Papers by Keyword: Reactor

Abstract: Against the characteristics of the temperature in reactor such as time-delay, time-varying and difficulty to build a precise mathematical model in the chemical industry. Through the analysis of dynamic characteristics of the controlled object, the method of fuzzy-PID control was designed based on a predictive model. According to the detected temperature signal, the output deviation of the controller and the on-line identification of prediction model, this algorithm gains the predictive value which uses a generalized predictive model and the fuzzy-PID control. Then compare the predictive value with the reference trajectory to get the deviation. Finally use this deviation and the change of the deviation to optimize the PID control parameters and attain the appropriate amount of system control. The simulation results show that the fuzzy-PID control based on prediction model has strong adaptability, good robustness, control accuracy and higher practical value.

Abstract: This paper introduces several kinds of reactors for methane catalytic combustion. Furthermore, we briefly summarize and compare advantages, disadvantages, research progresses and experimental applications of fixed-bed reactor, catalytic fluidized-bed reactor, catalytic reverse flow reactor, micro-channel reactor and catalytic membrane reactor for methane catalytic combustion.

Abstract: Reactor is hard to control because it has the characteristics of time-varying, nonlinear and large time delay. There are many uncertainties in its working process. In order to improve the dynamic performance of reactor temperature control, predictive control technology was adopted in this paper. On the basis of considering the system performance requirements and uncertainties, predictive control model was established. Improved dynamic matrix control (DMC) control algorithm with system uncertainty was designed to control reactor temperature. The simulation result shows that the system has no overshoot and its steady-state error is little than 6.2645e-004. The system has stronger robust performance when uncertainty parameter of system unknown uncertainty matrix G changes. Improved predictive DMC control algorithm can make the system have better dynamic performance than PID control and meet the need of the industry productive process.

Abstract: For low effectiveness and passiveness of current monitoring of domestic web-servers, this paper presents a design of web-server monitoring system based on ACE framework, which combines with government’s website approve , and gives a detailed statement of the design of the network transmission sub-system and the choice of non-blocking I/O model based on ACE framework.

Abstract: The flow fields of the flocculators with different baffle which shape is vertical, perforated, arc and sine respectively were numerically simulated. The simulation parameters such as velocity, turbulent intensity, shaft power were compared in different types of baffled reactor. It shows that the calculated flow field matched the experiment results. Compared with the vertical baffles, the other three baffles such as perforated, arc and sine baffles, in varying degrees increased the average velocity and turbulence, and reduce energy consumption, in which the enhancement effects of sine baffles on flow field were especially prominent. In the sine baffled flocculator the average velocity and turbulent intensity was raised 2.6% and 3.8% respectively, and the shaft power was saved 5.78%. Reasonable structure of baffles can effectively resolve the problem of non-homogeneous mixture, intensify the flow field of flocculation reaction, improve flocculating effect, and reduce energy consumption.

Abstract: In our study, we tried to extend the preservative time of vegetables, and fruits to use the ethylene absorbent method, and the plasma reaction method to decrease the ethylene content of the conditions of the storage tank. In experimentation, we discovered that banana will release ethylene, and banana will be accelerated the ripening, when the ethylene was present. The ripening rate was equal to the ethylene production rate, that was a first order functional relationship of the ethylene concentration, γe=0.21C. The ethylene absorbent in the two experimental groups had removed indeed the ethylene, and had an effecting to keep fresh of the banana. In our plasma experimentation, we found that logarithmic value of the ethylene concentration(C) was direct proportion to the reaction time, and the ethylene reaction rate rp = -22.6C. In our study, the banana weight of each run of our experiment was 420 gram, and our plasma reactor can handle 45 kilogram banana because the │rp│is nearly 107 times of │re│.

Abstract: With the expansion of the grid, continuous reactive power compensation is vital for efficient operation of long transmission power lines or cables. Yunnan Electric Power Grid is planning to development saturable reactors for 500 kV long distance AC transmission lines. As the first stage of the development plan, the appropriate saturable reactor structure should be presented and verified by experiment. In this paper, different ferromagnetic materials, core structures and winding arrangements of saturable reactors are analyzed. Then, appropriate saturable reactor structure is determined by simulating calculation. Based on that, a small-scale prototype is designed and fabricated. The experimental results show that it can obtain a continuous controllable reactive power output.

Abstract: This paper provides an updated review on fast biomass pyrolysis reactors for bio-oil production in Shandong University of Technology. The technologies that were developed include horizontal entrained bed (HEB), fluidized bed (FB), down flow tuber reactor (DFTR), double concentric cylinder rotary reactor (DCCRR) and new type down flow tube reactor (N-DFTR). The patented DFTR, DCCRR and N-DFTR in China were developed based on the technology of direct heat exchange between hot solid heat carriers and biomass particles during both of the particles flowing in a mixed condition. The process and characteristics of each reactor were discussed in this topic. Contrasting to conventional reactors, the DFTR, DCCRR and N-DFTR are promising technologies due to their characteristics of high solid-liquid conversion rate, energy self-sufficient, easy operation and scaling up.

Abstract: Due to the rapid growth of energy consumption, fossil-based fuel is at the verge of extinction. Hence, the world needs new energy to substitute for the non-renewable energy resources. Various biomass resources have been discussed by virtue of the ability of generating alternative fuels, chemicals and energy-related products. To date, the utilization of biomass is mainly thermochemical conversion which involves combustion, gasification and pyrolysis. The focus, currently, is on the catalytic pyrolysis of biomass. A variety of reactors are designed and many new catalysts for the yields of liquid products and upgrading of bio-oil are investigated. Different reactors have their own unique characteristics, and fixed bed reactor is not complicated and can be controlled easily but is difficult to upsize. Fluidized bed has a good suitability for different kinds of biomass but is more complex in structure and more difficult to control. Compared with non-catalytic pyrolysis, the quality of bio-oil improves considerably in the presence of a catalyst. Different catalysts exert different effects on the upgrading of bio-oil. HZSM-5 can reduce a vast output of acid compounds and increases hydrocarbon yields. Au/Al2O3 catalyst leads to an increase of H2 yield. All the catalysts can promote the upgrading of pyrolysis products. Optimal yields and the best quality of bio-oil can be obtained by an appropriate reactor with a proper catalyst.

Abstract: Organic synthesis chemistry is a very fast-growing discipline and it plays a very important role in chemistry. With the development of organic synthetic chemistry, organic synthesis device has also made greater development. At the same time, advances of organic synthesis device further promote the development of organic synthetic chemistry. This paper describes the working principle and system architecture of organic synthesis device and takes a case of di-n-butyl phthalate (DBP). At last, I foresee great prospect for organic synthesis