Phosphogypsum calcination system waste heat utilization equipment and process

Abstract

The application relates to a phosphogypsum calcination system waste heat utilization equipment and process, belonging to the phosphogypsum processing field, comprising: a calcination furnace for calcining phosphogypsum and a drying furnace for drying sludge arranged on one side of the calcination furnace, wherein the drying furnace is connected with an exhaust pipe of the calcination furnace, in use, the smoke in the calcination furnace is filtered and introduced into the drying furnace, the heat of the smoke is utilized to carry out dewatering treatment on the sludge, the time and cost of sludge treatment are reduced, the production and development of enterprises are beneficial, the heat in the smoke is recycled, energy saving and environmental protection are realized, and the concept of sustainable development is matched.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of phosphogypsum processing, in particular to a phosphogypsum calcination system waste heat utilization equipment. BACKGROUND

[0002] Phosphogypsum is mainly gray-black and gray-white, with a particle diameter of 5-50um and a crystallization water content of 20%-25%. Phosphogypsum is a solid waste produced in the wet-process phosphoric acid process, and its main component is calcium sulfate dihydrate, and the secondary components are incompletely decomposed phosphate rock, residual phosphoric acid, fluoride, acid-insoluble substances, organic matter, etc., among which the presence of fluoride and organic matter has the greatest impact on the resource utilization of phosphogypsum. The random discharge and accumulation of phosphogypsum have seriously damaged the ecological environment, not only polluting groundwater resources, but also wasting land resources.

[0003] Therefore, the treatment and recycling of phosphogypsum has become an urgent problem. Among them, the technical process of using phosphogypsum to produce building materials is already quite mature, and has good development prospects at home and abroad. The use of phosphogypsum to produce gypsum board, plastering gypsum and other building materials has become one of the ways of comprehensive utilization of phosphogypsum.

[0004] During production, the phosphogypsum is first naturally aired for a period of time to allow the phosphogypsum to naturally age. During the airing process, the phosphorus, fluoride, organic matter and moisture in the phosphogypsum can be greatly reduced. Then the phosphogypsum is placed in a calcination furnace for high-temperature calcination. After high-temperature calcination, the eutectic phosphorus in the phosphogypsum is converted into pyrophosphate, and the phosphorus, fluoride and organic impurities are further volatilized and removed. The obtained phosphogypsum has high hardness and strength, and after subsequent cooling and forming processing, it can become a building material.

[0005] During the airing and aging process of the phosphogypsum, a large amount of sludge-like dirt will be precipitated. These sludges contain a large amount of harmful substances such as phosphorus and fluoride, and currently have no actual use. The general treatment method is to add a stabilizer to make the physical and chemical properties of the sludge stable. Then a solidifying agent is added to improve the strength of the sludge. Then the sludge is dehydrated. Finally, it can be landfilled.

[0006] In view of the related art, the following defects exist: When treating the sludge, a large area of site needs to be prepared to evenly spread the sludge on the site to accelerate the reaction rate of the sludge and the chemical reagent. A special treatment equipment also needs to be prepared. The sludge treatment process is time-consuming, high-cost, occupies a large area of site and wastes resources, which seriously restricts the normal production and development of enterprises. SUMMARY

[0007] In order to improve the problem of long sludge treatment time, high cost and resource waste, the present application provides a phosphogypsum calcination system waste heat utilization equipment and process.

[0008] The first aspect of the present application provides a phosphogypsum calcination system waste heat utilization equipment which adopts the following technical scheme:

[0009] The phosphogypsum calcination system waste heat utilization equipment comprises a calcination furnace for calcining phosphogypsum and a drying furnace for drying sludge arranged on one side of the calcination furnace, and the drying furnace is connected in communication with the exhaust pipe of the calcination furnace.

[0010] By adopting the above technical scheme, the flue gas in the calcination furnace is filtered and introduced into the drying furnace, and the heat of the flue gas is used for dewatering treatment of the sludge, thereby reducing the time and cost of sludge treatment, being beneficial to the production and development of enterprises, recycling the heat in the flue gas, being energy-saving and environment-friendly, and being consistent with the concept of sustainable development.

[0011] Optionally, the drying furnace comprises a furnace body and an inlet system, a filtering system, a uniform distribution system, a receiving system and an exhaust pipe arranged on the furnace body, the inlet system is used for conveying the sludge into the furnace body, the uniform distribution system is used for uniformly distributing the sludge in the furnace body, the filtering system is used for screening the sludge powder, the receiving system is used for collecting the sludge powder, and the exhaust pipe is used for discharging the used flue gas in the furnace body.

[0012] By adopting the above technical scheme, the inlet system is used for conveying the sludge into the furnace body, the uniform distribution system is used for uniformly distributing the sludge in the furnace body, so that the sludge is heated more uniformly, and the drying efficiency of the sludge is improved, the filtering system is used for screening the sludge powder and checking the drying degree of the sludge powder, and the receiving system is used for centrally collecting the sludge powder, thereby facilitating subsequent landfill treatment.

[0013] Optionally, the inlet system comprises an inlet pipe arranged on the furnace body, one end of the inlet pipe is arranged in an open manner, the other end of the inlet pipe is connected in communication with the top of the furnace body, and a pump body connected in communication with the inlet pipe is arranged on the inlet pipe.

[0014] By adopting the above technical scheme, the pump body is started, and under the action of the pump body, the sludge passes through the inlet pipe and enters the furnace body, thereby saving time and effort and improving conveying efficiency.

[0015] Optionally, the inlet pipe comprises two first pipe bodies and a second pipe body arranged between the two first pipe bodies, one end of one of the first pipe bodies is arranged in an open manner, the other first pipe body is connected in communication with the top of the furnace body, the pump body is arranged on any one of the first pipe bodies, the second pipe body is slidably connected between the two first pipe bodies along the length direction of the two first pipe bodies, a vibration mechanism for driving the second pipe body to vibrate along the length direction of the first pipe body is arranged on the first pipe body, and the exhaust pipe is connected in communication with the end of the inlet pipe.

[0016] By adopting the technical scheme, the sludge has certain viscosity and is easy to adhere to the inner wall of the feeding pipe. After the sludge is dried, the sludge has high hardness and is easy to cause the feeding pipe to be blocked, thereby affecting the conveying. After each sludge conveying is completed, the first vibrating mechanism drives the second pipe body to vibrate. The flue gas in the exhaust pipe flows back to the feeding pipe, and the sludge on the inner wall of the feeding pipe is dried. Under the action of the suction force of the pump body, the possibility of the sludge being hardened on the inner wall of the feeding pipe is reduced, and the possibility of the feeding pipe being blocked is reduced. In addition, the second pipe body slides along the length direction of the first pipe body, and the service life of the second pipe body is not greatly affected.

[0017] Optionally, the vibrating mechanism comprises a first motor arranged on one side of the second pipe body, a first cam is arranged on an output shaft of the first motor, a first protrusion is arranged on a side wall of the second pipe body and is in intermittent abutment with the first cam, and a first spring is arranged at each end of the second pipe body and is connected to the first pipe body at an end away from the second pipe body.

[0018] By adopting the technical scheme, the first motor drives the first cam to rotate. When the first cam is in contact with the first protrusion, the second pipe body slides towards the first pipe body, one of the first springs is in a stretched state, and the other first spring is in a compressed state. With the rotation of the first cam, when the first cam is separated from the first protrusion, the second pipe body is reset under the action of the restoring force of the two first springs. In this way, the second pipe body vibrates, the structure is simple, the vibration amplitude is large, and the vibration effect is good.

[0019] Optionally, the filter system comprises a filter plate arranged in the furnace body.

[0020] By adopting the technical scheme, the filter plate screens the sludge powder to check the drying degree of the sludge powder, the installation is convenient, and the cost is low.

[0021] Optionally, the uniform material system comprises a second motor arranged at the top of the furnace body, an output shaft of the second motor penetrates into the furnace body, a first stirring blade and a second stirring blade are arranged on the output shaft of the second motor, the first stirring blade is located at the top of the furnace body, and the second stirring blade abuts against the top of the filter plate.

[0022] By adopting the technical scheme, the second motor simultaneously drives the first stirring blade and the second stirring blade to rotate, which is energy-saving and environment-friendly and is consistent with the concept of sustainable development. The first stirring blade stirs the sludge just entering the furnace body, so that the sludge falls more uniformly. The second stirring blade stirs the sludge falling on the filter plate, so that the sludge is spread more uniformly, thereby increasing the contact area of the sludge and the flue gas and improving the processing efficiency of the sludge.

[0023] Optionally, the filter plate is radially slidably connected to the furnace body, a second cam is arranged on the output shaft of the second motor, a plurality of second protrusions are arranged on the circumferential side of the filter plate and located around the second cam, the second cam intermittently abuts against the plurality of second protrusions, and a plurality of second springs are arranged on the circumferential side of the filter plate and connected to the inner wall of the furnace body.

[0024] By adopting the above technical scheme, the second motor drives the second cam to rotate, the second cam intermittently abuts against the plurality of second protrusions, when the second cam abuts against the second protrusion, the filter plate slides radially along the furnace body, and the plurality of second springs are stretched or compressed; when the second cam is separated from the second protrusion, the filter plate is reset under the restoring force of the plurality of second springs, and the filter plate vibrates in this way, thereby driving the sludge on the filter plate to vibrate, further increasing the contact area of the sludge and the flue gas, and improving the treatment efficiency of the sludge; the second motor can simultaneously drive the first stirring blade to rotate, the second stirring blade to rotate and the filter plate to vibrate, which is energy-saving and environmentally friendly and consistent with the concept of sustainable development.

[0025] Optionally, the material receiving system comprises a discharge pipe arranged at the bottom of the furnace body, an electromagnet connected to a power supply is arranged at the bottom of the discharge pipe, a conveying belt is arranged below the discharge pipe, a plurality of material receiving barrels are arranged on the conveying belt along the conveying direction of the conveying belt, and a material receiving pipe is slidably connected to the top of each material receiving barrel and has a diameter matching that of the discharge pipe.

[0026] By adopting the above technical scheme, the plurality of material receiving barrels are intermittently moved by the conveying belt, the electromagnet is powered when the material receiving pipe is aligned with the discharge pipe, the material receiving pipe is raised under the attraction of the electromagnet, the material receiving pipe and the discharge pipe are adsorbed together, the electromagnet is powered off after the loading is completed, the material receiving pipe and the discharge pipe are separated, and the next material receiving barrel is continuously loaded.

[0027] In a second aspect, the application provides a phosphogypsum calcination system waste heat utilization process, comprising the following steps:

[0028] S1: The smoke pipe introduces the flue gas in the calcination furnace into the furnace body.

[0029] S2: The feeding system conveys the sludge into the furnace body.

[0030] S3: The material uniformizing system uniformly mixes the sludge in the furnace body.

[0031] S4: The material filtering system screens the sludge powder.

[0032] S5: The material receiving system collects the sludge powder.

[0033] In summary, the application has the following beneficial effects:

[0034] The sludge is dewatered by the flue gas generated in the calcining furnace, which reduces the time and cost of sludge treatment, is beneficial to the production and development of enterprises, recycles the heat in the flue gas, saves energy and protects the environment, and is consistent with the concept of sustainable development. BRIEF DESCRIPTION OF DRAWINGS

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

[0036] Figure 2 is an enlarged view of A in the embodiment of the present application Figure 1

[0037] Figure 3 is a sectional view of the overall structure of the drying oven in the embodiment of the present application.

[0038] BRIEF DESCRIPTION OF DRAWINGS:

[0039] 1, calcining furnace; 21, furnace body; 22, exhaust pipe; 3, smoke exhaust pipe; 41, pump body; 42, first pipe body; 43, second pipe body; 44, first motor; 45, first cam; 46, first cam block; 47, first spring; 5, filter plate; 6, second motor; 61, first stirring blade; 62, second stirring blade; 63, second cam; 64, second cam block; 65, second spring; 7, discharge pipe; 71, electromagnet; 72, conveying belt; 73, receiving bucket; 74, receiving pipe; 81, air inlet pipe; 82, hose; 83, rotary spray head; 84, flow guide pipe; 85, valve; 86, annular groove; 87, electromagnetic valve. DETAILED DESCRIPTION

[0040] The present application will be further described in detail below with reference to the accompanying drawings.

[0041] The present embodiment is a phosphogypsum calcining system waste heat utilization equipment, referring to Figure 1 , comprising a calcining furnace 1 for calcining phosphogypsum and a drying furnace installed on one side of the calcining furnace 1 for drying sludge. The drying furnace comprises a furnace body 21 and a feeding system, a filtering system, a uniformizing system, a receiving system, an air inlet pipe 81 and an exhaust pipe 22 arranged on the furnace body 21. One end of the air inlet pipe 81 is in communication with the smoke exhaust pipe 3 of the calcining furnace 1, and the other end of the air inlet pipe 81 is connected to the top of the furnace body 21.

[0042] During processing, the flue gas with heat in the calcining furnace 1 enters the furnace body 21 in sequence after passing through the smoke exhaust pipe 3 and the air inlet pipe 81. The flue gas has been purified in the low-temperature section of the smoke exhaust pipe 3, and the flue gas is discharged through the exhaust pipe 22 after staying in the furnace body 21 for a period of time.

[0043] ​The feeding system transports the purified sludge into the furnace body 21. The uniform feeding system uniformly distributes the sludge in the furnace body 21, so that the sludge is more fully contacted with the flue gas, the drying efficiency is improved, and the sludge is dried into sludge powder by the flue gas. The filtering system screens the sludge powder to check whether the sludge powder meets the burial requirements. The receiving system centrally collects the qualified sludge powder, which is convenient for subsequent burial.

[0044] The flue gas generated in the calcination furnace 1 is waste gas that needs to be directly discharged, and has high heat. The sludge is treated by dehydration using the flue gas, which reduces the time and cost of sludge treatment, and is beneficial to the production and development of enterprises. The heat in the flue gas is recycled and utilized, which is energy-saving and environmentally friendly, and is consistent with the concept of sustainable development.

[0045] The feeding system includes a feeding pipe arranged on the furnace body 21, the feeding pipe includes two first pipe bodies 42 and a second pipe body 43 arranged between the two first pipe bodies 42, the second pipe body 43 is coaxially arranged with the two first pipe bodies 42, the pipe diameter of the second pipe body 43 is smaller than the pipe diameter of the first pipe body 42, and the length of the second pipe body 43 is much greater than the length of the first pipe body 42.

[0046] The end of the first pipe body 42 away from the furnace body 21 is fixedly connected with a hose 82, and a pump body 41 is installed on the first pipe body 42 away from the furnace body 21. The first pipe body 42 close to the furnace body 21 is connected with the top of the furnace body 21, the first pipe body 42 close to the furnace body 21 extends into the furnace body 21, and a rotary jet head 83 is installed at the end of the first pipe body 42 close to the furnace body 21.

[0047] The second pipe body 43 is slidingly connected between the two first pipe bodies 42 along the length direction of the two first pipe bodies 42, a sliding groove is formed in the first pipe body 42 for the second pipe body 43 to slide, and a vibration mechanism is arranged on the first pipe body 42 for driving the second pipe body 43 to vibrate along the length direction of the first pipe body 42. It should be noted that the exhaust pipe 22 is connected with the first pipe body 42 away from the furnace body 21 through a flow guide pipe 84, and a valve 85 is installed on the flow guide pipe 84.

[0048] During processing, the hose 82 is inserted into the sludge to be dehydrated, and the length and direction of the hose 82 can be freely adjusted according to the storage position of the sludge, which has wide application range and high practicability. Under the action of the pump body 41, the sludge sequentially passes through the hose 82, the first pipe body 42, the second pipe body 43, the first pipe body 42, and the rotary jet head 83, and then enters the furnace body 21.

[0049] After the processing is finished, the valve 85 is opened, and the flue gas with residual heat in the exhaust pipe 22 flows back to the feeding pipe through the flow guide pipe 84, drying the sludge adhered to the inner wall of the feeding pipe. At the same time, the vibration mechanism is started, and the second pipe body 43 vibrates under the action of the vibration mechanism, further driving the first pipe body 42 to vibrate, and the sludge adhered to the inner wall of the feeding pipe is shaken off. Under the joint action of the flue gas and the vibration mechanism, the possibility of the feeding pipe being blocked is reduced.

[0050] Referring to Figure 2 The vibration mechanism comprises a first motor 44 mounted on one side of the second pipe body 43, and the output shaft of the first motor 44 is perpendicular to the second pipe body 43. A first cam 45 is fixedly connected to the output shaft of the first motor 44, and a first protrusion 46 that intermittently abuts against the first cam 45 is fixedly connected to the side wall of the second pipe body 43, and the end of the first protrusion 46 is beveled. First springs 47 are fixedly connected to the two ends of the second pipe body 43, and the ends of the first springs 47 away from the second pipe body 43 are fixedly connected to the outer wall of the first pipe body 42.

[0051] After the first motor 44 is started, the first motor 44 drives the first cam 45 to rotate. When the first cam 45 contacts the bevel on the first protrusion 46, the second pipe body 43 slides towards the first pipe body 42, and at this time, one of the first springs 47 is in a compressed state, and the other first spring 47 is in a stretched state. With the rotation of the first cam 45, when the first cam 45 is separated from the first protrusion 46, the second pipe body 43 is reset under the action of the restoring force of the two first springs 47, and thus reciprocates, and the second pipe body 43 vibrates.

[0052] Referring to Figure 3 The uniform material system comprises a second motor 6 mounted on the top of the furnace body 21, and the output shaft of the second motor 6 is vertically downward, and the output shaft of the second motor 6 penetrates into the furnace body 21. A first stirring blade 61 and a second stirring blade 62 are fixedly connected to the output shaft of the second motor 6, the first stirring blade 61 is located at the top of the furnace body 21, the first stirring blade 61 is located below the rotary jet head 83, and the second stirring blade 62 is located at the middle of the furnace body 21.

[0053] The filter material system comprises a filter plate 5 that is slidingly connected to the middle of the furnace body 21 in the radial direction, and an annular groove 86 is formed in the furnace body 21 for the sliding of the filter plate 5. The output shaft of the second motor 6 penetrates through the filter plate 5, the end of the output shaft of the second motor 6 is fixedly connected with a second cam 63, four second protrusions 64 arranged in an array are annularly arranged on the bottom of the filter plate 5 and located on the side of the second cam 63, the side of the second protrusions 64 close to the second cam 63 is beveled, and the second cam 63 intermittently abuts against the four second protrusions 64. Four second springs 65 arranged in an array are annularly arranged on the side of the filter plate 5, and the ends of the second springs 65 away from the filter plate 5 are fixedly connected to the inner wall of the annular groove 86.

[0054] During processing, the second motor 6 simultaneously drives the first stirring blade 61, the second stirring blade 62 and the second cam 63 to rotate. After the rotary nozzle 83 sprays the sludge into the furnace body 21, the sludge is further diffused under the action of the first stirring blade 61, and the contact area between the sludge and the flue gas is further increased. The sludge falls onto the filter plate 5, and the sludge is evenly spread on the filter plate 5 under the action of the second stirring blade 62, further increasing the contact area between the sludge and the flue gas.

[0055] In addition, when the second cam 63 is in contact with the second protrusion 64, the filter plate 5 slides along the radial direction of the furnace body 21, and the four second springs 65 are stretched or compressed. With the rotation of the second cam 63, when the second cam 63 is separated from the second protrusion 64, the filter plate 5 is reset under the action of the restoring force of the four second springs 65. In this way, the filter plate 5 vibrates along the radial direction of the furnace body 21, thereby driving the sludge to vibrate, further increasing the contact area between the sludge and the flue gas.

[0056] After the sludge is dried into sludge powder, the filter plate 5 screens the sludge powder to check whether the sludge powder meets the burial standard. The sludge powder that meets the burial standard continues to fall through the filter plate 5, and the sludge powder that does not meet the burial standard continues to stay on the filter plate 5.

[0057] The material receiving system includes a discharge pipe 7 fixedly connected to the bottom of the furnace body 21 in the axial direction of the furnace body 21, an electromagnetic valve 87 mounted on the discharge pipe 7, and an electromagnet 71 fixedly connected to the bottom of the discharge pipe 7 and connected to a power supply. A conveyor belt 72 is installed on the ground below the discharge pipe 7 and transmits along the radial direction of the furnace body 21. A plurality of arrayed material receiving barrels 73 are placed on the conveyor belt 72 along the conveying direction of the conveyor belt 72, and a material receiving pipe 74 is slidably connected to the top of each material receiving barrel 73 in the axial direction of the material receiving barrel 73. The material receiving pipe 74 is adapted to the pipe diameter of the discharge pipe 7.

[0058] The material receiving barrels 73 move along the conveyor belt 72, and when the material receiving pipe 74 is located directly below the discharge pipe 7, the conveyor belt 72 stops moving. The electromagnet 71 is energized, and under the adsorption action of the electromagnet 71, the material receiving pipe 74 slides into the discharge pipe 7, and the material receiving pipe 74 and the discharge pipe 7 are engaged together. The electromagnetic valve 87 is opened, and the sludge powder that passes through the filter plate 5 falls into the material receiving barrels 73 after passing through the discharge pipe 7 and the material receiving pipe 74 in turn. After the material receiving barrels 73 are filled, the electromagnet 71 is de-energized, the material receiving pipe 74 is separated from the discharge pipe 7, and the conveyor belt 72 continues to move.

[0059] The phosphogypsum calcination system waste heat utilization process disclosed in the embodiments of the present application comprises the following steps:

[0060] S1: The flue gas in the calcination furnace 1 is introduced into the furnace body 21 through the smoke exhaust pipe 3.

[0061] S2: the feeding system transports the sludge into the furnace body 21;

[0062] S3: the uniform system stirs the sludge in the furnace body 21;

[0063] S4: the filtering system screens the sludge powder;

[0064] S5: the receiving system collects the sludge powder.

[0065] The implementation principle of the embodiment is as follows: during processing, the flue gas in the calcining furnace 1 enters the furnace body 21 through the flue gas discharge pipe 3 and the air inlet pipe 81, and the flue gas is discharged through the air outlet pipe 22 after heating the sludge in the furnace body 21. Under the action of the pump body 41, the sludge enters the furnace body 21 after passing through the hose 82, the feeding pipe and the rotary spray head 83 in turn. Under the action of the first stirring blade 61, the sludge is further diffused.

[0066] The sludge falls on the filter plate 5, and under the action of the vibration of the filter plate 5 and the second stirring blade 62, the sludge is evenly spread on the filter plate 5. After being dried, the sludge becomes sludge powder, and the filter plate 5 screens the sludge powder, and the qualified sludge powder falls after passing through the filter plate 5.

[0067] The receiving barrel 73 moves with the conveying belt 72, and when the receiving pipe 74 is aligned with the discharging pipe 7, the receiving pipe 74 and the discharging pipe 7 are engaged together under the action of the electromagnet 71. The electromagnetic valve 87 is opened, and the falling sludge powder falls into the receiving barrel 73 after passing through the discharging pipe 7 and the receiving pipe 74.

[0068] After the receiving barrel 73 is filled, the conveying belt 72 is started to continue to fill the next receiving barrel 73. After processing, the valve 85 is opened, and the flue gas flows back to the feeding pipe. Under the action of the flue gas and the vibration of the feeding pipe, the possibility of clogging of the feeding pipe is reduced.

[0069] The sludge is treated by dehydration by using the flue gas in the calcining furnace 1, which reduces the time and cost of sludge treatment, and is beneficial to the production and development of enterprises. The heat in the flue gas is recycled and utilized, which is energy-saving and environmentally friendly, and is consistent with the concept of sustainable development.

[0070] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A phosphogypsum calcination system waste heat utilization equipment, characterized in that, The utility model relates to a calcining furnace (1) for calcining phosphogypsum and a drying furnace for drying sludge arranged on one side of the calcining furnace (1), wherein the drying furnace is connected with the exhaust pipe (3) of the calcining furnace (1); the drying furnace comprises a furnace body (21) and a feeding system arranged on the furnace body (21), wherein the feeding system delivers sludge into the furnace body (21). The feeding system comprises a feeding pipe arranged on the furnace body (21), wherein one end of the feeding pipe is arranged in an open manner, the other end of the feeding pipe is connected with the top of the furnace body (21), and a pump body (41) connected with the feeding pipe is arranged on the feeding pipe; the feeding pipe comprises two first pipe bodies (42) and a second pipe body (43) arranged between the two first pipe bodies (42), one end of one of the first pipe bodies (42) is arranged in an open manner, the other first pipe body (42) is connected with the top of the furnace body (21), the pump body (41) is arranged on any one of the first pipe bodies (42), the second pipe body (43) is slidingly connected between the two first pipe bodies (42) along the length direction of the two first pipe bodies (42), and a vibration mechanism for driving the second pipe body (43) to vibrate along the length direction of the first pipe body (42) is arranged on the first pipe body (42); the vibration mechanism comprises a first motor (44) arranged on one side of the second pipe body (43), a first cam (45) arranged on the output shaft of the first motor (44), a first protrusion (46) arranged on the side wall of the second pipe body (43) and intermittently abutting against the first cam (45), and a first spring (47) arranged on the two ends of the second pipe body (43) and connected with the first pipe body (42) away from the second pipe body (43). The drying furnace further comprises a filtering system, a uniform distribution system, a receiving system and an exhaust pipe (22) arranged on the furnace body (21), wherein the uniform distribution system makes the sludge uniformly distributed in the furnace body (21), the filtering system screens the sludge powder, the receiving system collects the sludge powder, and the exhaust pipe (22) discharges the used flue gas in the furnace body (21).

2. The phosphogypsum calcination system waste heat utilization equipment according to claim 1, characterized in that: The exhaust pipe (22) is connected with the end of the feeding pipe.

3. The phosphogypsum calcination system waste heat utilization equipment according to claim 2, characterized in that: The filtering system comprises a filter plate (5) arranged in the furnace body (21).

4. The phosphogypsum calcination system waste heat utilization equipment according to claim 2, characterized in that: The uniform distribution system comprises a second motor (6) arranged on the top of the furnace body (21), wherein the output shaft of the second motor (6) penetrates into the furnace body (21), a first stirring blade (61) and a second stirring blade (62) are arranged on the output shaft of the second motor (6), the first stirring blade (61) is located on the top of the furnace body (21), and the second stirring blade (62) abuts against the top of the filter plate (5).

5. The phosphogypsum calcination system waste heat utilization equipment according to claim 4, characterized in that: ​ 6. The phosphogypsum calcination system waste heat utilization equipment according to claim 5, characterized in that: The filter plate (5) is radially slidingly connected in the furnace body (21), a second cam (63) is arranged on the output shaft of the second motor (6), a plurality of second protrusions (64) are arranged on the circumferential side of the second cam (63), the second cam (63) and the plurality of second protrusions (64) are intermittently in contact, a plurality of second springs (65) are arranged on the circumferential side of the filter plate (5), and the side of the second spring (65) away from the filter plate (5) is connected to the inner wall of the furnace body (21).

7. The phosphogypsum calcination system waste heat utilization equipment according to claim 2, characterized in that: The material receiving system comprises a discharge pipe (7) arranged at the bottom of the furnace body (21), the bottom of the discharge pipe (7) is provided with an electromagnet (71) in communication with a power supply, a conveying belt (72) is arranged below the discharge pipe (7), a plurality of material receiving barrels (73) are arranged on the conveying belt (72) along the conveying direction of the conveying belt (72), a material receiving pipe (74) is slidingly connected to the top of the material receiving barrel (73), and the diameter of the material receiving pipe (74) is matched with that of the discharge pipe (7).

8. A process for utilizing waste heat of a phosphogypsum calcining system, using a phosphogypsum calcining system waste heat utilization device according to any one of claims 2-7, characterized in that, The method comprises the following steps: S1: The smoke pipe (3) introduces the flue gas in the calcination furnace (1) into the furnace body (21); S2: The feeding system conveys the sludge into the furnace body (21); S3: The uniform material system uniformly mixes the sludge in the furnace body (21); S4: The filter material system screens the sludge powder; S5: The material receiving system collects the sludge powder.

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