The rapid development of complete sets of technology and the trend analysis of the increase of valve varieties

Release time:

2020-11-10

With the development of large and medium-sized complete sets of technologies at home and abroad, a series of new complete sets of equipment and stand-alone machines have emerged. The development of new complete sets of equipment related to valves is characterized by large-scale, high-parameterization, high-performance automation and complete sets, which are compatible with the control methods of these complete sets of equipment.

With the development of large and medium-sized complete sets of technologies at home and abroad, a series of new complete sets of equipment and stand-alone machines have emerged. The development of new complete sets of equipment related to valves is characterized by large-scale, high-parameterization, high-performance automation and complete sets, which are compatible with the control methods of these complete sets of equipment. In the past 20 years, the control methods of foreign valves have also developed greatly. In addition to general manual, motorized, electric, pneumatic, and hydraulic transmissions, the types of electro-hydraulic linkage, gas-hydraulic linkage, and automatic control valves are increasing, and there is a trend of further development.

In recent years, long-distance pipelines have developed rapidly. The main reasons are that the cost is low, which is only 1/3 of that of railway transportation; Therefore, the demand for valves for long-distance pipelines has increased significantly in recent years. The maximum unit capacity of power generation equipment is 1.3 million kW for dual-shaft thermal power units, 1.2 million kW for single-shaft thermal power units, and 1.3 million kW for nuclear power units.

Among the valves matched with these complete sets of equipment, the largest flat gate valve has a diameter of 1620mm and 2000mm; the largest butterfly valve has a diameter of 9750mm; the largest ball valve has a diameter of 3050mm, and the weight of the valve without the driving device has reached 184 tons; 9MPa.

Such as oil refining equipment. The largest refinery is 36.4 million tons/year (Virgin Islands in the Caribbean Sea), and 30 million tons/year (Venezuela). At present, there are nearly 30 refineries with an annual capacity of more than 20 million tons; the largest unit refining decompression unit has a processing capacity of 24 million tons/year, the catalytic cracking unit has reached 8.24 million tons/year, and the hydrocracking unit has reached 3.2 million tons/year Year. The large size of the device has forced the valve to become larger and larger, and the control method has also begun to develop in the direction of automation.

The economic effects of large-scale equipment can be summarized as follows: one is to improve production efficiency, the other is to reduce infrastructure investment, and the third is to reduce the consumption of raw materials and fuels. Compared with refining equipment with an annual processing capacity of 5 million tons and 1 million tons, the investment per ton of product production capacity is reduced by 50%. Compared with two 3 million tons/year refineries, a 6 million tons/year refinery has an investment of only 69% of the latter, 53% of steel consumption, 54% of land area, and 75% of production costs. The labor productivity increased to 170%.

As the automation level of complete sets of equipment is getting higher and higher, the main production process of foreign petrochemical enterprises has realized direct digital control, and some have also realized computer hierarchical control. Chemical enterprises such as synthetic ammonia ethylene, urea, synthetic fiber, synthetic rubber and synthetic plastics have generally implemented roving inspections and alarms, and some enterprises have achieved partial automatic control. At present, foreign large-scale generating sets above 200,000 kW are generally developing towards computer control; nuclear power plants are generally controlled by computers; long-distance pipeline systems are generally controlled by computers in many countries, and are equipped with microwave communication systems. The general control room only needs two or three on-duty personnel , You can monitor the working conditions of the whole line through TV.

With the improvement of various complete sets of equipment, process flow and performance, the series of foreign valves are still increasing, and many new varieties of valves have appeared in recent years. Such as: emergency shut-off valve, quick switch valve, fire damper, anti-static valve, temperature and pressure reducing valve, butterfly check valve, pressure relief valve, vacuum jacket valve, water-cooled or air-cooled valve, safety gate valve, safety cut-off valve Among them, ball valves, butterfly valves and flat gate valves are the fastest growing valve varieties in the past 20 years.

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