Temperature measuring device and lime kiln

Abstract

The temperature measuring device comprises a protection pipe, a first temperature measuring piece and a second temperature measuring piece, the protection pipe is provided with a protection cavity with an opening in one end, the first part of the protection pipe is used for being installed in a spray gun pipe of the lime kiln, and the second part of the protection pipe is used for stretching out of the spray gun pipe and located in a combustion zone in the lime kiln. The first temperature measuring piece penetrates through the opening and extends into the protection cavity, so that the temperature measuring end of the first temperature measuring piece corresponds to a spray gun opening of the spray gun pipe. And the second temperature measuring piece penetrates through the opening and extends into the protection cavity, so that the temperature measuring end of the second temperature measuring piece is arranged corresponding to the combustion zone. The first temperature measuring piece and the second temperature measuring piece are physically protected through the protection pipe, direct corrosion of high-temperature combustion dust and high pressure to the temperature measuring pieces is avoided, meanwhile, the temperature measuring ends of the first temperature measuring piece and the second temperature measuring piece are adjusted and controlled to be located at different positions, dual detection of the temperature of the spray gun and the combustion temperature can be achieved, and the detection efficiency is improved. And the requirements of multi-class temperature detection are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lime kiln thermal detection equipment, and particularly relates to a temperature measuring device and a lime kiln. BACKGROUND

[0002] The double-chamber lime kiln has two kiln chambers, and the two kiln chambers alternately enter the working state of combustion-preheating. A plurality of lances are arranged in each kiln chamber, and fuel is shot to the kiln chamber through the lances and burned after being mixed with combustion air at high temperature.

[0003] At present, in each kiln chamber of the double-chamber lime kiln, a temperature measuring thermocouple is arranged at a position close to the center of the kiln chamber to detect the temperature at the outlet of the lance and further determine whether the lance is burned out.

[0004] However, in the strong oxidizing and high-heat flue gas environment, the service life of the existing temperature measuring thermocouple is short and the temperature measuring thermocouple is prone to failure. At the same time, in the thermal control process of the lime kiln, only the temperature at the outlet of the lance is measured, and it is difficult to meet the thermal control demand.

[0005] Therefore, how to prolong the service life of the temperature measuring device and meet the measurement demand of various thermal parameters has become a technical problem to be solved. SUMMARY

[0006] The first aspect of the present application discloses a temperature measuring device for a lime kiln, comprising a protection tube, a first temperature measuring element and a second temperature measuring element. The protection tube has a protection cavity with an open end. A first part of the protection tube is used to be installed in a lance pipe of the lime kiln, and a second part of the protection tube is used to be exposed out of the lance pipe and located in a combustion zone in the lime kiln. The first temperature measuring element extends into the protection cavity through the opening, so that a temperature measuring end of the first temperature measuring element is arranged corresponding to a lance port of the lance pipe. The second temperature measuring element extends into the protection cavity through the opening, so that a temperature measuring end of the second temperature measuring element is arranged corresponding to the combustion zone.

[0007] In a possible implementation, the protection tube comprises a first protection tube and a second protection tube. The first protection tube is used to be installed in the lance pipe, and the first temperature measuring element is located in the first protection tube. The second protection tube is detachably connected with the first protection tube, and the second protection tube is used to be arranged exposed relative to the lance pipe. The temperature measuring end of the second temperature measuring element extends into the second protection tube through the first protection tube.

[0008] In a possible implementation, the first protection tube is a bent pipe, and the bent pipe comprises a horizontal segment, an arc segment and a vertical segment connected in sequence. The vertical segment is connected with the second protection tube.

[0009] In a possible implementation, an end of the second protection tube, which is away from the first protection tube, is a closed end.

[0010] In a possible implementation, the first protection tube and the second protection tube are threadedly connected.

[0011] In a possible implementation, the tube wall of the first protection tube is larger than the tube wall of the second protection tube.

[0012] In a possible implementation, the first protection tube comprises a steel tube.

[0013] In a possible implementation, the second protection tube comprises a ceramic tube.

[0014] In a possible implementation, the steel tube is a stainless steel tube.

[0015] In a possible implementation, the ceramic tube is a recrystallized silicon carbide tube.

[0016] A second aspect of the present application discloses a lime kiln, comprising a kiln shell, a lance tube and a temperature measuring device, the kiln shell having a combustion cavity and a mounting hole communicating with the combustion cavity. The lance tube is assembled on the kiln shell through the mounting hole, and at least a part of the lance tube extends into the kiln shell. The protection tube in the temperature measuring device is alternatively assembled in the lance tube.

[0017] In a possible implementation, the combustion cavity comprises two communicating combustion sub-cavities, each of which is provided with a corresponding lance tube and temperature measuring device. The lime kiln further comprises an optical pyrometer, which is arranged at the communication position of the two combustion sub-cavities.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] The temperature measuring device in the application comprises a protective tube, a first temperature measuring element and a second temperature measuring element, the protective tube has a protective cavity with an open end, the first temperature measuring element and the second temperature measuring element respectively extend into the protective cavity through the opening, the protective tube can provide physical protection for the first temperature measuring element and the second temperature measuring element, avoid the dust inside the lime kiln from directly contacting the first temperature measuring element and the second temperature measuring element under high temperature and high pressure, avoid the first temperature measuring element and the second temperature measuring element from being directly corroded, and prolong the service life. Optionally, the first temperature measuring element is a first thermocouple, and the second temperature measuring element is a second thermocouple. Part of the protective tube is used to be installed in the lance pipe of the lime kiln, and the other part of the protective tube extends out of the lance pipe, that is, compared with the lance pipe, the part of the protective tube is located in the combustion zone in the lime kiln. When the first temperature measuring element and the second temperature measuring element are installed in the protective tube, in order to realize the measurement of the temperature at different positions, the temperature measuring end of the first temperature measuring element is arranged corresponding to the lance port of the lance pipe, that is, the first temperature measuring element can measure the temperature of the lance port, so as to judge whether the lance is burnt out. The temperature measuring end of the second temperature measuring element is arranged corresponding to the combustion zone, that is, the temperature measuring end of the second temperature measuring element can extend into the fuel combustion area below the lance port, so as to monitor the combustion temperature in real time. The first temperature measuring element and the second temperature measuring element cooperate, so that the temperature of the lance port and the combustion zone can be monitored online and in real time, so as to meet the measurement requirements of multiple temperature parameters.

[0020] In the temperature measuring device disclosed in the application, the protective tube is used to physically protect the first temperature measuring element and the second temperature measuring element, avoid the direct corrosion of high-temperature combustion dust and high pressure on the temperature measuring element, at the same time, only by adjusting the temperature measuring ends of the first temperature measuring element and the second temperature measuring element to be at different positions, the double detection of the lance temperature and the combustion temperature can be realized, the requirements of multiple temperature detection can be met, and the temperature measuring device has the advantages of simple structure, low cost, wide application range and the like.

[0021] Additional aspects and advantages of the application will be described in the following description, some of which will become apparent from the following description, or will be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only some embodiments of the application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0023] Figure 1 The structural schematic diagram of the temperature measuring device provided by the embodiments of the application is shown in the figure;

[0024] Figure 2 The structural schematic diagram of the lime kiln provided by one embodiment of the application is shown in the figure;

[0025] Reference numerals:

[0026] 1 protective tube; 11 first protective tube; 12 second protective tube; 13 connection;

[0027] 2 kiln shell;

[0028] 3 lance tube;

[0029] 4 optical pyrometer. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0031] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0032] In addition, in addition to being used to indicate the orientation or positional relationship, the above-mentioned partial terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. Those of ordinary skill in the art can understand the specific meaning of these terms in the present application according to the specific situation.

[0033] In addition, the terms "mount", "set", "provided with", "connected", "connected" should be broadly understood. For example, it can be fixedly connected, detachably connected, or integrally constructed; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. Those of ordinary skill in the art can understand the specific meaning of the above-mentioned terms in the present application according to the specific situation.

[0034] In addition, the terms "first", "second", and the like are mainly used to distinguish different devices, elements or components (the specific types and structures can be the same or different), and are not intended to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise stated, the meaning of "multiple" is two or more.

[0035] The first aspect of this application discloses a temperature measuring device for a lime kiln, such as... Figure 1 and Figure 2 As shown, the system includes a protective tube 1, a first temperature measuring element, and a second temperature measuring element. The protective tube 1 has a protective cavity with one open end. The first part of the protective tube 1 is installed inside the spray gun pipe 3 of the lime kiln, and the second part of the protective tube 1 extends out of the spray gun pipe 3 and is located in the combustion zone of the lime kiln. The first temperature measuring element extends into the protective cavity through the opening, with its measuring end aligned with the nozzle of the spray gun pipe 3. The second temperature measuring element extends into the protective cavity through the opening, with its measuring end aligned with the combustion zone.

[0036] In this embodiment, the temperature measuring device includes a protective tube 1, a first temperature measuring element, and a second temperature measuring element. The protective tube 1 has a protective cavity with one end open. The first and second temperature measuring elements extend into the protective cavity through the opening, respectively. The protective tube 1 provides physical protection for the first and second temperature measuring elements, preventing dust inside the lime kiln from directly contacting them under high temperature and high pressure conditions, thus preventing direct corrosion of the first and second temperature measuring elements and extending their service life. Optionally, the first temperature measuring element is a first thermocouple, and the second temperature measuring element is a second thermocouple.

[0037] A portion of the protective tube 1 is installed inside the spray gun pipe 3 of the lime kiln, while the other portion extends out of the spray gun pipe 3. This portion of the protective tube 1 is located within the combustion zone of the lime kiln, unlike the exposed portion of the spray gun pipe 3. When the first and second temperature measuring elements are installed inside the protective tube 1, the measuring end of the first temperature measuring element is positioned corresponding to the nozzle of the spray gun pipe 3 to measure the temperature at the nozzle, thus determining whether the spray gun has burned out. The measuring end of the second temperature measuring element is positioned at the combustion zone, extending into the fuel combustion area below the nozzle to monitor the combustion temperature in real time. The first and second temperature measuring elements work together to enable online real-time monitoring of the temperatures at the nozzle and combustion zone, thus meeting the measurement needs of various temperature parameters.

[0038] It should be noted that related technologies often use indirect process estimation based on the temperature at the nozzle of the spray gun to calculate the temperature of the combustion zone. This method is easily affected by air distribution and airflow disturbances, resulting in a large error in the calculated temperature of the combustion zone. In this application, the temperature of the combustion zone is directly measured online by a second temperature measuring element located inside the protective tube 1, eliminating the need for estimation and achieving higher accuracy.

[0039] This application uses a protective tube 1 to physically protect the first and second temperature measuring elements, avoiding direct corrosion of the temperature measuring elements by high-temperature combustion dust and high pressure. At the same time, it controls the temperature measuring ends of the first and second temperature measuring elements to be in different positions, realizing dual detection of the spray gun temperature and combustion temperature, and meeting the needs of multiple types of temperature detection.

[0040] In one possible implementation, such as Figure 1 and Figure 2 As shown, the protective tube 1 includes a first protective tube 11 and a second protective tube 12. The first protective tube 11 is installed inside the spray gun tube 3, and the first temperature measuring element is located inside the first protective tube 11. The second protective tube 12 is detachably connected to the first protective tube 11 and is exposed relative to the spray gun tube 3. The temperature measuring end of the second temperature measuring element passes through the first protective tube 11 and extends into the second protective tube 12.

[0041] In this embodiment, the protective tube 1 includes a first protective tube 11 and a second protective tube 12. The first protective tube 11 is installed inside the spray gun tube 3, and the first temperature measuring element is located inside the first protective tube 11. The lower end of the first protective tube 11 is at the same plane height as the spray gun nozzle of the spray gun tube 3, so that the first temperature measuring element located inside the first protective tube 11 can monitor the temperature at the spray gun nozzle online in real time.

[0042] One aspect is that, considering the different service environments of the first protective tube 11 and the second protective tube 12, the second protective tube 12 is detachably connected to the first protective tube 11, allowing for targeted design based on their respective service environments. This also facilitates maintenance and replacement.

[0043] Specifically, the second protective tube 12 is exposed relative to the spray gun tube 3, and the temperature measuring end of the second temperature measuring element passes through the first protective tube 11 and extends into the second protective tube 12.

[0044] In one possible implementation, such as Figure 1 and Figure 2 As shown, the first protective pipe 11 is a bent pipe, which includes a horizontal section, an arc section and a vertical section connected in sequence, and the vertical section is connected to the second protective pipe 12.

[0045] In this embodiment, the first protective tube 11 is a bent tube, and its shape is adapted to the shape of the spray gun tube 3 for easy installation. Specifically, the bent tube includes a horizontal section, an arc section, and a vertical section arranged in sequence. The arc section facilitates the insertion of the first and second temperature measuring elements into the target position, and its large curvature ensures smoothness. This allows maintenance personnel outside the kiln to easily and quickly pull out and insert the thermocouple wire, greatly reducing manual labor intensity.

[0046] Specifically, the length of the first protective tube 11 is 3400 mm. The first protective tube 11 is shaped like a "7" and has a diameter of [missing information]. The arc of the arc segment is R: 400mm, and the arc length is l: 628mm.

[0047] In one possible implementation, the end of the second protective tube 12 that is away from the first protective tube 11 is a closed end.

[0048] In this embodiment, such as Figure 1 and Figure 2 As shown, the end of the second protective tube 12 that is away from the first protective tube 11 is a closed end. When the second protective tube 12 is inserted into the stone in the combustion zone, it can prevent the stone from contaminating the second temperature measuring element located inside the second protective tube 12.

[0049] In one possible implementation, the first protective tube 11 and the second protective tube 12 are threaded together.

[0050] In this embodiment, one of the first protective tube 11 and the second protective tube 12 is provided with internal threads, and the other of the first protective tube 11 and the second protective tube 12 is provided with external threads, so that the first protective tube 11 and the second protective tube 12 can be connected by threaded connection for quick assembly and disassembly.

[0051] Preferably, the lower end of the first protective tube 11 is provided with an external thread, and the upper end of the second protective tube 12 is provided with an internal thread.

[0052] In one possible implementation, the wall of the first protective tube 11 is larger than the wall of the second protective tube 12.

[0053] In this embodiment, the wall of the first protective tube 11 is larger than the wall of the second protective tube 12. The first protective tube 11 is used to be installed inside the spray gun tube 3. In order to ensure the positional stability of the first protective tube 11 and the second protective tube 12, the wall of the first protective tube 11 is made thicker, so as to ensure the connection strength between it and the spray gun tube 3 and the kiln shell 2.

[0054] Preferably, the wall thickness of the first protective tube 11 is 8 mm, and the wall thickness of the second protective tube 12 is 5 mm.

[0055] In one possible implementation, the first protective tube 11 comprises a steel pipe.

[0056] In one possible implementation, the second protective tube 12 comprises a ceramic tube.

[0057] In one possible implementation, the steel pipe is a stainless steel pipe.

[0058] In one possible implementation, the ceramic tube is a recrystallized silicon carbide tube.

[0059] In this embodiment, since the service environments of the first protective tube 11 and the second protective tube 12 are not exactly the same, by designing the first protective tube 11 and the second protective tube 12 to be made of different materials, it is possible to better adapt to the corresponding service environments and at the same time better control costs.

[0060] Specifically, the second protective tube 12 is a recrystallized silicon carbide tube, which can effectively avoid oxidation, catalysis, and dust accumulation on the outer wall in the service environment of high temperature and frequent cold blowing. While avoiding damage to the second protective tube 12, it can also ensure the temperature measurement accuracy of the internal second temperature measuring element.

[0061] Specifically, the stainless steel pipe is made of 0Cr25Ni20, which can effectively withstand the longitudinal erosion and compression of stone. The ceramic pipe possesses high strength, wear resistance, high thermal conductivity, and excellent thermal shock resistance, making it well-suited to and able to withstand the impact, erosion, and compression of high-temperature airflow and stone, with minimal temperature detection error. The performance parameters of the ceramic pipe are shown in the table below:

[0062] Table 1 Performance parameters of ceramic tubes

[0063] Indicator Density g / cm 3 ]] Mohs hardness Thermal conductivity W / (m K) Thermal pressure impact resistance °C Thermal shock resistance Performance ≥3.20 ≥9.5 ≥2.0 ≥1450 ≥30

[0064] Specifically, the length of the second protective pipe 12 is 580mm-780mm, and the pipe diameter is...

[0065] The second aspect of this application discloses a lime kiln, including a kiln shell 2, a spray gun pipe 3, and a temperature measuring device. The kiln shell 2 has a combustion chamber and a mounting hole communicating with the combustion chamber. The spray gun pipe 3 is fitted onto the kiln shell 2 through the mounting hole, and at least a portion of the spray gun pipe 3 extends into the kiln shell 2. A protective tube 1 from the temperature measuring device is optionally fitted into the spray gun pipe 3.

[0066] In this embodiment, the lime kiln includes a kiln shell 2, a spray gun pipe 3, and a temperature measuring device. The kiln shell 2 has a combustion chamber and a mounting hole communicating with the combustion chamber. The spray gun pipe 3 is mounted on the kiln shell 2 through the mounting hole. There are multiple spray gun pipes 3. One temperature measuring device is selectively mounted in one spray gun pipe 3.

[0067] Specifically, the installation methods of the temperature measuring device in the lime kiln include:

[0068] (1) Connect the first protective tube 11 and the second protective tube 12 together through the internal and external threads. Insert the assembled protective tube 1 into the kiln shell 2 through the mounting hole along the guide rail on the spray gun tube 3.

[0069] (2) Technicians enter the kiln shell 2 to inspect and adjust the protective tube 1 so that the second protective tube 12 in the protective tube 1 can be set vertically, and the connection 13 of the first protective tube 11 and the second protective tube 12 is flush with the nozzle of the spray gun tube 3, that is, it is located on the same horizontal plane.

[0070] (3) Outside the kiln shell 2, the technician inserts the first temperature measuring element and the second temperature measuring element into the protective tube 1 at the same time. The insertion depth of the first temperature measuring element is the same as the length of the first protective tube 11, that is, the temperature measuring end of the first temperature measuring element is located at the connection 13 of the first protective tube 11 and the second protective tube 12. The second temperature measuring element is inserted to the bottom end of the second protective tube 12.

[0071] (4) After the first and second temperature measuring elements are inserted into place, the corresponding seals can be tightened to stabilize the position of the protective tube 1, the first temperature measuring element and the second temperature measuring element, and to ensure that there is no air leakage.

[0072] Specifically, when the first or second temperature sensor is burned out, resulting in a malfunction in the spray gun temperature or combustion temperature detection, it can be disassembled in the following ways:

[0073] (1) Control the lime kiln to be in a heat storage state by opening the corresponding sealing parts;

[0074] (2) Pull out the damaged first or second temperature measuring element and insert the newly replaced temperature measuring element;

[0075] (3) Determine the insertion depth of the newly replaced temperature measuring element based on the lengths of the first protective tube 11 and the second protective tube 12;

[0076] (4) After the newly replaced temperature measuring element is inserted into place, the corresponding seal can be tightened to stabilize the position of the protective tube 1, the first temperature measuring element and the second temperature measuring element, and to ensure that there is no air leakage.

[0077] In one possible implementation, the combustion chamber includes two interconnected combustion sub-chambers, each equipped with a corresponding spray nozzle 3 and a temperature measuring device. The lime kiln also includes an optical pyrometer 4, which is located at the connection between the two combustion sub-chambers.

[0078] In this embodiment, the lime kiln is a double-chamber lime kiln, and the combustion chamber includes two interconnected combustion sub-chambers. Each combustion sub-chamber is equipped with multiple corresponding spray nozzles 3 and a temperature measuring device. The lime kiln also includes an optical pyrometer 4, which is located at the connection between the two combustion sub-chambers. The temperature at different locations inside the lime kiln can be detected through the first temperature measuring element, the second temperature measuring element, and the optical pyrometer 4, thereby facilitating the control of thermal parameters.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A temperature measuring device for a lime kiln, characterized in that, include: A protective tube having a protective cavity open at one end, a first part of the protective tube being installed inside the spray gun pipe of the lime kiln, and a second part of the protective tube being extended out of the spray gun pipe and located in the combustion zone of the lime kiln; The first temperature measuring element extends into the protective cavity through the opening, with the measuring end of the first temperature measuring element positioned corresponding to the nozzle of the spray gun tube. The second temperature measuring element extends into the protective cavity through the opening, with its measuring end aligned with the combustion zone.

2. The temperature measuring device according to claim 1, characterized in that, The protective tube includes: A first protective tube is used to be installed inside the spray gun tube, and the first temperature measuring element is located inside the first protective tube. The second protective tube is detachably connected to the first protective tube. The second protective tube is exposed relative to the spray gun tube. The temperature measuring end of the second temperature measuring element passes through the first protective tube and extends into the second protective tube.

3. The temperature measuring device according to claim 2, characterized in that, The first protective tube is a bent tube, which includes a horizontal section, an arc-shaped section and a vertical section connected in sequence, and the vertical section is connected to the second protective tube.

4. The temperature measuring device according to claim 2, characterized in that, The end of the second protective tube that faces away from the first protective tube is a closed end.

5. The temperature measuring device according to claim 2, characterized in that, The first protective tube and the second protective tube are threaded together.

6. The temperature measuring device according to claim 2, characterized in that, The wall of the first protective tube is larger than the wall of the second protective tube.

7. The temperature measuring device according to any one of claims 2 to 6, characterized in that, The first protective pipe includes a steel pipe; And / or, the second protective tube comprises a ceramic tube.

8. The temperature measuring device according to claim 7, characterized in that, The steel pipe is a stainless steel pipe; And / or, the ceramic tube is a recrystallized silicon carbide tube.

9. A lime kiln, characterized in that, include: A kiln shell, the kiln shell having a combustion chamber and a mounting hole communicating with the combustion chamber; Multiple spray gun tubes are respectively installed on the kiln shell through the mounting holes, and at least a portion of the spray gun tubes extends into the kiln shell; as well as The temperature measuring device according to any one of claims 1 to 8, wherein the protective tube in the temperature measuring device may be selectively assembled inside one of the spray gun tubes.

10. The lime kiln according to claim 9, characterized in that, The combustion chamber includes two connected combustion sub-chambers, and each combustion sub-chamber is provided with a corresponding plurality of spray guns and the temperature measuring device; The lime kiln also includes: An optical pyrometer is installed at the connection point between the two combustion sub-cavities.

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