A device for preparing clinker by using multi-stage preheating of rotary kiln tail gas

Abstract

The utility model discloses a kind of device for preparing clinker by rotary kiln tail gas multistage preheating, it is related to cement production technical field.The utility model includes finished product homogenizing bin, heating jacket and annular pipe, annular pipe is arranged in lower part in finished product homogenizing bin, and the inner ring of annular pipe is fixedly connected with jet pipe in annular array, and heating jacket is arranged in the lower portion of finished product homogenizing bin, and heating pipe is fixed in heating jacket and is vertically through, and the inner wall of heating pipe is fixed with heat exchange plate in annular array.The utility model is equipped with finished product homogenizing bin, heating jacket and annular pipe, solve the problem that preheating is not enough to cement raw material in the process of rotary kiln flue gas preheating cement raw material, and hot flue gas flow disturbance caused by blowing leads to uneven material distribution, affect cement conveying uniformity, the utility model has the advantages that:preheating is more sufficient to cement raw material in the process of rotary kiln flue gas preheating cement raw material, and hot flue gas can further mix cement raw material transported, increase material conveying uniformity.

Description

Technical Field

[0001] This utility model belongs to the field of cement production technology, and in particular relates to a device for preparing clinker by multi-stage preheating of rotary kiln tail gas. Background Technology

[0002] Rotary kilns are mainly used for calcining, roasting, drying, or pyrolysis of solid materials. Their core structure is an inclined, rotatable steel cylinder lined with refractory material to withstand high temperatures (typically 1200-1800℃). The cylinder is driven by a motor to rotate slowly (0.5-5 rpm), and the material is moved from the high end (kiln tail) to the low end (kiln head) by a 2-5° inclination angle. During this process, the material comes into direct or indirect contact with the high-temperature flue gas, undergoing stages such as drying, preheating, decomposition, and calcination, ultimately completing a physical or chemical reaction. Therefore, in cement clinker production, raw cement meal needs to be calcined in a rotary kiln to prepare clinker. The exhaust gas from the rotary kiln is directly discharged through an exhaust system during operation. Directly discharging the high-temperature flue gas not only causes thermal pollution but also wastes energy due to the direct loss of heat. By conveying the exhaust gas to a raw meal conveying system, the raw meal can be preheated, reducing the rotary kiln's energy consumption. However, rotary kilns still have the following drawbacks in practical use:

[0003] In the process of preheating cement raw meal with rotary kiln flue gas, the raw meal is preheated by blowing it directly into the raw meal preparation device in one step. However, blowing hot flue gas in one step will result in insufficient residual heat in the raw meal, which will affect the preheating effect of cement raw meal.

[0004] In clinker production, hot flue gas is blown directly into the equipment that conveys cement raw materials. However, during the conveying process, direct blowing will cause the cement raw materials to be scattered, affecting the uniformity of the conveying of raw materials and reducing the quality of the finished cement product. Utility Model Content

[0005] The purpose of this invention is to provide a device for preparing clinker by multi-stage preheating of rotary kiln tail gas. By setting up a finished product homogenization bin, a heating jacket and an annular pipe, it solves the problems of insufficient preheating of cement raw meal during the preheating process of rotary kiln flue gas, and uneven material distribution caused by the disturbance of the hot flue gas flow, which affects the uniformity of cement conveying.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0007] This invention relates to a device for preparing clinker using multi-stage preheating of rotary kiln exhaust gas. The device includes a finished product homogenization chamber, a heating jacket, and an annular pipe. The annular pipe is located at the lower part of the finished product homogenization chamber. Air jets are fixedly connected to the inner ring of the annular pipe in a circular array. The heating jacket is located below the finished product homogenization chamber. Heating pipes are vertically fixed inside the heating jacket, and heat exchange plates are fixedly fixed to the inner wall of the heating pipes in a circular array. During operation, ground cement raw materials are transported through the finished product homogenization chamber. As the cement raw materials pass through the finished product homogenization chamber, hot flue gas from the rotary kiln passing through the annular pipe is injected into the finished product homogenization chamber through the air jets. After preheating in the homogenization chamber, the gas is transported to the heating pipes inside the heating jacket, allowing the cement raw materials to be further and fully heated by the heating pipes.

[0008] Furthermore, the top of the finished product homogenization silo is fixedly connected to a feed pipe, and the bottom of the finished product homogenization silo is fixedly connected to a collection hopper. Raw material enters the homogenization silo from the vertical mill through the feed pipe, and the bottom collection hopper collects the preheated material.

[0009] Furthermore, the bottom end of the centralized hopper is fixedly connected to an output pipe, and the bottom end of the output pipe is fixedly connected to the top end of the heating pipe. The centralized hopper sends raw materials into the heating pipe for deep heating through the output pipe.

[0010] Furthermore, a spiral heat exchange plate is fixed around the heating tube, the spiral heat exchange plate is disposed inside the heating jacket, and an insulation sleeve is fixed around the heating jacket. The heating tube is provided with a spiral heat exchange plate inside the heating jacket, and the outer layer is wrapped with an insulation sleeve to achieve efficient heat exchange.

[0011] Furthermore, an air inlet pipe is fixedly connected to the upper periphery of the heating jacket, and an air outlet pipe is fixedly connected to the lower periphery of the heating jacket. Both the air inlet pipe and the air outlet pipe pass through the insulation jacket. The hot flue gas from the rotary kiln enters the heating jacket from the air inlet pipe, and after heat exchange, it is discharged from the air outlet pipe, forming a complete heat cycle.

[0012] Furthermore, the jet pipe is inclined upwards, and the top end of the annular pipe is fixedly connected to a gas conveying pipe. The top end of the gas conveying pipe passes through the top end of the finished product homogenization bin and extends out. The hot flue gas from the rotary kiln enters the annular pipe through the gas conveying pipe and is injected into the homogenization bin through the inclined jet pipe to preheat the raw material evenly.

[0013] This utility model has the following beneficial effects:

[0014] This invention solves the problem of insufficient preheating of cement raw materials during the preheating process of rotary kiln flue gas by setting up a finished product homogenization bin, a heating jacket, and an annular pipe. The feed pipe transports the material to the finished product homogenization bin. As the material passes through the finished product homogenization bin, the hot flue gas from the rotary kiln entering the annular pipe is output to the finished product homogenization bin through the jet pipe. The material is then transported to the finished product homogenization bin and blown onto the cement raw materials passing through the finished product homogenization bin, thus initially heating the cement raw materials. The cement raw materials are then transported to a collection hopper, and after being collected in the collection hopper, they are transported to an output pipe and output to a heating pipe. As the cement raw materials pass through the heating pipe, the flue gas is transported to the heating jacket through the air inlet pipe. After further heat exchange on the spiral heat exchange plates around the heating pipe, the heat is transferred to the heating jacket and further transferred to the heating pipe for heat dissipation through the heat exchange plates. At the same time, the insulation jacket around the heating jacket keeps it warm. Through two-step preheating, the preheating of cement raw materials during the preheating process of rotary kiln flue gas is more thorough.

[0015] This invention solves the problem of uneven material distribution caused by airflow disturbance during the preheating of cement raw materials by rotary kiln flue gas, which affects the uniformity of cement conveying, by setting up a finished product homogenization bin and an annular pipe. The hot flue gas from the rotary kiln is transported to the annular pipe through the gas delivery pipe, and then to the jet pipe through the annular pipe. In the jet pipe, it is sprayed into the finished product homogenization bin, which evenly disperses and heats the cement raw materials passing through the finished product homogenization bin, so that the cement raw materials are fully preheated and evenly mixed. This allows the hot flue gas to be blown during the preheating of cement raw materials by rotary kiln flue gas to further mix the conveyed cement raw materials, ensuring the uniformity of cement raw material conveying. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional view of a device for preparing clinker by multi-stage preheating of rotary kiln tail gas after partial cross-section.

[0018] Figure 2 This is a three-dimensional structural diagram of the finished product homogenization silo.

[0019] Figure 3 This is a three-dimensional view of the heating jacket section after it has been cut open.

[0020] Figure 4 This is a three-dimensional structural diagram of a ring-shaped tube;

[0021] Figure 5This is a three-dimensional view of the assembly structure of a device for preparing clinker using multi-stage preheating of rotary kiln tail gas.

[0022] Figure label:

[0023] 1. Finished product homogenization silo; 101. Feed pipe; 102. Concentrated hopper; 103. Output pipe; 2. Heating jacket; 201. Heating tube; 202. Heat exchange plate; 203. Spiral heat exchange plate; 204. Insulation jacket; 205. Air inlet pipe; 206. Exhaust pipe; 3. Annular pipe; 301. Jet nozzle; 302. Gas delivery pipe. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model. Specific Implementation Example 1

[0025] Please see Figure 1-5 This utility model relates to a device for preparing clinker using multi-stage preheating of rotary kiln exhaust gas. It includes a finished product homogenization bin 1, a heating jacket 2, and an annular pipe 3. The annular pipe 3 is located in the lower part of the finished product homogenization bin 1. The finished product homogenization bin 1 conveys ground cement raw materials, which are then fed into it via jet pipes 301 through the annular pipe 3. The inner ring of the annular pipe 3 is fixedly connected to the jet pipes 301 in a circular array. The jet pipes 301 blow out the hot flue gas from the rotary kiln entering the annular pipe 3 and deliver it to the finished product homogenization bin 1, preheating the raw materials passing through the bin 1 and homogenizing the finished product. A heating jacket 2 is installed below the silo 1. The hot flue gas from the rotary kiln passes through the heating jacket 2 and further heats the raw material passing through the heating pipe 201. The heating pipe 201 is vertically fixed inside the heating jacket 2. The bottom end of the heating pipe 201 is fixedly connected to the conveying pipeline of the rotary kiln, which conveys the preheated cement raw material to the rotary kiln. Heat exchange plates 202 are fixed in a ring array on the inner wall of the heating pipe 201. When the raw material is conveyed into the heating pipe 201, it is further heated by heat exchange through the heat exchange plates 202. After further heating, it is output to the next production equipment.

[0026] Specifically, the top of the finished product homogenization silo 1 is fixedly connected to a feed pipe 101, the top of which is connected to the output end of the raw material vertical mill. The bottom of the finished product homogenization silo 1 is fixedly connected to a collection hopper 102. Cement raw materials are transported from the raw material vertical mill through the feed pipe 101 to the upper part of the finished product homogenization silo 1 and evenly distributed inside the silo. The bottom of the homogenization silo is connected to the collection hopper 102, which is used to collect the cement raw materials that have undergone preliminary preheating.

[0027] Furthermore, the bottom end of the centralized hopper 102 is fixedly connected to the output pipe 103, and the bottom end of the output pipe 103 is fixedly connected to the top end of the heating pipe 201. The output pipe 103 at the bottom of the centralized hopper 102 transports the preheated cement raw material to the heating pipe 201, forming a closed material channel. The output pipe 103 is directly connected to the heating pipe 201 to avoid heat loss and ensure that the raw material smoothly enters the deep heating stage.

[0028] Furthermore, a spiral heat exchange plate 203 is fixed around the heating tube 201. The spiral heat exchange plate 203 is disposed inside the heating jacket 2. An insulation sleeve 204 is fixed around the heating jacket 2. The outer wall of the heating tube 201 is provided with the spiral heat exchange plate 203 and installed inside the heating jacket 2. The heating jacket 2 is wrapped with the insulation sleeve 204. The spiral heat exchange plate 203 increases the heat exchange area, so that the heat of the high-temperature flue gas is efficiently transferred to the raw material inside the heating tube 201. The insulation sleeve 204 reduces the heat loss to the external environment and improves the thermal energy utilization rate.

[0029] Furthermore, an air inlet pipe 205 is fixedly connected to the upper periphery of the heating jacket 2, and an exhaust pipe 206 is fixedly connected to the lower periphery of the heating jacket 2. Both the air inlet pipe 205 and the exhaust pipe 206 pass through the insulation jacket 204. The end of the air inlet pipe 205 away from the heating jacket 2 is connected to the equipment for conveying hot flue gas from the rotary kiln, and the exhaust pipe 206 is connected to the flue gas emission equipment. The high-temperature flue gas enters the heating jacket 2 through the air inlet pipe 205 and flows from top to bottom through the spiral heat exchange plate 203. After the heat is absorbed, the cooled flue gas is discharged from the exhaust pipe 206. Both the air inlet pipe 205 and the exhaust pipe 206 pass through the insulation jacket 204 to ensure the system's airtightness and maintain a stable heat exchange process.

[0030] The operation process of this embodiment is as follows: During operation, the feed pipe 101 transports the material to the finished product homogenization bin 1. When passing through the finished product homogenization bin 1, the hot flue gas from the rotary kiln entering the annular pipe 3 is output to the finished product homogenization bin 1 through the jet pipe 301. It is transported to the finished product homogenization bin 1 and blown onto the cement raw material passing through the finished product homogenization bin 1, and the cement raw material is initially heated. Then, the cement raw material is transported to the collection hopper 102. After being collected by the collection hopper 102, it is transported to the output pipe 103 and output to the heating pipe 201 through the output pipe 103. When the cement raw material passes through the heating pipe 201, the flue gas is transported to the heating jacket 2 through the air inlet pipe 205. After further heat exchange by the spiral heat exchange plates 203 around the heating pipe 201, the heat is transferred to the heating jacket 2 and further transferred to the heating pipe 201 through the heat exchange plate 202 for heat dissipation. At the same time, the insulation jacket 204 around the heating jacket 2 keeps it warm. Specific Implementation Example 2

[0031] Please see Figure 1 , 24. Based on the specific embodiment one, the jet pipe 301 is set at an angle upward, and the top end of the annular pipe 3 is fixedly connected to the gas conveying pipe 302. The top end of the gas conveying pipe 302 passes through the top end of the finished product homogenization bin 1 and extends out. The top end of the gas conveying pipe 302 is connected to the conveying pipeline of the rotary kiln hot flue gas. The rotary kiln hot flue gas enters the annular pipe 3 through the gas conveying pipe 302, and then is sprayed into the finished product homogenization bin 1 at an angle upward through the jet pipe 301. The angled design of the jet pipe 301 enhances the blowing effect on cement raw materials, so that the rotary kiln hot flue gas and raw materials can fully contact each other, achieve uniform preheating, and at the same time prevent material accumulation and improve preheating efficiency.

[0032] The operation process of this embodiment is as follows: During operation, the hot flue gas of the rotary kiln is transported to the annular pipe 3 through the gas supply pipe 302, and then to the jet pipe 301 through the annular pipe 3. The gas is then sprayed out into the finished product homogenization bin 1 through the jet pipe 301, which evenly disperses and heats the cement raw materials passing through the finished product homogenization bin 1, so that the cement raw materials are fully preheated and mixed evenly.

[0033] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0034] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An apparatus for preparing clinker using multi-stage preheating of rotary kiln tail gas, comprising a finished product homogenization bin (1), a heating jacket (2), and an annular pipe (3), characterized in that: The lower part of the finished product homogenization chamber (1) is provided with an annular pipe (3), and the inner ring of the annular pipe (3) is fixedly connected with a jet pipe (301) in an annular array. The bottom of the finished product homogenization chamber (1) is provided with a heating jacket (2), and a heating pipe (201) is fixedly fixed vertically inside the heating jacket (2). The inner wall of the heating pipe (201) is fixed with a heat exchange plate (202) in an annular array.

2. The apparatus for preparing clinker using multi-stage preheating of rotary kiln tail gas according to claim 1, characterized in that: The top of the finished product homogenization bin (1) is fixedly connected to a feed pipe (101), and the bottom of the finished product homogenization bin (1) is fixedly connected to a collection hopper (102).

3. The apparatus for preparing clinker using multi-stage preheating of rotary kiln tail gas according to claim 2, characterized in that: The bottom end of the concentration hopper (102) is fixedly connected to an output pipe (103), and the bottom end of the output pipe (103) is fixedly connected to the top end of the heating pipe (201).

4. The apparatus for preparing clinker using multi-stage preheating of rotary kiln tail gas according to claim 1, characterized in that: The heating tube (201) is fixed with a spiral heat exchange plate (203) on its periphery. The spiral heat exchange plate (203) is arranged inside the heating sleeve (2). The heating sleeve (2) is fixed with a heat insulation sleeve (204) on its periphery.

5. The apparatus for preparing clinker using multi-stage preheating of rotary kiln tail gas according to claim 4, characterized in that: The upper part of the heating sleeve (2) is fixedly connected to an air inlet pipe (205), and the lower part of the heating sleeve (2) is fixedly connected to an exhaust pipe (206). Both the air inlet pipe (205) and the exhaust pipe (206) pass through the insulation sleeve (204).

6. The apparatus for preparing clinker using multi-stage preheating of rotary kiln tail gas according to claim 1, characterized in that: The jet pipe (301) is inclined upward, and the top end of the annular pipe (3) is fixedly connected to the gas delivery pipe (302). The top end of the gas delivery pipe (302) passes through the top end of the finished product homogenization chamber (1) and extends out.

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