Method and device for measuring boiler hearth ash fouling coefficient online

A coefficient and fouling technology, which is applied to the indication of boiler working conditions, etc., can solve the problems of large model error, large fluctuation of input parameters, and long measurement lag time.
CN108716664AActive Publication Date: 2018-10-30ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
Publication Date
2018-10-30

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Abstract

The invention discloses a method and a device for measuring the boiler hearth ash fouling coefficient online. The method comprises the following steps that (1) under a boiler reference operation state, a three-variable test of a plurality of operation conditions is carried out, and the change rule of the specific flame radiation temperature under the boiler reference state is obtained; (2) under the actual operating state of the boiler, operation parameters including the load of a hearth, the feeding state of a pulverized coal burner, a burner swing angle and the like are measured, and the specific flame radiation temperature is determined under the actual operation state; (3) the flue-gas temperature of the section of the hearth below the flame deflection angle is measured, and accordingto the average value of the flue-gas gas temperature in the section of the hearth and the specific flame radiation temperature in the actual operation state, the average radiation temperature of flames in the boiler is determined; (4) according to inlet and outlet working quality parameters of a water cooling wall evaporation system, the radiant heat flow of the heating surface of the water cooling wall of the hearth is determined; and (5) by utilizing the radiant heat flow of the heating surface of the water cooling wall and the average radiation temperature of the flames in the boiler, the ash fouling efficient of the heating surface of the hearth is determined according to the flame radiation law.
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Description

technical field

[0001] The invention belongs to the field of operation monitoring and diagnosis of ash accumulation in a boiler furnace, and in particular relates to a method and a device for online measuring the ash coefficient of a heating surface of a furnace. Background technique

[0002] The ash accumulation and slagging on the water wall of the boiler furnace increase the heat conduction resistance of the heating tube, the temperature of the tube wall increases, the radiant heat projected to the flame by the heating tube in the opposite direction increases, the heat transfer efficiency of the furnace decreases, and the temperature of the flue gas at the furnace outlet increases. The desuperheating water consumption of the superheater or reheater increases, which reduces the economy and safety of boiler operation.

[0003] At present, soot blowers are usually used to remove soot and slagging in the furnace, but soot blowers consume a lot of steam and heat, and frequent ...

Claims

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