5587 results about "Coal gas" patented technology

The invention provides a method for preparing hydrogen and LNG from coke oven gas. The method comprises the following steps: electric decoking; boosting of the coke oven gas by a compression system; cooling of the raw gas coke oven gas by using the BOG gas (the BOG gas is a gas formed after the passive heating gasification of LNG) of LNG in order to further remove tar, benzene, naphthalene and like substances in the coke oven gas; and pretreatment using a TSA process to finely remove macromolecular impurities, such as tar, benzene, naphthalene and the like; wet and dry two-stage desulfurization for removing sulfides in the coke oven gas; two-stage low pressure shifting for a reaction of CO and water vapor to form CO2 and hydrogen; and pressurization using a compressor, an MDEA solution process for removing carbon dioxide, a membrane separation technology for separating hydrogen and methane, separation, concentration and purification of the hydrogen and methane, and dehydration, demercuration and liquefaction of the separated high-concentration methane to obtain the LNG. The coke oven gas is finally converted into the hydrogen and the LNG which have high values, so the energy of thecoke oven gas is fully used, and the environment is protected.

The invention discloses a coking furnace capable of recycling heat energy, and the coking furnace comprises a furnace body, an exhaust gas recycling system and a raw coal gas treatment system, wherein the furnace body sequentially comprises a coal feeding segment, a rapid coal heating segment, a raw coal gas leading-out segment, a coal carbonization coking segment, a coke quenching and tempering segment, a dry coke quenching segment and a coke discharging segment from top to bottom; the exhaust gas recycling system comprises an exhaust gas leading-out unit, an exhaust gas heat exchanger, a commutator and the like; and the raw coal gas treatment system comprises a raw coal gas leading-out unit. By using the coking furnace disclosed by the invention, continuous coal carbonization coking canbe achieved and the exhaust gas after combustion is used for dry coke quenching in the furnace; pre-dried coal can be quickly heated to 300 DEG C during entering the furnace, the coal is carbonized and coked in the furnace body, and the exhaust gas generated by self-combustion is used for dry coke quenching at the furnace bottom after the exhaust gas is cooled by heat exchange with air, thus continuously producing coke; the pollution is less in the production process; the coal industrial chain is extended, the coking cost is lowered, the coking coal types are broadened, and the product quality is improved; the profit margins are expanded in a large extent; and the maintenance cost is low.

The invention relates to a coal-gas outburst simulation platform for processing coal-gas outburst simulation researches under different coal bed inclinations, different ground stresses and different gas pressures, and researching the transmission rule and attenuation character of acoustic emission signal in the outburst process. The invention uses a plurality of hydraulic jacks to axially jack coal sample, uses an aeration port to charge gas into the coal sample, and can simulate the protruded stress concentrated zone caused by underground coal face, to simulate the outburst condition of coal and gas. The protruded port of the device via a quick release device can realize mechanical automatic control, to quickly open the protruded port to instantly release pressure at the protruded end and eliminate the effect on the protruding energy by manually opening the protruded port, to simulate on-site protrusion actually.

Disclosed is a method which uses coke-oven gas as the raw material to produce liquefied natural gas; the method includes that the coke-oven gas is pretreated firstly to enable the tar, naphthalene and benzene impurities contained in the coke-oven gas to be purified deeply; and the purified coke-oven gas is processed with methanation reaction after compression and desulfurization; the liquefied natural gas product which contains CH4 with the content of more than 85% through the cryogenic separation process; the residual non-condensable gas is prepared to obtain the hydrogen with the purity of 99% through the PSA separation technique; the residual desorbed gas can be used as manufactured gas. The method which uses the coke-oven gas as the raw material to produce liquefied natural gas has the advantages of making full use of the compositions, saving energy, water and the investment, simple process and realizing the trinity coordinated development of economy, environment and energy sources.

A method for synthesizing and producing natural gas by hydrogen of coal gas and its synthesizer are disclosed. The process is carried out by purifying tar, crude removing sulfur, ammonia, benzene and naphthalene, compressing to 0.5-5.0 MPa, removing sulfur impurities, supplementing carbon 5-20 wt%, and methanation reacting to obtain final product. It saves energy resources and has no environmental pollution.

The invention relates to a reclaiming system and a process for low-temperature methanol washing integrated Claus sulfur of coal gas and natural gas. The system is additionally provided with a Claus tail gas washing tower and uses sulfur-free methanol saturated by CO2 from a CO2 product tower as a washing agent, and the washed liquid returns to an H2S concentrating tower; through combination of heating, gas stripping and pressure adjustment, concentration of H2S in acid gas washed by methanol is adjusted flexibly; at the same time, the system is additionally provided with a tail gas pre-heater before hydrogenation reaction to compensate heat loss of a hydrogenation reaction system. The process mainly comprises the following steps: removing H2S-CO2 gas, condensing H2S, reclaiming Claus sulfur, hydrogenising and reducing the gas, selectively absorbing and desulfurizing saturated cold methanol. The process has the advantages that the process can efficiently, flexibly, safely and energy-conservatively treat carbonyl gas with different pressures, temperatures, water content and sulfur concentration; and total sulfur reclamation ratio can reach more than 99.9 percent. The concentration of the H2S in emptied tail gas is below 25 mg/Nm3, so the H2S gas can meet the requirement of environmental protection, and can be exhausted directly without being burnt.

The invention discloses a process for integrally heated continuous preparing biomass pyrolysis gasification gas and a rotary furnace utilized by the same. At a furnace tail cooling section, red charcoal at a temperature of 600-800 DEG C after pyrolyzing and destructive distilling reacts with steam generated by cooling spray water on the lower portion in the furnace so as to absorb large quantities of heat and simultaneously generate water gas and semi-water gas. Heat generated by burning recycled gas and air is used for maintaining pyrolysis temperature of biomass material layers and providesenough heat for further, pyrolysis, destructive distillation and steam decomposition reaction. By aid of the heat, biomass inside the furnace is pyrolyzed and destructively distilled to generate large quantities of volatile matters, and the biomass is gradually heated to decompose destructive gas with high heat value. The rotary furnace utilizes a three-section design: a first section is a furnace head preheating section, which is mainly used for preheating and drying raw materials, a second section is a rotary furnace body pyrolysis section, which is mainly used for pyrolysis and destructivedistillation and is a core operation portion of the furnace, and a third section is a furnace tail cooling section, which is mainly used for cooling charcoal. Prepared gas is high in heat value, and devices occupy small space.

The invention relates to coal gas-steam cogeneration method and opposite furnace. Wherein, fuel burns in combustion chamber to generate smoke gas, the latter enters heat exchanger after cyclone separator to generate steam; some cycle dust collected by cyclone separator returns to chamber, other enters vaporizer; fuel takes pyrogenic gasification reaction to generate coal gas with reacted product back to chamber; the cogeneration furnace has double-cycle fluidized bed loop, wherein, the burning loop composes of a chamber, a smoke gas separator, and a refeeding device; the gasification loop composes of a gasification room, a coal gas separator, and a refeeding device; two loops are coupled by hot dust allocator and refeeding device. The running mode is flexible, and also fit to treat carbon-containing waste.

The invention discloses a three-fluidized-bed solid heat carrier coal pyrolysis, gasification and combustion cascade utilization method. The method comprises the following steps of: mixing coal and high temperature circulating ash serving as a solid heat carrier in a fluidized bed pyrolysis furnace, pyrolyzing to separate out volatile, cooling and separating the volatile to obtain tar and pyrolysis gas, conveying pyrolysis semi-coke generated by pyrolyzing the coal to a fluidized bed gasification furnace, performing gasification reaction by using water vapor and O2 as gasification agents to prepare synthesis gas, conveying the semi-coke which is incompletely gasified in the gasification furnace to a circulating fluidized bed combustion furnace, blowing air for the conventional combustion or blowing O2/CO2 for oxygen-enriched combustion, heating the circulating ash serving as the solid heat carrier, and producing gasification agent vapor required by the gasification furnace by using high temperature flue gas generated by combustion. The method has the advantages that: the tar, the pyrolysis gas and the synthesis gas are co-produced through coal pyrolysis, gasification and combustion cascade utilization, the gasification condition of the semi-coke is reduced, and good economic benefits and social benefits are achieved.

The invention relates to a comprehensive utilization synthesis process of natural gas employing methanation of coke oven gas, belonging to the technical field of new energy utilization. The process comprises the following steps: compressing coke oven gas, preliminary cleaning, removing sulfur, performing first section methanation, performing second section methanation and separating natural gas toprepare natural gas which reaches the grade A technological requirements of natural gas national standard (GB17820-1999). The synthesis process of natural gas employing methanation of coke oven gas reaches the aim of high effective comprehensive utilization of natural gas and provides a new way of preparing and synthesizing natural gas.

The invention relates to an automatic control system during the combustion process of a hot air furnace of a blast furnace, belonging to the field of automatic combustion control technique of the hot air furnace of the blast furnace. Firstly, the system self-learns the historical combustion data of the furnace according to the specified conditions, and determines the best coal gas and air flux of the furnace and the best initial openness of an adjusting valve to be as the initial parameters of the next combustion period. During the normal combustion stage, a control method that fuzzy control is combined with self-optimization control is adopted, the fastest increment of the temperature at the arch is taken as the object, and the air combustion proportion coefficient is quickly optimized according to the temperature change of the combustion chamber. Simultaneously, by adopting a non-difference self-adaptive single closed ring control system combined with the methods such as fuzzy control, self-learning and pulse driving and the like, the action of the adjusting valve can be effectively controlled, and precise and quick adjustment and control of the flux are realized. According to the trend change of the temperature of the waste gas, the system adopts the fuzzy control arithmetic to control the combustion rhythm. Simultaneously, the system comprehensively summarizes the manual combustion experience and achieves the object of completely automatic control without man-watching during the whole combustion process.

The present invention relates to an air-contained coal gas gasification and separation process, which is chiefly to passing over the air-contained coalbed gas to the middle of the fractionating tower after cooling, through the evaporation of the evaporator in the bottom of the fractionating tower and the condensation of the top condenser, gas fraction inside the inner of the tower, the sufficient quality and heat exchange of the liquid fraction. The high purity nitrogen gas is obtained in the top of the fractionating tower and the high purity liquid natural gas is obtained in the bottom of the fractionating tower, wherein one part of pure air is induced to the heat exchanger at the entrance between the top of the fractionating tower and the air-contained coalbed gas. The invention also provides an equipment of the separation process. The air-contained coal gas gasification and separation process and equipment are separation liquefaction process specially designed for the air-contained coalbed gas, which adopts the single stage rectifying still simpler than the doublestage rectifying, and has convenient operation, low cost and easy to popularize in large scale.

The invention relates to a poly-generation technique for using coal gas and coke oven gas as raw materials. The poly-generation technique comprises the following steps of: carrying out mixing on part of H2 prepared by purified water gas and coke oven gas through pressure swing adsorption and tail gas obtained by Fischer-Tropsch synthesis, carrying out Fischer-Tropsch synthesis and obtaining hydrocarbon mixture and tail gas. The CO2 separated from tail gas separate by first pressure swing adsorption enters a urea synthesis unit for reaction, the CO and the hydrogen respectively obtained by separation of second pressure swing adsorption and third pressure swing adsorption of the residual tail gas are circulated back to a Fischer-Tropsch synthesis unit for reaction; and the residual gases can be used for generating power or obtaining SNG by secondary condensation. The coke oven gas enters pressure swing adsorption after being purified and desulphurized so as to separate H2; wherein one part of H2 is used as supplementation of H2 needed by Fischer-Tropsch synthesis and the other part of H2 is mixed with N2 for ammonia synthesis so as to obtain synthetic ammonia; and the synthetic ammonia is mixed with CO2 obtained by the first condensation and CO2 separated from the Fischer-Tropsch synthesis for urea synthesis so as to obtain urea. The CO2 separated from the first condensation of desorption gas by pressure swing adsorption of the coke oven gas is used for urea synthesis; and the residual gases is treated by the second condensation to obtain SNG and mixed gas of CO and N2. The invention has no emission of greenhouse gases, uses richness in carbon and deficiency in hydrogen of the coal gas and the richness in hydrogen and deficiency in carbon of the coke oven gas to carry out complementation, realizes modulation of product structure by Fischer-Tropsch synthesis and improves the economical efficiency of the process of Fischer-Tropsch synthesis.

The invention discloses a method for reducing vanadium-titanium magnetite powder by coal reducing gas and fluidized beds. High temperature coal gas produced by a coal reducing gas system is mixed with gas of a reducing exhaust gas purification system to form reducing gas, and the reducing gas enters third-stage, second-stage and first-stage reduction fluidized beds in turn; the preheated vanadium-titanium magnetite powder enters the first-stage, second-stage and third-stage reduction fluidized beds in turn and is fluidized and subjected to reduction reaction under the action of the reversely upward reducing gas; and the obtained directly reduced iron is briquetted, titanium slag is removed, vanadium slag is extracted, and the qualified molten steel is produced. The invention integrates process modules such as coal reducing gas, iron ore powder preheating, fluidized bed reducing, briquetting, electric furnace melting separation and the like, and has the advantages of high production thermal efficiency, low cost of preparing the reducing gas, short time of reducing the iron ore powder and the like.

The invention provides a biological mass thermal decomposition, gasification and purification method which comprises, disintegrating the biological mass, gasifying in a furnace, obtaining retort gas, cyclone dedusting, cooling down and purifying, high voltage static coke trapping, making the coke tar bubbles and dust in the coal gas deposit onto the coke collection poles, thus purifying the coal gas, finally washing and dewatering.

The present invention relates to energy source apparatus, and is one kind of simple biomass-coal mixture gasifying method and apparatus capable of producing high heat value gas and no tar. Inside fluidized bed gasifying furnace, biomass and coal as gasified material is burnt and gasified intermittently. In the burning stage, coal and blast are supplied to the furnace, so that coal is burnt in fluidizing state to produce heat; in the gasifying stage, vapor and biomass are supplied to the furnace, so that the high temperature carbon material layer produces water gas reaction in fluidizing state and biomass is dry distilled and pyrolyzed at high temperature to produce high heat value gas, which is cooled and made to enter the gas purifying system. By combining of biomass and coal with different advantages, the present invention produces high heat value fuel gas without tar.

The invention relates to the field of coal coking production, in particular to a method for realizing methanation of coke oven gas through carbon-replenishing hydrogen-returning process for synthetic natural gas. The method comprises: pressurizing purified coke oven gas to 1 MPa; raising temperature to 250 DEG C for heat exchange; under the action of catalysts, performing three-stage methanation reaction of CO2 recycled by a low-partial-pressure system added with flue gas and H2 obtained through the separation of a membrane separation device after methanation to obtain synthetic gas of which the concentration of methane is over 94 percent. The method adopts a low-pressure non-cyclic methanation process, and the reaction temperature of the method is as follows: a primary stage is at 600 DEG C; a carbon-replenishing hydrogen-returning stage is at about 500 DEG C; a final stage is at 360 DEG C; and the temperature before every stage of methanation reaction is controlled at 250 DEG C through balancing control. Through a heat-insulating reactor and a waste-heat boiler heat exchange system, the method not only controls reaction temperature, but also produces steam serving as a byproduct at 3.8 MPa and 450 DEG C. Compared with other synthesis methods, waste heat energy produced during the methanation reaction is utilized more fully, so that the aims of saving energy, reducing emission and causing no environmental pollution are achieved while capacity is expanded.

The invention discloses a method for preparing liquefied natural gas by converting raw materials of coke oven gas and blast furnace gas. In the technology, the coke oven gas and the blast furnace gas are taken as the raw materials, the raw materials are subjected to normal-temperature normal-pressure dry desulfurization, gas compression, gas adsorption purification, gas isothermal-adiabatic serial methanation, gas adsorption drying and demetalization, freezing liquefication separation and other technical processes, and high-quality liquefied natural gas with the purity of over 99 percent is produced. By the technology, harmful impurities such as sulfur, naphthalene, tar, benzene, mercury and the like in the gas can be efficiently and easily removed fully at low cost, and components with low value, such as H2, CO, CO2 and the like are completely converted into required CH4 component with high value, so the method has the characteristics of low requirement on quality of feed gas, high yield of liquefied natural gas product, high product purity, low production energy consumption, no environmental pollution, reliable flow, low investment, simple operation and good economic benefit.

The invention discloses a thermal pyrolysis combination method and device and relates to a coal chemical industry technology. A fuel is pyrolyzed in a low-speed bed pyrolyzing furnace, the generated semicoke is discharged from the bottom of the pyrolyzing furnace, sent into a circulating fluid bed gasifier by virtue of a semicoke returning device so as to be subjected to gasification, and coal gas generated by the gasifier, carrying solid particles, enters in a cyclone separator; the gasification temperature of the gasifier is 900-1,200 DEG C, the fuel thermal pyrolysis temperature in the thermal pyrolyzing furnace is 50-200 DEG C lower than the temperature of the gasifier; pyrolysis gas generated in the pyrolyzing furnace is introduced into the upper part of the gasifier or introduced into the cyclone separator together with the coal gas generated in the gasifier; and the solid particles gathered by the cyclone separator are sent above the dense phase area of the pyrolyzing furnace by virtue of the returning device so as to provide heat for pyrolysis of the fuel. The method and device disclosed by the invention are used for pyrolysis and gasification of coal, biomass and other carbon-containing fuels, the generated coal gas has the advantages of high thermal value and low tar content, and the system is simple.

The invention provides a method for pulverized coal gasification for gas generation and direct reduction metallurgy of a gas-based shaft furnace. According to the method, feed coal is ground and then enters a gasification furnace in a form of pulverized coal; the pulverized coal reacts with a gasification agent oxygen and water vapor to generate crude gas rich in CO and H2; the high-temperature raw gas generated by the gasification furnace is subjected to cooling and wet cleaning for dust removal to obtain crude synthesis gas mainly containing CO and H2; the crude synthesis gas is adjusted into a reducing agent for a gas-based shaft furnace through water vapor conversion and purification; and the reducing agent enters the shaft furnace and reacts with lump ores or pellets to generate reducing iron. Through the invention, the coal gasification is combined with a gas-based direct reduction shaft furnace technology, thus the limitation on total natural gas of a gas-based direct reducing method is overcome, and large-scale production is realized; and the method has the advantages of low energy consumption, little pollution and the like.

A combined cycle system based on coal gasification and methanation gas-steam and a technique thereof, wherein, the method comprises the following steps: oxygen produced by an air separation unit and coal powder or water-coal-slurry are sent into coal gasification equipment, the produced crude gasification gas is sent to a carbon monoxide sulfur-tolerant shift reactor to adjust the ratio of hydrogen and carbon after the sensible heat recollecting, and is then sent into sulfur-tolerant methanation reactor to produce methane and carbon dioxide, then the reaction product is sent into desulfurization and decarbonization equipment so that element sulfur can be recovered and carbon dioxide can be separated so as to obtain substitute natural gas with high content of methane, part of which is sent to the gas-steam combined cycle equipment while the other part is sent to a urban gas system. The enriched CO2 density of the system can reach 50 to 60 percent, technical probability is provided for reasonably realizing low-energy-consumption reduced exhaust of CO2, no change needs to be done with gas turbines, each chemical unit operates according to established rated condition and needs not to change load owing to power conditioning so as to improve the economy of the operation of power plants; compared with the prior art, the energy utilization efficiency of the whole system is improved so as to realize the efficient clean utilization of coal.

A coal gasification process of coal bed deep underneath includes a gasification furnace in the coal bed, a gas let in canal linking one end of the furnace to ground, a gas let out canal linking the other end of the furnace to ground. Gas generated by coal burning in the furnace is collected. A drain system links a drain outlet over 10 meters below the furnace to the ground.

The invention relates to a process method for low temperature carbonization on a fluidized bed. The process method uses the principle of a lift pipe fluid catalytic cracker, uses a lift pipe reactor of the lift pipe fluid catalytic cracker as a carbonization reactor, uses a catalyst regenerator of the lift pipe fluid catalytic cracker as a high-temperature water gas generator, and uses high-temperature water gas as a fluidizing medium and a heat carrier of a carbonization raw material. The carbonization method comprises the following steps that: a carbonizing raw material is conveyed to the lift pipe fluidized bed reactor for a carbonization reaction of the raw material; the reacted oil and gas are separated to produce a carbonized product; carbonized carbocoal enters the water gas regenerator; carbon in the carbonized carbocoal, oxygen and water vapour in air are subjected to oxidation reaction and water gas reaction; the water gas obtained in the reaction is used as the fluidizing medium and the heat carrier during the carbonization process; and solid clinkers produced after the carbonized carbocoal is subjected to the water gas reaction are discharged. Compared with the prior art, the method has the advantages of simple process, high production capacity, less equipment and so on, and can be used in oil shale, oil sand, coal and other substances to produce liquid petroleum products.