CN101578128B - Method and apparatus for filtering process gas - Google Patents
Method and apparatus for filtering process gas Download PDFInfo
- Publication number
- CN101578128B CN101578128B CN2007800472797A CN200780047279A CN101578128B CN 101578128 B CN101578128 B CN 101578128B CN 2007800472797 A CN2007800472797 A CN 2007800472797A CN 200780047279 A CN200780047279 A CN 200780047279A CN 101578128 B CN101578128 B CN 101578128B
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- gas
- chamber
- filter
- filter chamber
- conduit
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000001914 filtration Methods 0.000 title claims abstract description 38
- 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 20
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 239000011343 solid material Substances 0.000 claims abstract description 11
- 229910001021 Ferroalloy Inorganic materials 0.000 claims abstract description 9
- 238000004140 cleaning Methods 0.000 claims description 8
- 238000005272 metallurgy Methods 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 abstract description 6
- 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
- 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
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 fromthe 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 escape 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 is made improvement 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 up 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 near first end of this cylindrical element the conduit that is used for supplying to the gas that will handle the filter chamber is installed, the conduit that is used for discharging gas the filter chamber is installed at the other end of cylindrical element or near the other end of 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 and are used for discharging the discharge orifice from the gas solid separated.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 filter member are installed advantageously in the filter chamber.If the quantity of process gas basically seldom, also a filter member can only be installed in the filter chamber, but with regard to the installation and maintenance filter member, more advantageously be in the filter chamber, to use some filter member.Filter member is mounted in the filter chamber and makes filter member roughly cover the entire cross section of filter chamber, or advantageously is to cover the gas that will handle in the filter chamber inlet hole is directed to that part of cross section of outlet opening institute warp from the filter chamber at least.The porous material that the most handy gas that will clean of filter member can flow through, plastics or other this type of material for example ceramic material are processed.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.Filter member also available metal is processed.
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 through this inert gas conduit, be used for the liquid medium of removing from the filter member solid separated 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 filter member towards filter member 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 scalable for example to flow through duration or intensity and the frequency that blows the cycle of one air-flow of this conduit.
Be used for be bonded on the filter member 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 filter member, the filter member wall, and a part of nozzle is used for removing solid from the free space of filter member.In the cycle that repeats, remove solid continuously or preferably with this liquid medium.By liquid medium and the mud that constitutes from the gas solid separated through the mud emission hole that forms in the bottom, filter chamber 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 first end of discharge tube just near an end place that is connected with the filter chamber; 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 in discharge tube, can form for example water seal of a fluid-tight.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 getting 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 supplies to inert gas 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, through before getting into 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 is located at the filter member in the filter chamber through the inlet hole flow direction of the filter chamber of filter element; In this case; Contained solid material is blocked on the filter member surface in the gas, and the gas itself after cleaning continues to flow through filter member.For the cleaning and filtering part, filter member is carried out nitrogen injection, its duration, pressure and period frequency are regulated by a control module.Water is conveyed in the filter element through the nozzle of installing in the filter element, is used for being sent to the filter element bottom to the solid material that breaks away from from filter member.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 filter member is removed.When water supply stopped, first obstruction piece that is used to discharge on the discharge orifice flow direction of mud was closed.
In order to leave drain chamber to 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.The water seal that discharge tube advantageously is designed to make slurry flows cross and 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 is CO gas according to the inventive method with the process gas that device filters, and a small amount of carbon monoxide also is breakneck, filter therefore that to prevent in the CO gas process that this gas from getting into 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
Specify the present invention with reference to the accompanying drawings, 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.Likewise, 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 filter member 7 through the inlet hole of input pipe 2, and filter member 7 is processed by heat treated correct grinding polyethylene, and CO gas can flow through filter member 7.After flowing through filter member 7, CO gas flows through the outlet opening of output duct 3, further to utilize.Contained solid residue sprays nitrogen through the gas nozzle 8 that is connected with inert gas supply conduit 4 to the surface periodic ground of filter member 7 in the CO gas in continued operation on filter member 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 up 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 through 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)
- One kind to be used for the process gas that the ferroalloy metallurgy process generates be 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 filter member (7), and the nozzle (8) through inert gas conduit (4) and inert gas conduit comes to blow inert gas so that solid material breaks away from from the surface of filter member (7) to filter member (7); And, for the ease of removing, by the nozzle (11) of liquid medium conduit (5) and liquid medium conduit and the liquid that is fed in the gas filtration unit (24) makes solid material become mud from the solid material of filter member (7) surface disengaging; And, remove the mud that contains solid material from gas filtration unit (24) through 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, periodically sends into this gas filtration unit (24) to CO gas.
- 4. method according to claim 1 and 2 is characterized in that, in continued operation, periodically sends into this gas filtration unit (24) to inert gas.
- 5. method according to claim 1 and 2 is characterized in that, the mud that contains solid material send from this gas filtration unit (24) through fluid-tight.
- 6. method according to claim 1 and 2 is characterized in that after the filtration, solids content is less than 5mg/Nm in the CO gas 3
- One kind to be used for the process gas that the ferroalloy metallurgy process generates be 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 filter member (7), inert gas conduit and the liquid medium conduit of solid from the gas separation; The inert gas that is used for the cleaning and filtering part is carried through this inert gas conduit, is used for being transported to the filter chamber to the liquid medium of removing from the filter member solid separated from the filter chamber through this liquid medium conduit; And filter element (24) is provided with at least one at the nozzle that is used for the conduit of inert gas (4) (8) with at least one is in the nozzle that is used for the conduit of liquid medium (5) (11).
- 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 (12).
- 10. according to claim 7 or 8 described devices, it is characterized in that 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.
- 12., it is characterized in that solids discharge chamber (12) is installed between filter chamber (1) and the discharge tube (6) as individual components according to claim 7 or 8 described devices.
- 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).
- 14., it is characterized in that discharge tube (6) is provided with fluid-tight (15) according to claim 7 or 8 described devices.
- 15., it is characterized in that discharge tube (6) is connected with the parts that are provided with fluid-tight (15) according to claim 7 or 8 described devices.
- 16., it is characterized in that filter chamber (1) is provided with at least one nozzle (8) that is used for to filter chamber (1) feed inert gas according to claim 7 or 8 described devices.
- 17., it is characterized in that filter chamber (1) is provided with at least one nozzle (11) that is used for to filter chamber (1) feed liquid medium according to claim 7 or 8 described devices.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI20061133A FI20061133A0 (en) | 2006-12-19 | 2006-12-19 | Equipment for filtering process gas |
| FI20061133 | 2006-12-19 | ||
| 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 CN101578128A (en) | 2009-11-11 |
| CN101578128B true 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) |
Citations (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 |
| DE2540003A1 (en) * | 1975-09-09 | 1977-03-10 | Schuler Filtertech Wilhelm | Cleaning hot gas filters by water injection - causing pressure wave on clean gas side to release filter cake |
| US5112585A (en) * | 1988-12-06 | 1992-05-12 | Kernforschungszentrum Karlsruhe Gmbh | Process of removing flue gas cleaning residues during the wet cleaning of flue gases by drying and construction |
| EP0864347A2 (en) * | 1997-03-13 | 1998-09-16 | Forschungszentrum Karlsruhe GmbH | Process for cleaning filters containing dust and aerosol particles |
| CN1223162A (en) * | 1999-01-05 | 1999-07-21 | 北京东方明德企业管理顾问有限公司 | Fog-net type desulfurating dust-removing equipment |
| CN1455697A (en) * | 2000-11-02 | 2003-11-12 | 尼罗有限公司 | 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
Patent Citations (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 |
| DE2540003A1 (en) * | 1975-09-09 | 1977-03-10 | Schuler Filtertech Wilhelm | Cleaning hot gas filters by water injection - causing pressure wave on clean gas side to release filter cake |
| US5112585A (en) * | 1988-12-06 | 1992-05-12 | Kernforschungszentrum Karlsruhe Gmbh | Process of removing flue gas cleaning residues during the wet cleaning of flue gases by drying and construction |
| EP0864347A2 (en) * | 1997-03-13 | 1998-09-16 | Forschungszentrum Karlsruhe GmbH | Process for cleaning filters containing dust and aerosol particles |
| CN1223162A (en) * | 1999-01-05 | 1999-07-21 | 北京东方明德企业管理顾问有限公司 | Fog-net type desulfurating dust-removing equipment |
| CN1455697A (en) * | 2000-11-02 | 2003-11-12 | 尼罗有限公司 | Filter unit for filtering gas |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101578128A (en) | 2009-11-11 |
| FI20061133A0 (en) | 2006-12-19 |
| ZA200904059B (en) | 2010-04-28 |
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