Converter dry-method primary dust removal method based on deep recovery of heat energy

Abstract

The invention discloses a converter dry-method primary dust removal method based on deep recovery of heat energy, and belongs to a converter energy conservation and emission reduction technology. Theconverter dry-method primary dust removal method based on the deep recovery of the heat energy is characterized in that the working system of an evaporative cooler is improved to make the temperatureof flue gas at an outlet of the evaporative cooler be increased to 700-900 DEG C, then a modern plate heat exchanger is adopted to recover the heat energy of the flue gas, the temperature of the fluegas is reduced to about 50 DEG C, meanwhile, a hot water resource with the temperature of about 90 DEG C is obtained, then a dry bag-type dust remover is adopted for fine dust removal, an electric dust remover with the explosion venting hidden danger is replaced, the dust content of the flue gas obtained after fine dust removal is smaller than or equal to 15 mg / m<3>, the temperature is about 50 DEG C, according to the heat energy recovery technical scheme, flue gas heat energy of 650-850 DEG C is recovered in total, the dual benefits of ultralow emission of the flue gas and deep recovery of the heat energy are achieved, the converter dry-method primary dust removal system in its true sense is realized, the dry-method dust removal type electric dust remover is eliminated, the explosion venting problem of potential production safety hazards is solved, and the converter dry-method primary dust removal method can be widely applied to various newly built, expanded or transformed converter primary dust removal systems.

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 ...

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Problems solved by technology

[0014] The gist of this invention is to use the new concept of energy saving and emission reduction, green circular economy, integration of industry and city, and sustainable development, starting from the recovery of primary flue gas heat energy from the converter, firstly improving the working system of the evaporative cooler, and on the one hand still completing the coarse dust removal On the other hand, reduce its heat loss, so that the flue gas temperature at the outlet of the evaporative cooler can be increased to 700-900 °C, and then the heat energy of the converter primary flue gas at the outlet of the evaporative cooler at about 700-900 °C is carried out by using a modern plate heat exchanger. Recycling, lowering its temperature to about 50°C, and obtaining hot water resources with a temperature of about 90°C at the same time, the hot water resources enter the public hot water pipe network and storage system for hot water users, and then use dry bag dust collectors Perform fine dust removal to replace the electrostatic precipitator with potential explosion hazards, and the dust content of the flue gas (coal gas) after fine dust removal is ≦15mg / m 3 , which can meet the requirements of ultra-low emission standards; the temperature of the primary flue gas (coal gas) of the converter after fine dust removal is about 50°C, and the converter gas that meets the recovery conditions is sent to the converter gas cabinet through the gas recovery switching valve, or it will not meet the recovery conditions The converter gas is ignited and released through the flue gas release chimney. This heat energy recovery technology scheme recovers the heat energy of the flue gas at 650-850°C in total, and receives the dual benefits of ultra-low emission of primary flue gas from the converter and deep recovery of heat energy, realizing the true meaning The primary flue gas purification system of the dry-process converter eliminates the electrostatic precipitator of the prior art dry-process dust removal, and solves the problem of explosion venting that has potential safety hazards in production

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