All in all , additives are beneficial to improve the ignition of hcci at low engine load and extend the operating range . nevertheless , the knock happens obviously while the range is extending at the high engine speed and load 总之,添加剂有利于改善hcci发动机低负荷着火和拓宽工作范围,但是在发动机高转速和高负荷工况下,在工况范围拓宽的同时, hcci爆震倾向明显,发动机工作不稳定。
Both units ( 2x300mw ) of one power plant in india , designed and constructed by china , employ feedwater system composed of three 50 % capacity motor driven feedwater pumps , one low load feedwater control valve and one main motor - operated - valve 由我国承建的印度某电厂两台300mw发电机组,其给水系统设三台电动调速给水泵、一个低负荷给水调节阀(用于低负荷水位控制)和一个电动主闸阀。
The parameter is selected according to needing . according to analyzing , the power is cubic proportion to the speed , it is great remarkable to reduce the speed for releasing the load of suck - wind machine contrast to adjust the opening degree of baffle small 经分析得知，功率与速度的二次方成正比，因此引风机低负荷运行通过降速来实现，同关小风机入口挡板来实现相比节能效果是十分显著的。
The paper introduced the run characteristics and their designed load performance of large - scale units with output of 200mw and over in hubei province , as well as their improved load performance after the modification of burner for low - load stable combustion 摘要简要介绍了湖北省200mw及以上大型燃煤锅炉机组的运行特性、设计调峰性能，以及经过对燃烧器进行低负荷稳燃改造以后，调峰能力的改善。
The study proved that in order to get better power and emission performance , the lpg ratio should be controlled between 40 and 50 percent and the structure and working parameters should be optimized ; however , lpg should be fueled as less as possible when low load 本文研究表明：将lpg的掺烧比控制在40 - 50之间，进一步改进发动机的结构参数和运行参数，可以获得更好的lpg柴油双燃料发动机的综合特性；在低负荷时，尽量不要燃用lpg 。
Leaving the rated load , especially with low load and free running operation , ihe efficiency of turbocharger and ratio boost pressure decrease , leading to the shortage of air in cylinders and worsening of combustion , and the economic , power and exhaust performances deteriorate 当偏离标定点，尤其在低负荷和空转工况工作时，增压器效率降低，增压压力明显下降，导致气缸供气不足，缸内燃烧不良，柴油机的经济性能、动力性能和排放性能将严重恶化。
In fact , the adjustment of wind quantity is through the baffle at the entrance of suck - wind machine , when the strength of wind is low , the opening degree is small , induce vibration and stop running . the reform of suck - wind machine ' s frequency - conversion has great significance for the equipment running stable 另外由于异步电动机为固定转速，风量的调节靠调节风机入日的挡板的开度来完成，小风量时，风机挡板开度很小，造成风机的振动非常大，装置无法实现低负荷运行。
During unit startup and load is lower than 15 % , drum level is controlled by feedwater control valve , feedwater pump remains at minimum safety speed ; when load is between 15 % and 25 % , feedwater control valve is closing at fixed speed determined by function module , main motor - operated - valve is opened automatically , control mode of drum level is transferred to feedwater pump automatically and bumplessly ; when load is between 25 % and 50 % , control valve is closed fully , and main motor - operated - valve is open fully , drum level is controlled by one pump ; when load is more than 50 % , first pump is kept in operation , second pump is putting into operation automatically and 在机组启动、冲转及机组并网至15 %负荷阶段,给水泵维持在最低安全转速下运行,汽包水位由低负荷给水调节阀自动控制; 15 %至25 %负荷阶段,给水调节阀由函数模块按照一定的速率自动平滑关闭,主给水电动门自动打开,汽包水位控制方式自动无扰切换为给水泵自动控制;负荷在25 %至50 %阶段时,给水调节阀已完全关闭,主给水电动门已完全打开,水位控制已全由单台给水泵承担;负荷大于50 %后,在第一台给水泵运行的同时,第二台给水泵自动无扰投入。
At the conditions with the same fuel injection quantity per cycle and the same engine speed , with the increase of the additive mass fraction in the fuel , the ignition and heat release timings brought forward , the peak of heat release rate increased and the operating range at low engine load was enlarged obviously . however , excessive additives will make the engine be prone to knock , run rudely and shorten the operating range at high engine load 在相同循环喷油量和相同转速的条件下,随着添加剂质量分数的增加, hcci着火和燃烧放热提前,燃烧放热峰值提高,低负荷工况范围明显拓宽,但过高的添加剂质量分数会使得发动机爆震,工作粗暴,导致高负荷工况变窄。
The main problems existed in the measured buildings conclude : low energy efficiency plants , low eer when the cooling load decreased during the night period in hotels , bad management , dissatisfied indoor air quality , low efficient water system and so on . if we can avoid these problems , a lot of energy can be saved 重庆市公共建筑主要存在的问题有:设备效率达不到额定值,冷水机组冷量配备过大,酒店在夜间低负荷运行时空调系统能效比( eer )很低,室内环境很不令人满意,水系统输送效率低下,跑冒滴漏现象严重,运行管理混乱等。
