FI65663C - ELDSTAD FOER EN AONG- HETVATTEN- ELLER VARMVATTENPANNA - Google Patents

Description

2 65663 linen, grate extending to the main grate, fixed or movable.

In the main grate, the fuel is supplied either completely or partially by gravity. The upper surface of the fuel layer, due to the gravity supply alone, forms the slope determined by the fuel inlet angle.

However, fluctuations in fuel quality, changes in supply or grate air pressures, or other disturbances can cause fuel to roll on the grate normally abnormally. As a result of the rollover, a lot of fuel goes to the bottom of the grate. Combustible fuel always contains ash at the bottom of the grate. In order to reduce combustion losses, the passage of combustible fuel with the ash to be removed should be prevented.

Slight overturning can be prepared by making the post-combustion part of the grate long enough and sufficiently horizontal. The fuel has time to burn out on the grate even when a rollover occurs. With the mechanical afterburning part, the flow of fuel can be adjusted so that the grate remains suitably covered with fuel.

However, if you want to prepare for severe fuel spills, there must be an obstacle in the way of the fuel spill. In most cases, the barrier wall is the barrier. However, in order to remove the ash, an opening must be provided from which the ash and combustible fuel can advance only in a layer of a specified thickness. The surface of the afterburner must then be sufficient to completely burn the combustible material before it enters the ash hopper. In current solutions, everything else is roughly in order, but flue gas removal in the incineration area is cumbersome.

In general, two different solutions are used, in each of which the rear wall of the firebox acts as a rollover barrier. In the second solution (Fig. 1), the movement of the fuel on the afterburning grate is opposite to the movement on the main grate. In it, the ash - and with it combustible fuel - passes forward from the gap between the lower end of the main grate and the afterburner grate. Completion should take place in the part of the afterburning grate below the main grate. From here, flue gas removal could only take place along very difficult to construct separate flues. These chimneys are normally 3 65663 left unbuilt, with the result that the fuel burns out incompletely.

In one of the solutions used (Fig. 2), the movement of the fuel in the afterburner grate section is parallel to the movement in the main grate. The strength of the ash and fuel layer is adjusted in connection with the upper edge of the opening in the rear wall and the afterburning grate. Completion should take place in the afterburner grate section, which is located outside the actual furnace area. Also here, flue gas extraction is not normally arranged.

The object of the present invention is to simplify the structure of a partition in a combustion chamber for controlling the combustion of a furnace equipped with a water circulation system. This object is achieved on the basis of the features of the invention set out in the appended claims.

The invention is based on the realization that instead of a separate massive partition structure, pipes connected to a water circulation system can be utilized when forming the partition. In this way, a light partition is obtained, through which the circulating water or steam circulates to recover heat while keeping the temperature of the partition so low that the partition and its supports are not damaged by the temperature. At the same time, the partition is easy to build. When the pipes running from the partition wall to the furnace wall do not form a massive barrier between the partition wall and the furnace walls, the combustion gases can easily flow upwards from behind the partition wall. Thus, the use of pipes provides flue gas ducts without special duct construction costs.

If a solution is used in which the partition support pipes pass through the fire duct, the heat transfer from the combustion gases from the exhaust combustion array to the circulating medium is improved.

The invention will now be described on the basis of the accompanying schematic Figures 3 and 4, which show two different applications.

The fuel enters the main grate 1 through the supply pipe 2 and enters the afterburner grate section 3 from the main grate. The upper surface of the fuel forms the surface 4. The fuel flow is obstructed by a partition 5 supported by pressurized pipes connected to the boiler rear wall 12. Between the partition wall and the afterburning grate there is an opening 6, 4 65663 from which the fuel enters only in the layer delimited by the height of the opening 6 to the afterburning area 3a of the afterburning grate. The palaxnic fuel must not enter the ash removal hopper 8 with the ash, but the upper surface 7 of the fuel should end in the final combustion zone 3a of the grate. The ash is removed to the hopper 8 by knocking or by means of a grate feed movement. Flue gases from the grate burn-up area are led to the furnace 13 through a smoke duct 9 formed by pipes of the rear wall 12 and a pipe lattice 10 opening into the furnace. By using pipes / branches bent or branched apart from the wall pipes / to support the partition wall 5, a smoke duct 9, 10 opening into the firebox 13 is formed between the partition wall 5 and the rear wall 12 f / without separate / / separate flue duct structures. /

Combustion air enters the air chambers 11a ... lld under the grate.

From there, air flows through the grate and the fuel bed, contributing to the combustion of the fuel. The air chamber lld below the grate combustion zone 3a can be maintained at a lower pressure than the other air chambers 11a ... 11c because the fuel layer in the combustion zone is thinner.

The examples given are only some embodiments of the invention and therefore do not limit it. Many different types of grate can come into play. There are numerous possibilities for shaping the flue 9, 10. Instead of back wall pipes, side wall pipes can also be used to shape the duct 9 and support the partition wall 5, especially if the grate is placed on the side wall of the firebox. Also, if the boiler is narrow, the side wall pipes can form a support for the partition wall 5. The support of the partition wall - especially in the old boiler - can also be arranged by means of pipes connected to the forced circulation, which, for example, pass across from one side wall of the furnace to another.

Claims (3)

5 65663 A steam, hot water or hot water boiler furnace comprising cooling pipes for heat transfer from a furnace, a solid fuel combustion grate (1,3), the grate having a post-combustion zone (3) and a forward direction of fuel combustion zone (3a), wherein the post-combustion zone (3) and a partition (5) is arranged between the combustion zone (3a), which restricts the access of fuel from the afterburning zone (3) to the combustion zone (3a) only in a layer of a certain thickness and which forms a separate flue (9,10) with the walls of the furnace (13) above the combustion zone ) for conducting flue gases from the combustion zone to the furnace (13), characterized in that the partition wall (5) is formed at least in part by pipes connected to the boiler's water circulation systems, to which any other parts of the partition wall are attached. Infant furnace according to Claim 1, characterized in that the pipes used to form the partition (5) are pipes bent or branched apart from the cooling pipes of the furnace (13). Fireplace according to Claim 1, characterized in that pipes connected to a separate forced circuit between two opposite walls of the firebox (13) are used to form the partition wall (5).