Process Selection and Scheme Design for Comprehensive Treatment of Glass Furnace Flue Gas

This process is suitable for glass kiln with natural gas or coal gas as fuel, and for kiln with waste heat for power generation. Because of the high temperature dust removal, dust and NO 2 can be reduced simultaneously. The system covers a large area and is difficult to reconstruct the old line. The temperature drop of the system is generally less than 20 C.

3.2 Waste Heat Boiler+Temperature Regulating Tower+High Temperature Electrostatic Precipitation+SCR

The flue gas from the exit of flue gas of glass kiln is firstly treated by conditioning and cooling tower, then is treated by cooling and conditioning (pre-desulfurization). The flue gas enters the high temperature dedusting, then enters the SCR denitrification reactor, completes the dedusting, denitrification and desulfurization treatment according to the requirements synchronously, and the flue gas returns to the low temperature section of waste heat boiler to continue the waste heat utilization. The process drawings are as follows:

The process is suitable for glass kilns fueled by heavy oil and petroleum coke, and equipped with waste heat power generation boilers. The flue gas conditioning tower installed in front of the dust collector is the key to increase the dust removal effect. When the conditioning tower is used as the pre-desulfurization treatment, the temperature drop will reach 30 C. However, due to the implementation of clean energy transformation in the glass industry, the kilns fueled by heavy oil and petroleum coke were gradually replaced by natural gas.

3.3 desulfurization and conditioning + high temperature dust removal + SCR denitrification + heating waste heat boiler

The flue gas from the exit of glass kiln flue gas is firstly treated by desulfurization and conditioning tower. After cooling and desulfurization treatment, the temperature of flue gas is controlled at 320-380 C. Then it enters high temperature dust collector, SCR reactor and heating waste heat boiler. The temperature of imported flue gas of waste heat boiler is guaranteed to be higher than 300 C through pre-temperature control. According to the technological requirements, bypass flue is set before the waste heat boiler to achieve desulfurization, dust removal and denitrification simultaneously. The process drawings are as follows:

This process is suitable for glass kilns with relatively small output, such as boilers below 300 t/d, without waste heat power generation. This kind of glass kiln, because of its small output and early construction time, is mostly calendering and special glass production lines, which need to deal with less air volume (less than 60,000 Nm3/h). Through on-site optimization, overhead and other ways, it is easier to realize the layout of new equipment.

3.4 Cooling+High Dust SCR+Heating Boiler+Wet Dedusting/Desulfurization/Semi-dry Desulfurization System

The flue gas from the main flue of glass kiln is first treated by cooling (spraying water). The temperature of the flue gas is controlled at about 350 C. Then it passes through a high-dust SCR denitrification reactor. After the waste heat is utilized, the dust in the flue gas is washed by wet dedusting. After having the preliminary desulfurization effect, the flue gas enters the wet desulfurization process. The related equipment of wet dedusting and desulfurization process is shared. When semi-dry desulfurization system is used, it will be more conducive to dust treatment. The process flow chart is as follows:

The process is suitable for small kilns with sufficient water resources (output below 250t/d) or production lines with wet desulfurization system, which use coal to produce gas and natural gas as fuel, and waste heat is not used for power generation. According to experience, the pore size of catalyst should be greater than 7 mm, and the flow rate in the pore should be greater than 7 m/s. When wet dust removal and desulfurization are adopted, a unified plan for slurry treatment should be made.