44results about How to "Achieving long-term operation" patented technology

The invention provides a plate type air preheater with glasses as heat exchange plates, belonging to the technical field of heat exchangers. The plate type air preheater comprises an air preheater frame, the air preheater frame comprises an upper cover plate (10), a lower bottom plate (11) and a stand column (5) and is internally provided with a plurality of heat exchange plates (1) which are correspondingly placed in vertical direction; a sealing strip (4) is arranged between every two heat exchange plates (1) which are adjacent in vertical direction; the sealing strips (4) are mutually staggered at 90 degrees and form a plurality of sealing fluid channels which are adjacent and mutually staggered at 90 degrees by being placed in a staggered way so as to respectively form hot fluid channels and cold fluid channels; rectangular glass plates are adopted as the heat exchange plates (1), and the glass can be silicon-boron glass and boron-free low-alkali glass or quartz glass; and supporting strips (2) which are rectangular or S-shaped nonmetal plate bars are arranged among the fluid channels formed by the upper and lower heat exchange plates (1). The invention has dew point corrosionresistance, efficiently recovers the low-temperature exhaust heat of smoke and can reduce the temperature of discharged smoke and enhance the efficiency of a heating furnace.

The invention provides a raw coal gas hydrogen production co-production LNG process with methanation, which belongs to the technical field of raw coal gas hydrogen production. The process uses raw gas from low-rank coal pyrolysis as raw material, undergoes pretreatment, compression purification, conversion hydrogenation, desulfurization and decarbonization, methanation, pressure swing adsorption, and cryogenic separation to obtain high-purity hydrogen and LNG products. In the present invention, a tar and naphthalene multi-stage removal system is set in the raw coal gas hydrogen production and co-production LNG process. Through the optimized combination of each purification process, when the impurities in the raw coal gas fluctuate in a large range, the tar, naphthalene, ammonia, etc. , sulfur and other impurities can also be effectively removed. The process of the invention is set for methanation, and can increase the LNG production capacity by 40-60% under the same raw gas volume and hydrogen production. At the same time, the methane concentration in the raw coal gas is increased from about 6% to 11-24% through methanation, and further enriched to 24-60% by PSA, so that the gas volume entering the cryogenic separation is greatly reduced, and the cost of cryogenic separation is greatly reduced. investment and energy consumption.

The invention discloses a digital representation method of a coal-fired boiler operation state. The method comprises the steps that data is collected from four main tubes of a boiler; according to thecollected data, the corrosion rate of the boiler and parameters needed by the residual service life are calculated respectively; key data affecting boiler operation is screened out from the collecteddata according to corresponding boiler operation safety requirements; the residual wall thickness value of the boiler tubes, the residual service life value of the boiler and the smallest allowable thickness value of the boiler tubes are calculated respectively; the residual wall thickness valve, the residual service life value and real-time temperature and pressure values of the boiler are compared with specified allowable operation parameters of the boiler; the overall operation state of the boiler is judged; three state intervals are represented by different colors; different serial numbers are given to different boilers, and the serial numbers corresponding to the boilers are displayed through green, yellow and red on a display interface. The analysis accuracy of collected mass data is high, boiler real-time operation state health values can be visual, the tube burst frequency can be reduced, and long-period operation of the boiler is achieved.

The invention belongs to the technical field of preparation of coal based needle coke, and particularly relates to a coal based needle coke material pretreatment process, comprising the following steps: jointly stirring the cola based needle coke material, coal based solvent and petroleum based solvent, settling, dividing into a heavy phase and a light phase, pumping out the heavy phase and sending to the outside, distilling the light phase, wherein one part of gaseous phase after distillation is taken as overhead reflux, the other part is taken as a circulating solvent and returns to a mixingtank; enabling quinoline insoluble pitch and hydrogen-donor solvent to generate hydrogenation reaction in a hydrogenation reactor, sending the material after hydrogenation into a rectifying tower, wherein one part is taken as tower bottom reflux, and the other part is sent into the mixing tank at the bottom of the rectifying tower; cooling part of dehydrogenation solvent gaseous phase by a condenser at the top of the rectifying tower and then flowing into a tank at the top of the rectifying tower, wherein one part is taken as rectifying tower top reflux, the other part is heated by a heatingfurnace together with hydrogen and then sent into a hydrogen-donor solvent hydrogenation reactor, the hydrogen-donor solvent after re-hydrogenation is divided into gaseous phase circulating hydrogen and liquid phase circulating hydrogen-donor solvent by a gas-liquid separator.