Rapid variable-load circulating fluidized bed boiler

Abstract

The invention relates to a rapid variable-load circulating fluidized bed boiler, comprising a hearth, a material separator, return feeders, ash control valves, rapid peak regulation bins and peak regulation bin return pipes, wherein the rapid peak regulation bins are communicated with the return feeders and are connected with the lower part of the hearth by means of the peak regulation bin returnpipes; the ash control valves are arranged on communicating pipes between the return feeders and the rapid peak regulation bins; air distribution devices are arranged at the bottoms of the rapid peakregulation bins, and are set according to a fluidization wind speed of 0.3-1m / s in the rapid peak regulation bins; each rapid peak regulation bin is internally provided with an ash baffle plate; the cross sections of the rapid peak regulation bins are rectangular or circular; two or more rapid peak regulation bins are available, and are arranged corresponding to the return feeders in a way of one-to-one correspondence. Due to the reasonable arrangement of components such as feed legs, the return feeders, the return pipes and the rapid peak regulation bins, the rapid change of material concentration in the boiler is realized in a peak regulation process, and the requirement that the power grid has a rapid response to steam parameters can be met.

Description

technical field [0001] The invention introduces a rapidly variable load circulating fluidized bed boiler, which belongs to the field of combustion equipment, and in particular relates to the field of circulating fluidized bed boilers. Background technique [0002] At present, my country's energy system has begun to gradually develop from traditional coal energy to low-carbon energy. With the strategic transformation of the power generation industry and the adjustment of the power structure, the installed capacity of new energy power has grown rapidly. As of the end of 2017, the installed capacity of wind power and solar power in my country has reached 294 million kW, accounting for 16.5% of the country's total installed capacity. Among them, the photovoltaic installed capacity was 130 million kW, a year-on-year increase of 68.7%. [0003] Compared with traditional thermal power, the growth rates of wind power and photovoltaics are very obvious. Due to the lag in the constr...

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Problems solved by technology

[0004] For circulating fluidized bed boilers, when the unit is lifting and lowering the load, there is a large amount of bed material in the furnace, and the large heat storage leads to large thermal inertia in the heat transfer process in the furnace. When the power generation load changes, it is difficult for the boiler steam parameters to respond quickly , so that the load change rate of circulating fluidized bed boilers is significantly lower than that of pulverized coal boilers

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