A big scammer from Germany! !

Thread Content

A German-owned smelting furnace company’s owner now needs to add exhaust gas treatment equipment. This German company convinced the owner that it was necessary to install a so-called “negative pressure ventilation system.” The technical description reads as follows: When designing the XXXX smelting furnace (hereinafter referred to as “the furnace”), the diameter and height of the chimney were calculated based on customer requirements and the furnace’s design, with natural ventilation taken into account. According to these calculations, under normal operating conditions, the suction force at the pressure measurement point at the top of the exhaust gas hood should be between 10 Pa and 20 Pa. 3. Within this suction range, the feeding system adjusts the amount of material fed based on the difference between the temperature detected by the thermocouple at the top of the exhaust gas hood and the set temperature: when the temperature there exceeds the set value, the system assumes that the material level has dropped, allowing further feeding until the actual temperature drops below the set value. 4. The introduction of a dust collection system increases the speed of exhaust gas emission and the suction force, compared to natural ventilation. This allows the hot gases in the melting chamber to reach the top of the exhaust gas hood, where they are then drawn away by the dust collection system. 5. Even if there is enough material to be melted in the pre-melting area, it is still possible for the temperature detected by the thermocouple at the top of the exhaust gas hood to exceed the set value. Continuing to feed material in such cases can lead to an excessive accumulation of material in the pre-melting area, even causing it to overflow, which may result in injuries to people below and damage to equipment. 6. Additionally, as per the settings of the furnace, when the thermocouple at the top of the exhaust gas hood continues to show excessive temperatures, the burners in the melting chamber will automatically switch to a lower power mode, resulting in reduced melting efficiency and higher energy consumption compared to normal operating conditions. 7. Operating the equipment under such abnormal conditions can also shorten the lifespan of the refractory materials and cause damage to other components. Based on our engineering expertise and experience with clients both domestically and internationally, we recommend the following for furnaces that are about to install a dust collection system: 1. Install a furnace pressure control system to precisely regulate the suction force for exhaust gas emission, thereby preventing the problem of “excessive suction” caused by the dust collection system, and ensuring that both the melting rate and energy consumption remain within the designed ranges. 2. Install a laser-based material level control system as an additional safety measure for feeding control. This system can scan the entire area to monitor the material level in the pre-melting area, keeping it at the optimal level. This not only prevents excessive feeding and potential material overflow but also ensures that the material level remains optimal, thus maximizing the effectiveness of the exhaust gas “pre-melting” function. The exhaust gas flow rate is only a little over 4,000 CMH, yet through such deceptive tactics, the owner lost over 200,000! Wicked capitalism!