【摘要】：離心式壓縮機(jī)是冶金、石油化工等工業(yè)部門廣泛使用的大型關(guān)鍵設(shè)備。壓縮機(jī)是將原動(dòng)機(jī)的機(jī)械能轉(zhuǎn)換成氣體壓力能的裝置。喘振是壓縮機(jī)的固有特性,它是離心式壓縮機(jī)工作在小流量時(shí)的不穩(wěn)定流動(dòng)狀態(tài),喘振時(shí)壓力和流量周期性大幅度變化,并可能損壞軸承、密封,進(jìn)而造成嚴(yán)重的事故。因而,制定正確的防喘振控制策略對(duì)于確保壓縮機(jī)的安全運(yùn)行有著重要意義。 本文以廣義最小方差性能評(píng)價(jià)基準(zhǔn)為基礎(chǔ),以上海寶鋼集團(tuán)羅涇電廠的聯(lián)合循環(huán)發(fā)電機(jī)組(Combined Cycle Power Plant—CCPP)中的煤氣系統(tǒng)壓縮機(jī)為研究對(duì)象。在深入研究了基于廣義最小方差控制系統(tǒng)性能評(píng)價(jià)方法和離心式壓縮機(jī)工作原理的基礎(chǔ)上,針對(duì)離心式壓縮防喘振切換控制切換點(diǎn)的選擇問題,提出了基于性能評(píng)價(jià)方法的防喘振切換控制方法。 基于性能評(píng)價(jià)方法的防喘振切換控制策略基本思路是通過時(shí)間序列分析的方法,對(duì)現(xiàn)場采集的壓縮機(jī)數(shù)據(jù)建立時(shí)間序列模型,從中提取反饋不變項(xiàng),從而對(duì)壓縮機(jī)防喘振PI控制系統(tǒng)進(jìn)行性能評(píng)價(jià),求出系統(tǒng)的性能指數(shù)。當(dāng)系統(tǒng)性能指數(shù)下降到某一個(gè)預(yù)定值時(shí),認(rèn)為此時(shí)控制系統(tǒng)性能變差,已經(jīng)不能滿足壓縮機(jī)防喘振控制要求,需改變控制策略進(jìn)行切換,即由回流閥由PI調(diào)節(jié)規(guī)律切換到跳變調(diào)節(jié)規(guī)律,以保證回流量的充足。仿真結(jié)果驗(yàn)證了該方法的有效性和實(shí)用性。
[Abstract]:Centrifugal compressor is a large-scale key equipment widely used in metallurgy, petrochemical and other industrial sectors. A compressor is a device that converts the mechanical energy of a prime mover into gas pressure energy. Surge is the inherent characteristic of compressor, it is the unstable flow state of centrifugal compressor working in small flow rate, the pressure and flow rate change greatly periodically during surge, and it may damage bearing, seal and cause serious accident. Therefore, it is important to make correct anti-surge control strategy to ensure the safe operation of compressor. Based on the generalized minimum variance performance evaluation benchmark, the gas system compressor in (Combined Cycle Power Plant-CCPP of Luojing Power Plant of Shanghai Baosteel Group is taken as the research object in this paper. Based on the study of the performance evaluation method of generalized minimum variance control system and the working principle of centrifugal compressor, the selection of switching control points for centrifugal compression anti-surge control is studied. An anti-surge switching control method based on performance evaluation method is proposed. The basic idea of anti-surge switching control strategy based on performance evaluation method is to establish a time series model of compressor data collected on the spot through time series analysis, and extract feedback invariants from it. Therefore, the performance evaluation of compressor anti-surge PI control system is carried out, and the performance index of the system is obtained. When the performance index of the system drops to a certain predetermined value, it is considered that the performance of the control system becomes worse, which can no longer meet the anti-surge control requirements of the compressor, so it is necessary to change the control strategy. That is, the return valve is switched from PI regulation to jump regulation to ensure the adequacy of reflux. Simulation results show that the method is effective and practical.
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TH452

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相關(guān)期刊論文 前1條

1 魏龍,袁強(qiáng);離心式壓縮機(jī)的喘振及控制[J];風(fēng)機(jī)技術(shù);2004年01期

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本文編號(hào)：2335939