A method and arrangement for aseptically heating a liquid product in a heat exchanger unit of the heating zone of a UHT plant

摘要

A process for the aseptic heating of a liquid product (P) in a heat exchanger unit (22) of the heater zone of a UHT unit (20) according to the preamble of the dependent claims 1 or 2. It is an object of the present invention to provide a method of the generic type, a system for Implementation of the method and to provide a heat exchanger unit for this system, which reduce the product fouling in the product inlet of the heat exchanger unit adjacent areas and beyond in the treatment of liquid products, in particular temperature-sensitive food products of the type mentioned above, and thus the total Significantly increase the service life of the heat exchanger unit. This is achieved according to one embodiment of the method by the following method steps: (A1) setting of an unknown product-specific temperature profile ([TP (Ix)] PE-PA) between the product inlet temperature (TPE) and the product outlet temperature (TPA) with the aid of a supply of the required heating medium flow (FM) with the required heating medium inlet temperature (TME) at a heating medium inlet (EM) into the heating medium space (22.2) and measuring discrete product temperatures (TP, TP1 to TPn) predetermined measuring points (22.3 ) in the product stream (FP); (B1) Specifying the product inlet temperature (TPE) at a product inlet (EP) in the and the product outlet temperature (TPA) at a product outlet (AP) from the product space (22.1) and providing the heating medium inlet temperature ( TME) and the heating medium flow (FM); (C) measuring a product-specific temperature profile (TP (Ix)) between the product output (AP) and the product input (EP) at the predetermined measuring points (22.3); (D1) comparing the temperature profiles of the method steps (A1) and (C) and calculating the respective temperature deviations (± ΔTP) at the predetermined measuring points (22.3); (E) setting a permissible temperature deviation (± [ΔTP] o); (F) Changing the heating medium inlet temperature (TME) to a set heating medium inlet temperature (TME *) when the allowable temperature deviation (± [ΔTP] o) is exceeded by the calculated temperature deviation (± ΔTP).