A nitric acid recovery system for waste acid recovery

Abstract

The utility model discloses a kind of nitric acid recovery systems of waste acid recovery, including box, the inlet in the upper side of the front end of box is provided with feed pipe, the front side of feed pipe is connected with feed valve, the lower side of the right end of box is provided with discharge pipe in the discharge port, the right side of discharge pipe is connected with discharge valve, the cavity in the left and right sides inside box is respectively provided with electric heating wire, further including stirring mechanism;Stirring mechanism: it includes output rod, stirring vane and disturbance component, the middle part of output rod is rotatably connected to the top wall of box, the lower side of output rod outer arc surface is respectively provided with stirring vane, disturbance component is set to the upper end of box, output rod is driven by disturbance component, the nitric acid recovery system of this waste acid recovery, make waste acid solution more evenly distributed in the box also make heat more dispersed, further accelerate water evaporation, shorten the time spent in recovering nitric acid.

Description

Technical Field

[0001] This utility model relates to the technical field of waste acid recovery equipment, specifically a nitric acid recovery system for waste acid recovery. Background Technology

[0002] A nitric acid recovery system for waste acid is a device used to recover nitric acid from industrial waste acid. This system can reduce waste acid emissions, reduce environmental pollution, and simultaneously recover valuable nitric acid resources. Recovering nitric acid can also reduce the purchase of new acid, lowering production costs. The existing technology is authorized by publication number CN 212687824. U's patent discloses a wastewater evaporation and concentration device, including a rectangular base and a circular box. The circular box contains an evaporation and concentration structure, and the circular box is equipped with a steam treatment structure. The evaporation and concentration structure includes multiple heating rods, a servo motor, and a screen plate. During use, although the device can stir the solution using a stirring rod at the bottom of the box, the stirring range is limited and cannot cover the entire box, resulting in certain stirring dead zones. These dead zones lead to uneven mixing of the waste acid solution within the box, which in turn leads to uneven temperature distribution. Uneven temperature distribution results in inconsistent evaporation rates in different areas. To ensure that the waste acid solution in all areas achieves the required evaporation effect, the evaporation time needs to be extended, which reduces work efficiency. Therefore, we propose a nitric acid recovery system for waste acid recovery. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the existing defects and provide a nitric acid recovery system for waste acid recovery. Through the cooperation of rack and pinion plates and one-third gear, two sets of disturbance plates can be driven to perform lateral reciprocating motion. This can disturb the waste acid solution from two directions at the same time, making the distribution of the waste acid solution in the tank more uniform and the heat more dispersed, further accelerating the evaporation of water and shortening the time spent recovering nitric acid. This can effectively solve the problems in the background technology.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a nitric acid recovery system for waste acid recovery, comprising a tank, an inlet port at the upper front of the tank containing an inlet pipe, an inlet valve connected in series at the front of the inlet pipe, a discharge port at the lower right end of the tank containing a discharge pipe, a discharge valve connected in series on the right side of the discharge pipe, electric heating wires respectively installed in cavities on the left and right sides inside the tank, and a stirring mechanism;

[0005] The stirring mechanism includes an output rod, stirring blades, and a disturbance component. The output rod is rotatably connected to the middle of the top wall of the tank. Stirring blades are respectively installed on the lower side of the outer arc surface of the output rod. The disturbance component is located at the upper end of the tank. The output rod is driven by the disturbance component. Through the cooperation of the rack and pinion and the third gear, it can drive two sets of disturbance plates to perform lateral reciprocating motion. It can disturb the waste acid solution from two directions at the same time, making the distribution of the waste acid solution in the tank more uniform and the heat more dispersed, further accelerating the evaporation of water and shortening the time spent recovering nitric acid.

[0006] Furthermore, a microcontroller is installed at the front end of the housing. The input terminal of the microcontroller is electrically connected to an external power source, and the input terminals of the heating wires are electrically connected to the output terminals of the microcontroller, enabling the control of the electrical components inside the equipment.

[0007] Furthermore, the disturbance component includes a connecting plate, a disturbance plate, a protective cover, a horizontal plate, a fixing plate, a rack plate, a one-third gear, and a sealing rubber ring. The sealing rubber rings are respectively disposed on the upper sides of the left and right walls of the housing. The connecting plate is slidably connected inside both sealing rubber rings. A disturbance plate is disposed on the lower side of the opposite inner end of the two connecting plates. The two disturbance plates are respectively located on the left and right sides inside the housing. The protective cover is disposed in the middle of the upper end of the housing. A horizontal plate is slidably connected in the groove opened in the middle of the left and right walls of the protective cover. The ends of the two horizontal plates away from the center of the housing are respectively fixedly connected to the upper side of the opposite inner end of the horizontally adjacent connecting plate. A fixing plate is disposed on the opposite inner end of the two horizontal plates. A rack plate is disposed on the front and rear sides between the opposite inner sides of the two fixing plates. The one-third gear is disposed on the upper side of the outer arc surface of the output rod. The two rack plates are installed in conjunction with the one-third gear, which can disturb the waste acid solution from two directions at the same time, making the distribution of the waste acid solution in the housing more uniform and also making the heat more dispersed.

[0008] Furthermore, the disturbance component also includes a servo motor, which is located in the middle of the upper part of the protective cover. The lower end of the servo motor output shaft is fixedly connected to the upper end of the output rod, and the input end of the servo motor is electrically connected to the output end of the microcontroller, which can drive the output rod to rotate.

[0009] Furthermore, temperature detectors are respectively installed on the upper and lower sides of the front end of the box. The probes of the two temperature detectors are located inside the box, with the upper temperature detector located on the lower side of the feed pipe. The temperature detectors are bidirectionally electrically connected to the microcontroller and can detect the temperature of the waste acid solution.

[0010] Furthermore, a refractometer is installed on the front side of the upper end of the box, and a probe is installed at the lower end of the refractometer inside the box. The refractometer is bidirectionally electrically connected to the microcontroller and can detect the concentration of nitric acid.

[0011] Furthermore, each of the four vent holes at the corners of the top wall of the box is equipped with an exhaust pipe, and an exhaust valve is connected in series on the upper side of each of the four exhaust pipes, which can discharge water vapor from the box.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This nitric acid recovery system for waste acid recovery has the following advantages:

[0013] The rack and pinion mechanism, along with the one-third gear, drives two sets of agitators to reciprocate laterally. This agitates the waste acid solution from two directions simultaneously, resulting in a more uniform distribution of the waste acid solution within the tank and a more dispersed heat distribution. This further accelerates water evaporation and shortens the time required to recover nitric acid. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the front sectional structure of the present invention;

[0016] Figure 3 This is a schematic diagram of the stirring mechanism of this utility model.

[0017] In the diagram: 1. Housing, 2. Microcontroller, 3. Feed pipe, 4. Discharge pipe, 5. Exhaust pipe, 6. Stirring mechanism, 61. Output rod, 62. Stirring blade, 63. Disturbance component, 631. Connecting plate, 632. Disturbance plate, 633. Protective cover, 634. Horizontal plate, 635. Fixing plate, 636. Rack plate, 637. One-third gear, 638. Servo motor, 639. Sealing rubber ring, 7. Temperature detector, 8. Refractometer, 9. Electric heating wire. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-3This embodiment provides a technical solution: a nitric acid recovery system for waste acid recovery, including a housing 1, a feed pipe 3 is provided in the feed inlet on the upper side of the front end of the housing 1, a feed valve is connected in series on the front side of the feed pipe 3, a discharge pipe 4 is provided in the discharge inlet on the lower side of the right end of the housing 1, a discharge valve is connected in series on the right side of the discharge pipe 4, electric heating wires 9 are respectively provided in the cavities on the left and right sides inside the housing 1, the electric heating wires 9 heat the waste acid solution through the housing 1, the electric heating wires 9 are nickel-chromium alloy heating wires, which have high resistivity and can heat up rapidly after being energized, and also includes a stirring mechanism 6;

[0020] The stirring mechanism 6 includes an output rod 61, stirring blades 62, and a disturbance component 63. The output rod 61 is rotatably connected to the middle of the top wall of the housing 1. The stirring blades 62 are respectively arranged on the lower side of the outer arc surface of the output rod 61. The disturbance component 63 is arranged at the upper end of the housing 1. The output rod 61 is driven by the disturbance component 63. The disturbance component 63 includes a connecting plate 631, a disturbance plate 632, a protective cover 633, a horizontal plate 634, a fixing plate 635, a rack plate 636, a one-third gear 637, and a sealing rubber ring 639. The sealing rubber rings 639 are respectively arranged on the upper side of the left and right walls of the housing 1. The connecting plate 631 is slidably connected inside the two sealing rubber rings 639. The disturbance plate is arranged on the lower side of the opposite inner end of the two connecting plates 631. 632, two disturbance plates 632 are located on the left and right sides inside the housing 1 respectively. A protective cover 633 is set in the middle of the upper end of the housing 1. Horizontal plates 634 are slidably connected in the sliding grooves opened in the middle of the left and right walls of the protective cover 633. The ends of the two horizontal plates 634 away from the center of the housing 1 are fixedly connected to the upper side of the opposite inner end of the horizontally adjacent connecting plate 631. Fixed plates 635 are set on the opposite inner ends of the two horizontal plates 634. Rack plates 636 are set on the front and rear sides between the opposite inner sides of the two fixed plates 635. One-third gear 637 is set on the upper side of the outer arc surface of the output rod 61. Both rack plates 636 are installed in conjunction with one-third gear 637. The disturbance component 63 also includes a servo motor 638. The servo motor 638 is located in the middle of the upper part of the protective cover 633. The lower end of the output shaft of the servo motor 638 is fixedly connected to the upper end of the output rod 61. The input end of the servo motor 638 is electrically connected to the output end of the microcontroller 2. The output shaft of the servo motor 638 drives the stirring blade 62 to rotate through the output rod 61, thereby stirring the waste acid solution. At the same time, the output rod 61 drives the one-third gear 637 to rotate during rotation. When the one-third gear 637 meshes with the rack plate 636 on the rear side, the one-third gear 637 drives the fixed plate 635 to move to the left through the rack plate 636. The fixed plate 635 then drives the connecting plate 631 to the left through the horizontal plate 634. When the connecting plate 631 moves, it drives the disturbance plate 632 to move to the left. When the third gear 637 meshes with the front rack plate 636, the third gear 637 drives the fixed plate 635 to move to the right and reset through the front rack plate 636. The fixed plate 635 drives the connecting plate 631 to move to the right and reset through the horizontal plate 634. The connecting plate 631 drives the disturbance plate 632 to move to the right and reset. This causes the two disturbance plates 632 to perform a lateral reciprocating motion. During the movement, the disturbance plates 632 will disturb the waste acid solution from two directions at the same time, making the distribution of the waste acid solution in the tank 1 more uniform and also dispersing the heat more, further accelerating the evaporation of water and shortening the time spent recovering nitric acid.

[0021] Among them, the front end of the housing 1 is equipped with a microcontroller 2. The input end of the microcontroller 2 is electrically connected to an external power supply, and the input end of the electric heating wire 9 is electrically connected to the output end of the microcontroller 2, which can regulate the electrical components inside the equipment.

[0022] Temperature detectors 7 are installed on the upper and lower sides of the front end of the housing 1. The probes of the two temperature detectors 7 are located inside the housing 1, with the upper temperature detector 7 located below the feed pipe 3. Both temperature detectors 7 are bidirectionally electrically connected to the microcontroller 2. During the heating process of the waste acid solution by the heating wire 9, the two temperature detectors 7 collect the temperature signal of the waste acid solution through the resistance temperature sensor. The resistance temperature sensor converts the temperature change into a change in resistance value. Then, the temperature detectors 7 convert the resistance value into a temperature value through the built-in algorithm. The data calculated by the temperature detectors 7 is then transmitted to the microcontroller 2. The microcontroller 2 receives the data sent by the temperature detectors 7 through the built-in serial communication port. Then, the microcontroller 2 takes an intermediate value based on the data provided by the two sets of temperature detectors 7. This intermediate value is the temperature of the waste acid solution.

[0023] The unit consists of a refractometer 8 mounted on the front of the upper part of housing 1. A probe located at the lower end of the refractometer 8 is situated inside housing 1. The refractometer 8 is bidirectionally electrically connected to the microcontroller 2. During operation, the light source inside the probe of the refractometer 8 emits a beam of light. This beam passes through a collimating lens, becoming parallel light. The parallel light then enters a high-refractive-index prism, typically a semi-circular or rectangular prism. The prism guides the light onto the waste acid solution. The refractometer 8 then uses an internal photodetector to detect the intensity of the reflected light. By measuring the change in the intensity of the reflected light, the refractometer 8 can determine the critical angle at the prism-liquid interface. The critical angle is related to the refractive index of the liquid, which can be calculated. There is a correlation between the refractive index and the concentration of the liquid. For nitric acid solution, the refractive index increases with increasing concentration. The refractometer 8 uses a built-in calibration curve or formula to convert the measured refractive index into the concentration of nitric acid.

[0024] Among them: exhaust pipes 5 are installed in the exhaust holes at the four corners of the top wall of the box 1. Exhaust valves are connected in series on the upper side of the four exhaust pipes 5. When the exhaust valves are opened, the water vapor generated by evaporation will be discharged into the external condenser through the exhaust pipes 5. The condenser can recover the water in the water vapor and then use it as process water or discharge it.

[0025] The working principle of the nitric acid recovery system for waste acid recovery provided by this utility model is as follows: Before use, the feed pipe 3 and discharge pipe 4 are connected to the external pipeline (the connection method between the feed pipe 3 and discharge pipe 4 and the external pipeline adopts the common technology for connecting pipelines in the prior art), and then the exhaust pipe 5 is connected to the external condenser (the flange one at the upper end of the exhaust pipe 5 is connected to the flange two of the condenser by screws). During the use of the nitric acid recovery system for waste acid recovery, the operator first opens the feed valve, and then the waste acid solution after sedimentation filtration and oxidation treatment (oxidation treatment can remove organic matter in the waste acid and reduce interference with subsequent processing) is injected into the feed pipe 3 through the external pipeline. The waste acid solution then flows into the interior of the chamber 1 through the feed pipe 3. After the waste acid solution is added, the feed valve is closed. Then, under the control of the microcontroller 2, the electric heating wire 9 starts to operate. The electric heating wire 9 heats the waste acid solution through the chamber 1. The electric heating wire 9 is a nickel-chromium alloy heating wire with high resistivity, which can heat up rapidly after being energized. During the heating process of the waste acid solution by the electric heating wire 9, two temperature detectors 7 collect the temperature signal of the waste acid solution through thermistor sensors. The thermistor sensors convert the temperature change into the resistance value change. Then, the temperature detectors 7 convert the resistance value into a temperature value through the built-in algorithm. After that, the data calculated by the temperature detectors 7 is transmitted to the microcontroller 2. The microcontroller 2 receives the data from the temperature detectors 7 through the built-in serial communication port. The microcontroller 2 receives the data from the two temperature detectors 7 and then takes an intermediate value, which is the temperature of the waste acid solution. This temperature is maintained at approximately 100°C to 110°C. This temperature range effectively removes moisture while avoiding excessive heat of vaporization of nitric acid. Heating evaporates the moisture in the waste acid solution, increasing its concentration. Simultaneously, the exhaust valve is opened, and the water vapor produced by evaporation is discharged into the external condenser through the exhaust pipe 5. The condenser can recover the moisture from the water vapor for later use as process water or for discharge. During the operation of the electric heating wire 9, the servo motor 638 starts running under the control of the microcontroller 2. The output shaft drives the stirring blades 62 to rotate via the output rod 61, thereby stirring the waste acid solution. Simultaneously, the output rod 61 rotates the one-third gear 637. When the one-third gear 637 meshes with the rear rack plate 636, it drives the fixed plate 635 to move to the left via the rack plate 636. The fixed plate 635 then drives the connecting plate 631 to move to the left via the horizontal plate 634. The connecting plate 631 then drives the disturbance plate 632 to move to the left. When the one-third gear 637 meshes with the front rack plate 636, it drives the fixed plate 635 to move to the right and reset via the rack plate 636.The fixed plate 635 drives the connecting plate 631 to move to the right and reset via the horizontal plate 634. The connecting plate 631 then drives the disturbance plate 632 to move to the right and reset, thereby causing the two disturbance plates 632 to perform a lateral reciprocating motion. During the movement, the disturbance plates 632 simultaneously disturb the waste acid solution from two directions. During use, the light source inside the refractometer 8 probe emits a beam of light. This beam of light passes through a collimating lens and becomes a parallel beam. The parallel beam of light then enters a high-refractive-index prism, typically a semi-circular or rectangular prism. The prism guides the light onto the waste acid solution. The refractometer 8 then uses an internal photodetector to detect the intensity of the reflected light. By measuring the intensity change of reflected light, refractometer 8 can determine the critical angle of light at the interface between the prism and the liquid. There is a certain relationship between the critical angle and the refractive index of the liquid. The refractive index of the liquid can be calculated, and there is a corresponding relationship between the refractive index and its concentration. For nitric acid solution, its refractive index increases with increasing concentration. Refractometer 8 converts the measured refractive index into the concentration of nitric acid using a built-in calibration curve or formula. The data calculated by refractometer 8 is then transmitted to microcontroller 2. Microcontroller 2 receives the data sent by refractometer 8 through its built-in serial communication port. When the concentration of nitric acid in the waste acid solution reaches the set value, the operator opens the discharge valve and discharges the concentrated and purified nitric acid.

[0026] It is worth noting that the microcontroller 2 disclosed in the above embodiments can be an ATmega328P, the servo motor 638 can be an ECMA-C20604RS, the temperature detector 7 can be an OHR-E700, and the refractometer 8 can be an Atago PR-101α. The microcontroller 2 controls the servo motor 638, the temperature detector 7, the refractometer 8, and the electric heating wire 9 using methods commonly used in the prior art.

[0027] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A nitric acid recovery system for waste acid recovery, comprising a housing (1), a feed pipe (3) installed in an inlet on the upper side of the front end of the housing (1), a feed valve connected in series on the front side of the feed pipe (3), a discharge pipe (4) installed in a discharge outlet on the lower side of the right end of the housing (1), a discharge valve connected in series on the right side of the discharge pipe (4), and electric heating wires (9) respectively installed in cavities on the left and right sides inside the housing (1), characterized in that: It also includes a stirring mechanism (6); Stirring mechanism (6): It includes an output rod (61), stirring blades (62) and a disturbance component (63). The output rod (61) is rotatably connected to the middle of the top wall of the box (1). Stirring blades (62) are respectively provided on the lower side of the outer arc surface of the output rod (61). The disturbance component (63) is located at the upper end of the box (1). The output rod (61) is driven by the disturbance component (63).

2. The nitric acid recovery system for waste acid recovery according to claim 1, characterized in that: The front end of the housing (1) is equipped with a microcontroller (2). The input end of the microcontroller (2) is electrically connected to an external power source, and the input ends of the electric heating wire (9) are all electrically connected to the output end of the microcontroller (2).

3. The nitric acid recovery system for waste acid recovery according to claim 2, characterized in that: The disturbance component (63) includes a connecting plate (631), a disturbance plate (632), a protective cover (633), a horizontal plate (634), a fixing plate (635), a rack plate (636), a one-third gear (637), and a sealing rubber ring (639). The sealing rubber ring (639) is respectively disposed on the upper side of the left and right walls of the housing (1). The connecting plate (631) is slidably connected inside the two sealing rubber rings (639). The disturbance plate (632) is disposed on the lower side of the opposite inner end of the two connecting plates (631). The two disturbance plates (632) are respectively located on the left and right sides inside the housing (1). The protective cover (633) is disposed on the upper side of the housing (1). In the middle of the upper part of the box (1), horizontal plates (634) are slidably connected in the grooves opened in the middle of the left and right walls of the protective cover (633). The ends of the two horizontal plates (634) away from the center of the box (1) are fixedly connected to the upper side of the inner side of the adjacent horizontal connecting plate (631). The inner side of the two horizontal plates (634) is provided with fixing plates (635). The front and rear sides of the inner side of the two fixing plates (635) are respectively provided with rack plates (636). One-third gear (637) is set on the upper side of the outer arc surface of the output rod (61). The two rack plates (636) are installed in conjunction with the one-third gear (637).

4. The nitric acid recovery system for waste acid recovery according to claim 3, characterized in that: The disturbance component (63) also includes a servo motor (638), which is located in the middle of the upper part of the protective cover (633). The lower end of the output shaft of the servo motor (638) is fixedly connected to the upper end of the output rod (61), and the input end of the servo motor (638) is electrically connected to the output end of the microcontroller (2).

5. The nitric acid recovery system for waste acid recovery according to claim 2, characterized in that: Temperature detectors (7) are respectively installed on the upper and lower sides of the front end of the box (1). The probes of the two temperature detectors (7) are located inside the box (1) in the middle of the rear end. The upper temperature detector (7) is located on the lower side of the feed pipe (3). The temperature detectors (7) are bidirectionally electrically connected to the microcontroller (2).

6. The nitric acid recovery system for waste acid recovery according to claim 2, characterized in that: A refractometer (8) is provided on the front side of the upper end of the box (1). The probe at the lower end of the refractometer (8) is located inside the box (1). The refractometer (8) is bidirectionally electrically connected to the microcontroller (2).

7. The nitric acid recovery system for waste acid recovery according to claim 1, characterized in that: The four corners of the top wall of the box (1) are equipped with exhaust pipes (5), and exhaust valves are connected in series on the upper side of the four exhaust pipes (5).

Images