1. Project overview
1.1 Introduction
Shaanxi Ever-Power Transmission Co., Ltd. is owned by Shaanxi Group Co., Ltd. and Henan Zhongsha GroupLimited company to 2004 Years 9 Month 30 A Japanese joint venture to establish a professional manufacturer of various types of automobile drive shaft assemblies, belonging to ShaanxiHolding subsidiary of Automobile Group.Located in Xi’an Economic and Technological Development Zone, covering an area 59779.5 squareMeter.the company 2002 Years 9 Month pass ISO9001:2000 Quality management system approval;2008 Years 10 Month passISO/TS16949:2002 Recognized by the quality management system, with an annual output of drive shafts 30 Production capacity of more than XNUMX sets.
At present, the company’s main equipment: CNC machine tools, modular machine tools, vertical broaching machines for face gears, boring machines, grinding machinesBed, milling machine, automatic shaft welding machine, dynamic balance testing machine, coating line, high frequency, intermediate frequency electric furnace and quenching machine, Box type, pit type tempering furnace and other process equipment 183 station(set).
Advanced numerical control equipment, modular machine tools are arranged in accordance with the production line of the product process, and the transmission shaft is assembled and welded on a single axis.Line, assembly line, coating production line U The structure is closed-loop, and the logistics direction is reasonable and scientific.Dynamic balance test, ultrasonic flaw detection, magnetic flaw detection, transmission shaft test center, etc. effectively guarantee the product quality.Company qualityQuantity policy"Elaborate production of each product, sincere service to each customer, customer satisfaction is our eternal pursuit."
With economic development, my country’s environmental protection issues have become increasingly prominent.Environmental protection management departments at all levels and enterprisesBoth the body and the people have a strong awareness of environmental protection.2016 Environmental Protection Management Department of Xi’an City, Shaanxi ProvincePollution control and haze reduction work has been carried out, and the impacts of various industrial parks and industrial and mining enterprises have been affected. VOCs Proposed rectification and governanceManagement requirements.
Shaanxi Ever-Power Drive Shaft Co., Ltd. has a large amount of organic waste gas volatilized during the spray paint production process. It is currently inNo treatment of high-altitude emissions is not conducive to the health of workers and also does not meet the requirements of environmental protection management.Shaanxi BlueCommissioned by Tong Drive Shaft Co., Ltd., Shaanxi Environmental Protection Group·Shaanxi Daqin Environmental Technology Co., Ltd., through the sceneProspecting, technical exchanges, consulting design materials, and combined with the implementation experience of industrial organic waste gas treatment projects, it is proposed toShaanxi Ever-Power Drive Shaft Co., Ltd. paint workshop organic waste gas treatment engineering technical plan for environmental protection managementDepartment review, and used as the basis for the company to implement waste gas treatment projects.
1.2 Exhaust gas generation source and concentration analysis
The main production process of the painting workshop of Shaanxi Ever-Power Drive Shaft Co., Ltd. is: workpiece cleaning--Workpiece spraying--Workpiece drying---Pick up and put into storage.The spray paint exhaust gas generation area is mainly located in the spray room and the drying room.In the work pieceWhen going to the painting room, the workpiece is painted manually, which will produce part of the organic solvent volatilization and due toPaint smoke produced by overspray; the sprayed workpiece runs to the drying room, and the dry hot air in the drying room is from the airThe air heating device and the fan will form a circulating flow of indoor hot air to continuously heat the workpiece to dry the coating.The volatilization of organic waste gas will be generated during the process, in order to ensure that the drying temperature of the drying room and the concentration of indoor waste gas are safeScope, part of the hot air exhaust gas with solvent vapor needs to be exhausted.
According to the current situation of the workshop and the information provided by the owner, the main spray paint materials in the workshop are black epoxy anticorrosive enamel and epoxy paint thinner, and the annual consumption (Working day 250 Day calculation）Respectively 15.96 t 和 6.48t, organic waste gas containing toluene, xylene and other pollution factors will be generated during spraying and drying.This project has practical characteristics such as intermittent exhaust of exhaust gas and uneven distribution of exhaust gas pollutants.
The main pollution factors of paint during use are xylene and toluene, in addition to solvent gasoline, butanol, acetone and so on.The content of paint volatilized into exhaust gas during use is about the amount of paint 10%, the content of toluene and xylene in the waste gas is about 20%; and the diluent is almost completely volatilized.
At present, the paint spray room and the drying room have an air exchange system, and the organic waste gas from the spray paint is discharged through the pipeline without treatment.The dry waste gas is discharged after being treated by a small activated carbon box.After actual surveying and mapping on site, combined with painting organic waste gas designExperience, and taking into account the effectiveness of painting work and the safety of the drying room with slight negative pressure, this plan adopts the painting roomThe floor cross-sectional area method calculates the required air volume, and the design air volume is calculated as 35000 m3/hTo ensure the collection of organic waste gasEfficiency is 90% or more.
