【摘要】：論文以粉煤為物料,研究了上出料發(fā)料罐系統(tǒng)特性,揭示了輸送壓力、輸送差壓、氣體進入方式和氣量、輸送管道距離流化板高度等參數(shù)對特征參數(shù)及輸送穩(wěn)定性的影響；對N2和CO2兩種載氣輸送煤粉能力和穩(wěn)定性進行了比較；對上、下出料系統(tǒng)在輸送能力、輸送穩(wěn)定性方面進行了比較；對固體質(zhì)量流量計的測量性能進行了考察。 研究結(jié)果表明：提高輸送壓力和輸送差壓,煤粉輸送量和固氣比增加,壓力信號波動性增加,在壓力較高時,煤粉輸送量和固氣比增加程度減弱；適量的錐部氣有利于煤粉輸送量、固氣比及輸送穩(wěn)定性的增加；底部氣增加對固氣比起抑制作用,在無錐部氣時對煤粉輸送量起促進作用,有一定錐部氣時則起抑制作用,對輸送穩(wěn)定性起促進作用；調(diào)節(jié)氣增加對固氣比和煤粉輸送量起抑制作用,但在較高壓力時,對煤粉輸送量的抑制作用減弱,對輸送穩(wěn)定性起促進作用；同等操作氣量條件下,管道距離流化板高度為50mmm時的煤粉輸送量和固氣比較80mm和120mm時大,但輸送穩(wěn)定性則在80mm略好些；N2和CO2兩種載氣輸送煤粉的能力和穩(wěn)定性相當;對上、下出料系統(tǒng)比較得出,下出料具有較高的煤粉輸送量和固氣比,壓力信號波動性也略好,但兩系統(tǒng)在總體上都達到了穩(wěn)定輸送。 另外,在靜態(tài)條件下考察了煤粉濕含量對電容式固體質(zhì)量流量計濃度傳感器測量性能的影響,給出了校正公式。在動態(tài)條件下的研究表明,輸送壓力對測量性能沒有影響,固相濃度超出標定范圍后固體質(zhì)量流量計測量偏差總體較大,而在標定固相濃度之內(nèi),當煤粉輸送量接近標定工況的輸送量時,其測量性能較好。
[Abstract]:In this paper, the characteristics of charging and discharging tank system are studied with pulverized coal as material, and the effects of conveying pressure, conveying differential pressure, gas entering mode and gas quantity, and the height of conveying pipe to fluidized plate on the characteristic parameters and transport stability are revealed. The capacity and stability of N _ 2 and CO2 for conveying pulverized coal are compared; the transport capacity and stability of the upper and lower discharge systems are compared; and the measurement performance of solid mass Flowmeter is investigated. The results show that with the increase of conveying pressure and differential pressure, the quantity of pulverized coal conveying and the ratio of solid to gas are increased, and the fluctuation of pressure signal is increased. When the pressure is high, the increase degree of the quantity of pulverized coal and the ratio of solid to gas is weakened. Proper amount of conical gas is conducive to the increase of pulverized coal conveying capacity, the ratio of solid to gas and the stability of conveying; the increase of bottom gas can promote the quantity of pulverized coal conveying when there is no conical gas, and when there is a certain cone gas, the increase of bottom gas will play a role in inhibiting the volume of pulverized coal conveying. Promoting the transport stability, regulating the increase of gas to restrain the ratio of solid to gas and the quantity of pulverized coal conveyer, but at higher pressure, the inhibiting effect on the quantity of pulverized coal conveyer is weakened, which promotes the stability of transportation; under the condition of the same operating gas quantity, The quantity of pulverized coal conveyer and the solid gas at the height of 50mmm from pipeline to fluidized plate are larger than those of 80mm and 120mm, but the transport stability is similar to that of the two kinds of carrier gas (80mm, N2 and CO2). The comparison between the upper and lower discharge systems shows that the transportation of pulverized coal is more stable than that of 80mm and 120mm. The lower discharging material has higher pulverized coal conveying capacity and solid gas ratio, and the pressure signal volatility is also slightly better, but the two systems have reached a stable transport overall. In addition, the influence of wet content of pulverized coal on the measurement performance of capacitive solid mass Flowmeter is investigated under static condition, and the correction formula is given. The study under dynamic conditions shows that the conveying pressure has no effect on the measurement performance, and the measurement deviation of solid mass Flowmeter is larger after the solid concentration exceeds the calibration range, but within the calibrated solid phase concentration. The measurement performance is good when the pulverized coal conveyer is close to the calibrated condition.
【學位授予單位】：華東理工大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TH232

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