CN106066937B - It is a kind of using heat-conduction oil heat as the forming machine hot blast temperature evaluation method of heat source - Google Patents
It is a kind of using heat-conduction oil heat as the forming machine hot blast temperature evaluation method of heat source Download PDFInfo
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Abstract
The invention discloses a kind of using heat-conduction oil heat as the forming machine hot blast temperature evaluation method of heat source, the present invention by Analysis on Mechanism and it is actually detected be combined by way of, the measurement links of some temperature, accurate acquisition hot-air t can be saved2Value provide strong technical support to reduce the hardware cost in forming machine for forming machine quality of shaping.
Description
Technical field
The present invention relates to field of industrial automatic control, are related to a kind of heat exchanger modeling method of heat setting machine.
Background technology
Type-approval process in dyeing is that embryo cloth to be shaped is soaked upper chemical industry material in hopper, is uniformly squeezed by roll
Afterwards, into baking oven, the drying and shaping under high-temperature hot-air effect.Pass through the feel that can improve fabric, sliding, color, the width of shaping
Width, strength, appearance also act as the effect of stable dimensions, are an essential procedures in textile industry.
Forming machine is a textile equipment bulky, complicated, with great energy consumption, including material loading part, whole
The devices such as latitude device, chain, oven body and cropping batching.Forming machine complicated integral structure is generally dried by nine grades by taking oven body as an example
Case concatenates, and single-stage baking oven length is at 3 meters or so, mainly by nozzle 3, filter screen, circulating fan 2, heat exchanger 1, exhaust
Device 4 and corresponding mechanism composition, schematic diagram are as shown in Figure 1.In control, most important parameter is exactly the temperature shaped, fixed
The temperature of type is the hot blast temperature that fabric to be shaped is received in forming machine.
The generation of hot wind is such a process.Conduction oil is generated by main boiler, is sent on board by supervisor, then pass through
It crosses branch pipe entrance and often saves drying chamber.After entering drying chamber, conduction oil is flowed by deep fat type radiator.The radiator is a kind of
Novel heat-exchanger rig, it uses steel-aluminum composite fin tube with excellent technique performance and to compensate the floating head of thermal stress
Formula structure, therefore, it is that heat transfer medium carries out air heating heat exchange dress that it, which is with conduction oil (also referred to as organic heat carrier or hot media),
The optimal selection set.In recent years, the radiator is in weaving, printing and dyeing, rubber, process hides, timber processing, oil and foodstuffs processing, application
It has been widely applied in the industries such as baking vanish, has obtained satisfied effect.
At this stage, domestic forming machine is in terms of temperature measurement, other than placing sensor device inside heat conducting oil pipe,
Also it arranges temperature sensor in forming machine drying chamber, with the temperature of drying chamber come the approximate temperature come out from nozzle with waiting for, causes
Larger deviation causes actual product fixed effect bad；Secondly as not knowing about the flow of conduction oil in forming machine, air
And can the correspondence of temperature be related to, cannot establish effective mathematical model well, can only generally rely on insensitive to model
Pid algorithm adjusts the flow and hot wind air quantity of deep fat, and control difficulty is big, and pid parameter adjusts difficulty, therefore often generates two
A result：1, temperature control precision is poor；2, utilization efficiency of heat energy is low, and energy consumption is big.
Invention content
In view of the above-mentioned problems, the present invention provides a kind of using heat-conduction oil heat as the forming machine hot blast temperature estimation side of heat source
Method so that data input/output relation is clear, and corresponding control, which is realized, to be easy.
Technical solution provided by the invention is：
It is a kind of using heat-conduction oil heat as the forming machine hot blast temperature evaluation method of heat source, include the following steps：1) by conduction oil
Shell-and-tube heat exchanger is imported, makes it in the internal circulation of shell-and-tube heat exchanger, external stream of the circulation air in shell-and-tube heat exchanger
It is logical, it is recycled by the circulating fan of hot wind, according to heat conservation law, can be obtained：
Q=ρoiluoilCoil(T1-T2) (1)
Q=ρairuairCair(t2-t1) (2)
Here symbol ρ indicates that density, u indicate flow, and that C is represented is specific heat, T1It is the oil temperature of the conduction oil flowed into, T2
It is the temperature of the conduction oil after heat exchanger, t1It is the air temperature of inflow heat exchanger, t2It is the hot-air after heat exchanger
Temperature；
2) shell-and-tube heat exchanger, in the whole process conduction oil do not undergo phase transition, done in pipe force turbulent convection heat transfer,
Make horizontal stagger arrangement circle fin of plunderring in extratubal fluid and restrain heat convection, the heat transfer of entire heat exchanger is divided into three bulks：1, shell
Journey；2, tube side；3, septate heat transfer；
Therefore, total coefficient of heat transfer be shell side, tube side, septate heat transfer three parts composition, can with following expression formula into
Row indicates：
A in formula0--- extratubal fluid film coefficient of heat transfer, W/ (m2 DEG C)；
ai--- tube fluid film coefficient of heat transfer, W/ (m2 DEG C)；
r0, ri--- respectively manage outer, tube fluid dirtiness resistance, (m2 DEG C)/W；
A0, Ai--- the appearance of heat exchanger tube, interior table heat transfer area, m2；
Am--- the average heat transfer area in Tube Sheet of Heat Exchanger and outside pipe, m2；
δ --- pipe thickness, m；
λ2--- the thermal coefficient of pipe wall material, W/ (m DEG C),
Herein, the first item on the right of equation in addition is the shell side coefficient of heat transfer, and Section 2 is the tube side coefficient of heat transfer, third
Item is septate heat transfer coefficient；Last is the coefficient of heat transfer of dirt；
First item shell side does convective motion, and air exchanges heat with fin tube bank, but does not have phase transformation, is determined by experiment,
And existing theory is compared, it can derive following relationship：
a0=c ε Re0.65Pr0.4=k1uair 0.65 (4)
Here,
Wherein c represents specific heat, and ε represents pipe number of rows correction factor, and Re is conduction oil Reynolds number, wairIt is air velocity, dwIt is
The outer diameter of heat exchanger tube, vairThe kinematic viscosity of air under qualitative temperature, Pr are that Prandtl number is also constant.Therefore w is removedair
Outside, other are all constant, flow direct ratio and flow velocity, therefore a0Direct ratio with
That is,
a0=k1uair 0.65 (5)
k1Value can be determined by way of experiment.
Corresponding Section 2 is the case where conduction oil flows in shell, therefore is also the process of a heat convection, equivalent
It is forced to the exothermic quasi- numbers of Nu Xieerte of turbulent flow in conduction oil in pipe：
Wherein,
Here Re is conduction oil Reynolds number, woilIt is the outer air velocity of pipe, dnIt is the internal diameter of heat exchanger tube, voilQualitative temperature
The kinematic viscosity of the lower conduction oil of degree, dn、voilAll it is constant when forming machine is run, Pr is that Prandtl number is also constant, in addition to
Heat conduction oil flow rate is outside variable, other can be seen as constant, therefore a in the calculationiDirect ratio with
It obtains,
k2Value can be determined by way of experiment,
And in Section 3, area design of heat exchanger got well after just it has been determined that wherein the coefficient of heat transfer of dirt than
Longer time section can be considered as a constant, and back two can be considered as a unified entirety in (3), can pass through experiment
Method be measured；
Based on this
Here k3Represent the Composite Walls of dirt and partition；The case where above-mentioned two is derived substitutes into, here face
The relevant coefficient of correspondence k of product4It replaces, so as to obtain：
In forming machine, the basic mode of the heat exchange of air is the mode of distributary, therefore the heat Q arranged can also be write
At following form：
Here K indicates that total coefficient of heat transfer, A are exchange areas, finds (T in practice1-t2)/(T2-t1)≤2, because
The logarithm temperature form of expression can be approached with arithmetic mean of instantaneous value once here for this, and such processing accuracy difference is not
Greatly, it is as follows to approach rear form for the difficulty that calculating greatly reduces：
Therefore
From expression formula (1) and (2), can derive
It can be derived by expression formula (1) and (12) again
(13) are substituted into (14), can be obtained
To obtain the hot air temperature t of the ejection of the slave hot-blast spray nozzle after heat exchanger2。
The present invention by Analysis on Mechanism and it is actually detected be combined by way of, the measurement ring of some temperature can be saved
Section, accurate acquisition hot-air t2Value, to reduce the hardware cost in forming machine, for forming machine shape quality promotion
Provide strong technical support.
For the angle of control, if by air mass flow uair, conduction oil uoilFlow can be regarded as Constant control, K
For constant, it will substantially reduce the difficulty of control, be also conducive to promote the available accuracy of control.
Description of the drawings
Fig. 1 is the single-unit oven structure schematic diagram of the present invention.
Specific implementation mode
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
It is a kind of using heat-conduction oil heat as the forming machine hot blast temperature evaluation method of heat source, include the following steps：1) by conduction oil
Shell-and-tube heat exchanger 1 is imported, makes it in the internal circulation of shell-and-tube heat exchanger 1, circulation air is in the outside of shell-and-tube heat exchanger 1
Circulation, is recycled by the circulating fan 2 of hot wind, according to heat conservation law, can be obtained：
Q=ρoiluoilCoil(T1-T2) (1)
Q=ρairuairCair(t2-t1) (2)
Here symbol ρ indicates that density, u indicate flow, and what C was represented is specific heat, i.e. ρoilIndicate the density of conduction oil, ρair
Indicate the density of air, uoilIndicate the flow of conduction oil, uairIndicate the flow of air, CoilIndicate the specific heat of conduction oil, Cair
Indicate the specific heat of air, T1It is the oil temperature of the conduction oil flowed into, T2It is the temperature of the conduction oil after heat exchanger, t1It is to flow into change
The air temperature of hot device, t2It is the hot air temperature after heat exchanger, Q indicates heat；
2) shell-and-tube heat exchanger, in the whole process conduction oil do not undergo phase transition, done in pipe force turbulent convection heat transfer,
Make horizontal stagger arrangement circle fin of plunderring in extratubal fluid and restrain heat convection, the heat transfer of entire heat exchanger is divided into three bulks：1, shell
Journey；2, tube side；3, septate heat transfer；
Therefore, total coefficient of heat transfer be shell side, tube side, septate heat transfer three parts composition, can with following expression formula into
Row indicates：
A in formula0--- extratubal fluid film coefficient of heat transfer, W/ (m2 DEG C)；
ai--- tube fluid film coefficient of heat transfer, W/ (m2 DEG C)；
r0, ri--- respectively manage outer, tube fluid dirtiness resistance, (m2 DEG C)/W；
A0, Ai--- the appearance of heat exchanger tube, interior table heat transfer area, m2；
Am--- the average heat transfer area in Tube Sheet of Heat Exchanger and outside pipe, m2；
δ --- pipe thickness, m；
λ2--- the thermal coefficient of pipe wall material, W/ (m DEG C),
Herein, the first item on the right of equation in addition is the shell side coefficient of heat transfer, and Section 2 is the tube side coefficient of heat transfer, third
Item is septate heat transfer coefficient；Last is the coefficient of heat transfer of dirt；
First item shell side does convective motion, and air exchanges heat with fin tube bank, but does not have phase transformation, is determined by experiment,
And existing theory is compared, it can derive following relationship：
a0=c ε Re0.65Pr0.4=k1uair 0.65 (4)
Here,
Wherein c represents specific heat, and ε represents pipe number of rows correction factor, and Re is conduction oil Reynolds number, wairIt is air velocity, dwIt is
The outer diameter of heat exchanger tube, vairThe kinematic viscosity of air under qualitative temperature, Pr are that Prandtl number is also constant, therefore removes wair
Outside, other are all constant, flow direct ratio and flow velocity, therefore a0Direct ratio with
That is,
a0=k1uair 0.65 (5)
k1Value can be determined by way of experiment；
Corresponding Section 2 is the case where conduction oil flows in shell, therefore is also the process of a heat convection, equivalent
It is forced to the exothermic quasi- numbers of Nu Xieerte of turbulent flow in conduction oil in pipe：
Wherein,
Here Re is conduction oil Reynolds number, woilIt is the outer air velocity of pipe, dnIt is the internal diameter of heat exchanger tube, voilQualitative temperature
The kinematic viscosity of the lower conduction oil of degree, dn、voilAll it is constant when forming machine is run, Pr is that Prandtl number is also constant, in addition to
Heat conduction oil flow rate is outside variable, other can be seen as constant, therefore a in the calculationiDirect ratio with
It obtains,
k2Value can be determined by way of experiment；
And in Section 3, area design of heat exchanger got well after just it has been determined that wherein the coefficient of heat transfer of dirt than
Longer time section can be considered as a constant, and back two can be considered as a unified entirety in (3), can pass through experiment
Method be measured；
Based on this
Here k3Represent the Composite Walls of dirt and partition；The case where above-mentioned two is derived substitutes into, here face
The relevant coefficient of correspondence k of product4It replaces, so as to obtain：
In forming machine, the basic mode of the heat exchange of air is the mode of distributary, therefore the heat Q arranged can also be write
At following form：
Here K indicates that total coefficient of heat transfer, A are exchange areas, finds (T in practice1-t2)/(T2-t1)≤2, because
The logarithm temperature form of expression can be approached with arithmetic mean of instantaneous value once here for this, and such processing accuracy difference is not
Greatly, it is as follows to approach rear form for the difficulty that calculating greatly reduces：
Therefore
From expression formula (1) and (2), can derive
It can be derived by expression formula (1) and (12) again
(13) are substituted into (14), can be obtained
To obtain the hot air temperature t of the ejection of the slave hot-blast spray nozzle after heat exchanger2。
The present invention keeps the flow of conduction oil, air to remain unchanged, therefore obtain the temperature of hot wind during implementation
Estimation mode, i.e. relational expression 15.
Here, T1, T2It is the temperature of conduction oil, placement sensor can be relatively easy to measure in the pipeline of circulation,
Middle t1It is the temperature for flowing into air, t here2It is the temperature of the heating air contacted with cloth, i.e., the slave heat after heat exchanger
The hot air temperature that wind nozzle 3 sprays.Two gas temperatures detect all more difficult installation in real process, and present forming machine is real
It is typically all to fill a temperature sensor at the top of forming machine baking oven in the processing procedure of border, replaces out with this stabilization
Hot wind air themperature causes certain temperature deviation that fixed effect can be caused bad, and the present invention passes through Analysis on Mechanism and reality
The mode combined is wanted in detection, to obtain about t2Expression formula, can accurate acquisition in the case of not placement sensor
Hot-air t2Value, provide strong technical support for forming machine quality of shaping.
Claims (1)
1. a kind of using heat-conduction oil heat as the forming machine hot blast temperature evaluation method of heat source, which is characterized in that include the following steps：1)
Conduction oil is imported into shell-and-tube heat exchanger, makes it in the internal circulation of shell-and-tube heat exchanger, circulation air is in shell-and-tube heat exchanger
External circulation, recycled by the circulating fan of hot wind, according to heat conservation law, can be obtained：
Q=ρoiluoilCoil(T1-T2) (1)
Q=ρairuairCair(t2-t1) (2)
Here symbol ρ indicates that density, u indicate flow, and that C is represented is specific heat, T1It is the oil temperature of the conduction oil flowed into, T2Be through
Cross the temperature of conduction oil after heat exchanger, t1It is the air temperature of inflow heat exchanger, t2It is the hot-air temperature after heat exchanger
Degree；
2) shell-and-tube heat exchanger, in the whole process conduction oil do not undergo phase transition, done in pipe force turbulent convection heat transfer, in pipe
Outer fluid makees horizontal stagger arrangement circle fin of plunderring and restrains heat convection, and the heat transfer of entire heat exchanger is divided into three bulks：1, shell side；2,
Tube side；3, septate heat transfer；
Therefore, total coefficient of heat transfer is shell side, tube side, septate heat transfer three parts composition, can carry out table with following expression formula
Show：
A in formula0--- extratubal fluid film coefficient of heat transfer,
ai--- tube fluid film coefficient of heat transfer,
r0, ri--- outer, tube fluid dirtiness resistance is respectively managed,
A0, Ai--- the appearance of heat exchanger tube, interior table heat transfer area,
Am--- the average heat transfer area in Tube Sheet of Heat Exchanger and outside pipe,
δ --- pipe thickness,
λ2--- the thermal coefficient of pipe wall material,
Herein, the first item on the right of equation in addition is the shell side coefficient of heat transfer, and Section 2 is the tube side coefficient of heat transfer, and Section 3 is
Septate heat transfer coefficient；Last is the coefficient of heat transfer of dirt；
First item shell side does convective motion, and air exchanges heat with fin tube bank, but does not have phase transformation, is determined by experiment, and right
Than existing theory, following relationship can be derived：
a0=c ε Re0.65Pr0.4=k1uair 0.65 (4)
Here,
Wherein c represents specific heat, and ε represents pipe number of rows correction factor, and Re is conduction oil Reynolds number, wairIt is air velocity, dwIt is heat exchange
The outer diameter of device pipe, vairThe kinematic viscosity of air under qualitative temperature, Pr are that Prandtl number is also constant, therefore removes wairOutside,
Other are all constants, and flow is proportional to flow velocity, therefore a0It is proportional to
That is,
a0=k1uair 0.65 (5)
k1Value can be determined by way of experiment；
Corresponding Section 2 is the case where conduction oil flows in shell, therefore is also the process of a heat convection, is equal to pipe
Interior conduction oil is forced to the exothermic quasi- numbers of Nu Xieerte of turbulent flow：
Wherein,
Here Re is conduction oil Reynolds number, woilIt is the outer air velocity of pipe, dnIt is the internal diameter of heat exchanger tube, voilUnder qualitative temperature
The kinematic viscosity of conduction oil, dn、voilAll it is constant when forming machine is run, Pr is that Prandtl number is also constant, in addition to heat conduction
Oil flow rate is outside variable, other can be seen as constant, therefore a in the calculationiIt is proportional to
It obtains,
k2Value can be determined by way of experiment；
And in Section 3, area is after design of heat exchanger has been got well just it has been determined that wherein the coefficient of heat transfer of dirt is long
Period can be considered as a constant, in (3) below two can be considered as a unified entirety, the side of experiment can be passed through
Method is measured；
Based on this
Here k3Represent the Composite Walls of dirt and partition；The case where above-mentioned two is derived substitutes into, here area correlation
With coefficient of correspondence k4It replaces, so as to obtain：
In forming machine, the basic mode of the heat exchange of air is the mode of distributary, thus the heat Q arranged can also be written to as
Lower form：
Here K indicates that total coefficient of heat transfer, A are exchange areas, finds (T in practice1-t2)/(T2-t1)≤2, therefore here
It can be approached with arithmetic mean of instantaneous value below in face of several temperature forms of expression, it is as follows to approach rear form：
Therefore
From expression formula (1) and (2), can derive
It can be derived by expression formula (1) and (12) again
(13) are substituted into (14), can be obtained
To obtain the hot air temperature t of the ejection of the slave hot-blast spray nozzle after heat exchanger2。
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| CN108692608A (en) * | 2018-07-05 | 2018-10-23 | 深圳市宏事达能源科技有限公司 | A kind of heat exchanger operation conditions intelligent on-line monitoring device |
| CN113190924B (en) * | 2021-03-26 | 2024-01-23 | 中煤鄂尔多斯能源化工有限公司 | Modeling and scaling analysis method and system for circulating water system of coal chemical industry enterprise |
| CN116928886B (en) * | 2023-09-14 | 2023-12-29 | 济宁康盛彩虹生物科技有限公司 | Chemical industry conduction oil stove safety supervision system based on multivariable |
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|---|---|---|---|---|
| CN102436185A (en) * | 2011-11-08 | 2012-05-02 | 浙江理工大学 | Modeling method for heat exchanger of heat-setting machine |
| CN102517834A (en) * | 2011-12-06 | 2012-06-27 | 绍兴文理学院 | Intelligent PID controlled waste heat recovery device of oil stain-resistant setting machine and method for controlling internal temperature of right chamber of the intelligent PID controlled waste heat recovery device |
| CN104966536A (en) * | 2015-07-14 | 2015-10-07 | 西安交通大学 | High-temperature working medium heat exchange test system using heat conducting oil as hot fluid and test method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102436185A (en) * | 2011-11-08 | 2012-05-02 | 浙江理工大学 | Modeling method for heat exchanger of heat-setting machine |
| CN102517834A (en) * | 2011-12-06 | 2012-06-27 | 绍兴文理学院 | Intelligent PID controlled waste heat recovery device of oil stain-resistant setting machine and method for controlling internal temperature of right chamber of the intelligent PID controlled waste heat recovery device |
| CN104966536A (en) * | 2015-07-14 | 2015-10-07 | 西安交通大学 | High-temperature working medium heat exchange test system using heat conducting oil as hot fluid and test method |
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| A Kind of Energy Consumption Modeling Method for Heat-Setting Machines;Zhang Yibo et al.;《2010 International Conference on Optoelectronics and Image Processing》;20101231;第24-27页 * |
| 一类热定型机换热器的动态建模方法;张益波 等;《化工学报》;20110831;第62卷(第8期);第2360-2366页 * |
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