Flue gas purifying device and circulating fluidized bed boiler with device

Abstract

The invention discloses a flue gas purifying device and a circulating fluidized bed boiler with the device, and belongs to the technical field of boiler environment friendliness. The flue gas purifying device and the boiler are used for treatment of nitrogen oxides and sulfides. The flue gas purifying device comprises a plurality of pipelines which are arranged in parallel or alternatively, each pipeline comprises a middle segment, an inlet segment and an outlet segment, and the inner diameter of each inlet segment and each outlet segment is smaller than the inner diameter of a portion defined by the corresponding middle segment; and in view of the technical scheme, simultaneous and efficient treatment of the nitrogen oxides and the sulfides in flue gas through the enhanced SNCR technology can be achieved, equipment investment and operating maintenance cost can be reduced, and the pollution of secondary heavy metal pollution is completely eradicated.

Description

technical field [0001] The invention belongs to the technical field of boiler environmental protection, and in particular relates to a flue gas purification device and a circulating fluidized bed boiler equipped with the device. Background technique [0002] The circulating fluidized bed can make small particles of coal and air boil in the furnace, so that the high-speed airflow can fully contact and burn the dense suspended coal particles carried by it. Due to its high reliability, high stability, high availability, high environmental protection characteristics and wide fuel adaptability, circulating fluidized bed has attracted more and more attention, and is suitable for my country's national conditions and development trends. [0003] However, during the use of the circulating fluidized bed, the flue gas generated contains more nitrogen oxides and sulfides, which are one of the main harmful substances that pollute the air. In order to deal with harmful substances such as...

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Problems solved by technology

[0003] However, during the use of the circulating fluidized bed, the flue gas generated contains more nitrogen oxides and sulfides, which are one of the main harmful substances that pollute the air.

In order to deal with harmful substances such as nitrogen oxides, technologies such as SCR and SNCR are mainly used at home and abroad to treat nitrogen oxides. The above two technologies use ammonia water as a reducing agent to treat nitrogen oxides in the process of processing nitrogen oxides. reaction, SCR mainly uses TiO 2 as a carrier to contain V 2 o 5 The composition of the catalyst is used as a catalyst to speed up the reaction, and the denitrification rate is high, but it is easy to cause the loss of the catalyst, the equipment occupies a large space, and the investment and operation costs are high. The catalyst is easy to cause secondary heavy metal pollution when the catalyst is operated carelessly; although the use of SNCR technology reduces The use of catalysts reduces the cost of equipment operation investment, but the reaction is not complete, the denitrification efficiency is low, the ideal denitrification rate cannot be achieved, and the flue gas purification effect is not thorough

In order to deal with the sulfide contained in the flue gas, the commonly used technology is the limestone method or the double alkali method for desulfurization, but the above-mentioned sulfide treatment method and the nitrogen oxide treatment method are carried out separately in practical applications, and the treatment equipment Many, complex process, high investment cost

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