Reinforced desulphurization method and reinforced desulphurization system of desulphurizer for combustion system of circulating fluidized bed

A circulating fluidized bed and combustion system technology, which is applied to fluidized bed combustion equipment, combustion methods, and fuels burned in a molten state, can solve problems such as low desulfurization efficiency and low utilization efficiency of desulfurizers, reduce system complexity, and improve efficiency. Conducive to the effect of large-scale and low-pollution

Active Publication Date: 2013-12-18
ZHEJIANG UNIV
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Problems solved by technology

[0005] The present invention overcomes the shortcomings of low desulfurization efficiency and desulfurization agent utilization efficiency in the process of desulfurization in the traditional circulating fluidized bed furnace, and proposes a desulfurization agent-enhanced desulfurization application system and method for a circulating fluidized bed combu

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  • Reinforced desulphurization method and reinforced desulphurization system of desulphurizer for combustion system of circulating fluidized bed

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Embodiment Construction

[0020] Referring to the attached picture:

[0021] A method for strengthening desulfurization by a desulfurizer in a circulating fluidized bed combustion system, comprising the following steps:

[0022] Step 1, the desulfurizer absorbs SO in the flue gas in the combustion chamber (3) 2 ;

[0023] Step 2, circulating ash separation: the unreacted CaO in the circulating ash is carried by the flue gas into the gas-solid separator (4) for circulating ash separation;

[0024] Step 3, distribution of circulating ash: After separation, the circulating ash falls into the feeder (6), a part of the circulating ash in the feeder (6) is directly sent back to the combustion chamber, and the other part enters the activation regeneration chamber (8);

[0025] Step 4, recycling ash regeneration, pass water vapor and carbon dioxide gas into the activation regeneration chamber (8), activate the unreacted CaO in the recycling ash, and generate Ca(OH) 2 , while passing a high concentration of ...

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Abstract

The invention discloses a reinforced desulphurization method and a reinforced desulphurization system of a desulphurizer for the combustion system of a circulating fluidized bed, relating to efficient utilization for the desulphurizer and increase for desulphurization efficiency during the combustion process of the solid fuel of the circulating fluidized bed. The reinforced desulphurization system comprises a combustion chamber, a gas-solid separation device, a vertical tube, a material return device, a mechanical control valve, an activation and regeneration chamber, a vapour inlet and a high-concentration CO2 inlet. The reinforced desulphurization method and the reinforced desulphurization system disclosed by the invention have the main characteristic that unreacted CaO in circulating ash during the combustion and desulphurization process of the circulating fluidized bed is activated by vapour and carbonated with high-concentration CO2 to generate CaCO3, CaCO3 is returned to a hearth and performs a sulphation reaction by virtue of the principle that a CaCO3 surface structure which is calcined/carbonated for times is more beneficial to the sulphation reaction, so that increase of the utilization efficiency and the desulphurization efficiency of the desulphurizer are contributed.

Description

technical field [0001] The invention relates to a method and system for using a desulfurizer to strengthen desulfurization in the combustion process of a fluidized bed solid fuel, in particular to a method for improving the use efficiency of the desulfurizer and the desulfurization efficiency in the combustion process of a circulating fluidized bed. Background technique [0002] Circulating fluidized bed combustion is a clean coal combustion utilization method. Since the furnace combustion temperature is between 800 and 900 °C, the desulfurization reaction efficiency is high in this temperature range. Adding desulfurizer particles with appropriate particle size range in the furnace can realize SO while burning in the furnace. 2 Removal is simpler than conventional pulverized coal boiler tail flue gas desulfurization (FGD), and the investment cost and operation and maintenance cost are lower. In order to improve the desulfurization efficiency in the circulating fluidized bed...

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Application Information

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IPC IPC(8): B01D53/83B01D53/96B01D53/50F23C10/10
Inventor 程乐鸣王勤辉方梦祥蔡毅余春江施正伦肖刚王涛郑成航周劲松王树荣高翔骆仲泱倪明江岑可法
Owner ZHEJIANG UNIV
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