A device for high-efficiency desulfurization of electrolytic aluminum

Abstract

The utility model relates to electrolytic aluminium production technical field especially relates to a kind of device of electrolytic aluminium high efficiency desulfurization.A kind of device of electrolytic aluminium high efficiency desulfurization, including desulfurizing tower, process water tank, flue gas waste heat system, temperature detection device, electric valve;The flue gas waste heat system includes the flue gas waste heat system entrance, the outlet of the flue gas waste heat system is connected to the water replenishing port of desulfurizing tower and the top of process water tank by pipeline, for the water after heating is transported to desulfurizing tower and process water tank, the top of process water tank and the water replenishing port of desulfurizing tower are communicated, and the bottom of process water tank and the bottom inlet of desulfurizing tower are communicated by pipeline.The utility model is heated slurry and process water to suitable temperature by using flue gas waste heat, combines real-time monitoring and alarm control, can improve electrolytic aluminium desulfurization efficiency, ensure standard discharge, can realize energy comprehensive utilization, reduce energy consumption waste.

Description

Technical Field

[0001] This utility model relates to the field of electrolytic aluminum production technology, and in particular to a device for high-efficiency desulfurization of electrolytic aluminum. Background Technology

[0002] In the electrolytic aluminum production process, desulfurization is crucial for controlling pollutant emissions and meeting environmental protection requirements. Currently, electrolytic aluminum desulfurization systems typically employ dust collectors to react sulfur dioxide in the electrolytic flue gas with alumina powder, thereby reducing the sulfur dioxide concentration. However, this method has low desulfurization efficiency and is difficult to achieve ultra-low emission standards.

[0003] Therefore, the industry mostly adopts wet desulfurization equipment, which uses limestone powder slurry as the desulfurization absorbent and removes SO2 from flue gas through a traditional spray-type wet desulfurization process. Specifically, the flue gas is washed in the desulfurization tower with a large amount of washing liquid containing alkaline absorbent in either forward or reverse directions, thereby absorbing SO2 and reducing the concentration of SO2 in the flue gas after washing.

[0004] However, existing systems have significant drawbacks: the process water and rinsing / washing slurry used are mostly at room temperature, resulting in low efficiency in SO2 absorption and reaction. This is especially true in low-temperature environments such as winter, where effective reaction with SO2 in the flue gas becomes even more difficult. This problem not only leads to significant consumption of the raw slurry (limestone slurry), resulting in waste of electricity and materials, but also reduces overall desulfurization efficiency, causing the exhaust gas to fail to meet environmental standards and negatively impacting stable production. Therefore, developing a device that can improve the desulfurization efficiency of electrolytic aluminum has become an urgent need for the industry. Utility Model Content

[0005] The purpose of this invention is to provide a device for high-efficiency desulfurization of electrolytic aluminum to solve the problems mentioned in the background art.

[0006] A device for high-efficiency desulfurization of electrolytic aluminum includes a desulfurization tower, a process water tank, a flue gas waste heat system, a temperature detection device, and electric valves;

[0007] The flue gas waste heat system includes an inlet and an outlet connected to the water supply port of the desulfurization tower and the top of the process water tank via a pipeline. The outlet is used to supply heated water to the desulfurization tower and the process water tank. The top of the process water tank is connected to the water supply port of the desulfurization tower, and the bottom of the process water tank is connected to the bottom inlet of the desulfurization tower via a pipeline.

[0008] The temperature detection devices are installed in the process water tank and the desulfurization tower, respectively.

[0009] The electric valve is located on the pipeline connecting the outlet of the flue gas waste heat system to the desulfurization tower and the process water tank.

[0010] Furthermore, the temperature detection device is located 2 meters away from the desulfurization tower and is connected to the host computer.

[0011] Furthermore, the temperature detection device has real-time detection and signal transmission functions, which detects the temperature of the slurry in the process water tank and desulfurization tower in real time and transmits the temperature information to the host computer.

[0012] Furthermore, the electric valve also includes a pressure sensor and a flow sensor.

[0013] Furthermore, the temperature detection device also includes an alarm module, which can issue an alarm when relevant parameters are abnormal.

[0014] Furthermore, the top of the desulfurization tower is an arc-shaped pipe, with the pipe outlet facing horizontally.

[0015] Furthermore, the inner diameter of the pipe is 300-500mm, and the pipe material is S30408 ​​stainless steel.

[0016] Furthermore, the outer wall of the pipe is provided with a 5mm thick rock wool insulation layer, which can control the temperature of the liquid inside the pipe.

[0017] Furthermore, the flue gas waste heat system is a heat exchanger that can use the waste heat of flue gas to heat fire water. The heated water can be used to heat the slurry and process water in the desulfurization tower and process water tank, and can also be supplied to the living area and the front area of ​​the plant as hot water.

[0018] Furthermore, the process water tank is a rectangular parallelepiped-shaped tank.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] 1. Improve desulfurization efficiency and environmental compliance: The process water and slurry are heated to a suitable reaction temperature (around 35°C) by the waste heat system of flue gas, which promotes the full reaction of SO2 in the slurry and flue gas, reduces the consumption of limestone slurry, avoids the problem of low desulfurization efficiency due to unsuitable temperature, and ensures that the exhaust gas meets environmental standards.

[0021] 2. Ensure stable system operation and fault early warning: With the help of temperature detection device (with alarm function), pressure and flow sensor real-time monitoring and signal transmission, abnormal parameters can be detected in time and alarms can be triggered. Operators can make timely adjustments through the host computer, prevent environmental data failures in advance, reduce the risk of equipment misoperation and downtime, and improve production continuity.

[0022] 3. Achieve efficient energy utilization and cost control: The hot water heated by the flue gas waste heat system can not only meet the needs of the desulfurization process, but also be supplied to the living area and the front area of ​​the plant, thereby improving energy utilization. At the same time, by precisely controlling parameters such as temperature and pressure, the waste of electricity and materials can be reduced, thereby lowering production and operating costs. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a diagram of a device for high-efficiency desulfurization of electrolytic aluminum.

[0025] Figure 2 A side view of a device for high-efficiency desulfurization of electrolytic aluminum;

[0026] The components include: 1. Desulfurization tower; 2. Process water tank; 3. Flue gas waste heat system; 4. Temperature detection device; 5. Electric valve; 6. Pipeline; 11. Desulfurization tower water inlet; 12. Desulfurization tower bottom water inlet; and 31. Flue gas waste heat system inlet. Detailed Implementation

[0027] 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. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] The following is in conjunction with the appendix Figure 1 To be continued Figure 2 The present invention will be described in detail with reference to specific embodiments:

[0029] like Figure 1-2 As shown, the high-efficiency desulfurization device for electrolytic aluminum in this embodiment mainly consists of a desulfurization tower 1, a process water tank 2, a flue gas waste heat system 3 (using a flue gas waste heat exchanger), a temperature detection device 4, electric valves 5, and supporting pipelines 6. All components are connected via pipelines 6 to form a closed-loop system, achieving efficient removal of SO2 from the electrolytic aluminum flue gas.

[0030] Flue gas waste heat system 3: A plate heat exchanger is used as the core equipment of the flue gas waste heat system 3. Its inlet 31 is connected to the high-temperature flue gas (temperature approximately 150-200℃) generated during the electrolytic aluminum production process. The waste heat of the flue gas is used to heat the introduced fire water, and the water temperature is stabilized at 80℃ after heating. The heat exchanger outlet is connected to the desulfurization tower water supply inlet 11 and the top of the process water tank 2 via pipes 6, respectively, for transporting the heated hot water.

[0031] Process water tank 2: A rectangular stainless steel tank (5m×3m×2m) is used. The top is connected to the desulfurization tower water inlet 11 via pipe 6, and the bottom is connected to the desulfurization tower bottom inlet 12 via pipe 6, forming a slurry circulation channel. A temperature detection device 4 is installed inside the tank to monitor the temperature of the process water and slurry mixture in real time.

[0032] Desulfurization tower 1: The tower body is 15m high, and a temperature detection device 4 is installed 2 meters inside. This device has an alarm function and is connected to a host computer, which can monitor the temperature of the slurry inside the tower in real time and transmit the data to the host computer. The top of desulfurization tower 1 is equipped with an arc-shaped pipe 6 (the outlet of pipe 6 faces horizontally) for discharging the treated flue gas.

[0033] Pipeline 6 and Valves: Pipeline 6, connecting the outlet of the flue gas waste heat system 3 to the desulfurization tower 1 and process water tank 2, is made of S30408 ​​stainless steel with an inner diameter of 400mm (within the range of 300-500mm). The outer wall of pipeline 6 is wrapped with a 5mm thick rock wool insulation layer to reduce heat loss and control the liquid temperature inside pipeline 6. The electric valve 5 installed on pipeline 6 integrates pressure and flow sensors, which can monitor the pressure and flow rate of the hot water inside pipeline 6 in real time.

[0034] Temperature detection device 4: In addition to real-time detection and signal transmission functions (transmitting the temperature of the slurry in process water tank 2 and desulfurization tower 1 to the host computer), it is also equipped with an alarm module. When the temperature, pressure, flow rate and other parameters exceed the set threshold, an alarm will be issued through the sound and light alarm device, and an electronic signal will be sent to the operator's host computer at the same time.

[0035] Working principle:

[0036] The electrolytic aluminum flue gas enters the heat exchanger of the flue gas waste heat system 3 and exchanges heat with the fire water, which is then heated to 80°C.

[0037] After heating, part of the hot water is transported through pipe 6 to the desulfurization tower water inlet 11 and the top of the process water tank 2, where it mixes with the process water and slurry to maintain the slurry temperature in the desulfurization tower 1 at about 35°C (at which temperature the slurry has the best absorption efficiency for SO2).

[0038] The slurry in the process water tank 2 flows into the bottom inlet 12 of the desulfurization tower through the bottom pipe 6, and reacts fully with the flue gas in the tower. The flue gas after SO2 removal is discharged through the top arc pipe 6.

[0039] Temperature detection device 4, pressure sensor, and flow sensor monitor various parameters in real time and transmit them to the host computer. If the parameters are abnormal, the alarm module will be activated immediately. The operator can adjust the electric valve 5 in a timely manner through the host computer to ensure the stable operation of the system.

[0040] The remaining hot water heated by the flue gas waste heat system 3 is supplied to the living area and the factory front area through a separate pipe 6, realizing the comprehensive utilization of energy.

[0041] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the substance and scope of the present invention. Various modifications made by those skilled in the art to the above embodiments after reading this specification are all within the scope of protection of the present invention.

Claims

1. A device for high-efficiency desulfurization of electrolytic aluminum, characterized in that, This includes desulfurization towers, process water tanks, flue gas waste heat systems, temperature detection devices, and electric valves; The flue gas waste heat system includes an inlet and an outlet connected to the water supply port of the desulfurization tower and the top of the process water tank via a pipeline. The outlet is used to supply heated water to the desulfurization tower and the process water tank. The top of the process water tank is connected to the water supply port of the desulfurization tower, and the bottom of the process water tank is connected to the bottom inlet of the desulfurization tower via a pipeline. The temperature detection devices are installed in the process water tank and the desulfurization tower, respectively. The electric valve is located on the pipeline connecting the outlet of the flue gas waste heat system to the desulfurization tower and the process water tank.

2. The device for high-efficiency desulfurization of electrolytic aluminum according to claim 1, characterized in that, The temperature detection device is located 2 meters away from the desulfurization tower and is connected to the host computer.

3. The apparatus for high-efficiency desulfurization of electrolytic aluminum according to claim 1, characterized in that, The temperature detection device has real-time detection and signal transmission functions, which detects the temperature of the slurry in the process water tank and desulfurization tower in real time and transmits the temperature information to the host computer.

4. The apparatus for high-efficiency desulfurization of electrolytic aluminum according to claim 1, characterized in that, The electric valve also includes a pressure sensor and a flow sensor.

5. The apparatus for high-efficiency desulfurization of electrolytic aluminum according to claim 1, characterized in that, The temperature detection device also includes an alarm module, which can issue an alarm when relevant parameters are abnormal.

6. The apparatus for high-efficiency desulfurization of electrolytic aluminum according to claim 1, characterized in that, The top of the desulfurization tower is an arc-shaped pipe, and the pipe outlet faces horizontally.

7. The apparatus for high-efficiency desulfurization of electrolytic aluminum according to claim 1, characterized in that, The pipe has an inner diameter of 300-500mm and is made of S30408 ​​stainless steel.

8. The apparatus for high-efficiency desulfurization of electrolytic aluminum according to claim 1, characterized in that, The outer wall of the pipe is equipped with a 5mm thick rock wool insulation layer, which can control the temperature of the liquid inside the pipe.

9. The apparatus for high-efficiency desulfurization of electrolytic aluminum according to claim 1, characterized in that, The flue gas waste heat system is a heat exchanger that can use the waste heat of flue gas to heat fire water. The heated water is used to heat the slurry and process water in the desulfurization tower and process water tank, and can also be supplied to the living area and the front area of ​​the plant as hot water.

10. The apparatus for high-efficiency desulfurization of electrolytic aluminum according to claim 1, characterized in that, The process water tank is a rectangular parallelepiped-shaped tank.

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