————— ◆ Industrial exhaust gas analysis ◆ —————      

>> Printing waste gas source

Printing waste gas is mainly the waste gas of printing ink and the waste gas of gasoline used for cleaning ink stick.

(1) A small amount of ink waste gas that is volatilized during printing. This part of waste gas has a small volatility. The main component is low-level hydrocarbons. It does not contain harmful components such as benzene and toluene. The output is calculated based on 10% of the ink consumption. a;

(2) Clean up the exhaust gas of gasoline used in ink sticks and printing plates. Volatility of gasoline is calculated based on total non-methane hydrocarbons. The amount used is only 0.6 t / a, the volatile amount is calculated as 5%, and the emission amount is 0.03 t / a. The exhaust gas emission of the project shall comply with the GB16297-96 "Integrated Emission Standard for Air Pollutants" secondary standard (the maximum allowable emission concentration of non-methane total hydrocarbons: 120mg / m3, the emission rate is 10kg / h (15m exhaust cylinder)).

>> Printing waste gas characteristics

(1) A small amount of ink waste gas that is volatilized during printing. This part of waste gas has a small volatility. The main component is low-level hydrocarbons and does not contain harmful components such as benzene and toluene. It is a non-methane total hydrocarbon organic compound produced by volatilization of ink thinner.

(2) The dust in the ink should be controlled with carbon black as the pollution factor. PM10 considers governance measures to pay attention to. If it is an oily ink, it can be considered that all organic solvents are volatilized during use, but it is only a time period.

(3) Compared with solvent-based inks, there are fewer organic solvents in offset printing inks, so the organic solvents have less volatility and less pollution to the environment. Most offset printing paper inks use an oxide film for drying or offset UV inks use UV curing to dry out a small amount of pollutants.

————— ◆   Treatment effect standard   ◆ ————— 

>> Design Principles

(1) Assist enterprises to adopt scientific and reasonable collection methods, and reduce gas volume as much as possible on the premise of achieving the collection effect.

(2) Actively and steadily adopt new technologies and new equipment, and adopt advanced and reliable pollution control technology in accordance with the status quo and management level of the enterprise, and strive to achieve stable operation, low cost, convenient management, and easy maintenance, so as to completely eliminate exhaust gas pollution and protect Environmental purpose. (2015-01-01)

(3) Properly resolve the pollutants generated during the construction and operation of the project to avoid secondary pollution.

(4) Strictly implement current national, local, and other codes, regulations, and standards on fire prevention, safety, health, and environmental protection.

(5) Select new, high-efficiency, low-noise equipment, pay attention to energy saving and consumption reduction.

(6) The overall plan layout strives to be compact, reasonably smooth, simple and practical. Minimize project occupation and construction difficulty.

(7) Strictly implement relevant national design codes and standards, and pay attention to fire protection and safety work. (GB16297-1996)

(8) Control industrial pollution in accordance with relevant national and local environmental protection laws, regulations and industrial policy requirements, and give full play to the social, environmental and economic benefits of construction projects.

>> Project scope and standards

1. Project scope  

(1) The designer is responsible for the design, manufacture, installation, commissioning of the exhaust gas treatment equipment, and the design of the relevant pipelines.

(2) The designer is responsible for training the equipment operator of the owner unit.

(3) The owner unit is responsible for the supporting public works of the project, including power supply, water vapor, compressed air, circulating cooling water, etc.

2.Technical requirements

(1) The project does not consider land acquisition and uses the original factory land, which cannot seriously affect production;

(2) Adopt mature exhaust gas treatment technology, which requires technology to be safe, reliable, and economically reasonable;

(3) The disposal of by-products should not cause secondary pollution;

(4) All equipment and materials are new;

(5) Simple observation, monitoring and maintenance;

(6) Ensure personnel and equipment safety;

(7) Save energy, water and raw materials;

>> Emission Standard

Exhaust gas emission standards implement secondary standards, refer to the "Integrated Emission Standards for Air Pollutants" (GB16297-1996) and "Emission Standards for Odor Pollutants" (GB14554-93). The exhaust gas emission standards are as follows:

————— ◆ Basis for solution customization ◆ —————  

(1) Project-related information provided by the owner

(2) Environmental Protection Law of the People's Republic of China (2015-01-01)

(3) Law of the People's Republic of China on the Prevention and Control of Atmospheric Pollution (2016-01-01)

(4) Ambient air quality standard (GB3095-2012)

(5) Decree No. 72 of the President of the People's Republic of China on the Law of the People's Republic of China on Cleaner Production Promotion

(6) "National 13th Five-Year Plan"

(7) "Integrated Emission Standard of Air Pollutants" (GB16297-1996)

(8) Emission Standard of Odor Pollutants (GB14554-1993)

(9) "Code for Environmental Protection Design of Construction Projects" (GB50483-2009)

(10) Design Code for Heating Ventilation and Air Conditioning (GB50019-2003)

(11) Code for Fire Protection of Building Design (GB50016-2014)

(12) Design Specification for Power Supply and Distribution System (GB50052-2009)

(13) "Control Standards for Emissions of Volatile Organic Compounds in Industrial Enterprises" DB13 / 2322-2016

(14) Guangzhou Puhua Environmental Technology Co., Ltd.'s comprehensive experience based on years of exhaust gas treatment project engineering and technology research and development

————— ◆ Exhaust gas system design ◆ —————      

 The printing waste gas to be treated considers the operating cost and safety. The process route of this plan is to adopt "ventilation system (fan, collection hood, pipeline) + pretreatment system (filter) + deep purification system (adsorption and desorption + catalytic combustion). "For the core process to treat this exhaust gas, the process equipment diagram is as follows:

   Ventilation system (fan, collecting hood, pipes) + pretreatment system (filter) + deep purification system (adsorption and desorption + catalytic combustion) + fan + chimney

>> Process Introduction

(1) After the exhaust gas is pretreated to remove dust and particulate matter, it is sent to the activated carbon adsorber I and II. When the activated carbon adsorber I is near saturation, the processing gas is automatically switched to the activated carbon adsorber II (the activated carbon adsorber I stops). (Adsorption operation), and then the activated carbon adsorber I is desorbed and desorbed with a hot air flow to desorb organic matter from the activated carbon. During the desorption process, the organic waste gas has been concentrated, and its concentration has been increased by several tens of times compared to the original, reaching more than 2000 ppm. The concentrated waste gas is sent to the catalytic decomposition device, and is finally discharged as CO2 and H2O.

(2) After the completion of desorption and desorption, the activated carbon adsorber Ⅰ enters the standby state. When the activated carbon adsorber Ⅱ is close to saturation, the system will automatically switch back and desorb and desorb the activated carbon adsorber Ⅱ at the same time.

(3) When the concentration of organic waste gas reaches more than 2000ppm, spontaneous combustion can be maintained in the catalytic bed without external heating. This solution not only greatly saves energy consumption, but also reduces the equipment investment because the processing capacity of the catalytic cracker requires only 1/5 (60,000 m3 / h) of the original exhaust gas treatment capacity. This solution is suitable for both continuous work and intermittent work.

—————  ◆ Cooperation Process ◆ —————     

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