Taking a 450t/h ultra-high-pressure circulating fluidized bed boiler (CFB) system as the object, this paper uses Thermoflex software in the modeling, conducts variable operating condition analysis, and verifies the accuracy of the process simulation by comparing the results with the actual data provided by boiler manufacturer. The model is used to analyze the influencing factors of different coal types on the CFB system, and the results of the study provide a theoretical basis for the boiler design and equipment selection and provide guidance for the actual operation of power station.

In order to study the seismic response characteristics of tower frame foundation and optimize the seismic design, the tower frame foundation of a fractionation tower in a petrochemical plant was studied, the finite element simulation results of cylindrical tower foundation were compared with the calculation results using specification empirical formula, and the reasons for the deviation were analyzed. The tower frame foundation was calculated by bottom shear method, integrated model method and framework model method respectively, the results were compared, and the deviations of the results and the reasons were summarized. The results show that the simulation calculation of the cylindrical tower foundation did not take into account the actual influence of tower internals and pipelines, the simulation results of fundamental period T1 were larger, and the seismic effect at the tower bottom was smaller. Therefore, the method of increasing wall thickness can be used to adjust the simulation calculation. The interaction between tower and frame foundation was considered in the calculation of tower frame foundation by integrated model method. The fundamental period T1 was increased and the seismic force and total bending moment at the bottom of tower were reduced compared to the results of towers. The calculation results by bottom shear method deviated from those of integrated model method, so bottom shear method is not applicable. The seismic force and overturning moment calculated by framework model method were larger, resulting in excessive internal forces and reinforcement of the framework, so optimization and adjustment is advisable. The research results provide reference for the seismic design of tower frame foundations.

After HAZOP analysis and SIL assessment, it is necessary to confirm whether the SIF loop satisfies the SIL requirements. If a specified SIL is achieved, the corresponding requirements for the probability of dangerous failure on demand (PFD) in low demand mode or the frequency of dangerous failure per hour (PFH) in high demand mode, the structural constraints and the system capabilities should be met, respectively. This article provides the calculation methods and SIL assessment criteria for the above indicators, and discusses in detail the SIL verification according to regulatory requirements.

Based on the idea of distributed dynamic optimization, differential game and direct method of numerical optimization, this paper proposes a numerical algorithm for chemical plant operation optimization based on differential game direct method. Firstly, this paper constructs the mathematical proposition of chemical plant operation optimization based on differential game theory. Next, in order to ensure the real-time convergence of the large-scale dynamic optimization problem involved in this proposition, this paper decomposes the complex large-scale minimax problem in the differential game into several simple small-scale operation optimization sub-problems that are solved alternately. After that, the orthogonal collocation method is used to discretize the decomposed operation optimization sub-problems into nonlinear programming problems, and the solver is used to solve the above nonlinear programming problems in turn until the final optimization results converge successfully. The algorithm effectively improves the real-time, convergence, accuracy and optimality of the solution to chemical plant operation optimization problem, and provides technical support for the improvement of chemical plant economic benefits.

In this paper, the influence of factors such as process parameters, leakage fault and flow regulation on the interstage pressure of reciprocating compressors is analyzed by theoretical analysis and case verification. Based on the practical situations, the active control plans of “general bypass regulation”, “step by step bypass regulation” and stepless capacity regulation system for the interstage pressure of reciprocating compressors are discussed, providing some guidance for the analysis of interstage pressure variation of reciprocating compressors.

Aromatics complex is featured by long process flow, multiple towers and multiple low-temperature heat sources for the medium at the top of towers. Currently, both foreign and domestic xylene processes regard the utilization of low-temperature heat at the top of towers as an important means to reduce energy consumption of the unit. The coordinated utilization of low-temperature heat is called "thermal integration". This article introduces and analyzes several thermal integration methods and the corresponding equipment layout ideas for xylene processes at home and abroad, concluding that the thermal integration technology for domestic processes combines the characteristics of various foreign processes instead of simply copying a certain foreign process.

This paper takes a new petrochemical project as an example to discuss two schemes for the membrane separation of slurry bed residue hydrocracking unit, providing reference for the selection of membrane separation scheme for high-pressure hydrocracking unit in the future. In Scheme A, the primary permeable gas, with a pressure of 5.50 MPaG, is sent to the first stage inlet of make-up hydrogen compressor, and the secondary permeable gas, with a pressure of 2.80 MPaG, is sent to the downstream PSA unit. In Scheme B, the primary permeable gas, with a pressure of 9.50 MPaG, is sent to the second stage inlet of the make-up hydrogen compressor, and the secondary permeable gas, with a pressure of 2.80 MPaG, is sent to the downstream PSA unit. Compared with Scheme A, Scheme B recovers pressure energy and reduces energy consumption, but has higher investment cost. While maintaining a high purity and recovery rate of primary permeable gas hydrogen, the technology with lower primary permeable gas pressure has lower technical barriers, and most of the domestic membrane separation technology can meet the requirements.

The high-alkyne exhaust gas from butadiene extraction unit is rich in vinyl acetylene, a hazardous substance, so a significant amount of butane or butene is used to dilute the exhaust gas before it is discharged to the flare system, resulting in waste of resources and greenhouse gas emissions. Through the use of selective hydrogenation technology, the alkynes and dienes in exhaust gas are hydrogenated to butene. The hydrogenated C₄ products can be used as raw materials for downstream units or sold externally. The system recovers approximately 14,368 tons of high alkyne exhaust gas per year, generating an after-tax net profit of approximately 12.06 million yuan per year. The operation of the selective hydrogenation unit reduces the emission of exhaust gas to the flare system, which is beneficial for carbon emission reduction and creates significant economic benefits.

The construction of OA system is an important guarantee for promoting the information construction and achieving the rapid development of enterprises. Based on the actual needs of a certain enterprise, it is necessary to convert the OA system from C/S structure to B/S structure. This paper discusses the process and key elements for developing OA system with B/S structure based on Lotus Domino platform, and introduces the common methods for system testing.

LDPE and EVA are both downstream polymers of ethylene plant. Currently, foreign patented technologies are mostly adopted as the mainstream production processes for both of them. EVA and LDPE polymerization plants are highly overlapped, and some LDPE plants can be switched to EVA production. With the increasing domestic demand for EVA with high VA content used in photovoltaics, coating, hot melt adhesives, solar films and other applications, multiple LDPE/EVA plants are being planned and constructed in China. This article systematically summarizes the reasons for the lag in the construction of five domestic LDPE (EVA) plants compared to the overall planning, analyzes the problems in each stage of the implementation of the projects' critical paths, and proposes some suggestions for the implementation planning of the projects, providing reference for the execution of subsequent similar construction projects and ensuring that the project implementation schedule is controllable.

 The integration of enterprise management elements, such as law, compliance, risk, internal control and system to formulate an "n-in-1" comprehensive management and control system has become a consensus to improve management efficiency. This article summarizes and refines the experience of an engineering company in the integration of law, compliance, risk, internal control and system during the establishment of a "five-in-one" management, supervision and evaluation system, and provides some constructive ideas for enterprise managers.

After nearly a century of development, the concept of product manager has been continuously introduced and successfully achieved by high-tech enterprises in fields such as technology research and development, high-end manufacturing and information technology as well as traditional enterprises in fields of steel, military and chemical industries. The current international environment is complex and severe, and the situation of the domestic circulation has prompted China's refining engineering field to rapidly move from engineering construction for traditional energy sources such as petroleum refining and petrochemicals to engineering construction in three ‘new fields’, i.e., new energy, new materials and new economy. Faced with many new challenges in research, design, manufacturing, construction and other aspects of projects in the three “new fields", this article explores the new project management concept in the three ‘new fields’ of refining projects from the perspective of product managers by referring to the management of traditional refining engineering projects.

Through the research on master data of petrochemical engineering projects, the problems of different data sources in the construction of integrated system of engineering project management have been solved. The method for establishing integrated system of project management based on master data has been explored, and the integrated management of progress detection, quality inspection and document management has been realized, achieving the automatic detection of project progress based on document deliverables, the tracking of quality status and the automatic filing of as-built documents.