System for recycling waste heat of sintered ore based on circular cooler

Abstract

The utility model discloses a sinter waste heat recycling system based on a circular cooler. The sinter waste heat recycling system comprises the circular cooler, a flue gas recycling mechanism, a first-stage heat exchange mechanism and a second-stage heat exchange mechanism. Sintered ore discharged by the sintering machine is conveyed to the circular cooler through the chute; the circular cooler is sequentially divided into a cooling section I, a cooling section II, a cooling section III, a cooling section IV and a cooling section V, and the temperature of sintered ore on the circular cooler is sequentially reduced; air blowers are arranged below the first cooling section, the second cooling section, the third cooling section, the fourth cooling section and the fifth cooling section, and gas collecting hoods are arranged above the first cooling section, the second cooling section, the third cooling section, the fourth cooling section and the fifth cooling section; the flue gas recycling mechanism is used for generating steam by using the waste heat of the sinter in the cooling section I and the cooling section II and generating power; the first-stage heat exchange mechanism is used for recycling preheated sinter in the fourth cooling section; and the second-stage heat exchange mechanism is used for recycling preheated sinter in the third cooling section. The waste heat recovery device recovers heat carried by flue gas in the low-temperature section of the circular cooler, and the waste heat recovery efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of energy conservation and waste heat utilization technology in the iron and steel industry, and in particular to a system for recovering and utilizing waste heat from sintered ore based on an annular cooler. Background Technology

[0002] Sintering is a crucial process in steel manufacturing, accounting for approximately 10% to 16% of the total energy consumption of the entire process, making it a key area for energy conservation and emission reduction in steel production. The sintering process generates a large amount of high-temperature sinter (600–850℃), with high-grade and substantial waste heat resources (approximately 20% of the total waste heat per ton of steel). Efficient recovery and utilization of sintering waste heat is a vital approach to reducing energy consumption in the sintering process and improving energy efficiency in steel manufacturing.

[0003] Currently, the commonly used process is the annular cooler to recover and utilize the heat carried by high-temperature sintered ore. In this process, after exiting the sintering machine, the high-temperature sintered ore enters the annular cooler trolley. The trolley moves slowly forward, and upward airflow from the bottom of the annular cooler cools and exchanges heat with the sintered ore. In existing annular coolers, along the direction of the trolley's movement, the temperature of the sintered ore gradually decreases from high temperature to below 100℃. Figure 1 Typically, the sintering process can be divided into medium-high temperature sections (sections one and two) and medium-low temperature sections (sections three, four, and five) depending on the sintering temperature. Simultaneously, the cooling gas temperature rises to become hot air; along the direction of the trolley's movement, the hot air temperature at the outlet of sections one and two of the annular cooler can be between 500 and 250°C, while the hot air temperature at the outlet of sections three, four, and five is between 200 and 80°C. Currently, the hot air from the medium-high temperature section is generally fed into the boiler to generate steam for power generation, while the flue gas from the medium-low temperature section is either directly discharged or mixed and used for hot air sintering. This not only wastes waste heat resources but also causes some thermal pollution. Utility Model Content

[0004] The purpose of this invention is to provide a system for recovering and utilizing waste heat from sintered ore based on an annular cooler, in order to solve the problems existing in the prior art.

[0005] To achieve the above objectives, this utility model provides a system for recovering and utilizing waste heat from sintered ore based on an annular cooler, comprising:

[0006] The sinter discharged from the sintering machine is transported to the annular cooler via a chute. The annular cooler is sequentially divided into five cooling sections: Cooling Section 1, Cooling Section 2, Cooling Section 3, Cooling Section 4, and Cooling Section 5, with the temperature of the sinter decreasing sequentially. Blowers are installed below each of the five cooling sections, and gas collection hoods are installed above each of them.

[0007] A flue gas recycling mechanism is used to generate steam and generate electricity by utilizing the waste heat of the sinter in the first cooling section and the second cooling section.

[0008] A primary heat exchange mechanism is used to recover the preheating of the sinter in the fourth cooling section and to use the recovered heat to heat the water.

[0009] The secondary heat exchange mechanism is used to recover the preheating of the sinter in the third cooling section and to use the recovered heat to reheat the water heated by the primary heat exchange mechanism.

[0010] Preferably, the flue gas recycling mechanism includes a boiler, which is provided with one exhaust pipe and two intake pipes. The inlets of the two intake pipes are respectively connected to the gas collection hoods above the first cooling section and the second cooling section. The exhaust pipe has two outlets, which are respectively connected to the blowers below the first cooling section and the second cooling section.

[0011] Preferably, the primary heat exchange mechanism includes a primary heat exchanger, which is provided with a water passage and a gas passage. The inlet of the gas passage is connected to the gas collection hood above the cooling section four. The hot flue gas entering the gas passage exchanges heat with the water in the water passage through the primary heat exchanger.

[0012] Preferably, the secondary heat exchange mechanism includes a secondary heat exchanger, which is provided with a water passage two and a gas passage two. The inlet of the gas passage two is connected to the gas collection hood above the cooling section three. The hot flue gas entering the gas passage two exchanges heat with the water in the water passage two through the secondary heat exchanger. The inlet of the water passage two is connected to the outlet of the water passage one.

[0013] Preferably, the outlet of the first air passage is connected to an induced draft fan, and the outlet of the induced draft fan is connected to the outlet of the blower below the third cooling section.

[0014] Preferably, the blower below the third cooling section is a variable frequency blower.

[0015] Preferably, the outlet of the second gas passage is connected to the air inlet of the sintering machine.

[0016] Preferably, a slag discharge trolley is provided below the fifth cooling section.

[0017] Preferably, the boiler is a dual-pressure waste heat boiler.

[0018] Preferably, the induced draft fan is a heat-resistant fan.

[0019] Compared with the prior art, the present invention has the following advantages and technical effects:

[0020] The system for recovering waste heat from sintered ore based on an annular cooler provided by this utility model can effectively recover the heat carried by the flue gas in the low-temperature section of the annular cooler. Compared with the traditional solution, the thermal efficiency of the annular cooler is about 50%. The efficiency is 40%–45%; however, the system for recovering waste heat from sintered ore based on an annular cooler provided by this invention can increase the thermal efficiency to 90%–95%. Efficiency can be increased to 65% to 70%, with significant energy-saving effect; this utility model improves the waste heat recovery efficiency of the ring cooler, realizing the ultimate utilization of the waste heat of sintered ore in the ring cooler. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of an existing waste heat recovery system for an annular cooler.

[0023] Figure 2 This is a schematic diagram of the waste heat recovery and utilization system for sintered ore based on an annular cooler according to this utility model;

[0024] In the diagram: 1. Dual-pressure waste heat boiler; 2. Chute; 3. Cooling section one; 4. Cooling section two; 5. Cooling section three; 6. Cooling section four; 7. Cooling section five; 8. Blower; 9. Outlet pipe; 10. Inlet pipe; 11. Primary heat exchanger; 12. Water passage one; 13. Gas passage one; 14. Secondary heat exchanger; 15. Water passage two; 16. Gas passage two; 17. Exhaust fan. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this utility model can be combined with each other. The described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] like Figure 2 As shown, this utility model provides a system for recovering and utilizing waste heat from sintered ore based on an annular cooler, comprising:

[0027] The sinter discharged from the sintering machine is transported to the annular cooler via chute 2. The annular cooler is divided into cooling section 3, cooling section 4, cooling section 5, cooling section 6, and cooling section 7, with the temperature of the sinter on the annular cooler decreasing sequentially. Blowers 8 are installed below cooling section 3, cooling section 4, cooling section 5, cooling section 4, and cooling section 7, and gas collection hoods are installed above cooling section 3, cooling section 2, cooling section 4, cooling section 5, cooling section 4, and cooling section 7.

[0028] The flue gas recycling mechanism is used to generate steam and generate electricity by utilizing the waste heat of sinter in cooling section 3 and cooling section 4.

[0029] The primary heat exchange mechanism is used to recover the preheating of the sinter in the cooling section 46 and to use the recovered heat to heat the water.

[0030] The secondary heat exchange mechanism is used to recover the preheating of the sinter in the cooling section 35, and to use the recovered heat to reheat the water heated by the primary heat exchange mechanism.

[0031] Further optimization of the scheme: the flue gas recycling mechanism includes a boiler, which is equipped with one exhaust pipe 9 and two intake pipes 10. The inlets of the two intake pipes 10 are respectively connected to the gas collection hoods above the cooling section 3 and the cooling section 4. The exhaust pipe 9 has two outlets, which are respectively connected to the blowers 8 below the cooling section 3 and the cooling section 4.

[0032] The scheme is further optimized. The primary heat exchange mechanism includes a primary heat exchanger 11. The primary heat exchanger 11 is provided with a water passage 12 and an air passage 13. The inlet of the air passage 13 is connected to the gas collection hood above the cooling section 4 6. The hot flue gas entering the air passage 13 exchanges heat with the water in the water passage 12 through the primary heat exchanger 11.

[0033] The scheme is further optimized. The secondary heat exchange mechanism includes a secondary heat exchanger 14. The secondary heat exchanger 14 is provided with a water passage 2 15 and a gas passage 2 16. The inlet of the gas passage 2 16 is connected to the gas collection hood above the cooling section 3 5. The hot flue gas entering the gas passage 2 16 exchanges heat with the water in the water passage 2 15 through the secondary heat exchanger 14. The inlet of the water passage 2 15 is connected to the outlet of the water passage 12.

[0034] The scheme is further optimized so that the outlet of the air passage 13 is connected to the induced draft fan 17, and the outlet of the induced draft fan 17 is connected to the outlet of the blower 8 below the cooling section 3 5.

[0035] The design has been further optimized, with the blower 8 below cooling section 3 (5) being a variable frequency fan.

[0036] The scheme was further optimized so that the outlet of gas passage 216 was connected to the air inlet of the sintering machine.

[0037] The design has been further optimized by installing a slag removal trolley below cooling section 5.

[0038] The design was further optimized, and the boiler was modified to be a dual-pressure waste heat boiler 1.

[0039] The design was further optimized, and the induced draft fan 17 was made into a heat-resistant fan.

[0040] The system for recovering waste heat from sintered ore based on a ring cooler provided by this utility model works as follows: The cooling gas at the bottom of cooling section 3 and cooling section 4 originates from the boiler, and the hot flue gas at the top is introduced to the boiler through the air inlet pipe 10, forming a flue gas recycling system. The heat in the flue gas is used in the boiler to heat water and generate steam for power generation. A gas collection hood and a primary heat exchanger 11 are installed at the top of cooling section 4 6. The gas collection hood collects the hot flue gas from the top outlet of cooling section 4 6 into the gas passage 13 of the primary heat exchanger 11. After entering the primary heat exchanger 11, the hot flue gas undergoes initial heat exchange with the water in the water passage 12. The water after the initial heat exchange is then introduced into the water passage 15 of the secondary heat exchanger 14. The outlet of the gas passage 13 of the primary heat exchanger 11 is connected to the cooling section 3 via an induced draft fan 17. The outlet of blower 8 below section 5 is connected to the flue gas temperature below 120℃ after heat exchange in the first-stage heat exchanger 11. This flue gas mixes with cold air and enters cooling section 3 5, thus preheating the flue gas after heat exchange in the first-stage heat exchanger 11 for utilization. A gas collection hood and a second-stage heat exchanger 14 are installed at the top of cooling section 3 5. The gas collection hood collects the hot flue gas from the top outlet of cooling section 3 5 into the gas passage 2 16 of the second-stage heat exchanger 14. The temperature of the hot flue gas at the top outlet of cooling section 3 5 can reach above 250℃. After entering the second-stage heat exchanger 14, the hot flue gas exchanges heat again with water in the water passage 2 15 to obtain high-temperature hot water for other uses. The flue gas still has some residual heat, which is used to heat the air entering the sintering machine, thus utilizing this residual heat. Blower 8 below cooling section 5 7 serves as a backup blower, used when blowers 8 in the first four sections fail, ensuring the cooling effect of the sinter.

[0041] This invention provides a system for recovering waste heat from sintered ore based on an annular cooler. It effectively recovers and utilizes the heat carried by the flue gas in the low-temperature section of the annular cooler and produces hot water for heating, bringing economic benefits to steel enterprises. Compared to traditional solutions, the thermal efficiency of the annular cooler is approximately 50%. The efficiency is 40%–45%; however, the system for recovering waste heat from sintered ore based on an annular cooler provided by this invention can increase the thermal efficiency to 90%–95%. Efficiency can be increased to 65% to 70%, resulting in significant energy savings.

[0042] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model.

Claims

1. A system for recycling waste heat of sinter based on a ring cooler, characterized in that, The application relates to a sintering machine and a sintering process thereof. The application relates to a sintering machine and a sintering process thereof. The application relates to a sintering machine and a sintering process thereof. The application relates to a sintering machine and a sintering process thereof. The application relates to a sintering machine and a sintering process thereof.

2. The system for recycling waste heat of sinter based on the ring cooler according to claim 1, characterized in that, The application relates to a sintering machine and a sintering process thereof.

3. The system for recycling waste heat of sinter according to the ring cooler of claim 1, characterized in that, The application relates to a sintering machine and a sintering process thereof.

4. The system for recycling waste heat of sinter according to claim 3, characterized in that, The application relates to a sintering machine and a sintering process thereof.

5. The system for recycling waste heat of sinter according to claim 4, characterized in that, The application relates to a sintering machine and a sintering process thereof.

6. The system for recycling waste heat of sinter according to claim 5, characterized in that, The application relates to a sintering machine and a sintering process thereof.

7. The system for recycling waste heat of sinter according to claim 4, characterized in that, The application relates to a sintering machine and a sintering process thereof.

8. The system for recycling waste heat of sinter according to the ring cooler of claim 1, characterized in that, The application relates to a sintering machine and a sintering process thereof. The application relates to a sintering machine and a sintering process thereof. The application relates to a sintering machine and a sintering process thereof. The application relates to a sintering machine and a sintering process thereof. The application relates to a sintering machine and a sintering process thereof. The application relates to a sintering machine and a sintering process thereof. The application relates to a sintering machine and a sintering process thereof. The application relates to a sintering machine and a sintering process thereof. The application relates to a sintering machine and a sintering process thereof. The application relates to a sintering machine and a sintering process thereof. The application relates to a sintering machine and a sintering process thereof. 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10. The system for recycling waste heat of sinter according to claim 5, wherein, The induced draft fan (17) is a heat-resistant fan.

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