Causes of black smoke from tunnel fan
Dry medium - waste heat of finished bricks in oven. The drying medium is sent to the drying chamber by a blower, and the heat is transferred to the surface of the billet by heat exchange. When the blank surface is heated, the heat is transferred to the blank interior. Diffusion and conduction are heat transfer processes. When the blank surface is heated, the surface moisture evaporates. Due to the moisture difference in the material, the moisture inside the blank moves to the surface and then evaporates from the surface to the blank dries, which is a heat transfer process. The heat source of tunnel drying chamber, that is, the heat energy used for drying, is usually the hot air formed by the waste heat of tunnel kiln brick, which is usually called the waste heat of furnace.
The cause of black smoke from the exhaust pipe.
With the implementation of the Draft implementation Guide for Brick enterprises, the Emission Standard for Air Pollutants in brick Factory industry (GB296202013) and the Emission Standard for Air pollutants in brick product industry (GB296202013) began to be actively managed and changed. During the operation, gas and heat are separated. Complete separation of flue gas from heat means that the furnace flue gas enters directly into the flue gas treatment equipment. Waste heat in the kiln is used directly for drying blank. The principle is the waste heat energy of kiln tail bricks. Radiation, heating the surrounding air to form waste heat. (no waste heat) air, no flue gas treatment equipment, dry directly after drying; The flue gas pollutants in the kiln have small air volume, high temperature and low humidity, and large emissions. Equipment should be treated before reaching standard emissions.
In brick and tile enterprises, the exhaust pipes that usually discharge water more or less emit black smoke (blue smoke) that does not meet the emission standards. The reason is that in tropical areas, the carbon consumed by bricks is less, the carbon in the calcined area does not burn, or the heat value of the billet is very high and the kiln speed is very fast, so the carbon left in the billet is more, resulting in the carbon left in the billet. The bricks in the cooling area are still burning, which inevitably produces harmful substances such as carbon monoxide, carbon dioxide, soot and sulphide.
These are mixed with water vapor in the drying chamber. When the concentration reaches a certain level, smoke particles visible to an adult's eye are collected during emission and form a continuous black smoke.