SU1375300A1 - Method and apparatus for cleaning gases from sulfur dioxide - Google Patents

Abstract

The invention relates to chemical technology and machine building and can be used to sanitize gases from sulfur dioxide. The purpose of the invention is to intensify the process of absorption of sulfur dioxide due to a rational change in the density of irrigation and the freshness of the suspension along the length of the contact zone. In accordance with the method of sanitary cleaning of gases from sulfur dioxide, the central part of the contact zone of the device is irrigated with a stream of circulating suspension supplied to the housing 1 through the nozzle 4, and the irrigation of the inlet and outlet of the contact 3otiftii is performed by fittings 3 and 5. The spent suspension is taken from the housing 1 when help fittings 6-8. At the same time, the flow of the suspension withdrawn through the nozzle 6 is fed to the irrigation of the central part of the contact zone by means of the nozzle 4, and the flow of the suspension from the nozzle 7 is directed to the irrigation of the exit of the contact zone through the nozzle 5. The fresh suspension is fed to the inlet the contact zone through the fitting 3. The device is equipped with contact elements 2, made in the form of inclined plates, and its body 1 has a rectangular shape and against the stroke of the gas phase. 2 s. and 2 z. p. f-ly, 1 ill. / (L 00 m el 00

Description

The invention relates to limiting technology and apparatus construction and can be used for sanitary cleaning of gases from sulfur dioxide.

The purpose of the invention is to intensify the process of absorption of sulfur dioxide due to a rational change in the density of irrigation and the freshness of the suspension along the length of the contact zone.

The drawing shows a device for sanitary cleaning of gases from sulfur dioxide, a longitudinal section.

The device for sanitary cleaning of sulfur dioxide gases includes a horizontal body 1 with contact elements 2, made in the form of blocks of inclined plates, fittings 3 5 for supplying a water suspension of pyrolusite to irrigate the entrance of the contact zone, its central part and output, respectively, as well as fittings 6-8 for removal of the spent. Suspension from various sites of a contact zone.

According to the method of sanitary purification of gases from sulfur dioxide, the central part of the contact zone is irrigated with a stream of circulating suspension supplied to the device body 1 through fitting 4, and irrigation of the input and output of the contact zone is performed by fittings 3 and 5. The spent suspension is taken from housing 1 using fittings 6 -eight. In this case, the flow of the suspension withdrawn through the nozzle 6 is fed to the irrigation of the central part of the contact zone, carried out with the help of the nozzle 4, and the suspension flow from the syringe 7 is directed to the irrigation of the exit of the contact zone through the nozzle 5. Fresh suspension is fed to the input of the contact zone through fitting 3.

Before putting the device into operation, buffer tanks (not shown) are connected, connected with fittings 3-5 irrigations. During operation of the device, there is a cross-flow movement of the interacting 11p1x phases, at which the suspension flows in the form of a thin film over the surface of the plates and is crushed by the gas flow into droplets, resulting in a developed and constantly renewed contact surface, which, combined with a rational change irrigation density and freshness of the suspension along the length of the contact zone provides an effective

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gas purification from sulfur dioxide, which in the presence of pyrolusite reacts with oxygen contained in the liquid phase to form sulfur trioxide, which, reacting with water, forms sulfuric acid.

Example. The waste gases of sulfuric acid production in the amount of 120,000, containing 0.3% sulfur dioxide, 7% oxygen and 92.7% nitrogen, heated to 70 ° C, are fed into the case of a rectangular apparatus, operating under an overpressure of 200 mm water. . The length of the apparatus is 15 m, height 4 m, width 3.5 m. In the cavity of the apparatus there are blocks of inclined plates 80 mm wide set at a distance of 100 mm from each other. The plate blocks are installed in pairs, with 600 mm wide service passages between each pair of blocks.

A fresh suspension in the amount of 8.65 t / h with the addition of 0.5 kg of pyrolusite is fed to the tail end of the apparatus, containing four blocks of inclined plates. The central part of the contact zone containing 52 blocks of inclined plates, circulating suspension in the amount of 110. In this case, the parts of the central part adjacent to the entrance zone containing four blocks of inclined plates, part of the circulating suspension is withdrawn and connected to the circulating stream irrigating the inlet gas.

The head of the apparatus, containing four blocks of inclined plates, is irrigated with a circulating stream of suspension in an amount of 10 containing 35% sulfuric acid. From the circulation loop at the inlet of the contact zone, the product acid is withdrawn in an amount of 3.9 t / h at a concentration of 40%. The gas leaving the apparatus contains,%: oxygen 6.5, nitrogen 87.6, water vapor 5.9, sulfur dioxide 0.01.

The proposed method can be used to purify gases from sulfur dioxide, the concentration of which can reach 3%, provided that the necessary oxygen concentration is available. Moreover, the most favorable conditions are created when cleaning gases with a high temperature.

Claims (4)

1. The method of sanitary cleaning of gases from sulfur dbuoxide, including the irrigation of gases with an aqueous pyrolusite suspension under conditions of constant load ratios in phases at the inlet and outlet of the contact zone, as well as in its central part, in order to intensify the absorption process sulfur dioxide due to a rational change in the density of irrigation and the freshness of the suspension along the length of the contact zone, the central part of the contact zone is irrigated with a stream of circulating suspension, from which part of the suspension is taken for irrigation of the input and the rest of the suspension is attached to the stream formed by washing with fresh gas suspension zones, while the irrigation density in the central part of the contact zone is higher than the irrigation density at the inlet. 2. A device for sanitary cleaning of gases from sulfur dioxide, comprising a housing with contact elements and fittings for feeding a pyrolusite aqueous suspension, characterized in that the housing is installed with a slope against the gas phase and is made with kinks, in the lower part of which is installed suspension fittings. 3. A device according to claim 2, characterized in that the body has a rectangular shape. 4. The device according to claim 2, characterized in that the contact elements are made in the form of blocks of inclined plates.