CN103920630A - Organic coating nitrogen-charging oxygen-controlling closed circulation drying equipment and process - Google Patents
Organic coating nitrogen-charging oxygen-controlling closed circulation drying equipment and process Download PDFInfo
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Abstract
The invention discloses an organic coating nitrogen-charging oxygen-controlling closed circulation drying equipment and process. The equipment is used for drying an organic coating and comprises a drying tank, a safety detection system, an automatic control system, a pressure relief device, a circulation fan, a gas heating device, a nitrogen charging system, a vacuumizing system and a gas circulating loop, all components of the closed circulation drying equipment are hermetically connected, and nitrogen is recycled. Air in the drying tank is vacuumized and discharged before drying, oxygen concentration in the drying tank is controlled to be lower than minimum oxygen demand concentration by charging nitrogen, airflow in the drying tank is maintained to be in a micro-positive pressure state, a closed state or a full-circle state when the equipment runs, and combustible gas concentration in a system of the drying equipment is enabled to be no longer limited by the 4.3.2.2 rules of (GB14443-2007); when the equipment runs, high-temperature and high-concentration combustible gas contained the drying tank is not discharged, and mixed gas in the drying tank is vacuumized and discharged after drying is completed, so that improvement of safety, obvious energy-saving effect and big improvement of drying efficiency in the drying process of the organic coating are realized.
Description
Technical field
The present invention relates to the technical field of cyclic drying, particularly a kind of organic coating fills nitrogen control oxygen sealing and circulating drying equipment and technique.
Background technology
General drying equipment with hot-air circulation is feasible for dry Chinese medicine tablet, Packaging Bottle, melon and fruit dehydration etc. technically, because the fuel gas that material volatilizees in dry run seldom.But in having the dry materials process of fuel gas volatilization, in coating, leather, plastics, cloth and paper product dry run, because containing organic solvent in material, organic solvent volatilizees, discharges in dry run, caused oven dry tank combustable gas concentration to increase always, as long as the concentration of organic solvent has reached explosion ratio lower limit, Yin Gaowen, equipment ground loose contact cause that electrostatic accumulation or the explosion-proof defect of equipment produce spark, just may produce blast.For preventing in drying chamber the fuel gas accident of blasting, the know-why of existing drying equipment with hot-air circulation mainly comprises: control on the one hand every incendiary source, comprise that electrostatic grounding, equipment are explosion-proof, control baking temperature etc., on the other hand, by preventing that combustable gas concentration from reaching the explosion ratio limit.Major measure has: arrange special-purpose ventilating system with the concentration that guarantees any position fuel gas under any duty in drying chamber all lower than LEL.Safe ventilation comprises: supply with fresh air; Waste gas is drained into appropriate area; Organize rational air circulation air-flow etc.; Combustable gas concentration detection alarm device, electrical safety interlock and pressure relief facility are set simultaneously in drying plant.But said method amount of fuel gas in drying chamber reaches under the condition of certain concentration also may blast, and exists larger risk.Meanwhile, because hot blast is discharged in dry run, consume energy high; And the fresh air that needs heat make-up causes drying time long, and drying efficiency is low.
Summary of the invention
According to GB14443-2007 < < painting operation safety code coated and dried chamber safe practice regulation > >, drying chamber need to arrange air circulation system according to technique, and its air-flow is arranged to meet simultaneously and made indoor fuel gas not produce the requirement of gathering.The safe ventilation system of drying chamber should be used air flow ventilating in a organized way, and with the concentration that guarantees volatile solvent in drying chamber or suspended powder, lower than LEL, and in drying chamber, the highest volumetric concentration of fuel gas should not surpass 25% of LEL value.
Existing drying equipment with hot-air circulation is owing to the high-temperature gas that contains fuel gas need to being drained, supply with a large amount of fresh airs simultaneously, on the one hand because of heating fresh air, to lead the coated and dried time also longer, drying efficiency reduces, on the other hand, because the high-temperature gases that contain fuel gas a large amount of in dry run are drained, cause energy loss or newly-increased UTILIZATION OF VESIDUAL HEAT IN facility to cause that investment is excessive.
Poor in order to overcome existing drying equipment with hot-air circulation energy-saving effect, security performance is low, patent of the present invention provides a kind of Novel heated air circulation drying equipment, by controlling or reducing the oxygen concentration in drying chamber, even if reaching the explosion ratio limit, the interior combustable gas concentration of drying equipment system can not explode.
Of the present invention separately have object to be, a kind of drying process of above-mentioned drying equipment is provided.
In order to reach above-mentioned the first object, the present invention by the following technical solutions:
Organic coating fills a nitrogen control oxygen sealing and circulating drying equipment, described in fill nitrogen control oxygen sealing and circulating drying equipment in order to dry organic coating; Drying equipment comprises: drying chamber, safety detecting system, automatic control system, pressure relief device, circulating fan, gas-heating apparatus, Nitrogen filling system, pumped vacuum systems, gas circulation loop; The airtight connection of each part of described sealing and circulating drying equipment, nitrogen circulation is used;
Described drying chamber bottom is provided with disk, and pore is evenly set on disk, and hot blast is through the article surface coating that is dried of the dry disk of pore top;
The described article that are dried are first placed on drying chamber disk before dry, and the article surface coating that is dried is by the heated-air drying of 140-160 ℃;
Described gas-heating apparatus heated nitrogen is to 140-160 ℃, and drying chamber is sent nitrogen in wind drive unit;
The described article that are dried, dry complete, are first opened drying chamber cover, from described drying chamber top, take out.
Preferably, nitrogen air inlet pipeline is set at the bottom of drying chamber, 2 nitrogen blanketing valve roads of nitrogen air inlet pipeline access, nitrogen blanketing valve road is being filled fast nitrogen and is emergently using while filling nitrogen, and another is micro-nitrogen blanketing valve road, in safeguards system, uses during in slight positive pressure state.
Preferably, described drying chamber pressure release area is according to cubic meter volume 0.05～0.22m
2design, pressure relief device is towards not operation region.
Preferably, described drying chamber internal electric wire arranges temperature-resistant insulation layer, and drying chamber external electrical link arranges protective cover; Dry tank metal shell protective grounding and guarantee that earth resistance is less than 10 Ω, drying chamber electrostatic protection earth resistance is less than 100 Ω, between electric heater and metallic support, electric insulation is set, insulaion resistance >=1M Ω.
Preferably, drying chamber tank deck installing double-exhaust pipeline, a gas exhaust piping installing weight valve, when the equipment internal pressure releasing pressure automatically that exceeds standard, installs air bleeding valve on another gas exhaust piping, and the check-valves that prevents gas backstreaming is installed on total air escape pipe road.
Preferably, safety detecting system comprises thermometer, Pressure gauge and oxymeter, and described thermometer detects gas temperature in real time, and described Pressure gauge detects gas pressure in drying chamber in real time, and described oxymeter detects oxygen concentration in drying chamber.
In order to reach above-mentioned the second object, the present invention by the following technical solutions:
Organic coating fills a drying process for nitrogen control oxygen sealing and circulating drying equipment, comprises the steps:
Step 1, put into workpiece to be dried, close cover, closed system;
After step 2, drying chamber vacuumize, open nitrogen fill valve door;
In step 3, drying chamber, when atmospheric pressure state, close nitrogen fill valve door, open micro-nitrogen fill valve door keeping system slight positive pressure state;
Step 4, guarantee that oxygen concentration is lower than 5%, start circulating fan;
Step 5, startup electric heater, dry operation;
Step 6, dried after, close electric heater, make equipment cooling;
Step 7, close circulating fan;
Step 8, close nitrogen fill valve door, drying chamber vacuumizes;
Step 9, determine that combustable gas concentration is lower than explosion ratio lower limit;
Step 10, open cover, take out the workpiece after drying.
Preferably, by the oxygen concentration in control drying chamber, lower than the aerobic concentration of minimum, in dry run, contain the outer row of fuel gas of high temperature, high concentration.
Preferably, when automatic control system should guarantee to start shooting, first vacuumize, restart nitrogen circulation blower fan, then start heating system; During shutdown, first close heating system, drying chamber vacuumizes again; By oxygen concentration with fill nitrogen control system, gas extraction system is carried out safety interlocking, when oxygen concentration is higher than when setting value, open automatically on nitrogen blanketing valve road, is filled with nitrogen, the automatic discharge section gas of gas extraction system, until oxygen concentration is lower than limit value.
Preferably, after putting into workpiece, should first to whole device interior environment, carry out nitrogen replacement, after oxygen concentration is lower than safety standard, open again heating system and dry operation; Drying chamber top, bottom, middle part install some oxymeters for real-time watch device in oxygen concentration, oxygen concentration safety limit is volumetric concentration 5%, oxymeter should be interlocked with automatic control, monitoring alarm; Be dried as sealing and circulating state, can not have outside air to enter.
The present invention has following advantage and effect with respect to prior art:
1, compare the drying process of the exhaust of traditional limit, the supplementary fresh air in limit, the present invention is by vacuum pumping technology venting air, be filled with nitrogen, during operation, drying chamber includes the not outer row of fuel gas of high temperature, high concentration, and environmental protection need to be processed the amount of volatile organic compounds and dwindle greatly.
2, because supplementing the amount of nitrogen reduces, the nitrogen heat time dwindles, and therefore, under equal dry mass condition, is dried required time decreased, and drying efficiency improves, and greatly improves energy-saving effect.
3, in drying equipment system, combustable gas concentration is no longer limited to (GB14443-2007) 4.3.2.2 regulation, in the circulatory system, be filled with nitrogen, by controlling oxygen concentration in drying chamber lower than the aerobic concentration of minimum, even combustable gas concentration reaches the explosion ratio limit in drying chamber, meet incendiary source and also can not blast.
Accompanying drawing explanation
Fig. 1 is that the present invention fills nitrogen control oxygen drying equipment with hot-air circulation schematic diagram;
Fig. 2 is that the present invention fills nitrogen control oxygen heat-wind circulate drying process chart.
Description of reference numerals: 1, oxymeter; 2, Pressure gauge; 3, minimum pressure valve; 4, safety flare; 5, thermometer; 6, pressure relief device; 7, circulating fan; 8, electric heater; 9, pressure-reducing valve; 10, nitrogen fill valve; 11, micro-nitrogen fill valve; 12, check-valves.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
As shown in Figure 1, the organic coating of the present embodiment fills nitrogen control oxygen sealing and circulating drying equipment, in order to dry organic coating; The described nitrogen control oxygen sealing and circulating drying equipment that fills comprises: drying chamber, safety detecting system, automatic control system, pressure relief device 6, circulating fan 7, gas-heating apparatus, Nitrogen filling system, pumped vacuum systems, gas circulation loop; The airtight connection of each part of described sealing and circulating drying equipment, nitrogen circulation is used; Described drying chamber bottom is provided with disk, and pore is evenly set on disk, and hot blast is through the surface coating that is dried of the dry disk of pore top; The described article that are dried are first placed on drying chamber disk before dry, and the article surface coating that is dried is by the heated-air drying of 140-160 ℃; Described gas-heating apparatus heated nitrogen is to 140-160 ℃, and drying chamber is sent nitrogen in wind drive unit; The described article that are dried, dry complete, are first opened drying chamber cover, from described drying chamber top, take out.
Nitrogen air inlet pipeline is set at the bottom of drying chamber, 2 nitrogen blanketing valve roads of nitrogen air inlet pipeline access, nitrogen blanketing valve road is being filled fast nitrogen and is emergently using while filling nitrogen, and another is micro-nitrogen blanketing valve road, in safeguards system, uses during in slight positive pressure state.
Described drying chamber pressure release area is according to cubic meter volume 0.05～0.22m
2design, pressure relief device is towards not operation region.
Described drying chamber internal electric wire arranges temperature-resistant insulation layer, and drying chamber external electrical link arranges protective cover.Dry tank metal shell protective grounding and guarantee that earth resistance is less than 10 Ω, drying chamber electrostatic protection earth resistance is less than 100 Ω, between electric heater 8 and metallic support, electric insulation is set, insulaion resistance >=1M Ω.
Drying chamber tank deck installing double-exhaust pipeline, a gas exhaust piping installing weight valve, when the equipment internal pressure releasing pressure automatically that exceeds standard, installs air bleeding valve on another gas exhaust piping, and the check-valves 12 that prevents gas backstreaming is installed on total air escape pipe road.The top of described drying chamber is also provided with safety flare 4.On the output loop of drying chamber, be also provided with a minimum pressure valve 3.
Safety detecting system comprises thermometer 5, Pressure gauge 2 and oxymeter 1, and described thermometer detects gas temperature in real time, and described Pressure gauge detects gas pressure in drying chamber in real time, and described oxymeter detects oxygen concentration in drying chamber.
In the embodiment shown in fig. 1, drying equipment with hot-air circulation is usingd nitrogen and is replaced air to dry as circulatory mediator, and back tender is as poly-the third vinyl coating in motor winding surface.After putting into workpiece, should first to whole device interior environment, carry out nitrogen replacement, after oxygen concentration is lower than security limitations, open again electric heater 8 and dry operation.Pass into the nitrogen of displaced air and maintenance slight positive pressure state, establish two branch roads, charge valve and micro-charge valve are installed respectively, and install pressure-reducing valve 9 for cushioning nitrogen pressure at the total inlet end of nitrogen.Because oxygen concentration in equipment in whole dry run needs strict control, therefore the inside such as equipment, pipeline should install some oxymeters for real-time watch device in oxygen concentration, oxymeter should be interlocked with automatic control, monitoring alarm.
After putting into workpiece to be dried, first whole system is carried out to nitrogen replacement, close micro-nitrogen fill valve 11 shown in figure, open pressure-reducing valve 9, nitrogen fill valve 10 and air exhauster and drain tap, equipment is filled to nitrogen exhaust, and oxymeter 1 reads the real-time numerical value of oxygen concentration from figure.When the reading of oxymeter 1 reaches after work oxygen concentration (this concentration need lower than oxygen concentration limit value), close nitrogen fill valve 10, air exhauster and drain tap, open micro-nitrogen fill valve 11 and circulating fan 7, maintenance is filled with trace nitrogen gas to system and maintains system pressure-fired recurrent state, when oxygen concentration is during lower than the aerobic concentration of minimum, can open electric heater 8 and start to dry operation.
As shown in Figure 2, organic coating fills the drying process of nitrogen control oxygen sealing and circulating drying equipment, comprises the steps:
Step 1, put into workpiece to be dried, close cover, closed system;
After step 2, drying chamber vacuumize, open nitrogen fill valve door;
In step 3, drying chamber, when atmospheric pressure state, close nitrogen fill valve door, open micro-nitrogen fill valve door keeping system slight positive pressure state;
Step 4, guarantee that oxygen concentration is lower than 5%, start circulating fan;
Step 5, startup electric heater, dry operation;
Step 6, dried after, close electric heater, make equipment cooling;
Step 7, close circulating fan;
Step 8, close nitrogen fill valve door, drying chamber vacuumizes;
Step 9, determine that combustable gas concentration is lower than explosion ratio lower limit;
Step 10, open cover, take out the workpiece after drying.
In this technique, by the oxygen concentration in control drying chamber, lower than the aerobic concentration of minimum, in dry run, contain the outer row of fuel gas of high temperature, high concentration.
When automatic control system should guarantee to start shooting, first vacuumize, restart nitrogen circulation blower fan, then start heating system; During shutdown, first close heating system, drying chamber vacuumizes again; By oxygen concentration with fill nitrogen control system, gas extraction system is carried out safety interlocking, when oxygen concentration is higher than when setting value, open automatically on nitrogen blanketing valve road, is filled with nitrogen, the automatic discharge section gas of gas extraction system, until oxygen concentration is lower than limit value.
After putting into workpiece, should first to whole device interior environment, carry out nitrogen replacement, after oxygen concentration is lower than safety standard, open again heating system and dry operation; Drying chamber top, bottom, middle part install some oxymeters for real-time watch device in oxygen concentration, oxygen concentration safety limit is volumetric concentration 5%, oxymeter should be interlocked with automatic control, monitoring alarm; Be dried as sealing and circulating state, can not have outside air to enter.
In this technical process, the sealing and circulating drying equipment dry run needs 10-12 hour that meets GB14443-2007 < < painting operation safety code coated and dried chamber safe practice regulation > >, power consumption is about 8.7 kilowatt hours/platform, by the improved nitrogen control oxygen sealing and circulating drying equipment that fills, complete that dry only to need 3-4 hour, power consumption be 3.1 kilowatt hours/platform.Fill nitrogen control oxygen sealing and circulating drying equipment security raising, energy consumption greatly reduces, production efficiency greatly improves, and produces a desired effect.
Above-described embodiment is preferably embodiment of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present invention and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.
Claims (10)
1. organic coating fills a nitrogen control oxygen sealing and circulating drying equipment, it is characterized in that, described in fill nitrogen control oxygen sealing and circulating drying equipment in order to dry organic coating;
The described nitrogen control oxygen sealing and circulating drying equipment that fills comprises: drying chamber, safety detecting system, automatic control system, pressure relief device, circulating fan, gas-heating apparatus, Nitrogen filling system, pumped vacuum systems, gas circulation loop; The airtight connection of each part of described sealing and circulating drying equipment, nitrogen circulation is used;
Described drying chamber bottom is provided with disk, and pore is evenly set on disk, and hot blast is through the article surface coating that is dried of the dry disk of pore top;
The described article that are dried are first placed on drying chamber disk before dry, and the article surface coating that is dried is by the heated-air drying of 140-160 ℃;
Described gas-heating apparatus heated nitrogen is to 140-160 ℃, and drying chamber is sent nitrogen in wind drive unit;
The described article that are dried, dry complete, are opened drying chamber cover, from described drying chamber top, take out.
2. a kind of organic coating according to claim 1 fills nitrogen control oxygen sealing and circulating drying equipment, it is characterized in that, nitrogen air inlet pipeline is set at the bottom of drying chamber, 2 nitrogen blanketing valve roads of nitrogen air inlet pipeline access, nitrogen blanketing valve road is being filled fast nitrogen and is emergently using while filling nitrogen, another is micro-nitrogen blanketing valve road, in safeguards system, uses during in slight positive pressure state.
3. a kind of organic coating according to claim 1 fills nitrogen control oxygen sealing and circulating drying equipment, it is characterized in that, described drying chamber pressure release area is according to cubic meter volume 0.05～0.22m
2design, pressure relief device is towards not operation region.
4. a kind of organic coating according to claim 1 fills nitrogen control oxygen sealing and circulating drying equipment, it is characterized in that, described drying chamber internal electric wire arranges temperature-resistant insulation layer, and drying chamber external electrical link arranges protective cover; Dry tank metal shell protective grounding and guarantee that earth resistance is less than 10 Ω, drying chamber electrostatic protection earth resistance is less than 100 Ω, between electric heater and metallic support, electric insulation is set, insulaion resistance >=1M Ω.
5. a kind of organic coating according to claim 1 fills nitrogen control oxygen sealing and circulating drying equipment, it is characterized in that, drying chamber tank deck installing double-exhaust pipeline, a gas exhaust piping installing weight valve, when the equipment internal pressure releasing pressure automatically that exceeds standard, on another gas exhaust piping, install air bleeding valve, the check-valves that prevents gas backstreaming is installed on total air escape pipe road.
6. a kind of organic coating according to claim 1 fills nitrogen control oxygen sealing and circulating drying equipment, it is characterized in that, safety detecting system comprises thermometer, Pressure gauge and oxymeter, described thermometer detects gas temperature in real time, described Pressure gauge detects gas pressure in drying chamber in real time, and described oxymeter detects oxygen concentration in drying chamber.
7. based on power, require in 1-6 organic coating described in any one to fill a drying process for nitrogen control oxygen sealing and circulating drying equipment, it is characterized in that, comprise the steps:
Step 1, put into workpiece to be dried, close cover, closed system;
After step 2, drying chamber vacuumize, open nitrogen fill valve door;
In step 3, drying chamber, when atmospheric pressure state, close nitrogen fill valve door, open micro-nitrogen fill valve door keeping system slight positive pressure state;
Step 4, guarantee that oxygen concentration is lower than 5%, start circulating fan;
Step 5, startup electric heater, dry operation;
Step 6, dried after, close electric heater, make equipment cooling;
Step 7, close circulating fan;
Step 8, close nitrogen fill valve door, drying chamber vacuumizes;
Step 9, determine that combustable gas concentration is lower than explosion ratio lower limit;
Step 10, open cover, take out the workpiece after drying.
8. a kind of organic coating according to claim 7 fills the drying process of nitrogen control oxygen sealing and circulating drying equipment, it is characterized in that, by the oxygen concentration in control drying chamber, lower than the aerobic concentration of minimum, in dry run, contain the outer row of fuel gas of high temperature, high concentration.
9. a kind of organic coating according to claim 7 fills the drying process of nitrogen control oxygen sealing and circulating drying equipment, it is characterized in that, when automatic control system should guarantee to start shooting, first vacuumizes, and restarts nitrogen circulation blower fan, then starts heating system; During shutdown, first close heating system, drying chamber vacuumizes again; By oxygen concentration with fill nitrogen control system, gas extraction system is carried out safety interlocking, when oxygen concentration is higher than when setting value, open automatically on nitrogen blanketing valve road, is filled with nitrogen, the automatic discharge section gas of gas extraction system, until oxygen concentration is lower than limit value.
10. a kind of organic coating according to claim 7 fills the drying process of nitrogen control oxygen sealing and circulating drying equipment, it is characterized in that, after putting into workpiece, should before drying chamber is dry, vacuumize air in venting drying chamber; In dry run, no matter how nitrogen temperature changes in drying chamber, drying chamber internal pressure is all the time in slight positive pressure state; Dry complete drying chamber vacuumizes mist in venting drying chamber again.Drying chamber top, bottom, middle part install some oxymeters for real-time watch device in oxygen concentration, oxygen concentration safety limit is volumetric concentration 5%, oxymeter should be interlocked with automatic control, monitoring alarm; Dry run is sealing and circulating state, can not have outside air to enter.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108844354A (en) * | 2018-08-01 | 2018-11-20 | 广东新会美达锦纶股份有限公司 | A kind of drying device of nylon 6 slice |
| CN109612227A (en) * | 2019-01-24 | 2019-04-12 | 沈阳工程学院 | A kind of rapid drying device of gallium oxide powder |
| CN111288753A (en) * | 2018-12-07 | 2020-06-16 | 江西光明智能科技有限公司 | Drying apparatus |
| CN111421663A (en) * | 2020-04-01 | 2020-07-17 | 维苏威高级陶瓷(中国)有限公司 | Mixing process of refractory material for continuous casting |
| CN113198702A (en) * | 2021-05-10 | 2021-08-03 | 中国科学院上海天文台 | High molecular coating sintering device suitable for inner wall of micro container |
| CN114177858A (en) * | 2021-12-13 | 2022-03-15 | 清氢(北京)科技有限公司 | Large-scale preparation method and large-scale preparation device of electrocatalyst |
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| CN114177858A (en) * | 2021-12-13 | 2022-03-15 | 清氢(北京)科技有限公司 | Large-scale preparation method and large-scale preparation device of electrocatalyst |
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| CN103920630B (en) | 2016-09-21 |
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