RU2124163C1 - Smock stack - Google Patents

Abstract

FIELD: heat-power engineering. SUBSTANCE: present-day smoke stacks fail to ensure required draft; proposed smoke stack is provided with delivery air duct whose nozzle is directed in way of escape of flue gases. After nozzle, shaft of smoke stack may be made in form of confuser which may terminate in mixing chamber or in diffuser. Mixing chamber may be also positioned between confuser and diffuser. EFFECT: creation of rarefaction sufficient for removal of flue gases through smoke passages having considerable aerodynamic resistance. 4 cl, 5 dwg

Description

 The invention relates to the field of heat engineering and can be used, in particular, to increase the draft of chimneys.

 Known chimneys containing a smoke channel with a straight generatrix (1).

 Their disadvantage is low traction characteristics, insufficient to overcome the aerodynamic drag of smoke channels.

 A device for removing smoke, containing a chimney and installed in it with a gap, an ejector with a mixing chamber (2). The disadvantage of this device is the need for strict alignment of the ejector along the axis of the chimney.

 Known chimney containing a barrel and nozzles for supplying gas, and the lower part of the barrel is equipped with a displacement chamber with nozzles, and the barrel is made in the form of a confuser, a cylindrical insert and a confuser (3).

 The disadvantage of such a chimney is the placement of the mixing chamber at the entrance to the first confuser, which does not provide a vacuum sufficient to lift the exhaust gases.

 The closest invention to the described is a chimney jet apparatus containing a barrel with a pressure duct introduced into it from the outside, directed towards the exit of flue gases (4). The disadvantage of this pipe is the clutter of the annular gap for the passage of flue gases placed in it by the rotary nozzles of the supply of the working fluid.

 In order to eliminate this drawback in a chimney containing a barrel with an injection duct introduced into it from the outside, directed towards the exit of the flue gases, the pipe trunk behind the nozzle has the shape of a confuser.

 This achieves the required technical result - an increase in the traction characteristics of the chimney due to the ejection of flue gases using a stream of air coming from the nozzle of the discharge duct.

 In addition, the achievement of this technical result in embodiments is ensured by the fact that the pipe trunk behind the confuser has the shape of a diffuser; the pipe trunk behind the confuser has a gas mixing chamber; the confuser and diffuser are combined by a gas mixing chamber.

 The invention is illustrated by drawings, where in FIG. 1-5 depict embodiments of the chimney.

 Information confirming the possibility of carrying out the invention to obtain the above technical result are as follows.

 The chimney (figure 1) contains the barrel 1, the discharge duct 2.

 The chimney (figure 2) contains a barrel 1, a discharge duct 2, a confuser 3.

 The chimney (figure 3) contains a barrel 1, a discharge duct 2, a confuser 3 and a diffuser 4.

 The chimney (figure 4) contains a barrel 1, a discharge duct 2, a confuser 3, and a gas mixing chamber 4.

 The chimney (Fig. 5) contains a barrel 1, a discharge duct 2, a confuser 3, a diffuser 4 and a gas mixing chamber 5 that combines a confuser 3 and a diffuser 4.

 The principle of operation of the proposed chimney is as follows. Into the smoke stream passing through the barrel 1 of the pipe (Fig. 1), air is supplied under pressure through the discharge duct 2, for example, from a fan (not shown in Fig.) And entrains flue gases due to the rarefaction created by the air flow from the nozzle of the discharge duct .

 In the pipe (Fig. 2), air is injected under pressure into the flue stream passing through the pipe trunk 1 through the discharge duct 2, which, passing through the confuser 3, creates even greater depression for the intake of flue gases by increasing the speed of the gas-air mixture.

 In the pipe (Fig. 3), air is injected under pressure through the discharge duct 2 through the discharge duct 2 through the air duct 2, which, passing through the confuser 3, creates even greater vacuum for the intake of flue gases by increasing the speed of the gas-air mixture. The diffuser 4 allows you to reduce aerodynamic drag by reducing the speed of the mixture.

 In the pipe (Fig. 4), air is injected under pressure into the flue stream passing through the pipe trunk 1 through the discharge duct 2, which, passing through the confuser 3, creates even greater vacuum for suction of the flue gases by increasing the speed of the gas-air mixture. The mixing chamber 4 serves to reduce aerodynamic resistance to the flow of the mixture by equalizing the speeds of the constituent gas and air mixture.

 In the pipe (Fig. 5), air is injected under pressure into the flue stream passing through the pipe trunk 1 through the discharge duct 2, which, passing through the confuser 3, creates even greater depression for the intake of flue gases by increasing the speed of the gas-air mixture. The mixing chamber 5 serves to reduce aerodynamic resistance to the flow of the mixture by equalizing the velocities of the gas and air components of the mixture. The diffuser 4 allows you to reduce aerodynamic drag by reducing the speed of the mixture.

 The proposed technical solution was tested as part of the heat generator model VZGA. Tests have shown that the proposed device creates a vacuum sufficient to remove flue gases through flue channels having high aerodynamic drag.

 According to the results of experimental studies, the proposed technical solution was used in the documentation of heat generators of the VZGA series.

Claims (4)

 1. A chimney containing a barrel with an injection duct introduced into it from the outside, directed towards the exit of the flue gases, characterized in that the pipe trunk behind the nozzle has the shape of a confuser.  2. The pipe according to claim 1, characterized in that the pipe barrel behind the confuser has the shape of a diffuser.  3. The pipe according to claim 1, characterized in that the barrel of the pipe behind the confuser has a gas mixing chamber.  4. The pipe according to claims 1 to 3, characterized in that the confuser and diffuser are combined by a gas mixing chamber.

Images