50results about How to "Reduce desulfurization efficiency" patented technology

The invention relates to an ammonia process flue gas treatment method for acidic tail gas. The method includes the steps of: 1) controlling the sulfur dioxide concentration of tail gas entering an absorption tower at a level of less than or equal to 30000mg/Nm<3>; 2) arranging process water in an absorption tower entrance flue or in the absorption tower or cooperating with a ammonium sulphate solution to perform spray cooling; 3) disposing an oxidation section in the absorption tower, setting an oxidation distributor at the oxidation section to achieve oxidation of a desulfurized absorption liquid; 4) arranging an absorption section in the absorption tower, utilizing an absorption liquid distributor in the absorption section to realize desulfurization spray absorption by an ammonia-containing absorption liquid, which is fed through an ammonia storage groove; 5) arranging a water washing layer at an absorption section upper part in the absorption tower, washing the absorption liquid in the tail gas by the water washing layer and reducing the absorption liquid escape; and 6) setting a demister at the upper part of the water washing layer in the absorption tower to control the mist drop content in the purified tail gas. Employment of the Claus sulfur recovery and ammonia process desulfurization integrated desulfurization technology in the coal chemical industry can reduce the investment cost of after-treatment, the process can be simpler, and factory environmental protection treatment can form an intensive advantage.

The invention discloses a double-groove wet-process flue gas desulfuration device and a double-groove wet-process flue gas desulfuration method operating on the basis of two pH values, which relate to a flue gas desulfuration device and a flue gas desulfuration method. The aim of the invention is to remove SO2 from the flue gas under a high pH value condition by using desulfurating spray slurry and to dissolve limestone and oxidize calcium sulfite under a low pH value condition so as to improve desulfuration efficiency and quality of gypsum and reduce limestone consumption, investment and operation cost. In the invention, a circulating oxidization tank at the bottom of an absorption tower is divided into two parts, an oxidation pond receives desulfurizating slurry flowing out from a desulfurization tower, the oxidation pond operates in a pH range from 4.0 to 5.5, and in the oxidation pond, sulfite ions are oxidized, and byproduct of desulfuration is led out from the oxidation pond; and fresh limestone slurry is added into a circulating pond, the circulating pond operates in a pH range from 6 to 6.5, and slurry is led from the circulating pound into the absorption tower to be sprayed for deselfuration. The device and the method contribute to improving quality of gypsum, desulfuration efficiency, reducing limestone consumption and lowering investment and operation cost, and are suitable for flue gas desulfuration when sulfur coal is burnt or different kinds of fire coal are burnt.

The invention discloses a heat-conduction oil furnace of a horizontal circulating fluidized bed, and relaters to combustion equipment of the circulating fluidized bed for inferior coal, solid wastes, urban and industrial sludge and biomass fuels, in particular to a heat-conduction oil heating device. The heat-conduction oil furnace is mainly composed of a feeding device, a main combustion chamber, an auxiliary combustion chamber, an after-combustion chamber and a cyclone separator, wherein heat-conduction oil coils are arranged in the main combustion chamber and the after-combustion chamber, an economizer and an air pre-heater can be arranged behind the cyclone separator, and a waste heat boiler can also be arranged behind the cyclone separator. The heat-conduction oil heating device adopts a horizontal circulating fluidized bed technology, changes the traditional structural style adopting a chain grate furnace to heat, changes the single-stage and vertical circulating structure of the traditional fluidized bed boiler, effectively reduces the height of the boiler, and reduces the requirement on the construction height of plants. Through reasonable structural layout, the problem that the circulating fluidized bed boiler is easily abraded is effectively solved, and the heat-conduction oil heating device has wide adaptability to fuels, has high combustion efficiency, and has lower pollutant discharging quantity.

A preparation method of high sulfur capacity ferrous desulfurizer belongs to the field of coal chemical industry and preparation and application of desulfurizer, in particular to a preparation of a high temperature ferrous desulfrizer in the field of preparation and gas purification. The main active component of the desulfurizer is a nanometer frric oxide treated by a particularly technique process as that: the nanometer frric oxide is added with component such as vulcanization accelerator, carbon resistant promoter, strength enhancer and binder, then uniformly mixed by grinding and kneaded to shape, finally, dried or roasted to shape strip, granule or flake. The desulfurizer is characterized by high desulfurating efficiency, stable circulation and high sulfur capacity, etc. At least the desulfurizer removes H2S from 2000-5000ppm in entrance to 1ppm, and is suitable for removing H2S in surlfur gas of coal gas or natural gas under the temperature of 350-450 DEG C.

The invention discloses a desulfurization process of a blast furnace gas, which comprises the following steps: 1) preparing two same adsorption towers filled with molecular sieve resin, denoted as anadsorption tower A and an adsorption tower B; 2) introducing the cooled blast furnace gas into the adsorption tower A for adsorption, when the sulfur content of gas at the outlet of the adsorption tower A is more than 5 mg/m<3>, switching the blast furnace gas into an adsorption tower B for continuous adsorption, and stopping the operation of the adsorption tower A at the same time; 3) guiding outand heating a small amount of completely desulfurized coal gas, introducing the desulfurized coal gas into the adsorption tower A for high-temperature desorption regeneration, treating the gas afterthe high-temperature desorption regeneration through a recovery process of a sulfur-containing compound, and cooling the regenerated adsorption tower A for later use; and 4) alternately using the regenerated adsorption tower A and the adsorption tower B so as to complete continuous removal of the sulfur-containing compounds in the blast furnace gas. The method disclosed by the invention can realize recycling of sulfur resources, and is low in equipment investment and low in operation cost.

The invention relates to a desulfurization process, pertaining to the field of steel-smelting desulfurization technology. The technical problems the invention object to resolve is to provide a new desulfurizing agent to overcome the defect of bad desulfurization effects of the prior process. The inventive desulfurizing process includes: in the furnace tapping process, adding 55-65% of desulfurizing agent in the iron melt groove, after the tapping of the iron melt, in the desulfuration platform, mixing in the iron melt tank and adding 35-45% of the desulfurization agent. The inventive desulfurizing process can resolve the problem of ultrahigh sulfur content in the cast iron, wherein, the maximum desulfurization efficiency is 98%.

The invention discloses a composite desulfurizer for molten iron desulphurization or semisteel desulphurization and a process method thereof and belongs to the technical field of metallurgical production. According to the composite desulfurizer for molten iron desulphurization or semisteel desulphurization and the process method thereof, during desulphurization, the iron loss is little, efficiency is high, and the steelmaking steel grade smelting need can be met. The composite desulfurizer is a powder mixture at least comprising CaO, Mg, Na2O, CaC2, Al, Al2O3 and SiO2. The process method comprises the step that the composite desulfurizer of the components is injected to the lower-middle portion of molten iron needing to be desulphurized or the lower-middle portion of semisteel needing to be desulphurized along with nitrogen through a nitrogen conveying pipeline.

The invention relates to the field of environmental protection and discloses a three-cycle desulphurization method for wet type ammonia-process desulphurization. The desulphurization method is implemented with a first slurry circulating loop, a second slurry circulating loop and a third slurry circulating loop, wherein in the first slurry circulating loop, slurry having mass concentration of 10%-20% and a pH value of 4.0-5.0 is used for carrying out cycle spraying treatment on flue gas, and the temperature of the flue gas treated by the slurry is 50-60 DEG C; in the second slurry circulating loop, slurry having mass concentration of 10%-15% and a pH value of 5.0-6.0 is used for carrying out cycle spraying treatment on the flue gas; and in the third slurry circulating loop, slurry having mass concentration of 3%-10% is used for carrying out cycle spraying treatment on the flue gas. The invention also discloses a flue gas desulfurization tower or system using the three-cycle desulphurization method. According to the three-cycle desulphurization method, the three independent circulating loops are divided according to the concentration of the slurry, the circulating loops separately control the slurry having different concentrations and pH values for treatment of the flue gas, and the contradiction of high desulphurization efficiency and high oxygenation efficiency of by-products is solved.

The invention discloses a compound molten iron desulfurizer, which mainly comprises (by weight percent) active lime 60-75, calcium aluminate 5-8, inactivated 4-10, metallic aluminum 5-10, calcium fluoride 4-7, and balancing foreign matter. The desulfurizing agent has low cost and good sulfur removal effect.

The invention relates to an ultra-low emission type desulfurization and dust removal rotational flow tray jet tower. The ultra-low emission type desulfurization and dust removal rotational flow tray jet tower comprises a desulfurization tower, wherein a sprinkling system is located on the lower portion of the desulfurization tower, a demister is located on the upper portion of the desulfurization tower, a size rotational flow tray mixer is arranged between the sprinkling system and the demister and located in a rotational flow tray mixer liquid storage tank, the size rotational flow tray mixer comprises a standpipe and a bubble cap, and the standpipe is covered with the bubble cap; multiple tray holes are formed in a tray of the size rotational flow tray mixer. The four desulfurization techniques including sprinkling, rotational flow, tray and bubbling are combined, the characteristics that the rotational flow tray can be used for uniform mixing and a bubbling technique absorbent is of a continuous phase and can achieve deep desulfurization are utilized, and deep desulfurization and deep dust removal are achieved. When the concentration of flue gas SO2 at an inlet of an absorption tower is below 10000 mg/Nm3, the requirement for ultra-low emission that the concentration of SO2 at an outlet is smaller than 35 mg/Nm3 can be met.

The invention relates to a calcium base desulfurater primary and secondary content and impurity elements simultaneous determination method, including the following steps: a calcium base desulfurater analysis sample is quantitatively weighed by a 180-200 mesh analysis sieve, a multi-step microwave digestion method is adopted for carrying out high temperature high pressure mixed acid microwave digestion on the quantitative calcium base desulfurater analysis sample, wherein the mixed acid is 2ml concentrated hydrochloric acid and 4-6ml concentrated nitric acid and the microwave digestion includes three steps, the sample after digestion is transferred for constant volume to prepare analysis solution, namely 2% dilute nitric acid is used for transferring the solution in the digestion inner pipe into a 25-50ml volumetric flask for constant volume to scale; and full spectrum direct-reading plasma emission spectrometer is used for accurately determining contents of multiple elements in the analysis solution. The invention not only can fast and accurately determine primary and secondary content and content of multiple elements in the calcium base desulfurater but also is applicable to determination of multiple elements in grout during desulfuration.

A semi-dry flue gas desulfurization device and method, belonging to the technical field of flue gas desulfurization equipment and methods. The technical solution is: a desulfurization tower ash discharge valve is added at the bottom of the desulfurization tower. During the desulfurization process, the desulfurization tower ash discharge valve at the bottom of the desulfurization tower flue chamber is closed to prevent cold air from entering the desulfurization tower. The working load of the booster fan, and ensure the stability of humidity and flue gas temperature in the desulfurization tower, so the ambient temperature and flue gas temperature have no effect on desulfurization. Due to the stable humidity and flue gas temperature in the tower, it avoids the sticking of the tower and the clogging of the dust bag during spraying, and the desulfurization cost is low and the desulfurization efficiency is high. At the same time, the ash in the circulating ash bin of the present invention enters the Venturi chamber through the circulating ash conveying pipe. When the flue gas flow rate at the entrance of the desulfurization tower is large, part of the flue gas is sealed in the lower part of the Venturi chamber 3 by the ash discharge valve of the circulating ash bin. To support the returning ash, prevent falling, avoid environmental pollution, reduce production costs, and have significant economic and social benefits.