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

The invention relates to fluidized bed plasma garbage-gasifying equipment and a gasifying process thereof. A gasifying furnace of the gasifying equipment is a plasma gasifying fluidized bed. The gasifying equipment comprises a fluidized bed gasifying furnace, wherein a plasma torque is arranged at a smoke outlet at the top of the fluidized bed; the inner layer of the wall of the fluidized bed gasifying furnace is a corundum cast material layer; an ash plasma processing cabin is arranged on the tail part of a slag discharging system; and the inner layer of the fluidized bed gasifying furnace is a corundum cast material layer. The gasifying process comprises the following steps of: (a) generating mixed gas; (b) discharging slag and returning the materials; and (c) purifying and filtering gas. In the process, the mixed gas generated in the fluidized bed furnace is re-heated to more than 1,000 DEG C through plasma to perform tar recombination and eliminate dioxin on the surface of a part of ash, and the mixed gas is cooled from 800 DEG C to 180 DEG C within 0.6 second under the action of quenching, so a re-polymerization interval of the dioxin is completely avoided. The fluidized bed plasma garbage-gasifying equipment has the characteristics of harmlessness, environment friendliness, energy conservation and consumption reduction.

The invention discloses a method for treating household garbage, which comprises a pre-treating step, a plastic product treating step, a sand treating step and a combustible material treating step, wherein, according to the method, the household garbage is divided into five kinds of material, namely ferromagnetic material, plastic products, sands, light combustible material and kitchen waste; the five kinds of material are used for manufacturing wood-plastic boards, bricks and generating electricity by gasification and the like, respectively; the method disclosed by the invention has the advantages of simple operation, strong practicability, high automatic degree, safe and controllable use; a circular fluidized bed with relatively high gasification efficiency is used for light combustible material and kitchen waste treatment; the circular utilization degree of the household garbage such as gasified mixing gas treatment and the like except dioxin is increased; secondary pollution is avoided; and the method can be widely suitable for household garbage treatment of all scales.

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 screw propelling type solid waste continuous carbonization equipment and a continuous carbonization method. The screw propelling type solid waste continuous carbonization equipment is characterized by comprising a feeding system, a material distributing system, a carbonization system, a product collecting system and a discharging system which are successively connected with one another, wherein a sealed connected screw propelling material channel is formed from a feeding opening of the feeding system to a discharging opening of the discharging system; and the carbonization system is connected with a deodorization system. The feeding system comprises a feeding screw conveyer, a feeding gear motor, a first stirring motor and the feeding opening, the feeding opening of the feeding system is an inverted-cone-shaped feeding hopper, the first stirring motor drives a stirring shaft to rotate, blades are mounted on the stirring shaft, and the stirring shaft is positioned in the inverted-cone-shaped feeding hopper of the feeding system. The screw propelling type solid waste continuous carbonization equipment is high in universality, the generated carbonization products are used extensively, and secondary pollution is avoided. The screw propelling type solid waste continuous carbonization equipment is reasonable and compact in structure, good in airtightness, relatively low in manufacturing cost, high in degree of automation and high in working efficiency.

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 relates to the technical field of environmental protection, in particular to a novel fly ash efficient resource utilization system and method.The method comprises the steps that fly ash is subjected to heat treatment, and a fly ash product obtained after heat treatment is mixed with slag and desulfurized gypsum to prepare a solid waste-based cementing material. The novel fly ash efficient resource utilization system comprises a back-mixing pyrolysis reactor, a preheater, a feeding bin, a mixing bin, a gas purification system, a finished product bin, a solid waste-based cementing material mixing device, a solid waste-based cementing material preparation device and a solid waste-based cementing material finished product bin. The invention provides a novel fly ash efficient resource utilization system which can greatly improve the cracking efficiency of organic compounds, reduce equipment faults, reduce the occupied area of equipment, thoroughly solve the problem of non-uniform local pyrolysis caused by non-uniform heating of materials, greatly reduce energy consumption and prolong the service life of the equipment.

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.

The invention discloses a handling method for lowering dioxins and the dust content in industrial flue gas by a control wet method. By automatically controlling heating of the flue gas, the flue gas reaches and is kept in the temperature interval of 750 DEG C to 850 DEG C, the dioxins in the flue gas can be further eliminated by the temperature interval, meanwhile, through quenching of a quench tower, the cooling water spray volume is automatically controlled so as to lower the temperature of the flue gas to 200 DEG C to 250 DEG C within 2.5 s, the temperature interval can inhibit production of the dioxins, and finally, the content of the dioxins in the flue gas is greatly lowered.

The invention discloses a method and equipment for reducing dioxin in smoke emitted in waste incineration. The method comprises the following steps: (1) reducing the temperature of the smoke to 450 to800 DEG C by adopting first afterheat recycling equipment, and treating the smoke by using the first afterheat recycling equipment to obtain first smoke; (2) filtering the first smoke at a temperature larger than or equal to 350 DEG C by adopting first filtration equipment, and making the first smoke pass through a filter material of the first filtration equipment to obtain second smoke of whichthe flying dust content is smaller than or equal to 20 mg/Nm<3>; and (3) reducing the temperature of the second smoke to 200 DEG C or below 200 DEG C by adopting second afterheat recycling equipment,and treating the second smoke by using the second afterheat recycling equipment to obtain exhaust smoke which can be directly exhausted, wherein the filter material of the first filtration equipment is a sheet composed of a metal porous material which takes a metal element of solid solution alloy and a face-centered cubic structure or the metal element of a body-centered cubic structure as a matrix phase.

The invention discloses a circuit board smelting organic tail gas treatment system which comprises a smelting unit, a waste heat unit, a cooling unit, an activated carbon ejector, a cloth bag dust removal device, a desulfurization absorption tower and a secondary denitration unit, the waste heat unit comprises a waste heat boiler, and the cooling unit comprises a spray cooler and a temperature monitor; the waste heat boiler, the spray cooler, the activated carbon ejector, the cloth bag dust removal device, the desulfurization absorption tower, the heat exchanger and the secondary denitration unit are sequentially communicated in the flowing direction of tail gas generated by the smelting unit, and the tail gas reaching the standard is discharged from a gas outlet of the secondary denitration unit. The temperature of the tail gas at the smelting furnace, the CO concentration at the waste heat boiler and the nitrogen oxide content at the denitration spray gun are monitored and adjusted in real time, and rapid cooling of the spray cooler is matched, so that the dioxin content in the tail gas after circuit board smelting is remarkably reduced, and the treated tail gas meets the emission standard.

The invention relates to the field of waste incineration, and particularly discloses a waste incineration treatment process which comprises the following steps: waste incineration: performing waste incineration, and introducing oxygen in the incineration process; after the incineration flue gas is adsorbed by activated carbon and sprayed and deacidified by lime slurry, discharged flue gas and incineration fly ash are obtained; the incineration fly ash and a treatment agent are mixed and stirred under the condition of a mercury lamp or ultraviolet light, then a binding material is added, finally, water is added for stirring, building blocks are formed, and a solidified body is obtained; wherein the treatment agent is prepared by mixing the following raw materials in parts by weight: 15-25 parts of a chelating agent, 6-15 parts of hydrotalcite, 5-12 parts of nano titanium dioxide and 28-35 parts of graphene oxide loaded biochar. The device has the advantage that heavy metal and dioxin in the fly ash generated by waste incineration can be more effectively treated.