Theoretical limits on the heat regeneration degree

2020 ◽  
Vol 161 ◽  
pp. 120282
Author(s):  
Alexander Kronberg ◽  
Maxim Glushenkov ◽  
Torben Knoke ◽  
Eugeny Y. Kenig
Keyword(s):  
Heat Regeneration

scholarly journals Molecular dynamic simulation of CO2 absorption into mixed aqueous solutions MDEA/PZ

2017 ◽  
Vol 19 ◽  
pp. 1 ◽  
Author(s):  
Noorlisa Harun ◽  
Emyra Ezzaty Masiren
Keyword(s):  
Intermolecular Interaction ◽  
Md Simulation ◽  
Chemical Engineering ◽  
Time Integration ◽  
Simulation Method ◽  
Hydroxyl Group ◽  
Co2 Absorption ◽  
Engineering Research ◽  
Heat Regeneration ◽  
Amine Absorption

<p>The mixture of amine absorption process is an approach for mitigation of carbon dioxide (CO<sub>2</sub>) from flue gas that produces from power plant. Several experimental and simulation studies have been undertaken to understand this process but the mechanism of CO<sub>2</sub> absorption into the aqueous blended amines such as MDEA/PZ is not well understood and available knowledge within the open literature is limited. The aim of this study is to investigate the intermolecular interaction of the blended MDEA/PZ using Molecular Dynamics (MD) simulation. MD simulation was run under condition 313 K and 1 atm. The thermodynamic ensemble used were 200 ps for NVE and 1 ns for NVT. The periodic boundary is used to visualize the interaction of molecules of the whole system. The simulation method also involved calculation of force field and time integration algorithm.The results were interpreted in terms of Radial Distribution Function (RDF) analysis. It was observed that the hydroxyl group (–OH) of MDEA is more attracted to water molecule compared to amino group (–NH) of MDEA. The intermolecular interaction probability of –OH and –NH group of MDEA with CO<sub>2</sub> in blended MDEA/PZ is higher than using pure MDEA. This finding shows that PZ molecule act as an activator to promote the intermolecular interaction between MDEA and CO<sub>2</sub>.Thus, blend of MDEA with PZ is expecting to increase the absorption rate of CO2 and reduce the heat regeneration requirement.</p><p>Chemical Engineering Research Bulletin 19(2017) 1-11</p>

Heat regeneration in Malone‐type liquid engines using a parallel‐plate thermodynamic pile geometry

1981 ◽  
Vol 52 (6) ◽  
pp. 3876-3883 ◽  
Author(s):  
P. C. Allen ◽  
G. H. Fisher ◽  
W. R. Knight ◽  
D. N. Paulson ◽  
J. C. Wheatley
Keyword(s):  
Parallel Plate ◽  
Heat Regeneration

Analysis of the Dynamics of Gas Turbines and Their Control Systems

1971 ◽  
Vol 93 (3) ◽  
pp. 300-306 ◽  
Author(s):  
L. B. Sarantsev
Keyword(s):  
Control Systems ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Heat Recovery ◽  
Metallurgical Industry ◽  
Power Turbine ◽  
Protection Systems ◽  
Heat Regeneration ◽  
Complete Set ◽  
Open Cycle

The gas turbine units designed by the Neva Works named after V. I. Lenin (NZL) are intended for driving the gas trunkline compressors and electrical generators, and are also used in chemical and metallurgical industry for heat recovery. By July 1, 1969, 320 gas turbines manufactured by NZL had operated under load more than 4.5 million hr and produced over 20 million MWH. Two-shaft and single-shaft gas turbine units manufactured by the NZL are intended for open cycle operation with heat regeneration. The two-shaft arrangements are designed and built to operate with a free power turbine. The specifications for these gas turbine units are given in Table 1. The modern gas turbine units are equipped with control and protection systems which accomplish the automatic control of the unit at its starting and stopping as well as its operating duties. The hydraulic, pneumatic, and electric instruments and regulators are widely used in these systems. The indication and recording of main parameters of the unit are performed by a complete set of these instruments.

Thermoelectric Cooler Based Regenerative Adsorption Refrigeration System for High Temperature Electronics

2007 ◽  
Author(s):  
Ashish Sinha ◽  
Yogendra Joshi ◽  
Bruce H. Storm
Keyword(s):  
Coefficient Of Performance ◽  
Thermoelectric Cooler ◽  
Adsorption Refrigeration ◽  
Evaporator Temperature ◽  
Excess Heat ◽  
High Temperature Electronics ◽  
Bed Temperature ◽  
Heat Regeneration ◽  
A Tec ◽  
Adsorption Cycle

This paper presents the analytical study of a thermoelectric cooler (TEC) based two-stage regenerative adsorption cycle with evaporator temperature ranging from 80°C to 180°C and heat rejection temperature ranging from 200°C to 230°C. This proposed cycle restricts the highest temperature at which the TEC regenerates heat by reducing the maximum bed temperature during the desorption phase, which leads to the possibility of the system being realized with commercially available TECs and a reasonable TEC coefficient of performance (COP∼ 0.4). The low COP (&lt;1) of the TEC results in excess heat at the desorption bed during heat regeneration. If the excess heat is rejected to the environment, COP gains arising from regeneration are reduced. Using the TEC to regenerate only part of the heat helps to mitigate this problem. The adsorption cycle in conjunction with TEC can pump heat through larger temperature differences with system efficiency much greater than that of a TEC used alone under identical conditions. The study aims to extend the limits of the adsorption refrigeration systems to provide compact cooling devices for harsh environments.

scholarly journals A study of transcritical carbon dioxide cycles with heat regeneration

2013 ◽  
Vol 34 (3) ◽  
pp. 197-217
Author(s):  
Marian Trela ◽  
Roman Kwidziński ◽  
Dariusz Butrymowicz
Keyword(s):  
Efficiency Analysis ◽  
Operating Parameters ◽  
Power Cycles ◽  
Power Cycle ◽  
Working Temperature ◽  
Heat Regeneration ◽  
Mass Flows ◽  
Temperature And Pressure ◽  
Transcritical Carbon Dioxide ◽  
Cycle Efficiency

Abstract The paper presents an efficiency analysis of two transcritical CO2 power cycles with regenerative heaters. For the proposed cycles, calculations of thermal efficiency are given for selected values of operating parameters. It was assumed that the highest working temperature and pressure are in the range from 600 to 700 °C and 40 to 50 MPa, respectively. The purpose of the calculations was optimization of the pressure and mass flows in the regenerative heaters to achieve maximum cycle efficiency. It follows that for the assumed upper CO2 parameters, efficiency of 51-54% can be reached, which is comparable to the efficiency of a supercritical advanced power cycle considered by Dostal.

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