High-temperature air and high-temperature low-oxygen smoke mixed combustion-supporting type full-automatic control ceramic kiln

Abstract

The invention discloses a high-temperature air and high-temperature low-oxygen smoke mixed combustion-supporting type full-automatic control ceramic kiln which comprises a combustion-supporting gas main pipe, a fuel gas main pipe and a kiln body. The kiln body is divided into a cooling section, a combustion section and a preheating section in the longitudinal direction. The combustion section comprises at least three control subareas, and each control subarea comprises a thermocouple, at least five nozzles and a control box. Each control box is provided with a box body, a first mixer contained in the box body, a combustion-supporting gas control branch pipe penetrating one side wall of the box body to be connected between the first mixer and the combustion-supporting gas main pipe, a fuel gas control branch pipe penetrating the other side wall of the box body to be connected between the first mixer and the fuel gas main pipe, and a mixed gas branch pipe penetrating one end wall of the box body from the first mixer to extend to the outside of the box body. First electric valves, first thermometers and first flowmeters are arranged on the combustion-supporting gas control branch pipes. Second electric valves and second flowmeters are arranged on the fuel gas control branch pipes. Each mixed gas branch pipe is connected with the at least five nozzles in the corresponding subarea.

Description

technical field [0001] The invention relates to a ceramic kiln, in particular to a fully automatic control ceramic kiln. Background technique [0002] At present, as the market demand for ceramics is increasing, ceramic kilns are being built longer and wider, and their cross-sections are becoming wider and wider. Firing defects such as deformation and color difference are also becoming more and more serious. In addition, ceramic kilns often use gas as a heat source. Whether the ratio of gas and supporting gas is reasonable during combustion directly affects the energy consumption. When the amount of supporting gas is too small, the combustion is incomplete, and the incomplete combustion products contain a large amount of substances that pollute the environment, which also causes a waste of energy; and when the amount of supporting gas is too large, the excess air and supporting gas will take away a lot of heat when it is discharged, increasing the energy consumption. Great...

AI Technical Summary

Problems solved by technology

However, the combustion-supporting air and natural gas linear proportional control system applied to ceramic kilns has the following shortcomings or deficiencies: (1), only use the pipe diameters that are provided with the mixed air pipeline and the natural gas pipeline to have different sizes to control the mixed air and natural gas When the temperature changes, it is difficult to accurately achieve the best air-fuel ratio of mixed air and natural gas; (2), using a pressure regulating valve to control the pressure of mixed air and natural gas to control the uniform temperature in the kiln, the control effect Poor, the effect of conversion between pressure and temperature is not obvious, and the reaction speed is slow

However, the energy-saving device on the ceramic kiln that can adjust the oxygen content of the hot gas in sections has the following shortcomings or deficiencies: (1), it can only automatically adjust the amount of combustion-supporting air, and cannot adjust the amount of gas at the same time, so that the gas and The air reaches the best air-fuel ratio; (2), the amount of combustion-supporting air is automatically adjusted by monitoring the oxygen content of the air, and the system cannot be automatically adjusted when the temperature of the combustion-supporting air decreases; (3), the adjustment of the combustion-supporting air volume and the amount of gas The adjustment cannot be synchronized or follow-up, which may cause cold air to blow into the kiln, affecting the combustion efficiency and even affecting the quality of ceramic products

However, the segmented ceramic kiln gas and air linkage control system has the following disadvantages or deficiencies: (1), only the hot air after heat exchange can be used alone as the supporting gas, and the gas discharged from the ceramic kiln is not fully utilized. A large amount of high-temperature and low-oxygen flue gas is used as an auxiliary combustion gas; (2), the first thermocouple can only measure the air temperature data in the air main pipe, but cannot measure the air temperature data in each air branch pipe that has a temperature difference with the air main pipe, There are errors when adjusting the air-fuel ratio; (3), it is necessary to arrange a large number of air input pipes and gas input pipes on the kiln body, which is cumbersome to assemble and complex in structure

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