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

By dividing multiple cooling sections in the ring cooler and combining flue gas recycling and multiple heat exchange technology, the problem of insufficient utilization of waste heat of sintered ore is solved, and efficient waste heat recovery and energy-saving effects are achieved.

CN119983834APending Publication Date: 2025-05-13河钢数字技术股份有限公司
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Patent Information

Application Number
CN202510400461.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-01
Publication Date
2025-05-13

AI Technical Summary

Technical Problem

In the existing ring-cooling machine process, the waste heat of the sintered ore has not been fully utilized, resulting in high energy consumption and thermal pollution problems.

Method used

A system based on ring cooling machine is designed. By dividing multiple cooling sections and setting up a blower and air collector, combining a flue gas recycling mechanism, a primary heat exchange mechanism and a secondary heat exchange mechanism, multiple recycling and utilization of sintered ore waste heat is realized.

Benefits of technology

It effectively improves the waste heat recovery efficiency of the ring cold machine, and the thermal efficiency is increased from the traditional 50% to 90% to 95%, significantly saving energy consumption and reducing thermal pollution.

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Abstract

The invention discloses a system for recycling sinter waste heat based on an annular cooler. The system comprises the annular 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 heat carried by the flue gas in the low-temperature section of the circular cooler is recovered, and the waste heat recovery efficiency is improved.
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Description

Technical Field

[0001] The invention relates to the technical field of energy saving and waste heat utilization in the steel industry, and in particular to a system for recycling waste heat of sintered ore based on a ring cooler. Background Art

[0002] Sintering is an important process in steel manufacturing, and its energy consumption accounts for about 10% to 16% of the total energy consumption of the whole process. It is one of the key points of energy conservation and consumption reduction in steel manufacturing. A large amount of high-temperature sintered ore (temperature 600-850℃) will be produced in the sintering process, and the waste heat resources are of high grade and large in total amount (accounting for about 20% of the total waste heat per ton of steel). Efficient recovery and utilization of sintering waste heat is one of the important ways to reduce the energy consumption of the sintering process and improve the energy utilization efficiency of steel manufacturing.

[0003] At present, the ring cooler process is widely used to recycle the heat carried by high-temperature sintered ore. In this process, the high-temperature sintered ore enters the ring cooler trolley after coming out of the sintering machine. The ring cooler trolley moves forward slowly, and the sintered ore is cooled and heat-exchanged by blowing air upward from the bottom of the ring cooler. In the existing ring cooler, along the direction of the trolley movement, the temperature of the sintered ore gradually decreases from high temperature to below 100℃ ( Figure 1 ); Usually, with the different temperatures of the sintered ore, it can be divided into medium-high temperature sections (sections one and two) and medium-low temperature sections (sections three, four and five). At the same time, the temperature of the cooling gas rises to become hot air; along the movement direction of the trolley, the hot air temperature at the outlets of the first and second sections of the ring cooler can be between 500 and 250°C, and the hot air temperature at the outlets of the third, fourth and fifth sections is between 200 and 80°C. At present, the hot air in the medium-high temperature section is generally passed into the boiler to generate steam for power generation, while the flue gas temperature in the medium-low temperature section is directly discharged to the outside, or mixed for hot air sintering, which not only causes a waste of waste heat resources, but also brings certain thermal pollution. Summary of the invention

[0004] The purpose of the present invention is to provide a system for recovering waste heat of sintered ore based on a ring cooler, so as to solve the problems existing in the prior art.

[0005] To achieve the above object, the present invention provides a system for recycling waste heat of sintered ore based on a ring cooler, comprising:

[0006] A ring cooler, the sintered ore discharged from the sintering machine is transported to the ring cooler through a chute; the ring cooler is divided into cooling section 1, cooling section 2, cooling section 3, cooling section 4 and cooling section 5 in sequence, and the temperature of the sintered ore on the ring cooler decreases in sequence; blowers are arranged below the cooling section 1, the cooling section 2, the cooling section 3, the cooling section 4 and the cooling section 5, and air collecting hoods are arranged above the cooling section 1, the cooling section 2, the cooling section 3, the cooling section 4 and the cooling section 5;

[0007] A flue gas recycling mechanism, the flue gas recycling mechanism is used to generate steam and generate electricity by utilizing the waste heat of the sintered ore in the cooling section 1 and the cooling section 2;

[0008] A primary heat exchange mechanism, the primary heat exchange mechanism is used to recover the preheat of the sintered ore in the cooling section 4 and use the recovered heat to heat water;

[0009] A secondary heat exchange mechanism is used to recover the preheat of the sintered ore in the cooling section three and 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 an air outlet pipe and two air inlet pipes, the inlets of the two air inlet pipes are respectively connected to the air collecting hoods above the cooling section one and the cooling section two, and the air outlet pipe is provided with two outlets which are respectively connected to the blowers below the cooling section one and the cooling section two.

[0011] Preferably, the first-stage heat exchange mechanism includes a first-stage heat exchanger, which is provided with a water channel one and an air channel one, the inlet of the air channel one is connected to the air collecting hood above the cooling section four, and the hot flue gas entering the air channel one exchanges heat with the water in the water channel one through the first-stage heat exchanger.

[0012] Preferably, the secondary heat exchange mechanism includes a secondary heat exchanger, which is provided with a water channel 2 and an air channel 2, the inlet of the air channel 2 is connected to the air collecting hood above the cooling section 3, and the hot flue gas entering the air channel 2 exchanges heat with the water in the water channel 2 through the secondary heat exchanger, and the inlet of the water channel 2 is connected to the outlet of the water channel 1.

[0013] Preferably, the outlet of the air passage one 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 cooling section three.

[0014] Preferably, the blower below the cooling section three 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 cooling section five.

[0017] Preferably, the boiler is a double-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 recycling waste heat of sintered ore based on the ring cooler provided by the present invention can effectively recover the heat carried by the flue gas in the low temperature section of the ring cooler. Compared with the traditional solution, the thermal efficiency of the ring cooler is about 50%; The efficiency is 40% to 45%. The system for recycling waste heat from sintered ore based on the ring cooler provided by the present invention can increase the thermal efficiency to 90% to 95%. The efficiency can be increased to 65% to 70%, which has a significant energy-saving effect; the present invention improves the waste heat recovery efficiency of the ring cooler and realizes the ultimate utilization of the waste heat of sintered ore in the ring cooler. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the existing ring cooler waste heat recovery and utilization system;

[0023] Figure 2 It is a schematic diagram of a system for recovering and utilizing waste heat from sintering ore based on a ring cooler according to the present invention;

[0024] In the figure: 1. Double-pressure waste heat boiler; 2. Chute; 3. Cooling section 1; 4. Cooling section 2; 5. Cooling section 3; 6. Cooling section 4; 7. Cooling section 5; 8. Blower; 9. Air outlet pipe; 10. Air inlet pipe; 11. Primary heat exchanger; 12. Water channel 1; 13. Gas channel 1; 14. Secondary heat exchanger; 15. Water channel 2; 16. Gas channel 2; 17. Draft fan. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0026] like Figure 2 As shown, the present invention provides a system for recovering waste heat from sintered ore based on a ring cooler, comprising:

[0027] Annular cooler, the sintered ore discharged from the sintering machine is transported to the annular cooler through the chute 2; the annular cooler is divided into cooling section 1 3, cooling section 2 4, cooling section 3 5, cooling section 4 6 and cooling section 5 7 in sequence, and the temperature of the sintered ore on the annular cooler decreases in sequence; blowers 8 are arranged below cooling section 1 3, cooling section 2 4, cooling section 3 5, cooling section 4 6 and cooling section 5 7, and air collecting hoods are arranged above cooling section 1 3, cooling section 2 4, cooling section 3 5, cooling section 4 6 and cooling section 5 7;

[0028] A flue gas recycling mechanism, which is used to utilize the waste heat of the sintered ore in the cooling section 1 3 and the cooling section 2 4 to generate steam and generate electricity;

[0029] The primary heat exchange mechanism is used to recover the preheat of the sintered ore in the cooling section 46 and use the recovered heat to heat water;

[0030] The secondary heat exchange mechanism is used to recover the preheat of the sintered ore in the cooling section three 5, and use the recovered heat to reheat the water heated by the primary heat exchange mechanism.

[0031] A further optimization scheme is that the flue gas recycling mechanism includes a boiler, which is provided with an exhaust pipe 9 and two intake pipes 10, the inlets of the two intake pipes 10 are respectively connected to the air collecting hoods above the cooling section 1 3 and the cooling section 2 4, and the exhaust pipe 9 is provided with two outlets which are respectively connected to the blowers 8 below the cooling section 1 3 and the cooling section 2 4.

[0032] A further optimized solution is provided, in which the first-stage heat exchange mechanism includes a first-stage heat exchanger 11, and the first-stage heat exchanger 11 is provided with a water channel 12 and a gas channel 13. The inlet of the gas channel 13 is connected to the gas collecting hood above the cooling section 4 6, and the hot flue gas entering the gas channel 13 exchanges heat with the water in the water channel 12 through the first-stage heat exchanger 11.

[0033] A further optimized solution is provided, in which the secondary heat exchange mechanism includes a secondary heat exchanger 14, which is provided with a water channel 15 and a gas channel 16, the inlet of the gas channel 16 is connected to the air collecting hood above the cooling section 3 5, and the hot flue gas entering the gas channel 16 exchanges heat with the water in the water channel 15 through the secondary heat exchanger 14, and the inlet of the water channel 15 is connected to the outlet of the water channel 12.

[0034] To further optimize the solution, the outlet of the air channel 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] To further optimize the solution, the blower 8 below the cooling section three 5 is a variable frequency blower.

[0036] According to a further optimization scheme, the outlet of the second gas channel 16 is connected to the gas inlet of the sintering machine.

[0037] To further optimize the solution, a slag discharge trolley is provided below the cooling section 5 7.

[0038] The solution is further optimized, and the boiler is a double-pressure waste heat boiler 1.

[0039] According to a further optimization scheme, the induced draft fan 17 is a heat-resistant fan.

[0040] The system for recycling waste heat of sintered ore based on a ring cooler provided by the present invention has a working principle as follows: the cooling gas at the bottom of the cooling section 13 and the cooling section 24 comes from the boiler, and the hot flue gas at the top is led to the boiler through the air inlet pipe 10 to form a flue gas recycling system, and the heat in the flue gas is used to heat water in the boiler to generate steam and thus generate electricity; an air collecting hood and a primary heat exchanger 11 are arranged at the top of the cooling section 46, and the hot flue gas at the top outlet of the cooling section 46 is collected into the air channel 13 of the primary heat exchanger 11 by the air collecting hood, and the hot flue gas enters the primary heat exchanger 11 and performs the primary heat exchange with the water in the water channel 12, and the water after the primary heat exchange is connected to the water channel 2 15 of the secondary heat exchanger 14; the outlet of the air channel 13 of the primary heat exchanger 11 is connected to the cooling section 35 through the induced draft fan 17. The outlet of the blower 8 below is connected, and the flue gas temperature after heat exchange in the first-stage heat exchanger 11 is below 120°C. After mixing with the cold air, it enters the cooling section three 5, so that the flue gas after heat exchange in the first-stage heat exchanger 11 can be preheated and utilized; an air collecting hood and a second-stage heat exchanger 14 are set at the top of the cooling section three 5, and the hot flue gas at the top outlet of the cooling section three 5 is collected by the air collecting hood into the gas channel two 16 of the second-stage heat exchanger 14. The hot flue gas temperature at the top outlet of the cooling section three 5 can reach above 250°C. After entering the second-stage heat exchanger 14, the hot flue gas exchanges heat with the water in the water channel two 15 again, thereby obtaining high-temperature hot water for other uses, and the flue gas after heat exchange still has a certain amount of residual heat, which is used to heat the air entering the sintering machine, thereby realizing the utilization of the residual heat of this part of the flue gas. The blower 8 below the cooling section five 7 is used as a reserve blower, and is used when the blower 8 of the first four sections fails to ensure the cooling effect of the sintered ore.

[0041] The system provided by the present invention for recycling waste heat from sintered ore based on the ring cooler effectively recycles the heat carried by the flue gas in the low temperature section of the ring cooler and produces hot water for heating, bringing economic benefits to steel enterprises. Compared with the traditional solution, the thermal efficiency of the ring cooler is about 50%; The efficiency is 40% to 45%. The system for recycling waste heat from sintered ore based on the ring cooler provided by the present invention can increase the thermal efficiency to 90% to 95%. The efficiency can be increased to 65% to 70%, which has a significant energy-saving effect.

[0042] The above are only preferred specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A system for recycling waste heat from sintered ore based on a ring cooler, characterized in that: include: a ring cooler, wherein the sintered ore discharged from the sintering machine is transported to the ring cooler through a chute (2); the ring cooler is divided into a cooling section 1 (3), a cooling section 2 (4), a cooling section 3 (5), a cooling section 4 (6) and a cooling section 5 (7) in sequence, and the temperature of the sintered ore on the ring cooler decreases in sequence; a blower (8) is arranged below the cooling section 1 (3), the cooling section 2 (4), the cooling section 3 (5), the cooling section 4 (6) and the cooling section 5 (7), and an air collecting hood is arranged above the cooling section 1 (3), the cooling section 2 (4), the cooling section 3 (5), the cooling section 4 (6) and the cooling section 5 (7); a flue gas recycling mechanism, the flue gas recycling mechanism being used to utilize the waste heat of the sintered ore in the cooling section 1 (3) and the cooling section 2 (4) to generate steam and generate electricity; a primary heat exchange mechanism, the primary heat exchange mechanism being used to recover the preheat of the sintered ore in the cooling section four (6) and to use the recovered heat to heat water; A secondary heat exchange mechanism is used to recover the preheated sintered ore in the cooling section three (5) and to use the recovered heat to reheat the water heated by the primary heat exchange mechanism.

2. The system for recovering waste heat from sintered ore based on a ring cooler according to claim 1 is characterized in that: The flue gas recycling mechanism comprises a boiler, which is provided with an air outlet pipe (9) and two air inlet pipes (10), the inlets of the two air inlet pipes (10) are respectively connected to the air collecting hoods above the cooling section one (3) and the cooling section two (4), and the air outlet pipe (9) is provided with two outlets which are respectively connected to the blowers (8) below the cooling section one (3) and the cooling section two (4).

3. The system for recovering waste heat from sintered ore based on a ring cooler according to claim 1 is characterized in that: The primary heat exchange mechanism comprises a primary heat exchanger (11), the primary heat exchanger (11) being provided with a water channel one (12) and a gas channel one (13), the inlet of the gas channel one (13) being connected to the gas collecting hood above the cooling section four (6), and the hot flue gas entering the gas channel one (13) exchanges heat with the water in the water channel one (12) through the primary heat exchanger (11).

4. The system for recovering waste heat from sintered ore based on a ring cooler according to claim 3 is characterized in that: The secondary heat exchange mechanism comprises a secondary heat exchanger (14), the secondary heat exchanger (14) being provided with a water channel 2 (15) and a gas channel 2 (16), the inlet of the gas channel 2 (16) being communicated with the gas collecting hood above the cooling section 3 (5), the hot flue gas entering the gas channel 2 (16) being heat-exchanged with the water in the water channel 2 (15) through the secondary heat exchanger (14), the inlet of the water channel 2 (15) being communicated with the outlet of the water channel 1 (12).

5. The system for recovering waste heat from sintered ore based on a ring cooler according to claim 4 is characterized in that: The outlet of the air passage one (13) is connected to an 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 three (5).

6. The system for recovering waste heat from sintered ore based on a ring cooler according to claim 5 is characterized in that: The blower (8) below the cooling section three (5) is a variable frequency blower.

7. The system for recovering waste heat from sintered ore based on a ring cooler according to claim 4 is characterized in that: The outlet of the second gas channel (16) is connected to the gas inlet of the sintering machine.

8. The system for recovering waste heat from sintered ore based on a ring cooler according to claim 1 is characterized in that: A slag discharge trolley is provided below the cooling section five (7).

9. The system for recovering waste heat from sintered ore based on a ring cooler according to claim 2, characterized in that: The boiler is a double-pressure waste heat boiler (1).

10. The system for recovering waste heat from sintered ore based on a ring cooler according to claim 5, characterized in that: The induced draft fan (17) is a heat-resistant fan.