Circulating fluidized-bed supercharged oxygen-enriched coal combustion device, and application thereof

A circulating fluidized bed and coal combustion technology, which is applied in the direction of fluidized bed combustion equipment, fuel burned in a molten state, and combustion methods, etc., to achieve the effects of increasing residence time, improving combustion efficiency, and improving safety

Inactive Publication Date: 2017-10-10
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Technical problem: The purpose of the present invention is to provide a circulating fluidized bed pressurized oxygen-enriched coal combustion device and its application, aiming at solving pressure control, oxygen-enriched atmosphere configuration, continuous feeding / exhausting under pressure during coal pressurized combustion Realize the efficient and clean combustion of coal particles in the fluidized bed under pressurized and oxygen-enriched conditions

Method used

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  • Circulating fluidized-bed supercharged oxygen-enriched coal combustion device, and application thereof
  • Circulating fluidized-bed supercharged oxygen-enriched coal combustion device, and application thereof
  • Circulating fluidized-bed supercharged oxygen-enriched coal combustion device, and application thereof

Examples

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Effect test

Embodiment 1

[0032] Such as figure 1 , a circulating fluidized bed pressurized oxygen-enriched coal combustion device, the device includes pressure feed system I, fluidized bed combustion reaction system II, pressure slag discharge system III and pressure shell IV four parts, of which the first three The systems are all within the pressure shell IV; the pressure feeding system I is, from top to bottom, the feed inlet D, the pressure supplement gas inlet C, the pressure hopper 1, the feed valve 2, the feed rotor 3 and the feed motor 4, Feed pipe 5; wherein, the feed inlet D is set directly above the pressure hopper 1, the pressure supplement gas inlet C is set at the upper end of the pressure hopper 1, and the outlet of the pressure hopper 1 is connected with the feed rotor 3 and the feed motor through the feed valve 2 The feed control device composed of 4 is connected to the inlet, and the feed pipe 5 at the outlet end of the feed control device is connected to the fluidized bed combustion...

Embodiment 2

[0042] Same as Example 1, when the operating pressure is high, the pressure shell can bear part of the pressure, thereby reducing the compressive stress borne by the materials of systems I, II, and III. At this time, the inside of the pressure shell is no longer normal pressure, but a pressure value between atmospheric pressure and the internal pressure of the fluidized bed. For example, when the internal operating pressure of the fluidized bed is 3Mpa, the pressure shell is filled with inert gas until the pressure is 1.5Mpa, so that the internal and external pressure difference is approximately equal to 1.5Mpa no matter at the wall of the fluidized bed or the pressure shell. The principle of pressure control is that the pressure inside the pressure shell is always half of the pressure inside the fluidized bed reactor, that is, the internal pressure of the pressure shell and the internal pressure of the fluidized bed rise slowly synchronously, the combustion temperature in the ...

Embodiment 3

[0045] Same as Example 1, for different coal types and particle sizes, the oxygen concentration in the primary air and the secondary air and the air volume ratio between them can be changed to maintain a good gas-solid flow and combustion state in the reactor. If the particle size of the fuel is large, the primary air volume can be appropriately increased to ensure the normal fluidization of the particles; when the fuel used is anthracite or other coal that is not easy to ignite or burn out, the oxygen content in the primary and secondary air can be increased. Optimize the combustion process. The oxygen volume fraction of the primary air in this embodiment is 35%, the oxygen volume fraction of the secondary air is 50%, and the rest is carbon dioxide. Among them, the primary wind is fluidized wind, accounting for 80% of the total air volume. The combustion temperature in the dense phase zone is 900-1000°C and the particle volume concentration is 0.35-0.45; the temperature in t...

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Abstract

The invention discloses a circulating fluidized-bed supercharged oxygen-enriched coal combustion device. The device is capable of realizing continuous running of a feeding system I, a fluidized-bed combustion reaction system II and a pressure deslagging system III in a pressure-bearing state. A pressure shell IV is arranged at the outermost part of a whole system, and capable of further increasing a running pressure of the system. The invention further provides a method for circulating fluidized-bed supercharged oxygen-enriched coal particle combustion. The method has the advantages of being wide in coal type adaptability, capable of easily realizing in-furnace sulfur fixation, and the like in a circulating fluidized-bed combustion technology, and enables coal to be combusted under a supercharged oxygen-enriched condition, so that the combustion efficiency can be further increased, the emission amount of nitrogen oxides is remarkably lowered, the CO2 concentration of combustion tail gas is greatly increased, and subsequent carbon capture is benefited. According to the device and the method, the adopted new circulating fluidized-bed supercharged oxygen-enriched combustion technology is capable of increasing the coal combustion efficiency, achieving low-pollution and low-carbon emission, and realizing efficient and clean utilization for coal resources.

Description

technical field [0001] The invention relates to a circulating fluidized bed pressurized oxygen-enriched coal combustion device and its application, belonging to the fields of clean coal combustion technology and fluidized bed combustion technology. Background technique [0002] The basic pattern of my country's primary energy dominated by coal is difficult to change in the short term. Promoting the clean and efficient development and utilization of coal is the foothold and primary task of my country's energy transformation and development. Existing clean coal technologies focus on the reduction of conventional sulfur and nitrogen pollutants. emissions, and there is no effective control method for the carbon products in the coal combustion process. In the international context of coping with climate change and vigorously reducing carbon dioxide emissions, it is an inevitable development direction to combine carbon dioxide emission reduction in the coal combustion process with ...

Claims

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Application Information

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IPC IPC(8): F23C10/18
CPCF23C10/18Y02E20/34
Inventor 庞磊邵应娟钟文琪
Owner SOUTHEAST UNIV
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