CN102425931B - A gas-material separation type flue gas diversion distribution method and device - Google Patents
A gas-material separation type flue gas diversion distribution method and device Download PDFInfo
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- CN102425931B CN102425931B CN201110324311.XA CN201110324311A CN102425931B CN 102425931 B CN102425931 B CN 102425931B CN 201110324311 A CN201110324311 A CN 201110324311A CN 102425931 B CN102425931 B CN 102425931B
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Abstract
本发明涉及一种气料分离型烟气导流分配方法及装置，通过在烟气入口管处设烟气导流板，将烟气导流至烟气输送段，并在烟气输送段与颗粒煤收集仓交接处形成低速操作区，实现颗粒料从气体中分离沉降，即进入此区域的颗粒煤在气流低速及边壁效应的双重作用下，会穿过该区域落入颗粒煤收集仓底部集结；烟气出口管为分风室结构，沿着与烟气出口管相连接的流化床进出煤料行进路线，根据原料煤在这个路线不同段干燥情况不同的特点，分风室满足不同湿度、不同粒径的煤料对起始流化速度的不同需要；各分风室烟气的压力、流量通过烟气分配调节阀组调节。优点是不仅可以均布气流，还可以将混入输送气流中的颗粒煤料从气流中迅速分离出来，通过密闭排灰设备，将分离出来的煤料迅速排出。
The present invention relates to a gas-material separation type flue gas diversion distribution method and device, by arranging a flue gas diversion plate at the flue gas inlet pipe, the flue gas is diverted to the flue gas conveying section, and a low-speed operation area is formed at the intersection of the flue gas conveying section and the particle coal collection bin, so as to realize the separation and sedimentation of particle materials from the gas, that is, the particle coal entering this area will pass through the area and fall into the bottom of the particle coal collection bin under the dual effects of the low air flow speed and the side wall effect; the flue gas outlet pipe is a wind chamber structure, along the fluidized bed connected to the flue gas outlet pipe, the coal material travel route in and out, according to the different drying conditions of the raw coal in different sections of this route, the wind chamber meets the different requirements of the coal materials with different humidity and different particle sizes for the initial fluidization speed; the pressure and flow of the flue gas in each wind chamber are adjusted by the flue gas distribution regulating valve group. The advantage is that it can not only evenly distribute the airflow, but also quickly separate the particle coal material mixed in the conveying airflow from the airflow, and quickly discharge the separated coal material through the closed ash discharge equipment.
Description
Technical field
The present invention relates to a kind of Conveyance type flue gas flow guide distribution method and device, be mainly used in take fluid bed in drying equipment coal moisture control process system, for realizing dry being uniformly distributed with air-flow of wet coal charge on fluid bed, also can the particulate coal falling after rise in fluid bed to flue gas transportation section is effectively separated from air-flow, avoid system fan to cause damage.This device also can be used for other and air-flow is distributed with to the technique of high requirement.
Background technology
The operation principle of the coal conditioning technique general using fluid bed that the coke oven flue waste gas of take is thermal source, makes hot flue gas and wet feed coal direct contact heat transfer in coal damping machine, and coal charge is dried.The coal humidity controlling system that the fluid bed of take is coal drying equipment has following feature:
1, coal damping machine processing feed coal amount is larger, and single device disposal ability maximum can reach 350t/h;
2, feed coal water capacity is larger, up to 14%.Coal damping heating agent used is coke oven flue waste gas, and approximately 210 ℃～230 ℃ of coke oven chimney root flue-gas temperatures, after long-distance is carried, are generally 180 ℃～200 ℃ for the stack gases temperature of coal damping.Because heat medium temperature is relatively low, so it is larger to remove the required flue tolerance of the moisture content of coal of unit mass;
3, coal charge particle diameter is different, and water capacity is different, and its operation fluidizing velocity is also different.For meeting the coal charge of different-grain diameter, all can reach the object of even damping in fluid bed, need certain operation fluidizing velocity, this operation fluidisation is not too high, so fluid bed sectional area ratio is larger;
4, fluid bed is distributed with higher requirement to air-flow.Along the direct of travel of coal charge turnover fluid bed, the humidity of feed coal has greatly changed along with the carrying out of damping, and the required minimum fluidizing velocity of different travel segment coal charges is also different;
5, flue gas and coal charge direct contact heat transfer in fluid bed, when flue gas operation fluidizing velocity is during lower than the final Sedimentation Velocity of some particle grade coal charge, these coal charges can Returning flow distribution grids surface, and some fine-particle coal is under the effect of wall effect, also can Returning flow distribution grid surface.In these coal charges, there are some coal charges to enter air-flow transportation section, fluid bed bottom through airflow-distribution board.Because air-flow transportation section, bottom is connected with fan outlet, the existence of these coal particles certainly will cause potential safety hazard to fan operation.
The field distribution of fluid bed gas is uneven, easily causes fluid bed to occur channel, rises the phenomenons such as stream, causes fluid bed to occur dead bed or " piston flow ", makes fluid bed cannot work or affect coal drying effect, affects service life of equipment.
Summary of the invention
The object of this invention is to provide a kind of Conveyance type flue gas flow guide distribution method and device, the method and device not only can be realized uniform air-flow, the coal particle of sneaking in delivery air can also be effectively separated from air-flow, avoid system fan to cause damage, isolated coal particle is discharged by airtight ash discharge equipment.
For achieving the above object, the present invention is achieved through the following technical solutions:
A kind of Conveyance type flue gas flow guide distribution method, at smoke inlet pipe, place arranges smoke deflector, fan outlet air-flow is carried out to water conservancy diversion, air-flow through smoke deflector enters steady air flow section through flue gas transportation section, after steady air flow section steady air flow, counterpressure, enter each separating chamber in flue gas dispensing section, the pressure of each separating chamber flue gas, flow distribute control valve group to regulate by flue gas; The setting of deflector, forms low-speed handing district in flue gas transportation section and particulate coal collecting bin junction, can realize in particulate material Gai region separate and subside from gas; On a small quantity from the feed coal moving downward through fluidized bed airflow distribution grid in fluid bed, by each separating chamber of smoke outlet tube, fall into flue gas transportation section, enter the particulate coal in this region under the double action of air-flow low speed and wall effect, can fall into particulate coal collecting bin through this region, in particulate coal collecting bin bottom, assemble.
Conveyance type flue gas diversion distribution device, this device comprises flue gas diversion section, steady air flow section, flue gas dispensing section and particulate coal collection section, flue gas diversion section comprises smoke deflector, flue gas transportation section, smoke deflector is arranged on smoke inlet pipe place, and smoke deflector is along the setting that is inclined upwardly of flow of flue gas direction; Particulate coal collection section is ash silo formula structure, and particulate coal collecting bin is positioned at the bottom of device; The top of particulate coal collection section is flue gas transportation section and steady air flow section, and steady air flow section arranges the flase floor of a plurality of steady air flows, counterpressure; Steady air flow section top is flue gas dispensing section, and flue gas dispensing section is provided with a plurality of separating chambers, and each separating chamber is equipped with and regulates the flue gas of each separating chamber pressure, flow to distribute control valve group.
Described flue gas distributes control valve group to consist of valve plate, valve body driving shaft, valve body driven shaft, crank, valve body driving shaft and valve body driven shaft are occlusion structure, valve body driving shaft one end is provided with the crank of can motorized motions or manually controlling, and valve plate is opposite opened structure, is fixed on valve body driven shaft.
Described flue gas dispensing section is provided with flue gas flow and pressure measuring unit.
Described particulate coal collection section is provided with upper limit level-sensing device and lower-limit change level indicator, the upper and lower spacing signal of upper limit level-sensing device and lower-limit change level indicator and corresponding airtight ash discharge equipment interlocking.
Compared with prior art, the invention has the beneficial effects as follows:
1) smoke inlet place is provided with smoke deflector, can carry out water conservancy diversion to smoke inlet place air-flow; Flue gas after water conservancy diversion enters flue gas transportation section and steady air flow section, in steady air flow section, establishes flase floor, steady air flow, counterpressure;
2) press the direct of travel of coal charge from fluid bed entrance to outlet, according to coal charge degree of drying, separating chamber is set, at each separating chamber, air quantity and pressure-regulating device are set simultaneously.By these measures, can meet the different requirements of different humidity coal charge to minimum fluidizing velocity, realize even, the highly effective drying damping of coal charge in fluid bed;
3) by the guide functions of smoke deflector, air-flow moves upward; There is a small part coal particle through fluidized bed airflow distribution grid, by Conveyance type flue gas diversion distribution device distribution of air flow section, steady air flow section, fall back to flue gas transportation section, because the junction of flue gas transportation section and particulate coal collecting bin is low-speed handing district, Gai region, coal particle is under Action of Gravity Field, efficient separated from flue gas, and be deposited to bottom particulate coal collecting bin, by airtight device for discharging, discharge flue gas transportation section, effectively avoid coal particle to work the mischief to fluid bed blower fan, eliminate safe hidden trouble.
4) at flue gas dispensing section, establish flue gas flow and pressure measuring unit, by flue gas flow, the pressure data of scope, can facilitate, regulate timely each separating chamber flue gas to distribute control valve group valve opening, make working condition pressure and the flue gas flow of each separating chamber meet fluid bed need of work, improve equipment operating efficiency;
5) at particulate coal collecting bin, establish the upper limit, lower-limit change level indicator, when upper limit level-sensing device sends material level upper limit alarm signal, interlocked startup particulate coal exports the ash discharge of airtight ash discharge equipment, when sending lower limit material level alarm signal, the airtight ash discharge equipment of interlocking close, can shorten ash discharge operation hours, extension device service life.
Accompanying drawing explanation
Fig. 1 is structural front view of the present invention.
Fig. 2 is structure side view of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated:
See Fig. 1, Fig. 2, Conveyance type flue gas flow guide distribution method and device, be mainly used in coal moisture control process system, for realizing dry being uniformly distributed with air-flow of wet coal charge on fluid bed, also can the particulate coal falling after rise from fluid bed to flue gas transportation section is effectively separated from air-flow, avoid system fan to cause damage.This device also can be used for other process system and air-flow is distributed with to the technique of high requirement.
While moving in coal moisture control process system, smoke inlet pipe 4 is connected with fan outlet tube, and smoke outlet tube 5 is connected with fluidized bed smoke inlet tube, and particulate coal outlet 10 is connected with airtight discharge device.
A type flue gas flow guide distribution method, by establishing smoke deflector at smoke inlet pipe place, carries out water conservancy diversion to fan outlet air-flow, and by steady air flow section steady air flow, counterpressure; By deflector is set, can form low-speed handing district in flue gas transportation section and particulate coal collecting bin junction, realize particulate material separate and subside from gas.On a small quantity from the feed coal moving downward through fluidized bed airflow distribution grid in fluid bed, by each separating chamber of smoke outlet tube, fall into flue gas transportation section, enter the particulate coal in this region under the double action of air-flow low speed and wall effect, can fall into particulate coal collecting bin through this region, in particulate coal collecting bin bottom, assemble; Smoke outlet tube is separating chamber structure, along the fluid bed turnover coal charge course being connected with smoke outlet tube, according to feed coal, in the different feature of this route different section drying regime, separating chamber meets the different needs of the coal charge of different humidity, different-grain diameter to minimum fluidizing velocity; The pressure of each separating chamber flue gas, flow distribute control valve group to regulate by flue gas.
Conveyance type flue gas diversion distribution device, comprise flue gas diversion section, steady air flow section, flue gas dispensing section and particulate coal collection section, flue gas diversion section comprises smoke deflector 2, flue gas transportation section 7, smoke deflector 2 is arranged at smoke inlet pipe 4 places, and smoke deflector 2 is along the setting that is inclined upwardly of flow of flue gas direction; Particulate coal collection section is ash silo formula structure, and particulate coal collecting bin 3 is positioned at the bottom of device; The top of particulate coal collection section is flue gas transportation section 7 and steady air flow section 13, and flue gas transportation section 7 is connected with smoke deflector 2 exhanst gas outlet sides and steady air flow section 13, and steady air flow section 13 arranges the flase floor of a plurality of steady air flows, counterpressure; Steady air flow Duan13 top is flue gas dispensing section, and flue gas dispensing section is provided with a plurality of separating chambers, and each separating chamber is equipped with and regulates the flue gas of each separating chamber pressure, flow to distribute control valve group 1.
Smoke outlet tube is separating chamber structure, along the fluid bed turnover coal charge course being connected with smoke outlet tube, according to feed coal, in the different feature of this route different section drying regime, separate air compartment, meet the different needs of the coal charge of different humidity, different-grain diameter to minimum fluidizing velocity; At each separating chamber flue gas, distribute control valve group top to establish flue gas flow and piezometry equipment, by observation sensing equipment determination data, can adjust in time each separating chamber control valve opening, meet each separating chamber different pressures, traffic requirement.
In equipment when operation,, be delivered to smoke inlet pipe 4 from the coke oven flue waste gas of fan outlet, after smoke deflector 2 water conservancy diversion in being arranged on smoke inlet pipe 4, enters flue gas transportation section 7.Steady air flow section 13 is established at 7 tops, flue gas transportation section, establishes grating board structure layer in steady air flow section 13, and through the flue gas of smoke deflector 2 water conservancy diversion, after flue gas transportation section 7 and steady air flow section 13, air-flow tends towards stability, equilibrium.Air-flow, after stable, enter flue gas and distributes control valve group 1 to carry out flue gas distribution.According to the numerical value of flue gas pressures and flow rate-measuring device 6 mensuration, regulate flue gas to distribute each separating chamber control valve opening in control valve group 1, the pressure of each separating chamber and Flow-rate adjustment to the coal charge of fluid bed different moisture levels and particle diameter is carried out to the needed parameter value of initial fluidisation, and the flue gas through overregulating is delivered to smoke outlet tube 5, and be delivered to fluidized bed airflow distribution grid bottom by smoke outlet tube 5, for coal charge fluidization drying apparatus.There is the feed coal in a small amount of fluid bed to pass fluidized bed airflow distribution grid, by smoke outlet tube 5 each separating chambers, fall into flue gas transportation section 7.In flue gas transportation section 7 with particulate coal collecting bin 3 junctions be low-speed handing district, enter the particulate coal in this region under the double action of air-flow low speed and wall effect, can fall into through this region the zone of silence of particulate coal collecting bin 3 bottoms, and assemble in particulate coal collecting bin 3 bottoms.The coal charge that collect particulate coal collecting bin 3 bottoms reach a certain height, the upper limit level-sensing device 8 that is located at particulate coal collecting bin 3 sidewalls can send upper limit material level alarm signal, the airtight ash discharge equipment ash discharge that interlocked startup is connected with particulate coal outlet 10 simultaneously, treat coal particle to drain into down in limited time, lower-limit change level indicator 9 can send alarm signal, simultaneously the airtight ash discharge equipment of interlocking close.
Along feed coal from entrance, enter fluid bed to flow out the traveling distance of fluid bed from outlet, different drying regimes according to feed coal at this each section of distance, smoke outlet tube 5 is separated into a plurality of separating chambers, flue gas distributes the valve of control valve group 1 also at each separating chamber, to arrange, to meet the different needs of the coal charge of different humidity, different-grain diameter to minimum fluidizing velocity.
By flue gas transportation section inspection door 11 and particulate coal collecting bin inspection door 12 are set, can maintain easily, overhaul relevant device.
Flue gas distributes each control valve of control valve group 1 to form by the control valve valve plate 16 of splitting, and control valve valve plate 16 is fixed on regulation valve body driven shaft 15, and regulation valve body driving shaft 14 drives 15 actions of regulation valve body driven shaft by interlock mode.Control valve driving shaft 14 establishes control valve crank 17 in one end, can drive control valve crank 17 by manual or electronic mode, drives 14 operations of regulation valve body driving shaft.
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Patent Citations (7)
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| CN1751811A (en) * | 2005-08-26 | 2006-03-29 | 杨国华 | Dry type gradation equipment for coal |
| DE102007057220A1 (en) * | 2007-07-25 | 2009-05-28 | Udo Cyrol | Mechanism for actuating dampers, valves and other devices subjected to supply and retention torque |
| CN101726172A (en) * | 2008-10-14 | 2010-06-09 | 石建明 | Drier wind-homogenizing device |
| FR2941389A1 (en) * | 2009-01-29 | 2010-07-30 | Fives Fcb | SELECTIVE GRANULOMETRIC SEPARATION DEVICE FOR SOLID PULVERULENT MATERIALS WITH CENTRIFUGAL ACTION AND METHOD OF USING SUCH A DEVICE |
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