1024 results about "Coal chemical industry" patented technology

The invention relates to method and device for gasifying a multi-segment staged converted fluidized bed. The method comprises the following steps of: supplying coal; supplying gas; gasifying; slagging; and conveying fine powder. The device for gasifying the multi-grade staged converted fluidized bed comprises an agglomerating ash separating unit, a pyrolyzing and gasifying reactor of the multi-segment staged fluidized bed and a semicoke fine powder cyclic feeding unit. The invention has the advantages of high volume utilization rate of a gasifying oven, great handling capacity and high utilization rate of total carbon, is suitable for a coal staging and converting system and can be singly used for producing gas for mass coal-based methane synthesis and coal chemical industry.

The invention discloses a hydrocracking treatment technique for coal tar total distillate, which comprises: first mixing with homogeneous catalyst, or adding impurity, gum, asphaltene and coal oil total distillate contained much oxygen element directly into suspended-bed hydrogenation device; cutting the stream with distilling plant to discharge water, distillate less than 370Deg that enters fixed bed reactor for hydrorefining reaction to cut gasolene less than 150Deg and diesel oil 150-370Deg, and tail oil less than 370Deg that recycles to said reactor and converts into light oil product. Compared with prior art, this invention is simple, but high conversion rate and stability.

The invention relates to the field of coal chemical industry, and more specifically relates to a method of extracting phenolic compounds from coal liquefied oil or coal tar. The method comprises the following steps: 1) distilling coal liquefied oil or coal tar and cutting to obtain fractions at a temperature of 260 DEG C; 2) mixing an extractant with the obtained fractions and layering the extractant; 3) separating and collecting the extractant layer which contains phenolic compounds; 4) carrying out multistage back extraction on the phenolic compounds so as to obtain a stripping agent-phenol solution and an extractant; 5) separating the stripping agent-phenol solution by rectification, recovering the stripping agent for cyclic utilization, and carrying out separation to obtain crude phenols; 6) removing entrained neutral oil in phenolic compounds by water vapour so as to obtain crude phenol products. The method of extracting phenolic compounds from coal liquefied oil or coal tar provided in the invention avoids the usage of soda acid, exerts no influence on subsequent treating processes, and guarantees high recovery rate and purity of phenols.

The invention relates to an ammonia process flue gas treatment method for acidic tail gas. The method includes the steps of: 1) controlling the sulfur dioxide concentration of tail gas entering an absorption tower at a level of less than or equal to 30000mg/Nm<3>; 2) arranging process water in an absorption tower entrance flue or in the absorption tower or cooperating with a ammonium sulphate solution to perform spray cooling; 3) disposing an oxidation section in the absorption tower, setting an oxidation distributor at the oxidation section to achieve oxidation of a desulfurized absorption liquid; 4) arranging an absorption section in the absorption tower, utilizing an absorption liquid distributor in the absorption section to realize desulfurization spray absorption by an ammonia-containing absorption liquid, which is fed through an ammonia storage groove; 5) arranging a water washing layer at an absorption section upper part in the absorption tower, washing the absorption liquid in the tail gas by the water washing layer and reducing the absorption liquid escape; and 6) setting a demister at the upper part of the water washing layer in the absorption tower to control the mist drop content in the purified tail gas. Employment of the Claus sulfur recovery and ammonia process desulfurization integrated desulfurization technology in the coal chemical industry can reduce the investment cost of after-treatment, the process can be simpler, and factory environmental protection treatment can form an intensive advantage.

The invention relates to warm mixed asphalt cement and a preparation method thereof. 100 percent of warm mixed asphalt cement comprises the following components in percentage by weight: 90.0-97.0 percent of asphalt cement, 2.0-8.0- percent of rheological modification agent and 0.5-5.0 percent of macromolecular polymer, wherein the rheological modification agent is formed by combining the following substances: (a) byproducts produced in a petroleum refining process, wherein the weight content of aromatics is 50-80 percent, and the kinematic viscosity at 100 DEG C is 20 mm<2>/s to 70 mm<2>/s; and (b) derivatives produced in petrochemical industry, coal chemical industry and forestry chemical industry; through the warm mixed asphalt cement, the high-temperature rutting resistance, low-temperature tensile strength and resistance to brittle fracture of the asphalt cement are improved while energy conservation and environmental protection are realized; the asphalt cement is mainly applied to construction and maintenance of various grades of highways and municipal roads, and is particularly suitable for cities, parks and tunnels with higher environmental protection requirements.

The invention discloses a method for producing sulfuric acid by using waste gas containing hydrogen sulfide, and the method comprises the steps of firstly burning the waste gas containing H2S at the temperature of 600-1300 DEG C for generating high-temperature gas containing SO2; cooling the high-temperature gas containing SO2 to 400-500 DEG C, entering into a converter, oxidizing SO2 to SO3 under the action of a catalyst in the converter, generating SO3 gas and cooling to 250-350 DEG C, further entering a condenser for condensing SO3 and water vapor to H2SO4 and emitting exhaust gas. The method can not only solve the waste gas treatment problem of chemical fertilizers, petrochemical industry, natural gas, coal chemical industry, coking, chemical fibers and other industries, but also change wastes into treasures and utilize the waste gas containing the hydrogen sulfide to produce the sulfuric acid and the steam of 2.5-6MPa under the situation of not consuming other chemical products; and the method has no emissions of waste acid and waste water, and the emitted exhaust gas achieves the national emission standard, thereby being the real green energy method of changing the wastes into the treasures.

The invention discloses a method for extracting and dephenolizing coal chemical industry wastewater. Two different solvents are used as extracting agents, and serially-connected double-tower two-stage extracting dephenolization is adopted. The method comprises the following steps of: after carrying out gravity settling oil removal pretreatment on high-concentration phenol-contained wastewater produced in the coal chemical industry process and deacidifying, deaminizing and removing mechanical impurities, carrying out first-stage extracting dephenolization with the first solvent as the extracting agent; and carrying out second-stage extracting dephenolization with the second solvent as the extracting agent and conveying dephenolized water into a biochemical treatment working section. The wastewater subjected to first-stage dephenolization has the total phenol content of 400-1,000mg/l and the COD (Chemical Oxygen Demand) of 2,000-5,000mg/l; the wastewater subjected to second-stage dephenolization has the total phenol content of smaller than 300mg/l and the COD of smaller than 2,000mg/l; and the total phenol removal rate is larger than 90 percent, and the polyphenol removal rate is larger than 70 percent. The invention can meet the requirement of water quality of biochemical treatment, has the advantages of high phenol removal rate, less solvent dosage and low energy consumption and is particularly suitable for treating the wastewater which has high polyphenol content and is produced in the coal gasification, coking and chemical industry synthesis process.

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 treatment method for recycling complex waste water in the coal chemical industry and relates to recycling technologies for enhanced pretreatment, biochemical treatment, deep purification and regeneration process of waste water. The invention provides the process scheme as follows: first enhanced pretreatment for the complex waste water in the coal chemical industry is carried out by using the combined process of air floatation, Fenton oxidation and ferric-carbon micro-electrolysis, so as to improve the biodegradability of the waste water; then the waste water is poured into a biochemical system comprising a hydrolyze acidification zone pool, an anoxic pool and an aerobic pool; the biodegraded water is discharged into a deep purification system with the function ofozone-biological activated carbon filtration, so that materials which are difficult to degrade are further removed, and the discharged water can be used for green spaces and other landscapes; after that, most of salt ions are removed by using a regeneration recycling system with the functions of multi-media filtration, ultrafiltration and reverse osmosis, so as to obtain water can be reused for production.

The invention discloses a coal-tar oil multistage hydrogenation craft, which belongs to coal chemical industry technology area. The method of the invention is that coal-tar oil fraction oils like impurities, sols, high content, asphaltenes, oxygen element, and so on, with high content or entire fraction are delivered into pre-hydrogenation reaction chamber by pump and are carried on pre-hydrogenation processing, then are successively followed by hydrogenation and demetallization, and depth hydrogenation reaction. After carried on separation of water and lightweight components, the generative fluid enters into a hydrocracking reactor, passes by a distiller to get gasoline fractions, diesel oil and hydrocracking tail oil out. Compared with the prior art, the invention can guarantee the long-period stability operation of the installation.

The invention relates to the field of industrial wastewater treatment processes and provides a multi-stage countercurrent electrodialyzer reversal-based method for treating saline wastewater in the coal chemical industry. The method comprises the following steps: 1) carrying out catalytic ozonation treatment on the saline wastewater in the coal chemical industry; 2) carrying out multi-media filtration and membrane filtration treatment on the wastewater subjected to catalytic ozonation in the step 1) in sequence; and 3) treating the effluent obtained after membrane filtration in the step 2) with a multi-stage countercurrent electrodialyzer reversal, thus achieving deep treatment, desalting and recycling of the saline wastewater in the coal chemical industry, wherein the multi-stage countercurrent electrodialyzer reversal comprises an electrodialysis membrane stack unit, a frequency reversal control unit and an online monitoring and process control unit. The method has the advantages of high fresh water recovery rate, low concentrated water discharge, low operating cost, stability in system operation and the like and can avoid the problems of low fresh water recovery rate, low concentration multiple, high treatment cost, serious membrane pollution, instability in system operation and the like in the routine techniques.

The invention provides a coal chemical industry high-concentration wastewater treatment method and an apparatus which can solve the problems of low flux and high membrane pollution when an MBR (membrane bioreactor) is used for coal chemical industry wastewater treatment in the prior art. The coal chemical industry high-concentration wastewater treatment apparatus comprises an oil separation device, a flocculation reaction device communicated with the oil separation device, an ultra-micro air flotation device communicated with the flocculation reaction device, an advanced oxidation device communicated with the ultra-micro air flotation device, a hydrolysis and acidification device communicated with the advanced oxidation device, a denitrification device communicated with the hydrolysis and acidification device, an anoxic device communicated with the denitrification device, and an aerobic MBR device which comprises a plurality of MBR membranes arranged in the aerobic MBR device and is communicated with the anoxic device. The coal chemical industry high-concentration wastewater treatment method and the device provided by the invention have the beneficial effects that the pretreatment is complete, the subsequent treatment difficulty is low, and the biochemical treatment effect is ensured so as to be favorable for reducing membrane pollution; in addition, the cleaning frequency of the membranes is low and the service life is long; and furthermore, the MBR outlet water is stable, suspended matters are avoided, and the deep treatment effect can be further ensured.

The invention relates to an advanced treatment process and device of coal chemical industry wastewater. The process comprises the following steps: removing oil, performing deacidification and deamination, performing centrifugal extraction and dephenolization, performing catalytic wet oxidation and performing biochemical treatment. The device comprises an oil removal pool, a deacidification and deamination regulating reservoir, an ammonia still, a high speed centrifuge, a catalytic wet oxidation regulating reservoir, a catalytic wet oxidation tower, a biochemical regulating reservoir and an A/O biochemical system which are connected with one another sequentially. The indirect emission standard requirements in the national coking chemical industrial pollutant discharge standard (GB16171-2012) can be met after main pollutants such as chemical oxygen demand (COD), oil, ammonia nitrogen and phenol in coal chemical industry wastewater are treated, and ammonia water and crude phenol can be recovered. Compared with the prior art, the advanced treatment process of coal chemical industry wastewater has the beneficial effects that sewage produced in coal chemical industry is treated with a clear target on the basis of characteristics of the coal chemical industry production process, so that the indirect emission standard requirements are met, available resources in the sewage are recovered, and sewage resource treatment is really realized.

The invention relates to a method for preparing industrial salt with coal chemical strong brine, particularly to a method for preparing the industrial salt through separation, evaporation and crystallization of the coal chemical strong brine, and aims to solve the problems that secondary pollution exists and resources are not recycled in existing coal chemical strong brine treatment processes. The method comprises the steps as follows: 1, adding lime milk, a coagulant and a magnesium agent into the coal chemical strong brine, and feeding the coal chemical strong brine into a clarifying tank or a coagulative precipitation tank for chemical precipitation treatment; 2, adjusting the pH; 3, performing ultra-filtration treatment; 4, performing nano-filtration treatment; 5, performing single-effect evaporating crystallization or quadruple-effect evaporating crystallization to obtain the industrial salt. The method is used for treating the coal chemical strong brine and preparing the industrial salt from the coal chemical strong brine.

The invention discloses a method for coal hydrogenation pyrolysis and gasification coupling, comprising the steps of: drying and preheating raw material coal with granularity less than or equal to 2mm in a coal drying and preheating system; putting 60-80% of the dried and preheated raw material coal in a coal hydrogenation pyrolysis furnace to carry out coal hydrogenation pyrolysis; putting a pyrolyzed gas-phase product in a pyrolyzed gas purification and separation system to carry out separation; putting all the semicoke generated by the coal hydrogenation pyrolysis furnace in a coke hydrogenation gasification furnace to carry out hydrogenation gasification; putting a gasified gas-phase product in a gasified gas purification and separation system; and causing 20-40% of the dried and preheated raw material coal and high-temperature coke granules from the coke hydrogenation gasification furnace to enter a hydrogen-rich generator from upper and lower paths under the combined action of oxygen and a water vapor mixed gasification agent so as to carry out gasification reaction. The coal hydrogenation pyrolysis, semicoke hydrogenation gasification and coke granule hydrogen production are combined; therefore, the tar yield and the light component content are effectively improved and methane-rich pyrolyzed gas, gasified gas and coal chemical products such as naphthalene, benzene, phenol and the like with high added value can be obtained.

The invention belongs to the technical field of coal chemical industry and particularly relates to a process for coproducing gasified synthetic ammonia and liquefied natural gas (LNG). The invention provides a method and equipment for coproducing the LNG and the synthetic ammonia by using raw coal gas generated by a high-temperature entrained bed; the desulphurization and the decarbonization are carried out by using a mature and advanced physical and chemical absorption process, methane is obtained by using an advanced methanation conversion technology, then, a deep cooling technology is adopted to produce liquid methane and hydrogen through staged cooling and washing separation, the produced liquid methane is outputted as a product, i.e. the LNG, meanwhile, the produced hydrogen is mixed with nitrogen to form a synthetic gas, and the synthetic gas is conveyed to an ammonia synthesizer for the production of the synthetic ammonia after the cold energy is recovered. The coproduction of natural gas and liquid ammonia is achieved, the equipment has corresponding capability for load adjustment, and the emission of vent gas in synthesis is not needed, so that the raw coal gas is maximally used in the production of products.

The invention relates to a deep processing method of wastewater in the coal chemistry industry. The method comprises the following steps in sequence: subjecting the effluent, which has been processed by a secondary biochemical treatment for wastewater in coal chemistry industry, to a chemical oxidation treatment and a biological oxidation treatment in sequence. The processing method adopts a technology integrating the chemical oxidation and biochemical oxidation, thus overcomes the shortage of high operation cost of the chemical oxidation technology and the shortage of low COD elimination rate of the biochemical oxidation technology, and achieves the degradation of partial organic pollutants in wastewater. The processed wastewater reaches the discharge or recycle standard, and the pollution to the environment is reduced. The processing method has the advantages of high processing efficiency, low operation cost, and strong adaptability for wastewater in coal chemistry industry, the processed wastewater reaches the national environmental requirements, and thus the processing method can achieve good economic and social profits.

The invention discloses an automatic catalyst-feeding method in order to solve the problem that the feeding amount of the prior small feeder with a weighing function is small in the process of batch-by-batch feeding. In the process of operation, flow-conveying air is constantly charged into a feeder (1), and the pressure P4 of the feeder (1) is constantly lower than or equal to the pressurizing pressure P1 of a catalyst storage tank (71) and higher than the pressure P5 of a regenerator (72). The method mainly includes the following steps: (A) feeding speed regulation, (B) regulative discharge, (C) feeding, and (D) feeding standardization. The method is mainly used in the fluid catalytic cracking technique of the petrochemical industry and the methanol-to-olefins reaction technique of the coal chemical industry, and uses the small feeder (1) with a weighing function to continuously feed a great deal of catalyst in the catalyst storage tank (71) into the regenerator (72).

The invention relates to an electrodialysis device applicable to treatment on high-salinity wastewater from industries such as coal chemical industry. The electrodialysis device comprises an electrodialysis membrane stack unit, a frequent polarity conversion control unit and an online monitoring and process control unit, wherein the electrodialysis membrane stack unit consists of a plurality of membrane stacks which are connected with one another in series through pipelines in a desalted department, a concentrated department and a pole compartment respectively and form a multi-level inversion system with solution flow direction control; a programmable logic controller (PLC) unit, a rectifier and a solenoid valve are used for implementing frequent polarity conversion; and solutions in the desalted department and the concentrated department can be cycled or partially cycled, thereby obtaining a high fresh water recovery rate and a high concentrated water concentration multiple. The electrodialysis device can fundamentally solve the problems of low fresh water recovery rate, low concentrated water concentration multiple, high energy consumption and difficulty in long-term and stable operation in the process of treating the high-salinity wastewater in the coal chemical industry and the like by an ultrafiltration-reverse osmosis method, and thus the engineering application of the electrodialysis treatment technology for the high-salinity wastewater in the industries such as the coal chemical industry is promoted.

The invention discloses a recovery processing method of high salinity wastewater containing sodium chloride and sodium sulfate, and belongs to the field of industrial wastewater treatment. According to the recovery processing method, sodium chloride and sodium sulfate are recycled via primary evaporative crystallization, removing of sulfate ions via adding of materials and generation of precipitations, and secondary evaporative crystallization. The recovery processing method can be used for effective recovery of sodium chloride and sodium sulfate in coal chemical industry high salinity wastewater; process conditions are simple and stable; the recovery processing method is convenient for industrialized popularization; recovered sodium chloride and sodium sulfate are capable of satisfying quality requirements of industrial-grade products, and can be recycled and reused directly or be sold as by-products; processing of high salinity wastewater is realized; environmental requirements are satisfied; waste is changed into valuables; salt resource utilization is realized; and factory income is increased.

The invention discloses a catalyst for producing light olefins through methanol and preparation method thereof which belongs to the field of coal chemical industry. The current catalyst for producing light olefins through methanol needs to be frequently regenerated under a reaction temperature, and has the disadvantages of short service life, high cost of manufacture and complex preparation process. The catalyst proposed in the invention consists of 95-99.99 wt percent of carrier and 0.01-5wt percent of active components. The invention adopts a vacuum impregnation method to load metal components and solid acid onto the carrier, dry and calcine to obtain the catalyst for producing light olefins through methanol. The invention has the advantages of high catalytic activity, high selection onlight olefins, gentle reaction conditions, low coking, long service life, simple preparation process, being suitable for forming carrier beneficial to industrialization, and low cost, etc.

The invention discloses a method for separating a salt from coal-chemical-industry wastewater through an electroosmosis technique. The method for separating the salt from the coal-chemical-industry wastewater through the electroosmosis technique is characterized by comprising the following steps of firstly, carrying out pretreatment on raw water of the coal-chemical-industry wastewater, then introducing the wastewater subjected to the pretreatment into primary electroosmosis, so as to realize the separation between the salt and a COD (Chemical Oxygen Demand), afterwards, introducing thick water subjected to the primary electroosmosis into secondary electroosmosis to carry out concentration, and separating out sodium sulfate and sodium chloride from an obtained concentrated solution through post-treatment, thereby completing treatment. According to the method provided by the invention, by applying the characteristic that the salt can be separated and concentrated through electroosmosis, the COD and the salt in the coal-chemical-industry wastewater which is subjected to the pretreatment are separated; afterwards, the separated salt is concentrated; the difficult problems of the separation and the recovery of the salt in the coal-chemical-industry wastewater are solved; the sufficient utilization of a solid salt resource is realized; further, a whole technical process is free from the emission of pollutants and is green and environmentally-friendly; the zero emission, in a real sense, of the coal-chemical-industry wastewater can be realized.

A flue gas-treating method for treating acid tail gas by using an ammonia process, comprising the following steps of: 1) controlling the concentration of sulfur dioxide in an acid tail gas entering an absorber to be ≦30,000 mg/Nm³; 2) spraying and cooling with a process water or/and an ammonium sulfate solution in the inlet duct of the absorber or inside the absorber; 3) providing an oxidation section in the absorber, wherein the oxidation section is provided with oxidation distributors for oxidizing the desulfurization absorption solution; 4) providing an absorption section in the absorber wherein the absorption section achieves desulfurization spray absorption by using absorption solution distributors via an absorption solution containing ammonia; the absorption solution containing ammonia is supplied by an ammonia storage tank; 5) providing a water washing layer above the absorption section in the absorber, wherein the water washing layer washes the absorption solution in the tail gas to reduce the slip of the absorption solution; 6) providing a demister above the water washing layer inside the absorber to control the concentration of mist droplets contained in the cleaned tail gas. In the coal chemical industry, the integration of the Claus sulfur recovery process and the ammonia desulfurization technology can reduce the investment of the post-treatment and simplify the operation process, and provide intensive advantages to the environmental control of plants.

Belonging to the technical field of coal chemical industry and energy sources, the invention discloses a method for preparing clean fuel oil from coal tar. The method is characterized by: distilling coal tar to split into light oil and tower bottom heavy oil, subjecting the tower bottom heavy oil to delayed coking, then mixing it with coal tar and conducting distillation again, subjecting the light oil to high-pressure hydrogenation and catalytic distillation cracking to split it into distillate oil less than 180DEG C, distillate oil greater than 180DEG C and less than 360DEG C, and distillate oil greater than 360DEG C, letting the distillate oil less than 180DEG C directly enter a low-pressure gasoline hydrogenation reactor to undergo hydrofining so as to obtain high-quality gasoline, letting the distillate oil greater than 180DEG C and less than 360DEG C directly enter a low-pressure diesel oil hydrogenation reactor to undergo hydrofining to obtain high-quality diesel oil, mixing the distillate oil greater than 360DEG C with light oil and letting the mixture directly enter a high-pressure hydrogenation reactor to undergo reaction again. The catalytic distillation catalyst and the sulfide catalyst used in the invention select appropriate carriers and active components according to the composition and properties of coal tar. The method provided in the invention has a simple process, lowers equipment investment cost, employs catalysts with high activity and selectivity, has high yields of gasoline and diesel oil, provides a new approach for utilization of coal tar, and has good economic benefits and industrial application prospects.

The invention discloses a method for treating total nitrogen in coal chemical wastewater by using microbes. The method is characterized in that the wastewater sequentially passes through a first aerobic tank, a first sedimentation tank, a facultative tank, a second aerobic tank and a second sedimentation tank to be subjected to two-stage biochemical treatment; microorganisms and microbial carriers are added into the first aerobic tank, the facultative tank and the second aerobic tank; before entering into the first aerobic tank, the wastewater passes through an Anammox tank, anammox bacterias and carrier activated carbon are added into the Anammox tank, and an aeration device and a mixing device are also arranged in the Anammox tank. The method disclosed by the invention is concise in technological process, and an Anammox tank is adopted in the first stage of the method, and different operation modes can be adopted according to different water qualities, so that the Anammox tank is adapted to fed water with different natures, thereby reducing the construction cost, improving the treatment capacity, and achieving an effect of energy conservation and consumption reduction. Because the total nitrogen is removed through two-stage A/O (hydrolytic acidification/oxic treatment) and anaerobic ammonia oxidation, the total nitrogen removal effect is obviously better than that achieved in the existing A/O process.

Belonging to the field of coal chemical industry, the invention provides a method for reprocessing and utilization of Fischer-Tropsch synthetic naphtha mainly directed at the circumstances of high olefin content and low octane number in Fischer-Tropsch synthetic naphtha. The method includes: firstly, conducting fractionation on deacidified and dehydrated Fischer-Tropsch synthetic naphtha; letting the fractionated heavy fraction enter a low temperature reactor to undergo low temperature aromatization reaction, and isolating rich gas and gasoline blend components from the reaction product; and mixing the fractionated light fraction with part of the rich gas separated from a gas-liquid separator, and letting the mixture enter a high temperature reactor to undergo high temperature aromatization reaction so as to generate aromatic hydrocarbon, with the catalyst adopted by the high temperature aromatization reaction being a spent catalyst left by low temperature aromatization reaction. With the method provided by the invention, the spent catalyst left by low temperature aromatization reaction and the high olefin content light fraction with heat release characteristics can be effectively utilized to carry out high temperature aromatization reaction again to generate mixed aromatic hydrocarbon. While enhancing the liquid yield, the method fully improves the utilization efficiency of the catalyst and greatly reduces the energy consumption of equipment, thus having significant economic benefits.

The invention relates to a method for producing tar and hydrocarbon fuel products from coal. The method comprises steps of pyrolysis, raw gas purification and desulfurization, a methanation process, a methane separation process, a gasification process, a conversion process, a purification process, a sulfur recovery process, a fine desulfurization process, a synthesis process and the like. With the adoption of the method, raw coal is firstly subjected to low-temperature pyrolysis and then subjected to gasification conversion, the types of coal chemical products are increased, and the utilization efficiency of the coal raw material is improved; the problem that low-rank coal cannot be gasified and utilized by a wet-process entrained-flow bed is solved, the raw material consumption during gasification is reduced, the waste water discharge is reduced, the greenhouse gas production amount in the process is reduced, and efficient class-based and quality-based utilization of the coal resource is realized.

The invention discloses a coal chemical industry wastewater zero emission treatment method and a system. The system has an active coke absorption system, a multi-stage film separation system, a concentrated water recycling system and a water circulation system. Coal chemical industry wastewater after pretreatment and biochemical treatment are successively subjected to flocculation precipitation, absorption and filtering by active coke and multi-stage film separation; fresh water obtained after the multi-stage film separation reaches the circulating water use requirement of plants; and concentrated water obtained after the multi-stage film separation is added with CaCO3 or CaO to prepare into desulfurized slurry to serve as a desulfurizer in a coal-fired boiler flue gas desulfurization system or be directly used as humidifying water for flue gas desulfurization via a recirculating fluidized bed semidry method. The invention can realize wastewater recycling and zero emission, thus protecting environment and saving water resources.

The invention relates to the technical field of coal chemical industry, in particular to a dry distillation device for coal with wide particle size distribution and a method. The dry distillation device for coal with wide particle size distribution, provided by the invention, comprises a semi-coke outlet (1), a combustion heating chamber (3), a coal feed port (5) and a pyrolysis gas discharge pipe (4); two layers of partition plates are also arranged in the dry distillation device; a pyrolysis gas channel (2) is formed between the two layers of partition plates; and pores are formed in the partition plates to form a gas flow path from a fuel bed to the pyrolysis gas channel (2). In the dry distillation device for coal, provided by the invention, an inner component with good heat transfer performance and made from high-temperature resistant material also can be arranged therein, thus the heat transfer of a heating wall on the fuel bed and in the fuel bed is enhanced. In the invention, the pyrolysis gas channel is added into the dry distillation reaction device, so that the gas-phase product generated in the coal dry distillation process can overflow in time; and due to the inner component, the heat transfer and mass transfer effects are improved, the secondary reaction is reduced, and the tar yield and quality are further improved.

The invention belongs to the coal chemical industry field of coal water slurry gasification, and specifically discloses a combustion nozzle combination device of a multi-channel coal water slurry gasification furnace. The combustion nozzle combination device comprises a high-voltage electric igniter connected with an electric ignition rod, wherein the high-voltage electric igniter is connected to an ignition nozzle through an ignition gas channel and an ignition gas pipe; a central oxygen channel is connected to a central oxygen pipe and nozzle, and is wrapped outside the ignition gas channel, the ignition gas pipe and the ignition nozzle; a coal water slurry channel is connected to a coal water slurry pipe and nozzle, and is wrapped outside the central oxygen pipe and nozzle; an outer annular oxygen channel is connected to an outer annular oxygen pipe and a combustion nozzle, and is wrapped outside the coal water slurry pipe; and a preheated gas channel is connected to a preheated gas pipe and nozzle, and is wrapped outside the outer annular oxygen pipe. By adding the ignition gas channel, the preheated gas channel, the electric ignition rod and a high-voltage power supply for the electric ignition rod based on the existing device, the invention simplifies the technical process, realizes the continuous operation of the combustion nozzle in accordance with a process of igniting, preheating and combusting coal water slurry, saves the production cost, and improves the operation safety and reliability.