Desulfurization device and desulfurization method

Abstract

The invention provides a desulfurization device. The desulfurization device comprises a draught fan, a lime stone cabin, a gas storage tank and a circulating fluidized bed boiler, and is characterized in that the circulating fluidized bed boiler comprises a hearth, a material returning pipe and a square separator, wherein the upper part of the square separator is communicated with the upper part of the hearth; the lower part of the square separator is connected with the lower part of the hearth by the material returning pipe and a coal falling pipe is arranged on the hearth; the draught fan is connected with the bottom of the lime stone cabin by a heating device; the upper part of the lime stone cabin is connected with a bag dust remover and the lower end of the lime stone cabin is connected with a feeding machine by an unloading valve; the feeding machine is connected with a feeding pipe; the gas storage tank is connected with the feeding pipe and the feeding pipe is connected with the coal falling pipe. The invention further provides a desulfurization process utilizing the desulfurization device; the conveying speed of lime stones is 12m / s-14m / s and the gas-solid ratio is 1 to (3-6). The production cost of the equipment is reduced, the desulfurization effect of the circulating fluidized bed boiler is improved and the economic benefits are good.

Description

technical field [0001] The invention belongs to the technical field of boiler equipment, and in particular relates to a desulfurization device and a desulfurization method. Background technique [0002] There are various coal-fired desulfurization methods for boilers. Among them, circulating fluidized bed boilers (CFB boilers for short) are one of the more mature clean combustion methods. They have good environmental protection performance and can easily achieve desulfurization in the furnace. They have developed rapidly in China. In particular, the CFB dry desulfurization device is widely used due to its advantages of small investment, low operating cost, and no secondary pollution. [0003] At present, the separators used in the combustion technology of circulating fluidized bed boilers are mostly circular separators. The manufacturing of circular separators is difficult and costly. The requirements for the accuracy of limestone particle size are high, and the cost of indu...

AI Technical Summary

Problems solved by technology

"However, the actual operation situation is that most of the limestone particle size below 1.0mm escapes with the fly ash in the square separator, and the separation efficiency is low in industrial applications. Although the square separator has technical advantages such as low manufacturing cost and convenient maintenance and implementation , but it has gradually shown its unfavorable side in the existing industrial applications

[0005] The conventional limestone inlets of the current circulating fluidized bed boilers are generally set at the furnace roof, the side of the water wall, and the inclined legs of the return material, which may easily cause poor combustion stability of the boiler, and are prone to unfavorable problems such as fire extinguishing, coking, and wear of the furnace wall; The location is relatively high. Theoretically, the recycled limestone powder is easy to escape with the airflow during the process of entering the high-temperature furnace from top to bottom, resulting in a low actual utilization rate. Impact and damage the already formed reaction gas flow balance, interfere with the progress of the desulfurization reaction, which is not conducive to the improvement and stability of the reaction efficiency

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