SU1695043A1 - Method of fuel combustion - Google Patents

Abstract

The invention relates to energy and can be used in boiler installations with liquid slag removal. The invention allows to increase the efficiency of the boiler plant. In the boiler plant serves the drying agent and fuel. Grind fuel, prepare a mixture and served in pulverized coal burners. At the same time, highly reactive fuel is burned below the level of pulverized coal burners, and spent spent drying agent 1C, f-ly, 1 sludge is used as oxidizing agent for highly reactive fuel.

Description

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The invention relates to energy and can be used in boiler installations with liquid slag removal.

There is a known method of burning fuel in a boiler plant by drying and grinding solid fuel, preparing an air mixture, burning it in pulverized coal burners and removing slag from the furnace in a liquid state.

The disadvantage of the known method is the instability of the liquid slag output when burning low-grade fuels.

The closest to the technical essence and the achieved result to the proposed method is the combustion of fuel in the boiler plant by supplying a drying agent and solid fuel, grinding the fuel, preparing an air mixture,

feeding the latter into pulverized coal burners; and burning below the level of pulverized coal burners of highly reactive fuel in the presence of an oxidizing agent.

The disadvantage of this method is low efficiency, due to increased heat losses with flue gases, high consumption of high-distortion fuel, energy consumption for a blower fan.

The aim of the invention is to improve the economy.

This goal is achieved in that according to the method of burning fuel in a boiler plant, by supplying a drying agent and fuel, grinding the fuel, preparing an air mixture, feeding the latter into a pulverized coal burner and burning below the level of these highly reactive burners

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fuel in the presence of an oxidizing agent; a spent drying agent is used as the oxidizing agent when burning highly reactive fuel.

In addition, a portion of the spent drying agent is sent to the combustion zone below the level of the pulverized coal burners.

The drawing shows schematically a boiler plant for carrying out the proposed combustion method.

The boiler plant contains a mill 1, a separator 2, a dust separator 3, an intermediate dust bunker 4, a furnace 5 with pulverized coal burners installed on it, 6 additional burners 7 1 for burning highly reactive fuel. The burners 7 for supplying the oxidant are provided with a channel 8 connected via spent drying agent to the dust separator 3. The furnace 5 also has waste burners 9.

The installation works as follows.

During the operation of the boiler plant, the fuel and the drying agent enter the mill

1, where does the mixture enter the separator

2. The fine fractions of dust together with the drying agent are then fed to the dust separator 3, where the streams of dust and the drying agent are separated. The spent drying agent is sent to the additional burners 7 as a baking agent for burning highly reactive fuel. A part of the drying agent may be fed to the waste burners 9. The pulverized fuel from the hopper 4 is fed to the pulverized burners b. High reactive fuel (fuel oil or pribbdny gas) is fed to the combustion in the lower part of the furnace 5 through additional burners 7. When burning high reactive fuel together with the fine fractions of pulverized coal contained in the drying agent, the superfloor space of the furnace is heated, which allows the slag to be maintained in liquid state. At the same time, compared

with the prototype, heat losses with flue gases are reduced, due to a decrease in the air supply to the furnace, the consumption of highly reactive fuel is also reduced, due to the generation of additional heat from burning the fuel contained in the spent drying agent. In addition, the blower fan is discharged.

PRI me R, The boiler unit of the CCI-110 burns 34 kg / s of solid fuel. On

14.5 kg / s of air is supplied with a temperature of 573 K. 0.18 kg / s of natural gas and 7 kg / s of spent drying agent with a dust concentration (6-10)% and a temperature of 400 are supplied to additional burners (2 pcs.) K. Heat losses with flue gases are reduced by 0.016% and natural gas consumption by 30%. Energy savings due to unloading the blower fan is 0.15%, efficiency increases by 0.02%.

Claims (2)

1. The method of burning fuel in the boiler plant by supplying a drying agent and fuel, grinding the fuel, preparing an air mixture, feeding the latter into a pulverized coal burner and simultaneously burning below the level of pulverized coal burners of a highly reactive fuel in the presence of an oxidizing agent, characterized in that In order to increase efficiency, the spent drying agent is used as an oxidizing agent when burning highly reactive fuel. 2. Method pop.1, characterized in that part of the spent drying the agent is directed to the combustion zone above the level of the coal-burning burners, toll $ o sushi aze / tm fuel oil, gas7 X