RU230913U1 - Torch burner for solid fuel dust mixtures - Google Patents

Abstract

The utility model relates to burner devices used in boilers in thermal power engineering or in heat generators for drying units. A flare burner operating on a solid fuel dust mixture contains two fuel receivers arranged sequentially one after the other in the direction of the flare outlet from the burner into the furnace, and an ignition device. The utility model contains two housings, to the first of which, along the direction of fuel movement, a fuel receiver of a highly flammable solid fuel dust mixture, a combustion air inlet and an ignition device are connected, forming the first combustion stage, and to the second housing a fuel receiver of a hardly flammable solid fuel dust mixture, a combustion air inlet are connected, forming the second combustion stage, wherein the second stage covers the first, and the first combustion stage is designed with the possibility of igniting the fuel mixture in the second stage. The ignition device is an electroionization ignition device.

Description

The utility model relates to the fuel industry and energy and can be used at thermal power plants, boiler houses and other similar facilities to ensure independent ignition and stabilization of combustion of pulverized coal and water-coal fuel mixtures without the use of additional ignition fuels. This flare burner relates to burner devices used on boilers in thermal energy or on heat generators for drying units.

A flare burner is known from the prior art (patent 2,731,081 C1 dated 17.04.2020, F23Q 5/00, F23D 1/00, Fig. 2), comprising a housing with two fuel inlets installed in it, arranged sequentially one after the other in the form of stages, characterized by the following disadvantages:

1. The fuel inlet of each stage has its own separate ignition unit.

2. Air is supplied to the second stage without the possibility of heating it using the heat released in the first stage.

3. When heated, the first stage housing complicates the operation of the flare burner, since it requires additional protection from the hot surface of the first stage housing in the operating area of the service personnel.

4. The flare burner does not provide ignition from a cold state of difficult-to-ignite solid fuel dust mixtures, including anthracite dust, high-ash coals such as Ekibastuz, low-calorie coals such as lignite, etc.

The task that the declared technical solution in the utility model is aimed at solving is to eliminate the above-mentioned shortcomings.

The technical result of the claimed utility model is the ignition from a cold state of hardly flammable solid fuel dust mixtures, including anthracite dust, high-ash coals such as Ekibastuz, low-calorie coals such as lignite, etc.

The technical result is achieved by separate and sequential placement of fuel receivers for highly flammable and hardly flammable fuel dust mixtures in the burner.

In this case, the flare burner includes:

the first combustion stage, in which a fuel receiver for the flammable dust mixture, an air inlet and an ignition device are installed;

the second stage consisting of a fuel receiver for a flame-retardant dust mixture and an air inlet.

Moreover, the second stage body embraces the first stage body in such a way that the torch from the first stage exits from it into the cavity of the second stage body, where it can mix with the flame-retardant dust mixture of the second stage.

In addition, the second stage air inlet is positioned so that the second stage air has the ability to make maximum contact with the first stage housing, which ensures that this air is heated by the heat of the first stage torch. In this case, the cold air of the second stage covers the hot surface of the first stage and protects the service personnel from contact with the hot surface of the first stage housing. In addition, a separate ignition device is not required for ignition of the second stage, since ignition of the second stage is provided by the torch of the first stage.

The device is explained by a drawing, which shows the burner in working condition.

The flare burner includes a first-stage body 1, to which a first-stage fuel receiver 2, a first-stage air inlet 3, a first-stage ignition device 4 are connected. A second-stage body 5, to which a second-stage air inlet 6 is connected, a second-stage fuel receiver 7. The second-stage body 5 covers the first-stage flame outlet zone 8. At the junction of the first-stage flame zone 8 and the second-stage fuel inlet from the fuel receiver 7, a second-stage ignition zone 9 is formed, which passes into the zone of the common burner flame 10, which exits into the furnace.

Ignition device 4 can be implemented in the form of an electro-ionization ignition device (hereinafter referred to as EID).

The burner works as follows.

When starting the burner, air is supplied to the first stage through air inlet 3 and air to the second stage through air inlet 6. After this, highly flammable solid fuel dust mixture is supplied through fuel receiver 2 and ignition device 4 is switched on. Ignited dust in the form of torch 8 comes out into the cavity of the second stage 5. The air of the second stage protects the outer part of the burner body from the side of access of service personnel. In this case, the air of the second stage is heated due to contact with the surface of the first stage in the zone of action of torch 8. Then, hardly flammable solid fuel dust mixture is supplied to the second stage through fuel receiver 7. When mixing the torch of the first stage 8 with the dust mixture of the second stage from the fuel receiver 7 and the heated combustion air of the second stage, the hardly flammable solid fuel dust mixture ignites in zone 9. As a result, a common torch 10 is formed at the burner outlet, in which both flows of dust mixtures burn, ensuring conditions for complete combustion of dust mixtures in the furnace.

These materials present a preferred disclosure of the implementation of the claimed technical solution, which should not be used as limiting other, particular embodiments of its implementation that do not go beyond the requested scope of legal protection and are obvious to specialists in the relevant field of technology.

Claims (2)

1. A torch burner operating on a solid fuel dust mixture, containing two fuel receivers arranged sequentially one after the other in the direction of the torch outlet from the burner into the furnace, an ignition device, characterized in that it contains two housings, to the first of which, in the direction of fuel movement, a fuel receiver of a highly flammable solid fuel dust mixture, a combustion air inlet and an ignition device are connected, forming the first combustion stage, to the second housing a fuel receiver of a hardly flammable solid fuel dust mixture, a combustion air inlet are connected, forming the second combustion stage, wherein the second stage covers the first, and the first combustion stage is designed with the possibility of igniting the fuel mixture in the second stage. 2. A flare burner according to item 1, characterized in that the ignition device is an electro-ionization ignition device.