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Guohong Company: Optimizing System Operation to Address the Challenge of Coal Use Author/Source: Yankuang Guohong Date: 2022-04-12 Clicks: 11 The company’s gasification workshop actively addressed the impact of changes in coal types on the system, making every effort to optimize it. The trial firing plan was strictly implemented, and every effort was made to address any fluctuations in the system. In the meeting room of the company’s gasification workshop, a discussion session was held on the techniques related to testing new coal types. Process engineers, technicians, and team leaders gathered together to analyze and discuss various aspects such as the precautions to take during the trial firing of new coal types, the key operating procedures, and the optimization of parameters related to the gasification furnace. Detailed operational strategies and precautions were established as a result. Since the performance parameters of coal vary depending on its source, it is crucial to ensure the stability of key process parameters such as the slurry concentration in the gasifier, furnace temperature, slag outlet pressure difference, lockhopper pressure difference, and gas composition during the use of new coal types. “After the change in the coal proportion, the most difficult part is how to optimize it. ”Zheng Zhongli, the process director of the company’s gasification workshop, said, “Changes in the fluidity of the coal slurry, its viscosity-temperature properties, and the ash melting point pose significant difficulties in coal grinding and the operation of the gasification furnace.” If the coal mixture is uneven, it will cause the system load to fluctuate sharply. If the coal grinding and gasification units are not adjusted in a timely manner, it will lead to poor fluidity of the coal slurry and sharp changes in its concentration, resulting in blockages in the gasification furnace and damage to the downcomer, which in turn causes the system to stop operating and severely impacts the company’s normal production. ” Production cannot afford any mistakes; only meticulous care will do. To ensure that the relevant indicators remain under control and to achieve safe and stable operation over long periods, they prepared a document titled \"Analysis of the Impact of Coal Blending Changes and Slurry Ash Content Changes on Gasification Operations and Corresponding Countermeasures.\" They also organized meetings involving all shifts to carefully analyze the effects of new coal types on the operation of the gasification furnace and to exchange operational experience. Regarding the coal mixing ratio, the slurry concentration and viscosity data are tracked item by item, and the stability and fluidity of the corresponding slurry are analyzed. At the same time, the operating parameters of the gasifier are determined based on the ash content of the coal slurry; detailed countermeasures are formulated for different positions. A coherent analysis is conducted on the causes of changes in key process parameters, and coordinated operations among various positions are carried out to ensure the safe and stable operation of the gasifier. Real-time monitoring of slurry quality to ensure the first checkpoint in gasification. At the coal grinding station 702 in the gasification workshop, operator Fan Xiujuan is checking the condition of the slurry deposits. “As the first stage in producing qualified water gas, the 702 coal grinding unit is also an important part of the gasification plant. ”Fan Xiujuan said, “Our task is to pay close attention to every detail in the coal grinding section, carefully check the condition of the coal grinders, low-pressure coal slurry pumps, and the material level in the outlet tanks, and report any abnormalities promptly while taking action to make adjustments. ” For Position 702, the amount of additives to be used is determined accordingly. Due to the impact of the pandemic, the transportation of coal from the northwest region has been affected, which leads to constant changes in the proportions of different types of coal. This requires operators on site to have a higher level of responsibility and vigilance; it also represents a test and opportunity to improve their operational skills. To this end, every operator at position 702 maintains a high level of awareness regarding safe production; they closely monitor the quality of the coal slurry through regular inspections, and prepare the additives in advance as needed during tank replacements, to ensure that the coal slurry additives are suitable for the new type of coal before it is used. For a stable system operation, the equipment must come first. In the maintenance team of the gasification workshop, team members move around every corner of the workshop, climbing up and down, all in order to carry out proper maintenance of each piece of equipment. They replace worn-out components in a timely manner, and disassemble the check valves of the low-pressure coal slurry pumps to ensure that the equipment is in good condition during the period of coal type adjustment, thus guaranteeing safety and stability. Striving for excellence in adjusting parameters, and working together to maintain production capacity – in the central control room of Guohong Company, the operators in the gasification workshop are constantly dealing with the challenges posed by changing coal mixtures, relying on their extensive experience to make the necessary adjustments. From the operating temperature of the gasifier, the temperature of the brick support tray, and the temperature of the syngas, to the pressure difference at the slag outlet, the methane content at the exit of the carbon cleaning tower, and the volume of the purified gas... Amidst this plethora of indicators, they have developed keen eyesight and composure; they can identify which indicators are deviating from normal levels, high or low, and with just a few clicks of the mouse and keyboard, they can resolve the issues. Even when encountering tricky problems, by communicating with colleagues in the same position or seeking advice from technicians, one can gain their own set of practical skills. It is precisely through everyone’s continuous exploration and research, as well as timely summarization and improvement, that the system is able to operate stably, and moreover effectively and optimally, even in the face of complex situations arising from changes in coal types. ”Faced with the shortage of coal and the challenges and pressures posed by changes in coal types, every member of Guohong Company’s gasification workshop faced these difficulties without fear, worked hard in their respective positions, and contributed their efforts to ensure the stable and efficient operation of the system through their practical actions.