CN111298522A - Separation device and method for metal powder condensed phase combustion products - Google Patents
Separation device and method for metal powder condensed phase combustion products Download PDFInfo
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- CN111298522A CN111298522A CN202010246880.6A CN202010246880A CN111298522A CN 111298522 A CN111298522 A CN 111298522A CN 202010246880 A CN202010246880 A CN 202010246880A CN 111298522 A CN111298522 A CN 111298522A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
Abstract
The invention discloses a separation device for a metal powder condensed phase combustion product, which comprises: the combustion chamber and the separation section are integrally connected and communicated along the axial direction; the front end of the combustion chamber is used for being communicated with a powder supply system pipeline. The separation section is a cavity formed by a shell and comprises an inlet arc section, a centrifugal section and an outlet section which are communicated in sequence from front to back; in the inlet arc section, the upper wall of the inlet arc section is a downward curved arc wall surface from front to back; in the centrifugal section, the upper wall and the lower wall of the centrifugal section are all arc-shaped and bent downwards to form a concave cavity of the lower wall of the pipe body; the outlet section comprises an upper outlet of the separation section and a lower outlet of the separation section which are arranged up and down and are mutually independent. The separation device realizes the separation of the metal condensed phase combustion product and the high-temperature fuel gas.
Description
Technical Field
The invention belongs to the technical field of metal powder utilization, and particularly relates to a device and a method for separating a condensed phase combustion product of metal powder.
Background
Compared with the traditional fossil fuel and other clean energy, the metal powder fuel has higher volume energy density, and meanwhile, the oxide generated by combustion is non-toxic and stable, and the recovery and utilization of the metal condensed phase combustion product can be realized, so that the metal powder fuel has great development potential as the clean energy.
In order to realize the recycling of the metal powder fuel, a metal powder combustion device model is provided, and the model comprises a metal powder fuel supply system, a combustion chamber and a condensed phase product separation and collection system. The metal powder condensed phase combustion product obtained by separation in the metal powder combustion device can be reduced by electrolysis or other methods, so that the metal powder fuel is obtained, and the collection and the recycling of the metal powder fuel are realized.
In the existing gas-solid separation technology, common separation mechanisms include gravity settling, inertia force separation, interception separation, charge separation and the like, in addition, the separation is carried out by depending on the actions of thermophoretic force, diffusion swimming force, magnetic field force, sound field force, radiation force and the like, and people often utilize the agglomeration characteristic and wetting characteristic of particles to improve or achieve the separation purpose. However, the gravity settling chamber can only separate coarse particles above 100 μm; the cyclone separator has lower efficiency for capturing particles smaller than 5 mu m, the single cyclone separator has certain limit on the air handling capacity, and the structure is larger; the electrostatic separation is suitable for separating charged solid particles in gas-solid two-phase flow, and the equipment is huge and is not suitable for two-phase flow containing high-concentration solid particles; the wet washing separation needs gas with liquid mist, needs to be used at a lower temperature, needs to recover and circulate huge waste liquid, and limits the application range of the wet washing separation; the filtration and separation equipment is large and is not easy to discharge and clean; the magnetic separation technology is mainly used for separating magnetic solid particles in gas-solid two-phase flow; ultrasonic separation techniques require higher acoustic frequencies for smaller particle sizes and certain requirements for particle concentration levels in the gas. Therefore, a condensed phase product separation device suitable for a metal powder combustion device needs to be designed, and efficient recycling of metal powder fuel is achieved.
[ summary of the invention ]
The invention aims to provide a separation device for metal powder condensed phase combustion products, which realizes the separation of the metal condensed phase combustion products and high-temperature fuel gas.
The invention adopts the following technical scheme: an apparatus for separating condensed phase combustion products of metal powders, comprising: the combustion chamber and the separation section are integrally connected and communicated along the axial direction; the front end of the combustion chamber is used for being communicated with a powder supply system pipeline.
The separation section is a cavity formed by a shell and comprises an inlet arc section, a centrifugal section and an outlet section which are communicated in sequence from front to back; in the inlet arc section, the upper wall of the inlet arc section is a downward curved arc wall surface from front to back; in the centrifugal section, the upper wall and the lower wall of the centrifugal section are all arc-shaped and bent downwards to form a concave cavity of the lower wall of the pipe body; the outlet section comprises an upper outlet of the separation section and a lower outlet of the separation section which are arranged up and down and are mutually independent.
Further, the inner diameter of the combustion chamber is 50mm, and the radius R of the arc of the inlet arc segment is 145 mm.
Furthermore, the height H between the upper lowest point and the lower lowest point of the centrifugal section is 25 mm.
Further, the horizontal distance L between the lowest point of the centrifugal section and the branching point of the upper outlet and the lower outlet of the outlet section is 30 mm.
Further, the outlet on the separation section is inclined upwards from front to back.
Further, the powder supply system comprises a powder storage tank, wherein the powder outlet end of the powder storage tank is communicated with the front end of the combustion chamber, and the powder outlet end of the powder storage tank is also communicated with the fluidized gas pipeline and used for carrying the metal particles into the combustion chamber.
The invention discloses a separation method of a metal powder condensed phase combustion product, which comprises the following steps: metal powder and fluidized gas in the powder storage tank are uniformly mixed and enter a combustion chamber to be combusted in the combustion chamber, a metal condensed phase combustion product generated after combustion and high-temperature gas enter an inlet arc section of the separation section and collide with the upper wall of the inlet arc section, the metal condensed phase combustion product is changed from a straight line to move forward in a direction facing the lower wall surface of the centrifugal section, and the high-temperature gas enters the centrifugal section; the metal condensed phase combustion product enters the centrifugal section, and under the action of centrifugal force, the metal condensed phase combustion product moves forward to a lower outlet of the separation section at the rear end and flows out; high-temperature fuel gas flows out from an upper outlet of the separation section.
The invention has the beneficial effects that: 1. the separation of the metal condensed phase combustion product and the high-temperature fuel gas in the metal powder combustion device is realized, and the separation efficiency of 80.3% of the metal condensed phase combustion product can be realized by the separation mode through experimental verification. 2. The device is small in size and convenient to use in experiments.
[ description of the drawings ]
FIG. 1 is a schematic structural diagram of a condensed-phase product separation device of a metal powder combustion device according to the present invention;
FIG. 2 is a movement track of a metal condensed phase combustion product in a separation section, which is obtained by numerical simulation.
Wherein: 1. a fluidized gas line; 2. an injector; 3. a combustion chamber; 4. an outlet section; 5. an upper outlet of the separation section; 6. a powder storage tank; 7. a piston; 8. a motor; 9. a plasma igniter; 10. a separation section; 11. an inlet arc segment; 12. a centrifugation section; 13. a lower outlet of the separation section.
[ detailed description ] embodiments
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The embodiment of the invention discloses a separation device for a metal powder condensed phase combustion product, which comprises the following components in percentage by weight as shown in figure 1: a combustion chamber 3 and a separation section 10 integrally connected and communicated in the axial direction; the front end of the combustion chamber 3 is used for being communicated with a powder supply system pipeline.
The separation section 10 is a chamber formed by a shell and comprises an inlet arc section 11, a centrifugal section 12 and an outlet section 4 which are communicated in sequence from front to back; in the inlet arc section 11, the upper wall of the inlet arc section is a downward curved arc wall surface from front to back; in the centrifugal section 12, the upper wall and the lower wall are all arc-shaped and bent downwards to form a concave cavity of the lower wall of the pipe body; the outlet section 4 comprises an upper separation section outlet 5 and a lower separation section outlet 13 which are arranged up and down and are independent of each other, the upper separation section outlet 5 and the lower separation section outlet 13 are both tubular bodies with open rear ends, and the front ends of the upper separation section outlet 5 and the lower separation section outlet 13 are both communicated with the centrifugal section 12. The upper outlet 5 of the separation section is inclined upwards from front to back.
Preferably, the inner diameter of the combustion chamber 3 is 50mm, and the radius R of the arc of the inlet arc segment 11 is 145 mm. The height H between the upper and lower lowest points of the centrifugal section 12 is 25 mm. The horizontal distance L between the lowest point of the centrifugal section 12 and the branching point of the upper and lower outlets of the outlet section 4 is 30 mm.
The powder supply system comprises a powder storage tank 6, wherein the powder outlet end of the powder storage tank 6 is communicated with the front end of the combustion chamber 3, and the powder outlet end of the powder storage tank 6 is also communicated with a fluidized gas pipeline and used for carrying metal particles into the combustion chamber 3. The bottom of the powder storage tank is coaxially provided with a piston 7, a motor 8 is arranged outside the powder storage tank, and the motor 8 is arranged on a connecting rod of the piston 7.
The invention also discloses a separation method of the metal powder condensed phase combustion product, which comprises the following steps: as shown in fig. 2, the metal powder in the powder storage tank 6 and the fluidizing gas 1 are uniformly mixed, enter the combustion chamber 3, and are combusted in the combustion chamber 3, the metal condensed phase combustion product generated after the combustion and the high-temperature gas enter the inlet arc section 11 of the separation section 1 and collide with the upper wall of the inlet arc section 11, the metal condensed phase combustion product moves forward in the direction of the lower wall surface of the centrifugal section 12 from the straight line, and the high-temperature gas enters the centrifugal section 12; the metal condensed phase combustion products enter the centrifugal section 12, and under the action of centrifugal force, the metal condensed phase combustion products advance to the lower outlet 13 of the rear separation section and flow out; the high-temperature fuel gas flows out from an upper outlet 5 of the separation section.
The upper outlet 5 of the separation section is a high-temperature gas outlet which is directly connected with other devices, such as a Stirling engine, and is used for driving to do work. The lower outlet 13 of the separation section is an outlet of the metal condensed phase combustion products, and the outlet is directly connected with a metal condensed phase combustion product collecting device.
The specific working process of the separation device for the condensed phase combustion products of the metal powder comprises the following steps:
the metal powder fuel 6 is driven by a motor 8 to meet the fluidizing gas 1, the fluidizing gas 1 is carried to an injector 2, the injected gas enters a combustion chamber 3, self-sustaining combustion is realized after the combustion chamber 3 is ignited by a plasma igniter 9, a metal condensed phase combustion product and high-temperature gas generated after combustion enter an inlet arc section 11 through a separation section inflow opening, the metal condensed phase combustion product collides with the wall surface of the inlet arc section 11 and rebounds to change the motion track, meanwhile, after the centrifugal action of a centrifugal section 12, the high-temperature gas flows out from an upper outlet of the separation section, most of the metal condensed phase combustion product flows out from a lower outlet 13 of the separation section, and therefore the effect of separating the metal condensed phase combustion product and the high-temperature gas is realized.
In order to verify the use effect of the device and the method, the following numerical simulation is carried out, wherein the separation device is adopted, and the components of the given metal condensed phase combustion product in the numerical simulation are respectively Fe and Fe2O3、FeO、Fe3O4The minimum particle size of the particles is 0.003mm, the maximum particle size is 0.11mm, the average particle size is 0.04864mm, the distribution index n is 2.049, and the number of particle sizes of the particles is 10; the wall surface is set as a rebound wall surface in numerical simulation, and the tangential rebound coefficient etPolynomial formula, normal coefficient of restitution enThe polynomial equation is:
et＝2.3661θ3-4.4071θ2+2.4851θ+0.1013；
en＝-1.2225θ3+4.5530θ2-5.5790θ+2.5266；
in the formula: theta is the angle between the incident particle and the wall surface, and is given by rad.
The movement locus of the metal condensed phase combustion product in the separation section 10 obtained by numerical simulation is shown in fig. 2. As can be seen from the figure, the metal condensed phase combustion products collide with the wall surface and rebound and then move to the lower outlet 13 of the separation section under the action of centrifugal force and inertia force, so that the collection of the metal condensed phase combustion products is realized; a very small amount of metal condensed phase combustion products are carried by the high temperature combustion gas to the upper outlet 5 of the separation section. The result shows that the separation mode can realize the separation of the metal condensed phase combustion product and the high-temperature fuel gas in the metal powder combustion device. After a plurality of times of simulation, the simulation is carried out,
in order to verify that the separation effect of the metal condensed phase combustion product can be realized, a metal powder condensed phase combustion product separation experiment is carried out, and iron powder is adopted as the metal powder fuel in the experiment. The rear end of the separation section 10 is connected with a collection section, and the purpose of the connection of the collection section is mainly to collect the iron condensed phase combustion products at the upper and lower outlets of the separation section 10 respectively, so that the separation efficiency of the separation mode is calculated.
In the experiment, the mass flow rate of the fluidizing gas was 1.9g/s, and the supply flow rate of the iron powder was 1.98 g/s. The device is suitable for metal particles with the particle size not less than 20 mu m. The iron powder provided by the powder supply system meets the fluidizing gas 1 through the fluidizing cavity, is uniformly mixed into a gas-solid two-phase fluid, then enters the head of the combustion chamber 3, meets flame guided by the plasma igniter 9, and is successfully ignited. The metallic condensed phase combustion products generated after combustion and high-temperature fuel gas enter the separation section 10 for separation, and the collection of the iron metallic condensed phase combustion products is realized through the collection section. After the experiment is finished, the experimental data is processed, as shown in table 1, and it can be known from the table that most of the iron powder condensed-phase combustion products entering the collection system enter the lower outlet 13 of the separation section after being rebounded with the inner wall surface of the separation section 10 for many times under the action of centrifugal force and inertia force, and then flow to the lower outlet collection section, so that the collection of the iron powder condensed-phase combustion products is realized; a very small amount of the iron condensed phase combustion products enter the upper outlet 5 of the separation section. The experimental result shows that a small amount of deposition exists in the separation section 10, which is mainly caused by the fact that the graphite element in the separation section 10 is formed by splicing an upper section and a lower section in the machining process, a certain gap exists at the splicing position, iron powder condensed phase combustion products can be embedded in the spliced gap when moving in the separation section, meanwhile, a small amount of iron powder condensed phase combustion products can be adhered to the inner wall surface of graphite, and finally, a small amount of deposition exists in the separation section 10.
TABLE 1 Experimental data
The invention adopts the following formula to calculate the collection efficiency of the metal condensed phase combustion product, and the finally calculated collection efficiency of the iron condensed phase combustion product is 80.3 percent, which shows that the separation mode in the metal powder combustion device can realize the separation efficiency of the metal condensed phase combustion product of 80.3 percent. The calculation is as follows;
Claims (7)
1. an apparatus for separating condensed phase combustion products of metal powders, comprising: a combustion chamber (3) and a separation section (10) which are integrally connected and communicated along the axial direction; the front end of the combustion chamber (3) is communicated with a powder supply system pipeline;
the separation section (10) is a cavity formed by a shell and comprises an inlet circular arc section (11), a centrifugal section (12) and an outlet section (4) which are communicated in sequence from front to back; in the inlet arc section (11), the upper wall of the inlet arc section is a downward curved arc wall surface from front to back; in the centrifugal section (12), the upper wall and the lower wall of the centrifugal section are all arc-shaped and bent downwards to form a concave cavity of the lower wall of the pipe body; the outlet section (4) comprises an upper separating section outlet (5) and a lower separating section outlet (13) which are arranged up and down and are independent of each other.
2. The device for separating metallic powder condensed-phase combustion products as claimed in claim 1, wherein the combustion chamber (3) has an inner diameter of 50mm, and the radius R of the arc of the inlet arc segment (11) is 145 mm.
3. The device for separating metallic powder condensed-phase combustion products as set forth in claim 1 or 2, wherein the height H between the upper and lower lowest points of the centrifugal section (12) is 25 mm.
4. A device for separating metallic powder condensed-phase combustion products according to claim 3, wherein the horizontal distance L between the lowest point of the centrifugal section (12) and the branch point of the upper and lower outlets of the outlet section (4) is 30 mm.
5. A device for the separation of metallic powder condensed-phase combustion products according to claim 4, characterized in that the upper outlet (5) of the separation section is inclined upwards from front to back.
6. A device for the separation of metallic powder condensed-phase combustion products according to claim 5, wherein the powder supply system comprises a powder tank (6), the powder outlet end of the powder tank (6) is connected to the front end of the combustion chamber (3), and the powder outlet end of the powder tank (6) is also connected to the fluidized gas pipeline (1) for carrying metallic particles into the combustion chamber (3).
7. A method of separating a metallic powder condensed-phase combustion product according to any one of claims 1 to 6, characterized in that the method of separating is as follows: metal powder in the powder storage tank (6) and fluidized gas (1) are uniformly mixed and enter the combustion chamber (3) to be combusted in the combustion chamber (3), a metal condensed phase combustion product generated after combustion and high-temperature gas enter an inlet arc section (11) of a separation section (10) to collide with the upper wall of the inlet arc section (11), the metal condensed phase combustion product is changed from straight running to advance towards the direction of the lower wall surface of the centrifugal section (12), and the high-temperature gas enters the centrifugal section (12); the metal condensed phase combustion products enter the centrifugal section (12), and under the action of centrifugal force, the metal condensed phase combustion products advance to the lower outlet (13) of the separation section at the rear end and flow out; and the high-temperature fuel gas flows out from an upper outlet (5) of the separation section.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4089665A (en) * | 1976-09-04 | 1978-05-16 | Burvell Canada Company Limited | Deflecting means |
| CN87103148A (en) * | 1986-04-30 | 1987-11-11 | 燃烧工程有限公司 | Fluidized bed combustor with integral solids separator |
| JP2001341840A (en) * | 2000-06-05 | 2001-12-11 | Kioritz Corp | Separator for particle carrier |
| CN101716683A (en) * | 2009-11-27 | 2010-06-02 | 西安慧维纳米金属材料有限公司 | Equipment and method for producing high-purity nano-metal ultrafine powder |
| CN108413431A (en) * | 2018-03-30 | 2018-08-17 | 烟台龙源电力技术股份有限公司 | Boiler oil pretreatment unit and boiler |
| CN110260361A (en) * | 2019-07-11 | 2019-09-20 | 南昌航空大学 | It is a kind of using metal powder as the after-burner of fuel |
-
2020
- 2020-03-31 CN CN202010246880.6A patent/CN111298522A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4089665A (en) * | 1976-09-04 | 1978-05-16 | Burvell Canada Company Limited | Deflecting means |
| CN87103148A (en) * | 1986-04-30 | 1987-11-11 | 燃烧工程有限公司 | Fluidized bed combustor with integral solids separator |
| JP2001341840A (en) * | 2000-06-05 | 2001-12-11 | Kioritz Corp | Separator for particle carrier |
| CN101716683A (en) * | 2009-11-27 | 2010-06-02 | 西安慧维纳米金属材料有限公司 | Equipment and method for producing high-purity nano-metal ultrafine powder |
| CN108413431A (en) * | 2018-03-30 | 2018-08-17 | 烟台龙源电力技术股份有限公司 | Boiler oil pretreatment unit and boiler |
| CN110260361A (en) * | 2019-07-11 | 2019-09-20 | 南昌航空大学 | It is a kind of using metal powder as the after-burner of fuel |
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Application publication date: 20200619 |