Circulating fluidized bed process sintering flue gas desulfurization system capable of preventing hardening of filter bag of dust collector

Abstract

The invention discloses a circulating fluidized bed process sintering flue gas desulfurization system capable of preventing hardening of a filter bag of a dust collector. The system comprises a sintering machine, an electrostatic precipitator and a main exhaust fan which are sequentially connected with one another, wherein the main exhaust fan is connected with a desulfurizing tower by a valve; the desulfurizing tower is connected with a reaction tank filled with a desulfurizing agent, Ca(OH)2, and a water supply pipeline used for reducing the temperature of flue gas in the desulfurizing tower; the reaction tank is connected with a quick lime charging bucket and a water pipe; the desulfurizing tower is connected with a bag-type dust collector; flue gas of the bag-type dust collector is discharged into a chimney by an induced draft fan; most desulfurized fly ash of the bag-type dust collector returns back into the desulfurizing tower again in a circulating way, and little ash enters an ash bin and then is transported outside; a steam pipeline and a desulfurizing agent pipeline directly connected with the quick lime charging bucket are additionally arranged on the desulfurizing tower. After the system is adopted, the filter bag of the following dust collector is prevented from being hardened even if the initial temperature of the flue gas in the tower is too low; therefore, the situation that a sintering machine is forced to stop production as a desulfurization facility can not be used is avoided, and the loss of an enterprise can be avoided.

Description

technical field [0001] The invention relates to a sintering flue gas desulfurization system, in particular to a circulating vulcanized bed method sintering flue gas desulfurization system which prevents the compaction of dust collector filter bags. Background technique [0002] Sintering flue gas not only contains dust, but also contains a large amount of SO 2 , NO X At present, the sintering flue gas desulfurization system adopts wet method, dry method and semi-dry method. Removal of SO by circulating fluidized bed method 2 The reaction principle is: SO 2 with Ca(OH) 2 (desulfurizer) reaction to generate CaSO 3 ﹒ 1 / 2H 2 O, CaSO 4 ﹒ 1 / 2H 2 O and a small amount of CaCl 2 , CaF 2 and other desulfurization by-products. [0003] Such as figure 1 As shown, the circulating fluidized bed method sintering flue gas desulfurization system in the prior art includes a sintering machine 1, an electrostatic precipitator 2, and a main exhaust fan 3 connected in sequence. The ...

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Problems solved by technology

[0005] However, the existing circulating fluidized bed sintering flue gas desulfurization system has the following problems: when the sintering machine is in normal production, the desulfurization system can operate relatively stably, and various environmental protection indicators can meet the emission standards

In this way: ① In the early stage of starting the sintering machine, the low-temperature sintering flue gas is likely to cause hardening of the bag of the dust collector. Once hardened, the bag can only be replaced. For 360m 2 For 10,000 pieces of bag filter for sintering desulfurization, the cost of replacement will be about 8 million yuan (filter material is imported PTFE); ②If no water is added at this time, the SO 2 Does not react well with desulfurizers, resulting in SO 2 Exceeding the standard discharge will not only pollute the environment, but also the enterprise will be punished by the environmental protection department, resulting in the suspension of production

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