Low-nitrogen efficient energy-saving high temperature and high pressure circulating fluidized bed boiler

Abstract

The invention belongs to the field of boiler plant and specifically relates to a low-nitrogen efficient energy-saving high temperature and high pressure circulating fluidized bed boiler. The boiler can effectively reduce the generating volume of pollutant gas, can reduce the energy consumption, can increase the boiler efficiency and is stable and reliable in running. A coal feeding system and a first-secondary air system are arranged at the lower end of a hearth; a separation system is communicated with the upper end of the hearth; the separation system comprises a separator inlet flue and a cyclone separator; an in-furnace ammonia spraying denitration system is arranged between the hearth and the cyclone separator; the separator inlet flue is communicated with the hearth; a tail flue is communicated with an upper end inlet of the cyclone separator; a feedback system is arranged between the lower outlet of the cyclone separator and the lower end of the hearth; a super-heater unit, a coal economizer and a pre-heater are arranged in the tail flue; an outlet flue is connected with the tail flue; the first-secondary air system comprises a first air system and a secondary air system; the first air system comprises a first air feeding structure and a zone air distributing structure; the first-secondary air system has a double-layer structure of upper layer and lower layer; the ratio of first air to secondary air is 1:1.

Description

technical field [0001] The invention belongs to the field of boiler equipment, and in particular relates to a low-nitrogen, high-efficiency and energy-saving high-temperature and high-pressure circulating fluidized bed boiler. Background technique [0002] Coal is the main energy source in my country, and its main utilization method is coal-fired power generation. The N0 produced by coal combustion x , S0 2 and soot and other pollutants seriously pollute the atmosphere, and N0 x , S0 2 It is the main source 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, to control the N0 in the flue gas from the source x , S0 2 And the emission of smoke and dust is imminent. [0003] Circulating fluidized bed combustion technology has been greatly developed in the past 30 years due to its advantages in ...

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Problems solved by technology

[0004] For the existing circulating fluidized bed units in China, due to factors such as large changes in coal types and unreasonable adjustment of primary and secondary air ratios, many power plants have CFB boilers with N0 x If the emission concentration exceeds 300mg / m3, SNCR+SCR denitrification system needs to be installed, which will significantly increase the operating cost of the enterprise and the transformation period will be long, and the initial investment in equipment will be huge

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