A zinc-nickel alloy waste liquid roller evaporator

Abstract

The utility model discloses a zinc nickel alloy waste liquid drum evaporator, including circulating jar, feed slot, bag filter, drum drying device and scrape material output structure, the utility model discloses through trapezoidal recessed groove drum structure design and will effectively promote heat transfer area 50%-60%, innovatively adopt the composite antifouling system of ultrasonic wave cooperation mechanical scraping, cooperate with the inclined plate type circulating system with self -cleaning function, successfully realized the efficient evaporation and stable operation of zinc nickel alloy waste liquid, the device through the process-structure collaborative innovation, realizes the hazardous waste reduction and harmlessness simultaneously, and the land area is reduced, and the operation and maintenance cost are reduced, and the high reliability equipment support is provided for electroplating industry zero emission.

Description

Technical Field

[0001] This utility model relates to a drum evaporator, and more specifically, a zinc-nickel alloy waste liquid drum evaporator. Background Technology

[0002] Zinc-nickel alloy wastewater is a typical high-concentration industrial wastewater generated in electroplating processes. Its composition is complex and its treatment is extremely difficult. This wastewater mainly contains heavy metals such as zinc and nickel ions, as well as high concentrations of complexing agents, strong alkaline substances, and organic additives such as brighteners and stabilizers. Compared to conventional electroplating wastewater, its pollutant concentration is 2-3 orders of magnitude higher, and due to the mixing with pretreatment bath solutions, the COD value can reach 5000-8000 mg / L, and the fluoride ion concentration exceeds 100 mg / L, forming a special wastewater system with strong corrosiveness and a tendency to crystallize and form scale. Although drum evaporation technology has been applied in the treatment of chemical wastewater, it has significant defects when treating zinc-nickel alloy waste liquid: (1) Due to structural limitations, the effective heat transfer area of ​​the traditional cylindrical drum is only 60%-70% of the surface area, resulting in low evaporation efficiency per unit volume; (2) The synergistic effect of high concentration of salt and organic matter in the waste liquid makes it easy to form a composite scale layer of silicate / metal hydroxide on the drum surface under the working conditions of 80-95℃, which seriously reduces the heat transfer coefficient; (3) The existing scraper system is difficult to adapt to complex scale morphology, and the adjustment accuracy is less than ±3mm, resulting in incomplete scraping and secondary scale formation; (4) The supporting circulation system lacks optimized design for high viscosity materials, and the volume redundancy of the feed tank exceeds 30%, resulting in increased equipment footprint and energy consumption.

[0003] To address the aforementioned technical challenges, this invention develops a zinc-nickel alloy waste liquid drum evaporator. By employing a trapezoidal grooved drum structure design, the effective heat transfer area is increased by 50%-60%. An innovative composite anti-scaling system combining ultrasonic and mechanical scraping, coupled with a self-cleaning inclined plate circulation system, successfully achieves efficient evaporation and stable operation of zinc-nickel alloy waste liquid. Through synergistic innovation in process and structure, this device reduces hazardous waste volume and harmlessness while minimizing floor space and lowering maintenance costs, providing highly reliable equipment support for zero-emission applications in the electroplating industry. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this utility model provides a zinc-nickel alloy waste liquid drum evaporator, which adopts the following technical solution:

[0005] A zinc-nickel alloy waste liquid rotary evaporator is characterized by comprising a circulation tank, a feed trough, a bag filter, a rotary drum dryer, and a scraper output structure; the circulation tank is equipped with a stirrer at the top and connected to the feed trough inlet at the bottom via a circulation pump, and the feed trough outlet is connected back to the circulation tank via a pipeline; the rotary drum dryer includes an annular drum with uniformly distributed trapezoidal grooves on its surface and an annular cavity inside that fits the outer wall of the drum; the scraper output structure includes a serrated scraper, a scraper sleeve, an adjusting rod, and a screw conveyor.

[0006] Furthermore, the two sides of the annular roller are connected to an L-shaped oil inlet pipe and an L-shaped oil outlet pipe via a support shaft seat; the L-shaped oil inlet pipe and the L-shaped oil outlet pipe are also equipped with rotary sealing joints.

[0007] Furthermore, a support base is provided below the annular roller, and the first and second rotating shafts are driven by a reducer to rotate the annular roller.

[0008] Furthermore, an outer cover with an exhaust port is provided above the annular roller.

[0009] Furthermore, ultrasonic transducers are provided on both sides of the feed trough, and a 150° inclined plate is provided inside the feed trough. An air vent is provided at the end of the inclined plate, and a liquid level switch is provided on the feed inlet side.

[0010] Furthermore, the discharge port is connected to the inlet of the bag filter via a pipe. The bag filter contains a filter bag, has a screw at the top, and an outlet at the bottom. The outlet is connected to the second return port of the circulation tank via a pipe. The inlet of the bag filter is connected to the first return port of the circulation tank via a pipe.

[0011] Compared with existing technologies, the advantages of this utility model are:

[0012] (1) The drum evaporator used in this invention adopts a trapezoidal groove drum, which greatly increases the drying area of ​​the drum and improves the processing efficiency of the evaporation device;

[0013] (2) The trapezoidal grooved drum of the drum evaporator used in this invention has an internal annular cavity and several reinforcing columns, which reduces the amount of heat transfer oil used and ensures the strength of the drum, thereby achieving energy saving and consumption reduction of the drum drying device.

[0014] (3) The ultrasonic intelligent descaling system and filtration system of the drum evaporator used in this invention can effectively solve the problem of scale formation in the evaporator and reduce the equipment failure rate.

[0015] (4) The drum evaporator used in this invention can significantly reduce the treatment cost of zinc-nickel alloy electroplating waste liquid and alleviate the pressure of sewage treatment to meet standards. Attached Figure Description

[0016] Figure 1 This is the front view of the present invention;

[0017] Figure 2 This is a side view of the present invention;

[0018] Figure 3 This is a cross-sectional view of the roller of this utility model;

[0019] Figure 4 This is a schematic diagram of the scraper of this utility model.

[0020] The components are as follows: 1-Circulation tank, 2-Agitator, 3-Circulation pump, 4-Inlet, 5-Outlet, 6-Outer cover, 7-Annular roller, 8-Serrated scraper, 9-Scraper sleeve, 10-Adjusting rod, 11-Support shaft seat, 12-Second rotating shaft, 13-Rotary sealing joint, 14-L-shaped oil inlet pipe, 15-L-shaped oil outlet pipe, 16-First rotating shaft, 17-Reducer, 18-Exhaust port, 19-Inlet trough, 20-Drainage port, 21-Inclined plate, 22-Screw conveyor, 23-Annular cavity, 24-Level switch, 25-Ultrasonic vibrator, 26-Support base, 27-Screw, 28-Bag filter, 29-Filter bag, 30-Water inlet, 31-Water outlet, 32-Second return water inlet, 33-First return water inlet, 34-Trapezoidal groove. Detailed Implementation

[0021] The present invention will be further described and illustrated below with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this utility model provides a zinc-nickel alloy waste liquid drum evaporator, characterized in that it includes a circulation tank 1, a feed trough 19, a bag filter 28, a drum drying device, and a scraping output structure; the top of the circulation tank 1 is equipped with a stirrer 2, and the bottom is connected to the feed inlet 4 of the feed trough 19 through a circulation pump 3, and the discharge outlet 5 of the feed trough 19 is connected back to the circulation tank 1 through a pipeline; the drum drying device includes an annular drum 7, the surface of which is provided with uniformly distributed trapezoidal grooves 34, and the interior is provided with an annular cavity 23 adapted to the outer wall of the drum; the scraping output structure includes a serrated scraper 8, a scraper sleeve 9, an adjusting rod 10, and a screw conveyor 22.

[0023] The two sides of the annular roller 7 are connected by an L-shaped oil inlet pipe 14 and an L-shaped oil outlet pipe 15 through a support shaft seat 11; the L-shaped oil inlet pipe 14 and the L-shaped oil outlet pipe 15 are also provided with rotary sealing joints 13.

[0024] The annular roller 7 is provided with a support base 26 below it. The first rotating shaft 16 and the second rotating shaft 12 are driven by the reducer 17 to rotate the annular roller 7.

[0025] The annular roller 7 is provided with an outer cover 6 with an exhaust port 18.

[0026] The feed trough 19 is provided with ultrasonic transducers 25 on both sides, and the feed trough 19 is provided with a 150° inclined plate 21 inside. The end of the inclined plate 21 is provided with an air outlet 20, and a liquid level switch 24 is provided on the side of the feed inlet 4.

[0027] The discharge port 5 is connected to the inlet 30 of the bag filter 28 through a pipe. The bag filter 28 is equipped with a filter bag 29, a screw 27 at the top, and an outlet 31 at the bottom. The outlet 31 is connected to the second return water port 32 of the circulation tank 1 through a pipe. The inlet 30 of the bag filter 28 is connected to the first return water port 33 of the circulation tank 1 through a pipe.

[0028] The system's processing flow is as follows: The zinc-nickel alloy waste liquid in the circulating tank 1 is transported to the feeding tank 19 by the circulating pump 3. The optimal liquid level is maintained by the level switch 24 to ensure that the outer wall of the annular drum 7 is fully immersed in the waste liquid to form a uniform liquid film. The 150° inclined plate 21 at the bottom of the feeding tank and the drain port 20 work together to optimize the contact effect and volume control. The surface of the annular drum 7 is provided with trapezoidal grooves 34 to increase the drying area by 50%-60%. The internal annular cavity 23 forms a dual-channel heat transfer oil circuit through the L-shaped oil inlet pipe 14 and the L-shaped oil outlet pipe 15. The closed-loop heat circulation is achieved through the rotary sealing joint 13. The reducer 17 drives the first rotating shaft 16 and the second rotating shaft 12 to drive the annular drum 7 to rotate at a uniform speed to accelerate evaporation. The serrated scraper 8 passes through... The adjusting rod 10 dynamically controls the gap to precisely separate solid materials to the screw conveyor 22. Ultrasonic transducers 25 on both sides of the feed trough 19 vibrate at a high frequency of 28kHz, working in conjunction with the filter bags 29 of the bag filter 28 to prevent scaling and recover filtrate. Evaporation exhaust gas is discharged through the exhaust port 18 at the top of the outer cover 6. When the ultrasonic transducers 25 and the bag filter 28 are working, the liquid in the feed trough 19 enters the bag filter 28 from the outlet 5. After filtration, the liquid enters the circulation tank 1 through the first return water port 32, achieving liquid circulation. When the ultrasonic transducers 25 and the bag filter 28 are not working, the liquid in the feed trough 19 can directly bypass the bag filter and enter the circulation tank 1 through the second return water port, achieving liquid circulation. The support base 26 and support shaft seat 11 ensure structural stability. The integrated trapezoidal groove enhances heat transfer, dynamic scraping, and intelligent cleaning modules, significantly improving evaporation efficiency and resource recovery rate.

[0029] This invention increases the effective heat transfer area by 50%-60% through a trapezoidal grooved roller structure design. It innovatively employs a composite anti-scaling system combining ultrasonic and mechanical scraping, along with a self-cleaning inclined plate circulation system, successfully achieving efficient evaporation and stable operation of zinc-nickel alloy waste liquid. Through synergistic innovation in process and structure, this device reduces hazardous waste volume and harmlessness while minimizing floor space and lowering operation and maintenance costs, providing highly reliable equipment support for zero emissions in the electroplating industry. Example

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0031] A zinc-nickel alloy waste liquid drum evaporator was trial-produced using the above technical solution, such as... Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the object of treatment is zinc-nickel alloy waste liquid.

[0032] The device includes a circulation tank 1, a mixer 2, a circulation pump 3, a feed inlet 4, a discharge outlet 5, an outer cover 6, an annular drum 7, a serrated scraper 8, a scraper sleeve 9, an adjusting rod 10, a support shaft seat 11, a second rotating shaft 12, a rotary sealing joint 13, an L-shaped oil inlet pipe 14, an L-shaped oil outlet pipe 15, a first rotating shaft 16, a reducer 17, an exhaust port 18, a feed trough 19, an air vent 20, an inclined plate 21, a screw conveyor 22, an annular cavity 23, a liquid level switch 24, an ultrasonic transducer 25, a support base 26, a screw 27, a bag filter 28, a filter bag 29, a water inlet 30, a water outlet 31, a second return water inlet 32, a first return water inlet 33, and a trapezoidal groove 34.

[0033] The device includes a circulation tank 1, a feed trough 19, a bag filter 28, a drum dryer, and a scraper output structure. The top of the circulation tank 1 is equipped with a mixer 2, and the bottom is connected to the feed inlet 4 of the feed trough 19 through a circulation pump 3. The discharge outlet 5 of the feed trough 19 is connected back to the circulation tank 1 through a pipeline. The drum dryer includes an annular drum 7, the surface of which is provided with evenly distributed trapezoidal grooves 34, and the interior is provided with an annular cavity 23 adapted to the outer wall of the drum. The scraper output structure includes a serrated scraper 8, a scraper sleeve 9, an adjusting rod 10, and a screw conveyor 22.

[0034] The two sides of the annular roller 7 are connected by an L-shaped oil inlet pipe 14 and an L-shaped oil outlet pipe 15 through a support shaft seat 11; the L-shaped oil inlet pipe 14 and the L-shaped oil outlet pipe 15 are also provided with rotary sealing joints 13.

[0035] The annular roller 7 is provided with a support base 26 below it. The first rotating shaft 16 and the second rotating shaft 12 are driven by the reducer 17 to rotate the annular roller 7.

[0036] The annular roller 7 is provided with an outer cover 6 with an exhaust port 18.

[0037] The feed trough 19 is provided with ultrasonic transducers 25 on both sides, and the feed trough 19 is provided with a 150° inclined plate 21 inside. The end of the inclined plate 21 is provided with an air outlet 20, and a liquid level switch 24 is provided on the side of the feed inlet 4.

[0038] The discharge port 5 is connected to the inlet 30 of the bag filter 28 through a pipe. The bag filter 28 is provided with a filter bag 29, a screw 27 at the top, and an outlet 31 at the bottom. The outlet 31 is connected to the second return water port 32 of the circulation tank 1 through a pipe. The inlet 30 of the bag filter 28 is connected to the first return water port 33 of the circulation tank 1 through a pipe.

[0039] At a wastewater treatment plant for electroplating in Wenzhou, approximately 2 cubic meters of wastewater are discharged daily. 3 The zinc-nickel alloy waste liquid is difficult to treat using conventional processes. Sampling and analysis revealed the raw water quality as shown in Table 1. The operating parameters of the device of this invention are shown in Table 2. It is evident that this invention can effectively treat zinc-nickel alloy waste liquid. Furthermore, continuous monitoring of scaling in the feed tank during operation revealed that the bottom of the feed tank of the novel rotary drum evaporator provided by this invention has virtually no significant scaling, demonstrating that the intelligent descaling system effectively solves the scaling problem in the feed tank.

[0040] Table 1. Water quality of zinc-nickel alloy waste liquid before treatment

[0041]

[0042] Table 2. 24-hour treatment results of the drum evaporator of this utility model.

[0043]

[0044] The above-described embodiments are merely illustrative of one implementation of this utility model and are not intended to limit it. It should be noted that those skilled in the art can modify the technical solutions described in the above embodiments or make equivalent substitutions for some or all of the technical features; however, these modifications or substitutions do not cause the essence of the corresponding technical solutions to depart from the protection scope of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

Claims

1. A zinc-nickel alloy waste liquid drum evaporator, characterized in that, The device includes a circulating tank (1), a feed trough (19), a bag filter (28), a drum dryer, and a scraper output structure. The circulating tank (1) is equipped with a mixer (2) at the top and is connected to the feed inlet (4) of the feed trough (19) at the bottom via a circulating pump (3). The discharge outlet (5) of the feed trough (19) is connected back to the circulating tank (1) via a pipeline. The drum dryer includes an annular drum (7) with evenly distributed trapezoidal grooves (34) on its surface and an annular cavity (23) inside that is adapted to the outer wall of the drum. The scraper output structure includes a serrated scraper (8), a scraper sleeve (9), an adjusting rod (10), and a screw conveyor (22).

2. The zinc-nickel alloy waste liquid drum evaporator according to claim 1, characterized in that, The annular roller (7) is connected to an L-shaped oil inlet pipe (14) and an L-shaped oil outlet pipe (15) on both sides by a support shaft seat (11); the L-shaped oil inlet pipe (14) and the L-shaped oil outlet pipe (15) are also provided with rotary sealing joints (13).

3. The zinc-nickel alloy waste liquid drum evaporator according to claim 1, characterized in that, The annular roller (7) is provided with a support base (26) below it. The first rotating shaft (16) and the second rotating shaft (12) are driven by the reducer (17) to rotate the annular roller (7).

4. The zinc-nickel alloy waste liquid drum evaporator according to claim 1, characterized in that, The annular roller (7) is provided with an outer cover (6) with an exhaust port (18) above it.

5. A zinc-nickel alloy waste liquid drum evaporator according to claim 1, characterized in that, The feed trough (19) is provided with ultrasonic transducers (25) on both sides. The feed trough (19) is provided with a 150° inclined plate (21) inside. The end of the inclined plate (21) is provided with an air vent (20). A liquid level switch (24) is provided on the side of the feed inlet (4).

6. A zinc-nickel alloy waste liquid drum evaporator according to claim 1, characterized in that, The discharge port (5) is connected to the inlet (30) of the bag filter (28) through a pipe. The bag filter (28) is equipped with a filter bag (29), a screw (27) at the top, and an outlet (31) at the bottom. The outlet (31) is connected to the second return water port (32) of the circulation tank (1) through a pipe. The inlet (30) of the bag filter (28) is connected to the first return water port (33) of the circulation tank (1) through a pipe.

Images