Powdered coal combustor for entrained-flow bed gasification furnace

Abstract

The invention provides a powdered coal combustor for an entrained-flow bed gasification furnace. The powdered coal combustor comprises a central pipe and a peripheral pipe concentrically surrounding the central pipe. The cross section of a central pipe spray nozzle straight section is a sharp acute angle, two sides (namely the central pipe spray nozzle straight section and a central pipe spray nozzle outer-side slanted side corresponding to the straight section) of the acute angle are larger in length, guide pieces are arranged above the central pipe spray nozzle straight section, and a spiral guide chamber is arranged on a powdered coal channel defined by the central pipe and the peripheral pipe. The powdered coal combustor can effectively reduce the high-temperature radiation area and strength at the position of a central pipe spray nozzle, the service life of the powdered coal combustor can be prolonged, dismounting and maintenance of the spray nozzle are facilitated, the effect of mixing powdered coal and an oxidizing agent can be improved, the long-period stable operation of powdered coal gasification is achieved, and the cost for powdered coal gasification can be reduced.

Description

technical field [0001] The invention belongs to the field of coal gasification, in particular to a pulverized coal burner used in an entrained bed gasification furnace. Background technique [0002] my country is rich in coal resources, but relatively poor in oil and natural gas resources. Coal accounts for about 70% of total energy consumption and 50% of global coal consumption. The traditional coal utilization method is direct combustion, which is not only inefficient, but also seriously polluting, resulting in my country's emissions of sulfur dioxide, nitrogen oxides, and atmospheric mercury ranking first in the world. Coal gasification is an important way to cleanly utilize coal. This technology adapts to the sustainable development requirements of my country's economy and has developed rapidly in recent years. Coal gasification technology is to convert solid coal into gaseous hydrocarbons, CO, H 2 Its purpose is to obtain clean energy and chemical raw materials. The ...

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Problems solved by technology

Second, the maintenance and disassembly of the water jacket structure are relatively difficult, requiring professional maintenance units to disassemble and repair, and the cost is relatively high

[0005] In addition, in order to achieve good mixing of pulverized coal and oxidant, most of the existing technologies design swirl vanes near the outlet of the pulverized coal channel and the outlet of the oxidant channel, and the mixing effect of the swirl vane on the materials is not good

Moreover, the swirl blades are welded horizontally on the pipe wall of the material channel, and are subjected to the impact of high-speed logistics while bearing their own gravity. In the actual operation process, the swirl blades often fall off.

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