Nozzle for increasing carbon conversion rate of pulverized coal entrained-bed gasifier

Abstract

The invention relates to a nozzle for increasing carbon conversion rate of a pulverized coal entrained-bed gasifier. The nozzle comprises outer water-cooled sleeves, an inner water-cooled sleeves, outer ring spray heads and inner ring spray heads which are coaxial from the outside and inside, wherein a cooling water leading-out channel is arranged between the outer water-cooled sleeves and the inner water-cooled sleeves, a cooling water introduction channel is arranged between the inner water-cooled sleeves and the outer ring spray heads, an outer ring channel is arranged between the outer ring spray heads and the inner ring spray heads, the inner ring spray heads form an inner ring channel, a front end water-cooled chamber is arranged at an outlet of the cooling water leading-out channel and an outlet of the outer ring channel is provided with a plurality of cyclones symmetrically. According the invention, the flow field in the gasifier is changed by designing the gasifier nozzle to enhance the mixing of pulverized coal and air flow, thereby prolonging the residence time of the particles and ultimately improving the carbon conversion rate in pulverized coal.

Description

technical field [0001] The invention belongs to the technical field of coal gasification, in particular to a nozzle for increasing the carbon conversion rate of a pulverized coal entrained bed gasification furnace. Background technique [0002] Coal meets nearly 30% of the world's primary energy demand, but the large-scale use of coal has had a great impact on the ecological environment. The pulverized coal gasifier is a kind of equipment that finally prepares synthesis gas with carbon monoxide and hydrogen as the main components by partially oxidizing coal and further reacting with other reaction media. Through the development of coal gasification technology, the environmental pollution problems caused by the use of coal can be alleviated, so it occupies an important position in the field of clean coal industry technology. [0003] Entrained bed gasifier has good fuel applicability, high operating temperature and pressure, high carbon conversion rate, and strong gas produc...

AI Technical Summary

Problems solved by technology

[0005] Prolonging the residence time can be achieved by increasing the size of the reactor, but this also increases the manufacturing cost. A more economical and feasible method is to optimize the flow of particles by rationally designing the gasification nozzle, so that the pulverized coal can be mixed with the high-temperature airflow. Thorough mixing, full use of reactor volume to prolong particle residence time

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