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Pulp and paper industry is a highly energy intensive and the drying section of the paper machine consumes 64 % of total energy. The heat of the humid hot air resulting from the drying process has a usable energy potential which has to be recovered and represents a secondary energy resource. This paper analyses efficiency of introducing a complex heat recovery, in three stages, integrated into the...
The article presents the results of experimental studies aimed at the determination of conditions and modes of action by high-intensity ultrasonic vibrations for the acceleration of drying process of the textile materials at high-speed flow of drying agent. To carry out studies it was developed special purpose stand with the radiator of ultrasonic vibrations, which is able to generate vibrations with...
This paper addresses the concrete mode of using the energy of the microwave field in the drying process of wooden sticks used in the food industry. For the numerical analysis of the microwave field we used the COMSOL Multiphysics numerical modelling programme. The experimental measurements were performed using a multimode applicator. The aim of this paper is to present a study on the microwave field...
In order to improve the drying quality and reduce the energy consumption of the black agarics, the application of infrared heating technology and the convection of hot air drying technology combination in the drying process, the weigh of black agarics recorded by the first and the second weighing system and the data were compared with the final moisture drying required. In order to improve the drying...
Individual biomass particle exchanges mass and heat with its surrounding during the thermal conversion process. Therefore environmental conditions around the particle greatly determine the conversion process through which the particle undergoes. It is important to model this relationship between particle and its surroundings during the thermal conversion rather than using random boundary conditions...
This electronic document is a “live” template and already defines the components of your paper Simulation and optimization of the drying process may require the calculation of the water diffusivity of the product. In this work we have described the estimation of the coefficients of diffusion of the moisture in the henna leaves from the drying curves obtained with DVS device. Two different methods...
In terms of the strong coupling between temperature and humidity in grain drying control process, it has the characteristics of non-linear behavior and long delay. This paper proposes a fuzzy compensating decoupling method based on fuzzy control, which does not need the accurate mathematical models and its method has strong applicability. Moreover, its system circuit and simulation results are shown...
Positron-positronium annihilation spectrum were analyzed using four-component fitting procedures. It is shown that this technique can be used to investigation of nanopores transformation in humidity-sensitive MgO- Al2O3 ceramics as porosimetry method. It is established that the third component of lifetime spectra gives information about ortho-positronium decaying in nanopores with water and fourth...
An experimental and numerical study about a typical solar air collector is presented. Transfer equations are deduced from thermal balance on each component of the solar collector. The numerical model is validated with experiments performed with a typical air collector; realized and tested under meteorological condition of Algiers, Algeria. Results obtained, for a collecting area AC = 2 m2 and air...
Modeling of processes is becoming a powerful tool for understanding their dynamic behavior. In coffee drying process, the current models are based on empiric approximations and fluid dynamic studies. These last models are very computationally demanding for control and dynamic analysis purposes. The proposed model is an approximation that permits prediction, optimization and control systems design...
Thermal vacuum processing method of brown coal is presented. The proposed method allows to obtain a fine powder of brown coal with a moisture content of 0.8% and up to 40 nm in a continuous drying and reducing it in the content of sulfur and nitrogen, which reduces harmful emissions into the atmosphere during its combustion to power station. Principle of the developed energy efficiency thermal vacuum...
The determination of the isotherms of sorption is an essential stage to optimize the conditions of drying of products and give a precise information onto the hygroscopic balance. This study aims at determining experimentally the isotherms of sorption by means of the method of the solutions of saturated salts. The curves of sorption so obtained are then approached by empirical and semi-empirical models...
In this paper, at first the term and the technical significance of the degree of polymerization (DP) of cellulose insulation is explained. Factors influencing the DP of new, unused insulation products are detailed. An overview of commonly used DP measuring techniques and standards is given. Depending on the method, the measured DP value of cellulose insulation can vary considerably. The DP loss at...
State-of-the-art marine microalgae utilization processes were proposed and their performance with respect to energy consumption was evaluated. Enhanced process integration technology was developed and applied in continuous integrated energy utilization processes of microalgae. The enhanced process integration was developed based on two main principles, first, conventional process integration and,...
For investigating moisture content variation law of thin layer carrots during hot-air drying, In this paper, the dynamic modeling and drying characteristics were studied, two models were used in the experimental data, the effects of air temperature, air-flow rate and sample thickness on drying kinetics of carrot slices were investigated, and the moisture effective diffusion coefficients were calculated...
Shrinkage is one of the major changes taking place during the drying process. Typically, empirical fitting through experiment data is used to find the shrinkage equation. In this paper, the shrinkage equation was developed on the basis of a simple mechanism of volume of water evaporated during drying and is not dependent on data from experiment. The shrinkage equation was put into the model of heat...
Peeling of Eucalyptus urophylla×grandis with Spindle-less Lathes of type of BXQS1813A and BQK1813C, and veneer drying of six species of Eucalyptus were conducted and analyzed in this paper. The results showed that: the veneer quality by BQK1813C is much better than that by BXQS1813A. The veneer thickness' coefficient of variation decreased firstly and then increased in peeling process, and the influence...
During the process of drying of insulating paper, several parameters, the temperature, pressure and the duration, are carefully controlled. The dried paper contains between 0.2 % and 0.3 % moisture. Actual measurement of moisture in OIP systems in power equipment in service is quite complex. It is therefore essential to estimation of moisture content based on Modelling techniques and subtle verification...
Sludge is the main byproduct of wastewater treatment. Sludge drying process is considered to be the necessary approach for sludge treatment and disposal. The characteristics of sludge drying at different drying stage were experimentally investigated in a plate dryer. Sludge drying process were carried out at different operation parameters, such as different drying temperature, thickness of sludge...
A Feed Forward Neural Network (FFNN) is designed to estimate the moisture content of dried tomato. The experiment is done by a dryer that it was capable of providing any desired drying air temperature, relative humidity and velocity. After getting the practical data, a general FFNN is designed and optimized with Genetic Algorithm (GA) through MATLAB software. Result showed that the configuration of...
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