RU89669U1 - VORTEX DUST-BURNER BURNER WITH AEROSMIX DIRECT FLOW DIVIDERS - Google Patents

Abstract

1. Vortex pulverized coal burner containing a Central channel for placing the kindling device, sequentially located around the Central channel at least one annular channel for direct flow of the mixture with installed in each of them uniformly around the circumference of the plate flow dividers, each of which is made with a pointed inlet divider, and at least one annular channel of secondary air with a blade swirl installed in each of them, characterized in that Sekatel has a blade shape with unilateral oblique cut. ! 2. Vortex pulverized coal burner according to claim 1, characterized in that the cut angle is 20 ÷ 60 °.

Description

The utility model relates to a power system and can be used as a coal-dust burner for boilers of thermal power plants and industrial boiler houses.

Known is taken as the closest analogue of the utility model to a vortex dust-coal burner containing a central channel for accommodating a kindling device, sequentially arranged around at least one annular channel parallel to the central channel for direct-flow supply of air mixtures with lamellar flow dividers installed in each of them uniformly around the circumference , each of which is made with a pointed inlet divider, and at least one annular channel of secondary air with installed m in each of them with a scapular swirler [1]. According to [1], the inlet splitter of the air mixture flow divider has the shape of a blade with symmetrical double-sided oblique sections. When using flow dividers with such a divider, an air mixture is formed at the exit to the furnace with a concentration of fuel particles in the central part of the jet surrounded on both sides by layers of relatively cold primary air separating fuel particles from igniting high-temperature gas vortices sucked to the torch root from the active combustion zone , which creates conditions for increased emission of fuel nitrogen oxides (NOx).

The achievable result of the utility model is to reduce fuel NOx emissions from the combustion of pulverized coal to reduce environmental pollution or reduce the cost of purification of NOx gaseous products of combustion of such fuel.

This is ensured by the fact that in a vortex pulverized coal burner containing a central channel for accommodating a kindling device, at least one annular channel for direct-flow supply of air mixtures with each of them with lamellar flow dividers installed in each of them uniformly circumferentially of which is made with a pointed inlet divider, and at least one annular channel of secondary air with a blade swirl installed in each of them According to the utility model, the divider has the shape of a blade with a one-sided oblique cut. In this case, the cutting angle can be 20 ÷ 60 °.

Figure 1 shows a vortex pulverized coal burner according to a utility model in longitudinal section; figure 2 is a view of the burner from the furnace along arrow A of figure 1; figure 3 - distribution diagram of the jets of dust and primary air at the outlet of the channels of the air mixture between the flow dividers according to the utility model; figure 4 - the same between the flow dividers according to the closest analogue [1].

The vortex pulverized coal burner according to a utility model in a specific example comprises a central channel 1 (FIGS. 1, 2) for accommodating a kindling device in the form of a fuel oil nozzle 2, sequentially arranged around the central channel 1, an annular channel 3 coaxially with it for direct flow of air mixture, and two internal and the outer annular channel, respectively 4 and 5 of the secondary air with a blade swirl installed in each of them 6 and 7., respectively (Fig. 1). In the output part of the aerosol mixture channel 3, six plate flow dividers 8 are installed evenly around the circumference (Figs. 1-4), each of which is made with an inlet divider 9 having the shape of a blade with a one-sided oblique cut (Fig. 3). The cutoff angle α can be selected within the range of α = 20 ÷ 60 °.

Vortex pulverized coal burner according to a utility model operates as follows. First, fuel and air are supplied respectively to a kindling device (fuel oil nozzle 2) and a central channel 1. Then, air mixture and secondary air are respectively supplied to the annular channels 1-4. The internal and external flows of secondary air in the annular channels 4, 5, respectively, during straight-through movement along them are vortexed using scapular swirlers 6, 7. The flow of the air mixture moving directly in the annular channel 3 is divided by six dividers 8 into six jets, respectively. When entering the furnace, due to the 8 intervals between the jets formed by the dividers, each of the six jets of the air mixture is surrounded by high-temperature products of combustion with low oxygen content recirculating into the axial zone. The presence of dividers 8 of dividers 9 in the form of a blade with a single-sided cut forms an asymmetric shape of jets at the exit to the furnace, as a result of which solid fuel particles are concentrated at the jets boundary of the primary air transporting them (Fig. 3), which ensures that these particles contact directly with igniting high-temperature gas vortices formed at the ends of the dividers 8, and sucked up to the root of the torch from the zone of active combustion. This aerodynamic structure of the jets leads to a significant reduction in the emission of fuel NO _X. For comparison, figure 4 shows the aerodynamic structure of the jets of the mixture when performing dividers 9 in accordance with [1] in the form of a blade with symmetrical double-sided oblique sections. At the same time, at the exit to the furnace, a jet of mixture is formed with a concentration of fuel particles in the central part of the jet surrounded on both sides by layers of relatively cold primary air that separates the fuel particles from igniting high-temperature gas vortices, which creates conditions for increased emission of fuel NOx.

Information sources:

1. Patent US 6116171, NKI 110/263, IPC F23D 1/00? 2000.

Claims (2)

1. Vortex pulverized coal burner containing a Central channel for placing the kindling device, sequentially located around the Central channel at least one annular channel for direct flow of the mixture with installed in each of them uniformly around the circumference of the plate flow dividers, each of which is made with a pointed inlet divider, and at least one annular channel of secondary air with a blade swirl installed in each of them, characterized in that Sekatel has a blade shape with unilateral oblique cut. 2. Vortex pulverized coal burner according to claim 1, characterized in that the cut angle is 20 ÷ 60 °.