SU874618A1 - Method of cooling coal layer - Google Patents

Description

This invention relates to a process for producing charcoal and carbon products based on it and can be used in the chemical industry. A known method of cooling the carbon layer with non-condensing aeons til. The disadvantage of this method is the length of the cooling process and the ability of the cooled coal to ignite spontaneously. The closest to the proposed technical essence and the achieved result is the way of the layer of coal 140 mm in height from 70 to 40 With air f2. However, with this method of cooling a layer of coal, it is not necessary to preliminarily cool it to 70 ° C with non-condensing gases, which requires an additional time and does not exclude the possibility of self-ignition of carbon ... The purpose of the invention is to intensify the cooling process and stabilize it. coal The goal is achieved by the method that the coal layer at the initial temperature of 105500 ° C is cooled with air, while at the same time where is the angle of the coal in the layer where the layer to be cooled defines this formula. h 48305863.5 (} h is the height of the cooled carbon layer J coefficient determined by the final pyrolysis temperature, the initial cooling temperature of the coal. The maximum initial temperature of the minimum cooled layer is determined by the temperature of the pyro formula 0 5-Ц-Н157.9, (2). pyrolysis temperature. A distinctive feature of the method is that cooling is carried out at the normal temperature of 105-500 s in e, the height of which is determined by the formula h 48305863, h is the height of the cooled coal layer; к is a coefficient determined by the final temperature of the pyrolysis; coal cooling. The maximum initial temperature of the minimum layer of cooled coal is determined by the pyrolysis temperature according to the formula: 0.35t + 157.9, where t is the pyrolysis temperature. The method of cooling the carbon layer by air is as follows. ), based on the pyrolysis temperature, determine the maximum initial temperature of the minimum layer (10 mm) of the cooled coal. If the actual temperature of the coal is below the maximum, then determine the height of the layer by the formula (1). If the actual temperature of the coal is higher than the maximum, then the coal is first cooled by known methods to the temperature below the maximum and the layer height is determined using formula (1). The coefficient k in the formula (1) depends on the temperature of the pyrolysis of coal and has the following meanings: O 5, 0.7; Kj. i i; Kboo 1.05; K-, oo 1,2; K 1 1.6; K Depending on the initial parameters, the cooling process lasts 130 min. In tab. 1 shows the experimental data on the basis of which the formula (2) was obtained. In tab. Figure 2 shows the experimental data, on the basis of which formula (1) was obtained, the pyrolysis temperature is 550 C. Example 1. Birch wood, in the form of pieces 50x50x50 m in size, is pyrolyzed in a vertical continuous retort at the final temperature. The resulting charcoal is cooled in the retort quenching section with inert gases to (below the maximum for the selected conditions of cooling the coal with air), unloaded onto a belt conveyor with a layer of 60 mm and cooled to 40 s by direct contact with ambient air having a temperature of 20 ° C. The cooling time of coal on the conveyor is 3.5 minutes. Ox / gated coal does not have the ability to ignite spontaneously. Example 2. Birch wood in the form of technological chips is pyrolyzed in a vertical continuously operating retort at a final temperature of 600 ° C. The resulting charcoal is cooled in Example 1 prior to and unloaded onto a belt conveyor with a layer of 20 mm and cooled to 40 ° C by direct contact with the surrounding air. The cooling time on the conveyor is 1.5 minutes. Chilled coal does not have the ability to ignite spontaneously. Example 3. Charcoal with a particle size of 1-5 mm is activated in a rotating cylindrical furnace at. Received activated and coal is cooled in a coil cooler in an inert atmosphere to a temperature of 500 ° C, and then unloaded onto a belt conveyor with a layer of 10 mm and cooled with air at a temperature of 20 s. The duration of coal cooling by air on the conveyor is 2.5 minutes. Chilled coal does not have the ability to ignite spontaneously. EXAMPLE 4 Charcoal obtained in Example 1 is cooled in the retorting part of the retort with inert gases to a temperature of 100 ° C, unloaded onto a belt conveyor with a layer of 200 mm and cooled to 40 ° C with air with a temperature of 20 C. Duration of cooling Air coal on the Transporter 30 min. Chilled coal does not have the ability to ignite spontaneously. Thus, the proposed method for cooling a layer of coal makes it possible to intensify the process of cooling the coal and to avoid its spontaneous combustion. Table 1.

Maximum initial temperature of the minimum layer (10 mm) of cooled coal t, ° С

510

470

440

400

Claims (2)

Table 1. Claim 1, a method for cooling a coal layer with air, characterized in that, in order to intensify the process and stabilize the coal, cooling is carried out at an initial temperature of SW-ZOO c in a layer whose height is determined by the formula 1 5-74 h 48305863 , 5 kt where h is the height of the cooled coal bed; k is the coefficient determined by the final temperature of the pyrolysis; t is the initial cooling temperature of coal. 2. A method according to claim 1, characterized in that the maximum initial temperature of the minimum layer of cooled coal is determined by the pyrolysis temperature according to the formula 0.35 tn + 157.9, where ty, is the pyrolysis temperature. Sources of information taken into account during the examination 1. Kislitsyn L.N. and others. Technique and technology of production of charcoal in the USSR and abroad. M., 1969, p. nineteen. 2. Wilsdorf Joachim, Friberger Forschungsh. - RJ. Chemistry, 1967, A, 411, p. 53-80, 19P35 (prototype).