Hualu Engineering & Technology Co.

Fengcheng, China

Hualu Engineering & Technology Co.

Fengcheng, China
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Yang X.,Hualu Engineering & Technology Co. | He L.,Beijing University of Chemical Technology
Beijing Huagong Daxue Xuebao (Ziran Kexueban)/Journal of Beijing University of Chemical Technology (Natural Science Edition) | Year: 2017

In view of the problem whereby four-span rotors vibrate excessively at the critical speed, a new type of magnetorheological (MR) damper has been designed and employed as a four-span rotor vibration control system. Its effect on the vibration of the rotors was studied in this work. Four-span rotor benches were built and MR dampers were installed on each span rotor corresponding to the original support mode. Experiments were carried out to verify the effect of vibration suppression with different currents in the damper. The results showed that the vibration of each span rotor at the critical speed can be suppressed effectively by the MR dampers, and the suppression increased with increasing current. Since the vibration of four-span rotors is usually too large around the critical speed, this causes the adjacent rotors to vibrate. A new multi-objective control method, in which the state of the damper was switched according to the speed, was constructed: at the critical speed the damper was turned on, and at lower speeds it was turned off. In this way, the vibration of the four-span rotors can be suppressed online. The results showed that the vibration of the four-span rotors was suppressed to an even greater extent by employing the dampers together with with multi-objective control system. © 2017, Editorial Board of Journal of Beijing University of Chemical Technology (Natural Science Edition). All right reserved.


Huang W.,National School of Technology | Huang W.,Hualu Engineering & Technology CO. | Li H.,National School of Technology | Wang R.,National School of Technology | And 2 more authors.
Chemical Engineering and Processing: Process Intensification | Year: 2017

In previous paper, by the thermodynamics investigation, it has been demonstrated that aldolization reaction with acetaldehyde is an effectively way to solve the puzzle of separating ethylene glycol and 1,2-butanediol mixture. In this paper, the reaction kinetics of aldolization was studied and a reactive distillation process was developed. The aldolization reactions were performed in the batch reactor under various conditions, including different temperatures, quantity of the catalyst and feed ratio. The apparent kinetics was correlated with experiment data by a pseudohomogeneous model. Based on the reaction kinetics, an applicable reactive distillation process was developed with a novel reactive distillation column. Simulations were finished by the process simulating software—Aspen Plus V7.3. The result shows that both glycols could be totally converted and their acetals could be easily separated, which shows great industrial application potential in the production of EG. © 2017 Elsevier B.V.


Zhang H.,China University of Petroleum - Beijing | Liang Y.,China University of Petroleum - Beijing | Yan X.,China University of Petroleum - Beijing | Wang B.,China University of Petroleum - Beijing | Wang N.,Hualu Engineering & Technology Co.
Journal of Petroleum Science and Engineering | Year: 2017

Settling tanks have been widely applied to water and sand separation from crude oil. At present, the related studies on the effect of water and sand separation in settling tanks mainly focus on computational simulation methods. This paper puts forward a model to simulate the settling process, which considers the heterogeneous diameter distribution of real particles and the variation of emulsion viscosity with water content. In this model, water and sand are perceived as dispersed water droplets and sand particles. By means of tracking the positions of all droplets and particles, variation of water and sand contents are obtained and influential factors of water and sand separation such as settling time, temperatures and processing capacity are analyzed. An experiment conducted in Lao Junmiao oil-field verifies accuracy of the model. Water contents were measured at every 1 m height of a settling tank under the condition of 20 °C. Compared with the experimental data, the maximum relative error of the model simulation is 9.38% while the corresponding results of Euler-Eulerian method solved by FLUENT is 33.46%, which identifies that the model is better coincident with the field production. In practical application, the model can determine the processing capacity, settling time and temperature, which are significant for enhancing separation efficiency. © 2017 Elsevier B.V.


Hui H.-G.,Hualu Engineering & Technology Co. | Yuan Z.,Hualu Engineering & Technology Co.
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2017

In Oleflex propane dehydrogenation process, the moving bed reactor and catalyst continuous regeneration were used, which had restrictive requirements for key equipment layout and piping. The characteristics of Oleflex process were discussed while the equipment layout and piping was studied under the conditions of having enough space for plant repairing and lifting. A better method was provided and complied with process requirements. At the same time the method can reduce land area used for the plant, lower the height of structural frame, decrease construction difficulties and save project cost. © 2017, Editorial Office of "CHEMICAL ENGINEERING" (CHINA). All right reserved.


Wang H.,Hualu Engineering & Technology Co. | Chen P.,Hualu Engineering & Technology Co.
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2017

The measurement of liquid level inside the quench chamber of coal-water slurry gasifier had always difficult and annoying problem for both designers and users. The authors made comprehensive contrast and analysis of the diaphragm seal type differential pressure level-meters used in 4 plants on material selection, life circle, fault and reason. For the phenomenon of diaphragm cracking, concaving and plumping, the authors studied and analyzed the common perspectives of diaphragm being damaged by abrasion, hydrogen embrittlement, vacuum, etc. The authors brought out that the cracking of stainless-steel diaphragm was incurred by the hydrogen corrosion at weld joint, while they also found out the gilt diaphragms became concave even without any leakage when making the fault analysis. The authors raised a new perspective that the atom hydrogen both in the syngas and quench water permeated the isolating diaphragm and reacted with the silicon oil in transmitter capillary under high temperature, consequently the hydrogen silicone oil was generated and the volume of silicon oil reduced. They illustrated the concaving and plumping process of isolating diaphragm caused by CH4 which was generated by the reaction of CH3 - and hydrogen. The authors gave some advices on selection and maintenance of the isolation diaphragm. © 2017, Editorial Office of "CHEMICAL ENGINEERING" (CHINA). All right reserved.


Wang H.,Hualu Engineering & Technology Co. | Lei N.,Xi'an International University | Deng Y.,Southwest University of Science and Technology | Wang R.,Southwest University of Science and Technology
World Information on Earthquake Engineering | Year: 2015

Based on the good mechanical properties of H section steel, a kind of multilayer cold-formed thin-walled steel structure with H-type layout was designed. Elastoplastic seismic response time history calculation of the structure under different working conditions was carried out, and the displacement response, drift of story and the acceleration of top floor of the structure were analyzed. The results show that: (1)the drift angle of the structure meet the code requirements under six seismic intensities, the maximum displacement of the top floor in X-direction is 9.213mm, that in Y-direction is 5.432mm, i. e. smaller. (2) the acceleration response of the top floor is bigger than 10000mm/s2 under high intensity earthquake, and the structure shakes badly, but it is still in a safe state without the plastic deformation; comprehensive analysis results persent that, the multilayer cold-formed thin-walled steel structure with H layout has good seismic resistance capasity, and it is suggested to consider the use of this kind of plane layout for engineering. ©, 2015, Science and Technology Periodical Press. All right reserved.


Hu H.,Fuzhou University | Jiang B.,Fuzhou University | Wu H.,Hualu Engineering & Technology Co. | Zhang J.,Fuzhou University | Chen X.,Fuzhou University
Journal of Environmental Radioactivity | Year: 2016

In this work, a biochar was prepared from bamboo (Acidosasa edulis) shoot shell through slow pyrolysis (under 300–700 °C). Characterization with various tools showed that the biochar surface was highly hydrophobic and also had more basic functional groups. Batch sorption experiments showed that the biochar had strong sorption ability to perrhenate (a chemical surrogate for pertechnetate) with maximum sorption capacity of 46.46 mg/g, which was significantly higher than commercial coconut shell activated carbon and some adsorbents reported previously. Desorption experiments showed that more than 94% of total perrhenate adsorbed could be recovered using 0.1 mol/L KOH as a desorption medium. Pearson correlation analysis showed that the recovery of perrhenate by the biochars was mainly through surface adsorption mechanisms involving both high hydrophobicity and high basic sites of biochar surface. © 2016 Elsevier Ltd


PubMed | Hualu Engineering & Technology Co. and Fuzhou University
Type: | Journal: Journal of environmental radioactivity | Year: 2016

In this work, a biochar was prepared from bamboo (Acidosasa edulis) shoot shell through slow pyrolysis (under 300-700C). Characterization with various tools showed that the biochar surface was highly hydrophobic and also had more basic functional groups. Batch sorption experiments showed that the biochar had strong sorption ability to perrhenate (a chemical surrogate for pertechnetate) with maximum sorption capacity of 46.46mg/g, which was significantly higher than commercial coconut shell activated carbon and some adsorbents reported previously. Desorption experiments showed that more than 94% of total perrhenate adsorbed could be recovered using 0.1mol/L KOH as a desorption medium. Pearson correlation analysis showed that the recovery of perrhenate by the biochars was mainly through surface adsorption mechanisms involving both high hydrophobicity and high basic sites of biochar surface.


Patent
Xuzhou Southeast Polysilicon R&D LTD and Hualu Engineering & Technology Co. | Date: 2010-04-28

The present invention relates to an improved process and apparatus for the preparation of trichlorosilane and polycrystalline silicon. During the preparation of polycrystalline silicon, trichlorosilane is prepared by hydrochlorination, comprising a) heating metallurgical silicon to a temperature of 300-500 C in a powder drying furnace followed by putting it into a reactor; b) gasifying and heating silicon tetrachloride with an external heater to form silicon tetrachloride gas of a temperature of 160-600 C; c) preheating hydrogen chloride gas to a temperature of 150-300 C with the external heater; d) preheating hydrogen gas to a temperature of 300-600 C with a heater; and e) introducing gases from steps b), c) and d) into the reactor with a hydrogen to silicon tetrachloride molar ratio of about 1: 1 to 5: 1 and a hydrogen chloride to silicon tetrachloride molar ratio of about 1: 1 to 1: 20, the reactor being kept at a temperature of about 400-600 C and under a pressure of about 1.0-3.0 MPa. The process of the present invention can cost-effectively prepare polycrystalline silicon suitable for use in semiconductor industry and solar cells.


Wu Y.-Y.,Hualu Engineering & Technology Co. | Wu H.-X.,Hualu Engineering & Technology Co. | Qu Y.-L.,Hualu Engineering & Technology Co.
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2015

The extractive distillation process in dividing-wall column of hydrogen chloride recycling in dilute hydrochloric acid was put forward and established. The simulation and optimization on the process were conducted by using Aspen Plus simulation software, with concentrated sulfuric acid as extractant. The optimization result is as follows: dividing-wall column theoretical plate number 42, feed stage 16, extractant feed stage 3, and reflux ratio 1.5. Under this condition, the simulation of extractive dividing wall column was carried out. On the premise of satisfying the requirements of separation, compared with conventional extractive distillation process, the reboiler duty of such process is reduced by 14.2% and condenser duty is reduced by 15.4%. The extractive distillation process in dividing-wall column can reduce energy consumption, thus saving the equipment investment and operation cost as well. © 2015, Editorial Office of Chemical Engineering (China). All right reserved.

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