CN106524717B - Heat pump type fine dried noodle drying equipment and fine dried noodle drying method - Google Patents
Heat pump type fine dried noodle drying equipment and fine dried noodle drying method Download PDFInfo
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- CN106524717B CN106524717B CN201611142736.8A CN201611142736A CN106524717B CN 106524717 B CN106524717 B CN 106524717B CN 201611142736 A CN201611142736 A CN 201611142736A CN 106524717 B CN106524717 B CN 106524717B
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- 238000001035 drying Methods 0.000 title claims abstract description 115
- 235000012149 noodles Nutrition 0.000 title claims abstract description 81
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 151
- 239000002918 waste heat Substances 0.000 claims abstract description 49
- 238000011084 recovery Methods 0.000 claims abstract description 47
- 238000010438 heat treatment Methods 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 11
- 230000009471 action Effects 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 10
- 239000003507 refrigerant Substances 0.000 claims description 10
- 238000007664 blowing Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 5
- 239000000463 material Substances 0.000 description 7
- 239000000446 fuel Substances 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 239000002912 waste gas Substances 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000003034 coal gas Substances 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 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
- F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
- F26B15/10—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions
- F26B15/12—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined
- F26B15/122—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined the objects or batches of material being carried by transversely moving rollers or rods which may rotate
- F26B15/126—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined the objects or batches of material being carried by transversely moving rollers or rods which may rotate the material being "pasta" products, e.g. spaghetti
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- A—HUMAN NECESSITIES
- A21—BAKING; EDIBLE DOUGHS
- A21C—MACHINES OR EQUIPMENT FOR MAKING OR PROCESSING DOUGHS; HANDLING BAKED ARTICLES MADE FROM DOUGH
- A21C14/00—Machines or equipment for making or processing dough, not provided for in other groups of this subclass
-
- 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
-
- 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
-
- 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
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/001—Heating arrangements using waste heat
- F26B23/002—Heating arrangements using waste heat recovered from dryer exhaust gases
- F26B23/005—Heating arrangements using waste heat recovered from dryer exhaust gases using a closed cycle heat pump system ; using a heat pipe system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2210/00—Drying processes and machines for solid objects characterised by the specific requirements of the drying good
- F26B2210/06—Long pasta, e.g. spaghetti
-
- 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)
- Life Sciences & Earth Sciences (AREA)
- Food Science & Technology (AREA)
- Sustainable Development (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses heat pump type fine dried noodle drying equipment and a fine dried noodle drying method, wherein the heat pump type fine dried noodle drying equipment comprises a drying workshop and a heat pump system, a fine dried noodle conveying line is arranged at the bottom of the drying workshop, a water heating finned tube is arranged above the fine dried noodle conveying line, the water heating finned tube is connected with a circulating water return pipe and a circulating water supply pipe, and a ceiling fan is arranged above the water heating finned tube; the bottom of the drying workshop is provided with a moisture exhaust air inlet pipe, the middle part of the moisture exhaust air inlet pipe is connected with a moisture exhaust air outlet pipe, and the moisture exhaust air outlet pipe extends out of the drying workshop and is connected with a waste heat recovery chamber; evaporators of the heat pump systems are arranged in the waste heat recovery chamber at intervals side by side; one end of the waste heat recovery chamber is connected with an exhaust pipe, and the other end of the waste heat recovery chamber is connected with a moisture exhaust air outlet pipe. The invention is convenient for low-cost upgrading and reconstruction on the basis of the existing hot water type dried noodle drying equipment, can prevent the air temperature at the evaporator from being too low during starting, has no pollution in the operation process and high system energy efficiency, and has wide environmental adaptability.
Description
Technical Field
The invention relates to the technical field of heat pump drying, in particular to dried noodle drying equipment.
Background
At present, the known dried noodle drying equipment mainly uses coal and natural gas as fuels to provide a heat source, and smoke generated by fuel combustion (especially coal) is rich in a large amount of pollutants such as carbon monoxide, carbon dioxide and the like, thereby polluting the environment. With various national policies related to burning prohibition, fuel type drying equipment is gradually banned, and the heat pump drying technology which is more energy-saving and environment-friendly gradually enters the field of dried noodle drying.
At present, an air source heat pump is mostly adopted for drying fine dried noodles, heated air is sent into a drying workshop and is directly discharged in the form of waste gas after heat exchange with fine dried noodles, but the waste gas contains latent heat of steam and high-temperature sensible heat, so that a large amount of energy is wasted, and when the environment temperature is low, the air source heat pump is greatly influenced by the environment temperature and has low energy efficiency, and the air source heat pump is not beneficial to large-area application in China.
As is well known, heat pump drying equipment is special equipment for drying materials, a heat pump supplies heat for the drying equipment, air flow after temperature rise is sent to a drying workshop, and water vapor in the materials is taken away by the high-temperature dry air flow, so that the aim of drying is fulfilled. As the high-temperature airflow continuously takes away the water vapor, the temperature of the airflow is gradually reduced, the humidity is increased, and the dehydration capacity of the airflow on the materials is gradually reduced; and after the humidity of the air flow reaches a set humidity target, discharging a part of hot and humid air in the drying room, introducing the dry air in the environment, and continuing the dehydration and drying process. At present, heat pump equipment is limited by characteristics of a heat pump, the heating capacity and the energy efficiency ratio of the heat pump are low in low environmental temperature, and the application of the heat pump equipment in cold regions (such as northeast regions of China) is limited. Because the material drying process is not influenced by seasons and environment temperature, the drying process is required to be carried out all the year round, so when a heat pump is selected and matched, the heat pump is often matched according to the heat load at low environment temperature, at the moment, the selection and matching of heat pump equipment are very large, the initial investment of drying equipment is increased, the energy efficiency of the heat pump drying equipment at low environment temperature is lower, the energy-saving advantage is greatly weakened, and when the environment temperature is higher, the utilization rate of the heat pump equipment is very low. On the other hand, hot and humid air exhausted by the heat pump drying equipment cannot be effectively utilized, and most of heat is exhausted to the environment, so that waste of heat is caused.
At present, the known heat pump type fine dried noodle drying equipment mostly uses air as a heat transfer medium, and the heated air is put into a fine dried noodle drying room through an air duct system, which is called as hot air type fine dried noodle drying equipment; most of the fine dried noodle drying and baking rooms in the current market mostly adopt water as a heat transfer medium, which is called as hot water type fine dried noodle drying equipment; the hot water type dried noodle drying equipment is transformed into the hot air type dried noodle drying equipment, the pipeline needs to be laid again, and the transformation cost is too high. If a single-stage evaporator is adopted to recover the heat of the waste gas, when the temperature of the waste gas is higher, only a small part of heat in the waste gas can be recovered only through the primary evaporator cooling heat recovery, and most of heat is discharged, thereby still causing heat waste.
Disclosure of Invention
The invention aims to provide heat pump type noodle drying equipment which is convenient for low-cost upgrading and reconstruction on the basis of the existing hot water type noodle drying equipment, can prevent the air temperature at an evaporator from being too low during starting, has no pollution in the operation process and high system energy efficiency, and has wide environmental adaptability.
In order to achieve the purpose, the heat pump type fine dried noodle drying equipment comprises a drying workshop and a heat pump system, wherein a fine dried noodle conveying line used for hanging and conveying fine dried noodles is arranged at the bottom of the drying workshop, a water heating finned tube which is horizontally coiled is arranged above the fine dried noodle conveying line in the drying workshop, the water heating finned tube is connected with a circulating water return pipe and a circulating water supply pipe, a plurality of ceiling fans are uniformly arranged above the water heating finned tube at intervals along the length direction of the water heating finned tube, and each ceiling fan is connected to the top wall of the drying workshop; the top wall of each ceiling fan or the top of the side wall of each ceiling fan in the drying workshop is provided with a drying workshop air inlet communicated with the outside air;
a moisture-discharging air inlet pipe is arranged at the bottom of the drying workshop along the fine dried noodle conveying line, and a plurality of moisture-discharging air ports communicated with the drying workshop are uniformly arranged on the moisture-discharging air inlet pipe at intervals; the middle part of the moisture-removing air inlet pipe is connected with a moisture-removing air outlet pipe, and the moisture-removing air outlet pipe extends out of the drying workshop and is connected with a waste heat recovery chamber;
the heat pump system comprises a plate heat exchanger, a compressor, an expansion valve and an evaporator which are in circulating connection through a refrigerant pipeline, the plate heat exchanger is used as a condenser in the heat pump system and is connected to the refrigerant pipeline between the compressor and the expansion valve, and a shell of the plate heat exchanger is provided with a circulating water inlet and a circulating water outlet; more than two sets of heat pump systems are arranged;
the plate heat exchangers of each heat pump system are arranged in a press chamber at intervals side by side, the flowing direction of circulating water is taken as the front direction, and in two adjacent plate heat exchangers, the circulating water outlet of the plate heat exchanger positioned at the rear is connected with the circulating water inlet of the plate heat exchanger positioned at the front through a hot water pipeline; the circulating water inlet of the rearmost plate heat exchanger is connected with the circulating water return pipe, the circulating water outlet of the foremost plate heat exchanger is connected with the circulating water supply pipe, and a circulating pump is arranged on the circulating water supply pipe; the water inlet of the water heating finned tube is connected with a circulating water supply pipe, and the water outlet of the water heating finned tube is connected with a circulating water return pipe;
the waste heat recovery chamber is in a long-strip cylindrical shape, and evaporators of the heat pump systems are arranged in the waste heat recovery chamber side by side at intervals; the waste heat recovery chambers behind and in front of the evaporators are provided with cavity sections by taking the airflow direction as the front direction; the direction of the airflow is taken as the front direction, the waste heat recovery chamber is provided with N evaporators and N +1 cavity sections at intervals from front to back, and N is a natural number; from front to back, the foremost cavity section is the first cavity section, and the second to Nth cavity sections are arranged backwards in sequence; starting from the third cavity section from front to back, the side walls of the third cavity section and all odd-number cavity sections behind the third cavity section are connected with a starting fan, and the air inlet of each starting fan is provided with a first air valve for connecting the starting fan and the cavity section; from the front to the back of the second cavity section, the second cavity section and all the even-number-position cavity sections behind the second cavity section are provided with second air valves for communicating the cavity sections with the atmosphere;
the circumferential outer walls of the evaporators are connected with the inner wall of the waste heat recovery chamber, one end of the waste heat recovery chamber is connected with an exhaust pipe, and the other end of the waste heat recovery chamber is connected with the moisture-removing air-out pipe; the exhaust pipe is provided with a working fan for pumping gas out of the waste heat recovery chamber.
A water tank is arranged on a circulating water supply pipe at the water inlet of the circulating pump, and the circulating water supply pipe is communicated with the bottom of the water tank; a pressure gauge is arranged on the water tank, and a temperature sensor for monitoring the temperature of the dehumidifying air is arranged on the dehumidifying air outlet pipe; the bottom of the waste heat recovery chamber is connected with a condensed water discharge pipe.
The invention also aims to provide a method for drying the fine dried noodles by using the heat pump type fine dried noodle drying equipment. The method comprises the following steps in sequence:
the first step is a start-up step; opening the first air valve and each second air valve, and then opening the working fan and each starting fan; then starting a circulating pump, turning on each ceiling fan, and turning on a corresponding number of heat pump systems according to the actual working load; at the moment, outside air at each second air valve is sucked into the cavity section through the second air valve to form air flow, and the air flow in the cavity section flows towards two sides and passes through an evaporator respectively and then is discharged through the first air valve and the starting fan; at the moment, negative pressure formed by the working fan and the starting fan acts in the drying workshop through the moisture-removing air outlet pipe and the moisture-removing air inlet pipe, outside air enters the drying workshop from air inlets of the drying workshop, and moisture-removing air is formed in the moisture-removing air outlet pipe and the moisture-removing air inlet pipe under the blowing action of each ceiling fan and the suction action of the working fan and the starting fan; the circulating pump drives circulating water to circularly flow among the plate heat exchanger, the hot water pipeline, the circulating water supply pipe, the water heating finned tube and the circulating water return pipe, so that heat in the plate heat exchanger is brought to the water heating finned tube, and further, air flow blown downwards by the ceiling fan is heated;
the second step is to enter normal operation; after the first step is operated for a period of time, after the temperature of the exhausted wet air reaches a preset range, closing and starting the fan, the first air valve and each second air valve; at the moment, under the suction action of the working fan and the blowing action of each ceiling fan, outside air enters the drying workshop from an air inlet of the drying workshop, and is heated to form hot air when passing through the water heating finned tube; when the hot air passes through the fine dried noodle conveying line, fine dried noodles hung on the fine dried noodle conveying line are heated, and moisture evaporated from the fine dried noodles is mixed with the hot air to form exhaust moisture air; the exhaust wet air enters the exhaust wet air inlet pipe through the exhaust wet air port and enters the waste heat recovery chamber along the exhaust wet air outlet pipe, and in the waste heat recovery chamber, the exhaust wet air is discharged into the environment through the working fan after passing through each evaporator in turn; the heat pump system continuously radiates cold energy to the waste heat recovery chamber and is taken away by the exhaust wet air through the operation of the compressor, and simultaneously continuously sends the heat energy to the plate heat exchanger and is taken to a drying workshop by the circulating water; the heat pump system, the circulating pump, the working fan, the ceiling fans and the fine dried noodle conveying line work simultaneously to form a stable normal working state, and fine dried noodles to be dried continuously pass through the drying workshop along with the fine dried noodle conveying line and are dried;
the third step is a shutdown step; when the drying of the fine dried noodles needs to be stopped or the machine needs to be stopped for maintenance, the heat pump system, the circulating pump, the working fan, the ceiling fans and the fine dried noodle conveying line are closed, and the system stops running.
The invention has the following advantages:
the invention has no chemical combustion process in the operation process, and all devices in the invention, no matter the heat pump system (compressor), the circulating pump, all ceiling fans, the working fan and the starting fan, are all driven by electric power, so the invention does not pollute the use environment in the operation process.
In the invention, the evaporators of the heat pump systems are arranged in the waste heat recovery chamber side by side at intervals so as to be arranged on the wind path of hot air in series, and the hot air in the moisture exhaust air outlet pipe sequentially passes through the evaporators so as to lower the temperature of the hot air step by step.
The existing fine dried noodle drying workshops mostly adopt water as a heat transfer medium, namely hot water type fine dried noodle drying equipment, most of the existing equipment takes coal and natural gas as fuels, heat energy is provided by combustion of combustion equipment, the pollution is high when the coal is taken as the fuel, and the cost is high when the natural gas is taken as the fuel. The structure of the invention is very convenient for reconstruction on the basis of the existing hot water type dried noodle drying equipment, when in reconstruction, the plate heat exchanger in the heat pump system is connected with the circulating water return pipe and the circulating water supply pipe of the existing hot water type dried noodle drying equipment, and then the dehumidifying air inlet pipe is arranged at the bottom of the drying workshop.
When the system starts to operate, the temperature of hot water is not increased yet, so that the air temperature is low, and at the moment, when air with low temperature passes through each evaporator in sequence, because each evaporator is arranged in series relative to an air path, the same path of air (the capacity for absorbing cold energy is limited) needs to absorb the cold energy emitted by each evaporator in sequence, so that the cold load emitted by the evaporators cannot be effectively absorbed actually, the temperature at the evaporators is too low, the frosting phenomenon is generated on the evaporators, and the evaporators are further prevented from emitting the cold energy outwards. Under the condition, the operation efficiency of the heat pump system is greatly reduced, the energy consumption is increased, the circulating water temperature and the air temperature can not reach the expected temperature value all the time, the fine dried noodles can not be effectively dried, and a vicious circle of low air temperature, frosting, heat pump system efficiency reduction, no air temperature removal and further frosting is formed at the evaporator.
The vicious circle can be broken by starting the fan and setting each air valve. When the system starts to operate, the first air valve and the second air valves are opened, and the working fan and the starting fan are simultaneously opened, so that outside air can be sucked in through the second air valves, and the second air valves and the starting fan are arranged, so that one of two cavity sections at two sides of each evaporator is provided with the second air valve communicated with the outside air, and the other cavity section is provided with the fan for air suction, so that air is sucked in by each second air valve and can be sucked out by the working fan or the second fan only after passing through the primary evaporator, and therefore, each path of air entering the waste heat recovery chamber through the second air valve only needs to absorb the cold of one evaporator (the evaporators are in a parallel state relative to multiple paths of air), the cold emitted by the evaporators can be fully absorbed, the phenomenon of frost at the evaporators is avoided, the evaporation temperature is not too low, and prevent the evaporator from frosting and reducing the heat exchange efficiency of the evaporator, thereby avoiding the phenomenon of vicious circle.
Because the temperature of the evaporator can be increased by hot air (dehumidifying air), the working condition of the evaporator can be improved, and the energy efficiency ratio of the heat pump system is improved.
Specifically, when the temperature at the evaporator is increased, the evaporation temperature of the heat pump system is increased, the heating capacity of the heat pump system is increased, and the power of the compressor is reduced, thereby improving the energy efficiency ratio of the heat pump system.
According to the invention, the heat pump system is used as a heat source, heat is transferred to circulating water through the plate heat exchanger, fresh air is heated through the circulating water, and heated hot air is used for drying materials in a drying workshop, so that the heat pump system is more energy-saving and environment-friendly compared with a mode of heating air by using coal or gas; compared with a common heat pump system, the waste heat utilization device can fully utilize the energy of hot air, greatly improve the efficiency of the heat pump system and achieve the purpose of saving energy.
The invention furthest recovers the waste heat (heat) in the exhaust wet air, improves the working condition of the evaporator, greatly reduces the power consumption of the heat pump system (compressor), has very obvious effects of saving energy and reducing consumption, and reduces the use cost of the heat pump system.
The fresh air reduces the humidity in the drying workshop, and by adopting the invention, the materials can be rapidly dried by the heated fresh air, and the heat pump system is very energy-saving, so that the invention has the functions of rapidly drying the materials, and has the advantages of energy conservation, consumption reduction and no pollution, and has good popularization and application prospects.
At present, heat pump equipment is limited by characteristics of a heat pump, the heating capacity and the energy efficiency ratio of the heat pump are low in low environmental temperature, and the application of the heat pump equipment in cold regions (such as northeast regions of China) is limited. The invention only uses the environment gas to absorb the cold energy emitted by the evaporator when the evaporator is started initially, and the exhaust wet air with higher temperature is always used to absorb the cold energy emitted by the evaporator in the normal operation process, so that the influence of the environment temperature on the operation efficiency of the heat pump system is small when the heat pump system is operated normally, the heat pump system has wider adaptability compared with the normal heat pump system, can still keep higher energy efficiency ratio in colder areas, and has wide environmental adaptability.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic diagram of a heat pump system according to the present invention.
Detailed Description
The direction of the arrows in fig. 1 and 2 is the direction of flow (motion) of the moving objects (water or air or refrigerant or liner).
As shown in fig. 1 and 2, the heat pump type fine dried noodle drying device comprises a drying workshop 1 and a heat pump system, wherein a fine dried noodle conveying line 3 for hanging and conveying fine dried noodles 2 is arranged at the bottom of the drying workshop 1, a water heating finned tube 4 which is horizontally coiled is arranged above the fine dried noodle conveying line 3 in the drying workshop 1 along the length direction of the fine dried noodle conveying line 3, the water heating finned tube 4 is connected with a circulating water return pipe 5 and a circulating water supply pipe 6, a plurality of ceiling fans 7 are uniformly arranged above the water heating finned tube 4 along the length direction of the water heating finned tube 4 at intervals, and each ceiling fan 7 is connected to the top wall of the drying workshop 1; the top of the top wall of the drying workshop at each ceiling fan 7 or the top of the side wall of the drying workshop at each ceiling fan 7 of the drying workshop 1 is provided with an air inlet of the drying workshop 1 communicated with the outside air; it is conventional in the art to provide air inlets in the top wall or side walls of a drying room or other building, the air inlets of the drying room 1 not being shown.
A moisture-discharging air inlet pipe 8 is arranged at the bottom of the drying workshop 1 along the length direction of the fine dried noodle conveying line 3, and a plurality of moisture-discharging air ports 9 communicated with the drying workshop 1 are uniformly arranged on the moisture-discharging air inlet pipe 8 at intervals; the middle part of the moisture-removing air inlet pipe 8 is connected with a moisture-removing air outlet pipe 10, and the moisture-removing air outlet pipe 10 extends upwards out of the drying workshop 1 and is connected with a waste heat recovery chamber 11;
the heat pump system comprises a plate heat exchanger 12, a compressor 13, an expansion valve 14 and an evaporator 15 which are circularly connected through a refrigerant pipeline 28, wherein the plate heat exchanger is used as a condenser in the heat pump system and is connected on the refrigerant pipeline 28 between the compressor 13 and the expansion valve 14, and a shell of the plate heat exchanger 12 is provided with a circulating water inlet 17 and a circulating water outlet 18; the heat pump system is provided with more than two sets;
the plate heat exchangers 12 of each heat pump system are arranged in a press chamber at intervals side by side, the flow direction of circulating water is taken as the front direction, and the circulating water outlet 18 of one plate heat exchanger 12 positioned at the rear in two adjacent plate heat exchangers 12 is connected with the circulating water inlet 17 of one plate heat exchanger 12 positioned at the front through a hot water pipeline 29; a circulating water inlet 17 of the rearmost plate heat exchanger 12 is connected with the circulating water return pipe 5, a circulating water outlet 18 of the frontmost plate heat exchanger 12 is connected with the circulating water supply pipe 6, and a circulating pump 19 is arranged on the circulating water supply pipe 6; the water inlet of the water heating finned tube 4 is connected with a circulating water supply pipe 6, and the water outlet of the water heating finned tube 4 is connected with a circulating water return pipe 5;
the waste heat recovery chamber 11 is in a long-strip cylindrical shape, and the evaporators 15 of the heat pump systems are arranged in the waste heat recovery chamber 11 side by side at intervals; the waste heat recovery chambers 11 behind and in front of each evaporator 15 are provided with cavity sections 20 with the airflow direction as the front direction; with the direction of the airflow as the front direction, the waste heat recovery chamber 11 is provided with N evaporators 15 and N +1 cavity sections 20 at intervals from the front to the back, wherein N is a natural number; from front to back, the foremost cavity section 20 is the first cavity section 20, and the second to Nth cavity sections 20 are arranged backwards in sequence; starting from the third cavity section 20 from front to back, the side walls of the third cavity section 20 and all odd-number cavity sections 20 behind the third cavity section are connected with a starting fan 21, and a first air valve 22 for connecting the starting fan 21 and the cavity sections 20 is arranged at an air inlet of each starting fan 21; from the front to the back of the second cavity section 20, the second cavity section 20 and all the even-number cavity sections 20 behind the second cavity section 20 are provided with second air valves 23 for communicating the cavity section 20 with the atmosphere;
the circumferential outer walls of the evaporators 15 are connected to the inner wall of the waste heat recovery chamber 11, thereby ensuring that the air passes through the evaporators entirely without bypassing the evaporators 15. One end of the waste heat recovery chamber 11 is connected with an exhaust pipe 24, and the other end of the waste heat recovery chamber is connected with the moisture-removing air-out pipe 10; the exhaust duct 24 is provided with a work fan 25 for drawing air out of the waste heat recovery chamber 11.
A water tank 26 is arranged on the circulating water supply pipe 6 at the water inlet of the circulating pump 19, and the circulating water supply pipe 6 is communicated with the bottom of the water tank 26; a pressure gauge is arranged on the water tank 26, and a temperature sensor for monitoring the temperature of the dehumidifying air is arranged on the dehumidifying air outlet pipe 10. Both the pressure gauge and the temperature sensor are conventional components, not shown.
Because the water tank 26 can have a certain liquid level, the circulating pump 19 can be ensured to be completely water pumped out from the bottom of the water tank 26 and not contain gas, so that the liquid impact phenomenon can be prevented, and the stable operation of the system can be ensured. Of course, the arrangement of the water tank 26 and the pressure gauge is also convenient for observing the water pressure in the system, and ensuring that the water quantity in the system is sufficient. A condensed water discharge pipe 27 is connected to the bottom of the waste heat recovery chamber 11, and the condensed water discharge pipe 27 can discharge condensed water condensed by hot and humid air (humid air) in operation at the evaporator 15.
Wherein, the vermicelli transfer chain 3, hot-water heating finned tube 4, ceiling fan 7, each part of heat pump system, circulating pump 19, work fan 25 and start-up fan 21 etc. are prior art, and concrete structure no longer details.
The invention also discloses a method for drying fine dried noodles by using the heat pump type fine dried noodle drying equipment, which comprises the following steps in sequence:
the first step is a start-up step; the first air valve 22 and each second air valve 23 are opened, and then the working fan 25 and each starting fan 21 are opened; then, starting a circulating pump 19, turning on each ceiling fan 7, and turning on a corresponding number of heat pump systems (namely starting a corresponding number of compressors 13 of the heat pump systems) according to the actual workload (the actual workload is determined by the number of the dried noodles to be dried and the running speed of the dried noodle conveying line 3); at this time, the outside air at each second air valve 23 is sucked into the cavity section 20 through the second air valve 23 to form an air flow, and the air flow in the cavity section 20 flows to both sides and passes through one evaporator 15 respectively, and then is discharged through the first air valve 22 and the start fan 21; in this way, the airflow only needs to be discharged through the first-stage evaporator 15, and only needs to absorb the cold energy emitted by one evaporator 15, so that the adverse conditions such as frosting of the evaporator 15 caused by the airflow sequentially passing through the evaporators 15 of different stages in series can be prevented. At the moment, the negative pressure formed by the working fan 25 and the starting fan 21 acts on the drying workshops 1 through the moisture-removing air outlet pipe 10 and the moisture-removing air inlet pipe 8, the outside air enters the drying workshops 1 from the air inlets of the drying workshops 1, and moisture-removing air is formed in the moisture-removing air outlet pipe 10 and the moisture-removing air inlet pipe 8 under the blowing action of the ceiling fans 7 and the suction action of the working fan 25 and the starting fan 21; the circulating pump 19 drives circulating water to circularly flow among the plate heat exchanger 12, the hot water pipeline 29, the circulating water supply pipe 6, the water heating finned tube 4 and the circulating water return pipe 5, so that heat in the plate heat exchanger 12 is brought to the water heating finned tube 4, and further air flow blown downwards by the ceiling fan 7 is heated;
the second step is to enter normal operation; after the first step is operated for a period of time, after the temperature of the discharged wet air reaches a preset range (the temperature range of the discharged wet air is determined according to the number, the speed, the preset drying degree and the like of the actual dried noodles, which is the routine ability of the person skilled in the art, and no specific temperature value is given here), the starting fan 21, the first air valve 22 and each second air valve 23 are closed; at the moment, under the suction action of the working fan 25 and the blowing action of each ceiling fan 7, outside air enters the drying workshop 1 from an air inlet of the drying workshop 1 and is heated to form hot air when passing through the water heating finned tube 4; when the hot air passes through the fine dried noodle conveying line 3, fine dried noodles hung on the fine dried noodle conveying line 3 are heated, and moisture evaporated from the fine dried noodles is mixed with the hot air to form exhaust moisture; the moisture-removing air enters a moisture-removing air inlet pipe 8 through a moisture-removing air inlet 9 and enters a waste heat recovery chamber 11 along a moisture-removing air outlet pipe 10, and in the waste heat recovery chamber 11, the moisture-removing air passes through each evaporator 15 in sequence and then is discharged into the environment through a working fan 25; the heat pump system continuously radiates cold energy to the waste heat recovery chamber 11 and is taken away by the exhaust wet air through the operation of the compressor 13, and simultaneously continuously sends the heat energy to the plate heat exchanger 12 and is taken to the drying workshop 1 by the circulating water;
the temperature is lowered when the moisture-removing wind absorbs the cold of the evaporator, and the water vapor contained therein is condensed into water and then discharged out of the waste heat recovery chamber through the condensed water discharge pipe 27.
The heat pump system, the circulating pump 19, the working fan 25, the ceiling fans 7 and the fine dried noodle conveying lines 3 work simultaneously to form a stable normal working state, and fine dried noodles to be dried continuously pass through the drying workshop 1 along with the fine dried noodle conveying lines 3 and are dried;
the third step is a shutdown step; when the drying of the fine dried noodles needs to be stopped or the machine needs to be stopped for maintenance, the heat pump system, the circulating pump 19, the working fan 25, the ceiling fans 7 and the fine dried noodle conveying line 3 are closed, and the system stops running.
In the invention, the switches of all the components are preferably automatically controlled by an electric control device and can also be manually operated.
When the working condition is not good, for example, when the heat exchange efficiency of the evaporator 15 is low, the cold energy of the evaporator 15 cannot be effectively dissipated outwards, so that the refrigerant in the evaporator 15 is maintained at a low temperature. As is well known to those skilled in the art, the temperature of the refrigerant has a positive correlation with the pressure, and when the temperature of the refrigerant is lower, the pressure is also lower; the pressure at the suction port of the compressor 13 is lower than the pressure at the discharge port of the compressor 13. Therefore, when the evaporator 15 is in a bad operation, the pressure difference between the suction port and the discharge port of the compressor 13 is large, and the power of the compressor 13 is increased, which consumes much power.
In the invention, the plate heat exchanger serves as a condenser in the heat pump system to provide heat for the circulating hot water. Other heat exchangers (shell-and-tube heat exchangers, double-tube heat exchangers, etc.) capable of raising the temperature of hot water are equivalent alternatives and are within the scope of the claims of the present invention.
In the invention, the working condition of the evaporator 15 in the heat pump system is improved and the pressure of the air suction port of the compressor 13 is increased by enabling the evaporator 15 to absorb waste heat in the exhaust wet air. The pressure difference between the air suction port and the air exhaust port of the compressor 13 is small, so that the actual power of the compressor 13 is greatly reduced, and the energy is greatly saved.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention any modifications and equivalents.
Claims (1)
1. A method for drying fine dried noodles by using heat pump type fine dried noodle drying equipment,
the heat pump type fine dried noodle drying equipment comprises a drying workshop and a heat pump system, wherein a fine dried noodle conveying line used for hanging and conveying fine dried noodles is arranged at the bottom of the drying workshop, a water heating finned tube horizontally coiled is arranged above the fine dried noodle conveying line in the drying workshop, the water heating finned tube is connected with a circulating water return tube and a circulating water supply tube, a plurality of ceiling fans are uniformly arranged above the water heating finned tube at intervals along the length direction of the water heating finned tube, and each ceiling fan is connected to the top wall of the drying workshop; the top wall of each ceiling fan or the top of the side wall of each ceiling fan in the drying workshop is provided with a drying workshop air inlet communicated with the outside air;
the method is characterized in that:
a moisture-discharging air inlet pipe is arranged at the bottom of the drying workshop along the fine dried noodle conveying line, and a plurality of moisture-discharging air ports communicated with the drying workshop are uniformly arranged on the moisture-discharging air inlet pipe at intervals; the middle part of the moisture exhaust air inlet pipe is connected with a moisture exhaust air outlet pipe, and the moisture exhaust air outlet pipe extends out of the drying workshop and is connected with a waste heat recovery chamber;
the heat pump system comprises a plate heat exchanger, a compressor, an expansion valve and an evaporator which are in circulating connection through a refrigerant pipeline, the plate heat exchanger is used as a condenser in the heat pump system and is connected to the refrigerant pipeline between the compressor and the expansion valve, and a shell of the plate heat exchanger is provided with a circulating water inlet and a circulating water outlet; more than two sets of heat pump systems are arranged;
the plate heat exchangers of each heat pump system are arranged in a press chamber at intervals side by side, the flowing direction of circulating water is taken as the front direction, and in two adjacent plate heat exchangers, the circulating water outlet of the plate heat exchanger positioned at the rear is connected with the circulating water inlet of the plate heat exchanger positioned at the front through a hot water pipeline; the circulating water inlet of the rearmost plate heat exchanger is connected with the circulating water return pipe, the circulating water outlet of the foremost plate heat exchanger is connected with the circulating water supply pipe, and a circulating pump is arranged on the circulating water supply pipe; the water inlet of the water heating finned tube is connected with a circulating water supply pipe, and the water outlet of the water heating finned tube is connected with a circulating water return pipe;
the waste heat recovery chamber is in a long-strip cylindrical shape, and the evaporators of the heat pump systems are arranged in the waste heat recovery chamber at intervals side by side; the waste heat recovery chambers behind and in front of the evaporators are provided with cavity sections by taking the airflow direction as the front direction; the direction of the airflow is taken as the front direction, the waste heat recovery chamber is provided with N evaporators and N +1 cavity sections at intervals from front to back, and N is a natural number; from front to back, the foremost cavity section is the first cavity section, and the second to Nth cavity sections are arranged backwards in sequence; starting from the third cavity section from front to back, the side walls of the third cavity section and all odd-number cavity sections behind the third cavity section are connected with a starting fan, and the air inlet of each starting fan is provided with a first air valve for connecting the starting fan and the cavity section; from the front to the back of the second cavity section, the second cavity section and all the even-number-position cavity sections behind the second cavity section are provided with second air valves for communicating the cavity sections with the atmosphere;
the circumferential outer walls of the evaporators are connected with the inner wall of the waste heat recovery chamber, one end of the waste heat recovery chamber is connected with an exhaust pipe, and the other end of the waste heat recovery chamber is connected with the moisture-removing air-out pipe; the exhaust pipe is provided with a working fan for pumping gas out of the waste heat recovery chamber;
a water tank is arranged on a circulating water supply pipe at the water inlet of the circulating pump, and the circulating water supply pipe is communicated with the bottom of the water tank; a pressure gauge is arranged on the water tank, and a temperature sensor for monitoring the temperature of the dehumidifying air is arranged on the dehumidifying air outlet pipe; the bottom of the waste heat recovery chamber is connected with a condensed water discharge pipe;
the method comprises the following steps of:
the first step is a start-up step; opening the first air valve and each second air valve, and then opening the working fan and each starting fan; then starting a circulating pump, turning on each ceiling fan, and turning on a corresponding number of heat pump systems according to the actual working load; at the moment, outside air at each second air valve is sucked into the cavity section through the second air valve to form air flow, and the air flow in the cavity section flows towards two sides and passes through an evaporator respectively and then is discharged through the first air valve and the starting fan; at the moment, negative pressure formed by the working fan and the starting fan acts in the drying workshop through the moisture-removing air outlet pipe and the moisture-removing air inlet pipe, outside air enters the drying workshop from air inlets of the drying workshop, and moisture-removing air is formed in the moisture-removing air outlet pipe and the moisture-removing air inlet pipe under the blowing action of each ceiling fan and the suction action of the working fan and the starting fan; the circulating pump drives circulating water to circularly flow among the plate heat exchanger, the hot water pipeline, the circulating water supply pipe, the water heating finned tube and the circulating water return pipe, so that heat in the plate heat exchanger is brought to the water heating finned tube, and further, air flow blown downwards by the ceiling fan is heated;
the second step is to enter normal operation; after the first step is operated for a period of time, after the temperature of the exhausted wet air reaches a preset range, closing and starting the fan, the first air valve and each second air valve; at the moment, under the suction action of the working fan and the blowing action of each ceiling fan, outside air enters the drying workshop from an air inlet of the drying workshop, and is heated to form hot air when passing through the water heating finned tube; when the hot air passes through the fine dried noodle conveying line, fine dried noodles hung on the fine dried noodle conveying line are heated, and moisture evaporated from the fine dried noodles is mixed with the hot air to form exhaust moisture air; the exhaust wet air enters the exhaust wet air inlet pipe through the exhaust wet air port and enters the waste heat recovery chamber along the exhaust wet air outlet pipe, and in the waste heat recovery chamber, the exhaust wet air is discharged into the environment through the working fan after passing through each evaporator in sequence; the heat pump system continuously radiates cold energy to the waste heat recovery chamber and is taken away by the moisture exhaust air through the operation of the compressor, and simultaneously continuously sends heat energy to the plate heat exchanger and is taken to a drying workshop by the circulating water; the heat pump system, the circulating pump, the working fan, the ceiling fans and the fine dried noodle conveying line work simultaneously to form a stable normal working state, and fine dried noodles to be dried continuously pass through the drying workshop along with the fine dried noodle conveying line and are dried;
the third step is a shutdown step; when the drying of the fine dried noodles needs to be stopped or the machine needs to be stopped for maintenance, the heat pump system, the circulating pump, the working fan, the ceiling fans and the fine dried noodle conveying line are closed, and the system stops running.
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| CN107314623B (en) * | 2017-08-03 | 2023-04-25 | 湄潭县君梦食品有限公司 | Fine dried noodle drying device |
| CN108036626A (en) * | 2018-01-13 | 2018-05-15 | 张培森 | A kind of concentration hydrofuge, the furnace drying method and its equipment of hot wind whole recycling |
| CN109059494B (en) * | 2018-06-11 | 2020-11-06 | 上海京元食品有限公司 | A drying system for noodles |
| CN108935880A (en) * | 2018-08-28 | 2018-12-07 | 贵州宏财聚农投资有限责任公司 | A kind of Rosa roxburghii Tratt preserved fruit production equipment |
| CN111551004A (en) * | 2020-06-16 | 2020-08-18 | 河南海弗星换热科技有限公司 | Waste heat recycling heat pump fine dried noodle drying comprehensive energy-saving system |
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