CN113654372B - Waste heat recovery system and process of setting machine - Google Patents
Waste heat recovery system and process of setting machine Download PDFInfo
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- CN113654372B CN113654372B CN202110932871.7A CN202110932871A CN113654372B CN 113654372 B CN113654372 B CN 113654372B CN 202110932871 A CN202110932871 A CN 202110932871A CN 113654372 B CN113654372 B CN 113654372B
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- 238000011084 recovery Methods 0.000 title claims abstract description 197
- 239000002918 waste heat Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title abstract description 7
- 238000009833 condensation Methods 0.000 claims abstract description 155
- 230000005494 condensation Effects 0.000 claims abstract description 155
- 239000002912 waste gas Substances 0.000 claims abstract description 84
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 239000007789 gas Substances 0.000 claims description 24
- 238000005057 refrigeration Methods 0.000 claims description 24
- 239000003507 refrigerant Substances 0.000 claims description 19
- 239000000779 smoke Substances 0.000 claims description 19
- 238000003860 storage Methods 0.000 claims description 16
- 239000007921 spray Substances 0.000 claims description 15
- 238000004064 recycling Methods 0.000 claims description 12
- 238000001179 sorption measurement Methods 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000011282 treatment Methods 0.000 abstract description 4
- 239000003570 air Substances 0.000 description 34
- 238000005507 spraying Methods 0.000 description 23
- 239000012080 ambient air Substances 0.000 description 6
- 238000012546 transfer Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 239000004744 fabric Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000013618 particulate matter Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 238000004043 dyeing Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000007730 finishing process Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000006233 lamp black Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 206010000369 Accident Diseases 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- 150000001491 aromatic compounds Chemical class 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 150000002391 heterocyclic compounds Chemical class 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 150000002596 lactones Chemical class 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B7/00—Combinations of two or more condensers, e.g. provision of reserve condenser
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
- D06C7/00—Heating or cooling textile fabrics
- D06C7/02—Setting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B27/00—Machines, plants or systems, using particular sources of energy
- F25B27/02—Machines, plants or systems, using particular sources of energy using waste heat, e.g. from internal-combustion engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B11/00—Controlling arrangements with features specially adapted for condensers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/01—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using means for separating solid materials from heat-exchange fluids, e.g. filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F25/00—Component parts of trickle coolers
- F28F25/02—Component parts of trickle coolers for distributing, circulating, and accumulating liquid
- F28F25/06—Spray nozzles or spray pipes
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Textile Engineering (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The application relates to a waste heat recovery system and process of a setting machine. The waste heat recovery system comprises a first condensation recovery component and a second condensation recovery component which are sequentially arranged at the downstream of the setting machine, a refrigerating component is arranged between a heat exchange inlet pipe of the first condensation recovery component and a heat exchange inlet pipe of the second condensation recovery component, and a heat exchange outlet pipe of the first condensation recovery component and the setting machine are connected with a hot air conversion component. The waste heat recovery efficiency and the utilization rate of the setting machine can be remarkably improved, and meanwhile, waste gas is subjected to clean treatment, so that the production process is more energy-saving and more environment-friendly.
Description
Technical Field
The application relates to a waste heat recovery system and process of a setting machine, which are applicable to the technical field of energy conservation and environmental protection.
Background
The high temperature setting machine in the printing and dyeing industry can generate lampblack containing organic matters and fuel auxiliary agents in the operation process, the main components of the lampblack comprise aldehyde, ketone, hydrocarbon, fatty acid, alcohol, ester, lactone, heterocyclic compounds, aromatic compounds and the like, and particularly, the components of the dye auxiliary agents are more complex in the after-finishing process of functional fabrics such as water resistance, flame retardance and the like when the yarn is added with lubricants in the manufacturing process. Meanwhile, after certain cloth is shaped at high temperature, a large amount of fibers in the cloth can enter waste gas, so that the waste gas of the high-temperature shaping machine contains a large amount of oil smoke and solid particles, and can cause great pollution to the environment. The existence of the substances can easily cause potential safety hazards such as firing of the setting machine.
On the other hand, the setting machine is also equipment with the largest energy consumption of a single machine in the dyeing and finishing process, and a large amount of hot air is consumed during operation, however, the effective heat energy during the processing and setting of the fabric is only about 30% of the total heating quantity, the heat dissipation loss is as high as 70%, wherein the waste gas emission loss heat accounts for about 60%, and the heat dissipation capacity of equipment, wall surfaces and the like accounts for about 10%. If the heat in the part of the waste gas is recovered and reused for operation, the waste of the heat is greatly reduced, and the energy utilization efficiency is improved.
Therefore, how to design a high-efficiency energy-saving waste heat recovery technology and further improve the treatment quality of waste gas becomes a technical problem to be solved in the setting machine industry.
Disclosure of Invention
The application provides a waste heat recovery system and process of forming machine, is showing and has improved forming machine waste heat recovery's efficiency and utilization ratio, has improved waste heat recovery's economic value, has carried out clean processing simultaneously to waste gas for the production process is more energy-conserving, more environmental protection.
An aspect of the application relates to a waste heat recovery system of forming machine, including setting gradually first condensation recovery unit and the second condensation recovery unit in the forming machine low reaches, first condensation recovery unit's heat transfer advance the pipe with be equipped with refrigeration unit between the heat transfer advance pipe of second condensation recovery unit, first condensation recovery unit's heat transfer exit tube with be connected with hot-blast conversion component between the forming machine.
The refrigerating assembly comprises an evaporator and a condenser, a heat exchange medium is pumped to a heat exchanger inlet of the first condensation recovery assembly through a first pump, is pumped to a heat exchanger inlet of the second condensation recovery assembly through a second pump, the evaporator is arranged on a pipeline connected with the heat exchanger inlet of the second condensation recovery assembly, the condenser is arranged on the pipeline connected with the heat exchanger inlet of the first condensation recovery assembly, and a heat exchanger outlet of the second condensation recovery assembly is also communicated with the heat exchanger inlet of the first condensation recovery assembly; the refrigeration assembly can also comprise a compressor and a throttle valve, and the refrigerant in the refrigeration assembly is discharged by the compressor and flows into the evaporator after passing through the throttle valve.
The hot air conversion assembly can comprise a fan and an air heat exchanger, and the heat exchanger outlet of the first condensation recovery assembly is communicated with the inlet of the air heat exchanger; an intermittent spraying device is arranged in the first condensation recovery assembly; a continuous spraying assembly is arranged between the first condensation recycling assembly and the second condensation recycling assembly; the continuous spraying assembly can comprise a continuous spraying device, a water tank arranged below the continuous spraying device and a circulating pump; and an electrostatic adsorption device or an activated carbon adsorption device can be arranged behind the second condensation recovery component.
The other aspect of the application also relates to a waste heat recovery process of the setting machine, which comprises a waste gas waste heat recovery step and a heat exchange medium heat exchange step;
wherein, the waste gas waste heat recovery step includes:
(1) Discharging the waste gas from the waste gas channel after the setting machine works;
(2) The waste gas passes through the first condensation recovery component and exchanges heat with the heat exchanger in the waste gas to carry out high-temperature condensation recovery, so that the temperature of the waste gas is reduced;
(3) The cooled waste gas is continuously cooled through a second condensation recovery assembly, and the tail gas is discharged;
the heat exchange step of the heat exchange medium comprises the following steps:
(1) The heat exchange medium entering the second condensation recovery assembly heat exchanger from the storage tank exchanges heat with the refrigerant in the refrigeration assembly evaporator, and the temperature of the heat exchange medium is reduced;
(2) The heat exchange medium enters a heat exchanger of the second condensation recovery assembly and then exchanges heat with the waste gas in the second condensation recovery assembly, and the temperature of the heat exchange medium is increased;
(3) The heat exchange medium entering the heat exchanger of the first condensation recovery assembly from the storage tank exchanges heat with the refrigerant in the condenser of the refrigeration assembly, and the strand of heat exchange medium is converged with the heat exchange medium flowing out of the heat exchanger of the second condensation recovery assembly and flows into the heat exchanger of the first condensation recovery assembly together;
(4) The heat exchange medium in the heat exchanger of the first condensation recovery assembly exchanges heat with the waste gas in the first condensation recovery assembly, and the temperature of the heat exchange medium flowing out of the heat exchanger of the first condensation recovery assembly rises;
(5) The heat exchange medium continuously flows into the air heat exchanger of the hot air conversion assembly to exchange heat with the air sucked into the fan, so that the temperature of the sucked air is increased, and the temperature of the heat exchange medium is reduced;
(6) The hot air with the temperature rising enters the setting machine for recycling, and the heat exchange medium with the temperature falling flows back into the storage box for recycling.
The waste heat recovery system and the waste heat recovery process of the setting machine have the following technical advantages:
(1) According to the waste heat recovery device, aiming at the common waste heat waste phenomenon of the waste gas in the industry of the setting machine, the condensation recovery components with different heat exchange temperatures are respectively arranged at the downstream of the waste heat recovery device, so that most components in the waste gas can be condensed and recovered, the graded recovery of heat is realized, the waste gas recovery efficiency is improved, and the pollution to the environment is reduced;
(2) The heat exchange medium enters the heat exchanger of the heat exchanger from the downstream of heat recovery, the temperature rises after heat exchange, and the heat is recovered again and enters the setting machine after passing through the hot air conversion assembly, so that the heat recovery and utilization efficiency is increased;
(3) The refrigeration component is arranged between the heat exchangers of the condensation recovery components with different heat exchange temperatures, so that heat brought by temperature differences between the heat exchangers with different levels can be reused through evaporation and condensation of the refrigeration component, and the heat utilization efficiency of the system is improved.
Drawings
Fig. 1 is a schematic diagram of a waste heat recovery system of a setting machine of the present application.
Fig. 2 is a schematic flow chart of a waste heat recovery process of the setting machine of the present application.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail hereinafter with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be arbitrarily combined with each other. The heat exchange medium in the application can not generate phase change in the waste heat recovery process, for example, heat conduction oil can be optimized, so that the heat exchange medium can obtain higher temperature after waste heat recovery; or a medium generating phase change, such as water, which generates high-temperature steam or hot water after heat recovery, heat exchange and phase change. For convenience of explanation, the present application will be described by taking heat transfer oil as an example. The heat exchange tubes in the first and second condensation recovery units herein may be metal or non-metal tubes, preferably metal tubes.
As shown in fig. 1, a waste heat recovery system of a setting machine according to the present application includes a first condensation recovery assembly 20 and a second condensation recovery assembly 40 that are sequentially disposed at a downstream of the setting machine 10, a refrigeration assembly 50 is disposed between a heat exchange inlet pipe of the first condensation recovery assembly 20 and a heat exchange inlet pipe of the second condensation recovery assembly 40, and a hot air conversion assembly 60 is connected between a heat exchange outlet pipe of the first condensation recovery assembly 20 and the setting machine 10. In this application, exhaust gas is discharged from the exhaust gas channel of the setting machine 10, flows through the first condensation recovery assembly 20 and the second condensation recovery assembly 40 in sequence and exchanges heat with the heat exchanger therein to perform heat recovery, and tail gas is discharged through the outlet of the second condensation recovery assembly 40. The first condensation recovery unit 20 is a high temperature condensation recovery unit, the second condensation recovery unit 40 is a low temperature condensation recovery unit, the length ratio of the two units can be 0.1-10, and the temperature of the exhaust gas in the high temperature condensation recovery unit is higher than that of the exhaust gas in the low temperature condensation recovery unit. Those skilled in the art will appreciate that the high and low temperatures herein are merely comparative terms of art and do not require specific temperature ranges to be assigned thereto.
As shown in fig. 1, the heat exchange medium in the heat exchanger is supplied from the heat exchange medium storage tank 57 to the heat exchange inlet pipe of the second condensation recovery assembly 40 and the heat exchange inlet pipe of the first condensation recovery assembly 20, respectively. Since the temperature of the heat exchange medium required in the first condensation recovery assembly 20 is higher than the temperature of the heat exchange medium required in the second condensation recovery assembly 40, and at the same time, in order to reduce the temperature in the second condensation recovery assembly 40 as much as possible to condense and recover more of the exhaust gas components, a refrigeration assembly 50 may be provided between the heat exchange inlet of the second condensation recovery assembly 40 and the heat exchange inlet of the first condensation recovery assembly 20 to reduce the temperature of the heat exchange medium entering the heat exchanger of the second condensation recovery assembly 40 and to increase the temperature of the heat exchange medium entering the heat exchanger of the first condensation recovery assembly 20. On the other hand, after the heat exchange medium entering the second condensation recovery assembly 40 is subjected to heat exchange, the temperature of the heat exchange medium in the heat exchanger is also raised, and the heat exchange medium entering the heat exchanger of the first condensation recovery assembly 20 from the storage tank can be mixed and then enter the heat exchanger of the first condensation recovery assembly 20 together. The temperature of the heat exchange medium in the heat exchange tube of the first condensation recovery assembly 20 is further increased and this part of the heat can be recovered. In the application, the part of heat is converted into hot air through the hot air conversion assembly 60, and the hot air is recycled into the setting machine 10, so that the purpose of heat recovery is realized, and the utilization efficiency of energy sources is improved.
Because the setting machine contains a large amount of oil smoke and particulate matters, fire accidents are easy to form under electrostatic ignition, and the heat exchanger connected with the setting machine is damaged to ensure that the heat exchanger cannot work normally, therefore, a sensor and a valve can be arranged in the exhaust gas discharge channel, and when the sensor senses that the temperature parameter exceeds a threshold value, the gate of the exhaust gas channel is immediately closed. In addition, if the heat exchanger is directly used for heat exchange, the heat exchanger is accumulated and scaled, so that the heat exchange efficiency of the heat exchanger is reduced, and therefore, the waste gas can be preliminarily filtered by adopting a plurality of layers of filter screens, and most of particulate matters are removed. Further, because the filter screen is installed in the exhaust passage, whether the filter screen is installed in place is difficult to identify, a sensor can be installed at the position of the exhaust passage corresponding to the filter screen, an electric signal can be generated when the filter screen is installed in place, and the filter screen can be confirmed to be installed reliably.
Preferably, an intermittent spraying device 21 is also arranged in the first condensation recycling assembly 20, a water tank is arranged below the intermittent spraying device 21 to collect sprayed hot water, and a circulating pump is used for circulating and spraying the hot water in the water tank. The flat plate heat exchanger with the oil smoke and the particulate matters not easy to accumulate is adopted, and spray water used is hot water recovered by high-temperature condensation, and the hot water is subjected to particulate matter removal, oil smoke condensate removal and other treatments after being collected. The hot water is helpful for flushing accumulated and adhered oil smoke and particulate matters, so that the surface of the flat plate heat exchanger is kept clean. The intermittent spraying uses hot water recovered by high-temperature condensation, so that the heat in the waste gas can be kept from being lost, and meanwhile, the water is saved. In order to reduce the spray water consumption and improve the scouring force, the intermittent spraying device can be divided into a plurality of sections for spraying in sequence according to the sections. The instruction of intermittent spraying starting comes from the temperature detection results of the high-temperature condensation recovery waste gas inlet and the waste gas outlet, if the temperature of the waste gas inlet is unchanged and the temperature of the waste gas outlet is increased, the heat exchange efficiency of the heat exchanger is reduced, and the intermittent spraying device is required to be started until the temperature of the waste gas outlet is recovered to a required value.
As shown in fig. 1, a continuous spray assembly 30 is preferably further provided between the first condensation recovery assembly 20 and the second condensation recovery assembly 40 to further remove the soot and particulate matter contained in the exhaust gas. The continuously sprayed water also comes from the hot water recovered from the high temperature condensation to maintain the heat of the exhaust gas. The continuous spray assembly 30 includes a continuous spray device 31, a water tank placed under the continuous spray device 31, and a circulation pump. The exhaust gas in the continuous spraying device 31 runs from bottom to top, and the spray water flows reversely from top to bottom. Further, a filter screen may be provided in the continuous spray device 31 to block particulate matter. And meanwhile, the particles on the filter screen are flushed away from the filter screen by the water falling from the filter screen, so that the filter screen is not blocked by the particles. The water tank is used for collecting spray water of the continuous spraying device 31, and the circulating pump is used for sucking the spray water collected in the water tank into the continuous spraying device 31 to continue spraying.
As shown in fig. 1, the refrigeration assembly 50 includes an evaporator 51 and a condenser 52, and a compressor 53 and a throttle valve 54 are provided between the evaporator 51 and the condenser 52 to form a refrigeration cycle. The heat exchange medium is pumped by a first pump 55 to the heat exchanger inlet of the first condensate recovery assembly 20 and by a second pump 56 to the heat exchanger inlet of the second condensate recovery assembly 40. Wherein the evaporator 51 is disposed on a line connecting the heat exchanger inlet of the second condensation recovery assembly 40, and the condenser 52 is disposed on a line connecting the heat exchanger inlet of the first condensation recovery assembly 20. The heat exchanger outlet of the second condensation recovery assembly 40 is in communication with the heat exchanger inlet of the first condensation recovery assembly 20, such that the heat exchange medium after heat exchange and temperature increase by the condenser 52 merges with the heat exchange medium after heat exchange and temperature increase by the second condensation recovery assembly 40 before entering the heat exchanger inlet of the first condensation recovery assembly 20. The refrigerant in the refrigeration assembly is discharged from the compressor 53, and the refrigerant passing through the condenser 52 exchanges heat with the heat exchange medium, so that the heat release temperature of the refrigerant is reduced; the refrigerant is expanded and throttled by the throttle valve 54, flows into the evaporator 51, exchanges heat with another heat exchange medium, absorbs heat at a high temperature, and is sucked from the compressor, thereby forming a refrigeration cycle.
The waste heat recovery system of the setting machine comprises three heat exchange systems which are mutually related and mutually affected: and the heat exchange system is used for recovering waste heat between the heat exchange medium and waste gas, and the heat exchange system is used for exchanging heat between the heat exchange medium and air required by the setting machine and between the heat exchange medium and refrigerant in the refrigerating system. The flow and the temperature of the waste gas discharged by the discharge port of the setting machine determine the heat exchange quantity of three heat exchange systems of the waste heat recovery system; the fluctuation of the flow and the temperature of the exhaust gas of the setting machine can finally lead to unstable hot air sucked into the inlet of the setting machine; the oil smoke and the particulate matters in the waste gas of the setting machine accumulate on the heat exchanger to reduce the heat exchange efficiency, thereby reducing the waste heat recovery amount and finally also causing the heat content of the hot air at the inlet of the setting machine to be poor. Therefore, the pump, the fan, the compressor and the like of the waste heat recovery system can adopt a variable frequency motor so as to output proper pressure or flow according to proper working conditions; the flow control valve can also be arranged on a pipeline through which the heat exchange medium flows, so that the servo change of the flow of the heat exchange medium is realized.
The temperature of the waste gas at the waste gas outlet of the setting machine is up to 180-230 ℃, the temperature of the waste gas is reduced to 90-95 ℃ by a flat plate heat exchanger, and all the oil smoke with the condensation temperature higher than 100 ℃ contained in the waste gas is condensed into a fluid state, so that the oil smoke is easy to drip from the heat exchanger. In addition, most of high-temperature saturated steam in the waste gas at 90-95 ℃ is condensed to form a mixture with the oil smoke, so that the condensed oil smoke is stripped from the heat exchanger and drips. The temperature of the waste gas inlet of the second condensation recovery assembly 40 is 90-95 ℃, the temperature of the waste gas after heat exchange can be reduced to 20-25 ℃, and most of the oil smoke in the waste gas is condensed except for the gas with lower condensation temperature like formaldehyde. The second condensation recovery assembly can adopt a small-pipe-diameter heat exchanger with a light pipe type parallel channel, and has the technical advantages of high heat exchange efficiency and convenient cleaning. The waste gas after low-temperature condensation recovery treatment can further enter an electrostatic adsorption device or an active carbon adsorption device, so that the waste gas is discharged into the environment atmosphere after being cleaner. By detecting the inlet temperature and the outlet temperature of the second condensation recovery assembly, whether the heat exchange efficiency is reduced due to the accumulation of oil smoke and particulate matters can be obtained, and checking and cleaning are performed pertinently so as to recover to a required temperature value.
In the application, the temperature of the waste gas after heat exchange of the second condensation recovery assembly 40 needs to be reduced to 20-25 ℃, the temperature of the heat exchange medium is usually 10-25 ℃, the heat exchange medium enters the heat exchanger of the second condensation recovery assembly and then exchanges heat with the waste gas, the heat temperature in the waste gas absorbed by the heat exchange medium gradually rises, low-temperature condensation heat absorption outflow is completed, and the temperature of the heat exchange medium is 75-80 ℃. Through the monitoring and comparison of the inlet and outlet temperatures of the heat exchange medium in the heat exchanger of the second condensation recovery assembly, the heat exchange efficiency of the heat exchanger can be judged, and the heat exchanger can be cleaned, replaced, maintained, overhauled and the like.
Because the heat required by low-temperature condensation recovery is not large, only one part of the heat exchange medium can be treated into the low-temperature heat exchange medium, the other part of the heat exchange medium and the low-temperature heat exchange medium are combined together after absorbing the heat in the waste gas, and the temperature of the heat exchange medium after the combination is 65-75 ℃, namely the temperature of the heat exchange medium entering the heat exchanger of the first condensation recovery assembly 20 is 65-75 ℃. After the heat exchange medium with the temperature of 65-75 ℃ enters the heat exchanger of the first condensation recovery assembly 20, the heat exchange medium exchanges heat with the waste gas, absorbs heat in the waste gas, and completes high-temperature condensation heat absorption outflow, and the temperature of the heat exchange medium is 155-160 ℃. The heat exchange efficiency of the heat exchanger is judged by the temperature of the heat exchange medium entering the heat exchanger, the temperature of the heat exchange medium exiting the heat exchanger and the temperature difference between the two, and the intermittent spraying or the replacement and maintenance of the heat exchanger are carried out. Then, the heat exchange medium flows into a heat exchanger of the hot air conversion assembly which exchanges heat with the ambient air, absorbs heat by the ambient air, and the temperature is reduced to 45-50 ℃. The heat exchange medium after heat exchange with the ambient air flows into the storage tank and is redistributed by the hydraulic pump. One of the heat exchange mediums enters a condenser of the refrigeration module to exchange heat with the refrigerant in the condenser, absorbs the heat of the refrigerant, and the temperature is increased from 45-50 ℃ to 60-65 ℃. The other heat exchange medium in the split flow enters an evaporator of the refrigeration module to exchange heat with the refrigerant in the evaporator, the cold quantity of the refrigerant is absorbed, and the temperature is reduced from 45-50 ℃ to 10-15 ℃.
As shown in fig. 1, the hot air converting assembly 60 includes a fan 61 and an air heat exchanger 62. The temperature of the ambient air flowing into the air heat exchanger 62 before being sucked by the fan 61 is 30-40 ℃, the ambient air is subjected to heat exchange by a heat exchange medium in the air heat exchanger 62, the temperature rises to 130-135 ℃, and meanwhile, the temperature of the air sucked by the heat exchange medium absorbs heat, and the temperature drops to 45-50 ℃. The ambient air heated to 130-135 ℃ is further input into the hot air suction inlet of the setting machine 10 and recycled by the setting machine. The heat exchange medium which has fallen to 45-50 ℃ flows back into the heat exchange medium storage tank 57 and enters the next heat exchange cycle. The waste heat of the exhaust gas of the setting machine is recovered and finally converted into hot air to be supplied to the setting machine, so that energy conservation and environmental protection are realized, economic benefit is improved, and continuous and stable production of the setting machine can be ensured. The inhaled air in this application can be the air after the humidification, and the humidification air can effectively improve hot-blast heat exchanger's heat exchange efficiency, makes the hot-blast enthalpy value of heating higher.
The process for recovering waste heat by using the waste heat recovery system of the setting machine of the present application is described in detail below with reference to fig. 2, including a step of recovering waste heat and a step of exchanging heat with a heat exchange medium, where the step of recovering waste heat includes:
(1) After the setting machine works, the waste gas at 180-230 ℃ is discharged from the waste gas channel;
optionally, a sensor and a valve are arranged in the exhaust gas discharge channel of the setting machine, and when the sensor senses that the temperature parameter exceeds a threshold value, the gate for exhaust gas circulation is immediately closed so as to prevent the setting machine from fire; if the detected temperature is normal, keeping the fireproof gate open; furthermore, a filter screen for filtering solid particles can be arranged in the waste gas channel, whether the filter screen is arranged in place or not is judged through an installation sensor arranged in the waste gas channel, an electric signal is generated when the filter screen is arranged in place, and the filter screen can be confirmed to be reliably arranged;
(2) The waste gas passes through a first condensation recovery assembly and exchanges heat with a heat exchanger in the waste gas to carry out high-temperature condensation recovery, so that the temperature of the waste gas is reduced to 90-95 ℃;
preferably, whether the heat exchange efficiency of the first condensation recovery assembly is reduced is judged by detecting the exhaust gas inlet temperature and the exhaust gas outlet temperature of the first condensation recovery assembly, and if the heat exchange efficiency is reduced, an intermittent spraying device in the first condensation recovery assembly is started; spraying from top to bottom through an intermittent spraying device, enabling waste gas to flow from bottom to top, and collecting sprayed water into a water tank below the intermittent spraying device for recycling; all the oil smoke with the condensation temperature higher than 100 ℃ contained in the waste gas is condensed into a fluid state, most of high-temperature saturated water vapor in the waste gas with the temperature of 90-95 ℃ is also condensed to form a mixture with the oil smoke, and the condensed oil smoke is driven to be stripped and dripped from the heat exchanger;
the waste gas cooled to 90-95 ℃ by the first condensation recovery assembly can pass through the continuous spraying assembly to further remove oil smoke and particulate matters contained in the waste gas, and the continuously sprayed water is also from hot water recovered by high-temperature condensation to keep the temperature of the waste gas at 90-95 ℃;
(3) The waste gas with the temperature of 90-95 ℃ passes through a second condensation recovery assembly and is continuously cooled to 20-25 ℃ so as to condense most of oil smoke in the waste gas and discharge tail gas;
by detecting the exhaust gas inlet temperature and the exhaust gas outlet temperature of the second condensation recovery assembly, whether the heat exchange efficiency is reduced due to accumulation of oil smoke and particulate matters can be obtained, and checking and cleaning are performed pertinently so as to recover to a required temperature value.
In this application, heat transfer medium stores in the bin, can supply respectively to the heat exchanger of first condensation recovery subassembly and second condensation recovery subassembly through the pump, after carrying out the heat exchange with the air through hot-blast conversion subassembly at last, flows back into the bin. The heat exchange step of the heat exchange medium comprises the following steps:
(1) The heat exchange medium entering the second condensation recovery assembly heat exchanger from the storage tank exchanges heat with the refrigerant in the refrigeration assembly evaporator, and the temperature is reduced to 10-15 ℃;
(2) The heat exchange medium enters a heat exchanger of the second condensation recovery assembly and then exchanges heat with waste gas in the second condensation recovery assembly, and the temperature is increased to 75-80 ℃;
(3) The heat exchange medium entering the first condensation recovery assembly heat exchanger from the storage tank exchanges heat with the refrigerant in the refrigeration assembly condenser, and the temperature rises to 60-65 ℃; the strand of heat exchange medium is converged with the heat exchange medium with the temperature of 75-80 ℃ flowing out of the heat exchanger of the second condensation recovery assembly, and then flows into the heat exchanger of the first condensation recovery assembly together, and the temperature of the heat exchange medium flowing into the heat exchanger of the first condensation recovery assembly is 65-75 ℃;
(4) The heat exchange medium in the heat exchanger of the first condensation recovery assembly exchanges heat with the waste gas in the first condensation recovery assembly, and the temperature of the heat exchange medium flowing out of the heat exchanger of the first condensation recovery assembly is 155-160 ℃;
(5) The heat exchange medium continuously flows into an air heat exchanger of the hot air conversion assembly and exchanges heat with air sucked into the fan, so that the temperature of the sucked air is increased to 130-135 ℃, and the temperature of the heat exchange medium is reduced to 45-50 ℃;
(6) The hot air with the temperature of 130-135 ℃ enters the setting machine for recycling, and the heat exchange medium with the temperature of 45-50 ℃ flows back into the storage tank for recycling.
Although the embodiments disclosed in the present application are described above, the descriptions are merely for facilitating understanding of the present application, and are not intended to limit the present application. Any person skilled in the art to which this application pertains will be able to make any modifications and variations in form and detail of implementation without departing from the spirit and scope of the disclosure, but the scope of the patent claims of this application shall be subject to the scope of the claims that follow.
Claims (8)
1. The waste heat recovery system of the setting machine comprises a first condensation recovery component and a second condensation recovery component which are sequentially arranged at the downstream of the setting machine, wherein the length ratio of the first condensation recovery component to the second condensation recovery component is 0.1-10; the hot air conversion assembly comprises a fan and an air heat exchanger, and the outlet of the heat exchanger of the first condensation recovery assembly is communicated with the inlet of the air heat exchanger;
the refrigeration assembly comprises an evaporator and a condenser, wherein a heat exchange medium is pumped to the heat exchanger inlet of the first condensation recovery assembly through a first pump, pumped to the heat exchanger inlet of the second condensation recovery assembly through a second pump, the evaporator is arranged on a pipeline connected with the heat exchanger inlet of the second condensation recovery assembly, the condenser is arranged on a pipeline connected with the heat exchanger inlet of the first condensation recovery assembly, and the heat exchanger outlet of the second condensation recovery assembly is also communicated with the heat exchanger inlet of the first condensation recovery assembly, so that the heat exchange medium subjected to heat exchange and temperature rise through the condenser and the heat exchange medium subjected to heat exchange and temperature rise through the second condensation recovery assembly are converged before entering the heat exchanger inlet of the first condensation recovery assembly.
2. The waste heat recovery system of claim 1, wherein the refrigeration assembly further comprises a compressor and a throttle valve, and wherein refrigerant in the refrigeration assembly is discharged by the compressor and flows into the evaporator after passing through the throttle valve.
3. The waste heat recovery system of claim 1 or 2, wherein an intermittent spray device is provided in the first condensation recovery assembly.
4. The waste heat recovery system of claim 1 or 2, wherein a continuous spray assembly is provided between the first condensation recovery assembly and the second condensation recovery assembly.
5. The waste heat recovery system of claim 4, wherein the continuous spray assembly comprises a continuous spray device, a water tank positioned below the continuous spray device, and a circulation pump.
6. The waste heat recovery system according to any one of claims 1-2, 5, wherein the second condensation recovery assembly is further followed by an electrostatic adsorption device or an activated carbon adsorption device.
7. The waste heat recovery process of the setting machine is characterized in that the waste heat recovery system of claim 1 is utilized for waste heat recovery, and the waste heat recovery process comprises the step of waste gas waste heat recovery and the step of heat exchange of a heat exchange medium;
wherein, the waste gas waste heat recovery step includes:
(1) Discharging the waste gas from the waste gas channel after the setting machine works;
(2) The waste gas passes through the first condensation recovery component and exchanges heat with the heat exchanger in the waste gas to carry out high-temperature condensation recovery, so that the temperature of the waste gas is reduced;
(3) The cooled waste gas is continuously cooled through a second condensation recovery assembly, and the tail gas is discharged;
the heat exchange step of the heat exchange medium comprises the following steps:
(1) The heat exchange medium entering the second condensation recovery assembly heat exchanger from the storage tank exchanges heat with the refrigerant in the refrigeration assembly evaporator, and the temperature of the heat exchange medium is reduced;
(2) The heat exchange medium enters a heat exchanger of the second condensation recovery assembly and then exchanges heat with the waste gas in the second condensation recovery assembly, and the temperature of the heat exchange medium is increased;
(3) The heat exchange medium entering the heat exchanger of the first condensation recovery assembly from the storage tank exchanges heat with the refrigerant in the condenser of the refrigeration assembly, and the strand of heat exchange medium is converged with the heat exchange medium flowing out of the heat exchanger of the second condensation recovery assembly and flows into the heat exchanger of the first condensation recovery assembly together;
(4) The heat exchange medium in the heat exchanger of the first condensation recovery assembly exchanges heat with the waste gas in the first condensation recovery assembly, and the temperature of the heat exchange medium flowing out of the heat exchanger of the first condensation recovery assembly rises;
(5) The heat exchange medium continuously flows into the air heat exchanger of the hot air conversion assembly to exchange heat with the air sucked into the fan, so that the temperature of the sucked air is increased, and the temperature of the heat exchange medium is reduced;
(6) The hot air with the temperature rising enters the setting machine for recycling, and the heat exchange medium with the temperature falling flows back into the storage box for recycling.
8. The waste heat recovery process of the setting machine is characterized in that the waste heat recovery system of claim 1 is utilized for waste heat recovery, and the waste heat recovery process comprises the step of waste gas waste heat recovery and the step of heat exchange of a heat exchange medium;
wherein, the waste gas waste heat recovery step includes:
(1) After the setting machine works, discharging the waste gas at 180-230 ℃ from the waste gas channel;
(2) The waste gas passes through a first condensation recovery assembly, and exchanges heat with a heat exchanger in the waste gas to perform high-temperature condensation recovery, so that the temperature of the waste gas is reduced to 90-95 ℃;
(3) The waste gas with the temperature of 90-95 ℃ passes through a second condensation recovery assembly, and is continuously cooled to 20-25 ℃ so as to condense most of oil smoke in the waste gas and discharge tail gas;
the heat exchange step of the heat exchange medium comprises the following steps:
(1) The heat exchange medium entering the second condensation recovery assembly heat exchanger from the storage tank exchanges heat with the refrigerant in the refrigeration assembly evaporator, and the temperature is reduced to 10-15 ℃;
(2) After entering a heat exchanger of the second condensation recovery assembly, the heat exchange medium exchanges heat with waste gas in the second condensation recovery assembly, and the temperature is increased to 75-80 ℃;
(3) The heat exchange medium entering the first condensation recovery assembly heat exchanger from the storage tank exchanges heat with the refrigerant in the refrigeration assembly condenser, and the temperature is increased to 60-65 ℃; the strand of heat exchange medium is converged with the heat exchange medium with the temperature of 75-80 ℃ flowing out of the heat exchanger of the second condensation recovery assembly, and then flows into the heat exchanger of the first condensation recovery assembly together, and the temperature of the heat exchange medium flowing into the heat exchanger of the first condensation recovery assembly is 65-75 ℃;
(4) The heat exchange medium in the heat exchanger of the first condensation recovery assembly exchanges heat with the waste gas in the first condensation recovery assembly, and the temperature of the heat exchange medium flowing out of the heat exchanger of the first condensation recovery assembly is 155-160 ℃;
(5) The heat exchange medium continuously flows into an air heat exchanger of the hot air conversion assembly and exchanges heat with air sucked into the fan, so that the temperature of the sucked air is increased to 130-135 ℃, and the temperature of the heat exchange medium is reduced to 45-50 ℃;
(6) The hot air with the temperature of 130-135 ℃ enters a setting machine for recycling, and the heat exchange medium with the temperature of 45-50 ℃ flows back into a storage tank for recycling.
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