SU1636630A1 - Air jet furnace - Google Patents

Abstract

Invention m. used in thermal power plants. The purpose of the invention is to prevent slagging when changing the thermal performance of the fuel. The aero-rotational firebox contains an ignition chamber 1 with a side nozzle 2 for fuel inlet, a lower axial air pa tube 3 and a nozzle 6 for introducing cold inert material connected through the acceleration-transport part 4 to the combustion chamber 5. With increasing temperature) in the volume

Description

df.

WITH&&

f.

/

/ 7/5

with Ј

/)

 i

and with

oh

05

with

A cold inert material is fed into the ignition chamber 1 due to intensive mixing in the volume of the ignition chamber 1. The invention relates to devices for burning fuel and can be used on thermal power stations.

The purpose of the invention is to prevent slagging when changing the thermal performance of the fuel.

The drawing shows aero fountain - on the firebox, a longitudinal section.

The aero-firebox contains an ignition chamber 1 with a side inlet 2 of the fuel inlet and a lower axial air inlet 3 connected through a transport section 4 with the combustion chamber 5. On the side surface of the ignition chamber 1 there is an inlet 6 inlet of cold inert material. A burn stabilizer 7 is installed at the outlet of the combustion chamber 5. The axis of the nozzle 6 input of inert material in the horizontal plane is located at an angle of 15-180 ° to the axis of the nozzle 2 fuel input

Aerofontan firebox works as follows.

The ignition chamber 1 is fed through the nozzle 2 heated to the ignition temperature, for example, in installations with solid coolant from the semi-coking reactor (not shown), and through the nozzle 3 - the air The largest fractions of fuel accumulate in the ignition chamber I which is the speed of vitalization p avna or more than the speed of the transporting medium. Here they are ignited and abraded. The presence of large fractions of fuel in chamber 1 of ignition intensifies the process of ignition of smaller fractions. But as the hot mass of coarse fractions burns out and is worn out, they are transported to the accelerating and transport section 4 of the airfont firebox. Here, the fuel particles are not only accelerated to the required for a stable font.

inert material and the supplied fuel eliminates local slagging. Thus, the supply of cold inert material to the ignition chamber 1 makes it possible to regulate the temperature of 1 hp. f-ly, 1 ill.

Q

5 o

about with, Q,

 j

5 speeds in the chamber volume, but they also carry out the process of further intensive oxidation of the combustible mass of fuel. Studies show that the smallest fractions of fuel burn out in the acceleration and transport section 4

In the volume of the combustion chamber 5, an air conducting layer is organized with a high multiplicity of internal circulation of the material. The required residence time of the fuel in the volume of chamber 5 depends on a number of factors, including its geometrical dimensions, the degree of cross section in the light of the combustion stabilizer 7, the speed of blast air at the mouth of chamber 5, the particle size of the crushing of the material particles, and also determined by the reactivity of the fuel. As the fuel particles wear out and burn out, they are carried away by the flow of flue gases from the zone of active combustion and further from the aerophonic secret furnace. An important condition for the sustainability of the operation of the furnace is that the temperature in the volume of the airflow chamber is lower than the softening temperature of the ash. Otherwise, slagging will occur, which will lead to the formation of goats in the elements of the airflow chamber and the circulation of material in its volume. The factors determining the level of temperature in the volume of the air-jet firebox are the caloric content, the amount and temperature of the thermally prepared fuel entering through the nozzle 2, the amount and Testing of the blast air entering through the nozzle 3, as well as the level of mechanical incomplete combustion of the combustible mass in the ashes

In the event that the temperature in the volume of the air inlet chamber is not maintained below the softening temperature of the ash, a cold inert is fed to the ignition chamber 1 through the pipe 6.

the amount of material that provides the temperature in the volume of the air chamber of the secret fire below the temperature of the ash softening. Due to the intensive mixing in the volume of the ignition chamber of the cold inert material and the fuel supplied, the local slagging possible in circulating fluidized bed furnaces is eliminated.

The axis of the nozzle of the inert material in the horizontal plane should be located at an angle of at least 15 P with respect to the axis of the nozzle of the fuel inlet to prevent disturbance of stable mixing in the ignition chamber.

Thus, the supply of cold inert material to the ignition chamber 1 makes it possible to regulate the temperature in the volume of the airflow chamber and to maintain it at a level below the softening temperature of the ash.

6630

Formula and

6

3 o

bratis

0

five

0

1. Aerofontan firebox containing an ignition chamber with a side fuel inlet and a lower axial air inlet, connected through the acceleration and transport section with a combustion chamber, different from the one in order to prevent slagging when the heat-engineering characteristics of the combusted fuel change, on the lateral surface of the chamber ignition is installed pipe inlet cold inert material,

I ,.

2. A furnace according to claim 1, characterized in that the axis of the inlet material inlet pipe in the horizontal plane is located at an angle of 15-180 ° to the axis of the fuel inlet pipe.

Claims (2)

Claim 1. Aerial firing chamber containing an ignition chamber with a side fuel input pipe and a lower axial air pipe connected through an accelerating-transport section with a combustion chamber, characterized in that 'in order to prevent slagging when changing the thermal characteristics of the combusted fuel, on the side surface of the chamber Ignition installed pipe input cold inert material. 2. A furnace according to claim 1, characterized in that the axis of the inert material inlet pipe in the horizontal plane is located at an angle of 15-180 ° to the axis of the fuel inlet pipe.