Separating and returning adjusting and controlling system of low-emission type circulating fluidized bed boiler and integrated method

Abstract

The invention provides a separating and returning adjusting and controlling system of a low-emission type circulating fluidized bed boiler and an integrated method. The separating and returning adjusting and controlling system of the low-emission type circulating fluidized bed boiler comprises a hearth, a separation device, a returning device, a slag discharging pipe, a slag discharging adjustmentvalve, a slag cooler, a coal slag discharging pipe, a coal slag discharge adjusting valve, a coal slag cooler, an ash discharging pipe, an ash discharging adjusting valve, an ash cooling machine anda coal slag removing machine. The inlet end of the ash discharging pipe extends into an air chamber to communicate with the bottom of a returning valve. The position of a moving cylinder is adjusted in a fixed cylinder. The integration method comprises the steps of firstly, under the condition that the load of the boiler descends or the caloric value of the fuel of the boiler descends, conductingfuel combustion and smoke and ash separation; and secondly, discharging the coal slag. According to the separating and returning adjusting and controlling system of the low-emission type circulatingfluidized bed boiler and the integrated method, by means of independent control over the amounts of separated ash and returning ash, discharging coal slag and discharging ash or integrated control over the amounts of separated ash and returning ash, discharging coal slag and discharging ash, the amount of separated ash, the amount of returning ash and the bed material of a bed hearth can be adjusted when the boiler is under a low load or fuel suddenly changes, so that the temperature field in the hearth is reasonable and uniform, the boiler can operate stably, stably and efficiently for a longtime, and ultra-low emission of NOX and SO2pollutans is achieved.

Description

technical field [0001] The invention relates to a boiler separation and return control system and an integration method, in particular to a low-emission circulating fluidized bed boiler separation and return control system and integration method. Background technique [0002] Circulating fluidized bed boiler is an environmentally friendly and energy-saving combustion technology. With the application of low-emission circulating fluidized bed boilers using high-efficiency separators and self-balancing return feeders, the optimization of the combustion system has been achieved, and the flow state has been restructured, and good results have been achieved. However, fuel replacement and sudden load changes will affect the safe and stable operation of the boiler, energy-saving combustion and environmentally friendly emissions. Due to the improvement of the separation efficiency of the boiler, the fine ash in the circulating material increases, the bed quality is improved, the bed ...

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Problems solved by technology

[0003] The invention aims to solve the problems of excessive circulating material volume, unstable combustion and flameout, decreased desulfurization efficiency in the furnace, low boiler combustion efficiency and high pollutant discharge when the load of the existing low-emission circulating fluidized bed boiler decreases or the calorific value of the fuel decreases. , and then provide a low-emission circulating fluidized bed boiler separation and return control system and integration method

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