Kiln head waste heat calcination system

Abstract

This utility model relates to the field of waste heat utilization equipment technology, and provides a kiln head waste heat calcination system, including: a high-temperature molten finished product material bin, an air supply and heat exchange device, and a heating chamber. The high-temperature molten finished product material bin is configured to connect with the outlet of the calcining kiln to receive the high-temperature molten finished product material and high-temperature waste heat produced by the calcining kiln. The air supply and heat exchange device is connected to the high-temperature molten finished product material bin, and is used to supply air to the high-temperature molten finished product material bin and form heat exchange with the material in the upper heating chamber, accelerating the waste heat conversion and utilization efficiency. The heating chamber is used to hold the material to be heated and is connected to the high-temperature molten finished product material bin so that hot air from the high-temperature molten finished product material bin enters the heating chamber. The kiln head waste heat calcination system of this utility model utilizes the diffused heat, radiant heat and waste heat of the produced material during the production operation of the calcining kiln, greatly improving the waste heat utilization efficiency of the system.

Description

Technical Field

[0001] This utility model relates to the field of waste heat utilization equipment technology, and in particular to a kiln head waste heat calcination system. Background Technology

[0002] In related technologies, rotary kilns are typically used for calcination heat treatment of materials such as ceramsite and cement. During the heat treatment process, the furnace temperature of the rotary kiln is relatively high, and the temperature of the heated ceramsite, cement, and other materials is also relatively high. These materials need to be cooled before use, resulting in a significant waste of heat and low overall thermal efficiency of the rotary kiln. Utility Model Content

[0003] This invention provides a waste heat calcination system for the kiln head, which solves the problem of low thermal efficiency in existing rotary kilns.

[0004] This utility model provides a kiln head waste heat calcination system, comprising:

[0005] A high-temperature molten finished product silo is configured to connect to the outlet of a calcining kiln to receive high-temperature molten finished products, such as ceramsite, from the calcining kiln;

[0006] An air supply and heat exchange device is connected to the high-temperature molten finished product material silo and is used to supply air to the high-temperature molten finished product material silo.

[0007] A heating chamber is used to hold the material to be heated and is connected to the high-temperature molten finished product material chamber to receive hot air from the high-temperature molten finished product material chamber;

[0008] The high-temperature molten finished product material silo, the air supply and heat exchange device, the outlet of the calcining kiln, and the heating chamber are all located in an integrally enclosed box-type silo with heat preservation function.

[0009] According to the kiln head waste heat calcination system of this utility model, the high-temperature molten finished product material bin includes:

[0010] The buffer compartment is configured to communicate with the outlet of the calcining kiln and is provided with a first discharge port; the first discharge port is provided with a first valve, which is used to adjust the opening degree of the first discharge port;

[0011] A heat absorption chamber is located below the buffer chamber and is connected to the first discharge port; the heat absorption chamber is provided with a second discharge port, which is used to discharge the high-temperature molten finished material; the heat absorption chamber is connected to the heating chamber and the air supply and heat exchange device respectively; the second discharge port is provided with a second valve, which is used to adjust the opening of the second discharge port.

[0012] According to the waste heat calcination system of the kiln head of this utility model, there are multiple heat absorption chambers; the buffer chamber has multiple first discharge ports, and the heat absorption chambers and the first discharge ports are connected in a one-to-one correspondence.

[0013] According to the waste heat calcination system at the kiln head of this utility model, the buffer chamber includes a cylindrical body and a tapered body that are connected to each other.

[0014] The cylindrical body is disposed above the tapered cylinder, and the top of the cylindrical body is provided with a first feed inlet, which is configured to communicate with the outlet of the calcining kiln.

[0015] The tapered cylinder is tapered from top to bottom, and the bottom of the tapered cylinder is provided with the first discharge port.

[0016] According to the kiln head waste heat calcination system of this utility model, the heat absorption chamber includes a first cylinder and a second cylinder that are connected to each other;

[0017] The first cylinder is located above the second cylinder. The top of the first cylinder is formed with an air outlet and a second inlet. The air outlet is connected to the heating chamber, and the second inlet is connected to the first discharge outlet.

[0018] The second cylinder is tapered from top to bottom, and the second discharge port is located at the bottom of the second cylinder; the side wall of the second cylinder also has an air inlet that communicates with the air supply and heat exchange device.

[0019] According to the kiln head waste heat calcination system of this utility model, the heating chamber includes:

[0020] A first chamber is disposed above the high-temperature molten finished product material chamber, and the first chamber is connected to the high-temperature molten finished product material chamber;

[0021] The second chamber is connected to the first chamber, and at least a portion of the high-temperature molten finished product material chamber is disposed within the second chamber.

[0022] According to the waste heat calcination system at the kiln head of this utility model, the second chamber includes a third cylinder and a fourth cylinder that are connected to each other.

[0023] The third cylinder is located above the fourth cylinder, and the top of the third cylinder has a third feed inlet that communicates with the first hopper.

[0024] The fourth cylinder is tapered from top to bottom, and a third discharge port is formed at the bottom of the fourth cylinder, which is used to connect with the storage bin.

[0025] The waste heat calcination system at the kiln head according to this utility model also includes a feeding device;

[0026] The feeding device includes:

[0027] A feeding hopper is used to hold the material.

[0028] The screw conveyor has its outlet connected to the feed hopper's inlet and its outlet connected to the heating chamber.

[0029] The waste heat calcination system at the kiln head according to this utility model also includes a dust removal device;

[0030] The top of the heating chamber is provided with an exhaust vent, which is connected to the dust removal device; the dust discharge port of the dust removal device is connected to the feeding hopper.

[0031] The waste heat calcination system at the kiln head according to this utility model also includes:

[0032] A stirring mechanism is installed inside the heating chamber and is used to stir the materials inside the heating chamber.

[0033] This utility model's kiln head waste heat calcination system connects a high-temperature molten finished product material bin to the outlet of the calcining kiln. The high-temperature molten finished product material bin is used to hold the high-temperature molten finished product material heated by the calcining kiln. A heating bin for holding materials to be heated is connected to the high-temperature molten finished product material bin. An air supply and heat exchange device is set up to supply air to the high-temperature molten finished product material bin. The air blown out by the air supply and heat exchange device can be heated by the high-temperature molten finished product material in the high-temperature molten finished product material bin to form hot air, which flows into the heating bin to heat the material in the heating bin. This effectively utilizes the diffused heat, radiant heat and waste heat of the produced materials during the production operation of the calcining kiln, greatly improving the waste heat utilization efficiency of the system and effectively solving the defect of low thermal efficiency of rotary kilns in the prior art. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the kiln head waste heat calcination system provided in this embodiment of the utility model installed in the calcining kiln.

[0036] Figure 2 This is a cross-sectional schematic diagram of a portion of the kiln head waste heat calcination system provided in an embodiment of this utility model.

[0037] Figure 3This is a schematic diagram of a kiln head waste heat calcination system installed in a calcining kiln, according to another embodiment of this utility model.

[0038] Figure 4 This is a cross-sectional schematic diagram of a portion of the kiln head waste heat calcination system provided in another embodiment of this utility model.

[0039] Figure 5 This is a schematic diagram of a kiln head waste heat calcination system provided in another embodiment of this utility model.

[0040] Figure label:

[0041] 1. Kiln head waste heat calcination system; 2. Calcination kiln; 3. Main kiln fuel pipeline;

[0042] 11. High-temperature molten finished product material bin; 111. Buffer bin; 1111. Cylindrical cylinder; 1112. Gradient cylinder; 112. Heat absorption bin; 1121. First cylinder; 1122. Second cylinder;

[0043] 12. Air supply and heat exchange device; 13. Heating chamber; 131. First chamber; 1311. Emergency discharge pipe; 132. Second chamber; 1321. Third cylinder; 1322. Fourth cylinder;

[0044] 14. Feeding device; 141. Feeding hopper; 142. Screw conveyor; 15. Dust removal device. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0046] The following is combined with Figures 1-5 This invention describes the waste heat calcination system at the kiln head.

[0047] like Figure 1 and Figure 2As shown, this utility model provides a kiln head waste heat calcination system 1, including: a high-temperature molten finished product material bin 11, an air supply and heat exchange device 12, and a heating bin 13. The high-temperature molten finished product material bin 11 is configured to communicate with the outlet of the calcining kiln 2 to receive high-temperature molten finished product material from the calcining kiln 2. The air supply and heat exchange device 12 is communicated with the high-temperature molten finished product material bin 11 and is used to supply air to the high-temperature molten finished product material bin 11. The heating bin 13 is used to contain the material to be heated and is communicated with the high-temperature molten finished product material bin 11 to receive hot air from the high-temperature molten finished product material bin 11; the high-temperature molten finished product material bin 11, the air supply and heat exchange device 12, the outlet of the calcining kiln 2, and the heating bin 13 are all located in an integrally enclosed box-type bin with heat preservation function.

[0048] In this embodiment, the waste heat calcination system 1 can be installed at the outlet of the calcining kiln 2 to utilize the waste heat from the high-temperature molten finished products after heating in the calcining kiln 2. Specifically, the high-temperature molten finished product material bin 11 is connected to the outlet of the calcining kiln 2 so that the high-temperature molten finished product material after heating can be introduced from the calcining kiln 2 into the high-temperature molten finished product material bin 11. The air supply and heat exchange device 12 is used to supply air to the high-temperature molten finished product material bin 11. The air flows into the high-temperature molten finished product material bin 11 and exchanges heat with the high-temperature molten finished product material inside the high-temperature molten finished product material bin 11, forming hot air with a certain temperature. At the same time, by setting up a heating chamber 13 connected to the high-temperature molten finished product material bin 11, the heating chamber 13 is specifically used to hold the material to be heated (such as phosphogypsum), so that the hot air in the high-temperature molten finished product material bin 11 can enter the heating chamber 13 to heat and calcine the material.

[0049] Meanwhile, the high-temperature molten finished product material bin 11, the air supply and heat exchange device 12, the outlet of the calcining kiln 2, and the heating chamber 13 are all installed in an integrally enclosed box-type silo with heat preservation function. During the production process, the high-temperature molten finished product material in the calcining kiln 2 is first discharged into the enclosed box-type silo. The high-temperature molten finished product material and the kiln head of the calcining kiln 2 itself can provide heat (such as radiant heat, diffuse heat, etc.) to the enclosed box-type silo. This heat can be fully used to heat the materials in the high-temperature molten finished product material bin 11, the air supply and heat exchange device 12, and the heating chamber 13, further improving the thermal efficiency of the entire system.

[0050] The waste heat calcination system 1 of this utility model connects the high-temperature molten finished product material bin 11 and the outlet of the calcining kiln 2. The high-temperature molten finished product material bin 11 is used to hold the high-temperature molten finished product material heated by the calcining kiln 2. The heating bin 13, which is used to hold the material to be heated, is connected to the high-temperature molten finished product material bin 11. An air supply and heat exchange device 12 is set up to supply air to the high-temperature molten finished product material bin 11. The air blown out by the air supply and heat exchange device 12 can form hot air under the heating of the high-temperature molten finished product material in the high-temperature molten finished product material bin 11 and flow into the heating bin 13 to heat the material in the heating bin 13. This effectively utilizes the diffused heat, radiant heat and waste heat of the produced material during the production operation of the calcining kiln 2, greatly improves the waste heat utilization efficiency of the system, and effectively solves the defect of low thermal efficiency of rotary kilns in the prior art.

[0051] The kiln head waste heat calcination system 1 of this utility model can utilize the diffused heat generated during the calcination kiln 2, the radiant heat of the kiln head, and the high-temperature waste heat of the high-temperature molten finished material (such as ceramsite) after melting and forming to heat the material in the heating chamber 13, so as to heat, dry, or calcine the material in the heating chamber 13. At the same time, by introducing the high-temperature molten finished material into the high-temperature molten finished material chamber 11 and setting up an air supply and heat exchange device 12 to supply air to the high-temperature molten finished material chamber 11, the air blown out by the air supply and heat exchange device 12 can form hot air under the heating of the high-temperature molten finished material in the high-temperature molten finished material chamber 11, and is introduced into the heating chamber 13 to heat the material in the heating chamber. The contact area between the hot air and the material is larger, the heat exchange rate is faster, the heating is more uniform, and the high-temperature molten finished material in the high-temperature molten finished material chamber 11 can also be rapidly cooled.

[0052] Specifically, the heating chamber 13 can be set above the high-temperature molten finished product material chamber 11. The heating chamber 13 and the high-temperature molten finished product material chamber 11 can be connected by a ventilation duct so that the hot air heated in the high-temperature molten finished product material chamber 11 can rise and enter the heating chamber 13.

[0053] Specifically, in some embodiments, such as Figure 1 and Figure 2 As shown, the high-temperature molten finished product material bin 11 includes a buffer bin 111 and a heat-absorbing bin 112. The buffer bin 111 is configured to communicate with the outlet of the calcining kiln 2 and is provided with a first discharge port. The first discharge port is provided with a first valve, which is used to adjust the opening degree of the first discharge port. The heat-absorbing bin 112 is located below the buffer bin 111 and communicates with the first discharge port. The heat-absorbing bin 112 is provided with a second discharge port, which is used to discharge the high-temperature molten finished product material. The heat-absorbing bin 112 is connected to the heating bin 13 and the air supply and heat exchange device 12. The second discharge port is provided with a second valve, which is used to adjust the opening degree of the second discharge port.

[0054] In this embodiment, the high-temperature molten finished product material bin 11 includes a buffer bin 111 and a heat absorption bin 112 that are interconnected. The high-temperature molten finished product material that has been heated in the calcining kiln 2 first enters the buffer bin 111 for buffering, which does not affect the continuous discharge of the calcining kiln 2. The high-temperature molten finished product material entering the buffer bin 111 can enter the heat absorption bin 112 in batches through the first discharge port according to the heating needs, and exchange heat with the gas in the heat absorption bin 112. After forming hot air, it is introduced into the heating bin 13 through the heat absorption bin 112 to heat and calcine the material in the heating bin 13. Specifically, the first discharge port of the buffer chamber 111 is equipped with a first valve to control the discharge speed of the buffer chamber 111 to the heat absorption chamber 112. The second discharge port of the heat absorption chamber 112 is used to discharge the cooled high-temperature molten finished material after heat exchange. The second discharge port is equipped with a second valve to control the discharge speed of the heat absorption chamber 112. The first valve and the second valve work together to control the amount of high-temperature molten finished material in the heat absorption chamber 112 and the residence time of the high-temperature molten finished material in the heat absorption chamber 112 for heat exchange. For example, when heating and calcining a batch of material (phosphogypsum), the first valve can be opened first and the second valve closed to discharge a certain amount of high-temperature molten finished material into the heat absorption chamber 112. Then the first valve is closed to allow the high-temperature molten finished material to fully exchange heat with the gas in the heat absorption chamber 112. Finally, the second valve is opened to discharge the high-temperature molten finished material, so as to make full use of the residual heat in the high-temperature molten finished material.

[0055] Furthermore, in some embodiments, there are multiple heat absorption chambers 112. The buffer chamber 111 has multiple first discharge ports, and the heat absorption chambers 112 and the first discharge ports are connected in a one-to-one correspondence.

[0056] In this embodiment, by setting up multiple heat-absorbing chambers 112, the buffer chamber 111 is connected to the corresponding heat-absorbing chamber 112 through multiple independent first discharge ports. Each first discharge port is equipped with an independent first valve, and each second discharge port of the heat-absorbing chamber 112 is also equipped with an independent second valve, so as to independently control the second discharge port and the corresponding first discharge port of each heat-absorbing chamber 112. This allows the material in the buffer chamber 111 to be discharged into each heat-absorbing chamber 112 in a certain order, thereby achieving continuous discharge while ensuring the heat exchange time between the high-temperature molten finished material and the gas in the heat-absorbing chamber 112. This fully utilizes the residual heat in the high-temperature molten finished material and helps to improve the thermal efficiency of the entire system.

[0057] For example, such as Figure 2 and Figure 4As shown, there are two heat-absorbing chambers 112. When heating the material, the first valve of the left heat-absorbing chamber 112 can be opened and the second valve closed, while the first valve of the right heat-absorbing chamber 112 is closed. This allows only the high-temperature molten material to enter the left heat-absorbing chamber 112. Once the amount of high-temperature molten material in the left heat-absorbing chamber 112 is sufficient, the first valve of the left heat-absorbing chamber 112 is closed, and the first valve of the right heat-absorbing chamber 112 is opened and the second valve closed, allowing the high-temperature molten material to flow into the right heat-absorbing chamber 112. Simultaneously, the high-temperature molten material in the left heat-absorbing chamber 112 can fully exchange heat with the gas inside. After a period of heat exchange, the second valve is opened to discharge the high-temperature molten material that has completed heat exchange. This process, by alternately connecting the buffer chamber 111 and the two heat-absorbing chambers 112, ensures continuous discharge from the buffer chamber 111 while maintaining the residence time and heat exchange of the high-temperature molten material in the heat-absorbing chambers 112.

[0058] Specifically, in some embodiments, such as Figure 2 As shown, the buffer chamber 111 includes a cylindrical body 1111 and a tapered body 1112 connected to each other. The cylindrical body 1111 is positioned above the tapered body 1112, and a first feed inlet is provided at the top of the cylindrical body 1111, which is configured to communicate with the outlet of the calcining kiln 2. The tapered body 1112 tapers from top to bottom, and a first discharge port is provided at the bottom of the tapered body 1112.

[0059] In this embodiment, a cylindrical body 1111 and a tapered body 1112 are constructed within the buffer chamber 111, with the cylindrical body 1111 positioned at the top. The cylindrical body 1111 provides a large buffer space to buffer a sufficient amount of high-temperature molten finished material. Simultaneously, a tapered body 1112 is provided at the bottom of the cylindrical body 1111, and a first discharge port for discharging the high-temperature molten finished material is provided at the bottom of the tapered body 1112. A first valve is installed in the first discharge port to better control the discharge speed of the high-temperature molten finished material into the heat absorption chamber 112.

[0060] Specifically, the tapered cylinder 1112 can be a cone-shaped cylinder with the tip pointing downwards.

[0061] Specifically, in some embodiments, the heat absorption chamber 112 includes a first cylindrical body 1121 and a second cylindrical body 1122 that are connected to each other. The first cylindrical body 1121 is located above the second cylindrical body 1122. An air outlet and a second feed inlet are formed on the top of the first cylindrical body 1121. The air outlet is connected to the heating chamber 13, and the second feed inlet is connected to the first discharge outlet. The second cylindrical body 1122 is tapered from top to bottom, and the second discharge outlet is located at the bottom of the second cylindrical body 1122. An air inlet connected to the air supply and heat exchange device 12 is also formed on the side wall of the second cylindrical body 1122.

[0062] In this embodiment, a first cylinder 1121 and a second cylinder 1122 are constructed within the heat absorption chamber 112. The first cylinder 1121 is located at the top and is connected to the buffer chamber 111 through a second feed inlet at the top to receive the high-temperature molten finished product material discharged from the buffer chamber 111. The first cylinder 1121 can form a large heat exchange space to allow the high-temperature molten finished product material and the gas to fully contact and exchange heat. After heat exchange, the hot air is discharged into the heating chamber 13 through the air outlet at the top. The bottom of the first cylinder 1121 is provided with a tapered second cylinder 1122, and the bottom of the second cylinder 1122 is provided with a second discharge port. A second valve is provided in the second discharge port to better control the discharge speed of the high-temperature molten finished product material after heat exchange. In addition, the second cylinder 1122 is also connected to the air supply and heat exchange device 12 so that the air supply and heat exchange device 12 supplies air to the second cylinder 1122 and the air flows from bottom to top through the second cylinder 1122 and the first cylinder 1121 in sequence, and exchanges heat with the high-temperature molten finished material to form hot air which is then introduced into the heating chamber 13.

[0063] Alternatively, in some embodiments, such as Figure 1 and Figure 2 As shown, the heating chamber 13 is a separate chamber from the high-temperature molten finished product material chamber 11. After the material in the heating chamber 13 is heated and calcined, it is directly transported to the storage chamber through the conveying pipe of the heating chamber 13.

[0064] Alternatively, in other embodiments, such as Figure 3 and Figure 4 As shown, the heating chamber 13 includes a first chamber body 131 and a second chamber body 132. The first chamber body 131 is disposed above the high-temperature molten finished product material chamber 11, and the first chamber body 131 and the high-temperature molten finished product material chamber 11 are connected. The second chamber body 132 is connected to the first chamber body 131, and at least a portion of the high-temperature molten finished product material chamber 11 is disposed within the second chamber body 132.

[0065] In this embodiment, the heating chamber 13 is configured as a first chamber 131 and a second chamber 132 connected together. The first chamber 131 is positioned above the high-temperature molten finished product material chamber 11. Hot air from the high-temperature molten finished product material chamber 11 can enter the first chamber 131 to directly heat the material inside. After being heated by the hot air, the material inside the first chamber 131 is then introduced into the second chamber 132. At least a portion of the structure of the high-temperature molten finished product material chamber 11 is disposed within the second chamber 132, allowing the material inside the second chamber 132 to directly contact the outer wall of the high-temperature molten finished product material chamber 11. This facilitates heat exchange between the outer wall of the high-temperature molten finished product material chamber 11 and the high-temperature molten finished product material inside, further utilizing the waste heat of the high-temperature molten finished product material.

[0066] In some embodiments, such as Figure 3 and Figure 4 As shown, the first chamber 131 and the second chamber 132 are connected by a conveying pipe. The conveying pipe includes a first pipe section, an arc-shaped pipe section, and a second pipe section connected in sequence. The first pipe section is connected to the bottom of the first chamber 131 and extends upward from the bottom of the first chamber 131 to connect to one end of the arc-shaped pipe section. The second pipe section extends downward from the other end of the arc-shaped pipe section to connect to the top of the second chamber 132. In this embodiment, by setting the conveying pipe in a curved shape, the material can stay in the conveying pipe after entering it, so as to avoid the material falling directly downward into the second chamber 132. This allows the material to stay in the first chamber 131 and the conveying pipe for a sufficient period of time, fully exchange heat with the hot air, and improve the thermal efficiency of the entire system.

[0067] Specifically, in some embodiments, such as Figure 3 and Figure 4 As shown, the second chamber 132 includes a fourth cylinder 1322 connected to the third cylinder 1321. The third cylinder 1321 is located above the fourth cylinder 1322, and a third feed port communicating with the first chamber 131 is formed at the top of the third cylinder 1321. The fourth cylinder 1322 tapers from top to bottom, and a third discharge port is formed at the bottom of the fourth cylinder 1322, which is used to communicate with the storage chamber.

[0068] In this embodiment, a fourth cylinder 1322 is constructed within the second chamber 132, forming a third cylinder 1321. The third cylinder 1321 is located above and is connected to the first chamber 131 via a third feed inlet at its top to receive material discharged from the first chamber 131. The third cylinder 1321 forms a large heat exchange space, allowing for sufficient contact and heat exchange between the high-temperature molten finished material and the outer wall of the high-temperature molten finished material chamber 11. A tapered fourth cylinder 1322 is located at the bottom of the third cylinder 1321, and a third discharge port is provided at the bottom of the fourth cylinder 1322. This third discharge port is used to discharge the heated material into a storage chamber for storage.

[0069] Specifically, in some implementations, such as Figures 1 to 4 As shown, the kiln head waste heat calcination system 1 also includes a feeding device 14. The feeding device 14 includes a feeding hopper 141 and a screw conveyor 142. The feeding hopper 141 is used to hold materials, and the outlet of the feeding hopper 141 is connected to the inlet of the screw conveyor 142. The outlet of the screw conveyor 142 is connected to the heating chamber 13.

[0070] In this embodiment, the feeding hopper 141 is used to store the material to be heated. The material to be heated can enter the trough of the screw conveyor 142 from the outlet of the feeding hopper 141. A screw is provided in the trough of the screw conveyor 142. The screw rotates under the drive of the drive device and drives the material in the trough to move along the trough and enter the heating chamber 13 from the outlet on the trough. The structure is simple, convenient and practical.

[0071] Specifically, in some embodiments, such as Figures 1 to 4 As shown, the kiln head waste heat calcination system 1 also includes a dust removal device 15; the top of the heating chamber 13 is provided with an exhaust port, which is connected to the dust removal device 15; the dust discharge port of the dust removal device 15 is connected to the feeding hopper 141.

[0072] In this embodiment, the dust removal device 15 is connected to the exhaust port of the first chamber 131, allowing the gas after heat exchange to be discharged into the dust removal device 15 through the exhaust port. The dust removal device 15 removes dust from the gas before discharge, preventing impurities from polluting the external environment. Furthermore, by connecting the dust outlet of the dust removal device to the feeding hopper 141, the impurities discharged from the dust outlet (typically small particles) are mixed with the material to be heated in the feeding hopper 141 before being discharged into the heating chamber 13 for calcination.

[0073] Optionally, in some embodiments, the kiln head waste heat calcination system 1 further includes a stirring mechanism (not shown). The stirring mechanism is disposed within the heating chamber 13 and is used to stir the material within the heating chamber 13.

[0074] In this embodiment, by providing a stirring mechanism inside the heating chamber 13, the stirring mechanism can stir the material inside the heating chamber 13, so that the material can come into full and uniform contact with the gas inside the heating chamber 13, thereby so that the material is heated fully and uniformly.

[0075] Specifically, in some embodiments, a cover is installed at the kiln head of the calcining kiln 2, and an inner cavity is formed inside the cover that communicates with the high-temperature molten finished product material bin 11 and the outlet of the calcining kiln 2 respectively. When the heating bin 13 consists of only one bin body, the heating bin 13 is installed in the inner cavity of the cover (e.g., Figure 2 (As shown); or, in the case where the heating chamber 13 includes a first chamber body 131 and a second chamber body 132, the first chamber body 131 is installed inside the casing. During the production process, the high-temperature molten finished product material in the calcining kiln 2 is first discharged into the casing. Both the high-temperature molten finished product material and the kiln head of the calcining kiln 2 can provide heat to the casing, making the radiant temperature inside the casing reach over 1000 degrees Celsius, and radiating heat the heating chamber 13 inside the casing, further making full use of the waste heat generated by the calcining kiln 2 and improving the thermal efficiency of the entire system.

[0076] Furthermore, in yet another embodiment, such as Figure 5 As shown, a fuel pipeline channel is formed inside the casing of the calcining kiln 2 for the main kiln fuel pipeline 3 to pass through. The main kiln fuel pipeline 3 is connected to the calcining kiln 2 and is used to supply fuel (such as biomass fuel) and heat to the calcining kiln 2. When the fuel pipeline passes through the high-temperature section, the temperature of the fuel and hot air is greatly increased under the action of high-temperature heat conduction, thereby significantly improving the combustion efficiency of the fuel. During normal operation of the calcining kiln 2, the main kiln fuel pipeline 3 has a high temperature at the position corresponding to the kiln head and the casing, and can transfer heat into the casing through thermal radiation, thermal convection, etc., which can be used to heat the heating chamber 13, further improving the thermal efficiency of the entire system.

[0077] Optionally, an emergency discharge pipe 1311 is connected to the bottom of the first hopper 131. A valve is installed in the emergency discharge pipe 1311. In case of emergency discharge (e.g., when equipment malfunctions and discharge maintenance is required), the valve in the emergency discharge pipe 1311 can be opened to discharge the material in the first hopper 1311 from the emergency discharge pipe 1311.

[0078] Optionally, in some embodiments, one or more first heat-conducting pipes may be provided on the inner and / or outer sides of the high-temperature molten finished product material bin 11. The first heat-conducting pipes are in contact with the outer wall of the high-temperature molten finished product material bin 11, and the inlet of the first heat-conducting pipes is connected to an external air supply device (such as a blower). Exemplarily, the first heat-conducting pipes may be coiled around the outer side of the high-temperature molten finished product material bin 11. One or more second heat-conducting pipes may be provided on the inner and / or outer sides of the heating bin 13. The second heat-conducting pipes are in contact with the outer wall of the heating bin 13. Exemplarily, the second heat-conducting pipes may be coiled around the outer side of the heating bin 13, and the second heat-conducting pipes are connected to the first heat-conducting pipes in a one-to-one correspondence.

[0079] In this embodiment, the external air supply device can supply air to the first heat pipe. The gas in the first heat pipe exchanges heat with the high-temperature molten finished material in the pipe wall and the high-temperature molten finished material in the chamber 11 to form hot air with a certain temperature. After entering the second heat pipe, the hot air can heat the material in the heating chamber 13 through the pipe wall and the chamber wall of the heating chamber 13, further ensuring the heat exchange efficiency. At the same time, it can also ensure that the material in the heating chamber 13 is heated evenly, avoiding overheating or underheating. In addition, the first heat pipe can also improve the cooling rate of the high-temperature molten finished material in the high-temperature molten finished material in the chamber 11, so that the cooling temperature of the finished material exiting the chamber meets the requirements.

[0080] Optionally, in some embodiments, the feed inlet of the high-temperature molten finished product material bin 11 is provided with a feed plate, and the feed plate is provided with multiple strip-shaped feed channels parallel to each other to the feed inlet, so as to screen the high-temperature molten finished product material entering the high-temperature molten finished product material bin 11 from the cover, and prevent high-temperature molten finished product material with excessively large particle size from entering the high-temperature molten finished product material bin 11 and blocking the discharge port.

[0081] Meanwhile, the cover is equipped with an openable discharge window at the position corresponding to the material conveying plate. During normal production, the discharge window is kept closed so as not to affect production. Relevant personnel can open the discharge window periodically to remove the high-temperature molten finished material that has not passed through the material conveying channel and has accumulated on the material conveying plate.

[0082] Accordingly, the conveying plate can be set at an angle, with the height of the side of the conveying plate closer to the discharge window being lower than the height of the side farther from the discharge window. This allows the high-temperature molten finished product material with larger particle size accumulated above the conveying plate to move along the conveying plate towards the side closer to the discharge window, so that relevant personnel can remove the high-temperature molten finished product material accumulated on the conveying plate that has not passed through the conveying channel through the discharge window.

[0083] In addition, when a first heat-conducting pipe is installed inside the high-temperature molten finished product material bin 11, the material passage and the first heat-conducting pipe are staggered in the vertical direction (the material passage is not located directly above the first heat-conducting pipe) to prevent the high-temperature molten finished product material passing through the material passage from falling onto the first heat-conducting pipe and causing damage to the first heat-conducting pipe.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A waste heat calcination system at the kiln head, characterized in that, include: A high-temperature molten finished product material bin is configured to be connected to the outlet of the calcining kiln to receive high-temperature molten finished product material from the calcining kiln; An air supply device and a heat exchange device are connected to the high-temperature molten finished product material bin and are used to supply air to the high-temperature molten finished product material bin. A heating chamber is used to hold the material to be heated and is connected to the high-temperature molten finished product material chamber to receive hot air from the high-temperature molten finished product material chamber; The high-temperature molten finished product material silo, the air supply and heat exchange device, the outlet of the calcining kiln, and the heating chamber are all located in an integrally enclosed box-type silo with heat preservation function.

2. The waste heat calcination system at the kiln head according to claim 1, characterized in that, The high-temperature molten finished product material bin includes: The buffer compartment is configured to communicate with the outlet of the calcining kiln and is provided with a first discharge port; the first discharge port is provided with a first valve, which is used to adjust the opening degree of the first discharge port; A heat absorption chamber is located below the buffer chamber and is connected to the first discharge port; the heat absorption chamber is provided with a second discharge port, which is used to discharge the high-temperature molten finished material; the heat absorption chamber is connected to the heating chamber and the air supply and heat exchange device respectively; the second discharge port is provided with a second valve, which is used to adjust the opening of the second discharge port.

3. The waste heat calcination system at the kiln head according to claim 2, characterized in that, There are multiple heat absorption chambers; the buffer chamber has multiple first discharge ports, and the heat absorption chambers and the first discharge ports are connected in a one-to-one correspondence.

4. The waste heat calcination system at the kiln head according to claim 2, characterized in that, The cache compartment includes a connected cylindrical body and a tapered body; The cylindrical body is disposed above the tapered cylinder, and the top of the cylindrical body is provided with a first feed inlet, which is configured to communicate with the outlet of the calcining kiln. The tapered cylinder is tapered from top to bottom, and the bottom of the tapered cylinder is provided with the first discharge port.

5. The waste heat calcination system at the kiln head according to claim 2, characterized in that, The heat absorption chamber includes a first cylinder and a second cylinder that are connected to each other; The first cylinder is located above the second cylinder. The top of the first cylinder is formed with an air outlet and a second inlet. The air outlet is connected to the heating chamber, and the second inlet is connected to the first discharge outlet. The second cylinder is tapered from top to bottom, and the second discharge port is located at the bottom of the second cylinder; the side wall of the second cylinder also has an air inlet that communicates with the air supply and heat exchange device.

6. The waste heat calcination system at the kiln head according to claim 1, characterized in that, The heating chamber includes: A first chamber is disposed above the high-temperature molten finished product material chamber, and the first chamber is connected to the high-temperature molten finished product material chamber; The second chamber is connected to the first chamber, and at least a portion of the high-temperature molten finished product material chamber is disposed within the second chamber.

7. The waste heat calcination system at the kiln head according to claim 6, characterized in that, The second compartment includes a third cylinder and a fourth cylinder that are connected to each other; The third cylinder is located above the fourth cylinder, and the top of the third cylinder has a third feed inlet that communicates with the first hopper. The fourth cylinder is tapered from top to bottom, and a third discharge port is formed at the bottom of the fourth cylinder, which is used to connect with the storage bin.

8. The waste heat calcination system at the kiln head according to claim 1, characterized in that, It also includes a feeding device; The feeding device includes: A feeding hopper is used to hold the material. The screw conveyor has its outlet connected to the feed hopper's inlet and its outlet connected to the heating chamber.

9. The waste heat calcination system at the kiln head according to claim 8, characterized in that, It also includes dust removal equipment; The top of the heating chamber is provided with an exhaust vent, which is connected to the dust removal device; the dust discharge port of the dust removal device is connected to the feeding hopper.

10. The kiln head waste heat calcination system according to claim 1, characterized in that, Also includes: A stirring mechanism is installed inside the heating chamber and is used to stir the materials inside the heating chamber.

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