摘要:
Methods and apparatus for freezing a product. The product is frozen in a treatment container which contains a vibrating support. The vibrating support is capable of receiving a film of a cryogenic liquid. A heated temperature probe, located just before the outlet of the treatment container, measures the temperature at that location. The supply system for the cryogenic liquid has a proportional valve. A data acquisition and processing unit receives the temperature information and controls the opening of the proportional valve.
摘要:
The invention relates to a flowmeter for two-phase gas/liquid cryogenic fluids, comprising: a liquid/gas phase separator, preferably consisting of a tank, into the top part of which the cryogenic liquid is admitted; a liquid flow-rate sensor, located in a liquid duct in fluid communication with the bottom part of the tank, the tank being placed in a high position in space relative to the liquid flow-rate sensor; a gas duct, in fluid communication with the top part of the tank equipped with the gas valve; and a device for measuring the level of liquid in the tank, preferably comprising two level sensors: a lower level sensor and an upper level sensor.
摘要:
The invention is a method for operating a cryogenic tunnel through which products to be chilled or deep-frozen pass. This tunnel is equipped with means for injecting a cryogenic fluid and means for extracting the cold gases in the tunnel. The method includes obtaining an entry or an exit gas temperature from a gas temperature probe outside the tunnel in proximity to the tunnel entrance or exit. The method also includes obtaining an ambient temperature from an ambient temperature probe located outside the tunnel. The method also includes determining a first delta which is the difference between the ambient temperature and the gas temperature. And the method includes controlling the extraction rate of the extraction means by feedback as a function of the the temperature difference between the first delta and a set point, in order to restore the value of the first delta to the setpoint value if necessary.
摘要:
According to the inventive method for the operation of a cryogenic tunnel (1) fitted with means (2) for injecting a cryogenic fluid and means for variable-rate extraction (3) of cold gases, at least one temperature probe (21,22) which is located outside the tunnel (1) close to the entrance and/or exit thereof and able to provide a value T (input/output) of the temperature of the gases and at least one second temperature probe (23) located outside the tunnel and able to provide a value T (amb) of the ambient temperature of the premises wherein the tunnel operates are provided and the difference T (amb input/output) is determined between the ambient temperature T (amb) and the temperature T (input/output) which is compared to a predetermined setpoint value To (amb-input/output) in order to act retroactively, according to the result of said comparison, on the rate of extraction of the extraction means (3) in order to establish, if necessary, the value of said temperature difference with regard to the setpoint value To (amb-input/output).
摘要翻译:根据用于操作装有用于注入低温流体的装置(2)和用于冷气体的可变速率提取(3)的装置的低温隧道(1)的本发明的方法,至少一个温度探头(21,22) 其位于隧道(1)外部,靠近其入口和/或出口,并且能够提供气体温度的值T(输入/输出)和位于隧道外部的至少一个第二温度探测器(23) 并且能够提供其中提供隧道操作的房屋的环境温度的值T(amb),并且在环境温度T(amb)和温度T(输入/输出)之间确定差值T(amb输入/输出) 输出),其与预定的设定值T o o o(amb-input / output)进行比较,以便根据所述比较的结果追溯地执行提取装置的提取速度( 3)为了在必要时建立所述温度的值 相对于设定值T o o o(/输入/输出)的差异。
摘要:
A method and device for chilling food products by jets blasted into a tunnel, said tunnel comprising/a conveyor for conveying products into a tunnel, at least one plate, located opposite the conveyor, and provided with through holes, the plate or plates being located above and/or below the conveyor; and at least one means of blowing a cold fluid through the through holes and towards the products, characterized in that, during all or part of the periods of operation of the tunnel and/or during all or part of the periods of stoppage of the tunnel, there takes place an operation to clear all or part of said through holes, using a network of channels allowing a blow gas to be distributed opposite all of said through holes.
摘要:
A method and installation using liquid CO2 as a cryogenic fluid for transferring cold energy to products, wherein liquid CO2 is sent into a heat exchanger system including first and second heat exchangers connected in series. The liquid CO2 is supplied to the first heat exchanger where it evaporates. Gaseous CO2 from the first exchanger is supplied to the second heat exchanger. The atmosphere surrounding the products is blown across the heat exchangers to provide a cooled atmosphere with which to cool the products. The latent heat of vaporization of the liquid CO2 in the first heat exchanger and the sensible heat of the gaseous CO2 in the second heat exchanger satisfies the cooling requirement of the products. The first exchanger is kept at a pressure higher than the triple point pressure for CO2, whereas the second exchanger is held at atmospheric pressure or at a pressure between the triple point of the fluid and atmospheric pressure.
摘要:
Methods and apparatus for freezing a product. The product is frozen in a treatment container which contains a vibrating support. The vibrating support is capable of receiving a film of a cryogenic liquid. A heated temperature probe, located just before the outlet of the treatment container, measures the temperature at that location. The supply system for the cryogenic liquid has a proportional valve. A data acquisition and processing unit receives the temperature information and controls the opening of the proportional valve.
摘要:
The invention relates to a device for freezing articles, that comprises a conveyor with a porous belt maintained in position inside the device by drums, and a means for impregnating the belt of said conveyor with a cryogenic liquid, wherein the impregnation of the belt is carried out by partially or totally immersing the belt in a bath of cryogenic liquid, characterised in that it comprises a means for pressing the belt of the conveyor onto one of said drums.