Technical Analysis: Horizontal scraper Centrifuge siphon principle – centrifuge – Education Industry
Abstract: Horizontal Siphon Scraper Centrifuge Is a new type of centrifuge, it would siphon principle applied to filter scraper discharging centrifuge, centrifuge filter greatly enhanced the driving force of this for improving the productivity and enhance the centrifuge centrifuge separation is a major breakthrough . On the siphon principle a detailed analysis in order to achieve localization of the models and replace the imported products.
Keywords: siphon centrifuge; siphon principle; suspension; filtration rate
CLC number: TH69, China: A Siphon Centrifuge Scraper Horizontal rotating drum driven the use of materials for high-speed rotating drum within the centrifugal force generated when two different densities and immiscible liquid and solid particles in suspension mechanical separation. It is patented in Germany KRAUSSMAFFEI companies to develop three to four years after the series has now Germany, France and Japan and other countries to increase in production Technology Parameters, series, automatic direction. China's current demand for this model is larger and mainly by the introduction. Therefore, to achieve their localization is particularly important.
1 siphon principle Horizontal Siphon Centrifuge Scraper increase compared with the ordinary scraper centrifuge chamber, a siphon and siphon devices. Filtration, the filtrate was filter cloth on the side of the hole through the drum into the siphon chamber, from a stationary liquid siphon to siphon write indoor filtrate leads. Write liquid siphon external connection with a hydraulic mechanism, through the hydraulic fluid charge-regulating siphon siphon position to control the indoor surface. Residue layer thickness based H ', filter media on both sides of the pressure difference is p, the filtration velocity v = k' pH' (the formula k 'for the constant of proportionality). The filtration velocity v and the filter media on both sides of the pressure difference p is proportional to the thickness and the residue H 'is inversely proportional. Siphon filter centrifuge scraper is the other side of the filter medium using siphon principle, increase the pressure difference on both sides of the filter medium, thereby enhancing the filtration rate v. Therefore, the siphon centrifuge scraper centrifuge scraper, compared with ordinary filter, the advantage is significant. Suspensions were divided into two successive filter stages occur: liquid suspension and the filtrate down to the surface residue layer in the filter cake layer to landing. Filtrate through the resistance of different residue continuous layer of residue that is the normal compaction of the filter cake layer and the blade layer (hard slag layer). Different stages of filtration time to be calculated separately, taking into account the different residue levels of total drag. Under the same conditions, siphon scraper centrifuge scraper centrifuge filtration rate faster than normal, and according to different requirements of each operational phase, filtration, drying, and washing is also very easy to adjust the speed.
[HC Education Network with plans] Can be seen from Figure 1, all through the medium of filtrate into the filtrate chamber, the filtrate discharge pipe through the written medium drum, you can change the write-tuck position control of siphon pipe interior surface position, that is, the value of control H . The figure above liquid medium height H0; H siphon chamber surface to the filter medium distance. Siphon scraper centrifuge mode of operation and its advantages are:
(1) stage to reduce H feed value (at least siphon chamber to the filtrate to H negative charge), reduce the filtration rate to form a more uniform thickness of the cake.
(2) filter stage increases H value, improve filtering speed, to enhance the handling capacity per unit time.
(3) reduce the H value washing stage, reducing filtration speed, so slow through the filter cake washing liquid, washing liquid to extend the residence time in the filter cake to reduce the consumption of washing liquid to obtain a good washing effect improve the efficiency of washing.
(4) drying stage to H maximum, maximum filter driver, was low with fluid filter cake.
(5) regeneration phase of the filter medium from the external to the siphon chamber fluid, fluid medium from the filtrate chamber flows through the filter cake inside the drum to achieve the reverse flushing filter media to filter performance filter media recovery.
Can see from the above, as compared with ordinary scraper centrifuge filter, siphon-type scraper discharging centrifuge can be adjusted siphon fluid outlet of the filter to adjust the speed without changing the drum speed, drum Moreover, changes speed is more difficult. Scraper with a siphon centrifuge to separate the chalk particle size of 20 m suspension test, the separation factor of 500, H0 = 47mm, when H = 0 (that is the same as ordinary scraper centrifuge, no siphon effect), this separation 3L kind of suspension requires 50s; when H = 38mm, the separation time of only 12s. Siphon Scraper Centrifuge Centrifuge Scraper compared with the ordinary, not only a higher capacity and better separation efficiency, and adaptability of materials, detachable medium containing particles or fine particles (0.01mm ~ 5mm) of the suspension, also detachable with short fibers (fiber length is less than 4mm) of the suspension, suspension concentration of 10% to 60%. Siphon scraper centrifuge suspension concentration or an amount of fluctuation is not sensitive to the continued operation of the process time can be adjusted; also on the cake for a good washing.
2 Conclusions
This new Centrifuge Scraper, whether for low or high temperature (subject to limitations of solid to liquid vapor pressure), work very stable. Especially suitable for washing and the need for adequate low solid content of the occasion. West is currently used to separate polypropylene clear, vitamin B, sodium bicarbonate, sodium perborate, calcium phosphate and other materials. Siphon scraper centrifuge with the development of modern industry in its series, the road is made of steady progress, substantial savings in foreign exchange for the country and also bring some economic benefits for the enterprise.
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