31 results about "Sub-bituminous coal" patented technology

In the invention, two kinds of waste material dry dust discharging coal ash and desulfurize gyp produced by power plant burning sub-bituminous coal or lignitous coal are used as main composition, shell and or cement, calcined gypsum and aluminum sulfate or alunite are used as secondary composition, they are prepared to dry powder soil curing agent by weighing, matching, forced stirring and mixing. The soil can be concreted by mixing a proper quantity of curing agent into the soil and processes of stirring, compacting, soaking and maintaining.

The invention provides a new technology of thermal solution extraction of high-sulfur fertilizer coal and application thereof in coking coal blending. In the new technology, the high-sulfur fertilizer coal is continuously treated by thermal extraction in a fixed bed reactor or thermal solution extraction in a clearance type reaction still with an organic solvent under proper conditions, after thermal state filtering and separation, a high yield high-sulfur and low-ash thermal solution product is obtained, and the product is used for coking coal blending. By such thermal solution extraction, all the ash component and inorganic sulfur of the thermal solution product are removed, in comparison with the original high-sulfur fertilizer coal, the cohesiveness of the thermal solution product is improved, the sulfur content is reduced obviously, the sulfur is completely the organic sulfur, and the organic sulfur is easy to remove in the subsequent coking process. With the thermal solution product used in the coking coal blending process, the coke quality can be improved obviously, the sulfur content of the coke is lowered, or on the premise of guaranteeing the coke quality, the non-coking coals, such as the subbituminous coal, can be properly added, so that the coal blending coking cost can be lowered, and the coking coal source is stabilized and expanded.

A process to irreversibly dry and passivate lignitic coal, sub-bituminous coal, bituminous coal, or coal char by heating the coal material in the presence of a gas comprised of less than about five volume percent of oxygen (an inert environment) until the coal material has a moisture content of from about 0.01 to about 20 weight percent, heating the partially dried coal material to 100 to about 600 degrees Fahrenheit, charging the heated partially dried coal material to a fluidized bed reactor; feeding air into the fluidized bed reactor; contacting the heated partially dried coal material with the air while maintaining the heated partially dried coal material at a temperature of from about 450 to about 650 degrees Fahrenheit; and, thereafter, removing water from the heated partially dried coal material until no more than about 1 weight percent of water remains in the heated partially dried coal material.

A method of cement clinker manufacture comprises feeding a clinker feed material containing a source of calcium carbonate into a feed end of a cement kiln, the feed material is heat processed in the kiln to produce cement clinker with emission of carbon dioxide from thermal decomposition of said source of calcium carbonate and discharge of the carbon dioxide from the kiln, and cement clinker is discharged from a discharge end of the kiln; a coal ash derived from burning pulverized lignite or sub-bituminous coal is included in the feed material fed into the feed end to replace a portion of the source of calcium carbonate, and provides a source of calcium as well as other components notably silicon and aluminium, in the formation of the cement clinker, with a lowering of the emission of carbon dioxide in the kiln, per unit weight of cement clinker produced.

The present invention generally relates to a catalytic gasification of coal. Catalytic gasification of a Wyodak low-sulfur sub-bituminous coal from the Powder River Basin of Wyoming was investigated using an inexpensive sodium carbonate catalyst applied via incipient wetness impregnation. Experiments in an atmospheric pressure fixed-bed laboratory gasifier were performed to evaluate the effects of reaction temperature, feed gas steam content, and Na₂CO₃ loading on the catalytic gasification of the Wyodak coal. The temperature range investigated (700-900° C.) was selected with consideration of the Na₂CO₃ melting point (850° C.) to reduce the loss by volatilization of sodium. Sodium was found to be active during both pyrolysis and gasification steps. The catalyst was most cost-effective at addition levels of approximately 3 wt %. The random pore model provided a good fit to the conversion versus time data collected under both the catalytic and the uncatalytic conditions.

The invention discloses low-temperature drying and coal conveying integrated equipment for raw coal and belongs to the field of raw coal drying equipment. In a coal conveying room, a double-layer closed space is formed by an equipment outer shell and an equipment inner shell, air introduction pipelines are connected with the drying equipment inner shell, first water medium heaters are arranged at junctions of the air introduction pipelines and the drying equipment inner shell, a supporting structure, a second water medium heater and a rotating shaft are sequentially arranged inside a crawler from top to bottom, and thus, the low-temperature drying and coal conveying integrated equipment for the raw coal is formed; an outlet of the low-temperature drying and coal conveying integrated equipment is connected with a coal bunker, and external moisture drying for lignite, sub-bituminous coal and bituminous coal is completed while coal granules are conveyed; air drying tail gas is conveyed to chimneys with baffles through an air pipeline and then is exhausted into the atmosphere. According to the low-temperature drying and coal conveying integrated equipment for the raw coal, disclosed by the invention, the external moisture drying for the raw coal (lignite, sub-bituminous coal and bituminous coal) can be completed by using low-temperature drying heat sources of different types while the coal granules are conveyed, so that the efficiency of an electric power plant is increased.

A method for producing a carbon fiber includes a separation step of separating an ash-free coal obtained from a bituminous coal or a sub-bituminous coal, into a soluble component(s) and an insoluble component(s) by a solvent extraction treatment, a heat treatment step of heat-treating the soluble component(s), a melt spinning step of melt-spinning the soluble component(s) subjected to the heat treatment, an infusibilization step of infusibilizing a filament body obtained by the melt spinning, and a carbonization step of carbonizing the filament body subjected to the infusibilization.

The invention provides a poly-generation apparatus and method using low nitrogen oxides in coal gas for combustion power generation. According to the invention, one or more low rank coal selected from the group consisting of brown coal, long flame coal, sub-bituminous coal and soft coal are added into a fine coal upgrading conversion reactor for rapid conversion, crude coal gas produced after conversion undergoes dedusting and purifying, oil-gas separation, and desulphurization and purification; and purified coal gas is successively injected into a boiler for combustion through graded combustion nozzles. Compared with the prior art, the invention has the following advantages: a desired air excess coefficient is small, combustion temperature is lower than a typical temperature--1400 DEG C at which a great amount of thermal NOx is produced, so production of thermal NOx in the process of combustion is radically inhibited and production of fuel NOx and rapid NOx is avoided; the concentration of respirable particulates like SO2, PM2.5 and PM10 in combustion flue gas is extremely low, and ultra-low concentration discharge of SO2 and NOx can be realized; and the combustion flue gas is almost free of heavy metals like lead, chromium, cadmium, arsenic and mercury.

The invention discloses a preparation method of a low-rank coal-based superplasticizer, and belongs to the technical field of low-rank coal resource utilization and fine chemical engineering. Low-rank coal such as lignite and sub-bituminous coal is used as raw materials, sulfonated coal is obtained through sulfite sulfonation, sulfonated coal-based humic acid is obtained through sulfonated coal liquid-phase oxidative cracking, and finally the obtained sulfonated coal-based humic acid is subjected to formaldehyde polycondensation to synthesize the coal-based humic acid high-efficiency water reducing agent. The method for synthesizing the high-efficiency water reducing agent by taking the low-rank coal such as the lignite and the sub-bituminous coal as the raw materials has the characteristics of high yield of sulfonated coal-based humic acid and the water reducing agent, low cost, clean process and the like, the synthesized coal-based humic acid water reducing agent has good dispersing, water reducing and slump retaining properties, and the water reducing effect is superior to that of a commercially available naphthalene high-efficiency water reducing agent. Under the condition that the mixing amount is 0.4%, the highest water reducing rate can reach 24.5%, the initial cement paste fluidity is 162 mm, the mortar fluidity is 305 mm, and the mortar fluidity loss rate within 2 h is 6.9%.

Provided is a production method that is for a briquette and that comprises a step for obtaining a briquette having a water content of 5 wt% or less by molding a molding raw material containing a powder carbonized coal and a binder and drying the same at 60-100 DEG C. The binder contains an aqueous solution of a polyvinyl alcohol having a saponification degree of more than 99.3 mol% and a polymerization degree of 1700 or more. The powder carbonized coal is a pulverized coal obtained by drying and carbonizing a coal including brown coal and/or subbituminous coal.

The invention discloses a preparation method of high-adsorptivity coal-base pressed block activated carbon. The preparation method comprises the following steps: carrying out coal blending on 60-80 wt% of main coal, 10-20 wt% of sub-bituminous coal and 10-20 wt% of gas-fat coal, and pulverizing to obtain raw material coal, wherein the main coal is non-caking coal and/or jet coal; and carrying out pressure molding and granulation on the obtained raw material coal, and carrying out oxidation treatment, carbonizing treatment and activating treatment, thereby obtaining the activated carbon. The activated carbon, which is prepared by carrying out coal blending on certain amounts of the main coal, sub-bituminous coal and gas-fat coal, well combines the properties and interactions of the coals. Compared with the traditional coal-base activated carbon, the adsorptivity of the high-adsorptivity coal-base pressed block activated carbon is obviously enhanced, thereby solving the common problem of poor adsorptivity in the traditional coal-base pressed block activated carbon production process.

The invention relates to an explosion-proof dust suppressant for coal dust and a preparation method thereof. The dust suppressant is prepared from the following raw materials in percentage by mass: 10 to 30 percent of molasses, 0.1 to 0.5 percent of a nonionic surfactant, and 5 to 10 percent of starch-based super absorbent resin (SAP), with the balance being water and a trace pH neutralizer Ca(OH)2. More than 99.5% of the components of the dust suppressant are environment-friendly degradable materials,and the molasses is a byproduct in the sugar industry and is a main material of the dust suppressant, so the dust suppressant has the characteristics of low price, environment friendliness and degradability. The dust suppressant has the functions of wetting, bonding, moisturizing and explosion suppression on coal dust. On-site actual measurement shows that the inhibition rate of the dust suppressant on deposited coal dust in an underground return airway is not lower than 62.86% within three days; and the inhibition rates of the dust suppressant on the explosion indexes of sub-bituminous coal, bituminous coal and anthracite coal dust are 57.45%, 51.47% and 76.98% respectively.

Provided is a method for producing a molded fuel. The method comprises a carbonization step of carbonizing a coal containing at least one of brown coal and subbituminous coal to produce a carbonized coal; and a molding step of molding a mixture containing the carbonized coal and a biomass semi-carbide produced by the semi-carbonization of a biomass to produce the molded fuel. Also provided is a molded fuel comprising a carbonized coal produced from a coal containing at least one of brown coal and subbituminous coal; and a biomass semi-carbide.

A raw material pitch for carbon fiber production, with which carbon fiber excellent in tensile strength can be produced at relatively low costs, is provided. The raw material pitch is obtained from coal, is a pitch for producing carbon fiber by melt spinning, and contains oxygen in a content of 1.0% by mass or more and a toluene-soluble component in a content of 20% by mass or more. The coal is preferably bituminous coal or sub-bituminous coal. The raw material pitch is preferably prepared by subjecting a solvent-soluble component separated from a thermal decomposition product of coal in a solvent by a solvent extraction treatment at a temperature of less than 300° C. to a heat treatment at a temperature of 150° C. or more.