A kiln head material recovery system

Abstract

The utility model relates to the technical field of kiln, disclose a kind of kiln head material recycling system, comprising: rotary kiln body;Filter dust-removal bin, is provided with filter inlet and discharge port, filter inlet is connected with the kiln head of rotary kiln body and has exhaust pipe;Transfer bin, is provided with transfer inlet, transfer outlet and first negative pressure device, first negative pressure device is used to make transfer bin inside form negative pressure, transfer inlet and discharge port are connected with discharge pipe;Dosing bin, is provided with dosing inlet, dosing outlet and second negative pressure device, second negative pressure device is used to make dosing bin inside form negative pressure, dosing inlet and transfer outlet are connected with discharge pipe;Washing tank, is communicated at dosing outlet, the utility model can realize to dust-collecting material efficiently recycling, and it is favorable to guarantee the quality consistency of recycling dust-collecting material, to ensure the production quality of re-put into use.

Description

Technical Field

[0001] This utility model relates to the field of kiln technology, and in particular to a kiln head material recovery system. Background Technology

[0002] Currently, most manufacturers use rotary kilns for desulfurization of ferric phosphate during production. During operation, a large amount of flue gas carrying materials is drawn into a dust collection chamber under negative pressure. After filtration, the flue gas produces a large amount of collected dust. Because sulfur accumulates in the bag filter structure during negative pressure transport, the excessive sulfur impurities make the reuse of the collected dust more difficult than in other processes. Directly returning the collected dust to the rotary kiln is problematic, as it is difficult to remove sulfur impurities, increases energy and material consumption, and results in poor uniformity and inconsistent material properties. Alternatively, the collected dust can be dissolved in dilute acid and then re-precipitated for further processing, but this process is lengthy and inefficient. Therefore, there is an urgent need for a kiln head material recovery device that can more efficiently reuse the collected dust obtained from the rotary kiln exhaust gas filtration. Utility Model Content

[0003] The purpose of this utility model is to provide a kiln head material recovery system to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0004] The solution to the technical problem of this utility model is:

[0005] A kiln head material recovery system includes: a rotary kiln body; a filter dust removal chamber with a filter inlet and a discharge outlet, wherein an exhaust pipe is connected between the filter inlet and the kiln head of the rotary kiln body; a transfer chamber with a transfer inlet, a transfer outlet, and a first negative pressure device, wherein the first negative pressure device is used to create a negative pressure inside the transfer chamber, and a discharge pipe is connected between the transfer inlet and the discharge outlet; a discharge chamber with a discharge inlet, a discharge outlet, and a second negative pressure device, wherein the second negative pressure device is used to create a negative pressure inside the discharge chamber, and a discharge pipe is connected between the discharge inlet and the transfer outlet; and a washing tank connected to the discharge outlet.

[0006] This technical solution has at least the following beneficial effects: Gas inside the rotary kiln is drawn from the kiln head into the exhaust pipe, and then enters the filter inlet of the dust removal chamber through the exhaust pipe. The gas is filtered by the dust removal system and discharged to the equipment at the next work station. The filtered dust is discharged from the discharge port and enters the transfer chamber through the discharge pipe from the transfer inlet. The first negative pressure device on the transfer chamber can create a negative pressure inside the transfer chamber, so that the dust is smoothly drawn into the transfer chamber. After the dust is temporarily stored in the transfer chamber, the second negative pressure device creates a negative pressure inside the discharge chamber, so that the dust temporarily stored in the transfer chamber is discharged from the transfer outlet to the discharge pipe, and then enters the discharge chamber through the discharge inlet. The dust is then fed into the washing tank from the discharge chamber. The dust is washed in the washing tank, which dissolves some of the sulfur impurities in the material, thereby meeting the usage standards of the dust. This can achieve efficient recycling of the dust and help ensure the consistency of the quality of the recycled dust, thus ensuring the production quality for reuse.

[0007] As a further improvement to the above technical solution, a first control valve and a second control valve are provided at intervals along the length of the discharge pipe.

[0008] As a further improvement to the above technical solution, the kiln head of the rotary kiln body is connected to a feed pipe, which is connected to the discharge pipe at a position between the first control valve and the second control valve, and a third control valve is provided on the feed pipe.

[0009] As a further improvement to the above technical solution, a high-temperature corrosion resistant layer is provided on the inner side of the discharge pipe, the inner side of the feed pipe, the inside of the first control valve, and the inside of the second control valve.

[0010] As a further improvement to the above technical solution, the outer side of the discharge pipe and the outer side of the feed pipe are respectively covered with a heat insulation layer.

[0011] As a further improvement to the above technical solution, an air hammer is provided on the outside of the feeding pipe.

[0012] As a further improvement to the above technical solution, a screw feeder is provided between the washing tank and the discharge outlet. The bottom sides of both ends of the screw feeder are respectively provided with a first discharge port and a second discharge port, and the first discharge port is connected to the discharge outlet.

[0013] As a further improvement to the above technical solution, a pH meter is installed inside the washing tank.

[0014] As a further improvement to the above technical solution, a first weighing device is provided on the outside of the transit warehouse, which is used to test the weight of the transit warehouse.

[0015] As a further improvement to the above technical solution, a second weighing device is provided on the outside of the feeding hopper, which is used to test the weight of the feeding hopper.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of this utility model, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0019] In the attached diagram: 100 - Rotary kiln body, 110 - Feed pipe, 111 - Third control valve, 200 - Filter dust removal chamber, 210 - Exhaust pipe, 211 - First control valve, 212 - Second control valve, 300 - Transfer chamber, 310 - First negative pressure device, 320 - Discharge pipe, 330 - First weighing device, 400 - Feed hopper, 410 - Second negative pressure device, 420 - Discharge pipe, 430 - Second weighing device, 500 - Washing tank, 600 - Screw feeder, 610 - First discharge port, 620 - Second discharge port, 700 - pH meter. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0023] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0024] Reference Figure 1 A kiln head material recovery system includes a rotary kiln body 100, a filtration and dust removal chamber 200, a transfer chamber 300, a discharge chamber 400, and a washing tank 500. The filtration and dust removal chamber 200 is used to filter the gas, for example, using a bag filter. The bag filter can filter the input gas, separating large particles in the gas for recycling as dust collection material. Correspondingly, the filtration and dust removal chamber 200 is provided with a filter inlet for input gas and a discharge outlet for discharging the dust collection material. An exhaust pipe 210 connects the filter inlet to the kiln head of the rotary kiln body 100. The transfer chamber 300 is provided with a transfer inlet, a transfer outlet, and a first negative pressure device 310. The first negative pressure device 310 is used to create a negative pressure inside the transfer chamber 300. The first negative pressure device 310 includes a first fan and a first filter. The first fan passes through the first filter to the transfer chamber 300. The system vents air to create negative pressure inside the transfer chamber 300. The first filter filters the collected dust to prevent it from being discharged from the transfer chamber 300. A discharge pipe 320 connects the transfer inlet and the discharge outlet. The discharge chamber 400 is equipped with a discharge inlet, a discharge outlet, and a second negative pressure device 410. The second negative pressure device 410 creates negative pressure inside the discharge chamber 400. Similarly, the second negative pressure device 410 includes a second fan and a second filter. The second fan vents air through the second filter to create negative pressure inside the discharge chamber 400, while the second filter filters the collected dust to prevent it from being discharged from the discharge chamber 400. A discharge pipe 420 connects the discharge inlet and the transfer outlet. A washing tank 500 is connected to the discharge outlet. Naturally, the washing tank 500 is equipped with a structure for washing the collected dust, such as a spray head.

[0025] As described above, the gas inside the rotary kiln body 100 is drawn from the kiln head into the exhaust pipe 210, and then enters the filter inlet of the dust removal chamber 200 through the exhaust pipe 210. The gas is filtered by the dust removal system and discharged to the equipment at the next work station. The filtered dust material is discharged from the discharge port and enters the transfer chamber 300 through the discharge pipe 320 from the transfer inlet. The first negative pressure device 310 on the transfer chamber 300 can create a negative pressure inside the transfer chamber 300, thereby allowing the dust material to be smoothly drawn into the transfer chamber 300. After the dust material is temporarily stored and piled up in the transfer chamber 300, ... Then, the second negative pressure device 410 creates a negative pressure inside the feeding hopper 400, causing the dust collected material temporarily stored in the transfer hopper 300 to be discharged from the transfer outlet to the discharge pipe 420, and then enters the feeding hopper 400 through the feeding inlet. The dust collected material is then fed into the washing tank 500 from the feeding hopper 400. The dust collected material is washed in the washing tank 500, which dissolves some of the sulfur impurities in the material, thereby meeting the usage standards of the dust collected material. This can achieve efficient recycling of the dust collected material and help ensure the consistency of the quality of the recycled dust collected material, thereby ensuring the production quality for reuse.

[0026] When the transfer bin 300 collects dust material from the discharge pipe 320, there is a phenomenon of air being drawn from the dust removal bin 200. This will affect the filtration and discharge of gas in the dust removal bin 200. Therefore, in this embodiment, a first control valve 211 and a second control valve 212 are provided at intervals along the length of the discharge pipe 320. The first control valve 211 and the second control valve 212 are mainly used to control the opening and closing of the pipe. For example, a flap valve can be used. During operation, the first control valve 211 and the second control valve 212 open and close alternately. Specifically, when the first control valve 211 is open, the second control valve 212 is closed. At this time, the dust collected in the dust collection chamber 200 falls into the section of the discharge pipe 320 located between the first control valve 211 and the second control valve 212. Then, the first control valve 211 closes and the second control valve 212 opens. At this time, the dust collected in the discharge pipe 320 located between the first control valve 211 and the second control valve 212 falls into the transfer chamber 300. This ensures that the dust collection chamber 200 is always under negative pressure, so that the gas can be delivered to the equipment of the next station in a timely manner. This helps to avoid the gas from remaining in the rotary kiln body 100 for a long time, which could cause the sulfur impurity content to be too high.

[0027] In practical applications, the collected dust in the filter dust collection bin 200 falls back into the kiln head of the rotary kiln body 100 to form kiln head material. Therefore, a structure for convenient recycling of kiln head material can be provided at the kiln head of the rotary kiln body 100. Specifically, the kiln head of the rotary kiln body 100 is connected to a feed pipe 110, which is connected to the discharge pipe 320 at a position between the first control valve 211 and the second control valve 212. A third control valve 111 is provided on the feed pipe 110. During use, the third control valve 111 can be periodically opened, allowing the collected dust at the kiln head of the rotary kiln body 100 to flow from the feed pipe 110 into the discharge pipe 320, and finally be recycled together into the transfer bin 300. The third control valve 111 can be a knife gate valve, which closes the feed pipe 110 when feeding is not required. This helps to avoid the negative pressure drop in the rotary kiln body 100, which could lead to gas stagnation in the recovery kiln. In practical applications, the weight in the transfer chamber 300 can be monitored after the third control valve 111 is opened. The third control valve 111 is closed in time when the weight in the transfer chamber 300 stops increasing.

[0028] Because the gas discharged from the rotary kiln body 100 has a high temperature, the temperature of the dust collected by it is also high. To prevent pipe perforation during dust collection, in this embodiment, high-temperature corrosion resistant layers are respectively provided inside the discharge pipe 320, the feed pipe 110, the first control valve 211, and the second control valve 212. By providing high-temperature corrosion resistant layers inside the discharge pipe 320, the feed pipe 110, and the internal locations of the control switches of the first and second control valves 211 and 212, the high-temperature dust collected can effectively prevent scalding and corrosion, improving overall operational stability. The high-temperature corrosion resistant layer can be a tungsten carbide coating.

[0029] To prevent gas condensation and thus hinder material flow, in this embodiment, the outer sides of the discharge pipe 320 and the discharge pipe 110 are respectively covered with insulation layers. The insulation layers can be made of aluminum silicate wool, which insulates the discharge pipe 320 and the discharge pipe 110, preventing sulfur-containing materials from condensing and adhering to the inner walls of the pipes. This improves the smoothness of material flow and enhances safety, preventing operators from accidentally touching the pipes and suffering burns.

[0030] To accelerate the discharge efficiency of the collected dust in the discharge pipe 110, in this embodiment, an air hammer is provided on the outside of the discharge pipe 110. When the discharge pipe 110 discharges the collected dust, the air hammer can be activated. The vibration of the discharge pipe 110 by the air hammer can increase the flow speed of the collected dust and help prevent the collected dust from clogging inside the discharge pipe 110.

[0031] In the above embodiment, the dust collected in the feeding hopper 400 can be directly discharged outwards. In order to facilitate quality control, in this embodiment, a screw feeder 600 is provided between the washing tank 500 and the feeding outlet. Naturally, the screw feeder 600 is provided with a rotatable screw inside, and a motor for driving the screw is provided on the outside of the screw feeder 600. The bottom sides of the two ends of the screw feeder 600 are respectively provided with a first discharge port 610 and a second discharge port 620. By controlling the forward and reverse rotation of the screw, the material can be sent to the first discharge port 610 or the second discharge port 620 respectively. The first discharge port 610 is connected to the feeding outlet. The dust collected in the feeding hopper 400 first enters the screw feeder 600, which then conveys the dust collected to the second discharge port 620. The dust collected is sampled from the second discharge port 620 for quality control. After passing the test, the screw feeder 600 then sends the dust collected to the first discharge port 610, from which the dust collected is fed into the washing tank 500.

[0032] Because the bag filter material and kiln head material contain high levels of acidic substances, the anhydrous ferric phosphate dissolves further during the washing process, reducing the recovery rate. To monitor the processing quality of the dust collection material in real time, a pH meter 700 is installed in the washing tank 500 in this embodiment. The pH meter 700 monitors the pH value in the washing tank 500 in real time. When the pH value is too low, the feeding into the lower hopper 400 is stopped manually or automatically. This helps ensure that the quality of the ferric phosphate produced under normal conditions is not reduced, thus improving the product recovery rate.

[0033] In some embodiments, a first weighing device 330 is provided on the outside of the transfer silo 300, and the first weighing device 330 is used to test the weight of the transfer silo 300. Monitoring the weight of the transfer silo 300 using the first weighing device helps to control the material level and avoid situations where there is too much or too little dust collection material in the transfer silo 300.

[0034] Similarly, a second weighing device 430 is provided on the outside of the feeding hopper 400, which is used to test the weight of the feeding hopper 400. Monitoring the weight of the feeding hopper 400 using the second weighing device helps to control the frequency and ensure the accuracy of feeding, thereby improving the controllability of product indicators.

[0035] In practical applications, the dust collected in the filtration and dust removal chamber 200 and the kiln head are both anhydrous ferric phosphate that has not undergone crystallization. However, during the sintering process, this material comes into sufficient contact with high-sulfur tail gas, resulting in a high sulfur content in the material. This is especially true in the recovery system, where the sulfur content of the ferric phosphate material is extremely high. If this material is directly returned to the sintering system for re-sintering, it not only distributes the heat and affects the crystallization of the product, but the sulfur content of the ferric phosphate is also several times higher than normal. Therefore, it needs to be returned to the washing tank 500 in a certain proportion to allow some of the sulfur in the material to dissolve. Secondly, the sulfur content in the dust collected in the filtration and dust removal chamber 200 and the kiln head is uneven at each stage. Therefore, monitoring the pH value in the washing tank 500 helps to avoid the phenomenon of anhydrous ferric phosphate re-dissolution due to excessively low acidity in the slurry in the washing tank 500, thereby improving the recovery rate of the dust collected.

[0036] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A kiln head material recovery system, characterized in that: include: Rotary kiln body (100); The dust removal and filtration chamber (200) is provided with a filter inlet and a discharge outlet. An exhaust pipe (210) is connected between the filter inlet and the kiln head of the rotary kiln body (100). The transfer chamber (300) is provided with a transfer inlet, a transfer outlet and a first negative pressure device (310). The first negative pressure device (310) is used to create a negative pressure inside the transfer chamber (300). A discharge pipe (320) is connected between the transfer inlet and the discharge outlet. The feeding hopper (400) is provided with a feeding inlet, a feeding outlet and a second negative pressure device (410). The second negative pressure device (410) is used to create a negative pressure inside the feeding hopper (400). A discharge pipe (420) is connected between the feeding inlet and the transfer outlet. A washing tank (500) is connected to the discharge outlet.

2. The kiln head material recovery system according to claim 1, characterized in that: The discharge pipe (320) is provided with a first control valve (211) and a second control valve (212) spaced apart along its length.

3. The kiln head material recovery system according to claim 2, characterized in that: The rotary kiln body (100) has a kiln head connected to a feed pipe (110). The feed pipe (110) is connected to the discharge pipe (320) located between the first control valve (211) and the second control valve (212). A third control valve (111) is provided on the feed pipe (110).

4. The kiln head material recovery system according to claim 3, characterized in that: High-temperature corrosion resistant layers are respectively provided inside the discharge pipe (320), the discharge pipe (110), the first control valve (211), and the second control valve (212).

5. The kiln head material recovery system according to claim 3, characterized in that: The outer side of the discharge pipe (320) and the outer side of the feed pipe (110) are respectively covered with a heat insulation layer.

6. The kiln head material recovery system according to claim 3, characterized in that: An air hammer is provided on the outside of the feed pipe (110).

7. The kiln head material recovery system according to claim 1, characterized in that: A screw feeder (600) is provided between the washing tank (500) and the discharge outlet. A first discharge port (610) and a second discharge port (620) are respectively provided on the bottom side of both ends of the screw feeder (600). The first discharge port (610) is connected to the discharge outlet.

8. The kiln head material recovery system according to claim 1, characterized in that: A pH meter (700) is installed inside the washing tank (500).

9. A kiln head material recovery system according to claim 1, characterized in that: A first weighing device (330) is provided on the outside of the transit warehouse (300), and the first weighing device (330) is used to test the weight of the transit warehouse (300).

10. A kiln head material recovery system according to claim 1, characterized in that: A second weighing device (430) is provided on the outside of the feeding hopper (400), and the second weighing device (430) is used to test the weight of the feeding hopper (400).

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