GE水煤浆气化装置高压闪蒸系统存在的问题及优化措施
中国石油化工股份有限公司九江分公司, 江西九江 332004
| 摘 要： | 某企业GE水煤浆气化装置黑水闪蒸系统采用三级闪蒸流程，将高压黑水中溶解的大量高闪气体解析出来，经换热冷凝后送往下游装置。实际生产过程中，闪蒸系统运行60天左右时，高压闪蒸系统压力、温度逐渐升高并超出正常操作范围，影响装置安全稳定连续运行，严重时装置停工，甚至造成环境污染事故。经过分析认为，流程中高压闪蒸汽冷凝器未能有效降低将闪蒸气中的热量取走，从而带来超压、超温的问题。围绕该理论，在保持装置现有流程设计的基础上，通过低成本投入，增加低压灰水回用喷淋管线。实践运用后，高压闪蒸系统运行周期由60天延长181天（单系列气化炉最长运行周期）。此次优化，高压闪蒸汽有效取热，不仅达到高压闪蒸系统降温降压的目的，也因凝液量的增加及温度的升高，有效减少除氧器0.45MPa蒸汽的消耗量，降低了装置能耗，节约年生产成本300多万元。 |
| 关 键 词： | 黑水闪蒸; 高压闪蒸气; 喷淋; 降温降压 |
| DOI： | 10.57237/j.cse.2023.03.005 |
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收稿日期: 2023-07-11
接受日期: 2023-09-05
在线出版日期: 2023-09-08
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 |
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