Sodium pyrosulfite tail gas purification device

Abstract

The invention discloses a sodium pyrosulfite tail gas purification device which comprises a purification tower, a stirring purification cylinder, a supporting rotating shaft, a driving motor, a liquid conveying pipeline, a liquid inlet pipe, a spray head and a sludge discharging hopper. The spray head is correspondingly installed at the bottom end of a rotating supporting pipe, and the top end of the rotating supporting pipe is connected and communicated with the bottom end of the liquid inlet pipe through a rotating connector; every two adjacent gear bodies in the small follow-up gears are in transmission meshing in a gear meshing mode, and the small follow-up gear located at the leftmost end is in transmission meshing with the large driving gear in a gear meshing mode. A shaft body of the second power shaft extends into the tower cavity of the purification tower in a rightward matched mode, the shaft body is located at the bottommost end of the tower cavity, and the spiral conveying blade extends rightwards from the left side wall of the purification tower to the position of the sludge discharging hopper. The sprayer is large in spraying range and good in sludge discharge effect.

Description

technical field [0001] The invention relates to the related technical field of sodium pyrosulfite tail gas purification equipment, in particular to a sodium pyrosulfite tail gas purification device. Background technique [0002] Sodium metabisulfite is white or yellow crystalline powder or small crystals with a strong SO2 smell and a specific gravity of 1.4. It is soluble in water and its aqueous solution is acidic. When in contact with strong acids, it will release SO2 and form corresponding salts. It will oxidize when placed in the air for a long time. into Na2S2O6, so the product cannot be stored for a long time. Above 150°C, SO2 will be decomposed. There are two production routes of sodium metabisulfite: dry method and wet method. [0003] dry method. Stir the soda ash and water evenly according to a certain molar ratio. When the Na2CO3.nH2O is formed into a block, put it into the reactor, keep a certain gap between the blocks and then pass in SO2 until the reaction i...

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Problems solved by technology

[0008] When working, the drive motor 106 drives the support shaft 105 to rotate, and the infusion pipeline 101 delivers spray liquid to each liquid inlet pipe 102. After the spray liquid reaches the nozzle 103, it is sprayed downward from the nozzle 103, and the coke that floats upward The sodium sulfite tail gas and the spray liquid are purified in the tower cavity. Although this prior art purification device can purify the tail gas, there are two serious defects. One is that the traditional nozzle 103 cannot be fixed throughout the purification stage. Working in a dynamic form, the sprayed purification liquid is only sprayed from top to bottom along the vertical direction, which is easy to cause a small spraying range, and the inside of the tower cavity cannot be completely covered, resulting in that the tail gas of sodium pyrosulfite cannot be completely sprayed, and the purification is not thorough. The tail gas treatment is not comprehensive, and the scope needs to be expanded. Second, since the sludge discharge bucket 107 is correspondingly located at the bottom right end of the purification tower 1, the sludge is easy to accumulate on the left side of the bottom of the tower cavity during subsequent sludge discharge. location, leading to incomplete sludge discharge, there are great limitations

[0009] For this reason, it is particularly important to develop a device that can not only solve the problem of small spraying range of spray liquid, but also solve the problem of incomplete sludge discharge.

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