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Development of Low-noise Device to Clear Smoke
Design notes：Smoke emission is produced in cooking, which is one of the substances cause lung cancer, bladder cancer. Grease and food are oxidative decomposed during the heating process, where in carbohydrates, proteins and other set off chemical reactions; produce fatty acids, alkanes, alkenes, aldehydes, ketones, alcohols, esters, aromatic compounds and heterocyclic compounds. There are a variety of fume purification equipment, but each has its advantages and disadvantages. On the basis of research develop distinctive fume purification equipment. The paper is aimed at research the restaurants soot pollution and noise pollution. Soot and noise pollution are more serious harm to human, with people's living standards improved and more and more rapid development of the catering industry, soot noise pollution is worsening, if out of control, would have serious consequences for society and the human body. Soot machine on the market pay more attention on treating soot, while ignoring the noise control. The design is chosen electrostatic precipitators methods. By comparison, a selection of the filter cloth washing and determine its thickness, designed internal structure electrostatic purifiers. Selected fan model by calculating, series with a silencer in the outlet. According to the fan model determine its size and model, then measuring the actual effect after installation. Fume purification facilities catering minimum removal efficiency limit by size into large, medium and small. The project is designed to scale a single stove. The design is based on a single reference stove heating power corresponding to 1.67 × 10J / h, corresponding to the projected surface area of the stove exhaust hood is 1.2m (1200 * 1000mm). The design was used carrying water collection hood; princeling is the formation of circulating water curtain, after a collision with smoke to purify fumes purposes. The key effect of the impact of the use of water collection hood is form a continuous curtain of water, and need for the circulating water system is cleaned regularly. Noise between 50-60db is within the standard value. Outlet is recommended to set to about 1 meter in front of the exhaust hood, not only can reduce soot spill, but also can help cook reduce the temperature. Air flow is chosen 65 to 70 percent of the amount of exhaust generally, the entire kitchen can be formed negative pressure in order to avoid kitchen smell spill. Fume purification had innovation and improvement design, each kind of fume purification have their own advantages and disadvantages, so this time I combined with the use of filters and electrostatic fume purification equipment in this paper. Filtering can be used organic polymer composites with high suction performance, the direction of the flow direction of the flue gas placed perpendicular or parallel with filter material. Electrostatic deposition method is introduced gas fumes by high voltage electric field, making smoke and particles in flue gas charged under electrostatic force to the movement of the electrode plate and deposited. Comparison of four filters material the cloth to determine the final selection of the filter material. Resistance were measured, each filter oil absorption measured assessment of the extent and easy to clean, and the final comprehensive comparison, in this design, chosen wash cloth as filter material, with two layers, each layer having a thickness of 5mm. This filter placed each piece before and after the electrostatic fume purification equipment. The Electrostatic Air purification equipment, 47pieces of aluminum plate (950*600mm) placed parallel, followed by 40 pieces of aluminum plate (230 * 950mm) with the horizontal 12 ° angle parallel placement, in order to increase the contact area and the fumes distance to improve the oil removal efficiency, and also to prevent the untreated smoke entering the muffler stage hinder silencer effect. The design choice aluminum alloy as electrode plates, which has low density, but the intensity is relatively high, approaching or exceeding quality steel, can be processed into a variety of profiles, with excellent electrical conductivity, thermal conductivity and corrosion resistance, widely used in industry. Heat treated aluminum alloy can be used to obtain good mechanical properties, physical properties and corrosion resistance. Stainless steel is chosen as case material, which is the best resistant to chemical corrosion and electrochemical corrosion in the steel, second only to titanium; resistant, high temperature, but also ultra-low temperature resistance, low temperature resistance, even; strength but not too high resistance to oxidation ; plasticity good process ability called all kinds of plates, pipes and other profiles. In accordance with the market prices of the design cost is about 4,129 Yuan. After fume purification equipment paralleled a silencer to achieve muffler purposes. The silencer consists of six pieces silencers which porous sound-absorbing material and surfaces that light, soft, small bulk density, heat and corrosion resistance. Perforated plate is armor; the thickness is 0.8mm, aperture 0.8mm, perforation rate are 2% and 1% respectively. You can see the different rates of the inner and outer perforated plate. This is based on double perforated structure optimization theory and design. To obtain high absorption over a wide frequency range, it is necessary to use a small perforation. To prevent wear on a large area of a large hole smiling, we consider the use of perforated composite structure. Because of the double micro-perforated sound-absorbing structure as two degrees of freedom system, which broadens the scope of sound absorption bands, improve the absorption coefficient. Flue gas volume produced is 2160m ³ / h, the concentration of 28.8mg / m³. According to national standards, the design of electrostatic oil fume purification equipment efficiency can reached 98.1%.