Discuss the tar content in the gas after electrostatic capture in various plants

Our level is less than 50 milligrams per standard cubic meter; the manufacturer is Xiangfan Jiuding

Our level is ten-odd milligrams per cubic meter. Urban gas supply.

Do you have any requirements regarding the tar content in the gas fed into the electrostatic precipitator?

There are no requirements for that thing; if there were any requirements, we would have to look for the cause in the primary cooler

1. Overview Apart from coke oven gas, ammonia and tar produced by the spray condensation of coke oven gas are the two main by-products in the coking process. The economic benefits generated by tar can help coking plants offset the cost pressures associated with gas washing. Although circulating ammonia water does not bring economic benefits like tar, if not properly managed, it will not only affect the production process but also pose challenges related to environmental emissions. In many ways, tar and oil are very similar; they are resources that are becoming increasingly scarce. The coking industry in modern Western countries is placing increasing emphasis on coking processes that do not involve recycling, and in the future, there will surely be a situation in the tar market where demand exceeds supply. Therefore, optimizing the recovery process to maximize the recovery of tar generated by the coking process will bring considerable economic benefits to coking plants, both now and in the future. Due to process issues and site constraints, improving the quality of tar ammonia solution by adding more equipment is limited. The approach adopted by foreign companies to address this problem is to add chemical agents during the production process in order to enhance the separation of tar from ammonia, thereby reducing the viscosity of the tar. This not only achieves dehydration but also prevents the tar contained in the recycled ammonia from depositing in the system’s equipment. Currently, there are several chemical methods available internationally to improve the quality of tar, mainly including the following two types: water-based solutions and oil-based solutions. This chemical approach, combined with improvements in on-site equipment operation, has yielded excellent results. • Water-based solution: A water-based solution (demulsifier) typically involves adding chemical agents to the tar products, which then enter the storage tanks. After staying there for a certain period of time, these water-based agents break down the emulsions, allowing ammonia to be separated from them and to flow back into the system. This technology can effectively reduce the moisture content of tar, but it has little to no effect on the quality of the recycled ammonia water. • Oil-based technical solution: This technique involves adding tar viscosity reducers and demulsifiers to the gas collection pipes and bridge pipe spraying circuits. By this method, it is possible to increase the tar dehydration rate, and it also has a positive effect on the quality of the recycled ammonia water. Narco tar dehydrating agent is also an excellent anti-adhesion agent; it forms a layer on the surface of the tar, thereby **reducing** its adhesiveness. Another factor affecting the tar dehydration rate and the quality of the recycled ammonia water is the content of quinoline-insoluble substances, as these substances form stable emulsions with the tar and ammonia water. Under normal conditions, quinoline insolubles have no significant impact on the separation of tar and ammonia water, but given the quality issues associated with tar and ammonia water, it is a factor that cannot be ignored. This chemical solution can reduce the problem of tar-ammonia separation caused by quinoline insolubles. Currently, the countries that use these chemical technologies to improve the tar-ammonia water separation process include **Canada, the United States, Japan, Brazil, Chile, and some members of the European Union**. Especially in Japan and South America, many large international steel companies’ coking plants have adopted these technologies over the past two years. 3. The importance of quality control for tar and ammonia water. Ammonia water and tar are produced simultaneously, and they are then treated together; however, after passing through a gas-liquid separator, they are processed separately. However, due to the design of the gas washing process, they are combined in many steps. This characteristic of sometimes separating and sometimes combining causes many problems throughout the entire production process. To meet both environmental emission requirements and the demands of the tar-ammonia separation process as well as the tar recovery process, coking plants must pay attention to the management of ammonia and tar quality. Strict and proper quality control of ammonia-tar can maximize economic benefits while reducing operating costs. 3.1 Ammonia: Even if all the tar present in ammonia is separated, the properties of ammonia itself still have a direct impact on the production process and operating costs. We believe that clean ammonia still causes corrosion and scaling in production systems. The main reason for corrosion caused by ammonia water is the presence of ammonia, cyanides, H2S, CO2, and other pollutants in it. There are very few measures that can essentially eliminate corrosion. Theoretically, there should be no calcium present in ammonia solution. However, in practice, small amounts of calcium are often detected in ammonia solutions (

:)Less than 10 mg/m3:)

Less than 10 mg/m3, with no fluctuations

Around 20 mg/m3, very stable

Around 30 milligrams; the standard is to keep it under 50, which is easy to achieve

Our level is less than 50 milligrams per standard cubic meter; it’s usually around 20, supplied by the power plant