SU964342A1 - Pulverised coal burner - Google Patents

Description

one

The invention relates to burner installations for burning coal coal fuels, preferably in rotary kilns and can be used in the building materials industry.

Burners for rotary kilns are known, containing coaxially arranged tubes forming concentric channels for feeding pulverized fuel and air fl.

However, the known burners do not allow a quick change in the geometric and thermal parameters of the torch.

Closest to the proposed is a pulverized burner containing coaxially arranged, with the formation of an annular channel of the pipe, the peripheral and middle of which are connected to the air source, and the central one is installed with the possibility of rotation around its axis,

communicated by the rear section with the nozzle for supplying the air mixture and is made at one of its ends with an oblique cut, and the channel between the peripheral and middle pipes is plugged from the rear end 2.

The disadvantage of this burner is the narrow control range due to the fixed installation of pipes.

The purpose of the invention is to expand the range of control of the burner.

This goal is achieved by the fact that in the burner in the front part of the peripheral pipe there are windows for suction of atmospheric air, and the central pipe has an oblique cut at the rear end.

Claims (2)

In addition, the peripheral pipe can be installed with the possibility of longitudinal movement relative to the middle pipe, provided with protrusions on the front section, re-3E (covering when the peripheral pipe moves its window. In Fig. 1 a burner is shown, longitudinal section; Fig. 2 is a section A - A in Fig. 1. A dust burner contains pipes 1-3 that are coaxial with the formation of an annular channel, peripheral 1 and middle 2 of which are connected to an air source, and central 3 are rotatably mounted around its axis The front section of the peripheral pipe 1 has openings 5 for suction of atmospheric air, and the middle pipe 2 is equipped with protrusions 6, which block when the peripheral pipe 1 of its opening 5 moves. The burner works as follows: A pulverized mixture from the bunker is fed by a high pressure fan into the middle pipe 2. If the oblique cut of the pipe 3 is in position I, the bulk of the dust falls into the pipe 3 under the elevations It is supplied with primary air and blown into the oven. At the same time almost all the dust will go through the central pipe 3, and the air will be distributed evenly over the entire cross section of the burner. If the oblique cut of pipe 3 is fixed at position II, the pulverized mixture will flow along the middle pipe 2, and part of the primary air passes through the central pipe 3 and at the outlet enters the center of the pulverized coal. Such a dust distribution over the cross section of the burner makes it possible to adjust the temperature of the flame and change its configuration. In the first case, the pulverized mixture supplied through the central pipe 3 is shielded by air with a small amount of coal dust coming out of the middle pipe 2. At the same time, the pulverized mixture passes much more time before heating to the burning temperature than when the whole dust-air mixtures of one concentration through one pipe. The fuel ignites at a considerable distance from the cut-off of the burner. At the second position of the oblique cut of the pipe 3, clean air is supplied to the root of the dust-air jet through it. This makes it possible to significantly intensify the burning process due to the fact that the central part of the flame in this case will have sufficient oxygen for burning. The pulverized coal stream is ignited both at the periphery and inside, which shortens the time before the flame ignites and reduces its length, while the flame temperature must be very high. The peripheral tube 1 of the burner, provided with windows S, into which hot air is drawn from the furnace volume, can slide along the middle tube 2, while the windows 5 are either closed by special projections 6, or are completely open. With windows 5 open, hot air enters the burner due to the vacuum created by the nozzle of the middle pipe 2. The hot air mixed with the dust-air flow in turn intensifies the combustion process by increasing the temperature of the dust-air mixture. The presence of two control units allows the flame parameters to be varied over a wide range with a smooth transition from one mode of operation of the proposed burner to another, which ensures a reduction in fuel consumption for firing by 2-3 .. Claim 1. The coal-burning burner containing coaxially arranged to form the annular channel of the pipe, the peripheral and middle of which are connected to the air source, and the central pipe is installed with the possibility of rotation around its axis, communicated by its rear section with the supply pipe air mixture and made at one of its ends with an oblique cut, and the channel between the peripheral and middle pipes is plugged from the rear end, characterized in that, in order to expand the range of adjustment, in the front section of the peripheral pipe there are openings for suction of atmospheric air, and the pipe has an oblique cut at the rear end. 2. The burner according to claim 1, of which is permissible so that the peripheral tube is installed with the possibility of longitudinal movement relative to „UoM 1 Khodorov E.I. Cement kilns about Ha; Ge; n :: ° g;: cr ::, .JeJc .: l., С.р “from„ а .., 68, moving the peripheral tube of its ox. ЗЬ / на. С 2 USSR author's certificate Sources of information, 5 p. F 23 D 17/00, 19b9. taken into account in the examination number. cl. f o .