Heat recovery system of firing equipment

Abstract

The invention discloses a heat recovery system of firing equipment. The heat recovery system comprises a furnace body, a conveying mechanism, a smoke return pipeline and a waste heat mechanism. A drying position, a preheating position, a firing position and a blanking position are arranged in the furnace body; the conveying mechanism is arranged in the furnace body and can be used for conveying the materials at the drying position to the discharging position through the preheating position and the firing position in sequence; the smoke return pipeline is provided with a smoke inlet port located in the firing position and smoke outlet ports located in the drying position and the preheating position respectively. The waste heat mechanism comprises a backheating cover, a backheating pipe and a backheating fan, the backheating cover is arranged at the discharging position, an opening faces the materials located at the discharging position, one end of the backheating pipe communicates with the backheating cover, and the other end of the backheating pipe is located at the drying position. According to the scheme, multi-stage heat recovery can be achieved, high-temperature flue gas and waste heat of finished products are fully utilized, the waste heat recovery rate is increased, the production cost can be saved, the flow direction and the number of waste heat media are flexibly adjusted, directional waste heat utilization is achieved, and high-temperature scalding caused by finished product materials is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of sintering equipment, and in particular to a heat recovery system of sintering equipment. Background Art

[0002] In the past two years, a new integrated mesh-belt firing equipment has been used for the drying and firing of materials. The drying and firing units are integrated into a single design, saving floor space and investment.

[0003] For example, patent CN203518561U discloses a calcining device for sintering honeycomb catalysts, which includes a heating section, a sintering section and a cooling section; and the mesh belt passes through the furnace body of the calcining furnace; a plurality of heaters are arranged in the heating section and the sintering section; the exhaust unit is connected to the heating section and the sintering section; the cooling unit is connected to the cooling section, which can achieve uniform temperature control, smaller temperature difference, and smooth temperature curve, so as to achieve the sintering curve process of the product, effectively reduce the calcination energy consumption of the honeycomb catalyst, ensure the sintering quality of the product, and improve the sintering qualification rate of the product.

[0004] However, the drying unit and the sintering unit in the prior art still need to consume a large amount of natural gas or combustible materials as a heat source supplement, and the operating cost is high. The reason is that the waste heat in the production process is not fully recovered and utilized. Summary of the invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies and propose a heat recovery system for sintering equipment to solve the technical problem that the sintering equipment in the prior art does not fully recycle the waste heat in the production process, resulting in high operating costs.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: The present invention provides a heat recovery system for sintering equipment, comprising: The furnace body is equipped with drying position, preheating position, firing position and material unloading position; A conveying mechanism is disposed in the furnace body and is capable of conveying the material in the drying position to the unloading position via the preheating position and the sintering position in sequence; A smoke return pipeline has a smoke inlet port located at the firing position and smoke outlet ports located at the drying position and the preheating position respectively; and The waste heat mechanism comprises a heat recovery hood, a heat recovery pipe and a heat recovery fan. The heat recovery hood is arranged at the material unloading position and its opening faces the material located at the material unloading position. One end of the heat recovery pipe is connected to the heat recovery hood and the other end is located at the drying position. The air outlet of the heat recovery fan is located at a side of the material unloading position away from the heat recovery hood.

[0007] In some embodiments, the preheating position, the sintering position and the material unloading position are on the same horizontal plane and are arranged in sequence; The drying position is arranged above the material unloading position.

[0008] In some embodiments, the conveying mechanism includes a feeding conveyor belt and a firing conveyor belt, one end of the feeding conveyor belt is located at the drying position, and the other end extends to above the preheating position. The firing conveyor belt is arranged between the preheating position, the firing position and the unloading position, and can receive the material transported by the feeding conveyor belt to above the preheating position and transfer it to the unloading position.

[0009] In some embodiments, the feeding conveyor belt and the sintering conveyor belt are respectively provided with air holes in the up and down directions; The heat recovery hood is located above the firing conveyor belt and opens toward the firing conveyor belt. The air outlet of the heat recovery fan is located on a side of the firing conveyor belt away from the heat recovery hood. The end of the heat recovery pipe away from the heat recovery hood is located below the feeding conveyor belt.

[0010] In some embodiments, the upper layer and the lower layer of the firing conveyor belt are spaced apart to form a mounting gap; The residual heat mechanism also includes an air guide hood arranged at the unloading position, the air guide hood is arranged in the installation gap, and its opening faces the upper layer of the sintering conveyor belt and corresponds to the heat recovery hood, wherein the air outlet of the heat recovery blower is connected to the air guide hood.

[0011] In some embodiments, the feed conveyor belts are provided in multiple groups, and the multiple groups of feed conveyor belts are arranged in sequence at intervals in the up and down directions, and the starting end of the upper feed conveyor belt is the end of the adjacent lower feed conveyor belt, wherein the end of the bottom layer of the feed conveyor belt close to the preheating position is its end.

[0012] In some embodiments, the smoke return pipeline includes a smoke inlet pipe, a smoke inlet fan, a smoke inlet valve, a plurality of smoke outlet pipes and a plurality of smoke outlet valves, one end of the smoke inlet pipe is located at the burning position, the smoke inlet fan and the smoke inlet valve are arranged on the smoke inlet pipe, a plurality of the smoke outlet pipes are respectively connected to the smoke inlet pipe, and a plurality of the smoke outlet valves are respectively arranged on a plurality of the smoke outlet pipes, the outlet end of at least one of the smoke outlet pipes is located at the preheating position, and the outlet end of at least one of the smoke outlet pipes is located at the drying position; Wherein, the smoke inlet port is located at one end of the smoke inlet pipe close to the firing position, and the smoke outlet port is located at one end of the corresponding smoke outlet pipe close to the preheating position and the drying position.

[0013] In some embodiments, a plurality of smoke outlet pipes connected to the preheating position are provided to form a preheating smoke pipe, and outlet ends of the plurality of preheating smoke pipes are spaced apart in a direction close to the firing position.

[0014] In some embodiments, the smoke outlet pipe connected to the drying position is a drying smoke pipe, and the heat recovery system of the firing equipment also includes an air duct and an air intake fan. The air duct is connected to the drying smoke pipe, and the air intake fan is arranged in the air duct.

[0015] In some embodiments, the heat recovery system of the sintering equipment further includes a smoke exhaust pipe and a smoke exhaust fan, wherein the smoke exhaust pipe is connected to the interior of the furnace body and is located at the drying position, and the smoke exhaust fan is arranged on the smoke exhaust pipe; and / or, The waste heat mechanism is provided with a plurality of groups, and the plurality of groups of waste heat mechanism are arranged at intervals along the material conveying direction.

[0016] Compared with the prior art, in the heat recovery system of the firing equipment provided by the present invention, the high-temperature flue gas generated by the firing position can be transported to the drying position and the preheating position respectively through the return smoke pipeline, so that the high-temperature flue gas of the firing position can be used to dry the materials entering the furnace body at the drying position, and the materials transported to the firing position can be preheated at the preheating position; at the same time, the return air fan can be used to blow air to the fired materials at the lower material position to recover the heat of the fired materials, and transport them to the drying position through the return air hood and the return air duct to dry the materials. In this way, this scheme can achieve multi-stage heat recovery, make full use of the waste heat of high-temperature flue gas and finished products, improve the waste heat recovery rate, and save production costs; and the multi-mode and multi-channel waste heat recovery path can flexibly adjust the flow direction and quantity of the waste heat medium according to the different properties of the raw materials and different control requirements, so as to realize directional waste heat utilization; in addition, the temperature of the product coming out of the high-temperature zone of the firing position is close to 600-700℃. If it is directly transported to the outside world, it will cause certain safety risks. After cooling heat recovery, the product temperature is reduced, avoiding the risk of high-temperature burns. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of a heat recovery system for a sintering device provided in an embodiment of the present invention; Figure 2 yes Figure 1 Schematic diagram of the waste heat mechanism in the heat recovery system of the sintering equipment; Figure 3 yes Figure 1 Schematic diagram of the preheating station of the heat recovery system of the firing equipment; Figure 4 yes Figure 1 Schematic diagram of the central smoke return pipe and exhaust pipe; Figure 5 yes Figure 1 A partial schematic diagram of the middle firing position.

[0018] Description of reference numerals: 1. Furnace body; 11. Drying position; 12. Preheating position; 13. Firing position; 14. Unloading position; 2. Conveying mechanism; 21. Feeding conveyor belt; 22. Firing conveyor belt; 22a. Installation gap; 3. Smoke return pipeline; 31. Smoke inlet port; 32. Smoke outlet port; 33. Smoke inlet pipe; 34. Smoke inlet fan; 35. Smoke inlet valve; 36. Smoke outlet pipe; 37. Smoke outlet valve; 38. Preheating smoke pipe; 39. Drying smoke pipe; 4. Waste heat mechanism; 41. Heat recovery hood; 42. Heat recovery pipe; 43. Heat recovery fan; 44. Air guide hood; 5. Air duct; 6. Intake fan; 7. Smoke exhaust pipe; 8. Smoke exhaust fan. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] In order to solve the technical problem that the firing equipment in the prior art does not fully recycle the waste heat in the production process, resulting in high operating costs, the present invention provides a heat recovery system for firing equipment, which can fully utilize the waste heat of high-temperature flue gas and finished products. The waste heat recovery rate is greater than 35%, which can save more than 20% of production costs and improve safety.

[0021] It should be noted that the heat recovery system of the firing equipment described in the present invention is used for but not limited to firing equipment, etc. For the convenience of explanation, in the present invention, only the heat recovery system of the firing equipment is applied to the firing equipment as an example for explanation, and the principle of applying the heat recovery system of the firing equipment to other types of equipment is essentially the same as the principle applied to the firing equipment, which will not be elaborated here.

[0022] See also Figures 1 to 3 , Figures 1 to 31 is a schematic diagram of the structure of a heat recovery system of a firing device in an embodiment of the present invention, wherein the heat recovery system of the firing device comprises a furnace body 1, a conveying mechanism 2, a smoke return pipe 3 and a waste heat mechanism 4; a drying position 11, a preheating position 12, a firing position 13 and a material discharge position 14 are arranged in the furnace body 1; the conveying mechanism 2 is arranged in the furnace body 1, and can transfer the material in the drying position 11 to the material discharge position 14 via the preheating position 12 and the firing position 13 in sequence; the smoke return pipe 3 has a smoke inlet port 31 located at the firing position 13 and smoke outlet ports 32 located at the drying position 11 and the preheating position 12 respectively; the waste heat mechanism 4 comprises a heat recovery cover 41, a heat recovery pipe 42 and a heat recovery fan 43, the heat recovery cover 41 is arranged at the material discharge position 14, and its opening faces the material at the material discharge position 14, one end of the heat recovery pipe 42 is connected to the heat recovery cover 41, and the other end is located at the drying position 11, and the air outlet of the heat recovery fan 43 is located at the side of the material discharge position 14 away from the heat recovery cover 41.

[0023] In the heat recovery system of the firing equipment provided by the present invention, the high-temperature flue gas generated by the firing position 13 can be transported to the drying position 11 and the preheating position 12 respectively through the smoke return pipe 3, so that the high-temperature flue gas of the firing position 13 can be used to dry the material entering the furnace body 1 at the drying position 11, and preheat the material to be transported to the firing position 13 at the preheating position 12; at the same time, the return air fan can be used to blow air to the fired material at the lower material position 14 to recover the heat of the fired material, and transport it to the drying position 11 through the return air hood and the return air duct to dry the material. In this way, this solution can achieve multi-stage heat recovery, make full use of the waste heat of high-temperature flue gas and finished products, improve the waste heat recovery rate, and save production costs; and the multi-mode and multi-channel waste heat recovery path can flexibly adjust the flow direction and quantity of the waste heat medium according to the different properties of the raw materials and different control requirements, so as to achieve directional waste heat utilization; in addition, the temperature of the product coming out of the high-temperature zone of the firing position 13 is close to 600-700℃. If it is directly transported to the outside world, it will cause certain safety risks. After cooling heat recovery, the product temperature is reduced, avoiding the risk of high-temperature burns.

[0024] It should be noted that, in one embodiment, the waste heat mechanism 4 is provided with multiple groups, and the multiple groups of waste heat mechanisms 4 are arranged at intervals along the material conveying direction. That is, in this embodiment, multi-stage recovery of the waste heat of the material can be achieved. Specifically, in this solution, the waste heat mechanism 4 is provided with two groups, and two-stage recovery of the waste heat of the material is achieved.

[0025] In one embodiment, the preheating position 12 , the sintering position 13 and the material unloading position 14 are on the same horizontal plane and are arranged in sequence; the drying position 11 is arranged above the material unloading position 14 at intervals.

[0026] In this embodiment, the preheating position 12, the firing position 13 and the unloading position 14 are arranged in sequence and are on the same horizontal plane. At the same time, the drying position 11 is arranged above the unloading position 14. On the one hand, the overall structure is more compact, and on the other hand, the distance between the unloading position 14 and the drying position 11 can be shortened, so that the heat recovered from the waste heat of the finished product can be quickly transferred to the drying position 11.

[0027] It should be noted that the specific structure of the conveying mechanism 2 is not limited as long as it can realize the sequential transfer of materials between multiple workstations. In one embodiment, the transmission mechanism is configured in the form of a conveying chain and a loading plate; in another embodiment, the transmission mechanism is configured in the form of a conveying lifting vehicle.

[0028] In one embodiment, the conveying mechanism 2 includes a feeding conveyor belt 21 and a firing conveyor belt 22. One end of the feeding conveyor belt 21 is located at the drying position 11, and the other end extends to the top of the preheating position 12. The firing conveyor belt 22 is arranged between the preheating position 12, the firing position 13 and the unloading position 14, and can receive the material transported by the feeding conveyor belt 21 to the top of the preheating position 12 and transfer it to the unloading position 14.

[0029] In this embodiment, the material is transferred between the drying position 11, the preheating position 12, the sintering position 13 and the unloading position 14 by means of a multi-section transmission belt, and the structure is stable and reliable. It should be noted that in this solution, the end of the feeding conveyor belt 21 is the starting end of the sintering conveyor belt 22.

[0030] In one embodiment, the feeding conveyor belt 21 and the firing conveyor belt 22 are respectively provided with air holes in the up and down directions; the heat recovery cover 41 is located above the firing conveyor belt 22, and its opening faces the firing conveyor belt 22, the air outlet of the heat recovery fan 43 is located on the side of the firing conveyor belt 22 away from the heat recovery cover 41, and the end of the heat recovery pipe 42 away from the heat recovery cover 41 is located below the feeding conveyor belt 21.

[0031] In this embodiment, air holes are provided on the feed conveyor belt 21 and the firing conveyor belt 22, that is, the two conveyor belts are provided in the form of mesh belts to facilitate the hot air to pass through. It should be noted that in this solution, the heat recovery pipe 42 and the smoke outlet port 32 located at the drying position 11 are both located at the lower side of the feed conveyor belt 21, and are connected to a corresponding wind plate, so that the smoke can rise and evenly pass through the feed conveyor belt 21.

[0032] In one of the embodiments, the upper layer and the lower layer of the firing conveyor belt 22 are spaced apart to form an installation gap 22a; the waste heat mechanism 4 also includes an air guide hood 44 arranged at the unloading position 14, the air guide hood 44 is arranged at the installation gap 22a, and its opening faces the upper layer of the firing conveyor belt 22 and corresponds to the heat recovery hood 41, wherein the air outlet of the heat recovery fan 43 is connected to the air guide hood 44.

[0033] In this embodiment, an air guide hood 44 is further provided corresponding to the heat recovery cover 41, so that the wind output by the heat recovery blower 43 can be output through the air guide hood 44, thereby expanding the windward surface and ensuring effective transfer of hot air, so as to take away more heat and flow to the heat recovery cover 41, thereby improving the heat recovery efficiency. Specifically, in this solution, the air guide hood 44 is gradually expanded in the direction close to the heat recovery cover 41.

[0034] In one embodiment, a plurality of feed conveyor belts 21 are provided, and the plurality of feed conveyor belts 21 are arranged in sequence and spaced apart in the up-down direction, and the starting end of the upper feed conveyor belt 21 is the end of the adjacent lower feed conveyor belt 21, wherein the end of the bottom layer of feed conveyor belt 21 close to the preheating position 12 is its end.

[0035] In this embodiment, multiple groups of feeding conveyor belts 21 are set to extend the drying journey of the material, thereby improving the dryness of the material, and allowing the material to slowly heat up and improve the quality of the material after drying. It should be noted that there is at least one group of conveyor belts in the drying position 11, and the number of groups can be increased according to the processing requirements. The belts are arranged in layers from top to bottom, and the lower part of the end of the upper belt is the starting end of the next belt, and the material of the upper belt falls at its end onto the starting end of the next belt.

[0036] In one embodiment, see Figure 4 The smoke return pipeline 3 includes a smoke inlet pipe 33, a smoke inlet fan 34, a smoke inlet valve 35, a plurality of smoke outlet pipes 36 and a plurality of smoke outlet valves 37. One end of the smoke inlet pipe 33 is located at the burning position 13. The smoke inlet fan 34 and the smoke inlet valve 35 are arranged on the smoke inlet pipe 33. The plurality of smoke outlet pipes 36 are respectively connected to the smoke inlet pipe 33, and the plurality of smoke outlet valves 37 are respectively arranged on the plurality of smoke outlet pipes 36. The outlet end of at least one smoke outlet pipe 36 is located at the preheating position 12, and the outlet end of at least one smoke outlet pipe 36 is located at the drying position 11; wherein, the smoke inlet port 31 is located at one end of the smoke inlet pipe 33 close to the burning position 13, and the smoke outlet port 32 is located at one end of the corresponding smoke outlet pipe 36 close to the preheating position 12 and the drying position 11.

[0037] In this embodiment, valves are provided on the smoke inlet pipe 33 and the smoke outlet pipe 36 respectively, and the opening of each valve can be flexibly adjusted according to actual needs to improve the utilization rate of smoke heat recovery. In one embodiment, the smoke inlet valve 35 and the smoke outlet valve 37 are both electric valves.

[0038] It should be noted that the heat recovery system can also include an intelligent control system, which includes a controller, a temperature sensor, a humidity sensor, a flow sensor and multiple electric valves. The temperature sensor, humidity sensor, flow sensor, fan and electric valve are respectively connected to the controller, and corresponding intelligent adjustments can be made according to the online feedback from the sensor.

[0039] In one embodiment, a plurality of smoke outlet pipes 36 connected to the preheating position 12 are provided to form a preheating smoke pipe 38 , and outlet ends of the plurality of preheating smoke pipes 38 are spaced apart in a direction close to the burning position 13 .

[0040] In this embodiment, multiple preheating smoke pipes 38 are arranged at intervals along the material conveying direction, so that the air delivery volume of each preheating smoke pipe 38 can be flexibly adjusted according to the temperature at the preheating position 12, which is practical, further preheats and dries the materials entering the furnace, and reduces the energy consumption of the subsequent heating. It should be noted that the preheating position 12 and the firing position 13 are divided into multiple areas along the direction close to the material discharge position 14. In addition, specifically, in this solution, three preheating smoke pipes 38 are provided, so that the high-temperature flue gas can be divided into 1 to 3 routes to enter the preheating position 12.

[0041] In one embodiment, the smoke outlet pipe 36 connected to the drying position 11 is a drying smoke pipe 39, and the heat recovery system of the firing equipment also includes an air duct 5 and an air intake fan 6. The air duct 5 is connected to the drying smoke pipe 39, and the air intake fan 6 is arranged in the air duct 5.

[0042] In this embodiment, the high-temperature flue gas from the firing position 13 is quantitatively extracted by the smoke inlet fan 34 and is divided into two paths to enter the drying position 11 and the preheating position 12. The high-temperature flue gas and the ambient air can be mixed in a certain proportion and then enter the drying position 11, wherein the mixing amount of the ambient air can be controlled by the air inlet fan 6.

[0043] In one embodiment, the heat recovery system of the sintering equipment also includes a smoke exhaust pipe 7 and a smoke exhaust fan 8. The smoke exhaust pipe 7 is connected to the interior of the furnace body 1 and is located at the drying position 11. The smoke exhaust fan 8 is arranged on the smoke exhaust pipe 7.

[0044] In this embodiment, the flue gas after waste heat utilization is finally discharged from the exhaust pipe 7 of the drying position 11 for the next purification treatment. In addition, it should be noted that in this embodiment, two groups of smoke inlet pipes 33 are provided, and correspondingly, two groups of smoke inlet valves 35 and smoke inlet fans 34 are provided respectively. In addition, the smoke inlet fans 34, the air inlet fans 6 and the smoke exhaust fans 8 are variable frequency fans.

[0045] In order to better understand the present invention, the following Figures 1 to 5 The technical solution of the present invention is described in detail: In actual operation, the material is transported to the firing equipment by a conveyor for drying and firing. The temperatures T7 and T8 in the high temperature zones of the firing position 13 are between 600°C and 800°C. The high-temperature flue gas generated is quantitatively sucked out by the variable frequency centrifugal smoke inlet fan 34, and transported to the feed end of the drying position 11 and the preheating position 12 through the preheating smoke pipe 38 and the drying smoke pipe 39 respectively.

[0046] There is an electric valve on the high-temperature flue gas pipeline entering the drying position 11 to control the opening and closing of the pipeline. The high-temperature flue gas after passing through the electric valve is mixed with the ambient air in a certain proportion. The mixing amount of ambient air can be regulated by the variable frequency air intake fan 6. The mixed hot air enters under the conveyor belt of the drying position 11 and is evenly distributed into the drying position 11 through the air equalizing plate.

[0047] The high-temperature flue gas sucked out from the high-temperature zone of the firing position 13 enters the preheating position 12T1~T3 of the firing layer through another route. When entering the preheating position 12, it is divided into three branches. The flue gas volume of each branch can be individually controlled by the opening of the electric valve, which is convenient for flexible adjustment of the temperature of different heating units.

[0048] The products coming out of the high temperature zone of the firing position 13 immediately enter the two-stage air cooling heat recovery device. The first-stage air cooling heat recovery device is composed of a first-stage heat recovery cover 41 and a first-stage heat recovery fan 43, and the second-stage air cooling heat recovery device is composed of a second-stage heat recovery cover 41 and a second-stage heat recovery fan 43. The air cooling heat recovery amount of each stage can be flexibly controlled by the heat recovery fan 43. The cooling air passes upward from the bottom of the conveyor mesh belt, takes away the heat of the product, and then enters the drying position 11.

[0049] The final exhaust smoke of the burning equipment is discharged from the exhaust pipe 7 of the drying position 11, and the exhaust volume can be adjusted by the variable frequency exhaust fan 8, and the exhausted smoke enters the next step of purification device.

[0050] Thus compared with the current technology, the present invention has the following advantages: Low energy consumption: Multi-stage heat recovery fully utilizes the waste heat of high-temperature flue gas and products. The waste heat recovery efficiency is greater than 35%, which can save more than 20% of production costs. Flexibility: Multi-mode and multi-channel waste heat recovery paths can flexibly adjust the flow direction and quantity of waste heat medium according to different raw material properties and control requirements to achieve directional waste heat utilization; Safety: The temperature of the product coming out of the high temperature zone is close to 600℃~700℃. If it is directly transported to the outside, there will be certain safety risks. After two-stage product cooling and heat recovery, the product temperature drops to below 100℃, avoiding the risk of high temperature burns.

[0051] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A heat recovery system for a sintering device, characterized in that: include: The furnace body is equipped with drying position, preheating position, firing position and material unloading position; A conveying mechanism is disposed in the furnace body and is capable of conveying the material in the drying position to the unloading position via the preheating position and the sintering position in sequence; A smoke return pipeline has a smoke inlet port located at the firing position and smoke outlet ports located at the drying position and the preheating position respectively; and The waste heat mechanism comprises a heat recovery hood, a heat recovery pipe and a heat recovery fan. The heat recovery hood is arranged at the material unloading position and its opening faces the material located at the material unloading position. One end of the heat recovery pipe is connected to the heat recovery hood and the other end is located at the drying position. The air outlet of the heat recovery fan is located at a side of the material unloading position away from the heat recovery hood.

2. The heat recovery system for sintering equipment according to claim 1, characterized in that: The preheating position, the sintering position and the material unloading position are on the same horizontal plane and are arranged in sequence; The drying position is arranged above the material unloading position.

3. The heat recovery system for sintering equipment according to claim 2, characterized in that: The conveying mechanism includes a feeding conveyor belt and a firing conveyor belt. One end of the feeding conveyor belt is located at the drying position, and the other end extends to above the preheating position. The firing conveyor belt is arranged between the preheating position, the firing position and the unloading position, and can receive the material transported by the feeding conveyor belt to above the preheating position and transfer it to the unloading position.

4. The heat recovery system for sintering equipment according to claim 3, characterized in that: The feeding conveyor belt and the sintering conveyor belt are respectively provided with air holes in the up and down directions; The heat recovery hood is located above the firing conveyor belt and opens toward the firing conveyor belt. The air outlet of the heat recovery fan is located on a side of the firing conveyor belt away from the heat recovery hood. The end of the heat recovery pipe away from the heat recovery hood is located below the feeding conveyor belt.

5. The heat recovery system for sintering equipment according to claim 4, characterized in that: The upper layer and the lower layer of the sintering conveyor belt are spaced apart to form an installation gap; The residual heat mechanism also includes an air guide hood arranged at the unloading position, the air guide hood is arranged in the installation gap, and its opening faces the upper layer of the sintering conveyor belt and corresponds to the heat recovery hood, wherein the air outlet of the heat recovery blower is connected to the air guide hood.

6. The heat recovery system for sintering equipment according to claim 4, characterized in that: There are multiple groups of feed conveyor belts, which are arranged in sequence at intervals along the up and down directions, and the starting end of the upper feed conveyor belt is the end of the adjacent lower feed conveyor belt, wherein the end of the bottom layer of the feed conveyor belt close to the preheating position is its end.

7. The heat recovery system for sintering equipment according to claim 1, characterized in that: The smoke return pipeline includes a smoke inlet pipe, a smoke inlet fan, a smoke inlet valve, a plurality of smoke outlet pipes and a plurality of smoke outlet valves, one end of the smoke inlet pipe is located at the burning position, the smoke inlet fan and the smoke inlet valve are arranged on the smoke inlet pipe, a plurality of smoke outlet pipes are respectively connected to the smoke inlet pipe, and a plurality of smoke outlet valves are respectively arranged on a plurality of smoke outlet pipes, an outlet end of at least one of the smoke outlet pipes is located at the preheating position, and an outlet end of at least one of the smoke outlet pipes is located at the drying position; Wherein, the smoke inlet port is located at one end of the smoke inlet pipe close to the firing position, and the smoke outlet port is located at one end of the corresponding smoke outlet pipe close to the preheating position and the drying position.

8. The heat recovery system for sintering equipment according to claim 7, characterized in that: A plurality of smoke outlet pipes connected to the preheating position are provided to form a preheating smoke pipe, and outlet ends of the plurality of preheating smoke pipes are arranged at intervals in a direction close to the firing position.

9. The heat recovery system for sintering equipment according to claim 7, characterized in that: The smoke outlet pipe connected to the drying position is a drying smoke pipe. The heat recovery system of the firing equipment also includes an air duct and an air intake fan. The air duct is connected to the drying smoke pipe, and the air intake fan is arranged in the air duct.

10. The heat recovery system for sintering equipment according to claim 1, characterized in that: The heat recovery system of the sintering equipment further includes a smoke exhaust pipe and a smoke exhaust fan, wherein the smoke exhaust pipe is connected to the interior of the furnace body and is located at the drying position, and the smoke exhaust fan is arranged on the smoke exhaust pipe; and / or, The waste heat mechanism is provided with a plurality of groups, and the plurality of groups of waste heat mechanism are arranged at intervals along the material conveying direction.

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