CN116678015A - Automatic temperature adjustment system and method for heat storage water tank based on waste heat recovery - Google Patents
Automatic temperature adjustment system and method for heat storage water tank based on waste heat recovery Download PDFInfo
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- CN116678015A CN116678015A CN202310768622.8A CN202310768622A CN116678015A CN 116678015 A CN116678015 A CN 116678015A CN 202310768622 A CN202310768622 A CN 202310768622A CN 116678015 A CN116678015 A CN 116678015A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 525
- 238000005338 heat storage Methods 0.000 title claims abstract description 118
- 239000002918 waste heat Substances 0.000 title claims abstract description 35
- 238000011084 recovery Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000000694 effects Effects 0.000 claims abstract description 14
- 239000000779 smoke Substances 0.000 claims abstract description 13
- 239000008399 tap water Substances 0.000 claims abstract description 12
- 235000020679 tap water Nutrition 0.000 claims abstract description 12
- 230000001105 regulatory effect Effects 0.000 claims abstract description 5
- 238000009413 insulation Methods 0.000 claims description 51
- 230000001502 supplementing effect Effects 0.000 claims description 29
- 230000008859 change Effects 0.000 claims description 25
- 230000001276 controlling effect Effects 0.000 claims description 22
- 238000003860 storage Methods 0.000 claims description 20
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 15
- 239000003546 flue gas Substances 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 10
- 238000010411 cooking Methods 0.000 claims description 8
- 238000007599 discharging Methods 0.000 abstract description 2
- 230000006872 improvement Effects 0.000 description 6
- 230000003020 moisturizing effect Effects 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000007363 regulatory process Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C13/00—Stoves or ranges with additional provisions for heating water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
- F28D7/163—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation with conduit assemblies having a particular shape, e.g. square or annular; with assemblies of conduits having different geometrical features; with multiple groups of conduits connected in series or parallel and arranged inside common casing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
Abstract
The application discloses a heat storage water tank automatic temperature regulating system and a method based on waste heat recovery, wherein the system comprises a heat storage water tank, a heat exchanger and a controller, a water level sensor is arranged in the heat storage water tank, the heat exchanger is used for enabling tap water and stove smoke to exchange heat to obtain hot water and discharging the hot water into the heat storage water tank, and the controller is configured to: the water level value in the heat storage water tank is obtained through the water level sensor, the water outlet temperature of the heat exchanger is controlled according to the water level value, when the water level value is in the first interval, the water outlet temperature of the heat exchanger is controlled to be the initial temperature, and when the water level value is in the second interval, the water outlet temperature of the heat exchanger is controlled to be increased along with the increase of the water level value, so that the water outlet quantity of the heat exchanger is reduced under the condition that the equivalent stove smoke waste heat is subjected to heat exchange. According to the application, the total heat storage capacity of the heat storage water tank is increased by automatically adjusting the water outlet temperature, so that the anti-overflow effect is achieved, meanwhile, the occupied area of the field is not increased, the cost control is lower, and the phenomenon of insufficient water supply is avoided.
Description
Technical Field
The application relates to the technical field of waste heat recovery equipment, in particular to a heat storage water tank automatic temperature adjustment system and method based on waste heat recovery.
Background
In the application field of commercial cooking stoves, a large amount of smoke can be discharged in the use process of kitchen gas equipment such as restaurants, hotels and dining halls, and the direct discharge of the smoke can not only cause air pollution to influence kitchen working environment, but also cause a large amount of heat energy in the smoke to be wasted. At present, the common recovery mode for the flue gas waste heat is to use the flue gas waste heat as a heat source for heating tap water in a heat storage water tank to provide hot water for daily life.
The heat generated by the daily waste heat recovery of commercial stoves is substantially constant, but the amount of target temperature hot water generated by waste heat heating varies due to the different tap water temperatures per day. For example, the temperature difference between the tap water temperature and the target hot water temperature is small in summer, the hot water amount which can be produced by the same waste heat is high, the temperature difference between the tap water temperature and the target hot water temperature is large in winter, and the hot water amount which can be produced by the same waste heat is low. However, the volume of the heat storage water tank is fixed and limited, so that when the ambient temperature is high, the phenomenon that the water consumption amount of hot water in the heat storage water tank is larger than that of water is often caused, and the water tank overflows, so that hot water is wasted, and on the other hand, drainage protection and other facilities are required to be added for the overflow problem, and the heat storage water tank is very troublesome.
Aiming at the problems, if measures for increasing the volume and the quantity of the water tank are taken, the water tank is limited by factors such as sites, cost and maintenance, if the target temperature of the water tank is directly set at a higher value, enough hot water cannot be produced when the tap water temperature is low, the hot water output is lower than the water consumption for a long time, and the problem of insufficient water supply is caused.
Disclosure of Invention
The application aims to provide a heat storage water tank automatic temperature regulating system and method based on waste heat recovery, which solve the defect that the existing heat storage water tank based on waste heat recovery is easily overflowed due to the influence of environmental temperature.
The application realizes the above purpose through the following technical scheme:
the utility model provides a heat storage water tank automatic temperature regulation system based on waste heat recovery, the system includes heat storage water tank, heat exchanger and controller, wherein, be equipped with level sensor in the heat storage water tank, the heat exchanger is used for making running water and kitchen range flue gas carry out the heat exchange and obtain hot water and discharge hot water to the heat storage water tank in, the controller is configured to:
the water level value in the heat storage water tank is obtained through the water level sensor, the water outlet temperature of the heat exchanger is controlled according to the water level value, when the water level value is in a first interval, the water outlet temperature of the heat exchanger is controlled to be the initial temperature, and when the water level value is in a second interval, the water outlet temperature of the heat exchanger is controlled to be increased along with the increase of the water level value, so that the water outlet quantity of the heat exchanger is reduced under the condition that the equivalent amount of flue gas waste heat of the cooking range exchanges heat;
the first interval is [ H ] min ，H a ) The second interval is [ H ] a ，H max ) Wherein H is min At the lowest water level, H a For adjusting the trigger water level to be preset, H max Is the highest water level.
A further improvement is that the adjustment triggers the water level H a When the water level value is in the first interval, the water outlet temperature of the heat exchanger is controlled to be 50 ℃, and when the water level value is in the second interval, the water outlet temperature of the heat exchanger is controlled to be increased along with the increase of the water level value within the range of 50-70 ℃.
The further improvement lies in, the heat exchanger is including the barrel that is used for circulating kitchen range flue gas, be equipped with the heat exchange tube of parallel distribution in the barrel, the running water is connected to the inlet end of heat exchange tube, and the inlet end position is equipped with moisturizing solenoid valve, and the play water end of heat exchange tube is connected with the heat storage water tank, and goes out water end position and be equipped with out water temperature sensor, the controller passes through out water temperature sensor and acquires the hot water temperature of heat exchange tube play water end to according to the hot water temperature control moisturizing solenoid valve work of play water end, and specifically does: when the hot water temperature of the water outlet end reaches the set water outlet temperature, the water supplementing valve is controlled to be opened, and when the hot water temperature of the water outlet end is lower than the set water outlet temperature, the water supplementing valve is controlled to be closed.
The further improvement lies in, be connected with the back flow on the heat storage water tank, the back flow communicates to the inlet end of heat exchange tube, and is equipped with the check valve and is controlled the water pump of work by the controller on the back flow, the controller is further configured to: when the water level value is the highest water level H max When the water supplementing valve is controlled to be closed, the water pump is controlled to be started, hot water in the heat storage water tank flows back through the heat exchange pipe and exchanges heat with stove smoke in the cylinder body again, and therefore the temperature of the hot water in the heat storage water tank is increased; when the water level value is lower than the highest water level H max And when the water pump is in operation, the process of controlling the water supplementing electromagnetic valve to work according to the hot water temperature of the water outlet end is resumed, and the water pump is controlled to stop working.
A further improvement is that a water storage temperature sensor is arranged in the heat storage water tank, and the controller is further configured to: and in the starting stage of the water pump, acquiring the temperature of hot water in the heat storage water tank through a water storage temperature sensor, and controlling the water pump to stop working when the temperature of the hot water is not lifted within a set period of time.
The further improvement lies in, the case wall of heat storage water tank comprises variable insulating layer, phase transition heat accumulation layer, fixed insulating layer from inside to outside in proper order, variable insulating layer and fixed insulating layer are by the concatenation of vacuum insulation board constitution, and wherein variable insulating layer is equipped with the air pump that is used for evacuating or injecting air to vacuum insulation board inner chamber, the controller is further configured to: and in the starting stage of the water pump, acquiring the temperature of hot water in the heat storage water tank through a water storage temperature sensor, and controlling the air pump to inject air into the inner cavity of the vacuum heat insulation plate of the variable heat insulation layer when the temperature of the hot water is not lifted within a set period of time, so that the variable heat insulation layer loses the heat insulation effect, the heat of the hot water in the heat storage water tank is transferred to the phase change heat storage layer, and after the phase change heat storage layer finishes phase change and stores the heat, controlling the water pump to stop working.
A further improvement is that the system further comprises an alarm controlled by the controller, the alarm comprising a controllerThe controller is further configured to: when the water level value is the highest water level H max And when the alarm is controlled to give an alarm.
The application also provides a method for automatically adjusting the temperature of the heat storage water tank based on waste heat recovery, which utilizes the system and comprises the following specific steps:
the water level value in the heat storage water tank is obtained through the water level sensor, the water outlet temperature of the heat exchanger is controlled according to the water level value, when the water level value is in a first interval, the water outlet temperature of the heat exchanger is controlled to be the initial temperature, and when the water level value is in a second interval, the water outlet temperature of the heat exchanger is controlled to be increased along with the increase of the water level value, so that the water outlet quantity of the heat exchanger is reduced under the condition that the equivalent amount of flue gas waste heat of the cooking range exchanges heat; the first interval is [ H ] min ，H a ) The second interval is [ H ] a ，H max ) Wherein H is min At the lowest water level, H a For adjusting the trigger water level to be preset, H max Is the highest water level; and controlling the water outlet temperature of the heat exchanger means that the water outlet temperature sensor is used for acquiring the hot water temperature of the water outlet end of the heat exchange tube, controlling the water supplementing electromagnetic valve to work according to the hot water temperature of the water outlet end, and specifically comprises the following steps: when the hot water temperature of the water outlet end reaches the set water outlet temperature, the water supplementing valve is controlled to be opened, and when the hot water temperature of the water outlet end is lower than the set water outlet temperature, the water supplementing valve is controlled to be closed;
when the water level value is the highest water level H max When the water supplementing valve is controlled to be closed, the water pump is controlled to be started, hot water in the heat storage water tank flows back through the heat exchange pipe and exchanges heat with stove smoke in the cylinder body again, and therefore the temperature of the hot water in the heat storage water tank is increased; when the water level value is lower than the highest water level H max When the water pump is in operation, the process of controlling the water supplementing electromagnetic valve to work according to the hot water temperature of the water outlet end is resumed, and the water pump is controlled to stop working;
and in the starting stage of the water pump, acquiring the temperature of hot water in the heat storage water tank through a water storage temperature sensor, controlling the air pump to inject air into the inner cavity of the vacuum heat insulation plate of the variable heat insulation layer when the temperature of the hot water is not lifted within a set period of time, so that the variable heat insulation layer loses the heat insulation effect, transferring the heat of the hot water in the heat storage water tank to the phase change heat storage layer, and controlling the water pump to stop working after the phase change heat storage layer finishes phase change and stores the heat.
The application has the beneficial effects that:
(1) According to the application, the total heat storage capacity of the heat storage water tank is increased by automatically adjusting the water outlet temperature, so that the anti-overflow effect is achieved, meanwhile, the occupied area of a field is not increased, the cost control is low, and the phenomenon of insufficient water supply is avoided;
(2) In the preferred scheme of the application, when the water level of the heat storage water tank is full, the heat storage capacity of the water tank is further improved in a hot water backflow and reheating mode and a phase change heat storage starting mode, so that waste of waste heat can be avoided in hot summer with overhigh ambient temperature, and overflow phenomenon is avoided.
Drawings
FIG. 1 is a schematic diagram of a thermostat system;
FIG. 2 is a control schematic diagram of a thermostat system;
FIG. 3 is a schematic diagram of the tank wall structure of the hot water storage tank;
in the figure: 1. a heat storage water tank; 2. a heat exchanger; 3. a controller; 4. a water level sensor; 5. a heat exchange tube; 6. a water supplementing valve; 7. a water outlet temperature sensor; 8. a check valve; 9. a return pipe; 10. a water pump; 11. a water storage temperature sensor; 12. a variable thermal barrier; 13. a phase change heat storage layer; 14. fixing the heat insulation layer; 15. an air pump; 16. an alarm.
Detailed Description
The present application will be described in further detail with reference to the accompanying drawings, wherein it is to be understood that the following detailed description is for the purpose of further illustrating the application only and is not to be construed as limiting the scope of the application, as various insubstantial modifications and adaptations of the application to those skilled in the art can be made in light of the foregoing disclosure.
Referring to fig. 1-3, a heat storage water tank automatic temperature adjustment system based on waste heat recovery includes a heat storage water tank 1, a heat exchanger 2 and a controller 3, wherein a water level sensor 4 is disposed in the heat storage water tank 1 and is used for detecting a water level value of stored hot water, the heat exchanger 2 is used for performing heat exchange between tap water and stove flue gas to obtain hot water and discharging the hot water into the heat storage water tank 1, and the controller 3 is specifically configured to perform an automatic temperature adjustment process:
the water level value in the heat storage water tank 1 is obtained through the water level sensor 4, the water outlet temperature of the heat exchanger 2 is controlled according to the water level value, when the water level value is in the first interval, the water outlet temperature of the heat exchanger 2 is controlled to be the initial temperature, when the water level value is in the second interval, the water outlet temperature of the heat exchanger 2 is controlled to be increased along with the increase of the water level value, and the heat generated by daily waste heat recovery of a commercial stove is basically constant, so that the water outlet of the heat exchanger 2 can be reduced under the condition of heat exchange of the equivalent stove smoke waste heat, the water outlet amount stored in the heat storage water tank 1 is reduced, the total heat storage amount of the heat storage water tank 1 is correspondingly increased, and the anti-overflow effect is achieved. In addition, when the water level value of the heat storage water tank 1 is less, the water outlet temperature can not be increased, so that the water outlet quantity can be ensured, and the problem of insufficient water supply caused by long-term lower hot water output quantity than water consumption is avoided.
Wherein the first interval is [ H ] min ，H a ) The second interval is [ H ] a ，H max )，H min At the lowest water level, e.g. 100%, H a For a preset adjustment of the trigger level, it may preferably be set to 50%, H max Is the highest water level, for example 5%. The specific temperature adjustment mode is as follows: when the water level value is 5% -50%, the water outlet temperature of the heat exchanger 2 is controlled to be 50 ℃, and when the water level value is 50% -100%, the water outlet temperature of the heat exchanger 2 is controlled to be increased along with the increase of the water level value within the range of 50-70 ℃. For example: when the water level value is 75%, controlling the water outlet temperature to be 60 ℃; when the water level value is 100%, the water outlet temperature is controlled to be 70 ℃. Of course, the water outlet temperature can be set differently according to the needs, and only needs to be in one-to-one correspondence with the water level value.
The preferred heat exchanger 2 structure is provided, it includes the barrel that is used for circulating kitchen range flue gas, be equipped with parallel densely distributed heat exchange tube 5 in the barrel, the running water is connected to the inlet end of heat exchange tube 5, and inlet end position is equipped with moisturizing solenoid valve 6, and the outlet end of heat exchange tube 5 is connected with heat storage water tank 1, and outlet end position is equipped with out water temperature sensor 7, controller 3 acquires the hot water temperature of heat exchange tube 5 outlet end through out water temperature sensor 7 to control moisturizing solenoid valve 6 when the hot water temperature of outlet end reaches the play water temperature of settlement, hot water in the heat exchange tube 5 can flow in heat storage water tank 1 this moment, when the hot water temperature of outlet end is less than the play water temperature of settlement, control moisturizing solenoid valve 6 is closed immediately, can realize the control to play water temperature like this, and the higher outlet water temperature, means that running water is longer in heat exchanger 2 dwell time, the degree of carrying out heat exchange is deeper, the hot water volume of production is less, the same supplementing self-adaptation running water becomes less.
In addition, if the environmental temperature is too high, for example, in hot summer, even if the water outlet temperature is continuously and automatically adjusted and raised, the condition that hot water in the hot water storage tank 1 overflows after being fully stored can still occur, and at the moment, the waste heat of the flue gas of the cooking range can not be continuously recycled, so that waste is caused. It should be noted that when the hot water in the hot water storage tank 1 is fully stored, the temperature of the hot water stored in the hot water storage tank 1 is continuously raised, but the temperature of the hot water is relatively low in most parts before, so that the whole temperature after being fully stored is not high, for example, about 55 ℃, and the hot water can be further absorbed in the hot water storage tank. To this end, the present system may make further optimizations: the heat storage water tank 1 is connected with a return pipe 9, the return pipe 9 is communicated to the water inlet end of the heat exchange pipe 5, the return pipe 9 is provided with a check valve 8 and a water pump 10 controlled to work by the controller 3, and the controller 3 is further configured to: when the water level value is the highest water level H max When the water supplementing valve 6 is controlled to be closed, namely whether the hot water temperature at the water outlet end of the heat exchange tube 5 reaches the set water outlet temperature or not is controlled to be closed, tap water is not supplemented any more, overflow is prevented, meanwhile, the water pump 10 is controlled to be started, hot water in the heat storage water tank 1 flows back through the heat exchange tube 5 and exchanges heat with stove smoke in the cylinder body again, so that the hot water temperature in the heat storage water tank 1 can be increased to 80 ℃ or even 90 ℃ through continuous circulation; when the water level value is lower than the highest water level H max When in use, the working process of the water supplementing solenoid valve 6 is controlled according to the hot water temperature of the water outlet end, and the water pump 10 is controlled to stopStopping the operation, and recovering the automatic temperature regulation process, the check valve 8 can prevent tap water from directly flowing into the heat storage water tank 1 through the return pipe 9.
In the process of backflow, if no hot water is supplied, the water level value stays at the highest water level H max The water pump 10 always works to enable hot water in the heat storage water tank 1 to reach the heat exchange limit of flue gas, heat absorption and heat storage can not be continued, and at the moment, electric energy waste caused by the operation of the water pump 10 can be caused, so that the system can be further optimized: the heat storage water tank 1 is internally provided with a water storage temperature sensor 11, and the controller 3 is further configured to: in the starting stage of the water pump 10, the temperature of hot water in the heat storage water tank 1 is obtained through the water storage temperature sensor 11, and when the temperature of the hot water is not lifted any more within a set period of time (for example, 5 min), the water pump 10 is controlled to stop working, so that electric energy waste is avoided.
When the temperature of the hot water is not lifted within the set time, the fact that the hot water in the heat storage water tank 1 can not absorb heat and store heat is indicated, and waste of waste heat can be caused if the waste heat of the flue gas of the cooking range is not recovered. To this end, the present system may make further optimizations: the wall of the heat storage water tank 1 is composed of a variable heat insulation layer 12, a phase change heat storage layer 13 and a fixed heat insulation layer 14 from inside to outside, the variable heat insulation layer 12 and the fixed heat insulation layer 14 are formed by splicing vacuum heat insulation plates, wherein the variable heat insulation layer 12 is provided with an air pump 15 for vacuumizing or injecting air into the inner cavity of the vacuum heat insulation plate, the variable heat insulation layer 12 provides excellent heat insulation and preservation effects like the fixed heat insulation layer 14 when vacuumizing, and after injecting air, the heat insulation and preservation effects of the variable heat insulation layer 12 are suddenly reduced, and the heat conductivity coefficient is obviously increased. The controller 3 is further configured to: in the starting stage of the water pump 10, the temperature of the hot water in the heat storage water tank 1 is obtained through the water storage temperature sensor 11, and when the temperature of the hot water is not lifted within a set period of time (for example, 5 min), the air pump 15 is controlled to inject air into the inner cavity of the vacuum insulation board of the variable heat insulation layer 12, so that the variable heat insulation layer 12 loses the heat insulation effect, the heat of the hot water in the heat storage water tank 1 is transferred to the phase change heat storage layer 13, and after the phase change heat storage layer 13 finishes phase change and stores the heat (generally, the phase change is finished within a certain period of time, and therefore, the temperature can be controlled by the period of time, for example, 30 min), the water pump 10 is controlled to stop working.
Preferably, the material of the phase-change heat storage layer 13 may be solid paraffin, which can change phase at a relatively low temperature (60-70 ℃) to be converted into a liquid state and absorb a large amount of heat.
In addition, the above solutions can only slow down the time of overflow, the final solution of overflow prevention is of course also for the customer to use water, for which purpose the system preferably further comprises an alarm 16 controlled by the controller 3, said controller 3 being further configured to: when the water level value is the highest water level H max When the water storage tank 1 is full, the control alarm 16 gives an alarm, which can be an indicator lamp alarm or a remote alarm of a mobile phone terminal.
The application also provides a method for automatically adjusting the temperature of the heat storage water tank based on waste heat recovery, which utilizes the system and comprises the following specific steps:
the water level value in the heat storage water tank 1 is obtained through the water level sensor 4, the water outlet temperature of the heat exchanger 2 is controlled according to the water level value, when the water level value is in a first interval, the water outlet temperature of the heat exchanger 2 is controlled to be the initial temperature, and when the water level value is in a second interval, the water outlet temperature of the heat exchanger 2 is controlled to be increased along with the increase of the water level value, so that the water outlet quantity of the heat exchanger 2 is reduced under the condition that the equivalent amount of stove smoke waste heat is subjected to heat exchange; the first interval is [ H ] min ，H a ) The second interval is [ H ] a ，H max ) Wherein H is min At the lowest water level, H a For adjusting the trigger water level to be preset, H max Is the highest water level; and controlling the water outlet temperature of the heat exchanger 2 means obtaining the hot water temperature of the water outlet end of the heat exchange tube 5 through the water outlet temperature sensor 7, controlling the water supplementing electromagnetic valve 6 to work according to the hot water temperature of the water outlet end, and specifically comprises: when the hot water temperature of the water outlet end reaches the set water outlet temperature, the water supplementing valve 6 is controlled to be opened, and when the hot water temperature of the water outlet end is lower than the set water outlet temperature, the water supplementing valve 6 is controlled to be closed;
when the water level value is the highest water level H max When the water supplementing valve 6 is closed, i.e. no matter whether the hot water temperature at the water outlet end of the heat exchange tube 5 reaches the set valueThe water outlet temperature is controlled to be closed, so that tap water is not supplemented, overflow is prevented, the water pump 10 is controlled to be started, hot water in the heat storage water tank 1 flows back through the heat exchange pipe 5 and exchanges heat with stove smoke in the cylinder again, and the hot water temperature in the heat storage water tank 1 is improved through continuous circulation, for example, the temperature can be increased to 80 ℃ or even 90 ℃; when the water level value is lower than the highest water level H max When the automatic temperature regulating device is used, the process of controlling the water supplementing electromagnetic valve 6 to work according to the hot water temperature of the water outlet end is restored, the water pump 10 is controlled to stop working, the automatic temperature regulating process is restored, and the arrangement of the check valve 8 can prevent tap water from directly flowing into the heat storage water tank 1 through the return pipe 9;
at the starting stage of the water pump 10, the temperature of hot water in the heat storage water tank 1 is obtained through the water storage temperature sensor 11, and when the temperature of the hot water is not lifted within a set period of time, the air pump 15 is controlled to inject air into the inner cavity of the vacuum insulation board of the variable heat insulation layer 12, so that the variable heat insulation layer 12 loses the heat insulation effect, the heat of the hot water in the heat storage water tank 1 is transferred to the phase change heat storage layer 13, and after the phase change heat storage layer 13 finishes phase change and stores the heat, the water pump 10 is controlled to stop working.
After the phase-change heat storage layer 13 stores heat, the heat can be stored with low loss under the heat preservation effect of the fixed heat insulation layer 14, if more subsequent hot water is supplied, when the water temperature of the heat storage water tank 1 is lower than the phase-change temperature of the phase-change heat storage layer 13, the stored heat can be transferred into the hot water by the phase-change heat storage layer 13 and is gradually converted into a solid state, so that the stored heat is effectively utilized. After the phase change heat storage layer 13 is converted into a solid state, the air pump 15 can be controlled manually or automatically (automatic control can obtain the temperature of the hot water in the heat storage water tank 1 through the water storage temperature sensor 11, and the temperature is triggered after the temperature is kept below 55 ℃ for a certain period of time, for example, 60 minutes) to pump out the air in the inner cavity of the vacuum heat insulation plate of the variable heat insulation layer 12, so that the heat insulation effect is recovered, and the overall heat insulation effect of the heat storage water tank 1 is improved.
The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application.
Claims (8)
1. The utility model provides a heat storage water tank automatic temperature regulation system based on waste heat recovery, its characterized in that, the system includes heat storage water tank, heat exchanger and controller, wherein, be equipped with level sensor in the heat storage water tank, the heat exchanger is used for making running water and kitchen range flue gas carry out the heat exchange and obtain hot water and discharge hot water to the heat storage water tank in, the controller is configured to:
the water level value in the heat storage water tank is obtained through the water level sensor, the water outlet temperature of the heat exchanger is controlled according to the water level value, when the water level value is in a first interval, the water outlet temperature of the heat exchanger is controlled to be the initial temperature, and when the water level value is in a second interval, the water outlet temperature of the heat exchanger is controlled to be increased along with the increase of the water level value, so that the water outlet quantity of the heat exchanger is reduced under the condition that the equivalent amount of flue gas waste heat of the cooking range exchanges heat;
the first interval is [ H ] min ，H a ) The second interval is [ H ] a ，H max ) Wherein H is min At the lowest water level, H a For adjusting the trigger water level to be preset, H max Is the highest water level.
2. The heat storage water tank automatic temperature adjustment system based on waste heat recovery according to claim 1, wherein the adjustment triggers the water level H a When the water level value is in the first interval, the water outlet temperature of the heat exchanger is controlled to be 50 ℃, and when the water level value is in the second interval, the water outlet temperature of the heat exchanger is controlled to be increased along with the increase of the water level value within the range of 50-70 ℃.
3. The automatic temperature regulating system of a heat storage water tank based on waste heat recovery according to claim 1, wherein the heat exchanger comprises a cylinder body for circulating flue gas of a cooking range, parallel densely distributed heat exchange tubes are arranged in the cylinder body, water inlet ends of the heat exchange tubes are connected with tap water, water supplementing solenoid valves are arranged at water inlet end positions, water outlet ends of the heat exchange tubes are connected with the heat storage water tank, water outlet end positions are provided with water outlet temperature sensors, the controller obtains hot water temperature of water outlet ends of the heat exchange tubes through the water outlet temperature sensors, and controls water supplementing solenoid valves to work according to the hot water temperature of the water outlet ends, and the automatic temperature regulating system is characterized in that: when the hot water temperature of the water outlet end reaches the set water outlet temperature, the water supplementing valve is controlled to be opened, and when the hot water temperature of the water outlet end is lower than the set water outlet temperature, the water supplementing valve is controlled to be closed.
4. The heat storage water tank automatic temperature adjustment system based on waste heat recovery according to claim 3, wherein the heat storage water tank is connected with a return pipe, the return pipe is communicated to the water inlet end of the heat exchange pipe, the return pipe is provided with a check valve and a water pump controlled to work by a controller, and the controller is further configured to: when the water level value is the highest water level H max When the water supplementing valve is controlled to be closed, the water pump is controlled to be started, hot water in the heat storage water tank flows back through the heat exchange pipe and exchanges heat with stove smoke in the cylinder body again, and therefore the temperature of the hot water in the heat storage water tank is increased; when the water level value is lower than the highest water level H max And when the water pump is in operation, the process of controlling the water supplementing electromagnetic valve to work according to the hot water temperature of the water outlet end is resumed, and the water pump is controlled to stop working.
5. The heat recovery-based hot water tank thermostat system of claim 4, wherein a water storage temperature sensor is disposed within the hot water tank, the controller being further configured to: and in the starting stage of the water pump, acquiring the temperature of hot water in the heat storage water tank through a water storage temperature sensor, and controlling the water pump to stop working when the temperature of the hot water is not lifted within a set period of time.
6. The heat storage water tank automatic temperature adjustment system based on waste heat recovery according to claim 5, wherein the tank wall of the heat storage water tank is composed of a variable heat insulation layer, a phase change heat storage layer and a fixed heat insulation layer from inside to outside, the variable heat insulation layer and the fixed heat insulation layer are composed of vacuum heat insulation boards in a spliced mode, wherein the variable heat insulation layer is provided with an air pump for vacuumizing an inner cavity of the vacuum heat insulation board or injecting air, and the controller is further configured to: and in the starting stage of the water pump, acquiring the temperature of hot water in the heat storage water tank through a water storage temperature sensor, and controlling the air pump to inject air into the inner cavity of the vacuum heat insulation plate of the variable heat insulation layer when the temperature of the hot water is not lifted within a set period of time, so that the variable heat insulation layer loses the heat insulation effect, the heat of the hot water in the heat storage water tank is transferred to the phase change heat storage layer, and after the phase change heat storage layer finishes phase change and stores the heat, controlling the water pump to stop working.
7. The heat recovery based hot water tank thermostat system of claim 4, further comprising an alarm controlled by a controller, the controller further configured to: when the water level value is the highest water level H max And when the alarm is controlled to give an alarm.
8. A method for automatically adjusting temperature of a heat storage water tank based on waste heat recovery, which is characterized by using the system of claim 6, and comprises the following specific steps:
the water level value in the heat storage water tank is obtained through the water level sensor, the water outlet temperature of the heat exchanger is controlled according to the water level value, when the water level value is in a first interval, the water outlet temperature of the heat exchanger is controlled to be the initial temperature, and when the water level value is in a second interval, the water outlet temperature of the heat exchanger is controlled to be increased along with the increase of the water level value, so that the water outlet quantity of the heat exchanger is reduced under the condition that the equivalent amount of flue gas waste heat of the cooking range exchanges heat; the first interval is [ H ] min ，H a ) The second interval is [ H ] a ，H max ) Wherein H is min At the lowest water level, H a For adjusting the trigger water level to be preset, H max Is the highest water level; and controlling the water outlet temperature of the heat exchanger means that the water outlet temperature sensor is used for acquiring the hot water temperature of the water outlet end of the heat exchange tube, controlling the water supplementing electromagnetic valve to work according to the hot water temperature of the water outlet end, and specifically comprises the following steps: when the hot water temperature at the water outlet end reaches the set water outlet temperature, the water supplementing valve is controlled to be opened, and the hot water at the water outlet end is controlled to be openedWhen the temperature is lower than the set water outlet temperature, the water supplementing valve is controlled to be closed;
when the water level value is the highest water level H max When the water supplementing valve is controlled to be closed, the water pump is controlled to be started, hot water in the heat storage water tank flows back through the heat exchange pipe and exchanges heat with stove smoke in the cylinder body again, and therefore the temperature of the hot water in the heat storage water tank is increased; when the water level value is lower than the highest water level H max When the water pump is in operation, the process of controlling the water supplementing electromagnetic valve to work according to the hot water temperature of the water outlet end is resumed, and the water pump is controlled to stop working;
and in the starting stage of the water pump, acquiring the temperature of hot water in the heat storage water tank through a water storage temperature sensor, controlling the air pump to inject air into the inner cavity of the vacuum heat insulation plate of the variable heat insulation layer when the temperature of the hot water is not lifted within a set period of time, so that the variable heat insulation layer loses the heat insulation effect, transferring the heat of the hot water in the heat storage water tank to the phase change heat storage layer, and controlling the water pump to stop working after the phase change heat storage layer finishes phase change and stores the heat.
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