CN201589289U - Exhaust gas and hot air double-medium powder delivery system - Google Patents
Exhaust gas and hot air double-medium powder delivery system Download PDFInfo
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- CN201589289U CN201589289U CN2010201097942U CN201020109794U CN201589289U CN 201589289 U CN201589289 U CN 201589289U CN 2010201097942 U CN2010201097942 U CN 2010201097942U CN 201020109794 U CN201020109794 U CN 201020109794U CN 201589289 U CN201589289 U CN 201589289U
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Abstract
The utility model provides an exhaust gas and hot air double-medium powder delivery system and relates to a powder delivery system, belonging to the technical field of a coal-fired boiler. The utility model solves the problems of higher NOx emission and easy slagging of the existing hot air powder delivery system of the boiler. One end of a tertiary air pipeline and one end of an exhaust gas pipeline are both communicated with the output end of a powder exhauster; the other end of the tertiary air pipeline is communicated with a tertiary air nozzle on the boiler; an exhaust gas bellows is arranged on the tertiary air pipeline; the outlet end of a hot air pipeline and the other end of the exhaust gas pipeline are both communicated with one end of a primary air pipeline; the other end of the primary air pipeline is communicated with the inlet of a wind powder mixer; and the outlet of the wind powder mixer is communicated with one end of a primary air powder delivery pipeline. In the utility model, the supply air amount of a main burner area can be substantially reduced, the original tertiary air amount is supplied together at the upper burn out air nozzle, the operation of the main burner area is effectively ensured under the low excess air coefficient, and the NOx generation is substantially reduced.
Description
Technical field
The utility model relates to a kind of powder feed system, is specifically related to a kind of weary gas and hot-blast air dual-medium powder feeding system, belongs to the coal-burning boiler technical field.
Background technology
The more existing pulverized coal power boilers of China are when using bituminous coal, meager coal and anthracite, Pulverized Coal Bin, pulverized coal carried by hot air system (referring to Fig. 1) in the middle of extensively adopting, in these boilers, weary gas is as tertiary air, be usually placed in the burner the superiors, it arranges first and second wind snout down.The air quantity of tertiary air is about total blast volume 15～20%, wherein contains 10～15% coal dust.
The employing of tertiary air has influence to boiler tail NOx emission level.Tertiary air sprays in the stove, and its nozzle area burning excess air coefficient height is everlasting more than 2.0.Though the introducing of tertiary air, has the air classification combustion efficiency to a certain extent, the excess air factor in primary zone is reduced, strengthen the primary zone reducing atmosphere, help inhibition and the reduction of NOx, but because the tertiary air air quantity is limited, the furnace air classification is cooperated by primary and secondary air basically to be finished, tertiary air sprays into downwards with higher custom usually, and the oxygen debt burning in primary zone is had certain destruction.Tertiary air has coal dust, and these coal dusts are sprayed into a high temperature oxidation stability atmosphere burning, has increased the growing amount of NOx, has offset whole fractional combustion effect in the stove.Tertiary air is that the NOx discharging is obviously increased to the resultant effect of NOx, and increasing degree is relevant with the size of tertiary air rate, and the high more NOx growing amount of its wind rate is big more.
The employing of tertiary air has influence to stove internal combustion and steam temperature adjusting.For the boiler that uses high-volatile bituminous coal, though the pulverized coal carried by hot air system can improve the stability of coal dust in boiler stove internal combustion, but when its hot blast temperature is too high (about 200 ℃), spout place coal dust intermixture will be caught fire too early, cause spout slagging scorification, scaling loss, and the problem of burner region slagging scorification, when particularly using clinker(ing) coal matter, slagging scorification is even more serious.In addition, tertiary air is injected at a high speed, and the flame residual rotation is increased, and the furnace outlet gas temperature deviation is bigger, makes overheating steam temperature and reheat steam temperature deviation big, and steam temperature is regulated difficulty.Unburned combustible in fly ash is increased.When the tertiary air air quantity was big, wind speed also increased, and easily upset normal aerodynamic field in the stove, caused that flame pastes the wall slagging scorification.
The utility model content
The problem that the utility model exists in order to solve existing pulverized coal carried by hot air system boiler that the NOx discharge capacity is higher, easy slagging scorification etc. is caused by tertiary air, and then a kind of weary gas and hot-blast air dual-medium powder feeding system are proposed.
The utility model is to solve the problems of the technologies described above the technical scheme of taking to be: weary gas described in the utility model and hot-blast air dual-medium powder feeding system comprise mill exhauster, the tertiary air pipeline, tertiary air pipeline control valve, air and powder mixer, weary gas bellows, hot air duct, an airduct road, an airduct road control valve and a wind powder feeding pipes, described powder feed system also comprises blast pipe road rapid cut-off valve, blast pipe road and weary gas and hot air blender, the arrival end of described tertiary air pipeline, the arrival end in blast pipe road all is communicated with the output of mill exhauster, the port of export of tertiary air pipeline and the tertiary air spout connection on the boiler, tertiary air pipeline are provided with weary gas bellows; The port of export of hot air duct is communicated with the arrival end in an airduct road, described weary gas and hot air blender is arranged on airduct road, the port of export in blast pipe road is communicated with the weary gas blowout pipe of weary gas and hot air blender, the port of export in an airduct road is communicated with the inlet of air and powder mixer, the outlet of air and powder mixer is communicated with the arrival end of a wind powder feeding pipes, the port of export of a wind powder feeding pipes is communicated with burner on the boiler, the arrival end in an airduct road is provided with airduct road control valve one time, the blast pipe road is provided with blast pipe road rapid cut-off valve, and the tertiary air pipeline is provided with tertiary air pipeline control valve.
The beneficial effects of the utility model are:
The utility model proposes the mode that existing pulverized coal carried by hot air is changed into weary gas and hot-blast air dual-medium powder feeding, to lack gas and mix the back with hot blast as a wind, can effectively reduce wind wind-warm syndrome of burner outlet (controlling normal transporting pulverized coal with exhaust gas temperature), prevent slagging scorification and the tempering scaling loss of clinker(ing) coal at spout, can solve simultaneously near the slagging scorification problem the water-cooling wall, to the not influence of combustion stability of the bituminous coal that uses high volatile.The most outstanding advantage of the utility model is, can reduce the air capacity that infeeds in main burner district significantly, will guarantee effectively that the main burner district moves under the low excess air coefficient, subdues the growing amount of NOx significantly.Simultaneously to the cigarette temperature deviation of furnace outlet with organize rational Furnace Aerodynamic Field to have very big effect.
Tertiary air reduces the discharge capacity can reduce NOx, and transporting pulverized coal with exhaust gas also can reduce the discharge capacity of NOx owing to reduced temperature in the stove in primary zone, and the utility model exactly combines the advantage of above two aspects, can be more remarkable for the emission reduction effect of NOx.Behind wind of tertiary air displacement, the hot-air of being replaced will be infeeded by overfire air port and after-flame wind snout, and the hot blast air quantity of the air preheater of flowing through is constant, therefore will can not influence the exhaust gas temperature of boiler.
Realization of the present utility model only need be transformed existing pulverized coal carried by hot air system and be got final product, the retrofit work amount is little, small investment, only need to change, increase section of tubing and valve, by adjusting the hot blast door of hot air duct, change the hot blast rate of sneaking into, can realize that all coal pulverizers put into operation, the part coal pulverizer puts into operation and not have put into operation smooth transition between these three kinds of modes of coal pulverizer, easy to adjust, satisfy security, the stability requirement of boiler combustion.Therefore, the utility model will have realistic meaning, will produce considerable social benefit and economic benefit.
Description of drawings
Fig. 1 is that present power plant middle warehouse formula low speed coal mill pulverized coal carried by hot air pulverized coal preparation system structural representation commonly used is (among the figure: the 1-boiler, the 2-air preheater, the 3-pressure fan, the 4-feeder, 5-decline drying tube, the 6-coal pulverizer, the 7-wood block separator, the 8-mill separator, the 9-explosion proof door, the 10-pulverized-coal collector, the 11-flapper, the 12-wood scraps separator, the 13-commutator, 14-moisture absorption pipe, 15-spiral powder conveying machine, the 16-Pulverized Coal Bin, the 17-machine supplying powder, the 18-air and powder mixer, the 19-primary air fan, 20-lacks the gas bellows, the 21-mill exhauster, the 22-secondary air box, the 23-main burner, 24-tertiary air spout);
Fig. 2 is the structural representation (among the figure: 1-boiler, 16-Pulverized Coal Bin, 18-air and powder mixer, the weary gas bellows of 20-, 21-mill exhauster, 23-main burner, 24-tertiary air spout, 25-rapid cut-off valve, 26-tertiary air pipeline, 27-blast pipe road, 28-hot air duct, airduct road of 29-, wind powder feeding pipes of 30-, 31,32-control valve, the weary gas and hot air blender of 33-) that powder feed system described in the utility model is applied in coal-burning boiler system;
Fig. 3 is the annexation schematic diagram of hot air duct 28, airduct road 29 and weary gas and hot air blender 33;
Fig. 4 is the front view of weary gas and hot air blender, and Fig. 5 is the left view of Fig. 4.
The specific embodiment
The specific embodiment one: referring to Fig. 2～5, described weary gas of present embodiment and hot-blast air dual-medium powder feeding system comprise mill exhauster 21, tertiary air pipeline 26, tertiary air pipeline control valve 32, air and powder mixer 18, weary gas bellows 20, hot air duct 28, an airduct road 29, an airduct road control valve 31 and a wind powder feeding pipes 30, described powder feed system also comprises blast pipe road rapid cut-off valve 25, blast pipe road 27 and weary gas and hot air blender 33, the arrival end of described tertiary air pipeline 26, the arrival end in blast pipe road 27 all is communicated with the output of mill exhauster 21, the port of export of tertiary air pipeline 26 is communicated with tertiary air spout 24 on the boiler 1, and tertiary air pipeline 26 is provided with weary gas bellows 20; The port of export of hot air duct 28 is communicated with the arrival end in an airduct road 29, described weary gas and hot air blender 33 is arranged on airduct road 29, the port of export in blast pipe road 27 is communicated with the weary gas blowout pipe 33-1 of weary gas and hot air blender 33, the port of export in an airduct road 29 is communicated with the inlet of air and powder mixer 18, the outlet of air and powder mixer 18 is communicated with the arrival end of a wind powder feeding pipes 30, the port of export of a wind powder feeding pipes 30 is communicated with burner 23 on the boiler 1, the arrival end in an airduct road 29 is provided with airduct road control valve 31 one time, blast pipe road 27 is provided with blast pipe road rapid cut-off valve 25, and tertiary air pipeline 26 is provided with tertiary air pipeline control valve 32.
Described a kind of weary gas of present embodiment and hot-blast air dual-medium powder feeding send system in use, and the outlet of Pulverized Coal Bin 16 is communicated with the inlet of air and powder mixer 18.
The specific embodiment two: referring to Fig. 3～5, the described weary gas and hot air blender 33 of present embodiment is made of weary gas blowout pipe 33-1, warm-air pipe 33-2, mixing tube 33-3 and airtight hot blast receiving chamber 33-4, the end of weary gas blowout pipe 33-1 inserts in the airtight hot blast receiving chamber 33-4, mixing tube 33-3 and weary gas blowout pipe 33-1 be coaxial to be oppositely arranged and the end of mixing tube 33-3 is communicated with airtight hot blast receiving chamber 33-4, and the end of warm-air pipe 33-2 is communicated with airtight hot blast receiving chamber 33-4.The other end of weary gas blowout pipe 33-1 is communicated with blast pipe road 27, and the other end of the mixing tube 33-3 other end, warm-air pipe 33-2 all is communicated with an airduct road 29.The injector principle has been adopted in the design of weary gas and hot air blender 33.By the weary gas of weary gas blowout pipe 33-1 ejection as pressurized working fluid, from the hot blast of warm-air pipe 33-2 as driving fluid.Weary gas mixes in mixing tube 33-3 with hot blast, and not only mixed effect is better, can also effectively mate the resistance of ducting of weary gas system and secondary air system.Other composition and annexation are identical with the specific embodiment one.
Embodiment
Embodiment 1: boiler has a two-layer wind combustor, is equipped with two cover pulverized coal preparation systems.Every cover system comprises assemblies such as run coal bin, feeder, coal pulverizer, mill separator, pulverized-coal collector, mill exhauster and various pipelines.The all normally operations of two cover pulverized coal preparation systems.2 present embodiments are described in conjunction with the accompanying drawings.Weary gas and hot-blast air dual-medium powder feeding system comprise control valve 25, blast pipe road 27, hot air duct 28, airduct road 29, a wind powder feeding pipes 30.Close former tertiary air control valve, open the control valve in blast pipe road, the weary gas of mill exhauster outlet is infeeded in airduct road, adjust the hot blast control valve in an airduct road simultaneously according to wind wind speed, reach weary gas and mixes the purpose of failing powder jointly with hot blast.The hot-air of being replaced is infeeded in the stove by overfire air port or after-flame wind snout.The blast pipe road infeeds the principle of four wind snout of layer together with being connected in accordance with a mill exhauster of an airduct road.For system is normally moved, weary gas and the mixed speed of hot blast are about 26m/s.
Embodiment 2: boiler has a two-layer wind combustor, is equipped with two cover pulverized coal preparation systems.Every cover system comprises assemblies such as run coal bin, feeder, coal pulverizer, mill separator, pulverized-coal collector, mill exhauster and various pipelines.Has only the normal operation of a cover in the two cover pulverized coal preparation systems, another set of stoppage in transit.2 present embodiments are described in conjunction with the accompanying drawings.Weary gas and hot-blast air dual-medium powder feeding system comprise control valve 25, blast pipe road 27, hot air duct 28, airduct road 29, a wind powder feeding pipes 30.Close tertiary air pipeline control valve.Close simultaneously and the corresponding blast pipe of the mill exhauster of stopping transport road on control valve, cut off airduct road and pulverized coal preparation system, prevent that hot blast from bleeding in the pulverized coal preparation system.Open and move the control valve on the corresponding newly-increased row's tube cell of mill exhauster, the weary gas of mill exhauster outlet is infeeded in airduct road, turn down the hot blast control valve in an airduct road simultaneously according to wind wind speed, reach weary gas and mixes the purpose of failing powder jointly with hot blast.The blast pipe road infeeds the principle of four four wind snout of layer together with being connected in accordance with a mill exhauster of an airduct road.The defeated powder mode of a ducted coal dust of wind of the blast pipe road correspondence of stoppage in transit mill exhauster is reduced to former pulverized coal carried by hot air mode, and wind of whole system this moment becomes part and is weary gas and hot blast mixing automatic powder feeding system for hot blast, part.For system is normally moved, weary gas and the mixed speed of hot blast are about 28m/s.
Operation principle:
The utility model is to keep under the constant situation of former pulverized coal carried by hot air system operation characteristic, row's tube cell of every mill exhauster outlet is transformed replacing, keeping under the constant condition of former tertiary air row tube cell, increase some blast pipe roads 27, before a wind machine supplying powder, introduce in airduct road, thereby the weary gas that blast pipe road 27 is sent here is mixed with the hot blast that hot air duct 28 is sent here, be used for powder feeding as a wind jointly.Utilize by-pass valve control on blast pipe road and the airduct road, weary gas of control and the mixed speed V of hot blast
1Be 25-50m/s.On every blast pipe road, electric control valve is installed, can regulate the flow of weary gas by control valve, and can conveniently switch the former pulverized coal carried by hot air system of getting back to (when the control valve on the blast pipe road 27 was all closed, this moment, system just became existing pulverized coal carried by hot air system).The utility model has reduced wind wind-warm syndrome of burner outlet effectively, prevents slagging scorification and the tempering scaling loss of clinker(ing) coal at spout, can solve near the slagging scorification problem of water-cooling wall simultaneously.Its most outstanding advantage is, can reduce the air capacity that infeeds in main burner district significantly, guarantees that effectively the main burner district moves under the low excess air coefficient, subdues the growing amount of NOx significantly.Simultaneously to the cigarette temperature deviation of furnace outlet with organize rational Furnace Aerodynamic Field to have very big effect (referring to Fig. 2).
Also can control weary gas and the mixed speed V of hot blast
1Be 35～45m/s, can guarantee the speed in the wind powder feeding pipes 30 like this, when the burning ash coal, can effectively solve the line clogging problem greater than 28m/s.
Also can control weary gas and the mixed speed V of hot blast
1Be 30～40m/s, can guarantee that like this speed in the wind powder feeding pipes 30 is greater than 25m/s.
Claims (2)
1. weary gas and hot-blast air dual-medium powder feeding system, described powder feed system comprises mill exhauster (21), tertiary air pipeline (26), tertiary air pipeline control valve (32), air and powder mixer (18), weary gas bellows (20), hot air duct (28), an airduct road (29), an airduct road control valve (31) and a wind powder feeding pipes (30), it is characterized in that: described powder feed system also comprises blast pipe road rapid cut-off valve (25), blast pipe road (27) and weary gas and hot air blender (33), the arrival end of described tertiary air pipeline (26), the arrival end in blast pipe road (27) all is communicated with the output of mill exhauster (21), the port of export of tertiary air pipeline (26) is communicated with tertiary air spout (24) on the boiler (1), and tertiary air pipeline (26) is provided with weary gas bellows (20); The port of export of hot air duct (28) is communicated with the arrival end in an airduct road (29), described weary gas and hot air blender (33) is arranged on the airduct road (29), the port of export in blast pipe road (27) is communicated with the weary gas blowout pipe (33-1) of weary gas and hot air blender (33), the port of export in an airduct road (29) is communicated with the inlet of air and powder mixer (18), the outlet of air and powder mixer (18) is communicated with the arrival end of a wind powder feeding pipes (30), the port of export of a wind powder feeding pipes (30) is communicated with burner (23) on the boiler 1, the arrival end in an airduct road (29) is provided with an airduct road control valve (31), blast pipe road (27) is provided with blast pipe road rapid cut-off valve (25), and tertiary air pipeline (26) is provided with tertiary air pipeline control valve (32).
2. a kind of weary gas according to claim 1 and hot-blast air dual-medium powder feeding system, it is characterized in that: described weary gas and hot air blender (33) is by weary gas blowout pipe (33-1), warm-air pipe (33-2), mixing tube (33-3) and airtight hot blast receiving chamber (33-4) constitute, one end of weary gas blowout pipe (33-1) inserts in the airtight hot blast receiving chamber (33-4), mixing tube (33-3) and weary gas blowout pipe (33-1) be coaxial to be oppositely arranged and an end of mixing tube (33-3) is communicated with airtight hot blast receiving chamber (33-4), and an end of warm-air pipe (33-2) is communicated with airtight hot blast receiving chamber (33-4).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010201097942U CN201589289U (en) | 2010-02-05 | 2010-02-05 | Exhaust gas and hot air double-medium powder delivery system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010201097942U CN201589289U (en) | 2010-02-05 | 2010-02-05 | Exhaust gas and hot air double-medium powder delivery system |
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| CN201589289U true CN201589289U (en) | 2010-09-22 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103438474A (en) * | 2013-09-12 | 2013-12-11 | 大唐鸡西热电有限责任公司 | Partial-exhaust-gas-participated hot-air powder conveying comprehensive utilization system of boiler pulverizing system |
| CN104344398A (en) * | 2013-07-31 | 2015-02-11 | 烟台龙源电力技术股份有限公司 | Middle storage type hot wind powder feeding and pulverizing system |
| CN104807004A (en) * | 2015-04-15 | 2015-07-29 | 华南理工大学 | Rough and fine coal powder separating and combusting device in coal powder pipe |
-
2010
- 2010-02-05 CN CN2010201097942U patent/CN201589289U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104344398A (en) * | 2013-07-31 | 2015-02-11 | 烟台龙源电力技术股份有限公司 | Middle storage type hot wind powder feeding and pulverizing system |
| CN104344398B (en) * | 2013-07-31 | 2016-08-10 | 烟台龙源电力技术股份有限公司 | Middle warehouse formula pulverized coal carried by hot air pulverized coal preparation system |
| CN103438474A (en) * | 2013-09-12 | 2013-12-11 | 大唐鸡西热电有限责任公司 | Partial-exhaust-gas-participated hot-air powder conveying comprehensive utilization system of boiler pulverizing system |
| CN103438474B (en) * | 2013-09-12 | 2016-01-20 | 大唐鸡西热电有限责任公司 | The weary gas of boiler milling system part participates in pulverized coal carried by hot air utilization system |
| CN104807004A (en) * | 2015-04-15 | 2015-07-29 | 华南理工大学 | Rough and fine coal powder separating and combusting device in coal powder pipe |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100922 Termination date: 20130205 |