Multi-phase flow heating control system and method suitable for gas and liquid heat sources

Abstract

The invention discloses a multiphase flow heating control system and method suitable for gas and liquid heat sources, and the method comprises the steps: measuring the mass flow of a gas-phase heat source and the mass flow of a liquid-phase heat source, and calculating the average mass flow of a mixed fluid; measuring the volume flow # imgabs 0 # of the gas-phase heat source and the volume flow # imgabs 1 # of the liquid-phase heat source, and calculating the volume fractions of the gas-phase heat source and the liquid-phase heat source in the mixture in the mixed heater; measuring the volume flow viscosity of the gas-phase heat source and the volume flow viscosity of the liquid-phase heat source, and calculating the effective viscosity; calculating the multi-phase flow Reynolds number in the heater, and judging the mixing state of the gas-phase heat source and the liquid-phase heat source in the heater; if not, the real-time flow of the gas-phase heat source and the real-time flow of the liquid-phase heat source are adjusted. According to data of mass, volume flow, viscosity and temperature, distribution of a gas-phase heat source and a liquid-phase heat source in the heating device is adjusted, the problem that the heat efficiency is reduced due to the poor mixing effect is effectively avoided, and the running reliability of equipment is remarkably improved.

Description

Technical Field

[0001] This invention belongs to the field of multiphase flow heat transfer and water treatment, specifically relating to a multiphase flow heating control system and method suitable for gas and liquid heat sources. Background Technology

[0002] During the production process, generator factories often generate gaseous and liquid heat sources of different temperatures and volumes in shaft seal overflow, low-temperature economizers, and heating condensates. These heat sources have relatively poor thermal energy quality, unstable flow rates, and low utilization efficiency, and are usually directly discharged, which not only wastes energy but also increases thermal pollution to the environment.

[0003] Due to the unique properties of gaseous and liquid two-phase waste heat resources in power plants, existing heating control systems face significant limitations and challenges in energy conversion and efficient utilization. Gas-phase and liquid-phase heat sources differ significantly in temperature, pressure, and flow characteristics, introducing complexity and uncertainty into system design and operation.

[0004] In systems attempting to utilize both gaseous and liquid heat sources simultaneously, the effective mixing of the two fluid phases becomes crucial. The mixing effect not only directly impacts heat exchange efficiency but can also trigger a series of flow and heat transfer challenges. For example, uneven mixing can lead to excessively high or low local heat loads, thus affecting the overall system's thermal efficiency and stability. Furthermore, flow instability phenomena such as vortices and turbulence may occur during the mixing process, increasing system energy consumption and wear.

[0005] More seriously, improper mixing strategies can lead to problems such as phase separation or gas-liquid blockage. Phase separation reduces the utilization rate of the heat source, while gas-liquid blockage can directly threaten the safe operation of the system and even damage equipment. Especially in extreme environments with high temperature and pressure, improper mixing of gas and liquid phases can trigger more serious safety accidents, such as leaks and explosions, all of which pose a significant threat to personnel safety, environmental protection, and the continuous operation of the power plant.

[0006] Therefore, designing and implementing an efficient, stable, and safe gas-liquid two-phase mixing strategy has become a critical issue that urgently needs to be addressed in the field of waste heat resource utilization in power plants. This requires not only in-depth research into the flow and heat transfer mechanisms of the gas-liquid two phases, but also the development of advanced control algorithms and monitoring technologies to ensure that the system maintains optimal mixing performance and operational stability under various operating conditions. At the same time, strengthening safety protection measures and improving the system's fault tolerance and emergency response capabilities are also indispensable for ensuring the efficient and safe utilization of waste heat resources. Summary of the Invention

[0007] To address the technical problems of poor quality and unstable temperature and flow rate of gaseous and liquid phase fluid heat sources in existing technologies, leading to poor mixing effects, this invention provides a multiphase flow heating control system and method suitable for gaseous and liquid heat sources. The aim is to improve the utilization efficiency of gaseous and liquid two-phase heat sources while ensuring operational safety. This method achieves precise mixing and temperature control of the gaseous and liquid two-phase fluids, effectively avoiding phase separation and blockage problems, preventing potential risks under high-temperature and high-pressure environments, and ensuring the dual goals of efficient energy utilization and environmental protection.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A multiphase flow heating control method applicable to gas and liquid heat sources includes the following steps: Measure the mass flow rate of the gas phase heat source and the mass flow rate of the liquid phase heat source, and calculate the average mass flow rate of the mixed fluid; Measuring the volumetric flow rate of a gas phase heat source Volumetric flow rate of liquid phase heat source Calculate the volume fractions of gaseous and liquid heat sources in the mixture within the mixing heater; Measure the volumetric flow rate viscosity of the gas phase heat source and the volumetric flow rate viscosity of the liquid phase heat source, and calculate the effective viscosity; Based on effective viscosity Calculate the Reynolds number of the multiphase flow inside the heater and determine the mixing state of the gas phase heat source and liquid phase heat source inside the heater; if it is not a laminar flow state, adjust the real-time flow rates of the gas phase heat source and liquid phase heat source.

[0009] A further improvement of the present invention lies in the average mass flow rate of the mixed fluid. Calculated using the following formula: (1-2) In the formula: —Gas phase mass flow rate, kg / s; —Gas phase mass flow rate, kg / s.

[0010] A further improvement of the present invention lies in the volume fraction of the liquid phase in the mixture. Calculated using the following formula: (1-4) In the formula: —This is the liquid volumetric flow rate, m³ / s; —This is the gas phase volumetric flow rate, m³ / s; volume fraction of gas phase in the mixture Calculated using the following formula: (1-5).

[0011] A further improvement of this invention lies in the effective viscosity. Calculated using the following formula: (1-3) In the formula: —This represents the volume fraction of the liquid phase in the mixture, % —This represents the volume fraction of the gas phase in the mixture, % —This is the dynamic viscosity of the liquid phase, Pa·s; — This is the dynamic viscosity of the gas phase, Pa·s.

[0012] A further improvement of the present invention is that if the Reynolds number Re≥2000, the real-time flow rates of the gas phase heat source and the liquid phase heat source are adjusted so that the gas phase heat source and the liquid phase heat source are in a laminar flow state. If Re<2000, the gas phase heat source and the liquid phase heat source are in a laminar flow state.

[0013] A further improvement of this invention is that the Reynolds number is calculated using the following formula: (1-1) In the formula: P—Density of the fluid, kg / m³; v — the average flow velocity inside the pipe, m / s; D—characteristic length of the pipe, in meters; μ—dynamic viscosity of the fluid, Pa·s; Re – Reynolds number.

[0014] A further improvement of the present invention is that it also includes the following steps: when the outlet water temperature of the heater is within the set range, the system maintains normal operation; when the outlet water temperature of the heater exceeds the set range, it enters an early warning state and adjusts the flow rate of steam or hot water to restore the temperature to the normal range; if adjusting the flow rate of steam or hot water does not restore the temperature to the normal range, or if the temperature exceeds the set safety limit, an alarm is triggered.

[0015] A multiphase flow heating control system suitable for gas and liquid heat sources. The multiphase flow heating system includes a hot water inlet pipe, a steam inlet pipe, and a return water pipe connected to the heater. The control system includes: A first online thermometer, a first online volumetric flow meter, a first online mass flow meter, and a first online viscometer are sequentially installed on the hot water inlet pipe; and A second online viscometer, a second online mass flow meter, and a second online volumetric flow meter are sequentially installed on the steam inlet pipeline.

[0016] A further improvement of the present invention is that a first shut-off valve, a first manual butterfly valve, a first electric regulating valve and a second manual butterfly valve are also provided on the hot water inlet pipe.

[0017] A further improvement of the present invention is that a second online thermometer, a second shut-off valve, a second electric regulating valve, a third shut-off valve and a flexible joint are also provided on the steam inlet pipe, and the steam inlet pipe is connected to the heater through the flexible joint. A manual butterfly valve is installed on the return water pipe, and a third online thermometer is installed on the heater outlet water pipe.

[0018] Compared with the prior art, the present invention has the following beneficial effects: This invention utilizes waste gas and liquid two-phase heat sources from power plant shaft seal overflow, low-temperature economizers, and heating condensates, enabling secondary utilization of previously emitted waste heat and significantly improving the energy efficiency of power plants. Simultaneously, addressing the unstable temperature and flow rates that occur during the utilization of gas and liquid phase waste heat resources, the invention acquires data on mass, volumetric flow rate, viscosity, temperature, and the Reynolds number of the multiphase flow within the heater to determine the mixing state of the gas and liquid phase heat sources. If the flow is not laminar, the real-time flow rates of the gas and liquid phase heat sources are adjusted, thereby regulating the distribution of gas and liquid phase heat sources within the heating device. This effectively avoids the problem of decreased thermal efficiency caused by poor mixing, significantly improving the reliability of equipment operation and providing a more robust safety guarantee for operators.

[0019] Furthermore, by setting up a first online thermometer, a first online volumetric flow meter, a first online mass flow meter, and a first online viscometer; and a second online viscometer, a second online mass flow meter, and a second online volumetric flow meter, parameters such as temperature, flow rate, and viscosity can be measured, and the final Reynolds number can be determined based on these parameters, making the method more direct, simple, and easy to implement. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0021] Figure 1 This is a schematic diagram of the multiphase flow heating control system of the present invention, applicable to gas and liquid heat sources; In the figure, 1 is the first online thermometer, 2 is the first online volumetric flow meter, 3 is the first online mass flow meter, 4 is the first online viscometer, 5 is the first shut-off valve, 6 is the first manual butterfly valve, 7 is the first electric regulating valve, 8 is the second manual butterfly valve, 9 is the second online volumetric flow meter, 10 is the second online mass flow meter, 11 is the second online viscometer, 12 is the second online thermometer, 13 is the second shut-off valve, 14 is the second electric regulating valve, 15 is the third shut-off valve, 16 is the flexible joint, 17 is the third manual butterfly valve, and 18 is the third online thermometer. Detailed Implementation

[0022] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0023] Furthermore, elements in this invention are referred to as being "fixed to" or "set on" another element, which may be directly on the other element or may also include an intervening element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or may also include an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0024] The present invention preferably develops a control method applicable to both gas phase heat sources and liquid phase heat sources. Through process design, by combining relevant instruments and control methods, the waste heat resources of power plants with poor temperature and flow stability can be recovered and utilized for stable heating.

[0025] See Figure 1 This invention discloses a multiphase flow heating control system applicable to gas and liquid heat sources. Based on a multiphase flow heating system, the system includes a hot water inlet pipe, a steam inlet pipe, and a return water pipe connected to a heater. The control system includes: A first online thermometer 1, a first online volumetric flow meter 2, a first online mass flow meter 3, a first online viscometer 4, a first shut-off valve 5, a first manual butterfly valve 6, a first electric regulating valve 7, and a second manual butterfly valve 8 are sequentially installed on the hot water inlet pipe. A second online viscometer 11, a second online mass flow meter 10, a second online volumetric flow meter 9, a second online thermometer 12, a second shut-off valve 13, a second electric regulating valve 14, a third shut-off valve 15, and a flexible joint 16 are sequentially installed on the steam inlet pipeline. The steam inlet pipeline is connected to the heater through the flexible joint 16.

[0026] A third manual butterfly valve 17 is installed on the return water pipeline, and a third online thermometer 18 is installed on the heater outlet water pipeline.

[0027] This invention aims to recover and fully utilize surplus heat energy of different grades in the gas and liquid phases within a generator set through a heating control system, thereby improving the energy efficiency of power plants and reducing environmental pollution. The control system employs advanced intelligent control algorithms to dynamically adjust the flow rates of the gas-liquid two-phase fluids, ensuring efficient heat transfer and utilization while maintaining optimal equipment operation.

[0028] For heaters that use both low-grade gas and liquid phase heat sources, the quality of the incoming heat source is unstable. In order to control the multiphase flow during heating and prevent uneven distribution or phase changes, the system incorporates high-precision mass and volumetric flow sensors and monitoring devices. By calculating the fluid flow state, the system maintains the multiphase flow in the heater in a laminar state, thereby reducing the risk of insufficient mixing between fluids and decreased heat exchange efficiency, and ensuring the safety of operators and the stability of equipment operation.

[0029] Specifically, the multiphase flow heating control method applicable to gas and liquid heat sources includes the following steps: The first step is to use an online mass flow meter to read the mass flow rates of the gas phase heat source and the liquid phase heat source in real time (mass flow rate of the gas phase heat source). Mass flow rate of liquid phase heat source The average mass flow rate of the mixed fluid is calculated according to formula (1-2). .

[0030] (1-2) In the formula: —Gas phase mass flow rate (kg / s); —Gas phase mass flow rate (kg / s).

[0031] The second step involves using an online volumetric flow meter to read the volumetric flow rates of the gas-phase heat source and the liquid-phase heat source in real time (the volumetric flow rate of the gas-phase heat source). Volumetric flow rate of liquid phase heat source ), calculate the volume fraction of gas phase heat source and liquid phase heat source in the mixture in the mixing heater according to formula (1-4); Volume fraction of liquid phase in the mixture Calculated using the following formula: (1-4) In the formula: —This is the liquid volumetric flow rate (m³ / s); —This is the gas phase volumetric flow rate (m³ / s).

[0032] volume fraction of gas phase in the mixture Calculated using the following formula: (1-5) The third step involves using an online viscometer to read the volumetric flow rate viscosity of the gas phase heat source and the liquid phase heat source in real time (the volumetric flow rate viscosity of the gas phase heat source). Volumetric flow rate and viscosity of liquid phase heat source ), calculate the effective viscosity according to formula (1-3) ; (1-3) In the formula: —This is the volume fraction (%) of the liquid phase in the mixture; —This is the volume fraction (%) of the gas phase in the mixture; —This is the dynamic viscosity of the liquid phase (Pa·s); — This is the dynamic viscosity of the gas phase (Pa·s).

[0033] Step 4, based on the effective viscosity Calculate the Reynolds number (Re) of the multiphase flow within the heater using formula (1-1) to determine the mixing state of the gas-phase heat source and the liquid-phase heat source within the heater. If Re ≥ 2000, adjust the real-time flow rates of the gas and liquid heat sources to ensure that the system is in a laminar flow state. If Re < 2000, the gas and liquid heat sources are in a laminar flow state.

[0034] (1-1) In the formula: P – The density of the fluid (kg / m³), which is the density of the two-phase mixture. v — the average flow velocity in the pipe (m / s), which is usually the average flow velocity of the mixed fluid; D—characteristic length of the pipe (usually taken as the pipe diameter, in meters); μ – Dynamic viscosity of the fluid (Pa·s). For mixed flows, the effective viscosity can be used.

[0035] Re – Reynolds number.

[0036] That is, the mass flow rate of the mixed fluid in the pipeline.

[0037] Fifth, after the heating system starts operating, it adjusts the supply of gaseous and liquid heat sources according to the set target temperature. When the heater outlet water temperature measured by the third online thermometer 18 is within the set range, the system maintains normal operation. When the outlet water temperature exceeds the set range, the system enters an alarm state, first adjusting the steam or hot water flow rate to attempt to restore the temperature to the normal range. If the temperature still does not return to normal after adjustment, or if the temperature exceeds the set safety limit, the system triggers an alarm. The alarm system emits audible and visual signals to warn the operator of abnormal temperature.

[0038] Simultaneously, the system automatically takes emergency measures based on abnormal situations, such as shutting off the steam supply or reducing the liquid flow rate to prevent overheating or other dangerous conditions. Once the temperature returns to the normal range, the system deactivates the alarm and resumes normal operation. The system also records all temperature alarm events for easy maintenance and fault diagnosis. Ultimately, the system achieves continuous and efficient heating, as well as alarms for abnormal temperature conditions, ensuring safe operation.

[0039] During the operation of the gas-liquid two-phase heating device, the mass flow rate of the heat source is collected by mass and volume flow meters, temperature and viscosity meters in the gas and liquid phase feed pipelines. Volumetric flow rate (volumetric flow rate of gas phase heat source) Volumetric flow rate of liquid phase heat source Temperature, viscosity (volume flow rate and viscosity of the gas phase heat source) Volumetric flow rate and viscosity of liquid phase heat source When the flow rate and temperature of the heated steam change, the system can automatically adjust the flow rate of the hot water source to ensure heating effect while preventing gas-liquid phase separation within the heater.

[0040] Example 1 A power plant uses hot water from a fixed drainage well and overflow steam from a shaft seal as a heating source. The initial hot water temperature is 90℃, the mass flow rate is 2t / h, the volume flow rate is 25m3 / h, and the viscosity is 0.0003Pa·s. The steam temperature is 120℃, the mass flow rate is 0.25t / h, the volume flow rate is 200m3 / h, and the viscosity is 0.0006Pa·s.

[0041] (1) Calculate according to formulas (1-4) and (1-5) =0.111, =0.889.

[0042] (2) Calculate the effective viscosity μ = 0.0005667 Pa·s according to formula (1-3).

[0043] (3) According to formula (1-1), Re=3975 is calculated, which is not in laminar flow state.

[0044] (4) Adjust Re to less than 2000, reserve a safety margin of 500 in the system, automatically take the value Re=1500, the system gives the initial gas and liquid phase mass distribution scheme, in which the liquid flow rate is 0.72t / h and the gas phase mass flow rate is 0.072t / h. Substitute into the formula and calculate the effective viscosity μ=0.000597Pa·s according to formula (1-3).

[0045] (5) Calculate the average mass flow rate according to formula (1-1). =0.161t / h.

[0046] If the adjusted gas phase mass flow rate accounts for 80% of the total flow rate, then =0.129t / h, =0.03t / h, which can maintain the gas and liquid phase heaters in a laminar flow state in the pipeline.

[0047] When it is necessary to increase the flow rate of a certain heat source in steam or hot water, taking steam as an example, the system is adjusted according to the following steps: If the steam mass flow rate in the heater To maintain laminar flow within the heater (Re < 2000), the system automatically adjusts the hot water mass flow rate according to formulas (1-1), (1-2), and (1-3). .

[0048] (1) Based on the set steam mass flow rate and volumetric flow rate The control system automatically calculates and adjusts the new liquid phase volumetric flow rate. And derive a new volume fraction and .

[0049] (2) Calculate the new effective viscosity .

[0050] (3) Adjust the hot water mass flow rate This makes the mass flow rate of multiphase flow... and effective viscosity The condition Re < 2000 is met; If the steam flow rate increases to 0.15 t / h, in order to ensure that the fluid in the heater is in a laminar flow state, the hot water flow rate needs to be automatically adjusted to 0.003 t / h according to the calculation results.

[0051] If the hot water mass flow rate is increased to 0.15 t / h, the steam flow rate will be automatically adjusted to 0.104 t / h according to the corresponding sequence.

[0052] This invention utilizes waste heat from power plant shaft seal overflow, low-temperature economizers, and heating condensates, repurposing previously emitted waste heat and significantly improving power plant energy efficiency. Simultaneously, addressing the instability in temperature and flow rate during waste heat utilization, the system adjusts the distribution of gas and liquid phase heat sources within the heating device by acquiring data on mass, volumetric flow rate, viscosity, and temperature. This effectively prevents thermal efficiency degradation due to poor mixing. Furthermore, based on a set target temperature, the system adjusts the supply of gas and liquid phase heat sources. When the heater outlet water temperature measured by the third online thermometer 18 is within the set range, the system operates normally. When the outlet water temperature exceeds the set range, the system enters a warning state, first adjusting the steam or hot water flow rate to attempt to restore the temperature to normal. If the temperature still does not return to normal after adjustment, or exceeds the set safety limit, the system triggers an alarm. The alarm system emits audible and visual signals to warn operators of temperature abnormalities. The integration of a real-time fault diagnosis system significantly improves equipment reliability and provides operators with stronger safety assurance.

[0053] The above description is only of the preferred embodiment of the present invention and should not be construed as limiting the scope of the claims. The present invention is not limited to the above embodiments, and variations in its specific structure are permitted. All variations made within the scope of the independent claims of the present invention are also within the scope of protection of the present invention.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

Claims

1. A multiphase flow heating control method suitable for gas and liquid heat sources, It is characterized in that The following steps are involved: Measure the mass flow rate of the gas phase heat source and the mass flow rate of the liquid phase heat source, and calculate the average mass flow rate of the mixed fluid; Measuring volume flow of gas phase heat sources Volume flow rate of liquid heat source Calculate the volume fraction of gas phase heat source and liquid phase heat source in the mixture of the mixed heater; Measure the volume flow viscosity of the gas phase heat source and the volume flow viscosity of the liquid phase heat source, and calculate the effective viscosity; According to the effective viscosity Calculate the Reynolds number of the multiphase flow in the heater and determine the mixing state of the gas phase heat source and the liquid phase heat source in the heater; if it is not a laminar flow state, adjust the real-time flow rate of the gas phase heat source and the liquid phase heat source.

2. The multiphase flow heating control method applicable to gas and liquid heat sources according to claim 1, It is characterized in that Average mass flow rate of mixed fluid Calculated by the following formula: （1-2） Where: ——Gas phase mass flow rate, kg / s; ——Gas phase mass flow rate, kg / s.

3. The multiphase flow heating control method applicable to gas and liquid heat sources according to claim 1, It is characterized in that Volume fraction of liquid in the mixture Calculated by the following formula: （1-4） Where: ——is the liquid phase volume flow rate, m³ / s; ——is the gas phase volume flow rate, m³ / s; Volume fraction of gas phase in the mixture Calculated by the following formula: （1-5）。 4. The multiphase flow heating control method applicable to gas and liquid heat sources according to claim 1, It is characterized in that Effective viscosity Calculated by the following formula: （1-3） Where: ——is the volume fraction of liquid phase in the mixture, %; ——is the volume fraction of gas phase in the mixture, %; ——is the dynamic viscosity of the liquid phase, Pa·s; ——is the dynamic viscosity of the gas phase, Pa·s.

5. The multiphase flow heating control method applicable to gas and liquid heat sources according to claim 1, It is characterized in that If the Reynolds number Re≥2000, the real-time flow rates of the gas phase heat source and the liquid phase heat source are adjusted to make the gas phase heat source and the liquid phase heat source in a laminar state. If Re<2000, the gas phase heat source and the liquid phase heat source are in a laminar state.

6. The multiphase flow heating control method applicable to gas and liquid heat sources according to claim 1 or 5, It is characterized in that The Reynolds number is calculated by the following formula: （1-1） Where: Ρ——density of fluid, kg / m³; v——average flow velocity in the pipe, m / s; D——characteristic length of the pipeline, m; μ——dynamic viscosity of the fluid, Pa·s; Re——Reynolds number.

7. The multiphase flow heating control method applicable to gas and liquid heat sources according to claim 1, It is characterized in that The following steps are also included: When the outlet water temperature of the heater is within the set range, the system maintains normal operation. When the outlet water temperature of the heater exceeds the set range, it enters the early warning state and adjusts the flow of steam or hot water to restore the temperature to the normal range. If the temperature does not return to the normal range after adjusting the flow of steam or hot water, or the temperature exceeds the set safety limit, an alarm is triggered.

8. A multiphase flow heating control system suitable for gas and liquid heat sources used in the method according to any one of claims 1 to 7, It is characterized in that The multiphase flow heating system includes a hot water inlet pipeline, a steam inlet pipeline and a return pipeline connected to the heater, and the control system includes: A first online thermometer (1), a first online volume flowmeter (2), a first online mass flowmeter (3) and a first online viscometer (4) are sequentially arranged on the hot water inlet pipeline; and A second online viscometer (11), a second online mass flowmeter (10) and a second online volume flowmeter (9) are sequentially arranged on the steam intake pipeline.

9. The multiphase flow heating control system applicable to gas and liquid heat sources as claimed in claim 8, It is characterized in that The hot water inlet pipeline is also provided with a first stop valve (5), a first manual butterfly valve (6), a first electric regulating valve (7) and a second manual butterfly valve (8).

10. The multiphase flow heating control system applicable to gas and liquid heat sources as claimed in claim 8, It is characterized in that A second online thermometer (12), a second stop valve (13), a second electric regulating valve (14), a third stop valve (15) and a flexible joint (16) are also provided on the steam intake pipeline, and the steam intake pipeline is connected to the heater via the flexible joint (16); A third manual butterfly valve (17) is provided on the return water pipeline, and a third online thermometer (18) is provided on the heater outlet water pipeline.

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