Low-nitrogen combustion circulating fluidized bed boiler

Abstract

The invention discloses a low-nitrogen combustion circulating fluidized bed boiler. The low-nitrogen combustion circulating fluidized bed boiler comprises a hearth, a secondary air system, a primary air system, a separation system, a material returning system, a tail flue and a coal dropping system, wherein the secondary air system and the primary air system are arranged on the lower portion of the hearth and arranged up and down; the separation system is arranged on the upper portion of the hearth; the material returning system communicates with the lower portion of the separation system and the lower portion of the hearth; the tail flue communicates with the upper portion of the separation system; and the coal dropping system communicates with the lower portion of the hearth. The primary air system comprises a hearth air distributing plate, a primary air inlet pipe and a plurality of low-nitrogen air caps, wherein the hearth air distributing plate is arranged at the lower end of the hearth, the primary air inlet pipe communicates with the hearth air distributing plate, and the multiple low-nitrogen air caps are uniformly arranged on the hearth air distributing plate and achieve the effect that a primary air combustion area reaches a fuel-rich state. The secondary air system comprises upper secondary air inlet pipes and lower secondary air inlet pipes which are arranged up and down. The upper secondary air inlet pipes and the lower secondary air inlet pipes are all uniformly arranged in the length direction of the hearth, and air outlets of the upper secondary air inlet pipes and air outlets of the lower secondary air inlet pipes face the lower stream of the primary air combustion area. According to the low-nitrogen combustion circulating fluidized bed boiler provided by the invention, generation of nitrogen oxides can be reduced, and energy saving and emission reduction are achieved.

Description

technical field [0001] The invention relates to the field of boiler equipment, in particular to a low-nitrogen combustion circulating fluidized bed boiler. Background technique [0002] Coal is the main energy source in my country, and its main utilization method is combustion to generate electricity. Pollutants such as nitrogen oxides, sulfur dioxide, and soot produced by coal combustion seriously pollute the atmosphere, and nitrogen oxides and sulfur dioxide are the main sources of pollution such as acid rain and photochemical smog. . With the rapid development of my country's economy, the discharge of pollutants has become more and more serious, which has brought great troubles to people's lives. Therefore, it is imminent to control the emission of nitrogen oxides, sulfur dioxide and soot in the flue gas from the source. [0003] Circulating fluidized bed combustion technology has been greatly developed in the past 30 years due to its advantages in energy saving and envi...

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Problems solved by technology

[0004] Existing circulating fluidized bed units in China have a high concentration of nitrogen oxide emissions, and need to install SNCR+SCR denitrification system, which will significantly increase the operating cost of the enterprise, and the transformation period is long, and the initial investment in equipment is huge

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