JP2013081737A - Hydrothermal sterilization method of multieffect evaporator-type distilled water production system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydrothermal sterilization method for a multieffect evaporator-type distilled water production system, capable of normally producing distilled water as in the past, and sterilizing a feed-water wetted part within the system with hot liquid in sterilization, by providing a simple additive means.SOLUTION: The multieffect evaporator-type distilled water production system includes: a preheating means of feed water; a plurality of evaporators for successively generating pure steam from the preheated feed water; a steam-water separation means for the generated pure steam; a condenser which cools the pure water subjected to steam-water separation with feed water and cooling water to make distilled water; and an outside air introduction means connected to the condenser. The system further includes a hydrothermal sterilization circulating pipe branched from the middle of a pipe connecting a preheater to a first evaporator and returned to the base end of a feed water inlet pipe is provided, so that the feed-water wetted part can be hydrothermally sterilized using the feed water heated by the preheater.

Description

  The present invention relates to a hot water sterilization method for a multi-effect can-type distilled water production apparatus, and more specifically, a multi-effect can-type distilled water production apparatus composed of a plurality of bowl-shaped evaporators and their attached devices, and a hot water sterilization method thereof About. For example, various pharmaceutical manufacturing factories and medical sites require distilled water suitable for GMP (standards for manufacturing and quality control of pharmaceuticals and quasi-drugs) and the Japanese Pharmacopoeia. The present invention relates to an improvement in a hot water sterilization method of a multi-effect can-type distilled water production apparatus for producing such distilled water.

  Conventionally, as a multi-effect can type distilled water production apparatus as described above, supply water preheating means, a plurality of evaporators that sequentially generate pure steam from the preheated supply water, and steam generated by separating the generated pure steam And a condenser having pure water separated from the air and water cooled with supply water and cooling water to obtain distilled water, and an outside air introducing means connected to the condenser are known (see, for example, Patent Document 1).

  However, in such a conventional multi-effect can type distilled water production apparatus, not only is the piping very complicated, the production is troublesome and the operation is troublesome, but also the supply water inlet piping and the components to be constructed There is a problem in that contamination by microorganisms cannot be eliminated because there are places where the sterilization is insufficient in the wetted part of the feed water and there are places where the sterilization is not performed.

  Japanese Patent Laid-Open No. 60-051588

  The problem to be solved by the present invention is that by providing simple additional means, it is possible to produce distilled water as usual, and at the time of sterilization, a first water supply pipe and a first condenser including a condenser are provided. An object of the present invention is to provide a hot water sterilization method capable of sterilizing a supply water wetted part up to an evaporator supply water inlet with high temperature supply water.

  The present invention that solves the above-described problems is characterized in that feed water preheating means, a plurality of evaporators that sequentially generate pure steam from the preheated feed water, steam-water separation means for the generated pure steam, and steam separation. In a multi-effect can-type distilled water production apparatus comprising a condenser that cools pure steam with supply water and cooling water to form distilled water, and an outside air introduction means connected to the condenser, a hot water sterilization circulation pipe is provided to supply water The multi-effect can type distilled water production apparatus is characterized in that the water is returned to the supply water inlet pipe.

    Moreover, this invention is the hot water sterilization method of the multi-effect can type distilled water manufacturing apparatus which concerns on said this invention, Comprising: It branches from the middle of the piping which connects a preheater and a 1st evaporator, and supply water inlet piping is A hot water sterilization circulation pipe returning to the base end is provided, and the supply water heated by the preheater is replaced with the hot water sterilization circulation pipe, the original supply water inlet pipe, the supply water pump, the first condenser, the exhaust heat recovery device, and the preheat. A hot water sterilization method for a multi-effect can-type distilled water production apparatus, characterized in that the wetted part of the feed water is circulated in a vessel path and sterilized with hot water.

  The multi-effect can-type distilled water production apparatus according to the present invention (hereinafter simply referred to as the apparatus according to the present invention) is similar to the conventional multi-effect can-type distilled water production apparatus. A plurality of evaporators that sequentially generate pure steam, a steam-water separating means that separates the generated pure steam and water droplets, and a condenser that cools the steam-purified pure steam with supply water and cooling water to form distilled water And an outside air introducing means connected to the capacitor. As the steam-water separating means, a steam-water separator can be connected to the downstream side of each evaporator, and a steam-water separating mechanism can be provided in the lower chamber of each evaporator. The apparatus of the present invention is provided with a hot water sterilization circulation pipe which branches from the middle of the pipe connecting the preheater and the first evaporator and returns to the base end of the feed water inlet pipe, and the high temperature feed water is used as the original feed water. It circulates through the route of the inlet piping to sterilize the wetted part of the feed water with hot water.

  In the apparatus of the present invention, during the production of ordinary distilled water using this, the hot water sterilization circulation pipe is not functioned, and all the supplied water is supplied to the first evaporator after passing through the preheater. In addition, at the time of the hot water sterilization, all or a part of the supply water heated by the preheater is circulated to the supply water inlet pipe to sterilize the pipe with hot water.

  According to the present invention, usually by a simple additional means of adding a hot water sterilization circulation pipe branching from the middle of the pipe connecting the preheater and the first evaporator to the base end of the feed water inlet pipe, Distilled water can be produced as in the past, and at the time of hot water sterilization, including the supply water inlet pipe, condenser, exhaust heat recovery device, etc., to the base end of the first evaporator feed water inlet in the apparatus There is an effect that the supply water wetted part can be sterilized with high temperature supply water.

  The whole system diagram which illustrates the device of the present invention, and a hot-water sterilization means.

  The hot water sterilization method of the present invention will be described with reference to FIG. The apparatus of the present invention illustrated in FIG. 1 includes a first evaporator 70, a second evaporator 80, and a third evaporator 90, and a capacitor is connected to the downstream side of the third evaporator 90. Each lower chamber of the first evaporator 70, the second evaporator 80, and the third evaporator 90 has a built-in air / water separation mechanism (not shown), and the capacitor is connected to the first capacitor 30 and the downstream thereof. A distilled water outlet pipe 4 having a U-shaped pipe portion is connected to the downstream side of the second condenser 40. The feed water inlet pipe 1 is connected to the first condenser 30, and the cooling water inlet pipe 8 is connected to the second condenser 40. The first condenser 30 is connected to the upper chamber 70 </ b> A of the first evaporator 70 via the exhaust heat recovery device 50 and the preheater 60.

  The preheater 60 is a double tube plate type multi-tube cylindrical heat exchanger used when distilled water is produced or when the apparatus is sterilized with hot water. The preheater 60 is used for switching to the exhaust heat recovery unit 50 of the supply water inlet pipe 1. A temperature sensor 1G is disposed between the preheater 60 and the proportional control valve 1H. In order to maintain the supply water heated by the preheater 60 by the temperature sensor 1G during the steam sterilization operation of the apparatus at a set temperature (for example, 80 to 165 ° C.), the steam stop valve 2B of the heating steam inlet pipe 2 and the first evaporator The heater steam pipe 21 is branched from the steam inlet of 70, and an automatic on-off valve 21A and a proportional control valve 21B are provided here to supply the heating steam to the preheater 60, and the temperature sensor 1G. The amount of heating steam is adjusted by a proportional control valve 21B that is electrically linked to the control valve 21B. Steam generated in the preheater 60 is disposed between the steam drain nozzle of the preheater 60 and the nozzle of the exhaust heat recovery unit 50, with a steam trap 22A and a check valve 22B interposed therebetween. Drain is discharged from the steam drain outlet pipe 3.

  In the apparatus of the present invention illustrated in FIG. 1, a hot water circulation pipe 13 is provided. The hot water circulation pipe 13 branches from the supply water inlet pipe 1 between the proportional control valve 1H and the temperature sensor 1G, and is disposed so as to return to the base end portion of the supply water inlet pipe 1 via the check valve 14C. . The hot water circulation pipe 13 is provided with an automatic on-off valve 13B, a pressure sensor 13C, and a check valve 14C, and circulates high-temperature feed water by the feed water pump 1B of the feed water inlet pipe 1. . In order to prevent the high temperature feed water return pressure at the pressure sensor 13C from exceeding the pressure of the feed water source pipe 14 when circulating the high temperature feed water, a pressure sensor 14D is disposed in the feed water source pipe 14, The feed water pump 1B is inverter-controlled and the opening degree of the proportional control valve 1H is adjusted so that the feed water return pressure is always equal to or lower than the pressure of the feed water source pipe 14.

  In the apparatus of the present invention illustrated in FIG. 1, when hot water sterilization is performed on the pipe of the feed water inlet pipe 1 with high-temperature (usually 80 to 130 ° C.) feed water, the proportional control valve 1 H is closed and the automatic type Open the on-off valve 13B. Then, steam as a heating source is supplied to the heating chamber 60B of the preheater 60. The automatic on-off valve 14B of the feed water source pipe 14 is opened, and the feed water fed from the feed water inlet pipe 1 is a feed water pump 1B, a pressure sensor 1C, a flow meter 1D, an automatic on-off valve 1E, and a flow rate adjustment. Valve 1F, first condenser 30, exhaust heat recovery device 50, heat transfer tube of preheater 60, temperature sensor 1G, hot water sterilization circulation piping 13, automatic on-off valve 13B, pressure sensor 13C, check valve 14C and original supply A hot water sterilization circulation path composed of the water inlet pipe 1 is configured.

1 Supply Water Inlet Pipe 2 Heating Steam Inlet Pipe 3 Steam Drain Outlet Pipe 4 Distilled Water Outlet Pipe 5 Waste Distilled Water Outlet Pipe 6 Gas Outlet Pipe 7 Saturated Water Outlet Pipe 8 Cooling Water Inlet Pipe 9 Cooling Water Outlet Pipe 13 Hot Water Sterilization circulation pipe 14 Supply water source pipe 15 Outside air inlet pipe 30 First capacitor 40 Second capacitor 50 Waste heat recovery device 60 Preheater 70 First evaporator 80 Second evaporator 90 Third evaporator

Claims (1)

  Supply water preheating means, a plurality of evaporators that sequentially generate pure steam from the preheated supply water, steam generation means for separating the generated pure steam, and cooling the pure steam separated from the steam with supply water and cooling water In a multi-effect can-type distilled water production apparatus comprising a condenser for making distilled water and an outside air introducing means connected to the condenser, the feed water is heated by a preheater, and the preheater and the first evaporator are connected A hot water sterilization circulation pipe that branches off from the middle of the pipe to be returned to the base end of the supply water inlet pipe is provided, and the supply water wetted part is circulated through the supply water heated by the preheater to sterilize the supply water wetted part A hot water sterilization method for a multi-effect can-type distilled water production apparatus.

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