CN104062899B - Heat-exchange network energy saving performance evaluation methodology based on pinch technology - Google Patents
Heat-exchange network energy saving performance evaluation methodology based on pinch technology Download PDFInfo
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Abstract
A kind of heat-exchange network energy saving performance evaluation methodology based on pinch technology is: obtain maximum hot and cold public work consumption in heat-exchange network based on pinch technology；Minimum hot and cold public work consumption is obtained based on pinch technology；Obtain actual hot and cold public work consumption by reality test, or obtain actual hot and cold public work consumption by the difference of maximum hot and cold public work consumption Yu heat exchanger heat exchange load；Introduce heat recovery efficiency evaluating and be defined as the difference of maximum hot and cold public work consumption and the consumption of minimum cold and hot public work and the ratio of the difference of the cold and hot public work consumption of maximum hot and cold public work consumption and reality.What the heat recovery efficiency evaluating that present invention introduces and method met that evaluation methodology proposes by different user should have comparability, can trace to the source, can contrastive feature requirement.
Description
Technical field
The present invention relates to the evaluation methodology of a kind of heat-exchange network energy saving performance determining heat exchanger or multiple stage heat exchanger composition.
Background technology
The devices such as oil refining, chemical industry, power are formed heat-exchange network by some heat exchangers, is used for realizing the exchange of hot and cold medium heat, improves low temperature logistics temperature, reduce in device for heating the hot public work such as furnace fuel consumption that low temperature logistics consumes；Reduce high temperature stream temperature, reduce cold public work such as air cooler, water cooler water, electric consumption.So, although separate unit heat exchanger or heat-exchange network belong to energy delivery devices, but it reclaims how much heat energy has influence on device energy resource consumption size.In commercial plant, hot and cold logistics is more, and it is huge that heat-exchange network reclaims thermic load, and its energy recovery level is to the how rare material impact of device energy resource consumption.
How to evaluate, compare various heat exchange network heat energy recovery levels for commercial plant heat exchange unit energy efficiency supervision, operation maintenance and optimize design all have important value.The thermal property Study on Evaluation report related to currently, with respect to heat-exchange network or heat exchanger can be summarized as two classes, and one is based on the first law of thermodynamics, and the evaluating of use includes, wherein,Represent heat exchanger overall heat-transfer coefficient, overall presure drop, number of transfer units, thermic load respectively, be mainly used in evaluating heat transfer and flow resistance performance.Two are based on the evaluating that the second law of thermodynamics is set up, including entropy production unit number, (fire is used) efficiency etc..
A kind of Modular heat exchanger thermal performance online rating system is disclosed, including heat exchanger module, operation module and control module at the patent of invention CN201310276989.4 announced.This patented method is mainly used in surveying online the thermal parameters such as heat exchanger inlet and outlet temperature, pressure.
CN200610103760.0 discloses the evaluation methodology of a kind of letter wall type heat exchanger effectiveness, it is judged that can heat transfer process meet manufacturing technique requirent and satisfaction degree, and evaluating is original design pressure difference and benchmark heat-transfer intensity.This patent is based on the first law of thermodynamics, it is mainly used in evaluating whether to meet technique heat transfer requirements, parameter required for implementing this patented technology is the convection heat transfer' heat-transfer by convection film coefficient describing heat transfer property, overall heat-transfer coefficient, Nu Saier Correlation equations, and the Euler criteria correlation of description flow resistance performance, coefficient of friction etc..
The national standard review held by energy basis, the whole nation and management standardization technical committee power-saving technology and information point technical committee discloses " cooling air conditioner heat-exchangers of the plate type exergy efficiencyX evaluation methodology ", air cooling heat exchanger exergy efficiencyX evaluation methodology ".Such method evaluation object set is evaluated separate unit heat exchanger and reclaims quality and the quantity of heat energy.
At present, in engineering reality, for heat-exchange network energy saving performance evaluation mainly with cryogenic media through heat-exchange network heat exchange heat up after temperature and heat exchange final temperature for evaluating.If namely heat exchange final temperature height thinks that heat-exchange network energy saving performance is high, if heat exchange final temperature is low, think that heat-exchange network energy saving performance is low.This Appreciation gist can only provide qualitative conclusions, it is impossible to quantitative assessment heat-exchange network energy saving performance.Be additionally, since in different commercial plant hot and cold stream sizes, payload different, heat-exchange network reclaims heat energy Potentiality and also differs.The heat exchange final temperature height comparing heat-exchange network or heat exchanger simply does not have comparability, can only compare the change of heat-exchange network operation level, not be suitable for the energy saving performance comparing various heat exchange network.
Pinch technology is a kind of heat-exchange network energy recovery Optimization Design proposing the seventies in last century and being used widely.This know-why is with cold logistics load enthalpy for abscissa, and temperature is that vertical coordinate sets up Sweet service, by uniform temperature is interval, cold for multiply logistics is merged into temperature enthalpy composite curve, and heat temperature enthalpy composite curve similar approach obtains.Article two, curve projects lap on the horizontal scale and is the heat exchange amount of hot and cold logistics, and lap is not hot and cold shared engineering consumption.When hot and cold composite curve moves horizontally close, heat exchange amount increases, and hot and cold utility consumption reduces.The degree of closeness that allows curve depends on heat exchanger heat exchange area size and the impact of equipment heat exchange property in heat-exchange network.When hot and cold composite curve reaches maximum allowable degree of closeness, hot and cold logistics heat exchange amount is maximum, and the corresponding hot and cold logistics temperature difference is narrow point.
Summary of the invention
For heat-exchange network energy recovery level in rational evaluation commercial plant, the present invention provides a kind of heat-exchange network energy saving performance evaluation methodology based on pinch technology.
For realizing above-mentioned target, the technical scheme that the present invention takes is:
A kind of heat-exchange network energy saving performance evaluation methodology based on pinch technology is: obtain maximum hot and cold public work consumption in heat-exchange network based on pinch technology；Minimum hot and cold public work consumption is obtained based on pinch technology；Obtain actual hot and cold public work consumption by reality test, or obtain actual hot and cold public work consumption by the difference of maximum hot and cold public work consumption Yu heat exchanger heat exchange load；Introduce heat recovery efficiency evaluating and be defined as the difference of maximum hot and cold public work consumption and the consumption of reality hot and cold public work and the ratio of maximum hot and cold public work consumption and the difference of minimum hot and cold public work consumption.
This evaluation methodology concretely comprises the following steps: complete following steps based on heat-exchange network pinch technology:
(1) all of cold flow stock, hot-fluid stock in heat-exchange network are listed；Cold flow stock index needs the logistics of heat temperature raising, and hot-fluid stock then refers to the logistics needing to cool.
(2) all hot and cold stream plume amounts, initial temperature, target temperature, specific heat capacity parameter are determined；
Or if the temperature of hot and cold stream stock, hot and cold stream stock enthalpy after heating, cooling can be directly obtained, then do not need flow, specific heat capacity parameter.
(3) calculate all cold flow stock-traders' know-how over-heat-exchangers and heat energy that hot public work absorbs or enthalpy, calculate all hot-fluid stock-traders' know-how over-heat-exchangers and heat energy that cold public work is released or enthalpy；Namely all cold flow stocks heat absorption load, hot-fluid stock heat release load are calculated respectively；The heat release load sum of cold flow stock heat absorption load and hot-fluid stock is device public work consumption peak, usesRepresenting, this value is uniquely determined by process conditions；
If the temperature of hot and cold stream stock can be directly obtained, hot and cold stream stock enthalpy after heating, cooling, the enthalpy of the hot and cold stream stock directly obtained can be added and determine。
(4) between cold logistics minimum temperature and maximum temperature, some temperature ranges are divided, the cold logistics enthalpy superposition of identical temperature range will be in, setting up the temperature in this temperature range-enthalpy line segment, the temperature of each temperature range of link division-enthalpy line segment forms cold logistics composite curve.
(5) between hot logistics minimum temperature and maximum temperature, some temperature ranges are divided, the hot logistics enthalpy superposition of identical temperature range will be in, setting up the temperature in this temperature range-enthalpy line segment, the temperature of each temperature range of link division-enthalpy line segment forms hot logistics composite curve.
(6) evaluating is introduced。Represent that in heat-exchange network, equipment heat exchange area is infinitely great, during recuperation of heat amount theoretical maximum, the hot and cold public work amount summation minima that device consumes in theory.Represent the hot and cold utility consumption summation of device actual consumption.Owing in heat-exchange network, equipment heat exchange area can not be infinitely great, when recovery heat energy can not reach maximum theoretical, the hot and cold public work amount summation actual value that the heat absorption of hot and cold stream stock, heat release consume.Meet。
Obtain as follows: cold logistics temperature-enthalpy curve chart and hot logistics temperature enthalpy curve chart are incorporated on same warm enthalpy curve chart.Fixing hot composite curve, moving horizontally cold composite curve thermotropism composite curve near making pinch point temperature is zero.Corresponding hot and cold public work amount sum is。
For hot and cold public work actual consumption amount sum, obtain by testing hot and cold public work such as fuel flow rate, discharge, electric quantity consumption in device.Owing to relating to the equipment such as furnace fuel consumption of hot and cold public work consumption in commercial plant, the water of air cooler, electric consumption all can be made directly metering.Also can be byObtain with the difference of heat exchanger heat exchange load.Public work actual consumption amountIt is greater than theoretical consumption minimumNamely。
In the present invention,Reflection ther mal network maximum heat yield in theory,Reflection heat-exchange network actual recovered heat energy value.WithWithRatioAs evaluating, depict the gap of heat-exchange network actual energy recovery amount and maximum heat energy yield, reflected heat-exchange network energy recovery level.Due toIt is the unique value of concrete heat-exchange network.Thus it is guaranteed that evaluation result have can quantify, objective uniqueness, can reproduce, comparability.
In addition, the hot and cold utility consumption size of general metering in commercial plant, such as air cooler power consumption, the recirculated water consumption of water cooler, furnace fuel consumption and technology key thermal parameter, but the process parameters such as the temperature of all heat exchangers, flow, specific heat will not be measured.The present invention is calculated by design load and process conditions and determines, withThe reflection actual recuperation of heat amount of device indirectly, it is ensured that the method can be traced to the source and operability.
Described in comprehensive, what the heat recovery efficiency evaluating that present invention introduces and method met that evaluation methodology proposes by different user should have comparability, can trace to the source, can contrastive feature requirement.
Accompanying drawing illustrates:
Fig. 1 is the embodiment of the present invention 1 technological process；
Fig. 2 is method embodiment 1 maximum cold public work schematic diagram of the present invention；
Fig. 3 is the embodiment of the present invention 1 utility target schematic diagram；
Fig. 4 is the actual public work schematic diagram of the embodiment of the present invention 1.
Detailed description of the invention
The present invention is further illustrated below in conjunction with drawings and the specific embodiments.
Embodiment 1:
Certain heat-exchange network is by a heat exchanger E-101, a heating furnace, an air cooler composition.100 DEG C of low temperature process medium, inflow heat exchanger absorbs 70 unit heats, temperature enters heating furnace after becoming 170 DEG C, it is heated to 300 DEG C after absorbing 130 hot public works of unit, chemical heat release is occurred to flow into E-101 and cryogenic media heat exchange cooling after cooling to 280 DEG C after flowing out from heating furnace in inflow reactor, releasing 70 unit heat energy, outlet temperature flows into air cooler again and is cooled to 40 DEG C after being reduced to 140 DEG C, consumes 50 cold public works of unit.
The present invention sequentially includes the following steps: based on the heat-exchange network heat recovery efficiency evaluation methodology embodiment 1 of pinch technology
The first step: cold flow stock minimum temperature 100 DEG C, maximum temperature 300 DEG C, 200 unit heat energy enthalpies of Absorption of Medium.With temperature for vertical coordinate, enthalpy is that abscissa sets up cold logistics temperature enthalpy curve chart.
Second step: hot-fluid stock maximum temperature 280 DEG C, minimum temperature 40 DEG C, medium releases 120 unit heat energy enthalpies.With temperature for vertical coordinate, enthalpy is that abscissa sets up hot logistics temperature enthalpy curve chart.Individual unit enthalpy.
3rd step: calculate.Fixing hot logistics temperature enthalpy curve, moves horizontally cold logistics temperature enthalpy curve, makes cold logistics temperature enthalpy curve and hot logistics temperature enthalpy curve intersection.Now the pinch point temperature of hot and cold logistics temperature enthalpy curve is zero, and the heat energy of recovery is maximum, 90 unit enthalpies of hot and cold media for heat exchange.Absorb heat under 200 unit enthalpy permanence conditions of load at cold medium, only need 110 unit heat energy enthalpies of hectic fever public work can meet technological requirement.Under 120 unit enthalpy permanence conditions of cold medium heat release load, only need 30 unit heat energy enthalpies of hectic fever public work can meet technological requirement.Therefore, utility target consumption isIndividual unit enthalpy.
4th step: in actual process process, because there is heat exchanger, 70 unit of hot and cold media for heat exchange, then absorb heat under 200 unit enthalpy permanence conditions of load in cold logistics, then actual have only to consume 130 hot public works of unit again and can meet technological temperature requirement.Under 120 unit enthalpy permanence conditions of hot logistics heat release load, then actual have only to consume 50 cold public works of unit again and can meet technological temperature requirement.The hot and cold public work sum of actual consumption isThe heat energy enthalpy of individual unit.
5th step: introduce heat recovery efficiency evaluating。
。
Evaluating heat recovery efficiency scope more than zero less than 1.Heat recovery efficiency value is more big, illustrate in device, the heat energy that the heat-exchange network being made up of some heat exchangers is recycled is more many, decrease on the one hand cold flow stock heat up required consume heating furnace, the cracking hot public work consumption such as furnace oil, combustion gas, decrease on the other hand simultaneously the cooling of hot-fluid stock required consume air cooler, water cooler water, the cold public work consumption such as electricity.The production of units energy resource consumption rate of device is low.Otherwise, as the same.The heat recovery efficiency of the heat-exchange network being determined by different device, can evaluating apparatus energy consumption efficiency and level.
Claims (3)
1. the heat-exchange network energy saving performance evaluation methodology based on pinch technology, it is characterised in that: obtain maximum hot and cold public work consumption in heat-exchange network based on pinch technology；Minimum hot and cold public work consumption is obtained based on pinch technology；Obtain actual hot and cold public work consumption by reality test, or obtain actual hot and cold public work consumption by the difference of maximum hot and cold public work consumption Yu heat exchanger heat exchange load；Introduce heat recovery efficiency evaluating and be defined as the difference of maximum hot and cold public work consumption and the consumption of reality hot and cold public work and the ratio of maximum hot and cold public work consumption and the difference of minimum hot and cold public work consumption.
2. a kind of heat-exchange network energy saving performance evaluation methodology based on pinch technology according to claim 1, it is characterised in that: this evaluation methodology concretely comprises the following steps: complete following steps based on heat-exchange network pinch technology:
(1) all of cold flow stock, hot-fluid stock in heat-exchange network are listed；Cold flow stock index needs the logistics of heat temperature raising, and hot-fluid stock then refers to the logistics needing to cool；
(2) all hot and cold stream plume amounts, initial temperature, target temperature, specific heat capacity parameter are determined；Or if the temperature of hot and cold stream stock, hot and cold stream stock enthalpy after heating, cooling can be directly obtained, then do not need flow, specific heat capacity parameter；
(3) calculate all cold flow stock-traders' know-how over-heat-exchangers and heat energy that hot public work absorbs or enthalpy, calculate all hot-fluid stock-traders' know-how over-heat-exchangers and heat energy that cold public work is released or enthalpy；Namely all cold flow stocks heat absorption load, hot-fluid stock heat release load are calculated respectively；The heat release load sum of cold flow stock heat absorption load and hot-fluid stock is device public work consumption peak, usesRepresenting, this value is uniquely determined by process conditions；
If the temperature of hot and cold stream stock can be directly obtained, hot and cold stream stock enthalpy after heating, cooling, the enthalpy of the hot and cold stream stock directly obtained can be added and determine；
(4) between cold flow stock minimum temperature and maximum temperature, some temperature ranges are divided, the cold flow stock enthalpy superposition of identical temperature range will be in, setting up the temperature in this temperature range-enthalpy line segment, the temperature of each temperature range of link division-enthalpy line segment forms the cold composite curve of cold flow stock；
(5) between hot-fluid stock minimum temperature and maximum temperature, some temperature ranges are divided, the hot-fluid stock enthalpy superposition of identical temperature range will be in, setting up the temperature in this temperature range-enthalpy line segment, the temperature of each temperature range of link division-enthalpy line segment forms the hot composite curve of hot-fluid stock；
(6) evaluating is introduced；
When representing equipment heat exchange area infinity in heat-exchange network, during recuperation of heat amount theoretical maximum, the theoretical minimum value of the hot and cold utility consumption summation that the heat absorption of hot and cold medium, heat release consume；
For hot and cold public work actual consumption amount sum, represent owing in heat-exchange network, equipment heat exchange area can not be infinitely great, when recovery heat energy can not reach maximum theoretical, the actual value of the hot and cold utility consumption summation that the heat absorption of hot and cold medium, heat release consume；Meet。
3. a kind of heat-exchange network energy saving performance evaluation methodology based on pinch technology according to claim 2, it is characterised in that: in described step (six)Obtaining as follows: fixing hot composite curve, moving horizontally cold composite curve thermotropism composite curve near making pinch point temperature is zero, and corresponding hot and cold utility consumption sum is；Obtain by testing hot and cold public work such as fuel flow rate, discharge, electric quantity consumption in device, or, owing to relating to the equipment such as furnace fuel consumption of hot and cold public work consumption in commercial plant, the water of air cooler, electric consumption all can be made directly meteringByObtain with the difference of heat exchanger heat exchange load；Public work actual consumption amountIt is greater than theoretical consumption minimum, namely。
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