CN113574320B - Incinerator with a heat exchanger - Google Patents
Incinerator with a heat exchanger Download PDFInfo
- Publication number
- CN113574320B CN113574320B CN202080021501.1A CN202080021501A CN113574320B CN 113574320 B CN113574320 B CN 113574320B CN 202080021501 A CN202080021501 A CN 202080021501A CN 113574320 B CN113574320 B CN 113574320B
- Authority
- CN
- China
- Prior art keywords
- combustion chamber
- gas
- primary
- supply nozzle
- primary combustion
- 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.)
- Active
Links
- 238000002485 combustion reaction Methods 0.000 claims abstract description 436
- 238000001035 drying Methods 0.000 claims abstract description 57
- 239000007789 gas Substances 0.000 claims description 207
- 239000000567 combustion gas Substances 0.000 claims description 62
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 33
- 239000001301 oxygen Substances 0.000 claims description 33
- 229910052760 oxygen Inorganic materials 0.000 claims description 33
- 238000000034 method Methods 0.000 claims description 11
- 239000007921 spray Substances 0.000 claims description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 31
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 12
- 229910002091 carbon monoxide Inorganic materials 0.000 description 12
- 230000000694 effects Effects 0.000 description 8
- 230000001276 controlling effect Effects 0.000 description 6
- 150000002013 dioxins Chemical class 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/08—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for reducing temperature in combustion chamber, e.g. for protecting walls of combustion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C99/00—Subject-matter not provided for in other groups of this subclass
-
- 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
Abstract
An incinerator is provided with: a primary combustion chamber (12) having a drying section (24), a combustion section (25), and a post-combustion section (26) in this order from the front side toward the rear side; and a secondary combustion chamber (13) which is provided in connection with the outlet side of the primary combustion chamber (12). The primary combustion chamber (12) has a rear supply nozzle (40) for the primary combustion chamber on the rear top wall (23) and/or the rear wall (22). The secondary combustion chamber (13) has a front supply nozzle (44). A rear supply nozzle (40) for a primary combustion chamber guides unburned gas generated in a combustion section (25) to the rear wall (22) side by means of an air flow supplied from the nozzle (40). A front supply nozzle (44) guides unburned gas generated in the drying section (24) to the front side by the gas flow supplied from the nozzle (44) and flows into the secondary combustion chamber (13).
Description
Technical Field
The present invention relates to an incinerator.
Background
JPH05-113208A discloses the following: in the incinerator, a proper amount of secondary air is supplied to the secondary combustion chamber, and EGR gas (Exhaust Gas Recirculation (exhaust gas recirculation) gas) is supplied from the top of the rear side of the primary combustion chamber. Thereby, the secondary air is used to ensure the minimum oxygen amount required for combustion of the unburned gas in the secondary combustion chamber, and the secondary air and the unburned gas are sufficiently stirred by the stirring air flow generated by supplying the EGR gas. This is described in paragraph 0015 of JPH05-113208A, which maintains a high combustion gas temperature and inhibits the formation of carbon monoxide (CO) and dioxins.
JPH07-158827A discloses the following: in the incinerator, a nozzle for supplying air for secondary combustion is provided at the top of the rear side of the primary combustion chamber, and the air for secondary combustion is supplied from the nozzle to the inside of the combustion flame of the waste or to the vicinity of the front end portion thereof. In paragraph 0013 of JPH 07-158827A: the supplied secondary combustion air directly contacts the high-temperature flame, and the oxygen concentration in the inner direction of the flame and in the vicinity of the outer periphery of the flame is increased, so that a large amount of unburned gas such as unburned smoke medium and CO existing in the vicinity of the outer periphery of the flame burns vigorously. And the results are described as follows: the total amount of unburned smoke medium, CO, transferred into the secondary combustion chamber is reduced, black smoke is prevented from being generated, and the CO concentration in the exhaust gas is reduced.
However, in the technique described in JPH05-113208A, JPH-158827 a, a large amount of unburned gas such as unburned smoke medium and CO is burned vigorously in the primary combustion chamber, but the space between the rear combustion grate (rear side) in the primary combustion chamber and the ceiling wall of the combustion chamber in which the rear combustion grate is provided is not sufficiently and effectively utilized. Therefore, the following technical problems exist: the concentration of unburned gas in the primary combustion chamber or the secondary combustion chamber locally increases, and thus Nitrogen Oxides (NO) are generated x )。
To solve this technical problem, JP2014-167353A discloses: the recirculated exhaust gas from the front side is supplied from the top wall of the primary combustion chamber of the incinerator toward the rear, and the recirculated exhaust gas from the rear side is supplied from the rear wall or the rear side top wall of the primary combustion chamber toward the front. In such a configuration, NO can be greatly reduced by dividing the case where the combustion position in the primary combustion chamber is forward of the reference range, the case where the combustion position in the primary combustion chamber is rearward of the reference range, and the case where the combustion position in the primary combustion chamber is within the reference range, and changing the distribution ratio of the recirculated exhaust gas from the front side to the recirculated exhaust gas from the rear side in accordance with each case x Concentration.
Disclosure of Invention
First, the technical problem to be solved
The present invention has an object to further improve the technology described in JP2014-167353A to obtain an incinerator capable of greatly reducing NO by feeding the recirculated exhaust gas from the front side toward the rear from the top wall of the front side in the primary combustion chamber of the incinerator and feeding the recirculated exhaust gas from the rear side toward the front from the rear wall or the rear side top wall in the primary combustion chamber x The concentration technique can exhibit the same NO with a simpler structure than the concentration technique x Reducing the effect.
(II) technical scheme
In order to achieve the above object, an incinerator according to the present invention includes: a primary combustion chamber having a drying section, a combustion section, a post-combustion section in this order from a front side toward a rear side, and having a top wall and a rear wall of the rear side; and a secondary combustion chamber which is provided in connection with the outlet side of the primary combustion chamber and has a secondary combustion gas supply nozzle, wherein in the primary combustion chamber, at least one of the top wall and the rear wall on the rear side has a primary combustion chamber rear supply nozzle which supplies any one of air, EGR gas, a mixed gas of air and EGR gas toward the front side, and in the secondary combustion chamber has a front supply nozzle which supplies a gas flow toward the rear side, wherein the primary combustion chamber rear supply nozzle guides unburned gas generated in the combustion section to the rear wall side by the gas flow supplied from the primary combustion chamber rear supply nozzle, and the front supply nozzle guides unburned gas generated in the drying section to the front side by the gas flow supplied from the front supply nozzle, and flows into the secondary combustion chamber.
According to the present invention, in the incinerator, it is preferable that the secondary combustion gas supply nozzle that supplies the gas flow toward the rear side also serves as the front supply nozzle.
According to the present invention, in the incinerator described above, it is preferable that the plurality of secondary combustion gas supply nozzles are provided in upper and lower stages, and the secondary combustion gas supply nozzle that supplies the gas flow toward the rear side of the lowermost stage also serves as the front supply nozzle.
According to the present invention, in the above-described incinerator, it is preferable that the secondary combustion gas supply nozzle in the lowermost stage, other than the secondary combustion gas supply nozzle, function to adjust the secondary air supply amount.
According to the present invention, it is preferable that the front supply nozzles are arranged so as to intersect with the rear supply nozzles for the primary combustion chamber, so as to avoid interference between the supply gas from the front supply nozzles and the supply gas from the rear supply nozzles for the primary combustion chamber.
According to the present invention, in the incinerator, the primary combustion chamber preferably includes: the primary combustion chamber is connected to the secondary combustion chamber at a rear portion of the front side top wall, and the front side top wall is inclined upward from the front side toward the rear side at an angle exceeding 0 degrees and 60 degrees or less with respect to the horizontal direction.
According to the present invention, in the above-mentioned incinerator, it is preferable that the drying section, the combustion section, and the post-combustion section each have a grate, and the grate is inclined downward at least from the drying section toward the combustion section.
According to the present invention, in the above-described incinerator, it is preferable that the primary combustion chamber rear supply nozzle supplies air to at least the primary combustion chamber, and the incinerator is provided with a control device for controlling the amount of gas supplied from the primary combustion chamber rear supply nozzle to the primary combustion chamber, thereby adjusting the oxygen concentration in the primary combustion chamber.
According to the present invention, in the incinerator described above, it is preferable that the plurality of primary-combustion-chamber rear-portion supply nozzles are provided in upper and lower stages, and the oxygen concentration in the primary combustion chamber is adjusted by fixing the gas supply amount in a part of the primary-combustion-chamber rear-portion supply nozzles and controlling the gas supply amount in the other primary-combustion-chamber rear-portion supply nozzles.
According to the present invention, in the above-described incinerator, it is preferable that the secondary combustion chamber has a front wall for providing the front supply nozzle, and the front wall is located at a position rearward of the rear end of the drying section.
The operation method of an incinerator according to the present invention is an operation method of an incinerator, comprising: a primary combustion chamber having a drying section, a combustion section, a post-combustion section in this order from a front side toward a rear side, and having a top wall and a rear wall of the rear side; and a secondary combustion chamber which is provided in connection with the outlet side of the primary combustion chamber and has a secondary combustion gas supply nozzle, wherein the primary combustion chamber rear supply nozzle is provided on at least one of the rear top wall and the rear wall of the primary combustion chamber, and supplies any one of primary air, EGR gas, and a mixed gas of the primary air and the EGR gas toward the front side, the unburned gas generated in the combustion section is introduced to the rear wall side using the primary combustion chamber rear supply nozzle, and at least the unburned gas generated in the drying section is introduced to the front side using the airflow supplied from the front supply nozzle, and flows into the secondary combustion chamber using the front supply nozzle provided in the secondary combustion chamber and supplying the airflow toward the rear side.
Another incinerator according to the present invention includes: a primary combustion chamber having a drying section, a combustion section, a post-combustion section in this order from a front side toward a rear side, and having a top wall and a rear wall of the rear side; and a secondary combustion chamber which is provided in connection with an outlet side of the primary combustion chamber and has a secondary combustion gas supply nozzle, wherein the primary combustion chamber has a primary combustion chamber rear supply nozzle for supplying any one of primary air, EGR gas, and a mixed gas of the primary air and the EGR gas to a front side, and wherein the secondary combustion chamber has a front supply nozzle for supplying a gas flow to a rear side, the primary combustion chamber comprising: a charging hopper for objects to be burned, a front width part connected from the charging hopper, a front top wall connected from the front width part, a primary combustion chamber connected to a secondary combustion chamber at the rear part of the front top wall,
The top wall of the front side is inclined upward at an angle exceeding 0 degrees and 60 degrees or less with respect to the horizontal direction as it goes from the front side toward the rear side,
the drying section, the combustion section and the post-combustion section are respectively provided with a fire grate, and the fire grate is at least inclined downwards from the drying section to the combustion section.
(III) beneficial effects
According to the present invention, the front supply nozzle can guide the unburned gas generated in the drying section to the front side and flow into the secondary combustion chamber by the gas flow supplied from the front supply nozzle, and thus can contribute to the realization of the same hot NO as in the prior art in which the recirculated exhaust gas is supplied from the top wall of the front side in the primary combustion chamber of the incinerator x Reducing the effect.
Drawings
Fig. 1 is a front view showing the structure of an incinerator according to an embodiment of the present invention.
Fig. 2 is an enlarged cross-sectional view of a main part of the incinerator in a plan view.
Fig. 3 is an enlarged sectional view of the secondary combustion chamber in the incinerator in a plan view.
Detailed Description
The incinerator shown in fig. 1 includes: a garbage supply unit 11, a primary combustion chamber 12, a secondary combustion chamber 13, and an exhaust path 14. In the primary combustion chamber 12 and the secondary combustion chamber 13, combustion of the refuse and combustion of unburned gas mainly composed of carbon and hydrogen generated from the refuse are performed. An exhaust outlet 15 is provided in an upper portion of the primary combustion chamber 12, and the primary combustion chamber 12 and the secondary combustion chamber 13 are communicated with each other by the exhaust outlet 15. The garbage supply unit 11 includes: a charging hopper 16 for receiving garbage, a crane 18 for charging garbage 17 from a garbage pit outside the figure into the charging hopper 16, and a pusher 19 as a garbage feeding device for feeding garbage from the bottom of the charging hopper 16 into the primary combustion chamber 12.
In the illustrated incinerator, the primary combustion chamber 12 is constructed by a plurality of wall portions. Specifically, if the side provided with the input hopper 16 is defined as the front side and the side away from the input hopper 16 is defined as the rear side, the primary combustion chamber 12 has: the front side width portion 20 connected from the input hopper, a front side top wall 21 provided obliquely so as to rise gradually from an upper end of the front side width portion 20 toward the rear side, a rear wall 22 provided on the other side, i.e., the rear side, in the up-down direction, and a rear side top wall 23 provided obliquely so as to rise gradually from an upper end of the rear wall 22 toward the front side. The outlet 15 of the exhaust gas from the primary combustion chamber 12 is provided between the rear portion of the front side top wall 21 and the front portion of the rear side top wall 23.
In the present invention, a nozzle for supplying gas into the primary combustion chamber 12 is not provided in the front ceiling wall 21. The reason is that: since the appropriate amount of the total gas supply amount (also referred to as "flow rate") that can be supplied into the garbage incinerator is determined so that the oxygen concentration of the exhaust gas and the temperature in the furnace are appropriate values, the nozzle that supplies the gas into the primary combustion chamber 12 is not provided in the front ceiling wall 21, and the gas supply amount that can be supplied by other nozzles (particularly the secondary combustion gas supply nozzle 44 and the primary combustion chamber rear supply nozzle 40 described later) provided in the garbage incinerator can be increased. In addition, the method has the advantages of reducing initial cost, saving space and the like.
The inclination angle of the top wall 21 with respect to the horizontal direction is preferably, for example, 15 degrees or more and 40 degrees or less, and more preferably, 15 degrees or more and 30 degrees or less, in such a manner that no nozzle is provided in the top wall 21 of the drying section 24 and that the unburned gas generated in the drying section 24 easily flows toward the front side portion of the primary combustion chamber 12. The front top wall 21 preferably has a length of 1m or more and 5m or less, more preferably 2m or more and 4m or less.
In the rear side ceiling wall 23, as indicated by reference numeral 64 in fig. 1, in the primary combustion chamber 12, in order to introduce unburned gas generated by combustion in the combustion section 25 and the rear combustion section 26 and directed to the secondary combustion chamber 13 to the rear wall 22 side of the primary combustion chamber 12, the inclination angle of the ceiling wall 23 with respect to the horizontal direction is preferably 15 degrees or more and 60 degrees or less, more preferably 15 degrees or more and 35 degrees or less. The length of the rear top wall 23 is preferably 2m or more and 8m or less, more preferably 4m or more and 7m or less.
The primary combustion chamber 12 has a drying section 24, a combustion section 25, and a post-combustion section 26 in this order from the front side to the rear side after the pusher 19. A drying grate 27 is provided at the bottom of the drying section 24, a combustion grate 28 is provided at the bottom of the combustion section 25, and a post-combustion grate 29 is provided at the bottom of the post-combustion section 26 (hereinafter, the drying grate 27, the combustion grate 28, and the post-combustion grate 29 may be simply referred to as "grates"). In the illustrated incinerator, the drying grate 27 and the combustion grate 28 of the respective grates 27, 28, 29 are disposed obliquely downward from the front side toward the rear side, that is, in a direction from the drying section 24 toward the combustion section 25. In the illustrated incinerator, the post-combustion grate 29 is disposed in the horizontal direction. An ash discharge port 30 is provided on the rear side of the post-combustion section 26 to discharge ash generated by burning the refuse 17. In order to facilitate rearward conveyance of the waste 17 in the primary combustion chamber 12, the inclination angle of the drying grate 27, the combustion grate 28, and the post-combustion grate 29 is preferably 0 degrees or more and 20 degrees or less, more preferably 10 degrees or more and 20 degrees or less, with respect to the horizontal direction.
The primary air supply path 31 is a pipe for supplying primary air (combustion air, which may be hereinafter simply referred to as "air") to the primary combustion chamber 12. The primary air supply path 31 branches corresponding to the respective grates 27, 28, 29, and is connected to bellows 32, 33, 34 provided on the lower side of the respective grates 27, 28, 29. Primary air from the primary air supply path 31 is supplied to the inside of the primary combustion chamber 12 through the respective fire grates by a blower (fan).
The primary combustion chamber 12 is provided with a primary combustion chamber rear supply nozzle 40. The primary combustion chamber rear supply nozzle 40 is provided on at least one of the rear side top wall 23 and the rear wall 22. A plurality of the primary combustion chambers 12 are arranged in parallel at predetermined intervals in the width direction of the primary combustion chamber corresponding to the size of the incinerator.
The primary combustion chamber rear supply nozzle 40 is preferably provided in plural stages in the vertical direction and in the same row in the width direction. In addition, when the plurality of primary-combustion-chamber-use rear-portion supply nozzles 40 are provided in the upper and lower stages, it is preferable that the gas supply amount of the primary-combustion-chamber-use rear-portion supply nozzles 40 be fixed in part, and that the gas supply amount of the other primary-combustion-chamber-use rear-portion supply nozzles 40 be controlled so as to control the gas supply amount of the primary-combustion-chamber-use rear-portion supply gas. By using the air flow at a sufficient flow rate supplied from the post-combustion chamber supply nozzle 40 with a fixed gas supply amount in this way, the exhaust gas and the unburned gas generated in the combustion section 25 in particular flow into the upper space 65 in the primary combustion chamber 12 in the post-combustion section 26, and the flow in the primary combustion chamber indicated by reference numeral 64 in fig. 1 can be stably maintained. As a result, the space 65 between the rear combustion grate 29 in the primary combustion chamber 12 and the top wall 23 of the portion of the primary combustion chamber 12 where the rear combustion grate 29 is provided is sufficiently and effectively utilized to burn the unburned gas. For example, the supply amount of the primary combustion chamber rear supply nozzle 40, which has a fixed gas supply amount, varies depending on the diameter of the nozzle, and the flow rate is preferably 35 to 70m/s.
In addition to the above, it is preferable that the supply amount of the oxygen-containing gas can be controlled as described above for the other post-combustion chamber supply nozzles 40. By using the rear supply nozzle 40 for primary combustion chamber capable of controlling the supply amount of the oxygen-containing gas, the oxygen concentration in the primary combustion chamber 12 can be adjusted, and the unburned gas can be effectively burned at an appropriate oxygen concentration in the space 65 of the primary combustion chamber 12 where the rear combustion grate 29 is provided. By effectively burning the unburned gas in the space 65 of the primary combustion chamber 12 at an appropriate oxygen concentration, the generation of CO and dioxins due to incomplete combustion can be suppressed.
In this case, it is particularly preferable to fix the supply amount of the last-stage primary combustion chamber rear-portion supply nozzle 40 and control the supply amount of the other primary combustion chamber rear-portion supply nozzles 40 other than the last stage. By fixing the supply amount of the rear supply nozzle 40 for the primary combustion chamber at the lowermost stage, the exhaust gas and the unburned gas generated in the combustion section 25 in particular can be made to flow into the upper space 65 of the primary combustion chamber 12 in the rear combustion section 26, and the combustion of the unburned gas can be performed by sufficiently and effectively utilizing the upper space 65 of the rear combustion grate 29 in the combustion chamber 12.
In the example of fig. 1, the primary combustion chamber rear supply nozzle 40 is provided in the upper and lower stages on the rear side ceiling wall 23. As shown in fig. 2, two of the primary combustion chamber rear supply nozzles 40 are arranged in parallel in the width direction of the primary combustion chamber 12. That is, 40a is two nozzles on the upper stage side, 40b is two nozzles on the lower stage side, and these are arranged in the same row in the width direction with a predetermined interval. In the illustrated example, the nozzles 40a and 40b of the upper and lower stages are provided at the rear end side of the rear top wall 23 (the top wall 23 in the post-combustion stage 26). In addition, a portion of the primary combustion chamber 12 on the lower stage side thereof, in which a rear supply nozzle 40b for the primary combustion chamber is provided, is shown in cross section in the right side portion of fig. 2, and a portion of the secondary combustion chamber 13, in which a front supply nozzle 44 described later, is provided, is shown in cross section in the left side portion of fig. 2. In order to avoid interference with the air flow of the front supply nozzle 44, it is preferable to stagger (zigzag) the rear supply nozzle 40 and the front supply nozzle 44 for the primary combustion chamber as shown in the figure. In fig. 2, a single-dot chain line 38 indicates the center position in the combustion chambers 12, 13.
Alternatively, instead of the configuration of fig. 2, the number of the primary combustion chamber rear supply nozzles 40 may be arbitrarily changed according to, for example, the width of the primary combustion chamber 12. For example, when the dimension of the primary combustion chamber 12 in the width direction is large, three nozzles 40a on the upper stage side and three nozzles 40b on the lower stage side may be arranged in parallel in the width direction of the primary combustion chamber 12. In this case, the secondary combustion chamber 13 also becomes larger in size correspondingly, and accordingly, the front supply nozzles 44 may be arranged three by three in the width direction of the secondary combustion chamber 13. In this case, the air flow from the rear supply nozzle 40 and the air flow from the front supply nozzle 44 for the primary combustion chamber may be configured so as to collide with each other, unlike the above.
In addition, depending on the shape of the furnace, it is preferable to dispose at least one of the rear supply nozzle 40 and the front supply nozzle 44 for the primary combustion chamber at the center position 38 instead of the configuration of fig. 2.
The gas supply path 41 is a pipe for supplying one of air, EGR gas, and a mixture of air and EGR gas, which are rear supply gases, to the rear supply nozzle 40 for the primary combustion chamber. The rear supply gas is supplied from the gas supply path 41 to the primary combustion chamber 12 via the primary combustion chamber rear supply nozzle 40 by a blower (fan) not shown. By doing so, the exhaust gas and the unburned gas generated in the combustion section 25 in particular can be caused to flow into (swirl around) the upper space 65 of the primary combustion chamber 12 in the post-combustion section 26, and the unburned gas can be burned in the space 65 between the post-combustion grate 29 in the primary combustion chamber 12 and the ceiling wall 23 of the primary combustion chamber 12 in which the post-combustion grate 29 is provided.
The secondary combustion chamber 13 is connected to the outlet 15 of the primary combustion chamber 12 and disposed upward as described above. The secondary combustion chamber 13 is provided with a rectangular cross section, 42 being a front wall of the secondary combustion chamber 13, 43 being a rear wall of the secondary combustion chamber 13. The front top wall 21 is connected to the front wall 42 at a front intersection 63A. The rear top wall 23 is connected to the rear wall 43 at a rear intersection 63B. The front intersecting portion 63A and the rear intersecting portion 63B are preferably at the same height. In addition, regarding the front-side intersecting portion 63A, the rear end of the front-side top wall 21 and the lower end of the front wall 42 are preferably connected to each other in a circular arc shape in cross section. The height of the crossing portion 63A from the grates 27, 28 to the front side is preferably 1.0m to 5.0m, more preferably 2.0m to 4.0m.
As shown in fig. 1 and 3, a post-combustion gas supply nozzle 44 for supplying post-combustion gas to the post-combustion chamber 13 is provided in the front wall 42 and the rear wall 43 of the post-combustion chamber 13. The secondary combustion gas supply nozzles 44 are provided in upper and lower stages, and a plurality of the secondary combustion gas supply nozzles are provided in each stage in parallel in the width direction at predetermined intervals corresponding to the size of the incinerator. In the incinerator shown in fig. 1, the secondary combustion gas supply nozzles 44 of the front wall 42 are provided in upper and lower stages. 44a is a nozzle on the upper stage side, and 44b is a nozzle on the lower stage side. As shown in fig. 3, in each stage, the secondary combustion gas supply nozzles 44 are arranged alternately (zigzag) on the front wall 42 and the rear wall 43 so as to avoid interference with each other.
Fig. 3 shows an example of arrangement of the secondary combustion gas supply nozzles 44 on the front wall 42 and the rear wall 43 of the secondary combustion chamber 13 in the case where two primary combustion chamber rear supply nozzles 40 are provided in the width direction of the primary combustion chamber 12 as shown in fig. 2. As shown in the figure, two secondary combustion gas supply nozzles 44 are provided in the front wall 42, and three secondary combustion gas supply nozzles 44 are provided in the rear wall 43.
In contrast, for example, when the primary combustion chamber 12 has a large width as described above and three primary combustion chamber rear supply nozzles 40 are arranged in parallel in the width direction of the primary combustion chamber 12, the secondary combustion chamber 13 has a large size, and therefore, for example, four secondary combustion gas supply nozzles 44 in the width direction of the secondary combustion chamber 13 may be arranged in parallel in the rear wall 43 of the secondary combustion chamber 13. The number of the secondary combustion gas supply nozzles 44 is not limited to the above example, and may be arbitrarily set according to the size of the furnace, that is, the size of the secondary combustion chamber 13.
The secondary combustion gas supplied from the secondary combustion gas supply nozzle 44 is used to promote combustion of the unburned gas after the portion 61 of the unburned gas from the drying section 24 merges with the portion 64 of the unburned gas after being led from the combustion section 25 to the rear wall 22 side of the primary combustion chamber 12. The secondary combustion gas is any one of secondary air (combustion air), EGR gas, and a mixed gas of secondary air and EGR gas.
The front wall 42 of the secondary combustion chamber 13 is preferably positioned closer to the rear wall 22 of the primary combustion chamber 12 than the rear end of the drying section 24. The reason is that the following control is easy: the unburned gas generated in the drying section 24 is introduced to the front wall 42 side by the airflow supplied from the front supply nozzle 44 described later, and the unburned gas generated in the drying section 24 and the combustion section 25 is introduced to the rear wall 22 side by the airflow supplied from the rear supply nozzle 40 for primary combustion chamber.
A front supply nozzle 44 is provided in the front wall 42 of the secondary combustion chamber 13. The front supply nozzle 44 is provided near the lower end of the front wall 42 of the secondary combustion chamber 13. Specifically, the sheet is preferably placed between 0mm and 2000mm, more preferably between 300mm and 800mm, from the lower end of the front wall 42. In the case where the front supply nozzle is provided in the upper and lower stages, the first stage is preferably disposed between 0mm and 1000mm, more preferably between 500mm and 800mm, from the lower end. The second stage is preferably disposed between 300mm and 2000mm, more preferably between 500mm and 800mm, from the lower end. As described above, a plurality of the secondary combustion chambers 13 are arranged in parallel in the width direction of the front wall 42 in accordance with the size of the incinerator.
The front feed nozzles 44 preferably spray in a horizontal direction or spray downwardly from a horizontal direction. Specifically, the front supply nozzle 44 preferably sprays the gas at an angle of 0 degrees or more and 30 degrees or less from the horizontal direction. The gas supply amount is controlled in such a manner that the flow rate in the front supply nozzle 44 is 20m/s to 60 m/s.
In the incinerator of fig. 1, an example is shown in which the secondary combustion gas supply nozzle 44 that is provided at a position near the lower end in the front wall 42 of the secondary combustion chamber 13 and supplies the gas flow toward the rear side is used as the front supply nozzle 44. That is, a secondary combustion gas supply nozzle 44 serving as a front supply nozzle is provided near the lower end of the front wall 42 of the secondary combustion chamber 13 in the vicinity of the outlet 15, which is a communication port with the primary combustion chamber 12. In the incinerator shown in fig. 1, the secondary combustion gas supply nozzle 44 is provided so as to face the secondary combustion gas supply nozzle 44 serving as a front supply nozzle in the vicinity of the lower end of the rear wall 43 of the secondary combustion chamber 13, and serves to stir the unburned gas in the secondary combustion chamber 13.
In the incinerator shown in fig. 1, a bag filter 45, a blower 46, and a chimney 47 are provided downstream of an exhaust passage 14 connected to the secondary combustion chamber 13. In addition, a cooling tower, an economizer, and the like may be appropriately provided.
The exhaust path 14 is provided with a boiler 48 using exhaust gas as a heat source. The flow meter 49 is used to measure the flow of steam from the boiler 48. The exhaust passage 14 is provided with an oxygen concentration sensor 51 for detecting the oxygen concentration of the exhaust gas passing through the passage 14. The oxygen concentration meter 52 receives a signal from the oxygen concentration sensor 51 to calculate the oxygen concentration. One or more exhaust gas sensors 53 are provided in the stack 47, other exhaust path portions. The exhaust gas sensor 53 is connected to NO x Gauge, SO x An exhaust gas meter 55 such as a CO meter and an oxygen concentration meter.
In fig. 1, 54 is a control device for controlling the combustion state of the illustrated incinerator. A flow meter and a damper are provided in each of the branch paths in the primary air supply path 31, the gas supply path toward the secondary combustion gas supply nozzle 44, and the gas supply path 41 toward the primary combustion chamber rear supply nozzle 40, which will not be described in detail. The control device 54 controls the dampers to have a desired opening degree after receiving signals from the flow meters.
In such a configuration, the primary combustion chamber 12 and the secondary combustion chamber 13 burn the garbage 17 and burn the unburned gas mainly composed of carbon and hydrogen generated from the garbage 17. In particular, in the secondary combustion chamber 13, the unburned gas generated in the primary combustion chamber 12 is burned by the gas containing oxygen from the secondary combustion gas supply nozzle 44. Specifically, the refuse 17 fed from the loading hopper 16 to the primary combustion chamber 12 by the pusher 19 is dried in the drying section 24, and is fed to the combustion section 25 as the next refuse is fed to the drying section 24, and is combusted in the combustion section 25, and then is similarly fed to the post-combustion section 26, and is subjected to post-combustion. As a result, the generated incineration ash is discharged from the discharge port 30 to the outside of the furnace. Since the drying grate 27 and the combustion grate 28 are inclined downward toward the rear, the refuse can be easily transferred to the rear.
Gas is injected toward the rear wall 43 of the secondary combustion chamber 13 from a secondary combustion gas supply nozzle 44, which also serves as a front supply nozzle, provided at the front wall 42 of the secondary combustion chamber 13. Then, with this jet flow, a part 61 of the unburned gas generated in the drying section 24 is not guided to the rear wall 22 side by the air flow supplied from the primary combustion chamber rear-portion supply nozzle 40. Therefore, the part 61 of the unburned gas can be caused to flow into the secondary combustion chamber 13 while the flow of the part 61 of the unburned gas from the drying section 24 can be stably maintained.
In the incinerator shown in fig. 1, it is preferable that the secondary combustion gas supply nozzle 44 has a two-stage structure of the upper stage side nozzle 44a and the lower stage side nozzle 44b as described above, so that the flow rate from the lower stage side nozzle 44b is fixed (fixed), the flow rate from the upper stage side nozzle 44a is regulated, and the entire flow rate of the secondary combustion gas supply nozzle 44 is controlled. That is, the purpose of using the lower nozzle 44b is to flow a part 61 of the unburned gas generated in the drying section 24 as the front supply nozzle to the upper space 62 as described above, and to secure the flow rate and flow volume required for combustion in the primary combustion chamber 12. In contrast, the upper nozzle 44a can be used to adjust the oxygen concentration in the secondary combustion chamber 13.
For example, when the quality or quantity of the refuse 17 to be incinerated is changed, the gas supply amount in the nozzle 44a on the upper stage side is adjusted. The adjustment of the gas supply amount can be performed in a damper of a control type, which is not shown, or a manual damper provided in a gas supply path toward the post-combustion gas supply nozzle 44.
By operating the secondary combustion gas supply nozzle 44 serving also as the front supply nozzle as described above, a part 61 of the unburned gas generated in the drying section 24 can be caused to flow into the upper space 62 in the drying section 24 by the gas flow supplied from the front supply nozzle.
The operation of the primary combustion chamber rear supply nozzle 40 will be described below. By injecting the air flow in the horizontal direction from the rear-side supply nozzle 40 for primary combustion toward the front-side width portion 20 side or in the upward horizontal direction in accordance with the inclination of the top wall 23 on the rear side, in the primary combustion chamber 12, unburned gas generated by combustion in the drying section 24, the combustion section 25, and the post-combustion section 26 and directed toward the secondary combustion chamber 13 can be led to the rear wall 22 side of the primary combustion chamber 12 as indicated by reference numeral 64 in fig. 1. In particular, the exhaust gas and the unburned gas generated in the combustion section 25 can thereby be caused to flow (swirl) into the upper space 65 of the primary combustion chamber 12 in the post-combustion section 26, and can be stirred. Therefore, the concentration of the unburned gas in the primary combustion chamber 12 does not locally become excessively high. Further, the unburned gas can be burned in the upper space 65 of the post-combustion section 26 for a certain period of time, and the amount of unburned gas to be sent to the secondary combustion chamber 13 can be reduced or appropriately controlled.
The gas supply amount to the primary combustion chamber rear supply nozzle 40 is preferably determined based on the combustion position on each of the grates 27, 28, 29. For example, when the combustion position is forward, it is preferable to increase the gas supply amount of the primary combustion chamber rear supply nozzle 40. In the case where the combustion position is located at the rear, the gas supply amount of the primary combustion chamber rear supply nozzle 40 may be controlled so as to be reduced. In the case where the combustion position is later, the same control as in the case where the combustion position is within the reference range can be performed. It is preferable that the combustion position is determined based on the combustion start position and/or the burnout position on each of the grates 27, 28, 29, and is checked based on an infrared camera or an industrial camera, not shown.
In the incinerator shown in fig. 1, the primary combustion chamber rear supply nozzle 40 has a two-stage structure including the upper primary combustion chamber rear supply nozzle 40a and the lower primary combustion chamber rear supply nozzle 40 b. In this case, it is preferable that the lower stage side primary combustion chamber rear supply nozzle 40b is used to ensure the flow rate, and the upper stage side primary combustion chamber rear supply nozzle 40a is used to assist in ensuring the required flow rate. The reason is that: if the gas is excessively injected at an ultra-high speed from the rear-portion supply nozzle 40 for one primary combustion chamber, the flow is disturbed by exceeding the maximum amount of the gas that can be injected from the nozzle diameter of the rear-portion supply nozzle 40 for one primary combustion chamber, and the desired guiding effect cannot be exerted, and the gas inside the primary combustion chamber 12 cannot be satisfactorily stirred. Further, by using the lower-stage-side primary-combustion-chamber rear-portion supply nozzle 40b for securing a flow rate for exerting a desired guiding effect, the exhaust gas containing unburned gas can be guided to the rear of the primary combustion chamber 12 and can be burned further rearward than the space 65, as compared with the case where the upper-stage-side primary-combustion-chamber rear-portion supply nozzle 40a is used for securing a flow rate.
The exhaust gas containing unburned gas is easily led to the rear of the primary combustion chamber 12 by the upward inclination angle of the air flow from the primary combustion chamber rear supply nozzle 40. However, if it is too upward, it is attenuated by friction with the top wall 23, and the desired function cannot be exerted. In order to introduce the exhaust gas containing the unburned gas to the rear side without significantly attenuating the exhaust gas, the inclination angle of the air flow from the primary combustion chamber rear-portion supply nozzle 40 is preferably within minus 35 degrees from the inclination angle of the top wall 23, and more preferably within minus 20 degrees from the inclination angle of the top wall 23. The lower limit of the inclination angle of the air flow from the primary combustion chamber rear supply nozzle 40 is preferably 0 degrees, i.e., in the horizontal direction, if the direct influence of the air flow on the flame regions on the respective grates 27, 28, 29 is considered.
As described above, according to the present invention, the gas is injected from the secondary combustion gas supply nozzle 44 provided in the front wall 42 of the secondary combustion chamber 13 toward the rear wall 43 of the secondary combustion chamber 13, whereby the part 61 of the unburned gas generated in the drying section 24 is led to the front side. That is, even if the supply device is not provided, the same operational effects as those of the supply device can be exerted, and the same obvious NO can be obtained x The supply device does not guide a part 61 of the unburned gas to the rear wall side by the air flow supplied from the rear-side supply nozzle 40 for the primary combustion chamber, and flows into the space 62 above the arm drying grate 27, and supplies the recirculated exhaust gas or the like from the front top wall 21 of the primary combustion chamber 12 to the rear.
Further, according to the present invention, the following advantages can be obtained. That is, in the primary combustion chamber 12, compared with JP2014-167353A, since the distance between the drying grate 27 and the combustion grate 28 and the front supply nozzle (the secondary combustion gas supply nozzle 44 also serving as the front supply nozzle) is made close, and the stirring effect by the gas supply nozzle provided in the ceiling of the drying section in the known technology is performed by the gas flow from the front supply nozzle (the secondary combustion gas supply nozzle 44 also serving as the front supply nozzle), and, in particular, since the inclination angle of the ceiling 21 in the drying section 24 is made 60 degrees or less, preferably 30 degrees or less after the primary combustion chamber 12 is made inclinedMore preferably 15 to 25 degrees, it is easy to flow a part of the combustion exhaust gas along the front side portion of the primary combustion chamber 12 even if a nozzle is not provided in the top wall 21 of the drying section 24, and NO can be obtained as in the case where a nozzle is provided in the top wall 21 on the front side as in JP2014-167353A x Reducing the effect. By reducing the number of nozzles provided in the primary combustion chamber 12 without providing the nozzles in the front side ceiling wall 21 in this manner, the total flow rate restriction that can be supplied by other nozzles provided in the primary combustion chamber 12 is alleviated. That is, the amount of gas that can be supplied by other nozzles (in particular, the secondary combustion gas supply nozzle 44 and the primary combustion chamber rear supply nozzle 40 described later) provided in the garbage incinerator can be increased. Thus, the flow rate of the other nozzles provided in the primary combustion chamber 12 can be increased to increase the flow rate, and the exhaust gas can be easily stirred.
In the above, the example in which the secondary combustion gas supply nozzle 44 also serves as the front supply nozzle has been described, but it may be a structure that does not serve as a front supply nozzle.
Further, since the space 65 in the post-combustion section 26, in particular, in the upper portion is larger than the space 62 in the upper portion, the unburned gas can be prevented from remaining for a long period of time, and the unburned gas can be locally accumulated, and the unburned gas can be gradually burned from the space 65 in the upper portion. As a result, since the unburned gas flowing into the secondary combustion chamber 13 through the space 65 is reduced, the combustion temperature does not locally rise even in the secondary combustion chamber 13, and NO generation can be made difficult x Is a multi-stage combustion of (a).
The unburned gas generated in the combustion section 25 and the like is led to the rear wall 22 side by the gas flow supplied from the rear-portion supply nozzle 40 for the primary combustion chamber, and the unburned gas generated in the drying section 24 is led to the front side by the gas flow supplied from the front-portion supply nozzle. That is, the unburned gas generated in the drying section 24 is not guided to the rear wall 22 side by the gas flow supplied from the primary combustion chamber rear supply nozzle 40, and flows into the secondary combustion chamber 13. Further, since the unburned gas in the secondary combustion chamber 13 is merged with the gas, the secondary combustion can be performedThe unburned gas is regulated in the chamber 13, so that the combustion temperature does not locally rise, and NO is hardly generated x 。
Further, since sufficient combustion can be performed in the primary combustion chamber 12, it is possible to suppress the supply amount of oxygen (secondary air) from the secondary combustion gas supply nozzle 44 in the secondary combustion chamber 13 to the minimum necessary, and to ensure sufficient stirring of unburned gas and secondary air. Thus, the amount of oxygen supplied can be suppressed to a minimum, and thus the generation of NO can be suppressed x And also can inhibit the formation of CO and dioxins.
In addition, even in the space 65 of the primary combustion chamber 12, the air is supplied from the primary combustion chamber rear supply nozzle 40, whereby an appropriate oxygen concentration can be maintained. Therefore, the generation of CO and dioxins due to unstable combustion can be suppressed.
On the other hand, there is a problem that combustion is unstable due to a low air ratio in which the oxygen concentration is low. Specifically, if the unburned gas is burned at a low air ratio, there is a technical problem that the combustion is unstable, CO is increased to generate, the flame temperature is locally increased to NO x The amount of soot generated increases sharply, and the amount of harmful substances in exhaust gas increases. In addition, in the garbage incinerator, control is performed to increase or decrease the supply amount of air to be supplied into the primary combustion chamber through the fire grate in accordance with the amount of steam generated in the boiler. In such control, when the garbage quality of garbage charged into the primary combustion chamber 12 increases (for example, the amount of generated heat per unit weight is high) and the amount of generated vapor in the boiler 48 increases, the amount of air supplied through the grates 27, 28, 29 decreases, and therefore the concentration of unburned gas in the exhaust gas flowing from the primary combustion chamber 12 to the secondary combustion chamber 13 increases. In this case, the unburned gas reaching the secondary combustion chamber 13 is burned at once by the air injected from the nozzle 44 disposed in the secondary combustion chamber 13, and a high temperature region is formed in the vicinity of the nozzle 44. As a result, NO in the exhaust gas discharged from the secondary combustion chamber 13 is generated x The concentration is increased.
A method of controlling the supply amount of the post-combustion chamber supply gas in the case where at least one of the air, the EGR gas, and the mixed gas of the air and the EGR gas is supplied from the post-combustion chamber supply nozzle 40 to solve the above-described problems will be described.
First, control of the supply amount of secondary air for combustion from the secondary combustion gas supply nozzle 44 will be described. The supply amount of the secondary air for combustion from the secondary combustion gas supply nozzle 44 is controlled by the control device 54 based on the measurement result of the oxygen concentration meter 52. Specifically, the supply amount of secondary air for combustion is controlled so that the oxygen concentration measured by the oxygen concentration meter 52 is 3 to 5%. By reducing the supply amount of secondary air, the amount of exhaust gas from the incinerator can be reduced.
The control of the supply amount of the primary air supplied through the respective grates 27, 28, 29 will be described. The amount of primary air supplied is controlled by the control device 54 so that the amount of steam from the boiler 48 approaches the target amount of steam. For example, when the amount of steam from the boiler 48 is larger than the target amount of steam, the command value of the waste feeding speed by the pusher 19 is lowered from the current value. In the case where the drying grate 27, the combustion grate 28, and the post-combustion grate 29 are configured to be movable in the front-rear direction and sequentially convey the refuse to the rear side, the feeding speed is controlled so as to be slow. Then, the command value of the primary air supply amount is reduced from the current value.
The control of the supply amount of air from the primary combustion chamber rear supply nozzle 40 will be described. The supply amount of air from the primary combustion chamber rear supply nozzle 40 is an amount necessary for burning the unburned gas generated in the primary combustion chamber 12. Specifically, the amount of air supplied from the post-primary-combustion-chamber supply nozzle 40 is controlled by the control device 54 based on the oxygen concentration measured by the oxygen concentration meter 52 so that the air ratio in the interior of the primary combustion chamber 12 (hereinafter referred to as the "primary combustion chamber air ratio") is a predetermined value (for example, 0.7 to 1.2, preferably 0.95 to 1.10).
The primary combustion chamber air ratio is calculated by the following expression (1).
Air ratio of primary combustion chamber
The ratio of air under the fire grate [ - ] + the ratio of air of the post-combustion top plate [ - ]. Cndot.1 ] is defined in the following formula (2). The post-combustion ceiling air ratio is defined in the following expression (3).
[ formula 1]
[ formula 2]
In the above expression (3), the post-combustion ceiling air flow rate is the flow rate of air contained in the gas injected from the post-combustion supply nozzle 40 for the primary combustion chamber. In the above equations (2) and (3), the total inflow air amount is the sum of the flow rate of the air under the fire grate, the flow rate of the air supplied from the rear side ceiling for the primary combustion chamber, and the flow rate of the secondary air in the secondary combustion chamber 13.
In the post-combustion section 26, that is, in the upper space 65 of the post-combustion grate 29 in the primary combustion chamber 12, it is preferable to control the internal oxygen concentration of the primary combustion chamber 12 when the unburned gas is burned. By controlling the oxygen concentration in the primary combustion chamber 12, the following problems can be improved: unstable combustion, increased CO production, localized rise in flame temperature and NO x The amount of coal produced is drastically increased, and the amount of harmful substances in exhaust gas is increased.
(other means for practicing the invention)
Fig. 1 illustrates a structure in which the primary combustion chamber rear supply nozzle 40 is provided on the rear top wall 23, and may be provided on the rear wall 22.
When the incinerator is large, or when the air flow rate and/or the EGR gas flow rate are insufficient, the flow rate supplied from the nozzle is reduced. In this case, it is desirable to provide a throttle valve or the like in the flow path, i.e., in the outlet 15 of the primary combustion chamber 12 (the inlet of the secondary combustion chamber 13), and to increase the flow rate of the combustion exhaust gas by the ejector effect of the throttle valve to achieve the necessary flow rate.
In the incinerator shown in fig. 1, in the secondary combustion chamber 13, secondary combustion gas supply nozzles 44 are provided in both the front wall 42 and the rear wall 43. In this case, in order to avoid interference between the air flow from the post-combustion air supply nozzle 44 provided in the front wall 42 and the air flow from the post-combustion air supply nozzle 44 provided in the rear wall 43, it is preferable that these post-combustion air supply nozzles 44 are arranged so as to be staggered (zigzag) in plan view. That is, it is preferable that the secondary combustion gas supply nozzle 44 provided in the front wall 42 and the secondary combustion gas supply nozzle 44 provided in the rear wall 43 are provided at separate positions in the direction perpendicular to the paper surface in fig. 1.
In the incinerator, the same operation as the supply of recirculated exhaust gas and the like from the supply device provided in the front side ceiling wall 21 of the primary combustion chamber 12 to the rear is performed by using the gas injected in the horizontal direction from the secondary combustion gas supply nozzle 44 provided in the front wall 42 of the secondary combustion chamber 13 to the rear wall 43 of the secondary combustion chamber 13, and in order to be able to perform this operation, the installation position of the secondary combustion gas supply nozzle 44, in particular, the spatial shape formed by the front side ceiling wall 21 of the primary combustion chamber 12, other structures in the primary combustion chamber 12, and the like can be appropriately set.
Claims (7)
1. An incinerator, comprising:
a primary combustion chamber having a drying section, a combustion section, a post-combustion section in this order from a front side toward a rear side, and having a top wall and a rear wall of the rear side; and
a secondary combustion chamber which is provided in connection with the outlet side of the primary combustion chamber and has a secondary combustion gas supply nozzle,
the primary combustion chamber has a rear supply nozzle for the primary combustion chamber provided on at least one of a top wall and a rear wall on a rear side thereof, and supplies any one of air, EGR gas, and a mixed gas of air and EGR gas toward a front side,
In the secondary combustion chamber there is a front supply nozzle for supplying an air flow towards the rear side,
the primary combustion chamber rear supply nozzle guides unburned gas generated in the combustion section to the rear wall side by the gas flow supplied from the primary combustion chamber rear supply nozzle,
the front supply nozzle guides the unburned gas generated in the drying section to the front side by the gas flow supplied from the front supply nozzle, and flows into the secondary combustion chamber,
the plurality of secondary combustion gas supply nozzles are provided in the upper and lower stages, and the secondary combustion gas supply nozzle of the lowermost stage which supplies the gas flow toward the rear side serves as a front supply nozzle,
the flow rate from the secondary combustion gas supply nozzle at the lowest stage is set to a constant value, and the flow rate from the other secondary combustion gas supply nozzles is adjusted to thereby exert the function of adjusting the secondary air supply amount,
the drying section, the combustion section and the post combustion section are respectively provided with a fire grate which is at least inclined downwards from the drying section to the combustion section,
in the primary combustion chamber, a nozzle for supplying primary combustion gas is not provided in the top wall on the front side.
2. An incinerator, comprising:
a primary combustion chamber having a drying section, a combustion section, a post-combustion section in this order from a front side toward a rear side, and having a top wall and a rear wall of the rear side; and
A secondary combustion chamber which is provided in connection with the outlet side of the primary combustion chamber and has a secondary combustion gas supply nozzle,
the primary combustion chamber has a rear supply nozzle for the primary combustion chamber provided on at least one of a top wall and a rear wall on a rear side thereof, and supplies any one of air, EGR gas, and a mixed gas of air and EGR gas toward a front side,
in the secondary combustion chamber there is a front supply nozzle for supplying an air flow towards the rear side,
the primary combustion chamber rear supply nozzle guides unburned gas generated in the combustion section to the rear wall side by the gas flow supplied from the primary combustion chamber rear supply nozzle,
the front supply nozzle guides the unburned gas generated in the drying section to the front side by the gas flow supplied from the front supply nozzle, and flows into the secondary combustion chamber,
the primary combustion chamber rear supply nozzle supplies air to at least the primary combustion chamber,
the incinerator is provided with a control device for controlling the supply amount of the gas from the rear supply nozzle for the primary combustion chamber to the primary combustion chamber so as to adjust the oxygen concentration in the primary combustion chamber,
the rear supply nozzles for the plurality of primary combustion chambers are arranged in upper and lower sections,
In the plurality of primary-combustion-chamber rear-portion supply nozzles, the oxygen concentration in the primary combustion chamber is adjusted by fixing the gas supply amount in a part of the primary-combustion-chamber rear-portion supply nozzles and controlling the gas supply amount in the other primary-combustion-chamber rear-portion supply nozzles.
3. The incinerator according to claim 1 or 2, characterized in that,
the front supply nozzles are staggered with respect to the rear supply nozzles for the primary combustion chamber so as to avoid interference of the supply gas from the front supply nozzles with the supply gas from the rear supply nozzles for the primary combustion chamber.
4. The incinerator according to claim 1 or 2, characterized in that,
the primary combustion chamber is provided with: a loading hopper, a front width part connected from the loading hopper, a front top wall connected from the front width part,
the primary combustion chamber is connected with the secondary combustion chamber at the rear part of the top wall of the front side,
the front feed nozzle sprays the air flow downward in the horizontal direction or more,
the top wall of the front side is inclined upward at an angle exceeding 0 degrees and 60 degrees or less with respect to the horizontal direction as it goes from the front side toward the rear side.
5. The incinerator according to claim 1 or 2, characterized in that,
The secondary combustion chamber has a front wall for providing a front supply nozzle, the front wall being located further to the rear than the rear end of the drying section.
6. An operation method of an incinerator, the method operating the incinerator, the incinerator comprising:
a primary combustion chamber having a drying section, a combustion section, a post-combustion section in this order from a front side toward a rear side, and having a top wall and a rear wall of the rear side; and
a secondary combustion chamber which is provided in connection with the outlet side of the primary combustion chamber and has a secondary combustion gas supply nozzle, characterized in that,
the primary combustion chamber rear supply nozzle is provided on at least one of a top wall and a rear wall of the primary combustion chamber at a rear side thereof, supplies any one of primary air, EGR gas, and a mixed gas of the primary air and the EGR gas toward a front side, guides unburned gas generated in the combustion section to the rear wall side using the primary combustion chamber rear supply nozzle,
at least unburned gas generated in the drying section is introduced to the front side by the gas flow supplied from the front-side supply nozzle and flows into the secondary combustion chamber,
The plurality of secondary combustion gas supply nozzles are provided in the upper and lower stages, and the secondary combustion gas supply nozzle of the lowermost stage which supplies the gas flow toward the rear side serves as a front supply nozzle,
the flow rate from the secondary combustion gas supply nozzle at the lowest stage is set to a constant value, and the flow rate from the other secondary combustion gas supply nozzles is adjusted to thereby exert the function of adjusting the secondary air supply amount,
the drying section, the combustion section and the post combustion section are respectively provided with a fire grate which is at least inclined downwards from the drying section to the combustion section,
in the primary combustion chamber, a nozzle for supplying primary combustion gas is not provided in the top wall on the front side.
7. An operation method of an incinerator, the method operating the incinerator, the incinerator comprising:
a primary combustion chamber having a drying section, a combustion section, a post-combustion section in this order from a front side toward a rear side, and having a top wall and a rear wall of the rear side; and
a secondary combustion chamber which is provided in connection with the outlet side of the primary combustion chamber and has a secondary combustion gas supply nozzle, characterized in that,
the primary combustion chamber rear supply nozzle is provided on at least one of a top wall and a rear wall of the primary combustion chamber at a rear side thereof, supplies any one of primary air, EGR gas, and a mixed gas of the primary air and the EGR gas toward a front side, guides unburned gas generated in the combustion section to the rear wall side using the primary combustion chamber rear supply nozzle,
At least unburned gas generated in the drying section is introduced to the front side by the gas flow supplied from the front-side supply nozzle and flows into the secondary combustion chamber,
the primary combustion chamber rear supply nozzle supplies air to at least the primary combustion chamber,
the oxygen concentration in the primary combustion chamber is adjusted by controlling the supply amount of the gas from the rear supply nozzle for the primary combustion chamber toward the primary combustion chamber,
the rear supply nozzles for the plurality of primary combustion chambers are arranged in upper and lower sections,
in the plurality of primary-combustion-chamber rear-portion supply nozzles, the oxygen concentration in the primary combustion chamber is adjusted by fixing the gas supply amount in a part of the primary-combustion-chamber rear-portion supply nozzles and controlling the gas supply amount in the other primary-combustion-chamber rear-portion supply nozzles.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-047859 | 2019-03-15 | ||
| JP2019047859 | 2019-03-15 | ||
| PCT/JP2020/010168 WO2020189394A1 (en) | 2019-03-15 | 2020-03-10 | Incinerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113574320A CN113574320A (en) | 2021-10-29 |
| CN113574320B true CN113574320B (en) | 2024-03-08 |
Family
ID=72520334
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080021501.1A Active CN113574320B (en) | 2019-03-15 | 2020-03-10 | Incinerator with a heat exchanger |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN113574320B (en) |
| WO (1) | WO2020189394A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115264505A (en) * | 2022-07-21 | 2022-11-01 | 北京基亚特环保科技有限公司 | Grate furnace device for household garbage incineration |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2180891Y (en) * | 1993-08-02 | 1994-10-26 | 杨景森 | Recombustion type burning furnace |
| DE4429958A1 (en) * | 1994-08-24 | 1996-02-29 | Noell Abfall & Energietech | Grate slag heat treatment process esp. for refuse incineration |
| JP2003172508A (en) * | 2001-12-04 | 2003-06-20 | Minamikawachi Seisou Shisetsu Kumiai | Incinarator |
| CN104334971A (en) * | 2012-03-29 | 2015-02-04 | 日立造船株式会社 | Combustion driving method in incinerator |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2758090B2 (en) * | 1991-10-21 | 1998-05-25 | 株式会社クボタ | CO control method in incinerator |
| DE19648639C2 (en) * | 1996-10-10 | 1998-09-17 | Steinmueller Gmbh L & C | Process for burning fuel on a grate and grate firing to carry out the process |
| JP4236593B2 (en) * | 2004-01-16 | 2009-03-11 | 南河内清掃施設組合 | Waste incinerator |
| JP5219468B2 (en) * | 2007-11-15 | 2013-06-26 | 日立造船株式会社 | Blowing method of secondary combustion air in the secondary combustion chamber |
| JP5084581B2 (en) * | 2008-03-27 | 2012-11-28 | 日立造船株式会社 | Secondary air blowing method in the secondary combustion chamber |
| EP2505919A1 (en) * | 2011-03-29 | 2012-10-03 | Hitachi Zosen Inova AG | Method for optimising the burn-off of exhaust gases of an incinerator assembly by homogenization of the flue gases above the combustion bed by means of flue gas injection |
| CN102980194B (en) * | 2012-11-29 | 2015-09-02 | 华南理工大学 | A kind of low nitrogen of rubbish and Di bioxin fire grate incinerating method and device thereof |
| CN208154485U (en) * | 2018-01-24 | 2018-11-27 | 华西能源工程有限公司 | A kind of Secondary Air optimization system of waste incinerator |
-
2020
- 2020-03-10 CN CN202080021501.1A patent/CN113574320B/en active Active
- 2020-03-10 WO PCT/JP2020/010168 patent/WO2020189394A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2180891Y (en) * | 1993-08-02 | 1994-10-26 | 杨景森 | Recombustion type burning furnace |
| DE4429958A1 (en) * | 1994-08-24 | 1996-02-29 | Noell Abfall & Energietech | Grate slag heat treatment process esp. for refuse incineration |
| JP2003172508A (en) * | 2001-12-04 | 2003-06-20 | Minamikawachi Seisou Shisetsu Kumiai | Incinarator |
| CN104334971A (en) * | 2012-03-29 | 2015-02-04 | 日立造船株式会社 | Combustion driving method in incinerator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113574320A (en) | 2021-10-29 |
| WO2020189394A1 (en) | 2020-09-24 |
| JPWO2020189394A1 (en) | 2020-09-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101484753B (en) | Stoker-type incinerator and method for controlling combustion in the incinerator | |
| CN104791772B (en) | Low-nitrogen combustion stokerfeed boiler with two-stage smoke recirculation function | |
| JP2004205161A (en) | Solid fuel boiler and boiler combustion method | |
| JP5950299B2 (en) | Stoker-type incinerator and combustion method thereof | |
| CN113574320B (en) | Incinerator with a heat exchanger | |
| JPS6323442B2 (en) | ||
| JP5013808B2 (en) | Combustion control device for stoker-type incinerator | |
| WO1988008504A1 (en) | Combustion control method for fluidized bed incinerator | |
| JP6887917B2 (en) | Incinerator plant | |
| CN106838971B (en) | Biomass bundling fuel chain boiler air supply system | |
| CA1290988C (en) | Method of combustion for fluidized bed incinerators | |
| JP7474743B2 (en) | Incinerator | |
| JP7199305B2 (en) | Incinerator and incinerator control method | |
| JP7397627B2 (en) | Incineration plant and its combustion control method | |
| JP3223994B2 (en) | Incinerator and its flame control method | |
| CN112503535A (en) | Low NOXPollutant garbage incinerator | |
| JP2005308272A (en) | Fire grate type waste incinerator | |
| CN205002105U (en) | Low -nitrogen combustion chain furnace with two -stage gas recirculation | |
| JP3866253B2 (en) | Control method of combustion air in waste incinerator | |
| JP7177960B1 (en) | Combustion equipment and control equipment | |
| WO2008029712A1 (en) | Stoker-type incinerator and method for controlling combustion in the incinerator | |
| CN210688192U (en) | Novel biomass combustion hot blast stove | |
| JPH1061929A (en) | Control method for supplying secondary combustion air in combustion device | |
| JP7103781B2 (en) | Fluidized bed furnace | |
| CN114729745A (en) | Mechanical grate furnace |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |