Novel cement kiln semi-dry desulfurization system

Abstract

The invention provides a novel cement kiln semi-dry desulfurization system. The system comprises a No.1 cement kiln cyclone and a No.2 cement kiln cyclone, which are vertically arranged in sequence and are connected together by a pipeline, wherein a discharge pipe is arranged at the bottom of the No.2 cement kiln cyclone; the lower part of the discharge pipe is connected with a raw material silo, a lime slurry wet digestion tank, a lime slurry storage tank and a slaked lime water atomized spray system by a pipeline in sequence; the tail end of the slaked lime water atomized spray system is connected with a preheater arranged on the No.1 cement kiln cyclone by a pipeline. The novel cement kiln semi-dry desulfurization system has the beneficial effects that the system can achieve more than or equal to 70% of desulfurization efficiency, belongs to the semi-dry desulfurization technology, combines the advantages of a dry reactant injection method and the spray drying desulfurization technology, overcomes the defects of the dry reactant injection method and the spray drying desulfurization technology and can not cause other pollution; meanwhile, reactants are derived from hot raw materials, thus reducing the investment costs and operating costs of traditional desulfurization processes.

Description

technical field [0001] The invention relates to a desulfurization system, in particular to a novel cement kiln semi-dry desulfurization system with low cost and high efficiency. Background technique [0002] In recent years, with the country's stricter requirements on the discharge of industrial pollutants, the air pollutants of key domestic industrial enterprises include SO 2 , NOx and other emissions have been included in the key monitoring content, and emission monitoring has become normalized. In this context, traditional industries such as iron and steel and electric power have developed mature flue gas desulfurization technologies after decades of development. [0003] Compared with these enterprises, the desulfurization technology of the cement industry, especially the new dry process cement production line, develops relatively slowly. On the one hand, due to the natural alkalinity of the cement kiln, the interior becomes a natural desulfurization device, which can s...

AI Technical Summary

Problems solved by technology

Compared with the previous several desulfurization processes, the efficiency of this method is higher, but it still cannot meet the requirements of high SO 2 The requirements for desulfurization efficiency when the emission concentration is high, and the lime in this method comes from the calciner, so the whole system is relatively complicated

In addition, some companies spray ammonia water into the humidification tower, but the efficiency is relatively low, and there is a certain corrosion to the system, and the ammonia escape is relatively high

[0012] The desulfurization efficiencies of the above several technologies are all low, and when dealing with high concentration SO 2 The effect is not good when the emission value reaches or exceeds 800mg / Nm 3 In the future, it will be difficult to meet the discharge standards, and it will also have high operating costs. Therefore, we need to develop high-efficiency and low-consumption cement kiln desulfurization technology

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