A system and method for dehydrating and recycling waste heat from calcined modified phosphogypsum

Abstract

The present application relates to a system and method for dehydrating and recycling waste heat of calcined modified phosphogypsum, and relates to the field of dehydrating and drying phosphogypsum, in order to solve the problem of poor use effect of heat injected by existing waste heat recovery devices, wherein a system and device for dehydrating and recycling waste heat of calcined modified phosphogypsum includes a waste heat recovery device, a drying box, and a vent pipe for passing the heat in the waste heat recovery device into the drying box, the drying box is provided with a heating mechanism, the heating mechanism includes a connecting assembly, the connecting assembly includes a connecting box arranged on the drying box, the vent pipe is connected to the drying box through the connecting box; a circulating heating assembly for heating the gas discharged from the vent pipe, the circulating heating assembly is arranged inside the connecting box; a guide piece for evenly blowing the gas to the inside of the drying box. The present application has the function of heating the gas discharged from the vent pipe by the circulating heating assembly, thereby improving the use effect of the waste heat recovery device injecting heat into the dryer.

Description

Technical Field

[0001] The present application relates to the field of dehydration and drying of phosphogypsum, and in particular to a system equipment and method for recycling waste heat dehydration of calcined modified phosphogypsum. Background Art

[0002] Phosphogypsum is a solid waste produced in the wet phosphoric acid process, and its main component is calcium sulfate dihydrate. The composition of phosphogypsum is relatively complex. In addition to calcium sulfate, there are also incompletely decomposed phosphate ore, residual phosphoric acid, fluoride, acid insoluble matter, organic matter, etc. Among them, the presence of fluorine and organic matter has the greatest impact on the resource utilization of phosphogypsum. On the basis of ensuring that the process conditions are met, improving the thermal efficiency of these thermal equipment is the key to energy saving and consumption reduction in production. Waste heat utilization has become a new hot spot for investment in many industries. Make full use of the waste heat of waste gas in some production processes to reduce production power consumption and save energy.

[0003] The Chinese patent with publication number CN112811837A discloses a system equipment and method for dehydrating and drying phosphogypsum with high-temperature waste heat of recycled aggregate, including a drying box and a waste heat recovery device, one end of the top of the drying box is connected to a hot air blower through a pipeline, a filter is fixedly installed inside the movable frame, a driving rod is sleeved inside the mounting frame, first cams are fixedly installed at both ends of the outside of the driving rod, second cams are fixedly installed at both ends of the outside of the driving rod, a driving motor is fixedly installed on the side of the driving rod away from the drying box, and a reset spring is fixedly installed on one side of the inner wall of the hollow plate. By connecting the drying box and the waste heat recovery device with a vent pipe, the heat recovered in the waste heat recovery device for recycled aggregate is introduced into the interior of the drying box, and the recovered waste heat is used to dehydrate and dry the phosphogypsum inside the drying box, thereby achieving the effect of saving energy, making full use of energy, and reducing power consumption in production.

[0004] In the above-mentioned related technologies, the waste heat recovery device recovers the waste heat of the recycled aggregate, and then introduces it into the interior of the drying box through the ventilation pipe. At the same time, heat is injected into the interior of the drying box through the hot air blower. The heat will be dissipated when it is transported in the ventilation pipe. When the heat enters the drying box, less heat will be left. After the heat generated by the hot air blower is mixed with the heat generated by the ventilation pipe, the heat will be reduced, affecting the use effect of the waste heat after collection. Summary of the invention

[0005] In order to improve the utilization effect of the heat injected into the waste heat recovery device, the present application provides a system equipment and method for dehydrating and recycling the waste heat of calcined modified phosphogypsum.

[0006] The present application provides a calcined modified phosphogypsum waste heat dehydration recycling system equipment, which adopts the following technical solution:

[0007] A system for dehydrating and recycling waste heat from calcined modified phosphogypsum, comprising a waste heat recovery device, a drying box and a vent pipe for passing heat from the waste heat recovery device into the drying box, the drying box being provided with a heating mechanism, the heating mechanism comprising a connecting assembly, the connecting assembly comprising a connecting box arranged on the drying box, the vent pipe being connected to the drying box via the connecting box; a circulating heating assembly for heating gas discharged from the vent pipe, the circulating heating assembly being arranged inside the connecting box; and a flow guide for blowing gas evenly toward the inside of the drying box.

[0008] By adopting the above technical solution, the waste heat recovery device is used to collect heat and input the heat into the drying box through the ventilation pipe to heat and dry the phosphogypsum in the drying box. The heat in the ventilation pipe is first passed into the connecting box before entering the drying box, and the gas passed into the ventilation pipe is further heated by the circulating heating component, thereby improving the use effect of the waste heat recovery device to inject heat into the dryer.

[0009] Optionally, a plurality of communication holes are provided on the connection box, and the ventilation pipe is detachably connected to the communication holes, and each of the communication holes is provided with a blocking component.

[0010] By adopting the above technical solution, a plurality of connecting holes are opened on the connecting box. When the ventilation pipes are connected to the connecting holes, it is convenient to introduce heat into the connecting box body. Different numbers of ventilation pipes can be connected to the connecting box according to the number of waste heat recovery devices, thereby improving the utilization rate of the collected waste heat.

[0011] Optionally, the blocking assembly includes a blocking block, which is threadedly connected to the connecting hole. The blocking block is provided with a connecting hole movably connected to the interior of the connecting box, and the connecting hole is connected to the outside of the connecting box.

[0012] By adopting the above technical solution, the connecting hole of the connection box is blocked by a blocking block. When the ventilation pipe is connected, the blocking block is rotated to connect the connecting hole on the blocking block with the interior of the connection box. At this time, after the ventilation pipe is connected to the connecting hole on the connection box, the connection between the ventilation pipe and the connection box is achieved. The structure is simple and easy to use.

[0013] Optionally, a connector is provided at one end of the ventilation pipe away from the waste heat recovery device, the connector is threadedly connected and adapted to the connecting hole, an air outlet hole connected to the ventilation pipe is opened on the connector, and the air outlet hole is movably connected to the connecting hole.

[0014] By adopting the above technical solution, the air outlet on the connecting head is connected to the ventilation pipe, and the connection with the connecting hole is achieved by rotating the connecting head, and then the ventilation pipe is connected to the inside of the connecting box. The heat in the waste heat recovery device can be injected into the connecting box through the ventilation pipe, and the structure is simple and easy to connect.

[0015] Optionally, a plug-in block is provided on the connector, and a plug-in slot adapted to be plugged into the plug-in block is provided on the blocking block.

[0016] By adopting the above technical solution, when connecting the connector to the connecting hole, the plug-in block on the connector is inserted into the plug-in slot on the blocking block. When the connector is rotated, the blocking block is driven to rotate at the same time. When the connection of the connector is completed, the blocking block is opened, and the operation is more convenient and simple.

[0017] Optionally, the blocking block and the connecting head are both sleeved with sealing rings, and the sealing rings are movably abutted against the inner wall or the outer wall of the connecting box.

[0018] By adopting the above technical solution, the sealing ring on the sealing block abuts against the inner wall of the connecting box, thereby improving the sealing effect of the sealing block on the connecting hole and reducing the heat loss in the connecting box from the connecting hole. The sealing ring on the connecting head abuts against the outer wall of the connecting box, thereby improving the sealing of the connection between the connecting head and the connecting hole and reducing the heat loss in the ventilation pipe.

[0019] Optionally, the circulating heating component includes an electric heating wire, a heat pipe and an exhaust pump, the electric heating wire is arranged inside the connecting box, one end of the heat pipe is connected to the drying box, the other end of the heat pipe is connected to the waste heat recovery device, and the exhaust pump is arranged on the heat pipe.

[0020] By adopting the above technical solution, the electric heating wire heats the inside of the connecting box and further heats the gas entering the ventilation pipe, so that the gas entering the drying box is maintained at a relatively high temperature, and the gas entering the connecting box through the ventilation pipe has a certain temperature, thereby improving the heating efficiency and reducing the energy used during heating. After starting the vacuum pump, the heat pipe can transport the heat in the drying box to the waste heat recovery device again for reuse.

[0021] Optionally, the guide member includes a guide pipe, which is arranged on the inner wall of the drying box, and is provided with a plurality of guide holes facing the bottom of the drying box, and one end of the guide pipe is connected to the connection box.

[0022] By adopting the above technical solution, the heat in the connecting box enters the interior of the drying box through the guide pipe, the guide pipe guides the conduction of heat, and then discharges the heat through the guide holes on the guide pipe, so that the phosphogypsum is heated more evenly and the drying effect is improved.

[0023] Optionally, a heat insulation box is provided outside the connection box, and a vacuum cavity is provided between the heat insulation box and the connection box.

[0024] By adopting the above technical solution, the insulation box is installed on the outside of the connection box, and the insulation box and the connection box bracket are in a vacuum environment, which can reduce the heat loss inside the connection box, avoid energy waste, and improve the heating effect.

[0025] The present application provides a method for recycling waste heat dehydration system equipment for calcining modified phosphogypsum, which adopts the following technical solution:

[0026] A method for recycling waste heat dehydration system equipment for calcining modified phosphogypsum, comprising the following steps:

[0027] Step 1: Connect the ventilation pipe and the connection box, insert the plug-in block on the connector into the plug-in slot on the blocking block, rotate the connector to thread the connecting hole, make the sealing ring on the connector abut against the outer wall of the connection box, and the plug-in block drives the blocking block to rotate, and the blocking block moves toward the inside of the connection box, so that the connecting hole on the blocking block is connected with the inside of the connection box, and the connection box is connected with the ventilation pipe;

[0028] Step 2: introduce waste heat, and inject the collected heat into the connection box through the ventilation pipe through the waste heat recovery device;

[0029] Step 3: The electric heating wire is energized to further heat the heat introduced into the connection box by the waste heat recovery device, and then enters the drying box through the guide pipe;

[0030] Step 4: Stir the phosphogypsum in the drying box to ensure that the phosphogypsum is heated evenly;

[0031] Step 5: After drying is completed, start the vacuum pump to inject the heat in the drying box into the waste heat recovery device for reuse.

[0032] In summary, the present application includes at least the following beneficial technical effects:

[0033] The waste heat recovery device is used to collect heat, and the heat is input into the drying box through the ventilation pipe to heat and dry the phosphogypsum in the drying box. The heat in the ventilation pipe is first passed into the connection box before entering the drying box, and the gas introduced into the ventilation pipe is further heated by the circulating heating component, thereby improving the use effect of the waste heat recovery device injecting heat into the dryer; by setting a connection box, a plurality of connecting holes are provided on the connection box, and when the ventilation pipe is connected to the connecting hole, it is convenient to introduce heat into the connection box body, and different numbers of ventilation pipes can be connected to the connection box according to the number of waste heat recovery devices, thereby improving the utilization rate of the collected waste heat;

[0034] When connecting the connector to the connecting hole, the plug-in block on the connector is inserted into the plug-in slot on the blocking block. When the connector is rotated, the blocking block is driven to rotate at the same time. When the connection of the connector is completed, the blocking block is opened, and the operation is more convenient and simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0036] Figure 2 This is a schematic diagram showing the internal cross-sectional structure of a drying box according to an embodiment of the present application;

[0037] Figure 3 It is a schematic diagram of the internal cross-sectional structure of the display connection box according to an embodiment of the present application.

[0038] Figure numerals: 1. Waste heat recovery device; 2. Drying box; 3. Ventilation pipe; 31. Connector; 311. Air outlet; 312. Plug block; 4. Heating mechanism; 41. Connecting assembly; 411. Connecting box; 4111. Connecting hole; 42. Circulating heating assembly; 421. Heating wire; 422. Heat conducting pipe; 423. Vacuum pump; 43. Guide member; 431. Guide pipe; 4311. Guide hole; 44. Sealing assembly; 441. Sealing block; 4411. Connecting hole; 4412. Plug slot; 442. Sealing ring; 45. Heat insulation box. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-3 This application is described in further detail.

[0040] The embodiment of the present application discloses a system for dehydrating and recycling waste heat from calcined modified phosphogypsum.

[0041] Reference Figure 1 A calcined modified phosphogypsum waste heat dehydration recycling system comprises a waste heat recovery device 1, a drying box 2, a vent pipe 3 and a heating mechanism 4. The waste heat recovery device 1 stores the recovered heat, and the dried phosphogypsum is added to the drying box 2. The vent pipe 3 passes the heat recovered in the waste heat recovery device 1 into the drying box 2, and the gas heat passed into the drying box 2 is further heated by the heating mechanism 4, thereby improving the drying effect of the phosphogypsum. The drying box 2 is also provided with a stirrer for stirring the phosphogypsum.

[0042] Reference Figure 1-2 In order to pass the gas in the vent pipe 3 into the drying box 2, the heating mechanism 4 includes a connecting component 41, a circulating heating component 42 and a guide member 43. The vent pipe 3 is connected to the drying box 2 through the connecting component 41, and the gas is heated by the circulating heating component 42. The waste heat in the drying box 2 can be collected and stored in the waste heat recovery device 1. The gas passed into the drying box 2 is guided by the guide member 43, so that the gas is evenly blown into the drying box 2, so that the phosphogypsum is heated more evenly and the drying and dehydration effect is better.

[0043] Reference Figure 2In this embodiment, in order to connect the ventilation pipe 3 and the drying box 2, the connecting component 41 includes a connecting box 411 fixedly connected to the drying box 2, the connecting box 411 is connected to the drying box 2, and the guide member 43 includes a guide pipe 431, the guide pipe 431 is fixedly connected to the inner wall of the drying box 2, one end of the guide pipe 431 is connected to the connecting box 411, and the heat conduction is guided by the guide pipe 431. A plurality of guide holes 4311 facing the bottom of the drying box 2 are opened on the guide pipe 431, and the heat is discharged through the guide holes 4311 on the guide pipe 431, so that the phosphogypsum is heated more evenly and the dehydration and drying effect of the phosphogypsum is improved.

[0044] Reference Figure 1-2 In order to facilitate the connection between the vent pipe 3 and the connection box 411, a connecting hole 4111 is provided on the connection box 411, and the vent pipe 3 can be detachably connected to the connecting hole 4111 on the connection box 411. In this embodiment, a plurality of connecting holes 4111 are provided, so that the vent pipes 3 on a plurality of waste heat recovery devices 1 can be connected at the same time, and a plugging component 44 is provided at each of the connecting holes 4111;

[0045] When connecting the vent pipe 3, the connecting hole 4111 is opened first. In this embodiment, the blocking assembly 44 includes a blocking block 441, which is threadedly connected to the connecting hole 4111. The blocking block 441 is provided with a connecting hole 4411. One end of the connecting hole 4411 is connected to the outside of the connecting box 411, and the other end of the connecting hole 4411 extends to the side wall of the blocking block 441. By rotating the blocking block 441, the connecting hole 4411 is movably connected to the inside of the connecting box 411. When the rotating blocking block 441 moves toward the inside of the connecting box 411, the connecting hole 4111 is opened.

[0046] One end of the vent pipe 3 away from the waste heat recovery device 1 is fixedly connected with a connector 31, the connector 31 is threadedly connected and adapted to the connecting hole 4111, and an air outlet 311 connected to the vent pipe 3 is provided on the connector 31, and the connector 31 is rotated to achieve threaded connection with the connecting hole 4411 on the connecting box 411, so that the vent pipe 3 and the connecting box 411 are connected;

[0047] In order to improve the connection efficiency of the ventilation pipe 3, a plug-in block 312 is fixedly connected to the connector 31, and a plug-in groove 4412 which is plugged and adapted to the plug-in block 312 is opened on the blocking block 441. When the connector 31 is connected to the connecting hole 4111, the plug-in block 312 on the connector 31 is inserted into the plug-in groove 4412 on the blocking block 441. When the connector 31 is rotated, the blocking block 441 is driven to rotate simultaneously through the plug-in block 312. When the connection of the connector 31 is completed, the blocking block 441 is opened; when the connector 31 is removed, the plug-in block 312 is driven to rotate in the opposite direction when the connector 31 is rotated. When the connector 31 is removed, the blocking block 441 is closed to the connecting hole 4111.

[0048] Reference Figure 3 In order to improve the sealing performance of the sealing member on the connecting hole 4111 and the sealing performance between the connecting head 31 and the connecting hole 4111 when the connecting head 31 is connected to the connecting hole 4111, a sealing ring 442 is fixedly connected to the sealing block 441 and the connecting head 31, and the sealing ring 442 on the sealing block 441 is movably abutted against the inner wall of the connecting box 411, and the sealing ring 442 on the connecting head 31 is movably abutted against the outer wall.

[0049] Reference Figure 3 The circulating heating component 42 includes a heating wire 421, a heat conducting pipe 422 and an air pump 423. The heating wire 421 is arranged inside the connection box 411. The gas in the ventilation pipe 3 enters the connection box 411. The gas entering the connection box 411 is heated by the heating wire 421. In order to improve the heating effect of the connection box 411, the connection box 411 is provided with an insulation box 45 on the outside, and a vacuum cavity is formed between the insulation box 45 and the connection box 411 to reduce the heat loss of the connection box 411.

[0050] One end of the heat pipe 422 is fixedly connected to the drying box 2 and communicated with the interior of the drying box 2. The other end of the heat pipe 422 is connected to the waste heat recovery device 1. The vacuum pump 423 is fixedly installed on the heat pipe 422. After the drying and dehydration of the phosphogypsum is completed, the vacuum pump 423 is started, and the heat pipe 422 can transport the heat in the drying box 2 to the waste heat recovery device 1 again for reuse.

[0051] The embodiment of the present application discloses a method for a system equipment for dehydrating and recycling waste heat from calcining modified phosphogypsum.

[0052] A method for recycling waste heat dehydration system equipment for calcining modified phosphogypsum, comprising the following steps:

[0053] Step 1: Connect the ventilation pipe 3 and the connection box 411, insert the plug block 312 on the connector 31 into the plug groove 4412 on the blocking block 441, rotate the connector 31 to thread the connecting hole 4111, so that the sealing ring 442 on the connector 31 abuts against the outer wall of the connection box 411, and the plug block 312 drives the blocking block 441 to rotate, and the blocking block 441 moves toward the inside of the connection box 411, so that the connecting hole 4411 on the blocking block 441 is connected with the inside of the connection box 411, so that the connection box 411 is connected with the ventilation pipe 3;

[0054] Step 2: introducing waste heat, and injecting the collected heat into the connection box 411 through the ventilation pipe 3 by the waste heat recovery device 1;

[0055] Step 3: The electric heating wire 421 is energized to further heat the heat introduced into the connection box 411 by the waste heat recovery device 1, and then enters the drying box 2 through the guide pipe 431;

[0056] Step 4: Stirring the phosphogypsum in the drying box 2 to make the phosphogypsum heated evenly;

[0057] Step 5: After the drying is completed, the vacuum pump 423 is started to inject the heat in the drying box 2 into the waste heat recovery device 1 for reuse.

[0058] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A device for dehydrating and recycling waste heat from calcined modified phosphogypsum, comprising a waste heat recovery device (1), a drying box (2), and a vent pipe (3) for passing heat in the waste heat recovery device (1) into the drying box (2). Features: The drying box (2) is provided with a heating mechanism (4). The heating mechanism (4) comprises a connection assembly (41), the connection assembly (41) comprises a connection box (411) arranged on the drying box (2), and the ventilation pipe (3) is connected to the drying box (2) through the connection box (411); a circulating heating component (42) for heating the gas discharged from the ventilation pipe (3), the circulating heating component (42) being arranged inside the connection box (411) and used for making the gas blow evenly toward the guide member (43) inside the drying box (2); The connection box (411) is provided with a plurality of communication holes (4111), and the plurality of communication holes (4111) are used to simultaneously connect the connection box (411) to a plurality of ventilation pipes (3) so as to connect a plurality of waste heat recovery devices (1); the ventilation pipes (3) are detachably connected to the communication holes (4111), and the communication holes (4111) are each provided with a blocking assembly (44); The blocking assembly (44) comprises a blocking block (441), wherein the blocking block (441) is threadedly connected to the communicating hole (4111), and a connecting hole (4411) movably connected to the interior of the connecting box (411) is provided on the blocking block (441), and the connecting hole (4411) is connected to the exterior of the connecting box (411); one end of the connecting hole (4411) is connected to the exterior of the connecting box (411), and the other end of the connecting hole (4411) extends to the side wall of the blocking block (441), and the connecting hole (4411) is movably connected to the interior of the connecting box (411) by rotating the blocking block (441), and when the rotating blocking block (441) moves toward the interior of the connecting box (411), the communicating hole (4111) is opened; A connector (31) is provided at one end of the ventilation pipe (3) away from the waste heat recovery device (1), the connector (31) being threadedly connected and adapted to the connecting hole (4111), the connector (31) being provided with an air outlet (311) connected to the ventilation pipe (3), the air outlet (311) being movably connected to the connecting hole (4411); The connector (31) is provided with a plug-in block (312), and the blocking block (441) is provided with a plug-in slot (4412) that is plug-fitted with the plug-in block (312); The plug-in block (312) on the connecting head (31) is inserted into the plug-in groove (4412) on the blocking block (441), and the connecting head (31) is rotated to be threadedly connected with the connecting hole (4111). The plug-in block (312) drives the blocking block (441) to rotate, and the blocking block (441) moves toward the inside of the connecting box (411), so that the connecting hole (4411) on the blocking block (441) is connected with the inside of the connecting box (411), thereby realizing the connection between the connecting box (411) and the ventilation pipe (3).

2. A calcined modified phosphogypsum waste heat dehydration recycling device according to claim 1, Features: The blocking block (441) and the connecting head (31) are both sleeved with a sealing ring (442), and the sealing ring (442) is movably abutted against the inner wall or the outer wall of the connecting box (411).

3. A calcined modified phosphogypsum waste heat dehydration recycling device according to claim 2, Features: The circulating heating component (42) comprises an electric heating wire (421), a heat conducting pipe (422) and an air pump (423); the electric heating wire (421) is arranged inside the connection box (411); one end of the heat conducting pipe (422) is connected to the drying box (2); the other end of the heat conducting pipe (422) is connected to the waste heat recovery device (1); and the air pump (423) is arranged on the heat conducting pipe (422).

4. A calcined modified phosphogypsum waste heat dehydration recycling device according to claim 3, Features: The flow guide member (43) comprises a flow guide pipe (431), the flow guide pipe (431) being arranged on the inner wall of the drying box (2), the flow guide pipe (431) being provided with a plurality of flow guide holes (4311) facing the bottom of the drying box (2), and one end of the flow guide pipe (431) being connected to the connection box (411).

5. The device for recycling waste heat dehydration of calcined modified phosphogypsum according to claim 1, Features: A heat insulation box (45) is arranged outside the connection box (411), and a vacuum cavity is provided between the heat insulation box (45) and the connection box (411).

6. A method for dehydrating and recycling calcined modified phosphogypsum waste heat using the calcined modified phosphogypsum waste heat dehydration recycling device as claimed in claim 4, It is characterized in that The steps include: Step 1: Connect the ventilation pipe (3) and the connection box (411), insert the plug-in block (312) on the connection head (31) into the plug-in groove (4412) on the blocking block (441), rotate the connection head (31) and thread it into the connecting hole (4111), so that the sealing ring (442) on the connection head (31) abuts against the outer wall of the connection box (411), the plug-in block (312) drives the blocking block (441) to rotate, and the blocking block (441) moves toward the inside of the connection box (411), so that the connecting hole (4411) on the blocking block (441) is connected to the inside of the connection box (411), thereby realizing the connection between the connection box (411) and the ventilation pipe (3); Step 2: introducing waste heat, and injecting the collected heat through the waste heat recovery device (1) into the connection box (411) through the ventilation pipe (3); Step 3: The electric heating wire (421) is energized to further heat the heat introduced into the connection box (411) by the waste heat recovery device (1), and then the heat enters the drying box (2) through the guide pipe (431); Step 4: stirring the phosphogypsum in the drying box (2) so that the phosphogypsum is heated evenly; Step 5: After the drying is completed, the vacuum pump (423) is started to inject the heat in the drying box (2) into the waste heat recovery device (1) for reuse.

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