CN103071375B - Smoke demercuration device and smoke demercuration method - Google Patents

Smoke demercuration device and smoke demercuration method Download PDF

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CN103071375B
CN103071375B CN201310048201.4A CN201310048201A CN103071375B CN 103071375 B CN103071375 B CN 103071375B CN 201310048201 A CN201310048201 A CN 201310048201A CN 103071375 B CN103071375 B CN 103071375B
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demercuration
smoke
reaction tower
outlet
pipeline
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CN103071375A (en
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李剑胜
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Zhuzhou Sante Environmental Protection And Energy Saving Co Ltd
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Zhuzhou Sante Environmental Protection And Energy Saving Co Ltd
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Abstract

The invention provides a smoke demercuration device which comprises a reaction tower, a solid-liquid separator and a chlorine control system, wherein an oxidation device, a filling layer, a spraying device and a demister are arranged in the reaction tower; a smoke inlet and a smoke outlet are arranged on the reaction tower; the smoke inlet is located between the oxidation device and the filling layer; the smoke outlet is located at the top of the reaction tower; a solution outlet is arranged at the bottom of the reaction tower; the oxidation device is of funnel shape and comprises an upper opening tapered barrel and a lower cylindrical barrel having an integrated structure; the lower cylindrical barrel of the oxidation device is communicated with the chlorine control system; the solution outlet at the bottom of the reaction tower is respectively connected with the spraying device and the solid-liquid separator through a first pipeline; a supernate outlet and a sediment outlet are arranged at the bottom of the solid-liquid separator; and the supernate outlet is connected with the bottom of the reaction tower through a second pipeline. The invention also provides a method for adopting the smoke demercuration device for performing the smoke demercuration. The smoke demercuration device and method provided by the invention can effectively remove the mercury from the smoke and can increase the recovery rate of the mercury.

Description

A kind of method of smoke demercuration device and flue gas demercuration
Technical field
The invention belongs to metal smelt and thermal power generation flue gas demercuration technical field, be specifically related to a kind of method of smoke demercuration device and flue gas demercuration.
Background technology
Mercury (Mercury, Hg) is commonly called as " mercury ", is a kind of poisonous, nonessential heavy metal element of organism.After the fifties in 19th century Japan's minamata disease event, mercury pollution starts the concern causing environmental science circle.Because mercury can exist and long-distance migration in an atmosphere, be defined as global contaminant.At present, permitted in polymetallic concentrate or raw material all containing trace or a small amount of mercury, in high temperature (> 800 DEG C) smelting process, mercury in the ore of more than 90% and concentrate can be transformed into mercury metal steam and enter in flue gas, wherein part mercury meeting condensation, or regroup with other compositions in flue gas, form water-fast compound.Before flue gas enters sulfuric acid plant, this mercurial soot particle or mercury compound can be separated in conventional gas purification and cooling device; But still have a considerable amount of mercuryvapour can be cooled and cleaning system by conventional gas with metallic vapour form.If do not taken further measures, this part mercuryvapour will be trapped by sulfuric acid or discharge from tail gas, thus pollute finished product sulfuric acid or from tail gas, be disposed to contaminated environment in air.Therefore, in order to protection of the environment and acquisition high-quality sulfuric acid, must the mercury in baking flue gas be reclaimed.
Occur following several to the method that flue gas carries out demercuration in prior art, such as condensation method, iodide process, sulfuric acid process, chloridising etc.; Although most method can reach satisfied demercuration effect, construction investment is large, technical sophistication, and operation easier is large, and operating cost is high makes it be difficult to be widely applied.At present, at zinc abstraction industry flue gas demercuration many employings chlorination process, send into washing demercuration tower by flue gas, at the HgCl of Ta Nei and spray 2solution countercurrent washing, thus make mercury vapour in flue gas by HgCl 2solution oxide generates Hg 2cl 2precipitation; The part Hg that then also can will generate 2cl 2precipitation Cl 2oxidation, regeneration HgCl 2solution recycles as cleaning solution.But this chloridising demercuration method and washing off loading are put still exists following defect in actual applications:
1, Hg 2cl 2the reaction unit that arranges outward at scrubbing tower of oxidizing process in carry out, realize this process need and set up independent Cl 2, not only there is potential environmental risk in insulating space, more improves the difficulty of operation and management, too increase construction cost and the floor space of system.
2, Hg 2cl 2with cleaning solution in systemic circulation process, separate and subside facility efficiency is not high, causes it not to be separated timely and effectively; Meanwhile, Hg 2cl 2separate and subside facility need have larger volume, causes the cumulative volume of liquid in system to increase, causes HgCl 2useful effect loss increase, the use amount of chlorine improves, and causes cost greatly to increase.
3, exhanst gas outlet demist weak effect, causes equipment to occur carrying phenomenon secretly, and system bulk is uneven, even occurs that volume reduces, not only can not the removal of mercury, is also taken away by the mercury in circulation fluid, system can not normally be run.
Summary of the invention
The invention solves the above-mentioned technical problem existed in prior art, and propose a kind of new smoke demercuration device and adopt this equipment to carry out the method for flue gas demercuration, its safer, environmental protection in actual applications, efficient, operation is more simple, and operating cost is lower.
Particularly, technical scheme of the present invention is:
A kind of smoke demercuration device, described smoke demercuration device comprises reaction tower, solid-liquid separator and chlorine control system;
Oxidation unit, packing layer, spray equipment, demister is provided with successively from bottom to up in described reaction tower; Described reaction tower is provided with smoke inlet and exhanst gas outlet, and wherein smoke inlet is between oxidation unit and packing layer, and exhanst gas outlet is positioned at the top of reaction tower; The bottom of described reaction tower is provided with taphole; Described oxidation unit is infundibulate, comprises open topped taper cone barrel and the lower cylindrical cylinder of integrative-structure; The lower cylindrical cylinder of described oxidation unit is communicated with chlorine control system;
Taphole bottom described reaction tower is connected with spray equipment, solid-liquid separator respectively by the first pipeline; The bottom of described solid-liquid separator is provided with supernatant outlet and precipitation outlet, and described supernatant outlet is connected with the bottom of reaction tower by second pipe.
As a further improvement on the present invention, described first pipeline has three laterals, and wherein the first lateral is connected with spray equipment, and the second lateral is connected with the top of solid-liquid separator, and Three branched pipe road is connected with bottom reaction tower.
As a further improvement on the present invention, described first pipeline is provided with pump.
As a further improvement on the present invention, described solid-liquid separator is also connected with the 3rd pipeline near its top place, and the other end of the 3rd pipeline is connected with the bottom of reaction tower.
As a further improvement on the present invention, described smoke demercuration device also comprises reduction cell; Described first pipeline also has the 4th lateral, and the other end of described 4th lateral is connected with described reduction cell.
As a further improvement on the present invention, described reduction cell top has reducing agent entrance, and bottom is provided with calogreen outlet, and reduction cell is also provided with liquid outlet.
As a further improvement on the present invention, the material of described packing layer is polypropylene or polyvinyl chloride.
Present invention also offers a kind of method of flue gas demercuration, the method of described flue gas demercuration adopts smoke demercuration device provided by the invention to carry out, comprise the following steps: in the smoke inlet of reaction tower, pass into the flue gas treating demercuration, and cleaning solution is passed in spray equipment, start chlorine control system simultaneously, can flue gas after exhanst gas outlet collects demercuration.
As a further improvement on the present invention, described smoke demercuration device also comprises reduction cell, and the method for described flue gas demercuration also comprises the step passing into reducing agent in reduction cell.
As a further improvement on the present invention, described cleaning solution is mercuric chloride solution, and described reducing agent is zinc powder or iron powder.
Smoke demercuration device provided by the invention, comprise the reaction tower integrating washing and oxidative function, therefore without the need to setting up independently oxidation reaction insulating space again, eliminate the environmental risk that chlorine causes, make to wash simultaneously, the contact path of oxidizing process Raw is shorter, improve washing and oxidation efficiency; In addition, oxidation unit is infundibulate, effectively can improve oxidation efficiency; Be provided with demister at reaction tower top simultaneously, can effectively prevent equipment from occurring carrying phenomenon secretly; In addition, smoke demercuration device provided by the invention is also provided with solid-liquid separator, can by Hg 2cl 2timely and effective separation, reduces HgCl 2loss and chlorine consumption, thus effectively reduce costs.Adopt smoke demercuration device provided by the invention to carry out flue gas demercuration, effectively can remove the mercury in flue gas, the rate of recovery of mercury can also be improved.
Accompanying drawing explanation
Fig. 1 is the structural representation of smoke demercuration device provided by the invention.
In figure, 100---reaction tower, 200---solid-liquid separator, 300---chlorine control system, 400---reduction cell;
11---oxidation unit, 12---packing layer, 13---spray equipment, 14---demister; 101---smoke inlet, 102---exhanst gas outlet, 103---taphole; 111---open topped taper cone barrel, 112---lower cylindrical cylinder; 201---precipitation outlet; 401---reducing agent entrance, 402---calogreen exports, and 403---liquid outlet;
G1---the first pipeline, g2---second pipe, g3---the 3rd pipeline, g10---pump, g11---the first lateral, g12---the second lateral, g13---Three branched pipe road, g14---the 4th lateral.
Detailed description of the invention
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As described in Figure 1, the invention provides a kind of smoke demercuration device, comprise reaction tower 100, solid-liquid separator 200 and chlorine control system 300.Wherein, oxidation unit 11, packing layer 12, spray equipment 13, demister 14 is provided with from bottom to up successively in reaction tower 100.Reaction tower 100 is also provided with smoke inlet 101 and exhanst gas outlet 102, wherein smoke inlet 101 is between oxidation unit 11 and packing layer 12, and exhanst gas outlet 102 is positioned at the top of reaction tower 100.The bottom of reaction tower 100 is provided with taphole 103.
Wherein, packing layer 12 is for increasing the contact area of cleaning solution and flue gas.The filler loaded in described packing layer can select polypropylene or polyvinyl chloride material, but is not limited to this.Spray equipment 13, for spraying cleaning solution, makes flue gas and cleaning solution counter current contacting wash, the mercury vapour in flue gas is oxidized to Hg 2cl 2precipitation, makes its (namely at oxidation unit 11 place) sedimentation enrichment bottom reaction tower 100.
In the present invention, the Hg of described oxidation unit 11 for generating after washing 2cl 2be oxidized to HgCl 2.For guaranteeing that reaction zone has enough Hg 2cl 2for oxidation, described oxidation unit 11 is infundibulate, comprises open topped taper cone barrel 111 and the lower cylindrical cylinder 112 of integrative-structure.Wherein, lower cylindrical cylinder 112 can enrichment Hg 2cl 2post.In the present invention, the lower cylindrical cylinder 112 of oxidation unit 11 is communicated with chlorine control system 300, therefore by chlorine control system 300 carry chlorine by the Hg of enrichment in lower cylindrical cylinder 112 2cl 2carry out fully oxidized.Wherein, the amount of chlorine passed in the unit interval suitably adjusts by the content detecting mercury chloride in solid-liquid separator 200 supernatant.The HgCl generated after oxidation 2be subject to Hg in oxidation unit 11 simultaneously 2cl 2the gravity compressing of post, and the washing away of mixed solution of input in Three branched pipe road g13, and flow fast at the bottom of tower.
What cleaning solution and oxidation generated afterwards contains HgCl 2mixed solution can in the bottom enrichment of reaction tower 100.Therefore, in the present invention, the taphole 103 bottom reaction tower 100 is connected with spray equipment 13, solid-liquid separator 200 respectively by the first pipeline g1.As shown in Figure 1, described first pipeline g1 has three laterals, and wherein the first lateral g11 is connected with spray equipment 13, and the second lateral g12 is connected with the top of solid-liquid separator 200, and Three branched pipe road g13 is connected with bottom reaction tower 100.Therefore, the solution at the bottom of tower can be delivered to respectively bottom spray equipment 13, reaction tower 100 and solid-liquid separator 200.Under preferable case, pump g10 can be set on the first pipeline g1.
Flue gas after demercuration is discharged from the exhanst gas outlet 102 at reaction tower 100 top.In the present invention, be also provided with demister 14 at reaction tower 100 inner top, this demister 14 can improve mist eliminating efficiency, improves the demercuration efficiency of flue gas further.In the present invention, the various demisters that described demister 14 can adopt those skilled in the art to commonly use, such as, can adopt fiber mist eliminator, but be not limited to this.
The bottom of described solid-liquid separator 200 is provided with supernatant outlet and precipitation outlet 201, and wherein supernatant outlet is for separating of HgCl 2solution, and Hg 2cl 2precipitation is then collected from precipitation outlet 201.The supernatant obtained after solid-liquid separator 200 is separated can be used as cleaning solution and sends back in reaction tower 100, and therefore, the supernatant outlet of solid-liquid separator 200 is connected with the bottom of reaction tower 100 by second pipe g2.As a kind of preferred embodiment of the present invention, solid-liquid separator 200 is also connected with the 3rd pipeline g3 near its top place, and the other end of the 3rd pipeline g3 is connected with the bottom of reaction tower 100.The Main Function of the 3rd pipeline g3 prevents Hg in solid-liquid separator 200 2cl 2the deposition of precipitation, plays stirring action, allows the chlorine energy sufficient reacting passed into.
As a kind of preferred embodiment of the present invention, described smoke demercuration device also comprises reduction cell 400.Accordingly, the first pipeline g1 is also provided with the 4th lateral g14, the other end of described 4th lateral g14 is connected with described reduction cell 400, thus the solvent portions bottom reaction tower 100 can be delivered in reduction cell 400.The top of described reduction cell 400 has reducing agent entrance 401, and bottom is provided with calogreen outlet 402, and reduction cell is also provided with liquid outlet 403.By passing into reducing agent in reduction cell 400, mixed solution can be reduced, the supernatant after reduction treatment purifying exports from liquid outlet 403, and isolated Hg 2cl 2precipitation is then collected from the calogreen of bottom outlet 402 and stores.
Present invention also offers a kind of method of flue gas demercuration, the method of described flue gas demercuration adopts smoke demercuration device provided by the invention to carry out, comprise the following steps: in the smoke inlet 101 of reaction tower 100, pass into the flue gas treating demercuration, and cleaning solution is passed in spray equipment 13, start chlorine control system 300 simultaneously, can flue gas after exhanst gas outlet 102 collects demercuration.Meanwhile, also can pass into reducing agent in the reducing agent entrance 401 of reduction cell 400, reduction treatment is carried out in part shunting in the mixed solution bottom reaction tower.In the present invention, described cleaning solution is mercury chloride (HgCl 2) solution, described reducing agent is zinc powder or iron powder.
Embodiment 1
Adopt the smoke demercuration device shown in Fig. 1, demercuration process is carried out to sulfur dioxide flue gas in Making Acid in Zhuzhou Smelter process.System acceptance exhaust gas volumn is 70000 ~ 80000Nm3/h, flue gas is 30 ~ 50mg/Nm3 containing Hg amount, SO2 concentration is 6 ~ 7%, flue gas carries out entering described smoke demercuration device after purified treatment through wet-type electrostatic defroster, control temperature is 35 ~ 40 DEG C, after treatment from exhanst gas outlet collect purification after flue gas containing Hg amount be 0.05 ~ 0.18mg/Nm 3, the finished product sulfuric acid of production is mercurous is 0.00008 ~ 0.00035%, is better than top grade finished acid standard.
Embodiment 2
Adopt the smoke demercuration device shown in Fig. 1, flue gas demercuration process is carried out to lead sintering sulphur dioxide flue gas acid preparing process.System acceptance exhaust gas volumn is 80000 ~ 95000Nm 3/ h, flue gas is 40 ~ 60mg/Nm containing Hg amount 3, SO 2concentration is 2 ~ 3%, and temperature is 30 ~ 35 DEG C, after treatment from exhanst gas outlet collect purification after flue gas containing Hg amount be 0.05 ~ 0.15mg/Nm 3, the finished product sulfuric acid of production is mercurous is better than national top grade finished acid standard.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.

Claims (9)

1. a smoke demercuration device, is characterized in that, described smoke demercuration device comprises reaction tower, solid-liquid separator and chlorine control system;
Oxidation unit, packing layer, spray equipment, demister is provided with successively from bottom to up in described reaction tower; Described reaction tower is provided with smoke inlet and exhanst gas outlet, and wherein smoke inlet is between oxidation unit and packing layer, and exhanst gas outlet is positioned at the top of reaction tower; The bottom of described reaction tower is provided with taphole; Described oxidation unit is infundibulate, comprises open topped taper cone barrel and the lower cylindrical cylinder of integrative-structure; The lower cylindrical cylinder of described oxidation unit is communicated with chlorine control system;
Taphole bottom described reaction tower is connected with spray equipment, solid-liquid separator respectively by the first pipeline; The bottom of described solid-liquid separator is provided with supernatant outlet and precipitation outlet, and described supernatant outlet is connected with the bottom of reaction tower by second pipe;
Described first pipeline has three laterals, and wherein the first lateral is connected with spray equipment, and the second lateral is connected with the top of solid-liquid separator, and Three branched pipe road is connected with bottom reaction tower.
2. smoke demercuration device according to claim 1, is characterized in that, described first pipeline is provided with pump.
3. smoke demercuration device according to claim 1, is characterized in that, described solid-liquid separator is also connected with the 3rd pipeline near its top place, and the other end of the 3rd pipeline is connected with the bottom of reaction tower.
4. smoke demercuration device according to claim 1, is characterized in that, described smoke demercuration device also comprises reduction cell; Described first pipeline also has the 4th lateral, and the other end of described 4th lateral is connected with described reduction cell.
5. smoke demercuration device according to claim 4, is characterized in that, described reduction cell top has reducing agent entrance, and bottom is provided with calogreen outlet, and reduction cell is also provided with liquid outlet.
6. smoke demercuration device according to claim 1, is characterized in that, the material of described packing layer is polypropylene or polyvinyl chloride.
7. the method for a flue gas demercuration, it is characterized in that, the method of described flue gas demercuration adopts the smoke demercuration device described in any one of claim 1-6 to carry out, comprise the following steps: in the smoke inlet of reaction tower, pass into the flue gas treating demercuration, and cleaning solution is passed in spray equipment, start chlorine control system simultaneously, can flue gas after exhanst gas outlet collects demercuration.
8. method according to claim 7, is characterized in that, described smoke demercuration device also comprises reduction cell, and the method for described flue gas demercuration also comprises the step adding reducing agent in reduction cell.
9. method according to claim 8, is characterized in that, described cleaning solution is mercuric chloride solution, and described reducing agent is zinc powder or iron powder.
CN201310048201.4A 2013-02-07 2013-02-07 Smoke demercuration device and smoke demercuration method Active CN103071375B (en)

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CN103423757B (en) * 2013-07-31 2016-12-28 华北电力大学(保定) A kind of device and method utilizing polrvinyl chloride and boiler fly ash to carry out flue gas demercuration
CN107487888A (en) * 2017-08-18 2017-12-19 西北矿冶研究院 A kind of mercury removal agent and demercuration method

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SE9701947L (en) * 1997-05-26 1998-05-04 Boliden Contech Ab Process for separating gaseous elemental mercury from a gas
US6638347B2 (en) * 1999-09-29 2003-10-28 Merck & Co., Inc. Carbon-based adsorption powder containing cupric chloride
CN100496672C (en) * 2007-04-30 2009-06-10 武汉凯迪电力环保有限公司 Wet flue gas desulfurizing and hydrargyrum-removing technology based on two-stage oxidation reaction and system thereof
CN102824845A (en) * 2012-09-13 2012-12-19 华北电力大学(保定) Method and system for utilizing white mud to remove mercury of biomass combustion boiler smoke
CN203183904U (en) * 2013-02-07 2013-09-11 株洲三特环保节能有限公司 Smoke mercury removal equipment

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