Boiler slagging condition monitoring and controlling methods based on outlet temperature of combustion chamber

Abstract

The invention discloses a boiler slagging condition monitoring method based on the outlet temperature of a combustion chamber. The monitoring method includes the steps of 1, detecting the outlet temperature of the combustion chamber; 2, calculating the temperature change before and after soot blowing and the temperature rising rate after soot blowing of an outlet of the combustion chamber according to detection in the step 1; and 3, judging that combusted coal tends to form slag when the temperature change is greater than 50 DEG C and the temperature rising rate is greater than 5 DEG / h, and judging that the combusted coal is not suitable for long-term combustion and adjusting the coal type when the temperature change is greater than 80 DEG C and the temperature rising rate is greater than 10 DEG / h. The invention further provides a boiler slagging condition controlling method based on the outlet temperature of the combustion chamber. According to the monitoring method and the controlling method, scientific use of a soot blower can be effectively guided, the outlet temperature of the combustion chamber can be continuously recorded, the temperature change before and after soot blowing and the temperature rising rate after soot blowing of the combustion chamber can be calculated, the use time of the soot blower can be further obtained, and the cleanliness degree of a water-cooled wall and the slagging characteristics of the coal type can be reflected.

Description

technical field [0001] The invention relates to the technical field of boiler combustion, in particular to a method for monitoring and controlling boiler slagging conditions based on furnace outlet temperature. Background technique [0002] When the boiler burns solid or liquid fuel containing ash, the heating surface of each part of the boiler is accompanied by mineral deposits to varying degrees. When the flue gas temperature is high, softened or molten ash particles stick to the heating surface during the combustion process, continue to grow and accumulate, resulting in slagging, resulting in deterioration of heat transfer, corrosion of the heating surface, and affecting the safe operation of the equipment. Boiler slagging is a very complicated process involving many factors. It is not only related to the composition and physical and chemical characteristics of the coal used, but also related to the design parameters of the boiler (such as the arrangement of the burner, t...

AI Technical Summary

Problems solved by technology

The main disadvantages are: 1) The layout of the heat flow meter is cumbersome and needs to be welded on the water-cooled wall, which changes the structure of the water-cooled wall and reduces the strength of the water-cooled wall; 2) It is very difficult for the power plant boilers that have been put into operation , it is necessary to stop the furnace for installation, and it is also difficult to maintain the measuring points; 3) The price of the heat flow meter is generally more expensive, and it is difficult to promote the use of multiple places in the furnace

The main disadvantages are: 1) Since the camera lens extends into the furnace, a water-cooled protective sleeve should be installed outside the lens to protect the camera lens from damage at high temperatures; Contaminated by fly ash in the furnace, it is necessary to form a protective air mold at the front of the lens through compressed air; 3) CCD cameras are generally arranged outside the furnace, requiring a complex optical system to ensure image quality

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