Rotary kiln air inlet mechanism and rotary roasting device

Abstract

The utility model provides a rotary kiln air inlet mechanism and a rotary roasting device. The rotary kiln air inlet mechanism comprises an air inducing pipe, an air heater and a temperature probe. The air inducing pipe is used for being installed on the rotary kiln. The air outlet end of the air inducing pipe is communicated with an air inlet of the rotary kiln, the air inlet end of the air inducing pipe is arranged towards an outer leakage barrel of the rotary kiln, so that heat lost by the outer leakage barrel to the outside can enter the air inducing pipe along with outside air, and the air absorbs the heat and rises to preheat; the air inlet end of the air inducing pipe is communicated with the outside; the air heater is mounted in the air inducing pipe; the temperature probe is mounted on the air inducing pipe; the detection end of the temperature probe extends into the air inducing pipe and is located between the air heater and the air inlet of the rotary kiln, the temperature of air entering the rotary kiln is detected through the temperature probe, the air heater can adjust the power in real time according to a temperature adjusting signal, and it is ensured that the temperature of the air entering the air inlet of the rotary kiln is constant at the decomposition temperature of sulfur impurities.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of electrode material recycling, and particularly relates to a rotary kiln air inlet structure and a rotary roasting device. BACKGROUND

[0002] The waste and old iron phosphate material usually contains a large amount of sulfur impurities. Since the sulfur impurities can reduce the electrical performance of the end product, most manufacturers will use a rotary kiln system such as the one disclosed in Chinese patent document CN217818076U to perform roasting desulfurization treatment on the waste and old iron phosphate material. However, since the sulfur impurities mainly exist in the form of sulfuric acid and sulfate, the rotary kiln needs to be stabilized at a relatively high temperature to complete the decomposition. The temperature of the external air introduced through the air inlet of the above-mentioned rotary kiln system is usually low, which causes the temperature in the kiln to fluctuate after the external air enters the rotary kiln, thereby causing abnormal desulfurization of the waste and old iron phosphate material. CONTENT OF THE UTILITY MODEL

[0003] The purpose of the present disclosure is to overcome the deficiencies in the prior art, and to provide a rotary kiln air inlet structure and a rotary roasting device with stable air inlet temperature and high roasting desulfurization efficiency.

[0004] The purpose of the present disclosure is achieved by the following technical solutions:

[0005] A rotary kiln air inlet structure comprises:

[0006] An air duct is used to be installed on the rotary kiln. The air outlet end of the air duct is communicated with the air inlet of the rotary kiln, and the air inlet end of the air duct is arranged towards the outer leakage cylinder of the rotary kiln. The air inlet end of the air duct is communicated with the outside for introducing external air.

[0007] An air heater is installed in the air duct. The air heater is used to heat the air entering the air duct.

[0008] A temperature probe is installed on the air duct. The detection end of the temperature probe is inserted into the air duct and located between the air heater and the air inlet of the rotary kiln. The temperature probe is used to detect the temperature of the air entering the rotary kiln and feed back a temperature adjustment signal to the air heater to keep the temperature of the air entering the rotary kiln constant.

[0009] In some embodiments, the air duct comprises a wind inlet elbow, a heating middle pipe and an air outlet elbow which are communicated in sequence. The air outlet elbow is used to be communicated with the air inlet of the rotary kiln, and the air heater is installed in the heating middle pipe. The air inlet of the wind inlet elbow is arranged towards the outer leakage cylinder of the rotary kiln and is communicated with the outside.

[0010] In some embodiments, the air duct further comprises a rotary joint, the air inlet elbow, the heating middle tube, the air outlet elbow and the rotary joint are sequentially fixedly connected; part of the rotary joint is arranged in the air inlet of the rotary kiln and is rotatably connected with the inner wall of the air inlet; the air outlet elbow is communicated with the inside of the rotary kiln through the rotary joint.

[0011] In some embodiments, the rotary kiln air inlet mechanism further comprises a rotary driver and a gear transmission assembly; the rotary driver is fixedly installed on the rotary kiln, and the power output end of the rotary driver is connected with the rotary joint through the gear transmission assembly.

[0012] In some embodiments, the gear transmission assembly comprises a driving gear and a driven gear; the driving gear is sleeved on the rotating shaft of the rotary driver, the driven gear is sleeved on the outer wall of the rotary joint, and the driving gear is engaged with the driven gear.

[0013] In some embodiments, the rotary kiln air inlet mechanism further comprises a guide support, the guide support comprises a guide slide rail and a support frame body, the support frame body is fixedly arranged on the rotary kiln, and the guide slide rail is fixedly installed on the support frame body; the outer wall of the heating middle tube is slidingly arranged on the guide slide rail.

[0014] In some embodiments, the guide slide rail comprises a track body and a cross beam body; the track body is fixedly connected with the cross beam body and extends in a circular arc shape around the rotary joint to form an extension part; the extension part is fixedly connected with the support frame body through the cross beam body; the outer wall of the heating middle tube is slidingly installed on the track body.

[0015] In some embodiments, a filter screen is arranged at the air inlet of the air inlet elbow; and / or,

[0016] The air duct is sleeved with a heat preservation sleeve.

[0017] A rotary roasting device comprises a rotary kiln, a feeding assembly, an air duct, an air speed meter and a rotary kiln air inlet mechanism according to any one of the above embodiments; the feeding assembly and the air duct are both communicated with the first end of the rotary kiln; the air duct is installed at the second end of the rotary kiln and is communicated with the air inlet of the rotary kiln; the air speed meter is installed on the air duct, and the detection end of the air speed meter extends into the air duct; the air speed meter is used to detect the flow rate of the air entering the rotary kiln and feed a flow rate adjustment signal to the air duct so as to keep the flow rate of the air entering the rotary kiln constant.

[0018] In some embodiments, the rotary roasting device further comprises a tail gas absorption tower and a bag-type dust collector; the bag-type dust collector is arranged between the induced draft fan and the rotary kiln, and the first end of the rotary kiln is communicated with the air inlet of the induced draft fan through the bag-type dust collector; the air outlet of the induced draft fan is communicated with the tail gas absorption tower, and the dust discharge port of the bag-type dust collector is communicated with the feeding assembly.

[0019] Compared with the prior art, the present disclosure has at least the following advantages:

[0020] The rotary kiln air inlet mechanism described above, since the air inlet end of the induced draft pipe is arranged towards the outer leakage cylinder of the rotary kiln and is communicated with the outside, the heat lost by the outer leakage cylinder in the outside can enter the induced draft pipe along with the outside air, and the air absorbs heat to increase the temperature, so as to reduce the temperature difference between the air in the induced draft pipe and the air in the kiln. In addition, the detection end of the temperature probe extending into the induced draft pipe is located between the air heater and the air inlet of the rotary kiln, and the temperature of the air entering the rotary kiln is detected by the temperature probe. When the detected air temperature does not meet the requirements, the temperature probe feeds back a temperature adjustment signal to the air heater, and the air heater can adjust the power in real time according to the temperature adjustment signal, so as to ensure that the air temperature entering the air inlet of the rotary kiln is constant at the decomposition temperature of sulfur impurities, thereby reducing the temperature fluctuation in the kiln caused by the outside air entering the rotary kiln and maintaining the stable progress of the waste iron phosphate material desulfurization process. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present disclosure, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0022] Figure 1 The schematic diagram of the state of the rotary kiln air inlet mechanism of an embodiment of the present disclosure installed on the rotary kiln;

[0023] Figure 2 The cross-sectional structure diagram of the rotary kiln air inlet mechanism shown in Figure 1

[0024] Figure 3 The enlarged view of the part A shown in Figure 1

[0025] Figure 4 The cross-sectional view of the part B1-B2 shown in Figure 1

[0026] Figure 5 The structural schematic diagram of the rotary roasting device of another embodiment of the present disclosure.​​​

[0027] Reference signs:

[0028] 100, air inlet mechanism of rotary kiln;

[0029] 110, air duct; 1110, air inlet elbow; 1101, air inlet; 1111, filter screen; 1120, middle heating pipe; 1130, air outlet elbow; 1140, rotary joint; 1150, rotating driver; 1160, gear transmission assembly; 1161, driving gear; 1162, driven gear; 1170, guide support; 1171, guide slide rail; 1102, track body; 1103, cross beam body; 1172, support frame body; 1180, heat preservation sleeve;

[0030] 120, air heater;

[0031] 130, temperature probe;

[0032] 200, rotary kiln; 201, air inlet; 210, ball bearing; 300, feeding assembly; 400, air blower; 500, air speed meter; 600, tail gas absorption tower; 700, bag-type dust collector. DETAILED DESCRIPTION

[0033] For the purpose of clarity, the present disclosure will be described in greater detail with reference to the accompanying drawings. The preferred embodiments of the present disclosure are shown in the drawings. However, the present disclosure can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the present disclosure to those skilled in the art.

[0034] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. The terms "vertical", "horizontal", "left", "right", and the like as used herein are merely for the purpose of illustration and do not indicate the only orientation of the embodiments.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used in the description of the disclosure herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0036] In order to better understand the technical solutions and beneficial effects of the present disclosure, the present disclosure will be further described in detail below in conjunction with specific embodiments:

[0037] Please refer to Figure 1 The air inlet mechanism 100 of the rotary kiln in one embodiment comprises an air duct 110, an air heater 120 and a temperature probe 130; the air duct 110 is used to be installed on the rotary kiln 200; the air outlet end of the air duct 110 is communicated with the air inlet 201 of the rotary kiln 200, and the air inlet end of the air duct 110 is arranged towards the outer leakage cylinder of the rotary kiln 200; the air inlet end of the air duct 110 is communicated with the outside, which is used to guide the air from the outside; the air heater 120 is installed in the air duct 110; the air heater 120 is used to heat the air entering the air duct 110; the temperature probe 130 is installed on the air duct 110; the detection end of the temperature probe 130 extends into the air duct 110 and is located between the air heater 120 and the air inlet 201 of the rotary kiln 200; the temperature probe 130 is used to detect the temperature of the air entering the rotary kiln 200 and feed back the temperature adjustment signal to the air heater 120, so as to keep the temperature of the air entering the rotary kiln 200 constant.

[0038] It can be understood that, since the air inlet end of the air duct 110 is arranged towards the outer leakage cylinder of the rotary kiln 200 and is communicated with the outside, the heat lost by the outer leakage cylinder in the outside can enter the air duct 110 with the air from the outside, and the air absorbs the heat to increase the temperature, so as to reduce the temperature difference between the air in the air duct 110 and the air in the kiln. Since the detection end of the temperature probe 130 extending into the air duct 110 is located between the air heater 120 and the air inlet 201 of the rotary kiln 200, the temperature of the air entering the rotary kiln 200 is detected by the temperature probe 130, and when the detected air temperature does not meet the requirements, the temperature probe 130 feeds back the temperature adjustment signal to the air heater 120, and the air heater 120 can adjust the power in real time according to the temperature adjustment signal, so as to keep the temperature of the air entering the air inlet 201 of the rotary kiln 200 constant at the decomposition temperature of sulfur impurities, thereby reducing the temperature fluctuation in the kiln caused by the air from the outside entering the rotary kiln 200 and maintaining the stable progress of the desulfurization process of the waste iron phosphate material.

[0039] It should be particularly pointed out that the method of detecting the air temperature by the temperature probe 130, the method of feeding back the temperature adjustment signal to the air heater 120 by the temperature probe 130, and the method of adjusting the power by the air heater 120 according to the temperature adjustment signal all belong to the prior art and are not within the protection scope of the present disclosure. The present disclosure only protects the elements of the air inlet mechanism 100 of the rotary kiln and their positions and connection relationships. In some embodiments, the temperature probe 130 is electrically connected to the air heater 120, but of course, other selections can also be made by those skilled in the art.

[0040] In one of the embodiments, the air heater 120 can be a heating resistance wire or the like, and of course, the skilled in the art can also make other selections. Specifically, the heating resistance wire is a 310S stainless steel heating wire or a 321 stainless steel heating wire, which not only has stronger corrosion resistance, but also will not introduce magnetic foreign matters due to abrasion.

[0041] Please refer to Figure 1 and Figure 2 In some of the embodiments, the air duct 110 comprises a wind inlet elbow 1110, a heating middle pipe 1120 and a wind outlet elbow 1130 which are sequentially communicated; the wind outlet elbow 1130 is used for being communicated with the air inlet 201 of the rotary kiln 200, and the air heater 120 is installed in the heating middle pipe 1120; the air inlet 1101 of the wind inlet elbow 1110 is used for being arranged towards the outer leakage cylinder of the rotary kiln 200 and being communicated with the outside. It can be understood that, since the wind inlet elbow 1110, the heating middle pipe 1120 and the wind outlet elbow 1130 are sequentially arranged, the air flow rate entering or discharging from the heating middle pipe 1120 can be effectively reduced through the bending position of the wind inlet elbow 1110 and the bending position of the wind outlet elbow 1130, and the air heater 120 is installed in the heating middle pipe 1120, so that the air heater 120 can be more fully contacted and heat exchanged with the air in the heating middle pipe 1120, and the air heating efficiency is improved.

[0042] Please refer to Figure 2 and Figure 3 In some of the embodiments, the air duct 110 further comprises a rotary joint 1140, and the wind inlet elbow 1110, the heating middle pipe 1120, the wind outlet elbow 1130 and the rotary joint 1140 are sequentially fixedly connected; part of the rotary joint 1140 is arranged in the air inlet 201 of the rotary kiln 200 and is rotatably connected with the inner wall of the air inlet 201; the wind outlet elbow 1130 is communicated with the inside of the rotary kiln 200 through the rotary joint 1140. It can be understood that, since the wind inlet elbow 1110, the heating middle pipe 1120, the wind outlet elbow 1130 and the rotary joint 1140 are sequentially fixedly connected, part of the rotary joint 1140 is rotatably connected with the inner wall of the air inlet 201, and the rotary joint 1140 is rotated relative to the inner wall of the air inlet 201, so that the wind inlet elbow 1110 can be close to or away from the high-temperature environment outside the outer leakage cylinder, which not only can adjust the recovery rate of the heat loss of the outer leakage cylinder by the wind inlet elbow 1110, but also can facilitate the maintenance or cleaning of the wind inlet elbow 1110 by the operator more safely. Specifically, the air inlet 201 of the rotary kiln 200 is provided with a ball bearing 210, and the outer ring of the ball bearing 210 is fixedly connected with the inner wall of the air inlet 201; part of the rotary joint 1140 is arranged in the inner ring of the ball bearing 210 and is fixedly connected with the inner ring of the ball bearing 210.

[0043] Please refer to Figure 1 andFigure 3 In some embodiments, the rotary kiln air inlet mechanism 100 further comprises a rotary driver 1150 and a gear transmission assembly 1160; the rotary driver 1150 is fixedly installed on the rotary kiln 200, and the power output end of the rotary driver 1150 is connected to the rotary joint 1140 through the gear transmission assembly 1160. It can be understood that since the power output end of the rotary driver 1150 is connected to the rotary joint 1140 through the gear transmission assembly 1160, the rotary joint 1140 can be driven by the rotary driver 1150 to automatically control the air duct 110 to swing relative to the rotary kiln 200.

[0044] Please refer to Figure 3 With Figure 4 In some embodiments, the gear transmission assembly 1160 comprises a driving gear 1161 and a driven gear 1162; the driving gear 1161 is sleeved on the rotating shaft of the rotary driver 1150, and the driven gear 1162 is sleeved on the outer wall of the rotary joint 1140, and the driving gear 1161 is engaged with the driven gear 1162. It can be understood that since the driving gear 1161 on the rotating shaft of the rotary driver 1150 is engaged with the driven gear 1162 sleeved on the outer wall of the rotary joint 1140, the rotary driver 1150 drives the driving gear 1161 through the rotating shaft, and the driving gear 1161 drives the rotary joint 1140 to rotate through the driven gear 1162, which can smoothly drive the air duct 110 to swing.

[0045] Please refer to Figure 1 With Figure 2 In some embodiments, the rotary kiln air inlet mechanism 100 further comprises a guide support 1170, which comprises a guide slide rail 1171 and a support frame body 1172; the support frame body 1172 is fixedly arranged on the rotary kiln 200, and the guide slide rail 1171 is fixedly installed on the support frame body 1172; the outer wall of the heating middle tube 1120 is slidingly arranged on the guide slide rail 1171. It can be understood that since the guide slide rail 1171 is fixedly installed on the support frame body 1172 fixedly arranged on the rotary kiln 200, the guide slide rail 1171 can be supported by the support frame body 1172. At the same time, since the outer wall of the heating middle tube 1120 is slidingly arranged on the guide slide rail 1171, the guide slide rail 1171 can guide the movement of the heating middle tube 1120 to further improve the stability of the air duct 110 swinging.

[0046] Please refer to Figure 2 With Figure 4In some embodiments, the guide rail 1171 comprises a rail body 1102 and a beam body 1103; the rail body 1102 is fixedly connected to the beam body 1103 and extends in a circular arc shape to form an extension part with the air outlet elbow 1130 as the center; the extension part is fixedly connected to the support frame body 1172 through the beam body 1103; and the outer wall of the heating middle pipe 1120 is slidingly installed on the rail body 1102. It can be understood that, since the rail body 1102 extends in a circular arc shape to form the extension part with the rotary joint 1140 as the center, the rail body 1102 can extend along the peripheral circumference of the rotary joint 1140 to match the active track of the heating middle pipe 1120, so as to finally reduce the occurrence of the situation that the heating middle pipe 1120 is derailed. At the same time, the extension part and the support frame body 1172 are fixedly connected through the beam body 1103, so as to further improve the stability of the rail body 1102.

[0047] Please refer to Figure 2 In some embodiments, the air inlet 1101 of the air inlet elbow 1110 is provided with a filter screen 1111. It can be understood that, through the filter screen 1111, foreign matters from outside can be prevented from entering the rotary kiln 200 through the air inlet 1101 of the air inlet elbow 1110. Specifically, the filter screen 1111 is a tungsten carbide coated metal screen or an acid-resistant paint coated metal screen, which can reduce the corrosion of the filter screen 1111 by sulfur-containing gas.

[0048] Please refer to Figure 1 In some embodiments, the air inlet elbow 1110 is provided with a heat preservation sleeve 1180. It can be understood that, through the heat preservation sleeve 1180, heat preservation can be provided for the air inlet elbow 1110. Specifically, the heat preservation sleeve 1180 can be 100mm thick aluminum silicate cotton, which can protect the air inlet elbow 1110.

[0049] Please refer to Figure 1 With Figure 5The present disclosure also provides a rotary roasting device, which comprises a rotary kiln 200, a feeding assembly 300, an air induction fan 400, an air speed meter 500, and the rotary kiln air inlet mechanism 100 of any one of the above embodiments; the feeding assembly 300 and the air induction fan 400 are both communicated with the first end of the rotary kiln 200; the air induction pipe 110 is installed at the second end of the rotary kiln 200 and is communicated with the air inlet 201 of the rotary kiln 200; the air speed meter 500 is installed on the air induction pipe 110, and the detection end of the air speed meter 500 extends into the air induction pipe 110; the air speed meter 500 is used to detect the flow rate of the air entering the rotary kiln 200 and feed back the flow rate adjustment signal to the air induction fan 400, so as to keep the flow rate of the air entering the rotary kiln 200 constant. It can be understood that, since the feeding assembly 300 is communicated with the first end of the rotary kiln 200 and the air induction pipe 110 is installed at the second end of the rotary kiln 200, the feeding assembly 300 can be used to provide the rotary kiln 200 with materials and the air induction pipe 110 can be used to provide the rotary kiln 200 with hot air, so that the sulfur impurity decomposition atmosphere is achieved in the rotary kiln 200, thereby accelerating the decomposition of the sulfur impurities into sulfur-containing gas. At the same time, since the detection end of the air speed meter 500 extends into the air induction pipe 110, the flow rate of the air entering the rotary kiln 200 is detected by the air speed meter 500, and when the detected flow rate of the air does not meet the requirements, the temperature probe 130 feeds back the flow rate adjustment signal to the air induction fan 400, and the air induction fan 400 can adjust the power in real time according to the flow rate adjustment signal, so as to ensure that the flow rate of the air entering the air inlet 201 of the rotary kiln 200 is constant, thereby stabilizing the sulfur impurity decomposition atmosphere. For example, when the flow rate of the air detected by the air speed meter 500 is slow, in order to avoid the accumulation of the sulfur-containing gas which is then adsorbed by the materials, the temperature probe 130 feeds back the flow rate increase signal to the air induction fan 400, and the air induction fan 400 increases the power according to the flow rate increase signal to quickly suck the sulfur-containing gas out of the rotary kiln 200, so as to reduce the accumulation of the sulfur gas.

[0050] It should be particularly pointed out that the method for the air speed meter 500 to detect the flow rate of the air, the method for the air speed meter 500 to feed back the flow rate adjustment signal to the air induction fan 400, and the method for the air induction fan 400 to adjust the power according to the flow rate detected by the air speed meter 500 all belong to the prior art and are not within the protection scope of the present disclosure. The present disclosure only protects the elements of the rotary roasting device and the positional and connection relationships thereof. In some embodiments, the air speed meter 500 is electrically connected to the air induction fan 400, but of course, other options can also be selected by those skilled in the art.

[0051] Please refer to Figure 5In some embodiments, the rotary roasting device further comprises a tail gas absorption tower 600 and a bag filter 700; the bag filter 700 is arranged between the induced draft fan 400 and the rotary kiln 200, and the first end of the rotary kiln 200 is communicated to the air inlet of the induced draft fan 400 through the bag filter 700; the air outlet of the induced draft fan 400 is communicated to the tail gas absorption tower 600, and the dust discharge port of the bag filter 700 is communicated to the feeding assembly 300. It can be understood that, since the first end of the rotary kiln 200 is communicated to the air inlet of the induced draft fan 400 through the bag filter 700, and the dust discharge port of the bag filter 700 is communicated to the feeding assembly 300, the sulfur-containing gas discharged from the rotary kiln 200 can be dedusted by the bag filter 700 to adsorb the material particles carried in the sulfur-containing gas, and then the material particles are recycled to the feeding assembly 300 through the dust discharge port of the bag filter 700 for reuse, while the sulfur-containing gas is recycled by the tail gas absorption tower 600. The feeding assembly 300 can be a conventional screw feeder, and of course, other options can also be selected by those skilled in the art.

[0052] In one embodiment, the electrical connection can be in the form of a wired connection, a wireless connection, etc. It can be understood that the wired connection can be a wire connection or a circuit board connection, etc., the wireless connection can use Bluetooth connection or WIFI (Wireless Fidelity) connection, etc., and the specific connection mode is not limited, and those skilled in the art can also make adjustments as needed.

[0053] In some embodiments, in order to facilitate better understanding, the use process of the rotary roasting device in the above embodiment is described as follows:

[0054] Please refer to Figure 5 , the feeding assembly 300 delivers the material to the first end of the rotary kiln 200, the air outside is heated by the air heater 120 and introduced into the second end of the rotary kiln 200 through the air duct 110, the air enters the rotary kiln 200 to form a sulfur impurity decomposition atmosphere, the rotary kiln 200 roasts the material to decompose the sulfur impurities into sulfur-containing gas, the induced draft fan 400 sucks the sulfur-containing gas to make the sulfur-containing gas enter the bag filter 700, the material particles carried in the sulfur-containing gas are recycled to the feeding assembly 300 through the dust discharge port of the bag filter 700 for reuse, and the sulfur-containing gas is recycled by the tail gas absorption tower 600.

[0055] Compared with the prior art, the present disclosure has at least the following advantages:

[0056] The rotary kiln air inlet mechanism 100 described above, since the air inlet end of the air duct 110 is arranged towards the outer leakage cylinder of the rotary kiln 200 and is in communication with the outside, the heat lost by the outer leakage cylinder in the outside can enter the air duct 110 along with the outside air, and the air absorbs heat to increase the temperature, so as to reduce the temperature difference between the air in the air duct 110 and the air in the kiln. Since the detection end of the temperature probe 130 extending into the air duct 110 is located between the air heater 120 and the air inlet 201 of the rotary kiln 200, the temperature of the air entering the rotary kiln 200 is detected by the temperature probe 130, when the detected air temperature does not meet the requirements, the temperature probe 130 feeds back a temperature adjustment signal to the air heater 120, and the air heater 120 can adjust the power in real time according to the temperature adjustment signal, so as to ensure that the air temperature entering the air inlet 201 of the rotary kiln 200 is constant at the decomposition temperature of sulfur impurities, so as to reduce the temperature fluctuation in the kiln caused by the outside air entering the rotary kiln 200, and maintain the stable progress of the waste iron phosphate material desulfurization process.

[0057] The above-described embodiments only express several embodiments of the present disclosure, and the description is relatively specific and detailed, but it should not be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the present disclosure, several modifications and improvements can be made, which belong to the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure patent should be subject to the appended claims.

Claims

1. A rotary kiln air inlet mechanism (100) characterized by, The application relates to a rotary kiln air inlet mechanism (100), which comprises the following parts: an air duct (110) for being mounted on a rotary kiln (200); an air outlet end of the air duct (110) is communicated with an air inlet (201) of the rotary kiln (200), an air inlet end of the air duct (110) is arranged towards an outer leakage cylinder of the rotary kiln (200), and the air inlet end of the air duct (110) is communicated with the outside for guiding air from the outside; an air heater (120) mounted in the air duct (110); the air heater (120) is used for heating air entering the air duct (110); and a temperature probe (130) mounted on the air duct (110); a detection end of the temperature probe (130) is inserted into the air duct (110) and located between the air heater (120) and the air inlet (201) of the rotary kiln (200); the temperature probe (130) is used for detecting the temperature of air entering the rotary kiln (200) and feeding back a temperature adjusting signal to the air heater (120) so as to keep the temperature of air entering the rotary kiln (200) constant.

2. The kiln air inlet structure (100) according to claim 1, characterized in that, The air duct (110) comprises a wind inlet elbow (1110), a heating middle pipe (1120) and an air outlet elbow (1130) communicated in sequence; the air outlet elbow (1130) is used for being communicated with the air inlet (201) of the rotary kiln (200), the air heater (120) is mounted in the heating middle pipe (1120), and a wind inlet (1101) of the wind inlet elbow (1110) is arranged towards the outer leakage cylinder of the rotary kiln (200) and is communicated with the outside.

3. The kiln air inlet structure (100) according to claim 2, characterized in that, The air duct (110) further comprises a rotary joint (1140), the wind inlet elbow (1110), the heating middle pipe (1120), the air outlet elbow (1130) and the rotary joint (1140) are fixedly connected in sequence; part of the rotary joint (1140) is arranged in the air inlet (201) of the rotary kiln (200) and is rotationally connected with an inner wall of the air inlet (201); the air outlet elbow (1130) is communicated with the inside of the rotary kiln (200) through the rotary joint (1140).

4. The kiln air inlet structure (100) according to claim 3, characterized in that, The rotary kiln air inlet mechanism (100) further comprises a rotary driver (1150) and a gear transmission assembly (1160); the rotary driver (1150) is fixedly mounted on the rotary kiln (200), and a power output end of the rotary driver (1150) is connected with the rotary joint (1140) through the gear transmission assembly (1160).

5. The kiln air inlet structure (100) according to claim 4, characterized in that, The gear transmission assembly (1160) comprises a driving gear (1161) and a driven gear (1162); the driving gear (1161) is sleeved on the rotating shaft of the rotating driver (1150), and the driven gear (1162) is sleeved on the outer wall of the rotary joint (1140); the driving gear (1161) is engaged with the driven gear (1162).

6. The rotary kiln air inlet mechanism (100) of claim 3, wherein, The rotary kiln air inlet mechanism (100) further comprises a guide support (1170), the guide support (1170) comprises a guide slide rail (1171) and a support frame body (1172), the support frame body (1172) is used for being fixedly arranged on the rotary kiln (200), and the guide slide rail (1171) is fixedly installed on the support frame body (1172); the outer wall of the heating middle pipe (1120) is slidingly arranged on the guide slide rail (1171).

7. The kiln air inlet structure (100) according to claim 6, characterized in that The guide slide rail (1171) comprises a track body (1102) and a cross beam body (1103); the track body (1102) is fixedly connected with the cross beam body (1103) and extends in a circular arc shape around the rotary joint (1140) to form an extension part; the extension part is fixedly connected with the support frame body (1172) through the cross beam body (1103); and the outer wall of the heating middle pipe (1120) is slidingly installed on the track body (1102).

8. The kiln air inlet (100) of claim 2, wherein, The air inlet (1101) of the air inlet elbow (1110) is provided with a filter screen (1111); and / or, The air duct (110) is provided with a heat preservation sleeve (1180).

9. A rotary calcining apparatus characterised in that, The rotary kiln (200), the feeding assembly (300), the air duct (110), the air speed instrument (500) and the rotary kiln air inlet mechanism (100) according to any one of claims 1 to 8 are comprised; the feeding assembly (300) and the air duct (110) are both communicated with the first end of the rotary kiln (200); the air duct (110) is installed on the second end of the rotary kiln (200) and is communicated with the air inlet (201) of the rotary kiln (200); the air speed instrument (500) is installed on the air duct (110), and the detection end of the air speed instrument (500) extends into the air duct (110); the air speed instrument (500) is used for detecting the flow rate of air entering the rotary kiln (200) and feeding a flow rate adjusting signal to the air duct (110) so as to keep the flow rate of air entering the rotary kiln (200) constant.

10. The rotary calcining apparatus of claim 9, wherein The rotary roasting device further comprises a tail gas absorption tower (600) and a bag-type dust collector (700); the bag-type dust collector (700) is arranged between the air duct (110) and the rotary kiln (200), the first end of the rotary kiln (200) is communicated with the air inlet of the air duct (110) through the bag-type dust collector (700), the air outlet of the air duct (110) is communicated with the tail gas absorption tower (600), and the dust discharge port of the bag-type dust collector (700) is communicated with the feeding assembly (300).

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