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    Home > Coatings News > Paints and Coatings Market > Container manufacturing VOCs emissions have standard governance techniques to treat the disease

    Container manufacturing VOCs emissions have standard governance techniques to treat the disease

    • Last Update: 2021-01-14
    • Source: Internet
    • Author: User
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    China Coatings Online News
    "Existing projects will implement the I. time limit from July 1, 2016 to June 30, 2017, and the second time period limit from July 1, 2017, and the new project will implement the second time period limit from July 1, 2016. "Recently, Guangdong Province officially issued the "Volatile Organic Emissions Standard for Container Manufacturing" (hereinafter referred to as the "Standard"), which clearly defines VOCs emissions in container manufacturing. "This is the first local standard for VOCs emissions in Guangdong's container manufacturing industry and the first in the country," said Liao Chenghao, deputy director of the Institute of Atmospheric Research at the Guangdong Institute of Environmental Sciences.
    (See all pictures online of China Paint News)
    Container manufacturing VOCs emissions have standard governance technology to treat the problem Container manufacturing industry is VOCs emissions
    Guangdong is a large container manufacturing province, container design output of about 1.5 million TEU (international standard box units), the actual output of about 1 million TEU, production has long been among the forefront of the country. Data show that in 2013, China's metal container industry output reached 102.7386 million cubic meters, of which Guangdong with production of 36112628.3 cubic meters (35.15%) ranked first.
    container coatings used in the manufacture of containers are mainly solvent-based coatings, while the use of coatings also need to add at least 10% to 20% of the diluent (the main components are toluene, xylene), so a large number of VOCs will be produced.
    According to industry estimates, the production of 20-foot standard cabinet (volume of 5.9 meters ×2.35 meters ×2.39 meters) of paint use of about 100 kg (without diluents), in addition to the need to add about 20% of the diluent. Research by Guangdong Environmental Science Research Institute shows that, for example, the production of a standard 20-foot container coating is 76 to 100 kg, and contains 10 to 12 kg of thinners, a total of 86 to 112 kg, VOCs emissions of 47 to 69 kg; The use of standard 40-foot container coatings is 140 to 180 kg, and the amount of diluents is 18 to 21 kg, the total amount of VOCs is 158 to 200 kg, and the emissions of VOCs are 86 to 110 kg, accounting for about 55% of the amount of coatings and thinners.
    the above estimates, according to all container manufacturing enterprises in Guangdong Province design capacity estimates, the province's container manufacturing VOCs emissions of about 72,000 to 105,000 tons. According to the actual production capacity estimate in 2013, voCs emissions from container manufacturing industry in the province are about 65,000 to 95,000 tons.
    container manufacturing industry is a big emitter of VOCs, there are no specific emission standards for the industry. "Our province's Atmospheric Pollutant Emission Limits (DB44/27-2001) set emission limits for several VOCs. In accordance with the provisions of the environmental standard management measures, industries that do not have industry emission standards shall implement comprehensive pollutant emission standards. "Because there are no industry emission standards, emissions from the container manufacturing industry are currently managed only in accordance with the Atmospheric Pollutant Emission Limits (DB44-27-2001), which is not conducive to effective control of its VOCs emissions," Liao said. The formulation of this standard is a powerful means to improve the environmental standard system of our province and improve the management capacity of organic exhaust gas pollution control in container manufacturing industry. The
    first and second phases of Guangdong's Pearl River Delta Clean Air Action Plan also explicitly require that industrial VOCs emission control be fully implemented and that VOCs emission control standards be formulated for key industries, including containers and other industries. The Opinions on Strict Control of Volatile Organic Matter (VOCs) Emissions from Industrial Enterprises in the Pearl River Delta Region also put forward the steps to promote VOCs pollution control in the Pearl River Delta region, and called for the speedy introduction of standards for the discharge of volatile organic pollutants from key industries.
    " In order to improve the quality of the atmospheric environment in our province, improve the construction of environmental standards system in our province, improve the container manufacturing VOCs pollution control management capacity, it is very necessary to develop a specific standard for the container manufacturing VOCs control. The relevant person in charge of the Guangdong Environmental Protection Department said that the formulation of standards is also conducive to promoting the technological upgrading and progress of the entire industry, and promote the sustained and healthy development of the industry.。 VOCs have standard
    " emission standards to follow the principle of technical and economic feasibility, based on the container manufacturing industry's existing mature clean production processes and pollution control technology, to determine the standard values and related technical requirements. As one of the drafting units of the Standard, Professor Ye Daiqi of South China University of Technology said that the formulation of the Standard must pay attention to economic science, to have operability, "otherwise the standard enterprises can not be implemented, there is no point. "
    " this standard-setting, we have carried out research on the province's major container production enterprises, after in-depth analysis to determine. Liao Chenghao mentioned that, taking into account the gap between enterprises, the Standard reflects the difference between the new source and the current source, that is, the proposed emission standards for two periods, the standard from July 1, 2016 to implement existing projects by June 30, 2017 Implementation of the I. time limit, with effect from July 1, 2017, the second time period limit, "i.e. a transition period of at least one year can be modified", and the new project from the date of implementation of this Standard, the implementation of the second. time limit. "The current source standard may be wider than the new source, but it must have a deadline for meeting the standard, and after technological innovation and transformation, the new source standard should be met within the specified time."
    "Standard" respectively for container manufacturing coating production line unit area VOCs emissions, exhaust cylinder VOCs emissions, non-organized emission monitoring point concentration of three indicators to establish emission limits. Among them, the emission limit for the first phase of VOCs emissions per unit area of the container manufacturing coating production line is 200 g/m2, and the second time period is 110 g/m2. Exhaust voCs emissions mainly refer to container manufacturing and production activities, equipment or workshop exhaust cylinder emissions of volatile organic matter concentration, which provides for the first period of benzene emission limit is 1 g / square meters, toluene and xylene total 40 g / square meters, the total VOCs for 150 g / m2, the second period benzene emission limit is 1 g / m2, toluene and xylene total 20 g / square meters, total VOCs for 90 g / square meters. For the concentration of non-organized emission monitoring points, a standard is uniformly implemented, i.e. benzene is 0.1 g/m2, toluene is 108 g/m2, xylene is 1.0 g/m2, and total VOCs is 3.0 g/m2. In order to reduce the impact of emissions on the perimeter, the Standard also stipulates that the exhaust cylinder height should generally not be less than 15m, and should be more than 5m above the maximum building within a radius of 200m.
    " through our previous research found that enterprises willing to invest, seriously really carry out transformation, or can achieve the standard on time. Mr Liao said the criteria were based on full consideration of technical feasibility. In addition, the Standard also provides for the management of enterprises, the use of coatings and so on.
    the Standards, raw materials such as coatings and organic solvents should be stored in sealed containers and in specially set storage rooms. VoCs emissions should be minimized during coating and organic solvent transfer and equipment cleaning. Discarded paint drums and organic solvent container barrels should be sealed or stored in an airtight room before they are handed over to a dedicated recycling facility.
    production line that produces VOCs emissions should be set up in a confined workroom, and the resulting VOCs should be imported into volatile organic matter treatment equipment or discharge pipes through local or overall gas collection systems to meet the emission standards. Closed exhaust systems and pollution control equipment should operate in sync with process facilities. The exhaust gas collection and treatment units must operate in accordance with the specification parameters.
    enterprises should further standardize the management, for example, the use of adsorption treatment process, should be in accordance with the audited design documents to determine the use of adsorbents and replacement cycle, the purchase of adsorption agent-related contracts, bills kept for at least three years. Using exhaust cylinders to emit VOCs from sources of pollution, enterprises should regularly test their total VOCs concentration and emissions, at least once every six months. The test report should contain the detection concentration value, hourly average, and total average. The monitoring report shall be issued by an institution accredited by the quality inspection department.The treatment technology must be the medicine for the disease
    container manufacturing industry is a typical high-consumption, high-polluting industry, container manufacturing organic exhaust emissions have a typical high wind volume, low concentration characteristics, the resulting harmful substances are mainly toluene, xylene, etc., the treatment is difficult. Now that the Standard has been issued, the emission limits have been set, and the time for meeting the emissions has been determined, how should enterprises transform it?
    " use of water-based coatings is a transformation direction. Industry insiders say that while costs may rise, water-based coatings can significantly reduce VOCs emissions. Container coatings account for about 7% to 8% of container manufacturing costs, water-based coatings are 20% to 50% more expensive than solvent-based coatings, but no thinners need to be added. Take the production of 20 feet standard container as an example, the use of coatings about 100 kg, and need to add about 20% of the thinner, coatings according to about 15 yuan / kg calculation, the use of water-based coatings will increase the cost of using enterprise coatings 300 to 500 yuan. "In the future, as water-based coating production technologies mature, the cost of use will be further reduced."
    of this transformation is to add VOCs end purification facilities. Container coating production line process is long, large air volume, primer pre-painting, substrate box spraying, intermediate paint pre-spray room, intermediate lacquer room, interior paint re-spraying, outside paint re-spraying, leveling, oven and other work places need to collect the resulting VOCs gas centrally and through a number of facilities for processing.
    technology available for VOCs exhaust gas purification from container manufacturing can be broadly divided into two broad categories, namely, recovery and destruction. Ye Daiqi mentioned that recycling is through physical methods, such as changing temperature, pressure, or the use of selective adsorbents, selective osmosis membrane and other methods to collect and separate organic gas phase pollutants, mainly adsorption, absorption, condensation and membrane separation technology. Recycled volatile organic matter can be returned to the process directly or after purification for reuse to reduce the consumption of raw materials.
    Destruction is mainly through chemical or biochemical reactions, the use of heat, light, catalysts and microorganisms to convert organic compounds into CO2 and HO2 and other non-toxic or low-toxic inorganic small molecule compounds, the main treatment techniques are combustion (direct combustion, catalytic combustion, heat storage incineration), biooxidation, photocatalytic oxidation, plasma destruction.
    Due to the wide variety of VOCs, different nature, diverse emission conditions, different purification treatment technology also has its advantages and disadvantages, so in different process conditions need to use different VOCs exhaust gas purification technology or the use of different purification treatment technology process combination.According to the research conducted by the
    Provincial Academy of Environmental Sciences, a container manufacturing plant in Guangdong uses activated carbon adsorption-vapor de-attachment-solvent recovery process to treat and recover organic solvents in the container coating production process, and design solvent recovery rate of up to 90%, and has achieved good economic benefits.
    The process will be discharged from the paint room containing organic solvent exhaust gas from the exhaust fan into the wind pipe, into the recovery system, through the system for filtration, cooling and other pre-treatment into a specially designed filter, removing most of the waste gas damaged activated carbon substances, exhaust gas from the high-pressure centrifugal fan pumped into the compound In the charcoal bed adsorption tank, when the organic exhaust gas passes through the activated carbon layer of the adsorption tank, the solvent molecule is adsorbed by activated carbon with high ratio surface area and high selection adsorption, and then attached to the activated carbon crevice, the gas discharged from the adsorption tank is purified gas, which can be discharged directly into the atmospheric environment.
    adsorption tank adsorption for a certain period of time, activated carbon adsorption to saturation, the system automatically into the water vapor desorption, that is, the organic exhaust gas from the activated carbon out. After the organic solvent and water vapor removed from the activated carbon surface enter the cooler and cool into a liquid, the mixed liquid enters the automatic separator and is automatically separated.
    According to experts from the Provincial Academy of Environmental Sciences, the current "fixed bed activated carbon adsorption - hot air de-attachment - catalytic combustion" process also has a better technical and economic applicability, can adapt to the container manufacturing plant organic exhaust gas wind volume, low concentration characteristics, so in the container manufacturing industry paint exhaust gas treatment field has been widely used.
    From the practice of Guangdong, the use of catalytic combustion technology, a single production line equipment investment of about 40 million yuan, operating costs of about 1000 to 2000 yuan / day; "The cost of governance is indeed relatively high, but VOCs governance has been included in the focus of atmospheric governance projects, some places began to start VOCs sewage charges, if enterprises do not actively carry out governance work, the future may face more than just cost increases." Mr Liao said.
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