A three-effect integrated system for treating zinc ash from hot galvanizing exhaust gas and recycling waste heat

Abstract

The application discloses a three-effect integrated system for recycling waste heat from zinc ash in hot galvanizing waste gas treatment, and solves the problem that waste heat cannot be recycled in the process of hot galvanizing waste gas treatment. The system comprises a fixing ring, a filter bag is arranged at the bottom end of the fixing ring, a fixing plate is fixedly arranged at the inner side of the fixing ring, a waste heat recycling assembly is fixedly arranged at the inner side of the fixing plate, an air outlet pipe is arranged at the top end of the fixing plate, a ball valve is arranged on the air outlet pipe, the waste heat recycling assembly comprises a middle pipe fixedly arranged at the inner side of the fixing plate, a bottom support assembly is arranged at the bottom end of the middle pipe, side pipes are equiangularly arranged at the outer side of the middle pipe, and the bottom support assembly comprises a limiting support disc fixedly arranged at the bottom end of the middle pipe. In the working process, the inner side of the fixing ring is provided with the middle pipe, water flows through the middle pipe and the side pipes at the inner side of the filter bag, heat exchange and heat collection with waste gas are realized, and waste heat recycling is facilitated.

Description

Technical Field

[0001] This invention belongs to the field of hot-dip galvanizing waste gas treatment technology, specifically a three-in-one system for hot-dip galvanizing waste gas treatment, zinc ash recovery, and waste heat utilization. Background Technology

[0002] Hot-dip galvanizing, also known as hot-dip zinc plating, is a surface treatment method that involves immersing metal products in molten zinc to form a dense zinc layer on their surface. The process principle is as follows: When a metal workpiece is immersed in molten zinc, a solid solution layer of zinc and α-Fe first forms at the interface. As the reaction proceeds, after zinc reaches its solubility limit in the solid solution, iron and zinc atoms diffuse into each other. Zinc atoms that enter the iron matrix form an alloy phase, while iron atoms that diffuse into the molten zinc form the intermetallic compound FeZn. 13 The zinc dross settles to the bottom of the molten zinc, forming zinc dross. When the workpiece leaves the molten zinc, a hexagonal pure zinc layer forms on its surface, with its iron content strictly controlled below 0.003%. A high-strength bond between the iron substrate and the zinc coating is achieved through an alloying reaction. However, the hot-dip galvanizing process generates a large amount of waste gas, primarily composed of zinc ash. Therefore, filtration equipment is typically used to filter and recover the zinc ash from the waste gas. However, this process has the following drawbacks:

[0003] Because the exhaust gas contains a large amount of heat, it is directly filtered and discharged during exhaust gas treatment, which makes it impossible to recover and utilize the residual heat in the exhaust gas, resulting in a waste of resources. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, this invention provides a three-in-one system for hot-dip galvanizing waste gas treatment, zinc ash recovery, and waste heat utilization, which effectively solves the problem that the waste heat in the waste gas cannot be recovered and utilized.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a three-in-one system for hot-dip galvanizing waste gas treatment, zinc ash recovery, and waste heat utilization, comprising a fixed ring, a filter bag installed at the bottom end of the fixed ring, a fixed plate fixedly installed on the inner side of the fixed ring, a waste heat recovery component fixedly installed on the inner side of the fixed plate, an exhaust pipe installed at the top end of the fixed plate, and a ball valve installed on the exhaust pipe.

[0006] The waste heat recovery assembly includes a central tube fixedly installed inside the fixed plate, a bottom support assembly installed at the bottom end of the central tube, and side tubes installed at equal angles on the outer side of the central tube.

[0007] The bottom support assembly includes a limiting support plate fixedly installed at the bottom end of the central tube. The limiting support plate has a central groove in the middle, which is connected to the bottom end of the central tube. The limiting support plate has side grooves at equal angles, which correspond one-to-one with the side tubes and are connected to the bottom ends of the corresponding side tubes. The limiting support plate has connecting grooves at equal angles inside, and the two ends of the connecting grooves are connected to the central groove and the side grooves, respectively.

[0008] Preferably, the outer wall of the limiting support plate is in close contact with the inner wall of the filter bag, and the limiting support plate plays a limiting support role for the fixing plate.

[0009] Preferably, a distribution ring pipe is sleeved on the outer side of the central pipe, and a connecting pipe is installed at an equal angle on the inner side of the distribution ring pipe. The connecting pipe corresponds one-to-one with the side pipe, and the two ends of the connecting pipe are connected to the side pipe and the distribution ring pipe, respectively.

[0010] Preferably, an inlet pipe is fixedly installed on one side of the distribution ring pipe, and an outlet water tank is connected to the inlet pipe. An outlet pipe is fixedly installed on the middle pipe, and a hot water storage tank is connected to the outlet pipe.

[0011] Preferably, the limiting support plate has longitudinal grooves at equal angles inside, the longitudinal grooves correspond one-to-one with the side grooves, and the longitudinal grooves are located on the side of the side grooves away from the central groove. A first transverse groove is formed between the longitudinal grooves and the side grooves, and a backflushing cleaning component is provided inside the longitudinal grooves.

[0012] Preferably, the backflushing cleaning component includes a longitudinal stop block movably installed inside the longitudinal groove. The upper and lower ends of the longitudinal groove extend to the upper and lower sides of the limiting support plate, respectively. The top wall of the longitudinal stop block is flush with the top wall of the limiting support plate. A pressure plate is fixedly installed at the bottom end of the longitudinal stop block, and the pressure plate is located below the limiting support plate.

[0013] Preferably, a sliding groove is provided on the side of the longitudinal groove away from the first transverse groove, a sliding plate is fixedly installed on one side of the longitudinal stop, the sliding plate is slidably connected to the sliding groove, a spring is fixedly installed at the bottom of the sliding plate, the bottom of the spring is fixedly connected to the inner bottom wall of the sliding groove, a magnetic block is fixedly installed on the sliding plate, and an electromagnet is fixedly installed on the inner top wall of the sliding groove.

[0014] Preferably, the connecting groove is U-shaped, and a second transverse groove is formed on the side of the transverse portion of the connecting groove near the longitudinal groove. A movable groove is formed at the end of the second transverse groove near the longitudinal groove, and the movable groove is connected to the longitudinal groove.

[0015] Preferably, a stop bar is movably installed inside the second transverse groove. The outer wall of the stop bar is in close contact with the inner wall of the second transverse groove. The diameter of the second transverse groove is the same as the diameter of the connecting groove. One end of the stop bar is located inside the movable groove. A connecting rod is hinged to one end of the movable groove. The other end of the connecting rod is hinged to the side wall of the longitudinal stop block. The end of the longitudinal stop block near the stop bar is inclined downward.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1) During operation, a central tube is set inside the fixed ring. The limiting support plate at the bottom of the central tube provides limiting support for the bottom of the filter bag, ensuring that the filter bag filters zinc ash and facilitates the treatment of waste gas. At the same time, water flows through the central and side tubes inside the filter bag, which can exchange heat with the waste gas and collect heat, facilitating the recovery and utilization of waste heat.

[0018] 2) During operation, when the set electromagnet is energized to drive the longitudinal stop block to move downward, it can move the longitudinal stop block to the bottom of the first transverse groove and push the stop rod into the connecting groove to seal the middle tube, so that outside air can enter the filter bag through the longitudinal groove to backwash and clean the filter bag, which is convenient to use.

[0019] 3) During operation, a pressure plate is fixedly installed at the bottom of the longitudinal block. As the longitudinal block moves downward, the pressure plate moves downward, which generates pressure on the bottom of the filter bag and stretches the filter bag, thereby increasing the pore size on the filter bag, facilitating the separation of zinc ash from the filter bag, and making it easier to clean the filter bag. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0021] In the attached diagram:

[0022] Figure 1 This is a schematic diagram of a three-in-one system for treating hot-dip galvanizing exhaust gas, recovering zinc ash, and utilizing waste heat, according to the present invention.

[0023] Figure 2 This is a schematic diagram of the filter bag structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the waste heat recovery component structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the connection structure between the central tube and the limiting support plate of the present invention;

[0026] Figure 5This is a schematic diagram of the backflushing cleaning component structure of the present invention;

[0027] Figure 6 This is a schematic diagram of the pressure plate structure of the present invention.

[0028] In the diagram: 1. Fixing ring; 2. Filter bag; 3. Fixing plate; 4. Air outlet pipe; 5. Waste heat recovery assembly; 501. Central pipe; 502. Side pipe; 503. Water outlet pipe; 504. Distribution ring pipe; 505. Connecting pipe; 506. Water inlet pipe; 6. Bottom support assembly; 601. Limiting support plate; 602. Central groove; 603. Side groove; 604. Connecting groove; 605. Longitudinal groove; 606. First transverse groove; 607. Backflushing cleaning component; 6071. Longitudinal stop block; 6072. Pressure plate; 6073. Slide groove; 6074. Slide plate; 6075. Spring; 6076. Magnetic block; 6077. Electromagnet; 6078. Second transverse groove; 6079. Movable groove; 60710. Stop bar; 60711. Connecting rod. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] Depend on Figure 1-6 The present invention relates to a three-in-one system for treating hot-dip galvanizing exhaust gas, recovering zinc ash, and utilizing waste heat, comprising a fixing ring 1, a filter bag 2 installed at the bottom end of the fixing ring 1, a fixing plate 3 fixedly installed on the inner side of the fixing ring 1, a waste heat recovery component 5 fixedly installed on the inner side of the fixing plate 3, an exhaust pipe 4 installed at the top end of the fixing plate 3, and a ball valve installed on the exhaust pipe 4.

[0031] The waste heat recovery assembly 5 includes a central pipe 501 fixedly installed inside the fixed plate 3. A bottom support assembly 6 is installed at the bottom end of the central pipe 501. Side pipes 502 are installed at equal angles on the outer side of the central pipe 501. A distribution ring pipe 504 is sleeved on the outer side of the central pipe 501. A connecting pipe 505 is installed at equal angles on the inner side of the distribution ring pipe 504. The connecting pipe 505 corresponds one-to-one with the side pipes 502. The two ends of the connecting pipe 505 are connected to the side pipes 502 and the distribution ring pipe 504, respectively. A water inlet pipe 506 is fixedly installed on one side of the distribution ring pipe 504. The inlet pipe 506 is connected to and installed with an outlet water tank. The outlet pipe 503 is fixedly installed on the middle pipe 501. The outlet pipe 503 is connected to and installed with a hot water storage tank. The middle pipe 501 is set inside the fixing ring 1. The limiting support plate 601 at the bottom of the middle pipe 501 plays a limiting support role for the bottom of the filter bag 2, ensuring that the filter bag 2 filters zinc ash and facilitates the treatment of exhaust gas. At the same time, the water flows through the middle pipe 501 and the side pipe 502 inside the filter bag 2, which can exchange heat with the exhaust gas and collect heat, facilitating the recovery and utilization of waste heat.

[0032] The bottom support assembly 6 includes a limiting support plate 601 fixedly installed at the bottom end of the central tube 501. A central groove 602 is formed in the center of the limiting support plate 601, communicating with the bottom end of the central tube 501. Side grooves 603 are formed at equal angles on the limiting support plate 601, each corresponding to a side tube 502, and communicating with the bottom end of the corresponding side tube 502. A connecting groove 604 is formed at equal angles inside the limiting support plate 601, with both ends of the connecting groove 604 respectively communicating with the central groove 601. 02 and the side groove 603 are connected. The outer wall of the limiting support plate 601 is in close contact with the inner wall of the filter bag 2. The limiting support plate 601 plays a limiting support role for the fixing plate 3. The limiting support plate 601 has a longitudinal groove 605 at equal angles inside. The longitudinal groove 605 corresponds to the side groove 603 one by one. The longitudinal groove 605 is located on the side of the side groove 603 away from the middle groove 602. A first transverse groove 606 is opened between the longitudinal groove 605 and the side groove 603. A backwash cleaning component 607 is provided inside the longitudinal groove 605.

[0033] The backwash cleaning component 607 includes a longitudinal stop 6071 movably installed inside a longitudinal groove 605. The upper and lower ends of the longitudinal groove 605 extend to the upper and lower sides of a limiting support plate 601, respectively. The top wall of the longitudinal stop 6071 is flush with the top wall of the limiting support plate 601. A pressure plate 6072 is fixedly installed at the bottom end of the longitudinal stop 6071, located below the limiting support plate 601. As the longitudinal stop 6071 moves downward, the pressure plate 6072 moves downward, generating pressure on the bottom end of the filter bag 2, thus affecting the filter... The filter bag 2 is stretched to increase the pore size, facilitating the separation of zinc ash from the filter bag 2 and making it easier to clean. A sliding groove 6073 is provided on the side of the longitudinal groove 605 away from the first transverse groove 606. A sliding plate 6074 is fixedly installed on one side of the longitudinal stop 6071, and the sliding plate 6074 is slidably connected to the sliding groove 6073. A spring 6075 is fixedly installed at the bottom of the sliding plate 6074, and the bottom of the spring 6075 is fixedly connected to the inner bottom wall of the sliding groove 6073. A magnet 6076 is fixedly installed on the sliding plate 6074, and an electric magnet 6076 is fixedly installed on the inner top wall of the sliding groove 6073. Magnet 6077, connecting groove 604 is U-shaped, the transverse portion of connecting groove 604 near the longitudinal groove 605 has a second transverse groove 6078, the end of the second transverse groove 6078 near the longitudinal groove 605 has a movable groove 6079, the movable groove 6079 is connected to the longitudinal groove 605, a stop rod 60710 is movably installed inside the second transverse groove 6078, the outer wall of the stop rod 60710 is in close contact with the inner wall of the second transverse groove 6078, the diameter of the second transverse groove 6078 is the same as the diameter of the connecting groove 604, one end of the stop rod 60710 is located inside the movable groove 6079. One end of the movable groove 6079 is hinged to a connecting rod 60711, and the other end of the connecting rod 60711 is hinged to the side wall of the longitudinal stop 6071. The end of the longitudinal stop 6071 near the stop rod 60710 is inclined downward. When the electromagnet 6077 is energized to drive the longitudinal stop 6071 to move downward, it can move the longitudinal stop 6071 to below the first transverse groove 606 and push the stop rod 60710 into the connecting groove 604, sealing the middle tube 501, so that outside air can enter the filter bag 2 through the longitudinal groove 605 to backwash and clean the filter bag 2, which is convenient to use.

[0034] Working principle: During operation, the equipment is first installed in the exhaust gas treatment tower, and the air inlet pipe of the exhaust gas treatment tower is connected to the hot-dip galvanizing exhaust gas source. The air inlet pipe of a typical exhaust gas treatment tower is equipped with an air inlet valve. During operation, the air inlet valve on the air inlet pipe and the ball valve on the air outlet pipe 4 are opened, and then the exhaust gas enters the exhaust gas treatment tower through the air inlet pipe. At this time, the exhaust gas can only enter the inner side of the filter bag 2 through the pores on the filter bag 2, and then exit from the air outlet pipe 4. When passing through the filter bag 2, the pores on the filter bag 2 play a filtering role on the exhaust gas, so that the zinc ash in the exhaust gas is retained on the filter bag 2.

[0035] Meanwhile, the pump in the outlet water tank is turned on, driving the water in the outlet water tank to enter the side pipes 502 through the inlet pipe 506, the distribution ring pipe 504 and each connecting pipe 505, and then enter the central pipe 501 through the connecting groove 604, and finally be discharged into the hot water storage tank through the outlet pipe 503. During the water flow process, the heat in the exhaust gas exchanges heat with the water flow, heating the water, thereby recovering energy from the exhaust gas and saving energy.

[0036] When the amount of zinc ash adhering to the filter bag 2 is too large, causing poor filtration, close the air inlet valve and ball valve, disconnect the water inlet pipe 506 from the water outlet tank, and connect the water inlet pipe 506 to the air pump. Then, control the electromagnet 6077 to be energized, so that the electromagnet 6077 generates a repulsive force on the magnetic block 6076, pushing the longitudinal stop 6071 to move downward. The longitudinal stop 6071 moves downward to below the first transverse groove 606. During the movement, the pressure plate 6072 moves downward to stretch the filter bag 2, expand the pore size on the filter bag 2, and facilitate dust removal.

[0037] At the same time, the longitudinal stop 6071 moves downward, and the connecting rod 60711 pushes the stop rod 60710 to move towards the inside of the connecting groove 604, thereby sealing the connecting groove 604 and preventing air from entering the middle pipe 501 during ventilation. Then, the air pump is turned on, and the outside air is driven into the side pipe 502 and sprayed into the filter bag 2 through the first transverse groove 606 and the longitudinal groove 605, which has a backwashing effect on the filter bag 2 and cleans the filter bag 2.

[0038] The waste gas recovery tower is equipped with a spray system. After the zinc ash on the filter bag 2 is sprayed out, the spray system is turned on to settle the zinc ash, making it easy to collect.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A three-in-one system for hot-dip galvanizing waste gas treatment, zinc ash recovery, and waste heat utilization, comprising a fixing ring (1), characterized in that: A filter bag (2) is installed at the bottom end of the fixed ring (1), a fixed plate (3) is fixedly installed on the inner side of the fixed ring (1), a waste heat recovery component (5) is fixedly installed on the inner side of the fixed plate (3), an air outlet pipe (4) is installed at the top end of the fixed plate (3), and a ball valve is installed on the air outlet pipe (4). The waste heat recovery assembly (5) includes a central tube (501) fixedly installed inside the fixed plate (3), a bottom support assembly (6) installed at the bottom end of the central tube (501), and a side tube (502) installed at equal angles on the outside of the central tube (501). The bottom support assembly (6) includes a limiting support plate (601) fixedly installed at the bottom end of the middle tube (501). The limiting support plate (601) has a middle groove (602) in the middle, which is connected to the bottom end of the middle tube (501). The limiting support plate (601) has side grooves (603) at equal angles. The side grooves (603) correspond one-to-one with the side tubes (502), and the side grooves (603) are connected to the bottom end of the corresponding side tubes (502). The limiting support plate (601) has a connecting groove (604) at equal angles inside, and the two ends of the connecting groove (604) are connected to the middle groove (602) and the side groove (603) respectively. The limiting support plate (601) has longitudinal grooves (605) at equal angles inside. The longitudinal grooves (605) correspond one-to-one with the side grooves (603). The longitudinal grooves (605) are located on the side of the side grooves (603) away from the central groove (602). A first transverse groove (606) is provided between the longitudinal grooves (605) and the side grooves (603). A backflushing cleaning component (607) is provided inside the longitudinal grooves (605).

2. The integrated system for hot-dip galvanizing waste gas treatment, zinc ash recovery, and waste heat utilization according to claim 1, characterized in that: The outer wall of the limiting support plate (601) is in close contact with the inner wall of the filter bag (2), and the limiting support plate (601) plays a limiting support role for the fixing plate (3).

3. The integrated system for hot-dip galvanizing waste gas treatment, zinc ash recovery, and waste heat utilization according to claim 1, characterized in that: The middle tube (501) is fitted with a distribution ring tube (504) on its outer side. A connecting tube (505) is installed at an equal angle on the inner side of the distribution ring tube (504). The connecting tube (505) corresponds one-to-one with the side tube (502). The two ends of the connecting tube (505) are connected to the side tube (502) and the distribution ring tube (504) respectively.

4. The integrated system for hot-dip galvanizing waste gas treatment, zinc ash recovery, and waste heat utilization according to claim 3, characterized in that: A water inlet pipe (506) is fixedly installed on one side of the distribution ring pipe (504), and a water outlet tank is connected to the water inlet pipe (506). A water outlet pipe (503) is fixedly installed on the middle pipe (501), and a hot water storage tank is connected to the water outlet pipe (503).

5. The integrated system for hot-dip galvanizing waste gas treatment, zinc ash recovery, and waste heat utilization according to claim 1, characterized in that: The backwash cleaning component (607) includes a longitudinal stop (6071) movably installed inside the longitudinal groove (605). The upper and lower ends of the longitudinal groove (605) extend to the upper and lower sides of the limiting support plate (601), respectively. The top wall of the longitudinal stop (6071) is flush with the top wall of the limiting support plate (601). A pressure plate (6072) is fixedly installed at the bottom end of the longitudinal stop (6071). The pressure plate (6072) is located below the limiting support plate (601).

6. The integrated system for hot-dip galvanizing waste gas treatment, zinc ash recovery, and waste heat utilization according to claim 1, characterized in that: A sliding groove (6073) is provided on the side of the longitudinal groove (605) away from the first transverse groove (606). A sliding plate (6074) is fixedly installed on one side of the longitudinal stop (6071). The sliding plate (6074) is slidably connected to the sliding groove (6073). A spring (6075) is fixedly installed at the bottom end of the sliding plate (6074). The bottom end of the spring (6075) is fixedly connected to the inner bottom wall of the sliding groove (6073). A magnet (6076) is fixedly installed on the sliding plate (6074). An electromagnet (6077) is fixedly installed on the inner top wall of the sliding groove (6073).

7. The integrated system for hot-dip galvanizing waste gas treatment, zinc ash recovery, and waste heat utilization according to claim 1, characterized in that: The connecting groove (604) is U-shaped. A second transverse groove (6078) is provided on the side of the transverse portion of the connecting groove (604) near the longitudinal groove (605). A movable groove (6079) is provided at the end of the second transverse groove (6078) near the longitudinal groove (605). The movable groove (6079) is connected to the longitudinal groove (605).

8. The integrated system for hot-dip galvanizing waste gas treatment, zinc ash recovery, and waste heat utilization according to claim 7, characterized in that: A stop bar (60710) is movably installed inside the second transverse groove (6078). The outer wall of the stop bar (60710) is in close contact with the inner wall of the second transverse groove (6078). The diameter of the second transverse groove (6078) is the same as the diameter of the connecting groove (604). One end of the stop bar (60710) is located inside the movable groove (6079). A connecting rod (60711) is hinged to one end of the movable groove (6079). The other end of the connecting rod (60711) is hinged to the side wall of the longitudinal stop block (6071). The end of the longitudinal stop block (6071) near the stop bar (60710) is inclined downward.

Images