Method for lowering fusing temperature of coal ash

A melting temperature and coal ash technology, which is applied in the petroleum industry, solid fuel, fuel additives, etc., can solve the problems of failing to reduce the melting temperature of coal ash, unspecified dosage range, complicated production process, etc., to increase the cost of raw materials, The effect of wide applicability and easy availability of raw materials

Active Publication Date: 2016-05-04
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Application Information

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Problems solved by technology

The co-solvent disclosed in these two patents not only did not specify the type of coal it is suitable for, nor did it specify its dosage range, and its production process was relatively complicated; If the dosage is insufficient, the effect of lowering the melting temperature of coal ash cannot be achieved, and if the dosage is excessive, it will affect other properties of coal ash

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  • Method for lowering fusing temperature of coal ash
  • Method for lowering fusing temperature of coal ash
  • Method for lowering fusing temperature of coal ash

Examples

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Effect test

Embodiment 1

[0039] Using Maiduoshan (MDS coal) used in liquid coal-water slurry gasification for liquid slagging in Ningxia area as raw coal, according to the method of reducing the melting temperature of coal ash of the present invention, including the step of adding a flux to the raw coal ,Methods as below:

[0040] (1) Obtain effective samples in batches from MDS coal, and grind and ash some coal samples of each batch to obtain MDS standard coal ash samples of each batch;

[0041] In addition, in order to verify whether the method of the present invention can reduce the coal ash fusion temperature of MDS coal, the inventor also measured the ash fusion temperature of each batch of MDS standard coal ash samples, that is, respectively obtained the deformation temperature of each batch of standard coal ash samples (DT), softening temperature (ST), hemispherical temperature (HT) and flow temperature (FT). The specific data are shown in Table 1:

[0042] Table 1 Ash melting temperature of ...

Embodiment 2

[0059] Select the MDS standard coal ash sample of the MDS-2 batch among the embodiment 1 to carry out flux addition (the ash content of this batch coal sample is about 15%), select CaO as flux, test according to the following steps:

[0060] a) Grind the MDS standard coal ash sample of the MDS-2 batch to obtain a coal ash sample, divide it into 4 parts, add CaO (powder particle size less than 0.2mm) to each part of coal ash and mix evenly, and each part of coal ash The amount of CaO added increases successively with the amount of 10wt% of the weight of coal ash, that is, the amount of CaO added is respectively 10wt%, 20wt%, 30wt%, 40wt% of each part of coal ash mass (that is, the amount of CaO is the raw coal mass 1.5wt%, 3wt%, 4.5wt%, 6wt%) of each test coal ash sample 1-4 (abbreviated sample 1-4);

[0061] b) Measure the contents of acidic oxides and basic oxides in samples 1-4 respectively, and calculate the mass ratio of acidic oxides and basic oxides in each sample, the r...

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Abstract

The invention provides a method for lowering a fusing temperature of coal ash. The method comprises the step of adding a fusing assistant into feed coal, wherein the mass ratio of acidic oxides to alkaline oxides in the coal ash resulting from the ashing of the feed coal is greater than 6.5; and the addition level of the fusing assistant is such that the mass ratio of the acidic oxides to the alkaline oxides in the coal ash resulting from the ashing of a mixture of the feed coal and the fusing assistant is 1.5 to 4.5. The method provided by the invention has outstanding applicability, has practical guiding significance in specific industrial coal and is particularly applicable to coal types, of which the mass ratio of the acidic oxides to the alkaline oxides is large; proceeding with adjustment on the ash ingredient ratio of the coal ash, the addition level of the fusing assistant can be adjusted according to different ash ingredients of different feed coals, so that the flexibility is high, and the applicability is high; the fusing assistant is wide in source and low in cost, so that the production cost cannot be increased markedly; and the method is easy and feasible, and the fusing assistant and the feed coal can be subjected to industrial grinding simultaneously and be mixed uniformly, so that the method is applicable to a gas-flow bed technology for coal-water slurry and dry powder coal gasification.

Description

technical field [0001] The invention belongs to the field of clean utilization of coal energy, and in particular relates to a method for reducing the fusion temperature of coal ash. Background technique [0002] my country's energy structure is characterized by rich coal, short of oil, and little gas. The energy structure determines the status of developing clean coal technology, among which coal gasification is the core technology for clean and efficient utilization of coal. [0003] At present, the coal gasification technology of more than 1000t / d that has been industrialized mainly adopts the entrained bed technology. The characteristics of the entrained bed determine that it has the greatest potential to increase the temperature, increase the pressure and strengthen the mixing. The slagging method of the entrained bed gasifier adopts "liquid slagging", that is, the operating temperature is generally higher than the ash melting point of the type of coal burned, so that t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L10/00C10L9/10
CPCC10L9/10C10L10/00
Inventor 杨英杨磊夏支文马乐波井云环杨帅刘春萌罗春桃袁炜潘强
Owner CHNA ENERGY INVESTMENT CORP LTD
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