A cooling system for separate treatment of acid-containing wastewater from a sulfuric acid plant

Abstract

The utility model discloses a kind of sulphuric acid plant containing acid wastewater is handled cooling system of quality, including humidifying cylinder to sulphuric acid residue cooling, the upper portion of the gas outlet of humidifying cylinder is provided with dust removal cavity, the dust removal spray head in this dust removal cavity is connected with the spray pipe of humidifying cylinder and water supply system, dust removal cavity lower end is connected with inclined plate sedimentation tank through drain pipe, the lower portion of dust removal cavity is provided with settling tube, the settling tube is connected with inclined plate sedimentation tank lower portion sludge pipe by lower portion pipeline, and the water collecting tank of water supply system is connected with one side of inclined plate sedimentation tank, setting, the utility model is handled by the dust-containing wastewater of dust removal cavity and the cooling water of humidifying cylinder quality, and setting acidic neutralization system automatically adjusts pH value, effectively solve the problems, such as water quality deterioration, spray pipe blockage, cooling efficiency decline in prior art, with the advantages of improving equipment service life, ensuring production stable operation etc.

Description

Technical Field

[0001] This utility model relates to the field of acidic wastewater treatment, specifically to a cooling system for the differentiated treatment of acidic wastewater from a sulfuric acid plant. Background Technology

[0002] In the sulfuric acid production process from sulfur concentrate, the resulting sulfuric acid slag is typically cooled using a humidifying drum. In existing technology, the humidifying drum uses top-mounted spray pipes to cool the sulfuric acid slag, which reaches temperatures as high as 180℃–200℃, reducing its temperature to below 75℃. However, this method has significant technical drawbacks: when the humidifying drum discharges slag from the outlet, it generates a large amount of dust. This dust enters the dust removal chamber through the air outlet. Although it can be removed by the umbrella-shaped water film formed by the dust removal nozzles, the dust-laden wastewater is directly discharged into the humidifying drum's collection tank through the drain pipe. There, it mixes with cooling water from the lower water tank of the humidifying drum and is recycled (e.g., ...). Figure 2 (As shown).

[0003] This mixing method leads to severe deterioration of the water quality in the collection tank. The mixed wastewater contains a large number of impurities, causing frequent blockages in the spray pipes above the humidifying drum, resulting in uneven spraying and ultimately reduced cooling efficiency and increased slag discharge temperature, severely impacting production efficiency and equipment lifespan. Furthermore, the existing system lacks an effective acid neutralization control mechanism and cannot automatically adjust the pH value according to changes in water quality, further exacerbating equipment corrosion and scaling problems. Utility Model Content

[0004] To address the aforementioned problems, this invention provides a cooling system for the differentiated treatment of acidic wastewater from sulfuric acid plants.

[0005] This utility model is achieved through the following technical solution:

[0006] This application provides a cooling system for the differentiated treatment of acidic wastewater in a sulfuric acid plant, including a humidifying drum for cooling sulfuric acid slag. A dust removal chamber is provided above the air outlet of the humidifying drum. The dust removal nozzles in the dust removal chamber are connected to the spray pipes of the humidifying drum and the water supply system. The lower end of the dust removal chamber is connected to an inclined plate sedimentation tank through a drain pipe. A settling pipe is provided at the lower part of the dust removal chamber. The settling pipe is connected to the sludge pipe at the bottom of the inclined plate sedimentation tank through a lower pipeline. One side of the inclined plate sedimentation tank is connected to the water collection tank of the water supply system.

[0007] Furthermore, this application also proposes that the water supply system includes a water collection tank, a booster pump is installed in the water collection tank, the booster pump is connected to the dust removal nozzle and spray pipe through the water supply pipe, and the water collection tank is connected to the upper part of the inclined plate sedimentation tank through the overflow port.

[0008] Furthermore, this application also proposes that the water collection tank is equipped with an acid neutralization system, which includes a reagent tank. The reagent tank adds reagent to the water collection tank through a dosing pump. The dosing pump is electrically connected to a controller, and the controller is electrically connected to a pH meter of the water collection tank.

[0009] Furthermore, this application also proposes that the settling pipe is located at the lower part of the connection between the drainage pipe and the dust removal chamber, and that control valves are installed at the bottom of the settling pipe and the outlet end of the sludge pipe, and that control valves are installed on the drainage pipe.

[0010] Furthermore, this application also proposes that the spray pipes are configured as multiple pipes located at the top of the humidifying roller and have multiple spray holes at the bottom.

[0011] Furthermore, this application also proposes that the cooling water in the water pool below the humidifying drum is transported to the water collection pool for recycling through a cooling water pipe.

[0012] Compared with existing technologies, the advantages of this utility model are: by treating the dust-laden wastewater in the dust removal chamber and the cooling water in the humidifying drum separately, and by setting an acid neutralization system to automatically adjust the pH value, this utility model effectively solves the problems of water quality deterioration, spray pipe blockage, and cooling efficiency reduction in existing technologies, and has the advantages of improving equipment service life and ensuring stable production operation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the system of this utility model;

[0014] Figure 2 This is a schematic diagram of the prior art of this utility model;

[0015] In the diagram: 1. Humidifying roller, 101. Cooling water pipe, 2. Air outlet, 3. Dust removal chamber, 301. Settling pipe, 4. Drainage pipe, 5. Inclined plate sedimentation tank, 6. Sludge pipe, 7. Water collection tank, 8. Overflow port, 9. Booster pump, 10. Water supply pipe, 11. Control valve, 12. Dust removal nozzle, 13. Spray pipe, 14. Chemical tank, 15. Dosing pump, 16. pH meter, 17. Controller. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0017] like Figure 1 As shown, this application proposes a cooling system for the differentiated treatment of acidic wastewater in a sulfuric acid plant, including a humidifying drum for cooling sulfuric acid slag. A dust removal chamber is provided above the air outlet of the humidifying drum, and dust removal nozzles in the dust removal chamber are connected to the spray pipes of the humidifying drum and a water supply system. The lower end of the dust removal chamber is connected to an inclined plate sedimentation tank through a drain pipe. A settling pipe is provided at the lower part of the dust removal chamber, and the settling pipe is connected to the sludge pipe at the bottom of the inclined plate sedimentation tank through a lower pipeline. One side of the inclined plate sedimentation tank is connected to the water collection tank of the water supply system.

[0018] The humidifying drum is used to cool the high-temperature sulfuric acid slag. The spray pipes can be single or multiple, preferably multiple pipes arranged in parallel. The spray holes can be circular or fan-shaped openings, with a preferred diameter range of 2-5 mm. The dust removal chamber is cylindrical, and the settling pipes can be designed with a conical structure to promote particle settling, with an inclination angle preferably of 30-45 degrees. The inclined plate sedimentation tank uses PP or PVC inclined plates, with a plate spacing controlled at 50-100 mm. The drainage pipes and sludge pipes can be made of corrosion-resistant UPVC or PPR material, with pipe diameters designed from DN50 to DN150 based on flow rate.

[0019] This technical solution effectively solves the problem of spray pipe blockage caused by water quality deterioration in traditional systems by treating dust removal wastewater and cooling water separately. After separation in an inclined plate sedimentation tank, the clean water is reused in the dust removal system, while sludge is discharged separately, avoiding the accumulation of impurities in the system. The settling pipes can separate large particles in advance, reducing the load on the inclined plate sedimentation tank. The system achieves classified treatment of wastewater of different qualities through physical separation, ensuring the stable operation of the spray system and improving cooling efficiency. Compared with existing technologies, this solution has advantages such as simple structure, stable operation, and convenient maintenance.

[0020] Furthermore, this application also proposes that the water supply system includes a water collection tank, a booster pump is installed in the water collection tank, the booster pump is connected to the dust removal nozzle and spray pipe through the water supply pipe, and the water collection tank is connected to the upper part of the inclined plate sedimentation tank through the overflow port.

[0021] Specifically, a centrifugal pump can be used as the booster pump, and its head must meet the pressure requirements for delivering water from the collection tank to the dust removal nozzles and spray pipes. The water supply pipe can be a corrosion-resistant UPVC pipe or a plastic-lined steel pipe, with a diameter designed from DN50 to DN100 according to the flow rate requirements. The overflow outlet is located on the upper part of the side wall of the collection tank, its height lower than the inlet of the dust removal chamber drain pipe, ensuring that the effluent from the inclined plate sedimentation tank can flow back to the collection tank by gravity. As a preferred embodiment, the overflow outlet can be equipped with an adjustable-height weir plate for easy control of the water level in the collection tank.

[0022] Therefore, this technical solution uses a pressure pump to continuously supply water from the collection tank to the dust removal nozzles and spray pipes, forming a circulating water path. When the water level in the inclined plate sedimentation tank exceeds the overflow port height, the supernatant water enters the collection tank through the overflow port for reuse, preventing impurities from accumulating in the collection tank. This design effectively solves the problem of spray pipe blockage caused by the deposition of impurities in mixed wastewater in the prior art, and by maintaining stable water quality in the collection tank, it ensures the uniformity and cooling efficiency of the spray system.

[0023] Furthermore, this application also proposes that the water collection tank is equipped with an acid neutralization system, which includes a reagent tank. The reagent tank adds reagent to the water collection tank through a dosing pump. The dosing pump is electrically connected to a controller, and the controller is electrically connected to a pH meter of the water collection tank.

[0024] Specifically, the acid neutralization system stores neutralizing agents in a tank, and a dosing pump delivers a measured amount of the agent to the collection tank according to the controller's instructions. A pH meter monitors the pH of the collection tank in real time and feeds the data back to the controller. The controller automatically adjusts the operating parameters of the dosing pump by comparing the actual pH value with the target neutralization value of 7 using a preset program. As a preferred embodiment, the neutralizing agent can be a sodium hydroxide solution, the dosing pump is a metering pump for precise dosing, and the pH meter is an online sensor for continuous monitoring.

[0025] Therefore, this technical solution achieves automatic pH adjustment of the collection tank through a closed-loop control system. When the dust-laden wastewater (sulfuric acid slag dust is acidic) from the humidifying drum mixes with the cooling water, causing water acidification, the pH meter detects an abnormal acidity / alkalinity. The controller immediately starts the dosing pump to inject neutralizing agent, restoring the wastewater's pH to the neutral range. This not only effectively prevents acidic wastewater from corroding the equipment but also avoids scaling and clogging of the spray pipes due to water quality deterioration. Compared with manual dosing, this system has advantages such as fast response speed, high control precision, and good operational stability.

[0026] Furthermore, this application also proposes that the settling pipe is located at the lower part of the connection between the drainage pipe and the dust removal chamber, and that control valves are installed at the bottom of the settling pipe and the outlet end of the sludge pipe, and that control valves are installed on the drainage pipe.

[0027] A settling pipe is located below the connection between the dust collection chamber and the drain pipe, used to collect and guide the solid particles that settle during the dust collection process. The control valves can be manual ball valves. The ball valve at the bottom of the settling pipe is used for periodic discharge of sediment, the control valve at the sludge pipe outlet regulates the sludge discharge flow rate, and the control valve on the drain pipe controls the discharge rate of dust-laden wastewater. Specifically, the settling pipe can be made of 316L stainless steel, with a diameter of DN150-DN200, and an inclination angle maintained at 30°-45° to facilitate particle sliding. As a preferred embodiment, the control valve is equipped with a position sensor and transmits the signal to the central control system.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A cooling system for the differentiated treatment of acidic wastewater in a sulfuric acid plant, comprising a humidifying drum (1) for cooling sulfuric acid slag, wherein a dust removal chamber (3) is provided above the air outlet (2) of the humidifying drum (1), and the dust removal nozzles (12) in the dust removal chamber (3) are connected to the spray pipes (13) of the humidifying drum (1) and a water supply system, characterized in that: The lower end of the dust removal chamber (3) is connected to the inclined plate sedimentation tank (5) through the drain pipe (4). A settling pipe (301) is provided at the lower part of the dust removal chamber (3). The settling pipe (301) is connected to the lower sludge pipe (6) of the inclined plate sedimentation tank (5) through the lower pipeline. One side of the inclined plate sedimentation tank (5) is connected to the water collection tank (7) of the water supply system.

2. The sulfuric acid plant acid-containing wastewater separation and cooling system according to claim 1, characterized in that: The water supply system includes a water collection tank (7), a booster pump (9) is installed in the water collection tank (7), the booster pump (9) is connected to the dust removal nozzle (12) and the spray pipe (13) through the water supply pipe (10), and the water collection tank (7) is connected to the upper part of the inclined plate sedimentation tank (5) through the overflow port (8).

3. The sulfuric acid plant acid-containing wastewater separation and cooling system according to claim 2, characterized in that: The water collection tank (7) is equipped with an acid neutralization system, which includes a reagent tank (14). The reagent tank (14) adds reagent to the water collection tank (7) through a dosing pump (15). The dosing pump (15) is electrically connected to a controller (17), and the controller (17) is electrically connected to a pH meter (16) of the water collection tank (7).

4. The sulfuric acid plant acid-containing wastewater separation and cooling system according to claim 1, characterized in that: The settling pipe (301) is located at the lower part of the connection between the drain pipe (4) and the dust removal chamber (3). A control valve (11) is installed at the bottom of the settling pipe (301) and the outlet end of the sludge pipe (6). A control valve (11) is installed on the drain pipe (4).

5. A cooling system for the differentiated treatment of acidic wastewater from a sulfuric acid plant according to claim 1, characterized in that: The spray pipe (13) is configured as multiple pipes located at the top of the humidifying roller (1) and has multiple spray holes at the bottom.

6. The cooling system for the differentiated treatment of acidic wastewater from a sulfuric acid plant according to claim 1, characterized in that: Cooling water in the pool below the humidifying roller (1) is transported to the water collection pool (7) through the cooling water pipe (101) for recycling.

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