JPH0465286B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating system used for heating, concentrating, evaporating, etc. materials that are susceptible to thermal denaturation in fields such as the chemical industry, and particularly relates to a heating system for heating, concentrating, evaporating, etc. This invention relates to a novel heating medium supply mechanism that can continuously supply the heating medium while maintaining the same.

In general, enzymes, beer, etc. are susceptible to thermal denaturation and need to be heat-treated at relatively low temperatures, so a heating device is used that can process at low temperatures while supplying enough heat for evaporation in a short time.

The heat transfer part of this type of equipment is supplied with heat medium vapor such as Dowsum (trade name of diphenyl oxide).
This method performs uniform heating, and here, the temperature of the heat medium vapor is maintained at a constant temperature so that it does not rise above the temperature that changes the substance.
Steam must be supplied continuously and efficiently.

The present invention was made in response to such demands, and the heat transfer portion is kept in a reduced pressure state, and the heat medium vapor is continuously supplied while maintaining it at a constant low temperature. Specifically, in a heating system consisting of a heating medium steam generator and a heat transfer section that heats by condensation heat transfer of the medium vapor, the heat transfer section has an inlet for the heating medium vapor and an outlet for discharging the condensed liquid. The drain pipe that returns to the steam generator and the steam pressure adjustment pipe are connected respectively.The steam pressure adjustment pipe is connected to a pump via a cooling condenser, and the cooling condenser is connected to a cooling liquid flow control valve and a condensate liquid. A drain pipe is connected to return the liquid to the steam generator, and the internal pressure of the heating medium system is controlled to a steam pressure that corresponds to the required temperature of the heating surface.

Below, the present invention will be specifically explained based on the illustrated embodiment. In the figure, reference numeral 1 denotes a main body of a centrifugal thin film vacuum concentrator, and a motor (not shown) is installed inside the main body.
The heat transfer portion 3 has a rotor 2 that rotates by a rotor 2, and a heat transfer portion 3 having a bowl-shaped evaporation surface is formed on the rotor 2.
The heat transfer portion 3 is made to be airtight, and a heat medium is supplied thereto. In order to supply the heat medium to the heat transfer section 3, first, a steam supply pipe 4 is connected to the steam intake port 3' of the heat transfer section 3.
, and connect the steam generator 5 here.
The steam generator 5 is, for example, an airtight heat medium tank 6.
This is a so-called electric heating boiler with a heater 7 installed inside, and the heater 7 uses, for example, one 18kw and three 12kw, which can be switched freely. Further above, an evaporation chamber 8 is formed, from which a steam supply pipe 4 is connected.
is brought out. Further, a drain pipe 9 is pulled out from the heat transfer portion 3 and introduced into the liquid in the heat medium tank 6, and along with this, a vapor pressure adjustment pipe 1
0, and the pump 11 is connected thereto via the cooling condenser 16. The pump 11 is, for example, a water ring type pump capable of sucking a gas-liquid mixture. Also, pump 1
A heat medium storage tank 13 is connected to the second stage through a condenser for suction steam. The reference numeral 14 is an air supply pipe connected to the pump 11, and the reference numeral 15 is a heat medium supply pipe, each of which is connected to the air amount control valve 1.
4', and a heat medium amount control valve 15'. The cooling condenser 16 is, for example, a water pipe 16' arranged inside a container, and a drain pipe 17 leading from the liquid outlet of the cooling condenser 16 to the liquid in the heat medium tank 6.
It brings out the In addition, a pump (1 in the figure) may be installed in the drain pipe 9 and the drain pipe 17 as necessary.
8) can also be installed, thereby allowing the heat transfer liquid to be returned. A valve 19 is attached to the steam pressure adjusting pipe 10 between the pump 11 and the cooling condenser 16. In the figure, reference numeral 20 is a viewing window for observing the internal situation, 21 is a return pipe that returns the heating medium from the storage tank 13 to the heating medium tank 6, 22 is an atmosphere opening hole with a filter, and 23 is a safety valve. . Further, in order to maintain the temperature of the steam in the heat transfer section 3 constant, the vacuum level adjustment mechanism of the present invention specifically maintains the amount of heat of the heater 7 in the steam generator 5 constant, and adjusts the amount of cooling water in the cooling condenser 16. The degree of vacuum is controlled by condensation, and the water pipe 16' is adjusted while visually checking the thermometer 24 installed in the evaporation chamber 8.
In addition to manually operating the flow rate control valve 25, for example, a temperature sensor 26 is installed in the evaporation chamber 8 to detect the steam temperature, calculate based on the change in temperature and its rate of change, and output a constant control signal. It is also possible to change the opening degree of the electromagnetic flow control valve 25 of the water pipe 16' using an electric control device.
In addition, as another example, the cooling condenser 1
It is also possible to keep the amount of cooling water 6 constant and to control the amount of heat from the heater 7 in the same way as above. In yet another embodiment, the degree of vacuum is adjusted by the pump 11. That is, a vacuum gauge (or pressure sensor) 27 is provided in the steam pressure adjustment pipe 10, and the degree of vacuum is detected by this, and the valve 19 is operated while the pump 11 is operated manually or by an electric control device as described above. The opening degree is controlled, or the pump 11 is controlled to be activated when the degree of vacuum falls below a certain level.

The present invention has the configuration as described above, and supplies the heat medium under the following operation. That is, at the beginning of operation, the heater 7 of the steam generator 5 is energized to heat the heat medium to generate steam, and the pump 11 is operated to increase the heat transfer portion 3.
Inhale the steam inside. On the other hand, cooling condenser 1
Supply cooling water to 2 and 16. In such a case, the heat medium condensed by heat exchange in the heat transfer section 3 is returned to the heat medium tank 6 through the drain pipe 9, and excess steam is passed from the heat transfer section 3 through the steam pressure adjustment pipe 10. The liquid passes through the cooling condenser 16, where it is condensed and returned to the heat medium tank 6 through the drain pipe 17. At this time, the inside of the heat transfer part 3 is the pump 11.
This creates a reduced pressure state, which lowers the temperature of the steam. After the inside of the heat transfer section reaches a predetermined reduced pressure state, the pump 11 is stopped, the valve 19 is closed, and only the cooling condenser 16 continues to be supplied with cooling water. At that time, the steam is condensed in the cooling condenser 16, which maintains a reduced pressure, so that the steam can be circulated while being kept at a low temperature. Moreover, since the amount of cooling water in the water pipe 16' is controlled by the vacuum degree adjustment mechanism at this time, the temperature of the steam can be maintained at a constant temperature.

If the steam pressure increases further, the valve 19 is opened and the pump 11 is activated to increase the degree of vacuum again. Incidentally, when adjusting the degree of vacuum using a heater, the same operation as above can be performed. Also, adjust the vacuum level using pump 1.
1, the degree of vacuum is detected by a vacuum gauge (or pressure sensor) 27, and when the pressure rises above a certain level, the pump 11 is operated to reduce the pressure. In this case, of course, cooling water is supplied to the cooling condenser 16.

As described in detail above, the present invention heats a heat medium to generate steam, and when performing heat exchange in the heat transfer section, the pressure inside the heat transfer section is reduced by a pump, and in this state, the vacuum level adjustment mechanism is used to generate steam. The steam is circulated while controlling the temperature at a constant level, thereby supplying a large amount of low-temperature steam and increasing the amount of heat transferred per unit time on the heat transfer surface. This allows stable and efficient heating of substances that are susceptible to thermal denaturation. Further, the present invention exhibits the following effects. That is, the amount of the material to be treated that is supplied to the heat transfer surface varies, and therefore the amount of steam required for heating also varies.

In contrast, in the apparatus of the present invention, the heat amount of the heater is kept constant to generate enough steam to match the fluctuations in the material to be treated, and the excess steam after heat exchange is condensed in a cooling condenser and returned to the heat medium tank. By always supplying enough steam for heating,
This enables stable heating.

[Brief explanation of the drawing]

The figure is a flow sheet diagram showing an example of a heat medium supply mechanism in a heating system according to the present invention. 1...Main body, 2...Rotor, 3...Heat transfer part, 4...Steam supply pipe, 5...Steam generator,
6... Heat medium tank, 7... Heater, 8... Evaporation chamber, 9... Drain pipe, 10... Steam pressure adjustment pipe, 11... Pump, 12... Condenser for suction vapor, 13... Heating Media storage tank, 16...
Cooling condenser, 17... Drain pipe, 16'
...Water pipe, 18...Pump, 19...Valve, 24...
...Thermometer, 25...Flow rate control valve, 26...Temperature sensor, 27...Vacuum gauge.

Claims (1)

[Scope of Claims] 1. A heating system consisting of a heating medium steam generator and a heat transfer section that heats by condensation heat transfer of the medium vapor, the heat transfer section having a heating medium vapor intake port and a condensate liquid inlet. A drain pipe for discharging the gas and returning it to the steam generator is connected to a pipe for regulating steam pressure. A pump is connected to the pipe for regulating steam pressure via a cooling condenser. A cooling liquid flow control valve and a condensate are connected to the cooling condenser. A heating medium supply mechanism in a heating system, characterized in that the internal pressure of the heating medium system is controlled to a steam pressure corresponding to the required temperature of a heat transfer section by connecting a drain pipe that returns to a steam generator.