284results about How to "Improve carbon conversion" patented technology

The invention discloses a method for coal gasification in a combined type fluidized bed, which comprises coal preparation, gas supply, gasification, slag discharge, dedusting, waste heat recovery and fine powder conveying. An ash agglomeration fluidized bed realizes gasification of large-particle coal; the non-completely converted carryover fine powder enters an entrained flow bed gasifier in a dense phase pneumatic conveying manner; secondary gasification is carried out by using a short retention time high temperature gasification manner; the produced ash slag is carried into an intersection segment of the fluidized bed and the entrained flow bed with high temperature coal gas, and rapidly mixed with ''low temperature'' large-particle partially carbonized coal in the fluidized bed and the produced ''low temperature'' coal gas; and partial ash slag is selectively discharged out of the gasifier in the form of solid. The method and the device of the invention have the advantage of being suitable for various coal types and high in carbon conversion rate.

A high-density pressurized fluid bed coal gasification device and a method relate to a gasification device and a method which are especially suitable for the efficient treatment of the high-sulfur, high-ash and high ash fusion point coal with high reserve volume in China and have the advantages of broad coal type adaptability, high carbon transformation ratio in the gasification process, high heat value of coal gas, low investment and excellent environment-friendly performance. A gasification reactor (1) is arranged in a pressure shell (2) and is divided into a dense-phase turbulent flow fluidizing section (9), a high-density core-annulus flow section (10) and a density rapid flow section (11) from bottom to top, and according to the gasification character of the goal with high sulfur, high ash and high ash fusion point, flow states with different features are adopted for pressurizing and sectionalized gasification from bottom to top and the pressure for gasification is 1.0-2.5MPa.

The invention relates to a fine coal gasification method with a fly ash compulsory recycling system, which is characterized in that coal gas produced by the fine coal gasification reaction carries fly ash particles; gas and fly ash particles in the coal gas carrying with the fly ash particles can be separated through a cyclone separator; and the separated fly ash particles enter the lower part of a gas distribution plate (8) of a gasifer to conduct further burning and gasification reaction. According to the method provided by the invention, a gas ejector (7) is mounted between a vertical tremie pipe of a fine coal fluidized bed coke powder circulating system and the gasifer, and the recovered fly ash particles pass the lower part of the gas distribution plate, and then directly enter a high-temperature oxidation zone in the center area of the gasifier by the gas ejector to conduct further burning and gasification reaction, so that the carbon conversion efficiency of the fine coal is improved, and the carbon conversion efficiency of wood coal and bituminous coal can achieve above 98 percent. Even though for the 'three high one low' poor coal, namely the coal with high sulfur, high ashy, high ash fusion temperature and low reactivity, the conversion rate of one way coal can also achieve above 92 percent.

A pulverized coal pressure dense transport bed gasification method and installation of the invention relates to gasification technology and employs in-furnace desulfurization craft. Pulverized coal and desulfurizer are sent into gasification furnace through the middle and lower part of gasification furnace by a feeder, and then react with a gasifying agent. Reaction mass flow upward from the bottom of the gasification furnace, and enter into a multistage gas-solid separator from an export on the top of the gasification furnace. Most solids are separated in the gas-solid separator and enter into the low part of the gasification furnace by a high flux return feeder to continue to participate in reaction. Gas products with a small amount of solid enter into a gas cooler which can recover gas manifested heat to generate steam. The enter modes of the gasifying agent are bottom once wind and cyclone twice wind, otherwise, the reactor can also be use to burn. Because of the high-rate cycle, high solid content and high gas-solid mixing in the gasification furnace of the invention, the gasification strength and gasification rate of the gasification furnace can be improved and higher gasification efficiency and carbon conversion rate can be obtained.

The invention relates to a two-stage gasification method and a gasification device for a fuel with wide size distribution. The two-stage gasification method for the fuel with wide size distribution comprises the steps of 1) adding the fuel to a fluidized bed pyrolyzer by a feeding device; adding a gasifying agent to the fluidized bed pyrolyzer; drying/pyrolyzing or partly gasifying the fuel under semicoking of the pyrolyzer and heating of the gasifying agent; and 2) sending the solid and gas generated in the step 1) to a fluidized bed gasification furnace, adding the gasifying agent to the fluidized bed gasification furnace, finishing complete gasification of semicoke; removing tar by high-temperature pyrolysis, part oxidization and semicoke catalytic reforming in the fluidized bed so as to produce clean gas. With the adoption of the method, the traditional fuel gasification process is divided into a material pyrolysis stage and a semicoke gasification stage, which are performed in an upper fluidized bed pyrolyzer and a lower fluidized bed gasification furnace.

Method of producing syngas in an IGCC system, comprising compressing and heating carbon dioxide-rich gas to produce heated compressed carbon dioxide-rich gas, mixing the heated compressed carbon dioxide-rich gas with oxygen and feedstock to form a feedstock mixture, subjecting the feedstock mixture to gasification to produce syngas, cooling the syngas in a radiant syngas cooler, contacting syngas cooled in the radiant syngas cooler with compressed carbon dioxide-rich gas to further cool the syngas, and removing an amount of carbon dioxide-rich gas from the product mixture and compressing the removed carbon dioxide-rich gas prior to mixing with oxygen and feedstock.

The invention provides a system and a method for gasification melting of household refuse and treatment of household refuse leachate. The system comprises a household refuse pretreatment system, a refuse energy recovering system and a refuse leachate concentration and flue gas treatment system, wherein the household refuse pretreatment system comprises a household refuse stock bin, a household refuse crusher, a household refuse sieving machine and a household refuse extrusion dehydrator which are sequentially connected; the refuse energy recovering system comprises a fluidized-bed gasifier, a cyclone melting furnace, a waste heat boiler and an air-supplying and oxygen-enriching system matched with the fluidized-bed gasifier, the cyclone melting furnace and the waste heat boiler; the refuse leachate concentration and flue gas treatment system comprises a leachate concentrating system, a flue gas purifying device and a wastewater treatment device. According to the system, the heat value of the refuge is increased by a pretreatment process; an oxygen-enriching gasifier and a high-temperature cyclone melting furnace technology are used as a recovering system of refuge energy; the refuge leachate is concentrated by using medium-temperature flue gas exhausted by the waste heat boiler; the concentrated leachate is sprayed into the high-temperature cyclone furnace for harmless treatment.

The invention relates to a two-stage oxygen supply dry slag removal pressurized gas flow bed gasification furnace, comprising a cylinder-shaped pressure-bearing case, a gasification chamber arranged in the cylinder-shaped pressure-bearing case, a synthesis gas cooling chamber, a mechanical slag crusher and a slag locking tank; wherein the gasification chamber and the synthesis gas cooling chamberare respectively arranged at the upper part and the lower part in the cylinder-shaped pressure-bearing case, the mechanical slag crusher is arranged below the bottom of the gasification furnace, and the slag locking tank is arranged below the mechanical slag crusher. The invention adopts two-stage oxygen supply temperature control technology and water vapour temperature control technology, and reasonable dry slag removal structure and necessary automatic control means are combined, solid slag removal of China 'double-high' coal large-scale pressurized gas flow bed gasification is realized, and the invention is especially applicable to 'double-high' coals with high ash content (25-27%) and high ash melting point (FT is more than 1400 DEG C), and handing capacity of single day can reach about 2000t/d.

A technique for producing coal natural gas by utilizing crushed coal slag through gasification includes that part of crude coal gas containing CH4 produced by crushed coal slag through gasification receives sulfur tolerant shift, the other part of crude coal gas is conveyed in a sub-line and converges with the gas after sulfur tolerant shift to be cooled, the cooled gas is purified to remove CO2,H2S, naphtha and H2O and other impurities to obtain synthesis gas meeting the methane synthesis H/C ratio, the synthesis gas performs methane synthesis under the effect of methane conversion catalyst, and the methane-synthesis natural gas (SNG) is transmitted in long-distance pipeline network after compression and drying. The invention has the advantages of high gasification rate, high gasification intensity, low consumption and low water content of coal gas.

The invention relates to a coal gas preparation facilities used carbon and ash containing compound as the material. It discloses entrained flow gasification furnace with solid state ash discharging and its industrial application. The gasification furnace is upright and has many nozzles. Its fireproof lining is conical surface. Its water spraying ring is set softening jam and two rows of holes. It can be applied to treat the coal with high ash fusing point, high ash content, and high sulfur and the big gasifier.

Method and apparatus for recycling fine ash particles for a multiphase chemical reactor (MCR), wherein coal is partially oxidized in the MCR to produce an exit gas stream in which fine ash particles are entrained, and wherein the MCR comprises a high temperature region with a temperature at or above a fusion temperature of the fine ash particles, wherein substantially all of the fine ash particles from the exit gas stream are returned to the high temperature region, to achieve improved carbon conversion and reduction in fly ash quantity.

This invention relates to a kind of clustered nozzle for gasification or combustion and its industrial applications. The clustered nozzle comprises a body case (5) and a plurality of nozzles (11) in the body case (5). The nozzle (11) includes an outer cannula (3) and an inner cannula (4) inside the outer cannula (3), a lower tubesheet (6), an upper tubesheet (7) and a cooling chamber (13). Compared with traditional coaxial double-pipe nozzles (e.g., dual-channel nozzles, triple-channel nozzles and multi-channel nozzles), the clustered nozzle for gasification or combustion has the following advantages: the length of combustion flame is shorter and the shape of flame is approximately rectangular, which help to protect the lower firebricks of the gasifier, thus prolonging their working life; the distribution of the residence time is narrower, which helps to increase the conversion rate of carbon; and the nozzle is properly-structured, which helps to prolong its working life.

The invention provides a gasification device for solid fuel, which comprises a gasification chamber and a cooling purification chamber. A first cooling medium distributor (5) is arranged at an inlet of the cooling purification chamber, and is used for injecting a low-temperature cooling medium into high-temperature synthetic gas from the gasification chamber along the circumferential direction, thereby making the high-temperature synthetic gas cooled and removing solid impurities from the high-temperature synthetic gas. The invention also provides a method for producing synthetic gas, which comprises the steps: ensuring that the quick incomplete reaction of the solid fuel and an oxidizing agent is performed to generate the high-temperature synthetic gas; and injecting the low-temperature cooling medium into the high-temperature synthetic gas along the circumferential direction to purify the high-temperature synthetic gas and make the temperature of the high-temperature synthetic gas reduced. The device and the method improve the purity of the synthetic gas which is finally obtained by temperature reduction, impurity removal and heat recovery for multiple times; and the device has high carbon conversion rate, and also has good complementary energy and waste heat recovery effect, low water consumption and no pollution.

A method of and an apparatus for gasifying carbonaceous material, the apparatus including a gasification reactor, to which oxygen-containing primary gas and secondary gasification gas are introduced, whereby a portion of the material to be gasified is gasified to product gas, residual carbon contained in the fly ash extracted from the product gas is combusted in a cyclone combustor, and the exhaust gas from the cyclone combustor is guided to above the bottom level of the gasification reactor to act as secondary gasification gas.

The present invention discloses a multi-nozzle multi-stage oxygen supplying entrained-flow gasifier. The entrained-flow gasifier comprises a top closed type gasifier body, an ignition nozzle chamber, a gasifier outlet, and at least two process nozzle chambers, wherein process nozzles are arranged inside the process nozzle chambers. The entrained-flow gasifier further comprises at least two secondary oxygen supplying nozzle chambers, wherein secondary oxygen supplying nozzles are arranged inside the secondary oxygen supplying nozzle chambers, the secondary oxygen supplying nozzle chambers are arranged between the process nozzle chambers and the gasifier outlet, and are symmetrically arranged on the circumference of the gasifier body, and the secondary oxygen supplying nozzles are arranged inside the secondary oxygen supplying nozzle chambers. The present invention further discloses a gasification method of the gasifier. According to the gasification method, an oxidizing agent is introduced to the secondary oxygen supplying nozzle during the reaction process to promote the further gasification reaction. With the present invention, a plurality of the nozzles are adopted to carry out multi-stage oxygen supplying on the gasifier, such that the service life of the fire brick structure on the upper space of the gasifier is substantially prolonged so as to substantially improve the operating rate and the performance of the gasifier. In addition, with the present invention, the liquid slag tapping of the gasifier is ensured, and the phenomenon of slag blocking of the outlet is avoided.

The invention discloses a step-by-step gasification method of pulverized coal with double beds in series, which adopts the form of circulating fluidized bed gasification furnace in series with entrained flow bed gasification furnace. The core of the invention is to use oxygen in the entrained bed to perform secondary gasification on the high-temperature dust-containing gas produced by the gasification of the circulating fluidized bed. The present invention takes circulating fluidized bed gasification as the main body, and coal gasification is mainly completed in the circulating fluidized bed. By virtue of the advantages of circulating fluidized bed gasification, the coal type adaptability of the gasification device is expanded, and the single set of gasification device is improved. production capacity. Supplemented by entrained bed gasification, with the help of its high reaction temperature and the characteristics of crude gas needing to be washed by chilled water, it solves the problems of low carbon conversion rate, low content of effective gas in syngas and coarse gas produced in circulating fluidized bed gasification. There are a series of problems such as high ash content and pyrolysis products.

A gasification nozzle, which comprises a central oxygen nozzle, a coal-water slurry nozzle and an epoxy nozzle that are concentrically arranged from the inside to the outside, wherein the end section of the central oxygen nozzle is relative to the inner diameter of the end section of the coal-water slurry nozzle. The shrinkage is 20mm-100mm; the inclination angle of the epoxy nozzle is 20°-50°; the inclination angle of the outer side of the coal-water slurry nozzle is 30°-70°, and the inclination angle of the inner side is 30°-80°; the center The outside inclination angle of the oxygen nozzle is 30°-70°; a first locator is arranged in the epoxy channel, and a second locator is arranged in the coal-water slurry channel, and the top of the first locator is in the shape of a swirl sheet, so The included angle between the top and the feeding direction of oxygen is 20°-60°. When the gasification nozzle of the invention is used for gasification, the gasification effect of the coal-water slurry is better, the maximum production load of the gasification nozzle is increased, and the service life of the gasification nozzle is longer.

The invention relates to a coal pyrolysis and gasification coproduction method. The method comprises the following steps: 1, separating coarse coal dusts and fine coal dusts from raw coal; 2, pyrolyzing the coarse coal dusts in a fluidized bed mode to obtain coal tar and semicoke; 3, gasifying the semicoke generated after pyrolysis in a fluidized bed mode to obtain a gas flow and high temperature semicoke, separating a product gas and solid particles from the gas flow, and returning at least parts of the high temperature semicoke and/or at least parts of the product gas to the above pyrolysis process in order to be used as a heat source in the pyrolysis process; and 4, carrying out coal dust gasification on the fine coal dusts separated in step 1 and the solid particles separated in step 3. The coal pyrolysis and gasification coproduction method realizes combined supply of heat, gas, oil and a chemical substance, and also realizes a high carbon conversion rate.