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Spray Paint Exhaust Gas Treatment Design Scheme of Suqian Tengda Electronics Co., Ltd.

作者：中环绿洲时间：2026-05-18 11:15:237次浏览

信息摘要：

Entrusting Party: Suqian Tengda Electronics Co., Ltd.

Design Institution: Zhonghuan Lvzhou (Shandong) Equipment Manufacturing Co., Ltd.

1. Project Overview

Suqian Tengda Electronics Co., Ltd. is a modern enterprise focusing on the R&D, production and sales of wires, cables and electronic products. The core business covers the manufacturing of wires and cables, converters, computer peripheral accessories, network switches, power adapters and other products, as well as goods and technology import and export business. Its products are widely used in consumer electronics, network communication and other fields, winning market recognition with stable quality.

In the production process of wire and cable connectors, power adapter shells, network set-top box shells and other products, the spray painting process is a key link to ensure product appearance and weather resistance. Solvent-based coatings are used in this process, generating a large amount of spray paint waste gas dominated by volatile organic compounds (VOCs). The main components include benzene series, esters, alcohols and a small amount of paint mist particles. The waste gas has a strong pungent odor. Direct discharge without effective treatment will not only endanger the occupational health of front-line operators and corrode production equipment, but also pollute the surrounding atmospheric environment, which is inconsistent with the enterprise production development and environmental compliance requirements. To meet the environmental protection standards of the electronic manufacturing industry and improve the operating environment, Suqian Tengda Electronics Co., Ltd. entrusts Zhonghuan Lvzhou (Shandong) Equipment Manufacturing Co., Ltd. to customize a special spray paint waste gas treatment design scheme.

2. Pollutant Analysis and Hazards

2.1 Main Pollutants

Combined with the spray painting process characteristics of Suqian Tengda Electronics Co., Ltd., the core pollutants of this project are mixed pollutants of organic waste gas and paint mist particles, which are mainly generated by solvent volatilization of coatings and paint atomization during spraying. The specific components are highly correlated with coating types and divided into three categories: first, VOCs volatilized from solvent-based coatings, mainly including toluene, xylene, ethyl acetate and isopropanol; second, paint mist particles that fail to adhere to the product surface during spraying, mainly composed of resin, pigments and fillers with particle sizes ranging from 1 to 10 micrometers; third, low-concentration benzene series and aldehyde gas generated by residual solvent volatilization during curing, mixed with trace dust.

2.2 Formation and Hazards of Pollutants

Such pollutants are mainly formed by coating atomization, solvent volatilization and curing reaction during spraying operation. Their hazards are reflected in three dimensions: human health, production safety and environmental quality, and some organic components have cumulative hazards.

2.2.1 Hazards to Human Health

Benzene series such as toluene and xylene have strong irritation. Short-term inhalation will cause dizziness, nausea, respiratory mucosal discomfort and other symptoms. Long-term exposure may damage the nervous system and hematopoietic system. Paint mist particles are easy to deposit in the lungs after inhalation, inducing occupational diseases such as pneumoconiosis. Some aldehyde components may also irritate the skin and cause allergic dermatitis, posing a continuous threat to the health of operators.

2.2.2 Production Safety and Quality Risks

Organic components such as benzene series and esters are flammable and explosive substances. When accumulating to the explosion limit in the closed space of the spray workshop, they are extremely prone to explosion and fire accidents in contact with electric sparks or high temperature of equipment. At the same time, scattered paint mist particles are easy to adhere to the product surface, causing spraying defects, increasing rework costs, and affecting product appearance quality and market competitiveness.

2.2.3 Ecological Environmental Impacts

Untreated VOCs discharged into the atmosphere will participate in photochemical reactions to form ozone pollution and aggravate haze weather. Paint mist particles settle with rainwater to pollute soil and water bodies. The strong pungent odor will also affect the living quality of surrounding residents, possibly trigger environmental complaints and damage the social image of the enterprise.

3. Design Basis and Principles

3.1 Design Basis

Environmental Protection Law of the People's Republic of China (Revised in 2015)
Atmospheric Pollution Prevention and Control Law of the People's Republic of China (Revised in 2018)
GB 16297-1996 Comprehensive Emission Standard of Air Pollutants
GBZ 2.1-2019 Occupational Exposure Limits for Hazardous Factors in Workplace Part 1: Chemical Hazardous Factors
GB 3095-2012 Ambient Air Quality Standards
HJ/T 387-2007 Industrial Waste Gas Adsorption and Purification Device
HJ 2026-2013 Technical Specification for Industrial Organic Waste Gas Treatment Engineering by Adsorption Method
GB 30799-2014 Emission Standard of Pollutants for Electronic Industry
GB 50243-2016 Code for Acceptance of Construction Quality of Ventilation and Air Conditioning Engineering
GB 50235-2010 Code for Construction and Acceptance of Industrial Pipeline Engineering
National electrical industry standards: GB 50054-2011 Code for Design of Low Voltage Power Distribution
GB 50034-2013 Standard for Lighting Design of Buildings
Technical Specification for Coating Waste Gas Treatment
Mature cases and technical data of spray paint waste gas treatment of electronic enterprises at home and abroad

3.2 Design Principles

Accurate Compliance Principle: The discharged spray paint waste gas shall strictly comply with GB 30799-2014 and GB 16297-1996 standards, in which VOCs emission concentration ≤10mg/m³, toluene + xylene emission concentration ≤1mg/m³, paint mist particle emission concentration ≤5mg/m³, meeting local environmental protection requirements simultaneously.
Graded Treatment Principle: The combined process of "paint mist pretreatment + organic waste gas adsorption" is adopted. Water spray is used to remove paint mist particles, and activated carbon adsorption is applied to purify VOCs to realize accurate treatment of different pollutants.
Safety Adaptation Principle: Considering the flammable and explosive characteristics of organic waste gas, the equipment is equipped with concentration monitoring, explosion-proof ventilation and automatic alarm system. The system operation matches the production rhythm of the spray workshop to ensure continuous and stable treatment.
Economic and High-efficiency Principle: Optimize equipment layout and process parameters, adopt activated carbon with high adsorption capacity to reduce consumable costs. The water circulation system realizes wastewater reduction, controlling operation and maintenance investment while ensuring treatment effect.

4. Design Objectives

Through the construction of a systematic spray paint waste gas treatment system, the following core objectives are achieved to build a green production system for the enterprise:

The purification efficiency of spray paint waste gas is ≥98%. After treatment, VOCs ≤10mg/m³, toluene + xylene ≤1mg/m³, paint mist particles ≤5mg/m³, which strictly comply with national and local environmental protection standards to ensure compliant exhaust emission.
A special exhaust funnel with a height of no less than 15 meters is constructed, with standardized sampling ports and online monitoring interfaces arranged to ensure sufficient high-altitude diffusion of purified waste gas and avoid impacts on the surrounding environment.
The pollutant concentration at each operating point in the spray workshop is controlled within the limit of GBZ 2.1-2019 standard, among which toluene ≤50mg/m³ and xylene ≤50mg/m³. The pungent odor is completely eliminated to improve the operating environment.
The system realizes automatic operation and intelligent monitoring with functions such as waste gas concentration over-limit alarm and activated carbon saturation early warning. The annual stable operation time is ≥8000 hours to meet the enterprise's multi-shift production demands.

5. Spray Paint Waste Gas Treatment Process Design and Description

5.1 Process Selection Basis

The spray paint waste gas of Suqian Tengda Electronics Co., Ltd. has prominent characteristics including medium VOCs concentration, paint mist particles, complex components and concentrated discharge points. The production workshop is located in the industrial park, requiring high purification efficiency, safety and convenient operation and maintenance of the waste gas treatment system. Therefore, the combined process of water spray pretreatment + activated carbon adsorption is selected for this scheme. This process is maturely applied in the electronic manufacturing and coating industries with the following core advantages:

Excellent graded treatment effect: Water spray can efficiently capture more than 95% of paint mist particles, preventing the blockage of subsequent activated carbon adsorption layer and extending the service life of filter materials. Activated carbon has high adsorption efficiency for VOCs such as toluene and ethyl acetate to ensure thorough waste gas purification.
High safety performance: Water spray can reduce the temperature and concentration of waste gas to eliminate explosion risks. The activated carbon adsorption tower is equipped with explosion-proof devices and nitrogen purging system to further improve operational safety.
Strong adaptability: The system can adjust operating parameters according to spraying operation load (such as batch production fluctuation), adapting to intermittent or continuous production modes with stable treatment performance.
Good economic efficiency: The investment cost of process equipment is controllable. The water spray system has low energy consumption. Activated carbon can be recycled and regenerated to greatly reduce operation and maintenance costs, conforming to the enterprise's economic benefit demands.

5.2 Process Flow Chart

Waste gas from spraying station → Water curtain cabinet (preliminary paint mist capture) → Closed gas collecting hood → Anti-corrosion ventilation pipeline → Water spray purification tower (in-depth paint mist removal) → Gas-liquid separator (dehydration) → Activated carbon adsorption tower → Centrifugal induced draft fan → Special exhaust funnel → Compliant discharge

Supporting System: Paint residue filtering device → Circulating water tank → Activated carbon regeneration device → Online monitoring system

5.3 Detailed Process Description

Preliminary source capture: A water curtain cabinet is installed at the spraying station to capture paint mist particles generated during spraying through flowing water film with a capture efficiency of 80%. A closed gas collecting hood is arranged above the water curtain cabinet to form local negative pressure, ensuring that all uncaptured waste gas and VOCs are collected to avoid unorganized emission.
Safe transportation and in-depth defogging: FRPP anti-corrosion ventilation pipelines are adopted for waste gas transportation with guide plates installed to reduce resistance. After entering the water spray purification tower, the waste gas fully contacts with atomized spray liquid, and paint mist particles are completely removed through inertial collision and adsorption with a defogging efficiency ≥95%. The treated gas is dehydrated by a gas-liquid separator to prevent moisture from affecting the activated carbon adsorption effect.
Core adsorption and purification: The dehydrated waste gas enters the activated carbon adsorption tower filled with columnar granular activated carbon. VOCs components are adsorbed and intercepted by activated carbon pores with a purification efficiency ≥98%. The adsorption tower adopts double-tower design, one tower for operation and the other for standby. It automatically switches when the resistance of the operating tower reaches the set value to ensure continuous treatment.
Treatment of paint residue and activated carbon: Paint residue generated by the water spray system is separated by the filtering device and disposed of by qualified institutions. Saturated activated carbon is recycled by thermal desorption regeneration equipment with a regeneration efficiency ≥85%. Waste activated carbon that cannot be regenerated is disposed of as hazardous waste in accordance with specifications.
Tail gas emission and monitoring: The purified gas is lifted to a 15-meter-high exhaust funnel for discharge by an induced draft fan. VOCs online monitoring equipment is installed on the exhaust funnel to real-timely monitor emission concentration and flow velocity. Data are synchronously uploaded to the enterprise central control room and local environmental protection platform to ensure emission compliance.

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