Method of burning pulverized fuel

FIELD: methods of burning pulverized fuel.

SUBSTANCE: proposed method includes preparation of fuel for burning, delivery of fuel, transportation of high-pressure air, mixing air with pulverized fuel and delivery of high-concentrated aeromixture to boiler burners. Transporting air is ozonized before mixing it with pulverized fuel ; part of ozonized fuel is delivered to transport of pulverized fuel and remaining part is delivered autonomous passage of burner to flame root via pipe line.

EFFECT: steady ignition of pulverized fuel; enhanced efficiency of burning process.

2 dwg

 

The invention relates to the field of power engineering, in particular to a method of burning pulverized fuel.

One of the problems of power system is to ensure efficient combustion of lean coals in special devices, as well as in combustion devices, General purpose, designed to burn coal with a wide quality range.

There are several ways to improve the ignition and combustion of pulverized skinny coals: backlight coal-dust flame fuel oil, warming zone of initial ignition, the increase in the volume of the furnace, the thinning grinding coal dust. The implementation of these measures at the existing boilers require a large expenditure of scarce and expensive fuel oil fuel, high cost of renovation, not all design solutions are acceptable for various coals (slagging, breach of explosion, the reliability of the heating surfaces). Therefore, in the conditions of variable fuel quality and lack of operational quality control of coal necessary decisions, ensuring reliable and efficient operation of the boiler during operation of the latter on various coals.

There is a method of optimization of the combustion process by affecting the kinetics of the process of ignition and combustion of coal dust by ozonization of air, Postup is found on combustion and performs the function of the oxidizer. (Air, Euaworci. On the role of active centers in the processes of ignition and combustion of fossil fuels. “Combustion of solid fuels”. Novosibirsk: Nauka, Siberian branch, 1969, No. 2, p.132-139; Yevkurov, Blegen, Iwire etc. To the issue of increasing the combustion efficiency low reactivity of coals. Izvestiya Vuzov, Energy. Minsk, 1990, No. 2, p.70-75).

The disadvantage of this method is the high consumption of zoneremove air, which requires significant energy consumption for its production, reaching 7-8% of the total power plant capacity (per kg zoneremove air spent about 0.2 kW of electricity, which corresponds approximately to the flow rate of 0.5-1.0 kW per kilogram of burned coal), which is an obstacle for the industrial implementation of the known method of ozonation.

A known method of burning pulverized fuel, including the preparation and submission of pulverized fuel, transportation of high pressure air, mixing it with a pulverized fuel supply highly concentrated mixture in the burner of the boiler. (Wmiff, Nagsasabing and other Application delivery system dust with a high concentration on boilers PK-40. // Electric station, 1984, No. 2, p.15-16, figure 1).

The disadvantage of this method is unstable ignition of dust skinny coals due to the slow mixing of the coal is Oh dust and primary air in the boiler furnace.

The technical task to be solved by the invention, is to provide stable ignition of pulverized coal by the process of combustion and the efficiency of the combustion process.

For the technical solution provide a method of burning pulverized fuel, including fuel preparation, delivery, transportation of high pressure air, mixing it with a pulverized fuel supply highly concentrated mixture in the burner according to the invention produce ozonation transporting air before mixing it with the powdered fuel in this part of the ozonized air serves to transport pulverized coal, and the remainder is served by pipeline to an offline channel of the burner to the root of the torch.

Ozonation of transporting air, which is fed through the burner of the boiler is a highly concentrated mixture is more than 1% of the flow rate of air needed for combustion, reduces (by several orders of magnitude) consumption of ozone compared with the known method ozonation General air going to the combustion. This greatly increases the efficiency of the process of burning pulverized fuel with the use of ozone and ensures its implementation. In the case of applying the Asti ozonized air in the offline channel the burner is provided to further increase the stability of the torch.

Implemented the proposed method as follows.

On-line transport of the high-pressure air set ozonator, through which high pressure air otnerwise and duct flows into the mixer where it is mixed with a stream of pulverized fuel and then highly concentrated Aerosmith fed to the burner of the boiler. When moving through the tract and the output flow mixture in the furnace in the initial part of the flame in the presence of ozone, there is preparation of pulverized coal to the combustion: decomposition of ozone is created by atomic oxygen, which combines with volatile coal, acting on free radicals and breaking the weak links in the chains of the macromolecules of the coal substance, increases the number of active centers, which create a chain reaction and provide a lower ignition temperature. In addition, there is formed a high concentration of oxidant that improves the conditions of ignition at the entrance of the mixture into the furnace. The presence of ozone in the composition of the concentrated mixture ensures the formation in the initial part of the flame source initial ignition of coal dust and stimulates the ignition of the main mass of the dust.

Possible removal of ozonated high-pressure air separately is in the pipeline in the offline channel of the burner to the root of the torch.

Figures 1 and 2 show schematic implementation of the proposed method.

The circuit contains a source of high pressure air 1, air 2, pylupdate device 3, a mixer 4, between the source of high pressure air is 1 and the mixer 4 is the ozonizer 5, the mixer 4 is connected with a burner 6 via pipeline.

Possible and other technology combustion of pulverized lean coals, when some of the ozonated high-pressure air is supplied into the mixer, and the remaining part is fed directly to the offline channel burner.

This option is implemented using the circuits shown in figure 2.

The proposed scheme the implementation of the proposed method of burning pulverized skinny coal contains a source of high pressure air 1, air 2, pylupdate device 3, a mixer 4, between the source of high pressure air is 1 and the mixer 4 is the ozonizer 5, the mixer 4 is connected with a burner 6, the exhaust tube part ozonated high-pressure air 7 connecting duct 2 with the offline channel 8 of the burner 6.

Calculation of efficiency of ozonation minimum air quantity at the combustion skinny type coals ASH shows that a significant reduction in flow of ozonized air, achieved by the proposed method provides the value is positive economic effect by increasing the burning of coal dust (fuel) and by avoiding the use of expensive oil, used for illumination of a torch.

The analysis of the results of the search by the patent and scientific literature leads to the conclusion that the proposed set of essential features not known from the prior art. Therefore, the proposed solution meets the criterion of “novelty.”

Given the low operating costs and a limited amount of reconstruction of the transport of dust, the proposed method meets the criteria of the invention “industrial applicability”.

Thus, the proposed method of burning pulverized coal allows to solve the problem of burning lean coals, to improve the efficiency of the process of combustion, significantly reduce the energy consumption for the ozonization of air.

A method of burning pulverized fuel, including fuel preparation, delivery, transportation of high pressure air, mixing it with a pulverized fuel supply highly concentrated mixture in the burner of the boiler, characterized in that the produce ozonation transporting air before mixing it with the powdered fuel in this part of the ozonized air serves to transport pulverized coal, and the remainder is served by pipeline to an offline channel of the burner to the root of the torch.



 

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