CN102798133B - Fan grinding hot blast powder feeding and pulverizing system utilizing flue gas drying and water recycling - Google Patents

Fan grinding hot blast powder feeding and pulverizing system utilizing flue gas drying and water recycling Download PDF

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CN102798133B
CN102798133B CN201110140836.8A CN201110140836A CN102798133B CN 102798133 B CN102798133 B CN 102798133B CN 201110140836 A CN201110140836 A CN 201110140836A CN 102798133 B CN102798133 B CN 102798133B
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coal
communicated
weary
drying
weary gas
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CN102798133A (en
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郭晓克
肖峰
施大钟
裴育峰
孙丰
施登宇
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中国电力工程顾问集团东北电力设计院
上海机易电站设备有限公司
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Abstract

The invention relates to a fan grinding hot blast powder feeding and pulverizing system utilizing flue gas drying and water recycling. The system is further provided with a steam exhaust separator, a pulverized fuel feeder and a coal-dust mixer in sequence between a tailing separator and a coal-dust distributor; the upper part of the steam exhaust separator is provided with a steam exhaust outlet; the steam exhaust outlet is communicated with a steam exhaust filter; the coal outlet of the steam exhaust filter is communicated with the pulverized fuel feeder; the air outlet of the steam exhaust separator is communicated with a steam exhaust fan; the steam exhaust fan is then communicated with a desulfurizing tower; and an air preheater is further communicated with the coal dust mixer. The system has the advantages of improving the burn-up quality of brown coal and the thermal efficiency of fuel coal, and as drying, pulverizing, upgrading, water conservation and storage of the brown coal are combined, the coal consumption of power generation can be reduced, and a large amount of water in the brown coal can be recycled.

Description

A kind of stove cigarette drying and Water Sproading fan mill pulverized coal carried by hot air pulverized coal preparation system
Technical field
The invention belongs to coal power generation technical field, relate to brown coal generation technology, say with having, relate to drying and the pulverized coal preparation system of brown coal.
Background technology
Brown coal, have another name called bavin coal, many in brown or brown-black, being the inferior fuel of a kind of high-volatile (about 50%), high moisture content (25%-60%), ash-rich (about 30%), low heat value (about 3200kcal/kg), low ash smelting point, cracked, the oxidizable spontaneous combustion of easy-weathering, is the pit coal that degree of coalification is minimum.Brown coal are mainly used in the fuel in power plant, also can make industrial chemicals, catalyst carrier, adsorbent, purify waste water and Footwall drift etc.Due to the restriction of natural quality and technical matters, comprise in exploitation, the subject matter that utilizes brown coal process to exist: (1) calorific value is low, and purposes is limited.Build coal-electricity base, utilize lignite resource to be a grand strategy of China's energy development.For Inner Mongol Huolin Gol, brown coal caloric value is substantially at about 3200kcal/kg, and the design of local boiler, owing to considering the characteristic of such coal, can be applied on the spot.Owing to having strict requirement to the caloric value of coal during most boiler design, if brown coal are transported to interior application by transport, then directly cannot burn, significantly limit the production capacity of brown coal; (2) not easily store transport, sell radius limited.Mainly concentrate on the ground such as the Inner Mongol, Yunnan and Heilungkiang due to China's lignite resource, and consumption of coal is mainly at the southeast.The amount transport of coal result in the anxiety of railway transportation capability, and brown coal height moisture content, is not suitable for long distance transportation in addition, and transportation radius is generally in 300 kms; (3) during brown coal burning, heat utilization efficiency is low, and dust discharge amount is large, and environmental pollution is serious.
Current brown coal drying and upgrading generally adopts hot-blast stove, roller drier.Drying machine flue gas is entrained with coal dust, and flue gas need emptying after cyclone separator, air-introduced machine, water scrubber.Due to the particularity of brown coal, and national without relevant criterion, specification to the design of brown coal drying, cause brown coal drying process Problems existing more.Brown coal drying and upgrading technology is exactly that it is dry on the spot, obtains the coal of golf calorific value.Brown coal (3200kcal/kg), remove after 20% moisture through super-dry, caloric value is about more than 4800kcal/kg, will double above through drying and upgrading brown coal value.Meanwhile, dried brown coal are advantageously in storage and transport.Brown coal drying and upgrading mainly contains fluid bed, rotary kiln, horizontal moving bed three kinds of technical matters.Drying medium mainly contains flue gas, water vapour etc.
From drying principles, there is maximization and fluidised form control problem in fluid bed drying process.Rotary kiln drying technique is one of technology of dry technology develop enterprise emphasis popularization both at home and abroad at present, but due to its restriction feeding air quantity and kiln body diameter, is difficult to carry out maximization application.Although domestic discrete units is for improving treating capacity at exploitation diameter 9 meters, the rotary drying device of long 80 meters, only rests on development at present, reduces investment still very arduous with the task of operating cost.
From drying medium, because brown coal are a kind of coals very easily separating out fugitive constituent, when adopting oxygen-containing gas dry, if there is the problems of excessive heat that local exothermic oxidation causes, easily cause fugitive constituent to burn, thus cause the combustion problem of drying system, the normal table of influential system runs.If when all adopting water vapour to carry out drying, due to the emission loss of latent heat, easily cause larger energy waste.Existing brown coal drying and upgrading technique many places are in scale demonstration phase, and stable operation problem is the one of the main reasons of these process scale of puzzlement application.
Brown coal are compared with bituminous coal, anthracite, and the advantage of brown coal is that price is lower, and reactivity is high, but its calorific value is relatively low, and water content is higher, is generally 25%-60%.Moisture in brown coal increases cost of transportation, affects boiler operatiopn, reduces power plant efficiency, increases greenhouse gas emission, and therefore the exploitation of brown coal drying and upgrading Technology and equipment is clean and effectively utilizes the key of brown coal.
The upgrading of brown coal refers to that brown coal change into the upgraded coal with bituminous coal character after at high temperature standing dehydration and thermal decomposition effect.Brown coal dehydration is except sloughing portion of water, and also along with the change of the Nomenclature Composition and Structure of Complexes of some coals, it is mainly caused by dehydration and process.So, the dehydration of the grading process of brown coal mainly brown coal.After dehydration, the moisture of brown coal and reactivity reduce, and caloric value improves, and after burning, the discharge of greenhouse gases reduces.If by brown coal 50% moisture removing, will make brown coal burn after produce greenhouse gas emissions reduce by 15%.Tested by reality and learn, the brown coal of a kind of moisture 42.52%, caloric value 11.93MJ/kg, after transformation dryness, moisture reduces to 14.43%, caloric value increases to 18.08MJ/kg, and be equivalent to calorific value and improve 51.6%, this is very huge beyond doubt on the impact of brown coal power plant.
And on the other hand, China's freshwater resources total amount is 28000 billion cubic meters, accounts for 6% of global water resources, occupy the 6th, the world, but only having 2400 cubic metres per capita, be only 1/4 of world average level, rank 121 in the world, is one of 13 countries that water resource is the poorest per capita in the whole world.To 20 end of the centurys, in more than 600 city, the whole nation, there is insufficient water problem in existing more than 400 city, wherein more serious lack of water city reaches 110, and National urban lack of water total amount is 60 billion cubic meters.China's shortage of water resources on the one hand, China's water utilization rate is low on the other hand.Calendar year 2001 China every ten thousand yuan of industrial output value water consumption are 90m 3left and right, is 3-7 times of developed country; Recycling rate of water used by the industries about 52%, far below the level of developed country 80%.
China's typical " rich coal lack of water " area in the area such as Inner Mongol that lignite resource is concentrated.A large amount of pit-head power station gathers underground water as power plant's moisturizing, makes Groundwater Resources Depletion, and meadow large area desertifies, and forms vicious circle in the course of time.Therefore; can develop in water-deficient area combustion lignite-fired unit a kind of in combustion brown coal process, the large water gaging in brown coal is separated after the novel water-saving technology of regeneration become the task of top priority; so both for power plant brings economic benefit, also to the improvement of the local ecosystem, there is very positive effect.
When brown coal are mainly used in the fuel in power plant, brown coal drying pulverized coal preparation system primary structure more advanced both at home and abroad as depicted in figs. 1 and 2.
Fig. 1 is three media (high-temperature flue gas, hot-air and low-temperature furnace smoke) brown coal drying pulverized coal preparation system.Within the system, high-temperature flue gas extracts in boiler 13 upper furnace, about 1100 DEG C; Low-temperature flue gas by air-introduced machine 17 take out electric cleaner 18 of hanging oneself process after flue in flue gas about 130 DEG C (remaining partial fume discharge through chimney 19); High-temperature flue gas, low-temperature flue gas and hot blast 3 kinds of media are delivered to coal pulverizer 5 as drier by high-temperature furnace smoke pipeline 16 after mixing chamber 15 mixes.At the brown coal in run coal bin 1 after automatic balance 2 measures, then enter descending drying tube 4 via feeder 3.Brown coal enter coal pulverizer 5 be mixed to get preliminarily dried with high temperature drying agent in descending drying tube 4 after.Further drying is obtained in the process that brown coal are broken in coal pulverizer 5.The mill separator 6 that coal pulverizer 5 exports is sent thick pulverized coal particle back to coal pulverizer 5 and is continued to grind, and coal dust and weary gas are transported to burner 8 through pulverized coal distributor 7 and enter hearth combustion.The generation of hot blast is produced by pressure fan 9, and the air preheater 10 through being arranged in flue carries out preheating, and the hot blast after preheating divides two-way, and a road enters mixing chamber as a hot blast, and another road enters burner 8 as secondary hot-air and carries out combustion-supporting.In this stove cigarette drying and Water Sproading fan mill pulverized coal carried by hot air pulverized coal preparation system, three medium systems are adopted to have the following advantages: 1) the dry dry demand by regulating cold and hot exhaust gas volumn to adapt to the different operating mode of coal pulverizer of three media, hot blast rate can be kept constant, be conducive to fuel and burn under optimum condition.2) admix cold flue gas and can ensure CO in pulverized coal preparation system drier 2content is greater than 4%, but also often has the danger of blasting by this pulverized coal preparation system of the factors such as pipeline leaks out.Cold smoke passes into cold smoke when stopping mill in coal pulverizer can make hot coal pulverizer coasting operation, not only can blow out remaining powder but also can cool coal pulverizer.3) flexible adjustment, reliable.4) burner region temperature levels can be reduced, reduce or avoid, in burner hearth, slagging scorification occurs, and can NO be reduced xgeneration.
Fig. 2 is second medium (high-temperature flue gas, hot-air) brown coal drying pulverized coal preparation system, has lacked the pipeline generating cold smoke compared with three medium brown coal drying pulverized coal preparation systems shown in this system with Fig. 1.Within the system, coal pulverizer 5, from the high-temperature flue gas of the upper furnace suction about 1100 DEG C of boiler 13, enters descending drying tube 4 after mixing, carry out predrying within it to coal breakage with the hot-air generated through pressure fan 9, air preheater 10.After the mixture of drier (i.e. the mist of high-temperature flue gas and hot-air) and coal enters coal pulverizer 5, fuel obtains further drying grinding in process.Desiccant mixture is sent into mill separator 6 by the pressure head that coal pulverizer produces, and meal returns coal pulverizer 5 and ground again, and coal dust is then sent in burner 8 by weary gas.
Above-mentioned two kinds of brown coal drying pulverized coal preparation systems are all strengthened drying and ensure fuel stabilization burning aspect, but all a large amount of water vapours evaporated in brown coal drying process can be sent into burner hearth, this makes fire box temperature reduce on the one hand, add the Coal-fired capacity of burner hearth, add the heating surface of boiler simultaneously, boiler using brown coal cost is obviously increased, and the combustion mark coal burning boiler of 600MW cost compared with a same combustion boiler using brown coal differs 200,000,000 yuans nearly.Also make heat loss due to exhaust gas increase on the other hand, boiler thermal output reduces.
Current power station brown coal drying pulverized coal preparation system is all conceived to drying to brown coal and powder process, and the water in brown coal enters burner hearth with weary gas after becoming steam in the lump.And brown coal upgrading, bring a large amount of problem such as the storage after brown coal upgrading, packaging, transport, spontaneous combustion, environmental pollution equally, and invest huge.And it fails to make overall plans with the brown coal pulverized coal preparation system of power plant, make all kinds of brown coal upgrading technical costs comparatively large, all can not apply.
Summary of the invention
Technical problem to be solved by this invention is to provide one and can either improves brown coal burnup quality thus strengthen coal fuel heating efficiency, brown coal drying, powder process, upgrading, water saving, accumulating etc. are given altogether, gross coal consumption rate can be reduced, the stove cigarette drying that a large amount of Water Sproading in brown coal can be utilized again and Water Sproading fan mill pulverized coal carried by hot air pulverized coal preparation system.This system by combustion brown coal power plant dry powder process combine with brown coal upgrading, obviously can reduce boiler volume and manufacturing cost becomes original brown coal stove into bituminous coal stove, simultaneously to overcome the deficiency of existing independently brown coal drying powder-making technique system and independently brown coal drying and upgrading technological system existence.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of stove cigarette drying and Water Sproading fan mill pulverized coal carried by hot air pulverized coal preparation system, comprise the run coal bin being connected in series connection successively, descending drying tube, blower mill, mill separator, pulverized coal distributor, described coal dust classifier is communicated with the burner of boiler again, also comprise mixing chamber, this mixing chamber first air inlet and the second air inlet are communicated with smoking mouth and the cold smoke blower fan of boiler respectively, what described cold smoke blower fan was communicated with boiler is provided with flue tail flue gas dust removal device, the gas outlet of described mixing chamber is communicated with descending drying tube again, described boiler flue is other is provided with pressure fan, this pressure fan is communicated with the air preheater be located in flue, it is characterized in that: between described mill separator and pulverized coal distributor, be also provided with weary gas separating device successively, machine supplying powder and coal, pulverulent fuel mixer, described weary gas separating device top has the outlet of weary gas, the weary air filter of this weary gas outlet, the coal outlet of described weary air filter is communicated with machine supplying powder again, the gas outlet of weary gas separating device is communicated with a weary gas blower fan, this weary gas blower fan is communicated with desulfurizing tower again, described air preheater is also communicated with coal, pulverulent fuel mixer.
Adopt technique scheme, increase and have weary gas separating device, powder feeding machine, coal, pulverulent fuel mixer, so weary gas and a small amount of coal dust will be separated from weary gas separating device and filter through weary air filter, filter section coal dust kept off and then can flow down powder feeding machine from coal outlet, coal dust and dried brown coal are together being sent into coal, pulverulent fuel mixer and together entering burner under hot wind actions by powder feeding machine, and the weary gas not containing coal dust after filtering enters desulfurizing tower and processes under the traction of weary gas blower fan.
At native system, because the weary gas including steam produced together does not enter burner hearth in company with dried brown coal, in-furnace temperature can be made to raise, contribute to improving fuel economy, the heating surface area of boiler can be reduced, can obviously lower boiler volume and manufacturing cost.In addition, high-temperature flue gas and cold smoke (in the present invention, second medium does not get rid of moderate oven cigarette and cold smoke, moderate oven cigarette and hot blast, high-temperature flue gas and hot blast) is only adopted to carry out drying as drier to brown coal in the present invention, and in drier, do not mix hot blast, at this moment hot blast oxygen content is higher, easily causes deflagration accident having.Dry and the Water Sproading fan mill pulverized coal carried by hot air pulverized coal preparation system high-temperature flue gas of stove cigarette and cold smoke very low as its oxygen content of drier, doing so avoids the generation of brown coal deflagration accident having in dry shattering process.In addition, dried brown coal are sent into burner by the present invention's hot blast, suitably can improve the outlet temperature after coal pulverizer on the one hand, significantly can improve the flammability of fuel like this, boiler low load stable combustion performance enhancement, has enough hot-airs when ensureing boiler combustion on the other hand.
In addition, in further improvement of the present invention, between described weary gas blower fan and desulfurizing tower, be also provided with weary Gas Cooler.Weary Gas Cooler on the one hand can by water vapour in weary gas in addition cold doubt after become Water Sproading and utilize, Water of Power Plant system can also be sent into after cooling water heating, the flue gas after dehydration is entered desulfurizing tower of electric power plant process.Like this water gaging large in brown coal to be collected, then can as the moisturizing of power plant after waste water unit process, again can by the recovery in addition of the heat in weary gas.Therefore the dry and Water Sproading fan mill pulverized coal carried by hot air pulverized coal preparation system technology of stove cigarette has the comprehensive advantage of energy-conservation, water saving, environmental protection, great especially to water-deficient area meaning.
Accompanying drawing explanation
Fig. 1 is three medium brown coal drying pulverized coal preparation system structural representations in prior art;
Fig. 2 is second medium brown coal drying pulverized coal preparation system structural representation in prior art;
Fig. 3 is three drying of medium stove cigarettes and Water Sproading fan mill pulverized coal carried by hot air pulverized coal preparation system structural representations of the present utility model.
Detailed description of the invention
As shown in Figure 3, in three medium stove cigarettes dryings of the present utility model and Water Sproading fan mill pulverized coal carried by hot air pulverized coal preparation system, run coal bin 1 is connected to automatic balance 2, automatic balance 2 connects feeder 3 again, feeder 3 connects descending drying tube 4 again, descending drying tube 4 connects blower mill 5 again, blower mill 5 connects mill separator 6 again, mill separator connects weary gas separating device 22, weary gas separating device 22 is communicated with powder feeding machine 24 again, powder feeding machine 24 connects coal, pulverulent fuel mixer 25 again, coal, pulverulent fuel mixer 25 connects pulverized coal distributor 7 again, pulverized coal distributor 7 finally connects the burner 8 of boiler 13.The upper furnace of boiler 13 has smoking mouth 14, and this smoking mouth 14 is communicated to the first air inlet of mixing chamber 15.The middle part flue of boiler 13 is other is provided with pressure fan 9, and this pressure fan 9 is communicated in the air preheater 10 in flue, and 10 points, this air preheater is by hot air duct 11 two-way, and a road is communicated to burner 8 through secondary air box 12, and another road is then communicated with coal, pulverulent fuel mixer 25.Smoke duster 17 is also provided with at the flue afterbody of boiler 13, this smoke duster 17 is connected with air-introduced machine 18, this air-introduced machine 18 points of two-way, and a road is communicated to chimney 19, another road is communicated with a cold smoke blower fan 20, and this cold smoke blower fan 20 is communicated to the second air inlet of mixing chamber 15 again.The gas outlet of mixing chamber 15 is communicated to descending drying tube 4 by high-temperature furnace smoke pipeline 16.The outlet of weary gas is had on the top of weary gas separating device 22, the weary air filter 27 of this weary gas outlet, the coal outlet of weary air filter 27 is communicated with powder feeding machine 24 again, the gas outlet of weary air filter 27 connects a weary gas blower fan 37, and this weary gas blower fan 37 is communicated with desulfurizing tower through weary Gas Cooler 30 or without weary Gas Cooler 30 again.Coal pulverizer 5 adopts blower mill.
This stove cigarette operation principle that is dry and Water Sproading fan mill pulverized coal carried by hot air pulverized coal preparation system is:
Raw coal claims to fall into descending drying tube 4 by feeder 3 after 2 meterings through run coal bin 1 to automatic scales, and mixes with the second medium hypoxemia drier be made up of high-temperature flue gas and cold smoke.
About 1100 DEG C of high-temperature flue gas extract at the smoking mouth 14 on boiler furnace top, stokehold is delivered to after about 130 DEG C of cold smokes take from boiler tail flue gas dust removal device 17 and air-introduced machine 18 via cold smoke blower fan 20 and cold smoke pipeline 21, the two is mixed into the drier with certain just gentle flow at mixing chamber 15, drier is delivered to descending drying tube 4 by film high-temp. stove pipe road 16.
Raw coal mixes with about 800 DEG C of high temperature drying agent and after completing preliminarily dried, enters blower mill 5 in descending drying tube 4.Raw coal is fractured into coal dust in blower mill 5, simultaneously also dried dose of drying further, and blower mill 5 exports coal dust moisture about 5%, wind powder mixture temperature about 180 DEG C ~ 220 DEG C.The wind powder mixture that blower mill 5 is sent enters blower mill 5 and exports the mill separator 6 arranged, mill separator 6 is sent thick pulverized coal particle back to blower mill 5 and is continued to grind, qualified coal dust and weary gas (temperature reduction and drying capacity reduce after drier be called weary gas) enter weary gas separating device 22 and carry out gas solid separation.The isolated coal dust of weary gas separating device 22 falls into Pulverized Coal Bin 23 and sends into pulverized coal carried by hot air pipeline via machine supplying powder 24 by coal, pulverulent fuel mixer 25 again; Coal dust is sent to burner 8 through coal, pulverulent fuel mixer 25 and pulverized coal distributor 7 by hot blast.
The isolated coal dust of weary gas separating device 22 directly sends into pulverized coal carried by hot air pipeline via machine supplying powder 24 by coal, pulverulent fuel mixer 25, and coal dust is sent to burner 8 through coal, pulverulent fuel mixer 25 and pulverized coal distributor 7 by hot blast.
The isolated weary gas containing a small amount of fine powder of weary gas separating device 22 reclaims fine powder by sending into weary air filter 27 containing milling waste steam pipeline 26, the fine powder that weary air filter 27 reclaims is sent back in the pulverized coal flow of weary gas separating device 22 outlet by packing auger 32 via pulverized coal feed pipe 33, directly send into pulverized coal carried by hot air pipeline via machine supplying powder 24 by coal, pulverulent fuel mixer 25, coal dust is sent to boiler-burner 8 through coal, pulverulent fuel mixer 25 and pulverized coal distributor 7 by hot blast.
The weary gas of weary air filter 27 weary gas outlet is recovered as in the weary Gas Cooler 30 of one via blast pipe road 29 feeding collection waste heat recovery and moisture by weary gas blower fan 28.A large amount of water vapours contained in weary gas become liquid condensate water after weary Gas Cooler 30 cools, condensate water gives reuse by water treatment, the waste heat that in weary Gas Cooler 30, cooling water reclaims can return Water of Power Plant system and be utilized, and the low temperature waste gas that weary Gas Cooler 30 exports is sent into desulfurizing tower and discharged after purified treatment together with boiler exhaust gas.
If when not arranging that weary Gas Cooler 30 or the weary Gas Cooler 30 arranged need overhaul, weary gas directly can be sent to desulfurizing tower via cooler bypass duct 31 by blast pipe road 29.
In air flow process, cold air sends into air preheater 10 by pressure fan 9 is become hot-air by flue gas to uniform temperature, hot-air is carried by hot air duct 11 and is divided into two-way, coal dust is sent to boiler-burner 8 as First air through coal, pulverulent fuel mixer 25 and pulverized coal distributor 7 by one tunnel, another road is also sent to burner 8 as Secondary Air after secondary air bellow 12 distributes, the two is mixed in stove by burner 8, makes fuel stabilization efficient burning.
Within the system, drier flows through the resistance that the resistance of high-temperature furnace smoke pipeline 16 and descending drying tube 4 and wind powder mixture flow through mill separator 6 and weary gas separating device 22 and is provided by the lifting pressure head of blower mill 5 self, and weary air-flow is provided by weary gas blower fan with the resistance of weary Gas Cooler 30 and corresponding pipeline through weary air filter 27.
Brown coal high temperature flue gas drying, powder process, dehydration, directly burning combine by native system, pulverizing process is made to achieve zero-emission, have the function of water saving, energy-conservation, economy and environmental protection, the powder-making technique achieved in brown coal drying shattering process combines with upgrading technology.This efficient brown coal upgrading pulverized coal preparation system patent has following characteristics:
(1) 30% is adapted to the brown coal low-calorie inferior of moisture;
(2) drying of stove cigarette and Water Sproading fan mill pulverized coal carried by hot air pulverized coal preparation system adopt high-temperature flue gas and cold smoke as drier, and carry out drying to brown coal, and mix hot blast as drier, the oxygen content in drying is higher, therefore, often causes deflagration accident having.Native system adopt high-temperature flue gas and cold smoke extremely low as drier oxygen content, avoid the generation of the deflagration accident having in dry shattering process.
(3) native system adopts the pulverized coal carried by hot air technology after weary gas separating device, therefore, suitably can improve the outlet temperature after blower mill, significantly can improve the flammability of fuel like this, boiler low load stable combustion performance enhancement, the combustion-supporting oil of a large amount of underload can be saved or do not throw oil and run, also make boiler oil adaptability strengthen, the young brown coal that burning calorific value is lower simultaneously.
(4) native system avoids a large amount of problem such as other storage of brown coal upgrading technology, packaging, transport, spontaneous combustion, environmental pollution etc., combines with the pulverized coal preparation system of power plant.
(5) moisture of 95% in native system brown coal can not enter burner hearth, fire box temperature is improved, this is conducive to fuel after-flame on the one hand thus improves fuel economy, according to measuring and calculating, the brown coal of a kind of moisture 42.52%, caloric value 11.93MJ/kg, after transformation dryness, moisture reduces to 14.43%, caloric value increases to 18.08MJ/kg, is equivalent to calorific value and improves 51.6%.For Inner Mongol coal price in 2009, brown coal (3200kcal/kg) near coal-mine valency is about 70 yuan/ton, and remove after 20% moisture through super-dry, caloric value is about more than 4800kcal/kg, and boiler efficiency can reach more than 95%.Also make the required corresponding minimizing of heating surface in stove on the other hand, therefore it is boiler dedicated standard bituminous coal fired boiler can be adopted to substitute former brown coal in combustion brown coal power plant design, the boiler investment as a 600MW can reduce about 200,000,000 yuan nearly, thus obviously reduces power plant's initial cost;
(6) native system, in weary gas, environmentally harmful flammable fugitive constituent gas sends into hearth combustion, both improves fuel availability thus, it also avoid weary gas and directly enter the severe contamination of air to environment; To flammable in weary gas fugitive constituent gas less there is no fuel value, by directly entering desulfurizing tower process after heat exchange, with protection of the environment.
(7) 95% moisture in native system brown coal enters weary Gas Cooler with Properties of Steam with weary gas, reclaimed through weary Gas Cooler cooling condensation, as invested the brown unit of 2*600MW, every platform use coal per hour 400 tons of meters, the total moisture of brown coal is 40%, and the water of recyclable more than 2,800,000 tons, can save a large amount of power-plant makeup thus, there is significant water-saving benefit, be especially applicable to the national conditions that China's brown coal place of production mostly is water-deficient area;
(8) the weary Gas Cooler of native system is not only economized on water, and also makes the latent heat of condensation of large quantity of moisture in weary gas be reclaimed and returns the Water of Power Plant circulatory system simultaneously, thus the gross coal consumption rate of brown coal power plant is minimized, having significant economic benefit.
(9) native system adopts the coal pulverizer structure of fan type, and it is disintegrating machine, is again air blast, or drying machine.
(10) native system adopts high water content brown coal, carries out predrying before coal pulverizer, improves brown coal mill drying capacity.
(11) native system is after raw coal automatic Weighing, and in feeder defeated coal process, give one is that temperature is carried out predrying.
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 (3)

1. the drying of stove cigarette and a Water Sproading fan mill pulverized coal carried by hot air pulverized coal preparation system, comprise boiler, be connected in series the run coal bin of connection, descending drying tube, blower mill, mill separator successively, pulverized coal distributor, described coal dust classifier is communicated with the burner of boiler again, also comprise mixing chamber, this mixing chamber first air inlet and the second air inlet are communicated with smoking mouth and the cold smoke blower fan of boiler respectively, what described cold smoke blower fan was communicated with boiler is located at flue tail flue gas dust removal device, the gas outlet of described mixing chamber is communicated with descending drying tube again, described boiler flue is other is provided with pressure fan, this pressure fan is communicated with the air preheater be located in flue, it is characterized in that: between described mill separator and pulverized coal distributor, be also provided with weary gas separating device successively, machine supplying powder and coal, pulverulent fuel mixer, described weary gas separating device top has the outlet of weary gas, the weary air filter of this weary gas outlet, the coal outlet of described weary air filter is communicated with machine supplying powder again through packing auger, the gas outlet of weary gas separating device is communicated with a weary gas blower fan, this weary gas blower fan is communicated with desulfurizing tower again, described air preheater is also communicated with coal, pulverulent fuel mixer.
2. stove cigarette drying according to claim 1 and Water Sproading fan mill pulverized coal carried by hot air pulverized coal preparation system, is characterized in that: be also provided with weary Gas Cooler between described weary gas blower fan and desulfurizing tower.
3. stove cigarette drying according to claim 2 and Water Sproading fan mill pulverized coal carried by hot air pulverized coal preparation system, is characterized in that: be provided with deduster between described weary gas separating device and described weary Gas Cooler.
CN201110140836.8A 2011-05-27 2011-05-27 Fan grinding hot blast powder feeding and pulverizing system utilizing flue gas drying and water recycling CN102798133B (en)

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