High ash melting point coal seed gasification method and device thereof

A technology with high ash melting point and coal type, which is applied in the direction of granular/powder fuel gasification, etc., can solve the problems of increasing nitrogen oxide emissions of atmospheric pollutants, insufficient combustion, large temperature gradient, etc., and achieves simple structure and convenient operation. , the effect of increasing the average temperature level

Inactive Publication Date: 2008-08-06
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
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Problems solved by technology

The existence of this kind of flame tongue or torch makes the combustion reaction take place in a small area, forming a local ultra-high temperature zone, the temperature gradient in the furnace is large, the combustion is not sufficient, and the thermal efficiency is low; on the other hand, it also increases the air pollutant nitrogen oxides (NOx) emissions

Method used

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  • High ash melting point coal seed gasification method and device thereof
  • High ash melting point coal seed gasification method and device thereof
  • High ash melting point coal seed gasification method and device thereof

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Experimental program
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Embodiment 1

[0024]Fig. 1 is a schematic structural view of the high ash melting point coal gasification method and device embodiment 1 of the present invention; Fig. 2 is a sectional view A-A of the schematic structural view of embodiment 1; Fig. 3 is a sectional view B-B of the schematic structural view of embodiment 1. In this embodiment, the gasifier is composed of a metal shell 2 , a thermal insulation layer 3 , a refractory liner 4 , an oxidant nozzle 6 , a pulverized coal nozzle 7 , and steam nozzles 5 and 8 . The metal shell 2 can withstand 0.1-4Mpa at 20°C-400°C; the ratio of the height to the inner diameter of the gasifier D:H=1:1.5, the height H1 of the pulverized coal nozzle 7=0.2H, and the height H2 of the oxidant nozzle 6= 0.2H, the height H3 of the steam nozzles 5 and 8 = 0.5H; the oxidant nozzle 6 and the steam nozzle 5 are on the same vertical plane, and the steam nozzles 5 and 8 are opposite to each other on the horizontal circle. The oxidizing agent is selected from indu...

Embodiment 2

[0028] In this embodiment, the overall structure of the gasifier is the same as that of Embodiment 1, the difference is that the position of the pulverized coal nozzle 7 is changed, as shown in Figure 2, and it is placed on the bcd arc section on the A-A view plane of Figure 1 Move, or move down the position of the pulverized coal nozzle 7 so that its height is lower than the oxidizer nozzle 6; or delete one of the two steam nozzles 5 and 8 in the middle and lower section of the furnace body at the same time, as only the steam nozzle 5 is left, as As shown in Figure 4; or increase the steam nozzles in the middle and lower section of the furnace body to three to four to form tangential swirl jets in the same direction. In addition, other furnace structure and parameters are not changed. This embodiment can also achieve the advantages of Embodiment 1.

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Abstract

The invention discloses a vertical pressurization entrained flow gasification method and a device which is suitable for dust coal with high ash fusion point, slag tapping, synthesis gas and liquid slag and flows to a slag hole of down stream, the device comprises a metal casing 2 of a gasification stove, a thermal-insulating heat-insulating layer 3, a flame-proof inner container 4, a oxidize nozzle 6, a dust coal nozzle 7, a water vapor nozzle 5 and a water vapor nozzle 8. The invention is characterized in that dust coals and gasifying agents are sprayed into a gasification stove through nozzles on different heights on stove walls in different stove inlet mode, dust coal is radially sprayed through a nozzle on the upper portion of a stove body under the conveying of carrier gas, oxidizing agent is injected with high speed through a nozzle 6 on another different on the upper portion of the stove body along the direction which is parallel to the circular cross section tangent of the stove body, water vapor is injected with high speed through nozzles 7 and 8 on the lower part of the stove body along the direction which is parallel to the circular cross section tangent of the stove body, and the rotating directions of the gasifying agents on the upper portion and the lower portion are the same. Contact and reaction time of dust coal and gasifying agents in the stove is increased, gasification reaction is led to be more complete, which is beneficial further improving gasification efficiency. And the method adopts a downwards parallel current model of synthesis gas and liquid slag, which smoothly achieve slag tapping of dust coal with high ash fusion point.

Description

Technical field: [0001] The invention belongs to the technical field of gasification of solid-state carbon-containing compounds, and in particular relates to a pressurized entrained entrained-bed gasification method and device for pulverized coal with a high ash melting point. Background technique: [0002] Clean coal technology has become a major key technology for my country's coal chemical industry, industrial gas and power industry technology upgrades, and coal gasification technology is one of the important directions of clean coal technology, and is the most important in the chemical system with coal-based energy. Core Technology. The characteristics of my country's coal are that coal with a high ash melting point and a flow temperature greater than 1500°C) accounts for about 50% of the total reserves; in addition, the average ash content of coal is relatively high, with an average of 23%, and the average ash content of thermal coal reaches 25%. The average ash content ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/46
Inventor 唐志国唐超君邢献军林其钊
Owner UNIV OF SCI & TECH OF CHINA
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