Temperature measuring device in rotary kiln and rotary kiln

Abstract

The temperature measuring device in the rotary kiln comprises a plurality of temperature measuring mechanisms and a wireless transmission mechanism, the temperature measuring mechanisms are in one-to-one correspondence with a plurality of external heating elements of a furnace core tube in the rotary kiln, each temperature measuring mechanism comprises a spacer bush and a temperature measuring element, and the temperature measuring elements are arranged in the spacer bushes. One end of the spacer bush extends into an inner heating area in the furnace core pipe, the outer heating pieces heat the inner heating area in a one-to-one correspondence mode, the temperature measuring piece is arranged in the spacer bush and measures the temperature of the corresponding inner heating area, and the wireless transmission mechanism is arranged outside the furnace core pipe and used for transmitting the temperature of the corresponding inner heating area to the furnace core pipe. And the wireless transmission mechanism is connected with the temperature measuring piece. According to the utility model, the temperature of each heating area in the rotary kiln can be independently measured, and the temperature of each heating area in the rotary kiln can be accurately controlled, so that the heating temperature of materials can be accurately controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary kilns, in particular to a temperature measuring device in a rotary kiln and a rotary kiln. Background Art

[0002] A rotary kiln is a type of thermal equipment widely used in industries such as cement, metallurgy, ceramics, and environmental protection. It primarily consists of a kiln head, kiln tail, kiln drum, a heating system, and a temperature measurement system. The heating system typically utilizes electric heating, gas heating, or hot flue gas heating. The temperature measurement system typically measures the external temperature of the drum in the heating area, the exhaust gas temperature, and the internal temperature of the drum.

[0003] Hot flue gas heated rotary kilns generally use the method of measuring the flue gas inlet temperature, flue gas outlet temperature and the temperature of the exhaust gas at the end of the rotary kiln to measure the temperature of the rotary kiln. However, this method cannot measure the temperature of the material in the kiln and cannot control the temperature in sections. Electric heating or gas heated rotary kilns generally use zone heating, and the temperature measurement system generally uses external zone temperature measurement to control the temperature rise of each zone of the rotary kiln. However, this method cannot achieve accurate measurement and control of the temperature of each heating zone in the rotary kiln. With the development of industry, in the process of heating materials in the rotary kiln, the materials have higher and higher requirements for the temperature rise curve and accurate temperature control. Therefore, it is necessary to improve the existing temperature measurement system to achieve the purpose of accurately controlling the heating temperature of the materials. Utility Model Content

[0004] In order to solve at least one of the problems mentioned in the above background technology, the utility model provides a temperature measuring device in a rotary kiln and a rotary kiln, which can independently measure the temperature of each heating area in the rotary kiln and accurately control the temperature of each heating area in the rotary kiln, thereby accurately controlling the heating temperature of the material.

[0005] The specific technical solutions provided by this utility model are as follows:

[0006] In a first aspect, a temperature measuring device in a rotary kiln is provided, comprising a temperature measuring mechanism and a wireless transmission mechanism, wherein the temperature measuring mechanism is provided with multiple external heating elements corresponding one-to-one to multiple external heating elements of a furnace core tube in a rotary kiln, the temperature measuring mechanism comprises a spacer and a temperature measuring element, one end of the spacer extends into an internal heating zone in the furnace core tube, the external heating elements heat the corresponding internal heating zones one by one, the temperature measuring element is arranged in the spacer and measures the temperature of the corresponding internal heating zone, the wireless transmission mechanism is arranged outside the furnace core tube, and the wireless transmission mechanism is connected to the temperature measuring element.

[0007] By means of the above technical scheme, the utility model sets up multiple temperature measuring mechanisms corresponding to the external heating element and the internal heating zone, one end of the spacer sleeve of each temperature measuring mechanism extends into the internal heating zone, the temperature measuring element is set in the spacer sleeve and measures the temperature of the corresponding internal heating zone, so that each internal heating zone corresponds to an independent temperature measuring mechanism, and each temperature measuring element independently measures the temperature of each internal heating zone. The temperature measured by each temperature measuring element directly reflects the material temperature of each internal heating zone, ensuring the accuracy of the measured temperature of each internal heating zone while avoiding interference of other internal heating zones with the temperature measuring element of the current internal heating zone; by setting up a wireless transmission mechanism connected to the temperature measuring element, the wireless transmission mechanism uploads the temperature measured by the temperature measuring element to an external control system by wireless transmission, and the control system controls the temperature of each internal heating zone through the temperature measured by the temperature measuring element to ensure that the temperature of each internal heating zone is within the target range, thereby accurately controlling the heating temperature of the material in each internal heating zone.

[0008] As a preferred embodiment of the above scheme, one end of the spacer extending into the inner heating zone is closed, and the other end of the spacer is located outside the furnace core tube and is provided with an opening, and the temperature measuring component extends from the opening into the spacer and into the corresponding inner heating zone.

[0009] As a preferred embodiment of the above solution, the temperature measuring device in the rotary kiln further comprises a fixing frame of the temperature measuring mechanism, the fixing frame is fixed on the inner wall of the furnace core tube, and the temperature measuring mechanism is installed on the fixing frame.

[0010] As a preferred embodiment of the above solution, the fixing frame includes multiple first fixing frames, which are fixed one by one on the inner wall of the inner heating zone, and one end of the spacer extending into the inner heating zone is fixed on the corresponding first fixing frame.

[0011] As a preferred embodiment of the above scheme, the fixing frame also includes a second fixing frame, which is fixed on the inner wall of the feeding area in the furnace core tube, and the feeding area is located on one side of the inner heating area. The spacers of the multiple temperature measuring mechanisms are all fixed on the second fixing frame.

[0012] As a preferred embodiment of the above scheme, the wireless transmission mechanism includes a wireless transmission thermometer and a mounting bracket, one end of the mounting bracket is fixed on the outer wall of the furnace core tube, and the other end of the mounting bracket is away from the furnace core tube and is fixed with the wireless transmission thermometer.

[0013] As a preferred embodiment of the above scheme, the wireless transmission mechanism also includes a box body, which is fixed to the end of the mounting frame away from the furnace core tube, and the wireless transmission thermometer is installed in the box body. The box body is provided with an input terminal and an output terminal, the input terminal is connected to the temperature measuring element, and the output terminal is connected to the wireless transmission thermometer.

[0014] As a preferred embodiment of the above scheme, the lengths of the spacers corresponding to different internal heating zones are different, the end of the spacer extending into the internal heating zone is located in the middle of the corresponding internal heating zone, and the temperature measuring end of the temperature measuring component is arranged at the end of the spacer extending into the internal heating zone.

[0015] As a preferred embodiment of the above scheme, a plurality of through holes corresponding to the temperature measuring mechanisms are provided on the side wall of the furnace core tube, one end of the spacer passes through the through hole from the outside of the furnace core tube and extends into the inner heating zone, the spacer is fixed on the inner wall of the through hole and a seal is provided between the spacer and the inner wall of the through hole.

[0016] As a preferred embodiment of the above solution, the temperature measuring component includes a thermocouple.

[0017] As a preferred embodiment of the above solution, the wireless transmission mechanism is connected to a control system, and the control system is connected to the external heating element.

[0018] In a second aspect, a rotary kiln is provided, comprising a temperature measuring device inside the rotary kiln, a furnace core tube, an external heating element and an internal heating zone as described above, wherein a plurality of the external heating elements are arranged outside the furnace core tube, and a plurality of the internal heating zones are arranged inside the furnace core tube, and the internal heating zones and the external heating elements both extend along the axial direction of the furnace core tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a structural diagram of the utility model;

[0021] Figure 2 for Figure 1 Schematic diagram of the enlarged structure at A in the middle;

[0022] Figure 3 for Figure 1 A side structural diagram of

[0023] Figure 4 for Figure 3 Schematic diagram of the enlarged structure at point B in the middle. DETAILED DESCRIPTION

[0024] To make the purpose, technical solutions, and advantages of the present invention more clear, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0025] It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more centered elements can be present therebetween. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more centered elements can be present therebetween. The terms "vertical", "horizontal", "left", "right", "up", "down", "inside", "outside", "bottom", etc. used in this specification indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0026] As described in the background technology, the temperature measurement system of the rotary kiln generally adopts external partial area temperature measurement to control the temperature rise of each area of ​​the rotary kiln. This method cannot achieve accurate measurement and control of the temperature of each heating area in the rotary kiln. With the development of industry, especially the rise of the waste lithium battery recycling industry, the recycling of battery materials is increasingly using rotary kilns. The rotary kiln heats the battery materials and places increasingly higher demands on temperature control. The temperature measuring device in the rotary kiln of the present invention can achieve independent temperature measurement of each heating area in the rotary kiln, and accurately control the temperature of each heating area in the rotary kiln, thereby accurately controlling the heating temperature of the material. The embodiments of the present invention are explained in detail below.

[0027] The following content is for reference Figures 1 to 4 .

[0028] Example 1

[0029] The utility model provides a temperature measuring device in a rotary kiln, comprising a temperature measuring mechanism 1 and a wireless transmission mechanism 2, wherein the temperature measuring mechanism 1 is provided with a plurality of external heating elements 200 corresponding one-to-one to a plurality of external heating elements 200 of a furnace core tube 100 in the rotary kiln, the temperature measuring mechanism 1 comprises a spacer 11 and a temperature measuring element 12, one end of the spacer 11 extends into an internal heating zone (not shown) in the furnace core tube, the external heating elements heat the corresponding internal heating zones one by one, the temperature measuring element 12 is arranged in the spacer 11 and measures the temperature of the corresponding internal heating zone, the wireless transmission mechanism 2 is arranged outside the furnace core tube, the wireless transmission mechanism 2 is connected to the temperature measuring element 12, so that the temperature measured by the temperature measuring element 12 is transmitted to the wireless transmission mechanism 2.

[0030] In this embodiment, the number of external heating elements, internal heating zones, and temperature measuring mechanisms 1 are all eight, and the eight spacers 11 correspond to the eight temperature measuring elements 12. The spacer 11 is closed at one end extending into the corresponding internal heating zone, and the other end of the spacer 11 is located outside the furnace core tube and is provided with an opening 111. The temperature measuring element 12 extends from the opening 111 into the spacer 11 and into the corresponding internal heating zone. The lengths of the eight spacers 11 and the eight temperature measuring elements 12 corresponding to each internal heating zone are all different, and the lengths of the eight temperature measuring elements 12 corresponding to each internal heating zone are also all different.

[0031] The temperature measuring device in the rotary kiln also includes a fixed frame 3 of the temperature measuring mechanism 1, which is fixed on the inner wall of the furnace core tube, and the temperature measuring mechanism 1 is installed on the fixed frame 3. The fixed frame 3 includes a plurality of first fixed frames 31, and the first fixed frames 31 are fixed on the inner wall of the inner heating zone in a one-to-one correspondence. The end of the spacer 11 extending into the inner heating zone is fixed on the corresponding first fixed frame 31. The fixed frame 3 also includes a second fixed frame 32, and the second fixed frame 32 is fixed on the inner wall of the feed zone (not shown) in the furnace core tube. The feed zone is located on one side of the inner heating zone. The spacers 11 of the plurality of temperature measuring mechanisms 1 are all fixed on the second fixed frame 32. In this embodiment, the first fixed frame 31 is welded and fixed to the inner wall of the inner heating zone, and the second fixed frame 32 is welded and fixed to the inner wall of the feed zone. The arrangement of the first fixed frame 31 and the second fixed frame 32 prevents the spacer 11 from shaking and causing damage when the furnace core tube rotates.

[0032] The wireless transmission mechanism 2 includes a wireless transmission thermometer 21 and a mounting bracket 22. One end of the mounting bracket 22 is fixed to the outer wall of the furnace core tube, and the other end of the mounting bracket 22 is away from the furnace core tube and fixed with the wireless transmission thermometer 21. The wireless transmission mechanism 2 also includes a box 23. The box 23 is fixed to the end of the mounting bracket 22 away from the furnace core tube. The wireless transmission thermometer 21 is installed in the box 23. The box 23 is provided with an input terminal (not shown) and an output terminal (not shown). The input terminal is connected to the temperature measuring element 12, and the output terminal is connected to the wireless transmission thermometer 21 via a transmission line (not shown). The provision of the mounting bracket 22 ensures that the box 23, the input terminal, the output terminal, and the wireless transmission thermometer 21 are away from the furnace core tube, thereby preventing these components from being damaged by being in a high temperature area for a long time. In this embodiment, one end of the mounting bracket 22 is fixed to the outer wall of the feed end necked cover plate (not shown) on one side of the furnace core tube feed area. The mounting bracket 22, the box body 23 and the wireless transmission thermometer 21 rotate together with the furnace core tube. The wireless transmission thermometer 21 can be removably mounted in the box body 23 by means of fasteners such as bolts, which facilitates the maintenance operation of the wireless transmission thermometer 21. The setting of the box body 23 can protect the wireless transmission thermometer 21. At the same time, the box body 23 is provided with an input terminal and an output terminal to facilitate the connection between the wireless transmission thermometer 21 and the thermometer 12.

[0033] The lengths of the spacer sleeves 11 corresponding to different internal heating zones are different. The end of the spacer sleeve 11 extending into the internal heating zone is located in the middle of the corresponding internal heating zone to ensure the accuracy of measuring the temperature of the corresponding internal heating zone. The temperature measuring end of the temperature measuring component 12 is arranged at the end of the spacer sleeve 11 extending into the internal heating zone.

[0034] The sidewall of the furnace core tube is provided with a plurality of through-holes 101 corresponding one-to-one with the temperature measuring mechanisms 1. One end of the spacer 11 extends from the outside of the furnace core tube through the through-holes into the inner heating zone. The spacer 11 is fixed to the inner wall of the through-holes 101 and a seal (not shown) is provided between the spacer 11 and the inner wall of the through-holes 101. In this embodiment, the spacer 11 is welded to the inner wall of the through-holes 101, and the through-holes 101 are provided on the sidewall of the feed zone.

[0035] In this embodiment, the temperature measuring element 12 includes a thermocouple, one end of the thermocouple wire is connected to the incoming terminal on the box 23, and the other end extends into the spacer 11 from the opening 111 of the spacer 11 outside the furnace core tube, and extends to the middle of the corresponding internal heating zone according to the length of the corresponding spacer 11. The wireless transmission mechanism 2 is connected to a control system (not shown), and the control system is connected to the external heating element. The control system includes a host computer. When the wireless transmission thermometer 21 receives the temperature of the internal heating zone measured by the thermocouple, it is uploaded to the host computer by wireless transmission. The host computer controls the heating temperature of the external heating element based on this measured temperature to ensure that the temperature of each internal heating zone is within the target range.

[0036] When the present invention is working, the external heating element heats the furnace core tube 100 so that the temperature of the inner heating zone increases. One end of the spacer 11 of each temperature measuring mechanism 1 extends into the middle of the corresponding inner heating zone. Each thermocouple is separately arranged in the spacer 11 and the temperature measuring end is arranged in the middle of the corresponding inner heating zone. In this way, each inner heating zone corresponds to an independent temperature measuring mechanism 1, and each thermocouple independently measures the temperature of each inner heating zone. The temperature measured by each thermocouple directly reflects the material temperature of each inner heating zone, ensuring the accuracy of the temperature measured in each inner heating zone. At the same time, the thermocouple is arranged in a separate spacer 11, so as to avoid interference of other inner heating zones with the thermocouple of the current inner heating zone; the thermocouple transmits the measured temperature of the inner heating zone to the wireless transmission thermometer 21. After the wireless transmission thermometer 21 receives the temperature of the inner heating zone measured by the thermocouple, it uploads it to the host computer by wireless transmission. The host computer controls the heating temperature of the external heating element 200 according to the measured temperature to ensure that the temperature of each inner heating zone is within the target range, thereby accurately controlling the heating temperature of the material in each inner heating zone.

[0037] Example 2

[0038] The utility model provides a rotary kiln, comprising the temperature measuring device in the rotary kiln, a furnace core tube, an external heating element and an internal heating zone as described above, wherein a plurality of the external heating elements are arranged outside the furnace core tube, a plurality of the internal heating zones are arranged inside the furnace core tube, and the internal heating zones and the external heating elements both extend along the axial direction of the furnace core tube.

[0039] In this embodiment, the furnace core tube further includes a feed zone and a feed end taper cover plate, the feed end taper cover plate being connected to the feed zone, which in turn is connected to the internal heating zone. The material is fed from the feed end taper cover plate into the feed zone, and then transferred from the feed zone to the internal heating zone for heating. The temperature of the internal heating zone is accurately measured by a temperature measuring mechanism, and the temperature signal is wirelessly transmitted to a host computer. The host computer uses the measured temperature to control the heating temperature of the external heating element to ensure that the temperature of each internal heating zone is within a target range, thereby accurately controlling the heating temperature of the material in each internal heating zone.

[0040] Although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they become aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0041] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A temperature measuring device in a rotary kiln, characterized in that: It includes a temperature measuring mechanism and a wireless transmission mechanism. The temperature measuring mechanism is provided with multiple external heating elements corresponding one-to-one to the multiple external heating elements of the furnace core tube in the rotary kiln. The temperature measuring mechanism includes a spacer and a temperature measuring element. One end of the spacer extends into the internal heating zone in the furnace core tube. The external heating elements heat the corresponding internal heating zones one by one. The temperature measuring element is arranged in the spacer and measures the temperature of the corresponding internal heating zone. The wireless transmission mechanism is arranged outside the furnace core tube and is connected to the temperature measuring element.

2. The temperature measuring device in a rotary kiln according to claim 1, characterized in that: One end of the spacer extending into the inner heating zone is closed, and the other end of the spacer is located outside the furnace core tube and is provided with an opening. The temperature measuring component extends from the opening into the spacer and into the corresponding inner heating zone.

3. The temperature measuring device in a rotary kiln according to claim 1, characterized in that: It also includes a fixing frame of the temperature measuring mechanism, which is fixed on the inner wall of the furnace core tube, and the temperature measuring mechanism is installed on the fixing frame.

4. The temperature measuring device in a rotary kiln according to claim 3, characterized in that: The fixing frame includes a plurality of first fixing frames, which are fixed on the inner wall of the inner heating zone in a one-to-one correspondence, and one end of the spacer extending into the inner heating zone is fixed on the corresponding first fixing frame.

5. The temperature measuring device in a rotary kiln according to claim 4, characterized in that: The fixing frame also includes a second fixing frame, which is fixed on the inner wall of the feeding area in the furnace core tube. The feeding area is located on one side of the inner heating area. The spacers of the multiple temperature measuring mechanisms are all fixed on the second fixing frame.

6. The temperature measuring device in a rotary kiln according to claim 1, characterized in that: The wireless transmission mechanism includes a wireless transmission thermometer and a mounting frame, one end of the mounting frame is fixed on the outer wall of the furnace core tube, and the other end of the mounting frame is away from the furnace core tube and is fixed with the wireless transmission thermometer.

7. The temperature measuring device in a rotary kiln according to claim 6, characterized in that: The wireless transmission mechanism also includes a box, which is fixed to the end of the mounting frame away from the furnace core tube. The wireless transmission thermometer is installed in the box. The box is provided with an input terminal and an output terminal. The input terminal is connected to the temperature measuring component, and the output terminal is connected to the wireless transmission thermometer.

8. The temperature measuring device in a rotary kiln according to claim 1, characterized in that: The lengths of the spacers corresponding to different inner heating zones are different. The end of the spacer extending into the inner heating zone is located in the middle of the corresponding inner heating zone. The temperature measuring end of the temperature measuring component is arranged at the end of the spacer extending into the inner heating zone.

9. The temperature measuring device in a rotary kiln according to claim 1, characterized in that: The side wall of the furnace core tube is provided with a plurality of through holes corresponding to the temperature measuring mechanisms one by one. One end of the spacer sleeve extends from the outside of the furnace core tube through the through hole into the inner heating zone. The spacer sleeve is fixed on the inner wall of the through hole and a seal is provided between the spacer sleeve and the inner wall of the through hole.

10. A rotary kiln, characterized in that: It comprises a temperature measuring device in a rotary kiln, a furnace core tube, an external heating element and an internal heating zone as described in any one of claims 1 to 9, wherein a plurality of the external heating elements are arranged outside the furnace core tube, a plurality of the internal heating zones are arranged inside the furnace core tube, and the internal heating zones and the external heating elements both extend along the axial direction of the furnace core tube.

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