CN206646137U - Desulfurization station dust arrester - Google Patents

Abstract

The utility model relates to a dedusting device for a molten iron desulfurization station, which comprises a dedusting cover and a compressed air ring pipe sheathed outside the dust removal cover. The compressed air ring pipe is connected with a compressed air supply pipe, and a plurality of compressed air pipes are arranged at the bottom nozzles, each compressed air nozzle is arranged around the dust cover and communicates with the inner cavity of the compressed air ring pipe. Arrange the compressed air ring pipe around the dust removal hood, spray compressed air through each compressed air nozzle, and quickly form an invisible air curtain around the dust removal hood to isolate the diffusion channel of the escaping hot smoke, thereby improving the collection of smoke and dust The collection efficiency and the smoke and dust collection effect of the dust removal hood can effectively improve the workshop environment and provide health protection for on-site workers; since compressed air is used as the working medium, there will be no potential danger of explosion caused by mechanical water.

Description

Dust removal device of hot metal desulfurization station

technical field

The utility model belongs to the technical field of metallurgy, in particular to the technical field of KR desulfurization, in particular to a dedusting device for a molten iron desulfurization station.

Background technique

Hot metal desulfurization is one of the common out-of-furnace treatment technologies in steelmaking production. In recent years, as the market has increasingly stringent requirements on the quality of steel products, hot metal desulfurization treatment has become an important means to improve the quality of molten steel, expand the production range of variety steel and improve the operation of converters. At present, the mainstream methods of domestic molten iron pretreatment are mechanical stirring method and injection method, among which mechanical stirring method is the most widely used. The mechanical stirring method is to insert a stirring head made of refractory material into a certain depth under the liquid level of the molten iron tank and make it rotate, driving the liquid level of the molten iron to form a "V"-shaped vortex with a low center and high surroundings. The feeder is added to the surface of the molten iron and is vortexed into the molten iron. The desulfurizer reacts chemically with the sulfur in the molten iron during continuous stirring to achieve the purpose of desulfurization.

During the production process of the hot metal desulfurization station by the mechanical stirring method, a large amount of smoke and dust is generated when the molten iron tank is tilted, slag removed, stirred, and unloaded. The dust components are mainly graphite flakes, iron oxide flakes, lime powder and so on. If the suction capacity of the dust removal system is limited, a large amount of high-temperature smoke and dust will easily disperse in the workshop, resulting in the deterioration of the environment in the desulfurization slag area and seriously threatening production safety and personnel health.

At present, the usual solution is to increase the effective collection rate of smoke and dust through the reasonable matching of fan air volume and the optimized design of the dust collection cover above the molten iron tank. Enterprises with conditions can also add a roof cover on the top of the plant to capture the dust that cannot be captured in the desulfurization station. smoke. The disadvantages of these methods are that the original dust removal system needs to be greatly modified, the amount of investment is high at one time, the transformation period is long, and the existing production is greatly affected.

Utility model content

The embodiment of the utility model relates to a dedusting device of a molten iron desulfurization station, which can at least solve some defects of the prior art.

The embodiment of the utility model relates to a dust removal device for a molten iron desulfurization station, which includes a dust removal cover and a compressed air ring pipe sleeved outside the dust removal cover. The compressed air ring pipe is connected with a compressed air supply pipe. The bottom of the air ring pipe is provided with a plurality of compressed air nozzles, and each of the compressed air nozzles is arranged around the dust cover and communicates with the inner cavity of the compressed air ring pipe.

As one of the embodiments, the above-mentioned dedusting device of the molten iron desulfurization station further includes an aerosol ring pipe sleeved outside the dust removal cover, the aerosol ring pipe is connected with an aerosol source supply pipe, and the aerosol ring pipe is provided with There are a plurality of atomizing nozzles, each atomizing nozzle is arranged around the dust cover and its inlet port is connected with the inner cavity of the aerosol ring tube; the projection of the aerosol ring tube on the horizontal plane is located in the compressed air ring within the projection range of the tube on the horizontal plane.

As one of the embodiments, the above-mentioned dedusting device of the hot metal desulfurization station includes an annular distribution pipe, the distribution pipe is sleeved outside the dust cover, and an annular partition is arranged inside the distribution pipe, and the annular partition is vertically arranged and The distribution pipe body is divided into an outer ring half-pipe body and an inner ring half-pipe body. The outer ring half-pipe body is spliced to form the compressed air ring pipe, and the annular partition is spliced with the inner ring half-pipe body to form the aerosol ring pipe.

As one of the embodiments, along the circumferential direction of the distribution pipe, there is at least one compressed air nozzle between every two adjacent atomizing nozzles.

As one of the embodiments, the aerosol source supply pipe includes a compressed air branch pipe and a water branch pipe, the compressed air branch pipe is connected to the compressed air supply pipe, and the compressed air branch pipe is provided with a first control valve, The compressed air supply pipe is provided with a second control valve and a third control valve, and along the air flow direction, the second control valve and the third control valve are arranged on both sides of the side connection point of the compressed air branch pipe.

As one of the embodiments, each of the atomizing nozzles is a dry fog nozzle.

As one of the embodiments, the compressed air ring pipe is connected with a lift drive mechanism that drives it to lift vertically.

As one of the embodiments, the compressed air supply pipe is connected with a centrifugal fan, and the driving motor of the centrifugal fan is a variable frequency motor.

The embodiment of the utility model has at least the following beneficial effects: the compressed air ring pipe is arranged around the dust removal cover, and the compressed air is sprayed through each compressed air nozzle to quickly form an invisible air curtain around the dust removal cover to isolate the escaping heat. The diffusion channel of the flue gas, so as to improve the dust collection efficiency of the dust and the dust collection effect of the dust removal hood, effectively improve the workshop environment, and provide health protection for the on-site workers; due to the use of compressed air as the working medium, there will be no explosion caused by mechanical water Potential danger; the method of setting compressed air ring pipes around the dust cover has less investment and short cycle, which can be applied to the dust removal system of the new hot metal desulfurization station, and is also suitable for the technical transformation of the existing system.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the present utility model, and those skilled in the art can also obtain other drawings according to these drawings without creative work.

Fig. 1 is a schematic structural view of a compressed air ring pipe provided outside a dust removal hood provided by an embodiment of the present invention;

Fig. 2 is a schematic cross-sectional view of the pipe body of the distribution pipe provided by the embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

As shown in Fig. 1, the utility model embodiment provides a kind of dedusting device of molten iron desulfurization station, comprises dedusting cover 1, also comprises the compressed air ring pipe 23 that is sleeved outside described dust removal cover 1, and described compressed air ring pipe 23 is connected with Compressed air supply pipe, the bottom of the compressed air ring pipe 23 is provided with a plurality of compressed air nozzles 231 , each of the compressed air nozzles 231 is arranged around the dust cover 1 and communicates with the inner cavity of the compressed air ring pipe 23 . The above-mentioned compressed air ring pipe 23 is arranged around the dust removal hood 1, and the compressed air is sprayed through each compressed air nozzle 231 to quickly form an invisible air curtain around the dust removal hood 1 to isolate the diffusion channel of the escaping hot smoke, thereby Improve the collection efficiency of smoke and dust and the dust collection effect of dust removal hood 1, effectively improve the workshop environment, and provide health protection for on-site workers; since compressed air is used as the working medium, there will be no potential danger of explosion caused by mechanical water; The method of arranging the compressed air ring pipe 23 around the cover 1 has less investment and a short period, and can be applied to the dust removal system of the newly-built molten iron desulfurization station, and is also applicable to the technical transformation of the existing system. Each of the above-mentioned compressed air nozzles 231 can be a circular hole or a square air supply hole, and compressed air nozzles can also be set at each compressed air nozzle 231; The curtain wall is suitable to prevent the smoke and dust above the molten iron tank 4 from overflowing the area of the desulfurization station; the compressed air nozzles 231 are preferably evenly spaced to form a uniform and continuous air curtain wall. The above-mentioned compressed air ring pipe 23 can be a circular ring pipe or a square ring pipe.

To further optimize the structure of the above-mentioned dust removal device, the above-mentioned hot metal desulfurization station dust removal device also includes an aerosol ring pipe 21 sleeved outside the dust removal cover 1, and the aerosol ring pipe 21 is connected with an aerosol source supply pipe. The pipe 21 is provided with a plurality of atomizing nozzles, each of the atomizing nozzles is arranged around the dust cover 1 and the inlet end is connected with the inner cavity of the aerosol ring pipe 21; the aerosol ring pipe 21 is on the horizontal plane The projection of is located within the projection range of the compressed air ring pipe 23 on the horizontal plane. That is to say, an aerosol spray mechanism is installed in the above-mentioned air curtain retaining wall to spray high-speed aerosol. This aerosol contains a large number of water particles with small particle size, fast speed and high kinetic energy. When the water particles contact with the smoke, First absorb the sensible heat of the flue gas and cool the flue gas below the condensation temperature, then collide with, bond and grow up with the dust particles in the flue gas. The flue gas is separated and settled on the ground, so as to play the role of flue gas cooling, purification and capture, and improve the efficiency of dust collection and flue gas purification; by controlling the amount of mist spray, it can realize rapid cooling of high-temperature flue gas in a short time , the volume is greatly shrunk, thereby reducing the air volume of the dust removal system and reducing the energy consumption cost of the dust removal system; due to the good atomization performance of the nozzle, the atomized water particles are all vaporized after contacting the high-temperature flue gas, and there will be no explosion caused by mechanical water potentially dangerous. Wherein, the above-mentioned aerosol source supply pipe mixes compressed air and water and supplies it to the aerosol ring pipe 21, and a plurality of aerosol nozzles 211 are arranged on the aerosol ring pipe 21, and each aerosol nozzle 211 can be connected by a connecting pipe. One atomizing nozzle, the connecting pipe can be a straight pipe or a curved pipe, and the spray angle of each atomizing nozzle can be set according to the needs to obtain the required smoke and dust collection effect; in order to ensure that the sprayed water atomization effect is better, this embodiment Among them, the pressures of compressed air and water are both 0.4-0.6MPa, and the effect of controlling the particle size of atomized water particles to ≤40μm is better (it can be realized by the selection of atomizing nozzles). Further preferably, each of the atomizing nozzles is a dry fog nozzle, that is, the particle size of the atomized water particles is controlled between 2.5 μm and 10 μm, and the effect is better.

The above-mentioned aerosol ring pipe 21 can be arranged coaxially with the compressed air ring pipe 23, can be arranged on the same horizontal plane, and can also be arranged on a staggered plane up and down. The mist ring pipe 21 can be lifted up and down, so as to adjust the height of the aerosol ring pipe 21 according to the production process of the desulfurization station, such as avoiding affecting the lifting operation of the stirring head 3, or driving the aerosol during the stirring operation, tilting and slag removal of the molten iron tank 4, etc. The ring pipe 21 is raised to an appropriate height, so as to play the role of optimal flue gas cooling and purification and trapping. As a preferred structure of this embodiment, the above-mentioned compressed air ring pipe 23 and the gas mist ring pipe 21 are preferably connected together coaxially. Specifically, the following method is adopted: as shown in Figure 2, the dust removal device of the above-mentioned molten iron desulfurization station includes a ring part Pipe 200, the distribution pipe 200 is sleeved outside the dust cover 1, and the distribution pipe 200 is provided with an annular partition 22, and the annular partition 22 is vertically arranged and divides the distribution pipe 200 It is an outer ring half-pipe body and an inner ring half-pipe body, the outer ring half-pipe body is located on the side of the annular partition 22 away from the dust cover 1, and the annular partition 22 and the outer ring half-pipe The compressed air annular pipe 23 is formed by splicing the pipe bodies, and the aerosol annular pipe 21 is formed by splicing the annular partition plate 22 and the half-pipe body of the inner ring. That is, the annular partition 22 divides the lumen of the distribution pipe 200 into two coaxial annular cavity parts, and the annular cavity part far away from the dust removal cover 1 constitutes the lumen of the compressed air ring pipe 23, forming a nozzle to each compressed air nozzle. 231 is a compressed air flow channel for supplying compressed air, and the annular cavity part near the dust removal cover 1 constitutes the lumen of the aerosol ring pipe 21, forming an aerosol fluid flow channel for supplying aerosol fluid to each atomizing nozzle. Combining the compressed air ring pipe 23 and the aerosol ring pipe 21 has a simple structure, takes up little space, and is convenient for installation, arrangement and management of equipment. At the same time, since both the compressed air nozzle 231 and the atomizing nozzle need to supply compressed air, in this embodiment, the following preferred structure is adopted:

The aerosol source supply pipe includes a compressed air branch pipe and a water branch pipe. The compressed air branch pipe is connected to the compressed air supply pipe. A second control valve and a third control valve are arranged on the top, and the second control valve and the third control valve are respectively arranged on both sides of the side connection point of the compressed air branch pipe along the air flow direction. By controlling the compressed air flow into the compressed air branch pipe and the compressed air supply pipe through the first control valve, the second control valve and the third control valve, it can be ensured that the operation between each compressed air nozzle 231 and the atomizing nozzle does not affect each other. The above structure enables the device to supply compressed air through the same set of compressed air source, which simplifies the equipment structure, reduces the energy consumption of the equipment, and facilitates centralized management. Further, in this embodiment, the compressed air supply pipe is connected with a centrifugal fan, and the compressed air is supplied through the centrifugal fan. Usually, the processing cycle of the hot metal desulfurization station is 40 minutes, and the working time of the dust removal system for stirring and slag removal is about 20 minutes. Therefore, preferably, the drive motor of the centrifugal fan is a variable frequency motor, which can save energy and reduce consumption.

To further optimize the structure of the above-mentioned dust removal device, the compressed air ring pipe 23 is connected with a lift drive mechanism that drives it to lift vertically. The height of the compressed air ring pipe 23 can be adjusted according to the production process of the desulfurization station, such as to avoid affecting the lifting operation of the stirring head 3, or to drive the compressed air ring pipe 23 to an appropriate height during the stirring operation, the tilting of the molten iron tank 4, and slag removal. , in order to achieve the best air curtain dust sealing effect. Above-mentioned lifting driving mechanism can adopt existing lifting driving equipment, as can be provided with lifting pulley on the factory building top and connect compressed air ring pipe 23 by this lifting pulley; A bracket is arranged on the frame and a lifting cylinder is installed. The output shaft axis of the lifting cylinder is along the vertical direction, and the compressed air ring pipe 23 is connected to the output shaft of the lifting cylinder; , Compressed air ring pipe 23 can also be set to follow-up connection with dust removal cover 1.

Further optimize the structure of the above-mentioned dust removal device. Along the circumferential direction of the distribution pipe 200, there is at least one compressed air nozzle 231 between every two adjacent atomizing nozzles. The number of atomizing nozzles can be determined according to the on-site process conditions and Flue gas purification requirements and other factors are reasonably selected. Generally, the mist nozzles 211 and compressed air nozzles 231 are arranged at a dislocation interval, that is, along the radial direction of the distribution pipe 200, the gas mist nozzles 211 and the adjacent compressed air nozzles 231 are not located. On the same radial line, it is possible to avoid the waste of resources caused by overlapping dust removal functions between the compressed air nozzle 231 and the atomizing nozzle. In this embodiment, the ratio of the number of aerosol nozzles 211 to compressed air nozzles 231 is between 1:2 and 1:4, correspondingly, there are 2 to 4 compressed air nozzles 231 between every two adjacent aerosol nozzles 211 .

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in the Within the protection scope of the present utility model.

Claims (8)

1. A dedusting device for a molten iron desulfurization station, comprising a dedusting cover, characterized in that: it also includes a compressed air ring pipe sleeved outside the dust removal cover, the compressed air ring pipe is connected with a compressed air supply pipe, the compressed air The bottom of the air ring pipe is provided with a plurality of compressed air nozzles, and each of the compressed air nozzles is arranged around the dust cover and communicates with the inner cavity of the compressed air ring pipe. 2. The dedusting device of molten iron desulfurization station according to claim 1, characterized in that: it also includes an aerosol ring pipe sleeved outside the dust removal cover, and the aerosol ring pipe is connected with an aerosol source supply pipe, so that The gas mist ring pipe is provided with a plurality of atomizing nozzles, each of the atomization nozzles is arranged around the dust removal cover and the inlet end is connected with the inner cavity of the gas mist ring pipe; The projection of the aerosol annular pipe on the horizontal plane is located within the projection range of the compressed air annular pipe on the horizontal plane. 3. The dedusting device of molten iron desulfurization station according to claim 2, characterized in that it comprises an annular distribution pipe, the distribution pipe is sleeved outside the dust cover, an annular partition is arranged inside the distribution pipe, and the annular The partition is arranged vertically and divides the distribution pipe body into an outer ring half-pipe body and an inner ring half-pipe body, the outer ring half-pipe body is located on the side of the annular partition far away from the dust removal hood, The annular baffle is spliced with the outer ring half-pipe to form the compressed air ring, and the annular baffle is spliced with the inner ring half-pipe to form the aerosol ring. 4. The dedusting device of the hot metal desulfurization station according to claim 3, characterized in that: along the circumferential direction of the distribution pipe, there is at least one compressed air nozzle between every two adjacent atomizing nozzles. 5. The dedusting device of molten iron desulfurization station according to claim 3, characterized in that: said aerosol source supply pipe comprises a compressed air branch pipe and a water branch pipe, and said compressed air branch pipe is next to said compressed air supply pipe, The compressed air branch pipe is provided with a first control valve, and the compressed air supply pipe is provided with a second control valve and a third control valve. Along the air flow direction, the second control valve is separated from the third control valve. Listed on both sides of the compressed air branch side connection point. 6. The dedusting device of the hot metal desulfurization station according to any one of claims 2 to 5, wherein each of the atomizing nozzles is a dry fog nozzle. 7. The dedusting device of the hot metal desulfurization station according to any one of claims 1 to 4, characterized in that: the compressed air ring pipe is connected with a lifting drive mechanism to drive it vertically. 8. The dedusting device of the hot metal desulfurization station according to claim 1 or 5, characterized in that: said compressed air supply pipe is connected with a centrifugal fan, and the driving motor of said centrifugal fan is a variable frequency motor.