JPS5926184A - Compressed steam-type distillation of salt water - Google Patents

Abstract

PURPOSE:To perform efficient evaporation with the saved consumption amount of electric power, by adding the condensation heat of a heat medium compressed by a heat medium compressor to the distiller of an apparatus for distilling salt waterm and evaporating the liquefied heat medium by heat exchanging it with water discharged from the distiller. CONSTITUTION:A heat-pump apparatus 5 has a compressor 11 to be driven by a motor, a condenser 10, a throttle valve 12 and an evaporator 13 provided in a closed circuit, and a heat medium such as flon is circulated through said circuit. The evaporator 13 exchanges the heat of concd. water of about 19 deg.C introduced through a pump 14 and a pipe 15 from a heat exchanger 4. Flon is evaporated, while the concd. water is further cooled down to a lower temp. and drained through a pipe 16. Hereon, the evaporated flon of about 14 deg.C is adiabatically compressed by a compressor 11, heated up to about 73 deg.C, itroduced into the condenser 10 and then heat exchange with preheated raw salt water of about 68 deg.C to transfer condensation heat to it. The raw salt water is heated up to about 71 deg.C, while the flon is condensed, converted into a gaseous phase through the throttle valve 12 and recycled.

Description

DETAILED DESCRIPTION OF THE INVENTION Distillation is one of the least energy-consuming methods for desalination of brine, in which the water vapor generated from the brine to be distilled is directly compressed.

The first means of further lowering the energy consumption rate of this distillation method is to improve the performance of the brine distiller so that thermal equilibrium can be maintained even when the steam compressor is operated at a small compression ratio. It is. The second of these measures is to reduce the energy supply to maintain the brine still at operating temperature (above ambient temperature).

The present invention relates to the second of said means. If the water vapor compressor is operated at a small compression ratio to save energy, the amount of power converted into heat will naturally decrease, and when cold raw water is supplied, the entire brine distillation temperature (in accordance with the present invention) will be reduced. example, it is of little use in maintaining the temperature (72°C). Therefore, a large amount of energy must be added from the outside just for the purpose of heating, and if this amount of energy is large, the overall energy consumption will be large5.
By carrying out the present invention, this heating energy can be reduced to several minutes, thereby increasing the energy saving effect of the entire process.

In order to fully improve thermal efficiency, conventional steam compressors use a heat exchange method that imparts heat from the generated condensed water and discharge source water to the raw water, but this alone still does not reach the brine evaporation temperature. remains in the vomit area and is not sufficient. In order to make up for this lack of heat and allow the salt water distiller to maintain the specified operating temperature, methods have been used such as adding steam from outside or using all the heat from the exhaust gas, but the simplest method is Ma'
(This is because electricity is an energy that can be used widely regardless of location or condition. However, as is well known, when electricity is used as heat, it produces 860 Kcal per IKWH. It is the most expensive energy source and does not generate heat.
If it is used as ca 1 minute, the cost will be high and about 1 μs will be lost. In view of the above, the present invention has developed
By using a method of pumping up the retained heat of discharged concentrated water, etc. using a heat pump and supplying it to the distiller, normal evaporation can be performed while maintaining high temperature using the heat source of the pond and consuming only a small amount of electricity. This was done for the purpose of saving energy.

To explain this numerically, for example, in order to perform evaporation at about 70℃ using only an electric heater (approximately 12,040Kca)
Requires 1/h of heat. This is approximately 141 Kcal/h in terms of electric power. However, if a 5.5 kW heat pump pumps heat from 14°C to 73°C, it will be approximately 7'/30 Kcal/h based on the data of a commercially available heat pump.

The calorific value of the 5.5 kw heat pump is 4730 Kca
l/h (5.5kw x 860Kca 1/h)
The effective S-eating for Katuguchi fever is 7730 + 473.
0 = 12460 Kcal/h, which approximates the amount of heat in the case of electric power only, and therefore, the required power of 14 KWH provides heating efficiency.

An embodiment of the present invention will be described with reference to the accompanying drawings. The steam compression salt water distiller 1 mainly includes a distiller main body 2, a steam compressor 3 driven by a motor, a heat exchanger 4, and a heat pump device 5 for pumping the temperature of discharged water to feed water.

In the above apparatus 2, raw brine at about 15° C. is supplied through pipe 6, branches into heat exchanger 4, and undergoes heat exchange with condensed water and concentrated water through tube bundle 7.8, It is heated to about 68°C. The salt water after heat exchange is combined and led to the condenser 10 of the pipe 9 all-oil heat pump device.

The heat pump equipment @5 is a compressor 11 driven by a motor,
A condenser 10, an aperture 12, and an evaporator 13 are installed in a closed circuit, and the 8-circuit is filled with heat like freon! The evaporator 13 is connected from the heat exchanger 4 to the pump 14 and the pipe 1.
The fluorocarbons undergo heat exchange with the concentrated water at about 19°C introduced through step 5, and the concentrated water (further becomes a substitute and is discharged from pipe 16. 1
1, the temperature rises to about 7301, enters the condenser 10, and the preheated raw material of about 68C 1=
1. Heat exchange with salt water to give heat of condensation and heat to approximately 71°C. After condensing, the freon passes through the throttle 12 and becomes a gas phase and is recirculated.

In this way, the unreleased water from the distiller is drained, sorted and collected, and the raw brine heated by the heat of condensation of the chlorofluorocarbons in the compressor is heated in the distiller main body 2 in 17 ways. The water vapor accumulates in the tray 18, and is then transferred to the heat transfer tube 19 (C). Steam at about 73.5°C, which has been compressed by the steam compressor 3, is introduced into the heat transfer tube, and the water vapor is compressed by the steam compressor 3. Evaporation occurs, the generated steam (passes through the pipe 20, is suctioned to the steam compressor 3 at a suction pressure of 1 ml, and the vapor (1ml) flows into the bottom 21, passes through the pipe 22, and reaches the heat exchanger 4 at about 720). ,
The raw material brine is also replaced. On the other hand, the Togo steam condenses inside the horizontal heat transfer tube 19, flows down from the tube and collects in the condensed water reservoir 23, and is introduced into the heat exchanger 4 at about 73.5° C. through the tube 24, where it exchanges heat with the raw brine. , and is taken out from the pump 25 and tube 26 at about 19°C. An air extraction device 27 is connected to the upper part of the condensed water reservoir 23 to remove non-condensable gas. Emitted into the atmosphere.゛In the illustration, in order to add the heat of condensation of the heating medium compressed by the compressor to the steam compression distiller, a means of adding the raw brine V is used, but it is not limited to the raw brine, but it can also be added to an appropriate place in the steamer body. It is a theory that 1 ounce of thin ice and condensed water can be added, and that heat recovery can also be performed from the condensed water. In addition, conventional salt water other than chlorofluorocarbons can be used for the heat treatment, and raw salt water includes ground water, industrial wastewater, seawater, etc., and can be widely applied.

Note that the water vapor pressure, depression machine, and natural medium pressure pongee machine are not necessarily limited to motor drive, but motor drive is the simplest method.

In the present invention, a steam compression salt water distiller and a heat pump device are combined to condense the compressed heat medium, add heat to the distiller, and add hot water to the evaporation temperature. If the specified heating is carried out at a high temperature and with a moderate amount of electricity, 7 times can be achieved, resulting in energy savings.

In this way, in the present invention, only electric power is supplied during distillation, and the evaporation can be carried out efficiently with a small amount of electric power.
7) Best stone for harvesting.

[Brief explanation of the drawing]

The figure is a flow sheet in Example V of the present invention. 1 Water vapor pressure, ml 2 Steam steamer 2 Distiller body 3
・・Steam compressor 4・Thermobunder device 5・Hitobump device 7.8・Pipe bundle 10 Condenser 11EF
, compressor 12 throttle 1.3 evaporator 18, tray 19, horizontal heat transfer α 23, condensate reservoir 27
Air bleed device patent issuer: Sasakura Machinery Co., Ltd. 1982 Special revision application No. 137690 2, title of invention 71 (FA ET', IIW type IY 7 water fA distillation method 4, supplementary IL order day 4 spontaneity 5 , Complement m to J: Number of inventions increasing by 06, Complement i [
Part 1 of the Detailed Description of the Specified Invention

Claims (1)

[Claims] In a salt water distillation apparatus in which water vapor generated from salt water is compressed with a steam compressor and then condensed with a distiller,
A steam compression type in which the heat of condensation of the heating medium compressed by the heating medium compressor is added to the distiller of the salt water distillation apparatus, and the liquefied heating medium is evaporated by exchanging heat with the discharged water from the distiller. Salt water distillation method.