Kiln drying method, device and equipment for sleeve kiln and medium
By adding small-grained limestone first and then large-grained limestone into the sleeve kiln, and controlling the discharge and heating rates, the problem of refractory damage caused by unreasonable kiln baking in the sleeve kiln was solved, and the refractory life was extended and product quality was improved.
Patent Information
- Application Number
- CN202510728458.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-03
- Publication Date
- 2025-09-16
AI Technical Summary
The existing kiln drying method of the sleeve kiln is unreasonable, which affects the service condition and life of the sleeve kiln and leads to a decrease in product quality and output.
The method of adding small-grained limestone first and then adding large-grained limestone is adopted to control the discharge speed and temperature rise rate, gradually increase the output and avoid damage to the refractory materials.
Prolong the life of the refractory materials in the sleeve kiln, improve product quality and output, and reduce production costs.
Smart Images
Figure CN120647176A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of metallurgical technology, and in particular to a kiln drying method, device, equipment and medium for a sleeve kiln. Background Art
[0002] The sleeve kiln is one of the most advanced kiln types currently used in China for calcining active lime. It features a small footprint, a wide range of limestone particle sizes, low exhaust temperature, easy dust handling, negative pressure operation, safety and environmental protection, high operating efficiency, low heat consumption, and high activity in the burned lime. It holds promising prospects for development in China.
[0003] Prior to the start of formal production in a sleeve kiln, a preparatory kiln drying process is typically performed. This process removes any remaining moisture from the kiln, including moisture in masonry mortar and slurry, moisture in monolithic castables, atmospheric moisture in refractory insulation materials, and moisture retained on and within the masonry. This drying out of the moisture within the kiln protects the kiln.
[0004] However, if the kiln drying method is unreasonable, it will directly affect the service life and service life of the sleeve kiln, and ultimately affect the product quality, output and cost. Therefore, how to determine the kiln drying method is a technical problem that needs to be solved urgently. Summary of the Invention
[0005] In view of the above problems, the present invention is proposed to provide a kiln-drying method, device, equipment and medium for a sleeve kiln that solves the above problems. Small-particle limestone with less impact force can be added to the sleeve kiln first, and then large-particle limestone with greater impact force can be added. When the limestone reaches a certain height, the material is discharged so that the limestone in the sleeve kiln can be mobilized. Finally, when the small-particle limestone is basically discharged, the sleeve kiln is controlled to be ignited to increase the temperature and increase the production. This kiln-drying method can effectively increase the life of the refractory materials in the sleeve kiln, extend the service life, and improve product quality and output.
[0006] In a first aspect, the present invention provides a kiln baking method for a sleeve kiln, wherein the sleeve kiln includes a lower arch bridge and a lower combustion chamber, and the method comprises:
[0007] adding limestone of a first particle size into the sleeve kiln at a preset feeding rate;
[0008] If the height of the limestone of the first particle size reaches a preset first height threshold, the addition of the limestone of the first particle size to the sleeve kiln is stopped, and the limestone of the second particle size is added to the sleeve kiln, and the sleeve kiln is controlled to discharge at a preset first discharge speed; the first discharge speed is lower than the feeding speed, the first particle size is lower than the second particle size, and the height is the stacking height of the limestone on the lower arch bridge;
[0009] If the volume of the first particle size of limestone in the sleeve kiln is less than a preset volume threshold, the sleeve kiln is controlled to be ignited and heated at a preset heating rate until the temperature of the lower combustion chamber reaches the preset first temperature threshold, and the output of the sleeve kiln is increased to the target output according to the preset production increase method.
[0010] Optionally, after adding limestone of the first particle size into the sleeve kiln at a preset feeding speed and before stopping adding limestone of the first particle size into the sleeve kiln, the method further comprises:
[0011] If the height of the limestone of the first particle size reaches a preset second height threshold, controlling the sleeve kiln to discharge at a preset second discharge speed;
[0012] The first height threshold is greater than the second height threshold, and the first discharge speed is greater than the second discharge speed.
[0013] Optionally, heating at a preset heating rate includes:
[0014] If the temperature of the lower combustion chamber is lower than a preset second temperature threshold, heating the lower combustion chamber at a preset first heating rate;
[0015] If the temperature of the lower combustion chamber is greater than or equal to the second temperature threshold and less than a preset third temperature threshold, heating is performed at a preset second heating rate; the first heating rate is less than the second heating rate;
[0016] If the temperature of the lower combustion chamber is greater than or equal to the third temperature threshold and less than the first temperature threshold, the temperature is increased at a preset third temperature increase rate; the second temperature increase rate is less than the third temperature increase rate.
[0017] Optionally, the third heating rate is less than a preset heating rate threshold.
[0018] Optionally, increasing the output of the sleeve kiln to a target output according to a preset production increase method includes:
[0019] If the output is less than a preset first output threshold, the output is increased at a preset first output increase rate, and when the output reaches the first output threshold, the output increase is stopped, and after a preset first time period, the output is continued to be increased at a preset second output increase rate;
[0020] When the output reaches a preset second output threshold, the output increase is stopped, and after a preset second period of time, the output is continued to be increased to the target output at a preset third output increase speed;
[0021] The second production threshold is greater than the first production threshold.
[0022] Optionally, the first particle size is between 5 and 30 mm, and the second particle size is between 30 and 80 mm.
[0023] Optionally, the sleeve kiln includes a gas pipeline. After the volume of the limestone of the first particle size in the sleeve kiln is less than a preset volume threshold and before controlling the ignition of the sleeve kiln, the method further includes:
[0024] Nitrogen is blown into the gas pipeline to reduce the oxygen content in the gas pipeline.
[0025] In a second aspect, the present invention provides a kiln drying device for a sleeve kiln, wherein the sleeve kiln comprises a lower arch bridge and a lower combustion chamber, and the device comprises:
[0026] A feeding module, used for feeding limestone of a first particle size into the sleeve kiln at a preset feeding speed;
[0027] a first control module, configured to stop feeding the limestone of the first particle size into the sleeve kiln and feed the limestone of the second particle size into the sleeve kiln if the height of the limestone of the first particle size reaches a preset first height threshold, and control the sleeve kiln to discharge the limestone at a preset first discharge speed; the first discharge speed is lower than the feeding speed, the first particle size is lower than the second particle size, and the height is the stacking height of the limestone on the lower arch bridge;
[0028] The second control module is used to control the ignition of the sleeve kiln and to increase the temperature at a preset heating rate if the volume of the first particle size of the limestone in the sleeve kiln is less than a preset volume threshold, until the temperature of the lower combustion chamber reaches a preset first temperature threshold, and then increase the output of the sleeve kiln to the target output according to a preset production increase method.
[0029] In a third aspect, the present invention provides an electronic device comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method described in the first aspect by executing the computer instructions.
[0030] In a fourth aspect, the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the method described in the first aspect.
[0031] The technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:
[0032] The embodiment of the present invention provides a kiln drying method, device, equipment and medium for a sleeve kiln, which can add limestone of the first particle size into the sleeve kiln at a preset feeding speed, and add fine material first to reduce the impact on the refractory material; if the height of the limestone of the first particle size reaches a preset first height threshold, then stop adding the limestone of the first particle size into the sleeve kiln, and add limestone of the second particle size into the sleeve kiln, and control the sleeve kiln to discharge at a preset first discharge speed to discharge the fine material, so as to facilitate subsequent kiln drying with material; if the volume of the limestone of the first particle size in the sleeve kiln is less than the preset volume threshold, then control the ignition of the sleeve kiln and heat it at a preset heating rate until the temperature of the lower combustion chamber reaches the preset first temperature threshold, and then increase the output of the sleeve kiln to the target output according to the preset production increase method. This method can effectively improve the life of the refractory material in the sleeve kiln, extend its service life, and improve product quality and output.
[0033] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS
[0034] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:
[0035] Figure 1 This is a schematic structural diagram of a sleeve kiln provided in an embodiment of the present application;
[0036] Figure 2 This is a flow chart of a kiln drying method for a sleeve kiln provided in an embodiment of the present application;
[0037] Figure 3 This is a temperature change curve of the combustion chamber during kiln baking provided by an embodiment of the present application;
[0038] Figure 4 This is a structural block diagram of a kiln drying device of a sleeve kiln provided in an embodiment of the present application. DETAILED DESCRIPTION
[0039] In order to make the purpose, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings. It should be understood that the embodiments of the present disclosure and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, rather than limitations on the technical solutions of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.
[0040] Before giving a detailed introduction to a kiln baking method for a sleeve kiln provided in an embodiment of the present application, a brief introduction to the implementation environment involved is first given.
[0041] Figure 1 This is a schematic diagram of the structure of a sleeve kiln provided in an embodiment of the present application. Figure 1 As shown, the sleeve kiln includes a kiln shell 1, an upper inner tube 2, a lower inner tube 3, an upper arch bridge 4, a lower arch bridge 5, an upper burner 6, a lower burner 7 and a lower combustion chamber 8.
[0042] In the embodiment of the present application, the sleeve kiln is composed of a concentric annular space with equal spacing formed between the kiln shell 1 and the upper inner tube 2 and the lower inner tube 3. The limestone moves down along this space and is burned into lime. The refractory lining in the kiln shell 1 and the refractory lining outside the upper and lower inner tubes are connected by the upper arch bridge 4 and the lower arch bridge 5. The calcination zone is arranged with two layers of burners, namely the upper burner 6 and the lower burner 7. The burners of each layer are arranged at equal distances, and the upper burners and the lower burners are staggered. Since the cross-section of the annular space is relatively thin, the heat conduction is mainly by radiation, thus forming a decomposition atmosphere with strong heat penetration and uniform calcination of limestone, which is conducive to the production of high-quality lime. The sleeve kiln is also a negative pressure production, which is beneficial to environmental protection; secondly, it is easy to operate; thirdly, it is a full-process negative pressure production, which is conducive to the removal of CO2 and the production of highly active lime; fourthly, the operation status of the lime kiln can be checked at any time, which is conducive to maintenance.
[0043] Among them, the kiln shell 1 is welded with ordinary steel plates, and the inner wall is built with insulating refractory bricks. The important parts of the kiln shell 1 are equipped with peepholes for monitoring and inspecting the interior and inspection holes for maintenance and inspection. The upper and lower burners are installed in the middle of the outer kiln skin, and an arch bridge is provided at the top of the combustion chamber, which can prevent the limestone from directly contacting the combustion flame and make the combustion gas spread evenly in the combustion zone.
[0044] The inner tube consists of an upper tube 2 and a lower tube 3, welded from boiler steel plates. The inner tube wall is a sandwich structure with forced air circulation, and the inner and outer walls are constructed of refractory masonry. The upper tube 2 is suspended from the upper portion of the kiln; the lower tube 3 is mounted on the lower foundation. The upper tube 2 is connected to the exhaust gas inlet of the heat exchanger; the lower tube 3 is equipped with a recirculating gas channel. Gas enters from the bottom of the lower tube 3 and is introduced from the top of the lower tube 3 through the recirculating gas channel into the ejector. The ejector is connected to the lower combustion chamber 8, where it delivers the recirculating gas for secondary combustion.
[0045] The sleeve kiln has two layers of burners, six evenly spaced on each layer. The lower burners divide the kiln into two calcination zones: a countercurrent calcination zone and a downstream calcination zone. The upper zone is the countercurrent calcination zone, while the lower zone is the downstream calcination zone. The downstream calcination zone begins in the lower combustion chamber 8 and ends at the circulating gas inlet. The preheating zone is approximately 9 meters long, with a temperature range of 90-140°C at the top and 850-900°C at the junction of preheating and calcining. The calcining zone is approximately 11 meters long, with a temperature range of 850-900°C at the junction of preheating and calcining to 900-950°C at the junction of calcining and cooling. The cooling zone is approximately 7 meters long, with a temperature range of 900-950°C to 80-150°C. In the preheating zone, limestone is heated to its calcining temperature (850-900°C). Excess heat is always generated in the preheating zone, so the sleeve kiln is designed with an upper inner tube (2) and a heat exchanger in the lime preheating zone. Excess heat from the preheating zone flows through the upper inner tube (2) into the heat exchanger, where it is used to heat the drive air, minimizing heat loss and keeping the exhaust gas temperature as low as possible. The heated drive air is then transported to the ejector via the upper ring pipe. The entire calcining process takes place in the calcining zone, with 70-80% occurring in the countercurrent calcining zone and the remaining 20-30% in the downstream calcining zone. The limestone enters the calcining zone at a temperature of approximately 850-900°C, while the lime enters the cooling zone at the bottom of the downstream calcining zone, reaching a temperature of approximately 900-950°C. In the cooling zone, the hot lime exchanges heat with cool air drawn in from the kiln bottom, cooling it and exiting the kiln at a temperature of approximately 80-130°C.
[0046] The kiln drying process of a sleeve kiln is a crucial and essential preparatory step for the equipment's transition from start-up to normal production. Whether the kiln is properly dried and the proper drying method is used directly impacts the kiln's service life and service life, ultimately affecting product quality, output, and cost. Even with a well-designed sleeve kiln structure and excellent construction quality, neglecting the drying process can lead to cracking during operation, resulting in poor airtightness, uncontrolled pressure and temperature regulation, and ultimately disrupted production. In severe cases, the kiln structure can deform or even partially collapse, halting production entirely within the sleeve kiln, with serious consequences.
[0047] The primary task of a sleeve kiln is to remove residual moisture from the kiln body. This includes moisture in masonry mortar and slurry, moisture in monolithic castables, atmospheric moisture adsorbed in refractory insulation materials, and moisture retained on and within the masonry. If moisture in the kiln body is not dried out, the rapid increase in temperature during normal use will cause the water to rapidly expand as it converts to gas, potentially damaging the kiln body.
[0048] Figure 2 This is a flow chart of a kiln drying method for a sleeve kiln provided in an embodiment of the present application. Figure 2 As shown, the method includes:
[0049] Step S210: adding limestone of a first particle size into the sleeve kiln at a preset feeding speed.
[0050] In the embodiment of the present application, the time of charging is determined according to the construction period of the sleeve kiln. For example, charging is started 3 days before the sleeve kiln is ignited, and the fine material of the first particle size (limestone) is first loaded into the kiln.
[0051] Optionally, the first particle size is between 5 and 30 mm. The fine material is loaded first, and the impact of the fine material on the kiln body is relatively small, which can protect the refractory material.
[0052] Step S220: If the height of the limestone of the first particle size reaches a preset first height threshold, stop adding the limestone of the first particle size to the sleeve kiln, add the limestone of the second particle size to the sleeve kiln, and control the sleeve kiln to discharge at a preset first discharge speed.
[0053] Among them, the first discharging speed is smaller than the feeding speed, the first particle size is smaller than the second particle size, and the height is the stacking height of the graystone on the lower arch bridge.
[0054] In this embodiment, if the height of the limestone of the first particle size reaches a preset first height threshold, it indicates that sufficient fine material has been loaded and the upper and lower arches are covered with fine material. At this point, adding lime of a normal particle size will not damage the refractory. At the same time, discharge begins at the first discharge speed, discharging the fine material first.
[0055] Exemplarily, the first discharge rate is 150 tons per day, the feed rate is 40 tons per hour, and the first height threshold is a height of 200 mm above the upper arch bridge.
[0056] In the embodiment of the present application, by pre-calibrating the weight of fine material required to bring the height of the first-size limestone to a preset first height threshold, the loading process can be used to determine when to stop loading the fine material and when to start loading the normal limestone based on the weight of the fine material. For example, after loading the target weight of the first-size limestone, the first-size limestone is stopped from being added to the sleeve kiln, and the second-size limestone is added. For example, the target weight is 1000 tons.
[0057] Optionally, the second particle size is between 30 and 80 mm. The second particle size is the size of normally calcined limestone.
[0058] Step S230: If the volume of the first-size limestone in the sleeve kiln is less than a preset volume threshold, the sleeve kiln is controlled to be ignited and heated at a preset heating rate until the temperature of the lower combustion chamber reaches a preset first temperature threshold. Then, the output of the sleeve kiln is increased to the target output according to a preset production increase method.
[0059] In this embodiment of the present application, if the volume of the first-size limestone within the sleeve kiln is less than a preset volume threshold, indicating that the fine material has been substantially exhausted, the sleeve kiln can be ignited and the kiln can be heated with the material. During this process, the temperature of the lower combustion chamber is gradually increased to prevent damage to the refractory material caused by excessive temperature rise. Once the temperature of the lower combustion chamber reaches the first temperature threshold, the kiln output is gradually increased until the sleeve kiln reaches normal production. The kiln heating is completed, and normal production resumes.
[0060] Optionally, between step S210 and step S220, the method further includes:
[0061] If the height of the limestone of the first particle size reaches a preset second height threshold, the sleeve kiln is controlled to discharge at a preset second discharge speed;
[0062] The first height threshold is greater than the second height threshold, and the first discharge speed is greater than the second discharge speed.
[0063] In an embodiment of the present application, when the height of the limestone of the first particle size reaches a preset second height threshold, the sleeve kiln can be controlled to start discharging at a second discharging speed, so that the limestone in the sleeve kiln can flow continuously, and try to avoid the limestone from agglomerating or sticking to the kiln body, which affects the quality of subsequent calcination.
[0064] Exemplarily, the second height threshold is 0, and the second discharge speed is 2.2 tons per hour.
[0065] Optionally, step S230 includes:
[0066] If the temperature of the lower combustion chamber is lower than a preset second temperature threshold, heating is performed at a preset first heating rate;
[0067] If the temperature of the lower combustion chamber is greater than or equal to the second temperature threshold and less than a preset third temperature threshold, heating is performed at a preset second heating rate;
[0068] If the temperature of the lower combustion chamber is greater than or equal to the third temperature threshold and less than the first temperature threshold, the temperature is increased at a preset third temperature increase rate.
[0069] The first heating rate is lower than the second heating rate; and the second heating rate is lower than the third heating rate.
[0070] In the embodiment of the present application, after the lower combustion chamber is ignited, the gas valve should be adjusted down and the air valve should be adjusted up to reduce the amount of gas and provide excess air to slow down the temperature rise. The temperature rise process can be controlled according to a pre-calibrated curve to gradually increase the temperature of the lower combustion chamber. Figure 3 This is a temperature change curve of the combustion chamber during kiln baking provided by an embodiment of the present application, such as Figure 3As shown, if the temperature of the lower combustion chamber is less than the second temperature threshold T2, the temperature is increased at a smaller first heating rate; if the temperature of the lower combustion chamber is greater than or equal to the second temperature threshold T2 and less than the third temperature threshold T3, the temperature is increased at a slightly larger second heating rate; if the temperature of the lower combustion chamber is greater than or equal to the third temperature threshold T3 and less than the first temperature threshold T1, the temperature is increased at a larger third heating rate, and the heating rate of the lower combustion chamber is gradually increased so that the temperature of the lower combustion chamber can rise slowly, effectively avoiding the shedding and damage of the refractory material.
[0071] Optionally, the third heating rate is less than a preset heating rate threshold.
[0072] In the embodiment of the present application, the heating rate should not be too fast to prevent the refractory material from falling off and being damaged due to excessive temperature rise. For example, the heating rate threshold is 10°C per hour, or the temperature does not exceed 300°C per day.
[0073] like Figure 3 As shown, the fourth temperature threshold T4, the fifth temperature threshold T5 and the sixth temperature threshold T6 are also included, T4<T5<T2<T6<T3<T1. Therefore, in the embodiment of the present application, step S230 also includes:
[0074] When the temperature of the lower combustion chamber is lower than the fourth temperature threshold value T4, the temperature is increased at the first temperature increase rate, and starting from the time when the temperature of the lower combustion chamber rises to the fourth temperature threshold value T4, the temperature increase is temporarily stopped and the state enters the heat preservation state. After the third time length t3 (the time of heat preservation t3), the temperature is then increased at the first temperature increase rate; when the temperature of the lower combustion chamber rises from the fourth temperature threshold value T4 to the fifth temperature threshold value T5, the temperature increase is stopped and the state enters the heat preservation state. After the fourth time length t4 (the time of heat preservation t4), the temperature is then increased at the first temperature increase rate; when the temperature of the lower combustion chamber rises from the fifth temperature threshold value T5 to the second temperature threshold value T2, the temperature increase is stopped and the state enters the heat preservation state. In the warm state, after the fifth time t5 (keeping time t5), the temperature starts to be increased at the second heating rate; when the temperature of the lower combustion chamber rises from the second temperature threshold value T2 to the sixth temperature threshold value T6, the temperature is stopped and the state enters the warm state. After the sixth time t6 (keeping time t6), the temperature is continued to be increased at the second heating rate; when the temperature of the lower combustion chamber rises from the sixth temperature threshold value T6 to the third temperature threshold value T3, the temperature is stopped and the state enters the warm state. After the seventh time t7 (keeping time t7), the temperature is started to be increased at the third heating rate until the temperature of the lower combustion chamber reaches the first temperature threshold value, the heating is ended, and the production is started to be increased.
[0075] Exemplarily, T4 is 250°C, T5 is 350°C, T2 is 400°C, T6 is 600°C, T3 is 800°C, T1 is 1000°C, t3 is 35 hours, t4 is 40 hours, t5 is 24 hours, t6 is 36 hours, t7 is 24 hours, the first heating rate is 5°C / hour, the second heating rate is 10°C / hour, and the third heating rate is 15°C / hour.
[0076] Optionally, step S230 includes:
[0077] If the output is less than a preset first output threshold, the output is increased at a preset first output increase rate, and when the output reaches the first output threshold, the output increase is stopped, and after a preset first period of time, the output is continued to be increased at a preset second output increase rate;
[0078] When the output reaches a preset second output threshold, the production increase is stopped, and after a preset second period of time, the output is continued to be increased to the target output at a preset third production increase speed;
[0079] The second production threshold is greater than the first production threshold.
[0080] In an embodiment of the present application, after the temperature of the lower combustion chamber rises to T1, the output is increased at a first production increase rate. When the output reaches the first output threshold, it is stabilized for a first period of time. After stabilization, the output is continued to be increased at a second production increase rate. When the output reaches the second output threshold, it is stabilized for a second period of time. After stabilization, the output is increased at a third production increase rate. When the output reaches the target output, it is stabilized for 8 hours and finally enters a normal production state.
[0081] The first, second, and third production increase rates can be the same, for example, 15 tons / hour. The first and second durations can be the same, for example, 1 hour. The first production threshold can be 300 tons, the second production threshold can be 400 tons, and the target production can be 450 or 480 tons.
[0082] Optionally, the sleeve kiln includes a gas pipeline. After the volume of the limestone of the first particle size in the sleeve kiln is less than a preset volume threshold and before controlling the ignition of the sleeve kiln, the method further includes:
[0083] Blow nitrogen into the gas pipeline to reduce the oxygen content in the gas pipeline.
[0084] In this embodiment of the present application, the gas pipeline is used to deliver gas to the combustion chamber, which generates heat by burning the gas. After the fine material in the sleeve kiln is basically exhausted, nitrogen can be purged into the gas pipeline to reduce the oxygen content in the gas pipeline and prevent explosion during ignition.
[0085] The kiln baking method in the embodiment of the present application can effectively increase the life of refractory materials and reduce the occurrence of substandard lime quality and output caused by fluctuations in refractory material quality during production. The production cycle of a sleeve kiln is generally 5 years. Due to inadequate baking of refractory materials, the refractory materials will begin to crack and fall off after 3 years of use, causing the kiln condition to decline, and the output will drop from 450 tons to 300 tons. The cost per ton of ash is about 700 yuan. Therefore, by adjusting this method, such a situation can be avoided, resulting in an annual loss of: (450-300)*30*12*600*2 / 5=12.96 million yuan.
[0086] Based on the same inventive concept, the embodiment of the present application also provides a kiln drying device for a sleeve kiln. Figure 4 This is a structural block diagram of a kiln drying device of a sleeve kiln provided in an embodiment of the present application. Figure 4 As shown, the device 400 includes a joining module 401 , a first control module 402 and a second control module 403 .
[0087] The adding module 401 is used to add limestone of a first particle size into the sleeve kiln at a preset feeding speed;
[0088] The first control module 402 is configured to stop feeding the limestone of the first particle size into the sleeve kiln if the height of the limestone of the first particle size reaches a preset first height threshold, and to feed the limestone of the second particle size into the sleeve kiln, and to control the sleeve kiln to discharge the limestone at a preset first discharge speed; the first discharge speed is lower than the feed speed, the first particle size is lower than the second particle size, and the height is the height of the limestone accumulation on the lower arch bridge;
[0089] The second control module 403 is used to control the ignition of the sleeve kiln and to increase the temperature at a preset heating rate if the volume of the first particle size of the limestone in the sleeve kiln is less than a preset volume threshold, until the temperature of the lower combustion chamber reaches a preset first temperature threshold, and then increase the output of the sleeve kiln to the target output according to a preset production increase method.
[0090] Optionally, the apparatus 400 further includes a third control module, configured to:
[0091] If the height of the limestone of the first particle size reaches a preset second height threshold, the sleeve kiln is controlled to discharge at a preset second discharge speed;
[0092] The first height threshold is greater than the second height threshold, and the first discharge speed is greater than the second discharge speed.
[0093] Optionally, the second control module 403 is further configured to:
[0094] If the temperature of the lower combustion chamber is lower than a preset second temperature threshold, heating is performed at a preset first heating rate;
[0095] If the temperature of the lower combustion chamber is greater than or equal to the second temperature threshold and less than the preset third temperature threshold, the temperature is increased at a preset second temperature increase rate; the first temperature increase rate is less than the second temperature increase rate;
[0096] If the temperature of the lower combustion chamber is greater than or equal to the third temperature threshold and less than the first temperature threshold, the temperature is increased at a preset third temperature increase rate; the second temperature increase rate is less than the third temperature increase rate.
[0097] Optionally, the third heating rate is less than a preset heating rate threshold.
[0098] Optionally, the second control module 403 is further configured to:
[0099] If the output is less than a preset first output threshold, the output is increased at a preset first output increase rate, and when the output reaches the first output threshold, the output increase is stopped, and after a preset first period of time, the output is continued to be increased at a preset second output increase rate;
[0100] When the output reaches a preset second output threshold, the production increase is stopped, and after a preset second period of time, the output is continued to be increased to the target output at a preset third production increase speed;
[0101] The second production threshold is greater than the first production threshold.
[0102] Optionally, the first particle size is between 5 and 30 mm, and the second particle size is between 30 and 80 mm.
[0103] Optionally, the sleeve kiln includes a gas pipeline, and the device 400 further includes a purge module for:
[0104] Blow nitrogen into the gas pipeline to reduce the oxygen content in the gas pipeline.
[0105] It can be understood that the device provided in the above embodiment is only illustrated by the division of the above functional modules. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.
[0106] An embodiment of the present invention further provides an electronic device, which may include a processor and a memory, wherein the processor and the memory may be communicatively connected to each other via a bus or other means.
[0107] The processor may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application, or may also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components and other chips, or a combination of the above types of chips.
[0108] The memory may include a large capacity memory for data or instructions. By way of example and not limitation, the memory may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive, or a combination of two or more of these. Where appropriate, the memory may include removable or non-removable (or fixed) media. Where appropriate, the memory may be internal or external to the electronic device. In certain embodiments, the memory may be a non-volatile solid-state memory.
[0109] In one embodiment, the memory may be a read-only memory (ROM). In one embodiment, the ROM may be a mask-programmable ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM), or a flash memory, or a combination of two or more of these.
[0110] The processor reads and executes the computer program instructions stored in the memory to implement any one of the kiln baking methods of the sleeve kiln in the above embodiments.
[0111] In one example, the electronic device may further include a communication interface and a bus. The processor, memory, and communication interface are connected via the bus and communicate with each other. The communication interface is primarily used to enable communication between the various modules, devices, units, and / or devices in the embodiments of this application. Where appropriate, the bus may include one or more buses.
[0112] In addition, in conjunction with the kiln-drying method for a sleeve kiln in the above-mentioned embodiment, an embodiment of the present invention may provide a computer-readable storage medium for implementation. The computer-readable storage medium stores computer program instructions; when the computer program instructions are executed by a processor, any of the kiln-drying methods for a sleeve kiln in the above-mentioned embodiment is implemented.
[0113] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. The storage medium can be a read-only memory (ROM), a random access memory (RAM), a flash memory, a hard disk drive (HDD), or a solid-state drive (SSD). The storage medium can also include a combination of the above-mentioned types of memory.
[0114] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:
[0115] The embodiment of the present invention provides a kiln drying method, device, equipment and medium for a sleeve kiln, which can add limestone of the first particle size into the sleeve kiln at a preset feeding speed, and add fine material first to reduce the impact on the refractory material; if the height of the limestone of the first particle size reaches a preset first height threshold, then stop adding the limestone of the first particle size into the sleeve kiln, and add limestone of the second particle size into the sleeve kiln, and control the sleeve kiln to discharge at a preset first discharge speed to discharge the fine material, so as to facilitate subsequent kiln drying with material; if the volume of the limestone of the first particle size in the sleeve kiln is less than the preset volume threshold, then control the ignition of the sleeve kiln and heat it at a preset heating rate until the temperature of the lower combustion chamber reaches the preset first temperature threshold, and then increase the output of the sleeve kiln to the target output according to the preset production increase method. This method can effectively improve the life of the refractory material in the sleeve kiln, extend its service life, and improve product quality and output.
[0116] In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.
[0117] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the claims below, inventive aspects lie in less than all the features of the individual embodiments disclosed above. Accordingly, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of the invention.
[0118] It should be noted that the above embodiments illustrate rather than limit the invention, and that a person skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between brackets should not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The present invention may be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.
Claims
1. A kiln drying method for a sleeve kiln, characterized in that: The sleeve kiln includes a lower arch bridge and a lower combustion chamber, and the method includes: adding limestone of a first particle size into the sleeve kiln at a preset feeding rate; If the height of the limestone of the first particle size reaches a preset first height threshold, the addition of the limestone of the first particle size to the sleeve kiln is stopped, and the limestone of the second particle size is added to the sleeve kiln, and the sleeve kiln is controlled to discharge at a preset first discharge speed; the first discharge speed is lower than the feeding speed, the first particle size is lower than the second particle size, and the height is the stacking height of the limestone on the lower arch bridge; If the volume of the first particle size of limestone in the sleeve kiln is less than a preset volume threshold, the sleeve kiln is controlled to be ignited and heated at a preset heating rate until the temperature of the lower combustion chamber reaches the preset first temperature threshold, and the output of the sleeve kiln is increased to the target output according to the preset production increase method.
2. The kiln baking method of claim 1, wherein: After adding the limestone of the first particle size into the sleeve kiln at a preset feeding speed and before stopping adding the limestone of the first particle size into the sleeve kiln, the method further comprises: If the height of the limestone of the first particle size reaches a preset second height threshold, controlling the sleeve kiln to discharge at a preset second discharge speed; The first height threshold is greater than the second height threshold, and the first discharge speed is greater than the second discharge speed.
3. The kiln baking method of claim 1, wherein: The heating at a preset heating rate includes: If the temperature of the lower combustion chamber is lower than a preset second temperature threshold, heating the lower combustion chamber at a preset first heating rate; If the temperature of the lower combustion chamber is greater than or equal to the second temperature threshold and less than a preset third temperature threshold, heating is performed at a preset second heating rate; the first heating rate is less than the second heating rate; If the temperature of the lower combustion chamber is greater than or equal to the third temperature threshold and less than the first temperature threshold, the temperature is increased at a preset third temperature increase rate; the second temperature increase rate is less than the third temperature increase rate.
4. The kiln baking method of claim 3, wherein: The third heating rate is less than a preset heating rate threshold.
5. The kiln baking method of claim 1, wherein: Increasing the output of the sleeve kiln to the target output according to a preset production increase method includes: If the output is less than a preset first output threshold, the output is increased at a preset first output increase rate, and when the output reaches the first output threshold, the output increase is stopped, and after a preset first time period, the output is continued to be increased at a preset second output increase rate; When the output reaches a preset second output threshold, the output increase is stopped, and after a preset second period of time, the output is continued to be increased to the target output at a preset third output increase speed; The second production threshold is greater than the first production threshold.
6. The kiln baking method of claim 1, wherein: The first particle size is between 5 and 30 mm, and the second particle size is between 30 and 80 mm.
7. The kiln baking method of claim 1, wherein: The sleeve kiln includes a gas pipeline. After the volume of the limestone of the first particle size in the sleeve kiln is less than a preset volume threshold and before controlling the ignition of the sleeve kiln, the method further includes: Nitrogen is blown into the gas pipeline to reduce the oxygen content in the gas pipeline.
8. A kiln drying device for a sleeve kiln, characterized in that: The sleeve kiln comprises a lower arch bridge and a lower combustion chamber, and the device comprises: A feeding module, used for feeding limestone of a first particle size into the sleeve kiln at a preset feeding speed; a first control module, configured to stop feeding the limestone of the first particle size into the sleeve kiln and feed the limestone of the second particle size into the sleeve kiln if the height of the limestone of the first particle size reaches a preset first height threshold, and control the sleeve kiln to discharge the limestone at a preset first discharge speed; the first discharge speed is lower than the feeding speed, the first particle size is lower than the second particle size, and the height is the stacking height of the limestone on the lower arch bridge; The second control module is used to control the ignition of the sleeve kiln and to increase the temperature at a preset heating rate if the volume of the first particle size of the limestone in the sleeve kiln is less than a preset volume threshold, until the temperature of the lower combustion chamber reaches a preset first temperature threshold, and then increase the output of the sleeve kiln to the target output according to a preset production increase method.
9. An electronic device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method according to any one of claims 1 to 7 by executing the computer instructions.
10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the method according to any one of claims 1 to 7.