Embodiments provide a combustion structure that can achieve stable combustion by addressing the aforementioned drawbacks in the prior art such as low flame stability, backfire, deflagration, blockage and/or any other drawbacks. The combustion chamber structure in accordance with the disclosure can include: a grate structure including a first set of elongated components, a fire retention structure including a second set of elongated components. The first set of first elongated components can be arranged along an axial direction within the combustion chamber structure. The second set of elongated components can be arranged along the axial direction in a same direction as the first elongated components. The second set of elongated components can be configured to generate a negative pressure zone within the combustion chamber. The first set of elongated components can form apertures that can be aligned with apertures formed by the second set of elongated components.

The grate includes a number of grate lanes arranged side by side between a left and a right side section, neighbouring lanes being connected by a midsection and including a lane section having a number of pivotal grate shafts carrying grate bars. Each midsection includes an upper relatively narrow housing section arranged between grate bars of neighbouring lanes and a lower relatively broad housing section protruding under grate bars of said lanes. The upper housing section of each midsection encloses bearings for grate shaft ends of neighbouring lanes. At least one midsection includes a drive mechanism for pivoting back and forth neighbouring grate shafts in opposite rotational directions and a synchronising mechanism of at least one lane section. An actuator of said drive mechanism and said synchronising mechanism are located in the lower housing section of said midsection.

The grate includes a number of grate lanes arranged side by side between a left and a right side section, neighbouring lanes being connected by a midsection and including a lane section having a number of pivotal grate shafts carrying grate bars. Each midsection includes an upper relatively narrow housing section arranged between grate bars of neighbouring lanes and a lower relatively broad housing section protruding under grate bars of said lanes. The upper housing section of each midsection encloses bearings for grate shaft ends of neighbouring lanes. At least one midsection includes a drive mechanism for pivoting back and forth neighbouring grate shafts in opposite rotational directions and a synchronising mechanism of at least one lane section. An actuator of said drive mechanism and said synchronising mechanism are located in the lower housing section of said midsection.

A cooling system for a grate bar of an incinerator of solid materials is provided includes a feed grate having a plurality of grate bars, at least one of the grate bars including a body having a top surface, a bottom surface, a first end and a second end, a first aperture in the body and a second aperture in the body, and an internal passageway defined within the body and fluidly connecting the first aperture to the second aperture, the first aperture arranged to receive a gas therethrough into the body, and the second aperture arranged to provide an egress for the gas out of the body. The cooling system further includes a manifold duct fluidly coupled to the second aperture for receiving the gas from the second aperture. The gas is independent of the primary combustion air of the incinerator.

Embodiments provide a combustion structure that can achieve stable combustion by addressing the aforementioned drawbacks in the prior art such as low flame stability, backfire, deflagration, blockage and/or any other drawbacks. The combustion chamber structure in accordance with the disclosure can include: a grate structure including a first set of elongated components, a fire retention structure including a second set of elongated components. The first set of first elongated components can be arranged along an axial direction within the combustion chamber structure. The second set of elongated components can be arranged along the axial direction in a same direction as the first elongated components. The second set of elongated components can be configured to generate a negative pressure zone within the combustion chamber. The first set of elongated components can form apertures that can be aligned with apertures formed by the second set of elongated components.

A cooling system for a grate bar of an incinerator of solid materials is provided includes a feed grate having a plurality of grate bars, at least one of the grate bars including a body having a top surface, a bottom surface, a first end and a second end, a first aperture in the body and a second aperture in the body, and an internal passageway defined within the body and fluidly connecting the first aperture to the second aperture, the first aperture arranged to receive a gas therethrough into the body, and the second aperture arranged to provide an egress for the gas out of the body. The cooling system further includes a manifold duct fluidly coupled to the second aperture for receiving the gas from the second aperture. The gas is independent of the primary combustion air of the incinerator.