Effect of the Application of Microwave Energy on the Regeneration of the Adsorbent

Pavlenko

Period. Polytech. Chem. Eng.

et al. 2019

The article is devoted to the study of reducing the technogenic load from high-dose nitrogen pollution of the soil layer by encapsulating granules of nitrogen fertilizers in slowly soluble phosphate-containing membranes. The process of dissolving and washing out of the primordial soil layer of the nutrients from urea, encapsulated by superphosphate shells in soil columns, was studied according to agrochemical techniques. The purpose of the work is to determine the parameters of the investigated process, based on which the previously developed physical model of soil washing of moving nitrogen forms, based on experimental data. The process of changing the loss of nitrogen from the soil when using different types of fertilizers depending on the amount of washing was studied by simulation. Mathematically, the process is described in general terms as a linear differential equation of the first order in partial derivatives. The solution of the equation under the initial and boundary conditions allowed to calculate the parameters of the model describing the nature of changes in the losses of nitrogen from the soil column. Comparison of calculated and experimental data showed a coincidence of values with a correlation coefficient above 0.96 for investigated nitrogen fertilizers with different composition of the phosphate-containing coating.

Section: Literature Reviewmentioning

confidence: 99%

Mathematical Modeling of Nutrient Release from Capsulated Fertilizers

Pavlenko

Period. Polytech. Chem. Eng.

et al. 2019

“…This reduces the loss of the purge air for regeneration [21]. Taking into account the fact that the RF-regeneration of the adsorbent occurs at a lower temperature [18], the purge air costs will be even less. So, the technology of regenerating the adsorbent using the microwave energy is more economical.…”

Section: Discussionmentioning

confidence: 99%

“…Air moves through the volume of the adsorbent, which is a porous medium, from top to bottom (Figure 3). The direction of the purge air movement from top to bottom is adopted in most designs of dryers and is the most acceptable from the point of view of the reliability of the obtaining guaranteed dehydrated compressed air [18] at the exit from the air dryer. After passing through the volume of the adsorbent, the purge air freely leaves the adsorption column.…”

Section: Airflow In the Adsorption Column Htmentioning

confidence: 99%

Particulars of Adsorbent Regeneration With the Use of Microwave Energy

et al. 2019

Self Cite

Energy conservation issues are acute in the world. Compressed air is widely used in the modern industrial production. The production of compressed air is a very energy-intensive process, since most of the energy, which is expended by the compressor, passes into the energy of heating. Compressed air cannot be used in modern production without a prior drying and cleaning. Industrial dryer’s air losses is up to 20% of compressed air additionally. Therefore, the issue of saving air during its drying stage is important. In the presented article, the thermal and aerodynamic processes that occur in the classical adsorption tower with the most modern design are considered. The processes that occur in the adsorption column with the microwave regeneration of the adsorbent are also considered. A comparative analysis of these constructions from the point of view of energy saving is made.

Period. Polytech. Chem. Eng.

“…Drying with the use of microwave heating is characterized by ecological purity [2], absence of thermal inertia and high coefficient of efficiency [3][4][5]. Heating by using the microwave energy has some positive side effects.…”

Section: Introductionmentioning

confidence: 99%

Diagnostics of Uneven Heating of the Adsorbent by Microwave Radiation and Measures to Increase the Uniformity of Its Heating

Dobrotvorskiy¹,

Dobrovolska²,

Basova³

et al. 2019

Self Cite

In Europe, 3 % of the electricity consumed by industry is spent on the production of compressed air. At the same time, the payment for electricity consumed by the compressor is the largest share in the structure of the factorys costs. In modern production, compressed air requires drying to meet the requirements of the equipment and for various technological processes. In this case, a large amount of compressed air is lost thus, improving the design of air dryers is an important step for improving energy efficiency. In this paper is developing a method for reducing the energy costs of the heated desiccant dryers is developed by mean of regenerating adsorbents using microwave energy.In the process of developing heaters using microwave energy, the main problem is the achievement of a uniform heating of the material. The same problem also arises when using microwave energy to regenerate the adsorbent in the adsorption dryer. Due of above-mentioned, the problem by dynamically changing the configuration of the heater chamber and waveguide systems is solved by using of increasing the uniformity of heating and two opposite waveguides in the heater design with a variable phase of one of them. A specific condition for conducting experiments is obtained. Particularly the adsorption dryer chamber is a cylindrical vessel that is filled with an adsorbent and has predetermined proportions. A significant change of these proportions adversely affect at the adsorption process during the operation of the desiccant.