How is the pasteurization process widely used in modern pasteurization processing?


Hofmann heat exchanger
There are many dense pipes in the milk production workshop! Some of these pipes are cold water, some are steam, and some milk, and milk is in the complex flow of the pipeline system!
Use a heat exchanger for heating.
A heat exchanger generally has two channels, one is for milk flowing, the other is for heating or cooling medium through. The heating or cooling medium is usually steam or cold water.
During the convection process of steam or cold water and milk, provide heat to milk, or take away the heat from the milk to achieve the purpose of heating or cooling.

There are many kinds of heat exchangers.
Plate Heat Exchanger

Tubular Heat Exchanger



Snake-like Heat Exchanger





                                                                                                                    
In this case, in the process of flowing through the heat exchanger the milk will be heated or cooled in the tube.
How long has milk been heated, how long has it been cooled back to the initial temperature?
In fact food engineers can calculate the initial temperature and flow of milk, by controlling the heating / cooling medium flow rate; you can control this information precisely!
Different pasteurization methods are corresponding to different temperatures and times. Ordinary pasteurization method is 62.8 degrees Celsius for 30 minutes; high temperature pasteurization method is 71.7 degrees for 15 seconds. (Of course there is an ultra-high temperature sterilization process of 138-150 degrees Celsius for 2-6 seconds, but it is not part of the discussion of pasteurization.)
By the way, milk processing is relatively high in the food processing of the development of automation technology. Now in many companies milking is even automation. As shown below: (so the milk processing in fact from the milk to the packaging are basically not need to manually operate ....)
                         


评论

发表评论

此博客中的热门博文

Safety Considerations for Plate Heat Exchanger Design

图片
Hofmann During the process, there are some safety considerations you should notice: 1. Design specifications. The design specifications of heat exchangers include the types of working fluid and flow, import and export temperature, working pressure and heat exchanger efficiency. Aerospace heat exchangers should also include permissible pressure drop, size and quality. 2. Overall arrangement. First you should choose the type and structure of heat exchangers, the form of fluid flow and the materials, and then choose the type of heat surface, to consider the operating temperature and pressure, etc. 3. Heat design. The thermal design of the heat exchanger includes heat transfer calculation, flow calculation and determination of size. In addition to technical performance indicators, thermal design also need heat transfer characteristics (including heat transfer characteristics, flow characteristics and structural parameters) and fluid and material thermal activity p
阅读全文

Optimization Design Method of Plate Heat Exchanger

图片
Plate Heat Exchanger 2.1 Improve heat transfer efficiency Plate heat exchanger is a wall-type heat transfer heat exchanger, hot and cold fluid are transferred through the heat exchanger plate, fluid and plates are directly in contact with each other, and the heat transfer mode is conduction and convective heat transfer. The key to improve the heat transfer efficiency is to improve the heat transfer coefficient and logarithmic mean temperature difference 。 1). Improving the heat transfer coefficient of the heat exchanger is at the same time to improve the heat and heat on both sides of the plate surface heat transfer coefficient, reduce the thermal resistance of the dirt layer, choose high thermal conductivity of the plate, reduce the thickness of the plate in order to effectively improve the heat transfer. a. Improve the surface heat transfer coefficient of the plate Since the ripple of the plate heat exchanger can make turbulence of the fluid at a small flow rate
阅读全文

The Features Of The Vertical Condenser And Shower-Type Condenser

图片
Vertical shell and tube condenser The main features of the vertical condenser are: 1)     Due to the high cooling flow and flow rate, the heat transfer coefficient is high, generally about K = 600 ~ 700 (kcal / m2? H? ℃ ). 2)     Vertical installation covers small areas, and can be installed outdoors. 3)     Cooling water flow directly and have high flow rate, so not need high water quality, the general water can be used as cooling water. 4)     Scales in pipe can be easy removed, and do not have to stop the refrigeration system work. 5)     But in the vertical condenser, the rise temperature of cooling water is generally only 2 ~ 4 ℃ , logarithmic average temperature difference is generally about 5 ~ 6 ℃ , so need much water. And because the equipment is placed in the air, the tube is susceptible to corrosion and is easier to find its leaking. Shower type condenser The main advantages of the shower-type condenser are: 1)     simple
阅读全文