Computer Program to Simulate the Thermal Characteristics of Heat Recovery Incinerators.

1986 ◽  
Author(s):  
C. A. Kodres
Keyword(s):  
Computer Program ◽  
Heat Recovery ◽  
Thermal Characteristics

Analysis of the Combustion Air Preheater from the Aluminum Melting Furnaces

2016 ◽  
Vol 14 (11) ◽  
pp. 27-32
Author(s):  
Aurel Gaba ◽  
Vasile Bratu ◽  
Dorian Musat ◽  
Ileana Nicoleta Popescu ◽  
Maria Cristiana Enescu
Keyword(s):  
Mathematical Model ◽  
Heat Exchanger ◽  
Computer Program ◽  
Flue Gas ◽  
Heat Recovery ◽  
Melting Furnace ◽  
Operating Conditions ◽  
Air Preheater ◽  
Constructive Version ◽  
Scrap Aluminum

Abstract This paper presents solutions and the equipment for preheating combustion air from scrap aluminum melting furnaces through flue gas heat recovery. For sizing convection pre-heaters, there has been developed a mathematical model which has been transcribed into a computer program in C + +. A constructive version of the pre-heater was drawn up and a recovery heat exchanger was manufactured and mounted on an aluminum melting furnace. Both the functional parameters values and the reasons causing the pre-heater worning out, as well as the steps taken for sizing and the achievement of a new air pre-heater able to bear the operating conditions of the aluminum melting furnace are shown.

Cold End Corrosion Avoiding by Using a New Type of Air Combustion Pre-Heater

2017 ◽  
Vol 907 ◽  
pp. 157-163 ◽  
Author(s):  
Maria Cristiana Enescu ◽  
C. Marius Vlădulescu ◽  
Aurel Gaba ◽  
Vasile Bratu ◽  
Elena Valentina Stoian ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Sulfur Dioxide ◽  
Computer Program ◽  
Skin Temperature ◽  
Fuel Economy ◽  
Flue Gas ◽  
Heat Recovery ◽  
Sulfur Trioxide ◽  
Dew Point ◽  
New Type

This paper analyzes the possibility of reducing the cold end corrosion in boilers and furnaces by using a new type of air combustion pre-heater. Cold end corrosion appears due to catalytic oxidation of the sulfur dioxide to sulfur trioxide and then due to the sulfuric acid condensation at dew point. Calculating dew points of various acid gases and options for reducing cold end corrosion of heat recovery exchangers are presented. For avoiding the cold end corrosion we design a new type of air combustion pre-heater for boilers and furnaces. Also, the tube skin temperature of the first row of pipes of the actual air pre-heater was simulated with this computer program, in order to determine whether this temperature is lower than acid dew point of flue gas. With the simulation for this configuration of the actual combustion air pre-heater, the skin temperature for the first row (for the combustion air flow) of tubes from the upper bundle was TS = 134 °C. A way to reduce the cold end corrosion in the combustion air pre-heaters is raising the temperature of the combustion air at the air pre-heater entrance. This solution involves taking a quantity of preheated air, recirculation and then reintroducing it in the air pre-heater. In the same time, this solution avoiding to use the steam radiator, mounted after the fan, for pre-heating the combustion air from 1°C to 45°C. Thus, the furnaces equipped with the new combustion air pre-heater and modern low NOx burners made a fuel economy about 3%.

scholarly journals ENERGY-EFFICIENT HEAT RECOVERY SYSTEM FOR HEATING THE BACKWARD HEATING SYSTEM WATER AND BLAST AIR OF MUNICIPAL BOILERS

2017 ◽  
Vol 39 (4) ◽  
pp. 69-75 ◽  
Author(s):  
R. A. Navrodskaya ◽  
N. M. Fialko ◽  
G. A. Gnedash ◽  
G. A. Sbrodova
Keyword(s):  
Energy Efficient ◽  
Heat Recovery ◽  
Thermal Characteristics ◽  
Heating System ◽  
Heating Equipment ◽  
Air Heating ◽  
Combined Use ◽  
Recovery System ◽  
Heat Recovery System ◽  
System Water

The application of the heat recovery- system with the combined use of the recycled heat of the municipal boiler plants is substantiated. The thermal characteristics of the system and the levels of increase in the efficiency of the boiler with a rational ratio of the areas of heat exchange surfaces of water- and air-heating equipment of this system for different regions of Ukraine are determined.

scholarly journals Computerized Design, Simulation and Feasibility Study of the Heat Recovery System at Jeddah Oil Refinery Company

1993 ◽  
Author(s):  
Essam I. Faqeeh
Keyword(s):  
Computer Program ◽  
Electric Power ◽  
Gas Turbines ◽  
Heat Recovery ◽  
Saturation Temperature ◽  
Combined Cycle ◽  
Oil Refinery ◽  
Utilization Efficiency ◽  
Saturated Steam ◽  
Industrial Gas Turbines

Cogeneration is a very well known and important subject in the industries due to its impact in energy saving and reduction of air pollution. Jeddah Oil Refinery Company (JORC) generates its electric power demand using four industrial gas turbines for a total of 88 MW, while the process steam is produced by four Mitsubishi water tube boilers with a capacity of 50 tons per hour each. The steam condition is at 12 bars gage pressure and 188°C saturation temperature. A computer program “Cogen” has been developed to evaluate the design and off-design performance of the existing four gas turbines at JORC. Accordingly, a heat recovery combined cycle cogeneration system was proposed to utilize the exhaust energy leaving the turbines to fulfill the requirements of the refinery in both electric power and saturated steam. The output results of the computer program are presented in the form of figures. The fuel utilization efficiency of the combined plant has increased to 60% and resulted in approximately 55% reduction in fuel consumption and a payback period of 1.99 years in which the technical and economical feasibility of the proposed system is assured.

Theoretical Thermal Evaluation of Energy Recovery Incinerators—Part II: Parametric Examination

1987 ◽  
Vol 109 (2) ◽  
pp. 84-89
Author(s):  
C. A. Kodres
Keyword(s):  
Heat Exchanger ◽  
Computer Program ◽  
Energy Recovery ◽  
Thermal Characteristics ◽  
Mathematic Model ◽  
Governing Equations ◽  
Combustion Chambers ◽  
Tube Heat Exchanger ◽  
Water Tube

The thermal characteristics of energy recovery incinerators are examined, both parametrically and, to the extent possible, by direct comparison. A mathematic model is employed, using a computer program to solve the governing equations. Three energy recovery configurations are considered: a water tube heat exchanger downstream from the combustion chambers, waterwalls, and a combination of the two. Results show the advantages of combining water walls and a convection boiler.

scholarly journals A Computer Program to Analyze Cogeneration Plant Heat Balances and Equipment Design

1987 ◽  
Author(s):  
J. C. Stewart ◽  
C. F. Hsun
Keyword(s):  
Computer Program ◽  
Steam Turbine ◽  
Gas Turbine ◽  
Heat Balance ◽  
Heat Recovery ◽  
Heat Recovery Boiler ◽  
Process Conditions ◽  
Cogeneration Plant ◽  
Ambient Conditions ◽  
Turbine Performance

This paper describes a computer program designed to calculate and analyze cogeneration plant heat balances and equipment and to plot heat balance diagrams. For normal design point conditions, the program calculates gas turbine performance, designs a heat recovery boiler to suit the process requirements, calculates a steam turbine performance and deaerator balance to complete the cycle. In addition, the program will calculate off-design performance for a supplementary firing option or for changes in ambient conditions, gas turbine part load or process conditions.

A general computer program for the extended plate overlap algorithm

1978 ◽  
Vol 48 ◽  
pp. 287-293 ◽  
Author(s):  
Chr. de Vegt ◽  
E. Ebner ◽  
K. von der Heide
Keyword(s):  
Computer Program ◽  
Simultaneous Determination ◽  
General Computer Program ◽  
General Computer

In contrast to the adjustment of single plates a block adjustment is a simultaneous determination of all unknowns associated with many overlapping plates (star positions and plate constants etc. ) by one large adjustment. This plate overlap technique was introduced by Eichhorn and reviewed by Googe et. al. The author now has developed a set of computer programmes which allows the adjustment of any set of contemporaneous overlapping plates. There is in principle no limit for the number of plates, the number of stars, the number of individual plate constants for each plate, and for the overlapping factor.

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