CN206019257U - The system that a kind of coal drying controls oxygen concentration - Google Patents

The system that a kind of coal drying controls oxygen concentration Download PDF

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Publication number
CN206019257U
CN206019257U CN201620679896.5U CN201620679896U CN206019257U CN 206019257 U CN206019257 U CN 206019257U CN 201620679896 U CN201620679896 U CN 201620679896U CN 206019257 U CN206019257 U CN 206019257U
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coal
air
exsiccator
flue gas
oxygen concentration
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李功民
杨宝祥
李志明
王旭哲
梁大伟
刘呈兵
吕春晓
李绍川
解江华
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Tangshan Shenzhou Machinery Group Co.,Ltd.
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Tangshan Shenzhou Machinery Co Ltd
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Abstract

The utility model discloses the system that a kind of coal drying controls oxygen concentration,The system includes Pulverized Coal Bin (101)、Coal-powder boiler expansion chamber (104)、Heat exchanger (109)、Lump coal exsiccator (202)、Smalls exsiccator (302)、Sack cleaner (401) and air-introduced machine (405),Through exsiccator (lump coal exsiccator (202)、Smalls exsiccator (302)) tail gas by the gravitation of air-introduced machine (405) by pipeline suction sack cleaner (401),Coal dust in tail gas is located in Pulverized Coal Bin (101) of cleaner unit (401) coal powder conveyer (403) below by Pipeline transport to pulverized coal injection blown converter,Coal dust in Pulverized Coal Bin (101) is produced high warm flue gas by high pressure positive blower and burner noz(zle) (102) spirt pulverized coal hot air furnace (103) burning.Which achieves the reasonable utilization of dry run side-product coal dust, and the abundant thermal efficiency of fuel combustion is high, and air stove configuration power is little.

Description

The system that a kind of coal drying controls oxygen concentration
Technical field
This utility model belongs to dry method ore dressing field, and in particular to the system that a kind of coal drying controls oxygen concentration, which is adopted Heat exchange cooling and two sets of drying devices are carried out to dry thermal medium gas with heat exchanger is carried out respectively to varigrained coal Dry, which is particularly well-suited to the drying of coal, for reducing the content of coal moisture before combustion.
Background technology
As us as you know, electric power has been necessary to mankind's daily life, from illumination to TV, computer, Refrigerator etc..The goods and materials data that we are obtained in living almost 100% is obtained by power generation processing, in China's electric power Produce nearly 60-70% to obtain by burning coal.These coals generally have four types:Anthracite, bituminous coal, long bituminous coal and Brown coal.Although these four coals all contain charcoal, hydrogen, nitrogen, oxygen, sulfur and moisture, these four solid state components and moisture containing quantitative change Change huge.Such as senior anthracite carbon content up to more than 90%, and rudimentary brown coal are 30% or so, and moisture is in anthracite and cigarette Only 1% in coal, long bituminous coal is in 25-30%, and general in 30-40% in brown coal, some areas up to 50-60%, relative In bituminous coal and anthracite brown coal, long bituminous coal and brown coal have relatively low calorific value, and reason is that they produce less heat in burning. High moisture content causes substantial amounts of ineffective traffic when also resulting in long-distance transportation.Coal in China in 2015 is consumed total consumption and will be broken through 4000000000 tons, at present, the high-quality coal resource such as bituminous coal, anthracite is fully utilized, is expanded space limited, the storage that China's brown coal are verified Amount accounts for the 13-15% of national coal reserves up to 130,000,000,000 tons, separately has 190,000,000,000 tons of prognostic resources, and resource distribution is relative to collect In in northeastern Inner Mongolia and Yunnan Province.Brown coal degree of coalification is low, moisture is high, volatile matters are high, calorific value is low, directly as power plant Fuel and industrial chemicals have significant limitation, and place of production utilization rate is low, and when transporting outward over long distances, transport high cost causes economic benefit Difference.For this purpose, the upgrading technology of the low-order coal effectively utilizes such as research and development brown coal, solves the pass for troubling China's brown coal large-scale development Key technology, makes brown coal play its due energy source contribution, there is weight to supporting China's economy and the social development in brown coal preservation area Want meaning.
Have very multiple exsiccators in the prior art to dry coal, such as fluidized bed steam dry technology.In stream Change in bed dryer, steam not only serves as dried medium but also as fluidizing agent.Therefore, the steam for drying evaporation is not Containing air and other debris, can by the following method further with.Moisture such as evaporation is situated between through being recycled as fluidisation Matter enters fluid bed, the latent heat of vaporization that is released when being condensed using it, and it is collapsed into superheated steam.Superheated steam is by height Moisture coal stream blows to ebullated bed top from the bottom of drying machine and produces fluidisation phenomenon.Vapor adsorption coal raw coal in fluid bed In the moisture that evaporates, raw coal enters through cyclone separator from the top input of drying machine, and steam is partly led back to drying again Machine.Energy needed for drying machine is provided by the steam from steam turbine out.Concrete technology flow process is as shown in Figure 3.
Steam air combined drying technology, this method be burn U.S. Fen He basins coal power plant in for developing in recent years Integrated dry technology is planted, concrete technology flow process is as shown in Figure 4.It makees dried medium using the hot water from condenser out, although Hot water drying is poorer on rate of drying and degree than superheat steam drying, but hot water is a kind of " used heat " for power plant, Also need to using cooling tower cooler.Air is heated to the fluidizing agent after 43 DEG C as fluidized bed dryer by heat recirculated water, with When 49 DEG C hot water as fluid bed drying source medium.Result of the test shows, after reduced by as-fired coal moisture, Efficiency is greatly improved, CO2、SO2Discharge decline substantially.As a example by testing power plant, moisture is reduced to 31.4% from 37.5%, boiler Net efficiency improves 2.6%, and fuel consumption reduces 10.8%, and exhaust gas volumn reduces by 4%;Carry with grindability as coal flow is reduced Height, coal pulverizer lower power consumption 17%;Blower fan lower power consumption 3.8%.Totally counting, station service power consumption rate reduces 3.8%, and effect shows Write.
Drum-type drying technology, its drying and dehydrating technical matters flow process are shown in Fig. 5.Cylindrical drier is adopted with its auxiliary facility Convective heat exchange mode is used, and makes the overall process " sealing feed, drying and dehydrating, sealing discharging " of coal drying all master be dried at one Complete on machine.It is coal raw coal that drying is fuel used.Cylinder dry technology carries out convection drying using high-temperature flue gas, unavoidably There are the volatile matters such as CO to produce, further, since controllability is poor, it is difficult to maximize, therefore, raw coal cylinder dry project application is less Risk is big.
There are a manifold system, drum body to assume heeling condition in drum shaped body as shown in Figure 6.Raw coal is continuously from upper Side is sent in drying machine pipe, and when drum body rotates, coal is ceaselessly transported to outlet.Heat needed for moisture drying is by manifold system Interior low-pressure steam is provided, and low-pressure steam is axially into inside and rapid to tube outer surface diffusion along drum body.With coal together The air entered in body, after absorbing moisture, separates with dry pulverized coal in cleaner unit, and a part re-compresses entrance drying Machine, another part are just discharged into air.
Existing patent application ZL98251141.8 requires that wet stock must all by each layer of bed body in exsiccator, this The necessary granule size of sample wet stock is consistent, has larger discrepancy with the brown coal for drying 0-50mm granularities.Existing patent application ZL88219014.8 be monolayer vibrated fluidized bed, its structure be mainly upper shell participate in vibrating together with vibrated bed, it is impossible to realize The drying of high throughput dries the difference for having essence with the vibrating mixed flow of multilamellar.
Patent application " a kind of method of oxygen concentration in exsiccator of reduction coal drying system " is to reduce oxygen content Method, its exiting flue gas to vibrating mixed flow dryer carry out heat exchange process, reduce flue-gas temperature;Which passes through to reducing flue gas temperature The flue gas of degree is mixed with the high-temperature flue gas of air stove again, circulates the mesh for reducing oxygen content by repetitious , the method reduction oxygen content is limited, because the cooled flue gas for looping back need to consume substantial amounts of energy in cooling procedure, And the circulating flue gas water capacity for cooling down is 100%, when cooling air quantity is less, the amplitude of Control for Oxygen Content is limited, when cold But when air quantity is larger, due to the increase of water capacity, it has to improve the temperature of aerofluxuss to ensure the operation safety of cleaner unit, do not have The raising for improving heat exchange efficiency is reached, through Theoretical Calculation, its oxygen content is at least more than 15%.
Existing dry technology described above, or using all under very high pressure and temperature, high equipment cost, needs Huge energy expenditure and running cost is wanted, or need steam to be combined with power plant can just realize.Adopt high-temperature flue gas Drying brown coal, damages the volatile matters of coal, causes dry run safety cannot be guaranteed when drying.
Utility model content
In order to solve problems of the prior art, the present inventor puts into substantial contribution, studies through for many years, proposes one Plant the system that coal drying controls oxygen concentration.This utility model is conducted to the high-temperature flue gas of air stove using pipe heat exchanger Heat exchange and the pulverized coal as fuel that is collected using dry cloth bag dust-precipitator in dry run, using pulverized coal injection blown converter, are realized dry The reasonable utilization of dry process by-products coal dust, the abundant thermal efficiency of fuel combustion are high, and air stove configuration power is little.
According to the technical solution of the utility model, there is provided the system that a kind of coal drying controls oxygen concentration, which includes coal dust Storehouse 101, coal-powder boiler expansion chamber 104, heat exchanger 109, lump coal exsiccator 202, smalls exsiccator 302, sack cleaner 401 and draw Blower fan 405, it is characterised in that drawn by air-introduced machine 405 through exsiccator (lump coal exsiccator 202, smalls exsiccator 302) tail gas Power is by, in pipeline suction sack cleaner 401, the coal dust in tail gas is by the coal powder conveyer 403 below cleaner unit 401 In Pulverized Coal Bin 101 by Pipeline transport to pulverized coal injection blown converter, the coal dust in Pulverized Coal Bin 101 is by high pressure positive blower and burner noz(zle) The burning of 102 spirt pulverized coal hot air furnace 103 produces high warm flue gas.
Wherein, the coal dust in 103 combusting coal fines storehouse 101 of pulverized coal hot air furnace produces high warm flue gas, and this coal dust is received for cloth bag The coal dust that dirt device 401 is collected.After the high warm flue gas are through the sedimentation burning of air stove expansion chamber 104, pure high warm flue gas are passed through High-temperature flue gas pipeline 107 enters the high-temperature flue gas room 108 of heat exchanger 109.
Further, be provided with the top of air stove expansion chamber 104 connect with high-temperature flue gas pipeline 107 with air-valve 105. Heat exchanger bottom is provided with normal temperature air import 111.Portion is provided with hot-air air outlet 112 on heat exchangers.
Compared to existing technology, the method and system of control oxygen concentration provided by the utility model, can overcome existing The moisture content of heat smoke in technology, and lower oxygen content, carry out the dry of low humidity for the smalls for controlling oxygen concentration is needed Dry, it is dried using the air of low humidity for oxygen concentration lump coal need not be controlled, it is achieved thereby that the higher thermal efficiency Essential safety with dry run.During drying, dry tail gas and usually contain the less coal dust of a part of granularity, pass through The sack cleaner of system configuration is collected, and exports Pulverized Coal Bin, and preferential employing breeze blowing air stove ensure that environment Quality, it is not necessary to pulverizing, burn again more difficult transport airborne dust coal dust, breeze blowing air stove be present combustion efficiency highest, It is the type of furnace that consumption electric power is minimum.
Description of the drawings
Fig. 1 is the system structure schematic front view for controlling oxygen concentration according to coal drying of the present utility model;
Fig. 2 is the structural representation of the heat exchanger used in Fig. 1;
Fig. 3 is the schematic diagram that existing fluidized-bed coal is dried;
Fig. 4 is existing steam air combined drying process schematic representation;
Fig. 5 is existing drum-type drying process schematic representation;
Fig. 6 is existing steam pipe type drying process schematic diagram.
Specific embodiment
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the present utility model, rather than all Embodiment.Embodiment in based on this utility model, those of ordinary skill in the art are not making creative work premise Lower obtained every other embodiment, belongs to the scope of this utility model protection.
The characteristics of coal drying has its own compared with unclassified stores drying, one is that raw meal particle size changes greatly, from 0 to 50mm Each granularity has.The volume of dry materials dewatering time and material is directly proportional, the coal diameter phase of the coal of 0.5mm and 50mm 100 times are differed from, volume differs 1000000 (1,000,000) times.This requires that the coal of different grain size scope has different drying times, Coal granularity is longer for bigger drying time.Coal granularity is shorter for less drying time, needs dry temperature also lower.Generally 0- Coal between 1mm is directly taken out of exsiccator by 60 DEG C or so of the thermal medium gas that dries after the top pan feeding of exsiccator.Its His each granularity coal in exsiccator each layer by adjusting the diameter of sieve aperture so that each granularity coal have direct be sieved to reach under Layer sieve, had is directed through multi-deck screen, and had must progressively dry on each layer sieve, and so allowing for different grain size coal has not Same drying time, reach each particle size fraction coal drying and dewatering essentially identical.Two be coal drying due to have coal dust presence just There is the probability of detonation, it is ensured that the safety of coal drying is exactly the focus technology innovative point of present patent application.According to national phase Pass standard coal dust explosion must be provided simultaneously with three below condition, and 1. coal dust must have explosivity;2. coal dust is in atmosphere Suspended state, and (concentration limits of 0.75mm coal dusts are 50-2000g/m to reach certain concentration3);3. there is the high temperature of ignition Thermal source (700-800 DEG C).Present patent application dries coal using adverse current low temperature Wind Volume, that is, dry thermal medium gas and drying Low temperature of the general temperature below 250 DEG C during coal, and the bottom air feed from exsiccator, from the top air-out of exsiccator, coal Add from the top of exsiccator, coal down trickle down from the top of exsiccator or big particle diameter coal along vibrated bed from one layer one of top Layer down successively moves to exsiccator bottom, so thermal medium gas and coal stream are counter-current drying on the contrary, using Wind Volume is exactly Ensure the top in exsiccator, the coal dust of 0-1mm is directly dried thermal medium gas and takes exsiccator out of, in exsiccator top layer Dry thermal medium gas temperature and be reduced to 60 DEG C or so, the coal dust of 0-1mm is by 60 DEG C of gas drying.And ensure on exsiccator top Lower limit of the concentration of layer coal dust less than safe concentration, generally no greater than 30g/m3, the concentration of other each layer coal dusts is in safety Under several orders of magnitude of concentration value lower limit, in exsiccator, each section wind speed is higher, is also not in the coal dust of suspended state. Also there is no the high temperature heat source for igniting coal dust in the top layer of exsiccator, destroy two conditions of coal dust explosion, this is specially Profit application is safe when coal is dried.
A kind of this utility model and existing patent application " side of oxygen concentration in exsiccator of reduction coal drying system Method " also has larger difference in principle, and its distinctive points is mainly reflected in following innovative points.
The innovative point 1 of this technology utility model, mainly uses pipe heat exchanger and the high-temperature flue gas of air stove is passed Heat exchange is led, the Cryogenic air after heat exchange, water capacity are low, there can be relatively low delivery temperature, efficiency of utilization is high, and lump coal is carried out Dry, the Cryogenic air of Wind Volume is dried to the lump coal without coal dust, safe.Carry out after conduction heat exchange through pipe heat exchanger High-temperature flue gas be converted into middle low temperature heat smoke, then mix with a small amount of air, it is possible to obtain low temperature, hypoxia, low humidity Thermal medium gas is dried, the flue gas oxygen content can be controlled.Generally in raw coal, the quality of fine coal is not high, by block, smalls point Come drying, it is possible to realize that the heat smoke of 10%-14% oxygen content is dried to smalls, ensureing that coal powder density is not exceeded On the basis of standard, realize that hypoxia is dried.Reach the essential safety of drying process.
The innovative point 2 of this technology utility model, is made using the coal dust that dry cloth bag dust-precipitator in dry run is collected Fuel, using pulverized coal injection blown converter, realizes the reasonable utilization of dry run side-product coal dust, and the abundant thermal efficiency of fuel combustion is high, heat Wind furnace configuration power is little.
The system structure schematic front view of coal drying control oxygen concentration as shown in Figures 1 and 2 and the knot of heat exchanger Structure schematic diagram, wherein reference are specially:
103 pulverized coal hot air furnace of 101 Pulverized Coal Bin, 102 high pressure positive blower and burner noz(zle)
106 dump chimney of air-valve matched somebody with somebody by 104 coal-powder boiler expansion chambers 105
107 high-temperature flue gas pipeline, 108 heat exchanger high-temperature flue gas room, 109 heat exchanger
110 111 normal temperature air air inlet of heat exchanger low-temperature flue gas room, 112 hot-air air outlet
201 lump coal hot-air blower, 202 lump coal exsiccator, 301 smalls hot-air blower
302 smalls exsiccator, 401 sack cleaner, 402 sack cleaner air inlet
403 coal powder conveyer, 404 sack cleaner air outlet, 405 air-introduced machine
This patent is with heat smoke as dried medium, the method for control oxygen concentration provided by the utility model and is System, can overcome the moisture content of heat smoke in prior art, and lower oxygen content, for the smalls for needing to control oxygen concentration The drying of low humidity is carried out, is dried using the air of low humidity for oxygen concentration lump coal need not be controlled, so as to realize The essential safety of the higher thermal efficiency and dry run.During drying, dry tail gas and usually contain a part of granularity Less coal dust, is collected by the sack cleaner of system configuration, and exports Pulverized Coal Bin, preferential employing breeze blowing hot blast Stove, that is, ensure that the quality of environment, it is not necessary to pulverizing, burn the coal dust of more difficult transport airborne dust again, and breeze blowing air stove is to work as It is the type of furnace that front efficiency of combustion highest, consumption electric power are minimum.
To achieve these goals, as shown in Fig. 2 this utility model provides a kind of heat exchanger first, including with high temperature pipe The high-temperature flue gas room of road connection, is connected with the heat exchange tubule of many in high-temperature flue gas room, is to improve heat exchange efficiency, and heat exchange is thin Pipe is outer can also to install heat exchange fin.Other one section of heat exchange tubule is connected with low-temperature flue gas room, and high-temperature flue gas room and low temperature Smoke chamber is communicated as the same space with heat exchange thin tube inner wall, the outer wall of high-temperature flue gas room and low-temperature flue gas room and heat exchange tubule be every The space that opens, the heat exchange tubule outer wall for arranging at regular intervals constitute a closing space with heat exchanger outer wall, in this space One section open normal temperature air air inlet, in addition open hot-air air outlet for one section.During work, high warm flue gas pass through heat exchanger tubule During interior flowing, temperature is reduced by conducting heat exchange by the normal temperature air outside heat exchanger tubule, after normal temperature air heat exchange, temperature is improved, The heat smoke of so high temperature becomes the heat smoke of middle temperature by heat exchanger, and the air of room temperature reforms into the hot-air of middle temperature.Generally Typically below 5%, at 800-900 DEG C, below 10%, the oxygen of normal temperature air contains water capacity temperature high warm flue gas oxygen content 23%, water capacity is usually no more than 0.4% to amount.When 240 DEG C when drying thermal medium gas is needed, nearly 4 parts of air and one is needed Part high-temperature flue gas are mixed to get, can thus obtain oxygen content 16%, and water capacity dries thermal medium gas 2.4%.Central The heat smoke of temperature is mixed into cold air when drying thermal medium gas, just only needs to sub-fraction cold air, generally two parts of sky Gas is mixed with the middle warm flue gas of portion, so can be obtained by oxygen content in 10-14%, water capacity 3.6% or so excellent Show dries thermal medium gas.Through the pure air (water capacity that the middle warm air after heat exchanger heat exchange and normal temperature air are mixed into 240 DEG C 0.4%) thermal medium is dried.The heat that so air stove is produced is changed over two thermal medium sources of the gas, the loss without heat completely. One is used for drying smalls, and one is used for drying lump coal.
Generally coal can be classified according to granularity, and from 0 to 50mm, each granularity has the granularity of coal.Material is done The volume of dry dewatering time and material is directly proportional, and the coal of 0.5mm differs 100 times with the coal diameter of 50mm, and volume is differed 1000000 (1,000,000) times.This requires that the coal of different grain size scope has different drying times, the bigger drying of coal granularity Time is longer.Coal granularity is shorter for less drying time, needs dry temperature also lower.Coal generally between 0-1mm exists Exsiccator is taken out of by 60 DEG C or so of the thermal medium gas that dries directly after the top pan feeding of exsiccator.Other each granularity coals are dry In dry device each layer by adjust sieve aperture diameter so that each granularity coal have direct be sieved to up to lower screen, had is direct Multi-deck screen is crossed, had must progressively dry on each layer sieve, and so allowing for different grain size coal there are different drying times, reaches Essentially identical to each particle size fraction coal drying and dewatering.Two is coal drying there is a possibility that just there is detonation due to have a coal dust, The safety of guarantee coal drying is exactly the focus technology innovative point of present patent application.Must according to relevant national standard coal dust explosion Three below condition need to be provided simultaneously with, 1. coal dust there must be explosivity;2. coal dust is in suspended state in atmosphere, and reaches one (concentration limits of 0.75mm coal dusts are 50-2000g/m to fixed concentration3);3. there is the high temperature heat source (700-800 DEG C) of ignition. Present patent application dries coal using adverse current low temperature Wind Volume, that is, dry thermal medium gas general temperature when coal is dried and exist Less than 240 DEG C of low temperature, and the bottom air feed from exsiccator, from the top air-out of exsiccator, coal adds from the top of exsiccator Enter, coal is down trickled down from the top of exsiccator or big particle diameter coal is in layer down successively moved to from top along vibrated bed Exsiccator bottom, so thermal medium gas and coal stream are counter-current drying on the contrary, seeks to ensure in exsiccator using Wind Volume Top, the coal dust of 0-1mm are directly dried thermal medium gas and are taken out of exsiccator, dry thermal medium gas temperature in exsiccator top layer Degree is reduced to 60 DEG C or so, and the coal dust of 0-1mm is by 60 DEG C of gas drying.And ensure not surpass in the concentration of exsiccator top layer coal dust Cross the lower limit of safe concentration, generally no greater than 30g/m3, the concentration of other each layer coal dusts is in the several of safe concentration value lower limit Under the order of magnitude, in exsiccator, each section wind speed is higher, is also not in the coal dust of suspended state.Top layer in exsiccator There is no the high temperature heat source for igniting coal dust, destroy two conditions of coal dust explosion, present patent application is drying coal When be safe.
For dry essential safety, on the basis of above measure, coal classification is divided into by the granularmetric composition of raw coal Two specifications of smalls and lump coal, the typically smaller than coal dust of 0.75mm are substantially all in smalls, and smalls is dried using vibrating mixed flow Device, the purpose for drying thermal medium gas, just having reached essential safety using hypoxia, the water capacity of thermal medium gas are low, can reduce The temperature of aerofluxuss, realizes efficient drying.Lump coal after classification can adopt vibrating mixed flow dryer, it would however also be possible to employ other Exsiccator, is dried using the pure hot-air of the low water capacity of low temperature, that is, ensure that dry safety, improve the thermal efficiency again.
After thermal medium gas and coal direct contact heat transfer in two exsiccators, become the high dampness containing coal dust of low temperature Coal dust is separated by body by sack cleaner, and the gas after filtration can meet discharge standard, be extracted out heel row by air-introduced machine To air.The coal dust that sack cleaner is collected produces high warm flue gas using pulverized coal injection blown converter for drying after preferentially burning.This The process route of sample does not need coal pulverizer to grind coal dust, and the coal dust that dry run is collected just can meet requirement, has saved a large amount of Electric power, while pulverized coal injection blown converter only needs to be equipped with the blower fan of low pressure air quantity just at work, only need a small amount of power consumption, The thermal efficiency of fuel is more than 90%, more much higher than the thermal efficiency of chain furnace 60%, 5-6 lower than the power consumption of fluidized bed furnace Times.Simultaneously because coal dust burn-off rate is high, easy quick heating of lighting a fire is simple to operate, and easily, breeze blowing air stove is in load for control Also facilitate very much in regulation, during being coal drying, eliminate coal dust airborne dust, best environmental practice.
Below in conjunction with the accompanying drawings 1 and specific embodiment, the technical solution of the utility model and its advantage are described in detail in detail.
Embodiment one:Shown in Figure 1, the system of coal drying control oxygen concentration includes that Pulverized Coal Bin 101, coal-powder boiler is settled Room 104, heat exchanger 109, lump coal exsiccator 202, smalls exsiccator 302, sack cleaner 401 and air-introduced machine 405, coal drying The system for controlling oxygen concentration is the blood circulation of a closing.Smalls exsiccator 302 uses powder coal.
Pipeline is passed through by the gravitation of air-introduced machine 405 through exsiccator (lump coal exsiccator 202, smalls exsiccator 302) tail gas In suction sack cleaner 401, the coal powder conveyer 403 is located at below cleaner unit 401 by the coal dust in tail gas is defeated by pipeline It is sent in the Pulverized Coal Bin 101 of pulverized coal injection blown converter, the coal dust in Pulverized Coal Bin 101 is by 102 spirt coal dust of high pressure positive blower and burner noz(zle) The burning of air stove 103 produces high warm flue gas.
Coal dust in 103 combusting coal fines storehouse 101 of pulverized coal hot air furnace produces high warm flue gas, and this coal dust is bagroom 401 coal dusts that collects, the high warm flue gas settle the fine coal dust after burning, pure high warm through air stove expansion chamber 104 Flue gas enters the high-temperature flue gas room 108 of heat exchanger 109 through high-temperature flue gas pipeline 107;It is provided with the top of air stove expansion chamber 104 Connect with high-temperature flue gas pipeline 107 with air-valve 105, during work, pipeline valve (with air-valve) 105 can be according to exsiccator (lump coal Exsiccator 202, smalls exsiccator use temperature 302) under control of a computer program, automatically adjusts opening with air-valve 105 Degree, supplements normal temperature air to high-temperature flue gas so that the exit gas temperature control of heat exchanger 109 is within the scope of required.Tightly When anxious blowdown stack 106 is mainly used in hot blast furnace igniting or exsiccator is when there was a mechanical failure, flue gas is needed not enter exsiccator And the tapping equipment for arranging, it is to be closed during normal work.When high warm flue gas pass through in 109 tubule of heat exchanger, with The air entered from the normal temperature air import 111 for being arranged on heat exchanger bottom outside heat exchanger tubule is exchanged heat, and becomes middle warm Flue gas is collected in heat exchanger low-temperature flue gas room 110.Heat smoke is roused in smalls exsiccator 302 by smalls hot-air blower 301, to dividing Smalls after level is dried.The heat that the normal temperature air entered from normal temperature air import 111 is exchanged heat into middle temperature by the tubule that exchanges heat is empty Gas, the hot-air air outlet 112 in configured portion on heat exchangers rouse in lump coal exsiccator 202 under the gravitation of hot-air blower 201, Lump coal is dried, 202 preferential employing vibrating mixed flow dryer of lump coal exsiccator.So as to realize the circulation of fuel, coal Hypoxia is dried.
Sack cleaner 401 is provided with sack cleaner air inlet 402, coal powder conveyer 403 and sack cleaner air-out Mouth 404, sack cleaner air inlet 402 introduce air and the heat smoke from lump coal exsiccator 202, smalls exsiccator 302 are entered The coal dust that bagroom 401 is collected is transported to Pulverized Coal Bin 101 by row dedusting, coal powder conveyer 403;Sack cleaner air outlet 404 discharge 401 hot gas of bagroom.
Embodiment two:Different from upper example, lump coal exsiccator 202 can also adopt other exsiccators, because moisture-free coal Granularity is larger, it is possible to use such as net formula exsiccator, Cross-flow dryer etc..
As described above, clearly describe in detail the utility model proposes technical scheme.Although of the present utility model Preferred embodiment describes and explains this utility model in detail, but those skilled in the art is appreciated that and is not carrying on the back In the case of the spirit and scope of the present utility model of claims definition, can make in form and details multiple Modification.

Claims (6)

1. the system that a kind of coal drying controls oxygen concentration, which includes Pulverized Coal Bin (101), coal-powder boiler expansion chamber (104), heat exchanger (109), lump coal exsiccator (202), smalls exsiccator (302), sack cleaner (401) and air-introduced machine (405), its feature exist In, through lump coal exsiccator (202) and smalls exsiccator (302) tail gas by the gravitation of air-introduced machine (405) pass through pipeline suction In sack cleaner (401), the coal dust in tail gas is passed through pipeline by cleaner unit (401) coal powder conveyer (403) below is located at It is transported in the Pulverized Coal Bin (101) of pulverized coal injection blown converter, the coal dust in Pulverized Coal Bin (101) is by high pressure positive blower and burner noz(zle) (102) Spirt pulverized coal hot air furnace (103) burning produces high warm flue gas.
2. the system that coal drying controls oxygen concentration according to claim 1, it is characterised in that:Pulverized coal hot air furnace (103) fires The coal dust that bagroom (401) in firing coal dust storehouse (101) is collected produces high warm flue gas.
3. the system that coal drying controls oxygen concentration according to claim 2, it is characterised in that:The high warm flue gas are through hot blast After stove expansion chamber (104) sedimentation, pure high warm flue gas enter the high temperature of heat exchanger (109) through high-temperature flue gas pipeline (107) Smoke chamber (108).
4. the system that coal drying controls oxygen concentration according to claim 1, it is characterised in that:In air stove expansion chamber (104) be provided with the top of connect with high-temperature flue gas pipeline (107) with air-valve (105).
5. the system that coal drying controls oxygen concentration according to claim 1, it is characterised in that:It is provided with heat exchanger bottom Normal temperature air import (111).
6. the system that coal drying controls oxygen concentration according to claim 1, it is characterised in that:Portion is provided with heat exchangers Hot-air air outlet (112).
CN201620679896.5U 2016-07-01 2016-07-01 The system that a kind of coal drying controls oxygen concentration Active CN206019257U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106091659A (en) * 2016-07-01 2016-11-09 唐山市神州机械有限公司 A kind of coal drying controls the method and system of oxygen concentration

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106091659A (en) * 2016-07-01 2016-11-09 唐山市神州机械有限公司 A kind of coal drying controls the method and system of oxygen concentration

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