CN108252150B - Energy-saving and consumption-reducing system of papermaking drying cylinder - Google Patents
Energy-saving and consumption-reducing system of papermaking drying cylinder Download PDFInfo
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- CN108252150B CN108252150B CN201611249564.4A CN201611249564A CN108252150B CN 108252150 B CN108252150 B CN 108252150B CN 201611249564 A CN201611249564 A CN 201611249564A CN 108252150 B CN108252150 B CN 108252150B
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- water
- flash evaporation
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- tower
- liquid level
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- 238000001035 drying Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 173
- 238000001704 evaporation Methods 0.000 claims abstract description 50
- 230000008020 evaporation Effects 0.000 claims abstract description 50
- 239000000498 cooling water Substances 0.000 claims abstract description 35
- 238000011010 flushing procedure Methods 0.000 claims abstract description 16
- 238000004140 cleaning Methods 0.000 claims abstract description 12
- 230000001105 regulatory effect Effects 0.000 claims abstract description 9
- 230000001276 controlling effect Effects 0.000 claims abstract 3
- 239000007788 liquid Substances 0.000 claims description 34
- 238000004891 communication Methods 0.000 claims description 13
- 230000007613 environmental effect Effects 0.000 abstract 1
- 230000008676 import Effects 0.000 description 11
- 238000001816 cooling Methods 0.000 description 7
- 238000005406 washing Methods 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- 238000007701 flash-distillation Methods 0.000 description 4
- 239000012153 distilled water Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/20—Waste heat recovery
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
- D21F5/10—Removing condensate from the interior of the cylinders
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- Paper (AREA)
Abstract
The invention relates to an energy-saving and consumption-reducing system of a papermaking drying cylinder, which comprises a drying cylinder (1), a multi-stage flash evaporation unit and a water temperature regulating and controlling unit which are sequentially connected through a condensed water pipeline, wherein the water temperature regulating and controlling unit comprises a cooling water tower (3), the cooling water tower (3) is provided with a condensed water inlet, a clear water inlet and a warm water outlet, the multi-stage flash evaporation unit is connected with the condensed water inlet of the cooling water tower, and the warm water outlet is connected with a cleaning unit (4) for flushing a papermaking net cage and a papermaking felt. Compared with the prior art, the invention has the advantages of high energy and water resource utilization efficiency, environmental protection and the like.
Description
Technical Field
The invention relates to the technical field of clean papermaking, in particular to an energy-saving and consumption-reducing system of a papermaking dryer.
Background
BF12 paper machines in paper mills produce 53 tons per day, with a paper-per-ton steam consumption of 2.5 tons per ton of paper, and daily cylinders are used for drying the paper web to produce about 92 tons of condensate water, which is at about 95 ℃, saturated high temperature softened water, and also clean distilled water, suitable for reuse as boiler feed water. But I am currently uses the boiler to stop the use of the boiler for centralized steam supply. The condensed water is concentrated to a water tank, naturally cooled and then discharged. Thus, the electric power is consumed, and the condensed water with good quality is wasted. Therefore, it is necessary for a paper mill employing concentrated steam supply to employ an effective recovery system to maximize recovery of the heat energy and softened water of the system.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the energy-saving and consumption-reducing system of the papermaking dryer, which has high energy and water resource utilization efficiency and is environment-friendly.
The aim of the invention can be achieved by the following technical scheme:
the utility model provides a papermaking dryer energy saving and consumption reduction system, includes dryer, multistage flash distillation unit and the temperature regulation and control unit that connects gradually through the condensate water pipeline, the temperature regulation and control unit include cooling tower, cooling tower be equipped with comdenstion water import, clear water import and warm water export, multistage flash distillation unit and cooling tower's comdenstion water import connect, warm water export be connected with the cleaning unit that is used for washing papermaking cylinder mould and papermaking woollen blanket.
As the preferable technical scheme, the water temperature regulation and control unit also comprises a liquid level control assembly, wherein the liquid level control assembly comprises a liquid level sensor and a control valve which are connected through communication, and an overflow weir arranged on the upper part of the cooling water tower, and the overflow weir is connected with an overflow pipe.
As the preferable technical scheme, the liquid level sensor and the control valve which are in communication connection adopt a floating ball type liquid level control valve, the floating ball type liquid level control valve is arranged at a clean water inlet, and the height of a floating ball of the floating ball type liquid level control valve is matched with the height of an overflow weir.
As a preferable technical scheme, the water temperature regulating unit further comprises a temperature control component, and the temperature control component comprises a temperature sensor in communication connection with the control valve.
As the preferable technical scheme, multistage flash unit include first flash tank, second flash tank, third flash tank, heat pump and heat exchanger, each flash tank all is equipped with comdenstion water import, comdenstion water export and steam outlet, the comdenstion water import of first flash tank is connected with the comdenstion water export of dryer, the steam outlet of first flash tank leads to the heat pump, the comdenstion water export of first flash tank is connected with the comdenstion water import of second flash tank, the steam outlet of second flash tank leads to the heat exchanger, the comdenstion water export of second flash tank is connected with the comdenstion water import of third flash tank, the comdenstion water export of third flash tank is connected with the comdenstion water import of cooling tower.
As a preferred technical solution, the steam outlet of the third flash tank is open to the atmosphere.
As the preferable technical scheme, the clean water inlet is connected with a clean water pipeline, and the steam outlet of the third flash tank is connected with the clean water pipeline through a dividing wall type heat exchanger.
As the preferable technical scheme, the bottom of the dividing wall type heat exchanger is provided with a condensate water outlet, the condensate water outlet is connected with a condensate water pipeline arranged between the multi-stage flash evaporation unit and the cooling water tower, and the top of the dividing wall type heat exchanger is provided with a steam outlet.
As the preferable technical scheme, the cleaning unit comprises a high-pressure water pump, a papermaking cylinder mould washing tap and a papermaking blanket washing tap which are respectively connected with the high-pressure water pump, wherein a water inlet of the high-pressure water pump is connected with a warm water outlet of a cooling water tower, and a switching valve is arranged at the joint of a water outlet of the high-pressure water pump and each washing tap.
Compared with the prior art, the invention has the following beneficial effects:
(1) The heat energy of the condensed water of the drying cylinder is recovered step by adopting the multi-stage flash evaporation unit, the grade of the obtained energy is reduced in sequence in the step by step recovery process, and the energy of different grades is utilized in sequence by adopting the heat pump, the heat exchanger and the exhaust atmosphere (or the dividing wall type heat exchanger), so that the energy utilization efficiency is improved, and the pollution of secondary steam generated by directly discharging the condensed water in the drying cylinder to the factory environment is reduced.
(2) The condensed water produced by the multi-stage flash evaporation unit has low energy grade, but is clean distilled water, and the distilled water and clean water are introduced into the cooling water tower together to produce warm water with the temperature of about 30-40 ℃ which is supplied to the flushing units of the papermaking net cage and the papermaking felt, so that the waste of condensed water is avoided, the produced warm water has a much better effect for cleaning the papermaking net cage and the papermaking felt than the effect for directly flushing the papermaking net cage and the papermaking felt by the clean water, and the cleaning efficiency is improved. And energy waste caused by independently heating clear water is avoided.
(3) The cooling water tower avoids too much waste clear water through the liquid level sensor (floating ball), and once too much water is stored in the cooling water tower and sensed by the liquid level sensor, the clear water is closed, so that the waste of clear water is avoided.
(4) The temperature sensor is in communication connection with the control valve at the clean water inlet, so that the temperature in the cooling water tower can be fed back in real time, the flow of the clean water is regulated, the waste of the clean water is avoided through the cooperation of the liquid level sensor and the temperature sensor, and the water temperature control in the cooling water tower is more stable.
(5) The steam of the third flash tank is subjected to heat exchange through the dividing wall type heat exchanger, clean water entering the cooling water tower is heated, the energy utilization efficiency is further improved, and the utilization rate of the condensate water is also improved due to the produced condensate water. By the measures of the technical scheme, 2 tons of water is saved per ton of paper, and the water saving effect is obvious.
Drawings
Fig. 1 is a schematic structural diagram of an energy saving and consumption reduction system of a papermaking dryer in embodiment 1 of the invention.
In the figure, 1 is a drying cylinder, 21 is a first flash tank, 22 is a second flash tank, 23 is a third flash tank, 24 is a heat pump, 25 is a heat exchanger, 3 is a cooling water tower, 31 is a control valve, 32 is a liquid level sensor, 33 is a temperature sensor, 34 is a clear water pipeline, 35 is an overflow weir, 36 is an overflow pipe, 4 is a cleaning unit, 41 is a high-pressure water pump, 42 is a papermaking wire cage flushing faucet, 43 is a papermaking blanket flushing faucet, 44 is a switching valve, and 5 is a dividing wall type heat exchanger.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples.
Example 1
The utility model provides a papermaking dryer energy saving and consumption reduction system, as shown in figure 1, includes dryer 1, multistage flash distillation unit and the temperature regulation and control unit that connects gradually through the condensate water pipeline, and the temperature regulation and control unit includes cooling tower 3, and cooling tower 3 is equipped with comdenstion water import, clear water import and warm water export, and multistage flash distillation unit is connected with the comdenstion water import of cooling tower, and the warm water export is connected with the cleaning unit 4 that is used for washing papermaking cylinder mould and papermaking woollen blanket.
The multi-stage flash evaporation unit comprises a first flash evaporation tank 21, a second flash evaporation tank 22, a third flash evaporation tank 23, a heat pump 24 and a heat exchanger 25, wherein each flash evaporation tank is provided with a condensate water inlet, a condensate water outlet and a steam outlet, the condensate water inlet of the first flash evaporation tank 21 is connected with the condensate water outlet of the drying cylinder 1, the steam outlet of the first flash evaporation tank 21 is led to the heat pump 24, the condensate water outlet of the first flash evaporation tank 21 is connected with the condensate water inlet of the second flash evaporation tank 22, the steam outlet of the second flash evaporation tank 22 is led to the heat exchanger 25, the condensate water outlet of the second flash evaporation tank 22 is connected with the condensate water inlet of the third flash evaporation tank 23, and the condensate water outlet of the third flash evaporation tank 23 is connected with the condensate water inlet of the cooling water tower 3. The clean water inlet is connected with a clean water pipeline 34, and the steam outlet of the third flash tank 23 is connected with the clean water pipeline 34 through a dividing wall type heat exchanger 5. The bottom of the dividing wall type heat exchanger 5 is provided with a condensate outlet, the condensate outlet is connected with a condensate pipeline arranged between the multi-stage flash evaporation unit and the cooling water tower 3, and the top of the dividing wall type heat exchanger 5 is provided with a steam outlet.
The diameter of the cooling water tower of this embodiment is 2m, the height is 5.5m, the water temperature regulation and control unit still includes liquid level control assembly and temperature control assembly, and liquid level control assembly includes liquid level sensor 32 and control valve 31 and the overflow weir 35 of setting on cooling water tower 3 upper portion through communication connection, and overflow weir 35 is connected with overflow pipe 36. The liquid level sensor 32 and the control valve 31 which are in communication connection adopt a floating ball type liquid level control valve, the floating ball type liquid level control valve is arranged at a clean water inlet, the height of a floating ball of the floating ball type liquid level control valve is matched with the height of an overflow weir 35, and the temperature control assembly comprises a temperature sensor 33 which is in communication connection with the control valve 31, and water in the cooling water tower is changed into warm water with the temperature of 35 ℃ through the liquid level control assembly and the temperature control assembly.
The cleaning unit 4 comprises a high-pressure water pump 41, a papermaking net cage flushing faucet 42 and a papermaking felt flushing faucet 43 which are respectively connected with the high-pressure water pump 41, a water inlet of the high-pressure water pump 41 is connected with a warm water outlet of the cooling water tower 3, and a switching valve 44 is arranged at the joint of a water outlet of the high-pressure water pump 41 and each flushing faucet.
Example 2
An energy-saving and consumption-reducing system of a papermaking drying cylinder comprises a drying cylinder 1, a multi-stage flash evaporation unit and a water temperature regulating unit which are sequentially connected through a condensed water pipeline, wherein the water temperature regulating unit comprises a cooling water tower 3, the cooling water tower 3 is provided with a condensed water inlet, a clear water inlet and a warm water outlet, the multi-stage flash evaporation unit is connected with the condensed water inlet of the cooling water tower, and the warm water outlet is connected with a cleaning unit 4 for flushing the papermaking net cage and the papermaking felt.
The multi-stage flash evaporation unit comprises a first flash evaporation tank 21, a second flash evaporation tank 22, a third flash evaporation tank 23, a heat pump 24 and a heat exchanger 25, wherein each flash evaporation tank is provided with a condensate water inlet, a condensate water outlet and a steam outlet, the condensate water inlet of the first flash evaporation tank 21 is connected with the condensate water outlet of the drying cylinder 1, the steam outlet of the first flash evaporation tank 21 is led to the heat pump 24, the condensate water outlet of the first flash evaporation tank 21 is connected with the condensate water inlet of the second flash evaporation tank 22, the steam outlet of the second flash evaporation tank 22 is led to the heat exchanger 25, the condensate water outlet of the second flash evaporation tank 22 is connected with the condensate water inlet of the third flash evaporation tank 23, and the condensate water outlet of the third flash evaporation tank 23 is connected with the condensate water inlet of the cooling water tower 3. The vapor outlet of the third flash tank 23 is vented to atmosphere.
The water temperature regulation and control unit also comprises a liquid level control assembly, wherein the liquid level control assembly comprises a liquid level sensor 32 and a control valve 31 which are connected through communication, and an overflow weir 35 which is arranged at the upper part of the cooling water tower 3, and the overflow weir 35 is connected with an overflow pipe 36. The liquid level sensor 32 and the control valve 31 which are connected in a communication way adopt a floating ball type liquid level control valve which is arranged at a clean water inlet, the height of the float-type liquid level control valve matches the height of the overflow weir 35.
The cleaning unit 4 comprises a high pressure water pump 41 and a wire-making basket flushing tap 42 and a wire-making felt flushing tap 43 respectively connected with the high pressure water pump 41, the water inlet of the high-pressure water pump 41 is connected with the warm water outlet of the cooling water tower 3, and the connection part of the water outlet of the high-pressure water pump 41 and each flushing tap is provided with a switching valve 44.
Claims (1)
1. The energy-saving and consumption-reducing system for the papermaking drying cylinder is characterized by comprising the drying cylinder (1), a multi-stage flash evaporation unit and a water temperature regulating unit which are sequentially connected through a condensed water pipeline, wherein the water temperature regulating unit comprises a cooling water tower (3), the cooling water tower (3) is provided with a condensed water inlet, a clear water inlet and a warm water outlet, the multi-stage flash evaporation unit is connected with the condensed water inlet of the cooling water tower, and the warm water outlet is connected with a cleaning unit (4) for flushing a papermaking net cage and a papermaking felt;
the multistage flash evaporation unit comprises a first flash evaporation tank (21), a second flash evaporation tank (22), a third flash evaporation tank (23), a heat pump (24) and a heat exchanger (25), wherein each flash evaporation tank is provided with a condensate water inlet, a condensate water outlet and a steam outlet, the condensate water inlet of the first flash evaporation tank (21) is connected with the condensate water outlet of the drying cylinder (1), the steam outlet of the first flash evaporation tank (21) is led to the heat pump (24), the condensate water outlet of the first flash evaporation tank (21) is connected with the condensate water inlet of the second flash evaporation tank (22), the steam outlet of the second flash evaporation tank (22) is led to the heat exchanger (25), the condensate water outlet of the second flash evaporation tank (22) is connected with the condensate water inlet of the third flash evaporation tank (23), and the condensate water outlet of the third flash evaporation tank (23) is connected with the condensate water inlet of the cooling water tower (3); the clean water inlet is connected with a clean water pipeline (34), a steam outlet of the third flash tank (23) is connected with the clean water pipeline (34) through a dividing wall type heat exchanger (5), a condensate water outlet is arranged at the bottom of the dividing wall type heat exchanger (5), the condensate water outlet is connected with a condensate water pipeline arranged between the multi-stage flash evaporation unit and the cooling water tower (3), and a steam outlet is arranged at the top of the dividing wall type heat exchanger (5);
the cleaning unit (4) comprises a high-pressure water pump (41), a papermaking cylinder mould flushing faucet (42) and a papermaking blanket flushing faucet (43) which are respectively connected with the high-pressure water pump (41), wherein a water inlet of the high-pressure water pump (41) is connected with a warm water outlet of the cooling water tower (3), and a switching valve (44) is arranged at the joint of a water outlet of the high-pressure water pump (41) and each flushing faucet;
the water temperature regulating and controlling unit also comprises a liquid level control assembly and a temperature control assembly, wherein the liquid level control assembly comprises a liquid level sensor (32) and a control valve (31) which are connected through communication and an overflow weir (35) arranged at the upper part of the cooling water tower (3), the overflow weir (35) is connected with an overflow pipe (36), the liquid level sensor (32) and the control valve (31) which are connected through communication adopt a floating ball type liquid level control valve, the floating ball type liquid level control valve is arranged at a clean water inlet, and the height of a floating ball of the floating ball type liquid level control valve is matched with the height of the overflow weir (35); the temperature control assembly comprises a temperature sensor (33) which is in communication connection with the control valve (31), and the water in the cooling water tower is changed into warm water with the temperature of 35 ℃ through the liquid level control assembly and the temperature control assembly;
once the water in the cooling water tower (3) is excessively stored, the water is sensed by the liquid level sensor (32), and the clean water is closed; the temperature sensor is in communication connection with a control valve at the clean water inlet and is used for feeding back the temperature in the cooling water tower (3) in real time and adjusting the flow of the clean water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611249564.4A CN108252150B (en) | 2016-12-29 | 2016-12-29 | Energy-saving and consumption-reducing system of papermaking drying cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611249564.4A CN108252150B (en) | 2016-12-29 | 2016-12-29 | Energy-saving and consumption-reducing system of papermaking drying cylinder |
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| CN108252150A CN108252150A (en) | 2018-07-06 |
| CN108252150B true CN108252150B (en) | 2024-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611249564.4A Active CN108252150B (en) | 2016-12-29 | 2016-12-29 | Energy-saving and consumption-reducing system of papermaking drying cylinder |
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| CN108252150A (en) | 2018-07-06 |
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