Belt type roasting machine for carbon-containing pellets and combustion control process of belt type roasting machine
By using high-temperature and medium-temperature combustion components in the belt calciner to supplement hot air into different process sections, the problem of low resource utilization efficiency was solved, the rational utilization of thermal energy and cost reduction were achieved, rapid cooling cracking of pellets was avoided, and production efficiency was improved.
Patent Information
- Application Number
- CN202511769613.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-27
- Publication Date
- 2026-01-02
AI Technical Summary
Existing belt roasters suffer from low resource utilization efficiency during the reheating process, with fuel wasted in the high-temperature section and hot air being directly emitted in the low-temperature section, resulting in high production costs.
High-temperature and medium-temperature combustion components are used to supply high-temperature and medium-temperature hot air to different process sections. The hot air from the secondary combustion section and air-cooling section is recovered. High-calorific-value and low-calorific-value fuels are burned by high-temperature burners and medium-temperature burners and then supplied to the roasting section, preheating section and homogenization section respectively, so as to achieve rational utilization of thermal energy.
It reduces fuel costs, improves resource utilization efficiency, and reduces production costs. At the same time, it enables step-by-step cooling of pellets, preventing cracking problems during the rapid cooling process.
Smart Images
Figure CN121250084A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of iron and steel metallurgy technology, specifically relating to a belt roaster for carbon-containing pellets and its combustion control process. Background Technology
[0002] Carbon-containing pellets are an important raw material for blast furnace or direct reduction ironmaking in the metallurgical field. Their core characteristic is the addition of a certain proportion of carbonaceous materials (such as coal or coke powder) to iron ore powder, followed by pelletizing and consolidation processes to produce pellets with a certain strength and reactivity. Belt roasters are one of the core pieces of equipment in modern pellet production, mainly used for the entire process of drying, preheating, roasting, and cooling of iron ore powder after pelletizing, to obtain high-strength, high-metallurgical-performance oxide pellets.
[0003] The roasting machine in the relevant technology usually includes a drying section, a preheating section, a roasting section, a homogenizing section and an air cooling section arranged in sequence. During the roasting process of carbon-containing pellets, external combustion devices are needed to supplement heat to the preheating section, roasting section and homogenizing section to ensure the furnace temperature.
[0004] Current heat replenishment methods involve adding heat generated by the burner to the preheating, roasting, and soaking sections. However, due to the different furnace temperatures in these sections, only high-calorific-value fuels can be used to meet the high-temperature requirements of the roasting section. This results in waste by adding excessively high-temperature heat to the preheating and soaking sections. Furthermore, the direct discharge of hot air from processes such as the air-cooling and drying sections leads to poor resource utilization efficiency and requires improvement. Summary of the Invention
[0005] In order to solve all or some of the above problems, the purpose of this invention is to provide a belt roaster for carbon-containing pellets and its combustion control process, which can achieve rational and efficient use of resources, thereby reducing production costs.
[0006] In a first aspect, the present invention provides a belt calciner for carbon-containing pellets, comprising, in sequence, a forced-air drying section, an exhaust drying section, a preheating section, a calcination section, a homogenizing section, a secondary combustion section, a first air-cooling section, and a second air-cooling section, and further comprising: The high-temperature heating component has one end connected to the secondary combustion section and the first air-cooling section respectively, and the other end connected to the calcination section and the homogenization section respectively, so that the hot air from the secondary combustion section and the first air-cooling section can enter the calcination section and the homogenization section. The medium-temperature heating component is connected at one end to the first air-cooling section and at the other end to the preheating section, so that the hot air from the first air-cooling section can enter the preheating section. A high-temperature combustion assembly is used to burn high-calorific-value fuels and to supply the high-temperature hot air generated by the combustion to the roasting section; The medium-temperature combustion assembly is used to burn low-calorific-value fuels and to supplement the preheating section and homogenization section with the medium-temperature hot air generated by combustion.
[0007] Optionally, the high-temperature combustion assembly includes: There are multiple high-temperature burners, and the heat exhaust ends of the multiple high-temperature burners are respectively connected to the calcination section; The high-calorific-value fuel intake pipe assembly is connected at one end to an external fuel pipeline and at the other end to the fuel ends of the multiple high-temperature burners respectively; The high-temperature combustion-supporting tube assembly has one end connected to the combustion-supporting ends of multiple high-temperature burners, and the other end connected to the second air-cooling section, so that the flue gas of the second air-cooling section can be used to support the combustion of the high-temperature burners.
[0008] Optionally, the belt roaster further includes: The second cooling furnace hood is connected to the top of the second air-cooling section; A forced-air drying box is connected to the bottom of the forced-air drying section; The first recovery pipe is connected at one end to the second cooling furnace hood and at the other end to the blower drying box; The first recovery fan is connected to the first recovery pipe and is used to send the hot air from the second air-cooling section into the blower drying section; The high-temperature combustion-supporting pipe assembly is connected to the first recovery pipe.
[0009] Optionally, the belt roaster further includes: A secondary combustion air box is connected to the bottom of the secondary combustion section; The second recovery pipe is connected at one end to the secondary combustion air box and at the other end to the first recovery pipe; The second recovery fan is connected to the second recovery pipe and is used to send part of the hot air in the first recovery pipe into the secondary combustion section.
[0010] Optionally, the intermediate-temperature combustion assembly includes: There are multiple medium-temperature burners, some of which have their heat exhaust ends connected to the preheating section, and others have their heat exhaust ends connected to the heat equalization section. The medium-calorific-value fuel intake pipe assembly is connected at one end to an external fuel pipeline and at the other end to the fuel ends of the multiple medium-temperature burners respectively; The medium-temperature combustion-supporting tube assembly has one end connected to the combustion-supporting end of each of the medium-temperature burners, and the other end connected to the blower drying section, so that the flue gas from the blower drying section can be used to support the combustion of the medium-temperature burners.
[0011] Optionally, the belt roaster further includes: A forced-air drying oven hood is connected to the top of the forced-air drying section; The discharge pipe is connected at one end to the blower drying furnace hood and at the other end to the external flue gas treatment equipment. An exhaust fan is connected to the exhaust pipe and is used to exhaust the flue gas from the blower drying section. The medium-temperature combustion-supporting pipe assembly is connected to the discharge pipe.
[0012] Optionally, the belt roaster further includes: The heat-injecting air assembly has one end connected to the calcination section and the heat-injecting section respectively, and the other end connected to the exhaust drying section and the preheating section respectively, so that the hot air from the calcination section and the heat-injecting section can enter the exhaust drying section and the preheating section. The exhaust assembly is connected at one end to the exhaust drying section, the preheating section and the calcination section respectively, and at the other end to an external flue gas treatment device, so that the flue gas from the exhaust drying section, the preheating section and the calcination section can enter the external flue gas treatment device.
[0013] Optionally, the high-temperature heating component includes: The high-temperature heat replenishment main pipe is connected at one end to the top of the secondary combustion section and the first air-cooling section, and the other end is sealed. There are two sets of high-temperature heat supply branch pipes. The top of one set of high-temperature heat supply branch pipes is connected to the high-temperature heat supply main pipe and the bottom is connected to the calcination section. The top of the other set of high-temperature heat supply branch pipes is connected to the high-temperature heat supply main pipe and the bottom is connected to the heat soaking section.
[0014] Optionally, the medium-temperature heating component includes: There are two medium-temperature heat supply main pipes, which are symmetrically distributed on both sides of the high-temperature heat supply main pipe. One end of each of the two medium-temperature heat supply main pipes is connected to the top of the first air-cooling section, and the other end is sealed. There are two sets of medium-temperature heat supply branch pipes. The top of each set of medium-temperature heat supply branch pipes is connected to the corresponding medium-temperature heat supply main pipe, and the bottom of each set is connected to the preheating section.
[0015] Secondly, the present invention provides a combustion control process for a belt roaster for carbon-containing pellets, comprising the following steps: S1, carbon-containing pellets are fed into the head of the belt calciner, and the carbon-containing pellets pass through the blower drying section, the exhaust drying section, the preheating section, the calcination section, the homogenization section, the secondary combustion section, the first air cooling section and the second air cooling section in sequence, and are finally discharged from the tail of the belt calciner. S2, hot air from the secondary combustion section and the first air cooling section is sent into the calcination section and the homogenization section, and hot air is supplied to the calcination section and the homogenization section through the high-temperature supplementary heating component. S3, hot air from the first air-cooling section is sent into the preheating section, and hot air is supplied to the preheating section through the medium-temperature heat supplementation component; S4, the hot air from the second air-cooling section is sent into the blower drying section and the secondary combustion section; S5, hot air from the roasting section and the homogenization section is sent into the exhaust drying section and the preheating section.
[0016] As can be seen from the above technical solution, the belt roaster for carbon-containing pellets and its combustion control process provided by the present invention have the following advantages: This carbon-containing pelletizing belt roaster and its combustion control process supply high-temperature hot air generated by high-temperature combustion components burning high-calorific-value fuels to the roasting section, and medium-temperature hot air generated by medium-temperature combustion components burning low-calorific-value fuels to the preheating and homogenizing sections. Different temperature sections utilize different calorific-value fuels, reducing fuel costs and thus production costs. Simultaneously, hot air or flue gas from some sections can be utilized by other sections, achieving rational and efficient resource utilization and further reducing production costs.
[0017] Other features and advantages of the present invention will be set forth in the following description. Attached Figure Description
[0018] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.
[0019] Figure 1 This is a schematic diagram of the overall structure of the belt roaster in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the belt roasting machine in Embodiment 1 of the present invention, mainly used to show the protective partition wall; Figure 3 This is a schematic diagram of the belt roaster in Embodiment 1 of the present invention, mainly used to demonstrate the high-temperature combustion components; Figure 4 This is a schematic diagram of the belt roaster in Embodiment 1 of the present invention, mainly used to illustrate the low-temperature combustion component; Figure 5 This is a schematic diagram of the belt roaster in Embodiment 1 of the present invention, mainly used to show the heat dissipation and air replenishment components; Figure 6 This is a schematic diagram of the belt roaster in Embodiment 1 of the present invention, mainly used to show the exhaust assembly, the high-temperature heating assembly and the low-temperature heating assembly; Figure 7 This is a flowchart of the combustion control process in Embodiment 2 of the present invention.
[0020] Explanation of reference numerals in the attached figures: 1. Blow-air drying section; 2. Exhaust-air drying section; 3. Preheating section; 4. Calcination section; 5. Homogenization section; 6. Secondary combustion section; 7. First air-cooling section; 8. Second air-cooling section; 9. Protective partition wall; 10. High-temperature supplementary heating assembly; 101. High-temperature supplementary heating main pipe; 102. High-temperature supplementary heating branch pipe; 11. Medium-temperature supplementary heating assembly; 111. Medium-temperature supplementary heating main pipe; 112. Medium-temperature supplementary heating branch pipe; 12. High-temperature combustion assembly; 121. High-temperature burner; 122. High-calorific-value fuel inlet pipe assembly; 123. High-temperature combustion aid pipe assembly; 13. Medium-temperature combustion assembly; 131. Medium-temperature burner; 132. Medium-calorific-value fuel inlet pipe assembly; 133. Medium-temperature combustion aid pipe assembly; 14. First 15. Cooling air box; 16. Second cooling air box; 17. Cooling pipe; 18. Cooling fan; 19. Second cooling furnace hood; 20. Blowing drying air box; 21. First recovery pipe; 22. First recovery fan; 23. Secondary combustion air box; 24. Second recovery pipe; 25. Blowing drying furnace hood; 26. Discharge pipe; 27. Discharge fan; 28. Heat soaking air assembly; 281. Heat soaking air box; 282. Exhaust drying furnace hood; 283. Heat soaking air pipe; 284. Heat soaking fan; 29. Exhaust assembly; 291. Exhaust drying air box; 292. Preheating air box; 293. Calcination air box; 294. Exhaust pipe; 295. Exhaust fan. Detailed Implementation
[0021] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be arbitrarily combined with each other.
[0022] Example 1 like Figures 1-6 The above is an embodiment 1 of the present invention, which discloses a belt calciner for carbon-containing pellets, including a blower drying section 1, an exhaust drying section 2, a preheating section 3, a calcination section 4, a homogenization section 5, a secondary combustion section 6, a first air-cooling section 7, and a second air-cooling section 8 arranged in sequence.
[0023] In one embodiment, such as Figure 1 , Figure 2 As shown, protective partitions 9 are respectively installed between the blower drying section 1 and the exhaust drying section 2, between the exhaust drying section 2 and the preheating section 3, between the calcination section 4 and the homogenization section 5, between the homogenization section 5 and the secondary combustion section 6, and between the first air cooling section 7 and the second air cooling section 8 to prevent air leakage between the corresponding process sections.
[0024] Because a secondary combustion section 6 is added between the soaking zone 5 and the first air-cooling zone 7, some residual carbon remains when the pellets reach the soaking zone 5. The secondary combustion section 6 allows this residual carbon to continue burning. At the same time, this design also enables the pellets to be cooled in stages, improving the problem of cracks caused by excessive internal stress in the pellets due to sudden rapid cooling of high-temperature pellets.
[0025] In one embodiment, such as Figure 1 As shown, the belt roaster also includes a high-temperature supplementary heating component 10. One end of the high-temperature supplementary heating component 10 is connected to the secondary combustion section 6 and the first air cooling section 7 respectively, and the other end is connected to the roasting section 4 and the homogenization section 5 respectively, so that the hot air from the secondary combustion section 6 and the first air cooling section 7 can enter the roasting section 4 and the homogenization section 5, thereby realizing the recovery and utilization of heat energy.
[0026] In one embodiment, such as Figure 1 As shown, the belt roaster also includes a medium-temperature heating component 11. One end of the medium-temperature heating component 11 is connected to the first air-cooling section 7, and the other end is connected to the preheating section 3, so that the hot air from the first air-cooling section 7 can enter the preheating section 3, thereby realizing the recovery and utilization of heat energy.
[0027] In one embodiment, such as Figure 1 As shown, the belt roaster also includes a high-temperature combustion assembly 12 and a medium-temperature combustion assembly 13. The high-temperature combustion assembly 12 is used to burn high-calorific-value fuels and feeds the high-temperature hot air generated by the combustion into the roasting section 4. The medium-temperature combustion assembly 13 is used to burn low-calorific-value fuels and feeds the medium-temperature hot air generated by the combustion into the preheating section 3 and the homogenizing section 5.
[0028] In this embodiment, the belt roaster for carbon-containing pellets feeds the high-temperature hot air generated by the high-temperature combustion component 12 burning high-calorific-value fuel into the roasting section 4, and feeds the medium-temperature hot air generated by the medium-temperature combustion component 13 burning low-calorific-value fuel into the preheating section 3 and the homogenizing section 5. Different calorific-value fuels are used for different process sections at different temperatures, which can reduce fuel costs and thus reduce production costs.
[0029] Furthermore, the hot air from the secondary combustion section 6 and the first air-cooling section 7 can enter the roasting section 4 and the homogenizing section 5 through the high-temperature supplementary heating component 10, and the hot air from the first air-cooling section 7 can enter the preheating section 3 through the medium-temperature supplementary heating component 11, thereby realizing the recovery and utilization of heat energy and further reducing production costs.
[0030] In one embodiment, such as Figure 1 , Figure 3 As shown, the high-temperature combustion assembly 12 includes a high-temperature burner 121, a high-calorific-value fuel inlet pipe assembly 122, and a high-temperature combustion-supporting pipe assembly 123. There are multiple high-temperature burners 121, each of which has a fuel end, a combustion-supporting end, and a heat exhaust end. The heat exhaust ends of the multiple high-temperature burners 121 are respectively connected to the calcination section 4.
[0031] In one embodiment, such as Figure 1 , Figure 3 As shown, one end of the high-calorific-value fuel inlet pipe assembly 122 is connected to an external fuel pipeline, and the other end is connected to the fuel end of a plurality of high-temperature burners 121 respectively. One end of the high-temperature combustion-supporting pipe assembly 123 is connected to the combustion-supporting end of a plurality of high-temperature burners 121 respectively, and the other end is connected to the second air-cooling section 8, so that the flue gas of the second air-cooling section 8 can be used to support the combustion of the high-temperature burners 121, thereby achieving rational utilization of resources.
[0032] In one embodiment, such as Figure 1 , Figure 4 As shown, the medium-temperature combustion assembly 13 includes a medium-temperature burner 131, a medium-calorific-value fuel intake pipe assembly 132, and a medium-temperature combustion-supporting pipe assembly 133. There are multiple medium-temperature burners 131, each of which has a fuel end, a combustion-supporting end, and a heat exhaust end. The heat exhaust ends of some of the medium-temperature burners 131 are connected to the preheating section 3, and the heat exhaust ends of other medium-temperature burners 131 are connected to the heat homogenization section 5.
[0033] In one embodiment, such as Figure 1 , Figure 4 As shown, one end of the medium-calorific-value fuel inlet pipe assembly 132 is connected to an external fuel pipeline, and the other end is connected to the fuel end of multiple medium-temperature burners 131 respectively. One end of the medium-temperature combustion-supporting pipe assembly 133 is connected to the combustion-supporting end of multiple medium-temperature burners 131 respectively, and the other end is connected to the blower drying section 1, so that the flue gas of the blower drying section 1 can be used to support the combustion of the medium-temperature burners 131, thereby realizing the rational utilization of resources.
[0034] In one embodiment, such as Figure 1 , Figure 3 As shown, the belt roaster also includes a first cooling air box 14 and a second cooling air box 15. The first cooling air box 14 is connected to the bottom of the first air-cooling section 7, and the second cooling air box 15 is connected to the bottom of the second air-cooling section 8. Cooling pipes 16 are respectively connected to the bottom of the first cooling air box 14 and the second cooling air box 15, and a cooling fan 17 is connected to each cooling pipe 16. The cooling fan 17 is used to send air into the first air-cooling section 7 and the second air-cooling section 8.
[0035] In one embodiment, such as Figure 1 , Figure 3As shown, the belt roaster also includes a second cooling furnace hood 18, a forced-air drying box 19, a first recovery pipe 20, and a first recovery fan 21. The second cooling furnace hood 18 is connected to the top of the second air-cooling section 8, and the forced-air drying box 19 is connected to the bottom of the forced-air drying section 1. One end of the first recovery pipe 20 is connected to the second cooling furnace hood 18, and the other end is connected to the forced-air drying box 19. The first recovery fan 21 is connected to the first recovery pipe 20. The first recovery fan 21 is used to send the hot air from the second air-cooling section 8 into the forced-air drying section 1, thereby achieving full utilization of thermal energy.
[0036] In one embodiment, such as Figure 1 , Figure 3 As shown, the high-temperature combustion-supporting tube assembly 123 is connected to the first recovery tube 20, meaning that some of the flue gas in the first recovery tube 20 can enter the high-temperature burner 121 through the high-temperature combustion-supporting tube assembly for combustion support in the high-temperature burner 121, thereby achieving the rational and full utilization of resources.
[0037] In one embodiment, such as Figure 1 , Figure 3 As shown, the belt roaster also includes a secondary combustion air box 22, a second recovery pipe 23, and a second recovery fan 24. The secondary combustion air box 22 is connected to the bottom of the secondary combustion section 6. One end of the second recovery pipe 23 is connected to the secondary combustion air box 22, and the other end is connected to the first recovery pipe 20. The second recovery fan 24 is connected to the second recovery pipe 23, and the first recovery fan 24 is used to send part of the hot air in the first recovery pipe 20 into the secondary combustion section 6, thereby realizing the full utilization of thermal energy.
[0038] In one embodiment, such as Figure 1 , Figure 4 As shown, the belt roaster also includes a forced-air drying furnace hood 25, an exhaust pipe 26, and an exhaust fan 27. The forced-air drying furnace hood 25 is connected to the top of the forced-air drying section 1. One end of the exhaust pipe 26 is connected to the forced-air drying furnace hood 25, and the other end is connected to an external flue gas treatment device. The exhaust fan 27 is connected to the exhaust pipe 26 and is used to discharge the flue gas of the forced-air drying section 1 to the external flue gas treatment device.
[0039] In one embodiment, such as Figure 1 , Figure 4 As shown, the medium-temperature combustion-supporting pipe assembly 133 is connected to the exhaust pipe 26, meaning that some of the flue gas from the exhaust pipe 26 can enter the medium-temperature burner 131 through the medium-temperature combustion-supporting pipe assembly 133 for combustion support in the medium-temperature burner 131, thereby achieving the rational and full utilization of resources.
[0040] In this embodiment, the high-temperature combustion-supporting pipe assembly 123 and the medium-temperature combustion-supporting pipe assembly 133 respectively include a gas pipeline and a gas fan, so that the flue gas from the exhaust drying section 2 and the second air-cooling section 8 can smoothly enter the high-temperature burner 121 and the medium-temperature burner 131.
[0041] In one embodiment, such as Figure 1 , Figure 5 As shown, the belt roaster also includes a homogenizing air supply component 28. One end of the homogenizing air supply component 28 is connected to the roasting section 4 and the homogenizing section 5 respectively, and the other end is connected to the exhaust drying section 2 and the preheating section 3 respectively, so that the hot air from the roasting section 4 and the homogenizing section 5 can enter the drying section and the preheating section 3, thereby achieving rational utilization of resources.
[0042] In one embodiment, such as Figure 1 , Figure 5 As shown, the heat homogenization air supply assembly 28 includes a heat homogenization air box 281, an exhaust drying furnace hood 282, a heat homogenization air duct 283, and a heat homogenization fan 284. The heat homogenization air box 281 is connected to the bottom of the calcination section 4 and the heat homogenization section 5, and the exhaust drying furnace hood 282 is connected to the top of the exhaust drying section 2. One end of the heat homogenization air duct 283 is connected to the heat homogenization air box 281, and the other end is connected to the exhaust drying furnace hood 282 and the preheating section 3, respectively. The heat homogenization fan 284 is connected to the heat homogenization air duct 283 and is used to send hot air from the calcination section 4 and the heat homogenization section 5 into the exhaust drying section 2 and the preheating section 3.
[0043] In one embodiment, such as Figure 1 , Figure 6 As shown, the belt roaster also includes an exhaust assembly 29. One end of the exhaust assembly 29 is connected to the exhaust drying section 2, the preheating section 3 and the roasting section 4 respectively, and the other end is connected to an external flue gas treatment device so that the flue gas from the exhaust drying section 2, the preheating section 3 and the roasting section 4 can enter the external flue gas treatment device.
[0044] In one embodiment, such as Figure 1 , Figure 6 As shown, the exhaust assembly 29 includes an exhaust drying box 291, a preheating box 292, a calcining box 293, an exhaust pipe 294, and an exhaust fan 295. The exhaust drying box 291 is connected to the bottom of the exhaust drying section 2, the preheating box 292 is connected to the bottom of the preheating section 3, and the calcining box 293 is connected to the bottom of the calcining section 4. One end of the exhaust pipe 294 is connected to the exhaust drying box 291, the preheating box 292, and the calcining box 293 respectively, and the other end is connected to an external flue gas treatment device. The exhaust fan 295 is connected to the exhaust pipe 294 and is used to send the flue gas from the exhaust drying section 2, the preheating section 3, and the calcining section 4 into the external flue gas treatment device.
[0045] In one embodiment, such as Figure 1 , Figure 6As shown, the high-temperature heating assembly 10 includes a high-temperature heating main pipe 101 and two sets of high-temperature heating branch pipes 102. One end of the high-temperature heating main pipe 101 is connected to the top of the secondary combustion section 6 and the first air-cooling section 7, and the other end is sealed. The top of one set of high-temperature heating branch pipes 102 is connected to the high-temperature heating main pipe 101, and the bottom is connected to the calcination section 4. The top of the other set of high-temperature heating branch pipes 102 is connected to the high-temperature heating main pipe 101, and the bottom is connected to the heat homogenization section 5, so that the hot air from the secondary combustion section 6 and the first air-cooling section 7 can smoothly enter the calcination section 4 and the heat homogenization section 5.
[0046] In one embodiment, such as Figure 1 , Figure 6 As shown, the medium-temperature heat exchange component 11 includes two medium-temperature heat exchange main pipes 111 and two sets of medium-temperature heat exchange branch pipes 112. The two medium-temperature heat exchange main pipes 111 are symmetrically distributed on both sides of the high-temperature heat exchange main pipe 101. One end of each of the two medium-temperature heat exchange main pipes 111 is connected to the top of the first air-cooling section 7, and the other end is sealed. The tops of the two sets of medium-temperature heat exchange branch pipes 112 are connected to the corresponding medium-temperature heat exchange main pipes 111, and the bottoms are connected to the preheating section 3, so that the hot air from the first air-cooling section 7 can smoothly enter the preheating section 3.
[0047] As can be seen from the above process, this belt roaster can fully utilize the hot air energy within the system, achieving rational resource recovery and utilization, thereby reducing production costs. Simultaneously, using fuels with different calorific values for different temperature process sections further reduces costs. Furthermore, the high-temperature pellets can be cooled in stages, gradually decreasing in temperature, effectively preventing cracks during rapid cooling while ensuring complete combustion of residual carbon before the air-cooling section.
[0048] Example 2 like Figure 7 The image shows Embodiment 2 of the present invention, which discloses a combustion control process for a belt roaster used for carbon-containing pellets, including the following steps: S1, carbon-containing pellets are fed into the head of the belt roaster, and the carbon-containing pellets pass through the blower drying section 1, the exhaust drying section 2, the preheating section 3, the roasting section 4, the homogenization section 5, the secondary combustion section 6, the first air cooling section 7 and the second air cooling section 8 in sequence, and are finally discharged from the tail of the belt roaster. S2, hot air from the secondary combustion section 6 and the first air cooling section 7 is sent into the roasting section 4 and the homogenization section 5, and hot air is supplied to the roasting section 4 and the homogenization section 5 through the high temperature supplementary heating component 10. S3, hot air from the first air-cooling section 7 is sent into the preheating section 3, and hot air is supplied to the preheating section 3 through the medium-temperature heat supplementing component 11; S4, hot air from the second cooling section is sent into the blower drying section 1 and the secondary combustion section 6; S5, hot air from roasting section 4 and homogenization section 5 is sent into exhaust drying section 2 and preheating section 3.
[0049] In general, as the pellets pass through the blower drying section 1, the exhaust drying section 2, the preheating section 3, the roasting section 4, the homogenization section 5, the secondary combustion section 6, the first air cooling section 7, and the second air cooling section 8 in sequence, the hot air from the secondary combustion section 6 and part of the hot air from the first air cooling section 7 are mixed and then enter the roasting section 4 and the homogenization section 5 through the high-temperature supplementary heating component 10. The remaining hot air from the first air cooling section 7 enters the preheating section 3 through the low-temperature supplementary heating component.
[0050] The first recovery fan 21 sends hot air from the second air-cooling section 8 into the blower drying box 19 and dries the green pellet layer. Part of the dried flue gas is discharged to the external waste gas treatment equipment through the exhaust pipe 26, and the other part of the flue gas enters the low-temperature burner under the action of the low-temperature combustion-supporting pipe group and is used for combustion support in the low-temperature burner. The heat generated by the combustion of the low-temperature burner is added to the preheating section 3.
[0051] Meanwhile, the second recovery fan 24 sends part of the flue gas from the first recovery pipe 20 into the secondary combustion section 6, and the high-temperature combustion-supporting pipe group 123 sends part of the flue gas from the first recovery pipe 20 into the high-temperature burner 121 for combustion support. The heat generated by the combustion of the high-temperature burner 121 is added to the preheating section 3.
[0052] In addition, the heat-inducing air assembly 28 sends a portion of the hot air from the calcination section 4 and the heat-inducing section 5 into the exhaust drying section 2 to fully dry the green pellet layer, and sends another portion into the preheating section 3 to fully preheat the green pellet layer.
[0053] As described above, this combustion control process can fully utilize the hot air energy within the system, that is, it can rationally recover and apply the hot air and flue gas from a portion of the process section, thereby improving resource utilization efficiency. Simultaneously, the combustion control process enables waste gas recycling, reducing emissions, improving the thermal efficiency of the belt roaster, reducing process energy consumption, and achieving energy conservation and emission reduction. Furthermore, this combustion control process is simple and has a high thermal utilization rate, making it worthy of application and promotion.
[0054] It should be noted that, unless otherwise stated, the technical or scientific terms used in this invention should have the ordinary meaning as understood by one of ordinary skill in the art.
[0055] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined.
[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention 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 or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. A belt roaster for carbon-containing pellets, characterized in that, The system includes, in sequence, a forced-air drying section (1), an exhaust drying section (2), a preheating section (3), a calcination section (4), a homogenization section (5), a secondary combustion section (6), a first air-cooling section (7), and a second air-cooling section (8), and also includes: The high-temperature heating component (10) is connected at one end to the secondary combustion section (6) and the first air cooling section (7) respectively, and at the other end to the calcination section (4) and the homogenization section (5) respectively, so that the hot air from the secondary combustion section (6) and the first air cooling section (7) can enter the calcination section (4) and the homogenization section (5); The medium-temperature heating component (11) is connected at one end to the first air-cooling section (7) and at the other end to the preheating section (3) so that the hot air from the first air-cooling section (7) can enter the preheating section (3); A high-temperature combustion assembly (12) is used to burn high-calorific-value fuel and to supply the high-temperature hot air generated by combustion into the roasting section (4); The medium-temperature combustion assembly (13) is used to burn low-calorific-value fuel and to supplement the medium-temperature hot air generated by combustion into the preheating section (3) and the homogenizing section (5).
2. The belt roaster for carbon-containing pellets according to claim 1, characterized in that, The high-temperature combustion assembly (12) includes: There are multiple high-temperature burners (121), and the heat exhaust ends of the multiple high-temperature burners (121) are respectively connected to the roasting section (4); The high-calorific-value fuel inlet pipe assembly (122) is connected at one end to an external fuel pipeline and at the other end to the fuel ends of the plurality of high-temperature burners (121); The high-temperature combustion-supporting tube assembly (123) is connected at one end to the combustion-supporting ends of the plurality of high-temperature burners (121) respectively, and at the other end to the second air-cooling section (8) so that the flue gas of the second air-cooling section (8) can be used to support the combustion of the high-temperature burners (121).
3. The belt roaster for carbon-containing pellets according to claim 2, characterized in that, The belt roaster also includes: The second cooling furnace hood (18) is connected to the top of the second air-cooling section (8); A forced-air drying box (19) is connected to the bottom of the forced-air drying section (1); The first recovery pipe (20) is connected at one end to the second cooling furnace hood (18) and at the other end to the blower drying box (19); The first recovery fan (21) is connected to the first recovery pipe (20) and is used to send the hot air of the second air-cooling section (8) into the blower drying section (1); The high-temperature combustion-supporting pipe assembly (123) is connected to the first recovery pipe (20).
4. The belt roaster for carbon-containing pellets according to claim 3, characterized in that, The belt roaster also includes: A secondary combustion air box (22) is connected to the bottom of the secondary combustion section (6); The second recovery pipe (23) is connected at one end to the secondary combustion air box (22) and at the other end to the first recovery pipe (20); The second recovery fan (24) is connected to the second recovery pipe (23) and is used to send part of the hot air in the first recovery pipe (20) into the secondary combustion section (6).
5. The belt roaster for carbon-containing pellets according to claim 1, characterized in that, The intermediate-temperature combustion assembly (13) includes: There are multiple medium-temperature burners (131), some of which have their heat exhaust ends connected to the preheating section (3), and the other part of which have their heat exhaust ends connected to the heat equalization section (5). The medium-calorific-value fuel intake pipe assembly (132) is connected at one end to an external fuel pipeline and at the other end to the fuel ends of the plurality of medium-temperature burners (131); The medium-temperature combustion-supporting tube assembly (133) is connected at one end to the combustion-supporting ends of multiple medium-temperature burners (131) respectively, and at the other end to the blower drying section (1) so that the flue gas of the blower drying section (1) can be used to support the combustion of the medium-temperature burner (131).
6. The belt roaster for carbon-containing pellets according to claim 5, characterized in that, The belt roaster also includes: A forced-air drying oven hood (25) is connected to the top of the forced-air drying section (1); The discharge pipe (26) is connected at one end to the blower drying oven hood (25) and at the other end to the external flue gas treatment equipment; An exhaust fan (27) is connected to the exhaust pipe (26) and is used to exhaust the flue gas from the blower drying section (1); The medium-temperature combustion-supporting pipe assembly (133) is connected to the discharge pipe (26).
7. The belt roaster for carbon-containing pellets according to claim 1, characterized in that, The belt roaster also includes: The heat supply air assembly (28) is connected at one end to the calcination section (4) and the heat supply section (5) respectively, and at the other end to the exhaust drying section (2) and the preheating section (3) respectively, so that the hot air from the calcination section (4) and the heat supply section (5) can enter the exhaust drying section (2) and the preheating section (3); The exhaust assembly (29) is connected at one end to the exhaust drying section (2), the preheating section (3) and the calcination section (4) respectively, and at the other end to the external flue gas treatment equipment so that the flue gas from the exhaust drying section (2), the preheating section (3) and the calcination section (4) can enter the external flue gas treatment equipment.
8. The belt roaster for carbon-containing pellets according to claim 1, characterized in that, The high-temperature heat exchange component (10) includes: The high-temperature heat replenishment main pipe (101) is connected at one end to the top of the secondary combustion section (6) and the first air-cooling section (7), and the other end is sealed. Two sets of high-temperature heat supplementary branch pipes (102) are provided. The top of one set of high-temperature heat supplementary branch pipes (102) is connected to the high-temperature heat supplementary main pipe (101) and the bottom is connected to the calcination section (4). The top of the other set of high-temperature heat supplementary branch pipes (102) is connected to the high-temperature heat supplementary main pipe (101) and the bottom is connected to the heat equalization section (5).
9. The belt roaster for carbon-containing pellets according to claim 8, characterized in that, The medium-temperature heating component (11) includes: There are two medium-temperature heat supply main pipes (111), which are symmetrically distributed on both sides of the high-temperature heat supply main pipe (101). One end of each of the two medium-temperature heat supply main pipes (111) is connected to the top of the first air-cooling section (7), and the other end is sealed. There are two sets of medium-temperature heat supply branch pipes (112). The top of each set of medium-temperature heat supply branch pipes (112) is connected to the corresponding medium-temperature heat supply main pipe (111), and the bottom is connected to the preheating section (3).
10. A combustion control process for a belt roaster for carbon-containing pellets according to any one of claims 1-9, characterized in that, Includes the following steps: S1, carbon-containing pellets are fed into the head of the belt roaster. The carbon-containing pellets pass through the blower drying section (1), the exhaust drying section (2), the preheating section (3), the roasting section (4), the homogenization section (5), the secondary combustion section (6), the first air cooling section (7) and the second air cooling section (8) in sequence, and are finally discharged from the tail of the belt roaster. S2, hot air from the secondary combustion section (6) and the first air cooling section (7) is sent into the calcination section (4) and the homogenization section (5), and hot air is supplied to the calcination section (4) and the homogenization section (5) through the high temperature supplementary heating component (10); S3, hot air from the first air-cooling section (7) is sent into the preheating section (3), and hot air is supplied to the preheating section (3) through the medium-temperature heat supply component (11); S4, hot air from the second air-cooling section (8) is sent into the blower drying section (1) and the secondary combustion section (6); S5, hot air from the roasting section (4) and the homogenizing section (5) is sent into the exhaust drying section (2) and the preheating section (3).