A Muffle Furnace Used for Determination of Ash Content in Coal Samples

Abstract

The invention discloses a muffle furnace used for coal sample ash determination. The problem that in the prior art, the advance speed of coal samples is uneven so that the detonation probability is high is solved. The technical scheme is characterized in that the muffle furnace used for coal sample ash determination comprises a furnace body; the furnace body is provided with a hearth and a heaterarranged inside the hearth; the furnace body is provided with a furnace door and a chimney communicating with the hearth; the furnace body is further provided with a conveying mechanism and a heat-resistant plate arranged on the conveying mechanism inside the hearth; heat-resistant ash vessels are arranged on the hear-resistant plate; the conveying mechanism comprises guide rails symmetrically installed on the two inner walls of the hearth, a sliding support slidably installed on the two guide rails, a rack fixed to one side of the top face of the sliding support, a gear matched with the rack,and a servo motor used for driving the gear to rotate; and the rack is arranged in the depth direction of the hearth. By means of the muffle furnace, the detonation probability of the coal samples inthe ash vessels can be decreased.

Description

technical field [0001] The invention relates to the field of coal sample detection, in particular to a muffle furnace for coal sample ash determination. Background technique [0002] At present, there are mainly two methods for determining the ash content in coal, namely the slow ashing method and the fast ashing method. Compared with the slow ashing method, the fast ashing method is a coal sample ash detection method with a higher detection speed. [0003] The steps of the rapid ashing method are as follows: 1. Spread the coal sample in an ash dish so that the mass per square centimeter does not exceed 0.15 g, and arrange the ash dish containing the coal sample on a heat-resistant porcelain plate in advance; 2. Heat the muffle furnace to 850°C, and slowly push the inner heating porcelain plate with the gray dishes into the muffle furnace, so that the gray dishes react in batches according to the number of rows. [0004] At present, the experimenters generally push the hea...

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Problems solved by technology

[0004] At present, the experimenters generally push the heat-resistant porcelain plate into the muffle furnace manually, but because the speed of manual pushing is not constant enough, it is easy to cause deflagration of the coal sample with high volatile content in the ash dish, resulting in the test data not being used , so at this stage, it is necessary to develop a muffle furnace that can control the heat-resistant porcelain plate to enter the furnace cavity of the muffle furnace at a uniform speed

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