CN114849419B - Method and device for removing sulfur trioxide through transformation, purification and treatment of sulfur dioxide flue gas - Google Patents
Method and device for removing sulfur trioxide through transformation, purification and treatment of sulfur dioxide flue gas Download PDFInfo
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- CN114849419B CN114849419B CN202210511916.8A CN202210511916A CN114849419B CN 114849419 B CN114849419 B CN 114849419B CN 202210511916 A CN202210511916 A CN 202210511916A CN 114849419 B CN114849419 B CN 114849419B
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Abstract
The invention discloses a method for removing sulfur trioxide by transforming, purifying and removing sulfur dioxide flue gas and a removing device thereof 3 F, cl, as and dust, and the metal chloride is used As an indicator for flue gas purification to determine the load saturation of the adsorbent in the flue gas purification process, thereby greatly reducing SO in the sulfur dioxide flue gas 3 F, cl, as and dust content, greatly reducing the treatment load of the smelting flue gas washing wastewater, reducing pollution and protecting the environment. The invention has the advantages of simple process, convenient operation and SO 3 Good removing effect, low cost and the like, and is suitable for industrial application of smelting flue gas purification.
Description
Technical Field
The invention belongs to the field of environmental protection, and particularly relates to a method and a device for transforming, purifying and removing sulfur trioxide from sulfur dioxide flue gas.
Background
Metal sulfides such as copper sulfide, lead sulfide, zinc sulfide, iron sulfide, etc. are all pyrogenically produced to contain SO 2 Flue gas of (2), SO in flue gas 2 Is the main raw material for producing the sulfuric acid. SO removal from flue gas generated by smelting metal sulfide 2 In addition, it also contains SO 3 F, cl, as, dust and the like, and the flue gas is sprayed, washed, purified and dedusted before acid making. SO as the flue gas is sprayed and washed 3 F, cl, as and other impurities are continuously dissolved into the spray liquid to make the acidity (H) of the spray liquid 2 SO 4 Concentration) is higher and eventually has to be treated as contaminated acid. At present, dirty acid generated by spraying and washing smelting flue gas is generally treated by a sulfuration-lime neutralization method. The sulfuration is to add sodium sulfide or sodium hydrosulfide into acid wastewater washed by smelting flue gas to precipitate copper, arsenic and the like in the acid wastewater in a sulfide form, and obtain arsenic-containing filter cake and sulfurated liquid after liquid-solid separation; the arsenic-containing filter cake is further treated to comprehensively recover valuable metals such as copper, arsenic and the like, and the vulcanized liquid is added with lime to neutralize to generate gypsum slag. The sulfuric acid-lime neutralization method is effective in treating waste acid generated by smelting flue gas washing, but a large amount of gypsum slag is generated in the treatment process, and the obtained gypsum slag can only be used as an additive in the cement industry reluctantly. In addition, the treated liquid obtained by treating the waste acid by a sulfide-lime neutralization method contains a large amount of saltAnd the reclaimed water can not be recycled, which causes great environmental protection pressure for smelting enterprises.
Disclosure of Invention
In order to solve the problems of the existing smelting flue gas purification process, the invention aims to provide a method and a device for converting, purifying and removing sulfur trioxide from sulfur dioxide flue gas, wherein an Me compound is ingeniously used as an adsorbent for purifying the sulfur dioxide flue gas to remove SO in the flue gas 3 F, cl, as and dust, the environmental protection pressure of flue gas purification is greatly reduced.
In order to achieve the technical purpose, the technical scheme of the invention is as follows:
a method for removing sulfur trioxide by transforming, purifying and converting sulfur dioxide flue gas uses spherical or block-shaped objects containing Me compound as adsorbent for purifying sulfur dioxide flue gas, the adsorbent is placed in a purifying channel of sulfur dioxide flue gas to remove SO in the sulfur dioxide flue gas with the temperature of more than or equal to 125 DEG C 3 F, cl, as and dust, and metal chlorides As an indicator of sorbent loading saturation.
The invention relates to a method for removing sulfur trioxide by transforming and purifying sulfur dioxide flue gas, wherein the sulfur dioxide flue gas is the smelting flue gas of metal sulfide at the temperature of 125-1350 ℃, and the flue gas contains 3-30% of SO 2 Besides, it also contains 0.11-0.55% of SO 3 And small amounts of Cl, F, as and dust.
The invention relates to a method for removing sulfur trioxide by transforming and purifying sulfur dioxide flue gas, wherein Me compounds are selected from at least one of Me oxides, me hydroxides, me carbonates and Me sulfites.
The invention relates to a method for removing sulfur trioxide by transforming and purifying sulfur dioxide flue gas, wherein Me is selected from at least one of metal elements of Ca, mg, sr, ba, mn, fe, co, ni, cu, zn, pb, cd, na and K.
The invention relates to a method for removing sulfur trioxide by transforming and purifying sulfur dioxide flue gas, wherein an adsorbent is a spherical or blocky object which is prepared from Me compound, indicator and adhesive powder through burdening, uniformly mixing, wet-grinding, pelletizing and drying, wherein the particle size of the powder is 5-50 mm, the compressive strength of the powder is 800-1600N, and the particle size of the powder is 50-500 meshes; the indicator is the chloride of Me, and the dosage of the indicator is 0.01 to 1.5 percent of the total amount of the adsorbent; the adhesive is at least one of gypsum and bentonite, and the amount of the adhesive is 0.5-10% of the total amount of the adsorbent; of course, the oxide of Me and the hydroxide of Me also have the function of a binder.
The invention relates to a method for removing sulfur trioxide by transforming and purifying sulfur dioxide flue gas, wherein metal chloride is at least one chloride formed by combining Cl with Ca, mg, sr, ba, mn, fe, co, ni, cu, zn, pb, cd, na and K.
The invention relates to a method for removing sulfur trioxide by transforming, purifying and purifying sulfur dioxide flue gas, wherein the purification of the sulfur dioxide flue gas is completed in a flue gas purification channel, an adsorbent and the sulfur dioxide flue gas are in countercurrent contact in a dynamic and static combined mode, and the contact time of the adsorbent and the sulfur dioxide flue gas is 0.25-5 seconds.
The mechanism of transformation and purification of the sulfur dioxide flue gas is as follows:
MeO+SO 2 ＝MeSO 3
Me(OH) 2 +SO 2 ＝MeSO 3 +H 2 O↑
MeCO 3 +SO 2 ＝MeSO 3 +CO 2 ↑
MeSO 3 +SO 3 ＝MeSO 4 +SO 2 ↑
MeSO 3 +2HF＝MeF 2 +SO 2 ↑+H 2 O↑
MeSO 3 +2HCl＝MeCl 2 +SO 2 ↑+H 2 O↑
MeCl 2 +SO 3 +H 2 O＝MeSO 4 +2HCl↑
it can be seen that, at the temperature of sulfur dioxide flue gas cleaning, the order of the stability of the Me compound is as follows: sulfate > fluoride > chloride > sulfite. The Me chloride is used as indicator for fume purification, and the effective utilization rate of the adsorbent can be improved to the utmost extent.
In addition, by utilizing the stability difference between Me sulfite and sulfate, fluoride and chloride thereof and the stability difference between Me chloride and sulfate thereof and using metal chloride as an indicator for flue gas purification, the sulfite in the adsorbent can be completely converted into sulfate, fluoride and chloride, and SO in the flue gas can be ensured without reducing the content of sulfur dioxide in the flue gas 3 F, cl and As are effectively absorbed, and the flue gas can force the dust in the flue gas to be deeply settled and separated due to the continuous and repeated change of the flowing direction and the flowing speed of the flue gas when passing through the adsorbent material layer, so that the dust content in the flue gas is greatly reduced, and the sulfur dioxide flue gas is purified with multiple effects.
The invention also provides a device for transforming, purifying and removing sulfur trioxide from sulfur dioxide flue gas, which comprises an adsorbent feeding device, a flue gas purification channel, a supporting device and a collecting device for loading adsorbent and smoke dust, wherein a flue gas inlet is arranged on one side of the bottom of the flue gas purification channel, and a purified gas outlet is arranged on one side of the top of the flue gas purification channel to form a purification channel for the flue gas from bottom to top; at least 2 supporting devices are arranged in the flue gas purification channel and are used for supporting an adsorbent material layer; the top end of the flue gas purification channel is provided with an adsorbent feeding device, and the bottom end of the flue gas purification channel is provided with a collection device loaded with adsorbent and smoke dust.
The invention relates to a device for removing sulfur trioxide by transforming, purifying and removing sulfur dioxide flue gas, wherein the cross section of a flue gas purification channel is one of a circle, an ellipse, a rectangle and a regular polygon.
The invention relates to a device for converting, purifying and removing sulfur trioxide from sulfur dioxide flue gas, which comprises a hopper and a bell, wherein a discharge hole of the hopper is connected with an upper port of a flue gas purification channel, the bell is used for opening or closing a connecting port of the hopper and the flue gas purification channel, the bell is provided with an operating rod used for controlling the relative position of the bell and the upper port of the flue gas purification channel, namely, the adsorbent in the hopper is controlled to be added or stopped to be added into the flue gas purification channel by opening or closing the connecting port between the hopper and the flue gas purification channel.
The invention relates to a device for converting, purifying and removing sulfur trioxide from sulfur dioxide flue gas, which comprises a material layer supporting frame, a receiving and releasing device and a vibrator, wherein the material layer supporting frame is formed by connecting two trays with the same shape and size through a hinge shaft, the vibrator is provided with a supporting rod, the upper end of the supporting rod is connected with the hinge shaft of the tray, the receiving and releasing device is provided with two connecting rods, one end of each connecting rod is hinged with a material tray, and the other ends of the two connecting rods can slide up and down on the supporting rod in a controllable manner to realize the expansion or folding of the two trays along the hinge shaft.
According to the device for converting, purifying and removing sulfur trioxide from sulfur dioxide flue gas, the two trays of the material layer supporting frame are of frame structures, a metal wire mesh is laid in each frame to facilitate the flue gas to pass through, and the shape and size of the two frame structures after being hinged are matched with the inner cross section of the flue gas purification channel.
The invention relates to a device for transforming, purifying and removing sulfur trioxide from sulfur dioxide flue gas, wherein temperature detection devices are respectively arranged at a flue gas inlet and a purified gas outlet of a flue gas purification channel, and regulating valves are respectively arranged at the front end of the flue gas inlet and the rear end of the purified gas outlet, so that process control and equipment maintenance are facilitated.
The invention relates to a device for transforming, purifying and removing sulfur trioxide from sulfur dioxide flue gas, wherein flue gas component detection devices are arranged at a flue gas inlet, a purified gas outlet and among various adsorbent material layers, and an online detector containing Cl adjusts the periods of updating and discharging of the adsorbent in real time according to the detection result of the Cl concentration SO as to ensure that SO 3 And the removal rate of F, cl and As is improved, and the effective utilization rate of the adsorbent is improved.
In order to avoid the neutral position of the adsorbent replacing process, the number of adsorbent material layers arranged in the flue gas purification channel is more than or equal to 2, the thickness of the adsorbent material layers is 5-50 cm, and the height of a reserved space between adjacent material layers is based on that the folding of a material layer tray is not hindered. The sulfur dioxide flue gas enters from the flue gas inlet, contacts with the adsorbent at the bottommost layer and then enters from the flue gas inletSequentially contacting with the adsorbent bed layer to adsorb SO therein 3 F, cl and As to be respectively converted into sulfate, fluoride, chloride and the like, and the purified sulfur dioxide flue gas is sent to a sulfuric acid production system. In the flue gas purification process, the adsorbent bed vibrator is continuously or regularly started to remove the smoke dust deposited on the surface of the adsorbent, so that the flue gas is favorably contacted with the adsorbent, and the flowing resistance of the flue gas is reduced.
Compared with the prior art, the invention has the following advantages and effects:
1. the invention skillfully uses spherical or blocky objects containing Me compounds as the adsorbent for the transformation and purification of the sulfur dioxide flue gas, and the adsorbent is placed in the sulfur dioxide flue gas purification channel to absorb SO in the flue gas 3 F, cl and As to be converted into sulfate, fluoride, chloride and the like, and metal chloride is used As an indicator to ensure the purification effect of the sulfur dioxide flue gas.
2. SO of adsorbent in adsorption flue gas 3 F, cl and As can also collect dust in the flue gas, thereby greatly reducing the dust content in the flue gas, and the collected smoke can be directly returned to the smelting system for proportioning, thereby not only improving the recovery rate of valuable metals, but also greatly reducing the load of treating the washing wastewater of the smelting flue gas, reducing pollution and protecting the environment. The method has the advantages of simple process, convenient operation, and no reduction or slight increase of the content of the sulfur dioxide 3 Good removing effect, low cost and the like, and is suitable for industrial application of smelting flue gas purification.
Drawings
FIG. 1 is a schematic view of a sulfur dioxide flue gas conversion, purification and sulfur trioxide removal device according to the present invention;
the device comprises an adsorbent feeding device 1, an adsorbent feeding device 2, a flue gas purification channel 3, an adsorbent material layer 4, a material layer supporting frame 5, a winding and unwinding device 6, a vibrator 7, a loaded adsorbent and smoke dust collecting device 8, a screen 9, a loaded adsorbent 10 and smoke dust.
Detailed Description
The invention is further described below with reference to the following examples, which are intended to illustrate the invention but not to further limit it.
Example 1
Referring to fig. 1, a preferred apparatus for removing sulfur trioxide from sulfur dioxide flue gas according to the present invention includes a cleaning agent feeding device 1, a flue gas cleaning channel 2, an adsorbent material layer 3, a material layer supporting frame 4, a receiving and releasing device 5, a vibrator 6, and a collection device 7 for loading adsorbent and smoke; a flue gas inlet is arranged on one side of the bottom of the flue gas purification channel 2, and a purified gas outlet is arranged on one side of the top of the flue gas purification channel to form a flue gas purification channel from bottom to top; at least 2 supporting devices are arranged in the flue gas purification channel 2, and an adsorbent material layer 3 is placed on the supporting devices; an adsorbent feeding device 1 is arranged at the top end of the flue gas purification channel 2, and a loaded adsorbent and smoke dust collecting device 7 is arranged at the bottom end of the flue gas purification channel;
the cross section of the flue gas purification channel 2 is one of a circle, an ellipse, a rectangle and a regular polygon;
adsorbent feeding device includes hopper, bell, the discharge gate of hopper links to each other with 2 last ports of gas cleaning passageway, the bell is used for opening or closing hopper and gas cleaning passageway 2's connector, is equipped with an action bars on the bell for control the relative position of bell and gas cleaning passageway 2 last port, through opening or closing the connector between hopper and the gas cleaning passageway 2 promptly, control the adsorbent in the hopper and add or stop to add to gas cleaning passageway 2.
The supporting device comprises a material layer supporting frame 4, a retracting device 5 and a vibrator 6, wherein the material layer supporting frame 4 is formed by connecting two trays with the same shape and size through a hinge shaft, the vibrator 6 is provided with a supporting rod, the upper end of the supporting rod is connected with the hinge shaft of the tray, the retracting device 5 is provided with two connecting rods, one end of each connecting rod is hinged with one tray, and the other ends of the two connecting rods can slide up and down on the supporting rod in a controllable manner to realize the unfolding or folding of the two trays along the hinge shaft;
the two trays of the material layer supporting frame 4 are of frame structures, a metal wire mesh is laid in the frames to facilitate the smoke to pass through, and the shape and the size of the two hinged frame structures which are unfolded are matched with the inner cross section of the smoke purification channel.
Temperature detection devices are arranged at the flue gas inlet and the purified gas outlet of the flue gas purification channel 2, and regulating valves are arranged at the front end of the flue gas inlet and the rear end of the purified gas outlet so as to facilitate process control and equipment maintenance;
the flue gas inlet, the purified gas outlet and the adsorbent material layers are respectively provided with a component detection device, wherein an online detector containing Cl adjusts the period of updating and discharging the adsorbent in real time according to the detection result of Cl concentration, SO as to ensure that SO is discharged 3 And the removal rate of F, cl and As is improved, and the effective utilization rate of the adsorbent is improved. The working principle of the invention is briefly described as follows:
the purifying agent feeding device 1 comprises a bell and a hopper, wherein the bell is lifted and closed, an adsorbent is quantitatively added into the hopper, the bell is put down, the bell is lifted and closed after the adsorbent is released, and the adsorbent is quantitatively added into the hopper for later use.
The purifying agent released by the feeding device 1 enters a cylindrical or square column or polygonal column flue gas purifying channel 2 and is received by a material layer supporting frame 4. The shape and size of the inner section of the material layer support frame 4 are matched with those of the flue gas purification channel 2. The bed of material support frame 4 passes through the hinge by two trays that the shape size is the same and links to each other, feeds and two trays of adsorption process expand and form bed of material support frame 4, hold up the adsorbent bed of material, through receiving and releasing device 5 during row material, fold two trays, let the adsorbent fall down, expand two trays again after the unloading is finished, just so can be in proper order with each adsorbent bed of material 3 in the gas cleaning passageway 2 and be covered with. The foldable tray is made of metal materials into a frame, and a metal wire mesh is laid in the frame so as to facilitate smoke to pass through.
The inlet and the outlet of the flue gas purification channel 2 are both provided with a temperature detection device and a component detection device, and the front end of the inlet and the rear end of the outlet of the flue gas purification channel 2 are provided with regulating valves so as to facilitate process control and equipment maintenance. In order to avoid neutral position in the process of replacing the adsorbent, the number of adsorbent material layers arranged in the flue gas purification channel 2 is more than or equal to 2, the thickness of the adsorbent material layer 3 is 5-50 cm, and the pre-treatment among the material layersThe height of the reserved space is subject to the condition that the folding of the material layer tray is not hindered. The sulfur dioxide flue gas enters from the side surface of the bottom of the flue gas purification channel 2 and is contacted with each adsorbent material layer 3 in sequence to adsorb SO in the flue gas 3 F, cl and As are converted into sulfate, fluoride, chloride and the like respectively, and finally discharged from the side surface of the upper end of the flue gas purification channel 2 to be sent to a sulfuric acid production system. In the flue gas purification process, the vibrator 6 of the adsorbent material layer is continuously or regularly started to remove the smoke dust deposited on the surface of the adsorbent, so that the contact between the flue gas and the adsorbent is facilitated, and the flow resistance of the flue gas is reduced.
The detection devices for the Cl concentration are arranged between the inlet and the outlet of the flue gas purification channel 2 and the adsorbent material layers 3, the period of updating and discharging the adsorbent is adjusted in real time according to the detection result of the Cl concentration, and SO is ensured 3 And the removal rate of F, cl and As is improved, and the effective utilization rate of the adsorbent is improved.
The specific operation is as follows:
when the concentration of Cl in the flue gas on the surface of the adsorbent material layer 3 at the bottommost layer (the last but one layer) of the flue gas purification channel 2 is detected to slightly rise, the adsorbent material at the last but one layer is adsorbed and saturated, the accommodating device 5 at the bottommost layer is started, the supporting frame of the material layer at the bottommost layer is folded downwards, the adsorbent material automatically falls into the collecting device 7 under the action of gravity, and the loaded adsorbent material 9 and the flue gas 10 respectively enter the respective collecting regions after being screened by the screen 8.
After the material of the adsorbent material layer 3 at the bottommost layer is discharged, the bottom adsorbent material layer receiving and releasing device 5 is opened, the material layer supporting frame at the bottommost layer is unfolded and reset, then the material layer supporting frame receiving and releasing device 5 at the penultimate layer is opened, the supporting frame is folded downwards, the adsorbent is automatically moved to the penultimate layer, then the material layer supporting frame is unfolded and reset, the adsorbent is sequentially moved downwards layer by layer, and SO in the flue gas is ensured 3 F, cl, as and dust are effectively removed, the effective utilization rate of the adsorbent is extremely high, and the loss rate of sulfur dioxide in the flue gas purification process is reduced to the minimum.
Example 2
The flow rate is 6500m at 285 deg.C 3 H copper smelting electric dust collection outlet flue gas purification device shown in figure 1Firstly, the flue gas is divided and enters a plurality of parallel flue gas purification channels with the diameter of 1.8m, 3 layers of adsorbents are uniformly placed in the purification channels with the height of 4.5m, the thickness of the material layer of the adsorbents is 50cm, the adsorbents are powder with the grain size of 150-250 meshes, wherein 95-98% of calcium carbonate (containing 1.5% of magnesium carbonate), 1.5-2.5% of calcium oxide, 0.05% of sodium chloride and 1-1.5% of plaster of paris, spherical objects with the compressive strength of 900-1400N and the grain size of 35-45 mm are obtained by batching, uniformly mixing, grinding, pelletizing and drying, the time of the flue gas passing through a purification device from the inlet to the outlet is 1.5 seconds, the operation process of the device adjusts the periods of regeneration and discharge of the adsorbents in real time according to the detection result of the concentration of HCl, the obtained conversion purification result of the sulfur dioxide flue gas is gathered in table 1, wherein the SO is obtained by conversion and purification result is obtained by SO 3 The removal rate of the catalyst reaches 99.52 percent, the removal rate of As is 95.33 percent, the removal rate of HCl is 96.70 percent, the removal rate of HF is 98.48 percent, and the removal rate of dust is 98.93 percent.
TABLE 1 composition of copper smelting fume before and after transformation and purification
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Example 3
Flow rate at 325 deg.C of 3500m 3 The method comprises the steps of firstly shunting the flue gas into a plurality of parallel flue gas purification channels with the diameter of 1.2m, uniformly placing 6 layers of adsorbents in the purification channels with the height of 6m, wherein the thickness of the material layer of the adsorbent is 15cm, the adsorbents are spherical objects with the compressive strength of 950-1410N and the grain diameter of 15-25 mm, which are obtained by proportioning, uniformly mixing, carrying out wet grinding, carrying out pelletizing and drying on 95-98% of dolomite mineral powder (calcium carbonate/magnesium carbonate), 0.1% of calcium chloride powder and 2.5-5% of calcium oxide powder, the time for the flue gas to pass through the purification device from the inlet to the outlet is 1.8 seconds, the purification process timely updates the material layer according to the change of the concentration of HCl, and the obtained conversion purification result of the sulfur dioxide flue gas is gathered in a table 2,wherein SO 3 The removal rate of the catalyst reaches 99.68 percent, the removal rate of As is 94.69 percent, the removal rate of HCl is 99.02 percent, the removal rate of HF is 99.51 percent, and the removal rate of dust is 98.12 percent.
TABLE 2 composition of copper smelting fume before and after transformation and purification
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Example 4
Flow rate of 4600m at a temperature of 230 deg.C 3 The oxidation combustion flue gas produced by acid production from pyrite is purified by the device shown in figure 1, the flue gas is firstly divided into a plurality of parallel channels with the diameter of 1.5m for flue gas purification, 4 layers of adsorbents are evenly placed in the purification channel with the height of 5m, the thickness of the material layer of the adsorbents is 35cm, the adsorbents are spherical objects with the compression strength of 750-1280N and the grain diameter of 25-35 mm, which are obtained by mixing, evenly mixing, grinding, balling and drying 90-95% of siderite ore powder (ferrous carbonate), 5-7.5% of ferrous oxide powder, 0.5% of ferrous chloride powder and 1.5-2% of bentonite powder, the flue gas takes 1.6 seconds from the inlet to the outlet of the purification device, the adsorbent material layer is timely updated according to the concentration change of HCl in the purification process, the obtained conversion purification result of the sulfur dioxide flue gas is gathered in table 3, wherein SO is SO 3 The removal rate of the catalyst reaches 99.63 percent, the removal rate of As is 95.94 percent, the removal rate of HCl is 98.74 percent, the removal rate of HF is 99.68 percent, and the removal rate of dust is 98.51 percent.
TABLE 3 composition before and after transformation and purification of oxidized combustion flue gas from pyrite production
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Claims (6)
1. A method for removing sulfur trioxide by transforming, purifying and removing sulfur dioxide flue gas uses spherical or block-shaped objects containing Me compound as adsorbent for purifying sulfur dioxide flue gas, the adsorbent is placed in a purifying channel of sulfur dioxide flue gas to remove SO in the sulfur dioxide flue gas with the temperature of more than or equal to 125 DEG C 3 F, cl, as and dust, and using metal chloride As an indicator of the loading saturation of the adsorbent; the Me compound is at least one selected from Me oxide, me hydroxide, me carbonate and Me sulfite;
the method is implemented by adopting the following device, the device comprises an adsorbent feeding device, a flue gas purification channel, a supporting device and a collecting device for loading adsorbent and smoke dust, wherein a flue gas inlet is arranged at one side of the bottom of the flue gas purification channel, and a purified gas outlet is arranged at one side of the top of the flue gas purification channel to form a purification channel for the flue gas from bottom to top; at least 2 supporting devices are arranged in the flue gas purification channel, and an adsorbent material layer is placed on the supporting devices; an adsorbent feeding device is arranged at the top end of the flue gas purification channel, and a loaded adsorbent and smoke dust collecting device are arranged at the bottom end of the flue gas purification channel;
the adsorbent is a spherical or blocky object with the particle size of 5-50mm and the compressive strength of 800-1600N, which is prepared from powder of a Me compound, an indicator and an adhesive through material preparation, uniform mixing, wet grinding, pelletizing and drying, wherein the particle size of the powder is 50-500 meshes; the indicator is chloride of Me, and the dosage of the indicator is 0.01-1.5% of the total amount of the adsorbent; the adhesive is selected from at least one of gypsum and bentonite, and the dosage of the adhesive is 0.5 to 10 percent of the total amount of the adsorbent;
the adsorbent feeding device comprises a hopper and a bell, a discharge hole of the hopper is connected with an upper port of the flue gas purification channel, the bell is used for opening or closing a connecting port between the hopper and the flue gas purification channel, an operating rod is arranged on the bell and used for controlling the relative position of the bell and the upper port of the flue gas purification channel, namely, the adsorbent in the hopper is controlled to be added or stopped to be added into the flue gas purification channel by opening or closing the connecting port between the hopper and the flue gas purification channel; the supporting device comprises a material layer supporting frame, a retracting device and a vibrator, wherein the material layer supporting frame is formed by connecting two trays with the same shape and size through a hinge shaft, a supporting rod is arranged on the vibrator, the upper end of the supporting rod is connected with the hinge shaft of the tray, the retracting device is provided with two connecting rods, one end of each connecting rod is hinged with one material tray, and the other ends of the two connecting rods can slide up and down on the supporting rod in a controllable manner, so that the two trays can be unfolded or folded along the hinge shaft; the vibrator continuously or regularly vibrates in the flue gas purification process to remove the smoke dust deposited on the surface of the adsorbent, so that the contact between the flue gas and the adsorbent is facilitated, and the flowing resistance of the flue gas is reduced; when the concentration of Cl in the flue gas on the surface of the lowest-layer adsorbent material layer of the flue gas purification channel is detected to slightly rise, indicating that the adsorbent of the last but one layer is adsorbed and saturated, starting the lowest-layer retractor, folding the lowest-layer material layer support frame downwards, enabling the adsorbent to automatically fall into a collecting device under the action of gravity, and respectively entering the loaded adsorbent and the flue gas into respective collecting regions after being screened by a screen;
after the adsorbent bed at the bottommost layer is discharged, the bottom adsorbent bed retracting device is started, the bed supporting frame at the bottommost layer is unfolded and reset, then the bed supporting frame retracting device at the penultimate layer is started, the supporting frame is folded downwards, the adsorbent is automatically moved to the penultimate layer, then the bed supporting frame is unfolded and reset, and the adsorbent is sequentially moved downwards layer by layer.
2. The method for converting, purifying and removing sulfur trioxide from sulfur dioxide flue gas as claimed in claim 1, is characterized in that: the sulfur dioxide flue gas is smelting flue gas of metal sulfide with the temperature of 125-1350 ℃, and the SO of the flue gas is removed by 3-30 percent 2 In addition, 0.11 to 0.55 percent of SO 3 And small amounts of Cl, F, as and dust.
3. The method for converting, purifying and removing sulfur trioxide from sulfur dioxide flue gas as claimed in claim 1, is characterized in that: me is selected from at least one of metal elements of Ca, mg, sr, ba, mn, fe, co, ni, cu, zn, pb, cd, na and K.
4. The method for converting, purifying and removing sulfur trioxide from sulfur dioxide flue gas as claimed in claim 1, is characterized in that: the indicator is at least one of metal chlorides formed by combining Cl with Ca, mg, sr, ba, mn, fe, co, ni, cu, zn, pb, cd, na and K.
5. The method for converting, purifying and removing sulfur trioxide from sulfur dioxide flue gas as recited in any one of claims 1 to 4, wherein: the sulfur dioxide flue gas purification is completed in a flue gas purification channel, the adsorbent and the sulfur dioxide flue gas are in countercurrent contact in a dynamic and static combined mode, and the contact time of the adsorbent and the sulfur dioxide flue gas is 0.25 to 5 seconds.
6. The method for converting, purifying and removing sulfur trioxide from sulfur dioxide flue gas as claimed in claim 5, characterized in that: temperature detection devices are arranged at the flue gas inlet and the purified gas outlet of the flue gas purification channel, and regulating valves are arranged at the front end of the flue gas inlet and the rear end of the purified gas outlet; flue gas component detection devices are arranged among the flue gas inlet, the purified gas outlet and each adsorbent material layer, and each component detection device comprises an online Cl detector.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02241542A (en) * | 1989-03-14 | 1990-09-26 | Hokkaido Electric Power Co Inc:The | Preparation of exhaust gas treatment agent |
| CN2915235Y (en) * | 2006-06-18 | 2007-06-27 | 江苏一环环保设计研究院 | Highly efficient dry-method desulfurization unit |
| CN111841245A (en) * | 2020-06-22 | 2020-10-30 | 陈利强 | Oppression flap is from dropping formula exhaust treatment device |
| CN113842771A (en) * | 2017-11-14 | 2021-12-28 | 成都易态科技有限公司 | Smelting flue gas purification process |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1261198A (en) * | 1968-11-11 | 1972-01-26 | Wellman Power Gas Inc Formerly | Process for recovery of so2 from waste gases |
| CN109022818B (en) * | 2018-08-22 | 2020-11-06 | 东北大学 | Method for reducing sulfur trioxide concentration in nonferrous smelting flue gas and recovering valuable components |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02241542A (en) * | 1989-03-14 | 1990-09-26 | Hokkaido Electric Power Co Inc:The | Preparation of exhaust gas treatment agent |
| CN2915235Y (en) * | 2006-06-18 | 2007-06-27 | 江苏一环环保设计研究院 | Highly efficient dry-method desulfurization unit |
| CN113842771A (en) * | 2017-11-14 | 2021-12-28 | 成都易态科技有限公司 | Smelting flue gas purification process |
| CN111841245A (en) * | 2020-06-22 | 2020-10-30 | 陈利强 | Oppression flap is from dropping formula exhaust treatment device |
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