Double-flue structure matched with secondary aluminum double-chamber furnace

Abstract

The utility model discloses a double-flue structure matched with a secondary aluminum double-chamber furnace. Belongs to the technical field of metal casting machining auxiliary devices. The front furnace and the rear furnace are provided with a low-temperature flue and a high-temperature flue; the tail end of the low-temperature flue passes through the low-temperature heat exchanger and then is connected to the bag-type dust The tail end of the high-temperature flue passes through the high-temperature heat exchanger and then is connected to the desulfurization and denitrification tower; cooling liquid is supplied to the low-temperature heat exchanger and the high-temperature heat exchanger by a cooling liquid supply device; the high-temperature flue is connected to the intermediate heat exchanger through a branch pipe with a first electric control valve before being connected to the high-temperature heat exchanger; the discharging end of the intermediate heat exchanger is communicated with the discharging end of the high-temperature heat exchanger, and cooling liquid of the intermediate heat exchanger is provided by cooling liquid subjected to heat exchange in the low-temperature heat exchanger; according to the utility model, the problems that a reliable flue gas emission system for the secondary aluminum double-chamber furnace is lacked at present and the flue gas temperature is difficult to effectively control are effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of metal casting processing auxiliary devices, and particularly relates to a double flue structure for cooperating with a regenerative aluminum double-chamber furnace. Background Art

[0002] In the production process of regenerative aluminum, since the raw materials of regenerative aluminum are roughly divided into two categories, one is the processing waste generated by aluminum factories in other production processes, and the other is the waste aluminum materials recycled from society; for these two types of raw materials, there is already a double-chamber melting furnace to meet the different melting and casting requirements between the two; generally, the furnace body is divided into two ends, the front furnace and the rear furnace, by a partition wall, and different types of raw materials are added to the front furnace and the rear furnace respectively during operation; in the front furnace, the processing waste with a relatively high aluminum content (purity) requires a relatively low melting temperature, and at the same time, the waste pollution generated by combustion heating in the furnace chamber is relatively small; while the waste aluminum materials with a relatively low aluminum content (purity) require a high heating temperature, and at the same time, due to more impurities contained, more polluted flue gas containing elements such as sulfur and nitrate will be generated during combustion heating, and in addition, components such as dioxins and dust particles will also be generated; these components are clearly defined by national standards in the industry; and currently, the treatment method for the flue gas discharged from the double-chamber furnace is still the mode of collecting the flue gas generated in the front furnace and the rear furnace uniformly and then treating it, but as mentioned above, there are significant differences in the composition and temperature of the two types of flue gas. Since there are requirements for the reaction temperature with the flue gas during desulfurization and denitrification, and when the flue gas temperature is too high, it is easy to cause the cloth bags in the conventional bag filter to be ignited; therefore, it is necessary to design a green, efficient and low-energy smoke exhaust system in cooperation with the regenerative aluminum double-chamber furnace. Summary of the Invention

[0003] The technical problem to be solved by the present utility model is: to provide a double flue structure for cooperating with a regenerative aluminum double-chamber furnace to solve the problem that there is currently a lack of a reliable flue gas discharge system for the regenerative aluminum double-chamber furnace and the flue gas temperature is difficult to be effectively controlled.

[0004] To solve the above problems, the present utility model provides the following technical solutions:

[0005] A dual flue structure for a regenerative aluminum double-chamber furnace; it includes a front furnace and a rear furnace; a low-temperature flue and a high-temperature flue are respectively installed on the upper tops of the front furnace and the rear furnace through gas collection hoods; in both the low-temperature flue and the high-temperature flue, there are blowers for providing pressure to the flue gas; the tail end of the low-temperature flue passes through a low-temperature heat exchanger and is then connected to a bag filter for installation; the tail end of the high-temperature flue passes through a high-temperature heat exchanger and is then connected to a desulfurization and denitrification tower for installation; both the low-temperature heat exchanger and the high-temperature heat exchanger are tubular heat exchangers, and both are supplied with coolant by a coolant supply device; before the high-temperature flue is connected to the high-temperature heat exchanger, it is also connected to an intermediate heat exchanger through a branch pipe with a first electric control valve; the discharge end of the intermediate heat exchanger is communicated with the discharge end of the high-temperature heat exchanger, and the coolant of the intermediate heat exchanger is provided by the coolant that has undergone heat exchange in the low-temperature heat exchanger.

[0006] Preferably, first temperature sensors are respectively arranged at positions of the low-temperature flue and the high-temperature flue close to the gas collection hood; between the two first temperature sensors and the low-temperature heat exchanger and the high-temperature heat exchanger, branch pipes corresponding to the low-temperature flue and the tail end of the high-temperature flue are respectively installed through a second electric control valve and a third electric control valve.

[0007] Preferably, a second temperature sensor for monitoring the temperature of the flue gas discharged from the high-temperature heat exchanger is also arranged on the high-temperature flue at the discharge end of the high-temperature heat exchanger.

[0008] Preferably, a coolant return pipe is arranged between the low-temperature heat exchanger, the high-temperature heat exchanger and the intermediate heat exchanger and the coolant supply device, and a branch pipe for connecting to the coolant inlet of the intermediate heat exchanger is arranged on the coolant return pipe of the low-temperature heat exchanger through a fourth electric control valve.

[0009] Preferably, it further includes a controller; the controller is respectively connected by signals to the low-temperature heat exchanger, the high-temperature heat exchanger, the coolant supply device, the intermediate heat exchanger, the first electric control valve, the first temperature sensor, the second electric control valve, the third electric control valve, the fourth electric control valve and the second temperature sensor.

[0010] Preferably, a buffer empty bin is also arranged before the high-temperature flue is connected to the desulfurization tower.

[0011] Advantages of the present utility model:

[0012] The present utility model provides a dust removal and smoke exhaust system for a regenerative aluminum double-chamber furnace. By analyzing the characteristics of the low-temperature flue gas and the high-temperature flue gas generated by the corresponding flues on the front furnace and the rear furnace, a smoke exhaust pipeline system with three heat exchangers, corresponding control valves and temperature sensors is further designed, thereby realizing the effective control of the flue temperature, and at the same time realizing the full recycling of the coolant, making it have the effects of green energy conservation and reducing production costs. Description of the drawings

[0013] Figure 1 It is a schematic structural diagram of the utility model device in Embodiment 1;

[0014] Figure 2 It is a schematic diagram of the pipeline layout of the flue in Embodiment 1;

[0015] Figure 3 It is a schematic diagram of the pipeline layout of the heat exchanger and the coolant system in Embodiment 1;

[0016] Figure 4 It is a schematic diagram of the flow direction of flue gas in Embodiment 2;

[0017] Figure 5 It is a schematic diagram of the flow direction of flue gas in Embodiment 3;

[0018] Figure 6 It is a schematic diagram of the flow direction of flue gas in Embodiment 4;

[0019] Figure 7 It is a schematic diagram of the flow direction of flue gas in Embodiment 5;

[0020] Explanation of reference numerals: 1. Front furnace, 2. Rear furnace, 3. Low-temperature flue, 4. High-temperature flue, 5. Second temperature sensor, 6. Low-temperature heat exchanger, 7. Bag filter, 8. High-temperature heat exchanger, 9. Desulfurization and denitrification tower, 10. Coolant supply device, 11. Intermediate heat exchanger, 12. First electric control valve, 13. First temperature sensor, 14. Second electric control valve, 15. Third electric control valve, 16. Fourth electric control valve. Detailed implementation manners

[0021] The following further introduces the present utility model in conjunction with the accompanying drawings and specific embodiments:

[0022] Embodiment 1:

[0023] Referring to Figures 1 to 3 , this embodiment provides a double flue structure for cooperating with a regenerative aluminum double-chamber furnace; it includes a front furnace 1 and a rear furnace 2; a low-temperature flue 3 and a high-temperature flue 4 are respectively installed on the upper tops of the front furnace 1 and the rear furnace 2 through gas collection hoods; fans for providing pressure to the flue gas are arranged in both the low-temperature flue 3 and the high-temperature flue 4; the tail end of the low-temperature flue 4 passes through the low-temperature heat exchanger 6 and then is connected to the bag filter 7 for installation; the tail end of the high-temperature flue 4 passes through the high-temperature heat exchanger 8 and then is connected to the desulfurization and denitrification tower 9 for installation; both the low-temperature heat exchanger 6 and the high-temperature heat exchanger 8 are tubular heat exchangers, and both are provided with coolant by the coolant supply device 10; before the high-temperature flue 4 is connected to the high-temperature heat exchanger 8, it is also connected to the intermediate heat exchanger 11 through a branch pipe with a first electric control valve 12; the discharge end of the intermediate heat exchanger 11 is communicated with the discharge end of the high-temperature heat exchanger 8, and the coolant of the intermediate heat exchanger 11 is provided by the coolant that has undergone heat exchange in the low-temperature heat exchanger 6.

[0024] A first temperature sensor 13 is respectively arranged at positions of the low-temperature flue 3 and the high-temperature flue 4 close to the air collecting hood; between the two first temperature sensors 13 and the low-temperature heat exchanger 6 and the high-temperature heat exchanger 8, branch pipes respectively communicating with the tails of the low-temperature flue 3 and the high-temperature flue 4 are also installed through a second electric control valve 14 and a third electric control valve 15.

[0025] A second temperature sensor 5 for monitoring the temperature of the flue gas discharged from the high-temperature heat exchanger 8 is also arranged on the high-temperature flue 4 at the discharge end of the high-temperature heat exchanger 8.

[0026] A coolant return pipe is arranged between the low-temperature heat exchanger 6, the high-temperature heat exchanger 8, the intermediate heat exchanger 11 and the coolant supply device 10, and a branch pipe for connecting to the coolant inlet of the intermediate heat exchanger 11 is arranged on the coolant return pipe of the low-temperature heat exchanger 6 through a fourth electric control valve 16.

[0027] It further includes a controller; the controller is respectively connected by signals with the low-temperature heat exchanger 6, the high-temperature heat exchanger 8, the coolant supply device 10, the intermediate heat exchanger 11, the first electric control valve 12, the first temperature sensor 13, the second electric control valve 14, the third electric control valve 15, the fourth electric control valve 16 and the second temperature sensor 5.

[0028] A buffer empty bin 17 is also arranged before the high-temperature flue 4 is connected to the desulfurization tower 9. The buffer empty bin 17 is provided to mix two streams of high-temperature flue gas that are shunted and respectively pass through the high-temperature heat exchanger and the intermediate heat exchanger. Since the temperature reduction effect of passing through the intermediate heat exchanger is relatively weaker than that of the high-temperature heat exchanger, it is beneficial to balance the temperature of the flue gas after sufficient mixing.

[0029] When the first electric control valve is opened, the flow rate of the high-temperature flue gas entering the intermediate heat exchanger 10 from the branch pipe through the first electric control valve 12 is smaller than the flow rate of the high-temperature flue gas entering the high-temperature heat exchanger 8.

[0030] Figure 3 The arrow in [[ ]] indicates the flow direction of the coolant.

[0031] Embodiment 2:

[0032] Refer to [[ ]] Figure 4 This embodiment provides the working state of the dust removal and smoke exhaust system when the heat exchanger does not work; mainly when the system is just started, the high-temperature flue and the low-temperature flue both discharge air with low dust, low sulfur, low nitrate compounds and low dioxins.

[0033] When the signals transmitted by the two first temperature sensors 13 to the controller under this operating condition respectively show that the temperature of the flue gas in the low-temperature flue 3 does not exceed 125 °C and the temperature of the flue gas in the high-temperature flue 4 does not exceed 250 °C, the controller controls the second electric control valve 14 and the third electric control valve 15 on the low-temperature flue 3 and the high-temperature flue 4 to respectively introduce the flue gas into the bag filter 7 and the desulfurization and denitration tower 9 through the branch pipes. In this state, the low-temperature heat exchanger 6, the high-temperature heat exchanger 8 and the intermediate heat exchanger 11 do not work.

[0034] Embodiment 3:

[0035] Referring to Figure 5 , this embodiment provides the operating state of the dust removal and smoke exhaust system when only the low-temperature heat exchanger works; this stage is because after the double-chamber furnace is started, low-temperature flue gas exceeding the limit temperature requirement of 125 °C will be generated at the front furnace first and needs to be cooled down.

[0036] Under this operating condition, the signals of the two first temperature sensors 13 show that the temperature of the flue gas in the low-temperature flue 3 exceeds 125 °C, and the temperature of the flue gas in the high-temperature flue does not exceed 250 °C. The controller controls the third electric control valve 15 on the high-temperature flue 4 to introduce the flue gas into the desulfurization and denitration tower 9 through the branch pipe, and controls the second electric control valve 14 on the low-temperature flue 3 to introduce the flue gas into the low-temperature heat exchanger 6. At the same time, the controller controls the coolant supply device 10 to supply coolant to the low-temperature heat exchanger 6. The low-temperature heat exchanger 6 works and inputs the flue gas cooled down to not exceed 125 °C into the bag filter; in this process, the coolant in the low-temperature heat exchanger 6 directly returns to the coolant supply device 10 along the recovery pipeline for circulation;

[0037] Embodiment 4:

[0038] Referring to Figure 6 , this embodiment provides the operating state of the dust removal and smoke exhaust system when only the high-temperature heat exchanger works; this stage is because the temperature of the low-temperature flue gas generated at the front furnace is stable below 125 °C; while the high-temperature flue gas generated at the rear furnace is greater than 250 °C and needs to be cooled down.

[0039] Under this operating condition, the signals of the two first temperature sensors 13 show that the temperature of the flue gas in the low-temperature flue 3 does not exceed 125 °C, and the temperature of the flue gas in the high-temperature flue exceeds 250 °C; the controller controls the second electric control valve 14 on the low-temperature flue 3 to introduce the flue gas into the bag filter 7 through the branch pipe, and controls the third electric control valve 15 on the high-temperature flue 4 to introduce the flue gas into the high-temperature heat exchanger 8. At the same time, the controller controls the coolant supply device 10 to supply coolant to the high-temperature heat exchanger 8. The high-temperature heat exchanger 8 works and inputs the flue gas that has been cooled down and has a temperature in the range of 180 °C to 250 °C into the desulfurization and denitration tower 9; in this process, the coolant in the high-temperature heat exchanger 8 directly returns to the coolant supply device 10 along the recovery pipeline for circulation;

[0040] Example 5:

[0041] Referring to Figure 7 , this embodiment provides the working state of the dust removal and smoke exhaust system when the high and low temperature heat exchangers work simultaneously; at this stage, low temperature flue gas and high temperature flue gas with temperatures above 125°C and above 250°C are generated corresponding to the front furnace and the rear furnace respectively.

[0042] Under this working condition, the signals of the two first temperature sensors 13 show that the temperature of the flue gas in the low temperature flue 3 exceeds 125°C, and the temperature of the flue gas in the high temperature flue exceeds 250°C; the controller controls the second electric control valve 14 and the third electric control valve 15 on the low temperature flue 3 and the high temperature flue 4 to introduce the flue gas into the low temperature heat exchanger 6 and the high temperature heat exchanger 8 respectively, and at the same time controls the coolant supply device 10 to supply coolant to the low temperature heat exchanger 6 and the high temperature heat exchanger 8; the low temperature heat exchanger 6 works and inputs the flue gas cooled to no more than 125°C into the bag filter; the high temperature heat exchanger 8 works and inputs the flue gas cooled and with a temperature of 180°C - 250°C into the desulfurization and denitrification tower 9; during this process, the coolant in the low temperature heat exchanger 6 and the high temperature heat exchanger 8 directly returns to the coolant supply device 10 along the recovery pipeline for circulation;

[0043] Example 6:

[0044] Referring to Figure 8 , this embodiment provides the working state of the dust removal and smoke exhaust system when all the heat exchangers work simultaneously; at this stage, after the high temperature flue gas passes through step S4 and is feedback by the second temperature sensor, its temperature is still greater than 250 degrees Celsius.

[0045] Under this working condition, the controller further opens the first electric control valve 12 to introduce a part of the high temperature flue gas into the intermediate heat exchanger 11, and at the same time controls the fourth electric control valve 16 to introduce the coolant discharged from the low temperature heat exchanger 6 into the intermediate heat exchanger 11 to cool and dissipate the heat of this part of the high temperature flue gas. The flue gas output by the intermediate heat exchanger 11 will be mixed with the flue gas from the high temperature heat exchanger 8 in the buffer empty bin, and its temperature is controlled to be 180°C - 250°C before entering the desulfurization tower.

Claims

1. A double flue structure for a double-chamber aluminum regeneration furnace, comprising a front furnace (1) and a rear furnace (2); characterized in that: A low-temperature flue (3) and a high-temperature flue (4) are respectively installed on the upper top of the front furnace (1) and the rear furnace (2) through a gas collecting hood; fans for providing pressure to the flue gas are provided in both the low-temperature flue (3) and the high-temperature flue (4); the tail end of the low-temperature flue (4) passes through a low-temperature heat exchanger (6) and is connected to a bag filter (7) for installation; the tail end of the high-temperature flue (4) passes through a high-temperature heat exchanger (8) and is connected to a desulfurization and denitrification tower (9) for installation; both the low-temperature heat exchanger (6) and the high-temperature heat exchanger (8) are tubular heat exchangers, and both are provided with coolant by a coolant supply device (10); before the high-temperature flue (4) is connected to the high-temperature heat exchanger (8), it is also connected to an intermediate heat exchanger (11) through a branch pipe with a first electric control valve (12); the intermediate heat exchanger The discharge end of the intermediate heat exchanger (11) is connected to the discharge end of the high-temperature heat exchanger (8), and the cooling liquid of the intermediate heat exchanger (11) is provided by the cooling liquid after heat exchange in the low-temperature heat exchanger (6); first temperature sensors (13) are respectively arranged at positions close to the gas collecting hood of the low-temperature flue (3) and the high-temperature flue (4); branch pipes corresponding to the tail ends of the low-temperature flue (3) and the high-temperature flue (4) are respectively installed between the two first temperature sensors (13) and the low-temperature heat exchanger (6) and the high-temperature heat exchanger (8) through the second electric control valve (14) and the third electric control valve (15); and a second temperature sensor (5) for monitoring the temperature of the flue gas discharged from the high-temperature heat exchanger (8) is also arranged on the high-temperature flue (4) located at the discharge end of the high-temperature heat exchanger (8).

2. The double flue structure for a double-chamber furnace for recycled aluminum according to claim 1, characterized in that: A coolant return pipe is provided between the low-temperature heat exchanger (6), the high-temperature heat exchanger (8), the intermediate heat exchanger (11) and the coolant supply device (10), and a branch pipe for connecting to the coolant inlet of the intermediate heat exchanger (11) is provided on the coolant return pipe on the low-temperature heat exchanger (6) through a fourth electrically controlled valve (16).

3. The double flue structure for a double-chamber furnace for recycled aluminum according to claim 1, characterized in that: The device also includes a controller; the controller is connected to the low-temperature heat exchanger (6), the high-temperature heat exchanger (8), the coolant supply device (10), the intermediate heat exchanger (11), the first electrically controlled valve (12), the first temperature sensor (13), the second electrically controlled valve (14), the third electrically controlled valve (15), the fourth electrically controlled valve (16) and the second temperature sensor (5) respectively via signals.

4. The double flue structure for a double-chamber furnace for recycled aluminum according to claim 1, characterized in that: A buffer empty chamber (17) is also provided before the high-temperature flue (4) is connected to the desulfurization tower (9).

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