Low-load stable-combustion direct-current combustor

Abstract

A low-load stable-combustion direct-current combustor comprises a natural gas pipeline. The natural gas pipeline extends to a central air duct to supply natural gas, a cyclone arranged at the outlet of the central air duct conveys mixed gas to a precombustion chamber for combustion, a primary air pipe providing primary pulverized coal to the precombustion chamber is arranged outside the central air duct, an internal secondary blowdryer providing internal secondary air to the precombustion chamber is arranged outside the primary air pipe, an external secondary blowdryer providing external secondary air to the precombustion chamber is arranged outside the internal secondary blowdryer, the precombustion chamber is divided into an expansion section and a horizontal section along the inlet direction of the mixed gas, an internal-secondary-air annular nozzle is arranged in the intersection of the expansion section and the horizontal section, the internal secondary air is in annular direct-current incidence from the internal-secondary-air annular nozzle, combustion supporting function is achieved, slag build-up and pulverized-coal accumulation can be avoided; the external secondary air is injected in a direct-current oblique manner to supplement air needed for subsequent combustion of pulverized coal flow, and meanwhile, formation of NOx is reduced. By the arrangement, low-load stable combustion of a pulverized-coal combustor can be realized, and deep participation in peak regulating of a coal-fired power plant is favorably improved.

Description

technical field [0001] The invention belongs to the technical field of pulverized coal burners, and in particular relates to a low-load stable combustion straight-line burner. Background technique [0002] With the vigorous development of new energy, its proportion in the power grid is gradually expanding, resulting in the abandonment of wind, light and water in many places. Since 2010, the problem of wind curtailment has intensified, and the national average wind curtailment rate has been higher than 10% for a long time. In 2015, this figure climbed to 15%, up 7 percentage points from the previous year. The problem of wind curtailment in the "Three North" regions is particularly severe. In 2015, the wind curtailment rate in Jilin, Gansu, Xinjiang and other places exceeded 30%. Especially after the winter of 2015, some wind power projects in Gansu, Ningxia, Heilongjiang and other places had wind power abandonment rates as high as 60%. [0003] In order to implement the de...

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Problems solved by technology

Although the above measures can play a certain role, it is difficult to achieve stable combustion under lower loads, especially for loads below 30%, it is basically impossible to achieve

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