Device and process for changing one-tower calcium desulphurization to double-tower ammonia desulphurization

Abstract

The invention belongs to the technical field of environmental protection, relates to a device and a process for ammonia desulphurization, which are changed by using a calcium desulphurization device, is especially suitable for modifying an original calcium desulphurization device or newly building an ammonia desulphurization device in a thermal power plant, and solves the problems of secondary pollution in a calcium desulphurization process, insufficient steel structure strength, insufficient layering height, difficulty for repairing an anti-corrosion layer, no high temperature resistance of an anti-corrosion material, rapidly changed temperature and the like in a calcium desulphurization tower during modification and low desulfurization amount in an existing technology of changing one-tower calcium desulphurization to double-tower ammonia desulphurization. According to the device and the process, an original dust remover, gas-gas heat exchanger, circulating pump, crystal slurry pump and cyclone are completely utilized, the calcium desulphurization tower is used as an oxidation tower, devices such as an absorption tower are configured, and the purposes of purifying and discharging flue gas and avoiding the secondary pollution are achieved.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a device and process for changing an ammonia-based desulfurization device from a calcium-based desulfurization device, and is especially suitable for the transformation of the original calcium-based desulfurization device in thermal power plants or newly-built ammonia-based desulfurization devices. Background technique [0002] At present, the known calcium method (ie, limestone method) desulfurization process produces waste liquid during operation, and at the same time, waste residue calcium sulfate is generated, causing secondary pollution. However, ammonia desulfurization can eliminate the discharge of waste liquid and waste residue, and the ammonium sulfate produced can be used. Therefore, many calcium desulfurization methods are converted to ammonia desulfurization with high efficiency and low energy consumption. The most expensive desulfurization tower in ca...

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Problems solved by technology

[0003] In order to overcome the deficiencies of the existing technology, solve the secondary pollution caused by calcium desulfurization, and the steel structure of the calcium desulfurization tower in the reconstruction of the calcium desulfurization tower is insufficient, the layer height is insufficient, the anti-corrosion layer is difficult to repair, and the anti-corrosion materials are not good enough. Resistance to high heat and rapid temperature changes, etc., as well as the problem that the desulfurization amount is too small in the existing calcium desulfurization and ammonia desulfurization technology, the present invention provides a single-tower calcium desulfurization device to a multi-tower ammonia desulfurization device and The process fully utilizes the original dust collector, gas-gas heat exchanger, circulation pump, crystal slurry pump, and cyclone, uses the calcium desulfurization tower as an oxidation tower, and is equipped with absorption towers and other devices without changing the internal structure of the desulfurization tower , to achieve the purpose of flue gas purification and emission without causing secondary pollution

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