Method for selecting rotating direction of trisector regenerative air preheater of large power station boiler

Abstract

The invention discloses a method for selecting the rotating direction of a trisector regenerative air preheater of a large power station boiler, aiming to solve the problems that the present rotating direction of the air preheater always causes the moisture condensation of the air preheater or the insufficient drying output power of a pulverization system. The invention is characterized in that when the problems of air preheater moisture condensation caused by season changes or insufficient output power of the pulverization system appear, a motor is reversely rotated to drive a rotor to reversely rotate; and when a heat transfer element rotates, the heat transfer element sequentially passes through a smoke flowing area, a primary air flowing area and a secondary air flowing area for raising the temperature of primary air, thereby the problems of moisture condensation of the air preheater or drying output power of the pulverization system, and the like are solved.

Description

technical field [0001] The invention relates to the field of air preheaters, in particular to a method for selecting the rotation direction of an air preheater in a three-compartment warehouse of a large-scale coal power plant boiler. Background technique [0002] Due to the continuous development of the social economy, the society's demand for resources is growing rapidly, and the supply of electricity and coal is also tending to [0003] Due to the tension, the continuous rise of coal prices has directly caused the increase of power generation costs, while the electricity price linkage mechanism is lagging behind due to the influence of the country's overall economic environment. All these have brought huge operating pressure to power generation companies, and corporate profits have dropped sharply or even suffered losses. The work that power generation enterprises can carry out is [0004] It is to reduce unit energy consumption and minimize power generation costs. The...

AI Technical Summary

Problems solved by technology

However, due to the variety of coal types and the inferior quality of coal, the temperature of the primary air heated from the primary air circulation area is sometimes low, which will lead to insufficient drying output of the pulverizing system, directly affecting the work of the pulverizing system

In addition, because the working air pressure of the secondary fan is low and the blades are short, the secondary fan is generally equipped with a hot air circulation system, because the dust in the hot air will wear the blades less during the circulation process; while the primary fan is not equipped with a hot air circulation system. , because the working wind pressure of the primary fan is high, and its blades are long. If a hot air circulation system is installed, the dust in the hot air will wear the blades during the circulation process.

It is precisely because there is no hot air circulation system installed on the primary fan, the temperature of the primary air will be lower when the season changes or other reasons, and the current rotation direction (finally passing through the primary air circulation area) is likely to cause condensation or cooling of the air preheater. Insufficient drying output of the powder system