Control method of steam energy-saving heating system

Abstract

The invention provides a control method of a steam energy-saving heating system, which comprises a first heating mode and a second heating mode, and the first heating mode comprises the following steps: A4, controlling steam to enter a steam heat exchanger through a steam main pipe, and controlling a variable frequency pump on a communicating pipeline to be in a closed state; a5, controlling the to-be-heated material in the heating pipeline to exchange heat with the steam heat exchanger; and A6, condensate water generated by the steam heat exchanger is controlled to enter the water tank through the communicating pipeline and is accumulated. According to the steam energy-saving heating system, condensate water of the steam heat exchanger is recycled, different heating modes are switched by detecting different temperatures and liquid levels, the overall adaptability and the energy utilization rate of the system are improved, steam consumption is reduced, the heating time is shortened, and the heating efficiency of the steam energy-saving heating system is improved.

Description

[0001] This application is a divisional application of Chinese application filed on December 20, 2022, with application number 202211643368.0 and invention title "A Control Method for a Steam Energy-Saving Heating System". Technical Field

[0002] This invention relates to the field of energy conservation and utilization technology, and in particular to a control method for a steam energy-saving heating system. Background Technology

[0003] With the increasing severity of energy issues and people's growing emphasis on the living environment, clean energy and the full utilization of energy are particularly important. Steam, as a clean and renewable resource, is widely used. For example, in dehumidification systems, steam is often used as a heating source for heating and desorption in the regeneration zone of the dehumidification rotor.

[0004] However, existing steam heating devices have low utilization rates. A large amount of heat energy is directly discharged after each heat exchange, resulting in waste and increased energy costs. The direct discharge of condensate generated by steam heating is not only a waste of energy but also increases environmental pollution. There is currently no effective control method to recycle the residual heat energy of steam. Therefore, there is an urgent need for an effective and simple control method to solve these problems. Summary of the Invention

[0005] This invention addresses the problems in existing technologies, such as low steam utilization rate leading to energy waste, direct discharge of steam condensate causing energy waste, environmental unfriendliness, and slow steam heating efficiency.

[0006] This invention provides a control method for a steam energy-saving heating system. The system includes a hot water heat exchanger, a steam heat exchanger, a steam header, a connecting pipe, an outlet pipe, a return pipe, and a heating pipe. The steam header is used to input steam into the steam heat exchanger. Condensate generated by the steam heat exchanger flows into the hot water heat exchanger through the connecting pipe. Condensate from the hot water heat exchanger is discharged through the outlet pipe. The return pipe is provided between the hot water heat exchanger and the steam heat exchanger. The heating pipe is sequentially connected to the hot water heat exchanger and the steam heat exchanger. The control method includes a first heating mode, which includes:

[0007] A4: Control the steam to enter the steam heat exchanger through the steam header, and control the variable frequency pump on the connecting pipeline to be in the off state;

[0008] A5: Controls the heat exchange between the material to be heated in the heating pipeline and the steam heat exchanger;

[0009] A6: Control the condensate generated by the steam heat exchanger to enter the water tank through the connecting pipe and accumulate there.

[0010] Preferably, the first heating mode further includes:

[0011] S3: Control the liquid level sensor in the water tank to detect whether the condensate water has reached the preset liquid level;

[0012] S4: When the liquid level sensor in the water tank detects that the condensate has reached the preset liquid level, the variable frequency pump is controlled to start, filling the hot water heat exchanger with condensate in the water tank, and then the second heating mode is entered.

[0013] Preferably, a second heating mode is included after the first heating mode, the second heating mode comprising:

[0014] B1: The material to be heated in the heating pipeline first exchanges heat with the hot water heat exchanger, and the temperature of the material to be heated is heated to W1;

[0015] B2: Control the material to be heated in the heating pipeline to exchange heat with the steam heat exchanger, and the temperature of the material to be heated is heated to W2, W2>W1.

[0016] Preferably, the second heating mode further includes:

[0017] B5: Control the second thermometer on the connecting pipe to detect the temperature W3, and control the third thermometer to detect the inlet temperature W4 of the heating pipe;

[0018] B6: When W3>W4, the electric regulating valve in the return water pipeline is opened, and the electric shut-off valve in the outlet water pipeline is closed.

[0019] B7: Controls the condensate flowing out of the hot water heat exchanger to flow back into the water tank through the return water pipe and enter the circulation;

[0020] B8: Control the loop until W3 = W4;

[0021] B9: When W3 = W4, the electric regulating valve in the return water pipeline is closed, and the electric shut-off valve in the outlet water pipeline is opened.

[0022] B10: Controls the condensate draining from the hot water heat exchanger and the condensate draining from the water tank;

[0023] B11: Re-enter the first heating mode.

[0024] Preferably, the control method further includes:

[0025] Control the fourth thermometer to detect the outlet temperature of the heating pipe;

[0026] When the temperature detected by the fourth thermometer is higher than the preset value, the proportional regulating valve at the steam header is controlled and the steam input is reduced.

[0027] When the temperature detected by the fourth thermometer is lower than the preset value, the proportional regulating valve at the steam header is controlled and the steam input is increased.

[0028] The beneficial effects of this invention are as follows: by reusing steam heat energy, the energy utilization rate is improved and waste is reduced; the use of secondary heating improves the working efficiency of the steam heating system and shortens the heating time; the control method used in this invention has a wide range of applications, taking into account different amounts of condensate produced by the steam heat exchanger; and the most suitable working mode is selected according to different detected temperatures and liquid levels, thereby improving the overall adaptability and energy utilization rate of the system. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of a steam energy-saving heating system according to the first embodiment of the present invention;

[0030] Figure 2 The steps of the first heating mode in the first embodiment of the present invention;

[0031] Figure 3 The steps for ensuring stable operation of the hot water heat exchanger according to the first embodiment of the present invention;

[0032] Figure 4 This is the step of detecting the second thermometer on the connecting pipe in the first embodiment of the present invention;

[0033] Figure 5 This is the step of detecting the first thermometer on the water outlet pipe in the first embodiment of the present invention;

[0034] Figure 6 This is a schematic diagram of a steam energy-saving heating system according to a second embodiment of the present invention;

[0035] Figure 7 The steps of the first heating mode in the second embodiment of the present invention;

[0036] Figure 8 This is a step for ensuring stable operation of the hot water heat exchanger according to the second embodiment of the present invention;

[0037] Figure 9 The steps for detecting the second thermometer on the connecting pipe and the third thermometer on the heating pipe are described in the second embodiment of the present invention.

[0038] In the picture,

[0039] 1. Steam energy-saving heating system; 2. First heating section; 3. Second heating section; 4. Connecting pipeline; 5. Heating pipeline; 6. Steam header; 7. Water outlet pipeline; 8. Liquid level sensor; 9. Electric shut-off valve; 10. Safety valve; 11. Return water pipeline; 12. Second thermometer; 13. Variable frequency pump; 14. First thermometer; 15. Electric regulating valve; 16. Water tank; 17. Third thermometer; 18. Proportional regulating valve; 19. Fourth thermometer. Detailed Implementation

[0040] The present invention will now be described in detail with reference to the accompanying drawings. The description in this section is merely illustrative and explanatory and should not be construed as limiting the scope of protection of the present invention.

[0041] Figure 1 This is a schematic diagram of a steam energy-saving heating system 1 according to a first embodiment of the present invention. In this embodiment, the steam energy-saving heating system 1 includes a first heating part 2, a second heating part 3 connected to the first heating part 2 through a connecting pipe 4, a heating pipe 5, and a return water pipe 11.

[0042] The first heating unit 2 is a hot water heat exchanger, and the second heating unit 3 is a steam heat exchanger. The input end of the steam heat exchanger is connected to a steam header 6, and steam enters the steam heat exchanger through the steam header 6. The condensate generated by the steam heat exchanger flows into the hot water heat exchanger through the connecting pipe 4. The output end of the hot water heat exchanger is connected to an outlet pipe 7, which is used to discharge the condensate inside the hot water heat exchanger. The outlet pipe 7 includes a liquid level sensor 8, an electric shut-off valve 9, a safety valve 10, and a first thermometer 14.

[0043] The heating pipe 5 is connected to the first heating section 2 and the second heating section 3 in sequence. The material to be heated first flows into the first heating section 2, then flows out of the first heating section 2 and into the second heating section 3. When it flows out of the second heating section 3, the material to be heated has been heated to the preset temperature. A fourth thermometer 19 is installed at the outlet end of the heating pipe 5, and a proportional regulating valve 18 is installed on the steam header 6. When the fourth thermometer 19 detects temperature fluctuations, the control device controls the proportional regulating valve 18 to adjust the steam input.

[0044] The condensate discharged from the hot water heat exchanger is reintroduced into the connecting pipe 4 through the return water pipe 11, allowing the condensate to be recycled. A second thermometer 12 is installed on the connecting pipe 4, with the required temperature value preset. A variable frequency pump 13 is installed on the return water pipe 11, and the operating frequency of the variable frequency pump 13 is controlled by the temperature change to adjust the condensate flow rate in the return water pipe 11.

[0045] In some embodiments, the control method of the steam energy-saving heating system 1 of the present invention includes the following steps, such as... Figure 2 :

[0046] In the first procedure, the material to be heated is heated through heating pipe 5 in a first heating mode, which includes:

[0047] A1: Control the steam to enter the steam heat exchanger through the steam header 6, and control the electric shut-off valve 9 in the outlet water pipe 7 to be in the closed state.

[0048] A2: Controls the heat exchange between the material to be heated in heating pipeline 5 and the steam heat exchanger;

[0049] A3: The condensate generated by the steam heat exchanger enters the hot water heat exchanger through the connecting pipe 4 and accumulates there.

[0050] When the system is first started, it operates in the first heating mode, where only the steam heat exchanger and the material to be heated exchange heat. There is no condensate in the hot water heat exchanger, and it has not reached the working state. In order to accumulate condensate, the electric shut-off valve 9 in the outlet pipe 7 is in the closed state.

[0051] The second procedure, ensuring stable operation of the hot water heat exchanger, involves the following control methods for the steam energy-saving heating system 1: Figure 3 :

[0052] S1: When condensate accumulates in the hot water heat exchanger, the level sensor 8 in the outlet pipe 7 is controlled to detect whether there is condensate.

[0053] S2: When the liquid level sensor 8 detects condensate, it controls the electric shut-off valve 9 on the water outlet pipe 7 to open, and then enters the second heating mode.

[0054] As the first heating mode begins, initially, the hot water heat exchanger lacks sufficient condensate, and the electric shut-off valve 9 is closed. As the steam heat exchanger continuously supplies condensate to the hot water heat exchanger, the condensate accumulates until it reaches saturation and flows into the outlet pipe 7. The outlet pipe 7 contains a level sensor 8 and an electric shut-off valve 9. The level sensor 8 detects the liquid level in the outlet pipe 7, and the electric shut-off valve 9 controls the opening and closing of the outlet pipe 7. When the level sensor 8 detects that the liquid level in the outlet pipe 7 reaches a preset value, it outputs a feedback signal through the control device and controls the electric shut-off valve 9 to open, thus discharging the condensate from the hot water heat exchanger. At this point, the hot water heat exchanger operates stably and enters the second heating mode. During this process, the pressure in each pipe of the steam energy-saving heating system 1 constantly changes. To ensure the safety of the device, a safety valve 10 can be configured to release pressure and maintain device safety when the pressure becomes too high (above 0.6 MPa) throughout the process.

[0055] The third procedure involves heating the material to be heated via heating pipe 5 using a second heating mode, which includes the following steps:

[0056] B1: The material to be heated in the heating pipe 5 first exchanges heat with the hot water heat exchanger, and the temperature is heated to W1;

[0057] B2: Control the material to be heated in heating pipe 5 to exchange heat with the steam heat exchanger, and the temperature is heated to W2, W2>W1.

[0058] The second heating mode also includes the step of detecting the temperature using the second thermometer 12 on the connecting pipe 4, such as... Figure 4 :

[0059] B3: Control the second thermometer 12 on the connecting pipe 4 to detect the temperature. When the temperature detected by the second thermometer 12 is higher than the preset value, control the variable frequency pump 13 on the return water pipe 11 to increase the flow rate of condensate in the return water pipe 11 into the connecting pipe 4, and / or control to reduce the amount of steam input to the steam header 6.

[0060] The condensate has the highest temperature when it flows out of the steam heat exchanger. After circulating through the pipeline, the temperature decreases. Therefore, the temperature of the condensate in the return water pipeline 11 is lower than that in the connecting pipeline 4. When the second thermometer 12 detects that the temperature in the connecting pipeline 4 is higher than the preset value, it sends a signal to the variable frequency pump 13. The lower-temperature condensate discharged from the hot water heater flows back into the connecting pipeline 4 through the return water pipeline 11 to lower the temperature in the connecting pipeline 4. The condensate can flow from the connecting pipeline 4 through the hot water heat exchanger and then back to the connecting pipeline 4 from the return water pipeline 11. This is called a local small circulation. The beneficial effect of this is to ensure the stability of the condensate temperature input to the hot water heater, thereby improving the stability and controllability of the heating temperature of the hot water heater. This, in turn, adjusts the amount of steam input to the steam header 6, reduces the amount of steam used, and reduces energy consumption. The stability of the local small circulation also improves the stability of the overall circulation and reduces the damage of condensate to the equipment.

[0061] The second heating mode also includes the step of detecting the temperature using the first thermometer 14 on the water outlet pipe 7, such as... Figure 5 :

[0062] B4: Control the temperature detected by the first thermometer 14 on the water outlet pipe 7. When the temperature detected by the first thermometer 14 is higher than the preset value, reduce the preset value of the second thermometer 12 and / or reduce the amount of steam input to the steam header 6.

[0063] A first thermometer 14 is installed in the outlet pipe 7 to detect the temperature of the discharged condensate. When the discharge temperature is higher than the preset value, the preset temperature of the second thermometer 12 is adjusted accordingly to adjust the local small circulation, thereby reducing the amount of steam input to the steam header 6, reducing steam consumption, and reducing energy consumption. This makes the temperature discharged from the outlet pipe 7 approach the temperature at the input end of the heating pipe 5. When the input temperature of the heating pipe 5 is the ambient temperature, and the temperature discharged from the steam energy-saving heating system 1 approaches the ambient temperature, the beneficial effect is to minimize the damage to the environment and minimize the waste of energy.

[0064] Figure 6 This is a schematic diagram of the steam energy-saving heating system 1 according to the second embodiment of the present invention. This embodiment is a further optimization based on the first embodiment. The same parts will not be described again. In this embodiment, the connecting pipe 4 is equipped with a water tank 16, a frequency converter pump 13, and a second thermometer 12. The heating pipe 5 is equipped with a third thermometer 17. The return water pipe 11 is equipped with an electric regulating valve 15. One end of the return water pipe 11 is connected to the outlet water pipe 7, and the other end is connected to the water tank 16.

[0065] In some embodiments, the control method of the steam energy-saving heating system 1 of the present invention includes the following steps, such as... Figure 7 :

[0066] In the first procedure, the material to be heated is heated through heating pipe 5 in a first heating mode, which includes:

[0067] A4: Control the steam to enter the steam heat exchanger through the steam header 6, and control the variable frequency pump 13 on the connecting pipe 4 to be in the off state;

[0068] A5: Controls the heat exchange between the material to be heated in heating pipe 5 and the steam heat exchanger;

[0069] A6: Control the condensate generated by the steam heat exchanger to enter the water tank 16 through the connecting pipe 4 and accumulate there.

[0070] When the system is first started, it operates in the first heating mode, where only the steam heat exchanger and the material to be heated exchange heat. The condensate flowing out of the steam heat exchanger first flows into the water tank 16. In order to accumulate condensate, the variable frequency pump 13 in the connecting pipe 4 is in the off state.

[0071] The second procedure, ensuring stable operation of the hot water heat exchanger, includes the following steps: Figure 8 :

[0072] S3: Control the level sensor 8 in the water tank 16 to detect whether the condensate has reached the preset level;

[0073] S4: When the liquid level sensor 8 in the water tank 16 detects that the condensate has reached the preset liquid level, the variable frequency pump 13 is controlled to start, filling the hot water heat exchanger with condensate in the water tank 16, and then entering the second heating mode.

[0074] As the first heating mode continues to run, the condensate in the water tank 16 accumulates until it becomes saturated. When the liquid level sensor 8 in the water tank 16 detects that the condensate in the water tank 16 has reached the preset liquid level, it sends a signal back to the control device. The control device then controls the variable frequency pump 13 to start, and the variable frequency pump 13 pumps the condensate in the water tank 16 into the hot water heat exchanger. After the hot water heat exchanger is filled with condensate, it begins to work stably.

[0075] The third procedure involves heating the material to be heated via heating pipe 5 using a second heating mode, which includes the following steps:

[0076] B1: The material to be heated in the heating pipe 5 first exchanges heat with the hot water heat exchanger, and the temperature is heated to W1;

[0077] B2: Control the material to be heated in heating pipe 5 to exchange heat with the steam heat exchanger, and the temperature is heated to W2, W2>W1.

[0078] The second heating mode also includes the steps of the second thermometer 12 detecting the temperature W3 on the connecting pipe 4, and the third thermometer 17 detecting the inlet temperature W4 of the heating pipe 5, as follows: Figure 9 :

[0079] B5: Control the second thermometer 12 on the connecting pipe 4 to detect the temperature W3, and control the third thermometer 17 to detect the inlet temperature W4 of the heating pipe 5;

[0080] B6: When W3>W4, the electric regulating valve 15 in the return water pipeline 11 is opened, and the electric shut-off valve 9 in the outlet water pipeline 7 is closed.

[0081] B7: Controls the condensate flowing out of the hot water heat exchanger to flow back into the water tank 16 through the return water pipe 11 and enter the circulation;

[0082] B8: Control the loop until W3 = W4;

[0083] B9: When W3 = W4, the electric regulating valve 15 in the return water pipeline 11 is closed, and the electric shut-off valve 9 in the outlet water pipeline 7 is opened.

[0084] B10: Controls the condensate draining from the hot water heat exchanger and the condensate draining from the water tank 16;

[0085] B11: Re-enter the first heating mode.

[0086] When entering the second heating mode, the hot water heat exchanger is just filled with condensate from the water tank 16. At this time, the temperature inside the hot water heat exchanger is at its highest. The temperature W3 detected by the second thermometer 12 is higher than the temperature W4 detected by the third thermometer 17, i.e., W3>W4. The hot water heat exchanger can be used to exchange heat with the material to be heated in the heating pipe 5. In order to make full use of the heat energy in the hot water heat exchanger, the condensate is recycled. The electric regulating valve 15 in the return water pipe 11 is opened, and the electric shut-off valve 9 in the outlet water pipe 7 is closed. The condensate flowing out of the hot water heat exchanger flows back into the water tank 16 through the return water pipe 11 and enters the circulation. As the circulation progresses... As the temperature of the condensate in the hot water heat exchanger continuously decreases, it flows into the water tank 16, causing the temperature of the condensate in the water tank 16 to also continuously decrease. This cycle continues until the temperature detected by the second thermometer 12 equals the temperature detected by the third thermometer 17, i.e., W3 = W4. At this point, the hot water heat exchanger can no longer provide heating. The electric regulating valve 15 in the return water pipe 11 closes, and the electric shut-off valve 9 in the outlet water pipe 7 opens, draining the condensate from the hot water heat exchanger and the water tank 16. The system then re-enters the first heating mode, and the water tank 16 begins to accumulate condensate again. The steam energy-saving heating system 1 begins a new cycle.

[0087] The beneficial effect of the control method in this embodiment is that it no longer provides preset values ​​for the second thermometer 12 and the third thermometer 17, but instead compares their detected values. The second thermometer 12 detects the temperature of the condensate entering the hot water heat exchanger, and the third thermometer 17 detects the temperature of the material to be heated. As long as the temperature W3 detected by the second thermometer 12 is higher than the temperature W4 detected by the third thermometer 17 (i.e., W3>W4), the hot water heat exchanger can provide a certain heating function. Therefore, the electric regulating valve 15 in the return water pipe 11 is opened, and the electric shut-off valve 9 in the outlet water pipe 7 is closed, continuously recycling the condensate until the temperature W3 detected by the second thermometer 12 equals that of the third thermometer 17. When the detected temperature W4, i.e., W3 = W4, the hot water heat exchanger can no longer provide heating. The electric regulating valve 15 in the return water pipe 11 is closed, and the electric shut-off valve 9 in the outlet water pipe 7 is opened. The condensate in the hot water heat exchanger is drained, and the condensate in the water tank 16 is drained. This maximizes the thermal energy utilization rate of the condensate, thereby reducing the amount of steam input to the steam header 6, reducing steam consumption, and reducing energy consumption. If the input temperature of the heating pipe 5 is the ambient temperature, and the temperature discharged by the steam energy-saving heating system 1 is close to the ambient temperature, the damage to the environment is minimized. The control method in this embodiment is particularly suitable for situations where the steam heat exchanger in the system produces little condensate.

[0088] In any embodiment, the control method for the steam energy-saving heating system 1 also includes the step of detecting the outlet temperature of the heating pipe 5 using a fourth thermometer 19.

[0089] When the fourth thermometer 19 detects a temperature higher than the preset value, it controls the proportional regulating valve 18 at the steam header 6 and reduces the steam input.

[0090] When the temperature detected by the fourth thermometer is lower than the preset value, the proportional regulating valve 18 at the steam header 6 is controlled and the steam input is increased.

[0091] To ensure the stability of the output temperature of heating pipe 5, a fourth thermometer is installed at the output end of heating pipe 5. Based on the temperature change detected by the fourth thermometer, the proportional regulating valve 18 continuously adjusts the amount of steam input from the steam header 6 to the steam heat exchanger. The beneficial effects are that it not only ensures the stability of the output temperature, but also saves steam consumption, reduces energy consumption, and saves costs.

[0092] In this invention, the first heating mode and the second heating mode can be switched between each other. Depending on actual needs, it can be determined whether the condensate in the hot water heat exchanger and the condensate in the water tank 16 needs to be drained during mode switching. The condensate draining step in Embodiment 2 is also applicable to Embodiment 1. Alternatively, the condensate draining step can be determined by comparing the temperature detected by the second thermometer 12 with the temperature detected by the first thermometer 14 in Embodiment 1.

[0093] This invention has a wide range of applications. Taking the actual application in the lithium battery industry as an example, with the rapid development of the new energy and lithium battery market, a very dry air environment is required in the production process of lithium batteries, which requires the use of a rotary dehumidification system. In the existing technology, the rotary regeneration heating energy method currently tends to be steam heating, and the amount of steam used is huge, which leads to an increase in cost. The control method of the steam energy-saving heating system 1 of this invention greatly increases the steam utilization rate and effectively reduces costs.

[0094] It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0095] The embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A control method for a steam energy-saving heating system, characterized in that: The system includes a hot water heat exchanger, a steam heat exchanger, a steam header, connecting pipes, an outlet pipe, a return pipe, and heating pipes. The steam header supplies steam to the steam heat exchanger. Condensate from the steam heat exchanger flows into the hot water heat exchanger through the connecting pipes, and condensate from the hot water heat exchanger is discharged through the outlet pipe. The return pipe connects the hot water heat exchanger and the steam heat exchanger. The heating pipes connect the hot water heat exchanger and the steam heat exchanger in sequence. The control method includes a first heating mode, which includes: A4: Control the steam to enter the steam heat exchanger through the steam header, and control the variable frequency pump on the connecting pipeline to be in the off state; A5: Controls the heat exchange between the material to be heated in the heating pipeline and the steam heat exchanger; A6: Control the condensate generated by the steam heat exchanger to enter the water tank through the connecting pipe and accumulate there.

2. The control method for the steam energy-saving heating system according to claim 1, characterized in that: The first heating mode further includes: S3: Control the liquid level sensor in the water tank to detect whether the condensate water has reached the preset liquid level; S4: When the liquid level sensor in the water tank detects that the condensate has reached the preset liquid level, the variable frequency pump is controlled to start, filling the hot water heat exchanger with condensate in the water tank, and then the second heating mode is entered.

3. The control method for the steam energy-saving heating system according to claim 1, characterized in that: Following the first heating mode, a second heating mode is further included, the second heating mode comprising: B1: The material to be heated in the heating pipeline first exchanges heat with the hot water heat exchanger, and the temperature of the material to be heated is heated to W1; B2: Control the material to be heated in the heating pipeline to exchange heat with the steam heat exchanger, and the temperature of the material to be heated is heated to W2, W2>W1.

4. The control method for the steam energy-saving heating system according to claim 3, characterized in that: The second heating mode also includes: B5: Control the second thermometer on the connecting pipe to detect the temperature W3, and control the third thermometer to detect the inlet temperature W4 of the heating pipe; B6: When W3>W4, the electric regulating valve in the return water pipeline is opened, and the electric shut-off valve in the outlet water pipeline is closed. B7: Controls the condensate flowing out of the hot water heat exchanger to flow back into the water tank through the return water pipe and enter the circulation; B8: Control the loop until W3 = W4; B9: When W3 = W4, the electric regulating valve in the return water pipeline is closed, and the electric shut-off valve in the outlet water pipeline is opened. B10: Controls the condensate draining from the hot water heat exchanger and the condensate draining from the water tank; B11: Re-enter the first heating mode.

5. The control method for the steam energy-saving heating system according to any one of claims 1-4, characterized in that: The control method further includes: Control the fourth thermometer to detect the outlet temperature of the heating pipe; When the temperature detected by the fourth thermometer is higher than the preset value, the proportional regulating valve at the steam header is controlled and the steam input is reduced. When the temperature detected by the fourth thermometer is lower than the preset value, the proportional regulating valve at the steam header is controlled and the steam input is increased.

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