Roller kiln energy-saving measures are very important. In terms of kiln energy-saving, I put forward my personal views and proceed the following aspects:
1. Energy-saving measures of kiln
1. Change the conventional thinking as a whole, the original high-temperature sintering, supplemented by oxidation preheating to preheating oxidation decomposition, and high temperature sintering as the auxiliary sintering design, focusing on solving the kiln of the oxidation zone The difference between the actual internal temperature and the actual temperature of the brick blank makes the brick blank quickly heated at this stage, and quickly reaches the oxidative decomposition temperature, so that the internal and external temperature of the brick blank is balanced. The brick blanks in the left, center and right positions in the kiln are in this area The temperature difference is smaller no temperature difference design, to solve the temperature difference of the kiln section to a greater extent.
1.1 Design enough heaters and burners in the oxidation area, basically design the encryption gun 8 burners per control group to 12 and shorten the length of each section of the kiln 2100mm Even longer is changed to 1870mm shorter.
1.2 The structure of the large-capacity radiation layer and the troposphere makes the brick body sufficiently heated in this area, and the gas radiation layer and the troposphere have enough thickness to supply the brick body with sufficient heat, so as to completely preheat the oxidation and allow the green body to burn and decompose completely , To obtain sufficient preheating, shorten the high-temperature firing temperature time and heating intensity, reduce the heat dissipation of the kiln wall to achieve energy saving effect. Previously, many of our kiln companies knew that the higher the inner cavity of the kiln, the better the product operation, so we increased the inner cavity of the entire high box kiln body more than 300 mm to more than 500 mm.
1.3 According to the convection heat transfer rules, effectively reduce the space height of the oxidative drying area, break the conventional design of smoke exhaust pipes in a row, adopt a staggered cross design to allow uniform airflow to heat the blank, and design a reasonable space height to fully heat the blank The heat exchange between the green body and the flue gas in this area is fully replaced and preheated, quickly dried, and the structural water is completely eliminated, laying a foundation for oxidative decomposition and reducing the pressure of oxidative decomposition. Reduce the sensible heat taken away by smoke exhaust.
2. For the recycling of kiln waste heat, we use the direct extraction of the quenching air in the kiln and then heat it through the spr device to heat the combustion air to 250 ℃-350 ℃, make full use of the kiln waste heat air, reduce energy consumption. Reduce the positive pressure of the kiln, reduce the heat leakage caused by the excessive positive pressure of the kiln, and reduce the energy consumed by the heat dissipation of the refractory material of the kiln to reduce the energy consumption.
3. In the thermal insulation material, we use low thermal conductivity, high density and lightweight thermal insulation materials to effectively prevent the heat being emitted the top of the kiln wall. Especially on the top, we use hollow panels and high-density light-weight structural devices. On the wall of the stick, we use a special structure similar to hollow materials to effectively reduce the heat dissipation and achieve energy-saving effects.
4. The spray gun is designed to increase the molecular activity of fuel and combustion air according to the principle of energy conservation. It adopts the design concept of full contact, high efficiency, and oxygen-enriched combustion. Fully contact and quickly burn to play a greater thermal efficiency, instantaneously release energy to produce a larger calorific value, improve thermal efficiency, and reduce the loss of thermal efficiency caused by various incomplete combustion and premature combustion. To achieve the purpose of energy saving.
5. The spray gun layout also distinguishes different areas with different power spray guns and different outlets, which effectively solves the temperature difference of the kiln section, eliminates the left-middle-right temperature difference existing in the kiln in the wide section, and the blank and the kiln The temperature difference of the actual flue gas of the furnace. In order to improve the uniformity and speed of the brick body inside the kiln, effectively shorten the firing cycle of the kiln and reduce the high temperature of the kiln, for example, we use high heat, high power, and different calibers in the oxidation area Silicon burner sleeves burner bricks make full use of the expansion and contraction limits of the brick body to greatly heat the brick body, so that the brick body is completely heated even overfired in this area, thereby reducing the firing temperature in the high temperature area.
6. The layout of the spray gun breaks the layout setting of the same height the center of the stick to the center of the spray gun, and the design height of the bottom is different, so that the heat of the burner can fully play a higher value.
7. Effectively use the tail gas inside the kiln as a medium to enhance the combustion efficiency of the kiln, reduce energy consumption and exhaust gas emissions, accelerate the mixing speed of fuel and air, and reduce fuel consumption.
The basis of the second design reference
Part of the exhaust gas (generally referred to as nitrogen oxides) extracted the exhaust of the kiln quenching is used as an oxidizing mediator, thereby increasing the oxidation rate, accelerating the reaction, allowing the fuel to achieve efficient combustion, thereby enriching the combustion of oxygen, and improving Calorific value.
Three conclusions
There are many directions in which kiln energy-saving technology can be promoted, including kiln structure design and commissioning, piping system design, equipment selection, combustion system, and development and application of energy-saving spray guns. Under the dual role of policy and market, domestic kiln enterprises began to innovate continuously in the field of energy saving and emission reduction.
