Ceramics coal-water slurry nozzle having two-way gradient function and method for making same

A technology of gradient function and coal water slurry, which is applied in the field of two-way gradient function ceramic coal water slurry nozzle and its preparation, and can solve the problems such as the influence of the service life of the nozzle and the inability to alleviate the mechanical impact stress at the inlet end.

Inactive Publication Date: 2007-09-12
湖南工业大学陶瓷研究所
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  • Application Information

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Problems solved by technology

Due to the very harsh working conditions of the coal-water slurry nozzle, the existing homogeneous ceramic nozzles are difficult to meet the needs of actual production, and the thermal shock resistance of the ceramic coal-water slurry nozzle with one-way gradient function has been improved, but the mechanical shock at the entrance Stress cannot be relieved, nozzle life is still affected

Method used

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  • Ceramics coal-water slurry nozzle having two-way gradient function and method for making same
  • Ceramics coal-water slurry nozzle having two-way gradient function and method for making same
  • Ceramics coal-water slurry nozzle having two-way gradient function and method for making same

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Embodiment 1

[0019] Embodiment 1: Figure 1 is a schematic diagram of the structure of the bidirectional gradient function ceramic coal-water slurry nozzle of the present invention. Fig. 2 is a schematic diagram of the (W, Ti) C content gradient of the bidirectional symmetrical gradient function ceramic coal-water slurry nozzle. Take Al 2 o 3 As the matrix, according to (W, Ti) C content: 12%, 18%, 24%, 30%, 36%, 42%, 48% by mass percentage to weigh raw materials, configure 7 different (W, Ti) C content of Al 2 o 3 +(W, Ti)C ceramic composite powder; then carry out intensified ball milling respectively, with ethanol as the medium, and the ball milling time is 240 hours; the ball-milled Al 2 o 3 +(W, Ti)C ceramic composite powder was placed in a vacuum drying oven to dry, and after drying, it was sieved in a cabinet with a nitrogen-protected atmosphere; the dried 7 different (W, Ti) content of Al 2 o 3 +(W, Ti)C ceramic composite powders were respectively loaded into graphite molds, a...

Embodiment 2

[0020] Embodiment two: as described in embodiment one, the difference is the Al of 7 kinds of different (W, Ti) content 2 o 3 +(W,Ti)C ceramic composite powder was spread 11 layers in a graphite mold, the sintering temperature was 1700°C, the pressure was 30MPa, and the holding time was 45min, and a bidirectional asymmetric gradient function ceramic coal-water slurry nozzle was prepared. Fig. 3 is a schematic diagram of the gradient change of (W, Ti) C content in the nozzle.

Embodiment 3

[0021] Embodiment 3: As described in Embodiment 1, the difference is that 4 kinds of Al with TiC content of 15%, 25%, 35%, and 45% are configured respectively 2 o 3 + TiC solid solution ceramic composite powder, these powders are spread 7 layers in graphite mould. The sintering temperature is 1650°C, the pressure is 30MPa, and the holding time is 40min. Fig. 4 is a schematic diagram of the TiC content gradient variation of the ceramic coal-water slurry nozzle with bidirectional symmetrical gradient function.

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Abstract

A kind of two-way gradient function ceramics water coal liquid air spout and the manufacturing method it makes the A1203 as the basal body and makes the TiC or (W, Ti)C solid solution as the strengthening phase and the content of TiC or (W, Ti)C presents the two-way gradient variation along the air spout axial and the distribution law of the content decreases gradually from the air spout inlet to the middle and then increases gradually from middle to air spout outlet through allocating multiple kinds of ceramics composite powder and processing by strengthening ball polish, ridding, layer-by layer spreading, preliminary compression, and heat pressing sintering technology preparation. The inlet and outlet of the air spout have high flexibility and the middle if it has high degree of hardness used to release the heat stress of outlet area when the ceramics water coal liquid air spout working and the impact pressure of the inlet area and improve its heat-resistant ablating and abrasion ability. The ceramics water coal liquid air spout's heat-resistant ablating and abrasion ability is higher than the homogeneous ceramics water coal liquid air spout and the one-way gradient function air spout apparently and the use life is prolonged largely.

Description

technical field [0001] The invention relates to an atomizing nozzle used in a coal-water slurry boiler burner, in particular to a bidirectional gradient function ceramic coal-water slurry nozzle and a preparation method thereof. Background technique [0002] Coal water slurry is a clean coal-based liquid fuel, which has been widely used in boilers, kilns and large-scale forging furnaces in industries such as electric power, petrochemical, metallurgy, chemical industry, and building materials, and has produced good economic benefits. benefits, environmental benefits and social benefits. The nozzle is a key component in the coal water slurry burner, and the wear resistance, high temperature resistance and thermal shock resistance of the nozzle directly affect the application cost of the coal water slurry. When the coal-water slurry nozzle is working, it must not only bear the high-speed impact of high-hardness impurities such as pyrite and quartz in the coal slurry, but also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23D11/38
Inventor 丁泽良邹永生杨鹏
Owner 湖南工业大学陶瓷研究所
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