CN107179788A - A kind of control method of the classification series connection cooling system of low temperature hot fluid - Google Patents
A kind of control method of the classification series connection cooling system of low temperature hot fluid Download PDFInfo
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- CN107179788A CN107179788A CN201710382073.5A CN201710382073A CN107179788A CN 107179788 A CN107179788 A CN 107179788A CN 201710382073 A CN201710382073 A CN 201710382073A CN 107179788 A CN107179788 A CN 107179788A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
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Abstract
The invention discloses a kind of control method of the classification series connection cooling system of low temperature hot fluid, system includes the two-stage cooling unit and control unit of arranged in series, wherein first order cooling unit is generating cooling unit, second level cooling unit is conventional chilling unit, and control unit is used to control the amount of cooling water that each cooling unit is undertaken；The medium temperature optimal setting value T of two-stage cooling unit is determined according to the running optimizatin target of classification series connection cooling system firstopt, then by monitoring the fluid temperature values T that first order generating cooling unit is exportedm, and with setting value ToptCompare, calculate Δ T=Tm‑ToptValue.The amount of cooling water that the present invention undertakes respectively with the corresponding regulation two-stage cooling unit of the change of process conditions and outdoor weather condition, to realize the running optimizatin target of classification series connection cooling system, optimization aim includes energy conservation priority, the preferential, the lowest coursing cost of water saving etc..
Description
Technical field
The present invention relates to low temperature hot fluid cooling technology field, the classification series connection cooling of more particularly to a kind of low temperature hot fluid
The control method of system.
Background technology
In industries such as coal chemical industry, petrochemical industry, there are many production processes to be required for low for 60~300 DEG C to temperature range
Warm technique hot fluid carries out cooling treatment, is cooled to the target temperature of technological requirement.
The conventional technical grade Large Copacity type of cooling has the composite cold of air cooling, water cooling, vaporation-type cooling and these modes
But, such type of cooling belongs to the conventional chilling mode of energy-dissipating type.
The initial outlay of water-cooling system is smaller, but needs to consume substantial amounts of electric energy and water resource, energy consumption and environment during operation
Pressure is huge；Air cooling system is widely used in water shortage area, and initial cost is high compared with water-cooling system, although do not consume water resource, but
Power consumption is run bigger compared with water-cooling system, while minimum chilling temperature is limited by environment temperature, it may not be possible to meet relatively low
Cool down the requirement of target temperature.Vaporation-type is cooled down and Complex-cooling mode, and power consumption, water consumption are between air cooling and water cooling.
The high energy consumption of conventional chilling mode and the environmental pollution caused, make the cost consumption of its life cycle huge.
Low-temperature cogeneration is that the heat of a part of cryogen is converted to electric energy by a kind of utilization heat to power output principle
Technology, while generating is obtained, realizes the cooling down of technique hot fluid, it is believed that be a kind of the new cold of production capacity type
But mode, referred to as generate electricity the type of cooling.
The generating type of cooling, reduces the thermal pollution to environment, with good effects of energy conservation and environmental protection.But, to generating electricity
The key index that the Technical Economy of the type of cooling plays a decisive role ----net generating efficiency, but with the drop of cooling target temperature
It is low and reduce rapidly.Such as 80 DEG C of hot water, when being cooled to 60 DEG C, net generating efficiency is about 6%, net when being cooled to 40 DEG C
Generating efficiency is about 2%, and unit equipment can be even less than from consuming electric power by being generated electricity when being cooled to 30 DEG C.To technical cooling target
The sensitiveness of temperature, limits the application of this production capacity type type of cooling of the generating type of cooling.
The content of the invention
The purpose of the present invention is to propose to a kind of low temperature hot fluid classification series connection cooling system progress control method, with
The amount of cooling water that the corresponding regulation two-stage cooling unit of change of process conditions and outdoor weather condition undertakes respectively, to realize classification string
Join the running optimizatin control of cooling system, optimal control target includes energy conservation priority, the preferential, the lowest coursing cost of water saving etc..
The purpose of the present invention is achieved through the following technical solutions：A kind of classification series connection cooling system of low temperature hot fluid
The control method of system, system includes the two-stage cooling unit and control unit of arranged in series, and wherein first order cooling unit is hair
Electric cooling unit, second level cooling unit be conventional chilling unit, control unit respectively with generating cooling unit and conventional chilling
Unit is connected, and control unit is used to control the amount of cooling water that each cooling unit is undertaken；
Method comprises the following steps：Determine that two-stage cooling is single according to the optimal control target of classification series connection cooling system first
The medium temperature optimal setting value T of memberopt, then by monitoring the fluid temperature values T that first order generating cooling unit is exportedm, and with
Setting value ToptCompare, calculate Δ T=Tm-ToptValue.If Δ T>Te1, then the amount of cooling water of first order generating cooling unit is increased；
If Δ T<Te2, then the amount of cooling water of generating cooling unit 1 is turned down；If Te2<ΔT<Te1, then do not adjust；Wherein, Te1And Te2It is common to determine
Control accuracy is determined.
It is preferred that, setting value ToptCalculated by corresponding optimized algorithm, Te1、Te2By the control accuracy used
Calculate and provide with control model.
It is preferred that, described control model includes feedback control and PREDICTIVE CONTROL.
It is preferred that, Te1>=0, Te2<0。
It is preferred that, optimal control target includes energy conservation priority, preferential, the minimum operating cost of water saving etc..
It is preferred that, the factor of influence optimization aim includes the inlet temperature T of cooling fluidin, outlet temperature Tout、
The wet and dry bulb temperature T of environmentdryAnd Twet, local electricity price and water price.
It is preferred that, inlet temperature is TinHot fluid initially enter generating cooling unit and be tentatively cooled to centre
Temperature is TmHot fluid, enter back into conventional chilling unit and be finally cooled to target outlet temperature for ToutHot fluid.
It is preferred that, described generating cooling unit includes direct expansion TRT or organic Rankine bottoming cycle generates electricity
Device or direct expansion, organic Rankine bottoming cycle power generation cascade device.
It is preferred that, the electric energy that generating cooling unit is produced can provide electric energy for conventional chilling unit, can also
It is delivered to power network.
It is preferred that, described conventional chilling unit includes power set and conventional chilling device；Described routine
Cooling device includes air cooling equipment, water cooling plant, evaporation device for cooling, and the Compound cooling of at least two above-mentioned types of cooling is filled
Put.
The beneficial effects of the invention are as follows：The present invention accordingly adjusts two-stage with the change of process conditions and outdoor weather condition
The amount of cooling water that cooling unit undertakes respectively, is controlled, optimal control target with the running optimizatin for realizing classification series connection cooling system
Including energy conservation priority, the preferential, the lowest coursing cost of water saving etc.；Moreover, present invention incorporates the generating type of cooling and conventional chilling
The advantage of mode：(1) compared with the generating type of cooling：The hot fluid outlet temperature of generating cooling unit is improved, by it from mesh
Mark temperature toutImprove to medium temperature tm, this will improve the net generating efficiency of generating cooling unit, and reduce generating cooling unit
Initial cost, effectively increase generate electricity cooling Technical Economy, expanded significantly generate electricity cooling application；(2) and often
The rule type of cooling is compared：The net electric generation of the classification series connection cooling system generating cooling unit is typically larger than conventional chilling unit
Power consumption, therefore do not consume electric energy in the cooling procedure to hot fluid, gene-ration revenue produced on the contrary, with good energy-conservation
Environment protecting.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the classification series connection cooling system of low temperature hot fluid of the invention；
Fig. 2 is Partial controll flow chart of the invention；
In figure, 1, generating cooling unit, 2, conventional chilling unit, 3, inlet temperature be TinHot fluid, 4, medium temperature
For TmHot fluid, 5, target outlet temperature be ToutHot fluid, 6, TRT, 7, power set (pump, blower fan etc.), 8,
Cooling medium (water, air etc.), 9, power network, 10, control unit, 11, hot fluid inlet temperature signal Tin, 12, hot fluid target
Outlet temperature signal Tout, 13, meteorologic parameter signal Tenv, 14, hot fluid medium temperature optimal setting value signal Topt, 15, conventional
Cooling device.
Embodiment
Technical scheme is described in further detail below in conjunction with the accompanying drawings, but protection scope of the present invention is not limited to
It is as described below.
As shown in Figure 1 and Figure 2, the control method of the classification series connection cooling system of a kind of low temperature hot fluid, it is characterised in that：
System includes the two-stage cooling unit and control unit 10 of arranged in series, and wherein first order cooling unit is generating cooling unit 1,
Second level cooling unit be conventional chilling unit 2, control unit 10 respectively with generating cooling unit 1 and the phase of conventional chilling unit 2
Even, control unit 10 is used to control the amount of cooling water that each cooling unit is undertaken；
Method comprises the following steps：Determine that two-stage cooling is single according to the running optimizatin target of classification series connection cooling system first
The medium temperature optimal setting value T of memberopt, then by monitoring the fluid temperature values T that first order generating cooling unit 1 is exportedm, and
With setting value ToptCompare, calculate Δ T=Tm-ToptValue.If Δ T>Te1, then the cooling of first order generating cooling unit 1 is increased
Amount；If Δ T<Te2, then the amount of cooling water of generating cooling unit 1 is turned down；If Te2<ΔT<Te1, then do not adjust；Wherein, Te1And Te2Altogether
It is same to determine control accuracy.Medium temperature TmAccording to optimal control target, combined process condition and local meteorological condition, by controlling
Unit 10 carries out reasonable set and in real time adjustment using optimized algorithm, realizes the dynamic for the amount of cooling water that two-stage cooling system is undertaken
Distribution, makes classification connect cooling system on the whole in real time in optimized operation state.
Preferably, control unit 10 gathers hot fluid inlet temperature T in real timeinSignal, hot fluid target outlet temperature ToutLetter
Number and meteorologic parameter TenvSignal, after optimization is calculated, hot fluid medium temperature optimal setting is exported to generating cooling unit 1
Value ToptSignal, and generating cooling unit 1 is adjusted in real time.
Preferably, setting value ToptCalculated by corresponding optimized algorithm, Te1、Te2By the control accuracy used and control
Mode computation is provided.
Preferably, described control model includes feedback control and PREDICTIVE CONTROL.
Preferably, Te1>=0, Te2<0。
Preferably, optimal control target includes energy conservation priority, preferential, the minimum operating cost of water saving etc..
Preferably, the factor of influence optimization aim includes the inlet temperature T of cooling fluidin, outlet temperature Tout, environment
Wet and dry bulb temperature TdryAnd Twet, local electricity price and water price.
Preferably, inlet temperature is TinHot fluid 3 initially enter generating cooling unit 1 and be tentatively cooled to medium temperature
For TmHot fluid 4, enter back into conventional chilling unit 2 and be finally cooled to target outlet temperature for ToutHot fluid 5.Control
Unit 10 gathers heat transferring medium inlet temperature T in real timeinSignal, heat transferring medium outlet temperature ToutSignal and meteorologic parameter TenvLetter
Number, after optimization is calculated, hot fluid medium temperature optimal setting value signal T is exported to generating cooling unit 1opt14, and to hair
Electric cooling unit 1 is adjusted in real time.
Preferably, described generating cooling unit 1 includes direct expansion TRT or organic Rankine bottoming cycle TRT
Or direct expansion, organic Rankine bottoming cycle power generation cascade device.
Preferably, the electric energy that generating cooling unit 1 is produced can provide electric energy for conventional chilling unit 2, can also convey
To power network 9.The electric energy feeding power network 9 that TRT 6 in generating cooling unit 1 is produced, power network 9 is that power set 7 provide electricity
Can, the driving cooling medium 8 of power set 7 is exchanged heat with hot fluid.
Preferably, described conventional chilling unit 2 includes power set 7 and conventional chilling device 15；Described routine is cold
But device 15 includes air cooling equipment, water cooling plant, evaporation device for cooling, and the Compound cooling of at least two above-mentioned types of cooling is filled
Put.
Preferably, the control flow of the classification series connection cooling system control unit 10 is：Step (1)：Control unit 10
Monitor in real time and gather hot fluid inlet temperature Tin(i.e. hot fluid inlet temperature signal Tin11), outlet temperature Tout(i.e. hot-fluid
Body target outlet temperature signal Tout12), meteorologic parameter Tenv(i.e. meteorologic parameter signal Tenv13) signal parameter such as；Step (2)：
The embedded program of control unit 10 is according to optimal control target (energy conservation priority, preferential, the minimum operating cost of water saving etc.) and inputs
Monitoring signals calculate the optimal setting value T of medium temperature in real timeopt；Step (3)：Control unit 10 sets medium temperature optimization
Definite value ToptIt is output to generating cooling unit 1；Step (4)：The amount of cooling water that the regulation generating of control unit 10 cooling unit 1 is undertaken,
By the outlet temperature T of generating cooling unit 1mControl is in the reasonable scope.
Preferably, present invention additionally comprises intermediate heat transfer link, the heat exchange of the link is mainly realized by Intermediate Heat Exchanger, middle
Heat exchanger is located at the two-stage cooling unit upstream of arranged in series, and technique hot fluid exchanges heat with heat transferring medium in Intermediate Heat Exchanger,
Realize the indirect cooling of technique hot fluid.
Preferably, it is necessary to which the technique hot fluid of cooling not directly enters the two-stage cooling unit of arranged in series, but with changing
Thermal medium is exchanged heat in Intermediate Heat Exchanger and is cooled to target temperature, and the heat transferring medium after heat absorption enters arranged in series
Two-stage cooling unit is cooled down, and the heat transferring medium after cooling enters back into Intermediate Heat Exchanger, so circulation.
In certain water-deficient area, there is 100t/h 80 DEG C of hot water, it is necessary to be cooled to 40 DEG C.Local electricity price is 0.5 yuan/kWh,
Water price is 15 yuan/t.Using classification series connection cooling system, first order generating cooling unit 1 uses organic Rankine bottoming cycle TRT
6, its condenser uses composite cooler；Second level conventional chilling unit 2 uses composite cooler.Composite cooler have air cooling and
Cold two kinds of mode of operations are evaporated, the contrast of both of which is as shown in table 1：
The contrast of the two kinds of mode of operations of composite cooler of table 1
The running optimizatin target of the classification series connection cooling system of low temperature hot fluid is the lowest coursing cost, as can be seen from Table 1,
If local water price per ton be every degree 12 times of electricity price and more than, on the premise of cooling target is met, to realize cooling system
Running optimizatin target, should preferentially use air cooling pattern；Only when outdoor temperature is higher, air cooling pattern can not meet cooling effect
When realizing target chilling temperature, just using evaporation refrigerating mode, this is described further below by specifically calculating.
Assuming that being inscribed when a certain, outdoor dry-bulb temperature is 10 DEG C, and wet-bulb temperature is 5 DEG C.
It is assumed that composite cooler uses air cooling pattern, when the outlet temperature of first order generating cooling unit 1 is ToptWhen, hair
The net generating efficiency of electric cooling unit 1 (not deducting cooler power consumption) is η1, then the operating cost of classification series connection cooling system can
Represented by formula (1)：
Due to η1It is on Tin、Topt, dry-bulb temperature TdryFunction, and work as Tin、TdryAll to timing, with ToptReduction and
Reduction；So, for above expression formula, certainly exist an optimal ToptValue, makes F reach minimum.Work as T by calculatingopt's
Be worth for 45 DEG C when, F is minimum, and now F is -9.80 yuan/h.That is the generated energy of classification series connection cooling system is more than power consumption, cooling system
System produces gene-ration revenue.
It is assumed that composite cooler using evaporation chill formula when, generating cooling unit 1 (not deducting cooler power consumption) it is net
Generating efficiency is η2, then being classified the operating cost of series connection cooling system can be represented by formula (2)：
Due to η2It is on Tin、Topt, wet-bulb temperature TwetFunction, and work as Tin、TwetAll to timing, with ToptReduction and
Reduction；So, for above expression formula, also certainly exist an optimal ToptValue, makes F reach minimum.Work as T by calculatingopt
Value when being 42 DEG C, F is minimum, and now F is 6.68 yuan/h.
Contrast (1), formula (2) result of calculation, in order that the lowest coursing cost of classification series connection cooling system, in above-mentioned vacation
If the outdoor weather condition moment, the composite cooler in classification series connection cooling system two-stage cooling unit all should use air cooling pattern
Operation, and medium temperature optimal setting value ToptIt should be 45 DEG C.
Middle medium temperature optimal setting value T is determinedoptAfterwards, generating cooling unit 1 is obtained by temperature sensor to export
Fluid medium temperature TmValue, and and ToptValue compare.Calculate Δ T=Tm-ToptValue.If Δ T>Te1, then first is increased
The amount of cooling water of level generating cooling unit 1；If Δ T<Te2, then the amount of cooling water of generating cooling unit 1 is turned down；If Te2<ΔT<Te1, then
Do not adjust.
Te1、Te2Calculated by the control model used, it is assumed that Te1=1, Te2=-1.When detecting Tm=50 DEG C, now
Δ T=5>1, the amount of cooling water of generating cooling unit 1 is increased, makes TmValue gradually reduce；When detecting Tm=45 DEG C, now -1<Δ
T=0<1, then maintain present running status；When detecting Tm=40 DEG C, now Δ T=-5<- 1, turn generating cooling unit 1 down
Amount of cooling water, make TmValue gradually rise.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, it is noted that all
Any modifications, equivalent substitutions and improvements made within the spirit and principles in the present invention etc., should be included in the guarantor of the present invention
Within the scope of shield.
Claims (10)
1. a kind of control method of the classification series connection cooling system of low temperature hot fluid, it is characterised in that：Classification series connection cooling system
Two-stage cooling unit and control unit including arranged in series, wherein first order cooling unit are generating cooling unit, the second level
Cooling unit is conventional chilling unit, and control unit is connected with generating cooling unit and conventional chilling unit respectively, control unit
For the amount of cooling water for controlling each cooling unit to be undertaken；
Control method is as follows：The centre of two-stage cooling unit is determined according to the optimal control target of classification series connection cooling system first
Temperature optimization setting value Topt, then by monitoring the fluid temperature values T that first order generating cooling unit is exportedm, and and setting value
ToptCompare, calculate Δ T=Tm-ToptValue.If Δ T>Te1, then the amount of cooling water of first order generating cooling unit is increased；If Δ T<
Te2, then the amount of cooling water of generating cooling unit is turned down；If Te2<ΔT<Te1, then do not adjust；Wherein, Te1And Te2Control is together decided on
Precision processed.
2. a kind of control method of the classification series connection cooling system of low temperature hot fluid according to claim 1, its feature exists
In：Setting value ToptCalculated by corresponding optimized algorithm, Te1、Te2By the control accuracy and control model that use calculate to
Go out.
3. a kind of control method of the classification series connection cooling system of low temperature hot fluid according to claim 2, its feature exists
In：Described control model includes feedback control and PREDICTIVE CONTROL.
4. a kind of control method of the classification series connection cooling system of low temperature hot fluid according to claim 1 or 2 or 3, its
It is characterised by：Te1>=0, Te2<0。
5. a kind of control method of the classification series connection cooling system of low temperature hot fluid according to claim 1 or 2 or 3, its
It is characterised by：Optimization aim includes energy conservation priority, preferential, minimum operating cost of economizing on water.
6. a kind of control method of the classification series connection cooling system of low temperature hot fluid according to claim 1 or 2 or 3, its
It is characterised by：The factor of influence optimization aim includes the inlet temperature T of cooling fluidin, outlet temperature Tout, environment wet and dry bulb
Temperature TdryAnd Twet, local electricity price and water price.
7. a kind of control method of the classification series connection cooling system of low temperature hot fluid according to claim 1, its feature exists
In：Inlet temperature is TinHot fluid initially enter generating cooling unit and be tentatively cooled to medium temperature for TmHot fluid,
Enter back into conventional chilling unit and be finally cooled to target outlet temperature for ToutHot fluid.
8. a kind of control method of the classification series connection cooling system of low temperature hot fluid according to claim 1 or 7, its feature
It is：Described generating cooling unit include direct expansion TRT or organic Rankine bottoming cycle TRT or direct expansion,
Organic Rankine bottoming cycle power generation cascade device.
9. a kind of control method of the classification series connection cooling system of low temperature hot fluid according to claim 1, its feature exists
In：The electric energy that generating cooling unit is produced can provide electric energy for conventional chilling unit, can also be delivered to power network.
10. a kind of control method of the classification series connection cooling system of low temperature hot fluid according to claim 1 or 9, it is special
Levy and be：Described conventional chilling unit includes power set and conventional chilling device；Described conventional chilling device includes wind
Device for cooling, water cooling plant, evaporation device for cooling, and at least two above-mentioned types of cooling composite cooling apparatus.
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| CN104712403A (en) * | 2015-03-16 | 2015-06-17 | 吉林大学 | Supercritical heat accumulating type organic Rankine cycle exhaust afterheat comprehensive utilization device |
| CN105698432A (en) * | 2016-01-21 | 2016-06-22 | 天津大学 | Multi-functional-mode CO2 refrigeration and power generation combined circulating system and mode switching control method |
| CN106687667A (en) * | 2014-08-29 | 2017-05-17 | 阿特拉斯·科普柯空气动力股份有限公司 | Method for cooling of the compressed gas of a compressor installation and compressor installation in which this method is applied |
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2017
- 2017-05-26 CN CN201710382073.5A patent/CN107179788B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1974041A (en) * | 2006-12-22 | 2007-06-06 | 江苏沙钢集团有限公司 | Strip steel reeling temperature controlling method and device |
| US20140075939A1 (en) * | 2011-05-20 | 2014-03-20 | Alstom Technology Ltd | Solar thermal power plant |
| CN106687667A (en) * | 2014-08-29 | 2017-05-17 | 阿特拉斯·科普柯空气动力股份有限公司 | Method for cooling of the compressed gas of a compressor installation and compressor installation in which this method is applied |
| CN104712403A (en) * | 2015-03-16 | 2015-06-17 | 吉林大学 | Supercritical heat accumulating type organic Rankine cycle exhaust afterheat comprehensive utilization device |
| CN105698432A (en) * | 2016-01-21 | 2016-06-22 | 天津大学 | Multi-functional-mode CO2 refrigeration and power generation combined circulating system and mode switching control method |
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