SU1657863A1 - Chamber furnace - Google Patents

Abstract

The invention relates to energy and m. used in thermal power plants. The purpose of the invention is to increase efficiency. The cutoff axis of the mouth of the cold funnel 2 is equipped with nozzles 4 for supplying the ejection medium, which, due to the suction of flue gases, creates a downward flow of hot gases to the mouth 5 of the cold funnel 2. The flue gases and the ejecting medium impact the flame from the bottom upwards, reduce heat stress of the furnace volume in the area of the burners 3 and eliminates the slagging of shielded walls of the chamber 1, which provides increased efficiency. 2 Il.

Description

The invention relates to energy and can be used in thermal power plants.

The purpose of the invention is to increase efficiency by reducing slagging and heat loss with mechanical burning.

Figure 1 shows a firebox, a longitudinal section; figure 2 is a section aa in figure 1.

The chamber furnace contains a shielded vertical prismatic combustion chamber 1 with a cold funnel 2, a burner 3 and a nozzle 4 for supplying an ejection medium symmetrically installed along the cut axis of the mouth 5 of the cold funnel 2 with a step equal to 0.44 N, where N is the height from the mouth cut 5 funnels to the axis of the burners 3.

The furnace works as follows.

Coal dust in the form of a mixture through a burner 3 is fed into the chamber'1, where it burns in a torch. Through nozzles 4. located at the mouth 5 of the cold funnel 2, an ejection medium (for example, steam, air, combustion products or mixtures thereof) is supplied to the combustion chamber 1 in an amount of 2-7% of the total amount of flue gases generated during fuel combustion.

The ejection medium, leaving the nozzles 4, ejects the flue gases filling the cold funnel 2 and transfers them to the core of the torch. Moreover, due to the constant suction of new volumes of gases into the ejection medium along the shielded walls of the chamber 1, a downward flow of hot flue gases to the mouth 5 of the cold funnel 2 is formed, starting from the level of the burners 3.

An increase in the temperature level in the near-wall zone of the screens contributes to a greater and more uniform heat perception of the shielded walls of the chamber 1, which are below the level of the burners 3.

As a result of exposing the torch from the bottom up to the funnel 2 that has given its heat to the flue gases and the ejection medium, the heat stress of the flue volume in the region of the burners 3 is significantly reduced and the slagging of the shielded walls of chamber 1 is eliminated. 2 so that flue gases are sucked in immediately at the beginning of the cold funnel. Nozzles 4 are installed with a step equal to 0.44 N, where N is the height from the cut of the mouth of the funnel to the axis of the burners 4, which makes it possible to obtain a uniform upward flow when exposed to the torch, opening across the entire width of the furnace.

A chamber furnace allows increasing the boiler efficiency by reducing the mechanical underburning of fuel by 0.5-1.5% and eliminating its slagging.

Claims (1)

Claim Chamber furnace for burning high-pressure highly slagging coal dust containing shielded vertical prismatic combustion chambers with a cold funnel, burners and nozzles for supplying an ejection medium, characterized in that, in order to increase efficiency by reducing slagging and heat loss with mechanical burning, at least two nozzles are symmetrical are installed along the axis of cut of the mouth of the cold funnel with a step equal to 0.44 N, where N is the height from the cut of the mouth of the funnel to the axis of the burners.