CZ18887U1 - Cylindrical furnace grate with T-shaped fire bars - Google Patents

Description

Technical field

The technical solution relates to a heating device, namely automatically controlled solid fuel boilers with cylindrical combustion.

Background Art

Until now, cylindrical grate-controlled automatic solid fuel boilers are fitted with flat trapezoidal gratings mounted on the slats of the grate and fastened from the sides with pins or lugs inserted into the slats. Another way is to insert similar flat grates between the slats of the grate and to prevent it from falling out by the peripheral sheets. Such solutions are known, for example, according to CZ 14623 U or CZ 15970 U.

However, these solutions usually exhibit a low lifetime of grates or whole grates mainly because these grates have an unsuitable profile from the point of view of cooling and heat dissipation and thus are extremely thermal stressed, which leads to deformation of grates and subsequent loss of boiler functionality. Also the laboriousness of production and assembly grates very high in these designs.

and? The above mentioned drawbacks are eliminated by a cylindrical combustion grate with shaped grates according to the invention.

The essence of the technical solution

The new construction of the grate according to the invention is based primarily on the optimum shape of the T-shaped gratings, these gratings being seated in U-shaped rails welded on the inner drum of the grate, connected to each other by locking rings secured by several tightening strips between the cylindrical grate faces.

The cylindrical grate consists of a different number of said grates according to the desired size of the grate.

Own grate according to the technical solution is a rugged unworked casting of so-called chrome cast iron or similar refractory material. On the sides of the web has a pen or. groove for tight slatting. thereby creating separate grate spaces on the grate for the controlled supply of combustion air to the active grate section and simultaneously cooling the grates. In the lower part there are two-sided cut-outs for securing the grate layers with a safety ring to the grate body and their mutual securing. The grate head is shaped for even distribution of combustion air through gaps between grates and fitted with a rib for fuel feed in the combustion chamber. The stability of the grate assembly is further ensured by setting the grate bars into the U-shaped rails described above on the inner drum of the grate and then pulling down the grate layers with a few pulling straps for both the cooked and grate faces.

This new technical solution ensures the most efficient heat dissipation from the grate (cooling) through the incoming combustion air, which is fed from the front of the grate into the inner part of the grate and then flows through the gaps into the fuel layer on the outer cylindrical surface of the grate. process. Grate material and their design with maximum possible cooling surface allows their long-term use at combustion temperatures of 1200 to 1400 degrees Celsius. This new technical solution significantly increases the service life of grates as well as the entire grate, since even at high combustion temperatures, extreme thermal deformations of grates and subsequent deformation and destruction of the grate do not occur. At the same time, this new modular solution enables very easy assembly and disassembly, (or replacement of individual grates) of virtually any lengths and different diameters (given by the number of grates in one row) using one dimensional size of the newly designed grate. In addition, the gaps after folding the grates into the circumferential layers create an even distribution of combustion air to the combusted fuel layer. which affects the quality of the combustion process.

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List of drawings in the drawing

1 shows a grate, FIG. 2 shows a cylindrical grate, FIG. 3 shows a cross-section of the grate, and FIGS. 4 and 5 shows details of the grate, FIG. fixing grates.

An example of a technical solution

The cylindrical grate 5 consists of four hundred gratings [seated in U-rails 2 welded on the inner drum of the cylindrical grate 5 joined together by locking rings 3 and secured between the ends of the cylindrical grate by 5 tightening tapes 4, of a T-shape, which has a feather pen on the sides, respectively. the groove for sealing the grates 1 and in the lower part is provided with double-sided cut-outs for securing the grate layers to the grate body and securing them to each other. The grate head i is shaped for uniform distribution of combustion air through gaps between grates X and fitted with a rib for fuel shift in the combustion space.

Industrial usability

The cylindrical grate with shaped grates according to the technical solution is usable mainly in automatic controlled boilers for solid fuels (brown coal, wood and vegetable pellets, biofuels, etc.) with the output of 100 to 700 kW, where the temperature in the combustion chamber is normally 1200 to 1400 degrees Celsius and can successfully solve not only the problems associated with high fuel calorific value and intensive combustion, but also substantially reduce the operating costs of these boilers and extend their life.

Claims (2)

PROTECTION REQUIREMENTS A cylindrical combustion grate with shaped grate formed from a rotating hollow cylinder, characterized in that. that it is provided on its circumference with T-shaped gratings (1) with a contoured head provided with a fuel displacement rib seated in U-rails (2) welded to the inner drum of the cylindrical combustion grate (5) connected to each other by retaining rings (3); secured between the faces of the cylindrical combustion grate (5) by the tightening strips (4). Cylindrical combustion grate according to claim 1, characterized in that the grate (1) is an untreated cast of refractory material and is provided with a tongue and / or groove on the side of the web for tight fit of the grate (1) and in its lower of the part is provided with double-sided cutouts for fastening the layers of grate (1) with retaining rings (3). 1 drawing