5301 results about "Flue-gas desulfurization" patented technology

A method of treating a coal combustion flue gas, which includes injecting a molecular halogen or thermolabile molecular halogen precursor able to decompose to form molecular halogen at flue gas temperature. The molecular halogen coverts elemental mercury to mercuric halide adsorbable by alkaline solids such as subbituminous or lignite coal ash, alkali fused bituminous coal ash capturable in whole or part by electrostatic precipitators (ESPs), baghouses (BHs), fabric filters (FFs), dry flue gas desulphurization solids, with or without subsequent adsorption by a liquid such as a flue gas desulphurization scrubbing liquor.

The invention discloses a method for using flue gas desulfurization gypsum to prepare calcium sulfate whisker, comprising process steps of size mixing, high-temperature crystallization, drying and coating, etc. The method utilizes the flue gas desulfurization gypsum as the raw material, which has low production cost, short technological process and saves natural gypsum mine and effectively relieves the environmental pollution problem of the flue gas desulfurization gypsum. The product purity can be up to more than 98 percent, which can be used as filler with medium intensity or as friction material, building material or insulating material, and the like, instead of asbestos. The product can also partly replace organic macromolecular compounds such as glass fiber, resin, rubber and plastic, and the like, and has good describability.

The invention belongs to the technical field of flue gas purification equipment and discloses a low-sulfur flue gas desulfurization and denitrification apparatus, comprising an adsorbing column and avibrating screen; the adsorbing column is provided with a first region, a second region and a third region sequentially along a flow gas circulation direction; the first region is provided with a fluegas incoming port and an ammonia spray grille arranged at the flue gas inlet; the third region is provided with a flue gas outlet; the second region is provided with a mobile activated carbon layer inside; the activated carbon layer flows in from a top inlet of the adsorbing column and flows out of a bottom outlet; the vibrating screen is connected with the bottom outlet of the adsorbing column and is connected with the top inlet of the adsorbing column through a delivery mechanism. The low-sulfur flue gas desulfurization and denitrification apparatus has the main advantages that an activatedcarbon resolution device is provided, the adsorbing column structure is selectively designed according to the characteristics of flue gas, activated carbon suitable for direct reuse is screened and separated in conjunction with the vibrating screen, efficient deep denitrification is provided for the flue gas with relatively low content of sulfur, no dependence on resolution procedures occurs, theprocess is simple, the controllability is high, and great convenience and high efficiency are achieved.

The invention discloses a spray evaporation treatment method of the wet method flue gas desulfurization wastewater in a thermal power station. In the method, an atomizing nozzle is arranged in the region with the temperature at 413-470 K and the flue gas speed of 5-11 m/s in a flue of the boiler tail part; desulfurization wastewater is pumped by utilizing a water pump, air is compressed by a compressor, and the pressure ratio of the compressed air to the desulfurization wastewater entering into the atomizing nozzle is 0.25-0.6; the speed of liquid droplets atomized by the atomizing nozzle is 50-80 m/s, and particle diameters of the liquid droplets are less than 50 mu m; and the liquid droplets are evaporated and then exhausted out of a chimney together with the flue gas. The invention can save chemical drugs utilized in the conventional wastewater treatment method; overcome the defects of many apparatuses, large investment, high running cost and heavy apparatus repair and maintenance load of a wastewater treatment system in the prior art, overcome the great corrosion influence of chlorine ions in water meta-acidity environment, reduce the specific resistance of ashes in a dust collector and improve the dust collector efficiency through increasing the flue gas humidity and properly lowering the flue gas temperature.

Process for producing sodium bicarbonate for purifying flue gases, according to which an aqueous solution containing sodium sulfate is subjected to electrodialysis to produce a sodium hydroxide solution and a sodium bisulfate solution, the sodium hydroxide solution being carbonated in order to obtain sodium bicarbonate.

The invention discloses a sintering flue gas desulfurization cycle enrichment methods and device, the described method from the sintering machine take part gas return to the top of sintering machine sealed enclosures within cycle, while complementing sintering machine burning need oxygen, the remaining part of the flue gas discharge after desulfurization. In devices, including dedusting device of flue gases between the chimney and flue, in the road before the desulfurization setup a branch pipeline to connect sintering machine sealed enclosures, in the branches of pipe setup cycle fan and supplement device. This invention due to sintered exhaust gas partly return to the seal trolley of sintering machine to reduce the displacement of gas, thereby reducing the total of dust and exhaust gas, while the SO2 of the sintering process play a enrichment role, to increase desulfurization efficiency, and reduce release total of burning exhaust gas, reducing the processing load of desulfurization device.

The invention relates to a loading activated carbon and ití»s preparing method. The invention uses activated carbon as carrier and the additive components are loaded on the activated carrier via immersion method, while the additive components is distributed over most surfaces of pore passages of said activated carbon, and the additive components is 0.01-50% of absorbent. The invention is prepared via the immersion method which is processed in the temperature higher than room temperature. The invention can overcome the defect of present technique by which additive components can not be distributed over most pore passages; therefore, it can improve the availability ratio of activated carbon and the application property. In addition, according to the difference of said additive components and their contents, the invention can apply the processes of gas desulfurization, flue gas desulfurization, and exhaust gas purification.

The invention relates to a method for carrying out desalination and zero-discharge processing of power plant desulphurization wastewater by adopting an electrodialysis technology. The method comprises the following steps: neutralizing, precipitating, coagulating and filtering the power plant desulphurization wastewater and removing CODs (Chemical Oxygen Demands), heavy metals, F-ions, gypsum, silicon dioxide, hydroxide of iron and aluminum and other insoluble particles in waste water; separating C1-ions and other monovalent ions in clear liquid from SO3<2->, SO4<2-> and other divalent ions through nanofiltration; desalinating and concentrating water produced by the nanofiltration by adopting a multistage countercurrent reverse electrodialysis method. The method has the advantages that the concentration of the Cl-ions in nanofiltration concentrated water and electrodialysis freshwater generated by the method is lower, and the nanofiltration concentrated water and the electrodialysis freshwater can be returned for flue gas desulfurization; the content of NaCl in a small amount of electrodialysis concentrated water produced reaches above 12 percent, the bivalent ions and other impurities are removed by nanofiltration, and the electrodialysis concentrated water is further evaporated and concentrated, so that chlorine-alkali industry electrolytes and NaCl salt can be obtained. Through the method, the zero-discharge treatment and the resource utilization of the desulfurization wastewater can be realized.

The invention discloses a control method for aerosol in flue gas desulfurization by utilizing an ammonia method and a master desulfurizing tower, and the control method is characterized in that flue gas enters the master desulfurizing tower after being cooled to the relative humidity of 90 to 100% and the temperature of 60 to 80 DEG C through high-pressure waster mist or prewashing temperature reduction; the generation of the aerosol particles in the desulfurization by utilizing the ammonia method is reduced by optimizing desulfurization operating conditions, and the formed aerosol particles are condensed to grow big and are partially washed to be eliminated through a desulfurizing solution; an appropriate amount of steam is injected into the saturated flue gas through desulfurizing and eliminating the partial aerosol particles; the oversaturated water vapor environment required by the secondary condensation and the growth of the aerosol particles is established on the top of the master desulfurizing tower; and the condensed and the grown aerosol particles are eliminated through a high-efficiency demister. The invention combines the formation mechanism of the aerosol in the flue gas desulfurization by utilizing the ammonia method; and the formation of the aerosol is reduced by optimizing the process conditions of the desulfurization operation and the elimination of the formed aerosol is promoted by utilizing a steam phase change principle at the same time so that the exhaust problem of the aerosol in the flue gas desulfurization by utilizing the ammonia method can be effectively solved.

The invention discloses a treatment method of sintering flue gas desulphurization wastewater, which completes the treatment on the sintering flue gas desulphurization wastewater through the following five steps of: 1. neutralization and coagulation: regulating the pH value of the sintering flue gas desulphurization wastewater to 8.5 to 9.5 by lye, and adding 0 to 200ppm of coagulating agents; 2. flocculation: adding 0 to 10ppm of coagulant aids for forming flocs; 3. precipitation and filter liquor separation; 4. biochemical treatment on filter liquor; and 5. deep treatment. The treatment method can be used for reducing the treatment cost of the desulphurization wastewater without generating influence on other treatment systems, thereby having good application and popularization prospects.

A fuel is produced from bitumen by precipitating a substantial portion of asphaltenes from bitumen by contacting the bitumen with a lower alkane solvent. Suitable burners include a fluidized bed boiler, a circulating fluidized bed boiler and a pitch boiler which utilize either pre-combustion sulfur sorbents or post-combustion flue gas desulfurization. The sulfur in emissions can be used to produce sulfuric acid. The process uses a low cost fuel, generates steam, power and sulfuric acid and meets all emission requirements for SO_2, NO_x and PM.

The invention relates to a reproduction method for sodium-base flue gas desulfurization liquid, which is characterized in that the flue gas desulfurization liquid containing sodium sulphite and sodium bisulfite is oxidized to a solution containing sodium sulfate, the solution containing sodium sulfate is electrolyzed to a sodium hydroxide solution and a sulfuric acid solution by using bipolar membrane electrodialysis. According to the invention, the electrolytic conversion rate of sodium sulfate can reach more than 90%, the obtained sodium hydroxide solution can be used as absorption liquid for a flue gas desulfurization tower, the sulfuric acid by-product is produced simultaneously. By-product sulfuric acid can be used as sulfuric acid for treating high hardness and high alkalinity. The reproduction method for sodium-base flue gas desulfurization liquid is capable of achieving the purposes of strong brine zero-draining, comprehensive resource utilization and cost reduction.

A catalytic cracking fume desulfuration wastewater treatment process is characterized in that wastewater is discharged to a slurry pool and is mixed with a flocculating agent, a stirrer is used for stirring the wastewater and the flocculating agent, the wastewater and the flocculating agent are mixed evenly, the wastewater after being mixed is discharged to an expansion tube type filter and is subjected to the coagulation reaction at the lower end of the expansion tube type filter, small particulate matters in the wastewater are flocculated, large flocculating bodies are formed, the solid-liquid separation is achieved through the filtration of a filtering film, thick slag and supernatant fluid are obtained, the supernatant fluid is discharged to an oxidation tank further, the thick slag is subjected to back washing and enters a subsequent filtering box, the thick slag is concentrated and dewatered in the filtering box, mud cakes which are concentrated are transported outwards, the water of dehydration returns to the slurry pool again, is mixed with the wastewater and is processed again, the false chemical oxygen demand (COD) which contains sulfite and bisulfite is oxidized and removed by the supernatant fluid in the oxidation tank, and the sewage which meets standards is discharged. Compared with the prior art, the process has the advantages that the area occupied by devices is small, the operation cost is low, the solid and the liquid can be separated completely, the working environment of workers is good, device parameters can be set in accordance with parameters of different materials, and the application is wide.

The invention provides a process for removing smoke dust by wet ammonia flue gas desulphurization. The smoke dust removing process comprises two processes, namely, smoke dust removal and ammonium sulfate post-treatment, wherein the ammonium sulfate post-treatment process is that desulfurated ammonium sulfate slurry which is generated by a desulphurization system is delivered to a cyclone separator, a lower overflow vent of the cyclone separator is connected with the inlet of a centrifugal machine, and a solid outlet of the centrifugal machine is connected with a drier; and the smoke dust removing process is that liquid of an upper overflow vent of the cyclone separator and a liquid outlet of the centrifugal machine are connected with filtering separation equipment, and liquid enters a recirculating tank or a liquid tank for next circulation after dust in the liquid is removed by the filtering separation equipment. A device for removing dust by wet ammonia desulphurization comprises the cyclone separator, a centrifugal machine, the drier, the filtering separation equipment, an ash settling pond, a circulating tank or the liquid tank with a stirring device, is used for combining theammonium sulfate post-treatment and dust removal, and has simple process and system, small occupied area and low operation cost.

The invention discloses a method for treating desulfurization ash. The method comprises the following steps of: mixing the desulfurization ash generated by a dry/semidry desulphurization process and limestone powder, which serve as raw materials of a desulfurizer in a wet flue gas desulfurization process, according to a proportion; uniformly stirring the desulfurizer and pumping the desulfurizer into a slurry pond of an absorption tower; adding a catalyst into the slurry pond; introducing oxidation air into the slurry pond; introducing flue gas into the slurry pond through a flue; reacting the desulfurizer with SO2 in the flue gas under the action of the oxidation air and the catalyst; controlling the pH value of the slurry in the absorption tower, the slurry temperature, the content of solid matters contained in the slurry and the retention time of the desulfurizer in the slurry pond; after the reaction is completed, performing vortex concentration and vacuum filtration to obtain a gypsum by-product; and adding wastewater produced in the process into a process water collection box for recycling. The method is simple, is easy to realize, has remarkable effect, provides a safe and proper treatment way for the dry/semidry desulfurization ash and has good economic and social benefits.

The invention relates to a device and a method for removing sulfur dioxide and dioxin from sintering flue gas. The lower part of an absorption tower of the device has a Venturi structure; a Venturi shrinkage section is provided with a desulfurizing agent inlet and a circulating ash inlet; a Venturi expansion section is provided with a water spray nozzle; the upper middle part of the absorption tower is provided with an active carbon/coke nozzle and a conical component is arranged opposite to the nozzle; the upper part; the upper part of the absorption tower is provided with a flue gas outlet which is connected with a radially arranged cyclone separator; a hoper at the lower end of the cyclone separator is provided with two outlets, one outlet is connected with an ash bin, and the other outlet is connected with a circulating ash inlet through a spiral return device; a gas outlet on the top of the cyclone separator is communicated with an inlet of a deduster; and a gas outlet of the deduster is connected with a chimney. The sintering flue gas containing SO2 and dioxin enters the absorption tower through the Venturi, and is mixed with slaked lime Ca(OH)2, atomized water and active carbon/coke, which are sprayed in the absorption tower, the Ca(OH)2 absorbs the SO2 under the action of the atomized water and the active carbon/coke absorbs the dioxin to cooperatively remove the two pollutants.

The invention relates to a kind of wet-form stack-gas desulfurizing industrial art monitoring and auto-control system, which can be used in desulfurizing industrial art by spraying lime powder or size mixture of lime to stack gases in order to forming high purity gypsum. The hardware of the invention contains industrial cybertron, PLC, group of server, router, Internet system and remote terminal. And the feature of it is that it contains the subsystems as follows: the monitoring and data acquisition subsystem, which includes the intelligence instrument; the simulated instrument and the observation system of the air pollutant that is CEMS; the data processing and electrical control system, which controls the on-the-spot actuating mechanism by PLC; the network and data communication subsystem and the safety control subsystem, which include the safety emergency power supply and the control cabinet on the spot of the subject equipment. The industrial cybertron works for data processing and central control, which uses PLC to control spot actuating mechanism, and it can manifest the data of equipment state at the right moment and can type all kinds of report form, in order to realize auto-control and remote control at the right moment.

A method and apparatus for reducing mercury in industrial gases such as the flue gas produced by the combustion of fossil fuels such as coal adds hydrogen sulfide to the flue gas in or just before a scrubber of the industrial process which contains the wet scrubber. The method and apparatus of the present invention is applicable to installations employing either wet or dry scrubber flue gas desulfurization systems. The present invention uses kraft green liquor as a source for hydrogen sulfide and/or the injection of mineral acids into the green liquor to release vaporous hydrogen sulfide in order to form mercury sulfide solids.