High-temperature tail gas treatment device of electric furnace water granulated slag tank for zinc production plant

Abstract

The utility model discloses a high-temperature tail gas treatment device of an electric furnace water granulated slag tank for a zinc production plant, which comprises a slag flow tank, cooling spray devices, a tail gas recovery treatment device, a cooling water tank, a cooling water tank resource recovery system and a waste heat recovery system, the tail gas recovery processing device is arranged above the cooling spraying device, the cooling water tank is arranged at an outlet of the slag flow tank, the cooling water tank resource recovery systems are arranged above and behind the cooling water tank respectively, and the waste heat recovery system is arranged on the right side of the slag flow tank. The utility model has the functions of solving the potential safety hazard caused by high temperature and reducing the dust content of the tail gas; hot steam and waste water in the water tank are recycled, so that the energy utilization rate is increased, and resource waste is avoided; and waste heat of cooling water is recycled, and the energy utilization rate is increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-temperature tail gas treatment, in particular to a high-temperature tail gas treatment device of an electric furnace slag tank used in a zinc making plant. Background Art

[0002] Zinc is an important metal material, widely used in construction, automobiles, electronics, agriculture and other fields. Zinc smelting is the production process of obtaining pure zinc metal by refining and extracting zinc-containing ore. Electrothermal zinc smelting is a zinc smelting method that uses power as a heat source to directly heat zinc-containing furnace charges and continuously reduce and distill metallic zinc. Zinc steam, slag and high-temperature flue gas can be obtained after electrothermal zinc smelting. The outlet temperature of the electric furnace is usually between 1100℃ and 1150℃. The recovery and treatment of waste heat and waste has always been an important issue in the non-ferrous metal smelting industry to improve energy utilization.

[0003] In the prior art, a water quenching treatment system for zinc smelting slag in an electric furnace is disclosed in a Chinese patent (CN215209152U), which includes a cooling water pool, a water quenching pool and a spiral elevator. A partition is arranged inside the water quenching pool, and a slag passage is left between the lower end of the partition and the bottom of the water quenching pool. The partition divides the internal space of the water quenching pool into a water quenching chamber and a cooling chamber. A rebound plate is arranged in the water quenching chamber, and the rebound plate and the partition are connected by a plurality of telescopic rods, each of which is provided with a spring. A slag chute is arranged on the side wall of the water quenching pool opposite to the rebound plate, and a baffle is obliquely arranged in the water quenching chamber between the slag chute and the rebound plate. A plurality of high-pressure nozzles are arranged on the side wall of the water quenching pool below the slag chute, a slag pushing cylinder is arranged on the outside of the water quenching pool, and a slag pushing plate is arranged after the piston rod end of the slag pushing cylinder passes through the side wall of the water quenching pool, and a spiral coil is arranged in the cooling chamber.

[0004] This method has the following defects: 1. The temperature of the slag brought out by the slag chute is too high, which may easily cause safety hazards when working in the surrounding environment; 2. The dust content in the exhaust gas brought out by the slag chute is relatively high, which may easily cause adverse effects on subsequent cooling equipment; 3. The hot steam and waste water in the water tank are not recycled, resulting in a waste of resources; 4. The cooling water is directly discharged into the water pool without recycling the waste heat.

[0005] To this end, this paper provides a high-temperature tail gas treatment device for an electric furnace slag tank used in a zinc plant. Utility Model Content

[0006] In order to solve the above technical problems, the utility model discloses a high-temperature tail gas treatment device for a water slag trough of an electric furnace used in a zinc manufacturing plant, which adds a slag flow trough spraying device, solves the safety hazard caused by high temperature and reduces the dust content of the tail gas; the hot steam and waste water in the water trough are recycled, the energy utilization rate is improved, and the waste of resources is avoided; the waste heat of cooling water is recycled and utilized, and the thermal efficiency of the device is improved.

[0007] In order to achieve the above-mentioned technical effect, the utility model provides a high-temperature tail gas treatment device for an electric furnace slag trough used in a zinc making plant, including a slag flow trough, a cooling spray device, a tail gas recovery treatment device, a cooling water trough, a cooling water trough resource recovery system, and a waste heat recovery system. The cooling spray device is arranged on both sides above the slag flow trough, the tail gas recovery treatment device is arranged above the cooling spray device, the cooling water trough is arranged at the outlet of the slag flow trough, the cooling water trough resource recovery system is respectively arranged above and behind the cooling water trough, and the waste heat recovery system is arranged on the right side of the slag flow trough; the tail gas recovery treatment device also includes an air collecting hood, an tail gas pipeline, and a condensed water recovery system. The tail gas pipeline is connected to the outlet above the air collecting hood, and the condensed water recovery system is arranged under the air collecting hood The waste heat recovery system further comprises a cold water tank, a cooler, a heat-insulating water tank, a waste heat recovery pipeline, and a tail gas condensate recovery pipeline. The cooler is arranged on the tail gas pipeline, the cold water tank is arranged in front of the inlet end of the cooler, and the heat-insulating water tank is arranged behind the outlet end of the cooler. The cold water tank, the cooler, and the heat-insulating water tank are connected in sequence through the waste heat recovery pipeline, and the front end of the tail gas condensate recovery pipeline is connected to the tail gas pipeline and is located after the cooler.

[0008] Preferably, the cooling spray device further comprises a spray head and a spray water pump, the spray head and the spray water pump are connected via a pipeline and are supplied with water by a cold water tank.

[0009] Preferably, the condensate recovery system also includes a condensate recovery tank, a condensate recovery pipeline, and a stop valve a. The condensate recovery tank is arranged at the lower edge of the air collecting hood. The condensate recovery tank is connected to the cooling water tank through a cooling water recovery pipeline, and a stop valve a is provided at one end connected to the cooling water tank.

[0010] Preferably, a steam trap group is provided on the tail gas condensate recovery pipeline.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0012] The device includes a slag trough, a cooling spray device, an exhaust gas recovery and treatment device, a cooling water trough, a cooling water trough resource recovery system, and a waste heat recovery system. The cooling spray device can spray a water curtain to lower the temperature of the slag trough and absorb dust carried in the slag and exhaust gas, thereby solving the safety hazard caused by the high temperature of the slag, reducing the dust content of the exhaust gas, and reducing the impact of the dust in the exhaust gas on the cooling device; the water trough steam recovery cover can recover the hot steam released from the cooling water trough, and the hot steam is collected by the water trough steam recovery cover and then enters the insulation water tank to recover the waste heat, thereby improving the energy utilization rate; the waste water generated after the cooling water trough cools the slag is discharged into the sedimentation tank through a pipeline, and the recyclable materials are precipitated and separated in the sedimentation tank, thereby avoiding waste of resources; the cooling water recovers the waste heat through the cooler and then enters the insulation water tank, and the insulation water tank can store heat and transfer the heat to the heat-using device, thereby increasing the function of waste heat recovery and utilization and improving the thermal efficiency of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a top view of the utility model;

[0014] Figure 2 It is a right view of the utility model;

[0015] Figure 3 It is a left view of the utility model;

[0016] Figure 4 yes Figure 3 Cross-sectional view of the middle gas collecting hood, cooling spray device, and slag chute a section;

[0017] Figure 5 yes Figure 4 A partial enlarged view of middle b;

[0018] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0019] 1. Slag flow trough; 2. Cooling water trough; 3. Gas collecting hood; 4. Tail gas pipeline; 5. Steam recovery hood; 6. Sedimentation tank; 7. Cold water tank; 8. Cooler; 9. Insulated water tank; 10. Nozzle; 11. Spray water pump; 12. Condensate recovery tank; 13. Stop valve a; 14. Stop valve b; 15. Check valve; 16. Drain valve group; 17. Cold water pump; 18. Heating pump; 19. Raw water inlet; 20. Slag inlet; 21. Heating interface. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0021] like Figures 1 to 4 As shown, in this embodiment, the prior art has the following problems: The inventors found that the prior art has the following defects: First, the temperature of the slag brought out by the slag chute is too high, which may easily cause safety hazards when working in the surrounding environment; Second, the exhaust gas brought out by the slag chute has a high dust content, which may easily cause adverse effects on subsequent cooling equipment; Third, the hot steam and waste water in the water tank are not recycled, resulting in a waste of resources; Fourth, the cooling water is directly discharged into the water pool without recycling the waste heat.

[0022] Therefore, the inventor provides a high-temperature tail gas treatment device for an electric furnace slag trough used in a zinc production plant, including a slag flow trough 1, a cooling spray device, a tail gas recovery treatment device, a cooling water trough 2, a cooling water trough resource recovery system, and a waste heat recovery system. The cooling spray device is arranged on both sides above the slag flow trough 1, the tail gas recovery treatment device is arranged above the cooling spray device, the cooling water trough 2 is arranged at the outlet of the slag flow trough 1, the cooling water trough resource recovery system is respectively arranged above and behind the cooling water trough 2, and the waste heat recovery system is arranged on the right side of the slag flow trough 1; the tail gas recovery treatment device also includes an air collecting hood 3, an tail gas pipeline 4, and a condensed water recovery system. The tail gas pipeline 4 is connected to the outlet above the air collecting hood 3, and the condensed water recovery system is arranged at the lower edge of the air collecting hood 3 and the end is connected to the cooling cooling water tank 2; the cooling water tank resource recovery system also includes a steam recovery hood 5 and a sedimentation tank 6. The steam recovery hood 5 is arranged above the cooling water tank 2, and the top of the steam recovery hood 5 is connected to the insulation water tank 9 through a pipeline. The inlet of the sedimentation tank 6 is connected to the sewage outlet of the cooling water tank 2 through a pipeline; the waste heat recovery system also includes a cold water tank 7, a cooler 8, an insulation water tank 9, a waste heat recovery pipeline, and a tail gas condensate recovery pipeline. The cooler 8 is arranged on the tail gas pipeline 4, the cold water tank 7 is arranged in front of the inlet end of the cooler 8, and the insulation water tank 9 is arranged after the outlet end of the cooler 8. The cold water tank 7, the cooler 8, and the insulation water tank 9 are connected in sequence through the waste heat recovery pipeline, and the front end of the tail gas condensate recovery pipeline is connected to the tail gas pipeline 4 and is located after the cooler 8.

[0023] By adopting the above scheme, when the slag enters the slag flow trough 1 from the slag inlet 20, the cooling spray device on the slag flow trough 1 sprays a water curtain to reduce the temperature and take away part of the dust in the slag tail gas, thereby solving the safety hazard caused by high temperature and reducing the dust content of the tail gas; part of the condensed water generated in the slag flow trough 1 enters the cooling water trough 2 along with the slag, and part of it condenses inside the gas collecting hood 3 and enters the cooling water trough 2 through the condensed water recovery system; the slag after preliminary cooling enters the cooling water trough 2 along the slag flow trough 1 for the next step of cooling, and the hot steam generated during the cooling process is recovered into the insulation water through the steam recovery hood 5 Box 9, the waste water generated in the process can be discharged into the sedimentation tank 6 for sedimentation, and the hot steam and waste water in the water tank are recycled, which improves the energy utilization rate and avoids the waste of resources; the gas collecting hood 3 on the slag flow trough 1 collects the tail gas and passes it into the cooler 8 for tail gas cooling, and the waste heat therein is collected and stored in the insulated water tank 9 by the waste heat recovery system, and the condensed water generated by the tail gas in the pipeline is recovered into the insulated water tank 9 by the tail gas condensed water recovery pipeline. The insulated water tank 9 can transport heat source to the external heat-using device through the heating interface 21, completes the recovery of waste heat in the cooling process, and improves the thermal efficiency of the device.

[0024] Furthermore, the cooling spray device further comprises a spray head 10 and a spray water pump 11, the spray head 10 and the spray water pump 11 are connected via a pipeline and are supplied with water by a cold water tank 7;

[0025] The cooling spray device can spray a water curtain to the slag in the slag chute 1 to reduce the temperature and take away the dust on the tail gas and the slag, thereby solving the safety hazard caused by high temperature and reducing the dust content of the tail gas.

[0026] Furthermore, the condensate recovery system further includes a condensate recovery tank 12, a condensate recovery pipeline, and a stop valve a13. The condensate recovery tank 12 is arranged at the lower edge of the gas collecting hood 3. The condensate recovery tank 12 is connected to the cooling water tank 2 through a cooling water recovery pipeline, and a stop valve a13 is arranged at one end connected to the cooling water tank 2.

[0027] The condensed water recovery tank 12 can collect and recover the condensed water on the gas hood 3, and recover it to the cooling water tank 2 through the condensed water recovery pipeline to evaporate and recover the waste heat, thereby improving the energy utilization rate.

[0028] Furthermore, a steam trap group 16 is provided on the tail gas condensate recovery pipeline;

[0029] The steam trap group 16 can prevent the exhaust gas from leaking along the exhaust gas condensate recovery pipeline, while ensuring that the condensate in the exhaust gas pipeline 4 is discharged in time.

[0030] In summary, the device includes a slag flow trough 1, a cooling spray device, an exhaust gas recovery and treatment device, a cooling water trough 2, a resource recovery system for the cooling water trough 2, and a waste heat recovery system. The cooling spray device can spray a water curtain to lower the temperature of the slag flow trough 1, absorb the dust carried in the slag and the exhaust gas, solve the safety hazard caused by the high temperature of the slag, reduce the dust content of the exhaust gas, and reduce the impact of the dust in the exhaust gas on the cooling device; the steam recovery hood 5 can recover the hot steam released from the cooling water trough 2, and the hot steam is collected by the steam recovery hood 5 and enters the insulation water tank 9 to recover the waste heat, thereby improving the energy utilization efficiency; the waste water generated after the cooling water trough 2 cools the slag is discharged into the sedimentation tank 6 through a pipeline, and the recyclable materials are precipitated and separated in the sedimentation tank 6, thereby avoiding waste of resources; the cooling water enters the insulation water tank 9 after recovering the waste heat through the cooler 8, and the insulation water tank 9 can store heat and transfer the heat to the heat-using device, thereby increasing the function of waste heat recovery and improving the thermal efficiency of the device.

[0031] The working principle of the utility model is as follows: when the slag enters the slag flow trough 1 from the slag inlet 20, the cooling spray device on the slag flow trough 1 sprays a water curtain through the spray water supply pipeline along the process route of the cold water tank 7, the spray water pump 11, and the nozzle 10 to reduce the temperature and take away part of the dust in the tail gas of the slag, thereby solving the safety hazard caused by high temperature and reducing the dust content of the tail gas;

[0032] The condensed water generated during the operation of the cooling spray device, part of which enters the cooling water tank 2 along with the slag, and part of which condenses inside the gas collecting hood 3 and falls along the inner wall of the gas collecting hood 3 into the condensed water recovery tank 12 at the lower edge of the gas collecting hood 3. The condensed water is collected in the condensed water recovery tank 12 and enters the cooling water tank 2 through the condensed water recovery pipeline and the stop valve a13 to evaporate and recover the waste heat.

[0033] After preliminary cooling, the slag enters the cooling water tank 2 along the slag flow trough 1 for the next cooling. The hot steam generated in the cooling process flows through the steam recovery pipeline along the steam recovery cover 5, and successively passes through the stop valve b14 and the check valve 15 to enter the insulation water tank 9 to recover the waste heat; the waste water generated in the cooling process of the slag in the cooling water tank 2 is discharged into the sedimentation tank 6 through the water tank waste water pipeline gate valve for sedimentation, and the hot steam and waste water in the water tank are recycled, thereby improving the energy utilization rate and avoiding the waste of resources;

[0034] The gas collecting hood 3 on the slag trough 1 collects tail gas, and the tail gas is passed into the cooler 8 through the tail gas pipeline 4 for cooling. The waste heat therein is collected and stored in the insulation water tank 9 by the waste heat recovery system. The waste heat recovery system outputs the heat source to the heat-using equipment along the process route of the raw water inlet 19, the cold water tank 7, the cold water pump 17, the cooler 8, the insulation water tank 9, the heat supply pump 18, and the heating interface 21. The condensed water generated by the tail gas in the pipeline is recovered into the insulation water tank 9 through the condensed water recovery pipeline through the tail gas pipeline 4, the steam trap group 16, and the insulation water tank 9 process route, completing the recovery of waste heat in the cooling process and improving energy utilization.

[0035] At this point, the entire device has completed the treatment of the high-temperature exhaust gas and transported the exhaust gas to the next process.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-temperature tail gas treatment device for a slag trough of an electric furnace used in a zinc production plant, comprising a slag trough (1), a cooling spray device, a tail gas recovery treatment device, a cooling water trough (2), a cooling water trough resource recovery system, and a waste heat recovery system, wherein the cooling spray device is arranged on both sides above the slag trough (1), the tail gas recovery treatment device is arranged above the cooling spray device, the cooling water trough (2) is arranged at the outlet of the slag trough (1), the cooling water trough resource recovery system is respectively arranged above and behind the cooling water trough (2), and the waste heat recovery system is arranged on the right side of the slag trough (1); characterized in that: The exhaust gas recovery and treatment device further comprises an air collecting hood (3), an exhaust gas pipeline (4), and a condensed water recovery system, wherein the exhaust gas pipeline (4) is connected to the upper outlet of the air collecting hood (3), and the condensed water recovery system is arranged at the lower edge of the air collecting hood (3) and the end thereof is connected to the cooling water tank (2); the cooling water tank resource recovery system further comprises a steam recovery hood (5) and a sedimentation tank (6), wherein the steam recovery hood (5) is arranged above the cooling water tank (2), and the upper part of the steam recovery hood (5) is connected to the insulating water tank (9) through a pipeline, and the inlet of the sedimentation tank (6) is connected to the sewage discharge of the cooling water tank (2). The exhaust gas pipeline (4) is connected to the exhaust gas outlet by a pipeline; the waste heat recovery system further comprises a cold water tank (7), a cooler (8), an insulating water tank (9), a waste heat recovery pipeline, and an exhaust gas condensate recovery pipeline; the cooler (8) is arranged on the exhaust gas pipeline (4); the cold water tank (7) is arranged before the inlet end of the cooler (8); the insulating water tank (9) is arranged after the outlet end of the cooler (8); the cold water tank (7), the cooler (8), and the insulating water tank (9) are connected in sequence by the waste heat recovery pipeline; and the front end of the exhaust gas condensate recovery pipeline is connected to the exhaust gas pipeline (4) and is located after the cooler (8).

2. The high-temperature tail gas treatment device of the electric furnace slag tank for zinc production plant according to claim 1 is characterized by: The cooling spray device further comprises a spray head (10) and a spray water pump (11); the spray head (10) and the spray water pump (11) are connected via a pipeline and are supplied with water by a cold water tank (7).

3. The high-temperature tail gas treatment device of the electric furnace slag tank for zinc production plant according to claim 1 is characterized by: The condensate recovery system further comprises a condensate recovery tank (12), a condensate recovery pipeline, and a stop valve a. The condensate recovery tank (12) is arranged at the lower edge of the gas collecting hood (3). The condensate recovery tank (12) is connected to the cooling water tank (2) via a cooling water recovery pipeline, and a stop valve a (13) is provided at one end connected to the cooling water tank (2).

4. The high-temperature tail gas treatment device of the electric furnace slag tank for zinc production plant according to claim 1 is characterized by: The tail gas condensate water recovery pipeline is provided with a steam trap group (16).

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