| 摘要 |
<p>PROBLEM TO BE SOLVED: To inhibit the corrosion of an equipment constituting material at the time of starting, in a gas treating device for bringing the gas generated in starting a pressurized coal gasification plant into contact with water to cool and purify the gas. SOLUTION: The gas generated in starting a pressurized coal gasification plant is brought into contact with water, purified and cooled in this gas treating device. In this case, the hydrogen ion concn. (pH) of the circulating water to be brought into contact with the generated gas is kept at 6 to 9 to prevent the corrosion of the equipment constituting material. As the means, a pH meter 33 for measuring the pH of the circulating water in a decanter 26 attached to a gas purifier 3, a pH controller 34 for controlling the supply of a pH regulator (sodium hydroxide, etc.), to the circulating water based on the output of the pH meter 33, a pressure reducing valve 28 for reducing the pressure of the circulating water in the decanter 26 and a pressure reducer 7 for liberating the acidic gas from the pressure-reduced cooling water are provided. Further, a cooler 24 for cooling the cooling water to 50 deg.C or a heater for heating it to 130 deg.C is provided.</p> |
