Concentrated sulfuric acid discharging device and sewage treatment system

Abstract

The utility model provides a concentrated sulfuric acid discharging device and a sewage treatment system, and relates to the technical field of industrial sewage treatment, the concentrated sulfuric acid discharging device comprises a tank body, a first pipeline, a fan and a second pipeline, one end of the first pipeline is connected with the tank body, and the fan is arranged at the other end of the first pipeline; the fan is used for blowing air out of the first pipeline to form negative pressure in the first pipeline, the second pipeline is connected with the first pipeline, and the connecting point of the second pipeline and the first pipeline is located between the tank body and the fan. According to the concentrated sulfuric acid discharging device, the fan is additionally arranged on the first pipeline, so that concentrated sulfuric acid liquid in the tank body can be quickly pumped out by utilizing a siphonic effect, the disturbance of the liquid in the tank body is enhanced, and the process of forming acid mud by mutual polymerization of sediments is delayed; meanwhile, the sediment diffuses and moves in the concentrated sulfuric acid liquid and can be discharged from the first pipeline along with the liquid, so that the discharging probability of the sediment is increased, the quantity of the sediment in the tank body is reduced, and the formation of acid mud is inhibited.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial sewage treatment, in particular to a concentrated sulfuric acid discharge device and a sewage treatment system. Background Art

[0002] Sulfuric acid is one of the most active binary inorganic strong acids. It can react with many metals and is an important industrial raw material. It is widely used in purification, smelting, dyeing and other industrial fields.

[0003] In the related art, concentrated sulfuric acid liquid is often stored in liquid storage tanks. Due to the strong corrosive nature of concentrated sulfuric acid, it is easy to produce corrosion products during the production, transportation, and storage processes. The corrosion products eventually accumulate in the form of acid sludge and sink to the bottom of the liquid storage tank. Over time, the acid sludge continues to increase, which not only occupies the effective volume of the liquid storage tank, but also makes it difficult to clean. Utility Model Content

[0004] The technical problem solved by the utility model is that acid mud is easy to be generated and accumulated in the existing concentrated sulfuric acid storage tank.

[0005] To solve the above problems, on the one hand, the utility model provides a concentrated sulfuric acid discharge device, including a tank body, a first pipeline, a fan and a second pipeline: the tank body is used to store concentrated sulfuric acid liquid; one end of the first pipeline is connected to the tank body; the fan is arranged at the other end of the first pipeline, and is used to blow air out of the first pipeline to form a negative pressure in the first pipeline; the second pipeline is connected to the first pipeline, and the connection point between the second pipeline and the first pipeline is located between the tank body and the fan.

[0006] Optionally, the first pipeline is arranged horizontally, and the second pipeline is arranged vertically and the top end is connected to the first pipeline.

[0007] Optionally, the inner diameter of the second pipe is larger than the inner diameter of the first pipe.

[0008] Optionally, the first pipe is connected to the bottom of the side of the tank body.

[0009] Optionally, a baffle is provided in the first pipeline, and the baffle is provided between the connection point of the first pipeline and the second pipeline and the fan, and is used to block the concentrated sulfuric acid liquid.

[0010] Optionally, the baffle is provided with a plurality of air holes, and the plurality of air holes are located in the upper part of the baffle.

[0011] Optionally, the second pipeline is provided with a one-way valve, and the one-way valve is configured to only allow fluid to pass from one end of the second pipeline connected to the first pipeline to the other end.

[0012] Optionally, the first pipeline is provided with a regulating valve, and the regulating valve is arranged between the connection point of the first pipeline and the second pipeline and the tank body, and is used to control the liquid flow in the first pipeline.

[0013] Optionally, the first pipe and the second pipe are both polyethylene pipes.

[0014] On the other hand, the utility model also provides a sewage treatment system, comprising a sewage output device, a mixed liquid treatment device and the concentrated sulfuric acid discharge device described in any one of the above items; the sewage output device comprises a grid member, a sedimentation tank, and a water distribution well arranged in sequence along the sewage output path; the second pipeline of the concentrated sulfuric acid discharge device is connected to the water distribution well, and the water distribution well is used to mix sewage with concentrated sulfuric acid to form a mixed liquid; the mixed liquid treatment device comprises a clarification tank, a filtration tank, and a water storage tank connected in sequence, and the clarification tank is connected to the water distribution well to receive the mixed liquid output from the water distribution well.

[0015] The utility model discloses a concentrated sulfuric acid discharge device and a sewage treatment system. A fan blows air to the outside of a first pipe so as to form a negative pressure in the first pipe. The concentrated sulfuric acid liquid in the tank body is quickly extracted through the first pipe by utilizing the siphon effect. By increasing the flow rate of liquid discharge, the disturbance of the liquid in the tank body can be enhanced under a rapid change in the flow rate, so that the sediment deposited near the bottom of the tank moves irregularly and is lifted up, thereby delaying the process of sediments aggregating to form acid mud. At the same time, the sediments diffuse and move in the concentrated sulfuric acid liquid and can be discharged from the first pipe along with the liquid, thereby increasing the probability of sediment discharge, thereby reducing the amount of sediment in the tank body and inhibiting the formation of acid mud. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of a concentrated sulfuric acid discharge device according to an embodiment of the utility model;

[0017] Figure 2 The utility model is a schematic diagram of the flow of a sewage treatment system according to an embodiment of the present invention.

[0018] Description of reference numerals:

[0019] 10-tank body; 20-first pipeline; 21-baffle; 22-regulating valve; 30-fan; 40-second pipeline; 41-check valve; 100-concentrated sulfuric acid discharge device; 110-grid member; 120-sedimentation tank; 130-water distribution well; 140-clarification tank; 150-filtration tank; 160-water storage tank. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0021] It should be noted that in the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0022] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In the related art, since industrial-grade concentrated sulfuric acid will produce a certain amount of impurities (inorganic salts) during production, transportation, storage, etc., the impurities will settle in the tank after a certain period of standing, forming a certain amount of acid mud at the bottom of the tank. And concentrated sulfuric acid is a viscous liquid. When the concentrated sulfuric acid in the tank is normally discharged through a pipeline, the flow rate of the concentrated sulfuric acid liquid is slow, and its own viscous characteristics will suppress the disturbance of the liquid in the tank. The sediment deposited near the bottom of the tank has only a very small part near the outlet that can be discharged from the pipeline with the concentrated sulfuric acid liquid, and most of the sediments will polymerize to form acid mud. Over time, with the continuous increase of acid mud, the effective liquid storage capacity of the tank is reduced, and the transportation pipeline may be blocked. In addition, the cleaning operation of acid mud is difficult, and there is a certain safety risk in the cleaning process.

[0024] See also Figure 1 In order to solve the above technical problems, on the one hand, an embodiment of the utility model provides a concentrated sulfuric acid discharge device, including a tank body 10, a first pipeline 20, a fan 30 and a second pipeline 40.

[0025] Among them, the tank body 10 is used to store concentrated sulfuric acid liquid, one end of the first pipe 20 is connected to the tank body 10, the fan 30 is arranged at the other end of the first pipe 20, the fan 30 is used to blow air outside the first pipe 20 to form a negative pressure in the first pipe 20, the second pipe 40 is connected to the first pipe 20, and the connection point between the second pipe 40 and the first pipe 20 is located between the tank body 10 and the fan 30.

[0026] The concentrated sulfuric acid discharge device blows air to the outside of the first pipe 20 through the fan 30 so that negative pressure is formed in the first pipe 20, and the concentrated sulfuric acid liquid in the tank body 10 is quickly extracted through the first pipe 20 by using the siphon effect. By increasing the flow rate of liquid discharge, the disturbance of the liquid in the tank body 10 can be enhanced under the rapid change of the flow rate, so that the sediment deposited near the bottom of the tank moves irregularly and is lifted up, thereby delaying the process of sediments aggregating to form acid mud; at the same time, the sediment diffuses and moves in the concentrated sulfuric acid liquid and can be discharged from the first pipe 20 with the liquid, increasing the probability of sediment discharge, thereby reducing the amount of sediment in the tank body 10 and inhibiting the formation of acid mud. In addition, by setting the connection point between the second pipe 40 and the first pipe 20 between the tank body 10 and the fan 30, the liquid in the first pipe 20 can enter the second pipe 40 when it flows to the connection position between the first pipe 20 and the second pipe 40 and be transported to the next process through the second pipe 40.

[0027] Specifically, the tank body 10 can be a hollow cylindrical shape, and each part of the cylindrical tank body 10 is balanced in force and is not easy to deform. The material of the tank body 10 is preferably carbon steel, and the carbon steel tank body 10 has low cost and strong corrosion resistance. The first pipeline 20 and the second pipeline 40 are preferably polyethylene pipes, which have strong corrosion resistance and impact resistance, long service life and low cost. The tank body 10 and the first pipeline 20, and the first pipeline 20 and the second pipeline 40 can be connected by flanges, threaded threads, pipeline connectors, etc., and this embodiment is not limited here.

[0028] In some embodiments, the first pipe 20 is arranged horizontally, and the second pipe 40 is arranged vertically and connected to the first pipe 20 at the top. If the first pipe 20 is arranged upwardly from one end connected to the tank body 10 to the other end, the flow of concentrated sulfuric acid liquid in the first pipe 20 needs to overcome the gravity, which is not conducive to the discharge of the liquid; if the first pipe 20 is arranged downwardly from one end connected to the tank body 10 to the other end, part of the liquid in the first pipe 20 is easy to flow to the position of the fan 30 over the top pipe mouth of the second pipe 40 under the action of gravity, thereby polluting the fan 30 or directly discharged to the outside from the end of the first pipe 20 provided with the fan 30. To avoid the above situation, it is best to arrange the first pipe 20 horizontally. The second pipe 40 is arranged vertically, so that when the liquid in the first pipe 20 flows to the connection between the first pipe 20 and the second pipe 40, the liquid can flow directly into the second pipe 40 under the action of gravity, and will not continue to flow to the end of the first pipe 20 provided with the fan 30, which is conducive to the rapid discharge of concentrated sulfuric acid liquid from the second pipe 40.

[0029] Of course, in other embodiments, depending on the actual discharge position requirement of the concentrated sulfuric acid liquid, the second pipe 40 can also be inclined at other non-vertical angles, the top end of the second pipe 40 is connected to the first pipe 20, and the bottom end of the second pipe 40 extends to the target discharge position, so that the second pipe 40 can be set in an inclined state, and it is only necessary to ensure that the concentrated sulfuric acid liquid enters the second pipe 40 when it flows to the connection position between the first pipe 20 and the second pipe 40.

[0030] Optionally, the inner diameter of the second pipe 40 is larger than the inner diameter of the first pipe 20. In this way, the second pipe 40 can fully receive and guide the concentrated sulfuric acid liquid in the first pipe 20, so as to avoid the liquid in the first pipe 20 exceeding the upper limit of the discharge of the second pipe 40, causing part of the liquid in the first pipe 20 to flow over the pipe mouth of the second pipe 40 to the end of the first pipe 20 provided with the fan 30.

[0031] Furthermore, the first pipe 20 is connected to the bottom of the side of the tank body 10. In this way, it is beneficial to disturb the sediment at the bottom of the tank during the liquid discharge process, further inhibit the formation of acid sludge, and increase the probability of sediment discharge.

[0032] In some embodiments, a baffle 21 is provided in the first pipe 20, and the baffle 21 is provided between the connection point of the first pipe 20 and the second pipe 40 and the fan 30, and is used to block the concentrated sulfuric acid liquid. When the wind force of the fan 30 is large and the pressure in the first pipe 20 is low, the flow rate of the concentrated sulfuric acid liquid is fast, and the concentrated sulfuric acid liquid may flow over the nozzle of the second pipe 40 to the end of the first pipe 20 where the fan 30 is provided. By providing the baffle 21, the concentrated sulfuric acid liquid can be blocked to prevent the liquid from contaminating the fan 30 or flowing out from the end of the first pipe 20 where the fan 30 is provided.

[0033] More specifically, in order not to hinder the flow of gas and to form a certain degree of obstruction to the concentrated sulfuric acid liquid, a plurality of pores are provided on the baffle 21, and the plurality of pores are located in the upper half of the baffle 21. The baffle 21 can be a circular plate-shaped structure whose size matches the inner diameter of the first pipe 20, and the baffle 21 can be fixed in the first pipe 20 by bolt connection, welding, etc. The upper half of the baffle 21 is provided with pores for the airflow generated by the operation of the fan 30 to pass through, so that negative pressure is smoothly formed in the first pipe 20; the lower half of the baffle 21 is not provided with pores, which can form a barrier to the concentrated sulfuric acid liquid. Further, the number of pores is large and the pore diameter is small. Even if the concentrated sulfuric acid liquid accumulates to the height position of the pores on one side of the baffle 21, the pores with a smaller pore diameter can form a certain barrier to the viscous concentrated sulfuric acid liquid, thereby further improving the barrier effect on the concentrated sulfuric acid liquid without affecting the gas circulation.

[0034] In some embodiments, the second pipe 40 is provided with a one-way valve 41, and the one-way valve 41 is configured to only allow the fluid to pass from one end of the second pipe 40 connected to the first pipe 20 to the other end. In the illustrated embodiment, the one-way valve 41 only allows the fluid to pass from top to bottom, and does not allow the fluid to pass from bottom to top. In this way, when the fan 30 is working, the one-way valve 41 can block the gas entering the bottom end of the second pipe 40, and the external gas will not enter the first pipe 20 through the second pipe 40, which is conducive to forming a negative pressure environment in the first pipe 20 faster and easier; when the concentrated sulfuric acid liquid flows from top to bottom in the second pipe 40 through the one-way valve 41, the one-way valve 41 will not hinder the flow of the liquid, and the liquid can be discharged by itself under the action of gravity. The one-way valve 41 is preferably a spring one-way valve 41, which is easy to install and has a long service life.

[0035] Optionally, the first pipeline 20 is provided with a regulating valve 22, which is disposed between the connection point of the first pipeline 20 and the second pipeline 40 and the tank body 10. By adjusting the regulating valve 22, the liquid flow in the first pipeline 20 can be controlled, thereby controlling the unit flow of the concentrated sulfuric acid liquid discharged.

[0036] On the other hand, see Figure 2 The embodiment of the utility model also provides a sewage treatment system, including a sewage output device, a mixed liquid treatment device and the concentrated sulfuric acid discharge device 100 of the above embodiment; the sewage output device includes a grid member 110, a sedimentation tank 120, and a water distribution well 130 arranged in sequence along the sewage output path; the second pipeline 40 of the concentrated sulfuric acid discharge device 100 is connected to the water distribution well 130, and the water distribution well 130 is used to mix sewage with concentrated sulfuric acid to form a mixed liquid; the mixed liquid treatment device includes a clarification tank 140, a filtering tank 150, and a water storage tank 160 connected in sequence, and the clarification tank 140 is connected to the water distribution well 130 to receive the mixed liquid output from the water distribution well 130.

[0037] The sewage treatment process is as follows: industrial sewage enters the sewage output device, and flows into the sedimentation tank 120 after filtering through the grid member 110 to remove large floating particles and impurities. After the sedimentation tank 120 removes the sand, scum and floating oil, it flows into the water distribution well 130; according to the amount of sewage, the concentrated sulfuric acid discharge device 100 is operated to add an appropriate amount of concentrated sulfuric acid liquid to the water distribution well 130, and the liquid flows into the water distribution well 130 from the bottom end of the second pipeline 40. At the same time, an appropriate amount of coagulant is added to the water distribution well 130. After the sewage reacts with the coagulant and concentrated sulfuric acid to form a mixed liquid, it is transported to the mixed liquid treatment device; the mixed liquid sewage enters the filter tank 150 after sedimentation and separation in the clarification tank 140, and flows into the water storage tank 160 for temporary storage after filtering in the filter tank 150, and the sewage treatment is completed. The treated water can be sent to the production fire protection pipe network as production supplementary water for reuse after being disinfected with sodium hypochlorite, reducing environmental pollution and improving the utilization rate of water resources. Since the sewage treatment system adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0038] In summary, the concentrated sulfuric acid discharge device and sewage treatment system of the utility model can utilize the siphon effect to quickly extract the concentrated sulfuric acid liquid in the tank body 10 by adding a fan 30 to the first pipe 20, enhance the disturbance of the liquid in the tank body 10, and delay the process of sediments aggregating to form acid sludge; at the same time, the sediments diffuse and move in the concentrated sulfuric acid liquid and can be discharged from the first pipe 20 with the liquid, which increases the probability of sediment discharge, thereby reducing the amount of sediment in the tank body 10 and inhibiting the formation of acid sludge. Compared with the prior art, the acid sludge in the tank body 10 of the concentrated sulfuric acid discharge device is not easy to form and the sediment is easy to be extracted with the liquid, which can effectively increase the effective volume of the tank body 10, reduce the difficulty of cleaning the acid sludge, and has good practical value.

[0039] Although the utility model is disclosed as above, the protection scope of the utility model is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will fall within the protection scope of the utility model.

Claims

1. A concentrated sulfuric acid discharge device, characterized in that: include: A tank (10) for storing concentrated sulfuric acid liquid; A first pipe (20), one end of which is connected to the tank body (10); a fan (30), arranged at the other end of the first pipe (20), and used for blowing air out of the first pipe (20) to form a negative pressure in the first pipe (20); A second pipeline (40) is connected to the first pipeline (20), and a connection point between the second pipeline (40) and the first pipeline (20) is located between the tank body (10) and the fan (30).

2. The concentrated sulfuric acid discharge device according to claim 1, characterized in that: The first pipeline (20) is arranged horizontally, and the second pipeline (40) is arranged vertically and the top end is connected to the first pipeline (20).

3. The concentrated sulfuric acid discharge device according to claim 2, characterized in that: The inner diameter of the second pipe (40) is greater than the inner diameter of the first pipe (20).

4. The concentrated sulfuric acid discharge device according to claim 2, characterized in that: The first pipe (20) is connected to the bottom of the side of the tank body (10).

5. The concentrated sulfuric acid discharge device according to claim 1, characterized in that: A baffle (21) is provided in the first pipeline (20), and the baffle (21) is provided between the connection point of the first pipeline (20) and the second pipeline (40) and the fan (30), and is used to block the concentrated sulfuric acid liquid.

6. The concentrated sulfuric acid discharge device according to claim 5, characterized in that: The baffle plate (21) is provided with a plurality of air holes, and the plurality of air holes are located in the upper part of the baffle plate (21).

7. The concentrated sulfuric acid discharge device according to claim 1, characterized in that: The second pipeline (40) is provided with a one-way valve (41), and the one-way valve (41) is configured to only allow fluid to pass from one end of the second pipeline (40) connected to the first pipeline (20) to the other end.

8. The concentrated sulfuric acid discharge device according to claim 1, characterized in that: The first pipeline (20) is provided with a regulating valve (22), and the regulating valve (22) is arranged between the connection point of the first pipeline (20) and the second pipeline (40) and the tank body (10), and is used to control the liquid flow in the first pipeline (20).

9. The concentrated sulfuric acid discharge device according to claim 1, characterized in that: The first pipe (20) and the second pipe (40) are both polyethylene pipes.

10. A sewage treatment system, characterized in that: The invention comprises a sewage output device, a mixed liquid treatment device and the concentrated sulfuric acid discharge device according to any one of claims 1 to 9; the sewage output device comprises a grid member (110), a sedimentation tank (120) and a water distribution well (130) which are sequentially arranged along the sewage output path; a second pipe (40) of the concentrated sulfuric acid discharge device is connected to the water distribution well (130), and the water distribution well (130) is used to mix sewage with concentrated sulfuric acid to form a mixed liquid; the mixed liquid treatment device comprises a clarification tank (140), a filtration tank (150) and a water storage tank (160) which are sequentially connected, and the clarification tank (140) is connected to the water distribution well (130) to receive the mixed liquid output from the water distribution well (130).

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