Connection between cyclone separators and hearth of large-scale circulating fluidized bed boiler

Abstract

The invention discloses connection between cyclone separators and a hearth of a large-scale circulating fluidized bed boiler. The hearth is connected with six cyclone separators. A cross section of the hearth is rectangular, wherein upper portions of two wider side walls of the hearth are provided with three flue gas outlets respectively. The six cyclone separators are divided into two sets equally and are fixedly connected with the two wider side walls. Each flue gas outlet is communicated with an inlet flue of the cyclone separator. Cylindrical shell structure and dimension of the six cyclone separator are same. In the two set of cyclone separators on the two side walls, inlet flue cross section of each cyclone separator of each set and inlet flue cross section of each cyclone separator of the other set form central symmetry relative to a central point of the hearth. Inlet flue cross sections of two outboard cyclone separators of the sets form axial symmetry relative to a center line of the hearth. According to the connection provided in the invention, flow of flue gas in the hearth is distributed uniformly, flue gas flux of each cyclone separator is distributed uniformly, particle concentration of a vertical cross section of the inlet flue is in reasonable distribution, thus performance consistency of each cyclone separator is ensured.

Description

technical field [0001] The invention relates to the technical field of circulating fluidized bed boilers, in particular to a gas-solid separation device for circulating fluidized bed boilers. Background technique [0002] The cyclone separator is one of the important components of the circulating fluidized bed boiler. Its main function is to separate a large amount of high-temperature solid materials that leave the furnace with the flue gas from the flue gas, and send them back to the furnace through the feeder to maintain the circulating flow of the furnace. In the desulfurized state, the fuel is combusted repeatedly and the desulfurizer reacts repeatedly to achieve the ideal combustion efficiency and desulfurization efficiency. The separation performance of the cyclone separator directly affects the performance of the entire circulating fluidized bed boiler. [0003] At present, circulating fluidized bed boiler technology is developing towards large-scale and high-paramet...

AI Technical Summary

Problems solved by technology

The importance of this relationship is even more pronounced and complicated when large size furnaces are connected in parallel with multiple cyclones

[0006] For the above problems, one of the disclosed solutions is to install deflectors at the inlet to improve the impact on the performance of the cyclone separator, but to set guide vanes in the outlet with a height of 6 meters and a width of 4 meters. It is difficult to realize; the second disclosed solution is to set a vertical partition wall in the furnace to divide the space of the furnace, so as to avoid the influence of the layout of the furnace outlet on the symmetry of the flue gas flow in the furnace, but this structure destroys The large-scale flue gas mixing in the furnace is eliminated, and the problems of anti-wear and suspension of the partition wall are very difficult to solve; the third disclosed solution is to arrange an even number of cyclone separators on each side of the furnace. For fluidized bed boilers, four cyclone separators need to be arranged on the left and right side walls of the furnace, but the horizontal space occupied by the four cyclone separators arranged side by side greatly exceeds the horizontal space provided by the width of the furnace. The method of cyclone separator diameter solves the layout problem, but the performance of the cyclone separator will be greatly reduced

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