Efficient purifying method for exhausted tail gases from firing of gangue baked bricks in portable tunnel kiln
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A technology of coal gangue and tunnel kiln, which is applied in the field of high-efficiency purification of gas, can solve the problems that tail gas cannot be purified, and achieve the effects of saving purification costs, saving energy, and high desulfurization efficiency
Inactive Publication Date: 2015-07-15
HEBEI DINGLEI BUILDING MATERIAL CO LTD
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[0006] The technical problem to be solved in the present invention is to provide a highly efficient purification method for the tail gas emitted by firing coal gangue and sintered bricks in a mobile tunnel kiln, which can solve the problem that the tail gas of the existing mobile tunnel kiln cannot be purified with relatively low cost input and relatively simple process steps. The problem
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Embodiment 1
[0035] Preparation of coal gangue standard brick adobe. Coal gangue, fly ash, soft shale, and garbage soil are the main raw materials, fed according to the following weight percentages: 70% coal gangue, 5% fly ash, 20% soft shale, 5% garbage soil, and crushed by a crusher 1. Add water to the mixer and send it to the aging warehouse for aging treatment. After fully aging, add water to the mixing extruder to stir, extrude and grind, and then enter the vacuum brick extruder for extrusion molding, and the prepared size is 240mm×115mm× 53mm standard brick adobe. After testing, the calorific value of coal gangue standard brick adobe is 1330kJ / kg.
Embodiment 2
[0037] Preparation of coal gangue porous brick adobe. Coal gangue, fly ash, soft shale, and garbage soil are the main raw materials, fed according to the following weight percentages: 75% coal gangue, 5% fly ash, 15% soft shale, 5% garbage soil, and crushed by a crusher 1. Add water to the mixer and send it to the aging warehouse for aging treatment. After fully aging, add water to the mixing extruder to stir, extrude and grind, and then enter the vacuum brick extruder for extrusion molding, and the prepared size is 240mm×115mm× 90mm porous brick adobe, the porosity of the porous brick adobe is ≥25%. After testing, the calorific value of gangue porous brick adobe is 1380kJ / kg.
Embodiment 3
[0039] Preparation of coal gangue hollow block adobe. Coal gangue, fly ash, soft shale, and garbage soil are the main raw materials, fed according to the following weight percentages: 80% coal gangue, 5% fly ash, 10% soft shale, 5% garbage soil, and crushed by a crusher 1. Add water to the mixer and send it to the aging warehouse for aging treatment. After fully aging, add water to the mixing extruder to stir, extrude and grind, and then enter the vacuum brick extruder for extrusion molding, and the prepared size is 240mm×115mm× 190mm hollow block adobe, the porosity of the hollow block adobe is ≥40%. After testing, the calorific value of gangue hollow block adobe is 1460kJ / kg.
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Abstract
The invention discloses an efficient purifying method for exhausted tail gases from firing of gangue baked bricks in a portable tunnel kiln. The efficient purifying method comprises the following process steps of stacking raw materials: stacking green gangue bricks and limestone in an annular kiln bottom between annular tracks of the portable tunnel kiln; roasting the green gangue bricks and the limestone in the kiln to desulfurize: roasting the green gangue bricks and the limestone in an arc kiln body according to a certain temperature raising procedure, and performing primary desulfurization by high-temperature roasting; performing wet flue gas desulfurization: feeding the calcined limestone into a desulfurizing liquid adjusting pool, and adjusting the basic strength in the adjusting pool; introducing tail gases in the kiln body into a desulfurizing tower, sprinkling the desulfurizing liquid in the desulfurizing liquid adjusting pool into the desulfurizing tower, and performing secondary desulfurization by a chemical reaction generated in the desulfurizing tower. According to the efficient purifying method disclosed the invention, by the adoption of a combined desulfurization method of desulfurization by roasting in the kiln and the wet flue gas desulfurization, the problems of desulfurization and purification of the tail gases in the portable tunnel kiln are successfully solved; meanwhile, energy sources can be saved, and the purification cost is reduced.
Description
technical field [0001] The invention relates to a high-efficiency purification method of gas, in particular to a method for desulfurization and purification of tail gas discharged from burning coal gangue sintered bricks in a mobile tunnel kiln. Background technique [0002] The mobile tunnel kiln is a sintered brick process system designed with a reverse thinking method in which the adobes do not move and the kiln body moves. The arc-shaped kiln body of the mobile tunnel kiln runs on two corresponding circular tracks. In the circular kiln bottom between the circular tracks in front of the arc-shaped kiln body, the arc-shaped kiln body moves forward to bring the bricks into the arc-shaped kiln body, and the arc-shaped kiln body is provided with a drying section and a preheating section in sequence from front to back , roasting section, heat preservation section, and cooling section. When the kiln body moves forward, the bricks taken in from the front door of the kiln will co...
Claims
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