A double fluidized bed gas-solid combustion device and method

A combustion device and dual fluidized bed technology, applied in the field of dual fluidized bed gas-solid combustion devices, can solve problems such as difficulty in controlling the amount of material circulation, difficulty in adapting to changes in fuel types, etc., achieving good fuel adaptability, low transfer resistance, Efficient use effect

Active Publication Date: 2016-01-06
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Technical problem: In view of the shortcomings of the existing dual fluidized bed combustion technology that it is difficult to adapt to the change of fuel types and the amount of material circulation between reactors is difficult to control when the circulating material changes, the purpose of the present invention is to provide a simple structure, convenient control and Double fluidized bed gas-solid combustion device and method applicable to various gases and solid fuels

Method used

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  • A double fluidized bed gas-solid combustion device and method
  • A double fluidized bed gas-solid combustion device and method
  • A double fluidized bed gas-solid combustion device and method

Examples

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Embodiment 1

[0036] The fuel is coal and natural gas (the main component is CH4), and the circulating bed material is iron ore. The oxidation state of the oxygen carrier contained in it mainly exists in the form of Fe2O3, and the reduced state mainly exists in the form of Fe3O4, FeO and Fe. Since the reaction rate of the oxidized oxygen carrier, coal powder, and natural gas is relatively fast under the design working conditions of the reduction reactor, by closing the valve provided on the overflow device 6 of the reduction reactor to make it run as a fast fluidized bed, the reduction reaction The superficial gas velocity in the reactor is set to 3.5-4m / s, and the superficial gas velocity in the oxidation reactor is set to 4-4.5m / s. The fluidization air volume distribution of the reduction reactor is 5% to 15% of the second nozzle, 45% to 55% of the first nozzle, and 35% to 45% of the fluidization air inlet at the bottom, and the fluidization air volume of the oxidation reactor is allocated...

Embodiment 2

[0042] The same device as in Example 1 was used, the fuel was a mixture of coal and biomass, and nickel-based oxygen carrier (NiO) was selected. Since the reaction rate between the oxidized oxygen carrier (NiO) and the mixed fuel is relatively slow under the design working conditions of the reduction reactor, it can be fluidized as bubbling by opening the valve set on the overflow device 6 of the reduction reactor. bed operation, the superficial gas velocity in the reduction reactor is set to 0.4-0.6m / s, and the superficial gas velocity in the oxidation reactor is set to 4-4.5m / s. The fluidization air volume distribution of the reduction reactor is 5% to 15% of the second nozzle, 45% to 55% of the first nozzle, and 35% to 45% of the fluidization air inlet at the bottom, and the fluidization air volume distribution of the oxidation reactor is the third nozzle 15% to 25%, the fourth nozzle 35% to 45%, and the bottom fluidization air inlet 35% to 45%.

[0043] The mixed fuel is ...

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Abstract

The invention discloses a gas-solid combustion device and method of a double-fluidized-bed. According to the device and the method, a solid fuel and a gas fuel are added into a reduction reactor respectively and then react with an oxidation state oxygen carrier to generate a gas product and a reduction state oxygen carrier which are composed of CO2 and water vapor; and CO2 can be enriched and captured after gas-solid separation and smoke condensing are carried out. The reduction state oxygen carrier is fed into an oxidation reactor and oxidized into the oxidation state oxygen carrier, then returns to the reduction reactor to participate in the reaction. The reduction reactor of the device is good in adaptability to various types of fuels and oxygen carriers; through the device, a classification fluidization method is introduced, mixing of materials in the device is reinforced and the reaction efficiency of the device is improved; through the special design of a material returning structure at the bottom of the device, resistance of circulation material flowing from the oxidation reactor to the reduction reactor can be reduced; and material circulation in a large amount can be realized in a controllable manner.

Description

technical field [0001] The invention relates to the field of clean combustion and high-efficiency utilization of fuels, in particular to a dual-fluidized bed gas-solid combustion device and method, suitable for solid fuels including coal and biomass and gas fuels including natural gas and coal gasification synthesis gas combustion applications. Background technique [0002] With the rapid development of society, my country's energy consumption has grown rapidly in recent years. According to the National Bureau of Statistics, my country's total energy consumption in 2012 has reached 3.62 billion tons of standard coal, followed by increasingly prominent problems in energy supply and environmental pollution. As one of the important countermeasures, new energy and clean energy technologies have been proposed more and more and have gradually been widely used. [0003] Dual fluidized bed combustion technology is a clean and efficient combustion technology with outstanding applic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C1/04F23C10/00F23C10/20F23C10/28
Inventor 耿察民钟文琪金保昇邵应娟陈岱琳
Owner SOUTHEAST UNIV
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