Design of deep water riser insulation mold and auxiliary equipment HAN Yong 1ç‰Ÿå›½æ ‹1 é振å®2 (1. Tianhua Chemical Machinery and Automation Research and Design Institute, Lanzhou 730060, China; Changqing Oilfield Engineering Construction Office, Xi'an 710086, China) Han Yong and other deep water Design of riser insulation mold and auxiliary equipment, oil and gas storage and transportation, 2011, 30 (12): 895-898. A new type of deep water riser insulation molding process. The thermal insulation structure of the thermal insulation mold adopts a non-foamed polyurethane elastomer GSPU tube, and the hollow glass microbeads filled therein are used for heat preservation. The heat preservation mold is generally composed of an inner cavity (forming space of the heat insulating layer), an outer cavity, a heat insulating layer, an outer guard plate, a pouring port and a vent hole, and a flow passage for heating oil between the inner cavity and the outer cavity. Taking the steel pipe diameter of 273mm as an example, the design of the mold temperature control system and the related auxiliary equipment such as the base, the lifting system and the pipe end blocking device are discussed.
In recent years, the shortage of petroleum resources has become increasingly prominent, and onshore oil and gas reserves have rapidly decreased, but deepwater oil and gas reserves are considerable. It is estimated that 90% of the world's undiscovered offshore oil and gas is stored in formations with a water depth of more than 1000 m. At present, the maximum mining depth of offshore oil and gas fields has reached 3000m. In order to improve the flow properties of crude oil, it is usually necessary to take insulation measures to reduce the conveying resistance. Therefore, the design of thermal insulation of deep-water crude oil pipeline is very important.
The connection pipe between the deep sea oil outlet and the sea level oil storage platform is the deep water riser, which is an important part of the deep water crude oil transportation facility. At present, the traditional insulation pipe mainly uses isocyanate and composite polyether as the main raw materials. After the coating is formed, the weight is added to form the deep water insulation pipe. This type of insulation pipe is suitable for working conditions with water depth not exceeding 300m, and has certain limitations. Therefore, based on the previous research results, a composite polyether with isocyanate and hollow glass microbeads is used as raw material, which can be applied to deep water riser insulation mold with water depth over 300m, which has certain innovation and practical value. .
1 Insulation process and equipment requirements of deep water riser On the basis of research and analysis of foreign related anti-corrosion technology, combined with the technical status of domestic pipeline anti-corrosion technology, the process flow of deep-water riser insulation is formulated.
Deep water riser insulation process Oil and gas storage and transportation OIL At present, the relatively mature insulation structure mainly consists of two layers of polypropylene structure and glass elastomer-filled polyurethane elastomer insulation tube (GSPU, GlassSpheresPolyurethane). The GSPU tube is a non-foaming elastomer that relies on internally filled hollow glass microspheres for thermal insulation (Table 1), does not require a polyethylene protective layer, and isocyanate and composite polyether blended with hollow glass microspheres. The raw material is used at 80 ° C from the start of the reaction until the completion of the reaction until the curing time is about the deep water riser insulation. This type of insulation pipe is mainly used.
Table 1 Characteristic data of GSPU pipe for deep water riser insulation Minimum pipe diameter Maximum pipe diameter Minimum use temperature Maximum operating temperature Minimum pipe length Maximum pipe length Total heat transfer coefficient Maximum water depth Thermal conductivity According to the deep water riser insulation process, complete deep water In addition to the existing steel pipe outer wall cleaning equipment and steel pipe heating equipment, the equipment that needs to be developed includes: insulation mold, temperature control system, base and lifting system, and pipe end blocking device.
2 The design of the insulation mold is based on the steel tube with a diameter of 273mm. The main technical parameters include: steel tube length 12m, insulation layer thickness 50mm, production speed 4050min/root, mold insulation temperature 80C. The total length of the mold is based on the length of the steel tube. The appropriate margin is set to 12.5m, which is composed of the inner cavity (the molding space of the insulation layer), the outer cavity, the insulation layer, the outer guard plate, the pouring port and the vent hole, and the heating between the inner cavity and the outer cavity is performed. The flow path of the oil.
When the mold main body pressing device is used to open the heat insulating tube, a uniform polyurethane elastomer insulation layer needs to be formed on the surface of the steel tube, and the film forming requires a certain holding time, so that the operation of the steel tube into and out of the mold is simple and easy. In the line, the mold is designed as a combination of two semi-circular molds, and the steel pipe is placed in the mold and integrally molded. Since the isocyanate and the composite polyether blended with the hollow glass microbeads are all liquid, if the two semicircular molds have a poor sealing effect, leakage is likely to occur. The aluminum alloy material has lower hardness than the carbon steel material, and its own elastic deformation and shrinkage is small, which contributes to the mold sealing. Therefore, the main material of the mold is made of aluminum alloy. In addition, a conical locating pin is designed at the mold clamping position, which is evenly distributed on the edge of the lip, which can ensure the sealing of the mold and accurately position it; the whole mold adopts the molding method of step casting and re-welding. . In order to minimize the adhesion of the insulation material and the mold, the inner wall of the mold is polished, and the roughness is required to be Ral.25.
Schematic diagram of deep water riser insulation mold isocyanate and composite polyether in the process of mixing and curing, accompanied by trace gases. In order to prevent the insulation layer from being hollowed, three injection holes are designed at the bottom of the mold, and one vent hole is designed on the upper part. The injection port has a length of 0.1m and an outer diameter of 75mm. The end connected to the external injection pipe is threaded for connection. The positions of the three injection ports are: the first one is directly below the total length of the mold, the second one is located directly below the total length of the mold, and the third one is located at 4/5 of the total length of the mold. Below. During the production of the injection, the whole mold is inclined by 30° for the gas to be discharged. When the amount of the injection exceeds the position of the first injection port of the mold, the injection port is blocked, and the second injection port is selected. The third note is selected. The material port is a spare hole, which is blocked by a ball valve when not in use.
In order to ensure the heating efficiency of the mold and reduce the heat loss, the economic thickness calculation method determines the thickness of the steel pipe insulation layer, and adds a rigid polyurethane foam insulation layer with a thickness of 30 mm and a stainless steel protective layer on the outer layer of the mold to enhance the heat preservation effect of the mold. And mechanical strength.
3 temperature control system design 3.1 heating system heating system mainly includes control cabinet, circulation pump, heater, cooler, safety protection system. According to the technical requirements of the deep water riser insulation process, the deviation of the precise temperature control of the inner surface of the mold is within ±3C, and the oil bath is used for heating. The oil is selected by MF605. To avoid uneven heating of the oil, the upper and lower mold oil flow channels are respectively 10 Root oil pipe and 10 oil pipes increase the circulation of oil. According to the insulation curing time of the deep water riser insulation layer thickness of 50mm and the relevant parameters of oil heating (Table 2), the power calculation is carried out from three aspects.
Table 2 Main calculation parameters of oil bath heating power Steel pipe diameter Mold length Heat transfer oil specific heat capacity Heat transfer oil density Aluminum specific heat capacity Aluminum density Mold Initial heating temperature Mold requirement Temperature The longest heating time is the mass of the medium to be heated, kg; A/ is the mold required temperature The temperature difference from the initial temperature of the mold, C; C is the specific heat capacity of the heat transfer oil, kkg, r is the longest heating time, h. The power required to heat the oil itself: the heating power required to heat the heat transfer oil in the household 1 mold jacket and the pipeline :P2=The heating power required for the quality of the mold itself: ruler=1 Therefore, the total heating power is: kW. The thermal efficiency calculated above is 100%, and the heat loss during heating is not counted. The design is added with 0.5 times the thermal efficiency according to experience, ie The design value of the total heating power is: 57X1.5 = 85.5kW. For this reason, the actual heating power should be selected 3.2. The temperature adjustment system is based on the selection of domestic mature oil bath heating technology, in order to reduce wiring and improve the automation of the system, increase The overall PLC control.
The control panel adopts touch-type LCD panel control, which uses the page turning display mode to improve the working efficiency; synchronously adopts the isolated electrical control box to extend the service life of the appliance; and installs the temperature sensing rods at the oil outlet and the mold outlet of the heater respectively to ensure Heating accuracy.
3.3 Safety protection system In order to ensure production safety, the whole insulation system adopts total power supply over-current without fuse circuit breaker, motor reverse protection and indicator light, thermal insulation treatment, oil shortage protection and indicator light, overheat protection temperature switch, circulating pump overload A series of safety protection devices such as protection and indicator lights, abnormal alarm buzzer, anti-dry spontaneous combustion. The overload signal of each motor and the fault signal of the inverter are fed back to the PLC, and the PLC program runs to form a closed-loop control system. In the abnormal state that occurs at any time during the production process, the PLC can immediately get the corresponding alarm feedback to protect the heating equipment and reduce the accidental damage of the equipment.
4 The design structure of the base and the lifting system, the main body is welded with high-quality carbon structural steel for supporting the mold and hydraulic system. In the production process, the hydraulic system is used to tilt the base as a whole, the middle of the mold base is hinged, and two sets of lifting hydraulic cylinders are installed at a position of 2/3 of the total length of the chassis (from the rear end).
5 tube end plugging device design The main function of the pipe end plugging device has two points: First, when it is used for heat preservation production, it is used as a sealing device at both ends of the mold to avoid the China National Petroleum Corporation. SY/T4015-96 buried steel pipe rigid polyurethane foam anti-corrosion insulation layer technical standards. Beijing: Petroleum Industry Press, 1996. Engineering and Automation, now mainly engaged in the research work of pipeline anti-corrosion insulation technology.
(Continued from page 894) With the maturity of the secondary development model of GIS components, the development of component GIS will greatly expand the spatial analysis function of GIS, and make more specialized analysis modules involved in the oil and gas storage and transportation process into special components. On the GIS basic platform, the GIS platform is transformed from a “data management type†based on the storage management of oil and gas storage and transportation basic data and graphics to an “intelligent decision-making type†based on spatial analysis and auxiliary design, and makes oil and gas storage Many problems involved in the transportation process are unified and relied on the GIS platform to realize the sharing of basic data and professional knowledge, so as to carry out comprehensive analysis of oil and gas storage and transportation processes, and provide auxiliary decision support for oil and gas storage and transportation production.
(Finish)
Diamond Wire For Semiconductor Material Cutting
Diamond Wire for Semiconductor material cutting: diamond cutting wire is formed by uniformly consolidating diamond powder particles with a Mohs hardness of 10 on a high-strength steel wire substrate with a certain distribution density through a certain method. Originally used in sapphire cutting. Since 2010, diamond wire has been used in photovoltaic crystalline silicon wafer cutting, semiconductor material cutting, graphite cutting, jade cutting, magnetic material cutting, etc.
Diamond Wire For Semiconductor Material Cutting,Semiconductor Material Cutting,Semiconductor Material Cutting Wire,Diamond Wire For Semiconductor Material
Jiangyin Baoneng Precision New Material Co.,LTD , https://www.baonengwire.com