Dual-fuel combustor with graded ignition, graded air distribution and flue gas recirculation, and boiler

Abstract

The invention provides a dual-fuel combustor with graded ignition, graded air distribution and flue gas recirculation, and a boiler. The dual-fuel combustor with graded ignition, graded air distribution and flue gas recirculation comprise an ignition gas pipe, a central air pipe, a primary air chamber, a secondary air chamber, a main combustion chamber, a pre-combustion chamber, an ignition gun and a circulating air chamber, wherein the central air pipe sleeves outside the ignition gas pipe; the primary air chamber sleeves outside the central air pipe; the secondary air chamber sleeves outsidethe primary air chamber; the main combustion chamber sleeves outside the secondary air chamber; air outlets of the central air pipe, the primary air chamber and the secondary air chamber, and gas outlets of the ignition gas pipe and the main combustion chamber are located in the pre-combustion chamber; the ignition gun is installed on the pre-combustion chamber; and the circulating air chamber isarranged outside the pre-combustion chamber. The problems that an existing dual-fuel combustor is not ideal in low-nitrogen combustion effect, poor in operation safety and the like are solved, and the purposes of improving the combustion efficiency and reducing NOX initial emission are achieved.

Description

technical field [0001] The invention belongs to the technical field of burners, and in particular relates to a dual-fuel burner and boiler with staged ignition, staged air distribution and flue gas recirculation. Background technique [0002] In view of my country's existing coal-based energy structure and the continuous improvement of national energy conservation and emission reduction standards, especially in recent years, with the country's commitment to international energy cooperation and introduction, the supply of high-quality fuels such as natural gas has also been greatly eased, so the new Low-nitrogen and high-efficiency pulverized coal and gas combustion technologies have been vigorously promoted and applied. [0003] Industrial boilers have always played an important role in my country's economic operation. At present, the international situation is changing day by day, the surrounding environment is not stable, and the problem of energy security still exists. S...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a dual-fuel burner and boiler with staged ignition, staged air distribution and flue gas recirculation, which is used to solve the problems of unsatisfactory low-nitrogen combustion effect and poor operation safety of the current dual-fuel burner.

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