CN109344527A - The quick calculation method of cryogenic liquid expanding machine energy-saving benefit based on * analysis - Google Patents
The quick calculation method of cryogenic liquid expanding machine energy-saving benefit based on * analysis Download PDFInfo
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Abstract
It is based onThe quick calculation method of the cryogenic liquid expanding machine energy-saving benefit of analysis utilizesAnalysis method obtains adding the low temperature saved after liquid expander in space division system according to the inlet and outlet parameter of liquid throttle valve and liquid expanderValue, and then the power that air separation unit compressor is saved is calculated, and consider that the power of liquid expander output obtains the general power saved using air separation unit after liquid expander.The present invention realizes the assessment of the quick calculating to liquid expander energy-saving benefit, necessary benefit calculation foundation is provided for the popularization and application of energy-saving equipment liquid expander, the technological means of benefit evaluation is provided for the investment decision that air separation unit adds liquid expander, the technology upgrading of interior compression low-temperature air subsystem and energy conservation will be promoted to rise and imitate.
Description
Technical field
The present invention relates to energy intensive industrial low-temperature space division fields, and relating to the use of cryogenic liquid expanding machine reduces space division dress
The technology for setting energy consumption, is based on more particularly to one kindThe quick calculation method of the cryogenic liquid expanding machine energy-saving benefit of analysis.
Background technique
Liquid expander make be substitute highly pressurized liquid throttling valve throttling it is novel set energy conservation it is standby, be widely used in advanced internal pressure
In contracting process space division system, the exergy loss in High pressure liquid air pressure reduction can be not only reduced, the energy of space division system is improved
Effect, and liquid expander dog point can also generate various energy-saving benefits using motor recycling choke pressure hair electricity.
The energy-saving benefit for evaluating to accurate science liquid expander will promote air separation unit technological progress and efficiency to be promoted, and promote liquid
The popularization and application of expanding machine.
Analysis is using system available energy as research object, using available energy balance as foundation, in terms of energy quality and quantity two
The use energy situation of valuator device or system not only may indicate that energy is converted as a result, but also can definitely disclose energy conversion
Utilize the essence of internal losses in the process.Analysis is used as a kind of novel method, either the effective use journey in the evaluation energy
Degree aspect, or in terms of transformation, optimization system and energy-saving benefit evaluation, can propose the directive significance of science.Therefore, it utilizesAnalysis method can not only disclose air separation unit and add the energy conservation essence of liquid expander, while can be expanded with scientific evaluation liquid
The energy-saving benefit of machine.But discovery is not based in industry at presentThe liquid expander energy-saving benefit evaluation method of analysis.
Summary of the invention
The purpose of the present invention is to provide one kind to be based onThe quick calculating of the cryogenic liquid expanding machine energy-saving benefit of analysis
Method, to be based onTheoretical method calculates in air separation unit and adds the energy consumption saved after liquid expander, and considers liquid
The power of expanding machine dog point recycling, realizes the evaluation of liquid expander energy-saving benefit.
To achieve the above object, the invention is realized by the following technical scheme:
It is based onThe quick calculation method of the cryogenic liquid expanding machine energy-saving benefit of analysis, includes the following steps,
Step 1 obtains the unit enthalpy h under air regulations benchmark state0With unit entropy s0；
Step 2 obtains the temperature of high-pressure throttle inlet and outlet, the unit enthalpy h under pressurevWith unit entropy sv；
Step 3 utilizes the unit enthalpy h under air regulations benchmark state0, unit entropy s0, high-pressure throttle inlet and outlet
Unit enthalpy h under temperature, pressurevWith unit entropy svCalculate the import entity of high-pressure throttleValue exv1And exporting unitValue exv2, and calculate high-pressure throttleLose Exv；
Step 4 obtains the temperature of liquid expander inlet and outlet, the unit enthalpy h under pressureeWith unit entropy se；
Step 5 utilizes the unit enthalpy h under the temperature of the liquid expander inlet and outlet in step 4, pressureeAnd unit
Entropy se, calculate the import entity of liquid expanderValue exe1And exporting unitValue exe2, then calculate liquid expanderLose Exe；
Step 6 passes through formula Exs=Exv-ExeThe low temperature that space division system adds reduction after liquid expander is calculatedLose Exs；
Step 7 adds the low temperature of reduction after liquid expander based on space division systemLose ExsIt is swollen that liquid is added in calculating
The compressor horsepower W that air separation unit is saved after swollen machinec；
Step 8, it is W that liquid expander, which exports shaft power,e, then according to formula W=Wc+WeIt is calculated and is expanded using liquid
The general power W that air separation unit is saved after machine, realizes the Fast Evaluation of liquid expander energy-saving benefit.
A further improvement of the present invention lies in that the temperature of air regulations benchmark state is in step 1 and step 3
298.15K, the pressure of benchmark state are 101.325kPa.
A further improvement of the present invention lies in that in step 3, according to formula ex=hv-h0-T0(sv-s0) calculate high pressure throttling
The import entity of valveValue exv1And exporting unitValue exv2。
A further improvement of the present invention lies in that in step 3, according to formula Exv=(exv1-exv2)×qmCalculate high pressure section
Flow valveLose Exv, wherein qmFor the flow of High pressure liquid air.
A further improvement of the present invention lies in that in step 5, according to formula ex=he-h0-T0(se-s0) calculate liquid expansion
The import entity of machineValue exe1And exporting unitValue exe2, and according to formula Exe=(exe1-exe2)×qmIt is swollen to calculate liquid
Swollen machineLose Exe。
A further improvement of the present invention lies in that passing through formula in step 7After liquid expander is added in calculating
The compressor horsepower W that air separation unit is savedc, η is to obtain low temperature in air separation unit'sEfficiency.
The beneficial effects of the present invention are: it is of the invention based onThe liquid expander energy-saving benefit evaluation method of analysis is led to
It crossesAnalysis method obtains adding space division system after liquid expander according to the inlet and outlet parameter of liquid throttle valve and liquid expander
The low temperature saved in systemValue, and then the power that air separation unit compressor is saved is calculated, and consider the function of liquid expander output
Rate obtains the general power saved using air separation unit after liquid expander.The method of the present invention, which realizes, imitates liquid expander energy conservation
The quick calculating of benefit, provides necessary benefit estimation foundation for the popularization and application of energy-saving equipment liquid expander, fills for space division
The investment decision that liquid expander is added in setting provides the technological means of benefit evaluation, is conducive to promote interior compression cryogenic air separation
The technology upgrading and energy conservation of device rise effect.
Detailed description of the invention
Fig. 1 be the present invention is based onThe flow chart of the liquid expander energy-saving benefit quick calculation method of analysis.
Specific embodiment
The present invention will be further explained below with reference to examples.
Referring to Fig. 1, it is based onThe quick calculation method of the cryogenic liquid expanding machine energy-saving benefit of analysis, including following step
Suddenly,
Step 1 obtains the unit enthalpy h under air regulations benchmark state using Data Base of Chemical Compound/physical data software0With
Unit entropy s0, the temperature of air regulations benchmark state is 298.15K, and the pressure of benchmark state is 101.325kPa；
Step 2, using under Data Base of Chemical Compound/physical data software acquisition high-pressure throttle inlet and outlet temperature, pressure
Unit enthalpy hvWith unit entropy sv；
Step 3 utilizes the unit enthalpy h under air regulations benchmark state0, unit entropy s0, high-pressure throttle inlet and outlet
Unit enthalpy h under temperature, pressurevWith unit entropy sv, according to formula ex=hv-h0-T0(sv-s0) calculate high-pressure throttle
Import entityValue exv1And exporting unitValue exv2, and according to formula Exv=(exv1-exv2)×qmCalculate high-pressure throttle
'sLose Exv, wherein qmFor the flow of High pressure liquid air；
Step 4, using under Data Base of Chemical Compound/physical data software acquisition liquid expander inlet and outlet temperature, pressure
Unit enthalpy heWith unit entropy se；
Step 5 utilizes the unit enthalpy h under the temperature of the liquid expander inlet and outlet in step 4, pressureeAnd unit
Entropy se, according to formula ex=he-h0-T0(se-s0) calculate liquid expander import entityValue exe1And exporting unit
Value exe2, and according to formula Exe=(exe1-exe2)×qmCalculate liquid expanderLose Exe。
Step 6 passes through formula Exs=Exv-ExeThe low temperature that space division system adds reduction after liquid expander is calculatedLose Exs。
Step 7 in interior compression air separation device, obtains low temperatureTo pass through the equipment such as air compressor machine, supercharger, heat exchanger, because
This passes through formulaCalculate the compressor horsepower W that air separation unit is saved after adding liquid expanderc, η is air separation unit
In obtain low temperature'sEfficiency；
Step 8, it is W that liquid expander, which exports shaft power,e, then according to formula W=Wc+WeIt is calculated and is expanded using liquid
The general power W that air separation unit is saved after machine, realizes the Fast Evaluation of liquid expander energy-saving benefit.
Below by one embodiment, the present invention is described in detail.
Choose certain 35000Nm3Compression space division system is computing object in/h, comprising the following steps:
Step 1 obtains air regulations benchmark state (T=298.15K, P=using Data Base of Chemical Compound/software
Unit enthalpy h under 101.325kPa)0=298.45kJ/kg and unit entropy s0=6.8603kJ/ (kgK).
Step 2 obtains high-pressure throttle inlet temperature T=99.15K, inlet pressure P=using Data Base of Chemical Compound/software
Unit enthalpy h under 5.5MPav1=-83.403kJ/kg and unit entropy sv1=3.3873kJ/kg, outlet temperature T=
Unit enthalpy h under 97.45K, outlet pressure P=0.55MPav2=-83.403kJ/kg and unit entropy se2=3.4515kJ/
kg。
Step 3, according to formula ex=hv-h0-T0(sv-s0) calculate high-pressure throttle importValue exv1=
653.62kJ/kg and outletValue exv2=634.48kJ/kg, and according to formula Exv=(exv1-exv2)×qmCalculate high pressure section
Flow valveLose Exv=(653.62-634.48) × 25.08=479.46kW, wherein qm=25.08kg/s.
Step 4 obtains liquid expander inlet temperature T=99.15K, inlet pressure P=using Data Base of Chemical Compound/software
Unit enthalpy h under 5.5MPae1=-83.403kJ/kg and unit entropy se1=3.3873kJ/kg, outlet temperature T=
Unit enthalpy h under 97.31K, outlet pressure P=0.55MPae2=-89.244kJ/kg and unit entropy se2=3.3915kJ/
kg。。
Step 5, according to formula ex=he-h0-T0(se-s0) calculate liquid expander importValue exe1=
653.62kJ/kg and outletValue exe2=646.53kJ/kg, and according to formula Exe=(exe1-exe2)×qmIt is swollen to calculate liquid
Swollen machineLose Exe=(653.62-646.53) × 25.08=177.82kW, wherein qm=25.08kg/s.
Step 6 passes through formula Exs=Exv-ExeThe low temperature that space division system adds reduction after liquid expander is calculatedLose Exs=479.46-177.82=301.64kW.
Step 7 obtains low temperatureTo pass through air compressor machine, supercharger, heat exchange equipment, in this embodiment, take low temperature
'sEfficiency eta=55%, therefore pass through formulaCalculate the compressor that air separation unit is saved after adding liquid expander
Power
Step 8 considers the power W of liquid expander outpute=135kW, then according to formula W=Wc+WeIt obtains using liquid
After body expanding machine, this set 35000Nm3/ h air separation unit will save general power W=548.44+135=683.44kW.
It is above-mentioned to be based onThe energy-saving benefit fast method of the liquid expander of analysis passes throughTheory throttles according to high pressure
The inlet and outlet parameter of valve and liquid expander, calculates the low temperature of savingValue, in conjunction with low temperature'sEfficiency is added
The compressor horsepower that air separation unit is saved after liquid expander, and consider that the power of expanding machine output adds liquid to calculate
The general power that air separation unit is saved after expanding machine, realizes the quick Calculation Estimation of liquid expander energy-saving benefit.
Described above is only to combine example that a specific embodiment of the invention is illustrated, and is not limited of the invention
Protection scope.The all equivalent variationss made based on the technical solutions of the present invention of industry technical staff, should be included in
In scope of patent protection of the invention.
Claims (6)
1. being based onThe quick calculation method of the cryogenic liquid expanding machine energy-saving benefit of analysis, which is characterized in that including following step
Suddenly,
Step 1 obtains the unit enthalpy h under air regulations benchmark state0With unit entropy s0；
Step 2 obtains the temperature of high-pressure throttle inlet and outlet, the unit enthalpy h under pressurevWith unit entropy sv；
Step 3 utilizes the unit enthalpy h under air regulations benchmark state0, unit entropy s0, high-pressure throttle inlet and outlet temperature,
Unit enthalpy h under pressurevWith unit entropy svCalculate the import entity of high-pressure throttleValue exv1And exporting unitValue
exv2, and calculate high-pressure throttleLose Exv；
Step 4 obtains the temperature of liquid expander inlet and outlet, the unit enthalpy h under pressureeWith unit entropy se；
Step 5 utilizes the unit enthalpy h under the temperature of the liquid expander inlet and outlet in step 4, pressureeWith unit entropy
se, calculate the import entity of liquid expanderValue exe1And exporting unitValue exe2, then calculate liquid expanderDamage
Lose Exe；
Step 6 passes through formula Exs=Exv-ExeThe low temperature that space division system adds reduction after liquid expander is calculatedDamage
Lose Exs；
Step 7 adds the low temperature of reduction after liquid expander based on space division systemLose ExsAfter liquid expander is added in calculating
The compressor horsepower W that air separation unit is savedc；
Step 8, it is W that liquid expander, which exports shaft power,e, then according to formula W=Wc+WeIt is calculated using after liquid expander
The general power W that air separation unit is saved, realizes the Fast Evaluation of liquid expander energy-saving benefit.
2. according to claim 1 be based onThe quick calculation method of the cryogenic liquid expanding machine energy-saving benefit of analysis,
It is characterized in that, in step 1 and step 3, the temperature of air regulations benchmark state is 298.15K, and the pressure of benchmark state is
101.325kPa。
3. according to claim 1 be based onThe quick calculation method of the cryogenic liquid expanding machine energy-saving benefit of analysis,
It is characterized in that, in step 3, according to formula ex=hv-h0-T0(sv-s0) calculate high-pressure throttle import entityValue exv1With
Exporting unitValue exv2。
4. according to claim 1 be based onThe quick calculation method of the cryogenic liquid expanding machine energy-saving benefit of analysis,
It is characterized in that, in step 3, according to formula Exv=(exv1-exv2)×qmCalculate high-pressure throttleLose Exv, wherein qm
For the flow of High pressure liquid air.
5. according to claim 1 be based onThe quick calculation method of the cryogenic liquid expanding machine energy-saving benefit of analysis,
It is characterized in that, in step 5, according to formula ex=he-h0-T0(se-s0) calculate liquid expander import entityValue exe1With
Exporting unitValue exe2, and according to formula Exe=(exe1-exe2)×qmCalculate liquid expanderLose Exe。
6. according to claim 1 be based onThe quick calculation method of the cryogenic liquid expanding machine energy-saving benefit of analysis,
It is characterized in that, in step 7, passes through formulaCalculate the compressor work that air separation unit is saved after adding liquid expander
Rate Wc, η is to obtain low temperature in air separation unit'sEfficiency.
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Cited By (1)
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| CN109884898A (en) * | 2019-03-22 | 2019-06-14 | 河海大学 | A kind of integrated energy system multi-Objective Fuzzy Optimization considering * efficiency |
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| CN108197390A (en) * | 2018-01-04 | 2018-06-22 | 西安交通大学 | A kind of optimum design method of two-phase cryogenic liquid expanding machine anti-cavitation |
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| CN108197390A (en) * | 2018-01-04 | 2018-06-22 | 西安交通大学 | A kind of optimum design method of two-phase cryogenic liquid expanding machine anti-cavitation |
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Cited By (2)
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| CN109884898A (en) * | 2019-03-22 | 2019-06-14 | 河海大学 | A kind of integrated energy system multi-Objective Fuzzy Optimization considering * efficiency |
| CN109884898B (en) * | 2019-03-22 | 2022-01-28 | 河海大学 | Multi-target fuzzy optimization method for comprehensive energy system |
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Effective date of registration: 20210701 Address after: 712000 room 106, B1 / F, West Yungu phase I, Fengxi new town, Xixian New District, Xi'an City, Shaanxi Province Patentee after: Kaishan (Xi'an) Turbine Machinery Co.,Ltd. Address before: Beilin District Xianning West Road 710049, Shaanxi city of Xi'an province No. 28 Patentee before: XI'AN JIAOTONG University |
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