Gas turbine system based on main combustion area ammonia injection denitration and denitration method thereof

Abstract

The invention relates to a gas turbine flue gas denitration technology, in particular to a gas turbine system based on main combustion area ammonia injection denitration and a denitration method thereof. The gas turbine system comprises a combustion chamber, an ammonia gas supply device, a gas compressor, a turbine and a generator, wherein the ammonia gas supply device and the gas compressor are connected to the combustion chamber, and the turbine and the generator are connected to an outlet of the combustion chamber; the interior of the combustion chamber is sequentially divided into a combustion chamber head, a main combustion area, an afterburning area and a mixing area from front to back; a combustor is arranged at an inlet of the combustion chamber head; the combustor is further connected with a natural gas pipeline; an ammonia spraying nozzle is formed in the inner wall of the combustion chamber where the main combustion area is located; an afterburning air nozzle is formed in the inner wall of the combustion chamber where the afterburning area is located; a mixing hole is formed in the inner wall of the combustion chamber where the mixing area is located; a gas inlet of the ammonia gas supply device is connected with an exhaust gas outlet of the turbine, and a gas outlet of the ammonia gas supply device is connected with the ammonia spraying nozzle; and an outlet of the gas compressor is connected with the combustor, the afterburning air nozzle and the mixing hole through a high-temperature high-pressure air pipeline.

Description

technical field [0001] The invention relates to gas turbine flue gas denitration technology, in particular to a gas turbine system based on ammonia injection denitration in a main combustion zone and a denitration method thereof. Background technique [0002] Gas-fired power generation is characterized by cleanliness and high efficiency. In recent years, the installed capacity of gas-turbine power plants in my country has continued to expand, which has effectively promoted the transformation of my country's energy structure. Due to the technological characteristics of high combustion temperature and large excess air coefficient, gas turbine power plants produce a large amount of nitrogen oxides during the production process. Nitrogen oxides are one of the main causes of air pollution, photochemical smog, and acid rain. In recent years, my country's requirements for the emission limits of nitrogen oxides in the power generation industry have become more and more stringent. A...

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Problems solved by technology

Among them, the combustion process control is mainly to reduce the production of nitrogen oxides by reducing the combustion temperature or the residence time of natural gas in high-temperature areas, including water injection / steam injection technology in the combustion chamber, catalytic combustion technology, dry low-nitrogen combustion technology, etc. However, at present, the above technologies are mainly mastered by gas turbine main engine manufacturers; and the Selective Catalytic Reduction (SCR) technology is currently the most widely used and most effective flue gas denitrification technology, which can achieve a denitrification efficiency of more than 90%, but its initial investment and operation Higher cost and ammonia slip

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