Use of waste-gas heat in waste-heat boilers

1974 ◽  
Vol 31 (8) ◽  
pp. 567-568
Author(s):  
V. M. Budov ◽  
Yu. V. Seskutov
Keyword(s):  
Waste Heat ◽  
Waste Gas

Study on Recovery of High Temperature Waste Gas from Rotary Hearth Furnace

2011 ◽  
Vol 415-417 ◽  
pp. 472-477
Author(s):  
Jie Qin ◽  
Gong Guo Liu ◽  
Qiu Ting Wu ◽  
Xiao Le Zha
Keyword(s):  
High Temperature ◽  
Heat Recovery ◽  
Waste Heat ◽  
Social Benefits ◽  
Rotary Hearth Furnace ◽  
Hearth Furnace ◽  
Waste Gas ◽  
Operation Conditions ◽  
The Social ◽  
Titanium Magnetite

The situation of heat recovery of the waste gas with high temperature produced by rotary hearth furnace has been introduced at first, and further more, on the base of actual instance of the pilot which named as comprehensive utilization pilot of vanadium-titanium magnetite in Pangang. Several schemes about the heat recovery of high temperature waste gas have been proposed. The operation conditions of the scheme applied by the pilot also have been introduced. With the application of this scheme, it can make full recovery of the waste heat and 55% of energy can be recovered. Making full use of the heat of waste gas adapts to the social demand of energy conservation and emission reduction and gains better economic and social benefits.

scholarly journals Thermal Analysis of Recuperator Developed for Waste Heat Recycling in Liquid-Fuel Fired Furnaces

2021 ◽  
Vol 39 (1) ◽  
pp. 121-127
Author(s):  
Adekunle Taofeek Oyelami, ◽  
Samuel Babatope Adejuyigbe ◽  
Samuel Olugbenga Olusunle
Keyword(s):  
Thermal Analysis ◽  
Heat Flow ◽  
Liquid Fuel ◽  
Waste Heat ◽  
Melting Furnace ◽  
Environmental Friendliness ◽  
Waste Gas ◽  
Theoretical Pattern ◽  
Double Pipe ◽  
Gas Recycling

Three major parameters for efficient liquid-fuel-fired melting-furnaces include fuel-economy, thermal efficiency and environmental friendliness of operation. These key parameters form the basis for the adoption of recuperator in the waste gas recycling released during many melting operations in furnaces. This work analysed the thermal performance of both cold and hot fluids across the length of a double-pipe recuperator coupled to a ferrous-melting furnace. The thermal analysis carried out was anchored on some basic assumptions including taking the radiant and temperature characteristics of the exiting waste gases from the exhaust of the furnace as being constant over the volume of the furnace while the temperature at various positions on metal surface is equally taken as being constant. In addition, the heat flow transferred from the waste gases to the lining of the furnace is taken to be by convection and it is equal to the heat flow that the lining gives up to the adjourning surrounding. The derived equations were thereafter analysed and subsequently solved. The obtained results were thereafter used to graphically illustrate the variation of temperature of the agents of heat transfer over the entire length of the recuperator at different instances for parallel flow of the constituent working fluids. The analysis was observed to have conformed to a very great extent to the theoretical pattern expected for similar flows.

Optimization of Waste Heat Recovery Power Generation System Applied in Ferroalloy Industry

2011 ◽  
Author(s):  
Yufeng Wang ◽  
Shuai Zhao ◽  
Shien Hui ◽  
Qinxin Zhao ◽  
Qulan Zhou
Keyword(s):  
Power Generation ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Ferroalloy Production ◽  
Thermodynamic Models ◽  
Pressure System ◽  
Waste Gas ◽  
Power Generation Systems ◽  
The Impact

During ferroalloy production, a large quantity of waste gas can be utilized to generate steam and electric power. In this paper, 4 detailed thermodynamic models of single-pressure (SP) and dual-pressure (DP) waste heat recovery power generation systems are presented, to analyze the impact of the steam pressure, steam temperature and pinch temperature difference on power generating capacity. By comparing the performance of typical systems, more reasonable thermodynamic models and their parameters are proposed. It is found that the power generation capacity of dual-pressure system is higher than that of the single-pressure system, but SP system is much simpler. Using superheated steam in deaerator reduces the efficiency of heat recovery power generation systems by 1.8%. The fluctuation of waste gas source affects the power generation greatly. It should be considered when more reasonable ranges for the main parameters are required. With the improvement of thermodynamic system and parameter optimization, the gross power is increased by 15% for SP system and 17% for DP system, corresponding to the steam parameters of 3.0MPa/400°C and 6.0MPa/400°C.

The Inverted Brayton Cycle for Waste-Heat Utilization

1973 ◽  
Author(s):  
D. G. Wilson ◽  
N. R. Dunteman
Keyword(s):  
Waste Heat ◽  
Initial Pressure ◽  
Brayton Cycle ◽  
Waste Heat Boiler ◽  
Waste Gas ◽  
Hot Gas ◽  
Heat Utilization ◽  
Shaft Power ◽  
Waste Heat Utilization ◽  
Returns On Investment

The inverted Brayton cycle, which can be simply defined as one in which hot gas is first expanded through a turbine to low pressure, is then cooled at constant pressure, and lastly, is recompressed to the initial pressure, has been shown to give attractive incremental gains in thermal efficiency, and large returns on investment, when added to a conventional shaft-power gas turbine exhausting into a waste-heat boiler. When the inverted Brayton cycle is applied by itself as a method of obtaining shaft power from the hot waste gas stream, there appears to be range of temperature and pressure ratios at which the cycle is competitive with other methods of waste-heat utilization.

Design Modifications for Energy Conservation of Sponge Iron Plants

2011 ◽  
Vol 3 (1) ◽  
Author(s):  
A. K. Prasad ◽  
R. K. Prasad ◽  
S. Khanam
Keyword(s):  
Heat Recovery ◽  
Waste Heat ◽  
Sponge Iron ◽  
Coal Consumption ◽  
Feed Material ◽  
Capital Costs ◽  
Waste Gas ◽  
Waste Heat Recovery System ◽  
Recovery System ◽  
Heat Recovery System

During the operation in the coal based sponge iron plant, a tremendous amount of heat is generated and significant part of this heat, associated with the waste gas, remains unutilized. It appears worth interesting to modify the process that facilitates the integration of heat available with the waste gas. In the present paper, for the utilization of heat of waste gas, two modifications, namely, case-1 and case-2, are proposed based on preheating of inlet streams. In case-1, preheating of feed material is considered, whereas in case-2, preheating of feed material as well as air is accounted. These cases are then compared with the existing waste heat recovery system of the plant based on coal consumption, operating and capital costs, profit, and payback period. It is found that both cases are better than the existing heat recovery system of the plant. However, case-2 is selected as the best heat recovery option. In comparison to the existing system, case-2 reduces coal and water consumption by 30.5% and 72.6%, respectively. Further, case-2 releases minimum waste gas to the atmosphere that makes the process environment friendly.

Method and Technique of Grade Recovery and Cascade Utilization (GRUC) Based on Sintering and Cooling Integration

2012 ◽  
Vol 268-270 ◽  
pp. 1011-1015
Author(s):  
Guo Wei Xie ◽  
Peng Li ◽  
Hui Dong
Keyword(s):  
Waste Heat ◽  
Economic Feasibility ◽  
Absorption Refrigeration ◽  
Medium Temperature ◽  
Waste Gas ◽  
Hot Air ◽  
Higher Temperature ◽  
Sinter Mixture ◽  
Lower Temperature ◽  
Power Recovery

The key problems and causes of recovery and Utilization of sintering waste heat were analyzed firstly, on the basis of sintering and cooling integration , the method and technique of grade recovery and cascade utilization (GRUC) was put forward according to the first and second laws of thermodynamics. The waste heat was recovered in grades according to the quality firstly, and then different qualities of residual heat recovered were utilized in cascades. The higher temperature part of sinter cooling waste gas was used for power recovery, the medium temperature part was used for direct thermal utilizations, such as drying and preheating of sinter mixture, combustion supporting for ignition, hot air sintering and so on, and the lower temperature part was used for absorption refrigeration. Last, a 360m2 sintering machine of JTC was put forward as an example to validate economic feasibility of the process.

Evaluation and Analysis of Temperature Uniformity for Planar Automotive Waste Heat Thermoelectric Generator

2012 ◽  
Vol 190-191 ◽  
pp. 688-692 ◽  
Author(s):  
Xiao Hong Yuan ◽  
Qiang Sun ◽  
Xian Jun Hou ◽  
Shu Chen ◽  
Zhi En Liu ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Thermoelectric Generator ◽  
Waste Heat ◽  
Fluid Dynamic ◽  
Three Dimensional ◽  
Transfer Model ◽  
Temperature Uniformity ◽  
Uniformity Coefficient ◽  
Waste Gas

The present paper discusses temperature distribution of Thermoelectric Generator (TEG) using automotive waste heat , an index to evaluate the temperature uniformity of hot end box surface of TEG is proposed. Three-dimensional heat transfer model is established to simulate the temperature distribution on hot end box surface of TEG with computational fluid dynamic program FLUENT. The simulation result indicates that under the same topology of thermoelectric modules , the internal structure inside the hot end box could effectively improve the heat transfer between waste gas and hot end box, raising the hot end box surface average temperature by 7.2 percent from 534.2K of to 572.6K ; raising the temperature uniformity coefficient by 4.8 percent from 0.83 to 0.87, the result shows that the waste gas could be utilized more efficiently and generate more output.

Using waste gas heat from a glass furnace in a waste heat boiler

1968 ◽  
Vol 25 (1) ◽  
pp. 21-25 ◽  
Author(s):  
M. Ya. Khinkis ◽  
S. V. Levitin ◽  
L. G. Gol'denberg ◽  
V. Ya. Polyak ◽  
L. I. Zingman
Keyword(s):  
Glass Furnace ◽  
Waste Heat ◽  
Waste Heat Boiler ◽  
Waste Gas
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