CN112066390A - Air pipe arrangement of secondary air of large garbage incinerator - Google Patents
Air pipe arrangement of secondary air of large garbage incinerator Download PDFInfo
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- CN112066390A CN112066390A CN202010824212.7A CN202010824212A CN112066390A CN 112066390 A CN112066390 A CN 112066390A CN 202010824212 A CN202010824212 A CN 202010824212A CN 112066390 A CN112066390 A CN 112066390A
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
- F23L9/02—Passages or apertures for delivering secondary air for completing combustion of fuel by discharging the air above the fire
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
Abstract
The invention relates to an air duct arrangement of secondary air of a large garbage incinerator, which is used for secondary air supply of a garbage incinerator wall and discloses that air ducts are arranged on a front wall, a rear wall, a front arch and a rear arch, a spray pipe is arranged on each air duct and penetrates through the front wall, the rear wall, the front arch of the front wall and the rear arch of the rear wall to enable a nozzle to protrude in the wall, the front wall and the rear wall are divided into a front section and a rear section, the front section spray pipe of the front wall is sprayed forwards, the rear section is sprayed backwards, the front section spray pipe and the rear section spray pipe are symmetrically arranged, the direction of the front section spray pipe and the direction of the rear section spray pipe of the rear wall are opposite to that of the front wall, so that the space between the front wall and the rear wall forms front air flow and rear air flow with opposite rotating directions, the front arch and the rear arch are provided with spray pipes, the pipe diameter and the wind speed of the spray pipes on the front arch are larger than those of the spray pipes on the rear arch, and the included angle of the spray pipes on the front arch is smaller than that of the spray pipes on the rear arch, so that rotating airflow is formed in the space between the front arch and the rear arch. The invention has the advantages of improving the combustion performance of the incinerator, improving the corrosion resistance of the water-cooled wall and reducing the emission of pollutants.
Description
Technical Field
The invention relates to an air pipe arrangement of secondary air of a large garbage incinerator, which is used for incineration treatment of urban domestic garbage.
Background
With the rapid development of economy and the improvement of material level in China, the 'refuse-enclosed city' is a difficult problem in most domestic cities, and if the refuse-enclosed city is not effectively disposed, the environment can be seriously polluted. The characteristics of reduction, resource utilization and harmlessness of the waste incineration power generation become the mainstream choice of the current urban waste treatment, wherein the mechanical grate furnace is the furnace type with the largest application range and more mature technology in the field of waste incineration. The incinerator has the characteristics of complete technology, large capacity, strong adaptability and the like, and is more suitable for the characteristics of low heat value and high moisture of Chinese garbage. The reasonable design and the optimized secondary air arrangement have important significance for improving the combustion performance of the incinerator, the corrosion resistance of the water-cooled wall and reducing the emission of pollutants.
Disclosure of Invention
The invention aims to provide air pipe arrangement of secondary air of a large garbage incinerator, which is characterized in that the air distribution mode of the large garbage incinerator is numerically simulated, the flow field and temperature field characteristics of the large garbage incinerator are analyzed, and the number, the row number, the speed, the position, the angle and the like of the secondary air pipes are reasonably designed, so that the effects of better combustion effect, stronger high-temperature corrosion resistance, lower pollutant emission and the like in the incinerator are achieved.
The technical scheme of the invention is based on a front wall, a rear wall, air pipes and spray pipes, and is characterized in that secondary air pipes are respectively and independently arranged on the front wall, the rear wall, a front arch of the front wall and a rear arch of the rear wall, the spray pipes are arranged on the secondary air pipes and penetrate through the front wall, the rear wall, the front arch of the front wall and the rear arch of the rear wall to enable spray nozzles to protrude in the wall, the front wall and the rear wall are respectively provided with an upper row of spray pipes and a lower row of spray pipes with the pipe diameters equal to the spray air speed, and the front-back distance between every two adjacent spray pipes is 1000 mm; the front wall and the rear wall are divided into a front section and a rear section, and on the front sections of the front wall and the rear wall, the spray pipes penetrating through the front wall are sprayed forwards in a forward tilting mode, and the spray pipes penetrating through the rear wall are sprayed backwards in a backward tilting mode; the jet pipe penetrating through the front wall is inclined backwards to jet on the rear sections of the front wall and the rear wall, the jet pipe penetrating through the rear wall is inclined forwards to jet, so that rotary airflow is formed in the front section space of the front wall and the front section space of the rear wall, rotary airflow in the direction opposite to the rotary direction of the front section rotary airflow is formed in the rear section space of the front wall and the rear wall, a row of jet pipes are respectively arranged on a front arch of the front wall and a rear arch of the rear wall, the pipe diameter and the jet air speed of the jet pipes on the front arch are larger than those of the jet pipes on the rear arch, and the included angle formed between the jet pipes on the front arch and a vertical line is smaller than that formed between the jet pipes on the rear arch and the vertical line, so that rotary.
The pipe diameter of the spray pipes on the front wall and the rear wall is 114mm, the spray air speed is 60-80 m/s, the pipe diameter of the spray pipes on the front arch is 89mm, the spray air speed is 35-55 m/s, the pipe diameter of the spray pipes on the rear arch is 76mm, and the spray air speed is 20-37 m/s.
The acute angle formed between the front arch upper nozzle and the vertical line is 51 degrees, and the acute angle formed between the rear arch upper nozzle and the vertical line is 65 degrees.
The positions of the two rows of spray pipes on the front wall, the rear wall and the lower row of spray pipes are longitudinally staggered, the number of the spray pipes in each row is even, the number of the spray pipes on the front section and the rear section of the front wall and the rear wall is half of the total number of the spray pipes, the inclination angles of the spray pipes on the front wall and the rear wall are 43-82 degrees, the inclination angles of the spray pipes on the front section and the rear section of the front wall are sequentially from large to small, the inclination degree is gradually decreased to 5-10 degrees, the inclination angles of the spray pipes on the front section of the front wall and the front section of the rear wall are sequentially from small to large, the inclination degrees are gradually increased to 5-10 degrees, the inclination angles of the spray pipes on the diagonal lines on the front section of the front wall and the rear section of the rear wall are the same, the inclination directions are opposite, and the.
The number of the jet pipes in each row on the front wall is six, twelve jet pipes are arranged in the upper row and the lower row, and the inclination angles of the front section and the rear section of the front wall from the outside to the inside of the six jet pipes are 82 degrees, 72 degrees, 63 degrees, 55 degrees, 48 degrees and 43 degrees respectively.
The working principle of the invention is that the secondary air pipeline arrangement scheme with good combustion effect is obtained by analyzing the combustion conditions of the incinerator under different working conditions.
1. The front wall and the rear wall are provided with the secondary air pipes for opposite flushing, so that a double tangent circle shape can be well formed at the section, disturbance is enhanced, the capability of mixing with oxygen is improved, and the full combustion of volatile components is promoted. In addition, the secondary air pipes of the front wall and the rear wall are arranged in a double-layer mode, the integrity of the circle of contact can be improved, high-temperature flue gas can be concentrated in the center of a flue, the water-cooled wall is well protected, and the phenomenon that the high-temperature wall is attached to the wall is avoided.
2. The angles of the front and rear arch secondary air spray pipes are respectively arranged to be 51 degrees and 65 degrees, a relatively complete vortex can be formed in the hearth, the backflow of high-temperature flue gas in the hearth is enhanced, the mixture of volatile matters and oxygen is more uniform, the residence time is prolonged, the full combustion of garbage is more facilitated, and the generation amount of NOx is reduced.
3. The front wall and the rear wall are respectively provided with 12 secondary air pipes for opposite flushing, so that reasonable air speed of the secondary air pipes is ensured, the circle cutting shape is better, the flue gas is uniformly mixed, and the garbage can be more favorably combusted. If the number of the pipes is increased, the wind speed is reduced, the mixing of the smoke is weakened, and the burning-out of the garbage is not facilitated. If the number of pipes is reduced, the wind speed is increased, so that the residence time of the flue gas in the hearth is not prolonged, and the SNCR denitration effect is influenced to a certain extent.
The garbage is dried from the inlet of the first-stage grate to the middle of the second stage by the radiation heat exchange with the front and rear arches and the flue gas and the heating of primary air at the bottom. From the middle part of the second-stage grate, the drying stage of the garbage is basically completed, and the volatile matter is separated out. The main components of the volatile components are hydrocarbon, CO2, H2, O2 and the like, and the gases are mixed with primary air penetrating through the garbage bed layer and secondary air of a front arch and a rear arch for combustion, so that a high-temperature combustion area is formed above the second-stage to third-stage grates, and the temperature is about 1200-1500K. The secondary air sprayed from the secondary air ports of the front arch and the rear arch forms strong disturbance in the combustion chamber, and simultaneously forms an obvious vortex backflow area in the front arch and the rear arch under the entrainment effect, so that the combustible gas and the oxygen are mixed more fully, the combustion condition is improved, and the retention time of the flue gas in the hearth is prolonged. The flue gas makes spiral rising movement around the center of the hearth along with the vortex backflow of secondary air of the front arch and the rear arch and the trend of the primary air in the upward direction. Meanwhile, the high-temperature combustion area moves along with the flue gas, and secondary air of the front wall and the rear wall is sprayed to bring new oxygen, so that unburned combustible gas in the flue gas can be combusted secondarily. And then the high-temperature flue gas enters a first flue after being fully combusted.
The invention has the advantages of improving the combustion performance of the incinerator, improving the corrosion resistance of the water-cooled wall and reducing the emission of pollutants.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic top view of the front and rear wall ducts and nozzles of the present invention in FIG. 1;
FIG. 3 is a schematic top view of the front and rear arches of the air duct and nozzle of the present invention in FIG. 1;
FIG. 4 is a side view schematic of the front wall duct and nozzle of the present invention;
FIG. 5 is a side view of the rear wall duct and nozzle of the present invention.
Detailed Description
Referring to fig. 1, 2, 3, 4 and 5, the air ducts 1, 2, 3 and 4 for secondary air of the front wall 5 and the rear wall 6 of the waste incinerator are distributed with jet pipes 9, 10, 11 and 12, which is characterized in that the air ducts 1, 2, 3 and 4 are respectively and independently arranged on the front wall 5, the rear wall 6, the front arch 7 of the front wall and the rear arch 8 of the rear wall, the front arch 7 and the rear arch 8 respectively refer to the turning parts of the respective bottoms of the front wall 5 and the rear wall 6 outwards, the secondary air ducts are provided with jet pipes which penetrate through the front wall, the rear wall, the front arch of the front wall and the rear arch of the rear wall to enable the jet nozzles to protrude in the wall, the front wall 5 and the rear wall 6 are respectively provided with an upper row and a lower row of jet pipes with the same pipe diameter and jet speed, the number and the positions of the jet pipes 9 on the upper layer of the front wall 5 are opposite to the jet pipes 12 on the lower layer of the rear wall 6, the front-back distance between two adjacent spray pipes is 1000 mm; the front wall 5 and the rear wall 6 are divided into a front section and a rear section, and spray pipes penetrating through the front wall are sprayed forwards in a forward tilting mode and sprayed backwards in a backward tilting mode on the front sections of the front wall and the rear wall; on the back section of the front wall 5 and the back wall 6, the spray pipes penetrating through the front wall are sprayed backwards in a backward tilting mode, the spray pipes penetrating through the back wall are sprayed forwards in a forward tilting mode, so that left and right rotating air flows are formed in the front section space of the front wall and the front section space of the back wall, right and left rotating air flows are formed in the back section space of the front wall 5 and the back wall 6, a row of spray pipes are respectively arranged on a front arch of the front wall and a back arch of the back wall, the pipe diameter and the spraying air speed of the spray pipes on the front arch are larger than those of the spray pipes on the back arch, the included angle formed between the spray pipes on the front arch and a vertical line is smaller than that formed between the spray pipes on the back arch and the vertical line, and upper and lower rotating. The pipe diameter of the spray pipes on the front wall and the rear wall is 114mm, the spray air speed is 60-80 m/s, the pipe diameter of the spray pipes on the front arch is 89mm, the spray air speed is 35-55 m/s, the pipe diameter of the spray pipes on the rear arch is 76mm, and the spray air speed is 20-37 m/s.
The acute angle formed between the front arch-shaped upper spray pipe and the vertical line is 51 degrees, and the acute angle formed between the rear arch-shaped upper spray pipe and the vertical line is 65 degrees.
The front wall, the rear wall and the lower two rows of spray pipes are longitudinally staggered, the number of the spray pipes in each row is even, the number of the spray pipes on the front section and the rear section of the front wall and the rear wall is half of the total number of the spray pipes, the inclination angles of the spray pipes on the front wall and the rear wall are 43-82 degrees, the inclination angles of the spray pipes on the front section and the rear section of the front wall are sequentially from outside to inside and are gradually decreased, the inclination degree is gradually decreased and is an integer within the range of 5-10 degrees, the inclination angles of the spray pipes on the front section of the front wall and the front section of the rear wall are the same, the inclination directions are opposite, the inclination angles of the spray pipes on the diagonal lines on the rear section of the front wall and the rear section of the rear wall are the same, and the inclination directions are opposite. The number of the jet pipes in each row on the front wall is six, twelve jet pipes are arranged in the upper row and the lower row, and the inclination angles of the front section and the rear section of the front wall from the outside to the inside of the six jet pipes are 82 degrees, 72 degrees, 63 degrees, 55 degrees, 48 degrees and 43 degrees in sequence.
Claims (5)
1. A wind pipe arrangement of secondary air of a large garbage incinerator comprises a front wall and a rear wall of the garbage incinerator, wind pipes and spray pipes, and is characterized in that the front wall, the rear wall, a front arch of the front wall and a rear arch of the rear wall are respectively and independently provided with the secondary wind pipes, the secondary wind pipes are provided with the spray pipes which penetrate through the front wall, the rear wall, the front arch of the front wall and the rear arch of the rear wall to enable nozzles to protrude in the wall, the front wall and the rear wall are respectively provided with an upper row of spray pipes and a lower row of spray pipes with the pipe diameters equal to the spray wind speed, and the distance between the front and the rear of the two adjacent spray pipes is; the front wall and the rear wall are divided into a front section and a rear section, and on the front sections of the front wall and the rear wall, the spray pipes penetrating through the front wall are sprayed forwards in a forward tilting mode, and the spray pipes penetrating through the rear wall are sprayed backwards in a backward tilting mode; the jet pipe penetrating through the front wall is inclined backwards to jet on the rear sections of the front wall and the rear wall, the jet pipe penetrating through the rear wall is inclined forwards to jet, so that rotary airflow is formed in the front section space of the front wall and the front section space of the rear wall, rotary airflow in the direction opposite to the rotary direction of the front section rotary airflow is formed in the rear section space of the front wall and the rear wall, a row of jet pipes are respectively arranged on a front arch of the front wall and a rear arch of the rear wall, the pipe diameter and the jet air speed of the jet pipes on the front arch are larger than those of the jet pipes on the rear arch, and the included angle formed between the jet pipes on the front arch and a vertical line is smaller than that formed between the jet pipes on the rear arch and the vertical line, so that rotary.
2. The air duct arrangement for the secondary air of a large garbage incinerator according to claim 1, wherein said front and rear wall nozzles have a duct diameter of 114mm, a jet air velocity of 60 to 80m/s, a duct diameter of 89mm, a jet air velocity of 35 to 55m/s, a duct diameter of 76mm, and a jet air velocity of 20 to 37 m/s.
3. The air duct arrangement for secondary air of a large garbage incinerator according to claim 1, wherein said front arch upper nozzle is formed with an acute angle of 51 ° with the vertical line, and said rear arch upper nozzle is formed with an acute angle of 65 ° with the vertical line.
4. The air duct arrangement for the secondary air of a large garbage incinerator according to claim 1, wherein the front and rear walls and the lower and upper rows of nozzles are longitudinally staggered, the number of nozzles in each row is even, the number of nozzles in the front and rear walls is half of the total number of nozzles, the inclination angles of the spray pipes of the front wall and the rear wall are 43-82 degrees, the inclination angles of the spray pipes of the front section and the rear section of the front wall are sequentially from outside to inside, the inclination decreasing degree is 5-10 degrees, the inclination angles of the spray pipes of the front section and the rear section of the rear wall are sequentially from outside to inside, the inclination increasing degree is 5-10 degrees, the inclined angles of the diagonal spray pipes on the front section of the front wall and the front section of the rear wall are the same, the inclined directions are opposite, the diagonal spray pipes on the rear sections of the front wall and the rear wall have the same inclination and opposite inclination directions.
5. The air duct arrangement for the secondary air of a large garbage incinerator according to claim 4, wherein the number of the nozzles in each row on the front wall is six, and twelve nozzles are arranged in the upper and lower rows, and the inclination angles of the six nozzles in the front and rear sections of the front wall from outside to inside are 82 °, 72 °, 63 °, 55 °, 48 ° and 43 ° in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010824212.7A CN112066390A (en) | 2020-08-17 | 2020-08-17 | Air pipe arrangement of secondary air of large garbage incinerator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010824212.7A CN112066390A (en) | 2020-08-17 | 2020-08-17 | Air pipe arrangement of secondary air of large garbage incinerator |
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| CN112066390A true CN112066390A (en) | 2020-12-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112503529A (en) * | 2020-12-23 | 2021-03-16 | 光阳通泰环保设备有限公司 | Agricultural solid waste vertical incinerator |
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2020
- 2020-08-17 CN CN202010824212.7A patent/CN112066390A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112503529A (en) * | 2020-12-23 | 2021-03-16 | 光阳通泰环保设备有限公司 | Agricultural solid waste vertical incinerator |
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