The vertical falling film evaporator is widely used in various fields of modern industry. And its reasonable design and efficient application is of great significance to energy saving and environment protection. Combining with engineering design, this paper summarizes the characteristics of vertical falling film evaporator, its heat transfer characteristics and design considerations. And this provides suggestions for practical engineering design.

The modal analysis of four towers (Example 1st to 4th) in "NB/T 47041 standard interpretation and calculation example" is carried out with the finite element software ANSYS. The results show that the error between the numerical solution of ANSYS and the methods in standard NB/T 47041 is very small for the towers with no change or little change in section characteristics (Example 1, 3 and 4). And for the towers with big change in section characteristics (Example 2), the accuracy of the lumped mass method and matrix iteration method is subject to the number of sections and the numerical solution is more accurate.

This paper mainly introduces some typical engineering problems involved in lifting which are difficult to consider thoughtfully in the design of lifting lugs, including lifting weight estimation, setting of the location of lifting lugs and the structural form of lifting lugs when implementing integral lifting of the equipment. Meanwhile, the paper draws on the professional advantages of general contract management modes for integrated hoisting of several large domestic petrochemical and refining projects. It discusses the design and division of work for lifting lugs from the perspective of improving lifting efficiency and quality.

With the advancement of science and technology and the update of the design and construction standards of spherical tanks, some of the spherical tank design systems developed at early stage cannot adapt to today's computer environment and production needs. Therefore, based on the actual spherical tank design process and computer-aided technology and according to the current spherical tank design standards, C# is selected as the programming language and .NET as the development platform. Then guided by object-oriented programming ideas, a set of modular design system for spherical tanks that can be applied to today's computer environments is developed based on current standards and design processes for spherical tank design with the application of AutoCAD and ANSYS as supporting software. The system can improve the accuracy of the spherical tank design, shorten the design time and reduce the complexity of the design effectively. It can also provide a basis for further research and development of similar systems.

Combining with the trend of large-scale development of domestic cryogenic tank projects, this paper points out the development direction of the gradual upsizing of BOG compressor which is the key equipment for BOG processing. Starting with analyzing the using conditions, the paper analyzes the necessity of low temperature reciprocating structure as the first choice for BOG compressor. It also compares and analyzes the horizontal balance type and vertical labyrinth type reciprocating compressor from many aspects and makes further discussion on type selection and optimization. Finally, combining with the start-up process and flow regulation scheme of BOG compressor, type selection of the compressor is further optimized from the perspective of process operation, which provides strong support for the smooth start-up and stable and reliable operation of the compressor unit.

Many key technologies involving double cylinder, precooled tilting bearing, compact and quickly assembled and quickly disassembled ending-seals and flexible supporting structure and so on are applied in the independent research and development of high temperature, high pressure, high rotating speed, compact and quickly assembled high back pressure steam turbine. And multiple patents authorizations have been obtained. The power output of such turbine could reach to 12000 kW; the inlet pressure and temperature could reach to 14Mpa and 540℃; the rotating speed could reach to15 000 r/min and the outlet pressure could reach to 7Mpa. Until now, the total sales power of the researched and developed, compact and quickly assembled high back pressure steam turbine has reached to 6670kw; the annual electricity saving is about 5336 million kWh; the annual economic benefit is about 4268.8 million yuan (calculated as about 8000 hours of working time and about 0.8 yuan per kWh of industrial average electricity consumption). The total energy consumption of the project converted into standard coal is about 17075.2 tce (the power discount coefficient is calculated as 320 gce/kWh). The carbon reduction emission after the conversion is about 45078.528 tCO2 (carbon emission coefficient is calculated as 2.64 tCO2/tce).

The convection section module of the heater is generally composed of non-welded joints including furnace wall, coil, intermediate tube plate, end tube plate and elbow box. The furnace walls with two-dimensional plane structure are easy to deform during transportation and hoisting process. Therefore, protection tie rods are generally added for reinforcement in engineering practice. Since there is no ready-made standard or calculation method for reference, the design and selection of the protection tie rods are usually based on experience and vary from person to person. Thus it is of greater randomness and has certain potential safety risks. This paper analyzes the impacts of various components of the module on the force of the tie rods briefly. It proposes a simplified calculation model of the tie rod force and deduces its calculation formula. Through comparing the data in the case with the simulation data, it is verified that the calculation model is of reference value in engineering application.

This paper analyzes and summarizes the whole process of complete modularized construction, transportation and installation of ethylene cracking furnace. It makes full elements comparison with on-site installation. The results indicate that complete modularized construction of ethylene plant cracking furnace is not only feasible in technical solution, but also has the advantages of shortening construction period, saving construction cost, reducing construction safety risks and controlling environmental pollution effectively. The construction method can be further optimized according to the capacity of each manufacturing plant. The complete modularized construction of cracking furnace is a new alternative construction mode.

The exporting countries always maintain a confidential attitude to the overhaul technology of imported screw compressors. Butadiene compressor is the key equipment in butadiene extraction plant of petrochemical enterprises. This paper records and summarizes the overhaul technology of butadiene screw compressor imported from Japan. It introduces the processes and technical points of the compressor during its disassembly and assembly and integral hoisting in the compressor room as well as its disintegration, inspection, replacement, assembly and test in the overhaul room. This provides theoretical basis and technical support for the related enterprises to repair similar imported screw compressors in the future.

According to the structural characteristics of hydrocarbon-steam reformer for hydrogen plant, some problems restricting the improvement of its thermal efficiency are analyzed and discussed. Some preliminary explorations and attempts are made to eliminate the air leakage in the reformer system. Special sealing structure is adopted to reduce the oxygen content in the flue gas from the reforming furnace and improve the thermal efficiency of the reformer.

According to the structure size of the flowmeter, this paper proposes a detection method of sector scanning using phased array technology. Firstly, it analyzes the impacts of probe frequency, array size, scanning mode and other factors on the detection performance of the flowmeter. Then, CIVA software is adopted to carry out sound field simulation and the optimized design parameters of phased array are obtained. Based on this, a special phased array probe is designed. Finally, welding test specimens of flowmeters containing four types of common defects including incomplete fusion, lack of penetration, crack and pores in welds are designed to carry out defect response research. And the above four major types of common defects are detected successfully, thus verifying the testing ability of the designed probe to detect different defects.

Welding is an indispensable processing technology in process equipment. For commonly used welding methods such as butt welding of pressure parts, mature non-destructive testing methods have been used for welding quality control. Yet for special welding methods such as surfacing, the applicability of commonly used non-destructive testing methods is not good. Welding quality affects the working performance and life of process equipment directly. This paper takes surfacing of sealing surface as example and proposes an advanced non-destructive testing method, namely infrared non-destructive testing (IRNDT). Meanwhile, it compares and studies the commonly used penetration testing results. Finally, based on the testing results, the paper puts forward some suggestions for improving the non-destructive testing method and timing of special welding of process equipment.

Liquefied Natural Gas (LNG) storage tanks are the most critical equipment in LNG receiving terminal. LNG storage tanks are normally full-containment storage tanks which are complex in structure, consisting of an outer tank and a 9% Ni steel inner tank. Welding of the shell plates of the inner tank is the key to the construction of LNG storage tanks. Single-sided automatic submerged arc welding is adopted for circumferential seams. However, this brings a huge amount of back gouging work and the shapes of grooves after back gouging are not standardized. Aiming at such problems, the original welding machine is renovated; back welding frame and back flux protection system are added to improve the shape of the seams at the back side and reduce the amount of back gouging work. The welding quality and efficiency is improved effectively.

This paper introduces the operation of a 3.2Mt/a continuous reforming unit with mixed feed heat exchanger replaced by spiral wounded heat exchanger in an aromatic hydrocarbon project of a company. Combined with the structural characteristics of plate heat exchanger and spiral wounded heat exchanger, the paper compares and analyzes the operating parameters before and after the replacement. And it is found that spiral wounded heat exchanger is superior in performance in such aspects as lower temperature difference at the hot end, reduced tube and shell pressure and uniform distribution of fluid at tube and shell side. This eliminates the impulse fluctuation of the shell outlet pressure and realizes a great reduction of the hydrogen-oil ratio of the reforming reaction and pressure drop of the reforming hydrogen system. And the energy saving and consumption reduction effect is remarkable.