SU1763807A1 - Mixer of burner device - Google Patents

Abstract

Use: in burner devices. Essence: the axis of the holes 3 are located at variable angles to the longitudinal axis of the gas under the water pipe 2, increasing along the movement of the interacting media, the maximum value of which should not exceed 135 ° C and the wall thickness of the gas supply pipe 2 is greater than or equal to 1.4 the diameter of the holes 3. 1 Il.

Description

h |

About Sd) 00

Oh h

The invention relates to a firing heat technology, namely, to mixers of burners for various purposes.

A gas mixer is known that contains an air supply housing with an axially installed gas pipe with annular transverse rows of identical nozzle openings (see, for example, Arseev LV. Combustion of natural gas. M Metallurgizdat, 1963, p. 186, rice .8-14).

The disadvantages of this device are insufficiently effective mixing due to uneven distribution of gas through the holes. The closest to the claimed technical solution is a gas mixer containing an air inlet housing with an axially mounted gas pipe with annular transverse rows of radial uniform nozzle openings. Inside the pipe between the rows of nozzle openings, throttle washers are installed, and the end of the distributor is plugged (see AS No. 916895.1982).

The disadvantages of this device are low mixing efficiency with structural and technological deviations, with variable operating modes.

The purpose of the technical solution is to improve the quality of the preparation of the mixture.

This goal is achieved by the fact that in a plate device mixer comprising an air inlet housing with a gas supply pipe installed on the axis with annular transverse rows of holes of the same diameter, according to the invention, the axes of the openings of different rows are at different angles to the axis of the gas supply pipe, the angles along the motion of the interacting media are monotonous, the maximum angle should not exceed 135 °, and the pipe wall thickness should be at least 1.4 of the diameter of the holes.

8 of the prototype and the proposed technical solution, the gas is introduced by a system of transverse jets from a pipe through several rows of holes. The characteristics of mass transfer during the lateral flow of jets, as is known, depend to a decisive extent on the depth of penetration of the transverse jets, i.e. on the distribution of gas jets over the cross section of air flow. Since h G, then from row to row the depth of penetration of transverse jets monotonously decreases, since in the course of fluid movement the relative flow rate

Gir

decreases. Here G

i

-, G2 GKr + GB

to 1

mass flow. Indices; in - air, d - gas, I - number r yes. In the prototype, the decrease in h is also realized due to the installation of throttle washers (

static pressure drop along the gas flow). As a consequence, in the prototype, the efficiency of mass transfer is low. This is all the more true with an increase in the number of rows of holes. In the proposed device, this disadvantage is eliminated by supplying gas at different angles to the axis of the gas supplying pipe. Since when the angle of attack decreases and the depth of introduction of the jets in the radial

the direction is also reduced, then by changing the angle of attack (increasing it in the course of the movement of the media), the effect of the variation of G on the distribution pattern of the jets over the flow cross section is compensated. Thereby

it is possible to maintain Popt for all rows of jets, and hence the maximum quality of the preparation of the mixture.

Distinctive features of the proposed technical solution

the criterion of significant differences as shown by the analysis of scientific, technical and patent literature.

The drawing shows a General view of the proposed device.

The burner mixer contains an air supply housing 1, along the axis of which a gas supply pipe 2 is installed. On the side surface of the gas supply pipe 2 there are several

annular rows of holes 3. The axes of the holes 2 are located at different angles to the axis of the air inlet housing. As the interacting media moves, the angle between the axis of the holes 3 and the axis of the pipe 2

monotonously increases. As a consequence, the minimum value of the angle a has for the 1st row of holes 3. And the maximum value is for the last row of holes 3. At the same time, the maximum value of the angle a should not

exceed 135 °, and the ratio of the wall thickness of the pipe 2 to the diameter of the holes 3 must not be less than 1.4.

The operation of the device is as follows.

Air in the form of a stream enters the air inlet housing 1. Gas enters through the gas supply pipe 2, and from it through the system of openings 3 flows into the air stream in the form of a multidirectional system of transverse jets.

By increasing the outflow angle of each successive series, an optimal redistribution of the fuel over the air flow and an efficient mass exchange of the interacting media are provided.

Comparative tests of the models of the prototype and the proposed technical solution were carried out in a wide range of parameters of mixers: n 4- 64, m 1-6, d 0.01-0.10, and 30-150 °.

, 02-3.0, d - r1,6 - g-, p - the number of UKO

holes, m is the number of rows of holes, and is the angle of attack of the jets, b is the wall thickness of the gas supplying pipe. Indices: from - hole, to - body.

It has been established that pr 135 ° decreasing the angle of attack of the jets determines the decrease in the depth of their penetration. When a is 135 ° opposite an increase in the angle of attack leads to a decrease in h, as a consequence of exceeding more than 135 ° it is not advisable.

At 5 5, the true angle of outflow of the jets is not equal to the geometrical one (the axis of the hole does not match & &). Moreover, this deviation is the more significant the smaller the wall thickness of the gas supply pipe. As a result, at such thicknesses, the design and operation of devices is significantly complicated. In addition, in this case, when the wall thickness changes, the hole flow rate changes (l, which leads to a change in the flow rate of the individual rows of holes. At 5 (5 these negative effects affect the wall thickness on

jet propagation characteristics are absent. As set, 40dOT.

Thus, the proposed technical solution a can significantly improve the quality of the preparation of the mixture. The effectiveness of using the device increases with an increase in the number of rows of holes. So, for example, when

,, 02 the optimal law of change of angles of attack is as follows: oi 75 °, o & 85 °, oa 94 °, sig 100 °. At the same time, the maximum quality of preparation of the mixture is practically ensured, while for the prototype the value is 0 0.81. Here is the quality parameter of blending.

Claims (1)

An inventive burner mixer comprising an air supply housing with an axially installed gas supply pipe with annular transverse rows of holes of the same diameter, characterized in that, in order to improve the quality of gas mixing with air, the axes indicated the openings are located at variable angles to the longitudinal axis of the gas supplying pipe, increasing in the direction of the interacting media, the maximum value of which should not exceed 135 °, and the wall thickness of the gas supply pipe is greater than or equal to 1.4 of the diameter of the holes.