47results about How to "Flexible process control" patented technology

The invention belongs to the technical field of porous ceramic materials and their preparation and especially discloses a pure silicon carbide filtering membrane and a preparation method thereof. The pure silicon carbide filtering membrane has a high porosity, a low pressure drop, high strength, good thermal shock resistance and a high use temperature. The preparation method can be realized easily and can guarantee product performances. The pure silicon carbide filtering membrane comprises pure SiC, is a surface membrane layer obtained by pile-up and binding of fine SiC particles and has aperture sizes of 0.1 to 20 microns and membrane porosity of 25 to 50%. Fine SiC particles, silicon powder, a pore-forming additive and one or more organic resins as raw materials are prepared into a surface membrane layer by spraying or dipping and the surface membrane layer is dried and sintered to form the pure silicon carbide filtering membrane. The pure silicon carbide filtering membrane can be used in an oxidation atmosphere and in a reducing atmosphere, has strong acid corrosion and alkaline corrosion resistance, and can be used for various high / low temperature fluid filtering purification fields such as coal gasification chemical engineering, integrated gasification combined cycle (IGCC) and pressurized fluidized bed combustion (PFBC) coal gasification power generation, and high temperature flue gas, automobile exhaust and water purification.

The invention belongs to the technical field of porous ceramic materials and their preparation and especially discloses a pure SiC membrane tube support and a preparation method thereof. The pure SiC membrane tube support comprises pure SiC, is obtained by pile-up and binding of crude SiC particles having sizes of 5 to 400 microns, and has an uniform communicated aperture structure having an average aperture size of 5 to 120 microns and integral porosity of 25 to 50%. The preparation method comprises that crude SiC particles, crude silicon oxide particles or silicon powder as basic materials and one or more polymers as binders are mixed; the mixture is pressed into a support by a cold isostatic pressing sheath; and the support is sintered into the pure SiC membrane tube support. The pure SiC membrane tube support can be used in an oxidation atmosphere and in a reducing atmosphere, has strong acid corrosion and alkaline corrosion resistance, and can be used for various high / low temperature fluid filtering purification fields such as coal gasification chemical engineering, integrated gasification combined cycle (IGCC) and pressurized fluidized bed combustion (PFBC) coal gasification power generation, and high temperature flue gas, automobile exhaust and water purification.

The invention belongs to the technical field of multipore ceramic materials and preparation thereof, and particularly relates to a gradient-porosity pure silicon carbide membrane tube and a preparation method thereof. The gradient-porosity pure silicon carbide membrane tube consists of pure SiC; a gradient filter structure consists of a supporting body layer and a surface membrane layer, wherein the supporting body is formed by stacking and combining roughly granular SiC, and the average aperture is 5-120 mu m; the surface membrane layer is formed by stacking and combining finely granular SiC, and the aperture is 0.1-20 mu m; and the whole porosity of the membrane tube is 25-50%. The preparation method comprises burdening, forming the supporting body, preparing the membrane layer and sintering, wherein forming is performed under equal static pressure; the forming pressure is controlled between 40 and 150MPa; the sintering temperature is controlled between 1,500 and 2,400 DEG C; and heat is preserved for 0.5-5 hours. The method is easy to implement, and the performance of a product can be guaranteed. The gradient-porosity pure silicon carbide membrane tube can be used under an oxidization atmosphere and a reduction atmosphere, is high in acid and alkaline corrosion resistance and can be applied to gas chemical engineering and integrated gasification combined cycle (IGCC) and pressurized fluidized bed combustion (PFBC) power generation and used for filtering and purifying various types of high- and low- temperature fluid, such as high-temperature flue, automobile tail gas, water and the like.

The invention discloses a thin strip continuous casting method, that is, molten steel enters the molten pool formed by crystallization rolls, and is cooled and lightly rolled by the crystallization rolls to form a cast strip. In the width direction of the strip, the gas is sprayed on both sides of the cast strip for forced cooling, so that the cast strip is cooled to the temperature required by the process, and then it is hot-rolled and controlled to cool until it is coiled. The device of the present invention includes two blowing, connecting rod transmission and synchronous mechanisms that are respectively arranged on both sides of the casting belt; the blowing mechanism includes bearing seats, support shafts, nozzles, etc.; The rod is connected with the support shaft; the synchronous mechanism includes a moving trolley, a rack, a gear, a trolley driving device, etc. The angle between the nozzle and the casting belt is adjusted by the rotation of the support shaft; the distance between the nozzle and the casting belt is adjusted by the synchronous movement of the moving trolley. The invention can effectively improve the surface and internal quality of the cast strip, increase the productivity and expand the production of steel types.

The invention relates to a method for producing at least one air product, wherein an air separation system (100) is used which has a primary air compressor (10), a primary heat exchanger (20) and a distillation column system (30), and which comprises a first and a second operation mode, wherein, in the first operating mode, at least one liquid air product (LIN, LOX) produced in the distillation column system (30) is saved and, in the second operating mode, the at least one air product (LIN, LOX, LAIR) saved in the first operating mode and / or at least one additional liquid air product is supplied to the distillation column system (30). The method is characterized in that, in the second operating mode, at least one gaseous pressure flow (b - g) at a temperature level which lies below a hot-side temperature of the primary heat exchanger (20) is supplied to a cold compressor (45), compressed in the cold compressor (45) from a first above-atmospheric pressure level to a second above-atmospheric pressure level, and is supplied to at least one distillation column (31, 32) of the distillation column system (30) at the second above-atmospheric pressure level. The invention further relates to a corresponding air separation system (100) and to a method and to a device for producing electrical energy.

The invention discloses an amino acid-containing condensate steam stripping system and a tail gas treatment method for solving the problems of an existing steam stripping system that a treatment method is complex, system energy consumption is high, corrosion to pipe plates and pipelines is serious and equipment investment is high. The method comprises the steps of correspondingly feeding high temperature condensate, medium temperature condensate and low temperature condensate to a high temperature condensate stripping section, a medium temperature condensate stripping section and a low temperature condensate stripping section of a stripping tower, respectively, reducing the temperature of stripping gas at a stripping tower top to be 85-90 DEG C through an overhead condenser, and feeding into an incineration furnace, wherein the high temperature condensate stripping section is provided with a reboiler, low-pressure steam used as a heat source is used for carrying out steam stripping to the condensate, the medium temperature condensate stripping section and the low temperature condensate stripping section adopt high temperature flash gas generated by the high temperature condensate stripping section as the heat source, and low-pressure nitrogen gas is introduced for gas stripping. The process is simple, the operation can be controlled flexibly, the system stability is good, energy is saved, the consumption is reduced, the corrosion of the steam stripping system can be reduced to the maximum extent and the service life of the equipment can be prolonged.

The invention relates to the field of porous ceramic materials, and specifically relates to a dual-gradient pore-structure sialon and silicon carbide combined membrane tube and a preparation method thereof. The membrane tube material is composed of sialon and silicon carbide. The membrane tube has a dual-gradient filtering structure composed of a support body layer and a surface membrane layer. The support body layer is composed of a combination of sialon produced through a reaction and coarse silicon carbide grains, and has an average pore size of 10-50mum. The surface membrane layer is composed of a combination of sialon produced through a reaction and fine-particle silicon carbide grains, and has an average pore size of 0.1-5mum. An overall porosity of the membrane tube is within a range of 40-50%. The preparation method of the membrane tube sequentially comprises the steps of material preparation, support forming, membrane layer preparation and firing. Isostatic pressing is adopted in the forming step, wherein a forming pressure is controlled at 100-150MPa. The firing temperature is controlled at 1650-1850 DEG C, and a temperature maintaining time is 3-5h. The method is easy to realize. With the method, product performance can be ensured. The membrane tube provided by the invention has the advantages of high application temperature, high acid corrosion resistance and high alkali corrosion resistance. The membrane tube can be used in filtration purification of various fluids with high temperature or low temperature, such as high-temperature high-press gas filtration dedusting, water purification and the like.

The invention is an improvement of a coking waste water treatment method. The method comprises steps of oil removal, impurity removal, electrolytic disintegration and A / O technology, and is characterized in that a biological hydrolysis acidification is set after electrolytic disintegration and before A / O technology; the electrolytic disintegration is electrode energizing aerobic strong electrolysis; the A / O technology employs butterfly jet aerators that are arranged in large intervals and have circulating pumps; the waste water is treated with aeration, aeration stopping and forced internal circulation, stationary deposition and water draining period processing successively, so as to realize biological oxidation and nitration-denitrification in a same pool. Cooperative effects and coordination of each technology increase treatment effect, and treated outlet water can stably reach COD no more than 100mg / l and NH3-N no more than 15 mg / l; besides, land occupation is saved undera same treating capacity and is only 80% of that of a common technology; operating cost of per ton of water is low; and a treatment effect is stable.

The present invention proposes a method and equipment for extracting phosphate rock with 93%-98% concentrated sulfuric acid to produce phosphoric acid. Sulfuric acid and phosphate rock pulp are respectively added to two series-connected cylindrical reaction tanks of equal volume according to a certain ratio. The reaction tank is equipped with several sulfuric acid distributors and surface coolers, as well as a single central stirring paddle with large circulation. The cold air passes over the surface of the slurry thrown by the surface cooler and the sulfuric acid distributor, and the cold air is heated and humidified, thereby taking away the water vapor and removing the heat of reaction. The extraction reaction is carried out in two reaction tanks at the same time, and the operating conditions of the two tanks can be controlled separately, which is more conducive to the decomposition of phosphate rock and the coarse crystallization; the sulfuric acid is easy to disperse and more uniform under the sprinkler of the sulfuric acid distributor, and will not produce local A lot of SO 4 2- excess. The invention has strong adaptability to phosphate rock and can effectively improve the P 2 o 5 Improve the extraction rate, improve the crystallization of calcium sulfate dihydrate, and improve the filtration strength.