108results about How to "Reduce coal blending costs" patented technology

The invention provides a coking raw material applicability classification, comprehensive quality evaluation and coal blending guiding method. According to the method, specific indexes of coking raw materials and the mass index of solid products obtained from coking of the coking raw materials are integrated into three single indexes including caking capacity, coking capacity and a thermal property index according to the corresponding relations with coke quality indexes, and applicability classification is performed on the coking raw materials; the three single indexes are then integrated with ash content and sulfur content value indexes into an comprehensive capacity index, and six price-performance ratio indexes are formed through correlation between the three single indexes, the one comprehensive capacity index, the ash content and sulfur content value indexes and the price; after the applicability classification, coking coal blending is performed according to the three single indexes of the coking raw materials, the one comprehensive capacity index and the ash content and sulfur content value indexes, the six indexes for coal blending are controlled to be within plus/minus e%*a reference scheme score (e ranges from 5 to 10), the price-performance ratio of the six indexes for coal blending is calculated, an optimal coal blending scheme is determined, and refined and optimized coal blending is realized.

The invention relates to a method for predicting the mechanical strength and thermal properties of coke. In the method, vitrinite reflectance distribution of coal is used as a main input parameter to predict the mechanical strength and thermal property indexes of the coke. The prediction of the mechanism strength index of the coke is realized by a BP neural network, and the prediction of the thermal property index is realized by the BP neural network or a calculation method. The method can ensure the effective use of coke coal resources, scientifically and accurately predict the cold strengthand thermal property of the coke, guarantee the quality of the coke, reduce coal blending cost, realize scientific coal blending and implement a coal blending expert system.

The invention discloses a method for performing nonlinear prediction on coke quality on the basis of cohesiveness and coal-rock indexes of single coal, which provides important technical guarantee for improving the stability and quality of coke produced by coke making enterprises. The method comprises the following steps of: establishing an information database storing qualities and coke quality indexes of the single coal for coking, and inputting the cohesiveness indexes and the coal-rock indexes of the single coal for coking into the coal information database; establishing a coal quality prediction model, and predicting quality indexes of matched coal by virtue of a clustering and support vector machine; defining the quality indexes of the matched coal, and predicting quality indexes of the coke according to the quality indexes of the single coal; and establishing a model for predicting the crushing strength and abrasive resistance of the coke. The invention further provides a coke quality prediction system with optimized coal blending of coal-rock, which aims to stabilize and improve the coke quality and reduce the coal blending cost, can form a prediction model with multiple parameters and high accuracy for the coal quality indexes and the coke quality indexes, and simultaneously, has a real-time updating function or a manual intervention function.

The invention discloses a Russian fat coal participant coking and coal blending method, which comprises a step of mixing and blending various single coking coals. The single coking coals in percentage by weight comprise 0-6 percent of gas coal, 8-12 percent of Russian fat coal, 15-18 percent of 1/3 coking coal of G being more than 85, 12-15 percent of 1/3 coking coal of G being less than 85, 15-20 percent of coal of G being more than 85, 20 percent of coal of G being less than 85 and 15-20 percent of lean coal. Under the process condition without stage crushing, coal briquette process or tamping coking, the method of the invention reasonably and efficiently utilizes the Russian fat coal, the coke quality is not deteriorated, and the coal blending cost can be reduced.

The invention relates to a coking coal blending method with the participation of lean coal, which comprises the step of blending various single coking coals. The singe coal coals include lean coal, wherein the special interval proportion of the lean coal with a vitrinite reflectance Rmax less than 1.35% is larger than 45%, and the lean coal is 16 to 20% the total weight of the coking coals; or the special interval proportion of the lean coal with a vitrinite reflectance Rmax within 1.35 to 1.70% is larger than 65%, and the lean coal is 13 to 15% the total weight of the coking coals; or the special interval proportion of the lean coal with a vitrinite reflectance Rmax larger than 1.70% is larger than 70%, and the lean coal is 8 to 12% the total weight of the coking coals. The method can achieve quantitatively and maximally reasonable usage of lean coal in national standard classification on the premise of coke quality stabilization, thus reducing the coal blending cost.

The invention discloses a coking coal blending method using weakly-caking coking coal. In the method, the proportion of the coking coarse-grain mosaic texture of the blended coal is used as a control index; and by adjusting the dosage of the coking coal 1#, coking coal 2#, fat coal and 1/3 coking coal in the blended coal and mixing the coking coals to obtain the blended coal, the dosage of the weakly caking coal is increased, the coal resources are reasonably used, and the coal blending cost is remarkably reduced, wherein in the coking coal 1#, the proportion of the coking coarse-grain mosaic texture is greater than 60%; in the coking coal 2#, the proportion of the coking coarse-grain mosaic texture is less than 60%; in the fat coal, the caking index G is greater than 85, the proportion of the dry-ash-free volatile component Vdaf is less than 32%, and the maximum thickness Y of a gelatinous layer is greater than 25mm; and in the 1/3 coking coal, the caking index G is greater than or equal to 85, and the proportion of the coking coarse-grain mosaic texture is greater than 40%. Moreover, without the coal moisture control and briquetting technology and the pre-crushing technique, the CSR of the coke smelted by a coke oven higher than 60m is greater than 63%.

The invention discloses a coal quality evaluating method and a distributing method of highly-metamorphic coking coal based on a coke optical texture structure. According to the coal quality evaluating method, according to the sum of a coarse grain embedding structure with an optical homochromatic region size of 7-10 micrometers of the highly-metamorphic coking coal and an incomplete fiber structure and the difference of sums of a medium-grain embedding structure, a coarse-grain embedding structure and the incomplete fiber structure, the highly-metamorphic coking coal is respectively evaluated as high-quality coking coal, common coking coal and inferior coking coal. According to the difference of the coal quality of the metamorphic coking coal, different distributing methods are provided. Coal is distributed according to the evaluating method of the invention, the distribution amount of gas coal can be correspondingly increased or reduced according to the difference of coal quality of the highly-metamorphic coking coal, and thus the coal distributing cost and the coking coal quality are effectively taken into account.

The invention discloses a coking and coal blending method with participation of gas coal, which comprises the step of blending the gas coal with the caking index G value of 50-70; coking coal No.1 with the coking coarse grain mosaic texture proportion of more than 60 percent; coking coal No.2 with the coking coarse grain mosaic texture proportion of below 60 percent; fat coal with the maximum Gieseler fluidity (MF) of more than 60000ddpm, the Arnu-Audibert's dilatometer b value of more than 150 percent, and the coking coarse grain mosaic texture proportion of more than 40 percent; and blending 1/3 coking coal and lean coal; and controlling briquette blend to be with the coking coarse grain mosaic texture proportion of more than 35 percent, the caking index G value of 79-82, and the thickness of colloidal matter layer of 17-19mm. Due to the prepared briquette blend, not only is the compounding amount of the gas coal increased to 5-15wt percent, but also the compounding amount of the coking coal and the fat coal is reduced, the coking coal resources can be utilized reasonably, the coal blending cost is reduced, the CSR of the coke refined through a coke oven with the height of more than 6m is greater than 63 percent under the technological conditions of non-step crushing, briquette coal process or tamping coking and the like.

The invention discloses a production process for refining large blast furnace cokes by using high-ratio low-heat-state coals. The production process comprises the following operation steps: (a) the oxygen enrichment rate of a blast furnace is 5%; and the gas quantity of a bosh is adjusted; (b) the area of a wind port is reduced; the wind speed is guaranteed about 265 m/s; and the air blowing kinetic energy is about 11000 kg.m/s; (c) the proper theoretic combustion temperature of the wind port is 2180-2230 DEG C; the wind temperature is kept in 1130-1170 DEG C; and the moisture is increased to 20-30 g/t; (d) the coal ratio is increased to 150 kg/t; the coke ratio is kept invariable; the fuel ratio is increased to 565 kg/t; the proper gas quantity is kept; and the furnace top temperature is not lower than 120 DEG C; and (e) the distribution system and the ore batch weight are adjusted; the distribution mode is PWC12345 43321 PWO12345 33321; the ore batch is 62 t-64 t; and according to the top temperature, the ore coke batch weight is adjusted according to the same ratio to guarantee two coal gas flows of the center and the edge of the blast furnace. Meanwhile, a corresponding smelting operation system is formulated according to the method.

The invention discloses a coal blending method capable of increasing the blending amount of gas coal. The method comprises the following steps: 1) controlling the reasonable granularity of gas coal; 2) determining and analyzing the volatile compounds, caking index, coarse grain mosaic structure and maximum average vitrinite reflectivity of each coking coal, wherein according to determined values of the above-mentioned indexes, coking coals are respectively recorded as the coking coal No. 1 and the coking coal No. 2, and 1/3 coking coals are respectively recorded as the 1/3 coking coal No. 1 and the 1/3 coking coal No. 2; and 3) determining the blending proportion of each coking coal. According to the invention, through controlling of granularity of gas coal and selection of appropriate coking coal varieties, no or a small amount of high-quality coking coal may be blended, coal properties of different coking coals are given to full play, the blending proportion of gas coal is increased, and coal blending cost is reduced. Dry quenching CSR of a top-mounted coke oven with a height of more than 6 m is no less than 65.0% without coal-free humidifying, coal molding, tamping coking or the like.

The invention relates to a method for carrying out coal source development by comprehensively applying coal petrography indexes. The method comprises the following steps of: I, carrying out coal petrography analysis on a new coal type, and judging coal as a single coal type when reflectivity standard deviation is less than 0.10; II, analyzing the coal quality indexes on the coal, and comparing ash content, volatile content, sulfur content, a caking index G value and a colloidal layer thickness Y value with those of a coal type which is in use; III, evaluating the coking property of the new coal type by using an experimental coke oven, and comparing with a substituted coal type, wherein coke strength indexes include M40, M10, CRI and CSR; IV, substituting the new coal type for the coal type which is in use according to the proportion of 4%-18%, and experimenting two coal blending schemes by using two experimental coke furnaces, wherein the coke strength indexes include M40, M10, CRI and CSR; V, trying to use the new coal type on an industrial 7.63 m coke furnace, and inspecting the coke strength indexes including M40, M10, CRI and CSR. The method disclosed by the invention can be used for partially or wholly substituting the coal resource which is in use so as to widen the selecting range of the coal resource.

The invention relates to the field of measurement of the quality of coke, specifically, to a method for evaluating the after-reaction strength of coke. The method comprises: after coke is heated to a lower limit value of a reaction temperature range, starting to lead reaction atmosphere in for a reaction; raising the temperature at a constant speed during the reaction while allowing the temperature to exactly reach an upper limit value of the reaction temperature range after the reaction is over, and keeping the flow of auxiliary atmosphere constant during the reaction; adjusting flow of CO and CO2 to make the actual weight loss rate fit the calculated weight loss rate of the coke from beginning to end till the coke reaches a set final weight loss rate; cooling the reacted coke; and performing a drum test to obtain the after-reaction strength of the coke. According to the method, a reaction process of coke in a blast furnace can be well simulated, so that the value of the after-reaction strength can truly express the use condition of the coke in the blast furnace. The cost of coal blending is greatly reduced, and overestimate of some performance of the coke is avoided. The cost of hot metal is ultimately reduced, and the quality of the hot metal is improved.

The invention discloses a method for a high-volatile fat coal to participate in coking and blending coal with Vdaf greater than or equal to 34%, the method determines Gieseler fluidity of the high-volatile fat coal and Audiberts-Arnu dilatation b value; the high-volatile fat coal which is characterized in that the Audiberts-Arnu dilatation b value is greater than 120%, the maximum fluidity MF is greater than 50000ddpm, the solid soft region is greater than 100 DEG C is taken as a fat coal 1#, the high-volatile fat coal which is characterized in that the above index can not be satisfied is taken as a fat coal 2#; the fat coal 1# and the fat coal 2# are respectively used for high-quality fat coal, gas coal or 1/3 coking coal, the quality index of the mixed coal is satisfied by 26-28% of volatile component, less than 10% of ash content, -6-10% of Audiberts-Arnu dilatation b value and 375-385 DEG C of the softening temperature. The coal blending and coking are carried out according to the method of the invention, the coke quality can be effectively enhanced, the coal blending cost is reduced, and the coke intensity through coking is high.

The present invention is one kind of technological scheme of stamping method and apparatus in top coal loading coke oven, and the technological scheme has coal stamping inside the carbonizing chamber. By means of the coal leveling rods capable of being stretched into the carbonizing chamber, bar pressure heads may set on the coal leveling rods and loaded into the carbonizing chamber, and pressure rods connected to the bar pressure head are stretched into the carbonizing chamber through the coal loading ports. The coal leveling rods are first unloaded from the carbonizing chamber, and while loading coal, the bar pressure heads driven by the pressure rods and the lifting mechanism stamp the coking coal. The coal leveling rods are then stretched into the carbonizing chamber to support the bar pressure heads for separating with pressure rods and withdrawing from the carbonizing chamber before entering the coking step.

The invention relates to a method for coal coking and blending based on organic sulfur-enriched high sulfur coke and fat coal. The method comprises the following steps: replacing 5 to 15% of low-sulfur fat coal and/or low-sulfur coke coal in low-sulfur coking coal with organic sulfur-enriched high-sulfur fat coal or high-sulfur coke coal to obtain primary modified blend coal; then blending 20 to 40% of high-volatile-component low-sulfur non-coking coal to obtain secondary modified blend coal; and finally blending 1 to 8% of adhesive to obtain modified blend coal for coking. The modified blend coal obtained by the method disclosed by the invention can be coked according to a normal coking step. According to the method for coal coking and blending, high-quality coking coal resources can be saved, poor-quality high-sulfur coking coal is reasonably utilized, the resource range of coking coal is expanded, and the coal blending cost is reduced.

The present invention is one kind of technological scheme of coking coal stamping method and apparatus in top coal loading coke oven, and the technological scheme features coking coal stamping apparatus in the coke discharging end of the top coal loading coke oven. The coking coal stamping apparatus forms stamped coal cake in the shape corresponding to the carbonizing chamber and the coal cake is fed into the carbonizing chamber via the coke discharging door before coking. The coking coal stamping apparatus is one stamping machine, which has stamping bin in the shape corresponding to that of carbonizing chamber and with side walls capable of being opened by means of the bin wall moving mechanism.

The invention provides a large-ratio lean coal coking method which comprises the following steps: uniformly mixing the following coal: 50-60wt% of coal of which Rmax is 1.5-1.7%, 10-15wt% of coal of which Rmax is 0.6-0.9%, 15-25wt% of coal of which Rmax is 0.9-1.2% and 10-25wt% of coal of which Rmax is 1.2-1.5%; transferring into a stamp-charging coke oven; and under the conditions that the machine side temperature is 1315-1325 DEG C, the coke side temperature is 1325-1335 DEG C, the coke cake center temperature is 970-1000 DEG C, the observation hole pressure is 5-10 pa, the gas collecting tube pressure is 100-120 pa and the branch gas flue suction force is 235-245 pa, coking for 25-28 hours to obtain coke meeting the requirements of blast furnace ironmaking. Thus, the invention effectively solves the problems that the coke quality is poor due to lean coal large-ratio coking and coke in the coke oven is difficult to push in the coking process, reduces the coke pushing current by 50 Amperes, effectively lowers the coal blending cost and solves the problem on shortage of coal resources.

The invention discloses a coal quality evaluating and distributing method for highly metamorphic coking coal. According to the evaluation method, the reflectivity of the highly metamorphic coking coal ranges from 1.35% to 1.50%, and the content of inertinite in macerals of coal and rocks is different, so that the highly metamorphic coking coal is evaluated as high-quality coking coal, general coking coal and low-quality coking coal. According to different coal qualities of the highly metamorphic coking coal, different distribution methods are provided. When the coal is distributed according to the evaluation method provided by the invention, the distribution amount of gas coal is increased or decreased correspondingly according to the difference coal qualities of the highly metamorphic coking coal, so that both the coal distribution cost and the coking coal quality are effectively considered.

The invention discloses a gas-fat-doped coking and coal blending method. The gas-fat-doped coking and coal blending method comprises the following steps: firstly, determining the Giseeler fluidity of gas-fat coal to obtain a maximum fluidity MF, and determining a Hoya expansion value b; marking the gas-fat coal with the Hoya expansion value b being greater than 150 percent or the maximum fluidity MF being greater than 70000ddpm as No.1 gas-fat coal; marking gas-fat coal with the Hoya expansion value b being not greater than 150 percent or the maximum fluidity MF being not greater than 70000ddpm as No.2 gas-fat coal; then blending the gat-fat coal according to the following mass percentage: 5-10 percent of No.1 coal, 0-15 percent of fat coal, 20-30 percent of coking coal, 0-5 percent of No.2 gas-fat coal, 35-45 percent of coaling coal and 10-15 percent of lean coal; and enabling the mass standard of the blending coal to meet the conditions that the volatile component is 26-28 percent, the ash content is less than 10 percent, the Hoya expansion value b is -6 to 10 percent and the softening temperature is 375-385DEG C. The coal blending and coking can be carried out according to the gas-fat-doped coking and coal blending method, so that the quality of coke can be effectively improved, the coat blending cost is reduced and the strength of the coke obtained by coking is high.

The invention discloses a coal blending method for improving coke quality in an coke oven carbonization chamber with the width below 500mm, and the coal blending method comprises the following steps: 1) identifying the mass percentage of each single coal in blended coal; 2) controlling the ash content in the blended coal to be Ad<10%, the sulfur content to be St,ad < 0.9%, and G value to be 75-78; 3) directly blending coking coal with the fineness of not less than 60% for coking without passing through of a pulverizer; mixing each coking coal with the fineness of less than 60% in the mass percentage determined in the step 1), then passing through the pulverizer, controlling the fineness to be 75% +/-3%; mixing the coking coal passing through the pulverizer and the coking coal which does not pass through the pulverizer, mixing by a belt process, then entering into a coal tower for standby coking. The method, under the premise of ensuring of the coke quality, combines the actual width of the coke oven carbonization chamber to realize the optimal mixing use of different kinds of coal and different coal resources, and greatly reduces the cost of coal blending.