A method for putting into operation a w-flame once-through boiler into a dry burner

Abstract

The invention discloses a commissioning method for dry state transformation combustors of a W flame direct-current boiler. The commissioning method includes the steps that firstly, a combustor A2, a combustor A3, a combustor F1 and a combustor F4 in the middle in the boiler width direction are not subjected to commissioning; secondly, a combustor B2, a combustor B3, a combustor E1 and a combustor E4 are cut off selectively by adjacent fire nozzles of middle combustors according to the wall temperature condition of a water-cooling wall in the area; and thirdly, the commissioning number of the rest of combustors in each of the front row and the rear row is at least five, the difference of the numbers of the two rows of combustors is at most one, and the two rows of combustors are kept arranged alternately. The commissioning method adopting the combustors is used for conducting dry state transformation, heat loads in the heat-sensitive area of the water-cooling wall at the middle portion are effectively weakened, adjusting means for middle heat loads are added, the running environment of the heated face of the water cooling wall at the middle portion is further improved, the combustors are kept even so that the heat loads of the boiler can be evenly distributed in the boiler width direction as much as possible, it is avoided that fire nozzles in a certain area are concentrated, and therefore even state transformation is table, the heated face of the water-cooling does not exceed the temperature, the starting time is effectively shortened, the starting cost is saved, and the service life of a pipeline of the heated face of the water-cooling wall is prolonged.

Description

technical field [0001] The invention relates to a method for putting into operation a W-flame once-through boiler into a dry burner, and belongs to the technical field of operation control of a W-flame once-through boiler in a thermal power plant. Background technique [0002] For the W-flame once-through boilers that have been put into operation more at present, the FW-type boilers are more widely used. The burners of this furnace are arranged on the front and rear arches of the furnace. Only the burner, the layout of the burner is shown in Figure 1. Since the boiler was commissioned and put into commercial operation, overheating of the tube wall on the heating surface of the water-cooled wall is very likely to occur during the initial stage of starting-up and turning to dry state, which greatly affects the life of the tube. [0003] For the W flame once-through boiler, when the boiler turns to the dry state, because the boiler water pump is out of operation and there is n...

AI Technical Summary

Problems solved by technology

For example, among the four coal mills of B / E / C / D, some coal mills cannot be started due to defects, and when they are transferred to A and F mills, overheating of the central water-cooled wall often occurs

For the existing dry state operation control technology, in addition to adopting the pulverizing system combination method recommended by the boiler factory, the transition is relatively stable and reliable. For other pulverizing system combination methods, when the boiler turns dry The temperature is difficult to control, and sometimes the fuel input is quickly adjusted to take into account the water-cooled wall temperature, resulting in large fluctuations in superheat, frequent switching between dry and wet boilers, large fluctuations in transition, and long residence time. Therefore, the existing system for turning to dry Combination mode of powder system operation is relatively simple. When the important coal mill is defective and cannot be started, the boiler stays in a dry state for a long time, which reduces the life of the heating surface pipes and improves the start-up time under low load. The amount of fuel increases and improves start-up costs

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