Automatic sodium sulfide dosing device

Abstract

The utility model discloses an automatic sodium sulfide dosing device which comprises a medicine storage hopper, a detachable sealing cover arranged at the top of the medicine storage hopper, a medicine discharging opening formed in the bottom of the medicine storage hopper, a medicine discharging valve installed on the medicine discharging opening, a drying net arranged at the lower end of the sealing cover, an alkaline drying agent placed in the drying net, and a conveying belt arranged on the medicine discharging opening. The output end of the conveying belt is connected to the stirring tank, the outer side of the conveying belt is coated with a sealing pipe, the two ends of the sealing pipe are connected to the medicine discharging opening and the stirring tank respectively, and the output end of the sealing pipe is provided with a medicine adding valve; the upper end of the stirring tank is communicated with a tail gas tank through a pipeline; and the pH sensor is connected with the dosing valve and a driving signal of the conveyor belt. According to the utility model, by arranging the medicine storage hopper for automatically adding sodium sulfide and the conveyor belt, the danger of feeding above the stirring tank by workers is reduced, and by arranging the tail gas tank, the leakage of hydrogen sulfide gas is reduced, the working environment is improved, and the potential safety hazard is reduced.

Description

Technical Field

[0001] This utility model belongs to the technical field of dosing devices and relates to an automatic sodium sulfide dosing device. Background Technology

[0002] The industrial wastewater treatment plant in the electronics industrial park requires the addition of sodium sulfide solution as a metal precipitant when treating mixed wastewater. Currently, the dosing tank, i.e., the stirred tank, requires manual transport of the reagent to the top of the stirred tank before pouring it into the tank, adding water, and stirring to dissolve it. Because sodium sulfide is highly alkaline, it can cause burns upon contact with skin or hair, and when dissolved in water, it undergoes ionization and hydrolysis reactions, producing sodium hydroxide and toxic and flammable hydrogen sulfide gas. Therefore, manual dosing not only affects the health of workers but also poses a significant safety hazard. Utility Model Content

[0003] To address the aforementioned problems, this invention proposes an automatic sodium sulfide dosing device, which effectively solves the problems in the prior art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] An automatic sodium sulfide dosing device includes:

[0006] A medicine storage hopper, wherein a removable sealing cover is provided on the top of the medicine storage hopper and a medicine inlet is provided at the bottom of the medicine storage hopper;

[0007] A drying mesh is detachably installed at the lower end of the sealing cover, and an alkaline desiccant is placed inside the drying mesh;

[0008] A dispensing valve, wherein the dispensing valve is installed at the dispensing port;

[0009] A conveyor belt, the input end of which is connected to the drug dispensing port, and the output end of which is connected to the mixing tank;

[0010] A sealing tube is wrapped around the outside of the conveyor belt, and its two ends are respectively connected to the drug inlet and the mixing tank;

[0011] A dosing valve is installed at the output end of the sealed tube;

[0012] The exhaust gas tank is connected to the upper end of the mixing tank via a pipeline, and the pipeline is equipped with a vacuum pump.

[0013] A pH sensor is installed in the mixing tank and is connected to the dosing valve and the drive signal of the conveyor belt.

[0014] Optionally, the exhaust gas tank contains a sodium hydroxide solution, the bottom of the exhaust gas tank is connected to a reflux pipe, the reflux pipe is connected to a reflux pump, and the output end of the reflux pump is connected to a stirring tank.

[0015] Optionally, the dispensing valve includes a baffle, and a plurality of drive rods arranged in a circular array are fixedly connected to the dispensing port. The output end of the drive rod is fixedly connected to the baffle, and the baffle blocks the dispensing port.

[0016] Optionally, a hemispherical component is fixedly installed at the upper end of the baffle, and an annular sealing ring is installed at the drug dispensing port.

[0017] Optionally, a metering tank is provided below the drug dispensing port, the discharge end of the metering tank is located above the feed inlet of the conveyor belt, a control valve is installed at the discharge end of the metering tank, and the metering tank is hoisted and installed by a weighing sensor.

[0018] Optionally, flexible connecting pipes are installed between the dispensing port and the upper end of the metering tank, and between the lower end of the metering tank and the sealing pipe.

[0019] Optionally, a discharge inclined pipe is fixedly installed on the side of the mixing tank, the output end of the conveyor belt is located at the upper end of the discharge inclined pipe, and the discharge inclined pipe is sealed to the sealing pipe.

[0020] Optionally, an atomizing nozzle is installed at the upper end of the exhaust gas tank, the atomizing nozzle is connected to the return pipe, and a control valve is installed on the return pipe in both the direction of the atomizing nozzle and the direction of the mixing tank.

[0021] Optionally, a hydrogen sulfide concentration sensor is installed on the connecting pipe between the mixing tank and the exhaust gas tank, and the exhaust gas tank is equipped with an electronically controlled exhaust valve.

[0022] Compared with the prior art, the present invention has the following beneficial effects;

[0023] 1. By setting up an automatic sodium sulfide storage hopper and conveyor belt, the danger of workers feeding materials above the mixing tank is reduced, and by setting up an exhaust gas tank, the leakage of hydrogen sulfide gas is reduced, thus improving the working environment and reducing safety hazards;

[0024] 2. After hydrogen sulfide gas is generated, it is pumped into the tail gas tank. Sodium hydroxide solution is placed in the tail gas tank. After the sodium hydroxide solution comes into contact with the hydrogen sulfide gas, sodium sulfide and water are generated. The sodium sulfide solution is returned to the stirring tank by the return pump, which is conducive to the efficient utilization of sodium sulfide. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0026] Figure 2This is a schematic diagram of the metering tank portion of an embodiment of the present utility model;

[0027] Figure 3 This is a schematic diagram of the exhaust gas tank portion of an embodiment of this utility model.

[0028] Reference numerals: 1. Storage hopper; 10. Mixing tank; 11. Sealing cap; 12. Discharge port; 13. Drying mesh; 21. Discharge valve; 211. Baffle; 212. Drive rod; 213. Hemispherical component; 214. Flexible connecting pipe; 22. Dosing valve; 3. Conveyor belt; 31. Sealing pipe; 32. Inclined discharge pipe; 4. Exhaust gas tank; 41. Vacuum pump; 42. Return pipe; 43. Return pump; 44. Atomizing nozzle; 45. Electrically controlled exhaust valve; 46. Dispersion plate; 51. pH sensor; 52. Hydrogen sulfide concentration sensor; 6. Metering tank; 61. Weighing sensor. Detailed Implementation

[0029] 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.

[0030] Please see Figures 1 to 3 This invention discloses an automatic sodium sulfide dosing device, comprising a storage hopper 1, a removable sealing cover 11 at the top of the storage hopper 1, a dispensing port 12 at the bottom of the storage hopper 1, a dispensing valve 21 installed at the dispensing port 12, a drying net 13 detachably installed at the lower end of the sealing cover 11, an alkaline desiccant placed inside the drying net 13, a conveyor belt 3 installed at the dispensing port 12, the output end of the conveyor belt 3 connected to a mixing tank 10, a sealing tube 31 covering the outside of the conveyor belt 3, the two ends of the sealing tube 31 being connected to the dispensing port 12 and the mixing tank 10 respectively, a dosing valve 22 installed at the output end of the sealing tube 31, a tail gas tank 4 connected to the upper end of the mixing tank 10 via a pipe, a vacuum pump 41 installed in the pipe, a pH sensor 51 installed inside the mixing tank 10, and the pH sensor 51 being connected to the dosing valve 22 and the drive signal of the conveyor belt 3.

[0031] Specifically, a storage hopper 1 and a tail gas tank 4 are installed on the outside of the mixing tank 10. The storage hopper 1 contains weighed sodium sulfide. When it needs to be added, it is transferred to the mixing tank 10 via the conveyor belt 3. Hydrogen sulfide is generated in the mixing tank 10 during the mixing process, and it is drawn into the tail gas tank 4 by the vacuum pump 41 to reduce leakage.

[0032] In this way, by setting up an automatic sodium sulfide storage hopper 1 and a conveyor belt 3, the danger of workers feeding materials above the mixing tank 10 is reduced, and by setting up an exhaust gas tank 4, the leakage of hydrogen sulfide gas is reduced, the working environment is improved, and safety hazards are reduced.

[0033] In some feasible embodiments, the storage hopper 1 is a container for storing sodium sulfide. In this embodiment, it is set to a square hopper shape with a conical bottom. The dispensing port 12 is cylindrical. The sealing cover 11 is detachably fixed to the top of the storage hopper 1 by means of bolts or buckles. For easy opening, the sealing cover 11 can be hinged on one side and a hydraulic rod can be installed for opening. The drying net 13 is a rectangular net bag. An alkaline desiccant is placed inside the drying net 13. Together with the sealing cover 11 and the dispensing valve 21, it reduces the humidity inside the storage hopper 1 and reduces the reaction between sodium sulfide and moisture in the air. The alkaline desiccant can be sodium hydroxide, which is placed in a filter bag or other bag with fine pores and placed on the drying net 13 to absorb moisture in the air.

[0034] The sealing tube 31 is a rectangular tube, and the conveyor belt 3 is a commonly used belt conveyor. The conveyor belt 3 is installed inside the sealing tube 31 to improve the sealing performance and further reduce the reaction between sodium sulfide and moisture in the air. In other embodiments of this application, depending on the actual transfer needs between equipment, the conveyor belt 3 can also be selected as a screw conveyor or a combination of belt conveyor and elevator, etc. A pH sensor 51 is installed in the mixing tank 10. In conjunction with other processes, when the pH value of the solution in the mixing tank 10 reaches 10-11, the conveyor belt 3 is controlled to feed material. The alkaline environment can reduce the formation of hydrogen sulfide.

[0035] The exhaust gas tank 4 is a circular tank and is set as a sealed pressure tank for storing hydrogen sulfide gas. A one-way valve is installed on the pipeline connecting the exhaust gas tank 4 and the mixing tank 10 to prevent exhaust gas backflow.

[0036] In some feasible ways, a steel frame structure can be set up on the ground, and the medicine storage hopper 1, mixing tank 10, exhaust gas tank 4, etc. can be fixedly installed on the steel frame structure.

[0037] As one specific embodiment of the automatic sodium sulfide dosing device provided in the application, please refer to Figure 3 The exhaust gas tank 4 contains a sodium hydroxide solution. The bottom of the exhaust gas tank 4 is connected to a return pipe 42, which is connected to a return pump 43. The output end of the return pump 43 is connected to the stirring tank 10.

[0038] Overall, after hydrogen sulfide gas is generated, it enters the tail gas tank 4 through the vacuum pump 41. Sodium hydroxide solution is placed in the tail gas tank 4. After the sodium hydroxide solution comes into contact with the hydrogen sulfide gas, sodium sulfide and water are generated. The sodium sulfide solution is returned to the stirring tank 10 through the return pump 43, which is conducive to the efficient utilization of sodium sulfide.

[0039] Furthermore, an atomizing nozzle 44 is installed at the upper end of the exhaust gas tank 4. The atomizing nozzle 44 is connected to the return pipe 42. Control valves are installed on the return pipe 42 in both the direction of the atomizing nozzle 44 and the mixing tank 10.

[0040] It should be understood that hydrogen sulfide enters the exhaust gas tank 4 in gaseous form. By setting up atomizing nozzles 44, the sodium hydroxide solution can come into contact with the hydrogen sulfide gas to a greater extent and react, thereby improving the elimination rate of hydrogen sulfide.

[0041] In some feasible configurations, a perforated plate 46 is installed near the bottom of the exhaust gas tank 4 as a dispersion plate 46, with the outlet end of the inlet pipe located below the dispersion plate 46. This allows the hydrogen sulfide gas to be dispersed in the sodium hydroxide solution under the action of the dispersion plate 46, increasing contact and facilitating further contact reaction of the gas overflowing from the sodium hydroxide solution through the atomizing nozzle 44, thereby improving the hydrogen sulfide elimination rate. A three-way pipe is installed at the outlet end of the reflux pump 43, connecting the atomizing nozzle 44 and the stirring tank 10. A control valve is installed on the pipe connecting the atomizing nozzle 44 and the stirring tank 10, controlling the flow of the solution by opening and closing the valve.

[0042] In some feasible embodiments, a hydrogen sulfide concentration sensor 52 is installed on the connecting pipe between the mixing tank 10 and the exhaust gas tank 4, and an electrically controlled exhaust valve 45 is installed on the exhaust gas tank 4. By setting the hydrogen sulfide concentration sensor 52, the concentration of hydrogen sulfide in the gas inside the mixing tank 10 is detected. When the hydrogen sulfide concentration is within the emission limit, the electrically controlled exhaust valve 45 is opened to exhaust the gas. When the hydrogen sulfide concentration exceeds the safety limit, the electrically controlled exhaust valve 45 is closed for subsequent treatment.

[0043] As another specific embodiment of the automatic sodium sulfide dosing device provided in the application, the dosing valve 21 includes a baffle 211, and a dosing port 12 is fixedly connected to a plurality of drive rods 212 arranged in a circular array. The output end of the drive rods 212 is fixedly connected to the baffle 211, and the baffle 211 blocks the dosing port 12.

[0044] Depending on the specific application scenario, by setting up a baffle 211 and a drive rod 212, and by providing pressure through the drive rod 212, a seal is formed between the baffle 211 and the dispensing port 12, further reducing the possibility of sodium sulfide reacting with moisture in the air.

[0045] Furthermore, a hemispherical component 213 is fixedly installed on the upper end of the baffle 211, and an annular sealing ring is installed on the drug outlet 12.

[0046] It should be understood that by setting the hemispherical component 213 and the annular sealing ring, the pressure provided by the drive rod 212 gradually compresses the hemispherical component 213 and the annular sealing ring to seal, further improving the sealing performance. At the same time, the hemispherical component 213 facilitates the falling of sodium sulfide, reducing the possibility of accumulation on the baffle 211.

[0047] Further, please refer to Figure 1 and Figure 2 A metering tank 6 is installed below the drug inlet 12. The discharge end of the metering tank 6 is located above the feed inlet of the conveyor belt 3. A control valve is installed at the discharge end of the metering tank 6. The metering tank 6 is hoisted and installed via a weighing sensor 61.

[0048] It should be understood that by setting up the metering tank 6, the medicine in the medicine storage hopper 1 is weighed, reducing the weighing process before adding medicine, further reducing workers' contact with sodium sulfide, and reducing safety hazards.

[0049] Furthermore, flexible connecting pipes 214 are installed between the drug dispensing port 12 and the upper end of the metering tank 6, and between the lower end of the metering tank 6 and the sealing pipe 31.

[0050] It should be understood that by setting up the flexible connecting pipe 214, the sealing performance is improved, reducing the possibility of sodium sulfide reacting with moisture in the air during transportation.

[0051] In some feasible configurations, the metering tank 6 is a circular tank with multiple steel wire ropes arranged in a circumferential array at its upper end. The metering tank 6 is suspended from a steel frame structure or other installation structure by these steel wire ropes. A tension-type load cell 61 is installed in the middle of each steel wire rope to weigh the sodium sulfide entering the metering tank 6. The control valve at the discharge end of the metering tank 6 can be an electrically controlled flap valve. The flexible connecting pipe 214 is used only to isolate air and can be a membrane duct, or, depending on the connection requirements, can be fabricated and installed on-site by cutting and gluing plastic film.

[0052] As another specific embodiment of the automatic sodium sulfide dosing device provided in the application, a feeding inclined pipe 32 is fixedly installed on the side of the mixing tank 10, the output end of the conveyor belt 3 is located at the upper end of the feeding inclined pipe 32, and the feeding inclined pipe 32 is sealed and connected to the sealing pipe 31.

[0053] It should be understood that by setting the feed inclination pipe 32, it is convenient for the conveyor belt 3 to dock with the mixing tank 10, which is beneficial to forming a seal between the output end of the conveyor belt 3 and the mixing tank 10.

[0054] In some feasible embodiments, the dosing valve 22 is installed on the feed incline 32, and the dosing valve 22 may have the same structure as the feed valve 21.

[0055] In some feasible methods, vibratory motors are installed at locations such as the medicine storage hopper 1, the metering tank 6, and the feeding inclined pipe 32 to facilitate feeding.

[0056] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic sodium sulfide dosing device, characterized in that, include: A medicine storage hopper, wherein a removable sealing cover is provided on the top of the medicine storage hopper and a medicine inlet is provided at the bottom of the medicine storage hopper; A drying mesh is detachably installed at the lower end of the sealing cover, and an alkaline desiccant is placed inside the drying mesh; A dispensing valve, wherein the dispensing valve is installed at the dispensing port; A conveyor belt, the input end of which is connected to the drug dispensing port, and the output end of which is connected to the mixing tank; A sealing tube is wrapped around the outside of the conveyor belt, and its two ends are respectively connected to the drug inlet and the mixing tank; A dosing valve is installed at the output end of the sealed tube; The exhaust gas tank is connected to the upper end of the mixing tank via a pipeline, and the pipeline is equipped with a vacuum pump. A pH sensor is installed in the mixing tank and is connected to the dosing valve and the drive signal of the conveyor belt.

2. The automatic sodium sulfide dosing device according to claim 1, characterized in that: The exhaust gas tank contains a sodium hydroxide solution, and a reflux pipe is connected to the bottom of the exhaust gas tank. The reflux pipe is connected to a reflux pump, and the output end of the reflux pump is connected to a stirring tank.

3. The automatic sodium sulfide dosing device according to claim 1, characterized in that: The dispensing valve includes a baffle, and a plurality of drive rods arranged in a circular array are fixedly connected to the dispensing port. The output end of the drive rod is fixedly connected to the baffle, and the baffle blocks the dispensing port.

4. An automatic sodium sulfide dosing device according to claim 3, characterized in that: A hemispherical component is fixedly installed at the upper end of the baffle, and an annular sealing ring is installed at the drug dispensing port.

5. An automatic sodium sulfide dosing device according to claim 4, characterized in that: A metering tank is installed below the drug dispensing port. The discharge end of the metering tank is located above the feed inlet of the conveyor belt. A control valve is installed at the discharge end of the metering tank. The metering tank is hoisted and installed by a weighing sensor.

6. An automatic sodium sulfide dosing device according to claim 5, characterized in that: Flexible connecting pipes are installed between the dispensing port and the upper end of the metering tank, and between the lower end of the metering tank and the sealing pipe.

7. An automatic sodium sulfide dosing device according to claim 1, characterized in that: A discharge inclined pipe is fixedly installed on the side of the mixing tank, and the output end of the conveyor belt is located at the upper end of the discharge inclined pipe. The discharge inclined pipe is sealed and connected to the sealing pipe.

8. An automatic sodium sulfide dosing device according to claim 2, characterized in that: An atomizing nozzle is installed at the upper end of the exhaust gas tank. The atomizing nozzle is connected to the return pipe. Control valves are installed on both the atomizing nozzle and the mixing tank in the return pipe.

9. An automatic sodium sulfide dosing device according to claim 1, characterized in that: A hydrogen sulfide concentration sensor is installed on the pipeline connecting the mixing tank and the exhaust gas tank, and the exhaust gas tank is equipped with an electronically controlled exhaust valve.

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