CN112275108A - Sintering flue gas co-processing system, flue gas processing method and application - Google Patents
Sintering flue gas co-processing system, flue gas processing method and application Download PDFInfo
- Publication number
- CN112275108A CN112275108A CN202011235012.4A CN202011235012A CN112275108A CN 112275108 A CN112275108 A CN 112275108A CN 202011235012 A CN202011235012 A CN 202011235012A CN 112275108 A CN112275108 A CN 112275108A
- Authority
- CN
- China
- Prior art keywords
- flue gas
- solid waste
- sintering flue
- combustion
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
-
- 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
- B01D53/68—Halogens or halogen compounds
- B01D53/70—Organic halogen compounds
-
- 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
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Treating Waste Gases (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a sintering flue gas co-processing system and a sintering flue gas processing method. The invention can realize the cooperative disposal of various pollutants, the internal thermal reactor effectively controls the discharge amount of carbon monoxide, and simultaneously reduces the pollution of dioxin; the heat released by the combustion of the carbon monoxide and the dioxin further assists the treatment of other pollution components by the internal thermal reactor; the denitration mode of the system treatment provided by the invention simultaneously adopts direct reduction denitration and nitrogen reduction denitration, and has the advantages of good denitration stability, low cost and high efficiency; the by-product of the synergistic treatment system provided by the invention is stable components such as calcium sulfate and the like, unstable components such as calcium sulfite and the like are not generated, and the by-product can be used as a cement raw material, so that double environmental protection benefits of solid waste treatment are realized.
Description
Technical Field
The invention relates to the technical field of cleaning, in particular to a sintering flue gas cooperative processing system and a sintering flue gas processing method.
Background
With the continuous development of the heavy industry in China, the problem of environmental pollution is more and more serious, and in the heavy industry, the steel industry is the basic industry in China and is also one of the main industries increasing the environmental pollution. Its sintering flue gas SO2The discharge amount already accounts for the whole industrial SO2The emission is about 12 percent, which is SO in the steel industry2The air pollution treatment standard of an important pollution control object is continuously improved, the ultralow emission of the steel industry is gradually promoted, and the requirement of SO2The discharge concentration is not higher than 35mg/Nm3。
At present, sintering flue gas desulfurization technology can be divided into wet desulfurization, semi-dry desulfurization and dry desulfurization according to the physical state of an absorbent. The limestone-gypsum desulfurization system in wet desulfurization is the most mature flue gas desulfurization process at present, and the process takes limestone or lime slurry as a desulfurizing agent to remove SO in an absorption tower2Spraying and washing the flue gas to ensure that SO in the flue gas2Reaction to produce CaSO3And CaSO4Simultaneously blowing air into the slurry in the absorption tower to force the CaSO3Are all oxidized into CaSO4The by-product of the desulfurization is gypsum. And meanwhile, air is blown to generate more uniform slurry, so that the desulfurization rate is easy to reach 90%, and scaling and blockage are easy to control. The main advantages of the limestone/gypsum process are: the applicable coal variety range is wide, the desulfurization efficiency is high (when some devices Ca/S are equal to 1, the desulfurization efficiency is more than 90%), the utilization rate of the absorbent is high (can be more than 90%), the operation rate of the device is high (can reach more than 90%), the working reliability is high, and the source of the desulfurizer-limestone is rich and cheap. However, the disadvantages of the limestone/gypsum process are also evident: the initial investment cost is too high, the running cost is high, the occupied area is large, the system management operation is complex, the abrasion and corrosion phenomena are serious, the gypsum as a byproduct is difficult to treat, and the wastewater is difficult to treat.
The dry desulfurization is to remove SO in flue gas by using powdery or granular absorbent, adsorbent or catalyst2Gas, different dry processesThe desulfurizing agent works in different temperature zones, and can be divided into low-temperature (normal temperature and less than 100 ℃), medium-temperature (100 ℃ -400 ℃) and high-temperature (C: (B) (R))>400 ℃ desulfurizing agent, which has the defects that the utilization rate of the absorbent is lower than that of a wet desulphurization process, the removal effect of the absorbent for high-sulfur sintering flue gas is poorer, the comprehensive utilization of final products is influenced by the mixing of fly ash and desulphurization products, and the reaction in an absorption tower is incomplete to generate unstable products.
The mature semi-dry desulfurization process comprises an NID dry desulfurization technology, and the technical parameters are as follows: calcium-sulfur ratio (Ca/S):<1.4; material cycle times: 30-150 parts of; desulfurization efficiency: 70% -80%; desulfurized SO2Removing efficiency:>99 percent; dust removal efficiency:>99.9 percent; the availability of the system:>1 percent. The CFB circulating fluidized bed flue gas desulfurization technology comprises the following technical parameters: technical parameters calcium-sulfur ratio (Ca/S):<1.4; material cycle times: 30-100 parts; desulfurization efficiency:>80％；SO2removing efficiency:>99 percent; dust removal efficiency:>99.9 percent; the availability of the system:>98％。
the semi-dry desulphurization can generate a large amount of calcium sulfite, and the calcium sulfite is an unstable substance and easily causes secondary pollution to the environment. The product components of the existing semi-dry desulfurization process are difficult to reuse, and are generally treated in a stacking or landfill mode, so that the treatment can reduce the disposal cost of waste, but is not an environment-friendly treatment means. And the prior semi-dry desulfurization process has low utilization rate of the absorbent, and the absorbent mixed in the final product can not be effectively recycled, thereby causing a great deal of waste and secondary pollution of the absorbent.
Except SO in sintering flue gas2Usually, 5000-15000mg/Nm3At present, the treatment of CO in the sintering flue gas is a blank, so that the surplus energy of CO cannot be recovered, energy waste is caused, and meanwhile, the emission of CO also causes atmospheric pollution.
Theoretically, feasible CO removing methods comprise a catalytic oxidation method and a flameless combustion oxidation method, and compared with the catalytic oxidation method, the flameless combustion oxidation method can adapt to more complex sintering smoke components, avoids catalyst poisoning caused by harmful components, and can synchronously remove dioxin while carrying out flameless combustion on CO, so that the flameless combustion oxidation method has better industrial prospect.
The existing CO flameless combustion processing technology is relatively mature in application of a waste gas incinerator, and the principle is that the temperature of CO-containing sintering flue gas is raised to a reaction temperature by using heat generated by combustion of auxiliary fuel, so that oxidative decomposition is generated. For the combustion process of CO in the waste gas incinerator, the requirement of the lowest ignition temperature is met, and the ignition area is limited, so that the CO cannot be violently combusted below the lowest ignition temperature; but in the ignition area, the ignition speed increases along with the temperature rise, the temperature continues to rise, and the conversion rate curve is transited from gentle to steep, namely, an inflection point exists. The CO combustion process goes from non-combustible (<639 ℃) to a start-up to a violent combustion. The ignition temperature of the sintering flue gas CO is 639 ℃, the deflagration temperature is 700-710 ℃, and the ignition stage is 639-700 ℃. According to related data, the combustion of CO at the deflagration temperature (710 ℃) is only 0.05s, and the engineering design can be designed according to 1-2 s.
Except for SO2Besides CO, the sintering flue gas also comprises nitrogen oxides, wherein the ultralow emission of the steel industry is gradually promoted, and the emission concentration of NOx is required to be not higher than 50mg/Nm3The prior denitration process comprises an SCR denitration process and an SNCR denitration process, wherein the SCR denitration process refers to that ammonia gas selectively reacts with nitrogen oxide through reduction and desorption reaction under the action of a catalyst and in the presence of oxygen to generate nitrogen and water, but does not react with oxygen in flue gas through oxidation. However, the SCR denitration process is prone to poisoning of the cyanamide sulfite catalyst and clogging of the heat exchanger, and cannot remove carbon monoxide and dioxin from flue gas. The SNCR denitration process is characterized in that under the condition that no catalyst is adopted, an amino reducing agent such as ammonia or urea is uniformly sprayed into a flue in the front of a separator, the reducing agent is rapidly decomposed in a furnace and reacts with nitrogen oxide in flue gas to generate nitrogen and water, so that the aim of denitration is fulfilled, however, the existing SNCR reaction needs to be controlled at a hearth position corresponding to a narrow flue gas temperature range and is difficult to be carried out with other flue gas temperature rangesThe coupling is achieved by the processing technology.
In the prior art, for the removal of different pollutants, in order to ensure the removal effect, a mode of independent removal and sequential treatment is usually adopted, and a cooperative treatment system and a method capable of realizing 'one-time treatment and synchronous removal' of different pollutants are lacked.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention improves the environment-friendly sintering flue gas treatment system, and the system can remove carbon monoxide and dioxin while realizing desulfurization and denitration and has the beneficial effect of cooperatively treating solid waste.
The invention aims to provide a sintering flue gas co-processing system which can simultaneously remove sulfur oxides, nitrogen oxides, carbon monoxide and dioxin contained in flue gas, avoid secondary pollution caused by solid waste and realize a synergistic effect of mutual promotion in a multi-component removal process.
The invention also aims to provide a sintering flue gas co-processing method, which uses the sintering flue gas co-processing system to simultaneously reduce the content of various harmful components in the sintering flue gas to be below a standard value and avoid secondary pollution caused by solid waste.
The invention also aims to provide application of the sintering flue gas co-processing system in sintering flue gas treatment and pelletizing flue gas treatment.
In order to achieve the purpose, the invention provides a sintering flue gas cooperative treatment system which comprises a flue gas conveying pipeline and equipment connected in series by the flue gas conveying pipeline, wherein the equipment sequentially comprises an internal heating type reactor, a cyclone dust collector, a rapid cooler, a desulfurizing tower, a dust collector, an induced draft fan and a gas external exhaust device according to the flue gas conveying direction; the bottom of the desulfurization tower is also provided with a separator; at least one solid waste conveying pipeline is arranged between the devices, and the solid waste conveying direction in the solid waste conveying pipeline is opposite to the flue gas conveying direction; the bottom of the internal heating type reactor is provided with a booster fan and a combustion-supporting air pipeline, and the combustion-supporting air pipeline is connected with the combustion-supporting fan; an SNCR denitration device is arranged between the internal heating type reactor and the cyclone dust collector; an SCR denitration device is arranged in the rapid cooler; the internal heating type reactor is also connected with a fuel supply device.
Preferably, the gas discharge device comprises an atmospheric discharge device; further preferably, the gas discharge device comprises a chimney.
The solid waste conveying pipeline can convey solid waste containing a large amount of calcium sulfite generated after the sintering flue gas is desulfurized back to the upstream treatment system, so that secondary treatment of the solid waste is realized, meanwhile, the reduction capacity of the calcium sulfite is utilized, primary treatment is carried out on the sintering flue gas, the solid waste is fully utilized, and a remarkable synergistic effect is formed between solid waste treatment and sintering flue gas treatment.
The internal heating reactor adopts combustible gas such as carbon-containing solid waste or blast furnace gas and the like as a heat source to heat the sintering flue gas, so that CO and dioxin in the sintering flue gas are removed after oxidation combustion, and simultaneously, heat is additionally released, and the removal treatment of sulfur components in the sintering flue gas by the once-treated solid waste is further promoted. The booster fan and the combustion-supporting air duct pipe at the bottom of the internal thermal reactor can simultaneously blow sintering flue gas, and the control of the retention time of the sintering flue gas in the internal thermal reactor is realized by adjusting the flow and the flow velocity of the sintering flue gas, so that the subsequent adjustment of the removal effect of various components is realized. The temperature in the internal thermal reactor is rapidly raised to the combustion temperature of CO by the heat released by the combustion of the combustible components, and the combustion of the CO further raises the temperature in the internal thermal reactor, so that the conversion process of SNCR treatment and primary solid waste to secondary solid waste is promoted, thereby realizing the sufficient absorption of various gases and obtaining the effect of synergistic treatment.
In an optional embodiment, the fuel is solid waste fuel, a solid waste fuel storage device is arranged at the upstream of the internal thermal reactor, a solid waste conveying pipeline is arranged between the solid waste fuel storage device and the bottom of the dust remover, and a heat source is provided for heating the sintering flue gas by adding and igniting carbon-containing solid waste fuel into the internal thermal reactor.
Preferably, the solid waste fuel storage device (3) is connected with the internal heating type reactor (5) through a feeding device (16).
In an alternative embodiment, the fuel is a combustible gas, and the internal thermal reactor is provided with at least one gas combustion device, and the combustible gas is ignited to provide heat for heating the sintering flue gas.
Preferably, the combustible gas comprises blast furnace gas;
further preferably, the blast furnace gas comprises steel plant blast furnace gas.
In an optional embodiment, the SCR denitration device is arranged in a region with the temperature of 350-400 ℃ in the rapid cooler.
On the other hand, the invention also provides a method for carrying out cooperative treatment on the sintering flue gas by adopting the cooperative treatment system for the sintering flue gas, wherein the cooperative treatment method comprises the steps of dividing the sintering flue gas to be treated into two parts, respectively blowing the two parts into the internal heating type reactor through a booster fan and a combustion fan, flowing along a flue gas conveying pipeline after combustion, finally realizing treatment and discharge through a gas discharge device, and conveying primary solid waste generated in the cooperative treatment process back to upstream equipment in the flue gas conveying direction through a solid waste conveying pipeline for secondary treatment.
Preferably, the sintering flue gas comprises sintering machine head flue gas.
In a possible embodiment, the sintering flue gas is subjected to an internal thermal reactor in a pulsed manner under the action of a combustion fan.
In a feasible implementation mode, the temperature in the internal thermal reactor (5) is adjusted to be 800-1050 ℃, and the oxygen content in the space below the combustion-supporting air pipeline (4) in the internal thermal reactor (5) is less than 2%.
In the space below a combustion air pipeline of the internal thermal reactor, oxidation and reduction reactions simultaneously exist in nitrogen oxides carried in sintering flue gas, when the temperature is controlled below 1050 ℃, and the oxygen content of the sintering flue gas is less than 2%, the reduction rate of the nitrogen oxides is greater than the oxidation rate, so that the nitrogen oxides with the volume fraction of 70% can be reduced into nitrogen and water in the internal thermal reactor, and the oxygen content includes but is not limited to 0.5%, 1%, 1.5% or 1.8%.
In a feasible implementation mode, the gas flow velocity in a connecting channel between the internal heating type reactor and the cyclone dust collector is 20-30 m/s, a narrow communicating pipeline is arranged between the internal heating type reactor and the cyclone dust collector, sintering flue gas in the internal heating type reactor forms high-pressure gas under the combined action of a booster fan and combustion heat release, and the cyclone dust collector is huge in space and low in gas pressure, so that the gas flow velocity in the communicating pipeline between the internal heating type reactor and the cyclone dust collector is increased suddenly. Set up SNCR denitrification facility here, then can make sintering flue gas and denitrifier intensive mixing through adjustment gas velocity of flow to improve denitration reaction efficiency, guarantee the ammonia in the flue 800 ~ 1050 ℃ temperature interval in dwell time not less than 5 seconds simultaneously.
In a possible embodiment, the cooling rate of the rapid cooler is 200 ℃/s to 300 ℃/s.
Above-mentioned rapid cooling ware can be in 4s time, will spin the sintering flue gas in the wind dust remover and follow 900 ℃ of cooling to 140 ℃, through the regulation of water supply capacity, can the not co-altitude temperature value in the accurate control rapid cooling ware, therefore, can be according to the high sensitivity of SCR denitrification facility to the temperature, set up the temperature window in the inside 350 ~ 400 ℃ of rapid cooling ware position, and add and establish SCR denitrification facility, utilize the ammonia that escapes among the SNCR denitrification facility and the nitrogen oxide reaction realization denitration in the sintering flue gas, make the nitre content in the sintering flue gas reach national emission standard.
The third aspect of the invention provides an application of the sintering flue gas co-processing system and/or the sintering flue gas co-processing method in sintering flue gas processing and/or pelletizing flue gas processing.
The invention has the following beneficial effects:
the invention can realize the cooperative disposal of various pollutants, the internal thermal reactor effectively controls the discharge amount of carbon monoxide, and simultaneously reduces the pollution of dioxin; the heat released by the combustion of the carbon monoxide and the dioxin further assists the internal thermal reactor in treating other solid wastes, the by-products of the synergistic treatment system provided by the invention are stable components such as calcium sulfate and the like, unstable components such as calcium sulfite and the like are not generated, the by-products can be used as cement raw materials, and the capability of the internal thermal reactor in synergistically treating the solid wastes has double environmental protection benefits.
Dioxin exists in sintering flue gas, and the solid waste fuel can also generate the dioxin during combustion, and the conventional content of the dioxin in the flue gas entering the internal heating type reactor is 3-50ng-TEQ/Nm3. Dioxin is a chloro-oxygenated tricyclic aromatic compound, can be completely decomposed at a temperature range of 850-1000 ℃, and can be fully synthesized again after staying for 4-5 seconds at a temperature range of 200-400 ℃. The method for treating the dioxin in the sintering flue gas comprises the step of burning the solid waste fuel to release heat so that the temperature of the flue gas in the hearth is in the range of 850-1000 ℃, and thus the dioxin in the flue gas is completely decomposed and is converged into the rapid cooler along with the flue gas. The rapid cooler is used for reducing the temperature of the flue gas, the temperature of the flue gas is reduced to 450 ℃ after the flue gas reaches a distance before the outlet of the rapid cooler, at the moment, the rapid cooling design is adopted in the temperature section, so that the time for reducing the temperature of the flue gas from 450 ℃ to below 200 ℃ is shortened to below 2s, the retention time of dioxin in a resynthesis temperature interval is greatly shortened, the great regeneration of the dioxin is inhibited, and finally the content of the dioxin is controlled to be 0.3ng-TEQ/Nm3The purpose of removing dioxin is achieved as follows.
Carbon monoxide exists in the sintering flue gas, and solid waste fuel can be generated when the solid waste fuel is incompletely combusted below a combustion-supporting air pipeline, and the content of the carbon monoxide in the flue gas is less than 1 percent and far lower than the explosion limit (more than 10 percent). The carbon monoxide has an ignition point of over 800 ℃ under the condition of sufficient oxygen. The internal heating type reactor has sufficient oxygen content, and carbon monoxide in the flue gas can be completely combusted at the temperature of 850-1000 ℃ to generate carbon dioxide without being generated again.
The temperature of the part below the combustion-supporting air pipeline of the internal heating type reactor is controlled to be below 1050 ℃, the oxygen content of the part of the flue gas is less than 2%, when the oxygen content is less than 2%, the atmosphere in the region coexists with oxidation and reduction, and nitrogen oxides brought in by the sintering flue gas in the region are reduced into nitrogen and water, so that the denitration efficiency and the denitration stability are improved, the consumption of a denitration agent is reduced, the consumption of a denitration catalyst is reduced, the denitration cost is lower, and the denitration method is more environment-friendly.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a system for co-processing sintering flue gas provided in embodiment 1 of the present invention.
Icon: 1 is combustion fan, 2 is booster fan, 3 is solid useless fuel storage device, 4 is combustion-supporting wind pipeline, 5 is interior hot type reactor, 6 is cyclone, 7 is rapid cooling device, 8 is the desulfurizing tower, 9 is the dust remover, 10 is the chimney, 11 is the draught fan, 12 is solid useless pipeline, 13 is the separator, 14 is SNCR denitrification facility, 15 is SCR denitrification facility, 16 is feeder, 17 is gas combustion device, A is the ash bin.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The components of 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.
In the description of the present invention, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally placed when products of the application are used, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
The embodiment provides a sintering flue gas co-processing system, as shown in fig. 1, which includes a flue gas conveying pipeline and equipment connected in series by the flue gas conveying pipeline, wherein the equipment sequentially includes an internal heating type reactor 5, a cyclone dust collector 6, a rapid cooler 7, a desulfurizing tower 8, a dust collector 9, an induced draft fan 11 and a chimney 10 according to a flue gas conveying direction; the bottom of the desulfurizing tower 8 is also provided with a separator 13; the bottom of the internal heating type reactor 5 is provided with a booster fan 2 and a combustion-supporting air pipeline 4, and the combustion-supporting air pipeline 4 is connected with a combustion-supporting fan 1; a solid waste fuel storage device 3 is further arranged at the upstream of the internal thermal reactor 5, the solid waste fuel storage device 3 is connected with the internal thermal reactor 5 through a force supply device 16, a solid waste conveying pipeline 12 is arranged between the solid waste fuel storage device 3 and the bottom of the dust remover 9, ash in the separator 13 is conveyed to an ash bin, and the conveying direction of solid waste in the solid waste conveying pipeline 12 is from the dust remover 9 to the solid waste fuel storage device 3; the sintering flue gas co-processing system also comprises an SNCR (selective non-catalytic reduction) denitration device 14 and an SCR denitration device 15; the SNCR denitration device 14 is arranged between the internally heated reactor 5 and the cyclone dust collector 6; the SCR denitration device is arranged at the position with the temperature of 350-400 ℃ in the rapid cooler 7.
Example 2
The embodiment provides a method for performing synergistic treatment on sintering flue gas in the steel smelting industry by using the system for performing synergistic treatment on sintering flue gas provided by embodiment 1, and the method for performing synergistic treatment comprises the steps of blowing the sintering flue gas to be treated into an internal heating type reactor 5 through a booster fan 2, blowing the sintering flue gas through a combustion fan 1 in a pulse mode, adjusting the air volume of the booster fan and the pulse parameters of the combustion fan to enable the oxygen content to be 1.8%, adjusting the internal temperature of the internal heating type reactor to be 800-1050 ℃, and enabling the flow velocity of the flue gas at the cross section of a communication pipeline between the internal heating type reactor 5 and a cyclone dust collector 6 to be 25 m/s. And finally, the solid waste generated by the dust remover 9 is conveyed back to the solid waste fuel storage device 3 through the solid waste conveying pipeline 12 and then enters the internal heating type reactor 5 for secondary treatment, and the treated solid waste is converted into stable solid ash. Flue gas disturbance is carried out by utilizing combustion-supporting air in the internal heating type reactor 5, the speed of the combustion-supporting fan (1) blowing into the reactor is controlled by adjusting a valve of a combustion-supporting air pipeline (4), irregular pulse airflow is formed, flue gas in the reactor is disturbed, the retention time of the flue gas in the reactor is ensured to be more than 3 seconds, and the carbon monoxide and the dioxin are ensured to be treated completely.
Example 3
The embodiment provides a method for performing synergistic treatment on sintering flue gas in the steel smelting industry by using the system for performing synergistic treatment on sintering flue gas provided by embodiment 1, wherein the method for performing synergistic treatment on the sintering flue gas comprises the steps of blowing the sintering flue gas to be treated into an internal heating type reactor 5 through a booster fan 2, blowing the sintering flue gas through a combustion fan 1 in a pulse mode, adjusting the air quantity of the booster fan and the pulse parameters of the combustion fan to enable the oxygen content to be 1.0%, the internal temperature of the internal heating type reactor to be 800-1050 ℃, enabling the sintering flue gas to flow along a flue gas conveying pipeline after being combusted in the internal heating type reactor 5, and enabling the cross-section flue gas flow velocity of a communicating pipeline between the internal heating type reactor 5 and a cyclone dust collector 6 to be 20 m. And finally, the solid waste generated by the dust remover 9 is conveyed back to the solid waste fuel storage device 3 through the solid waste conveying pipeline 12 and then enters the internal heating type reactor 5 for secondary treatment, and the treated solid waste is converted into stable solid ash.
Example 4
The embodiment provides a method for performing synergistic treatment on sintering flue gas in the steel smelting industry by using the system for performing synergistic treatment on sintering flue gas provided by embodiment 1, wherein the method for performing synergistic treatment on the sintering flue gas comprises the steps of blowing the sintering flue gas to be treated into an internal heating type reactor 5 through a booster fan 2, blowing the sintering flue gas through a combustion fan 1 in a pulse mode, adjusting the air quantity of the booster fan and the pulse parameters of the combustion fan to enable the oxygen content to be 0.5%, the internal temperature of the internal heating type reactor to be 800-1050 ℃, enabling the sintering flue gas to flow along a flue gas conveying pipeline after being combusted in the internal heating type reactor 5, and enabling the cross-section flue gas flow velocity of a communicating pipeline between the internal heating type reactor 5 and a cyclone dust collector 6 to be 30 m. And finally, the solid waste generated by the dust remover 9 is conveyed back to the solid waste fuel storage device 3 through the solid waste conveying pipeline 12 and then enters the internal heating type reactor 5 for secondary treatment, and the treated solid waste is converted into stable solid ash.
Comparative example 1
The comparative example provides a method for carrying out synergistic treatment on sintering flue gas in the steel smelting industry, and the method is only different from the embodiment 2 in that dioxin in the flue gas cannot be decomposed and removed when the temperature in the internal heating type reactor 5 is less than 800 ℃ and the temperature is less than 800 ℃, and the SNCR denitration reduction reaction cannot be carried out at the same time, so that the denitration efficiency is low, and the cost is increased.
Comparative example 2
The comparative example provides a method for carrying out synergistic treatment on sintering flue gas in the steel smelting industry, and only the difference from the example 2 is that the temperature in the internal heating type reactor 5 is higher than 1050 ℃, the whole size and investment of equipment are increased under the condition, the requirement on heat-insulating materials is greatly improved, thermal nitrogen oxides are generated in the reactor when the temperature is higher than 1050 ℃, the denitration cost is increased, and the denitration efficiency is reduced.
Comparative example 3
The comparative example provides a method for carrying out synergistic treatment on sintering flue gas in the steel smelting industry, and the method is only different from the method in the example 2 in that the oxygen content in the reactor 5 is adjusted to be 6%, in this case, nitrogen oxide is secondarily produced in the internal heating type reactor 5, and the denitration load denitration efficiency is increased.
Comparative example 4
The comparative example provides a method for performing synergistic treatment on sintering flue gas in the steel smelting industry, and the method is only different from the embodiment 2 in that a solid waste conveying pipeline 12 is arranged in the synergistic treatment system for sintering flue gas, and the finally obtained solid waste contains 55% of calcium sulfite by mass.
The denitration efficiency, desulfurization efficiency, dioxin removal rate, carbon monoxide removal rate and secondary pollutant emission results of the above examples 2 to 4 are shown in table 1.
Table 1 comparative table of sintering fume treatment results of examples 2 to 4
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A sintering flue gas cooperative processing system comprises a flue gas conveying pipeline and equipment connected in series by the flue gas conveying pipeline, and is characterized in that the equipment sequentially comprises an internal heating type reactor (5), a cyclone dust collector (6), a rapid cooler (7), a desulfurizing tower (8), a dust collector (9), an induced draft fan (11) and a gas external exhaust device according to the flue gas conveying direction; a separator (13) is arranged at the bottom of the desulfurizing tower (8); at least one solid waste conveying pipeline (12) is arranged between the devices, and the solid waste conveying direction in the solid waste conveying pipeline (12) is opposite to the flue gas conveying direction; the bottom of the internal heating type reactor (5) is provided with a booster fan (2) and a combustion-supporting air pipeline (4), and the combustion-supporting air pipeline (4) is connected with a combustion-supporting fan (1); an SNCR denitration device (14) is arranged between the internal heating type reactor (5) and the cyclone dust collector (6); an SCR denitration device (15) is arranged in the rapid cooler (7); the internal heating type reactor (5) is also connected with a fuel supply device;
preferably, the gas discharge device comprises an atmospheric discharge device;
further preferably, the gas discharge device comprises a chimney (10).
2. The sintering flue gas coprocessing system of claim 1, wherein the fuel is solid waste fuel, a solid waste fuel storage device (3) is arranged at the upstream of the internal thermal reactor (5), and a solid waste conveying pipeline (12) is arranged between the solid waste fuel storage device (3) and the bottom of the dust remover (9);
preferably, the solid waste fuel storage device (3) is connected with the internal heating type reactor (5) through a feeding device (16).
3. The synergistic treatment system for the sintering flue gas as claimed in claim 1 or 2, wherein the fuel is combustible gas, and at least one gas combustion device is arranged on the internal thermal reactor (5);
preferably, the combustible gas comprises blast furnace gas;
further preferably, the blast furnace gas comprises steel plant blast furnace gas.
4. The sintering flue gas co-processing system according to claim 1, wherein the SCR denitration device (15) is arranged in a region with a temperature of 350-400 ℃ in the rapid cooler (7).
5. The method for performing the synergistic treatment on the sintering flue gas by adopting the synergistic treatment system for the sintering flue gas as claimed in any one of claims 1 to 4, which is characterized in that the synergistic treatment method comprises the steps of dividing the sintering flue gas to be treated into two parts, respectively blowing the two parts into an internal heating type reactor (5) through a booster fan (2) and a combustion fan (1), flowing along a flue gas conveying pipeline after combustion, finally realizing the discharge after treatment through a gas discharge device, and conveying primary solid waste generated in the synergistic treatment process back to upstream equipment in the flue gas conveying direction through a solid waste conveying pipeline (12) for secondary treatment;
preferably, the sintering flue gas comprises sintering machine head flue gas.
6. A method according to claim 5, characterized in that the sintering flue gas is subjected to an internal thermal reactor (5) in a pulsed manner by means of a combustion fan (1).
7. The method according to claim 5, characterized in that the temperature in the internal thermal reactor (5) is adjusted to 800-1050 ℃, and the oxygen content in the space below the combustion-supporting air pipe (4) in the internal thermal reactor (5) is less than 2%.
8. A method according to claim 5, characterized in that the gas velocity in the connecting channel between the internal thermal reactor (5) and the cyclone (6) is 20-30 m/s.
9. The method according to claim 5, characterized in that the cooling rate of the rapid cooler (7) is 200 ℃/s to 300 ℃/s.
10. Use of the system for co-processing sintering flue gas according to any one of claims 1 to 4 and/or the method according to any one of claims 5 to 9 for sintering flue gas processing and/or pelletizing flue gas processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011235012.4A CN112275108A (en) | 2020-11-08 | 2020-11-08 | Sintering flue gas co-processing system, flue gas processing method and application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011235012.4A CN112275108A (en) | 2020-11-08 | 2020-11-08 | Sintering flue gas co-processing system, flue gas processing method and application |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112275108A true CN112275108A (en) | 2021-01-29 |
Family
ID=74350774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011235012.4A Pending CN112275108A (en) | 2020-11-08 | 2020-11-08 | Sintering flue gas co-processing system, flue gas processing method and application |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112275108A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112815730A (en) * | 2021-02-10 | 2021-05-18 | 秦皇岛新特科技有限公司 | Sintering flue gas treatment equipment |
-
2020
- 2020-11-08 CN CN202011235012.4A patent/CN112275108A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112815730A (en) * | 2021-02-10 | 2021-05-18 | 秦皇岛新特科技有限公司 | Sintering flue gas treatment equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110860196B (en) | Desulfurization and denitrification system for cement flue gas | |
| CN105944564A (en) | Coke oven flue gas waste heat recycling, desulfurization and denitration integrated system and method | |
| CN103453538B (en) | A kind of minimum discharge CFBB with three grades of desulphurization systems | |
| CN104174265B (en) | The method of carbon system reducing agent SCR denitration technology abatement high-temperature calcination NOx | |
| CN109364711A (en) | A kind of flue gas system for the ultra-clean processing of cement kiln tail gas | |
| CN110513693B (en) | Sludge incineration method | |
| CN110665352A (en) | Dry desulfurization, denitrification and dust removal device and method for low-sulfur flue gas in cement kiln tail | |
| CN106969641A (en) | One kind sintering flue gas decomposes bioxin desulphurization denitration recovery waste heat system and method from combustion-supporting | |
| CN203549871U (en) | Novel ultra-low emission circulating fluidized bed boiler | |
| CN209490672U (en) | A kind of flue gas system for the ultra-clean processing of cement kiln tail gas | |
| CN211358316U (en) | Low-sulfur flue gas dry desulfurization denitration dust collector in cement kiln tail | |
| CN112121614A (en) | Stable ultralow emission device and method for solid waste incineration flue gas | |
| CN111346605A (en) | Pollutant comprehensive treatment system and method suitable for large coal-fired power plant | |
| CN111715070A (en) | Ultra-clean discharge system and method for desulfurization and denitrification treatment of boiler flue gas | |
| CN109482049A (en) | A kind of coke oven flue gas dry desulfurization denitration purification integral process | |
| CN112403154A (en) | Flue gas multi-pollutant cooperative purification process and device | |
| CN107270713A (en) | A kind of ultra-clean discharge sintering system of iron ore thermal coupling and method | |
| CN112275108A (en) | Sintering flue gas co-processing system, flue gas processing method and application | |
| CN106178877A (en) | A kind of coke oven flue waste gas purification waste heat recovery apparatus and technique | |
| Wu et al. | Experimental investigation of cutting nitrogen oxides emission from cement kilns using coal preheating method | |
| CN210495844U (en) | Flue gas desulfurization, decarbonization and denitration cooperative treatment system | |
| CN107166963A (en) | A kind of agglomeration for iron mine system and method | |
| CN213725710U (en) | Sintering flue gas coprocessing system | |
| CN206463781U (en) | A kind of desulfuring and denitrifying apparatus of coke oven flue gas | |
| CN207527606U (en) | A kind of system of high temperature incineration method processing acrylic nitrile waste water |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |