CN112503535A - Low NOXPollutant garbage incinerator - Google Patents
Low NOXPollutant garbage incinerator Download PDFInfo
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- CN112503535A CN112503535A CN202011191254.8A CN202011191254A CN112503535A CN 112503535 A CN112503535 A CN 112503535A CN 202011191254 A CN202011191254 A CN 202011191254A CN 112503535 A CN112503535 A CN 112503535A
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- flue gas
- incinerator
- nozzle
- recirculated
- secondary air
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 177
- 239000003546 flue gas Substances 0.000 claims abstract description 176
- 238000002485 combustion reaction Methods 0.000 claims abstract description 56
- 239000001301 oxygen Substances 0.000 claims abstract description 28
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 28
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000002699 waste material Substances 0.000 claims abstract description 20
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 18
- 231100000719 pollutant Toxicity 0.000 claims abstract description 18
- 230000003134 recirculating effect Effects 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 11
- 239000002893 slag Substances 0.000 claims description 9
- 238000000746 purification Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000004064 recycling Methods 0.000 description 12
- 238000002156 mixing Methods 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 238000004939 coking Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 238000004056 waste incineration Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000001706 oxygenating effect Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
- F23G5/04—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment drying
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/50—Control or safety arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
- F23J1/02—Apparatus for removing ash, clinker, or slag from ash-pits, e.g. by employing trucks or conveyors, by employing suction devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L1/00—Passages or apertures for delivering primary air for combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2203/00—Furnace arrangements
- F23G2203/101—Furnace arrangements with stepped or inclined grate
Abstract
The application provides a waste incinerator of low NOx pollutant includes: the incinerator grate is used for incinerating the garbage positioned on the incinerator grate, and combustion flue gas generated by incineration is discharged from the incinerator mouth through the incinerator throat area; the primary air device is used for feeding primary air below the incineration grate to provide oxygen for incineration; the secondary air device is used for providing secondary air into the incinerator through a secondary air nozzle positioned in the throat area of the incinerator so as to adjust the oxygen amount in the garbage incinerator; the first recirculated flue gas nozzle and the secondary air nozzle are arranged in a staggered manner and used for sending the recirculated flue gas into the furnace to be mixed with the combustion flue gas in the furnace; and the second recirculated flue gas nozzle is positioned on the rear arch above the incineration grate and used for sending the recirculated flue gas into the combustion area to be mixed with the combustion flue gas so as to reduce the oxygen content in the incinerator. According to the garbage incinerator, the NOx pollutant generation amount is low, the garbage incinerator is stable and reliable in operation, the performance of the garbage incinerator is fundamentally improved, and the denitration pressure behind the incinerator is reduced.
Description
Technical Field
The application relates to the technical field of environmental protection, and more particularly relates to waste incineration.
Background
At present, the research and application of low NOx pollutants based on a garbage incinerator are few, particularly, the research on a flue gas recirculation technology is not deep enough, for example, the oxygen quantity regulation and control requirement is difficult to meet only replacing conventional secondary air; the recirculated mixed secondary air is easy to cause dewing corrosion; or only a certain position is selected to arrange the recirculation nozzle, and the technical effect of flue gas recirculation is not fully exerted. The waste incineration mostly depends on the denitration technology after the furnace, such as SNCR, SCR and the like, the SNCR denitration process efficiency is limited, the SCR denitration process investment cost and the operation cost are high, and especially the catalyst regeneration aspect is realized.
Disclosure of Invention
The present application has been made in view of the above problems. The present application provides a low NOx pollutant waste incinerator to solve at least one of the above problems.
According to a first aspect of the present application there is provided a low NOx pollutant waste incinerator comprising:
the incinerator grate is used for incinerating the garbage positioned on the incinerator grate, and combustion flue gas generated by incineration is discharged from the incinerator mouth through the incinerator throat area;
the primary air device is used for feeding primary air below the incineration grate to provide oxygen for the incineration;
the secondary air device is used for providing secondary air into the incinerator through a secondary air nozzle positioned in the throat area of the incinerator so as to adjust the oxygen amount in the garbage incinerator;
the first recirculated flue gas nozzle and the secondary air nozzle are arranged in a staggered mode and used for sending recirculated flue gas into the furnace to be mixed with the combustion flue gas in the furnace;
and the second recirculated flue gas nozzle is positioned on the rear arch above the incineration grate and used for sending the recirculated flue gas into the combustion area to be mixed with the combustion flue gas so as to reduce the oxygen content in the incinerator.
Optionally, the first recirculated flue gas nozzle and the secondary air nozzle are arranged alternately on the front wall and/or the rear wall of the throat area of the incinerator.
Optionally, the first recirculating flue gas nozzles and the secondary air nozzles arranged on the front wall and/or the rear wall are in the same height or staggered up and down.
Optionally, the second recirculated flue gas nozzle is inclined vertically downwards or towards the incinerator throat area.
Optionally, at least one of the first recirculation flue gas nozzle, the second recirculation flue gas nozzle, or the overfire air nozzle comprises a straight pipe section and a divergent pipe having a divergence angle of between 10 ° and 20 °.
Optionally, the waste incinerator further comprises:
and the recirculating flue gas device is connected with the first recirculating flue gas nozzle and the second recirculating flue gas nozzle and is used for sending the recirculating flue gas into the first recirculating flue gas nozzle and the second recirculating flue gas nozzle.
Optionally, the waste incinerator further comprises:
a first valve located between the first recirculated flue gas nozzle and the recirculated flue gas device for adjusting the flue gas volume of the first recirculated flue gas nozzle;
and the second valve is positioned between the second recirculation flue gas nozzle and the recirculation flue gas device and is used for adjusting the flue gas volume of the second recirculation flue gas nozzle.
Optionally, the combustion flue gas discharged from the incinerator mouth through the incinerator throat area is fed into a flue gas purification device to obtain the recycled flue gas.
Optionally, the waste incinerator further comprises:
and the feeding hole is positioned at the inlet of the incineration grate and used for conveying the garbage to the incineration grate.
Optionally, the waste incinerator further comprises:
and the slag outlet is positioned at the tail end of the incineration grate and used for discharging the material slag generated by incineration.
According to the waste incinerator of this application embodiment, through the crisscross setting of the nozzle with recirculation flue gas and overgrate air, practice thrift space and cost, reach the air current intensive mixing, can in time the oxygenating when realizing reducing the NOx pollutant, and NOx pollutant formation volume is low, reliable and stable operation, convenient effective regulation and control, and fundamentally improves and burns the burning furnace performance, reduces the denitration pressure behind the stove.
Drawings
The above and other objects, features and advantages of the present application will become more apparent by describing in more detail embodiments of the present application with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings, like reference numbers generally represent like parts or steps.
FIG. 1 is a schematic diagram of a low NOx pollutant waste incinerator according to an embodiment of the present application;
FIG. 2 is an example of a distribution of recirculated flue gas nozzles and overfire air nozzles in accordance with an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, exemplary embodiments according to the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the described embodiments are only some embodiments of the present application and not all embodiments of the present application, and that the present application is not limited by the example embodiments described herein. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the application described in the application without inventive step, shall fall within the scope of protection of the application.
Incinerator incineration treatment is a widely used garbage treatment technology at present, can realize recycling and reduction, but has a problem of pollutant emission control in the operation process. NOx has bad influence on the environment, the generation amount of NOx in the incinerator is large, the denitration cost is high, and the control of NOx pollutants is particularly important. The flue gas recirculation refers to a low-nitrogen combustion technology for returning low-temperature and low-oxygen flue gas after combustion to a main combustion area in a furnace and participating in the combustion process again to reduce the generation amount of NOx, and the flue gas recirculation is widely applied to coal-fired and gas-fired boilers by changing the environmental atmosphere (oxygen amount and temperature) and inhibiting the conversion rate of NOx intermediate products to NO.
At present, the research and application of low NOx pollutants based on a garbage incinerator are few, particularly, the research on a flue gas recirculation technology is not deep enough, for example, the oxygen quantity regulation and control requirement is difficult to meet only replacing conventional secondary air; the recirculated mixed secondary air is easy to cause dewing corrosion; or only a certain position is selected to arrange the recirculation nozzle, and the technical effect of flue gas recirculation is not fully exerted. The waste incineration mostly depends on the denitration technology after the furnace, such as SNCR, SCR and the like, the SNCR denitration process efficiency is limited, the SCR denitration process investment cost and the operation cost are high, and especially the catalyst regeneration aspect is realized.
In view of the above, a garbage incinerator with low NOx pollutants is provided according to an embodiment of the present application. Referring to fig. 1, fig. 1 shows a schematic structural view of a garbage incinerator with low NOx pollutants according to an embodiment of the present application. As shown in fig. 1, the low NOx pollutant waste incinerator 100 comprises:
the incinerator grate 110 is used for incinerating the garbage on the incinerator grate 110, and combustion flue gas generated by incineration is discharged from an incinerator opening 160 through an incinerator throat area 150;
a primary air device 120 for supplying primary air below the incineration grate 110 to provide oxygen for the incineration;
a secondary air device 130 for supplying secondary air into the incinerator through a secondary air nozzle 131 positioned at the throat area 150 of the incinerator to adjust the oxygen amount in the garbage incinerator;
the first recirculated flue gas nozzle 140 is arranged in a staggered manner with the secondary air nozzle 131 and is used for sending recirculated flue gas into the furnace to be mixed with the combustion flue gas in the furnace;
a second recirculated flue gas nozzle 170 is positioned in the rear arch above the incinerator grate 110 for feeding recirculated flue gas into the combustion zone for mixing with the combustion flue gas to reduce the oxygen content in the furnace.
The garbage is pushed onto an incineration grate, high-temperature flue gas radiation in the incinerator is absorbed, the garbage is sequentially dried, combusted and burnt out under the action of primary air fed below the incineration grate, material slag is discharged from the tail end of the grate, and a secondary air nozzle is positioned in a throat area of the incinerator for auxiliary combustion and promotion of air flow mixing; the recirculated flue gas enters the incinerator from the throat area and the rear arch area of the incinerator, and the recirculated flue gas is mixed with the combustion flue gas. Wherein, the primary air of the incinerator provides the main oxygen amount; the secondary air can adjust the oxygen content in the furnace to ensure complete combustion; the recirculated flue gas plays a role in low-nitrogen combustion, and all levels of air distribution are independently controlled and matched with each other, so that the operation and regulation are convenient, the oxygen amount in the incinerator is reduced, the low-nitrogen combustion is realized, and the deep in-furnace NOx removal is realized. Is suitable for being widely applied to occasions of garbage incinerators.
In some embodiments, as shown in FIG. 1, the second recirculated flue gas nozzle 170 may be positioned in the rear arch above the combustion grate 110. In some embodiments, the second recirculated flue gas nozzle 170 may be specifically positioned at a rear arch corresponding to the third or fourth grate of the combustion grate 110. Further, the second recirculated flue gas nozzle may be vertically downward or may be slightly inclined at a small angle to the throat area. Because the third four-section grate is usually positioned in the combustion section of the incinerator, the recirculated flue gas can be fully mixed with the combustion flue gas, so that the oxygen content of the main combustion area is reduced, and the generation amount of fuel type NOx occupying the main body is reduced; the mixing of the flue gas produces enough disturbance to promote full combustion; the high temperature zone of the main combustion zone, including the throat area, is broken up, the temperature distribution is relatively uniform, and the coking of the hearth can be relieved. The flow velocity of the second recirculation nozzle can be controlled within the range of 20-60 m/s, the mixing degree of the flue gas is insufficient when the velocity is too low, the surface of a material layer can be impacted when the flow velocity is too high, the control on a live wire is possibly influenced, the primary air temperature can be properly increased when necessary, and the stable combustion of the material layer is further ensured. Namely, the second recirculated flue gas nozzle above the incineration grate can ensure the stable combustion of the material layer by setting the nozzle angle, the flow velocity and the like.
In some embodiments, the second recirculated flue gas nozzle 170 may be specifically positioned at a rear arch corresponding to the fifth grate segment of the combustion grate 110. Furthermore, the second recirculating flue gas nozzle can be inclined towards the throat area in a larger range, so that the jet flow and the material layer flow in a nearly parallel direction, the second recirculating flue gas nozzle is helpful for being fully mixed with the flue gas in the main combustion area, the oxygen content in the main combustion area is reduced, and the generation amount of fuel type NOx occupying the main body is reduced.
In some embodiments, the second recirculated flue gas nozzle 170 is angled vertically downward or toward the incinerator throat area 150.
It should be noted that the number of the first recirculation flue gas nozzles, the second recirculation flue gas nozzles or the secondary air nozzles can be set according to the requirement, and is not limited herein.
Optionally, the primary air device 120 may include a primary air fan.
Optionally, the overfire air device 130 may include an overfire air fan.
Optionally, the first recirculated flue gas nozzles 140 and the overfire air nozzles 131 are staggered on the front and/or rear wall of the incinerator throat area 150.
Wherein, the secondary air nozzle is positioned on the front wall and the rear wall of the throat area of the incinerator for auxiliary combustion and promoting air flow mixing; the first recirculated flue gas nozzle is arranged near the secondary air nozzle 131 of the front and rear walls and near the outlet of the incinerator, namely, the purified recirculated flue gas enters the incinerator from the vicinity of the secondary air nozzle in the throat area of the incinerator, and the recirculated flue gas is mixed with the combustion flue gas in the throat area, so as to improve the staged combustion effect. Because the secondary air is mainly used for supplementing oxygen and the flow rate is not large, the secondary air can be inserted near the recirculated flue gas and alternately arranged along the width direction of the hearth, so that a better gas mixing effect is achieved.
In some embodiments, the first recirculated flue gas nozzle disposed at the front wall or the rear wall may include one or more rows.
In some embodiments, the overfire air nozzles provided in the front or rear wall may comprise one or more rows.
In some embodiments, the first recirculating flue gas nozzles and the secondary air nozzles arranged in the front wall or the rear wall may be alternately arranged. For example, a preset number of rows or any number of rows of secondary air nozzles may be arranged between the first recirculation flue gas nozzles in each row, or a preset number of rows or any number of rows of first recirculation flue gas nozzles may be arranged between the secondary air nozzles in each row, which is not limited herein.
Optionally, the first recirculating flue gas nozzles and the secondary air nozzles arranged on the front wall and/or the rear wall are in the same height or staggered up and down.
In some embodiments, each row of first recirculated flue gas nozzles and each row of overfire air nozzles disposed on the front or rear wall may be uniform in height or staggered up and down.
In some embodiments, the first distribution sequence of the first recirculated flue gas nozzles and the overfire air nozzles of each row disposed on the front wall may be the same as or different from the second distribution sequence of the first recirculated flue gas nozzles and the overfire air nozzles of each row disposed on the rear wall. For example, if the arrangement on the front wall is, in turn, secondary air, recirculated flue gas, etc., then the arrangement on the back wall is, in turn, recirculated flue gas, secondary air, etc.
In some embodiments, the first distribution order or the second distribution order may comprise:
a preset number of secondary air nozzles are arranged between the first recirculation flue gas nozzles;
and/or the presence of a gas in the gas,
a preset number of first recirculation flue gas nozzles are arranged between the secondary air nozzles.
In some embodiments, the first distribution order or the second distribution order may further comprise:
any number of secondary air nozzles are arranged between the first recirculation flue gas nozzles;
and/or the presence of a gas in the gas,
any number of first recirculation flue gas nozzles are arranged between the secondary air nozzles.
In some embodiments, referring to fig. 2, fig. 2 illustrates an example distribution of recirculated flue gas nozzles and secondary air nozzles according to an embodiment of the present application. The recycling nozzles and the secondary air nozzles can be in the same height and are alternately arranged along the width direction of the hearth, and the recycling nozzles are sequentially secondary air, recycling flue gas, secondary air and recycling flue gas or sequentially recycling flue gas, secondary air, recycling flue gas and secondary air.
That is to say, the distribution setting of first recirculation flue gas nozzle and overgrate air nozzle only need satisfy the two at least partially crisscross setting can, and concrete distribution can set up as required to reach better gas mixing effect. The recirculated flue gas entering the incinerator from the throat area of the incinerator is fully mixed with the combustion flue gas, so that the oxygen content of the main combustion area is reduced, and the generation amount of fuel type NOx occupying the main body is small; the flue gas mixing enhances the airflow disturbance and promotes the full combustion; the high temperature area of the throat area is scattered, the temperature distribution is uniform, and the coking of the hearth can be relieved. Therefore, the number of the openings of the furnace wall is effectively controlled while the operation requirement is met, the field space is saved, and the engineering quantity and the cost are reduced.
Optionally, at least one of the first recirculation flue gas nozzle 140, the second recirculation flue gas nozzle 170 or the overfire air nozzle 131 comprises a straight pipe section and a divergent pipe having a divergence angle comprised between 10 ° and 20 °.
Wherein, the reflux area caused by the jet flow of the gradually expanding pipe is greatly reduced compared with a straight pipe, the smoke sucked to the root part of the jet flow is reduced, the probability that fly ash particles generated by burning move to the root part of the jet flow along with the airflow is reduced, and the coking of a hearth can be slowed down.
Optionally, the garbage incinerator 100 further comprises:
a recirculated flue gas arrangement 180 connected to said first recirculated flue gas nozzle 140 and said second recirculated flue gas nozzle 170 for feeding said recirculated flue gas into said first recirculated flue gas nozzle 140 and said second recirculated flue gas nozzle 170.
Wherein the first recirculated flue gas nozzle and the second recirculated flue gas nozzle can share one recirculated flue gas device to further reduce the cost and the volume. In some embodiments, the recirculated flue gas device 180 may include a recirculation fan.
Optionally, the garbage incinerator 100 further comprises:
a first valve (not shown) located between the first recirculation flue gas nozzle and the recirculation flue gas device for adjusting the flue gas volume of the first recirculation flue gas nozzle;
a second valve (not shown) between the second recirculated flue gas nozzle and the recirculated flue gas device for adjusting the flue gas volume of the second recirculated flue gas nozzle.
The recycling flue gas amount of the first recycling flue gas nozzle and the recycling flue gas amount of the second recycling flue gas nozzle can be adjusted through the first valve and the second valve respectively so as to adapt to different working conditions and guarantee stable and reliable operation of the whole incinerator.
Alternatively, the combustion flue gas discharged from the burner ports 160 through the burner throat region 150 is fed to a flue gas cleaning device (not shown) to obtain the recirculated flue gas.
Optionally, the garbage incinerator 100 further comprises:
and the feeding hole 191 is positioned at the inlet of the incineration grate 110 and is used for feeding garbage onto the incineration grate.
Optionally, the garbage incinerator 100 further comprises:
a slag outlet 192 at the end of the incineration grate 110 for discharging the slag generated by the incineration.
According to the garbage incinerator provided by the embodiment of the application, garbage on the incineration grate absorbs high-temperature flue gas radiation in the incinerator, and is sequentially dried, combusted and burnt out under the action of primary air fed below the incineration grate, and material slag is discharged from a slag outlet at the tail end of the grate; high-temperature combustion flue gas generated by incineration is discharged from an incinerator outlet through an incinerator throat area and is led to a waste heat boiler, a flue gas purification device and the like for purification, and purified flue gas is obtained. Feeding the purified flue gas in a proper proportion into an incinerator as recycled flue gas for recycling, wherein one part of the recycled flue gas can be fed into the incinerator from a second recycled flue gas nozzle at a rear arch above an incinerator grate, and the recycled flue gas is mixed with combustion flue gas above a material layer; the other part is fed into the incinerator from the vicinity of the secondary air nozzle in the throat area of the incinerator, and the recycled flue gas is mixed with the combustion flue gas in the throat area of the incinerator. The recirculated flue gas forms two paths of recirculated flue gas from two positions and enters the incinerator, so that low-nitrogen combustion in the main combustion area is better realized.
The two paths of recirculated flue gas can share one recirculation device, and the amount of each path of recirculated flue gas is adjusted through respective valves. Under the general condition, the secondary air is in small flow or stops running, the oxygen content in the incinerator is reduced to realize low-nitrogen combustion, when the combustion state in the incinerator becomes unstable and CO is rapidly increased, the secondary air is started to supplement air in the incinerator in time, the oxygen content is adjusted, and the incinerator is quitted after being stabilized. Because the low-temperature and low-oxygen recirculated flue gas is introduced from the upper part of the incineration grate and the front and rear walls of the throat area and is fully mixed with the flue gas of the main combustion area, low-oxygen environment atmosphere is created at the lower part and the upper part of the hearth, the generation amount of fuel type NOx occupying the main body is greatly reduced, and the deep removal of the NOx in the furnace is realized. The cooperation setting of burning furnace throat district recirculated flue gas and overgrate air can effective control stove wall trompil quantity, practices thrift space and cost, reaches the air current intensive mixing, can in time make up oxygen when realizing reducing the NOx pollutant, ensures the CO value. The air distribution of each level is independently controlled and matched with each other. The air distribution at each level in the incinerator produces enough disturbance, so that sufficient combustion can be promoted, a high-temperature area of a combustion area is scattered, the temperature distribution is uniform, and coking of a hearth can be relieved.
According to the waste incinerator of this application embodiment, through the crisscross setting of the nozzle with recirculation flue gas and overgrate air, practice thrift space and cost, reach the air current intensive mixing, can in time the oxygenating when realizing reducing the NOx pollutant, and NOx pollutant formation volume is low, reliable and stable operation, convenient effective regulation and control, and fundamentally improves and burns the burning furnace performance, reduces the denitration pressure behind the stove.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The above description is only for the specific embodiments of the present application or the description thereof, and the protection scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope disclosed in the present application, and shall be covered by the protection scope of the present application. The protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A low NOx pollutant waste incinerator, characterized in that said waste incinerator comprises:
the incinerator grate is used for incinerating the garbage positioned on the incinerator grate, and combustion flue gas generated by incineration is discharged from the incinerator mouth through the incinerator throat area;
the primary air device is used for feeding primary air below the incineration grate to provide oxygen for the incineration;
the secondary air device is used for providing secondary air into the incinerator through a secondary air nozzle positioned in the throat area of the incinerator so as to adjust the oxygen amount in the garbage incinerator;
the first recirculated flue gas nozzle and the secondary air nozzle are arranged in a staggered mode and used for sending recirculated flue gas into the furnace to be mixed with the combustion flue gas in the furnace;
and the second recirculated flue gas nozzle is positioned on the rear arch above the incineration grate and used for sending the recirculated flue gas into the combustion area to be mixed with the combustion flue gas so as to reduce the oxygen content in the incinerator.
2. The waste incinerator according to claim 1, wherein said first recirculated flue gas nozzles and said secondary air nozzles are staggered on the front and/or rear wall of the incinerator throat area.
3. The garbage incinerator according to claim 2, wherein said first recirculated flue gas nozzles and said secondary air nozzles provided in the front and/or rear wall are at the same height or staggered up and down.
4. A waste incinerator according to claim 1 wherein the second recirculated flue gas nozzles are inclined vertically downwards or towards the incinerator throat area.
5. The waste incinerator according to claim 1, wherein at least one of said first recirculated flue gas nozzle, said second recirculated flue gas nozzle or said secondary air nozzle comprises a straight pipe section and a divergent pipe, the angle of divergence of said divergent pipe comprising 10 ° -20 °.
6. The waste incinerator according to claim 1, further comprising:
and the recirculating flue gas device is connected with the first recirculating flue gas nozzle and the second recirculating flue gas nozzle and is used for sending the recirculating flue gas into the first recirculating flue gas nozzle and the second recirculating flue gas nozzle.
7. The waste incinerator according to claim 6, further comprising:
a first valve located between the first recirculated flue gas nozzle and the recirculated flue gas device for adjusting the flue gas volume of the first recirculated flue gas nozzle;
and the second valve is positioned between the second recirculation flue gas nozzle and the recirculation flue gas device and is used for adjusting the flue gas volume of the second recirculation flue gas nozzle.
8. The garbage incinerator according to claim 1, wherein said recirculated flue gas is obtained by feeding combustion flue gas discharged from the incinerator throat area to the flue gas purification apparatus.
9. The waste incinerator according to claim 1, further comprising:
and the feeding hole is positioned at the inlet of the incineration grate and used for conveying the garbage to the incineration grate.
10. The waste incinerator according to claim 1, further comprising:
and the slag outlet is positioned at the tail end of the incineration grate and used for discharging the material slag generated by incineration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011191254.8A CN112503535A (en) | 2020-10-30 | 2020-10-30 | Low NOXPollutant garbage incinerator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011191254.8A CN112503535A (en) | 2020-10-30 | 2020-10-30 | Low NOXPollutant garbage incinerator |
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| CN112503535A true CN112503535A (en) | 2021-03-16 |
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| CN202011191254.8A Pending CN112503535A (en) | 2020-10-30 | 2020-10-30 | Low NOXPollutant garbage incinerator |
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