2822 results about "Coal gasification" patented technology

Hydrogen is produced from solid or liquid carbon-containing fuels in a two-step process. The fuel is gasified with hydrogen in a hydrogenation reaction to produce a methane-rich gaseous reaction product, which is then reacted with water and calcium oxide in a hydrogen production and carbonation reaction to produce hydrogen and calcium carbonate. The calcium carbonate may be continuously removed from the hydrogen production and carbonation reaction zone and calcined to regenerate calcium oxide, which may be reintroduced into the hydrogen production and carbonation reaction zone. Hydrogen produced in the hydrogen production and carbonation reaction is more than sufficient both to provide the energy necessary for the calcination reaction and also to sustain the hydrogenation of the coal in the gasification reaction. The excess hydrogen is available for energy production or other purposes. Substantially all of the carbon introduced as fuel ultimately emerges from the invention process in a stream of substantially pure carbon dioxide. The water necessary for the hydrogen production and carbonation reaction may be introduced into both the gasification and hydrogen production and carbonation reactions, and allocated so as transfer the exothermic heat of reaction of the gasification reaction to the endothermic hydrogen production and carbonation reaction.

The invention relates to a method for treating gasified waste water containing high-concentration phenol and ammonia. The method comprises the following steps: injecting alkali, pressurizing, stripping and removing acidic gas and ammonia in a waste water stripper, side-drawing ammonia-rich gas and segregating and concentrating by three levels, and extracting phenol from waste water after acid andammonia removal with MIBK as a solvent. With regard to extraction for phenol removal, residue generated is transported to the upper part of an extracting tower for countercurrent extraction after being cooled to 40 DEG C to 60 DEG C, with the volume ratio between the MIBK and the waste water being 1:4-10. The method realizes simultaneous removal of acidic gas, free ammonia and fixed ammonia from gasified waste water in the waste water stripper and obtains high-concentration alkaline air. The content of free ammonia and fixed ammonia in purified water from the waste water stripper is extremelylow, thus causing the pH value of waste water treated to reduce to 6 and being beneficial to the phenol removal effect of subsequent extraction part at an acidic status. Simultaneously, the MIBK has relatively good effect on the extraction of polyhydric phenol and can effectively remove polyhydric phenol in the waste water. In the method, the solvent can be easily recovered, with little loss of solvent and high phenol removal efficiency.