CN103453753A - Efficient dedusting anti-condensation steam rotary drying process and lignite drying method - Google Patents
Efficient dedusting anti-condensation steam rotary drying process and lignite drying method Download PDFInfo
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Abstract
The invention relates to an efficient dedusting anti-condensation steam rotary drying process and a lignite drying method. The efficient dedusting anti-condensation steam rotary drying process comprises a dried material flow process, a drying steam flow process, a cloth bag dedusting anti-condensation flow process, a moisture carrying gas flow process and a heat tracing flow process, a cloth bag dust remover is used as an efficient dust removal device, superheated steam is used as cycled moisture carrying gas in the drying process, moisture removed by the dried materials is taken out of the steam rotary drying machine to form moisture carrying tail gas, and the moisture carrying tail gas is subjected to the efficient dust removal of the cloth bag dust remover and the saturated steam heat exchange temperature rise and returns to the steam rotary drying machine to form a closed cycle. The process and the method have the advantages that the consumption quantity of nitrogen gas in the drying moisture carrying process is effectively reduced, the system safety is improved, the goals of efficient dust removal, energy saving, environmental protection and water saving are realized, in addition, a mode of heating the clean superheated steam through heat exchange of a heat exchanger is adopted, the energy consumption is low, the safety is good, the energy is saved, the environment is protected, the economic cost is low, and the regulation performance is good.
Description
Technical field
The present invention relates to a kind of steam rotary drying process, relate in particular to a kind of steam rotary drying process of high-effective dust-removing anti-condensation, also relate to and a kind ofly utilize described technique to carry out dry method to brown coal.
Background technology
For some high-moisture mineral aggregates, such as brown coal, carry out large-scale application to it, must be by methods such as drying and upgradings to improve its use value.Take brown coal as representative, usually show characteristics inflammable, easy efflorescence in dry run, this has higher requirement in the design of the aspects such as safety, environmental protection to drying process.Aspect process safety, the drying mode that hot flue gas directly contacts with brown coal is difficult to long-term, stable maintaining below 5% because of oxygen content in hot flue gas, and there is larger potential safety hazard in system.So adopt of existing brown coal drying technique utilizes saturated vapor that the steam rotary drying mode of thermal source is provided more.Saturated vapor and brown coal are by the mediate contact of heat exchange tube wall and complete heat exchange, and this has been avoided heat medium to contact with the direct of brown coal, and this has improved the security of the thermal efficiency and system to a certain extent.In addition, for removing of the organic solvents such as toluene in dried material, because toluene can be by the wax for example out of a kind of extracting substances in material, then Residual Toluene is in material, if reclaim toluene just needs just can adopt the steam rotary superheated steam to take wet technique to carry out the intensification of material and make toluene evaporates, because toluene is inflammable and explosive material, its intensification subtractive process is very responsive to oxygen.
Current disclosed steam indirect heat-exchange rotation technique adopts the mode of nitrogen or nitrogen and hot-air combination to be taken wet, outstanding shortcoming more: 1, the consumption of nitrogen is large, and system operation cost is higher; 2, the fixed gas content in tail gas is high, is unfavorable for that water reclaims; 3, aspect the feature of environmental protection of technique, because moisture in brown coal is high, take in humid gas the aqueous vapor dividing potential drop large, be prone to the situation of dewfall in follow-up cleaner, this has limited the uses of cleaner efficiently such as sack cleaner to a great extent; 4, current disclosed steam indirect heat-exchange rotation technique adopts cyclone dust collectors more, because common cleaner is as lower as the efficiency of cyclone dust collectors, the dust concentration that system effluxes tail gas is higher, and this brings very large difficulty to follow-up waste heat recovery and water recovery process for effluxing tail gas.
Summary of the invention
In order to overcome the above problems, the objective of the invention is, a kind of steam rotary drying process and brown coal drying method of high-effective dust-removing anti-condensation are provided, it is usingd superheated steam and takes humid gas as the circulation of dry run, the moisture that brown coal are removed is taken steam rotary dryer out of, take wet tail gas and enter waste heat recovery or water recovery unit through sack cleaner dedusting rear portion, another part returns to steam rotary dryer and forms closed cycle after heating up with the saturated vapor heat exchange.
A kind of steam rotary drying process of high-effective dust-removing anti-condensation, comprise following flow process,
A. material flow is dried: the material that is dried is delivered in steam rotary dryer 4 by conveying device, and the dried material that is dried is discharged from steam rotary dryer 4;
B. dry steam flow process: I road saturated vapor enters into heating tube in steam rotary dryer 4 as drying source, carries out after indirect heat exchange forming condensed water with the material that is dried and discharges; The latent heat that the moisture absorption dry steam be dried in material discharges, evaporation forms fresh superheated steam;
C. bag-type dust anti-condensation flow process: fresh superheated steam is discharged from steam rotary dryer 4, enter into sack cleaner 9 dedustings, then improve after temperature by heater the clean superheated steam become after heating, be divided into two-way, one tunnel enters sack cleaner 9 again, enter the bulk temperature of the gas of sack cleaner 9 with adjusting, prevent sack cleaner 9 dewfall, another road enters the rear execution of steam rotary dryer 4 and takes wet, be mixed to form and take wet tail gas with the fresh superheated steam discharged in the dry materials process that is dried, leave steam rotary dryer 4, again enter deduster, repeat said process after the deduster dedusting, form closed cycle.
As a further improvement on the present invention, the clean superheated steam after described heating enters sack cleaner 9 after regulating by recyclegas return-air control valve 6 again, enters the overtemperature of the gas of sack cleaner 9 with raising.
As a further improvement on the present invention, described bag-type dust anti-condensation flow process C also comprises: III road saturated vapor enters sack cleaner 9 after controlling by middle pressure steam control valve 8, effectively prevents the generation of the interior dewfall phenomenon of sack cleaner 9.
As a further improvement on the present invention; in steam rotary dryer 4 cylindrical shells take the humid gas too high oxygen level time; III road saturated vapor is controlled and is entered in steam rotary dryer 4 cylindrical shells by protection valve 5, to reduce the oxygen content of taking humid gas in steam rotary dryer 4.
As a further improvement on the present invention, described III road saturated vapor pressure is 1.0-4.0 MPa.
As a further improvement on the present invention, described III road saturated vapor pressure is 1.3-2.5 MPa.
As a further improvement on the present invention, also comprise companion's thermal flow process D: the condensed water that steam rotary dryer 4 heating tube NeiⅠ road saturated vapor release heat form forms indirect steam 16 through flash evaporation tank 7 shwoots, for companion's heat of sack cleaner 9 or steam rotary dryer 4.
As a further improvement on the present invention, the described tail gas that wets of taking can enter waste heat recovery unit or water recovery unit after sack cleaner 9 dedustings.
As a further improvement on the present invention, the described tail gas that wets of taking enters the powder material recovery system through sack cleaner 9 dedusting gained powder materials.
As a further improvement on the present invention, described heater is electric heater or heat exchanger 11 or the combination of the two, preferred heat exchanger 11 or the combination of the two, while using heat exchanger, by taking II road saturated vapor to enter in heat exchanger and clean superheated steam indirect heat exchange mode, improve the temperature of clean superheated steam.
As a further improvement on the present invention, described heater preferred heat exchanger 11 or the combination of the two.
As a further improvement on the present invention, described bag-type dust anti-condensation flow process C also comprises: by regulating II road saturated vapor by-pass valve control 12, adjusting enters heat exchanger 11Ⅱ road saturated vapor flow, to improve the clean superheat steam temperature after heating, prevents that sack cleaner 9 from dewfall occurring.
As a further improvement on the present invention, also comprise companion's thermal flow process D: the condensed water that described II road saturated vapor forms after heat exchanger 11 heat exchange enters into flash evaporation tank 10 shwoots and forms indirect steam 16, for companion's heat of deduster or steam rotary dryer 4.
As a further improvement on the present invention, described II road saturated vapor pressure is 1.0-4.0 MPa.
As a further improvement on the present invention, described II road saturated vapor pressure is 1.3-2.5 MPa.
As a further improvement on the present invention, it is characterized in that, described I road saturated vapor pressure is 0.4-4.0 MP.
As a further improvement on the present invention, the preferred 0.6-2.0 MPa of described I road saturated vapor pressure.
A kind of brown coal drying method, is characterized in that, it is to realize by the steam rotary drying process of above a kind of high-effective dust-removing anti-condensation.
By the enforcement of above technical scheme, the present invention has obtained following beneficial effect and has been,
1, high-effective dust-removing, energy-conserving and environment-protective, water saving.The clean superheated steam that this technique is adjusted after heating by clean superheat steam temperature, the adjusting recyclegas return-air control valve 6 regulated after II road saturated vapor by-pass valve control 12 improves heating has improved with the measures such as mixing proportion of taking wet tail gas the temperature that enters sack cleaner gas.Simultaneously, still can not guarantee to enter rapidly system at the above Shi，Ⅲ of dew point road saturated vapor after the inlet gas temperature of sack cleaner is carried out above-mentioned adjusting, form superheated steam and above improve largely the inlet gas temperature.This combination control measure have thoroughly guaranteed the operation that sack cleaner is efficient, stable, thereby making dust-laden take wet tail gas is effectively purified, it is large that this has just been avoided tradition to take wet tail gas dust content, easily stop up the shortcomings such as heat exchanger, heat exchange efficiency are low in condensation recovery waste heat process, really play the effect of energy-saving and environmental protection, water saving.
2, reduce the consumption of nitrogen, increase security of system.It is 0.4-4.0 MPa that this Process I road saturated vapor adopts pressure, and preferably 0.6-2.0 MPa saturated vapor indirect heat exchange, utilize superheated steam to take wet drying mode, has changed tradition and has utilized nitrogen to take wet or air to take wet, nitrogen mode as a supplement.This technique is the upper consumption that reduces nitrogen largely, reduces operating cost.Simultaneously, it is safe that superheated steam is taken wet essence, can effectively control the oxygen content in drying system, stops the potential safety hazards such as brown coal burning.
3, adopt electric heater to improve the advantage of clean superheat steam temperature: (1), contamination-free produce, and can really realize " zero-emission ".(2), recycled offgas can be heated to higher temperature, because electric heater can reach higher temperature, so recycled offgas can be heated to the high temperature be heated to more than 300 ℃.(3), power supply is stable, technology is more ripe.The heat source temperature of electric heater is stable, and almost not fluctuation utilizes the electric heater heated air to belong to traditional mature technology simultaneously.(4), adjustment is accurate.Electric heater utilizes controllable silicon to carry out adjustment, and accuracy is high.
4, compare the advantage that adopts the vapor heat exchanger heat exchange to improve the temperature of clean superheated steam with electric heater: (1), energy consumption aspect: in general sense, electricity is that the acting of Steam Actuation steam turbine produces, there is the secondary conversion of steam energy, directly utilize the whole efficiency of steam Billy using electricity system to want high, this directly is presented as in large-scale system, utilizes the electric heater heat exchange to want Billy to want high by the steam energy consumption.Simultaneously, Steam Heating can obtain purer solidifying water, and solidifying water can also shwoot goes out low-pressure steam and realizes the secondary utilization; Its two, the solidifying water that steam heat-exchanging obtains also can utilize, this for water-deficient area highly significant.(2), security aspect: electric heater is compared with vapor heat exchanger, it wants high to the quality requirements of wanting heated air, be collected at heater surfaces if be heated the entrained dust of gas, this is more dangerous for electric heater, is prone to security incident.Vapor heat exchanger is not existed to such potential safety hazard, and it is at most to stop up heat exchanger.(3), sealing aspect: the sealing of electric heater is compared with vapor heat exchanger difficult (being mainly because a lot of circuit turnover electric heaters are arranged), and the sealing of vapor heat exchanger is relatively ripe, stable.(4), be heated the temperature requirement of gas: the heated final temperature of taking wet tail gas is not generally very high, utilizes Steam Heating can realize fully, and factory has such steam condition or has steam more than needed to utilize mostly.(5), economy aspect: the electric heater of same load is compared with vapor heat exchanger, and equipment investment is large.(6), modulability aspect: electric heater is compared with steam heat-exchanging, and modulability is poor.Steam heat-exchanging is controlled by steam control valve, and temperature, Flow-rate adjustment are simply, flexibly.
5, utilize steam heat-exchanging and electric heater to improve the advantageous feature of clean superheated steam: the characteristics of simultaneously using the technique maximum of two kinds of mode of heatings are at first to utilize steam heat-exchanging to carry out recycled offgas to heat up largely simultaneously, more accurate intensification (being similar to the relation of coarse adjustment and fine setting) is more among a small circle carried out in the recycling electrical heating, the temperature control inaccuracy of so both having avoided utilizing fully Steam Heating to produce, avoided again utilizing fully electrical heating energy consumption, shortcoming that cost is higher.
The accompanying drawing explanation
The process chart that Fig. 1 is the first embodiment of the present invention.
The process chart that Fig. 2 is the second embodiment of the present invention.
The process chart that Fig. 3 is the third embodiment of the present invention.
Wherein, 1. raw material cabin 2. belt constant feed weigher 3. conveying worm 4. steam rotary dryers 5. are protected valve 6. recyclegas return-air valve 7. electric heater 8.Ⅲ road saturated vapor control valve 9. sack cleaner 10. flash evaporation tank 11. heat exchanger 12.Ⅱ road saturated vapor control valve 13. system discharging valve 14. air-introduced machine 15. discharging cover 16. indirect steams.
The specific embodiment
The brown coal drying of below take is described in detail specific embodiment of the invention by reference to the accompanying drawings as example.
The process chart that Fig. 1 is the first embodiment of the present invention.As shown in Figure 1, comprise following flow process during the invention process.
Material flow is dried: brown coal are delivered in steam rotary dryer 4 by conveying worm 3 after belt constant feed weigher 2 is weighed by raw material cabin 1, and the direction that brown coal tilt along drying machine with the rotation of drying machine cylindrical shell flows from feed end to discharge end.In rotary dryer, 4 are furnished with the steam heat-exchanging tubulation, tubulation NeiⅠ road saturated vapor and brown coal mediate contact, carry out heat and transmit ，Ⅰ road saturated vapor release latent heat, brown coal are carried out to contact drying, and dried brown coal are discharged at 5 times discharge gates of discharging cover of drying machine tail end.
The dry saturated steam flow process: pressure is 0.4-4.0 MPa, preferably 0.6-2.0 MPaⅠ road saturated vapor is the drying source of brown coal, I road saturated vapor enters into the tubulation in revolution steam dryer 4 by the swivel joint of rotary dryer 4, form condensed water after discharging latent heat with brown coal indirect heat exchange to be dried, condensed water is discharged from drying machine 4 by swivel joint, enter other range sites by pipeline, such as condensed water recovery unit, tracing system etc.
Take the humid gas flow process: the latent heat that the moisture absorption I road saturated vapor condensation in brown coal discharges, evaporation and then form fresh superheated steam, fresh superheated steam under the attraction of air-introduced machine 14 by steam rotary dryer discharging cover 15 sack cleaner 9 that enters into suitable for reading, because above-mentioned mist is carried a certain amount of coal dust secretly, become comparatively clean superheated steam after sack cleaner 9 high-effective dust-removings, dedusting gained fines enters the fines recovery unit.Clean superheated steam is divided into two-way after air-introduced machine 14, and a road enters follow-up waste heat recovery or water recovery unit after system discharging valve 13 is discharged drying system; After another Lu YuⅡ road saturated vapor heat exchange in heat exchanger 11 heats up and improves the degree of superheat, with the conveying worm 3 of steam rotary dryer 4, be connected, enter the rear execution of steam rotary dryer 4 and take wet function, the superheated steam of this road cleaning with carry a certain amount of coal dust after the live steam discharged in the brown coal drying process mixes secretly and leave drying machine 4 and form and take wet tail gas, enter sack cleaner 9, after sack cleaner 9 high-effective dust-removings, repeat said process.In addition; during gas oxygen too high levels in steam rotary dryer (too high oxygen level generally refers to that the oxygen content (volume fraction of oxygen) of taking in humid gas surpasses 3%); generation for fear of security incident; III road saturated vapor is controlled by protection valve 5; enter in steam rotary dryer 4 cavitys by conveying device rapidly, and reduce rapidly the oxygen content in steam rotary dryer 4.In steam rotary dryer, oxygen content is higher generally refers to when oxygen content (volume fraction of oxygen) in gas in steam rotary dryer surpasses 3%, that is:, when the oxygen content of taking humid gas surpasses 3%, system should take corresponding intervening measure to reduce oxygen content.Saturated vapor ,Ⅲ road, II road saturated vapor pressure is 1.0-4.0 MPa, preferably 1.3-2.5 MPa.
Bag-type dust anti-condensation flow process: the clean superheat steam temperature after the heating that enters conveying worm 3 is low easily to be caused when rotary dryer 4 is interior occurs that dewfall or drying machine discharging cover 15 upper outlet gas temperatures are low, can pass through to regulate II road saturated vapor valve 12 to increase the flow of saturated steam in heat exchanger 11, and then increase the clean superheated steam outlet temperature after heat exchanger 11 heating.II road saturated vapor is regulated the rear and above-mentioned overtemperature that the wet tail gas of taking of sack cleaner 9 mixes to improve the gas that enters sack cleaner 9 again that enters by recyclegas return air valve 6 in addition, prevents the cloth bag dewfall.In the situation of recyclegas return air valve 6 standard-sized sheets, still can not guarantee to enter the gas temperature of sack cleaner 9 when dew point is above, open III road saturated vapor valve 8 and pass into saturated vapor in the gas pipeline that enters sack cleaner, saturated vapor enters after pipeline after decompression naturally and forms superheated steam and further improved the gas temperature that enters sack cleaner.
Companion's thermal flow process: through heat exchanger 11 heating system circulation Ⅱ road saturated vapors, the condensed water formed after heat exchange enters into flash evaporation tank sudden strain of a muscle 10 and sends indirect steam 16, the companion's heat that can be used for system, as deduster and steam rotary dryer, to improve the overall thermal utilization rate.Steam rotary dryer 4 heating tube NeiⅠ road saturated vapor release heat form condensed water, and cool solidifying water forms indirect steam 16 through flash evaporation tank 10 shwoots, can be used for companion's heat of deduster or steam rotary dryer 4.
About each road saturated vapor pressure preferentially scope choose according to being mainly to consider the process operation economy, particularly: lower than the lower of preferable range, prescribe a time limit, the pressure of saturated vapor is lower, the pressure of the condensed water formed after the saturated vapor heat exchange is corresponding lower, condensed water should not be discharged from equipment, and this can heat exchanging have a negative impact; Higher than preferable range upper, in limited time the pressure of saturated vapor is higher, generally is used for generating but not be used for heat exchange on the high-pressure saturated steam commercial Application, and simultaneously, the material of high-pressure saturated steam heat exchange heat exchanging equipment, pipeline etc. is had relatively high expectations, and equipment investment is larger.
Because the second embodiment of the present invention, the third embodiment mainly are the mode of heating of clean superheated steam different from the difference of the first embodiment, the second embodiment adopts the form of electric heater heating, and the third embodiment adopts heat exchanger heat exchange and electric heater to add the mode of thermal.Therefore only the enforcement of different mode of heatings is described in detail, repeats no more for the part of other identical flow processs.
As described in Figure 2, take wet tail gas and become comparatively clean superheated steam after sack cleaner 9 high-effective dust-removings, after air-introduced machine 14, be divided into two-way, a road enters follow-up waste heat recovery or water recovery unit after system discharging valve 13 is discharged drying system; Another road with by after electric heater 7 heat temperature raisings, with the conveying worm 3 of steam rotary dryer 4, be connected, enter the rear execution of steam rotary dryer 4 and take wet function.The difference of the present embodiment and the first embodiment is, mode due to 7 heating of the present embodiment employing electric heater, make electricity consumption as the conversion thermal source, no longer need picture to use heat exchanger and need adopt II road saturated vapor as thermal source, the mode by heat exchange improves the temperature of taking the tail gas that wets.Simultaneously, owing to no longer adopting II road saturated vapor by the heat exchanger heat exchange, also just no longer there is the saturated vapor heat exchange condensation of II road, enter the process that flash evaporation tank 10 shwoots form indirect steam 16.Adopt electric heater to improve the advantage of clean superheat steam temperature: (1), contamination-free produce, and can really realize " zero-emission ".(2), recycled offgas can be heated to higher temperature, because electric heater can reach higher temperature, so recycled offgas can be heated to the high temperature be heated to more than 300 ℃.(3), power supply is stable, technology is more ripe.The heat source temperature of electric heater is stable, and almost not fluctuation utilizes the electric heater heated air to belong to traditional mature technology simultaneously.(4), adjustment is accurate.Electric heater utilizes controllable silicon to carry out adjustment, and accuracy is high.
As shown in Figure 3, take wet tail gas and form clean superheated steam through sack cleaner 9 dedustings, clean superheated steam after the heating formed by the saturated vapor heat exchange of heat exchanger 11YuⅡ road, further, by electric heater 7 heat temperature raisings, this kind of mode of heating better guaranteed to take the temperature of gas in wet flow process and bag-type dust anti-condensation flow process.Utilize steam heat-exchanging and electric heater to improve the advantageous feature of clean superheated steam: the characteristics of simultaneously using the technique maximum of two kinds of mode of heatings are at first to utilize steam heat-exchanging to carry out recycled offgas to heat up largely simultaneously, more accurate intensification (being similar to the relation of coarse adjustment and fine setting) is more among a small circle carried out in the recycling electrical heating, the temperature control inaccuracy of so both having avoided utilizing fully Steam Heating to produce, avoided again utilizing fully electrical heating energy consumption, shortcoming that cost is higher.
In addition, above embodiment is not limited to be applied on the drying to brown coal, such as being applied to removing of the organic solvent such as toluene in material.
Claims (18)
1. the steam rotary drying process of a high-effective dust-removing anti-condensation comprises following flow process:
A. material flow is dried: the material that is dried is delivered in steam rotary dryer (4) by conveying device, and the dried material that is dried is discharged from steam rotary dryer (4);
B. dry steam flow process: I road saturated vapor enters into heating tube in steam rotary dryer (4) as drying source, carries out after indirect heat exchange forming condensed water with the material that is dried and discharges; The latent heat that the moisture absorption dry steam be dried in material discharges, evaporation forms fresh superheated steam;
C. bag-type dust anti-condensation flow process: fresh superheated steam is discharged from steam rotary dryer (4), enter into sack cleaner (9) dedusting, then improve after temperature by heater the clean superheated steam become after heating, be divided into two-way, one tunnel enters sack cleaner (9) again, enter the bulk temperature of the gas of sack cleaner (9) with adjusting, prevent sack cleaner (9) dewfall, after another road enters steam rotary dryer (4), execution is taken wet, be mixed to form and take wet tail gas with the fresh superheated steam discharged in the dry materials process that is dried, leave steam rotary dryer (4), again enter deduster, repeat said process after the deduster dedusting, form closed cycle.
2. the steam rotary drying process of a kind of high-effective dust-removing anti-condensation according to claim 1, it is characterized in that, after clean superheated steam after described heating is regulated by recyclegas return-air control valve (6), again enter sack cleaner (9), enter the overtemperature of the gas of sack cleaner (9) with raising.
3. the steam rotary drying process of a kind of high-effective dust-removing anti-condensation according to claim 2, it is characterized in that, described bag-type dust anti-condensation flow process C also comprises: III road saturated vapor enters sack cleaner (9) after controlling by middle pressure steam control valve (8), effectively prevents the generation of the interior dewfall phenomenon of sack cleaner (9).
4. the steam rotary drying process of a kind of high-effective dust-removing anti-condensation according to claim 3; it is characterized in that; in steam rotary dryer (4) cylindrical shell take the humid gas too high oxygen level time; III road saturated vapor is controlled and is entered in steam rotary dryer (4) cylindrical shell by protection valve (5), to reduce the oxygen content of taking humid gas in steam rotary dryer (4).
5. the steam rotary drying process of a kind of high-effective dust-removing anti-condensation according to claim 4, is characterized in that, described III road saturated vapor pressure is 1.0-4.0 MPa.
6. the steam rotary drying process of a kind of high-effective dust-removing anti-condensation according to claim 5, is characterized in that, described III road saturated vapor pressure is 1.3-2.5 MPa.
7. according to the steam rotary drying process of the described a kind of high-effective dust-removing anti-condensation of claim 1-6 any one, it is characterized in that, also comprise companion's thermal flow process D: the condensed water that steam rotary dryer (4) heating tube NeiⅠ road saturated vapor release heat forms forms indirect steam (16) through flash evaporation tank (7) shwoot, for companion's heat of sack cleaner (9) or steam rotary dryer (4).
8. according to the steam rotary drying process of the described a kind of high-effective dust-removing anti-condensation of claim 1-6 any one, it is characterized in that, the described tail gas that wets of taking can enter waste heat recovery unit or water recovery unit after sack cleaner (9) dedusting.
9. according to the steam rotary drying process of the described a kind of high-effective dust-removing anti-condensation of claim 1-6 any one, it is characterized in that, the described tail gas that wets of taking enters the powder material recovery system through sack cleaner (9) dedusting gained powder material.
10. according to the steam rotary drying process of the described a kind of high-effective dust-removing anti-condensation of claim 1-6 any one, it is characterized in that, described heater is electric heater or heat exchanger (11) or the combination of the two, while using heat exchanger, by taking (II) road saturated vapor to enter in heat exchanger and clean superheated steam indirect heat exchange mode, improve the temperature of clean superheated steam.
11. the steam rotary drying process of a kind of high-effective dust-removing anti-condensation according to claim 10, is characterized in that, described heater preferred heat exchanger (11) or the combination of the two.
12. a kind of brown coal drying technique of utilizing superheated steam according to claim 11, it is characterized in that, described bag-type dust anti-condensation flow process C also comprises: by regulating (II) road saturated vapor by-pass valve control (12), adjusting enters heat exchanger (11) Ⅱ road saturated vapor flow, to improve the clean superheat steam temperature after heating, prevent that sack cleaner (9) from dewfall occurring.
13. the steam rotary drying process of a kind of high-effective dust-removing anti-condensation according to claim 12, it is characterized in that, also comprise companion's thermal flow process D: the condensed water that described II road saturated vapor forms after heat exchanger (11) heat exchange enters into flash evaporation tank (10) shwoot and forms indirect steam (16), for companion's heat of deduster or steam rotary dryer (4).
14. the steam rotary drying process according to the described a kind of high-effective dust-removing anti-condensation of claim 10-13 any one, is characterized in that, described II road saturated vapor pressure is 1.0-4.0 MPa.
15. the steam rotary drying process of a kind of high-effective dust-removing anti-condensation according to claim 14, is characterized in that, described II road saturated vapor pressure is 1.3-2.5 MPa.
16. the steam rotary drying process according to the described a kind of high-effective dust-removing anti-condensation of claim 1-6 any one, is characterized in that, described I road saturated vapor pressure is 0.4-4.0 MPa.
17. the steam rotary drying process of a kind of high-effective dust-removing anti-condensation according to claim 16, is characterized in that, described I road saturated vapor pressure is 0.6-2.0 MPa.
18. a brown coal drying method, is characterized in that, it is realized by the described technique of the arbitrary claim of claim 1-17.
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| CN104197684A (en) * | 2014-08-29 | 2014-12-10 | 山东山大能源环境有限公司 | Water-recyclable superheat steam drying lignite system and process method thereof |
| CN105091546A (en) * | 2014-05-20 | 2015-11-25 | 天华化工机械及自动化研究设计院有限公司 | Generator set high-water-content and low-heating-value lignite drying and water recycling method and device |
| CN113137610A (en) * | 2020-01-17 | 2021-07-20 | 北京航天石化技术装备工程有限公司 | Household garbage drying system and method |
| CN113237084A (en) * | 2021-05-10 | 2021-08-10 | 哈尔滨锅炉厂预热器有限责任公司 | Energy-saving steam air preheater system |
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| CN105091546A (en) * | 2014-05-20 | 2015-11-25 | 天华化工机械及自动化研究设计院有限公司 | Generator set high-water-content and low-heating-value lignite drying and water recycling method and device |
| CN105091546B (en) * | 2014-05-20 | 2017-06-06 | 天华化工机械及自动化研究设计院有限公司 | A kind of generating set high-moisture, low heat value brown coal drying and water recovery method and its device |
| CN104197684A (en) * | 2014-08-29 | 2014-12-10 | 山东山大能源环境有限公司 | Water-recyclable superheat steam drying lignite system and process method thereof |
| CN113137610A (en) * | 2020-01-17 | 2021-07-20 | 北京航天石化技术装备工程有限公司 | Household garbage drying system and method |
| CN113237084A (en) * | 2021-05-10 | 2021-08-10 | 哈尔滨锅炉厂预热器有限责任公司 | Energy-saving steam air preheater system |
| CN115371414A (en) * | 2022-09-15 | 2022-11-22 | 南漳龙蟒磷制品有限责任公司 | Environment-friendly calcium hydrophosphate steam drying method |
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| CN103453753B (en) | 2015-08-26 |
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Address after: 250000 Shandong city of Ji'nan province high tech Zone Shun Road No. 2000 Shun Tai Plaza No. 2 building 15 room 1501 Patentee after: Shandong Tianli energy Limited by Share Ltd Address before: 250000, Shandong Province, Ji'nan hi tech Zone, No. 554 Feng Feng Road, environmental science and Technology Park, building 8, Feng Feng building, room 230 Patentee before: Shandong Tianli Drying Co., Ltd. |
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