536results about "Dust arresters" patented technology

A process for energy- and emission-optimized iron production and an installation for carrying out the process. A first partial amount of a generator gas produced in a melter gasifier is used as a first reducing gas in a first reduction zone. A second partial amount is fed to at least one further reduction zone as a second reducing gas. In addition, after CO₂ scrubbing, a partial amount of top gas removed from the first reduction zone is admixed with the generator gas after the latter leaves the melter gasifier, for cooling the generator gas.

In the method of producing reduced iron according to the invention, fine iron oxides and powdery solid reductants are mixed, compacted into sheet-like compacts, and charged onto the hearth of a reduction furnace for reduction while maintaining the temperature inside the furnace at not less than 1100 DEG C. As the sheet-like compacts can be obtained by compacting mixture of raw material by use of rollers or the like, processing time is much shorter than the case of pelletization or agglomeration. A drying step is unnecessary since feeds are placed no the hearth via a feeder chute or the like. The method is carried out with ease by use of the facility according to the invention. High quality hot metal can be produced by charging reduced iron in hot condition obtained by the method described as above into a shaft furnace or a in-bath smelting furnace for melting at high thermal efficiency.

An electric composite rotating machine haveing two rotors, capable of developing mechanical power and of runing on two rotational direction at selfadjutable speeds, of differential type, with 40% increase of output, doubling the torque at 30% reduction of used electrical energy.

A method and apparatus for reducing iron oxides using microwave heating in a furnace chamber which is sealed against the entrance of air reduces the energy required and produces a low temperature reduction and allows the recovery of combustible synthetic gas as a byproduct of the process. Avoidance of the reduction of sulfur, phorphorus and silica is also insured, as is the need to reduce the silica content of the feed material prior to reducing the ore. A continuous rotary hearth furnace, a rotary kiln, a linear conveyor and vertical shaft furnace chamber configurations are described. A secondary heating zone can also be included to process the reduced iron into iron nuggets or liquid metallic iron.

The invention provides a system and a technology for environmentally-friendly comprehensive treatment of iron making blast furnace gas. The system comprises a blast furnace top uniform pressure gas full-recovery system, a gravity deduster and a dry bag filter, and further comprises a blast furnace gas hydrolysis tower and a blast furnace gas desulfurization tower. The blast furnace gas goes through the gravity deduster and the dry bag filter, and then is conveyed into the blast furnace gas hydrolysis tower, COS in the blast furnace gas is hydrolyzed by the blast furnace gas hydrolysis tower toform H2S; the treated blast furnace gas goes through a TRT/or pressure regulating valve group, and then is conveyed into the blast furnace gas desulfurization tower, and the blast furnace gas desulfurization tower desulfurizes and dechlorinates H2S and Cl<-> in the blast furnace gas; and the treated blast furnace gas is conveyed into a blast furnace gas user or is stored in a gas cabinet througha gas pipe network. The integral treatment technology which integrates blast furnace gas desulfurization, dechlorination and blast furnace top uniform pressure gas recovery has a high integration degree, and can run stably and reliably.

The invention relates to a system for rotational flow dust removal and recovery of blast furnace roof raw gas and a recovering method of the blast furnace roof raw gas. According to the system and the method, the blast furnace roof raw gas which is diffused in a pressure equalizing mode from a blast furnace charging bucket is directly fed into a blast furnace gas bag-type dust remover for dust removal, a built-in type round platform-shaped cyclone is additionally arranged on the lower portion of a casing of the blast furnace gas bag-type dust remover, the raw gas which enters the blast furnace gas bag-type dust remover rotates in a tangential direction inside an annular cyclone chamber, then enters an upper portion gas purification chamber and uniformly passes through dust collecting bag groups which are arranged at intervals under the action of a guide plate for dust removal, the structure is good in dust removal effect, and the temperature of the raw gas which enters upper portion gas purification chamber is greatly reduced, so that the service life of bags is effectively prolonged.

A blast furnace gas dry type dust collection method, a paralleled gas drying equipment is provided after the gravity dust collector and before the cloth bag dust remover in the blast furnace gas dry type dust collection system as a constituent part of the blast furnace gas dry type dust collection system, and a temperature sensor is provided on the export of the gravity dust collector; when the system export (the blast furnace) generates low-temperature raw coal gas, the humidity is usually relatively high, before the cloth bag dust remover performs dust exhaustion, the gas from the export of the gravity dust collector passes through the paralleled gas drying equipment, the gas drying equipment firstly performs dehumidification processing to the raw coal gas to remove the water in the raw coal gas, and then enters into the cloth bag dust remover for dust exhaustion; when the temperature of the blast furnace raw coal gas is in a normal range, the blast furnace raw coal gas enters the gravity dust collector through a raw gas pipeline to perform coarse dust exhaustion, and then directly enters the cloth bag dust remover for dust exhaustion, the clean gas after dust exhaustion enter in the pressure reducing valve through a clean gas pipeline for pressure reduction, and finally loads in a gas holder through the clean gas pipeline.

The invention relates to a blast furnace gas deacidification device which comprises a powder spray gun, an injection tank and a gas source, wherein the powder spray gun is connected with a gas pipeline and comprises a spray pipe penetrating the gas pipeline and spray nozzles arranged on the spray pipe; the spray nozzles are located in the gas pipeline; the injection tank is fixedly connected with the powder spray gun through a powder spray pipeline and is provided with a fluidization spray nozzle; and the gas source is connected with the fluidization spray nozzle through a gas pipe and used for conveying an injection carrier. The blast furnace gas deacidification device can absorb most acid gases such as chlorine and sulfur in blast furnace gas, save water and electricity, reduce the generation of high-salinity wastewater, alleviate the corrosion of the gas pipeline and downstream gas user facilities caused by blast furnace gas, and guarantee the calorific value of gas and the generating capacity of a blast furnace top gas recovery turbine unit.

The invention relates to a device for recovering coal gas in the equalizing and relieving process of a furnace top of a blast furnace and belongs to the technical field of the iron and steel industry. The device comprises a blast furnace weighing charging bucket, a equalizing and relieving pipeline connected with the charging bucket, a plurality of types of valves, a cyclone dust collector and a cloth bag dust collector connected in series behind the cyclone dust collector and is characterized in that an ejector is connected in series behind the cloth bag dust collector; crude gas which is equalized and relieved from the blast furnace weighing charging bucket enters the cyclone dust collector to carry out primary dust removal through the equalizing and relieving pipeline and then enters the cloth bag dust collector connected in series behind the cyclone dust collector to form clean gas; and under the action of the ejector, the clean gas is rapidly ejected and enters a clean gas pipe network, so that the rapid relief and recovery of the equalized and relieved coal gas in the weighing charging bucket are realized. The process is simple, is convenient to operate and has low operation and maintenance cost. Besides the economic benefits caused by the recovery of the coal gas, the coal gas and dust discharge can also be reduced so as to generate good social benefits; a conventional process is changed less; and the process is convenient to improve the existing conventional equalized and relieved coal gas system of the blast furnace.

In a copper flash-smelting works, forced oxidation of dust is prevented, adhesion of dust to a boiler water tube is reduced, and on-line ratio and productivity index is improved. The temperature at the WHB radiation section outlet is greatly reduced and the atmosphere within the WHB radiation section is controlled by blowing the mixed gas of nitrogen gas and air from the feed aperture established in the wall into the boiler radiation section of the waste heat boiler of the flash-smelting furnace in a copper flash-smelting works.

A method for operating a blast furnace and a corresponding blast furnace, the method including recovering top gas from the blast furnace, submitting at least a portion of the top gas to a recycling process, and feeding the recycled top gas back into the blast furnace, where the recycling process includes feeding the recovered top gas to a reformer unit, feeding volatile carbon containing material to the reformer unit, proceeding to flash gasification of the volatile carbon containing material in the reformer unit, at a temperature between 1100 and 1300° C., and thereby producing devolatised carbonaceous material and synthesis, and allowing the devolatised carbonaceous material and synthesis gas to react with the recovered top gas.

The invention relates to a pulse bellowing, purifying and dedusting system which can be used in a blast furnace with a variety of capacities in the field of environmental-protection equipment. The invention comprises a pulse bellowing bag-type dust collector, a crude gas pipeline, a purified gas pipeline and a dust transmission pipeline. A purified gas-pressurized backblowing device and an automatic control system can be connected with the crude gas pipeline by pipelines. The crude gas pipeline is connected with the inlet of the pulse bellowing bag-type dust collector; and the purified gas pipeline is connected with the outlet of the pulse bellowing bag-type dust collector. The dust transmission pipeline is connected with the dust outlet of the pulse bellowing bag-type dust collector. The outlet of the purified gas-pressurized backblowing device can be connected with the pulse bellowing bag-type dust collector by pipelines; and the automatic control system can be connected with pulse bellowing bag-type dust collector by signal circuits. The invention can be used when the temperature is about 250 DEG C and can avoid heat waste and secondary pollution. And when factories have no nitrogen gas source, the invention can use the purified gas-pressurized backblowing device to dedust. In addition, the invention has two dust transmission manners which are machinery dust transmission and pneumatic dust transmission.

The invention discloses a dry-process dust-removing and dechlorination combined device for blast furnace gas. The device comprises a power generation device and a reducing valve group which are connected to the back of a blast furnace through a pipeline and connected with each other in parallel, and is characterized in that a grain bed dust remover before the power generation device and the reducing valve group is connected in series with the power generation device and the reducing valve group; and dechlorination grains, desulfuration grains and deamination grains are filled in the grain bed dust remover. The device can be used for conducting dust removing, dechlorination, desulfuration, deamination, moisture absorption, and recycling of residual heat and excess pressure on blast furnace gas effectively, and has the advantages as follows: the suitability on ingredient variation of blast furnace gas is high; problems of corrosion on equipment and pipelines and salification caused by dry-process dust removing are solved; and no corrosion-resistant measure is required in pipelines and equipment to follow-up users. The dust content of purified gas at the outlet of the device is 0 to 5 mg/Nm<3>; the chloride ion content in gas condensed water is smaller than 300 mg/L; and the pH value is 6 to 8.

The invention relates to a group control method of blast furnace gas cloth bag dust catcher system for pipeline dust conveying, which adopts a group control device of the blast furnace gas cloth bag dust catcher system for pipeline dust conveying to realize the multi-stage group control of the blast furnace gas cloth bag dust catcher system. The device comprises a big dust cabin, a plurality of groups of cloth bag dust catchers and a valve bank. The method comprises the following steps of: controlling the sleeve bodies of the cloth bag dust catchers and the pulse blowing nitrogen pressure of the big dust cabin by grade, setting a dust conveying nitrogen pressure, and realizing group control management for the sleeve bodies of the cloth bag dust catchers by separately controlling each dust conveying pipeline. The group control method of the invention can improve the operation efficiency, prolong the service life of equipment, realize the multi-grade control of a dust clearing gas source pressure and safe production of a blast furnace, and is suitable for the improvement of newly-built or traditional de-dusting systems.