High-efficiency evaporation double-layer split-flow type spiral volute hot air distributor

Abstract

The application discloses a high-efficiency evaporation double-layer shunt type spiral volute hot air distributor, and relates to the technical field of rotary spray drying. The hot air distributor can maximize the distribution of hot air, so that the hot air fully contacts with mist drops to evaporate and crystallize, has the advantages of wide application range, high hot air utilization rate, low energy consumption, good material liquid atomization effect, simple manufacturing and the like. The hot air distributor comprises a hot air distributor body assembly, a hot air distributor shell and a double-layer conical volute, the hot air distributor shell is arranged on the hot air distributor body, a plurality of air inlets are uniformly distributed on the hot air distributor shell in the circumferential direction, a spiral air inlet volute is arranged outside the hot air distributor shell, and the lower part of the hot air distributor shell is connected with the double-layer conical volute. The double-layer conical volute can make the hot air flowing into the air inlets flow out in layers. The application is used for improving the performance of the hot air distributor.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of rotary spray drying, in particular to a high-efficiency evaporation double-layer shunt spiral volute hot air distributor. BACKGROUND

[0002] High-salinity wastewater refers to industrial or domestic wastewater with a mass fraction of salt (calculated according to the content of NaCl) exceeding 3.5%, mainly from domestic sewage, seawater desalination, coal and chemical industry, etc. The existing zero-emission technologies for high-salinity wastewater are all multi-process combined technologies, that is, after pretreatment, the salt water is separated by membrane concentration or thermal evaporation to realize zero emission. However, these technologies have unavoidable limitations such as small applicable range, easy scaling and corrosion, high operation cost and low separation efficiency. Therefore, developing low-energy-consumption and high-efficiency zero-emission technologies to realize the recycling of waste resources has become a bottleneck that needs to be broken through in the current wastewater treatment. The rotary spray drying technology has attracted widespread attention in various zero-emission desulfurization wastewater, and the core part is the hot air distributor. The application innovatively applies it to the treatment of high-salinity wastewater. SUMMARY

[0003] The embodiment of the application provides a high-efficiency evaporation double-layer shunt spiral volute hot air distributor, which can maximize the distribution of hot air, so that the hot air fully contacts with the mist drops and then evaporates and crystallizes, has the advantages of wide applicable range, high hot air utilization rate, low energy consumption, good material liquid atomization effect and simple manufacturing.

[0004] To achieve the above-mentioned purpose, the embodiment of the application provides a high-efficiency evaporation double-layer shunt spiral volute hot air distributor, which comprises a hot air distributor body assembly, a hot air distributor shell and a double-layer conical inlet volute, which are sleeved on the hot air distributor body; a plurality of air inlets are uniformly distributed on the circumferential surface of the hot air distributor shell; a spiral inlet volute is sleeved on the outer part of the hot air distributor shell; the lower part of the hot air distributor shell is connected with the double-layer conical inlet volute; and the double-layer conical inlet volute can make the hot air flowing into the air inlets flow out in layers.

[0005] Further, the double-layer conical inlet volute comprises a sleeved outer-layer conical inlet volute and an inner-layer conical inlet volute; the outer-layer conical inlet volute is connected to the lower end of the hot air distributor shell; the upper end of the inner-layer conical inlet volute is connected to the inner wall surface of the hot air distributor shell, and the air inlets are divided into upper air inlets and lower air inlets; the upper air inlets are in communication with the inner-layer conical inlet volute; the lower air inlets are in communication with the outer-layer conical inlet volute; and the lower surface of the inner-layer conical inlet volute is lower than the lower surface of the outer-layer conical inlet volute.

[0006] Further, the upper end of the inner-layer conical air inlet volute is provided with a flow guide plate, and the flow guide plate separates the air inlet into the upper air inlet and the lower air inlet; the flow area of the upper air inlet is greater than that of the lower air inlet.

[0007] Further, a plurality of first S-shaped air disturbance pieces are uniformly distributed on the inner wall of the outer-layer conical air inlet volute in the circumferential direction; and a plurality of second S-shaped air disturbance pieces are uniformly distributed on the inner wall of the inner-layer conical air inlet volute in the circumferential direction.

[0008] Further, the thickness of the first S-shaped air disturbance piece is less than that of the second S-shaped air disturbance piece.

[0009] Further, the air inlet is an inclined long strip-shaped hole.

[0010] Further, the spiral air inlet volute is a non-equal-diameter rectangular spiral volute, and the air duct is a tapered type; the air inlet of the spiral air inlet volute is connected to the hot air inlet pipe, and the air outlet is connected to the air inlet of the hot air distributor shell.

[0011] Further, the hot air distributor body assembly comprises a hot air distributor body and a nested flange for an atomizer connected to the upper end of the hot air distributor body; the upper end of the nested flange for the atomizer is connected to a high-speed rotating atomizer.

[0012] Further, the lower end of the nested flange for the atomizer is connected to a volute straight section flange, and the lower end of the volute straight section flange is connected to the hot air distributor shell.

[0013] Further, the hot air distributor body is a hollow cone with a large upper end and a small lower end; the outer diameter of the upper end of the hot air distributor body is adapted to the inner diameters of the nested flange for the atomizer and the volute straight section flange.

[0014] Compared with the prior art, the present application has the following beneficial effects:

[0015] 1. The double-layer conical air inlet volute connected to the air inlet of the hot air distributor shell can distribute the inner / outer hot air chamber volume according to different characteristics of the material liquid and the spatial distribution characteristics of the mist droplets, reconfigure the space of the hot air, and thus the application range of the hot air distributor is wider.

[0016] 2. The first S-shaped air disturbance piece arranged on the inner wall of the outer-layer conical air inlet volute and the second S-shaped air disturbance piece arranged on the inner wall of the inner-layer conical air inlet volute can block the hot air, increase the residence time of the hot air, make more hot air exchange heat with the splashed material liquid droplets in the atomizing disc, shorten the evaporation time of the material liquid droplets, and enhance the atomizing effect.

[0017] 3. The application can change the horizontal flow of hot air into spiral downward flow by setting the spiral air inlet volute as a non-equal-diameter rectangular spiral volute shape, and the air duct as a tapered type, combined with the characteristics of the liquid sprayed by the atomizing disc, and has uniform air temperature distribution and air volume in any cross-sectional area of the hot air distribution port, which is beneficial to improve the evaporation efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0019] Figure 1 Structure diagram of the high-efficiency evaporation double-layer shunt spiral volute hot air distributor of the embodiment of the present application;

[0020] Figure 2 Structure diagram of the hot air distributor body in the high-efficiency evaporation double-layer shunt spiral volute hot air distributor of the embodiment of the present application;

[0021] Figure 3 Structure diagram of the volute straight section flange in the high-efficiency evaporation double-layer shunt spiral volute hot air distributor of the embodiment of the present application;

[0022] Figure 4 Structure diagram of the hot air distributor shell in the high-efficiency evaporation double-layer shunt spiral volute hot air distributor of the embodiment of the present application;

[0023] Figure 5 Structure diagram of the spiral air inlet volute in the high-efficiency evaporation double-layer shunt spiral volute hot air distributor of the embodiment of the present application;

[0024] Figure 6 Front view of the spiral air inlet volute in the high-efficiency evaporation double-layer shunt spiral volute hot air distributor of the embodiment of the present application;

[0025] Figure 7 A-A sectional view of Figure 6

[0026] Figure 8 Structure diagram of the outer layer conical air inlet volute in the high-efficiency evaporation double-layer shunt spiral volute hot air distributor of the embodiment of the present application;

[0027] Figure 9 Structure diagram of the inner layer conical air inlet volute in the high-efficiency evaporation double-layer shunt spiral volute hot air distributor of the embodiment of the present application. DETAILED DESCRIPTION​

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0029] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation to the present application.

[0030] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; for those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0031] The terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more.

[0032] The rotary spray drying technology has attracted widespread attention in various desulfurization wastewater zero discharge, and the present application innovatively applies it to the treatment of high-salt wastewater. The core equipment is a hot air distributor, which combines the spatial distribution characteristics of the high-speed rotary atomizing disc to spray droplets, and designs a shunt type spiral inlet volute to non-uniformly distribute hot air to a double-layer conical inlet volute, so that the hot air can be fully contacted with the droplets in space after being adjusted by the hot air distributor, and then evaporated and crystallized.

[0033] Reference Figure 1The embodiment of the present application provides a high-efficiency evaporation double-layer shunt type spiral volute hot air distributor, which comprises a hot air distributor body assembly 1, a hot air distributor shell 2 sleeved on the hot air distributor body and a double-layer conical volute air inlet 3. A plurality of air inlets 21 are uniformly distributed on the circumferential direction of the hot air distributor shell 2. The outer part of the hot air distributor shell 2 is sleeved with a spiral air inlet volute 4. The lower part of the hot air distributor shell 2 is connected with the double-layer conical volute air inlet 3, and the double-layer conical volute air inlet 3 can make the hot air entering the air inlets 21 flow out in layers.

[0034] Referring to Figure 2 , the hot air distributor body assembly 1 comprises a hot air distributor body 11 and a atomizer nesting flange 12 welded on the upper end of the hot air distributor body 11. The upper end of the atomizer nesting flange 12 is connected with a high-speed rotating atomizer. The hot air distributor body 11 is a hollow cone with a large upper end and a small lower end, and the outer diameter of the upper end is matched with the inner diameter of the atomizer nesting flange 12.

[0035] Referring to Figure 1 , Figure 3 and Figure 4 , the hot air distributor body 11 is sleeved with the hot air distributor shell 2. The hot air distributor shell 2 is a cylinder, and the upper end is sealingly connected with the lower end of the atomizer nesting flange 12 through a volute straight flange 5. A plurality of air inlets 21 are arranged on the cylinder wall close to the lower end. The air inlets 21 are inclined long strip holes. Specifically, the hot air distributor body 11 is welded on the lower end of the volute straight flange 5.

[0036] Referring to Figure 1 , Figure 5 , Figure 6 and Figure 7 , the spiral air inlet volute 4 is welded on the outer wall surface of the hot air distributor body 11. The spiral air inlet volute 4 is a non-equal-diameter rectangular spiral volute, and the air duct is a tapered type. The outer air inlet is connected with the hot air inlet pipe, and the inner air outlet is connected with the air inlets 21 of the hot air distributor shell 2. The position of the spiral air inlet volute 4 corresponds to the position of the air inlets 21. Thus, the hot air can be changed from horizontal flow to spiral downward flow. The position of the hot air distributor shell 2 provided with the air inlets 21 has uniform air temperature distribution and air volume in the cross-sectional area, which can improve the evaporation efficiency.

[0037] In addition, due to the high-speed rotation of the rotating atomizing disc, a strong centrifugal force is generated, and the atomizing disc with the feed liquid and the air around the atomizing disc are forced to drive, forming a low pressure area under high-speed movement. Therefore, by setting the spiral air inlet volute 4 as a non-equal-diameter rectangular spiral volute, the air duct is set as a tapered type, the direction of the liquid droplets sprayed by the atomizing disc in the application and the direction of the spiral hot air are opposite, so that the tapered air duct of the spiral air inlet volute 4 generates a spiral downward air flow. The liquid droplets and the hot air flow collide, forming a vortex on the atomizing disc surface. The liquid droplets exchange more heat with the hot air, improve the utilization rate of the hot air, and are more conducive to reducing energy consumption and improving evaporation efficiency.

[0038] Referring to Figure 1 , the double-layered conical air inlet volute 3 comprises an outer conical air inlet volute 31 and an inner conical air inlet volute 32.

[0039] Referring to Figure 8 , the outer conical air inlet volute 31 is a conical cylinder with a large upper end and a small lower end, the upper end of which is equal in diameter to the hot air distributor shell 2 and is welded to the lower end of the hot air distributor shell 2, and the lower end and the inner conical air inlet volute 32 form an outer air outlet.

[0040] Referring to Figure 9 , the inner conical air inlet volute 32 is also a conical cylinder with a large upper end and a small lower end, and the upper end of the inner conical air inlet volute 32 is provided with a flow guide plate 322, which is welded to the inner wall surface of the hot air distributor shell 2 and separates the air inlet 21 into an upper air inlet 211 and a lower air inlet 212. The lower end of the inner conical air inlet volute 32 and the hot air distributor body 11 form an inner air outlet. The lower surface of the inner conical air inlet volute 32 is lower than the lower surface of the outer conical air inlet volute 31.

[0041] The flow area of the upper air inlet 211 is larger than that of the lower air inlet 212, and the upper air inlet 211 communicates with the inner conical air inlet volute 32, and the lower air inlet 212 communicates with the outer conical air inlet volute 31. According to the spatial distribution characteristics of the mist droplets sprayed by the high-speed rotating atomizing disc, the particle size of the liquid droplets sprayed by the atomizing disc is larger and the liquid quantity is more near the air outlet of the inner conical air inlet volute 32. By setting the flow guide plate to non-uniformly separate the air inlet 21, the air volume distributed to the inner layer hot air chamber between the inner conical air inlet volute 32 and the hot air distributor body 11 is more than the air volume of the outer layer hot air chamber composed of the outer conical air inlet volute 31 and the inner conical air inlet volute 32, further enhancing the heat exchange effect.

[0042] The inner wall of the outer layer cone-shaped air inlet volute 31 is uniformly distributed with a plurality of first S-shaped air disturbing pieces 311 in the circumferential direction, and the inner wall of the inner layer cone-shaped air inlet volute 32 is uniformly distributed with a plurality of second S-shaped air disturbing pieces 321 in the circumferential direction. Thus, the first S-shaped air disturbing pieces 311 and the second S-shaped air disturbing pieces 321 can play a role in retarding the flow of hot air, increasing the time of hot air staying, so that more hot air exchanges heat with the liquid droplets splashed in the atomizing disc, thereby shortening the evaporation time of the liquid droplets and enhancing the atomizing effect.

[0043] In addition, since the thickness of the first S-shaped air disturbing piece 311 in the present application is less than the thickness of the second S-shaped air disturbing piece 321, the inner layer hot air chamber space volume is greater than the outer layer hot air chamber space volume, and near the air outlet of the inner layer cone-shaped air inlet volute 32, the particle size of the liquid droplets sprayed by the atomizing disc is larger and the liquid quantity is more, so the atomizing effect can be further enhanced.

[0044] The working principle of the embodiment of the present application is as follows:

[0045] Air is sent to the air heater by the air blower, heated to the set temperature, and then enters the evaporation chamber through the present application to exchange heat with the atomized liquid droplets. Specifically, the hot air at the preset temperature flows into the air inlet 21 of the hot air distributor shell 2 through the spiral air inlet volute 4, and is then non-uniformly distributed into the inner layer hot air chamber composed of the inner layer cone-shaped air inlet volute 32 and the hot air distributor body 11, and the outer layer hot air chamber composed of the outer layer cone-shaped air inlet volute 31 and the inner layer cone-shaped air inlet volute 32. Since the spiral air inlet volute 4 is a non-equal-diameter rectangular spiral volute and the air duct is tapered, the position of the hot air distributor shell 2 provided with the air inlet 21 has uniform air temperature distribution and air volume in the cross-sectional area. Since improving the uniformity of the inlet air temperature is beneficial to improving the evaporation efficiency, the present application can improve the evaporation efficiency.

[0046] Most importantly, considering the spatial distribution characteristics of the mist droplets sprayed by the high-speed rotating atomizing disc. Near the air outlet of the inner layer cone-shaped air inlet volute 32, the particle size of the liquid droplets sprayed by the atomizing disc is larger and the liquid quantity is more, so the present application sets a drainage plate 322 in the inner layer cone-shaped air inlet volute 32 to non-uniformly separate the air inlet 21, so that the air volume distributed into the inner layer hot air chamber composed of the inner layer cone-shaped air inlet volute 32 and the hot air distributor body 11 is greater than the air volume distributed into the outer layer hot air chamber composed of the outer layer cone-shaped air inlet volute 31 and the inner layer cone-shaped air inlet volute 32. In turn, the liquid evaporation rate is improved, and the hot air utilization rate is maximized.

[0047] A part of the hot air is non-uniformly distributed into the outer layer hot air chamber composed of the outer layer cone inlet volute 31 and the inner layer cone inlet volute 32, is blocked by the first S-shaped air disturbance piece 311 in the outer layer cone inlet volute 31, and is discharged from the outer layer air outlet, respectively, to perform a violent heat and mass transfer process with the high-salt wastewater mist droplets sprayed by the high-speed rotating atomizing disc. The first S-shaped air disturbance piece 311 plays a role in blocking the hot air speed, increases the hot air residence time, so that more hot air exchanges heat with the splashing liquid droplets in the atomizing disc, thereby shortening the evaporation time of the liquid droplets and enhancing the atomizing effect.

[0048] Similarly, another part of the hot air is non-uniformly distributed into the inner layer hot air chamber composed of the inner layer cone inlet volute 32 and the hot air distributor body 11, is blocked by the second S-shaped air disturbance piece 321 in the inner layer cone inlet volute 32, and is discharged from the inner layer air outlet to perform a violent heat and mass transfer process with the high-speed rotating atomizing disc. The evaporated and precipitated crystalline salt is collected at the bottom of the tower for centralized treatment, thereby realizing zero discharge treatment of high-salt wastewater.

[0049] It should be noted that, due to the fact that the particle size of the liquid droplets sprayed by the atomizing disc is larger and the liquid quantity is more near the air outlet of the inner layer cone inlet volute 32, the inner layer hot air chamber has a larger space volume than the outer layer hot air chamber, that is, the thickness of the first S-shaped air disturbance piece 311 in the outer layer cone inlet volute 31 is smaller than the thickness of the second S-shaped air disturbance piece in the inner layer cone inlet volute 32.

[0050] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any change or replacement within the technical scope disclosed in the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A high-efficiency evaporating double-layer split-flow type spiral-casing hot-air distributor, characterized in that, The hot air distributor body assembly, the hot air distributor shell and the double-layered conical air inlet volute; the hot air distributor shell is provided with a plurality of air inlets which are uniformly distributed in the circumferential direction; the outer part of the hot air distributor shell is provided with a spiral air inlet volute; the lower part of the hot air distributor shell is connected with the double-layered conical air inlet volute; the double-layered conical air inlet volute can make the hot air flowing into the air inlets flow out in layers. The double-layered conical air inlet volute comprises an outer-layered conical air inlet volute and an inner-layered conical air inlet volute; the outer-layered conical air inlet volute is connected with the lower end of the hot air distributor shell; the upper end of the inner-layered conical air inlet volute is connected with the inner wall surface of the hot air distributor shell; the upper end of the inner-layered conical air inlet volute is provided with a flow guide plate which separates the air inlets into upper air inlets and lower air inlets; the flow area of the upper air inlets is larger than that of the lower air inlets; the upper air inlets are communicated with the inner-layered conical air inlet volute; the lower air inlets are communicated with the outer-layered conical air inlet volute; the lower surface of the inner-layered conical air inlet volute is lower than that of the outer-layered conical air inlet volute. The spiral air inlet volute is a non-equal-diameter rectangular spiral volute, and the air duct is a tapered type; the air inlet of the spiral air inlet volute is communicated with the hot air inlet pipe, and the air outlet is communicated with the air inlets of the hot air distributor shell.

2. The high-efficiency evaporating double-layer split-type spiral-volute hot-air distributor according to claim 1, characterized in that, The inner wall of the outer-layered conical air inlet volute is provided with a plurality of first S-shaped air disturbance pieces which are uniformly distributed in the circumferential direction; the inner wall of the inner-layered conical air inlet volute is provided with a plurality of second S-shaped air disturbance pieces which are uniformly distributed in the circumferential direction.

3. The high-efficiency evaporating double-layer split-type spiral-volute hot-air distributor according to claim 2, characterized in that, The thickness of the first S-shaped air disturbance pieces is smaller than that of the second S-shaped air disturbance pieces.

4. The high performance evaporative double layer split- flow spiral volute hot air distributor according to claim 1, wherein The air inlets are inclined long strip holes.

5. The high performance evaporative double layer split- flow spiral volute hot air distributor according to claim 1, wherein, The hot air distributor body assembly comprises a hot air distributor body and a nest flange for atomizer which is connected with the upper end of the hot air distributor body; the upper end of the nest flange for atomizer is connected with a high-speed rotating atomizer.

6. The high performance evaporative double layer split- flow spiral volute hot air distributor according to claim 5, wherein, The lower end of the nest flange for atomizer is connected with a volute straight section flange, and the lower end of the volute straight section flange is connected with the hot air distributor shell.

7. The high performance evaporative double layer split- flow spiral volute hot air distributor according to claim 6, wherein The hot air distributor body is a hollow cone which is large at the upper end and small at the lower end; the outer diameter of the upper end of the hot air distributor body is matched with the inner diameter of the nest flange for atomizer and the inner diameter of the volute straight section flange.

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