CN114909882A - Hot air circulating system of dryer and waste heat utilization and control method thereof - Google Patents
Hot air circulating system of dryer and waste heat utilization and control method thereof Download PDFInfo
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- CN114909882A CN114909882A CN202210720474.8A CN202210720474A CN114909882A CN 114909882 A CN114909882 A CN 114909882A CN 202210720474 A CN202210720474 A CN 202210720474A CN 114909882 A CN114909882 A CN 114909882A
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000002918 waste heat Substances 0.000 title claims abstract description 11
- 239000000112 cooling gas Substances 0.000 claims abstract description 20
- 238000003303 reheating Methods 0.000 claims abstract description 18
- 238000001035 drying Methods 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 6
- 244000025254 Cannabis sativa Species 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 5
- 239000004744 fabric Substances 0.000 claims description 5
- 238000010981 drying operation Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 239000002826 coolant Substances 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- 241001330002 Bambuseae Species 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
- F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/003—Supply-air or gas filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
- F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/06—Chambers, containers, or receptacles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a hot air circulating system of a dryer, which comprises a heater, wherein a steam input pipe and a cooling gas output pipe are connected to the heater, an outlet of the heater is sequentially connected with an input air duct and a main fan, an air outlet of the main fan is sequentially connected with an input air duct and an air inlet on an outer box of the dryer, a wind shield is arranged at the air inlet in the outer box, a notch is formed at the bottom of the outer box and is connected with a collecting air duct, the output air duct, a heat exchange air duct and a heat exchange calandria are sequentially connected, and the heat exchange calandria penetrates through a reheating air duct arranged in the outer box of the dryer and is communicated with an exhaust air duct; the preheating box on the outer box of the dryer is provided with an air inlet and a heat exchanger is distributed in the preheating box, the heat exchanger is communicated with the heater through a cooling gas output pipe, a preheated air outlet of the preheating box is sequentially communicated with a preheating air duct, a reheating air duct, a return air duct and a return air connecting pipe, and the output end of the return air connecting pipe is directly communicated with the heater; the invention also discloses a waste heat utilization and control method of the hot air circulating system.
Description
Technical Field
The invention relates to the field of light equipment, in particular to a hot air circulating system of a dryer and a waste heat utilization and control method thereof.
Background
The dryer is mainly used in occasions such as hotels, hospitals, large-scale washing factories and the like and is used for quickly drying linen such as clothes, sheets, bedsheets and the like. The most mainstream drying method at present is to heat external cold air through a heater and then dry linen in a dryer, and the method has the biggest defect that a large amount of energy is wasted in the process because cold air needs to be continuously sucked and heated and hot air needs to be continuously discharged to the outside, so that many researches are focused on optimizing a hot air system of the dryer.
For example, in the CN200910231673.7 document, it is proposed to arrange a heater and a fan at the top of a dryer, and dry linen by blowing hot air into the dryer, so as to realize simple circulation of hot air in the dryer for one turn, but the heat of the heater is simply utilized once, and the heat is obviously wasted; the technical scheme disclosed in CN201510294656.3 also includes that a heater and a fan are arranged at the top of the dryer, the heated hot air is blown into the dryer inner cylinder, but an air door for blocking the hot air is arranged at the discharge port after the hot air is wound for one circle, so that a part of the hot air can participate in the hot air circulation of the inner cylinder again, the method improves the utilization efficiency of the heated hot air, but the heat utilization of the heater is still incomplete, and the energy cannot be fully utilized; the technical scheme that CN201820028015.2 discloses divides into two upper and lower cavities and lower cavity and fan blast orifice intercommunication with the dryer inner tube, the cavity is gone into to the air heating back of heater that the fan blew out of being located the top, get back to the blast air import via lower cavity again, the continuous circulation of the inside hot-blast of dryer has been realized, but this scheme is a comparatively ideal design, the hot-blast continuous circulation in the dryer that contains a large amount of steam, moisture can not discharge and accumulate more, can't effectively improve the operating efficiency of dryer, the while is also not effectively utilized the comdenstion water heat of heater.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the hot air circulating system can fully utilize the heat of the heater of the dryer and improve the operation efficiency of the dryer.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the hot air circulating system of the dryer comprises a heater arranged on an outer box of the dryer, two interfaces arranged on the heater are respectively connected with a steam input pipe and a cooling gas output pipe, and an outlet of the heater is connected with an input air channel; an air inlet of the main fan is connected with the input air duct, an air outlet of the main fan is connected with the incoming air duct, the incoming air duct is communicated with an air inlet arranged at an opening on the end face of the inner cylinder on the outer box of the dryer, a wind shield is arranged at the air inlet in the outer box of the dryer, and a flow guide part bent towards the opening on the end face of the inner cylinder is arranged on the wind shield; the surface of the inner cylinder of the dryer is distributed with a plurality of small holes, the bottom of the outer cylinder which wraps the inner cylinder and is close to the opening end is provided with a gap and is connected with a collecting air channel, and the other end of the collecting air channel is communicated with a spread air channel positioned at the bottom of the outer box of the dryer; the heat transfer air duct is communicated with a heat exchange air duct arranged in the outer box of the dryer, the heat exchange air duct is connected with a heat exchange calandria, the heat exchange calandria penetrates through a reheating air duct arranged in the outer box of the dryer, and the output end of the heat exchange calandria is communicated with the exhaust air duct;
a preheating box is arranged on the outer side of the outer box of the dryer, a net-shaped air inlet is formed in the preheating box, a heat exchanger is arranged in the preheating box, the heat exchanger in the preheating box is communicated with a heater through a cooling gas output pipe, and a cooling medium output pipe is arranged on the heat exchanger in the preheating box; the preheating air outlet on the preheating box is communicated with the preheating air duct, the output end of the preheating air duct is connected with the reheating air duct positioned at the bottom of the dryer, the output end of the reheating air duct is communicated with the return air duct, the top end of the return air duct is communicated with a return air connecting pipe positioned at the top of the dryer, the output end of the return air connecting pipe is directly communicated with the heater, and the return air connecting pipe and the input air duct are respectively arranged at two sides of the heater.
As a preferable scheme, a filter screen is installed between the air outlet duct and the heat exchange duct.
As a preferred scheme, the output end of the heat exchange calandria is communicated with the auxiliary fan, and the other end of the auxiliary fan is communicated with the exhaust air duct.
Preferably, the heat exchange air duct is arranged along the axial direction of the inner barrel.
As a preferable scheme, the back air duct is arranged between the dryer outer box and the outer drum.
The invention also aims to solve the technical problems that: provides a waste heat utilization method of the hot air circulating system of the dryer.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a waste heat utilization method of a dryer hot air circulation system is provided, the dryer hot air circulation system is any one of the dryer hot air circulation systems, and the waste heat utilization method specifically comprises the following steps:
(1) external cold air enters the preheating box through the auxiliary fan, exchanges heat with a high-temperature condensate water heat exchanger in the preheating box, is primarily heated to form hot air, and enters a hot air re-heating channel;
(2) the primary hot air entering the reheating air duct exchanges heat with the heat exchange calandria to form secondary hot air, and enters the return air connecting pipe from the bottom of the dryer through the return air duct;
(3) after secondary hot air flows into the heater through the air return connecting pipe for heating, the secondary hot air is introduced into the air channel through the main fan and further enters the inner cylinder for drying circulation;
(4) and (4) automatically repeating the steps (1) to (3) by the system until the linen meets the drying requirement.
The other technical problem to be solved by the invention is as follows: provides an operation control method of the hot air circulating system of the dryer.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: an operation control method of a hot air circulating system of a dryer is provided, the hot air circulating system of the dryer is any one of the hot air circulating systems, and the operation control method comprises the following specific processes:
step 1: powering up the system;
step 2: starting a main fan and an auxiliary fan;
and step 3: opening an input valve of a steam input pipe and an output valve on a cooling gas output pipe;
and 4, step 4: the steam enters a pipeline of the heater through the input pipe, exchanges heat with the preheated air from the return air duct, and the temperature of the steam is automatically controlled by the control system according to different drying objects; meanwhile, high-temperature condensate water formed by condensation of hot steam flows into the preheating tank through the cooling gas output pipe;
and 5: under the action of a main fan, hot air flows to the inner barrel, contacts with the cloth grass in the barrel, is heated and dried, enters the heat exchange exhaust pipe through the collecting air duct, the outgoing air duct, the filter screen and finally is discharged through the discharging air duct, and hot air circulation is finished;
step 6: repeating the step 4 and the step 5 until the linen meets the drying index requirement, and executing system closing operation to close the main fan, the auxiliary fan, the input valve of the steam input pipe and the output valve of the cooling gas output pipe;
and 7: and finishing the primary drying operation and stopping the machine.
The invention has the beneficial effects that:
the system fully utilizes the heat generated by the heater of the dryer, and utilizes high-temperature condensed water to heat cold air from the outside for the first time by arranging the external preheating box; the bottom of the dryer is provided with two transverse and longitudinal crossed air channels, and the air which is still hot after drying is discharged through a pipeline, and the primarily heated cold air is heated again, so that the air which reaches the heater and is to be heated is preheated twice. The heat that this scheme reducible heater needs provided, the heat of heating cold wind all comes from the make full use of to the heater surplus heat simultaneously, and need not to establish new heat supply source, very big saving the consumption of the energy.
The efficiency that cold wind heating to the required temperature of stoving can be improved when the cold wind that preheats twice heats in the heater for main fan can supply hot-blast to the drying-machine with faster wind speed, and the improvement of wind speed can realize taking away the hot-blast of containing steam in the section of thick bamboo with faster speed in the inner tube, has still set up the auxiliary fan in the final air outlet department of drying-machine simultaneously, makes the speed of airing exhaust of drying-machine improve. The high blowing speed and the high air exhaust speed are combined to improve the efficiency of drying operation, and the heat of the heater is fully utilized while the linen is quickly dried, so that the dryer is efficient and energy-saving.
The entrance that blows in the inner tube after the drying-machine heating hot-blast has set up the deep bead that has certain water conservancy diversion portion, it can make hot-blast not directly blow to the inner tube below from the inner tube upper end, but make the shrouding that blows in hot-blast striking inner tube tip form the hot-blast motion orbit of horizontal "V" shape in the drying-machine inner tube through suitable inclination, the motion path of hot-blast in the inner tube has been increased, make the interior cloth grass of section of thick bamboo can be more abundant contact with hot-blast, make full use of hot-blast heat, the efficiency of cloth grass stoving has been improved.
Because the filter screen is installed between the air delivery duct and the heat exchange duct, sundries such as fibers on the linen can be filtered.
Because the output end of the heat exchange calandria is communicated with the auxiliary fan, and the other end of the auxiliary fan is communicated with the exhaust air channel, the service conditions of the main fan and the auxiliary fan can be adjusted as required, and the smooth operation of the whole air flow is ensured.
Because the heat exchange air duct is arranged along the axial direction of the inner barrel, the whole structure is more compact and is not easy to damage in the process of carrying.
Because the return air duct is arranged between the outer box of the dryer and the outer barrel, the whole structure is more compact, and the conveyor is not easy to damage during transportation.
Drawings
FIG. 1 is a front view of a drying hot air circulating system according to the present invention;
FIG. 2 is a left side half sectional view of the drying hot air circulating system of the present invention;
FIG. 3 is a rear view of the drying hot air circulating system of the present invention;
fig. 4 is a flow chart of the operation of the drying hot air circulating system of the present invention.
In fig. 1-3: 1-a main fan, 2-a heater, 3-an inner cylinder, 4-a dryer outer box, 5-a heat exchange calandria, 6-a steam input pipe, 7-an input valve, 8-a cooling gas output pipe, 9-an output valve, 10-a preheating box, 11-an auxiliary fan, 12-a net-shaped air inlet, 13-a wind shield, 14-a filter screen and 15-an outer cylinder;
21-an input air duct, 22-an input air duct, 23-a collection air duct, 24-a transmission air duct, 25-a heat exchange air duct, 26-a discharge air duct, 27-a preheating air duct, 28-a reheating air duct, 29-a transmission air duct and 30-a return air connecting pipe.
Detailed Description
As shown in fig. 1 to 3, the present invention is mainly composed of a dryer main body and a hot air circulation system. The main body of the dryer comprises a rectangular dryer outer box 4 for fixing the whole dryer, and a rotatable inner cylinder 3 driven by a motor and an outer cylinder 15 wrapping the inner cylinder and fixedly installed are installed inside the dryer outer box 4.
The hot air circulating system comprises a heater 2 arranged on an outer box 4 of the dryer, two interfaces are arranged on the heater 2 and are respectively connected with a steam input pipe 6 and a cooling gas output pipe 8, and an outlet of the heater 2 is connected with an input air duct 21; an air inlet of the main blower 1 is connected with an input air duct 21, an air outlet of the main blower 1 is connected with an incoming air duct 22, the incoming air duct 22 is communicated with an air inlet arranged at an opening on the end face of the inner cylinder on the outer dryer box 4, a wind shield 13 is arranged at the air inlet in the outer dryer box 4, and a flow guide part bent towards the inside of the opening on the end face of the inner cylinder 3 is arranged on the wind shield 13;
a plurality of small holes are distributed on the surface of the inner cylinder 3 of the dryer, a gap is arranged at the bottom part, close to the opening end, of the outer cylinder 15 wrapping the inner cylinder 3 and is connected with a collection air channel 23, and the other end of the collection air channel 23 is communicated with an air channel 24 which is positioned at the bottom part of the outer box 4 of the dryer; the outgoing air duct 24 is communicated with a heat exchange air duct 25 arranged in the dryer outer box 4, and a filter screen 14 is arranged between the outgoing air duct 24 and the heat exchange air duct 25; the heat exchange air duct 25 is arranged along the axial direction of the inner cylinder;
the heat exchange air duct 25 is connected with the heat exchange calandria 5, the heat exchange calandria 5 passes through the reheating air duct 28 arranged in the dryer outer box 4, the output end of the reheating air duct is communicated with the auxiliary fan 11, and the other end of the auxiliary fan 11 is communicated with the exhaust air duct 26;
a preheating box 10 is arranged on the outer side of the dryer outer box 4, a net-shaped air inlet 12 is formed in the preheating box 10, a heat exchanger is arranged in the preheating box 10, the heat exchanger in the preheating box 10 is communicated with the heater 2 through a cooling gas output pipe 8, and a cooling medium output pipe is arranged on the heat exchanger in the preheating box 10; the preheated air outlet on the preheating box 10 is communicated with a preheating air duct 27, the output end of the preheating air duct 27 is connected with a reheating air duct 28 positioned at the bottom of the dryer, the output end of the reheating air duct 28 is communicated with a return air duct 29 between the outer box 4 and the outer cylinder 15 of the dryer, the top end of the return air duct 29 is communicated with a return air connecting pipe 30 positioned at the top of the dryer, the output end of the return air connecting pipe 30 is directly communicated with the heater 2, and the return air connecting pipe 30 and the input air duct 21 are respectively arranged at two sides of the heater 2.
In order to facilitate understanding of the work flow of the hot air circulation system of the dryer of the present invention, the flow path of the air of the hot air circulation system of the present invention will be described. Assuming that the dryer is in a normal working state at this time, the main fan 1 and the auxiliary fan 11 are both in a working state at this time, the input valve of the steam input pipe 6 on the heater 2 is in an open state, and the output valve on the cooling gas output pipe 8 is in an open state. The working process comprises the following steps:
firstly, drying linen with hot air. Hot steam supplied from the outside enters a pipeline of the heater 2 through the steam input pipe 6 and continuously exchanges heat with cold air from the return air duct, so that the cold air is rapidly heated to a temperature required by drying (different linen, different required temperatures), and meanwhile, the hot steam is condensed into high-temperature condensate water and flows into a heat exchanger of the preheating tank 10 through the cooling gas output pipe 8.
The main fan 1 sucks hot air from the input air duct 21 and blows the hot air to the inner cylinder 3 from the input air duct 22, in the process, the hot air blows the inner cylinder 3 along the inclined plane of the flow guide part of the wind shield 13 at a certain inclination angle and collides with the closed plane on the left side of the inner cylinder, and then blows the hot air reversely to the right lower side of the inner cylinder, so that the traveling distance of the hot air in the cylinder is increased, and the hot air is fully contacted with the to-be-dried linen in the cylinder.
The hot wind of the dryer inner cylinder is blown out from the round hole on the inner cylinder and is blown into the air transmission duct 24 through the collecting air duct 23, the hot wind blown out from the cylinder after the drying of the linen still has certain heat and carries some sundries such as fibers on the linen, the hot wind filtered by the filter screen 14 is blown out from the heat exchange exhaust pipe 5 in the heat exchange air duct 25, the auxiliary fan 11 extracts the wind in the heat exchange exhaust pipe of the heat exchange air duct and discharges the wind to the outside from the discharging air duct 26.
Secondly, primary heating by cold air. Cold air from the outside enters the preheating box through the mesh-shaped air inlet 12 of the preheating box 10 to exchange heat with a heat exchanger filled with high-temperature condensed water in the preheating box, so that the cold air from the outside is subjected to primary heating.
Thirdly, secondary heating by cold air. The primarily heated cold air is blown into the bottom of the dryer from the preheating air duct 27, traverses the reheating air duct 28 and passes through the gaps between the heat exchange exhaust pipes 5, at the moment, the primarily heated cold air and the hot air from the inner cylinder after being dried by the linen are subjected to heat exchange through the heat exchange exhaust pipes 5, and the cold air from the outside completes secondary heating.
Fourthly, circulating the hot air. The external cold air heated twice is continuously sucked from the input air duct 21 by the main fan, the secondarily heated cold air enters the return air connecting pipe 30 positioned at the top of the dryer from the bottom of the dryer through the return air duct 29, then the cold air heated twice in advance is heated again by the heater 2 to become hot air meeting the temperature required by drying, the hot air is blown into the inner cylinder of the dryer through the main fan, passes through the collecting air duct 23, the outgoing air duct 24 and the heat exchange air duct 25, and is finally discharged after passing through the discharging air duct 26, and the circulation of the hot air inside the dryer is completed.
As shown in the right half of fig. 4 (waste heat utilization), the method for recycling waste heat of a dryer of the present invention comprises the following steps:
(1) external cold air enters the preheating box 10 through the auxiliary fan, exchanges heat with a high-temperature condensate water heat exchanger therein, is primarily heated to form hot air, and enters the reheating air duct 28;
(2) the primary hot air entering the reheating air duct 28 exchanges heat with the heat exchange calandria 5 to form secondary hot air, and enters the return air connecting pipe 30 from the bottom of the dryer through the return air duct 29;
(3) the secondary hot air flows into the heater 2 through the return air connecting pipe 30 to be heated, and then is transmitted into the air duct 22 through the main fan and further enters the inner cylinder 3 to be dried and circulated;
(4) before the drying requirement of the linen is met, the system automatically repeats the steps (1) - (3);
as shown in the left part of fig. 4 (system operation flow), the operation control method of the hot air circulation system of the dryer of the present invention comprises the following steps:
step 1: system power-on
Step 2: starting the main fan 1 and the auxiliary fan 11;
and step 3: opening an input valve of the steam input pipe 6 and an output valve on the cooling gas output pipe 8;
and 4, step 4: the steam enters the pipeline of the heater 2 through the input pipe 6, exchanges heat with preheated air (cold air at the initial stage of system operation) from the return air duct 29, and the temperature of the steam is automatically controlled by the control system according to different drying objects; meanwhile, high-temperature condensate water formed by condensation of hot steam flows into the preheating tank 10 through the cooling gas output pipe 8;
and 5: under the action of the main fan 1, hot air flows to the inner barrel 3, contacts with the cloth grass in the barrel to be heated and dried, enters the heat exchange calandria 5 through the collecting air duct 23, the outgoing air duct 24 and the filter screen 14, is finally discharged through the discharging air duct 26, and the hot air circulation is finished;
step 6: repeating the step 4 and the step 5 until the linen meets the drying index requirement (automatic detection of the system and stop signal sent by the control system), and automatically closing the system, wherein the automatic closing of the system comprises closing of the main fan 1, the auxiliary fan 11, the input valve of the steam input pipe 6 and the output valve of the cooling gas output pipe 8;
and 7: and finishing the primary drying operation and stopping the machine.
The above-mentioned embodiments are merely illustrative of the principles and effects of the present invention, and some embodiments may be used, not restrictive; it should be noted that various changes and modifications can be made by those skilled in the art without departing from the inventive concept, and these changes and modifications fall within the scope of the invention.
Claims (7)
1. A hot air circulating system of a dryer comprises a heater arranged on an outer box of the dryer, wherein two interfaces are arranged on the heater and are respectively connected with a steam input pipe and a cooling gas output pipe, and an outlet of the heater is connected with an input air channel; the air intake and the input wind channel of main blower are connected, and the air outlet of main blower with spread into the wind channel and be connected, spread into the wind channel and set up the air intake intercommunication at inner tube terminal surface opening part on the drying-machine outer container, its characterized in that: a wind shield is arranged at an air inlet in the outer box of the dryer, and a flow guide part bent towards the opening of the end face of the inner cylinder is arranged on the wind shield; the surface of the inner cylinder of the dryer is distributed with a plurality of small holes, the bottom of the outer cylinder which wraps the inner cylinder and is close to the opening end is provided with a gap and is connected with a collecting air channel, and the other end of the collecting air channel is communicated with a spread air channel positioned at the bottom of the outer box of the dryer; the heat transfer air duct is communicated with a heat exchange air duct arranged in the outer box of the dryer, the heat exchange air duct is connected with a heat exchange calandria, the heat exchange calandria penetrates through a reheating air duct arranged in the outer box of the dryer, and the output end of the heat exchange calandria is communicated with the exhaust air duct;
a preheating box is arranged on the outer side of the outer box of the dryer, a net-shaped air inlet is formed in the preheating box, a heat exchanger is arranged in the preheating box, the heat exchanger in the preheating box is communicated with a heater through a cooling gas output pipe, and a cooling medium output pipe is arranged on the heat exchanger in the preheating box; the preheating air outlet on the preheating box is communicated with the preheating air duct, the output end of the preheating air duct is connected with the reheating air duct positioned at the bottom of the dryer, the output end of the reheating air duct is communicated with the return air duct, the top end of the return air duct is communicated with a return air connecting pipe positioned at the top of the dryer, the output end of the return air connecting pipe is directly communicated with the heater, and the return air connecting pipe and the input air duct are respectively arranged at two sides of the heater.
2. The hot air circulating system of the dryer as claimed in claim 1, wherein: and a filter screen is arranged between the air outlet duct and the heat exchange duct.
3. The hot air circulating system of the dryer as claimed in claim 1, wherein: the output end of the heat exchange calandria is communicated with the auxiliary fan, and the other end of the auxiliary fan is communicated with the exhaust air channel.
4. A hot air circulating system of a dryer according to any one of claims 1 to 3, wherein: the heat exchange air duct is arranged along the axial direction of the inner barrel.
5. A hot air circulating system of a dryer according to any one of claims 1 to 3, characterized in that: the return air duct is arranged between the outer box of the dryer and the outer cylinder.
6. A waste heat utilization method of a hot air circulating system of a dryer is characterized in that: the hot air circulating system of the dryer is the hot air circulating system of the dryer as claimed in any one of claims 1 to 5, and the waste heat utilization method specifically comprises the following steps:
(1) external cold air enters the preheating box through the auxiliary fan, exchanges heat with a high-temperature condensate water heat exchanger in the preheating box, is primarily heated to form hot air, and enters a hot air re-heating channel;
(2) the primary hot air entering the reheating air duct exchanges heat with the heat exchange calandria to form secondary hot air, and enters the return air connecting pipe from the bottom of the dryer through the return air duct;
(3) after secondary hot air flows into the heater through the air return connecting pipe for heating, the secondary hot air is introduced into the air channel through the main fan and further enters the inner cylinder for drying circulation;
(4) and (4) automatically repeating the steps (1) to (3) by the system until the linen meets the drying requirement.
7. An operation control method of a hot air circulating system of a dryer is characterized in that: the hot air circulating system of the dryer is the hot air circulating system of the dryer as claimed in any one of claims 1 to 5, and the operation control method comprises the following specific processes:
step 1: powering on a system;
step 2: starting a main fan and an auxiliary fan;
and step 3: opening an input valve of the steam input pipe and an output valve on the cooling gas output pipe;
and 4, step 4: the steam enters a pipeline of the heater through the input pipe, exchanges heat with the preheated air from the return air duct, and the temperature of the steam is automatically controlled by the control system according to different drying objects; meanwhile, high-temperature condensate water formed by condensation of hot steam flows into the preheating tank through the cooling gas output pipe;
and 5: under the action of a main fan, hot air flows to the inner barrel, contacts with the cloth grass in the barrel, is heated and dried, enters the heat exchange exhaust pipe through the collecting air duct, the outgoing air duct, the filter screen and finally is discharged through the discharging air duct, and hot air circulation is finished;
step 6: repeating the step 4 and the step 5 until the linen meets the drying index requirement, and executing system closing operation to close the main fan, the auxiliary fan, the input valve of the steam input pipe and the output valve of the cooling gas output pipe;
and 7: and finishing the primary drying operation and stopping the machine.
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Application publication date: 20220816 |