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Abstract: In this article, we introduce the application of TUTHILL vacuum booster / dry vacuum pump package and vacuum booster / liquid ring vacuum pump package used in chemical process such as PTMEG, ABS and PS. The successful installation references show that TUTHILL vacuum pump packages have great advantage in the construction, vacuum system design and life cycle cost. Key Words: ABS PTMEG PS High Vacuum Dry Vacuum Pump Liquid Ring Vacuum Pump Vacuum Booster Vacuum Package System Energy Saving
Abstract: This article describes the successful applications of Roots vacuum pumps + dry vacuum pumps / liquid ring vacuum pumps from the United States to Hahn Group for chemical projects such as PTMEG, ABS and PS and their advantages in terms of structure, vacuum system design and lifetime cost of life. Keywords: ABS PTMEG PS high-vacuum dry-type vacuum pump liquid ring vacuum pump Roots vacuum pump vacuum unit energy-saving CLC number: TB 753 + .2
Document ID: B First, the Roots vacuum pump + dry vacuum pump unit in the application of PTMEG Tetrahydrofuran homopolyether, is a primary hydroxyl-terminated linear polyether glycol, is a low molecular weight polymer (referred to as PTMEG), room temperature Under the white, waxy solid, melted transparent, colorless liquid, Department of tetrahydrofuran (THF) by cationic ring-opening polymerization made. PTMEG is mainly used to produce polyurethane elastomer, spandex and ester ether copolymer elastomer. In 2005, the demand for PTMEG in China reached about 34000t. However, the production process of PTMEG is complicated, and the production equipment has a great influence on the product quality. In recent years, Chinese chemical companies have stepped up their investment in the construction of the PTMEG project, thus helping to make Ta Haier's vacuum pump units a success and help them succeed. The special structural design of the TACH Haier vacuum pump completely meets the needs of the PTMEG project and therefore has a vast market for chemical projects in China. Tower Haier dry vacuum pump for the third generation of vacuum pumps, the use of short runner design, the gas can be quickly discharged. Both vacuum pump and Roots pump are coated with Ni coating (20μm) + Teflon, which can fully meet the technical requirements of PTMEG. In the seal design of dry vacuum pumps, Tahaer uses a bellows mechanical seal + a triple lip seal, a Roots pump with a labyrinth seal + mechanical seal and Kalrez® as an O-ring material for zero leakage and reduced maintenance Maintenance of the link. In 2004, a famous chemical group PTMEG unit successfully tested. According to the analysis of laboratory data obtained, PTMEG product quality has reached the world advanced level. In this project, Tajikistan won the bid for its good performance in PTMEG process, competitive price, correct selection and fast customer response. It provided 11 sets of dry vacuum pump units and 6 sets of Roots Vacuum pump. In April 2005, Taheer successfully obtained orders for 4 sets of Roots vacuum pumps and dry vacuum pumps. The products will be used in the CNPC PTMEG project. The Roots pump and screw dry vacuum pump units for CNPC are shown in Figure 1 shown. Figure 1 Roots pump + screw dry vacuum pump for CNPC Screw dry vacuum pump has obvious advantages over other dry vacuum pumps, such as short gas passage and rapid gas discharge, which can reduce the possibility of accumulation of condensate and fine particles. The pump adopts a single-stage straight-through design, less agitation of the process gas, less vibration and low noise. In addition, the pump is simple in structure, less in parts and convenient in maintenance, which is also the first choice for enterprises. In short, TACH Haier's dry vacuum pump is tailor-made for the chemical industry, pharmaceutical industry, single pump pumping speed up to 2700 m3 / h, to achieve the required degree of vacuum time is short; and suitable for handling large amounts of moisture, the maximum entrainment liquid volume Up to 1.1m3 / h. Second, Roots vacuum pump + liquid ring vacuum pump unit in ABS and PS ABS resin is between a common plastic and high-performance engineering plastics thermoplastic engineering plastics are widely used in household appliances, IT industry, building materials, Automotive industry and other fields. At present, ABS production in the world after polyethylene, polyvinyl chloride, polypropylene and polystyrene, ranking fifth. ABS project can use the United States DOW Chemical Company's continuous ontology process and the traditional emulsion process. Compared with the traditional emulsion process, the continuous ontology method has the advantages of short production flow, small area, low investment, less pollution and strong economy.
Polystyrene (PS) is one of the five most versatile thermoplastic synthetic resins in the world. Because of its good mechanical properties, transparency and water resistance, chemical resistance, especially with excellent electrical insulation properties and low moisture absorption, easy processing, etc., are widely used in household appliances, electronics, packaging, construction and consumer goods Other fields. China usually adopts ATOFINA's technology package, Tajik is the stereotypes supporting the package, in the PS project Shantou Ocean, ATOFINA Sanshui, Zhanjiang New China and the United States and other companies have adopted the Ta Haier vacuum system . In the ABS project and the PS project, need to use Roots vacuum pump + liquid ring vacuum pump. ABS project processing medium for the air + nitrogen + styrene + acrylonitrile + ethylbenzene. The medium handled in the PS project is air + styrene + ethylbenzene. Due to the high toxicity of acrylonitrile and the environmental protection requirements of styrene and styrene leakage in the country, Tahlmann recommends to users that liquid ring vacuum pumps be equipped with double-ended mechanical seals and flush with API53 (see Figure 2). Figure 2 liquid ring vacuum pump configuration double-sided mechanical seal (API53 flushing method) In order to reduce the cost of life of the user life, Tahlear company to provide BlowerXpert software for system optimization, the user recommended two-stage Roots vacuum pump + liquid ring vacuum pump vacuum system optimization program , Rather than a Roots vacuum pump + liquid ring vacuum pump program. Now a famous chemical group ABS project needs Roots liquid ring vacuum unit, the operation 40000h, for example, a Roots pump (MD5518) + a single-end two-stage liquid ring pump technical solution of the overall operating costs and two Table 5 shows the overall operating costs of a Tautz pump intercooler (MD5518 / cooler / MD4009) + a double-ended, two-stage liquid ring pump. Table 1 compares the overall operating cost of the two options Pump model A Roots pump (MD5518) + a single-end two-stage liquid ring pump Liquid ring vacuum pump system (pump head imports, unit China assembly) Two Roots pump belt Inter-stage cooler (MD5518 / cooler / MD4009) + A double-ended double-stage liquid ring pump (KLRC200) Liquid ring vacuum pump system
Initial purchase cost / ten thousand yuan
(7.5 + 30 = 37.5kW) 57.6 (7.5 + 5.5 + 11 = 24 kW) Power and Electricity Cost /
Liquid ring pump chilled water cost / ten thousand yuan (2.8 yuan / m3) 127.68 (11.4 m3 / h) 56 (5.0m3 / h)
Maintenance costs / million 18 6.225
Total cost / million 285.68 183.825
It can be concluded from the table that for each 40,000h of work, the technical scheme recommended by each tower can save RMB 1,018,550 and two sets of Roots liquid ring units can save RMB 2,031,700. Chilled water price depends on the user, usually should be higher than 2.8 yuan / m3, the higher the cost of chilled water, optimize the design of the recommended technical solutions, the higher the cost savings. Third, the summary (1) According to the specific technical requirements of customers, Ta Haier experienced engineers will recommend to customers with Roots vacuum pump + dry vacuum pump unit or Roots vacuum pump + liquid ring vacuum pump unit. (2) dry vacuum pump is the future direction of vacuum technology, energy efficient and will not pollute the environment. Most vacuum pumps associated with high vacuum in the 21st century will be dry vacuum pumps. (3) A new generation of energy-efficient KINNEY dry screw vacuum pump has successfully promoted the update of vacuum technology standards in the fields of chemical industry and medicine. (4) As the only Roots pump in the United States, vacuum pumps of liquid-ring pumps, dry pumps, slide valve pumps and Taier's Roots pumps + liquid-ring pumps / dry pumps / Provides a one-stop shopping model, providing a full range of vacuum system solutions.
Author: Liu Hongjun Address: Shanghai, China, Tibet Road 18 Harbor Ring Plaza, Room 1507 Zip Code: 200001 Tel: +86 2153853369 Fax: +86 2153853365 E-mail: Danielliu@tuthill.com.cn
Related Links: Tahitill Vacuum & Blower Systems, a unit of the U.S. Tajik Group, was merged by Kinney and MD Pneumatics of the United States. Founded in 1908, Kinney was the oldest U.S.-based manufacturer of vacuum equipment and a global market leader in vacuum technology. Its invented slide valve vacuum pump was shortened to Kinney pumps by global customers and Kinney was developed for the chemical and pharmaceutical industries Of the dry vacuum pumps are updated every technical innovation vacuum pumps in these industries standards relative single-stage liquid ring vacuum pump can reach a higher degree of vacuum double-stage liquid ring vacuum pump technology level also living in the absolute leading international level. MD Pneumatics, a world-renowned manufacturer of Roots vacuum pumps and fans, offers a wide variety of material configurations including cast iron, stainless steel, cast aluminum, bronze, Hastelloy, and Ni, Cr coatings as well as Kalrez® , PTFE, Viton® and many other sealing materials and gaskets for the treatment of flammable and explosive media such as hydrogen and oxygen. It is especially suitable for the application in chemical industry, petrochemical industry and other industries.