Entrained flow coal gasification method employing solid state slag-tap suitable for high ash content and high ash melting point coal

A high ash melting point, solid state slagging technology, applied in the field of coal gasification, can solve the problems of increasing oxygen consumption, slagging heat loss, inability to gasify coal with high ash melting point, and reducing the content of cold coal gas, etc. The effect of good chemical index, resource saving and less exhaust emission

Active Publication Date: 2009-06-17
安徽淮化集团有限公司 +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because the ash content of some coals with high ash melting point is also very high, for example, the general ash content is 8-35%, if the method of adding flux is used, it will inevitably increase the oxygen consumption, slag discharge and slag discharge heat loss to a certain extent ; If the method of increasing the gasification temperature (at this time, the gasification temperature is required to be above 1400°C), the oxygen consumption and the CO in the gas will be increased accordingly. 2 content and reduces the cold gas efficiency and the service life of the gasifier
In addition, the current coal gasification furnace is lined with refractory materials to prevent the furnace bricks from falling off due to brick laying defects, or part of the furnace bricks are thinned due to slag erosion and erosion, which will cause the local temperature of the furnace shell to be too

Method used

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  • Entrained flow coal gasification method employing solid state slag-tap suitable for high ash content and high ash melting point coal
  • Entrained flow coal gasification method employing solid state slag-tap suitable for high ash content and high ash melting point coal
  • Entrained flow coal gasification method employing solid state slag-tap suitable for high ash content and high ash melting point coal

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Experimental program
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Effect test

Embodiment 1

[0040] Embodiment 1: According to the method of the present invention, Huainan coal with high ash content and high ash melting point is used as raw material to produce synthesis gas.

[0041] The coal quality data analysis of Huainan coal is listed in Table 1 below.

[0042] Table 1

[0043]

[0044] The present invention was carried out using the coal described in Table 1 as the main raw material. It can be seen from the above table that the softening temperature (ST) of the coal is 1520°C, so the selected gasification temperature is 1300°C. According to the gasification method of the present invention, the Huainan high ash content and high ash melting point coal gasification method is carried out under the conditions of an operating pressure of 4.0 MPa and a gasification temperature of 1300°C.

[0045] Put Huainan coal with high ash content and high ash melting point after crushing, mix it with water and sodium lignin sulfonate additive aqueous solution into the mill (1...

Embodiment 2

[0051] Embodiment 2 (comparison)

[0052] The above-mentioned Huainan coal was used, and the gasification technology of liquid slag discharge in the prior art was adopted, that is, the gasification technology of adding flux and increasing the gasification temperature was used to carry out the same test as before.

[0053] The existing liquid slagging technology adopts the method of adding flux to lower the gasification temperature.

[0054] This embodiment requires the use of a large amount of flux, the amount of flux added is 50% (weight) of the ash content, the operating temperature of the gasification reactor is 1400°C, and the gasification pressure is 4.0Mpa.

[0055] Analyze according to GB / T17132-1997. The effective gas in the syngas (CO+H 2 ) is 77.65%, producing 1000Nm 3 (CO+H 2 ) coal consumption is 753kg, production is 1000Nm 3 (CO+H 2 ) Oxygen consumption is 456Nm 3 .

[0056] The prior art adopts a liquid slagging gasification method of increasing the gasific...

Embodiment 3

[0058] Embodiment 3: The present invention is carried out using Huainan coal with high ash content and high ash melting point in Embodiment 1.

[0059] Carry out in the same manner as in Example 1, except that the gasification conditions in this example are gasification pressure 4.0 MPa and gasification temperature 1250°C.

[0060] The effective gas components obtained in this embodiment were analyzed according to GB / T17132-1997, and the data analysis results are listed in Table 3 below.

[0061] table 3

[0062]

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Abstract

The invention provides a coal gasification method employing solid state slag-tap suitable for high ash content and high ash melting point Huainan coal. According to the invention, the gasification reactor temperature is controlled higher than 1100 DEG C and lower than the softening temperature of the high ash melting point coal. Through adjusting the ratio of gasification reactor height and diameter, the included angle of gasification reactor cone part and gasification reactor vertical housing part, the ratio of gasification reactor interior diameter and slagoff port diameter, the ash slag is discharged as solid state without fluxing medium. The method greatly reduces the operation temperature of the gasification reactor, prolongs the service life of fittings in the gasification reactor with little heat dissipation and low demand of refractory materials grade in the gasification reactor, simultaneously reduces the specific oxygen consumption and specific coal consumption, thereby not only saving cost but also saving resource.

Description

【Technical field】 [0001] The invention relates to the field of coal gasification, and more specifically, the invention relates to an entrained-bed coal gasification method using solid-state slag removal for coal with high ash content and high ash melting point. 【Background technique】 [0002] my country's energy resource structure is dominated by coal, and coal with high ash content, high ash melting point or both high ash content and ash melting point occupies a considerable share in the existing coal. Among them, Huainan coal in Anhui Province is particularly prominent, which is rich in coal resources and has a prospective reserve of 444×10 8 tons, with proven reserves of 153×10 8 tons, accounting for about 19% of the national reserves, however, Huainan coal in Anhui Province is a coal with high ash content and high ash melting point. At present, there are relatively mature coal gasification methods, whether using dry feed or wet feed, all adopt liquid slag discharge tec...

Claims

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Application Information

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IPC IPC(8): C10J3/54
CPCY02E20/18
Inventor 张俊陈林陈方林张香全赵以辉许令奇夏洪强张勇门长贵郑化安贺根良徐红东徐宏伟韦孙昌王锦朱春鹏蔡林清李世虎张林张泰松岳丽英
Owner 安徽淮化集团有限公司
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