Supercritical boiler flexible peak shaving system and method

Abstract

The invention discloses a supercritical boiler flexible peak shaving system and method. A cold inlet of a steam boiler water heater communicates with an outlet of a coal economizer outlet header pipe and a water-cooled wall lower collecting box, and a steam pulverized coal heater is arranged on a primary air pulverized coal pipeline; and an inlet and an outlet of a hot steam extraction pipeline communicate with a reheating hot section steam mother pipe and a hot inlet of a steam boiler water heater respectively, a hot outlet of the steam boiler water heater is connected with a hot inlet of the steam pulverized coal heater, and a hot outlet of the steam pulverized coal heater is connected with a bled steam exhaust pipeline. The problem that the wet-state conversion load is high when a supercritical boiler runs under the ultra-low load is solved. Under the working conditions that a unit operates under ultra-low load and the boiler needs to be converted into wet state operation, boiler water from the outlet of the coal economizer to the water-cooled wall lower collecting box is heated, the ignition environment of pulverized coal is improved, and conversion into the wet state is delayed in the load reduction process; and steam heats primary air pulverized coal airflow, the temperature of the pulverized coal airflow is increased, pulverized coal ignition heat is reduced, and combustion stability is improved.

Description

technical field [0001] The invention belongs to the technical field of comprehensive transformation of supercritical boiler flexible peak regulation, and relates to a supercritical boiler flexible peak regulation system and method. Background technique [0002] Vigorously developing new energy is the direction of energy development and a requirement for accelerating the construction of ecological civilization. In recent years, new energy and nuclear power have continued to develop rapidly, and installed capacity and power generation have increased significantly year by year. With the adjustment of the energy structure and the accelerated development of clean energy, the power grid in some areas has insufficient peak-shaving capacity during the winter heating period, making it difficult to accommodate new energy, and the problems of abandoning wind, solar and water in some areas are prominent. Further tapping the deep peak-shaving capability of traditional coal-fired units, ...

AI Technical Summary

Problems solved by technology

[0012] In order to solve the problems existing in the prior art, the object of the present invention is to provide a flexible peak-shaving system and method for supercritical boilers, so as to overcome the problem that the supercritical boilers are operated at ultra-low loads and have higher loads in the wet state

Images