Extracorporeal waste heat utilization system for high-temperature calcination

Abstract

The utility model relates to the technical field of environmental protection equipment, in particular to an external waste heat utilization system for high-temperature calcination. The system comprises an inner kiln, an outer kiln and an air extractor, the inner kiln is used for calcining ceramsite, the outer kiln is sleeved on the periphery of the inner kiln and provided with a heating chamber, an air inlet and an air outlet are respectively arranged at two ends of the outer kiln, and the air extractor is connected with the air outlet and used for extracting hot air in the outer kiln. By means of the multi-layer kiln cylinder structure designed in a segmented mode and the air vents in the partition plates, the heat transfer efficiency is effectively improved, and meanwhile the heat energy utilization rate of the system is optimized through heat preservation and insulation materials and heat conduction materials. In addition, the safety and the stability of the system are ensured by additionally arranging a one-way air inlet valve and a pressure release valve, and the heat loss is further reduced by coating heat insulation sleeves on the exhaust pipe and the exhaust pipe. The effect of efficiently recycling waste heat generated in the ceramsite calcining process is achieved, and the energy utilization rate and the environmental protection performance are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of environmental protection equipment, in particular to a high-temperature calcination kiln body external waste heat utilization system. BACKGROUND

[0002] In the process of producing ceramic particles, a rotary kiln is usually used for high-temperature calcination. This process not only effectively improves the quality and performance of ceramic particles, but also significantly improves the production efficiency. During the calcination of ceramic particles, the outer surface temperature of the rotary kiln is generally very high, and a large amount of waste heat is generated.

[0003] In order to utilize the waste heat of the system, an outer kiln is provided outside the calcination kiln (inner kiln), and phosphogypsum is input between the inner kiln and the outer kiln to utilize the waste heat of the system to calcine the phosphogypsum.

[0004] However, only part of the waste heat can be utilized during the calcination of phosphogypsum, and part of the waste heat cannot be utilized, resulting in heat loss. It is not conducive to energy saving and environmental protection and overall efficiency. Therefore, how to improve the existing waste heat utilization method and improve the overall thermal efficiency of the system is still a technical problem to be solved CONTENT OF THE INVENTION

[0005] The present application provides a high-temperature calcination kiln body external waste heat utilization system. The following technical scheme is adopted:

[0006] A high-temperature calcination kiln body external waste heat utilization system, comprising:

[0007] An inner kiln for calcining ceramic particles, the inner kiln has an open end as a feeding port and the other end is closed;

[0008] An outer kiln is provided on the side of the inner kiln, and a heating chamber is provided between the outer kiln and the inner kiln; one end of the outer kiln is provided with an air inlet, and the air inlet and the feeding port are provided on the same side; the other end of the outer kiln is provided with an air outlet;

[0009] An air extraction device connected to the air outlet and used for extracting hot air inside the outer kiln.

[0010] By adopting the above technical scheme, when the calcination kiln is working, the air in the heating chamber is heated, and the hot air in the heating chamber can be extracted by the air extraction device and utilized in other forms, such as calcining phosphogypsum or heating, etc. The utilization form is various, and since the hot air carries more heat, it helps to improve the waste heat utilization rate.

[0011] Preferably, the inner kiln is sequentially provided with a head section, a middle section and a tail section from the open end to the closed end;

[0012] The outer kiln comprises a first kiln cylinder, a second kiln cylinder and a third kiln cylinder; the first sleeve is sleeved on the periphery of the head section, and the air inlet is arranged on the first kiln cylinder; the second kiln cylinder is sleeved on the periphery of the middle section; the third kiln cylinder is sleeved on the periphery of the tail section, and the air outlet is arranged on the third kiln cylinder.

[0013] The first kiln cylinder and the second kiln cylinder and the second kiln cylinder and the third kiln cylinder are both provided with a partition plate; the partition plate is provided with an air vent.

[0014] By adopting the above technical scheme, since the temperatures of the head section, the middle section and the tail section of the inner kiln are different, generally 120-180 degrees Celsius for the head section, 160-280 degrees Celsius for the middle section and 240-460 degrees Celsius for the tail section, the hot air can flow step by step along the length direction of the inner kiln and gradually heat up through the first kiln cylinder, the second kiln cylinder and the third kiln cylinder, so that the heat energy of the head section, the middle section and the tail section can be fully utilized, and the waste heat utilization rate is improved, and the partition plate is arranged to ensure that each stage can heat the air sufficiently.

[0015] Preferably, the material of the first kiln cylinder, the second kiln cylinder and the third kiln cylinder is a heat insulation material.

[0016] By adopting the above technical scheme, the heat loss of the hot air inside the outer kiln can be effectively reduced, the waste heat utilization rate is improved, and the energy efficiency of the whole system is improved. At the same time, the application of the heat insulation material can also reduce the influence of the external environment on the system, and ensure the stability and safety of the system operation.

[0017] Preferably, the material of the partition plate is a heat conducting material.

[0018] By adopting the above technical scheme, the material of the partition plate is a heat conducting material, so that the heat can be effectively transferred between the sections, ensuring that the heat distribution of the whole system is more uniform, improving the waste heat utilization rate and reducing the heat loss.

[0019] Preferably, a one-way air inlet valve is arranged at the air inlet.

[0020] By adopting the above technical scheme, the one-way air inlet valve can effectively prevent the external cold air from flowing into the inner kiln, ensuring that the hot air in the outer kiln is not diluted, thereby improving the waste heat utilization efficiency. At the same time, the one-way air inlet valve can also ensure the stable operation of the system and avoid the safety hidden danger caused by the reverse flow of gas.

[0021] Preferably, a pressure relief valve is arranged on the outer kiln, and the pressure relief valve is arranged on the third kiln cylinder.

[0022] By adopting the technical scheme, the pressure relief valve arranged on the outer kiln can be automatically opened when the system pressure is too high, and the excessive pressure is released, so that safety accidents caused by excessive pressure are avoided, and stable operation and safe operation of the system are ensured. Since the temperature inside the third kiln cylinder is the highest, the pressure relief valve is arranged on the third kiln cylinder, so that system failure caused by rapid increase of air pressure can be effectively avoided.

[0023] Preferably, the air extraction device comprises an air extraction pump, an air extraction pipe connected with the air extraction pump, and an exhaust pipe, and the air extraction pipe is connected with the third outer kiln.

[0024] By adopting the technical scheme, the air extraction device can effectively extract hot air inside the outer kiln and deliver the hot air to the flue gas waste heat calcination system for phosphogypsum calcination treatment and to the heating system for heating or application in other scenarios, so that the waste heat in the ceramsite calcination process is fully utilized, the energy utilization rate is improved, the utilization form is diversified, and heat loss is reduced.

[0025] Preferably, the air extraction pipe and the exhaust pipe are both coated with a heat preservation sleeve.

[0026] By adopting the technical scheme, heat loss of the hot air in the transmission process is effectively reduced, and the waste heat utilization rate of the system is improved.

[0027] In summary, the present application has at least one of the following beneficial technical effects:

[0028] 1. The heating chamber is arranged between the inner kiln and the outer kiln, and the air extraction device is used to extract hot air inside the outer kiln, so that the waste heat utilization rate is effectively improved, heat loss is reduced, and effective utilization of energy is realized.

[0029] 2. The first kiln cylinder, the second kiln cylinder and the third kiln cylinder are arranged, so that the heat in different temperature ranges of the calcination kiln head section, middle section and tail section can be fully utilized, and the waste heat utilization rate of the calcination kiln is improved.

[0030] 3. The first kiln cylinder, the second kiln cylinder and the third kiln cylinder are made of heat preservation and insulation materials, and the partition plate is made of heat conduction materials, so that the heat energy management capability of the system is further improved, and efficient conduction and utilization of heat energy in each region are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a structural schematic view of a waste heat utilization system of a high-temperature calcination kiln in an embodiment of the present application.

[0032] Marked in the drawing: 1, inner kiln; 2, outer kiln; 21, first kiln cylinder; 22, second kiln cylinder; 23, third kiln cylinder; 3, heating chamber; 4, air extraction device; 41, air extraction pump; 42, air extraction pipe; 43, exhaust pipe; 5, partition plate; 51, air vent; 6, one-way air inlet valve; 7, pressure relief valve. DETAILED DESCRIPTION

[0033] The application is further described below in conjunction with the accompanying drawings. Figure 1 The application is further described below in conjunction with the accompanying drawings.

[0034] The embodiment of the application provides a high-temperature calcination kiln external waste heat utilization system, which comprises an inner kiln 1, an outer kiln 2 and an air extraction device 4. The inner kiln 1 is used for calcining ceramsite, one end of the inner kiln 1 is open as a feeding port, and the other end is closed. The outer kiln 2 is arranged on the circumferential side of the inner kiln 1, and a heating chamber 3 is arranged between the outer kiln 2 and the inner kiln 1. One end of the outer kiln 2 is provided with an air inlet, and the air inlet and the feeding port are arranged on the same side. The other end of the outer kiln 2 is provided with an air outlet. The air extraction device 4 is connected with the air outlet and used for extracting hot air in the outer kiln 2. When the inner kiln 1 works, the air in the heating chamber 3 is heated, and the high-temperature air in the heating chamber 3 can be extracted by the air extraction device 4 and utilized in other forms, such as calcining phosphogypsum or heating. Since the hot air carries more heat, the utilization rate of waste heat is improved, and energy waste is reduced.

[0035] Specifically, the inner kiln 1 can be made of high-temperature-resistant material to ensure its stability and durability in a high-temperature environment. The inner kiln 1 is divided into a head section, a middle section and a tail section from the feeding end to the closed end. The outer kiln 2 is composed of a first kiln cylinder 21, a second kiln cylinder 22 and a third kiln cylinder 23, which correspond to the head section, the middle section and the tail section of the inner kiln 1 respectively. The first kiln cylinder 21 is arranged on the circumferential side of the head section, and the air inlet is arranged on the first kiln cylinder 21. The second kiln cylinder 22 is arranged on the circumferential side of the middle section. The third kiln cylinder 23 is arranged on the circumferential side of the tail section, and the air outlet is arranged on the third kiln cylinder 23. Since the temperatures of the head section, the middle section and the tail section of the inner kiln 1 are different, generally, the temperature of the head section is 120-180 degrees Celsius, the temperature of the middle section is 160-280 degrees Celsius, and the temperature of the tail section is 240-460 degrees Celsius. Therefore, the hot air can flow along the length direction of the inner kiln 1 gradually through the first kiln cylinder 21, the second kiln cylinder 22 and the third kiln cylinder 23, so that the heat energy of the head section, the middle section and the tail section can be fully utilized, and the utilization rate of waste heat is improved.

[0036] The connecting positions between the first kiln cylinder 21 and the second kiln cylinder 22 and between the second kiln cylinder 22 and the third kiln cylinder 23 are both provided with a partition plate 5, so that the kiln cylinders are relatively isolated, and the air in each kiln cylinder can be fully heated. The partition plate 5 is provided with an air passage 51, so that the hot air can flow.

[0037] The material of the first kiln cylinder 21, the second kiln cylinder 22 and the third kiln cylinder 23 can be selected as heat insulation materials such as aluminum silicate fiber or expanded perlite, so as to reduce the heat loss to the outside. The material of the partition plate 5 is selected as a heat-conducting material such as copper alloy or aluminum alloy, which helps to accelerate the heat conduction speed and improve the heating efficiency. Such a combination not only ensures good heat preservation effect, but also realizes efficient heat transfer.

[0038] A one-way air inlet valve 6 is arranged at the air inlet to prevent the inflow of external cold air into the system, which affects the utilization effect of waste heat. In addition, a pressure relief valve 7 is arranged on the outer kiln 2 to ensure the safety of the system operation. When the internal pressure of the system exceeds the set value, the pressure relief valve 7 will automatically open to release the excess pressure, avoiding damage to the equipment due to high pressure.

[0039] The air extraction device 4 includes an air extraction pump 41, an air extraction pipe 42 connected with the air extraction pump 41 and an exhaust pipe 43, and the air extraction pipe 42 is connected with the air outlet on the third kiln cylinder 23. In order to maximize the temperature of the hot air, the air extraction pipe 42 and the exhaust pipe 43 are both covered with a heat preservation sleeve such as glass wool or polyurethane foam. In this way, heat loss can be minimized during transmission, and the effective utilization rate of heat energy can be improved.

[0040] The implementation principle of the embodiment is that a multi-layer heating system is formed by arranging a plurality of outer kilns 2 outside the inner kiln 1, so that the high-temperature waste heat generated by the inner kiln 1 can be transferred to the materials in the outer kiln 2 layer by layer, thereby realizing more complete energy recovery. At the same time, through reasonable design and material selection, the efficiency and safety of the system are ensured, the energy consumption is greatly reduced, and the overall economic efficiency and environmental protection benefits are improved.

[0041] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, therefore: any equivalent changes made on the basis of the structure, shape, principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A high temperature calcination kiln system for utilizing the waste heat outside the kiln, characterized in that, The application relates to a calcining kiln. The application relates to a calcining kiln. The application relates to a calcining kiln. The application relates to a calcining kiln.

2. A system for utilizing the residual heat of a high-temperature calcination kiln according to claim 1, characterized in that, The application relates to a calcining kiln. The application relates to a calcining kiln. The application relates to a calcining kiln.

3. A system for utilizing the residual heat of a high-temperature calcination kiln according to claim 2, characterized in that, The application relates to a calcining kiln.

4. The system for utilizing the residual heat of a high-temperature calcining kiln according to claim 2, wherein The application relates to a calcining kiln.

5. The system for utilizing the residual heat of a high-temperature calcining kiln according to claim 1 or 2, wherein The application relates to a calcining kiln.

6. A system for utilizing the residual heat of a high-temperature calcination kiln according to claim 2, characterized in that, The application relates to a calcining kiln.

7. The system for utilizing residual heat of a high-temperature calcining kiln according to claim 1 or 2, wherein The application relates to a calcining kiln.

8. A system for utilizing the residual heat of a high-temperature calcining kiln according to claim 7, characterized in that, The application relates to a calcining kiln. The application relates to a calcining kiln. The application relates to a calcining kiln. The application relates to a calcining kiln. The application relates to a calcining kiln. The application relates to a calcining kiln. The application relates to a calcining kiln. The application relates to a calcining kiln. The application relates to a calcining kiln. The application relates to a calcining kiln. The application relates to a calcining kiln. The application relates to a calcining kiln. The application relates to a calcining kiln. The application relates to a calcining kiln. The application relates to a calcining kiln. The application relates to a calcining kiln. The application relates to a calcining kiln. The application relates to a calcining kiln. The application relates to a calcining kiln. 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