Waste heat recovery and dust removal integrated system of sintering machine
By designing the integrated system for waste heat recovery and dust removal of the sintering machine, the problem of high-temperature flue gas waste heat not being fully utilized at the tail of the sintering machine and the feed level and unloading level of the sintering machine are solved, and the integrated design of waste heat recovery and dust removal is achieved, ensuring the ultra-low flue emissions and pollution reduction and carbon reduction effects.
Patent Information
- Application Number
- CN202420405998.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-04
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-03-04
AI Technical Summary
The prior art fails to effectively utilize the high-temperature flue gas waste heat at the tail of the sintering machine and the feed level and discharge level of the ring cooler. The particulate matter in the flue gas wears the fan, resulting in unstable flue gas waste heat recovery and circulation.
An integrated system for waste heat recovery and dust removal of sintering machine is designed. By collecting high-temperature flue gas at the tail of the sintering machine and the feed level and discharge level of the ring cooler, the waste heat exhaust heat of the waste heat of the waste heat of the waste heat of the waste heat of the waste heat of the waste heat containing dust is modified, and waste heat recovery and dust removal are achieved through integrated design.
The waste heat of high-temperature flue gas at the tail of the sintering machine and the feed level and unloading level of the ring-cooling machine are fully recovered, the amount of system transformation is reduced, the problem of particulate matter wear in the flue gas is solved, the fan is protected, the ultra-low flue gas emissions are ensured, and the pollution is significantly reduced.
Smart Images
Figure CN222598529U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of waste heat recovery in the steel industry, and in particular to an integrated system for waste heat recovery and dust removal of a sintering machine. Background Art
[0002] The sintering machine is a project composed of several processes. It is suitable for the sintering operation of large-scale metallurgical sintering plants, and is mainly suitable for the sintering treatment of iron ore powder in large and medium-sized sintering plants.
[0003] In the sintering process, a large amount of sensible heat of sintered ore enters the flue gas from the crushing of sintered ore at the tail of the sintering machine, to the blast cooling of the annular cooler, and then to the unloading of the annular cooler. At present, the sensible heat of sintered ore is only collected at the annular cooler by my country's steel enterprises. The relatively high-temperature flue gas is collected in sections along the annular cooling trolley using a wind collecting hood, and then mixed and passed into the waste heat boiler for power generation. High-temperature flue gases such as the flue gas at the tail of the sintering machine, the flue gas at the receiving port of the annular cooler, and the flue gas at the unloading port of the annular cooler are only dust-removed, and the remaining heat is directly discharged, resulting in a large waste of waste heat resources. At the same time, the high-temperature smoke dust in the flue gas will cause the bag dust collector to burn, and a spark arrester needs to be installed to improve the safety and stability of the dust removal system at the tail of the machine.
[0004] In addition, during the sintering batching and production process, many difficult-to-handle dust-containing vapors will be generated, such as dust-containing vapor from quicklime digestion, dust-containing vapor from the feeding belt, and dust-containing vapor in the sintering machine head hood. The flue gas temperature is about 50-70℃, which is easy to condense and scale, clog the bags, and affect the operation of the dust removal system. It is a dusty wet flue gas that is more difficult to handle in the sintering machine.
[0005] Although the existing technology has partially enhanced the utilization of waste heat from the flue gas at the end of the sintering machine, the existing devices and methods based on the existing devices still have the following problems: 1) The flue gas at the end of the sintering machine contains a large amount of high-temperature molten particles, which are easily condensed on the surface of the water-cooled wall of the waste heat boiler, hindering heat exchange; the solid particles in the flue gas are highly abrasive and can easily erode and wear through the water-cooled wall, causing boiler failure or even production accidents. 2) The flue gas passing through the waste heat boiler still contains a large amount of particulate matter, which directly enters the fan, easily wearing out the fan blades and causing fan failure. As a result, stable recovery of flue gas waste heat and flue gas circulation cannot be achieved, and stable recovery of flue gas waste heat and flue gas circulation cannot be achieved in actual applications. The existing device does not fully utilize the waste heat from the flue gas at the end of the sintering machine. Utility Model Content
[0006] In order to at least partially solve the above problems, the present application provides an integrated system for waste heat recovery and dust removal of a sintering machine.
[0007] The present application provides an integrated system for waste heat recovery and dust removal of a sintering machine, including a sintering trolley and a ring cooler connected to the tail end thereof, a tail hood is arranged between the tail end of the sintering trolley and the feeding end of the ring cooler to close the material dropping space, a tail dust hood is arranged on the top of the tail hood, the tail end of the tail dust hood is connected to the main flue, the main flue is provided with a bypass to connect to a first bag dust collector for dust removal and then to a waste heat boiler, the exhaust gas of the waste heat boiler is discharged through a first fan, and is connected back to the main flue through one or more branch pipes and valves; the main flue is provided with a bag dust collector, a fan, and a chimney in sequence.
[0008] Preferably, the system further comprises a quicklime slaker, a dust hood is arranged on the top of the quicklime slaker and is connected to the main flue through a first pipe; the flue gas outlet of the waste heat boiler is merged into the first pipe through fifteen valves.
[0009] Preferably, a feeding belt is provided at the feeding end of the sintering trolley, a feeding dust hood is provided at the discharging end of the feeding belt, and is connected to the main flue through a second pipe; the flue gas outlet of the waste heat boiler is merged into the second pipe through sixteen valves.
[0010] Preferably, a sintering machine head hood is provided at the front end of the sintering trolley and is connected to the main flue through a third pipeline; the flue gas outlet of the waste heat boiler is merged into the third pipeline through seventeen valves.
[0011] Preferably, the flue gas outlet of the waste heat boiler is connected to the fourth pipeline through eighteen valves, and the fourth pipeline is connected to the main flue.
[0012] Preferably, a dust hood is provided at the feeding port of the annular cooler, and the annular cooler feeding port is connected to the main flue through the flue of the feeding port of the annular cooler.
[0013] Preferably, a discharge hood is provided at the discharge port of the annular cooler, a dust hood of the discharge port of the annular cooler is provided on the discharge hood, and the discharge port flue of the annular cooler is connected to the main flue through the flue of the discharge port of the annular cooler.
[0014] Preferably, a water spray device is installed on the spark arrester in front of the bag dust collector. When the waste heat recovery system fails, the original sintering machine tail dust removal system can be switched back through eleven valves, and the spray device can be turned on to cool the flue gas to prevent the bag dust collector from burning.
[0015] Preferably, the filter element of the first bag filter includes a high temperature resistant filter tube, a metal wire mesh filter cartridge, or a metal fiber felt filter cartridge.
[0016] Preferably, the bag filter is a normal temperature filter bag.
[0017] Based on the existing sintering machine tail dust removal system, this application fully recycles the waste heat of the high-temperature flue gas and returns it to the original sintering machine tail dust removal system after heat exchange, reducing the amount of system modification. At the same time, the waste heat of the exhaust gas from the waste heat boiler is used to heat and modify the dusty wet flue gas that is difficult to handle from the sintering machine, realizing the integrated design of waste heat recovery and dust removal, and achieving significant pollution reduction and carbon reduction effects. Specifically, it is reflected in: 1) Comprehensively collect high-temperature flue gas from the tail of the sintering machine and the receiving and unloading positions of the ring cooler to recover waste heat for utilization; 2) Solve the problem of high-temperature flue gas burning filter bags in the original sintering machine tail dust removal system; 3) Through front-end dust removal and purification, the problem of waste heat boiler wear is solved, and the load for subsequent flue gas bag dust removal is reduced, ensuring ultra-low flue gas emissions; 4) The exhaust gas from the waste heat boiler can be distributed on demand and mixed with dusty water vapor from quicklime digestion, dusty water vapor from the feeding belt, and dusty water vapor in the sintering machine head hood, which is difficult to handle, to increase the flue gas temperature and avoid condensation and scaling. The modified flue gas can be directly introduced into the dust removal system at the tail of the sintering machine, thus solving the problem of purification of dusty wet flue gas that is difficult to handle in the sintering machine. In summary, this application not only effectively utilizes the waste heat of the flue gas at the tail end of the sintering machine and the receiving position of the ring cooler, but also can integrate dust removal and purification of multiple difficult-to-treat flue gases from the sintering machine. It is flexible, easy to adjust, economical and reasonable, and can effectively achieve energy-saving, pollution control and negative carbon production of the sintering dust removal system, supporting the green, low-carbon and high-quality development of the sintering process. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.
[0019] Figure 1 This is a connection diagram of the integrated system for waste heat recovery and dust removal of the sintering machine for this application.
[0020] Figure 2 This is a schematic cross-sectional diagram of the sintering machine waste heat recovery and dust removal integrated system at position AA for this application.
[0021] Figure Number:
[0022] Sintering trolley 1, tail cover 2, tail dust cover 3, fourth valve 4, annular cooler 5, annular cooler receiving port dust cover 6, seventh valve 7, discharge cover 8, discharge port dust cover 9, tenth valve 10, eleventh valve 11, first bag dust collector 12, waste heat boiler 13, first fan 14, fifteenth valve 15, sixteenth valve 16, seventeenth valve 17, eighteenth valve 18, quicklime digester 19, dust cover 20, twenty-one valve 21, feeding belt 22, feeding dust cover 23, twenty-fourth valve 24, sintering machine head cover 25, twenty-sixth valve 26, bag dust collector 27, fan 28, chimney 29, spark arrester 30. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.
[0024] In order to solve the problems that the high-temperature flue gas waste heat at the tail end of the sintering machine and the receiving and unloading positions of the ring cooler is not fully utilized, and there are multiple difficult-to-treat dust and water vapor treatment problems such as dust and water vapor in the digestion of quicklime, dust and water vapor in the feeding belt, and dust and water vapor in the large hood of the sintering machine head, the present application proposes an integrated system for recovering and removing dust from the flue gas at the tail end of the sintering machine and the receiving position of the ring cooler.
[0025] This application provides a sintering machine waste heat recovery and dust removal integrated system, see Figure 1 , Figure 2 , comprising a sintering trolley 1 and a ring cooler 5 connected to the tail end thereof, a tail cover 2 is arranged between the tail end of the sintering trolley 1 and the feeding end of the ring cooler 5 to close the material dropping space, a tail dust hood 3 is arranged on the top of the tail cover 2, the tail end of the tail dust hood 3 is connected to the main flue, the main flue is provided with a bypass to connect to a first bag filter (12) for dust removal and then to a waste heat boiler (13), the exhaust gas of the waste heat boiler (13) is discharged through a first fan (14), and is connected back to the main flue through one or more branch pipes and valves; in this process, the outlet flue gas discharged through the first fan (14) is mixed with one or more difficult-to-treat dust-containing water vapor through a valve to achieve temperature increase and modification treatment, and the mixed gas is connected back to the main flue through a pipe; the main flue is provided with a bag filter 27, a fan 28, and a chimney 29 in sequence.
[0026] In one embodiment of the present application, the system further comprises a quicklime slaker 19 , a dust hood 20 is arranged on the top of the quicklime slaker 19 , and the quicklime slaker 19 is connected to the main flue through a first pipe; the flue gas outlet of the waste heat boiler 13 is merged into the first pipe through a fifteenth valve 15 .
[0027] In one embodiment of the present application, a feeding belt 22 is provided at the feeding end of the sintering trolley 1, a feeding dust hood 23 is provided at the discharging end of the feeding belt 22, and is connected to the main flue through a second pipe; the flue gas outlet of the waste heat boiler 13 is merged into the second pipe through sixteen valves 16.
[0028] In one embodiment of the present application, a sintering machine head hood 25 is provided at the front end of the sintering trolley 1 and connected to the main flue through a third pipe; the flue gas outlet of the waste heat boiler 13 is merged into the third pipe through seventeen valves 17.
[0029] In one embodiment of the present application, the flue gas outlet of the waste heat boiler 13 is connected to the fourth pipeline through eighteen valves 18, and the fourth pipeline is connected to the main flue.
[0030] In one embodiment of the present application, a ring cooler receiving port dust hood 6 is provided at the receiving port of the ring cooler 5, and is connected to the main flue through the ring cooler receiving port flue.
[0031] In one embodiment of the present application, a discharge hood 8 is provided at the discharge port of the annular cooler 5, and an annular cooler discharge port dust suction hood 9 is provided on the discharge hood 8, and the annular cooler discharge port flue is connected to the main flue through the annular cooler discharge port flue.
[0032] In one embodiment of the present application, a water spray device is installed in the spark arrester 30 in front of the bag dust collector 27. When the waste heat recovery system fails, the eleventh valve 11 can be used to switch back to the original sintering machine tail dust removal system, and the spray device can be turned on to cool the flue gas to prevent the bag dust collector 27 from burning.
[0033] In one embodiment of the present application, the filter element of the first bag filter 12 includes a high temperature resistant filter tube, a metal wire mesh filter cartridge, or a metal fiber felt filter cartridge.
[0034] In one embodiment of the present application, the bag filter 27 is a normal temperature filter bag.
[0035] During the implementation of the system provided by the present application, the sintered ore falls from the tail of the sintering trolley 1 and is crushed, and the generated smoke and dust is captured by the tail dust hood 3 provided on the tail cover 2. The crushed sintered ore falls onto the annular cooler 5, and the generated smoke and dust is captured by the dust hood 6 of the annular cooler receiving port. After the sintered ore is cooled by blast air in the annular cooler 5, it falls onto the heavy plate at the discharge location, and the generated smoke and dust is captured by the dust hood 9 of the annular cooler discharge port on the discharge cover 8. The above-mentioned high-temperature smoke and dust are collected and then converged into the main flue of the sintering machine tail flue gas dust removal system. The present application opens a bypass through eleven valves 11 on the main flue of the sintering machine tail flue gas dust removal system, and leads the sintering machine tail flue gas, the annular cooler receiving port flue gas, and the annular cooler discharge port flue gas to the first bag dust collector 12, and the temperature of the collected flue gas is 280-350°C. The eleven valves 11 are three-way plug valves 11. After dust removal and purification, the exhaust dust concentration is <50mg / m 3 , the waste heat boiler 13 is introduced to generate electricity, the exhaust gas temperature is 120-160℃, and it can be discharged through the first fan 14. The outlet flue gas passes through the fifteenth valve 15, the sixteenth valve 16, the seventeenth valve 17, and the eighteenth valve 18, and is distributed into four parts as needed. One part is mixed with the dust-containing water vapor of quicklime digestion captured by the dust hood 20 of the quicklime digester 19, one part is mixed with the dust-containing water vapor of the feeding belt captured by the dust hood 23 of the feeding belt 22, and one part is mixed with the dust-containing water vapor of the sintering machine head captured by the large cover 25 of the sintering machine head. The above-mentioned modified mixed flue gas and the remaining part are all merged into the main flue of the original sintering machine tail dust removal system, and are discharged from the chimney 29 through the fan 28 after dust removal by the bag dust collector 27. The total process exhaust dust concentration is <5mg / m 3 At the same time, a water spray device is installed on the spark arrester 30 in front of the bag filter 27. When the waste heat recovery system fails, the original sintering machine tail dust removal system can be switched back through the eleventh valve 11, and the spray device can be turned on to cool the flue gas, prevent the bag filter 27 from burning, and optimize the sintering machine tail dust removal system. The first fan 14 is a high temperature resistant fan.
[0036] The first bag filter 12 uses high temperature resistant filter elements such as high temperature resistant filter tubes, metal mesh filter cartridges, metal fiber felt filter cartridges, etc. to prevent high temperature smoke from burning the bag and affecting the operation of the dust removal system. The first bag filter 12 is a high temperature resistant bag filter.
[0037] The pipeline connected to the tail dust hood 3 is provided with a fourth valve 4 for controlling the air volume of the tail dust hood.
[0038] The pipeline connected to the blanking dust suction hood 6 is provided with a seventh valve 7 for controlling the air volume of the blanking dust suction hood.
[0039] The pipeline connected to the unloading dust suction hood 9 is provided with a tenth valve 10 for controlling the air volume of the unloading dust suction hood.
[0040] The pipeline connected to the quicklime smelting dust suction hood 20 is provided with twenty-one valves 21 for controlling the air volume of the quicklime smelting dust suction hood.
[0041] The pipeline connected to the feeding belt dust suction hood 23 is provided with twenty-four valves 24 for controlling the air volume of the feeding belt dust suction hood.
[0042] The pipeline connected to the sintering machine head hood 25 is provided with twenty-six valves 26 for controlling the air volume of the sintering machine head hood.
[0043] The bag filter 27 of the original sintering machine tail dust removal system can replace the high-temperature filter bags with ordinary filter bags to reduce operation and maintenance costs because the temperature of the modified flue gas after treatment is relatively low, which can reach below 40°C.
[0044] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims
1. The integrated system of waste heat recovery and dust removal of sintering machine is characterized by: The invention comprises a sintering trolley (1) and a ring cooler (5) connected to the tail end thereof, wherein a tail cover (2) is arranged between the tail end of the sintering trolley (1) and the feeding end of the ring cooler (5) to close the material dropping space, a tail dust hood (3) is arranged on the top of the tail cover (2), the tail end of the tail dust hood (3) is connected to the main flue, the main flue is provided with a bypass to connect to a first bag filter (12) for dust removal and then to connect to a waste heat boiler (13), the exhaust gas of the waste heat boiler (13) is discharged through a first fan (14) and is connected back to the main flue through one or more branch pipes and valves; the main flue is provided with a bag filter (27), a fan (28) and a chimney (29) in sequence.
2. The sintering machine waste heat recovery and dust removal integrated system according to claim 1, characterized in that: The system also includes a quicklime smelter (19), a dust hood (20) is arranged on the top of the quicklime smelter (19), and is connected to the main flue through a first pipeline; the flue gas outlet of the waste heat boiler (13) is connected to the first pipeline through fifteen valves (15).
3. The sintering machine waste heat recovery and dust removal integrated system according to claim 1, characterized in that: A feeding belt (22) is arranged at the feeding end of the sintering trolley (1), and a feeding dust hood (23) is arranged at the discharging end of the feeding belt (22), and the feeding belt (22) is connected to the main flue through a second pipeline; the flue gas outlet of the waste heat boiler (13) is connected to the second pipeline through sixteen valves (16).
4. The sintering machine waste heat recovery and dust removal integrated system according to claim 1, characterized in that: A sintering machine head hood (25) is arranged at the front end of the sintering trolley (1) and is connected to the main flue through a third pipeline; the flue gas outlet of the waste heat boiler (13) is connected to the third pipeline through seventeen valves (17).
5. The sintering machine waste heat recovery and dust removal integrated system according to claim 1, characterized in that: The flue gas outlet of the waste heat boiler (13) is connected to the fourth pipeline through eighteen valves (18), and the fourth pipeline is connected to the main flue.
6. The sintering machine waste heat recovery and dust removal integrated system according to claim 1, characterized in that: The ring cooler (5) is provided with a ring cooler receiving port dust hood (6) at the receiving port, and is connected to the main flue through the ring cooler receiving port flue.
7. The sintering machine waste heat recovery and dust removal integrated system according to claim 1, characterized in that: The discharge port of the annular cooler (5) is provided with a discharge cover (8), and an annular cooler discharge port dust suction cover (9) is provided on the discharge cover (8), and the annular cooler discharge port flue is connected to the main flue through the annular cooler discharge port flue.
8. The sintering machine waste heat recovery and dust removal integrated system according to claim 1, characterized in that: The spark arrester (30) in front of the bag dust collector (27) is additionally equipped with a water spray device.
9. The sintering machine waste heat recovery and dust removal integrated system according to claim 1, characterized in that: The filter elements of the first bag filter (12) include a high temperature resistant filter tube, a metal wire mesh filter cartridge, and a metal fiber felt filter cartridge.
10. The sintering machine waste heat recovery and dust removal integrated system according to claim 1, characterized in that: The bag dust collector (27) is a normal temperature filter bag.