CN207591610U - Flue gas during smelting cleaning system - Google Patents
Flue gas during smelting cleaning system Download PDFInfo
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- CN207591610U CN207591610U CN201721513155.0U CN201721513155U CN207591610U CN 207591610 U CN207591610 U CN 207591610U CN 201721513155 U CN201721513155 U CN 201721513155U CN 207591610 U CN207591610 U CN 207591610U
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Abstract
The utility model discloses a kind of flue gas during smelting cleaning systems, bad for specific flue gas during smelting treatment effect in the prior art to solve the problems, such as.The system is used for the processing of Flue Gas of Nonferrous Smelting, including sequentially connected sulfur trioxide removal unit, high temperature fume dust removal unit, gas cooling and receives arsenic unit and sulfur dioxide relieving haperacidity unit；The sulfur trioxide removal unit exports the first pending gas for having sloughed sulfur trioxide for receiving Flue Gas of Nonferrous Smelting；The high temperature fume dust removal unit exports the second pending gas for having sloughed dust for receiving the first pending gas；The gas cooling and receipts arsenic unit are for receiving the described second pending gas, and then arsenic trioxide has been sloughed in output and third pending gas of the temperature still more than vapor dew-point temperature；The sulfur dioxide relieving haperacidity unit obtains sulfuric acid product for receiving the pending gas of third.
Description
Technical field
The utility model is related to flue gas during smelting purification techniques fields, and technique and smelting are purified in particular to flue gas during smelting
Refine flue gas purification system.
Background technology
The Flue Gas of Nonferrous Smelting that non-ferrous metal metallurgy generates such as copper blast furnace off-gas, lead-zinc smelting flue gas, troilite smelt cigarette
Gas etc., not only temperature is high but also contains sulfur dioxide, sulfur trioxide, arsenic trioxide, vapor and dust.In these substances,
Some has recovery value, and (such as sulfur dioxide, which can be used for Sulphuric acid, arsenic trioxide, can be used as smelting arsenic alloy and manufacture
The raw material of semiconductor), some meetings damage to equipment (such as sulfur trioxide with vapor with reference to and temperature change when generate acid
Moisture condensation leads to corrosion of piping), some meetings lead to environmental pollution (such as dust emission).
Ideal situation is that multiple ingredients therein are targetedly located respectively by a set of flue gas purifying technique
Reason is utilized valuable substance, reduces process operation in the process to the harm of equipment, reduction disposal of pollutants.But by
Often there is the physics and chemical property of differentiation in different ingredients, it is therefore, net designed by for specific flue gas during smelting
Chemical industry skill and reach or be extremely not easy close to above-mentioned perfect condition.
At present, it is for above-mentioned Flue Gas of Nonferrous Smelting mainly using wet cleaning technique, i.e., directly rapid by spray desuperheating
The Flue Gas of Nonferrous Smelting of high temperature is reduced to less than 150 DEG C by cold mode.During this, arsenic trioxide can either be allowed to sublimate
It is precipitated, while promotes sour moisture condensation again, the sludge that will finally obtain being mixed with arsenic trioxide, waste acid and dust as a result,.Above-mentioned is wet
The sludge that method purification technique will not only obtain being not easy to subsequent processing, while arsenic trioxide cannot be recycled effectively and in the presence of acid
The problem of dewing corrosion pipeline.
Utility model content
The purpose of this utility model is to provide flue gas during smelting purification technique and flue gas during smelting cleaning systems, existing to solve
Have and the problem of specific flue gas during smelting treatment effect is bad is directed in technology.
To achieve these goals, one side according to the present utility model provides a kind of flue gas during smelting purification technique.
The technique is used for the processing of Flue Gas of Nonferrous Smelting generated to non-ferrous metal metallurgy, and step includes：A, by temperature for 320 DEG C with
The upper and Flue Gas of Nonferrous Smelting containing sulfur dioxide, sulfur trioxide, arsenic trioxide, vapor and dust is passed through sulfur trioxide
Removal unit makes the sulfur trioxide in the Flue Gas of Nonferrous Smelting by mainly by hydroxide in sulfur trioxide removal unit
The absorption for the powdery absorbent that any one or a few substance is formed in magnesium, calcium hydroxide, magnesia and calcium oxide, then from three
Sulfur oxide removal unit exports the first pending gas for having sloughed sulfur trioxide；B, the described first pending gas is maintained at
Temperature is passed through high temperature fume dust removal unit in the state of being higher than the de-sublimation temperature of arsenic trioxide, in high temperature fume dust removal unit
The dust in the described first pending gas is made then to have been sloughed by solid and gas separating treatment from the output of high temperature fume dust removal unit
Second pending gas of dust；C, the described second pending gas is passed through gas cooling and receives arsenic unit, in gas cooling
And make below the described second pending gas cooling to the de-sublimation temperature of arsenic trioxide in receipts arsenic unit and make precipitation of sublimating
Then arsenic trioxide has been sloughed arsenic trioxide and temperature by solid and gas separating treatment from gas cooling and the unit output of receipts arsenic
The pending gas of third still more than vapor dew-point temperature；D, the pending gas of the third is passed through sulfur dioxide system
Acid unit makes the pending gas of the third be absorbed by absorbing liquid in sulfur dioxide relieving haperacidity unit, so as to pass through two
Sulfur oxide relieving haperacidity unit obtains sulfuric acid product.
To achieve these goals, one side according to the present utility model provides another flue gas during smelting purification work
Skill.The technique is for the processing to the flue gas during smelting containing sulfur trioxide, arsenic trioxide, vapor and dust, step
Including：A, the flue gas during smelting that temperature is 320 DEG C or more is passed through sulfur trioxide removal unit, made in sulfur trioxide removal unit
Sulfur trioxide in flue gas during smelting is by mainly by any one in magnesium hydroxide, calcium hydroxide, magnesia and calcium oxide or several
Kind of substance forms the absorption of powdery absorbent, then from the output of sulfur trioxide removal unit sloughed the first of sulfur trioxide treat from
Process gases；B, by the described first pending gas be maintained at temperature higher than arsenic trioxide de-sublimation temperature in the state of be passed through height
Warm flue gas ash removal unit, make in high temperature fume dust removal unit the dust in the described first pending gas by solid and gas separation at
Then reason has sloughed the second pending gas of dust from the output of high temperature fume dust removal unit；C, by the described second pending gas
Body is passed through gas cooling and receives arsenic unit, makes the described second pending gas cooling to three oxygen in gas cooling and receipts arsenic unit
Change below the de-sublimation temperature of two arsenic and the arsenic trioxide for the precipitation that makes to sublimate be by solid and gas separating treatment, then from gas cooling and
Receive the pending gas of third that arsenic trioxide has been sloughed in the output of arsenic unit；Needed for d, being carried out to the pending gas of the third
Subsequent processing.
Further, in above-mentioned several flue gas during smeltings purification technique, the sulfur trioxide removal unit uses a kind of use
In make powdery absorbent under fluidized state with the catalytic fluidized-bed reactor of sulfur trioxide in Flue Gas of Nonferrous Smelting.
Further, in above-mentioned several flue gas during smeltings purification technique, the high temperature fume dust removal unit includes using
The high-temperature flue gas filter that component carries out the particulate matter in gas to be filtered physics interception is filtered, which has
The particle content filtered in gas is controlled in 10mg/Nm3Following filter efficiency.
Further, in above-mentioned several flue gas during smeltings purification technique, the high-temperature flue gas filter is resistant to using one kind
The operating temperature received can be ensured that high-temperature flue gas filter of the temperature of the second pending gas of output at 250 DEG C or more.
Further, in above-mentioned several flue gas during smeltings purification technique, it is ensured that containing in the first pending gas
It states powdery absorbent and the powdery absorbent can be attached to the table of the filter element with the filtering of the first pending gas
Face.This makes it possible to the cake layer when containing powdery absorbent with filtering protective effect is formed on the surface of filter element.
Further, in above-mentioned several flue gas during smeltings purification technique, in the sulfur trioxide removal unit and high temperature cigarette
Powdered rubber circulation loop is established between air filter, so as to be inhaled by the powdered rubber that high-temperature flue gas filter intercepts as powder
The component for receiving agent returns to sulfur trioxide removal unit.
Further, in above-mentioned several flue gas during smeltings purification technique, the step C specifically includes following steps：C1, general
Arsenic system is received in the cooling that the second pending gas is passed through gas cooling and receives in arsenic unit, to the in arsenic system is received in cooling
Two pending gases are cooled down and the arsenic trioxide of precipitation are enable to pass through the separation of gravitational settling solid and gas, are then received from cooling
The intermediate gas of arsenic trioxide is tentatively sloughed in the output of arsenic system；C2, the intermediate gas is passed through to gas cooling and receives arsenic list
Receipts arsenic filtration system in member, arsenic trioxide in intermediate gas is made in receiving arsenic filtration system by filter element physics
It intercepts and is able to solid and gas separation, then from the receipts arsenic filtration system output pending gas of third.
Further, in above-mentioned several flue gas during smeltings purification technique, from the gas cooling and the output of arsenic unit will be received
The pending gas of third temperature control at 120-150 DEG C.
To achieve these goals, one side according to the present utility model additionally provides a kind of flue gas during smelting purification system
System.The system is used for the processing of Flue Gas of Nonferrous Smelting, including sequentially connected sulfur trioxide removal unit, high temperature fume dust removal
Unit, gas cooling and receipts arsenic unit and sulfur dioxide relieving haperacidity unit；The sulfur trioxide removal unit is used to receive temperature
For 320 DEG C or more and containing the Flue Gas of Nonferrous Smelting of sulfur dioxide, sulfur trioxide, arsenic trioxide, vapor and dust, and
Make the sulfur trioxide in the Flue Gas of Nonferrous Smelting by mainly by appointing in magnesium hydroxide, calcium hydroxide, magnesia and calcium oxide
The absorption of powdery absorbent that the one or more of substances of meaning are formed, and then export the first pending gas for having sloughed sulfur trioxide
Body；The high temperature fume dust removal unit be used to receiving temperature be maintained above arsenic trioxide de-sublimation temperature it is first pending
Gas, and make the dust in the described first pending gas by solid and gas separating treatment, and then export and sloughed the second of dust
Pending gas；The gas cooling and arsenic unit is received for receiving the described second pending gas, make described second pending
Below gas cooling to the de-sublimation temperature of arsenic trioxide and the arsenic trioxide for the precipitation that makes to sublimate is by solid and gas separating treatment, into
And arsenic trioxide has been sloughed in output and third pending gas of the temperature still more than vapor dew-point temperature；The dioxy
Change sulphur relieving haperacidity unit for receiving the pending gas of third, and the pending gas of the third is made to be absorbed by absorbing liquid,
And then obtain sulfuric acid product.
To achieve these goals, one side according to the present utility model additionally provides another flue gas during smelting purification
System.The system is for the processing to the flue gas during smelting containing sulfur trioxide, arsenic trioxide, vapor and dust, packet
It includes sequentially connected sulfur trioxide removal unit, high temperature fume dust removal unit and gas cooling and receives arsenic unit；Three oxygen
Change sulphur removal unit and be used to receiving temperature and be 320 DEG C or more of flue gas during smelting, and make sulfur trioxide in the flue gas during smelting by
To the powdery absorbent mainly formed by any one or a few substance in magnesium hydroxide, calcium hydroxide, magnesia and calcium oxide
Absorption, and then export and sloughed the first pending gas of sulfur trioxide；The high temperature fume dust removal unit is used to receive temperature
Degree is maintained above the first pending gas of the de-sublimation temperature of arsenic trioxide, and makes the powder in the described first pending gas
Dirt is exported the second pending gas for having sloughed dust by solid and gas separating treatment；The gas cooling and receipts arsenic unit
For receiving the described second pending gas, make below the described second pending gas cooling to the de-sublimation temperature of arsenic trioxide
And the arsenic trioxide for the precipitation that makes to sublimate is by solid and gas separating treatment, and then exports and sloughed arsenic trioxide and need to carry out follow-up
The pending gas of third of processing.
Further, in above-mentioned several flue gas during smelting cleaning systems, the sulfur trioxide removal unit uses a kind of use
In make powdery absorbent under fluidized state with the catalytic fluidized-bed reactor of sulfur trioxide in Flue Gas of Nonferrous Smelting.
Further, in above-mentioned several flue gas during smelting cleaning systems, the high temperature fume dust removal unit includes using
Filter the high-temperature flue gas filter that component carries out the particulate matter in gas to be filtered physics interception.
Further, in above-mentioned several flue gas during smelting cleaning systems, the high-temperature flue gas filter has can be by mistake
Particle content in air filtration body is controlled in 10mg/Nm3Following filter efficiency.
Further, in above-mentioned several flue gas during smelting cleaning systems, the high-temperature flue gas filter is resistant to using one kind
The operating temperature received can be ensured that high-temperature flue gas filter of the temperature of the second pending gas of output at 250 DEG C or more.
Further, in above-mentioned several flue gas during smelting cleaning systems, the filter element of the high-temperature flue gas filter
Surface is provided with the filtering of the first pending gas and is attached to the surface of the filter element, the filter cake containing powdery absorbent
Layer.
Further, in above-mentioned several flue gas during smelting cleaning systems, the sulfur trioxide removal unit and high-temperature flue gas
Connection, which is formed, between filter can make to be returned by component of the powdered rubber that high-temperature flue gas filter intercepts as powdery absorbent
The powdered rubber circulation loop of sulfur trioxide removal unit.
The above-mentioned flue gas during smelting purification technique and flue gas during smelting cleaning system of the utility model, by the way that sulfur trioxide is removed
Unit, high temperature fume dust removal unit and gas cooling and receipts arsenic unit carry out organic assembling, at least bring following beneficial to effect
Fruit：
First, two are aoxidized for 320 DEG C or more and at least containing sulfur trioxide, 3 to temperature by sulfur trioxide removal unit
When the flue gas during smelting of arsenic, vapor and dust is handled, magnesium hydroxide and/or calcium hydroxide in powdery absorbent and/
Or magnesia and/or calcium oxide have been demonstrated to effectively to absorb sulfur trioxide at such high temperatures (when containing dioxy in flue gas during smelting
When changing sulphur, but not sulfur dioxide absorption), so as to fulfill effective removing of sulfur trioxide, avoid sulfur trioxide and vapor knot
It closes and acid moisture condensation is led to the problem of when following temperature changes and leads to corrosion of piping；Also, due to flue gas during smelting tapping temperature
It is natively very high, sulfur trioxide removal unit is purified into technique in the above-mentioned flue gas during smelting of the utility model and flue gas during smelting purifies
Forward setting in system just also utilizes the temperature of flue gas during smelting in itself.
Secondly, by high temperature fume dust removal unit to the in the state of de-sublimation temperature of the temperature higher than arsenic trioxide
When one pending gas is handled, the dust (generally further including powdery absorbent at this time) in the first pending gas will be from
(so as to which the first pending gas transition be made to be the second pending gas for sloughing dust) is separated in one pending gas, by
In the second pending gas be the relatively low gas of particle content, by gas cooling and receive arsenic unit to second pending gas
After being cooled down and recycling the arsenic trioxide of precipitation of sublimating, the higher arsenic trioxide of purity can be obtained.
In addition, when the high temperature fume dust removal unit includes carrying out the particulate matter in gas to be filtered using filter element
During the high-temperature flue gas filter that physics intercepts, especially the high-temperature flue gas filter also has the particulate matter that will have been filtered in gas
Content is controlled in 10mg/Nm3In the case of following filter efficiency, it is ensured that it is to ensure high-temperature flue gas mistake that filter element, which is not easy to plug,
The key of filter stable operation, and filter element surface sweating is an important factor for filter element is caused to be blocked.But due to
Powdery absorbent is introduced in sulfur trioxide removal unit, typically, a part of powder can be carried secretly in the first pending gas
The surface that absorbent and these powdery absorbents also will gradually be attached to filter element with the filtering of the first pending gas, this
Sample, also just contain in the cake layer formed on the surface of filter element a certain amount of magnesium hydroxide and/or calcium hydroxide and/
Or magnesia and/or calcium oxide, filter element table (is prevented as one kind using the surface sweating for playing the role of preventing filter element
The measure of face moisture condensation is adhered to one layer of magnesium hydroxide, calcium hydroxide, magnesia or calcium oxide on the surface of filter element and is had been demonstrated
It is effective).
The utility model is described further with reference to the accompanying drawings and detailed description.The utility model is additional
Aspect and advantage will be set forth in part in the description, and partly will become apparent from the description below.Or pass through this practicality
Novel practice is recognized.
Description of the drawings
The attached drawing for forming the part of the utility model is used for assisting understanding to the utility model, provided in attached drawing
Content and its related explanation in the utility model can be used for explaining the utility model, but do not form to the utility model not
Work as restriction.In the accompanying drawings：
Fig. 1 is a kind of schematic diagram of flue gas during smelting cleaning system of the utility model.
Specific embodiment
Clear, complete explanation is carried out to the utility model below in conjunction with the accompanying drawings.Those of ordinary skill in the art based on
The utility model will be realized in the case of these explanations.Before being illustrated with reference to attached drawing to the utility model, spy is needed
It is not pointed out that：
Technical solution and technical characteristic in the utility model provided in each section including the description below,
In the case of not conflicting, these technical solutions and technical characteristic can be combined with each other.
In addition, involved in the description below to the utility model embodiment be generally only one branch of the utility model reality
Example is applied, instead of all the embodiments.Therefore, based on the embodiment in the utility model, those of ordinary skill in the art are not having
All other embodiments obtained under the premise of creative work are made, should all belong to the model of the utility model protection
It encloses.
About term in the utility model and unit.The specification and claims of the utility model and related part
In term " comprising " and its any deformation, it is intended that cover non-exclusive include.Unit " mg/Nm3" mean " milligram
Per standard cubic meter ".Term " filter cake ", refers to the solid matter for being filtered out by filter element and being attached to filter element surface.
Fig. 1 is a kind of schematic diagram of flue gas during smelting cleaning system of the utility model.As shown in Figure 1, the flue gas during smelting is net
Change system is used for the processing to the flue gas during smelting 210 containing sulfur trioxide, arsenic trioxide, vapor and dust, including
Sequentially connected sulfur trioxide removal unit 110, high temperature fume dust removal unit 120 and gas cooling and receipts arsenic unit 130.Its
In：
The sulfur trioxide removal unit 110 is used to receive temperature as 320 DEG C or more of flue gas during smelting 210, and makes described
Sulfur trioxide in flue gas during smelting 210 by mainly by any one in magnesium hydroxide, calcium hydroxide, magnesia and calcium oxide or
The absorption for the powdery absorbent that several substances are formed, and then export the first pending gas 220 for having sloughed sulfur trioxide；
The high temperature fume dust removal unit 120 is used to receive the of the de-sublimation temperature that temperature is maintained above arsenic trioxide
One pending gas 220, and make the dust in the described first pending gas 220 by solid and gas separating treatment, and then export
Slough the second pending gas 230 of dust；
The gas cooling and receipts arsenic unit 130 make described second to wait to locate for receiving the described second pending gas 230
Process gases 230 be cooled to below the de-sublimation temperature of arsenic trioxide and the arsenic trioxide for the precipitation that makes to sublimate by solid and gas separation at
Reason, and then export the pending gas 240 of third sloughed arsenic trioxide and subsequent processing need to be carried out.
In one embodiment of the utility model, sulfur trioxide removal unit 110 employs one kind for making the powder
Last absorbent under fluidized state with the catalytic fluidized-bed reactor 111 of sulfur trioxide in flue gas during smelting 210.Certainly,
In addition to the implementation, sulfur trioxide removal unit 110 can also use the other equipments such as fixed bed reactors.
Fluidized-bed reactor is chemical field commonly used equipment, its specific configuration is repeated no more.But it is to be noted that：One
As for, fluidized-bed reactor 111 can cause output the first pending gas 220 in carry a large amount of solid particles secretly (including not
The powdery absorbent of reaction), this is generally viewed as a defect in previous application scenarios, and the part below this specification
In will mention how will as " defect " be changed into the utility model beneficial effect.
In the above-described embodiments, the high temperature fume dust removal unit 120 specifically employs a kind of high-temperature flue gas filter
121, filter element is installed in the high-temperature flue gas filter 121 and is blocked so as to carry out physics to the particulate matter in gas to be filtered
It cuts.High-temperature flue gas filter 121 is the prior art, but with other high temperature fume dust removal technology (such as electric precipitation, cyclone dust removal) phases
Than often there is higher efficiency of dust collection, so as to ensure the higher purity of the arsenic trioxide that subsequent recovery obtains.
It is proposed with herein by the high-temperature flue gas filter of applicant's offer of the utility model, to ensure high-temperature flue gas
Filter 121 reaches can be by the particle content stability contorting filtered in gas in 10mg/Nm3Following filter efficiency.This
The high-temperature flue gas filter that the applicant of utility model provides can also even control the particle content filtered in gas
In 5mg/Nm3Hereinafter, it will further ensure that the purity for the arsenic trioxide that subsequent recovery obtains in this way.
In above-described embodiment, the gas cooling and receipts arsenic unit 130 are received arsenic system 131 and are received arsenic and filter system by cooling
System 132 is formed.Wherein, cooling receives arsenic system 131 for receiving the described second pending gas 230, to the second pending gas
Body 230 carries out cooling and reaches the de-sublimation temperature of arsenic trioxide hereinafter, and making the arsenic trioxide being precipitated in cooling procedure
Solid and gas is able to by gravitational settling to detach, and then export the intermediate gas through tentatively sloughing arsenic trioxide again.
More specifically, in this embodiment, the cooling receipts arsenic device that arsenic system 131 employs more series connection is received in cooling
131a.Arsenic device 131a is received in the cooling has a cylinder and the taper expansion chamber positioned at the cylinder body bottom, is set in the inner barrel
One piece of central partition plate is equipped with so as to which the cylinder to be divided into the top setting of the left and right two chambers of lower part conducting, wherein left chamber
There is air inlet, exhaust outlet is provided at the top of right chamber；In addition, the lower end of taper expansion chamber is equipped with ash discharging hole.
According to the flow direction of the second pending gas 230, a cooling of foremost receive the air inlet of arsenic device 131a (for
Convenient for description, the gas for being prepared to enter into and coming into the air inlet that arsenic device 131a is received in the cooling is referred to as the second pending gas
Body 230) it is connect with the gas exhaust port of filtering of high-temperature flue gas filter 121, a rearmost cooling receives arsenic device 131a's
Exhaust outlet (for ease of description, the gas that the cooling is received to the exhaust outlet discharge of arsenic device 131a is known as intermediate gas) is with receiving arsenic filtering
System 132 connects, and more coolings are then sequentially connected in series between receiving arsenic device 131a.
Cooling down the operation principle of receipts arsenic device 131a is：It is first after the second pending gas 230, which enters cooling, receives arsenic device 131a
First moved from top to bottom in left chamber, then at the upper end of taper expansion chamber deflecting enter right chamber and in right chamber by
Under up move, in above-mentioned motion process, heat exchange occurs for the outer wall that the second pending gas 230 receives arsenic device 131a with cooling simultaneously
It is gradually cooled, and the arsenic trioxide solid particle being precipitated then is fallen into taper expansion chamber.
Certainly, the exclusive architecture that it is cooling receipts arsenic device that the cooling used in above-described embodiment, which receives arsenic device 131a not being, ability
Field technique personnel are fully able to receive arsenic device using the existing or special other coolings of design based on same purpose.
It is described receive arsenic filtration system 132 for receive the intermediate gas and make arsenic trioxide in intermediate gas by
The physics of filter element intercepts and is able to solid and gas separation, and then exports the pending gas 240 of third.By receiving arsenic filtration system
132 can realize the recycling to arsenic trioxide solid particle higher efficiency.
In the above-described embodiments, it receives arsenic filtration system 132 and specifically employs a kind of bag filter 132a.Certainly, the reality
It is the unique selection for receiving arsenic filtration system to apply the bag filter 132a used in example not being, and those skilled in the art are based on similary
Purpose be fully able to using the other smoke filters of existing or special design.
The technological principle of sulfur trioxide, " SO are absorbed about powdery absorbent3Removing sulfuldioxide experimental study, Chen Xiaolu etc. are moved
Clear, complete explanation has been carried out in power engineering journal, the 12nd phase of volume 34, in December, a 2014 " text.Therefore, pass through this article
Offering disclosure can illustrate, the utility model can effectively remove flue gas during smelting 210 by sulfur trioxide removal unit 110
In sulfur trioxide.
In above-described embodiment, it is ensured that the regenerability of filter element (passes through certain technology in high-temperature flue gas filter 121
Means enable the ability of filter element Reusability, and current main technological means is reverse gas cleaning) it is that technical solution is able to
The important requirement preferably implemented.By a variety of factors such as in smelting furnace fluctuation of operating conditions, flue gas during smelting containing unstable material
It influences, it is one of the problem of most fearness encounters in high-temperature flue gas filter operational process that moisture condensation occurs on filter element surface, once
Moisture condensation, which occurs, will cause filter element surface to form thick tamper, and then reverse gas cleaning is caused to fail.
However, the utility model it has been found that due to introduced in sulfur trioxide removal unit 110 powder absorb
Agent, typically, in the first pending gas 220 can also carry a part of powdery absorbent secretly and these powdery absorbents also will be with
The filtering of first pending gas 220 and the surface for being gradually attached to filter element, in this way, the surface in filter element is formed
Cake layer in also just contain a certain amount of magnesium hydroxide and/or calcium hydroxide and/or magnesia and/or calcium oxide, and this
A little substances will play the role of similar " drier ", can avoid the surface sweating of filter element to a certain extent, in addition, this
A little substances also are able to the influence that filter element surface acid condenses to filter element in prevention high-temperature flue gas filter 121.
And the fluidized-bed reactor 111 used in above-described embodiment, it can to press from both sides in the first pending gas 220 of output
With a large amount of solid particles (including unreacted powdery absorbent), although increasing the operation of high-temperature flue gas filter 121 in this way
Load (amount of the solid particle of processing is larger) still, is also easier in the cake layer for ensureing to be formed on the surface of filter element
Contain magnesium hydroxide and/or calcium hydroxide and/or magnesia and/or calcium oxide.
The magnesium hydroxide and/or calcium hydroxide and/or magnesia and/or the amount of calcium oxide that fluidized-bed reactor 111 uses,
It is calculated according to the amount of sulfur trioxide to be absorbed, and increase that can be appropriate (for example can fully absorb sulfur trioxide
On the basis of be further added by the volume of 5-20%), so as to further improve what is contained in the cake layer formed on the surface of filter element
Magnesium hydroxide and/or the ratio of calcium hydroxide and/or magnesia and/or calcium oxide.
Since the water imbibition of calcium oxide, magnesia is stronger, and it can effectively prevent filter house in high-temperature flue gas filter 121
The influence that part surface acid condenses to filter element, therefore, the utility model is in magnesium hydroxide, calcium hydroxide, magnesia and oxidation
Preferred calcium oxide, magnesia in calcium.
In order to more fully be utilized to the powdery absorbent for entering high-temperature flue gas filter 121, above-described embodiment
In flue gas during smelting cleaning system, between fluidized-bed reactor 111 and high-temperature flue gas filter 121 having also set up powdered rubber follows
Loop back path, so that anti-as the component return fluid bed of powdery absorbent by the powdered rubber that high-temperature flue gas filter 121 intercepts
Answer device 111.
Specifically, as shown in Figure 1, the ash discharging hole of 121 bottom of high-temperature flue gas filter passes through return line 123 and fluidisation
Bed reactor 111 connects, and is gradually collected in 121 operational process of high-temperature flue gas filter in 121 bottom of high-temperature flue gas filter
Powdered rubber (including the powdered rubber being detached from by reverse gas cleaning from the filter element surface of high-temperature flue gas filter 121) it is logical
The return line 123 is crossed as the component of powdery absorbent and returns to fluidized-bed reactor 111.In this way, above-mentioned powdered rubber
In unreacted magnesium hydroxide and/or calcium hydroxide and/or magnesia and/or calcium oxide will be fully used.
In addition, as shown in Figure 1, fluidized-bed reactor 111 and high-temperature flue gas filter 121 have been also connected with ash cellar 122, with reality
The residue in fluidized-bed reactor 111 and high-temperature flue gas filter 121 is now output to ash cellar 122.
The flue gas during smelting cleaning system of above-described embodiment is particularly suitable for the Flue Gas of Nonferrous Smelting of non-ferrous metal metallurgy generation
Processing.Flue Gas of Nonferrous Smelting such as copper blast furnace off-gas, lead-zinc smelting flue gas, the troilite flue gas during smelting that non-ferrous metal metallurgy generates
Deng not only temperature is high but also contains sulfur dioxide, sulfur trioxide, arsenic trioxide, vapor and dust.Using above-described embodiment
Flue gas during smelting cleaning system after, sulfur dioxide can be recycled and for relieving haperacidity, the arsenic trioxide of high-purity can also be obtained.
One embodiment below the utility model will use the flue gas during smelting cleaning system of above-described embodiment, to realize
The processing of copper blast furnace off-gas.The copper blast furnace off-gas temperature is 350 DEG C or more, and mainly contains sulfur dioxide, sulfur trioxide, three oxygen
Change two arsenic, vapor and dust, the purification processing step of the copper blast furnace off-gas is included：
A, the copper blast furnace off-gas is passed through sulfur trioxide removal unit, the copper smelting is made in sulfur trioxide removal unit
Sulfur trioxide in refining flue gas is absorbed by the powdery absorbent mainly formed by calcium oxide, is then removed from sulfur trioxide single
The first pending gas of sulfur trioxide has been sloughed in member output；
B, the described first pending gas is maintained in a state that temperature is 300 DEG C or more and is passed through high temperature fume dust removal list
Member makes the dust in the described first pending gas by solid and gas separating treatment, then from height in high temperature fume dust removal unit
Warm flue gas ash removal unit output particle content 10mg/Nm3The second following pending gas；
C, the second pending gas that temperature is 280 DEG C or more is passed through gas cooling and receives arsenic unit, in gas cooling
And arsenic trioxide that the described second pending gas cooling and making is made to sublimate precipitation in arsenic unit is received by solid and gas separating treatment,
Then from gas cooling and the pending gas of third that arsenic trioxide has been sloughed in the output of arsenic unit and temperature is 120-150 DEG C is received
(mainly sulfur dioxide, particle content 10mg/Nm3Below)；
D, the pending gas of the third is passed through sulfur dioxide relieving haperacidity unit (not shown), in sulfur dioxide relieving haperacidity
The pending gas of the third is made to be absorbed by absorbing liquid in unit, so as to obtain sulfuric acid by sulfur dioxide relieving haperacidity unit
Product.
It is further preferred that in the technique of above-described embodiment, the first of sulfur trioxide removal unit output is pending
Gas contains calcium oxide, and these calcium chloride powder are attached to the table of the filter element with the filtering of the first pending gas
Therefore calcium oxide, is contained in face in the cake layer on filter element surface.
The related content of the utility model is illustrated above.Those of ordinary skill in the art are based on these explanations
In the case of will realize the utility model.The above based on the utility model, those of ordinary skill in the art are not having
All other embodiments obtained under the premise of creative work are made, should all belong to the model of the utility model protection
It encloses.
Claims (10)
1. flue gas during smelting cleaning system, for the processing of Flue Gas of Nonferrous Smelting, it is characterised in that：Including sequentially connected three oxidations
Sulphur removal unit, high temperature fume dust removal unit, gas cooling and receipts arsenic unit and sulfur dioxide relieving haperacidity unit；Three oxidation
Sulphur removal unit for receive temperature for more than 320 DEG C and contain sulfur dioxide, sulfur trioxide, arsenic trioxide, vapor with
And the Flue Gas of Nonferrous Smelting of dust, and make the sulfur trioxide in the Flue Gas of Nonferrous Smelting by mainly by magnesium hydroxide, hydrogen-oxygen
The absorption of powdery absorbent that any one or a few substance is formed in change calcium, magnesia and calcium oxide, and then export and sloughed
First pending gas of sulfur trioxide；The high temperature fume dust removal unit is maintained above arsenic trioxide for receiving temperature
De-sublimation temperature the first pending gas, and make dust in the described first pending gas by solid and gas separating treatment, into
And export the second pending gas for having sloughed dust；The gas cooling and receipts arsenic unit are pending for receiving described second
Gas, makes below the described second pending gas cooling to the de-sublimation temperature of arsenic trioxide and three oxidations two of the precipitation that makes to sublimate
Arsenic by solid and gas separating treatment, and then export sloughed arsenic trioxide and temperature still more than vapor dew-point temperature the
Three pending gases；The sulfur dioxide relieving haperacidity unit is used to receive the pending gas of third, and make the third pending
Gas is absorbed by absorbing liquid, and then obtains sulfuric acid product.
2. flue gas during smelting cleaning system as described in claim 1, it is characterised in that：The sulfur trioxide removal unit uses one
Kind for make powdery absorbent under fluidized state with the catalytic fluidized-bed reaction of sulfur trioxide in Flue Gas of Nonferrous Smelting
Device.
3. flue gas during smelting cleaning system as described in claim 1, it is characterised in that：The high temperature fume dust removal unit includes adopting
The high-temperature flue gas filter of physics interception is carried out to the particulate matter in gas to be filtered with filter element.
4. flue gas during smelting cleaning system as claimed in claim 3, it is characterised in that：The high-temperature flue gas filter has and can incite somebody to action
The particle content filtered in gas is controlled in 10mg/Nm3Following filter efficiency.
5. flue gas during smelting cleaning system as claimed in claim 3, it is characterised in that：The high-temperature flue gas filter is using a kind of
Tolerable operating temperature can be ensured that filtering high-temperature flue gas of the temperature of the second pending gas of output at 250 DEG C or more
Device.
6. flue gas during smelting cleaning system as claimed in claim 3, it is characterised in that：The filter house of the high-temperature flue gas filter
The surface of part is provided with the filtering of the first pending gas and is attached to the surface of the filter element, containing powdery absorbent
Cake layer.
7. flue gas during smelting cleaning system, for the flue gas during smelting containing sulfur trioxide, arsenic trioxide, vapor and dust
Processing, it is characterised in that：Including sequentially connected sulfur trioxide removal unit, high temperature fume dust removal unit and gas cooling
And receive arsenic unit；The sulfur trioxide removal unit is used to receive temperature as 320 DEG C or more of flue gas during smelting, and makes the smelting
Sulfur trioxide in flue gas is by mainly by any one or a few object in magnesium hydroxide, calcium hydroxide, magnesia and calcium oxide
The absorption for the powdery absorbent that matter is formed, and then export the first pending gas for having sloughed sulfur trioxide；The high-temperature flue gas
Dust removing units are used to receive the first pending gas of the de-sublimation temperature that temperature is maintained above arsenic trioxide, and make described the
Dust in one pending gas is exported the second pending gas for having sloughed dust by solid and gas separating treatment；It is described
Gas cooling and receipts arsenic unit make the described second pending gas cooling to three oxidations for receiving the described second pending gas
Below the de-sublimation temperature of two arsenic and the arsenic trioxide for the precipitation that makes to sublimate is by solid and gas separating treatment, and then exports and sloughed three oxygen
Change two arsenic and the pending gas of third of subsequent processing need to be carried out.
8. flue gas during smelting cleaning system as claimed in claim 7, it is characterised in that：The high temperature fume dust removal unit includes adopting
The high-temperature flue gas filter of physics interception is carried out to the particulate matter in gas to be filtered with filter element.
9. flue gas during smelting cleaning system as claimed in claim 8, it is characterised in that：The filter house of the high-temperature flue gas filter
The surface of part is provided with the filtering of the first pending gas and is attached to the surface of the filter element, is absorbed containing the powder
The cake layer of agent.
10. flue gas during smelting cleaning system as claimed in claim 8, it is characterised in that：The sulfur trioxide removal unit and height
Connection is formed and can be made by group of the powdered rubber that high-temperature flue gas filter intercepts as powdery absorbent between warm smoke filter
Divide the powdered rubber circulation loop for returning to sulfur trioxide removal unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721513155.0U CN207591610U (en) | 2017-11-14 | 2017-11-14 | Flue gas during smelting cleaning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721513155.0U CN207591610U (en) | 2017-11-14 | 2017-11-14 | Flue gas during smelting cleaning system |
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| Publication Number | Publication Date |
|---|---|
| CN207591610U true CN207591610U (en) | 2018-07-10 |
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| CN201721513155.0U Active CN207591610U (en) | 2017-11-14 | 2017-11-14 | Flue gas during smelting cleaning system |
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| Country | Link |
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| CN (1) | CN207591610U (en) |
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2017
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