CN117815858A - Processing system and processing method for cooperatively processing kiln tail flue gas of rotary kiln for crystal transformation roasting - Google Patents
Processing system and processing method for cooperatively processing kiln tail flue gas of rotary kiln for crystal transformation roasting Download PDFInfo
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- CN117815858A CN117815858A CN202410202712.5A CN202410202712A CN117815858A CN 117815858 A CN117815858 A CN 117815858A CN 202410202712 A CN202410202712 A CN 202410202712A CN 117815858 A CN117815858 A CN 117815858A
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 149
- 239000003546 flue gas Substances 0.000 title claims abstract description 149
- 239000013078 crystal Substances 0.000 title claims abstract description 26
- 230000009466 transformation Effects 0.000 title claims abstract description 25
- 238000003672 processing method Methods 0.000 title abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract description 55
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 50
- 230000023556 desulfurization Effects 0.000 claims abstract description 50
- 238000002347 injection Methods 0.000 claims abstract description 48
- 239000007924 injection Substances 0.000 claims abstract description 48
- 238000004332 deodorization Methods 0.000 claims abstract description 39
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 22
- 239000000779 smoke Substances 0.000 claims abstract description 22
- 239000007789 gas Substances 0.000 claims abstract description 21
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 20
- 238000005496 tempering Methods 0.000 claims abstract description 16
- 239000000470 constituent Substances 0.000 claims abstract description 7
- 230000001590 oxidative effect Effects 0.000 claims abstract description 4
- 210000002381 plasma Anatomy 0.000 claims description 58
- 238000000034 method Methods 0.000 claims description 39
- 230000008569 process Effects 0.000 claims description 31
- 239000006227 byproduct Substances 0.000 claims description 13
- 239000000428 dust Substances 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 8
- 239000003054 catalyst Substances 0.000 claims description 6
- 238000007254 oxidation reaction Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 5
- 239000010962 carbon steel Substances 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 5
- 238000005536 corrosion prevention Methods 0.000 claims description 5
- 239000011152 fibreglass Substances 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- 230000018044 dehydration Effects 0.000 claims description 3
- 238000006297 dehydration reaction Methods 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 238000009827 uniform distribution Methods 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 1
- 238000004140 cleaning Methods 0.000 claims 1
- 238000004891 communication Methods 0.000 claims 1
- 229910052760 oxygen Inorganic materials 0.000 claims 1
- 239000001301 oxygen Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 8
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 12
- 230000001877 deodorizing effect Effects 0.000 description 10
- 238000010791 quenching Methods 0.000 description 9
- 230000000171 quenching effect Effects 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- -1 ion free radical Chemical class 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 238000006276 transfer reaction Methods 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000004887 air purification Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/32—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a processing system and a processing method for cooperatively processing kiln tail smoke of a rotary kiln for crystal transformation roasting, and relates to the technical field of tail gas processing, wherein the system comprises a smoke mixing reactor, a desulfurization, denitrification and deodorization cooperative tower and O 3 The device comprises a supply system and an injection type low-temperature plasma system, wherein the air inlet end of the flue gas mixing reactor is communicated with a kiln tail flue gas pipeline, the air outlet end of the flue gas mixing reactor is communicated with the air inlet end of the desulfurization, denitrification and deodorization cooperative tower, and the O3 supply system and the injection type low-temperature plasma system are both communicated with the inside of the flue gas mixing reactor. The invention removes organic matters in the flue gas by using injection type low-temperature plasma equipment and simultaneously uses O 3 Is characterized by strong oxidizing property, and synchronously fully oxidizes NO which is a main constituent molecule of NOx in flue gasAnd NOx tempering is realized. The desulfurization, denitrification and deodorization cooperative tower utilizes the characteristic that high-valence NOx is easy to dissolve in water, and the desulfurizing agent is used for completing the function of removing NOx in the flue gas.
Description
Technical Field
The invention relates to the technical field of tail gas treatment, in particular to the technical field of a treatment system and a treatment method for cooperatively treating kiln tail gas of a rotary kiln for crystal transformation roasting.
Background
At present, in the smelting process of lithium concentrate, a rotary kiln process of crystal transformation roasting is adopted to perform transformation roasting on the lithium concentrate, the alpha crystal form is converted into the beta crystal form, and then sulfuric acid process acidification roasting is performed to prepare a lithium salt primary product. The rotary kiln process for rotary kiln crystal transformation roasting is carried out by enterprises at home and abroad, and is carried out by feeding the kiln tail and discharging the kiln head. Kiln tail flue gas treatment is a key point and a difficult point of the whole production process.
The kiln tail flue gas of the general enterprise rotary kiln is mainly characterized in that: the smoke flow is about 3.5 ten thousand Nm 3 And/h, the smoke temperature is about 220 ℃ (up to about 260 ℃), and the smoke contains particulate matters and SO 2 NOx, and small amounts of organic matter (requiring deodorization), and the like. At present, according to the national environmental protection requirements of the industry, the general requirement is that the particulate matters are less than or equal to 10mg/Nm after the exhaust gas outside the kiln tail is effectively treated 3 ，SO 2 ≤35mg/Nm 3 ，NOx≤50mg/Nm 3 Individual enterprises have come to place demands for flue gas outlet deodorization.
At present, two treatment processes are generally adopted for treating kiln tail flue gas:
1) Wet process: kiln tail flue gas, dust removal, wet desulfurization, temperature rise, SCR denitration at medium and low temperature and emission;
2) And (3) dry process: kiln tail flue gas, dust removal, dry desulfurization, denitration and emission;
in the existing treatment process, a wet process is adopted as the main stream, but volatile organic matters are formed in the kiln tail raw material drying process due to the fact that organic matters brought by mineral separation agents are contained in the flue gas, and the accident cases of multiple desulfurizing tower demisters and wet electricity fire disaster occur already.
How to solve the problem of potential safety hazard caused by the easy formation of volatile organic compounds in the mainstream wet process is the effort of the technicians in the field.
Disclosure of Invention
The invention aims at: in order to solve the technical problems, the invention provides a processing system and a processing method for cooperatively processing kiln tail smoke of a rotary kiln for crystal transformation roasting.
The invention adopts the following technical scheme for realizing the purposes:
one aspect of the invention provides a kiln tail of a co-processing rotary kiln for crystal transformation roastingThe flue gas treatment system comprises a flue gas mixing reactor, a desulfurization and denitrification and deodorization cooperative tower and O 3 The device comprises a supply system and an injection type low-temperature plasma system for removing organic matters, wherein the air inlet end of the flue gas mixing reactor is communicated with a flue gas pipeline at the tail of a kiln, the air outlet end of the flue gas mixing reactor is communicated with the air inlet end of the desulfurization, denitrification and deodorization cooperative tower, the air outlet end of the desulfurization, denitrification and deodorization cooperative tower is provided with an exhaust pipe connected with the outside, and the O3 supply system and the injection type low-temperature plasma system are both communicated with the inside of the flue gas mixing reactor.
Specifically, the system is used for collaborative denitration, mainly uses injection type low-temperature plasma equipment to remove organic matters in smoke and uses O simultaneously 3 The high oxidization characteristic of the catalyst is that the main constituent molecule NO of NOx in the flue gas is fully oxidized synchronously, so that the quenching and tempering of the NOx is realized. The desulfurization, denitrification and deodorization cooperative tower utilizes the characteristic that high-valence NOx is easy to dissolve in water, and the desulfurization agent is used for completing the function of removing NOx in the flue gas in the wet desulfurization process.
The flue gas mixing reactor carries out quenching and tempering treatment on NOx in the flue gas to remove organic matters (deodorizing taste) in the flue gas;
the injection type low-temperature plasma system provides low-temperature plasma for the flue gas mixing reactor to realize the function of removing organic matters (deodorizing) in the flue gas;
O 3 the supply system provides the required O for the flue gas mixing reactor 3 ，O 3 NO contained in NOx in the flue gas is fully oxidized into high-valence nitrogen oxides in the flue gas mixing reactor, so that the water solubility of the NOx is changed, and the NOx is convenient to cooperatively remove in the subsequent wet desulfurization process. On the other hand, the organic matters in the flue gas are removed in an auxiliary way;
the flue gas treated by the flue gas mixing reactor in the desulfurization, denitration and deodorization cooperative tower is in cooperation with the low-temperature plasma system to remove the byproducts of organic matters (deodorizing) in the wet desulfurization process by adopting an alkaline desulfurizing agent, and the NOx in the flue gas is effectively removed after tempering.
In one embodiment, a dust remover and a cooling component are arranged on the kiln tail flue gas pipeline.
In one embodiment, the dust remover is a high-temperature cloth bag dust remover for removing particles in kiln tail flue gas.
In one embodiment, the cooling member is a GGH heat exchanger.
Specifically, the wet flue gas after desulfurization, denitrification and deodorization is used for carrying out heat exchange and cooling to about 130 ℃ on the flue gas with the original temperature of 220 ℃, and meanwhile, the discharged flue gas is heated to about 100 ℃ from about 65 ℃.
In one embodiment, the flue gas mixing reactor is a horizontal pipeline type mixing reactor, and the flue gas mixing reactor is made of carbon steel for corrosion prevention or glass fiber reinforced plastic.
Specifically, the flue gas mixing reactor is generally designed into a horizontal pipeline type, and is made of carbon steel for corrosion prevention or glass fiber reinforced plastic processing according to the flue gas temperature.
In one embodiment, the O 3 The supply system is configured with a pipe network, a valve and a metering control system to realize O 3 The NOx concentration in the tail flue gas of the feeding kiln is dynamically regulated and controlled along with the change of the NOx concentration, O 3 The supply system includes O 3 A generator.
Specifically O 3 Supply system according to O 3 The dosage is selected from O 3 The generator is used for selecting a flue gas mixing reactor O according to the original concentration of NOx in kiln tail flue gas and the target NOx removal value 3 The supply amount oxidizes the low valence N0x into high valence nitrogen oxides which are easy to be dissolved in water. Simultaneous configuration of system supplies O 3 Pipe network, valve and metering control system. Realizing the dynamic regulation and control of O3 supply along with the change of NOx concentration in flue gas
Accounting system O according to the least adverse condition (namely, NO content 95%) of NOx composition in flue gas 3 Supply amount.
The system considers certain O 3 Rich margin, ensure the realization of the set target, redundant O 3 And the waste water is removed in the subsequent wet desulfurization process (desulfurization, denitrification and deodorization cooperative towers).
In one embodiment, the injection type low temperature plasma system comprises a front air purification device, a rear plasma generator and an injection system, wherein the injection system is communicated with the interior of the flue gas mixing reactor.
Specifically, the injection type low temperature plasma equipment belongs to complete equipment, and consists of a front air purifying device, a rear plasma generator and an injection system. The low-temperature plasma generated by the clean air from the outside through the plasma generator is injected into the flue gas mixing reactor through a pipeline in time by a fan, and the plasma is uniformly mixed with the flue gas to remove organic matters in the flue gas.
The injection type plasma deodorizing technology adopts the principle of high energy ion free radical, hydroxyl and O 3 And bombarding organic molecules in the flue gas to ionize, dissociate and excite the organic molecules, converting macromolecular pollutants into micromolecular substances, and generating subsequent multiple physical and chemical reactions to achieve the aim of removing the decomposed organic pollutants.
In one embodiment, the injection system injects the low-temperature plasma with an amount which is one tenth of the amount of smoke, the injection system comprises an injection pipeline, and a uniform distribution device capable of uniformly regulating the amount of plasma entering is arranged at the tail end of the injection pipeline.
Specifically, in order to improve the optimal utilization efficiency of the plasma, the plasma is uniformly adjusted by a uniformly-distributed device arranged on an inlet pipeline when entering the mixer. The organic matters (deodorizing smell) in the kiln tail flue gas are removed, and the low-temperature plasma is mainly used for treating the flue gas by the action of injection type low-temperature plasma, wherein the low-temperature plasma quantity is counted by one tenth of the flue gas treatment quantity.
In one embodiment, the desulfurization, denitrification and deodorization cooperative tower comprises a tower body, a flue gas introduction channel arranged at the lower part of the tower body, a desulfurizing agent spraying system arranged at the middle part of the tower body, a defogging component arranged at the upper part of the tower body, a desulfurizing agent storage and preparation system, a desulfurizing agent circulation supply system, a byproduct oxidation system and byproduct dehydration, wherein the defogging component is a demister or a wet electric demister.
Specifically, the exhaust gas after deodorization and flue gas NOx quenching and tempering is introduced from the flue gas at the middle lower part of the desulfurization, denitrification and deodorization cooperative tower through a pipeline, and is downwards sprayed through a middle desulfurizing agentThe waste gas is subjected to reverse absorption reaction, and is further treated by an upper demister or a wet electric demister, so that the waste gas is discharged. The desulfurization, denitrification and deodorization cooperative tower has a multifunctional tower, and by adding an alkaline desulfurizing agent, atomized liquid drops are formed in the tower through a nozzle, and fully contact, transfer and chemical reaction are carried out on the flue gas by countercurrent flow, SO that SO in the flue gas is removed 2 The denitration purpose is realized, and the byproduct and the surplus O generated by the organic matters in the front-end mixing reactor are further washed away 3 。
And the flue gas after desulfurization, denitration and deodorization enters a wet electric defogging system to further remove particles in the flue gas after being treated by the cooperative tower.
And the wet flue gas is utilized to heat, so that white pollution of the wet treatment process is eliminated.
The invention also provides a method for cooperatively treating kiln tail smoke of a rotary kiln for crystal transformation roasting, which adopts the treatment system for cooperatively treating kiln tail smoke of the rotary kiln for crystal transformation roasting, and comprises the following steps:
s1, enabling kiln tail flue gas to enter a flue gas mixing reactor;
s2, injecting low-temperature plasmas into a flue gas mixing reactor according to the required quantity by the injection type low-temperature plasma system to decompose organic matters in the flue gas;
S3、O 3 the supply system injects O into the flue gas mixing reactor 3 By O 3 The strong oxidizing property of the catalyst is characterized in that the main constituent molecule NO of NOx in the flue gas is fully oxidized synchronously, so that the quenching and tempering of the NOx is realized;
s4, enabling the flue gas treated in the step 2 and the step 3 to enter a desulfurization, denitrification and deodorization cooperative tower, and cooperatively realizing the further removal of byproducts for removing organic matters in an injection type low-temperature plasma system and the effective removal of NOx in the flue gas after tempering in the wet desulfurization process by adopting an alkaline desulfurizing agent.
S5, discharging the smoke reaching the standard into the atmosphere.
The beneficial effects of the invention are as follows:
1. compared with the traditional wet process, the method omits links of the traditional process, such as the need of configuring a medium-low temperature SCR denitration system and an auxiliary system. Provides a synergistic treatment process for solving the problem of flue gas deodorization in the next step of enterprises. The potential safety hazard problem commonly existing in the existing system is completely eradicated. The method is in line with a green, low-carbon, energy-saving and environment-friendly comprehensive treatment process.
2. Mainly uses injection type low-temperature plasma equipment to remove organic matters in the flue gas and O at the same time 3 The high oxidization characteristic of the catalyst is that the main constituent molecule NO of NOx in the flue gas is fully oxidized synchronously, so that the quenching and tempering of the NOx is realized. The desulfurization, denitrification and deodorization cooperative tower utilizes the characteristic that high-valence NOx is easy to dissolve in water, and the desulfurization agent is used for completing the function of removing NOx in the flue gas in the wet desulfurization process.
Drawings
FIG. 1 is a schematic diagram of a system for cooperatively treating kiln tail flue gas of a rotary kiln for crystal transformation roasting.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In describing embodiments of the present invention, it should be noted that the directions or positional relationships indicated by the terms "inner", "outer", "upper", etc. are directions or positional relationships based on those shown in the drawings, or those that are conventionally put in place when the inventive product is used, are merely for convenience of description and simplification of description, and are not indicative or implying that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Example 1
As shown in FIG. 1, the embodiment provides a processing system for cooperatively processing kiln tail smoke of a rotary kiln for crystal transformation roasting, which comprises a smoke mixing reactor, a desulfurization and denitrification and deodorization cooperative tower and O 3 The device comprises a supply system and an injection type low-temperature plasma system for removing organic matters, wherein the air inlet end of the flue gas mixing reactor is communicated with a flue gas pipeline at the tail of a kiln, the air outlet end of the flue gas mixing reactor is communicated with the air inlet end of the desulfurization, denitrification and deodorization cooperative tower, the air outlet end of the desulfurization, denitrification and deodorization cooperative tower is provided with an exhaust pipe connected with the outside, and the O3 supply system and the injection type low-temperature plasma system are both communicated with the inside of the flue gas mixing reactor.
Specifically, the system is used for collaborative denitration, mainly uses injection type low-temperature plasma equipment to remove organic matters in smoke and uses O simultaneously 3 The high oxidization characteristic of the catalyst is that the main constituent molecule NO of NOx in the flue gas is fully oxidized synchronously, so that the quenching and tempering of the NOx is realized. The desulfurization, denitrification and deodorization cooperative tower utilizes the characteristic that high-valence NOx is easy to dissolve in water, and the desulfurization agent is used for completing the function of removing NOx in the flue gas in the wet desulfurization process.
The flue gas mixing reactor carries out quenching and tempering treatment on NOx in the flue gas to remove organic matters (deodorizing taste) in the flue gas;
the injection type low-temperature plasma system provides low-temperature plasma for the flue gas mixing reactor to realize the function of removing organic matters (deodorizing) in the flue gas;
O 3 supply ofThe system provides the required O for the flue gas mixing reactor 3 ，O 3 NO contained in NOx in the flue gas is fully oxidized into high-valence nitrogen oxides in the flue gas mixing reactor, so that the water solubility of the NOx is changed, and the NOx is convenient to cooperatively remove in the subsequent wet desulfurization process. On the other hand, the organic matters in the flue gas are removed in an auxiliary way;
the flue gas treated by the flue gas mixing reactor in the desulfurization, denitration and deodorization cooperative tower is in cooperation with the low-temperature plasma system to remove the byproducts of organic matters (deodorizing) in the wet desulfurization process by adopting an alkaline desulfurizing agent, and the NOx in the flue gas is effectively removed after tempering.
Example 2
This example was further optimized on the basis of example 1, and is specifically as follows:
and a dust remover and a cooling component are arranged on the kiln tail flue gas pipeline.
The dust remover is a high-temperature cloth bag dust remover for removing particles in kiln tail smoke.
The cooling component is a GGH heat exchanger.
Specifically, the wet flue gas after desulfurization, denitrification and deodorization is used for carrying out heat exchange and cooling to about 130 ℃ on the flue gas with the original temperature of 220 ℃, and meanwhile, the discharged flue gas is heated to about 100 ℃ from about 65 ℃.
Example 3
This example was further optimized on the basis of example 1 or example 2, and is specifically as follows:
the flue gas mixing reactor is a horizontal pipeline type mixing reactor, and the flue gas mixing reactor is made of carbon steel corrosion prevention or glass fiber reinforced plastic.
Specifically, the flue gas mixing reactor is generally designed into a horizontal pipeline type, and is made of carbon steel for corrosion prevention or glass fiber reinforced plastic processing according to the flue gas temperature.
Example 4
This example was further optimized on the basis of examples 1 to 3, and is specifically as follows:
the O is 3 Supply system configuration pipe network, valveDoor and metering control system for realizing O 3 The NOx concentration in the tail flue gas of the feeding kiln is dynamically regulated and controlled along with the change of the NOx concentration, O 3 The supply system includes O 3 A generator.
Specifically O 3 Supply system according to O 3 The dosage is selected from O 3 The generator is used for selecting a flue gas mixing reactor O according to the original concentration of NOx in kiln tail flue gas and the target NOx removal value 3 The supply amount oxidizes the low valence N0x into high valence nitrogen oxides which are easy to be dissolved in water. Simultaneous configuration of system supplies O 3 Pipe network, valve and metering control system. Realizing the dynamic regulation and control of O3 supply along with the change of NOx concentration in flue gas
Accounting system O according to the least adverse condition (namely, NO content 95%) of NOx composition in flue gas 3 Supply amount.
The system considers certain O 3 Rich margin, ensure the realization of the set target, redundant O 3 And the waste water is removed in the subsequent wet desulfurization process (desulfurization, denitrification and deodorization cooperative towers).
Example 5
This example was further optimized on the basis of examples 1 to 4, and is specifically as follows:
the injection type low-temperature plasma system comprises a front air purifying device, a rear plasma generator and an injection system, wherein the injection system is communicated with the inside of the flue gas mixing reactor.
Specifically, the injection type low temperature plasma equipment belongs to complete equipment, and consists of a front air purifying device, a rear plasma generator and an injection system. The low-temperature plasma generated by the clean air from the outside through the plasma generator is injected into the flue gas mixing reactor through a pipeline in time by a fan, and the plasma is uniformly mixed with the flue gas to remove organic matters in the flue gas.
The injection type plasma deodorizing technology adopts the principle of high energy ion free radical, hydroxyl and O 3 Bombarding organic molecules in the flue gas to ionize, dissociate and excite the organic molecules, converting macromolecular pollutants into micromolecular substances, and generating subsequent multiple physical and chemical reactions to remove the decomposed organic pollutantsA kind of electronic device.
Example 6
This example was further optimized based on example 5, and is specifically as follows:
the injection system is used for injecting low-temperature plasma in an amount which is one tenth of the amount of injected smoke, the injection system comprises an injection pipeline, and a uniform distribution device capable of uniformly regulating the entering amount of the plasma is arranged at the tail end of the injection pipeline.
Specifically, in order to improve the optimal utilization efficiency of the plasma, the plasma is uniformly adjusted by a uniformly-distributed device arranged on an inlet pipeline when entering the mixer. The organic matters (deodorizing smell) in the kiln tail flue gas are removed, and the low-temperature plasma is mainly used for treating the flue gas by the action of injection type low-temperature plasma, wherein the low-temperature plasma quantity is counted by one tenth of the flue gas treatment quantity.
Example 7
This example was further optimized on the basis of examples 1 to 6, and is specifically as follows:
the desulfurization, denitrification and deodorization cooperative tower comprises a tower body, a flue gas introducing channel arranged at the lower part of the tower body, a desulfurizing agent spraying system arranged at the middle part of the tower body, a demisting assembly arranged at the upper part of the tower body, a desulfurizing agent storage and preparation system, a desulfurizing agent circulation supply system, a byproduct oxidation system and byproduct dehydration, wherein the demisting assembly is a demister or a wet electric demister.
Specifically, the exhaust gas after deodorization and flue gas NOx quenching and tempering is introduced from the middle-lower flue gas of the desulfurization, denitrification and deodorization cooperative tower through a pipeline, is sprayed downwards through a middle desulfurizing agent to form a reverse absorption reaction, is further treated through an upper demister or a wet electric demister, and is discharged. The desulfurization, denitrification and deodorization cooperative tower has a multifunctional tower, and by adding an alkaline desulfurizing agent, atomized liquid drops are formed in the tower through a nozzle, and fully contact, transfer and chemical reaction are carried out on the flue gas by countercurrent flow, SO that SO in the flue gas is removed 2 The denitration purpose is realized, and the byproduct and the surplus O generated by the organic matters in the front-end mixing reactor are further washed away 3 。
And the flue gas after desulfurization, denitration and deodorization enters a wet electric defogging system to further remove particles in the flue gas after being treated by the cooperative tower.
And the wet flue gas is utilized to heat, so that white pollution of the wet treatment process is eliminated.
Example 8
The embodiment provides a method for cooperatively processing kiln tail smoke of a rotary kiln for crystal transformation roasting, which adopts the processing system for cooperatively processing kiln tail smoke of the rotary kiln for crystal transformation roasting, and comprises the following steps:
s1, enabling kiln tail flue gas to enter a flue gas mixing reactor;
s2, injecting low-temperature plasmas into a flue gas mixing reactor according to the required quantity by the injection type low-temperature plasma system to decompose organic matters in the flue gas;
S3、O 3 the supply system injects O into the flue gas mixing reactor 3 By O 3 The strong oxidizing property of the catalyst is characterized in that the main constituent molecule NO of NOx in the flue gas is fully oxidized synchronously, so that the quenching and tempering of the NOx is realized;
s4, enabling the flue gas treated in the step 2 and the step 3 to enter a desulfurization, denitrification and deodorization cooperative tower, and cooperatively realizing the further removal of byproducts for removing organic matters in an injection type low-temperature plasma system and the effective removal of NOx in the flue gas after tempering in the wet desulfurization process by adopting an alkaline desulfurizing agent.
S5, discharging the smoke reaching the standard into the atmosphere.
Specifically, compared with the traditional wet process, the scheme omits links of the traditional process, such as the need of configuring a medium-low temperature SCR denitration system and an auxiliary system. Provides a synergistic treatment process for solving the problem of flue gas deodorization in the next step of enterprises. The potential safety hazard problem commonly existing in the existing system is completely eradicated. The method is in line with a green, low-carbon, energy-saving and environment-friendly comprehensive treatment process.
Claims (10)
1. A processing system for cooperatively processing kiln tail smoke of a rotary kiln for crystal transformation roasting is characterized by comprising a smoke mixing reactor, a desulfurization and denitrification and deodorization cooperative tower and O 3 Supply system and method for removingThe injection type low-temperature plasma system for removing organic matters, the air inlet end of the flue gas mixing reactor is communicated with a kiln tail flue gas pipeline, the air outlet end of the flue gas mixing reactor is communicated with the air inlet end of the desulfurization, denitrification and deodorization cooperative tower, the air outlet end of the desulfurization, denitrification and deodorization cooperative tower is provided with an exhaust pipe connected with the outside, and the oxygen (O) 3 The supply system and the injection type low-temperature plasma system are communicated with the inside of the flue gas mixing reactor.
2. The processing system for cooperatively processing kiln tail gas of a rotary kiln for crystal transformation roasting according to claim 1, wherein a dust remover and a cooling component are arranged on a kiln tail gas pipeline.
3. The processing system for cooperatively processing kiln tail gas of a rotary kiln for crystal transformation roasting according to claim 2, wherein the dust remover is a high-temperature bag-type dust remover for removing particles in the kiln tail gas.
4. The processing system for cooperatively processing kiln tail gas of a rotary kiln for crystal transformation roasting according to claim 2, wherein the cooling component is a GGH heat exchanger.
5. The processing system for cooperatively processing kiln tail gas of a rotary kiln for crystal transformation roasting according to claim 2, wherein the gas mixing reactor is a horizontal pipeline type mixing reactor, and the gas mixing reactor is made of carbon steel for corrosion prevention or glass fiber reinforced plastic.
6. The processing system for cooperatively processing kiln tail gas of a rotary kiln for crystal transformation roasting according to claim 1, wherein the O 3 The supply system is configured with a pipe network, a valve and a metering control system to realize O 3 The NOx concentration in the tail flue gas of the feeding kiln is dynamically regulated and controlled along with the change of the NOx concentration, O 3 The supply system includes O 3 A generator.
7. The system for collaborative treatment of kiln tail flue gas of a rotary kiln according to claim 1, wherein the injection type low temperature plasma system includes a front air cleaning device, a rear plasma generator, and an injection system in communication with the flue gas mixing reactor.
8. The processing system for cooperatively processing kiln tail gas of a rotary kiln for crystal transformation roasting according to claim 1, wherein the injection system injects the low-temperature plasma in an amount which is one tenth of the amount of the gas, the injection system comprises an injection pipeline, and a uniform distribution device capable of uniformly regulating the amount of the plasma is arranged at the tail end of the injection pipeline.
9. The processing system for co-processing kiln tail gas of a rotary kiln for crystal transformation roasting according to claim 1, wherein the desulfurization, denitrification and deodorization co-processing tower comprises a tower body, a gas introduction channel arranged at the lower part of the tower body, a desulfurizing agent spraying system arranged at the middle part of the tower body, a demisting assembly arranged at the upper part of the tower body, a desulfurizing agent storage and preparation system, a desulfurizing agent circulation supply system, a byproduct oxidation system and byproduct dehydration, and the demisting assembly is a demister or a wet electric demister.
10. A method for cooperatively treating kiln tail gas of a rotary kiln for crystal transformation roasting, which adopts the treatment system for cooperatively treating kiln tail gas of the rotary kiln for crystal transformation roasting according to any one of claims 1 to 9, and is characterized by comprising the following steps:
s1, enabling kiln tail flue gas to enter a flue gas mixing reactor;
s2, injecting low-temperature plasmas into a flue gas mixing reactor according to the required quantity by the injection type low-temperature plasma system to decompose organic matters in the flue gas;
S3、O 3 the supply system injects O into the flue gas mixing reactor 3 By O 3 The strong oxidizing property of the catalyst can fully oxidize the NOx main constituent molecule NO in the flue gas synchronously,realizing NOx tempering;
s4, enabling the flue gas treated in the step 2 and the step 3 to enter a desulfurization, denitrification and deodorization cooperative tower, and cooperatively realizing the further removal of byproducts of removing organic matters in an injection type low-temperature plasma system and the effective removal of NOx in the flue gas after tempering in the wet desulfurization process by adopting an alkaline desulfurizing agent;
s5, discharging the smoke reaching the standard into the atmosphere.
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