Ammonia-mixed fuel thermal power generation system and method

Abstract

The invention relates to a thermal power plant carbon emission reduction technology, in particular to an ammonia-mixed fuel thermal power generation system and method. The system comprises an over fire air nozzle, secondary air nozzles and primary air nozzles which are sequentially formed in the side wall of a boiler hearth from top to bottom, an SCR reactor arranged at a tail flue of a boiler, and an ammonia supply system connected to the boiler. The ammonia supply system comprises an ammonia supply pipeline and an ammonia preparation device; the ammonia preparation device is respectively communicated with the boiler hearth and the boiler tail flue through the ammonia supply pipeline; the amount of ammonia gas introduced into the boiler hearth by the ammonia supply pipeline is 10%-30% of the thermal load of the hearth; the secondary air nozzles and the primary air nozzles are arranged at intervals along the side wall of the hearth; the bottommost secondary air nozzle is connected with the ammonia supply pipeline and an air pipeline, and the other secondary air nozzles are only connected with the air pipeline; the over fire air nozzle is connected with the air pipeline; and the primary air nozzles are arranged between the adjacent secondary air nozzles and are respectively connected with a pulverized coal pipeline and the air pipeline. According to the system, combustion is stable, the emission of nitrogen oxides and carbon is low, and the combustion efficiency of the boiler can be effectively guaranteed.

Description

Technical field [0001] The invention relates to carbon emission reduction technology for thermal power plants, specifically a mixed ammonia fuel thermal power generation system and method. Background technique [0002] In order to reduce carbon emissions, thermal power plants need to change the traditional high-carbon-emission coal-fired power generation method, strive to adapt to the development trend of "de-coalization" by innovating fuel sources and combustion methods, and create a gap between coal-fired power generation and non-fossil energy power. Achieve a reasonable balance that is conducive to controlling climate change while ensuring the security and flexibility of energy and power grids. [0003] Ammonia is a carbon-free fuel with no greenhouse gas emissions, and burning ammonia directly reduces energy losses during cracking into hydrogen. The energy density of ammonia is 22.5MJ / kg, which is equivalent to fossil fuels. However, ammonia has a high ignition point te...

AI Technical Summary

Problems solved by technology

[0004] Ammonia is mainly used as a denitrification reducing agent in thermal power plants. As a fuel, direct combustion has the challenges of low flame speed and high nitrogen oxide emissions.

Relevant studies have shown that increasing the proportion of ammonia mixed can reduce nitrogen oxide emissions, but will reduce boiler efficiency

Images