Composite additive for improving slagging and ash falling characteristics of Zhundong coal and application method thereof

A compound additive and additive technology, applied in the petroleum industry, solid fuel, fuel and other directions, can solve the problems of Zhundong coal slagging and other problems, and achieve the effect of avoiding economic loss, avoiding efficiency reduction and good thermal stability

Inactive Publication Date: 2018-12-18
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a compound additive for improving the slagging and ash shedding characteristics of Zhundong coal and its application method, so as to solve the above-mentioned technical problem that Zhundong coal is easy to slagging during the combustion process

Method used

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  • Composite additive for improving slagging and ash falling characteristics of Zhundong coal and application method thereof
  • Composite additive for improving slagging and ash falling characteristics of Zhundong coal and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The mass percentages of each component of the composite additive in Zhundong coal are shown in Table 1:

[0039] The mass percent of each component of composite additive in Zhundong coal in table 1, embodiment 1

[0040] components

[0041] The ash melting points of the coals that are prone to slagging after blending according to the data in Table 1 are respectively reduced by 60-90°C. After testing on the high-sodium and high-calcium Zhundong coal and the high-sodium, high-calcium and high-iron Zhundong coal in the sinking furnace, it is found that without adding The slag sample surface of the deposition probe at 1100°C was completely melted when the intumescent additive was used. After adding 4% intumescent additive, there was no completely melted or partially melted char on the surface of the deposition probe, and all of them were non-melted ash samples.

Embodiment 2

[0043] The mass percentages of each component of the composite additive in Zhundong coal are shown in Table 2:

[0044] The mass percent of each component of composite additive in Zhundong coal in table 2, embodiment 2

[0045] components

[0046] The ash melting points of coals that are prone to slagging after blending in Table 2 are respectively reduced by 20-50°C. After testing on high-sodium and high-calcium Zhundong coal and high-sodium, high-calcium and high-iron Zhundong coal in the sinking furnace, it was found that the addition of 2 After the deposition of the intumescent additive, there is still a very small amount of partially melted coke on the surface of the probe, so it is necessary to add 6% kaolin or 9% silica fume to increase the ash melting point, which can partially replace the intumescent additive and help power plants reduce costs. In the actual production process, the amount of intumescent additives used can also be appropriately reduced accordi...

Embodiment 3

[0048] The mass percentage composition of each composition is as shown in table 3 in the composite additive of the present invention:

[0049] The mass percent of each component in the composite additive in table 3, embodiment 3

[0050] components

[0051] In Example 3, the particle diameters of vermiculite and kaolin are both 200 μm. Silicon powder is a powder with a silicon content of 80%; the particle size of silicon powder is 100 μm. The desulfurizing agent magnesium oxide is a powder with a magnesium oxide content of 80%; the particle size of the desulfurizing agent magnesium oxide is 100 μm. The expansion coefficient of the expansion additive vermiculite is 5.

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Abstract

The invention discloses a composite additive for improving the slagging and ash falling characteristics of Zhundong coal and an application method thereof. The composite additive is composed of an expansion type additive--vermiculite, a silica-alumina type additive--kaolin or silicon powder, and a desulfurizing agent--magnesium oxide. The composite additive comprises the following components by mass: 15%-60% of vermiculite and 30%-60% of kaolin or silicon powder, with the balance being magnesium oxide. In the composite additive of the invention, vermiculite is used as an expansion type additive, has good thermal stability and strong gas adsorbing ability, and exerts certain auxiliary sodium fixation and sulfur fixation effect; through the addition of vermiculite, ash becomes loose and porous and is thus easy to remove, so the vermiculite is an additive with excellent anti-slagging properties; silicon powder and kaolin can increase an ash melting point and fix sodium; and magnesium oxide can play the role of desulfurization.

Description

technical field [0001] The invention belongs to the technical field of improving the slagging and ash shedding characteristics of Zhundong coal, and in particular relates to a composite additive for improving the slagging and ash shedding characteristics of Zhundong coal and its application method. Background technique [0002] Coal power will be the most important type of power source in China at present and for a long time to come, and Xinjiang is currently the largest undeveloped coal energy storage base in China. These characteristics greatly limit the large-scale application of this coal in coal-fired power generation. [0003] The main reason for coking and pollution when burning Zhundong coal is that it is rich in alkali metals. During the combustion process of coal, the salt components containing alkali metals are easy to precipitate, and with the decrease of flue gas temperature, they will be deposited on the heating surface. Condensation will cause the heating sur...

Claims

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Application Information

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IPC IPC(8): C10L9/10
CPCC10L9/10
Inventor 谭厚章周上坤熊小鹤王萌
Owner XI AN JIAOTONG UNIV
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