CN104771978A - Circulating gas washing-absorbing system and washing-absorbing method for air current type drying machine - Google Patents
Circulating gas washing-absorbing system and washing-absorbing method for air current type drying machine Download PDFInfo
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- CN104771978A CN104771978A CN201510209595.6A CN201510209595A CN104771978A CN 104771978 A CN104771978 A CN 104771978A CN 201510209595 A CN201510209595 A CN 201510209595A CN 104771978 A CN104771978 A CN 104771978A
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- recyclegas
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Abstract
The invention discloses a circulating gas washing-absorbing system and a washing-adsorbing method for an air current type drying machine, and belongs to the field of air current type drying equipment. The circulating gas washing-absorbing system and the washing-absorbing method for the air current type drying machine have the advantages that the drying efficiency is comparatively high, drying time is comparatively short, and the energy consumption for material drying and cost can be lowered. An absorption tower is utilized, solvents in circulating gas is absorbed through absorption liquid, meanwhile, the absorption liquid is pumped in the absorption tower after being cooled by an arranged absorption liquid cooler, and heat transfer by contacting and mass transfer by contacting can be achieved when the absorption liquid makes contact with the circulating gas, therefore, the effect of heat transfer and mass transfer can be improved greatly, the content of the solvents in the circulating gas exhausted out of the top of the absorption tower is lowered greatly, the content of the solvents in the circulating gas reentering drying machine is comparatively low, the absorption rate on the solvents in the circulating gas can be improved, the drying time can be shortened, the energy consumption for material drying is lowered, and the cost is saved.
Description
Technical field
The present invention relates to air-flowing type drying plant field, the circulation especially for lower and inflammable, the explosive or poisonous solvent of boiling point is dried and absorbs; Be specifically related to a kind of air current drying machine recyclegas washing absorption system and washing absorption method.
Background technology
At present, during for situation containing lower and inflammable, the explosive or poisonous solvent of boiling point in material to be dried, usually industrial explosion-proof air current drying machine is adopted.And consider the special nature of solvent, inflammable, explosive or poisonous described above, solvent also usually costly in addition, therefore directly directly can not be discharged into drying the rear recyclegas containing above-mentioned solvent in air on the one hand, also should recycle solvent on the other hand as far as possible.Further, be generally special gas for the recyclegas absorbing this kind solvent, as usually adopted inert gas or nitrogen etc., the production cost of its recyclegas itself is higher, therefore in order to cost-saving, is usually recycled.For the processing mode of its recyclegas in existing industrial explosion-proof air current drying machine, general employing one-level or multi-stage condensing process; By gas-liquid separator, the solvent liquid that recyclegas and condensation go out is separated again after condensation, to reach the object reducing recyclegas wherein solvent; Again the recyclegas after process is passed through blower fan, heater assembly again afterwards, again send in dryer, to realize the recovery of solvent and recycling recyclegas.But, adopt the processing mode of above-mentioned one-level or multi-stage condensing and gas-liquid separator, because it is the difference of the saturated content utilizing solvent under different temperatures, pressure environment in recyclegas and the separation and recovery realized solvent, it is lower to the absorptivity of the solvent of recyclegas, the recyclegas itself come back in dryer is made to contain higher solvent, cause the drying efficiency of material comparatively slow, drying time is longer; Increase drying materials energy consumption and cost.
Summary of the invention
It is higher that the technical problem that the present invention solves is to provide a kind of drying efficiency, and drying time is shorter, can reduce the air current drying machine recyclegas washing absorption system of drying materials energy consumption and cost and adopt the washing absorption method of this system.
The technical solution adopted for the present invention to solve the technical problems is: air current drying machine recyclegas washing absorption system, comprise dryer, recyclegas is cooler just, circulating fan and heater, described dryer, recyclegas is cooler just, circulating fan and heater are by gas circulation line serial communication successively, the first gas circulation line between cooler and circulating fan of recyclegas is provided with absorption tower, described recyclegas just cooler is communicated with the air inlet port of bottom, absorption tower, described circulating fan is communicated with the air outlet at top, absorption tower, absorption tower is also provided with the liquid circulation line for making the absorbing liquid of inside, absorption tower circulate, bottom in absorption tower is communicated with top by described liquid circulation line, liquid circulation line is disposed with circulating pump and absorbing liquid cooler.
Further: described absorption tower is plate column or packed tower.
Further: the air outlet place at the top in absorption tower is provided with gas-liquid separator.
Further: the gas circulation line between circulating fan and heater is also provided with pre-heater.
Further: described absorbing liquid cooler comprises absorbing liquid one-level cooler and the absorbing liquid secondary coolers of series winding.
Further: also comprise absorbing liquid tank level control system, described absorbing liquid tank level control system comprises and being arranged on absorption tower for detecting the liquid level gauge of absorbing liquid height in absorption tower, the triplate line be communicated with liquid circulation line, being arranged on control valve on triplate line and control system; Described liquid level gauge and control valve respectively with control system signal communication.
In addition, the present invention also provides a kind of air current drying machine recyclegas washing absorption method, adopt said flow formula dryer recyclegas washing absorption system, the recyclegas with solvent of discharging in dryer, through recyclegas just cooler cooling, enter in absorption tower from the air inlet port of bottom, absorption tower afterwards, and upwards flow along absorption tower; The absorbing liquid of absorption tower inner bottom part by circulating pump pumping, and cools through absorbing liquid cooler, enters in absorption tower afterwards, and flow downward along absorption tower from the top on absorption tower; With the recyclegas of solvent and cooled absorbing liquid by flowing in opposite directions in absorption tower, carrying out transmission of heat by contact and contact mass transfer simultaneously, the solvent carried in recyclegas is absorbed by liquid absorption; Discharged by the air outlet of the recyclegas after lyosoption from top, absorption tower, then sent into after heater heats by circulating fan and again send in dryer.
Further: the air outlet place at the top in absorption tower is provided with gas-liquid separator, is discharged after gas-liquid separator by the recyclegas after lyosoption from the air outlet at top, absorption tower.
Further: when being provided with absorbing liquid tank level control system, make absorbing liquid liquid level in absorption tower by control system in setting range by control and regulation valve.
Further: described solvent is inflammable, explosive and/or poisonous material; Described recyclegas is inert gas or nitrogen.
The invention has the beneficial effects as follows: by adopting absorption tower, absorbing liquid is utilized to absorb the solvent in recyclegas, pass into again in absorption tower after absorbing liquid cooler being set absorbing liquid is cooled simultaneously, absorbing liquid can be realized like this when contacting with recyclegas, both transmission of heat by contact can be realized, contact mass transfer can be realized again, therefore heat transfer and mass transfer effect can greatly be improved, the solvent of the recyclegas of discharging from top, absorption tower is reduced greatly, therefore make the solvent of the recyclegas reentered in dryer lower, when equal air demand, the drying effect of the present invention to material is better, therefore drying time can be shortened, reduce drying materials energy consumption, cost-saving.In addition, the present invention also can arrange absorbing liquid tank level control system, guarantees absorbing liquid in absorption tower all the time in the processing range of setting.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of air current drying machine recyclegas washing absorption system of the present invention;
Be labeled as in figure: dryer 1, recyclegas be cooler 2, circulating fan 3, heater 4, pre-heater 41, gas circulation line 5, absorption tower 6, air inlet port 61, air outlet 62, gas-liquid separator 63, liquid circulation line 7, circulating pump 8, absorbing liquid cooler 9, liquid level gauge 10, control valve 101, control system 102 just.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is further described.
As shown in Figure 1, air current drying machine recyclegas washing absorption system of the present invention, comprise dryer 1, recyclegas is cooler 2 just, circulating fan 3 and heater 4, described dryer 1, recyclegas is cooler 2 just, circulating fan 3 and heater 4 are by gas circulation line 5 serial communication successively, the first gas circulation line between cooler 2 and circulating fan 3 of recyclegas is provided with absorption tower 6, described recyclegas just cooler 2 is communicated with the air inlet port 61 of bottom, absorption tower 6, described circulating fan 3 is communicated with the air outlet 62 at top, absorption tower 6, absorption tower 6 is also provided with the liquid circulation line 7 for making the absorbing liquid of inside, absorption tower circulate, bottom in absorption tower 6 is communicated with top by described liquid circulation line 7, liquid circulation line 7 is disposed with circulating pump 8 and absorbing liquid cooler 9.
The present invention realizes recyclegas and contacts with the direct of absorbing liquid in absorption tower 6, and realizes heat transfer and mass transfer in the process of contact.Wherein heat transfer refers to: absorbing liquid is after absorbing liquid cooler 9 cools, and it is lower to require that its temperature enters the temperature of the recyclegas on absorption tower relatively, can cool recyclegas, the condensation effect of solvent can be improved, improve the absorptivity to solvent; And mass transfer refers to: the solvent in the direct absorption cycle gas of absorbing liquid, certainly, require during its precondition that solvent is soluble in absorbing liquid, therefore should select according to the character of solvent when Selective absorber liquid, during as being alcohols material for solvent, can directly adopt distilled water as absorbing liquid.Owing to there is the absorption pattern of direct contact mass transfer, therefore the absorptivity of solvent obtains great enhancing.
Therefore, the present invention adopts absorbing liquid and recyclegas to carry out direct transmission of heat by contact and contact mass transfer, go out for liquid solvent relative to adopting condensation method condensation from recyclegas in prior art, the present invention revolutionizes its condensation to solvent in recyclegas and reclaims principle, the present invention is better than the condensing mode adopted in prior art greatly to the absorptivity of solvent, the solvent of recyclegas of discharging from top, absorption tower is reduced greatly, recyclegas can be improved and reenter drying effect to material after in dryer 1; In addition, the processing speed of the present invention to recyclegas is also obviously better than prior art.
As for absorption tower 6, conventional plate column or packed tower generally can be adopted.Specifically can select according to actual needs.
In order to realize cooling further the recyclegas in absorption tower 6, to improve the assimilation effect to solvent.The present invention is also provided with absorbing liquid cooler 9 on liquid circulation line 7, cools absorbing liquid.Further, have good cooling effect in order to reach to absorbing liquid, absorbing liquid cooler 9 is set to the absorbing liquid one-level cooler 91 and the absorbing liquid secondary coolers 92 that comprise series winding by the present invention further.
In addition, when considering that the air outlet 62 at the top in absorption tower 6 discharges the recyclegas after processing, easily carry the liquid substances such as a part of absorbing liquid or liquid flux, therefore gas-liquid separator 63 can be set for air outlet 62 place at top further in absorption tower 6; To reduce the liquid substance carried from the recyclegas of air outlet 62 discharge.
In addition, heater 4 usually employing Steam Heating mode realizes the heating to recyclegas, and enter temperature before dryer 1 to improve recyclegas, also the gas circulation line 5 between circulating fan 3 and heater 4 can also be provided with pre-heater 41, and the steam condensate (SC) of discharging in heater 4 can be passed in pre-heater 41 again, steam thermal energy is fully used; Such recyclegas is tentatively heated through pre-heater 41, is then heated further by heater 4, and reaches the requirement temperature entered in dryer 1 of setting; Usually this requires that temperature is at about 100 °; Certainly, actual temp can be determined according to the concrete condition of drying product.
Adopt air current drying machine recyclegas washing absorption system of the present invention, as follows to the concrete grammar of recyclegas washing absorption: the recyclegas with solvent of discharging in dryer 1, cool through the first cooler 2 of recyclegas, enter in absorption tower 6 from the air inlet port 61 of bottom, absorption tower 6 afterwards, and upwards flow along absorption tower; The absorbing liquid of absorption tower 6 inner bottom part by circulating pump 8 pumping, and cools through absorbing liquid cooler 9, enters in absorption tower 6 afterwards, and flow downward along absorption tower from the top on absorption tower 6; With the recyclegas of solvent and cooled absorbing liquid by flowing in opposite directions in absorption tower, carrying out transmission of heat by contact and contact mass transfer simultaneously, the solvent carried in recyclegas is absorbed by liquid absorption; Discharged by the air outlet 62 of the recyclegas after lyosoption from top, absorption tower 6, then sent into after heater 4 heats by circulating fan 3 and again send in dryer 1.Relate to the circulation of two kinds of materials in this method, be respectively the circulation of the recyclegas along " dryer 1 → recyclegas is cooler 2 → absorption tower 6 → circulating fan, 3 → heater, 4 → dryer 1 just "; And the circulation of absorbing liquid along " bottom absorption tower → top → absorption tower, circulating pump 8 → absorbing liquid cooler 9 → absorption tower bottom ".Recyclegas in this two circulation and absorbing liquid realize transmission of heat by contact and contact mass transfer in absorption tower 6.
When air outlet 62 place at the top in absorption tower 6 is provided with gas-liquid separator 63, discharged from the air outlet 62 at top, absorption tower 6 after gas-liquid separator 63 by the recyclegas after lyosoption.To reduce the liquid substance contained from the recyclegas that the air outlet 62 at top, absorption tower 6 is discharged.
In the present invention, the absorbing liquid liquid level at the bottom of the tower of absorption tower 6 is along with constantly carrying out solvent absorption, and its absorbing liquid liquid level can constantly raise.Its main cause is that the solvent absorbed constantly increases, and the portion of water of simultaneously drying out from oven dry product with solvent also can be absorbed by liquid absorption, and finally makes absorbing liquid get more and more.For ensureing that absorbing liquid liquid level at the bottom of absorption tower 6 tower is in the scope that normal process allows, the present invention is also provided with absorbing liquid tank level control system, and described absorbing liquid tank level control system comprises and being arranged on absorption tower 6 for detecting the liquid level gauge 10 of absorbing liquid height in absorption tower 6, the triplate line be communicated with liquid circulation line 7, being arranged on control valve 101 on triplate line and control system 102; Described liquid level gauge 10 and control valve 101 respectively with control system 102 signal communication; Like this, by control system 102 by the judgement to the testing result of liquid level gauge 10, according to judged result control and regulation valve 101, the absorbing liquid liquid level in absorption tower 6 is remained in setting range simultaneously.As for control system 102, usually adopt DCS control system.
Certainly, the present invention is directed solvent is inflammable, explosive and/or poisonous material.Therefore, for the oven dry of ordinary matter, during as oven dry only for moisture, then basic without the need to adopting system of the present invention or method, the gas now got rid of from dryer 1 can directly be disposed in air, if be separated the moisture in gas again, then can caused the unnecessary wasting of resources, lose more than gain.
Consider in the present invention for the normally above-mentioned special material of solvent, therefore, recyclegas generally also be there are certain requirements, usually selects recyclegas to be inert gas or nitrogen.Certainly, concrete recyclegas, should select according to the character of solvent.
Here adopts the Data Comparison record under described system and method for the present invention and aging method when actual product is dried:
Table 1 the inventive method condition dries a batch products required time
A batch products required time is dried under table 2 aging method condition
Lower 2014 the like products moons of table 3 the inventive method condition consume electric energy, steam statistical form
Lower 2013 the like products moons of table 4 aging method condition consume electric energy, steam statistical form
As can be seen from upper table 1 and table 2, after adopting system and method for the present invention, the average drying time of one batch products is shortened greatly relative under aging method, dries one batch shorten to oven dry in present average 5.9 hours a batch by original average 12.5 hours.Can find out from table 3 and table 4 and adopt after system and method for the present invention, dry the steam that product per ton consumes and be reduced to 11.77T by originally adopting the average 25.3T under aging method; And dry the electric energy that product per ton consumes and be reduced to 2514KWH by the 3693KWH under original aging method.As can be seen here, utilize system and method for the present invention from actual performance, greatly can reduce product drying time and unit product baking needed energy consumption, can economize on resources, reduce costs.
Claims (10)
1. air current drying machine recyclegas washing absorption system, comprise dryer (1), recyclegas is cooler (2) just, circulating fan (3) and heater (4), described dryer (1), recyclegas is cooler (2) just, circulating fan (3) and heater (4) are by gas circulation line (5) serial communication successively, it is characterized in that: on the first gas circulation line between cooler (2) and circulating fan (3) of recyclegas, be provided with absorption tower (6), described recyclegas just cooler (2) is communicated with the air inlet port (61) of absorption tower (6) bottom, described circulating fan (3) is communicated with the air outlet (62) at absorption tower (6) top, absorption tower (6) are also provided with the liquid circulation line (7) for making the absorbing liquid of inside, absorption tower circulate, bottom in absorption tower (6) is communicated with top by described liquid circulation line (7), liquid circulation line (7) is disposed with circulating pump (8) and absorbing liquid cooler (9).
2. air current drying machine recyclegas washing absorption system as claimed in claim 1, is characterized in that: described absorption tower (6) are plate column or packed tower.
3. air current drying machine recyclegas washing absorption system as claimed in claim 1, is characterized in that: air outlet (62) place at the top in absorption tower (6) is provided with gas-liquid separator (63).
4. air current drying machine recyclegas washing absorption system as claimed in claim 1, is characterized in that: the gas circulation line (5) between circulating fan (3) and heater (4) is also provided with pre-heater (41).
5. air current drying machine recyclegas washing absorption system as claimed in claim 1, is characterized in that: described absorbing liquid cooler (9) comprises absorbing liquid one-level cooler (91) and the absorbing liquid secondary coolers (92) of series winding.
6. the air current drying machine recyclegas washing absorption system according to any one of claim 1 to 5, it is characterized in that: also comprise absorbing liquid tank level control system, described absorbing liquid tank level control system comprises and being arranged on absorption tower (6) for detecting the liquid level gauge (10) of absorbing liquid height in absorption tower (6), the triplate line be communicated with liquid circulation line (7), being arranged on control valve (101) on triplate line and control system (102); Described liquid level gauge (10) and control valve (101) respectively with control system (102) signal communication.
7. air current drying machine recyclegas washing absorption method, it is characterized in that: adopt the air current drying machine recyclegas washing absorption system according to any one of the claims 1 to 6, the recyclegas with solvent of discharging in dryer (1), through recyclegas just cooler (2) cooling, enter in absorption tower (6) from the air inlet port (61) of absorption tower (6) bottom afterwards, and upwards flow along absorption tower; The absorbing liquid of absorption tower (6) inner bottom part is by circulating pump (8) pumping, and cool through absorbing liquid cooler (9), enter in absorption tower (6) from the top of absorption tower (6) afterwards, and flow downward along absorption tower; With the recyclegas of solvent and cooled absorbing liquid by flowing in opposite directions in absorption tower, carrying out transmission of heat by contact and contact mass transfer simultaneously, the solvent carried in recyclegas is absorbed by liquid absorption; Discharged by the air outlet (62) of the recyclegas after lyosoption from absorption tower (6) top, then sent into after heater (4) heats by circulating fan (3) and again send in dryer (1).
8. air current drying machine recyclegas washing absorption method as claimed in claim 7, it is characterized in that: air outlet (62) place at the top in absorption tower (6) is provided with gas-liquid separator (63), discharged from the air outlet (62) at absorption tower (6) top after gas-liquid separator (63) by the recyclegas after lyosoption.
9. air current drying machine recyclegas washing absorption method as claimed in claim 7, it is characterized in that: when being provided with absorbing liquid tank level control system, making absorbing liquid liquid level in absorption tower (6) by control system (102) in setting range by control and regulation valve (101).
10. the air current drying machine recyclegas washing absorption method as described in claim 7,8 or 9, is characterized in that: described solvent is inflammable, explosive and/or poisonous material; Described recyclegas is inert gas or nitrogen.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510209595.6A CN104771978B (en) | 2015-04-28 | 2015-04-28 | Circulating gas washing-absorbing system and washing-absorbing method for air current type drying machine |
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| CN201510209595.6A CN104771978B (en) | 2015-04-28 | 2015-04-28 | Circulating gas washing-absorbing system and washing-absorbing method for air current type drying machine |
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| CN104771978A true CN104771978A (en) | 2015-07-15 |
| CN104771978B CN104771978B (en) | 2017-01-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106152741A (en) * | 2016-06-30 | 2016-11-23 | 禹州市远大塑料电器有限责任公司 | Quartz stone drying device |
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| JPS54103673U (en) * | 1977-12-29 | 1979-07-21 | ||
| JPS54103673A (en) * | 1978-02-01 | 1979-08-15 | Nec Corp | Sealing method of semiconductor device |
| JPH08511335A (en) * | 1993-06-16 | 1996-11-26 | ヘンケル・コマンディットゲゼルシャフト・アウフ・アクチェン | Improved drying method using superheated steam in a drying medium and its use |
| CN203501706U (en) * | 2013-10-16 | 2014-03-26 | 四川省银河化学股份有限公司 | Belt type dryer |
| CN204582829U (en) * | 2015-04-28 | 2015-08-26 | 泸州北方化学工业有限公司 | Air current drying machine recyclegas washing absorption system |
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2015
- 2015-04-28 CN CN201510209595.6A patent/CN104771978B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54103673U (en) * | 1977-12-29 | 1979-07-21 | ||
| JPS54103673A (en) * | 1978-02-01 | 1979-08-15 | Nec Corp | Sealing method of semiconductor device |
| JPH08511335A (en) * | 1993-06-16 | 1996-11-26 | ヘンケル・コマンディットゲゼルシャフト・アウフ・アクチェン | Improved drying method using superheated steam in a drying medium and its use |
| CN203501706U (en) * | 2013-10-16 | 2014-03-26 | 四川省银河化学股份有限公司 | Belt type dryer |
| CN204582829U (en) * | 2015-04-28 | 2015-08-26 | 泸州北方化学工业有限公司 | Air current drying machine recyclegas washing absorption system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106152741A (en) * | 2016-06-30 | 2016-11-23 | 禹州市远大塑料电器有限责任公司 | Quartz stone drying device |
| CN106152741B (en) * | 2016-06-30 | 2019-05-10 | 禹州市远大塑料电器有限责任公司 | Quartz stone drying device |
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| CN104771978B (en) | 2017-01-25 |
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Effective date of registration: 20180803 Address after: 646605 Luzhou, Sichuan, Luzhou, North Korea high dam North cellulose Co., Ltd. Patentee after: Luzhou North cellulose Co., Ltd. Address before: 646603 Sichuan Luzhou high dam Luzhou North Chemical Industry Co., Ltd. Patentee before: Luzhou Beifang Chemical Industry Co., Ltd. |