SU1515006A1 - Chamber furnace for burning low-grade fuel - Google Patents

Abstract

The invention relates to a power system and can be used in boilers for the combustion of low-reactive fuel. The chamber furnace contains in the lower part a warmed zone 1 formed by screen tubes 2 with applied refractory insulation 3, moreover, the insulation is made with a variable thermal resistance increasing along the height of zone 1 from the hopper 6 to the cooling zone 4. This is achieved by performing insulation 3 s an increase in the height of zone 1 of the layer thickness or with a constant thickness of the insulation layer 3 from materials with a decrease in the height of zone 1 of the thermal conductivity coefficient. 2 hp f-ly, 1 ill.

Description

U ///, //.,

 /// ///.

///, //.,

 /// ///. / UTTTT

tj

I

"T"

I

(L

I

ate

SP

3151

11z (1breeze refers to heat and power engineering and can be used in power boilers 11d combustion: reaction fuel,

The purpose of the invention is to increase the efficiency of operation by increasing the active combustion chons.

The drawing shows the furnace, a longitudinal section.

The chamber firebox contains insulated zone 1 formed by screen tubes 2 with refractory insulator 1 3 applied to them. In addition, the fire chamber contains chambers A and 5 1 and cooling and, respectively, and in the lower part - bunker Br 6 for removing the donkey.

The furnace works as follows.

The gas mixture through the burners (not shown) is fed into the combustion chamber 4, where it ignites and burns. At the same time, the torch core with the maximum temperature level of the flue gases disperses along the axis of the furnace. By selecting the appropriate thermal resistance of the insulation layer 3 at the screen tubes 2 and at the outlet of the active combustion chamber 4, the gas temperature is set at the level at which the droplets of the formed donor harden and partially fall into the hopper 6, partially with the flue gases are carried into the chamber 5 cooling. In the bunker 6, where the gas temperature is lower, the donkey is granulated and free to remove it from the firebox in a solid form.

In the furnace, thermal insulation 3 is made with a variable thermal resistance increasing along the height of the warmed zone 1.

This is achieved by making the insulation 3 with the increasing thickness of the ch.cho zone or the constant thickness of the layer of materials with

I reduce the height of zone 1 by the coefficients of thermal conductivity.

In this way, a slight decrease in the gas temperature along the height of the warmed zone 1 is ensured by maintaining a balance between the heat release from the combustion of fuel and the heat sink to the surface 2.

The thermal resistance of the insulation 3 of the active zone of the chamber 4 is chosen such that the decrease in heat gap in the furnace height is compensated by a corresponding decrease in the heat sink.

This lengthens the active burning zone of the fuel, as the temperature maintained in the longer torch region is necessary for the active burning of low {) stock toppings. The result is an economical operation of the furnace.

Claims (3)

1. Chamber furnace for combustion of non-reactive fuel, containing in the lower part a warmed zone formed by screen tubes with a layer of insulative insulation applied on them, in order to increase efficiency by increasing the zone of active combustion, refractory insulation Made of material with increasing thermal resistance of the zone. 2. Chamber furnace according to claim 1, characterized in that the refractory insulation is made with increasing layer thickness along the zone. 3. Chamber furnace according to claim 1, which is characterized in that the refractory insulation is made with a constant layer thickness of materials with decreasing thermal conductivity coefficients.