CN85106441A - Be used for removing the method and apparatus of the remaining sludge of nuclear boiler - Google Patents

Abstract

A kind of sludge spray eliminating method comprises provides a spray tip and a barrier nozzle.They clean and the barrier jet flow along each self-emission liquid of two paths between the heat exchange array in the nuclear boiler jar, and these two paths are two pipe row at least at interval.The barrier jet flow prevents that the sludge that is eliminated is displaced sideways, and enters the previous zone of cleaning by the barrier jet flow.Jet flow can be rotated between tube sheet center and periphery.The barrier nozzle comprises that 3 are arranged in angled jet each other, to increase the coverage of barrier path.

Description

Be used for removing the method and apparatus of the remaining sludge of nuclear boiler

Generally speaking, the present invention relates to the method and apparatus that a kind of sludge spray removes, this method and apparatus is applicable to removes the sludge that is deposited on the nuclear boiler tube sheet.The present invention has special effect to the remaining sludge that removing is deposited on the nuclear generation organ pipe plate.

Typical nuclear boiler comprises a vertical orientated shell and a large amount of inverted-loop tube, and these inverted U-shaped types are installed in the shell, form a tube bank.Every pipe all has a pair of elongated vertical component, and the sweep in the upper end with an arc is connected, and the vertical component that makes every pipe is on central passage or path by tube bank.Stipulate the size of these pipes and arranged, like this on each limit of central passage or path.The stretching, extension that is perpendicular to one another with row of parallel row that the vertical component of pipe is all separated by interchannel and the array of forming by the parallel columns that channel spacing is opened, row.

Tube sheet is at the vertical component of the lower end of all pipes stay pipe.Link with primary liquid input pressure charging system in central passage vertical tube part on one side.Vertical tube part at the central passage another side then connects mutually with primary liquid output pressure charging system.Pass through reactor core, the primary liquid that has been heated through circulation, via primary liquid input pressure charging system, enter steam generator, be transmitted through tube bank thereafter, flow out from primary liquid output pressure charging system, meanwhile, secondary liquid or feed water are around all pipe circulations of tube sheet top, with the outside generation heat interchange of all pipes, make a part of feed water convert steam to, these steam then circulate in the standard Blast Furnace Top Gas Recovery Turbine Unit (TRT).

The principal ingredient of sludge is the compound of iron oxide and copper, also has other metals of trace in addition, and this sludge is deposited on the tube sheet from feed water.Sludge is deposited as phosphate solution or the gathering of other mordant on tube wall provides the place, and the result makes the pipe attenuation.Therefore, must periodically eliminate sludge.

A kind of known method of removing sludge is called sludge spray gun-pipette method.Sludge spray removes and comprises and use water under high pressure to dissolve and mixes sludge, and use suction pipe and filtration unit, for water-sludge potpourri is removed in processing or recycle.Spray gun emission high-speed water jet or jet flow, this jet flow is vertical substantially with the direction of motion of spray gun, promptly is parallel to the pipe row.

To be approximately 1 inch or thicker sludge very suitable to removing thickness on the tube sheet for this method.This is because thicker sludge layer limit injection stream is diffused into processed path, and for instance, if removed 6 inches thick sludges, half inch to the 1 inch remaining sludge of thick not removing just may be inessential so.Yet if initial sludge thickness is 1 inch or thinner, half inch thick layer expression only has 50 percent sludge to obtain removing so.It is difficult removing this remaining sludge, because sludge spray gun jet easily the sludge particle lateral scattering that is purged to the zone of having cleaned, rather than the sludge particle delivered to the periphery of tube sheet downwards along the pipe path, sludge is transported to suction pipe and emits by neighboring liquid stream.

For removing the remaining sludge layer in the steam generator, be necessary to provide a kind of improved sludge spray eliminating method and device, the shortcoming of all kinds of method and apparatus before this improved method and apparatus should be avoided, structurally going up with operation simultaneously increases new advantage.

The present invention is intended to provide measure for sludge spray removal apparatus and method, and the sludge lateral scattering that prevents from effectively to be become to removing is to the tubesheet region that had been cleaned, and improved method not only simply but also economical, can be removed technology and device compatibility mutually with present spray.

The present invention comprises a kind of method from saying of its broad sense in form, this method is used to remove the sludge deposition on the nuclear boiler jar tube sheet, the nuclear boiler jar is connected with a tube bank that is arranged in the parallel heat transfer tubes that parallel row that is separated by interchannel and the parallel columns of being opened by channel spacing form, and this method comprises the steps: to make a branch of liquid to clean jet flow and injects first path.Drive away sludge precipitation wherein, and precipitation is shifted to the periphery of tube bank; The liquid barrier jet flow is injected with first path managed second path that is listed as in two at interval at least, prevent to be entered the path that had cleaned by the barrier jet flow by the sludge that becomes to removing; And remove the liquid be loaded with sludge from the perimeter rows of tube bank.

From to can more at large understanding the present invention the explanation of next most preferred embodiment, most preferred embodiment can be read and understands with accompanying drawing herein:

Fig. 1 is the fragmentary, perspective view of the part of nuclear boiler jar, and the part of cutting open illustrates the embodiment of spray eliminating method of the present invention and device;

Fig. 2 is the horizontal part sectioned view of the amplification of Fig. 1 nuclear boiler jar, with plan view from above explanation tube sheet;

Fig. 3 is the amplification sketch that removal apparatus is sprayed in the present invention, and this figure generally intercepts along the 3-3 line of Fig. 2, and has shown liquid jet;

Fig. 4 is the further enlarged side view along the sludge spray removal apparatus nozzle system of the 4-4 line intercepting of Fig. 2;

Fig. 5 is the horizontal sectional drawing along the 5-5 line intercepting of Fig. 4;

Fig. 6 is the vertical cross section along the 6-6 line intercepting of Fig. 5;

Fig. 7 is the vertical cross section along the 7-7 line intercepting of Fig. 5;

Fig. 8 is the skeleton view of the sludge spray removal apparatus nozzle holder of Fig. 6;

Fig. 9 is the local elevation view that couples between gun shot of the present invention and the nozzle system.

Fig. 1 and Fig. 2 have illustrated that general this jar generally includes an elongated cylindrical tank skin 11 with the numeral 10 nuclear boiler jars of representing, contiguous jar 10 lower end, cross-section extension and sealing tank skin 10 be a circular tube sheet 12.Inspecting hole or viewport 14 and 15 are arranged on the tank skin 11, and their position is a little more than tube sheet 12 planes, but the mutual alignment radially fully relatively.Be installed on the tube sheet 12 be the tube bank, generally represent with number 16.Tube bank 16 comprises that a large amount of heat-transfer pipe 17(quantity reaches about 7,000), every heat-transfer pipe all is to be inverted U-shaped usually.Pipe 17 vertical component is arranged in the row 18 that is parallel to each other and the array of row 19, and row 18 is by in the ranks passage 20 is spaced apart, row 19 then between quilt path 21 spaced apart.All on the central passage 22 of a broad, passage 22 radially extends through tube sheet 12 and harmonizes with inspecting hole 14 and 15 vertical component of every pipe 17.It would be desirable that a suction lift 23 is installed in the inspecting hole 15, and a peripheral liquid flow injection head (not marking) is provided, cleaning liquid and the sludge particle that mixes up are flowed along the periphery of tube sheet 12 in the known manner, and discharge by suction lift 23.

A liquid spray gun (representing with numeral 25 usually) is installed on the nuclear boiler jar 10 is used to remove the sludge on the tube sheet 12 between the row and column that accumulates in pipe 17.Liquid spray gun 25 is installed on the tank skin 11 of contiguous inspecting hole 14 by a suitable mounting structure (not marking), and this spray gun 25 is substantially as at United States Patent (USP) the 4th, 273, the sort of type that discloses in No. 076.As with reference in conjunction with having introduced the situation of above-mentioned patent, therefore, those structures of only just understanding liquid spray gun 25 essential to the invention are below described in detail herein.

Liquid spray gun 25 comprises an elongated tubular arm 26, and this tubular arm is positioned at the radial orientation of tube sheet 12 substantially, run through by inspecting hole 14 along central passage 22, and homocentric with inspecting hole.Tubular arm 26 has the cylindrical cavity 27 that runs through along its length direction, presses known way and transmits spray except that liquid.Preferably arrange spray gun 25 to such an extent that to make tubular arm 26 serve as that axle rotates by known way with its length direction also.A ratch 28(Fig. 9 who places along its length direction can be housed in the tubular arm 26), it matches with pinion wheel (not marking) in the mounting structure, and tubular arm 26 is stretched out and indentation.

With reference now to Fig. 3, to Fig. 9, what be coupled that device 29 is fixedly mounted on tubular arm 26 ends is nozzle system 30.Nozzle system 30 comprises that elongated, its xsect is the conduit 31 of rectangle, also comprise a cylindrical cavity 32, this cylindrical cavity 32 is along the length direction of conduit 31, from the one end extend and terminate in another blind end 33 on the position of small distance very.The outside surface of blind end 33 can tapered (as shown in 34), also can be general prismatic.That in conduit 31, form and with axial cylindrical shape cavity 32 interrelate be two apart from v notch v or groove 35 and 36, it is spaced apart that they press preset distance at conduit 31 length directions.

With the opening end one of conduit 31 and the part that protrudes from its end be tubulose extension 37, it and cylindrical cavity 32 are coaxial, its internal diameter basically with spray gun tubular arm 26 in the internal diameter of cylindrical cavity 27 and the internal diameter of cylindrical cavity 32 equate.Extension 37 is installed in the hookup 29, makes cylindrical cavity 27 and 32 coaxial, and the opening end of conduit 31 is connected with the end of spray gun tubular arm 26.The opening end of adjacent pipes 31 also fixedly mounts thereon, parallel with extension 37 and be an elongated registration arm 38 from the part that the opening end of conduit 31 protrudes, it has elongated groove 39, this groove extends along its length from its end, during use, groove 39 is fit to admit the abutting end of spray gun tubular arm 26 upper rails 28, and conduit 31 phase time tubular arms 26 are accurately located.

Attach on the conduit 31 spray tip 40 and a barrier nozzle 50 are arranged, they comprise the nozzle holder 41 and 51 in the groove 35 and 36 that can be installed in conduit 31 separately respectively, in more detail, regulation nozzle holder 41 and 51 size and to its processing, they are cooperated admirably with groove 35 and 36, like this, nozzle holder 41 and 51 outside surface flush with the outside surface of conduit 31 basically. Nozzle holder 41 and 51 can be fixed on the correct position by fillet welding.

With reference to spray tip 40, nozzle holder 41 is held within it has an arc groove 43 in more detail, the part of the duct cavity 32 that the sealing of its width and perfect and breach 35 intersect.Same in nozzle holder 41, form, extend laterally and with groove 43 and duct cavity 32 vertical relevant cylindrical channels 44 in addition.Or rather, passage 44 has the main chamber 45 of a diameter less than groove 43 diameters, and the outer end in main chamber 45 links by the discharge unit 48 of a frustum part 47 and a minor diameter.During use, cleaning liquid (can be water) flows through spray gun arm 26 and duct cavity 32, sees Fig. 2 and Fig. 6 from passage 44 and a branch of thin narrow high-pressure wash jet 49(of discharge unit 48 ejaculations).

Equally, also there is an arc groove 53 nozzle holder 51 the inners, and its width and position can be sealed and improve and the part of the duct cavity 32 that breach 36 intersects.In nozzle holder 51, form and extend laterally and in addition cylindrical channel 60 relevant with duct cavity 32 perpendicular with arc groove 53.Passage 60 comprises a fan-shaped pressure charging system 61 of outwards dispersing, and the diameter of its circular the inner is less than the diameter of arc groove 53.What interrelate with the outer end of increase system 61 is three floss holes 63,64 and 65, and each floss hole all comprises the frustum part 66 of outside contraction and the cylindrical discharge part 67 of minor diameter.Three floss holes 63 to 65 are launched high- pressure spray 69a, 69b and 69c respectively, form a barrier jet flow 69(jointly and see Fig. 2 and Fig. 3).Floss hole 64 preferably is installed on the radially extended position of axle of duct cavity 32, and the axle of the axle of floss hole 63 and 65 and floss hole 64 intersects, lay respectively on the axle of floss hole 64 and under about 20 positions of spending.

Further referring to figs. 2 and 3, will illustrate that now the present invention uses the spray eliminating method of spray gun 25 and nozzle system 30.Spray gun 25 inserts in the steam generator jar 10 by inspecting hole 14.The position changes with the designing requirement with steam generator jar 10 of the distance of tube sheet 12 above tube sheet 12, does not wait from several inches to about 3 inches.Spray gun 25 with reserve to nozzle system 30 put into central passage 22.Make and clean and barrier jet flow 49 and 69 sensing one side.Cleaning liquid (for example water) is introduced spray gun 25.By liquid (water) being sprayed with the perpendicular nozzle 40 and 50 of central passage 22.

Spray removes the operation starting just cleaning in 49 first paths of injecting between two row of heat-transfer pipe 17 21.Spray gun 25 advances or dislocation to its center in the radial position of tube sheet 12 then, and a path advances at every turn.Removed half of one side of steam generator jar 10 up to spray.Or rather, spray gun 25 preferably advances always, moves past tube sheet 12 centers and arranges path again up to cleaning jet flow 49, and at this moment, barrier jet flow 69 is basically in the center of tube sheet 12.

When being placed in nozzle 40 and 50 on the conduit 31, must be noted that not make nozzle 40 and 50 at a distance of too closely or too far away.If they are at a distance of too near, sludge particle possible speed scattering, that be purged is too fast on the path 21 that is cleaned, to making barrier jet flow 69 can't change its direction and being stopped.If nozzle 40 and 50 is at a distance of too far away, the sludge particle that is purged may just be deposited on before reaching barrier jet flow 69 on the tube sheet 12, and in this case, the effect of barrier jet flow 69 will be cleaned jet flow as second.

To change with the designing requirement and the systematic parameter of nuclear boiler jar 10 in the optimal spacing of cleaning between jet flow 49 and the barrier jet flow 69.This at interval can be in the scope of 2 to 20 tube pitch, but is typically 2 or 3 tube pitch (one of them tube pitch is exactly two centre distance between the adjacent tubes row 19).Yet in this most preferred embodiment, known optimal spacing is 3 tube pitch, just between cleaning and barrier jet flow 49 and 69 two pipe paths 21 is arranged.The effect of barrier jet flow 69 is to set up barrier, stops the lateral scattering of being removed or cleaning the sludge particle of jet flow 49 expelings by spray, makes these particles do not reflected back the part that tube sheet 12 has been cleaned.

People know that spray gun arm 26 can (Fig. 2) rotate around its radial axle " X ", cause that simultaneously nozzle system 30 rotates.When spray gun 25 is installed in tube sheet 12 tops greater than 10 inches position, can utilize this rotation, guarantee complete covering to pipe path 21.Or rather, the most effective cleaning is to reach when jet or jet flow 49 are penetrated on the sludge layer on tube sheet 12 cleaning.So in order to drive away the sludge on path 21 total lengths effectively, near the sludge in path tube sheet 12 centers particularly is necessary to make and cleans jet flow 49 scannings, from the lateral edge of central passage 22 radially outwardly near the periphery of tube sheet 12.Preferably control the rotation of spray gun arm 26, like this, be mapped on the tube sheet 12 approximately during from its position of peripheral 8 inches when cleaning jet flow 49, this scanning motion stops at once.Do not wish to move on on any more position near tube sheet 12 peripheries cleaning a jet flow 49, this is because under the sort of situation, and jet flow 49 can stop around the flushing of periphery or drainage flow near suction lift 23.Spray gun arm 26 carries out from the best speed with about 3 degree of per second of the peritropous rotation in the center of tube sheet 12.People know, spray tip 40 and barrier nozzle 50 all rotate on spray gun arm 26 simultaneously, cause barrier jet flow 69 with the speed outwardly radial scan identical with cleaning jet flow 49.

Barrier nozzle 50 can be furnished with any amount of discharging jet.But the performance of having found three discharging jets is best.As very easily as seen from Figure 3, the action of these three jet 69a to 69c provides a fan-shaped barrier jet flow 69, barrier jet flow 69 is penetrated on tube sheet 12 along the physical length of pipe path 21, relative to guarantee forming with cleaning jet flow 49 sides, lag behind a little in advance or a little and clean effective barrier of jet flow 49.Also can use flute profile floss hole replace three independently floss hole 63 to 65 but find that these three independently floss hole 63 to 65 effects are better as barrier nozzle 50.Can also use more than three jets and form barrier jet flow 69.But be to use jet many more, current are also just big more, and the degree of depth that must make whole water on the tube sheet 12 is less than 4 inches.Therefore, people wish that the jet quantity in the barrier nozzle 50 reduces to minimum, and people find that also for example using, 5 jets can make performance obviously be improved unlike 3 jets of use.

To this, it is found that with regard to cleaning efficiency.Nozzle 40 and 50 flow rate are more important than water speed, and each nozzle 40 and 50 flow rate depend on the designing requirement of steam generator jar 10 and special nozzle arrangements, can not wait between about 30 gallons of the per minute for about 5 gallons at per minute.Yet for most preferred embodiment disclosed herein.The best overall flow rate that has been found that two nozzles is about 12 gallons an of per minute, and error is per minute+5.0 gallon or-0.5 gallon.

In this most preferred embodiment, each nozzle passage 44 and 60 total length are at least 0.65 inch, and preferably are about 1 inch, to guarantee to clean and barrier jet flow 49 and 69 is correctly aimed at. Groove 43 and 53 diameter are about 3/8 inch.The diameter in the main chamber 45 of passage 44 is about 1/4 inch, and the diameter of discharge unit 48 and 67 is about 0.125 inch and 0.094 inch respectively.It is thin that platform part 47 and 66 wall are approximately contended gradual changes with 35 degree.

When cleaning and barrier jet flow 49 and 69 when outwards having scanned radially outermost portion near the peripheral end of path 21, spray gun arm 26 goes back to towards central passage 22 as early as possible.Spray gun 25 is transformed into next path 21 thereafter.When dislocation, nozzle 40 and 50 current that penetrate preferably are blocked.Can be by cutting off current along spray gun 25, rotate spray gun arm 26 and make nozzle 40 and 50 directly or directly down up, use blocking element blocking-up current.Or achieve the above object by other proper methods.The purpose of blocking-up is to prevent to clean with barrier jet flow 49 and 69 directly to be mapped on all pipes 17 in first row 18, and this may damage them, and guarantees the cleaning of next path 21 is just begun after barrier jet flow 69 is started working.

When spray gun 25 has advanced to barrier nozzle 50 when being positioned at the position at tube sheet 12 centers, if spray gun arm 26 long enoughs are then proceeded above-mentioned cleaning, until the opposite side that reaches tube sheet 12.In other words, spray gun 25 can move on to relative inspecting hole 15 places, and by making spray gun arm 26 enter the periphery that is positioned at inspecting hole 15 from the central row of tube sheet 12.Continue to adopt this method to clean.Should be appreciated that at this suction lift 23 and relevant periphery stream viewing head will be access in the end opposite of central passage 22, nozzle system 30 will recast arrangement on spray gun arm 26, makes barrier nozzle 50 follow spray tip 40.For this reason, can provide two cover nozzle systems 30.Two complete spray guns 25 also can be provided, and getting final product like this needn't mobile spray gun 25.

When a half that has cleaned tube sheet 12, nozzle system 30 points to second half of tube sheet 12, repeats above-mentioned cleaning method.In other words, can provide spray tip 40 and 5050, simultaneously the both sides of cleaning and barrier jet flow 49 and 69 directive central passages 22 with dual drain.So that clean the two halves of tube sheet 12 simultaneously.People also recognize, as required, also can provide several spray tips 40, clean adjacent path 21 simultaneously.

Most preferred embodiment of the present invention utilizes the spray gun arm 26 of a rotation, and this spray gun arm is used in the steam generator that inspecting hole 14 and 15 is arranged in 10 inches of tube sheet 12 tops at least, and people will recognize that method of the present invention also can be applicable to other steam generator.Yet, when inspecting hole hole 14 and 15 was positioned at tube sheet 12 tops less than 10 inches position, spray gun arm 26 should not rotate, and should be cleaning and barrier jet flow 49 and 69 be arranged to such an extent that have very little angle with respect to tube sheet 12, and the increase jet speed, so that necessary cleanup action to be provided.

An important content of the present invention is that the present invention can use with " square type " or " triangular form " pitch tubes array, and only needs existing lance driving device is done very little modification.People also will anticipate and arrive, if need; Can make the several times cleaning operation to the same area of tube sheet 12, to guarantee to remove to greatest extent sludge.These people are found, adopt the present invention, each cleaning operation can be removed the remaining sludge more than 95%.

In sum, as can be seen, a kind of apparatus and method that are improved of cleaning remaining sludge on the nuclear boiler jar tube sheet have been provided, it is characterized in that: prevent that the sludge particle that is purged from scattering to the zone that tube sheet had been cleaned backward, thereby the efficient that makes native system remove sludge is greatly improved.

Claims (20)

1, in nuclear boiler with a tube sheet, method from the tube sheet supernatant deslime of nuclear boiler jar precipitation, a branch of parallel heat transfer tubes is housed in the generator jar, this this heat-exchange tube is arranged in parallel row that is separated by interchannel and the parallel columns of being opened by channel spacing, above-mentioned tube bank has a periphery, and said method comprises the steps; Make liquid clean first path of jet flow directive, with remove this path in the sludge precipitation, and the above-mentioned precipitation that is eliminated is shifted to the periphery of tube bank; Make second liquid jet, second path of barrier jet flow directive as liquid, alternate path and above-mentioned first path have the interval of two pipe row at least, move through above-mentioned barrier jet flow with the sludge precipitation that prevents to be eliminated, and enter the previous path that cleaned; And remove the cleaning liquid that is loaded with sludge from the periphery of above-mentioned tube bank.

2, the process of claim 1 wherein that the interval of the described alternate path and above-mentioned first path is between 2 to 20 pipe row.

3, the process of claim 1 wherein that 3 pipes of described alternate path and above-mentioned first channel spacing are listed as.

4, the method for claim 1 further comprises around one being parallel to tube sheet and rotating the step of above-mentioned jet flow perpendicular to the axle of above-mentioned path, is mapped to the distance of tube sheet to change jet flow from this.

5, the method for claim 4, wherein when above-mentioned jet flow when described axle is shifted to the tube bank periphery, this jet flow is to rotate than low rate; And when above-mentioned jet flow from restraining periphery when described axle is retracted, this jet flow is rotated with higher rate.

6, the method for claim 1 comprises that further order makes jet flow along the advance step of a path of all paths at every turn.

7, the method for claim 6, wherein above-mentioned cleaning jet flow is blocked the motion process that moves on to next path from a path.

8, as the method in claim 1, this method comprises the steps: aforesaid liquid to be cleaned the emission point that pre-determines distance from one above tube sheet jet flow guide first path into, to remove the sludge precipitation; Above-mentioned barrier jet flow comprises that relative tube sheet plane separately successively with a large amount of jets of smaller angle orientation, so that penetrate on tube sheet with the distance that increases successively from emission point, provides long barrier along above-mentioned alternate path.

9, the method for claim 8, wherein said barrier jet flow comprises 3 liquid jets.

10, the method for claim 9.In one of the centre of wherein above-mentioned 3 jets and other two jets any one all is 20 degree angles basically and lays.

11, the method for claim 8 further comprises the step that is mounted to the axle rotation above-mentioned cleaning jet flow parallel and vertical with above-mentioned path with tube sheet around, to change the distance of above-mentioned cleaning jet flow from this directive tube sheet.

12, the method for claim 11, wherein above-mentioned barrier jet flow is rotated around above-mentioned axle simultaneously with above-mentioned cleaning jet flow.

13, the method for claim 8 further comprises making above-mentioned jet flow move the step of a path along described all paths successively at every turn, and block above-mentioned cleaning jet flow the motion process that moves to next path from a path.

14, be used to remove device from sludge precipitation on the nuclear boiler jar tube sheet, in nuclear steaming steam generator jar, a branch of parallel heat exchanger is housed, these heat-exchange tubes are arranged in parallel row that is separated by interchannel and the parallel columns of being opened by channel spacing, said apparatus comprises a spray gun that can insert along passage, and has one first nozzle, be used for liquid is cleaned first path of jet flow directive, to remove sludge precipitation wherein, and that these precipitations are shifted to the periphery of tube sheet and be positioned at the tube sheet peripheral position is used to collect and drain the equipment that is loaded with sludge liquid, the feature of said apparatus is, second nozzle is housed on spray gun, its position can make nozzle with second path of liquid barrier jet flow directive, at least manage row in two at interval with path and above-mentioned first path, move through the above-mentioned jet flow that stops with the sludge that prevents to be eliminated and enter the previous path that cleaned.

15, the device of claim 14, second wherein above-mentioned nozzle is fixedly mounted on the spray gun.

16, the device of claim 14 is wherein located second above-mentioned nozzle, makes 3 pipe row of above-mentioned alternate path and above-mentioned first channel spacing.

17, the device of claim 14, second wherein above-mentioned nozzle comprise and are arranged in angled discharge orifice in a large number each other, and a large amount of hydrofluidic of each self-emission of these holes is united and formed above-mentioned barrier jet flow.

18, the device of claim 17, second wherein above-mentioned nozzle comprises 3 discharge orifices.

19, the device of claim 14 further comprises the parts of vessels of a hollow, and above-mentioned first and second nozzle all fixedly mount thereon and interrelate therewith.

20, the device of claim 19, the above-mentioned parts of vessels that wherein is installed on the spray gun can dismounting.

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