Process: alkali washing + water washing + defogging + regenerative incineration system (three-chamber RTO) + quenching + alkali washing + water washing
Parameters: exhaust air volume: 53000Nm3/h, exhaust gas concentration: 0-5000mg/m3, exhaust gas components: methanol, ethanol, toluene, ethyl ethyl ester, methylene chloride, acetonitrile, DMF, isopropyl alcohol and other VOCs organic exhaust gas
Description: Pharmaceutical, pesticide and fine chemical industries
Instructions for use: Party A's company was established in 2017. It is a Japanese-funded enterprise focusing on the research and development, production and sales of APIs and advanced intermediates. What our company designed and manufactured for the owner this time is a 53000nm³/h organic waste gas treatment system, which mainly treats high-concentration organic waste gas generated from five production workshops and sewage pools; the system uses pretreatment + three-tower regenerative combustion system RTO + post-processing Treatment is carried out; pretreatment adopts one-level alkali washing + one-level water washing: it mainly removes inorganic acid and alkali gases and particulate matter in the exhaust gas and some water-soluble organic waste gas in the exhaust gas; the three-tower regenerative combustion system RTO deeply removes For organic waste gas, the treatment efficiency is as high as over 99%; the post-processing uses quenching + alkali washing tower + water washing: reducing the temperature of the waste gas to ensure the safe operation of the back-end equipment and removing HCL, nitrogen oxides and other related gases generated by RTO secondary combustion, effectively solving the problem Owners’ organic waste gas management problems!

Process: alkali washing + water washing + defogging + regenerative incineration system (three-tower RTO) + quenching + alkali washing
Parameters: exhaust air volume: 20000Nm3/h, exhaust gas concentration: 0-6000mg/m3, exhaust gas components: VOCs organic exhaust gases such as benzene series, alcohols, esters, aldehydes, triethylamine, etc.;
Description: Pharmaceutical, pesticide and fine chemical industries
Instructions for use: Party A's company was registered and established in Anqing High-tech Zone, Anhui Province in December 2016. It is a high-tech enterprise focusing on the research, development, production and sales of APIs and advanced intermediates. It has set up R&D centers in Hefei and Anqing respectively. This time, our company designed and manufactured a 20000nm³/h organic waste gas treatment system for the owner. It mainly deals with the high-concentration organic waste gas generated by the two production workshops and the breathing valve of the tank area. The system adopts pretreatment + three-tower regenerative combustion system. RTO + post-treatment for treatment; pre-treatment uses one-level alkali washing + one-level water washing: mainly removes inorganic acid and alkali gases and particulate matter in the exhaust gas and some water-soluble organic waste gas in the exhaust gas; three-tower regenerative combustion system RTO Organic waste gas is deeply removed, with a treatment efficiency of over 99%; the post-processing uses a quenching + alkali washing tower: reducing the temperature of the waste gas to ensure the safe operation of the back-end equipment and removing HCL, nitrogen oxides and other related gases generated by RTO secondary combustion, effectively solving the problem Owners’ organic waste gas management problems!

The mainstream end-of-pipe treatment process for VOCs organic waste gas in the pharmaceutical and chemical industry consists of a pretreatment system, a regenerative thermal oxidizer (RTO) system, and a post-treatment system. The pretreatment system is primarily composed of a scrubber and a mist eliminator, designed to primarily remove inorganic acid-alkali gases, particles, and water-soluble organic waste gas from the exhaust. The RTO system, primarily utilizing the mainstream box-type design, selects the number of boxes based on the exhaust gas volume to achieve deep removal of VOCs organic waste gas. And the post-treatment system is primarily composed of a quench tower and a scrubber, mainly responsible for removing secondary pollution generated during RTO combustion.

Process: Regenerative incineration system (three-chamber RTO)
Parameters: exhaust air volume: 15000Nm3/h, exhaust gas concentration: 0-4800mg/m3, exhaust gas components: toluene 32%, ethyl ethyl ester 68% and other VOCs organic exhaust gas
Description: Coating, printing and other industries
Instructions for use: Party A's company was established in 2021 and is located in Nanping City, Fujian Province. It is an enterprise mainly engaged in the printing and recording media reproduction industry. What our company designed and manufactured for the owner this time is a 15000Nm³/h organic waste gas treatment system, which mainly treats high-concentration organic waste gas generated in coating and printing production workshops; the system uses a three-tower regenerative combustion system RTO + waste heat recovery for processing; The three-tower regenerative combustion system RTO deeply removes organic waste gas, with a treatment efficiency of over 99%; the treatment effect meets the local emission standards of Fujian Province, effectively solving the owner's organic waste gas treatment problem!

Regenerative thermal oxidizer (RTO): Organic waste gas is preheated by a regenerative ceramic, then heated to a temperature of at least 750°C by a burner. In the combustion chamber, it is subjected to oxidative decomposition into carbon dioxide and water, releasing heat in the process. After heated in a regenerative ceramic, it is vented to the chimney. Typically, the heat recovery efficiency of regenerative ceramics is up to 95%. Theoretically, the temperature differences at the inlet and outlet are generally ranging from 20°C to 40°C.
Therefore, during normal operation, the supplementary heat from the burner is sufficient to maintain the temperature of the treatment system within the range of 20°C to 40°C; that is, heat is balanced within the system. For instance, the calorific value of ethyl acetate stands at 5,698 kcal/kg, while the theoretical self-sustaining combustion concentration for the system is approximately 2,290 mg/m3. Theoretically, when the waste gas reaches the self-sustaining combustion concentration, the heat generated from the oxidation and decomposition of organic waste gas is sufficient to maintain the heat balance of the system. By this point, the RTO system will not consume any natural gas.
Nowadays, the most commonly used RTOs for waste gas treatment are the 3-bed RTO and the rotary RTO, both boasting a treatment efficiency above 99%. The 2-bed RTO has slightly lower efficiency and is generally used for the processing of low-concentration waste gas.

Catalytic combustion of CO: It is a process where organic waste gas is first preheated through a heat exchanger and then further heated to the initiation temperature (typically around 300°C, with slight variations depending on the specific catalyst) of the catalyst using an electric heater or burner. Once the waste gas reaches this temperature, the organic components undergo oxidative decomposition into carbon dioxide and water under catalytic action. The treatment efficiency for organic waste gas is up to 98%.
For low-concentration waste gas, catalytic combustion is frequently employed in conjunction with an activated carbon adsorption-desorption system or a rotary wheel system. Waste gas with a little higher concentration can be directly processed in a catalytic combustion chamber after being preheated with a heat exchanger.
Catalytic combustion is commonly used to treat organic components that do not contain chlorine, sulfur, nitrogen, etc. It is not well-suited for organic components containing chlorine, sulfur, or nitrogen, as these components can easily cause catalyst poisoning and deactivation, resulting in the waste-gas treatment efficiency not meeting the expected requirements.