Material separator for circulating fluidized bed boiler

Abstract

The invention discloses a material separator for a circulating fluidized bed boiler. The material separator is characterized in that: the lower end of a fume guide film-type screen which can be bent over is branched into two front rows of light tube bundles and two back rows of light tube bundles, wherein the two front rows of light tube bundles and the two back rows of light tube bundles are bridged above a storage bin and form a fume inlet and a fume outlet of a turning channel respectively; and the lower ends of the two front rows of light tube bundles and the two back rows of light tube bundles are communicated with a middle transverse collecting box of the boiler. The invention also discloses another material separator for the circulating fluidized bed boiler. The other material separator is characterized in that: the lower end of the fume guide film-type screen which can be bent over is branched into a front row of tube bundles and a back row of tube bundles, wherein the front row of tube bundles and the back row of tube bundles are positioned on the turning channel. The material separator has the advantages of advanced process, simple manufacturing and installation, wide application range, energy conservation, consumption reduction and remarkable emission reduction.

Description

technical field [0001] The invention relates to a core component of a circulating fluidized bed boiler - a material separator. The material separation of a circulating fluidized bed boiler does not require any special devices and separation elements. The inertial gravity separator formed naturally by the heating surface space of the body. In particular, it involves improving the structural design of material separators of various circulating fluidized bed boilers at present, and the transformation of energy saving and emission reduction of traditional circulating fluidized bed boilers and layer fired chain boilers in use. Background technique [0002] Circulating fluidized bed boiler combustion technology is widely recognized as a "clean" combustion technology with the most development prospects due to its advantages such as wide fuel adaptability, high combustion efficiency, low nitrogen oxide emissions, high-efficiency desulfurization, and good load regulation performance....

AI Technical Summary

Problems solved by technology

[0004] At present, the circulating fluidized bed separator with the highest share in the international and domestic markets is the cyclone separator. Its typical structure is a high-temperature cyclone separator made of refractory materials. Its main advantage is high separation efficiency, and its main disadvantage is its bulky size. , The tangential inlet of the separator has high wind speed and large resistance, high power consumption of the induced draft fan, and the gas-solid two-phase reverse high-speed flow towards the silo entrains a large amount of fly ash, and the original emission concentration of smoke and dust is high. The separator needs to be lined and External thermal insulation, using a large amount of wear-resistant and high-temperature resistant materials, not only increases the cost of raw materials and manufacturing and installation of the separator, but also has a large thermal inertia, which is easy to coke at high temperature, and the boiler starts and stops slowly

Some boilers use water-cooled or steam-cooled cyclone separators. Although the wear-resistant and high-temperature resistant materials are reduced, the problem of large thermal inertia is solved, the boiler does not coke, and the start and stop are fast, but there are also high wind speeds, large resistance, and induced draft fans. The disadvantage of high power consumption, coupled with its complicated manufacturing process, leads to high prices, and customers are not easy to accept the low market share

[0005] Although the material separation in the circulating fluidized bed boiler disclosed in the invention patent with the application number of 200910308160.1 has many advantages compared with the popular circulating fluidized bed boiler material separation in the market, such as low flow resistance and saving the power consumption of the induced draft fan, The membrane water wall structure saves high temperature and wear-resistant materials, etc., but there are still many defects in its structure, which limits its application range. For example, the entrance and exit of the turning channel are unimpeded. The poor inertial separation performance affects the inertial separation efficiency. The second is that the gas-solid two-phase enters the turning channel to expand the capacity and the deceleration differential speed is small, which affects the gravity settlement efficiency. The quality life and increase the steel consumption of the non-heating surface are not conducive to anti-coking; the fourth is that the application range of this structure is small, and it is more suitable for fluidized bed boilers <35 steam tons; the fifth is to ensure the separation efficiency of materials and its auxiliary combustion chamber and burnout chamber The flow rate is suitable for <3m / s, so that the volume of the boiler will increase

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