Optimization for energy consumption in drying section of fluting paper machine

Abstract

Non-linear programming optimization method was used to optimize total steam and air consumption in the dryer section of multi-cylinder fluting paper machine. Equality constraints of the optimization model were obtained from specified process blocks considering mass and energy balance relationships in drying and heat recovery sections. Inequality constraints correspond to process parameters such as production capacity, operating conditions, and other limitations. Using the simulation, the process parameters can be optimized to improve the energy efficiency and heat recovery performance. For a corrugating machine, optimized parameters show the total steam use can be reduced by about 11% due to improvement of the heat recovery performance and optimization of the operating conditions such as inlet web dryness, evaporation rate, and exhaust air humidity, accordingly total steam consumption can be decreased from about 1.71 to 1.53 tonnes steam per tonne paper production. The humidity of the exhaust air should be kept as high as possible to optimize the energy performance and avoid condensation in the pocket dryers and hood exhaust air. So the simulation shows the supply air should be increased by about 10% to achieve optimal humidity level which was determined about 0.152 kgH 2 O/(kg dry air).

Possibilities of Reducing the Heat Energy Consumption in a Tissue Paper Machine—Case Study

“…Web drying in the paper machine is one of the most energy-consuming processes in the paper industry [1][2][3]. Energy consumption in paper drying is therefore an important factor influencing the profitability of the production [4].…”

“…Given the rising costs of electricity and gas, paper mills will be forced to introduce new, energy-efficient solutions in paper production in order to be competitive in the market. Recently, many articles have been written describing ways to improve the energy efficiency of pulp and paper mills [1,2,7,8]. The system is supplied with energy from gas and low-pressure steam.…”

Modeling of Ventilation’s Influence on Energy Consumption in Multi-cylinder Dryer Section Part1: Theoretical Model

“…Kong et al found that the drying section had about 4.6% energy saving potential by reasonably adjusting the ventilation system for a corrugated paper machine [21]. Ghodbanan [22] and Li [23] et al found the total steam consumption can be reduced about 11 and 5.6% by optimizing the operation conditions, respectively; Laurijssen et al pointed out that heat consumption can be reduced by 32% by increasing the dew point temperature and further recovering the waste heat [24]. But high inlet air temperature will increase the steam consumption of the air heater, Sundqvist points out that increasing the supply air temperature from 80-90 °C to 120-130 °C, the steam consumption of the drying section will increase by 2% [25].…”

Energy system optimization model for tissue papermaking process

“…Kong et al (Kong and Liu 2012) used the cylinder group as the minimum modeling unit and the sequential module method to establish a static energy model. Ghodbanan et al (Ghodbanan et al 2017; simulated the drying process of fluting paper and optimized the operating parameters, such as paper dryness and exhaust air humidity based on a nonlinear programming method. Anders et al (Ottosson et al 2017) proposed a paper drying process model that can predict the evaporation load of the drying process under different yields.…”