CN102073788B - Industrial energy calculation system - Google Patents

Abstract

The invention relates to an industrial energy calculation system. A process data acquisition module stores industrial process data acquired in a production process control system into a data memory; the data memory inputs the industrial process data into a data structural correlation database and a calculation module respectively; the data structural correlation database calculates corresponding intermediate data according to the industrial process data and inputs the intermediate data into the calculation module; the calculation module outputs corresponding enthalpy and entropy according to the intermediate data and industrial process data. The industrial energy calculation system outputs the intermediate calculation results by building the data structural correlation database and calculates in different energy calculation models, greatly simplifies the calculation process of energy data, is widely applicable to various different industrial enterprises, meets all kinds of requirements of enterprise energy management work and provides data basis for developing deep energy use diagnosis and analysis work for enterprises.

Description

A kind of industrial energy calculation system

Technical field

The present invention relates to a kind of energy computing system, be specifically related to a kind of industrial energy calculation system.

Background technology

China is one of maximum in the world energy resource consumption state, and energy cost accounting example in total cost is higher, thereby the energy-saving and cost-reducing key task that has become each manufacturing enterprise of China.Many large and medium-sized industrial enterprise have proposed serial of methods and measure comes the propulsion energy-saving consumption reduction.The enterprise energy management is the basis of energy-saving and cost-reducing work, by the enterprise energy consumption situation is described intuitively, finds the weak link in the energy utilization process, proposes improvement direction and measure.

The enterprise energy management is the systems engineering of a complexity, and its primary work is obtaining of energy datum.At present, industrial enterprises at different levels mainly add up as main take the energy measurement based on process data, only reflect the overall equilbrium of the energy, reflect quantitatively that namely the production of the various products of enterprise consumes formation.Although this statistics can reflect production scale and the energy consumption of enterprise to a certain extent, by process data be difficult to enterprise produce carry out deep with diagnosing and the work such as analysis.Usually, with can diagnose and analyze required enthalpy, entropy,

Loaded down with trivial details etc. data computation process complexity, thus energy datum calculate accurately, fast be enterprise with can diagnose and analytical work in a bottleneck.

Summary of the invention

The present invention is directed to the deficiencies in the prior art, having proposed a kind ofly to set up the industrial energy computation model of different-energy medium by set up being used for the data structure linked database of output results of intermediate calculations, output with can diagnose and analyze required enthalpy, entropy, The industrial energy calculation system of data.

Technical scheme of the present invention is as follows:

A kind of industrial energy calculation system, it is characterized in that: it comprises the data structure linked database, computing module, process data acquisition module and data-carrier store, the industrial process data that the process data acquisition module will gather in industries process control system deposits in the data-carrier store, data-carrier store is inputted described industrial process data respectively in described data structure linked database and the computing module, described data structure linked database calculates corresponding intermediate data according to described industrial process data, and with described intermediate data input computing module, computing module comprises according to the classify corresponding energy computation model of different-energy medium of gained of the characteristics of industrial enterprise's energy medium, calls described intermediate data and industrial process data calculates and output is corresponding enthalpy according to the corresponding energy computation model of different-energy medium, entropy and

Wherein, described industrial process data comprises mass parameter, flow parameter, electrical parameter, mean pressure parameter, medial temperature parameter; Described data structure linked database comprises technological process mixing gas component table, signature coefficient table, saturated vapour thermodynamic data table, superheated vapor thermodynamic data table, mixed gas thermodynamic parameter summary table and the liquid heat power mathematic(al) parameter table of corresponding each energy medium; Comprise fuel energy computation model, steam energy computation model, mixing material energy computation model, mixed gas energy computation model in the computing module.

When described energy medium is fuel, input signature coefficient, flow parameter and mass parameter in the described fuel energy computation model, the output enthalpy and

Described signature coefficient is the corresponding amount of fuel in the signature coefficient table.

When described energy medium is steam, input flow rate parameter, specific enthalpy and specific entropy in the described steam energy computation model, output enthalpy, entropy and Specific enthalpy and specific entropy are medial temperature parameter and the average corresponding amount of pressure parameter in saturated vapour thermodynamic data table or superheated vapor thermodynamic data table.

When described energy medium is mixing material, input flow rate parameter, medial temperature parameter, mean pressure parameter, density, mean specific heat in the described mixing material energy computation model, output enthalpy, entropy and

Density, mean specific heat are the corresponding amount of mixing material in liquid heat power mathematic(al) parameter table.

When the mass rate=volume of described mixing material * density,

$\underset{.}{..}\mathrm{dH}=C_p\mathrm{dT}+[V-T{\left(\frac{\∂V}{\∂T}\right)}_P]\mathrm{dp};\mathrm{dS}=C_p\frac{\mathrm{dT}}{T}-{\left(\frac{\∂V}{\∂T}\right)}_p\mathrm{dp}$

The specific enthalpy h=C of ∴ mixing material _p(T-T ₀)

Enthalpy=the flow of mixing material * specific enthalpy;

The specific entropy of mixing material

Entropy=the flow of mixing material * specific entropy

Mixing material

$\mathrm{Ex}=(H-H_0)-T_0(S-S_0)=C_p(T-T_0)-T_0{C}_p\ln \frac{T}{T_0}$

Wherein, H is liquid enthalpy under the physical condition; S is liquid entropy under the physical condition; H ₀Be benchmark attitude liquid enthalpy; S ₀Be benchmark attitude liquid entropy; V is the liquid volume flow; T is actual temperature; T ₀Be benchmark attitude temperature.

When described energy medium was mixed gas, described mixed gas energy computation model comprised physical change energy computation model and chemical change energy computation model, wherein physical change energy computation model output physics enthalpy change, physics Entropy Changes and physics , chemical change energy computation model is exported chemical enthalpy, Chemistry Entropy and chemistry

The enthalpy of mixed gas=physics enthalpy change+chemical enthalpy, the entropy of mixed gas=physics Entropy Changes+Chemistry Entropy, mixed gas

=physics

+ chemistry

The average specific heat at constant pressure that input flow rate parameter in the described physical change energy computation model, medial temperature parameter, partial component pressure, the average specific heat at constant pressure that is used for calculating enthalpy hold and be used for Calculating Entropy holds output physics enthalpy change, physics Entropy Changes and physics

Partial component pressure is the corresponding amount of mixed gas in technological process mixing gas component table; The ideal gas specific heat capacity coefficient table calculating that the average specific heat at constant pressure that is used for calculating the average specific heat at constant pressure appearance of enthalpy and be used for Calculating Entropy holds by mixed gas thermodynamic parameter summary table obtains

The physics enthalpy change: $\mathrm{\ΔH}=C_{\mathrm{pmh}}^{*}(T-T_0)$

The physics Entropy Changes: $\mathrm{\ΔS}=C_{\mathrm{pms}}^{*}\ln \frac{T}{T_0}-R\ln \frac{p}{p_0}$

Physics

${\mathrm{Ex}}_{\mathrm{ph}}=(H-H_0)-T_0(S-S_0)=C_{\mathrm{pmh}}^{*}(T-T_0)-T_0[C_{\mathrm{pms}}^{*}\ln \frac{T}{T_0}-R\ln \frac{p}{p_0}]$

Wherein,

That mixed gas is used for the specific heat at constant pressure that enthalpy calculates, Be the specific heat at constant pressure that calculates for entropy, T is actual temperature, T ₀Be benchmark attitude temperature, H is the enthalpy of mixed gas under the physical condition; S is the entropy of mixed gas under the physical condition; H ₀Be benchmark attitude enthalpy; S ₀Be benchmark attitude entropy, p is actual pressure; p ₀Be benchmark attitude pressure; Benchmark attitude take the status of criterion as mixed gas.

Computation process in the described ideal gas specific heat capacity coefficient table is:

Mixed gas T ₁～T ₂The average specific heat at constant pressure that being used in the temperature range calculated enthalpy holds:

$\underset{i}{\mathrm{\Σ}}{n}_i\frac{C_{\mathrm{pmh}}^{*}}{R}=\underset{i}{\mathrm{\Σ}}{n}_i{A}_i+\left(\underset{i}{\mathrm{\Σ}}{n}_i{B}_i\right)T_{\mathrm{am}}+\left(\underset{i}{\mathrm{\Σ}}{n}_i{C}_i\right)\left[\frac{1}{3}(4{T_{\mathrm{am}}}^2-T_1{T}_2)\right]+\left(\underset{i}{\mathrm{\Σ}}{n}_i{D}_i\right){T_1}^{-1}{T_2}^{-1},$

T wherein _AmThe arithmetic mean temperature, n _iThe amount of each component of mixed gas,

The average specific heat at constant pressure appearance that mixed gas is used to calculate enthalpy,

Be the thermodynamics medial temperature, R is gas constant; Ideal gas mixture T ₁～T ₂The average specific heat at constant pressure that is used for Calculating Entropy in the temperature range holds:

$\underset{i}{\mathrm{\Σ}}{n}_i\frac{C_{\mathrm{pmh}}^{*}}{R}=\underset{i}{\mathrm{\Σ}}{n}_i{A}_i+\left(\underset{i}{\mathrm{\Σ}}{n}_i{B}_i\right)T_{\mathrm{lm}}+\left(T_{\mathrm{am}}{T}_{\mathrm{lm}}\right)(\underset{i}{\mathrm{\Σ}}n{C}_i+\underset{i}{\mathrm{\Σ}}{n}_i{D}_i{T_1}^{-2}{T_2}^{-2}).$

Input flow rate parameter, medial temperature parameter, mean pressure parameter, average specific heat at constant pressure hold in the described chemical change energy computation model, export chemical enthalpy, Chemistry Entropy and chemistry

It is the corresponding amount of mixed gas in technological process mixing gas component table that average specific heat at constant pressure holds; Chemistry enthalpy, Chemistry Entropy, chemistry

Becoming the Entropy Changes table by the standard enthalpy of formation in the described mixed gas thermodynamic parameter summary table obtains.

Technique effect of the present invention is as follows:

The inventive method is a kind of industrial energy calculation system, based on the first law of thermodynamics and the second law of thermodynamics, comprise the data structure linked database, computing module, process data acquisition module and data-carrier store, the industrial process data that the process data acquisition module will gather in industries process control system deposits in the data-carrier store, data-carrier store is inputted described industrial process data respectively in described data structure linked database and the computing module, described data structure linked database calculates corresponding intermediate data according to described industrial process data, and with described intermediate data input computing module, computing module comprises according to the classify corresponding energy computation model of different-energy medium of gained of the characteristics of industrial enterprise's energy medium, calls described intermediate data and industrial process data calculates and output is corresponding enthalpy according to the corresponding energy computation model of different-energy medium, entropy and

The present invention classifies medium according to the characteristics of industrial enterprise's energy medium, with this basis that is categorized as, sets up the energy computation model of different-energy medium, has greatly simplified the computation process of energy datum.Utilize this model real-time to obtain the required energy datum of enterprise's energy analysis equal energy source management work, for enterprise carries out deep with diagnosing and analytical work provides the data basis.

The present invention, calculates in different energy computation models in the input computing module by setting up data structure linked database output results of intermediate calculations, greatly simplifies the computation process of energy datum.System of the present invention can obtain the required process datas of work such as energy analysis by process data acquisition module real-time, and distinguished with the instrument item, generally be applicable to all kinds of different industrial enterprises, satisfy the various demands of Management Work of Energy Sources in Enterprises, for enterprise carries out deep with diagnosing and analytical work provides the data basis.

Description of drawings

Fig. 1 is the structural representation of industrial energy calculation system of the present invention

Fig. 2 is the structural representation of data structure linked database of the present invention and computing module

Embodiment

The present invention will be described below in conjunction with accompanying drawing.

As shown in Figure 1, industrial energy calculation system of the present invention comprises data structure linked database 1, computing module 2, process data acquisition module 3, data-carrier store 4.

A plurality of associated data tables are set in the data structure linked database 1, be mixed gas, water, mixing material, steam, feed coal, electricity, wet goods according to material characteristic with the enterprise energy medium classification, and with these energy medium definition medium number in table respectively, wherein pure component gas and pure component liquid are included in mixed gas and the mixing material, and computing method are consistent with mixed gas and mixing material.Set the corresponding relation that medium number is intended to determine different-energy medium and its analysis data and computing method, the coding of medium number can number to define in conjunction with national regulation code and enterprise's energy medium, with the assurance uniqueness.Each medium correspondence one cover associated data table is integrated analysis data, thermodynamic parameter in the associated data table, according to results of intermediate calculations, export enthalpy corresponding to each energy medium, entropy,

Data.Wherein data structure linked database 1 comprises technological process mixing gas component table 11, enterprise energy signature coefficient table 12, saturated vapour thermodynamic data table 13, superheated vapor thermodynamic data table 14, mixed gas thermodynamic parameter summary table 15, liquid heat power mathematic(al) parameter table 16 etc.

Each component volume content of comprising of technological process mixing gas component table 11 expression mixed gas wherein comprises the partial component pressure of mixed gas, the average specific heat at constant pressure that is used for calculating enthalpy and holds and be used for the parameters such as the average specific heat at constant pressure appearance of Calculating Entropy, gas density.Enterprise energy signature coefficient table 12 derives from the subordinate list remarks of State Statistics Bureau state system word (2006) No. 185 " energy statistics system of statement " and National Development and Reform Commission's resources conservation and environmental protection department on February 2nd, 2007 " about reporting and submitting the letter of thousand industry energy conservations in 2006 ".Relation between the expression of saturated vapour thermodynamic data table 13 temperature, pressure and liquid enthalpy, vapour enthalpy and the vapour-liquid enthalpy.Superheated vapor thermodynamic data table 14 is contained each other pressure of steam level in the actual production according to production run, again with temperature value inquiry specific enthalpy and specific entropy, adopts the specific enthalpy under linear interpolation method acquisition actual temperature and the pressure and compares entropy.Mixed gas thermodynamic parameter summary table 15 is divided into ideal gas specific heat capacity coefficient table 151 and standard enthalpy of formation becomes Entropy Changes table 152, ideal gas specific heat capacity coefficient table 151 comprises component sequence number, component code name, component title, molecular formula, ideal gas specific heat capacity coefficient, correction factor, and standard enthalpy of formation becomes Entropy Changes table 152 and comprises that gas standard generates enthalpy change, standard generates Free enthalpy change, standard generation Entropy Changes, standard chemical

The thermodynamic parameters such as the density of liquid heat power mathematic(al) parameter table 16 expression mixing material, mean specific heat.

Comprise fuel energy computation model 21, steam energy computation model 22, mixing material energy computation model 23, mixed gas energy computation model 24 in the computing module 2.Wherein fuel energy computation model 21 comprises feed coal energy computation model, oily energy computation model, electric flux computation model; Steam energy computation model 22 comprises saturated vapour energy computation model, superheated vapor energy computation model, saturation water energy computation model.

Model in the computing module 2 obtains energy medium by the form in the data query structure connection database 1 and quantizes to calculate needed data, can obtain the energy parameter of energy medium.The data that wherein quantize to calculate need have two kinds: a kind of is the production process data, comprises flow, temperature and pressure, and then obtains the thermodynamic data of pure material according to medium temperature and pressure, such as specific enthalpy, the specific entropy of steam and saturation water; Another kind is analysis data, comprises the calorific value of fuel, mixing gas component dividing potential drop etc.Obtain chemical reaction Standard Enthalpies, chemical reaction standard according to the dividing potential drop of mixed gas in conjunction with standard enthalpy of formation, the standard formation entropy of pure material

Process data acquisition module 3 gathers real-time or historical industrial process data by DCS system (industries process control system), such as data such as quality, flow, mean pressure, medial temperatures, image data is stored in the data-carrier store 4 according to different instrument items.

As shown in Figure 2, in computing module 2, data structure and the computing formula of fuel energy computation model 21 are as follows:

(a) feed coal energy computation model:

The feed coal energy calculates the model data structure

The mode input parameter is quality, signature coefficient, water cut.

Wherein, quality obtains by the instrument item; The signature coefficient obtains by the logistics medium number associated signature coefficient table 12 of feed coal, and water cut ω obtains by the laboratory analysis data, notes unit conversion.

Output parameter is chemical enthalpy, heat

Chemistry enthalpy and heat Obtain by following computing formula:

Chemistry enthalpy Q=quality * signature coefficient * 7000 * 4.1868 (1)

Heat E _XQ=quality * (Q+2438 ω) (2)

The calorific value of every kilogram of standard coal equivalent of GB regulation is 7000kcal, and by the different separately calorific values standard coal equivalent that to be converted into every kg calorific value be 7000kcal, 7000 units are kcal/kg in the formula with the energy of different cultivars, different content; 1kcal=4.1868kJ; ω is the water cut of feed coal; 2438 is water latent heat, and unit is kJ/kg.Hereinafter the same.

(b) oily energy computation model:

The oil energy calculates the model data structure

The mode input parameter is flow, signature coefficient.

Wherein, flow obtains by the instrument item; The signature coefficient obtains by the logistics medium number associated signature coefficient table 12 of oil, notes unit conversion.

Output parameter is chemical enthalpy, heat

Chemistry enthalpy Q=quality * signature coefficient * 7000 * 4.1868 (kJ/kg) (3)

Heat E _XQ=0.975Q (4)

(c) electric flux computation model:

Electric flux computation model data structure

The mode input parameter is electric weight, signature coefficient, and electric weight obtains by the instrument item, and the signature coefficient obtains by the logistics medium number associated signature coefficient table 12 of electricity, notes unit conversion.

Output parameter be enthalpy,

Enthalpy,

=electric weight * signature coefficient * 7000 * 4.1868 (5)

Data structure and the computing formula of steam energy computation model 22 are as follows:

(i) saturated vapour energy computation model:

The saturated vapour energy calculates the model data structure

Saturated vapour flow, medial temperature, the mean pressure of mode input parameter for obtaining by the instrument item

Results of intermediate calculations is by searching temperature or pressure at saturated vapour thermodynamic data table 13, the specific enthalpy HG of acquisition and specific entropy SG.

Output parameter be enthalpy, entropy,

Saturated vapour enthalpy=flow * specific enthalpy (6)

Saturated vapour entropy=flow * specific entropy (7)

The physics of saturated vapour

E _XPh=-(H ₀-H)+T ₀(S ₀-S)=(H-H ₀)-T ₀(S-S ₀) (8)

Wherein, H is saturated vapour enthalpy under the physical condition; S is saturated vapour entropy under the physical condition; H ₀Be benchmark attitude saturated vapour enthalpy; S ₀Be benchmark attitude saturated vapour entropy; T ₀Be benchmark attitude temperature.Saturated vapour benchmark attitude is 25 ℃, 0.10133MPa aqueous water, or 25 ℃, 3.169kPa saturated vapour are the benchmark attitude, and this model calculates and gets 25 ℃, 3.169kPa saturated vapour for the benchmark attitude of steam.

(ii) superheated vapor energy computation model:

The superheated vapor energy calculates the model data structure

In the situation that superheated vapor only has physical change, the mode input parameter is flow, medial temperature, mean pressure, obtains by the instrument item.

Results of intermediate calculations is specific enthalpy and specific entropy, obtains by looking into superheated vapor thermodynamic data table 14.

Output parameter be enthalpy, entropy,

Superheated vapor enthalpy=flow * specific enthalpy (9)

Superheated vapor entropy=flow * specific entropy (10)

Superheated vapor

: E _XPh=-(H ₀-H)+T ₀(S ₀-S)=(H-H ₀)-T ₀(S-S ₀) (11)

Wherein, H is saturated vapour enthalpy under the physical condition; S is saturated vapour entropy under the physical condition; H ₀Be benchmark attitude saturated vapour enthalpy; S ₀Be benchmark attitude saturated vapour entropy; T ₀Be benchmark attitude temperature.Saturated vapour benchmark attitude is 25 ℃, 0.10133MPa aqueous water, or 25 ℃, 3.169kPa saturated vapour are the benchmark attitude, and this model calculates and gets 25 ℃, 3.169kPa saturated vapour for the benchmark attitude of steam.

(ii) superheated vapor energy computation model:

The superheated vapor energy calculates the model data structure

In the situation that superheated vapor only has physical change, the mode input parameter is flow, medial temperature, mean pressure, obtains by the instrument item.

Results of intermediate calculations is specific enthalpy and specific entropy, obtains by looking into superheated vapor thermodynamic data table 14.

Output parameter be enthalpy, entropy,

Superheated vapor enthalpy=flow * specific enthalpy (9)

Superheated vapor entropy=flow * specific entropy (10)

Superheated vapor

: E _XPh=-(H ₀-H)+T ₀(S ₀-S)=(H-H ₀)-T ₀(S-S ₀) (11)

Wherein, H is saturated vapour enthalpy under the physical condition; S is saturated vapour entropy under the physical condition; H ₀Be benchmark attitude saturated vapour enthalpy; S ₀Be benchmark attitude saturated vapour entropy; T ₀Be benchmark attitude temperature.Saturated vapour benchmark attitude is 25 ℃, 0.10133MPa aqueous water, or 25 ℃, 3.169kPa saturated vapour are the benchmark attitude, and this model calculates and gets 25 ℃, 3.169kPa saturated vapour for the benchmark attitude of steam.

(iii) saturation water energy computation model:

The saturation water energy calculates the model data structure

The mode input parameter is flow, medial temperature, obtains by the instrument item.

Results of intermediate calculations is by searching temperature or pressure at saturated vapour thermodynamic data table 13, the specific enthalpy HF of acquisition and specific entropy SF.

Output parameter be enthalpy, entropy,

Enthalpy=flow (m ³) * 1000 * specific enthalpy (12)

Entropy=flow (m ³) * 1000 * specific entropy (13)

E _Xph＝-(H ₀-H)+T ₀(S ₀-S)＝(H-H ₀)-T ₀(S-S ₀) (14)

Wherein, H is saturation water enthalpy under the physical condition; H ₀Be benchmark attitude saturation water enthalpy; T is actual temperature; T ₀Be benchmark attitude temperature; S is saturation water entropy under the physical condition; S ₀Be benchmark attitude saturation water entropy.The benchmark attitude take the status of criterion as saturation water wherein.

Data structure and the computing formula of mixing material energy computation model 23 are as follows:

The mixing material energy calculates the model data structure

The mode input parameter is volumetric flow rate, medial temperature, mean pressure, density, mean specific heat.

Wherein, flow, medial temperature, mean pressure obtain by the instrument item; Density and mean specific heat obtain by looking into liquid heat power mathematic(al) parameter table 16.

Output parameter be enthalpy, entropy,

The rich methanol liquid of incompressible liquid such as gas liquor, low-temperature rectisol, sulfur removing pregnant solution etc., Cp=Cv=C.Pressure is very little on the enthalpy of liquid and the impact of entropy with respect to temperature variation, ignores at this, thereby can calculate by desirable level meter.

Fluid flow is by volume flow metering generally, and the conversion relation of volumetric flow rate and mass rate is: mass rate=volumetric flow rate * density

$\underset{.}{..}\mathrm{dH}=C_p\mathrm{dT}+[V-T{\left(\frac{\∂V}{\∂T}\right)}_P]\mathrm{dp},\mathrm{dS}=C_p\frac{\mathrm{dT}}{T}-{\left(\frac{\∂V}{\∂T}\right)}_p\mathrm{dp}$

The specific enthalpy of ∴ mixing material: h=C _p(T-T ₀)

Enthalpy=the flow of mixing material * specific enthalpy (15)

The specific entropy of mixing material $s=C_p\ln \frac{T}{T_0}$

Entropy=the flow of mixing material * specific entropy (16)

Mixing material

$\mathrm{Ex}=(H-H_0)-T_0(S-S_0)=C_p(T-T_0)-T_0{C}_p\ln \frac{T}{T_0}---\left(17\right)$

Wherein, Cp is the mixing material mean specific heat; H is liquid enthalpy under the physical condition; S is liquid entropy under the physical condition; H ₀Be benchmark attitude liquid enthalpy; S ₀Be benchmark attitude liquid entropy; V is the liquid volume flow; T is actual temperature; T ₀Be benchmark attitude temperature.Benchmark attitude take the status of criterion as mixing material.

Data structure and the computing formula of mixed gas energy computation model 24 are as follows:

(u) mixed gas physical change computation model:

Mixed gas physical change energy calculates the model data structure

The mode input parameter is flow, medial temperature, mean pressure, partial component pressure, average specific heat at constant pressure appearance (enthalpy), average specific heat at constant pressure appearance (entropy).

Wherein, flow, medial temperature, mean pressure obtain by the instrument item; Partial component pressure obtains by the technological process mixing gas component 11 of medium association; Average specific heat at constant pressure holds (enthalpy) and average specific heat at constant pressure holds (entropy) by the ideal gas specific heat capacity coefficient table 151 calculating acquisitions in the mixed gas thermodynamic parameter summary table 15.

Output parameter: physics enthalpy change, physics Entropy Changes, physics

The general semi-invariant of flow is the amount under the design conditions, calculate the mole value, calculates enthalpy again; Its computing method are:

Volumetric flow rate under the amount=status of criterion of compounding substances/0.0224 (mol)

Volumetric flow rate under the status of criterion Wherein be designated as down the design conditions that is of D.

The ideal gas mixture average specific heat at constant pressure holds (T ₁～T ₂Average specific heat at constant pressure in the temperature range holds), namely be used for the specific heat at constant pressure that enthalpy calculates:

$\underset{i}{\mathrm{\Σ}}{n}_i\frac{C_{\mathrm{pmh}}^{*}}{R}=\underset{i}{\mathrm{\Σ}}{n}_i{A}_i+\left(\underset{i}{\mathrm{\Σ}}{n}_i{B}_i\right)T_{\mathrm{am}}+\left(\underset{i}{\mathrm{\Σ}}{n}_i{C}_i\right)\left[\frac{1}{3}(4{T_{\mathrm{am}}}^2-T_1{T}_2)\right]+\left(\underset{i}{\mathrm{\Σ}}{n}_i{D}_i\right){T_1}^{-1}{T_2}^{-1},---\left(18\right)$

T wherein _AmThe arithmetic mean temperature, n _iThe amount of each component of mixed gas,

That the mixed gas average specific heat at constant pressure holds,

Be the thermodynamics medial temperature.

Be used for the specific heat at constant pressure that entropy calculates

$\underset{i}{\mathrm{\Σ}}{n}_i\frac{C_{\mathrm{pmh}}^{*}}{R}=\underset{i}{\mathrm{\Σ}}{n}_i{A}_i+\left(\underset{i}{\mathrm{\Σ}}{n}_i{B}_i\right)T_{\mathrm{lm}}+\left(T_{\mathrm{am}}{T}_{\mathrm{lm}}\right)(\underset{i}{\mathrm{\Σ}}n{C}_i+\underset{i}{\mathrm{\Σ}}{n}_i{D}_i{T_1}^{-2}{T_2}^{-2})---\left(19\right)$

The physics enthalpy change of mixed gas: $\mathrm{\ΔH}=C_{\mathrm{pmh}}^{*}(T-T_0)---\left(20\right)$

The physics Entropy Changes of mixed gas: $\mathrm{\ΔS}=C_{\mathrm{pms}}^{*}\ln \frac{T}{T_0}-R\ln \frac{p}{p_0}.---\left(21\right)$

The physics of mixed gas

${\mathrm{Ex}}_{\mathrm{ph}}=(H-H_0)-T_0(S-S_0)=C_{\mathrm{pmh}}^{*}(T-T_0)-T_0[C_{\mathrm{pms}}^{*}\ln \frac{T}{T_0}-R\ln \frac{p}{p_0}]---\left(22\right)$

Wherein,

That mixed gas is used for the specific heat at constant pressure that enthalpy calculates,

It is the specific heat at constant pressure that calculates for entropy; T is actual temperature; T ₀Be benchmark attitude temperature; H is gas enthalpy under the physical condition; S is gas entropy under the physical condition; H ₀Be benchmark attitude gas enthalpy; S ₀Be benchmark attitude gas entropy; P is actual pressure; p ₀Be benchmark attitude pressure.Benchmark attitude take the status of criterion as mixed gas.

(v) mixed gas chemical reaction energy computation model

Mixed gas chemical reaction energy calculates the model data structure

The mode input parameter is flow, medial temperature, mean pressure, average specific heat at constant pressure appearance (enthalpy), average specific heat at constant pressure appearance (entropy).

Wherein, flow, medial temperature, mean pressure obtain by the instrument item; Average specific heat at constant pressure holds (enthalpy) and average specific heat at constant pressure holds (entropy) by the calculating of the ideal gas specific heat capacity coefficient table in mixed gas thermodynamic parameter summary table acquisition.

Results of intermediate calculations is physics enthalpy change, physics Entropy Changes, physics

, standard chemical enthalpy, standard chemical entropy, standard chemical

Wherein, standard chemical enthalpy, standard chemical entropy, standard chemical

Becoming Entropy Changes table 152 by the standard enthalpy of formation in the mixed gas thermodynamic parameter summary table 15 obtains.

Output parameter: enthalpy, entropy,

Comprised physical change process in the mixed gas chemical reaction energy computation model, so enthalpy entropy in the output parameter

The result be physical change and chemical change enthalpy entropy

Sum, wherein physics enthalpy change, physics Entropy Changes, physics

Calculating as above save described.

The enthalpy of mixed gas=physics enthalpy change+chemical enthalpy (23)

The entropy of mixed gas=physics Entropy Changes+Chemistry Entropy (24)

Mixed gas =physics

+ chemistry

(25)

Computing formula all is based on the thermodynamic function of the stable energy medium that the status of criterion draws in the above model, and the below further specifies structure and the course of work of industrial energy calculation system of the present invention take certain manufacturing enterprise's energy medium as example.

S1: be mixed gas, water, mixing material, steam, coal, electricity, wet goods according to material characteristic with the enterprise energy medium classification, definition medium number by integrating analysis data, thermodynamic parameter table, is set up data structure linked database 1.The coding of medium number can number to define in conjunction with national regulation code and enterprise's energy medium, guarantees uniqueness.

Data structure linked database 1 comprise technological process mixing gas component table 11, enterprise energy signature coefficient table 12, saturated vapour thermodynamic data table 13, superheated vapor thermodynamic data table 14,, mixed gas thermodynamic parameter summary table 15, liquid heat power mathematic(al) parameter table 16.

Technological process mixing gas component table 11

Enterprise energy signature coefficient table 12

Saturated vapour thermodynamic data table 13

The sample data of saturated vapour thermodynamic data table 13:

Superheated vapor thermodynamic data table 14

The sample data of superheated vapor thermodynamic data table 14:

Superheated vapor thermodynamic data table 14 is contained each other pressure of steam level in the actual production according to production run, again with temperature value inquiry specific enthalpy and specific entropy.Adopt the specific enthalpy under linear interpolation method acquisition actual temperature and the pressure and compare entropy.Below be example:

Data when adopting 500 ℃ of twice method of interpolation tests, 10000kPa:

500 ℃, 8MPa enthalpy=(3642-3138.3) * (500-400)/(600-400)+3138.3=3390.2

Relative error e=(3398.3-3390.2)/3398.3=0.24%

500 ℃, 8MPa entropy=(7.0206-6.3634) * (500-400)/(600-400)+6.3634=6.692

Relative error e=(6.724-6.692)/6.724=0.48%

500 ℃, 15MPa enthalpy=(3582.3-2975.5) * (500-400)/(600-400)+2975.5=3278.9

Relative error e=(3308.6-3278.9)/3308.6=0.90%

500 ℃, 15MPa entropy=(6.6776-5.8811) * (500-400)/(600-400)+5.8811=6.27935

Relative error e=(6.3443-6.27935)/6.3443=1.0%

500 ℃, 10MPa enthalpy=(3278.9-3390.2) * (10000-8000)/(15000-8000)+

3390.2＝3358.4

Relative error e=(3373.7-3358.4)/3373.7=0.45%

500 ℃, 10MPa entropy: (6.27935-6.692) * (10000-8000)/(15000-8000)+6.692=6.574

Relative error e=(6.5966-6.574)/6.5955=0.34%

Empirical tests, relative error e is the industrial data tolerance interval all below 1%.

Ideal gas specific heat capacity coefficient table 151

Chemical substance	Molecular formula	A	10e3B	10e6C	10e-5D
						Carbon dioxide	CO2	5.457	1.045	0	-1.157
Sulfuretted hydrogen	H2S	3.931	1.490	0	-0.232
						Carbon monoxide	CO	3.376	0.557	0	-0.031
Hydrogen	H2	3.249	0.422	0	0.083
						Methane	CH4	1.702	9.081	-2.164	0
Nitrogen	N2	3.280	0.593	0	0.040
						Argon	Ar	0	0	0	0

Oxygen	O2	3.639	0.506	0	-0.227
						Water	H2O	3.470	1.450	0	0.121
Ammonia	NH3	3.578	3.020	0	-0.186
						Air		3.355	0.575	0	-0.016
Ethanol	C2H6O	3.518	20.001	-6.002	0
						Ethene	C2H4	1.424	14.394	-4.392	0

Standard enthalpy of formation becomes, Entropy Changes table 152

Mixed gas thermodynamic parameter summary table 15

The sample data of mixed gas thermodynamic parameter summary table 15:

Liquid heat power mathematic(al) parameter table 16

S2: take the enterprise energy medium classification of above-mentioned mixed gas, water, mixing material, steam, coal, electricity, oil as basis, the energy computing formula of design and calculation module 2.According to data structure linked database 1 and energy computing formula, set up the energy computation model of different energy medium, quantization method adopt signature method, enthalpy method,

Three kinds of value methods, with enthalpy, entropy,

Thermodynamic function carries out energy expresses, and characterizes with the data structure form.

The calculation procedure of energy source data is as follows:

1) process data acquisition module 3 is with the production process data in the DCS system (industries process control system) and concrete medium number associated analysis data, and for example temperature, pressure parameter deposit in the data-carrier store 4;

2) according to the input data in the data-carrier store 4, the actual specific enthalpy, specific entropy that obtains the medium correspondence by data structure linked database 1 as calculate enthalpy, entropy,

Intermediate result;

3) in computing module 2, obtain the analysis datas such as mixing gas component dividing potential drop, calorific value of actual material by data structure linked database 1, and then obtain the parameters such as medium number corresponding standard enthalpy of formation, standard formation entropy, finally obtain the energy datum of energy medium.

Should be pointed out that the above embodiment can make the invention of those skilled in the art's comprehend, but do not limit the present invention in any way creation.Therefore; although this instructions has been described in detail the invention with reference to drawings and Examples; but; those skilled in the art are to be understood that; still can make amendment or be equal to replacement the invention; in a word, all do not break away from technical scheme and the improvement thereof of the spirit and scope of the invention, and it all should be encompassed in the middle of the protection domain of the invention patent.

Claims (1)

1. an industrial energy calculation system is characterized in that: comprise process data acquisition module and computing module; The industrial process data that the process data acquisition module will gather in industries process control system deposits data-carrier store in, and data-carrier store is inputted described industrial process data respectively in thermodynamic parameter table and the computing module; Results of intermediate calculations searched or calculates by the thermodynamic parameter table according to industrial process data, computing module has been set up different energy computation models according to the characteristics of different-energy medium, the industrial process data in the energy computation model calling data storer and utilize the enthalpy that results of intermediate calculations is calculated and output is corresponding that the thermodynamic parameter table obtains, entropy and

Wherein, described industrial process data comprises mass parameter, flow parameter, electrical parameter, mean pressure parameter, medial temperature parameter; Described energy computation model comprises fuel energy computation model, steam energy computation model, mixing material energy computation model, mixed gas energy computation model;

When described energy medium was fuel, the fuel energy computation model comprised feed coal energy computation model, oily energy computation model and electric flux computation model;

It is quality, signature coefficient and water cut that the feed coal energy calculates the mode input parameter; Output parameter is chemical enthalpy, heat

Q=quality * signature coefficient * 7000*4.1868

E _XQ=quality * (Q+2438 ω)

Wherein, Q is chemical enthalpy; E _XQBe heat

ω is the water cut of feed coal; The signature coefficient obtains by the signature coefficient table;

It is flow, signature coefficient that the oil energy calculates the mode input parameter; Output parameter is chemical enthalpy, heat

Q=flow * signature coefficient * 7000*4.1868

E _XQ=0.975Q

Wherein, Q is chemical enthalpy; E _XQBe heat

The signature coefficient obtains by the signature coefficient table;

Electric flux computation model input parameter is electric weight, signature coefficient; Output parameter be enthalpy,

Q=E _XQ=electric weight * signature coefficient * 7000*4.1868

Wherein, Q is enthalpy; E _XQFor

The signature coefficient obtains by the signature coefficient table;

When described energy medium was steam, steam energy computation model input parameter was flow, medial temperature, mean pressure; Results of intermediate calculations is specific enthalpy and specific entropy, obtains in saturated vapour or superheated vapor thermodynamic data table by medial temperature or mean pressure; Output parameter be enthalpy, entropy and

H=flow * specific enthalpy

S=flow * specific entropy

E _XPh=-(H ₀-H)+T ₀(S ₀-S)=(H-H ₀)-T ₀(S-S ₀)

Wherein, H is the enthalpy of steam under the physical condition; S is the entropy of steam under the physical condition; E _XPhFor steam under the physical condition

H ₀Enthalpy for benchmark attitude steam; S ₀Entropy for benchmark attitude steam; T ₀Be benchmark attitude temperature; It is the benchmark attitude that this model is got 25 ℃, 3.169kPa saturated vapour;

When described energy medium was mixing material, it was volumetric flow rate, medial temperature, mean pressure, density, mean specific heat that the mixing material energy calculates the mode input parameter; Output parameter be enthalpy, entropy,

Mass rate=V * density

$\mathrm{dH}=C_p\mathrm{dT}+[V-T{\left(\frac{\∂V}{\∂T}\right)}_p]\mathrm{dp}$

$\mathrm{dS}=C_p\frac{\mathrm{dT}}{T}-{\left(\frac{\∂V}{\∂T}\right)}_p\mathrm{dp}$

h=C _p(T-T ₀)

H=mass rate * h

$s=C_p\ln \frac{T}{T_0}$

S=mass rate * s

$\mathrm{Ex}=(H-H_0)-T_0(S-S_0)=C_p(T-T_0)-T_0{C}_p\ln \frac{T}{T_0}$

Wherein, h is the specific enthalpy of mixing material; H is the enthalpy of liquid under the physical condition; S is the specific entropy of mixing material; S is the entropy of liquid under the physical condition; H ₀Be benchmark attitude liquid enthalpy; S ₀Be benchmark attitude liquid entropy; Ex is mixing material V is the liquid volume flow; T is medial temperature; T ₀Be benchmark attitude temperature; Benchmark attitude take the status of criterion as mixing material; P is mean pressure; C _pBe mean specific heat, obtain by liquid heat power mathematic(al) parameter table; DH is the differential of H; DS is the differential of S; DT is the differential of T; Dp is the differential of p;

When described energy medium was mixed gas, mixed gas energy computation model comprised physical change energy computation model and chemical change energy computation model;

It is flow, medial temperature, mean pressure, partial component pressure that described physical change energy calculates the mode input parameter; Results of intermediate calculations is held for the average specific heat at constant pressure that is used for calculating the average specific heat at constant pressure appearance of enthalpy and being used for Calculating Entropy, calculates acquisition by ideal gas specific heat capacity coefficient table; Output parameter is physics enthalpy change, physics Entropy Changes and physics

$\mathrm{\ΔH}=C_{\mathrm{pmh}}^{*}(T-T_0)$

$\mathrm{\ΔS}=C_{\mathrm{pms}}^{*}\ln \frac{T}{T_0}-R\ln \frac{p}{p_0}$

${\mathrm{Ex}}_{\mathrm{ph}}=(H-H_0)-T_0(S-S_0)=C_{\mathrm{pmh}}^{*}(T-T_0)-T_0[C_{\mathrm{pms}}^{*}\ln \frac{T}{T_0}-R\ln \frac{p}{p_0}]$

Wherein, Δ H is the physics enthalpy change; Δ S is the physics Entropy Changes; Ex _PhBe physics

To hold for the average specific heat at constant pressure that calculates enthalpy,

Be the average specific heat at constant pressure appearance for Calculating Entropy, T is medial temperature, T ₀Be benchmark attitude temperature, H is the enthalpy of mixed gas under the physical condition; S is the entropy of mixed gas under the physical condition; H ₀Be benchmark attitude enthalpy; S ₀Be benchmark attitude entropy, p is mean pressure; R is gas constant; p ₀Be benchmark attitude pressure; Benchmark attitude take the status of criterion as mixed gas;

Be used for calculating the average specific heat at constant pressure appearance of enthalpy

And the average specific heat at constant pressure that is used for Calculating Entropy holds

Computation process be:

Mixed gas T ₁～T ₂In the temperature range

$\underset{i}{\mathrm{\Σ}}{n}_i\frac{C_{\mathrm{pmh}}^{*}}{R}=\underset{i}{\mathrm{\Σ}}{n}_i{A}_i+\left(\underset{i}{\mathrm{\Σ}}{n}_i{B}_i\right)T_{\mathrm{am}}+\left(\underset{i}{\mathrm{\Σ}}{n}_i{C}_i\right)\left[\frac{1}{3}(4{T_{\mathrm{am}}}^2-T_1{T}_2)\right]+\left(\underset{i}{\mathrm{\Σ}}{n}_i{D}_i\right){T_1}^{-1}{T_2}^{-1}$

Mixed gas T ₁～T ₂In the temperature range

$\underset{i}{\mathrm{\Σ}}{n}_i\frac{C_{\mathrm{pms}}^{*}}{R}=\underset{i}{\mathrm{\Σ}}{n}_i{A}_i+\left(\underset{i}{\mathrm{\Σ}}{n}_i{B}_i\right)T_{\mathrm{lm}}+\left(T_{\mathrm{am}}{T}_{\mathrm{lm}}\right)(\underset{i}{\mathrm{\Σ}}{n}_i{C}_i+\underset{i}{\mathrm{\Σ}}{n}_i{D}_i{T_1}^{-2}{T_2}^{-2})$

Wherein

The arithmetic mean temperature, n _iBe the amount of each component of mixed gas, i is each component numbering, Be the thermodynamics medial temperature, R is gas constant, A _i, B _i, C _i, D _iBe ideal gas specific heat capacity coefficient, obtain by the specific heat capacity coefficient A in the ideal gas specific heat capacity coefficient table, B, C, D;

Input parameter is flow, medial temperature, mean pressure, partial component pressure in the described chemical change energy computation model; Results of intermediate calculations is physics enthalpy change, physics Entropy Changes, physics

Chemistry enthalpy, Chemistry Entropy, chemistry

Output parameter be enthalpy, entropy,

Comprised physical change process in the mixed gas chemical change, so output parameter enthalpy, entropy,

The result be physics enthalpy change, physics Entropy Changes, the physics of physical change Chemical enthalpy, Chemistry Entropy, chemistry with chemical change

Sum, wherein physics enthalpy change, physics Entropy Changes, physics

Computation process such as physical change energy calculate model and state; Chemistry enthalpy, Chemistry Entropy, chemistry

Generating enthalpy change Entropy Changes table by gas standard obtains;

The enthalpy of mixed gas=physics enthalpy change+chemical enthalpy

The entropy of mixed gas=physics Entropy Changes+Chemistry Entropy

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