JP3507841B2 - Steam or hot water heating device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to heating with steam or hot water for heat-treating an object to be heated while sucking the inside of a heat exchanger by a suction means such as a vacuum pump. Equipment related. In chemical, food, and medical product factories, there are many applications where the object to be heated must be heated at a relatively low temperature of about 100 ° C in order to maintain product quality. Heating has been performed using low-pressure steam having a large amount of heat. 2. Description of the Related Art An example of conventional low-temperature steam heating is disclosed, for example, in Japanese Patent Publication No. 5-81298. This is a device in which a steam supply pipe and a vacuum pump are connected to a heat exchanger, and a porous member is provided in contact with an outer wall of the heat exchanger or through a small gap, and is supplied to the heat exchanger. The heating steam is hindered by the porous member and the amount of supplied heat is suppressed, so that heat damage to the object to be heated can be prevented. [0003] In the case of the above-mentioned prior art, the amount of supplied steam is limited by the porous member, but the amount of supplied steam is excessive and the object to be heated is thermally damaged. was there. This is caused by fluctuations in the amount of the object to be heated and fluctuations in the pressure and temperature of the heated steam. That is, since the amount of heat held by the steam is relatively large, the object to be heated is likely to cause thermal damage. Accordingly, a technical problem of the present invention is that when an object to be heated is apt to cause thermal damage, it can be heated with hot water having a relatively small amount of heat, and there is no risk of thermal damage and uneven heating occurs. In the case where it is necessary to perform heat treatment without heat, a heating device using steam or hot water that can be heated with steam having a large amount of heat is to be obtained. [0005] The technical means of the present invention taken to solve the above problems is to connect a heating fluid supply pipe to the inlet side of the heat exchanger and to connect the outlet of the heat exchanger. A suction means is connected to the side, and the object to be heated is heated by a heating fluid with a heat exchanger. In the heating fluid supply pipe, a steam pipe and a hot water pipe are connected via a valve means, and a heat pipe is connected to the hot water pipe. Exchanger
Connected to the heat exchanger and diverted a steam pipe to the cold water heater.
It is characterized by connecting a pipe . By connecting the steam pipe and the hot water pipe to the heating fluid supply pipe via the valve means, the valve means can be operated to switch and supply steam and hot water respectively when necessary.
In the case of hot water, thermal damage to the object to be heated can be prevented, and in the case of steam, the object to be heated can be heated with a large amount of heat without uneven heating. An embodiment showing a specific example of the above technical means will be described (see FIG. 1). In the present embodiment, an example in which a reaction vessel 1 is used as a heat exchanger is shown, and steam is supplied by a heating fluid supply pipe 2 connected to the inlet side of the reaction vessel 1 and a combined pump 3 connected to an outlet side as suction means. Alternatively, a heating device using hot water is configured. A jacket portion 4 is attached to the outer periphery of the reaction vessel 1, and a heating fluid supply port 5 is provided at an upper end thereof, and a heating fluid supply pipe 2 is connected. The heating fluid supply pipe 2 is connected to a steam pipe 9 via valves 6 and 8 serving as valve means and a pressure regulating valve 7, and to a hot water pipe 11 via a valve 10. The hot water pipe 11 is further connected to a cold water pipe 14 via a heat exchanger 12 and a valve 13. The steam pipe 9 is branched to the heat exchanger 12, and a cold water heating pipe 15 is connected to the heat exchanger 12, and a steam trap 16 is attached to a lower end thereof. An air communication pipe 17 is attached to the upper part of the heat exchanger 12. Heating fluid supply pipe 2
A temperature sensor 18 for detecting the temperature inside the tube is installed inside. An ejector 20 of the combination pump 3 is connected to a lower portion of the jacket 4 via a pipe 19. Between the pipe line 19 and the ejector 20, a steam trap 21 and a valve 22 are arranged in parallel. Combination pump 3
Ejector 20, tank 23, circulation pump 24, and
It comprises a circulation path 25 that communicates with each other. Tank 2
3, a cooling water supply pipe 2 through a cooling water control valve 26.
7 is communicated. A branch passage 28 is provided from the circulation passage 25 to serve as a surplus fluid discharge passage in the tank 23. In this case, although not shown, it is preferable to attach a liquid level gauge or a thermometer for detecting the liquid level and the fluid temperature in the tank 23. [0010] The cooling water supply pipe 27 is branched and connected to one fluid supply port 29 of the jacket portion 4. Further, a part of the circulation path 25 of the combination pump 3 is also branched and connected to the heating fluid supply port 5 of the jacket section 4 via the pipe 30. Next, the operation will be described. When heating the reactor 1 with steam, the circulation pump 24 of the combination pump 3 is driven, and the valves 6 and 8 are opened to open the valves 10 and 3.
The valves 1 and 32 are closed, and steam at a predetermined pressure, that is, temperature is supplied from the pressure regulating valve 7 to the jacket section 4 through the heating fluid supply port 5. The supplied steam is deprived of heat by the object to be heated in the reactor 1 and condensed to form a drain. Drain is steel
Ejector 20 through the air trap 21 or valve 22
Is sucked. The sucked drain reaches the tank 23,
It is sucked by the circulation pump 24 and circulates in the circulation path 25. In the ejector 20, the pressure is reduced to a saturation pressure corresponding to the temperature of the circulating fluid, and the drain generated in the jacket 4 is sucked. The temperature of the fluid in the tank 23 can be controlled to a desired temperature by controlling the cooling water control valve 26 in accordance with a value detected by a thermometer (not shown), and the suction force of the ejector 20 can be adjusted. . If the amount of heat is too large to heat the reactor 1 with steam and the object to be heated may be damaged, the valve 8 is closed and the valves 10, 13, 31 are opened. By heating the cold water from the cold water pipe 14 to a desired temperature and supplying hot water from the heating fluid supply pipe 2 to the jacket section 4, the reactor 1 can be heated without causing thermal damage. Also in this case, the hot water heated in the reaction vessel 1 is sucked into the ejector 20 through the valve 22. The temperature of the hot water can be arbitrarily adjusted by detecting the temperature with the temperature sensor 18 and controlling the opening of the valves 13, 31 or the pressure regulating valve 7. In the present embodiment, the circulating fluid is supplied to the jacket section 4 through the pipe 30 branched from the circulation path 25, so that the reactor 1 can be heated or cooled at a lower temperature. Further, the cooling water supply pipe 27 is connected to the fluid supply port 29.
By supplying cooling water to the jacket part 4 through
The reactor 1 can be cooled. In this case, the suction force of the combination pump 3 is increased to make the inside of the jacket portion 4 a vacuum state at or below atmospheric pressure, thereby heating the reactor 1 with steam at a pressure of at most atmospheric pressure, that is, at a temperature of 100 ° C. or less. You can also. As described above, according to the present invention, since the steam pipe and the hot water pipe are connected to the heating fluid supply pipe, the object to be heated can be heated by hot water having a relatively small amount of retained heat. Heat damage can be prevented, and the object to be heated can be heated in a short time without heating unevenness by heating with steam having a large amount of retained heat.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram of a heating device using steam or hot water of the present invention. [Description of Signs] 1 Reaction vessel 2 Heated fluid supply pipe 3 Combination pump 4 Jacket section 7 Pressure regulating valve 9 Steam pipe 11 Hot water pipe 12 Heat exchanger 14 Cold water pipe 20 Ejector 23 Tank 24 Circulation pump 27 Cooling water supply pipe

Claims (1)

(57) [Claims 1] A heating fluid supply pipe is connected to the inlet side of the heat exchanger, and a suction means is connected to the outlet side of the heat exchanger. In what heats an object to be heated,
Connect the steam pipe and hot water pipe to the heating fluid supply pipe via valve means
At the same time, connect a heat exchanger to the
A heating device using steam or hot water, wherein a cold water heating tube having a branched steam tube is connected to the exchanger .