34results about How to "Reduce the cost of mercury removal" patented technology

The invention discloses a normal-temperature and normal-pressure preparation method and application of a metal selenide mercury adsorbent. The metal selenide mercury adsorbent is prepared at normal temperature and normal pressure by adopting a precipitation method. The metal selenide mercury adsorbent comprises a compound formed by selenium and one or more of chromium, manganese, iron, copper, cobalt, nickel, zinc, molybdenum, silver and cadmium and a composite of the compound, unstable mercury is converted into stable mercury selenide, mercury in industrial tail gas or by-products of fire coal, metallurgy, waste incineration, cement production and the like is removed, mercury enriched in mercury-containing articles for daily use is absorbed, the recovery and reutilization of mercury resources are realized, and mercury to be treated can exist in the forms of a simple substance state, a free state and/or a compound state and the like. As the metal selenide has extremely high mercury adsorption capacity and adsorption rate, realization of large-scale preparation of the metal selenide under normal temperature and pressure conditions has great significance on mercury pollution prevention and control, and the corresponding technology has wide market application prospects.

The invention discloses a method and a device for performing combined removal on boiler flue gas particulates and heavy metals. The device comprises an electrostatic precipitation area, a heavy metal catalytic oxidation area, an adsorbent injection area and a bag-type dust removal area. The method comprises the following steps: allowing boiler flue gas to pass through the electrostatic precipitation area, efficiently capturing the particulates and the particle state heavy metals such as mercury and arsenic by virtue of an electrostatic precipitator, allowing the flue gas to pass through a mercury catalytic oxidizer fixed bed, converting zero-valent mercury into divalent mercury in the flue gas, injecting activated carbon behind the catalytic oxidizer fixed bed so as to adsorb and remove the heavy metals such as mercury and arsenic, and allowing the activated carbon adsorbing the heavy metals and escaping fly ash to enter a bag area so as to be captured. Original quality coal ash is discharged by an electric area ash bucket, the activated carbon adsorbing the heavy metals and a small amount of coal ash are discharged by a bag-area ash bucket, a small amount of discharge is realized, and most of a mixture circulates to a pipeline to be injected into the flue gas to be recycled. According to the device and the method provided by the invention, the combined removal on the particulates and the heavy metals can be effectively realized, and the efficiency of removing the heavy metals in the coal-fired flue gas is greatly improved.

The invention discloses a flue gas mercury removal device, comprising a reactor casing, the lower part of which is provided with a gas inlet and the upper part of which is provided with a gas outlet. The flue gas mercury removal device is characterized in that, porous support plates at three layers are arranged between the gas inlet and the gas outlet of an inner cavity of the reactor casing, and each support plate is provided with an adsorptive filler layer. Compared with the prior art, the flue gas mercury removal device has the advantages of high mercury removal efficiency and convenient implementation cost; in addition, the porous support plates at three layers are arranged, so a temporary maintenance platform during maintenance is not required and operational maintenance staff can stand on a flue gas rectifier plate to maintain and replace internal parts, thus the device also has the advantage of convenient maintenance.

The invention discloses a coal-fired power plant smoke gas circulating adsorbent demercuration device and a demercuration method, and belongs to the technical field of smoke gas purification. Circulating demercuration adsorbent magnetic active carbon is ejected into a flue behind an air pre-heater through a gas conveying device, the magnetic active carbon adsorbs mercury in the smoke gas, and then the magnetic active carbon and ash are trapped by an electric dust remover, are screened by a multi-stage magnetic separator and enter a conical separator to finish separation of the magnetic active carbon and magnetic substances in the ash, and the recycled magnetic active carbon enters an ejecting device again; and after circulation is conducted for a certain time, the magnetic active carbon enters an adsorbent regeneration device to desorb mercury, and the regenerated magnetic active carbon enters an adsorbent ejecting system to be recycled. By the method, on the basis that coal-fired power plant smoke gas purification equipment is not changed, the mercury removing efficiency is high, the adsorbent can be recycled, the cost is reduced, and the problems about the influence of the adsorbent on the fly ash quality and secondary release of the mercury are solved.

The invention discloses a method for removing total mercury from coal burning smoke, which comprises the following steps of: mixing a lime (limestone) desulfurizing agent and a sodium sulfide mercury remover uniformly, spraying the uniformly mixed solution into a desulfurizing tower during lime (limestone)-gypsum wet smoke desulfuration, and removing the total mercury from the smoke at the same time during the lime (limestone)-gypsum wet smoke desulfuration. The method is simple and convenient to operate, does not need great reformation on the conventional desulfuration facilities, has lower mercury removal cost, and does not produce secondary pollution to the environment.

The invention provides a flue gas demercuration device and method utilizing polyvinyl chloride and boiler fly ash. The flue gas demercuration device comprises a boiler furnace, a flue and a chimney, wherein the boiler furnace, the flue and the chimney are connected in sequence, and an economizer, an air preheater, an electrostatic dust collector and a wet desulphurization tower are arranged on the flue in sequence. The flue gas demercuration device further comprises a flue gas mercury on-line monitor, a circulation flue, a crushing device, a gasification device, an air heater, a feeding device and an intelligent control device, wherein the circulation flue is arranged on the flue between the economizer and the air preheater, a discharge port of the feeding device is connected to the circulation flue, and the feeding device comprises a polyvinyl chloride waste material feeding machine and an adsorbent feeding machine. According to the flue gas demercuration device and method utilizing the polyvinyl chloride and the boiler fly ash, hydrogen chloride generated by a polyvinyl chloride waste material is used for oxidizing zero-valent mercury into gaseous divalent mercury, and then the boiler fly ash is used for adsorbing flue gas mercury. On the premise that large-scale reconstruction is not conducted on an existing pollution control device, the flue gas demercuration device and method utilizing the polyvinyl chloride and the boiler fly ash can greatly improve the demercuration effect and demercuration efficiency, thereby lowering demercuration cost, and realizing environment-friendly utilization of the polyvinyl chloride waste material.

The invention belongs to the related technical field of mercury control in coal-fired flue gas and discloses an efficient demercurating adsorbent spraying device which comprises a primary spray barrel and a cyclone, wherein an accommodating cavity is formed in the primary spray barrel, and two rows of nozzles which are arranged along two length directions of the primary spray barrel are formed in one end of a flue of the accommodating cavity, separately; the cyclone is accommodated in the accommodating cavity and is located out of the flue; air entering the accommodating cavity from one end, far from the flue, of the primary spray barrel separately forms straight flow air and spiral air through the cyclone, and the straight flow air and spiral air are used for driving an adsorbent entering the accommodating cavity to move spirally downward and the adsorbent is sprayed out from the nozzles to be mixed with flue gas for demercuration. The adsorbent spraying direction is not a single flue gas flowing direction, so that disturbance of the adsorbent is enhanced, the turbulence intensity is enhanced, the demercurating efficiency is increased, and the device is simple in structure and quiet during working.

The invention discloses a coal-fired flue gas heavy metal pollutant removal device. The device comprises multiple grilles, transparent glass, a first pipeline and a second pipeline. The multiple grilles are evenly spaced along the height direction of a chimney inside the chimney. The transparent glass is arranged to match the grilles. The transparent glass is arranged on the chimney wall above thecorresponding grilles. An inlet end of the first pipeline is connected with an outlet end of an induced draught fan, and an outlet end of the first pipeline is connected with the bottom of the chimney. An inlet end of the second pipeline is connected with an electrostatic precipitator, and an outlet end of the second pipeline is connected with an inlet end of the induced draught fan. The invention has the following beneficial effects: through full contact between visible light and the surface of a photocatalyst, catalytic efficiency is effectively enhanced; by using visible light for mercuryremoval, the mercury removal cost is reduced; and according to actual situations, an ultraviolet source is additionally arranged to further enhance the mercury removal efficiency.

The invention belongs to the relevant technical field of mercury control in coal-fired flue gas, and discloses a rotational flow mercury adsorbent injection device. The device comprises a main injection barrel and two rotational flow impellers. The main injection barrel comprises a straight line section, a nozzle and a contraction section for connecting the straight line section with the nozzle. The contraction section is in a conical shape, the opening diameter of the end, connected with the straight line section, of the contraction section is larger than the opening diameter of the end, connected with the nozzle, of the contraction section, the two rotational flow impellers are stacked to the straight line section, air entering the straight line section form direct flow air and rotational flow air after passing through the rotational flow impellers, the direct flow air and the rotational flow air are mixed to drive a mercury adsorbent entering the containing cavity to enter the contraction section and accelerated through the contraction section and then enter the nozzle, and the nozzle is used for injecting the mercury adsorbent into a flue to be mixed with smoke gas in the flue for mercury adsorption and removal. The mixed gas is accelerated through the contraction section, the contact probability of the mercury adsorbent and smoke gas is increased, and the mercury adsorption efficiency is improved.

The invention discloses a flue gas demercuration adsorbent. The adsorbent is characterized in that a method for preparing the flue gas demercuration adsorbent comprises the following steps of: mixing 10 to 25 weight percent of clay, 2 to 5 weight percent of polyethylene, 2 to 5 weight percent of rice hull, 5 to 10 weight percent of calcium oxide and the balance of pulverized fuel ash; adding water into the mixture for uniformly mixing; extruding, pelletizing and molding the mixture into particles of which the particle size is between 30 and 50 millimeters; and sintering the particles at the temperature of between 900 and 1,100 DEG C for 2 to 4 hours to obtain the flue gas demercuration adsorbent. The invention discloses the novel flue gas demercuration adsorbent. Since the pulverized fuelash is taken as a main raw material, other ingredients are only simple and conventional raw materials and a preparation method of the adsorbent is a conventional pelletizing or sintering method and the like, and the manufacturing cost of the adsorbent is lower than that of conventional adsorbents. Therefore, demercuration cost can be greatly lowered in a demercuration process.

The invention discloses a filter bag/filter element for removing mercury in flue gas and a preparation method and application thereof. The filter bag/filter element is characterized in that a needled felt serves as main base cloth, selenite serves as a selenium source, the selenite is converted into nano-selenium to be loaded on a felt body in situ under the action of a reducing agent, the felt body is subjected to surface treatment and drying again after vacuum drying, and the filter bag/filter element is obtained; and the felt body is taken out, and is cut and sewed to obtain the filter bag/filter element. The filter bag/filter element provided by the invention has mercury removal and dust removal functions, not only can replace a traditional filter bag to simultaneously remove smoke dust and mercury in a cloth bag dust removal unit in a temperature interval of 50-200 DEG C, but also can be specially used as the filter bag/filter element for efficiently removing mercury in a mercury removal unit in a flue gas purification process.

The invention discloses a modified kaolin adsorbent, and a preparation method and an application of the modified kaolin adsorbent. The adsorbent comprises the following raw materials in parts by weight: 34-42 parts of kaolin, 2-6 parts of peregal O, 5-13 parts of tannin and 13-21 parts of dipropylene glycol. The preparation method comprises the steps of mixing and grinding the kaolin and the peregal O, then adding a dipropylene glycol solution for sealing, heating and stirring, heating up, dropwise adding the tannin, performing ultrasonic treatment after cooling, stirring to dryness, and performing high temperature calcination to form the adsorbent. The adsorbent is prepared by mixing and grinding the kaolin and the peregal O and treating with dipropylene glycol and tannin; the specific surface area is increased; the adsorbent is applied to smoke mercury treatment; and the demercuration efficiency is greatly improved and reaches above 95%. The adsorbent is simple in technology, short in technical process, low in cost and convenient to popularize and use extensively, and can be recycled, and the demercuration cost can be lowered greatly.