JP3455308B2 - 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 with a suction means such as a vacuum pump. Related to the device. In the chemical, food and medical product processes, 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 still 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. [0004] Therefore, a technical problem of the present invention is that when an object to be heated is liable to be damaged by heat, it can be heated by hot water having a relatively small amount of retained heat, and there is no risk of causing heat damage and uneven heating occurs. In the case where it is necessary to perform the heat treatment without heat, it is necessary to obtain a heating device using steam or hot water that can be heated with steam having a large amount of heat. [0005] In order to solve the above problems, the technical means of the present invention is to connect a heating fluid supply pipe to an inlet side of a heat exchanger and to provide an outlet of the heat exchanger. A suction means consisting of an ejector, a tank and a circulation pump is connected to the side, and an object to be heated is heated by a heating fluid with a heat exchanger. A steam pipe and a hot water pipe are connected to a heating fluid supply pipe through a valve means. Connecting the hot water heat exchanger to the hot water pipe, connecting the steam pipe to the hot water heat exchanger, and communicating with the suction means for maintaining the inside of the hot water heat exchanger in a reduced pressure state. A cooling water supply pipe for supplying cooling water to the tank is connected, and low-temperature cooling means for further cooling the cooling water in the tank or the cooling water supply pipe to a lower temperature is provided. 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 warm 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. [0007] The hot water pipe is connected to the hot water heat exchanger, and the steam pipe and the suction means are connected to the hot water heat exchanger, so that the steam is heat-exchanged in the hot water heat exchanger at a pressure lower than the atmospheric pressure. Hot water can be generated, and a large amount of hot water below 100 ° C. can be generated as needed. Therefore, the object to be heated can be heated with the relatively low temperature and a large amount of warm water. The provision of the low-temperature cooling means for further cooling the cooling water in the tank or the cooling water supply pipe of the suction means to a lower temperature allows the temperature of the fluid passing through the ejector of the suction means to be lower than the temperature of the normal cooling water. The temperature can be further reduced, and the degree of pressure reduction in the hot water heat exchanger can be increased to generate low-temperature hot water, thereby heating the object to be heated with low-temperature water. An embodiment showing a specific example of the above technical means will be described (see FIG. 1). In this embodiment, an example in which a reaction vessel 1 is used as a heat exchanger is shown. A heating fluid supply pipe 2 connected to an inlet side of the reaction vessel 1, a combination pump 3 as suction means connected to an outlet side, and hot water The heat exchanger 12 and the low-temperature cooling means 39 constitute a heating device using steam or hot water. [0010] 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 as valve means and a pressure regulating valve 7, and is connected 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 hot water heat exchanger 12 and a valve 13. The steam pipe 9 is branched to the hot water heat exchanger 12 and a steam pipe 15 for cold water heating is connected thereto. The lower end of the steam pipe 9 is connected to an ejector 20 of the combination pump 3 described below via a valve 33 and a pipe 34. At the same time, the steam trap 16 is attached to the lower end. Further, a temperature sensor 18 for detecting the temperature of the fluid in the pipe is attached to the heating fluid supply pipe 2. An ejector 20 of the combination pump 3 is connected to a lower portion of the jacket portion 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 and a thermometer for detecting the liquid level and the fluid temperature in the tank 23. A low-temperature cooling means 39 is arranged upstream of the cooling water supply pipe 27. The low-temperature cooling means 39 is provided in the vaporization tank 17.
, A vacuum pump 35, and valves 36 and 37 connected to the cooling water supply pipe 27. Cooling water is supplied from the cooling water supply pipe 27 into the vaporization tank 17 through the valve 36, and the inside of the vaporization tank 17 is evacuated by the vacuum pump 35, whereby the cooling water is vaporized and evaporated. Water is further cooled to a low temperature. The low-temperature cooling water is supplied to the cooling water supply pipe 27 or the tank 23 via the valve 37. 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 of 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 reaction vessel 1 and condensed to form 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. In this case, the inside of the hot water heat exchanger 12 is maintained at a reduced pressure below the atmospheric pressure by the ejector 20 of the combination pump 3, and the steam supplied from the valve 31 has a temperature of 100 ° C. or less inside the hot water heat exchanger 12. Temperature. Therefore, the cold water from the cold water pipe 14 is also supplied to the jacket section 4 as hot water of 100 ° C. or less. In this case, the temperature of the fluid in the tank 23 is lower than the temperature of the normal cooling water by the low-temperature cooling means 39, and the degree of pressure reduction in the hot water heat exchanger 12 is increased to increase the temperature of the hot water. Can be brought to a lower temperature state.
The hot water that has heated the reaction vessel 1 passes through the valve 22 to the ejector
Sucked in 20. 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 can be supplied to the jacket section 4 through the pipe 30 branched from the circulating passage 25, and the reactor 1 can be heated or cooled by the circulating fluid. Further, by supplying cooling water to the jacket portion 4 from the cooling water supply pipe 27 through the fluid supply port 29, the reaction vessel 1 can be cooled. In this case, the suction force of the combination pump 3 is increased to bring the inside of the jacket portion 4 into a vacuum state at the atmospheric pressure or lower, so that the reactor 1 is heated with steam at a pressure lower than the atmospheric pressure, that is, a temperature of 100 ° C. or lower. 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 is heated by the 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. Further, according to the present invention, the low-temperature cooling means allows the hot water heat exchanger to produce steam having a temperature of less than 100 ° C.
A large amount of hot water having a temperature of not more than C can be generated, and the object to be heated can be efficiently heated with hot water.

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 Reactor 2 Heated fluid supply pipe 3 Combination pump 4 Jacket section 7 Pressure regulating valve 9 Steam pipe 11 Hot water pipe 12 Hot water heat exchanger 14 Cold water pipe 17 Vaporization tank 20 Ejector 23 Tank 24 Circulation pump 35 Vacuum pump

Claims (1)

(57) [Claims 1] A heating fluid supply pipe is connected to the inlet side of the heat exchanger, and suction means including an ejector, a tank and a circulation pump is connected to the outlet side of the heat exchanger. Then, in the apparatus for heating the object to be heated by the heating fluid in the heat exchanger, the steam pipe and the hot water pipe are connected to the heating fluid supply pipe via valve means, and the hot water pipe is connected to the hot water heat exchanger. Connecting a steam pipe to the hot water heat exchanger, connecting a cooling water supply pipe for supplying cooling water to a tank of the suction means, communicating with suction means for maintaining the inside of the hot water heat exchanger in a reduced pressure state, A heating device using steam or hot water, further comprising low-temperature cooling means for further cooling the cooling water in the tank or the cooling water supply pipe to a low temperature.