| Paper-making industry in China is a capital and technology intensive"Sunrise", as one of the revitalization industry, its main development directionis to eliminate backward production capacity, energy-saving and consumption-reducing of "low carbon economy" road. As poor stagnant water discharged inthe dryer has long-term restricted speed, yield and energy consumption of papermachine, dry steam supply system has been researched at home and abroad.From the view of practice application, the domestic paper machine dryer sectionwith multistage steam system has little effect on energy saving, as well as morestagnant water appears in the dryer. While the thermal compressor steam systemis introduced from abroad this problem is solved better. But domestic enter-prises usually use conventional thermal compressor with smaller adjustmentrange. Because of the thermal compressor suction dryer differential pressure hasbeen reduced, resulting in poor drainage of dryer, which causes stagnant water.To solve this problem, study on adjustable thermal compressor and modifica-tion of steam supply though adjustable thermal compressor dryer heatingsystem is of great significance to improve the efficiency of drying and dryingenergy-saving significant.This project is supported by Shaanxi Province SME Innovation Fund(10c26216103241).to solve a number of problems in China’s paper machinedryer section steam condensate system, advanced technology in design ofadjustable heat pump has been absorbed and researched. To improve theexisting paper machine steam condensate system, a new thermal control systemis developed. The major work is summarized as follows.（1）Through the analysis of the various types of steam supply system’sadvantages and disadvantages used in existing paper machine drying sections, anew type of steam system is proposed. It combines advantages of three-stagesteam supply and thermal compressor steam supply and uses adjustable thermal compressor to provide reliable condensate discharge, maximum heat transferefficiency and the most efficient steam use. By analyzing the parameterscomputational method of thermodynamic system, the thermodynamic equilib-rium computation model of the new style adjustable thermal compressor steamsystem is obtained, which provides a theoretical basis for the rational design ofsteam system.（2）Full study on thermal compressor implication of the paper machinethermal system, based on the predecessor’s design experience and analysis ofdesign method of conventional thermal compressor, a design method of adjust-able thermal compressor has been proposed. From the actual conditions, thesize of the adjustable thermal compressor structure is designed. As used fluidanalysis software CFD numerical simulation is used to analyze structuraldimension, is determined the range of adjustable thermal compressor perform-ance parameters and the calculation results are compared, it verifies thatwhether the design is reasonable.（3）Based on the analysis of existing conventional thermal compressorcontrol mode, a suitable control method of adjustable thermal compressor isproposed. According to the adjustable thermal compressor with a low selectivecontrol, together with the pressure and differential pressure control loop, anddryer section of the dryer group in the sub-paragraph control and processcontrol, it not only can ensure the rationality of dryer temperature curve, butalso can take full advantage of thermal energy. This control mode is implem-ented based on Siemens300PLC control system.（4）The new thermal compressor steam system is described in detailtaking Hunan tianhe the thermal control system whiteboard paper machine as anexample. |
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