CN104964528A - Raw coal bunker for conducting pre-drying on low-rank coal through waste heat of power station - Google Patents
Raw coal bunker for conducting pre-drying on low-rank coal through waste heat of power station Download PDFInfo
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Abstract
The invention discloses a raw coal bunker for conducting pre-drying on low-rank coal through waste heat of a power station. The raw coal bunker comprises a raw coal bunker body, a plurality of heat exchange mechanisms and a smoke air drying mechanism used for leading in hot smoke air are arranged on the raw coal bunker body horizontally, and the multiple heat exchange mechanisms are sequentially arranged from top to bottom; each heat exchange mechanism comprises a plurality of layers of heat exchange pipes, the smoke air drying mechanism comprises a plurality of layers of horizontally-distributed air distribution pipes, the heat exchange pipes are arranged in the mode of being vertical to the air distribution pipes, and the air distribution pipes are dispersed between the multiple layers of heat exchange pipes. The raw coal bunker has the advantages that the unique smoke air drying mechanism has the effects of fluidifying and loosening coal seams and achieving blocking prevention to a certain degree, the air supply pressure is reduced, and raw coal blanking is more smooth; as the aim of drying large-granularity high-moisture-content coal is achieved from a source, the difficulty of follow-up breaking, powder manufacturing and the like of the raw coal is reduced, and the total energy consumption of a power plant is reduced wholly; in addition, as the drying temperature is low, and the coal granularity is large, potential safety hazards like braize explosion easily occurring in the braize drying process are avoided.
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 (such as brown coal), due to high-moisture percentage, makes it utilize scope, utilization ratio and economy to be all greatly affected.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 power to waste.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 to lose, reduce boiler efficiency; And a large amount of steam of directly burning generation, 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, a large amount of steam is together got rid of with flue gas, increases flue volume, causes equipment fixed investment to increase, and the dehydration link before brown coal are burnt is very necessary.Relevant result of study display, moisture content be 50% brown coal directly burn, the energy wherein consumed for the evaporation of self moisture can account for more than 20% of its total chemical energy, and boiler efficiency is only 65%, and brown coal are through dehydration after-combustion, boiler thermal output can reach more than 82%.
The high humidity coals such as brown coal carry out dehydration upgrading before utilization, not only can significantly improve its calorific value, become the high-order coal characteristics such as there is bituminous coal, significantly can improve the economic performance that brown coal utilize process simultaneously, make full use of its reserves large, bury shallow advantage, have more strategic importance for using brown coal as main energy sources Resources Area.Hereafter no longer distinguish the difference of low-order coal, high-moisture percentage 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, most researchers devises certain special drying system or device, because these technologies all need to build independent drying unit or device (hot-blast stove or superheat steam drying system), not only occupy a large amount of places and space, and it is large owing to separately building investment, operating cost is high, and system complex, poor reliability.
Application number is the patent of invention of 200520002171, propose the design of a kind of coal store, the newly-built a set of heater in lower end in Stokehole pulverized coal storehouse is entered in tradition, boiler combustion flue gas is utilized coal dust to be heated to the moisture removed wherein, its feature: one is arrange an independent heating unit in the Pulverized Coal Bin bottom entering stokehold, its objective is the blockage problem for solving during coal breakage, not want the drying up to standard realizing as-fired coal, and the dry problem how solving high-moisture percentage coal is most important; Two is that general power plant 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 used for the thinner coal dust of the granularity after storing and drying, and granularity is little, and capacity is little.This patent does not consider the Large stone of run coal bin, the dry problem of high-moisture percentage coal, and in fact enter the fine coal of Pulverized Coal Bin generally through pretreatment, moisture content is not high, and it is not obvious now to carry out drying effect again; Three is adopt the lower flue gas of temperature to carry out drying, more much lower than the heat source temperature (400-500 DEG C) of general flue gas drying system, and be indirect, and the time of staying of fine coal in the heater of Pulverized Coal Bin and bottom is very short, from the angle of heat and mass, drying effect and efficiency are very low; Four is that its flue-gas temperature proposed obviously exceeds this safety limit, easily causes the major accidents such as coal dust detonation, blast, and the raw coal of coarsegrain is then much safe because the designing requirement temperature of Pulverized Coal Bin can not more than 100 DEG C.
Summary of the invention
Device provided by the invention overcomes the deficiencies in the prior art, providing one utilizes surplus heat of power plant to carry out pre-dried run coal bin to low-order coal, effectively utilize high-moisture percentage coal in the longer time of staying that run coal bin stores and larger physical space, enter stokehold at coal and abundant drying is carried out to it, due to drying time long (about 8 hours), therefore heat-transfer effect is good, and drying efficiency is higher; And need not newly-built independent drying unit, save space and space, without running gear, reliability is high; In addition, solve the dry problem of coarsegrain, high-moisture percentage coal from source, the difficulty such as the fragmentation of follow-up raw coal and powder process are reduced, and power consumption significantly declines, and there will not be the potential safety hazards such as the dry coal dust explosion easily occurred 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, comprise run coal bin, many places heat exchange mechanisms and the cigarette wind drier for passing into hot cigarette wind is horizontally disposed with 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 arranged perpendicular to gas distribution pipe, gas distribution pipe is dispersed between Multi-layer exchanging heat pipe, many places heat exchange mechanisms is set, high-temperature medium is passed in the heat exchange mechanisms at lower place, cryogenic media or high-temperature medium is passed in the heat exchange mechanisms at upper place, and cigarette wind drier and heat exchange mechanisms interlaced arrangement, realize heat cascade utilization like this, be conducive to the efficiency improving dry run.
Further, heat exchange mechanisms also comprises inlet header and outlet header, heat exchanger tube described in multilayer is horizontally disposed with in described run coal bin, one end of Multi-layer exchanging heat pipe is connected to inlet header jointly, the other end is connected to outlet header jointly, Multi-layer exchanging heat pipe shares an inlet header and same outlet header, has saved the setting of multiple device.
Further, cigarette wind drier also comprises the air-dry dry inlet header of cigarette, the air-dry dry inlet header of cigarette is arranged on outside run coal bin, laminates tracheae one end is connected to the air-dry dry inlet header of cigarette jointly, the other end is arranged in described run coal bin, effectively puies forward high-octane replacement rate by arranging laminates tracheae.
Further, pass into the hot water after the working-medium water after adopting desulfurization slurry heat exchange or economizer heating in heat exchange of top part mechanism, what make full use of that surplus heat of power plant completes low-order coal in run coal bin is predrying.
Further, in the heat exchange mechanisms of bottom, low pressure (LP) cylinder steam is passed into.
Further, at vertical direction, the distance that in the gas distribution pipe described in multilayer, between adjacent two layers, interval is identical is arranged between described heat exchanger tube, and gas distribution pipe is disposed between multiple heat exchanger tube, realizes the Appropriate application of heat transferring medium heat.
Further, inlet header and outlet header are arranged on the same side outside described run coal bin.
Further, finned tube is set at described heat exchange pipe external surface, improves drying effect by finned tube.
Further, gas distribution pipe has several perforates, be provided with above described gas distribution pipe for the baffle plate preventing coal dust, coal grain enters gas distribution pipe, the circulation of perforate for flue gas is set.
Further, outside described run coal bin, arrange heat-insulation layer, the setting of heat-insulation layer is used for being incubated run coal bin, is conducive to the heat radiation reducing run coal bin.
Operation principle of the present invention is: two place's heat exchange mechanisms, the heat exchange mechanisms being positioned at place passes into cryogenic fluid, the heat exchange mechanisms being positioned at lower place passes into high temperature refrigerant, the hot water after the working-medium water after adopting desulfurization slurry heat exchange or economizer heating is passed in the heat exchange mechanisms at upper place, low pressure (LP) cylinder steam is passed in the heat exchange mechanisms at lower place, to realize the classified utilization of heat, improve capacity usage ratio.Working medium enters heat exchanger tube from inlet header, heat is passed to the coal in run coal bin by heat exchanger tube, and the water of having lowered the temperature after heat release enters outlet header from heat exchanger tube outlet.
Gas distribution pipe layering in run coal bin in cigarette wind drier is evenly arranged.The hot blast that thermal source in cigarette wind drier uses the flue gas after air preheater or boiler pnenmatic slag handling system to produce.Flue gas has fluidisation concurrently, loosens coal seam and play anti-blocking effect to a certain extent.The cigarette wind of heat is by the gas distribution pipe of conveying equipment in the air-dry dry inlet header feeding run coal bin of cigarette, and enter run coal bin uniformly, the low-order coal direct contact heat transfer with in run coal bin, carries out heat drying to coal.Low-order coal is through heating, wherein contained humidity is evaporated to steam, 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, the gas outlet arranged through run coal bin top is discharged, and enters the fume environment protection treatment facility entrance of boiler controller system, jointly discharges after purification with flue gas.
The invention has the beneficial effects as follows:
(1) power station low temperature exhaust heat is utilized to carry out drying to the coarsegrain in run coal bin, high-moisture percentage raw coal, do not affecting under the condition that run coal bin normally runs, coal drying process is carried and carries out to run coal bin, the conventional drying process that the time that is different from is shorter, because long drying time ensures, therefore in run coal bin, heat and mass efficiency is high, and coal drying is effective.As-fired coal matter can be improved economically, both the waste heat of power plant periphery had been made full use of, as the hot blast etc. of heat smoke, low-pressure steam, pnenmatic slag handling system, the environmental pollution saving the investment of the costliness of special newly-built raw coal drying system and operating cost simultaneously and may bring, also a saving power plant's floor space, and run coal bin movement-less part, reliability is high.
(2) hot cigarette wind, hot water (water vapour) combined drying are carried out to the raw coal in run coal bin, achieve expansion and the comprehensive utilization of residual heat of electric power plant, avoid the restriction of single drying mode, make system more flexible.And adopt progressive solution and step drying, the energy level that different temperatures thermal source has can be made full use of, high temperature heat source (low pressure (LP) cylinder steam) heats high-temperature material, low-temperature heat source (hot water) heats low-temperature material, realize heat cascade utilization, be conducive to the efficiency improving dry run, and and then the thermal efficiency of raising unit entirety.
(3) unique flue gas drying mechanism has fluidisation concurrently, loosens coal seam and play anti-blocking effect to a certain extent, reduces for wind pressure, and the run coal bin therefore installing drying unit additional than the coal sample of routine is compared, and raw coal blanking is more smooth and easy.
(4) owing to solving the dry problem of coarsegrain, high-moisture percentage coal from source, the difficulty such as the fragmentation of follow-up raw coal and powder process are reduced, and therefore the power consumption of these links significantly declines, thus reduces power plant's total energy consumption on the whole; And because baking temperature is low, coal granularity large, there will not be the potential safety hazards such as the dry coal dust explosion easily occurred of coal dust.
Accompanying drawing explanation
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 sectional view of A-A in Fig. 2 of the present invention;
Wherein: 1 is run coal bin, 2 be cryogenic fluid inlet header, 3 for high temperature refrigerant inlet header, 4 for the air-dry dry inlet header of cigarette, 5 for gas distribution pipe, 6 for heat exchanger tube, 7 for cryogenic fluid outlet header, 8 for high temperature refrigerant outlet header, 9 for dry wind export, 10 is dry wind entrance.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, clear, complete description is carried out to the technical scheme in the embodiment of the present invention.
Fig. 1 is the front view of run coal bin in the present invention, in figure, one utilizes surplus heat of power plant to carry out pre-dried run coal bin to low-order coal, comprise the run coal bin 1 that bottom arranges support, two place's heat exchange mechanisms and the cigarette wind drier for passing into hot cigarette wind is horizontally disposed with at run coal bin 1, two place's heat exchange mechanisms are successively set on the upper middle part of run coal bin 1 from top to bottom, 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 is arranged perpendicular to gas distribution pipe 5, gas distribution pipe 5 is dispersed between Multi-layer exchanging heat pipe 6, at vertical direction, the distance that in gas distribution pipe 5 described in multilayer, between adjacent two layers, interval is identical is arranged between described heat exchanger tube 6, namely 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 sectional view of A-A in Fig. 2 of the present invention; As we know from the figure, run coal bin 1 cross section is circular or square structure, top is in regular circle or square structure, bottom is reducing shape, low-order coal is stored in warehouse, and because of the structure of run coal bin 1, upper end diameter is larger, therefore the superiors' gas distribution pipe 5 is arranged two, the gas distribution pipe of below 5 every layer arrange one.Heat-exchanging component through reasonable Arrangement is arranged in warehouse, does not affect normal coal storage and blanking; Heat-insulation layer is set outside run coal bin 1, for being incubated run coal bin 1, being conducive to the heat radiation reducing run coal bin 1, improving utilization efficiency of heat energy.
Heat exchange mechanisms comprises inlet header, Multi-layer exchanging heat pipe 6 and outlet header, alternatively, Multi-layer exchanging heat pipe 6 is horizontally disposed with in described run coal bin 1, or straight line runs through inside and outside run coal bin 1, one end of Multi-layer exchanging heat pipe 6 is connected to inlet header jointly, the other end is connected to outlet header jointly, arranges finned tube at heat exchange pipe external surface.The heat exchanger tube two ends at lower place connect high temperature refrigerant inlet header 3 and high temperature refrigerant outlet header 8, and heat exchanger tube 6 two ends at upper place connect cryogenic fluid inlet header 2 and cryogenic fluid outlet header 7.
Cigarette wind drier comprises the air-dry dry inlet header 4 of cigarette and laminates tracheae 5, the air-dry dry inlet header 4 of cigarette is arranged on outside run coal bin 1, laminates tracheae 5 one end is connected to the air-dry dry inlet header of cigarette jointly, the other end is arranged in described run coal bin 1, is horizontally disposed with dry wind entrance 10 outside the air-dry dry inlet header of cigarette.Gas distribution pipe 5 vertically has several perforates, be provided with for the baffle plate preventing coal dust, coal grain enters gas distribution pipe above described gas distribution pipe 5, the setting of gas distribution pipe 5 meets low-order coal drying, prevents the effect of coal arch camber, blocking, reduces for wind pressure simultaneously; After cigarette wind flows out from gas distribution pipe 5, gone out from the dry wind outlet be arranged on above run coal bin 1 by cigarette wind passage, discharge after entering boiler flue gas purification system purification below.
Inlet header and outlet header are arranged on the same side outside run coal bin 1, and namely one end of heat exchanger tube 6 connects inlet header, and heat exchanger tube 6 encloses round run coal bin 1 one or after run coal bin 1, is connected to outlet header with the arranged in form of straight line.Heat exchanger tube 6 outer surface can install finned tube additional, and improve drying effect, as required heat exchanger tube 6 can be arranged to difformity, can be square, circular; According to coal blanking situation in warehouse 1, heat exchanger tube 6 also can be light pipe, can reduce flow resistance.
Raw coal before entering boiler milling system is stored in order to using in run coal bin, and meanwhile, run coal bin 1 is as the dry place of low-order coal; Raw coal can be the low-order coal of high-moisture percentage, as brown coal, also can be the coal that other moisture content do not meet power plant's requirement.
The drying source of low-order coal comes from the waste heat of boiler controller system, Ke Yiwei:
1) working-medium water after desulfurization slurry heat exchange, refers to the hot water recirculated water heat energy upgrading of wet process of FGD generated by heat pump;
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 during dry bottom ash handling system and cools produced hot-air etc.
The hot water after the working-medium water after adopting desulfurization slurry heat exchange or economizer heating is passed in the heat exchange mechanisms at upper place.
Low pressure (LP) cylinder steam is passed in the heat exchange mechanisms at lower place; Or all pass into the working medium of higher temperature in two place's heat exchange mechanisms.
Two place's heat exchange mechanisms, the heat exchange mechanisms being positioned at place passes into cryogenic fluid, the heat exchange mechanisms being positioned at lower place passes into high temperature refrigerant, the hot water after the working-medium water after adopting desulfurization slurry heat exchange or economizer heating is passed in the heat exchange mechanisms at upper place, low pressure (LP) cylinder steam is passed in the heat exchange mechanisms at lower place, to realize the classified utilization of heat, improve capacity usage ratio.Working medium enters heat exchanger tube 6 from inlet header, 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 enters outlet header from heat exchanger tube outlet, then turns back in duplex matter system.
Gas distribution pipe 5 layering in run coal bin in cigarette wind drier is evenly arranged.The hot blast that thermal source in cigarette wind drier uses the flue gas after air preheater or boiler pnenmatic slag handling system to produce.Flue gas has fluidisation concurrently, loosens coal seam and play anti-blocking effect to a certain extent.The cigarette wind of heat is by the gas distribution pipe of conveying equipment in the air-dry dry inlet header feeding run coal bin of cigarette, and enter run coal bin 1 uniformly, 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 heating, wherein contained humidity part is evaporated to steam, the cigarette wind that this part steam is passed into carries, by the cigarette wind passage in run coal bin 1, lead to the space on run coal bin 1 top, the gas outlet arranged through run coal bin 1 top is discharged, and enters the fume environment protection treatment facility entrance of boiler controller system, jointly discharges after purification with flue gas.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, 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 considered as protection scope of the present invention.
Claims (10)
1. one kind utilizes surplus heat of power plant to carry out pre-dried run coal bin to low-order coal, it is characterized in that, comprise run coal bin, many places heat exchange mechanisms and the cigarette wind drier for passing into hot cigarette wind is horizontally disposed with at run coal bin, many places heat exchange mechanisms sets gradually from top to bottom, and each heat exchange mechanisms 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 arranged perpendicular to gas distribution pipe, and gas distribution pipe is dispersed between Multi-layer exchanging heat pipe.
2. run coal bin as claimed in claim 1, it is characterized in that, described heat exchange mechanisms also comprises inlet header and outlet header, and the heat exchanger tube described in multilayer is horizontally disposed with in described run coal bin, one end of Multi-layer exchanging heat pipe is connected to inlet header jointly, and the other end is connected to outlet header jointly.
3. run coal bin as claimed in claim 1, it is characterized in that, described cigarette wind drier also comprises the air-dry dry inlet header of cigarette, the air-dry dry inlet header of cigarette is arranged on outside run coal bin, gas distribution pipe one end described in multilayer is connected to the air-dry dry inlet header of cigarette jointly, and the other end is arranged in described run coal bin.
4. run coal bin as claimed in claim 1, is characterized in that, passes into the hot water after the working-medium water after adopting desulfurization slurry heat exchange or economizer heating in described heat exchange of top part mechanism.
5. run coal bin as claimed in claim 1, is characterized in that, in described bottom heat exchange mechanisms, pass into low pressure (LP) cylinder steam.
6. run coal bin as claimed in claim 1, it is characterized in that, at vertical direction, the distance that in the gas distribution pipe described in multilayer, between adjacent two layers, interval is identical is arranged between described heat exchanger tube.
7. run coal bin as claimed in claim 2, it is characterized in that, described inlet header and outlet header are arranged on the same side outside described run coal bin.
8. run coal bin as claimed in claim 1, is characterized in that, arrange finned tube at described heat exchange pipe external surface.
9. run coal bin as claimed in claim 1, described gas distribution pipe has several perforates, is provided with for the baffle plate preventing coal dust, coal grain enters gas distribution pipe above described gas distribution pipe.
10. run coal bin as claimed in claim 1, arranges heat-insulation layer outside described run coal bin.
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| CN201510416538.5A CN104964528B (en) | 2015-07-15 | 2015-07-15 | One utilizes surplus heat of power plant to carry out pre-dried run coal bin to low-order coal |
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| CN201510416538.5A CN104964528B (en) | 2015-07-15 | 2015-07-15 | One utilizes surplus heat of power plant to carry out pre-dried run coal bin to low-order coal |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN106052308A (en) * | 2016-06-15 | 2016-10-26 | 成都昊特新能源技术股份有限公司 | Drying system and drying method utilizing steam turbine waste steam |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
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| 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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| CN104964528B (en) | 2016-05-18 |
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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. |