Heat balance monitoring method for coal-fired power plant

Abstract

The invention relates to a heat balance monitoring method for a coal-fired power plant. The method comprises the following steps: acquiring data and carrying out statistical sorting according to different load intervals; calculating the boiler efficiency of each load interval, and calculating each heat loss rate of a single unit and the weighted heat efficiency of the single unit; according to the steam turbine heat rate load characteristic curve, determining the steam turbine heat rate of each load interval, calculating the weighted heat rate of a single steam turbine, and obtaining the actual heat rate of the single unit; calculating the coal consumption of a single unit boiler, calculating the ratio of the coal consumption of the single unit boiler to the coal quantity of the coal feeding belt scale, and carrying out analysis and judgment; and calculating heat flow direction data of the unit, and drawing a heat balance flow direction diagram of the unit. According to the method, the coal quantity of the coal feeder can be accurately checked, the problems existing in a weight checking method are solved, the heat utilization efficiency and loss composition of the unit can be effectively mastered by obtaining the heat balance flow diagram of the unit, the problems existing in the unit can be conveniently found in time, and a technical basis is provided for improving the energy utilization efficiency of a power plant.

Description

technical field [0001] The invention belongs to the technical field of coal-fired units, and in particular relates to a method for monitoring the heat balance of a coal-fired power plant. Background technique [0002] At present, the fuel cost of large coal-fired power plants accounts for about 70% of the power generation costs of the entire power plant, and fuel management is very important for every coal-fired power plant. Coal-fired power plants carry out positive balance statistics on coal consumption, and generally use the belt scale of the coal feeder as the standard to calculate the amount of coal. As the accumulation of running time increases, the belt scale will produce tension deviation, so the belt scale entering the furnace needs to be weighed every month. However, the verification by simulation method cannot accurately eliminate the deviation, and the coal feeder platform lacks the spatial layout conditions for physical verification, so the current verification ...

AI Technical Summary

Problems solved by technology

Coal-fired power plants carry out positive balance statistics on coal consumption, and generally use the belt scale of the coal feeder as the standard to calculate the amount of coal. As the accumulation of running time increases, the belt scale will produce tension deviation, so the belt scale entering the furnace needs to be weighed every month. code verification, but the verification by simulation method cannot accurately eliminate the deviation, and the coal feeder platform lacks the space layout conditions for physical verification, so the current verification method for coal quantity still has certain defects

In addition, it is important to monitor data such as heat input, effective use, and whereabouts of losses of the generator set, analyze the heat balance state of the unit in real time, and optimize and adjust the unit based on this, so that the unit can operate under the best working conditions. Practical significance and considerable necessity, but it is currently impossible to monitor the thermal balance state of the unit accurately, timely and comprehensively and objectively

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