The Coperion Bulk-X-Change heat exchanger is highly efficient, compact and low cost. Another magnetic flow meter based system with an AC variable frequency motor control drive on a centrifugal pump is also possible in lieu of a positive displacement metering pump on a HTST pasteurizer. This information might be about your preferences or your device and is mostly used to make the site work as you expect it to. It is essentially a 3-way valve, which, at temperatures greater than 72° C,opens to forward flow. other time temperature combinations must be approved (e.g. 63° C for not less than 30 min., Thermal lethality determinations require the applications of microbiology to appropriate processing determinations. Due to the differences in Z values, it is apparent that at higher temperatures for shorter times, a region exists (shaded area) where pathogens can be destroyed while vitamins can be maintained. If they are not, how would this affect the efficiency of the pasteurization process? If the number of microorganisms in the food increases, the heating time required to process the product will also be increased to bring the population down to an acceptable level. Reactions that have small Z values are highly temperature dependent, whereas those with large Z values require larger changes in temperature to reduce the time. When fluids move through a pipe, either of two distinct types of flow can be observed. The Coperion heat exchanger is a proven technology. The chapters on surface treatments are limited to surface hardening by structural modiﬁcation of a surface layer. and Jisc. The description of the experiment cooling bulk batches in different conditions is given. Several parameters help us to do thermal calculations and define the rate of thermal lethality. dual stem - consists of 2 valves in series for additional fail safe systems. 66° C/30 min, 75° C/16 sec. Each piece of HTST equipment will be discussed in further detail later. This concept is also attractive for retrofitted systems, as it can be installed during the ongoing production process at variable locations. The same holds true for other quality factors such as colour and flavour components. Request. They help us to know which pages are the most and least popular and see how visitors move around the site. It ensures that nothing downstream is creating suction on the pasteurized side. The process is dependent both on the temperature of exposure and the time required at this temperature to accomplish to desired rate of destruction. The vat pasteurizer is used extensively in the ice cream industry as it allows for dissolution and blending of ingredients during the heating stage. By keeping the pasteurized milk at least 1 psi higher than raw milk in regenerator, it prevents contamination of pasteurized milk with raw milk in event that a pin-hole leak develops in thin stainless steel plates. Its efficiency may be calculated as follows: % regeneration = temp. Bulk-X-Change InlineThis concept was especially for fine powders.The principle of this patented product, is the direct installation of the Bulk-X-Change in a vertical pneumatic covneying line. The second type is streamline, or laminar flow which occurs at low velocities and shows no eddy currents. By clicking “Accept All Cookies,” you agree to the storing of cookies on your device. The raw milk, still under suction, passes through a positive displacement timing pump which delivers it under positive pressure through the rest of the HTST system. The homogenizer may be used as timing pump. Also called the flow diversion valve (FDV), it is located at the downstream end of the upward sloping holding tube. To ensure destruction of all pathogenic microorganisms, time and temperature combinations of the pasteurization process are highly regulated: Milk: Spheroidizing is a form of heat treatment for iron-based alloys, commonly carbon steels, in order to convert them into ductile and machinable alloys. Thus in UHT milk processing, very high temperatures for very short times (e.g., 140oC for 1-2 s) are favoured compared to a lower temperature longer time processes since it results in bacterial spore elimination with a lower loss of vitamins and better sensory quality. The STLR records the temperature of the milk and the time of day. The pneumatically conveyed powder is fed into the vertically positioned heat exchanger from below with the conveying gas. Never miss out on the latest industry developments and our news. Thus the results found with water are converted to the milk flow time by formulation since a pump may not deliver the same amount of milk as it does water. Since the magnetic flow meter continuously senses flow rate, it will signal the electronic controller if the actual flow exceeds the set flow rate for any reason. It is centrifugal "stuffing" pump which supplies raw milk to the raw regenerator for the balance tank. A Z value of 10°C is typical for a spore forming bacterium. For example: Cold milk entering system at 4° C, after regeneration at 65° C, and final temperature of 72° C would have an 89.7% regeneration: The timing pump draws product through the raw regenerator and pushes milk under pressure through pasteurized regenerator. The bulk material flows from top to bottom due to gravitational forces through the vertical tubes which are surrounded by a heating or cooling medium on the shell side. At the pasteurized product discharge is a vacuum breaker which breaks to atmospheric pressure. If the flow rate is exceeded for any reason, the flow diversion device is put into diverted flow. The information does not usually directly identify you, but it can give you a more personalized web experience. Have a look at our job vacancies. It is a positive pressure pump; if not, then it cannot supplement flow. The balance tank also prevents air from entering the pasteurizer by placing the top of the outlet pipe lower than the lowest point in the tank and creating downward slopes of at least 2%. creams, chocolate) and special batches. The heat treatment is accomplished using a plate heat exchanger.
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