Application of Jet Pump Technology in Environmental Protection

With the rapid development of industrial technology, human beings have become increasingly prominent environmental issues due to the large-scale development and utilization of resources. Environmental protection has drawn more and more attention. Various academic fields have made every effort to eliminate or reduce the environmental impact on people's production and life Adverse impact, so as to improve the environment, play an environmental advantage, take a virtuous circle, the path of sustainable development, build a harmonious society for the benefit of future generations. By this, this article briefly describes a rapid development of a subject jet pump technology, and its application in environmental protection. 1 Jet pump technology Jet pump (ietpump) 1] is a fluid jet as a working medium, by the turbulent diffusion of the fluid particles, the energy and mass transfer to be pumped fluid (liquid and solid particles containing liquid) a fluid Mechanical and hybrid reaction equipment. It consists of nozzle, throat inlet, diffuser and suction chamber and other components. As there is no moving parts in the jet pump, it has the advantages of simple structure, reliable operation, easy processing, convenient maintenance and management and comprehensive utilization. In many areas of technology, the use of jet pump technology can greatly simplify the entire process and equipment, and improve its operational reliability, especially in high temperature, high pressure, vacuum, strong radiation and underwater special operating conditions, it More shows its unique superiority. At home and abroad, jet pump technology has been applied to various departments of national production and living such as water conservancy, electricity, transportation, metallurgy, petroleum, chemical industry, environmental protection, marine development, nuclear energy utilization, geological survey, aviation and aerospace. Here, this article mainly discusses the application of jet pump technology in environmental protection. 2 jet pump technology in environmental protection hydraulic jet pump as a new device in environmental protection work, more and more to show its important role. It is mainly used in the following areas. 2.1 Sewage biochemical treatment Sewage biochemical treatment through the role of microorganisms, the organic pollutants into harmless gas products (such as C02, N02, N2), liquid products (such as water) and organic matter-rich solid products (biofouling Mud), a method in which biological sludge is precipitated in a sedimentation tank and removed from the purified sewage. Biological treatment of sewage there are a variety of ways, jet aeration method is the second blast after aeration, mechanical aeration after the third aeration method. It is suitable for municipal wastewater and low concentrations of organic industrial wastewater treatment. Jet aeration device composed of liquid jet pump is a new oxygenation device, which is one of the main non-preparation technology of sewage treatment technology. The working principle of the jet aeration device is to make the air in the air diffuse Oxygen dissolved in the sewage, to decompose harmful substances in activated sludge to provide energy. Jet aeration is a new aeration technology which has the following advantages: large total mass transfer coefficient of oxygen, high oxygen utilization rate, high oxygen transfer coefficient; strong mixing and mixing coefficient; improved sludge sedimentation performance, required Aeration time is short; equipment structure is simple, easy processing, reliable, flexible operation, easy to withered; general nozzle diameter ≥ 20mm, easy to plug, easy maintenance management; oxygen fast, low power consumption, low operating costs, Small area; when using self-priming jet aerator, cancel the blower to eliminate noise pollution. As a new energy-saving and environmental protection technology, it has great promise in biochemical treatment projects such as paper industry, printing and dyeing, hospitals and urban domestic sewage. With the development of science and technology, a new type of aeration device - spontaneous self-oscillating pulse jet aerator came into being. It uses the self-excited oscillation chamber instead of the mixing tube in the existing aerator Inhalation of air and aerobic body in the self-oscillation chamber to obtain adequate mixing, mixing and oxygenation, in a pulsed flow through the special diffusion tube release. The theoretical analysis and preliminary industrial experiments show that the aerator has excellent stirring, mixing and aeration performance, and the aerosol injected from the diffuser has a strong pulse effect. The research on this device plays an important role in water saving and pollution control and will serve for environmental protection better. 2.2 Oily Wastewater Treatment In today's era of rapid economic development, oil pollution as a common pollution more and more can not be ignored, due to its large production of oily wastewater, covering a wide range, such as oil extraction, oil refining, oil Oily wastewater will be produced during the chemical, oil storage and transportation, oil tanker accident, shipping, vehicle cleaning, machinery manufacturing and food processing, which in turn will endanger the environment and ecological balance. Therefore, we should make every effort to curb its impact on the environment Pollution, the development of new products, develop new ideas for jet pump technology in oily wastewater treatment widely used, make unremitting efforts! With liquid jet jet spray flotation device composed of its basic working principle enough: the use of liquid gas Jet pump, when wastewater from high-speed jet nozzle jet, the air around the suction roll away together, the nozzle at the exit to form a vacuum zone. The air continuously inhaled into the suction chamber, with the water into the throat, the air and sewage fully mixed for energy exchange, in the turbulent state of air is cut into tiny bubbles. Mixed fluid in the diffuser down to speed, so the pressure increases, resulting in a mixture of gas and liquid compression process, and finally discharged into the flotation cell. Small bubbles floating out of the water, while the emulsified oil constantly out of the water, to achieve the purpose of degreasing. This method compared with pressurized dissolved air flotation method, it's a large amount of intake, easy to bring out the emulsified oil, the treatment effect is good. It does not need to add flocculant, to avoid secondary pollution. In addition, it has low energy consumption, small footprint, simple equipment, no moving parts, easy maintenance, safe operation and low running cost. In offshore platforms where both space and weight are limited, priority should be given to the use of jet flotation devices for the treatment of oily wastewater. The newly developed FXPl50 jet controlled closed flotation machine has the advantages of high efficiency, low energy consumption (equivalent to 50% of the impeller type), small footprint, less rotating parts (only one pump) and low operation and maintenance costs. The North Buzachi oilfield in Kazakhstan put into operation the flotation machine in May 2005 and the results show that the equipment has a good removal effect on the emulsified oil and suspended solids in water and has the advantages of high processing efficiency and high degree of automation, The mature induced air flotation equipment, the automatic control technology to achieve a closed operation and unmanned operation features conducive to social, environmental and economic harmonious development, which has broad application prospects. 2.3 Activated Sludge Circulation and Sludge Digestion Treatment In the split-type aeration aeration treatment process, the jet pump can be used for aeration tank and sedimentation tank between the activated sludge backflow, it uses the suction pump sewage as power, You can save a set of power equipment, in the sludge digestion process, it is used in the digester to stir the sludge. With the increasingly serious environmental situation, the control and management of pollutants have been urgently needed. The role of equipment in water treatment is becoming more and more important. The application of sludge pumps in water treatment has also become increasingly prominent. At the meeting of "2007 Advanced Forum on Water Technology", Professor Wang Wei of Tsinghua University Department of Environmental Science and Engineering highlighted the sludge treatment method - water-heat-dried sludge treatment technology. The result of the treatment can reduce the moisture content of the sludge to about 50%, and the total amount of sludge can be reduced by about 20% to 30% on the basis of the original amount. The effect of this technology is considerable, but what kind of sludge delivery equipment is used to transport sludge with such a large amount of solids? Belt transport is obviously undesirable, and the most direct way is to use a sludge pump to deliver it directly to In the heater. Sludge pumps, recognized as the world leader in "Sludge Pumping Systems," can pump wastewater filtration residues up to 56% solids, and even other slurries and sludges up to 80% solids. Because of its power using hydraulic drive, the structure of the poppet valve design, simple operation, strong control, smooth operation, etc., it can be applied to sewage sludge, sugar industry sludge, mining and steel industry sludge, chemical And construction of sludge and other fields. 2.4 Exhaust gas treatment and dust removal Atmospheric environment is a valuable resource for mankind to survive. The destruction of atmospheric environment resources is an irreversible process. The environmental destruction will inevitably affect the economic and social development. Control of such pollution has become a An incalculable and urgent task. Therefore, in order to protect our living environment, it is necessary to give full play to its professional advantages and to do a better job of environmental protection such as exhaust gas treatment and dust removal. The following briefly introduces the application of jet pump technology in this area. In the exhaust gas treatment, the high-temperature exhaust gas (gas) is sucked into the combustion chamber for combustion by gas injectors, and the energy is recovered for heating the charge, thereby preventing air pollution and saving energy. The use of liquid jet pump can absorb some of the factory discharge of harmful gases, such as hydroxides, hydrogen chloride, hydrogen sulfide, sulfur dioxide, methanol and carbon dioxide, the chemical gas absorption device, has been smelting, electroplating, dyeing, pharmaceutical and other industries The promotion of the use of the factory. It can also be used as a wet dust removal device, dust removal efficiency of 80% -95%, has been widely used in industrial production. 2.5 enhanced supersonic combustion Using a steady liquid jet into the supersonic flow transverse shock shock wave generated, and hydrogen fuel combustion experiments to study the effect of liquid jet on the enhanced supersonic combustion. Thus the oscillation shock generated by it can strengthen the supersonic combustion and improve the combustion efficiency. 3 jet pump technology in the environmental problems and countermeasures Any of the technologies have some limitations, jet pump technology in the application of environmental protection there are some problems. 3.1 Existing problems. In the biochemical treatment of sewage, the jet aerator with liquid jet pump as the main component is a great improvement compared with blast aeration and impeller aeration. However, with the rapid development of petroleum, chemical industry, printing and dyeing and other industrial sectors The corresponding proportion of industrial waste water is increasing day by day. However, some shortcomings of the supporting biological wastewater treatment equipment are becoming increasingly apparent: weak oxygen scavenging capacity, low power efficiency, complicated processes and high investment at one time. In the jet exposure

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