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

A method for removing elemental mercury in coal-burning flue gas. The removal is carried out in a spray absorption tower. The prepared absorbent is sprayed down from the upper part of the spray absorption tower, and the mercury introduced from the lower part of the spray absorption tower is sprayed. The coal-fired flue gas is sprayed to fully react the elemental mercury in the coal-fired flue gas with the absorbent to realize the conversion of elemental mercury to divalent mercury; the absorbent includes oxidizing additives and magnetic catalysts, oxidizing The mass ratio of the additive to the magnetic catalyst is 2 to 5:1, and the oxidizing additive is one or more combinations of potassium hydrogen persulfate, sodium persulfate, sodium perborate, and sodium percarbonate, and the catalyst It is one or more mixtures of bismuth ferrite, cobalt doped bismuth ferrite, cobalt / lanthanum doped bismuth ferrite, cobalt / strontium doped bismuth ferrite, cobalt / rubidium doped bismuth ferrite. The invention has the characteristics of high utilization rate of the absorbent, repeated use of the catalyst, no secondary pollution, simple and convenient operation, stable operation, easy handling of the product, and convenient popularization and application.

The invention provides a preparation method of a copper sulphide mercury removal agent. the preparation method comprises the following steps: mixing copper sulphide powder, a powdery carrier and an inorganic binder to form a mixture; spraying an organic binder aqueous solution into the mixture and rolling to form a ball; and drying the ball. By using copper sulphide with specific grain size and granularity as a raw material, on one hand, use of a vulcanizing agent is avoided so as to thoroughly solve problems of high toxicity, unbearable smell and residual vulcanizing agent existing in the preparation process of the copper sulphide mercury removal agent; and on the other hand, it is beneficial to increase active sites so as to make the mercury removal agent show excellent mercury removal activity. By the rolling mode, the active component is uniformly dispersed onto the surface of the carrier, and it is ensured that the mercury removal agent has a proper porous structure and as large specific surface area as possible. Thus, it helps raise mercury removal precision and mercury volume of the mercury removal agent and reduce bulk density of the mercury removal agent, and service life of the mercury removal agent is prolonged. Mercury removal cost is then reduced greatly.

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, andeach 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 an integrated adsorbent activation and spraying demercuration method which comprises the following steps: monitoring the mercury concentration of flue gas in real time by virtue of an online mercury concentration monitor (6), and dynamically regulating a second regulating valve (10) to control the injected volume and injection rate of a mercury adsorbent; dynamically regulating a third regulating valve (14) to control the injected volume and injection rate of compressed air; meanwhile, dynamically regulating a first regulating valve (7) on an online activation mechanism to control the injected volume and injection rate of an active component precursor; activating the adsorbent on line; spraying and injecting the activated adsorbent into a flue through a spraying mechanism, thereby implementing demercuration of the flue gas. According to the method, the demercuration performance of the adsorbent is optimized, active component waste is also avoided, the using amount of the adsorbent is reduced, and the demercuration cost is greatly reduced; in addition, the mercury adsorbent is activated on line in real time, and the method is adapted to frequent fluctuation of the mercury concentration.

The invention provides a visible light-based flue gas mercury removal method and a circular spraying-type mercury removal device employing the same. A reaction liquid containing a compound catalyst Ag / AgBr<1-x>I<x>-BiOBr<1-x>I<x> (x=0.6-1) is irradiated by a visible light and then releases hydroxyl radical.OH, superoxide anion radical.O2<-> and holes h<+>; the hydroxyl radical .OH, the superoxide anion radical .O2<-> and the holes h<+> have high oxidizing property; Hg<0> in the flue gas can be oxidized into Hg<2+>, so that the Hg<0> is removed in a form of the Hg<2+>, and the target of flue gas mercury removal is achieved. The mercury removal device is a circular spraying-type mercury removal device; the mercury flue gas enters from the lower part of a reactor and flows from bottom to top; a visible light source is arranged in a central quartz glass tube at the middle part of the reactor; circular spraying pipes are circularly arranged employing the central quartz glass tube as the center; the reaction liquid is sprayed towards the central quartz glass tube from the circular spraying pipes, namely the reaction liquid is sprayed from the outside to the inside; and the flue gas from which mercury is removed is discharged from a gas outlet in the top end of the reactor.

The invention belongs to the technical field of coal-fired flue gas pollutant control and discloses a renewable cyclic utilization mercury adsorbent as well as a preparation method and a regenerationmethod thereof. The mercury adsorbent is CuxMn(3-x)O4. The preparation method comprises the following steps: (1) dissolving copper substances and a chelating dispersant into deionized water to form amixed solution I, and forming chelating ions from copper ions; (2) putting dissoluble manganese substances into the mixed solution I to form a mixed solution II; (3) stirring the mixed solution II toform colloid, and drying and calcining the colloid; (4) grinding the colloid. The regeneration method comprises the following steps: (1) putting the mercury adsorbent after demercuration into a regeneration reactor; (2) introducing air flow; (3) performing condensation, and recycling monomer mercury; (4) adjusting the flow of the air flow, and regenerating activating substances on the surface of the mercury adsorbent. The mercury adsorbent provided by the invention can be recycled and regenerated, the regeneration method is simple, and the demercuration cost can be greatly reduced.

The invention discloses a filter bag / filter element for removing mercury in flue gas and a preparation method and application thereof. Needle-punched felt is used as the main base cloth, selenite is used as a selenium source, and under the action of a reducing agent, the The selenate is converted into nano selenium and carried on the felt body in situ, the felt body is vacuum-dried and then subjected to surface treatment and then dried again, and the felt body is taken out and cut and sewn to obtain a filter bag / filter element. The filter bag / filter element of the present invention has both mercury removal and dust removal functions, which can not only replace the traditional filter bag to simultaneously remove smoke dust and mercury in the temperature range of 50-200°C in the bag dust removal unit, but also can be specially used in the flue gas purification process. The mercury removal unit is used as a filter bag / cartridge for efficient mercury removal.

The invention belongs to the technical field of coal-fired flue gas purification, and in particular relates to a coal-fired flue gas powder adsorbent injection mercury removal device, which includes an adsorbent feeding part, an adsorbent powder conveying part and an adsorbent distribution injection part, wherein, The adsorbent feeding part includes a storage tank and a screw feeder; the adsorbent powder conveying part includes a frequency conversion feeder, a fan and an injector, and the ejector material is connected to the material conveying pipeline; The powder distributor is connected to several injection pipelines, and the injection pipeline is equipped with a spray gun and an intelligent flow control system. The invention can automatically and quickly adjust the dosing ratio of the powder adsorbent according to the mercury content in the flue gas, avoiding excessive or insufficient addition of the powder adsorbent, improving the effect of spraying mercury removal, reducing the waste of the powder adsorbent, and improving the The use efficiency of powder adsorbent reduces the cost of mercury removal.

The invention discloses a flue gas demercuration system and method based on the discharge and activation of halogen materials. The system comprises a pretreatment device, a dedusting device and an absorption device which are used to treat the flue gas in turn, wherein a halogen material activation device is arranged between the pretreatment device and the dedusting device, and the halogen material activation device is provided with a nozzle and a discharge reactor. The halogen material activation device injects a halogen material in the flue gas, the halogen material is activated through high voltage discharge; and after the mercury in the elementary state, of the flue gas is converted to mercury in the oxidation state and mercury in the particulate state, dedusting and absorbing are performed to remove the mercury in the oxidation state and the mercury in the particulate state. The system disclosed by the invention can effectively utilize the existing flue gas purification device to reduce the demercuration cost and increase the demercuration efficiency and the dedusting efficiency.