Sulfuric acid evaporator for refined acid producing apparatus

Abstract

The invention discloses a sulfuric acid evaporator for a refined acid producing apparatus. The sulfuric acid evaporator is provided with a nicotinic acid tank and a water vapor tank, wherein the bottom portion of the nicotinic acid tank is provided with a nicotinic acid inlet, the top portion of the nicotinic acid tank is provided with a SO3 gas outlet, both side walls on the middle portion of the nicotinic acid tank are respectively provided with a nicotinic acid outlet, the top portion of the water vapor tank is provided with a steam inlet, the bottom portion of the water vapor tank is provided with a condensed water outlet, a U-shaped tube bundle is arranged inside the nicotinic acid tank, the inlet of the U-shaped tube bundle is positioned inside the water vapor tank and is communicated to the steam inlet, the outlet of the U-shaped tube bundle is positioned inside the water vapor tank and is communicated to the condensed water outlet, both sides on the middle portion inside the nicotinic acid tank are respectively provided with an overflow groove, and the bottom portion of the overflow groove is communicated to the nicotinic acid outlet. According to the present invention, the sulfuric acid evaporator is changed into the horizontal evaporator, the U-shaped tube bundle is used, the medium inside the tube bundle is the steam, the nicotinic acid is arranged outside the tube bundle, the actual pressure component of the equipment is reduced, the tube bundle welding seam on the tube nest contacts the steam, no corrosion is generated, and the acid inflow structure and the acid outflow structure of the evaporator consider the uniform flowing so as to ensure the uniform evaporation.

Description

technical field [0001] The invention relates to the related technical field of sulfuric acid production equipment, in particular to a sulfuric acid evaporator used in a refined acid production device. Background technique [0002] to combine Figure 4 As shown, the original vertical rising film evaporator has niacin as the medium in the tubes and 0.8MPa low-pressure steam outside the tubes. It has high requirements for the pressure bearing and thermal expansion compensation of the equipment cylinder, and there are many welds on the flower plate, and it is in contact with niacin. , easy to corrode and leak; uneven flow of nicotinic acid, easy to produce uneven evaporation, poor inspection and maintenance conditions, and high difficulty. It is difficult to handle nicotinic acid before maintenance, and there is no liquid level gauge in operation, so it is difficult to control the liquid level. The main corrosion-resistant materials have a narrow application range for the concen...

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Problems solved by technology

[0002] combine Figure 4 As shown, the original vertical rising film evaporator has niacin as the medium in the tubes and 0.8MPa low-pressure steam outside the tubes. It has high requirements for the pressure bearing and thermal expansion compensation of the equipment cylinder, and there are many welds on the flower plate, and it is in contact with niacin. , easy to corrode and leak; uneven flow of nicotinic acid, easy to produce uneven evaporation, poor inspection and maintenance conditions, and high difficulty

It is difficult to handle nicotinic acid before maintenance, and there is no liquid level gauge in operation, so it is difficult to control the liquid level. The main corrosion-resistant materials have a narrow application range for the concentration of nicotinic acid, and the leakage failure rate of equipment is high.

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