CN101578128A - Method and apparatus for filtering process gas - Google Patents
Method and apparatus for filtering process gas Download PDFInfo
- Publication number
- CN101578128A CN101578128A CNA2007800472797A CN200780047279A CN101578128A CN 101578128 A CN101578128 A CN 101578128A CN A2007800472797 A CNA2007800472797 A CN A2007800472797A CN 200780047279 A CN200780047279 A CN 200780047279A CN 101578128 A CN101578128 A CN 101578128A
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- China
- Prior art keywords
- gas
- chamber
- filter chamber
- discharge
- discharge tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000001914 filtration Methods 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 44
- 239000007789 gas Substances 0.000 claims abstract description 105
- 239000007787 solid Substances 0.000 claims abstract description 49
- 239000011261 inert gas Substances 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 239000011343 solid material Substances 0.000 claims abstract description 11
- 229910001021 Ferroalloy Inorganic materials 0.000 claims abstract description 9
- 238000005272 metallurgy Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 abstract description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 238000003723 Smelting Methods 0.000 abstract description 2
- 239000002002 slurry Substances 0.000 abstract description 2
- 238000007664 blowing Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 238000004140 cleaning Methods 0.000 description 7
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 238000007499 fusion processing Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000010309 melting process Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
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- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
The invention relates to a method and an apparatus for filtering process gas created in the ferroalloy smelting process, i.e. carbon monoxide gas, in order to essentially reduce the content of solids in the gas. In the filtering unit (24) gas containing solids is conducted through at least one filtering element (7), inert gas blowing (8) is directed to the filtering element (7) in order to detach the solid material from the surface of the filtering element (7), and in order to remove from the filtering unit (24) the solid material detached from the surface of the filtering element (7) the solid material is slurried by means of liquid fed (11) into the filtering unit (24). The slurry containing the sold material is removed from the filtering unit (24) through a discharge chamber (12). The filtering unit (24) includes a filtering chamber (1) and a discharge chamber (12) that is mechanically connected to the filtering chamber, as well as a discharge conduit (6) for the solids filtered from the gas, and the filtering chamber (1) is provided with at least one filtering element (7) for separating solids from the gas and at least one nozzle (8, 11) for discharging the filtered solids from the filtering chamber (1).
Description
Technical field
The present invention relates to be used for to the process gas that the ferroalloy metallurgy process generates is that CO gas filters so that reduce the method and apparatus of the contained amount of solids of gas basically.
Background technology
For the waste gas that generates in the Metal Melting process of cleaning solid, for example, generally use Venturi scrubber in order to clean the gas that generates in the ferroalloy metallurgy process.The gas that has solid that cleans imports in the Venturi scrubber through the top of this Venturi scrubber, and water jet is sprayed onto on the air-flow that flows downward.Because the cause of this water jet, the contained solid of gas is washed in the water, and the discharge orifice of the gas that cleaned on the Venturi scrubber top is directed leaving this Venturi scrubber.In order to improve the solid separating power of Venturi scrubber, two or more Venturi scrubbers that can be installed in series are so that the gas that will clean flows through all these scrubbers.But, even this method also can only obtain 50-200mg/Nm
3Purity, in each various process step of ferroalloy production or will to use this this purity under the situation of purge gas without a doubt according to other occasion of required purpose be not enough.
In addition, when processing procedure gas is for example handled the CO gas that generates in the ferroalloy metallurgy process, it should be noted that also such CO gas is dangerous.Therefore, when handling CO gas, must consider the safety requirements of work and external environment modestly, so that must not there be CO gas to select in the extraneous working space basically.
Summary of the invention
The objective of the invention is to eliminate the shortcoming of prior art, and to being that the method and apparatus of removing solid in the CO gas that generates the ferroalloy metallurgy process makes improvements from process gas, thereby can advantageously adopt this process gas for example to be used for heating in the process steps before fusion process and/or behind the fusion process.Essential novel features accessory rights of the present invention will be understood in requiring.
The method and apparatus that is used for cleaning process gas according to the present invention and is the CO gas that the ferroalloy metallurgy process generates preferably at first has at least one such scrubber on airflow direction, wherein, the most handy liquid medium carries out separating of gas and solid.Process gas after the cleaning is that CO gas further is directed at least one gas filtration unit, wherein, filters and carries out with the dry method separate mode.When needing, between this scrubber and the gas filtration unit gas blower can be installed, in this case, can improve the specific gas flow rate between scrubber and the filter element.
In device according to the present invention, the gas filtration unit is made of the filter chamber that the preferred rounded basically and shape of cross section is cylinder basically.Can advantageously be provided with a conical lower section in the filter chamber of gas filtration unit.Thereby this gas filtration unit is also done compactly.On process gas flows direction, at first end of this cylindrical element or first end of close this cylindrical element the conduit that is used for gas to be processed is supplied to the filter chamber is installed, the conduit that is used for gas is discharged the filter chamber is installed at the other end of cylindrical element or the other end of close this cylindrical element.The advantageously vertical basically installation in filter chamber, in this case, bottom, filter chamber or the bottom that is connected with the bottom, filter chamber also are formed with the discharge orifice that is used for discharging the solid that separates from gas.The cross section of filter chamber also can be rectangle basically or be for example oval according to the present invention.
According to the present invention, some filtration members are installed advantageously in the filter chamber.If the quantity of process gas basically seldom, also a filtration members can only be installed in the filter chamber, but with regard to the installation and maintenance filtration members, more advantageously be in the filter chamber, to use some filtration members.Filtration members is mounted in the filter chamber and makes filtration members roughly cover the entire cross section of filter chamber, or advantageously is that part of cross section that gas to be processed is directed to outlet opening institute warp in the covering filter chamber from filter chamber's inlet hole at least.The porous material that the most handy gas that will clean of filtration members can flow through, plastics or other this type of material for example ceramic material are made.Like this, solid material contained in the gas can be separated from the gas, and this is owing to prevented the solid by filtration part.Filtration members also available metal is made.
In addition, filter chamber according to the present invention in the filter element is provided with inert gas conduit and liquid medium conduit, the inert gas that is used for the cleaning and filtering part for example nitrogen is carried by this inert gas conduit, be used for liquid medium that the solid that separates from filtration members is removed from the filter chamber for example water be transported to the filter chamber through this liquid medium conduit.At the two ends that are connected with the filter chamber, inert gas conduit and liquid medium conduit are equipped with at least one nozzle, utilize this nozzle can guide the material that will supply in a predetermined direction.Therefore, the processing part of solid in the filter chamber is that dry method is separated, a part is a wet separation.The nozzle of supplying inert gas is bonded at the lip-deep solid of filtration members towards filtration members to remove.Be used to carry the conduit of the gas of cleaning and filtering part to be provided with control module, utilize this control module can regulate the duration or the intensity of one air-flow that for example flows through this conduit and the frequency that blows the cycle.
Be used for be bonded on the filtration members solid from the liquid medium of filter chamber discharging for example water advantageously use nozzle to guide, so that when using plurality of nozzles, at least a portion nozzle preferred orientation become to make the liquid medium that flows through these nozzles be used for separating solids on filtration members, the filtration members wall, and a part of nozzle is used for removing solid from the free space of filtration members.In the cycle that repeats, remove solid continuously or preferably with this liquid medium.The mud that constitutes by liquid medium with from the solid that gas separates through forming in the bottom, filter chamber the mud emission hole or with bottom that the filter chamber is connected the discharge filter chamber, mud emission hole that forms.
This solid discharge hole in the filter chamber is with discharge tube, preferably delivery pipe is connected; On the solid flow direction, basically near the just close end place that is connected with the filter chamber of first end of discharge tube, this discharge tube is provided with two obstruction piece, and one of them obstruction piece next-door neighbour discharge orifice is installed, and another obstruction piece is installed with a certain distance from first obstruction piece.Remaining space formation solids discharge chamber between two obstruction piece in the discharge tube.This drain chamber also can be the separate part that separates with discharge tube, be provided with two obstruction piece, and in this case, discharge tube is connected with drain chamber.Like this, drain chamber is connected with the solid discharge hole of filter chamber on the one hand, be connected with discharge tube on the other hand, thereby the joint portion of the discharge orifice of filter chamber and discharge tube is equipped with obstruction piece.The obstruction piece alternating movement, when the CO gas that will clean with box lunch flow through the filter chamber, at least one obstruction piece was always closed.By this obstruction piece of closing, prevented that CO gas from flowing to discharge tube or flow to the discharge tube and drain chamber position in succession from drain chamber, and prevented that from then on CO gas from flowing to extraneous space.Discharge tube advantageously is designed to can form for example water seal of a fluid-tight in discharge tube.Discharge tube also can be formed with a fluid-tight for example the parts of water seal be connected.Use this fluid-tight, prevented that preferably the gaseous state carbon monoxide from entering in the extraneous space.
The work of the obstruction piece of the supply of liquid medium and formation drain chamber is in the method according to the invention advantageously by also being used to control the same control module adjusting that inert gas is supplied to the filter chamber.But the also available independent control unit of the work of the supply of inert gas and liquid medium and drain chamber obstruction piece is regulated.
When apparatus of the present invention are used the inventive method work, obtain and the gas that contains the waste gas of being with solid is that CO gas is first directed in the Venturi scrubber and cleans by the Metal Melting process, in this scrubber, water jet is directed to the air-flow that flows downward.Because this water jet, a part of solid contained in the CO gas is scavenged into the scrubber bottom along current, and gas upwards flows towards steam vent.Gas pressure according to the CO gas that flows out scrubber, CO gas or directly be directed to filter element or be directed to gas blower earlier, in this air blast, by before entering filter element, carrying out the pressure that air blast can increase CO gas.At least at the gas pressure of discharging from scrubber with respect to the pressure loss that filter element, takes place when not enough, it is significant using air blast.
The CO gas that filters flows to the filtration members that is located in the filter chamber by the inlet hole of the filter chamber of filter element, in this case, contained solid material is blocked on the filtration members surface in the gas, and the gas itself after cleaning continues to flow through filtration members.For the cleaning and filtering part, filtration members is carried out nitrogen injection, its duration, pressure and period frequency are regulated by a control module.Water is conveyed in the filter element by the nozzle of installing in the filter element, is used for the solid material that breaks away from from filtration members is sent to the filter element bottom.Basically in water supply start, on the flow direction of discharge orifice, first obstruction piece is opened in the bottom, filter chamber, with being discharged to the solids discharge chamber from the filter chamber by water and the mud that constitutes from the solid that filtration members is removed.When water supply stopped, first obstruction piece that is used to discharge on the discharge orifice flow direction of mud was closed.
For drain chamber is left in the guiding of mud contained in the drain chamber, second obstruction piece that is used to remove on the discharge orifice flow direction of mud is opened, thereby makes mud flow to that part of after the drain chamber of being positioned at of discharge tube.Discharge tube is designed so that advantageously slurry flows crosses a water seal that forms in the discharge tube, is for further processing after flowing through.Therefore, remove the CO gas that to carry secretly with mud before can the extraneous free space after mud flows to discharge tube.
Because the process gas that filters according to the inventive method and device is a CO gas, and a small amount of carbon monoxide also is breakneck, filter therefore that to prevent in the CO gas process that this gas from entering extraneous free space extremely important.
When using apparatus of the present invention, solids content is less than 5mg/Nm in the CO gas of filtration back
3, preferably be less than 1mg/Nm
3
Description of drawings
Describe the present invention with reference to the accompanying drawings in detail, in the accompanying drawing:
Fig. 1 is the side view of filter element broken section of the present invention, and
Fig. 2 is the flow chart relevant with filter element of the present invention.
The specific embodiment
According to Fig. 1 and Fig. 2, the filter chamber 1 of filter element is connected with input pipe 2 and output duct 3, is used for the CO gas that input and output will be handled at filter element.Similarly, filter chamber 1 also is connected with inert gas supply conduit 4, water supply conduit 5 and is used to remove the discharge tube 6 of solid separated from the gas.
The CO gas that flows to filter chamber 1 flows to filtration members 7 through the inlet hole of input pipe 2, and filtration members 7 is made by heat treated correct grinding polyethylene, and CO gas can flow through filtration members 7.After flowing through filtration members 7, CO gas flows through the outlet opening of output duct 3, further to utilize.Contained solid residue sprays nitrogen by the gas nozzle 8 that is connected with inert gas supply conduit 4 to the surface periodic ground of filtration members 7 in the CO gas in continued operation on filtration members 7 surfaces.The nitrogen jet flow is controlled by the control module 9 that is connected with inert gas supply conduit 4.1 bottom 10 descends the solid of being removed by nitrogen towards the filter chamber, and for the ease of removing solid, water is transported to filter chamber 1 from water supply conduit 5, and the nozzle 11 that utilization is connected with water supply conduit 5 is sprayed onto water on the wall of filter chamber at least in part.Like this, the mud that is made of solid and water flows to the bottom of bottom 10, and the bottom of bottom 10 is provided with an obstruction piece 13.Obstruction piece 13 is used for regulating flowing of the drain chamber 12 of mud below being located at bottom 10.By drain chamber 12, prevented and to have flowed out to the external world with the CO gas that mud is carried secretly from filter element 1, thereby the other end of drain chamber 12 on the mud flow direction also is provided with an obstruction piece 14.Regulate the operation of obstruction piece 13 and 14 by control module 9, make obstruction piece 13 and 14 open in turn, promptly one another is closed when opening.The mud of discharging from drain chamber 12 flows to discharge tube 6, and discharge tube 6 is provided with water seal 15, if to guarantee that CO gas can not flow to the external world when the interworking multilated of for example obstruction piece 13 and 14.Also utilize control module 9 to control the use of spray nozzle 11.
According to the flow chart of CO gas shown in Figure 2, the CO gas that obtains from smelting furnace 21 at first flows to scrubber 22, in this scrubber, removes the part solid in the gas in case of necessity.In order to ensure CO gas enough pressure is arranged, gas is delivered to the filter chamber 1 of filter element 24 through air blast 23.
Claims (17)
1, a kind of being used for the process gas that the ferroalloy metallurgy process generates is that CO gas filters so that reduce the method for solids content in the gas basically, in the method, CO gas is transported at least one gas filtration unit (24), it is characterized in that, in this gas filtration unit (24), the gas that contains solid flows through at least one filtration members (7), blows (8) inert gas so that solid material breaks away from from the surface of filtration members (7) to filtration members (7); And,, make solid material become mud to the liquid in gas filtration unit (24) by feed (11) in order to remove the solid material that breaks away from from filtration members (7) surface; And, the mud that contains solid material is removed from gas filtration unit (24) by drain chamber (12).
2, method according to claim 1 is characterized in that, CO gas is delivered to this gas filtration unit (24) through scrubber (22).
3, method according to claim 1 and 2 is characterized in that, in continued operation CO gas is periodically sent into this gas filtration unit (24).
4, according to the described method of above-mentioned arbitrary claim, it is characterized in that, in continued operation, inert gas is periodically sent into this gas filtration unit (24).
According to the described method of above-mentioned arbitrary claim, it is characterized in that 5, the mud that contains solid material is sent from this gas filtration unit (24) through fluid-tight.
According to the described method of above-mentioned arbitrary claim, it is characterized in that 6, after the filtration (24), solids content is less than 5mg/Nm in the CO gas
3, preferably be less than 1mg/Nm
3
7, a kind of being used for the process gas that the ferroalloy metallurgy process generates is that CO gas filters so that reduce the device of solids content in the gas basically, it is characterized in that filter element (24) comprises filter chamber (1), with the drain chamber (12) of this filter chamber's mechanical connection and the discharge tube (6) that is used to discharge the solid that goes out from gas filtration; Filter chamber (1) is provided with and is used at least one filtration members (7) that solid is separated from gas and is used for the solid that filters out at least one nozzle (8,11) that discharge (1) from the filter chamber.
8, device according to claim 7 is characterized in that, scrubber (22) is installed in filter element (24) before on gas flow direction.
9, according to claim 7 or 8 described devices, it is characterized in that, be provided with obstruction piece (13) at inlet hole at least in the solids discharge chamber (6).
According to claim 7,8 or 9 described devices, it is characterized in that 10, solids discharge chamber (12) constitutes the part of the discharge tube (6) that is connected with filter chamber (1).
11, device according to claim 10 is characterized in that, the end place that discharge tube (6) is connected with the filter chamber is equipped with first obstruction piece (13), and from first obstruction piece (13) a distance second obstruction piece (14) is being installed; Space in the discharge tube (6) between first and second obstruction piece constitutes solids discharge chamber.
According to claim 7,8 or 9 described devices, it is characterized in that 12, solids discharge chamber (12) is installed between filter chamber (1) and the discharge tube (6) as individual components.
13, device according to claim 12 is characterized in that, solids discharge chamber (12) is provided with obstruction piece (13,14), and obstruction piece is located at filter chamber (1) and locates with the joint portion of discharge tube (6) with the place, joint portion and the drain chamber (12) of drain chamber (12).
According to the described device of arbitrary claim among the claim 7-13, it is characterized in that 14, discharge tube (6) is provided with fluid-tight (15).
According to the described device of arbitrary claim among the claim 7-14, it is characterized in that 15, discharge tube (6) is connected with the parts that are provided with fluid-tight (15).
According to the described device of arbitrary claim among the claim 7-15, it is characterized in that 16, filter chamber (1) is provided with at least one nozzle (8) that is used for to filter chamber (1) feed inert gas.
According to the described device of arbitrary claim among the claim 7-16, it is characterized in that 17, filter chamber (1) is provided with at least one nozzle (11) that is used for to filter chamber (1) feed liquid medium.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI20061133 | 2006-12-19 | ||
| FI20061133A FI20061133A0 (en) | 2006-12-19 | 2006-12-19 | Equipment for filtering process gas |
| FI20070961 | 2007-12-11 | ||
| FI20070961A FI121368B (en) | 2006-12-19 | 2007-12-11 | Method and equipment for filtering process gas |
| PCT/FI2007/000295 WO2008074912A1 (en) | 2006-12-19 | 2007-12-18 | Method and apparatus for filtering process gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101578128A true CN101578128A (en) | 2009-11-11 |
| CN101578128B CN101578128B (en) | 2012-07-04 |
Family
ID=37623757
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007800472797A Active CN101578128B (en) | 2006-12-19 | 2007-12-18 | Method and apparatus for filtering process gas |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN101578128B (en) |
| FI (1) | FI20061133A0 (en) |
| ZA (1) | ZA200904059B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB672458A (en) * | 1949-08-12 | 1952-05-21 | Metallgesellschaft Ag | Improvements in or relating to electrofilters |
| DE2540003C3 (en) * | 1975-09-09 | 1978-05-03 | Wilhelm Schuler, Filtertechnik Gmbh, 6719 Eisenberg | Process for removing a filter cake, in particular for hot gas filtration, and filter apparatus for carrying out the process |
| DE3841009C1 (en) * | 1988-12-06 | 1990-03-01 | Kernforschungszentrum Karlsruhe Gmbh, 7500 Karlsruhe, De | |
| DE19710431C2 (en) * | 1997-03-13 | 1999-05-20 | Karlsruhe Forschzent | Process for cleaning filters loaded with dust or aerosol particles |
| CN1077444C (en) * | 1999-01-05 | 2002-01-09 | 北京东方明德企业管理顾问有限公司 | Fog-net type desulfurating dust-removing equipment |
| WO2001051172A2 (en) * | 2000-11-02 | 2001-07-19 | Niro A/S | A filter unit for filtering gas |
-
2006
- 2006-12-19 FI FI20061133A patent/FI20061133A0/en not_active Application Discontinuation
-
2007
- 2007-12-18 CN CN2007800472797A patent/CN101578128B/en active Active
-
2009
- 2009-06-10 ZA ZA200904059A patent/ZA200904059B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| ZA200904059B (en) | 2010-04-28 |
| FI20061133A0 (en) | 2006-12-19 |
| CN101578128B (en) | 2012-07-04 |
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Address after: Tampere Patentee after: Metso ottotai Finland Address before: Tampere Patentee before: Metso Minerals Ltd. |
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