CN102889607B - Direct fired pulverizing system of smoke drying lignite coal fan mill - Google Patents
Direct fired pulverizing system of smoke drying lignite coal fan mill Download PDFInfo
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Abstract
The invention discloses a direct fired pulverizing system of a smoke drying lignite coal fan mill, which comprises a high temperature furnace smoke pipe and a hot wind mixer, wherein the high temperature furnace smoke pipe is formed by arranging a cluster of circular pipes in parallel to form a flue; the circular pipes are located in a vapor-water circulating system of a power plant; an outlet of the high temperature furnace smoke pipe is communicated with a down drying tube; an inlet is communicated with a hot smoke pumping port of a boiler furnace; the hot wind mixer is connected between a classifier and a pulverized coal distributer; the other route of the hot wind device is connected to the hot wind mixer; and a coal inlet of the fan coal mill is further connected with a cool smoke pumping port of the boiler flue. The direct fired pulverizing system of the smoke drying lignite coal fan mill has the advantages of safety in operation, simple structure, low investment and being capable of effectively utilizing heat energy of high-quality smoke.
Description
Technical field
The invention belongs to coal-fired power generator set field, relate to brown coal generation technology, specifically, relate to pulverized coal preparation system and the combustion system of lignite-fired plant boiler.
Background technology
Brown coal are pit coals that degree of coalification is minimum, are to change the initial stage product of organic-biological rock into through dehydration, compacting after peat deposits, gain the name because appearance is brown or crineous.Brown coal account for 18% of China's thermal coal reserves, are mainly distributed in the areas such as the Inner Mongol, northeast and Yunnan.Brown coal have the features such as volatile matter high (Vdaf > 37%), moisture high (total moisture is about 30%, and free moisture is mostly more than 19%), caloric value low (about 12.56MJ/kg), ash fusion point low (about 1150 DEG C), low (HGI is 50-70) of abrasiveness and easy spontaneous combustion.The feature of brown coal " two high three low " determines its pulverized coal preparation system and has certain particularity.
In power station boiler pulverizing system, the maximum difference of all kinds of pulverized coal preparation system is coal pulverizer type.In pulverized coal preparation system, coal pulverizer is disintegrating apparatus, is also crucial raw coal drying equipment.The coal pulverizer widely applied at present mainly contains low speed coal mill, medium-speed pulverizer and blower mill three major types.Coal pulverizer type selecting is main relevant with raw coal moisture, grindability and abrasiveness.Because most of brown coal moisture is higher and abrasiveness is more weak, therefore the blower mill unit pulverized-coal system that extensive use drying capacity is stronger in current combustion lignite-fired unit.According to the difference of drying medium, direct feed pulverized coal-fan mill pulverized coal preparation system also can be divided into second medium (hot blast and hot cigarette) and three media (hot blast, hot cigarette and cold smoke) drying system.
No matter second medium or three medium systems, drier mixes by flue gas and air.Therefore higher containing oxygen in drying medium, easily making to catch fire in pulverized coal preparation system, the accident such as detonation, is the subject matter affecting the safe operation of brown coal pulverized coal preparation system.
In addition, current high-temperature furnace smoke pipeline adopts inside holding and Surgery therapy two kinds of structural shapes.In its actual motion, heat-insulation layer comes off and causes the accident that pipeline liner plate and expansion joint burn to happen occasionally, and pipe safety reliability is poor, for a long time the safe and stable operation of the brown coal of impact combustion always generating set.In addition, the high-temperature flue gas temperatures as high more than 1000 of furnace outlet is spent, for the insulation layer thickness reducing radiation loss inside holding or Surgery therapy high-temperature furnace smoke pipeline is in the past many at more than 350mm, a large amount of insulation material and a large amount of manpower and materials need be consumed on the one hand thus for construction, also make pipeline weight very large simultaneously, correspondingly make the load of unit steel structures coating comparatively large, steel consumption increases thereupon.Outside in insulation construction, pipe lining plate adopts a large amount of heat-resisting alloy steel, also makes pipeline investment obviously increase.Therefore, there is the outstanding problem that initial cost is excessive, safety in operation is poor, maintenance cost is larger in the high-temperature furnace smoke pipeline of inside holding or Surgery therapy structural shape in the past.
Further, in fan mill brown coal pulverized coal preparation system, the high-temperature flue gas temperatures as high more than 1000 extracted from furnace outlet is spent, and belongs to high-quality heat energy in boiler thermodynamic system.Ventilate and the integration requirement of drying according to blower mill, required drier initial temperature is generally 600-800 DEG C of scope.Second medium in the past and three medium drying systems arrange mixing chamber at burner hearth smoking mouth place mostly, and high-temperature flue gas and hot blast in mixing chamber (or hot blast and cold smoke) mix thus mist temperature be down to the drier initial temperature needed for fuel pulverized coal preparation system.This is actually a part of low temperature drying agent of the high-quality flue gas utilizing degree more than 1000 for pulverized coal preparation system.These a large amount of high-grade smoke heat energies that boiler combustion is produced fail for heat unit acting generating water or steam, cause unit efficiency to reduce.And in stove, directly extract the moderate oven cigarette of 600-800 DEG C, though feasible in theory, in Practical Project, there is pipe arrangement inconvenience wait Difficulty.
In sum, the second medium widely applied in known current station boiler and three medium brown coal pulverized coal preparation systems are all conceived to drying and the powder process of high water content brown coal, fail effectively to solve the safety problem of brown coal pulverized coal preparation system.And, adopt the high-temperature furnace smoke pipeline of inside holding or Surgery therapy structure to exist in fanned powder-grinding system and invest large, that operational reliability is poor outstanding problem.
Summary of the invention
Technical problem to be solved by this invention be to provide a kind of security of operation, structure simple, invest little, fully effectively to utilize high-quality smoke heat energy flue gas drying brown coal direct feed pulverized coal-fan mill pulverized coal preparation system, to overcome the deficiency that prior art exists.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of flue gas drying brown coal direct feed pulverized coal-fan mill pulverized coal preparation system, comprise blower mill, be connected to the descending drying tube before blower mill, outlet to the import of descending drying tube and inlet communication to the hot cigarette of boiler furnace take out mouth stove pipe road, be linked in sequence the mill separator after blower mill, pulverized coal distributor, and hot air apparatus; Described pulverized coal distributor is connected to the burner of boiler, and described hot air apparatus divides two-way, and a road connects burner; It is characterized in that: also include high-temperature furnace smoke pipeline and hot air mixer, described high-temperature furnace smoke pipeline surrounds flue by cluster pipe parallel arranged and forms, described pipe is arranged in the steam-water circulation system of power plant, and the outlet of described high-temperature furnace smoke pipeline takes out mouth to descending drying tube, inlet communication to the hot cigarette of boiler furnace, described hot air mixer is connected between mill separator and pulverized coal distributor and another road of hot air apparatus is connected to this hot air mixer; The cold smoke that the coal feed point of blower mill is also connected to the flue of boiler takes out mouth.
Adopt technique scheme, tool of the present invention has the following advantages:
1, high-temperature furnace smoke pipeline is connected with descending drying tube, adopt high-temperature flue gas as the drier of raw coal pre-drying process in descending drying tube, the hot cigarette adopting descending drying tube outlet temperature to reduce and the cold smoke mixture from boiler flue are as the ventilation and the drying medium that enter coal pulverizer.Flue gas oxygen content is low, belongs to inert media.And minimum from the high-temperature flue gas oxygen content of furnace outlet, therefore can effectively prevent detonation in descending drying tube.Coal pulverizer inlet passes into cold smoke, can supplement on the one hand and ensure the coal pulverizer ventilation that reduces because cancellation hot blast is mixed into before coal pulverizer, cold smoke temperature is low on the other hand, can ensure that coal pulverizer inlet temperature is in the scope of its safe operation, also effectively avoids coal pulverizer inlet to catch fire simultaneously.
2, high-temperature furnace smoke pipeline is surrounded by cluster water flowing (or vapour) pipe parallel arranged and forms, and simple, the corresponding steel structures coating steel consumption of structure is also minimized, and installation very easy, invest little.In addition, the pipe tube bundle that water flowing (or vapour) cools and flue gas directly contact and heat exchange, no longer there is heat-insulation layer and come off and caused burn out the problem such as liner plate or expansion joint, safe and reliable to operation.
3, the high-temperature furnace smoke pipeline surrounded by cluster water flowing (or vapour) pipe parallel arranged be conveying high-temperature flue gas flue be also the one group of heating surface reducing its temperature for absorbing smoke heat energy, high-grade smoke heat energy is able to by the steam-water circulation system of unit acting generating used, improves unit generation efficiency.
In sum, flue gas drying brown coal direct feed pulverized coal-fan mill pulverized coal preparation system of the present invention have security of operation, structure simple, invest little, fully effectively to utilize high-quality smoke heat energy advantage.
Accompanying drawing explanation
By the description carried out its exemplary embodiment below in conjunction with accompanying drawing, the above-mentioned feature and advantage of the present invention will become apparent and easy understand.
Fig. 1 is system construction drawing of the present invention.
Detailed description of the invention
As shown in Figure 1, flue gas drying brown coal fanned powder-grinding system of the present invention, comprise raw coal bucket 1, automatic scales claim 2, feeder 3, descending drying tube 4, blower mill 5, mill separator 6, pulverized coal distributor 7, burner 8, pressure fan 9, air preheater 10, secondary air bellow 12, high-temperature furnace smoke pipeline 16, smoke duster 17, air-introduced machine 18, cold smoke blower fan 20, cold smoke pipeline 21, hot air mixer 22, cold smoke arm 23.
Wherein, raw coal bucket 1 claims 2 connection feeders 3 through automatic scales, and feeder 3 is connected to the coal feed point of descending drying tube 4, and the coal outlet of descending drying tube 4 is connected to the coal feed point of blower mill 5.The coal outlet of blower mill 5 connects the coal feed point of mill separator 6, the meal outlet of mill separator 6 connects the coal feed point of low speed coal mill 6 again by powder retrieving pipe, the fine powder outlet of mill separator 6 connects hot air mixer 22, hot air mixer 22 is connected to pulverized coal distributor 7, and pulverized coal distributor 7 is finally connected to the burner 8 of boiler.
Pressure fan 9 and air preheater 10 form hot air apparatus, wherein air preheater 10 is arranged in the flue of boiler 13, it is outer and be connected with air preheater 10 that pressure fan 9 is positioned at flue, air preheater 10 points of two-way, one tunnel is connected to burner 8 through secondary air bellow 12, and another road is connected to hot air mixer 22.
Cold smoke take out after mouth is arranged on boiler 13 flue tail flue gas dust removal device 17 with on air-introduced machine 18 exhaust pass, boiler exhaust gas divides two-way thus, one road is connected to chimney 19, and another road is connected to the coal feed point of blower mill 5 through cold smoke blower fan 20 and cold smoke pipeline 21.
High-temperature furnace smoke pipeline 16 is surrounded by cluster water flowing (or vapour) pipe parallel arranged, and its outside has the external thermal insulation of thinner thickness.The outlet of high-temperature furnace smoke pipeline 16 takes out mouth 14 to descending drying tube 4, inlet communication to the hot cigarette of boiler 13 burner hearth.Water flowing (or vapour) pipe has cooling water (or vapour) import being positioned at high-temperature furnace smoke pipeline 16 outlet side, is positioned at hot cigarette and takes out mouth 14 side and have cooling water (or vapour) and export 25.Water flowing (or vapour) pipe is connected in the steam-water circulation system of power plant.
In addition, cold smoke pipeline 21 also has cold smoke arm 23, this cold smoke arm 23 is communicated to the outlet of high-temperature furnace smoke pipeline 16.
Be exactly more than smoke drying steel ball brown-coal milling system of the present invention, its working method is as follows:
Brown coal raw coal sends into descending drying tube 4 from raw coal bucket 1 through automatic balance 2 and feeder 3, take out mouth 14 at descending drying tube 4 top with from the hot cigarette of burner hearth and to carry through high-temperature furnace smoke pipeline 16 and the high-temperature flue gas that cools mixes and descendingly completes raw coal pre-drying process, take out mouth at coal pulverizer 5 entrance and the cold smoke from boiler 13 afterwards and enter coal pulverizer 5 after the cold smoke hybrid cooling carried through cold smoke blower fan 20 and cold smoke pipeline 21, further drying is able in the process that coal grain is broken in coal pulverizer 5, wind powder mixture after grinding enters mill separator 6, isolated meal is sent coal pulverizer 5 back to by powder retrieving pipe and is continued to grind, qualified coal dust and weary gas mix hot blast through hot air mixer 22 and then after pulverized coal distributor 7 distributes, are sent to burner 8 in stove combustion.
Coal pulverizer inlet temperature and coal pulverizer ventilation are regulated by cold smoke, and cold smoke arm 23 leads to water (or vapour) cold type close arranging pipe high-temperature furnace smoke pipeline 16 and exports to regulate the temperature levels in descending drying tube 4.Cooling water (or vapour) from the Unit Steam Water circulatory system enters high-temperature furnace smoke pipeline 16 from cooling water (or vapour) entrance 24, then exports 25 discharges from cooling water (or vapour) and returns the power plant steam-water circulatory system.
Cold air is sent into after air preheater 10 heats by pressure fan 9 and is divided into two-way, and a road enters hot air mixer 22 and carries out powder feeding, and another road is sent to each burner 8 as Secondary Air and is participated in stove combustion after secondary air box 12 is distributed.
Smoke drying steel ball brown-coal milling system of the present invention, compared with existing direct feed pulverized coal-fan mill pulverized coal preparation system, has following characteristics:
(1), with inert gas flue gas for drying medium, effectively prevent brown coal from catching fire and detonation, pulverized coal preparation system security is good.Adopt from the hot cigarette of furnace outlet as the drier in descending drying tube, adopt hot cigarette to ventilate and drying medium as coal pulverizer with cold smoke mixing gained flue gas, these are obviously different from existing fanned powder-grinding system on drying medium.
(2), water (or vapour) cold type close arranging pipe high-temperature furnace smoke pipeline not only significantly reduces high-temperature furnace smoke pipeline manufacture, transport, installation and maintenance cost, and security of operation, reliability is high, solves all problems that inside holding or Surgery therapy high-temperature furnace smoke pipeline in the past exist.
(3), water (or vapour) cold type close arranging pipe high-temperature furnace smoke pipeline make high-grade smoke heat energy be able to by unit acting generating steam-water circulation system used, both improve unit generation efficiency, also avoid in stove the pipe arrangement difficulty directly extracting moderate oven cigarette and face simultaneously.
(4), this patent system both can be applicable to the pulverizing system transformation of in-service combustion brown coal generating set, also can be applicable to newly-built combustion brown coal generating set.
But, those of ordinary skill in the art will be appreciated that, above embodiment is only used to the present invention is described, and be not used as limitation of the invention, as long as in spirit of the present invention, all will drop in Claims scope of the present invention the change of the above embodiment, modification.
Claims (2)
1. a flue gas drying brown coal direct feed pulverized coal-fan mill pulverized coal preparation system, comprise blower mill, be connected to the descending drying tube before blower mill, outlet to the import of descending drying tube and inlet communication to the hot cigarette of boiler furnace take out mouth high-temperature furnace smoke pipeline, be linked in sequence the mill separator after blower mill, pulverized coal distributor, and hot air apparatus; Described pulverized coal distributor is connected to the burner of boiler, and described hot air apparatus divides two-way, and a road connects burner; It is characterized in that: also include hot air mixer, described high-temperature furnace smoke pipeline surrounds flue by cluster pipe parallel arranged and forms, described pipe is arranged in the steam-water circulation system of power plant, and described hot air mixer is connected between mill separator and pulverized coal distributor and another road of hot air apparatus is connected to this hot air mixer; The cold smoke that the coal feed point of blower mill is also connected to the flue of boiler takes out mouth.
2. flue gas drying brown coal direct feed pulverized coal-fan mill pulverized coal preparation system according to claim 1, is characterized in that: described cold smoke takes out mouth is also connected to high-temperature furnace smoke pipeline outlet through cold smoke arm.
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| CN103234215B (en) * | 2013-05-16 | 2015-06-03 | 昆明理工大学 | Blended pulverized coal combustion control device and method |
| CN103712224A (en) * | 2013-12-20 | 2014-04-09 | 鞍钢股份有限公司 | Method for increasing boiler coal pulverized system output |
| CN104235818B (en) * | 2014-09-30 | 2016-04-06 | 上海援梦电力能源科技咨询中心 | The coal of fan mill powder process and the green electricity generation system of mud multifuel combustion |
| CN104235817B (en) * | 2014-09-30 | 2016-04-06 | 上海援梦电力能源科技咨询中心 | The coal of fan mill and air swept mill powder process and the green electricity generation system of mud multifuel combustion |
| CN105865188B (en) * | 2016-04-08 | 2019-01-01 | 上海理工大学 | Circle of contact air inlet furnace cigarette mixing chamber and the boiler using brown coal including it |
| CN105716412B (en) * | 2016-04-08 | 2018-07-27 | 上海理工大学 | Swirling inlet stove cigarette mixing chamber and the boiler using brown coal including it |
| CN106287679A (en) * | 2016-08-11 | 2017-01-04 | 兰州理工大学 | A kind of pulverized-coal fired boiler high-temperature flue gas circulation controlling means |
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| CN109458809B (en) * | 2018-12-27 | 2024-01-23 | 西安热工研究院有限公司 | Lignite inert drying and sorting device and method for power station boiler |
| CN112393269A (en) * | 2020-11-19 | 2021-02-23 | 西安热工研究院有限公司 | Process for large-proportion coal slime mixed burning of medium storage type coal pulverizing system |
| CN113019667B (en) * | 2021-01-29 | 2022-06-14 | 华电电力科学研究院有限公司 | System and method for adjusting flue gas volume at coal mill inlet of fan mill pulverizing system |
| CN113932245A (en) * | 2021-11-08 | 2022-01-14 | 国网黑龙江省电力有限公司电力科学研究院 | Lignite fan mill boiler and safe and efficient bituminous coal blending combustion method thereof |
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