Circulating fluidized bed boiler unit for high efficiency combustion of biomass and recovery of waste heat

Abstract

The invention relates to a circulating fluidized bed boiler unit for high efficiency combustion of biomass and recovery of waste heat. The circulating fluidized bed boiler unit comprises a hearth, a tail flue and a secondary air distribution system and is characterized in that the tail flue is provided with three tandem parallel channels, i.e., a first tail flue, a second tail flue and a third tail flue , an inlet of the first tail flue is connected with a horizontal flue outlet of a cyclone separator, the outlet steers 180 DEG and is then connected with an inlet of the second tail flue, an outlet of the second tail flue steers 180 DEG and is then connected with an inlet of the third tail flue, a heating surface is arranged in the tail flue, a coarse-pitch tipping-tube medium-temperature superheater is arranged in the first tail flue, the secondary air distribution system is an air distribution structure with upper-lower and horizontally left-right staggered junction formed by air distribution units staggerly arranged at the lower part, the waist part and the central part of the front and rear walls of the hearth, and the air distribution structure enables multiple layers of secondary air jet to be mutually crosswise sprayed into the hearth in a height direction and a horizontal direction. The boiler unit provided by the invention has high combustion efficiency, discharges a small amount of CO, reduces fly ash content in flue gas and guarantees that main steam parameters accord with design requirements.

Description

technical field [0001] The invention relates to the field of boilers, and mainly relates to biomass fuel, waste heat recovery and circulating fluidized bed boiler devices. Background technique [0002] With the gradual depletion of non-renewable energy resources and the heavy pressure on the ecological environment, people are paying more and more attention to renewable clean energy. Biomass energy is a part of renewable energy, the fourth largest energy in the world, and has become an important research object in renewable energy. [0003] Biomass energy is an internationally recognized clean energy. The development of biomass energy has far-reaching social significance and broad market prospects for our country. In terms of our country's basic national conditions and the level of biomass utilization and development, biomass direct combustion technology is undoubtedly the most convenient. One of the feasible and efficient ways to use biomass energy. [0004] However, bioma...

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Problems solved by technology

[0007]However, due to the particularity of biomass fuel, conventional circulating fluidized bed boilers cannot well overcome high-efficiency combustion of fuel, high and low temperature corrosion of heat exchange surfaces, and dust accumulation. and clogging, etc., cannot effectively guarantee the safe and continuous operation of the boiler

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