JPH0926103A - Vacuum steam heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum seam heating device which is capable of securing the amount of revaporizing steam, even when the amount of hot drain is minimized. SOLUTION: A hot drain flowing-in pipe 5 is connected to a vaporizer vessel 1. A communication pipe 9 is mounted so as to communicate the upper part of the vaporizing vessel 1 with the lower part of the vessel 1. A steam trap 11 is mounted on an elevation slightly higher than the central part of the communication pipe 9 by way of a pipe 10. The output side of the steam trap 11 is connected to an ejector 20 of an ejector type vacuum pump 3. The vaporizer vessel 1 and a vacuum steam heater 2 are connected with a vacuum steam pipe 6.

Description

Detailed Description of the Invention

[0001]

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 low temperature steam of 100 ° C. or lower. Specifically, it is used for steam heating of a reaction kettle used for various chemical reactions, a device for distilling and concentrating food, or a sterilizer for medical products.

[0002]

2. Description of the Related Art As a conventional vacuum steam heating device, for example, one disclosed in Japanese Patent Laid-Open No. 4-48102 has been used. This is the vacuum vapor generated by the re-evaporation of the warm waste water by connecting the vaporization container into which the warm waste water flows and re-evaporates, the re-evaporation vapor outlet of the evaporation container and the decompression means via the vacuum steam heater. Is used in a heater, and it is possible to effectively reuse a large amount of warm waste water that was conventionally discarded.

[0003]

In the above-mentioned conventional vacuum steam heating apparatus, when the amount of hot waste water flowing in is small, the amount of steam for re-evaporation becomes small and sufficient heating can be performed by the vacuum steam heater. There was a problem that disappeared. This is because the hot drainage is directly sucked by the vacuum pump from the evaporation container, so the inflowing warm drainage is immediately sucked by the vacuum pump, and the hot drainage at the upper part of the evaporation container, which is easy to re-evaporate, has priority. This is because the amount of re-evaporated vapor is reduced.

Therefore, a technical object of the present invention is to obtain a vacuum vapor heating device capable of generating a sufficient amount of re-evaporated vapor even when the amount of warm waste water flowing into the vaporization container is small. That is.

[0005]

The structure of the vacuum steam heating apparatus of the present invention is as follows. An evaporation container in which warm waste water flows in and is re-evaporated, and a re-evaporation steam outlet of the evaporation container and a decompression means are connected via a vacuum steam heater, and a communication pipe for communicating the upper and lower parts of the evaporation container is provided. The steam trap is attached, a steam trap is arranged on the communicating pipe, and the outlet side of the steam trap is connected to a pressure reducing means.

[0006]

The vapor re-evaporated in the evaporation container is sucked by the pressure reducing means through the vacuum vapor heater, so that the object to be heated is vapor-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 by the low temperature steam at 100 ° C. or lower. Condensed water of vacuum vapor, which is condensed by heating the object to be heated, that is, condensate, is sucked by the decompression means and is discharged to the outside of the system.

The steam trap is a kind of automatic valve that discharges liquid, that is, warm waste water to the outlet side, but does not discharge gas, that is, re-evaporated vapor. By attaching a communication pipe that connects the upper and lower parts of the evaporation container and arranging a steam trap on this communication pipe, the warm wastewater that has flowed into the evaporation container is sucked into the decompression means through the steam trap. Therefore, by appropriately selecting the position of the steam trap, it is possible to secure the required amount of warm wastewater in the evaporation container, and the warm wastewater sucked into the decompression means via the steam trap is given priority from the bottom of the evaporation container. The relatively high temperature warm waste water stays in the upper part because it is aspirated, so that more re-evaporated vapor can be generated.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. An evaporation container 1 connected to the warm waste water inflow pipe 5, a vacuum steam heater 2, and a vacuum steam pipe 6 connecting the evaporation container 1 and the vacuum steam heater 2 to each other.
And the depressurizing means 3 to which the lower end of the vacuum steam pipe 6 is connected constitute a vacuum steam heating device.

A warm waste water inflow pipe 5 is connected to the evaporation container 1 via a valve 7. A vacuum vapor pipe 6 is connected to the re-evaporation vapor outlet 8 of the evaporation container 1. A communication pipe 9 which connects the upper part and the lower part of the evaporation container 1 is attached, and a steam trap 11 is arranged above the communication pipe 9 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 warm waste water to the outlet side but does not discharge re-evaporated steam.

The vacuum steam pipe 6 is connected to the vacuum steam heater 2 through a pressure adjusting valve 15, and the lower end portion thereof is connected to the pressure reducing means 3. An object-to-be-heated supply pipe 16 and an object-to-be-heated take-out pipe 17 are connected to the vacuum steam heater 2.

The depressurizing means 3 is composed of an ejector-type vacuum pump including an ejector 20 having a nozzle built therein, a tank 21, a circulation pump 22, and a circulation path 23 connecting them. 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 decompression means uses the circulation pump 2 for circulating the fluid in the tank 21, that is, water.
The suction force is generated in the ejector 20 by circulating it in 2 and passing it to the nozzle part in the ejector 20. A surplus water discharge passage 26 is connected via a valve 25 to a circulation passage 23 connected to the discharge port of the circulation pump 22. Tank 2
A cooling water supply pipe 27 is connected to the upper part of 1 via a cooling water control valve 28.

Next, the operation will be described. Bypass valve 13
Valve is opened, and the ejector-type vacuum pump 3 is driven to generate a suction force by the ejector 20.
Also, the inside of the vacuum steam pipe 6 is brought to a predetermined vacuum state. The bypass valve 13 is closed when a predetermined vacuum state is reached. The valve 7 is opened to allow the warm waste water to flow from the warm waste water inflow pipe 5 into the evaporation container 1. The warm waste water in the evaporation container 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 adjusting valve 15, and the object to be heated therein is heated by the low-temperature vacuum steam. . The steam that has heated the object to be heated is condensed and becomes condensed water, which is sucked into the ejector 20 of the ejector-type vacuum pump 3 and reaches the tank 21.

Among the warm waste water accumulated in the evaporation container 1, the warm waste water at the upper surface re-evaporates, but the lower warm waste water passes through the communication pipe 9 and is sucked from the steam trap 11 to the ejector 20. Therefore, even if the amount of the warm wastewater flowing down from the warm wastewater inflow pipe 5 is small and the temperature difference of the warm wastewater is generated in the upper and lower parts of the evaporation container 1, the temperature of the lower part from the steam trap 11 is reduced. The low temperature warm wastewater is preferentially discharged, and the amount of re-evaporated vapor in the evaporation container 1 can be secured.

[0014]

According to the present invention, the warm waste water is sucked by the suction means through the steam trap, and at the same time, the relatively low temperature warm waste water in the lower portion of the evaporation container is preferentially sucked.
Even when the amount of warm waste water flowing into the evaporation container is small, more re-evaporated steam can be secured and sufficient heating can be performed with the vacuum steam heater.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a vacuum steam heating device of the present invention.

[Explanation of symbols]

 1 Evaporation Container 2 Vacuum Steam Heater 3 Decompression Means 5 Warm Waste Water Inflow 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)

[Claims] 1. An evaporation container in which warm waste water flows in and is re-evaporated, a re-evaporation vapor outlet of the evaporation container and a decompression means are connected via a vacuum steam heater, and the upper and lower parts of the evaporation container are A vacuum vapor heating device, characterized in that a communicating pipe is attached to the communicating pipe, a steam trap is arranged on the communicating pipe, and an outlet side of the steam trap is connected to a pressure reducing means.