Converter semidry method primary dedusting method based on thermal energy deep recovery

Abstract

A converter semidry method primary dedusting method based on thermal energy deep recovery belongs to a converter energy conservation and emission reduction technology, key points are improving workingsystems of an evaporative cooler, improving outlet flue gas temperature of the evaporative cooler to 700-900 DEG C, consequently using a modern plate type heat exchanger to recover flue gas thermal energy, performing cooling to about 50 DEG C, meanwhile, obtaining a hot water resource of which the temperature is about 90 DEG C, further performing fine dedusting through a dry bag-type dust collector, and replacing a wet system of a spray tower, a fine dedusting adjustable throat venturi and a dewatering cooler, wherein the dust content of flue gas subjected to fine dedusting is less than or equal to 15mg / m<3>, and the temperature is about 50 DEG C. A thermal energy recovery technical scheme provided by the invention totally recovers 650-850 DEG C flue gas thermal energy, receives multiplebenefits of converter primary flue gas thermal energy deep recovery, ultralow emission, saving of plenty of water and saving of plenty of energy, realizes a converter dry method primary dedusting technology in real meaning, and can be widely used in various converter primary dedusting systems newly built, expanded or transformed.

Description

technical field

[0001] The invention belongs to the energy-saving and emission-reduction technology of converters.

[0002] The present invention does not involve the manufacturing technology of various plate heat exchangers, does not involve the manufacturing technology of various dust collectors, does not involve the utilization technology of heat energy and its specific technical solutions. Background technique

[0003] The temperature of the flue gas produced in the converter smelting process is about 1450-1600°C. The existing technology adopts the method of vaporization cooling flue (boiler) to cool it to the flue gas of 800-1050°C, and then performs flue gas purification and gas recovery. During vaporization cooling and cooling, the steam generated during the cooling process is collected and sent to the public steam pipe network for use by steam users inside the steel plant. The vaporization cooling process recovers the heat energy of the flue gas at a temperature of ...

Examples

Embodiment Construction

[0016] At present, there are problems in the primary dedusting system of the converter semi-dry method. First, there is a serious waste of flue gas heat energy. Second, the dust removal index is still difficult to meet the requirements of ultra-low emissions. Third, fine dust removal is still a wet technology, which has large system resistance and water consumption. and the problem of high power consumption.

[0017] The existing technology partially recovers the heat energy of the primary flue gas produced in the converter smelting process, and uses the vaporization cooling flue to cool the flue gas at a temperature of 1450-1600°C to 800-1050°C, and recovers the flue gas at about 650-800°C Heat energy, the amount of recovered heat energy is less than 50%, and the remaining flue gas heat energy is lost in vain. The remaining heat energy is huge, if it can be recycled, it will produce good social and economic benefits.

[0018] For a long time, due to the lack of systematic an...

technical field

[0001] The invention belongs to the energy-saving and emission-reduction technology of converters.

[0002] The present invention does not involve the manufacturing technology of various plate heat exchangers, does not involve the manufacturing technology of various dust collectors, does not involve the utilization technology of heat energy and its specific technical solutions. Background technique

[0003] The temperature of the flue gas produced in the converter smelting process is about 1450-1600°C. The existing technology adopts the method of vaporization cooling flue (boiler) to cool it to the flue gas of 800-1050°C, and then performs flue gas purification and gas recovery. During vaporization cooling and cooling, the steam generated during the cooling process is collected and sent to the public steam pipe network for use by steam users inside the steel plant. The vaporization cooling process recovers the heat energy of the flue gas at a temperature of ...

Examples

Embodiment Construction

[0016] At present, there are problems in the primary dedusting system of the converter semi-dry method. First, there is a serious waste of flue gas heat energy. Second, the dust removal index is still difficult to meet the requirements of ultra-low emissions. Third, fine dust removal is still a wet technology, which has large system resistance and water consumption. and the problem of high power consumption.

[0017] The existing technology partially recovers the heat energy of the primary flue gas produced in the converter smelting process, and uses the vaporization cooling flue to cool the flue gas at a temperature of 1450-1600°C to 800-1050°C, and recovers the flue gas at about 650-800°C Heat energy, the amount of recovered heat energy is less than 50%, and the remaining flue gas heat energy is lost in vain. The remaining heat energy is huge, if it can be recycled, it will produce good social and economic benefits.

[0018] For a long time, due to the lack of systematic an...

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