CN104180607B - A kind of brown coal multistage drying and upgrading system - Google Patents
A kind of brown coal multistage drying and upgrading system Download PDFInfo
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- CN104180607B CN104180607B CN201410412250.6A CN201410412250A CN104180607B CN 104180607 B CN104180607 B CN 104180607B CN 201410412250 A CN201410412250 A CN 201410412250A CN 104180607 B CN104180607 B CN 104180607B
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Abstract
The invention discloses a kind of brown coal multistage drying and upgrading system, this invention constructs complete brown coal upgrading and utilizes device, carries out a point size, coupling is stage by stage dry to brown coal, make use of the matter and energy produced in drying and upgrading process more fully simultaneously.In one section of drying, brown coal are by hothouse, directly contact dehydration, enter the pneumatic conveyer dryer of two sections of systems afterwards with high-temperature flue gas and the dry fine coal of granule that recycles.Pneumatic conveyer dryer small particles fine coal is carried upwards by the selection by winnowing effect of flue gas by air-flow, completes depth drying, a part is as boiler oil, another part returns one section of hothouse and serves as solid thermal carriers and lubricant medium, reduces the wearing and tearing of large coal particles, enhances the latter's drying efficiency simultaneously; Bulky grain brown coal are then separated to enter in superheat steam drying device and carry out deep dehydration, output.The drying medium such as flue gas and superheated steam provides by coal-burning boiler, and its fuel is the solid phase fine coal obtained in the fine coal of dry finished product and cyclone separator.
Description
Technical field
The invention belongs to low-order coal processing technique field, particularly relate to a kind of brown coal multistage drying and upgrading system.
Background technology
Coal occupies very important status with the reserves of its relative abundance and longer use history in China's energy resource structure, this situation does not have large change in foreseeable future, therefore, the utilization ratio improving coal has outstanding meaning for China's energy-saving and emission-reduction work, and particularly low-order coal that is low for degree of coalification, inferior quality is as all the more so in brown coal.
Brown coal are also known as bavin coal, compared with common bituminous coal or anthracite, the moisture of brown coal (maximum reach 40 ~ 60%) and volatile matter content is high, be easy to detrition in atmosphere, chemical reactivity is strong, be easy to spontaneous combustion occurs, it is very low that these character determine the thermal efficiency of brown coal directly as fuel, and be not suitable for the state of exploiting and carry out long-distance transportation.For solving the problem, industrially propose the multiple means improving brown coal quality (i.e. upgrading), comprise drying, low temperature distillation or partial gasification etc., main purpose is the most of moisture and the part volatile matter that remove brown coal, improves combustion heat value and the security of readymade coal.But for now, correlation technique does not all reach ripe and perfect level, often there is such-and-such problem.Particularly along with coal price falls after rise and the tightening up of new environmental protection standard, reduce the only way that upgrading cost and energy-saving and emission-reduction consumption reduction become brown coal utilization.
Patent (CN103307891A) proposes one and utilizes the classification of enclosed compressing hot pump to reclaim the used heat such as brown coal drying tail gas and lime-ash for the pre-dried system of brown coal, and lime-ash and dried tail gas are coagulated Water Sproading dosing brickmaking, the coal dust of gas-particle separation sends into heating furnace burning, and the heat of its lime-ash and flue gas is used for the depth drying of brown coal.The main thought of patent (CN102757833A) brown coal upgrading processes in different ways after brown coal are graded into uniform size, brown coal drying is combined with low temperature distillation technique, realized the dehydration stage by stage of brown coal by multiple drying mode (in tunnel type heated drying, indirectly outer heated drying, low-temperature microwave drying etc.) coupling, and utilize the portion of product of destructive distillation to make granular brown coal as the binding agent of powder brown coal.In patent (CN201803582U), the main feature of classification grinding drier utilizes selection by winnowing principle, the brown coal particle of reduced size is directly made finished product by pneumatic conveying drying process, the block brown coal of large-size then fall into the disintegrating apparatus of bottom of device, limit is pulverized, limit carries out slow drying, is decreased to be blown afloat by air-flow to a certain degree to reach depth drying further until size.Based on the system of the brown coal upgrading of fluidized bed mild-gasification and technique in patent (CN101818092A), its feature is that grading process mainly realizes through existing equipment, its process is main through two-step process, i.e. predrying and gasification destructive distillation, and this heat needed for two steps inherently provides primarily of brown coal itself (or its product), wherein predrying is that combustion gas (supplementing part solid fuel) the combustion heating air produced by second step realizes; The heat that gasification destructive distillation is then produced by process itself maintains, and removes the moisture of brown coal simultaneously.Patent (CN102759259A) proposes a kind of brown coal upgrading electricity generation system, wherein brown coal raw coal is by becoming finished product after boiler economizer flue gas and extracted steam from turbine Two stage dryer, a part sends into that boiler combustion is steamed, generated electricity, heat supply, and another part is as output of products.
Although above-mentioned technology respectively has feature, improves the whole efficiency of brown coal utilization in some aspects, all fail to solve following problems completely:
1) ensureing, under prerequisite compared with high heat transfer, mass-transfer efficiency, to improve the productive rate of bulky grain readymade coal, alleviating the workload of subsequent step (as ageing, granulation, shaping etc.), reduce the cost of technique;
2) the abundant recovery of the material in grading process, energy is realized, moisture particularly in dried tail gas, the heat of condensation and volatile matter, dried coal often needs to be cooled to normal temperature in addition, and this part sensible heat often scatters and disappears in vain, and being also is worth exploring and improving.
Therefore, exploitation takes into account the novel energy-saving environment-friendly brown coal process for upgrading of drying efficiency and bulky grain readymade coal productive rate, significant for promotion China brown coal industrialization process.
Summary of the invention
For above-mentioned defect or deficiency, the object of the present invention is to provide a kind of brown coal multistage drying and upgrading system, the yield of middle bulky grain readymade coal can be made to improve.
For reaching above object, technical scheme of the present invention is:
Comprise: brown coal conveying and pretreatment system, one section of drying system, two-stage drying system, flue gas drying waste gas utilization system, boiler combustion system and readymade coal gathering system;
Brown coal conveying comprises feeder and disintegrating machine with pretreatment system, and the delivery outlet of feeder is connected with the entrance of disintegrating machine;
One section of drying system comprises drying machine, and the solid inlet of drying machine is connected with the outlet of disintegrating machine;
Two-stage drying system comprises pneumatic conveyer dryer and superheat steam drying device, the solid inlet of pneumatic conveyer dryer is connected with the solid outlet of drying machine, the bottom bulky grain outlet of pneumatic conveyer dryer is connected with the solid inlet of superheat steam drying device, and the top granule outlet of pneumatic conveyer dryer is connected with drying machine entrance;
Flue gas drying waste gas utilization system comprises cyclone separator and device for recovering tail gas, cyclone separator carries out gas solid separation, the entrance of cyclone separator is connected with the gas vent of drying machine and the gas vent of pneumatic conveyer dryer respectively, and the gas vent of cyclone separator is connected with device for recovering tail gas;
Boiler combustion system comprises boiler, and the outlet of the high-temperature flue gas of boiler is connected with the gas access of drying machine and the gas access of pneumatic conveyer dryer, and the top granule of the fine coal entrance of boiler and the solid outlet of cyclone separator and pneumatic conveyer dryer exports and is connected;
Readymade coal gathering system comprises the readymade coal feed bin for collecting the bulky grain readymade coal completing drying and upgrading in superheat steam drying device.
Described device for recovering tail gas is compression heat pump system, compression heat pump system comprises: evaporimeter, heat pump compressor and condenser, wherein, the heat transferring medium entrance of evaporimeter is connected with the gas vent of cyclone separator, the heat transferring medium outlet of evaporimeter is connected with separated from contaminants treating apparatus, cyclone separator removes the flue gas drying tail gas of solid particle fine coal as heat transferring medium, flow through the evaporimeter releases heat of heat pump, separated recovery after hydrogenesis wherein, emptying after the tail gas of dehydration removes pollutant component in separated from contaminants treating apparatus; Working medium in evaporimeter through condenser heat rejection, gets back to evaporimeter to after boiler auxiliary combustion air heat after flowing through heat pump compressor pressurization, forms closed-loop path.
Between described evaporimeter and condenser, throttling arrangement is installed.
Described device for recovering tail gas comprises: the second evaporimeter, absorber, second throttling arrangement, solution heat exchanger, solution pump, generator, second condenser, water pump, wherein, the heat transferring medium entrance of the second evaporimeter is connected with the gas vent of cyclone separator, the heat transferring medium outlet of the second evaporimeter is connected with the second separated from contaminants treating apparatus, the sender property outlet of the second evaporimeter is connected with the working medium entrance of absorber, the taphole of absorber is connected with the pyrosol entrance of solution heat exchanger by the second throttling arrangement, the pyrosol outlet of solution heat exchanger is connected with the solution inlet of generator, the concentrated solution outlet of generator is connected with the cryogenic fluid entrance of solution heat exchanger, the cryogenic fluid outlet of solution heat exchanger is connected with the solution inlet of absorber by solution pump, cyclone separator removes the flue gas drying tail gas stream of particle fine coal through the second evaporimeter releases heat, and therefore moisture wherein condense and separated recovery, emptying after the tail gas of dehydration removes pollutant component in the second pollutant handling arrangement, bromize lithium dilute solution is filled with in generator, in second evaporimeter, in the vaporescence of aqueous water and generator, the evaporation process of bromize lithium dilute solution absorbs the heat from the external world, and the process that in water recovery in the second condenser and absorber, bromize lithium concentrated solution absorbs water vapour outwardly releases heat, wherein absorber heat release is for drying process or heat supply of living.
Described device for recovering tail gas comprises: the first reactor, second reactor, the 3rd reactor and the 4th reactor, wherein, in the first reactor and the second reactor, be filled with the first hydride material, in the 3rd reactor and the 4th reactor, be filled with the second hydride material; First reactor, the 3rd reactor and the second reactor, the 4th reactor form two pairs of coupled reactors respectively; The first hydride material in first reactor absorbs heat generation dehydrogenation reaction from waste heat source, release hydrogen, the valve of hydrogen between coupled reactor enters the 3rd reactor, be combined with the second hydride material wherein and hydrogenation occurs, release available heat for utilizing a temperature higher than waste heat source, namely work subprocess; Meanwhile, the second hydride material in 4th reactor absorbs heat generation dehydrogenation reaction from waste heat source, the hydrogen discharged enters the second reactor through valve, be combined with the first hydride material wherein and hydrogenation occurs, absorbed by cooling water outwardly releasing heat close to environment temperature, namely regenerate subprocess; When the reaction of two pairs of coupled reactors proceeds to close to poised state, respectively through the upper mode of operation be switched to after pre-cold-peace preheating each other, carry out the next one half circulation, second reactor, the 4th reactor carry out work subprocess, first reactor, the 3rd reactor carry out regeneration subprocess, switch again after reaching molecular balance, so repeat.
At identical temperature, described first hydride material molecular balance pressure is higher than the second hydride material.
Described high temperature flue-gas from boiler outlet is connected with flue gas blower fan, air preheater and economizer, and economizer gas vent is divided into two branch roads: the first branch road is connected with the gas access of pneumatic conveyer dryer, and the second branch road is connected with the gas access of drying machine; The normal temperature air entrance of air preheater is also connected with the ventilating fan with air.
Also comprise the purifier, the feed pump that connect successively, feedwater delivery side of pump is connected with the feed-water intake of economizer, and the feedwater outlet of economizer is connected with the feed-water intake of boiler.
The gas vent of described superheat steam drying device is connected with steam turbine, condenser and separator in turn.
Compared with the prior art, beneficial effect of the present invention is:
1, part of the present invention returns one section of hothouse through the granule coal dust of air-flow depth drying and serves as solid thermal carriers, this layout not only decreases the wearing and tearing of bulky grain brown coal by short grained lubrication and cushioning effect, improves the productive rate of finished product, and the drying effect of bulky grain brown coal is enhanced by the mass transport process of short grained contact heat-exchanging and adsorbed moisture, be expected to reach the object taking into account readymade coal yield and drying efficiency.
2, the depth drying of large and small particle of the present invention, realized by different technique, the deep dehydration of granule coal dust is completed instantaneously by pneumatic conveying drying, utilizes selection by winnowing principle to achieve the separation of the size particles after preliminarily dried simultaneously, eliminates screening plant; Isolated bulky grain brown coal then carry out volume drying by superheated steam, have the advantage that diffusional resistance is little, rate of drying is fast, product energies easily reclaims, and the drying mode that this multistage, size particles are treated with a certain discrimination is conducive to realizing higher drying efficiency.
3, the Material and energy utilization of brown coal of the present invention is comparatively abundant, and be not difficult to find out by technical process, the energy of dried superheated steam tail gas is reclaimed by steam turbine power generation; The heat of boiler smoke then goes through the cascade utilization of multiple link such as air preheater, economizer, and the medium finally as pneumatic conveying drying uses, and in outlet tail gas, hydrogenesis heat promotes utilization by heat pump, and effect reaches maximization; Granule coal dust fully dry in the present invention in addition one return one section of drying machine as drying medium, one enters boiler as fuel, and its sensible heat is all effectively utilized.
Accompanying drawing explanation
Fig. 1 is brown coal drying and upgrading entire system process chart of the present invention.
Fig. 2 is the flow chart utilizing compression heat pump recovered flue gas dried tail gas hydrogenesis heat.
Fig. 3 is the flow chart utilizing water-lithium bromide absorption heat pump recovered flue gas dried tail gas hydrogenesis heat.
Fig. 4 is the flow chart utilizing Metal hydride chemistry heat pump recovered flue gas dried tail gas hydrogenesis heat.
Fig. 5 is the work heating power circular chart of Metal hydride chemistry heat pump.
In figure, 1 is feeder, 2 is disintegrating machine, 3 is drying machine, 4 is pneumatic conveyer dryer, superheat steam drying device, 6 is readymade coal feed bin, 7 is cyclone separator, 8 is boiler, 9 is ventilating fan, 10 is air preheater, 11 is flue gas blower fan, 12 is economizer, 13 is steam turbine, 14 is condenser, 15 is separator, 16 is purifier, 17 is feed pump, 18 is evaporimeter, 19 is heat pump compressor, 20 is condenser, 21 is throttling arrangement, 22 is separated from contaminants treating apparatus, 23 is generator, 24 is the second condenser, 25 is water pump, 26 is the second separated from contaminants treating apparatus, 1-1 is the first reactor, 1-2 is the second reactor, 2-1 is the 3rd reactor, 2-2 is the 4th reactor, 18-1 is the second evaporimeter, 19-1 is absorber, 20-1 is the second throttling arrangement, 21-1 is solution heat exchanger, 22-1 is solution pump, 22-2 the 3rd pollutant handling arrangement.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in detail.
The invention provides a kind of brown coal multistage drying and upgrading system, comprising: brown coal conveying and pretreatment system, one section of drying system, two-stage drying system, flue gas drying waste gas utilization system, boiler combustion system and readymade coal gathering system;
Brown coal conveying comprises feeder 1 and disintegrating machine 2 with pretreatment system, and the delivery outlet of feeder 1 is connected with the entrance of disintegrating machine 2;
One section of drying system comprises drying machine 3, and the solid inlet of drying machine is connected with the outlet of disintegrating machine 2;
Two-stage drying system comprises pneumatic conveyer dryer 4 and superheat steam drying device 5, the solid inlet of pneumatic conveyer dryer 4 is connected with the solid outlet of drying machine 3, the bottom bulky grain outlet of pneumatic conveyer dryer 4 is connected with the solid inlet of superheat steam drying device 5, and the top granule outlet of pneumatic conveyer dryer 4 is connected with the solid inlet of drying machine 3 and boiler 8; The gas vent of described superheat steam drying device 5 is connected with steam turbine 13, condenser 14 and separator 15 in turn.
Flue gas drying waste gas utilization system comprises cyclone separator 7 and device for recovering tail gas, cyclone separator 7 carries out gas-particle separation, the entrance of cyclone separator 7 is connected with the gas vent of drying machine 3 and the gas vent of pneumatic conveyer dryer 4 respectively, and the gas vent of cyclone separator 7 is connected with device for recovering tail gas;
Boiler combustion system comprises boiler 8, the high-temperature flue gas outlet of boiler 8 is connected with the gas access of drying machine 3 and the gas access of pneumatic conveyer dryer 4, and the top granule of the fine coal entrance of boiler 8 and the solid outlet of cyclone separator 7 and pneumatic conveyer dryer 4 exports and is connected;
Readymade coal gathering system comprises the readymade coal feed bin 6 for collecting the bulky grain readymade coal completing drying and upgrading in superheat steam drying device 5.
The present invention also comprises the purifier 16, the feed pump 17 that connect successively, and the outlet of feed pump 17 is connected with the feed-water intake of economizer 12, and the feedwater outlet of economizer 12 is connected with the feed-water intake of boiler 8.
In the present invention, the retracting device of tail gas mainly comprises 3 kinds of modes:
The first: shown in Figure 2, described device for recovering tail gas is compression heat pump system, compression heat pump system comprises: evaporimeter 18, heat pump compressor 19, condenser 20 and throttling arrangement 21, wherein, the heat transferring medium entrance of evaporimeter 18 is connected with the gas vent of cyclone separator 7, the heat transferring medium outlet of evaporimeter 18 is connected with separated from contaminants treating apparatus 22, throttling arrangement 21 is installed between evaporimeter 18 and condenser 20, cyclone separator 7 removes evaporimeter 18 releases heat of flue gas drying tail gas stream through heat pump of solid particle fine coal, separated recovery after hydrogenesis wherein, it is emptying after the tail gas dewatered removes pollutant component in separated from contaminants treating apparatus 22, working medium in evaporimeter 18 is released heat through condenser 20, is got back to evaporimeter 18 to after boiler auxiliary combustion air heat after flowing through heat pump compressor 19 pressurization, forms closed-loop path, heat pump fluid, i.e. working media, flow in a device in the counterclockwise direction.Working medium is gas phase by liquid phase, at lower temperature absorption external heat, and is liquid phase by gas phase transition, is outwardly released heat in higher temperature again in condenser in evaporimeter.In brown coal upgrading system of the present invention, evaporimeter 18 releases heat of flue gas drying tail gas stream through heat pump of solid particle fine coal is removed through cyclone separator 7, therefore moisture wherein condense and separated recovery, emptying after the tail gas of dehydration removes pollutant component further in pollutant handling arrangement 22; Meanwhile, in brown coal drying and upgrading technique, one needs the stream stock of heating, and as combustion air, the condenser 20 flowing through heat pump is heated, thus achieves the recovery that flue tail gas coagulates hydro-thermal amount.
The second: shown in Figure 3, take water-lithium bromide as the second-kind absorption-type heat pump system that working medium is right, described device for recovering tail gas comprises: the second evaporimeter 18-1, absorber 19-1, second throttling arrangement 20-1, solution heat exchanger 21-1, solution pump 22-1, generator 23, second condenser 24, water pump 25, wherein, the entrance of the second evaporimeter 18-1 is connected with the gas vent of cyclone separator 7, the outlet of the second evaporimeter 18-1 is connected with the second separated from contaminants treating apparatus 26, the sender property outlet of the second evaporimeter 18-1 is connected with the working medium entrance of absorber 19-1, wherein, the working medium of the second evaporimeter 18-1 is water, the taphole of absorber 19-1 is connected with the pyrosol entrance of solution heat exchanger 21-1 by the second throttling arrangement 20-1, the pyrosol outlet of solution heat exchanger 21-1 is connected with the solution inlet of generator 23, the concentrated solution outlet of generator 23 is connected with the cryogenic fluid entrance of solution heat exchanger 21-1, the cryogenic fluid outlet of solution heat exchanger 21-1 is connected with the solution inlet of absorber 19-1 by solution pump 22-1, cyclone separator 7 removes the flue gas drying tail gas stream of particle fine coal through the second evaporimeter 18-1 releases heat, and therefore moisture wherein condense and separated recovery, emptying after the tail gas of dehydration removes pollutant component in the second pollutant handling arrangement 26, bromize lithium dilute solution is filled with in generator 23, in second evaporimeter 18-1, in the vaporescence of aqueous water and generator 23, the evaporation process of bromize lithium dilute solution absorbs the heat from the external world, and the process that in water recovery in the second condenser 24 and absorber 19-1, bromize lithium concentrated solution absorbs water vapour outwardly releases heat, wherein the temperature of absorber 19-1 heat release higher (circulation is called second-kind absorption-type heat pump) is afterwards for drying process or heat supply of living.In second evaporimeter 18-1, in the vaporescence of aqueous water and generator 23, the evaporation process of bromize lithium dilute solution absorbs the heat from the external world, the process that in water recovery in the second condenser 24 and absorber 19-1, bromize lithium concentrated solution absorbs water vapour then outwardly releases heat, wherein absorber exothermic temperature is higher, can for drying process or life heat supply.In brown coal upgrading system of the present invention, the flue gas drying tail gas stream removing particle fine coal through cyclone separator 7 is through the second evaporimeter 18-1 of second-kind absorption-type heat pump and generator 23 releases heat, therefore moisture wherein condense and separated recovery, emptying after the tail gas of dehydration removes pollutant component further in the second pollutant handling arrangement 26; Meanwhile, in brown coal drying and upgrading technique, one needs the stream stock of heating, and as combustion air, the absorber 19-1 flowing through heat pump is heated, thus achieves the recovery that flue tail gas coagulates hydro-thermal amount.
The third: shown in Fig. 4, Fig. 5, described device for recovering tail gas comprises: the first reactor 1-1, second reactor 1-2, the 3rd reactor 2-1 and the 4th reactor 2-2, wherein, the first hydride material is filled with in first reactor 1-1 and the second reactor 1-2, be filled with the second hydride material in 3rd reactor 2-1 and the 4th reactor 2-2, and the first reactor 1-1, the 3rd reactor 2-1 and the second reactor 1-2, the 4th reactor 2-2 form two pairs of coupled reactors respectively; The first hydride material in first reactor 1-1 absorbs heat generation dehydrogenation reaction from extraneous (waste heat source), release hydrogen, the valve of hydrogen between coupled reactor enters the 3rd reactor 2-1, being combined with the second hydride material wherein and hydrogenation occurs, outwardly releasing the higher heat of temperature for utilizing; The second hydride material in 4th reactor 2-2 absorbs heat generation dehydrogenation reaction from extraneous (waste heat source), the hydrogen discharged enters the second reactor 1-2 through valve, be combined with the first hydride material wherein and hydrogenation occurs, outwardly release heat and absorbed by cooling water; When the reaction of two pairs of coupled reactors proceeds to close to poised state, a mode of operation is gone up each other respectively through being switched to after pre-cold-peace preheating, carry out the next one half circulation, second reactor 1-2, the 4th reactor 2-2 carry out work subprocess, first reactor 1-1, the 3rd reactor 2-1 carry out regeneration subprocess, switch again after reaching molecular balance, so repeat.Concrete, with metal hydride-hydrogen for the chemical heat pump system that working medium is right is formed primarily of 4 reactors, wherein solid line represents current semi-cyclic direction of flow, and dotted line represents next semi-cyclic direction of flow.Wherein load the first hydride material in the first reactor 1-1 and the second reactor 1-2, in the 3rd reactor 2-1 and the 4th reactor 2-2, load the second hydride material.At identical temperature, described first hydride material molecular balance pressure is higher than the second hydride material, such as: described first hydride material is LaNi
5; Second hydride material is LaNi
4.7al
0.3, when practical application, for same condition of work, the pairing material of metal hydride heat pump also can have a variety of mode, and therefore specifically listing material can choose according to actual operating conditions.
To circulate when first half, in work subprocess, the first hydride material in first reactor 1-1, state 3 in Fig. 5 absorbs the heat generation dehydrogenation reaction that temperature is TM from the external world, the valve of the hydrogen discharged between coupled reactor enters the 3rd reactor 2-1, with the second hydride material wherein, and the state 4 in Fig. 5, in conjunction with generation hydrogenation, outwardly release temperature be TH heat can for utilize; Meanwhile there is regeneration subprocess to reactor in another, the second hydride material in 4th reactor 2-2, state 1 in Fig. 5, the heat generation dehydrogenation reaction that temperature is TM is absorbed from the external world, the hydrogen discharged enters the second reactor 1-2 through valve, with the first hydride material wherein, and the state 2 in Fig. 5, in conjunction with generation hydrogenation, outwardly releasing temperature is that the heat of TL is absorbed by cooling water.When the reaction of two pairs of coupled reactors proceeds to close to poised state, respectively through pre-cold-peace preheating, 1 ~ 4,2 ~ 3 state transformations, as shown in Figure 5, after be switched to and go up a mode of operation each other, carry out the next one half circulation, namely 1 ~ 2,2 ~ 2 carry out work subprocess, and 1 ~ 1,2 ~ 1 carry out regeneration subprocess, switch after reaching molecular balance again, so repeat, constantly carry out the conversion process of energy.In brown coal upgrading system of the present invention, the flue gas drying tail gas stream removing particle fine coal through cyclone separator 7 is in warm reactor in two of state 1 and 3 through chemical heat pump, releases heat, therefore moisture wherein condense and separated recovery, it is emptying after the tail gas of the dehydration of the first reactor 1-1, the second reactor 1-2, the 3rd reactor 2-1 and the 4th reactor 2-2 removes pollutant component further in the 3rd pollutant handling arrangement 22-2; Meanwhile, in brown coal drying and upgrading technique, one needs the stream stock of heating, as combustion air, flows through the high-temperature reactor that chemical heat pump is in state 4 and is heated, thus achieve the recovery that flue tail gas coagulates hydro-thermal amount; One cooling water needs reactor chemical heat pump being in state 2 to cool in addition.
Described boiler 8 high-temperature flue gas outlet is connected with flue gas blower fan 11, air preheater 10 and economizer 12, and economizer 12 gas vent is divided into two branch roads: the first branch road is connected with the gas access of pneumatic conveyer dryer 4, and the second branch road is connected with the gas access of drying machine 3; The normal temperature air entrance of air preheater 10 is also connected with the ventilating fan 9 with air.
Embodiment 1: a kind of brown coal multistage drying and upgrading system, its treatment step is as follows:
1) brown coal are transported into drying and upgrading system by feeder, first tentatively pulverize through disintegrating machine, obtain the brown coal particle that size is different;
2) in the conveyer belt hothouse of one section of drying system, the moisture brown coal particle varied in size is in the process of easy motion, contact generating portion with the granule coal dust through two sections of pneumatic conveyer dryer deep dehydrations with the high-temperature flue gas from boiler to dewater, the surface moisture of removing brown coal, one section of dry solid product enters the pneumatic conveyer dryer of two-stage drying system, and flue gas drying tail gas enters cyclone separator;
3) pneumatic conveyer dryer of two-stage drying system is entered through the brown coal of one section of partial dehydration, its small particles brown coal are carried up generation wink-dry by the flue gas of the bottom-up motion from boiler, the granule coal dust finished product of depth drying is obtained at top, dried tail gas enters cyclone separator, bulky grain brown coal are then deposited in bottom under gravity, enter the superheat steam drying device of two-stage drying system after collection;
4) granule dry coal dust finished product in pneumatic conveyer dryer top is divided into two strands, one delivers to boiler as fuel, another strand returns the conveyer belt hothouse of one section of drying system, both as dry solid thermal carriers also as the lubricant reducing bulky grain brown coal and wear and tear;
5) the bulky grain brown coal of partial dehydration directly contact generation deep dehydration with the superheated steam from boiler in superheat steam drying device, solid product enters after readymade coal feed bin cools naturally and exports as the finished product brown coal of upgrading, dried tail gas (being mainly moisture and volatile matter) reclaims after power, condenser cooling condensation through steam turbine, isolates moisture and volatile matter utilizes respectively;
6) in cyclone separator, solid phase coal dust is separated and sends into boiler as fuel, the evaporimeter heat release of the compressed heat pump of the tail gas stream after dedusting, most of moisture condensation are wherein reclaimed, tail gas after dehydration is emptying after removing pollutant component, the condenser of compression heat pump system releases heat in higher temperature, can for technique (as combustion air or boiler feedwater preheating) and life;
7) boiler of upgrading system is mainly used in providing flue gas and superheated steam as drying medium, its fuel comprises isolated solid coal powder particle in the dry coal dust finished product of granule that pneumatic conveyer dryer top obtains, cyclone separator, the high-temperature flue gas produced in combustion process can carry out heat exchange with superheated steam, boiler feedwater or combustion air before entering drier, to improve the thermal efficiency of system, wherein should not affect premised on drying process with both heat exchange rear.
Embodiment 2: a kind of brown coal multistage drying and upgrading system, its treatment step is as follows:
1) brown coal are transported into drying and upgrading system by feeder, first tentatively pulverize through disintegrating machine, obtain the brown coal particle that size is different;
2) indoor in the drum dried of one section of drying system, the moisture brown coal particle varied in size is in the process of easy motion, contact generating portion with the granule coal dust through two sections of pneumatic conveyer dryer deep dehydrations with the high-temperature flue gas from boiler to dewater, the surface moisture of removing brown coal, solid product enters the pneumatic conveyer dryer of two-stage drying system, and flue gas drying tail gas enters cyclone separator;
3) pneumatic conveyer dryer of two-stage drying system is entered through the brown coal of one section of partial dehydration, its small particles brown coal are carried up generation wink-dry by the flue gas of the bottom-up motion from boiler, the granule coal dust finished product of depth drying is obtained at top, dried tail gas enters cyclone separator, bulky grain brown coal are then deposited in bottom under gravity, enter the superheat steam drying device of two-stage drying system after collection;
4) granule dry coal dust finished product in pneumatic conveyer dryer top is divided into two strands, one delivers to boiler as fuel, another strand returns the conveyer belt hothouse of one section of drying system, both as dry solid thermal carriers also as the lubricant reducing bulky grain brown coal and wear and tear;
5) the bulky grain brown coal of partial dehydration directly contact generation deep dehydration with the superheated steam from boiler in superheat steam drying device, solid product enters after readymade coal feed bin cools naturally and exports as the finished product brown coal of upgrading, dried tail gas (being mainly moisture and volatile matter) reclaims after power, condenser cooling condensation through steam turbine, isolates moisture and volatile matter utilizes respectively;
6) in cyclone separator, solid phase coal dust is separated and sends into boiler as fuel, tail gas stream after dedusting reclaims through the evaporimeter of second-kind absorption-type heat pump system and generator heat release, most of moisture condensation wherein, the absorber of second-kind absorption-type heat pump system releases heat in higher temperature simultaneously, can for technique (as combustion air or boiler feedwater preheating) and life;
7) boiler of upgrading system is mainly used in providing flue gas and superheated steam as drying medium, its fuel comprises isolated solid coal powder particle in the dry coal dust finished product of granule that pneumatic conveyer dryer top obtains, cyclone separator, the high-temperature flue gas produced in combustion process can carry out heat exchange with superheated steam, boiler feedwater or combustion air before entering drier, to improve the thermal efficiency of system, wherein should not affect premised on drying effect with both heat exchange rear.
Embodiment 3: a kind of brown coal multistage drying and upgrading system, its treatment step is as follows:
1) brown coal are transported into drying and upgrading system by feeder, first tentatively pulverize through disintegrating machine, obtain the brown coal particle that size is different;
2) in the screw rod hothouse of one section of drying system, the moisture brown coal particle varied in size is in the process of easy motion, contact generating portion with the granule coal dust through two sections of pneumatic conveyer dryer deep dehydrations with the high-temperature flue gas from boiler to dewater, the surface moisture of removing brown coal, solid product enters the pneumatic conveyer dryer of two-stage drying system, and flue gas drying tail gas enters cyclone separator;
3) pneumatic conveyer dryer of two-stage drying system is entered through the brown coal of one section of partial dehydration, its small particles brown coal are carried up generation wink-dry by the flue gas of the bottom-up motion from boiler, the granule coal dust finished product of depth drying is obtained at top, dried tail gas enters cyclone separator, bulky grain brown coal are then deposited in bottom under gravity, enter the superheat steam drying device of two-stage drying system after collection;
4) granule dry coal dust finished product in pneumatic conveyer dryer top is divided into two strands, one delivers to boiler as fuel, another strand returns the conveyer belt hothouse of one section of drying system, both as dry solid thermal carriers also as the lubricant reducing bulky grain brown coal and wear and tear;
5) the bulky grain brown coal of partial dehydration directly contact generation deep dehydration with the superheated steam from boiler in superheat steam drying device, solid product enters after readymade coal feed bin cools naturally and exports as the finished product brown coal of upgrading, dried tail gas, be mainly moisture and volatile matter, reclaim after power, condenser cooling condensation through steam turbine, isolate moisture and volatile matter utilizes respectively;
6) in cyclone separator, solid phase coal dust is separated and sends into boiler as fuel, the warm reactor heat release in two of Metal hydride chemistry heat pump of tail gas stream after dedusting, most of moisture condensation are wherein reclaimed, and simultaneously the high-temperature reactor liberated heat of metal hydride heat pump system for technique (as combustion air or boiler feedwater preheating) and can be lived;
7) boiler of upgrading system is mainly used in providing flue gas and superheated steam as drying medium, its fuel comprises isolated solid coal powder particle in the dry coal dust finished product of granule that pneumatic conveyer dryer top obtains, cyclone separator, the high-temperature flue gas produced in combustion process can carry out heat exchange with superheated steam, boiler feedwater or combustion air before entering drier, to improve the thermal efficiency of system, wherein should not affect premised on drying effect with both heat exchange rear.
Claims (9)
1. a brown coal multistage drying and upgrading system, is characterized in that, comprising: brown coal conveying and pretreatment system, one section of drying system, two-stage drying system, flue gas drying waste gas utilization system, boiler combustion system and readymade coal gathering system;
Brown coal conveying comprises feeder (1) and disintegrating machine (2) with pretreatment system, and the delivery outlet of feeder (1) is connected with the entrance of disintegrating machine (2);
One section of drying system comprises drying machine (3), and the solid inlet of drying machine (3) is connected with the outlet of disintegrating machine (2);
Two-stage drying system comprises pneumatic conveyer dryer (4) and superheat steam drying device (5), the solid inlet of pneumatic conveyer dryer (4) is connected with the solid outlet of drying machine (3), the bottom bulky grain outlet of pneumatic conveyer dryer (4) is connected with the solid inlet of superheat steam drying device (5), and the top granule outlet of pneumatic conveyer dryer (4) is connected with drying machine (3) entrance;
Flue gas drying waste gas utilization system comprises cyclone separator (7) and device for recovering tail gas, cyclone separator (7) carries out gas-particle separation, the entrance of cyclone separator (7) is connected with the gas vent of drying machine (3) and the gas vent of pneumatic conveyer dryer (4) respectively, and the gas vent of cyclone separator (7) is connected with device for recovering tail gas;
Boiler combustion system comprises boiler (8), the high-temperature flue gas outlet of boiler (8) is connected with the gas access of drying machine (3) and the gas access of pneumatic conveyer dryer (4), and the top granule of the fine coal entrance of boiler (8) and the solid outlet of cyclone separator (7) and pneumatic conveyer dryer (4) exports and is connected;
Readymade coal gathering system comprises the readymade coal feed bin (6) for collecting the bulky grain readymade coal completing drying and upgrading in superheat steam drying device (5).
2. brown coal multistage drying and upgrading system according to claim 1, it is characterized in that, described device for recovering tail gas is compression heat pump system, compression heat pump system comprises: evaporimeter (18), heat pump compressor (19) and condenser (20), wherein, the heat transferring medium entrance of evaporimeter (18) is connected with the gas vent of cyclone separator (7), the heat transferring medium outlet of evaporimeter (18) is connected with separated from contaminants treating apparatus (22), the flue gas drying tail gas that cyclone separator (7) removes solid particle fine coal flows through evaporimeter (18) releases heat of heat pump as heat transferring medium, separated recovery after hydrogenesis wherein, it is emptying after the tail gas dewatered removes pollutant component in separated from contaminants treating apparatus (22), after working medium in evaporimeter (18) flows through heat pump compressor (19) pressurization, through condenser (20) condensation heat release, to getting back to evaporimeter (18) after boiler auxiliary combustion air heat, form closed-loop path.
3. brown coal multistage drying and upgrading system according to claim 2, is characterized in that, be provided with throttling arrangement (21) between described evaporimeter (18) and condenser (20).
4. brown coal multistage drying and upgrading system according to claim 1, it is characterized in that, described device for recovering tail gas comprises: the second evaporimeter (18-1), absorber (19-1), second throttling arrangement (20-1), solution heat exchanger (21-1), solution pump (22-1), generator (23), second condenser (24), water pump (25), wherein, the heat transferring medium entrance of the second evaporimeter (18-1) is connected with the gas vent of cyclone separator (7), the heat transferring medium outlet of the second evaporimeter (18-1) is connected with the second separated from contaminants treating apparatus (26), the sender property outlet of the second evaporimeter (18-1) is connected with the working medium entrance of absorber (19-1), the taphole of absorber (19-1) is connected with the pyrosol entrance of solution heat exchanger (21-1) by the second throttling arrangement (20-1), the pyrosol outlet of solution heat exchanger (21-1) is connected with the solution inlet of generator (23), the concentrated solution outlet of generator (23) is connected with the cryogenic fluid entrance of solution heat exchanger (21-1), the cryogenic fluid outlet of solution heat exchanger (21-1) is connected by the solution inlet of solution pump (22-1) with absorber (19-1), cyclone separator (7) removes the flue gas drying tail gas stream of particle fine coal through the second evaporimeter (18-1) releases heat, therefore moisture wherein condense and separated recovery, emptying after the tail gas of dehydration removes pollutant component in the second pollutant handling arrangement (26), generator is filled with bromize lithium dilute solution in (23), in second evaporimeter (18-1), the vaporescence of aqueous water and the evaporation process of the middle bromize lithium dilute solution of generator (23) absorb the heat from the external world, and the process that in water recovery in the second condenser (24) and absorber (19-1), bromize lithium concentrated solution absorbs water vapour outwardly releases heat, wherein absorber (19-1) heat release is for drying process or heat supply of living.
5. brown coal multistage drying and upgrading system according to claim 1, it is characterized in that, described device for recovering tail gas comprises: the first reactor (1-1), second reactor (1-2), the 3rd reactor (2-1) and the 4th reactor (2-2), wherein, be filled with the first hydride material in first reactor (1-1) and the second reactor (1-2), in the 3rd reactor (2-1) and the 4th reactor (2-2), be filled with the second hydride material; First reactor (1-1), the 3rd reactor (2-1) and the second reactor (1-2), the 4th reactor (2-2) form two pairs of coupled reactors respectively; The first hydride material in first reactor (1-1) absorbs heat generation dehydrogenation reaction from waste heat source, release hydrogen, the valve of hydrogen between coupled reactor enters the 3rd reactor (2-1), be combined with the second hydride material wherein and hydrogenation occurs, release available heat for utilizing a temperature higher than waste heat source, namely work subprocess; Meanwhile, the second hydride material in 4th reactor (2-2) absorbs heat generation dehydrogenation reaction from waste heat source, the hydrogen discharged enters the second reactor (1-2) through valve, be combined with the first hydride material wherein and hydrogenation occurs, absorbed by cooling water outwardly releasing heat close to environment temperature, namely regenerate subprocess; When the reaction of two pairs of coupled reactors proceeds to close to poised state, respectively through the upper mode of operation be switched to after pre-cold-peace preheating each other, carry out the next one half circulation, second reactor (1-2), the 4th reactor (2-2) carry out work subprocess, first reactor (1-1), the 3rd reactor (2-1) carry out regeneration subprocess, switch again after reaching molecular balance, so repeat.
6. brown coal multistage drying and upgrading system according to claim 5, is characterized in that, at identical temperature, described first hydride material molecular balance pressure is higher than the second hydride material.
7. brown coal multistage drying and upgrading system according to claim 1, it is characterized in that, the outlet of described boiler (8) high-temperature flue gas is connected with flue gas blower fan (11), air preheater (10) and economizer (12), economizer (12) gas vent is divided into two branch roads: the first branch road is connected with the gas access of pneumatic conveyer dryer (4), and the second branch road is connected with the gas access of drying machine (3); The normal temperature air entrance of air preheater (10) is also connected with and the ventilating fan of air (9).
8. brown coal multistage drying and upgrading system according to claim 7, it is characterized in that, also comprise the purifier (16), the feed pump (17) that connect successively, the outlet of feed pump (17) is connected with the feed-water intake of economizer (12), and the feedwater outlet of economizer (12) is connected with the feed-water intake of boiler (8).
9. brown coal multistage drying and upgrading system according to claim 1, it is characterized in that, the gas vent of described superheat steam drying device (5) is connected with steam turbine (13), condenser (14) and separator (15) in turn.
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| CN105241182B (en) * | 2015-10-22 | 2017-09-22 | 中国矿业大学 | Brown coal drying system and its drying means |
| CN108626740B (en) * | 2018-04-08 | 2024-04-26 | 大唐(北京)能源管理有限公司 | Multistage dry brown coal power generation system of flue gas |
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