Dry type smoke purification system and smoke heating method thereof

Abstract

The invention discloses a smoke heating method of a dry type smoke purification system. The dry type smoke purification system comprises a smoke purification device and a recirculation flue used for introducing clean smoke at a gas outlet of the smoke purification device into a gas inlet. The smoke heating method comprises the following steps that (110) the clean smoke in the recirculation flue is heated; and (111) the clean smoke in the recirculation flue and untreated smoke are mixed and then introduced into the gas inlet. Accordingly, the clean smoke in the recirculation flue of the dry type smoke purification system is heated to increase the temperature of the smoke entering the smoke purification device, power consumption of the heating process is small, the cost is low, the difficulty is small, and the heat exchange rate is high, so that the smoke purification efficiency of the dry type smoke purification system is improved. The invention further discloses the dry type smoke purification system.

Description

technical field [0001] The invention relates to the field of flue gas purification, in particular to a dry type flue gas purification system and a flue gas heating method thereof. Background technique [0002] The technologies used in the dry flue gas purification system mainly include CFB (circulating fluidized bed method), SDA (spray drying absorption method), TR (transport bed reactor method), etc., which can remove HCl, HF, SO 2 , SO 3 , dust and other pollutants, can realize the collaborative purification of various pollutants, and has the advantages of small footprint, low investment, low operation and maintenance costs, etc., and has been widely used in the field of flue gas purification. [0003] The use of a dry flue gas purification system generally requires that the flue gas at the inlet of the flue gas purification device must reach a certain temperature in order to add water to cool down and optimize the reaction atmosphere during the reaction process, thereby ...

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Problems solved by technology

[0005] At present, the measures taken to solve the above technical problems are to directly heat the raw flue gas so that the target temperature is not lower than the minimum temperature value for the normal operation of the flue gas purification device. However, since the flow rate of the raw flue gas is usually large, direct heating The energy consumption of the original flue gas is large, the cost is high and difficult, and the difference between the temperature of the original flue gas and the target temperature is small, resulting in a small heat exchange rate during the heating process and a long heating time

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