Lab8-Systems

Mining Science and Technology, 1991

Ventilation systems in buidings

2019

With the development of technology and increasing the level of air pollution, people have naturally moved towards the creation of efficient air treatment devices, one of which is a scrubber-a system of dust and gas collecting, applied in a wide range of industrial and processing enterprises. Scrubbing systems are industrial devices designed for cleaning gaseous matters from pollutants. The application of scrubbers includes technological and chemical processes, various fields of industry. The principle of the wet scrubber operation was developed in the early to the mid-19th century. Scrubbing systems are devices of various designs, which are used for cleaning gases with special liquids in order to clear up them and to extract one or several components, as well as drum engines for cleaning mineral resources. Such air treatment devices are widely used for capturing products of coal carbonizing process and cleaning industrial gases from dust, for moistening and cooling gases, in various chemical-technological processes. The principle of the scrubbing system is that the scrubber picks up suspended particulate matters from the exhaust gases. After that, the gas is cleaned with water or a special solution. The process is based on the intensive mixing of gas and liquid. This cleaning technique is called wet air scrubbing. The size of air pollutants increases due to condensation of water vapor on them resulting in efficient air treatment. For example, a hollow nozzle Venturi scrubber is designed to create a high gas flow rate. The gas enters, accelerates in the narrowing part of the scrubbing system, and then mixes with a cleaning solution at high speed. It is widely used for gas moistening and cooling, for air treatment from dust pollutants.

This module looks at centrifugal and axial fans used for ducted ventilation systems and considers selected aspects, including their characteristics and operational attributes. Posted in December 2011 Complete the questionnaire The two common fan types used in building services for ducted systems are generically referred to as centrifugal and axial fans – the name deriving from the defining direction of air flow through the fan. These two types are themselves split into a number of subtypes that have been developed to provide particular volume flow/pressure characteristics, as well as other operational attributes (including size, noise, vibration, cleanability, maintainability and robustness). This CPD unit will consider selected aspects of these fans, and to complement the article there is much good-quality detailed material freely available (see list at the end of this article). This article will attempt to include areas that may not typically be in many of the other general sources.

Mining and Mineral Processing, 2003

paper presents an idea for improving ventilation of big industrial units containing a large number of surface sources of acid vapors. Analysis has been made of incoming air quantities for shop ventilation, location of ventilation points, and distribution of acid vapor cresset. Parameters are explained of existing ventilation system with focus on its problems. For proper direction of contaminated air, it is appropriate to use motor-less, wind-driven roof fans, which are new in world practice. They facilitate natural convection by creating additional draught to direct contaminated air outside the shop and far from working spaces. Parameters of these fans are show and their possible applications. Comparative analysis of their efficiency is presented.

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Engineers, and Designers, today, constantly face the challenge to conceptualise, design and specify cost-effective solution for treating conditioning large volumes of fresh air.