A heat comprehensive utilization system based on lime kiln and combustion beam

Abstract

The application provides a heat comprehensive utilization system based on a lime kiln and a combustion beam, belongs to the technical field of calcining equipment, and comprises a beam body, a cooling oil circulation pipeline, a steam pipeline and a combustion air pipeline; the cooling oil circulation pipeline is in communication with an oil cooling cavity. A fan is arranged on the combustion air pipeline, the fan can make gas flow to form an air flow; the steam pipeline is in communication with a gas cooling cavity, a steam valve is arranged between the steam pipeline and the gas cooling cavity, the steam pipeline further has a tempering branch in communication with a hollow cavity, and a tempering valve is arranged on the tempering branch; the combustion air pipeline is in communication with the gas cooling cavity; a combustion valve is arranged between the combustion air pipeline and the gas cooling cavity, the combustion air pipeline further has a combustion branch in communication with the hollow cavity, and an air inlet valve is arranged on the combustion branch. The heat comprehensive utilization system based on the lime kiln and the combustion beam provided by the application realizes energy saving to the maximum by means of liquid and gas collaborative cooling.

Description

Technical Field

[0001] This application belongs to the field of calcination equipment technology, specifically relating to a comprehensive heat utilization system based on a lime kiln and a combustion beam. Background Technology

[0002] The multi-burner combustion beam is the core component of a lime kiln, and its performance directly affects the output, quality, and energy consumption of lime.

[0003] In existing technology, the beam is located inside the lime kiln. To prevent the beam from being burned by the high temperature, a cooling system is usually installed. Specifically, this cooling system involves multiple parallel cooling channels installed inside the beam (close to the inner wall of the beam). These cooling channels can be connected sequentially. By introducing heat transfer oil into each cooling channel, the heat transfer oil, as a cooling medium, can carry away the heat from the beam.

[0004] While using heat transfer oil can ensure the cooling of the beam, the heat transfer oil carries away a significant amount of heat, leading to heat loss within the kiln and thus failing to guarantee the kiln's energy-saving effect. Summary of the Invention

[0005] This application provides a comprehensive heat utilization system based on lime kilns and combustion beams, which aims to solve the problem that existing lime kiln production or lime kiln and combustion beam cooling methods rely entirely on heat transfer oil to remove a large amount of heat.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: A comprehensive heat utilization system based on a lime kiln and a combustion beam is provided, comprising: The beam has a hollow cavity inside; at the bottom of the hollow cavity, the beam has a gas outlet and a combustion air outlet coaxially arranged; the side wall of the beam has an oil cooling cavity and a gas cooling cavity that are isolated from each other; the beam has an air passage connecting the gas cooling cavity and the hollow cavity, and the air passage has an air valve. A cooling oil circulation pipeline is connected to the oil cooling chamber; A steam pipeline is connected to the air cooling chamber; a steam valve is provided between the steam pipeline and the air cooling chamber; the steam pipeline also has a conditioning branch connected to the hollow cavity, and a conditioning valve is provided on the conditioning branch; A combustion-supporting air duct is connected to the air cooling chamber; a combustion-supporting valve is provided between the combustion-supporting air duct and the air cooling chamber; the combustion-supporting air duct also has a combustion-supporting branch connected to the hollow cavity, and an air inlet valve is provided on the combustion-supporting branch. The air cooling chamber is either in steam cooling mode or in combustion air cooling mode. When the air cooling chamber is in steam cooling mode, the steam valve, conditioning valve, and air inlet valve are open, while the combustion air valve and air outlet valve are closed. When the air cooling chamber is in combustion air cooling mode, the combustion air valve, air outlet valve, and conditioning valve are open, while the steam valve and air inlet valve are closed.

[0007] In one possible implementation, the quenching and tempering branch includes a pre-quenching and tempering path and a post-quenching and tempering path, with the pre-quenching and tempering path located at the inlet of the steam pipeline and the gas cooling chamber, and the post-quenching and tempering path located at the outlet of the steam pipeline and the gas cooling chamber. In the case of steam cooling mode in the gas cooling chamber, the conditioned post-path is connected to the hollow cavity, while the conditioned pre-path is isolated from the hollow cavity; the steam introduced into the hollow cavity is superheated steam. When the air-cooled chamber is in combustion air cooling mode, the pre-cooling path is connected to the hollow cavity, and the post-cooling path is isolated from the hollow cavity; the steam introduced into the hollow cavity is saturated steam.

[0008] In one possible implementation, one end of the conditioning pre-path is connected to the hollow cavity, and the other end of the conditioning pre-path is the discharge end.

[0009] In one possible implementation, a first heat exchanger is connected to the steam pipeline, the first heat exchanger having a first channel and a second channel, the steam pipeline being connected to the first channel; the second channel of the first heat exchanger being connected to the kiln exhaust gas; In this process, softened water is introduced into the first channel of the first heat exchanger. After exchanging heat with the kiln exhaust gas, the softened water forms steam and enters the steam pipeline.

[0010] In one possible implementation, a second heat exchanger is connected in series with the first heat exchanger, and the second heat exchanger also has a first channel and a second channel. The second channel of the first heat exchanger is connected to the second channel of the second heat exchanger, and the first channel of the second heat exchanger is supplied with gas; the outlet of the first channel of the second heat exchanger is connected to the gas outlet of the hollow cavity through a gas pipeline.

[0011] In one possible implementation, a third heat exchanger is connected to the gas pipeline, and the interior of the third heat exchanger also has a first channel and a second channel; The first channel of the third heat exchanger is supplied with gas, and the second channel of the third heat exchanger is connected to the steam pipeline at the outlet of the gas cooling chamber through a gas supplementary heating pipeline. A gas supplementary heating valve is installed on the gas supplementary heating pipeline.

[0012] In one possible implementation, a fourth heat exchanger is provided on the cooling oil circulation pipeline, the fourth heat exchanger having a first channel and a second channel; The first channel of the fourth heat exchanger is connected to the cooling oil circulation pipeline, and the second channel of the fourth heat exchanger is connected to the combustion air pipeline.

[0013] In one possible implementation, when the air cooling chamber is in steam cooling mode, a fifth heat exchanger is connected to the outlet of the fourth heat exchanger, and the fifth heat exchanger has a first channel and a second channel. The first channel of the fifth heat exchanger is connected to the combustion air pipeline, and the second channel of the fifth heat exchanger is connected to the steam pipeline at the outlet of the gas cooling chamber through the combustion air heat supply pipeline. The steam introduced into the fifth heat exchanger here is superheated steam. A combustion air heat supply valve is connected to the combustion air heat supply pipeline.

[0014] In one possible implementation, the top of the beam is provided with an upwardly protruding pressure-reducing structure, wherein the bottom of the beam has two angles that are both formed along the longitudinal direction, each angle is provided with a protective plate on the outside, and a horizontally outwardly extending widening structure is provided on the outside of the protective plate. When the air-cooled chamber is in steam-cooled mode, the steam pipeline at the outlet of the cooling chamber can be connected to a steam power generation device.

[0015] In one possible implementation, the hollow cavity is connected to a conditioning pipe that communicates with a conditioning branch, and the conditioning pipe is provided with several conditioning outlets.

[0016] This application provides a comprehensive heat utilization system based on a lime kiln and a combustion beam. Compared with existing technologies, the internal sidewall of the beam is divided into an oil cooling chamber and a gas cooling chamber. The oil cooling chamber still uses cooling oil for cooling. The heat transfer oil has the characteristics of high specific heat capacity and good thermal stability, which can stably absorb heat from the high-temperature areas of the beam, ensuring the structural strength of key areas such as the bottom of the beam and preventing deformation or burn-out. Through the combined cooling method of liquid and combustion air, or the combined cooling method of liquid and steam, the heat carried away from the outside can be reduced while ensuring the cooling effect, maximizing the energy-saving effect and ensuring that more of the heat generated in the kiln is used for its own operation. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of a heat utilization system based on a lime kiln and a combustion beam provided in an embodiment of the present invention; Figure 2 A schematic diagram of the steam cooling mode of the heat utilization system based on lime kiln and combustion beam provided in an embodiment of the present invention; Figure 3 A schematic diagram of the combustion air cooling mode of the heat utilization system based on lime kiln and combustion beam provided in an embodiment of the present invention; Figure 4A schematic diagram of the cross-sectional structure of the beam in the heat utilization system based on a lime kiln and a combustion beam provided in an embodiment of the present invention; Figure 5 A cross-sectional schematic diagram of the burner structure in a heat utilization system based on a lime kiln and a combustion beam provided in an embodiment of the present invention; Figure 6 A schematic diagram of the beam structure of the heat utilization system based on a lime kiln and a combustion beam provided in an embodiment of the present invention. Figure 1 ; Figure 7 A schematic diagram of the beam structure of the heat utilization system based on a lime kiln and a combustion beam provided in an embodiment of the present invention. Figure 2 .

[0018] Explanation of reference numerals in the attached drawings: 1. Beam; 11. Hollow cavity; 12. Gas outlet; 13. Combustion air outlet; 14. Oil cooling chamber; 141. Reinforcing partition; 15. Gas cooling chamber; 16. Pressure reducing structure; 17. Protective plate; 171. Widened structure; 18. Gas passage pipe; 181. Gas passage valve; 2. Cooling oil circulation pipe; 21. Fourth heat exchanger; 22. Fifth heat exchanger; 221. First switching valve; 23. Combustion air bypass; 231. First bypass valve; 3. Steam pipe; 31. Steam valve; 32. First heat exchanger; 4. Combustion air duct. 41. Combustion-supporting valve; 42. Combustion-supporting branch; 43. Air inlet valve; 44. Combustion-supporting air reheating pipeline; 45. Combustion-supporting air reheating valve; 5. Conditioning branch; 51. Conditioning valve; 52. Conditioning pre-circuit; 53. Conditioning post-circuit; 54. External network valve; 6. Second heat exchanger; 7. Gas pipeline; 71. Third heat exchanger; 72. Gas reheating pipeline; 73. Gas reheating valve; 74. Central cylinder; 75. Inner spiral blade; 76. Outer spiral blade; 77. Gas bypass; 78. Second bypass valve; 79. Second switching valve; 8. Steam power generation unit. Detailed Implementation

[0019] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0020] Please refer to the following: Figures 1 to 7This application describes a comprehensive heat utilization system based on a lime kiln and a combustion beam. The system includes a beam body 1, a cooling oil circulation pipeline 2, a steam pipeline 3, and a combustion air pipeline 4. The beam body 1 has a hollow cavity 11. At the bottom of the hollow cavity 11, the beam body 1 has a coaxially arranged gas outlet 12 and combustion air outlet 13. The sidewalls of the beam body 1 have mutually isolated oil cooling chambers 14 and gas cooling chambers 15. Both the oil cooling chamber 14 and the gas cooling chamber 15 are equipped with several reinforcing baffles 141, which improve the strength of the beam body 1 and form cooling chamber channels. The reinforcing baffles 141 in the oil cooling chamber 14 do not completely seal the oil cooling chamber 14, and the reinforcing baffles 141 in the gas cooling chamber 15 do not completely seal the gas cooling chamber 15. The oil cooling chamber 14 and the gas cooling chamber 15 are completely separated.

[0021] The beam 1 has an air passage 18 connecting the air cooling chamber 15 and the hollow cavity 11, and an air passage valve 181 on the air passage 18. The air passage 18 and the combustion air passage 4 are arranged opposite each other at the connection point of the air cooling chamber 15, that is, the combustion air passage 4 and the air passage 18 are located at both ends of the beam 1. Both ends of the beam 1 are located outside the kiln body, and the air passage 18 and the combustion air passage 4 are located at both ends of the portion of the beam 1 outside the kiln body. An insulation layer is provided on the outer peripheral wall of the kiln body.

[0022] The cooling oil circulation pipe 2 is connected to the oil cooling chamber 14. The combustion air pipe 4 is equipped with a fan, which can make the gas flow to form an airflow.

[0023] Steam pipe 3 is connected to air cooling chamber 15. Steam valve 31 is provided between steam pipe 3 and air cooling chamber 15. Steam pipe 3 also has a conditioning branch 5 connected to hollow cavity 11. Conditioning branch 5 is provided with conditioning valve 51.

[0024] Combustion-supporting air duct 4 is connected to air cooling chamber 15; a combustion-supporting valve 41 is provided between combustion-supporting air duct 4 and air cooling chamber 15; combustion-supporting air duct 4 also has a combustion-supporting branch 42 connected to hollow cavity 11; and an air inlet valve 43 is provided on combustion-supporting branch 42.

[0025] The gas cooling chamber 15 is either in steam cooling mode or in combustion air cooling mode. When the gas cooling chamber 15 is in steam cooling mode, the steam valve 31, the conditioning valve 51, and the air inlet valve 43 are open, while the combustion air valve 41 and the air outlet valve 181 are closed. When the gas cooling chamber 15 is in combustion air cooling mode, the combustion air valve 41, the air outlet valve 181, and the conditioning valve 51 are open, while the steam valve 31 and the air inlet valve 43 are closed.

[0026] This application provides a comprehensive heat utilization system based on a lime kiln and a combustion beam. Compared with existing technologies, the internal sidewall of the beam 1 is divided into an oil cooling chamber 14 and a gas cooling chamber 15. The oil cooling chamber 14 still uses cooling oil for cooling. The heat transfer oil has the characteristics of high specific heat capacity and good thermal stability, which can stably absorb the heat in the high-temperature area of ​​the beam 1, ensuring the structural strength of key areas such as the bottom of the beam 1 and preventing deformation or burn-out. When switching to steam cooling mode, steam has the characteristics of high heat transfer coefficient and fast heat exchange rate, which can quickly remove the heat from the beam 1.

[0027] When switching to combustion air cooling mode, the combustion air passes through the air cooling chamber 15 and finally enters the hollow cavity 11 through the air pipe 18. The combustion air in the hollow cavity 11 is discharged from the combustion air outlet 13, and the gas is discharged from the gas outlet 12. The preheated combustion air entering the kiln can significantly improve the gas ignition temperature and combustion efficiency, which is beneficial to the stable combustion of low calorific value fuels.

[0028] Through the aforementioned configuration in this application, the combined cooling method of liquid and combustion air, or the combined cooling method of liquid and steam, can reduce the heat carried away from the outside while ensuring the cooling effect, thereby maximizing energy saving and ensuring that more of the heat generated inside the kiln is used for its own operation. Furthermore, the heat transfer oil is located at the bottom, and due to its high heat carrying capacity, it can achieve efficient cooling of the bottom end of beam 1, thereby improving the structural stability of beam 1 under high-temperature kiln conditions.

[0029] It should be noted that only one of the steam cooling mode and the combustion air cooling mode can be selected at a time. That is, if the steam cooling mode is selected, the combustion air cooling mode cannot be used; conversely, if the combustion air cooling mode is selected, the steam cooling mode cannot be used. The choice between the steam cooling mode and the combustion air cooling mode is determined based on the actual operating conditions.

[0030] Regardless of whether steam cooling mode or combustion air cooling mode is selected, the conditioning branch 5 needs to introduce steam into the hollow cavity 11, with the steam accounting for 2% to 6% of the combustion air. This part of steam can enter the kiln as a conditioning agent. In the high-temperature combustion environment inside the kiln, this part of steam can form superheated steam and decompose. The superheated steam will react with C-containing substances in the gas inside the kiln to generate CO and H2 (i.e., water-gas reaction). CO and H2 are both high-calorific-value combustible gases, which increase the flame temperature, realize the heat supplementation of chemical reaction inside the kiln, and further increase the combustion effect.

[0031] In addition, when in steam cooling mode or combustion air cooling mode, the superheated steam entering the kiln can also generate trace amounts of hydroxide ions, which combine with free calcium ions on the surface of calcium oxide, reducing lattice defects in calcium oxide and improving the quality of quicklime to some extent. More importantly, steam can also suppress local high temperatures, thereby effectively reducing the formation of thermal nitrogen oxides.

[0032] In some embodiments, such as Figures 1 to 7 As shown, the conditioning branch 5 includes a pre-conditioning path 52 and a post-conditioning path 53. The pre-conditioning path 52 is located at the inlet of the steam pipeline 3 and the gas cooling chamber 15, and the post-conditioning path 53 is located at the outlet of the steam pipeline 3 and the gas cooling chamber 15.

[0033] When the gas cooling chamber 15 is in steam cooling mode, the conditioning downstream path 53 is connected to the hollow cavity 11, and the conditioning upstream path 52 is isolated from the hollow cavity 11; the steam introduced into the hollow cavity 11 is superheated steam.

[0034] When the air-cooled chamber 15 is in combustion air cooling mode, the preheating path 52 is connected to the hollow cavity 11, and the postheating path 53 is isolated from the hollow cavity 11; the steam introduced into the hollow cavity 11 is saturated steam.

[0035] It should be noted that conditioning valves 51 are installed on both the pre-conditioning path 52 and the post-conditioning path 53. The opening and closing of the conditioning valves 51 can be used to select whether to open the pre-conditioning path 52 or the post-conditioning path 53. The amount of steam entering the hollow cavity 11 can be controlled by adjusting the opening degree of the conditioning valves 51, so as to keep the steam between 2% and 6%.

[0036] In steam cooling mode, superheated steam is introduced. The superheated steam can react with carbonaceous substances in the kiln fuel gas to generate high-calorific-value combustible gas, thereby achieving heat supplementation for chemical reactions in the kiln, increasing flame temperature and combustion efficiency, and suppressing the generation of thermal nitrogen oxides.

[0037] In the combustion-assisted air cooling mode, saturated steam is introduced. The saturated steam can form superheated steam in the kiln, which can also achieve heat supplementation for chemical reactions in the kiln, improve flame temperature and combustion efficiency, and suppress the generation of thermal nitrogen oxides.

[0038] The above settings can also optimize the calcination environment inside the kiln, reduce calcium oxide lattice defects, and improve the quality of quicklime products.

[0039] Choose either the preheating path 52 or the postheating path 53 according to the cooling mode to ensure that the steam supply status matches the kiln requirements under different cooling modes.

[0040] In steam cooling mode, steam serves as both the cooling medium for beam 1 and the conditioning and heat replenishment functions according to the kiln conditions. While meeting the cooling requirements of the beam, it generates superheated steam for power generation, maximizing the utilization of steam energy and further improving the overall heat utilization efficiency of the system.

[0041] In some embodiments, such as Figures 1 to 7As shown, one end of the preheating path 52 is connected to the hollow cavity 11, and the other end of the preheating path 52 is the discharge end. When the preheating path 52 is connected to the steam pipeline 3, a branch pipeline is set between the preheating path 52 and the steam pipeline 3. A preheating valve 51 and an external network valve 54 are respectively set on both sides of the branch pipeline. When saturated steam is added to the hollow cavity 11 through the preheating path 52, both the preheating valve 51 and the external network valve 54 are opened, and part of the saturated steam enters the hollow cavity 11, while the remaining steam is discharged to the external network pipeline from the external network valve 54. One end of the preheating path 52 is connected to the hollow cavity 11, and the other end is the external network discharge end. The external network discharge end can be connected to other heat exchange pipelines outside the system for production and domestic use, realizing the energy utilization of excess steam.

[0042] In some embodiments, such as Figures 1 to 7 As shown, a first heat exchanger 32 is connected to the steam pipeline 3. The first heat exchanger 32 has a first channel and a second channel. The steam pipeline 3 is connected to the first channel. The second channel of the first heat exchanger 32 is connected to the kiln exhaust gas. Softened water is introduced into the first channel of the first heat exchanger 32. After exchanging heat with the kiln exhaust gas, the softened water forms steam and enters the steam pipeline 3.

[0043] A first heat exchanger 32 connected in series with the kiln exhaust gas is connected to the steam pipeline 3. It uses the waste heat of the kiln exhaust gas to heat softened water to generate steam, realizes the waste heat recovery of the high temperature exhaust gas of the kiln, converts the heat of the exhaust gas into steam energy, reduces the heat loss of the kiln, and improves the heat self-sufficiency rate.

[0044] Steam is generated using softened water, which reduces the problem of pipe and heat exchanger blockage caused by scale buildup in ordinary water, ensures the long-term stable operation of steam pipe 3 and heat exchanger, reduces equipment maintenance costs, and extends the service life of the system.

[0045] Waste heat is used to generate steam, replacing external steam supply, reducing the system's dependence on external energy, realizing internal energy circulation in the kiln, further enhancing energy-saving effects, and reducing energy consumption and cost expenditures during the production process.

[0046] In some embodiments, such as Figures 1 to 7 As shown, a second heat exchanger 6 is connected in series on the first heat exchanger 32, and the second heat exchanger 6 also has a first channel and a second channel; wherein, the second channel of the first heat exchanger 32 is connected to the second channel of the second heat exchanger 6, and the first channel of the second heat exchanger 6 is supplied with gas; the outlet of the first channel of the second heat exchanger 6 is connected to the gas outlet 12 of the hollow cavity 11 through the gas pipeline 7.

[0047] A second heat exchanger 6 is connected in series after the first heat exchanger 32. The secondary waste heat of the kiln exhaust gas is used to preheat the gas, realizing the cascade utilization of the waste heat of the kiln exhaust gas, fully tapping the heat value of the kiln exhaust gas, reducing energy waste, and improving the efficiency of waste heat recovery.

[0048] The increased activity of preheated gas molecules leads to more complete combustion when mixed with combustion air, thus improving gas combustion efficiency. These settings optimize the kiln's calcination environment, promoting thorough calcination of quicklime and increasing both quicklime production and quality.

[0049] The kiln exhaust gas passes through the first heat exchanger 32 and the second heat exchanger 6 in sequence, which can realize the dual functions of steam production and preheating of gas. This allows the waste heat generated by the kiln itself to be returned to the combustion system inside the kiln, thus constructing an internal heat circulation system for the kiln, further reducing the kiln's dependence on external energy and enhancing energy-saving effects.

[0050] In some embodiments, such as Figures 1 to 7 As shown, a third heat exchanger 71 is connected to the gas pipeline 7. The interior of the third heat exchanger 71 also has a first channel and a second channel. The first channel of the third heat exchanger 71 is supplied with gas, and the second channel of the third heat exchanger 71 is connected to the steam pipeline 3 at the outlet of the gas cooling chamber 15 through the gas supplementary heating pipeline 72. The gas supplementary heating pipeline 72 is equipped with a gas supplementary heating valve 73.

[0051] It should be noted that in steam cooling mode, the gas can be supplemented with heat through the third heat exchanger 71. The third heat exchanger 71 is installed on the gas pipeline 7 and connected to the steam outlet of the steam pipeline 3 through the gas supplementary heating pipeline 72, so as to achieve dual preheating of the gas: the second heat exchanger 6 uses the waste heat of the kiln exhaust gas to achieve basic preheating, and the third heat exchanger 71 uses the waste heat of the steam to achieve supplementary heating, ensuring that the gas reaches the optimal combustion temperature.

[0052] It should be noted that the gas is supplemented with heat through the third heat exchanger 71, and the cooling mode is steam cooling. A gas bypass 77 is connected in parallel to the third heat exchanger 71. When the cooling mode is combustion air cooling, the gas passes through the second heat exchanger 6 and directly enters the gas outlet 12 through the gas bypass 77. Specifically, a second bypass valve 78 is connected to the gas bypass 77, and the third heat exchanger 71 is equipped with second switching valves 79 at both the gas inlet and outlet.

[0053] In steam cooling mode, the second switching valve 79 is open, the second bypass valve 78 is closed, and the third heat exchanger 71 can provide supplemental heating for the gas. In combustion air cooling mode, the second switching valve 79 is closed, the second bypass valve 78 is open, and the gas enters the gas outlet 12 through the gas bypass 77 after passing through the second heat exchanger 6.

[0054] The gas supplementary heating valve 73 can control the amount of steam entering the third heat exchanger 71 and dynamically adjust the supplementary heating according to the actual temperature of the gas to ensure the stability of the gas combustion efficiency.

[0055] By utilizing the waste heat of steam pipeline 3 to supplement the gas, the secondary use of steam energy is realized, further exploring the utilization value of waste heat in the system, improving the overall heat utilization efficiency, and making the gas combustion more complete.

[0056] In some embodiments, such as Figures 1 to 7 As shown, a fourth heat exchanger 21 is installed on the cooling oil circulation pipeline 2. The fourth heat exchanger 21 has a first channel and a second channel. The first channel of the fourth heat exchanger 21 is connected to the cooling oil circulation pipeline 2, and the second channel of the fourth heat exchanger 21 is connected to the combustion air pipeline 4. An oil pump is installed on the cooling oil circulation pipeline 2, which can provide power to the oil.

[0057] A fourth heat exchanger 21 is installed on the cooling oil circulation pipeline 2. The high-temperature heat of the beam 1 absorbed by the cooling oil is used to preheat the combustion air, so as to realize the recovery and reuse of the waste heat of the beam 1 cooling. This avoids the direct loss of heat carried away by the cooling oil and converts it into the heat energy of the combustion air to increase the temperature of the combustion air.

[0058] After the preheated combustion air enters the kiln, it can increase the ignition temperature of the gas, promote the complete combustion of the gas, facilitate the stable combustion of low-calorific-value fuels, optimize the calcination environment inside the kiln, and improve the calcination efficiency of lime.

[0059] The waste heat of the cooling oil is returned to the kiln through preheated combustion air, realizing the heat linkage between the cooling process and the combustion process. This allows the heat loss generated by the cooling of beam 1 to be converted into energy supplementation for combustion in the kiln, further enhancing the energy-saving effect and heat self-sufficiency rate of the system.

[0060] In some embodiments, such as Figures 1 to 7 As shown, when the air cooling chamber 15 is in steam cooling mode, the outlet of the fourth heat exchanger 21 is connected to the fifth heat exchanger 22. The fifth heat exchanger 22 has a first channel and a second channel. The first channel of the fifth heat exchanger 22 is connected to the combustion air pipeline 4, and the second channel of the fifth heat exchanger 22 is connected to the steam pipeline 3 at the outlet of the air cooling chamber 15 through the combustion air heat supply pipeline 44. The steam here is superheated steam. The combustion air heat supply pipeline 44 is connected to the combustion air heat supply valve 45.

[0061] In the steam cooling mode, a fifth heat exchanger 22 is connected in series after the fourth heat exchanger 21. The high-temperature waste heat of the steam pipeline 3 is used to reheat the combustion air, achieving dual preheating of the combustion air: the fourth heat exchanger 21 uses the waste heat of the cooling oil to achieve basic preheating, and the fifth heat exchanger 22 uses the waste heat of the steam to achieve supplementary heating, thereby increasing the preheating temperature of the combustion air.

[0062] It should be noted that the combustion air is supplemented with heat through the fifth heat exchanger 22, and the cooling mode is steam cooling. A combustion air bypass 23 is connected in parallel to the fifth heat exchanger 22. When the cooling mode is combustion air cooling, the combustion air passes through the fourth heat exchanger 21 and directly enters the air cooling chamber 15 through the combustion air bypass 23. Specifically, a first bypass valve 231 is connected to the combustion air bypass 23, and the fifth heat exchanger 22 is equipped with first switching valves 221 at both the inlet and outlet of the combustion air.

[0063] In steam cooling mode, the first switching valve 221 is open and the first bypass valve 231 is closed, allowing the fifth heat exchanger 22 to provide supplemental heating for the combustion air. In combustion air cooling mode, the first switching valve 221 is closed and the first bypass valve 231 is open, allowing the combustion air to enter the air cooling chamber 15 via the fourth heat exchanger 21 and the combustion air bypass 23.

[0064] The combustion air supplement valve 45 can dynamically adjust the amount of steam supplied according to the actual temperature of the combustion air, thereby controlling the temperature of the combustion air and ensuring that the combustion air is always in the optimal combustion temperature range.

[0065] By utilizing the waste heat of steam to supplement the combustion air, the steam energy can be reused in multiple scenarios. At the same time, the waste heat of cooling oil and steam can be converted into the heat energy of the combustion air, further exploring the utilization value of waste heat in the system, improving the overall heat utilization efficiency, and ensuring the stability of the kiln calcination effect.

[0066] In some embodiments, such as Figures 1 to 7 As shown, when the air-cooled chamber 15 is in steam cooling mode, the pipe of the steam pipe 3 at the outlet of the cooling chamber can be connected to the steam power generation device 8.

[0067] In steam cooling mode, the high-temperature steam outlet of steam pipeline 3 can be connected to steam power generation device 8 to convert the superheated steam heat energy generated by cooling beam 1 into electrical energy, realizing the heat-work conversion of waste heat, fully exploiting the energy value of steam, and improving the energy utilization of the system. Existing technologies require a boiler to achieve steam power generation, while the above-mentioned configuration in this application eliminates the need for a boiler, saving investment in boilers, reducing the space occupied by boilers, and conserving resources.

[0068] The electricity generated by steam power generation can supply the electrical equipment of the kiln, such as pumps, valves, and monitoring instruments, to achieve self-sufficiency in system energy, reduce dependence on external power grids, and further reduce energy costs and energy consumption in the production process.

[0069] Steam can be used for kiln reheating and conditioning, as well as for power generation, realizing multi-path utilization of steam energy. It can be flexibly switched according to the actual production needs of the kiln, improving the system's flexibility and energy utilization efficiency, while reducing the direct emission of waste heat and improving the environmental friendliness of production.

[0070] In some embodiments, such as Figures 1 to 7 As shown, a quenching pipe connected to the quenching branch 5 is located inside the hollow cavity 11, and the quenching pipe has several quenching outlets. Specifically, the hollow cavity 11 has quenching pipes connected to the pre-quenching path 52 and the post-quenching path 53, respectively. The structures of the quenching pipes connected to the pre-quenching path 52 and the post-quenching path 53 are the same. The quenching pipes are fixed inside the beam 1.

[0071] A conditioning pipe connected to the conditioning branch 5 is installed inside the hollow cavity 11, and several conditioning outlets are provided to allow steam to be evenly injected into the hollow cavity 11 through multiple outlets, thereby achieving uniform mixing of steam and combustion air. The conditioning outlets are spaced apart along the axial direction of the conditioning pipe; on the same circumferential surface, several conditioning outlets are spaced apart along the circumferential direction.

[0072] The design of multiple conditioning outlets increases the contact area between steam and combustion air in the hollow cavity 11, achieving uniform mixing of steam and combustion air, thereby promoting the full reaction of steam and carbonaceous materials and improving the efficiency of water-gas reaction.

[0073] For example, the top of the beam 1 is provided with an upwardly protruding pressure-reducing structure 16, wherein the bottom of the beam 1 has two edges that are both formed along the longitudinal direction, each edge is provided with a protective plate 17 on the outside, and a horizontally outwardly extending widening structure 171 is provided on the outside of the protective plate 17.

[0074] The beam 1 is horizontally positioned within the kiln, and its cross-section is rectangular. Two sharp corners are formed on either side of the top of the beam 1, typically with weld seams. The top of beam 1 may need to bear the weight of materials from a height exceeding 10 meters. Since beam 1 is suspended within the kiln, it is susceptible to deformation or failure due to prolonged pressure. Furthermore, the downward movement of materials causes wear at the corners. To prevent damage to the corners and ensure the stability of beam 1, a pressure-reducing structure 16 enhances the structural strength of beam 1 and provides a flow guide, preventing long-term wear of the weld seams by the material, thereby extending the service life of beam 1.

[0075] In this embodiment, the beam 1 has a longitudinal direction; the cross-section of the beam 1 is rectangular, with mutually perpendicular height and width directions; the longitudinal direction is perpendicular to both the height and width directions. A pressure-reducing structure 16 is disposed at the top of the beam 1 and covers the beam 1 along its longitudinal direction. The pressure-reducing structure 16 can be a pointed-top shape, i.e., its cross-section is triangular; or the top of the pressure-reducing structure 16 can be a curved arch.

[0076] There are also two corners at the bottom of the beam 1. There are usually welds at the corners. The corners are set along the longitudinal direction of the beam 1. Each corner is provided with a guard plate 17. The guard plate 17 also needs to be set along the longitudinal direction of the beam 1. The guard plate 17 can cover the weld and buffer the wear of the lower corner.

[0077] The flame is located at the bottom of the beam 1, and the width of the beam 1 determines the size of the combustion space (which can be considered as a triangular cross-section) of the beam 1. By setting a widening structure 171 on the outside of the guard plate 17, the widening structure 171 is also set along the longitudinal direction of the beam 1 and blocks the guard plate 17. At the same time, the width is significantly increased after the widening structure 171 is combined with the beam 1, which can effectively increase the combustion space and thus increase the combustion intensity.

[0078] The gas pipeline 7 is connected to the burner structure at the gas outlet 12. The burner structure includes a central cylinder 74, which is connected to the gas outlet 12 inside the central cylinder 74. The bottom end extends out of the beam 1, and the top end is connected to the gas pipeline 7. The inner wall of the central cylinder 74 is provided with an inner spiral blade 75, and the outer wall of the central cylinder 74 is provided with an outer spiral blade 76. The outer spiral blade 76 is located inside the combustion air outlet 13.

[0079] After the gas enters the central cylinder 74 through the gas pipeline 7, it forms an inner swirling flow under the guidance of the inner spiral blade 75 and is sprayed downward along the inner wall of the central cylinder 74; at the same time, after the combustion air enters the combustion air outlet 13, it forms an outer swirling flow under the guidance of the outer spiral blade 76 and is sprayed downward along the outer wall of the central cylinder 74.

[0080] The internal and external swirls can significantly increase the contact area between the gas and the combustion air, achieving full and uniform mixing between the two, thereby improving combustion efficiency.

[0081] In this embodiment, the inner spiral blade 75 and the outer spiral blade 76 enable the ejected combustion air and combustion gas to rotate intensely, thereby creating a strong semi-premixed effect. This structure enhances the mixing degree of the combustion gas and combustion air, resulting in faster and more complete combustion.

[0082] The beam 1 can be a rectangular box girder with a width-to-height ratio of 1:1.5 and a length ranging from 6m to 10m depending on the kiln type. 10-18 burner structures can be installed at the bottom of the beam 1. Multiple burner structures can extend beyond the bottom of the beam 1, allowing for the combustion of more fuel per unit time, with the flame burning below the beam 1. This design reduces localized high temperatures generated in the beam 1, thereby utilizing the natural angle of repose space formed under the beam 1 as a combustion chamber to achieve higher combustion intensity.

[0083] For example, in this embodiment, solid fuels such as pulverized coal can also be used. When solid fuels are used, a blunt body, such as a V-shaped or conical baffle, can be set at the outlet end of the burner structure. This blunt body can disperse the concentrated fuel column and form a stable reflux zone behind the blunt body, drawing back the high-temperature flue gas to continuously heat the fuel, ensuring the complete combustion and burnout of the pulverized coal particles.

[0084] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A comprehensive heat utilization system based on a lime kiln and a combustion beam, characterized in that, include: The beam has a hollow cavity inside; at the bottom of the hollow cavity, the beam has a gas outlet and a combustion air outlet coaxially arranged; the side wall of the beam has an oil cooling cavity and a gas cooling cavity that are isolated from each other; the beam has an air passage connecting the gas cooling cavity and the hollow cavity, and the air passage has an air valve. A cooling oil circulation pipeline is connected to the oil cooling chamber; A steam pipeline is connected to the air cooling chamber; a steam valve is provided between the steam pipeline and the air cooling chamber; the steam pipeline also has a conditioning branch connected to the hollow cavity, and a conditioning valve is provided on the conditioning branch; A combustion-supporting air duct is connected to the air cooling chamber; a combustion-supporting valve is provided between the combustion-supporting air duct and the air cooling chamber; the combustion-supporting air duct also has a combustion-supporting branch connected to the hollow cavity, and an air inlet valve is provided on the combustion-supporting branch. The air cooling chamber is either in steam cooling mode or in combustion air cooling mode. When the air cooling chamber is in steam cooling mode, the steam valve, conditioning valve, and air inlet valve are open, while the combustion air valve and air outlet valve are closed. When the air cooling chamber is in combustion air cooling mode, the combustion air valve, air outlet valve, and conditioning valve are open, while the steam valve and air inlet valve are closed.

2. The comprehensive heat utilization system based on a lime kiln and a combustion beam as described in claim 1, characterized in that, The conditioning branch includes a pre-conditioning path and a post-conditioning path. The pre-conditioning path is located at the inlet of the steam pipeline and the gas cooling chamber, and the post-conditioning path is located at the outlet of the steam pipeline and the gas cooling chamber. In the case of steam cooling mode in the gas cooling chamber, the conditioned post-path is connected to the hollow cavity, while the conditioned pre-path is isolated from the hollow cavity; the steam introduced into the hollow cavity is superheated steam. When the air-cooled chamber is in combustion air cooling mode, one end of the preheating path is connected to the hollow cavity, and the other end of the preheating path is the external mesh discharge end; the postheating path is isolated from the hollow cavity; the steam introduced into the hollow cavity is saturated steam.

3. The comprehensive heat utilization system based on a lime kiln and a combustion beam as described in claim 1, characterized in that, When the air-cooled chamber is in steam-cooled mode, the steam pipeline at the outlet of the cooling chamber can be connected to a steam power generation device.

4. The comprehensive heat utilization system based on a lime kiln and a combustion beam as described in claim 1, characterized in that, The steam pipeline is connected to a first heat exchanger, which has a first channel and a second channel. The steam pipeline is connected to the first channel. The second channel of the first heat exchanger is connected to the kiln exhaust gas. In this process, softened water is introduced into the first channel of the first heat exchanger. After exchanging heat with the kiln exhaust gas, the softened water forms steam and enters the steam pipeline.

5. The comprehensive heat utilization system based on a lime kiln and a combustion beam as described in claim 4, characterized in that, A second heat exchanger is connected in series with the first heat exchanger, and the second heat exchanger also has a first channel and a second channel. The second channel of the first heat exchanger is connected to the second channel of the second heat exchanger, and the first channel of the second heat exchanger is supplied with gas; the outlet of the first channel of the second heat exchanger is connected to the gas outlet of the hollow cavity through a gas pipeline.

6. The comprehensive heat utilization system based on a lime kiln and a combustion beam as described in claim 5, characterized in that, The gas pipeline is connected to a third heat exchanger, and the interior of the third heat exchanger also has a first channel and a second channel. The first channel of the third heat exchanger is supplied with gas, and the second channel of the third heat exchanger is connected to the steam pipeline at the outlet of the gas cooling chamber through a gas supplementary heating pipeline. A gas supplementary heating valve is installed on the gas supplementary heating pipeline.

7. The comprehensive heat utilization system based on a lime kiln and a combustion beam as described in claim 1, characterized in that, The cooling oil circulation pipeline is equipped with a fourth heat exchanger, which has a first channel and a second channel. The first channel of the fourth heat exchanger is connected to the cooling oil circulation pipeline, and the second channel of the fourth heat exchanger is connected to the combustion air pipeline.

8. The comprehensive heat utilization system based on a lime kiln and a combustion beam as described in claim 7, characterized in that, When the air cooling chamber is in steam cooling mode, the outlet of the fourth heat exchanger is connected to a fifth heat exchanger, and the fifth heat exchanger has a first channel and a second channel. The first channel of the fifth heat exchanger is connected to the combustion air pipeline, and the second channel of the fifth heat exchanger is connected to the steam pipeline at the outlet of the gas cooling chamber through the combustion air supplementary heating pipeline. The combustion air supplementary heating pipeline is connected to a combustion air supplementary heating valve.

9. A comprehensive heat utilization system based on a lime kiln and a combustion beam as described in claim 1, characterized in that, The top of the beam has an upward-protruding pressure-reducing structure, and the bottom of the beam has two angles that are both formed along the longitudinal direction. Each angle has a protective plate on its outer side, and a widening structure that extends horizontally outward on the outer side of the protective plate.

10. A comprehensive heat utilization system based on a lime kiln and a combustion beam as described in claim 1, characterized in that, The hollow cavity is connected to a conditioning pipe that communicates with the conditioning branch, and the conditioning pipe is provided with several conditioning outlets.

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