High-temperature reducing protective gas circulation drying system and method

Abstract

The invention relates to a high-temperature reducing protective gas circulation drying system and method, comprising: feeding the reducing protective gas at the inlet section of the strip steel into the hot coke layer through a high-temperature fan; Fully react in the layer to generate carbon monoxide or carbon dioxide and hydrogen, and reduce the moisture content in the reducing protective gas to reduce the dew point value to meet the repeated use conditions, and then enter the gas purification device for dust removal and purification; the fully dried and purified reduced The protective gas is sent to the detection station to detect the concentration of H2, CO and CO2; and the reducing protective gas with a controlled ratio is re-entered into the reduction section of the annealing furnace through the booster pump to reduce the strip. In the continuous heat treatment production process of strip steel, the reducing protective gas can be directly recycled and used without cooling and heating, which reduces the process and energy consumption without changing the reducing nature of the reducing protective gas.

Description

technical field [0001] The invention relates to a method for recycling industrial reducing protective gas, in particular to a circulating drying system and method for high-temperature reducing protective gas. Background technique [0002] With the continuous expansion of the application range of cold-rolled and hot-dip galvanized products, the quality requirements of various industries are getting higher and higher. In the continuous production process of cold-rolled strip steel, the composition of the reducing protective gas plays a decisive role in product quality; the composition range of the reducing protective gas, that is, its safety and reliability are directly related to the normal operation of the continuous strip steel production line, and the reducing The composition and purity quality of the shielding gas directly affect the surface quality of the strip product. The so-called reducing protective gas mainly refers to the reducing gas or neutral gas that protects ...

AI Technical Summary

Problems solved by technology

Condensation dehydration is used when there is a lot of moisture in the gas or the water content is much higher than the saturation concentration at room temperature. Most of the moisture in the reducing protective gas is removed by condensation, and its drying capacity is limited by the vaporization temperature of the refrigerant; for For high-temperature reducing protective gas, because the condensation dehydration method needs to cool the high-temperature gas, it needs to be heated to the original temperature after drying, which will inevitably cause a huge waste of energy

Deep drying gas is generally dehydrated by desiccant. Commonly used desiccants include silica gel, activated alumina, molecular sieve, etc. Generally, the gas can be dried to a dew point below -40°C. However, the common disadvantage of this method is that the operating temperature is low. Below 150°C, compared with the commonly used annealing temperature of 800°C for cold-rolled strip steel, there is still a large temperature difference, resulting in a large waste of energy consumption.

Images