JPH0368283B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat recovery method and apparatus, and more particularly to a heat recovery method and apparatus convenient for recovering heat from high-temperature deodorized fats and oils by heat exchange with soft water fed by gravity. Regarding.

The deodorizing process of fats and oils is generally carried out in a vacuum deodorizing tower in order to enhance the treatment effect. The raw material oil fed into this deodorizing tower is usually at a temperature of about 40 to 80°C.
This raw material oil to be treated is first stirred and heated to about 170 to 180°C in a steam heating tray in this column, and then stirred and heated to about 230 to 270°C in the next heating tray. After that, several stages of stirring and deodorization are performed, and then the tower is cooled down to approximately 60° to 70°C with cooling water.
After low-temperature deodorization treatment, it is taken out of the vacuum deodorization tower as a product oil.

In this method, raw oil at 40 to 80 degrees Celsius must be heated to about 230 degrees Celsius or higher (usually 260 degrees Celsius), where the deodorizing effect occurs, and then cooled again to about 60 to 70 degrees Celsius, which consumes a lot of energy. This required a lot of energy loss. Therefore, in order to reduce such large amounts of energy consumption and prevent energy loss, it is advantageous to perform more effective heat recovery from the fats and oils in the deodorizing tower.

The present invention effectively recovers the heat of fats and oils during high-temperature deodorization in the vacuum deodorizing tower in order to minimize energy loss within the vacuum deodorizing tower, and uses the recovered heat as an energy source in other energy consuming systems. The object is to provide a very inexpensive heat recovery method and device for use.

In the figure, feedstock oil at about 40 to 80° C. is supplied into a vacuum deodorizing tower 10 via a supply pipe 12 by known means. The raw material oil supplied into the deodorizing tower 10 is first received in the preheating tray 14. The tray 1
4 is provided with a steam pipe 16, whereby the oil in the tray 14 is stirred and heated to about 170 to 180°C. The raw material oil heated in this tray 14 enters the heating tray 18 below. A steam pipe 20 is similarly disposed within this tray 18, whereby the oil heated to 170-180°C is further stirred and heated to an effective deodorizing temperature of 230-270°C. Next, the stirred and heated oil to be deodorized is stirred in a plurality of deodorizing trays 22, 22, 22, and passes through these trays one after another, where odoriferous substances are decomposed and deodorized. The high temperature deodorized oil in these deodorizing trays, preferably at about 260° C., then flows from the final deodorizing tray 22 into a heat recovery tray 24 where the oil is deodorized by cooling water supplied via pipes 26. It is cooled to 210-230°C to perform low-temperature removal of odorous substances. Thereafter, the oil is further cooled to 60 to 70°C by a cooling tray 30 through which a pipe 28 for introducing cooling water is connected, and then taken out from the deodorizing tower 10 as a product oil. Note that odorous substances and the like are discharged from the upper pipe 32 of the deodorizing tower 10 to the outside of the system. The operation of this deodorizing tower 10 is substantially the same as that disclosed in Japanese Patent Application No. 10673/1983 filed earlier by the same applicant.

The heat recovery device 34 of the present invention includes the heat recovery tray 2
This is related to the cooling water introduction pipe 26 introduced into the interior of the cooling water introduction pipe 26. That is, the device 34 of the present invention includes a steam/water separator 36, a water supply tank 38, a device 40 such as a level transmitter that detects the water level in the tank, a control valve 42, and a pipe system 44 that carries high-temperature steam to the outside of the system. , the cooling water consisting of low-temperature soft water as a heat exchange medium is transferred from the water supply tank 38 to the heat recovery tray 24.
a pipe 26b that transports the cooling water heated to high temperature by heat exchange from the tray 24 to the steam water separator 36, a pipe 46 that connects the steam water separator 36 and the pipe system 44, and a water tank 38. It consists of a pipe 48 that connects to the pipe system 44 and a replenishment pipe 50 that carries cooling water to the water supply tank 38 via the control valve 42, providing a high-pressure sealed system.

The room-temperature cooling water supplied into the deodorizing tower 10 through the cooling pipe 26a exchanges heat in the heat recovery tray 24 with oil at about 260° C. which has now undergone high-temperature deodorization. The cooling pipe 26a is disposed in the tray 24 in the form of a coil, preferably divided into four series each having several turns to improve heat exchange efficiency. Therefore, the high temperature oil (approximately 260°C) that has entered the heat recovery tray 24 is kept at a predetermined high pressure (P
Cooling water (room temperature) made of soft water supplied via the pipe 26a from the water supply tank 38 which is pressurized to Kg/cm ² G) is heated to about 210° to 230°. Therefore, the cooling water that has exchanged heat with the oil and fat by the coil-shaped heat exchange element in the tray 24 is vaporized and generates steam when it leaves the tray 24. The steam of PKg/cm ² G generated here is guided to the steam/water separator 36 via the pipe 26b. This separator 36 consists of a hollow, elongated sealing member, and functions to separate the vapor introduced from the vapor introduction section 36a into a gas portion and a liquid portion. The separated gas components are supplied from the gas component supply section 36b to the external pipe 44 via the pipe 46, and are used as desired steam lines, respectively.
On the other hand, the separated liquid portion is discharged from the liquid portion discharge portion 36c.
The water is then returned into the water supply tank 38. This steam/water separator 36 of the present invention has an introduction section 36 as shown in the figure.
It is a horizontal cylinder made of a sealed hollow member, and its structure is extremely simple.

The water supply tank 38 to which the liquid separated from the steam in the pipe 26b returns is simply a horizontal cylinder, and the water level in the water supply tank 38 is constantly monitored by the level transmitter 40.
It is detected by. When the transmitter 40 detects a decrease in the water level, the transmitter sends a signal to that effect, and in response to the signal, the valve 4 connected to the soft water source is activated.
2 is designed to open and close, and the water tank 38
The water level inside is always kept constant. In the present invention, this water level is always located above pipe 26b. As a result, the soft water to the tubes 26a, 26b and the heat exchange coil portion of the tube 26 of the heat recovery tray 24 can be supplied by gravity simply by the weight difference based on the water level difference, and no complicated pressure supply mechanism or control is required. No equipment required. Note that the pipe 48 is the external pipe 4.
4 and the water supply tank 38.

In the present invention, the inclination angle of the steam/water separator 36 can be approximately 10° to 15°, the inner diameter can be 200 mm or more, and the length can be 1300 mm or more, but these values may vary depending on the various capabilities and uses. Let's change. On the other hand, the water supply tank 38 made of a horizontal cylinder can have an inner diameter of 900 mm or more and a length of 1500 mm or more, and the height difference between the liquid level of the tank 38 and the pipe 26b is about 800 mm or more. Of course, these numerical values are not limiting. Furthermore, the pressure within the sealing system of the device of the present invention can be adjusted to 6 to 15 kg/cm ² as required.

Although the diagram showing a specific example of the present invention shows an example in which only one stage of this new heat recovery device is provided, this device is installed in multiple stages until the temperature of the treated fats and oils drops to about 120° or less. This makes it possible to recover heat even more effectively.

That is, the present invention recovers the heat in the deodorizing process of raw oil by heat exchange with cooling water supplied by an extremely simple method, and at the same time separates steam and water by an extremely simple means, thereby producing only effective steam. It is a completely new and useful heat recovery device that does not require any complicated control equipment or other equipment, and it is simple, has almost no failures, and can be used easily and at a very low cost anywhere. The aim is to provide a heat recovery device that can
Note that the heat recovery device of the present invention can be used as a heat recovery device in addition to the deodorizing process of fats and oils.

[Brief explanation of drawings]

The figure shows a flowchart of the apparatus of the present invention and an oil and fat deodorizing tower incorporating the same. Explanation of symbols, 10: Deodorizing tower, 14: Preheating tray, 18: Heating tray, 22: Deodorizing tray, 2
4: Heat recovery tray, 26, 28: Cooling pipe, 30:
Cooling tray, 34: Heat recovery device, 36: Steam/water separator, 38: Water supply tank, 40: Liquid level detection device, 4
2: Control valve, 44: Steam line.

Claims (1)

[Claims] 1. A method for recovering heat from fats and oils after high-temperature deodorization in a deodorizing tower, comprising feeding a level-controlled heat recovery liquid into the fats and oils, The heat recovery liquid is heated to approximately 230°C by heat exchange and vaporized, the vaporized heat recovery liquid is separated into gas and liquid based on the weight difference in a cylinder arranged at an angle, and the separated liquid is reused. Returning the heat recovery liquid to the tank containing the heat recovery liquid; detecting the liquid level in the tank and constantly maintaining the liquid at a position where a certain amount of the liquid is supplied into the oil and fat due to the gravity difference; and gas separated from the heat recovery liquid. A heat recovery method comprising supplying only oil to an external steam line and making it possible to effectively reuse the heat recovered from the oil and fat. 2 A device that recovers heat from fats and oils after high-temperature deodorization in a deodorizing tower has been completed, which includes a liquid feed pipe that feeds a heat recovery liquid into the fats and oils, and a device that exchanges heat in the fats and oils. A steam supply pipe that transports the generated steam at approximately 230°C to a steam separator, a steam separator that separates gas and liquid from the steam supplied by the steam supply pipe, and a steam separator that separates gas and liquid from the steam supplied by the steam supply pipe. a water supply tank that stores the liquid and supplies the heat recovery liquid to the liquid supply pipe, a liquid level detection device that detects the liquid level in the tank and constantly maintains the liquid level at a constant position, and heat recovery. It consists of a liquid replenishment device and a steam line that guides the gas separated by the steam and water separator to the outside of the system. A heat recovery device characterized in that the liquid is gravity fed to a heat recovery liquid supply pipe by maintaining the liquid level in a tank at a constant position. 3. The heat recovery device according to claim 2, wherein the inside of the deodorizing tower is arranged in multiple stages.