Starting process for circulating fluidized bed boiler

Abstract

The invention provides a starting process for a circulating fluidized bed boiler. The starting process for the circulating fluidized bed boiler comprises the following steps: filling a hearth with aninert bed material according to requirements at first; starting a bed oil gun to heat the bed material; after the temperature of the bed material reaches a fuel feeding temperature, adjusting the airquantity of a primary air fan to be higher than a critical fluidized air quantity; starting a fuel feeder and feeding starting fuels into the hearth from a coal filling opening; and stopping the oil gun when the temperature in the boiler is higher than 850 DEG C. The heating speed of the bed material is 60-80 DEG C / h, the fuel feeding temperature is 480-600 DEG C, and the starting fuels are a mixture of 50% of petroleum coke and 50% of coal according to the heat ratio. A bed gun system is disassembled due to lots of faults, and reduction of the coal feeding temperature to be 500 DEG C is feasible technically; and since the test is carried out and the process tries to run in ignition of the boiler, the boiler has been ignited for 8 times in the whole year, 28 t of fuels are saved every timeaveragely, and 224 t of fuels are saved, namely 560,000 China yuan is saved.

Description

technical field [0001] The invention relates to a process for starting a circulating fluidized bed boiler, in particular to a low temperature starting process for a circulating fluidized bed boiler without a bed gun. Background technique [0002] Circulating fluidized bed boiler technology is a high-efficiency, low-pollution and clean boiler combustion technology that has developed rapidly in recent decades. The starting and ignition methods of circulating fluidized bed boilers include fixed bed ignition, fuel fluidized ignition, hot flue gas fluidized ignition, separate bed ignition, etc. The ignition device of the circulating fluidized bed boiler includes an oil gun on the bed, an oil gun under the bed, and a solid fuel feeding port. The starting time of the circulating fluidized bed boiler is long, the main reason is that the fluidized bed boiler uses a large number of refractory materials, to avoid these parts of the boiler from being damaged by thermal pressure, the ci...

AI Technical Summary

Problems solved by technology

[0008] During the actual ignition and start-up operation of circulating fluidized bed boilers, the fuel consumption for start-up ignition is extremely high, the average fuel consumption is 60-80t / time, and the boiler start-up cost is extremely high; the poor atomization of the oil gun system under the bed causes local coking and serious wear and tear. The maintenance workload is heavy; the time required for the bed temperature to rise to the solid fuel pulverized coal by the oil gun on the bed is generally about 8 hours, and the ignition and start-up time is long

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