Heat supply control method, device and equipment of multi-stage heat tracing system and storage medium

Abstract

The invention discloses a heat supply control method, device and equipment for a multi-stage heat tracing system and a storage medium, and the method comprises the steps that a compressor is controlled to compress carbon dioxide, and the compressed carbon dioxide flows to a high-temperature cooler for heat exchange with first preset-temperature water supply; hot water meeting the heat tracing requirement of the hot washing section of the oil well and carbon dioxide after heat release are obtained; the carbon dioxide after heat release flows to a medium-temperature cooler to exchange heat with second preset-temperature supplied water, and hot water meeting the heat tracing requirement of the crude oil conveying section and carbon dioxide after secondary heat release are obtained; and heating the carbon dioxide after secondary heat release through a heat regenerator, enabling the heated carbon dioxide to flow to an overheating cooler through a vortex tube, and carrying out heat exchange on water supply at a second preset temperature, so as to obtain hot water meeting the heat tracing requirement of the sewage treatment section. The extra heating capacity of the vortex tube is fully utilized through the desuperheater, energy consumption in the heat supply process is reduced, and the resource utilization efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial heat pumps, and in particular to a heating control method, device, equipment and storage medium for a multi-stage heating system. Background Art

[0002] Crude oil process heating systems have multiple water temperature requirements. The wastewater treatment section requires heating at 30-60°C to promote oil-water separation, treat oily wastewater in settling tanks, and suppress the escape of corrosive gases. The crude oil transportation section requires heating at 40-60°C to prevent crude oil solidification at low temperatures and inhibit wax crystallization, especially for high-wax or high-viscosity crude oil, ensuring smooth oil transportation. The oil well hot wash section requires heating at 70-100°C. The incoming water temperature to the hot wash manifold in the metering room must reach above 75°C before hot wash can begin, ensuring the hot wash fluid effectively dissolves accumulated wax. However, traditional fossil fuel combustion or electric heating remain the primary heating methods for multi-stage crude oil process heating systems. The energy conversion efficiency of fossil fuel combustion is typically less than 50%. Electric heating, also limited by energy conversion and conservation processes, is less than 100%, resulting in significant energy waste, severe environmental pollution, and insufficient overall control accuracy.

[0003] Heat pump technology has become the preferred alternative to traditional heating technology due to its high efficiency, energy saving and precise temperature control. Heat pumps circulate and recycle heat from the air source, which is often regarded as a renewable energy source and can significantly reduce energy costs, reduce the consumption of traditional energy and the impact on the environment. As the most environmentally friendly natural refrigerant, it has a global warming potential (GWP) of 1 and an ozone depletion potential (ODP) of 0. It is non-toxic, non-flammable, inexpensive, abundant in resources, inert, non-corrosive, safe, and has strong thermal stability. Most importantly, due to its standard boiling point of -78°C, It exhibits excellent heating performance at low temperatures and can operate effectively at an ambient temperature of -35°C, giving it an extremely wide operating temperature range. When the critical pressure and temperature are 7.38MPa and 31.1°C respectively, The exothermic temperature under normal operation is higher than the critical temperature and is located in the supercritical region, operating in a transcritical cycle. In the supercritical state, convection heat transfer without phase change can be achieved, which is suitable for the countercurrent heat transfer mechanism to continuously heat the working fluid to the target temperature, breaking the constraint of the condensation temperature. However, the transcritical The irreversible losses in the cycle throttling process are very large.

[0004] Therefore, there is an urgent need for a heating control method for a multi-stage heating system that can reduce energy consumption during the heating process of the multi-stage heating system in the crude oil process and improve the resource utilization efficiency of the oil industry. Summary of the Invention

[0005] The main purpose of the present invention is to provide a heating control method, device, equipment and storage medium for a multi-stage heating system, aiming to solve the technical problems of huge energy consumption and low waste heat utilization efficiency in the heating process of a multi-stage heating system in crude oil process in the prior art.

[0006] To achieve the above objectives, the present invention provides a heat supply control method for a multi-stage heat tracing system, the method being applied to the multi-stage heat tracing system, wherein the system comprises a cooling circulation pipeline and a desuperheating and cooling pipeline, the cooling circulation pipeline comprising a compressor, a high-temperature cooler, an intermediate-temperature cooler, and a regenerator, the desuperheating and cooling pipeline comprising a vortex tube and a desuperheating and cooling pipeline, the hot fluid outlet of the vortex tube being connected to the inlet of the desuperheating and cooling pipeline, and the regenerator being connected to the vortex tube; The method comprises: controlling the compressor to compress the carbon dioxide to obtain compressed carbon dioxide; The compressed carbon dioxide is fed to the high-temperature cooler and heat-exchanged with water supplied at a first preset temperature to obtain hot water that meets the heating requirements of the hot wash section of the oil well and the exothermic carbon dioxide; The carbon dioxide after heat release flows to the medium-temperature cooler and the second preset temperature water supply for heat exchange, thereby obtaining hot water that meets the heating requirements of the crude oil transportation section and the carbon dioxide after secondary heat release; The carbon dioxide after the secondary heat release is heated by the regenerator, and the heated carbon dioxide flows to the desuperheater through the vortex tube, and is supplied to the second preset temperature water for heat exchange to obtain hot water that meets the heating requirements of the sewage treatment section.

[0007] Optionally, before the step of controlling the compressor to compress the carbon dioxide to obtain compressed carbon dioxide, the process further includes: Detecting the flow rate and temperature of the industrial waste heat wastewater, and comparing the flow rate and temperature of the industrial waste heat wastewater with a flow rate threshold and a temperature threshold, respectively, to obtain a comparison result; If the comparison result is that the flow rate of the industrial waste heat wastewater is less than the flow rate threshold or the temperature of the industrial waste heat wastewater is less than the temperature threshold, the air source heating mode is adopted; If the comparison result is that the flow rate of the industrial waste heat waste water is not less than the flow rate threshold and the temperature of the industrial waste heat waste water is not less than the temperature threshold, the waste heat source heating mode is adopted.

[0008] Optionally, the system further comprises an air source heating pipeline, the air source heating pipeline comprises an air source evaporator, the cold fluid outlet of the vortex tube is connected to the inlet of the air source evaporator, and a first solenoid valve is provided between the cold fluid outlet of the vortex tube and the inlet of the air source evaporator; The step of flowing the heated carbon dioxide through the vortex tube to the desuperheater and supplying water to the second preset temperature for heat exchange to obtain hot water that meets the heating requirements of the sewage treatment section includes: The heated carbon dioxide flows into the inlet of the vortex tube and is divided into carbon dioxide at the cold fluid outlet of the vortex tube and carbon dioxide at the hot fluid outlet of the vortex tube after throttling inside the vortex tube; If the current heating mode is the air source heating mode, the first solenoid valve is opened to allow the carbon dioxide at the cold fluid outlet of the vortex tube to flow to the air source evaporator, where it absorbs the heat of the industrial waste heat wastewater and then flows into the regenerator; The carbon dioxide at the hot fluid outlet of the vortex tube flows to the desuperheater and is supplied to the second preset temperature water for heat exchange, thereby obtaining hot water that meets the heating requirements of the sewage treatment section.

[0009] Optionally, the system further includes a waste heat source heat supply pipeline, the waste heat source heat supply pipeline includes a waste heat source evaporator, the cold fluid outlet of the vortex tube is connected to the inlet of the waste heat source evaporator, and a second solenoid valve is provided between the cold fluid outlet of the vortex tube and the inlet of the waste heat source evaporator; The step of flowing the heated carbon dioxide through the vortex tube to the desuperheater and supplying water to the second preset temperature for heat exchange to obtain hot water that meets the heating requirements of the sewage treatment section includes: The heated carbon dioxide flows into the inlet of the vortex tube and is divided into carbon dioxide at the cold fluid outlet of the vortex tube and carbon dioxide at the hot fluid outlet of the vortex tube after throttling inside the vortex tube; If the current heating mode is the waste heat source heating mode, the second solenoid valve is opened to allow the carbon dioxide at the cold fluid outlet of the vortex tube to flow to the waste heat source evaporator, absorb the heat from the industrial waste heat wastewater, and then flow into the regenerator; The carbon dioxide at the hot fluid outlet of the vortex tube flows to the desuperheater and is supplied to the second preset temperature water for heat exchange, thereby obtaining hot water that meets the heating requirements of the sewage treatment section.

[0010] Optionally, the air source heating pipeline further comprises a first throttle valve, wherein the first throttle valve is located between the cold fluid outlet of the vortex tube and the inlet of the air source evaporator; If the current heating mode is the air source heating mode, the step of opening the first solenoid valve to allow the carbon dioxide at the cold fluid outlet of the vortex tube to flow to the air source evaporator, absorb the heat of the industrial waste heat wastewater, and then flow into the regenerator includes: If the current heating mode is the air source heating mode, the first solenoid valve is opened, and the opening of the first throttle valve is adjusted according to the difference between the outlet temperature of the air source evaporator and the preset outlet temperature; Based on the opening degree of the first throttle valve, the carbon dioxide at the cold fluid outlet of the vortex tube flows to the air source evaporator, absorbs the heat of the industrial waste heat wastewater, and then flows into the regenerator.

[0011] Optionally, the waste heat source heat supply pipeline further includes a second throttle valve, which is located between the cold fluid outlet of the vortex tube and the inlet of the waste heat source evaporator; If the current heating mode is the waste heat source heating mode, the step of opening the second solenoid valve to allow the carbon dioxide at the cold fluid outlet of the vortex tube to flow to the waste heat source evaporator, absorb the heat of the industrial waste heat wastewater, and then flow into the regenerator includes: If the current heating mode is the waste heat source heating mode, the second solenoid valve is opened, and the opening of the second throttle valve is adjusted according to the difference between the outlet pressure of the waste heat source evaporator and the preset outlet pressure; Based on the opening degree of the second throttle valve, the carbon dioxide at the cold fluid outlet of the vortex tube flows to the waste heat source evaporator, absorbs the heat of the industrial waste heat wastewater, and then flows into the regenerator.

[0012] Optionally, the desuperheating and cooling pipeline further includes a first adjustable valve, which is located between the hot fluid outlet of the vortex tube and the inlet of the desuperheating and cooling device; The method further comprises: adjusting the opening of the first adjustable valve according to the difference between the temperature of the hot fluid outlet of the vortex tube and a preset temperature of the hot fluid outlet; The ratio of the carbon dioxide at the cold fluid outlet of the vortex tube to the carbon dioxide at the hot fluid outlet of the vortex tube is adjusted based on the opening degree of the first adjustable valve.

[0013] In addition, to achieve the above-mentioned objectives, the present invention further provides a heating control device for a multi-stage heating system. The device is applied to the multi-stage heating system. The system includes a cooling circulation pipeline and a desuperheating and cooling pipeline. The cooling circulation pipeline includes a compressor, a high-temperature cooler, an intermediate-temperature cooler, and a regenerator. The desuperheating and cooling pipeline includes a vortex tube and a desuperheating and cooling pipeline. The hot fluid outlet of the vortex tube is connected to the inlet of the desuperheating and cooling pipeline. The regenerator is connected to the vortex tube. The device includes: a compression control module, configured to control the compressor to compress the carbon dioxide to obtain compressed carbon dioxide; a high-temperature cooling module for transferring the compressed carbon dioxide to the high-temperature cooler for heat exchange with water supplied at a first preset temperature, thereby obtaining hot water meeting the heating requirements of the hot wash section of the oil well and the exothermic carbon dioxide; A medium-temperature cooling module is used to transfer the exothermic carbon dioxide to the medium-temperature cooler and the second preset temperature water supply for heat exchange, thereby obtaining hot water that meets the heating requirements of the crude oil transportation section and the carbon dioxide after secondary exothermicity; The desuperheating and cooling module is used to heat the carbon dioxide after the secondary heat release through the regenerator, and the heated carbon dioxide flows to the desuperheating and cooling device through the vortex tube, and exchanges heat with the second preset temperature water supply to obtain hot water that meets the heating requirements of the sewage treatment section.

[0014] In addition, to achieve the above-mentioned objectives, the present invention also proposes a heating control device for a multi-stage heating system, the device comprising: a memory, a processor, and a heating control program for a multi-stage heating system stored in the memory and executable on the processor, the heating control program for the multi-stage heating system being configured to implement the steps of the heating control method for a multi-stage heating system as described above.

[0015] In addition, to achieve the above-mentioned purpose, the present invention also proposes a storage medium, on which a heating control program of a multi-stage heating system is stored. When the heating control program of the multi-stage heating system is executed by a processor, the steps of the heating control method of the multi-stage heating system as described above are implemented.

[0016] The present application discloses a heat supply control method for a multi-stage heat tracing system. The method is applied to the multi-stage heat tracing system, wherein the system includes a cooling circulation pipeline and a desuperheating and cooling pipeline. The cooling circulation pipeline includes a compressor, a high-temperature cooler, an intermediate-temperature cooler, and a regenerator. The desuperheating and cooling pipeline includes a vortex tube and a desuperheating and cooling pipeline. The hot fluid outlet of the vortex tube is connected to the inlet of the desuperheating and cooling pipeline, and the regenerator is connected to the vortex tube. The method includes: controlling the compressor to compress carbon dioxide to obtain compressed carbon dioxide; directing the compressed carbon dioxide to the high-temperature cooler for heat exchange with a first preset temperature supply water to obtain hot water meeting the heating requirements of the oil well hot wash section and the heat-released carbon dioxide; directing the heat-released carbon dioxide to the intermediate-temperature cooler and the second preset temperature supply water for heat exchange to obtain hot water meeting the heating requirements of the crude oil transportation section and the heat-released carbon dioxide; heating the heat-released carbon dioxide through the regenerator, and directing the heated carbon dioxide through the vortex tube to the desuperheating and cooling pipeline and heat-exchanging with the second preset temperature supply water to obtain hot water meeting the heating requirements of the sewage treatment section. Compared with the existing technology, this application introduces a vortex tube into a transcritical carbon dioxide heat pump system and adopts a two-stage cooler. The extra heating capacity of the vortex tube is fully utilized through a desuperheating cooler, thereby meeting the three-stage water temperature requirement, reducing the energy consumption in the heating process of the multi-stage heating system of the crude oil process, and improving the resource utilization efficiency of the oil industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a flow chart of a first embodiment of a method for controlling heating of a multi-stage heating system according to the present invention; Figure 2 Schematic diagram of the structure of a multi-stage heating system in a heating control method of a multi-stage heating system of the present invention; Figure 3 This is a flow chart of a second embodiment of a method for controlling heating of a multi-stage heating system according to the present invention; Figure 4 This is a structural block diagram of a first embodiment of a heating control device for a multi-stage heating system according to the present invention; Figure 5 It is a structural diagram of a heating control device of a multi-stage heating system in a hardware operating environment involved in an embodiment of the present invention.

[0018] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0019] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0021] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0022] In addition, the descriptions of "first", "second", etc. in this application are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0023] The embodiment of the present invention provides a heating control method for a multi-stage heating system, referring to Figure 1 , Figure 1 1 is a flow chart of a first embodiment of a method for controlling heating of a multi-stage heating system according to the present invention.

[0024] In this embodiment, the heat supply control method of the multi-stage heat tracing system is applied to the multi-stage heat tracing system, wherein the system includes a cooling circulation pipeline and a desuperheating and cooling pipeline, the cooling circulation pipeline includes a compressor, a high-temperature cooler, an intermediate-temperature cooler, and a regenerator, the desuperheating and cooling pipeline includes a vortex tube and a desuperheating and cooling pipeline, the hot fluid outlet of the vortex tube is connected to the inlet of the desuperheating and cooling pipeline, and the regenerator is connected to the vortex tube; the method includes steps S10 to S40: Step S10: controlling the compressor to compress the carbon dioxide to obtain compressed carbon dioxide.

[0025] It should be noted that the execution entity of this embodiment can be a computer server device with data processing, network communication, and program execution functions used in industrial heat pump scenarios, such as a server, tablet computer, or personal computer, or an electronic device capable of performing the above functions (such as a heating control device for a multi-stage heating system). The following uses the heating control device for a multi-stage heating system as an example to illustrate this embodiment and the following embodiments.

[0026] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of a multi-stage heating system in a heat supply control method for a multi-stage heating system according to the present invention. The multi-stage heating system includes a cooling circulation pipeline and a desuperheating and cooling pipeline. The cooling circulation pipeline includes a compressor 1, a high-temperature cooler 2, an intermediate-temperature cooler 3, and a regenerator 8. The desuperheating and cooling pipeline includes a vortex tube 4 and a desuperheating and cooling device 7.

[0027] Among them, the compressor 1 is provided with an air inlet and an exhaust port, the vortex tube 4 is provided with an inlet, a cold fluid outlet and a hot fluid outlet, the high-temperature cooler 2, the medium-temperature cooler 3, the desuperheating cooler 7 and the regenerator 8 are all provided with an inlet and an outlet; the outlet of the compressor 1 is connected to the inlet of the high-temperature cooler 2; the outlet of the high-temperature cooler 2 is connected to the inlet of the medium-temperature cooler 3; the outlet of the medium-temperature cooler 3 is connected to the high-pressure end inlet of the regenerator 8; the high-pressure end outlet of the regenerator 8 is connected to the inlet of the vortex tube 4; the hot fluid outlet of the vortex tube 4 is connected to the inlet of the desuperheating cooler 7; the low-pressure end outlet of the regenerator 8 is connected to the air inlet of the compressor 1.

[0028] It should be noted that it is possible to determine whether the heat supply from the waste heat source is sufficient; if not, the system adopts the air source heating mode; if sufficient, the system adopts the waste heat source heating mode.

[0029] It should be understood that the above-mentioned multi-stage heating system can be a vortex tube introduced into the transcritical In heat pump systems, the energy efficiency of the system is improved by using transcritical Multi-stage heating system for crude oil process using circulating vortex tube technology.

[0030] Step S20: The compressed carbon dioxide is directed to the high-temperature cooler and is subjected to heat exchange with water supplied at a first preset temperature to obtain hot water meeting the heating requirements of the oil well hot wash section and the exothermic carbon dioxide.

[0031] It is understandable that the first preset temperature water supply may be 60° C. water supply or other temperatures. This embodiment and the following embodiments are described using 60° C. water supply as an example.

[0032] It should be noted that the hot washing section of the oil well has a heating requirement of 70~100°C. The water temperature of the hot washing manifold in the metering room needs to reach above 75°C before hot washing can be carried out to ensure that the hot washing liquid can effectively dissolve the accumulated wax. In this embodiment and the following embodiments, the hot water that meets the heating requirement of the hot washing section of the oil well is explained by taking 95°C hot water as an example.

[0033] In a specific implementation, the high-temperature and high-pressure carbon dioxide ( ) flows to the high-temperature cooler 2 and exchanges heat with the first preset temperature water supply (for example, 60°C water supply), which is heated to 95°C for the oil well hot washing process, that is, hot water that meets the heating requirements of the oil well hot washing section and the exothermic carbon dioxide are obtained.

[0034] Step S30: the carbon dioxide after heat release is directed to the medium-temperature cooler and the water supply at the second preset temperature for heat exchange, thereby obtaining hot water meeting the heating requirements of the crude oil transportation section and the carbon dioxide after secondary heat release.

[0035] It is understandable that the second preset temperature water supply can be room temperature water supply or water supply at other temperatures. This embodiment and the following embodiments are described using room temperature water supply as an example.

[0036] It should be noted that the crude oil transportation section requires heating at 40-60°C to prevent crude oil from solidifying at low temperatures and inhibit wax crystal precipitation, especially for highly waxy or high-viscosity crude oil, thereby ensuring smooth oil transportation. In this embodiment and the following embodiments, the hot water meeting the heating requirements of the crude oil transportation section is described using 60°C as an example.

[0037] Step S40: The carbon dioxide after the secondary heat release is heated by the regenerator, and the heated carbon dioxide flows to the desuperheater through the vortex tube, and is supplied to the second preset temperature water for heat exchange to obtain hot water that meets the heating requirements of the sewage treatment section.

[0038] It should be noted that the system also includes an air source heating pipeline, which includes an air source evaporator 5. The cold fluid outlet of the vortex tube 4 is connected to the inlet of the air source evaporator 5. A first solenoid valve 14 is provided between the cold fluid outlet of the vortex tube 4 and the inlet of the air source evaporator 5.

[0039] Correspondingly, step S40 includes: flowing the heated carbon dioxide into the inlet of the vortex tube, and dividing it into carbon dioxide at the cold fluid outlet of the vortex tube and carbon dioxide at the hot fluid outlet of the vortex tube after throttling inside the vortex tube; if the current heating mode is the air source heating mode, opening the first solenoid valve, and flowing the carbon dioxide at the cold fluid outlet of the vortex tube to the air source evaporator, absorbing the heat of the industrial waste heat wastewater and then flowing into the regenerator; flowing the carbon dioxide at the hot fluid outlet of the vortex tube to the desuperheater, and supplying water to the second preset temperature for heat exchange, to obtain hot water that meets the heating requirements of the sewage treatment section.

[0040] In addition, the system also includes a waste heat source heating pipeline, which includes a waste heat source evaporator 6. The cold fluid outlet of the vortex tube 4 is connected to the inlet of the waste heat source evaporator 6. A second solenoid valve 15 is provided between the cold fluid outlet of the vortex tube 4 and the inlet of the waste heat source evaporator 6.

[0041] Correspondingly, step S40 includes: the step of allowing the heated carbon dioxide to flow through the vortex tube to the desuperheating cooler, and supplying water to the second preset temperature for heat exchange to obtain hot water that meets the heating requirements of the sewage treatment section, including: allowing the heated carbon dioxide to flow into the inlet of the vortex tube, and after throttling inside the vortex tube, it is divided into carbon dioxide at the cold fluid outlet of the vortex tube and carbon dioxide at the hot fluid outlet of the vortex tube; if the current heating mode is the waste heat source heating mode, opening the second solenoid valve, and allowing the carbon dioxide at the cold fluid outlet of the vortex tube to flow to the waste heat source evaporator, absorb the heat of the industrial waste heat wastewater, and then flow into the regenerator; allowing the carbon dioxide at the hot fluid outlet of the vortex tube to flow to the desuperheating cooler, and supplying water to the second preset temperature for heat exchange to obtain hot water that meets the heating requirements of the sewage treatment section.

[0042] It should be supplemented that the air source heating pipeline also includes a fan 9 for providing an air source.

[0043] It should be noted that the regenerator 8 is provided with a high-pressure inlet and a high-pressure outlet, as well as a low-pressure inlet and a low-pressure outlet. The outlet of the medium-temperature cooler 3 is connected to the high-pressure inlet of the regenerator 8; the high-pressure outlet of the regenerator 8 is connected to the inlet of the vortex tube 4; the cold fluid outlet of the vortex tube 4 is connected to the inlet of the air source evaporator 5 or the inlet of the waste heat source evaporator 6; the hot fluid outlet of the vortex tube 4 is connected to the inlet of the desuperheater 7; the outlet of the desuperheater 7 and the outlet of the air source evaporator 5 or the outlet of the waste heat source evaporator 6 are collectively connected to the low-pressure inlet of the regenerator 8, and the low-pressure outlet of the regenerator 8 is connected to the air inlet of the compressor 1.

[0044] In the specific implementation, when the heat supply of the waste heat source is insufficient and the air source is used for heating, that is, the system adopts the air source heating mode, the first solenoid valve 14 is fully opened, the second solenoid valve 15 is closed, and the fan 9 is turned on. At this time, the high-temperature and high-pressure gas compressed by the compressor 1 is It flows to high temperature cooler 2 and exchanges heat with 60℃ water, heating it to 95℃ for oil well hot washing process. It then flows into the medium temperature cooler 3 and exchanges heat with the normal temperature water, heating it to 60°C. A portion of the water is used to heat the crude oil pipeline. Flowing into the regenerator 8 and the low pressure end of the regenerator 8 Heat exchange releases heat again, and then flows into the inlet of the vortex tube 4. After throttling inside the vortex tube 4, it is divided into two streams. The cold fluid outlet Flows to the air source evaporator 5, absorbs the heat of the waste heat waste water, and then flows into the regenerator 8; the hot fluid outlet of the vortex tube 4 In the desuperheater 7, the room temperature water is heated to 40°C and enters the sewage treatment system. After the heat release is completed, the water is heated to 40°C and then enters the sewage treatment system. The air is then reunited and flows into the low-pressure inlet of the regenerator 8 to absorb heat and increase in temperature, and then returns to the air inlet of the compressor 1.

[0045] When the waste heat source is sufficient, that is, the system adopts the waste heat source heating mode, the second solenoid valve 15 is fully opened and the first solenoid valve 14 is closed. It flows to high temperature cooler 2 and exchanges heat with 60℃ water, heating it to 95℃ for oil well hot washing process. It then flows into the medium temperature cooler 3 and exchanges heat with the normal temperature water, heating it to 60°C. A portion of the water is used to heat the crude oil pipeline. Flowing into the regenerator 8 and the low pressure end of the regenerator 8 Heat exchange releases heat again, and then flows into the inlet of the vortex tube 4. After throttling inside the vortex tube 4, it is divided into two streams. The cold fluid outlet Flows to the waste heat source evaporator 6, absorbs the heat of the waste heat waste water, and then flows into the regenerator 8; the hot fluid outlet of the vortex tube 4 In the desuperheater 7, the water at room temperature is heated to 40°C and enters the sewage treatment system. After the heat release is completed, the water is heated to 40°C and then enters the sewage treatment system. The air is then reunited and flows into the low-pressure end of the regenerator 8 to absorb heat and increase in temperature, and then returns to the air inlet of the compressor 1.

[0046] It should be understood that the present system introduces the vortex tube into the transcritical In a heat pump system, this improves the system's energy efficiency. Furthermore, a two-stage gas cooler (high-temperature cooler 2 and medium-temperature cooler 3) is employed, and the desuperheater 7 fully utilizes the additional heating capacity of the vortex tube 4 to meet the three-stage water temperature requirements. This system switches the heat source (i.e., between waste heat source and air source heating modes) by opening and closing solenoid valves (first solenoid valve 14 and second solenoid valve 15), adapting to varying operating conditions and ensuring sufficient heating while maximizing the utilization of industrial waste heat. This improves the system's applicability and flexibility.

[0047] This embodiment discloses a heat supply control method for a multi-stage heat tracing system. The method is applied to the multi-stage heat tracing system. The system includes a cooling circulation pipeline and a desuperheating and cooling pipeline. The cooling circulation pipeline includes a compressor, a high-temperature cooler, an intermediate-temperature cooler, and a regenerator. The desuperheating and cooling pipeline includes a vortex tube and a desuperheating and cooling pipeline. The hot fluid outlet of the vortex tube is connected to the inlet of the desuperheating and cooling pipeline, and the regenerator is connected to the vortex tube. The method includes: controlling the compressor to compress carbon dioxide to obtain compressed carbon dioxide; directing the compressed carbon dioxide to the high-temperature cooler for heat exchange with a first preset temperature supply water to obtain hot water meeting the heating requirements of the oil well hot wash section and the exothermic carbon dioxide; directing the exothermic carbon dioxide to the intermediate-temperature cooler for heat exchange with a second preset temperature supply water to obtain hot water meeting the heating requirements of the crude oil transportation section and the carbon dioxide after secondary heat release; heating the carbon dioxide after secondary heat release through the regenerator, and directing the heated carbon dioxide through the vortex tube to the desuperheating and cooling pipeline and exchanging heat with the second preset temperature supply water to obtain hot water meeting the heating requirements of the sewage treatment section. Compared with the existing technology, this embodiment introduces a vortex tube into the transcritical carbon dioxide heat pump system and adopts a two-stage cooler. The extra heating capacity of the vortex tube is fully utilized through the desuperheating desuperheater, thereby meeting the three-stage water temperature requirement, reducing the energy consumption in the heating process of the multi-stage heating system of the crude oil process, and improving the resource utilization efficiency of the oil industry.

[0048] refer to Figure 3 , Figure 3 2 is a flow chart of a second embodiment of a method for controlling heating of a multi-stage heating system according to the present invention.

[0049] Based on the first embodiment above, in this embodiment, before step S10, steps S01 to S03 are further included: Step S01: detecting the flow rate and temperature of industrial waste heat waste water, and comparing the flow rate and temperature of the industrial waste heat waste water with a flow rate threshold and a temperature threshold respectively to obtain a comparison result.

[0050] Step S02: If the comparison result is that the flow rate of the industrial waste heat wastewater is less than the flow rate threshold or the temperature of the industrial waste heat wastewater is less than the temperature threshold, the air source heating mode is adopted.

[0051] Step S03: If the comparison result is that the flow rate of the industrial waste heat wastewater is not less than the flow rate threshold and the temperature of the industrial waste heat wastewater is not less than the temperature threshold, the waste heat source heating mode is adopted.

[0052] It should be noted that the multi-stage heat tracing system further includes a bypass pipeline, and the bypass pipeline includes a bypass valve 13. The bypass valve 13 can achieve adaptive adjustment of the heat recovery rate by adjusting its own opening.

[0053] It should be supplemented that the air source heating pipeline further includes a first throttle valve 11 , which is located between the cold fluid outlet of the vortex tube 4 and the inlet of the air source evaporator 5 .

[0054] Correspondingly, if the current heating mode is the air source heating mode, the first solenoid valve is opened, and the carbon dioxide at the cold fluid outlet of the vortex tube flows to the air source evaporator, absorbs the heat of the industrial waste heat wastewater and then flows into the regenerator. The step includes: if the current heating mode is the air source heating mode, the first solenoid valve is opened, and the opening of the first throttle valve is adjusted according to the difference between the outlet temperature of the air source evaporator and the preset outlet temperature; based on the opening of the first throttle valve, the carbon dioxide at the cold fluid outlet of the vortex tube flows to the air source evaporator, absorbs the heat of the industrial waste heat wastewater and then flows into the regenerator.

[0055] It should be supplemented that the waste heat source heating pipeline further includes a second throttle valve 12 , which is located between the cold fluid outlet of the vortex tube 4 and the inlet of the waste heat source evaporator 6 .

[0056] Correspondingly, if the current heating mode is the waste heat source heating mode, the second solenoid valve is opened, and the carbon dioxide at the cold fluid outlet of the vortex tube flows to the waste heat source evaporator, absorbs the heat of the industrial waste heat wastewater and then flows into the regenerator. The step includes: if the current heating mode is the waste heat source heating mode, the second solenoid valve is opened, and the opening of the second throttle valve is adjusted according to the difference between the outlet pressure of the waste heat source evaporator and the preset outlet pressure; based on the opening of the second throttle valve, the carbon dioxide at the cold fluid outlet of the vortex tube flows to the waste heat source evaporator, absorbs the heat of the industrial waste heat wastewater and then flows into the regenerator.

[0057] It should be noted that the desuperheating and cooling pipeline further includes a first adjustable valve 10 , which is located between the hot fluid outlet of the vortex tube 4 and the inlet of the desuperheating and cooling device 7 .

[0058] The method further includes: adjusting the opening of the first adjustable valve according to the difference between the temperature of the hot fluid outlet of the vortex tube and a preset temperature of the hot fluid outlet; and adjusting the ratio of the carbon dioxide at the cold fluid outlet of the vortex tube to the carbon dioxide at the hot fluid outlet of the vortex tube based on the opening of the first adjustable valve.

[0059] It should be understood that PID can be used to control target quantities: the system exhaust pressure is regulated by adjusting the speed of compressor 1, thereby optimizing system operating performance; the heat recovery rate is adaptively adjusted by adjusting the opening of bypass valve 13, and the ratio of the hot and cold fluids in vortex tube 4 is controlled by first adjustable valve 10, thereby ensuring the stability of the system's outlet water temperature; when the air source is providing heat, the intake air temperature is adjusted by first throttle valve 11, and when the waste heat source is providing heat, the intake air pressure is adjusted by second throttle valve 12, thereby ensuring the stability of system operation. Through the coupled control of multiple PIDs, rapid system response and efficient system operation are achieved.

[0060] In the specific implementation, if it is air source heating mode, during operation, according to the exhaust pressure and set the air humidity The deviation between Change the speed of compressor 1, when >1barA, reduce the speed of compressor 1. <-1barA, increase the speed of compressor 1. When -1barA< <1barA, the opening of the first adjustable valve 10 remains unchanged; according to the temperature of the hot fluid outlet and set temperature The deviation between Change the opening of the first adjustable valve 10, when >3℃, increase the opening of the first adjustable valve 10, when <-3℃, reduce the opening of the first adjustable valve 10. When -3℃< <3℃, the opening of the first adjustable valve 10 remains unchanged; according to the exhaust temperature and set exhaust temperature The deviation between Change the opening of the bypass valve 13, when >3℃, increase the opening of bypass valve 13 and reduce the heat recovery rate. <-3℃, reduce the opening of bypass valve 13 and increase the heat recovery rate. <3℃, the opening of the bypass valve 13 remains unchanged; according to the outlet temperature of the air source evaporator 5 and set temperature The deviation between Change the opening of the first throttle valve 11, when >3℃, increase the opening of the first throttle valve 11, when <-3℃, reduce the opening of the first throttle valve 11. When -3℃< <3°C, the opening of the first throttle valve 11 remains unchanged, thereby ensuring the stability of system operation.

[0061] If it is the waste heat source heating mode, during operation, according to the exhaust pressure and set the air humidity The deviation between Change the speed of compressor 1, when >1barA, reduce the speed of compressor 1. <-1barA, increase the speed of compressor 1. When -1barA< <1barA, the opening of the first adjustable valve 10 remains unchanged; according to the temperature of the hot fluid outlet and set temperature The deviation between Change the opening of the first adjustable valve 10, when >3℃, increase the opening of the first adjustable valve 10, when <-3℃, reduce the opening of the first adjustable valve 10. When -3℃< <3℃, the opening of the first adjustable valve 10 remains unchanged; according to the exhaust temperature and set exhaust temperature The deviation between Change the opening of the bypass valve 13, when >3℃, increase the opening of bypass valve 13 and reduce the heat recovery rate. <-3℃, reduce the opening of bypass valve 13 and increase the heat recovery rate. <3℃, the opening of the bypass valve 13 remains unchanged; according to the outlet pressure of the waste heat source evaporator 6 and set pressure The deviation between Change the opening of the second throttle valve 12, when >1barA, increase the opening of the second throttle valve 12, when <-1barA, reduce the opening of the second throttle valve 12. When -1barA< <1 barA, the opening of the second throttle valve 12 remains unchanged, thereby ensuring the stability of system operation.

[0062] It should be understood that 1 barA can be a parameter with an allowable error range for control. Within the range, control can be considered in place and the current parameter state can be maintained. If it exceeds or falls below this range, corresponding adjustments need to be made to ensure good operating results.

[0063] Specifically, the exhaust temperature is determined based on the water flow requirement and refrigerant flow , hot fluid outlet temperature , thus ensuring the response of the three-level outlet water temperature, and The corresponding optimization formulas are: ; .

[0064] in, The water output requirement is 95℃. is the water output requirement at 40℃, m is the refrigerant mass flow rate, , , , , , These are all constant coefficients and can be determined according to the actual system.

[0065] Furthermore, the suction pressure , the outlet refrigerant temperature of the intermediate temperature cooler 3 determines the optimal exhaust pressure , The corresponding optimization formula is: ; in, is the CO2 temperature at the outlet of the intermediate temperature cooler 3, , , , These are all constant coefficients and can be determined according to the actual system.

[0066] Furthermore, the waste heat source temperature Determine the outlet temperature of the air source evaporator 5 (air source heating) or suction pressure (waste heat source heating), and The corresponding optimization formula is: ; .

[0067] in, is the saturation pressure corresponding to the waste heat source temperature (the upper limit is the critical pressure), , , , These are all constant coefficients and can be determined according to the actual system.

[0068] This embodiment discloses detecting the flow rate and temperature of industrial waste heat wastewater, and comparing the flow rate and temperature of the industrial waste heat wastewater with the flow rate threshold and the temperature threshold respectively to obtain a comparison result; if the comparison result is that the flow rate of the industrial waste heat wastewater is less than the flow rate threshold or the temperature of the industrial waste heat wastewater is less than the temperature threshold, then the air source heating mode is adopted; if the comparison result is that the flow rate of the industrial waste heat wastewater is not less than the flow rate threshold and the temperature of the industrial waste heat wastewater is not less than the temperature threshold, then the waste heat source heating mode is adopted. Compared with the prior art, this embodiment selects the heat source according to the temperature and flow status of the waste heat wastewater, adapts to different working conditions, ensures sufficient heating on the basis of making full use of industrial waste heat as much as possible, and improves the applicability and flexibility of the system.

[0069] In addition, an embodiment of the present invention further proposes a storage medium, on which a heating control program for a multi-stage heating system is stored. When the heating control program for the multi-stage heating system is executed by a processor, the steps of the heating control method for the multi-stage heating system as described above are implemented.

[0070] Reference Figure 4 , Figure 4 This is a structural block diagram of a first embodiment of a heating control device for a multi-stage heating system according to the present invention.

[0071] like Figure 4 As shown, the heating control device of the multi-stage heating system proposed in the embodiment of the present invention is applied to the multi-stage heating system, the system includes a cooling circulation pipeline and a superheating and cooling pipeline, the cooling circulation pipeline includes a compressor, a high-temperature cooler, an intermediate-temperature cooler and a regenerator, the superheating and cooling pipeline includes a vortex tube and a superheating and cooling module, the hot fluid outlet of the vortex tube is connected to the inlet of the superheating and cooling module, and the regenerator is connected to the vortex tube. The device includes: a compression control module 501, a high-temperature cooling module 502, a intermediate-temperature cooling module 503 and a superheating and cooling module 504.

[0072] The compression control module 501 is used to control the compressor to compress carbon dioxide to obtain compressed carbon dioxide.

[0073] The high-temperature cooling module 502 is used to flow the compressed carbon dioxide to the high-temperature cooler for heat exchange with the first preset temperature water supply to obtain hot water that meets the heating requirements of the oil well hot wash section and the exothermic carbon dioxide.

[0074] The medium-temperature cooling module 503 is used to transfer the heat-released carbon dioxide to the medium-temperature cooler and the second preset temperature water supply for heat exchange, thereby obtaining hot water that meets the heating requirements of the crude oil transportation section and the carbon dioxide that has been heat-released twice.

[0075] The desuperheating and cooling module 504 is used to heat the carbon dioxide after the secondary heat release through the regenerator, and flow the heated carbon dioxide to the desuperheating and cooling device through the vortex tube, and supply water to the second preset temperature for heat exchange to obtain hot water that meets the heating requirements of the sewage treatment section.

[0076] This embodiment discloses a heat supply control device for a multi-stage heat tracing system. The device is applied to the multi-stage heat tracing system. The system includes a cooling circulation pipeline and a desuperheating and cooling pipeline. The cooling circulation pipeline includes a compressor, a high-temperature cooler, an intermediate-temperature cooler, and a regenerator. The desuperheating and cooling pipeline includes a vortex tube and a desuperheating and cooling pipeline. The hot fluid outlet of the vortex tube is connected to the inlet of the desuperheating and cooling pipeline, and the regenerator is connected to the vortex tube. The method includes: controlling the compressor to compress carbon dioxide to obtain compressed carbon dioxide; directing the compressed carbon dioxide to the high-temperature cooler for heat exchange with a first preset temperature supply water to obtain hot water meeting the heating requirements of the oil well hot wash section and the exothermic carbon dioxide; directing the exothermic carbon dioxide to the intermediate-temperature cooler for heat exchange with a second preset temperature supply water to obtain hot water meeting the heating requirements of the crude oil transportation section and the carbon dioxide after secondary heat release; heating the carbon dioxide after secondary heat release through the regenerator, and directing the heated carbon dioxide through the vortex tube to the desuperheating and cooling pipeline and exchanging heat with the second preset temperature supply water to obtain hot water meeting the heating requirements of the sewage treatment section. Compared with the existing technology, this embodiment introduces a vortex tube into the transcritical carbon dioxide heat pump system and adopts a two-stage cooler. The extra heating capacity of the vortex tube is fully utilized through the desuperheating desuperheater, thereby meeting the three-stage water temperature requirement, reducing the energy consumption in the heating process of the multi-stage heating system of the crude oil process, and improving the resource utilization efficiency of the oil industry.

[0077] Based on the first embodiment of the heating control device for a multi-stage heating system of the present invention, a second embodiment of the heating control device for a multi-stage heating system of the present invention is proposed.

[0078] In this embodiment, the compression control module 501 is also used to detect the flow rate and temperature of industrial waste heat wastewater, and compare the flow rate and temperature of the industrial waste heat wastewater with the flow threshold and temperature threshold respectively to obtain a comparison result; if the comparison result is that the flow rate of the industrial waste heat wastewater is less than the flow threshold or the temperature of the industrial waste heat wastewater is less than the temperature threshold, the air source heating mode is adopted; if the comparison result is that the flow rate of the industrial waste heat wastewater is not less than the flow threshold and the temperature of the industrial waste heat wastewater is not less than the temperature threshold, the waste heat source heating mode is adopted.

[0079] Other embodiments or specific implementations of the heating control device of the multi-stage heating system of the present invention can refer to the above-mentioned method embodiments and will not be repeated here.

[0080] The present application provides a heating control device for a multi-stage heating system, the heating control device for the multi-stage heating system comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the heating control method for the multi-stage heating system in the above-mentioned embodiment 1.

[0081] Reference below Figure 5 , which shows a schematic diagram of the structure of a heating control device suitable for implementing a multi-stage heating system according to an embodiment of the present application. The heating control device for the multi-stage heating system according to an embodiment of the present application may include, but is not limited to, mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 5 The heating control device of the multi-stage heating system shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0082] like Figure 5As shown, the heating control device for a multi-stage heating system may include a processing device 1001 (e.g., a central processing unit, graphics processing unit, etc.), which can execute various appropriate actions and processes based on programs stored in a read-only memory 1002 or programs loaded from a storage device 1003 into a random access memory 1004. The random access memory 1004 also stores various programs and data required for the operation of the heating control device for the multi-stage heating system. The processing device 1001, the read-only memory 1002, and the random access memory 1004 are interconnected via a bus 1005. An input / output interface 1006 is also connected to the bus. Typically, the following systems may be connected to the input / output interface 1006: an input device 1007 including, for example, a touchscreen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; a storage device 1003 including, for example, a magnetic tape or hard disk; and a communication device 1009. The communication device 1009 can allow the heating control device of the multi-stage heating system to communicate with other devices wirelessly or by wire to exchange data. Although the figure shows the heating control device of the multi-stage heating system with various systems, it should be understood that it is not required to implement or have all of the systems shown. More or fewer systems may be implemented or have alternatively.

[0083] In particular, according to the embodiments disclosed in the present application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, the embodiments disclosed in the present application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program comprising program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via a communication device, or installed from a storage device 1003, or installed from a read-only memory 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are performed.

[0084] The heating control device for a multi-stage heating system provided in this application utilizes the heating control method for a multi-stage heating system in the aforementioned embodiment, addressing the technical issues of significant energy consumption and inefficient waste heat utilization during the heating process of a multi-stage heating system in a crude oil process in the prior art. Compared to the prior art, the beneficial effects of the heating control device for a multi-stage heating system provided in this application are the same as those of the heating control method for a multi-stage heating system provided in the aforementioned embodiment. The other technical features of the heating control device for a multi-stage heating system are the same as those disclosed in the aforementioned embodiment and are not further elaborated upon here.

[0085] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0086] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

[0087] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or system comprising the element.

[0088] The serial numbers of the above embodiments of the present invention are for description only and do not represent the advantages or disadvantages of the embodiments.

[0089] Through the above description of the embodiments, those skilled in the art will clearly understand that the above-mentioned embodiments and methods can be implemented by means of software plus the necessary general-purpose hardware platform. Of course, hardware can also be used, but in many cases the former is a more preferred embodiment. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as read-only memory / random access memory, a magnetic disk, or an optical disk) and includes a number of instructions for enabling a terminal device (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0090] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A heating control method for a multi-stage heating system, characterized in that: The method is applied to a multi-stage heat tracing system, wherein the system includes a cooling circulation pipeline and a desuperheating and cooling pipeline, wherein the cooling circulation pipeline includes a compressor, a high-temperature cooler, a medium-temperature cooler, and a regenerator, wherein the desuperheating and cooling pipeline includes a vortex tube and a desuperheating and cooling pipeline, wherein a hot fluid outlet of the vortex tube is connected to an inlet of the desuperheating and cooling pipeline, and the regenerator is connected to the vortex tube; The method comprises: controlling the compressor to compress the carbon dioxide to obtain compressed carbon dioxide; The compressed carbon dioxide is fed to the high-temperature cooler and heat-exchanged with water supplied at a first preset temperature to obtain hot water that meets the heating requirements of the hot wash section of the oil well and the exothermic carbon dioxide; The carbon dioxide after heat release flows to the medium-temperature cooler and the second preset temperature water supply for heat exchange, thereby obtaining hot water that meets the heating requirements of the crude oil transportation section and the carbon dioxide after secondary heat release; The carbon dioxide after the secondary heat release is heated by the regenerator, and the heated carbon dioxide flows to the desuperheater through the vortex tube, and is supplied to the second preset temperature water for heat exchange to obtain hot water that meets the heating requirements of the sewage treatment section.

2. The heating control method of the multi-stage heating system according to claim 1, characterized in that: Before the step of controlling the compressor to compress the carbon dioxide to obtain compressed carbon dioxide, the method further includes: Detecting the flow rate and temperature of the industrial waste heat wastewater, and comparing the flow rate and temperature of the industrial waste heat wastewater with a flow rate threshold and a temperature threshold, respectively, to obtain a comparison result; If the comparison result is that the flow rate of the industrial waste heat wastewater is less than the flow rate threshold or the temperature of the industrial waste heat wastewater is less than the temperature threshold, the air source heating mode is adopted; If the comparison result is that the flow rate of the industrial waste heat waste water is not less than the flow rate threshold and the temperature of the industrial waste heat waste water is not less than the temperature threshold, the waste heat source heating mode is adopted.

3. The heating control method of the multi-stage heating system according to claim 2, characterized in that: The system further includes an air source heating pipeline, the air source heating pipeline includes an air source evaporator, the cold fluid outlet of the vortex tube is connected to the inlet of the air source evaporator, and a first solenoid valve is provided between the cold fluid outlet of the vortex tube and the inlet of the air source evaporator; The step of flowing the heated carbon dioxide through the vortex tube to the desuperheater and supplying water to the second preset temperature for heat exchange to obtain hot water that meets the heating requirements of the sewage treatment section includes: The heated carbon dioxide flows into the inlet of the vortex tube and is divided into carbon dioxide at the cold fluid outlet of the vortex tube and carbon dioxide at the hot fluid outlet of the vortex tube after throttling inside the vortex tube; If the current heating mode is the air source heating mode, the first solenoid valve is opened to allow the carbon dioxide at the cold fluid outlet of the vortex tube to flow to the air source evaporator, where it absorbs the heat of the industrial waste heat wastewater and then flows into the regenerator; The carbon dioxide at the hot fluid outlet of the vortex tube flows to the desuperheater and is supplied to the second preset temperature water for heat exchange, thereby obtaining hot water that meets the heating requirements of the sewage treatment section.

4. The heating control method of the multi-stage heating system according to claim 2, characterized in that: The system further includes a waste heat source heat supply pipeline, the waste heat source heat supply pipeline includes a waste heat source evaporator, the cold fluid outlet of the vortex tube is connected to the inlet of the waste heat source evaporator, and a second solenoid valve is provided between the cold fluid outlet of the vortex tube and the inlet of the waste heat source evaporator; The step of flowing the heated carbon dioxide through the vortex tube to the desuperheater and supplying water to the second preset temperature for heat exchange to obtain hot water that meets the heating requirements of the sewage treatment section includes: The heated carbon dioxide flows into the inlet of the vortex tube and is divided into carbon dioxide at the cold fluid outlet of the vortex tube and carbon dioxide at the hot fluid outlet of the vortex tube after throttling inside the vortex tube; If the current heating mode is the waste heat source heating mode, the second solenoid valve is opened to allow the carbon dioxide at the cold fluid outlet of the vortex tube to flow to the waste heat source evaporator, absorb the heat from the industrial waste heat wastewater, and then flow into the regenerator; The carbon dioxide at the hot fluid outlet of the vortex tube flows to the desuperheater and is supplied to the second preset temperature water for heat exchange, thereby obtaining hot water that meets the heating requirements of the sewage treatment section.

5. The heating control method of the multi-stage heating system according to claim 3, characterized in that: The air source heating pipeline further includes a first throttle valve, which is located between the cold fluid outlet of the vortex tube and the inlet of the air source evaporator; If the current heating mode is the air source heating mode, the step of opening the first solenoid valve to allow the carbon dioxide at the cold fluid outlet of the vortex tube to flow to the air source evaporator, absorb the heat of the industrial waste heat wastewater, and then flow into the regenerator includes: If the current heating mode is the air source heating mode, the first solenoid valve is opened, and the opening of the first throttle valve is adjusted according to the difference between the outlet temperature of the air source evaporator and the preset outlet temperature; Based on the opening degree of the first throttle valve, the carbon dioxide at the cold fluid outlet of the vortex tube flows to the air source evaporator, absorbs the heat of the industrial waste heat wastewater, and then flows into the regenerator.

6. The heating control method of the multi-stage heating system according to claim 4, characterized in that: The waste heat source heat supply pipeline further includes a second throttle valve, which is located between the cold fluid outlet of the vortex tube and the inlet of the waste heat source evaporator; If the current heating mode is the waste heat source heating mode, the step of opening the second solenoid valve to allow the carbon dioxide at the cold fluid outlet of the vortex tube to flow to the waste heat source evaporator, absorb the heat of the industrial waste heat wastewater, and then flow into the regenerator includes: If the current heating mode is the waste heat source heating mode, the second solenoid valve is opened, and the opening of the second throttle valve is adjusted according to the difference between the outlet pressure of the waste heat source evaporator and the preset outlet pressure; Based on the opening degree of the second throttle valve, the carbon dioxide at the cold fluid outlet of the vortex tube flows to the waste heat source evaporator, absorbs the heat of the industrial waste heat wastewater, and then flows into the regenerator.

7. The heating control method of the multi-stage heating system according to claim 1, characterized in that: The desuperheating and cooling pipeline further includes a first adjustable valve, which is located between the hot fluid outlet of the vortex tube and the inlet of the desuperheating and cooling device; The method further comprises: adjusting the opening of the first adjustable valve according to the difference between the temperature of the hot fluid outlet of the vortex tube and a preset temperature of the hot fluid outlet; The ratio of the carbon dioxide at the cold fluid outlet of the vortex tube to the carbon dioxide at the hot fluid outlet of the vortex tube is adjusted based on the opening degree of the first adjustable valve.

8. A heating control device for a multi-stage heating system, characterized in that: The device is applied to a multi-stage heat tracing system, the system comprising a cooling circulation pipeline and a desuperheating and cooling pipeline, the cooling circulation pipeline comprising a compressor, a high-temperature cooler, a medium-temperature cooler and a regenerator, the desuperheating and cooling pipeline comprising a vortex tube and a desuperheating and cooling pipeline, the hot fluid outlet of the vortex tube being connected to the inlet of the desuperheating and cooling pipeline, the regenerator being connected to the vortex tube, and the device comprising: a compression control module, configured to control the compressor to compress the carbon dioxide to obtain compressed carbon dioxide; a high-temperature cooling module for transferring the compressed carbon dioxide to the high-temperature cooler for heat exchange with water supplied at a first preset temperature, thereby obtaining hot water meeting the heating requirements of the hot wash section of the oil well and the exothermic carbon dioxide; A medium-temperature cooling module is used to transfer the exothermic carbon dioxide to the medium-temperature cooler and the second preset temperature water supply for heat exchange, thereby obtaining hot water that meets the heating requirements of the crude oil transportation section and the carbon dioxide after secondary exothermicity; The desuperheating and cooling module is used to heat the carbon dioxide after the secondary heat release through the regenerator, and the heated carbon dioxide flows to the desuperheating and cooling device through the vortex tube, and exchanges heat with the second preset temperature water supply to obtain hot water that meets the heating requirements of the sewage treatment section.

9. A heating control device for a multi-stage heating system, characterized in that: The device includes: a memory, a processor, and a heating control program for a multi-stage heating system stored in the memory and executable on the processor. The heating control program for the multi-stage heating system is configured to implement the steps of the heating control method for a multi-stage heating system according to any one of claims 1 to 7.

10. A storage medium, characterized in that: The storage medium stores a heating control program for a multi-stage heating system, which, when executed by a processor, implements the steps of the heating control method for a multi-stage heating system according to any one of claims 1 to 7.

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