High-efficiency atomization evaporation tower

Abstract

The application discloses a high-efficiency atomization evaporation tower, which is internally provided with a liquid uniform distributor and an atomization disc. The atomization disc is connected with a motor. An inlet pipe is arranged above the liquid uniform distributor and used for feeding high-salinity wastewater. The liquid uniform distributor comprises a groove structure and an overflow weir arranged on one side of the groove structure. A plurality of flow distribution plates are arranged on the atomization disc. A plurality of guide vanes are arranged at the circumference of the atomization disc. A hot air inlet is arranged at the top of the evaporation tower. A hot air outlet is arranged in the evaporation tower and communicated with the hot air inlet. The hot air outlet comprises a central hot air outlet arranged around the liquid inlet bin and a circumferential hot air outlet arranged in the evaporation tower and close to the side wall of the evaporation tower. The evaporation tower is provided with a material outlet at the bottom. The structure of the atomization evaporation tower is improved, the atomization effect of the material liquid is improved, the heat exchange efficiency of the material liquid and the hot air is improved, and the evaporation effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater treatment, and particularly relates to a high-efficiency atomization evaporation tower. BACKGROUND

[0002] Zero discharge of high-salinity wastewater is an important issue in the fields of resources and environmental protection. At present, most wastewater zero discharge processes usually first perform pretreatment, and then recover water through thermal evaporation or membrane concentration. However, there are limitations such as high energy consumption, easy scaling, low concentration rate, high cost and the like. The spray evaporation technology is usually used in the food and pharmaceutical industries, and is now creatively used for the treatment of high-salinity wastewater. The principle is to atomize the feed liquid to increase the specific surface area, and to realize drying and desalination by contacting with hot air. The working process of the spray evaporation technology mainly includes four stages, i.e., atomization by a rotary atomizer, mixing and flowing of the feed mist and the evaporation medium (hot air), evaporation of the feed mist, and finally separation and recovery of the product. The operation of each stage is related to the design and operation of the spray evaporation tower, which together with the physicochemical properties of the feed liquid determines the atomization and evaporation effect.

[0003] The existing spray evaporation technology has the problems of uneven particle size and distribution of the atomized feed liquid, insufficient heat and mass transfer between the misted feed liquid and the hot air, and poor atomization effect. In addition, the atomization disc may throw the material on the tower wall, causing wall sticking, which needs regular manual maintenance, and thus the application is limited. In the traditional evaporation tower, the hot air is directly blown into the tower at the hot air inlet, and the hot air flow field in the tower is relatively turbulent, which is not conducive to the sufficient heat and mass transfer between the hot air and the misted material. In addition, the particle size of the powdery material after atomization and drying is small, and the texture is light, and the outlet of the traditional evaporation tower is a straight pipe directly connected to the cylinder, and the outlet is not protected, which easily leads to the fact that the dried material is blown out of the cylinder by the hot air

[0004] In summary, the problems in the practical application of the spray evaporation technology can be summarized as follows:

[0005] 1) The feed liquid distribution of the atomization disc is uneven, which affects the uniformity of atomization and the size of the mist droplets, and reduces the drying effect;

[0006] 2) The spray distance of the atomization disc is too large when rotating at a high speed, which may throw the material on the tower wall, causing wall sticking;

[0007] 3) The hot air distribution at the hot air inlet of the evaporation tower is uneven, and the hot air flow field in the tower is turbulent, so the hot air cannot fully contact with the misted feed liquid for heat and mass transfer, and the efficiency is low;

[0008] 4) The powdery material after atomization and drying is easily blown out of the tower by the hot air. SUMMARY

[0009] The technical problem solved by the present application is: in order to solve the above-mentioned deficiencies existing in the prior art, the present application provides a high-efficiency atomization evaporation tower, which improves the structure of the atomization evaporation tower, improves the atomization effect of the liquid, and further improves the heat exchange efficiency of the liquid and hot air, and improves the evaporation effect.

[0010] The technical solution adopted by the present application to solve its technical problem is: a high-efficiency atomization evaporation tower, characterized in that a liquid uniform distributor and an atomization disc are arranged in the evaporation tower, the atomization disc is located below the liquid uniform distributor, the atomization disc is connected with a motor, an inlet pipe is arranged above the liquid uniform distributor for introducing high-salinity wastewater, the liquid uniform distributor comprises a groove structure and an overflow weir arranged on one side of the groove structure, a plurality of flow dividing plates are arranged on the atomization disc, and a plurality of guide vanes are arranged at the circumference of the atomization disc.

[0011] A hot air inlet is arranged at the top of the evaporation tower, and a hot air outlet is arranged in the evaporation tower and communicates with the hot air inlet, the hot air outlet comprises a central hot air outlet arranged around the liquid inlet bin and a circumferential hot air outlet arranged in the evaporation tower and close to the side wall of the evaporation tower.

[0012] The bottom of the evaporation tower is provided with a material outlet.

[0013] Further, a comb-shaped tooth is arranged at the lower part of the overflow weir for dividing and guiding the flowing high-salinity wastewater.

[0014] Further, arc-shaped guide grooves are formed between the guide vanes around the atomization disc, and the high-salinity wastewater in the atomization disc is thrown out of the arc-shaped guide grooves when the atomization disc rotates.

[0015] Further, the central hot air outlet is annularly arranged above the atomization disc, the central hot air outlet has at least two and is arranged at different heights, and the central hot air outlet is designed in an inverted conical shape.

[0016] Further, a circular distributor is arranged at the top of the evaporation tower, a spiral-shaped air inlet guide plate is arranged in the distributor, the hot air inlet is arranged on the distributor and located at the tangent position of the distributor, the air inlet of the hot air inlet is designed as a rectangular port and a tapered air duct, and inclined hot air guide plates are arranged in the central hot air outlet and the circumferential hot air outlet, so that the air outlets of the central hot air outlet and the circumferential hot air outlet are spiral-shaped.

[0017] Further, the rotation directions of the air outlets of the central hot air outlet and the circumferential hot air outlet are opposite to the rotation direction of the atomization disc.

[0018] Further, the motor is arranged above the distributor and connected with the atomization disc through a rotating shaft.

[0019] Further, the bottom of the evaporation tower is inverted conical and tapered to the material outlet, a gas collecting ring is arranged at a position below the atomizing disc in the evaporation tower, the gas collecting ring is horizontally arranged, an opening is arranged on the gas collecting ring, the opening on the gas collecting ring is arranged at the bottom of the gas collecting ring or the inner side obliquely downward, a metal filter screen is arranged at the opening, and a hot air outlet extending to the outside of the evaporation tower is connected to the gas collecting ring.

[0020] Further, the side of the evaporation tower is provided with an observation window.

[0021] Further, the outside of the evaporation tower is provided with a support.

[0022] The beneficial effects of the present application are:

[0023] (1) The liquid uniform distributor is arranged, and the shunt plate structure is arranged on the atomizing disc, the material enters the liquid uniform distributor from the inlet pipe first, then uniformly overflows from the overflow weir (which has the functions of maintaining the liquid ring and uniformly overflowing the liquid) around the liquid uniform distributor, and then uniformly drips or flows into the shunt cavity of the atomizing disc from the comb-shaped tooth structure below the overflow weir; the material enters the shunt cavity and is uniformly scattered along the outside circumference of the shunt cavity under the action of the centrifugal force, is cut and distributed into the arc-shaped flow guide groove from the end of the flow guide vane, and is uniformly thrown out along the arc-shaped flow guide groove under the action of the high-speed rotating centrifugal force of the atomizing disc, so that the material dispersion uniformity is improved.

[0024] (2) The hot air inlet is provided with a spiral flow guide plate, the distributor shell is designed as a spiral volute, the inside is hollow circular, and the rotary atomizer is installed in the middle; the air duct inlet is designed as a rectangular port to ensure sufficient air intake, and is designed as a tapered air duct, so that the conical annular wind speed dynamic pressure is balanced, and the air intake is uniform; the central hot air outlet is conical in structure and is divided into two layers, and both layers are provided with hot air flow guide plates; the hot air flows in the air duct provided with the flow guide plates, finally enters the evaporation tower in the form of spiral wind, and the air outlet direction is opposite to the rotating direction of the atomizing disc, so that the liquid phase and the gas phase are countercurrent, the high-speed hot air further breaks the mist droplets, and the heat and mass transfer between the hot air and the mist material are facilitated, and the evaporation is accelerated; a circle of circumferential hot air outlets is distributed around the cylinder wall at the top of the evaporation tower, the hot air blows from the periphery to the middle, so that the flow field in the evaporation tower is in a circular flow, the evaporation is accelerated, and the material sticking to the wall phenomenon is reduced;

[0025] (3) The evaporation tower lower part air outlet is provided with a gas collecting ring, the gas collecting ring opening is downward and provided with a metal filter screen, so that the dried material is prevented from being blown out of the air outlet, and the hot air is collected by the gas collecting ring and then discharged out of the evaporation tower. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0027] Figure 2 It is a schematic diagram of the internal structure of the present application;

[0028] Figure 3 is a schematic diagram of the liquid uniform distributor and the atomizing disc structure in the application;

[0029] Figure 4 is Figure 3 is an enlarged view of A in the figure.

[0030] In the figure, 100, liquid uniform distributor; 101, groove structure; 102, overflow weir; 103, comb-shaped teeth; 200, atomizing disc; 201, flow dividing plate; 202, guide vane; 203, arc-shaped guide groove; 300, distributor; 301, hot air inlet; 302, central hot air outlet; 303, circumferential hot air outlet; 304, air inlet guide plate; 305, hot air guide plate; 400, material outlet; 500, air collecting ring; 501, hot air outlet; 600, observation window; 700, support; 800, motor; 900, inlet pipe. Embodiment

[0031] The specific embodiments of the application are described in detail below with reference to the accompanying drawings. Embodiment

[0032] Reference Figures 1-4 A high-efficiency atomizing evaporation tower, an evaporation tower is provided with a liquid uniform distributor 100 and an atomizing disc 200, the atomizing disc 200 is located below the liquid uniform distributor 100, and the atomizing disc 200 is connected with a motor 800. An inlet pipe 900 is arranged above the liquid uniform distributor 100 for feeding in high-salinity wastewater, the liquid uniform distributor 100 comprises a groove structure 101 and an overflow weir 102 arranged on one side of the groove structure 101, and comb-shaped teeth 103 are arranged at the downstream of the overflow weir 102 for dividing and guiding the flowing high-salinity wastewater.

[0033] A plurality of flow dividing plates 201 are arranged on the atomizing disc 200, the flow dividing plates 201 divide the space above the atomizing disc 200 into a plurality of flow dividing cavity structures, a plurality of guide vanes 202 are arranged at the circumference of the atomizing disc 200, and the guide vanes 202 are arc-shaped. The guide vanes 202 around the atomizing disc 200 form arc-shaped guide grooves 203, and the high-salinity wastewater in the atomizing disc 200 is thrown out from the arc-shaped guide grooves 203 when the atomizing disc 200 rotates.

[0034] The liquid uniform distributor 100 and the shunt plate 201 structure on the atomizing disc 200 are arranged, the material is first introduced into the liquid uniform distributor 100 from the inlet pipe 900, then uniformly overflows from the overflow weir 102 (with the function of maintaining the liquid ring and making the liquid overflow uniformly) around the liquid uniform distributor 100, and uniformly drops or flows into the shunt cavity of the atomizing disc 200 from the structure of the comb-shaped teeth 103 below the overflow weir 102; the material enters the shunt cavity and is uniformly scattered along the outside circumference of the shunt cavity under the action of the centrifugal force, is cut and distributed into the arc-shaped flow guide groove 203 from the end of the flow guide blade 202, and under the action of the high-speed rotation centrifugal force of the atomizing disc 200, the material liquid is uniformly thrown out along the arc-shaped flow guide groove 203, so that the material dispersion uniformity is improved.

[0035] The top of the evaporation tower is provided with a hot air inlet 301, and the evaporation tower is provided with a hot air outlet communicated with the hot air inlet 301, the hot air outlet includes a central hot air outlet 302 arranged around the liquid inlet bin and a circumferential hot air outlet 303 arranged close to the side wall of the evaporation tower in the evaporation tower. The top of the evaporation tower is provided with a circular distributor 300, the distributor 300 is provided with a spiral air inlet guide plate 304, the hot air inlet 301 is arranged on the distributor 300 and located at the tangent position of the distributor 300, the air inlet of the hot air inlet 301 is arranged as a rectangular port and designed as a tapered air duct; the central hot air outlet 302 and the circumferential hot air outlet 303 are both provided with an inclined hot air guide plate 305, so that the air outlet of the central hot air outlet 302 and the circumferential hot air outlet 303 is spiral.

[0036] The central hot air outlet 302 is annularly arranged above the atomizing disc 200, the central hot air outlet 302 has at least two and is arranged at different heights, and the central hot air outlet 302 is designed as an inverted cone. The air outlet rotation directions of the central hot air outlet 302 and the circumferential hot air outlet 303 are opposite to the rotation direction of the atomizing disc 200.

[0037] The air inlet guide plate 304 at the hot air inlet 301 is spiral, the shell of the distributor 300 is designed as a spiral volute, the inside is hollow circular, and the rotary atomizer is installed in the middle; the air inlet is arranged as a rectangular port to ensure sufficient air inlet amount, and is designed as a tapered air duct, so that the conical annular wind speed dynamic pressure is balanced, and the air inlet is uniform; the central hot air outlet 302 is conical structure and is divided into inner and outer two layers, both of which are provided with hot air guide plates 305, the hot air flows in the air duct provided with the guide plate, finally enters the evaporation tower as spiral wind, and the air outlet direction is opposite to the rotation direction of the atomizing disc 200, so that the liquid phase and the gas phase are countercurrent, the high-speed hot air further breaks the mist droplets, and is beneficial to the sufficient heat and mass transfer between the hot air and the mist material, and accelerates evaporation; a circumferential hot air outlet 303 is distributed around the cylinder wall at the top of the evaporation tower, the hot air blows from the periphery to the middle, so that the flow field in the evaporation tower is circular, the evaporation is accelerated, and the material wall sticking phenomenon is reduced.

[0038] The bottom of the evaporation tower has a material outlet 400, the bottom of the evaporation tower is inverted conical and tapers to the material outlet 400, a gas collecting ring 500 is arranged in the evaporation tower at a position below the atomizing disc 200, the gas collecting ring 500 is horizontally arranged, the gas collecting ring 500 is provided with an opening, the opening of the gas collecting ring 500 is arranged at the bottom of the gas collecting ring 500 or the inner side of the gas collecting ring 500 is arranged obliquely downward, a metal filter screen is arranged at the opening, and the gas collecting ring 500 is connected with a hot air outlet 501 extending to the outside of the evaporation tower. The gas collecting ring 500 is arranged at the air outlet of the lower part of the evaporation tower, the opening of the gas collecting ring 500 is downward and the metal filter screen is arranged, so that the dried material can be prevented from being blown out of the air outlet, and the hot air is collected by the gas collecting ring 500 and then discharged out of the evaporation tower.

[0039] An observation window 600 is arranged on the side of the evaporation tower, and a support 700 is arranged on the outside of the evaporation tower and used for mounting the evaporation tower.

[0040] The working process of the evaporation tower in the atomizing drying of high-salinity wastewater is as follows: the high-salinity wastewater is input into the liquid uniform distributor 100 in the evaporation tower through the inlet pipe 900, and then uniformly dispersed into the atomizing disc 200 through the liquid uniform distributor 100. The rotating atomizing disc 200 is driven by the motor 800 to rotate at a high speed, and the liquid is broken into small droplets under the action of multiple forces. The evaporation medium used in the evaporation chamber is hot air. The hot air enters from the hot air inlet 301, generates a rotational flow after passing through the volute section, changes the speed direction through the flow guide plate flow channel of the distributor 300 with an inclined angle, and then spirally enters the evaporation tower after being guided by the hot air flow guide plate 305. The hot air meets the atomized droplets of the high-salinity wastewater, and the two perform strong heat and mass transfer, the water in the droplets is rapidly evaporated, and the powdery material is separated out. Finally, under the action of gravity and airflow, the powdery material is discharged from the material outlet 400 at the bottom of the evaporation chamber.

[0041] The above only describes the preferred embodiments of the present application, and it should be noted that, for those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application.

Claims

1. A high-efficiency atomizing evaporation tower, characterized in that, The evaporation tower is equipped with a liquid distributor (100) and an atomizing disc (200). The atomizing disc (200) is located below the liquid distributor (100) and is connected to a motor (800). An inlet pipe (900) is provided above the liquid distributor (100) for introducing high-salt wastewater. The liquid distributor (100) includes a groove structure (101) and an overflow weir (102) located on one side of the groove structure (101). The downstream end of the overflow weir (102) is provided with comb-like teeth (103) for regulating the downstream flow. High-salt wastewater is divided and guided. The atomizing disk (200) is provided with several diversion plates (201). The diversion plates (201) divide the space above the atomizing disk (200) into several diversion chamber structures. The material first enters the liquid uniform distributor (100) through the inlet pipe (900), and then overflows evenly from the overflow weir (102) around the liquid uniform distributor (100). It then drips evenly or flows into the diversion chamber of the atomizing disk (200) through the comb-shaped tooth (103) structure below the overflow weir (102). Several guide vanes (202) are provided on the circumference of the atomizing disk (200). The top of the evaporator is provided with a hot air inlet (301), and the evaporator is provided with a hot air outlet connected to the hot air inlet (301). The hot air outlet includes a central hot air outlet (302) located around the liquid inlet and a circumferential hot air outlet (303) located inside the evaporator near the side wall of the evaporator. The bottom of the evaporator has a material outlet (400); The bottom of the evaporation tower is an inverted cone shape that gradually narrows to the material outlet (400). Inside the evaporation tower, a gas collecting ring (500) is provided below the atomizing plate (200). The gas collecting ring (500) is arranged horizontally and has an opening. The opening on the gas collecting ring (500) is located at the bottom or the inner side of the gas collecting ring (500) at an angle.

2. The high-efficiency atomizing evaporation tower according to claim 1, characterized in that, An arc-shaped guide groove (203) is formed between the guide vanes (202) around the atomizing disc (200). The high-salt wastewater in the atomizing disc (200) is thrown out from the arc-shaped guide groove (203) when the atomizing disc (200) rotates.

3. The high-efficiency atomizing evaporation tower according to claim 1, characterized in that, The central hot air outlet (302) is arranged in a ring above the atomizing disc (200). There are at least two central hot air outlets (302) and they are located at different heights. The central hot air outlet (302) has an inverted cone design.

4. The high-efficiency atomizing evaporation tower according to claim 3, characterized in that, The top of the evaporator is provided with a circular distributor (300), and a spiral air inlet guide plate (304) is provided inside the distributor (300). The hot air inlet (301) is set on the distributor (300) and located at the tangent position of the distributor (300). The air duct inlet of the hot air inlet (301) is set as a rectangular opening and designed as a gradually narrowing air duct. Inclined hot air guide plates (305) are provided inside the central hot air outlet (302) and the circumferential hot air outlet (303), so that the air outlet of the central hot air outlet (302) and the circumferential hot air outlet (303) is spiral.

5. The high-efficiency atomizing evaporation tower according to claim 4, characterized in that, The air outlet rotation direction of the central hot air outlet (302) and the circumferential hot air outlet (303) is opposite to the rotation direction of the atomizing disc (200).

6. The high-efficiency atomizing evaporation tower according to claim 1, characterized in that, The motor (800) is located above the distributor (300) and is connected to the atomizing disc (200) via a rotating shaft.

7. The high-efficiency atomizing evaporation tower according to claim 1, characterized in that, A metal filter screen is provided at the opening, and a hot air outlet (501) extending to the outside of the evaporation tower is connected to the gas collecting ring (500).

8. The high-efficiency atomizing evaporation tower according to claim 1, characterized in that, An observation window (600) is provided on the side of the evaporation tower.

9. The high-efficiency atomizing evaporation tower according to claim 1, characterized in that, The evaporation tower is equipped with a support frame (700) on its outer side.

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