CN114233241A - Phase change heat storage and heat pump heat source coupling thickened oil well heating system and control method - Google Patents
Phase change heat storage and heat pump heat source coupling thickened oil well heating system and control method Download PDFInfo
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- 239000003129 oil well Substances 0.000 title abstract description 12
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- 239000007788 liquid Substances 0.000 claims abstract description 96
- 238000004146 energy storage Methods 0.000 claims abstract description 81
- 238000005485 electric heating Methods 0.000 claims abstract description 71
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/04—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones using electrical heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H7/00—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release
- F24H7/02—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid
- F24H7/04—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid with forced circulation of the transfer fluid
- F24H7/0408—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid with forced circulation of the transfer fluid using electrical energy supply
- F24H7/0433—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid with forced circulation of the transfer fluid using electrical energy supply the transfer medium being water
- F24H7/0441—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid with forced circulation of the transfer fluid using electrical energy supply the transfer medium being water with supplementary heating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
- F24H9/1818—Arrangement or mounting of electric heating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2014—Arrangement or mounting of control or safety devices for water heaters using electrical energy supply
- F24H9/2028—Continuous-flow heaters
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- 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
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
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- 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
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
- F28D20/028—Control arrangements therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to the technical field of heating of thick oil wells, in particular to a phase change heat storage and heat pump heat source coupling thick oil well heating system and a control method, wherein the system comprises an air source heat pump, a phase change energy storage system, a heat exchanger, a standby electric heating device, a cache tank and a water mixing valve, independent heat supply or combined heat supply is realized through opening and closing of a first valve and a second valve, meanwhile, a heating circulation path of system return water and a heating circulation path of liquid in the phase change energy storage system are mutually independent, and the standby electric heating device is matched for design, so that when the phase change energy storage system is insufficient in heat supply, rapid heat supplement can be realized by using the standby electric heating device, the heating timeliness is high, the incompatibility problem caused by insufficient heating timeliness of the system return water and the heat supply of the phase change energy storage system is solved, a stable and sustainable heat source is provided for an underground hot water circulation unit, the system has the advantages of multistage standby, continuous operation guarantee, convenient control and reduction of the complexity of a control system.
Description
Technical Field
The invention relates to the technical field of heating of thick oil wells, in particular to a phase change heat storage and heat pump heat source coupling thick oil well heating system and a control method.
Background
The characteristics of deep burial, high colloid and asphaltene content, dispersed oil-containing regions and the like generally exist in domestic heavy oil reservoirs, and a large amount of residual oil still exists after a plurality of heavy oil reservoirs are exploited in a conventional mode. Meanwhile, with the continuous increase of the exploitation depth, the problems of wax deposition and the like of the sucker rod can occur, and the exploitation efficiency of the oil field is seriously influenced.
The viscosity of underground thick oil is mainly reduced by oil field enterprises through a heating viscosity reduction method, a thermal composite chemical swallowing and spitting method, a thin viscosity mixing method, a viscosity reducer adding method and the like. However, the thermal composite chemical swallowing-spitting method has high cost and cannot be popularized in a large range, a new organic matter can be added into the thick oil by the dilution viscosity reduction method to influence the subsequent processing and refining of the thick oil, and the environment is influenced by the addition of the viscosity reducer.
The heating viscosity reduction is widely used due to the advantages of simple equipment, high viscosity reduction efficiency and the like, and the high-temperature hot water is injected to heat the thick oil so as to raise the temperature of the thick oil and increase the solubility of crystals in the thick oil. Meanwhile, the molecular activity in the thickened oil becomes better due to the temperature rise, so that the thickened oil macromolecular structure is easier to break and fracture, and a small molecular group is formed to greatly reduce the viscosity of the thickened oil. The traditional method for heating the injected water mainly comprises a boiler heating method and a geothermal method, a large amount of coal resources are consumed by depending on the continuous heat supply of a boiler, the production cost is improved, and the geothermal method has low heat supply amount and low heat conversion rate and cannot meet the mining requirement.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to solve the defects in the prior art, a phase change heat storage and heat pump heat source coupling thickened oil well heating system and a control method are provided, and phase change heat storage is carried out at night mainly by utilizing the difference between peak electricity and valley electricity.
The technical scheme adopted by the invention for solving the technical problems is as follows: a phase-change heat storage and heat pump heat source coupling thickened oil well heating system comprises an air source heat pump, a phase-change energy storage system, a heat exchanger, a standby electric heating device, a cache tank and a water mixing valve;
the water inlet of the air source heat pump is communicated with the water outlet of the underground hot water circulation unit through a liquid inlet pipe, the water outlet of the air source heat pump is communicated with the inlet of the standby electric heating device through a first-stage liquid outlet pipe, the outlet of the standby electric heating device is communicated with the inlet of the cache tank, the outlet of the cache tank is communicated with the water inlet of the underground hot water circulation unit through a second-stage liquid outlet pipe, the first-stage liquid outlet pipe is provided with a first circulation pump, and the second-stage liquid outlet pipe is provided with a third circulation pump;
the phase-change energy storage system is provided with a phase-change energy storage tank, an energy storage system electric heating device and a second circulating pump, a liquid outlet of the phase-change energy storage tank is communicated with an inlet of the energy storage system electric heating device through a pipeline A, an outlet of the energy storage system electric heating device is communicated with a liquid inlet of the phase-change energy storage tank through a pipeline B, and the second circulating pump is arranged on the pipeline A or the pipeline B;
the heat source inlet and the heat source outlet of the heat exchanger are connected in series on the pipeline A or the pipeline B, the cold source inlet of the heat exchanger is communicated with the first-stage liquid outlet pipe through the bypass pipe A, the cold source outlet of the heat exchanger is communicated with the first-stage liquid outlet pipe through the bypass pipe B, the first-stage liquid outlet pipe is provided with a first valve, the first valve is located between the bypass pipe A and the bypass pipe B, the bypass pipe A is provided with a second valve, a backflow pipe is communicated between the second-stage liquid outlet pipe and the liquid inlet pipe, and the water mixing valve is installed on the backflow pipe.
According to the scheme, the scheme that the air source heat pump is combined with the phase-change energy storage system is adopted, the phase-change heat storage is carried out at night by utilizing the difference between the valley electricity and the peak electricity at night, the heat stored at night is utilized during the peak electricity and the flat electricity at daytime, the low-cost stable heat source is realized through the optimization of the opening and closing of the first valve and the second valve, and a stable and sustainable heat source is provided for the underground hot water circulating unit of the thickened oil, so that the viscosity of the thickened oil in a shaft is reduced, the phenomenon of paraffin precipitation of a rod pipe is reduced, the pump detection period is prolonged, the production cost of oil field enterprises is reduced, and the mechanical production efficiency of an oil well is improved;
in order to reduce the electricity consumption cost, an electric heating device of a phase change heat storage system is started to heat only at the valley power at night, phase change materials are stored, the heat stored at night is utilized during the peak power and flat power at daytime, once the system runs in the off-peak power period and the heat supply of a phase change heat storage tank is insufficient, if a standby electric heating device is not configured, the electric heating device of the heat storage system can only be started again to supplement heat for the phase change heat storage tank, but the heating timeliness cannot be met, because the temperature of a heat exchanger cannot be ensured when the electric heating device of the heat storage system is started and the phase change materials in the phase change heat storage tank are heated, the outlet water temperature of the system cannot meet the requirement, and the problem is called incompatibility;
in view of this, in the application, a heating flow path of system backwater (liquid flowing out of a water outlet of an underground hot water circulation unit) and a heating flow path of liquid inside a phase change energy storage system are independent from each other and are matched with the design of a standby electric heating device, so that when the phase change energy storage system is insufficient in heat supply, the standby electric heating device can be used for quickly supplementing heat, the heating timeliness is high, the problem that the system backwater heating timeliness and the phase change energy storage system are incompatible when the phase change energy storage system is insufficient in heat supply is solved, and the standby electric heating device can be used for emergency heat when an air source heat pump or the phase change energy storage system is damaged; the control is convenient, and the complexity of system control is reduced;
the buffer tank can improve the stability and continuity of the outlet water temperature of the heating system, and particularly in the winter operation process, even if the air source heat pump is in a defrosting condition, the outlet water temperature can be stably maintained within a certain range due to the existence of the buffer tank, so that the normal operation of the system cannot be influenced;
the design of the water mixing valve and the return pipe enables a part of heated liquid to be mixed with system return water, and the water inlet temperature of the air source heat pump is increased, so that the heat efficiency and the heat supply stability of the air source heat pump are improved.
The control system comprises a controller, a first temperature sensor, a second temperature sensor and a third temperature sensor, wherein the first temperature sensor is used for monitoring the temperature of liquid flowing out of a water outlet of the underground hot water circulation unit, the second temperature sensor is used for monitoring the temperature of liquid flowing into a water inlet of the air source heat pump, the third temperature sensor is used for monitoring the temperature of liquid flowing out of a liquid outlet of the phase change energy storage tank, and the first temperature sensor, the second temperature sensor, the third temperature sensor, the first valve, the second valve, the water mixing valve, the air source heat pump, the energy storage system electric heating device, the second circulation pump and the standby electric heating device are in signal connection with the controller; the controller controls the first valve, the second valve, the water mixing valve, the air source heat pump, the energy storage system electric heating device, the second circulating pump and the standby electric heating device to be opened or closed.
Furthermore, the first valve, the second valve and the water mixing valve are all electric valves.
Further, the first circulation pump is located between the air source heat pump and the bypass pipe a.
Furthermore, the connecting end of the return pipe and the second-stage liquid outlet pipe is positioned between the third circulating pump and the buffer tank.
In order to prevent backflow, the backflow pipe is further provided with a one-way valve used for allowing liquid to flow from the secondary liquid outlet pipe to the liquid inlet pipe.
Further, the standby electric heating device adopts a pipeline type electric heater.
Further, the heat exchanger adopts a plate heat exchanger.
The invention also provides a control method of the phase change heat storage and heat pump heat source coupling thickened oil well heating system, which comprises a first control method and a second control method which adopt mutually independent control strategies, wherein the first control method is used for controlling whether the phase change energy storage system or/and the standby electric heating device supplies heat with the air source heat pump in a combined manner, and the second control method is used for controlling whether the electric heating device of the energy storage system works;
the first control method includes the steps of:
step s1, setting TinIs the outlet water temperature set value of the underground hot water circulation unit;
step s2, starting the air source heat pump, the first circulating pump and the third circulating pump, and opening the water mixing valve;
step s3, obtaining the actual temperature value T of the water outlet of the underground hot water circulation unit1The value of the ambient temperature T1And TinComparing;
if Tin-ΔTin≤T1＜Tin+ΔTinIf the first valve and the second valve are closed, the second circulating pump and the second valve are opened, and the first valve and the standby electric heating device are closed, so that the combined heat supply of the air source heat pump and the phase change energy storage system is realized;
if T1≥Tin+ΔTinIf the second circulating pump, the second valve and the standby electric heating device are closed, the first valve is opened, and independent heat supply of the air source heat pump is realized; wherein, Delta TinThe temperature difference is controlled for the return water temperature.
If T1＜Tin-ΔTinThen make it beatThe electric heating device is prepared;
the second control method includes the steps of:
step s1, setting T0The temperature is a set value of the liquid temperature in the phase change energy storage tank;
step s2, obtaining the actual temperature value T of the liquid at the liquid outlet of the phase-change energy storage tank7；
Step s3, dividing the time period of the whole day operation of the heavy oil well heating system into a valley power time period and a non-valley power time period, and entering s4 if the heavy oil well heating system operates in the valley power time period; if the heating system of the heavy oil well is operated in the off-peak electricity period, the operation proceeds to s 5;
step s4, during the valley period, if T7＜T0-ΔT0Turning on an electric heating device of the energy storage system and starting a second circulating pump; if T7≥T0-ΔT0Turning on an electric heating device of the energy storage system and starting a second circulating pump; wherein, Delta T0Controlling the temperature difference for the heating temperature;
and step s5, turning off the electric heating device of the energy storage system and the second circulating pump in the off-peak electricity period.
Further, a third control method for controlling the opening degree of the water mixing valve is also included;
step s1, setting the initial opening of the water mixing valve;
step s2, obtaining the temperature T of the liquid flowing into the water inlet of the air source heat pump2；
E.g. a ≦ T2When b is less than or equal to b, maintaining the initial opening of the water mixing valve unchanged;
such as T2A, gradually increasing the opening of the water mixing valve until T2Stopping the opening increasing when the opening is b;
such as T2When the opening degree of the water mixing valve is larger than b, the opening degree of the water mixing valve is gradually reduced until T2Stopping the opening increasing when the opening is a;
wherein, the value of a is 63 +/-1 ℃, and the value of b is 67 +/-1 ℃.
The invention has the beneficial effects that: the invention adopts the scheme of combining the air source heat pump and the phase-change energy storage system, realizes independent heat supply or combined heat supply by opening and closing the first valve and the second valve, simultaneously adopts the mutual independence of the heating flow path of system backwater and the heating flow path of liquid in the phase-change energy storage system, and is matched with the design of the standby electric heating device, realizes the rapid heat compensation by using the standby electric heating device when the phase-change energy storage system is insufficient in heat supply, has high heating timeliness, solves the incompatibility problem of the system backwater heating timeliness and the phase-change energy storage system insufficient heat supply, provides a stable and sustainable heat source for the underground hot water circulation unit, has the advantages of multistage standby, ensures continuous operation, is convenient to control, and reduces the complexity of the control system.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic diagram of a phase change heat storage and heat pump heat source coupled heavy oil well heating system of the present invention;
in the figure, 1, an air source heat pump;
2. a phase change energy storage system 201, a phase change energy storage tank 202, an energy storage system electric heating device 203, pipelines A and 204 and a pipeline B;
3. 4, a heat exchanger, 4, a standby electric heating device, 5, a buffer tank, 6, a water mixing valve, 7, an underground hot water circulation unit, 8, a liquid inlet pipe, 9, a first-stage liquid outlet pipe, 10, a second-stage liquid outlet pipe, 11, a return pipe, 12, a first temperature sensor, 13, a second temperature sensor, 14, a third temperature sensor, 15, a one-way valve, 16, bypass pipes A and 17 and a bypass pipe B;
p1, a first circulating pump, P2, a second circulating pump, P3 and a third circulating pump;
v1, a first valve, V2 and a second valve.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic diagrams illustrating the basic structure of the present invention only in a schematic manner, and thus show only the constitution related to the present invention, and directions and references (e.g., upper, lower, left, right, etc.) may be used only to help the description of the features in the drawings. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the claimed subject matter is defined only by the appended claims and equivalents thereof.
Example 1
As shown in fig. 1, a phase change heat storage and heat pump heat source coupling thick oil well heating system includes an air source heat pump 1, a phase change energy storage system 2, a heat exchanger 3, a standby electric heating device 4, a buffer tank 5 and a water mixing valve 6, wherein the heat exchanger 3 adopts a plate heat exchanger, the standby electric heating device 4 adopts a pipeline type electric heater, the air source heat pump 1 adopts a cascade air source heat pump, and the rated outlet water temperature: 75 ℃, maximum water outlet temperature: 85 ℃;
the water inlet of the air source heat pump 1 is communicated with the water outlet of the underground hot water circulation unit 7 through a liquid inlet pipe 8, the underground hot water circulation unit 7 comprises a hollow sucker rod and a Y-shaped filter, for example, the water outlet of the hollow sucker rod is communicated with the liquid inlet pipe 8 through the Y-shaped filter, the liquid inlet pipe 8 is communicated with the water inlet of the air source heat pump 1, the water outlet of the air source heat pump 1 is communicated with the inlet of the standby electric heating device 4 through a primary liquid outlet pipe 9, the outlet of the standby electric heating device 4 is communicated with the inlet of the cache tank 5, the outlet of the cache tank 5 is communicated with the water inlet of the underground hot water circulation unit 7 through a secondary liquid outlet pipe 10, and the cache tank 5 is used for storing a certain amount of heated liquid so as to improve the continuity of heat supply; a first circulating pump P1 is arranged on the first-stage liquid outlet pipe 9, and a third circulating pump P3 is arranged on the second-stage liquid outlet pipe 10;
the phase change energy storage system 2 is provided with a phase change energy storage tank 201, an energy storage system electric heating device 202 and a second circulating pump P2, the phase change energy storage tank 201 adopts a high-temperature phase change energy storage tank 201, the phase change temperature is 115 ℃, the heat supply temperature is 85-95 ℃, a liquid outlet of the phase change energy storage tank 201 is communicated with an inlet of the energy storage system electric heating device 202 through a pipeline A203, an outlet of the energy storage system electric heating device 202 is communicated with a liquid inlet of the phase change energy storage tank 201 through a pipeline B204, and the second circulating pump P2 is arranged on the pipeline A203 or the pipeline B204;
a heat source inlet and a heat source outlet of the heat exchanger 3 are connected in series on the pipeline A203 or the pipeline B204, a cold source inlet of the heat exchanger 3 is communicated with the first-stage liquid outlet pipe 9 through a bypass pipe A16, a first circulating pump P1 is positioned between the air source heat pump 1 and the bypass pipe A16, a cold source outlet of the heat exchanger 3 is communicated with the first-stage liquid outlet pipe 9 through a bypass pipe B17, a first valve V1 is arranged on the first-stage liquid outlet pipe 9, a first valve V1 is positioned between the bypass pipe A16 and the bypass pipe B17, a second valve V2 is arranged on the bypass pipe A16, wherein the first valve V1 and the second valve V2 are both electric valves; a return pipe 11 is communicated between the second-stage liquid outlet pipe 10 and the liquid inlet pipe 8, the connecting end of the return pipe 11 and the second-stage liquid outlet pipe 10 is positioned between the third circulating pump P3 and the cache tank 5, and the water mixing valve 6 is arranged on the return pipe 11, so that part of heated liquid is mixed with system return water, and the working efficiency and the heat supply stability of the air source heat pump 1 are improved; to prevent reverse flow, return pipe 11 is fitted with a one-way valve 15 for allowing liquid to flow from secondary outlet pipe 10 into inlet pipe 8.
The control system comprises a controller, a first temperature sensor 12, a second temperature sensor 13 and a third temperature sensor 14, wherein the first temperature sensor 12 is used for monitoring the temperature of liquid flowing out of a water outlet of the underground hot water circulation unit 7, the second temperature sensor 13 is used for monitoring the temperature of liquid flowing into a water inlet of the air source heat pump 1, the third temperature sensor 14 is used for monitoring the temperature of liquid at a liquid outlet of the phase change energy storage tank 201, and the first temperature sensor 12, the second temperature sensor 13, the third temperature sensor 14, a first valve V1, a second valve V2, a water mixing valve 6, the air source heat pump 1, the energy storage system electric heating device 202, a second circulation pump P2 and the standby electric heating device 4 are in signal connection with the controller; the controller controls the first valve V1, the second valve V2, the water mixing valve 6, the air source heat pump 1, the energy storage system electric heating device 202, the second circulating pump P2 and the standby electric heating device 4 to be opened or closed.
The water mixing valve 6 is kept open during the operation of the system, and the air source heat pump 1, the first circulating pump P1 and the third circulating pump P3 can be in a normally open mode:
when the return water temperature of the system is low, when the first valve V1 is closed and the second valve V2 is opened, the air source heat pump 1 and the phase change energy storage system 2 work jointly, part of heated liquid in the second-stage liquid outlet pipe 10 passes through the return pipe 11 and the water mixing valve 6 and then enters the liquid inlet pipe 8, and is converged with return water flowing out of the water outlet of the underground hot water circulation unit 7, and then reaches the air source heat pump 1 to realize first-stage heating, and after first-stage heating, the liquid passes through the bypass pipe A16, the second valve V2, the heat exchanger 3 and the bypass pipe B17 from the first-stage liquid outlet pipe 8 to realize second-stage heating, and after second-stage heating, the liquid reaches the standby electric heating device 4, then enters the cache tank 5, and finally is pumped into the water inlet of the underground hot water circulation unit 7 from the second-stage liquid outlet pipe 10;
for example, the air source heat pump 1 heats the system backwater at 55 ℃ to 80 ℃, the heat exchange with the phase change energy storage system 2 is realized after the system backwater passes through the heat exchanger 3, the temperature is further raised to 90 ℃, then the system backwater enters the buffer tank 5, and finally the system backwater is pumped into the underground hot water circulation unit 7 from the secondary liquid outlet pipe 10 to form heating circulation;
when the return water temperature of the system is high, when the first valve V1 is opened and the second valve V2 is closed, the air source heat pump 1 works independently, part of heated liquid in the second-stage liquid outlet pipe 10 passes through the return pipe 11 and the water mixing valve 6 and then reaches the liquid inlet pipe 8, and is converged with return water flowing out of the water outlet of the underground hot water circulation unit 7, and then reaches the air source heat pump 1 to realize first-stage heating, and the heated liquid reaches the standby electric heating device 4 from the first-stage liquid outlet pipe 8 through the first valve V1, then enters the buffer tank 5, and finally is pumped into the water inlet of the underground hot water circulation unit 7 from the second-stage liquid outlet pipe 10;
when the air source heat pump 1 is damaged, the phase change energy storage system 2 is insufficient in heat supply or the phase change energy storage system 2 is damaged, the standby electric heating device 4 starts to work.
In fact, the air source heat pump 1 has high heating efficiency in summer, and the probability of using the phase change energy storage system 2 is low.
Example 2
The invention also provides a control method of the phase change heat storage and heat pump heat source coupling thickened oil well heating system, which comprises a first control method and a second control method which adopt mutually independent control strategies, wherein the first control method is used for controlling whether the phase change energy storage system 2 or/and the standby electric heating device 4 supply heat with the air source heat pump 1 in a combined manner, and the second control method is used for controlling whether the energy storage system electric heating device 202 works or not;
the first control method includes the steps of:
step s1, in the controllerIn setting TinFor the outlet water temperature set point of the downhole hot water circulation unit 7, e.g. TinThe temperature is set to 55 ℃ for factory production and can be adjusted;
step s2, starting the air source heat pump 1, the first circulating pump P1 and the third circulating pump P3, and opening the water mixing valve 6;
step s3, acquiring the actual temperature value T of the water outlet of the underground hot water circulation unit 7 by the first temperature sensor 121And sends it to the controller, which will measure the temperature T1And TinComparing;
if Tin-ΔTin≤T1＜Tin+ΔTinIf the controller opens the second circulating pump P2 and the second valve V2, closes the first valve V1 and the standby electric heating device 4, and realizes the combined heat supply of the air source heat pump 1 and the phase change energy storage system 2;
if T1≥Tin+ΔTinIf the controller closes the second circulating pump P2, the second valve V2 and the standby electric heating device 4, and opens the first valve V1, the air source heat pump 1 realizes independent heat supply; wherein, Delta TinThe temperature difference is controlled for the return water temperature, the factory setting is 3 ℃, and the temperature can be adjusted.
If T1＜Tin-ΔTinIf the heat storage capacity of the phase change energy storage system 2 is not enough, the standby electric heating device 4 is turned on;
the second control method includes the steps of:
step s1, setting T in the controller0Is the set value of the temperature of the liquid in the phase-change energy storage tank 201;
step s2, the third temperature sensor 14 obtains the actual temperature value T of the liquid at the liquid outlet of the phase change energy storage tank 2013；
Step s3, dividing the time period of the whole day operation of the heavy oil well heating system into a valley power time period and a non-valley power time period, and entering s4 if the heavy oil well heating system operates in the valley power time period; if the heating system of the heavy oil well is operated in the off-peak electricity period, the operation proceeds to s 5;
step s4, during the valley period, if T3＜T0-ΔT0Electric heating device for opening energy storage system202, starting the second circulating pump P2; if T3≥T0-ΔT0Turning on the energy storage system electric heating device 202, and starting the second circulating pump P2; wherein, Delta T0Controlling the temperature difference for the heating temperature;
step s5, in off-peak electricity time period, the electric heating device 202 of the energy storage system and the second circulating pump P2 are closed;
therefore, joint heat supply or independent heat supply can be automatically selected according to the change of the return water temperature of the system.
In order to improve the heating efficiency of the air source heat pump 1, a third control method for controlling the opening degree of the water mixing valve 6 is further included;
step s1, setting the initial opening degree of the mixing valve 6 in the controller;
step s2, obtaining the temperature T of the liquid flowing into the water inlet of the air source heat pump 1 by the second temperature sensor 132；
E.g. a ≦ T2When the opening degree is less than or equal to b, the controller maintains the initial opening degree of the water mixing valve 6 unchanged;
such as T2The controller gradually increases the opening degree of the water mixing valve 6 until T2Stopping the opening increasing when the opening is b;
such as T2When the opening degree is more than b, the controller gradually reduces the opening degree of the water mixing valve 6 until T2Stopping the opening increasing when the opening is a;
wherein, the value of a is 63 +/-1 ℃, and the value of b is 67 +/-1 ℃.
Thereby realizing that the opening degree of the water mixing valve 6 can follow T2Is changed to optimize the heating efficiency of the air source heat pump 1.
In light of the foregoing description of the preferred embodiment of the present invention, it is to be understood that numerous changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. The utility model provides a phase transition heat accumulation and heat pump heat source coupling viscous crude well heating system which characterized in that: the system comprises an air source heat pump (1), a phase change energy storage system (2), a heat exchanger (3), a standby electric heating device (4), a buffer tank (5) and a water mixing valve (6);
the water inlet of the air source heat pump (1) is communicated with the water outlet of the underground hot water circulation unit (7) through a liquid inlet pipe (8), the water outlet of the air source heat pump (1) is communicated with the inlet of the standby electric heating device (4) through a primary liquid outlet pipe (9), the outlet of the standby electric heating device (4) is communicated with the inlet of the cache tank (5), the outlet of the cache tank (5) is communicated with the water inlet of the underground hot water circulation unit (7) through a secondary liquid outlet pipe (10), a first circulating pump (P1) is arranged on the primary liquid outlet pipe (9), and a third circulating pump (P3) is arranged on the secondary liquid outlet pipe (10);
the phase change energy storage system (2) is provided with a phase change energy storage tank (201), an energy storage system electric heating device (202) and a second circulating pump (P2), a liquid outlet of the phase change energy storage tank (201) is communicated with an inlet of the energy storage system electric heating device (202) through a pipeline A (203), an outlet of the energy storage system electric heating device (202) is communicated with a liquid inlet of the phase change energy storage tank (201) through a pipeline B (204), and the second circulating pump (P2) is configured on the pipeline A (203) or the pipeline B (204);
the heat source inlet and the heat source outlet of the heat exchanger (3) are connected in series on the pipeline A (203) or the pipeline B (204), the cold source inlet of the heat exchanger (3) is communicated with the first-stage liquid outlet pipe (9) through the bypass pipe A (16), the cold source outlet of the heat exchanger (3) is communicated with the first-stage liquid outlet pipe (9) through the bypass pipe B (17), the first-stage liquid outlet pipe (9) is provided with a first valve (V1), the first valve (V1) is located between the bypass pipe A (16) and the bypass pipe B (17), the bypass pipe A (16) is provided with a second valve (V2), a return pipe (11) is communicated between the second-stage liquid outlet pipe (10) and the liquid inlet pipe (8), and the water mixing valve (6) is installed on the return pipe (11).
2. The phase-change heat storage and heat pump heat source coupled heavy oil well heating system according to claim 1, characterized in that: further comprising a control system comprising a controller, a first temperature sensor (12), a second temperature sensor (13) and a third temperature sensor (14), the first temperature sensor (12) is used for monitoring the temperature of liquid flowing out of the water outlet of the underground hot water circulation unit (7), the second temperature sensor (13) is used for monitoring the temperature of liquid flowing into the water inlet of the air source heat pump (1), the third temperature sensor (14) is used for monitoring the temperature of liquid at the liquid outlet of the phase change energy storage tank (201), the first temperature sensor (12), the second temperature sensor (13), the third temperature sensor (14), the first valve (V1), the second valve (V2), the water mixing valve (6), the air source heat pump (1), the energy storage system electric heating device (202), the second circulating pump (P2) and the standby electric heating device (4) are in signal connection with the controller.
3. The phase-change heat storage and heat pump heat source coupled heavy oil well heating system according to claim 2, characterized in that: the first valve (V1), the second valve (V2) and the water mixing valve (6) are all electric valves.
4. The phase-change heat storage and heat pump heat source coupled heavy oil well heating system according to claim 1, characterized in that: the first circulation pump (P1) is located between the air source heat pump (1) and the bypass pipe A (16).
5. The phase-change heat storage and heat pump heat source coupled heavy oil well heating system according to claim 1, characterized in that: the connecting end of the return pipe (11) and the secondary liquid outlet pipe (10) is positioned between the third circulating pump (P3) and the buffer tank (5).
6. The phase-change heat storage and heat pump heat source coupled heavy oil well heating system according to claim 1, characterized in that: the return pipe (11) is provided with a one-way valve (15) for allowing liquid to flow into the liquid inlet pipe (8) from the secondary liquid outlet pipe (10).
7. The phase-change heat storage and heat pump heat source coupled heavy oil well heating system according to claim 1, characterized in that: the standby electric heating device (4) adopts a pipeline type electric heater.
8. The phase-change heat storage and heat pump heat source coupled heavy oil well heating system according to claim 1, characterized in that: the heat exchanger (3) adopts a plate heat exchanger.
9. A control method for a phase change heat storage and heat pump heat source coupled heavy oil well heating system according to any one of claims 1 to 8, characterized in that: the method comprises a first control method and a second control method which adopt mutually independent control strategies, wherein the first control method is used for controlling whether a phase-change energy storage system (2) or/and a standby electric heating device (4) and an air source heat pump (1) supply heat in a combined mode, and the second control method is used for controlling whether an electric heating device (202) of the energy storage system works or not;
the first control method includes the steps of:
step s1, setting TinIs a set value of the water outlet temperature of the water outlet of the underground hot water circulation unit (7);
step s2, starting the air source heat pump (1), the first circulating pump (P1) and the third circulating pump (P3), and opening the water mixing valve (6);
step s3, obtaining the actual temperature value T of the water outlet of the underground hot water circulation unit (7)1The value of the ambient temperature T1And TinComparing;
if Tin-ΔTin≤T1＜Tin+ΔTinIf so, opening a second circulating pump (P2) and a second valve (V2), closing the first valve (V1) and the standby electric heating device (4), and realizing the combined heat supply of the air source heat pump (1) and the phase change energy storage system (2);
if T1≥Tin+ΔTinIf so, closing the second circulating pump (P2), the second valve (V2) and the standby electric heating device (4), and opening the first valve (V1) to realize independent heat supply of the air source heat pump (1); wherein, Delta TinThe temperature difference is controlled for the return water temperature.
If T1＜Tin-ΔTinThen the standby electric heating device (4) is turned on;
the second control method includes the steps of:
step s1, setting T0Is a set value of the temperature of the liquid in the phase-change energy storage tank (201);
step s2, obtaining the actual temperature value T of the liquid at the liquid outlet of the phase-change energy storage tank (201)7；
Step s3, dividing the time period of the whole day operation of the heavy oil well heating system into a valley power time period and a non-valley power time period, and entering s4 if the heavy oil well heating system operates in the valley power time period; if the heating system of the heavy oil well is operated in the off-peak electricity period, the operation proceeds to s 5;
step s4, during the valley period, if T7＜T0-ΔT0Turning on the electric heating device (202) of the energy storage system, and starting a second circulating pump (P2); if T7≥T0-ΔT0Turning on the electric heating device (202) of the energy storage system, and starting a second circulating pump (P2); wherein, Delta T0Controlling the temperature difference for the heating temperature;
step s5, during off-peak periods, the energy storage system electrical heating (202) and the second circulation pump (P2) are switched off.
10. The control method of the phase-change heat storage and heat pump heat source coupled heavy oil well heating system according to claim 9, characterized in that: the control method also comprises a third control method for controlling the opening degree of the water mixing valve (6);
step s1, setting the initial opening degree of the water mixing valve (6);
step s2, obtaining the temperature T of the liquid flowing into the water inlet of the air source heat pump (1)2；
E.g. a ≦ T2When the opening degree is less than or equal to b, the initial opening degree of the water mixing valve (6) is maintained unchanged;
such as T2A, gradually increasing the opening degree of the water mixing valve (6) until T2Stopping the opening increasing when the opening is b;
such as T2When the opening degree is more than b, the opening degree of the water mixing valve (6) is gradually reduced until T2Stopping the opening increasing when the opening is a;
wherein, the value of a is 63 +/-1 ℃, and the value of b is 67 +/-1 ℃.
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