Boiler in the kang

The kang is an earthen or brick sleeping place for protection from the cold while you sleep.

Disadvantages of the "kang": waste of effective resources (wood consumed in heat production, etc.); not environmentally friendly (pollutants produced by combustion that affect both people and the environment); labor-intensive heating (manual operation); temperature control is not easy to grasp; and its application is not widespread (limited to rural areas).

Burning fire kang needs stove, fire kang is not good, most of the problems will appear in the stove.

China's traditional old-fashioned stove has one not, two high, three big, four no drawbacks:

One not: ventilation is unreasonable. The old stove does not have a ventilation channel (ash kang), only by adding firewood mouth ventilation, from adding firewood mouth into the air can not be directly through the fuel layer and fuel blending uniformity, so the fuel can not be fully combusted.

At the same time, a large amount of cold air coming in from the wood-adding port lowers the temperature inside the stove and takes away part of the heat when it passes the fuel surface, which prevents some combustible gases and carbon from being fully oxidized. As the saying goes, "if you don't ventilate under the stove, the firewood must be

born; if you want to burn well, you have to pick and burn".

Two high: high pots and pans, high hanging fire. The old-style stove only consider the convenience of cooking and add firewood to save energy, but did not pay attention to the fuel burning and saving. Whether the pot with the pot

are built very high, the pot umbilical cord and the ground is a great distance, so that the flame can not fully contact the bottom of the pot, a lot of heat energy are lost. This kind of stove is slow to open the pot and takes a long time to cook, which means that "the pot is higher than the kang, and the smoke is choked back; the distance between the hanging fire

is high, and the firewood is burned in piles".

Three big ones: the big wood-adding mouth, the big stove, and the big smoke-entry mouth (stove throat). The old stove because of this "three big" so that the stove flame is not centralized, the fire red, stove temperature is low. There is no fire ring in the stove, firewood on fire to run to the stove throat eye, the fire into a diagonal line, the flame stays in the chamber for a shorter period of time, increasing the loss of combustion heat radiation, so that a part of the heat from the stove door and smoke inlet ran away for nothing.

Four no: no grate, no door, no fire ring, no stove eye insert. The old stove because of no grate to make the stove ventilation effect is not good, the fuel can not be fully combusted, the phenomenon of burning and smothering carbon. Due to add firewood mouth no door,

a lot of cold air from the door into the stove, reducing the temperature inside the stove, affecting the combustion effect, increasing the heat loss. Due to the stove chamber without fire ring, so that the stove flame and high temperature smoke in the stove to stay a short time, the flame run

to the stove throat can not be fully contact with the bottom of the pot, the bottom of the pot heating area is small, slow cooking, long time, the cost of fuel. Due to the old-style stove without stove throat eye insert, thus causing the stove throat eye flue left small, no wind days when the pumping force is small, the smoke is

exhausted, appeared prairie smoke, pressure smoke and do not like to start a fire; stove throat eye flue left large, in the wind days, the kang pumping force, smoke and fire and all pumped into the kang, do not like to open the pot, slow cooking and other phenomena. At the same time, the stove does not keep

warm, the kang cool quickly, but also increased the smoke loss. So: the old-style stove costs firewood, coal, labor, time and low thermal efficiency.