Blast furnace gas dry method bag type dust removing mechanical type pressure dust unloading process and device thereof

Abstract

Disclosed is a blast furnace gas dry method bag type dust removing mechanical type pressure dust unloading process and device. A first gas pressure relief valve is arranged on a dust and gas chamber located on the lower portion of each cloth bag dust removing box body. Each first gas pressure relief valve of the corresponding cloth bag dust removing box body is connected to a concentration dust bin through a first gas pressure relief pipe, so that dust and gas with pressure in the concentration dust bin enter the dust and gas chambers located on the lower portions of the cloth bag dust removing box bodies through the first gas pressure relief valves. A second gas pressure relief valve is arranged on a gas purifying chamber located on the upper portion of each cloth bag dust removing box body. Each second gas pressure relief valve of the corresponding cloth bag dust removing box body is connected to a low pressure purified gas main pipe through a second gas pressure relief pipe, so that gas in gas purifying chambers located on the upper portions of the cloth bag dust removing box bodies enters the low pressure purified gas main pipe through the second gas pressure relief valves. Cloth bag dust removing box body dust unloading is conducted by utilizing gas pressure energy of a dust removing system. The blast furnace gas dry method bag type dust removing mechanical type pressure dust unloading process and device have the advantages that the mechanical dust unloading and conveying process is adopted and meanwhile pneumatic dust unloading and conveying are utilized, and the pneumatic dust unloading and conveying process is adopted and meanwhile mechanical power dust unloading and conveying are utilized.

Description

technical field [0001] The invention relates to the field of metallurgical blast furnace gas dry bag dust removal technology, in particular to a blast furnace gas dry bag dust removal mechanical pressure ash unloading process and a device thereof. Background technique [0002] Dry bag dust removal technology has been widely used in the purification treatment process of raw gas produced in the existing blast furnace smelting production process. Pneumatic ash conveying or mechanical ash conveying can be adopted, but there are the following deficiencies technically in practical application: [0003] 1. Adopt mechanical unloading and ash conveying process: the ash collected in the box ash bin is discharged by gravity and the vibration of the bin wall, the ash unloading speed is relatively slow and the efficiency is low; the box for ash unloading operation is in a state of temporarily stopping filtering gas , The ash unloading operation time is long, the filter production operat...

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Problems solved by technology

[0003] 1. Adopt mechanical unloading and ash conveying process: the ash collected in the box ash bin is discharged by gravity and the vibration of the bin wall, the ash unloading speed is relatively slow and the efficiency is low; the box for ash unloading operation is in a state of temporarily stopping filtering gas , the ash unloading operation time is long, the filter production operation rate of the box is reduced, which affects the increase of the bag load of the system box, the bag load changes frequently when the ash unloading operation is switched between the boxes, and the service life of the bag is reduced

[0004] 2. Pneumatic ash unloading and ash conveying process: the operation of ash unloading and ash conveying requires strict design parameters for the pressure, flow rate and gas-solid ratio of the conveyed gas, and the requirements for supporting testing and automation are high, and the investment cost is high; the operation process Auxiliary gas source is required, the process consumes a large amount of gas and energy consumption; in actual operation, since the ash discharge of a single box is an interval and short process, it is inevitable that the gas-solid ratio cannot reach a reasonable level in the early and late stages of ash discharge parameters, it will cause wear and tear of valves, pipe elbows and other equipment, or cause blockage of horizontal pipes and elbows in the ash conveying system

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