Multi-tower type sulfuric acid low temperature heat energy recovering method and device thereof

Abstract

This invention relates to method for recovering low temperature level heat energy from sulfuric acid production multiple-towers, and the equipment therefore. The equipment is composed of: sulfuric acid production installation (SAPI), with the outlet connecting a low temperature recovery absorption tower (LTRAT); the outlet of the bottom of LTRAT is connected with a combined acid circulation tank (CACT); the top outlet is connected with the inlet of absorption tower of the SAPI; the CACT is connected with the inlet of evaporator by a high temperature sulfuric acid pump; the outlet of the evaporator is connected with the inlets of a acid cooling unit (ACU) and dilution unit (DU); the outlet of DU is connected with high level inlet of LTRAT; the outlet of the ACU is connected with the other inlet of the evaporator; the other inlets of ACU and DU is connected with feeding water tubes. This invention method can be used for multiple set of small scale sulfuric acid production units to recover low temperature level heat energy, solving the problem of long term returns on investment in prior art independent heat recovery units.

Description

technical field [0001] The invention relates to a method and a device for recovering low-temperature heat energy of multi-tower sulfuric acid. Background technique [0002] In recent years, as the world's conventional energy sources have become increasingly tense, people have paid more and more attention to the utilization of energy. The sulfuric acid plant is known as an energy plant, but for a long time in China, only the heat energy of the high-temperature sulfur burning conversion part has been recycled, while the low-temperature heat energy of the dry absorption part is still taken away by the circulating cooling water and wasted. Although the HRS technology of Monsanto of the United States and the HEROS technology of Lutz of Germany have been successfully applied abroad, they are used to recover the low-temperature heat energy of the dry absorption part of a single sulfuric acid plant, and the heat energy recovery rate of the sulfuric acid plant is increased to more th...

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Problems solved by technology

However, the current situation in China is that most of the sulfuric acid plants that have been built are not large in scale. Although the low-temperature recovery application of a single sulfuric acid plant has been applied to industrial production, the benefits are very obvious, but the construction cost of the low-temperature recovery plant is quite expensive. Large-scale sulfuric acid plants are built separately for low-temperature recovery, and the investment payback period will be too long, or the investment cannot be recovered within the designed service life.

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