VOC Recovery Machine Application Case
VOC recovery technology has shifted from being an "environmental cost item" to a "profitable investment item" that generates real money. Through several real application cases from different industries, analyzed from the dimensions of technical routes, environmental benefits, and economic benefits, this transformation can be more clearly seen.
Case 1: Printing and Packaging Industry - From "End-of-Pipe Incineration" to "Resource Recovery"
The printing and packaging industry has a large consumption of solvents and was once the focus and difficulty point of VOC control. Now, solvent recovery technology is helping this industry make a green transition.
Benchmark case: The "first-of-its-kind" solvent recovery project in Zhejiang Longgang, which is the "first" in the entire province.
Company Background: Zhejiang Zunhao Packaging Co., Ltd. is a typical representative among the over 40,000 printing enterprises in Longgang City.
Technical solution: Adopt the advanced process of "composite rotor adsorption + nitrogen circulation desorption + multi-stage condensation". The core lies in using the "waste gas catcher" system to reduce the exhaust volume by 85% - 90%, while increasing the concentration of the waste gas to above 3 grams per cubic meter, thus creating conditions for efficient recovery in the subsequent stages.
Environmental benefits: The concentration of VOCs is stably controlled below 45 milligrams per cubic meter, which is much better than the national standard of 70 milligrams per cubic meter. At the same time, it can also reduce approximately 1,200 tons of carbon dioxide emissions annually.
Economic benefits:
Investment: Compared with traditional RTO incineration, it not only avoids the annual operating costs of several hundred thousand yuan, but also significantly reduces energy consumption.
Output: It is estimated that 400 tons of solvents can be recycled annually, with a regeneration purity of up to 99.5%. After deducting the operating costs, it can generate approximately 2 million yuan in net income for the enterprise.
Transformation significance: This project is the first successful case in the VOCs treatment of the printing industry in Zhejiang Province, shifting from "end-of-pipe incineration" to "resource recovery", marking a historic transformation of environmental protection investment from being a "cost item" to a "benefit item".
Other successful cases: Similar transformations have occurred elsewhere as well. For instance, Xinxiawei Packaging in Hunan Province, after undergoing four equipment updates and five technological upgrades, invested 25.85 million yuan to build "adsorption concentration + solvent recovery" equipment, which can save solvent costs of 5 million yuan for the company annually.
Case Two: Petrochemical Industry - From "Unorganized Emission" to "Comprehensive Control"
The "unorganized emission" of VOCs during storage and loading and unloading in the petrochemical industry is a major challenge. Large petrochemical enterprises are achieving a win-win situation of economic benefits and environmental benefits through systematic governance.
Benchmark Case: Lanzhou Petrochemical's "Full Process Oil Vapour Recovery System"
Company Background: Lanzhou Petrochemical, a large-scale refining and chemical enterprise.
Technical solution: A complete oil vapor recovery system covering the "three benzene" storage area, railway and road loading platforms, and washing station has been constructed. The pollution treatment capacity reaches 15,000 cubic meters per hour, achieving comprehensive control of all pollution sources.
Environmental benefits: After the treatment, the concentration of non-methane total hydrocarbons in the exhaust gas is lower than 20 milligrams per cubic meter, and the concentrations of benzene, toluene, and xylene are all lower than 1 milligram per cubic meter, which is far superior to the national standards.
Economic benefits: After the system is put into use, it directly generates an economic benefit of approximately 1.17 million yuan per year, which is mainly used for solvent recovery and reuse.
Transformation significance: It has provided valuable experience for the oil and gas emission control of storage and transportation systems in the same industry, and has proved the feasibility of controlling VOCs from the source and throughout the process.
