瓦斯發(fā)電機(jī)組作為清潔能源利用的關(guān)鍵設(shè)備，其缸溫異常升高是運(yùn)行維護(hù)中需重點(diǎn)關(guān)注的故障征兆。缸溫過高不僅會降低熱效率，還可能引發(fā)爆震、拉缸等嚴(yán)重事故。這一現(xiàn)象背后往往隱藏著燃料供給、冷卻系統(tǒng)、機(jī)械負(fù)荷等多重因素的耦合作用。

　　As a key equipment for clean energy utilization, the abnormal increase in cylinder temperature of gas generator sets is a key fault sign that needs to be closely monitored during operation and maintenance. Excessive cylinder temperature not only reduces thermal efficiency, but may also cause serious accidents such as detonation and cylinder pulling. Behind this phenomenon, there is often a coupling effect of multiple factors such as fuel supply, cooling system, and mechanical load.

　　燃料供給系統(tǒng)的波動是缸溫升高的直接誘因。瓦斯氣體成分復(fù)雜，若甲烷濃度偏低或含有過量氮?dú)?、二氧化碳等惰性氣體，會導(dǎo)致燃燒速度減緩，后燃期延長。未燃盡的混合氣在排氣沖程中繼續(xù)燃燒，使缸內(nèi)溫度異常升高。此外，燃?xì)鉃V清器堵塞或調(diào)壓閥故障會造成供氣壓力不穩(wěn)，空燃比失調(diào)，局部過濃或過稀的混合氣均會改變?nèi)紵M(jìn)程，引發(fā)缸溫波動。

　　The fluctuation of the fuel supply system is the direct cause of the increase in cylinder temperature. The composition of gas is complex. If the methane concentration is low or contains excessive inert gases such as nitrogen and carbon dioxide, it will slow down the combustion rate and prolong the post combustion period. The unburned mixture continues to burn during the exhaust stroke, causing an abnormal increase in cylinder temperature. In addition, blockage of the gas filter or malfunction of the pressure regulating valve can cause unstable supply pressure, imbalance of air-fuel ratio, and local over rich or over lean mixture can change the combustion process, leading to cylinder temperature fluctuations.

　　冷卻系統(tǒng)的效能衰減是缸溫失控的核心誘因。水泵葉輪磨損、節(jié)溫器卡滯會導(dǎo)致冷卻液循環(huán)量不足，缸套水腔無法有效散熱。散熱器表面積塵或翅片變形會降低散熱效率，特別是在高溫環(huán)境或高負(fù)荷工況下，冷卻液溫度可能突破臨界值。更隱蔽的故障源于中冷器性能下降，增壓空氣未經(jīng)充分冷卻即進(jìn)入燃燒室，導(dǎo)致進(jìn)氣溫度過高，壓縮終了溫度上升，形成惡性循環(huán)。

　　The efficiency degradation of the cooling system is the core cause of cylinder temperature runaway. Wear of the water pump impeller and sticking of the thermostat can lead to insufficient circulation of coolant and ineffective heat dissipation in the cylinder liner water chamber. Dust accumulation on the surface of the radiator or deformation of the fins can reduce the heat dissipation efficiency, especially in high-temperature environments or high load conditions, where the coolant temperature may exceed the critical value. A more covert fault stems from the decreased performance of the intercooler, where the boost air enters the combustion chamber without sufficient cooling, resulting in an excessively high intake temperature and an increase in the final compression temperature, forming a vicious cycle.

　　機(jī)械負(fù)荷的突變會加劇缸溫升高。當(dāng)發(fā)電機(jī)負(fù)載突變時(shí)，ECU需快速調(diào)整噴氣量與點(diǎn)火角。若增壓器響應(yīng)滯后，進(jìn)氣壓力無法匹配燃料供給量，會造成瞬時(shí)過富油燃燒?；钊h(huán)磨損或缸套變形會導(dǎo)致密封性下降，高壓燃?xì)飧Z入曲軸箱，既浪費(fèi)能量又使缸內(nèi)燃燒工況惡化。連桿軸承間隙超標(biāo)會引發(fā)振動，改變活塞運(yùn)動軌跡，影響燃燒室形狀，造成局部溫度過高。

　　The sudden change in mechanical load will exacerbate the rise in cylinder temperature. When the load of the generator suddenly changes, the ECU needs to quickly adjust the jet volume and ignition angle. If the turbocharger response lags behind and the intake pressure cannot match the fuel supply, it will cause instantaneous over rich combustion. Wear of piston rings or deformation of cylinder liners can lead to a decrease in sealing performance, causing high-pressure gas to enter the crankcase, wasting energy and deteriorating combustion conditions inside the cylinder. Excessive clearance between connecting rod bearings can cause vibration, alter the trajectory of piston movement, affect the shape of the combustion chamber, and result in local overheating.

　　控制系統(tǒng)的邏輯缺陷可能掩蓋缸溫異常。氧傳感器漂移會使ECU誤判空燃比，長期處于過濃或過稀狀態(tài)。缸溫傳感器本身故障或線路接觸不良，會導(dǎo)致顯示值與實(shí)際值偏離，使保護(hù)系統(tǒng)無法及時(shí)啟動。部分機(jī)組因程序缺陷，在變負(fù)荷工況下無法動態(tài)調(diào)整點(diǎn)火提前角，使燃燒相位偏離最佳區(qū)間，額外增加熱負(fù)荷。

　　Logical defects in the control system may mask abnormal cylinder temperature. Drifting of the oxygen sensor can cause the ECU to misjudge the air-fuel ratio and remain in an overly rich or lean state for a long time. The cylinder temperature sensor itself has a malfunction or poor circuit contact, which can cause the displayed value to deviate from the actual value, making it impossible for the protection system to start in a timely manner. Due to program defects, some units are unable to dynamically adjust the ignition advance angle under variable load conditions, causing the combustion phase to deviate from the optimal range and additional heat load.

　　環(huán)境因素與維護(hù)疏漏的疊加效應(yīng)不容忽視。海拔升高導(dǎo)致的進(jìn)氣壓力下降，若未調(diào)整燃?xì)夤┙o量，會使混合氣過濃。機(jī)房通風(fēng)不良造成環(huán)境溫度過高，會降低散熱系統(tǒng)的對流換熱效率。長期未更換機(jī)油或使用劣質(zhì)潤滑油，會形成油泥堵塞油道，使活塞冷卻噴嘴無法正常工作，加劇缸套-活塞組的熱應(yīng)力。

　　The combined effect of environmental factors and maintenance omissions cannot be ignored. The decrease in intake pressure caused by altitude rise, if the gas supply is not adjusted, will make the mixture too rich. Poor ventilation in the computer room can cause high ambient temperatures, which can reduce the convective heat transfer efficiency of the cooling system. Long term failure to replace engine oil or use inferior lubricating oil can result in oil sludge blocking the oil passage, causing the piston cooling nozzle to malfunction and exacerbating the thermal stress on the cylinder liner piston assembly.

　　針對缸溫異常，需建立系統(tǒng)性排查機(jī)制。通過燃?xì)獬煞址治鰞x確認(rèn)燃料品質(zhì)，使用內(nèi)窺鏡檢測燃燒室積碳情況，結(jié)合紅外測溫儀繪制缸體溫度場。在維護(hù)層面，應(yīng)嚴(yán)格執(zhí)行冷卻液冰點(diǎn)測試與沸點(diǎn)檢測，定期清洗中冷器與散熱器芯體。對于控制系統(tǒng)，需驗(yàn)證傳感器量值溯源，通過標(biāo)定軟件優(yōu)化控制MAP圖。當(dāng)缸溫接近限值時(shí)，應(yīng)分級采取降負(fù)荷、開旁通、增補(bǔ)風(fēng)等應(yīng)急措施，避免故障擴(kuò)大。

　　A systematic troubleshooting mechanism needs to be established for abnormal cylinder temperature. Confirm the fuel quality through a gas composition analyzer, use an endoscope to detect carbon deposits in the combustion chamber, and use an infrared thermometer to draw the temperature field of the cylinder body. At the maintenance level, it is necessary to strictly perform coolant freezing point and boiling point tests, and regularly clean the intercooler and radiator cores. For the control system, it is necessary to verify the traceability of sensor values and optimize the control MAP diagram through calibration software. When the cylinder temperature approaches the limit value, emergency measures such as load reduction, bypass opening, and supplementary air should be taken in stages to avoid the expansion of the fault.

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