How to determine the design pressure of coal water slurry gasification unit?

The coal-water slurry gasification technology of 6.5MPA and below is relatively mature. Domestic design institutes have made many sets, and the design is no problem.； We have opened many sets in China and have rich operating experience. ； There is no problem with the domestic supply of equipment, except that the domestic supply quality of SA387 plates needs to be improved. However, with the development trend of large-scale equipment, the coal gasification pressure has a tendency to shift to 8.7MPA. Although equipment manufacturing has become more difficult, and the supply quality of key valves and materials needs to be verified and improved, the advantages are also obvious.: 1) As the pressure increases, the amount of coal input increases, the number of furnaces will decrease, and the overall investment is equivalent to 6.5MPA. ； 2) In China, Nanhua currently operates one system, Dalian Dahua is building one, and Kingboard is designing another. The technology will gradually mature. ； 3) To achieve isobaric synthesis of methanol, only a circulating gas compressor is installed, which reduces the need for process gas boosting units and saves a lot of steam. ； 4) The cooling capacity required for the purification part is greatly reduced. ； 5) The required oxygen pressure of 8.7mpa is around 11.0MPa, but CHART’s high-pressure plate-fin heat exchanger can already be produced, and several foreign manufacturers of liquid oxygen pumps can also produce it. ； 6) The gasification of the original oil head manufacturer is all 9.0MPA. There is no problem with the purification operation and equipment set. There is a reference for the selection of the oxygen pipeline valve of the burner head. If your device is small in scale, use 6.5MPA, which is mature and reliable.

First of all, I agree with the point above! There are really many questions about this in the forum. I feel like I have answered it several times. I will answer it from three aspects.: 1. Considering the issue of technological maturity, all aspects of coal-water slurry gasification technology below 6.5MPa are mature, such as equipment, valves, pipelines, and technical maintenance and transformation, and the localization rate of equipment is very high. This is a major factor to consider when selecting pressure levels. 2. Based on the pressure required for the production and synthesis of target products, synthetic ammonia is usually used at a higher pressure, and methanol is usually used at a lower pressure. This is for the purpose of energy saving and consumption reduction. The energy of the entire device is produced and sold by itself, and no external force is needed to supplement energy. 3. The selection and source of materials for high-voltage equipment is a very objective issue and cannot be ignored. This post was last edited by GSP on 2009-2-10 15:08 ]