This page has only limited features, please log in for full access.
Compared with limestone-based wet flue gas desulfurization (WFGD), magnesia-based WFGD has many advantages, but it is not popular in China, due to the lack of good wastewater treatment schemes. This paper proposes the wastewater treatment scheme of selling magnesium sulfate concentrate, and makes thermal and economic analysis for different concentration systems in the scheme. Comparisons of different concentration systems for 300 MW power plant were made to determine which system is the best. The results show that the parallel-feed benchmark system is better than the forward-feed benchmark system, and the parallel-feed optimization system with the 7-process is better than other parallel-feed optimization systems. Analyses of the parallel-feed optimization system with 7-process were made in 300, 600, and 1000 MW power plants. The results show that the annual profit of concentration system for a 300, 600, and 1000 MW power plant is about 2.58 million, 5.35 million, and 7.89 million Chinese Yuan (CNY), respectively. In different concentration systems of the scheme for selling magnesium sulfate concentrate, the parallel-feed optimization system with the 7-process has the best performance. The scheme can make a good profit in 300, 600, and 1000 MW power plants, and it is very helpful for promoting magnesia-based WFGD in China.
Mingwei Yan; Yuetao Shi. Thermal and Economic Analysis of Multi-Effect Concentration System by Utilizing Waste Heat of Flue Gas for Magnesium Desulfurization Wastewater. Energies 2020, 13, 5384 .
AMA StyleMingwei Yan, Yuetao Shi. Thermal and Economic Analysis of Multi-Effect Concentration System by Utilizing Waste Heat of Flue Gas for Magnesium Desulfurization Wastewater. Energies. 2020; 13 (20):5384.
Chicago/Turabian StyleMingwei Yan; Yuetao Shi. 2020. "Thermal and Economic Analysis of Multi-Effect Concentration System by Utilizing Waste Heat of Flue Gas for Magnesium Desulfurization Wastewater." Energies 13, no. 20: 5384.
In this paper, the simulation software EBSILON is used to simulate the reheat units, and the reheat temperature control mode is deeply explored. In the benchmark system, the influence of different load intermediate point temperature on the flue gas recirculation (FGR) is analyzed. Then, the effects of load, coal quality, excess air factor, and feed water temperature on FGR are studied under the premise of intermediate point temperature as design value, and the cause for FGR change is analyzed by comparing the cutoff bypass flue (CBF) system. The results show that under any load, the FGR decreases with the increase of the intermediate point temperature, while under low load, the change of the intermediate point temperature has a greater impact on the FGR rate. When the intermediate point temperature remains constant, the FGR plunge has an increase of load at low load and is almost unchanged at high load; the FGR rate of coal with low calorific value and high moisture content is low and the coal with low volatile and high ash content has great influence on reheat steam temperature; and the excess air factor and feed water temperature are inversely proportional to the flue gas recirculation rate. In the CBF system, the change trend is similar to the reference system, but under the same working condition, the FGR rate is higher than the latter.
Meng Yue; Guoqian Ma; Yuetao Shi. Analysis of Gas Recirculation Influencing Factors of a Double Reheat 1000 MW Unit with the Reheat Steam Temperature under Control. Energies 2020, 13, 4253 .
AMA StyleMeng Yue, Guoqian Ma, Yuetao Shi. Analysis of Gas Recirculation Influencing Factors of a Double Reheat 1000 MW Unit with the Reheat Steam Temperature under Control. Energies. 2020; 13 (16):4253.
Chicago/Turabian StyleMeng Yue; Guoqian Ma; Yuetao Shi. 2020. "Analysis of Gas Recirculation Influencing Factors of a Double Reheat 1000 MW Unit with the Reheat Steam Temperature under Control." Energies 13, no. 16: 4253.
The combination of municipal solid waste (MSW) incineration power generation and waste heat utilization is an effective way of resource utilization, but low temperature corrosion and ash deposition seriously restrict the waste heat utilization of waste incineration flue gas. In this study, an experimental platform was set up in a MSW incineration power plant. Through experiments, macroscopic morphology and microscopic characterization of solid particle deposition were explored, and the macroscopic effects of heat transfer deterioration and low temperature corrosion on the equipment were analyzed. It provides a basis for exploring the coupling mechanism between the complex acid gases condensation and the complex solid particles deposition. X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM) analysis were carried out on the ash samples obtained from the experiment, and the results were analyzed with the experimental phenomena and data. Through analysis, two turning points of ash deposit performance were found. The ash deposit layer was divided into three categories, and the characteristics of different ash deposit layers were described. The object of this experiment is waste incineration flue gas, which is different from coal-fired flue gas and biomass-fired flue gas in previous studies. The conclusions obtained from the experiments provide a possibility to break through the low temperature corrosion caused by the condensation of complex acid gases and the deterioration of heat transfer caused by the deposition of complex solid particles, and provides a theoretical basis for waste heat utilization of waste incineration flue gas.
Yidan Zhang; Xianliu Du; Meng Yue; Mingwei Yan; Yuetao Shi. Heat transfer and ash deposition performance of heat exchange surface in waste incineration flue gas. International Journal of Heat and Mass Transfer 2020, 155, 119691 .
AMA StyleYidan Zhang, Xianliu Du, Meng Yue, Mingwei Yan, Yuetao Shi. Heat transfer and ash deposition performance of heat exchange surface in waste incineration flue gas. International Journal of Heat and Mass Transfer. 2020; 155 ():119691.
Chicago/Turabian StyleYidan Zhang; Xianliu Du; Meng Yue; Mingwei Yan; Yuetao Shi. 2020. "Heat transfer and ash deposition performance of heat exchange surface in waste incineration flue gas." International Journal of Heat and Mass Transfer 155, no. : 119691.
The waste heat utilization of flue gas has great potential, which is an effective measure to improve the thermal economy of the unit. This paper established the coupling model of boiler system and steam turbine system and studied the influence of boiler side parameters on thermal economy of double reheat waste heat utilization under coupled steam turbine and boiler. The study concluded that boiler load, Gas Recirculation Rate, r1 and the outlet temperature of primary air in the air preheater had an impact on the thermal economy of the advanced waste heat recovery system with double reheat. The thermal economy of the advanced waste heat recovery system with double reheat increased with the increase of boiler load and Gas Recirculation Rate, and decreased with the increase of r1 and the outlet temperature of primary air in the air preheater. The maximum coal-saving capacity of the advanced waste heat recovery system compared with the reference system is 1.5%.
Guoqian Ma; Yidan Zhang; Meng Yue; Yuetao Shi. Thermal economy study on the waste heat utilization of a double reheat unit under coupled steam turbine and boiler. Applied Thermal Engineering 2020, 175, 115112 .
AMA StyleGuoqian Ma, Yidan Zhang, Meng Yue, Yuetao Shi. Thermal economy study on the waste heat utilization of a double reheat unit under coupled steam turbine and boiler. Applied Thermal Engineering. 2020; 175 ():115112.
Chicago/Turabian StyleGuoqian Ma; Yidan Zhang; Meng Yue; Yuetao Shi. 2020. "Thermal economy study on the waste heat utilization of a double reheat unit under coupled steam turbine and boiler." Applied Thermal Engineering 175, no. : 115112.
Air leakage has a substantial impact on the efficiency of rotary air preheater, and is closely related to their temperature distribution. In this paper, for a quad-sectional rotary air preheater, the coupled model of thermodynamics and air leakage is proposed and verified by the experimental results of a double reheat 1000 MW power generator unit. The air leakage of each chamber, the temperature distribution of the fluid and the matrix can be obtained by using the three-dimensional finite-difference method. On the basis of previous research, the indirect air leakage is considered in the coupled model, as well as the interaction between the heat transfer and the air leakage. The simulation results show that the total air leakage of the quad-sectional air preheater is 33.1% less than that under the tri-sectional preheater condition. Additionally, compared with the experimental results, the difference values of the air leakage rates and the maximum duct outlet temperature are 0.21% and 2.1°C, respectively, which manifest the model accuracy. The results indicate that, in comparison to previous research methods, this model can accurately obtain the temperature distribution of air preheater.
Xianliu Du; Yuetao Shi; Xueyi Wang. Coupled characterization and experimental verification of heat transfer and air leakage in a quad-sectional rotary air preheater. Applied Thermal Engineering 2019, 159, 113923 .
AMA StyleXianliu Du, Yuetao Shi, Xueyi Wang. Coupled characterization and experimental verification of heat transfer and air leakage in a quad-sectional rotary air preheater. Applied Thermal Engineering. 2019; 159 ():113923.
Chicago/Turabian StyleXianliu Du; Yuetao Shi; Xueyi Wang. 2019. "Coupled characterization and experimental verification of heat transfer and air leakage in a quad-sectional rotary air preheater." Applied Thermal Engineering 159, no. : 113923.
A thermal-state model experimental study was performed in lab to investigate the thermal performance of a wet cooling tower with different kinds of filling layout patterns under windless and 0.4 m/s crosswind conditions. In this paper, the contrast analysis was focused on comparing a uniform layout pattern and one kind of optimal non-uniform layout pattern when the environmental crosswind speed is 0 m/s and 0.4 m/s. The experimental results proved that under windless conditions, the heat transfer coefficient and total heat rejection of circulating water for the optimal non-uniform layout pattern can enhance by approximately 40% and 28%, respectively, compared with the uniform layout pattern. It was also discovered that the optimal non-uniform pattern can dramatically relieve the influence of crosswind on the thermal performance of the tower when the crosswind speed is equal to 0.4 m/s. For the uniform layout pattern, the heat transfer coefficient under 0.4 m/s crosswind conditions decreased by 9.5% compared with the windless conditions, while that value lowered only by 2.0% for the optimal non-uniform layout pattern. It has been demonstrated that the optimal non-uniform layout pattern has the better thermal performance under 0.4 m/s crosswind condition.
Ming Gao; Chang Guo; Chaoqun Ma; Yuetao Shi; Fengzhong Sun. Thermal Performance for Wet Cooling Tower with Different Layout Patterns of Fillings under Typical Crosswind Conditions. Energies 2017, 10, 65 .
AMA StyleMing Gao, Chang Guo, Chaoqun Ma, Yuetao Shi, Fengzhong Sun. Thermal Performance for Wet Cooling Tower with Different Layout Patterns of Fillings under Typical Crosswind Conditions. Energies. 2017; 10 (1):65.
Chicago/Turabian StyleMing Gao; Chang Guo; Chaoqun Ma; Yuetao Shi; Fengzhong Sun. 2017. "Thermal Performance for Wet Cooling Tower with Different Layout Patterns of Fillings under Typical Crosswind Conditions." Energies 10, no. 1: 65.
In order to study how deep we can reduce the temperature of exhaust flue gas, an experiment focusing on the combined influence of ash deposition and acid condensation on the heat transfer characteristics of the heat exchanger was carried out in a 300-MW boiler unit. An annular tube was inserted into the flue gas duct between the air preheater and the electrostatic precipitator. The water with given temperature firstly entered the inner tube and then flowed into the outer tube at the end of the inner tube. It is found that heat transfer performance drops sharply at fixed temperature range under given coal quality. The turning temperature is defined as the engineering acid dew temperature (EADT). When the inlet water temperature is under the EADT, ash sticks to the tube and is difficult to blow off, and thus the flow resistance rises. Furthermore, the corrosion can be observed obviously. From the point of economy and reliability, EADT is the limitation for flue gas heat recovery. The EADT is at least 30 °C lower than ADT calculated by traditional empirical and theoretical equations.
Yuetao Shi; Xiangyu Zhang; Fei Li; Lei Ma. Engineering acid dew temperature: the limitation for flue gas heat recovery. Chinese Science Bulletin 2014, 59, 4418 -4425.
AMA StyleYuetao Shi, Xiangyu Zhang, Fei Li, Lei Ma. Engineering acid dew temperature: the limitation for flue gas heat recovery. Chinese Science Bulletin. 2014; 59 (33):4418-4425.
Chicago/Turabian StyleYuetao Shi; Xiangyu Zhang; Fei Li; Lei Ma. 2014. "Engineering acid dew temperature: the limitation for flue gas heat recovery." Chinese Science Bulletin 59, no. 33: 4418-4425.
In order to evaluate the influence of ash deposition on heat transfer, experiments focusing on the influence of ash deposition on heat transfer are carried out in a 75t/h CFB(circulating fluidized bed) boiler unit. The test bundles are made of helical finned tubes in staggered or in-line arrangement. The fouling factor ɛ and the overall heat transfer coefficient ratio ψ are employed to evaluate the influence of ash deposition. The fitting correlations of ɛ and ψ under different flue gas velocities are obtained respectively. The experiment reveals that the fouling factor decreases and the overall heat transfer coefficient ratio increases with the rising flue gas velocity. Compared with the in-line arrangement, the staggered arrangement helps to lighten ash deposition. The fouling factors obtained from the present experiments are one-order smaller in the magnitude than the recommended values that are widely used in China at present. And the present results are of the same order as those gained from cold test with sands instead of fly ash. Compared with the existing research, the present results are more suitable for application in practice.
Yue-Tao Shi; Ming Gao; Gui-Hua Tang; Feng-Zhong Sun; Wen-Quan Tao. Experimental research of CFB ash deposition on helical finned tubes. Applied Thermal Engineering 2011, 37, 420 -429.
AMA StyleYue-Tao Shi, Ming Gao, Gui-Hua Tang, Feng-Zhong Sun, Wen-Quan Tao. Experimental research of CFB ash deposition on helical finned tubes. Applied Thermal Engineering. 2011; 37 ():420-429.
Chicago/Turabian StyleYue-Tao Shi; Ming Gao; Gui-Hua Tang; Feng-Zhong Sun; Wen-Quan Tao. 2011. "Experimental research of CFB ash deposition on helical finned tubes." Applied Thermal Engineering 37, no. : 420-429.