Glass kiln flue gas bypass desulfurization and denitrification system

Abstract

The invention relates to a glass kiln flue gas bypass desulfurization and denitrification system. The system comprises a glass kiln, a waste heat boiler and a chimney, wherein the waste heat boiler, adesulfurization tower, a dust remover and an induced draft fan are connected between a main flue of the glass kiln and the chimney, a bypass flue is arranged on the main flue in a communicating mode,a first flue gas cooler, a denitrification reactor and a second flue gas cooler are sequentially connected to the bypass flue, a flue which is cooled by the second flue gas cooler is connected to a flue gas inlet of the desulfurization tower, a first air blower and a second air blower are connected to the heat exchange air inlet ends of the first flue gas cooler and the second flue gas cooler correspondingly, and the heat exchange air outlet ends of the first flue gas cooler and the second flue gas cooler are connected to the chimney through pipelines in a communicating mode. The system has the advantages that during temporary maintenance of the glass kiln, the pollution index discharged flue gas is effectively reduced to meet the emission standard, in addition, the manufacturing cost islow, the temperature of flue gas can be effectively decreased to about 340 DEG C to enter the denitrification reactor, and further, the second flue gas cooler can enable the temperature of the flue gas subjected to denitrification to be decreased to 220 DEG C.

Description

technical field [0001] The invention relates to a glass furnace, in particular to a glass furnace flue gas bypass desulfurization and denitrification system. Background technique [0002] It is well known that the glass kiln waste heat boiler improves the utilization efficiency of flue gas, but the nitrogen oxides in the flue gas will have an adverse impact on the environment. Therefore, the SCR method is currently used to denitrify the flue gas. The flue gas required for denitrification The gas temperature is generally 330-380°C, and the flue gas temperature at the inlet of the glass kiln waste heat boiler is between 400-600°C. In order to meet the flue gas temperature required for out-of-stock, the newly designed waste heat boiler is led out after the first-stage evaporator. The flue gas that goes out of stock will return to the secondary evaporator. The higher the temperature of the flue gas that goes out of stock, the greater the loss to the waste heat boiler; during the...

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Problems solved by technology

[0002] It is well known that the glass kiln waste heat boiler improves the utilization efficiency of flue gas, but the nitrogen oxides in the flue gas will have an adverse impact on the environment. Therefore, the SCR method is currently used to denitrify the flue gas. The flue gas required for denitrification The gas temperature is generally 330-380°C, and the flue gas temperature at the inlet of the glass kiln waste heat boiler is between 400-600°C. In order to meet the flue gas temperature required for out-of-stock, the newly designed waste heat boiler is led out after the first-stage evaporator. The flue gas that goes out of stock will return to the secondary evaporator. The higher the temperature of the flue gas that goes out of stock, the greater the loss to the waste heat boiler; during the operation of the glass furnace, when a waste heat boiler fails and needs temporary maintenance , The furnace flue gas needs to be discharged after flue gas treatment. If the flue gas is not treated, it will cause serious pollution to the environment. The traditional glass kiln flue gas bypass system uses a spare waste heat boiler, and the investment of the spare waste heat boiler The cost is high, and the operation of the standby waste heat boiler is not stable. If it takes a long time, it may cause another shutdown; another commonly used flue gas bypass system for glass furnaces uses traditional tube heat exchangers. Large investment, large floor area, heavy weight, inconvenient transportation and movement, the carbon steel pipe used has a small heat transfer coefficient, easy to scale, easy to corrode, inconvenient cleaning and maintenance, and short service life

There are problems in the structure of the traditional low-temperature smoke cooler: 1. Corrosion: the temperature of the smoke drops below 90°C, which is lower than the acid dew point; 2. Ash accumulation: after the acid condensation, dust is absorbed and the blockage is serious; 3. Pressure drop: the fan capacity is limited, Resistance affects operation; 4. Installation space: bulky and difficult to implement

Cost-effectiveness of investment: big investment

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