KR100454856B1 - Apparatus for evaporating and concentrating waste water by direct heating - Google Patents

Abstract

The present invention relates to a direct heating wastewater evaporation concentrator. It is a direct heating type wastewater evaporation concentrator having an evaporation concentration tank, a hot air supply unit, and a hot air guide mechanism, the hot air supply unit comprising: a; A combustion chamber for heating the high pressure air supplied from the outside, a hot air guide pipe installed in the lower portion of the combustion chamber and injecting hot air heated through the combustion chamber into the waste water, and the hot air guide pipe surrounding the hot air guide pipe, the lower end of which is inside the evaporation concentration tank. It characterized in that it comprises an outer pipe extending in the, and the space between the hot air guide pipe and the outer pipe and the injection nozzle for cooling the hot air guide pipe by spraying the waste water pumped from the evaporation tank to the hot air guide pipe side.

The present invention made as described above, the hot air guide pipe through which hot air passes by circulating the waste water in the evaporation concentration tank, so that the hot air guide pipe is not overheated and the waste water is heated and evaporated into the waste water. In particular, a screen is installed at the bottom of the hot air guide pipe, and hot air emitted from the hot air guide pipe passes through the screen so that the hot air splits into fine air bubbles while passing through the screen, thereby expanding the contact area of the hot air air to the wastewater. Of course, the air bubbles stay in water for a long time and bubbles are not generated on the water surface, so that heat exchange efficiency is high and rapid evaporation can be achieved.

Description

Apparatus for evaporating and concentrating waste water by direct heating}

The present invention relates to a wastewater treatment apparatus for condensing sludge mixed with wastewater by heating and evaporating wastewater contained in a tank with hot air, and more particularly, by installing a separate cooling means in a hot wind guide pipe through which hot air passes. The present invention relates to a direct heating wastewater evaporative concentrator configured to refine air bubbles of hot air.

There are many ways to treat the wastewater, and one of them is to heat the wastewater to leave sludge but to incinerate the sludge or to dry it and landfill it.

In order to evaporate and leave sludge in the wastewater, the wastewater is first heated. Conventionally, a steam or hot water circulating boiler was used for the above process. That is, the wastewater was heated by allowing steam or hot water to flow around the pipe through which the wastewater flows internally.

However, the method of heating the waste water by the boiler as described above is indirect heating method is not so high thermal efficiency. In particular, various harmful substances mixed in the waste water rapidly corrode the pipe or accumulate scale on the inner wall of the pipe. If the scale builds up gradually in the pipe, it will eventually become clogged, making the device unusable. Therefore, the waste water treatment apparatus of the indirect heating method as described above requires a lot of maintenance costs from time to time.

According to the inconvenience, a direct heating wastewater evaporation concentrator has been proposed to heat and evaporate wastewater by directly contacting hot air with the wastewater. The direct heating wastewater evaporation concentrator is a device configured to leave sludge but by heating and evaporating wastewater by spraying air heated to ultra high temperature in the water of the wastewater.

Figure 1 schematically shows a conventional direct heating wastewater evaporation concentrator.

As shown, the conventional evaporation concentrator 10 is an evaporation concentration tank 13 for storing the wastewater supplied from the outside, and is installed vertically on the upper portion of the evaporation concentration tank 13, the lower end of the evaporation concentration tank 13 It includes a hot air supply unit 17 is inserted into the upper end and the combustion chamber 12 is provided.

The evaporative concentration tank 13 is provided with a steam outlet 32, a circulating wastewater inlet 36, 38, a liquefied water inlet 42 and a sludge outlet 40.

The bottom surface of the evaporation concentration tank 13 is inclined downward toward the center portion so that the sludge sinking to the bottom can be easily slipped to the sludge discharge port 40.

The steam outlet 32 is a passage through which vapor evaporated from the waste water exits and is usually connected to a demister (not shown). The demister is a device that filters water from steam mixed with water, and the filtered water is returned to the evaporation tank 13 through the liquefied water inlet 42. The wastewater inlet 34 is a passage through which wastewater is supplied from the outside.

The circulating wastewater inlet 38 is a passage provided at the side of the evaporative concentration tank 13 together with the circulating wastewater outlet 36. A wastewater circulation pump 28 is installed between the circulation wastewater outlet 36 and the circulation wastewater inlet 38. When the waste water circulation pump 28 operates, the waste water is discharged from the circulating waste water outlet 36 and moved to the circulating waste water inlet 38.

The hot air guide mechanism 26 and the waste water spraying mechanism 30 are installed inside the evaporation concentration tank 13.

The hot air guide mechanism 26 is a cylindrical structure supported on the bottom surface of the evaporation concentration tank 13 and is located below the vertical portion of the hot air supply unit 17. The hot air guide mechanism 26 includes a horizontal blocking plate 48 horizontally positioned with a through hole 46 in the center and a cylindrical blocking wall 44 fixed to an upper portion of the horizontal blocking plate 48. Is done.

The hot air guide mechanism 26 properly guides the flow of hot air emitted from the lower end of the hot air supply unit 17 so that the waste water does not rumble excessively, and also supports the sludge in which the hot air is settled at the bottom of the evaporation concentration tank 13. Do not let it.

The waste water injection mechanism 30 is located on the upper surface of the waste water and sprays water onto the waste water to take the form of a ring, and a plurality of nozzles 31 are installed on the bottom thereof. The nozzle 31 sprays the wastewater press-fitted through the circulating wastewater inlet 38 to the bottom.

On the other hand, the hot air supply unit 17 is composed of a hot air guide pipe 22, the outer peripheral surface of which is surrounded by the fire wall 20, and the combustion chamber 12 provided on the hot air guide pipe 22. The combustion chamber 12 includes a fuel nozzle 16 for injecting fuel and a torch 18 for ignition as a space for heating the high-pressure air introduced from the outside through the air inlet 14.

The hot air guide pipe 22 passes through the combustion chamber 12 and guides the heated hot air into the wastewater in the evaporation concentration tank 13. A plurality of hot air blowing holes 24 are formed at the lower end of the hot air guide pipe 22. The hot air blowing holes 24 blow hot air in a radial direction while being locked in the lower surface of the waste water.

The refractory wall 20 is formed by stacking a known castable or refractory brick and wraps the hot air guide pipe 22 which is heated at a high temperature.

By the way, since the refractory wall 20 has a masonry structure composed of refractory bricks or castas, the lifespan is shortened by frequent cooling and heating, and thus, frequent repairs are required, and structural durability is also weak.

In addition, there is a limit that hot air blown out to the lower end of the hot air guide pipe 22 does not effectively exchange heat with the waste water. As known in the art, heat exchange is better performed as the contact area between the heat generating portion and the heat absorbing portion is wider. The hot air blown out from the hot air guide pipe 22 has a large stream line, so the air bubbles are large. This is because the heat exchange area between the droplets and the wastewater is small.

In addition, the larger the air bubbles, the faster the time to float on the surface of the water.

The present invention has been made to solve the above problems, and the hot air guide pipe that is heated by passing the hot air is cooled by circulating the waste water in the evaporation tank so that the hot air guide pipe is not overheated and the waste water is heated and evaporated into the waste water. In particular, by installing a screen at the bottom of the hot air guide pipe and directing the hot air emitted from the hot air guide pipe to pass through the screen, the hot air is split into fine air bubbles while passing through the screen, thereby contacting the hot air with the waste water. In addition, the purpose of the present invention is to provide a direct heat type wastewater evaporation concentrator configured to have a long time for air bubbles to stay in the water and foaming on the water surface so that heat exchange efficiency is high and rapid evaporation can be achieved.

1 is a block diagram showing a conventional direct heating wastewater evaporation concentrator.

Figure 2 is a block diagram showing a direct heating wastewater evaporation and concentration apparatus according to an embodiment of the present invention.

Figure 3 is an exploded perspective view showing a part of the hot air guide mechanism in the direct heating type wastewater evaporation concentrator according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10,50: wastewater evaporator 12: combustion chamber

13: Evaporation concentration tank 14: Air pressure inlet

16: Fuel nozzle 17, 78: Hot air supply unit

18: Tochigi 20: fireproof wall

22: Hot air guide pipe 24: Hot air jet hole

26, 58: hot air guide mechanism 28: waste water circulation pump

30: wastewater injection mechanism 31: nozzle

32: steam outlet 34: wastewater inlet

36: circulating wastewater inlet 38: circulating wastewater inlet

40: sludge outlet 42: liquefied water inlet

44, 60: blocking wall 46: through hole

48, 76: horizontal blocking plate 52: outer pipe

54: wastewater spray nozzle 56: pump

62, 64: support jaw 66: first screen

68: second screen 74: pipe through hole

80: interspace 82: gap

84,86,88,90: Supporting jaw 92: Third screen

94: fourth screen

In order to achieve the above object, the present invention, the evaporation concentration tank which receives and stores the waste water supplied from the outside and the evaporation and concentration of the waste water therein, and the high pressure injected by the blower as installed on the evaporation concentration tank Hot air supply unit for heating and evaporating waste water by heating the air, and installed inside the evaporation tank, and guides the flow of hot air sprayed into the water through the hot air supply unit to prevent the flotation of precipitates In the direct heating type wastewater evaporation and concentration apparatus having a hot air guide mechanism, The hot air supply unit; A combustion chamber for heating the high pressure air supplied from the outside and moving to the lower portion, and a lower end thereof extends below the surface of the wastewater in the evaporative concentration tank so as to spray hot air heated in the wastewater through the combustion chamber. And a hot air guide pipe having a plurality of hot air ejection holes in a radial direction at a lower end located below the surface of the water, wrapped around the hot air guide pipe, and spaced apart from an outer circumferential surface of the hot air guide pipe to form an interspace therebetween. And an outer nozzle extending inwardly, and an injection nozzle provided in a space between the hot air guide pipe and the outer pipe and spraying the wastewater pumped from the evaporation concentration tank toward the hot air guide pipe to cool the hot air guide pipe.

In addition, the hot air guide mechanism; A horizontal blocker plate horizontally spaced apart from the bottom surface of the evaporative concentration tank, and installed at an upper portion of the horizontal blocker plate to accommodate a lower end portion of the hot air guide pipe therein, and the flow of hot air blown out through the hot air jet hole; And a cylindrical blocking wall blocking the inner wall surface, and at least one screen installed at an upper portion of the horizontal blocking plate and passing the hot air blown out through the hot air guide pipe to refine the air bubbles of the hot air.

In addition, the screen is positioned horizontally on the upper portion of the horizontal shielding plate, the first screen and the second screen which is positioned horizontally on the upper portion of the hot air blowing hole by passing the lower end of the hot air guide pipe to the center portion further provided It features.

In addition, the first and second screens are supported by the inner wall surface of the blocking wall is installed, characterized in that detachable to the blocking wall.

In addition, at least one screen is further included in water between the outer circumferential surface of the barrier wall and the inner circumferential surface of the evaporative condensation tank.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a block diagram showing a direct heating wastewater evaporation and concentration apparatus according to an embodiment of the present invention.

As shown, the direct heating type wastewater evaporative concentrating device 50 according to the present embodiment includes a hot air supply unit 78 having an outer pipe 52 and a plurality of wastewater spray nozzles 54, and the hot air supply unit ( The evaporative condensation tank 13 located in the lower portion of the 78 and receiving waste water therein, and the hot air guide mechanism 58 installed in the evaporative condensation tank 13 and supporting the screens 66, 68, 92 and 94. It is configured to include).

The hot air supply unit 78 is installed vertically on the upper portion of the evaporation concentration tank 13, the lower end portion of the hot air guide pipe 22 is located submerged in the water in the evaporation concentration tank 13, and the upper end of the hot air guide pipe 22 The outer chamber 52 which surrounds the combustion chamber 12 and the hot air guide pipe 22, the lower end of which extends into the evaporation tank 13, and a plurality of inner pipes 52 installed inside the outer pipe 52. It consists of a waste water spray nozzle (54).

The outer pipe 52 is a metal pipe surrounding the hot air guide pipe 22, and an inner wall thereof is spaced apart from an outer circumferential surface of the hot air guide pipe 22 to form an interspace 80. The interspace 80 serves as a heat insulating layer so that the heat of the hot wind guide pipe 80 in a heated state is hardly transmitted to the outside of the outer pipe 52 even without a fireproof wall.

The waste water spray nozzle 54 is installed on the inner wall surface of the upper end of the outer pipe 52 and sprays the waste water to the hot air guide pipe 22. The injected waste water cools the hot air guide pipe 22 heated by the hot air. As is well known, since the hot air guide pipe 22 is heated to 1000 ° C. or more by hot air passing through the inside thereof, the hot air guide pipe 22 may cause corrosion or deformation by heat. Thus, cooling wastewater is injected into the hot air guide pipe 22. This prevents the hot air guide pipe 22 from overheating.

The wastewater sprayed on the hot air guide pipe 22 moves downward through the outer wall of the hot air guide pipe 22 to perform cooling, and is gradually heated to be returned to the evaporation concentration tank 13. The number of installation of the wastewater spray nozzle 54 depends on the size of the wastewater evaporation concentrator 50 and is installed at a predetermined interval on the inner wall surface of the outer pipe 52.

As described above, the lower end of the outer pipe 52 extends into the evaporation condensation tank 13, and the contact portion between the outer pipe 52 and the evaporation condensation tank 13 is sealed by welding or bolting coupling.

On the other hand, the hot air guide mechanism 58, like the conventional hot air guide mechanism (26 in Fig. 1) basically guides the sprinkling line of the hot air to prevent the waste water from excessively swell by the hot air or is deposited on the floor Do not let the sludge float up. However, four screens 66, 68.92, 94 are supported by the hot air guide mechanism 58 of the present embodiment.

The hot air guide mechanism 58 according to the present embodiment includes a horizontal blocking plate 48 having a horizontal arrangement and a through hole 46 formed at the center thereof, and a cylindrical blocking wall provided on an upper portion of the horizontal blocking plate 48. 60, first and second screens 68 and 66 horizontally installed inside the blocking wall 60, and third supported on the inner wall surface of the blocking wall 60 and the evaporative condensation tank 13; And four screens 92 and 94.

The horizontal blocking plate 48 is provided so that hot air emitted from the hot air guide pipe 22 does not reach the bottom plate of the evaporative condensation tank 13. The formation of the through hole 46 in the center of the horizontal blocking plate 48 allows the waste water below to be heated by allowing a minimum of hot air to pass through so as not to support the sludge.

Two support jaws 62 and 64 are fixed to the inner circumferential surface of the barrier wall 60. The support jaws 62 and 64 protrude from the inner circumferential surface of the blocking wall 60 and horizontally support the disk-shaped screens 66 and 68.

The two support jaws 62 and 64 are parallel to each other and are fixed at a position relatively higher than the hot air blow holes 24. Therefore, the first screen 66 over the upper support jaw 62 and the second screen 68 supported over the lower support jaw 64 pass the hot air guide pipe 22 to the center thereof, and the hot air blowout holes ( 24) is located at the top.

Two support jaws 84 and 86 protrude from the outer circumferential surface of the barrier wall 60, and two support jaws 88 corresponding to the support jaws 84 and 86 are also formed on the inner circumferential surface of the evaporation tank 13. 90) is formed. The third screen 92 and the fourth screen 94 are supported on the support jaw. The third screen 92 spans the support jaw 84, 86, and the fourth screen 94 spans the support jaw 86, 90. In some embodiments, the third and fourth screens may not be applied.

Each of the screens 68, 66, 92, and 94 has a mesh structure of 5 meshes to 10 meshes, and is preferably made of stainless steel.

Eventually, the air masses of hot air blown out from the hot air guide pipe 22 are chopped while passing through any one of the screens 68, 66, 92, and 94. If the bubble is large, the contact area between the bubble and the water is smaller than the size of the bubble and the time that the bubble floats on the surface is short. (92,94) passes through the hot air and makes the air bubbles fine, thereby greatly increasing the contact area between the hot air air and the waste water, that is, the heat exchange area. Since air bubbles have a fine size, air bubbles may float on the surface of the water for a long time, and thus heat exchange may be performed with sufficient time.

Figure 3 is an exploded perspective view showing a part of the hot air guide mechanism in the direct heating type wastewater evaporation and concentration apparatus according to an embodiment of the present invention.

As shown, two support jaws 62, 64, 84, and 86 are provided on the inner and outer circumferential surfaces of the barrier wall 60, respectively. As described above, each support jaw 62, 64, 84, 86 supports the screens 68, 66, 92, 94 horizontally.

The first and second screens 66 and 68 installed in the inner region of the barrier wall 60 are installed at a predetermined height above the horizontal blocking plate 76 and have a pipe through-hole 74 at the center thereof to provide hot air guides. Pass the pipe 22. The inner circumferential surface of the pipe through hole 74 and the outer circumferential surface of the hot air guide pipe 22 are in close contact with each other but are not coupled to each other.

The first and second screens 68 and 66 mounted on the support jaws 62 and 64 and the respective support jaws 62 and 64 are not coupled to each other. This is to remove only the screen (68, 66) from the hot air guide mechanism 58, if necessary to be able to clean.

The third and fourth screens 92 and 94 provided on the outer side of the barrier wall 60 are also parallel to each other and spaced apart from the upper portion of the horizontal blocking plate 76 by a predetermined distance. The inner edges of the third and fourth screens 92 and 94 are seated on the locking projections 84 and 86, and the outer edges of the third and fourth screens 92 and 94 are supported by the locking projections 88 and 90 of the inner wall of the evaporative condensation tank 13.

The first, second, third, and fourth screens 68, 66, 94, and 96 may be installed in the hot air guide mechanism 58 as long as they are not coupled to each other. Of course.

Operation of the direct heating wastewater evaporation concentrator of the present invention made as described above is made as follows.

First, the wastewater supply pump P is operated to supply the wastewater stored in the wastewater tank T to the evaporation concentration tank 13 through the wastewater inlet 34. The water level of the wastewater supplied to the evaporation concentration tank 13 is maintained to be higher than the height of the hot air jet hole 24.

When the supply of waste water is completed, high pressure air is supplied into the combustion chamber 12, fuel is supplied to the fuel nozzle 16, and at the same time, the torch 18 is ignited to generate hot air and blown downward through the hot air guide pipe 22. Let's do it.

The hot air blown out from the hot air guide pipe 22 moves in the water of the wastewater and passes through the first and second screens 68 and 66. In the meantime, the air mass of hot air is turned into fine hot air bubbles and gradually rises to the surface while performing heat exchange with waste water.

As the wastewater is heated by hot air, the vapor evaporating from the wastewater exits through the steam outlet 32. Since the steam discharged to the outside has moisture, a separate demister (not shown) is installed on the side of the evaporation tank 13 to filter the moisture from the evaporation air and return it to the evaporation tank 13 through the liquefied water inlet 42. . If the demister is not installed, the liquefied water inlet 42 will be unnecessary.

As described above, the pump 56 is continuously operated while the hot air is applied to allow the waste water to be discharged through the nozzle 31 of the waste water injection mechanism 30. Wastewater ejected from the nozzle 31 bursts bubbles that may be generated on the surface of the wastewater to prevent evaporation from being blocked by the bubbles.

In addition, in order to prevent the hot air guide pipe 22 from being overheated by the continuous operation, the waste water spray nozzle 54 sprays the waste water on the hot air guide pipe 22.

The waste water spray nozzle 54 receives wastewater in the evaporation concentration tank 13 by the operation of the pump 56 and sprays it on the outer circumferential surface of the hot air guide pipe 22 so that the wastewater serves as the cooling water. The wastewater cooling the hot air guide pipe 22 moves downward through the outer circumferential surface of the hot air guide pipe 22 by gravity and is gradually heated, and then some evaporates and returns to the evaporation concentration tank 13. As such, the waste water cools the hot air guide pipe 22 and is heated or evaporated, thereby reducing the fuel cost and cooling.

As the hot air is continuously supplied as described above, the wastewater in the evaporation tank 13 evaporates gradually, leaving sludge. The sludge remaining in the evaporation concentration tank 13 is removed and treated through the sludge discharge port 40.

As mentioned above, although this invention was demonstrated in detail through the specific Example, this invention is not limited to the said Example, A various deformation | transformation is possible for a person with ordinary knowledge within the scope of the technical idea of this invention.

The direct heating wastewater evaporation concentrator of the present invention made as described above circulates the wastewater in the evaporation tank to cool the hot wind guide pipe through which the hot air passes, so that the hot wind guide pipe is not overheated and the wastewater is heated or evaporated into the wastewater. Has In particular, a screen is installed at the bottom of the hot air guide pipe, and hot air emitted from the hot air guide pipe passes through the screen so that the hot air splits into fine air bubbles while passing through the screen, thereby expanding the contact area of the hot air air to the wastewater. Of course, the air bubbles stay in water for a long time and bubbles are not generated on the water surface, so that heat exchange efficiency is high and rapid evaporation can be achieved.

Claims (5)

An evaporation concentration tank which receives and stores the wastewater supplied from the outside and evaporates and concentrates the wastewater therein; A combustion chamber installed at the upper portion of the evaporation concentration tank for heating the high pressure air injected by the blower, and a lower end thereof so as to spray hot air installed in the lower portion of the combustion chamber and heated through the combustion chamber in the waste water. A hot air supply unit having a hot air guide pipe extending below the water surface of the wastewater and positioned below the water surface and having a plurality of hot air ejection holes in a radial direction; It is installed inside the evaporation tank to guide the flow of hot air is injected into the water through the hot air supply unit to prevent the flotation of the sediment, horizontal blocker plate is installed horizontally spaced apart from the bottom of the evaporation tank, The hot wind guide mechanism is installed above the horizontal blocking plate to receive a lower end of the hot air guide pipe therein and has a hot air guide mechanism including a cylindrical blocking wall for blocking the flow of hot air blown out through the hot air blowing holes to its inner wall surface. In the heated wastewater evaporation concentrator, The outer portion of the hot air guide pipe 22 is wrapped around the hot air guide pipe 22 and spaced apart from the outer circumferential surface of the hot air guide pipe 22 to form an interspace 80 between the hot air guide pipe 22 and the lower end of the evaporative concentration tank. (13) an outer pipe 52 extending inwardly, It is provided in the space 80 between the hot air guide pipe 22 and the outer pipe 52 and sprays the waste water pumped from the evaporation concentration tank 13 toward the hot air guide pipe 22 to cool the hot air guide pipe 22. Injection nozzle 54 is provided, The hot air guide mechanism includes a at least one screen installed on an upper portion of the horizontal blocking plate and including at least one screen to pass the hot air blown out through the hot air guide pipe 22 to refine the air bubbles of the hot air air. Wastewater Evaporation Concentrator. delete The method of claim 1, The screen is positioned horizontally above the horizontal blocking plate 48, and the first screen 66 is positioned horizontally above the hot air jet hole 24 by passing the lower end of the hot air guide pipe 22 to the center thereof. And a second screen (68) is further provided, characterized in that the direct heating wastewater evaporation and concentration. The method of claim 3, wherein The first and second screens (66, 68) is directly supported on the inner wall surface of the barrier wall is installed, but the removable heat evaporation concentrating device, characterized in that detachable to the barrier wall. The method of claim 4, wherein And at least one screen is further included in water between the outer circumferential surface of the barrier wall and the inner circumferential surface of the evaporative condensation tank.