JPH067588A - Safe operation control method for dry cleaning apparatus using combustible solvent - Google Patents
Safe operation control method for dry cleaning apparatus using combustible solventInfo
- Publication number
- JPH067588A JPH067588A JP4169273A JP16927392A JPH067588A JP H067588 A JPH067588 A JP H067588A JP 4169273 A JP4169273 A JP 4169273A JP 16927392 A JP16927392 A JP 16927392A JP H067588 A JPH067588 A JP H067588A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- nitrogen gas
- drying system
- washing
- cleaning
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005108 dry cleaning Methods 0.000 title claims abstract description 16
- 239000002904 solvent Substances 0.000 title claims description 15
- 238000000034 method Methods 0.000 title claims description 11
- 238000001035 drying Methods 0.000 claims abstract description 55
- 238000005406 washing Methods 0.000 claims abstract description 15
- 238000004140 cleaning Methods 0.000 claims description 45
- 238000004821 distillation Methods 0.000 claims description 27
- 239000011261 inert gas Substances 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 41
- 229910001873 dinitrogen Inorganic materials 0.000 abstract description 39
- 230000006837 decompression Effects 0.000 abstract description 10
- 238000001514 detection method Methods 0.000 abstract description 6
- 238000012856 packing Methods 0.000 abstract description 3
- 238000004880 explosion Methods 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Accessory Of Washing/Drying Machine, Commercial Washing/Drying Machine, Other Washing/Drying Machine (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ドライクリーニング機
の洗浄・乾燥系内に不活性ガスを投入して、可燃性溶剤
使用による爆発の危険をなくしたドライクリーニング装
置の安全運転制御方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safe operation control method for a dry cleaning apparatus in which an inert gas is introduced into the cleaning / drying system of a dry cleaning machine to eliminate the risk of explosion caused by the use of a flammable solvent.
【０００２】[0002]
【従来の技術】ドライクリーニングにおいては、公害防
止のために石油系溶剤を使用することが検討されている
が、石油系溶剤は引火点が約４１℃と低く、洗浄・乾燥
工程、特に乾燥工程において衣服類が乾燥されていくに
つれて衣服類の温度が上昇すると共に溶剤ガスの濃度が
薄くなって引火しやすくなり、静電気による火花や、金
属が衣服類と一緒に内胴中に入った場合に内胴と金属と
が当ることによって発生する火花によって、溶剤ガスに
引火して爆発するおそれがある。2. Description of the Related Art In dry cleaning, it is considered to use petroleum-based solvents to prevent pollution. However, petroleum-based solvents have a low flash point of about 41 ° C. In the case of clothes becoming dry, the temperature of the clothes rises and the concentration of solvent gas decreases, making it easier to catch fire, and when sparks due to static electricity or metal get inside the inner body together with the clothes. Sparks generated by the collision of the inner body with the metal may cause the solvent gas to ignite and explode.
【０００３】前記のような爆発の危険を防止するため、
ドライクリーニング機の洗浄・乾燥系内を減圧し、窒素
ガスを投入して洗浄および乾燥工程を行なうことが提案
されている（特開平３−１２６４８９号参照）。また、
石油系溶剤は、加熱によって蒸発する留出温度が１５５
℃から１９４℃くらいまでの広い留出温度範囲の物質が
含まれているので、蒸留器の加熱温度を１４５℃〜１５
０℃に設定すると共に蒸留系をバキュームポンプにより
減圧し、その減圧度を調整することにより初留出点から
終留出点に至るまでの蒸留を行なうことが知られている
（特開平４−１２２４０１号参照）。In order to prevent the above danger of explosion,
It has been proposed to reduce the pressure in the cleaning / drying system of a dry cleaning machine and introduce nitrogen gas to perform the cleaning and drying steps (see Japanese Patent Laid-Open No. 3-126489). Also,
Petroleum solvents have a distillation temperature of 155 which evaporates when heated.
Since a substance having a wide range of distillation temperature from ℃ to 194 ℃ is included, the heating temperature of the distiller should be 145 ℃ to 15 ℃.
It is known that distillation is performed from the initial distillation point to the final distillation point by setting the temperature to 0 ° C., depressurizing the distillation system with a vacuum pump, and adjusting the degree of depressurization (Japanese Patent Application Laid-Open No. Hei 4- 122401).
【０００４】[0004]
【発明が解決しようとする課題】前記洗浄・乾燥内の減
圧は、通常−５５０ｍｍＨｇ程度であって、窒素ガス投
入によりほぼ大気圧として洗浄・乾燥工程を行なうもの
であるが、その洗浄・乾燥工程の途中から蒸留系内を減
圧（例えば−５５０〜−５７０ｍｍＨｇ）して蒸留工程
を行ない、工程によっては洗浄・乾燥系内と蒸留系内と
を均圧化させる必要があるので、洗浄・乾燥系内が減圧
される場合が生ずる。そして、このようにして洗浄・乾
燥系内が減圧された状態のまま洗浄・乾燥工程が行なわ
れると、パッキングの不良や締付けが不十分な場合に外
気が洗浄・乾燥系内に流入して酸素濃度が上昇し、安全
を保つことができなくなるおそれがある。The depressurization in the washing / drying is usually about -550 mmHg, and the washing / drying step is performed by introducing nitrogen gas at almost atmospheric pressure. In the middle of the process, the distillation system is depressurized (for example, -550 to -570 mmHg) to carry out the distillation step. Depending on the step, it is necessary to equalize the pressure in the cleaning / drying system and the distillation system. The inside may be depressurized. If the cleaning / drying process is performed while the internal pressure of the cleaning / drying system is reduced in this way, outside air will flow into the cleaning / drying system when the packing is defective or the tightening is insufficient. There is a risk that the concentration will increase and it will become impossible to maintain safety.
【０００５】本発明は、前記の如き従来技術の問題点を
改善し、常に安全な運転を行なうことができる可燃性溶
剤使用のドライクリーニング装置における安全運転制御
方法を提供することを目的とする。An object of the present invention is to provide a safe operation control method in a dry cleaning apparatus using a flammable solvent, which can solve the above-mentioned problems of the prior art and can always perform safe operation.
【０００６】[0006]
【課題を解決するための手段】本発明は、前記の如き目
的を達成するため、洗浄・乾燥系内を減圧した後不活性
ガスを投入してマイコン制御により洗浄および乾燥工程
を行ない、洗浄工程により汚れた溶剤を蒸留系に移送
し、その蒸留系内を減圧しながら溶剤を蒸留すべくなし
た可燃性溶剤使用のドライクリーニング装置において、
プログラムに設定したマイコン制御を開始すると、洗浄
・乾燥系内の圧力を常に検出し、その検出圧力が最初の
不活性ガス投入時よりはるかに弱いある設定減圧度以上
の減圧度であることを検出すると、洗浄・乾燥系内に不
活性ガスを投入してほぼ大気圧と等しい圧力を維持させ
ることを特徴とする。In order to achieve the above-mentioned object, the present invention performs a cleaning and drying process by microcomputer control by depressurizing the cleaning / drying system and then introducing an inert gas. In a dry cleaning device using a flammable solvent, which is designed to transfer the dirty solvent to a distillation system and distill the solvent while depressurizing the distillation system,
When the microcomputer control set in the program is started, the pressure inside the cleaning / drying system is constantly detected, and the detected pressure is much weaker than when the first inert gas was introduced Then, an inert gas is introduced into the cleaning / drying system to maintain a pressure substantially equal to the atmospheric pressure.
【０００７】[0007]
【作用】本発明は、前記の如く、プログラムに設定した
マイコン制御を開始すると、洗浄・乾燥系内の圧力を常
に検出し、その検出圧力が最初の不活性ガス投入時より
はるかに弱いある設定減圧度以上、例えば設定減圧度を
−５０ｍｍＨｇとし、系内がそれ以上の減圧度例えば−
１００ｍｍＨｇであることを検出すると、系内がほぼ大
気圧になるまで不活性ガスを系内に投入するので、外気
が系内に流入するおそれが全くなくなるばかりでなく、
新たに投入した不活性ガスにより酸素濃度がより薄くな
るので、爆発の危険がない安全な運転を行なうことがで
きる。As described above, according to the present invention, when the microcomputer control set in the program is started, the pressure in the cleaning / drying system is constantly detected, and the detected pressure is much weaker than that when the first inert gas is introduced. Decompression degree or more, for example, the set decompression degree is -50 mmHg, and the inside of the system has a decompression degree higher than that,
When it is detected that the pressure is 100 mmHg, the inert gas is fed into the system until the pressure in the system becomes almost atmospheric pressure. Therefore, not only is there no possibility that the outside air will flow into the system,
Since the oxygen concentration becomes thinner due to the newly introduced inert gas, safe operation without danger of explosion can be performed.
【０００８】[0008]
【実施例】図２は本発明を適用したドライクリーニング
装置の構成を示すブロック図である。FIG. 2 is a block diagram showing the construction of a dry cleaning apparatus to which the present invention is applied.
【０００９】図２において、１はドライクリーニング機
の洗浄・乾燥系、２は同じく蒸留系であって、両者は図
に示す如く多数の管路により接続されている。なお、図
２は、図示の都合上洗浄・乾燥系１と蒸留系２とが分離
されているが、実際には一体的に組み込まれて１つのド
ライクリーニング装置が構成されている。In FIG. 2, reference numeral 1 is a cleaning / drying system of a dry cleaning machine, and 2 is a distillation system, both of which are connected by a number of pipe lines as shown in the figure. Although the cleaning / drying system 1 and the distillation system 2 are separated from each other for convenience of illustration in FIG. 2, they are actually integrated into one dry cleaning device.
【００１０】そして、このドライクリーニング装置は、
洗浄・乾燥系１を窒素ガス投入弁３を有する管路を介し
て窒素ガスタンク４に接続し、かつ、その窒素ガスタン
ク４は管路を介して空気中から窒素をとり込む窒素ガス
発生装置５と接続されており、窒素ガス発生装置５によ
りとり込んだ窒素ガスを窒素ガスタンク４に貯留圧５ｋ
ｇ／ｃｍ2で貯留し、窒素ガスタンク４から洗浄・乾燥
系１に窒素ガスを投入して貯留圧が低下すると、窒素ガ
ス発生装置５が作動して再び５ｋｇ／ｃｍ2の貯留圧を
保つように構成されている。そして、洗浄工程に入るス
タートスイッチをオンすると、後述のようにして、洗浄
・乾燥系１内を減圧し、その減圧度が設定圧例えば−５
５０ｍｍＨｇになったことを窒素ガス投入制御用圧力検
出手段６が検出すると、マイコン制御部７を介し窒素ガ
ス投入弁３を開いて洗浄・乾燥系１内に窒素ガスを投入
し、これにより洗浄・乾燥系１内が大気圧（０ｍｍＨ
ｇ）になったことを圧力検出手段６が検出すると窒素ガ
ス投入弁３を閉じ、ここからマイコン制御部に設定され
たプログラムに従う洗浄工程に入るように構成されてい
る。This dry cleaning device is
The cleaning / drying system 1 is connected to a nitrogen gas tank 4 via a pipe having a nitrogen gas input valve 3, and the nitrogen gas tank 4 is connected to a nitrogen gas generator 5 for taking in nitrogen from the air through the pipe. It is connected to the nitrogen gas tank 4 and stores the nitrogen gas taken in by the nitrogen gas generator 5 at a storage pressure of 5 k.
g / cm 2 is stored, and when nitrogen gas is fed from the nitrogen gas tank 4 to the cleaning / drying system 1 to lower the storage pressure, the nitrogen gas generator 5 is activated to maintain the storage pressure of 5 kg / cm 2 again. Is configured. Then, when the start switch for entering the cleaning step is turned on, the inside of the cleaning / drying system 1 is depressurized, and the degree of depressurization is set to, for example, -5 as described below.
When the pressure detection means 6 for nitrogen gas charging control detects that the pressure has reached 50 mmHg, the nitrogen gas charging valve 3 is opened via the microcomputer control unit 7 and nitrogen gas is charged into the cleaning / drying system 1, whereby cleaning / drying is performed. Atmospheric pressure in the drying system 1 (0 mmH
When the pressure detecting means 6 detects that the condition g) has been reached, the nitrogen gas charging valve 3 is closed and the cleaning process according to the program set in the microcomputer controller is started from here.
【００１１】また、前記洗浄・乾燥系１に接続した洗浄
・乾燥系用の電磁開閉バキューム弁８を有する管路と蒸
留系２に接続した蒸留系用の電磁開閉バキューム弁９，
９′を有する管路とを接続し、かつ、その接続点を１台
のバキュームポンプ１０に接続し、常態においては該バ
キュームポンプ１０を連続的に運転し、蒸留系用の電磁
開閉バキューム弁９，９′を閉じると共に洗浄系用の電
磁開閉バキューム弁８を開くと洗浄・乾燥系１内を減圧
し、逆に、洗浄・乾燥系用の電磁開閉バキューム弁８を
閉じると共に蒸留系用の電磁開閉バキューム弁９，９′
を開くと蒸留系２内を減圧し得るように構成されてい
る。なお、この実施例において、蒸留系用の電磁開閉バ
キューム弁が２個併設されているのは、その一方が先に
示した特開平４−１２２４０１号公報に開示されている
大流量排気管路用、他方が小流量排気管路用のものであ
る。Further, a pipe line having a cleaning / drying system electromagnetic opening / closing vacuum valve 8 connected to the cleaning / drying system 1 and a distillation system electromagnetic opening / closing vacuum valve 9 connected to the distillation system 2,
9'and the connection point is connected to one vacuum pump 10, and in the normal state, the vacuum pump 10 is continuously operated, and an electromagnetic opening / closing vacuum valve 9 for the distillation system is connected. , 9'and the electromagnetic opening / closing vacuum valve 8 for the cleaning system are opened to reduce the pressure in the cleaning / drying system 1, and conversely, the electromagnetic opening / closing vacuum valve 8 for the cleaning / drying system is closed and the electromagnetic valve for the distillation system is closed. Open / close vacuum valve 9, 9 '
The inside of the distillation system 2 can be depressurized by opening. In this embodiment, the two electromagnetic opening / closing vacuum valves for the distillation system are provided side by side for the large-flow exhaust pipe line, one of which is disclosed in Japanese Patent Laid-Open No. 4-122401. The other is for a small flow rate exhaust pipe line.
【００１２】また、この実施例において、１１は洗浄・
乾燥系内の減圧度を制御する圧力検出手段であって、前
記の如く、蒸留系のバキューム弁９，９′を閉じると共
に洗浄・乾燥系のバキューム弁８を開いて洗浄・乾燥系
内を減圧し、その減圧度が設定値例えば−５５０ｍｍＨ
ｇに達したことを圧力検出手段１１が検出すると、マイ
コン制御部７を介してバキューム弁８を閉じるように構
成されている。In this embodiment, 11 is a cleaning /
A pressure detecting means for controlling the degree of decompression in the drying system. As described above, the vacuum valves 9 and 9'of the distillation system are closed and the vacuum valve 8 of the cleaning / drying system is opened to reduce the pressure in the cleaning / drying system. However, the degree of pressure reduction is a set value, for example, −550 mmH.
When the pressure detector 11 detects that the pressure g has been reached, the vacuum valve 8 is closed via the microcomputer controller 7.
【００１３】さらに、この実施例においては、洗浄・乾
燥系１と蒸留系２とをバランス弁１２を有する管路１３
によって接続している。すなわち、バランス弁１２は、
通常は閉じていて、洗浄・乾燥系１内と蒸留系２内の圧
力は別個になっているが、ある工程から次の工程に移行
する際など、洗浄・乾燥系１と蒸留系２とを均圧化させ
る必要がある場合にバランス弁１２を開くものである。Further, in this embodiment, the washing / drying system 1 and the distillation system 2 are provided with a pipe line 13 having a balance valve 12.
Connected by. That is, the balance valve 12 is
Normally, it is closed, and the pressure in the cleaning / drying system 1 and the pressure in the distillation system 2 are separate. However, when moving from one process to the next, the cleaning / drying system 1 and the distillation system 2 are separated. The balance valve 12 is opened when it is necessary to equalize the pressure.
【００１４】前記の窒素ガス投入制御用応力検出手段６
は、マイコン制御部７に設定されたプログラムに従う洗
浄工程に入る前は、前記の如く例えば−５５０ｍｍＨｇ
になったことを検出すると窒素ガス投入弁３を開いて洗
浄・乾燥系内に窒素ガスを供給するように構成されてい
るが、マイコン制御部７に設定されたプログラムに従う
洗浄工程および乾燥工程に入ると、図１に示すように、
洗浄・乾燥内の圧力を常に検出し、その検出圧が、最初
の窒素ガス投入時よりはるかに弱いある設定減圧度、例
えば−５０ｍｍＨｇ以上の減圧度（例えば−１００ｍｍ
Ｈｇ）であることを検出すると、窒素ガス投入弁３を開
いて洗浄・乾燥系内がほぼ大気圧に達するまで窒素ガス
を供給するように構成されている。The stress detecting means 6 for controlling the nitrogen gas injection described above.
Before entering the cleaning process according to the program set in the microcomputer control unit 7, as described above, for example, −550 mmHg
When it is detected that the nitrogen gas input valve 3 is opened to supply the nitrogen gas into the cleaning / drying system, the cleaning process and the drying process according to the program set in the microcomputer control unit 7 are performed. When you enter, as shown in Figure 1,
The pressure inside the cleaning / drying is always detected, and the detected pressure is much weaker than when the first nitrogen gas was introduced. For example, a set decompression degree of -50 mmHg or more (e.g. -100 mm).
Hg) is detected, the nitrogen gas charging valve 3 is opened to supply the nitrogen gas until the inside of the cleaning / drying system reaches almost atmospheric pressure.
【００１５】[0015]
【発明の効果】本発明は、前記の如く、マイコン制御部
に設定されたプログラムに従う洗浄工程および乾燥工程
に入ると、窒素ガス投入制御用圧力検出手段６により洗
浄・乾燥系内の圧力を常に検出し、その検出圧が最初の
窒素ガス投入時よりはるかに弱い減圧度例えば−５０ｍ
ｍＨｇ以上の減圧度のときには窒素ガス投入弁を開いて
洗浄・乾燥系内がほぼ大気圧に達するまで窒素ガスを投
入するので、パッキングの不良などがあっても洗浄・乾
燥系内に外気が流入するおそれが全くなくなるばかりで
なく、系内の酸素濃度をさらに薄くして安全な運転を行
なうことができる効果がある。As described above, according to the present invention, when the cleaning process and the drying process according to the program set in the microcomputer control unit are started, the pressure in the cleaning / drying system is always maintained by the pressure detecting means 6 for controlling the nitrogen gas charging. The detected pressure is much weaker than when the first nitrogen gas was introduced.
When the decompression degree is mHg or higher, the nitrogen gas injection valve is opened and nitrogen gas is injected until the inside of the cleaning / drying system reaches almost atmospheric pressure, so even if there is a defective packing, outside air flows into the cleaning / drying system. Not only is there no danger of this happening, but there is the effect that the oxygen concentration in the system can be made even thinner to allow safe operation.
図１は本発明の運転制御方法を示すフローチャートであ
る。 図２は本発明を適用したドライクリーニング装置の構成
を示すブロック図である。FIG. 1 is a flowchart showing the operation control method of the present invention. FIG. 2 is a block diagram showing the configuration of a dry cleaning device to which the present invention is applied.
１…ドライクリーニング装置の洗浄・乾燥系、２…同じ
く蒸留系、３…窒素ガス投入弁、４…窒素ガスタンク、
５…窒素ガス発生装置、６…窒素ガス投入制御用圧力検
出手段、７…マイコン制御部、８…洗浄・乾燥系用の電
磁開閉バキューム弁、９，９′…蒸留系用の電磁開閉バ
キューム弁、１０…バキュームポンプ、１１…洗浄・乾
燥系の減圧制御用圧力検出手段、１２…エアバランス
弁。1 ... Cleaning / drying system for dry cleaning device, 2 ... Distillation system, 3 ... Nitrogen gas input valve, 4 ... Nitrogen gas tank,
5 ... Nitrogen gas generator, 6 ... Nitrogen gas injection control pressure detecting means, 7 ... Microcomputer control section, 8 ... Electromagnetic open / close vacuum valve for cleaning / drying system, 9, 9 '... Electromagnetic open / close vacuum valve for distillation system 10 ... Vacuum pump, 11 ... Pressure detection means for decompression control of cleaning / drying system, 12 ... Air balance valve.
Claims (1)
を投入してマイコン制御により洗浄および乾燥工程を行
ない、洗浄工程により汚れた溶剤を蒸留系に移送し、そ
の蒸留系内を減圧しながら溶剤を蒸留すべくなした可燃
性溶剤使用のドライクリーニング装置において、プログ
ラムに設定したマイコン制御を開始すると、洗浄・乾燥
系内の圧力を常に検出し、その検出圧力が最初の不活性
ガス投入時よりはるかに弱いある設定減圧度以上の減圧
度であることを検出すると、洗浄・乾燥系内に不活性ガ
スを投入してほぼ大気圧と等しい圧力を維持させること
を特徴とする可燃性溶剤使用のドライクリーニング装置
における安全運転制御方法。1. A washing / drying system is depressurized, and then an inert gas is introduced to carry out a washing and drying process under microcomputer control. A solvent contaminated by the washing process is transferred to a distillation system, and the distillation system is depressurized. However, in a dry cleaning device that uses a flammable solvent to distill the solvent, when the microcomputer control set in the program is started, the pressure in the cleaning / drying system is always detected, and the detected pressure is the first inert gas. Flammability characterized by injecting an inert gas into the cleaning / drying system to maintain a pressure almost equal to atmospheric pressure when it detects that the pressure is higher than a certain set pressure, which is much weaker than the time of injection. A safe operation control method for a dry cleaning device using a solvent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4169273A JPH067588A (en) | 1992-06-26 | 1992-06-26 | Safe operation control method for dry cleaning apparatus using combustible solvent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4169273A JPH067588A (en) | 1992-06-26 | 1992-06-26 | Safe operation control method for dry cleaning apparatus using combustible solvent |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH067588A true JPH067588A (en) | 1994-01-18 |
Family
ID=15883455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4169273A Pending JPH067588A (en) | 1992-06-26 | 1992-06-26 | Safe operation control method for dry cleaning apparatus using combustible solvent |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH067588A (en) |
-
1992
- 1992-06-26 JP JP4169273A patent/JPH067588A/en active Pending
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