CN211358371U - Smelt flue gas system acid equipment and gas cleaning device thereof - Google Patents
Smelt flue gas system acid equipment and gas cleaning device thereof Download PDFInfo
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- CN211358371U CN211358371U CN201921814532.3U CN201921814532U CN211358371U CN 211358371 U CN211358371 U CN 211358371U CN 201921814532 U CN201921814532 U CN 201921814532U CN 211358371 U CN211358371 U CN 211358371U
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Abstract
The utility model relates to a smelting flue gas acid making equipment and a flue gas purification device thereof, wherein, the flue gas purification device comprises a shell, an electrostatic dust collection area, an adsorption area and a filtration area which are arranged in the shell and are sequentially communicated with an air inlet of the shell, and the bottom of the shell is provided with an ash bucket; the device also comprises a spraying device used for spraying the activated carbon to the adsorption area; the electrostatic dust collection area comprises an anode plate and a cathode wire, a filter bag is arranged in the filter area, and the anode plate, the cathode wire and the filter bag are all made of high-temperature-resistant alloy. The acid making process by smelting flue gas can be simplified, the integral structure can be simplified, the occupied area can be reduced, and the economical efficiency can be improved.
Description
Technical Field
The utility model relates to a flue gas system sour and flue gas treatment technical field, concretely relates to smelt flue gas system sour equipment and gas cleaning device thereof.
Background
In recent years, the atmospheric environmental pollution, the acid rain problem and the heavy metal pollution problem of China are more and more serious, the life quality of the masses of people is seriously influenced, and the great loss is caused to the national economy. Pollution source analysis shows that the method is one of the important sources of the atmospheric pollutants in China caused by nonferrous metal smelting. Therefore, the country has come out of a plurality of policy and regulations for improving the quality of the atmospheric environment and has tightened emission limits of non-ferrous metal smelting pollutants including smoke dust, sulfur dioxide and the like.
The sulfur dioxide and oxygen in the non-ferrous metal smelting flue gas are the main raw materials in the acid making process. However, the non-ferrous metal smelting flue gas also contains a large amount of dust and some other impurities, which are harmful to the acid making process. These impurities must be removed to a predetermined level by a cleaning process.
In the prior art, the purification process of smelting flue gas is a wet purification process, and the flue gas is cooled by a heat exchange device, sequentially passes through an electric dust remover, a primary washing device, a packed tower, a secondary washing device, a primary electric demisting device and a secondary electric demisting device, and then is dried by a drying device to be subjected to subsequent catalytic conversion devices and absorption devices. And before catalytic conversion, the temperature of the catalyst needs to be raised to the activity temperature of the catalyst through a heat exchange device, so that the process is complex, the equipment is more, the occupied area is large, and the cost is higher.
Therefore, how to simplify the acid making process by smelting flue gas, simplify the whole structure, reduce the occupied area and improve the economy is a technical problem to be solved urgently by technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a smelt flue gas system acid equipment and gas cleaning device thereof can simplify and smelt flue gas system acid technology, simplify overall structure, reduces area, improves economic nature.
In order to solve the technical problem, the utility model provides a flue gas purification device, which comprises a shell, an electrostatic dust collection area, an adsorption area and a filtering area, wherein the electrostatic dust collection area, the adsorption area and the filtering area are arranged in the shell and are sequentially communicated with an air inlet of the shell; the spraying device is used for spraying the activated carbon to the adsorption area; the electrostatic dust collection area comprises an anode plate and a cathode wire, a filter bag is arranged in the filter area, and the anode plate, the cathode wire and the filter bag are all made of high-temperature-resistant alloy.
The flue gas is when this electrostatic precipitator district, can desorption its inside mixed have electrostatic load and the great dust of granule, and when the flue gas is when passing through the adsorption zone time, the active carbon that injection apparatus jetted can adsorb impurity such as arsenic trioxide in the flue gas, improves the purity of post-processing acid, and to the fine dust of granule, can be got rid of after filtering through the filter bag in the filtering zone, and the flue gas after the dust removal of above-mentioned three dust removal district can be followed the export of filter bag and discharged.
Wherein, the material of anode plate, negative pole line and filter bag is high temperature resistant alloy, can bear higher temperature, so set up, can make this gas cleaning device can be high-efficient, the operation reliably under the high temperature (if more than 400 ℃) operating mode, and then make it directly remove dust to the high temperature flue gas to go on thoroughly getting rid of through the granule etc. of three dust removal district difference to different impurity in the flue gas, different particle diameters, dust collection efficiency can reach more than 99%.
Specifically, the exhaust gas temperature of smelting furnace is about 800 ℃, and this flue gas lets in the gas cleaning device and removes dust after the cooling of one-level heat transfer device, because gas cleaning device can move under the high temperature operating mode, consequently, the temperature of one-level heat transfer device export flue gas can directly be controlled more than 400 ℃ to it is less to make this one-level heat transfer device's the import and export gas temperature difference. Because the flue gas dust concentration is larger, the erosion abrasion of the heat exchange tubes is more serious, so that the quantity of the heat exchange tubes arranged under high dust concentration can be reduced by reducing the temperature difference between the inlet and the outlet of the primary heat exchange device, the hidden danger of abrasion and burst of the heat exchange tubes is reduced, and the resistance of a system can be greatly reduced.
Moreover, after the flue gas is dedusted by the flue gas purification device, the dedusting effect is good, the flue gas can be directly introduced into the catalytic conversion device for catalytic conversion, complex equipment and process are not needed for treatment, the purity of the acid preparation can be ensured, the overall structure of the system can be effectively simplified, the occupied area is reduced, the on-site arrangement is convenient, and meanwhile, the investment, operation and maintenance cost can be greatly reduced. After the flue gas dedusted by the flue gas purification device is introduced into the catalytic conversion device in the absorption section, sulfur dioxide in the flue gas is oxidized to generate sulfur trioxide under the action of the catalyst, and because the temperature of the flue gas dedusted by the flue gas purification device is above 400 ℃, the temperature is just the active temperature of the catalyst, and at the temperature, the conversion rate of the sulfur dioxide in the flue gas is greatly improved.
Optionally, the ash bucket comprises a first ash bucket arranged below the electrostatic dust collection area and a second ash bucket arranged below the filtering area; and a vibrating screen is also arranged in the second ash hopper and used for collecting the activated carbon.
Optionally, the dust collector further comprises a conveying component connected between the vibrating screen and the spraying device and used for recovering the activated carbon adsorbed with dust to the spraying device.
Optionally, the dust collector further comprises a surface modification device communicated with the conveying component and used for activating the activated carbon adsorbed with dust.
Optionally, the vibrating screen is a linear vibrating screen, a circular swinging screen or an electric grading vibrating screen; the surface modification device is a multi-layer activation furnace, a flowing layer activation furnace or a rotary activation furnace.
Optionally, the spraying device comprises a plurality of nozzles arranged in the adsorption zone at intervals along the height direction, and each nozzle is arranged towards the filtering zone.
Optionally, the housing further includes a connecting section communicated between the air inlet and the electrostatic dust removal area, and the connecting section is in a gradually expanding structure from outside to inside.
In addition, the utility model also provides a device for producing acid by smelting flue gas, which comprises a purification section, an absorption section and a tail gas section which are arranged in sequence; the purification section comprises a primary heat exchange device and the flue gas purification device which are sequentially arranged; the absorption section comprises a catalytic conversion device and an absorption device, sulfur dioxide in the flue gas can be oxidized in the catalytic conversion device to generate sulfur trioxide, and the absorption device is used for absorbing the sulfur trioxide to form acid; the tail gas workshop section comprises a desulfurization reaction tower and a wet electric dust collector which are sequentially communicated.
The technical effect of the smelting flue gas acid making equipment with the flue gas purification device is similar to that of the flue gas purification device, and is not repeated herein for saving space.
Optionally, the absorption section comprises a primary catalytic conversion device, a secondary heat exchange device, a primary absorption device, a secondary catalytic conversion device and a secondary absorption device which are arranged in sequence; the system is characterized by further comprising a third-stage heat exchange device, wherein the third-stage heat exchange device can heat the inlet flue gas subjected to the second-stage catalytic conversion to a first preset temperature, and can lower the outlet flue gas temperature subjected to the second-stage catalytic conversion to a second preset temperature.
Optionally, the primary heat exchange device and the secondary heat exchange device are both waste heat boilers.
Drawings
FIG. 1 is a process flow diagram of a smelting flue gas acid making device provided by the embodiment of the utility model;
fig. 2 is a schematic structural view of the flue gas cleaning apparatus of fig. 1.
In FIGS. 1-2, the reference numbers are illustrated as follows:
100-a purification section, 110-a primary heat exchange device and 120-a flue gas purification device;
200-an absorption section, 210-a primary catalytic conversion device, 220-a secondary heat exchange device, 230-a primary absorption device, 240-a secondary catalytic conversion device, 250-a secondary absorption device and 260-a tertiary heat exchange device;
300-a tail gas working section, 310-a desulfurization reaction tower and 320-a wet electric dust collector;
400-smelting furnace;
500-chimney;
1-shell, 11-air inlet, 12-connecting section;
2-an electrostatic dust removal area;
3-an adsorption zone;
4-filtration zone, 41-filter bag;
51-a first ash bucket, 52-a second ash bucket;
6-spraying device, 61-nozzle;
7-vibrating screen;
8-a conveying member;
9-surface modification device.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1-2, fig. 1 is a process flow diagram of a smelting flue gas acid making device provided by an embodiment of the present invention; fig. 2 is a schematic structural view of the flue gas cleaning apparatus of fig. 1.
The embodiment of the utility model provides a copper lead zinc smelting acid making equipment and flue gas purification device 120 thereof, as shown in figure 1, the copper lead zinc smelting acid making equipment comprises a purification working section 100, an absorption working section 200 and a tail gas working section 300 which are arranged in sequence, wherein the purification working section 100 comprises a primary heat exchange device 110 and a flue gas purification device 120 which are arranged in sequence; the absorption section 200 comprises a catalytic conversion device and an absorption device, sulfur dioxide in the flue gas can be oxidized in the catalytic conversion device to generate sulfur trioxide, and the absorption device is used for absorbing the sulfur trioxide to form acid; the tail gas section 300 includes a desulfurizing tower and a wet electric dust collector 320 which are sequentially communicated.
Specifically, as shown in fig. 2, the flue gas purification device 120 includes a housing 1, and three dedusting areas, i.e., an electrostatic dedusting area 2, an adsorption area 3, and a filtering area 4, which are disposed in the housing 1 and sequentially communicated with an air inlet 11 of the housing 1, wherein flue gas enters the housing 1 through the air inlet 11 and then sequentially passes through the three dedusting areas, and an ash bucket is disposed at the bottom of the housing 1 and is used for collecting dust removed from the flue gas in each dedusting area. Specifically, an anode plate and a cathode wire are arranged in the electrostatic dust collection area 2, the flue gas purification device 120 further comprises a spraying device 6 capable of spraying activated carbon into the adsorption area 3, and a filter bag 41 is arranged in the filter area 4.
In detail, when the flue gas passes through the electrostatic dust collection area 2, the flue gas can be removed, the internal mixed dust with electrostatic load and large particles can be removed, when the flue gas passes through the adsorption area 3, the activated carbon sprayed by the spraying device 6 can adsorb impurities such as arsenic trioxide in the flue gas, the purity of the post-production acid is improved, the fine dust particles can be removed after being filtered by the filter bag 41 in the filter area 4, and finally the flue gas after being dedusted by the three dust collection areas can be discharged along the outlet of the filter bag 41.
Wherein, the material of anode plate, negative pole line and filter bag 41 is high temperature resistant alloy, can bear higher temperature, so set up, can make this gas cleaning device 120 can be high-efficient, the operation reliably under the high temperature (if more than 400 ℃) operating mode, and then make it directly remove dust to the high temperature flue gas to thoroughly get rid of through the granule etc. of three dust removal district difference to different impurity in the flue gas, different particle sizes, dust collection efficiency can reach more than 99%.
Specifically, the flue gas temperature of smelting furnace 400 exhaust is about 800 ℃, and this flue gas lets in the gas cleaning device 120 after the cooling of one-level heat transfer device 110 and removes dust, because the gas cleaning device 120 that this embodiment provided can move under the high temperature operating mode, consequently, the temperature of one-level heat transfer device 110 export flue gas can directly be controlled more than 400 ℃ to make this one-level heat transfer device 110's the import and export flue gas difference in temperature less. Because the flue gas dust concentration is larger, the erosion abrasion of the heat exchange tubes is more serious, so the temperature difference between the inlet and the outlet of the primary heat exchange device 110 is reduced, the number of the heat exchange tubes arranged under high dust concentration is reduced, the hidden danger of abrasion and burst of the heat exchange tubes is reduced, and the resistance of the system can be greatly reduced.
Moreover, after the flue gas is dedusted by the flue gas purification device 120, the dedusting effect is good, the flue gas can be directly introduced into the catalytic conversion device for catalytic conversion, complex equipment and process are not needed for treatment, the purity of the acid production can be ensured, the overall structure of the system can be effectively simplified, the occupied area is reduced, the on-site arrangement is convenient, and meanwhile, the investment, operation and maintenance cost can be greatly reduced. After the flue gas dedusted by the flue gas purification device 120 is introduced into the catalytic conversion device in the absorption section 200, sulfur dioxide in the flue gas is oxidized to generate sulfur trioxide under the action of the catalyst, and because the temperature of the flue gas dedusted by the flue gas purification device 120 is above 400 ℃, the temperature is just the activity temperature of the catalyst, and at the temperature, the conversion rate of sulfur dioxide in the flue gas is greatly improved.
The desulfurized flue gas passes through the desulfurization reaction tower 310 and the wet electric precipitator 320 again to remove the residual sulfur in the flue gas, and the flue gas is further purified by removing dust, acid mist, water drops, smell and the like mixed in the flue gas through the wet electric precipitator 320 and finally discharged to the atmosphere through the chimney 500.
In the above embodiment, as shown in fig. 2, the dust hoppers include a first dust hopper 51 disposed below the electrostatic dust collection area 2 and a second dust hopper 52 disposed below the filter area 4, that is, the dust hoppers below the electrostatic dust collection area 2 and the filter area 4 are separately disposed, specifically, the number of the first dust hoppers 51 and the number of the second dust hoppers 52 are not limited, and may be the same or different, specifically, the number of the first dust hoppers and the number of the second dust hoppers are set according to the size of the electrostatic dust collection area 2 and the size of the filter area 4.
Wherein, still be equipped with shale shaker 7 in the second ash bucket 52 for collect the active carbon that adsorbs there is the dust, can get rid of the large granule dust in the flue gas in electrostatic precipitator district 2, and the filter bag 41 in filtering area 4 can get rid of the dust of the tiny granule in the flue gas, and adsorb the active carbon that has impurity, after filter bag 41 filters, the outer wall that filter bag 41 can be stayed to the dust of tiny granule and active carbon and fall to the second ash bucket 52 in, shale shaker 7 can be with the active carbon that adsorbs there is impurity and the dust separation of tiny granule and collect the active carbon. The activated carbon is convenient to recover and reuse, and the economical efficiency is improved.
In the above embodiment, the flue gas purification device 120 further includes the conveying component 8, and the conveying component 8 is connected between the vibrating screen 7 and the injection device 6, and is used for recycling the activated carbon collected by the vibrating screen 7 into the injection device 6 for reuse, so that the recycling rate of the activated carbon is improved, and the economy is good.
Further, this gas cleaning device 120 still includes surface modification device 9, and this surface modification device 9 sets up with transportation part intercommunication for the active carbon that adsorbs impurity that collects vibrating screen 7 carries out surface modification, and the activity of reply active carbon guarantees its adsorption effect.
The vibrating screen 7 in this embodiment may be any of a linear vibrating screen 7, a circular swinging screen, an electric grading vibrating screen 7, and the like, the surface modification device 9 may be any of a multilayer activation furnace, a fluidized bed activation furnace, a rotary activation furnace, and the like, and the conveying component 8 may be a conveying belt, a pipe belt, or a pneumatic conveying, and none of them is specifically limited.
In this embodiment, through the setting of shale shaker 7, conveying part 8 and surface modification device 9 for activated carbon makes it can reuse, and can guarantee its adsorption effect, need not additionally to set up the device in order to transport activated carbon, surface modification, storage etc. can simplify overall structure, and economic nature is good.
In the above embodiment, the injection device 6 includes a plurality of nozzles 61, each nozzle 61 is arranged in the adsorption area 3 along the height direction interval to fully contact with the flue gas from different height directions, ensure to completely remove impurities in the flue gas, and each nozzle 61 is arranged towards the filtering area 4, so that the activated carbon sprayed by the injection device 6 can enter the filtering area 4 under the driving of the flue gas and fall into the second ash bucket 52 under the action of gravity, so as to collect the activated carbon. In addition, the nozzle 61 is arranged towards the filtering area 4, which means that the nozzle 61 is arranged towards the downstream direction of the flue gas, and the situation that dust particles in the flue gas enter the nozzle 61 to block the nozzle 61 is avoided.
In the above embodiment, casing 1 still includes the toper section, this toper section communicates between air inlet 11 and electrostatic precipitator district 2, and be by outer to interior gradually expanding structure, wherein, indicate the outer one side of casing 1 outward, indicate one side in the casing 1 in, so set up, make the flue gas can spread rapidly owing to the volume grow after getting into casing 1, in order to slow down the velocity of flow of flue gas, avoid the flue gas to cause the impact to anode plate and the negative pole line in the electrostatic precipitator district 2, still be favorable to the large granule dust interception in the flue gas fully of anode plate and negative pole line simultaneously, improve dust removal effect.
In the above embodiment, in the acid making equipment using smelting flue gas, the absorption section 200 includes a first-stage catalytic conversion device 210, a second-stage heat exchange device 220, a first-stage absorption device 230, a second-stage catalytic conversion device 240, and a second-stage absorption device 250, which are sequentially arranged, and meanwhile, the absorption section 200 further includes a third-stage heat exchange device 260, and the third-stage heat exchange device 260 can heat the inlet flue gas of the second-stage catalytic conversion to a first preset temperature, and can cool the outlet flue gas of the second-stage catalytic conversion to a second preset temperature. The first preset temperature refers to the active temperature of the catalyst in the catalytic conversion reaction, and the second preset temperature refers to the flue gas temperature required by the gas inlet 11 of the secondary absorption device 250 when the catalyst is introduced into the secondary absorption device 250 after the reaction, which has the same function as the secondary heat exchange device 220, so that the performance requirements on the absorption devices (the primary absorption device 230 and the secondary absorption device 250) can be reduced after the temperature of the flue gas is reduced.
The flue gas after being dedusted by the flue gas purification device 120 is subjected to a two-stage acid making process, wherein the one-stage acid making process means that the dedusted flue gas enters a one-stage catalytic conversion device 210 to enable sulfur dioxide in the flue gas to undergo an oxidation reaction to generate sulfur trioxide, and the sulfur trioxide is absorbed by a one-stage absorption device 230, so that part of the sulfur dioxide contained in the flue gas is removed and the one-stage acid making process is completed; then the flue gas enters a secondary catalytic conversion device 240, sulfur dioxide in the flue gas is subjected to oxidation reaction to generate sulfur trioxide, and the sulfur trioxide is absorbed by a secondary absorption device 250, so that part of sulfur dioxide contained in the flue gas is removed and a secondary acid making process is completed.
Moreover, after the flue gas dedusted by the flue gas purification device 120 reacts in the primary catalytic conversion device 210 and exchanges heat in the secondary heat exchange device 220, the secondary heat exchange device 220 is under a dust-free working condition, so that the wear to internal heat exchange components is small, the system resistance is small, the absorption efficiency of the primary absorption device 230 can be improved, further more positive influence is generated on subsequent working sections, the heat exchange requirement of the tertiary heat exchange device 260 can be reduced, the consumption of the catalyst of the secondary catalytic conversion device 240 is reduced, and the absorption efficiency of the secondary absorption device 250 is further improved.
Further, in this embodiment, one-level heat transfer device 110 and second grade heat transfer device 220 are exhaust-heat boiler, so set up can be when cooling down the high temperature flue gas, and make full use of heat energy avoids heat to run off, improves economic benefits.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The flue gas purification device is characterized by comprising a shell (1), and an electrostatic dust removal area (2), an adsorption area (3) and a filtering area (4) which are arranged in the shell (1) and sequentially communicated with an air inlet (11) of the shell (1), wherein an ash hopper is arranged at the bottom of the shell (1);
also comprises a spraying device (6) used for spraying the activated carbon to the adsorption zone (3);
the electrostatic dust collection area (2) comprises an anode plate and a cathode wire, a filter bag (41) is arranged in the filter area (4), and the anode plate, the cathode wire and the filter bag (41) are all made of high-temperature-resistant alloy.
2. The flue gas purification device according to claim 1, wherein the ash hopper comprises a first ash hopper (51) arranged below the electrostatic dust collection zone (2) and a second ash hopper (52) arranged below the filtering zone (4); and a vibrating screen (7) is also arranged in the second ash bucket (52) and is used for collecting the activated carbon.
3. The flue gas cleaning device according to claim 2, further comprising a conveying member (8) connected between the vibrating screen (7) and the injection device (6) for recycling the activated carbon with adsorbed dust to the injection device (6).
4. A flue gas cleaning device according to claim 3, further comprising a surface modification device (9) communicating with the conveying member (8) for activating the activated carbon adsorbed with dust.
5. The flue gas purification device according to claim 4, wherein the vibrating screen (7) is a linear vibrating screen (7), a circular rocking screen or an electric classifying vibrating screen (7); the surface modification device (9) is a multi-layer activation furnace, a flowing layer activation furnace or a rotary activation furnace.
6. A flue gas cleaning device according to any one of claims 2 to 5, wherein the injection means (6) comprises a plurality of nozzles (61) arranged in the adsorption zone (3) at intervals in the height direction, and each nozzle (61) is arranged towards the filtration zone (4).
7. The flue gas purification device according to any one of claims 1 to 5, wherein the housing (1) further comprises a connecting section (12) communicated between the air inlet (11) and the electrostatic dust removal area (2), and the connecting section (12) is of a gradually expanding structure from outside to inside.
8. The smelting flue gas acid making equipment is characterized by comprising a purification working section (100), an absorption working section (200) and a tail gas working section (300) which are sequentially arranged;
the purification section (100) comprises a primary heat exchange device (110) and a flue gas purification device (120) according to any one of claims 1 to 7 which are arranged in sequence;
the absorption section (200) comprises a catalytic conversion device in which sulfur dioxide in the flue gas can be oxidized to generate sulfur trioxide, and an absorption device for absorbing the sulfur trioxide to form acid;
the tail gas working section (300) comprises a desulfurization reaction tower (310) and a wet electric dust collector (320) which are sequentially communicated.
9. The metallurgical off-gas acid making equipment according to claim 8, wherein the absorption section (200) comprises a primary catalytic conversion device (210), a secondary heat exchange device (220), a primary absorption device (230), a secondary catalytic conversion device (240) and a secondary absorption device (250) which are arranged in sequence;
the system is characterized by further comprising a three-stage heat exchange device (260), wherein the three-stage heat exchange device (260) can heat the inlet flue gas subjected to the secondary catalytic conversion to a first preset temperature, and can lower the outlet flue gas temperature subjected to the secondary catalytic conversion to a second preset temperature.
10. The metallurgical off-gas acid making equipment according to claim 9, wherein the primary heat exchange device and the secondary heat exchange device are both waste heat boilers.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921814532.3U CN211358371U (en) | 2019-10-25 | 2019-10-25 | Smelt flue gas system acid equipment and gas cleaning device thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921814532.3U CN211358371U (en) | 2019-10-25 | 2019-10-25 | Smelt flue gas system acid equipment and gas cleaning device thereof |
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| CN211358371U true CN211358371U (en) | 2020-08-28 |
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