CN112361355A - Burning air supply method for hazardous waste rotary kiln - Google Patents
Burning air supply method for hazardous waste rotary kiln Download PDFInfo
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- CN112361355A CN112361355A CN202011272388.2A CN202011272388A CN112361355A CN 112361355 A CN112361355 A CN 112361355A CN 202011272388 A CN202011272388 A CN 202011272388A CN 112361355 A CN112361355 A CN 112361355A
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- air hole
- head cover
- kiln
- air
- kiln head
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- 239000002920 hazardous waste Substances 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000003111 delayed effect Effects 0.000 claims description 6
- 238000004056 waste incineration Methods 0.000 abstract description 21
- 238000004088 simulation Methods 0.000 abstract description 13
- 238000002485 combustion reaction Methods 0.000 abstract description 4
- 238000004364 calculation method Methods 0.000 description 11
- 230000009467 reduction Effects 0.000 description 10
- 239000002699 waste material Substances 0.000 description 5
- 230000003014 reinforcing effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 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
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
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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
- F23G5/20—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having rotating or oscillating drums
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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
- F23G5/44—Details; Accessories
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2203/00—Furnace arrangements
- F23G2203/20—Rotary drum furnace
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Incineration Of Waste (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
The invention relates to the technical field of hazardous waste incineration, and particularly discloses an incineration air supply method of a hazardous waste rotary kiln, which is realized by adopting an improved air supply structure, wherein the air supply structure comprises a support frame, a rotary drum and a kiln head cover, the kiln head cover is cylindrical, the side wall of the kiln head cover is provided with a main air hole and an auxiliary air hole, the main air hole is positioned at the top of the kiln head cover, the main air hole and the auxiliary air hole are not positioned on the same circumferential line of the kiln head cover, the main air hole is arranged close to the rotary drum, and the auxiliary air hole is arranged at one side far away from the; when the temperature in the rotary drum rises to a preset value, air is supplied into the kiln hood from the main air hole and the auxiliary air hole, and the air speeds of the main air hole and the auxiliary air hole are consistent. Model simulation is passed through to this patent, and the air surplus coefficient control that burns useless the danger comes the air regulation's between 0.8 ~ 1.0 supply volume, calculates the rotatory torrent flow field that obtains this scheme, can be so that the useless burning of danger of rotary kiln is burnt the heat and is reduced the rate and be less than 3%, and under the surplus coefficient prerequisite that can guarantee to hang down, it is much lower to guarantee to burn the rate, improves the combustion rate.
Description
Technical Field
The invention relates to the technical field of hazardous waste incineration, in particular to an incineration air supply method for a hazardous waste rotary kiln.
Background
A large amount of domestic garbage, waste and the like are produced every day in China, most of the domestic garbage and waste contain toxic and harmful substances, and if the domestic garbage and waste is randomly discharged, the environment is polluted. Therefore, the hazardous waste is disposed of before being discharged. At present, the rotary kiln is mainly used for burning the dangerous waste, wherein the thermal ignition loss rate of the ash slag after the dangerous waste is burned is the most powerful basis for judging whether the rotary kiln is normal or not, and the burning completion condition can be calculated.
Generally, if air introduced into the rotary kiln cannot be sufficiently diffused, a formed flow field is not completely covered, the moving speed along the axis of the rotary kiln is too high, and the like, the thermal ignition loss rate is improved, that is, the complete combustion of hazardous wastes cannot be ensured, but the conventional method at present is to improve the air supply amount, but the air excess coefficient of the rotary kiln is too high, so that a large amount of heat is lost, for example, in the current common process, a wind hole is formed in the top of a kiln head cover, and air is supplied, and in order to ensure that the thermal ignition loss rate is within the range of 5% -8%, the air excess coefficient of the rotary kiln reaches 1.5-2.0, so that the important research subject of the hazardous waste incineration rotary kiln needs to ensure both the low thermal ignition loss rate and the low air excess coefficient at present.
Disclosure of Invention
The invention provides an incineration air supply method for a hazardous waste rotary kiln, which not only ensures the low heat ignition loss rate of the rotary kiln, but also ensures the low excess air system of the rotary kiln and reduces the heat loss.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the incineration air supply method of the hazardous waste rotary kiln is realized by adopting an improved air supply structure, wherein the air supply structure comprises a support frame, a rotary drum and a kiln head cover, the kiln head cover is cylindrical, a main air hole and an auxiliary air hole are formed in the side wall of the kiln head cover, the main air hole is positioned at the top of the kiln head cover, the main air hole and the auxiliary air hole are not positioned on the same circumferential line of the kiln head cover, the main air hole is arranged close to the rotary drum, and the auxiliary air hole is arranged far away from one side of the rotary drum; when the temperature in the rotary drum rises to a preset value, air is supplied into the kiln hood from the main air hole and the auxiliary air hole, and the air speeds of the main air hole and the auxiliary air hole are consistent.
The technical principle and the effect of the technical scheme are as follows:
1. in the scheme, because the outer wall of the kiln head cover is cylindrical, air entering from the main air hole and the auxiliary air hole spirally advances along the inner wall of the rotary drum, and a stable rotary turbulent flow field is formed in the rotary drum; in addition, through model simulation, the air excess coefficient of dangerous waste incineration is controlled to be between 0.8 and 1.0 to adjust the air supply amount, the dangerous waste incineration heat ignition reduction rate of the rotary kiln can be lower than 3% through the rotating turbulent flow field obtained by the scheme, and therefore the scheme can guarantee the lower heat ignition reduction rate and improve the combustion rate on the premise of guaranteeing the low excess coefficient.
2. The principle of the scheme that the low heat ignition reduction rate of the rotary kiln can be ensured, the low air excess system of the rotary kiln is also ensured, and the heat loss is reduced is that the fed air advances spirally in the rotary drum, and the rotary flow field formed by entering from the main air hole is found through calculation of a power field model, and the strength of the flow field between adjacent spirals is relatively weak, so that the inventor carries out research and design according to the principle, and the auxiliary air hole is arranged on the kiln head cover to reinforce the rotary flow field of the main air hole, so that the radial uniformity of the flow field in the rotary drum is improved.
Further, the air is supplied from the sub-vents at the same time as compared to the main vents.
Has the advantages that: through simulation calculation, the simultaneous supply can ensure the reinforcing effect of the secondary air hole spiral airflow.
Further, the time for supplying air from the auxiliary air hole is delayed compared with the main air hole, and the time for delaying the supply is not more than 5 min.
Has the advantages that: by means of simulation calculations, the delayed feeding does not affect the reinforcing effect of the secondary port helical air flow.
Furthermore, the vertical distance between the main air hole and the auxiliary air hole is D, the aperture of the main air hole is D, and D is not less than D and is less than 2D.
Has the advantages that: through simulation calculation, when the vertical distance D is smaller than the aperture D of the main air hole or exceeds twice the aperture D, the burning rate of the dangerous waste incineration heat of the rotary kiln exceeds 5% when the air excess coefficient of the dangerous waste incineration is controlled to be 0.8-1.0 to control the air supply amount, and therefore, the reinforcing effect of the spiral air flow formed by the auxiliary air hole is poor outside the range.
Further, the auxiliary air hole is formed in the top of the kiln head cover.
Has the advantages that: through model simulation calculation, the air excess coefficient of the dangerous waste incineration is controlled to be 0.8-1.0 to control the air supply amount, and the burning reduction rate of the dangerous waste incineration heat of the rotary kiln is lower than 3%.
Further, the auxiliary air hole is formed in the middle of the kiln head cover.
Has the advantages that: through model simulation calculation, the air excess coefficient of the dangerous waste incineration is controlled to be 0.8-1.0 to control the air supply amount, and the burning reduction rate of the dangerous waste incineration heat of the rotary kiln is lower than 3%.
Further, the auxiliary air hole is formed in the bottom of the kiln head cover.
Has the advantages that: through model simulation calculation, the air excess coefficient of the dangerous waste incineration is controlled to be 0.8-1.0 to control the air supply amount, and the burning reduction rate of the dangerous waste incineration heat of the rotary kiln is lower than 3%.
Furthermore, a flow guide sleeve is fixed in the kiln head cover, the flow guide sleeve and the outer wall of the kiln head cover are coaxially arranged, and the auxiliary air hole is located on the flow guide sleeve along the radial projection of the outer wall.
Has the advantages that: the air entering from the auxiliary air hole is arranged, so that spiral air flow can be better formed under the action of the flow guide sleeve, and the air flow discharged from the main air hole is better reinforced.
Drawings
FIG. 1 is a schematic structural diagram of an air supply structure in an embodiment 1 of a hazardous waste rotary kiln incineration air supply method of the present invention;
fig. 2 is a schematic structural view of an air supply structure in embodiment 3 of the present invention;
fig. 3 is a schematic structural view of a wind supply structure in embodiment 4 of the present invention;
fig. 4 is a schematic structural view of an air supply structure in embodiment 5 of the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the kiln head comprises a support frame 10, a rotary drum 11, a kiln head cover 12, a main air hole 13, an auxiliary air hole 14 and a flow guide sleeve 15.
Example 1:
the incineration air supply method of the hazardous waste rotary kiln is realized by adopting an improved air supply structure, wherein the improved air supply structure is combined with a structure shown in figure 1 and comprises a support frame 10, a rotary drum 11 and a kiln head cover 12, wherein the rotary drum 11 is rotatably connected onto the support frame 10, the kiln head cover 12 is fixed on the support frame 10, the rotary drum 11 is rotatably and hermetically connected with the kiln head cover 12, the rotary drum 11 is obliquely arranged, and one end of the rotary drum 11, which is close to the kiln head cover 12, is higher than the other end of the rotary drum.
The kiln head cover 12 comprises a cylindrical outer wall and end covers connected to two ends of the outer wall, a main air hole 13 and an auxiliary air hole 14 are arranged on the outer wall of the kiln head cover 12, wherein the main air hole 13 is located at the top of the outer wall, the main air hole 13 and the auxiliary air hole 14 are circular holes, the aperture of the main air hole 13 is larger than that of the auxiliary air hole 14, the main air hole 13 and the auxiliary air hole 14 are arranged in a staggered mode, namely, the main air hole 13 and the auxiliary air hole 14 are not located on the same circumferential line of the kiln head cover 12, the main air hole 13 is close to the rotary drum 11, the auxiliary air hole 14 is far away from one side of the rotary drum 11, the aperture of the main air hole 13 is set to be D, the vertical distance between the main air hole 13 and the auxiliary air hole 14 is D, D is not more than or less than 2D, the linear distance between the main air hole 13 and the auxiliary air hole 14 is L, D is D in the embodiment.
The specific air supply method is that after the temperature in the rotary drum 11 rises to a preset value, air is simultaneously supplied into the kiln head cover 12 from the main air hole 13 and the auxiliary air hole 14, the air speed of the two air holes is consistent, and the outer wall of the kiln head cover 12 is cylindrical, so that the air entering from the main air hole 13 and the auxiliary air hole 14 spirally advances along the inner wall of the rotary drum 11, and a stable rotary turbulent flow field is formed in the rotary drum 11.
Through model simulation, the air excess coefficient that burns dangerously is controlled and is adjusted the air supply volume between 0.8 ~ 1.0, and the rotatory torrent flow field that obtains through the scheme of this embodiment for the dangerously of rotary kiln is burnt hot and is reduced the rate and be less than 3% useless, and it can also guarantee to hang down much hot and reduce the rate, improves the combustion rate under the scheme of this embodiment can guarantee the surplus coefficient prerequisite of low.
Example 2:
the difference from embodiment 1 is that D ═ 1.5D in this embodiment; through model simulation calculation, a conclusion similar to that in example 1 is obtained, namely the air excess coefficient of the dangerous waste incineration is controlled to be 0.8-1.0 to control the air feeding amount, and the burning reduction rate of the dangerous waste incineration of the rotary kiln is lower than 3%.
Example 3:
referring to fig. 2, the difference from embodiment 1 is that the auxiliary air hole 14 is located at the middle of the outer wall in this embodiment; through model simulation calculation, a conclusion similar to that in example 1 is obtained, namely the air excess coefficient of the dangerous waste incineration is controlled to be 0.8-1.0 to control the air feeding amount, and the burning reduction rate of the dangerous waste incineration of the rotary kiln is lower than 3%.
Example 4:
referring to fig. 3, the difference from embodiment 1 is that the secondary air hole 14 is located at the bottom of the outer wall in this embodiment; through model simulation calculation, a conclusion similar to that in example 1 is obtained, namely the air excess coefficient of the dangerous waste incineration is controlled to be 0.8-1.0 to control the air feeding amount, and the burning reduction rate of the dangerous waste incineration of the rotary kiln is lower than 3%.
Example 5:
referring to fig. 4, the difference from embodiment 1 is that in this embodiment, a flow guide sleeve 15 is fixed in the kiln head cover 12, wherein the flow guide sleeve 15 is coaxially arranged with the outer wall of the kiln head cover 12, and the secondary air holes 14 are located on the flow guide sleeve 15 along the radial projection of the outer wall, so that the air entering from the secondary air holes 14 is arranged, and under the action of the flow guide sleeve 15, a spiral air flow can be better formed, and the air flow discharged from the primary air holes 13 can be better reinforced.
Example 6:
the difference from the embodiment 1 is that the time for supplying air from the auxiliary wind hole 14 is delayed compared with the main wind hole 13 in the embodiment, and the time for delayed supply is 5 min; through model simulation calculation, a conclusion similar to that in the embodiment 1 is obtained, namely the air excess coefficient of the dangerous waste incineration is controlled to be 0.8-1.0 to control the air supply amount, and the burning reduction rate of the dangerous waste incineration of the rotary kiln is lower than 3%; it can be seen that delaying the supply for a certain period of time does not affect the reinforcement of the air flow in the secondary air holes 14.
The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (8)
1. The burning air supply method of the hazardous waste rotary kiln is realized by adopting an improved air supply structure, and the air supply structure comprises a support frame, a rotary drum and a kiln head cover, and is characterized in that: the kiln head cover is cylindrical, a main air hole and an auxiliary air hole are formed in the side wall of the kiln head cover, the main air hole is located at the top of the kiln head cover, the main air hole and the auxiliary air hole are not located on the same circumferential line of the kiln head cover, the main air hole is close to the rotary drum, and the auxiliary air hole is far away from one side of the rotary drum; when the temperature in the rotary drum rises to a preset value, air is supplied into the kiln hood from the main air hole and the auxiliary air hole, and the air speeds of the main air hole and the auxiliary air hole are consistent.
2. The hazardous waste rotary kiln incineration air supply method as claimed in claim 1, characterized in that: the air is supplied from the sub-vents at the same time as compared to the main vents.
3. The hazardous waste rotary kiln incineration air supply method as claimed in claim 1, characterized in that: the time for supplying air from the auxiliary air hole is delayed compared with the main air hole, and the delayed supply time is not more than 5 min.
4. The hazardous waste rotary kiln incineration air supply method as claimed in claim 1, characterized in that: the vertical distance between the main air hole and the auxiliary air hole is D, the aperture of the main air hole is D, and D is not less than 2D.
5. The hazardous waste rotary kiln incineration air supply method as claimed in claim 1, characterized in that: the auxiliary air hole is positioned at the top of the kiln head cover.
6. The hazardous waste rotary kiln incineration air supply method as claimed in claim 1, characterized in that: the auxiliary air hole is positioned in the middle of the kiln head cover.
7. The hazardous waste rotary kiln incineration air supply method as claimed in claim 1, characterized in that: the auxiliary air hole is positioned at the bottom of the kiln head cover.
8. The hazardous waste rotary kiln incineration air supply method as claimed in claim 1, characterized in that: a flow guide sleeve is fixed in the kiln head cover, the flow guide sleeve and the outer wall of the kiln head cover are coaxially arranged, and the auxiliary air hole is located on the flow guide sleeve along the radial projection of the outer wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011272388.2A CN112361355A (en) | 2020-11-13 | 2020-11-13 | Burning air supply method for hazardous waste rotary kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011272388.2A CN112361355A (en) | 2020-11-13 | 2020-11-13 | Burning air supply method for hazardous waste rotary kiln |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112361355A true CN112361355A (en) | 2021-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011272388.2A Pending CN112361355A (en) | 2020-11-13 | 2020-11-13 | Burning air supply method for hazardous waste rotary kiln |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6123012U (en) * | 1984-07-18 | 1986-02-10 | 株式会社日本製鋼所 | wood powder combustion device |
| JPH0882410A (en) * | 1994-09-13 | 1996-03-26 | Takuma Co Ltd | Rotary kiln type incinerator |
| CN208804690U (en) * | 2018-08-08 | 2019-04-30 | 江苏百茂源环保科技有限公司 | Dangerous waste rotary kiln swirl air-distribution device |
| CN109974005A (en) * | 2019-03-15 | 2019-07-05 | 浙江三联环保科技股份有限公司 | A kind of sludge incineration method |
| CN110594757A (en) * | 2019-10-14 | 2019-12-20 | 科领环保股份有限公司 | High-efficiency hazardous waste incinerator capable of preventing material returning and method for preventing material returning |
| CN210426041U (en) * | 2019-05-10 | 2020-04-28 | 江苏奥立环保科技有限公司 | Kiln head of hazardous waste incineration rotary kiln |
-
2020
- 2020-11-13 CN CN202011272388.2A patent/CN112361355A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6123012U (en) * | 1984-07-18 | 1986-02-10 | 株式会社日本製鋼所 | wood powder combustion device |
| JPH0882410A (en) * | 1994-09-13 | 1996-03-26 | Takuma Co Ltd | Rotary kiln type incinerator |
| CN208804690U (en) * | 2018-08-08 | 2019-04-30 | 江苏百茂源环保科技有限公司 | Dangerous waste rotary kiln swirl air-distribution device |
| CN109974005A (en) * | 2019-03-15 | 2019-07-05 | 浙江三联环保科技股份有限公司 | A kind of sludge incineration method |
| CN210426041U (en) * | 2019-05-10 | 2020-04-28 | 江苏奥立环保科技有限公司 | Kiln head of hazardous waste incineration rotary kiln |
| CN110594757A (en) * | 2019-10-14 | 2019-12-20 | 科领环保股份有限公司 | High-efficiency hazardous waste incinerator capable of preventing material returning and method for preventing material returning |
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Application publication date: 20210212 |