JP2002143618A - Waste liquid concentrating device and waste liquid concentrating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waste liquid concentrating device in which miniaturization is made to take precedence over concentrating performance and is facilitated and the use can be properly changed as a waste liquid concentration device rather than an evaporator, and a waste liquid concentrating method. SOLUTION: An inner cylinder 11 is disposed inside an outer cylinder 10. Waste liquid 8 is collidedly introduced to the surface of the inner cylinder 11. The inner cylinder 11 is provided with a passage part 15 in which a gas portion is preferentially passed than a liquid portion. The liquid portion is adsorbed and attached on a surface, in particular, the outer surface of the inner cylinder 11 and gravitationally flows down through the surface. Thus, the outer surface of the inner cylinder 11 forms a fluidized surface which flows downward in the vertical direction. A resistance part 14 which is a liquid cutting plate is disposed on the lower part of the inner cylinder 11 and imparts a resistance to an ascending stream. The resistance part 14 has an intersecting surface which is continued on the fluidized surface and intersects the fluidized surface. The resistance part 14 imparts a resistance to an ascending stream and, therefore, lessens the fear of scattering droplets which drop from the periphery of the intersecting surface of the resistance part 14. Waste liquid concentration is thus made to take precedence over steam generation and the miniaturization of the device is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste liquid concentrating apparatus and a waste liquid concentrating method for concentrating waste liquid discharged from various plants and living spaces.

[0002]

2. Description of the Related Art In factories, buildings, and plants, waste liquid is discharged together with waste heat. A waste liquid is concentrated by utilizing waste heat, and the waste liquid is discarded or treated before disposal. For concentration,
Evaporation is used. FIG. 7 shows an evaporative waste liquid concentrating apparatus 101.
Is shown. The waste liquid 102 circulating from the upper part of the concentration device 101 is introduced, and the concentrated waste liquid 1 is concentrated by evaporation.
03 is discharged from the lower part of the concentration device 101 and returned to the concentration device 101 again. Concentrator 10 as a cylindrical container
A cylindrical steam exhaust pipe 104 is disposed in a central region of an upper portion of the steam exhaust pipe 104. The waste liquid 102 is introduced tangentially into an annular space formed between the concentrating device 101 and the steam exhaust pipe 104, and while the waste liquid 102 is rotating in a rotational flow in the annular space, the liquid component is condensed. It adheres to the inner peripheral wall surface of 101 and flows down the inner peripheral wall surface by gravity. Other liquid components of the waste liquid 102 introduced into the concentration device 101 are gravity-selected and fall by gravity. The vapor component of the waste liquid 102 evaporating from the waste liquid 102 introduced into the concentrating device 101 becomes an updraft, and the demister (network structure film) 105 of the steam exhaust pipe 104
And is discharged from the upper end of the steam exhaust pipe 104.

Such an evaporator, which has been developed and technically matured as a gas-liquid separator, has a high gas-liquid separation effect due to the centrifugal separation effect, but has a large diameter in order to exert the centrifugal force effect more. Designed. For this reason, centrifugal concentrators tend to be designed with large diameters. Even if the effect of centrifugal separation is not so high, it is often desired by users to reduce the size of the evaporator used for concentrating the waste liquid rather than the concentrating performance.

[0004] The miniaturization is prioritized over the concentrating performance, and there is a demand from the user that the use of the waste liquid concentrating apparatus be optimized rather than as an evaporator.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a waste liquid concentrator in which the miniaturization is prioritized and promoted over the concentration performance, and the use of the waste liquid concentrator is appropriately changed as a waste liquid concentrator rather than as an evaporator. An object of the present invention is to provide a waste liquid concentrating method.
It is another object of the present invention to provide a waste liquid concentrator in which the miniaturization is promoted more than the concentration performance, the use is appropriately changed as a waste liquid concentrator rather than an evaporator, and the production cost is reduced, and a waste liquid concentrator. It is to provide a method.

[0006]

Means for solving the problem are described as follows. The technical items appearing in the expression are appended with numbers, symbols, and the like in parentheses (). The numbers, symbols, and the like are technical items that constitute at least one embodiment or a plurality of the embodiments of the present invention, in particular, the embodiments or the examples. Corresponds to the reference numerals, reference symbols, and the like assigned to the technical matters expressed in the drawings corresponding to the above. Such reference numbers and reference symbols clarify the correspondence and bridging between the technical matters described in the claims and the technical matters of the embodiments or examples. Such correspondence / bridge does not mean that the technical matters described in the claims are interpreted as being limited to the technical matters of the embodiments or the examples.

[0007] The waste liquid concentrating apparatus according to the present invention comprises an outer cylinder (1).
0) and an inner cylinder (11) arranged inside the outer cylinder (10).
It is composed of The outer cylinder (10) is a waste liquid flow (8)
Is provided with an opening (16) through which the gas is introduced. Inner cylinder (1
1) has a passage portion (15) through which a gas portion passes preferentially over a liquid portion. The liquid portion adsorbs and adheres to the surface of the inner cylinder (11), particularly to its surface and the outer surface, and flows down the surface gravitationally. Thus, the surface of the inner cylinder (11) forms a flow surface in which the liquid portion flows vertically downward. The resistance part (14) is arranged in a lower part of the inner cylinder (11) and gives resistance to the upward flow. The resistance portion (14) has an intersecting surface that is continuous with (follows) the intersecting flow surface. The waste liquid stream is introduced into the outer cylinder (10) so as to collide with the inner cylinder. Since the resistance part (14) gives resistance to the rising steam flow, the danger of blowing off the liquid dripping from the periphery of the crossing surface of the resistance part (14) is reduced.

The intersection plane is orthogonal to the flow plane. Alternatively, the intersection plane is inclined with respect to the flow plane. The intersection line where the flow surface and the intersection surface intersect is elliptical. The resistance portion (14) forming such a crossing surface or a crossing line is a liquid drainage plate formed as an outer annular portion of a flat plate obliquely crossing the cylinder (hereinafter, the resistance portion will be described as a liquid drainage plate). ). In this case, the inner cylinder is a cylinder. The cylinder has low resistance to centrifugal flow. Alternatively, the intersection plane is a conical surface. The lower end portion of the obliquely draining plate (14) necessarily has a sharp shape, and can facilitate draining. Liquids that gather in sharp parts and have a large mass are less likely to be blown off by a steam flow having a low flow velocity due to the resistance of the liquid drain plate (14).

In the waste liquid concentrating method according to the present invention, the waste liquid stream (8) is supplied to the inner cylinder (1) disposed in the outer cylinder (10).
1) causing the liquid to adhere to the surface of the inner cylinder (11) and causing the liquid portion to flow down on the surface; and having an upper surface following the surface of the liquid flowing down on the surface of the inner cylinder (11). Flowing on the drain plate (14), draining the liquid portion flowing on the upper surface of the drain plate (14) at the periphery of the drain plate (14), and vapor flow on the lower surface of the drain plate (14) And to provide resistance. The upper surface is preferably inclined with respect to the vertical direction.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Corresponding to the drawings, an embodiment of a waste liquid concentrating device according to the present invention has a concentrating device as an evaporator incorporated in a waste liquid concentrating cycle. As shown in FIG. 1, a waste liquid 4 is introduced from a waste liquid tank 3 by a pump 2 into the concentration device 1. The waste liquid 4 stays in the lower part of the concentration device 1. A part of the waste liquid 4 is sent to a heater 6 by a pump 5. High-temperature steam 7 discharged from a plant (not shown) is introduced into the heater 6. The heater 6
This is a heat exchanger in which heat exchange is performed between the waste liquid 4 and the high-temperature steam 7.

The waste liquid 8 to be concentrated heated by the heater 6
Is introduced into the concentration device 1. The two-phase stream containing the heated and partially evaporated steam is injected towards the central region of the concentrator 1. The waste liquid 8 to be concentrated thus injected
Is separated into gas and liquid in the concentrator 1. The vapor separated by gas-liquid is discharged to the outside of the concentrator 1 by the vapor pressure from the top of the concentrator 1 and is led out to the condenser 9. The water liquefied in the condenser 9 is discharged from the condenser 9.

FIG. 2 shows the concentrating device 1 in detail.
The concentrating device 1 includes an outer cylinder 10 and an inner cylinder 11 inside the outer cylinder 10.
Is arranged. A part of the inner cylinder 11 is
Through the ceiling wall 12 in the vertical direction. The inner cylinder 11
It is composed of a cylindrical portion 13 and a drain plate 14. A demister portion 15 is formed in the cylindrical portion 13 in a band shape. The demister portions 15 are arranged in two stages. The demister portion 15 is formed of an appropriate mesh retina. The demister portion 15 is not limited to the retina and can be formed as a perforated cylindrical plate. Demister part 15
Has physical properties that allow vapor to pass through but not liquid.

As shown in FIG. 3, a part of the outer cylinder 10 is opened to form an opening 16. Wastewater to be concentrated 8
Passes substantially straight through the opening 16 and collides with the cylindrical surface of the cylindrical portion 13 at a substantially right angle. The liquid drain plate 14 has a cylindrical portion 1.
3 is a flange joined to the lower end. Drainer 14 and cylindrical part 1
The bonding surface or bonding line of No. 3 is elliptical, and the plane including the bonding surface has an inclination angle of about 45 degrees with respect to the vertical direction. The lower end of the cylindrical portion 13 is open and the opening 1
7 is formed. The lower end portion 18 of the elliptical ring-shaped drainer plate 14 is a radially sharpened sharp portion 19. The shaping to sharpen the sharpened portion 19 for better drainage can be designed freely.

Examples of the waste liquid include rust water mixed with rust in an iron pipe of a plant, washing water discharged when cleaning a building, and washing water discharged when washing work clothes. Large amounts of hot water and hot water are discharged from power generators, air conditioners, etc. in multi-person gathering areas such as plants, living condominium buildings, and business buildings. The waste liquid heated to a high temperature by exchanging heat with the hot water is introduced into the concentration device 1 as shown in FIGS. 2 and 3. The waste liquid stream or the two-phase flow, which is a mixture of the vapor stream and the waste liquid stream, collides with the outer surface of the cylindrical portion 13 and a part of the two-phase flow is adsorbed on the outer surface while the cylindrical portion 13
Further, a part thereof is vaporized while making a half circle on the peripheral surface of the cylinder. Another part of the two-phase flow is further vaporized while being scattered in the space around the inner cylinder 11. The droplets thus scattered fall by gravity against the rising steam flow and are separated from the steam by gravity.

The vaporized vapor enters the demister portion 15 of the inner cylinder 11 by its own vapor pressure, and travels from the top of the inner cylinder 11 to the condenser 9 as described above. The waste liquid flowing on the peripheral surface of the cylindrical portion 13 is braked by viscous resistance and flows downward vertically downward by gravity due to gravity. The downward flow a flows on the inclined surface of the upper surface of the draining plate 14 as shown in FIG. 4 to flow and flow down as an oblique flow b, and as shown in FIG. Swells on the front and back surfaces of the liquid droplets 21 to form droplet-shaped water droplets 21, but the volume of the droplet-shaped water droplets (waste liquid water droplets) 21 further increases and drops as droplets 22. In the concentrating device 1, an upward air flow c is generated as a whole, and the upward air flow c may cause the droplet-shaped water droplets 21 to be blown off before draining. The entire amount of liquid water that forms is large and heavy droplet-shaped water droplets 21 at the sharp portion 19, and such a fear is eliminated, and the droplets 22 fall more reliably as droplets 22.

The adsorption separation in which the liquid phase is separated from the gas phase by being adsorbed on the inner surface of the cylindrical portion 13 is inferior to the centrifugal separation of a conventional evaporator in terms of the separation efficiency. The benefits of shortening are significant.

FIG. 6 shows another embodiment of the waste liquid concentrating apparatus according to the present invention. The present embodiment is different from the above-described embodiment in that a skirt 14 'which is a drainer is used in place of the drainer 14 of the above-described embodiment. The skirt 14 ′ is a truncated conical oblique plate, and the downward flow a flowing down the peripheral surface of the cylindrical portion 13 is distributed substantially uniformly over the entire circumference to flow down the skirt 14 ′. The liquid droplet or liquid layer swelling at the circular lower edge of the skirt 14 ′ is resisted by the wraparound flow d guided to the upper surface of the skirt 14 ′ in the rising airflow c, but is adsorbed on the skirt 14 ′ and blown off. There is little fear.

[0018]

The waste liquid concentrating apparatus and the waste liquid concentrating method according to the present invention give priority to the adsorption and separation of the waste liquid, but the drain plate effectively prevents scattering of the adsorbed waste liquid by the vapor flow. Although the centrifugation effect is smaller, the miniaturization of the device is promoted, and the concentration effect of the concentrator is obtained as a priority benefit over the evaporation effect of the evaporator.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an embodiment of a waste liquid concentrating apparatus according to the present invention.

FIG. 2 is a sectional view showing an embodiment of a waste liquid concentrating device according to the present invention.

FIG. 3 is a plan sectional view of FIG. 2;

FIG. 4 is an oblique-axis projection view of a part of FIG. 2;

FIG. 5 is a front view showing the operation of the liquid drainage.

FIG. 6 is a sectional view showing another embodiment of the concentrator according to the present invention.

FIG. 7 is a cross-sectional view showing a known evaporative waste liquid concentration device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Concentrator 8 ... Waste liquid flow 10 ... Outer cylinder 11 ... Inner cylinder 14 ... Resistance part (liquid-draining plate) 15 ... Passing part

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G21F 9/08 521 G21F 9/08 521H F term (Reference) 4D031 AB03 BA07 BA10 BB04 BB10 EA01 4D034 AA11 BA01 CA12 4D053 AA01 AB02 BA01 BB07 BC03 BD04 CC01 CC04 4D058 JA12 JB03 JB06 JB24 JB25 KB12 QA01 QA07 SA15 UA01

Claims (7)

[Claims] 1. An outer cylinder, comprising: an inner cylinder disposed inside the outer cylinder, the outer cylinder having an opening through which a waste liquid flow is introduced, wherein the inner cylinder is more gaseous than a liquid portion. The inner cylinder surface forms a flow surface in which the liquid portion flows vertically downward, and is disposed in the lower portion of the inner cylinder to provide resistance to ascending flow The waste liquid concentrator according to claim 1, further comprising a resistance part, wherein the resistance part has a cross surface that intersects the flow surface following the flow surface, and the waste liquid flow collides with the inner cylinder. 2. The waste liquid concentrator according to claim 1, wherein said crossing surface is orthogonal to said flow surface. 3. The waste liquid concentrator according to claim 1, wherein said crossing surface is inclined with respect to said flow surface. 4. The waste liquid concentrator according to claim 3, wherein a crossing line at which the flow surface and the crossing surface intersect is elliptical. 5. The waste liquid concentrating device according to claim 3, wherein said crossing surface is a conical surface. 6. The method according to claim 6, further comprising: causing a waste liquid flow to collide with an inner cylinder disposed in the outer cylinder; adhering a liquid portion to a surface of the inner cylinder to cause the liquid portion to flow down on the surface; Flowing the liquid portion flowing down on the surface of the liquid draining plate having an upper surface following the surface; draining the liquid portion flowing on the upper surface of the liquid draining plate at the periphery of the liquid draining plate; Providing a resistance to the steam flow at the underside of the drainer. 7. The waste liquid concentrating method according to claim 6, wherein said upper surface is inclined with respect to a vertical direction.