A method and system for desulfurization flue gas heat exchanger rb

Abstract

The invention discloses a desulfuration gas-gas heater RB method and system. The method comprises the steps that a triggering condition of a desulfuration gas-gas heater RB is set; when the triggering condition of the desulfuration gas-gas heater RB is met, a state that a furnace is followed by a machine from a state that the machine is followed by the furnace, a desulfuration accident spray device is started, the set target load and the load dropping rate of the desulfuration gas-gas heater RB are set in a load loop of the unit coordination system, coal mills are disconnected according to the number of the running coal mills, the fuel value corresponding to the target load of the desulfuration gas-gas heater RB serves as a fuel instruction to be sent to a boiler host, and therefore non-planed stopping of a unit is avoided. Due to the fact that the new desulfuration gas-gas heater RB function is designed, synchronous, long-time and stable running is achieved between a desulfurizer and the boiler host, and the frequency of non-planed unit stopping caused by the full stop fault of a desulfuration gas-gas heater is greatly reduced. The method and system have decisive significance in guaranteeing safe unit running and reducing the number of times of non-planed unit stopping, and play an important role in protecting safety of units on the power plant side and safety of power supplying on the power grid side.

Description

Technical field [0001] The present invention relates to the field of power technology, in particular to the field of flue gas desulfurization technology in power technology, and specifically to a method and system for desulfurization flue gas heat exchanger RB. Background technique [0002] With the implementation of the “Twelfth Five-Year” emission reduction requirements of the Ministry of Environmental Protection, we will continue to promote the emission reduction of total pollutants. In order to reduce the emission of pollutants and improve the comprehensive desulfurization and denitrification efficiency of coal-fired generating units, it is required to provide desulfurization systems for coal-fired power plants. The flue bypass is completely plugged, so the desulfurization flue bypass plugging is imperative for power generation companies. At the same time this year, the Ministry of Environmental Protection and the provincial environmental protection bureaus repeatedly emphasi...

AI Technical Summary

Problems solved by technology

[0008] It can be seen from the above scheme that the essence of the existing technical scheme in China is that when the GGH shuts down due to various reasons and the flue gas temperature at the outlet of the absorption tower is high, the boiler MFT, which is the main fuel of the unit, is directly used to ensure the safety of the main engine and the furnace. Trip, shut down the unit

In addition, the main engine and the desulfurization island after the desulfurization bypass is blocked are not considered and designed as an integration, which greatly increases the number of non-stop of the unit and increases the risk of safe operation of the power plant and the power grid.

Images