Auxiliary for improving pulverized coal gasification ash slag viscosity-temperature characteristics and preparation method

A technology of additives and ash, which is applied in the direction of fuel additives, petroleum industry, fuel, etc., can solve the problems affecting the stable operation of the gasifier and the sensitivity of slag viscosity to temperature changes, etc., to achieve improved viscosity-temperature characteristics and strong adaptability Effect

CN109576036AInactive Publication Date: 2019-04-05ANHUI UNIV OF SCI & TECH
5 Cites 5 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2019-04-05
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses an auxiliary for improving pulverized coal gasification ash slag viscosity-temperature characteristics. The auxiliary is characterized in that the adding amount and the mixtureratio of raw materials of the auxiliary are determined according to raw coal ash content and coal ash chemical composition, the adding amount ranges from 3% to 6%, the ash content of coal ash added with the auxiliary is lower than 25%, and the coal ash composition is characterized by CaO+MgO=13%-26%, CaO / MgO=0.6-2.6, SiO2+Al2O3=65%-78%, SiO2 / Al2O3=1.25-2.6. The coal ash composition is changed byadding the auxiliary, the auxiliary participates in coal ash mineral transformation, diopside remarkably melted acid oxide is generated at high temperature, low-temperature co-melting of calcium and magnesium minerals is promoted, the auxiliary varies from raw coal ash composition to raw coal ash composition and has strong pertinence, the viscosity-temperature characteristics of pulverized coal gasification ash slag can be remarkably improved, and coal with poor fusibility can effectively adapt to a liquid slagging gasifier.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the technical field of clean utilization of coal energy, in particular to an additive for improving the viscosity-temperature characteristics of pulverized coal gasification ash and a preparation method. Background technique

[0002] Coal gasification is an important leading technology for clean and efficient coal conversion. The development direction of large-scale coal gasification technology is high temperature and high pressure, which also means that liquid slag removal technology is the mainstream of gasification technology. The liquid slag discharge technology requires the operating temperature to be higher than the flow temperature of the coal ash, and the viscosity value in the corresponding temperature range is 5-25Pa·s. Therefore, the viscosity-temperature characteristics of the coal ash during the operation of the gasifier are highly valued. It is closely related to the stable operation of the device.

[0003] The a...

Examples

Embodiment 1

[0030] Example 1: The additive amount is 4% (coal-based), and the additive ratio is CaO:MgO=3:7, that is, the CaO additive ratio is 1.2% (coal-based), and the MgO additive ratio is 2.8% (coal-based), the composition of coal ash after adding additives is shown in Tables 2 and 3, the melting temperature of coal ash is shown in Table 4, and the viscosity-temperature characteristic curve of coal ash is shown in figure 2 .

Embodiment 2

[0031] Example 2: The additive amount of the additive is 6% (coal-based), and the additive ratio is CaO:MgO=1:1, that is, the CaO additive ratio is 3.0% (coal-based), and the MgO additive ratio is 3.0% (coal-based), the composition of coal ash after adding additives is shown in Tables 2 and 3, the melting temperature of coal ash is shown in Table 4, and the viscosity-temperature characteristic curve of coal ash is shown in image 3 .

Embodiment 3

[0032] Embodiment 3: The addition amount of auxiliary agent is 3% (coal base), the addition ratio of auxiliary agent is CaO:MgO=2:1, namely CaO addition ratio is 2.01% (coal base), MgO addition ratio is 0.99% (coal-based), the composition of coal ash after adding additives is shown in Table 2 and 3, and the melting temperature of coal ash is shown in Table 4.

[0033] Table 1 Industrial analysis results of coal samples

[0034]

[0035] Among them, Aad-ash content, Vad-volatile matter.

[0036] Table 2 Coal ash composition of coal samples

[0037]

[0038] Among them: "coal sample + 4% CaO:MgO=3:7" refers to the additives blended in the coal sample with a mass addition of 4%, where the blending ratio of CaO and MgO is = 3:7, and so on .

[0039] Table 3 Main parameters of coal ash composition of coal samples

[0040]

[0041] Table 4 Coal sample coal ash melting temperature

[0042]

[0043] It can be seen from Tables 1 to 4 that the flow temperature of Changpin...