本文關(guān)鍵詞： 高強瓦楞紙機 干燥部 能耗預(yù)測 能耗優(yōu)化 集散控制系統(tǒng)　出處：《陜西科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：節(jié)能降耗是造紙工業(yè)當(dāng)前面臨的熱點問題之一。在制漿造紙過程中,總汽耗的一半以上來自干燥部,而干燥部的能耗主要源自兩部分:烘缸內(nèi)部(蒸汽冷凝水熱力系統(tǒng))能耗和烘缸外部(氣罩通風(fēng)熱力系統(tǒng))能耗。長期以來,許多研究工作都是針對兩個系統(tǒng)分別進行能耗優(yōu)化。為了進一步地降低紙機干燥部能耗、提高能源利用效率,本文基于現(xiàn)有研究成果提出了干燥部能耗協(xié)同的概念,即同時考慮蒸汽冷凝水熱力系統(tǒng)的能量消耗與氣罩通風(fēng)熱力系統(tǒng)的能量消耗,實現(xiàn)二次熱能的循環(huán)綜合利用。本文以浙江某高強瓦楞紙機生產(chǎn)線的干燥工段為研究對象,在陜西省重點科技創(chuàng)新團隊計劃項目(項目編號:2014KCT-15)的資助下,圍繞干燥部能耗預(yù)測模型及能耗優(yōu)化控制策略開展應(yīng)用技術(shù)研究。論文的主要工作可分述如下:(1)多缸紙機干燥部能耗協(xié)同系統(tǒng)的設(shè)計針對造紙機干燥部熱力系統(tǒng),分別介紹多缸紙機干燥部的蒸汽冷凝水熱力系統(tǒng)和氣罩通風(fēng)熱力系統(tǒng)的不同供汽方案,并通過對比分析,闡述了各種方案的優(yōu)缺點。分析蒸汽冷凝水熱力系統(tǒng)中多余二次蒸汽和冷凝水的去向,將其用于氣罩通風(fēng)熱力系統(tǒng)中新風(fēng)的加熱,針對多缸紙機建立了干燥部能耗協(xié)同系統(tǒng),并闡述了其供汽方案,以達到提高能源利用效率的目的。(2)協(xié)同系統(tǒng)能耗預(yù)測模型的建立基于多缸紙機干燥部能耗協(xié)同系統(tǒng),針對高強瓦楞紙的干燥工藝,建立高強瓦楞紙機干燥部能耗協(xié)同系統(tǒng)。將系統(tǒng)按照熱力流程分為加熱器、各烘缸段、通風(fēng)系統(tǒng)等區(qū)域。對每個區(qū)域進行分析,根據(jù)能量守恒定律和物料守恒定律建立其熱力學(xué)模型,再通過匯總得出干燥部協(xié)同系統(tǒng)的能耗機理預(yù)測模型。經(jīng)過與工業(yè)現(xiàn)場實測蒸汽消耗量的對比,模型的預(yù)測偏差小于10%,與實際情況基本吻合。(3)協(xié)同系統(tǒng)能耗優(yōu)化的研究以干燥部的能耗費用最低作為優(yōu)化目標(biāo),以紙頁干燥工藝對參數(shù)的要求作為約束條件,根據(jù)協(xié)同系統(tǒng)的能耗預(yù)測模型和運籌學(xué)中的非線性規(guī)劃法,建立高強瓦楞紙機干燥部協(xié)同系統(tǒng)的能耗優(yōu)化模型。采用遺傳算法對能耗優(yōu)化模型進行求解,從而得出在一定環(huán)境下對能耗影響較大的幾個主要過程參量的最優(yōu)值,即各段烘缸的進汽壓力、氣罩送風(fēng)溫度及排風(fēng)溫度等。經(jīng)過優(yōu)化后,干燥部的能耗費用較優(yōu)化前可降低9.63%左右,節(jié)能效果明顯。(4)基于西門子S7-300 PLC能耗協(xié)同控制系統(tǒng)的實現(xiàn)根據(jù)各個最優(yōu)設(shè)定值相關(guān)控制回路的特點,設(shè)計其控制策略。以西門子S7-300系列PLC為硬件開發(fā)平臺,WinCC和Step7為軟件開發(fā)平臺,完成集散控制系統(tǒng)的開發(fā),實現(xiàn)對高強瓦楞紙機干燥部能耗協(xié)同系統(tǒng)的控制,從而達到能耗優(yōu)化的目的。本文設(shè)計的高強瓦楞紙機干燥部能耗協(xié)同系統(tǒng)及控制策略的優(yōu)化方法已在浙江某紙廠的一條高強瓦楞紙生產(chǎn)線上得到了應(yīng)用,經(jīng)過一段時間實際運行的結(jié)果表明:本文建立的能耗預(yù)測模型、能耗優(yōu)化模型以及相應(yīng)的控制系統(tǒng)在現(xiàn)場的應(yīng)用效果良好,可以有效降低系統(tǒng)能耗,為企業(yè)帶來了一定的經(jīng)濟效益。
[Abstract]:Energy saving is one of the hot issues in papermaking industry at present. In the paper pulping process, the steam consumption of more than half of the total energy consumption from drying, drying part mainly from two parts: internal dryer (steam condensate thermodynamic system) and energy consumption (hood ventilation dryer external thermal system) energy consumption. For a long time. A lot of research work is for the two systems were optimized. In order to further reduce the energy consumption of drying part of paper machine energy consumption, improve energy efficiency, this paper based on the existing research results put forward the concept of collaborative drying energy consumption, both steam condensate heating system energy consumption of ventilation system and the gas heating cover energy consumption. The realization of the two heat recycled. The drying section produced by Zhejiang of a high-strength corrugated paper machine line as the research object, in science and technology innovation team project of Shaanxi Province (item number: 2014KCT-15) supported by the Department of energy consumption prediction model and drying on energy consumption optimization control technology research and application development strategy. The main work of this dissertation is as follows: (1) multi cylinder drying section of paper machine energy consumption collaborative system design for the drying section of paper machine thermal system, different steam steam supply scheme were introduced the condensed water heating system and multi cylinder dryer section of paper machine hood ventilation thermal system, and through comparative analysis, expounds the advantages and disadvantages of various schemes. The analysis of steam condensate water heating system more than two times the steam and condensed water to the gas heating cover, fresh air heating system, aiming at cylinder dryer section of paper machine energy consumption of building a collaborative system, and expounds the steam supply scheme, to improve energy utilization efficiency. (2) the establishment of cooperative system energy consumption prediction model of multi cylinder paper machine dryer based on energy consumption The cooperative system, according to the drying process of high strength corrugated paper, corrugated paper machine drying department established cooperative system. The system for energy consumption in accordance with the thermodynamic process of the heater, dryer section, ventilation system and other areas. Each area is analyzed, according to the law of conservation of energy and keep the material constant the thermodynamic model established by law, summarize the mechanism of energy consumption drying section collaborative system prediction model. By comparison with the measured industrial steam consumption prediction model, deviation is less than 10%, consistent with the actual situation. (3) research on Collaborative energy optimization system for drying of minimal energy consumption cost as the optimization goal, the paper drying process on the parameter requirements as constraint conditions according to the nonlinear programming method, energy consumption prediction model and logistics collaborative system science, energy optimization model establishment of high-strength corrugated paper machine drying department coordination system. By using genetic algorithm to solve the optimization model of energy consumption, so as to obtain the optimal under certain environment mainly process several parameters influence on energy consumption value, namely the inlet steam pressure of each cylinder, gas hood air temperature and exhaust temperature. After optimization, the energy cost of drying part than before optimization can be reduced by about 9.63% and the energy saving effect is obvious. (4) the cooperative control system of SIEMENS S7-300 PLC to achieve the optimal energy consumption according to the set value control loop based on related characteristics, the design of control strategy. Based on SIEMENS S7-300 series PLC as the hardware platform, WinCC and Step7 as software development platform, the completion of the development of distributed control system, realize the cooperative control system on the strength of corrugated paper machine drying energy consumption, so as to achieve the purpose of energy optimization. The design of the drying section of corrugated paper machine collaborative optimization method of energy consumption system and control strategy Has a high strength corrugated paper production line in Zhejiang, a paper mill has been applied, after a period of time the actual operation results show that the energy consumption prediction model established in this paper, the application effect of energy consumption optimization model and the corresponding control system in the field is good, can effectively reduce the energy consumption of the system, to bring certain economic benefits for the enterprise.

【學(xué)位授予單位】：陜西科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TS73

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