The method of spraying liquid and a device for its implementation

 

(57) Abstract:

The spraying liquid is pairwise colliding counter-directed fluid flows in the form of twisted in opposite directions thin conical film so that after colliding with an adjacent pair of threads, each of them is faced with other threads repeatedly with the formation of a fine cloud of spray. For implementing the method of spraying liquid, an apparatus containing at least two sequentially arranged on the same axis, a pair of coaxially mounted centrifugal atomizers, facing the outlets towards each other. Form of fine clouds regulated by automatic control of the amount of fluid and pressure. The invention provides spray variable volume fluid with the formation of a homogeneous fine volume spray and regulation of the quantity of sprayed liquid in a wide range. 2 S. and 4 C.p. f-crystals, 7 Il.

The technical field

The invention relates to techniques for spraying liquids, in particular to an improved technique for the distribution of fluid flow haschimi characteristics, used in chemical, food, energy and other industries.

Prior art

Many technological processes in various industries at one of the stages require contact of liquid and gas. Such contact is carried out, in particular, by distributing the liquid in the gas stream. It is obvious that the process of interaction between the gas and liquid will be most effective when the area of contact will be the greatest. Therefore, one of the best methods of conducting such a process can be considered a distribution in the gas flow of a liquid in a fine spray. Wide application in industry has been a method of spraying a liquid at which its different jet configurations intersect with the formation of a cloud of fine spray.

Known technical solution (Application Germany N OS 3440901), according to which the main fluid flow is divided into several and with the help of swirlers release them in the form of cones at an angle to each other, providing their intersection in the area of the side surfaces. Thus the splitting of water jets to one another with formation in the Noah device, containing certain specified number of organized way of swirlers. The design features limit its scope and make unfit for distribution, for example, contaminated liquids or liquids with mechanical impurities. In addition, fixed swirler, the number of which cannot be increased or decreased, suggest the formation of clouds of a certain size, which cannot be increased or decreased. Meanwhile in the industry, as a rule, there is a periodic variation of the physico-chemical characteristics of the gas flow, for example, its speed, dust or acidity. In this case, compliance technology contact of liquid and gas in General, it is necessary to regulate the quantity of sprayed liquid without changing the qualitative characteristics of the resulting cloud of spray. The application of this known technical solution makes such regulation is impossible.

It is also known technical solution (U.S. Patent N 5180103), according to which the fluid flow is divided into several clear them in the form of thin liquid films, organized in space in such a way that each separate drops of approximately equal size and uniform distribution in a given space. However, this solution involves the formation of an initial flat stable low-energy liquid films, which when repeated directions break up into individual droplets, but not sprayed with the formation of a fine cloud of spray.

In addition, this solution involves the use of complex structures with nozzles of a special form, not intended to regulate the quantity dispensed fluid, expensive and difficult to operate.

It is also known technical solution (Patent RF N 2050203), according to which the fluid flow is divided into two and pit them against each other, sending a counter in the form of twisted in opposite directions thin conical film. Revolving with a large radial component of velocity, designed counter flow of liquid in the collision have a wide angle shot, which leads to the formation of a cloud of fine spray.

This method of spraying liquid carried out using a device which consists of two coaxially mounted camera with the bottoms facing each other output areas, the supply of fluid to which of marouda involving cone nozzles, which decorated the weekend lots of cameras. The friction of the liquid on the nozzle reduces the radial component of the velocity of the resulting liquid films and eventually reduces the dispersion of the spray. In addition, the supply of fluid to the second chamber is provided via passing through the first nozzle chamber, the nozzle, which causes the necessity of increasing the size of nozzle chambers, reduces the potential of creating high output speeds at low pressure fluid and, thus, reduces the scope of application of the device. It should also be noted that this solution not only involves the regulation of the quantity of sprayed liquid, but does not provide for the preservation of the quality characteristics of the resulting cloud of spray when the inevitable technological fluctuations of fluid pressure entering the chamber. Fluctuations in fluid pressure cause changes in the output speed of the fluid, and since the area of the colliding of two cone-shaped liquid films stabilized cone nozzles for complete atomization of liquid only under certain parameters of the fluid flow, the changes lead to slippage or sliding of the individual liquid streams, which are not affected by raspisannogo, the present invention is to solve the problem of implementation spray variable volume fed to the dispersion liquid with the formation of uniform fine cloud of spray and create intended for this device, a constructive solution which would allow to adjust the amount of sprayed liquid in a wide range.

The invention

To solve this task according to the present invention proposes a method of spraying liquid, in accordance with which you want to spray the fluid flow is divided into pairs the number of separate threads so that there were at least four. These threads are pairwise sum to one another counter in the form of twisted in opposite directions thin cone-shaped liquid films are formed at least two pairs of adjacent oppositely directed threads, which have successively on the same axis. Designed by flow face, and at least two of them after colliding with a connecting thread again face each other. As a result of this interaction, separate streams of liquid, a fine cloud of spray liquid.

Further according to the present invention in the case of spray liquid in the interaction of at least three pairs of adjacent oppositely directed flows of at least two of them face with other threads many times. This pattern of interaction between individual streams provides the ability to get the shape of the clouds of spray in accordance with the technological needs.

To solve this task according to the present invention features a device for implementing this method of spraying liquid, representing at least two pairs of coaxially mounted centrifugal atomizers, which are recorded sequentially on the same axis. The nozzles are connected tangentially with the pipes for the supply of the liquid, and their output sections in each pair facing toward each other and are short nozzle. The distance between the nozzles depends on the output speed of each of the oppositely directed flows on to the features of the process is determined by the following formula:

< / BR>
where W is the output speed of the liquid from the nozzle, m/s, D is the diameter of the chamber atomizer, m, d is the equivalent diameter of the inlet pipe.

Further according to the present invention provided that the device rotary atomizers are performed with two oppositely directed nozzles and two Autonomous inlet nozzles. This design centrifugal distributors in some cases, you can simplify the whole device.

In addition, according to the present invention serves to provide a device unit for automatic adjustment of the fluid in each of the centrifugal atomizers, and in each of the sequentially disposed on the same axis, a pair of such centrifugal atomizers. This automatic block allows you to change the shape and size of the clouds of spray fluid without changing the qualitative characteristics of the spray.

Brief description of drawings

In Fig. 1 shows a diagram of the spray liquid according to the invention.

In Fig. 2 presents a diagram of the interaction of individual streams of atomized liquid according to the invention.

In Fig. 3 presents a diagram of a device for spraying liquid which I fluid according to the invention.

In Fig. 5 presents a plot of the distance between the nozzles of the paired centrifugal atomizers in a separate element of the device according to the invention.

In Fig. 6 presents a diagram of the device according to the invention, in which used centrifugal sprayers with two oppositely directed nozzles and two Autonomous inlet pipes.

In Fig. 7 presents a diagram of the device according to the invention, equipped with a block of automatic control.

Description of the preferred use of the invention

As shown in Fig. 1, a method of atomizing liquids according to the invention is in the separation of the main flow of the liquid 1 on four separate streams and their pairwise summation in consistently placed on the same axis paired devices 2' and 2", which convert them into twisted in opposite directions thin conical film 3', 3", 3"' 3"", send them opposite to each other and face, causing atomization of the liquid. At this extreme of the sequentially disposed on the same axis so executed threads 3' and 3", after colliding with the adjacent threads 3" and 3' respectively face between saylani when colliding with adjacent threads 3" and 3', respectively.

Threads 3" and 3"' after colliding with adjacent, the extreme of sequentially disposed on the same axis threads 3' and 3", unlike the latter, cannot collide again in other threads. To avoid incomplete atomization of the liquid from these streams, the output speed is reduced and the amount supplied to the spray through these fluid flows reduced accordingly.

In the zone of interaction between organized according to this scheme the flow of liquid, a fine cloud of spray high degree of homogeneity, a limited area A. the Difference in size of the droplets is not more than 20%.

As shown in Fig. 2, in the case of the interaction of more than two pairs of adjacent oppositely directed flows of part 3 of them at a corresponding adjustment of their output speeds and volumes supplied to the spray through these streams of liquid to collide with other threads many times. In this case, the cloud of sprayed liquid, a limited area A, may extend to a considerable distance from the paired device 2, the organizing separate threads 3 of the liquid in accordance with proposed according to the invention scheme. Correction of the output flow rates of 3 and and and limit the area B. The size of the area B are set in places secondary intersection b 3 threads. Changes in quality characteristics of the resulting cloud of spray is not happening.

As shown in Fig. 3, the device proposed according to the invention the method consists of arranged sequentially on the same axis of pairs of coaxially mounted centrifugal sprayers 2, output areas which are short of the nozzle 4 and facing towards each other. Rotary atomizers 2 tangentially connected with the inlet pipe 5, which are connected to the General system of fluid supply 6.

The device operates as follows. The fluid supply system fluid 6 through the supply pipe 5 enters the centrifugal nozzles 2, which guide them in pairs counter after a short nozzle 4, which converts the liquid flows in a swirling in opposite directions thin conical film of liquid. The obtained liquid film while throwing a given number of times in accordance with the technological task, receiving a cloud of fine spray. Short nozzle 4 centrifugal sprayers 2 allow you to change the angle of the conical liquid films is abania fluid pressure in the supply system of the liquid 6 does not affect the process of spray liquid according to the present invention.

The distance between the nozzles in each pair of nozzles determines the place of confrontation of two adjacent oppositely directed flows, which are converted in centrifugal sprayers in twisted in opposite directions thin conical film of liquid. This place is colliding directly impact on the quality of the resulting cloud of spray and was determined experimentally. In the practical research was the dependence of the distance between the nozzles from the output velocity of the fluid, the diameter of the chamber atomizer and equivalent diameter of the inlet pipe.

As shown in Fig. 4, H is the distance between the nozzles centrifugal sprayers 2, D is the diameter of the chamber atomizer 2, d is the equivalent diameter of the inlet pipe 5 of the nozzle 2.

As shown in Fig. 5, the H value is a function of the ratio Wd/S, where W is the output speed of the fluid, D is the diameter of the chamber atomizer, a d - equivalent diameter of the inlet nozzle of the sprayer

< / BR>
Example calculate the magnitude H

In the industrial cooling tower pressure in the water system have an average of 0.7 ATM. When connecting to this device, centrobejnuu dispenser. In such conditions, the output speed of the liquid W is 4.6 m/s If the device uses centrifugal spray chamber diameter D = 195 mm equivalent diameter of the inlet pipe d = 50.5 mm, the ratio Wd/D respectively will be 1.2. In this case, as shown in Fig. 5, the value of H is equal to 230 mm Therefore, in this device, the centrifugal nozzles of each pair must be installed with the distance between the nozzles 230 mm

As shown in Fig. 6, in the device proposed according to the invention method are centrifugal sprayers 2' with two oppositely directed nozzles 4 and two Autonomous inlet pipe 5. One such dispenser 2' replaces two conventional centrifugal atomizer with one inlet pipe installed by the end faces to each other. These design features allow in some cases to expand the range of industrial applicability of the device and to facilitate construction in General.

As shown in Fig. 7, coaxially mounted a pair of centrifugal distributors 2, of which according to the invention is a device attached to the system fluid supply V. Magdacesti, allowing the change of process conditions to change the quantity supplied to the atomization of a liquid by enabling or disabling the part of the paired centrifugal sprayers and do not change this qualitative characteristics of the clouds of spray. Each of the paired centrifugal atomizers offline also connected to the power P of the automatic regulation of the pressure fluid. This unit P allows you to adjust the output speed of each of the fluid flows involved in spraying. Work unit Q and the block P is coordinated common block QP automatic regulation of the spraying liquid, which is designed to control the shape and size of the cloud of spray in accordance with changing process conditions.

Proposed according to the invention, the device may be used as separate modules, options for combining them in a specific apparatus is practically unlimited and allow you to organize the process of spraying a liquid in a wide range of process conditions.

Industrial applicability

The technical solution according to the invention can be used in chemical, food, energy the metabolic processes, such as heating or cooling fluid, condensation of low-grade vapor, wet purification of gases from chemical and mechanical impurities.

1. Method of atomization fluid, including its division into separate threads, a pair summing to one another counter in the form of twisted in opposite directions thin conical film and subsequent directions, characterized in that the spray liquid is carried out at the interaction of at least four streams of liquid forming at least two located on one axis of a pair of adjacent oppositely directed flows of at least two of which, after colliding with a connecting thread again faced each other.

2. The method according to p. 1, characterized in that the output flow rate adjacent to the extreme of sequentially disposed on the same axis in pairs oppositely directed flows of fluid is lower than the output speed of the adjacent liquid streams.

3. The method according to p. 1 or 2, characterized in that the spray liquid is carried out at the interaction of at least three pairs of adjacent oppositely directed flows of at least two of which are repeatedly confronted with other stream is spiritali, converted output sections towards each other and tangentially connected to the inlet pipe, characterized in that it comprises at least two sequentially arranged on the same axis, a pair of centrifugal atomizers, output areas which are short of the nozzle, and the distance between nozzles is determined by the following formula

< / BR>
where W is the output velocity of liquid, m/s;

d is the diameter of the nozzle of the sprayer, m;

D is the diameter of the chamber atomizer, m

5. The device according to p. 4, characterized in that the rotary atomizers are made with two oppositely directed nozzles and two Autonomous inlet pipes.

6. The device according to p. 4, characterized in that it has the power to automatically regulate the flow of fluid in each of the centrifugal nozzles in each of the sequentially disposed on the same axis, a pair of centrifugal atomizers.

 

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FIELD: oil and gas industry.

SUBSTANCE: in end piece, flow conic slit-like channel of variable section is made screwed with rotation of longitudinal axis for angle 20-60. Section at output is decreased in comparison to input in 1.5-3 times.

EFFECT: higher efficiency.

3 dwg

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