CN104964528B - One utilizes surplus heat of power plant to carry out pre-dried run coal bin to low-order coal - Google Patents
One utilizes surplus heat of power plant to carry out pre-dried run coal bin to low-order coal Download PDFInfo
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- CN104964528B CN104964528B CN201510416538.5A CN201510416538A CN104964528B CN 104964528 B CN104964528 B CN 104964528B CN 201510416538 A CN201510416538 A CN 201510416538A CN 104964528 B CN104964528 B CN 104964528B
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Abstract
The invention discloses one utilizes surplus heat of power plant to carry out pre-dried run coal bin to low-order coal, comprise run coal bin, be horizontally disposed with many places heat exchange mechanisms and for passing into the cigarette wind drier of hot cigarette wind at run coal bin, many places heat exchange mechanisms sets gradually from top to bottom, each heat exchange mechanisms comprises Multi-layer exchanging heat pipe, cigarette wind drier comprises the gas distribution pipe that multiple-layer horizontal is arranged, each heat exchanger tube is perpendicular to gas distribution pipe setting, and gas distribution pipe is dispersed between Multi-layer exchanging heat pipe. The invention has the beneficial effects as follows: unique flue gas drying mechanism has fluidisation, loosening coal seam concurrently and plays to a certain extent anti-blocking effect, reduces for wind pressure, and raw coal blanking is more smooth and easy; Owing to having solved the dry problem of coarsegrain, high-moisture percentage coal from source, the difficulty such as fragmentation and powder process of follow-up raw coal is reduced, thereby reduce on the whole power plant's total energy consumption; And because baking temperature is low, coal granularity is large, there will not be the potential safety hazards such as the dry coal dust explosion easily occurring of coal dust.
Description
Technical field
The present invention relates to one utilizes surplus heat of power plant to carry out pre-dried run coal bin to low-order coal.
Background technology
Low-order coal (for example brown coal), due to high-moisture percentage, makes it utilize scope, utilization ratio and economy to be all subject to very largeImpact. Because brown coal water content is higher, and be distributed in China northeast and southwest, long distance transportation can cause a large amount of transport powerWaste. If brown coal directly burn, wherein large quantity of moisture endothermic gasification, and with fume emission, cause a large amount of latent heat of vaporization losses,Reduce boiler efficiency; And a large amount of steam that directly burning produces, seriously reduce flame temperature, reduce radiation heat transfer,Under identical output condition, high-moisture brown coal increase twice than the radiation heating-surface of low-water-content coal; Meanwhile, large water gaging steamsGas follows flue gas together to get rid of, and has increased flue volume, causes equipment fixed investment to increase, and makes the dehydration before brown coal burningLink is very necessary. Relevant result of study shows, the brown coal that moisture content is 50% directly burn, wherein for self moistureEvaporation and consume energy can account for the more than 20% of its total chemical energy, boiler efficiency is only 65%, and brown coal through dehydration after-combustion,Boiler thermal output can reach more than 82%.
The upgrading of dewatering before utilization of the high humidity coals such as brown coal, not only can significantly improve its calorific value, becomes and has bituminous coal etc.High-order coal characteristic, simultaneously can significantly improve brown coal and utilize the economic performance of process, make full use of its reserves large, bury shallow excellentGesture, for having more strategic importance using brown coal as main energy sources Resources Area. Below no longer distinguish low-order coal, high-moisture percentageThe difference of coal, high humidity coal, can think that meaning is identical.
Research for the dry technology of the fossil fuel such as coal is existing a lot, and most researchers has designed that certain is special dryDrying system or device, because these technologies all need to build independent drying unit or device (hot-blast stove or superheated steamDrying system), not only taken a large amount of places and space, and owing to separately building investment greatly, operating cost is high, and systemComplexity, poor reliability.
Application number is 200520002171 patent of invention, proposed the design of a kind of coal store, enters Stokehole pulverized coal storehouse in traditionThe newly-built a set of heater in lower end, utilizes boiler combustion flue gas to heat to remove moisture wherein to coal dust, its feature:The one, in the Pulverized Coal Bin bottom that enters stokehold, one independent heating unit is set, the blockage problem while its objective is as solution coal breakage,Not want to realize up to standard dry into stove coal, and it is most important how to solve the dry problem of high-moisture percentage coal; The 2nd, general electricityFactory all arranges run coal bin and powder run coal bin, and the former is used for storing raw coal, and granularity is large, and capacity is large, and the latter is for after storing and dryingThe thinner coal dust of granularity, granularity is little, capacity is little. This patent is not considered large particle diameter, high-moisture percentage coal dry of run coal binDry problem, the fine coal that in fact enters Pulverized Coal Bin generally passes through pretreatment, and moisture content is not high, now carries out drying effect againNot obvious; The 3rd, adopt the lower flue gas of temperature to be dried, than the heat source temperature (400-500 DEG C) of general flue gas drying systemMuch lower, and be indirect, and the time of staying of fine coal in the heater of Pulverized Coal Bin and bottom is very short, from heat and massAngle see, drying effect and efficiency are very low; The 4th, because the designing requirement temperature of Pulverized Coal Bin can not exceed 100 DEG C, its propositionFlue-gas temperature obviously exceed this safety limit, easily cause the major accidents such as coal dust detonation, blast, and coarsegrain is formerCoal is much safe.
Summary of the invention
Device provided by the invention has overcome the deficiencies in the prior art, provides one to utilize surplus heat of power plant to carry out in advance low-order coalDry run coal bin, effectively utilizes high-moisture percentage coal in the longer time of staying of run coal bin storage and larger physical space,Enter stokehold at coal it is fully dried, due to drying time long (approximately 8 hours), therefore heat-transfer effect is good, dryEfficiency is higher; And need not newly-built independent drying unit, save space and space, without running gear, reliability is high; This, solve the dry problem of coarsegrain, high-moisture percentage coal from source outward, made the difficulty such as fragmentation and powder process of follow-up raw coalReduce, power consumption significantly declines, and there will not be the potential safety hazards such as the dry coal dust explosion easily occurring of coal dust.
In order to reach above-mentioned purpose, the present invention adopts following technical scheme:
One utilizes surplus heat of power plant to carry out pre-dried run coal bin to low-order coal, comprises run coal bin, is horizontally disposed with many at run coal binPlace's heat exchange mechanisms and for passing into the cigarette wind drier of hot cigarette wind, many places heat exchange mechanisms sets gradually from top to bottom, each heat exchangeMechanism comprises Multi-layer exchanging heat pipe, and cigarette wind drier comprises the gas distribution pipe that multiple-layer horizontal is arranged, each heat exchanger tube is perpendicular to gas distribution pipeArrange, gas distribution pipe is dispersed between Multi-layer exchanging heat pipe, and many places heat exchange mechanisms is set, and passes into high temperature and be situated between in the heat exchange mechanisms at lower placeMatter, passes into cryogenic media or high-temperature medium in the heat exchange mechanisms at upper place, and cigarette wind drier and the staggered cloth of heat exchange mechanismsPut, realize like this heat cascade utilization, be conducive to improve the efficiency of dry run.
Further, heat exchange mechanisms also comprises inlet header and outlet header, and the heat exchanger tube described in multilayer is in described run coal binBe horizontally disposed with, one end of Multi-layer exchanging heat pipe is connected to inlet header jointly, and the other end is connected to outlet header jointly, and multilayer is changedHeat pipe shares an inlet header and same outlet header, the setting of having saved multiple devices.
Further, cigarette wind drier also comprises the air-dry dry inlet header of cigarette, and the air-dry dry inlet header of cigarette is arranged on run coal binOutside, laminates tracheae one end is connected to the air-dry dry inlet header of cigarette jointly, and the other end is arranged in described run coal bin, passes throughLaminates tracheae is set and effectively puies forward high-octane replacement rate.
Further, in heat exchange of top part mechanism, pass into the heat after working-medium water or the economizer heating adopting after desulfurization slurry heat exchangeWater, makes full use of surplus heat of power plant and completes predrying to low-order coal in run coal bin.
Further, in the heat exchange mechanisms of bottom, pass into low pressure (LP) cylinder steam.
Further, at vertical direction, in the gas distribution pipe described in multilayer, between adjacent two layers, the identical distance in interval is arranged on instituteState between heat exchanger tube, gas distribution pipe is disposed between multiple heat exchanger tubes, realizes the reasonable utilization of heat transferring medium heat.
Further, inlet header and outlet header are arranged on the same side outside described run coal bin.
Further, at described heat exchange pipe external surface, finned tube is set, improves drying effect by finned tube.
Further, on gas distribution pipe, have several perforates, above described gas distribution pipe, be provided with for preventing coal dust, coal grainEnter the baffle plate of gas distribution pipe, the circulation of perforate for flue gas is set.
Further, at described run coal bin, heat-insulation layer is set outward, being provided for of heat-insulation layer is incubated run coal bin, favourableIn the heat radiation that reduces run coal bin.
Operation principle of the present invention is: two place's heat exchange mechanisms, the heat exchange mechanisms that is positioned at place passes into cryogenic fluid, under being positioned atIn the heat exchange mechanisms at place, pass into high temperature refrigerant, in the heat exchange mechanisms at upper place, pass into the working-medium water that adopts after desulfurization slurry heat exchange orHot water after economizer heating passes into low pressure (LP) cylinder steam in the heat exchange mechanisms at lower place, to realize the classification utilization of heat, carriesHigh-energy utilization rate. Working medium enters heat exchanger tube from inlet header, and heat is passed to the coal in run coal bin, heat release by heat exchanger tubeAfter the water of having lowered the temperature enter outlet header from heat exchanger tube outlet.
Gas distribution pipe layering in run coal bin in cigarette wind drier is evenly arranged. Thermal source in cigarette wind drier uses empty pre-The hot blast that flue gas after device or boiler pnenmatic slag handling system produce. Flue gas has fluidisation, loosening coal seam concurrently and plays to a certain extentAnti-blocking effect. The cigarette wind of heat is sent into the gas distribution pipe in run coal bin by conveying equipment through the air-dry dry inlet header of cigarette, uniformlyEnter run coal bin, the low-order coal direct contact heat transfer with in run coal bin, carries out heat drying to coal. The heating of low-order coal process,Wherein contained humidity is evaporated to steam, and the cigarette wind that this part steam is passed into carries, by the cigarette wind passage in run coal bin,Lead to the space on run coal bin top, discharge the gas outlet arranging through run coal bin top, and the fume environment protection that enters boiler unit is administeredFacility entrance jointly discharges with flue gas after purifying.
The invention has the beneficial effects as follows:
(1) utilize power station low temperature exhaust heat to be dried the coarsegrain in run coal bin, high-moisture percentage raw coal, do not affecting raw coalUnder the condition of the normal operation in storehouse, coal drying process is carried to run coal bin and being carried out, be different from shorter conventional drying work of timeSkill, because ensure long drying time, therefore in run coal bin, heat and mass efficiency is high, and coal drying is effective. Can economy closeReason ground improves into stove ature of coal, has both made full use of the waste heat of power plant periphery, as the heat of hot flue gas, low-pressure steam, pnenmatic slag handling systemWind etc., the environmental pollution of having saved the expensive investment of special newly-built former coal drying system and operating cost simultaneously and may bring,Also save power plant's floor space, and run coal bin movement-less part, reliability is high.
(2) raw coal in run coal bin is carried out to hot cigarette wind, hot water (water vapour) combined drying, realized opening up of residual heat of electric power plantExhibition and comprehensive utilization, avoided the restriction of single drying mode, makes system more flexible. And adopt classification heating and stepDry, can make full use of the energy level that different temperatures thermal source has, high temperature heat source (low pressure (LP) cylinder steam) heating high temperature substrateMaterial, low-temperature heat source (hot water) heating low-temperature material, realizes heat cascade utilization, is conducive to improve the efficiency of dry run,And and then improve the thermal efficiency of unit entirety.
(3) unique flue gas drying mechanism has fluidisation, loosening coal seam concurrently and plays to a certain extent anti-blocking effect, reducesFor wind pressure, the run coal bin that therefore installs drying unit additional than conventional coal sample is compared, and raw coal blanking is more smooth and easy.
(4), owing to having solved the dry problem of coarsegrain, high-moisture percentage coal from source, make the broken and system of follow-up raw coalThe difficulty such as powder reduce, and therefore the power consumption of these links significantly declines, thereby reduces on the whole power plant's total energy consumption; And due to dryDry temperature is low, coal granularity is large, there will not be the potential safety hazards such as the dry coal dust explosion easily occurring of coal dust.
Brief description of the drawings
Fig. 1 is the front view of run coal bin in the present invention;
Fig. 2 is the side view of run coal bin in the present invention;
Fig. 3 is the cutaway view of A-A in Fig. 2 of the present invention;
Wherein: 1 is run coal bin, 2 for cryogenic fluid inlet header, 3 for high temperature refrigerant inlet header, 4 for cigarette air-dry dry enterMouth header, 5 is that gas distribution pipe, 6 is for heat exchanger tube, 7 is for cryogenic fluid outlet header, 8 is for high temperature refrigerant outlet header, 9 is for doingDry wind outlet, 10 is dry wind entrance.
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, completeDescribe.
Fig. 1 is the front view of run coal bin in the present invention, and in figure, one utilizes surplus heat of power plant to carry out pre-dried run coal bin to low-order coal,Comprise that bottom arranges the run coal bin 1 of support, be horizontally disposed with two place's heat exchange mechanisms and air-dry for passing into the cigarette of hot cigarette wind at run coal bin 1Dry mechanism, two place's heat exchange mechanisms are successively set on the upper middle part of run coal bin 1 from top to bottom, and heat exchange mechanisms comprises Multi-layer exchanging heat pipe 6,Cigarette wind drier comprises the gas distribution pipe 5 that multiple-layer horizontal is arranged, heat exchanger tube 6 arranges perpendicular to gas distribution pipe 5, and gas distribution pipe 5 is dispersed inBetween Multi-layer exchanging heat pipe 6, at vertical direction, in the gas distribution pipe 5 described in multilayer, between adjacent two layers, the identical distance in interval is arranged onBetween described heat exchanger tube 6, gas distribution pipe 5 and heat exchanger tube 6 are crisscross arranged.
Fig. 2 is the side view of run coal bin in the present invention; Fig. 3 is the cutaway view of A-A in Fig. 2 of the present invention; As we know from the figure, raw coal1 cross section, storehouse is circle or square structure, and top is regular circle or square structure, and bottom is reducing shape, and low-order coal storesIn warehouse, because of the structure of run coal bin 1, upper end diameter is larger, therefore the superiors' gas distribution pipe 5 is arranged to two, the gas distribution of belowManage 5 every layer arrange one. Heat-exchanging component through reasonable Arrangement is arranged in warehouse, does not affect normal coal storage and blanking; FormerThe outer heat-insulation layer that arranges of coal bunker 1, for run coal bin 1 is incubated, is conducive to reduce the heat radiation of run coal bin 1, improves heat energy utilizationEfficiency.
Heat exchange mechanisms comprises inlet header, Multi-layer exchanging heat pipe 6 and outlet header, and alternatively, Multi-layer exchanging heat pipe 6 is described formerIn coal bunker 1, be horizontally disposed with, or straight line runs through inside and outside run coal bin 1, one end of Multi-layer exchanging heat pipe 6 is connected to import connection jointlyCase, the other end is connected to outlet header jointly, at heat exchange pipe external surface, finned tube is set. The heat exchanger tube two ends at lower place connect highTemperature working medium inlet header 3 and high temperature refrigerant outlet header 8, heat exchanger tube 6 two ends at upper place connect cryogenic fluid inlet header 2 HesCryogenic fluid outlet header 7.
Cigarette wind drier comprises the air-dry dry inlet header 4 of cigarette and laminates tracheae 5, and the air-dry dry inlet header 4 of cigarette is arranged on formerCoal bunker 1 outside, laminates tracheae 5 one end are connected to the air-dry dry inlet header of cigarette jointly, and the other end is arranged on described run coal bin 1In, the air-dry dry inlet header of cigarette is horizontally disposed with dry wind entrance 10 outward. On gas distribution pipe 5, vertically have several perforates, in instituteState gas distribution pipe 5 tops and be provided with for preventing that coal dust, coal grain from entering the baffle plate of gas distribution pipe, it is low that the arranging of gas distribution pipe 5 metRank coal is dried, prevents the effect of coal arch camber, obstruction, has reduced for wind pressure simultaneously; After cigarette wind flows out from gas distribution pipe 5,Go out from be arranged on the dry wind outlet of run coal bin 1 top by cigarette wind passage, enter boiler flue gas purification system belowDischarge after purifying.
Inlet header and outlet header are arranged on the same side outside run coal bin 1, and one end of heat exchanger tube 6 connects inlet header,Heat exchanger tube 6 is round run coal bin 1 one circles or after run coal bin 1, be connected to outlet header with the arranged in form of straight line. Heat exchangeManage 6 outer surfaces and can install finned tube additional, improve drying effect, can as required heat exchanger tube 6 be arranged to difformity, canBeing square, circular; According to the interior coal blanking of warehouse 1 situation, heat exchanger tube 6 can be also light pipe, can reduce flow resistance.
Enter raw coal before boiler milling system and be stored in run coal bin in order to using, meanwhile, run coal bin 1 is as low-order coalDry place; Raw coal can be the low-order coal of high-moisture percentage, as brown coal, can be also that other moisture content do not meet power plant's requirementCoal.
The drying source of low-order coal comes from the waste heat of boiler unit, Ke Yiwei:
1) working-medium water after desulfurization slurry heat exchange, refers to the heat recirculated water heat energy upgrading of wet process of FGD being generated by heat pumpWater;
2) water after low-level (stack-gas) economizer heating;
3) low pressure (LP) cylinder steam;
4) flue gas after air preheater (air preheater);
5) hot blast of pnenmatic slag handling system, refers to that boiler bottom slag uses hot-air cooling produced when dry bottom ash handling system etc.
In the heat exchange mechanisms at upper place, pass into the hot water after working-medium water or the economizer heating adopting after desulfurization slurry heat exchange.
In the heat exchange mechanisms at lower place, pass into low pressure (LP) cylinder steam; Or in two place's heat exchange mechanisms, all pass into the working medium of higher temperature.
Two place's heat exchange mechanisms, the heat exchange mechanisms that is positioned at place passes into cryogenic fluid, and the heat exchange mechanisms that is positioned at lower place passes into heightTemperature working medium passes into the hot water after working-medium water or the economizer heating adopting after desulfurization slurry heat exchange in the heat exchange mechanisms at upper place,In the heat exchange mechanisms at lower place, pass into low pressure (LP) cylinder steam, to realize the classification utilization of heat, improve capacity usage ratio. Working medium fromInlet header enters heat exchanger tube 6, and heat is passed to the coal in run coal bin 1 by heat exchanger tube, and the water of having lowered the temperature after heat release is from heat exchangePipe outlet enters outlet header, then turns back in duplex matter system.
Gas distribution pipe 5 layering in run coal bin in cigarette wind drier is evenly arranged. Thermal source in cigarette wind drier uses emptyThe hot blast that flue gas after pre-device or boiler pnenmatic slag handling system produce. Flue gas has fluidisation, loosening coal seam concurrently and rises to a certain extentTo anti-blocking effect. The cigarette wind of heat is sent into the gas distribution pipe in run coal bin by conveying equipment through the air-dry dry inlet header of cigarette, evenlyEnter run coal bin 1, the low-order coal direct contact heat transfer with in run coal bin 1, carries out preheating and drying to coal. Low-order coal is through addingHeat, wherein contained humidity part is evaporated to steam, and the cigarette wind that this part steam is passed into carries, in run coal bin 1Cigarette wind passage, lead to the space on run coal bin 1 top, discharge the gas outlet arranging through run coal bin 1 top, enters boiler machineThe fume environment protection treatment facility entrance of group jointly discharges with flue gas after purifying.
The above is only the preferred embodiment of the present invention, it should be pointed out that for those skilled in the artSay, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be lookedFor protection scope of the present invention.
Claims (10)
1. utilize surplus heat of power plant to carry out a pre-dried run coal bin to low-order coal, it is characterized in that, comprise formerCoal bunker, is horizontally disposed with many places heat exchange mechanisms and for passing into the cigarette wind drier of hot cigarette wind, many places at run coal binHeat exchange mechanisms sets gradually from top to bottom, and each heat exchange mechanisms comprises Multi-layer exchanging heat pipe, and cigarette wind drier comprises manyThe horizontally disposed gas distribution pipe of layer, each heat exchanger tube is perpendicular to gas distribution pipe setting, gas distribution pipe be dispersed in Multi-layer exchanging heat pipe itBetween; In the heat exchange mechanisms at lower place, pass into high-temperature medium, in the heat exchange mechanisms at upper place, pass into cryogenic media or high temperatureMedium, cigarette wind drier and heat exchange mechanisms interlaced arrangement.
2. run coal bin as claimed in claim 1, is characterized in that, described heat exchange mechanisms also comprises import connectionCase and outlet header, the heat exchanger tube described in multilayer is horizontally disposed with in described run coal bin, one end of Multi-layer exchanging heat pipeJointly be connected to inlet header, the other end is connected to outlet header jointly.
3. run coal bin as claimed in claim 1, is characterized in that, described cigarette wind drier also comprises cigaretteAir-dry dry inlet header, the air-dry dry inlet header of cigarette is arranged on run coal bin outside, the gas distribution pipe one end described in multilayerJointly be connected to the air-dry dry inlet header of cigarette, the other end is arranged in described run coal bin.
4. run coal bin as claimed in claim 1, is characterized in that, logical in described heat exchange of top part mechanismEnter to adopt the hot water after working-medium water or the economizer heating after desulfurization slurry heat exchange.
5. run coal bin as claimed in claim 1, is characterized in that, logical in described bottom heat exchange mechanismsEnter low pressure (LP) cylinder steam.
6. run coal bin as claimed in claim 1, is characterized in that, at vertical direction, and the cloth described in multilayerIn tracheae, between adjacent two layers, the identical distance in interval is arranged between described heat exchanger tube.
7. run coal bin as claimed in claim 2, is characterized in that, described inlet header and outlet header are establishedPut the same side outside described run coal bin.
8. run coal bin as claimed in claim 1, is characterized in that, at described heat exchange pipe external surface, wing is setSheet pipe.
9. run coal bin as claimed in claim 1, has several perforates, at described cloth on described gas distribution pipeTracheae top is provided with for preventing that coal dust, coal grain from entering the baffle plate of gas distribution pipe.
10. run coal bin as claimed in claim 1, arranges heat-insulation layer outward at described run coal bin.
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| CN105689074A (en) * | 2016-03-19 | 2016-06-22 | 福建将乐天马生物质能源有限公司 | Coal drying-crushing-screening integrated system |
| CN106052308B (en) * | 2016-06-15 | 2018-11-13 | 成都昊特新能源技术股份有限公司 | A kind of drying system and drying means using steam turbine steam exhaust |
| CN107140706A (en) * | 2017-06-08 | 2017-09-08 | 江苏新奇环保有限公司 | A kind of low temperature and high concentration sewage disposal vaporization chamber distribution device |
| CN110631039A (en) * | 2019-10-08 | 2019-12-31 | 雷迎谦 | Industrial waste gas heat energy recycling device |
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| CN2694125Y (en) * | 2003-12-30 | 2005-04-20 | 电站锅炉煤清洁燃烧国家工程研究中心 | Slime smoke drying device for power station boiler |
| CN102155744B (en) * | 2010-12-22 | 2012-11-14 | 上海锅炉厂有限公司 | System for pre-drying coal with high water content by utilizing residual heat of boiler gas |
| CN102353237B (en) * | 2011-08-18 | 2013-12-11 | 西安交通大学 | High-moisture-content lignite predrying method and system integrated with thermal power plant |
| CN203687545U (en) * | 2013-12-06 | 2014-07-02 | 苏杰 | Lignite water extraction and recovery system utilizing waste heat generated by power plant to carry out drying |
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Address after: 250061, No. ten, No. 17923, Lixia District, Ji'nan City, Shandong Province Patentee after: SHANDONG University Patentee after: Guoneng (Shandong) energy environment Co.,Ltd. Patentee after: QINGDAO DANENG ENVIRONMENTAL PROTECTION EQUIPMENT INCORPORATED Co. Address before: 250061, No. ten, No. 17923, Lixia District, Ji'nan City, Shandong Province Patentee before: SHANDONG University Patentee before: SHANDONG SHENHUA SHANDA ENERGY ENVIRONMENTAL Co.,Ltd. Patentee before: QINGDAO DANENG ENVIRONMENTAL PROTECTION EQUIPMENT INCORPORATED Co. |
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