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Biomass circulating fluidized bed oxygen-enriched combustion system and method

A circulating fluidized bed and oxygen-enriched combustion technology, which is applied in the field of circulating fluidized beds, can solve the problems of bed loss and other problems, and achieve the effects of cooling, cost reduction, low investment and operation costs

Active Publication Date: 2021-06-22
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the defect that the existing biomass circulating fluidized bed oxygen-enriched combustion easily causes bed material particle agglomeration and cohesion to cause bed loss, and to provide a Biomass Circulating Fluidized Bed Oxygen-enriched Combustion System and Method for Suppressing Bed Loss

Method used

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  • Biomass circulating fluidized bed oxygen-enriched combustion system and method

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Experimental program
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Effect test

Embodiment 1

[0039] Such as figure 1 As shown, the biomass feeding unit 1 feeds the biomass raw material (specifically, corn stalks) into the circulating fluidized bed riser 2 for oxygen-enriched combustion (the oxygen concentration is 25%-28%), and the combustion temperature is 750-770 ℃, CO in the flue gas produced 2The concentration is about 80% (dry flue gas), and the water vapor content is about 20%. The generated flue gas carries the high-temperature bed material (river sand) into the high-temperature cyclone separator 3 for gas-solid separation, and the separation efficiency is 99%. The obtained high-temperature bed material enters the external oxidation heat exchanger 4, and conducts convective heat exchange with the furnace recirculation flue gas oxidation channel in the external oxidation heat exchanger 4, and the SO 2 Oxidation catalyst (specifically Fe 2 o 3 ) to 650-700°C; the separated flue gas flows through the high-temperature superheater 5, the low-temperature superheat...

Embodiment 2

[0041] Such as figure 1 As shown, the biomass feeding unit 1 feeds the biomass raw material (specifically wood chips) into the circulating fluidized bed riser 2 for oxygen-enriched combustion (the oxygen concentration is 45%-48%), and the combustion temperature is 930-950°C , CO in the flue gas produced 2 The concentration is about 80%, and the water vapor content is about 20%. The generated flue gas carries the high-temperature bed material (specifically, river sand) into the high-temperature cyclone separator 3 for gas-solid separation, and the separation efficiency is 99%. The separated high-temperature The bed material enters the external oxidation heat exchanger 4, and conducts convective heat exchange with the furnace recirculation flue gas oxidation channel in the external oxidation heat exchanger 4, and the SO 2 Oxidation catalyst (specifically Fe 2 o 3 ) to 550-640°C; the separated flue gas flows through the high-temperature superheater 5, the low-temperature super...

Embodiment 3

[0043] Such as figure 1 As shown, the biomass feeding unit 1 feeds the biomass raw material (specifically, corn stalks) into the circulating fluidized bed riser 2 for oxygen-enriched combustion (the oxygen concentration is 40%-42%), and the combustion temperature is 820-850 ℃, CO in the flue gas produced 2 The concentration is about 80% or more (dry flue gas), and the water vapor content is about 20%; the generated flue gas carries high-temperature bed material (specifically clay) into the high-temperature cyclone separator 3 for gas-solid separation, and the separation efficiency is 99% The separated high-temperature bed material enters the external oxidation heat exchanger 4, and performs convective heat exchange with the furnace recirculation flue gas oxidation channel in the external oxidation heat exchanger 4, and the SO 2 Oxidation catalyst (specifically V 2 o 5 ) to 450-460°C; the separated flue gas flows through the high-temperature superheater 5, the low-temperatur...

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Abstract

The invention belongs to the technical field of circulating fluidized beds, and relates to a biomass circulating fluidized bed oxygen-enriched combustion system and method. The biomass circulating fluidized bed oxygen-enriched combustion system comprises a biomass feeding unit, a circulating fluidized bed lifting pipe, a high-temperature cyclone separator, an external oxidation heat exchanger, a flue gas waste heat recovery unit, a recirculation fan and a flue gas shunting unit. According to the biomass circulating fluidized bed oxygen-enriched combustion system and method, high-concentration SO2 in recycled flue gas generated by oxygen-enriched combustion is catalyzed into SO3 under the condition of no external heat supply, and KCl released in the biomass combustion process is sulfated into K2SO4 with a high melting point by using SO3, so that the reaction of KCl and SiO2 and the generation of low-melting-point potassium silicate are inhibited, and bed material particles are prevented from being agglomerated and bonded to inhibit bed layer flow losses. Meanwhile, a high-temperature circulating bed material generated by oxygen-enriched combustion is used for providing heat for catalytic oxidation of SO2 in the recycled flue gas, so that efficient catalysis of SO2 without external heat supply is achieved.

Description

technical field [0001] The invention belongs to the technical field of circulating fluidized beds, and in particular relates to a biomass circulating fluidized bed oxygen-enriched combustion system and method. Background technique [0002] In response to global warming, China has 2 The goal set on emissions is to strive to reach the peak before 2030, and strive to achieve carbon neutrality before 2060 (hereinafter referred to as the "3060" carbon goal). Carbon capture, utilization and storage (CCUS), as one of the important strategic technologies for my country's low-carbon energy development, is crucial to achieving the "3060" carbon target. Biomass energy coupled with CCUS technology can not only use "carbon-neutral" biomass to cleanly generate electricity, but also use CCUS to reduce the CO released by biomass combustion. 2 Capturing and promoting "negative carbon emissions" throughout the life cycle is an important technical approach for my country to achieve the "3060...

Claims

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Application Information

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IPC IPC(8): F23C10/08F23C10/24F23C10/22F23C10/18
CPCF23C10/08F23C10/24F23C10/22F23C10/18Y02E20/34
Inventor 徐明新陆强张平新刘子树吴亚昌
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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