Wide-load gas turbine waste heat boiler denitration system

Abstract

The invention discloses a wide-load gas turbine waste heat boiler denitration system which is characterized in that a transition flue is communicated with an inlet of a waste heat boiler body through a flared flue, and a first-layer heat exchanger unit, a waste heat boiler inner bypass flue section, a second-layer heat exchanger unit and a catalyst layer are sequentially arranged in the waste heat boiler body in the flue gas flowing direction, a bypass flue section in each waste heat boiler is communicated with an outlet of a diffusion section bypass flue section, an inlet of the diffusion section bypass flue section is communicated with a flared flue, a bypass flue baffle door is arranged on the diffusion section bypass flue section, and a urea solution spray gun is inserted into a transition flue. By means of the system, the smoke temperature of the gas turbine during low-load operation can be effectively increased, and the phenomenon that a chimney emits yellow smoke is reduced.

Description

technical field [0001] The invention relates to a denitrification system, in particular to a denitrification system for a wide-load gas turbine waste heat boiler. Background technique [0002] Gas-fired power generation has the advantages of quick start and stop (about half an hour), and small exhaust pollutants. In order to optimize and adjust the energy structure and increase the share of renewable energy power generation on the grid, gas turbine power generation is of great significance to maintaining the stability of the power grid. With the enhancement of people's awareness of environmental protection, the treatment of nitrogen oxides has become particularly important. At present, in the flue gas denitrification technology, the selective catalytic reduction (SCR) denitrification process has been widely used. The phenomenon of "yellow smoke" from the chimney during the start-up process of the gas turbine has attracted attention. Studies have shown that the phenomenon o...

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Problems solved by technology

The phenomenon of "yellow smoke" from the chimney during the start-up process of the gas turbine has attracted attention. Studies have shown that the phenomenon of "yellow smoke" exists during the low-load operation of the gas turbine and the initial start-up. Medium NO 2 This is caused by high concentration, which puts higher requirements on the catalyst formulation. On the other hand, the flue gas temperature is also an important influencing factor. The flue gas temperature is lower than 300°C under low load of the gas turbine, which reduces the catalytic efficiency and affects the denitrification of the system. efficiency

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