A leach liquor concentrate atomizing evaporator

Abstract

The application provides a leachate concentrate atomizing and evaporating device, and relates to the technical field of landfill leachate concentrate treatment. The device comprises a foldable box body, a liquid guide pipe fixed at the bottom of the foldable box body, a telescopic connecting rod mechanism movably connected with the liquid guide pipe, and telescopic fillers arranged between adjacent connecting rod mechanisms; the foldable box body is provided with a containing cavity, the bottom of the containing cavity is provided with a water vapor evaporation part, the top of the water vapor evaporation part is provided with a steam hole; at least four atomizing nozzles are arranged on the outer wall of the liquid guide pipe; the connecting rod mechanism comprises a positioning nest fixed on the outer wall of the liquid guide pipe, a movable nest sleeved on the outer wall of the liquid guide pipe, a first support frame, a second support frame, a third support frame and a bearing frame. The device combines two kinds of evaporation crystallization modes to treat the concentrate, has high solar energy utilization rate and high production efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of landfill leachate concentrate treatment, and particularly relates to a leachate concentrate atomization and evaporation device. BACKGROUND

[0002] At present, MBR+NF process is mostly used in waste incineration plants and landfill leachate treatment plants to treat landfill leachate. The process is stable in operation, and the tail water can meet the standard, but NF concentrate is produced. The yield of NF concentrate is generally between 15-30%, and the concentrate contains a large amount of refractory organic matter and salt which are difficult to treat. The treatment of concentrate has become the biggest challenge faced by each leachate treatment plant.

[0003] A large amount of concentrated brine is inevitably produced in the process of industrial wastewater zero discharge desalination. The main components of the concentrated brine are inorganic salts and heavy metals, and also contain a small amount of chemicals used in the processes of pretreatment, chlorination, dechlorination and desalination, such as scale inhibitors, acids and other reaction products. The treatment of concentrated brine has become a key technology restricting the zero discharge of industrial wastewater in various industries.

[0004] Concentrated brine treatment technology includes concentrated brine concentration technology and concentrated brine final disposal technology. On the one hand, water resources are recovered as much as possible, and on the other hand, due to the extremely high cost of concentrated brine final disposal, the concentrated brine needs to be concentrated first to make the salt content (TDS) mass concentration reach 50000-80000 mg / L, so as to reduce the scale of the final disposal process, reduce investment and save energy.

[0005] Several common traditional treatment methods of nanofiltration concentrate.

[0006] NF nanofiltration membrane mainly filters and adsorbs and concentrates, so the salt and refractory dissolved solids in the concentrate discharged through the NF membrane system are enriched in the concentrate, which is very difficult to treat.

[0007] At present, the following methods are commonly used to treat concentrated brine:

[0008] 1. Concentrated brine is recharged into the landfill

[0009] Disadvantages: It will cause the enrichment of salt and refractory organic matter in the original leachate of the landfill, and eventually lead to the collapse of MBR biochemical and NF operation.

[0010] 2. Evaporation process is used to treat concentrated brine

[0011] Disadvantages: high cost, and the crystallization of mixed salt is difficult to handle. If the mixed salt is backfilled into a landfill, it needs to be bagged or partitioned, which still has the risk of secondary pollution. The current cost of treating leachate is generally 60-100 yuan / ton, while the cost of treating all leachate (including concentrated liquid) is more than 120 yuan / ton.

[0012] The main treatment process of existing landfill leachate NF concentrated liquid is as follows Figure 1 , the route is complex and the cost is high, and some process routes cannot even be stably operated.

[0013] 3. Combined with a landfill incineration plant, the concentrated liquid is returned to the furnace for back spraying or lime slurry treatment.

[0014] Disadvantages: limited capacity, and the yield of concentrated liquid must be controlled to achieve full treatment. Most leachate treatment plants do not have the conditions for concentrated liquid back spraying, which has an impact on the power generation capacity of the incineration plant. The composition of the concentrated liquid is complex, with high salt content, which also has a certain impact on the furnace.

[0015] The common treatment methods for concentrated liquid in the prior art are as follows:

[0016] (1) Evaporation pond treatment of concentrated salt water. A depression is dug on the ground to serve as a storage pool for concentrated concentrated water. Under suitable weather conditions, sufficient solar energy can be effectively utilized to store concentrated salt water in the evaporation pond and gradually evaporate it, and the residual solid salt is removed regularly. Natural evaporation pond has slow evaporation speed, large evaporation area, and rainy weather will increase the water content in the evaporation pond, reducing the evaporation crystallization efficiency.

[0017] (2) Evaporation crystallizer. It mainly refers to a crystallizer that makes the solution reach supersaturation under the production conditions and then crystallize and separate. The current enhanced evaporation crystallization technology mainly includes mechanical compression evaporation process (MVR), multi-effect evaporation (MED), multi-stage flash evaporation (MSF), and membrane distillation (MD).

[0018] High-salt wastewater treated by evaporation technology is easily concentrated when the evaporation process in the evaporator exceeds the saturation solubility limit. The salt in the water is easily crystallized and attached to the surface of the heat exchange tube to form scale, affecting the efficiency of the heat exchanger, and even blocking the heat exchange tube.

[0019] The concentrated liquid treatment method in the prior art can only work when there is abundant sunlight, and the evaporation crystallizer is prone to blockage during production, resulting in low production efficiency. SUMMARY

[0020] The present application provides a leachate concentrate atomization evaporation device to solve the low solar utilization rate and low production efficiency in the concentrate treatment process of each process section in the leachate treatment in the prior art.

[0021] To achieve the above-mentioned application purposes, the technical solutions provided by the present application are as follows:

[0022] A leachate concentrate atomization evaporation device, characterized in that it comprises a foldable box body, a liquid guide pipe fixedly arranged at the bottom of the foldable box body, and a telescopic connecting rod mechanism movably connected with the liquid guide pipe, wherein telescopic fillers are arranged between adjacent connecting rod mechanisms.

[0023] The foldable box body is provided with a containing cavity, the bottom of the containing cavity is provided with a water vapor evaporation part, the top of the water vapor evaporation part is provided with a vapor hole, and the outer wall of the liquid guide pipe is provided with at least four atomization nozzles.

[0024] Preferably, the connecting rod mechanism comprises a positioning nest fixedly arranged on the outer wall of the liquid guide pipe, a movable nest sleeved on the outer wall of the liquid guide pipe, a first support frame having one end pivotally connected with the movable nest and the other end pivotally connected with the middle part of a second support frame, a third support frame pivotally connected with the second support frame, a load-bearing frame having one end pivotally connected with the positioning nest and the other end pivotally connected with the first middle part of the first support frame, a first limiting support frame pivotally connected between the load-bearing frame and the second support frame, and a second limiting support frame pivotally connected between the first support frame and the third support frame.

[0025] Preferably, the number of the connecting rod mechanisms is at least three.

[0026] Preferably, the evaporation device further comprises an evaporation membrane fixedly arranged on the inner wall of the foldable box body and located directly above the water vapor evaporation part.

[0027] Preferably, the inclination angle of the evaporation membrane is 30-45°.

[0028] Preferably, the evaporation device further comprises an effusion tank in communication with the containing cavity through a through hole in the foldable box body, and the through hole abuts against the lowest end of the evaporation membrane.

[0029] Preferably, the cross section of the telescopic filler is fan-shaped.

[0030] Preferably, the telescopic filler has an outer side surface and an inner side surface, the inner side surface forms an inner cavity with the outer wall of the liquid guide pipe, and the atomization nozzles are arranged in the inner cavity.

[0031] Preferably, the top of the foldable box body is provided with an openable and closable cover body and a condensation exhaust port.

[0032] Preferably, the liquid guide pipe comprises horizontal rods and vertical rods in communication with each other, the vertical rods are fixed to the bottom of the foldable box, and the liquid inlet end of the horizontal rod can be accommodated in the notch on the upper edge of the foldable box, so that the accommodation cavity is a sealed cavity when the cover is closed.

[0033] The use steps of the atomization evaporation device in the application are as follows:

[0034] When it is cloudy, the telescopic filler is retracted by the telescopic connecting rod mechanism, then the foldable box is stretched, the telescopic filler and the liquid guide pipe are covered by the foldable box, the liquid inlet end of the horizontal rod is accommodated in the notch on the upper edge of the foldable box, the cover is closed, the accommodation cavity becomes a closed cavity, the concentrated liquid is pumped into the liquid guide pipe, the telescopic filler absorbs the concentrated liquid under the action of the atomization nozzle, and the water vapor evaporation part is started or the residual heat atomization evaporation is used, the generated water vapor goes upward through the vapor hole, the water vapor in the telescopic filler flows countercurrently to the liquid in the telescopic filler, continuously passes through the interspace of the telescopic filler, and the gas-liquid two-phase closely contacts on the surface of the telescopic filler to perform mass transfer, the water in the concentrated liquid droplets is discharged through the condensation exhaust port, and evaporation crystallization is realized.

[0035] When it is sunny, the water vapor evaporation part is closed, the cover is opened, the telescopic filler and the liquid guide pipe are exposed by compressing the foldable box, the telescopic filler is stretched by the telescopic connecting rod mechanism, the concentrated liquid is pumped into the liquid guide pipe, the telescopic filler absorbs the concentrated liquid under the action of the atomization nozzle, and evaporation crystallization of the concentrated liquid on the telescopic filler is performed under the action of sunlight. In this stage, the telescopic filler is stretched, so that the contact area for absorbing sunlight is increased, and the solar energy absorption capacity is enhanced.

[0036] After the evaporation crystallization is completed, the telescopic filler is removed, and the crystalline substance is removed.

[0037] Compared with the prior art, the technical scheme has at least the following beneficial effects: in the application, the telescopic filler absorbing the concentrated liquid is stretched on a sunny day, the utilization rate of solar energy is improved, energy saving and environmental protection are realized, water vapor crystallization is realized by using electricity on a cloudy day, heat is transferred when water vapor contacts the concentrated liquid, water is removed, and crystallization is realized. The device is dual-purpose, the device is spread out on a sunny day, and the device is used by electricity or residual heat atomization evaporation on a rainy day. The concentrated liquid is treated by combining the two evaporation crystallization modes, the utilization rate of solar energy is good, the production efficiency is high, and the problem of pipeline blockage caused by crystalline accumulation can be effectively solved. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 The main treatment process flowchart of the existing garbage leachate concentrated liquid NF concentrated liquid is shown in the following figure:

[0039] Figure 2A structure schematic view of a leachate concentrate atomizing and evaporating device provided in the specific embodiment of the present application;

[0040] Figure 3 Another structure schematic view of a leachate concentrate atomizing and evaporating device provided in the specific embodiment of the present application;

[0041] Figure 4 A structure schematic view of a foldable box of a leachate concentrate atomizing and evaporating device provided in the specific embodiment of the present application;

[0042] Figure 5 Another structure schematic view of a foldable box of a leachate concentrate atomizing and evaporating device provided in the specific embodiment of the present application;

[0043] Figure 6 A structure schematic view of a connecting rod mechanism of a leachate concentrate atomizing and evaporating device provided in the specific embodiment of the present application;

[0044] Figure 7 Another structure schematic view of a connecting rod mechanism of a leachate concentrate atomizing and evaporating device provided in the specific embodiment of the present application;

[0045] Figure 8 A top view of a leachate concentrate atomizing and evaporating device provided in the specific embodiment of the present application.

[0046] Wherein, the foldable box 1, the accommodating cavity 11, the water vapor evaporating part 12, the vapor hole 121, the through hole 13, the cover 14, the condensation exhaust port 15, the notch 16, the liquid guide pipe 2, the horizontal rod 21, the vertical rod 22, the atomizing nozzle 3, the connecting rod mechanism 4, the first connecting rod mechanism 4a, the second connecting rod mechanism 4b, the third connecting rod mechanism 4c, the fourth connecting rod mechanism 4d, the positioning nest 41, the movable nest 42, the first support frame 43, the second support frame 44, the third support frame 45, the load-bearing frame 46, the first limiting support 47, the second limiting support 48, the telescopic filler 5, the outer side 51, the inner side 52, the evaporating film 6, the liquid accumulation tank 7, the built-in cavity 8. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without any creative effort belong to the scope of protection of the present application.

[0048] As Figures 2 to 7As shown, the embodiment of the present application provides a leachate concentrate atomization evaporation device, which comprises a foldable box body 1, a liquid guide pipe 2 fixedly arranged at the bottom of the foldable box body 1, a telescopic connecting rod mechanism 4 movably connected with the liquid guide pipe 2, and a telescopic filler 5 arranged between adjacent connecting rod mechanisms 4. One side of the telescopic filler 5 is fixed with the nearest connecting rod mechanism 4, and the other side is fixed with another adjacent connecting rod mechanism 4, like hanging clothes. It is emphasized that the connecting rod mechanism 4 is used as a support frame to support the telescopic filler 5, and the extension or contraction of the telescopic filler 5 can be controlled by controlling the extension or contraction of the connecting rod mechanism 4. The foldable box body 1 is provided with a containing cavity 11, the bottom of the containing cavity 11 is provided with a water vapor evaporation part 12, and the top of the water vapor evaporation part 12 is provided with a vapor hole 121. The outer wall of the liquid guide pipe 2 is provided with at least four atomization nozzles 3, and the atomization nozzles 3 are multi-layered, for example, four atomization nozzles 3 are arranged around a certain height of the liquid guide pipe 2, and four atomization nozzles 3 are arranged around another height, forming multi-layered nozzles, and each layer has four nozzles, which can improve the uniform absorption of the telescopic filler 5 to the concentrate liquid and increase the absorption amount. The structure of the telescopic filler 5 is somewhat like a sponge, an elastic expansion filler, which expands when stretched by external force and shrinks when relaxed. These fillers can absorb liquid.

[0049] As shown in Figure 6 , 7 The connecting rod mechanism 4 comprises a positioning nest 41 fixed to the outer wall of the liquid guide pipe 2, a movable nest 42 sleeved on the outer wall of the liquid guide pipe 2, a first support frame 43 having one end pivoted to the movable nest 42 and the other end pivoted to the middle part of a second support frame 44, a third support frame 45 having a middle part pivoted to the second support frame 44, a load-bearing frame 46 having one end pivoted to the positioning nest 41 and the other end pivoted to the first middle part of the first support frame 43, a first limiting support 47 pivoted between the load-bearing frame 46 and the second support frame 44, and a second limiting support 48 pivoted between the first support frame 43 and the third support frame 45. The connecting rod mechanism 4 drives the extension or contraction of the telescopic filler 5, and the extension or contraction of the connecting rod mechanism 4 can be adjusted by moving the movable nest 42 up and down.

[0050] To ensure the stability of the overall structure, the number of connecting rod mechanisms 4 is three or more than three. In this embodiment, the number of connecting rod mechanisms 4 is four, which are respectively a first connecting rod mechanism 4a, a second connecting rod mechanism 4b, a third connecting rod mechanism 4c, and a fourth connecting rod mechanism 4d. Moving the movable nest 42 up and down makes the first connecting rod mechanism 4a, the second connecting rod mechanism 4b, the third connecting rod mechanism 4c, and the fourth connecting rod mechanism 4d extend or contract at the same time. After the telescopic filler 5 is fixed between the first connecting rod mechanism 4a, the second connecting rod mechanism 4b, the third connecting rod mechanism 4c, and the fourth connecting rod mechanism 4d, a cylindrical shape can be formed, and the top view is as shown in Figure 8 .

[0051] As Figure 4 , 5 shown, the evaporation device further comprises an evaporation film 6 fixed to the inner wall of the foldable box 1 directly above the water vapor evaporation part 12, the inclination angle of the evaporation film 6 is 30-45°, the evaporation device further comprises a liquid accumulation tank 7 in communication with the accommodating cavity 11 through a through hole 13 on the foldable box 1, and the through hole 13 is in abutment with the lowest end of the evaporation film 6. The top of the foldable box 1 is provided with an openable and closable cover 14 and a condensation exhaust port 15.

[0052] Because part of the liquid droplets cannot be absorbed by the telescopic filler 5 during the atomization spraying of the concentrated liquid, and fall into the water vapor evaporation part 12, which causes the blockage of the vapor hole 121, a layer of evaporation film 6 is arranged, water vapor can pass through the evaporation film 6, and upwardly contact the concentrated liquid in the telescopic filler 5, the concentrated liquid droplets cannot pass through the evaporation film 6, and are gathered on the surface of the evaporation film 6, and flow into the liquid accumulation tank 7 under the action of gravity after enrichment, so the liquid accumulation tank 7 here needs to use a replaceable tank, for example, the liquid accumulation tank 7 can be screwed on the foldable box 1, and then regularly taken down, and the enriched concentrated liquid can be poured out.

[0053] As Figure 8 shown, the cross section of the telescopic filler 5 is fan-shaped. The telescopic filler 5 has an outer side surface 51 and an inner side surface 52, the inner side surface 52 forms an inner cavity 8 with the outer wall of the liquid guide pipe 2, and the atomization nozzle 3 is arranged in the inner cavity 8. In this way, the amount of atomized concentrated liquid absorbed by the telescopic filler 5 is ensured.

[0054] As Figure 2 shown, the liquid guide pipe 2 comprises a horizontal rod 21 and a vertical rod 22 in communication with each other, the vertical rod 22 is fixed to the bottom of the foldable box 1, and the liquid inlet end of the horizontal rod 21 can be accommodated in the notch 16 on the upper edge of the foldable box 1, so that the accommodating cavity 11 is a sealed cavity when the cover 14 is closed.

[0055] The use steps of the atomization evaporation device in the application are as follows:

[0056] When it is overcast, the telescopic linkage mechanism 4 makes the telescopic filler 5 contract, then the foldable box 1 is stretched, so that the foldable box 1 covers the telescopic filler 5 and the liquid guide pipe 2, and at the same time, the liquid inlet end of the horizontal rod 21 is accommodated in the notch 16 on the upper edge of the foldable box 1, and the cover 14 is closed, so that the accommodating cavity 11 becomes a closed cavity, as Figure 2 , Figure 4 , Figure 6As shown in the figure, the concentrated liquid is pumped into the liquid guide pipe 2, and the telescopic filler 5 absorbs the concentrated liquid under the action of the atomizing nozzle 3. At the same time, the water vapor evaporation part 12 is started, and the generated water vapor goes upwards through the vapor hole 121. The water vapor and the liquid in the telescopic filler 5 flow in opposite directions, continuously pass through the gap of the telescopic filler 5, and closely contact and mass transfer on the surface of the telescopic filler 5. The water in the concentrated liquid droplets is discharged through the condensing exhaust port 15, and evaporation crystallization is realized.

[0057] When it is sunny, the water vapor evaporation part 12 is closed, the cover 14 is opened, and the foldable box body 1 is compressed, so that the telescopic filler 5 and the liquid guide pipe 2 are exposed, as shown in the figure. Figure 3 、 Figure 5 、 Figure 7 As shown in the figure, the telescopic filler 5 is stretched by the extension link mechanism 4, the concentrated liquid is pumped into the liquid guide pipe 2, and the telescopic filler 5 absorbs the concentrated liquid under the action of the atomizing nozzle 3. Evaporation crystallization of the concentrated liquid on the telescopic filler 5 is carried out under the action of sunlight. In this stage, the telescopic filler 5 is stretched, so that the contact area for absorbing sunlight is increased, and the absorption capacity of solar energy is enhanced.

[0058] After the evaporation crystallization is completed, the telescopic filler 5 is removed, and the crystalline substance is taken out. The telescopic filler 5 needs to be removed regularly in the device of the application, and is replaced.

[0059] The above is only a specific embodiment of the application, but the protection scope of the application is not limited thereto, and the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A leachate concentrate atomizing and evaporating device, characterized in that, It includes a foldable box body, a liquid guide tube fixed to the bottom of the foldable box body, and a telescopic linkage mechanism movably connected to the liquid guide tube, with telescopic packing material provided between adjacent linkage mechanisms; The foldable housing has a receiving cavity, the bottom of which has a water vapor evaporation section, and the top of which has a steam hole. The outer wall of the liquid guide tube has at least four atomizing nozzles. The linkage mechanism includes a positioning nest fixed to the outer wall of the liquid guide tube, a movable nest sleeved on the outer wall of the liquid guide tube, a first support frame with one end pivotally connected to the movable nest and the other end pivotally connected to the middle of a second support frame, a third support frame with its middle section pivotally connected to the second support frame, and a load-bearing frame with one end pivotally connected to the positioning nest and the other end pivotally connected to the first middle section of the first support frame. A first limit is pivotally connected between the load-bearing frame and the second support frame. The first support frame and the third support frame are pivotally connected to the second limiting support frame. The number of the linkage mechanism is at least three. The evaporation device also includes an evaporation film fixed to the inner wall of the foldable box and located directly above the water vapor evaporation section. The evaporation film has an inclination angle of 30-45°. The evaporation device also includes a liquid collection tank that communicates with the accommodating cavity through a through hole on the foldable box. The through hole abuts against the lowest end of the evaporation film. The retractable packing has an outer side and an inner side. The inner side and the outer wall of the liquid guide tube form an internal cavity. The atomizing nozzle is disposed in the internal cavity.

2. The leachate concentrate atomizing and evaporating device according to claim 1, characterized in that, The cross-section of the expandable packing is fan-shaped.

3. The leachate concentrate atomizing and evaporating device according to claim 1, characterized in that, The top of the foldable enclosure is equipped with an openable cover and a condensate vent.

4. The leachate concentrate atomizing and evaporating device according to claim 3, characterized in that, The liquid guide tube includes a horizontal bar and a vertical bar that are connected to each other. The vertical bar is fixed to the bottom of the foldable box. The liquid inlet end of the horizontal bar can be accommodated in a notch on the upper edge of the foldable box so that the accommodating cavity is a sealed cavity when the cover is closed.

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