SU1740869A1 - Furnace device - Google Patents

Abstract

The invention relates to the combustion of fuel and allows for improved efficiency. This is achieved by the fact that the central combustion chamber 4 of the furnace 3 is made in the form of an octahedral equilateral prism with four walls 6 shared with its peripheral combustion chamber 5, and the tangential burners 12 are placed on the other four walls located between the common walls 6. 2 Il. Aa

Description

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This invention relates to fuel combustion and can be used in thermal power plants.

A furnace device in the dust preparation system is known, which contains a mill-fan with a dust concentrator and a furnace equipped with a combustion chamber, equipped with a gas intake window connected to the inlet of the fan-mill, and the combustion chamber is equipped with burners connected to the branch pipe of the concentrated concentrator mixture.

A disadvantage of the known combustion device is the reduction in efficiency due to the complexity of the gas intake, which requires additional lining.

Known combustion device of the steam generator, containing a grinding and drying device and a furnace equipped with a central combustion chamber and peripheral channels having common walls with bypass windows with a central chamber. The peripheral channels located in the furnace are equipped with bottom gas intake ports connected to the suction of the drying and grinding devices, and the central combustion chamber is equipped with burners connected with the drying and grinding devices.

The disadvantage of this device is a decrease in efficiency due to a drop in temperature in the channels and the resistance exerted by the exhaust fan in the opposite direction of suction of the drying and grinding devices.

It is also known a combustion device containing a mill-fan with a dust concentrator and a furnace equipped with central and peripheral combustion chambers having a common wall with overflow windows. The peripheral combustion chambers are equipped with a vault burner and a bottom gas intake window connected respectively to the discharge pipe of the dust concentrator and the mill-fan, and the central combustion chamber is equipped with tangential burners connected to the branch pipe of the concentrated concentrator mixture.

The purpose of the invention is to increase efficiency.

The goal is achieved by the fact that in a furnace device containing a fan mill with a dust concentrator and a furnace equipped with central and peripheral combustion chambers having a common wall with a bypass window, the peripheral combustion chambers are equipped with a steam burner and a bottom gas intake window connected to the discharge tube of the dust concentrator and the suction of the fan mill, and the central combustion chamber is equipped with

tangential burners connected to the nozzle for discharging the concentrated mixture of a dust concentrator, the central combustion chamber of the firebox is designed as an octahedral equilateral

0 prisms with four walls shared with their peripheral combustion chamber, and tangential burners are placed on the remaining four walls located between the common walls, with the bypass window in the common walls being adjacent to the chamber arch. Such an embodiment of the central chamber, as well as the placement of the burners, allows for greater efficiency by eliminating corner stagnant zones.

0 in the central combustion chamber, increasing the heat supply due to the radiation component of the common walls, increasing the forced suction of hot gases through the peripheral chambers with the organization

5 of them are burning with radiant heat removal and illumination, avoiding shading of peripheral chambers, reducing underburning contained in the gas intake in front of the exit window in the roof of chambers, and reducing the amount of oxygen entering with the drying gases into the mill-fan, which allows the temperature to rise drying. The implementation of the bypass window with their junction in the common walls of the arch

5 chambers allow the dust ring, which is concentrated near the common walls, to be cut off with the help of bypass windows and directed to the afterburning in the torches of the arch burners, which sharply reduces the underburning coming through

0 exit window to convective surfaces of the boiler.

Thus, organizing a twist in the central combustion chamber with a flow stratification in front of the exit window into a dusty and slightly dusty and afterburning of the dust flow in the peripheral chambers when it is sucked out of the central chamber through the bypass windows at the roof where the flow is concentrated allows

0 to increase the efficiency of the firebox due to the organization of intense combustion in the angular peripheral combustion chambers with a simultaneous increase in the heat removal surface due to double-sided common walls.

5 Figure 1 shows the combustion device, a longitudinal section; figure 2 - section aa in figure 1.

The furnace device contains a mill-fan 1 with a dust concentrator 2 and a fire chamber 3, equipped with central 4 and peripheral 5 combustion chambers having common walls 6 with bypass windows 7. Peripheral combustion chambers 5 are equipped with arch burners 8 and bottom gas intake windows 9 connected respectively to the exhaust pipes of the Yupile-concentrator 2 and the inlet 11 of the fan mill 1. The central combustion chamber 4 is equipped with tangential burners 12 connected to the branch pipes 13 of the concentrated mixture of the dust concentrator 2. The central chamber 4 combustion of the firebox is made in the form of an octahedral equilateral prism with four walls b, in common with its peripheral chambers

5 burns, and tangential burners 12 are placed on the remaining four walls 14, located between the common walls 6. Bypass windows 7 in the common walls

6 are made with an adjunction to the arch of 15 chambers.

The furnace device also has raw coal feeders 16, which are connected with chutes to the suction side of 11 mills-fans 1, exit window 17 in the roof of 15 chambers and slag tap 18 in the hearth 19 chambers. The combustion chambers 5 may have slag tapes 20 in common walls 6, 19 chambers adjoining the hearth. The bypass ports 7 may overlap tube sheets 21, which are a continuation of the common walls 6. Against the gas intake windows 9, in the center of them are opposed to the flow in the suction duct 11 of the mill-fan 1, the cold gas recirculation return pipes 22 are installed to regulate the gas temperature entering the mill, serving and for stripping dust from entering the mill.

The combustion device operates as follows.

The raw coal from the feeder 16 enters the inlet 11 of the fan-mill 1, which simultaneously receives hot flue gases from the gas intake port 9, the temperature of which is controlled by the addition of cold recirculation gases from the recirculation exhaust fan through the nozzle 22 to the main stream to blow off dust the entrance to the mill.

In the fan mill 1, the coal is crushed, dried, and fed to a dust concentrator 2, which is divided into two streams: dust goes to the outlet pipes of the concentrated mixture and goes to the tangential burners 12 of the central combustion chamber 4, and to the waste pipes 10 of the concentrator 2 dust enters, going to the arch burners of 8 peripheral combustion chambers 5. As a result of the tangential supply of dust to the central combustion chamber 4, a vortex is formed in it, in which the central dust-free flow is removed through the exit window

17, and the underburning dust ring is sucked through the bypass ports 7 into chambers 5, where it is burned in the torches of the burners 8. This eliminates the underburning.

Oxygen depleted flue gases enter the suction 11 of the fan-mill 1, since oxygen burns out the peripheral combustion chambers 5. This increases the drying temperature.

coal in mills without the danger of pops in it. Due to the illumination of the torch due to the combustion of underburning in the burners 8, the radiative heat removal in the combustion chambers 5 increases, which increases the efficiency of the combustion device, since the corner stagnant zones are involved in the active dust-burning process. The slag from the firebox is removed through the entrance

18, and the slag formed in the combustion chambers 5 through tap-holes 20.

Thus, the organization of the vortex burning of dust in the central combustion chamber 4 with the entry of underburning into the combustion chambers 5 and afterburning it in the torches of the burners 8 of these chambers allows to increase the economy by reducing underburning and increasing heat removal from the common walls 6 that are double-colored dimensions of the furnace.

Claims (1)

Invention Formula A furnace device containing a fan mill with a dust concentrator and a furnace equipped with central and peripheral combustion chambers, having a common wall with a bypass window, each peripheral combustion chamber equipped with a roof burner and a bottom gas intake window, connected respectively: with the discharge pipe of the dust concentrator to the pump mill-fan, and the central combustion chamber is equipped with tangential burners connected to the outlet pipe of a concentrated dust concentrator mixture, characterized in that, in order to increase efficiency, the central chamber of the furnace is made in the form of an octahedral equilateral prism with four walls shared with its peripheral combustion chamber , and tangential burners are placed on the remaining four walls located between the common walls, and the bypass window in the common walls is made with an adjunction to water chambers. 1715