CN1049809C - Energy-saving vacuum acquiring system of 3-staged jetting pump for remoistening of tobacco leaves - Google Patents
Energy-saving vacuum acquiring system of 3-staged jetting pump for remoistening of tobacco leaves Download PDFInfo
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- CN1049809C CN1049809C CN 96101841 CN96101841A CN1049809C CN 1049809 C CN1049809 C CN 1049809C CN 96101841 CN96101841 CN 96101841 CN 96101841 A CN96101841 A CN 96101841A CN 1049809 C CN1049809 C CN 1049809C
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Abstract
The present invention discloses an energy-saving vacuum acquiring system of a three-stage jet pump for remoistening tobacco leaves. The system is characterized in that the compression ratio of a starting jet pump is the same as the compression ratio of the jet pump of a last stage; a condenser between the two stages is a surface condenser or a mixing condenser; a sensor which is used for measuring the vacuum degree in the system is an absolute pressure sensor; the whole system is in a compact integrated structure. The present invention has the advantages of reasonable structure, high efficiency, small energy consumption, low cost, long service life and convenient installation and maintenance.
Description
The present invention relates to make the vacuum plant of the uncured tobacco humidity of packing, particularly relate to the vacuum acquiring system that a kind of tobacco leaf conditioning is used.
Humidity and the toughness of tobacco business in order to increase tobacco leaf generally adopts steam to spray vacuum system tobacco leaf is handled, and in order to raise the efficiency and to cut down the consumption of energy, countries in the world have carried out constantly exploring at this point, have successively proposed many technical schemes.As:
1. adopt water-ring vacuum pump connect with the second steam jet pump (the product sixties);
2. water-ring vacuum pump connect with the single-stage steam jet pump (the product eighties);
3. second steam jet pump, spraying condenser (the product eighties);
4. the multistage steam jet pump of tape starting pump, the high-order iris type mixing condenser of arranging (CN2065823U);
5. in cooling system, be with the vacuum system of refrigerating plant.
These technical schemes have had constantly to be improved with perfect, but the part that all also comes with some shortcomings.1., 2. two kinds of systems, be combination in theory with optimum energy-saving effect, be widely adopted in the seventies.Contained corrosive gas and a large amount of dust in the medium owing to take out, make the corrosion and the serious wear of water ring pump, service life is extremely short, has increased the maintenance load and the maintenance cost of system.Moreover the 1. in the kind system, cooling water and condensed water are collected in the airtight water tank, because the restriction of water tank capacity has restricted the supply of cooling water, thereby cool off insufficiently, have influenced the performance of whole system.In addition, owing to do not reclaim cooling water, cause the waste of water resource.3. the plant system, cancelled water ring pump, simplifies the structure, and reduced maintenance load, but require working steam that higher pressure (general meter pressure should greater than 0.8MPa) is arranged, and the flow of working steam and consumption all the system than other type is big.Force user's jumbo steam boiler that must change the outfit, just can make system's operate as normal.The 4. the kind system adopt multistage jet pump to replace water ring pump and two-stage injection pump, be the improvement of system that first three is planted, but it still kept the 1. in the kind system because of adopting the existing shortcoming of cooling water tank.The 5. the kind system adopt surface condenser, after cooling medium is handled through refrigeration system, can reach 5 ℃ low temperature, be significantly less than environment temperature, can make the higher vacuum of condenser, also just make whole system might obtain higher vacuum, but meanwhile also just increase the complexity and the maintenance difficult of system.Another shortcoming of this system is that other system of not only maintenance difficult, and noise ratio all wants big owing to adopted the roots-type vavuum pump of complicated in mechanical structure.
The objective of the invention is at the deficiencies in the prior art part, provide a kind of rational in infrastructure, the efficient height, energy consumption is little, and cost is low, long service life, installation and maintenance are the 3-staged jetting pump for remoistening of tobacco leaves vacuum system easily.
Purpose of the present invention can realize by following measure:
The present invention includes vacuum tank, vapor distribution device, steam valve, pipeline, three grades of steam jet pumps and two intercondensers install the starting jet pump additional in the exit of first order condenser or second level condenser.The outlet of vacuum tank links to each other by the inlet of breather cheek valve with first order jet pump, and the first order is sprayed delivery side of pump and linked to each other with the inlet of first order condenser, and the outlet of first order condenser links to each other with the inlet of second level jet pump.The second level is sprayed delivery side of pump and is linked to each other with the inlet of second level condenser; The outlet of second level condenser links to each other with the inlet of third level jet pump, and the third level is sprayed delivery side of pump and links to each other with the inlet of exhaust silencer.Vacuum check valve and starting jet pump and third level jet pump are parallel with one another; The compression ratio of starting jet pump is identical with the compression ratio of third level jet pump.Intercondenser can adopt surface condenser or adopt mixing condenser.Surface condenser has condensed water tank and check valve of water drainage, and the sensor that is used for measurement of vacuum in the system is an absolute pressure transducer; Adopt vapor distribution device to provide working steam to jet pump, the outlet of steam main valve links to each other with the inlet of steam cylinder and links to each other with the nozzle of jet pump respectively by steam valve, and steam cylinder is provided with Pressure gauge, drain valve.
Purpose of the present invention can also reach by following measure:
When intercondenser employing surface condenser, the bottom of each condenser connects a condensation water tank respectively, and check valve is housed respectively on the condensation water tank.
When intercondenser adopts mixing condenser, in the fluid storage tank of condenser, be provided with fluid level controller, water circulating pump and by the by-passing valve of electronic or pneumatic control, condensed water is discharged with cooling water.
Whole system of the present invention is the integrated structure that can make things convenient for the compactness that dock with the vacuum chamber of existing various types.
Below in conjunction with accompanying drawing and embodiment shown in the drawings, the content of inventing is described in detail, but summary of the invention is not limited to shown in the accompanying drawing.
Fig. 1 is general structure of the present invention and operation principle schematic diagram;
Fig. 2 is a course of work curve map of the present invention;
Fig. 3 is the vacuum system schematic diagram of the horizontal layout of the present invention;
Fig. 4 is that A among Fig. 3 is to view;
Fig. 5 is that B among Fig. 3 is to view;
Fig. 6 is the vacuum system schematic diagram of the vertical layout of the present invention;
Fig. 7 is the improvement project schematic diagram of the present invention to existing two-stage injection pump vacuum system;
Fig. 8 is the improvement project schematic diagram of the present invention to existing three grades of jet pump vacuum systems.
Each part description is as follows in Fig. 1～Fig. 8: vacuum tank 1, breather cheek valve 2, steam jet pump 3,5,7,9, check valve 8, condenser 4,6, cooling water tank 4a, 6a, exhaust silencer 10, condensed water tank 11,12, check valve of water drainage 13,14, vapor distribution device 15, steam main valve 16, steam cylinder 17, steam pressure gauge 18, steam valve 19,20,21,22, drain valve 23, drainpipe 24, blast pipe 25, outlet pipe 26, water inlet pipe 27, Pressure gauge 28, cooling tower 29, water circulating pump 30,33, cooling water recirculation system 31, absolute pressure sensor 32, check valve 34, Pneumatic butterfly valve 35, valve 36,37, fluid level controller 38, thermometer 39.
The course of work of the present invention and principle are as follows:
During system works, at first open steam main valve 16 and start water circulating pump 30, close vacuum tank 1, then Start simultaneously third level jet pump 7 and with the startup jet pump 9 of check valve 8, the gas pressure intensity in this moment vacuum tank 1 By atmospheric pressure P. Drop to gradually the A point on the course of work curve shown in Figure 2, close and start jet pump 9 Steam valve 22, under the effect of atmospheric pressure, check valve 8 autoshutdowns stop air to flow backwards. Meanwhile Open the steam valve 20 of second level jet pump 5, under jet pump 5,7 acting in conjunction, the gas in the vacuum tank 1 Pressure is reduced to the B point on the course of work curve. Then open the steam valve 19 of first order jet pump 3 this moment, Under jet pump 3,5,7 the acting in conjunction, the C that touches the bottom of the gas pressure intensity in the vacuum tank. By jet pump 3, The 5 useless working steams of discharging and the condensable gas of extracting out from vacuum tank 1 are condensed in condenser 4,6 Liquid also accumulates in the condensed water tank 11,12, and check valve is equipped with respectively in condensed water tank 11,12 bottom 13,14. Externally in atmospheric pressure and the condenser under the acting in conjunction of parital vacuum, valve 13,14 is in closes State. After vacuum finishes, steam off valve 19,20,21, each jet pump quits work. Condensation Vacuum expendable pattern in the device 4,6, check valve 13,14 is opened automatically, gets rid of condensed water.
Enter at last silencer 10 by the air of jet pump discharge and the water vapour that had not condensed, gas is by exhaust Pipe 25 is discharged, and liquid then enters sewer by drainpipe 24.
After vacuum finished, the breather cheek valve 2 on the vacuum tank is autoshutdown under big vapor pressure effect. Vacuum tank is in complete air-tight state, and can change next operation stage over to, as injected water steam in to vacuum tank with Make tobacco leaf conditioning.
The absolute pressure that absolute pressure sensor 32 on the vacuum tank detects in the vacuum tank. This pressure signal is through control After system processes, be used for each steam valve 19,20,21 of control, 22 open and close. Simultaneously, can also pass through The display recorder table shows and record.
The water inlet pipe 27 of condenser is connected with cooling water recirculation system 31 with outlet pipe 26. Cooling tower 29 handles are from cold The heat of discharging in the condenser is passed to atmosphere. Be transported to again condenser through cooled cooling water by water circulating pump 30, So constantly recycle. Pressure gauge 28 monitors the duty of cooling water recirculation system.
The present invention compared with prior art has following outstanding characteristics:
1, simple in structure, easy to maintenance, reliable;
In the vacuum acquiring system of the present invention, except that water circulating pump, without any rotating machinery, as lobe pump, water ring pump, condenser pump.System architecture reaches maximum simplification, has reduced maintenance requirement, has increased reliability.
But 2 using water wisely, and dwindle the volume of condensation water tank;
1. work as the present invention and adopt surface-type (heat transfer type) condenser, the medium that is cooled (gas of promptly extracting out from vacuum tank) is isolated mutually with cooling medium (being generally water).Unlikely dust of being extracted out from tobacco bale of cooling medium and corrosive substance are polluted, thereby the consumption of saving cooling medium is simultaneously also for adopting special cooling medium (as low-freezing liquid) or cooling medium being carried out specially treated (as softening processing, freezing processing) created condition.Vacuumize in the circulation, the quality of condensate liquid very limited (only hundreds of kilogram) is not so the present invention needs to be equipped with jumbo condensation water tank at every turn.
2. when the present invention adopts mixing condenser, be provided with fluid level controller 38 in the fluid storage tank of condenser, water circulating pump 33 and by the by-passing valve 35 of electronic and steam-operating control recycles cooling water, thereby does not also need to be equipped with jumbo cooling water tank.
3, the mensuration of vacuum promptly and accurately;
The present invention adopts absolute pressure sensor, replaced with the conventional instrument of atmospheric pressure as measuring basis, and as spring-tube type vacuum meter and Hall type pressure transducer, the difference on the vacuum readings of having avoided being caused because of place to use height above sea level difference.Also avoided because of adopting the measurement hysteresis problem that temperature sensor caused.
4, efficient height, energy consumption is little, and cost is low, long service life;
Speed of exhaust height of the present invention, the cycle that vacuumizes is short, thereby the vacuum tank of same volume can obtain higher productivity ratio.Compare with two-stage injection pump vacuum acquiring system, only need lower working steam pressure and less working steam flow, can reach the purpose of energy savings.
5, system architecture is rationally compact, and integrated degree height can dock with multi-form vacuum tank.Use technical conceive of the present invention, can improve with perfect existing vacuum system easily.
Embodiment 1:
The shell-and-tube cooler of horizontal layout, three grades of steam jet pump vacuum acquiring systems (as shown in Figure 3) of integrated assembling, two condensers are stacked mutually, the main body of construction system, other element is that install on the basis with the condenser.Condenser shell double as condensed water tank, whole system are an independent integral body.
Embodiment 2:
Three grades of steam jet pump vacuum acquiring systems (as shown in Figure 6) of vertical layout, plate-type condenser, the heat transfer coefficient of plate-type condenser is better than shell-and-tube cooler, thereby has higher efficient.
Embodiment 3:
Improvement (as shown in Figure 7) to existing two-stage injection pump vacuum acquiring system, original one-level jet pump 3, inlet valve 2, spraying condenser 4 and cooling water tank 4a keep, new second level jet pump 5 is used in the jet pump cancellation of original second level instead, installs second level mixing condenser 6 additional, third level jet pump 7, the startup pump 9 of band check valve 8.For the cooling water in the condenser of the second level is recycled, water circulating pump 33 is housed, fluid level controller 38 and be subjected to its control Pneumatic butterfly valve 35, when liquid level was in the lower position, valve 35 was opened, the water section of being got by pump 33 is back to cooling water tank 6a.Valve 36 is regulated the flow of recirculation water.When liquid level rose to upper limit position, valve 35 cut out, and the water that pump 33 is got all flows into cooling tower 29, the flow of valve 37 control cooling waters.The water temperature that thermometer 39 detects in the condenser, the aperture of adjustable valve 37 in view of the above.Check valve 34 prevents ducted aqueous reflux.After the improvement, when working steam pressure was reduced to 0.6MPa, system still can steady operation.
Embodiment 4:
Improvement (as shown in Figure 8) to existing three grades of steam jet pump vacuum acquiring systems has been installed cooling water circulating device additional on the water storage tank of mixing condenser, reach water-saving purpose, the shortcoming of having avoided original system chilled(cooling) water supply (CWS) deficiency maybe need equip big capacity cooling water tank.
Claims (4)
1, a kind of tobacco leaf conditioning vacuum acquiring system comprises vacuum tank (1), vapor distribution device (15) steam valve (19,20,21,22), pipeline, three grades of steam jet pumps (3,5,7) and two intercondensers (4,6); Install starting jet pump (9) additional in the outlet of first order condenser (4) or second level condenser (6), the outlet that it is characterized in that vacuum tank (1) links to each other by the inlet of breather cheek valve (2) and first order jet pump (3), the outlet of first order jet pump (3) links to each other with the inlet of first order condenser (4), and the outlet of first order condenser (4) links to each other with the inlet of second level jet pump (5); The outlet of second level jet pump (5) links to each other with the inlet of second level condenser (6); The outlet of second level condenser (6) links to each other with the inlet of third level jet pump (7); The outlet of third level jet pump (7) links to each other with the inlet of exhaust silencer (10), and vacuum check valve (8) and starting jet pump (9) are parallel with one another with third level jet pump (7); The compression ratio of starting jet pump (9) is identical with the compression ratio of third level jet pump (7), and intercondenser (4,6) adopts surface condenser or adopts mixing condenser; Adopt vapor distribution device (15) to provide working steam to jet pump, the outlet of steam main valve (16) links to each other with the inlet of steam cylinder (17) and links to each other with the nozzle of jet pump (3,5,7,9) respectively by steam valve (19,20,21,22), steam cylinder (17) is provided with Pressure gauge (18), drain valve (23).
2, vacuum acquiring system according to claim 1 is characterized in that the bottom of condenser (4,6) has a condensed water tank (11,12) and check valve of water drainage (13,14) respectively when intercondenser adopts surface condenser.
3, vacuum acquiring system according to claim 1, it is characterized in that when intercondenser adopts mixing condenser, in the fluid storage tank of condenser, be provided with fluid level controller (38), water circulating pump (30,33) and by the by-passing valve (35) of electronic or pneumatic control, condensed water is discharged with cooling water.
4, according to claim 1 or 2 or 3 described vacuum acquiring systems, the sensor (32) that it is characterized in that being used in the system measurement of vacuum is an absolute pressure transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96101841 CN1049809C (en) | 1996-01-29 | 1996-01-29 | Energy-saving vacuum acquiring system of 3-staged jetting pump for remoistening of tobacco leaves |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96101841 CN1049809C (en) | 1996-01-29 | 1996-01-29 | Energy-saving vacuum acquiring system of 3-staged jetting pump for remoistening of tobacco leaves |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1138435A CN1138435A (en) | 1996-12-25 |
| CN1049809C true CN1049809C (en) | 2000-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96101841 Expired - Fee Related CN1049809C (en) | 1996-01-29 | 1996-01-29 | Energy-saving vacuum acquiring system of 3-staged jetting pump for remoistening of tobacco leaves |
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| Country | Link |
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| CN (1) | CN1049809C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110638079B (en) * | 2019-11-20 | 2023-09-15 | 河南中烟工业有限责任公司 | Vacuum damping machine for tobacco and control method |
| CN111035041A (en) * | 2019-12-26 | 2020-04-21 | 红云红河烟草(集团)有限责任公司 | Vacuum moisture regain control process for tobacco processing quality homogenization, energy conservation and consumption reduction |
| CN111387539A (en) * | 2020-03-17 | 2020-07-10 | 红云红河烟草(集团)有限责任公司 | Vacuum moisture regaining equipment based on threshing and redrying and process control method thereof |
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1996
- 1996-01-29 CN CN 96101841 patent/CN1049809C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1138435A (en) | 1996-12-25 |
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