FI92520C - Maze chamber - Google Patents

Description

9 9 S 9 Π

SOCKET CHAMBER

The invention relates to a wood waste combustion boiler firebox and an associated foot-burning space, i.e. a hot chamber, on which two basic requirements are usually set;

The minimum flue gas temperature after the hot chamber must be at least 800 ... 1000 ° C,

The flue gas should linger in the hot chamber for at least 0.5 ... 1 s. Conventional fireboxes and foot-burning spaces are uniform spaces formed by either charm or lithium 10. As a natural consequence of such a design, there is an uneven temperature in different parts of the chamber. The flue gas flowing in the center is usually hot enough at low powers, but in the vicinity of the walls the temperature remains so low that the hydrogen cyanide formed in the pyrolysis of the chipboard does not burn but goes with the flue gas 15 to the outside air. 11 mib has been clearly demonstrated in a study by VTT's HVAC Technology Laboratory: "Fasting in Lamp Production in the Furniture Industry / VTT 1254".

The object of the invention is to obviate this disadvantage by achieving a sufficiently high and uniform temperature which, under oxidizing conditions, converts hydrogen cyanide into nitrogen and carbon dioxide gases as well as water vapor.

Keskinno is characterized by what is presented in the symbol part of the main claim.

25

The average will be described in detail below by means of an operation example, with reference to the accompanying drawing. Figure 1 shows a section of a wood waste: combustion boiler (1) seen from the side. The wood waste (3) burning on the grate (2) is burned to completion by means of additional air (4) in a furnace (5), 30 from which the flue gas passes through the outlet (15) to the cooling section (6) and from there through the flue (7) to the outside air. Figure 2 shows a side section of the above-mentioned wood waste combustion boiler (1) after the modification work according to the invention. A service door (8) and water-cooled support pipes (9) have been installed on the side wall of the firebox (5) above the combustion chamber.

35 The walls and roof of the firebox above the support pipes are lined with fireproof thermal insulation (10). Mounted on the support tubes are ceramic moldings (11) which form the base for the partition walls (13) of the maze chamber (12). The fire gas rises into the labyrinth chamber from the opening (14) and exits through the opening (15) to the boiler cooling section (6) as well as ku-4’C pulp 1, but support columns (16) are installed in any opening.

-2- 92520

Alternatively, instead of the maze chamber according to Figure 2, a solution according to Finnish patent 84750 (F23 G 5/16) can also be applied, in which the flue gas is directed in the hot chamber as a vertical flow alternately 45 downwards and upwards. Technically, however, it is more cumbersome because the thermal insulation of the roof of the hot chamber requires the use of terrace-conducting terrace roads and vaulted structures must be made under the walls for the flow channel. In the horizontal flow solution according to Fig. 2, the thermal insulation of the roof remains on the cover brick of the flow channel and the cover points of the flow channel 50 are formed on their own when the labyrinth wall (13) is inflated, without special structures.

II

Claims (1)

CLAIMS -3- 92520 A refractory maze chamber (12) to be installed in the firebox (5) of a wood waste incinerator, the function of which is to control the flue gas flow generated during combustion as hot as possible so that harmful hydrocarbon compounds decompose and oxidize, the maze structure consists of two or more gas flow diverting partitions (13 and 16) and outer walls (10 and 11) made of refractory laminate insulation material which prevent the lamina from leading to the firebox surfaces and that the flow cross-section at the maze inlet (14) . 92520 I eldstaden (5) av en panna for forbrånning av stringesavfall in-monterbar labyrintkambare (12) vårs uppgift ärt styra den rockgasstromning som upstår under upbrånningen så som moj-ligt sà og-ligt så, de skadliga kolvåteforeningarna sonder The labyrinth construction is designed to meet the requirements of the internal gas supply (13 and 16) and the internal gas supply (10 and 11) of the energy-insulating material (14 and 11). ) and all of these densities (15). II