Selection of North Pressure Shrink Compressor Group Model Wang Xihong (Daqing Oilfield Engineering Co., Ltd.) Oil and gas field natural gas boosting application requirements, available in centrifugal and reciprocating models. Since the selection of the compressor is closely related to the amount of treatment, the trend and stability of the gas volume, and the configuration of the unit, therefore, when the gas volume is large and stable, and the compression ratio is low, the centrifugal compressor should be used without the equipment unit; Reciprocating compressor units are the best choice when small and unstable, and the compression is relatively large, and equipment units are required.
Compressor; design 1 unit design basic parameters North pressure shallow cold compressor unit design basic parameters are as follows: compressor suction pressure is 001 ~ 0 05MPa (g), compressor suction temperature is a 10C ~ 20 compressor outlet pressure is 14MPa (g ). The rated exhaust capacity of the compressor is calculated according to the compressor suction pressure of 005MPa. The total displacement of the compressor is designed to be 60X104m3/d. Under this rated capacity, the total discharge of the compressor is calculated at 003MPa(g) suction pressure. The gas volume can reach 50X104m3/d. 2 models, configuration scheme comparison and selection Table 1 is based on Shenyang Blower Factory (domestic centrifugal compressor), US COOPER company (foreign reciprocating compressor), Beijing Jingcheng Environmental Protection and Wuxi Compressor Factory ( Comparison of compressor selection and configuration schemes made by the selection scheme provided by domestic reciprocating compressors. The centrifugal compressor program adopts a single unit, the foreign reciprocating compressor adopts the 2 open 1 preparation scheme, and the domestic reciprocating compressor unit adopts the 4 open 1 standby scheme.
Plants are selected according to the different nature and function of the green space, and are reasonably configured.
A high degree of matching should be appropriate. The upper layer of Qiao and shrubs have higher branching points. When the species is small, the lower layer of ground cover plants can be appropriately higher. When the planting area is small, the lower species should be selected; the edge of the flowerbed should be selected to be lower or creepy. Will be more to set off the beauty of flowers.
Color matching should be coordinated. Plant collocation should pay attention to color changes and contrasts, with rich seasonal changes. Under the evergreen tree, plants with strong negative, bright colors and long flowering period, such as maize, can be selected.
3 Plant landscaping technology In landscaping, plants are directly related to the quality of greening and beautification. Plant landscaping is the basic means of constructing garden green space. It uses trees, shrubs, vines and herbaceous plants to create natural plant community landscapes through artistic techniques, giving full play to the natural beauty of plants' shapes, lines, textures and colors. Plant landscaping must not only grasp the ornamental characteristics of various plants (flowers, leaves, fruits, etc.), physiological and ecological habits (such as plants for light, moisture, atmosphere and soil), and rational plant allocation (such as plant species) Relationship, population density, allocation, tree mix and age structure, etc., but also pay attention to artistic techniques, rational layout and setting, so that plants can fully exert their performance in time and space, create landscapes, divide space, transform terrain, set off scenery and Creative concept and other functions. Plant landscaping is based on the premise of adapting plants to plants, gradually introducing excellent garden trees suitable for local climate, fully demonstrating the beauty and group beauty of garden plants, using plant aroma, beautification and purification to maximize the comprehensive benefits of garden green space.
4 Plant community construction techniques Plant community stability depends on spatial structure diversity, total biomass, recovery and regeneration capacity, and anti-interference levels. Multi-layer vertical configuration of trees, shrubs, ground covers and lawns should be used reasonably to improve green volume and community stability. The green space construction should take the vertical structure and horizontal structure of the green space, fully consider the photosynthetic efficiency and inter-species ecological coordination, and advocate the mixing of positive and negative, deep root and shallow root, deciduous and evergreen, coniferous and broadleaf, and form a stable, multi-layered , mixed and patchwork of ecological plant communities.
The main techniques include plant screening, mixing types, mixing methods, mixing ratios and configuration methods. At the same time, it is necessary to highlight local characteristics, strengthen the use of native tree species, introduce garden plants, pay attention to biodiversity conservation and construction, establish a green ecological network, and comprehensively improve the landscape stability and ecological benefits of urban green space systems.
Table 1 Comparison of Compressor Selection Table Comparison Project Scheme 1 (domestic centrifugal compressor) Scheme 2 (foreign large-scale reciprocating compressor) Scheme 3 (domestic small and medium-sized low-speed reciprocating compressor) scheme overview 1 domestic centrifugal compressor 3 sets of foreign imported reciprocating compressors are used for the original pressure (2 selected 5 domestic reciprocating compressors (propane refrigeration unit in the 4 open 1 shrinking plant) The propane chiller in the plant is not installed. The original unit of the new compressor plant is not moving. The compressor adopts medium speed unit, and the API- 11P standard group is used. The original position is fixed. The u compressor adopts low-speed unit, and executes API-618 standard single suction flow rate/m3d1 intake pressure/MPa (g) exhaust pressure/MPa ( g) Multi-variable efficiency / single-axis power / kW single motor power / kW average line speed / ms1 noise / dBA compressor stage instrument control system local PLC (dual redundant configuration) control, key point upload local PLC Control, key point upload drive type motor + speed increase box + compressor increase safety type motor drive compressor seal type dry gas seal packing seal lubrication method Forced lubrication cylinder and packing for oil lubrication moving parts for circulating lubrication cylinder and packing less Oil lubrication, moving parts for circulating lubrication, fuselage transmission mechanism, forced lubrication of oil pump (size X width X height) / mm installation mode double-layer installation host, auxiliary machine single-layer arrangement compressor unit overall start-up rate /% compressor structure Simple and compact, the moving parts are less horizontally balanced and more complex, the consumable parts and moving parts are more horizontally balanced and more complex, and the wearing parts and moving parts are multi-unit adaptive low flow and breathing. The problem is that the variable working conditions can adapt to multiple parallel machines, and the ability to adapt to changing working conditions is relatively poor. There is no need for regular overhaul, continuous running time is long, overhaul and daily maintenance work is heavy, and regular maintenance and daily maintenance workload is required. Smaller maintenance personnel replace the intake and exhaust valves, valve springs, piston rings, high technical requirements, lower maintenance costs, bearing bushings, packing, etc., technical requirements for maintenance personnel are not high, maintenance costs are higher, bearing bushings, packing, etc. The technical requirements of personnel are not high, and the maintenance cost is high. Beijing Jingcheng Environmental Protection: 2600 unit total quotation / Wanhao Wuxi Compressor Factory: 2250 delivery period December 13 (offshore) unit total power consumption / unit total lubricant consumption / cycle Use, only a small loss of oil lubrication unit when normal: 6 oil-free structure, less oil lubrication unit: 23 total investment of renovation project / 10,000 yuan equipment annual operating cost / 10,000 yuan equipment annual sales income / 10,000 yuan financial net present value / 10,000 Yuan over 1 If you use ad on this project because the gas volume is small, l'E pressure ratio is large, I gas lishhgHouse.Allrigh (;f holding Zhang Xiuli // can be seen from Table 1 comparison, scheme 2 foreign introduction large reciprocating compression machine The investment in the case is the highest, the device efficiency is the worst, and the delivery time is the longest. The investment in the scheme of domestic centrifugal compressor and scheme 3 domestic small and medium-sized reciprocating compressor is not much different. The economic benefit of the scheme three is slightly higher than that of scheme 1. Although Shenyang The centrifugal compressor of the blower factory has many successful application examples in the domestic refining and chemical industry. In the domestic oil and gas field, only the old Sazhong oil and gas processing plant in Daqing Oilfield was installed 20 years ago but it was not used normally. In other oil and gas fields, Unused quantity is not stable, there is no domestic machine type use and management experience, there are still certain risks. In addition, considering that the centrifugal compressor working condition is not as adaptable as the reciprocating compressor, the delivery time is also longer. Therefore, centrifugal compression is not recommended. machine.
3 Conclusions Based on the above comparison and analysis, the reform of the North Pressure Compressor Group uses domestic small and medium-sized low-speed reciprocating compressor units.
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