Evaporation plant and process dedicated to the concentration of brine

Abstract

This invention relates to an evaporation device and process specifically for concentrating saline solution. The evaporation device includes a shell, with an air outlet and fan at the top or upper part of the shell, and an air inlet on the lower side wall of the shell. Inside the shell are a water distribution pipe, a set of non-woven fabric, and a support frame; the water distribution pipe and support frame are located at the upper part of the shell; the top end of the non-woven fabric is fixed to the support frame, and the bottom end of the non-woven fabric is fixedly connected to a tension fixing member; a water collection tank and a water outlet are provided at the bottom of the shell; the water outlet of a lift pump is connected to the water distribution pipe via a pulse water generator; a water collection container is located below the water outlet of the shell, and the water inlet of the lift pump is connected to the interior of the water collection container; or the water outlet of the shell is connected to the water inlet of the lift pump. This process uses the above-mentioned evaporation device to evaporate and concentrate saline solution. This invention accelerates evaporation by having the saline solution flowing downwards come into countercurrent contact with the airflow flowing upwards on the surface of the non-woven fabric, and uses a lift pump to achieve circulating evaporation of the saline solution, resulting in low energy consumption and high evaporation efficiency.

Description

Technical Field

[0001] This invention relates to an evaporation device and process specifically for concentrating brine, belonging to the field of brine concentration technology. Background Technology

[0002] The applicant frequently encounters scenarios in wastewater treatment where saline water needs to be evaporated and crystallized. However, directly applying conventional evaporation and crystallization techniques to low-concentration saline water consumes a significant amount of heat energy. If the low-concentration saline water is first evaporated using low-energy air, and then crystallized using conventional techniques after reaching near-saturation concentration, the heat energy required for evaporation and crystallization will be significantly reduced. Existing technologies include methods for concentrating saline water through evaporation; however, these methods are energy-intensive, and there is an urgent need to develop technologies that can effectively reduce energy consumption.

[0003] A search revealed that patent application No. 201210121811.8 and publication No. CN103373785A discloses a brine concentration device that combines cooling concentration and reverse osmosis. The device includes a brine cooling concentration tower, which consists of a tower body, an air inlet, a water distributor, and an induced draft fan. No packing is installed inside. During operation, the water distributor sprays brine from top to bottom, and the air flows from bottom to top under the action of the induced draft fan. The air and brine come into contact and transfer mass and heat inside the tower. Some water enters and the air is released from the top of the tower, thus cooling and concentrating the brine. However, although the reverse osmosis membrane used in this technical solution can reduce the salt concentration and increase the concentration of the separated brine, it has obvious disadvantages: (1) Reverse osmosis membranes are generally used for the concentration of low-concentration brine, and there are obvious limitations if they are used for the concentration of high-concentration brine; (2) Reverse osmosis membranes are very easy to clog and require strict pretreatment measures; (3) The fresh water filtered out by reverse osmosis still contains salt and is not suitable for complete salt recovery. In addition, the evaporation method used in this technical solution has low evaporation efficiency, and during operation, it is easy to directly carry the atomized salt water droplets from the water distributor out of the tower instead of only carrying out the water through evaporation. This will cause salt pollution, and it is not suitable for completely separating and recovering salt from the salt water. Summary of the Invention

[0004] The main objective of this invention is to overcome the problems existing in the prior art and propose an evaporation device and process specifically for concentrating brine, which can effectively improve the evaporation efficiency of brine and maintain a low energy consumption level.

[0005] The technical solution of this invention to solve its technical problem is as follows:

[0006] An evaporation device specifically designed for concentrating saline solution includes a shell and a booster pump. The shell has an air outlet at its top or upper part, connected to the outside, and a fan installed at the outlet. An air inlet connected to the interior of the shell is located at its bottom or lower side wall. Inside the shell are a water distribution pipe, a set of non-woven fabric, and a support frame. The water distribution pipe and support frame are located at the upper part of the shell. The top ends of the non-woven fabric are fixed to the support frame, and the bottom ends are fixedly connected to tensioning fasteners. The non-woven fabric is stretched under the action of the support frame and tensioning fasteners. Gaps are left between adjacent non-woven fabrics. The bottom of the shell has a water collection tank and a water outlet, with the water collection tank connected to the water outlet. The outlet of the booster pump is connected to a pulse water generator via a first water pipe. The pulse water generator is located at the water inlet end of the water distribution pipe and is connected to the water distribution pipe.

[0007] A water collection container for holding salt water is provided below the outlet of the casing, and the inlet of the booster pump is connected to the inside of the water collection container via a second water pipe; or, the outlet of the casing is connected to the inlet of the booster pump via a second water pipe.

[0008] In this structure, non-woven fabric serves as the water distribution carrier, allowing the saline solution to flow downwards along the fabric. A fan creates an upward airflow within the casing. The saline solution interacts counter-currently with the airflow on the non-woven fabric surface to accelerate evaporation. Simultaneously, the unsaturated saline solution is circulated and evaporated by a booster pump. This approach maintains low energy consumption while achieving high evaporation efficiency. Note: During implementation, it is necessary to monitor whether the salt concentration of the saline solution discharged from the casing outlet exceeds 90% of the saturation concentration. If the salt concentration exceeds 90% of the saturation concentration, the equipment should be stopped, and the saline solution transferred to subsequent processes for evaporation and crystallization. This prevents excessive crystallization of saturated saline solution on the non-woven fabric, which could cause equipment blockage, salt crystal accumulation, and other problems that would render the equipment unusable.

[0009] The further improved technical solution of this invention is as follows:

[0010] Preferably, the shell is a cuboid arranged vertically; the group of nonwoven fabrics is arranged in parallel vertically.

[0011] Preferably, the air inlet of the fan is connected to the inside of the casing, and the air outlet of the fan is open to the outside.

[0012] Preferably, the parameters of the nonwoven fabric include hydrophilicity coefficient K, deformation coefficient, and thickness; wherein, the hydrophilicity coefficient K is set to the maximum water absorption mass per square meter of nonwoven fabric (in grams) / the mass of nonwoven fabric per square meter (in grams), and K is 0.5~4.0; the deformation coefficient of the nonwoven fabric in all directions is ≤5% (preferably ≤2%); the thickness is 0.2~2mm; and the spacing between adjacent nonwoven fabrics is at least 2.0mm (preferably 2.0-20mm).

[0013] Preferably, under the action of the fan, an airflow with a speed of 0.5-8 m / s is formed inside the casing, flowing upwards.

[0014] Preferably, the support frame and the water distribution pipe are integrated and integrally formed.

[0015] Preferably, the bottom of the housing is fixed to the support column.

[0016] Preferably, the water distribution pipe is provided with a set of water outlet holes, and the diameter of the water outlet holes is 0.2-2.5mm.

[0017] By adopting the above preferred solutions, the specific technical features of the evaporation equipment can be further optimized.

[0018] The present invention also proposes:

[0019] An evaporation process specifically for concentrating brine, employing the aforementioned evaporation equipment specifically for concentrating brine, includes the following steps:

[0020] Step 1: The booster pump draws the brine from the outlet of the water collection container or shell into the pulse water generator. The pulse water generator distributes water to the non-woven fabric in a pulse water output manner through the water distribution pipe. At the same time, the fan draws air from the air inlet of the shell to the air outlet of the shell and discharges it to the outside, forming an airflow that flows from bottom to top inside the shell, and the airflow speed reaches a preset range. The brine flows from top to bottom along the non-woven fabric and comes into contact with the airflow in the opposite direction to accelerate evaporation.

[0021] The second step involves the saline solution flowing downwards along the non-woven fabric to the bottom and collecting in the water collection tank at the bottom of the shell. It then flows into the water collection container through the outlet of the shell or is directly drawn by the booster pump, allowing the saline solution with a salt concentration below 90% of the saturation concentration to circulate and evaporate.

[0022] In this process, a pulse water distribution method is used to distribute water, which can fully realize uniform water distribution in the pipeline and avoid the evaporation effect being affected by uneven water distribution. The salt water flowing from top to bottom comes into countercurrent contact with the airflow flowing from bottom to top on the surface of the non-woven fabric to accelerate evaporation. Under the action of the booster pump, the salt water that has not reached the saturation concentration is circulated and evaporated, thus successfully achieving high evaporation efficiency with low energy consumption.

[0023] The further improved technical solution of this invention is as follows:

[0024] Preferably, in the first step, the preset range of airflow speed is 0.5-8m / s; the pulse water spraying cycle is once every 3-30 seconds; and the preset water flow intensity of the pulse water spraying is 0.1-0.8L of water per meter width of nonwoven fabric per hour.

[0025] More preferably, the salt concentration of the saline solution at the outlet of the shell is continuously monitored. When the salt concentration of the saline solution reaches 80-90% of the saturation concentration, a large volume of water is discharged every first predetermined time interval for a second predetermined time interval. The first predetermined time interval is 30-35 minutes, and the second predetermined time interval is 5-7 minutes. The water flow intensity of the large volume of water discharged is 10-11 times the benchmark intensity, using a preset water flow intensity as the baseline. When the salt concentration of the saline solution exceeds 90% of the saturation concentration, the equipment operation is stopped. Since the saline solution concentration is about to reach the saturation concentration, salt crystals will appear on the surface of the nonwoven fabric. The aforementioned intervally large volume of water discharge can dissolve the existing salt crystals on the surface of the nonwoven fabric, thereby improving the subsequent evaporation capacity. When the salt concentration of the saline solution exceeds 90% of the saturation concentration, in order to prevent the saline solution from crystallizing excessively on the nonwoven fabric and causing the equipment to malfunction, the equipment operation is stopped, and the saline solution is transferred to the next process for evaporation and crystallization.

[0026] Preferably, the evaporation process further includes an evaporation equipment optimization step; this optimization step includes: operating the evaporation equipment according to the first and second steps; during operation, continuously supplying air with a humidity of less than 40% into the air inlet of the casing, and continuously monitoring the air humidity at the air outlet of the casing; when the air humidity at the outlet remains stable, calculating the humidity difference between the air humidity at the outlet and the air humidity at the air inlet; if the humidity difference is less than the preset humidity value, increasing the amount of nonwoven fabric used, reducing the spacing between adjacent nonwoven fabrics and ensuring that the spacing between adjacent nonwoven fabrics is at least 2.0 mm, and simultaneously increasing the flow rate of the booster pump, and then repeating the above process; if the humidity difference is greater than or equal to the preset humidity value, the optimization ends; the preset humidity value is 50±5%.

[0027] For example: If the air humidity at the air inlet is 36% and the preset humidity value is 50%, and the air humidity at the air outlet is <86%, then the difference between the air humidity at the air outlet and the air humidity at the air inlet is <the preset humidity value, and further optimization is needed; if the air humidity at the air outlet is ≥86%, then the difference between the air humidity at the air outlet and the air humidity at the air inlet is ≥the preset humidity value, and optimization ends.

[0028] In this way, with the size of the evaporation equipment fixed, the evaporation effect can be improved by increasing the amount of nonwoven fabric used and reducing the spacing between adjacent nonwoven fabrics, so that the evaporation process can meet the expected evaporation efficiency.

[0029] Preferably, the evaporation process further includes an emergency treatment step; the emergency treatment step includes: when adjacent nonwoven fabrics stick together due to salt water, increasing the air speed inside the housing by a fan to accelerate the evaporation of water in the salt water and vibrating the nonwoven fabric at the same time, or reducing the flow rate of the booster pump to reduce the amount of water discharged, or adjusting the position of the tension fixing member to increase the downward pull on the nonwoven fabric until the sticking nonwoven fabrics separate from each other.

[0030] By adopting the above preferred schemes, the specific technical features of the evaporation process can be further optimized.

[0031] Compared with the prior art, the evaporation equipment and process of the present invention uses non-woven fabric as the water carrier, so that the salt water flows from top to bottom along the non-woven fabric. A fan forms an airflow from bottom to top in the shell. The salt water comes into countercurrent contact with the airflow on the surface of the non-woven fabric to accelerate evaporation. At the same time, the salt water is circulated and evaporated under the action of the booster pump, thereby achieving high evaporation efficiency while maintaining low energy consumption. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the evaporation equipment in Embodiment 1 of the present invention.

[0033] Figure 2 This is a side view schematic diagram of the non-woven fabric arrangement inside the evaporation equipment in Embodiment 1 of the present invention. Detailed Implementation

[0034] The present invention will be further described in detail below with reference to the embodiments. However, the present invention is not limited to the examples given.

[0035] Example 1

[0036] like Figure 1 , Figure 2 As shown, this embodiment is specifically designed for evaporation equipment for concentrating brine, including a housing 01 and a booster pump 02; the top or upper part of the housing 01 is provided with an air outlet 03 leading to the outside, and the air outlet 03 is equipped with a fan 04; the bottom of the housing 01 or the lower side wall of the housing 01 is provided with an air inlet 05 communicating with the interior of the housing 01; the housing 01 is provided with a water distribution pipe 06, a set of non-woven fabric 07, and a support frame 08; the water distribution pipe 06 and the support frame 08 are located in the upper part of the housing 01; the top ends of the non-woven fabric 07 are respectively fixed to the support frame. On the support frame 08, the bottom ends of the non-woven fabric 07 are fixedly connected to the tension fixing member 09. The non-woven fabric 07 is in a stretched state under the action of the support frame 08 and the tension fixing member 09. There is a gap between adjacent non-woven fabrics 07. The bottom of the housing 01 is provided with a water collection tank 10 and a water outlet 11, and the water collection tank 10 and the water outlet 11 are connected. The water outlet of the lift pump 02 is connected to the pulse water generator 13 through the first water pipe 12. The pulse water generator 13 is located at the water inlet end of the water distribution pipe 06 and is connected to the water distribution pipe 06. The water distribution pipe 06 is provided with a set of water outlet holes 14, and the diameter of the water outlet holes 14 is 1mm.

[0037] Below the outlet 11 of the housing 01, there is a water collection container 15 for holding salt water, and the inlet of the booster pump 02 is connected to the inside of the water collection container 15 via a second water pipe 16. An alternative option that can be selected as appropriate is: the outlet 11 of the housing 01 is connected to the inlet of the booster pump 02 via a second water pipe 16.

[0038] Specifically, the housing 01 is a vertically arranged cuboid; the non-woven fabric 07 is arranged vertically in parallel. The bottom of the housing 01 is fixed to the support column 17. In addition, the support frame 08 and the water distribution pipe 06 can be combined into one piece.

[0039] The air inlet of the fan 04 is connected to the inside of the casing 01, and the air outlet of the fan 04 is open to the outside.

[0040] The parameters of nonwoven fabric 07 include hydrophilicity coefficient K, deformation coefficient, tensile strength, and thickness.

[0041] Let the hydrophilicity coefficient K = maximum water absorption mass per square meter of nonwoven fabric (in grams) / mass of nonwoven fabric per square meter (in grams), with K ranging from 0.5 to 4.0. The hydrophilicity coefficient K characterizes the hydrophilicity of the nonwoven fabric. If K is below 0.5, the hydrophilicity of the nonwoven fabric is too low, making it difficult for salt water to form a continuous water film on the surface of the nonwoven fabric. The salt water is prone to short-circuiting on the nonwoven fabric and quickly reaches the bottom water collection area, thus making it difficult to guarantee the evaporation effect. If K is above 4.0, the hydrophilicity of the nonwoven fabric is too high, and the surface water film after the nonwoven fabric absorbs water is too thick, making it easier for adjacent nonwoven fabrics to stick together. This necessitates the use of larger nonwoven fabric spacing in the evaporation equipment to reduce the possibility of sticking, thereby significantly reducing the surface area of ​​the nonwoven fabric filled in the evaporation equipment and causing a significant decrease in the evaporation efficiency of the entire device.

[0042] The deformation coefficient of the nonwoven fabric in all directions should be ≤5% (preferably ≤2%). To determine the deformation coefficient, a tensile force of 2-4 kg is applied uniformly to each meter of the nonwoven fabric along the vertical direction, and the percentage increase in fabric length is measured. The result is the deformation coefficient. If the deformation coefficient is too large, the nonwoven fabric structure is weak and easily damaged by tension, leading to short-circuiting of air and water flow, resulting in a significant reduction in evaporation efficiency. Furthermore, the nonwoven fabric is easily damaged, causing the evaporation equipment to malfunction.

[0043] The thickness of nonwoven fabric 07 is 0.2~2mm.

[0044] The spacing between adjacent nonwoven fabrics 07 is 2.0-20mm. This spacing refers to the distance between adjacent surfaces of adjacent nonwoven fabrics 07.

[0045] Under the action of fan 04, an upward airflow with a velocity of 0.5-8 m / s is formed inside casing 01. Maintaining this airflow velocity range within the specified parameters ensures the evaporation efficiency of the evaporation equipment while also considering energy costs. If the airflow velocity is too low, the evaporation efficiency per unit volume of the equipment will be too low, and the investment will be uneconomical; if the airflow velocity is too high, it will lead to excessively high operating energy consumption.

[0046] This embodiment employs the evaporation process of the aforementioned evaporation equipment, including the following steps:

[0047] Step 1: The booster pump 02 draws the brine from the water collection container 15 or the outlet 11 of the shell 01 into the pulse water generator 13. The pulse water generator 13 distributes water to the nonwoven fabric 07 in a pulse water distribution manner through the water distribution pipe 06. At the same time, the fan 04 draws air from the air inlet 05 of the shell to the air outlet 03 of the shell and discharges it to the outside, forming an airflow that flows from bottom to top in the shell 01 and makes the airflow speed reach a preset range. The brine flows from top to bottom along the nonwoven fabric 07 and comes into contact with the airflow in the opposite direction to accelerate evaporation.

[0048] The preset range of airflow speed is 0.5-8m / s; the pulse water spraying cycle is once every 3-30 seconds; the preset water flow intensity of the pulse water spraying is 0.1-0.8L per hour per meter width of non-woven fabric 07.

[0049] Furthermore, when the salt concentration of the saline solution is 80-90% of the saturation concentration, a large volume of water is discharged at first predetermined intervals for a second predetermined interval, with the first predetermined interval being 32 minutes and the second predetermined interval being 6 minutes. The water flow intensity of the large volume discharge is 10 times the preset flow intensity. Since the saline solution concentration is approaching saturation, salt crystals will appear on the surface of the nonwoven fabric. The aforementioned intervally large volume of water discharge can dissolve the existing salt crystals on the nonwoven fabric surface, thereby improving subsequent evaporation capacity. When the salt concentration of the saline solution exceeds 90% of the saturation concentration, to prevent excessive crystallization on the nonwoven fabric that would render the equipment unusable, the equipment is stopped, and the saline solution is transferred to subsequent processes for evaporation and crystallization.

[0050] The second step involves the saline solution flowing downwards along the non-woven fabric 07 to the bottom and collecting in the water collection tank 10 at the bottom of the shell 01. Then, it flows into the water collection container 15 through the water outlet 11 of the shell 01 (or is directly drawn by the lift pump 02 through the water outlet 11 of the shell 01), so that the saline solution with a salt concentration below 90% of the saturation concentration forms a circulating evaporation.

[0051] In this embodiment, the evaporation process further includes an evaporation equipment optimization step. This optimization step includes: operating the evaporation equipment according to steps one and two; during operation, continuously supplying air with a humidity of less than 40% into the housing inlet and continuously monitoring the air humidity at the housing outlet; once the outlet air humidity stabilizes, calculating the humidity difference between the outlet and inlet air humidity; if the humidity difference is less than a preset humidity value, increasing the amount of nonwoven fabric used, reducing the spacing between adjacent nonwoven fabrics and ensuring the spacing is at least 2.0 mm, and simultaneously increasing the flow rate of the booster pump, then repeating the above process; if the humidity difference is greater than or equal to the preset humidity value, the optimization ends; the preset humidity value is 50±5%.

[0052] In this embodiment, the evaporation process also includes an emergency treatment step; the emergency treatment step includes: when adjacent nonwoven fabrics stick together due to salt water, increasing the wind speed inside the housing by using a fan to accelerate the evaporation of water in the salt water and simultaneously vibrating the nonwoven fabrics, or reducing the flow rate of the booster pump to reduce the amount of water discharged, or adjusting the position of the tension fixing member to increase the downward pulling force on the nonwoven fabrics until the sticking nonwoven fabrics separate from each other.

[0053] Specific implementation examples and comparisons of this embodiment are as follows.

[0054] Example 1:

[0055] Dimensions of the evaporation equipment: shell length 0.28 meters, shell width 0.28 meters, shell height 3.0 meters, support column height 0.40 meters, total equipment height 3.40 meters.

[0056] Nonwoven fabric parameters: length 2.75 meters, width 0.26 meters, approximately 80 grams per square meter, thickness approximately 0.30 mm. Note: Nonwoven fabric is a commercially available product. Under current technology, nonwoven fabric suppliers can provide the corresponding nonwoven fabric according to the above parameters and specifications.

[0057] The nonwoven fabric has a spacing of 4.5 mm and a total length of 2.90 meters after stretching; the total area of ​​nonwoven fabric used is 36.95 square meters. The hydrophilicity coefficient K of the nonwoven fabric is 2.0, and the deformation coefficient in each direction is 2%.

[0058] Fan parameters: Air volume 670m³ 3 / h, operating power 0.03Kw.

[0059] The water distribution pipe and support frame are integrated and integrally formed. The diameter of the water distribution holes on the water distribution pipe is 1mm. The water distribution pipe sprays water evenly in pulses, with a pulse water spraying cycle of once every 3-30 seconds.

[0060] The indoor environment during operation was as follows: ventilation fans and doors and windows were open. It was calculated that the ventilation volume during the test was greater than 8000 m³. 3 / h (ventilation volume includes the air volume of the ventilation fan and the air volume entering and leaving the doors and windows). The air volume of the ventilation fan is more than twice that of the evaporation equipment fan. This helps to maintain the outdoor air humidity indoors and prevents the indoor air humidity from accumulating and increasing.

[0061] The experimental parameters and operating results of this example are shown in the table below.

[0062]

[0063] Note: "Power consumption per ton of water blower" refers to the power consumption of the blower required to evaporate one ton of water, calculated based on actual operating data, and the same applies below.

[0064] Example 2:

[0065] This example is basically the same as Example 1, with the only difference being the experimental parameters and the running results.

[0066] The experimental parameters and operating results of this example are shown in the table below.

[0067]

[0068] Comparative Example 1:

[0069] This comparative example is basically the same as Example 1, except that the hydrophilicity coefficient K of the nonwoven fabric used in this comparative example is 0.4.

[0070] The experimental parameters and operational results of this comparative example are shown in the table below.

[0071]

[0072] The results above show that because the hydrophilicity coefficient K of the nonwoven fabric is too low (i.e., the hydrophilicity of the nonwoven fabric is too low), it is very easy for the salt water content on some of the nonwoven fabric surfaces to be uneven, which causes short-circuiting of the salt water content on the nonwoven fabric surface, resulting in insufficient contact between the airflow and the salt water content, a significant reduction in evaporation, and thus a significant increase in the electricity consumption per ton of water evaporation.

[0073] Comparative Example 2:

[0074] This comparative example is basically the same as Example 1, except that the hydrophilicity coefficient K of the nonwoven fabric used in this comparative example is 6.5.

[0075] The experimental parameters and operational results of this comparative example are shown in the table below.

[0076]

[0077] The results above show that an excessively high hydrophilicity coefficient K (i.e., excessively high hydrophilicity of the nonwoven fabric) leads to decreased evaporation efficiency and excessive energy consumption. Inspection of the equipment's internal components revealed that the excessive hydrophilicity of the nonwoven fabric caused extensive adhesion between the fabric strands, resulting in a significant decrease in the equipment's evaporation efficiency.

[0078] Comparative Example 3:

[0079] This comparative example is basically the same as Example 1, except that the deformation coefficient of the nonwoven fabric in each direction is 10% in this comparative example.

[0080] The experimental parameters and operational results of this comparative example are shown in the table below.

[0081]

[0082] The results above show that an excessively large deformation coefficient of the nonwoven fabric not only causes unevenness throughout the fabric but also makes it difficult to ensure the spacing between the nonwoven fabric sections. Under the action of water flow on the surface of the nonwoven fabric, there is a lot of adhesion between the fabric sections, which leads to a serious uneven distribution of water and air, ultimately resulting in a significant decrease in evaporation efficiency.

[0083] Comparative Example 4:

[0084] This comparative example is basically the same as Example 1, except that the thickness of the nonwoven fabric used in this comparative example is 3.5mm.

[0085] The experimental parameters and operational results of this comparative example are shown in the table below.

[0086]

[0087] The results above show that the evaporation efficiency of this comparative example decreased significantly, the water distribution pipes exhibited severe bending, the non-woven fabric inside the equipment showed severe adhesion, the air passage area was greatly reduced, and the fan airflow at the shell outlet was significantly reduced (to approximately 450 m³ / h). 3 The reason for this is that the non-woven fabric is too thick, occupying a large amount of space and reducing the airflow space, resulting in excessive air resistance and a significant reduction in fan airflow. Furthermore, the excessive thickness of the non-woven fabric means it lacks elasticity, and some parts are not in a stretched state, making them prone to sticking together under the influence of saline solution. The combined effect of these factors leads to a substantial decrease in the equipment's evaporation efficiency.

[0088] In addition to the embodiments described above, the present invention may have other implementations. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. An evaporation device specifically designed for concentrating brine, comprising a shell and a booster pump; characterized in that, The top or upper part of the housing has an air outlet leading to the outside, and the air outlet is equipped with a fan. The bottom or lower side wall of the housing has an air inlet communicating with the interior of the housing. The housing contains a water distribution pipe, a set of non-woven fabric, and a support frame. The water distribution pipe and the support frame are located in the upper part of the housing. The top ends of the non-woven fabric are respectively fixed to the support frame, and the bottom ends of the non-woven fabric are respectively fixedly connected to the tension fixing member. The non-woven fabric is in a stretched state under the action of the support frame and the tension fixing member. There is a gap between adjacent non-woven fabrics. The bottom of the housing has a water collection tank and a water outlet, and the water collection tank is connected to the water outlet. The water outlet of the lifting pump is connected to the pulse water generator through a first water pipe. The pulse water generator is located at the water inlet end of the water distribution pipe and is connected to the water distribution pipe. The shell has a water collection container for holding salt water below the water outlet, and the water inlet of the booster pump is connected to the inside of the water collection container via a second water pipe; or, the water outlet of the shell is connected to the water inlet of the booster pump via a second water pipe. The parameters of the nonwoven fabric include the hydrophilicity coefficient K, the deformation coefficient, and the thickness; wherein, the hydrophilicity coefficient K is set to the maximum water absorption mass per square meter of nonwoven fabric / the mass of nonwoven fabric per square meter, and the hydrophilicity coefficient K of the nonwoven fabric is 0.5~4.0; the deformation coefficient of the nonwoven fabric in each direction is ≤5%; the thickness of the nonwoven fabric is 0.2~2mm; and the spacing between adjacent nonwoven fabrics is at least 2.0mm.

2. The evaporation equipment specifically for concentrating brine according to claim 1, characterized in that, The shell is a cuboid arranged vertically; the group of nonwoven fabrics is arranged in parallel vertically.

3. An evaporation device specifically for concentrating brine according to claim 1, characterized in that, The air inlet of the fan is connected to the inside of the casing, and the air outlet of the fan is open to the outside.

4. An evaporation device specifically for concentrating brine according to claim 1, characterized in that, The deformation coefficient of the nonwoven fabric in each direction is ≤2%; the spacing between adjacent nonwoven fabrics is 2.0-20mm.

5. An evaporation device specifically for concentrating brine according to claim 1, characterized in that, Under the action of the fan, an airflow with a speed of 0.5-8m / s is formed inside the casing, flowing upwards from bottom to top.

6. An evaporation apparatus specifically for concentrating brine according to any one of claims 1 to 5, characterized in that, The support frame and the water distribution pipe are integrated and integrally formed; or, the bottom of the housing is fixed on the support column; or, the water distribution pipe is provided with a set of water outlet holes, and the diameter of the water outlet holes is 0.2-2.5mm.

7. An evaporation process specifically for concentrating brine, characterized in that, An evaporation apparatus specifically designed for concentrating brine, as described in any one of claims 1 to 6, is used; the evaporation process includes the following steps: Step 1: The booster pump draws the brine from the outlet of the water collection container or shell into the pulse water generator. The pulse water generator distributes water to the non-woven fabric in a pulse water output manner through the water distribution pipe. At the same time, the fan draws air from the air inlet of the shell to the air outlet of the shell and discharges it to the outside, forming an airflow that flows from bottom to top inside the shell, and the airflow speed reaches a preset range. The brine flows from top to bottom along the non-woven fabric and comes into contact with the airflow in the opposite direction to accelerate evaporation. The second step involves the saline solution flowing downwards along the non-woven fabric to the bottom and collecting in the water collection tank at the bottom of the shell. It then flows into the water collection container through the outlet of the shell or is directly drawn by the booster pump, allowing the saline solution with a salt concentration below 90% of the saturation concentration to circulate and evaporate.

8. An evaporation process for concentrating saline solution according to claim 7, characterized in that, in the first step, the preset range of airflow velocity is 0.5-8 m / s; the pulse water outlet cycle is once every 3-30 seconds; and the preset water flow intensity of the pulse water outlet is 0.1-0.8 L of water per meter width of nonwoven fabric per hour.

9. An evaporation process specifically for concentrating brine according to claim 8, characterized in that, The salt concentration of the saline solution at the outlet of the shell is continuously monitored. When the salt concentration of the saline solution is 80-90% of the saturation concentration, a large volume of water is discharged for a duration of 30-35 minutes and 5-7 minutes at a time interval of 30-35 minutes. The water flow intensity of the large volume of water is 10-11 times that of the preset water flow intensity. When the salt concentration of the saline solution is greater than 90% of the saturation concentration, the equipment operation is stopped.

10. An evaporation process specifically for concentrating brine according to claim 7, characterized in that, The evaporation process also includes an evaporation equipment optimization step; The optimization steps for this evaporation equipment include: operating the evaporation equipment according to steps one and two; during operation, continuously supplying air with a humidity of less than 40% into the air inlet of the casing, and continuously monitoring the air humidity at the air outlet of the casing; once the air humidity at the outlet remains stable, calculating the humidity difference between the air humidity at the outlet and the air humidity at the air inlet; if the humidity difference is less than the preset humidity value, increasing the amount of non-woven fabric used, reducing the spacing between adjacent non-woven fabrics and ensuring that the spacing between adjacent non-woven fabrics is at least 2.0 mm, and simultaneously increasing the flow rate of the booster pump, then repeating the above process; if the humidity difference is greater than or equal to the preset humidity value, the optimization ends; the preset humidity value is 50±5%.

11. An evaporation process specifically for concentrating brine according to claim 7, characterized in that, The evaporation process also includes an emergency treatment step; The emergency handling steps include: when adjacent nonwoven fabrics stick together due to salt water, increasing the air speed inside the housing by using a fan to accelerate the evaporation of water in the salt water and simultaneously vibrating the nonwoven fabrics, or reducing the flow rate of the booster pump to reduce the amount of water discharged, or adjusting the position of the tension fixing member to increase the downward pull on the nonwoven fabrics until the sticking nonwoven fabrics separate from each other.

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