Variable-hole-diameter porous ceramic burning plate

Abstract

The invention discloses a variable-hole-diameter porous ceramic burning plate. A plurality of small holes are evenly and densely distributed in the gas inlet face of the variable-hole-diameter porousceramic burning plate, the diameter of the holes in the gas inlet face is less than the hole diameter of the gas outlet face, the hole sections can be in various shapes, the hole diameter going deep into a certain thickness range of the burning plate is invariant, then the hole diameter is gradually increased and can be increased in a V shape, a curved shape or a step shape, and all the holes penetrate through the burning plate vertically. The gas outlet face serves as a burning face. The hole diameter of the gas inlet face is less than the quenching distance required by wall surface quenchingof adopted fuel gas on a ceramic body, the hole diameter of the gas outlet face approaches to the quenching distance during quenching, and the minimum hole depth is greater than two times of the quenching distance. When various fuel gas is compatible, the gas inlet hole diameter is calculated in the minimum quenching distance, and the thickness is calculated in the maximum value. The hole diameter increasing area can be coated with a catalyst to promote rapider and more full burning, and the infrared conversion rate is increased. According to the variable-hole-diameter porous ceramic burningplate, burning stability can be improved, the flame speed can be increased, the burning ultimate range is expanded, and the pollutant discharging concentration is decreased.

Description

Technical field: [0001] The invention relates to a variable-aperture porous ceramic combustion plate, which belongs to the technical field of combustion. Background technique: [0002] At present, the combustion bodies of civil and industrial infrared burners mainly include ceramic combustion plates, metal corrugated plates, metal fiber braids, etc. Among them, ceramic combustion plates are widely used because of their low cost and good thermal stability. The honeycomb structure with constant and very small pore spacing, in order to be compatible with different gas species, such as liquefied gas and natural gas, its pore size should be smaller than the minimum quenching distance of each gas type in the ceramic body, and because the pore size is the same on the gas inlet and outlet surfaces , in the environment where the air is supplied by active wind pressure, the pressure of the mixed gas is high, which will lead to a faster airflow speed in most cases, more flames detached...

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Problems solved by technology

[0002] At present, the combustion bodies of civil and industrial infrared burners mainly include ceramic combustion plates, metal corrugated plates, metal fiber braids, etc. Among them, ceramic combustion plates are widely used because of their low cost and good thermal stability. The honeycomb structure with constant and very small pore spacing, in order to be compatible with different gas species, such as liquefied gas and natural gas, its pore size should be smaller than the minimum quenching distance of each gas type in the ceramic body, and because the pore size is the same on the gas inlet and outlet surfaces , in the environment where the air is supplied by active wind pressure, the pressure of the mixed gas is high, which will lead to a faster airflow speed in most cases, more flames detached from the surface of the combustion plate, and the temperature of the combustion plate is not high, which will affect the preheating effect of the intake air. Not good, the combustion temperature is relatively low, the infrared conversion rate is low, and more pollutants are generated. At the same time, it is not easy to form stable combustion in the case of lean combustion. When there is no secondary air supply, such as in a sealed combustion environment, it is required Strict requirements are placed on the ratio of gas to air

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