Gas phase impulse back-flushing internal filtering type bag dust collector for blast furnace gas

Abstract

The invention discloses a gas phase impulse back-flushing internal filtering type bag dust collector for blast furnace gas, which has excellent and relatively uniform dust collecting effect for filter bags. The bag dust collector is mainly characterized in that an airflow reflection arc surface facing towards a filter unit is arranged above the filter unit; and the bag dust collector further comprises a purified coal gas back-flushing port which is communicated with a nozzle facing towards the airflow reflection arc surface in a coal gas purifying space by a pipeline. The back-flushing airflow is not directly blown to the filter bags, but is blown to the various filter bags after blown towards the airflow reflection arc surface by the nozzle firstly and reflected by the airflow reflection arc surface, therefore, the back-flushing airflow is uniformly distributed in annular sections arranged by the filter bags and bears balanced pressure, so as to become a key structure for impulse dust collection for the filter bags; and in addition, the back-flushing airflow can exchange heat with gas in the filter unit to homogenize the temperature while being introduced through the coal gas purifying pipeline, so as to reduce the temperature difference and reduce the probability of occurrence of moisture condensation, and finally the best and uniform dust collection effect is achieved. The dust collector provided by the invention is low in cost and reliable in operation.

Description

technical field [0001] The invention relates to a dust remover, in particular to a blast furnace gas gas phase pulsation back blowing inner filter bag type dust removal device. Background technique [0002] Blast furnace gas full-dry bag dust removal technology for iron and steel enterprises has been widely used in China due to the large domestic crude steel production capacity and the country's consideration of energy conservation and environmental protection. Special provisions have been made in industry standards and regulations. Influenced by environmental protection and technology in foreign developed countries, the application of full-dry bag filter is subject to certain restrictions. The blast furnace gas pulse bag filter, which is widely used in China, evolved from the environmental dust collector. It uses high-pressure nitrogen as the driving force for cleaning dust. The pulse valve is used to control the instantaneous release of nitrogen gas, which is injected into...

AI Technical Summary

Problems solved by technology

Influenced by environmental protection and technology in foreign developed countries, the application of full-dry bag filter is subject to certain restrictions

The blast furnace gas pulse bag filter, which is widely used in China, evolved from the environmental dust collector. It uses high-pressure nitrogen as the driving force for cleaning dust. The pulse valve is used to control the instantaneous release of nitrogen gas, which is injected into the filter bag at high speed, causing the filter bag to expand rapidly. , relying on impact energy and back blowing airflow to clean dust, mainly composed of nitrogen pulse control system, filter bag cylinder, flower plate, outer filter bag, bag cage, etc., the filter bag is fixed on the flower plate by a snap ring, and Complete the isolation between the clean gas chamber and the coarse gas chamber. Since the filter bag will inevitably vibrate during pulse cleaning, there will be gaps in the seal between the filter bag mouth and the flower plate for a long time, and dust leakage will inevitably occur at the bag mouth. , only one end of the filter bag is fixed. When using pulse compressed gas to clean dust, only the filter bag itself expands and swings to clean the dust. Due to the limited elasticity of the filter bag itself, pulse cleaning with low power will cause the filter bag to deform. Limited, the cleaning effect is not good; when the power is high, the cleaning intensity is high, but at the same time it causes great damage to the filter bag, causing problems such as high leakage level and low filtration accuracy in practical applications. The equipment of the matching process has a greater impact

[0003] In order to optimize the dust removal technology of pulse bag filter, gas phase pulse bag filter and rotary pulse bag filter came into being, but the effect is not good when applied to blast furnace gas dust removal, and the problem has not been fundamentally solved

Some domestic steel mills try to apply the reverse blowing inner filter bag filter to blast furnace gas dust removal. Although the performance of the filter bag is better than that of the pulse bag filter in terms of dust removal strength, filter bag life, and supporting equipment reliability, but There is still a gap between the TRT system and the post-process requirements for blast furnace gas dust removal accuracy and stability

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