Selection of liquid level gauges for gasification furnaces

Regarding the selection of a level gauge for the gasification furnace, you have already mentioned the double-flange differential pressure level gauge and analyzed the shortcomings of 316L and HC diaphragms. Fully gold-plated diaphragms or diamond diaphragms offer better performance, but at a higher cost. It is recommended to consider the following aspects when looking for other possible solutions: 1. Material upgrade: Other materials that are resistant to high temperatures and corrosion, such as Hastelloy and titanium alloys, can be explored; these materials may offer a longer service life. 2. Technological innovation: Consider using contactless measurement technologies, such as radar level gauges or ultrasonic level gauges; these devices avoid direct contact with the medium and may offer better durability. 3. Additional protection: Add a protective layer to existing equipment or use an external filtering system to reduce the direct exposure of the diaphragm to harsh environments. 4. Consult professional manufacturers: Have in-depth discussions with the specialized manufacturers that produce these devices to find out whether there are customized materials or new technologies that can be applied in such extreme operating conditions. Through these methods, a solution with a better balance between cost and effectiveness can be sought. At the same time, it is also recommended to conduct small-scale tests during actual operation to verify the practical effectiveness of the alternative solutions. .

Why does a gasification furnace need a liquid level measurement? Is there water inside the furnace?

316L diaphragm: Advantages: It has good corrosion resistance and a certain level of wear resistance. Disadvantage: Under the high temperature, high pressure, and hydrogen-rich conditions in the gasification furnace, the hydrogen resistance of 316L diaphragms is weak, making them prone to hydrogen embrittlement, which leads to inaccurate measurements and damage to the diaphragms. HC diaphragm: Advantages: It offers higher corrosion resistance and wear resistance. Disadvantages: It also suffers from insufficient hydrogen barrier properties, and its service life is relatively short. Fully gold-plated diaphragm: Advantages: Gold possesses excellent density, corrosion resistance, and ductility. The gold plating helps to prevent hydrogen penetration, while the high flexibility of gold has little impact on the diaphragm’s sensitivity to pressure, thereby ensuring measurement accuracy and rapid response. Disadvantage: The price is high, increasing the cost of the level gauge. Diamond diaphragm: Advantages: The diamond diaphragm boasts extremely high wear resistance and hydrogen impermeability, enabling it to operate stably for long periods in high-temperature, high-pressure environments as well as those containing slag and hydrogen. At the same time, the diamond diaphragm has a long service life, reducing maintenance costs and replacement frequency. Disadvantage: It also has the issue of high prices

The gasification furnace has a quench chamber, and it is the liquid level in this quench chamber that is measured

Oh! The gasification furnace I’m familiar with doesn’t have a quench chamber, so I can’t think of it right away. What substance are you gasifying?

We are water-coal slurry gasification furnaces. The gasification furnace is divided into a combustion chamber and a quenching chamber. The water-coal slurry burns in the presence of high-pressure oxygen, producing crude synthesis gas such as CO, hydrogen, and carbon dioxide. This crude synthesis gas is cooled by water spraying in the quenching chamber, which also helps to remove some of the ash and slag. There is high-temperature, high-pressure water in this chamber, and this water contains some ash and slag. What is measured is the liquid level in the quenching chamber, using a differential pressure transmitter that features a flushing water loop.