Problems and Optimization Measures of High Pressure Flash System in GE Coal Water Slurry Gasification Plant
China Petroleum and Chemical Corporation Jiujiang Branch, Jiujiang 332004, China
| Abstract: | The black water flash evaporation system of the GE coal water slurry gasification device of a certain enterprise adopts a three-stage flash evaporation process, which analyzes a large amount of high flash gas dissolved in high-pressure black water, and sends it to downstream devices after heat exchange and condensation. In the actual production process, when the flash evaporation system operates for about 60 days, the pressure and temperature of the high-pressure flash evaporation system gradually increase and exceed the normal operating range, affecting the safe and stable continuous operation of the device. In severe cases, the device may shut down, and even cause environmental pollution accidents. After analysis, it is believed that the high-pressure flash steam condenser in the process failed to effectively reduce the heat extracted from the flash steam, resulting in problems of overpressure and overheating. Based on this theory, while maintaining the existing process design of the device, low-cost investment is made to increase the low-pressure ash water reuse spray pipeline. After practical application, the operating cycle of the high-pressure flash evaporation system has been extended by 181 days from 60 days (the longest operating cycle of a single series of gasifiers). This optimization effectively takes heat from high-pressure flash steam, not only achieving the purpose of cooling and reducing pressure in the high-pressure flash steam system, but also reducing the consumption of 0.45MPa steam in the deaerator due to the increase in condensate volume and temperature, reducing device energy consumption and saving over 3 million yuan in annual production costs. |
| Keywords: | Black Water Flash Evaporation; High-pressure Flash Steam; Spraying; Cooling and Depressurization |
| DOI: | 10.57237/j.cse.2023.03.005 |
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Received: 11 July 2023
Accepted: 5 September 2023
Published Online: 8 September 2023
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