Efficient and low-emission gap type secondary air intake biomass furnace

Abstract

An efficient and low-emission gap type secondary air intake biomass furnace comprises a furnace body, which is formed by a furnace panel, an outer cylinder and poly crater baffles and is divided into an upper furnace chamber and a lower furnace chamber, wherein a fire block ring is arranged above the poly crater baffle of the upper furnace chamber; a propellant bottle is arranged below the poly crater baffle of the lower furnace chamber; a feeding pipe for being communicated with the cylinder wall of the outer cylinder is arranged on the cylinder wall of the propellant bottle; a poly crater flame outlet of which the inside diameter is less than that of the propellant bottle is formed in the middle of the poly crater baffles; and a gap is reserved between the propellant bottle and the poly crater baffles. According to the scheme of the invention, defects that oxygen supply in the furnace is insufficient, the firepower strength and the cooking thermal efficiency standards can not reach the standard, and the phenomena of black smoke emission, serious waste of thermal energy and higher manufacturing costs are caused, which are caused by the fact that the circumference of the top of the cone is small and an arranged secondary air intake hole is small because the conventional selectable biomass furnace product adopts a conic cylinder poly crater flame outlet structure of which the upper part is smaller and the lower part is bigger, are avoided; and the furnace is suitable for the majority of towns and villages resident households for use, and particularly suitable for residents in biomass fuel areas.

Description

technical field [0001] The invention relates to a high-efficiency and low-emission biomass furnace with gap-type secondary air intake. Background technique [0002] Although there are many types of biomass furnaces available for selection, the fire gathering outlets are not as strictly differentiated as the product types. Generally, 1.5 kg of Chinese fir firewood is used to burn 7.5 kg of water. The initial water temperature is 10°C. The firewood burns out in 30 minutes, and the water temperature is only 88°C. It is difficult to meet the firepower and cooking thermal efficiency. , according to the calculation formula of thermal efficiency, per kilogram of water per 1 ℃ is 4.18 kilojoules, that is, 4.18×7.5×78 is equal to 2445.3 kilojoules. It is 1.5×13000 equal to 19500 kJ, the total calorific value of 19500 kJ divided by the heat absorption of 2445.3 kJ is equal to 0.1254, the thermal efficiency is only 12.54%, which is lower than the thermal efficiency of 30% of the natio...

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Problems solved by technology

[0002] Although there are many types of biomass furnaces available for selection, the fire gathering outlets are not as strictly differentiated as the product types. Generally, 1.5 kg of Chinese fir firewood is used to burn 7.5 kg of water. The initial water temperature is 10°C. The firewood burns out in 30 minutes, and the water temperature is only 88°C. It is difficult to meet the firepower and cooking thermal efficiency. , according to the calculation formula of thermal efficiency, per kilogram of water per 1 ℃ is 4.18 kilojoules, that is, 4.18×7.5×78 is equal to 2445.3 kilojoules. It is 1.5×13000 equal to 19500 kJ, the total calorific value of 19500 kJ divided by the heat absorption of 2445.3 kJ is equal to 0.1254, the thermal efficiency is only 12.54%, which is lower than the thermal efficiency of 30% of the national standard for biomass furnaces, 30 minutes Multiplying 60 seconds equals 1800 seconds. Divide the total heat absorption by the total time, that is, 2445.3 divided by 1800 equals 1.3585. That is, the firepower intensity is 1.3585 kilowatts, which is lower than the national standard of biomass furnaces greater than 1.5 kilowatts, and there is black smoke emission

In addition, the secondary air inlet of the conical cylinder fire-gathering outlet structure is set on the top of the cylinder with a round hole. Obviously, the circumference of the conical top is small, and the secondary air inlet hole must be small, so the oxygen supply in the furnace will be reduced. Insufficient, the flame and flue gas stay in the furnace for a short time, the volatiles are not fully burned, the temperature in the furnace is not high, and the temperature of the fire outlet is not high. In addition, the height of the fire is not suitable for this type of furnace, and the heat energy is not fully utilized. , high production cost and other defects

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