30results about How to "Reduce dioxin content" patented technology

The invention discloses a device and a method used for reducing the exhaust of electric furnace steelmaking dioxin, comprising a bag-typed deduster which is communicated with the electric furnace by a flue gas pipeline and a loading device. The invention is characterized in that the pipeline between the electric furnace and the bag-typed deduster is sequentially communicated with a combustion settlement chamber and a temperature reduction device. The method comprises the steps as follows: the electric furnace adopts the molten iron hot charging technique; the steelmaking flue gas enters the combustion settlement chamber for sufficient combustion, then enters the temperature reduction device, with the temperature reduced from 800 to 1000 DEG C at the inlet to below 200 DEG C at the outlet within 1 to 3 seconds, and is finally exhausted after being disposed by the bag-typed deduster; wherein, the content of the dioxin is not more than 0.2ngTEQ/m<3>. The device and the method of the invention reduce the content of the dioxin, generate a plurality of saturated steam at the same time and have the advantages of saving energy and reducing the steelmaking cost.

The invention discloses a household garbage pyrolysis and gasification processing system. A pyrolysis and gasification furnace is included. A smoke exhaust pipeline is arranged on the middle upper portion of the pyrolysis and gasification furnace and communicates with exhaust gas processing equipment. The exhaust gas processing equipment is connected with an induced draft fan. The upper portion of the pyrolysis and gasification furnace communicates with a furnace bottom through a pyrolysis gas pipeline. An electric air valve is arranged on the pyrolysis gas pipeline, the pyrolysis gas pipeline is connected with a condenser, and the condenser is connected with a gas storage tank. The pyrolysis and gasification furnace adopts fuel as an auxiliary drive heat source, and generated pyrolysis gasified gas serves as a main heat source. By utilizing the pyrolysis and gasification system for processing household garbage, the garbage volume and quantity are remarkably reduced, the performance of ash and slag is stable, the dioxin content of generated exhaust gas is extremely low, then the exhaust gas is further processed so that harmlessness of the exhaust gas can be achieved, and environmental pollution caused by garbage incineration is effectively avoided. The two heat sources are combined, so that the problem that a heat source is additionally arranged for external heating type pyrolysis and gasification of garbage is solved, and dependency on conventional energy such as coal and electricity is reduced; and besides, combustible gas can be supplied externally, and the economic benefit of the system is increased.

The invention discloses a secondary combustion device used for treating flue gas containing dioxin. The secondary combustion device comprises a furnace body and injection type combustors, and a furnace cavity is limited in the furnace body. The upper end of the furnace body is provided with a secondary flue gas outlet communicating with the furnace cavity. Trapezoidal protruding ribs are arrangedon the inner circumferential wall faces of the furnace cavity, and the trapezoidal protruding ribs extend spirally in the axial direction of the furnace cavity to form a spiral flow guide groove. A primary flue gas inlet communicating with a primary flue gas outlet of a primary combustion device is formed in the lower portion of the spiral flow guide groove. A combustion sprayer of each injectiontype combustor stretches in the furnace cavity, wherein the combustion sprayer is arranged in the flow guide groove. The combustion sprayer adjacent to the primary flue gas inlet is located on the downstream part, in the extending direction of the spiral flow guide groove, of the primary flue gas inlet, wherein the shortest distance between the combustion sprayer and the primary flue gas inlet islarger than or equal to one time of the caliber of the primary flue gas inlet. According to the secondary combustion device used for treating flue gas containing dioxin in the embodiment, flue gas canbe mixed and burnt sufficiently, the dioxin burning-down rate is higher, decomposing is thorough, and the treatment effect is better.

The invention provides a waste incineration treatment system with a high-temperature dust remover. Flue gas produced by waste incineration is exhausted after being subjected to multistage dust removal purification, first-stage dust removal is completed by the high-temperature dust remover, and collected fly ash is less in dioxin content and capable of being recycled; low-temperature dust removal is adopted by second-stage dust removal and third stage dust removal, the dust removal efficiency is high due to the combination of the second-stage dust removal and the third-stage dust removal, the dust content and dioxin content of the exhausted flue gas are low, and the flue gas is cleaner; activated carbon is sprayed into the flue gas at an inlet of a third-stage remover, dioxin in the flue gas is adsorbed, activated carbon is collected by the third-stage remover and sent back to f hearth of an incinerator, dioxin adsorbed by the activated carbon is disintegrated at high temperature, and the toxicity is removed. The waste incineration treatment system with the high-temperature dust remover has the advantages that the fly ash collected through high-temperature dust removal can be recycled, dioxin adsorbed by the activated carbon is disintegrated at high temperature after being sent back to the hearth, the total quantity of dioxin exhausted from waste incineration is effectively reduced, and the adverse effect of waste incineration on the environment is reduced.

The invention discloses a pyrolysis-gas-recyclable medical waste pyrolysis treatment device which comprises a pyrolysis furnace, accessory equipment and an induced draft fan. The pyrolysis furnace comprises a furnace body, a feed device, a flue gas passage, a pyrolysis gas pipeline, an ash discharging gear and temperature measurement and control systems, and each temperature measurement and control system mainly comprises a temperature sensor, a temperature display instrument and an automatic controller. The accessory equipment comprises a half-dry type scrubber and a bag type dust collector. By reasonable design of the furnace body structure, automatic measurement and control of the furnace hearth temperature is realized, generated pyrolysis gas enters the furnace bottom to be combusted through the pipeline designed specially, and efficiency of the pyrolysis furnace is improved; meanwhile, the problem of inherent tar in pyrolysis equipment is solved, flue gas generated by combustion of the pyrolysis gas is purified prior to being discharged, and harmlessness, reduction and stabilization of treatment of medical waste are realized. In-situ treatment of the medical waste is realized, and secondary pollution caused by transportation is also avoided.

The invention provides a catalyst for catalytic oxidation elimination of dioxin pollutants in flue gas and waste gas from garbage incinerators, hazardous waste incinerators, medical waste incinerators, steel sintering furnaces, coal-fired power plants, funeral parlors and chemical plants, and a preparation method of the catalyst. According to the catalyst, industrial titanium dioxide is used as acarrier, SnO2-V2O5-WO3 composite oxide is used as an active component, and La2O3, MoO3, CeO2, Nb2O5, CuO, Pr6O11 and Sb2O3 are used as auxiliaries. According to the catalyst, the active components areuniformly dispersed on the surface of the carrier under the complexing action of an organic amine, and the catalyst auxiliaries are uniformly precipitated on the surface of the carrier under the condition of ammonia water, so that the catalyst is high in specific surface area, high in thermal stability and high in chlorine poisoning resistance, can continuously operate for a long time without activation, and is low in activation temperature and high in dioxin decomposition efficiency in dioxin pollutant elimination.

The invention discloses a method for reducing the content of dioxin in capsanthin ointment. According to the method, the saponification and the solvent extraction are carried out on the commercially available capsanthin ointment to ensure that the dioxin content in capsanthin ointment products is effectively reduced and the content of capsanthin in the ointment basically remains unchanged at the same time, and therefore, the food safety is increased. The method disclosed by the invention is simple and effective and can be adapted to the requirements of industrial production.

The invention discloses a superheater for a waste heat boiler of a waste incineration system. A superheater body is arranged in a vertically arranged flue; a superheater pipeline is transversely arranged, an input end of the superheater pipeline is connected with a steam pocket, and an output end of the superheater pipeline is used for outwards outputting steam; the superheater body consists of a first superheater, a second superheater and a third superheater; an inlet header of the first superheater is connected with a saturated steam output pipeline of the steam pocket; an outlet header of the first superheater is connected with an inlet header of the second superheater through a first desuperheater; an outlet header of the second superheater is connected with an inlet header of the third superheater through a second desuperheater; and an outlet header of the third superheater is connected with a main steam pipeline. The superheater disclosed by the invention has the advantages of being capable of effectively reducing content of dioxin in flue gas, being beneficial for reducing difficulty of treating flue gas at a later period; and the superheater is energy-saving, efficient, can effectively improve thermal conversion efficiency, and ensures steam supply amount of steam power generation.