CN220696362U - Emission reduction device for smelting flue gas acid making tail gas - Google Patents
Emission reduction device for smelting flue gas acid making tail gas Download PDFInfo
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- CN220696362U CN220696362U CN202322339248.8U CN202322339248U CN220696362U CN 220696362 U CN220696362 U CN 220696362U CN 202322339248 U CN202322339248 U CN 202322339248U CN 220696362 U CN220696362 U CN 220696362U
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- 239000002253 acid Substances 0.000 title claims abstract description 136
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 83
- 239000003546 flue gas Substances 0.000 title claims abstract description 83
- 238000003723 Smelting Methods 0.000 title claims abstract description 46
- 239000007789 gas Substances 0.000 title claims abstract description 41
- 230000009467 reduction Effects 0.000 title claims abstract description 19
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 101
- 238000010521 absorption reaction Methods 0.000 claims abstract description 99
- 238000001035 drying Methods 0.000 claims abstract description 49
- 238000000746 purification Methods 0.000 claims abstract description 24
- 238000006243 chemical reaction Methods 0.000 claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims description 192
- 239000007921 spray Substances 0.000 claims description 61
- 230000007246 mechanism Effects 0.000 claims description 10
- 239000003054 catalyst Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 abstract description 38
- 230000008569 process Effects 0.000 abstract description 30
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 abstract description 24
- 150000001875 compounds Chemical class 0.000 abstract description 10
- 125000004122 cyclic group Chemical group 0.000 abstract description 5
- 230000003647 oxidation Effects 0.000 abstract description 4
- 238000007254 oxidation reaction Methods 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000000945 filler Substances 0.000 description 38
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 16
- 238000005507 spraying Methods 0.000 description 12
- -1 Polyethylene Polymers 0.000 description 9
- 239000002250 absorbent Substances 0.000 description 8
- 230000002745 absorbent Effects 0.000 description 8
- 239000004743 Polypropylene Substances 0.000 description 6
- 229920001155 polypropylene Polymers 0.000 description 6
- 238000012856 packing Methods 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 4
- 239000002274 desiccant Substances 0.000 description 4
- 238000006477 desulfuration reaction Methods 0.000 description 4
- 230000023556 desulfurization Effects 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 239000003595 mist Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical group [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The utility model belongs to the technical field of acid production from flue gas and flue gas treatment, and particularly relates to an emission reduction device for tail gas generated in acid production from smelting flue gas. The smelting flue gas acid making tail gas emission reduction device comprises a purifying tower, a drying tower, a converting tower, a plurality of absorbing towers, a plurality of acid coolers and a plurality of circulating tanks. The treatment process of the device comprises a cyclic purification-drying-conversion-absorption process, and is mainly characterized in that compounds such as sulfur dioxide in the flue gas are absorbed in a two-stage absorption mode, the absorbed flue gas enters a sulfuric acid fan, the absorbed flue gas and gas generated by sulfuric acid oxidation are mixed together, and the generated gas is subjected to purification, drying, conversion, absorption and other processes to finally obtain a high-quality sulfuric acid product, so that emission reduction of harmful gases and compounds such as sulfur dioxide in smelting flue gas is realized, and the purposes of economy, high efficiency and environmental protection are achieved.
Description
Technical Field
The utility model belongs to the technical field of acid production from flue gas and flue gas treatment, and particularly relates to a device for reducing emission of tail gas generated in acid production from smelting flue gas.
Background
Along with the rapid development of the economy and society and the acceleration of the industrialization process, the development of the smelting industry is faster and faster. However, the flue gas generated in the smelting process contains a large amount of harmful gases such as sulfur dioxide, and also contains a large amount of dust and other impurities, which all cause serious environmental pollution problems. Therefore, an effective method is needed to reduce the emission of sulfur dioxide and harmful gases in the smelting flue gas, so as to achieve the purposes of protecting the environment and human health.
In the prior art, the emission of harmful gases, sulfur dioxide and other compounds in smelting flue gas can be reduced by the traditional methods of desulfurization and the like. The purification process of smelting flue gas is mainly wet purification process, and the flue gas is subjected to subsequent catalytic conversion and absorption steps after being subjected to electric dust removal, washing and drying in sequence after being cooled by a heat exchange device.
However, this method has problems such as high construction and operation costs of desulfurization equipment, high energy consumption, large usage of reactants, and the need to discharge a large amount of waste water and waste gas after treatment. Therefore, a more economical, efficient and environment-friendly method for reducing emission of tail gas generated in acid production by smelting flue gas needs to be found.
Disclosure of Invention
Based on the technical problems in the prior art, the utility model provides an emission reduction device for acid making tail gas of smelting flue gas, which sequentially performs the processes of purification, drying, conversion, absorption and the like through circulation so as to realize the emission reduction of harmful gas and sulfur dioxide gas in the smelting flue gas.
Based on the above purpose, the utility model adopts the following technical scheme:
an emission reduction device for acid production tail gas from smelting flue gas comprises a purifying tower, a drying tower, a converting tower, a plurality of absorbing towers, a plurality of acid coolers and a plurality of circulating tanks;
the two absorption towers are respectively a primary absorption tower and a secondary absorption tower; the acid coolers are four, namely a 1# acid cooler, a 2# acid cooler, a 3# acid cooler and a finished product acid cooler; the circulation tanks are three, namely a 1# circulation tank, a 2# circulation tank and a 3# circulation tank;
the smelting flue gas is introduced into the air inlet end of the side wall of the purifying tower through a first air inlet pipe, and the air outlet end at the top of the purifying tower is communicated with the air inlet end of the side wall of the drying tower through a pipeline; the air outlet end at the top of the drying tower is communicated with the bottom of the conversion tower through a pipeline, and the top of the conversion tower is communicated with the air inlet end of the side wall of the primary absorption tower through a pipeline; the air outlet end at the top of the primary absorption tower is communicated with the air inlet end of the side wall of the secondary absorption tower through a pipeline, and the air outlet end at the top of the secondary absorption tower is communicated with the first air inlet pipe through a return pipe;
the liquid outlet end at the bottom of the drying tower is communicated with the liquid inlet end of the 1# circulating groove through a pipeline, the upper side wall of the 1# circulating groove is provided with a first liquid outlet end, and the lower side wall of the 1# circulating groove is provided with a second liquid outlet end;
the first liquid outlet end of the upper side wall of the No. 1 circulating groove is communicated with the liquid inlet end of the side wall of the No. 1 acid cooler through a first liquid outlet pipe; the liquid outlet end of the No. 1 acid cooler is communicated with a drying tower;
the liquid outlet end at the bottom of the primary absorption tower is communicated with the liquid inlet end of a 2# circulating tank through a pipeline, a third liquid outlet end is arranged on the upper side wall of the 2# circulating tank, and a fourth liquid outlet end is arranged on the lower side wall of the 2# circulating tank;
the third liquid outlet end of the upper side wall of the No. 2 circulating groove is communicated with the liquid inlet end of the side wall of the No. 2 acid cooler through a third liquid outlet pipe; the liquid outlet end of the No. 2 acid cooler is communicated with the primary absorption tower;
the liquid outlet end at the bottom of the secondary absorption tower is communicated with the liquid inlet end of the 3# circulating tank through a pipeline, a fifth liquid outlet end is arranged on the upper side wall of the 3# circulating tank, and a sixth liquid outlet end is arranged on the lower side wall of the 3# circulating tank;
the fifth liquid outlet end of the upper side wall of the 3# circulating groove is communicated with the liquid inlet end of the side wall of the 3# acid cooler through a fifth liquid outlet pipe; the liquid outlet end of the No. 3 acid cooler is communicated with the secondary absorption tower;
the second liquid outlet end is connected with a discharge pipe, and the fourth liquid outlet end and the sixth liquid outlet end are communicated with the discharge pipe through pipelines.
Specifically, the purifying tower, the drying tower, the converting tower, the primary absorption tower and the secondary absorption tower are all vertically arranged; the acid cooler 1# is horizontally arranged, the acid cooler 2# is horizontally arranged, the acid cooler 3# is horizontally arranged, and the acid cooler finished product is horizontally arranged.
Further, a sulfuric acid fan is arranged on the first air inlet pipe.
Specifically, a purification spray pipe is arranged in the purification tower, the liquid inlet end of the purification spray pipe extends out of the purification tower and is communicated with a purification liquid storage device arranged outside the purification tower through a pipeline, the purification liquid is dilute sulfuric acid with the concentration of 10 percent,
further preferably, a packing layer is arranged in the purifying tower, and the packing layer is positioned below the purifying spray pipe; the annular filler and the uniform filler are arranged in the filler layer, smelting flue gas enters the purifying tower and contacts with spray liquid falling into the filler layer, the annular filler and the uniform filler can enhance the gas-liquid contact degree and the gas-liquid contact area, wherein the annular filler is circular, the uniform filler is corrugated structured filler, and the annular filler and the uniform filler are made of one of Polyethylene (PE), polypropylene (PP), reinforced polypropylene (RPP) and polyvinyl chloride (PVC); the annular filler and the uniform filler are conventional in the prior art, and the structure, the specification and the like of the annular filler and the uniform filler are not the utility model points of the utility model, so that the description is omitted.
Further, the purifying spray pipe is positioned below the air outlet end of the purifying tower, and the packing layer is positioned above the air inlet end of the purifying tower; the flue gas entering the purifying tower sequentially passes through the adsorption of the filler in the filler layer and the spraying of the purifying spraying pipe, so that pollutants such as particulate matters, sulfuric acid mist and the like in the flue gas are removed.
Further preferably, the sulfuric acid fan is arranged on a pipeline behind the joint of the return pipe and the first air inlet pipe and in front of the air inlet end of the purifying tower, so that new smelting flue gas and absorbed tail gas can be mixed and then enter the purifying tower for circulating treatment, and the treatment efficiency is improved.
Further, a first output pump is arranged at the first liquid outlet end of the No. 1 circulating tank.
Further, be equipped with first shower in the drying tower, outside the feed liquor end of first shower stretched out the drying tower, and the liquid outlet end of 1# sour cooler is linked together with the feed liquor end of first shower through the second drain pipe, and the exit of second drain pipe is equipped with first elevator pump and first valve.
Further, a second output pump is arranged at the third liquid outlet end of the No. 2 circulating tank.
Further, be equipped with the second shower in the first order absorption tower, the feed liquor end of second shower stretches out outside the first order absorption tower, and the liquid outlet end of 2# sour cooler is linked together with the feed liquor end of second shower through the fourth drain pipe, and the exit of fourth drain pipe is equipped with second elevator pump and second valve.
Further, a third output pump is arranged at the fifth liquid outlet end of the 3# circulating tank.
Further, a third spray pipe is arranged in the second-stage absorption tower, the liquid inlet end of the third spray pipe extends out of the second-stage absorption tower, the liquid outlet end of the 3# acid cooler is communicated with the liquid inlet end of the third spray pipe through a sixth liquid outlet pipe, and a third lifting pump and a third valve are arranged at the outlet of the sixth liquid outlet pipe.
Specifically, a plurality of catalyst layers are arranged in the conversion tower, and the catalyst is a vanadium-titanium catalyst, so that the oxidation efficiency can be improved.
Further, the first-stage absorption tower and the second-stage absorption tower are respectively provided with an acid liquor storage mechanism, the acid liquor storage mechanisms are positioned above the second spray pipes and the third spray pipes, and the acid liquor storage mechanisms can downwards spray acid liquor to absorb compounds such as sulfur trioxide in the flue gas by using the acid liquor to generate sulfuric acid.
Further preferably, the upper side wall of the 1# circulating groove is also provided with a seventh liquid outlet end, and the seventh liquid outlet end is communicated with the third liquid outlet pipe through a pipeline; the upper side wall of the No. 2 circulating groove is also provided with an eighth liquid outlet end which is communicated with a fifth liquid outlet pipe through a pipeline.
Further preferably, the second liquid outlet pipe is provided with a first bypass pipe, the first bypass pipe is communicated with the liquid inlet end of the finished sulfuric acid cooler, and the liquid outlet end of the finished sulfuric acid cooler is communicated with the discharge pipe through a pipeline; the fourth liquid outlet pipe is provided with a second bypass pipe, the sixth liquid outlet pipe is provided with a third bypass pipe, and the second bypass pipe and the third bypass pipe are communicated with the first bypass pipe.
Further, based on a general inventive concept, the utility model also provides a flue gas treatment process by using the smelting flue gas acid making tail gas emission reduction device, which comprises the following steps:
1) Under the action of a sulfuric acid fan, smelting flue gas enters the purifying tower through a first air inlet pipe, and then sequentially passes through adsorption of filler in a filler layer and spraying of a purifying spraying pipe, so that pollutants such as particulate matters, sulfuric acid mist and the like in the flue gas are removed;
2) The purified flue gas enters a drying tower, a first lifting pump and a first valve at the outlet of a second liquid outlet pipe are opened at the moment, concentrated sulfuric acid is used as a drying agent to spray from a first spray pipe of a No. 1 acid cooler to enter the drying tower, the flue gas is dried and adsorbed, so that moisture in the flue gas is removed, meanwhile, spray liquid flows into a No. 1 circulating groove from the bottom of the drying tower, and the spray liquid can be circulated to the No. 1 acid cooler for reuse by using a first output pump;
3) The dried flue gas enters a conversion tower, and sulfur dioxide gas in the flue gas is oxidized into sulfur trioxide gas by using a catalyst in the conversion tower;
4) The converted flue gas sequentially enters a first-stage absorption tower and a second-stage absorption tower, acid liquor is sprayed downwards by an acid liquor storage mechanism in the first-stage absorption tower and the second-stage absorption tower, sulfur trioxide and other compounds in the flue gas are absorbed by using the acid liquor to generate sulfuric acid, the sulfuric acid is respectively entered into a 2# circulation tank and a 3# circulation tank, and respectively enter into a 2# acid cooler and a 3# acid cooler, at the moment, a second lifting pump and a second valve at the outlet of a fourth liquid outlet pipe and a third lifting pump and a third valve at the outlet of a sixth liquid outlet pipe can be respectively opened, concentrated sulfuric acid is respectively entered into the first-stage absorption tower and the second-stage absorption tower as an absorbent to absorb the flue gas again, and then respectively enter into the 2# circulation tank and the 3# circulation tank from the first-stage absorption tower and the second-stage absorption tower and respectively enter into the 2# acid cooler and the 3# acid cooler for reuse;
and meanwhile, the absorbed flue gas flows into the first air inlet pipe again through the return pipe, is mixed with new smelting flue gas through the sulfuric acid fan, and is subjected to the processes of purification, drying, conversion, absorption and the like again, so that the cyclic treatment is realized, and finally, the high-quality sulfuric acid product is obtained.
In step 4), the spray circulating liquid in the 1# circulating tank and the 2# circulating tank can be flowed into the 3# acid cooler for enrichment through a pipeline connected with the third liquid outlet pipe through the 1# circulating tank and a pipeline connected with the fifth liquid outlet pipe through the 2# circulating tank.
Further, in the step 4), the acid liquor obtained after absorption is discharged from the drying tower, the primary absorption tower and the secondary absorption tower respectively, and enters the No. 1 acid cooler, the No. 2 acid cooler and the No. 3 acid cooler respectively through circulation, and then is enriched through a pipeline, and finally flows into the finished acid cooler through the first bypass pipe, the second bypass pipe and the third bypass pipe and is discharged to an underground tank of a subsequent process.
In step 4), the acid liquor in the 1# circulation tank, the 2# circulation tank and the 3# circulation tank can be discharged to the underground tank in the subsequent process through the discharge pipe, and finally, the high-quality sulfuric acid product is obtained.
Compared with the prior art, the utility model has the beneficial effects that:
1. the treatment process of the device comprises a cyclic purification-drying-conversion-absorption process, and is mainly characterized in that compounds such as sulfur dioxide in the flue gas are absorbed in a two-stage absorption mode, the absorbed flue gas enters a sulfuric acid fan, the absorbed flue gas and gas generated by sulfuric acid oxidation are mixed together, and the generated gas is subjected to purification, drying, conversion, absorption and other processes to finally obtain a high-quality sulfuric acid product, so that emission reduction of harmful gases and compounds such as sulfur dioxide in smelting flue gas is realized, and the purposes of economy, high efficiency and environmental protection are achieved.
2. The device does not need to additionally carry out desulfurization treatment in the treatment process, thereby reducing energy consumption and process flow and lowering production cost.
3. The device provided by the utility model has the advantages of simple structure and convenience in operation, and can be suitable for emission reduction treatment of various smelting smoke.
Drawings
FIG. 1 is a schematic diagram of an emission reduction device for acid making tail gas of smelting flue gas in example 1;
wherein: 1. sulfuric acid blower, 2, purifying tower, 3, drying tower, 4, converting tower, 5, primary absorption tower, 6, secondary absorption tower, 7, 1# acid cooler (wherein contains 93% sulfuric acid as drier), 8, 2# acid cooler (wherein contains 98% sulfuric acid as absorbent), 9, 3# acid cooler (wherein contains 98% sulfuric acid as absorbent), 10, 1# circulation tank, 11, 2# circulation tank, 12, 3# circulation tank, 13, finished acid cooler, 14, first drain pipe, 15, second drain pipe, 16, third drain pipe, 17, fourth drain pipe, 18, fifth drain pipe, 19, sixth drain pipe, 20, discharge pipe, 21, first bypass pipe, 22, return pipe, 23, first intake pipe.
Detailed Description
For an understanding of the present utility model, reference will now be made in detail to the present utility model, examples of which are illustrated in the accompanying drawings and described in the preferred embodiments, but the scope of the utility model is not limited to the specific embodiments.
Unless defined otherwise, all technical and scientific terms used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the scope of the present utility model.
Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present utility model are commercially available or may be prepared by existing methods.
Example 1
As shown in figure 1, the emission reduction device for the tail gas of the acid production of smelting flue gas comprises a purifying tower 2, a drying tower 3, a converting tower 4, a plurality of absorbing towers, a plurality of acid coolers (i.e. sulfuric acid coolers) and a plurality of circulating tanks;
specifically, the purifying tower 2 of the embodiment is provided with one purifying tower, and the specification is 2000 mm/8000 mm H=13 m in phi;
the drying tower 3 is provided with one drying tower, and the specification is phi 800mmx 16235mm;
the two absorption towers are respectively a primary absorption tower 5 (specification phi 7500mm in the specification 19000 mm) and a secondary absorption tower 6 (specification phi 7500mm in the specification 16100 mm);
the acid coolers are provided with four acid coolers, namely a No. 1 acid cooler 7 (containing sulfuric acid with the concentration of 93 percent as a drying agent), a No. 2 acid cooler 8 (containing sulfuric acid with the concentration of 98 percent as an absorbent), a No. 3 acid cooler 9 (containing sulfuric acid with the concentration of 98 percent as an absorbent) and a finished acid cooler 13;
the circulation tanks are provided with three circulation tanks, namely a 1# circulation tank 10, a 2# circulation tank 11 and a 3# circulation tank 12;
specifically, the purifying tower 2, the drying tower 3, the converting tower 4, the primary absorption tower 5 and the secondary absorption tower 6 are all arranged vertically; the acid cooler 7 # 1, the acid cooler 8 # 2, the acid cooler 9 # 3, the circulating tank 10 # 1, the circulating tank 11 # 2, the circulating tank 12 # 3 and the finished acid cooler 13 are all horizontally arranged.
The smelting flue gas is introduced into the air inlet end of the side wall of the purification tower 2 through a first air inlet pipe 23, the first air inlet pipe 23 is provided with a sulfuric acid fan 1, and the air outlet end at the top of the purification tower 2 is communicated with the air inlet end of the side wall of the drying tower 3 through a pipeline;
the air outlet end at the top of the drying tower 3 is communicated with the bottom of the conversion tower 4 through a pipeline, and the top of the conversion tower 4 is communicated with the air inlet end of the side wall of the primary absorption tower 5 through a pipeline;
the air outlet end at the top of the primary absorption tower 5 is communicated with the air inlet end of the side wall of the secondary absorption tower 6 through a pipeline, and the air outlet end at the top of the secondary absorption tower 6 is communicated with the first air inlet pipe 23 through a return pipe 22.
The purifying tower 2 is internally provided with a purifying spray pipe and a packing layer from top to bottom in sequence, the liquid inlet end of the purifying spray pipe extends out of the purifying tower 2 and is communicated with a purifying liquid storage device arranged outside the purifying tower 2 through a pipeline, and the purifying liquid is dilute sulfuric acid with the concentration of 10%; the annular filler and the uniform filler are arranged in the filler layer, smelting flue gas enters the purifying tower 2 and contacts with spray liquid falling into the filler layer, the annular filler and the uniform filler can enhance the gas-liquid contact degree and the gas-liquid contact area, wherein the annular filler is circular, the uniform filler is corrugated regular filler, and the annular filler and the uniform filler are made of one of Polyethylene (PE), polypropylene (PP), reinforced polypropylene (RPP) and polyvinyl chloride (PVC); the annular filler and the uniform filler are conventional in the prior art, and the structure, the specification and the like of the annular filler and the uniform filler are not the utility model points of the utility model, so that the description is omitted; specifically, the purifying spray pipe is positioned below the air outlet end of the purifying tower 2, and the packing layer is positioned above the air inlet end of the purifying tower 2;
the flue gas entering the purifying tower 2 sequentially passes through the adsorption of the filler in the filler layer and the spraying of the purifying spraying pipe, so that pollutants such as particulate matters, sulfuric acid mist and the like in the flue gas are removed.
Preferably, the sulfuric acid fan 1 is arranged on a pipeline behind the joint of the return pipe 22 and the first air inlet pipe 23 and in front of the air inlet end of the purifying tower 2, so that new smelting flue gas and absorbed tail gas can be mixed and then enter the purifying tower 2 for circulating treatment, and the treatment efficiency is improved.
The liquid outlet end at the bottom of the drying tower 3 is communicated with the liquid inlet end of the 1# circulating tank 10 through a pipeline, a first liquid outlet end is arranged on the upper side wall of the 1# circulating tank 10, and a second liquid outlet end is arranged on the lower side wall of the 1# circulating tank 10;
the first liquid outlet end of the upper side wall of the No. 1 circulating tank 10 is communicated with the liquid inlet end of the side wall of the No. 1 acid cooler 7 through a first liquid outlet pipe 14, and a first output pump is arranged at the first liquid outlet end of the No. 1 circulating tank 10; a first spray pipe is arranged in the drying tower 3, the liquid inlet end of the first spray pipe extends out of the drying tower 3, the liquid outlet end of the No. 1 acid cooler 7 is communicated with the liquid inlet end of the first spray pipe through a second liquid outlet pipe 15, and a first lifting pump and a first valve are arranged at the outlet of the second liquid outlet pipe 15;
the conversion tower 4 is provided with a plurality of catalyst layers, and the catalyst is a vanadium-titanium catalyst, so that the oxidation efficiency can be improved.
The liquid outlet end at the bottom of the primary absorption tower 5 is communicated with the liquid inlet end of a No. 2 circulating tank 11 through a pipeline, a third liquid outlet end is arranged on the upper side wall of the No. 2 circulating tank 11, and a fourth liquid outlet end is arranged on the lower side wall of the No. 2 circulating tank 11;
the third liquid outlet end of the upper side wall of the No. 2 circulating tank 11 is communicated with the liquid inlet end of the side wall of the No. 2 acid cooler 8 through a third liquid outlet pipe 16, and a second output pump is arranged at the third liquid outlet end of the No. 2 circulating tank 11; the first-stage absorption tower 5 is internally provided with a second spray pipe, the liquid inlet end of the second spray pipe extends out of the first-stage absorption tower 5, the liquid outlet end of the No. 2 acid cooler 8 is communicated with the liquid inlet end of the second spray pipe through a fourth liquid outlet pipe 17, and the outlet of the fourth liquid outlet pipe 17 is provided with a second lifting pump and a second valve.
The liquid outlet end at the bottom of the secondary absorption tower 6 is communicated with the liquid inlet end of the 3# circulating tank 12 through a pipeline, a fifth liquid outlet end is arranged on the upper side wall of the 3# circulating tank 12, and a sixth liquid outlet end is arranged on the lower side wall of the 3# circulating tank 12;
the fifth liquid outlet end of the upper side wall of the 3# circulating groove 12 is communicated with the liquid inlet end of the side wall of the 3# acid cooler 9 through a fifth liquid outlet pipe 18, and a third output pump is arranged at the fifth liquid outlet end of the 3# circulating groove 12; a third spray pipe is arranged in the second-stage absorption tower 6, the liquid inlet end of the third spray pipe extends out of the second-stage absorption tower 6, the liquid outlet end of the 3# acid cooler 9 is communicated with the liquid inlet end of the third spray pipe through a sixth liquid outlet pipe 19, and a third lifting pump and a third valve are arranged at the outlet of the sixth liquid outlet pipe 19.
The first-stage absorption tower 5 and the second-stage absorption tower 6 are respectively provided with an acid liquor storage mechanism, the acid liquor storage mechanisms are positioned above the second spray pipes and the third spray pipes, and the acid liquor storage mechanisms can downwards spray acid liquor to absorb sulfur trioxide and other compounds in the flue gas by using the acid liquor to generate sulfuric acid.
The first output pump, the second output pump and the third output pump are concentrated acid pumps, and are used for lifting concentrated sulfuric acid in the 1# circulation tank 10, the 2# circulation tank 11 and the 3# circulation tank 12 to be used as spray liquid.
The spray liquid in the first spray pipe of the drying tower 3 is concentrated sulfuric acid with the concentration of 93 percent flowing out from the No. 1 acid cooler 7 to the first spray pipe; the spray liquid in the second spray pipe of the first-stage absorption tower 5 flows out of the 2# circulation tank 11 and flows back to the concentrated sulfuric acid with the concentration of 98% in the second spray pipe through the 2# acid cooler 8; the spray liquid in the third spray pipe of the secondary absorption tower 6 flows out of the 3# circulation tank 12 and flows back to the concentrated sulfuric acid with the concentration of 98% in the third spray pipe through the 3# acid cooler 9.
The drying tower 3, the primary absorption tower 5 and the secondary absorption tower 6 are matched with the 1# acid cooler 7, the 2# acid cooler 8, the 3# acid cooler 9, the 1# circulation tank 10, the 2# circulation tank 11 and the 3# circulation tank 12 in the operation process to realize functions, and specifically comprise the following steps:
when the drying tower 3 operates, a first lifting pump and a first valve at the outlet of the second liquid outlet pipe 15 are opened, concentrated sulfuric acid with the concentration of 93% is taken as a drying agent to enter a first spraying pipe of the drying tower 3 from the No. 1 acid cooler 7 for spraying, then flows into the No. 1 circulating tank 10 from the drying tower 3, and finally is circulated to the No. 1 acid cooler 7 for reuse by utilizing the first output pump.
When the first-stage absorption tower 5 operates, a second lifting pump and a second valve at the outlet of the fourth liquid outlet pipe 17 are opened, concentrated sulfuric acid with the concentration of 98% is taken as an absorbent to enter a second spraying pipe of the first-stage absorption tower 5 from the No. 2 acid cooler 8 for spraying, then flows into the No. 2 circulating tank 11 from the first-stage absorption tower 5, and finally is circulated to the No. 2 acid cooler 8 for reuse by utilizing a second output pump.
When the secondary absorption tower 6 operates, a third lifting pump and a third valve at the outlet of the sixth liquid outlet pipe 19 are opened, concentrated sulfuric acid with the concentration of 98% is taken as an absorbent to enter a third spray pipe of the secondary absorption tower 6 from the 3# acid cooler 9 for spraying, then flows into the 3# circulation tank 12 from the secondary absorption tower 6, and finally is circulated to the 3# acid cooler 9 for reuse by utilizing a third output pump.
Further, the upper side wall of the 1# circulating tank 10 is also provided with a seventh liquid outlet end, and the seventh liquid outlet end is communicated with the third liquid outlet pipe 16 through a pipeline; the upper side wall of the No. 2 circulating groove 11 is also provided with an eighth liquid outlet end which is communicated with a fifth liquid outlet pipe 18 through a pipeline.
Further, the second liquid outlet end is communicated to the underground tank in the subsequent process through the discharge pipe 20, and the fourth liquid outlet end and the sixth liquid outlet end are both communicated with the discharge pipe 20 through pipelines.
The second liquid outlet pipe 15 is provided with a first bypass pipe 21, the first bypass pipe 21 is communicated with the liquid inlet end of the finished acid cooler 13, and the liquid outlet end of the finished acid cooler 13 is communicated with the discharge pipe 20 through a pipeline; the fourth liquid outlet pipe 17 is provided with a second bypass pipe, the sixth liquid outlet pipe 19 is provided with a third bypass pipe, and the second bypass pipe and the third bypass pipe are communicated with the first bypass pipe 21.
Furthermore, the utility model also provides a smelting flue gas treatment process by using the device in the embodiment 1, which mainly comprises the steps of purifying by using a purifying tower 2, drying by using a drying tower 3, oxidizing sulfur dioxide gas in the flue gas into sulfur trioxide gas by using a converting tower 4, and absorbing sulfur trioxide and other compounds to obtain sulfuric acid products; the method comprises the following specific steps:
1) Smelting flue gas with the temperature of 70 ℃ and the content (volume fraction) of each component of the smelting flue gas being SO 2 19.52 %；CO 2 8.3%；N 2 41.12%；O 2 5.68 %；H 2 O 24.99 %；SO 3 0.4%) enters the purifying tower 2 through the first air inlet pipe 23 under the action of the sulfuric acid fan 1, and then is sequentially adsorbed by the filler in the filler layer and sprayed by the purifying spray pipe, so that 99% of pollutants such as particulate matters, 99% of sulfuric acid mist and the like in the flue gas can be removed;
2) The purified flue gas enters the drying tower 3, at the moment, a first lifting pump and a first valve at the outlet of a second liquid outlet pipe 15 are opened, concentrated sulfuric acid with the concentration of 93% is taken as a drying agent to enter a first spray pipe of the drying tower 3 from a No. 1 acid cooler 7 for spraying, the flue gas is dried and adsorbed, 99% of water in the flue gas is removed, meanwhile, spray liquid flows into a No. 1 circulating groove 10 from the bottom of the drying tower 3, and the spray liquid can be circulated to the No. 1 acid cooler 7 for reuse by using a first output pump;
3) The dried flue gas enters a conversion tower 4, and sulfur dioxide gas in the flue gas is oxidized into sulfur trioxide gas by using a catalyst in the conversion tower 4;
4) The converted flue gas sequentially enters a first-stage absorption tower 5 and a second-stage absorption tower 6, acid liquor is sprayed downwards by an acid liquor storage mechanism in the first-stage absorption tower 5 and the second-stage absorption tower 6, sulfur trioxide and other compounds in the flue gas are absorbed by using the acid liquor to generate sulfuric acid, the sulfuric acid is respectively entered into a 2# circulation tank 11 and a 3# circulation tank 12, respectively enter into a 2# acid cooler 8 and a 3# acid cooler 9, at the moment, a second lifting pump and a second valve at the outlet of a fourth liquid outlet pipe 17 and a third lifting pump and a third valve at the outlet of a sixth liquid outlet pipe 19 can be respectively opened, concentrated sulfuric acid with the concentration of 98% is respectively entered into the first-stage absorption tower 5 and the second-stage absorption tower 6 as an absorbent, the flue gas is re-absorbed, and then respectively flows into the 2# circulation tank 11 and the 3# circulation tank 12 from the first-stage absorption tower 5 and the second-stage absorption tower 6, and respectively enters into the 2# acid cooler 8 and the 3# acid cooler 9 for re-use;
during the process, the spray circulating liquid in the 1# circulating tank 10 and the 2# circulating tank 11 can also flow into the 3# acid cooler 9 for enrichment through a pipeline connected with the third liquid outlet pipe 16 through the 1# circulating tank 10 and a pipeline connected with the fifth liquid outlet pipe 18 through the 2# circulating tank 11;
the acid liquor obtained after absorption is discharged from the drying tower 3, the primary absorption tower 5 and the secondary absorption tower 6 respectively, enters the acid cooler 1# 7, the acid cooler 2# 8 and the acid cooler 3# 9 respectively through circulation, is enriched through pipelines, flows into the finished acid cooler 13 through the first bypass pipe 21, the second bypass pipe and the third bypass pipe and is discharged to an underground tank of the subsequent process;
in addition, the acid liquor in the 1# circulation tank 10, the 2# circulation tank 11 and the 3# circulation tank 12 can be discharged to the underground tank in the subsequent process through the discharge pipe 20, and finally, a high-quality sulfuric acid product is obtained;
and meanwhile, the absorbed flue gas flows into the first air inlet pipe 23 again through the return pipe 22, is mixed with new smelting flue gas through the sulfuric acid fan 1, and is subjected to the processes of purification, drying, conversion, absorption and the like again, so that the circulating treatment is realized.
The device and the process can realize the mixing of new smelting flue gas and absorbed tail gas, and realize the cyclic treatment after the processes of purification, drying, conversion, absorption and the like, and finally obtain a high-quality sulfuric acid product;
the purity of the obtained sulfuric acid product is 98 percent, and the recovery efficiency of sulfur dioxide reaches 99.85 percent after the device and the process are processed.
The device can mix new smelting flue gas again in the absorbed flue gas, and perform purification, drying, conversion, absorption and other processes again, so that the cyclic treatment is realized, and the treatment efficiency is improved.
The device does not need to additionally carry out desulfurization treatment in the treatment process, thereby reducing energy consumption and process flow and lowering production cost.
The device provided by the utility model has the advantages of simple structure and convenience in operation, and can be suitable for emission reduction treatment of various smelting smoke.
In the description of the present utility model, it should be noted that, for the azimuth words such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the azimuth and positional relationships are based on the azimuth or positional relationships shown in the drawings, it is merely for convenience of describing the present utility model and simplifying the description, and it is not to be construed as limiting the specific protection scope of the present utility model by indicating or implying that the apparatus or element to be referred to must have a specific azimuth configuration and operation.
It should be noted that the terms "first," "second," and the like in the description and in the claims of the present application are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the present application described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, what should be said is: the foregoing description is only of the preferred embodiments of the utility model and the application of the principles of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, while the present utility model has been described in connection with the above embodiments, it is to be understood that the utility model is not limited to the specific embodiments disclosed and that many other and equally effective embodiments may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (10)
1. The emission reduction device for the acid production tail gas of the smelting flue gas is characterized by comprising a purifying tower, a drying tower, a converting tower, a plurality of absorbing towers, a plurality of acid coolers and a plurality of circulating tanks;
the two absorption towers are respectively a primary absorption tower and a secondary absorption tower; the acid coolers are four, namely a 1# acid cooler, a 2# acid cooler, a 3# acid cooler and a finished product acid cooler; the circulation tanks are three, namely a 1# circulation tank, a 2# circulation tank and a 3# circulation tank;
the smelting flue gas is introduced into the air inlet end of the side wall of the purifying tower through a first air inlet pipe, and the air outlet end at the top of the purifying tower is communicated with the air inlet end of the side wall of the drying tower through a pipeline; the air outlet end at the top of the drying tower is communicated with the bottom of the conversion tower through a pipeline, and the top of the conversion tower is communicated with the air inlet end of the side wall of the primary absorption tower through a pipeline; the air outlet end at the top of the primary absorption tower is communicated with the air inlet end of the side wall of the secondary absorption tower through a pipeline, and the air outlet end at the top of the secondary absorption tower is communicated with the first air inlet pipe through a return pipe;
the liquid outlet end at the bottom of the drying tower is communicated with the liquid inlet end of the 1# circulating groove through a pipeline, the upper side wall of the 1# circulating groove is provided with a first liquid outlet end, and the lower side wall of the 1# circulating groove is provided with a second liquid outlet end;
the first liquid outlet end of the upper side wall of the No. 1 circulating groove is communicated with the liquid inlet end of the side wall of the No. 1 acid cooler through a first liquid outlet pipe; the liquid outlet end of the No. 1 acid cooler is communicated with a drying tower;
the liquid outlet end at the bottom of the primary absorption tower is communicated with the liquid inlet end of a 2# circulating tank through a pipeline, a third liquid outlet end is arranged on the upper side wall of the 2# circulating tank, and a fourth liquid outlet end is arranged on the lower side wall of the 2# circulating tank;
the third liquid outlet end of the upper side wall of the No. 2 circulating groove is communicated with the liquid inlet end of the side wall of the No. 2 acid cooler through a third liquid outlet pipe; the liquid outlet end of the No. 2 acid cooler is communicated with the primary absorption tower;
the liquid outlet end at the bottom of the secondary absorption tower is communicated with the liquid inlet end of the 3# circulating tank through a pipeline, a fifth liquid outlet end is arranged on the upper side wall of the 3# circulating tank, and a sixth liquid outlet end is arranged on the lower side wall of the 3# circulating tank;
the fifth liquid outlet end of the upper side wall of the 3# circulating groove is communicated with the liquid inlet end of the side wall of the 3# acid cooler through a fifth liquid outlet pipe; the liquid outlet end of the No. 3 acid cooler is communicated with the secondary absorption tower;
the second liquid outlet end is connected with a discharge pipe, and the fourth liquid outlet end and the sixth liquid outlet end are communicated with the discharge pipe through pipelines.
2. The device for reducing emission of acid making tail gas by using smelting flue gas according to claim 1, wherein a sulfuric acid fan is arranged on the first air inlet pipe.
3. The device for reducing emission of acid making tail gas by smelting flue gas according to claim 1, wherein a purification spray pipe is arranged in the purification tower, and a liquid inlet end of the purification spray pipe extends out of the purification tower and is communicated with a purification liquid storage device arranged outside the purification tower through a pipeline.
4. The smelting flue gas acid making tail gas emission reduction device according to claim 1, wherein a first output pump is arranged at a first liquid outlet end of the No. 1 circulating tank; the drying tower is internally provided with a first spray pipe, the liquid inlet end of the first spray pipe extends out of the drying tower, the liquid outlet end of the No. 1 acid cooler is communicated with the liquid inlet end of the first spray pipe through a second liquid outlet pipe, and a first lifting pump and a first valve are arranged at the outlet of the second liquid outlet pipe.
5. The smelting flue gas acid making tail gas emission reduction device according to claim 1, wherein a second output pump is arranged at a third liquid outlet end of the No. 2 circulating tank; the second spray pipe is arranged in the first-stage absorption tower, the liquid inlet end of the second spray pipe extends out of the first-stage absorption tower, the liquid outlet end of the No. 2 acid cooler is communicated with the liquid inlet end of the second spray pipe through a fourth liquid outlet pipe, and a second lifting pump and a second valve are arranged at the outlet of the fourth liquid outlet pipe.
6. The emission reduction device for the tail gas generated by acid production from smelting flue gas according to claim 1, wherein a third output pump is arranged at a fifth liquid outlet end of the 3# circulating tank; a third spray pipe is arranged in the second-stage absorption tower, the liquid inlet end of the third spray pipe extends out of the second-stage absorption tower, the liquid outlet end of the 3# acid cooler is communicated with the liquid inlet end of the third spray pipe through a sixth liquid outlet pipe, and a third lifting pump and a third valve are arranged at the outlet of the sixth liquid outlet pipe.
7. The device for reducing emission of tail gas generated by producing acid from smelting flue gas according to claim 1, wherein a plurality of catalyst layers are arranged in the conversion tower.
8. The device for reducing emission of tail gas generated by producing acid from smelting flue gas according to claim 1, wherein the first-stage absorption tower and the second-stage absorption tower are respectively provided with an acid liquid storage mechanism, and the acid liquid storage mechanisms are positioned above the second spray pipe and the third spray pipe.
9. The emission reduction device for the tail gas generated by producing acid from smelting flue gas according to claim 1, wherein the upper side wall of the No. 1 circulating groove is also provided with a seventh liquid outlet end which is communicated with a third liquid outlet pipe through a pipeline; the upper side wall of the No. 2 circulating groove is also provided with an eighth liquid outlet end which is communicated with a fifth liquid outlet pipe through a pipeline.
10. The device for reducing emission of tail gas generated by acid production from smelting flue gas according to claim 1, wherein the second liquid outlet pipe is provided with a first bypass pipe, the first bypass pipe is communicated with the liquid inlet end of the finished sulfuric acid cooler, and the liquid outlet end of the finished sulfuric acid cooler is communicated with the discharge pipe through a pipeline; the fourth liquid outlet pipe is provided with a second bypass pipe, the sixth liquid outlet pipe is provided with a third bypass pipe, and the second bypass pipe and the third bypass pipe are communicated with the first bypass pipe.
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|---|---|---|---|
| CN202322339248.8U CN220696362U (en) | 2023-08-30 | 2023-08-30 | Emission reduction device for smelting flue gas acid making tail gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202322339248.8U CN220696362U (en) | 2023-08-30 | 2023-08-30 | Emission reduction device for smelting flue gas acid making tail gas |
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