Dust and steam prevention device for head of zinc oxide volatilization kiln

Abstract

This invention discloses a dust and steam prevention device for the kiln head of a zinc oxide volatilization kiln. The device includes a kiln head hood, a kiln body connected to one side of the hood, and a discharge port at its bottom. A feed pipe is connected to the discharge port, and a chute is connected to the lower end of the feed pipe. A dust collection chamber is connected to the lower end of the chute, and a slag pool is connected to the lower end of the dust collection chamber. An exhaust stack is connected to the upper end of the dust collection chamber. A vertical first water vapor baffle is rotatably connected to the inner side of the feed pipe at the inlet of the chute. A vertical second water vapor baffle is rotatably connected to the inner side of the dust collection chamber at the outlet of the chute. This invention provides a first and a second water vapor baffle at the inlet and outlet of the chute, preventing water vapor from falling into the slag pool from being drawn into the kiln head hood and entering the baghouse dust collector along with the flue gas. This separates the water vapor from the flue gas, preventing water vapor from being drawn into the baghouse dust collector and causing caking, thus improving the dust removal efficiency of the baghouse dust collector.

Description

Technical Field

[0001] This invention relates to the field of volatilization kiln equipment technology, and in particular to a dust and steam prevention device for the kiln head of a zinc oxide volatilization kiln. Background Technology

[0002] A volatile matter kiln, also known as a rotary calcining kiln, is a type of building materials equipment and one of the main pieces of equipment in zinc oxide production. The material outlet of the volatile matter kiln is located at the kiln head end, which is equipped with a kiln head hood. The hood has a feeding port, and the slag after calcination is discharged through the feeding port and transported via a chute to a slag pool for cooling. The flue gas generated during calcination is drawn into a baghouse dust collector for dust removal and then purified through a desulfurization tower before being discharged.

[0003] Patent application number CN201720536455.4 discloses a settling tank connected to the kiln head of a volatilization kiln, including a settling tank and a slag tank provided on the settling tank. The slag tank has a slag discharge port on its upper part and protective members are provided on both sides of the slag tank. A collection hood is provided directly above the slag tank and between the two protective members. The collection hood is in the shape of an inverted funnel and has a vertically arranged exhaust pipe above it.

[0004] When using this sedimentation tank for slag cooling, the slag is discharged from the material outlet of the volatilization kiln and enters the slag tank through a chute connected to the slag outlet. The slag is then cooled by the cooling water in the slag tank. Due to the high temperature of the slag, a large amount of water vapor is generated when the slag falls into the slag pool. This water vapor is then drawn back into the kiln hood via the chute and enters the bag filter. This results in both water vapor and flue gas being drawn into the bag filter simultaneously. The water vapor causes the bag filter to stick together, affecting its dust removal efficiency. When the bag filter becomes caked, it creates a positive pressure inside the kiln hood, allowing a small amount of flue gas to escape through the gap between the kiln hood and the kiln body, causing environmental pollution. Furthermore, when the slag is cooled in this sedimentation tank, there may be a height difference between the slag discharge point and the water surface in the slag pool. When the slag falls from the discharge point onto the water surface, it generates a large amount of water vapor, leading to high pressure within the sedimentation tank and increasing the likelihood of dust generation. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a dust and steam prevention device for the kiln head of a zinc oxide volatilization kiln with a simple structure. This device can reduce the amount of water vapor entering the bag filter, improve the dust removal effect, and avoid dust generation.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a dust and steam prevention device for the kiln head of a zinc oxide volatilization kiln, including a kiln head cover, a kiln body connected to one side of the kiln head cover, and a discharge port provided at the bottom of the kiln head cover. The discharge port is connected to a feeding pipe, the lower end of the feeding pipe is connected to a chute, the lower end of the chute is connected to a dust collection chamber, the lower end of the dust collection chamber is connected to a slag pool, and the upper end of the dust collection chamber is connected to an exhaust pipe. A vertical first water vapor baffle is rotatably connected to the inner side of the feeding pipe. The first water vapor baffle is located at the inlet of the chute. A vertical second water vapor baffle is rotatably connected to the inner side of the dust collection chamber. The second water vapor baffle is located at the outlet of the chute.

[0007] Furthermore, the lower end of the dust collection chamber extends below the horizontal plane inside the slag pool.

[0008] Furthermore, the dust collection chamber and / or exhaust stack are connected to a high-pressure spray device. The high-pressure spray device includes a liquid storage tank and a main pipe connected to the liquid storage tank. At least one spray pipe is connected to one end of the main pipe. The end of the spray pipe away from the main pipe extends into the dust collection chamber or exhaust stack. The spray pipe is equipped with multiple nozzles.

[0009] Furthermore, the number of spray pipes is three, with one spray pipe extending into the dust collection chamber at the end furthest from the main pipe, and the other two spray pipes extending into the exhaust pipe at the ends furthest from the main pipe.

[0010] Furthermore, a water pump is installed in the storage tank, and the water pump is connected to the main pipe.

[0011] Furthermore, a sealing device is provided at the connection between the kiln head hood and the kiln body.

[0012] Furthermore, the sealing device includes a sealing support disposed on the kiln body, at least one static sealing ring, and a sealing plate. The top of the sealing support is connected to a sealing bracket, and at least one dynamic sealing ring is provided on the inner wall of the support near the hood. The static sealing ring is connected to the side of the kiln head hood near the kiln body, and it and the dynamic sealing ring are interlocked to form a sealed labyrinth structure. The sealing plate includes a transverse pressing plate and a longitudinal pressing plate integrally formed with the transverse pressing plate. One end of the transverse pressing plate is connected to the kiln head hood, and the bottom end of the longitudinal pressing plate is connected to the sealing bracket.

[0013] Furthermore, a fastening device is provided between the sealing bracket and the longitudinal pressure plate.

[0014] Furthermore, the fastening device includes a screw and a connecting plate. The bottom end of the connecting plate is connected to the sealing bracket and has a through hole. The longitudinal pressure plate has a screw hole. One end of the screw passes through the through hole and is threadedly connected to the screw hole, and the other end is connected to a nut.

[0015] Furthermore, a spring and a washer are fitted onto the screw, with one end of the spring connected to the connecting plate and the other end connected to the washer.

[0016] The beneficial effects of the dust and steam prevention device for the kiln head of a zinc oxide volatilization kiln of the present invention are as follows:

[0017] (1) By providing a first water vapor barrier and a second water vapor barrier at the inlet and outlet of the chute respectively, the present invention can prevent water vapor after the slag falls into the slag pool from being sucked into the kiln head hood and entering the bag filter along with the flue gas, thereby separating the water vapor and the flue gas, avoiding the phenomenon of water vapor being sucked into the bag filter and causing the bag filter to clump, and improving the dust removal effect of the bag filter.

[0018] (2) The present invention provides a dust collection chamber connected to the chute and the slag pool, and extends the lower end of the dust collection chamber into the slag pool below the horizontal plane to form a water seal, thereby expanding the water seal area, reducing the pressure caused by water vapor generated when the slag falls into the slag pool, reducing the risk of dust in the slag, and thus reducing the pollution of dust to the environment and the health of workers.

[0019] (3) By providing a static sealing ring and a dynamic sealing ring, the present invention forms a labyrinth-like sealing structure between the static sealing ring and the dynamic sealing ring, which reduces the speed of airflow escape, improves the sealing effect, avoids the leakage of materials and flue gas, improves the material recovery rate, and reduces the environmental pollution caused by flue gas leakage. Attached Figure Description

[0020] Figure 1 —A schematic diagram of the structure of a dust and steam prevention device for the kiln head of a zinc oxide volatilization kiln according to the present invention;

[0021] Figure 2 —A schematic diagram of the rotatable connection of the first water vapor baffle;

[0022] Figure 3 —This is a schematic diagram of the sealing device.

[0023] The above-mentioned reference numerals are as follows: 1-Kiln head cover, 2-Kiln body, 3-Feeding pipe, 4-Chutter, 5-Dust collection chamber, 6-Slag pool, 7-Exhaust pipe, 8-First steam damper, 9-Second steam damper, 10-Connecting ring, 11-Rotating shaft, 12-Connecting piece, 13-Storage tank, 14-Main pipe, 15-First spray pipe, 16-Second spray pipe, 17-Third spray pipe, 18-First nozzle, 19-Second nozzle, 20-Third nozzle, 21-Exhaust port, 22-Air duct hole, 23-Observation hole, 24-Sealing device, 25-Sealing support, 26-Static sealing ring, 27-Sealing plate, 28-Transverse pressure plate, 29-Longitudinal pressure plate, 30-Dynamic sealing ring, 31-Sealing bracket, 32-Reinforcing rib plate, 33-Screw, 34-Connecting plate, 35-Nut, 36-Spring, 37-Gasket. The arrows in the diagram indicate the direction of gas flow. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments, but these specific embodiments do not limit the scope of protection of the present invention in any way.

[0025] Example 1

[0026] A dust and steam prevention device for the kiln head of a zinc oxide volatilization kiln includes a kiln head cover 1. A kiln body 2 is connected to one side of the kiln head cover 1, and a discharge port is provided at its bottom. The discharge port is connected to a feed pipe 3. The lower end of the feed pipe 3 is connected to a chute 4. The lower end of the chute 4 is connected to a dust collection chamber 5. The lower end of the dust collection chamber 5 is connected to a slag pool 6, and the upper end of the dust collection chamber 5 is connected to an exhaust pipe 7. A vertical first water vapor baffle 8 is rotatably connected to the inner side of the feed pipe 3. The first water vapor baffle 8 is located at the inlet of the chute 4. A vertical second water vapor baffle 9 is rotatably connected to the inner side of the dust collection chamber 5. The second water vapor baffle 9 is located at the outlet of the chute 4.

[0027] The first water vapor barrier 8 is rotatably connected as follows: a pair of connecting rings 10 are respectively provided on the inner walls of the dust collection chamber 5 and the discharge pipe 3. A rotating shaft 11 is inserted through the through hole of the connecting ring 10. A connecting piece 12 is connected to the middle of the rotating shaft 11. The lower end of the connecting piece 12 is connected to the first water vapor barrier 8 and the second water vapor barrier 9. The second water vapor barrier 9 is rotatably connected in the same way as the first water vapor barrier 8, and other rotatable connection structures in the prior art can also be used for the rotatable connection.

[0028] The slag material conveyed from the kiln body 2 to the kiln head hood 1 passes through the discharge port, feed pipe 3, chute 4, and dust collection chamber 5 into the slag pool 6. Since the slag material is a high-temperature material, a large amount of water vapor will be generated when it comes into contact with the water in the slag pool 6. This invention provides a first water vapor baffle 8 and a second water vapor baffle 9 at the inlet and outlet of the chute 4. When slag is transported to the chute 4, the slag itself pushes open the first water vapor baffle 8 and the second water vapor baffle 9, causing it to fall from the chute 4 into the slag pool 6. After the slag falls into the slag pool 6, the first water vapor baffle 8 and the second water vapor baffle 9 return to their initial positions (i.e., vertical state) under their own gravity, thereby sealing the inlet and outlet of the chute 4. The blocking effect of the first water vapor baffle 8 and the second water vapor baffle 9 prevents the water vapor generated when the slag falls from the chute 4 into the slag pool 6 from being drawn back into the bag filter, causing the bag filter to clump. This improves the dust removal efficiency of the bag filter, prevents the positive pressure phenomenon caused by the clumping of the bag filter inside the kiln head hood 1, and reduces the risk of flue gas leaking out from the gaps between the kiln head hood 1 and the kiln body 2, thereby reducing the environmental pollution caused by the direct leakage of untreated flue gas.

[0029] The lower end of the dust collection chamber 5 extends below the horizontal plane inside the slag pool 6.

[0030] This invention, by providing a dust collection chamber 5 between the exhaust stack 7 and the slag pool 6, and connecting the chute 4 to the dust collection chamber 5, avoids the phenomenon of water being back-drawn into the chute 4 when the chute 4 is directly connected to the slag pool 6, thus ensuring the dust removal effect of the bag filter in the volatilization kiln. The lower end of the dust collection chamber 5 extends below the water level in the slag pool 6, forming a water seal between the bottom of the dust collection chamber 5 and the water surface in the slag pool 6. This increases the water seal area, reduces the pressure of water vapor generated when slag falls into the slag pool 6, promotes the settling of dust in the slag, improves the dust settling effect, and reduces the risk of dust being emitted from the slag, thereby reducing dust pollution to the environment and the health of workers.

[0031] The dust collection chamber 5 and the exhaust pipe 7 are connected to a high-pressure spray device. The high-pressure spray device includes a liquid storage tank 13 and a main pipe 14 connected to the liquid storage tank 13. There are three spray pipes, specifically a first spray pipe 15, a second spray pipe 16, and a third spray pipe 17. The first spray pipe 15 is equipped with three first nozzles 18 on the pipe inside the dust collection chamber 5. The left end of the second spray pipe 16 extends into the exhaust pipe 7. The second spray pipe 16 is equipped with three second nozzles 19 on the pipe inside the exhaust pipe 7. The left end of the third spray pipe 17 extends into the exhaust pipe 7. The third spray pipe 17 is equipped with three third nozzles 20 on the pipe inside the exhaust pipe 7.

[0032] The liquid storage tank 13 is equipped with a water pump, which is connected to the main pipe 14.

[0033] The high-pressure spraying device can spray the dust in the dust collection chamber 5 and the exhaust pipe 7 under high pressure, so that the dust settles and falls into the slag pool 6, avoiding the dust from escaping directly from the exhaust pipe 7 and causing environmental pollution, and further improving the dust suppression effect.

[0034] A sealing device 24 is provided at the connection between the kiln head hood 1 and the kiln body 2. The top of the kiln head hood 1 is conical, and an exhaust port 21 is provided at the top. The conical shape of the top of the kiln head hood 1 allows the dust transmitted from the kiln body 2 into the kiln head hood 1 to be collected and then sucked into the bag filter through the exhaust port 21, thereby improving the efficiency of the bag filter. The side of the kiln head hood 1 away from the kiln body 2 is provided with a duct hole 22, the front of the kiln head hood 1 is provided with an observation hole 23, and the inner side of the kiln head hood 1 is lined with refractory material.

[0035] The sealing device 24 includes a sealing support 25 disposed on the outer wall of the kiln body 2, at least one static sealing ring 26 (two in this embodiment) and a sealing pressure plate 27. The top of the sealing support 25 is connected to a sealing bracket 31, which is located between the sealing support 25 and the kiln head cover 1, and a gap is left between its left end and the kiln head cover 1. At least one dynamic sealing ring 30 (one in this embodiment) is provided on the inner wall of the sealing support 25 near the kiln head cover 1. The static sealing ring 26 is connected to the side of the kiln head cover 1 near the kiln body 2, and it and the dynamic sealing ring 30 are interlocked to form a sealed labyrinth structure. The sealing pressure plate 27 includes a transverse pressure plate 28 and a longitudinal pressure plate 29 integrally formed with the transverse pressure plate 28. One end of the transverse pressure plate 28 is connected to the right side wall of the kiln head cover 1, and the bottom end of the longitudinal pressure plate 29 is connected to the sealing bracket 31.

[0036] The arrangement of the static sealing ring 26, the dynamic sealing ring 30, and the sealing plate 27 allows the flue gas escaping from between the kiln body 2 and the kiln head hood 1 to pass through the sealed labyrinth structure formed by the static sealing ring 26 and the dynamic sealing ring 30 from bottom to top. The static sealing ring 26 and the dynamic sealing ring 30 not only change the direction of the airflow but also block the airflow, reducing the kinetic energy of the airflow and the dust carried by the airflow, thereby reducing the airflow velocity and the amount of dust carried by the airflow and improving the sealing effect.

[0037] To further improve the sealing effect, a fastening device is provided between the sealing bracket 31 and the longitudinal pressure plate 29. The fastening device includes a screw 33 and a connecting plate 34. The bottom end of the connecting plate 34 is connected to the sealing bracket 31 and has a through hole. The longitudinal pressure plate 29 has a threaded hole. One end of the screw 33 passes through the through hole and is threaded into the threaded hole, and the other end is connected to a nut 35. The screw 33 is fastened to the connecting plate 34 by the nut 35. The screw 33 and the connecting plate 34 tightly connect the kiln head cover 1 and the seal, preventing gaps between the sealing pressure plate 27 and the kiln head cover 1 from causing most of the airflow to escape, thus further improving the sealing performance of the kiln head cover 1.

[0038] A spring 36 and a washer 37 are fitted onto the screw 33. One end of the spring 36 is connected to the connecting plate 34, and the other end is connected to the washer 37. The spring 36 increases the pressure and friction between the screw 33 and the longitudinal pressure plate 29, preventing the screw 33 from loosening and falling off, which would reduce the sealing effect and ensure the sealing effect of the sealing device 24.

[0039] When airflow leaks out between the sealing plate 27 and the kiln head cover 1, the airflow has pressure, which causes the longitudinal plate 29 to have pressure in the direction of the screw 33. The screw 33 provides a counterforce in the direction of the sealing plate 27 towards the kiln head cover 1, thereby pressing the sealing plate 27 against the kiln head cover 1. In addition, when the airflow applies pressure to the longitudinal plate 29, the spring 36 is compressed. At this time, the spring 36 generates a restoring force in the direction of the kiln head cover 1, which further presses the sealing plate 27 tightly against the kiln head cover 1, further improving the sealing effect.

[0040] A reinforcing rib 32 is provided between the kiln body 2 and the sealing support 25. The reinforcing rib 32 can enhance the deformation resistance of the sealing support 25, thereby improving the stability of the sealing device 24.

[0041] It should be noted that this article uses terms such as "first" and "second" to describe various components, but these components should not be limited by these terms. These terms are only used to distinguish one component from another.

[0042] The terms "up," "down," "left," and "right" used in this article to describe directions are for ease of explanation and are based on the directions shown in the accompanying drawings. In actual devices, these directions may vary depending on how the device is placed.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A dust and steam prevention device for the kiln head of a zinc oxide volatilization kiln, comprising a kiln head hood, a kiln body connected to one side of the kiln head hood, and a discharge port provided at its bottom, wherein a feed pipe is connected to the discharge port, and a chute is connected to the lower end of the feed pipe, characterized in that: The lower end of the chute is connected to a dust collection chamber, the lower end of the dust collection chamber is connected to a slag pool, and the upper end of the dust collection chamber is connected to an exhaust pipe. The inner side of the feed pipe is rotatably connected to a vertical first water vapor baffle, which is located at the inlet of the chute. The inner side of the dust collection chamber is rotatably connected to a vertical second water vapor baffle, which is located at the outlet of the chute. The lower end of the dust collection chamber extends into the slag pool below the horizontal plane.

2. The dust and steam prevention device for the kiln head of a zinc oxide volatilization kiln as described in claim 1, characterized in that: The dust collection chamber and / or exhaust stack are connected to a high-pressure spray device. The high-pressure spray device includes a liquid storage tank and a main pipe connected to the liquid storage tank. At least one spray pipe is connected to one end of the main pipe. The end of the spray pipe away from the main pipe extends into the dust collection chamber or exhaust stack. The spray pipe is equipped with multiple nozzles.

3. The dust and steam prevention device for the kiln head of a zinc oxide volatilization kiln as described in claim 2, characterized in that: The number of spray pipes is 3, one of which extends into the dust collection chamber at the end away from the main pipe, and the other two spray pipes extend into the exhaust pipe at the end away from the main pipe.

4. The dust and steam prevention device for the kiln head of a zinc oxide volatilization kiln as described in claim 2, characterized in that: The storage tank is equipped with a water pump, which is connected to the main pipe.

5. The dust and steam prevention device for the kiln head of a zinc oxide volatilization kiln as described in claim 1, characterized in that: A sealing device is provided at the connection between the kiln head cover and the kiln body.

6. The dust and steam prevention device for the kiln head of a zinc oxide volatilization kiln as described in claim 5, characterized in that: The sealing device includes a sealing support provided on the kiln body, at least one static sealing ring and a sealing plate. The top of the sealing support is connected to a sealing bracket, and at least one dynamic sealing ring is provided on the inner wall of the support near the hood. The static sealing ring is connected to the side of the kiln head hood near the kiln body, and it and the dynamic sealing ring are interlocked to form a sealed labyrinth structure. The sealing plate includes a transverse pressing plate and a longitudinal pressing plate integrally formed with the transverse pressing plate. One end of the transverse pressing plate is connected to the kiln head hood, and the bottom end of the longitudinal pressing plate is connected to the sealing bracket.

7. The dust and steam prevention device for the kiln head of a zinc oxide volatilization kiln as described in claim 6, characterized in that: A fastening device is provided between the sealing bracket and the longitudinal pressure plate.

8. The dust and steam prevention device for the kiln head of a zinc oxide volatilization kiln as described in claim 7, characterized in that: The fastening device includes a screw and a connecting plate. The bottom end of the connecting plate is connected to the sealing bracket and has a through hole. The longitudinal pressure plate has a screw hole. One end of the screw passes through the through hole and is threadedly connected to the screw hole, and the other end is connected to a nut.

9. The dust and steam prevention device for the kiln head of a zinc oxide volatilization kiln as described in claim 8, characterized in that: A spring and a washer are fitted on the screw. One end of the spring is connected to the connecting plate, and the other end is connected to the washer.

Images