Centrifugal compressor efficiency types and rational application

Galerkin, Yu. B.; Drozdov, A. A.; Soldatova, K. V.

doi:10.1533/9781782421702.9.533

Cited by 7 publications

(5 citation statements)

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“…Besides, basic conditions such as feed gas information, products requirement and other equipment parameters not determined by the process need to be artificially set. Thus, to further simplify the simulation, additional assumptions are given as follows 39,48 : The pressure, temperature, and flow rate of feed gas are 120 kPa, 40°C and 1000kmol/h, respectively. The adiabatic efficiency of compressors is set as 85%. The temperature of the compressed gas after water cooling is 40°C. Pressure drop in heat exchangers and water coolers is ignored. The storage pressure of LEG and LNG is 120 kPa. Both the purity and recovery rate of ethane are higher than 99.5%. The potential and kinetic energies as well as heat leakage to the environment are ignored. …”

Section: Process Simulation and Optimizationmentioning

confidence: 99%

Design and analysis of cascade liquefaction processes for coproducing liquid ethane and LNG

Lin

2022

Intl J of Energy Research

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Ethane recovery is an important way to increase the economic benefits of unconventional natural gas, such as shale gas. However, current researches did not focus on obtaining high purity and high recovery rate of ethane. In this study, two pure refrigerant cascade natural gas liquefaction processes without (Process 1) or with (Process 2) flash gas recovery are proposed to coproduce high-purity liquefied ethane gas (LEG) and liquefied natural gas (LNG). The proposed processes are combined with advanced distillation methods to reduce the energy consumption through process and energy integration. Aspen HYSYS V11 and genetic algorithm (GA) are used to simulate proposed processes and optimize the refrigeration cycles, respectively. To search the optimal conditions of distillation column, power consumption under different distillation pressure is comparatively analyzed, and the optimal distillation pressure is about 2.7 MPa. According to the optimization results, the specific power consumption of Process 1 is 0.4384 ~0.4584 kWh/Nm 3 (NG), and that of Process 2 is 0.4336 ~0.4503 kWh/Nm 3 (NG) when ethane content is 10% ~40%. Process 2 is preferred for lower power consumption and no material waste.Further study is conducted to research the effect of throttling temperature and ethane content on the system performance of Process 2. In addition, the feasibility exploration of cryogenic compression shows that re-compression of natural gas after distillation is not energy saving for the proposed process.

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Section: Process Simulation and Optimizationmentioning

confidence: 99%

Design and analysis of cascade liquefaction processes for coproducing liquid ethane and LNG

Lin

2022

Intl J of Energy Research

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“…Imp-2 has less uniform outlet flow (the idea to diminish non-uniformity by variable outlet angle was not realized in this candidate). In spite of it the most effective is the stage with Imp-2 designed by principles well proven for 2D impellers [1].…”

Section: Figure 8 Total Polytrophic Efficiency Of Impellers and Stagesmentioning

confidence: 99%

“…Industrial compressor stages with 2D impellers were objects of attention of the elder of authors for decades. Theoretic background, design principles and positive design practice are presented in [1]. 3D impellers have much more complex configuration.…”

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Sample of CFD optimization of a centrifugal compressor stage

Galerkin

Drozdov

2015

IOP Conf. Ser.: Mater. Sci. Eng.

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Industrial centrifugal compressor stage is a complicated object for gas dynamic design when the goal is to achieve maximum efficiency. The Authors analyzed results of СFD performance modeling (NUMECA Fine Turbo calculations). Performance prediction in a whole was modest or poor in all known cases. Maximum efficiency prediction was quite satisfactory to the contrary. Flow structure in stator elements was in a good agreement with known data. The intermediate type stage "3D impeller + vaneless diffuser+ return channel" was designed with principles well proven for stages with 2D impellers. CFD calculations of vaneless diffuser candidates demonstrated flow separation in VLD with constant width. The candidate with symmetrically tampered inlet part 3 2 / b b = 0,73 appeared to be the best. Flow separation takes place in the crossover with standard configuration. The alternative variant was developed and numerically tested. The obtained experience was formulated as corrected design recommendations. Several candidates of the impeller were compared by maximum efficiency of the stage. The variant with gas dynamic standard principles of blade cascade design appeared to be the best. Quasi -3D non-viscid calculations were applied to optimize blade velocity diagrams -non-incidence inlet, control of the diffusion factor and of average blade load. "Geometric" principle of blade formation with linear change of blade angles along its length appeared to be less effective. Candidates' with different geometry parameters were designed by 6 th math model version and compared. The candidate with optimal parameters -number of blades, inlet diameter and leading edge meridian position -is 1% more effective than the stage of the initial design.

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“…The mathematical model calculates the process as Figure 5 illustrates. □-MM calculation, Δ-constant polytropic index [30].…”

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The Current State of the Engineering Method for the Optimal Gas-Dynamic Design and Calculation of Centrifugal Compressor

Galerkin

Rekstin

Soldatova³

et al. 2020

Energies

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In the practice of centrifugal compressor designing, different engineering techniques are widely used because flow motion differential equations cannot be integrated, and Computational fluid dynamics cannot resolve the problem as a whole. Engineering personal computers’ programs are based on experimental data and the gas dynamics theory. The universal modeling method’s (UMM) mathematical model is a set of equations that determine the pressure loss in the elements of the centrifugal compressor flow path. By the earlier versions of the UMM, dozens of process compressors were designed. Several sets of empirical coefficients for stages of different specific speeds were applied. The paper presents the current state of the universal modeling method that was recently improved. The models of the centrifugal compressor characteristic calculation are described. A new model of the loading factor characteristic, an improved version of the compressor efficiency, and being based on a CFD-calculation vaneless diffuser model are samples of the improvements. Careful identification and verification demonstrate effective characteristic simulation with a single set of empirical coefficients. Centrifugal compressor new design examples of a turbo expander unit and a turbocharger are presented. The calculated characteristics are compared with the test results. For both objects, the experiments confirmed the calculated gas-dynamic characteristics with sufficient accuracy for engineering methods.

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Centrifugal compressor efficiency types and rational application

Cited by 7 publications

References 0 publications

Design and analysis of cascade liquefaction processes for coproducing liquid ethane and LNG

Design and analysis of cascade liquefaction processes for coproducing liquid ethane and LNG

Sample of CFD optimization of a centrifugal compressor stage

The Current State of the Engineering Method for the Optimal Gas-Dynamic Design and Calculation of Centrifugal Compressor

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