JP3510010B2 - Vacuum steam heating device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum steam heating apparatus suitable for heating an object to be heated with a low-temperature steam of about 100 ° C. or less. Specifically, it is used for steam heating in a reaction pot used for various chemical reactions, a distilling device for food, a concentrating device, or a sterilizing device for medical products. 2. Description of the Related Art As a conventional vacuum steam heating device, for example, a device disclosed in Japanese Patent Application Laid-Open No. 4-48102 has been used. This is because the evaporating vessel into which the hot waste water flows in and re-evaporates, the re-evaporating steam outlet of the evaporating vessel and the pressure reducing means are connected via a vacuum steam heater, and the vacuum steam generated by the re-evaporation of the hot waste water is connected. Is used in a heater, and a large amount of hot wastewater that has been conventionally discarded can be effectively reused. [0003] In the above-mentioned conventional vacuum steam heating apparatus, when the amount of hot water discharged is small, the amount of steam for re-evaporation is small, and the vacuum steam heater is sufficient. There was a problem that heating could not be performed. This is because the hot drainage is directly sucked into the vacuum pump because the hot drainage is sucked directly from the evaporation container by the vacuum pump, and the relatively high temperature hot drainage at the top of the evaporation container that is easy to re-evaporate has priority. This is due to the fact that it is sucked in tentatively and the amount of re-evaporated steam is reduced. Accordingly, a technical problem of the present invention is to provide a vacuum steam heating device capable of generating a sufficient amount of re-evaporated steam even when the amount of hot waste water flowing into an evaporation vessel is small. That is. [0005] The structure of the vacuum steam heating apparatus of the present invention is as follows. An evaporating vessel into which hot waste water flows in and re-evaporated, and a communication pipe connecting the upper and lower portions of the evaporating vessel with a re-evaporating steam outlet of the evaporating vessel and a pressure reducing means connected via a vacuum steam heater. A steam trap is mounted on the communication pipe, and the outlet side of the steam trap is connected to a pressure reducing means. The vapor re-evaporated in the evaporating vessel is sucked by the pressure reducing means through the vacuum vapor heater, so that the object to be heated is heated by the heater. Since the vacuum steam heater is connected to the pressure reducing means, the inside of the vacuum steam heater is in a vacuum state at atmospheric pressure or lower, and the object to be heated can be heated with low-temperature steam at 100 ° C. or lower. The condensed water of the vacuum vapor condensed by heating the object to be heated, that is, condensed water, is sucked by the decompression means and discharged to the outside of the system. [0007] A steam trap is a type of automatic valve that discharges liquid, that is, hot waste water, to the outlet side, but does not discharge gas, that is, re-evaporated steam. By installing a communication pipe that communicates the upper and lower parts of the evaporation vessel, and arranging a steam trap on this communication pipe, the hot waste water that has flowed into the evaporation vessel is sucked into the pressure reducing means via the steam trap. Therefore, by appropriately selecting the position of the steam trap, it is possible to secure the necessary amount of hot waste water in the evaporating vessel, and the hot waste water sucked into the pressure reducing means via the steam trap is given priority from the bottom of the evaporating vessel. As a result, the relatively high-temperature hot waste water stays in the upper portion, so that more reevaporated steam can be generated. An embodiment shown in the drawings will be described in detail. An evaporating vessel 1 connected to the warm drainage inflow pipe 5, a vacuum steam heater 2, and a vacuum steam pipe 6 for communicating the evaporating vessel 1 with the vacuum steam heater 2.
And the pressure reducing means 3 connected to the lower end of the vacuum steam pipe 6 constitute a vacuum steam heating device. A hot waste water inflow pipe 5 is connected to the evaporating vessel 1 via a valve 7. A vacuum steam pipe 6 is connected to a re-evaporation steam outlet 8 of the evaporation vessel 1. A communication pipe 9 that connects the upper part and the lower part of the evaporating vessel 1 is attached, and a steam trap 11 is disposed above the evaporating vessel 1 via a pipe 10. The outlet side of the steam trap 11 is connected to the pressure reducing means 3 by a pipe 12. A bypass valve 13 is attached in parallel with the steam trap 11. The steam trap 11 is a type of automatic valve that discharges hot waste water to the outlet side but does not discharge reevaporation steam. [0010] The vacuum steam pipe 6 is connected to the vacuum steam heater 2 via a pressure regulating valve 15, and the lower end thereof is connected to the pressure reducing means 3. The heated object supply pipe 16 and the heated object removal pipe 17 are connected to the vacuum steam heater 2. The pressure reducing means 3 comprises an ejector-type vacuum pump comprising an ejector 20 having a built-in nozzle, a tank 21, a circulation pump 22, and a circulation path 23 connecting these. The lower part of the tank 21 is connected to the suction port side of the circulation pump 22 and the discharge port side of the circulation pump 22 is connected to the ejector 2.
Connect to 0. The ejector-type vacuum pump 3 as a pressure reducing means circulates the fluid in the tank 21, that is, water, etc.
The suction force is generated in the ejector 20 by circulating in the nozzle 2 and passing through the nozzle portion in the ejector 20. A surplus water discharge passage 26 is connected via a valve 25 to a circulation passage 23 connected to a discharge port of the circulation pump 22. Tank 2
A cooling water supply pipe 27 is connected to the upper part of the cooling water supply pipe 1 via a cooling water control valve 28. Next, the operation will be described. Bypass valve 13
Is opened, and the ejector-type vacuum pump 3 is driven to generate a suction force by the ejector 20.
Then, the inside of the vacuum steam pipe 6 is brought into a predetermined vacuum state. When a predetermined vacuum state is reached, the bypass valve 13 is closed. The valve 7 is opened, and the hot waste water flows down from the hot waste water inflow pipe 5 into the evaporation vessel 1. The hot wastewater in the evaporation vessel 1 is re-evaporated, and the re-evaporated steam is supplied from the vacuum steam pipe 6 to the vacuum heater 2 via the pressure regulating valve 15 to heat the object to be heated with low-temperature vacuum steam. . The steam that has heated the object to be heated is condensed and condensed to be condensed, and is sucked by the ejector 20 of the ejector type vacuum pump 3 to reach the tank 21. [0013] Of the hot waste water stored in the evaporating vessel 1, the hot waste water on the upper surface is re-evaporated, but the hot waste water on the lower part is sucked from the steam trap 11 to the ejector 20 through the communication pipe 9. Therefore, even if the amount of hot waste water flowing down from the hot waste water inflow pipe 5 is small and a difference in temperature of the hot waste water occurs between the upper and lower portions in the evaporating vessel 1, the lower portion of the steam trap 11 can be used. Low-temperature hot wastewater is preferentially discharged, and the amount of re-evaporated steam in the evaporation container 1 can be secured. According to the present invention, the hot waste water is sucked by the suction means through the steam trap, and the relatively low-temperature hot waste water at the lower part of the evaporator is preferentially sucked.
Even when the amount of hot wastewater flowing into the evaporation container is small, more re-evaporated steam can be secured, and sufficient heating can be performed by the vacuum steam heater.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram showing an embodiment of a vacuum steam heating device of the present invention. [Description of Signs] 1 Evaporation vessel 2 Vacuum steam heater 3 Decompression means 5 Hot drainage inlet pipe 6 Vacuum steam pipe 8 Re-evaporation steam outlet 9 Communication pipe 11 Steam trap 20 Ejector 21 Tank 22 Circulation pump

Claims (1)

(57) [Claims 1] An evaporating vessel into which hot waste water flows and re-evaporates, and a re-evaporating steam outlet of the evaporating vessel and a pressure reducing means are connected via a vacuum steam heater. Vacuum steam heating, characterized in that a communication pipe connecting the upper and lower portions of the evaporation vessel is attached, a steam trap is arranged on the communication pipe, and an outlet side of the steam trap is connected to a pressure reducing means. apparatus.