline of pipeline
The many factors such as the tightness of attachment.
Furthermore, for simple steam heat-supply network, the heat loss of Part III is not present.
Compared with prior art, the present invention haing the following advantages and effect：The result of calculation energy of heating power index in the present invention
It is enough to be compared with design value, and then the thermal performance of heating steam pipeline is evaluated, give the delivery receiving acceptance of jet chimney
And the economic indicator evaluation during operation provides reference frame.Meanwhile the present invention overcomes the heat of jet chimney in the prior art
Difficulty possessed by power performance evaluation provides relatively reasonable, feasible method for the thermodynamic systems of jet chimney.
Specific implementation mode
Below by embodiment, the present invention is described in further detail, following embodiment be explanation of the invention and
The invention is not limited in following embodiments.
Embodiment.
A kind of computational methods of heating steam in-pipe inspection robot acceptance evaluation heating power index, which is characterized in that heating steam pipe
Road check and acceptance evaluation heating power index includes heating steam pipeline temperature drop, heating steam piping loss, heating steam pipe leakage
Rate and heating steam pipeline heat loss lead；The heating steam pipeline temperature drop, heating steam piping loss, heating steam pipeline are let out
The computational methods that leak rate and heating steam pipeline heat loss lead are as follows：
1) computational methods of heating steam pipeline temperature drop are as follows：
In formula：△ t are the unit temperature drop of steam pipe network, and unit is DEG C/km；t1For the origin temp of steam pipe network, unit
It is DEG C；t2For the outlet temperature of steam pipe network, unit is DEG C；L is jet chimney length, and unit is km；
Equation of heat balance group is established for steam pipeline section j：
Qjs=Qjys(1+β)
Qjs=Cjp(tjm-tjn)Gj
Qjys=qjcsLj/1000
The temperature drop of steam pipe network is obtained according to the above equation of heat balance group：
In formula：△tjFor the temperature drop of pipeline section j, unit is DEG C；QjsIt is lost for the steam heat of pipeline section j, unit is kJ；Qjys
It is lost for the steam heat dissipation capacity of pipeline section j, unit is kJ；β is local radiation loss correction factor, and value range is 0.2~0.8；
GjFor the interior steam flow of pipeline section j, unit is kg/s；tjmFor the initiating terminal temperature of pipeline section j, unit is DEG C；tjnFor the end of pipeline section j
Temperature is held, unit is DEG C；qjcsFor the unit length heat dissipation capacity of pipeline section j, unit is W/m；LjFor the length of pipeline section j, unit is m；
CjpFor the average specific heat at constant pressure of steam in pipeline section j, Cjp=(Cjm+Cjn)/2, unit are kJ/kg DEG C；
In formula：t0For vapor (steam) temperature in pipeline, unit is DEG C；taFor ambient temperature, unit is DEG C；λ is thermal insulation material
Thermal coefficient, unit is W/ (m DEG C)；D0For insulating layer outer diameter, unit is m；DiFor insulating layer internal diameter, unit is m；awFor
For external thermal insulation to the coefficient of heat transfer of air, unit is W/ (m2·℃)；
In formula：V is wind speed, and unit is m/s；
Then the temperature drop of amendment to another operating mode is：
In formula, aWind speedFor the correction factor of wind speed；aHeat conductionFor the correction factor of thermal insulation material；
2) computational methods of heating steam piping loss are as follows：
The calculation formula of the pressure drop of pipeline is as follows：
In formula：△ P are the unit pressure drop of steam pipe network, and unit is MPa/km；P1For the starting point pressure of steam pipe network, unit
It is MPa；P2For the terminal pressure of steam pipe network, unit is MPa；
On the other hand, steam pipe network pressure drop calculation formula is as follows：
In formula：ω is the average computation flow velocity of medium, and unit is m/s；ρ is the averag density of medium, and unit is kg/m3；λ
For coefficient of frictional resistance；D is internal diameter of the pipeline, and unit is mm；Σ ζ are the summation of coefficient of partial resistance；H1, H2 be respectively starting point,
The absolute altitude of terminal, unit are m, and jet chimney need not then be considered；1.15 being safety coefficient；
The pressure drop being then adapted under another operating mode is：
In formula：aλFor coefficient of frictional resistance correction factor；
3) computational methods of heating steam pipe leakage rate are as follows：
In formula：G is pipeline network leak rate；GiFlow is originated for pipe network, unit is kg/h；GjFor pipe network terminal flow, unit is
kg/h；
4) computational methods that heating steam pipeline heat loss leads are as follows：
In formula：Q is heating network heat loss rate；hiOriginate enthalpy for pipe network, unit is kJ/kg, by corresponding pressure and
Temperature computation；hjFor pipe network terminal enthalpy, unit is kJ/kg, is calculated by corresponding pressure and temperature；
The heat loss rate being adapted under another operating mode is：
In formula：qIt correctsFor heating network heat loss rate；GI is correctedFlow is originated to correct pipe network under operating mode, unit is kg/h；
hI is correctedEnthalpy is originated to correct pipe network under operating mode, unit is kJ/kg, is calculated by corresponding pressure and temperature；GJ is correctedTo correct operating mode
Lower pipe network terminal flow, unit is kg/h；hJ is correctedTo correct pipe network terminal enthalpy under operating mode, unit is kJ/kg, by pressing accordingly
Power and temperature computation.
The heating power index of jet chimney is for evaluating its heat loss；The heat loss of jet chimney includes three parts：
First part is in transmission process, and due to heat loss caused by heat dissipation of pipeline, there are two types of forms；First, steam enthalpy
The reduction of value；Second is that heat dissipation of pipeline leads to occur condensed water on the way；When pipe network load is big, steam flow is big, then generates
Condensed water is few；When pipe network load is small, steam flow is small, then the condensed water generated is more.
Second part be on the way pipeline and attachment race emit caused by, this heat loss enchancement factor is more, can not qualitatively count
It calculates, can only be estimated according to pipe network model rate；Part III is condensed water heat loss in heat exchange station.
In second part, heat loss enchancement factor includes the construction quality, usage time, the tightness of conduit fittings of pipeline
This is not present for simple steam heat-supply network in equal many factors.
Although the present invention is disclosed as above with embodiment, it is not limited to protection scope of the present invention, any to be familiar with
The technical staff of this technology changes and retouches made by without departing from the spirit and scope of the invention, should all belong to this hair
Bright protection domain.
Claims (5)
1. a kind of computational methods of heating steam in-pipe inspection robot acceptance evaluation heating power index, which is characterized in that heating steam pipeline
It includes heating steam pipeline temperature drop, heating steam piping loss, heating steam pipe leakage rate that check and acceptance, which evaluates heating power index,
Pipeline heat loss leads with heating steam；The heating steam pipeline temperature drop, heating steam piping loss, heating steam pipe leakage
The computational methods that rate and heating steam pipeline heat loss lead are as follows：
1) computational methods of heating steam pipeline temperature drop are as follows：
In formula：△ t are the unit temperature drop of steam pipe network, and unit is DEG C/km；t1For the origin temp of steam pipe network, unit is DEG C；
t2For the outlet temperature of steam pipe network, unit is DEG C；L is jet chimney length, and unit is km；
Equation of heat balance group is established for steam pipeline section j：
Qjs=Qjys(1+β)
Qjs=Cjp(tjm-tjn)Gj
Qjys=qjcsLj/1000
The temperature drop of steam pipe network is obtained according to the above equation of heat balance group：
In formula：△tjFor the temperature drop of pipeline section j, unit is DEG C；QjsIt is lost for the steam heat of pipeline section j, unit is kJ；QjysFor pipe
The steam heat dissipation capacity loss of section j, unit is kJ；β is local radiation loss correction factor, and value range is 0.2~0.8；GjFor
The interior steam flow of pipeline section j, unit are kg/s；tjmFor the initiating terminal temperature of pipeline section j, unit is DEG C；tjnFor the terminal of pipeline section j
Temperature, unit are DEG C；qjcsFor the unit length heat dissipation capacity of pipeline section j, unit is W/m；LjFor the length of pipeline section j, unit is m；Cjp
For the average specific heat at constant pressure of steam in pipeline section j, Cjp=(Cjm+Cjn)/2, unit are kJ/kg DEG C；
In formula：t0For vapor (steam) temperature in pipeline, unit is DEG C；taFor ambient temperature, unit is DEG C；λ is leading for thermal insulation material
Hot coefficient, unit are W/ (m DEG C)；D0For insulating layer outer diameter, unit is m；DiFor insulating layer internal diameter, unit is m；awFor outer guarantor
For warm layer to the coefficient of heat transfer of air, unit is W/ (m2·℃)；
In formula：V is wind speed, and unit is m/s；
Then the temperature drop of amendment to another operating mode is：
In formula, aWind speedFor the correction factor of wind speed；aHeat conductionFor the correction factor of thermal insulation material；
2) computational methods of heating steam piping loss are as follows：
The calculation formula of the pressure drop of pipeline is as follows：
In formula：△ P are the unit pressure drop of steam pipe network, and unit is MPa/km；P1For the starting point pressure of steam pipe network, unit is
MPa；P2For the terminal pressure of steam pipe network, unit is MPa；
On the other hand, steam pipe network pressure drop calculation formula is as follows：
In formula：ω is the average computation flow velocity of medium, and unit is m/s；ρ is the averag density of medium, and unit is kg/m3；λ is to rub
Wipe resistance coefficient；D is internal diameter of the pipeline, and unit is mm；Σ ζ are the summation of coefficient of partial resistance；H1, H2 are respectively starting point, terminal
Absolute altitude, unit is m, and jet chimney need not then be considered；1.15 being safety coefficient；
The pressure drop being then adapted under another operating mode is：
In formula：aλFor coefficient of frictional resistance correction factor；
3) computational methods of heating steam pipe leakage rate are as follows：
In formula：G is pipeline network leak rate；GiFlow is originated for pipe network, unit is kg/h；GjFor pipe network terminal flow, unit is kg/
h；
4) computational methods that heating steam pipeline heat loss leads are as follows：
In formula：Q is heating network heat loss rate；hiEnthalpy is originated for pipe network, unit is kJ/kg, by corresponding pressure and temperature meter
It calculates；hjFor pipe network terminal enthalpy, unit is kJ/kg, is calculated by corresponding pressure and temperature；
The heat loss rate being adapted under another operating mode is：
In formula：qIt correctsFor heating network heat loss rate；GI is correctedFlow is originated to correct pipe network under operating mode, unit is kg/h；hI is correctedFor
It corrects pipe network under operating mode and originates enthalpy, unit is kJ/kg, is calculated by corresponding pressure and temperature；GJ is correctedTo correct operating mode down tube
Net terminal flow, unit are kg/h；hJ is correctedTo correct pipe network terminal enthalpy under operating mode, unit is kJ/kg, by corresponding pressure and
Temperature computation.
2. the computational methods of heating steam in-pipe inspection robot acceptance evaluation heating power index according to claim 1, feature exist
In the heating power index of jet chimney is for evaluating its heat loss；The heat loss of jet chimney includes three parts, first part be
In transmission process, due to heat loss caused by heat dissipation of pipeline；Second part be on the way pipeline and attachment race emit caused by, this heat
It is more to lose enchancement factor, can not qualitatively calculate, can only be estimated according to pipe network model rate；Part III is condensation in heat exchange station
Hydro-thermal is lost.
3. the computational methods of heating steam in-pipe inspection robot acceptance evaluation heating power index according to claim 2, feature exist
In in first part, in transmission process, since there are two types of forms for heat loss caused by heat dissipation of pipeline；When steam enthalpy
It reduces；Second is that heat dissipation of pipeline leads to occur condensed water on the way；When pipe network load is big, steam flow is big, then the condensation generated
Water is few；When pipe network load is small, steam flow is small, then the condensed water generated is more.
4. the computational methods of heating steam in-pipe inspection robot acceptance evaluation heating power index according to claim 2, feature exist
In in second part, heat loss enchancement factor includes the construction quality of pipeline, the tightness of usage time and conduit fittings.
5. the computational methods of heating steam in-pipe inspection robot acceptance evaluation heating power index according to claim 2, feature exist
In for simple steam heat-supply network, there is no the heat loss of Part III.
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| CN113837565A (en) * | 2021-09-07 | 2021-12-24 | 浙江浙能技术研究院有限公司 | Steam heat network water hammer risk assessment system and method based on condensation coefficient |
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| CN114216713A (en) * | 2021-12-15 | 2022-03-22 | 浙江浙能技术研究院有限公司 | Comprehensive detection and evaluation system and method for heat dissipation characteristics of overhead steam heat supply network |
| CN115795766A (en) * | 2022-12-28 | 2023-03-14 | 南京苏夏设计集团股份有限公司 | Steam pipe network simulation calculation method, storage medium and equipment |
| CN115795766B (en) * | 2022-12-28 | 2023-09-12 | 南京苏夏设计集团股份有限公司 | Steam pipe network simulation calculation method, storage medium and equipment |
| CN116108640A (en) * | 2022-12-28 | 2023-05-12 | 南京苏夏设计集团股份有限公司 | Steam pipe network temperature drop calculation method, storage medium and equipment |
| CN116108640B (en) * | 2022-12-28 | 2023-09-19 | 南京苏夏设计集团股份有限公司 | Steam pipe network temperature drop calculation method, storage medium and equipment |
| CN115936450A (en) * | 2023-03-15 | 2023-04-07 | 南京华助智能科技有限公司 | Loss diagnosis method and system for steam heating system pipeline |
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