Experimental Research of Fibrous Materials for Two-Stage Filtration of the Intake Air of Internal Combustion Engines

Abstract

Pollutant properties in intake air to internal combustion engines were analyzed. Mineral dust particles’ influence on accelerated engine components’ wear was discussed. Dust concentration values in the air under various operating conditions in trucks and special vehicles were presented. The idea and necessity for using two-stage filters, operating in a “multi-cyclone–porous partition” system for vehicles operated in dusty air conditions, are presented. Information from the literature information has been presented, showing that impurities in small grain sizes reduce fiber bed absorbency. It has been shown that such a phenomenon occurs during filter material operation, located directly behind the inertial filter (multi-cyclone), which off-road vehicles are equipped with. It results in a greater pressure drop intensity increase and a shorter proper filter operation period. It has been shown that filter material selection for the motor vehicle air filter requires knowledge of the mass of stopped dust per filtration unit area (dust absorption coefficient km) determined for a given permissible resistance value Δpfdop. It has been shown that there is no information on absorption coefficient values for filter materials operating in a two-stage “multi-cyclone–porous partition” separation system. Original methodology and conditions for determining dust absorption coefficient (km) of a separation partition, operating under the conditions of two-stage filtration, were presented. The following characteristics were tested: separation efficiency, filtration performance, and pressure drop characteristics of three different filtration partitions. These were A (cellulose), B (cellulose and polyester), and C (cellulose, polyester, and nanofibers layer), working individually and in a two-stage system—behind the cyclone. Granulometric dust composition dosed into the cyclone and cyclone downstream was determined. During tests, conditions corresponding to air filter’s actual operating conditions, including separation speed and dust concentration in the air, were maintained. For the pressure drop values, the dust absorption coefficient (km) values of three different filtration partitions (A, B, and C), working individually and in a two-stage system—behind the cyclone—were determined experimentally.

Investigation into the Flow of Gas-Solids during Dry Dust Collectors Exploitation, as Applied in Domestic Energy Facilities – Numerical Analyses

“…The dust collector systems were supervised by Beaulac et al [4]. Such a system consists of a cyclone with its centrifugal pump or fan [47] and filtering units [14] and a dust evacuation sub-system, together with dust transport circuits [4]. The cyclones can be divided into square and conventional ones.…”

“…Collection and separation efficiency has also been investigated by others. Dziubak et al [14] researched three different filtration partitions in cyclones (cellulose, cellulose and polyester, cellulose, polyester and nanofibers layer) in order to analyze separation efficiency, filtration performance, and pressure drop.…”

Differences in Performance and Conductivity Persistence of New Reduced Graphene Oxide Air Filter Materials before and after Eliminating Static Electricity

“…At present, many studies have been conducted on air filters [6][7][8][9][10][11][12], and some results have been achieved. The main focus has been on filtration efficiency [6], the use of air filters [7], the effect of combinations of air filter materials [8], the development of new air filter materials [9,10], and so on.…”

“…The main focus has been on filtration efficiency [6], the use of air filters [7], the effect of combinations of air filter materials [8], the development of new air filter materials [9,10], and so on. In addition, extensive research has also been conducted on the performance of car air intake filter materials [11,12]. However, with the continuous changes in the outdoor environment, adjustments in relevant heating measures, changes in urban structure, personnel migration, and the comprehensive impact of the post-pandemic era, people are paying more attention to composite air filter materials that have high efficiency, low resistance, and bactericidal functions [13].…”

Experimental Research on Dynamic Filtering Characteristics of Filter Materials for Electrostatic-Fabric Integrated Precipitator

“…In 2015, the Ministry of Environmental Protection, the Development and Reform Commission, and the National Energy Administration jointly issued a notice on the "Comprehensive implementation of the work plan of ultra-low emission and energysaving transformation of coal-fired power plants", and put forward the requirements of ultra-low emission and ensuring the energy-saving operation of environmental protection equipment for the pollutant control of coal-fired power plants [2,4]. In recent years, the electrostatic-fabric integrated precipitator and bag filter have achieved good results in the treatment of dust and particulate pollutants, but the filter bags on the market are various and the effect is uneven, so the development of an excellent performance of filter bags has important significance [6][7][8][9][10][11].…”