Mathematical Modeling of a Solid Waste Incineration System and Steam Generation (original) (raw)
Related papers
Municipal Solid Waste Incinerator Design: Basic Principles
2018
The paper presents some basics and the steps required when the design of an incinerator for heat recovery or waste treatment is being thought of. It is mostly important for designers in developing countries and students where the advanced design tools and computer modelling are not easily accessible. Waste management has become a major concern world‐wide and amidst various waste treatment methods like recycling, composting; incineration is the method that treats the non-reusable and non-organic portion of wastes. Incineration is a complex process due to the heterogonous nature of wastes. Incinerators cannot be designed properly without the knowledge of the combustion science involved and the characteristics of the wastes. Aspects of prime importance in design to be considered are: the incineration mechanisms and their selection, the grate firing systems, furnace geometries, secondary air injection, the 3Ts, the heating value or calorific value of the waste, theoretical Air to Fuel r...
Basic Science Modelling and Simulation of Low Calorific Value Municipal Solid Waste Incineration
2012
ENGLISH/ ABSTRACT (ENGLISH/ ABSTRACT (ENGLISH/ ABSTRACT (ENGLISH/ ANGLAIS The paper focused on the mathematical modellin g and simulation of low calorific value municipal solid waste incineration in semiarid region. Municipal solid wastes were collected and analysed; from which wood samples were taken and incinerated using a prototype incinerator. A mathematical model, based on Fourier series (FS) and finite elements method (FEM) was developed, ran and validated using experimental and literature data. Critical minimum volume of 4.93 m 3 or about 6 % of the total volume of the incinerator would be needed at 20% moisture content refuse and a critical maximum volume of 51.10 m 3 or 69.21% of the total volume, would be needed at 50% moisture content. The ignition time and the time at which the combustion becomes self-sustaining are greatly influenced by the moisture content. Critical drying temperature was found to be 711.44 K. The grid size had little or no effect on the simulated resu...
MODELING AND SIMULATION OF A SOLID WASTE INCINERATION SUSTAINABLE ENERGY SYSTEM
Urban solid waste generation has drastically grown around the world, requiring creative, ecologically correct and sustainable solutions to be developed. This work considers a problem of thermodynamic optimization of extracting the most energy from a stream of hot exhaust produced by urban solid waste incineration, considering a stoichiometric combustion model, when the contact heat transfer area is fixed. For that, a mathematical model is introduced to evaluate the rate of heat generation due to the waste incineration process, and the exergetic (power) rate captured by a heat recovery steam generator (heat exchanger). The numerical results show that when the (cold) receiving stream boils in the counterflow heat exchanger; the thermodynamic optimization consists of locating the optimal capacity rate of the cold current. At the optimum, the cold side of the heat transfer surface is divided into three sections: preheating of liquid, boiling and superheating of steam. Experimental results are in good qualitative and quantitative agreement with the numerically calculated mathematical model results. Microalgae cultivated in large-scale vertical tubular compact photobiorreactors are investigated to treat the emissions produced by the incineration, and to increase the efficiency of the global system via cogeneration of co-products with high aggregated commercial value. NOMENCLATURE A area, m 2 í µí± í µí±í µí± specific heat of steam at constant pressure, J/kg K í µí± í µí± specific heat at constant pressure, J/kg K ℎ í µí± , ℎ í µí± Enthalpy of input and output J/kg í µí±̇ mass flow rate, kg/s í µí± mass M ration of mass flow rates
Development and Performance Evaluation of a Small Scale Municipal Solid Waste Incineration Plant
2021
This study presents the design and testing of a waste-to-energy plant by incineration of small scale municipal solid waste to produce steam for electricity production. The average total waste generated within the study area was found to be 55,800kg/day, with an estimated calorific value of 13,958kJ/kg. The waste samples were collected, dried, shredded and weighed in order to reduce the moisture content to the acceptable minimum and decreases the surface area of the sample that will allow easier penetration of heat. The incinerator was designed using CATIA-5 software. The key performance indices of the developed plant are maximum furnace temperature, residence time, mass flow rate, steam pressures and amount of steam generated keeping the mass of waste constant per test but varying the air flow. The moving grate is inclined at an angle of 12° while the volume of the incineration combustion chamber was calculated to be 0.267m3. 150kg of small scale waste was fed into the combustion ch...
Modelling of a Dual Purpose Plant for Waste Incineration
In the present paper, the modelling of a dual-purpose plant for the production of electrical and thermal energy from the heat treatment of wastes is presented. Particularly, the model has been developed with the aim of performing a study about the simulation of a solid waste incineration process, which involves complex gas-solid reactions, in a fluidized bed combustor. The incineration plant is made of three sections, and namely a RDF combustion section, a flue gas treatment section and a thermal recovery section. This paper is mainly focused on the combustion section. Model results have been compared with the experimental data obtained derived from literature, showing a very good agreement. The proposed model may represent a useful and a reliable instrument to be used in both design and planning of new plants and in control and retrofit of existing plants.
Combustion and Heat Calculations for Incinerator
The design of industrial and municipal incinerators is based on combustion and heat considerationsl The procedures are given for calculating the quantities of air, flue gas, water and heat, as well as the gas temper atures. To assist the reader, a municipal incinerator is used as an example. The relation between refuse analysis and flue gas analysis is explained. Sections on dry and wet dust collection are included.