The 660 MW ultra-supercritical circulating fluidized bed (CFB) boiler, which is the maximum capacity and largest scale boiler in world has entered construction stage China. This study established a full-scale dynamic simulation model of at 100% continuous rating (BMCR) condition. consists an air-flue gas system, water-steam ash circulation system. “core-annulus” gas-solid two-phase flow structu...

A novel concept called volatiles distributor (VD), with the purpose to achieve an even distribution of over cross-section a fluidized-bed and better contact between bed materials, has been investigated. The could be useful for chemical- looping combustion, as well other solid fuel conversion processes in fluidized-beds. An experimental study VD circulating (CFB) cold-flow model was conducted un...

Based on the field test of a 600 MW supercritical circulating-fluidized bed boiler, this paper optimizes secondary air pipe layout scheme 660 ultra-supercritical circulating fluidized boiler with similar furnace structure and carried out numerical simulation its distribution uniformity. The box adopts variable section design, branch separate inlet mode. experimental results showed that oxygen c...

This is a summary of the development conversion solid fuels in fluidized bed during hundred years that follow first patent Winkler September 1922. The gasifiers and their followers are described first. Other fuel converters, such as boilers, appeared only 1960–70s became interest because expected environmental advantages. Initially, bubbling boilers were introduced, followed by circulating (CFB...

This study makes use of this distinction to analyze the exhaust gas concentration and fuel of the circulating fluidized bed (CFB) boiler that mainly uses wood biomass, and to develop the emission factors of Methane (CH(4)), Nitrous oxide (N(2)O). The fuels used as energy sources in the subject working sites are Wood Chip Fuel (WCF), RDF and Refused Plastic Fuel (RPF) of which heating values are...

As a clean fuel combustion technology, the circulating fluidized bed (CFB) has been developed rapidly in recent years, but one of its disadvantages is high N2O emissions. With implementation increasingly strict pollution control standards, decomposition and removal technologies have become main focus current research. This paper reviews latest research on noble metals, metal oxides, molecular s...

In order to study the migration and transformation of SO 3 from circulating fluidized bed boiler (CFB) in air preheater flue gas treatment facilities, 10 boilers with installed capacities between 150 MW 330 were measured by controlled condensation method. Ten ranging using It is showed that removal rate was affected exit temperature, which ranged 6.7 % 36.5 %, rotary higher than tubular preheat...

The fluid dynamics in the furnaces of large-scale circulating fluidized bed (CFB) boilers are surprisingly little known contrast to many laboratory studies made on conditions related chemical reactors. Two areas surveyed present work: bottom and upper dilute zone a furnace. is considered bubbling, but general opinion that either it does not exist, or turbulent. flow furnace phase transport, jud...

The connection section between cyclones and backpass is an important configuration in multi-cyclone circulating fluidized bed boilers (CFB). In this work, the resistance coefficient of different modes, distribution from each cyclone outlet to (connection branch) one mode are defined calculated, order investigate their effects on furnace solids suspension density circulation rates. Three modes w...

In this paper, combustion of char in the riser of circulating fluidized bed was modeled using ASPEN PLUS. Since physical and chemical phenomena are involved in the process, the model integrates the two-phase hydrodynamic sub-model with the reaction sub-model derived from the literature. In the proposed model, the fluidized bed is divided into several sections and the behavior of each section wa...