Absorption tower

 

The invention relates to a structural design of absorption tower, used in the manufacture of sulfuric acid in the stages of drying air or gas from moisture and absorption of the sulfur trioxide from the gas mixture. Absorption tower includes steel lined with acid-proof casing filled with a nozzle, inlet pipe to enter the gas or air mixture, the gas distribution grid and acid switchgear. On the bottom of the steel lined shell tower, coaxially with it, spread from a standard acid-proof brick cylindrical gas distribution grid with less than the body of the tower diameter. The lattice has a pass-through channels of different length at every level, and from the nozzle through the channels distributed over the cross section of the lattice step in the correct form of concentric polygons, with the length of the channels in the lower part of the maximum, and in the upper part is minimal. Distribution grid spread of acid-proof brick cylindrical body of the same diameter connected to the lining of the casing of the tower, with a height not less than the diameter of the inlet pipe, embedded in the body of the tower tangentially to the inside, is this her height is loaded nozzle larger than the size of the nozzle. The invention improves the efficiency teplomassoobmennyh processes and to reduce the volume of the nozzle. 1 C.p. f-crystals, 2 Il.

The invention relates to the constructive design of the absorption tower, used in the manufacture of sulfuric acid in the stages of drying air or gas from moisture and absorption of the sulfur trioxide from the gas mixture.

Known vertical nozzle apparatus used in the manufacture of sulfuric acid by the contact method.

The apparatus is a cylindrical refractory-lined container. At the bottom is a special ceramic design, which serves to maintain the nozzle. She is in packing or bulk packing layer height of 4-8 m, which are massoteploobmen processes. In the upper part of the apparatus are irrigation device in the form of nozzles, irrigation plates or chutes, distribution headers (C. M. Ramm, gas Absorption. M, Chemistry, 1976, S. 309).

Closest to the described design of the technical essence and the achieved result is known the Packed absorption tower, including steel lined to the gas distribution grid and kislotoobrazovanie device. In the known construction gas distribution grate includes laid on the bottom of the lined casing tower supporting pillars with laid them on the fire ceramic beams. The supporting pillars are made from acid-resistant brick.

Known absorption tower shown in Fig.1 and consists of lined with acid-proof housing (1), the input pipe to enter the gas or air mixture (2), naturally grates under the nozzle (3), the nozzle (4), collateralprinting device (5) (Handbook of sernokislotchika./Under the editorship of Prof. K. M. Malina. - M, Chemistry, 1971, S. 591-593).

The disadvantages of the known absorption towers is a complex of special design to support gas distribution grid with the use of scarce and expensive materials for its execution, the uneven distribution of gas or air mixture at the inlet of the nozzle, which reduces the efficiency of the absorption tower and, consequently, to the increase in the volume of used nozzles.

We were set a task to create an absorption tower, devoid of the above-described structural deficiencies and improve the efficiency talouselama the construction of the absorption tower. The tower includes a steel lined with acid-proof casing filled with a nozzle, inlet pipe to enter the gas or air mixture, the gas distribution grid and kislotoobrazovanie device. On the bottom of the steel lined shell tower, coaxially with it, spread from a standard acid-proof brick cylindrical gas distribution grid with less than building towers in diameter, having through channels of different length at every level, and from the nozzle through the channels distributed over the cross section of the lattice step in proper concentric polygons. The length of the channels in the lower part of the maximum, and at the bottom is minimal. Distribution grid spread of acid-proof brick cylindrical body of the same diameter, which is connected to the lining of the tower, with a height not less than the diameter of the inlet pipe, embedded in the body of the tower tangentially to the inner cylindrical brick building.

It is advisable Central inner portion of the gas distribution grid over the full height of the load attachment larger than the nozzle size.

Thus, the difference of the change is scarce and expensive-iron beams and improves the uniformity of the gas or air to the nozzle.

In Fig.2 shows the proposed design of the absorption tower, which includes: lined with acid-proof case (1), tangentially executed inlet pipe to enter the gas or air mixture (2), lined with acid-proof brick cylindrical gas distribution grid (3), having through channels of different length for the passage of gas at every level. Distribution grid lined with acid-proof brick cylindrical body of the same diameter (4). The body of the tower is filled with nozzle (5) and provided with kislotosoderjasimi device (6).

Absorption tower is as follows:

The gas mixture or air enters through an inlet tangentially made pipe (2) in the annular space between the casing (1) and inner lined with acid-proof brick, a cylindrical housing (4) on the gas grid (3), distributed around the perimeter of the annular space and evenly flows through the gas passages of the gas distribution grid at the nozzle of the absorption tower (5), which occur heat and mass transfer processes. The nozzle is irrigated concentrated sulfuric acid through the cyst of heat and mass transfer processes is achieved by increasing the height of the nozzle. But the air or gas mixture should be evenly distributed as the “main” tip height (i.e. the height of the nozzle, which is provided in the known construction) and “additional height (in the volume of gas distribution grids in the proposed design). The execution of the channels offered by way allows you to more evenly distribute the gas mixture or the air around the passage bore of the nozzle. However, in the proposed design of the hydraulic resistance to the passage of gas in the upper channels is not equal hydraulic resistance in the lower channels due to the hydraulic resistance of the nozzle, fill the inner part of the gas distribution grid. In order to equalize the hydraulic resistance through the channels, it is advisable Central inner portion of the gas distribution grid over the full height of the load attachment larger than the nozzle size.

The absorption towers of this design will simplify the control design of the gas distribution grid and eliminate the use of expensive and scarce acid-resistant ceramic-iron beams, to improve the distribution of the gas mixture n the DKI.

Claims

1. Absorption tower, which includes steel lined with acid-proof casing filled with a nozzle, inlet pipe to enter the gas or air mixture, the gas distribution grid and kislotoobrazovanie device, characterized in that on the bottom of the steel lined shell tower, coaxially with it, spread from a standard acid-proof brick cylindrical gas distribution grid with less than building towers in diameter, having through channels of different length at every level, and from the nozzle through the channels distributed over the cross section of the lattice step in the correct form of concentric polygons, with the length of the channels in the lower part of the maximum, and in the upper part of the minimum distribution grid spread of acid-proof brick cylindrical body of the same diameter connected to the lining of the casing of the tower, with a height not less than the diameter of the inlet pipe, embedded in the body of the tower tangentially to the inner cylindrical brick building.

2. Absorption tower under item 1, characterized in that the Central inner part of gazoraspredeleniye the

 

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