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【单选题】
配煤过程中___是反映各种煤混合程度的指标,也是控制单位时间内入炉煤煤质波动范围的指标。
A. 混煤的挥发分;
B. 混煤的比例;
C. 混煤的粒度;
D. 混煤的发热量。
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答案
B
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推煤机如需放机油并且使悬浮在表面的杂质随机油一起排除时,应在发动机熄灭后___。
A. 立即进行;
B. 冷却一段时间后进行;
C. 温度与环境温度相同时再进行;D、低于环境温度时进行。
【单选题】
燃煤应按品种或___分类,分堆存放。
A. 水分;
B. 挥发分;
C. 煤质;
D. 含碳量。
【单选题】
非矿区火力发电厂煤炭储备量不低于___天耗用量。
A. 6~12;
B. 3~5;
C. 15~20;
D. 20天以上。
【单选题】
库存煤盘点一般___,盘点前需将煤场、煤沟等库存煤整理成一定形状,然后丈量计算出体积,并根据煤的密度计算出库存煤量。
A. 每月进行三次;
B. 每月进行一次;
C. 三个月进行一次;
D. 半年进行一次。
【单选题】
运煤过程中常说的“三大块”不包括___。
A. 大石块;
B. 大木块;
C. 大铁块;
D. 大冻块。
【单选题】
单路输煤系统设计出力1000t/h,双路同时运行,系统最大输送量为___t/h。
A. 2000;
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【单选题】
运行中煤的挥发分和硫分增大时,输煤系统应注意做好___和煤自燃的措施。
A. 防自流;
B. 防事故停机;
C. 防尘;
D. 防爆。
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一般煤的自然堆积角为___。
A. 5°~10°;
B. 10°~20°;
C. 30°~45°;
D. 50°~60°。
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红外线解冻库里采用煤气红外线辐射器作热源,以___进行解冻。
A. 对流热;
B. 辐射热;
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D. 蒸汽。
【单选题】
装煤气红外线原煤解冻库时,必须制订有关___的安全措施。
A. 防止触电;
B. 防止盗窃;
C. 防火防爆;
D. 防粉尘超标。
【单选题】
带式输送机的基本布置型式有___种。
A. 五;
B. 四;
C. 三;
D. 二。
【单选题】
TD75型皮带机型号中“TD”意为___。
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B. 统一型皮带机;
C. 皮带机;
D. 输送设备。
【单选题】
带式输送机在通常情况下,倾斜向上运输的倾角不超过___。
A. 35°;
B. 28°;
C. 20°;
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【单选题】
高倾角花纹带式输送机主要用于提升角度要求较大的输送,其倾角一般为___。
A. 18°;
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D. 40°。
【单选题】
带式输送机布置倾斜角超过4°时,一般都要设置___装置。
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【单选题】
钢丝绳芯胶带机的槽角一般为___。
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【单选题】
普通皮带机的带速不超过___m∕s。
A. 1.5;
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【单选题】
配煤段带速一般不超过___。
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检测带式输送机横向水平度用___。
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在带式运输机中,成本最大是___。
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输煤胶带在带式输送机成本中约占___的比重。
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【单选题】
如果天气较寒冷,有结冰的可能性时,推煤机停车后应待冷却水的温度降低些再将水全部放出,降低后的水温度在___℃左右。
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装有犁煤式卸料器的带式输送机,为减少胶带磨损,带速一般不宜超过___。
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皮带跑偏是因为皮带受到了一个指向跑偏侧的___的作用。
A. 弹力;
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D. 拉力。
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皮带跑偏开关一般设置___级警示或保护信号。
A. 一;
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【单选题】
皮带输送机的跑偏导致立辊倾斜角达到___时,集控室能收到事故停机信号。
A. 20°;
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输煤皮带运行中应注意监视、调整,使得皮带跑偏位移不超过___mm。
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用冷粘剂胶接输送带接头时,固化时间不低于___ min。
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带式输送机的胶带接头不正,运行中胶带跑偏现象是___。
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带式输送机胶带跑偏的原因之一是落煤点不正,处理方法是___。
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造成输煤系统皮带打滑的主要原因是___。
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以下不会导致输煤胶带打滑的原因是___。
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___会造成带式输送机的胶带打滑。
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B. 落煤点不正;
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【单选题】
胶带无载时发生跑偏,加上物料就能正,原因是___。
A. 初张力太大;
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胶带在运行中从某点开始局部跑偏,调整方法是___。
A. 检修或更换滚筒;
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胶带只在滚筒处跑偏,应该调整___。
A. 驱动装置;
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落煤筒严重堵塞会使上级皮带机电机的电流___。
A. 上升;
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跨越皮带时必须是___。
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胶带输送机的驱动装置是带式输送机动力的来源,电动机通过联轴器和减速器带动传动滚筒转动,借助于滚筒与胶带之间的___使胶带运转。
A. 离心力;
B. 摩擦力;
C. 重力;
D. 惯性力。
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