Dust purification device
By designing a dust purification device for lime kilns, using water filtration and waterproofing measures, the problems of low dust purification efficiency and water vapor evaporation in lime kiln gas are solved, efficient dust recovery and purification are achieved, and product quality and equipment operation efficiency are improved.
Patent Information
- Application Number
- CN202421665977.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-15
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-15
AI Technical Summary
The prior art has problems such as decreasing dust removal efficiency, large equipment footprint, high investment, high maintenance costs, and difficult to achieve efficient dust recovery and solve water vapor evaporation problems in the dust purification in lime kiln gas.
A dust purification device was designed, including the tank body and the air intake pipe. Water pre-installed at the bottom of the tank body is used to capture lime dust. Through waterproofing measures such as ventilation hoods, water barriers and filters, combined with water filtration technology, lime dust in kiln gas is captured and precipitated, and the water level is automatically replenished and controlled through a circulating water pump and liquid level gauge to ensure the purification effect.
It effectively improves the purification efficiency of lime dust in lime kiln gas, ensures the cleanliness of carbon dioxide during the synthesis of light calcium carbonate, thereby improving the whiteness and purity of the product, and at the same time solves the problems of water vapor evaporation and churning, and improves the operating efficiency and reliability of the equipment.
Smart Images
Figure CN222900607U_ABST
Abstract
Description
Technical Field
[0001] The utility model is used in the field of dust purification, and particularly relates to a dust purification device. Background Art
[0002] Generally, lime kilns are available in steel mills. During the production of lime, waste gas containing a large amount of carbon dioxide is generated, with the carbon dioxide content reaching as high as 20%, which is a relatively good source of carbon dioxide and can be used in wet carbon fixation industrial production. However, since the lime kiln gas contains lime dust with a content of 1500 - 2000mg / m 3 , if not dust-removed, it will seriously affect the whiteness and purity of the product during carbonization.
[0003] If these dusts are directly used in the wet synthesis of light calcium carbonate, it will have a negative impact on the whiteness and purity of the light calcium carbonate product. Therefore, during the utilization of lime kiln gas, the problem of lime dust needs to be solved. Currently, the common method to solve the lime kiln gas dust problem is to use filtration and capture, such as using filtration devices like bag filters or high-efficiency filters to capture lime dust. Due to bag filters or other filters, after long-term use, the surfaces of the bags and filter meshes will become blocked due to dust accumulation, resulting in a decrease in dust removal efficiency, and even affecting the operation of the equipment. Moreover, the equipment occupies a large area, requires a large investment, and has high maintenance and repair costs. Especially under high-temperature and large ventilation volume conditions, there is currently no effective method to achieve efficient dust recovery and solve the problem of water vapor evaporation. Content of the Utility Model
[0004] The purpose of the utility model is to solve at least one of the technical problems existing in the prior art, and to provide a dust purification device.
[0005] The technical solution adopted by the utility model to solve its technical problems is:
[0006] A dust purification device includes a tank body and an air inlet pipe. The air inlet pipe is connected into the tank body and extends towards the bottom of the tank body. The end of the air inlet pipe forms an air outlet, and an air vent hood is provided at the air outlet of the air inlet pipe. The air vent hood has an outwardly expanding port extending towards the bottom of the tank body.
[0007] In combination with the above implementation manner, in some implementation manners, an exhaust pipe is provided at the top of the tank body, and a filter screen is provided at the inlet of the exhaust pipe.
[0008] In combination with the above implementation manner, in some implementation manners, the exhaust pipe extends in the height direction, and the length of the exhaust pipe is not less than 800mm.
[0009] In combination with the above implementation manner, in some implementation manners, an induced draft fan is provided at the outlet of the exhaust pipe.
[0010] In combination with the above implementation manners, in some implementation manners, a water baffle is provided below the air outlet inside the tank body, and the water baffles are arranged in a relatively staggered manner.
[0011] In combination with the above implementation manners, in some implementation manners, the ventilation hood is provided with multiple layers of mesh holes.
[0012] In combination with the above implementation manners, in some implementation manners, the bottom of the tank body forms a conical bottom extending downward, the conical bottom is provided with a first sewage discharge port, and the first sewage discharge port is provided with a first control valve.
[0013] In combination with the above implementation manners, in some implementation manners, the first sewage discharge port is connected to a sewage sedimentation tank, the sewage sedimentation tank is provided with a water inlet pipe and a circulating water pipe, one end of the circulating water pipe is connected to the sewage sedimentation tank, and the other end is connected to the tank body, and the circulating water pipe is provided with a circulating water pump.
[0014] In combination with the above implementation manners, in some implementation manners, the tank body is provided with a first liquid level gauge, the sewage sedimentation tank is provided with a second liquid level gauge, the water inlet pipe is provided with a second control valve, the dust purification device further includes a controller, and the first liquid level gauge, the second liquid level gauge, the circulating water pump, the first control valve, and the second control valve are all connected to the controller.
[0015] In combination with the above implementation manners, in some implementation manners, the bottom of the sewage sedimentation tank is provided with a second sewage discharge port, and the second sewage discharge port is provided with a third control valve.
[0016] One of the technical solutions in the above technical solutions has at least the following advantages or beneficial effects: The technical solution of the present invention can be used for the dust treatment of a lime kiln. Specifically, in the treatment process, lime dust in the kiln gas is captured and precipitated through water filtration, and particulate matter such as lime powder in the kiln gas is purified. This device is mainly used for the purification of lime kiln gas containing a large amount of dust in the semi-dry desulfurized ash wet carbon fixation and new material preparation system to ensure the cleanliness of carbon dioxide in the kiln gas used in the synthesis process of light calcium carbonate, thereby improving the whiteness and purity of light calcium carbonate.
[0017] When the high-temperature kiln gas containing dust enters the tank body through the air inlet pipe, due to the high ventilation volume, pressure, and gas temperature, problems such as water vapor evaporation and churning will occur. The present invention effectively prevents water churning and spraying by adopting waterproof measures such as a ventilation hood.
[0018] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings
[0019] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, where:
[0020] Figure 1 is a schematic structural diagram of an embodiment of the present utility model. Detailed implementation manners
[0021] This part will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The function of the drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but it should not be construed as a limitation on the protection scope of the present utility model.
[0022] In the present utility model, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of the present utility model, rather than indicating or implying that the technical features referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present utility model.
[0023] In the present utility model, the meaning of "several" is one or more, the meaning of "multiple" is two or more, and "greater than", "less than", "exceeding", etc. are understood as not including the present number; "above", "below", "within", etc. are understood as including the present number. In the description of the present utility model, if "first" and "second" are described, they are only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.
[0024] In the present utility model, unless otherwise clearly defined, terms such as "arranged", "installed", "connected", etc. should be understood in a broad sense. For example, they can be directly connected, or indirectly connected through an intermediate medium; they can be fixedly connected, or detachably connected, or integrally formed; they can be mechanically connected, or electrically connected or capable of communicating with each other; they can be the communication inside two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution.
[0025] Among them, Figure 1 a reference direction coordinate system of the embodiment of the present utility model is given. The following will be described in conjunction with Figure 1 the directions shown to illustrate the embodiments of the present utility model.
[0026] See Figure 1, an embodiment of the present utility model provides a dust purification device, which includes a tank body 1 and an air inlet pipe 2. The tank body 1 has an inner cavity in the height direction. The bottom of the inner cavity forms a water storage cavity, and the top forms an exhaust cavity. The air inlet pipe 2 is connected into the tank body 1 and extends towards the bottom of the tank body 1. The end of the air inlet pipe 2 forms an air outlet, and the air inlet pipe 2 is provided with a ventilation hood 3 at the air outlet. The ventilation hood 3 has an outwardly expanding port extending towards the bottom of the tank body 1.
[0027] Combined with Figure 1 , the technical solution of the present utility model can be used for dust treatment of lime kilns. Specifically, during the treatment process, water for capturing lime dust is pre-installed at the bottom of the tank body 1, and the liquid level of the water submerges the ventilation hood 3 of the air inlet pipe 2. The high-temperature kiln gas containing dust is introduced into the air inlet pipe 2 and enters the tank body 1 from the air outlet of the air inlet pipe 2. During this period, the ventilation hood 3 extends towards the bottom of the tank body 1 in an inverted shape, which is used to suppress the upward water tumbling and spraying.
[0028] The lime dust in the kiln gas is captured and precipitated by water filtration, and the particulate matter such as lime powder in the kiln gas is purified. This device is mainly used for purifying the lime kiln gas containing a large amount of dust in the semi-dry desulfurization ash wet carbon fixation and new material preparation system to ensure the cleanliness of carbon dioxide in the kiln gas used in the synthesis process of light calcium carbonate, thereby improving the whiteness and purity of light calcium carbonate.
[0029] When the high-temperature kiln gas containing dust enters the tank body 1 through the air inlet pipe 2, due to the high ventilation volume, pressure, and gas temperature, problems such as water vapor evaporation and tumbling will occur. The present utility model effectively prevents water tumbling and spraying by adopting waterproof measures such as the ventilation hood 3.
[0030] Furthermore, referring to Figure 1 , an exhaust pipe 4 is provided at the top of the tank body 1. The filtered kiln gas is discharged from the tank body 1 through the exhaust pipe 4. Among them, a filter screen 5 is provided at the inlet of the exhaust pipe 4. The filter screen 5 forms a waterproof structure to further ensure that water splashes will not enter the exhaust pipe 4.
[0031] Furthermore, referring to Figure 1 , the exhaust pipe 4 extends in the height direction, and the length of the exhaust pipe 4 is not less than 800 mm. The exhaust pipe 4 is arranged in a vertically upward exhaust manner, and the water is returned to the tank body 1 through condensation, which can further effectively prevent clear water from entering the exhaust pipe 4.
[0032] Furthermore, referring to Figure 1 , a pair of relatively staggered baffle plates 6 are provided below the air outlet in the tank body 1 to prevent water from splashing into the exhaust pipe 4.
[0033] Embodiments of the present utility model adopt three - level filtering and waterproof measures such as a ventilation hood 3, water baffle plates 6 arranged relatively staggeredly, a filter screen 5, etc., to ensure that water splashes do not enter the intake and exhaust pipe 4. It effectively solves problems such as evaporation of high - flow high - temperature kiln gas and eruption and churning of water vapor.
[0034] In some embodiments, referring to Figure 1 , at the outlet of the exhaust pipe 4, an induced draft fan 7 is provided, and the induced draft fan 7 is used to discharge the gas treated by filtration and adsorption out of the tank body 1.
[0035] In some embodiments, referring to Figure 1 , the ventilation hood 3 is provided with multiple layers of mesh holes 8. The kiln gas introduced by the intake pipe 2 can pass through the mesh holes 8 of the ventilation hood 3, be layered with the water in the tank body 1, and come into full contact, improving the capture effect of lime dust and effectively suppressing the upward churning and spraying of water.
[0036] Furthermore, to prevent water vapor evaporation from carrying away dust, the system is provided with a sewage sedimentation and cooling water circulation device.
[0037] Referring to Figure 1 , the bottom of the tank body 1 forms a downward - extending conical bottom, and the conical bottom is provided with a first sewage discharge port 9, and the first sewage discharge port 9 is provided with a first control valve 10.
[0038] The first sewage discharge port 9 is connected to a sewage sedimentation tank 11. The sewage sedimentation tank 11 is provided with a water inlet pipe 12 and a circulating water pipe 13. One end of the circulating water pipe 13 is connected to the sewage sedimentation tank 11, and the other end is connected to the tank body 1. The circulating water pipe 13 is provided with a circulating water pump 14.
[0039] The tank body 1 is provided with a first liquid level gauge 15, the sewage sedimentation tank 11 is provided with a second liquid level gauge 16, the water inlet pipe 12 is provided with a second control valve 17, and the dust purification device further includes a controller 18. The first liquid level gauge 15, the second liquid level gauge 16, the circulating water pump 14, the first control valve 10, and the second control valve 17 are all connected to the controller 18.
[0040] The bottom of the sewage sedimentation tank 11 is provided with a second sewage discharge port 19, and the second sewage discharge port 19 is provided with a third control valve 20.
[0041] The specific principle is as follows:
[0042] (1) A sewage sedimentation tank is provided at the bottom of the tank body 1. The first control valve 10 is used to control the sewage discharge through the first sewage discharge port 9, and the high - temperature water is cooled in the sewage sedimentation tank 11. Further, temperature monitoring can be set. When the water temperature reaches 80 °C, the first control valve 10 is started for sewage discharge to prevent the water from boiling due to excessive temperature.
[0043] (2) When the first liquid level gauge 15 monitors that the water level in the tank body 1 is at a low level, the circulating water pump 14 is automatically controlled to replenish water, and the water replenishment stops automatically when it reaches the high level.
[0044] (3) When the second liquid level gauge 16 monitors that the water level in the sewage sedimentation tank 11 is at the low water level, the second control valve 17 is automatically controlled to open the tap water for water replenishment, and the water replenishment automatically stops when the high water level is reached.
[0045] (4) The sewage discharge control of the sewage sedimentation tank 11 is controlled by the third control valve 20.
[0046] Through the above measures, it is possible to effectively prevent the water in the recovery tank from boiling, maintain a certain water level, and ensure the effective purification of dust.
[0047] The embodiments of the present utility model have the following advantages:
[0048] 1. Adopting three - level filtering and waterproof measures such as the ventilation hood 3, the water baffle 6, and the filter screen 5 ensures that water splashes do not enter the intake and exhaust pipe 4.
[0049] 2. By continuously and automatically replenishing cold water, it is possible to prevent the water temperature in the tank body 1 from being too high and generating water vapor, thereby effectively avoiding the water vapor from carrying dust into the exhaust pipe 4.
[0050] 3. Adopting an automatic liquid level monitoring and automatic water replenishment device to prevent human monitoring errors.
[0051] In the description of this specification, the description referring to terms such as "example", "embodiment" or "some embodiments" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above - mentioned terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.
[0052] Certainly, the present invention is not limited to the above - mentioned embodiments. Those skilled in the art can also make equivalent deformations or substitutions without departing from the spirit of the present utility model, and these equivalent deformations or substitutions are all included in the scope defined by the claims of this application.
Claims
1. A dust purification device, characterized in that: The invention comprises a tank body and an air inlet pipe, wherein the air inlet pipe is connected to the tank body and extends to the bottom of the tank body, an air outlet is formed at the end of the air inlet pipe, and a ventilation cover is provided at the air outlet, and the ventilation cover has an outward expansion port extending to the bottom of the tank body.
2. The dust purification device according to claim 1, characterized in that: An exhaust pipe is arranged on the top of the tank body, and a filter screen is arranged at the inlet of the exhaust pipe.
3. The dust purification device according to claim 2, characterized in that: The exhaust pipe extends in a height direction, and the length of the exhaust pipe is not less than 800 mm.
4. The dust purification device according to claim 2, characterized in that: An induced draft fan is arranged at the outlet of the exhaust pipe.
5. The dust purification device according to claim 2, characterized in that: The tank body is provided with water baffles arranged relatively staggered below the gas outlet.
6. The dust purification device according to claim 1, characterized in that: The ventilation cover is provided with multiple layers of mesh holes.
7. The dust purification device according to claim 1, characterized in that: The bottom of the tank body forms a cone bottom extending downwards, the cone bottom is provided with a first sewage outlet, and the first sewage outlet is provided with a first control valve.
8. The dust purification device according to claim 7, characterized in that: The first sewage outlet is connected to a sewage sedimentation tank, and the sewage sedimentation tank is provided with a water inlet pipe and a circulating water pipe. One end of the circulating water pipe is connected to the sewage sedimentation tank, and the other end is connected to the tank body. The circulating water pipe is provided with a circulating water pump.
9. The dust purification device according to claim 8, characterized in that: The tank body is provided with a first liquid level gauge, the sewage sedimentation tank is provided with a second liquid level gauge, the water inlet pipe is provided with a second control valve, and the dust purification device also includes a controller, and the first liquid level gauge, the second liquid level gauge, the circulating water pump, the first control valve, and the second control valve are all connected to the controller.
10. The dust purification device according to claim 8, characterized in that: A second sewage outlet is provided at the bottom of the sewage sedimentation tank, and a third control valve is provided at the second sewage outlet.