CN106091659A - A kind of coal drying controls the method and system of oxygen concentration - Google Patents
A kind of coal drying controls the method and system of oxygen concentration Download PDFInfo
- Publication number
- CN106091659A CN106091659A CN201610506946.4A CN201610506946A CN106091659A CN 106091659 A CN106091659 A CN 106091659A CN 201610506946 A CN201610506946 A CN 201610506946A CN 106091659 A CN106091659 A CN 106091659A
- Authority
- CN
- China
- Prior art keywords
- coal
- exsiccator
- air
- flue gas
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
- F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Drying Of Solid Materials (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
nullThe invention discloses a kind of coal drying and control the method and system of oxygen concentration，This 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 positioned at cleaner unit (401) coal powder conveyer (403) the below Pulverized Coal Bin (101) by Pipeline transport to pulverized coal injection blown converter,Coal dust in Pulverized Coal Bin (101) is burnt by high pressure positive blower and burner noz(zle) (102) spirt pulverized coal hot air furnace (103) and produces high-temperature hot flue gas.It achieves the Appropriate application 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
Technical field
The invention belongs to dry method ore dressing field, be specifically related to a kind of coal drying and control the method and system of oxygen concentration, its
Use heat exchanger that dry thermal medium gas carries out heat exchange cooling and varigrained coal is entered by two set drying devices respectively
Row is dried, and it is particularly well-suited to being dried 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..We life in obtain goods and materials data almost 100% by power generation processing obtain, at China's electric power
Produce nearly 60-70% to be obtained by burning coal.These coals generally have four types: anthracite, bituminous coal, long bituminous coal and
Brown coal.Although these four coal all contains charcoal, hydrogen, nitrogen, oxygen, sulfur and moisture, but these four solid state component and moisture containing quantitative change
Change huge.As senior anthracite carbon content is up to more than 90%, and rudimentary brown coal are about 30%, and moisture is at anthracite and cigarette
Only having 1% in coal, long bituminous coal is at 25-30%, and typically at 30-40% in brown coal, some area is up to 50-60%, relatively
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 when 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 fat coal resource such as bituminous coal, anthracite is fully utilized, expands space limited, the storage that China's brown coal are verified
Amount reaches 130,000,000,000 tons, accounts for the 13-15% of whole nation coal reserves, separately has the prognostic resources of 190,000,000,000 tons, and resource distribution collects relatively
In in northeastern Inner Mongolia and Yunnan Province.Brown coal degree of coalification is low, moisture is high, volatile matter is 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 during distance outward transport, cost of transportation height causes economic benefit
Difference.To this end, the upgrading technology that the low-order coal such as research and development brown coal effectively utilize, solve to trouble the pass of China's brown coal large-scale development
Key technology, makes brown coal play its due energy source contribution, has weight to supporting China's economy social development with brown coal Fu Cun district
Want meaning.
The most multiple existing exsiccator is dried coal, such as fluidized bed steam dry technology in the prior art.At stream
Changing in bed dryer, steam not only serves as dry medium but also as fluidizing agent.Therefore, the steam being dried evaporation is not
Containing air and other foreign material, 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 utilizing it to be released when condensing, and it is collapsed into superheated steam.Superheated steam is by height
Moisture coal stream blows to ebullated bed top and produces fluidisation phenomenon from the bottom of drying machine.Vapor adsorption coal raw coal at fluid bed
In the moisture that evaporates, raw coal from the top of drying machine input enters through cyclone separator, steam is partly led back to be dried again
Machine.Needed for drying machine, energy is to be provided by from steam turbine steam out.Concrete technology flow process is as shown in Figure 3.
Steam air combined drying technology, this method is that the power plant of burning basin, U.S.'s powder river coal is in recent years developed
Planting integrated dry technology, concrete technology flow process is as shown in Figure 4.It utilizes makees to be dried medium from condenser hot water out, although
Hot water drying than superheat steam drying on rate of drying and degree poor, but hot water is a kind of " used heat " for power plant,
Also need to use cooling tower cooling.Air is heated to after 43 DEG C the fluidizing agent as fluidized bed dryer by heat recirculated water, with
Time the hot water of 49 DEG C as the drying source medium of fluid bed.Result of the test shows, after using this method to be reduced by as-fired coal moisture,
Efficiency is greatly improved, CO2、SO2Discharge decline substantially.As a example by experiment power plant, moisture reduces 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%；Reduce due to coal flow and grindability carries
Height, coal pulverizer lower power consumption 17%；Blower fan lower power consumption 3.8%.Totally adding up, station service power consumption rate reduces 3.8%, and effect shows
Write.
Drum-type drying technology, its drying and dehydrating technical matters flow process is shown in Fig. 5.Cylindrical drier is adopted with its auxiliary facility
Use convective heat exchange mode, make the overall process of coal drying " seal feed, drying and dehydrating, sealing discharging " and be all dried master at one
Complete on machine.Being dried fuel used is coal raw coal.Cylinder dry technology uses high-temperature flue gas to carry out convection drying, unavoidably
The volatile matters such as CO are had to produce, further, since controllability is poor, it is difficult to maximizing, therefore, raw coal cylinder dry project application is less
Risk is big.
A manifold system, drum body is had to present heeling condition in drum shaped body as shown in Figure 6.Raw coal is continuously from upper
Side sends 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 provides, and low-pressure steam is along rousing the axially into inside and rapid to tube outer surface diffusion of body.Together with coal
Entering the air in body, after absorbing moisture, separate with dry pulverized coal in cleaner unit, a part re-compresses entrance and is dried
Machine, another part is just discharged into air.
Existing patent application ZL98251141.8 requires that wet stock must be all by each layer of bed body in exsiccator, this
The necessary granule size of sample wet stock is consistent the most, has bigger discrepancy with the brown coal of dry 0-50mm granularity.Existing patent application
ZL88219014.8 is monolayer vibrated fluidized bed, and its structure is mainly upper shell and participates in vibration together with vibrated bed, it is impossible to realize
The vibrating mixed flow with multilamellar that is dried of high throughput is dried the difference of essence.
Patent application " a kind of method of oxygen concentration in exsiccator reducing coal drying system " is for reducing oxygen content
Method, it carries out heat exchange process, reduces flue-gas temperature the exiting flue gas of vibrating mixed flow dryer；It is by reducing flue gas temperature
The flue gas of degree mixes with the high-temperature flue gas of air stove again, is reduced the mesh of oxygen content by repetitious circulation
, it is limited that the method reduces oxygen content, because the cooled flue gas looped back needs to consume substantial amounts of energy in cooling procedure,
And the circulating flue gas water capacity of cooling is 100%, when cooling air quantity is less, the amplitude of Control for Oxygen Content is limited, when cold
But when air quantity is bigger, due to the increase of water capacity, it has to the temperature improving aerofluxus ensures the operation safety of cleaner unit, does not has
Reaching to improve the raising of heat exchange efficiency, through Theoretical Calculation, its oxygen content is at least more than 15%.
Existing dry technology described above, or all use under the highest pressure and temperature, equipment manufacturing cost is high, needs
Want huge energy expenditure and running cost, or needing steam to be combined with power plant just can realize.Employing high-temperature flue gas
Drying brown coal, when being dried, the volatile matter of damage coal, causes dry run safety can not be guaranteed.
Summary of the invention
In order to solve problems of the prior art, the present inventor puts into substantial contribution, studies through for many years, proposes one
Plant coal drying and control the method and system of oxygen concentration.The present invention utilizes pipe heat exchanger to pass the high-temperature flue gas of air stove
Lead heat exchange and utilize the pulverized coal as fuel that dry cloth bag dust-precipitator is collected in dry run, using pulverized coal injection blown converter, it is achieved
The Appropriate application of dry run side-product coal dust, the abundant thermal efficiency of fuel combustion is high, and air stove configuration power is little.
According to a first aspect of the present invention, it is provided that a kind of coal drying controls the system of oxygen concentration, and it 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 inducing
Machine 405, it is characterised in that through exsiccator (lump coal exsiccator 202, smalls exsiccator 302) tail gas by the gravitation of air-introduced machine 405
By in pipeline suction sack cleaner 401, the coal dust in tail gas is positioned at cleaner unit 401 coal powder conveyer 403 below and is led to
Crossing Pipeline transport 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-temperature hot flue gas.
Wherein, the coal dust in pulverized coal hot air furnace 103 combusting coal fines storehouse 101 produces high-temperature hot flue gas, and this coal dust is that cloth bag is received
The coal dust that dirt device 401 is collected.This high-temperature hot flue gas fine coal dust after air stove expansion chamber 104 sedimentation burning, pure height
Warm flue gas enters the high-temperature flue gas room 108 of heat exchanger 109 through high-temperature flue gas pipeline 107.
Further, the air distribution valve 105 connected with high-temperature flue gas pipeline 107 it is provided with at air stove expansion chamber 104 top.
Heat exchanger bottom is provided with normal temperature air import 111.Portion is provided with hot-air air outlet 112 on heat exchangers.
According to a second aspect of the present invention, it is provided that a kind of coal drying controls the method for oxygen concentration, it uses adverse current low temperature
Wind Volume is dried coal, is i.e. dried thermal medium gas (the general temperature low temperature below 250 DEG C when dry coal), and from
The bottom air feed of exsiccator, from the top air-out of exsiccator, coal adds from the top of exsiccator, and coal is from the top of exsiccator
Down unrestrained or big particle diameter coal the most successively moves to exsiccator bottom along vibrated bed from top.
The heat exchanger of the method use that described coal drying controls oxygen concentration includes the high-temperature flue gas being connected with high-temperature pipe
Room, indoor at high-temperature flue gas and many heat exchange tubules are connected, and for improving heat exchange efficiency, can also install and change outside heat exchange tubule
Hot 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 flue gas room and heat exchange tubule
It is the space separated that inwall communicates the outer wall into the same space, high-temperature flue gas room and low-temperature flue gas room Yu heat exchange tubule, by certain
Spaced heat exchange tubule outer wall and heat exchanger outer wall form one and close space, open normal temperature air for one section in this space
Air inlet, opens hot-air air outlet for other one section.
Compared to existing technology, the method and system of control oxygen concentration provided by the present invention, it is possible to overcome prior art
The moisture content of middle heat smoke, and lower oxygen content, carry out being dried of low humidity, pin for needing the smalls controlling oxygen concentration
The air that need not control oxygen concentration lump coal employing low humidity is dried, it is achieved thereby that the higher thermal efficiency is with dry
The essential safety of process.During being dried, dry tail gas usually contains the coal dust that a part of granularity is less, is joined by system
The sack cleaner put is collected, and exports Pulverized Coal Bin, preferential employing breeze blowing air stove, i.e. ensure that the matter of environment
Amount, it is not necessary to pulverizing, burns again the coal dust of more difficult transport airborne dust, and breeze blowing air stove is that present combustion efficiency is the highest, consumes
Electric power is minimum is the type of furnace.
Accompanying drawing explanation
Fig. 1 is the system structure schematic front view controlling oxygen concentration according to the coal drying of the present invention；
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.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Base
Embodiment in the present invention, those of ordinary skill in the art obtained under not making creative work premise all its
His embodiment, broadly falls into the scope of protection of the invention.
Coal drying has the feature of its own compared with being dried with unclassified stores, and 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
Differ from 100 times, volume difference 1000000 (1,000,000) times.This just requires that the coal of different grain size scope has different drying times,
Coal granularity is the longest for the biggest drying time.Coal granularity is the shortest for the least drying time, needs the temperature being dried the lowest.Generally 0-
Coal between 1mm is directly taken out of exsiccator by the dry thermal medium gas of about 60 DEG C after pan feeding above exsiccator.Its
His each granularity coal in exsiccator each layer by adjusting the diameter of sieve aperture so that under what each granularity coal had directly is sieved to reach thoroughly
Layer sieve, have is directed through multi-deck screen, and have progressively must be dried on each layer sieve, thus makes different grain size coal have not
Same drying time, reach each particle size fraction coal drying and dewatering essentially identical.Two is that coal drying is owing to just having the existence of coal dust
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 country's phase
Pass standard coal dust explosion must be provided simultaneously with three below condition, and 1. coal dust must have explosivity；2. coal dust in atmosphere in
Suspended state, and (concentration limits of 0.75mm coal dust is 50-2000g/m to reach certain concentration3)；3. there is the high temperature of ignition
Thermal source (700-800 DEG C).Present patent application uses adverse current low temperature Wind Volume to be dried coal, is i.e. dried thermal medium gas and is being dried
General temperature low temperature below 250 DEG C during coal, and from the bottom air feed of exsiccator, from the top air-out of exsiccator, coal
Add from the top of exsiccator, coal from the top of exsiccator down unrestrained or big particle diameter coal along vibrated bed from one layer one of top
Layer the most successively moves to exsiccator bottom, so thermal medium gas and coal stream are counter-current drying on the contrary, employing Wind Volume is exactly
Ensureing the top at exsiccator, the coal dust of 0-1mm is directly dried thermal medium gas and takes exsiccator out of, at exsiccator top layer
Being dried thermal medium gas temperature and be reduced to about 60 DEG C, the coal dust of 0-1mm is by the gas drying of 60 DEG C.And ensure on exsiccator top
The concentration of layer coal dust is less than the lower limit of safe concentration, generally no greater than 30g/m3, the concentration of other each layer coal dust is in safety
Under several orders of magnitude of concentration value lower limit, in exsiccator, each cross section wind speed is higher, does not also have the coal dust of suspended state.
The most there is not the high temperature heat source igniting coal dust in the top layer at exsiccator, destroys two conditions of coal dust explosion, and this is specially
Profit application is safe when dry coal.
The present invention and existing patent application " a kind of method of oxygen concentration in exsiccator reducing coal drying system " exist
Also having bigger difference in principle, its distinctive points is mainly reflected in following innovative point.
The innovative point 1 of this technological invention, carries out conduction mainly by pipe heat exchanger to the high-temperature flue gas of air stove and changes
Heat, the Cryogenic air after heat exchange, water capacity is low, can have relatively low delivery temperature, and efficiency of utilization is high, does lump coal
Dry, the lump coal without coal dust is dried by the Cryogenic air of Wind Volume, and safety is high.After pipe heat exchanger carries out conducting heat exchange
High-temperature flue gas is converted into middle Low Temperature Thermal flue gas, then mixes with a small amount of air, it is possible to obtain low temperature, hypoxia, low humidity dry
Scorching medium gas, this flue gas oxygen content can control.Generally in raw coal, the quality of fine coal is the highest, by block, smalls separately
It is dried, it is possible to smalls is dried by the heat smoke realizing 10%-14% oxygen content, is ensureing that coal powder density is the most overproof
On the basis of, it is achieved hypoxia is dried.Arrive the essential safety of drying process.
The innovative point 2 of this technological invention, is to utilize the pulverized coal as fuel that dry cloth bag dust-precipitator is collected in dry run,
Using pulverized coal injection blown converter, it is achieved the Appropriate application of dry run side-product coal dust, the abundant thermal efficiency of fuel combustion is high, and air stove is joined
Put power little.
As shown in Figures 1 and 2 coal drying control the system structure schematic front view of oxygen concentration and the knot of heat exchanger
Structure schematic diagram, wherein reference particularly as follows:
101 Pulverized Coal Bin 102 high pressure positive blowers and burner noz(zle) 103 pulverized coal hot air furnace
104 coal-powder boiler expansion chamber 105 air distribution valve 106 dump chimneys
107 high-temperature flue gas pipeline 108 heat exchanger high-temperature flue gas room 109 heat exchangers
110 heat exchanger low-temperature flue gas room 111 normal temperature air air inlet 112 hot-air air outlets
201 lump coal hot-air blower 202 lump coal exsiccator 301 smalls hot-air blowers
302 smalls exsiccator 401 sack cleaner 402 sack cleaner air inlets
403 coal powder conveyer 404 sack cleaner air outlet 405 air-introduced machines
This patent is with heat smoke for dry medium, the method and system of control oxygen concentration provided by the present invention, energy
Enough overcome the moisture content of heat smoke in prior art, and lower oxygen content, carry out for needing the smalls controlling oxygen concentration
Being dried of low humidity, is dried for the air that need not control oxygen concentration lump coal employing low humidity, it is achieved thereby that relatively
The high thermal efficiency and the essential safety of dry run.During being dried, it is less that dry tail gas usually contains a part of granularity
Coal dust, the sack cleaner configured by system collected, and exports Pulverized Coal Bin, preferential employing breeze blowing air stove,
I.e. ensure that the quality of environment, it is not necessary to pulverizing, burn again the coal dust of more difficult transport airborne dust, breeze blowing air stove is current combustion
Burn that efficiency is the highest, consume electric power minimum is the type of furnace.
To achieve these goals, as in figure 2 it is shown, present invention firstly provides a kind of heat exchanger, including with high-temperature pipe even
The high-temperature flue gas room connect, indoor at high-temperature flue gas and many heat exchange tubules are connected, for improving heat exchange efficiency, outside heat exchange tubule
Heat exchange fin can also be installed.Other one section of heat exchange tubule is connected with low-temperature flue gas room, and high-temperature flue gas room and low-temperature flue gas
It is separate that room communicates the outer wall into the same space, high-temperature flue gas room and low-temperature flue gas room Yu heat exchange tubule with heat exchange thin tube inner wall
Space, the heat exchange tubule outer wall arranged at regular intervals and heat exchanger outer wall form one and close space, in this space
Section opens normal temperature air air inlet, opens hot-air air outlet for other one section.During work, high-temperature hot flue gas is by stream in heat exchanger tubule
Time dynamic, by heat exchanger tubule outside normal temperature air reduce temperature by conduction heat exchange, improve temperature after normal temperature air heat exchange, so
The heat smoke of 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 high temperature
Heat smoke oxygen content is typically below 5%, and temperature is at 800-900 DEG C, and water capacity is below 10%, and the oxygen content of normal temperature air exists
23%, water capacity is usually no more than 0.4%.When needing the dry thermal medium gas of 240 DEG C, need nearly 4 parts of air high with portion
Temperature flue gas is mixed to get, and thus can obtain oxygen content 16%, water capacity 2.4% dry thermal medium gas.Central temperature
When heat smoke and cold air are mixed into dry thermal medium gas, just have only to sub-fraction cold air, be about the air of two parts with
A middle warm flue gas mixing, so can be obtained by oxygen content at 10-14%, water capacity about 3.6% outstanding dry
Scorching medium gas.Middle warm air after heat exchanger heat exchange and normal temperature air are mixed into the pure air (water capacity of 240 DEG C
0.4%) it is dried thermal medium.The heat that so air stove produces is changed over two thermal medium sources of the gas completely, does not has the loss of heat.
One is used for being dried smalls, and one is used for being dried lump coal.
Generally coal can carry out classification 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, the coal of 0.5mm and the coal different diameters 100 times of 50mm, and volume differs
1000000 (1,000,000) times.This just requires that the coal of different grain size scope has different drying times, and coal granularity is the driest
Time is the longest.Coal granularity is the shortest for the least drying time, needs the temperature being dried the lowest.Coal between generally 0-1mm exists
Directly taken out of exsiccator by the dry thermal medium gas of about 60 DEG C after the top pan feeding of exsiccator.Other each granularity coals are dry
In dry device, each layer is by adjusting the diameter of sieve aperture so that what each granularity coal had directly is sieved to reach lower screen thoroughly, and have is the most saturating
Crossing multi-deck screen, have progressively must be dried on each layer sieve, thus makes different grain size coal have different drying times, reaches
Essentially identical to each particle size fraction coal drying and dewatering.Two be coal drying owing to there being the existence of coal dust just to have the probability of detonation,
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
Need to be provided simultaneously with three below condition, 1. coal dust must have explosivity；2. coal dust is in atmosphere in suspended state, and reaches one
(concentration limits of 0.75mm coal dust is 50-2000g/m to fixed concentration3)；3. there is the high temperature heat source (700-800 DEG C) of ignition.
Present patent application uses adverse current low temperature Wind Volume to be dried coal, is i.e. dried thermal medium gas general temperature when dry coal and exists
The low temperature of less than 240 DEG C, and from the bottom air feed of exsiccator, from the top air-out of exsiccator, coal adds from the top of exsiccator
Entering, coal is down unrestrained from the top of exsiccator or particle diameter coal greatly the most successively moves to along vibrated bed from top
Exsiccator bottom, so thermal medium gas and coal stream are counter-current drying on the contrary, uses Wind Volume to seek to ensure at exsiccator
Top, the coal dust of 0-1mm is directly dried thermal medium gas and takes exsiccator out of, is dried thermal medium gas temperature at exsiccator top layer
Degree is reduced to about 60 DEG C, and the coal dust of 0-1mm is by the gas drying of 60 DEG C.And ensure that the concentration at exsiccator top layer coal dust does not surpasses
Cross the lower limit of safe concentration, generally no greater than 30g/m3, the concentration of other each layer coal dust is several safe concentration value lower limit
Under the order of magnitude, in exsiccator, each cross section wind speed is higher, does not also have the coal dust of suspended state.Exsiccator top layer also
There is not the high temperature heat source igniting coal dust, destroy two conditions of coal dust explosion, present patent application is at dry coal
Time be safe.
For dry essential safety, on the basis of above measure, coal classification is divided into by the granularmetric composition of raw coal
Smalls and two specifications of lump coal, the coal dust of typically smaller than 0.75mm is substantially all in smalls, and smalls uses vibrating mixed flow to be dried
Device, uses the dry thermal medium gas of hypoxia, has just reached the purpose of essential safety, and the water capacity of thermal medium gas is low, can reduce
The temperature of aerofluxus, it is achieved high efficiency dry.Lump coal after classification can use vibrating mixed flow dryer, it would however also be possible to employ other
Exsiccator, uses the pure hot-air dry of the low water capacity of low temperature, i.e. ensure that dry safety, improve again the thermal efficiency.
After thermal medium gas in two exsiccators and coal direct contact heat transfer, become the high humidity containing coal dust of low temperature
Body, is separated coal dust by sack cleaner, and the gas after filtration can meet discharge standard, is extracted out heel row by air-introduced machine
To air.The coal dust that sack cleaner is collected produces high-temperature hot flue gas for being dried after preferentially using the burning of pulverized coal injection blown converter.This
The process route of sample need not coal pulverizer and grinds coal dust, and the coal dust that dry run is collected just can meet requirement, has saved a large amount of
Electric power, pulverized coal injection blown converter has only to be equipped with the blower fan of low pressure air quantity just at work simultaneously, only needs 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, simple to operate, control easily, breeze blowing air stove is at load
In regulation the most convenient, during being coal drying, eliminate coal dust airborne dust, best environmental practice.
Below in conjunction with the accompanying drawings 1 and specific embodiment, technical scheme and beneficial effect thereof are described in detail in detail.
Embodiment one: shown in Figure 1, coal drying controls the system of oxygen concentration and includes that Pulverized Coal Bin 101, coal-powder boiler settle
Room 104, heat exchanger 109, lump coal exsiccator 202, smalls exsiccator 302, sack cleaner 401 and air-introduced machine 405, coal drying
Control the blood circulation that system is a closing of oxygen concentration.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, it is defeated by pipeline that the coal dust in tail gas is positioned at cleaner unit 401 coal powder conveyer 403 below
Delivering 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 coal dust
Air stove 103 burning produces high-temperature hot flue gas.
Coal dust in pulverized coal hot air furnace 103 combusting coal fines storehouse 101 produces high-temperature hot flue gas, and this coal dust is bagroom
401 coal dusts collected, this high-temperature hot flue gas fine coal dust after air stove expansion chamber 104 sedimentation burning, pure high-temperature hot
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 at air stove expansion chamber 104 top
The air distribution valve 105 connected with high-temperature flue gas pipeline 107, during work, pipeline valve (air distribution valve) 105 can be according to exsiccator (lump coal
Exsiccator 202, smalls exsiccator 302) use temperature under control of a computer program, be automatically adjusted opening of air distribution valve 105
Degree, supplements normal temperature air to high-temperature flue gas so that the exit gas temperature of heat exchanger 109 controls within the scope of required.Tightly
When anxious blowdown stack 106 is mainly used in air stove igniting or exsiccator is time there was a mechanical failure, flue gas is needed not enter exsiccator
And the tapping equipment arranged, it is in closed mode during normal work.High-temperature hot flue gas by time in heat exchanger 109 tubule, with
The air entered from the normal temperature air import 111 being arranged on heat exchanger bottom outside heat exchanger tubule carries out heat exchange, becomes middle warm
Flue gas collects in heat exchanger low-temperature flue gas room 110.Heat smoke is entered in smalls exsiccator 302 by smalls hot-air blower 301 drum, to dividing
Smalls after Ji is dried.The normal temperature air entered from normal temperature air import 111 is empty by the heat of heat exchange tubule heat exchange Cheng Zhongwen
Gas, the hot-air air outlet 112 in configured portion on heat exchangers rouses in lump coal exsiccator 202 under the gravitation of hot-air blower 201,
Being dried lump coal, lump coal exsiccator 202 preferentially uses vibrating mixed flow dryer.Thus 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 introduces air and enters the heat smoke from lump coal exsiccator 202, smalls exsiccator 302
Row dedusting, the coal dust that bagroom 401 is collected is transported to Pulverized Coal Bin 101 by coal powder conveyer 403；Sack cleaner air outlet
404 discharge bagroom 401 hot gas.
Embodiment two: different from upper example, lump coal exsiccator 202 can also use other exsiccator, because moisture-free coal
Granularity is bigger, it is possible to use such as net formula exsiccator, Cross-flow dryer etc..
As above-mentioned, the most clearly describe in detail the technical scheme that the present invention proposes.Although the present invention is preferable to carry out
Example describes and explains the present invention in detail, but those skilled in the art is appreciated that and is wanting without departing substantially from appended right
In the case of seeking the spirit and scope of the present invention of definition, multiple amendment can be made in form and details.
Claims (8)
1. coal drying controls a system for oxygen concentration, and it 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 exists
In, passed through pipeline through exsiccator (lump coal exsiccator (202), smalls exsiccator (302)) tail gas by the gravitation of air-introduced machine (405)
In suction sack cleaner (401), the coal dust in tail gas is positioned at cleaner unit (401) coal powder conveyer (403) below to be passed through
Pipeline transport is interior to the Pulverized Coal Bin (101) of pulverized coal injection blown converter, and 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-temperature hot flue gas.
The most according to claim 1, coal drying controls the system of oxygen concentration, it is characterised in that: pulverized coal hot air furnace (103) fires
Coal dust in firing coal dust storehouse (101) produces high-temperature hot flue gas, and this coal dust is the coal dust that bagroom (401) is collected.
The most according to claim 2, coal drying controls the system of oxygen concentration, it is characterised in that: this high-temperature hot flue gas is through hot blast
Fine coal dust after stove expansion chamber (104) sedimentation burning, pure high-temperature hot flue gas enters heat exchange through high-temperature flue gas pipeline (107)
The high-temperature flue gas room (108) of device (109).
The most according to claim 1, coal drying controls the system of oxygen concentration, it is characterised in that: at air stove expansion chamber
(104) top is provided with the air distribution valve (105) connected with high-temperature flue gas pipeline (107).
The most according to claim 1, coal drying controls the system of oxygen concentration, it is characterised in that: it is provided with in heat exchanger bottom
Normal temperature air import (111).
The most according to claim 1, coal drying controls the system of oxygen concentration, it is characterised in that: portion is provided with on heat exchangers
Hot-air air outlet (112).
7. using the method that the coal drying of said system controls oxygen concentration, it uses adverse current low temperature Wind Volume to carry out moisture-free coal
Charcoal, is i.e. dried thermal medium gas (the general temperature low temperature below 250 DEG C when dry coal), and supplies from the bottom of exsiccator
Wind, from the top air-out of exsiccator, coal adds from the top of exsiccator, and coal is down trickled down from the top of exsiccator or big grain
Footpath coal the most successively moves to exsiccator bottom along vibrated bed from top.
The method that the most according to claim 7, coal drying controls oxygen concentration, it is characterised in that its heat exchanger used includes
The high-temperature flue gas room being connected with high-temperature pipe, indoor at high-temperature flue gas and many heat exchange tubules are connected, for improving heat exchange effect
Rate, can also install heat exchange fin outside heat exchange tubule.Other one section of heat exchange tubule is connected with low-temperature flue gas room, and high-temperature flue gas
Room and low-temperature flue gas room communicate with heat exchange thin tube inner wall as the same space, high-temperature flue gas room and low-temperature flue gas room and heat exchange tubule
Outer wall is the space separated, and the heat exchange tubule outer wall arranged at regular intervals and heat exchanger outer wall form one and close space,
In this space one section opens normal temperature air air inlet, opens hot-air air outlet for other one section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610506946.4A CN106091659A (en) | 2016-07-01 | 2016-07-01 | A kind of coal drying controls the method and system of oxygen concentration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610506946.4A CN106091659A (en) | 2016-07-01 | 2016-07-01 | A kind of coal drying controls the method and system of oxygen concentration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106091659A true CN106091659A (en) | 2016-11-09 |
Family
ID=57214260
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610506946.4A Pending CN106091659A (en) | 2016-07-01 | 2016-07-01 | A kind of coal drying controls the method and system of oxygen concentration |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106091659A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108534562A (en) * | 2018-03-21 | 2018-09-14 | 安徽骏马化工科技股份有限公司 | Red lead oxidation furnace residual-heat utilization method |
| CN111076569A (en) * | 2018-10-19 | 2020-04-28 | 济南蓝辰能源技术有限公司 | Co2Closed cooling tower checking method for gas cooling |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4252638A (en) * | 1977-12-07 | 1981-02-24 | Klockner-Humboldt-Deutz Ag | Method for the desulfurization of coal |
| CN101705131A (en) * | 2009-11-19 | 2010-05-12 | 李功民 | Raw coal upgrading device and method with combination of drying and dry separation |
| CN201593905U (en) * | 2009-11-19 | 2010-09-29 | 唐山市神州机械有限公司 | Mixed flow vibration drying device |
| CN101893370A (en) * | 2010-07-07 | 2010-11-24 | 华北电力大学（保定） | System adopting high concentration CO2 flue gas as coal dust drying medium in boiler |
| CN102175076A (en) * | 2010-12-15 | 2011-09-07 | 中国神华能源股份有限公司 | Method for reducing oxygen concentration in drier of coal drying system |
| CN103134270A (en) * | 2011-12-02 | 2013-06-05 | 秦皇岛秦冶重工有限公司 | Lignite drying system and lignite drying method |
| CN103468837A (en) * | 2013-08-15 | 2013-12-25 | 宝钢集团新疆八一钢铁有限公司 | Safe method applicable to shaft furnace soft coal preparation and jetting |
| CN103528342A (en) * | 2013-08-05 | 2014-01-22 | 神华集团有限责任公司 | Coal slime drying system and coal slime drying process |
| CN105441687A (en) * | 2015-11-30 | 2016-03-30 | 中冶南方工程技术有限公司 | Dust recycling process and system for iron and steel plant |
| CN106052366A (en) * | 2016-07-01 | 2016-10-26 | 唐山市神州机械有限公司 | Method and system for controlling oxygen concentration through coal drying |
| CN206019257U (en) * | 2016-07-01 | 2017-03-15 | 唐山市神州机械有限公司 | The system that a kind of coal drying controls oxygen concentration |
-
2016
- 2016-07-01 CN CN201610506946.4A patent/CN106091659A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4252638A (en) * | 1977-12-07 | 1981-02-24 | Klockner-Humboldt-Deutz Ag | Method for the desulfurization of coal |
| CN101705131A (en) * | 2009-11-19 | 2010-05-12 | 李功民 | Raw coal upgrading device and method with combination of drying and dry separation |
| CN201593905U (en) * | 2009-11-19 | 2010-09-29 | 唐山市神州机械有限公司 | Mixed flow vibration drying device |
| CN101893370A (en) * | 2010-07-07 | 2010-11-24 | 华北电力大学（保定） | System adopting high concentration CO2 flue gas as coal dust drying medium in boiler |
| CN102175076A (en) * | 2010-12-15 | 2011-09-07 | 中国神华能源股份有限公司 | Method for reducing oxygen concentration in drier of coal drying system |
| CN103134270A (en) * | 2011-12-02 | 2013-06-05 | 秦皇岛秦冶重工有限公司 | Lignite drying system and lignite drying method |
| CN103528342A (en) * | 2013-08-05 | 2014-01-22 | 神华集团有限责任公司 | Coal slime drying system and coal slime drying process |
| CN103468837A (en) * | 2013-08-15 | 2013-12-25 | 宝钢集团新疆八一钢铁有限公司 | Safe method applicable to shaft furnace soft coal preparation and jetting |
| CN105441687A (en) * | 2015-11-30 | 2016-03-30 | 中冶南方工程技术有限公司 | Dust recycling process and system for iron and steel plant |
| CN106052366A (en) * | 2016-07-01 | 2016-10-26 | 唐山市神州机械有限公司 | Method and system for controlling oxygen concentration through coal drying |
| CN206019257U (en) * | 2016-07-01 | 2017-03-15 | 唐山市神州机械有限公司 | The system that a kind of coal drying controls oxygen concentration |
Non-Patent Citations (2)
| Title |
|---|
| 张丽早: "论低阶煤的分质利用", 《煤炭加工与综合利用》 * |
| 李功民: "应用双干工艺实现褐煤提质的技术", 《第16届国际选煤大会论文集》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108534562A (en) * | 2018-03-21 | 2018-09-14 | 安徽骏马化工科技股份有限公司 | Red lead oxidation furnace residual-heat utilization method |
| CN108534562B (en) * | 2018-03-21 | 2019-11-15 | 安徽徽能化工科技有限公司 | Red lead oxidation furnace residual-heat utilization method |
| CN111076569A (en) * | 2018-10-19 | 2020-04-28 | 济南蓝辰能源技术有限公司 | Co2Closed cooling tower checking method for gas cooling |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102419079B (en) | Solid particle material composite grading and drying device and method | |
| CN103575068B (en) | Lignite drying water recycling and drying tail gas recycling system | |
| CN100400996C (en) | Nitrogen circulating coal powder air flow internal heating fluidized bed drying technology | |
| CN103123205B (en) | Fluidization moving series arrangement steam drying system and technology | |
| CN102798132A (en) | Fan mill front counter flow type furnace-smoke drying dewatering direct blowing pulverization system | |
| CN104534850B (en) | A kind of predrying system and method for raw coal low temperature utilizing flue gas, exhaust steam used heat | |
| CN202032602U (en) | Lignite roller flue gas pre-drying power generation integrated system | |
| CN102759118A (en) | Lignite drum smoke pre-drying power generation integrated system and process | |
| CN202132964U (en) | Fan mill front counter flow type furnace-smoke drying dewatering direct blowing pulverizer system | |
| CN104964528B (en) | One utilizes surplus heat of power plant to carry out pre-dried run coal bin to low-order coal | |
| CN204678851U (en) | A kind of living beings conveying and drying integrated gasifying device | |
| CN102585867B (en) | System for conditioning through coking charge coal humidity difference | |
| CN106091659A (en) | A kind of coal drying controls the method and system of oxygen concentration | |
| CN106052366A (en) | Method and system for controlling oxygen concentration through coal drying | |
| CN206019257U (en) | The system that a kind of coal drying controls oxygen concentration | |
| CN206890551U (en) | A kind of lignite burning utilizes system | |
| CN102533302A (en) | Internal heating type dryer for in-furnace coking coal dehumidification | |
| CN110205150B (en) | Improved coking coal moisture control method and equipment | |
| CN104132359A (en) | Open powder making steam warm air type boiler unit and power generation system thereof | |
| CN218001483U (en) | Low-calorific-value fuel resource combustion utilization device | |
| CN206019258U (en) | The system that a kind of coal drying controls oxygen concentration | |
| CN202492499U (en) | Internal heating type dryer for dehumidifying coking coal entering into furnace | |
| CN102798269B (en) | Method and equipment for drying/cooling large particles of coal in guide duct type packed tower by cyclic utilization of superheated steam | |
| CN204786512U (en) | Unit pulverized -coal system with coal drying and water recovery function | |
| CN2771667Y (en) | Coal-storage cabin |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20161109 |