CN203810390U - Over fire air and secondary air regulation device for pulverized coal boiler - Google Patents
Over fire air and secondary air regulation device for pulverized coal boiler Download PDFInfo
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- CN203810390U CN203810390U CN201420220986.9U CN201420220986U CN203810390U CN 203810390 U CN203810390 U CN 203810390U CN 201420220986 U CN201420220986 U CN 201420220986U CN 203810390 U CN203810390 U CN 203810390U
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Abstract
The utility model discloses an over fire air and secondary air regulation device for a pulverized coal boiler and relates to an air quantity regulation device of the pulverized coal boiler. The utility model aims to solve the problems that the air quantity of over fire air or secondary air is reduced and the rigidity is insufficient when the conventional pulverized coal boiler operates at a low load or under the condition that the air quantity of the secondary air is needed to be controlled during air staging. An air flue and a nozzle are divided into two or three parts through separators, the flow is regulated through an eccentric air door baffle, a group of small separators and two small choke plates, at least one part of air is high-speed jet at the outlet under different air door openings, and the jet has high penetrability. The over fire air and secondary air regulation device is mainly used for air quantity regulation in a coal-fired boiler.
Description
Technical field
The utility model belongs to coal-powder boiler boiler air quantity regulation technology, is specifically related to a kind of after-flame wind and secondary air regulation device for pulverized-coal fired boiler.
Background technology
Coal-powder boiler tangential firing technology refers generally to breeze airflow introduces burner hearth and carries out the mode of tangential rotary combustion from being arranged in the parallel flow burner of 4 jiaos, burner hearth (or 6 jiaos, 8 jiaos, on water-cooling wall).The wind powder mixture co-operating coming by each angle forms a strong eddy flow fireball burning in stove.The geometric center lines in each wind, Secondary Air, tertiary air and after-flame wind air port is all tangent with one or several imaginary circle of central authorities respectively.
The in the situation that of different load, the flow by increasing and decreasing each layer of wind, Secondary Air, tertiary air is to meet the needs of boiler combustion.Due to the needs of peak load regulation, often boiler will move under the operating mode of less than 50% rated load, and the required air quantity of boiler reduces greatly than design load.Because spout size is certain, this causes lip jet speed greatly to reduce.In addition, in the situation that boiler is carried out to air classification, by increasing after-flame wind, reduce Secondary Air and can effectively control the stoichiometric ratio in primary zone, and then significantly reduce the generation of nitrogen oxide, this need to reduce the speed of Secondary Air equally.For the Secondary Air in primary zone, in the time of underspeed, in entirety stove, tangential flowing is affected, and the too early same wind of Secondary Air of dispersing mixes, and this is also disadvantageous for controlling nitrogen oxide.For after-flame wind, under underload, deficiency in draught causes Speed Reduction, and jet penetrability deficiency also easily causes boiler fly ash combustible content to raise.
For above problem, in China Patent Publication No. CN101806450B (a kind of combustion exhausted wind apparatus that is applicable to different load pulverized-coal type boiler), mention after-flame wind snout is divided into coaxial from inside to outside multiple parts, each air channel is controlled by valve separately, and on middle air channel and outer air duct, rotating vane being set, this design mainly meets the needs of swirl flow combustion boiler.In China Patent Publication No. CN1587798A (keeping secondary wind speed stable combustion technology when boiler at low load), mention on straight flow combustion boiler and be divided into two passages by dividing plate is set on secondary air duct, and in a passage, damper is set therein, in the time that boiler load reduces, reduce the air quantity in this air channel, ensure that the wind speed of another passage does not reduce.The problem that this design exists is that the air quantity of another passage cannot control effectively, and need to before passage, increase one group of air door control equipment while even closing again and can realize the air quantity of two passages all need to being reduced.
Utility model content
The purpose of this utility model is the problem in order to solve existing Secondary Air and after-flame wind jet rigidity deficiency underload or the low air quantity in the situation that, and then a kind of pulverized-coal fired boiler after-flame wind and secondary air regulation device are provided.
The technical solution of the utility model is: a kind of after-flame wind and secondary air regulation device for pulverized-coal fired boiler, it is characterized in that: comprise main air duct (1), eccentric adjusting baffle plate (2), rotating shaft (3), dividing plate (5), high wind speed spout (6), low wind speed spout (7), main air duct (1) is divided into high speed air channel (11) and low speed air channel (12) by dividing plate (5), in the main air duct (1) in dividing plate (5) front, eccentric adjusting baffle plate (2) is set, when baffle plate complete shut-down on it lower limb respectively near the internal face up and down of main air duct, the rotating shaft (3) of eccentric adjusting baffle plate (2) is in low speed air channel (12) one sides, in the low speed air channel (12) at eccentric adjusting baffle plate (2) rear, one group of small baffle (4) is set, the different parts of eccentric adjusting baffle plate (2) arranges respectively the little spoiler of high speed (9) and the little spoiler of low speed (10), the outlet in high speed air channel (11) arranges high speed spout (6), and the outlet of low speed air channel (12) arranges slow-running jet (7).
The utility model compared with prior art has following effect: the utility model is simple in structure, do not need to increase new control appliance, main by an eccentric baffle plate and some dividing plates and spoiler, realize the air quantity adjustment under different load of Secondary Air or after-flame wind, ensureing under different load, to have at least in a passage has relatively high wind speed, and then ensures the rigidity of jet.Air quantity can also be closed to minimum, to meet the needs of boiler special operation condition simultaneously.For Secondary Air, high-speed jet can ensure normal rotational flow in stove preferably, postpones the mixing with a wind, is conducive to the control of boiler nitrogen oxide.For after-flame wind, high-speed jet promoted with the hybrid perturbation between main flow, and then strengthened the after-flame of residue of combustion, reduced gaseous combustible thing content and the unburned combustible in fly ash in tail flue gas.
Brief description of the drawings
Fig. 1 is the utility model list damper structural representation; Fig. 2 is the spout schematic diagram of the utility model list damper structure; Fig. 3 is the utility model list damper structure chart; Fig. 4 is the utility model damper partial structurtes enlarged drawings; Fig. 5 is the two damper structural representations of connecting rod of the present utility model; Fig. 6 is the spout schematic diagram of the two damper structures of connecting rod;
Detailed description of the invention
Detailed description of the invention one: in conjunction with Fig. 1, Fig. 2, Fig. 3, present embodiment is described, present embodiment comprises main air duct 1, controllable register 2, rotating shaft 3, dividing plate 5, high wind speed spout 6, low wind speed spout 7 etc.Main air duct 1 is divided into high speed air channel 11 and low speed air channel 12 by dividing plate 5, eccentric adjusting baffle plate 2 is set in the main air duct in dividing plate front, while closing completely on it lower limb respectively near the internal face up and down of main air duct, the rotating shaft 3 of eccentric adjusting baffle plate is in low speed air channel one side, one group of small baffle 4 is set in the low speed air channel 12 at baffle plate rear, and the different parts of baffle plate 2 arranges respectively the little spoiler 9 of high speed and the little spoiler 10 of low speed.The outlet in high speed air channel 11 arranges high speed spout 6, and the outlet in low speed air channel 12 arranges slow-running jet 7.
Detailed description of the invention two: in conjunction with Fig. 1 and Fig. 5, present embodiment is described, this device mainly comprises A district, B district, C district, D district.Wherein A district (damper control section) mainly carries out allocation of the amount of air, and B district (linkage section) is the linkage section from bellows to spout, can be straight linkage section, can be also curved linkage section, and C district is straight section before spout, and D district is spout section.
Detailed description of the invention three: in conjunction with Fig. 1, Fig. 2, Fig. 3 and Fig. 4, present embodiment is described, main air duct 1 is divided into high speed air channel 11 and low speed air channel 12 by dividing plate 5, and the Area Ratio between high-speed channel 11 and low speed passage 12 is 4: 6 to 6: 4.Rotating shaft 3 is arranged on low speed air channel one side.Controllable register 2 is rotated axle 3 and is divided into long and short two part, and the two ratio is 2: 1 to 3.5: 1.When air door controllable register, controllable register 2 is for being in tilted layout in air channel during in complete shut-down state, and the short side part of described controllable register rolls tiltedly towards low speed air channel, and inclination angle beta is 6 ° to 15 °, carries out spacing with limiting plate 8.At the different parts of controllable register 2, little spoiler is set simultaneously, the little spoiler 9 of its high speed is positioned at the baffle plate lee face of high-speed side near the position of dividing plate 5, the little spoiler 10 of low speed is positioned at the position of the baffle plate windward side close end of low speed side, in order to the allocation of the amount of air of further control two parts passage.In low speed air channel after simultaneously one group of small baffle 4 (1,2 or 3) that is parallel to dividing plate 5 being arranged on to controllable register 2, on dividing plate 5, in order to control the circulation of air between high speed air channel 11 and low speed air channel 12.In addition, between this device baffle plate 2 left and right sides and main air duct 1, leave certain gap, to ensure still there is certain air quantity cooled nozzle the air door contract fully in the situation that.
Detailed description of the invention four: in conjunction with Fig. 5 and Fig. 6, present embodiment is described, in the time of air channel and the two damper of the larger needs employing of spout, two dampers 2 are arranged symmetrically with, and realize two air door plate washers interlocks by connecting rod 13.In the middle of high speed air channel 11 is arranged on, two low speed air channels 12 are arranged on both sides.
Detailed description of the invention five: in conjunction with Fig. 1 and Fig. 5, present embodiment is described, this device should adopt up and down and arrange in the time that spout is large ratio of height to width, and namely main air duct is divided into upper and lower two parts by baffle plate and dividing plate.Be that the appropriate to the occasion employing of small height-width ratio left and right is arranged at spout, namely main air duct is divided into two parts in left and right by baffle plate and dividing plate.
Taking a single damper volume adjusting apparatus as example, the Area Ratio between high-speed channel 11 and low speed passage 12 is 1: 1 (also 5: 5), and controllable register 2 is rotated axle 3 and is divided into long and short two part, L1: L2=3: 1.Controllable register 2 initial tilt angle β are 12 °.Be below under different boiler loads and different speed of incoming flow, in conjunction with flowing in stove, the numerical simulation result that carries out air quantity adjustment according to throttle opening (wherein controllable register 2 is in 90 ° with entrance section when 100% aperture, and when 0% aperture, entrance section becomes 12 ° of initial inclinations).From following table, can see, although overall inlet velocity reduces, the end opening of new equipment or right mouthful (being high speed air channel) are still keeping relatively high wind speed.
Under identical speed of incoming flow, the allocation of the amount of air result after the throttle opening under each load is turned down is as following table.Lower air port or right mouthful of (being high speed air channel) the speed increase rate that from following table, can see new equipment are obvious in the time of high load capacity, increase less when 50%THA.
Note: BMCR:boiler maximum continue rate, boiler maximum continuous rating;
THA:turbine heat acceptance, steam turbine nominal output (steam turbine hear rate is checked and accepted operating mode).
As mentioned above, controllable register 2 is divided into long and short two part by off-centered rotating shaft 3, adopt the method for numerical simulation to calculate respectively L1: L2=2: 1, the operating mode of 3: 1 and 4: 1 these three eccentric positions is (for preventing from going here and there wind, the corresponding above eccentric position of horizontal baffle 4 after baffle plate is respectively one, two and three), result of calculation is as following table.From following table, can find out, the in the situation that of identical entrance air quantity, along with moving on eccentric position, on new equipment, vent wind speed reduces gradually, and lower vent wind speed increases gradually.This is favourable to strengthening jet rigidity.But consider in the situation of large eccentric ratio, lower spout speed in the time that inlet velocity improves also will significantly increase, and resistance and speed are quadratic relationship, so this will cause the significantly increase of entire system resistance.Considering the eccentric ratio of baffle plate can be preferably between 2: 1 to 3.5: 1.
Claims (7)
1. after-flame wind and secondary air regulation device for a pulverized-coal fired boiler, it is characterized in that: comprise main air duct (1), eccentric adjusting baffle plate (2), rotating shaft (3), dividing plate (5), high wind speed spout (6), low wind speed spout (7), main air duct (1) is divided into high speed air channel (11) and low speed air channel (12) by dividing plate (5), in the main air duct (1) in dividing plate (5) front, eccentric adjusting baffle plate (2) is set, when baffle plate complete shut-down on it lower limb respectively near the internal face up and down of main air duct, the rotating shaft (3) of eccentric adjusting baffle plate (2) is in low speed air channel (12) one sides, in the low speed air channel (12) at eccentric adjusting baffle plate (2) rear, one group of small baffle (4) is set, the different parts of eccentric adjusting baffle plate (2) arranges respectively the little spoiler of high speed (9) and the little spoiler of low speed (10), the outlet in high speed air channel (11) arranges high speed spout (6), and the outlet of low speed air channel (12) arranges slow-running jet (7).
2. after-flame wind and secondary air regulation device for pulverized-coal fired boiler according to claim 1, is characterized in that: eccentric adjusting baffle plate (2) is rotated axle (3) and is divided into long and short two part, and the two ratio is 2: 1 to 3.5: 1; When air door during in complete shut-down state eccentric adjusting baffle plate (2) in air channel for being in tilted layout, the short side part of described controllable register rolls tiltedly towards low speed air channel, and the initial angle (β) of the entirety of described controllable register and air channel vertical cross-section is 6 ° to 15 °.
3. after-flame wind and secondary air regulation device for pulverized-coal fired boiler according to claim 1, it is characterized in that: one group of small baffle (4) is arranged in the low speed air channel of eccentric adjusting baffle plate (2) afterwards, on dividing plate (5), controls the circulation of air between high speed air channel (11) and low speed air channel (12).
4. after-flame wind and secondary air regulation device for pulverized-coal fired boiler according to claim 1, it is characterized in that: the different parts at eccentric adjusting baffle plate (2) arranges little spoiler, the little spoiler of its high speed (9) is positioned at eccentric adjusting baffle plate (2) lee face of high-speed side near the position of dividing plate (5), eccentric adjusting baffle plate (2) windward side that the little spoiler of low speed (10) is positioned at low speed side approaches the position of end, controls the allocation of the amount of air in high speed air channel (11) and low speed air channel (12).
5. after-flame wind and secondary air regulation device for pulverized-coal fired boiler according to claim 1, it is characterized in that: between the left and right sides of eccentric adjusting baffle plate (2) and main air duct (1) internal face, leave certain gap, in the time that baffle plate is closed completely, pass through cooling air.
6. after-flame wind and secondary air regulation device for pulverized-coal fired boiler according to claim 1, is characterized in that: the Area Ratio between high speed air channel (11) and low speed air channel (12) is 4: 6 to 6: 4.
7. after-flame wind and secondary air regulation device for pulverized-coal fired boiler according to claim 1, it is characterized in that: at air channel and spout compared with large and while adopting the two damper of connecting rod, in the middle of high speed air channel (11) is arranged on, two low speed air channels (12) are arranged on both sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420220986.9U CN203810390U (en) | 2014-04-27 | 2014-04-27 | Over fire air and secondary air regulation device for pulverized coal boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420220986.9U CN203810390U (en) | 2014-04-27 | 2014-04-27 | Over fire air and secondary air regulation device for pulverized coal boiler |
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| CN203810390U true CN203810390U (en) | 2014-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420220986.9U Expired - Fee Related CN203810390U (en) | 2014-04-27 | 2014-04-27 | Over fire air and secondary air regulation device for pulverized coal boiler |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103953919A (en) * | 2014-04-27 | 2014-07-30 | 大唐(北京)能源管理有限公司 | Burning-out air and secondary air adjusting device of pulverized coal boiler |
| CN105605563A (en) * | 2016-01-25 | 2016-05-25 | 中国大唐集团科学技术研究院有限公司华东分公司 | Water wall high-temperature corrosion monitoring and control device and method for wall type tangentially-fired boiler |
| CN110873213A (en) * | 2018-08-31 | 2020-03-10 | 芜湖美的厨卫电器制造有限公司 | Gas proportional valve and gas water heater |
| CN110966590A (en) * | 2019-12-04 | 2020-04-07 | 国网浙江省电力有限公司电力科学研究院 | Primary and secondary air coupling jet system and operation method thereof |
-
2014
- 2014-04-27 CN CN201420220986.9U patent/CN203810390U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103953919A (en) * | 2014-04-27 | 2014-07-30 | 大唐(北京)能源管理有限公司 | Burning-out air and secondary air adjusting device of pulverized coal boiler |
| CN105605563A (en) * | 2016-01-25 | 2016-05-25 | 中国大唐集团科学技术研究院有限公司华东分公司 | Water wall high-temperature corrosion monitoring and control device and method for wall type tangentially-fired boiler |
| CN110873213A (en) * | 2018-08-31 | 2020-03-10 | 芜湖美的厨卫电器制造有限公司 | Gas proportional valve and gas water heater |
| CN110966590A (en) * | 2019-12-04 | 2020-04-07 | 国网浙江省电力有限公司电力科学研究院 | Primary and secondary air coupling jet system and operation method thereof |
| CN110966590B (en) * | 2019-12-04 | 2021-08-03 | 国网浙江省电力有限公司电力科学研究院 | Primary and secondary air coupling jet system and operation method thereof |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140903 |