[Guess what about Haichuan Equipment] PTA key equipment, layers of internal parts

The rows of connectors on the casing are so neat, what are they for? ?

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No, it’s not a reaction process. Look at the many connecting ports.

Cooling equipment, or filtration equipment?

Is that a "mother liquor cooler"? I'm not good at PTA.

The construction team of the Fourth Construction Company arrived at the Dalian Hengli Project on July 15, 2018. After the scientific organization of the Dalian Hengli Project Department of the Fourth Construction Company and the leading demonstration role of party members and cadres, the team* As a member of the team, he worked hard and skillfully, and after 9 months of continuous hard work, he successfully completed the installation of the internal parts of the adsorption tower, two key equipment of the PX unit 1# aromatics of the Dalian Hengli Petrochemical Project. According to Liu Jinjun, the Tianjin craftsman in charge of the installation of this key equipment, the process flow and internal assembly of the No. 1 aromatic hydrocarbon adsorption tower of the Dalian Hengli Project PX unit are patented technologies designed by the French Axens company. The two No. 1 aromatic adsorption towers of the PX unit of the Dalian Hengli Petrochemical Project are currently the largest adsorption towers in the world. The diameter of the tower is 10 meters, the height of the tower is 40 meters, and the single weight of the shell is more than 630 tons. The tower is composed of 16 layers of beam structure, 15 layers of adsorbent filling beds, and 14 layers of distribution pipes. Each layer of distribution pipes is connected by 32 flexible hoses to connect the tower annular chamber and the inner grid of the tower. Each layer of the tray is made up of 16 grids. Each layer of beams consists of 2 main beams and 12 secondary beams. The 14 beams weigh 20 tons. The cross beam is located on the load-bearing bracket in the tower, and the tower tray is placed on the cross beam. The splicing gap between the tower tray is filled with ceramic fiber ropes, and then welded and fixed with gantry cards. After the distribution pipe is installed, a pressure tightness test is carried out. The internal structure is complex and the installation process is strict. The two ends of the flexible hose of each layer of distribution pipe are flanged with the annular chamber of the tower wall. The coaxiality deviation is less than 10mm. Due to the manufacturing deviation of the tower body and the installation error of the grille, the coaxiality of most distribution pipes was out of tolerance during the installation process. Nearly 50 installers had to adjust the pipe fittings on site and then reassemble and weld them, and finally met the requirements strictly inspected by foreign experts. It took 248 days of overcoming difficulties from the hoisting of the first beam to the installation of all internal parts, and finally completed the installation of the internal parts of two adsorption towers for the Dalian Hengli Petrochemical Project in a safe and high-quality manner. Since the formal installation of internal parts started on September 7, 2018, in the past 6 months, the most difficult part of the construction of the adsorption tower has been the installation of distribution pipes on each layer. Each layer has more than 30 flexible hoses. The tower is connected to the tower wall. The coaxiality of both ends of the flexible hose should not be greater than 10mm. The installation length of the flexible hose cannot be greater than 780mm and cannot be less than 730mm. In order to ensure To determine the installation dimensions, the construction staff had to install them in three stages. In the first pass, temporary gaskets were installed. After the measured dimensions were qualified, blind plates and pressure gaskets were added. If the dimensions exceeded, the pipes were cut and reassembled and adjusted before welding. The welding deformation was strictly controlled. After all the more than 30 distribution pipes were qualified, an air tightness test was carried out and the pressure was maintained for 2 hours. After the air tightness was qualified, the formal gaskets were replaced. At present, the installation and construction of the adsorption tower is coming to an end. All the employees involved in the construction have done every step of the process meticulously and with high quality. They have installed nearly 70 tons of adsorbent on each layer of the adsorption tower. They have overcome many technical difficulties and achieved the top capping of the adsorption tower, which has played a role in accelerating the construction of the Hengli Petrochemical Project.

The purpose of the adsorption separation device is to separate para-xylene from the four mixed C8 aromatic isomers (o-xylene, m-xylene, p-xylene and ethylbenzene). Since the four isomers of C8 aromatics have similar chemical structures and their physical properties, especially boiling points, are also similar, this makes the separation of C8 aromatics difficult, and it is difficult to use the usual precision distillation method. There are two industrial methods specifically used for the separation of xylene: traditional cryogenic crystallization and selective adsorption. The selective adsorption method is to use a specific molecular sieve adsorbent to selectively adsorb para-xylene in C8 aromatics, and then use a desorbent to desorb para-xylene from the adsorbent to achieve the purpose of separating para-xylene from C8 aromatics, and use a simulated moving bed adsorption tower. This method was industrialized in the early 1970s and developed rapidly due to its simple process flow and good economic benefits. Adsorption separation technology At present, the mature industrialized technologies in the world include the Parex method developed by UOP Company in the United States and the Eluxyl method newly developed by IFP. At present, IFP proposes a hybrid Eluxy1 method, which combines adsorption and crystallization technology. Adsorption separation uses an adsorption tower to concentrate paraxylene to 90% purity. It can be reduced from two adsorption towers to one adsorption tower. ； Sent to the crystallization section, crystallization can be achieved at a higher temperature, and the cost of the crystallization section is reduced. The hybrid process reduces costs compared with the independent Eluxy1, and is especially suitable for capacity expansion and transformation of existing crystallization equipment. These two selective adsorption methods are similar in principle. The difference lies in the selection of different adsorbents and desorbents, and the use of different mechanical equipment and control methods to complete the adsorption-desorption process of simulated moving beds. The newly developed Eluxyl process developed by IFP was put into operation at the 600 kt/a paraxylene unit of South Korea's Ssangyong Refining Company in December 1997. The second set of Chevron Corporation's 450 kt/a paraxylene unit was put into operation at the end of 1997. This unit uses a crystallization and adsorption separation mixing method, which can save investment and can be used for technical transformation of old equipment. Both the Parex method developed by UOP and the Eluxyl method newly developed by IFP have the same technical level and the same adsorbent performance. The industrialization experience of the Parex method is better than that of the Eluxyl method. UOP's Parex method has industrialized 75 units, while IFP's Eluxyl method has 4 units industrialized and 5 units are under construction. The Eluxyl method has no limiting factors on the scale of the equipment. The scale of the largest paraxylene unit in a single series has reached 730 kt/a.