CN102618346A - High-efficiency low-temperature vacuum brown-coal upgrading device and process - Google Patents

High-efficiency low-temperature vacuum brown-coal upgrading device and process Download PDF

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Publication number
CN102618346A
CN102618346A CN2012100780714A CN201210078071A CN102618346A CN 102618346 A CN102618346 A CN 102618346A CN 2012100780714 A CN2012100780714 A CN 2012100780714A CN 201210078071 A CN201210078071 A CN 201210078071A CN 102618346 A CN102618346 A CN 102618346A
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transition section
vacuum
brown coal
heating zone
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解欣业
张浙军
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解欣业
张浙军
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Abstract

The invention provides a high-efficiency low-temperature vacuum brown-coal upgrading device. The high-efficiency low-temperature vacuum brown-coal upgrading device is characterized by mainly comprising a vacuum dewatering chamber and a vacuum obtaining system, wherein the vacuum obtaining system is connected to the vacuum dewatering chamber through a pipeline; the vacuum dewatering chamber comprises three parts, i.e. a transition section, a heating section and a cooling section; the transition section is connected with the heating section which is connected with the cooling section; a gate valve is respectively arranged between the transition section and the heating section and between the heating section and the cooling section; the vacuum obtaining system is communicated to the transition section and the heating section by pipelines; and a heat exchange system is also arranged on the transition section and the heating section respectively. The high-efficiency low-temperature vacuum brown-coal upgrading device provided by the invention has the advantages that: drying and upgrading of brown coal can be carried out continuously, and the length and the quantity of the middle vacuum chambers can be increased according to the designed productivity; and the capability for processing the brown coal can reach 150-200 tons in each hour, so that the efficiency of brown-coal upgrading and the quality of the upgraded brown coal are greatly improved.

Description

High efficient cryogenic vacuum brown coal device for improving quality and process for upgrading
Technical field
The present invention relates to a kind of brown coal upgrading device and technology, be specifically related to a kind of new and effective cryogenic vacuum brown coal device for improving quality and technology.
Background technology
Brown coal are the minimum coals of degree of coalification, and it is a peat deposition after dehydration, compacting change the initial stage product of organic-biological rock into, because of appearance is brown or dun is gained the name.3194.38 hundred million tons of China's lignite resource amounts account for 5.74% of coal resources total amount, and brown coal are verified and possessed 1291.32 hundred million tons of stock numbers, account for the whole nation and verify and possess 12.69% of stock number.The most of tarnishes of brown coal, true density are between 1.1~1.4g/cm3, and moisture is up to 30%-60%, and volatile matter is high, and burning-point is low, and is non-caked, and it is rotten to be prone to elegance and talent, contains primary humic acids, contains the oxygen height, and chemical reactivity is strong, poor heat stability.
Coal is the main fuel used to generate electricity of the present China and even the whole world, and coal for power generation is mainly high-order coal (bituminous coal) and low-rank coal (brown coal) two big classes.Undoubtedly, the main raw material of coal power station all will be the high-order coal in very long for some time in future, but as the bigger country of brown coal reserves, we should actively consider to increase the usage quantity of brown coal fuel.
The brown coal moisture of China, ash content are high, and sulphur is lower, and easy-weathering and spontaneous combustion should not long-distance transportations and directly use, and efficiency of combustion is low, and has increased the Carbon emission pollution.If can adopt the brown coal drying and upgrading technology, the moisture of 50% in the brown coal is removed, then will reduce by 15% to the quantity discharged of the greenhouse gases of brown coal burning back generation.Actual test learns, the brown coal of a kind of moisture 42.52%, thermal value 11.93MJ/kg are after the upgrading drying; Moisture reduces to 14.43%; Thermal value increases to 18.08MJ/kg, is equivalent to improve calorific value 51.6%, and this influence for brown coal power plant is very huge beyond doubt; Also reduced simultaneously emission of carbon-dioxide, social benefit also very significantly.The high moisture content of brown coal makes the long-distance transport relative cost of its unit energy high in addition, generally can only utilize nearby.The field conditions in China main brown coal producing region is better relatively, and production capacity is also higher, if do not take the processing means that suits, it is high and utilize the contradiction of scarce capacity the coming years to occur brown coal output.
Many in recent years units begin to pay close attention to brown coal dehydration upgrading, improve the technological development of use characteristics, and brown coal upgrading processing is the keys of the efficient development and use of brown coal.
The brown coal contained humidity overwhelming majority is a kapillary moisture, can only dewater with the mode of heating evaporation, and traditional drying means is to utilize stack gas directly to contact with brown coal to make it to be heated; Moisture evaporation and drying, efficient is high, but the burning-point of brown coal is lower; Drying process is usually because of local superheating; Make the ature of coal variation, control badly, also can set off an explosion.
Summary of the invention
Goal of the invention: the present invention provides a kind of high efficient cryogenic vacuum brown coal device for improving quality and process for upgrading, its objective is the solution unfavorable problem of brown coal dehydration upgrading effect in the past.
Technical scheme: the present invention realizes through following technical scheme:
A kind of high efficient cryogenic vacuum brown coal device for improving quality; It is characterized in that: this device mainly comprises vacuum hydro-extraction chamber and vacuum acquiring system; Vacuum acquiring system is connected to the vacuum hydro-extraction chamber through pipeline, and the vacuum hydro-extraction chamber comprises transition section, heating zone and cooling section three parts, and transition section connects heating zone; Heating zone connects cooling section, is provided with slide valve between transition section and the heating zone and between heating zone and the cooling section; Vacuum acquiring system is through pipeline connection to transition section and heating zone; On transition section and heating zone, also be provided with heat-exchange system.
Heat-exchange system is connected to power station afterheat steam system through the heating steam passage.
Vacuum acquiring system is connected to the cold filtration system.
Vacuum acquiring system is for being the steam jet pump of power with thermal power plant's afterheat steam.
Transition section and heating zone are vacuum chamber structure, and transition section is made up of one or more Vakuumkammers, when transition section is made up of a plurality of Vakuumkammers, are separated by slide valve between the adjacent Vakuumkammer.
Transition section and heating zone also are provided with infrared heating device.
The bottom inner at transition section, heating zone and cooling section is provided with transport unit.
The high efficient cryogenic vacuum brown coal process for upgrading that utilizes high efficient cryogenic vacuum brown coal device for improving quality recited above to be implemented, it is characterized in that: the step of this technology is following:
After pulverization process, tiling places waggon with the brown coal of exploiting out,
Open the slide valve of transition section outermost Vakuumkammer, waggon is sent into the transition section 1 of vacuum hydro-extraction chamber front end, subsequently the slide valve of opening cuts out; Be that the steam jet pump of power will begin the Vakuumkammer of transition section and heating zone to vacuumize with thermal power plant's afterheat steam simultaneously, vacuum degree in vacuum chamber reaches 3 * 10 3Pa~8 * 10 3Pa;
Slide valve between transition section and the heating zone is opened, waggon through the transport unit of transition section bottom heating zone with 4-7 rice/minute speed travel forward and get into heating zone; Through the heat-exchange system heating, brown coal are preheated to 15 ℃~20 ℃ at transition section to brown coal in the waggon, get into heating zone then in by the process of transition section to heating zone;
After a waggon left transition section and sends into heating zone, transition section was closed with the slide valve between the heating zone, at this moment, again transition section outside slide valve was opened, and next waggon will be sent into subsequently;
Brown coal after the preheating will continue through the heat-exchange system heating after sending into heating zone; Gradually brown coal are heated to 60 ℃~90 ℃; Moisture in the brown coal will be along with the rising of temperature breaks away from gradually and is evaporated, and is extracted out by the steam jet pump, feeds the cold filtration system; After condensation, the collection of purifying, be used for the cooling water in power station, realize the comprehensive high-efficiency utilization of water;
The brown coal of finishing dealing with at the heating zone drying and upgrading are sent to cooling section from the heating under vacuum section, adopt the mode of naturally cooling to be cooled to room temperature gradually at cooling section, subsequently from the terminal output of cooling section.
The thickness that brown coal tile on waggon before sending into transition section is 20mm~30mm.
The power station afterheat steam is fed heat-exchange system as thermal source transition section and heating zone are heated, also can open infrared assisted heating device raising rate of heating at transition section and heating zone.
Advantage and effect:
To above situation, the present invention proposes a kind of new and effective cryogenic vacuum brown coal device for improving quality and technology, utilize thermal power plant's afterheat steam to drive steam jet pump extracting vacuum; And utilize the afterheat steam in power station in the rough vacuum environment, brown coal to be heated; Thereby the moisture destructive distillation in the brown coal is separated, effectively reduce the content of the planar water in the brown coal, also reduced the sulphur in the brown coal, methane and ash oontent simultaneously; Thereby improve the calorific value of brown coal, reach the coal in power plant requirement.In this simultaneously, isolated moisture will be used for the cooling water of thermal power plant in the brown coal after condensation, purification, collection, realize effective comprehensive utilization of water.
Description of drawings:
Fig. 1 is a process for upgrading schema of the present invention;
Fig. 2 is the structural representation of device for improving quality of the present invention;
Fig. 3 is the structural representation of vacuum hydro-extraction of the present invention chamber.
Embodiment:Below in conjunction with accompanying drawing the present invention is done further description:
As shown in Figure 2; The present invention provides a kind of high efficient cryogenic vacuum brown coal device for improving quality, and this device mainly comprises vacuum hydro-extraction chamber and vacuum acquiring system 5, and vacuum acquiring system 5 is connected to the vacuum hydro-extraction chamber through pipeline 12; The vacuum hydro-extraction chamber comprises transition section 1, heating zone 2 and cooling section 3 three parts; Transition section 1 connects heating zone 2, and heating zone 2 connects cooling section 3, is provided with slide valve 4 between transition section 1 and the heating zone 2 and between heating zone 2 and the cooling section 3; Vacuum acquiring system is through pipeline connection to transition section 1 and heating zone 2; On transition section 1 and heating zone 2, also be provided with heat-exchange system 6.Heat-exchange system 6 is connected to power station afterheat steam system through heating steam passage 11.Utilize the power station afterheat steam to realize the heating function of heat-exchange system 6.
Vacuum acquiring system 5 is connected to cold filtration system 7.Vacuum acquiring system 5 is the steam jet pump, and this heat-exchange system 6 is a power with thermal power plant's afterheat steam.
Transition section 1 is a vacuum chamber structure with heating zone 2, and transition section 1 is made up of one or more Vakuumkammers 8, when transition section) when constituting, separate by slide valve 4 between the adjacent Vakuumkammer 8 by a plurality of Vakuumkammers 8.
As shown in Figure 3, transition section 1 also is provided with infrared heating device 9 with heating zone 2, is used for transition section 1 and heating zone 2 separated replenishing of thermal process.
Be provided with transport unit 10 in transition section 1, heating zone 2 and cooling section 3 inner bottoms, transport unit 10 is used to transmit waggon.That is to say that this dress can be delivered into brown coal the Vakuumkammer of transition section 1 and heating zone 2 or from Vakuumkammer brown coal exported.
As shown in Figure 1, the step of high efficient cryogenic vacuum brown coal process for upgrading is following:
After pulverization process, the thickness that tiling places waggon, brown coal on waggon, to tile is 20mm~30mm with the brown coal of exploiting out, and the effect of this thickness can be better, certainly, also can carry out adaptive adjustment according to the needs of reality.In addition, waggon is a kind of year coal container, and its size can be 2000mm * 5000mm * 300mm commonly used.
Open the slide valve of transition section outermost Vakuumkammer, waggon is sent into the transition section 1 of vacuum hydro-extraction chamber front end, subsequently the slide valve of opening cuts out; Be that the steam jet pump of power will begin the Vakuumkammer of transition section and heating zone to vacuumize with thermal power plant's afterheat steam simultaneously, vacuum degree in vacuum chamber can reach 3 * 10 3Pa~8 * 10 3About Pa, can well guarantee the effect of whole flow process like this;
Slide valve between transition section and the heating zone is opened, waggon through the transport unit of transition section bottom heating zone with 4-7 rice/minute speed travel forward and get into heating zone, when speed best results the time at 5 meters/minute; Brown coal in the waggon are heated in the process by transition section to heating zone, and brown coal are preheated to 15 ℃~20 ℃ at transition section, get into heating zone then;
After a waggon left transition section and sends into heating zone, transition section was closed with the slide valve between the heating zone, at this moment; Again transition section outside slide valve is opened; Next waggon will be sent into subsequently, so back and forth, guarantee that each Vakuumkammer all is in the state of operating at full capacity;
Brown coal after the preheating will continue heating after sending into heating zone, gradually brown coal will be heated to 60 ℃~90 ℃, according to processing requirement; Also can open infrared assisted heating device raising rate of heating for shortening heat-up time; Moisture in the brown coal will be along with the rising of temperature breaks away from gradually and is evaporated, and is extracted out by the steam jet pump, feeds the cold filtration system; After condensation, the collection of purifying, be used for the cooling water in power station, realize the comprehensive high-efficiency utilization of water;
The brown coal of finishing dealing with at the heating zone drying and upgrading are sent to cooling section from the heating under vacuum section; Adopt the mode of naturally cooling to be cooled to room temperature gradually at cooling section; From the terminal output of cooling section, deliver to thermal power plant subsequently, be used for thermal power plant's generating through follow-up extruding balling-up operation.
The heating of transition section and heating zone realizes through heat-exchange system, heat-exchange system with the power station afterheat steam as thermal source.
Upgrading process of the present invention is carried out under vacuum state, and under this state, the boiling point of water reduces greatly, when pressure drop to 8 * 10 3During Pa, the boiling point of water is 63.04 ℃, and the speed of evaporation improves greatly.Because brown coal are in the rough vacuum environment, therefore there is not the risk of spontaneous combustion or blast.Along with the continuous rising of temperature, the moisture content in the brown coal reduces gradually, considers that the too low meeting of winter temperature influence rate of heating, therefore just disposes infrared assisted heating device above Vakuumkammer.
The sustainable drying and upgrading that carries out brown coal of the present invention, the length of middle Vakuumkammer and quantity can increase according to the design production capacity, and the present invention per hour handles the brown coal ability can reach 150~200 tons, has improved the efficient of brown coal upgradings and the brown coal quality after the upgrading greatly.

Claims (10)

1. high efficient cryogenic vacuum brown coal device for improving quality; It is characterized in that: this device mainly comprises vacuum hydro-extraction chamber and vacuum acquiring system (5); Vacuum acquiring system (5) is connected to the vacuum hydro-extraction chamber through pipeline (12); The vacuum hydro-extraction chamber comprises transition section (1), heating zone (2) and cooling section (3) three parts; Transition section (1) connects heating zone (2), and heating zone (2) connects cooling section (3), is provided with slide valve (4) between transition section (1) and the heating zone (2) and between heating zone (2) and the cooling section (3); Vacuum acquiring system is through pipeline connection to transition section (1) and heating zone (2); On transition section (1) and heating zone (2), also be provided with heat-exchange system (6).
2. high efficient cryogenic vacuum brown coal device for improving quality according to claim 1, it is characterized in that: heat-exchange system (6) is connected to power station afterheat steam system through heating steam passage (11).
3. high efficient cryogenic vacuum brown coal device for improving quality according to claim 1 and 2, it is characterized in that: vacuum acquiring system (5) is connected to cold filtration system (7).
4. high efficient cryogenic vacuum brown coal device for improving quality according to claim 3 is characterized in that: vacuum acquiring system (5) is for being the steam jet pump of power with thermal power plant's afterheat steam.
5. high efficient cryogenic vacuum brown coal device for improving quality according to claim 1; It is characterized in that: transition section (1) and heating zone (2) are vacuum chamber structure; Transition section (1) is made up of one or more Vakuumkammers (8); When transition section (1) is made up of a plurality of Vakuumkammers (8), separate by slide valve (4) between the adjacent Vakuumkammer (8).
6. high efficient cryogenic vacuum brown coal device for improving quality according to claim 1 is characterized in that: transition section (1) and heating zone (2) also are provided with infrared heating device (9).
7. high efficient cryogenic vacuum brown coal device for improving quality according to claim 1 is characterized in that: the bottom inner at transition section (1), heating zone (2) and cooling section (3) is provided with transport unit (10).
8. the high efficient cryogenic vacuum brown coal process for upgrading that utilizes the described high efficient cryogenic vacuum of claim 1 brown coal device for improving quality to be implemented, it is characterized in that: the step of this technology is following:
After pulverization process, tiling places waggon with the brown coal of exploiting out,
Open the slide valve of transition section outermost Vakuumkammer, waggon is sent into the transition section 1 of vacuum hydro-extraction chamber front end, subsequently the slide valve of opening cuts out; Be that the steam jet pump of power will begin the Vakuumkammer of transition section and heating zone to vacuumize with thermal power plant's afterheat steam simultaneously, vacuum degree in vacuum chamber reaches 3 * 10 3Pa~8 * 10 3Pa;
Slide valve between transition section and the heating zone is opened, waggon through the transport unit of transition section bottom heating zone with 4-7 rice/minute speed travel forward and get into heating zone; Through the heat-exchange system heating, brown coal are preheated to 15 ℃~20 ℃ at transition section to brown coal in the waggon, get into heating zone then in by the process of transition section to heating zone;
After a waggon left transition section and sends into heating zone, transition section was closed with the slide valve between the heating zone, at this moment, again transition section outside slide valve was opened, and next waggon will be sent into subsequently;
Brown coal after the preheating will continue through the heat-exchange system heating after sending into heating zone; Gradually brown coal are heated to 60 ℃~90 ℃; Moisture in the brown coal will be along with the rising of temperature breaks away from gradually and is evaporated, and is extracted out by the steam jet pump, feeds the cold filtration system; After condensation, the collection of purifying, be used for the cooling water in power station, realize the comprehensive high-efficiency utilization of water;
The brown coal of finishing dealing with at the heating zone drying and upgrading are sent to cooling section from the heating under vacuum section, adopt the mode of naturally cooling to be cooled to room temperature gradually at cooling section, subsequently from the terminal output of cooling section.
9. high efficient cryogenic vacuum brown coal process for upgrading according to claim 8, it is characterized in that: the thickness that brown coal tile on waggon before sending into transition section is 20mm~30mm.
10. high efficient cryogenic vacuum brown coal process for upgrading according to claim 8; It is characterized in that: the power station afterheat steam is fed heat-exchange system as thermal source transition section and heating zone are heated, also can open infrared assisted heating device raising rate of heating at transition section and heating zone.
CN2012100780714A 2012-03-22 2012-03-22 High-efficiency low-temperature vacuum brown-coal upgrading device and process Pending CN102618346A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102965173A (en) * 2012-11-07 2013-03-13 中国重型机械研究院股份公司 Step-by-step modification upgrading system of brown coal
WO2014176792A1 (en) * 2013-04-28 2014-11-06 Cai Jingpeng Drying or low-temperature dry distillation device for lignite coal or low-metamorphic candle coal
WO2014201708A1 (en) * 2013-06-22 2014-12-24 Cai Jingpeng Drying or low-temperature destructive distillation method and apparatus for brown coal or low-deterioration long flame coal
CN105387689A (en) * 2014-09-09 2016-03-09 航天长征化学工程股份有限公司 Vacuum lignite drying device and using method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1073518A (en) * 1991-12-16 1993-06-23 石含玉 Quick vacuum freezing drying method with steam jet and equipment thereof
US6749425B1 (en) * 2003-03-26 2004-06-15 Jp Steel Plantech Co. Indirect heating furnace
CN2896159Y (en) * 2005-10-21 2007-05-02 长春吉大科学仪器设备有限公司 Grain low-temeprature vacuum drying device
CN101907383A (en) * 2010-08-10 2010-12-08 浙江大学 Belt-conveying drying system and method for realizing dehydration upgrading of lignite by using solar energy
CN202530060U (en) * 2012-03-22 2012-11-14 解欣业 High-efficiency and low-temperature vacuum brown coal upgrading device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1073518A (en) * 1991-12-16 1993-06-23 石含玉 Quick vacuum freezing drying method with steam jet and equipment thereof
US6749425B1 (en) * 2003-03-26 2004-06-15 Jp Steel Plantech Co. Indirect heating furnace
CN2896159Y (en) * 2005-10-21 2007-05-02 长春吉大科学仪器设备有限公司 Grain low-temeprature vacuum drying device
CN101907383A (en) * 2010-08-10 2010-12-08 浙江大学 Belt-conveying drying system and method for realizing dehydration upgrading of lignite by using solar energy
CN202530060U (en) * 2012-03-22 2012-11-14 解欣业 High-efficiency and low-temperature vacuum brown coal upgrading device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102965173A (en) * 2012-11-07 2013-03-13 中国重型机械研究院股份公司 Step-by-step modification upgrading system of brown coal
WO2014176792A1 (en) * 2013-04-28 2014-11-06 Cai Jingpeng Drying or low-temperature dry distillation device for lignite coal or low-metamorphic candle coal
WO2014201708A1 (en) * 2013-06-22 2014-12-24 Cai Jingpeng Drying or low-temperature destructive distillation method and apparatus for brown coal or low-deterioration long flame coal
CN105387689A (en) * 2014-09-09 2016-03-09 航天长征化学工程股份有限公司 Vacuum lignite drying device and using method thereof

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Application publication date: 20120801