71 results about "Corex" patented technology

The invention discloses an anti-surge early warning control method of a COREX gas compressor, and relates to control over gaseous fuel supply of a gas turbine and a device, in particular to an anti-surge detection, early warning and adjustment control method of the gas compressor of a CCPP (Combined Cycle Power Plant). The method comprises the following steps of: acquiring compressor inlet conditions through a CCPP monitoring system; determining safety margin, a surge line, a control line and a step protection line; if an operating point (RP) is positioned in a control region adjacent to the control line, linearly adjusting the opening of an anti-surge valve by using a PI adjustment algorithm; and if the operating point is positioned in a control region adjacent to the surge line SLL, performing step control over the opening of the anti-surge valve. According to the method, effective early warning and control adjustment functions can be effectively generated for the operating conditions of a low-voltage coal crusher and a high-voltage coal crusher of the CCPP and an operation state of the entire gas system, the problem of high failure rate of the COREX combined gas-steam combined cycle generating unit can be effectively solved, and the safety and the stability of the unit are improved.

The invention discloses a process for making iron by virtue of a COREX furnace. The COREX furnace comprises a reduction vertical furnace, a fusion gasifying furnace and a washing tower, wherein the fusion gasifying furnace comprises a plurality of air holes and a plurality of oxygen burners, and oxygen is introduced into the fusion gasifying furnace at least through the air holes and the oxygen burners. The process comprises the following steps: (1) burning lump coals by virtue of oxygen introduced into the fusion gasifying furnace, so as to produce high-temperature coal gas; (2) collecting crushed coals obtained by sieving the lump coal, grinding and milling the crushed coals into powdered coal, and burning the powdered coal in a vault region of the fusion gasifying furnace, so as to produce high-temperature coal gas; (3) transmitting high-temperature coal gas to the reduction vertical furnace, so as to reduce iron-containing raw materials loaded into the reduction vertical furnace to be sponge iron; and (4) inputting sponge iron into the fusion gasifying furnace, and restoring sponge iron to be molten iron in the fusion gasifying furnace. By virtue of the process for making iron by virtue of the COREX furnace, the partial lump coals are replaced by virtue of powdered coal, so that the cost is saved.

The invention aims to provide a fast-setting castable for a main runner for a COREX furnace and a production technology thereof. The fast-setting castable for the main runner for the COREX furnace can be used for repairing the main runner within a short time in the thermal state as well as for tapping recovery, further ensures the consistency of production, is long in service life and convenient for repairing operation and reduces the labor intensity of workers. To achieve the effects, the fast-setting castable for the main runner for the COREX furnace is characterized in that the fast-setting castable comprises the following components: aluminas, silicon carbide, carbonaceous materials and additives. Through the technical scheme, the aluminas different in nature and grain size are mixed according to the specific percentage, and since the extra additives and the novel processing technique are adopted, the newly cast runner can allow 80,000 tons iron to be output; the service life of the fast-setting castable is more than twice of that of the former ordinary low cement castable; and furthermore, the fast-setting castable is particularly outstanding in fast-setting, can meet the requirements of on-site tapping within 8-hour operating time and has remarkable effect as a repairing material.

The invention discloses a filling bed COREX stove braise preparing and blowing method which comprises the following steps of: a) putting mine run coal which is applicable to melting in the COREX stove and producing reducing gas into a run coal bin by crushing and screening the mine run coal into crushed coal; b) milling the crushed coal to minus 200 meshes and above 60 percent by a coal-milling device provided by a coal feeder and carrying out drying at the same time; and c) putting the finished braise into a pulverized coal bunker after the separation of gas and powder; loading the braise into 2 or 3 coal injecting tanks sequentially; transporting the braise to a distributor mechanism positioned at the top of a melting gasification furnace of the COREX stove by using pressured gas after the processes of pressurizing fluidization and gas supplement; distributing the braise to the blowing branch pipe which is led to the oxygen tuyere of the melting gasification furnace; spraying the braise into the melting gasification furnace by a coal injection gun. The method has the advantages that the in-place digestion and utilization of powder sifted range coal of the filling bed COREX stove is realized; and the total coal consumption of the COREX stove can be reduced by replacing part range coal; therefore, the cost of production is reduced; more optimized COREX melting reduction process and more flexible operation are realized.

The invention discloses a corundum-mullite composite brick for a COREX furnace and a preparation method thereof. The raw materials of the corundum-mullite composite brick are composed of a corundum-mullite homogenized material, white corundum, andalusite, a-Al2O3 powder and binding clay, as well as paper pulp liquid waste. The preparation method comprises the steps of firstly, preparing raw materials with various particle sizes according to the ratio; then, using raw materials with particle sizes of 1-3mm and particle sizes smaller than 1mm as aggregate to perform dry mixing, adding a paper pulp liquid waste mixture, finally adding the residual raw materials, and milling to obtain a pug; sequentially performing material trapping, press forming and drying on the obtained pug, and finally roasting to obtain a product. The corundum-mullite composite brick produced in the invention has very low porosity, high compression strength and excellent thermal shock resistance and corrosion resistance, can completely satisfy the harsh application environment of the COREX furnace, and can prolong the service life.

The invention relates to a dedusting and dehumidifying method and equipment thereof for furnace top coal gas of a blast furnace, a converter or a COREX furnace. The method comprises the steps of precooling, self-circulation cooling, re-cooling, demisting and self-circulation heating and rewarming. The equipment comprises a stream guide plate, a precooler, a self-circulation cooler, a first water discharge section, a cooler, a second water discharge section, a demister, a rewarming heater and an outlet stream guide plate which are sequentially arranged between a gas inlet and a gas outlet in a shell. The method and the equipment are used to reduce the emission of dust and the pollution to the air. The heat of gas at the inlet and the cold output of gas at the outlet are recycled so as to repeatedly utilize energy sources and save the energy source consumption; the relative humidity of coal gas treated by the method and the equipment is reduced, thereby the occurrence of condensed water in the process of pipeline conveying is reduced, the corrosion action to the pipeline is reduced and the safety is improved; in addition, the reduction of the relative humidity of the coal gas improves the thermal value of the coal gas.

A flux-corex welding wire fed downward vertically for gas shielded welding is composed of skin made of low-carbon steel and flux core containing TiO2 (20-40 wt%), Al2O3 (1.2-7), ZrO2 (3-8.5), MgO (0.5-3), NaF+K2SiF6 (1.2-4), deoxidizing agent which is one or more of Si, Mn, Ti, Al and Mg (11-20), alloying agent which is one or more of Ni, Cr, MO, Cu and V (less than 5) and Fe (rest).

The invention discloses a hydraulic control method for a COREX slag pulverizing system and relates to the technical field of hydraulic control. A control operating system consists of an electromagnetic reversing valve (1), an electromagnetic reversing valve (2), an electromagnetic reversing valve (3), an electromagnetic reversing valve (4), and electromagnetic reversing valve (5), an electromagnetic reversing valve (6), an electromotor (7), a PT1 pressure sensor, a PT2 pressure sensor, a PT3 pressure sensor and a PT4 pressure sensor. According to the process flow, the hydraulic control method forms a logic relation of different working states through central control DCS operation, realizes a series of actions including the rising, declining, pressure maintaining of a grinding roller through controlling the switches of a plurality of the electromagnetic reversing valves, can automatically judge the needed adjustment under various operating conditions and realize the actions through controlling the electromagnetic reversing valves so as to make the whole system more intelligent. The hydraulic control method improves the prior inapplicable hydraulic control method, meets the requirement of the COREX slag pulverizing process, and has the characteristics of convenient operation, high intelligence degree and the like.

The invention relates to a start control process for a COREX slag grinding production control system. The control system comprises a vertical grinding host machine (G), and a lubricating sub-system (A), an air compressor sub-system (B), a finished product conveying sub-system (C), a dust collection sub-system (D), a crude material circulation sub-system (E) and a hot air furnace sub-system (F) serving as assistance, as well as a feeding sub-system (H) and a water supply sub-system (I). The start control process comprises the following concrete steps: (1) checking and confirming the state of each assisted device; (2) implementing start on each sub-system based on the sequence of A-I; and (3) adjusting fineness, regular checking, and adjusting parameters of related systems. The process recombines the sub-systems of the conventional process, strictly starts according to a certain sequence with rigorous procedure, and is advantageous to production operation and production stability; a related hydraulic unit is firstly started so as to contribute to normal operation of subsequent equipment and improve the service life of the equipment.

The invention relates to solid phase microextraction, particularly an application of the solid phase microextraction in content analysis of naphthalene in Corex furnace gas. The invention is characterized by inserting an extraction head of solid phase extraction capillary fibers in a sampling bottle, extracting naphthalene in the concentrated gas, and then carrying out sample injection analysis on the fibers in a gas phase gas phase analyzer. According to the invention, the acquisition process of naphthalene in gas is greatly simplified; by adopting the solid phase microextraction technique, the sensitivity of the analysis is greatly raised; the advantages of simpleness, fast analysis, good correctness, no toxicological harmless, no pollution and the like are achieved; and the process can be prevented from being influenced by water vapour and other impurities in gas simultaneously.

The invention discloses COREX smelting reduction iron making equipment and an iron making method. A distributive raw material feeding device rotates to feed raw materials into a vertical furnace reduction furnace; and a spiral stirrer rotates to slide the raw materials along a spiral plate. Compressed carbon monoxide enters a hollow rotating shaft from the upper end for blowing out from the lower end. A pulverized coal spraying device 2 sprays pulverized coals into space of an exhaust insulation pipe of a smelting gasification furnace above an exhaust port of the vertical furnace reduction furnace; and the discharged pulverized coals are rich in oxygen, so that the pulverized coals are insufficiently burnt to heat the raw materials falling from the spiral stirrer. Carbon monoxide and iron ore powder in the spiral stirrer are reacted to generate carbon dioxide and sponge iron. Compressed and heated carbon monoxide enters sponge iron from the lower part of the vertical furnace reduction furnace. Sponge iron is conveyed on a fire grate of the smelting gasification furnace. The pulverized coal spraying device 1 sprays the pulverized coals below the fire grate in the smelting gasification furnace for combustion; and heat generated by combustion of the pulverized coals melts sponge iron and furnace slag falling on the fire grate. The heated carbon monoxide is blown into molten iron of the smelting gasification furnace.

The invention belongs to the technical field of non-blast furnace iron making, and particularly relates to a method for drawing metallurgical performance evolution graphs of fuel in COREX gasificationfurnaces. The method includes steps of 1), establishing height-temperature relations of fuel columns by means of CFD (computational fluid dynamics) simulation software modeling and numerical value emulation on the basis of design parameters of the COREX gasification furnaces, basic performance of crude fuel and operating parameters of gasification furnaces; 2), establishing corresponding relations between temperature values of simulation lumped fuel under the conditions of height values and metallurgical performance numerical values of the lumped fuel and further drawing temperature-performance relation curves of the lumped fuel; 3), carrying out mapping association on height-temperature relation curves of the fuel columns and the temperature-performance relation curves of the lumped fueland acquiring height displacement-performance evolution graphs of the lumped fuel by the aid of data processing software and drawing software which are combined with each other. The method has the advantages that performance evolution of different types of lumped fuel in the gasification furnaces can be pertinently systematically analyzed by the aid of the method, the method is beneficial to scientifically recommending adding proportions and utilization modes for the lumped fuel, blast furnaces can assuredly stably smoothly run, and different types of fuel can be optimally utilized.

The invention discloses a method for inhibiting bonding of pellets in a COREX shaft furnace and belongs to the technical field of melt reduction ironmaking. The method comprises (1) roasting green pellets to obtain finished products of oxidized pellets, (2) placing the roasted oxidized pellets into a disc pelletizer, spraying water to wet the pellets, carrying out rotation of the pelletizer along with addition of solid inhibitor powder and spraying of a certain amount of water so that the pellets are uniformly coated with solid inhibitor layers and coated pellets are prepared, and (3) drying the coated pellets, adding the coated pellets into a load reduction furnace and carrying out reduction at a reduction gas temperature of 800-950 DEG C. The method can effectively improve the problem of the agglomeration of the pellets in the COREX shaft furnace process, is beneficial to smooth production of the pre-reduction furnace, improves utilization efficiency of the COREX shaft furnace, and reduces a direct reduction iron production cost. The reduced pellets have a bonding index less than 25%.

The invention discloses a coating material capable of restraining pellet binding inside a COREX shaft furnace and a preparation and application method thereof, and belongs to the technical field of smelting reduction iron-making. The coating material is composed of soft calcined dolomite, Ca(OH)2, anthracite and water. The mass proportion of the soft calcined dolomite to the Ca(OH)2 to the anthracite is 6:1:2-4:1:2. The mass sum of the soft calcined dolomite, the Ca(OH)2 and the anthracite accounts for 30%-35% of the total mass of coating mixed liquor. The preparation method of the coating material includes the following steps that (1) green pellets are roasted to form oxidized pellets; (2) the surface of each oxidized pellet is coated so that coating pellets can be prepared; and (3) the coating pellets achieve reduction. By means of the coating material capable of restraining pellet binding inside the COREX shaft furnace and the preparation and application method thereof, the binding phenomenon happening between the pellets inside the COREX shaft furnace can be effectively avoided; and meanwhile the metallization ratio cannot be lowered, direct motion of the shaft furnace and quality of the obtained product are guaranteed, and the production efficiency is improved.

The invention discloses an anti-corrosion treatment method for a bottom plate of a COREX gas holder. The anti-corrosion treatment method is implemented according to the following steps: 1, filling corrosion pits by using electric welding; 2, carrying out sand blasting to remove rust; 3, cleaning: cleaning the qualified surface with alcohol or acetone before coating first primer; 4, spraying a polyurea elastomer, namely starting to spray a polyurea elastomer anticorrosive material by adopting a polyurea elastomer spraying machine under the conditions that the pressure is 2,500/3,200 psi, the system temperature is 60-75 DEG C and the raw material temperature is kept above 20 DEG C after each system runs normally; constructing at the temperature 3 DEG C higher than the dew point temperature, conducting spraying operation by mixing the materials according to the volume ratio of 1: 1, performing temperature control during polyurea spraying construction, detecting the temperature of a raw material barrel firstly and keeping the temperature at 19 DEG C or above, not connecting a spray gun firstly, measuring the temperature of an output tail end of a heating hose, wherein the temperature ranges from 60 DEG C to 70 DEG C, and checking the thickness of a coating on a steel substrate through a thickness gauge, wherein the thickness is not less than 1.5 mm; and conducting an adhesive force test after each coating construction; and 5, conducting electric spark testing.

The invention discloses a blocking cleaning process for a COREX smelting reduction furnace dust-removal system, which comprises blocking cleaning of a dust recycling system and heat whirlwind blocking cleaning. The blocking cleaning of the dust recycling system comprises the following steps of clearing a collection tank, clearing a TP chamber, and clearing a fluid dust bin. The heat whirlwind blocking cleaning comprises the following steps of connecting a bent pipe on a fifth valve, opening the valve, observing the blanking situation of a dustbin on a ground floor; and opening a nitrogen valve of the TP chamber to introduce nitrogen according to the requirement. Or the heat whirlwind blocking cleaning comprises the following steps: poking an accumulated material from a bypass of the bent pipe by a steel bar; then removing a corrugated tube of a hydraulic ball valve on the upper part, and poking the accumulated material from the bottom to top by the steel bar; observing the situation of the accumulated material on heat whirlwind, and when the accumulated material is lower than the lower edge of a man hole, clearing the accumulated material on a grating in the heat whirlwind by operating personnel; and closing a heat whirlwind large man hole, removing the bent pipe, and blocking a blind plate on the bent pipe. By adopting the proposal, the process can better complete the blocking cleaning work of the whole dust-removal system, and meets the production requirement. The process has the advantages of reasonable process, good blocking cleaning effect and the like.

The invention provides a treatment system of a furnace top gas of a COREX vertical furnace. The treatment system comprises the COREX vertical furnace and a gravity dust remover connected with the COREX vertical furnace; the treatment system of the furnace top gas of the COREX vertical furnace further comprises a first atomization rapid cooling device arranged on the furnace top of the COREX vertical furnace, a second atomization rapid cooling device arranged inside the gravity dust remover, a cloth bag dust remover connected with the gravity dust remover, and a flow adjusting device connected with the cloth bag dust remover. The invention further provides a treatment method of the treatment system of the furnace top gas of the COREX vertical furnace. According to the treatment system of the furnace top gas of the COREX vertical furnace, disclosed by the invention, on the basis of common gas dry-method dust-removing treatment configuration, adjustable and controllable atomization rapid cooling equipment and control technology, and gas flow adjusting and controlling equipment and technology are combined to realize the accurate online control on temperatures, flows and pressure of the gas; the flow adjusting device is simple in equipment and convenient to operate, and all valves of a valve group have different adjusting ranges and precisions, so as to meet the requirements on adjusting a gas amount when a working condition of the vertical furnace is changed.

The present invention provides a dust recycling system for directly smelting reduction iron making process, which is used for increasing efficiency. The dust recycling system to capture dust from reduction gas and inject the same back into the melter gasifier for dust burning in a smelting reduction iron making process comprising a hot gas cyclone (HGC), a low dust bin (LDB) in operative connection to said hot gas cyclone for continuous flow of the captured dust through a hot knife gate and valve vertical pipelines provided at an inclination ranging from 4 to 12; said low dust bin (LDB) further operatively connected through a vertical pipeline and an inlet to a high dust volume T-piece (TP) comprising of injector and diffuser means; and a melter gasifier having dust burner to burn the dust thus recycled into the melter gasifier through said T-piece. The above system is adapted to favour effective and jam free transportation of dust from the hot gas cyclone to the dust burner and thereby improve plant availability/efficiency.

The invention discloses a method for recycling slag from non-blast furnace ironmaking by a COREX smelting reduction process, which comprises the following steps that: firstly, COREX slag is processed into COREX slag powder; and the COREX slag powder is used in a gelatinous material for preparing concrete. After the concrete is naturally cured for 28 days, the strength of the concrete prepared by the formula of the 350 kg/m<3> gelatinous material disclosed by the invention reaches 32 to 48MPa, and the strength grade of the concrete reaches C30 to C40. Therefore, the method solves the problem of difficult COREX slag recycling and avoids resources waste and environmental pollution. And the recycling method is simple, easy to implement and practical and creates remarkable social, economic and environmental benefits.

The invention discloses a production system for coated pellets of COREX shaft furnace and belongs to the technical field of pellet production equipment. The production system comprises a roasting furnace, a conveying mechanism, a spraying mechanism and a mixing tank, wherein the roasting furnace is connected to a circular cooling area in a conveying manner. Oxidized pellets to be coated in the circular cooling area are conveyed through the conveying mechanism. The spraying mechanism is positioned above the conveying mechanism. Through the spraying mechanism, a coating mixed liquor inside the mixing tank is sprayed onto the surface of the oxidized pellets to be coated. By the production system for production of the coated pellets, the caking problem of pellets in a COREX shaft furnace technology can be effectively improved, and the system is also beneficial to direct motion of a COREX pre-reduction shaft furnace and helps raise utilization efficiency of COREX shaft furnace equipment and reduce production cost of direct reduction iron. Caking index of reduced pellets is less than 25%.

The invention discloses a COREX method for reducing coal gas components through coal gas blending adjustment. The COREX method comprises the following steps: step I, coal blending, wherein the types of several kinds of lump coal are gas coal (Ad=4-5, Vd=37-42), steam coal 1 (Ad=5-6, Vd=26-30) and steam coal 2 (Ad=2-3, Vd=24-26); the particle size of the three kinds of coal is 0-60 mm; the supplying amount of the gas coal takes up 38-42% of the weight of the whole matching coal; the supplying amount of the steam coal 1 takes up 18-21% of the weight of the whole matching lump coal; the supplying amount of the steam coal 2 takes up 37-44% of the weight of the whole matching lump coal. According to the COREX method, through the cooperation of different lump coal, the effective components in reduced coal gas are increased, the reduction metallization ratio of ore is increased, the coke consumption during the COREX reduction process is reduced, and the production cost is reduced.

The invention discloses a technology for preventing seepage of a suspended water cooling pond wall of a corex furnace by means of reaming, pipe penetrating and blocking. The technology comprises the steps that firstly, an original pipe penetrating hole in the pond wall is reamed, and after reaming is finished, a pipe is sleeved with an inner flange piece in advance, the inner flange piece is closely attached to the pond wall, and then the inner ring of the inner flange piece and the outer wall of the pipe are fully welded; grouting at the initial stage is carried out, grouting and tamping are firstly carried out in a cavity formed by the pipe and the lower portion of the pond wall, the weight ratio of components, namely, high-strength quick-dry contraction-free cement mortar to small gravel to alkyd enamel to water, of grout during grouting at the initial stage is 4:1:1:8, outer flange pieces are used for blocking, then the pipe wall is beaten every other 20 min to 30 min to generate vibration, gaps are filled till the cavity is thoroughly full, and the outer flange pieces are covered with wool felt; and secondary smearing is carried out, after 3 days to 5 days, coating is smeared to the outer surfaces of the outer flange pieces, the weight ratio of components, namely, high-strength quick-dry contraction-free concrete mortar to washed-out sand to paint to water, of the coating is 4:1:1:4, and water can be injected for testing after standing is carried out for 2-3 days and impurities in a pond are cleared away.

A formed coke preparation method for replacing a carbon raw material used for electric furnace steel making with COREX coke powder includes the specific process steps of firstly, smashing the COREX coke powder into powder; secondly, adding and processing binding agents and conducting material forming; thirdly, charring materials at a high temperature; fourthly, cooling formed coke. According to the formed coke preparation method for replacing the carbon raw material used for electric furnace steel making with the COREX coke powder, the prepared formed coke can replace the carbon material (such as coke) used for electric furnace steel making, and therefore the consumption of electric furnace steel making carbon-graphite electrodes is lowered, the production cost of electric furnace steel making raw materials is greatly reduced, and quailed liquid steel can be produced. By means of the preparation of the formed coke, a new route is provided for utilization of a large amount of coke powder, especially the COREX coke powder, generated in the transporting, loading and unloading processes. Utilization of the coke powder has higher value, and new cost saving possibility is provided for coking enterprises and coke utilizing enterprises on the aspect of coke utilization.

The invention provides a device and a method of COREX melting reduction ironmaking. The device comprises a reduction shaft furnace and a melting gasifier, the reduction shaft furnace is connected with the melting gasifier through a down pipe. The device for the COREX melting reduction ironmaking also comprises a temperature measurement thermocouple, a controller, a regulating valve, a flowmeter and gas pipes. The controller is connected with the temperature measurement thermocouple, the regulating valve and the flowmeter. The gas pipes comprise a cold coal gas pipe and a transmission pipe, gas passing through the transmission pipe to enter the down pipe comprises cold coal gas, and the flowmeter and the regulating valve are both arranged on the transmission pipe. The controller controls the regulating valve according to feedback data of the flowmeter and the temperature measurement thermocouple, and then opening/closing and amount of the gas passing through the gas pipes to enter the down pipe are regulated and controlled. The device and the method employ the temperature measurement thermocouple and the cold coal gas to monitor the temperature in the down pipe, and reduce the impact of the gas going into the reduction shaft furnace on temperature.