PetroChina and Sinopec related sources said that the sharp increase in demand for domestic petrochemical products in 2009 was the result of the superposition of many factors. For example, due to the impact of the financial crisis, the price of domestic petrochemical products declined, which led to a decrease in the use of waste plastics in downstream plastics processing enterprises, and increased the use of new materials, thereby increasing the consumption of ethylene equivalent by 1.3 million tons; in 2008, the demand was reduced, not Less downstream companies drastically reduced inventory, and unexpectedly strong demand growth in 2009 caused these companies to reset their inventory, thereby increasing the ethylene equivalent consumption of 800,000 tons. In addition, the reduction in production of polyvinyl chloride by the calcium carbide process last year provided the market space for the ethylene process, thereby increasing the ethylene equivalent consumption by 1.1 million tons. It is through the combined effects of these factors that the domestic demand for ethylene, synthetic resin, and synthetic rubber increased by 27%, 19%, and 22% respectively year-on-year.

This year, although the downstream industry still maintains a good momentum of development, the rise of international trade protectionism will make it more difficult to export some downstream products in China. For example, the European Union's REACH regulations and other green and technical barriers have begun to exert force. The poor tire exports caused by the United States to China’s special security protection case will be further manifested this year. There are also anti-dumping investigations on chemical products in some countries. At the same time, some of the factors that have contributed greatly since 2009 will be weakened or even disappeared. For example, the use of used plastics will increase again, the calcium carbide process PVC utilization rate will increase, and downstream companies will no longer reset their inventory. The demand for petrochemical products slowed down. The two major groups expect that the demand for ethylene, synthetic resin and synthetic rubber will increase by only 3%, 6% and 8% this year, which is much lower than last year.

It is based on this slowdown in demand growth. Some experts are pessimistic about the price trends of the two major petrochemical products, polyethylene and polypropylene, in the second half of this year. They predict that prices will be between 8,000 and 12,000 yuan/ton, which is not only much lower than that since 2008. The highest price of 16,500 yuan, its average price is also lower than the average price from January to April this year.

The jet water pipe is part of Trailing suction hopper Dredger, work together with Suction Pipe, through suction pipe, from the seabed dredging ship, the dredging method is similar to a vacuum cleaner. Ship fitted with one or several pumps, centrifugal pumps suck up water from the sea floor and mud, into the hopper of the ship. These operations are carried out during the voyage , while digging edge flight, heading for the hopper filled to throw mud mud area, through the mud bilge cases out the door. shiploads are trailing suction hopper with its capacity to indicate the size specifications, the general compartment volume is 500 ~ 1000m3. the minimum energy of trailing suction boat under construction in water depths of about 3 conditions deepened the largest trailing suction ship up to 3 to 35 or more. this ship belongs to the trailing suction ship, dredging can be considerable in the storm at sea, navigation and throwing mud. The Jet Pipe can clean the dirty material from sea

Basic introduction

Any pipeline used to make the gas flow down the growth rate is called the nozzle, there are two kinds of commonly used in thermal power nozzle: one is the gradual shrink nozzle, the other is a convergent divergent nozzle, or Lawal nozzle.

In the jet engine, high pressure gas (or air) is converted into kinetic energy, so that the air flow in which the expansion of the acceleration of high speed outward jet to produce the reverse thrust of the component, also known as exhaust nozzle, thrust nozzle or tail nozzle. There are many types of nozzle, such as fixed or adjustable convergent divergent nozzle, convergent divergent nozzle, ejector nozzle and plug nozzle. High-speed fighter mostly adopts adjustable convergent nozzle and adjustable convergence diffusion nozzle and ejector nozzle; rocket engine fixed convergent divergent nozzle; vertical or short takeoff and landing aircraft by converting nozzle.

The ratio of total pressure at the inlet of the nozzle and the static pressure at the outlet is called the nozzle pressure ratio, the expansion ratio or the pressure ratio. Convergent divergent nozzle exit area and critical section area (the minimum cross section area of over expansion area ratio, known as the area ratio of the nozzle. When the gas stream is expanded to the static pressure of the nozzle exit exactly equal to the atmospheric pressure, known as fully expanded nozzle, its performance best when the flow in the nozzle exit static pressure is greater than the outside atmospheric pressure, said is not fully expanded nozzle, the pressure of the gas flow can not fully converted to kinetic energy. When the static pressure at the nozzle exit is lower than that of the external pressure, it is called the over expansion nozzle.

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