進口高壓旁路調(diào)節(jié)閥(德國OLES奧萊斯閥門)
【進口高壓旁路調(diào)節(jié)閥】詳細(xì)說明：
高壓旁路調(diào)節(jié)閥是一種結(jié)構(gòu)特殊的高壓差調(diào)節(jié)閥，該調(diào)節(jié)閥兼有啟動調(diào)節(jié)閥，減壓旁路閥和安全閥的作用。可實現(xiàn)快速自動跟蹤超壓保護，省去鍋爐安全閥。該閥能在6秒內(nèi)實現(xiàn)快速啟動，電動執(zhí)行機構(gòu)的控制系統(tǒng)通過調(diào)節(jié)蒸汽壓力以適應(yīng)機組不同工況的參數(shù)啟停和運行；機組甩負(fù)荷后鍋爐可以不立即熄火，等事故排除后，幾分鐘內(nèi)即可重新投入運行，既減少鍋爐的啟停次數(shù)，又減少了對汽輪機的熱沖擊。減溫水的調(diào)節(jié)與高壓旁路快速聯(lián)動，能大幅降溫降壓，減少電廠龐大的減溫減壓系統(tǒng)及設(shè)備，所以該閥是大容量單元再熱機組旁路系統(tǒng)的重要調(diào)節(jié)閥之一。
High-pressure bypass control valve is a special high-pressure differential control valve, which has the functions of starting control valve, relief bypass valve and safety valve. It can realize fast automatic tracking overpressure protection and save boiler safety valve. The valve can start quickly in 6 seconds, and the control system of the electric actuator can adjust the steam pressure to adapt to the start-up and shut-down of the parameters under different working conditions of the unit; the boiler can not immediately shut down after the load rejection of the unit, and can be put into operation again in a few minutes after the accident has been eliminated, thus reducing the number of start-up and shut-down of the boiler as well as reducing the number of start-up and shut-down. Less thermal shock on steam turbines. The rapid linkage between the regulation of temperature-reducing water and high-pressure bypass can greatly reduce temperature and pressure, and reduce the huge system and equipment of temperature-reducing and pressure-reducing in power plants. Therefore, the valve is one of the important regulating valves in the bypass system of large-capacity unit reheater units.
【進口高壓旁路調(diào)節(jié)閥】結(jié)構(gòu)說明：
高壓旁路調(diào)節(jié)閥工作條件很差，一般都在節(jié)流狀態(tài)下運行，溫差應(yīng)力很大，節(jié)流的汽蝕現(xiàn)象嚴(yán)重，閥門極易損壞。由此可見，設(shè)計制造出性能*、耐汽蝕、強度高、噪聲低、結(jié)構(gòu)簡單可靠的高壓旁路閥非常重要。針對上述工況要求，對高壓旁路調(diào)節(jié)閥結(jié)構(gòu)設(shè)計和材料選擇等方面進行了優(yōu)化，設(shè)計出新型的高壓旁路閥。其特點是節(jié)流元件采用了多孔套筒結(jié)構(gòu)，與閥芯構(gòu)成節(jié)流元件；在閥芯后布置降壓孔板；蒸汽出口設(shè)計成縮放口；減溫水由外部引入閥體后，通過多孔管噴出，與高溫蒸汽直接混合來降低蒸汽溫度；采用這些結(jié)構(gòu)后，使運行中汽蝕量大為減輕，延長了高壓旁路閥的使用壽命；閥座設(shè)計成可拆卸結(jié)構(gòu)，拆裝方便，便于檢修；閥座密封面采用斜面結(jié)構(gòu)，設(shè)計合理，使調(diào)整門密封面的密封達(dá)到很好效果。
【進口高壓旁路調(diào)節(jié)閥】特點：
蒸汽經(jīng)過4級節(jié)流，噪音低。蒸汽先通過套筒和閥座，壓力降低了一部分。節(jié)流罩下端的噴嘴向上噴出高速冷卻水，冷卻水在節(jié)流罩中心被高壓蒸汽霧化和混合的過程中，進行充分的熱交換，從而使高溫蒸汽再節(jié)流罩內(nèi)完成降溫過程，然后通過節(jié)流罩，再通過兩個節(jié)流孔板，把蒸汽壓力降低到額定要求，由于蒸汽的減壓減溫都在同一閥體內(nèi)完成，故系統(tǒng)不另設(shè)專門的減溫器。
b.高壓旁路控制系統(tǒng)能使這臺閥在6秒內(nèi)快速啟動，正常工況采用慢速調(diào)節(jié)。
c.上閥蓋采用自密封結(jié)構(gòu)，可防止蒸汽外溢。
