Pressure relief device for mother liquor concentration tank

Abstract

The utility model relates to the technical field of high-purity aluminum oxide production, in particular to a mother liquor concentration tank pressure relief device which comprises a pressure relief pipe, a pressure relief opening is formed in one side of the pressure relief pipe, a monitoring pipe is fixedly installed in the pressure relief opening, an agent box is fixedly installed on the surface of the monitoring pipe, a heat exchange assembly is fixedly installed at one end of the monitoring pipe, and the heat exchange assembly is fixedly installed at the other end of the monitoring pipe. The heat exchange assembly is arranged in the medicament box, and a purification assembly is fixedly installed on one side of the medicament box. According to the device disclosed by the utility model, dilute sulfuric acid is conveyed into the spraying pipe through the medicament pipe by the water pump, so that the heated dilute sulfuric acid is sprayed into the purification box through the spraying pipe, and gas subjected to heat exchange and cooling is conveyed to the gas spray head through the extension pipe and is sprayed into the purification box to be sprayed and neutralized with a sprayed dilute sulfuric acid solution; the ammonia gas in the gas is neutralized to generate a harmless ammonium salt solution, and the ammonium salt solution is discharged through a guide hopper and a flow guide pipe at the bottom of the purification box, so that the ammonia gas contained in the gas is purified, and the atmosphere is prevented from being polluted.

Description

Technical Field

[0001] This utility model relates to the field of high-purity alumina production technology, specifically a mother liquor concentration tank pressure relief device. Background Technology

[0002] In the production of high-purity alumina, the main function of the mother liquor concentration tank is to evaporate and concentrate the mother liquor during the production process, thereby recovering useful components or further processing. During evaporation, steam is generated, and the pressure inside the tank rises. In order to maintain the pressure inside the tank at a constant level within a safe range, the mother liquor concentration tank needs to be depressurized in real time during operation. This requires the use of a pressure relief device.

[0003] In existing technology, when depressurizing a mother liquor concentrate tank, a pressure relief valve is usually installed at the pressure relief port of the mother liquor concentrate tank. The valve releases steam from the tank, thereby maintaining a constant pressure. Utility model patent CN220257188U discloses a pressure relief device for a concentrate tank, including a vacuum pump, a condenser, and a pressure detection device for detecting the pressure inside the concentrate tank. The steam outlet of the concentrate tank, the condenser, and the vacuum pump are connected sequentially, and a connection is established between the condenser and the steam outlet of the concentrate tank. The device includes a buffer tank, in which the pressure detection element is located. It also includes a heat recovery unit comprising a storage tank, heat exchange tubes, and a water pump. The heat exchange tubes are located inside the buffer tank, and the water pump is used to extract the stored liquid from the storage tank. Because the pressure detection element is located inside the buffer tank, even if the solution in the concentration tank boils violently, the splashing solution will not come into contact with the pressure detection element, thus preventing contamination and eliminating the need for frequent cleaning. Furthermore, the heat recovery unit can recover some of the steam heat before the steam enters the condenser.

[0004] However, this pressure relief method still has some problems. While the heat recovery unit recovers some of the steam heat before it enters the condenser, in actual evaporation and concentration of high-purity alumina mother liquor in the concentration tank, in order to ensure the sufficiency of recovered materials, ammonia water additives need to be added to the recovered liquid to adjust the pH value or promote precipitation to help with recovery. During the evaporation process, the ammonia water additives will generate ammonia gas, and if the ammonia gas is directly released into the atmosphere, it will pollute the environment. This device only recovers the steam heat without treating the harmful gases in the steam, resulting in an environmentally unfriendly pressure relief problem. Utility Model Content

[0005] The purpose of this invention is to provide a pressure relief device for a mother liquor concentration tank to solve the problems mentioned in the background art.

[0006] The technical solution of this utility model is: a mother liquor concentration tank pressure relief device, including a pressure relief pipe, a pressure relief port is opened on one side of the pressure relief pipe, a monitoring pipe is fixedly installed in the pressure relief port, a reagent tank is fixedly installed on the surface of the monitoring pipe, a heat exchange component is fixedly installed at one end of the monitoring pipe, the heat exchange component is set in the reagent tank, and a purification component is fixedly installed on one side of the reagent tank.

[0007] The purification assembly includes a purification box, which is fixedly installed on one side of a reagent tank. A connection port is provided on one side of the purification box, and a connecting port is provided on the other side of the reagent tank. An extension pipe is fixedly installed inside the connecting port, passing through both the connecting port and the connection port. A gas nozzle is fixedly installed at one end of the extension pipe, which is located at the bottom of the purification box. The other end of the extension pipe is connected to a heat exchange assembly. A mounting hole is provided on the upper side of the purification box, and a spray pipe is fixedly installed inside the mounting hole. A liquid supply unit is fixedly installed on the upper side of the reagent tank, and the liquid supply unit is connected to the spray pipe.

[0008] Preferably, the liquid supply unit includes a water pump, which is fixedly installed on the top of the medicine tank. A medicine pipe is fixedly installed at the outlet of the water pump, and the other end of the medicine pipe is fixedly connected to the top of the spray pipe. A delivery port is opened on the upper side of the medicine tank, and a suction pipe is fixedly installed in the delivery port. The top of the suction pipe is fixedly connected to the inlet of the water pump.

[0009] Preferably, the heat exchange assembly includes a heat exchange tube, which is fixedly installed at one end of the monitoring tube, and the other end of the heat exchange tube is fixedly connected to one end of the extension tube. Two condensation holes are opened on the lower side of the heat exchange tube, and condenser tubes are fixedly installed in the two condensation holes. An external connection hole is opened on the lower side of the reagent tank, and a cold water pipe is fixedly installed in the external connection hole. The cold water pipe is connected to the lower part of the condenser tube, and an electronic valve is fixedly installed on the surface of the cold water pipe.

[0010] Preferably, a drive hole is provided on the upper side of the medicine box, a stirring rod is rotatably installed in the drive hole, a stirring motor is fixedly installed on the upper side of the medicine box, and the output shaft of the stirring motor is coaxially and fixedly connected to the top end of the stirring rod.

[0011] Preferably, a piston is slidably installed on the inner wall of the pressure relief pipe, a spring is fixedly installed on the upper side of the piston, the other end of the spring is fixedly installed on the inner top wall of the pressure relief pipe, a monitoring hole is opened on the surface of the monitoring pipe, and a pressure sensor is fixedly installed in the monitoring hole.

[0012] Preferably, a guide bucket is fixedly installed on the lower side of the purification box, and a guide pipe is fixedly installed at the bottom end of the guide bucket.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. In this utility model, a water pump delivers dilute sulfuric acid through a suction pipe to a spray pipe via a reagent pipe. The heated dilute sulfuric acid is then sprayed into the purification chamber through the spray pipe. At this time, the gas, after heat exchange and cooling, is delivered to the gas nozzle through an extension pipe and sprayed into the purification chamber. It is then sprayed and neutralized with the sprayed dilute sulfuric acid solution, neutralizing the ammonia in the gas to form a harmless ammonium salt solution. This solution is then discharged through a guide bucket and a guide pipe at the bottom of the purification chamber, thus purifying the ammonia in the gas, preventing atmospheric pollution, and improving the environmental friendliness of the device.

[0015] 2. In this invention, a heat exchange tube can heat the dilute sulfuric acid solution and lower the gas temperature, thus raising the temperature of the dilute sulfuric acid solution. A water pump then pumps the dilute sulfuric acid through a suction pipe and a reagent pipe to a spray pipe, allowing the heated dilute sulfuric acid to be sprayed into the purification chamber. At the same time, the gas, cooled by heat exchange, is transported through an extension pipe to a gas nozzle and sprayed into the purification chamber, where it is sprayed and neutralized with the sprayed dilute sulfuric acid solution. This process cools the gas and prevents the dilute sulfuric acid from evaporating due to excessive heat. In addition, heating the dilute sulfuric acid promotes the neutralization rate and enhances the neutralization reaction effect. Attached Figure Description

[0016] The present invention will be further explained below with reference to the accompanying drawings and embodiments:

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the overall cross-sectional structure of this utility model;

[0019] Figure 3 This is a partial structural schematic diagram of the present invention. Figure 1 ;

[0020] Figure 4 This is a partial structural schematic diagram of the present invention. Figure 2 .

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Pressure relief pipe; 2. Chemical tank; 3. Purification tank; 4. Monitoring pipe; 5. Heat exchanger pipe; 6. Condenser pipe; 7. Cold water pipe; 8. Electronic valve; 9. Guide pipe; 10. Guide hopper; 11. Chemical pipe; 12. Water pump; 13. Suction pipe; 14. Stirring motor; 15. Stirring rod; 16. Extension pipe; 17. Gas nozzle; 18. Pressure sensor; 19. Spring; 20. Piston; 21. Spray pipe. Detailed Implementation

[0023] The present invention will be further described below with reference to specific embodiments. However, those skilled in the art should understand that the detailed description given here with reference to the accompanying drawings is for better explanation. The structure of the present invention may exceed the limited embodiments described herein. Some equivalent alternatives or common means will not be described in detail here, but they still fall within the protection scope of this application.

[0024] Figures 1-4 This is the preferred embodiment of the present invention, which is described below in conjunction with the appendix. Figure 1 ~Appendix Figure 4 The present invention will be further described below.

[0025] like Figures 1-4 As shown, a mother liquor concentration tank pressure relief device includes a pressure relief pipe 1, a pressure relief port on one side of the pressure relief pipe 1, a monitoring pipe 4 fixedly installed inside the pressure relief port, the monitoring pipe 4 being connected to the pressure relief pipe 1, a reagent tank 2 fixedly installed on the surface of the monitoring pipe 4, a heat exchange component fixedly installed at one end of the monitoring pipe 4, the heat exchange component being disposed inside the reagent tank 2, a purification component fixedly installed on one side of the reagent tank 2, and a dilute sulfuric acid solution or other acidic solution being disposed inside the reagent tank 2.

[0026] The purification assembly includes a purification box 3, which is fixedly installed on one side of a reagent tank 2. A connection port is provided on one side of the purification box 3, and a connecting port is provided on one side of the reagent tank 2. An extension pipe 16 is fixedly installed inside the connecting port, passing through both the connecting port and the connecting port. A gas nozzle 17 is fixedly installed at one end of the extension pipe 16, located at the bottom of the purification box 3. The gas nozzle 17 is a capped nozzle from existing technology, or a similar nozzle structure from existing technology that prevents liquid backflow. The other end of the extension pipe 16 is connected to a heat exchange assembly. A mounting hole is provided on the upper side of the purification box 3, and a spray pipe 21 is fixedly installed inside the mounting hole. A liquid supply unit is fixedly installed on the upper side of the reagent tank 2, connected to the spray pipe 21. The spray pipe 21 can spray dilute sulfuric acid or other acidic solutions.

[0027] With the above structure, the upper side of the reagent tank 2 is provided with a liquid injection port for injecting dilute sulfuric acid. The gas containing ammonia enters the purification tank 3 through the heat exchange component. The connection port is connected to the communication port. The gas nozzle 17 is connected to the heat exchange component through the extension pipe 16 and the gas is sprayed out through the gas nozzle 17. At this time, the liquid supply unit sprays dilute sulfuric acid through the spray pipe 21 to form an atomized umbrella-shaped water curtain, which neutralizes the gas containing ammonia to generate a harmless ammonium salt solution, thus completing the purification.

[0028] Furthermore, the liquid supply unit includes a water pump 12, which is fixedly installed on the top of the medicine tank 2. A medicine pipe 11 is fixedly installed at the outlet end of the water pump 12, and the other end of the medicine pipe 11 is fixedly connected to the top end of the spray pipe 21. A delivery port is opened on the upper side of the medicine tank 2, and a suction pipe 13 is fixedly installed inside the delivery port. The top end of the suction pipe 13 is fixedly connected to the inlet end of the water pump 12.

[0029] With the above structure, the bottom of the inhalation tube 13 is located at the bottom of the medicine tank 2, which makes it easy to draw out the dilute sulfuric acid in the medicine tank 2.

[0030] Furthermore, the heat exchange assembly includes a heat exchange tube 5, which is fixedly installed at one end of the monitoring tube 4. The other end of the heat exchange tube 5 is fixedly connected to one end of the extension tube 16. Two condensation holes are opened on the lower side of the heat exchange tube 5, and a condenser tube 6 is fixedly installed in the two condensation holes. An external connection hole is opened on the lower side of the reagent tank 2, and a cold water pipe 7 is fixedly installed in the external connection hole. The cold water pipe 7 is connected to the lower part of the condenser tube 6, and the two are connected. An electronic valve 8 is fixedly installed on the surface of the cold water pipe 7.

[0031] With the above structure, the diameter of the heat exchange tube 5 is smaller than that of the monitoring tube 4, and multiple S-shaped bends are provided to facilitate sufficient heat exchange of the dilute sulfuric acid in the reagent tank 2. The condenser tube 6 is installed at the lowest point of the heat exchange tube 5. When the heat exchange tube 5 is exchanging heat, water droplets will be generated due to the heating and cooling effect. The water droplets will remain at the lowest point of the heat exchange tube 5 and can be collected through the condenser tube 6. The cold water pipe 7 below the condenser tube 6 is made of transparent glass, so it is possible to observe whether there is water inside. If water accumulates, the liquid water can be discharged by opening the electronic valve 8 to prevent condensate from remaining in the heat exchange tube 5.

[0032] Furthermore, a drive hole is provided on the upper side of the medicine tank 2, and a stirring rod 15 is rotatably installed in the drive hole. A stirring motor 14 is fixedly installed on the upper side of the medicine tank 2, and the output shaft of the stirring motor 14 is coaxially and fixedly connected to the top end of the stirring rod 15.

[0033] With the above structure, the stirring rod 15 can stir the medicine and make it heat evenly.

[0034] Furthermore, a piston 20 is slidably installed on the inner wall of the pressure relief pipe 1, a spring 19 is fixedly installed on the upper side of the piston 20, and the other end of the spring 19 is fixedly installed on the inner top wall of the pressure relief pipe 1. A monitoring hole is opened on the surface of the monitoring pipe 4, and a pressure sensor 18 is fixedly installed in the monitoring hole.

[0035] With the above structure, the pressure sensor 18 is a prior art technology that can monitor the pressure inside the monitoring tube 4, making it convenient to monitor the pressure inside the mother liquor concentration tank.

[0036] Furthermore, a guide bucket 10 is fixedly installed on the lower side of the purification box 3, and a guide pipe 9 is fixedly installed at the bottom end of the guide bucket 10.

[0037] With the above structure, the formed ammonium salt solution can be easily discharged through the guide tube 9 via the guide bucket 10.

[0038] Working Principle: When using the device, first, sufficient dilute sulfuric acid solution for neutralizing ammonia is injected into the reagent tank 2. Then, the pressure relief pipe 1 is connected to the release port of the mother liquor concentration tank. When the mother liquor concentration tank evaporates and generates pressure, causing the internal gas to be discharged through the release port, pressure is first applied to the piston 20. As the pressure gradually increases, it pushes the piston 20 upward and compresses the spring 19. When the piston 20 is higher than the pressure relief port, the gas in the mother liquor concentration tank enters the monitoring pipe 4, which monitors the current gas pressure. Next, the gas enters the heat exchange pipe 5, which heats the dilute sulfuric acid solution and lowers the gas temperature, thus raising the temperature of the dilute sulfuric acid solution and promoting the subsequent neutralization reaction. At this time, the stirring motor 14 and water pump 12 are started. The output of the stirring motor 14 drives the stirring rod 15 to rotate, thus stimulating the dilute sulfuric acid solution... Stirring ensures even heating. Water pump 12 delivers dilute sulfuric acid through suction pipe 13 and agent pipe 11 to spray pipe 21, allowing the heated dilute sulfuric acid to be sprayed into purification tank 3. At this time, the gas cooled by heat exchange is delivered through extension pipe 16 to gas nozzle 17 and sprayed into purification tank 3, where it is sprayed and neutralized with the sprayed dilute sulfuric acid solution. This neutralizes the ammonia in the gas, generating a harmless ammonium salt solution, which is then discharged through guide bucket 10 and guide pipe 9 at the bottom of purification tank 3. A collection dish is placed below guide pipe 9 to collect the waste liquid. During heat exchange, it is also possible to observe whether there is condensed water in cold water pipe 7. If water is found, the electronic valve 8 can be opened in time to discharge the water in condenser pipe 6 through cold water pipe 7, preventing water from accumulating in heat exchange pipe 5.

[0039] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A pressure relief device for a mother liquor concentration tank, comprising a pressure relief pipe (1), characterized in that: A pressure relief port is provided on one side of the pressure relief pipe (1), a monitoring pipe (4) is fixedly installed inside the pressure relief port, a medicine box (2) is fixedly installed on the surface of the monitoring pipe (4), a heat exchange component is fixedly installed at one end of the monitoring pipe (4), the heat exchange component is set inside the medicine box (2), and a purification component is fixedly installed on one side of the medicine box (2). The purification assembly includes a purification box (3), which is fixedly installed on one side of the reagent box (2). A connection port is provided on one side of the purification box (3), and a communication port is provided on one side of the reagent box (2). An extension pipe (16) is fixedly installed in the communication port. The extension pipe (16) passes through the communication port and the connection port in sequence. A gas nozzle (17) is fixedly installed at one end of the extension pipe (16). The gas nozzle (17) is located at the bottom of the purification box (3). The other end of the extension pipe (16) is connected to a heat exchange assembly. An installation hole is provided on the upper side of the purification box (3). A spray pipe (21) is fixedly installed in the installation hole. A liquid supply unit is fixedly installed on the upper side of the reagent box (2). The liquid supply unit is connected to the spray pipe (21).

2. The pressure relief device for a mother liquor concentration tank according to claim 1, characterized in that: The liquid supply unit includes a water pump (12), which is fixedly installed on the top of the medicine tank (2). A medicine pipe (11) is fixedly installed at the outlet end of the water pump (12). The other end of the medicine pipe (11) is fixedly connected to the top end of the spray pipe (21). A delivery port is opened on the upper side of the medicine tank (2). A suction pipe (13) is fixedly installed in the delivery port. The top end of the suction pipe (13) is fixedly connected to the inlet end of the water pump (12).

3. The pressure relief device for a mother liquor concentration tank according to claim 1, characterized in that: The heat exchange assembly includes a heat exchange tube (5), which is fixedly installed at one end of the monitoring tube (4). The other end of the heat exchange tube (5) is fixedly connected to one end of the extension tube (16). Two condensation holes are opened on the lower side of the heat exchange tube (5), and a condenser tube (6) is fixedly installed in the two condensation holes. An external connection hole is opened on the lower side of the reagent tank (2), and a cold water pipe (7) is fixedly installed in the external connection hole. The cold water pipe (7) is connected to the lower part of the condenser tube (6), and an electronic valve (8) is fixedly installed on the surface of the cold water pipe (7).

4. The pressure relief device for a mother liquor concentration tank according to claim 1, characterized in that: The medicine box (2) has a drive hole on its upper side, and a stirring rod (15) is rotatably installed in the drive hole. A stirring motor (14) is fixedly installed on the upper side of the medicine box (2), and the output shaft of the stirring motor (14) is coaxially and fixedly connected to the top end of the stirring rod (15).

5. The pressure relief device for a mother liquor concentration tank according to claim 1, characterized in that: A piston (20) is slidably installed on the inner wall of the pressure relief pipe (1). A spring (19) is fixedly installed on the upper side of the piston (20). The other end of the spring (19) is fixedly installed on the inner top wall of the pressure relief pipe (1). A monitoring hole is opened on the surface of the monitoring pipe (4). A pressure sensor (18) is fixedly installed in the monitoring hole.

6. The pressure relief device for a mother liquor concentration tank according to claim 1, characterized in that: A guide bucket (10) is fixedly installed on the lower side of the purification box (3), and a guide pipe (9) is fixedly installed at the bottom end of the guide bucket (10).

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