Flue gas boiler desulfurization system

Abstract

The invention relates to a flue gas boiler desulfurization system, which comprises a hearth, an end flue, a cyclone separator, and a mixer; the hearth and the end flue communicate with each other, and are formed as a whole; the input end of the cyclone separator communicates with the end flue via a flue gas pipe, the output end of the cyclone separator communicates with the input end of the mixer via a air-introducing pipe, a fan is arranged on the air-introducing pipe, and the fan can accelerate hot gas in the air-introducing pipe to enter the mixer; the mixer communicates with the hearth; a lime powder storage bin is arranged at the upper end of the mixer, and the output end of the lime powder storage bin communicates with the mixer. Compared with the prior art, the flue gas boiler desulfurization system can recycle high-temperature flue gas to stabilize hearth temperature and increase the efficiency of desulfurization; moreover, lime powder is sprayed into the hearth and burnt in the lower part of the hearth, so that the combustion of a material bed can be controlled to be stable, and thereby the risk is decreased.

Description

technical field [0001] The invention relates to the technical field of desulfurization, in particular to a flue gas furnace desulfurization system. Background technique [0002] At present, the flue gas SO at the end of coal-fired boilers 2 The concentration often exceeds the national emission standard, and it is necessary to desulfurize the flue gas SO 2 Concentration treatment. At present, the most used method is the desulfurization method in the furnace + outside the furnace. The desulfurization method in the furnace basically uses limestone (CaCO 3 ) powder, under high temperature conditions in the furnace, limestone (CaCO 3 ) decomposes to produce lime (CaO) and CO 2 , CaO and SO 2 reaction, such that the SO in the flue gas 2 It is adsorbed and removed by CaO, so as to reduce SO in flue gas 2 Concentration purposes. This furnace desulfurization method requires the use of higher pressure air to desulfurize (CaCO 3 ) is sprayed into the furnace, and decomposed int...

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Problems solved by technology

[0003] The purpose of this invention is to provide a flue gas furnace desulfurization system. The technical problem to be solved is: on the one hand, when the blower injects stone powder, it also brings in a considerable part of cold air, which will cause the temperature of the furnace to drop; on the other hand On the one hand, limestone powder is sprayed into the furnace and burned under the furnace, which will make the combustion of the material bed difficult to control and stabilize, and the risk of material bed sinking and coking will occur

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