Safety issues in exhaust gas treatment

If treatment is carried out using adsorption, condensation, biological methods, washing methods, etc., as long as it complies with regulatory requirements, it will not lead to major safety accidents. If combustion is used, since VOCs themselves have a calorific value and can burn, combustible gases are explosive; if the gas mixture is within its explosive limit, it will explode upon contact with a flame source. Precautionary measures: 1. Establish a riot control zone, and use riot control equipment such as instruments, motors, and fans for this purpose. 2. Install flame arresters on the relevant pipeline sections. 3. Implement an automatic control, alarm, and shutdown system. This is what I know; please correct me if there are any mistakes, thank you

1 Overview: There are various methods for purifying organic waste gases, such as direct combustion and catalytic combustion. However, it is difficult to completely burn waste gases with low concentrations but high flow rates, and the residual heat generated during intermittent operations cannot be fully utilized. The activated carbon adsorption method offers distinct advantages for dealing with waste gases that have low concentrations, high flow rates, or are generated in an intermittent manner. The HXF type waste gas purification device utilizes the principle of activated carbon adsorption, and its design has been improved based on the characteristics of similar products. This device handles a large volume of air and uses pneumatic valves, making its operation and management simple and safe. 2 Scope of Use 2.1: Used in situations where benzene derivatives, esters, alcohols, ketones, aldehydes, phenols, gasoline, and similar substances are generated during painting, packaging, printing, machinery operation, chemical processing, and production processes. 2.2 Factories producing organic solvents, used in conditions of high gas flow rates and low concentrations of waste gases, or in intermittent operations where such solvents are to be recovered and reused. 3. Structure and Features of the Device: This device mainly includes components such as an adsorption tank, a condenser, a separator, an aerator, and a main exhaust fan. It is equipped with inlet and outlet valves, an automatic cooling system for detecting excessive temperature in the carbon layer, as well as an electrical control cabinet. This purification unit can be configured with a single tank or two tanks depending on the production process; for intermittent production, a single tank is generally used ； For continuous production, two adsorption tanks are used – one for adsorption and one for desorption – although both tanks can also be used simultaneously. Manual valves are installed at the air inlets and outlets of the device, ensuring simple and reliable operation. This device uses low-pressure steam as the desorption medium; a steam filter can be installed when desorbing solvents with high boiling points to increase the steam temperature. The two tanks can also be adsorbed simultaneously and desorbed at the same time, which allows the air handling capacity to nearly double; for intermittent production, this reduces investment costs and required floor space. 4 Process Flow and Principle: Activated carbon, which possesses numerous micropores and a very large specific surface area, can adsorb solvent vapors and volatile substances onto its surface through molecular attraction and capillary action. Substances adsorbed are then desorbed using steam, depending on the boiling points of those substances. When steam is used as the desorption medium, the organic solvent vapor released during desorption condenses together with water vapor in a condenser, and after separation in a separation tank, the organic solvent is recovered. The residual liquid is discharged after aeration treatment.