scholarly journals Energy optimisation of vertical shaft kiln operation in the process of dolomite calcination

2018 ◽  
Vol 22 (5) ◽  
pp. 2123-2135 ◽  
Author(s):  
Risto Filkoski ◽  
Ilija Petrovski ◽  
Zlatko Gjurchinovski
Keyword(s):  
Energy Savings ◽  
Waste Heat ◽  
Fuel Oil ◽  
Raw Material ◽  
Heavy Fuel Oil ◽  
High Temperature Heat Treatment ◽  
Shaft Kiln ◽  
Technology Process ◽  
Rotary Kilns ◽  
Energy Optimisation

The essential part of the refractory materials production on a basis of sintered dolomite as raw material is the process of dolomite calcination. The technology process usually takes place in shaft or rotary kilns, where the dolomite stone, CaMg(CO3)2, is subjected to a high temperature heat treatment. The calcination of the dolomite is highly endothermic reaction, requiring significant amount of thermal energy to produce sintered dolomite (CaO, MgO), generating a large flow of hot gases at the furnace outlet. The objective of this work was to assess the possibilities of utilization of waste heat of exhaust gases from a shaft kiln in order to improve the overall energy efficiency of the technology process. Several different options were analyzed: (a) preheating of a raw material, (b) preheating of heavy fuel oil, (c) preheating of combustion air, (d) preheating of combustion air and raw material with flue gas, and (e) preheating of air for combustion and for drying of a raw material. Option (e) was selected as the most attractive and therefore it was analyzed in more details, showing significant annual energy savings and relatively short simple payback period on the investment.

scholarly journals Comparison of Saturated and Superheated Steam Plants for Waste-Heat Recovery of Dual-Fuel Marine Engines

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 985
Author(s):  
Marco Altosole ◽  
Giovanni Benvenuto ◽  
Raphael Zaccone ◽  
Ugo Campora
Keyword(s):  
Natural Gas ◽  
Steam Generator ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Superheated Steam ◽  
Waste Heat ◽  
Rankine Cycle ◽  
Fuel Oil ◽  
Dual Fuel ◽  
Heavy Fuel Oil

From the working data of a dual-fuel marine engine, in this paper, we optimized and compared two waste-heat-recovery single-pressure steam plants—the first characterized by a saturated-steam Rankine cycle, the other by a superheated-steam cycle–using suitably developed simulation models. The objective was to improve the recovered heat from the considered engine, running with both heavy fuel oil and natural gas. The comparison was carried out on the basis of energetic and exergetic considerations, concerning various aspects such as the thermodynamic performance of the heat-recovery steam generator and the efficiency of the Rankine cycle and of the combined dual-fuel-engine–waste-heat-recovery plant. Other important issues were also considered in the comparison, particularly the dimensions and weights of the steam generator as a whole and of its components (economizer, evaporator, superheater) in relation to the exchanged thermal powers. We present the comparison results for different engine working conditions and fuel typology (heavy fuel oil or natural gas).

scholarly journals Degradation of animal malodour

2016 ◽  
Vol 61 (Special Issue) ◽  
pp. S60-S66 ◽  
Author(s):  
I. Janoško ◽  
M. Čery
Keyword(s):  
Alternative Fuels ◽  
Combustion Process ◽  
Fuel Oil ◽  
Raw Material ◽  
Animal Waste ◽  
Economic Costs ◽  
Heavy Fuel Oil ◽  
Direct Combustion ◽  
Thermal Combustion

Animal waste represents a significant threat to the environment. Degradation of waste from dead animals is in general carried out in specialized facilities (rendering plants) under specific rules and guidelines. In plant proximity, undesirable malodour is usually produced during the combustion process. This odour can be effectively reduced so that it does not negatively affect the environment and society. Degradation of animal waste malodour can be processed in ozonisers, thermal combustion devices or in bio washers. The purpose of this paper is to determine the limits of exhausts that are produced during direct combustion of animal waste malodour. The level of ammonia in the combustion air is dependent on the quality of raw material processed at rendering plants where the measurements were carried out. In order to reduce the economic costs, the use of alternative fuels (animal fat, heavy fuel oil) is recommended.

scholarly journals Viability analysis of heat recovery solution for industrial process of roasting coffee

2016 ◽  
Vol 20 (suppl. 2) ◽  
pp. 623-637 ◽  
Author(s):  
Miroslav Kljajic ◽  
Aleksandar Andjelkovic ◽  
Dusan Gvozdenac
Keyword(s):  
Analytical Methods ◽  
Heat Recovery ◽  
Energy Savings ◽  
Waste Heat ◽  
Cost Benefit Analysis ◽  
Complete Solution ◽  
Industrial Process ◽  
Cost Benefit ◽  
Operating Conditions ◽  
Raw Material

Every industrial heat recovery solution is specific engineering challenge but not because predicted energy rationalization or achieved energy savings but potential unavoidable technological deviations and consequences on related processes and for sure, high investment because of delicate design and construction. Often, the energy savings in a particular segment of the industrial process is a main goal. However, in the food industry, especially roasting coffee, additional criteria has to be strictly observed and fulfilled. Such criteria may include prescribed and uniform product quality, compliance with food safety standards, stability of the processes etc., and all in the presence of key process parameters variability, inconsistency of raw material composition and quality, complexity of measurement and analytical methods etc. The paper respects all circumstances and checks viability of proposed recovery solution. The paper analyzes the possibility of using waste heat from the roasting process to ensure shortening of roasting cycle, reduction of fuel consumption and increasing capacity of roasting lines on daily basis. Analysis concludes that effects are valuable and substantial, although the complete solution is on the threshold of economic sustainability with numerous opportunities to improve of both technical and economic indicators. The analysis combines measuring and analytical methods with standard cost-benefit analysis. Conclusions are derived from measurements and calculations of key parameters in the operating conditions and checked by experimental methods. Test results deviate from 10 to 15%, in relation with parameters in main production line.

Biosorption of heavy fuel oil from aqueous solution by Eichhornia crassipes (Mart.) Solms in natura

2021 ◽  
Author(s):  
Laís A. Nascimento ◽  
Marilda N. Carvalho ◽  
Mohand Benachour ◽  
Valdemir A. Santos ◽  
Leonie A. Sarubbo ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Eichhornia Crassipes ◽  
Fuel Oil ◽  
Heavy Fuel Oil

scholarly journals Numerical investigation of the aerodynamic breakup of Diesel and heavy fuel oil droplets

2017 ◽  
Vol 68 ◽  
pp. 203-215 ◽  
Author(s):  
Dionisis Stefanitsis ◽  
Ilias Malgarinos ◽  
George Strotos ◽  
Nikolaos Nikolopoulos ◽  
Emmanouil Kakaras ◽  
...  
Keyword(s):  
Numerical Investigation ◽  
Fuel Oil ◽  
Heavy Fuel Oil ◽  
Oil Droplets

Measurements and predictions of nitric oxide and particulates emissions from heavy fuel oil spray flames

1996 ◽  
Vol 26 (2) ◽  
pp. 2241-2250 ◽  
Author(s):  
M.A. Byrnes ◽  
E.A. Foumeny ◽  
T. Mahmud ◽  
A.S.A.K. Sharifah ◽  
T. Abbas ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Fuel Oil ◽  
Heavy Fuel Oil ◽  
Spray Flames

scholarly journals Comparative sensitivity of the early life stages of a coral to heavy fuel oil and UV radiation

2021 ◽  
pp. 146676
Author(s):  
F. Mikaela Nordborg ◽  
Diane L. Brinkman ◽  
Gerard F. Ricardo ◽  
Susana Agustí ◽  
Andrew P. Negri
Keyword(s):  
Uv Radiation ◽  
Early Life ◽  
Fuel Oil ◽  
Life Stages ◽  
Early Life Stages ◽  
Heavy Fuel Oil ◽  
Comparative Sensitivity

Seawater Scrubbing for the Removal of Sulfur Dioxide in a Steam Turbine Power Plant

2005 ◽  
Author(s):  
Akili D. Khawaji ◽  
Jong-Mihn Wie
Keyword(s):  
Power Plant ◽  
Sulfur Dioxide ◽  
Steam Turbine ◽  
Flue Gas ◽  
Operating Cost ◽  
Cooling Water ◽  
Cost Savings ◽  
Fuel Oil ◽  
So2 Emissions ◽  
Heavy Fuel Oil

The most popular method of controlling sulfur dioxide (SO2) emissions in a steam turbine power plant is a flue gas desulfurization (FGD) process that uses lime/limestone scrubbing. Another relatively newer FGD technology is to use seawater as a scrubbing medium to absorb SO2 by utilizing the alkalinity present in seawater. This seawater scrubbing FGD process is viable and attractive when a sufficient quantity of seawater is available as a spent cooling water within reasonable proximity to the FGD scrubber. In this process the SO2 gas in the flue gas is absorbed by seawater in an absorber and subsequently oxidized to sulfate by additional seawater. The benefits of the seawater FGD process over the lime/limestone process and other processes are; 1) The process does not require reagents for scrubbing as only seawater and air are needed, thereby reducing the plant operating cost significantly, and 2) No solid waste and sludge are generated, eliminating waste disposal, resulting in substantial cost savings and increasing plant operating reliability. This paper reviews the thermodynamic aspects of the SO2 and seawater system, basic process principles and chemistry, major unit operations consisting of absorption, oxidation and neutralization, plant operation and performance, cost estimates for a typical seawater FGD plant, and pertinent environmental issues and impacts. In addition, the paper presents the major design features of a seawater FGD scrubber for the 130 MW oil fired steam turbine power plant that is under construction in Madinat Yanbu Al-Sinaiyah, Saudi Arabia. The scrubber with the power plant designed for burning heavy fuel oil containing 4% sulfur by weight, is designed to reduce the SO2 level in flue gas to 425 ng/J from 1,957 ng/J.

Feasibility Study of a Supercritical Cycle as a Waste Heat Recovery System

2013 ◽  
Author(s):  
Antonio Agresta ◽  
Antonella Ingenito ◽  
Roberto Andriani ◽  
Fausto Gamma
Keyword(s):  
Power Systems ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Power Plants ◽  
Energy Savings ◽  
Waste Heat ◽  
Rankine Cycle ◽  
Waste Heat Recovery System ◽  
Recovery System ◽  
Organic Fluids

Following the increasing interest of aero-naval industry to design and build systems that might provide fuel and energy savings, this study wants to point out the possibility to produce an increase in the power output from the prime mover propulsion systems of aircrafts. The complexity of using steam heat recovery systems, as well as the lower expected cycle efficiencies, temperature limitations, toxicity, material compatibilities, and/or costs of organic fluids in Rankine cycle power systems, precludes their consideration as a solution to power improvement for this application in turboprop engines. The power improvement system must also comply with the space constraints inherent with onboard power plants, as well as the interest to be economical with respect to the cost of the power recovery system compared to the fuel that can be saved per flight exercise. A waste heat recovery application of the CO2 supercritical cycle will culminate in the sizing of the major components.

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