Direction Analysis Of Exhaust Gas Treatment Technology For Setting Machine

< p > > a href= "http://www.91se91.com/news/" > stereotype machine < /a > what effect has been achieved in flue gas control work? What are the problems still existing? What is the direction of flue gas treatment technology for setting machine? < /p >

The effectiveness of < p > < strong > is less than /strong > /p >

< p > environmental pollution caused by exhaust gas from stereotype machine has aroused people's great concern.

In recent years, some cities in the southeastern coastal areas of China have made certain achievements in the special treatment of dyeing and finishing machines.

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< p > take Shaoxing County of Zhejiang Province as an example. Since 2006, the county has been promoting "< a href=" http://www.91se91.com/news/ > dyeing and finishing < /a > revolution ", and organized the special rectification action of the printing and dyeing machinery setting machine waste gas named" blue sky action "to achieve a major turning point from" water control "to" gas control ".

The action requires the exhaust gas purification installation installed in dyeing and finishing enterprises, and must comply with the specifications and standards of environmental protection, quality supervision, safety supervision and other departments. The exhaust gas collection rate is above 90%, the total particulate matter removal rate reaches 80%, the soot removal rate reaches 75%, and the measures for preventing and treating the two pollution of waste water and waste oil after purification are taken.

Up to now, the exhaust equipment has basically been installed in the machine, and the air quality in the region has been significantly improved.

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< p > < strong > existing problems < /strong > < /p >.

< p > the special treatment of exhaust gas from the stereotype machine has achieved some success. Because of the disadvantages of high cost and inconvenient maintenance, such as the heat recovery and flue gas treatment equipment abroad, most enterprises adopt the domestic self-developed treatment methods, including mechanical purification, wet washing, electrostatic capture and incineration purification, single technology, water / gas heat recovery electrostatic precipitation and gas / gas heat recovery spray washing method.

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Compared with the technical requirements of "effective recovery of heat energy, emission standards, stable operation and reliable operation", the existing P treatment project has some problems such as low efficiency of flue gas purification, huge potential of heat recovery and hidden dangers of fire accidents.

In addition, due to China's lack of relevant emission standards and corresponding detection methods, it is difficult to effectively implement environmental supervision on the flue gas emission from stereotypes.

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< p > < strong > safe production and stable operation < /strong > < /p >

< p > waste treatment process design and equipment modeling of stereotype machine should take full account of safety factors, prevent from happening, prevent fire and explosion accidents from the source, and attach great importance to the long term stable operation of < a href= "http://www.91se91.com/news/index_c.asp" > equipment < /a >.

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< p > < strong > safety production < /strong > < /p >

< p > dyeing and finishing machine under high temperature condition, there is a certain potential fire hazard in the process of flammable < a target= "_blank" href= "http://www.91se91.com/" > textile < /a > processing.

The exhaust gas contains a large number of flammable oil mist particles and fiber particles, which are easy to deposit in the conveying pipeline and purification equipment and block the flow of air.

When the electrostatic precipitator technology is used to purify the exhaust gas, the oil smoke particles are deposited on the electrodes to become oil dirt. It may cause a "fire" phenomenon due to the uneven electrostatic field, causing a fire accident.

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< p > < strong > stable operation < /strong > < /p >

< p > the exhaust gas purification equipment of the stereotyping machine also has hidden dangers in varying degrees. Due to the fact that the filter is not cleaned in time, the oil and grease condensing pipes are blocked, and the static electricity fires, the fire and explosion accidents occur frequently.

In addition, the exhaust gas of the stereotype machine contains very high humidity. The water condenses on the high voltage insulators, resulting in the static electricity field failure due to the creepage phenomenon and the normal operation of the equipment.

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The operation effect of the waste gas treatment equipment is affected by the factors such as the unstandardized production and installation of the equipment and installation, the untimely maintenance, the untrained operators, the unconsciousness of safety and the unimplementation of the operation and management responsibility of the enterprises, and so on.

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< p > < strong > technical direction < /strong > /p >

< p > the development of green dyeing and finishing technology and experience from home and abroad shows that < a href= "http://www.91se91.com" > dyeing and finishing machine < /a > flue gas treatment technology has the following 4 obvious development trends.

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< p > heat energy utilization and oil recovery < /p >

< p > the heat energy utilization and oil recovery in the waste gas treatment project of stereotype machine can produce significant economic benefits. It is the motive force for the enterprise to turn "passivity" into "initiative" and control the exhaust gas of the stereotype machine.

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< p > thermal energy utilization.

Setting machine is a key energy consuming equipment. Its energy consumption usually accounts for more than 40% of the total energy consumption of dyeing and finishing enterprises. It is an important part of energy saving and emission reduction in dyeing and finishing enterprises.

The setting machine has high exhaust gas temperature and large volume of gas, resulting in a large amount of energy waste directly discharged.

High exhaust gas temperature is also not conducive to subsequent purification. Efficient operation of the unit and heat recovery are essential pretreatment units for waste gas treatment.

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< p > heat exchange is used to recover some of the heat contained in the exhaust gas, resulting in good economic benefits.

The heat recovered by the water / gas heat exchanger is mostly stored in hot water. It can be used in the printing and dyeing industry. The air / gas heat exchanger is used to heat the fresh air in the exhaust gas for heat setting process. A stereotype machine can reduce fuel consumption by more than one hundred thousand yuan per year.

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< p > fat recovery.

The high temperature exhaust gas discharged from the stereotype machine contains many organic compounds, which are very harmful to human health and ecological environment. When processing chemical fiber fabrics, the exhaust gas discharged from the heat setting process has high content of high boiling point and viscous oil compounds.

In the process of exhaust gas purification, dark brown oil (commonly known as "chemical fiber oil") is separated and can be used as an industrial building membrane mold with good performance. The price is 3500~4000 yuan per ton. According to each set of machine, the waste oil 50kg can be recovered one day, which can produce tens of thousands of economic benefits in one year.

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< p > < strong > combination process and deep purification < /strong > < /p >

< p > the setting machine has complex exhaust components, often contains a large number of sub micron sticky particles. The efficiency of single conventional process is not high. It is necessary to use a combined process including high voltage electrostatic precipitator technology to conduct advanced treatment of flue gas so as to achieve good purification effect.

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< p > combination process.

Decreasing the temperature of the flue gas of the stereotype machine can make some organic compounds condensed into liquid particles from gaseous molecules, which helps to improve the efficiency of subsequent purification units.

The purification efficiency of oil fume can reach 60%~75% by means of filtration and wet cleaning. The efficiency of purification can be more than 95% by electrostatic capture and incineration.

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< p > China's flue gas treatment of stereotyped machines has gone through two stages: < a href= "http://www.91se91.com > > Machinery > /a > dust removal" simple governance "and" wet washing "oriented" standard treatment ".

There are significant differences in maintenance cycle, investment operation cost, operation simplicity and safety reliability.

Practice has proved that single process equipment is difficult to achieve the goal of effective control of waste gas.

For example, when using the wet washing method, the export flue gas not only has a large amount of lampblack, but also has more white water vapor, which still affects the health of workers and the normal life of the surrounding residents.

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< p > deep purification.

Incineration combustion has high removal efficiency for oil fume, but it is seldom used in practice because of its operation cost, simplicity of operation and safety reliability.

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< p > in the treatment technology of oil fume of various stereotypes, the high voltage electrostatic precipitator has the most obvious effect of purification, and has the advantages of high dust removal efficiency and compact structure.

The key to ensure the normal operation and stable operation of high voltage electrostatic precipitator is to correctly maintain and eliminate the hidden dangers of fire accidents, and timely clean up and mitigate the pollution of high voltage electrodes.

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