CN106439842A - Removal device and method for mercury in mercury-containing pollutant - Google Patents

Removal device and method for mercury in mercury-containing pollutant Download PDF

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Publication number
CN106439842A
CN106439842A CN201610792669.8A CN201610792669A CN106439842A CN 106439842 A CN106439842 A CN 106439842A CN 201610792669 A CN201610792669 A CN 201610792669A CN 106439842 A CN106439842 A CN 106439842A
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China
Prior art keywords
flue gas
rotary kiln
mercury
temperature
mercurous
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CN201610792669.8A
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CN106439842B (en
Inventor
张涛
姬成岗
王金华
王统
涂学炎
毕廷涛
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Yunnan Institute Of Environmental Science (kunming China International Research Center For Plateau-Lake)
Yunnan Whole Week Environmental Technology Co ltd
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YUNNAN INSTITUTE OF ENVIRONMENTAL SCIENCE
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • F23G5/04—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment drying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/0407—Constructional details of adsorbing systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/64—Heavy metals or compounds thereof, e.g. mercury
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • F23G5/027—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment pyrolising or gasifying stage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/44—Details; Accessories
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/102—Carbon

Abstract

The invention belongs to the technical field of solid waste treatment, and particularly relates to a removal device and method for mercury in a mercury-containing pollutant. The removal device for the mercury in the mercury-containing pollutant consists of a material preparing system, a pre-heating drying system, a thermal desorption system, a residue cooling conveying system and a flue gas purifying system. The removal method for mercury in the mercury-containing pollutant comprises the following steps of: pre-treating, pre-heating and drying, desorbing and mercury-removing, mercury-containing flue gas purifying. According to the removal device and the removal method, mercury resources further can be recycled while pollutant treatment is realized, so that materials can be sufficiently reacted, and therefore, a reaction rate is increased; the whole system adopts sealed treatment, so that mercury-containing flue gas does not leak in a reaction process, and therefore, safety is improved; energy consumption needed for heating and drying cold flue gas is reduced, and energy consumption needed for cooling high-temperature flue gas is also reduced, so that production cost is greatly reduced; the production process is guaranteed to be safe and controllable; and process flow is shortened, and energy consumption is reduced.

Description

The removing means of mercury and method in a kind of mercurous pollutant
Technical field
The invention belongs to field of solid waste treating technology, be specifically related to the removing means of mercury in a kind of mercurous pollutant And method.
Background technology
Mercury is a kind of argenteous liquid metals, and under normal temperature, volatility is very big, and aerial saturated concentration is up to 3.52 ～29.5mg/m3.Owing to mercury has some special physics, chemical properties, so being widely applied to chemical industry and petrochemistry The industrial departments such as industry, pharmacy, paper pulp papermaking, electric appliance and electronic instrument.China is actual every year produces mercury quantity about 1100t, uses mercury total amount It is 1100～1500t.So using widely, the mercury scattering and disappearing in environment in the annual whole world is about 1.5 × 104～3.0 × 104t, Pollute environment with " waste gas, waste residue, waste water " three kinds of approach.
Mercury and mercuric compounds is all noxious material, can invade human body by all means, mainly affects the maincenter god of people Warp, mostly is slow poisoning in the ordinary course of things.Its toxicity is accumulation, and wherein inorganic mercury mainly accumulates in internal organ, Shao Liangji Gather other parts in brains, skin and human body.
The harm problem of mercury is recognized by people already, and has developed the process side of multiple physics, chemistry and microorganism Method.But, owing to the range of mercury is extensive, mercurous pollutant is also of a great variety, and every kind is required for using different works Skill can preferably be processed.Process mercury-containing wastes needs to expend the substantial amounts of energy and resource more, and processing cost is high and is difficult to The effect that arrival is processed.
Content of the invention
The present invention is to solve the deficiencies in the prior art, providing in a kind of mercurous pollutant processing moisture content≤80% The removing means of mercury and method, the present invention is achieved by the following technical solution：
The removing means of mercury in a kind of mercurous pollutant, by stock preparation system, preheating and drying system, Thermal desorption system, residue Cooling conveying system and flue gas purification system composition, described stock preparation system, by vibratory sieve A, vibratory sieve B, disintegrating machine and screw rod Conveyer forms, and the screen-aperture of described vibratory sieve A is 5mm, and vibratory sieve A oversize outlet, to vibratory sieve B import, shakes Dynamic sieve A screenings is delivered to Thermal desorption system by screw rod conveyor；The screen-aperture of described vibratory sieve B is 10mm, vibratory sieve B's Oversize enters crusher in crushing, and the screenings of vibratory sieve B is delivered to preheating and drying system by screw rod conveyor；Described disintegrating machine Material after Po Sui is delivered to vibratory sieve B by belt conveyor and is carried out regrading, and described screw rod conveyor is twin-screw conveying Machine；
Described preheating and drying system by airtight dry rotary kiln, be arranged on dry outside rotary kiln heating jacket a, set Put the material-pulling device in drying rotary kiln, be arranged on the breaker dried in rotary kiln and be arranged on outside heating jacket a Heat preservation sandwich layer a forms；Described material-pulling device is arranged on drying rotary kiln Inner Front End, and described breaker is arranged on dries back Rear end in rotary kiln, the 30%-50% of described material-pulling device a length of drying rotary kiln length, the length of described breaker For drying the 50%-70% of rotary kiln length；Being provided with charging aperture in the middle of described drying rotary kiln one end, top is provided with low temperature cigarette Gas exports, and is provided with tremie pipe bottom other end；
Heating jacket b that described Thermal desorption system by airtight high temperature rotary kiln, is arranged on outside high temperature rotary kiln, setting Breaker in high temperature rotary kiln and the heat preservation sandwich layer b composition being arranged on outside heating jacket b；Described high temperature rotary kiln is It is provided with the special rotary kiln of steel construction of liner；It is communicated with the charging aperture b of tremie pipe bottom described high temperature rotary kiln one end, Being provided with blanking device bottom other end, top is provided with high-temperature flue gas outlet；
Described high temperature rotary kiln is provided with a flue gas communicating pipe, and the entrance point of described flue gas communicating pipe is communicated to height Inside temperature rotary kiln, the port of export is communicated to dry in rotary kiln, and flue gas communicating pipe is provided with control valve；
Being equipped with several heated nozzles in described heating jacket a and b, heating jacket a with b is connected by string heat pipe, Described string heat pipe is provided with string thermal valve；Heating jacket a and b is provided with exhaust outlet；
The port of export of described heated nozzle is arranged in described heating jacket a or b, and entrance point is arranged on natural gas tube On, described natural gas tube is provided with heating main valve, and each heated nozzle is provided with a heat control valve；
Described residue cooling conveying system is made up of conveyer and the cooling jacket being located at outside conveyer, described cooling Chuck one end is provided with water inlet, and other end is provided with delivery port；The feed end of described conveyer be arranged on blanking device just under Side；
Described flue gas purification system by flue gas inlet tube, gas-distribution pipe, bagroom, spray absorber, packed tower, remove Day with fog, adsorption tanks and blower fan composition, described flue gas inlet tube is two, is respectively communicated to the low temperature cigarette of low-temperature flue gas outlet Tracheae and the high-temperature flue gas pipe being communicated to high-temperature flue gas outlet, described low-temperature flue gas pipe and high-temperature flue gas pipe are equipped with regulation Valve；The port of export of low-temperature flue gas pipe and high-temperature flue gas pipe is all communicated to gas-distribution pipe, and described gas-distribution pipe is provided with temperature sensor And emergency valve；The gas-distribution pipe port of export is communicated to bagroom import, and bagroom outlet is to spray-absorption tower flue gas Import；Spray absorber exhanst gas outlet is communicated to packed tower gas approach, and packed tower exhanst gas outlet is communicated to demister flue gas and enters Mouthful；Demister exhanst gas outlet is communicated to fan inlet, and fan outlet is communicated to adsorption tanks import, and adsorption tanks outlet is connected with exhaust Chimney；It is provided with grug feeding jar between described spray absorber and packed tower, bottom described grug feeding jar, be provided with dosing pump, dosing pump The outlet port of export is arranged on spray absorber and packed tower inner tip, if the described dosing pump outlet port of export is provided with Dry spray head；Described adsorption tanks are filled with activated carbon.
It is equipped with safety valve on described drying rotary kiln and high temperature rotary kiln.
The thickness of the middle filler of described packed tower is 1.5-2m.
In described adsorption tanks, the thickness of the activated carbon of filling is 1.5-1.8m, and the height of described adsorption tanks is its diameter At least 5 times, the quantity of described adsorption tanks is 2-6, and adjacent two adsorption tanks connect by way of " series connection ", adsorption tanks The bulk density of middle activated carbon is 0.65t/m3.
Described demister uses mesh mist eliminator, is equipped with antifog filler, the laying of antifog filler in mesh mist eliminator Thickness is 0.5-0.8m.
Described breaker and a diameter of 3-10cm of breaker.
The angle of described preheating and drying system and Thermal desorption system and horizontal direction is 1-10 degree.
In a kind of mercurous pollutant, the removal methods of mercury, comprises the steps of：
(1) pre-process：A. the mercurous pollutant of moisture content≤80% is sent into stock preparation system to sieve, take particle diameter ＜ The mercurous pollutant of 5mm sends into Thermal desorption system；B. regrading is carried out to the mercurous pollutant of particle diameter >=5mm, take particle diameter ＜ The mercurous pollutant of 8mm sends into preheating and drying system, and the mercurous pollutant to particle diameter >=8mm for the c. carries out break process, after broken Mercurous pollutant repeat b operation；In described mercurous pollutant, the content of mercury is：300～3000mg/kg；
(2) preheating and drying：The mercurous pollutant sent in step 1 in preheating and drying system is led in preheating and drying system Cross the high-temperature fuel gas heat drying returning in natural gas and high temperature mercury fume and string heat pipe, simultaneously by rod iron to described Mercurous pollutant is ground, and baking temperature is 200-300 DEG C, obtain after being dried low-temperature flue gas that temperature is 100-130 DEG C and Mercurous pollutant, the low-temperature flue gas of gained send subsequent handling purified treatment, and the mercurous pollutant of gained send Thermal desorption system；
(3) demercuration is resolved：By the mercurous pollutant of gained in step (2) and containing of step (1) middle feeding Thermal desorption system Mercury contaminants passes through heated by natural gas to 500-600 DEG C in Thermal desorption system, simultaneously by the rod iron pair in Thermal desorption system Described mercurous pollutant is ground, and obtains high temperature mercury fume that temperature is 420-500 DEG C and mercury content is 5～50mg/ Kg residue；Return the high temperature mercury fume part of gained in step (2) and be dried, at remainder dispensing subsequent handling purification Reason；After combustion of natural gas, produced high-temperature fuel gas is returned in step (2) by string heat pipe；The residue of gained is defeated through residue cooling System is sent to be cooled to landfill disposal after normal temperature；
(4) mercury fume purifies：By the low-temperature flue gas of gained in step (2) and the mercurous cigarette of high temperature of gained in step (3) Gas is respectively fed to flue gas purification system, by gas-distribution pipe distribution, adjusts temperature to 130-150 DEG C, gathers dust through sack cleaner After spray absorber and packed tower and vulcanized sodium react receipts mercury, through demister except mist after send into adsorption tanks through blower fan, in absorption In tank after the further adsorption treatment of activated carbon, mercury content≤0.01mg/m in the tail gas obtaining3, temperature≤25 DEG C, particulate matter Concentration≤10mg/m3；Circulation in step (1) is returned after the sludge dewatering producing after scrubbing tower washing.
Described stock preparation system, is made up of vibratory sieve A, vibratory sieve B, disintegrating machine and screw rod conveyor, described vibratory sieve A Screen-aperture be 5mm, vibratory sieve A oversize outlet to vibratory sieve B import, vibratory sieve A screenings is by screw rod conveyor Deliver to Thermal desorption system；The screen-aperture of described vibratory sieve B is 10mm, and the oversize of vibratory sieve B enters crusher in crushing, shakes The screenings of dynamic sieve B is delivered to preheating and drying system by screw rod conveyor；The described material after crusher in crushing is by Belt Conveying Machine is delivered to vibratory sieve B and is carried out regrading, and described screw rod conveyor is double-screw conveyor；
Described preheating and drying system by airtight dry rotary kiln, be arranged on dry outside rotary kiln heating jacket a, set Put the material-pulling device in drying rotary kiln, be arranged on the breaker dried in rotary kiln and be arranged on outside heating jacket a Heat preservation sandwich layer a forms；Described material-pulling device is arranged on drying rotary kiln Inner Front End, and described breaker is arranged on dries back Rear end in rotary kiln, the 30%-50% of described material-pulling device a length of drying rotary kiln length, the length of described breaker For drying the 50%-70% of rotary kiln length；Being provided with charging aperture in the middle of described drying rotary kiln one end, top is provided with low temperature cigarette Gas exports, and is provided with tremie pipe bottom other end；
Heating jacket b that described Thermal desorption system by airtight high temperature rotary kiln, is arranged on outside high temperature rotary kiln, setting Breaker in high temperature rotary kiln and the heat preservation sandwich layer b composition being arranged on outside heating jacket b；Described high temperature rotary kiln is The special rotary kiln of steel construction titanium lined；It is communicated with the charging aperture b of tremie pipe, separately bottom described high temperature rotary kiln one end Being provided with blanking device bottom outer one end, top is provided with high-temperature flue gas outlet；
Described high temperature rotary kiln is provided with a flue gas communicating pipe, and the entrance point of described flue gas communicating pipe is communicated to height Inside temperature rotary kiln, the port of export is communicated to dry in rotary kiln, and flue gas communicating pipe is provided with control valve；
Being equipped with several heated nozzles in described heating jacket a and b, heating jacket a with b is connected by string heat pipe, Described string heat pipe is provided with string thermal valve；Heating jacket a and b is provided with exhaust outlet；
The port of export of described heated nozzle is arranged in described heating jacket a or b, and entrance point is arranged on natural gas tube On, described natural gas tube is provided with heating main valve, and each heated nozzle is provided with a heat control valve；
Described residue cooling conveying system is made up of conveyer and the cooling jacket being located at outside conveyer, described cooling Chuck one end is provided with water inlet, and other end is provided with delivery port；The feed end of described conveyer be arranged on blanking device just under Side；
Described flue gas purification system by flue gas inlet tube, gas-distribution pipe, bagroom, spray absorber, packed tower, remove Day with fog, adsorption tanks and blower fan composition, described flue gas inlet tube is two, is respectively communicated to the low temperature cigarette of low-temperature flue gas outlet Tracheae and the high-temperature flue gas pipe being communicated to high-temperature flue gas outlet, described low-temperature flue gas pipe and high-temperature flue gas pipe are equipped with regulation Valve；The port of export of low-temperature flue gas pipe and high-temperature flue gas pipe is all communicated to gas-distribution pipe, and described gas-distribution pipe is provided with temperature sensor And emergency valve；The gas-distribution pipe port of export is communicated to bagroom import, and bagroom outlet is to spray-absorption tower flue gas Import；Spray absorber exhanst gas outlet is communicated to packed tower gas approach, and packed tower exhanst gas outlet is communicated to demister flue gas and enters Mouthful；Demister exhanst gas outlet is communicated to fan inlet, and fan outlet is communicated to adsorption tanks import, and adsorption tanks outlet is connected with exhaust Chimney；It is provided with grug feeding jar between described spray absorber and packed tower, bottom described grug feeding jar, be provided with dosing pump, dosing pump The outlet port of export is arranged on spray absorber and packed tower inner tip, if the described dosing pump outlet port of export is provided with Dry spray head；Described adsorption tanks are filled with activated carbon；
It is equipped with safety valve, the thickness of the middle filler of described packed tower on described drying rotary kiln and high temperature rotary kiln For 1.5-2m, in described adsorption tanks, the thickness of the activated carbon of filling is 1.5-1.8m, and the height of described adsorption tanks is that it is straight At least 5 times of footpath, the quantity of described adsorption tanks is 2-6, and adjacent two adsorption tanks connect by way of " series connection ", absorption In tank, the bulk density of activated carbon is 0.65t/m3, described demister uses mesh mist eliminator, is equipped with in mesh mist eliminator Antifog filler, the laying depth of antifog filler is 0.5-0.8m, a diameter of 3-10cm of described breaker and breaker, The angle of described preheating and drying system and Thermal desorption system and horizontal direction is 1-10 degree.
Compared with prior art, the present invention has the advantages that：(1) present invention solves in prior art for water Part content is compared with the high mercurous problem that pollutant intractability is big, processing cost is high, it is achieved that pollutant can also while process Enough reclaim mercury resource, there is preferable environmental benefit and economic benefit；(2) present invention uses rotary kiln to carry out mercurous pollutant Preheating and drying, is provided with material-pulling device in drying rotary kiln, and the mercurous pollutant of water content≤80% is in rotary kiln Promoted by screw rod and advance, it is ensured that will not block because of sizing on rotary kiln wall；(3) present invention uses at high temperature rotating Kiln and drying rotary kiln add rod iron grind, further grind broken to passing through dry material, it is ensured that thing Material can react abundant, improves reactivity；(4) whole system uses closed processes, it is ensured that course of reaction is produced Mercury fume will not reveal, add security；(5) present invention uses high-temperature flue gas and high-temperature fuel gas to cold flue gas and cold thing Material heats, thus reduces heating and be dried the energy consumption that cold flue gas needs, and also reduces needed for cooling high temperature flue gas simultaneously The energy consumption wanted, greatly reduces production cost；(6) assembly of the invention is provided with safety valve, thus ensure that production process Safely controllable；(7) by high-temperature flue gas and low-temperature smoke gas thus flue gas is entered by the method reducing flue-gas temperature in present invention employing Row cooling, eliminates surface cooler or other cooling devices, and technological process is shortened, and energy consumption reduces；(8) assembly of the invention design is closed Manage, be skillfully constructed, practical and convenient；The method of the present invention is reliable and stable, energy-conserving and environment-protective；Use apparatus and method of the present invention process Later the mercury content in residue is 5～50mg/kg, mercury content≤0.01mg/m in the tail gas of emptying3, temperature≤25 DEG C, Grain substrate concentration≤10mg/m3.
Brief description
Fig. 1 is the schematic flow sheet of the present invention；
Fig. 2 is preheating and drying system and the Thermal desorption system architecture schematic diagram of the present invention；
Fig. 3 is the residue cooling conveying system structural representation of the present invention；
Fig. 4 is the flue gas purification system structural representation of the present invention；
In figure：1-vibratory sieve A, 2-vibratory sieve B, 3-belt conveyor, 4-disintegrating machine, 5-high temperature rotary kiln, 6-cloth bag is received Dirt device, 7-spray absorber, 8-grug feeding jar, 9-packed tower, 10-demister, 11-blower fan, 12-adsorption tanks, 13-conveyer, 14- Exhaust chimney, 15-dries rotary kiln, 16-screw rod conveyor, and 17-low-temperature flue gas exports, 18-material-pulling device, 19-exhaust outlet, 20-heat preservation sandwich layer a, 21-heating jacket a, 22-breaker, 23-goes here and there heat pipe, and 24-goes here and there thermal valve, and 25-flue gas communicating pipe, 26-is controlled Valve processed, 27-heating jacket b, 29-heat preservation sandwich layer b, 30-high-temperature flue gas exports, 31-blanking device, 32-charging aperture b, 33-natural gas Pipe, 34-heats main valve, 35-heated nozzle, 36-heat control valve, 37-safety valve, and 38-drives motor, 39-cooling jacket, 40-water inlet, 41-delivery port, 42-low-temperature flue gas pipe, 43-high-temperature flue gas pipe, 44-regulates valve, 45-gas-distribution pipe, and 46-temperature passes Sensor, 47-emergency valve, 48-dosing pump outlet, 49-spray head, 50-filler, the antifog filler of 51-, 52-frequency converter, 53-lives Property charcoal, 54-dosing pump.
Detailed description of the invention
The present invention will be further described with embodiment below in conjunction with the accompanying drawings, but protection scope of the present invention is not by embodiment Limited.
Embodiment 1
The removing means of mercury in a kind of mercurous pollutant, by stock preparation system, preheating and drying system, Thermal desorption system, residue Cooling conveying system and flue gas purification system composition, described stock preparation system, by vibratory sieve A (1), vibratory sieve B (2), disintegrating machine (4) forming with screw rod conveyor (16), the screen-aperture of described vibratory sieve A is 5mm, and vibratory sieve A oversize outlet arrives Vibratory sieve B import, vibratory sieve A screenings is delivered to Thermal desorption system by screw rod conveyor；The screen-aperture of described vibratory sieve B is The oversize of 10mm, vibratory sieve B enters crusher in crushing, and the screenings of vibratory sieve B is delivered to preheating and drying system by screw rod conveyor System；The described material after crusher in crushing is delivered to vibratory sieve B by belt conveyor (3) and is carried out regrading, described screw rod Conveyer is double-screw conveyor；
Described preheating and drying system is by airtight drying rotary kiln (15), the heating jacket being arranged on outside drying rotary kiln A (21), the material-pulling device (18) being arranged in drying rotary kiln, the breaker (22) being arranged in drying rotary kiln and setting Heat preservation sandwich layer a (20) composition outside heating jacket a；Described material-pulling device is arranged on drying rotary kiln Inner Front End, described Breaker is arranged on rear end in drying rotary kiln, a length of 30%-50% drying rotary kiln length of described material-pulling device, The 50%-70% of a length of drying rotary kiln length of described breaker；It is provided with in the middle of described drying rotary kiln one end Charging aperture, top is provided with low-temperature flue gas outlet (17), is provided with tremie pipe bottom other end；
Described Thermal desorption system is by airtight high temperature rotary kiln (5), the heating jacket b being arranged on outside high temperature rotary kiln (27) it, is arranged on the breaker in high temperature rotary kiln and heat preservation sandwich layer b (29) composition being arranged on outside heating jacket b；Described High temperature rotary kiln be the special rotary kiln of steel construction titanium lined；It is communicated with blanking bottom described high temperature rotary kiln one end The charging aperture b (32) of pipe, is provided with blanking device (31) bottom other end, top is provided with high-temperature flue gas outlet (30)；
Described high temperature rotary kiln is provided with a flue gas communicating pipe (25), the entrance point connection of described flue gas communicating pipe Inside high temperature rotary kiln, the port of export is communicated to dry in rotary kiln, is provided with control valve (26) flue gas communicating pipe；
Being equipped with several heated nozzles (35) in described heating jacket a and b, heating jacket a and b is by string heat pipe (23) connecting, described string heat pipe is provided with string thermal valve (24)；Heating jacket a and b is provided with exhaust outlet (19)；
The port of export of described heated nozzle is arranged in described heating jacket a or b, and entrance point is arranged on natural gas tube (33), on, described natural gas tube is provided with heating main valve (34), and each heated nozzle is provided with a heat control valve (36)；
Described residue cooling conveying system is made up of conveyer (13) and the cooling jacket (39) being located at outside conveyer, institute The cooling jacket one end stated is provided with water inlet (40), and other end is provided with delivery port (41)；The feed end of described conveyer sets Put the underface at blanking device；
Described flue gas purification system is by flue gas inlet tube, gas-distribution pipe (45), bagroom (6), spray absorber (7), packed tower (9), demister (10), adsorption tanks (12) and blower fan (11) composition, described flue gas inlet tube is two, respectively For being communicated to the low-temperature flue gas pipe (42) of low-temperature flue gas outlet and the high-temperature flue gas pipe (43) being communicated to high-temperature flue gas outlet, described Low-temperature flue gas pipe and high-temperature flue gas pipe on be equipped with regulation valve (44)；The port of export of low-temperature flue gas pipe and high-temperature flue gas pipe all connects Leading to gas-distribution pipe, described gas-distribution pipe is provided with temperature sensor (46) and emergency valve (47)；The gas-distribution pipe port of export is communicated to cloth Bag collector import, bagroom outlet is to spray absorber gas approach；Spray absorber exhanst gas outlet is communicated to Packed tower gas approach, packed tower exhanst gas outlet is communicated to demister gas approach；Demister exhanst gas outlet is communicated to blower fan and enters Mouthful, fan outlet is communicated to adsorption tanks import, and adsorption tanks outlet is connected with exhaust chimney (14)；Described spray absorber and filling out Being provided with grug feeding jar (8) between material tower, being provided with dosing pump (54) bottom described grug feeding jar, dosing pump outlet (48) port of export sets Putting in spray absorber and packed tower inner tip, the described dosing pump outlet port of export is provided with several spray heads (49)；Described adsorption tanks are filled with activated carbon (53).
It is equipped with safety valve (37) on described drying rotary kiln and high temperature rotary kiln, dry rotary kiln and high temperature rotary kiln Bottom is provided with absolutely driving motor (38).
The thickness of the middle filler (50) of described packed tower is 1.5m.
In described adsorption tanks, the thickness of the activated carbon of filling is 1.5m, and the height of described adsorption tanks is the 5 of its diameter Times, the quantity of described adsorption tanks is 2, and adjacent two adsorption tanks connect by way of " series connection ", activated carbon in adsorption tanks Bulk density be 0.65t/m3.
Described demister uses mesh mist eliminator, is equipped with antifog filler (51) in mesh mist eliminator, antifog filler Laying depth is 0.5m.
Described breaker and a diameter of 3cm of breaker.
The angle of described preheating and drying system and Thermal desorption system and horizontal direction is 1 degree.
Described blower fan passes through frequency converter (52) and power supply connects.
The operation principle of the present embodiment is as follows：The material sieving the particle diameter ＜ 5mm taking through stock preparation system is directly entered pyrolysis Analysis system, the mercurous pollutant of 5mm≤particle diameter ＜ 8mm enters from charging aperture a dries in rotary kiln, under the effect of material-pulling device Being fed forward, the pollutant being bonded on kiln wall in course of conveying is scraped by material-pulling device, is not likely to produce blocking；Mercurous pollutant exists In drying rotary kiln, the thermal material in heated chuck is heated to 100-130 DEG C, and the moisture content in now mercurous pollutant is evaporated Go out.During preheating and drying, produced low-temperature flue gas send follow-up goblin's gas cleaning procedure.Dried mercurous pollutant is being dried Rotary kiln rear end is ground further by rod iron after crushing and is entered Thermal desorption system, the thing with particle diameter ＜ 5mm in Thermal desorption system After material mixing, by the action flow of self gravitation.Mercurous pollutant resolves in high temperature rotary kiln at 500-600 DEG C, with When pollutant pulverized further by the rod iron in high temperature rotary kiln, obtain the residue of mercurous high-temperature flue gas and demercuration, obtain Mercury content in the residue of demercuration is 5～50mg/kg.In Thermal desorption system, a produced high-temperature flue gas part is delivered to preheat and is done Dried material in drying system, is partly into follow-up fume purifying processes and purifies.During Thermal desorption, the high-temperature fuel gas of heating passes through String heat pipe enters the chuck continuation heating drying rotary kiln.
The high-temperature flue gas and the low-temperature flue gas that obtain are combined together in gas-distribution pipe, adjust after temperature is 130-150 DEG C and depend on Secondary after bagroom, spray absorber, packed tower, demister, blower fan and adsorption tanks from chimney emptying.
It is designed with heat-insulation layer outside the drying rotary kiln of the present embodiment and high temperature rotary kiln, reduce heat to greatest extent Loss, improves the utilization rate of the energy；Meanwhile, the drying rotary kiln in the present embodiment and high temperature rotary kiln are all through airtight place Reason, mercury fume will not leak, and decreases mercury fume in course of reaction and reveals the problem polluting environment.The present embodiment uses height Cold material is heated by temperature flue gas and high-temperature fuel gas further, improves energy utilization rate.
Embodiment 2
The removing means of mercury in a kind of mercurous pollutant, by stock preparation system, preheating and drying system, Thermal desorption system, residue Cooling conveying system and flue gas purification system composition, described stock preparation system, by vibratory sieve A, vibratory sieve B, disintegrating machine and screw rod Conveyer forms, and the screen-aperture of described vibratory sieve A is 5mm, and vibratory sieve A oversize outlet, to vibratory sieve B import, shakes Dynamic sieve A screenings is delivered to Thermal desorption system by screw rod conveyor；The screen-aperture of described vibratory sieve B is 10mm, vibratory sieve B's Oversize enters crusher in crushing, and the screenings of vibratory sieve B is delivered to preheating and drying system by screw rod conveyor；Described disintegrating machine Material after Po Sui is delivered to vibratory sieve B by belt conveyor and is carried out regrading, and described screw rod conveyor is twin-screw conveying Machine；
Described preheating and drying system by airtight dry rotary kiln, be arranged on dry outside rotary kiln heating jacket a, set Put the material-pulling device in drying rotary kiln, be arranged on the breaker dried in rotary kiln and be arranged on outside heating jacket a Heat preservation sandwich layer a forms；Described material-pulling device is arranged on drying rotary kiln Inner Front End, and described breaker is arranged on dries back Rear end in rotary kiln, the 30%-50% of described material-pulling device a length of drying rotary kiln length, the length of described breaker For drying the 50%-70% of rotary kiln length；Being provided with charging aperture in the middle of described drying rotary kiln one end, top is provided with low temperature cigarette Gas exports, and is provided with tremie pipe bottom other end；
Heating jacket b that described Thermal desorption system by airtight high temperature rotary kiln, is arranged on outside high temperature rotary kiln, setting Breaker in high temperature rotary kiln and the heat preservation sandwich layer b composition being arranged on outside heating jacket b；Described high temperature rotary kiln is The special rotary kiln of steel construction titanium lined；It is communicated with the charging aperture b of tremie pipe, separately bottom described high temperature rotary kiln one end Being provided with blanking device bottom outer one end, top is provided with high-temperature flue gas outlet；
Described high temperature rotary kiln is provided with a flue gas communicating pipe, and the entrance point of described flue gas communicating pipe is communicated to height Inside temperature rotary kiln, the port of export is communicated to dry in rotary kiln, and flue gas communicating pipe is provided with control valve；
Being equipped with several heated nozzles in described heating jacket a and b, heating jacket a with b is connected by string heat pipe, Described string heat pipe is provided with string thermal valve；Heating jacket a and b is provided with exhaust outlet；
The port of export of described heated nozzle is arranged in described heating jacket a or b, and entrance point is arranged on natural gas tube On, described natural gas tube is provided with heating main valve, and each heated nozzle is provided with a heat control valve；
Described residue cooling conveying system is made up of conveyer and the cooling jacket being located at outside conveyer, described cooling Chuck one end is provided with water inlet, and other end is provided with delivery port；The feed end of described conveyer be arranged on blanking device just under Side；
Described flue gas purification system by flue gas inlet tube, gas-distribution pipe, bagroom, spray absorber, packed tower, remove Day with fog, adsorption tanks and blower fan composition, described flue gas inlet tube is two, is respectively communicated to the low temperature cigarette of low-temperature flue gas outlet Tracheae and the high-temperature flue gas pipe being communicated to high-temperature flue gas outlet, described low-temperature flue gas pipe and high-temperature flue gas pipe are equipped with regulation Valve；The port of export of low-temperature flue gas pipe and high-temperature flue gas pipe is all communicated to gas-distribution pipe, and described gas-distribution pipe is provided with temperature sensor And emergency valve；The gas-distribution pipe port of export is communicated to bagroom import, and bagroom outlet is to spray-absorption tower flue gas Import；Spray absorber exhanst gas outlet is communicated to packed tower gas approach, and packed tower exhanst gas outlet is communicated to demister flue gas and enters Mouthful；Demister exhanst gas outlet is communicated to fan inlet, and fan outlet is communicated to adsorption tanks import, and adsorption tanks outlet is connected with exhaust Chimney；It is provided with grug feeding jar between described spray absorber and packed tower, bottom described grug feeding jar, be provided with dosing pump, dosing pump The outlet port of export is arranged on spray absorber and packed tower inner tip, if the described dosing pump outlet port of export is provided with Dry spray head；Described adsorption tanks are filled with activated carbon.
It is equipped with safety valve on described drying rotary kiln and high temperature rotary kiln.
The thickness of the middle filler of described packed tower is 2m.
In described adsorption tanks, the thickness of the activated carbon of filling is 1.8m, and the height of described adsorption tanks is the 8 of its diameter Times, the quantity of described adsorption tanks is 6, and adjacent two adsorption tanks connect by way of " series connection ", activated carbon in adsorption tanks Bulk density be 0.65t/m3.
Described demister uses mesh mist eliminator, is equipped with antifog filler, the laying of antifog filler in mesh mist eliminator Thickness is 0.8m.
Described breaker and a diameter of 10cm of breaker.
The angle of described preheating and drying system and Thermal desorption system and horizontal direction is 10 degree.
The heating interlayer of the drying rotary kiln of the present embodiment and high temperature rotary kiln all use natural gas to provide heat.High Temperature rotary kiln in produce high-temperature flue gas part exported by flue gas communicating pipe, according to demand opening controlling valve thus control high temperature Flue gas enters in drying rotary kiln and directly heats mercurous pollutant.Owing to cold material is heated by employing heat smoke, thus Make whole system is substantially reduced for the energy consumption heating cold material and cooling heat smoke, saved the energy.
The device of the present embodiment can be used for processing pollutant containing arsenic, the pollutant etc. of refuse containing organic matter.
Embodiment 3
The removing means of mercury in a kind of mercurous pollutant, by stock preparation system, preheating and drying system, Thermal desorption system, residue Cooling conveying system and flue gas purification system composition, described stock preparation system, by vibratory sieve A, vibratory sieve B, disintegrating machine and screw rod Conveyer forms, and the screen-aperture of described vibratory sieve A is 5mm, and vibratory sieve A oversize outlet, to vibratory sieve B import, shakes Dynamic sieve A screenings is delivered to Thermal desorption system by screw rod conveyor；The screen-aperture of described vibratory sieve B is 10mm, vibratory sieve B's Oversize enters crusher in crushing, and the screenings of vibratory sieve B is delivered to preheating and drying system by screw rod conveyor；Described disintegrating machine Material after Po Sui is delivered to vibratory sieve B by belt conveyor and is carried out regrading, and described screw rod conveyor is twin-screw conveying Machine；
Described preheating and drying system by airtight dry rotary kiln, be arranged on dry outside rotary kiln heating jacket a, set Put the material-pulling device in drying rotary kiln, be arranged on the breaker dried in rotary kiln and be arranged on outside heating jacket a Heat preservation sandwich layer a forms；Described material-pulling device is arranged on drying rotary kiln Inner Front End, and described breaker is arranged on dries back Rear end in rotary kiln, the 30%-50% of described material-pulling device a length of drying rotary kiln length, the length of described breaker For drying the 50%-70% of rotary kiln length；Being provided with charging aperture in the middle of described drying rotary kiln one end, top is provided with low temperature cigarette Gas exports, and is provided with tremie pipe bottom other end；
Heating jacket b that described Thermal desorption system by airtight high temperature rotary kiln, is arranged on outside high temperature rotary kiln, setting Breaker in high temperature rotary kiln and the heat preservation sandwich layer b composition being arranged on outside heating jacket b；Described high temperature rotary kiln is The special rotary kiln of steel construction titanium lined；It is communicated with the charging aperture b of tremie pipe, separately bottom described high temperature rotary kiln one end Being provided with blanking device bottom outer one end, top is provided with high-temperature flue gas outlet；
Described high temperature rotary kiln is provided with a flue gas communicating pipe, and the entrance point of described flue gas communicating pipe is communicated to height Inside temperature rotary kiln, the port of export is communicated to dry in rotary kiln, and flue gas communicating pipe is provided with control valve；
Being equipped with several heated nozzles in described heating jacket a and b, heating jacket a with b is connected by string heat pipe, Described string heat pipe is provided with string thermal valve；Heating jacket a and b is provided with exhaust outlet；
The port of export of described heated nozzle is arranged in described heating jacket a or b, and entrance point is arranged on natural gas tube On, described natural gas tube is provided with heating main valve, and each heated nozzle is provided with a heat control valve；
Described residue cooling conveying system is made up of conveyer and the cooling jacket being located at outside conveyer, described cooling Chuck one end is provided with water inlet, and other end is provided with delivery port；The feed end of described conveyer be arranged on blanking device just under Side；
Described flue gas purification system by flue gas inlet tube, gas-distribution pipe, bagroom, spray absorber, packed tower, remove Day with fog, adsorption tanks and blower fan composition, described flue gas inlet tube is two, is respectively communicated to the low temperature cigarette of low-temperature flue gas outlet Tracheae and the high-temperature flue gas pipe being communicated to high-temperature flue gas outlet, described low-temperature flue gas pipe and high-temperature flue gas pipe are equipped with regulation Valve；The port of export of low-temperature flue gas pipe and high-temperature flue gas pipe is all communicated to gas-distribution pipe, and described gas-distribution pipe is provided with temperature sensor And emergency valve；The gas-distribution pipe port of export is communicated to bagroom import, and bagroom outlet is to spray-absorption tower flue gas Import；Spray absorber exhanst gas outlet is communicated to packed tower gas approach, and packed tower exhanst gas outlet is communicated to demister flue gas and enters Mouthful；Demister exhanst gas outlet is communicated to fan inlet, and fan outlet is communicated to adsorption tanks import, and adsorption tanks outlet is connected with exhaust Chimney；It is provided with grug feeding jar between described spray absorber and packed tower, bottom described grug feeding jar, be provided with dosing pump, dosing pump The outlet port of export is arranged on spray absorber and packed tower inner tip, if the described dosing pump outlet port of export is provided with Dry spray head；Described adsorption tanks are filled with activated carbon.
It is equipped with safety valve on described drying rotary kiln and high temperature rotary kiln.
The thickness of the middle filler of described packed tower is 1.2m.
In described adsorption tanks, the thickness of the activated carbon of filling is 1.6m, and the height of described adsorption tanks is the 6 of its diameter Times, the quantity of described adsorption tanks is 4, and adjacent two adsorption tanks connect by way of " series connection ", activated carbon in adsorption tanks Bulk density be 0.65t/m3.
Described demister uses mesh mist eliminator, is equipped with antifog filler, the laying of antifog filler in mesh mist eliminator Thickness is 0.65m.
Described breaker and a diameter of 7cm of breaker.
The angle of described preheating and drying system and Thermal desorption system and horizontal direction is 5 degree.
The demercuration residue obtaining after processing mercurous pollutant by the preheating and drying system of the present embodiment and Thermal desorption system Temperature be 500-600 DEG C, hot-engine sludge by blanking device enter residue cooling conveying system, hot-engine sludge is at screw rod conveyor The middle cooling water heat exchange in outer cooling jacket with screw rod conveyor while carried, so that temperature is reduced to room temperature.
Embodiment 4
In a kind of mercurous pollutant, the removal methods of mercury, comprises the steps of：
(1) pre-process：A. the mercurous pollutant of moisture content≤80% is sent into stock preparation system to sieve, take particle diameter ＜ The mercurous pollutant of 5mm sends into Thermal desorption system；B. regrading is carried out to the mercurous pollutant of particle diameter >=5mm, take particle diameter ＜ The mercurous pollutant of 8mm sends into preheating and drying system, and the mercurous pollutant to particle diameter >=8mm for the c. carries out break process, after broken Mercurous pollutant repeat b operation；In described mercurous pollutant, the content of mercury is：300～3000mg/kg；
(2) preheating and drying：The mercurous pollutant sent in step 1 in preheating and drying system is led in preheating and drying system Cross the high-temperature fuel gas heat drying returning in natural gas and high temperature mercury fume and string heat pipe, simultaneously by rod iron to described Mercurous pollutant is ground, and baking temperature is 200-300 DEG C, obtains low-temperature flue gas that temperature is 100 DEG C and mercurous after being dried Pollutant, the low-temperature flue gas of gained send subsequent handling purified treatment, and the mercurous pollutant of gained send Thermal desorption system；
(3) demercuration is resolved：By the mercurous pollutant of gained in step (2) and containing of step (1) middle feeding Thermal desorption system Mercury contaminants passes through heated by natural gas to 500-600 DEG C in Thermal desorption system, simultaneously by the rod iron pair in Thermal desorption system Described mercurous pollutant is ground, and obtains high temperature mercury fume that temperature is 500 DEG C and mercury content is that 5～50mg/kg is residual Slag；Returning the high temperature mercury fume part of gained in step (2) and being dried, remainder sends subsequent handling purified treatment； After combustion of natural gas, produced high-temperature fuel gas is returned in step (2) by string heat pipe；The residue of gained is through residue cooling conveying System is cooled to landfill disposal after normal temperature；
(4) mercury fume purifies：By the low-temperature flue gas of gained in step (2) and the mercurous cigarette of high temperature of gained in step (3) Gas is respectively fed to flue gas purification system, by gas-distribution pipe distribution, adjusts temperature to 150 DEG C, after sack cleaner gathers dust Spray absorber and packed tower react receipts mercury with vulcanized sodium, send into adsorption tanks through blower fan through demister after mist, in adsorption tanks After the further adsorption treatment of activated carbon, mercury content≤0.01mg/m in the tail gas obtaining3, temperature≤25 DEG C, particle concentration ≤10mg/m3；Circulation in step (1) is returned after the sludge dewatering producing after scrubbing tower washing.
Embodiment 5
In a kind of mercurous pollutant, the removal methods of mercury, comprises the steps of：
(1) pre-process：A. the mercurous pollutant of moisture content≤80% is sent into stock preparation system to sieve, take particle diameter ＜ The mercurous pollutant of 5mm sends into Thermal desorption system；B. regrading is carried out to the mercurous pollutant of particle diameter >=5mm, take particle diameter ＜ The mercurous pollutant of 8mm sends into preheating and drying system, and the mercurous pollutant to particle diameter >=8mm for the c. carries out break process, after broken Mercurous pollutant repeat b operation；In described mercurous pollutant, the content of mercury is：300～3000mg/kg；
(2) preheating and drying：The mercurous pollutant sent in step 1 in preheating and drying system is led in preheating and drying system Cross the high-temperature fuel gas heat drying returning in natural gas and high temperature mercury fume and string heat pipe, simultaneously by rod iron to described Mercurous pollutant is ground, and baking temperature is 200-300 DEG C, obtains low-temperature flue gas that temperature is 130 DEG C and mercurous after being dried Pollutant, the low-temperature flue gas of gained send subsequent handling purified treatment, and the mercurous pollutant of gained send Thermal desorption system；
(3) demercuration is resolved：By the mercurous pollutant of gained in step (2) and containing of step (1) middle feeding Thermal desorption system Mercury contaminants passes through heated by natural gas to 500-600 DEG C in Thermal desorption system, simultaneously by the rod iron pair in Thermal desorption system Described mercurous pollutant is ground, and obtains high temperature mercury fume that temperature is 420 DEG C and mercury content is that 5～50mg/kg is residual Slag；Returning the high temperature mercury fume part of gained in step (2) and being dried, remainder sends subsequent handling purified treatment； After combustion of natural gas, produced high-temperature fuel gas is returned in step (2) by string heat pipe；The residue of gained is through residue cooling conveying System is cooled to landfill disposal after normal temperature；
(4) mercury fume purifies：By the low-temperature flue gas of gained in step (2) and the mercurous cigarette of high temperature of gained in step (3) Gas is respectively fed to flue gas purification system, by gas-distribution pipe distribution, adjusts temperature to 130 DEG C, after sack cleaner gathers dust Spray absorber and packed tower react receipts mercury with vulcanized sodium, send into adsorption tanks through blower fan through demister after mist, in adsorption tanks After the further adsorption treatment of activated carbon, mercury content≤0.01mg/m in the tail gas obtaining3, temperature≤25 DEG C, particle concentration ≤10mg/m3；Circulation in step (1) is returned after the sludge dewatering producing after scrubbing tower washing.
Embodiment 6
In a kind of mercurous pollutant, the removal methods of mercury, comprises the steps of：
(1) pre-process：A. the mercurous pollutant of moisture content≤80% is sent into stock preparation system to sieve, take particle diameter ＜ The mercurous pollutant of 5mm sends into Thermal desorption system；B. regrading is carried out to the mercurous pollutant of particle diameter >=5mm, take particle diameter ＜ The mercurous pollutant of 8mm sends into preheating and drying system, and the mercurous pollutant to particle diameter >=8mm for the c. carries out break process, after broken Mercurous pollutant repeat b operation；In described mercurous pollutant, the content of mercury is：300～3000mg/kg；
(2) preheating and drying：The mercurous pollutant sent in step 1 in preheating and drying system is led in preheating and drying system Cross the high-temperature fuel gas heat drying returning in natural gas and high temperature mercury fume and string heat pipe, simultaneously by rod iron to described Mercurous pollutant is ground, and baking temperature is 200-300 DEG C, obtains low-temperature flue gas that temperature is 120 DEG C and mercurous after being dried Pollutant, the low-temperature flue gas of gained send subsequent handling purified treatment, and the mercurous pollutant of gained send Thermal desorption system；
(3) demercuration is resolved：By the mercurous pollutant of gained in step (2) and containing of step (1) middle feeding Thermal desorption system Mercury contaminants passes through heated by natural gas to 500-600 DEG C in Thermal desorption system, simultaneously by the rod iron pair in Thermal desorption system Described mercurous pollutant is ground, and obtains high temperature mercury fume that temperature is 460 DEG C and mercury content is that 5～50mg/kg is residual Slag；Returning the high temperature mercury fume part of gained in step (2) and being dried, remainder sends subsequent handling purified treatment； After combustion of natural gas, produced high-temperature fuel gas is returned in step (2) by string heat pipe；The residue of gained is through residue cooling conveying System is cooled to landfill disposal after normal temperature；
(4) mercury fume purifies：By the low-temperature flue gas of gained in step (2) and the mercurous cigarette of high temperature of gained in step (3) Gas is respectively fed to flue gas purification system, by gas-distribution pipe distribution, adjusts temperature to 140 DEG C, after sack cleaner gathers dust Spray absorber and packed tower react receipts mercury with vulcanized sodium, send into adsorption tanks through blower fan through demister after mist, in adsorption tanks After the further adsorption treatment of activated carbon, mercury content≤0.01mg/m in the tail gas obtaining3, temperature≤25 DEG C, particle concentration ≤10mg/m3；Circulation in step (1) is returned after the sludge dewatering producing after scrubbing tower washing.
The method of the present embodiment is equally applicable to process pollutant containing arsenic, the pollutant etc. containing debirs.

Claims (9)

1. the removing means of mercury in mercurous pollutant, cold by stock preparation system, preheating and drying system, Thermal desorption system, residue But induction system and flue gas purification system composition, it is characterised in that
Described stock preparation system, is made up of vibratory sieve A, vibratory sieve B, disintegrating machine and screw rod conveyor, the sieve of described vibratory sieve A Aperture, hole is 5mm, vibratory sieve A oversize outlet to vibratory sieve B import, and vibratory sieve A screenings is delivered to by screw rod conveyor Thermal desorption system；The screen-aperture of described vibratory sieve B is 10mm, and the oversize of vibratory sieve B enters crusher in crushing, vibratory sieve The screenings of B is delivered to preheating and drying system by screw rod conveyor；The described material after crusher in crushing is sent by belt conveyor Carrying out regrading to vibratory sieve B, described screw rod conveyor is double-screw conveyor；
Described preheating and drying system by airtight dry rotary kiln, be arranged on dry outside rotary kiln heating jacket a, be arranged on Dry the material-pulling device in rotary kiln, be arranged on the breaker dried in rotary kiln and the insulation being arranged on outside heating jacket a Interlayer a forms；Described material-pulling device is arranged on drying rotary kiln Inner Front End, and described breaker is arranged on drying rotary kiln Interior rear end, the 30%-50% of described material-pulling device a length of drying rotary kiln length, a length of baking of described breaker The 50%-70% of dry rotary kiln length；Being provided with charging aperture in the middle of described drying rotary kiln one end, top is provided with low-temperature flue gas and goes out Mouthful, it is provided with tremie pipe bottom other end；
It heating jacket b that described Thermal desorption system by airtight high temperature rotary kiln, is arranged on outside high temperature rotary kiln, is arranged on height Breaker in temperature rotary kiln and the heat preservation sandwich layer b composition being arranged on outside heating jacket b；Described high temperature rotary kiln is for being provided with The special rotary kiln of the steel construction of liner；It is communicated with the charging aperture b of tremie pipe, separately bottom described high temperature rotary kiln one end Being provided with blanking device bottom outer one end, top is provided with high-temperature flue gas outlet；
Described high temperature rotary kiln is provided with a flue gas communicating pipe, and the entrance point of described flue gas communicating pipe is communicated to high temperature and returns Inside rotary kiln, the port of export is communicated to dry in rotary kiln, and flue gas communicating pipe is provided with control valve；
Being equipped with several heated nozzles in described heating jacket a and b, heating jacket a with b is connected by string heat pipe, described String heat pipe be provided with string thermal valve；Heating jacket a and b is provided with exhaust outlet；
The port of export of described heated nozzle is arranged in described heating jacket a or b, and entrance point is arranged on natural gas tube, Described natural gas tube is provided with heating main valve, and each heated nozzle is provided with a heat control valve；
Described residue cooling conveying system is made up of conveyer and the cooling jacket being located at outside conveyer, described cooling jacket One end is provided with water inlet, and other end is provided with delivery port；The feed end of described conveyer is arranged on the underface of blanking device；
Described flue gas purification system by flue gas inlet tube, gas-distribution pipe, bagroom, spray absorber, packed tower, remove mist Device, adsorption tanks and blower fan composition, described flue gas inlet tube is two, is respectively communicated to the low-temperature flue gas of low-temperature flue gas outlet Pipe and the high-temperature flue gas pipe being communicated to high-temperature flue gas outlet, described low-temperature flue gas pipe and high-temperature flue gas pipe are equipped with regulation Valve；The port of export of low-temperature flue gas pipe and high-temperature flue gas pipe is all communicated to gas-distribution pipe, and described gas-distribution pipe is provided with temperature sensor And emergency valve；The gas-distribution pipe port of export is communicated to bagroom import, and bagroom outlet is to spray-absorption tower flue gas Import；Spray absorber exhanst gas outlet is communicated to packed tower gas approach, and packed tower exhanst gas outlet is communicated to demister flue gas and enters Mouthful；Demister exhanst gas outlet is communicated to fan inlet, and fan outlet is communicated to adsorption tanks import, and adsorption tanks outlet is connected with exhaust Chimney；It is provided with grug feeding jar between described spray absorber and packed tower, bottom described grug feeding jar, be provided with dosing pump, dosing pump The outlet port of export is arranged on spray absorber and packed tower inner tip, if the described dosing pump outlet port of export is provided with Dry spray head；Described adsorption tanks are filled with activated carbon.
2. the removing means of mercury in a kind of mercurous pollutant according to claim 1, it is characterised in that described drying is returned It is equipped with safety valve on rotary kiln and high temperature rotary kiln.
3. the removing means of mercury in a kind of mercurous pollutant according to claim 1, it is characterised in that described packed tower The thickness of middle filler be 1.5-2m.
4. the removing means of mercury in a kind of mercurous pollutant according to claim 1, it is characterised in that described adsorption tanks The thickness of the activated carbon of middle filling is 1.5-1.8m, and the height of described adsorption tanks is at least 5 times of its diameter, described absorption The quantity of tank is 2-6, and adjacent two adsorption tanks connect by way of " series connection ", and in adsorption tanks, the bulk density of activated carbon is 0.65t/m3.
5. the removing means of mercury in a kind of mercurous pollutant according to claim 1, it is characterised in that described demister Using mesh mist eliminator, being equipped with antifog filler in mesh mist eliminator, the laying depth of antifog filler is 0.5-0.8m.
6. the removing means of mercury in a kind of mercurous pollutant according to claim 1, it is characterised in that described broken dress It is set to rod iron and/or steel ball.
7. the removing means of mercury in a kind of mercurous pollutant according to claim 1, it is characterised in that described preheating and drying The angle of system and Thermal desorption system and horizontal direction is 1-10 degree.
8. the removal methods of mercury in a mercurous pollutant, it is characterised in that comprise the steps of：
(1) pre-process：A. the mercurous pollutant of moisture content≤80% is sent into stock preparation system to sieve, take particle diameter ＜ 5mm's Mercurous pollutant sends into Thermal desorption system；B. regrading is carried out to the mercurous pollutant of particle diameter >=5mm, take particle diameter ＜ 8mm and contain Mercury contaminants sends into preheating and drying system, and the mercurous pollutant to particle diameter >=8mm for the c. carries out break process, mercurous to after broken Pollutant repeats b operation；In described mercurous pollutant, the content of mercury is：300～3000mg/kg；
(2) preheating and drying：The mercurous pollutant sent in step (1) in preheating and drying system is passed through in preheating and drying system The high-temperature fuel gas heat drying returning in natural gas and high temperature mercury fume and string heat pipe, is contained to described by rod iron simultaneously Mercury contaminants is ground, and baking temperature is 200-300 DEG C, obtains low-temperature flue gas that temperature is 100-130 DEG C and contain after being dried Mercury contaminants, the low-temperature flue gas of gained send subsequent handling purified treatment, and the mercurous pollutant of gained send Thermal desorption system；
(3) demercuration is resolved：By the mercurous pollutant of gained in step (2) and the mercurous dirt of feeding Thermal desorption system in step (1) Dye thing passes through heated by natural gas to 500-600 DEG C in Thermal desorption system, passes through rod iron in Thermal desorption system to described simultaneously Mercurous pollutant be ground, obtain high temperature mercury fume that temperature is 420-500 DEG C and mercury content be that 5～50mg/kg is residual Slag；Returning the high temperature mercury fume part of gained in step (2) and being dried, remainder sends subsequent handling purified treatment； After combustion of natural gas, produced high-temperature fuel gas is returned in step (2) by string heat pipe；The residue of gained is through residue cooling conveying System is cooled to landfill disposal after normal temperature；
(4) mercury fume purifies：By in step (2) gained low-temperature flue gas and in step (3) the high temperature mercury fume of gained divide Not Song Ru flue gas purification system, by gas-distribution pipe distribution, adjust temperature to 130-150 DEG C, after sack cleaner gathers dust Spray absorber and packed tower react receipts mercury with vulcanized sodium, send into adsorption tanks through blower fan through demister after mist, in adsorption tanks After the further adsorption treatment of activated carbon, mercury content≤0.01mg/m in the tail gas obtaining3, temperature≤25 DEG C, particle concentration ≤10mg/m3；Circulation in step (1) is returned after the sludge dewatering producing after scrubbing tower washing.
9. the removal methods of mercury in a kind of mercurous pollutant according to claim 6,
It is characterized in that,
Described stock preparation system, is made up of vibratory sieve A, vibratory sieve B, disintegrating machine and screw rod conveyor, the sieve of described vibratory sieve A Aperture, hole is 5mm, vibratory sieve A oversize outlet to vibratory sieve B import, and vibratory sieve A screenings is delivered to by screw rod conveyor Thermal desorption system；The screen-aperture of described vibratory sieve B is 10mm, and the oversize of vibratory sieve B enters crusher in crushing, vibratory sieve The screenings of B is delivered to preheating and drying system by screw rod conveyor；The described material after crusher in crushing is sent by belt conveyor Carrying out regrading to vibratory sieve B, described screw rod conveyor is double-screw conveyor；
Described preheating and drying system by airtight dry rotary kiln, be arranged on dry outside rotary kiln heating jacket a, be arranged on Dry the material-pulling device in rotary kiln, be arranged on the breaker dried in rotary kiln and the insulation being arranged on outside heating jacket a Interlayer a forms；Described material-pulling device is arranged on drying rotary kiln Inner Front End, and described breaker is arranged on drying rotary kiln Interior rear end, the 30%-50% of described material-pulling device a length of drying rotary kiln length, a length of baking of described breaker The 50%-70% of dry rotary kiln length；Being provided with charging aperture in the middle of described drying rotary kiln one end, top is provided with low-temperature flue gas and goes out Mouthful, it is provided with tremie pipe bottom other end；
It heating jacket b that described Thermal desorption system by airtight high temperature rotary kiln, is arranged on outside high temperature rotary kiln, is arranged on height Breaker in temperature rotary kiln and the heat preservation sandwich layer b composition being arranged on outside heating jacket b；Described high temperature rotary kiln is for being provided with The special rotary kiln of steel construction of liner；It is communicated with the charging aperture b of tremie pipe, additionally bottom described high temperature rotary kiln one end Being provided with blanking device bottom one end, top is provided with high-temperature flue gas outlet；
Described high temperature rotary kiln is provided with a flue gas communicating pipe, and the entrance point of described flue gas communicating pipe is communicated to high temperature and returns Inside rotary kiln, the port of export is communicated to dry in rotary kiln, and flue gas communicating pipe is provided with control valve；
Being equipped with several heated nozzles in described heating jacket a and b, heating jacket a with b is connected by string heat pipe, described String heat pipe be provided with string thermal valve；Heating jacket a and b is provided with exhaust outlet；
The port of export of described heated nozzle is arranged in described heating jacket a or b, and entrance point is arranged on natural gas tube, Described natural gas tube is provided with heating main valve, and each heated nozzle is provided with a heat control valve；
Described residue cooling conveying system is made up of conveyer and the cooling jacket being located at outside conveyer, described cooling jacket One end is provided with water inlet, and other end is provided with delivery port；The feed end of described conveyer is arranged on the underface of blanking device；
Described flue gas purification system by flue gas inlet tube, gas-distribution pipe, bagroom, spray absorber, packed tower, remove mist Device, adsorption tanks and blower fan composition, described flue gas inlet tube is two, is respectively communicated to the low-temperature flue gas of low-temperature flue gas outlet Pipe and the high-temperature flue gas pipe being communicated to high-temperature flue gas outlet, described low-temperature flue gas pipe and high-temperature flue gas pipe are equipped with regulation Valve；The port of export of low-temperature flue gas pipe and high-temperature flue gas pipe is all communicated to gas-distribution pipe, and described gas-distribution pipe is provided with temperature sensor And emergency valve；The gas-distribution pipe port of export is communicated to bagroom import, and bagroom outlet is to spray-absorption tower flue gas Import；Spray absorber exhanst gas outlet is communicated to packed tower gas approach, and packed tower exhanst gas outlet is communicated to demister flue gas and enters Mouthful；Demister exhanst gas outlet is communicated to fan inlet, and fan outlet is communicated to adsorption tanks import, and adsorption tanks outlet is connected with exhaust Chimney；It is provided with grug feeding jar between described spray absorber and packed tower, bottom described grug feeding jar, be provided with dosing pump, dosing pump The outlet port of export is arranged on spray absorber and packed tower inner tip, if the described dosing pump outlet port of export is provided with Dry spray head；Described adsorption tanks are filled with activated carbon；
Being equipped with safety valve on described drying rotary kiln and high temperature rotary kiln, the thickness of the middle filler of described packed tower is 1.5-2m, in described adsorption tanks, the thickness of the activated carbon of filling is 1.5-1.8m, and the height of described adsorption tanks is its diameter At least 5 times, the quantity of described adsorption tanks is 2-6, and adjacent two adsorption tanks connect by way of " series connection ", adsorption tanks The bulk density of middle activated carbon is 0.65t/m3, described demister uses mesh mist eliminator, is equipped with anti-in mesh mist eliminator Mist filler, the laying depth of antifog filler is 0.5-0.8m, described preheating and drying system and Thermal desorption system and horizontal direction Angle be 1-10 degree.
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