SU709525A1 - Method of preparing sulfur dioxide - Google Patents

Description

I

The invention relates to a method for producing sulfur dioxide and can be used in the production of sulfuric acid.

A method is known for producing sulfur dioxide by burning elemental sulfur in two stages in a fluidized bed.

The method allows to obtain a gas of concentration SOs, 10-12 / o, but complex apparatus 1 is required to implement such a method.

The closest to the proposed technical essence and the achieved result is a method of producing sulfur dioxide, according to which the combustion of elemental sulfur is carried out in a fluidized bed in the presence of inert material. The ratio of sulfur to inert material is 1: (20-25). Air is fed under the bed at a speed of 0.8–1.5 m / s. Part of the sulfur vapor (40-60%) burns in the kin ndem layer, and the remainder - in the superlayer space.

The disadvantage of this method is the low intensity of the process, which is 0.2-1.2 t / m day 2.

The goal will invent; - intensification of the process.

The goal is achieved in the proposed method, in which sulfur is mixed with the ink material at otplozhenii. (2 4) n is burned in the air current, supplied to the iioiiCpxHOCTb. This mixture with a speed of 0.3-0.7 m / sec.

The differences in the method include the ratio of sulfur 1 to inert material and the rate of air supply to the surface of the layer.

This allows increasing the sulfur burning rate to 2.7-3.2 t / m day.

Claims (2)

When the content of inert material in the mixture is more than 4 weight. h intensity decreases and. For example, if the content of 5 parts of inert material in the mixture is 1.4 tons / day, and the combustion process becomes non-autothermic: when the content of inert material in the mixture is less than 2 parts, the intensity increases, but the sulfur content, y, increases. ie, exhausted with roasting gas, for example, with a content of 1.5 parts, the amount of vaporous sulfur in the calcining gas may be 2030, which means that it needs to be burned in special equipment. Air at a speed of 0.3-0.7 m / s is poured into the area above the layer, the mixture and inert material. The air speed limit of 0.7 m / sec. Allows you to touch the sulfur from the surface of the grains of the inert material, and also prevents the removal of particles with a diameter of more than 0.2 mm from the layer, and therefore does not require the burning of sulfur vapor and dust purification of gases. When the air velocity is less than 0.3 m / s, the sulfur burning rate noticeably decreases, for example, when the air speed is 0.2 m / s, the intensity is 1.5-1.8 t / m day. An example). A mixture containing 80 kg / h of sulfur and 160 k / h of sand, in an amount of 240 kg / h, is fed into a rotary kiln of the drum type, into which 500 air is blown at a speed of 0.7 m / s. The temperature of the process is 500 ° C. You get 550 im- / h of calcining gas with a content of 12% sulfuric anhydride and 0.1 g / nm dust. Irreversible sand loss from abrasion is 0.05 kg / hour. The sulfur burning rate is 3.2 tons / m day. The sand after the furnace is returned to the load again. Example 2. A mixture containing 80 kg / h of sulfur and 240 kg / h of sand, in an amount of 320 kg / hr, is fed into a drum-type drum, into which 500 nm- / h of air is blown at a speed of 0.5 m / s. Process temperature 450 ° C. You get 500 calcined gas with a content of 1% sulfuric anhydride and P, 1 g / nm dust. Irreversible sand loss from abrasion is 0.05 kg / hour. Sulfur burning intensity - 3.0 t / m day. The sand after the furnace is returned to the load again. Example 3. C. A mixture containing 80 kg / h of sulfur and 320 kg / h of sand, in an amount of 400 kg / h, is fed into a rotary kiln of the drum type, into which 500 n is blown. air speed of 0.3. m / s. Process temperature 550 ° C. In this way, 550 calcined gases are obtained with a content of 10% sulfuric anhydride and 0.1 g / nm of dust, the irreversible loss of sand during abrasion is 0.05 kg / h. The intensity of sulfur burning is 2.7 t / m-day. The sand after the furnace is returned to the load again. The invention of the method for producing sulfur dioxide by burning elemental sulfur in a mixture with returne inert material in air flow, characterized in that, in order to intensify the process, sulfur is displaced with inert materials m at a ratio of 1: (2-4), and air is supplied on the surface of the layer of this mixture with a speed of 0.3-0.7. m / s. Sources of information taken into account in the examination 1. Trudy NIUIF vol. 1969. 2. Shvartstshtein Ya. V. and others. Obtaining sulfur dioxide from elemental sulfur. M., “Himi, 1972, p. 10b-128.