FI81016B - Distilling plant - Google Patents

Abstract

The invention relates to a distilling plant, which comprises a frame 1, an evaporation condenser 8 and a fan 11, plus the necessary pipelines. The lower part of the evaporation condenser acts as a distillate cooler, so that separate preheat exchangers are unnecessary. The evaporator side in the evaporation condenser is full of a porous material 20. <IMAGE>

Description

1 81016

TISLAINLAITE

The invention relates to a distillation device operating on the principle of a steam compressor, which comprises a body part, an evaporator condenser, a fan and the necessary piping.

In a steam-compressor-operated distiller, the energy that maintains the process is obtained by a compressor fan, which generates a vacuum on the evaporator side and an overpressure on the condenser side. The energy released in the condenser is transferred to the evaporator and the water there evaporates. The evaporation temperature can be selected as desired. by changing the internal pressure of the device.

The most common application for this type of equipment has been the production of freshwater from seawater. The heat transfer surfaces of the known devices have been metallic, so that the corrosion problems have been great. Finnish patent application 883947 discloses a solution in which heat transfer surfaces are made of a thin plastic film. The process according to the patent application is traditional and has separate preheat exchangers for distillate and wastewater. With its control systems, pumps and piping, such a system easily becomes expensive and reliability suffers.

In order for a steam compressor distillation apparatus to be competitive with other methods, e.g. reverse osmosis, the plant must be simple and inexpensive.

The purpose of the device according to the invention is to eliminate the above drawbacks.

The device according to the invention is characterized by what is stated in the claims below.

The price of a traditional steam compressor distiller is roughly as follows: 1/3 fan, 1/3 evaporator-condenser and 1/3 other equipment. In the device according to the invention, the price of the evaporator condenser and other devices can be reduced by about 75%, whereby the total price is only half of the price of a conventional plant.

If a vacuum is applied to the salt water side with a spatula, a degassing system, e.g. an ejector, is required on the distillate side. The only adjustment of the plant is by adjusting the amount of seawater.

81016

In most evaporators, the liquid to be evaporated is drained along the heat transfer surfaces. In the device according to the invention, the liquid to be evaporated rises in the porous material between the heat transfer surfaces under the influence of heat, water vapor and porosity.

Porous material also has another purpose.

It prevents water from mixing between the heat transfer surfaces. Thus, when the plant is in operation, there is a considerable temperature difference between the upper and lower part.

On the condenser side, pockets are formed in the lower part, where the distillate collects and cools under the influence of seawater.

The accompanying drawings illustrate a distillation apparatus according to the invention.

Figure 1 shows a side view and section of a device according to the invention.

Figure 2 is a side view of the evaporator condenser and partially opened.

Figure 3 is a cross-sectional view of the evaporator condenser.

In Figure 1, the number 1 refers to the body of the device. The feed pump 2 raises the seawater through the valve 3 to the lower space 5 of the supply pipe 4. The double pipe 6 adjusts the height of the water surface 7. The evaporator condenser is number 8 and its ends 9. The steam duct is number 10 and the compressor fan 11.

There is a front chamber 12 and a rear chamber 13 with a distillation basin 14 at the bottom.

The sewage drain pipe is 19.

In Figure 2, the number 20 refers to a porous material.

The number 21 denotes holes to facilitate the escape of steam. The distillate accumulates at the bottom of the condenser in space 22. The surface of the distillate water is 23.

The distillation device according to the invention operates in the following way:

Pump 2 feeds the water to be distilled to the distiller. The amount of supply water is regulated by a valve 3, which is controlled by the temperature of the outlet pipe 19. In the lower part 5 of the apparatus, seawater continuously flows, which cools the distillate in the space 22. As the evaporation progresses, the porous material 20 continuously absorbs the new water to be evaporated. The difference between the seawater surface 7 and the distillate water surface 23 is determined by the pressure difference of the fan 11 when thin plastic films are used as heat transfer surfaces. Holes 21 facilitate the escape of steam from the evaporator. The double pipe 6 is adjustable 3 81016 and can be used to raise and lower the seawater surface 7. The generated steam is sucked through a duct 10 by a fan 11 to a condenser where it is converted to a distillate and flows to the condenser bottom 22, from where it flows to the end chamber bottom 14. From here the distillate and gases are removed by a system of ejector 16 and pump 17.

It is clear that the above implementation of the invention can be modified with different materials and by designing the device differently without, however, falling outside the scope of the invention.

Claims (4)

4,81016 Steam compressor distillation apparatus comprising a body (1), an evaporator condenser (8), a fan (11) and piping (4, 15, 19) characterized in that the lower part of the evaporator condenser (8) acts as a distillate cooler and that the evaporator section is filled with material (20). Device according to Claim 1, characterized in that holes (21) are provided in the upper part of the porous material (20) in order to improve the flow of steam. Device according to Claim 1, characterized in that the process is controlled by a valve (3) according to the temperature of the waste water in the pipe (19). Device according to Claim 1, characterized in that the seawater surface (7) can be adjusted by means of a double pipe (6). li 5 81016