CN208512263U - A kind of lead-zinc smelting flue gas depth mercury removal device - Google Patents

Abstract

The utility model discloses a kind of lead-zinc smelting flue gas depth mercury removal devices, the device includes demercuration tower and its external circulating system, demercuration tower is in inside setting flase floor and packing layer and lower jet pipe etc., lead-zinc smelting flue gas and demercuration slurries can be realized into foamed haptoreaction, realize that mercury metal is removed in depth in lead-zinc smelting flue gas, pass through setting external circulating system simultaneously, realize that demercuration slurries absorb the circulated sprinkling of lead-zinc smelting flue gas, substantially increase the utilization rate and demercuration efficiency of demercuration slurries, and mercury removal device structure design is simple, the demercuration material cost of use is lower, demercuration efficiency is high, and recyclable heavy metal Hg, it is without secondary pollution, it can be with large-scale use.

Description

A kind of lead-zinc smelting flue gas depth mercury removal device

Technical field

The utility model relates to a kind of mercury removal device, in particular to heavy metal Hg is removed in depth in a kind of lead-zinc smelting flue gas Device belongs to waste gas purification Treatment process field.

Background technique

Mercury metal is a kind of pair of environment, a kind of highly harmful Main Heavy Metal of biology including humans One of, can accumulate in vivo, the mankind except can directly by its contamination hazard in addition to, can also by food chain it is such as edible by The harm of mercury pollution poisoning is received between the biology such as fish stained to mercury, the main harm on human body is to influence human body cranial nerve System, therefore prevention and improvement to heavy metal Hg pollution, are an important environmental protection subjects.

The method for removing heavy metal Hg in removing exhaust gas at present is to carry out physisorphtion using active carbon, also first passes through washing Mercury in exhaust gas is washed into liquid, then with active carbon carries out physical absorption or using chemical reagent such as vulcanized sodium, organic sulfur, expensive The method that metal etc. is chemically reacted removes mercury.It is active carbon using the main shortcoming of active carbon physisorphtion Limited sorption capacity, general mercury quantity of adsorbing only account for 2% or so of adsorbent own wt, and Adsorption effect is not satisfactory.Change Method removes heavy metal Hg, and there are processing costs to be affected by chemical agent raw material, and the heavy metal precipitation object formed is difficult to It is separated from washes, operating process is cumbersome and is difficult to reach ideal effect etc..Such as Chinese utility model (CN205145917U) a kind of system of flue gas demercuration is disclosed, is inhaled by connected flue gas temperature controlling instruments, dust-extraction unit and mercury Attached tower is constituted, which first passes through physical filtering mode and tentatively remove particulate matter in flue gas, while removing the mercury in particulate matter, keeps away Exempt to influence adsorption efficiency on adsorbent after particulate matter is adsorbed in；In demercuration, flue gas is made to pass through adsorbent by certain flow The gold of gold-plated quartz sand, mercury and adsorbent surface forms amalgam, thus by the fixed mercury removed in flue gas on the sorbent of mercury, it The mercury of absorption is released by heating gold-plated quartz sand afterwards and does later use.The device uses expensive noble metal as mercury Adsorbent, and need to consume a large amount of electric energy, higher cost.As Chinese utility model (CN206229181U) discloses a kind of cigarette Qi exhaustion mercury system, including flue, air-introduced machine, heater, active carbon layer and deduster, deduster are mounted on flue, for catching Collect the flying dust in flue；The flue of the outlet end of the entrance and deduster of air-introduced machine is connected to, the outlet of air-introduced machine and active carbon layer Entrance connection, air-introduced machine by after dedusting flue gas introduce active carbon layer react, generate elemental sulfur；Heater is to active carbon Layer is heated, and is heated to elemental sulfur, is made elemental sulfur by thermal evaporation；The outlet of active carbon layer and the entrance of the deduster The flue at end is connected to, and the elemental sulfur after gasification enters flue by the pipeline under the action of flue gas.Reactor is to active carbon It is heated, the SO in flue gas₂Elemental sulfur is converted into during contacting with active carbon after heating, elemental sulfur is distributed in flue gas In, enter in flue with flue gas, reacted with the mercury in flue gas, generate mercuric sulphide, is trapped and remove by deduster.The device utilizes cigarette Sulphur dioxide reduction in gas recycles the Elemental Mercury in elemental sulfur capture flue gas, the plant energy consumption is big, and utilizes at elemental sulfur The reaction efficiency that elemental sulfur captures mercury is low.

Utility model content

It is deposited for existing using the device and technique of physics and chemical method removing lead-zinc smelting heavy metal in flue gas mercury Defect, the purpose of this utility model is to provide a kind of design of structure is simple, removing heavy metal Hg is high-efficient, removes more thorough Bottom, it is without secondary pollution, and the mercury removal device of recyclable mercury resource, it can be with large-scale use.

In order to achieve the above technical purposes, the utility model provides a kind of lead-zinc smelting flue gas depth mercury removal device, Including demercuration tower and its external circulating system；The demercuration tower includes lower shell and upper shell；The top of the upper shell is equipped with Gas outlet, the middle part that the middle part in upper shell is equipped in flase floor III or upper shell are successively arranged III He of flase floor from the bottom to top Demisting foam layer, the bottom of upper shell and the top of lower shell connect；Top in the lower shell is successively arranged lattice from the bottom to top Screen I, packing layer and flase floor II are equipped with lower jet pipe above the flase floor II；Middle and lower part in lower shell is equipped with air inlet, Bottom in lower shell is equipped with liquid outlet；The external circulating system includes circulating pump, and circulating pump passes through circulating line and lower cylinder The liquid outlet of body bottom and the lower jet pipe connection on lower shell top.

Preferred scheme, the bottom of the upper shell and the top of lower shell are integral by flanged joint.

The main body of more preferably scheme, the upper shell is cylindrical structure, and upper and lower ends port is pyramidal structure, upper cylinder The main diameter of body is greater than the main diameter of lower shell.The solids that section by expanding upper shell is conducive to entrainment is heavy Drop.

The main body of more preferably scheme, the lower shell is cylindrical structure, and lower end port is pyramidal structure.Lower end port is set The solids that being set to pyramidal structure can be effectively prevented in demercuration slurries settles.

The pyramidal structure top of more preferably scheme, lower shell is liquid outlet, and recoil is equipped on the conical surface of pyramidal structure Wash mouth.By being passed through gas or liquid recoils from backwash mouth, the solids for being deposited in demercuration tower bottom can be made clear It removes.

The lower part of preferred scheme, the lower shell is equipped with fluid infusion I and overflow port, the level height of the fluid infusion I Higher than overflow port, and it is lower than air inlet.

Preferred scheme, the lower shell inside are filled with demercuration slurries；The packed height of the demercuration slurries is lower than benefit Liquid mouth I is higher than overflow port.The demercuration slurries newly prepared enter inside demercuration tower from fluid infusion, and Adsorption of Mercury reaches the demercuration of saturation Slurries are discharged from overflow port or leakage fluid dram.

Preferred scheme, the circulating pump are equipped with fluid infusion II on import circulating line, and outlet circulating line is equipped with Leakage fluid dram.

The side of preferred scheme, the upper shell is equipped with manhole II, and lower shell side is successively arranged manhole from top to bottom I, manhole III and manhole IV.Manhole I~IV is respectively used to the maintenance of demercuration tower different parts.

Preferred scheme, described filler layer are plastic hollow ball or plastics Raschig ring.Ball filler is conducive to improve gas-liquid Contact area and time improve absorption efficiency.

The lower part of preferred scheme, lower shell is equipped with upper and lower liquidometer mouth, can install liquidometer to monitor in demercuration tower Demercuration slurries amount.

Demisting foam layer is plastic wire reticular structure (if can preferentially be not provided with removing when not influencing actual effect in the utility model Mist layer).

The demercuration slurries used in utility model device mainly include macromolecule demercuration material, this material hydrophilic It is good, and to the large amount of adsorption of heavy metal Hg, average adsorption mercury quantity generally can reach macromolecule demercuration material own wt 10~ 50%.Macromolecule demercuration material is the melamine class macromolecule in disclosed Chinese patent application (CN2016105694959) Material (such as 1 structure of following formula).Its absorption principle is to apply the physical-chemical reaction process such as absorption and chelating, by heavy metal Hg and height Molecule demercuration material is firmly combined together, and adsorbing and removing heavy metal Hg is more thorough.Macromolecule demercuration material is in acid, alkaline solution In it is with good stability, thus for macromolecule demercuration material regeneration and recycling and recycle mercury resource create it is good Good basic condition.The mode that pyrogenic process refining mercury can also be directlyed adopt recycles mercury, recycling mercury resource mode it is more flexible with it is practical.High score Sub- demercuration material can also cooperate the Containing Sulfurs such as organic sulfur, vulcanized sodium, NaHS, sustained release vulcanizing agent, modified sulfur-bearing active carbon Object is closed as mercury removal agent.The dissolution dispersion of these mercury removal agents obtains demercuration slurries in the solution.

Demercuration tower lower shell lower part is additionally provided with spare mouth in the utility model.Spare mouth is common setting, can be used for facing When adapter tube removed for liquid in demercuration tower or input liquid etc..

Demercuration tower upper shell is equipped with above the packing layer on side wall and mends feeding port in the utility model, for adding or taking out Filler.

Lower jet pipe uses barrel forms in the utility model, installs convenient for integral demounting.

Demercuration tower top can be effectively prevented flue gas by setting demisting foam layer and carry demercuration slurries secretly in the utility model Demercuration tower out causes the invalid loss of mercury removal agent slurries.

The mercury removal device of the utility model (preferentially selects plastic hollow by setting plastic hollow ball or Raschig ring filler layer Ball) it improves the contact area of demercuration slurries and flue gas and extends contact time.

The demisting foam layer that the mercury removal device of the utility model uses is plastic material mesh-like material.

Flase floor in the mercury removal device of the utility model is plastics, glass reinforced plastic or metal material.It has been support that it, which is acted on, Fixed function, while having the effect of uniformly distributed dispersing fluid concurrently.Increase the turbulent extent of gas-liquid phase fluid, increases flue gas and mercury removal agent The contact probability of slurries and time improve the efficiency of demercuration reaction.

Mercury removal device provided by the utility model is used for the process of lead-zinc smelting flue gas depth demercuration are as follows: lead-zinc smelting flue gas Entering in demercuration tower from the air inlet of demercuration tower lower part, flue gas first passes through the packing layer of supportive grid and its top from bottom to top, The more uniformly distributed dispersion in packing layer of gas and the demercuration slurries to gush out from upper subordinate, improves the contact of flue gas and demercuration slurry It area and extends contact time, the mercury metal in flue gas is removed in depth, finally, processing qualification reaches the purified gas of discharge standard It is exported outside discharge mercury removal device from demercuration tower.It is equipped with circulating pump outside demercuration tower, realizes demercuration slurries to mercury metal in flue gas Cyclic absorption improves the utilization efficiency of demercuration slurries.

Compared with the prior art, technical solution of the present invention bring advantageous effects:

1) mercury removal device structure design provided by the utility model is simple, and it is efficiently thorough that the mercury metal in flue gas may be implemented Bottom removes, and fume treatment qualification reaches discharge standard after demercuration.

2) mercury removal device provided by the utility model, can be by flue gas even distribution point by design plastic hollow ball packing layer It dissipates, while by the abundant mist of demercuration slurries, sufficiently extend demercuration slurries to the soak time of flue gas and increases contact area, reach The purpose of remaining mercury into thorough removing flue gas.

3) flue gas can be effectively prevented by demercuration slurries by setting demisting foam layer in mercury removal device provided by the utility model It is entrained with demercuration tower, causes the invalid loss of demercuration slurries, improves the utilization rate of demercuration slurries.

4) it is equipped with Multi-layer lattice screen in mercury removal device provided by the utility model, is not only played very to filler, except mist etc. Good support fixed function, and gas and liquid can be played and be evenly distributed with peptizaiton well, increase gas-liquid phase fluid Turbulent extent improves contact probability and the time of flue gas and mercury removal agent slurries, achievees the purpose that depth demercuration.

5) there is mercury removal device provided by the utility model external circulating system can be greatly improved by endless form Removal efficiency of the demercuration slurries to mercury in mercury fume.

6) macromolecule demercuration material, organic sulfur, vulcanized sodium, sulphur hydrogenation can be used in mercury removal device provided by the utility model The sulfur-containing compounds such as sodium, sustained release vulcanizing agent, modified sulfur-bearing active carbon or macromolecule demercuration material compound organic sulfur, vulcanized sodium, sulphur The sulfur-containing compounds such as sodium hydride, sustained release vulcanizing agent, modified sulfur-bearing active carbon carry out demercuration to mercurous flue gas during smelting as mercury removal agent, These medicaments are the universal products in the market, and cost is not high, have good cost performance, especially macromolecule demercuration material to a huge sum of money Belong to the large amount of adsorption of mercury, average adsorption mercury quantity generally can reach the 10~50% of macromolecule demercuration material own wt, and acid, It is with good stability in alkaline solution, thus for macromolecule demercuration material regeneration and recycling and recycle mercury resource Create good basic condition, macromolecule demercuration material to physical-chemical reaction process such as the absorption of heavy metal Hg and chelatings, Heavy metal Hg and macromolecule demercuration material are firmly combined together, adsorbing and removing heavy metal Hg is more thorough.It is de- using macromolecule After mercury material Adsorption of Mercury, mercury can be recycled in such a way that pyrogenic process refines mercury, recycling mercury resource mode it is more flexible with it is practical.

In conclusion the utility model has good economic value and social value, application easy to spread.

Detailed description of the invention

[Fig. 1] is the mercury removal device structural schematic diagram of the utility model:

Wherein, 1 is liquid outlet, and 2 be backwash mouth, and 3 be lower shell, and 4 be overflow port, and 5 be spare mouth, and 6 be air inlet, 7 It is packing layer for flase floor I, 8,9 is mend feeding port, and 10 be flase floor II, and 11 be manhole I, and 12 be upper shell, and 13 be flase floor III, 14 be demisting foam layer, and 15 be gas outlet, and 16 be manhole II, and 17 be lower jet pipe, and 18 be manhole III, and 19 be fluid infusion I, and 20 are Manhole IV, 21 be upper and lower liquidometer mouth, and 22 be fluid infusion II, and 23 be circulating pump, and 24 be leakage fluid dram.

Specific embodiment

The utility model structure is described in further detail with reference to the accompanying drawing, rather than limits the utility model right It is required that protection scope.

Mercury removal device provided by the utility model is as shown in Figure 1.Mercury removal device mainly includes outside demercuration tower and demercuration tower The circulatory system.The demercuration tower includes lower shell 3 and upper shell 12, and the main part of upper shell is cylindrical structure, upper end port It is pyramidal structure with lower end port, the top of upper end port pyramidal structure is gas outlet 15, and lower end port pyramidal structure passes through It links into an integrated entity at the top of flange and lower shell.Middle part is equipped with flase floor III 13 in the upper shell, can root on flase floor III It is arranged or is not provided with demisting foam layer 14 according to needs.Flase floor III plays the role of supporting demisting foam layer, while also functioning to and centainly disappearing The effect of foam-expelling, demisting foam layer are mainly used for retaining the mist of flue gas entrainment, prevent the loss of demercuration slurries.The master of upper shell Body diameter is greater than the main diameter of lower shell, and the solids that the section by expanding upper shell is conducive to entrainment settles.On The top of cylinder is additionally provided with manhole II 16, the maintenance being mainly used for inside upper shell.The main body of the lower shell is cylinder knot Structure, lower end port are pyramidal structure.Pass through flanged joint with the bottom port of upper shell at the top of the cylindrical structure of the lower shell, Top in lower shell is successively arranged flase floor I7, packing layer 8 and flase floor II 10 from the bottom to top, and flase floor I plays support and fills out The effect of the bed of material, while playing the role of distributing gas, packing layer 8 is hollow plastic ball, and demercuration can be improved in hollow plastic ball It the contact area of slurries and flue gas and extends contact time, and flase floor II primarily serves the effect of distribution liquid, therefore grid Plate I, packing layer and flase floor II act synergistically, and gas-liquid is evenly distributed with foamed, greatly improve demercuration slurries to golden in mercury fume Belong to the absorption of mercury.Lower jet pipe 17 is equipped with above the flase floor II, lower jet pipe is mainly downward, i.e., sprays high pressure to packing layer direction Demercuration slurries.The top of lower shell, which is equipped with, mends feeding port 9, is mainly used for filler supply.The top of lower shell is additionally provided with manhole III 18, the maintenance on the top for lower shell.Middle and lower part in lower shell is equipped with air inlet 6.Lower part in lower shell is equipped with fluid infusion Mouth I19 and overflow port 4, the fluid infusion I level height is higher than overflow port, and is arranged lower than air inlet, inside the lower shell Filled with demercuration slurries；The demercuration slurries packed height is lower than fluid infusion I, is higher than overflow port.The demercuration slurries newly prepared from Fluid infusion enters inside demercuration tower, and the demercuration slurries that Adsorption of Mercury reaches saturation can be discharged from overflow port or leakage fluid dram.Lower shell Lower end port is pyramidal structure, is liquid outlet 1 at the top of pyramidal structure, backwash mouth 2 is equipped on the conical surface of pyramidal structure.Pass through Gas is passed through from backwash mouth or liquid is backwashed, and the solids for being deposited in demercuration tower bottom can be made to remove.Lower cylinder Body sidewall is equipped with manhole IV 20, is mainly used for the maintenance of lower shell lower part.Lower shell lower part is additionally provided with liquidometer mouth 21 up and down, The level condition of lower shell is observed by setting liquidometer.The circulatory system includes circulating pump 23, and circulating pump passes through circulation Pipeline is connect with the lower jet pipe of the liquid outlet of demercuration tower lower shell bottom and demercuration tower lower shell cylinder top；And pump inlet Pipeline is equipped with fluid infusion II 22, and circulating-pump outlet pipeline is equipped with leakage fluid dram 24；The demercuration slurries newly prepared are from fluid infusion II Enter demercuration tower by circulating pump and connecting pipe, the demercuration slurries that Adsorption of Mercury reaches saturation are discharged from leakage fluid dram, are able to maintain Demercuration slurries demercuration ability with higher in demercuration tower.

Lead-zinc smelting flue gas enters in demercuration tower from the air inlet of demercuration tower lower part, and flue gas first passes through support lattice from bottom to top Grid and its packing layer of top, gas and the mercury removal agent slurries more uniformly distributed dispersion in packing layer gushed out from upper subordinate, It improves the contact area of flue gas and demercuration slurry and extends contact time, the mercury metal in flue gas is removed in depth, finally, processing The purified gas that qualification reaches discharge standard exports outside discharge mercury removal device from demercuration tower.

Embodiment 1

The present embodiment uses lead-zinc smelting flue gas depth mercury removal device, is main with macromolecule demercuration material compounding organic sulfur Absorption and chelate Adsorption of Mercury material, specifically includes the following steps:

(1) mercury content to be processed is no more than 5.0mg/m³Lead-zinc smelting flue gas introduces in demercuration tower, with certain mass The macromolecule demercuration material circulation slurries of concentration 18% carry out gas-liquid contact and absorption and chelatropic reaction occur, by heavy metal Hg and height Molecule demercuration material is firmly combined together, and demercuration rate is 98% or more.

It (2), will a huge sum of money using macromolecule demercuration material to the physical-chemical reaction process such as the absorption of heavy metal Hg and chelating Belong to mercury to be firmly combined together with macromolecule demercuration material.

(3) mercury content after removing heavy metal Hg is had reached into 0.05mg/m³Qualified purified gas is from demercuration top of tower gas Outlet is expelled to outside battery limit (BL).

Claims (10)

1. a kind of lead-zinc smelting flue gas depth mercury removal device, it is characterised in that:

Including demercuration tower and its external circulating system；

The demercuration tower includes lower shell (3) and upper shell (12)；

The top of the upper shell is equipped with gas outlet (15), and the middle part in upper shell is equipped in flase floor III (13) or upper shell Middle part be successively arranged flase floor III (13) and demisting foam layer (14) from the bottom to top, connect at the top of the bottom of upper shell and lower shell It connects；

Top in the lower shell is successively arranged flase floor I (7), packing layer (8) and flase floor II (10) from the bottom to top, described Lower jet pipe (17) are equipped with above flase floor II；

Middle and lower part in lower shell is equipped with air inlet (6), and the bottom of lower shell is equipped with liquid outlet (1)；

The external circulating system includes circulating pump (23), circulating pump by the liquid outlet of circulating line and lower shell bottom and under The lower jet pipe on cylinder top connects.

2. a kind of lead-zinc smelting flue gas depth mercury removal device according to claim 1, it is characterised in that: the upper shell Bottom and the top of lower shell are integral by flanged joint.

3. a kind of lead-zinc smelting flue gas depth mercury removal device according to claim 2, it is characterised in that: the upper shell Main body is cylindrical structure, and the port of upper and lower ends is pyramidal structure, and the main body that the main diameter of upper shell is greater than lower shell is straight Diameter.

4. a kind of lead-zinc smelting flue gas depth mercury removal device according to claim 2, it is characterised in that: the lower shell Main body is cylindrical structure, and lower end port is pyramidal structure.

5. a kind of lead-zinc smelting flue gas depth mercury removal device according to claim 4, it is characterised in that: the taper of lower shell Structural top is liquid outlet, and backwash mouth (2) is equipped on the conical surface of pyramidal structure.

6. a kind of lead-zinc smelting flue gas depth mercury removal device according to claim 1, it is characterised in that: the lower shell Lower part is equipped with fluid infusion I (19) and overflow port (4), and the level height of the fluid infusion I is higher than overflow port, and is lower than air inlet.

7. a kind of lead-zinc smelting flue gas depth mercury removal device according to claim 1 or 6, it is characterised in that: the lower cylinder Internal portion is filled with demercuration slurries；The demercuration slurries packed height is lower than fluid infusion I, is higher than overflow port.

8. a kind of lead-zinc smelting flue gas depth mercury removal device according to claim 1, it is characterised in that: circulating pump into Mouth circulating line is equipped with fluid infusion II (22), and outlet circulating line is equipped with leakage fluid dram (24).

9. a kind of lead-zinc smelting flue gas depth mercury removal device according to claim 1, it is characterised in that: the upper shell Side is equipped with manhole II (16), and lower shell side is successively arranged manhole I (11), manhole III (18) and manhole IV from top to bottom (20)。

10. a kind of lead-zinc smelting flue gas depth mercury removal device according to claim 1, it is characterised in that: described filler layer For plastic hollow ball or plastics Raschig ring.