CN203822494U - Dust and sulfur removal device with cyclone separator - Google Patents
Dust and sulfur removal device with cyclone separator Download PDFInfo
- Publication number
- CN203822494U CN203822494U CN201420062825.1U CN201420062825U CN203822494U CN 203822494 U CN203822494 U CN 203822494U CN 201420062825 U CN201420062825 U CN 201420062825U CN 203822494 U CN203822494 U CN 203822494U
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- cyclone separator
- laval
- centerbody
- shell
- diffuser pipe
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The utility model discloses a dust and sulfur removal device with a cyclone separator. A humidifying device, the cyclone separator, a Laval nozzle and a diffuser pipe are sequentially arranged along the flow direction of exhaust gas, and a central body is arranged inside the cyclone separator, the Laval nozzle and the diffuser pipe; an exhaust gas flow channel is formed in a spatial area among the cyclone separator, the Laval nozzle, a diffuser pipe wall and the central body. Spiral blades are arranged at a semiellipsoid section of the central body inside the cyclone separator and are designed by using an unequal pitch method along a helix. A first particulate matter outlet is arranged at the throat of the Laval nozzle and is used for discharging separated sulfides and particulate matters in the exhaust gas. The dust and sulfur removal device with the cyclone separator, provided by the utility model has the advantages of simple structure and low manufacturing and use costs, the purified exhaust gas can be provided for a diesel engine without adding too much equipment, and the emission of the sulfides can be reduced, so that the more stringent emission requirements can be met.
Description
Technical field
The utility model relates to diesel exhaust preconditioning technique field, relates in particular to a kind of dust removing desulfurizing device that adopts cyclone separator.
Background technique
EGR Technology (being called for short EGR) is the major technique that diesel engines at present reduces exhaust emissions.For realizing EGR Technology, the waste gas that diesel engine need be discharged is introduced suction tude, to reach the object that reduces discharged nitrous oxides.Due to the fuel used middle sulphur content of diesel engine (particularly marine diesel engine) too high (generally more than 1000ppm), cause in diesel exhaust particulate matter and sulfide content too high, therefore when adopting EGR Technology, can bring corrosion and the blockage problem of gas recirculation system key components and parts (EGR pump, EGR valve and cooler for recycled exhaust gas etc.) and diesel engine body key components and parts (suction valve assembly, cylinder sleeve etc.).Thereby very crucial to the pretreatment of waste gas in EGR.
Existing waste gas pretreatment mainly adopts the technology such as diesel particulate filter to solve this problem, makes a concrete analysis of as follows:
1, adopt and take the particulate filter (DPF) that honeycomb ceramic filter piece is filter core, can effectively reduce diesel particulate discharge (reducing particulate matter approximately more than 80%).But being DPF particle filter, its outstanding problem facing at present need to consume the cyclic regeneration that a large amount of precious metals (as Pt etc.) are realized DPF, greatly increase the cost (according to incompletely statistics, the precious metal of the U.S. annual about 54% has all been used in automotive industry) of diesel engine.
2,, for reducing the cost of exhaust after treatment system, adopt diesel oxidation catalyst (DOC) in conjunction with particulate oxidation catalyst converter (POC), to realize the reduction (reducing particulate matter approximately more than 505) of diesel particulate discharge.But wherein DOC must be used low-sulfur diesel-oil, POC need to adopt noble metal catalyst to realize good particle-removing effect equally.
In addition, adopt DOC can bring the complexity of pretreatment system after exhaust greatly to increase in conjunction with POC, be unfavorable for its application on marine diesel engine product.
Therefore, those skilled in the art is devoted to develop and a kind of diesel exhaust is carried out to pretreated sulphur removal particle-removing device, when meeting and reducing exhaust emissions, effectively reduces system user cost and system complex degree.
Model utility content
Because the above-mentioned defect of prior art, technical problem to be solved in the utility model is to provide a kind of dust removing desulfurizing device that adopts cyclone separator, and simple in structure, user cost is low, can effectively for diesel exhaust, carry out the pretreatment of sulphur removal particle-removing.
For achieving the above object, aspect one of the present utility model, provide a kind of dust removing desulfurizing device that adopts cyclone separator, along the flow direction of waste gas, be disposed with damping device, cyclone separator, laval nozzle and diffuser pipe; Described cyclone separator, laval nozzle and diffuser pipe are coaxial; The inside of described cyclone separator, laval nozzle and diffuser pipe is provided with centerbody; Described centerbody comprises semiellipsoid section, contraction section, straight section, the first extending section and the second extending section; Described cyclone separator comprises semiellipsoid section and the helical blade of cyclone separator shell, centerbody; The semiellipsoid section of described centerbody is provided with described helical blade, and described helical blade is between the semiellipsoid section of described cyclone separator shell and described centerbody; Described laval nozzle comprises Laval collapsible tube, aditus laryngis and the Laval expanding duct axially connecting in turn; The contraction section of the corresponding centerbody in inside of described Laval collapsible tube, the straight section of the corresponding centerbody in inside of described aditus laryngis, the first extending section of the corresponding centerbody in inside of described Laval expanding duct; Described diffuser pipe comprises the second extending section of diffuser pipe shell and centerbody; The lower end of described aditus laryngis is provided with the first particulate matter outlet; Described the first particulate matter outlet is one-body molded with described aditus laryngis, and from aditus laryngis to downward-extension one end distance.
Preferably, described the first particulate matter outlet is one-body molded with described aditus laryngis, and perpendicular to aditus laryngis place to downward-extension one end distance.
Alternatively, described cyclone separator shell, described laval nozzle and described diffuser pipe shell are one-body molded.
Alternatively, described cyclone separator shell, described laval nozzle and described diffuser pipe shell are fixed connection by assembled welding.
Further, described helical blade is pressed helix and is adopted uniform pitch method or the design of decreasing worm-pitch method, is circumferentially evenly arranged.
Further, described damping device adopts micro-mist humidification or ultrasonic humidifying.
Further, the inlet diameter of described Laval collapsible tube is throat diameter 3～4 times, entrance angle is 30～40 °, outlet angle is 20～30 °.
Further, described damping device and described cyclone separator are by pipeline communication, and described damping device is positioned at the top of cyclone separator.
Further, a part for described pipeline is coaxial with described helical blade, and described pipeline is set to: waste gas enters cyclone separator by pipeline with vertical angle; Described waste gas by after described pipeline over against described helical blade.
Further, the lower end of described cyclone separator shell is provided with the second particulate matter outlet, and described the second particulate matter outlet is one-body molded with described cyclone separator shell, and perpendicular to described cyclone separator shell to downward-extension one end distance; Described the second particulate matter outlet is positioned at the end of described cyclone separator shell.
Wherein, the end of described cyclone separator shell refers to the one end near laval nozzle.
In a preferred embodiment of the present utility model, a kind of waste gas pretreatment system for diesel engine, is disposed with damping device, cyclone separator, laval nozzle and diffuser pipe along the flow direction of waste gas; Described damping device and described cyclone separator are by pipeline communication, and described damping device is positioned at the top of cyclone separator; Described cyclone separator, laval nozzle and diffuser pipe are coaxial.The inside of described cyclone separator, laval nozzle and diffuser pipe is provided with centerbody, and the tube wall of described cyclone separator, laval nozzle and diffuser pipe and the area of space between centerbody form the flow channel of waste gas.Semiellipsoid section by centerbody in described cyclone separator is provided with helical blade, and described helical blade is pressed helix and adopted the design of decreasing worm-pitch method.Described laval nozzle comprises Laval collapsible tube, aditus laryngis and the Laval expanding duct axially connecting in turn; Described aditus laryngis place is provided with the first particulate matter outlet, for the discharge of the sulphide in waste gas separation and particulate matter.
As can be seen here, the utlity model has following beneficial effect:
1, the waste gas pretreatment system for diesel engine of the present utility model, simple in structure, manufacturing cost and use cost is low, does not need to increase too much equipment and can be diesel engine the waste gas after purification is provided, and reduce the discharge of sulphide, can meet more strict emission request.
2, the damping device of the waste gas pretreatment system for diesel engine of the present utility model, can form the waste gas absorbing after sulphide and particulate matter, by humidification, make sulphide and particulate matter form cohesion, increase oarse-grained size, form gas-liquid two-phase flow, be obviously conducive to the separation of follow-up particulate matter.
3, the helical blade of cyclone separator of the present utility model (screw type swirl vane), compares with traditional arc or prismatic blade, has stronger rotational flow capacity, cyclonic separation better effects if.Further, the setting of the position of helical blade and pipeline makes waste gas enter cyclone separator with vertical angle, can effectively improve the cyclonic separation effect of waste gas.
4, the end of cyclone separator of the present utility model below is provided with particulate matter outlet, sulphide through cyclone separator initial gross separation and particulate matter can be exported to combustion gas pretreatment system by this particulate matter, realize the timely discharge of sulphide and particulate matter, minimizing is to system, the particularly corrosion of laval nozzle and wearing and tearing.
5, laval nozzle of the present utility model adopts special calculating design, comprise position, entrance angle and the isoparametric design of outlet angle of the daraf(reciprocal of farad) that inlet diameter of collapsible tube and the ratio of throat diameter, aditus laryngis, be conducive to form strong eddy flow field, and then accelerate separated gas-liquid two-phase flow, and in the first particulate matter outlet at aditus laryngis place, sulphide and particulate matter are carried out to separation and discharge.In addition, the existence of centerbody, one side can effectively solve the whirlpool dissipation problem of rotary gas, improves the efficiency of cyclonic separation; Can reduce on the other hand the radial velocity gradient of rotary gas, reduce energy loss.
6, diffuser pipe of the present utility model can slow down to the waste gas after sulphur removal particle-removing and supercharging, can reduce the speed that waste gas enters follow-up emission-control equipment on the one hand, avoids the wearing and tearing to follow-up emission-control equipment; By supercharging, arrange on the other hand, reduce system pressure loss.
Below with reference to accompanying drawing, the technique effect of design of the present utility model, concrete structure and generation is described further, to understand fully the purpose of this utility model, feature and effect.
Accompanying drawing explanation
Fig. 1 is the principle schematic of the waste gas pretreatment system for diesel engine of a preferred embodiment of the present utility model.
Embodiment
As shown in Figure 1, in one embodiment, a kind of dust removing desulfurizing device that adopts cyclone separator, is disposed with damping device 1, cyclone separator 2, laval nozzle 3 and diffuser pipe 4 along the flow direction of waste gas.Cyclone separator 2, laval nozzle 3 and diffuser pipe 4 are coaxial; The inside of cyclone separator 2, laval nozzle 3 and diffuser pipe 4 is provided with centerbody 5.Centerbody 5 comprises semiellipsoid section, contraction section, straight section, the first extending section and the second extending section successively along the flow direction of waste gas.
Wherein, the direction of arrow in figure has represented the flow direction of waste gas in the dust removing desulfurizing device of employing cyclone separator of the present embodiment.
Damping device 1 is communicated with by pipeline 6 with cyclone separator 2.Damping device 1 adopts micro-mist humidification or ultrasonic humidifying.The waste gas of discharging when the outlet pipe of diesel engine enters after damping device 1, and first by adding wet process, the sulphide in waste gas and particulate matter etc. form the gas-liquid two-phase flow of the Identification of Soluble Organic compositions such as containing sulfate with wet air; In addition, add wet process postcure thing and particulate matter and form cohesion, increase oarse-grained size.
Cyclone separator 2 comprises semiellipsoid section and the helical blade 7 of cyclone separator shell, centerbody.The semiellipsoid section of centerbody is provided with helical blade 7, and helical blade 7 is between the semiellipsoid section of cyclone separator shell and centerbody.Helical blade 7 is pressed helix and is adopted uniform pitch method or the design of decreasing worm-pitch method, is circumferentially evenly arranged.When cyclone separator 2 adopts helical blade 7(, be called again screw type swirl vane) time, compare with traditional arc or prismatic blade, there is stronger rotational flow capacity, cyclonic separation better effects if.In addition, cyclone separator 2 adopts the helical blade 7 of decreasing worm-pitch method design, can reduce intake resistance, forms initial vortex gas-flow.
Certainly, in a poor embodiment of the present utility model, cyclone separator 2 still can be selected the modes such as arc or prismatic blade, realizes the initial gross separation of gas-liquid two-phase.
Alternatively, damping device 1 is located at the place ahead of cyclone separator 2, and coaxial with cyclone separator 2.Waste gas adds after wet process through damping device 1, directly enters the separation of carrying out gas-liquid two-phase in eddy flow shunt 2.
Wherein, the place ahead of cyclone separator 2 refers to the one end of spraying vertically 3 pipes away from Laval.
Preferably, damping device 1 is positioned at the top of cyclone separator 2, and damping device 1 is communicated with by pipeline 6 with cyclone separator 2.In addition, pipeline 6 is set to: waste gas enters cyclone separator 2 with vertical angle after by pipeline 6, waste gas by after pipeline 6 over against helical blade 7.When adopting which, can be understood that, through adding the waste gas of wet process, with vertical angle, enter cyclone separator 2, can further submit the cyclonic separation effect of waste gas to.
Laval nozzle 3 comprises Laval collapsible tube, aditus laryngis and the Laval expanding duct axially connecting in turn.The contraction section of the corresponding centerbody in inside of Laval collapsible tube, the straight section of the corresponding centerbody in inside of aditus laryngis, the first extending section of the corresponding centerbody in inside of Laval expanding duct.
For marine diesel engine, its vent systems Mach number is no more than 0.6, is subsonic flow.From fluid mechanics and engineering thermodynamics principle, in subsonic envelope, gas flows in shrinking shape passage, and air-flow can accelerate, and Mach number increases, and gas pressure can decline to some extent, and this process is inflation process.Otherwise if subsonic flow flows in expansion shape passage, gas will inevitably slow down, Mach number reduces, and gas pressure raises to some extent, and this process is called compression process.
Model utility people, in conjunction with following gas dynamics formula, carries out the structural design of contraction section and first extending section of laval nozzle:
(1) ideal-gas equation:
(2) continuous flow equation:
(3) sonic equation of gas:
(4) Mach number calculates formula:
Obtain, for marine diesel engine, a kind of preferably actual range is: the inlet diameter of Laval collapsible tube is throat diameter 3～4 times, entrance angle is 30～40 °, outlet angle is 20～30 °, is conducive to form strong eddy flow field, accelerates separated gas-liquid two-phase flow.
The lower end of the aditus laryngis 8 of laval nozzle 3 is provided with the first particulate matter outlet 9; The first particulate matter outlet 9 is one-body molded with aditus laryngis 8, and perpendicular to Laval rectilinear tubes to downward-extension one end distance.When waste gas enters after laval nozzle 3, form eddy flow field, according to conservation of angular momentum principle, along with the vortex gas-flow of gas-liquid two-phase flow the reducing of turning radius in laval nozzle 3, angular velocity increases greatly, and two phase flow eddy flow further strengthens, and reaches threshold state (velocity of sound) in aditus laryngis 8 place's airspeeies, particulate matter and sulphide are discharged from the first particulate matter outlet 9, thereby realize the purified treatment to the sulphur removal particle-removing of waste gas.
Diffuser pipe 4 comprises the second extending section of diffuser pipe shell and centerbody.When waste gas is through laval nozzle 3, at aditus laryngis 8 places by particulate matter and sulphide from the first particulate matter outlet 9 is discharged, the waste gas after purification moves on, and enters diffuser pipe 4, along with the increase of the turning radius of vortex gas-flow, swirl velocity reduces, pressure increases.Visible, waste gas, through diffuser pipe 4, can reduce the speed that waste gas enters follow-up emission-control equipment on the one hand, avoids the wearing and tearing to follow-up emission-control equipment; By supercharging, arrange on the other hand, reduce system pressure loss.
In the present embodiment, centerbody 5 is coaxial with cyclone separator shell, laval nozzle and diffuser pipe shell; Cyclone separator shell, laval nozzle and diffuser pipe shell are one-body molded.Certainly, cyclone separator shell, laval nozzle and diffuser pipe shell also can be fixed connection by assembled welding.
The setting of centerbody 5, one side can effectively solve the whirlpool dissipation problem of rotary gas, improves the efficiency of cyclonic separation; Can reduce on the other hand the radial velocity gradient of rotary gas, reduce energy loss.
In addition, the cyclone separator shell of the present embodiment, laval nozzle and diffuser pipe shell can also directly utilize the outlet pipe of diesel engine to transform, and can not need to introduce other equipment, can further reduce space cost and the cost of material of transformation.
Can be understood that, the second particulate matter outlet can also be set up in the lower end of cyclone separator shell, and the second particulate matter outlet is one-body molded with cyclone separator shell, and perpendicular to cyclone separator shell to downward-extension one end distance; The second particulate matter outlet is positioned at the end of cyclone separator shell.The end below of cyclone separator is provided with particulate matter outlet, sulphide through cyclone separator initial gross separation and particulate matter can be exported to combustion gas pretreatment system by this particulate matter, realize the timely discharge of sulphide and particulate matter, minimizing is to system, the particularly corrosion of laval nozzle and wearing and tearing.
Wherein, the end of cyclone separator shell refers to one end of close laval nozzle vertically.
Further, a kind of using method of the dust removing desulfurizing device based on above-mentioned employing cyclone separator, comprises the following steps:
The waste gas of 1, discharging in the outlet pipe of diesel engine enters damping device 1 and adds wet process.
2, through the waste gas adding after wet process, enter cyclone separator 2, the sulphide in waste gas and particulate matter are carried out to initial gross separation.
3, the waste gas through initial gross separation enters laval nozzle 3, and the sulphide in waste gas and particulate matter are carried out to further separation, at aditus laryngis 8, sulphide and particulate matter is discharged from the first particulate matter outlet 9.
4, the waste gas after sulphur removal particle-removing enters diffuser pipe 4 and slows down and supercharging, combustion gas pretreatment system.
The working principle of the present embodiment is as follows: on diesel exhaust gas pipeline, first install damping device 1(additional and can adopt the modes such as micro-mist humidification or ultrasonic humidifying), make sulphide in diesel exhaust, particulate matter etc. form the gas-liquid two-phase flow of the Identification of Soluble Organic compositions such as containing sulfate with wet air.Then it is radially introduced by cyclone separator 2, wherein the rotation blade in cyclone separator 7 adopts decreasing worm-pitch method to design to reduce intake resistance by helix, forms initial vortex gas-flow.According to conservation of angular momentum principle, along with two phase flow vortex gas-flow the reducing of turning radius in laval nozzle, angular velocity increases greatly, and two phase flow eddy flow further strengthens, and improves gas-liquid separation efficiency.At convergent jet pipe aditus laryngis 8 places of laval nozzle 3, particulate matter and sulphide outlet are set, particulate matter and sulphide are discharged in time.4 sections of diffuser pipes, along with the increase of nozzle diameter, supersonic flow is decelerated to subsonic flow, makes the pitot loss of whole exhausted gas post-processing system less.Finally the diesel engine vent gas after purifying can be used for follow-up diesel engine emission-reduction technology.
As can be seen here, the dust removing desulfurizing device of the employing cyclone separator of the present embodiment, simple in structure, manufacturing cost and use cost is low, do not need to increase too much equipment and can be marine diesel engine the waste gas after purification is provided, and reduce the discharge of sulphide, can meet more strict emission request.
More than describe preferred embodiment of the present utility model in detail.Should be appreciated that those of ordinary skill in the art just can make many modifications and variations according to design of the present utility model without creative work.Therefore, all technician in the art comply with design of the present utility model on the basis of existing technology by the available technological scheme of logical analysis, reasoning, or a limited experiment, all should be in the determined protection domain by claims.
Claims (9)
1. a dust removing desulfurizing device that adopts cyclone separator, is characterized in that, along the flow direction of waste gas, is disposed with damping device, cyclone separator, laval nozzle and diffuser pipe; Described cyclone separator, laval nozzle and diffuser pipe are coaxial; The inside of described cyclone separator, laval nozzle and diffuser pipe is provided with centerbody; Described centerbody comprises semiellipsoid section, contraction section, straight section, the first extending section and the second extending section;
Described cyclone separator comprises semiellipsoid section and the helical blade of cyclone separator shell, centerbody; The semiellipsoid section of described centerbody is provided with described helical blade, and described helical blade is between the semiellipsoid section of described cyclone separator shell and described centerbody;
Described laval nozzle comprises Laval collapsible tube, aditus laryngis and the Laval expanding duct axially connecting in turn; The contraction section of the corresponding centerbody in inside of described Laval collapsible tube, the straight section of the corresponding centerbody in inside of described aditus laryngis, the first extending section of the corresponding centerbody in inside of described Laval expanding duct;
Described diffuser pipe comprises the second extending section of diffuser pipe shell and centerbody;
The lower end of described aditus laryngis is provided with the first particulate matter outlet; Described the first particulate matter outlet is one-body molded with described aditus laryngis, and from Laval rectilinear tubes to downward-extension one end distance.
2. the dust removing desulfurizing device of employing cyclone separator as claimed in claim 1, is characterized in that, described cyclone separator shell, described laval nozzle and described diffuser pipe shell are one-body molded.
3. the dust removing desulfurizing device of employing cyclone separator as claimed in claim 1, is characterized in that, described cyclone separator shell, described laval nozzle and described diffuser pipe shell are fixed connection by assembled welding.
4. the dust removing desulfurizing device of employing cyclone separator as claimed in claim 1, is characterized in that, described helical blade is pressed helix and adopted uniform pitch method or the design of decreasing worm-pitch method, is circumferentially evenly arranged.
5. the dust removing desulfurizing device of employing cyclone separator as claimed in claim 1 system, is characterized in that, described damping device adopts micro-mist humidification or ultrasonic humidifying.
6. the dust removing desulfurizing device of employing cyclone separator as claimed in claim 1, is characterized in that, the inlet diameter of described Laval collapsible tube is throat diameter 3～4 times, entrance angle is 30～40 °, outlet angle is 20～30 °.
7. the dust removing desulfurizing device of employing cyclone separator as claimed in claim 1, is characterized in that, described damping device and described cyclone separator are by pipeline communication, and described damping device is positioned at the top of cyclone separator.
8. the dust removing desulfurizing device of employing cyclone separator as claimed in claim 7, is characterized in that, a part for described pipeline is coaxial with described helical blade, and described pipeline is set to: waste gas enters cyclone separator by pipeline with vertical angle.
9. the dust removing desulfurizing device of employing cyclone separator as claimed in claim 1, it is characterized in that, the lower end of described cyclone separator shell is provided with the second particulate matter outlet, described the second particulate matter outlet is one-body molded with described cyclone separator shell, and perpendicular to described cyclone separator shell to downward-extension one end distance; Described the second particulate matter outlet is positioned at the end of described cyclone separator shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420062825.1U CN203822494U (en) | 2014-02-12 | 2014-02-12 | Dust and sulfur removal device with cyclone separator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420062825.1U CN203822494U (en) | 2014-02-12 | 2014-02-12 | Dust and sulfur removal device with cyclone separator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203822494U true CN203822494U (en) | 2014-09-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420062825.1U Expired - Fee Related CN203822494U (en) | 2014-02-12 | 2014-02-12 | Dust and sulfur removal device with cyclone separator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203822494U (en) |
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2014
- 2014-02-12 CN CN201420062825.1U patent/CN203822494U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140910 Termination date: 20200212 |
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| CF01 | Termination of patent right due to non-payment of annual fee |