Bubbling fluidized bed type O2/H20 pressurized oxygen-enriched combustion system

Abstract

The invention discloses a bubbling fluidized bed type O2/H20 pressurized oxygen-enriched combustion system. According to the integral system, the entire process from air separation for oxygen, boiler combustion and heat exchange to CO2 capture is carried out with the high pressure maintained at 6 to 8 MPa, and compared with a traditional oxygen-enriched combustion technology, the system has the advantage that the compression energy consumption and depressurization loss are greatly reduced; a steam regulating system is utilized for replacing a gas recirculation system, a lot of vaporization latent heat is absorbed during water vaporization, and the temperature regulation ability is relatively strong, so that under the same condition, the flue gas amount is lower, and compared with O2/CO2 circulation, the system has the advantage that the energy consumption and waste heat loss of a fan can be greatly reduced; besides, the combustion temperature of a bubbling fluidized bed is relatively low, so that the generation amount of NOx can be effectively decreased; and a pressurized O2/H20 oxygen-enriched combustion technology is adopted, so that the vaporization latent heat of vapor can be utilized, the energy consumption and waste heat loss of the fan can be greatly reduced, and compared with a normal pressure O2/H20 oxygen-enriched combustion technology, the pressurized O2/H20 oxygen-enriched combustion technology has the advantage that the gross generation power is increased by about 7% and is quite considerable.

Description

technical field [0001] The invention belongs to energy technology application and CO 2 The trapping field specifically relates to a high-pressure fluidized bed steam regulating oxygen-enriched combustion system. Background technique [0002] Coal is not a clean energy, because the massive burning of coal resources will cause a series of environmental problems. A large amount of pollutants emitted not only endanger human health, but also damage animals and plants, destroy the ozone layer, and are also the main cause of the greenhouse effect, melting glaciers, sea level rise, acid rain and photochemical reactions. In the case of increasingly serious environmental hazards, people all over the world have realized that it is urgent to protect the environment. People are increasingly worried that a large amount of uncontrolled emission of carbon dioxide into the atmosphere will lead to a more serious greenhouse effect. [0003] The current mainstream normal pressure O 2 / CO 2...

AI Technical Summary

Problems solved by technology

However, the technology of air separation for oxygen production and high-concentration CO 2 Flue gas compression is carried out under high pressure, which consumes a lot of energy, but oxygen-enriched combustion is carried out under normal pressure, and the system pressure will experience a drop-rise, and the energy loss will be very serious

Combustion under pure oxygen, the flame temperature will be very high, the traditional adjustment method is to recycle the cleaned flue gas, because it is impossible to make all N 2 Both are separated, and the combustion temperature in the boiler is high, the accumulation of nitrogen will cause a lot of NOx

At the same time, when oxygen-enriched combustion technology is applied to pulverized coal boilers, there are still disadvantages such as too much flue gas recirculation, high power consumption, and poor economy.

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