Performance of direct-contact heat and mass exchangers with steam-gas mixtures at subatmospheric pressures

Andrés, M.C. de; Hoo, E.; Zangrando, F.

doi:10.1016/0017-9310(95)00173-5

Cited by 6 publications

(3 citation statements)

References 4 publications

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“…Therefore, different aspects of their experimental investigation, mathematical modeling and optimization can be found in literature. It can be seen even from titles of the papers on the problem in question recently published in various journals [1][2][3][4][5][6][7]. The objective of the present study is to model and optimize the process in a contact heat exchanger from the viewpoint of using them to utilize heat of exhaust gases with high moisture content.…”

Section: Introductionmentioning

confidence: 99%

A Cell Model to Describe and Optimize Heat and Mass Transfer in Contact Heat Exchangers

Mizonov¹,

Yelin²,

Yakimychev³

2011

EPE

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A cell model to describe and optimize heat and mass transfer in contact heat exchangers for utilization of exhaust gases heat is proposed. The model is based on the theory of Markov chains and allows calculating heat and mass transfer at local moving force of the processes in each cell. The total process is presented as two parallel chains of cells (one for water flow and one for gas flow). The corresponding cells of the chains can exchange heat and mass, and water and gas can travel along their chains according to their transition ma-trices. The results of numerical experiments showed that the most part of heat transfer occurs due to moisture condensation from gas and the most intense heat transfer goes near the inlet of gas. Experimental validation of the model showed a good correlation between calculated and experimental data for an industrial contact heat exchanger if appropriate empirical equations were used to calculate heat and mass transfer coefficient. It was also shown that there exists the optimum height of heat exchanger that gave the maximum gain in heat energy utilization

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Section: Introductionmentioning

confidence: 99%

A Cell Model to Describe and Optimize Heat and Mass Transfer in Contact Heat Exchangers

Mizonov¹,

Yelin²,

Yakimychev³

2011

EPE

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“…where c pL is the specific heat at a constant pressure, kJ (kg K) −1 ; L is the mass flow of cooling water, kg h −1 ; T in and T out are the inlet and outlet temperatures of cooling water, °C, respectively; V is the volume from the liquid distributor to the stable liquid level of the tower bottom, indicating the volume used for condensation, m 3 ; ΔT m is the logarithmic average temperature difference during condensation based on the cocurrent packed tower, °C. It is calculated as follows:…”

Section: Total Volume Heat Transfer Coefficient K Vmentioning

confidence: 99%

“…De Andrés et al 3 investigated the condensation characteristics of a direct‐contact condenser in a countercurrent packed tower. A mixed gas composed of subatmospheric steam and noncondensable gas from a power plant was condensed via low‐temperature seawater in the condenser.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on direct‐contact condensation of subatmospheric pressure steam in cocurrent flow packed tower

Chen

Tian

Guo³

et al. 2022

Energy Science & Engineering

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Exhaust steam condensation equipment is an important component in thermal power generation systems. Direct-contact condensation offers high heat transfer efficiency, small flow resistance, simple structure, and less scaling; therefore, its application to exhaust steam condensation equipment is conducive to reducing equipment investment and operation costs. In this study, the direct-contact condensation of subatmospheric pressure steam (exhaust steam) is investigated in a cocurrent flow packed tower. The effects of steam temperature, steam flow, cooling water temperature, and cooling water flow on the condensation rate, subcooling, number of liquid-phase heat transfer units (NTU L ), and total volume heat transfer coefficient (K V ) are investigated. The results show that the direct-contact condensation of exhaust steam can yield a high condensation rate, low subcooling, and good stability in the cocurrent flow packed tower. Lower steam temperature, higher steam flow, higher inlet-water temperature, and lower water flow are conducive to the increase in NTU L . It is discovered that NTU L and K V can be expressed by dimensionless parameters of flow and temperature, and that the empirical correlations of NTU L and K V agree well with experimental data. K E Y W O R D Scocurrent flow packed tower, direct-contact condensation, exhaust steam condensation, number of liquid-phase heat transfer units, subcooling, total volume heat transfer coefficient

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Experimental study of direct contact steam condensation in structured packing

Liu

Cui

et al. 2013

Asia-Pacific J Chem Eng

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An experimental study of direct contact steam condensation has been conducted at both atmospheric and vacuum pressure, in a pilot scale column filled with Tupac 125Y structured packing. The local volumetric heat transfer coefficient of condensation determined by thermal balance has been given. The influences of the vapor and liquid flow rate, liquid temperature and operation pressure have been investigated. An empirical correlation based on dimensionless numbers has been put forward and verified by various experimental measurements, and the dimensionless numbers were calculated from the Delft hydrodynamic model of structured packing. The results will give some helpful guidance in the design and operation of direct contact condensers with structured packings. Specific surface area, a p (m 2 m À3 ) 126.55 Corrugation base length, b (m) 0.042 Corrugation height, h (m) 0.024 Corrugation side length, s (m) 0.0319 Corrugation inclination angle, a ( ) 4 5 Void fraction, e 0.99 Opening ratio, Ω 0.08 X. LI ET AL. Asia-Pacific Journal of Chemical Engineering 658

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Performance of direct-contact heat and mass exchangers with steam-gas mixtures at subatmospheric pressures

Cited by 6 publications

References 4 publications

A Cell Model to Describe and Optimize Heat and Mass Transfer in Contact Heat Exchangers

A Cell Model to Describe and Optimize Heat and Mass Transfer in Contact Heat Exchangers

Experimental investigation on direct‐contact condensation of subatmospheric pressure steam in cocurrent flow packed tower

Experimental study of direct contact steam condensation in structured packing

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