37results about How to "Improve sulfur fixation rate" patented technology

The invention relates to a method for preparing molybdenum nickel alloy by directly reducing and smelting molybdenum nickel ore. The method comprises the following steps: grinding the molybdenum nickel ore into molybdenum nickel ore powder with the average particle size of less than or equal to 0.18 mm; adding a slag forming agent and a reducing agent with the average particle size of less than or equal to 0.18 mm into the molybdenum nickel ore powder to obtain furnace charge; mixing the furnace charge uniformly and pelletizing to obtain pellet; heating the pellet to 1,600 to 1,800 DEG C; smelting; and collecting liquid alloy, slag, smoke dust and furnace gas respectively, wherein the liquid alloy is crude molybdenum nickel alloy; the direct yield of the molybdenum and the nickel is 96 percent and 94 percent respectively; the molybdenum content of the smoke dust is less than 0.2 percent and the nickel content of the smoke dust is less than 0.2 percent; and the SO2 concentration of thefurnace gas is less than or equal to 400 mg / m<3>. The process method is simple and reasonable, and convenient to operate; the molybdenum nickel ore is not subjected to oxidizing roasting de-sulfuration; and the crude molybdenum nickel alloy is prepared by directly reducing and smelting the molybdenum nickel ore and by using the carbon of the molybdenum nickel ore as a reducing agent, so that indirect smelting is changed into direct smelting. The prepared molybdenum nickel alloy is low in sulfur content and phosphorus content, environment friendly and low in production cost; and the method is suitable for extraction of the molybdenum nickel ore.

The invention discloses a multifunctional rare earth sulfur-fixing denitration energy-conservation additive, which solves the problems that the conventional sulfur-fixing agent has relatively low sulfur-fixing rate and does not have the function of reducing NOx emission. The additive is characterized by consisting of the following raw materials in percentage by mass: 8 to 10 percent of rare earth compound, 12 to 15 percent of inorganic salt, 51 to 65 percent of alkaline earth metal compound, 5 to 8 percent of aluminum compound, 5 to 8 percent of zinc compound and 5 to 8 percent of silicon compound. The additive is prepared by the following steps of: grinding the raw materials into fine particles with the particle size of 100 to 300 meshes; proportioning the particles according to the mass percentage at normal temperature; uniformly stirring and mixing; preparing powder from the mixture; and compounding. The additive has the advantages of capability of being popularized in a large area, high sulfur-fixing rate and denitration function and is suitable for coal-smoke type heavily-polluted production links.

The invention provides a desulfurization and denitration combustion improver in blast furnace coal injecting as well as a preparation method and a using method thereof. The desulfurization and denitration combustion improver is prepared from the following raw materials in percentage by weight: 18 to 23 percent of manganese dioxide, 5 to 8 percent of ferric oxide, 9 to 13 percent of barium carbonate, 10 to 16 percent of calcium oxide, 5 to 8 percent of sodium carbonate, 10 to 16 percent of rare earth oxide, 2 to 6 percent of titanium dioxide, 3 to 6 percent of potassium nitrate and the balanceof activated carbon; the rare earth oxide is prepared from the following raw materials in percentage by weight: 40 to 55 percent of yttrium oxide, 25 to 35 percent of lanthanum oxide and 20 to 30 percent of indium oxide; the average particle diameter of the rare earth oxide is 10 to 40 mum. The desulfurization and denitration combustion improver provided by the invention has a remarkable combustion-supporting effect on pulverized coal, the combustion efficiency of the pulverized coal can be effectively improved, emission of NOx and SOx can be effectively reduced, and the purposes of energy conservation and emission reduction can be achieved.

The invention provides a civil high-strength sulfur-fixing briquette and a preparation method thereof. The briquette is prepared by mixing, by weight, 65-70 parts of anthracite powder, 12-15 parts of fat coal powder, 1-2 parts of sodium bentonite, 1-2 parts of calcium oxide, 0.5-1.0 part of corn pregelatinized starch, 0.2-0.5 part of silicon dioxide, 0.2-0.5 part of sodium chloride, 0.1-0.2 part of sodium dodecyl benzene sulfonate and 13-15 parts of water. The preparation method of the briquette comprises the steps of firstly, crushing the anthracite coal and the fat coal powder until the particle size is 3 mm or below; then, adding the crushed anthracite coal powder, the crushed fat coal powder and solid powder of the sodium bentonite, calcium oxide, corn pregelatinized starch, silicon dioxide, sodium chloride and sodium dodecyl benzene sulfonate into a stirrer by proportion for uniform mixing, adding the water by proportion, uniformly mixing the components, and performing standing to obtain a mixed material; finally, pressing the mixed material for shaping, and drying the mixed material to obtain a briquette product. According to the civil briquette prepared by means of the method, the strength of the briquette can be significantly enhanced, the sulfur fixing rate is increased, and the SO2 emission during combustion is reduced.

The invention discloses a novel sulphur-fixing agent. The novel sulphur-fixing agent is prepared from, by weight, 2-5 parts of kaolin, 3-6 parts of bentonite, 4-8 parts of zeolite, 5-8 parts of kieselguhr, 2-4 parts of perlite, 10-15 parts of cordierite, 1-3 parts of talcum powder, 6-8 parts of calcium oxide, 4-8 parts of ferric oxide, 3-5 parts of zinc oxide, 0.2-0.4 part of calcium peroxide, 6-8 parts of strontium carbonate, 4-7 parts of barium hydroxide, 0.2-0.5 part of potassium sulphate, 0.3-0.7 part of vanadium pentoxide, 6-9 parts of niobium pentoxide, 0.1-0.3 part of aluminum powder, 20-25 parts of ethyl alcohol, 5-9 parts of nanometer titania and 6-8 parts of nano calcium carbonate. The novel sulphur-fixing agent is reasonable in formula, resistant to high temperature and good in high-temperature sulphur-fixing effect, and has good development prospects on the aspect of coal sulphur fixing.

The invention discloses a nano sulfur-fixing agent which is prepared from the following components in parts by weight: 4-6 parts of kaolin, 2-5 parts of diatomite, 1-3 parts of diopside, 4-7 parts of cordierite, 1-3 parts of talcum powder, 5-8 parts of calcium oxide, 3-6 parts of iron oxide, 2-5 parts of zinc oxide, 0.3-0.6 part of calcium peroxide, 3-5 parts of strontium carbonate, 2-6 parts of barium hydroxide, 0.3-0.5 part of potassium sulfate, 0.2-0.6 part of vanadium pentoxide, 6-8 parts of niobium pentaoxide, 1-3 parts of sodium ferrate, 0.4-0.8 part of sodium citrate, 20-25 parts of ethanol, 4-7 parts of nano titanium dioxide, 5-8 parts of nano calcium carbonate and 1-3 parts of nano aluminum oxide. The sulfur-fixing agent disclosed by the invention has the advantages of reasonable formula, high temperature resistance and favorable high-temperature sulfur-fixing effect, and thus, has favorable development prospects in the aspect of sulfur fixation of coal.

A composite biomass briquette is made up of biomass including stalk or straw, wood leftover, city household garbage and raw coal through crushing, mixing with chlorine fixating agent, sulfur fixating agent and combustion promoter, and hot die pressing. Its advnatages are high compression strength, low combustion point, high combustion efficiency and less environmental pollution.

The invention provides a preparation method of a clay-calcium-based sulfur fixing agent. The preparation method includes acidizing calcium oxide with tartaric acid, drying, grinding, and calcining ina muffle furnace to obtain acidized calcium oxide; and mechanically mixing the acidified calcium oxide and natural clay and grinding evenly to obtain the clay-calcium-based sulfur fixing agent. The sulfur fixing agent has the advantages of fluffy structure, uniform particle distribution, increased specific surface area, high sulfur fixing rate, good thermal stability of sulfur fixing products andthe like, is used for sulfur fixing of cow dung / high-sulfur composite coal, wherein the sulfur content (St, ad) of the briquette is less than 0.50%, and the sulfur fixing rate reaches about 70.0%, andthus sulfide emission during combustion of the cow dung / high-sulfur composite coal is effectively reduced. In addition, the sulfur fixing agent prepared by the method has the advantages of easily-available raw materials, safe use, simple preparation process and better economy and application.

A disclosed combustion-supporting agent for coal is characterized by being composed of the following compositions in parts by weight: 20-30 parts of zirconium slag, 20-30 parts of white mud, 10-20 parts of ferrocene, 5-10 parts of diatomite, 5-10 parts of titanium dioxide, 5-10 parts of active carbon, 1-5 parts of urea, 1-5 parts of manganese oxide, 1-5 parts of carboxymethylcellulose sodium, 1-5 parts of potassium nitrate, 1-2 parts of cerium isooctanoate, and 1-2 parts of sodium chloride. The combustion-supporting agent with the above formula is obtained through a lot of experiments, and through synergic cooperation of the compositions, the obtained combustion-supporting agent has functions of immobilizing sulfur, removing coke, eliminating smoke and the like, is good in effect and is relatively convenient when being used.

The invention relates to the technical field of coal processing, and discloses a briquette binder, a preparation method and applications thereof, wherein the briquette binder comprises coking coal pitch, a biomass modification material, an inorganic magnesium-based curing agent and an auxiliary agent according to a weight ratio of (5-20):(8-25):(0.5-5):(0.1-0.3), wherein the auxiliary agent comprises at least one selected from a surfactant, a pore forming agent, a dehydrating agent and a cross-linking agent. According to the present invention, under the synergistic effect of various components, the briquette binder can complete the pulverized coal cementation process, the formed briquette can meet the industrial coal demand, the waste in the industrial and agricultural production process is solved, and the efficient use of resources is improved; and by adding the inorganic magnesium-based curing agent and the auxiliary agent, the strength and the impermeability of the briquette are enhanced, the combustion of the briquette is promoted, and the good sulfur fixation effect is provided.

The invention belongs to the technical field of industrial waste resourceful treatment, and particularly relates to a method for synergistically extracting silica gel by removing SO2 in flue gas through steel slag. The invention provides a method for synergistically extracting silica gel by using steel slag to remove SO2 in flue gas, which comprises the following steps: mixing steel slag and water, and carrying out hydrolysis reaction to obtain slurry; the slurry is in contact with flue gas to be treated, the flue gas is subjected to desulfurization treatment, sulfur-containing slurry is obtained, and the flue gas comprises SO2 and O2; performing solid-liquid separation on the sulfur-containing slurry to obtain a solid-phase product and a liquid-phase product; and carrying out dialysis purification on the liquid-phase product, and drying the obtained dialysate to obtain the silica gel. According to the method, SO2 in the flue gas is treated by using the steel slag to synergistically extract the silica gel, so that the low-cost and high-efficiency flue gas desulfurization requirements of a thermal power plant are met, a silica gel product with a high additional value can be co-produced, and resource utilization of the steel slag and the sulfur-containing flue gas is synchronously realized.

The invention relates to a multifunctional dry powder type coal adhesive. The coal adhesive comprises, by weight, 30-80 parts of an adhesive, 5-40 parts of a high-temperature reinforcing agent, 0.5-10parts of a regulator, 1-20 parts of a combustion-supporting ash-removing agent, 1-20 parts of a sulfur-fixing smoke-eliminating agent and 1-10 parts of an accelerant. The invention also relates to apreparation method of the adhesive and briquette coal containing the adhesive. The additives are low in cost and small in addition quantity, and the prepared briquette coal has the advantages of beinghigh in compressive strength, good in water resistance, free of drying, good in combustion-supporting catalysis, high in decoking and ash removal rate and obvious in sulfur fixation effect.

The invention provides a deep compounding sulphur-fixing agent applicable to low sulfur content barbecue coal, wherein the deep compounding sulphur-fixing agent is prepared from, by weight, 80-90 parts of calcium-based basic aggregate agent, 3-7 parts of salt additive, 3-5 parts of metal oxide additive, and 2-5 parts of reaction catalyst, wherein the calcium-based basic aggregate agent comprises calcium oxide, calcium hydroxide and calcium carbonate; the salt additive comprises potassium carbonate, sodium carbonate and sodium chloride; the metal oxide additive comprises aluminium oxide, iron trioxide and magnesium oxide; the reaction catalyst comprises potassium chlorate and ethylene glycol monoethyl ether. The compound sulphur-fixing agent realizes the in-depth sulphur fixing of the coal when the barbecue coal is prepared by the low sulphur coal type, effectively solves the problem of odor generation easily during the combustion of the barbecue coal; the components are simple and easy to acquire, low in cost, and suitable for industrial production.

The invention provides a coke powder combusting method, comprising: combusting the coke powder in order through low-speed bed and high-speed bed at 0.3-3m / s and 3-25m / s, respectively; separating the combusted coke powder from gas through gas-solid separator and making the solid powder enter in heat-absorbing fluidized bed to reduce the temperature of the solid powder; making the solid powder enter in mixing segment and mix with fresh coke powder, and entering in circulating combustion again; thus, it can completely combust coke powders of different sizes and its combusting efficiency and sulfur-fixing rate are both largely improved.

The invention provides a circulating fluidized bed boiler flue gas desulfurizing system and a treatment method thereof. The system comprises a circulating fluidized bed boiler and a desulfurizing fluidized bed. A flue gas outlet of the circulating fluidized bed boiler is connected with a gas inlet formed in the bottom of the desulfurizing fluidized bed, and the bottom of the desulfurizing fluidized bed is provided with a desulfurizer inlet. The system is provided with the desulfurizing fluidized bed behind the circulating fluidized bed boiler, a sulfur fixation reaction is transferred to the region with the stable and proper temperature, the influences of temperature changes and atmosphere in the hearth on sulfur fixation reactions and products thereof are eliminated, and by arranging a separator and a return feeder, the desulfurizer is recycled; the accumulation effect in the circulating process is used for enhancing the sulfur fixation reaction, the desulfurizing cost is lowered, andthe desulfurizer utilization rate and desulfurizing efficiency are improved.

The invention relates to the technical field of coal processing, and discloses a briquette binder, a preparation method and applications thereof, wherein the briquette binder comprises coking coal pitch, a biomass modification material, an inorganic magnesium-based curing agent and an auxiliary agent according to a weight ratio of (5-20):(8-25):(0.5-5):(0.1-0.3), wherein the auxiliary agent comprises at least one selected from a surfactant, a pore forming agent, a dehydrating agent and a cross-linking agent. According to the present invention, under the synergistic effect of various components, the briquette binder can complete the pulverized coal cementation process, the formed briquette can meet the industrial coal demand, the waste in the industrial and agricultural production process is solved, and the efficient use of resources is improved; and by adding the inorganic magnesium-based curing agent and the auxiliary agent, the strength and the impermeability of the briquette are enhanced, the combustion of the briquette is promoted, and the good sulfur fixation effect is provided.

The invention discloses a fly ash-based high-sulfur-fixation coal binder and a preparation method and application thereof, the fly ash-based high-sulfur-fixation coal binder is prepared by mixing a binder, an auxiliary material and fly ash according to a certain ratio, the binder plays a role in binding coal powder, and effective components in the auxiliary material and the coal ash play a role in sulfur fixation, the binder and pulverized coal are subjected to extrusion forming and drying to prepare the high-sulfur-fixation coal briquette, the binder has very high pulverized coal bonding capacity, and meanwhile, the prepared coal briquette also has relatively good mechanical strength. The method has the characteristics of wide raw material source and simple process, finds a convenient way for comprehensive utilization of the fly ash, reduces the cost of treating the fly ash as a solid waste traditionally, improves the market value of the fly ash, and has good application value.

The invention relates to the field of fuel coal additives, in particular to a method for preparing coal economizing agents. The method has the advantages that multi-walled carbon nano-tubes are used as carriers, Van Der Waals force is available between carbon atoms in the multi-walled carbon nano-tubes and oxygen molecules, the oxygen molecules are restrained on the surfaces of the multi-walled carbon nano-tubes, thermal movement of the oxygen molecules is intensified when the temperatures are increased, accordingly, the oxygen molecules have high kinetic energy, restraint effects of the Van Der Waals force between the oxygen molecules and the multi-walled carbon nano-tubes are broken through by a large portion of the oxygen molecules, the oxygen molecules can be separated from the surfaces of the multi-walled carbon nano-tubes, and oxygen can be released; the coal economizing agents are modified by surfactants and are fabricated by chitosan, the chitosan is adsorptive, connection between the multi-walled carbon nano-tubes and active components-catalysts can be improved by the surfactants, acting force of the multi-walled carbon nano-tubes and the active components can be enhanced,the active components are difficult to dissolve and release, the actual loading of the active components can be increased, accordingly, the efficiency of boilers further can be improved, and coal canbe saved to a great extent.

The invention discloses a method for improving the sulfur fixation rate in coal pyrolysis by using an ash heat carrier. The method comprises the following specific steps: 1, dissolving a water-soluble calcium salt and / or a water-soluble zinc salt in water to prepare a treatment solution, soaking coal ash after combustion in a power plant in the treatment solution for 20-30 minutes, and drying for later use; 2, mixing a certain amount of raw material coal with the treated coal ash, performing pyrolysis under the condition of air isolation, and inhibiting separation of sulfur-containing compound gas in coal pyrolysis to obtain clean pyrolysis gas; and 3, completely soaking pyrolyzed semi-coke or coke in an acid solution for 1-3 hours, dissolving sulfur in the coal out of the acid solution, and washing to remove coal ash mixed in the coal after soaking so as to remove most sulfur in the coal and obtain clean semi-coke or coke. The method provided by the invention can reduce the emission of sulfur oxides in the pyrolysis gas generated during coal pyrolysis, is simple, has easily controlled process conditions, and has multiple benefits of environmental protection, economy and the like.

The invention provides a desulfurization and denitration combustion improver in blast furnace coal injecting as well as a preparation method and a using method thereof. The desulfurization and denitration combustion improver is prepared from the following raw materials in percentage by weight: 18 to 23 percent of manganese dioxide, 5 to 8 percent of ferric oxide, 9 to 13 percent of barium carbonate, 10 to 16 percent of calcium oxide, 5 to 8 percent of sodium carbonate, 10 to 16 percent of rare earth oxide, 2 to 6 percent of titanium dioxide, 3 to 6 percent of potassium nitrate and the balanceof activated carbon; the rare earth oxide is prepared from the following raw materials in percentage by weight: 40 to 55 percent of yttrium oxide, 25 to 35 percent of lanthanum oxide and 20 to 30 percent of indium oxide; the average particle diameter of the rare earth oxide is 10 to 40 mum. The desulfurization and denitration combustion improver provided by the invention has a remarkable combustion-supporting effect on pulverized coal, the combustion efficiency of the pulverized coal can be effectively improved, emission of NOx and SOx can be effectively reduced, and the purposes of energy conservation and emission reduction can be achieved.

The invention relates to clean molded coal with a steel slag checking tailing additive and a preparation method thereof, and belongs to the field of clean coal application. The clean molded coal comprises, by mass, 60-85% of coal powder, 5-20% of coke powder, 3-12% of steel slag checking tailings and 5-10% of low-temperature activated steel slag checking tailings. The clean molded coal realizes high efficiency resource comprehensive utilization of steel slag checking tailings, greatly reduces environmental pollution caused by lime production and cement production, and reduces high-quality electric power consumption and land resource destroy. Steel slag checking tailings replace a common molded coal additive so that a clay use amount is reduced and land resource destroy is reduced. Molded coal combustion is clean and a molded coal making cost is low.

The invention relates to the field of fuel coal additives, in particular to a method for preparing coal economizing agents. The method has the advantages that multi-walled carbon nano-tubes are used as carriers, Van Der Waals force is available between carbon atoms in the multi-walled carbon nano-tubes and oxygen molecules, the oxygen molecules are restrained on the surfaces of the multi-walled carbon nano-tubes, thermal movement of the oxygen molecules is intensified when the temperatures are increased, accordingly, the oxygen molecules have high kinetic energy, restraint effects of the Van Der Waals force between the oxygen molecules and the multi-walled carbon nano-tubes are broken through by a large portion of the oxygen molecules, the oxygen molecules can be separated from the surfaces of the multi-walled carbon nano-tubes, and oxygen can be released; the coal economizing agents are modified by surfactants and are fabricated by chitosan, the chitosan is adsorptive, connection between the multi-walled carbon nano-tubes and active components-catalysts can be improved by the surfactants, acting force of the multi-walled carbon nano-tubes and the active components can be enhanced,the active components are difficult to dissolve and release, the actual loading of the active components can be increased, accordingly, the efficiency of boilers further can be improved, and coal canbe saved to a great extent.

The invention relates to a composite sulfur-fixing agent used for coal combustion as well as a composite sulfur-fixing coal water slurry and a method for simultaneously performing sintering and fixingsulfur in a furnace. The composite sulfur-fixing agent used for the coal combustion includes calcium carbonate and sodium carbonate, wherein the content of sodium carbonate is 1-2wt% of that of the calcium carbonate. When the above composite sulfur-fixing agent used for the coal combustion provided by the invention is adopted, a higher sulfur fixation rate can be realized.

The invention discloses a high-temperature sulphur-fixing agent which is prepared from the following components in parts by weight: 4-7 parts of kaolin, 3-6 parts of kieselguhr, 2-4 parts of anorthite, 2-5 parts of talcum powder, 7-9 parts of calcium oxide, 1-3 parts of zinc oxide, 4-8 parts of strontium carbonate, 3-8 parts of barium hydroxide, 0.3-0.5 part of potassium sulphate, 0.2-0.5 part of vanadium pentoxide, 4-9 parts of niobium pentoxide, 0.3-0.6 part of aluminite powder, 0.2-0.5 part of iron powder microballoon sphere, 0.1-0.3 part of calcium titanate, 20-25 parts of ethyl alcohol, 2-4 parts of sodium dodecyl benzene sulfonate, 1-3 parts of nanometer titania and 2-4 parts of nano calcium carbonate. The sulphur-fixing agent disclosed by the invention has a reasonable prescription, is high temperature resistant, good in high-temperature desulfurization effect, and favorable in development prospect of coal sulphur fixing.

The invention discloses multifunctional high-efficiency gas-making molded coal and a preparation method thereof. The multifunctional high-efficiency gas-making molded coal is composed of powdered coal, an adhesion agent and water, and comprises the component ratios calculated according to the weight parts: 84-87 parts of the powdered coal, 10-13 parts of water, and 2-3 parts of the adhesion agent. The preparation method of the multifunctional high-efficiency gas-making molded coal comprises the following steps: after mixing evenly pottery clay, calcium hydroxide, petroleum coke powder, ammonium bicarbonate and cement to prepare the adhesion agent, stirring evenly the adhesion agent with water and the powdered coal for extrusion molding, then sending into a drying oven, and drying at the temperature of 180-220 DEG C for 2-3 hours to obtain the molded coal. The molded coal has high fixed carbon content, and improves the gas producing amount and the gas producing efficiency; the molded coal has high cold and heat strength, ensures convenient storage and transportation, is not broken into pieces when being put into a furnace, and does not come loose at the high temperature; the molded coal has low ash slag content and good sulfur fixation effect, thereby reducing the pollution of the environment; and the preparation method has the advantages of simple operation and convenient preparation.

The invention provides a high-efficiency sulfur-fixation coal briquette composite adhesive which is compounded from sodium humate, limestone, slaked lime, sodium carbonate, sodium chloride, potassium permanganate and ferrous chloride. In the briquette coal adhesive, various raw materials cooperate with each other and promote each other, and thus, the coal briquette adhesive has the advantages of high bonding property, high sulfur fixation rate and favorable combustion-supporting property. As for any coal type with the sulfur content of lower than 2%, the sulfur fixation rate of 90% can be reached when the addition amount of the composite adhesive is 13-15%; and thus, the composite adhesive has wide adaptability. The strength, heat stability, heating value and other indexes of the coal briquette respectively satisfy the Standard for Coal Briquette for Civilian Use.