SU1695045A1 - Method of burning powdered fuel - Google Patents

Abstract

The invention relates to the power industry, in particular, to the area of combustion of solid fuels, and can be used in thermal power plants. The purpose of the invention is to increase the stability of combustion in the mode of stopping the supply of the air mixture to one of the burners. The method of burning the pulverized fuel of 6 steam streams is that the air-mixture and air, which is controlled, are supplied to the pair-mounted burners. In the event that the air mixture is stopped in one of the burners in this burner, the air supply is increased while maintaining the ratio of the number of movements of flows from the burners equal to the corresponding ratio of the number of movements of these flows in the mode of delivery of the mixture to both burners. When increasing the air supply and the specified burner at the same time reduce the air supply to the other burner. 1 il.

Description

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The invention relates to the combustion of solid fuels and can be used in thermal power plants.

There is a known method of burning pulverized fuel in paunit jets, which imply that a pair of burners is supplied with a mixture of air and air, the flow rate of which is controlled, and if the supply of the mixture to one of the burners to the specified burner is increased, the ratio of the amount of movement resulting from torches of streams equal to the corresponding ratio of the amount of movement of these streams in the mode of feeding the mixture to both burners.

The disadvantage of this method of combustion is that despite maintaining aerodynamic stability in all modes, torch stability. Burning stability

The fuel in the mode of stopping the supply of the air mixture to one of the burners can be significantly reduced due to a drop in the temperature of the surrounding gaseous medium near the burner, into which the air mixture enters.

The aim of the invention is to increase the stability of combustion in the mode of stopping the supply of the air mixture to one of the burners.

In the method of burning the pulverized fuel, which consists in the pairwise located burners supplying the air mixture and air, the flow rate of which is controlled, and in the event that the flow of the air mixture is stopped into one of the burners, the air flow is maintained at the specified burner, maintaining the flow ratio of the flows flowing from the burners, equal to the corresponding ratio of the amount of movement of these flows in the mode of feeding the mixture to both burners, the goal is achieved

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by increasing the air supply to the burner, to which the supply of the air mixture is stopped, at the same time, reduce the air supply to the other burner.

The drawing schematically depicts a firebox in which the proposed method of burning pulverized fuel is realized,

The firebox contains a pair of burners 2 arranged on a vertical wall 1, inclined towards one another in a vertical plane. The angle of inclination of the upper and lower burners 2 with respect to the horizontal is the same. Each burner 2 has an air mixture feed channel 3 and an air supply canap 4. Channels 3 feed mixtures of the upper and lower burners 2 are connected to different dust systems.

The method of burning pulverized fuel is carried out as follows.

During the operation of two dust systems, in the upper and lower burners 2, through the channels 3, an aero-mixture (coal dust and a drying agent) is supplied in equal amounts, through the channels 4 - air. The ratio of the amount of motion (K) flowing from the upper and lower burners 2 streams (a mixture and edger) is set in accordance with the required (according to the conditions of combustion technology) flame position in the furnace. At K 1.0, the torch occupies a horizontal position in the furnace, at K 1.0, the torch is deflected up from the horizontal, at K 1.0 - down from the horizontal.

When removing one of the dust systems to the reserve or repairing the supply of the aerosol through the associated with it dripped 3 one of the burners

2, for example, the upper one is terminated. In that

. case of air supply to the upper channel 4

burners 2 increase, and the channel 4 lower

mount / her 2 is reduced by maintaining the ratio of the amount of motion K of the 2 flows flowing out of the upper and lower burners the same as in the feed mode of the mixture into both burners 2. This intensifies the ignition of the flow of the mixture given through the lower burner 2, and consequently, the stability of the burner is improved and, in addition, at the same time, aerodynamic stabilization of the torch is ensured, which does not change its position in the furnace.

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Claims (1)

Claims The method of burning a pulverized fuel in a pair of streams is that a pair of burners are supplied with a mixture of air and air, the flow rate of which is controlled, and in the event of a failure of the feed of the aerosymbe to one of the burners, the specified burner increases the flow of air while maintaining the ratio of motion flows from the burners. equal to the corresponding ratio of the amount of movement of these flows in the mode of supplying azrosmea to both burners, and in order to increase the stability of burning in the mode of stopping supplying the mixture to one of the burners, while increasing the supply of air to the specified burner, simultaneously reduce the supply air into another burner.