JPH0373761B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat recovery device in a deodorizing tower used in oil refining.

Prior Art When deodorizing and refining oil using a deodorizing tower connected to a vacuum device, it is necessary to introduce high-temperature steam (about 120° C.) into the deodorizing tower. In this case, conventionally, the steam was directly introduced from a boiler, released into the oil, and fatty acids or volatile components, which were odor components, in the oil were absorbed and discharged in a vacuum.

Problems to be Solved by the Invention For this reason, in the conventional technology, a boiler for generating steam to be sent to the deodorizing tower was indispensable. On the other hand, there are various types of high-temperature wastewater inside the factory.
In many cases, these high-temperature wastewaters were simply discarded as industrial wastewater. In other words, while some high-temperature wastewater is wastefully discarded within the same factory,
They were carrying out the contradictory task of producing new high-temperature steam.

Means for Solving the Problems The present invention recovers necessary blown steam for deodorization or distillation from high-temperature wastewater, and supplies high-temperature exhaust gas from a boiler for heating trays to heat the steam as needed. After the exchange, the vapor is introduced into a deodorizing tower to perform deodorizing work.

Function: An evaporator for high-temperature factory wastewater is connected to the conventional boiler connection pipe.

Embodiment In the figure, the upper and lower ends of a deodorizing tower 10 are connected to a vacuum device 12 and a product unloading device 14, which are not shown and are known per se. Inside the deodorizing tower 10, there is a deodorizing tray 1 to which deodorizing steam is supplied from a steam pipe 16 and thereby performs a deodorizing action.
8a...18n are arranged.

The steam pipe 16 is connected via a pipe 20 to an evaporator 22 which operates under reduced pressure. A heat exchanger 21 is preferably interposed in the tube 20 . The evaporator 22 is heated to high temperatures (approximately 70 to 95 degrees Celsius) generated in the factory.
The waste water from the above) flows in through a pipe 24, generates low-temperature evaporation in an evaporator 22 that operates under reduced pressure, and then passes through a pipe 26 as low-temperature water to the pump 2.
It is released through 8.

As mentioned above, since the evaporator 22 is connected to the deodorizing tower 10 and the vacuum device 12 via the pipes 20 and 16, low-temperature steam is formed by low-temperature evaporation of high-temperature water supplied to the evaporator 22, which operates under reduced pressure. can enter the deodorizing tower 10 at any desired time. The steam that entered the deodorizing tower 10 is due to the low pressure inside the deodorizing tower 10.
Deodorizing trays 1 such as preheating tray 18a, heating tray 18b, cooling tray 18n, etc. while causing low-temperature evaporation.
Enter the oil within 8a to 18n. The oil in the deodorizing trays other than the low-temperature cooling tray in the lower part of the deodorizing tower is always maintained at about 250°C, so the low-temperature evaporated steam undergoes heat exchange with the oil. The temperature rises to approximately 250℃. As a result, odor components such as fatty acids are vacuum-sucked by the low-temperature steam formed from the high-temperature water, and deodorization is completed, as in the conventional case.

Therefore, according to this device, a boiler for sending high-temperature steam to the steam pipe 16 is not necessary.

It should be noted that, as will be apparent to those skilled in the art, factory wastewater is circulated between the evaporator 22 and the pump 28 in order to produce more efficient deodorizing steam. Then, the evaporator 22 is replenished from the high-temperature waste water only for the insufficient amount of steam sucked from the evaporator 22 into the vacuum device 12. Furthermore, in order to maintain a constant water temperature in the evaporator 22 so as to perform deodorizing work of a constant quality, it is also possible to exchange heat between the water in the evaporator and high-temperature factory wastewater using a heat exchanger 30. Furthermore, heating tray 18b
The high-temperature exhaust gas coming out of the dedicated boiler 19 is transferred to the pipe 23.
It is also possible to introduce the deodorizing low-temperature vapor into the heat exchanger 21 in the tube 20 via the evaporator 22, thereby raising the temperature of the deodorizing low-temperature vapor supplied from the evaporator 22 to the deodorizing tower 10.

Effects of the Invention In the present invention, the deodorizing steam is obtained from factory wastewater, so the conventional dedicated boiler for generating deodorizing steam is no longer necessary.

Factory wastewater steam has a temperature of about 70 to 95°C, but because it is used under vacuum, low-temperature evaporation occurs, and oil during deodorization easily raises the temperature to the conventional deodorizing steam temperature. Therefore, the deodorizing efficiency is not reduced.

By circulating the steam between the evaporator and the pump, the desired deodorized steam can be obtained.

The temperature of the deodorized steam can be raised using the high-temperature exhaust gas from the boiler dedicated to the heating tray.

[Brief explanation of drawings]

The drawing shows the novel deodorizing device of the present invention. Explanation of symbols, 10: Deodorizing tower, 12: Vacuum device,
18a...18n: Deodorizing tray, 19: Boiler,
21: Heat exchanger, 22: Evaporator, 24: High temperature factory wastewater supply pipe, 26: Low temperature factory wastewater discharge pipe, 28:
Pump, 30: Heat exchanger.

Claims (1)

[Claims] 1. In a blowing steam supply system for an oil refining deodorizing device or distillation device that deodorizes and refines oil using steam supplied from a steam pipe, high-temperature factory waste liquid is used as deodorizing steam, so the waste liquid is stored and depressurized. an evaporator operating under the evaporator; a pump for circulating the effluent in the evaporator through a heat exchanger to maintain the effluent vapor at a constant temperature; a pump located between the evaporator and the steam pipe; a heat exchanger that exchanges heat of the blowing steam sent from the evaporator to the deodorizing tower or distillation tower with the high-temperature exhaust gas discharged from the dedicated boiler of the heating tray;
A blown steam supply system in a deodorizing apparatus, characterized in that the steam in the evaporator is heat-exchanged with high-temperature exhaust gas discharged from a dedicated boiler of the heating tray, and then supplied directly to a steam pipe.