CN205528602U - Built -in hot fluidized bed coal humidifying device of clean high -efficient step screening - Google Patents

Abstract

The utility model discloses a built -in hot fluidized bed coal humidifying device of clean high -efficient step screening, including high -amplitude screening machine, rubbing crusher, blender, fluid -bed damping machine and flue gas exhaust -heat boiler, the fluid -bed damping machine includes feed inlet, bin outlet and fluidizing air air exit, and the high -amplitude screening machine is connected with the feed inlet of rubbing crusher and fluid -bed damping machine respectively, and rubbing crusher is connected with the blender, and the bin outlet of fluid -bed damping machine also is connected with the blender, and the air exit and the flue gas exhaust -heat boiler of fluid -bed damping machine are connected. The utility model discloses refine coal humidifying process with the material characteristic according to present coking blending technological requirement, imbedded the screening of coal particles particle diameter step in coal humidifying process, the selectivity is smashed and the granulation is retrieved to the coal flying dust, adopts mechanical grading and low temperature variable speed fluidization bed mode to realize that the coal particles particle diameter sieves step by step, guaranteed that coal particles smashes, drying and coal dust 's orderly control, reduced the unreasonable input of processing of coal charge repeated machining and energy.

Description

Clean and effective step sieves built-in fluidized hot bed coal humidity control device

Technical field

This utility model relates to coking industry coking technology field, especially relates to a kind of clean and effective step sieve Divide built-in fluidized hot bed coal humidity control device.

Background technology

Coal humidifying technology (CMC) refers to " control of coking coal charge moisture " technique, and it is at coking with dry coal Growing up on the basis of technology, ultimate principle is that coal for coking utilizes before shove charge exterior-heat heat It is dried, is dehydrated, reach the moisture regulation of coal and control, requiring moisture in coal control according to current coke making process System is about 6%, thus realizes reducing the energy input of process of coking, ensureing that coke oven runs operational stability, carries High coke quality or the amount of allocating into of increase weak caking coal, the purpose of minimizing coke plant wastewater amount.Meanwhile, shove charge The water capacity of coking coal reduces, and the bulk density of coal strengthens, and improves coke output accordingly.

Along with the development of China's coal conditioning technique, existing multiple coal conditioning technique scheme, mainly include with low pressure Steam is that the multitube rotary formula of heat carrier is dried and fluid bed drying scheme with flue gases of cock oven as heat carrier Deng.Through the test of operative practice, existing coal humidifying technology device all also exists some defects, uses low pressure Steam, as heat carrier, needs vapour source, utilizes high-grade energy.Also flue gases of cock oven conduct is utilized Heat carrier, but need high-temperature flue gas long distance delivery, Wind Volume high-temperature blower energy consumption and flue gas heat loss are relatively Greatly, and flue gas flow is limited, and thermal capacity is relatively low, and adjustability is poor.Secondly, domestic numerous independent Jiao Changing enterprise's coke oven thermal source and use coke-stove gas, the flue gas moisture of generation is high, and therefore, flue is airborne wet Ability is low, affects damping efficiency.Such scheme except having that energy consumption is high, regulating power is low, infrastructure investment is big, The problems such as operating cost height, control and regulation complexity and maintenance and repair amount are big.When coal charge moisture content is too high, permitted Many coals damping drying device is affected, and has a strong impact on effect and the efficiency of coal humidifying technology.

Utility model content

This utility model is in order to solve heat recovery and the pollutant cleaning discharge of current coke furnace system Problem, provides a kind of clean and effective step and sieves built-in fluidized hot bed coal humidity control device, including high-amplitude for this Screening machine 1, pulverizer 2, blender 5, fluidized bed type damping machine and flue-gas waste-heat boiler 8, described stream Change bed damping machine and include charging aperture 14, discharge gate 20 and fluidized wind exhaust outlet 16, described high-amplitude screen extension set 1 is connected with the charging aperture 14 of pulverizer 2 and fluidized bed type damping machine respectively, pulverizer 2 and blender 5 Connecting, the discharge gate 20 of fluidized bed type damping machine is also connected with blender 5, and high-amplitude screen 3 screens out and is less than The coal charge of 3mm particle diameter is directly entered fluidized bed type damping machine, is dried dehumidifying；More than more than 3mm grain The coal charge in footpath enters pulverizer, carries out selective molecular attraction, subsequently into blender, goes out with fluid bed damping machine That comes is dried coal charge mixing, and the exhaust outlet 16 of fluidized bed type damping machine is connected with flue-gas waste-heat boiler 8.

This utility model clean and effective step sieves built-in fluidized hot bed coal humidity control device, at the powder of pulverizer 2 Cleaner unit 3 and comminutor 4 also it is sequentially connected with between dirt outlet and blender 5, fluidized bed type damping machine Fluidized wind exhaust outlet 16 is connected with cleaner unit 3.

This utility model clean and effective step sieves built-in fluidized hot bed coal humidity control device, at high-amplitude screen extension set 1 In chute on be provided with attemperator, at the beginning of preventing the coal charge downslide process screened out and cell wall from cohering and being formed Step is dried, and the thermal medium that adds of attemperator uses high-temperature-hot-water, and hot water inlet temperature controls at 150-130 DEG C Between, hot water outlet temperature controls between 130-110 DEG C, and material size is at below 50mm, sieve aperture chi Very little 6-12mm, amplitude 15-25mm.

This utility model clean and effective step sieves built-in fluidized hot bed coal humidity control device, and described fluidized bed type is adjusted Wet machine also includes first paragraph fluidisation air compartment 13 and second segment fluidisation air compartment 21, described first paragraph fluidisation air compartment 13 Interior without coll(-tube) heater, there is one layer of bed bottom；Second segment fluidisation air compartment 6 is main by some damping moulds Block forms, and is provided with coll(-tube) heater in damping module；

Charging aperture 14 is at the top outer of first paragraph fluidisation air compartment 13, first paragraph fluidisation air compartment 13 and second segment stream It is provided with an adjustable overflow plate 12 between wind-transformation room 21, controls to enter into second by adjustable overflow plate The coal charge flow of Duan Liuhua air compartment；The first paragraph fluidisation the most external air preheater 11 of air compartment 13 and the One fluidized air blower 10, second segment fluidisation external second fluidized air blower 25 of air compartment 21；

Fluidized wind exhaust outlet 16 is additionally provided with reheater in the top of fluidized bed type damping machine, fluidized wind exhaust outlet 16 17, reheater 17 is connected with flue-gas waste-heat boiler 8；

One expansion chamber 18, second segment fluidisation air compartment 21 and expansion chamber 18 are arranged at the top in fluidized bed type damping machine Between for fluidized drying district 19.

This utility model clean and effective step sieves built-in fluidized hot bed coal humidity control device, described air preheater 11 and reheater 17 in be equipped with coll(-tube) heater, air preheater 11 and flue-gas waste-heat boiler 8 Connecting, flue-gas waste-heat boiler 8 gives the coll(-tube) heater heat supply in air preheater 11, air preheat The air vent of device 11 is directly accessed the cloth wind cabin of first paragraph fluidisation air compartment 13.Described air preheater is used for adding Hot-fluid wind-transformation, improves the volume wind speed of fluidized wind and carries wet ability.Air enters at first class blower fan, The coal charge fallen by air preheater entrance first paragraph fluidisation air compartment and charging aperture is carried out convection current for the first time and changes Heat, the coal charge falling fluidized-bed bottom and the bed being dried are conducted heat in fluidisation state, and dehumidification is further dried.

This utility model clean and effective step sieves built-in fluidized hot bed coal humidity control device, first paragraph fluidisation air compartment 13 and the bottom of each damping module of second segment fluidisation air compartment 21 be provided with independent cloth wind cabin, cloth wind cabin It is made up of air compartment 23, air distribution plate 22 and cloth blast cap；Second fluidized air blower 25 is in parallel to each Separate Wind Barn It is equipped with control valve 24 between air feed, and each cloth wind cabin.

This utility model clean and effective step sieves built-in fluidized hot bed coal humidity control device, described flue gas waste heat Boiler 8 is connected with chimney 7 by air-introduced machine 6.

This utility model refines coal damping operation according to existing coke making and coal blending technological requirement and material characteristic, In coal damping operation, embedded in the screening of coal particle particle diameter step, selective molecular attraction and coal fly ash recovery make Grain, i.e. based on built-in fluidized hot bed damping machine, embeds screen and divides and dedusting granulating working procedure composition.

This utility model uses mechanical grading and low temperature speed change fluid bed process to achieve coal particle particle diameter step by step Screening, can sieve out entering the coal particle of more than 3mm in stove coking coal, it is ensured that coal particle pulverizing, It is dried and the orderly control of coal dust, decreases coal charge and repeat processed and the unreasonable input of energy.

This utility model is prone to the situation hardened in fluid bed for high humility coal charge, it is difficult to desiccant dehumidification, Have employed the process unit of a kind of coking coal stage drying step damping, use two-period form drying technology process, First paragraph fluidisation air compartment, air preheater and first class blower fan form first paragraph humidifying technology loop, mainly Solve high humility coal charge initial rapid draing dehumidification problem, in damping module, set up fluidized state as early as possible. Along with coal charge is dried dehumidification process, in the second segment damping that second segment fluidisation air compartment and the second fluidized air blower are formed In process loops, coal charge temperature and the fluidizing velocity of each damping module use step to control, each irradiation modules Fluidising air velocity and fluidized bed temperature can progressively reduce according to coal charge degree of drying and reduce, and form step damping Technological requirement so that energy Reasonable input in coal humidifying technology flow process, dust emission is controlled in order.

Main heating source needed for the whole technological process that this utility model is formed is from flue gases of cock oven waste heat, logical Cross flue-gas waste-heat boiler and produce saturated hot-water.In technological process, the thermal medium of each heat-exchanger rig is saturated Hot water.With saturated hot-water be exchanger heat carrier, with air for fluid bed fluidizing agent.Saturated hot-water heats The main heating source of thermal source is from flue gases of cock oven waste heat, when wet moisture content of coal is too high, in fluidized bed type damping machine Coal charge more difficult fluidized drying time, use air preheater fluidization air temperature is heated to about 90 DEG C, make Obtaining the fluidisation pathogenic wind-warm in the first process loops to improve, volume wind speed improves so that high-moisture coal charge can be preferably Fluidisation heat exchange, meets coal charge fluidized drying needs.

The fluidizing agent of this utility model employing and the selection of heat transfer medium, be respectively according to its physical characteristic and carry Air that wet ability is stronger and the bigger high-temperature-hot-water of thermal capacity.Relative to traditional fluidized bed type coal damping work The maximum feature of skill be by the heat-carrying in coal humidifying technology, carry wet and fluidisation working medium separate, control adjust Can accomplish on Jie to control flexibly, precisely process, be particularly adapted to the dry damping of high humility coal charge.

This utility model uses built-in heat exchanger fluidized drying method, uses the heat transfer medium high-temperature hot of high specific heat Water is dried damping and fluid bed fluidizing agent heat source as wet coal, and fluidizing agent institute calorific requirement is only without interior Putting the 20% of heater, the fluidized gas scale of construction also ratio uses flue gas to make few about the 20%-30% of fluidizing agent, Fluidizing velocity is 0.5-1.3m/s；Using pressure 0.4-0.6MPa, temperature is the saturated heat of 120 DEG C-160 DEG C Water is as the heat transfer medium of exsiccator；Stagewise is dried the damping machine of step damping higher Load Regulation Scope and high humility coal adaptability.

Wet coal in fluidized bed type damping machine of the present utility model be in 60 DEG C-80 DEG C low heating-up temperature and The low fluidizing velocity fluidisation intensified heat transfer method of 0.5-1.3m/s, fluidized wind pathogenic wind-warm can according to the moisture of coal height, In the range of room temperature to 90 DEG C adjustable.Improve built-in heat exchanger and coal and the fluid effect of fluidization air and Heat exchange efficiency, meanwhile, the danger of the coal Volatile detonation can being effectively prevented from coal humidifying technology flow process Dangerous, low fluidizing velocity can prevent built-in heat exchanger tube bank from wearing and tearing with wet coal.

Damping ability of the present utility model is adjusted to 6% situation from wet moisture content of coal content 14.0%, and thermal source is by Jiao Stove flue gas waste heat provides, and when wet moisture content of coal content is more than 14%, can adjust stream by air preheater Wind-transformation pathogenic wind-warm, strengthens its fluid effect and heat transfer efficiency.

The technique formed by this device, its energy balance set up on the basis of material balance, the throwing of energy Entering is with the inventory of technological process and technological requirement as foundation, is inverse ratio according to coal charge moisture content with its particle diameter Relation, carry out coal charge shunting process, in existing coal preparation technology flow process, be additionally arranged coal charge particle screening and coal Material dust reclaims and granulating working procedure, fluidized bed coal drying process and low-grade heat source recycling system, shape Become the coal humidifying technology of a kind of energy-saving, environment-friendly and high-efficiency.Technology embody step screening, classification energy former Then, it is to avoid the over grind of coal charge and energy unreasonable input in original technological process so that low-grade Flue gases of cock oven thermal source carry out upgrading recovery, effectively utilize.

The flue gases of cock oven waste heat of the low-grade energy matter that this utility model uses carries out upgrading recycling so that The structural shape of dehumidification process unit is suitable for diversification UTILIZATION OF VESIDUAL HEAT IN.Main heating source in technological process is low Temperature flue gases of cock oven waste heat modification utilizes, and produces overheated hot water by the waste heat boiler of high efficient gas and liquid, as heat Source, had both solved the cryogenic waste heat resource recycling occupying flue gases of cock oven output thermal source 17%, the most significantly Improve the efficiency of coking process utilization of energy degree, break through the traditional coal humidifying technology a large amount of Gao Pin of required consuming The technical bottleneck in potential energy source, significantly improves the benefit of coking industry energy-saving and emission-reduction, safety and economic operation.

The beneficial effects of the utility model are:

1, humidity control device uses the technological process of stage drying step damping so that coal charge humidity is fitted by device Ying Xingguang, can control generation and the elutriation of coal charge dust in order, and energy puts into according to technological process step, is System runing adjustment is reliable, flexible, and energy saving is strong.

2, with thermal conduction study and hydrodynamics Basic Mechanism, the heating working medium of damping machine fluidizes work with fluid bed Matter is respectively adopted two kinds of working medium of hot water and air so that heat-carrying in technological process, carry wet, fluidizing agent separately, Being easy to the energy transmission of system, the operational factor flexible adjustment such as temperature, flow velocity, one is to improve damping machine institute Calorific requirement conversion effective capacity, two is to ensure fluidizing agent flow stability and its wet ability of load.

3, process unit uses built-in heat exchanger, and thermal source adaptability is wider, can be combined by multi-heat source, flexibly, Strong adaptability, adapts to the dry dehumidification of more than 20% high humility coal charge.

4, stagewise is dried and uses different heat exchange modes, and higher to the adaptability of coal charge, heat puts into also More reasonable, reach the energy balance and material balance.

5, this device uses air as fluidizing agent, simply plays coal charge fluidization and carries wet function, Compared with flue gas direct contact type fluid bed moisture control method, the fluidized gas scale of construction is only the 25% of flue tolerance Left and right；The electrical power of fluidized air blower can be reduced, the electricity of 40-50% can be saved.

6, using low temperature low velocity fluidization drying means, dust generation rate controls within 4%, and passes through dedusting Reclaiming pelletize, dust emission concentration is 8.9mg/Nm3, meets minimum discharge.

7, the wet coal of the material in damping machine is in low-temperature heat, is 50 DEG C-85 DEG C and low fluidisation in mean temperature The fluidisation augmentation of heat transfer state of speed 0.5-1.0m/s, improves fluidised coal charge and built-in heat exchanger Heat exchange efficiency, conveying hot-water line radiation loss be conveying flue gas radiation loss 4.65%, therefore from From the standpoint of infrastructure investment and operating cost etc., the heat transfer efficiency of hot water and heat-carrying capacity are far superior to cigarette Road gas.

8, using high-temperature-hot-water is heat-carrying working medium, converted by flue gases of cock oven waste heat, heat-carrying working medium Heat source mainly takes from 190 DEG C-210 DEG C flue gases of cock oven waste heats, is allowed to by flue-gas waste-heat boiler Heat-carrying working medium heat temperature raising.

9, use step screening procedure so that the coal charge over grind of 40%-60% and Repeat-heating.

Accompanying drawing explanation

This utility model will illustrate by example and with reference to the appended drawing, wherein:

Fig. 1 is schematic diagram of the present utility model.

Detailed description of the invention

All features disclosed in this specification, or disclosed all methods or during step, except mutually Beyond the feature repelled mutually and/or step, all can combine by any way.

Any feature disclosed in this specification, unless specifically stated otherwise, all can by other equivalence or have similar The alternative features of purpose is replaced.I.e., unless specifically stated otherwise, each feature is a series of equivalence or class Like an example in feature.

Clean and effective step as shown in Figure 1 sieves built-in fluidized hot bed coal humidity control device, sieves including high-amplitude Machine 1, pulverizer 2, blender 5, fluidized bed type damping machine and flue-gas waste-heat boiler 7, described fluid bed Formula damping machine includes charging aperture 14, discharge gate 20 and fluidized wind exhaust outlet 16,1 point of described high-amplitude screen extension set Not being connected with the charging aperture 14 of pulverizer 2 and fluidized bed type damping machine, pulverizer 2 is connected with blender 5, The discharge gate 20 of fluidized bed type damping machine is also connected with blender 5, and high-amplitude screen 1 screens out less than 3mm grain The coal charge in footpath is directly entered fluidized bed type damping machine, is dried dehumidifying；Coal charge more than more than 3mm particle diameter Enter pulverizer, carry out selective molecular attraction, subsequently into blender, with fluid bed damping machine out the most dry Dry coal charge mixes.Described flue-gas waste-heat boiler 8 is connected with chimney 7 by air-introduced machine 6.At pulverizer 2 Dust outlet and blender 5 between be also sequentially connected with cleaner unit 3 and comminutor 4, fluidized bed type damping The fluidized wind exhaust outlet 16 of machine is connected with cleaner unit 3.

It is provided with attemperator on chute in high-amplitude screen extension set 1, prevents the coal charge downslide process screened out Cohering with cell wall and preliminarily dried, the thermal medium that adds of attemperator uses high-temperature-hot-water, hot water inlet temperature control System is between 150-130 DEG C, and hot water outlet temperature controls between 130-110 DEG C, and material size is at 50mm Hereinafter, screen size 6-12mm, amplitude 15-25mm.

Described fluidized bed type damping machine also includes first paragraph fluidisation air compartment 13 and second segment fluidisation air compartment 21, described Without coll(-tube) heater in first paragraph fluidisation air compartment 13, there is one layer of bed bottom；Second segment fluidisation air compartment 6 Mainly it is made up of some damping modules, in damping module, is provided with coll(-tube) heater；Charging aperture 14 is first The top outer of Duan Liuhua air compartment 13, sets between first paragraph fluidisation air compartment 13 and second segment fluidisation air compartment 21 There is an adjustable overflow plate 12, control to enter into the coal charge of second segment fluidisation air compartment by adjustable overflow plate Flow；First paragraph fluidisation air compartment 13 the most external air preheater 11 and first class blower fan 10, the Two-stage nitration fluidisation external second fluidized air blower 25 of air compartment 21；Fluidized wind exhaust outlet 16 is at fluidized bed type damping machine Top, fluidized wind exhaust outlet 16 is additionally provided with reheater 17, reheater 17 and flue-gas waste-heat boiler 8 Connect；One expansion chamber 18, second segment fluidisation air compartment 21 and sedimentation are arranged at the top in fluidized bed type damping machine For fluidized drying district 19 between room 18.First paragraph fluidisation air compartment 13 and second segment fluidize each of air compartment 21 The bottom of damping module is provided with independent cloth wind cabin, and cloth wind cabin is by air compartment 23, air distribution plate 22 and cloth wind Cap forms；Second fluidized air blower 25 is to each Separate Wind Barn parallel connection air feed, and is all provided with between each cloth wind cabin There is control valve 24.

Be equipped with coll(-tube) heater in described air preheater 11 and reheater 17, air preheater 11 with Flue-gas waste-heat boiler 7 connects, and flue-gas waste-heat boiler 8 gives the coil heating in air preheater 11 Device heat supply, the air vent of air preheater 11 is directly accessed the cloth wind cabin of first paragraph fluidisation air compartment 13.Described Air preheater is used for heating fluidized wind, improves the volume wind speed of fluidized wind and carries wet ability.Air is from first Entering at fluidized air blower, the coal charge fallen by air preheater entrance first paragraph fluidisation air compartment and charging aperture is entered Row for the first time heat convection, the coal charge falling fluidized-bed bottom and the bed that is dried, in fluidisation state heat transfer, enter one Step is dried dehumidification.

This utility model refines standby coal operation according to existing coke making and coal blending technological requirement and material characteristic, Standby coal operation embedded in the screening of coal particle particle diameter step, selective molecular attraction and coal fly ash and reclaim pelletize, i.e. Based on built-in fluidized hot bed damping machine, embed screen and divide and dedusting granulating working procedure composition, use machinery Screening and low temperature speed change fluid bed process achieve coal particle particle diameter and sieve step by step, can be entering in stove coking coal The coal particle of more than 3mm sieves out, it is ensured that coal particle is pulverized, is dried and the orderly control of coal dust, Decrease coal charge and repeat processed and the unreasonable input of energy.

This utility model is not limited to aforesaid detailed description of the invention.This utility model expands to any at this In description disclose new feature or any new combination, and disclose arbitrary new method or the step of process Rapid or any new combination.

Claims (7)

1. a clean and effective step sieves built-in fluidized hot bed coal humidity control device, it is characterized in that: include high-amplitude screen extension set (1), pulverizer (2), blender (5), fluidized bed type damping machine and flue-gas waste-heat boiler (8), described fluidized bed type damping machine includes charging aperture (14), discharge gate (20) and fluidized wind exhaust outlet (16), described high-amplitude screen extension set (1) is connected with the charging aperture (14) of pulverizer (2) and fluidized bed type damping machine respectively, pulverizer (2) is connected with blender (5), the discharge gate (20) of fluidized bed type damping machine is also connected with blender (5), the exhaust outlet (16) of fluidized bed type damping machine is connected with cleaner unit (3).

Clean and effective step the most according to claim 1 sieves built-in fluidized hot bed coal humidity control device; it is characterized in that: being also sequentially connected with cleaner unit (3) and comminutor (4) between the dust outlet and blender (5) of pulverizer (2), the fluidized wind exhaust outlet (16) of fluidized bed type damping machine is connected with cleaner unit (3).

Clean and effective step the most according to claim 1 sieves built-in fluidized hot bed coal humidity control device, it is characterized in that: be provided with chute in high-amplitude screen extension set (1), chute is provided with attemperator.

Clean and effective step the most according to claim 1 sieves built-in fluidized hot bed coal humidity control device, it is characterized in that: described fluidized bed type damping machine includes first paragraph fluidisation air compartment (13) and second segment fluidisation air compartment (21), without coll(-tube) heater in described first paragraph fluidisation air compartment (13), there is one layer of bed bottom；Second segment fluidisation air compartment (21) is mainly made up of some damping modules, is provided with coll(-tube) heater in damping module；

Charging aperture (14) is in the top outer of first paragraph fluidisation air compartment (13), it is provided with an adjustable overflow plate (12) between first paragraph fluidisation air compartment (13) and second segment fluidisation air compartment (21), first paragraph fluidisation air compartment (13) the most external air preheater (11) and first class blower fan (10), second segment fluidizes air compartment (21) external second fluidized air blower (25)；

Fluidized wind exhaust outlet (16), at the top of fluidized bed type damping machine, is additionally provided with reheater (17) in fluidized wind exhaust outlet (16), reheater (17) is connected with flue-gas waste-heat boiler (8)；

One expansion chamber (18) is arranged at the top in fluidized bed type damping machine, for fluidized drying district (19) between second segment fluidisation air compartment (21) and expansion chamber (18).

Clean and effective step the most according to claim 4 sieves built-in fluidized hot bed coal humidity control device, it is characterized in that: in described air preheater (11) and reheater (17), be equipped with coll(-tube) heater, flue-gas waste-heat boiler (8) gives the coll(-tube) heater heat supply in air preheater (11) and reheater (17), and the air vent of air preheater (11) is directly accessed the cloth wind cabin of first paragraph fluidisation air compartment (13).

Clean and effective step the most according to claim 4 sieves built-in fluidized hot bed coal humidity control device, it is characterized in that: the bottom of each damping module of first paragraph fluidisation air compartment (13) and second segment fluidisation air compartment (21) is provided with independent cloth wind cabin, and cloth wind cabin is made up of air compartment (23), air distribution plate (22) and cloth blast cap；Second fluidized air blower (25) is to each Separate Wind Barn parallel connection air feed, and is equipped with control valve (24) between each cloth wind cabin.

Clean and effective step the most according to claim 1 sieves built-in fluidized hot bed coal humidity control device, it is characterized in that: described flue-gas waste-heat boiler (8) is connected with chimney (7) by air-introduced machine (6).