Flue gas treatment system matched with secondary aluminum double-chamber furnace
Through the combination of independent flue and equipment, the problem of temperature and composition differences in the flue gas treatment of dual-chamber furnaces is solved, efficient and economical flue gas treatment is achieved, and dust removal equipment is protected.
Patent Information
- Application Number
- CN202421717573.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-19
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-07-19
AI Technical Summary
In the prior art, flue gases of different components and temperatures generated by the dual-chamber furnace are difficult to effectively handle, resulting in increased cleaning costs and easy damage to the bag dust collector.
Independent low-temperature and high-temperature flue are used, and heat exchangers, bag dust collectors, desulfurization towers, denitrification towers and other equipment are respectively set up, combining temperature control and activated carbon and ammonia water injection to achieve effective treatment of different flue gases.
It realizes effective treatment of low-temperature and high-temperature flue gases, reduces cleaning costs, and protects bag dust collectors to avoid equipment damage.
Smart Images
Figure CN223069327U_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of high-quality aluminum alloy green production and processing, and specifically relates to a flue gas treatment system for a regenerative aluminum double-chamber furnace. Background Art
[0002] In the regenerative aluminum process, in order to process high-quality aluminum alloys, a double-chamber furnace structure is considered to separately melt different types of recycled aluminum materials. During this process, due to differences in the heating environment and aluminum material composition in the front and rear furnaces of the double-chamber furnace, the temperature and composition of the generated flue gas also vary greatly. Generally, the front furnace is mainly responsible for remelting unqualified aluminum materials generated during the production and processing of aluminum plants. The flue gas generated by it has a relatively low temperature, and the harmful substances that need to be treated in this low-temperature flue gas are only nitrogen oxides and dust. The rear furnace mainly faces domestic aluminum waste collected from social activities. The flue gas generated by it has a relatively high temperature, and the harmful substances that need to be treated in this high-temperature flue gas are often similar to the exhaust gas generated by burning domestic garbage and require multiple cleaning means to meet the emission standards. In the past, the treatment method for flue gas was to directly mix the two flue gases through a gas collection hood into a single flue pipe and then clean them through a separate set of flue gas treatment systems. This led to over-cleaning of the low-temperature flue gas generated by the front furnace in the subsequent cleaning treatment system, thereby increasing the cleaning cost. At the same time, when desulfurizing and denitrifying, the temperature of the flue gas needs to be above 180°C, while the bag filter, a conventional dust removal means, requires the temperature of the flue gas to be below 250°C. This makes it difficult to control the temperature of the flue gas and easily burns the bag mechanism in the bag filter, which is an urgent problem to be solved at present. Summary of the Invention
[0003] The technical problem to be solved by the present utility model is: to provide a flue gas treatment system for a regenerative aluminum double-chamber furnace to solve the problem of the current lack of an effective treatment device for flue gas with different compositions and temperatures generated in the double-chamber furnace.
[0004] To solve the above problems, the present utility model provides the following technical solutions:
[0005] A flue gas treatment system for a regenerative aluminum double-chamber furnace; it includes a front furnace and a rear furnace; above the front furnace and the rear furnace, there are respectively connected with independent low-temperature flue ducts and high-temperature flue ducts through gas collection hoods; on the low-temperature flue duct, there are successively arranged a heat exchanger group, a first bag filter, and a first smoke exhaust device; on the high-temperature flue duct, there are successively arranged a heat exchanger group, a desulfurization tower, a denitrification tower, a buffer bin, a second bag filter, and a second smoke exhaust device; a branch pipe is installed on the low-temperature flue duct before the first smoke exhaust device through an electric control valve; the other end of the branch pipe is communicated with the buffer bin; a first fan and a second fan are respectively arranged on the low-temperature flue duct and the heat exchanger group; a temperature sensor is also arranged at the gas outlet end of the denitrification tower.
[0006] Preferably, the heat exchanger group includes at least two tubular heat exchangers, which are respectively used to control the flue gas temperature in the low-temperature flue and the high-temperature flue.
[0007] Preferably, an ammonia water spray head is further arranged at the position where the high-temperature flue is connected to the desulfurization tower; the ammonia water spray head is connected to an external ammonia water supplier through an ammonia water pipe.
[0008] Preferably, an activated carbon spray head is further arranged at the position where the high-temperature flue is connected to the denitration tower; the activated carbon spray head is connected to an external activated carbon supplier through an activated carbon spray pipe.
[0009] Preferably, the power of the second fan is greater than that of the first fan; the critical working temperature of the first bag filter is lower than 125 °, and the critical working temperature of the second bag filter is lower than 250 °.
[0010] Preferably, a controller is further included; the controller is respectively connected to the heat exchanger group, the first bag filter and the first smoke exhaust device, the desulfurization tower, the denitration tower, the second bag filter, the second smoke exhaust device, the electric control valve, the first fan, the second fan and the temperature sensor by signals.
[0011] Preferably, both the first fan and the second fan are of a negative pressure fan structure matching the bag filter, and the two are respectively arranged in front of the first smoke exhaust device and the second smoke exhaust device; the electric control valve and the corresponding branch pipe are arranged between the first fan and the first smoke exhaust device.
[0012] Advantages of the present utility model:
[0013] The present invention provides a device capable of effectively treating flue gases with different components and temperatures generated by the front furnace and the rear furnace of a regenerative aluminum double-chamber furnace. For the low-temperature flue gas generated by the front furnace, the present invention uses a heat exchanger to control the temperature and then uses the first bag filter to clean its carbon oxides and dust, so as to meet the emission conditions of the low-temperature flue gas. For the high-temperature flue gas generated by the rear furnace, in addition to using conventional desulfurization and denitration means, the present invention also uses ammonia water injection to remove nitrogen oxides, activated carbon injection to remove dioxins and heavy metal substances, and then uses the second bag filter to perform corresponding dust removal and cleaning; at the same time, aiming at the situation that the filter bags in the second bag filter are easily burned, the present invention also provides a buffer bin, and the electric control valve and the branch pipe are used to control the introduction of the clean flue gas passing through the first bag filter and mix it with the high-temperature flue gas that is too high in temperature and does not meet the requirements of the second bag filter for cooling, and then discharge it through the second bag filter. Description of the Drawings
[0014] Figure 1 is a schematic structural diagram of the invention device in this embodiment;
[0015] Description of reference numerals: 1. Front furnace; 2. Rear furnace; 3. Low-temperature flue; 4. High-temperature flue; 5. Heat exchanger group; 6. First bag filter; 7. First smoke exhaust device; 8. Desulfurization tower; 9. Denitration tower; 10. Buffer bin; 11. Second smoke exhaust device; 13. First fan; 14. Second fan; 15. Ammonia spray head; 16. Activated carbon spray head; 17. Temperature sensor; 18. Second bag filter. Detailed implementation manners
[0016] The present utility model will be further introduced below in conjunction with the accompanying drawings and specific embodiments:
[0017] Embodiment:
[0018] Referring to Figure 1 , this embodiment provides a flue gas treatment system for cooperating with a regenerative aluminum double-chamber furnace; it includes a front furnace 1 and a rear furnace 2; a separate low-temperature flue 3 and a high-temperature flue 4 are respectively connected above the front furnace 1 and the rear furnace 2 through a gas collecting hood; a heat exchanger group 5, a first bag filter 6 and a first smoke exhaust device 7 are sequentially arranged on the low-temperature flue 3; a heat exchanger group 5, a desulfurization tower 8, a denitration tower 9, a buffer bin 10, a second bag filter 18 and a second smoke exhaust device 11 are sequentially arranged on the high-temperature flue 4; a branch pipe is installed on the low-temperature flue 3 before the first smoke exhaust device 7 through an electric control valve 12; the other end of the branch pipe is communicated with the buffer bin 10; a first fan 13 and a second fan 14 are respectively arranged on the low-temperature flue 3 and the heat exchanger group 5; a temperature sensor 17 is further arranged at the air outlet end of the denitration tower 9.
[0019] The heat exchanger group 5 includes at least two tubular heat exchangers, and these heat exchangers are respectively used to control the flue gas temperature in the low-temperature flue 3 and the high-temperature flue 4.
[0020] An ammonia spray head 15 is further arranged at the position where the high-temperature flue 4 is connected to the desulfurization tower 8; the ammonia spray head 15 is connected to an external ammonia supplier through an ammonia pipe.
[0021] An activated carbon spray head 16 is further arranged at the position where the high-temperature flue 4 is connected to the denitration tower 9; the activated carbon spray head 16 is connected to an external activated carbon supplier through an activated carbon spray pipe.
[0022] The power of the second fan 14 needs to be greater than that of the first fan 13; the critical working temperature of the first bag filter 6 is lower than 125 °C, and the critical working temperature of the second bag filter 18 is lower than 250 °C.
[0023] It further includes a controller; the controller is respectively connected to the heat exchanger group 5, the first bag filter 6, the first smoke exhaust device 7, the desulfurization tower 8, the denitration tower 9, the second bag filter 10, the second smoke exhaust device 11, the electric control valve 12, the first fan 13, the second fan 14 and the temperature sensor 17 in a signal connection manner.
[0024] Both the first fan 13 and the second fan 14 are negative-pressure fan structures for cooperating with the bag filter, and the two are respectively arranged before the first smoke exhaust device 7 and the second smoke exhaust device 11; the electric control valve 12 and the corresponding branch pipe are arranged between the first fan 13 and the first smoke exhaust device 7.
[0025] The present utility model also discloses a usage method of a flue gas treatment system for cooperating with a regenerative aluminum double-chamber furnace, which includes the following steps:
[0026] S1. After determining that the connections of all parts are reliable, control the first fan 13 and the second fan 14 to start working through the controller, and at the same time confirm the opening state of the electric control valve 12, so that the outlet end of the first fan 13 is connected to the first smoke exhaust device 7 without passing through the branch pipe.
[0027] S2. Add corresponding aluminum scraps to the front furnace 1 and the rear furnace 2 for melting and casting. At this time, the low-temperature flue gas and the high-temperature flue gas respectively enter the low-temperature flue 3 and the high-temperature flue 4.
[0028] S3. The flue gas in the low-temperature flue 3 is first temperature-controlled by the heat exchanger group 5, then cleaned by the first bag filter 6 and discharged by the first smoke exhaust device 7; the flue gas in the high-temperature flue 4 is temperature-controlled by the heat exchanger and then sequentially passes through the ammonia water spray head 15, the desulfurization tower 8, the activated carbon spray head 16, the denitration tower 9 and the second bag filter 18 and is discharged by the second smoke exhaust device 11 after being cleaned.
[0029] S3. When the temperature sensor 17 shows that the temperature of the high-temperature flue gas after denitration treatment in the denitration tower 9 is greater than the set value; in this embodiment, the set value corresponding to the temperature sensor set in the controller is 250 °C, but in actual use, it can be adjusted according to the specific environment; control the electric control valve 12 by the controller to introduce the low-temperature flue gas cleaned by the first bag filter 6 into the buffer bin along the branch pipe, so that the high-temperature flue gas contacts the low-temperature flue gas in the buffer bin and is mixed and cooled, and at the same time increase the output power of the second fan 14, so that the mixed flue gas is discharged after being cleaned by the second bag filter 18.
Claims
1. A flue gas treatment system for a regenerative aluminum double-chamber furnace, characterized in that: It includes a front furnace (1) and a rear furnace (2); above the front furnace (1) and the rear furnace (2), there are respectively connected with independent low-temperature flue ducts (3) and high-temperature flue ducts (4) through gas collection hoods; on the low-temperature flue duct (3), there are successively arranged a heat exchanger group (5), a first bag filter (6) and a first smoke exhaust device (7); on the high-temperature flue duct (4), there are successively arranged a heat exchanger group (5), a desulfurization tower (8), a denitration tower (9), a buffer bin (10), a second bag filter (18) and a second smoke exhaust device (11); on the low-temperature flue duct (3) before the first smoke exhaust device (7), a branch pipe is installed through an electric control valve (12); the other end of the branch pipe is communicated with the buffer bin (10); on the low-temperature flue duct (3) and the heat exchanger group (5), there are also respectively arranged a first fan (13) and a second fan (14); at the gas outlet end of the denitration tower (9), there is also arranged a temperature sensor (17); the heat exchanger group (5) includes at least two tubular heat exchangers, and these heat exchangers are respectively used to control the flue gas temperature in the low-temperature flue duct (3) and the high-temperature flue duct (4); the power of the second fan (14) is greater than the power of the first fan (13); the critical working temperature of the first bag filter (6) is lower than 125 °C, and the critical working temperature of the second bag filter (18) is lower than 250 °C.
2. The flue gas treatment system for a regenerative aluminum double-chamber furnace according to claim 1, characterized in that: At the position where the high-temperature flue duct (4) is connected to the desulfurization tower (8), there is also arranged an ammonia water spray head (15); the ammonia water spray head (15) is connected with an external ammonia water supplier through an ammonia water pipe.
3. A flue gas treatment system for cooperating with a regenerative aluminum double-chamber furnace according to claim 1, characterized in that: At the position where the high-temperature flue duct (4) is connected to the denitration tower (9), there is also arranged an activated carbon spray head (16); the activated carbon spray head (16) is connected with an external activated carbon supplier through an activated carbon spray pipe.
4. A flue gas treatment system for cooperating with a regenerative aluminum double-chamber furnace according to claim 1, characterized in that: It also includes a controller; the controller is respectively signal-connected with the heat exchanger group (5), the first bag filter (6) and the first smoke exhaust device (7), the desulfurization tower (8), the denitration tower (9), the second bag filter (10), the second smoke exhaust device (11), the electric control valve (12), the first fan (13), the second fan (14) and the temperature sensor (17).
5. A flue gas treatment system for cooperating with a regenerative aluminum double-chamber furnace according to claim 1, characterized in that: Both the first fan (13) and the second fan (14) are negative pressure fan structures that cooperate with the bag filter, and they are respectively arranged before the first smoke exhaust device (7) and the second smoke exhaust device (11); the electric control valve (12) and the corresponding branch pipe are arranged between the first fan (13) and the first smoke exhaust device (7).