Double-chamber lime kiln with multiple unloading platforms

Abstract

The present application belongs to the technical field of chemical material production equipment, and in particular to a double-chamber lime kiln with multiple unloading platforms. By setting an upper unloading platform in each kiln chamber to divide each kiln chamber into upper and lower sections, the upper unloading platform can bear about 50% of the material load, and the lower unloading platform can bear 50% of the material load, thus changing the situation where the material load is simply carried by the lower unloading platform. Since the pressure on the unloading platform at the bottom of the kiln body is effectively reduced, the design and construction of a large-capacity double-chamber lime kiln becomes possible.

Description

Technical Field

[0001] The present application belongs to the technical field of chemical material production equipment, and in particular relates to a double-chamber lime kiln with multiple unloading platforms. Background Art

[0002] The full name of the double-chamber lime kiln is the double-chamber parallel flow regenerative lime kiln. The double-chamber lime kiln is an advanced lime calcining equipment with two vertical kiln chambers. A connecting channel is provided in the middle and lower part of the kiln body to connect the two kiln chambers. The calcining process of the double-chamber lime kiln has two major characteristics: parallel flow and heat storage. Parallel flow means that when limestone is calcined, the combustion products and limestone flow downward together, which is conducive to calcining high-quality active lime. Heat storage means that when calcining in one kiln chamber, the high-temperature flue gas enters the other kiln chamber through the connecting channel in the middle and lower part of the kiln chamber. After entering the other kiln chamber, the high-temperature flue gas flows upward, preheating the limestone in the preheating zone to a higher temperature, and storing the heat of the flue gas in the preheating zone of the other kiln chamber. The flue gas passing through the other kiln chamber drops to a very low temperature and is discharged. The two kiln chambers of the double-chamber lime kiln alternately calcine and store heat, making full use of the waste heat of the flue gas and having a high thermal efficiency. The thermal characteristics of parallel calcination and countercurrent heat storage determine that the double-chamber lime kiln has a high thermal efficiency. Its heat energy consumption is the lowest among all types of lime kilns such as rotary kilns and sleeve kilns. The total heat consumption of lime production is less than 3.5GJ per ton of lime. The double-chamber lime kiln is conducive to calcining small-particle limestone materials and producing good quality lime.

[0003] The output of an ordinary double-chamber lime kiln is 300-600 tons per day. With the progress of science and technology and economic society, there is an increasing demand to expand the scale of production and increase production volume to meet the needs of economic development and construction. Summary of the invention

[0004] In view of this, an embodiment of the present application provides a double-chamber lime kiln with multiple unloading platforms to solve the problem of limited production of ordinary double-chamber kilns.

[0005] The embodiment of the present application provides a double-chamber lime kiln with multiple unloading platforms, including a first kiln chamber and a second kiln chamber, wherein a preheating section, a calcining section and a cooling section are respectively arranged from top to bottom in the first kiln chamber and the second kiln chamber, and an insert burner is respectively arranged in the first kiln chamber and the second kiln chamber, and a connecting passage is arranged between the first kiln chamber and the second kiln chamber. An upper unloading platform and a lower unloading platform are arranged in the first kiln chamber, and an upper unloading platform and a lower unloading platform are arranged in the second kiln chamber; the upper unloading platform is located below the insert burner of the corresponding kiln chamber and above the connecting passage; the lower unloading platform is arranged at the lower part of the cooling section of the corresponding kiln chamber.

[0006] Specifically, two or more upper unloading platforms may be arranged at any suitable position above the lower unloading platform.

[0007] Specifically, the upper unloading platform and the lower unloading platform adopt a diagonal discontinuous material pushing unloading structure.

[0008] Specifically, the upper unloading platform is provided with a cooling device.

[0009] Specifically, in order to ensure the service life of the upper unloading platform in the high temperature zone, the upper unloading platform is provided with a wind-cooled cooling device, and the wind-cooled cooling device adopts an inner sleeve structure; the upper unloading platform includes a support body, a support roller, a moving body, a lower steel plate and an upper steel plate arranged in sequence from bottom to top; a plurality of support columns are arranged between the lower steel plate and the upper steel plate, and a cooling air channel is formed between the lower steel plate and the upper steel plate; refractory materials are arranged on the inner side and / or outer side of the cooling air channel, and the refractory materials are brick masonry or casting materials; refractory materials are arranged on the outer walls of the lower steel plate, the upper steel plate and the support columns; protective plates are arranged on the outer sides of the support body, the support roller and the moving body, and refractory materials are arranged on the outer walls of the protective plates. The upper unloading platform with an inner sleeve structure allows materials to pass through and allows the gas in the kiln chamber to pass through in both directions.

[0010] Specifically, heat transfer oil is used to cool part or all of the components constituting the upper unloading platform.

[0011] Specifically, other equipment with the same or similar functions is used to replace the upper unloading platform and the lower unloading platform.

[0012] The double-chamber lime kiln with multiple unloading platforms provided in the embodiment of the present application uses an upper unloading platform to divide each kiln chamber into two sections, an upper unloading platform, so that the upper unloading platform can bear about 50% of the material load, and the lower unloading platform can bear 50% of the material load, which changes the situation of relying solely on the lower unloading platform to bear the material load. Since the pressure of the unloading platform located at the bottom of the kiln body is effectively reduced, the design and construction of a large-capacity double-chamber lime kiln is possible, and the strength and stability of the large-capacity double-chamber lime kiln are improved. In addition, by arranging an upper unloading platform in each kiln chamber, the materials in the kiln chamber can be separated, and the lime at the bottom bears half of the pressure, which can effectively reduce the powder ash rate of the lime product and improve the performance of the lime product. The upper unloading platform can rearrange the distribution of the high-temperature airflow in the kiln chamber, improve the kiln chamber temperature field, and improve the quality of calcined lime. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0014] Figure 1 is a schematic diagram of a double-chamber lime kiln with multiple unloading platforms provided in an embodiment of the present application;

[0015] Figure 2 It is a structural diagram of the unloading platform;

[0016] Figure 3 yes Figure 2 Sectional view in the AA direction;

[0017] Figure 4 yes Figure 2 Cross-sectional view along the BB direction.

[0018] Among them: 1—first kiln chamber, 2—second kiln chamber, 3—preheating section, 4—calcining section, 5—cooling section, 6—connecting channel, 7—upper unloading platform, 8—lower unloading platform, 1001—support body, 1002—support roller, 1003—moving body, 1004—lower steel plate, 1005—upper steel plate, 1006—support column, 1007—cooling air channel, 1008—protective plate. Implementation

[0019] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0020] In order to illustrate the technical solution described in this application, a specific embodiment is provided below for illustration.

[0021] The present application provides a double-chamber lime kiln with multiple unloading platforms for calcining lime. Figure 1 As shown, the double-chamber lime kiln comprises a first kiln chamber 1 and a second kiln chamber 2. A preheating section 3, a calcining section 4 and a cooling section 5 are respectively arranged in the first kiln chamber 1 and the second kiln chamber 2 from top to bottom. Insertion burners are respectively arranged in the first kiln chamber 1 and the second kiln chamber 2. A connecting passage 6 is arranged between the first kiln chamber 1 and the second kiln chamber 2.

[0022] An upper unloading platform 7 and a lower unloading platform 8 are provided on the first kiln chamber 1, and an upper unloading platform 7 and a lower unloading platform 8 are provided on the second kiln chamber 2. The upper unloading platform 7 is located below the plug-in burner of the corresponding kiln chamber and above the connecting passage 6. The lower unloading platform 8 is provided at the lower part of the cooling section of the corresponding kiln chamber. Both the upper unloading platform 7 and the lower unloading platform 8 adopt a material unloading structure including but not limited to diagonal intermittent pushing, and the material can pass downward through the upper unloading platform 7 and the lower unloading platform 8, the smoke in the kiln chamber can pass through the upper unloading platform 7 in both directions, and the lime cooling wind can pass through the lower unloading platform 8.

[0023] The upper unloading platform 7 is in a high temperature working environment, and a corresponding cooling device needs to be provided. In order to ensure the service life of the upper unloading platform 7 in the high temperature zone, a cooling device including but not limited to air cooling or oil cooling can be provided in the upper unloading platform 7.

[0024] The air-cooled cooling device adopts an inner sleeve structure. Carbon dioxide, nitrogen or air are selected as cooling wind to cool the upper unloading platform. The cooling wind enters the inner sleeve structure of the upper unloading platform 7, thereby air-cooling the metal parts of the upper unloading platform 7. The high-temperature gas discharged from the upper unloading platform 7 can directly enter the kiln chamber as combustion-supporting wind, enter from the upper part of the kiln chamber and be heated again in the kiln chamber for combustion; or, the high-temperature gas discharged from the upper unloading platform 7 can be used to preheat the low calorific value fuel in a separately configured heat exchanger, and the heated low calorific value fuel enters the burner to burn and calcine the material.

[0025] like Figure 2 , Figure 3 and Figure 4 As shown, the upper unloading platform 7 includes a support body 1001, a support roller 1002, a moving body 1003, a lower steel plate 1004 and an upper steel plate 1005, which are arranged in sequence from bottom to top. A plurality of support columns 1006 are arranged between the lower steel plate 1004 and the upper steel plate 1005 to form a fixed structure and separate the upper and lower steel plates. A cooling air channel 1007 is formed between the lower steel plate 1004 and the upper steel plate 1005. Refractory materials can be added inside and outside the cooling air channel 1007, and the refractory materials can be brick masonry or casting materials. Refractory materials can be arranged on the outer walls of the lower steel plate 1004, the upper steel plate 1005 and the support columns 1006. A protective plate 1008 is arranged on the outer side of the support body 1001, the support roller 1002 and the moving body 1003, and a refractory material is arranged on the outer wall of the protective plate 1008.

[0026] The support body 1001 is used to support the entire unloading platform. The lower steel plate 1004 and the upper steel plate 1005 are mainly used for bearing weight, supporting the upper preheating bin and the raw materials in the preheating bin. The moving body 1003 can move linearly by using the support roller 1002 and its corresponding track, so that the unloading platform forms an opening for unloading. The support body 1001 and the moving body 1003 can be made of heat-resistant steel, such as I-beam. The protective plate 1008 arranged on the outside of the support body 1001 and the moving body 1003 can form an air inlet and an air outlet with the I-beam. The protective plate 1008 arranged on the outside of the support roller 1002 can form an air duct. The cooling air passes through the moving body 1003 and the support roller 1002 in turn, and is finally discharged from the support body 1001. By continuously blowing cooling air to each air duct formed by the protective plate, the support body 1001, the support roller 1002 and the moving body 1003 can be effectively cooled by air, ensuring their normal operation in a high temperature environment.

[0027] The upper unloading platform 7 and the lower unloading platform 8 both adopt a diagonal discontinuous pushing material unloading structure. In order to ensure the service life of the upper unloading platform 7 in the high temperature area, the upper unloading platform 7 adopts an inner sleeve structure, and each air duct formed by the interlayer can protect the unloading platform from high temperature and improve the service life. Figures 2 to 4 The arrows in the figure show the flow direction of the cooling air in the interlayer of the upper unloading platform.

[0028] The upper unloading platform of the inner sleeve structure allows the material to pass through and the gas in the kiln chamber to pass in both directions. Other equipment with the same or similar functions can be used to replace the unloading platform. For part or all of the components constituting the upper unloading platform, other cooling methods including but not limited to heat transfer oil can be used for cooling.

[0029] The upper unloading platform divides each kiln chamber into two sections, the upper and lower sections. The main advantages of arranging the upper unloading platform are:

[0030] 1. Separate the materials in the kiln chamber, and the lime at the bottom will bear half of the pressure, which can effectively reduce the powder ash rate of the finished lime product;

[0031] 2. When the lime output increases, that is, when the kiln chamber material increases, the upper unloading platform bears about 50% of the load, and the lower unloading platform bears 50% of the load, reducing the pressure on the lower unloading platform;

[0032] 3. The upper unloading platform can be used to rearrange the distribution of high-temperature airflow in the kiln chamber, improve the temperature field in the kiln chamber, and improve the quality of calcined lime.

[0033] In actual production, two or more upper unloading platforms can be set in each kiln chamber according to production requirements, and the upper unloading platforms are all located above the lower unloading platform.

[0034] The operation process of the double-chamber lime kiln provided in the embodiment of the present application is as follows:

[0035] When the first kiln chamber 1 is calcining and the second kiln chamber 2 is storing heat, the material carried by the upper unloading platform 7 in the first kiln chamber 1 is in a calcining state, and the high-temperature flue gas generated by the calcination passes through the upper unloading platform 7 of the first kiln chamber 1 and enters the second kiln chamber 2 along the connecting channel 6. After passing through the upper unloading platform 7 of the second kiln chamber 2, it runs upward in the second kiln chamber 2 to preheat the material in the second kiln chamber. After the material is preheated, the flue gas is discharged from the top of the second kiln chamber.

[0036] After the reversal, the second kiln chamber 2 is calcined and the first kiln chamber 1 is storing heat. The material carried on the upper unloading platform 7 in the second kiln chamber 2 is in a calcined state. The high-temperature flue gas generated by the calcination passes through the upper unloading platform 7 of the second kiln chamber 2 and enters the first kiln chamber 1 along the connecting channel 6. After passing through the upper unloading platform 7 of the first kiln chamber 1, it runs upward in the first kiln chamber 1 to preheat the material in the first kiln chamber. After preheating the material, the flue gas is discharged from the top of the first kiln chamber.

[0037] The first kiln chamber 1 and the second kiln chamber 2 perform calcination and heat storage in turn.

[0038] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A double-chamber lime kiln with multiple unloading platforms, comprising: A first kiln chamber (1) and a second kiln chamber (2), wherein a preheating section (3), a calcining section (4) and a cooling section (5) are respectively arranged in the first kiln chamber (1) and the second kiln chamber (2) from top to bottom, an insert burner is respectively arranged in the first kiln chamber (1) and the second kiln chamber (2), and a connecting passage (6) is arranged between the first kiln chamber (1) and the second kiln chamber (2), characterized in that an upper unloading platform (7) and a lower unloading platform (8) are arranged in the first kiln chamber (1), and an upper unloading platform (7) and a lower unloading platform (8) are arranged in the second kiln chamber (2); the upper unloading platform (7) is located below the insert burner of the corresponding kiln chamber and above the connecting passage (6); the lower unloading platform (8) is arranged at the lower part of the cooling section of the corresponding kiln chamber; the upper unloading platform (7) is provided with a cooling device, and the cooling device is an air-cooled cooling device, and the air-cooled cooling device adopts an inner sleeve structure; the upper unloading platform (7) includes The invention comprises a support body (1001), a support roller (1002), a moving body (1003), a lower steel plate (1004) and an upper steel plate (1005) which are arranged in sequence from bottom to top; a plurality of support columns (1006) are arranged between the lower steel plate (1004) and the upper steel plate (1005); a cooling air channel (1007) is formed between the lower steel plate (1004) and the upper steel plate (1005); and a cooling air channel (1007) is formed on the inner side and / or the inner side of the cooling air channel (1007). Or refractory materials are arranged on the outside, and the refractory materials are brick masonry or casting materials; refractory materials are arranged on the outer walls of the lower steel plate (1004), the upper steel plate (1005) and the support column (1006); a protective plate (1008) is arranged on the outer side of the support body (1001), the support roller (1002) and the moving body (1003), and the outer wall of the protective plate (1008) is provided with refractory materials; the upper unloading platform (7) of the inner sleeve structure allows materials to pass through and allows the gas in the kiln chamber to pass through in both directions.

2. The double-chamber lime kiln with multiple unloading platforms as claimed in claim 1, characterized in that: Two or more upper unloading platforms (7) are arranged above the lower unloading platform (8).

3. The double-chamber lime kiln with multiple unloading platforms as claimed in claim 2, characterized in that: The upper unloading platform (7) and the lower unloading platform (8) adopt a diagonal discontinuous material pushing unloading structure.

4. The double-chamber lime kiln with multiple unloading platforms as claimed in claim 1, characterized in that: Heat transfer oil is used to cool part or all of the components constituting the upper unloading platform (7).

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