Dust removal device and dust removal process for dust particles

Abstract

The invention discloses a dust particle dust removal device and a dust removal process, and belongs to the technical field of flue gas dust removal, the dust particle dust removal device comprises a dust removal cavity, and liquid for dust removal is preloaded in the dust removal cavity; an air inlet and an air outlet are formed in the side wall of the dust removal cavity, and the height of the liquid is smaller than the height of the air inlet and the height of the air outlet; a flow guide pipe is arranged on the inner wall of the dust removal cavity, the upper end opening of the flow guide pipe is in butt joint with the air inlet, and the lower outlet of the flow guide pipe is inserted into the liquid; a cyclone separator is mounted outside the flow guide pipe, and a spraying pipe is mounted on the inner wall of the dust removal cavity; and a high-pressure fan is mounted at the top of the dust removal cavity. By means of a multi-stage dust removal mode of water washing, dust particles in flue gas can be efficiently removed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of flue gas dust removal, and particularly relates to a dust particle dust removal device and a dust removal process. BACKGROUND

[0002] In the daily production and material transportation process of a steel enterprise, a large amount of flue gas dust is inevitably generated. The dust diffuses in the air, especially in the working site where the flue gas dust pollution is extremely serious. The health of the labor workers working in this environment for a long time is seriously threatened. Not only respiratory diseases are easily caused, but also the skin and eyes are stimulated and harmed. At the same time, the diffusion of the dust also has a very negative impact on the overall environment of the site, causing the air quality to decrease and the visibility to decrease, and even affecting the normal operation and maintenance of the equipment.

[0003] However, although a variety of dust removal and dust suppression technologies are currently applied in actual production, due to the limitations of these technologies, they are more suitable for overall dust removal treatment in places where dust generation points are relatively concentrated and the treatment area is relatively large. In this case, not only a large amount of equipment cost and operation and maintenance cost need to be invested, but also the actual dust suppression effect is often not ideal and it is difficult to achieve the expected environmental protection standard. Especially for specific areas with small area and scattered points, how to effectively carry out dust removal treatment has always been a difficult problem and bottleneck in the field of dust control.

[0004] At present, the dry dust removal process is commonly used in the field of industrial dust removal. This process is widely applicable, especially suitable for large centralized dust removal systems, and can handle a large amount of flue gas and dust. However, the dry dust removal process also has some obvious shortcomings, such as relatively high equipment cost, large occupied area, and the need to be equipped with complex pipeline systems and auxiliary equipment such as fans, which makes it not very suitable for application in scattered points. Not only is it difficult to install, but also it is less economical.

[0005] Therefore, in view of the above problems and status, it is urgent to develop a new dust removal process. This process should have the characteristics of small occupied area, simple process flow, convenient operation and maintenance, and be applicable to the dust removal needs of scattered points. Only in this way, can the current dust control problem in the production and transportation process of steel enterprises be effectively solved, the health of labor workers be effectively protected, the site environment be improved, and the green and sustainable production goal be achieved. SUMMARY

[0006] The purpose of the present application is to provide a dust particle dust removal device and a dust removal process, which utilizes a multi-stage dust removal method of water washing to efficiently remove dust particles in flue gas.

[0007] To achieve the above object, the present application provides the following technical solutions.

[0008] The first object of the present application is to provide a dust particle dust removal device, comprising a dust removal cavity, a liquid for dust removal is preloaded in the dust removal cavity; an air inlet and an air outlet are arranged on the side wall of the dust removal cavity, the height of the liquid is less than the height of the air inlet and the air outlet; a flow guide pipe is arranged on the inner wall of the dust removal cavity, the upper port of the flow guide pipe is connected with the air inlet, and the lower outlet of the flow guide pipe is inserted into the liquid; a cyclone separator is arranged outside the flow guide pipe, a spray pipe is arranged on the inner wall of the dust removal cavity, and a high-pressure fan is arranged on the top of the dust removal cavity.

[0009] Preferably, a baffle plate is arranged on the inner wall of the dust removal cavity and located above the spray pipe.

[0010] Preferably, the height of the air inlet is less than the height of the air outlet.

[0011] Preferably, a funnel-shaped sedimentation tank is arranged at the bottom of the dust removal cavity.

[0012] Preferably, a blowdown pipe is connected to the bottom of the sedimentation tank, and a valve is arranged on the blowdown pipe.

[0013] Preferably, a water supplement pipe is arranged on the side wall of the dust removal cavity.

[0014] The second object of the present application is to provide a dust particle dust removal process, comprising:

[0015] S1, starting the high-pressure fan to form a negative pressure in the dust removal cavity, so that an air flow is generated in the dust removal cavity from bottom to top;

[0016] S2, starting the cyclone separator to form a vortex of the liquid;

[0017] S3, the flue gas enters the liquid through the air inlet and the flow guide pipe, and the liquid dust particles are adsorbed under the action of the vortex; part of the particles adsorbing the liquid sinks to the bottom of the liquid, and part of the particles adsorbing the liquid rises under the action of the air flow;

[0018] S4, starting the spray pipe to spray the rising particles, part of the particles in the air flow sink after adsorbing the liquid, and other particles in the air flow continue to rise after adsorbing the liquid and are discharged through the air outlet.

[0019] Preferably, S4 comprises: the other particles in the air flow continue to rise after adsorbing the liquid, touch the lower surface of the baffle plate, and the liquid and the particles fall after gathering, and the air flow continues to rise.

[0020] Preferably, in S2, the cyclone separator is started and stopped in an intermittent mode.

[0021] Compared with the prior art, the present application has the beneficial effects that:

[0022] The present application adopts a multi-stage dust removal equipment and method based on water washing technology, which can efficiently and thoroughly remove dust particles contained in flue gas. The specific operation steps are as follows: first, by using a cyclone separator as a key equipment, the dust particles entering the system are quickly and fully mixed with the liquid medium in the high-speed rotating flow field. This process not only effectively reduces the temperature of the flue gas and reduces the influence of heat energy on the subsequent dust removal equipment, but more importantly, enables the liquid medium to adhere to the surface of the dust particles to the greatest extent, laying a solid foundation for the subsequent dust removal link. Then, under the strong driving action of the negative pressure airflow, part of the dust particles mixed with the liquid medium will rise with the airflow, at this time the system will start the spraying device, and the liquid medium is sprayed out in the form of mist through the high-pressure nozzle, and the dust particles rising in the air are subjected to secondary dust removal treatment, further improving the dust removal effect. Finally, by using the carefully designed baffle structure, the rising path of the remaining dust particles is ingeniously blocked, ensuring that only the clean airflow that has been purified multiple times and meets the emission standard can be smoothly discharged from the outlet of the system, thereby realizing efficient removal of dust particles in flue gas. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The structure principle diagram of the preferred embodiment of the present application is shown in the figure.

[0024] Figure 2 The principle diagram of the preferred embodiment of the present application when working is shown in the figure.

[0025] Wherein, 1, high-pressure fan; 2, air inlet; 3, cyclone separator; 4, spraying pipe; 5, baffle; 6, air outlet; 7, sedimentation tank; 8, blowdown pipe; 9, water supply pipe; 10, flow guide pipe. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0027] Embodiment one:

[0028] Please refer to Figure 1 and Figure 2 , a dust particle dust removal device, comprising a dust removal cavity;

[0029] The liquid for dust removal is preloaded in the dust removal cavity; the liquid can be water or water added with chemical reaction (according to the components in the flue gas, a suitable chemical solvent can be selected);

[0030] An air inlet 2 and an air outlet 6 are arranged on the side wall of the dust removal cavity, the height of the liquid is less than the height of the air inlet 2 and the air outlet 6; the air inlet 2 is connected with the flue gas discharge pipeline, and the air outlet can directly discharge the purified gas into the atmosphere;

[0031] A flow guide pipe 10 is arranged on the inner wall of the dust removal cavity, the upper end of the flow guide pipe 10 is connected with the air inlet 2, and the lower outlet of the flow guide pipe 10 is inserted into the liquid; the core function of the flow guide pipe 10 is to guide the flue gas to be purified into the dust removal cavity for purification; the second function of the flow guide pipe 10 is to divide the liquid in the dust removal cavity into an inner pipe part and an outer pipe part, when the high-pressure fan 1 works, the dust removal cavity presents a negative pressure, at this time, the pressure of the inner pipe part is greater than that of the outer pipe part, and at this time, the liquid height of the inner pipe part is less than that of the outer pipe part;

[0032] A cyclone separator 3 is arranged outside the flow guide pipe 10, and a spray pipe 4 is arranged on the inner wall of the dust removal cavity; a high-pressure fan 1 is arranged on the top of the dust removal cavity.

[0033] The working principle of the above preferred embodiment one is as follows:

[0034] Embodiment two: a dust particle dust removal process, comprising:

[0035] S1, the high-pressure fan 1 is started, and a negative pressure is formed in the dust removal cavity, so that an upward air flow is generated in the dust removal cavity;

[0036] S2, the cyclone separator 3 is started, so that the liquid forms a vortex;

[0037] S3, the flue gas enters the liquid through the air inlet 2 and the flow guide pipe 10, and the liquid dust particles are adsorbed under the action of the vortex; part of the particles adsorbing the liquid sink to the bottom of the liquid, and part of the particles adsorbing the liquid rise under the action of the air flow;

[0038] S4, the spray pipe 4 is started, and the rising particles are sprayed; part of the particles in the air flow sink after adsorbing the liquid, and other particles in the air flow continue to rise after adsorbing the liquid and are discharged through the air outlet 6.

[0039] Embodiment three, in order to further improve the effect of flue gas purification, on the basis of the above preferred embodiment one,

[0040] A baffle 5 is arranged on the inner wall of the dust removal cavity, and the baffle 5 is located above the spray pipe 4.

[0041] The working principle of the above preferred embodiment three is as follows:

[0042] Embodiment four: a dust particle dedusting process, comprising:

[0043] S1, starting the high-pressure fan 1 to form a negative pressure in the dedusting cavity, so that an airflow is generated in the dedusting cavity from bottom to top;

[0044] S2, starting the cyclone separator 3 to make the liquid form a vortex; the cyclone separator 3 can be selectively opened and closed in a gap mode;

[0045] S3, the flue gas enters the liquid through the air inlet 2 and the flow guide pipe 10, and the liquid dust particles are adsorbed under the action of the vortex; part of the particles adsorbing the liquid sink to the bottom of the liquid, and part of the particles adsorbing the liquid rise under the action of the airflow;

[0046] S4, starting the spray pipe 4 to spray the rising particles, part of the particles in the airflow sink after adsorbing the liquid, and the other particles in the airflow continue to rise after adsorbing the liquid, and the other particles in the airflow continue to rise after adsorbing the liquid, touch the lower surface of the baffle 5, and the liquid and the particles are collected and then fall, and the airflow continues to rise; and is discharged through the air outlet 6.

[0047] In order to further improve the efficiency of flue gas purification, on the basis of the above preferred embodiment one,

[0048] The height of the air inlet 2 is less than the height of the air outlet 6.

[0049] A funnel-shaped sedimentation tank 7 is arranged at the bottom of the dedusting cavity.

[0050] The bottom of the sedimentation tank 7 is connected with a blowdown pipe 8, and a valve is installed on the blowdown pipe 8.

[0051] A water supplement pipe 9 is installed on the side wall of the dedusting cavity.

[0052] The dedusting device in the application mainly comprises a high-pressure fan, a dedusting cavity, a cyclone separator, a spray pipe, a baffle, a sedimentation tank, a blowdown pipe, a water supplement pipe, etc., mainly utilizes the high-pressure fan to generate an airflow channel, and utilizes liquid (such as washing liquid) to purify dust particles. The dust particles in the flue gas can be effectively removed. Since the mass transfer and heat transfer processes occur simultaneously during the contact between the gas and the liquid, the dedusting device has the effects of dust removal, flue gas cooling and harmful gas absorption.

[0053] The dust removal process as a whole adopts a high-pressure fan, a carefully designed air duct, and a high-efficiency cyclone separator as core components. Its working principle is to make the dust-containing gas and the liquid come into close and sufficient contact. In this process, the inertial collision effect between the liquid and the dust particles, as well as the interaction between the liquid and the dust particles in the mixing process, effectively promote the dust particles to be captured. Through this unique method, the device can achieve efficient separation of liquid and dust particles, thereby achieving the purpose of purifying the gas.

[0054] First, a certain amount of water is introduced into the device. When the high-pressure fan is started, a large suction force is generated, forming a negative pressure inside the device. As shown in Figure 2 , the water level in part A will gradually decrease, and the water level in part B will gradually rise. After the water level in part B rises, the water enters the cyclone separator and rotates therein. When the dust-containing gas enters the cyclone separator, it will be intercepted by the water. The dust-containing gas flows from bottom to top and mixes with the water fully, just like blowing air into water, and the water generates a strong splash. The strong splash fully washes the dust, and most of the dust is adsorbed in the water, and then the dust-containing water will settle. In this stage, the impact force of the water and the adsorption effect of the liquid droplets are mainly relied on to separate larger dust particles from the gas flow, which is the primary capture stage.

[0055] The spray pipe sprays water mist from top to bottom to capture the remaining dust particles in the gas flow. Under the action of the water mist, the fine dust particles in the dust-containing gas are fully wetted and collide with each other to form a dust-water mixture. The residual dust particles in the gas flow collide with the baffle during the rising process and coagulate into larger water droplets, thereby further removing the dust particles captured by the water mist.

[0056] After multiple levels of treatment, the dust particles are all separated into the sedimentation tank and are periodically discharged through the blowdown pipe. The cleaned gas is discharged through the top air outlet, and the dust removal process of the dust particles is completed. Through compact design and multi-stage particle removal process, efficient removal of particulate matter is achieved. With these technologies, the gas and the washing liquid are fully contacted, the contaminated particles are captured to the maximum extent, and the purified gas is ensured to meet the emission standards.

[0057] Since mass transfer and heat transfer occur simultaneously during the contact of the gas and the liquid, the device not only has a dust removal function, but also can achieve the functions of flue gas cooling and harmful gas absorption. The side of the device is provided with an air inlet, an air outlet, and a water supplement pipe for periodically supplementing the water in the device.

[0058] When the high pressure fan 1 starts, a large suction force is generated, causing a negative pressure inside the device, and the water level will gradually decrease. Due to the pressure difference, when the cyclone separator 3 reaches a certain water level, water will be stirred up. Water enters the cyclone separator under the action of suction, and is rotated by the high pressure fan. When the dust-containing gas enters the cyclone separator through the air inlet 2, the dust particles in the dust-containing gas will be intercepted by the water vortex. The dust-containing gas flows from bottom to top and is fully mixed with water, like blowing air into water, and the water produces a strong splash. The strong splash fully washes the dust, adsorbs most of the dust in the water, and then the dust-containing water settles. This stage mainly relies on the impact force of water and the adsorption effect of liquid droplets to separate larger dust particles from the gas flow, which is the primary capture.

[0059] The spray pipe 4 sprays water mist from top to bottom, capturing the remaining dust particles in the gas flow. Under the action of water mist, fine dust particles in the dust-containing gas are fully wetted and collide with each other to form a dust-water mixture. The residual dust particles in the gas flow collide with the baffle 5 during the upward process, and agglomerate into larger water droplets, further removing the dust particles captured by the water mist.

[0060] After multiple levels of processing, all dust particles are separated into the sedimentation tank 7 and are periodically discharged through the blowdown pipe 8. The cleaned gas is discharged through the top air outlet 6, completing the dust removal process of dust particles and ensuring that the purified gas meets the emission standards.

[0061] Because mass transfer and heat transfer occur simultaneously during the contact between gas and liquid, the device not only has dust removal function, but also can cool the flue gas and absorb harmful gases. The device is provided with an air inlet, an air outlet and a water supplement pipe 9 on the side, and the water supplement pipe is used to periodically supplement the water in the device.

[0062] Although embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made thereto without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dust particle removal device, characterized in that, The system includes a dust removal chamber pre-filled with a dust removal liquid; an air inlet (2) and an air outlet (6) are provided on the side wall of the dust removal chamber, and the height of the liquid is less than the height of the air inlet (2) and the air outlet (6); a guide pipe (10) is provided on the inner wall of the dust removal chamber, the upper end of the guide pipe (10) is connected to the air inlet (2), and the lower outlet of the guide pipe (10) is inserted into the liquid; a cyclone separator (3) is installed outside the guide pipe (10), and a spray pipe (4) is installed on the inner wall of the dust removal chamber; a high-pressure blower (1) is installed on the top of the dust removal chamber.

2. The dust particle removal device according to claim 1, characterized in that, A baffle plate (5) is installed on the inner wall of the dust removal chamber, and the baffle plate (5) is located above the spray pipe (4).

3. The dust particle removal device according to claim 1, characterized in that, The height of the air inlet (2) is less than the height of the air outlet (6).

4. The dust particle removal device according to claim 1, characterized in that, A funnel-shaped sedimentation tank (7) is provided at the bottom of the dust removal chamber.

5. The dust particle removal device according to claim 4, characterized in that, The bottom of the sedimentation tank (7) is connected to a drain pipe (8), and a valve is installed on the drain pipe (8).

6. The dust particle removal device according to claim 1, characterized in that, A water supply pipe (9) is installed on the side wall of the dust removal chamber.

7. A dust particle removal process, characterized in that, include: S1. Turn on the high-pressure blower (1) to create a negative pressure in the dust removal chamber, so that the dust removal chamber generates an airflow from bottom to top. S2. Turn on the cyclone separator (3) to make the liquid form a vortex; S3. Flue gas enters the liquid through the air inlet (2) and the guide pipe (10). At the same time, under the action of the vortex, the liquid dust particles are adsorbed. Some of the adsorbed liquid particles sink to the bottom of the liquid, and some of the adsorbed liquid particles rise under the action of the airflow. S4. Turn on the spray pipe (4) to spray the rising particles. Some particles in the airflow adsorb the liquid and sink, while other particles in the airflow adsorb the liquid and continue to rise, and are discharged through the air outlet (6).

8. The dust particle removal process according to claim 7, characterized in that, S4 includes: other particles in the airflow adsorb liquid and continue to rise, touch the lower surface of the baffle (5), the liquid and particles gather and fall, and the airflow continues to rise.

9. The dust particle removal process according to claim 7, characterized in that, In S2, the cyclone separator is intermittently turned on and off (3).

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