CN1138435A - 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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- CN1138435A CN1138435A CN 96101841 CN96101841A CN1138435A CN 1138435 A CN1138435 A CN 1138435A CN 96101841 CN96101841 CN 96101841 CN 96101841 A CN96101841 A CN 96101841A CN 1138435 A CN1138435 A CN 1138435A
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Abstract
A vacuumizing system with three-stage jet pumps for moistening tobacco leaves features that the initial and final jet pumps have a same compression ratio, two inter-stage condensers are surfical-type or mixed one, and vacuum degree sensor is absolute pressure one. Its advantages include compact structure, high efficiency, less energy consumption and long service life.
Description
The present invention relates to make the vacuum plant of the uncured tobacco humidity of packing, particularly relate to a kind of vacuum acquiring system of using for tobacco leaf conditioning.
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 condensation by mixing of arranging
Device (CN 2065823U);
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 work system 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 increased 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.
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 of the present invention to existing two-stage injection pump vacuum system;
Fig. 8 is the improvement project 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 (4,6,4a), 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).
Purpose of the present invention can realize by following measure:
The present invention includes three grades of steam jet pumps (3,5,7) and two intercondensers (4,6), install starting jet pump (9) additional in the exit of first order condenser (4) or second level condenser (6), the compression ratio that it is characterized in that starting jet pump (9) is identical with the compression ratio of final stage jet pump (7), and two intercondensers (4,6) adopt surface condenser or adopt mixing condenser.The sensor (32) that is used for measurement of vacuum in the system is an absolute pressure transducer.
Purpose of the present invention can also reach by following measure:
When intercondenser adopts mixing condenser, in the fluid storage tank of condenser, be provided with fluid level controller (38), water circulating pump (33) and by the by-passing valve (35) of electronic or pneumatic control; Whole system is the integrated structure that can make things convenient for the compactness that dock with the vacuum chamber of existing various types.
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), start the startup jet pump (9) of final stage jet pump (7) and band check valve (8) then simultaneously, the gas pressure intensity in vacuum tank this moment (1) is by atmospheric pressure P.Drop to the A point on the course of work curve (Fig. 2) gradually, close the steam valve (22) that starts jet pump (9), under the effect of atmospheric pressure, check valve (8) is closed automatically, stops air to flow backwards.Meanwhile open the steam valve (20) of second level jet pump (5), under the acting in conjunction of jet pump (5,7), the gas pressure intensity in the vacuum tank (1) 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 the acting in conjunction of jet pump (3,5,7), and the C that touches the bottom of the gas pressure intensity in the vacuum tank 1.Useless working steam of being discharged by jet pump (3,5) and the condensable gas of from vacuum tank (1), extracting out, in condenser (4,6), be condensed into liquid and accumulate in the condensed water tank (11,12), the bottom of condensation water tank (11,12) is equipped with check valve (13,14) respectively.Externally in atmospheric pressure and the condenser under the acting in conjunction of parital vacuum, valve (13,14) is in closed condition.After vacuum finishes, steam off valve (19,20,21), each jet pump quits work.Vacuum expendable pattern in the condenser (4,6), check valve (13,14) is opened automatically, discharges condensed water.
Enter silencer (10) at last by the air of jet pump discharge and the water vapour that had not condensed, gas is discharged by blast pipe (25), and liquid then enters sewer by drainpipe (24).
After vacuum finished, the breather cheek valve on the vacuum tank (2) was closed under the atmospheric pressure effect automatically.Vacuum tank is in complete air-tight state, and can change next operation stage over to, as injecting water vapour so that tobacco leaf conditioning in vacuum tank.
Absolute pressure sensor on the vacuum tank (32) detects the absolute pressure in the vacuum tank.This pressure signal is used to control the open and close of each steam valve (19,20,21,22) after control system is handled.Simultaneously, also can show and record by the display recorder table.
The water inlet pipe of condenser (27) is connected with cooling water recirculation system (31) with outlet pipe (26).Cooling tower (29) is passed to atmosphere to the heat of discharging from condenser.Be transported to condenser through cooled cooling water again 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 advantage:
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, in the fluid storage tank of condenser, be provided with fluid level controller (38), water circulating pump (33) and by the by-passing valve (35) of electronic or pneumatic control recycles cooling water, thereby does not also need to be equipped with jumbo cooling water tank.
3, the mensuration of vacuum is in time accurate;
The present invention adopts absolute pressure sensor, replaced with the conventional instrument of atmospheric pressure as measuring basis, and as spring 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 the vacuum tank of different types.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 recirculation system (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, and the water section of being got by pump (33) is back in the condenser tank.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 water.Thermometer (39) detects the water temperature in the condenser, the aperture of adjustable valve (37) in view of the above.Check valve (34) is prevented and treated 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 (3)
1, a kind of tobacco leaf conditioning vacuum acquiring system, comprise three grades of steam jet pumps (3,5,7) and two intercondensers (4,6), install starting jet pump (9) additional in the exit of first order condenser (4) or second level condenser (6), the compression ratio that it is characterized in that starting jet pump (9) is identical with the compression ratio of final stage jet pump (7), two intercondensers (4,6) adopt surface condenser or adopt mixing condenser, and the sensor (32) that is used for measurement of vacuum in the system is an absolute pressure transducer.
2, vacuum acquiring system according to claim 1 when intercondenser adopts mixing condenser, is 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 or pneumatic control.
3,, it is characterized in that whole system is the integrated structure that can make things convenient for the compactness that dock with the vacuum chamber of existing various types according to claim 1,2 described vacuum acquiring systems.
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 true CN1138435A (en) | 1996-12-25 |
| CN1049809C 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 |
|---|---|
| CN (1) | CN1049809C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110638079A (en) * | 2019-11-20 | 2020-01-03 | 河南中烟工业有限责任公司 | Vacuum moisture regaining 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 |
-
1996
- 1996-01-29 CN CN 96101841 patent/CN1049809C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110638079A (en) * | 2019-11-20 | 2020-01-03 | 河南中烟工业有限责任公司 | Vacuum moisture regaining machine for tobacco and control method |
| 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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| Publication number | Publication date |
|---|---|
| CN1049809C (en) | 2000-03-01 |
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