CN211216015U - Dust removal and dehumidification device for treating waste gas in slag treatment - Google Patents
Dust removal and dehumidification device for treating waste gas in slag treatment Download PDFInfo
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- CN211216015U CN211216015U CN201921696701.8U CN201921696701U CN211216015U CN 211216015 U CN211216015 U CN 211216015U CN 201921696701 U CN201921696701 U CN 201921696701U CN 211216015 U CN211216015 U CN 211216015U
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Abstract
The utility model discloses a slag treatment waste gas is administered and is used dust removal dehydrating unit belongs to metallurgical industry's environment dust removal technical field, including cyclone, connecting tube, filter tower, nozzle etc.. The dust-containing wet waste gas generated in the slag treatment process of the steelmaking unit passes through the cyclone dust collector to achieve the effects of coarse dust removal and dehydration, is guided into the filter tower through the connecting pipeline, passes through the filter tower again to achieve the effects of fine dust removal and demisting, and is discharged to the high-altitude atmosphere through the fan and the exhaust funnel. Dust in a dust collecting hopper of the cyclone dust collector is discharged from a bottom dust discharging port, the dust intercepted by a filter layer of the filter tower is periodically washed by high-pressure water, and the fluidized sewage is discharged from a water discharging port and then is connected to a turbid circulating water treatment system. Coarse dust removal is combined with secondary dust removal through primary cycloneThe dust-containing and moisture-containing waste gas generated in the slag treatment process is treated by fine filtration and dust removal, and the dust-containing concentration of the waste gas can be controlled from 100-2000 mg/Nm3Reduced to less than or equal to 30mg/Nm3And avoid the exhaust funnel from emitting 'white smoke' caused by adopting wet dust removal.
Description
Technical Field
The utility model belongs to the technical field of the environment dust removal of metallurgical industry, concretely relates to sediment is handled waste gas and is administered with dust removal dehydrating unit.
Background
During the slag treatment process (such as roller slag, stewing slag and splashing slag) in the steel refining process, a large amount of water is generatedThe dust concentration of the waste gas of steam and dust is 100-2000 mg/Nm3The direct discharge into the air can cause serious pollution to the workplace and the atmospheric environment; in addition, the country sets up relevant environmental policies that restrict the emission of exhaust pollutants. In order to make the discharged waste gas reach the required discharge standard, the waste gas needs to be purified. Thus, each plant is equipped with an associated flue gas dust removal device.
The prior known smelting steel slag treatment method comprises the following steps: a cold leaving method, a hot pouring method, a box-type hot pouring method, a water quenching method, a wind crushing method, a hot-seal tank method, a roller method and the like. Wherein, the roller method, the hot-disintegration method, the water quenching method and the wind crushing method all belong to the wet treatment range of cooling the steel slag by a large amount of water; the water consumption of the cold disposal method, the hot splashing method, the box type hot splashing method and the hot tank sealing method is reduced by about half compared with the water consumption of the wet method treatment, and the method belongs to the treatment range of the semidry method. Regardless of a wet method or a semi-dry method, a cooling medium is water, waste gas containing water vapor and dust is generated in the slag treatment process, a dust removal system of the slag treatment process mainly adopts a wet method process, namely a spraying and dewatering mode, such as CN103924010B, CN103920354B and CN105749686A, the wet method dust removal process needs to consume a large amount of water resources, the occupied area and the investment of a turbid circulating water treatment system are increased, and the phenomenon that an exhaust funnel emits white smoke is generated to different degrees.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a simple structure, economical and practical's sediment is handled waste gas and is administered and use dust removal dehydrating unit for solve the situation of sediment processing waste gas polluted environment.
The utility model discloses a realize through following technical scheme:
the utility model provides a pair of waste gas is handled to sediment is administered and is used dust removal dehydrating unit, including the cyclone that is used for receiving the dust-laden wet waste gas that steelmaking unit sediment processing procedure produced and pass through the filter tower that the connecting tube switched on with cyclone, be equipped with the filter layer in the barrel of filter tower, on the barrel and lie in the filter layer both sides respectively be equipped with be used for washing the nozzle of filter layer top and bottom, be used for the outlet of the sparge water of water conservancy diversion play filter layer top and bottom, air inlet and gas outlet on the barrel set up from top to bottom according to the flow state of waste gas in the filter tower, and air inlet and gas outlet arrange for the filter layer opposite side, the gas outlet is higher than the outlet.
By adopting the scheme, dust-containing wet waste gas generated in the slag treatment process of the steelmaking unit sequentially passes through the inlet pipe, the outer barrel, the inner barrel and the outlet pipe of the cyclone dust collector, is guided into the filter tower by the connecting pipeline after reaching the effects of coarse dust removal and dehydration, and is discharged to the high-altitude atmosphere by the fan and the exhaust funnel after sequentially passing through the inlet pipe, the barrel, the filter layer and the outlet pipe of the filter tower and reaching the effects of fine dust removal and defogging. Meanwhile, dust in the dust collecting hopper of the cyclone dust collector is discharged from the bottom dust discharging port and is bagged and transported outside, dust intercepted by the filter layer of the filter tower is periodically washed at high pressure by using a nozzle, and fluidized sewage is discharged from the water discharging port and then can be connected to a turbid circulating water treatment system of a slag treatment facility of a steelmaking unit, so that the dust removing and dehumidifying device does not need to be independently constructed into the turbid circulating water treatment system. In addition, the filter tower is used for feeding air from the top and discharging air from the middle lower part, so that compared with a mode of feeding air from the lower part and discharging air from the top, connecting pipelines and occupied land are saved, and the overall arrangement structure is compact.
Furthermore, the filter layer is obliquely arranged in the cylinder, and is made of stainless steel or plastic by using a wire mesh or a filler. The net flow rate of a filter layer of the filter tower is about 4m/s, the thickness of the filter layer is about 100mm, the porosity is 80-95%, the running resistance loss of a single-layer filter layer is controlled to be less than or equal to 1.0kPa, and fine dust removal and filtration are facilitated. The filter layer keeps a slope not less than 0.05 and slopes to the water outlet at the upper part of the cylinder body, and sewage is simultaneously discharged from the two water outlets at the upper part and the lower part during washing, so that the washing is facilitated.
Further, the filter layer sets up 1 ~ 2 layers along the barrel direction of height, and the filter layer aperture of air current low reaches is less than the filter layer aperture of air current upper reaches, realizes the hierarchical filtration and the purification of dusty waste gas.
Furthermore, the nozzle adopts a solid cone spiral nozzle, and the medium flowing into the nozzle is purified turbid circulating water. The height difference between the nozzles and the filtering layer is about 1m, 3-5 nozzles are arranged along the circumferential direction of the cylinder, the nozzles are arranged at the upstream and the downstream of the airflow of the filtering layer, and the flushing and sewage discharging effects are good. The solid cone spiral nozzle has the characteristics of uniform spraying and difficult blockage, the medium is turbid circulating water purified by a turbid circulating water treatment system of the slag treatment facility of the steelmaking unit, the water pressure is not less than 1.5MPa, the flushing time is 3-5 min each time, the flushing is carried out intermittently, and the water resource can be reasonably utilized.
Further, the lower section of the barrel is set to be a cone hopper body, the water outlet below the filter layer is positioned at the outlet of the cone hopper body, and the bottom of the cone hopper body is provided with a vibrator. Therefore, the cone body structure can facilitate sewage collection and discharge, and the design of the vibrator can be beneficial to conveying of the dust-containing flow state in the sewage.
Furthermore, the connecting pipeline is a uniform air supply pipe, and a converging structure is adopted along the airflow direction, so that the airflow is uniformly distributed to the cylinders.
Further, an air mixing valve used for air to enter the cylinder body is arranged on the cylinder body and between the air outlet and the filter layer. The negative pressure in the cylinder and the opening state of the air mixing valve are utilized to automatically suck air from the outside into the downstream of the filter layer in the cylinder, and the mixing of waste gas and air is completed in the cylinder, so that the partial pressure and the relative humidity of the water vapor are reduced, the saturated state is changed into the unsaturated state, the corrosion to downstream equipment and pipelines is reduced, and the direct discharge of the exhaust funnel is facilitated.
Further, the number of the cylinders of the filter tower is 2-5, and a single cylinder is communicated with the connecting pipeline through a switching valve. The filter tower adopts a multi-cylinder structure, wherein when one cylinder is in a dust washing state, other cylinders are in a waste gas filtering state.
The utility model has the advantages that:
1. the utility model discloses the device adopts the mode that the coarse dust removal of one-level whirlwind combines the fine dust removal of secondary filter, is used for administering the dusty wet waste gas that contains that the sediment processing procedure produced, is approximate to dry process dust removal technology, only consumes a small amount of sparge water, compares with wet process dust removal technology, can avoid adopting wet process dust removal to lead to the aiutage to emit "white smoke".
2. The device can treat the slag with dense dust in the waste gasThe degree of the reaction is from 100 to 2000mg/Nm3Reduced to less than or equal to 30mg/Nm3Has the advantages of simple structure, economy and practicality.
3. The utility model discloses the device is at first through the large granule machinery water in the cyclone desorption waste gas, and the fine particle water smoke in the filter layer desorption waste gas of rethread filter tower reduces its relative humidity through mixing the wind at last, reaches waste gas dehumidification emission purpose.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.
Drawings
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic structural view of the multi-drum filtration tower of the apparatus of the present invention;
FIG. 2 is a schematic structural view of the single-tube filtration tower of the apparatus of the present invention;
description of the labeling: the device comprises a cyclone dust collector 1, a connecting pipeline 2, a filter tower 3, a nozzle 4, a water outlet 5 and a switching valve 6; an inlet pipe 11, an outer cylinder 12, an inner cylinder 13, an ash collecting hopper 14, an ash discharging opening 15, an outlet pipe 16 and a bracket 17; the air inlet 31, the cylinder 32, the filter layer 33, the air outlet 34, the cone body 35, the support 36 and the air mixing valve 37; an upstream flushing nozzle 41, a downstream flushing nozzle 42; an upper drain opening 51 and a lower drain opening 52.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the features in the following embodiments and examples may be combined with each other without conflict.
The first embodiment is as follows:
as shown in figure 1, the utility model provides a dust removal and dehumidification device for treating waste gas in slag treatment, which comprises a cyclone dust collector 1, a connecting pipeline 2, a filter tower 3, a nozzle 4, a water outlet 5, a switching valve 6 and the like. In the embodiment, dust-containing and wet-containing waste gas generated in the slag treatment process of the steelmaking unit sequentially passes through an inlet pipe 11, an outer cylinder 12, an inner cylinder 13 and an outlet pipe 16 of a cyclone dust collector 1 to achieve the effects of coarse dust removal and dehydration, the outer cylinder is arranged on a support 17 and is guided into a filter tower 3 through a connecting pipeline 2, the waste gas sequentially passes through an air inlet 31, a cylinder 32, a filter layer 33 and an air outlet 34 of the filter tower to achieve the effects of fine dust removal and defogging, the cylinder is arranged on a support 36, and finally, the waste gas is discharged to the high-altitude atmosphere through a fan and an. The dust in the dust collecting hopper 14 of the cyclone dust collector is discharged from the bottom dust discharging port 15, bagged and transported outside, the dust intercepted by the filter layer 33 of the filter tower is periodically washed by high-pressure water sprayed by the nozzle 4, the fluidized sewage is discharged from the water discharging port 5 and then can be connected to a turbid circulating water treatment system of the slag treatment facility, and the water discharging port 5 comprises an upper water discharging port 51 above the filter layer and a lower water discharging port 52 below the filter layer. Meanwhile, the filter tower 3 is of a multi-cylinder structure, a single cylinder is communicated with the connecting pipeline through the switching valve 6, and when one cylinder is in a dust washing state, other cylinders are in a waste gas filtering state. The filter tower 3 also adopts a mode of top air inlet and bottom air outlet, and compared with the mode of bottom air inlet and top air outlet, the filter tower saves connecting pipelines and occupied land, and has compact overall arrangement structure. The net flow rate of a filter layer 33 of the filter tower is about 4m/s, the filter layer can be made of stainless steel or plastic by selecting a wire mesh or filler according to needs, the thickness of the filter layer is about 100mm, the operation resistance loss of a single-layer filter layer is controlled to be less than or equal to 1.0kPa, the filter layer keeps a slope not less than 0.05 and is inclined towards a water outlet at the upper part of the cylinder body, and sewage is simultaneously discharged from the two water outlets at the upper part and the lower part during washing.
The height difference between the nozzles 4 and the filter layer 33 in this embodiment is about 1m, 3-5 nozzles are arranged along the circumferential direction of the cylinder, and upstream flushing nozzles 41 and downstream flushing nozzles 42 are arranged in the upstream and downstream of the airflow of the filter layer. And the nozzle adopts a solid cone spiral nozzle, the medium is purified turbid circulating water, the water pressure is more than or equal to 1.5MPa, and the washing is carried out intermittently.
The lower section of the cylinder body in the embodiment is set to be a cone hopper body, the water outlet below the filter layer is positioned at the outlet of the cone hopper body, and the bottom of the cone hopper body is provided with a vibrator. Therefore, the cone body structure can facilitate sewage collection and discharge, and the design of the vibrator can be beneficial to conveying of the dust-containing flow state in the sewage. Of course, in different embodiments, as shown in fig. 2, a funnel with a cone-shaped structure can be arranged at the lower part of the cylinder body and connected with the lower water outlet 52 through a pipeline, and the aim can also be achieved.
The connecting pipeline in this embodiment is a uniform air supply pipe, and a converging structure is adopted in the air flow direction, so that the air flow is uniformly distributed to the cylinders. In addition, according to the process arrangement requirement, the outlet pipe of the cyclone dust collector is higher than the air inlet of the filter tower, and the connecting pipeline is obliquely arranged, so that dust and moisture in the waste gas are conveniently settled in the connecting pipeline and uniformly discharged after entering the filter tower.
In this embodiment, a mixing valve for air to enter the cylinder is arranged on the cylinder and between the air outlet and the filter layer. The opening of the air mixing valve is controllable, and under the condition of not additionally adding other auxiliary equipment, air can be automatically sucked into the downstream of the filter layer in the cylinder from the outside by utilizing the negative pressure effect in the cylinder and the opening state of the air mixing valve, so that the mixing of waste gas and air is completed in the cylinder, the water vapor partial pressure and the relative humidity of the air mixing valve are reduced, the air mixing valve is changed from a saturated state to an unsaturated state, the corrosion to downstream equipment and pipelines is reduced, and the direct discharge of an exhaust funnel is facilitated.
This embodiment slag treatment waste gas is administered and is used dust removal dehumidification mode, and the concrete process includes: firstly, collecting dust-containing and moisture-containing waste gas generated in the slag treatment process of a steelmaking unit; then, sequentially carrying out primary cyclone coarse dust removal and secondary filtration fine dust removal on the collected dust-containing wet waste gas; and the barrel body is switched to be controlled according to the flushing time interval of each barrel body of the filter tower in the secondary filtration fine dust removal. Namely: collecting dust-containing wet waste gas generated in the slag treatment process of the steelmaking unit, leading the dust-containing wet waste gas into a filter tower through a cyclone dust collector after achieving the effects of coarse dust removal and dehydration, and leading the dust-containing wet waste gas into the filter tower through a connecting pipeline, wherein under the filtration of a plurality of cylinders of the filter tower, the washing time interval of a single cylinder is used as the main basis for switching the cylinders to be subjected to main control, for example, corresponding switching valves of the cylinders are sequentially closed for 10-20 min and then opened (the washing time is 3-5 min) according to the arrangement sequence of the cylinders, when one cylinder is in a dust washing state, other cylinders are in a waste gas filtering state, the cylinders are circularly and alternately washed, and after the dust removal and defogging effects are achieved through the filter tower, the dust-containing wet waste. And can also obtain the pressure of the filter layer both sides of each barrel to according to the pressure differential value of the filter layer both sides pressure that obtains to the barrel switches and assists the control. Namely: and pressure transmitters are arranged on two sides of the filter layer to feed the pressure difference between the two sides of the filter layer back to the control system. The pressure difference between the two sides of the filter layer is used as an auxiliary control means, and the time interval for opening and closing the switching valve is adjusted, so that the pressure difference between the two sides of the filter layer is always kept not more than the design value of 1.0kPa, and the treatment effect and efficiency of the device can be improved.
Example two:
as shown in fig. 2, the present embodiment is different from the first embodiment in that: the filter tower 3 is of a single-cylinder structure, so that the waste gas is filtered during slag treatment and operation, the dust is washed in a production gap, and an automatic switching valve is not needed. The embodiment has simple structure and less occupied area. In the operation process of the system, when the amount of dust intercepted by the filter layer is gradually increased, the operation resistance is continuously increased, the filter layer needs to be frequently washed by utilizing a production gap, the filter layer is washed once per hour, and the washing time is 3-5 min each time.
In order to improve the filtering effect of the single cylinder of the filtering tower, two filtering layers can be arranged along the height direction of the cylinder, the aperture of the filtering layer at the downstream of the airflow is smaller than that of the filtering layer at the upstream of the airflow, and the classified filtration and purification of the dust-containing waste gas are realized.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and it is obvious that those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. The utility model provides a sediment is handled waste gas and is administered dust removal dehydrating unit, its characterized in that, including cyclone (1) and the filter tower (3) that leads to through connecting tube (2) with cyclone that are used for receiving the dust-laden wet waste gas that steelmaking unit sediment processing produced, be equipped with filter layer (33) in the barrel (32) of filter tower, on the barrel and lie in the filter layer both sides respectively be equipped with be used for washing nozzle (4) below the filter layer, be used for the outlet of water (5) of the washing water below the filter layer of water diversion, air inlet (31) and gas outlet (34) on the barrel set up from top to bottom according to the flow state of waste gas in the filter tower, and air inlet and gas outlet arrange for the filter layer opposite side, the gas outlet is higher than the outlet of filter layer below.
2. The dust-removing and dehumidifying device for treating slag-treated waste gas of claim 1, wherein the filter layer is obliquely arranged in the cylinder, and is made of stainless steel or plastic by using a wire mesh or a filler.
3. The dust-removing and dehumidifying device for treating slag-treated waste gas according to claim 1, wherein the filter layers are provided in 1 to 2 layers in the height direction of the cylinder, and the pore size of the filter layer on the downstream side of the gas flow is smaller than the pore size of the filter layer on the upstream side of the gas flow.
4. The dust-removing and dehumidifying device for treating slag-treating waste gas of claim 1 wherein the nozzle is a solid cone spiral nozzle, and the medium in the nozzle is purified turbid circulating water.
5. The dust-removing and dehumidifying device for treating slag-treating waste gas of claim 1, wherein a cone-shaped hopper body (35) is arranged at the lower section of the cylinder body, a water outlet below the filter layer is positioned at an outlet of the cone-shaped hopper body, and a vibrator is arranged at the bottom of the cone-shaped hopper body.
6. The dust-removing and dehumidifying device for treating slag-treating exhaust gas of claim 1, wherein the connecting pipe is a uniform blowing pipe, and a converging structure is adopted in the gas flow direction.
7. The dust-removing and dehumidifying device for treating slag-treating waste gas according to claim 1, wherein an air mixing valve (37) for allowing air to enter the cylinder is provided on the cylinder between the air outlet and the filter layer.
8. The dust removal and dehumidification device for treating slag treatment waste gas according to any one of claims 1 to 7, wherein the number of the filter tower cylinders is 2 to 5, and a single cylinder is communicated with the connecting pipeline through a switching valve (6).
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| CN201921696701.8U CN211216015U (en) | 2019-10-11 | 2019-10-11 | Dust removal and dehumidification device for treating waste gas in slag treatment |
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| CN201921696701.8U CN211216015U (en) | 2019-10-11 | 2019-10-11 | Dust removal and dehumidification device for treating waste gas in slag treatment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110585842A (en) * | 2019-10-11 | 2019-12-20 | 中冶赛迪工程技术股份有限公司 | Dust removal and dehumidification device and method for treating slag treatment waste gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110585842A (en) * | 2019-10-11 | 2019-12-20 | 中冶赛迪工程技术股份有限公司 | Dust removal and dehumidification device and method for treating slag treatment waste gas |
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