Wastewater treatment equipment for aerogel felt production and process thereof

Abstract

The invention discloses wastewater treatment equipment for aerogel felt production and a control system thereof, and relates to the field of industrial wastewater treatment. According to the wastewater treatment equipment for aerogel felt production and the control system thereof, the slag removal unit, the evaporation unit and the neutralization unit are arranged as hardware implementation conditions, and meanwhile, the corresponding control system is designed in a matched manner, so that the wastewater treatment equipment is controlled by the control system; automatic waste residue fishing, automatic continuous distillation recovery of an organic solvent in waste liquid and intelligent step-by-step gradient neutralization of an acid solution in the waste liquid are realized, so that the acid liquid can be continuously neutralized and produced, and the produced neutral waste liquid enters the evaporation unit to be evaporated and crystallized; steam generated by evaporation is used for providing heat energy for the distillation mechanism, so that the whole wastewater treatment process has full-automatic and continuous effects, the recovery rate of the organic solvent is high, and the cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial wastewater treatment, and particularly to a wastewater treatment device and its control system for the production of aerogel felts. Background Technique

[0002] An aerogel felt is a flexible thermal insulation material made with an aerogel as the matrix and combined with fiber reinforcing materials. It has characteristics such as an ultra-low thermal conductivity, light weight, and fire resistance, and is widely used in fields such as construction, industrial insulation, and aerospace. During the production process, the impregnation method is usually adopted, where the fiber material is immersed in the aerogel sol. After the aerogel completely infiltrates the fiber material, the material is taken out for gel aging.

[0003] However, during the entire production process, a large amount of industrial wastewater is generated. In addition to containing some fiber debris, the wastewater also contains a large amount of organic solvents and acidic wastewater. In the existing process, usually, the organic solvents are first separated and recovered by distillation, then the waste residue is filtered, and finally acid-base neutralization is carried out, and then the salts after neutralization are extracted. However, the existing entire treatment process is usually a non-continuous operation, with low efficiency, high difficulty, and relatively high costs. Therefore, a wastewater treatment device and its control system for the production of aerogel felts are specifically provided. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a wastewater treatment device and its control system for the production of aerogel felts, which solves the problems of non-continuous operation, low efficiency, high difficulty, and relatively high costs in the treatment of wastewater generated during the production of existing aerogel felts.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A wastewater treatment device for the production of aerogel felts, including:

[0006] A slag removal unit, which removes fiber floating slag in the wastewater through filtration;

[0007] An evaporation unit, which includes a distillation mechanism at the top and an evaporation and crystallization mechanism at the bottom. The distillation mechanism has two groups and is connected up and down. The upper distillation mechanism is connected to the slag removal unit and is used for the distillation separation of acetone. The lower distillation mechanism is used for the distillation separation of ethanol. The evaporation and crystallization mechanism is used for the evaporation and recovery of crystalline salts from the neutralized acidic wastewater. The steam generated during the evaporation process of the evaporation and crystallization mechanism is used to provide heat energy for the upper distillation mechanism;

[0008] A neutralization unit, whose feed end is connected to the distillation mechanism and whose discharge end is connected to the evaporation and crystallization mechanism; the neutralization unit consists of multiple neutralization chambers, and communication holes are provided between the multiple neutralization chambers, and a pH sensor is provided in the communication holes; a rotating roller is provided inside the neutralization chamber, and the rotating roller is used to add an alkaline neutralizing solution into the neutralization chamber and mix and stir at the same time;

[0009] A control unit, which is used to control the slag removal unit, the evaporation unit and the neutralization unit.

[0010] Preferably, the slag removal unit includes:

[0011] A slag pool;

[0012] A main slag removal part, which is arranged at the feed end of the slag pool and is used to intercept large filter residues and clean them outside the slag pool;

[0013] A lift pump, which is fixedly arranged at the discharge end of the slag pool, and the output end of the lift pump is connected to the distillation mechanism;

[0014] A passive filter part, which is fixedly arranged at the feed port of the lift pump and is used to block fine crushed residues.

[0015] Preferably, the main slag removal part includes:

[0016] A slag blocking plate, which is fixedly arranged in the slag pool. The slag blocking plate is integrally in an inverted "V" shape, and one end of the slag blocking plate far from the feed end of the slag pool is inclined upward;

[0017] A slag discharge port, which is integrally formed on both sides of the end of the slag blocking plate;

[0018] A conveyor belt, which is suspended and fixedly arranged on the tops of both sides of the slag blocking plate;

[0019] Scrapers, which are fixedly distributed equidistantly on the surface of the conveyor belt, and the bottom of the scrapers is in contact with the top of the slag blocking plate and is used to push the floating slag towards one end of the slag discharge port.

[0020] Preferably, a heat preservation layer is arranged outside the distillation mechanism. The evaporation and crystallization mechanism includes an evaporation chamber arranged at the inner bottom of the heat preservation layer and an electric heating coil arranged in the evaporation chamber. The top of the evaporation chamber is fixedly connected and provided with a steam discharge pipe. The steam discharge pipe penetrates through the distillation mechanism. The steam discharge pipe consists of an upward section and a downward section, and the top ends of the upward section and the downward section are connected and communicated, and the bottom end of the downward section extends outside the heat preservation layer.

[0021] Preferably, the distillation mechanism includes:

[0022] Two groups of A tanks and B tanks for preheating;

[0023] A distillation chamber, which is fixedly arranged at the bottoms of Tank A and Tank B, and a steam discharge port for connecting a condenser pipe is installed on the side of the top end of the distillation chamber. The bottom end of the lowermost group of the distillation chambers is connected to the neutralization unit;

[0024] A plurality of solenoid valves, which are respectively fixedly arranged at the upper and lower ends of Tank A and Tank B;

[0025] A plurality of steam coils, which are respectively fixedly arranged inside Tank A, Tank B and the distillation chamber, and a steam flow valve is installed between the intake end of the steam coil and the downward section of the steam discharge pipe;

[0026] A condensate drain pipe, the bottom end of which is connected to the bottom end of the steam discharge pipe, and the output end of the steam coil is connected to the condensate drain pipe;

[0027] A spray tray, which is fixedly arranged at the inner top of the distillation chamber, and the bottoms of Tank A and Tank B are connected to the spray tray through solenoid valves.

[0028] Preferably, the neutralization unit further includes:

[0029] A neutralization tank;

[0030] Partition plates, which are fixedly arranged equidistantly in the neutralization chamber for partitioning the neutralization tank into a plurality of the neutralization chambers, and communication holes are opened on the partition plates;

[0031] A feed spray rack, which is fixedly installed at the front end of the neutralization tank and is connected to the lowermost distillation chamber;

[0032] An alkali solution tank, which is fixedly arranged on the outer wall of the neutralization tank and is connected to a roller;

[0033] A stirring motor, which is fixedly arranged on the outer wall of the neutralization tank and is in transmission connection with the roller;

[0034] A discharge pump, the input end of which is connected to the end of the neutralization tank, and the output end of which is connected to the evaporation chamber;

[0035] A water stop valve, which is arranged on the partition plate for blocking or exposing the communication hole.

[0036] Preferably, spray heads and blades are arranged at intervals on the outer wall of the roller, an alkali solution addition pump is fixedly arranged on the outer wall of the neutralization tank, and the end of the roller is rotationally sealed and assembled with the output end of the alkali solution addition pump; the input end of the alkali solution addition pump is connected to the alkali solution tank.

[0037] Preferably, the water stop valve includes a water stop baffle slidably arranged on the outer wall of the partition plate and an electric telescopic cylinder fixedly arranged on the partition plate, and the output end of the electric telescopic cylinder is fixedly connected to the partition plate.

[0038] Preferably, the number of communication holes on the partition board is multiple groups and is linearly horizontally distributed; the communication holes on multiple groups of partition boards are arranged in an up-and-down staggered manner, and an "S"-shaped water flow line is formed between multiple neutralization chambers through the communication holes on multiple groups of partition boards.

[0039] Preferably, a control system for controlling the wastewater treatment equipment for aerogel felt production includes the following modules:

[0040] A control core, which is a control unit;

[0041] A slag removal module, which controls the movement of the conveyor belt through the control unit to remove slag and then pumps the slag removal wastewater into the evaporation unit through a lift pump;

[0042] An evaporation module, including a solenoid valve and a steam flow valve, and also including temperature sensors and liquid level sensors arranged inside the A tank and the B tank. The liquid level height is monitored through the liquid level sensor, and the temperature value is monitored through the temperature sensor. When the liquid level height and the temperature value reach the threshold, liquid is sprayed into the distillation chamber, so that the target distillation product is atomized and distilled out of the distillation chamber within a specified temperature range;

[0043] A neutralization module, including a PH sensor, a stirring motor, a water stop valve, and an alkali liquid addition pump. The pH value of the liquid flowing between two neutralization chambers is monitored through the PH sensor. When the pH value is detected to be alkaline, the water stop valve and the alkali liquid addition pump are closed, and neutralization is carried out after the acid liquid continues to flow in; when the PH value is detected to be acidic, according to the average acidity value and the multi-point PH difference, the alkali liquid addition pump and the stirring motor are adjusted respectively, so as to overcome the problems of large acidity strength and acidity difference caused by insufficient alkali liquid and uneven mixing.

[0044] The present invention discloses a wastewater treatment equipment for aerogel felt production and its control system, and the beneficial effects thereof are as follows:

[0045] 1. For the wastewater treatment equipment for aerogel felt production, fiber waste residues are filtered through the slag removal unit, organic solvents are extracted and recovered by stage-by-stage distillation through the evaporation unit, and at the same time, the evaporation chamber at the bottom is used for evaporating and crystallizing the neutralized wastewater to obtain crystal salts, and the steam generated by evaporation heats the distillation mechanism above, realizing effective utilization of heat. At the same time, the wastewater is neutralized stage by stage through the neutralization unit, and the whole process is continuous, with high efficiency and low energy consumption.

[0046] 2. For the control system of the wastewater treatment equipment for aerogel felt production, the whole distillation mechanism is controlled through the evaporation module, so that the A tank and the B tank can automatically preheat the waste liquid to the target distillation temperature alternately and then distill and discharge the target distillation product. The degree of automation is high, the process is continuous, and the overall separation speed and recovery rate of organic substances are effectively improved.

[0047] 3. The wastewater treatment equipment and control system for the production of aerogel felt control the neutralization unit through the neutralization module, enabling continuous acid-base neutralization in multiple neutralization chambers. For multiple neutralization chambers, their threshold S1 is different. From the first-level neutralization chamber to the N-level neutralization chamber, the threshold S1 gradually approaches 7. As a result, after multiple rounds of alkali solution addition and stirring and mixing of the waste liquid, the overall pH value finally approaches 7, thus meeting the discharge requirements. Through the pH threshold S1 in each neutralization chamber, multiple neutralization chambers can automatically conduct comprehensive analysis based on the pH of the waste liquid in different communication holes, thereby adaptively adjusting the alkali solution addition amount and stirring speed, avoiding the problem that the overall pH value does not meet the discharge requirements to the next level due to unreasonable alkali solution amount and uneven mixing. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0049] Figure 1 Schematic diagram of the overall outer surface structure of the present invention;

[0050] Figure 2 Schematic diagram of the overall back structure of the present invention;

[0051] Figure 3 Schematic diagram of the slag removal unit structure of the present invention;

[0052] Figure 4 Cross-sectional view of the internal structure of the slag pool of the present invention;

[0053] Figure 5 Schematic diagram of the neutralization unit structure of the present invention;

[0054] Figure 6 Cross-sectional view of the internal structure of the neutralization tank of the present invention;

[0055] Figure 7 Cross-sectional view of the internal structure of the evaporation unit of the present invention;

[0056] Figure 8 Schematic diagram of the outer surface structure of the distillation mechanism of the present invention;

[0057] Figure 9 Schematic diagram of the structure of the functional framework diagram of the control system of the present invention;

[0058] Figure 10 Control flow chart of the evaporation module of the present invention;

[0059] Figure 11 This is the control flow chart of the neutralization module in the present invention.

[0060] In the figure: 1. Dross removal unit; 11. Dross pool; 12. Active dross removal part; 121. Dross retaining plate; 122. Discharge port; 123. Conveyor belt; 124. Scraper; 13. Lift pump; 14. Passive filter part; 2. Evaporation unit; 21. Heat preservation layer; 22. Distillation mechanism; 221. Tank A; 222. Tank B; 223. Distillation chamber; 224. Solenoid valve; 225. Steam coil; 226. Condensate drain pipe; 227. Spray tray; 23. Evaporation chamber; 24. Electric heating coil; 25. Steam discharge pipe; 3. Neutralization unit; 31. Neutralization tank; 32. Feed spray rack; 33. Roller; 34. Alkali solution tank; 35. Alkali solution addition pump; 36. Electric telescopic cylinder; 37. Water stop baffle; 38. Discharge pump; 39. Stirring motor; 310. Partition board; 311. Nozzle; 312. Paddle; 313. Communication hole; 4. Control unit. Specific embodiments

[0061] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0062] By providing a wastewater treatment device for aerogel felt production and its control system in the embodiments of the present application, the problems existing in the treatment of wastewater generated in the existing aerogel felt production process, such as non - continuous operation, low efficiency, high difficulty, and relatively high cost, are solved.

[0063] To better understand the above - mentioned technical solutions, the above - mentioned technical solutions will be described in detail below in conjunction with the specification drawings and specific embodiments.

[0064] Embodiment 1

[0065] An embodiment of the present invention discloses a wastewater treatment device for aerogel felt production.

[0066] According to the attached Figures 1-11 As shown, it includes:

[0067] A dross removal unit 1, which removes fiber dross in the wastewater by filtration;

[0068] Evaporation unit 2, which includes a distillation mechanism 22 at the top and an evaporation and crystallization mechanism at the bottom. The distillation mechanism 22 has two sets and is connected up and down. The upper distillation mechanism 22 is connected to the slag removal unit 1 for acetone distillation separation. The lower distillation mechanism 22 is used for ethanol distillation separation. The evaporation and crystallization mechanism is used for evaporating and recovering crystal salts from the neutralized acidic wastewater. The steam generated during the evaporation process of the evaporation and crystallization mechanism is used to provide heat energy for the upper distillation mechanism 22.

[0069] Neutralization unit 3, whose feed end is connected to the distillation mechanism 22 and whose discharge end is connected to the evaporation and crystallization mechanism. The neutralization unit 3 consists of multiple neutralization chambers. There are communication holes 313 between the multiple neutralization chambers, and a pH sensor is arranged in the communication holes 313. Inside the neutralization chamber, there is a rotating roller 33, which is used to add alkaline neutralizing liquid into the neutralization chamber and mix and stir at the same time.

[0070] Control unit 4, which is used to control the slag removal unit 1, evaporation unit 2 and neutralization unit 3.

[0071] The slag removal unit 1 includes a slag pool 11, an active slag removal part 12, a lift pump 13 and a passive filter part 14. The active slag removal part 12 is arranged at the feed end of the slag pool 11 for intercepting large filter residues and cleaning them outside the slag pool 11. The lift pump 13 is fixedly arranged at the discharge end of the slag pool 11, and the output end of the lift pump 13 is connected to the distillation mechanism 22. The passive filter part 14 is fixedly arranged at the feed port of the lift pump 13 for blocking fine broken slag. The passive filter part 14 adopts a cylindrical filter and filters through multiple layers of non-woven fabrics arranged inside.

[0072] The active slag removal part 12 includes a slag blocking plate 121, a slag discharge port 122, a conveyor belt 123 and a scraper 124. The slag blocking plate 121 is fixedly arranged in the slag pool 11. The slag blocking plate 121 is integrally in an inverted "V" shape, and the end of the slag blocking plate 121 far from the feed end of the slag pool 11 slopes upward. The slag discharge ports 122 are integrally formed on both sides of the end of the slag blocking plate 121. The conveyor belt 123 is fixedly suspended on both sides of the top of the slag blocking plate 121. The scrapers 124 are fixedly distributed at equal intervals on the surface of the conveyor belt 123, and the bottom of the scraper 124 is in contact with the top of the slag blocking plate 121 for pushing the floating slag towards the slag discharge port 122.

[0073] The outside of the distillation mechanism 22 is provided with a heat preservation layer 21. The evaporation and crystallization mechanism includes an evaporation chamber 23 arranged at the inner bottom of the heat preservation layer 21 and an electric heating coil 24 arranged in the evaporation chamber 23. The top of the evaporation chamber 23 is fixedly connected and provided with a steam discharge pipe 25. The steam discharge pipe 25 penetrates through the distillation mechanism 22. The steam discharge pipe 25 consists of an upward section and a downward section, and the top ends of the upward section and the downward section are connected. The bottom end of the downward section extends outside the heat preservation layer 21.

[0074] The distillation mechanism 22 includes two groups of A tanks 221 and B tanks 222 for preheating, a distillation chamber 223, multiple solenoid valves 224, multiple steam coils 225, a condensate drain pipe 226, and a spray tray 227. The distillation chamber 223 is fixedly arranged at the bottoms of the A tank 221 and the B tank 222, and a steam discharge port for connecting a condensate pipe is installed on the top side of the distillation chamber 223. The bottom end of the lowermost group of distillation chambers 223 is connected to the neutralization unit 3; multiple solenoid valves 224 are respectively fixedly arranged at the upper and lower ends of the A tank 221 and the B tank 222; multiple steam coils 225 are respectively fixedly arranged inside the A tank 221, the B tank 222, and the distillation chamber 223, and a steam flow valve is installed between the inlet end of the steam coil 225 and the downward section of the steam discharge pipe 25; the condensate drain pipe 226, its bottom end is connected to the bottom end of the steam discharge pipe 25, and the output end of the steam coil 225 is connected to the condensate drain pipe 226; the spray tray 227 is fixedly arranged at the inner top of the distillation chamber 223, and the bottom ends of the A tank 221 and the B tank 222 are connected to the spray tray 227 through the solenoid valve 224.

[0075] The neutralization unit 3 further includes a neutralization tank 31, a partition plate 310, a feed spray rack 32, a lye tank 34, a stirring motor 39, a discharge pump 38, and a water stop valve. The partition plate 310 is fixedly arranged at equal intervals in the neutralization chamber for dividing the neutralization tank 31 into multiple neutralization chambers, and a communication hole 313 is opened on the partition plate 310; the feed spray rack 32 is fixedly erected at the front end of the neutralization tank 31 and is connected to the bottom distillation chamber 223; the lye tank 34 is fixedly arranged on the outer wall of the neutralization tank 31 and is connected to the roller 33; the stirring motor 39 is fixedly arranged on the outer wall of the neutralization tank 31 and is drivingly connected to the roller 33; the input end of the discharge pump 38 is connected to the end of the neutralization tank 31, and its output end is connected to the evaporation chamber 23; the water stop valve is arranged on the partition plate 310 for blocking or exposing the communication hole 313.

[0076] Nozzles 311 and blades 312 are arranged at intervals on the outer wall of the roller 33. A lye addition pump 35 is fixedly arranged on the outer wall of the neutralization tank 31, and the end of the roller 33 is rotationally sealed and assembled with the output end of the lye addition pump 35; the input end of the lye addition pump 35 is connected to the lye tank 34.

[0077] The water stop valve includes a water stop baffle 37 slidably arranged on the outer wall of the partition plate 310 and an electric telescopic cylinder 36 fixedly arranged on the partition plate 310. The output end of the electric telescopic cylinder 36 is fixedly connected to the partition plate 310.

[0078] The number of communication holes 313 on the partition plate 310 is multiple groups and is linearly horizontally distributed; the communication holes 313 on multiple groups of partition plates 310 are arranged in an up-and-down staggered manner, and an "S"-shaped water flow line is formed between multiple neutralization chambers through the communication holes 313 on multiple groups of partition plates 310.

[0079] Working principle: When the device is in use, wastewater containing fiber residues, organic solvents, and acid solution is introduced from the feed end of the slag pool 11. At this time, the wastewater falls onto the slag retaining plate 121 to intercept the larger-sized slag residues. Meanwhile, by starting the conveyor belt 123, the scraper 124 moves upward along the surface of the slag retaining plate 121 to scrape the slag material to the slag discharge port 122. At this time, under the action of gravity, the slag material slides outwards from the slag discharge port 122, thus realizing continuous cyclic removal of waste slag. At the same time, some fine slag residues follow the waste liquid through the slag retaining plate 121. At this time, the fine slag residues are filtered by the passive filter element 14, and then the waste liquid is lifted to the top of the evaporation unit 2 by the lift pump 13;

[0080]

[0080]

[0081] Then the waste liquid enters the interiors of the A tank 221 and the B tank 222 and is heated by the steam coils 225 inside. Since the organic solvents in the waste liquid mainly include acetone and ethanol, and the atmospheric distillation temperature of acetone is about 56 °C, when the temperature in the upper A tank 221 and B tank 222 is heated to 56 °C, the solenoid valve 224 at the bottom thereof opens to inject water into the spray tray 227 in the lower distillation chamber 223. The spray tray 227 sprays the 56 °C mixed solution into the distillation chamber 223, enabling acetone to be evaporated first. The vaporized acetone is discharged outwards through the steam discharge port on one side. By connecting a condensing pipe to the steam discharge port, the evaporated and discharged acetone is condensed and recovered;

[0082] The recycled waste liquid is sprayed into the interior of the neutralization tank 31 through the feed spray rack 32. The neutralization tank 31 is divided into multiple neutralization chambers by a plurality of partition plates 310. A rotating roller 33 is provided in each neutralization chamber. During use, the wastewater first enters the first neutralization chamber. The rotating roller 33 drives the paddle 312 and the nozzle 311 to rotate. At the same time, the lye addition pump 35 pumps the lye in the lye tank 34 into the nozzle 311, so as to realize the synchronous addition and mixing and stirring of the lye, achieve preliminary neutralization, and thus increase the overall pH value. Then the mixed liquid enters the next-level neutralization chamber through the communication hole 313, and then secondary lye addition and mixing are carried out, so that the overall acidic waste liquid undergoes multiple rounds of gradual addition and mixing of lye. Finally, the pH value of the overall waste liquid approaches 7, making the waste liquid neutral. Then the neutralized material is pumped into the evaporation chamber 23 by the discharge pump 38 and heated and evaporated by the electric heating coil 24. The water is evaporated and discharged upward through the steam discharge pipe 25. Finally, crystalline salts are formed at the bottom of the evaporation chamber 23. The evaporated steam enters the steam coil 225 through the steam discharge pipe 25 to provide heat for the distillation mechanism 22 above the evaporation chamber 23. Finally, after the steam temperature drops, it is discharged from the end of the steam discharge pipe 25, so as to realize the effective utilization of heat, reduce costs, and the whole process is continuous, efficient, and highly automated.

[0083] Example Two

[0084] The embodiment of the present invention discloses a control system for wastewater treatment equipment for the production of aerogel felt.

[0085] According to the appendix Figures 1-11 shown, it includes the following modules:

[0086] The control core, which is the control unit 4;

[0087] The slag removal module controls the movement of the conveyor belt 123 through the control unit 4 to remove slag, and then pumps the slag removal wastewater into the evaporation unit 2 through the lift pump 13;

[0088] The evaporation module includes a solenoid valve 224 and a steam flow valve, and also includes temperature sensors and liquid level sensors arranged inside the A tank 221 and the B tank 222. The liquid level height is monitored by the liquid level sensor, and the temperature value is monitored by the temperature sensor. When the liquid level height and the temperature value reach the threshold, liquid is sprayed into the distillation chamber, so that the target distillation product is atomized and distilled out of the distillation chamber within the specified temperature range;

[0089] The neutralization module includes a pH sensor, a stirring motor 39, a water stop valve, and an alkali solution addition pump 35. The pH value of the liquid flowing between the two neutralization chambers is monitored by the pH sensor. When the pH value is detected to be alkaline, the water stop valve and the alkali solution addition pump 35 are closed, and the acid solution is allowed to continue flowing in for neutralization. When the pH value is detected to be acidic, the alkali solution addition pump 35 and the stirring motor 39 are adjusted respectively according to the average acidity value and the multi-point pH difference, so as to overcome the problems of large acidity strength and acidity difference caused by insufficient alkali solution and uneven mixing.

[0090] Working principle; The control core of the control system is the control unit 4, which is essentially an industrial computer. It is connected to the conveyor belt 123 and the lift pump 13 in the slag removal unit 1 to control the slag removal unit 1 to discharge slag and waste liquid.

[0091] At the same time, the entire distillation mechanism 22 is controlled through the evaporation module. During use, it is connected to the temperature sensors and liquid level sensors inside the A tank 221 and the B tank 222 for control, and a threshold H1 is set for the liquid level height, and a maximum threshold K1 and a minimum threshold K2 are set for the temperature. At the beginning stage, the water inlet valve at the top of the A tank 221 is in the open state, and the water outlet valve at the bottom is in the closed state. At this time, waste liquid is injected into the A tank 221, and at the same time, the steam discharge pipe 25 passes steam into the steam coil 225 inside the A tank 221 through the steam flow valve, and the waste liquid is heated by the steam. When the liquid level sensor inside the A tank 221 detects that the liquid level height in the A tank 221 reaches the threshold H1, the water inlet valve at the top is automatically closed, and then the temperature is detected to see if it reaches K1. If it does not reach, the steam flow valve on this side is increased to accelerate the heating, and at the same time, waste liquid is injected into the B tank 222. When the temperature inside the A tank 221 reaches K1, the drain valve at the bottom is opened, and then it is sprayed downward into the distillation chamber 223, and the steam valve flow rate is reduced. As the spraying continues, when the liquid level is lower than the threshold H2, the water outlet valve at the bottom of the A tank 221 is closed, and the water inlet valve at the top is opened for the next round of water injection;

[0092] At the same time, when the temperature of the A tank 221 does not reach the threshold K1, the water outlet valve at the bottom of the B tank 222 is closed, and the water inlet valve at the top is opened, and then the same operation process as the A tank 221 is executed. When it is detected that the liquid level of the B tank 222 reaches H1, the water inlet valve at the top of the B tank 222 is closed. Then, if the temperature of the B tank 222 does not reach K1 at this time, water is injected into the A tank 221, and at the same time, the steam flow of the B tank 222 is increased. If the temperature of the B tank 222 reaches K1, the B tank 222 starts to spray downward, so as to realize the alternating water injection of the A tank 221 and the B tank 222, and then spray downward when the temperature reaches K1, while reducing the internal steam flux, so that the A tank 221 and the B tank 222 can spray into the distillation chamber 223 at a specified temperature, so as to distill the target distillate, where the water inlet valve and the water outlet valve are both solenoid valves 224;

[0093] And the product after the first-stage distillation goes down for the second-stage distillation. By utilizing the temperature difference between the evaporation points of acetone and ethanol, fractional distillation and discharge are achieved. During the acetone distillation process, some acetone may not be completely discharged. During the second-stage distillation, by setting the heating temperature K1 slightly higher than the evaporation point of ethanol but not reaching 100 °C, ethanol and some acetone that was not distilled out in the first stage are simultaneously distilled outwards. Then, they are directly mixed and formulated for use in the production of aerogel felts;

[0094] The waste liquid product from which organic solvents have been distilled and discharged enters the neutralization tank 31. At this time, waste liquid acid-base neutralization is carried out through the neutralization module. In this module, the control unit 4 controls the PH sensor, the stirring motor 39, the water stop valve, and the lye addition pump 35. At the same time, a PH threshold S1 is set, and S1 < 7. Multiple neutralization chambers are arranged inside the neutralization tank 31. In the first neutralization chamber, lye is added and the solution is mixed and stirred by controlling the stirring motor 39 and the lye addition pump 35, so that the solution is preliminarily neutralized, and then it is discharged to the next-level neutralization chamber through the communication hole 313. During this process, the multi-point PH sensor measures the PH of the waste liquid flowing through multiple communication holes 313 in the same row. If the pH values of all points are greater than 7 at this time, it means that the alkalinity of the overall mixed waste liquid is too strong. At this time, the water stop valve is closed, and the discharge to the next-level neutralization chamber is stopped. At the same time, the lye addition pump 35 is closed, and acidic waste liquid is allowed to enter, so that the pH value of the waste liquid decreases. When the pH values of all points are not all greater than 7, the water stop valve is opened at this time, and the discharge to the next-level neutralization chamber is carried out. At the same time, it is judged whether the pH values of all points are all less than 7. If they are all less than 7, it means that the overall amount of lye added is too small. At this time, the power of the lye addition pump 35 is increased to accelerate the addition of lye. If the pH values of all points are not all less than 7 at this time, it means that there is a problem of uneven mixing. At this time, it is judged whether the average PH of multiple points is greater than the threshold S1. If so, it means that the solution is qualified, but only the mixing is uneven. At this time, by increasing the power of the stirring motor 39, uniform mixing can be achieved. If the average value is less than S1 at this time, it means that not only is the mixing uneven, but there is also a shortage of lye. At this time, by increasing the power of the lye addition pump 35 and the stirring motor 39, the increase of lye and the increase of the stirring rate are achieved, so as to achieve the mixing of acid-base liquids, so that the acidity and alkalinity of the waste liquid after mixing inside this level of neutralization chamber meet the requirements;

[0095] At the same time, for multiple neutralization chambers, their thresholds S1 are different. From the first-level neutralization chamber to the N-level neutralization chamber, the threshold S1 gradually approaches 7. Thus, after multiple rounds of lye addition and stirring and mixing of the waste liquid, the overall pH value finally approaches 7, so as to meet the discharge requirements. Then, it is discharged through the discharge pump 38 and enters the evaporation chamber 23 for crystallization of salts after neutralization, and the generated steam is supplied to the distillation mechanism 22 for heating to achieve heat recovery and utilization.

[0096] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A wastewater treatment equipment for aerogel felt production, characterized in that: include: A descumming unit (1) which removes fiber scum from the wastewater by filtering; The evaporation unit (2) comprises a distillation mechanism (22) at the top and an evaporation crystallization mechanism at the bottom, wherein the distillation mechanism (22) is composed of two groups and is connected to each other from top to bottom; the distillation mechanism (22) at the top is connected to the slag removal unit (1) and is used for acetone distillation and separation; the distillation mechanism (22) at the bottom is used for ethanol distillation and separation; the evaporation crystallization mechanism is used for evaporating neutralized acidic wastewater to recover crystallized salt; the steam generated during the evaporation process of the evaporation crystallization mechanism is used to provide heat energy to the distillation mechanism (22) at the top; A neutralization unit (3), wherein the feed end is connected to the distillation mechanism (22), and the discharge end is connected to the evaporation crystallization mechanism; the neutralization unit (3) is composed of a plurality of neutralization chambers, and a connecting hole (313) is provided between the plurality of neutralization chambers, and a pH sensor is provided in the connecting hole (313); a roller (33) is provided inside the neutralization chamber, and the roller (33) is used to add alkaline neutralization liquid into the neutralization chamber and perform mixing and stirring at the same time; A control unit (4) is used to control the deslagging unit (1), the evaporation unit (2) and the neutralization unit (3).

2. The wastewater treatment equipment for aerogel felt production according to claim 1, characterized in that: The deslagging unit (1) comprises: Slag pool (11); An active slag removal member (12) is arranged at the feed end of the slag pool (11) and is used to intercept large filter residues and clean them out of the slag pool (11); A lifting pump (13) is fixedly arranged at the discharge end of the slag pool (11), and the output end of the lifting pump (13) is connected to the distillation mechanism (22); The passive filter (14) is fixedly arranged at the feed inlet of the lift pump (13) and is used to block fine debris.

3. The wastewater treatment equipment for aerogel felt production according to claim 2, characterized in that: The active slag removal member (12) comprises: A slag retaining plate (121) is fixedly arranged in the slag pool (11), the slag retaining plate (121) is in an inverted "V" shape as a whole, and an end of the slag retaining plate (121) away from the feeding end of the slag pool (11) is inclined upward; A slag discharge port (122) is integrally formed on both sides of the end of the slag retaining plate (121); A conveyor belt (123) is suspended and fixedly mounted on the top of both sides of the slag retaining plate (121); The scrapers (124) are equidistantly and fixedly distributed on the surface of the conveyor belt (123), and the bottom of the scrapers (124) is in contact with the top of the slag blocking plate (121), so as to push the floating slag toward one end of the slag discharge port (122).

4. The wastewater treatment equipment for aerogel felt production according to claim 2, characterized in that: The distillation mechanism (22) is provided with a heat-insulating layer (21) outside, the evaporation crystallization mechanism comprises an evaporation chamber (23) arranged at the bottom of the heat-insulating layer (21) and an electric heating coil (24) arranged in the evaporation chamber (23), the top of the evaporation chamber (23) is fixedly connected with a steam exhaust pipe (25), the steam exhaust pipe (25) runs through the distillation mechanism (22), the steam exhaust pipe (25) consists of an ascending section and a descending section, the tops of the ascending section and the descending section are connected, and the bottom end of the descending section extends to the outside of the heat-insulating layer (21).

5. The wastewater treatment equipment for aerogel felt production according to claim 4, characterized in that: The distillation mechanism (22) comprises: Two groups of A tanks (221) and B tanks (222) for preheating; A distillation chamber (223) is fixedly arranged at the bottom of the A tank (221) and the B tank (222), and a steam outlet for connecting to a condenser pipe is installed on the top side of the distillation chamber (223), and the bottom end of the lowest group of distillation chambers (223) is connected to the neutralization unit (3); A plurality of solenoid valves (224) are respectively fixedly disposed at the upper and lower ends of the A tank (221) and the B tank (222); A plurality of steam coils (225) are respectively fixedly arranged inside the A tank (221), the B tank (222) and the distillation chamber (223), and a steam flow valve is installed between the air inlet end of the steam coil (225) and the downstream section of the steam exhaust pipe (25); A condensation drain pipe (226), the bottom end of which is connected to the bottom end of the steam drain pipe (25), and the output end of the steam coil (225) is connected to the condensation drain pipe (226); A spray plate (227) is fixedly arranged at the top of the distillation chamber (223), and the bottom ends of the A tank (221) and the B tank (222) are connected to the spray plate (227) via a solenoid valve (224).

6. The wastewater treatment equipment for aerogel felt production according to claim 5, characterized in that: The neutralization unit (3) further comprises: Neutralization pool (31); A partition plate (310) is fixedly arranged in the neutralization chamber at equal intervals and is used to divide the neutralization tank (31) into a plurality of neutralization chambers, and the communication hole (313) is opened on the partition plate (310); A feed spray rack (32) is fixedly mounted at the front end of the neutralization tank (31) and connected to the distillation chamber (223) at the bottom end; An alkali liquid box (34) is fixedly arranged on the outer wall of the neutralization tank (31) and is connected to the rotating roller (33); A stirring motor (39), which is fixedly mounted on the outer wall of the neutralization tank (31) and is drivingly connected to the rotating roller (33); A discharge pump (38), the input end of which is connected to the end of the neutralization tank (31), and the output end of which is connected to the evaporation chamber (23); A water stop valve is provided on the partition plate (310) and is used to cover or expose the communication hole (313).

7. The wastewater treatment equipment for aerogel felt production according to claim 6, characterized in that: The outer wall of the rotating roller (33) is provided with nozzles (311) and paddles (312) at intervals, the outer wall of the neutralization tank (31) is fixedly provided with an alkali solution adding pump (35), the end of the rotating roller (33) and the output end of the alkali solution adding pump (35) are assembled by a rotary seal; the input end of the alkali solution adding pump (35) is connected to the alkali solution tank (34).

8. The wastewater treatment equipment for aerogel felt production according to claim 6, characterized in that: The water stop valve comprises a water stop baffle (37) slidably arranged on the outer wall of the partition plate (310) and an electric telescopic cylinder (36) fixedly arranged on the partition plate (310), wherein the output end of the electric telescopic cylinder (36) is fixedly connected to the partition plate (310).

9. The wastewater treatment equipment for aerogel felt production according to claim 9, characterized in that: The number of the communicating holes (313) on the partition plate (310) is multiple and they are linearly horizontally distributed; the communicating holes (313) on the multiple groups of the partition plates (310) are arranged in an up-and-down staggered manner, and an "S"-shaped water flow line is formed between the multiple neutralization chambers through the communicating holes (313) on the multiple groups of the partition plates (310).

10. A control system for controlling the wastewater treatment equipment for aerogel felt production according to any one of claims 1 to 9, characterized in that: Includes the following modules: A control core, which is a control unit (4); A slag removal module controls the conveyor belt (123) to move to remove slag through a control unit (4), and then pumps slag removal wastewater into an evaporation unit (2) through a lift pump (13); The evaporation module comprises a solenoid valve (224) and a steam flow valve, and also comprises a temperature sensor and a liquid level sensor arranged inside the A tank (221) and the B tank (222), wherein the liquid level is monitored by the liquid level sensor, and the temperature value is monitored by the temperature sensor, and when the liquid level and the temperature value reach a threshold value, liquid is sprayed into the distillation chamber, so that the target distillation product is atomized and distilled out of the distillation chamber within a specified temperature range; The neutralization module comprises a pH sensor, a stirring motor (39), a water stop valve and an alkali solution adding pump (35). The pH sensor is used to monitor the pH value of the liquid flowing between the two neutralization chambers. When the pH value is detected to be alkaline, the water stop valve and the alkali solution adding pump (35) are closed, and neutralization is performed after the acid solution continues to flow in. When the pH value is detected to be acidic, the alkali solution adding pump (35) and the stirring motor (39) are adjusted according to the average acidity value and the multi-point pH difference, thereby overcoming the problems of acidity strength and large acidity difference caused by insufficient alkali solution and uneven mixing.

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