A yellow phosphorus tail gas cooling and phosphorus collecting equipment

Abstract

The technical scheme of the present application provides a yellow phosphorus tail gas cooling and phosphorus collecting equipment, comprising: a cooling and recovery box, a heat preservation box seat and a heat exchange structure; one side of the cooling and recovery box is provided with an air inlet, and the other side of the cooling and recovery box is provided with an air outlet; the heat preservation box seat is installed at the bottom of the cooling and recovery box, and the bottom of the heat preservation box seat is provided with a discharge valve. The heat exchange structure contacts the yellow phosphorus tail gas with the outer surface of the curved tube and exchanges heat in a way, which avoids the blockage problem caused by the flow of yellow phosphorus tail gas in the pipeline, and utilizes the self-characteristics of yellow phosphorus being liquid at about 40 degrees Celsius to cool and convert it into liquid for recovery and collection, which has good recovery and collection effect. Further, the self-cleaning mode formed by the overflow pipe structure and the overflow fence can automatically flush the outer surface of the curved tube to prevent the attachment of yellow phosphorus outside and improve the service life.

Description

Technical Field

[0001] This invention relates to the field of yellow phosphorus tail gas treatment technology, and in particular to a yellow phosphorus tail gas cooling and phosphorus recovery device. Background Technology

[0002] Yellow phosphorus tail gas is the exhaust gas produced by boilers that produce yellow phosphorus. It is caused by incomplete combustion and pollutes the atmosphere. Yellow phosphorus tail gas contains phosphorus and impurities.

[0003] There are numerous devices for the recovery and treatment of yellow phosphorus tail gas. For example, there is a high-efficiency utilization device for yellow phosphorus tail gas, which is authorized by Chinese utility model patent CN 217829346 U. It can effectively capture minerals in yellow phosphorus tail gas from multiple angles in a disordered manner, greatly improving the mineral capture effect. It is an effective way to recover and utilize yellow phosphorus tail gas. However, this method does not make good use of the characteristics of yellow phosphorus itself for recovery, and the tail gas temperature is high. It is not effectively cooled down, which is not conducive to subsequent purification.

[0004] The current yellow phosphorus tail gas contains more than 85% CO, making it a good fuel and raw material. However, the yellow phosphorus tail gas has a high temperature and contains a lot of phosphorus and impurities, requiring effective recovery of yellow phosphorus. Furthermore, the yellow phosphorus tail gas has a significant impact on the tail gas purification of subsequent processes and can also corrode equipment. There are many side reactions in the tail gas purification process. During the tail gas treatment process, the flow pipes for tail gas heat exchange are prone to blockage and have a short service life. Currently, no effective solutions have been proposed for the problems in the relevant technologies. Summary of the Invention

[0005] In view of this, it is necessary to provide a yellow phosphorus tail gas cooling and phosphorus recovery device to solve the technical problem of easy blockage of pipelines in the existing technology for yellow phosphorus tail gas cooling and yellow phosphorus recovery.

[0006] To achieve the above technical objectives, the present invention provides a yellow phosphorus tail gas cooling and phosphorus recovery device, comprising: a cooling and recovery box, an insulation box base, and a heat exchange structure; an air inlet is provided on one side of the cooling and recovery box, and an air outlet is provided on the other side of the cooling and recovery box; the insulation box base is installed at the bottom of the cooling and recovery box, and a discharge valve is provided at the bottom of the insulation box base;

[0007] The heat exchange structure is installed inside the cooling and recovery tank. The heat exchange structure includes a diversion valve, a diversion pipe structure, a curved pipe, an overflow enclosure, and an overflow pipe structure. Both the diversion pipe structure and the overflow pipe structure are connected to the diversion valve. The overflow enclosure is fixed to the top of the curved pipe. The function of the overflow pipe structure is to transport liquid to the overflow enclosure at the top of the curved pipe. The function of the diversion pipe structure is to transport liquid to the inside of the curved pipe.

[0008] Furthermore, there are two heat exchange structures, the curved pipe is flush with the outer surface of the overflow enclosure, there are two diversion pipe structures, and there are four curved pipes and four overflow enclosures. A temperature sensor is installed on the outside of the curved pipe.

[0009] Furthermore, the bottom end of the curved tube penetrates through the insulation box base and extends to the bottom of the insulation box base, and a manifold is provided between the bottoms of the four corresponding curved tubes.

[0010] Furthermore, the diversion valve includes a central pipe, two side valves, and an end valve. The two side valves are fixed on both sides of the central pipe, and the end valve is fixed at the bottom of the central pipe. The two side valves are connected to two diversion pipe structures, and the end valve is connected to an overflow pipe structure. An inlet pipe is provided at the top of the central pipe.

[0011] Furthermore, the overflow pipe structure includes a horizontal pipe and an outlet pipe. The horizontal pipe is connected to an end valve. There are four outlet pipes, all of which are fixed at the bottom of the horizontal pipe and are located directly above the four curved pipes.

[0012] Furthermore, the diversion pipe structure includes branch pipes, bends, and connecting pipes. There are four bends and eight connecting pipes. All four bends are connected to the branch pipes, and the two connecting pipes are connected to a corresponding bend.

[0013] Furthermore, the eight connecting pipes are divided into two groups, and the two groups of connecting pipes are respectively connected to two curved pipes.

[0014] Furthermore, the heat preservation box base is shaped like a trapezoid, and the heat preservation box base includes a base body, a cavity, an electric heating tube, and a temperature sensor.

[0015] Furthermore, the cavity is formed inside the base, the heating element is installed inside the cavity, and a discharge hole is formed at the bottom of the base. The position of the second temperature sensor corresponds to the position of the discharge hole.

[0016] Furthermore, the four side walls of the cooling and recovery box are equipped with a spray structure, which includes water pipes and spray heads. The water pipes are fixed on the side walls of the cooling and recovery box, and a number of spray heads are arranged in a linear array at the bottom of the water pipes.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: By using a heat exchange structure to contact the outer surface of the curved pipe with the yellow phosphorus exhaust gas for heat exchange, the blockage problem that is easily caused by the yellow phosphorus exhaust gas flowing in the pipeline is avoided. Furthermore, by utilizing the inherent property that yellow phosphorus is liquid at around 40 degrees Celsius, it is cooled down and converted into liquid for recycling and collection, resulting in good recycling and collection effects. In addition, the self-cleaning mode formed by the overflow pipe structure and overflow enclosure can automatically flush the outer surface of the curved pipe, preventing the external adhesion of yellow phosphorus and extending its service life. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the yellow phosphorus tail gas cooling and phosphorus recovery equipment according to an embodiment of the present invention;

[0019] Figure 2 This is a three-dimensional top-view diagram of the yellow phosphorus tail gas cooling and phosphorus collection device according to an embodiment of the present invention, with the top cover removed.

[0020] Figure 3 This is a three-dimensional diagram of the heat exchange structure according to an embodiment of the present invention;

[0021] Figure 4 This is a cross-sectional view of the heat preservation box base according to an embodiment of the present invention.

[0022] Figure 5 According to the embodiments of the present invention Figure 2 A magnified view of part A;

[0023] In the diagram: 1. Cooling and recovery box; 11. Air inlet; 12. Air outlet;

[0024] 2. Insulated box base; 21. Base body; 22. Cavity; 23. Heating element; 24. Temperature sensor two; 25. Discharge hole;

[0025] 3. Discharge valve;

[0026] 4. Heat exchange structure; 41. Diversion valve; 411. Intermediate pipe; 412. Side valve; 413. End valve; 42. Diversion pipe structure; 421. Branch pipe; 422. Bend; 423. Connecting pipe; 43. Curved pipe; 44. Overflow containment; 45. Overflow pipe structure; 451. Horizontal pipe; 452. Outlet pipe; 46. Temperature sensor one; 401. Inlet pipe; 402. Manifold;

[0027] 5. Spray structure; 51. Water pipe; 52. Spray head. Detailed Implementation

[0028] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0029] like Figure 1-3 As shown, this invention provides a yellow phosphorus tail gas cooling and phosphorus recovery device, including a cooling and recovery chamber 1, an insulation chamber base 2, and a heat exchange structure 4. An air inlet 11 is provided on one side of the cooling and recovery chamber 1, and an air outlet 12 is provided on the other side. Yellow phosphorus tail gas is introduced through the air inlet 11. The yellow phosphorus tail gas contacts the heat exchange structure 4 in the cooling and recovery chamber 1 and exchanges heat to approximately 40 degrees Celsius, thus converting it into a liquid state that flows downwards and accumulates in the insulation chamber base 2. The insulation chamber base 2 maintains the liquid recovered yellow phosphorus at a constant temperature of 40 degrees Celsius, preventing solidification due to excessively low temperatures and ensuring it remains in a liquid state within the insulation chamber base 2, minimizing internal blockage. The insulation chamber base 2 is installed at the bottom of the cooling and recovery chamber 1, and a discharge valve 3 is provided at the bottom of the insulation chamber base 2. When it is necessary to discharge the recovered yellow phosphorus, the discharge valve 3 is opened to discharge it, making operation convenient and easy.

[0030] Specifically, to achieve effective heat exchange, anti-clogging, and self-cleaning effects, two heat exchange structures 4 are installed inside the cooling and recovery box 1. The heat exchange structures 4 are symmetrically distributed and include a diversion valve 41, a diversion pipe structure 42, a curved pipe 43, an overflow baffle 44, and an overflow pipe structure 45. The overflow pipe structure 45 and the overflow baffle 44 form the self-cleaning part. The curved pipe 43 changes the original straight pipe pattern of the heat exchange pipeline, increasing the surface area. This, combined with the external flow of yellow phosphorus exhaust gas, avoids internal blockage caused by the yellow phosphorus exhaust gas flowing inside the pipe. Furthermore, the large external surface area of ​​the pipe makes it easier to clean. Both the diversion pipe structure 42 and the overflow pipe structure 45 are connected to the diversion valve 41, which controls the diversion pipe structure 42 and the overflow pipe structure 45. The heat exchange liquid flows through the 45th section, and the overflow baffle 44 is fixed to the top of the curved pipe 43. The function of the overflow pipe structure 45 is to transport the liquid to the overflow baffle 44 at the top of the curved pipe 43. When the overflow pipe structure 45 transports the liquid to the overflow baffle 44, the liquid slowly accumulates in the overflow baffle 44. When the accumulation is higher than the overflow baffle 44, it overflows from the edge of the overflow baffle 44 and slides down along the overflow baffle 44 and the outer surface of the curved pipe 43, rinsing the outer surface of the curved pipe 43. With the temperature control of the liquid, the solidified yellow phosphorus can be converted into liquid and flushed down together during the flow, achieving self-cleaning and improving the service life of the overall heat exchange pipeline. The function of the diversion pipe structure 42 is to transport the liquid to the inside of the curved pipe 43. By transporting the heat exchange liquid to the inside of the curved pipe 43, heat exchange and cooling are carried out when the yellow phosphorus exhaust gas comes into contact with the curved pipe 43.

[0031] During use, air is introduced through the air inlet 11. Inside the cooling and recovery box 1, the diversion valve 41 on the heat exchange structure 4 outputs heat exchange liquid to the diversion pipe structure 42. The heat exchange liquid enters the curved pipe 43, where the yellow phosphorus tail gas comes into contact with the curved pipe 43 for heat exchange. Finally, it flows out from the air outlet 12. During the heat exchange process, the yellow phosphorus tail gas is cooled to about 40 degrees Celsius, causing the yellow phosphorus to liquefy and accumulate inside the insulation box 2.

[0032] In this embodiment, to ensure that the liquid overflowing during self-cleaning can effectively rinse the surface of the curved pipe 43, refer to Figure 3 The outer surface of the curved pipe 43 is flush with the outer surface of the overflow baffle 44; in order to obtain a more uniform and effective heat exchange effect, refer to Figure 3 The number of the diversion pipe structure 42 is two, and the number of the curved pipes 43 and the overflow baffles 44 are four each. Heat exchange is performed using multiple curved pipes 43 arranged at equal intervals. Each curved pipe 43 is equipped with an overflow baffle 44 for subsequent self-cleaning. To achieve temperature control, refer to... Figure 3 A temperature sensor 46 is provided on the outside of the curved pipe 43. By setting up a number of temperature sensors 46, in conjunction with the temperature control of the input heat exchange liquid, the yellow phosphorus tail gas can be effectively cooled and its temperature controlled at about 40 degrees Celsius.

[0033] Understandably, the temperature sensor 46 is equipped with a controller for control. It is controlled according to the conventional operating methods of mature existing technologies to achieve effective temperature control. All of these are existing technologies, so we will not go into too much detail here.

[0034] In this embodiment, to facilitate control of the liquid input for self-cleaning and heat exchange, reference is made. Figure 3 The diversion valve 41 includes a middle pipe 411, two side valves 412, and an end valve 413. The two side valves 412 are fixed on both sides of the middle pipe 411, and the end valve 413 is fixed at the bottom of the middle pipe 411. The side valves 412 and the end valve 413 can be opened individually or simultaneously. The two side valves 412 are connected to two diversion pipe structures 42 respectively. By opening the side valves 412, the input of heat exchange liquid into the diversion pipe structure 42 is opened, which controls the start of the heat exchange mode. The end valve 413 is connected to the overflow pipe structure 45. By opening the end valve 413, the liquid input into the overflow pipe structure 45 is opened, which controls the start of the self-cleaning mode. The top of the middle pipe 411 is provided with an inlet pipe 401, which provides centralized liquid supply.

[0035] Understandably, the inlet pipe 401 is connected to a circulating water tank that outputs temperature-controlled liquid. The circulating water tank is an existing mature technology device that can input liquid with temperature so that the liquid can have a temperature that melts yellow phosphorus during self-cleaning.

[0036] In this embodiment, in order to achieve a uniform overflow self-cleaning effect, reference is made to... Figure 3 The overflow pipe structure 45 includes a horizontal pipe 451 and an outlet pipe 452. The horizontal pipe 451 is connected to an end valve 413. When the end valve 413 is open, liquid is introduced into the horizontal pipe 451. There are four outlet pipes 452, all of which are fixed to the bottom of the horizontal pipe 451. The liquid inside the horizontal pipe 451 flows to the four outlet pipes 452, and the four outlet pipes 452 are located directly above the four curved pipes 43. The four outlet pipes 452 discharge the liquid to the top of the curved pipes 43 and directly accumulate it in the overflow enclosure 44.

[0037] Understandably, the height of the overflow enclosure 44 should be sufficient to accumulate liquid and allow it to slide off its outer surface in an overflow manner.

[0038] In this embodiment, in order to achieve uniform input of the heat exchange fluid, reference is made. Figure 3 The diversion pipe structure 42 includes branch pipes 421, bends 422, and connecting pipes 423. There are four bends 422 and eight connecting pipes 423. All four bends 422 are connected to the branch pipes 421 and are in communication with the branch pipes 421. Two connecting pipes 423 are connected to a corresponding bend 422. The eight connecting pipes 423 are divided into two groups, and the two groups of connecting pipes 423 are respectively connected to two curved pipes 43 and are in communication with the curved pipes 43. The branch pipes 421 are connected to a side valve 412. When the side valve 412 is open, heat exchange liquid is input into the branch pipes 421. The heat exchange liquid is diverted through the branch pipes 421 to the four bends 422, and then from the four bends 422 to the eight connecting pipes 423, thereby inputting the heat exchange liquid into the curved pipes 43.

[0039] Optionally in this embodiment, in order to facilitate centralized circulation of the heat exchange liquid in the curved pipe 43, the bottom end of the curved pipe 43 penetrates through the insulation box base 2 and extends to the bottom of the insulation box base 2, and a manifold 402 is provided between the bottoms of the four corresponding curved pipes 43, through which the heat exchange liquid is concentrated and transported to the circulation device for fluid circulation.

[0040] Understandably, the converging liquid is connected to the temperature-controlled output liquid circulation tank through the manifold 402, and is then drawn into the tank for circulation.

[0041] Optionally, in order to effectively achieve the effect of yellow phosphorus accumulating in liquid, refer to the following in this embodiment. Figure 1 and Figure 4 The heat preservation box base 2 is trapezoidal in shape. The heat preservation box base 2 includes a base 21, a cavity 22, a heating element 23, and a temperature sensor 24. The heating element 23 heats the base 21.

[0042] The temperature sensor 24 detects the temperature. The cavity 22 is opened inside the seat 21. The cavity 22 is located inside the side wall of the seat 21. The heating tube 23 is installed inside the cavity 22 and heats the inner side wall of the seat 21. The bottom of the seat 21 is provided with a discharge hole 25, which corresponds to the discharge valve 3.

[0043] Understandably, the position of the second temperature sensor 24 corresponds to the position of the discharge hole 25. The insulation box base 2 is also equipped with a temperature controller, which is electrically connected to the second temperature sensor 24 and the heating element 23. Temperature control is performed using conventional and mature existing control methods.

[0044] To ensure that the insulation box base 2 maintains a constant temperature of 40 degrees Celsius, all of these are existing technologies and will not be elaborated on here.

[0045] Optionally in this embodiment, in order to achieve the same self-cleaning effect on the inner wall of the cooling and recovery tank 1, refer to... Figure 2 and Figure 5 The cooling recovery tank 1 has spray structures 55 on all four side walls. Each spray structure 55 includes a water pipe 51 and spray heads 52. The water pipe 51 is fixed to the side wall of the cooling recovery tank 1. Several spray heads 52 are arranged in a linear array at the bottom of the water pipe 51. The number of spray heads 52 depends on the spray range and the size of the cooling recovery tank 1. All spray heads 52 face the inner side wall of the cooling recovery tank 1 and are connected to the liquid delivery structure by the water pipe 51.

[0046] The liquid is fed at 40 degrees Celsius and sprayed from the spray head 52 toward the inner wall of the cooling and recovery tank 1, thereby self-cleaning the inner wall of the cooling and recovery tank 1 and reducing the amount of yellow phosphorus that cools and solidifies onto the inner wall of the cooling and recovery tank 1.

[0047] Understandably, all four water pipes 51 are connected to the circulating water tank that outputs temperature-controlled liquid, and control valves are installed between them for control. In use, liquid is input into the water pipes 51 and sprayed by the spray head 52.

[0048] 5. Working principle of the invention: In use, heat exchange liquid is introduced into the inlet pipe 401, and the side valve 412 is opened. The heat exchange liquid flows from the middle pipe 411 through the side valve 412 into the branch pipe 421. Under the diversion of the bend pipe 422 and the connecting pipe 423, it flows into the arc-shaped pipe 43, is accumulated in the manifold 402, and then circulates back. At this time, yellow phosphorus tail gas is introduced into the air inlet 11. The yellow phosphorus tail gas contacts the arc-shaped pipe 43 for heat exchange. After heat exchange, the tail gas is discharged from the air outlet 12. The yellow phosphorus that has been heated to 40 degrees Celsius and turned into liquid slides down and accumulates in the heat preservation box base 2. In the middle, the internal temperature of the heat preservation box 2 is maintained at about 40 degrees Celsius to ensure that the yellow phosphorus is in a liquid state inside. The liquid yellow phosphorus can be discharged by opening the discharge valve 3. Through the self-cleaning mode set at intervals, when in use, the end valve 413 is opened, the liquid flows into the horizontal pipe 451, and is introduced into the overflow enclosure 44 by the water outlet pipe 452. The liquid accumulates and overflows from the outer edge of the overflow enclosure 44, and washes along the outer surface of the curved pipe 43, thereby washing off the yellow phosphorus attached to the curved pipe 43. The self-cleaning is convenient and improves the service life of the curved pipe 43.

[0049] The entire workflow is now complete, and anything not described in detail in this specification is existing technology known to those skilled in the art.

[0050] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for cooling and recovering phosphorus from yellow phosphorus tail gas, characterized in that, include: The cooling recovery box includes a cooling recovery chamber, an insulation box base, and a heat exchange structure. An air inlet is located on one side of the cooling recovery chamber, and an air outlet is located on the other side. The insulation box base is installed at the bottom of the cooling recovery chamber, and a discharge valve is located at the bottom of the insulation box base. The heat exchange structure is installed inside the cooling and recovery box. The heat exchange structure includes a diversion valve, a diversion pipe structure, a curved pipe, an overflow enclosure, and an overflow pipe structure. The diversion pipe structure and the overflow pipe structure are both connected to the diversion valve. The overflow enclosure is fixed to the top of the curved pipe. The overflow pipe structure is used to transport liquid into the overflow enclosure at the top of the curved pipe, and the diversion pipe structure is used to transport liquid into the interior of the curved pipe. The curved pipe is flush with the outer surface of the overflow enclosure, and a temperature sensor is installed on the outer side of the curved pipe.

2. The yellow phosphorus tail gas cooling and phosphorus recovery equipment according to claim 1, characterized in that... The number of heat exchange structures is two, the number of diversion pipe structures is two, and the number of curved pipes and overflow barriers is four each.

3. The yellow phosphorus tail gas cooling and phosphorus recovery equipment according to claim 2, characterized in that... The bottom end of the curved tube passes through the insulation box base and extends to the bottom of the insulation box base, and a manifold is provided between the bottoms of the four corresponding curved tubes.

4. The yellow phosphorus tail gas cooling and phosphorus recovery equipment according to claim 3, characterized in that, The diversion valve includes a central pipe, two side valves and one end valve. The two side valves are fixed on both sides of the central pipe, and the end valve is fixed at the bottom of the central pipe. The two side valves are connected to two diversion pipe structures, and the end valve is connected to an overflow pipe structure. An inlet pipe is provided at the top of the central pipe.

5. The yellow phosphorus tail gas cooling and phosphorus recovery equipment according to claim 4, characterized in that, The overflow pipe structure includes a horizontal pipe and an outlet pipe. The horizontal pipe is connected to an end valve. There are four outlet pipes, all of which are fixed at the bottom of the horizontal pipe and are located directly above four curved pipes.

6. The yellow phosphorus tail gas cooling and phosphorus recovery equipment according to claim 5, characterized in that, The diversion pipe structure includes branch pipes, bends, and connecting pipes. There are four bends and eight connecting pipes. All four bends are connected to the branch pipes, and the two connecting pipes are connected to a corresponding bend.

7. The yellow phosphorus tail gas cooling and phosphorus recovery equipment according to claim 6, characterized in that, The eight connecting pipes are divided into two groups, and the two groups of connecting pipes are respectively connected to two curved pipes.

8. The yellow phosphorus tail gas cooling and phosphorus recovery equipment according to claim 7, characterized in that, The heat preservation box base is shaped like a trapezoid and includes a base body, a cavity, an electric heating tube, and a temperature sensor.

9. The yellow phosphorus tail gas cooling and phosphorus recovery equipment according to claim 8, characterized in that, The cavity is formed in the seat body, the heating element is installed in the cavity, and a discharge hole is formed at the bottom of the seat body. The position of the second temperature sensor corresponds to the position of the discharge hole.

10. The yellow phosphorus tail gas cooling and phosphorus recovery equipment according to claim 9, characterized in that, The cooling and recovery box is equipped with a spray structure on all four side walls. The spray structure includes water pipes and spray heads. The water pipes are fixed on the side walls of the cooling and recovery box, and a number of spray heads are arranged in a linear array at the bottom of the water pipes.

Images