A waste heat recovery device for a phosphoric acid concentration process

Abstract

This utility model discloses a waste heat recovery device for phosphoric acid concentration process, comprising: a stirring chamber, a feed pipe provided on the top left side of the stirring chamber, a cover plate provided on the top of the feed pipe, a support frame provided at the bottom of the stirring chamber, a guide hopper provided inside the stirring chamber, and a guide pipe provided at the bottom of the guide hopper. This utility model, by incorporating a stirring assembly, can stir the materials inside the stirring chamber. Simultaneously, an electric heating plate can preheat the phosphoric acid. During the preheating and filtration process, solid impurities and insoluble particles in the phosphoric acid can be removed. A filter plate can perform preliminary filtration of the phosphoric acid, removing undissolved impurities and improving the subsequent concentration quality of the phosphoric acid. With the cooperation of a condensation assembly, steam heat energy can be recovered, saving resources. Furthermore, during the phosphoric acid manufacturing process, a purification assembly can purify the waste gas generated during manufacturing, and the purification assembly can be easily cleaned.

Description

Technical Field

[0001] This utility model relates to the field of phosphoric acid preparation, and in particular to a waste heat recovery device for phosphoric acid concentration process. Background Technology

[0002] Phosphoric acid, or orthophosphoric acid, with the chemical formula H3PO4 and a molecular weight of 97.9724, is a common inorganic acid. It is a moderately strong acid and can be obtained by dissolving phosphorus decaoxide in hot water. In the industrial process, orthophosphoric acid is obtained by treating apatite with sulfuric acid. Phosphoric acid is hygroscopic in air and loses water upon heating to obtain pyrophosphoric acid. Further water loss yields metaphosphoric acid. Phosphoric acid is mainly used in the pharmaceutical, food, and fertilizer industries, and can also be used as a chemical reagent.

[0003] Traditional phosphoric acid concentration equipment is prone to heat loss during the phosphoric acid concentration process; at the same time, the waste gas generated during the phosphoric acid production process is directly emitted without effective treatment, which not only pollutes the environment, but may also pose a threat to the health of operators. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a waste heat recovery device for the phosphoric acid concentration process.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] This utility model discloses a waste heat recovery device for a phosphoric acid concentration process, comprising:

[0007] The mixing chamber has a feed pipe on its top left side, a cover plate on top of the feed pipe, a support frame at the bottom, a guide hopper inside, a guide pipe at the bottom of the guide hopper, a solenoid valve at the connection between the guide pipe and the guide hopper, a conveying pipe at the bottom of the mixing chamber (L-shaped), a mixing assembly inside, an electric heating plate on the inner wall of the mixing chamber (annular structure with the same inner diameter as the mixing chamber), a filter plate movably mounted inside the mixing chamber at the bottom of the guide hopper, and a controller outside the mixing chamber.

[0008] A concentration assembly is disposed on the right side of the mixing chamber;

[0009] A condensation assembly is disposed on top of the concentration assembly;

[0010] A purification component is disposed on the top right side of the mixing chamber.

[0011] As a preferred embodiment of this utility model, the concentration assembly includes a support plate, a concentration tank, an electric heating tube, and a discharge pipe. The support plate is located on the right side of the mixing chamber, the concentration tank is located on the top of the support plate, the electric heating tube is located inside the concentration tank, the discharge pipe is located at the bottom right side of the concentration tank, and a valve is provided at the connection between the discharge pipe and the concentration tank.

[0012] As a preferred embodiment of this utility model, the condensation assembly includes a conduit, a condenser pipe, a condensation box, and a cooler. The condensation box is located at the top of the concentration tank. A condenser pipe is installed inside the condensation box. The condenser pipe is connected to the conduit via a connecting rod. The other end of the condenser pipe extends to the outside of the condensation box. A valve is installed at the connection between the condenser pipe and the condensation box. The conduit has an inverted U-shaped structure. Both ends of the bottom of the conduit are connected to the top of the concentration tank. A cooler is installed on the outside of the condensation box.

[0013] As a preferred embodiment of this utility model, the stirring assembly includes a motor, a rotating rod, a stirring rod, and a scraper. The motor is located at the top of the stirring chamber, and the rotating rod is mounted on the rotating shaft of the motor, extending into the interior of the stirring chamber.

[0014] As a preferred embodiment of this utility model, three stirring rods are installed on both sides of the rotating rod, and scrapers are fixedly installed on the outer side of each stirring rod, with the outer wall of each scraper in contact with the inner wall of the electric heating plate.

[0015] As a preferred technical solution of this utility model, the purification component includes a purification chamber, a filter screen, an activated carbon plate, a connecting plate, a slider, and an exhaust pipe. The purification chamber is located on the top right side of the mixing chamber, and the purification chamber and the mixing chamber are connected by a connecting pipe. The filter screen and the activated carbon plate are provided with connecting plates on both sides. The connecting plates are slidably connected to the purification chamber. A sealing plate is provided on the outside of the connecting plate, and a handle is provided on the outside of the sealing plate.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This invention features a stirring assembly that agitates the materials inside the mixing chamber. Simultaneously, an electric heating plate preheats the phosphoric acid. During preheating and filtration, solid impurities and insoluble particles are removed from the phosphoric acid. A filter plate performs preliminary filtration, removing undissolved impurities and improving the subsequent concentration quality. The condenser assembly enables the recovery of steam heat energy, saving resources. Furthermore, a purification assembly purifies the waste gas generated during phosphoric acid manufacturing, and the purification assembly itself can be easily cleaned. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a front view of the present invention;

[0020] Figure 2 This is a front sectional view of the present invention;

[0021] Figure 3 This is the utility model Figure 2 Enlarged view of the structure at point A in the middle;

[0022] In the diagram: 1. Mixing chamber; 2. Feed hopper; 3. Feed pipe; 4. Conveying pipe; 5. Electric heating plate; 6. Filter plate; 7. Support plate; 8. Concentrator; 9. Electric heating tube; 10. Discharge pipe; 11. Guide pipe; 12. Condenser pipe; 13. Condenser box; 14. Air cooler; 15. Motor; 16. Rotating rod; 17. Mixing rod; 18. Scraper; 19. Purification chamber; 20. Filter screen; 21. Activated carbon plate; 22. Connecting plate. Detailed Implementation

[0023] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0024] In the attached diagram, all identical reference numerals refer to the same components.

[0025] like Figure 1-3 As shown, this utility model provides a waste heat recovery device for a phosphoric acid concentration process, comprising:

[0026] The mixing chamber 1 has a feed pipe on the top left side, a cover plate on the top of the feed pipe, a support frame at the bottom, a guide hopper 2 inside the mixing chamber 1, a guide pipe 3 at the bottom of the guide hopper 2, a solenoid valve at the connection between the guide pipe 3 and the guide hopper 2, a conveying pipe 4 at the bottom of the mixing chamber 1 with an L-shaped structure, a mixing assembly inside the mixing chamber 1, an electric heating plate 5 on the inner wall of the mixing chamber 1 with an annular structure and an inner diameter the same as the inner diameter of the mixing chamber 1, a filter plate 6 movable inside the mixing chamber 1 at the bottom of the guide hopper 2, and a controller outside the mixing chamber 1.

[0027] The concentration component is located on the right side of the mixing chamber 1;

[0028] A condenser assembly is located on top of the concentration assembly;

[0029] The purification component is located on the top right side of the mixing chamber 1.

[0030] Furthermore, the concentration assembly includes a support plate 7, a concentration tank 8, an electric heating tube 9, and a discharge pipe 10. The support plate 7 is located on the right side of the mixing chamber 1. The concentration tank 8 is located on the top of the support plate 7. The electric heating tube 9 is located inside the concentration tank 8. The discharge pipe 10 is located at the bottom right side of the concentration tank 8. A valve is located at the connection between the discharge pipe 10 and the concentration tank 8.

[0031] Furthermore, the condensation assembly includes a conduit 11, a condenser pipe 12, a condensation box 13, and a cooler 14. The condensation box 13 is located on top of the concentration tank 8. The condenser pipe 12 is installed inside the condensation box 13. The condenser pipe 12 is connected to the conduit 11 via a connecting rod. The other end of the condenser pipe 12 extends to the outside of the condensation box 13. A valve is installed at the connection between the condenser pipe 12 and the condensation box 13. The conduit 11 has an inverted U-shaped structure. Both ends of the bottom of the conduit 11 are connected to the top of the concentration tank 8. The cooler 14 is installed on the outside of the condensation box 13.

[0032] Furthermore, the stirring assembly includes a motor 15, a rotating rod 16, a stirring rod 17, and a scraper 18. The motor 15 is installed on the top of the stirring chamber 1, and the rotating rod 16 is mounted on the rotating shaft of the motor 15, extending into the interior of the stirring chamber 1.

[0033] Furthermore, three stirring rods 17 are installed on both sides of the rotating rod 16, and scrapers 18 are fixedly installed on the outer side of each stirring rod 17. The outer wall of each scraper 18 is in contact with the inner wall of the electric heating plate 5.

[0034] Furthermore, the purification assembly includes a purification chamber 19, a filter screen 20, an activated carbon plate 21, a connecting plate 22, a slider, and an exhaust pipe. The purification chamber 19 is located on the top right side of the mixing chamber 1, and the purification chamber 19 is connected to the mixing chamber 1 through a connecting pipe. Both sides of the filter screen 20 and the activated carbon plate 21 are provided with connecting plates 22, which are slidably connected to the purification chamber 19. A sealing plate is provided on the outside of the connecting plate 22, and a handle is provided on the outside of the sealing plate.

[0035] Working principle: The chemicals required for the preparation of phosphoric acid are fed into the mixing chamber 1 through the feed pipe. The top of the feed pipe is equipped with a cover plate to ensure the airtightness of the phosphoric acid reaction.

[0036] The rotating rod 16 is driven by the motor 15 to rotate, and the rotating rod 16 drives the stirring rod 17 and the scraper 18 to make circular motion in the mixing chamber 1, so as to fully stir the material and ensure that the material is heated evenly. At the same time, the outer wall of the scraper 18 contacts the inner wall of the electric heating plate 5, effectively scraping off the material adhering to the electric heating plate 5 and preventing scaling.

[0037] The exhaust gas generated in the mixing chamber 1 enters the purification chamber 19 of the purification component through a connecting pipe. In the purification chamber 19, the exhaust gas passes sequentially through the filter screen 20 and the activated carbon plate 21 to remove harmful substances such as dust and acidic gases. The purified gas is discharged outside the device through the exhaust pipe, ensuring that the emitted exhaust gas meets environmental protection requirements.

[0038] The electric heating plate 5 is energized and heats up to preheat the material in the mixing chamber 1, promoting the dissolution and separation of solid impurities. The preheated material enters the conveying pipe 4 through the feed hopper 2 and the feed pipe 3. Before entering the conveying pipe 4, the phosphoric acid is initially filtered by the filter plate 6 to remove undissolved impurities and improve the subsequent concentration quality of phosphoric acid, and then it is ready to enter the concentration unit.

[0039] The preheated and filtered material enters the concentration tank 8 of the concentration component through the feed pipe 4. The concentration tank 8 is equipped with an electric heating element 9 for further heating and concentration of the material. The steam generated during the concentration process enters the condensation component through the conduit 11.

[0040] Steam generated in the concentration tank 8 is introduced into the condenser 13 through conduit 11. The condenser 13 is equipped with a condenser pipe 12. The steam exchanges heat with the cold air blown out by the air cooler 14 in the condenser pipe 12 to achieve condensation of the steam. The condensed water is discharged through the other end of the condenser pipe 12 and can be recycled.

[0041] After concentration, the concentrated phosphoric acid is discharged through the discharge pipe 10. A valve is installed at the connection between the discharge pipe 10 and the concentration tank 8 to facilitate control of the discharge process.

[0042] The filter screen 20 and activated carbon plate 21 in the purification assembly can be easily replaced or cleaned through the sliding connection between the connecting plate 22 and the purification chamber 19, ensuring the purification effect.

[0043] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model 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 this utility model should be included within the protection scope of this utility model.

Claims

1. A waste heat recovery device for a phosphoric acid concentration process, characterized in that, include: A mixing chamber (1) is provided with a feed pipe on the top left side of the mixing chamber (1), a cover plate on the top of the feed pipe, a support frame on the bottom of the mixing chamber (1), a guide hopper (2) inside the mixing chamber (1), a guide pipe (3) at the bottom of the guide hopper (2), a solenoid valve at the connection between the guide pipe (3) and the guide hopper (2), a conveying pipe (4) at the bottom of the mixing chamber (1), the conveying pipe (4) having an L-shaped structure, a mixing assembly inside the mixing chamber (1), an electric heating plate (5) on the inner wall of the mixing chamber (1), the electric heating plate (5) having an annular structure, the inner diameter of the electric heating plate (5) being the same as the inner diameter of the mixing chamber (1), a filter plate (6) movably arranged inside the mixing chamber (1), the filter plate (6) being arranged at the bottom of the guide hopper (2), and a controller being arranged outside the mixing chamber (1). A concentration assembly is disposed on the right side of the mixing chamber (1); A condensation assembly is disposed on top of the concentration assembly; A purification component is disposed on the top right side of the mixing chamber (1).

2. The waste heat recovery device for phosphoric acid concentration process according to claim 1, characterized in that, The concentration assembly includes a support plate (7), a concentration tank (8), an electric heating tube (9), and a discharge pipe (10). The support plate (7) is located on the right side of the mixing chamber (1). The concentration tank (8) is located on the top of the support plate (7). The electric heating tube (9) is located inside the concentration tank (8). The discharge pipe (10) is located at the bottom right side of the concentration tank (8). A valve is located at the connection between the discharge pipe (10) and the concentration tank (8).

3. The waste heat recovery device for phosphoric acid concentration process according to claim 2, characterized in that, The condensation assembly includes a conduit (11), a condenser pipe (12), a condensation box (13), and a cooler (14). The condensation box (13) is located on top of the concentration tank (8). The condenser pipe (12) is installed inside the condensation box (13). The condenser pipe (12) is connected to the conduit (11) via a connecting rod. The other end of the condenser pipe (12) extends to the outside of the condensation box (13). A valve is installed at the connection between the condenser pipe (12) and the condensation box (13). The conduit (11) has an inverted U-shaped structure. Both ends of the bottom of the conduit (11) are connected to the top of the concentration tank (8). A cooler (14) is installed on the outside of the condensation box (13).

4. The waste heat recovery device for phosphoric acid concentration process according to claim 1, characterized in that, The stirring assembly includes a motor (15), a rotating rod (16), a stirring rod (17), and a scraper (18). The motor (15) is located on the top of the stirring chamber (1). The rotating rod (16) is mounted on the rotating shaft of the motor (15) and extends into the interior of the stirring chamber (1).

5. A waste heat recovery device for a phosphoric acid concentration process according to claim 4, characterized in that, Three stirring rods (17) are installed on both sides of the rotating rod (16), and scrapers (18) are fixedly installed on the outer side of each stirring rod (17). The outer wall of each scraper (18) is in contact with the inner wall of the electric heating plate (5).

6. The waste heat recovery device for phosphoric acid concentration process according to claim 1, characterized in that, The purification assembly includes a purification chamber (19), a filter screen (20), an activated carbon plate (21), a connecting plate (22), a slider, and an exhaust pipe. The purification chamber (19) is located on the top right side of the stirring chamber (1). The purification chamber (19) and the stirring chamber (1) are connected by a connecting pipe. The filter screen (20) and the activated carbon plate (21) are provided with the connecting plate (22) on both sides. The connecting plate (22) is slidably connected to the purification chamber (19). A sealing plate is provided on the outside of the connecting plate (22), and a handle is provided on the outside of the sealing plate.

Images