Xác định nhiệt độ và thời gian tự bốc cháy của hỗn hợp than trộn giữa than antraxit và than á-bitum=Determination of self-spontaneous temperature and ignition time of blened coal between anthracite and sub-bituminous pulverized coals

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Tác giả: Đức Dũng Lê, Hoàng Hiệp Lê, Hữu Linh Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học và Công nghệ - Đại học Đà Nẵng, 2024

Mô tả vật lý: tr.56-59

Bộ sưu tập: Metadata

ID: 252492

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The use of coal with a high volatile content requires preventive measures against self-ignition due to the oxidation process at low temperatures. Laboratory experiments were conducted to investigate the low-temperature oxidation process (90 ÷200oC) of coal blends consisting of different ratios of bituminous coal and anthracite coal, with bituminous coal ratios of 0, 25, 50, 75, and 100%. The coal samples were contained in cubic mesh boxes of various sizes (30, 60, and 100 mm) to assess the influence of thecoal pile volume on the self-ignition process. The Frank-Kamenetskii model was used to predict the self-ignition temperature and ignition time based on the coal pile volume. The results indicated that,increasing the ratio of bituminous coal in the mixed coal blend resulted in an increased self-ignition tendency. A larger coal pile volume corresponded to a lower self-ignition temperature and a longer ignition timeViệc sử dụng than có hàm lượng chất bốc cao yêu cầu các biện pháp phòng ngừa tự bắt cháy do quá trình oxi hóa ở nhiệt độ thấp. Các thí nghiệm trong phòng thí nghiệm đã được tiến hành để nghiên cứu về quá trình oxi hóa ở nhiệt độ thấp (90 ÷ 200 o C) của năm tỷ lệ trộn giữa bột than á-bitum và than antraxit với có tỷ lệ của than á-bitum là 0, 25, 50, 75 và 100%. Các mẫu than được chứa trong các hộp lưới lập phương có kích thước khác nhau (30, 60 và 100 mm) để đánh giá ảnh hưởng của thể tích đống than đến quá trình tự bắt cháy. Mô hình Frank-Kamenetskii được sử dụng để dự đoán nhiệt độ tự bắt cháy và thời gian bắt cháy theo thể tích của đống than. Các kết quả chỉ ra rằng, tăng tỷ lệ trộn của than á-bitum trong hỗn hợp than trộn dẫn đến tăng khả năng tự bắt cháy. Thể tích chứa than càng lớn, nhiệt độ tự bắt cháy càng thấp và thời gian tự bắt cháy càng dài.

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