Energy-saving purification device for acid production

Abstract

The utility model discloses an energy-saving purification device for acid production, and relates to the technical field of acid production. The device comprises a scrubber, a packed tower, an electric demister, a high-level water tank and an electric demister cleaning assembly, wherein the scrubber, the packed tower and the electric demister are sequentially communicated through a gas channel so as to sequentially purify flue gas; the high-level water tank provides spraying liquid for the scrubber and the packed tower; a water outlet of the packed tower and a water outlet of the electric demister are communicated with a liquid supplementing opening of the scrubber through liquid supplementing pipes; the electric demister cleaning assembly comprises a flushing pipe and a nozzle arranged corresponding to the cathode of the electric demister, the water inlet end of the flushing pipe is communicated with the water outlet of the packed tower, the water inlet end of the nozzle is communicated with the water inlet end of the flushing pipe, and the water outlet end of the nozzle is communicated with the liquid supplementing opening of the washer. In the purification process, drainage of the packed tower can be used for flushing the electric demister, so that external production water entering the purification system is reduced, the sewage treatment capacity is reduced, and the production cost is reduced; and meanwhile, the overall circulation liquid expansion caused by high water content in production materials is improved.

Description

Technical Field

[0001] This utility model relates to the field of acid production technology, and more specifically to an energy-saving purification device for acid production. Background Technology

[0002] In industrial smelting, acid production systems are an essential process. These systems typically include flue gas purification systems, dry absorption systems, conversion systems, and finished acid storage systems. The purification system primarily utilizes high-efficiency scrubbers and the circulating liquid in packed towers to lower the temperature of the smelting flue gas, remove dust and impurities, and then uses the electric field of an electrostatic precipitator to remove acid mist from the flue gas.

[0003] After a period of use, the cathode wire of the electrostatic precipitator accumulates a large amount of impurity particles, requiring daily rinsing with a large amount of production water. The resulting acidic wastewater is then piped back to the high-efficiency scrubber in the purification system. After washing, it is transported to the acidic wastewater treatment plant via an external discharge branch. Furthermore, in northern production processes, the high water content of the smelting materials necessitates maintaining high liquid levels in all towers and tanks of the overall purification system. Excess water must be directly discharged to the acidic wastewater treatment plant, increasing the load on the wastewater treatment system, raising costs, and impacting normal production. Utility Model Content

[0004] In view of this, the present invention aims to provide an energy-saving purification device for acid production to at least partially solve the problems in the prior art, such as excessive water consumption caused by using production water to flush the electrostatic precipitator, increased treatment costs, high water content in the smelting production materials, high liquid levels in each tower of the overall purification system, and the need for excess water to be directly discharged to the waste acid wastewater treatment plant for treatment, thereby increasing the load on waste acid wastewater treatment, increasing costs, and affecting normal production.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An energy-saving purification device for acid production includes: a scrubber, a packed tower, an electrostatic precipitator, an elevated water tank, and a cleaning assembly for the electrostatic precipitator. The scrubber, the packed tower, and the electrostatic precipitator are sequentially connected via air ducts to purify flue gas in sequence. The elevated water tank provides spray liquid to the scrubber and the packed tower. The drain outlets of the packed tower and the electrostatic precipitator are both connected to the liquid inlet of the scrubber via liquid replenishment pipes.

[0007] The electrostatic precipitator cleaning assembly includes a flushing pipe and nozzles arranged corresponding to the cathode of the electrostatic precipitator. The water inlet end of the flushing pipe is connected to the drain outlet of the packed tower, the water inlet end of the nozzle is connected to the water inlet end of the flushing pipe, and the water outlet end is connected to the liquid replenishment port of the scrubber.

[0008] The beneficial effects that this utility model can achieve are as follows: During the purification process, the packed tower can be used to drain water to flush the electrostatic precipitator, reducing the amount of external production water entering the purification system, reducing the amount of wastewater treated, and lowering production costs; at the same time, the circulating liquid of the packed tower and the electrostatic precipitator can be used as a spray liquid replenishment for the scrubber, reducing the use of production water during the purification process, and improving the situation where the high water content in the production materials causes the overall circulating liquid to expand, increasing the amount of discharge and thus increasing the load and cost of the acid wastewater treatment.

[0009] Preferably, the packed tower includes a primary packed tower and a secondary packed tower. The air inlet of the primary packed tower is connected to the air outlet of the scrubber via an air duct, and its drain outlet is connected to the liquid inlet of the scrubber via a liquid replenishment pipe. The air inlet of the secondary packed tower is connected to the air outlet of the primary packed tower, and its drain outlet is connected to the liquid inlet of the primary packed tower via a liquid replenishment pipe. The air inlet of the electrostatic precipitator is connected to the air outlet of the secondary packed tower, and the water inlet of the flushing pipe is connected to the drain outlet of the secondary packed tower.

[0010] Preferably, a packing tower circulation pump is also provided, and the drain outlets of the primary packing tower and the secondary packing tower are connected to their own liquid inlets through the packing tower circulation pump.

[0011] Preferably, a heat exchanger is installed between the inlet of the primary packed tower and the secondary packed tower and the corresponding circulating pump of the packed tower.

[0012] Preferably, the scrubber includes a primary scrubber and a secondary scrubber. The air outlet of the primary scrubber is connected to the air inlet of the primary packed tower via an air duct, and the drain outlet of the primary packed tower is connected to the liquid inlet of the primary scrubber via a liquid replenishment pipe. The air inlet of the secondary scrubber is connected to the air outlet of the primary packed tower, and its drain outlet is connected to the liquid inlet of the primary packed tower via a liquid replenishment pipe. The drain outlet of the secondary packed tower is connected to the liquid inlet of the secondary scrubber via a liquid replenishment pipe. The drain outlet of the electrostatic precipitator is connected to the liquid inlet of the primary scrubber via a liquid replenishment pipe.

[0013] Preferably, a washing machine circulation pump is also provided, and the drain outlets of the primary and secondary washing machines are connected to their own liquid inlets through the washing machine circulation pump.

[0014] Preferably, the electrostatic precipitator includes a primary electrostatic precipitator and a secondary electrostatic precipitator. The air inlet of the primary electrostatic precipitator is connected to the air outlet of the secondary packed tower through an air duct. The air inlet of the secondary electrostatic precipitator is connected to the air outlet of the primary electrostatic precipitator through an air duct. The drain outlets of the primary and secondary electrostatic precipitators are connected to the liquid replenishment port of the primary scrubber through a liquid replenishment pipe.

[0015] Preferably, the outlet of the secondary electrostatic precipitator is equipped with a water seal.

[0016] Preferably, a waste acid treatment component is also provided, which includes a desorption tower, a settling tank and a dilute acid tank. The inlet of the desorption tower is connected to the outlet of the primary scrubber, and the outlet is connected to the inlet of the primary packed tower. The inlet of the settling tank is connected to the outlet of the desorption tower, and the inlet of the dilute acid tank is connected to the overflow outlet of the settling tank.

[0017] Preferably, the waste acid treatment assembly further includes a filter press, which is connected between the settling inlet of the settling tank and the inlet of the dilute acid tank.

[0018] As can be seen from the above technical solution, compared with the prior art, this utility model discloses an energy-saving purification device for acid production. It utilizes the clean circulating liquid generated by the two-stage packed tower to clean the electrostatic precipitator, reducing the amount of production water added to the purification system, thereby lowering the cost of production water usage. Simultaneously, it reduces the generation of waste acid and the treatment load on the waste acid wastewater. By enabling the cross-contamination and reuse of the circulating liquid within the entire purification device, when replenishment is needed, the circulating liquid from the subsequent stage can be used to replenish the spray liquid required by the preceding stage, reducing the use of external water for replenishment. This improves the situation where the expansion of the overall circulating liquid keeps each tower at a high water level, requiring external discharge, which increases production costs and affects normal production. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 This utility model provides a schematic diagram of an energy-saving purification device for acid production.

[0021] In the diagram: 1. High-level water tank, 2. Primary scrubber, 3. Primary packed tower, 4. Secondary scrubber, 5. Secondary packed tower, 6. Primary electrostatic precipitator, 7. Secondary electrostatic precipitator, 8. Packed tower circulation pump, 9. Heat exchanger, 10. Scrubber circulation pump, 11. Desorption tower, 12. Settling tank, 13. Dilute acid tank, 14. Filter press, 15. Flushing pipe, 16. Nozzle. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] Please see Figure 1 This utility model discloses an energy-saving purification device for acid production, including: a scrubber, a packed tower, an electrostatic precipitator, a high-level water tank 1, and an electrostatic precipitator cleaning assembly. The scrubber, packed tower, and electrostatic precipitator are connected in sequence through an air duct to purify the flue gas in sequence. The high-level water tank 1 provides spray liquid to the scrubber and the packed tower. The bottom of the scrubber, the packed tower, and the electrostatic precipitator are all provided with sedimentation tanks for collecting and spraying water. The sedimentation tanks are provided with a drain outlet at the top and a sewage outlet at the bottom. The sediment discharged from the sewage outlet is introduced into a wastewater and waste acid treatment station for treatment. The drain outlets of the packed tower and the electrostatic precipitator are both connected to the liquid replenishment port of the scrubber through a liquid replenishment pipe.

[0026] The electrostatic precipitator cleaning assembly includes a flushing pipe 15 and nozzles 16 arranged corresponding to the cathode of the electrostatic precipitator. The inlet of the flushing pipe 15 is connected to the drain outlet of the packed tower, the inlet of the nozzles 16 is connected to the inlet of the flushing pipe 15, and the outlet is connected to the replenishment port of the scrubber. During the purification process, the supernatant with low impurity content discharged from the drain outlet of the secondary packed tower 5 can be used to clean the electrostatic precipitator, eliminating the need for additional production water, reducing production water consumption, thereby reducing the amount of acidic wastewater generated, lowering production costs, and improving environmental protection and energy-saving effects. Furthermore, by using the replenishment pipe to achieve series connection of circulating liquid between various devices through pumping or overflow, the relatively clean supernatant discharged from the drain outlet of the packed tower or the drain outlet of the electrostatic precipitator can be used as spray replenishment liquid for the scrubber, reducing the direct discharge of excess water from each device, which increases the treatment load, and reducing the use of external production water for replenishment, thus saving water resources.

[0027] Specifically, the packed tower includes a primary packed tower 3 and a secondary packed tower 5. The air inlet of the primary packed tower 3 is connected to the air outlet of the scrubber through an air duct, and its drain outlet is connected to the liquid inlet of the scrubber through a liquid replenishment pipe. The air inlet of the secondary packed tower 5 is connected to the air outlet of the primary packed tower 3, and its drain outlet is connected to the liquid inlet of the primary packed tower 3 through a liquid replenishment pipe. The air inlet of the electrostatic precipitator is connected to the air outlet of the secondary packed tower 5, and the water inlet of the flushing pipe 15 is connected to the drain outlet of the secondary packed tower 5. The two-stage packed tower enhances the purification effect.

[0028] Specifically, a packed tower circulation pump 8 is also provided. The drain outlets of the primary packed tower 3 and the secondary packed tower 5 are connected to their own liquid inlets through the packed tower circulation pump 8, so as to realize the self-circulation of the spray liquid in the packed tower.

[0029] Specifically, heat exchangers 9 are installed between the inlet of the primary packed tower 3 and the secondary packed tower 5 and the corresponding circulating pump 8. This reduces the temperature of the circulating supernatant in the primary packed tower 3 to 55-60℃ and the circulating supernatant in the secondary packed tower 5 to below 35℃, thus meeting their spraying temperature requirements. Furthermore, because the circulating supernatant in the secondary packed tower 5 is at a lower temperature, it is more suitable for cleaning the electrostatic precipitator, preventing damage to the precipitator under high-temperature circulating liquid cleaning.

[0030] Specifically, the scrubber includes a primary scrubber 2 and a secondary scrubber 4. The air outlet of the primary scrubber 2 is connected to the air inlet of the primary packed tower 3 via an air duct, and the drain outlet of the primary packed tower 3 is connected to the liquid inlet of the primary scrubber 2 via a liquid replenishment pipe. The air inlet of the secondary scrubber 4 is connected to the air outlet of the primary packed tower 3, and its drain outlet is connected to the liquid inlet of the primary packed tower 3 via a liquid replenishment pipe. The drain outlet of the secondary packed tower 5 is connected to the liquid inlet of the secondary scrubber 4 via a liquid replenishment pipe. The drain outlet of the electrostatic precipitator is connected to the liquid inlet of the primary scrubber 2 via a liquid replenishment pipe. The two-stage scrubber enhances the purification effect.

[0031] Specifically, a scrubber circulation pump 10 is also provided. The drain outlets of the primary scrubber 2 and the secondary scrubber 4 are connected to their own liquid inlets through the scrubber circulation pump 10 to realize the self-circulation of the scrubber spray liquid.

[0032] Specifically, the electrostatic precipitator includes a primary electrostatic precipitator 6 and a secondary electrostatic precipitator 7. The air inlet of the primary electrostatic precipitator 6 is connected to the air outlet of the secondary packed tower 5 through an air duct; the air inlet of the secondary electrostatic precipitator 7 is connected to the air outlet of the primary electrostatic precipitator 6 through an air duct; the drain outlets of the primary electrostatic precipitator 6 and the secondary electrostatic precipitator 7 are connected to the liquid replenishment port of the primary scrubber 2 through a liquid replenishment pipe, thereby enhancing the purification effect by using two stages of electrostatic precipitators.

[0033] Specifically, a water seal is installed at the outlet of the secondary electrostatic precipitator 7. Since the purification process operates under negative pressure, the water seal prevents damage to gas pipelines and equipment caused by suction under negative pressure.

[0034] Specifically, a waste acid treatment component is also provided, which includes a desorption tower 11, a settling tank 12, and a dilute acid tank 13. The inlet of the desorption tower 11 is connected to the outlet of the primary scrubber 2, and the outlet is connected to the inlet of the primary packed tower 3. The settling tank 12 is a conical settling tank, and its inlet is connected to the outlet of the desorption tower 11. The inlet of the dilute acid tank 13 is connected to the overflow outlet of the settling tank 12. The desorption tower 11 is used to extract dissolved acidic gases (such as SO2) from the liquid. The gas is then treated again by the primary packed tower 3 and subsequent purification equipment to meet the standards before being discharged. The liquid enters the settling tank 12 for settling. The supernatant after settling enters the dilute acid tank 13 for temporary storage, so that it can be introduced into the waste acid wastewater treatment system for further treatment.

[0035] Specifically, the waste acid treatment component also includes a filter press 14, which is connected between the settling inlet of the settling tank 12 and the inlet of the dilute acid tank 13. The filter press 14 achieves efficient solid-liquid separation, allowing the dust-laden liquid at the bottom of the settling tank 12 to pass through the filter press 14 for filtration, thus achieving solid-liquid separation. The separated liquid then enters the dilute acid tank 13.

[0036] This invention utilizes an internal circulating liquid to flush the electrostatic precipitator, reducing the use of production water and the amount of wastewater and acid generated, thus saving production costs. At the same time, the circulating supernatant discharged from the downstream equipment is used to replenish the upstream equipment, which not only helps to reduce the amount of production water used, but also avoids the direct discharge of water exceeding the upper limit of the liquid level in the sedimentation tank at the bottom of each piece of equipment, which would increase the treatment load, thereby effectively reducing production costs.

[0037] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0038] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An energy-saving type purifier for acid production, characterized by comprising: include: The system includes a scrubber, a packed tower, an electrostatic precipitator, an elevated water tank (1), and an electrostatic precipitator cleaning assembly. The scrubber, the packed tower, and the electrostatic precipitator are sequentially connected through an air duct to purify the flue gas in sequence. The elevated water tank (1) provides spray liquid to the scrubber and the packed tower. The drain outlets of the packed tower and the electrostatic precipitator are both connected to the liquid inlet of the scrubber through a liquid replenishment pipe. The electrostatic precipitator cleaning assembly includes a flushing pipe (15) and a nozzle (16) arranged corresponding to the cathode of the electrostatic precipitator. The water inlet of the flushing pipe (15) is connected to the drain outlet of the packing tower, the water inlet of the nozzle (16) is connected to the water inlet of the flushing pipe (15), and the water outlet is connected to the liquid replenishment port of the scrubber.

2. The energy-saving purification device for acid production according to claim 1, characterized in that, The packing tower includes a primary packing tower (3) and a secondary packing tower (5). The air inlet of the primary packing tower (3) is connected to the air outlet of the scrubber through an air duct, and its drain outlet is connected to the liquid inlet of the scrubber through a liquid replenishment pipe. The air inlet of the secondary packing tower (5) is connected to the air outlet of the primary packing tower (3), and its drain outlet is connected to the liquid inlet of the primary packing tower (3) through a liquid replenishment pipe. The air inlet of the electrostatic precipitator is connected to the air outlet of the secondary packing tower (5), and the water inlet of the flushing pipe (15) is connected to the drain outlet of the secondary packing tower (5).

3. The energy-saving purification device for acid production according to claim 2, characterized in that, It is also equipped with a packing tower circulation pump (8), and the drain outlets of the primary packing tower (3) and the secondary packing tower (5) are connected to their own liquid inlets through the packing tower circulation pump (8).

4. The energy-saving purification device for acid production according to claim 3, characterized in that, A heat exchanger (9) is installed between the inlet of the primary packing tower (3) and the secondary packing tower (5) and the corresponding packing tower circulating pump (8).

5. The energy saving type purifier for acid production according to claim 2, characterized in that, The scrubber includes a primary scrubber (2) and a secondary scrubber (4). The air outlet of the primary scrubber (2) is connected to the air inlet of the primary packed tower (3) through an air duct, and the drain outlet of the primary packed tower (3) is connected to the liquid inlet of the primary scrubber (2) through a liquid replenishment pipe. The air inlet of the secondary scrubber (4) is connected to the air outlet of the primary packed tower (3), and its drain outlet is connected to the liquid inlet of the primary packed tower (3) through a liquid replenishment pipe. The drain outlet of the secondary packed tower (5) is connected to the liquid inlet of the secondary scrubber (4) through a liquid replenishment pipe. The drain outlet of the electrostatic precipitator is connected to the liquid inlet of the primary scrubber (2) through a liquid replenishment pipe.

6. The energy-saving type purifier for acid production according to claim 5, characterized in that, It is also equipped with a washing machine circulation pump (10), and the drain outlets of the primary washing machine (2) and the secondary washing machine (4) are connected to their own liquid inlets through the washing machine circulation pump (10).

7. The energy-saving type purifier for acid production according to claim 5, characterized in that, The electrostatic precipitator includes a primary electrostatic precipitator (6) and a secondary electrostatic precipitator (7). The air inlet of the primary electrostatic precipitator (6) is connected to the air outlet of the secondary packed tower (5) through an air passage. The air inlet of the secondary electrostatic precipitator (7) is connected to the air outlet of the primary electrostatic precipitator (6) through an air passage. The drain outlets of the primary electrostatic precipitator (6) and the secondary electrostatic precipitator (7) are connected to the liquid replenishment port of the primary scrubber (2) through a liquid replenishment pipe.

8. The energy-saving purification device for acid production according to claim 7, characterized in that, The air outlet of the secondary electric mist eliminator (7) is provided with a water seal.

9. The energy saving type purifier for acid production according to claim 6, characterized in that, The dirty acid treatment assembly further comprises a filter press (14) connected between the sedimentation port of the sedimentation tank (12) and the water inlet of the dilute acid tank (13).

10. An energy-saving purification device for acid production according to claim 9, characterized in that, ​

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