發(fā)布時間：2019-07-08 16:43

【摘要】：高壓差高固調(diào)節(jié)閥是煤炭液化裝置中的關(guān)鍵設(shè)備,安裝于高溫高壓分離器和高溫中壓分離器之間,起調(diào)節(jié)分離器液位高度和節(jié)流減壓作用。由于該調(diào)節(jié)閥運行工況惡劣,使得調(diào)節(jié)閥存在嚴(yán)重的氣蝕和磨損損傷,調(diào)節(jié)閥極易出現(xiàn)失效,已嚴(yán)重影響裝置的正常運行。本課題根據(jù)調(diào)節(jié)閥的運行環(huán)境、結(jié)構(gòu)及介質(zhì)物性等參數(shù),在基于計算機流體力學(xué)基礎(chǔ)上,構(gòu)建了高壓差高固工況調(diào)節(jié)閥的數(shù)值求解模型,通過對模型進行數(shù)值計算求解,獲取典型開度下調(diào)節(jié)閥空化場中流道內(nèi)介質(zhì)的壓力、速度、液相分率和磨損率等參數(shù)的分布,運用數(shù)值模擬方式分析閥門失效原因,并與現(xiàn)場失效調(diào)節(jié)閥進行對比,驗證數(shù)值模擬計算的可行性。針對閥芯、閥座等零件的氣蝕和磨損問題,開展結(jié)構(gòu)優(yōu)化方案設(shè)計和材料表面硬化研究;運用數(shù)值模擬技術(shù)對兩個結(jié)構(gòu)優(yōu)化方案進行數(shù)值模擬,對比數(shù)值模擬分析結(jié)果,最終選擇方案一作為調(diào)節(jié)閥的結(jié)構(gòu)優(yōu)化方案;通過開展材料表面硬化工藝試驗,對比激光熔覆、火焰重熔、超音速噴涂三種表面硬化工藝方法,從硬化方式對基材的要求、基材與熔覆層的結(jié)合方式、熔覆層的硬度、熔覆層的表面質(zhì)量等多方面因素考慮,最終選擇采用激光熔覆表面硬化工藝方法對調(diào)節(jié)閥零件熔覆Ni-WC粉末以提高其硬度。本文通過對調(diào)節(jié)閥結(jié)構(gòu)和材料同時進行優(yōu)化的創(chuàng)新方法,用于解決調(diào)節(jié)閥在高壓差、高固工況下的失效問題,為最終實現(xiàn)延長高壓差高固調(diào)節(jié)閥的使用壽命提供理論依據(jù)。
[Abstract]:The high-pressure differential high-solid regulating valve is the key equipment in the coal liquefaction plant, and is installed between the high-temperature and high-pressure separator and the high-temperature medium-pressure separator, so as to regulate the liquid level of the separator and the effect of throttling and pressure reduction. Because of the severe operating conditions of the regulating valve, the regulating valve has serious cavitation and wear damage, and the regulating valve is easy to fail, and the normal operation of the device has been seriously affected. according to the operating environment, structure and physical property of the regulating valve, the numerical solution model of the high-pressure difference high-solid working condition regulating valve is constructed on the basis of the fluid mechanics of the computer, and the numerical calculation and solution are carried out on the model, The distribution of pressure, velocity, liquid fraction and wear rate of the medium in the cavitation field of the regulating valve in the typical opening degree is obtained. The failure reason of the valve is analyzed by means of numerical simulation, and the feasibility of the numerical simulation is verified by comparing with the on-site failure regulating valve. According to the problems of cavitation and wear of the valve core, valve seat and other parts, the structure optimization scheme design and the material surface hardening research are carried out, and the numerical simulation of the two structural optimization schemes is carried out by using the numerical simulation technology, and the results of the numerical simulation analysis are compared. in that final selection scheme, an optimization scheme of the structure of the control valve is adopted; the requirement of the base material, the bonding mode of the base material and the cladding layer are compared by the surface hardening process test of the material, the comparison of the laser cladding, the flame remelting, the supersonic spray three surface hardening process method, the requirement of the substrate from the hardening mode, the bonding mode of the base material and the cladding layer, The hardness of the cladding and the surface quality of the cladding are taken into consideration, and the surface hardening process of the laser cladding is adopted to cladding the Ni-WC powder on the valve part to improve the hardness. In this paper, an innovative method for optimizing the structure and material of the regulating valve is proposed, which is used to solve the failure of the regulating valve under high pressure and high solid working conditions, and provides a theoretical basis for the final realization of the service life of the high-pressure differential high-solid regulating valve.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TQ529;TQ055.81

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