JPH0557273A - Waste liquid concentrator - Google Patents

Abstract

PURPOSE:To provide a concentrator for vacuum evaporating waste liquid by solar heat without using fuel and power when concentrating and decreasing waste liquid from factories, etc. CONSTITUTION:Waste liquid 13 in a storage tank 3 is made to flow down and circulated in a solar heat enclosed evaporating case 2. The enclosed case 2 and a solar heat absorbing pipe 6 installed in parallel are connected. Evaporated moisture in the case 2 is given thermal expansion in the absorbing pipe 6 to discharge it to atmosphere. This causes the case 2 to be evacuated and the latent heat of evaporation to be taken away, so that the temp. in the case 2 is kept lower than that in the absorbing pipe 6 to realize vacuum evaporation in the case 2. Thus, a water liquid concentrator is constituted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for concentrating industrial waste liquid in hospitals, factories and the like.

[0002]

2. Description of the Related Art Conventionally, when recovering industrial waste liquid, it is necessary to evaporate water to reduce the concentration and concentration in order to reduce transportation costs and incinerate.

A heating vacuum evaporation method is used for the above-mentioned concentration and weight reduction, a large amount of fuel is required for heating, and power for a vacuum pump is required for vacuum formation, and it is difficult to reduce the concentration and weight reduction cost. There is a problem.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a simple waste liquid concentrating device which does not require a fuel and a vacuum pump, and which uses solar heat to concentrate and reduce industrial waste liquid by vacuum evaporation.

[0005]

In order to achieve the above object, the present invention is to connect a lower portion of a solar-heated evaporation box having a transparent plate stretched on an upper surface to an upper portion of a liquid storage tank. And a discharge pipe provided in the upper part of the evaporation box are connected via a pump, the upper end of the evaporation box and one end of a solar heat absorption pipe are connected, and the other end of the absorption pipe is connected to the atmosphere. Waste liquid concentrating device obtained The waste liquid concentrating device according to the invention described above in which the other end of the absorption pipe is connected to the atmosphere through a deodorizer. The flow rate in the evaporation box by the pump is controlled by the signal of the temperature sensor arranged in the evaporation box. The waste liquid concentrating device according to the first or second invention, which is provided with a control device for adjusting and controlling the temperature in the evaporation box to be equal to or lower than a preset temperature. The above-mentioned first, second or third in which a falling water disperser is provided at the outflow end.
Waste liquid concentrating device according to the invention The first, second, third or fourth invention, wherein the solar heat absorption tube is provided in a box having a transparent plate stretched on the upper surface in a meandering manner in a plane parallel to the transparent plate. Waste liquid concentrator described in each of the above first, second, equipped with an auxiliary heating device for a solar heat absorption tube,
Waste liquid concentrating device according to the third, fourth or fifth invention. In the first, second, third, fourth, fifth or sixth invention provided with a defogging device on the lower surface of the transparent plate of the evaporation box. Consists of the waste liquid concentrators described.

[0006]

According to the present invention, when the collected waste liquid 13 is filled in the storage tank 3 and the pump 5 is started, the waste liquid 13 flows from the upper discharge pipe 4 in the evaporation box 2 into the box 2. Discharged
It flows over a plurality of step-like flow plates 10 and becomes numerous water droplets by the flow water disperser 11 and drops many times, and it collects in the lower part of the box 2, and further from the upper part of the liquid storage tank 3 into the tank 3. Repeat the circulating operation.

Then, the sun rays 14 incident on the evaporation box 2
The temperature inside the box 2 rises due to the accumulation of radiant heat due to
Since the water in the waste liquid 13 in the box 2 is evaporated and the concentration is increased by the amount of evaporation, the water level in the liquid storage tank 3 is lowered.

The evaporated water enters the solar heat absorption tube 6,
While meandering in the box 12, the radiant heat from the sun rays 14 is absorbed and the temperature rises and the volume expands, so that it is released to the atmosphere through the deodorizer 7.

Due to the discharge, the evaporated water in the evaporation box 2 is forcibly sucked into the absorption pipe 6 and the inside of the evaporation box 2 is kept in a depressurized state (vacuum state). Therefore, the waste liquid 1 in the evaporation box 2 is kept.
Evaporation of 3 is accelerated. Then, the temperature inside the evaporation box 2 drops because the latent heat of evaporation is taken away, and is relatively low as compared with the temperature inside the absorption tube 6.

However, when the temperature in the evaporation box 2 rises above a certain limit, BOD and COD in the waste liquid 13 are taken into the evaporated water, so that the temperature in the box 2 is detected by the sensor 8
Is detected, the signal is compared with the set temperature in the control device 9, and a command signal is transmitted to the drive motor 15 of the pump 5 to adjust the rotation speed of the motor 15 by an inverter to adjust the rotation speed of the pump 5. Then, the flow rate is increased to increase the discharge amount from the discharge pipe 4 and increase the amount of waste liquid in the evaporation box 2 to set the temperature in the box 2 to a set temperature (80 ° C.).
Can be kept lower than.

By the above operation, the waste liquid 13 in the liquid storage tank 3
When the water is concentrated and reaches a certain level, the sensor 1 detects the level.
6, the concentrated waste liquid 13 'can be recovered.

On a cloudy day, night, winter, etc., the auxiliary heating device 26 is operated to forcibly heat the solar heat absorption tube 6 and
The inside temperature is prevented from lowering, and the haze on the lower surface of the upper transparent plate 1 of the evaporation box 2 due to the lowering of the outside temperature during the day is removed by the defrosting device 27 to promote the transmission of the sun rays 14 during the day and to radiate heat. It is possible to prevent a decrease in heat storage due to.

[0013]

[Example] A transparent plate 1, 1'made of a synthetic resin film that absorbs or passes solar heat on its upper surface and a box 12 containing a solar heat evaporation tube 2 and a solar heat absorption tube 6 are supported in parallel. The sun rays 14 are made incident on 1, 1 ′. The evaporation box 2 is a closed box, but the box 12 does not need to be closed.

The evaporation box 2 and the box 12 are supported by being tilted as shown in FIG. 1 or FIG.
7 is connected to the upper part of the liquid storage tank 3 and the inlet 5 ′ of the pump 5 is connected to the upper third side surface from the lower end of the liquid storage tank 3;
The detection end of the middle water level detection sensor 16 is arranged at the water level of the inlet 5'to emit a water level detection signal.

Further, the discharge port 5 "of the pump 5 and the spray discharge pipe 4 provided in the upper part of the evaporation box 2 are connected by a pipe 18, and the pump 5 allows the inside of the storage tank 3 in the evaporation box 2 to be connected. The waste liquid 13 can be made to flow down from the top and can be circulated in the liquid storage tank 3.

In the evaporation box 2, sunlight rays 14 are incident from the transparent plate 1 and radiant heat is accumulated to evaporate the water content of the flowing waste liquid 13, thereby concentrating the waste liquid 13.

The upper end of the evaporation box 2 is the solar heat absorption tube 6
Is connected to one end of the absorption pipe 6 by a pipe 19, and the other end of the absorption pipe 6 is connected to the atmosphere from the upright pipe 20 through the cartridge type deodorizer 7 and a suction blower 21 for supplementing the pressure loss of the deodorizer 7 is provided. The absorption tube 6 is meanderingly arranged in a plane parallel to the transparent plate 1'in the box 12, and the heat collecting fin 6'shown in FIG.
Or by arranging it in a mirror gutter 6 ″ as shown in FIG. 5, the sun rays 14 can be reflected and concentrated in the absorption tube 6.

A temperature sensor 8 is provided at the upper end of the evaporation box 2, and a signal from the temperature sensor 8 is used to compare and calculate the set temperature (80 ° C.) and the temperature in the box 2 to drive the pump 5 motor. The rotation speed of 15 is adjusted by an inverter, and when the temperature is higher than the set temperature, the waste liquid 13 in the box 2 is
The temperature can be lowered by increasing the flow rate of.

A plurality of step-like falling plates 10 are provided in the evaporation box 2, and a falling water disperser 11 is provided at the outflow end of the falling plates 10. A wire mesh shown in FIG. 3 (a), a brush shown in FIG. 3 (b), a saw tooth fitting shown in FIG. 3 (c), etc. are used for this disperser 11, and the waste liquid 13 flowing down the falling plate 10 is innumerable water droplets 13 ″. It is possible to measure the expansion of the evaporation area by dispersing and dropping it in the.

It is preferable that the control device 9 has a control function such as an open circuit relay for stopping the pump 5 in response to a detection signal from the water level detection sensor 16.

An electric heater 2 is provided in the lower part of the box 12.
An auxiliary heating device 26 by 6'is provided in the lower part of the solar heat absorption tube 6, and current can be conducted to the heater 26 'on a cloudy day, night, winter, etc. to auxiliaryly heat the absorption tube 6.

Further, rubber wipers 27 'contacting the lower surface of the transparent plate 1 of the evaporation box 2 are erected on the forward / reverse rotating short chains 28, 28 stretched on both sides inside the evaporation box 2, and the chains 28, 28 are connected.
By reciprocating, the fog on the lower surface of the transparent plate 1 is removed by the wiper 27 ', and thus the fog removing device 2
7 can be formed. A plurality of wipers 27 'can be used at equal intervals to reduce the reciprocating distance.

Reference numeral 22 in the figure denotes a concentrated liquid outlet, 2
3 is its on-off valve, 24 is a concentrated liquid transportable storage tank, 25 is an opening / closing plug for cleaning the absorption pipe 6, 29 is a drive sprocket for the short chain 28, 30 is a common drive shaft for the sprocket 29, 31
Is a rail.

[0024]

Since the present invention is constructed as described above, when the waste liquid 13 is concentrated and reduced, there is an effect that it can be evaporated under reduced pressure by solar heat without requiring fuel and power. The odor in the evaporated water is removed by the deodorizer 7. Further, the evaporation temperature of the waste liquid 13 can be automatically controlled to be equal to or lower than the set temperature, and the BO in the waste liquid 13
It is possible to prevent the scattered release of D and COD into the evaporated water. In the evaporation box 2, the waste liquid 13 is dispersed and the evaporation area is expanded, whereby evaporation is promoted.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a waste liquid concentrating device of the present invention.

FIG. 2 is a vertical sectional side view of an evaporation box.

3 (a) (b) (c) FIG. 3 is a perspective view of a staircase flow-down plate.

FIG. 4 is a perspective view of a solar heat absorption tube with fins.

FIG. 5 is a perspective view of a solar heat absorption tube with a mirror gutter.

FIG. 6 is a perspective view of a box provided with an auxiliary heating device.

FIG. 7 is a side view of FIG.

FIG. 8 is a vertical sectional side view of an evaporation box provided with a defogging device.

FIG. 9 is a front view of the defogging device.

[Explanation of symbols]

 1, 1'Transparent plate 2 Evaporation box 3 Storage tank 4 Discharge pipe 5 Pump 6 Solar heat absorption pipe 7 Deodorizer 8 Temperature sensor 9 Control device 10 Step-like flow plate 11 Flowing water disperser 12 Box 26 Auxiliary heating device 27 Fog removal apparatus

Claims (7)

[Claims] 1. A discharge provided in the middle of the liquid storage tank and in the upper part of the evaporation box by connecting the lower part of the evaporation box by solar heat with a transparent plate stretched on the upper surface to the upper part of the liquid storage tank. A waste liquid concentrator in which a pipe is connected via a pump, an upper end of the evaporation box is connected to one end of a solar heat absorption pipe, and the other end of the absorption pipe is connected to the atmosphere. 2. The waste liquid concentrating device according to claim 1, wherein the other end of the absorption pipe is connected to the atmosphere through a deodorizer. 3. A control device for adjusting the flow rate in the evaporation box by the pump according to a signal of a temperature sensor arranged in the evaporation box to control the temperature in the evaporation box to a set temperature or lower. ) Or the waste liquid concentrator according to (2). 4. A plurality of step-like falling plates are provided in the evaporation box,
A downflow water disperser is provided at the outflow end of the downflow plate.
(1) The waste liquid concentrating device according to (2) or (3), respectively. 5. The solar heat absorption tube according to claim 1, wherein the solar heat absorption tube is provided in a box in which a transparent plate is stretched on the upper surface so as to meander in a plane parallel to the transparent plate. (1) (2) (3) or (4) Waste liquid concentrator described in each. 6. The waste liquid concentrating device according to claim 1, further comprising an auxiliary heating device for a solar heat absorption tube. 7. The waste liquid concentrating device according to claim 1, further comprising a defrosting device provided on the lower surface of the transparent plate of the evaporation box. (1) (2) (3) (4) (5) or (6)