Method for expanding open-bore perlite by gas indirect heating
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An open-pore perlite, gas-fired technology, applied in the field of expansion furnaces, can solve the problems of high efficiency and short expansion stroke of beads
Inactive Publication Date: 2010-02-10
LUOYANG ANTUO KILN ENVIRONMENTAL PROTECTION
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[0006] In order to solve the above-mentioned problem that the existing open-cell and closed-cell expansion furnaces cannot expand perlite powder below 100-250 mesh, the present invention provides a method for indirect heating of perlite powder by gas-fired expansion, which can...
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Embodiment approach 1
[0034] Such as figure 1Shown in: a kind of gas type indirect heating open-pore perlite expansion method is to use gas indirect heating to heat open-pore perlite, especially suitable for expanding products with open-pore perlite powder below 100-250 mesh, when working, Firstly, the gas-fired indirect heating method is used to manufacture an indirect heating expansion furnace with a large top and a small bottom. The ambient temperature in the high temperature zone 5 of the expanded perlite in the body 4 reaches a high temperature of 1000-1150; conical cylinder.
[0035] Secondly: 1. Utilize the high-temperature flue gas of the combustion chamber 4 on the furnace to heat the air entering the gas burner, that is, exchange heat with the normal-temperature gas delivered by the fan through the heat exchanger at the high-temperature flue 6 outlet of the expansion furnace, and burn the incoming gas. The air in nozzle 2 is heated to over 200 degrees to solve the 2,600 cubic meters of ...
Embodiment approach 2
[0050] Such as figure 1 Shown in: a method of gas-fired indirect heating open-pore perlite expansion, it can also expand the perlite with large particles of 18-40 mesh, the expansion cylinder 3 can also be a conical shape with a small top and a large bottom Cylinder; the method of working is the same as that of the above-mentioned open-pore perlite expansion. When expanding the large-grained perlite, the separation method of the beads adopts an open type, and the switching valve at the blower end is closed, so that the large-grained perlite is separated by the blower through the air separator on the upper part of the discharge channel 9, and the materials of different sizes enter the grading closed-loop separation system. The silo is deposited, and some large-grained perlite is discharged through the end of the silo and collected by the pulse bag filter.
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Abstract
The invention discloses a method for expanding open-bore perlite by gas indirect heating, which heats the open-bore perlite in a gas indirect heating mode. The method comprises the following step: a. a gas indirect heating expansion furnace comprising an expansion cylinder (3) with a small upper cylinder and a big lower cylinder is used; b. the open-bore perlite expands in a high temperature area(5) of the small expansion cylinder in the furnace chamber, so that the perlite micropowder loses crystal water, quickly expands and increases the volume; c. the expanded perlite quickly enters in a low temperature area (8) in the big cylinder to gradually drop temperature without sticking to the wall; d. a draft fan absorbs high temperature waste gas in the furnace chamber through a high temperature flue (6), so that the temperature of the low temperature area in the big cylinder drops, and the form of the perlite is defined; and the discharge end uses a graded closed-loop separating system to ensure no pollution on the environment. The method solves the problem of difficulty in the expansion of the perlite micropowder with 100-250 meshes, has the advantages of short expansion range of balls, quick product discharge, high efficiency, no sticking to the furnace, and low equipment investment, and is suitable for the expansion and the separation of large granules and micro granules.
Description
technical field [0001] The invention relates to the technical field of expansion furnaces, in particular to a gas-fired indirect heating perlite expansion method. Background technique [0002] At present, perlite is an acidic volcanic glass lava, brittle in nature, with pearl luster and grease luster, special arc cracks, hardness 5.5-7, density 2.2-2.4g / cm3. The expansion multiple can reach more than 7 to 30 times, and the refractoriness is as high as 1300 to 1380 °C. After crushing, sieving, preheating and roasting, it becomes a porous granular material --- expanded perlite, which can be used with different cementing agents to make perlite products of various properties and properties, with light weight and thermal conductivity. Low performance, strong sound absorption, no corrosion, no combustion, acid and alkali resistance, non-toxic and tasteless, etc., are high-efficiency and ultra-light heat preservation, heat insulation, sound insulation, decorative materials, widely...
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