Double fluidized bed low-carbon combustion and gasification heat and electricity polygeneration device and method

Abstract

The invention discloses a dual-fluidized bed low-carbon combustion and gasified heat-electricity-gas poly-generation device which comprises two subsystems, namely a combustion system and a gasification system respectively, wherein the combustion system is connected with the gasification system through a circulating return system. The combustion system mainly adopts a circulating fluidized bed combustion mode, partial hot ash is subjected to circulating feeding to enter a gasifier slag section so as to provide heat needed by gasification, and the gasified upper non-slag section semicoke is returned to a circulating fluidized bed combustion chamber, so that the material balance is guaranteed, the carbon conversion rate and energy utilization efficiency are improved, the heat-electricity-gas poly-generation function is realized.

Description

technical field [0001] The invention relates to a dual-fluidized bed low-carbon combustion and gasification heat and electricity polygeneration device and method, belonging to the field of polygeneration technology. Background technique [0002] Carbon dioxide is the most important considered greenhouse gas, and energy activities are its main source of emissions. According to the fourth assessment report of the Intergovernmental Panel on Climate Change (IPCC), the concentration of CO2 in the global atmosphere increased from 0.280mL / L in 1750 to 0.379mL / L in 2005, an increase of 35%. Emissions have increased by about 80% since 1970. The report also pointed out that the increase in atmospheric CO2 concentration since the industrialization period is mainly due to the use of fossil fuels. my country's cumulative per capita CO2 emissions are very low, but the total emissions have ranked first in the world, and China's energy structure is dominated by coal. In terms of power sup...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a stable and reliable operation, easy to scale up, environmental protection and energy saving, realize material balance and increase carbon conversion rate, realize the sensible heat recovery process of chemical method, and improve the effective gas of syngas The composition ratio and cold gas efficiency increase the gasification reaction rate and reduce the carbon capture economy. The dual fluidized bed low-carbon combustion and gasification heat and electricity polygeneration device and method solve the current circulating fluidized bed-pyrolysis multiple Cogeneration technology has the problem that tar is difficult to separate after pyrolysis, which leads to blockage and corrosion of pipelines and valve systems. The pyrolysis system relies too much on the heat provided by the boiler system, and the load is limited, which seriously affects the reliability and stability of the system.

Images