CN105637109A

CN105637109A - Thermal spraying device

Info

Publication number: CN105637109A
Application number: CN201480056851.6A
Authority: CN
Inventors: 本田和宽; 笹谷佳宽
Original assignee: Krosaki Harima Corp
Current assignee: Krosaki Harima Corp
Priority date: 2013-12-11
Filing date: 2014-11-07
Publication date: 2016-06-01
Also published as: JP5767689B2; JP2015113490A; KR20160038042A; WO2015087642A1

Abstract

The present invention provides a thermal spraying device with which ignition can be prevented when a large amount of spraying occurs. This thermal spraying device is provided with multiple dispensing units that dispense a raw material powder, with each dispensing unit being connected to a mixture generation means that forms a mixture by mixing a carrier gas and the raw material powder dispensed by the dispensing unit, and a spraying means (40) that sprays the mixture generated by the mixture generation means. The center-to-center distance between the spray holes (41) of these spray means (40) is 1.4-5.3 times the inner diameter of the spray holes (41).

Description

Hot spray apparatus

Technical field

The present invention relates to the hot spray apparatus for forming refractory compositions.

Background technology

In the past, as being used for being formed the hot spray apparatus of refractory compositions, it is known to melt, by utilizing the carrier gas (oxygen) of combustion-supporting property that the raw material powder body comprising flammable powder body (such as metal dust) and fire resistance powder body (fire resistance aggregate) is carried and sprayed and then light a fire, the hot spray apparatus (such as patent documentation 1) forming refractory compositions.

Specifically, patent documentation 1 describes and has techniques below, namely, jetting nozzle is utilized to be directed in ejector by carrier gas, in ejector, raw material powder body and carrier gas are mixed, mixed mixture is directed to downstream along stream, utilizes injection unit that mixture is sprayed, and make the burning of the mixture after injection form refractory compositions.

Additionally, as other plasma spray technology, it is known to the technology (referring for example to patent documentation 2) of refractory body back boxing is repaired by flame gunning method (flame spraying). Specifically, in patent documentation 2 describe have from stove underneath towards rifle inserted above to carry out the technology of thermal spraying.

Patent documentation 1: Japanese Unexamined Patent Publication 2013-043141 publication

Patent documentation 2: Japanese Laid-Open Patent Publication 58-43385 publication

Summary of the invention

In such plasma spray technology, in order to effectively and rapidly form the refractory compositions as target, and more injection is needed to constitute the emitted dose of raw material powder body on basis of refractory compositions. Additionally, when more spraying raw material powder body, it is necessary to little by the heap width in construction surface, and need to by construction surface, injected raw material powder body is smoothly carried out construction. At this, heap width refer to by raw material powder body to during by construction surface thermal spraying to the greatest length by the width of the melt-coating part of construction surface. Wide more big owing to piling, tailed off by the deposition amount of the per unit area of construction surface, it is therefore desirable to heap is wide little.

Hereinafter, in this manual, the injection of construction many for the emitted dose of raw material powder body, that heap width is little, realization is smooth is called a large amount of injection. When spraying in a large number, the ratio (hereinafter referred to as " gas-solid ratio ") increasing the raw material powder body in mixture is effective. But, when increasing gas-solid ratio, then the frequency that raw material powder body rubs against one another uprises, and the danger resulting in ignition uprises.

Therefore the technical problem to be solved is to provide a kind of hot spray apparatus being prevented from producing ignition when carrying out injection in a large number.

A viewpoint according to the present invention, it is provided with a kind of hot spray apparatus, it is for being mixed with the raw material powder body comprising fire resistance powder body and flammable powder body, and the mixture of the carrier gas of combustion-supporting property carries out spraying and make it to burn and forms the hot spray apparatus of refractory compositions, it is characterized in that, there is the output portion of the described raw material powder body of multiple output, in respective output portion, it is connected to and the raw material powder body exported from this output portion and described carrier gas are mixed the mixture generation unit forming described mixture, and to generating unit by this mixture and injection unit that the described mixture that generates sprays forms, and more than 1.4 times of the internal diameter that the centre-to-centre spacing of the jet of these injection units is described jet less than 5.3 times.

In the present invention, it is preferred to the injection direction of described injection unit is, it it is more than 50 degree less than 95 degree relative to the straight line between the center of the described jet of link.

According to the present invention, by arranging the output portion of multiple output raw material powder body, injection unit is connected with each output portion, and the configuration of the jet of each injection unit is optimized, it is possible to carry out a large amount of injection without increasing gas-solid ratio. Additionally, due to gas-solid ratio need not be increased, therefore, it is possible to prevent ignition.

Accompanying drawing explanation

Fig. 1 indicates that the schematic diagram of an embodiment of the hot spray apparatus of the present invention.

Fig. 2 indicates that the sectional view of the configuration example of thermal spraying machine main body.

Fig. 3 indicates that the schematic diagram of the position relationship of the jet of injection unit.

Fig. 4 indicates that the explanation figure of the injection direction of injection unit.

Fig. 5 indicates that the schematic diagram of the major part of other embodiment of the hot spray apparatus of the present invention.

Fig. 6 indicates that the explanation figure piling wide concept.

Detailed description of the invention

Fig. 1 indicates that the schematic diagram of an embodiment of the hot spray apparatus of the present invention. With the hot spray apparatus of figure, there are 2 thermal spraying machine main bodys 10, and injection unit 40 is connected with each thermal spraying machine main body 10 via delivery hose 20 and rifle 30. Each injection unit 40 has jet 41. These jet 41 is collocated in the horizontal direction, and its internal diameter is identical.

Fig. 2 indicates that the sectional view of the configuration example of thermal spraying machine main body 10. Possess the hopper 11 as the storage unit storing raw material powder body A with the thermal spraying machine main body 10 shown in figure and generate the ejector 12 of unit as mixture.

Raw material powder body A comprises flammable powder body (such as metal dust) and fire resistance powder body (fire resistance aggregate) forms. Hopper 11 has the output portion 11a of output raw material powder body A on its bottom. Ejector 12 utilizes the flowing of pressurized carrier gas (oxygen) to suck raw material powder body A from output portion 11a, and carrier gas and raw material powder body A are mixed and form mixture.

Ejector 12 possesses the container part 12a with inner space connected with the output portion 11a bottom hopper 11, pressurized carrier gas sprayed from top to the inner space of container part 12a tapered jetting nozzle 12b and the discharge conduit 12c that one end connects with the inner space of container part 12a and guided from described one end to the other end along stream by described mixture. Namely, in the inner space of container part 12a, carrier gas with ejection at a high speed, thus makes the inner space of container part 12a form negative pressure (in this case more less pressure than atmospheric pressure) from the nozzle bore on tapered jetting nozzle 12b top towards one end (cardinal extremity) of discharge conduit 12c. On the other hand, via vertical tranporter 11b, the inner space of output portion 11a and the container part 12a of hopper 11 connects. Therefore ejector 12 utilizes the flowing of pressurized carrier gas that raw material powder body A is drawn into the inner space of container part 12a from output portion 11a, and the carrier gas sprayed from the nozzle bore on jetting nozzle 12b top and raw material powder body A are mixed the inner space of container part 12a and form mixture.

This mixture is fed into delivery hose 20 via horizontal conveying pipe 13, and the rifle 30 being situated between as shown in Figure 1 is fed into injection unit 40 further, and sprays from the jet 41 of injection unit 40 towards by construction surface B. Alternatively, it is also possible to omit horizontal conveying pipe 13, and the outlet side of delivery hose 20 with ejector 12 is directly connected to.

Fig. 3 indicates that the explanation figure of the position relationship of the jet 41 of injection unit 40. In the present invention, the centre-to-centre spacing L of jet 41 is set as more than 1.4 times less than 5.3 times of the internal diameter D of jet 41. When L is more than 5.3 times of D, then cannot realize a large amount of injections as target. That is, when L is more than 5.3 times of D, then become and carry out the independent state sprayed close to by the raw material powder body sprayed from each jet 41 relative to by construction surface, thus a large amount of injection cannot be realized. On the other hand, due to as the restriction in the design of real machine, therefore make L be D more than 1.4 times. That is, as in the design of real machine, by injection unit 40 near and carry out configuration and have the limit.

The internal diameter of substantially each jet 41 is identical in the present invention. This is owing to then cannot be carried out uniform thermal spraying when the internal diameter difference of each jet 41. But, if the degree that the uniformity of thermal spraying is not compromised, then the internal diameter of each jet 41 can also be how many different. Now, the internal diameter D used when the centre-to-centre spacing L of jet 41 being carried out regulation can be the meansigma methods of the internal diameter of each jet 41.

Equally, from the uniformity this point guaranteeing thermal spraying, each jet 41 essentially configures as shown in Figure 3 side by side. But, its direction arranged side by side can be vertical or incline direction.

Fig. 4 indicates that the explanation figure of the injection direction of injection unit 40. In the present invention, it is preferred to the injection direction of injection unit 40 is, it it is more than 50 degree less than 95 degree relative to the straight line between the center of link jet 41. Namely, it is preferable that the angle, �� shown in Fig. 4 is more than 50 degree less than 95 degree. The present invention, from realizing a large amount of injection this point as target, does not imagine this angle, �� more than 90 degree. But, when consider design on restriction and make on error time, then permissible range is to 95.

Additionally, the present invention is from realizing a large amount of injection this point as target, it is preferable that angle, �� is set as being focused on construction surface B on a bit from the raw material powder body of each jet 41 injection. Condition for this is, when the distance till making by construction surface is R, then below formula (1) is indicated.

R=0.5L tan �� ... (1)

At this, it is generally 50��200mm to by the distance R construction surface. Although additionally, the centre-to-centre spacing L of jet 41 is changed because of the internal diameter D of jet 41, but D generally corresponds to 10A (12.7mm) to 15A (16.1mm). Now, the maximum of the centre-to-centre spacing L of jet 41 becomes 16.1 �� 5.3=85.3mm, and when the distance R till making by construction surface is minimum 50mm, then angle, �� becomes 50 degree by above formula (1). Thus it is preferred to angle, �� is more than 50 degree.

Additionally, be provided with 2 thermal spraying machine main bodys 10 in the embodiment of figure 1, but 1 thermal spraying machine main body 50 can be merged into as shown in Figure 5. That is, the hopper 51 of the storage unit as storage raw material powder body A arranges 2 output portion 51a, and the ejector 52 generating unit as mixture is connected with respective output portion 51a. The composition of ejector 52 can be identical with the ejector 12 shown in Fig. 2. But, in the present invention, mixture generates unit and is not limited to ejector. Although ejector also has the effect attracting raw material powder from output portion, but when using the mixture beyond ejector to generate unit, it is also possible to the output unit such as rotary feed table, screw feeder is set in output portion.

Embodiment

Testing with the hot spray apparatus of Fig. 1, while confirming with or without ignition, flatness and heap width to construction body have been evaluated. Table 1 illustrates its result.

Table 1

In test, employ by the silicon dioxide (SiO as fire resistance powder body₂): the raw material powder body (particle of below 0.1mm: 20 mass %) that 85 mass % and the metal Si:15 mass % as flammable powder body are constituted, and by making the carrier gas (oxygen) of 0.5MPa flow through, raw material powder body has been sprayed. It addition, in comparative example 1 and comparative example 2, only use the thermal spraying machine main body 10 of side to spray from 1 injection unit 40 in the hot spray apparatus of Fig. 1.

Except comparative example 2, the emitted dose of raw material powder body is every 1 50kg/h of thermal spraying machine main body, and comparative example 2 is 100kg/h. The internal diameter of jet 41 of injection unit 40, the centre-to-centre spacing of jet 41, thermal spraying distance (illustrated in fig. 4 to by the distance R construction surface) and spray angle (angle, �� illustrated in fig. 4) are as shown in table 1.

For with or without ignition, confirming have no-spark to produce near injection unit 40 with range estimation. If there being ignition, then its spark develops in delivery hose 20 and rifle 30, may identify near injection unit 40.

For the flatness of body of constructing, concavo-convex when construction body is then evaluated as outstanding (��) when being sized to below 3mm, then evaluates as well (zero) when more than 3mm and for below 5mm.

Heap width refer to as shown in Figure 6 by injection unit (injection nozzle) move to a direction and meanwhile when carrying out thermal spraying to the greatest length by the width of the melt-coating part of construction surface, wide as 100 using the heap of comparative example 1, the heap width of each example has been carried out index conversion. Its heap is wide more big then more few by the deposition amount of the per unit area of construction surface, is evaluated as in this test, when heap is wide with index scaled value for then failing to obtain the effect of a large amount of injection during more than 150.

As shown in table 1, the embodiment 1��8 being within the scope of the invention is all unconfirmed to ignition, and flatness is also good. Additionally, pile wide for less than 150, have also been obtained the effect of a large amount of injection.

The injection unit 40 of comparative example 1 is 1, and emitted dose is 50kg/h, is not the example of a large amount of injection. Comparative example 2 is injection unit 40 is 1, and makes emitted dose increase to the example of 100kg/h, but creates ignition owing to gas-solid ratio is big.

Comparative example 3 is the example that the centre-to-centre spacing of jet 41 is excessive, and piling wide is 180 effects failing to obtain a large amount of injection. Comparative example 4 is example that spray angle is less than 50 degree 44 degree. Now, before arriving by construction surface B, the raw material powder body of injection mutually collides and produces to disperse. Therefore, piling wide is 210, and fails to obtain the effect of a large amount of injection.

The plasma spray technology of the present invention can be used for coke oven, converter, calciner, AOD furnace, ladle, cast dish, vacuum degassing furnace, torpedo car (torpedocar), electric furnace, incinerator, electric induction furnace, heating furnace, glass furnace etc. and uses the Industrial Stoves etc. of the thermal spraying containing flammable metal-powder.

Symbol description

10-thermal spraying machine main body; 11-hopper; 11a-output portion; 11b-vertical tranporter; 12-ejector (mixture generation unit); 12a-container part; 12b-jetting nozzle; 12c-discharge conduit; 13-horizontal conveying pipe; 20-delivery hose; 30-rifle; 40-injection unit; 41-jet; 50-thermal spraying machine main body; 51-hopper; 52-ejector; A-raw material powder body; B-is by construction surface.

Claims

1. a hot spray apparatus, it is that the mixture to the carrier gas being mixed with raw material powder body and the combustion-supporting property comprising fire resistance powder body and flammable powder body sprays and makes it burn and forms the hot spray apparatus of refractory compositions, it is characterised in that

There is the output portion of the described raw material powder body of multiple output,

In respective output portion, it is connected to and the raw material powder body exported from this output portion and described carrier gas are mixed the mixture forming described mixture generates unit and to generating unit by this mixture and injection unit that the described mixture that generates sprays forms

And more than 1.4 times of the internal diameter that the centre-to-centre spacing of the jet of these injection units is described jet less than 5.3 times.

2. hot spray apparatus according to claim 1, it is characterised in that the injection direction of described injection unit is, is more than 50 degree less than 95 degree relative to the straight line between the center of the described jet of link.