Device and process for preparing O2-CO2 mixed gas based on chemical-looping technology

A technology of O2-CO2 and mixed gas, which is applied in the direction of oxygen preparation, carbon compounds, inorganic chemistry, etc., can solve the problems of complex operation, high energy consumption, low efficiency, etc., achieve high heat and mass transfer efficiency, improve production efficiency, cost reduction effect

Inactive Publication Date: 2014-01-08
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Air separation is currently the most important oxygen separation technology, mainly including cryogenic rectification, pressure swing adsorption and membrane separation technology: (1) cryogenic rectification technology is the most common and mature technology for air separation to produce oxygen. It has a long history. The main principle is to use the different boiling points of nitrogen and oxygen in the air. After the air is liquefied, low-temperature rectification is carried out to achieve the purpose of separating nitrogen and oxygen. The obtained products have high purity, high output and many types. High, high energy consumption, and complicated operation; (2) Oxygen production by pressure swing adsorption is an emerging oxygen production technology in the past 30 years. This method has quick start-up, simple operation, automation, and simple equipment manufacturing, but it has low production capacity (3) Membrane separation technology is easy to operate and can be carried out under normal temperature and pressure, but there are problems such as difficult preparation of membrane materials and high cost
In summary, the current separation of oxygen to produce O 2 -CO 2 There are problems such as low efficiency, high energy consumption, and complicated operation in the device and process of using mixed gas for oxygen-enriched combustion

Method used

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  • Device and process for preparing O2-CO2 mixed gas based on chemical-looping technology

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Experimental program
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Effect test

Embodiment 1

[0031] The oxygen carrier particles used are CuO / TiO prepared by spray drying method 2 Particles, in which the mass fraction of CuO is 60%, the particle size of the particles is 100μm~150μm, and the feed rate of the oxygen carrier is 100g / min, the recycled flue gas introduced into the fluidized bed reactor from the oxygen-enriched burner The flow rate is 5 L / min, the reaction temperature in the fluidized bed reactor is 1000~1200℃, and the operating pressure is 0.1~0.2MPa. O was measured at the outlet of the fluidized bed reactor 2 -CO 2 O in the mixed gas 2 The content is 31.4%. The reaction temperature of the bubbling bed reactor is 600~700°C, the air flow rate input from the gas inlet of the bubbling bed reactor is 1L / min, and the operating pressure is 0.1MPa.

Embodiment 2

[0033] The oxygen carrier particle used is Mn 2 o 3 and Co 2 o 3 Composite oxygen carrier, where Mn 2 o 3 The mass fraction is 50%, Co 2 o 3 The quality fraction is 50%. The particle size of the particles is 200μm~300μm, the feed rate of the oxygen carrier is 200g / min, the flow rate of the recirculated flue gas introduced from the oxygen-enriched burner into the fluidized bed reactor is 5 L / min, and the fluidized bed The reaction temperature in the reactor is 750~850℃, and the operating pressure is 0.1~0.2MPa. O was measured at the outlet of the fluidized bed reactor 2 -CO 2 O in the mixed gas 2 The content is 21.9%. The reaction temperature of the bubble bed reactor is 400~500°C, the air flow rate input from the gas inlet of the bubble bed reactor is 1L / min, and the operating pressure is 0.1MPa.

Embodiment 3

[0035] The oxygen carrier used is PbO 2 Particles, the particle size of the particles is 450 μm~500 μm, the feed rate of the oxygen carrier is 500 g / min, and the flow rate of the recirculated flue gas introduced from the oxygen-enriched burner into the fluidized bed reactor is 5 L / min. The reaction temperature in the bed reactor is 300~350℃, and the operating pressure is 0.1~0.2MPa. O was measured at the outlet of the fluidized bed reactor 2 -CO 2 O in the mixed gas 2 The content is 7.2%. The reaction temperature of the bubbling bed reactor is 300~350°C, the air flow rate input from the gas inlet of the bubbling bed reactor is 1L / min, and the operating pressure is 0.1MPa.

[0036] The present invention and existing preparation O 2 -CO 2 Compared with the mixed gas process, the recirculated flue gas is used to directly produce O 2 -CO 2 The mixed gas simplifies the two-step process of first producing oxygen and then mixing in cryogenic air separation and other processes...

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Abstract

The invention discloses a device and process for preparing O2-CO2 mixed gas based on a chemical-looping technology. The device comprises a fast fluidized bed reactor, a first air distribution plate, a distribution plate, a first cyclone separator, a first returning mechanism, a bubbling bed reactor, a second air distribution plate, a second cyclone separator, a second returning mechanism and an oxygen-enriched combustion device. The process comprises the steps of releasing oxygen in the fluidized bed reactor by using oxygen-carrying particles; separating the O2-CO2 mixed gas from the oxygen-carrying particles by using the first cyclone separator; adding the oxygen-carrying particles into the bubbling bed reactor for regeneration by using the first returning mechanism; separating the regenerated oxygen-carrying particles from oxygen-depleted gas by using the second cyclone separator; conveying the oxygen-carrying particles to the fluidized bed reactor by using the second returning mechanism to form a circulating system. The device and the process can realize continuous preparation of the O2-CO2 and has the advantages of stable operation, simple process and capability of performing continuous and high-efficiency production.

Description

technical field [0001] The invention belongs to the technical field of chemical chain technology and mixed gas preparation, in particular to a method for preparing O gas based on chemical chain technology. 2 -CO 2 The device and process of mixed gas. Background technique [0002] CO produced when using fossil fuels 2 It is the most important source of greenhouse gases, causing global climate deterioration and ecological damage, reducing CO emissions 2 It has become a research hotspot in the world today. Carbon capture and storage technology is considered to reduce atmospheric CO 2 One of the effective means of concentration, the current CO 2 The capture mainly adopts three technologies: pre-combustion capture, oxygen-enriched combustion, and post-combustion separation, of which oxygen-enriched combustion uses O 2 -CO 2 Mixed gas cycle combustion is a very potential CO 2 capture technology. my country is a country dominated by coal power generation, O 2 -CO 2 Mixed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B13/02C01B31/20C01B32/50
Inventor 王文举王杰
Owner NANJING UNIV OF SCI & TECH
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