Chapter 1284 Frequent Events29

1.

At this time, it is already ten o'clock in the morning, and if the work of the pot stove and chimney can be completed within one day according to the progress of this project, it may be possible to start testing the fire tomorrow.

After a short rest, everyone moved outside the wall of the courtyard under the command of Master Liu and began the work of building a chimney.

Compared with the pot stove, the chimney can be a little easier, and the technology is not so strong, that is, it is to turn around layer by layer to the top of the base, as long as the height of the chimney is higher than the roof, you can basically ensure that the smoke exhaust of the chimney is normal. First, this kind of chimney is different from the round chimney with a thick bottom and a thin top, but it should be built in a square shape, and it should also be in the form of a step with a thick bottom and a thin top, and secondly, the chimney must usually be vertical, or as close to vertical as possible, to ensure the smooth flow of gases and draw in air into the so-called chimney combustion or chimney effect. Because the height of the chimney affects its ability to transport flue gas to the external environment through the chimney effect, the height of the chimney should generally be so high that it is not covered by the surrounding buildings, so as to ensure the smooth exhaust of the smoke; finally, and most critically, that is, the angle of the chimney bottom and the connection part of the pot stove, this part has a professional term in the mouth of the mason called "dog kennel". The opening direction and angle selection of the "dog kennel" determines whether the stove will reflect smoke, the choice of this angle has a certain degree of difficulty, the angle is too high or too low will lead to the flue is not smooth, therefore, this aspect is definitely a technical work, only those who have long-term practical experience of the old craftsman will accurately find the appropriate opening direction and angle. This kind of difficult technical work is such a big project, and the level of "two knives" like Chunshujia is definitely not good, and this kind of work must be done by Master Liu himself. What Chunshu can do is only the rough work of building bricks, not to mention, the chimney must be built higher than the roof must be scaffolded, like Master Liu's age and physique is really not suitable for high-altitude work, if Master Liu's old arms and legs are injured, it is a * annoyance, so this work can only be done by Chunshujia.

After the base of the chimney is coiled, it is Master Liu himself who personally works on the "dog kennel" of the connection between the bottom of the chimney and the pot stove, Master Liu holds two red bricks and compares the angle at a glance, and the spring calligrapher silently watches silently on the side, carefully pondering every action of Master Liu, and comprehending the meaning behind each action. Chun Shujia knows very well in his heart that whether it is a pot stove or a clay kang, the most critical point is to find the angle of the flue and the opening direction of the "dog kennel", the opening direction of the "dog kennel" and the angle of the flue can ensure that the pot stove is good to burn, and the opening direction of the "dog kennel" and the angle of the flue are not well found, then the pot stove will definitely burn back smoke. Chunshujia has also built a pot stove for the people in the village to hit the earthen kang, the opening direction of the "dog kennel" and the angle of the flue are really not easy to find, because of the lack of technical guidance, when the Chunshujia does these work, one relies on the Meng and the other is by trial and error, the luck of the Chunshujia is not bad, and the villagers have built a few pot stoves and hit a few earthen kangs, and there are really few anti-smoking phenomena. Despite this, Chunshu still failed to figure out what the trick was to find the direction of the opening of the "dog kennel" and the angle of the flue, and Chunshu hoped that this time he could be inspired by Master Liu.

After holding the two red bricks and making three or five strokes, Master Liu decisively shoveled a bunch of cement with a brick knife to fix the two red bricks, and then clapped his hands and said to ensure that the flue was unobstructed. Chunshujia's eyes widened and he couldn't understand how the direction of the opening of Master Liu's "kennel" and the angle of the flue were chosen, and he wanted to ask, right?

2.

In fact, it is not difficult to figure out the opening direction of the "kennel" and the selection of the flue angle, as long as you understand a natural problem and a physical problem.

Natural problems refer to the natural climate problems in the Toyama area. In winter, the north and northwest winds dominate the Toyama area, so if you want the stove not to smoke back, you need to let the flue avoid the direct blowing of the wind outlet, as long as the opening of the "dog kennel" is opened in the opposite direction of the wind direction.

Physical problems refer to problems of combustion and emissions. The normal mode of burning in the pot stove is to take in the air from the bottom and exhaust the smoke from the top, because the smoke is hotter and lighter than the air, so the smoke has to go up. However, in the early stage of combustion, the smoke is slightly hotter than the air, and its buoyancy is not enough to expel the air to rise, so it will naturally be discharged from the top of the lower air supply port (pot stove mouth), which is the so-called "anti-smoke". As for the angle of the flue, it is not a big problem, as long as the "kennel" at the junction of the stove and the flue is a gradual slope enough to direct the smoke into the chimney.

It's actually very easy to explain these questions, but it's really not easy to figure them out at once without anyone to guide you. For example, although Chunshujia is ingenious, a high school graduate, and has built a pot and a kang for others, Chunshujia has not raised his practical experience to the level of theory to analyze, so he has always been confused. As Stalin said, "A theory divorced from revolutionary practice is an empty theory, and a practice that is not guided by revolutionary theory is blind practice." Like this classic quote, this is a unified dialectical thinking. The Spring Scholar is just a farmer who digs food in the soil, where can there be such a height of thought?