A waste heat thermal power control method based on a boiler waste heat system

Abstract

This invention relates to the field of waste heat power control technology for boiler waste heat systems, and more specifically to a waste heat power control method based on a boiler waste heat system. The method includes: a boiler waste heat system comprising: a hot water module on the boiler side and a cold water module on the water sales side, the hot water module and the cold water module being connected via a heat exchange device; acquiring operating parameters of the boiler-side equipment and adjusting the hot water flow rate in the hot water module; adjusting the cold water flow rate in the cold water module based on the temperature data after heat exchange, thereby achieving waste heat power control of the boiler waste heat system; effectively judging the normal operation of the turbine unit by monitoring the flue gas temperature and low-pressure steam flow rate; and adjusting the heat exchange efficiency of the boiler waste heat system by monitoring the temperature after heat exchange, thereby improving the stability of turbine unit operation.

Description

Technical Field

[0001] This invention relates to the field of waste heat power control technology for boiler waste heat systems, and more specifically to a waste heat power control method based on boiler waste heat systems. Background Technology

[0002] Power plants generate a lot of flue gas during power generation, which contains waste heat. By collecting and recovering this waste heat energy through boiler waste heat systems, it can be converted into other forms of energy (such as hot water, steam, or electricity). This can effectively improve energy efficiency and reduce energy consumption and environmental pollution.

[0003] During actual operation of the unit, the flue gas temperature is relatively high, and there is a certain energy-saving potential. Considering the actual situation of Suzhou Thermal Power Plant having end users who sell hot water, the waste heat of the waste heat boiler can be utilized, and the waste heat of the flue gas can be transferred to hot water for sale.

[0004] In boiler waste heat systems, the margin design of the low-pressure economizer in a typical waste heat boiler is around 10-20%. This means that, without affecting the design low-pressure steam flow (power output from make-up steam), the waste heat power of the tail flue gas needs to be controlled within this margin range. If the waste heat power extracted exceeds the design margin of the low-pressure economizer, it will lead to a decrease in the low-pressure steam flow, thereby affecting the electrical output of the low-pressure make-up steam section on the combined cycle turbine side.

[0005] Therefore, how to control the waste heat power of the boiler waste heat system is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the present invention provides a waste heat power control method based on a boiler waste heat system. By monitoring the flue gas temperature and low-pressure steam flow, the normal operation of the steam turbine unit can be effectively judged; by monitoring the temperature after heat exchange, the heat exchange efficiency of the boiler waste heat system can be adjusted, thereby improving the stability of the steam turbine unit operation.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] Preferably, the above-mentioned waste heat power control method based on a boiler waste heat system includes:

[0009] The boiler waste heat system includes a hot water module on the boiler side and a cold water module on the water sales side, wherein the hot water module and the cold water module are connected by a heat exchange device.

[0010] Obtain the operating parameters of the boiler-side equipment and adjust the hot water flow rate in the hot water module;

[0011] Based on the temperature data after heat exchange, the flow rate of the cold water module is adjusted to achieve waste heat power control of the boiler waste heat system.

[0012] Preferably, in the above-mentioned waste heat power control method based on a boiler waste heat system, the hot water module includes:

[0013] An economizer, connected to a waste heat boiler, is used to heat condensate into hot water for heat exchange.

[0014] A condensate pump is connected to the inlet of the economizer via a first condensate pipe;

[0015] The low-pressure steam drum is connected to the outlet of the economizer via a second condensate pipe;

[0016] The heat exchange device has its hot end inlet connected to the second condensate pipe via a first hot water pipe;

[0017] The first regulating valve is installed on the first hot water pipe;

[0018] The power unit has its inlet connected to the hot end outlet of the heat exchange device via a second hot water pipe; its outlet is connected to the first condensate pipe via a third hot water pipe.

[0019] Preferably, in the above-mentioned waste heat power control method based on a boiler waste heat system, the chilled water module includes:

[0020] A cold water pump is connected to the cold end inlet of the heat exchange device via a first cold water pipe;

[0021] The second regulating valve is installed on the first cold water pipe;

[0022] The hot water tank is connected to the cold end outlet of the heat exchange device via a second cold water pipe.

[0023] Preferably, in the above-mentioned waste heat power control method based on a boiler waste heat system, the step of acquiring the operating parameters of the boiler-side equipment and adjusting the hot water flow rate in the hot water module includes:

[0024] The water flow rate of the hot water module is adjusted according to the low-pressure steam flow rate of the steam turbine unit so that the low-pressure steam flow rate is greater than the preset steam flow rate threshold.

[0025] The water flow rate of the hot water module is adjusted according to the flue gas temperature of the economizer so that the flue gas temperature is greater than the preset flue gas temperature threshold.

[0026] Preferably, in the above-mentioned waste heat power control method based on a boiler waste heat system, the step of adjusting the water flow rate of the hot water module according to the low-pressure steam flow rate of the turbine unit, so that the low-pressure steam flow rate is greater than a preset steam flow rate threshold, includes:

[0027] The load data and steam consumption coefficient of the steam turbine unit are obtained to calculate the low-pressure steam flow rate and obtain the first steam value;

[0028] Historical low-pressure steam flow data is obtained, the coefficient of variation of low-pressure steam flow is calculated based on the historical low-pressure steam flow data, and the first steam value is corrected based on the coefficient of variation to obtain the steam flow threshold.

[0029] The system acquires low-pressure steam flow data from the turbine unit, preprocesses the low-pressure steam flow data, and calculates the real-time low-pressure steam flow rate of the turbine unit. If the real-time low-pressure steam flow rate is less than the steam flow rate threshold, the system acquires the liquid level data of the low-pressure steam drum. When the liquid level data exceeds a preset first liquid level threshold, the system uses the low-pressure steam drum to perform supplementary gas work. When the liquid level data is less than the preset first liquid level threshold, the system controls the first regulating valve to reduce the water flow rate of the hot water module.

[0030] Preferably, in the above-mentioned waste heat power control method based on a boiler waste heat system, the step of adjusting the water flow rate of the hot water module according to the flue gas temperature of the economizer to make the flue gas temperature greater than a preset flue gas temperature threshold includes:

[0031] The system acquires the exhaust gas temperature data of the economizer, preprocesses the data, and calculates the real-time exhaust gas temperature. When the real-time exhaust gas temperature is lower than the exhaust gas temperature threshold, the first regulating valve is controlled to reduce the water flow of the hot water module. When the real-time exhaust gas temperature exceeds the exhaust gas temperature threshold, the opening of the first regulating valve is corrected based on the difference between the real-time exhaust gas temperature and the exhaust gas temperature threshold. If the first regulating valve is at its maximum opening, the power of the power unit is adjusted to increase the water flow of the hot water module.

[0032] Preferably, in the above-mentioned waste heat power control method based on a boiler waste heat system, adjusting the cold water flow rate of the cold water module according to the temperature after heat exchange includes:

[0033] Based on the first temperature value of the third hot water pipe, the second regulating valve is controlled to make the first temperature value greater than the preset first temperature threshold.

[0034] Based on the second temperature value of the second cold water pipe, the second regulating valve is controlled to make the second temperature value greater than the preset second temperature threshold.

[0035] Preferably, in the above-mentioned waste heat power control method based on a boiler waste heat system, the step of controlling the second regulating valve according to the first temperature value of the third hot water pipe includes:

[0036] The temperature data of the third hot water pipe is acquired. After preprocessing the temperature data, the first temperature value of the third hot water pipe is calculated. When the first temperature value is less than the first temperature threshold, the opening of the second regulating valve is reduced to increase the first temperature value. When the first temperature value is greater than the first temperature threshold, the opening of the second regulating valve is corrected according to the difference between the first temperature and the first temperature threshold. If the second regulating valve is currently at its maximum opening, the power of the cold water pump is corrected.

[0037] Preferably, in the above-mentioned waste heat power control method based on a boiler waste heat system, the step of controlling the second regulating valve according to the second temperature value of the second cold water pipe includes:

[0038] The temperature data of the second cold water pipe is acquired. After preprocessing the temperature data, the second temperature value of the second cold water pipe is calculated. When the second temperature value is less than the second temperature threshold, the opening of the second regulating valve is reduced to increase the second temperature value. When the second temperature value is greater than the second temperature threshold, the opening of the second regulating valve is corrected according to the difference between the second temperature and the second temperature threshold. If the second regulating valve is currently at its maximum opening, the power of the cold water pump is corrected.

[0039] Preferably, the above-mentioned waste heat power control method based on a boiler waste heat system further includes: controlling the start-up and shutdown of the boiler waste heat system according to the second liquid level value of the hot water tank; stopping the boiler waste heat system when the second liquid level value exceeds a preset second liquid level threshold; and starting the boiler waste heat system when the second liquid level value is less than a preset third liquid level threshold.

[0040] As can be seen from the above technical solution, compared with the prior art, the beneficial effects of the present invention are as follows:

[0041] 1. By monitoring the flue gas temperature and low-pressure steam flow, the normal operation of the steam turbine unit can be effectively judged; by monitoring the temperature after heat exchange, the heat exchange efficiency of the boiler waste heat system can be adjusted, thereby improving the stability of the steam turbine unit operation. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0043] Figure 1 The attached figure is a flowchart illustrating the method of the present invention.

[0044] Figure 2 The attached figure is a schematic diagram of the boiler waste heat system of the present invention. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] In this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit 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 this invention.

[0048] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0049] Example 1

[0050] like Figure 1 As shown in the figure, an embodiment of the present invention discloses a waste heat power control method based on a boiler waste heat system, comprising:

[0051] The boiler waste heat system includes a hot water module on the boiler side and a cold water module on the water sales side, which are connected by a heat exchange device.

[0052] Obtain the operating parameters of the boiler-side equipment and adjust the hot water flow rate in the hot water module;

[0053] Based on the temperature data after heat exchange, the flow rate of the chilled water module is adjusted to control the waste heat power of the boiler waste heat system.

[0054] In the above embodiments, the data is acquired through various testing instruments and DCS systems within the power plant, which is existing technology.

[0055] The beneficial effects of the above embodiments are as follows: by monitoring the flue gas temperature and low-pressure steam flow, the normal operation of the steam turbine unit can be effectively judged; by monitoring the temperature after heat exchange, the heat exchange efficiency of the boiler waste heat system can be adjusted, thereby improving the stability of the steam turbine unit operation.

[0056] Example 2

[0057] like Figure 2 As shown, in one embodiment, a waste heat power control method based on a boiler waste heat system includes a hot water module, comprising:

[0058] An economizer, connected to a waste heat boiler, is used to heat condensate into hot water for heat exchange.

[0059] The condensate pump is connected to the economizer inlet via the first condensate pipe;

[0060] The low-pressure steam drum is connected to the economizer outlet via the second condensate pipe;

[0061] The heat exchanger has its hot end inlet connected to the second condensate pipe via a first hot water pipe;

[0062] The first regulating valve is installed on the first hot water pipe;

[0063] The power unit has its inlet connected to the hot end outlet of the heat exchanger via a second hot water pipe; its outlet is connected to the first condensate pipe via a third hot water pipe.

[0064] The chilled water module includes:

[0065] The cold water pump is connected to the cold end inlet of the heat exchange device via the first cold water pipe;

[0066] The second regulating valve is installed on the first cold water pipe;

[0067] The hot water tank is connected to the cold end outlet of the heat exchange device via a second cold water pipe.

[0068] In the above embodiments, all components and devices are existing technologies commonly known to those skilled in the art; such as Figure 2 As shown, in addition to the above-mentioned equipment, it also includes solenoid valves, check valves, and pressure regulating valves; the power unit in this embodiment is preferably a flue gas pump, with two units set up, one main and one backup.

[0069] Example 3

[0070] In one embodiment, a waste heat power control method based on a boiler waste heat system involves acquiring operating parameters of the boiler-side equipment and adjusting the hot water flow rate in the hot water module, including:

[0071] The water flow rate of the hot water module is adjusted according to the low-pressure steam flow rate of the steam turbine unit so that the low-pressure steam flow rate is greater than the preset steam flow rate threshold.

[0072] The water flow rate of the hot water module is adjusted according to the flue gas temperature of the economizer so that the flue gas temperature is greater than the preset flue gas temperature threshold.

[0073] Specifically, the water flow rate of the hot water module is adjusted based on the low-pressure steam flow rate of the steam turbine unit to ensure that the low-pressure steam flow rate exceeds a preset steam flow rate threshold, including:

[0074] The load data and steam consumption coefficient of the steam turbine unit are obtained to calculate the low-pressure steam flow rate and obtain the first steam value;

[0075] Obtain historical low-pressure steam flow data, calculate the coefficient of variation of low-pressure steam flow based on the historical low-pressure steam flow data, and correct the first steam value based on the coefficient of variation to obtain the steam flow threshold.

[0076] The system acquires low-pressure steam flow data from the turbine unit, preprocesses the low-pressure steam flow data, and calculates the real-time low-pressure steam flow rate of the turbine unit. If the real-time low-pressure steam flow rate is less than the steam flow rate threshold, the system acquires the liquid level data of the low-pressure steam drum. When the liquid level data exceeds a preset first liquid level threshold, the system uses the low-pressure steam drum to perform gas replenishment work. When the liquid level data is less than the preset first liquid level threshold, the system controls the first regulating valve to reduce the water flow rate of the hot water module.

[0077] In the above embodiments, the threshold for low-pressure steam flow rate varies according to the load changes of the turbine unit; the first liquid level threshold is set to account for changes in low-pressure steam flow rate when the turbine unit is subjected to load regulation, thus confirming that the turbine unit is operating normally. The first liquid level threshold is obtained based on experiments or the experience of the personnel.

[0078] In the above implementation, the first regulating valve is periodically regulated in a closed loop using unit adjustments; that is, the steam flow is assessed, and if the conditions are not met, the first regulating valve is adjusted by one unit opening; the steam flow is assessed again, and this process continues until the conditions are met. The length of the unit is set by the difference between a real-time value and a set threshold.

[0079] That is, the unit length B is determined based on the magnitude of the difference A:

[0080] A preset difference matrix A0 is defined as A0(A1, A2, A3, A4), where A1 is the first preset difference, A2 is the second preset difference, A3 is the third preset difference, and A4 is the fourth preset difference, and A1 < A2 < A3 < A4.

[0081] A preset unit length matrix B0 is defined as B0(B1, B2, B3, B4), where B1 is the first preset length, B2 is the second preset length, B3 is the third preset length, and B4 is the fourth preset length, and B1 < B2 < B3 < B4.

[0082] When A < A1, the first preset length B1 is selected as the adjustment unit for the opening of the first regulating valve;

[0083] When A1≤A<A2, the second preset length B2 is selected as the adjustment unit for the opening of the first regulating valve;

[0084] When A2≤A<A3, the third preset length B3 is selected as the adjustment unit for the opening of the first regulating valve;

[0085] When A3≤A<A4, the third preset length B4 is selected as the adjustment unit for the opening of the first regulating valve.

[0086] The process of adjusting the water flow rate of the hot water module based on the exhaust gas temperature of the economizer to ensure that the exhaust gas temperature exceeds a preset exhaust gas temperature threshold includes:

[0087] The system acquires the exhaust gas temperature data of the economizer, preprocesses the data, and calculates the real-time exhaust gas temperature. When the real-time exhaust gas temperature is lower than the exhaust gas temperature threshold, the first regulating valve is controlled to reduce the water flow of the hot water module. When the real-time exhaust gas temperature exceeds the exhaust gas temperature threshold, the opening of the first regulating valve is corrected based on the difference between the real-time exhaust gas temperature and the exhaust gas temperature threshold. If the first regulating valve is at its maximum opening, the power of the power unit is adjusted to increase the water flow of the hot water module.

[0088] The adjustment method for the first regulating valve and the power device in the above embodiments is the same as the adjustment method described above.

[0089] Example 4

[0090] In one embodiment, a waste heat power control method based on a boiler waste heat system adjusts the chilled water flow rate of a chilled water module according to the temperature data after heat exchange, including:

[0091] Based on the first temperature value of the third hot water pipe, the second regulating valve is controlled to make the first temperature value greater than the preset first temperature threshold.

[0092] Based on the second temperature value of the second cold water pipe, the second regulating valve is controlled to make the second temperature value greater than the preset second temperature threshold.

[0093] The second regulating valve is controlled based on the first temperature value of the third hot water pipe, including:

[0094] The temperature data of the third hot water pipe is acquired. After preprocessing the temperature data, the first temperature value of the third hot water pipe is calculated. When the first temperature value is less than the first temperature threshold, the opening of the second regulating valve is reduced to increase the first temperature value. When the first temperature value is greater than the first temperature threshold, the opening of the second regulating valve is corrected according to the difference between the first temperature and the first temperature threshold. If the second regulating valve is currently at its maximum opening, the power of the cold water pump is corrected.

[0095] In the above embodiments, the first temperature threshold is preferably 60°C.

[0096] The second regulating valve is controlled based on the second temperature value of the second cold water pipe, including:

[0097] The temperature data of the second cold water pipe is acquired. After preprocessing the temperature data, the second temperature value of the second cold water pipe is calculated. When the second temperature value is less than the second temperature threshold, the opening of the second regulating valve is reduced to increase the second temperature value. When the second temperature value is greater than the second temperature threshold, the opening of the second regulating valve is corrected according to the difference between the second temperature and the second temperature threshold. If the second regulating valve is currently at its maximum opening, the power of the cold water pump is corrected.

[0098] In the above embodiments, the second temperature threshold is preferably 80°C, which is set according to the negative impact of an acceptable decrease in electrical load.

[0099] In the above embodiments, the adjustment process of the second regulating valve and the cold water pump is similar to that in Embodiment 3.

[0100] Example 5

[0101] In one embodiment, a waste heat power control method based on a boiler waste heat system further includes: controlling the start-up and shutdown of the boiler waste heat system according to a second liquid level value of the hot water tank; stopping the boiler waste heat system when the second liquid level value exceeds a preset second liquid level threshold; and starting the boiler waste heat system when the second liquid level value is less than a preset third liquid level threshold.

[0102] In the above embodiments, it should be noted that when the waste heat system stops operating, it is necessary to slowly prevent hydrodynamic failure of the low-pressure steam drum. By setting a second liquid level value, the overall operating efficiency of the waste heat system is gradually reduced.

[0103] In the above embodiment, the third liquid level value is determined based on the sales situation of water.

[0104] It should be noted that the above embodiments are merely illustrative examples of the division of functional modules. In practical applications, the functions described above can be assigned to different functional modules as needed, that is, the modules or steps in the embodiments of the present invention can be further decomposed or combined. For example, the modules in the above embodiments can be merged into one module, or further divided into multiple sub-modules to complete all or part of the functions described above. The names of the modules and steps involved in the embodiments of the present invention are merely for distinguishing the various modules or steps and are not considered as an improper limitation of the present invention.

[0105] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent in such process, method, article, or apparatus / device.

[0106] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

[0107] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims and their equivalents, this invention is also intended to include these modifications and variations in the above description of the disclosed embodiments, enabling those skilled in the art to implement or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, this invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for controlling the thermal power of waste heat from a boiler waste heat system, characterized in that, include: Boiler waste heat system, including: The hot water module on the boiler side and the cold water module on the water sales side are connected by a heat exchange device. Obtain the operating parameters of the boiler-side equipment and adjust the hot water flow rate in the hot water module; The flow rate of the cold water module is adjusted according to the temperature after heat exchange to achieve waste heat power control of the boiler waste heat system. The hot water module includes: an economizer connected to a waste heat boiler, used to heat condensate into hot water for heat exchange; A condensate pump is connected to the inlet of the economizer via a first condensate pipe; The low-pressure steam drum is connected to the outlet of the economizer via a second condensate pipe; The heat exchange device has its hot end inlet connected to the second condensate pipe via a first hot water pipe; The first regulating valve is installed on the first hot water pipe; The power unit has its inlet connected to the hot end outlet of the heat exchange device via a second hot water pipe; its outlet is connected to the first condensate pipe via a third hot water pipe. The step of obtaining the operating parameters of the boiler-side equipment and adjusting the hot water flow rate in the hot water module includes: adjusting the water flow rate of the hot water module according to the low-pressure steam flow rate of the steam turbine unit, so that the low-pressure steam flow rate is greater than a preset steam flow rate threshold. The water flow rate of the hot water module is adjusted according to the flue gas temperature of the economizer so that the flue gas temperature is greater than the preset flue gas temperature threshold. The step of adjusting the water flow of the hot water module according to the low-pressure steam flow of the turbine unit to make the low-pressure steam flow greater than the preset steam flow threshold includes: obtaining the load data and steam consumption coefficient of the turbine unit to calculate the low-pressure steam flow and obtain a first steam value; Historical low-pressure steam flow data is obtained, the coefficient of variation of low-pressure steam flow is calculated based on the historical low-pressure steam flow data, and the first steam value is corrected based on the coefficient of variation to obtain the steam flow threshold. The system acquires low-pressure steam flow data from the turbine unit, preprocesses the low-pressure steam flow data, and calculates the real-time low-pressure steam flow rate of the turbine unit. If the real-time low-pressure steam flow rate is less than the steam flow rate threshold, the system acquires the liquid level data of the low-pressure steam drum. When the liquid level data exceeds a preset first liquid level threshold, the system uses the low-pressure steam drum to perform supplementary gas work. When the liquid level data is less than the preset first liquid level threshold, the system controls the first regulating valve to reduce the water flow rate of the hot water module.

2. The waste heat power control method based on a boiler waste heat system according to claim 1, characterized in that, The cold water module includes: a cold water pump, which is connected to the cold end inlet of the heat exchange device via a first cold water pipe; The second regulating valve is installed on the first cold water pipe; The hot water tank is connected to the cold end outlet of the heat exchange device via a second cold water pipe.

3. The waste heat power control method based on a boiler waste heat system according to claim 1, characterized in that, The step of adjusting the water flow rate of the hot water module based on the exhaust temperature of the economizer to make the exhaust temperature greater than a preset exhaust temperature threshold includes: acquiring the exhaust temperature data of the economizer; preprocessing the exhaust temperature data to calculate the real-time exhaust temperature of the economizer; when the real-time exhaust temperature is lower than the exhaust temperature threshold, controlling the first regulating valve to reduce the water flow rate of the hot water module; when the real-time exhaust temperature exceeds the exhaust temperature threshold, correcting the opening of the first regulating valve according to the difference between the real-time exhaust temperature and the exhaust temperature threshold; if the first regulating valve is at its maximum opening, correcting the power of the power unit to increase the water flow rate of the hot water module.

4. The waste heat power control method based on a boiler waste heat system according to claim 2, characterized in that, The flow rate of the cold water module is adjusted according to the temperature after heat exchange, including: controlling the second regulating valve according to the first temperature value of the third hot water pipe so that the first temperature value is greater than a preset first temperature threshold. Based on the second temperature value of the second cold water pipe, the second regulating valve is controlled to make the second temperature value greater than the preset second temperature threshold.

5. The waste heat power control method based on a boiler waste heat system according to claim 4, characterized in that, The step of controlling the second regulating valve based on the first temperature value of the third hot water pipe includes: acquiring temperature data of the third hot water pipe; preprocessing the temperature data; calculating the first temperature value of the third hot water pipe; when the first temperature value is less than the first temperature threshold, reducing the opening of the second regulating valve to increase the first temperature value; when the first temperature value is greater than the first temperature threshold, correcting the opening of the second regulating valve based on the difference between the first temperature and the first temperature threshold; and if the second regulating valve is currently at its maximum opening, correcting the power of the cold water pump.

6. The waste heat power control method based on a boiler waste heat system according to claim 4, characterized in that, The step of controlling the second regulating valve based on the second temperature value of the second cold water pipe includes: acquiring temperature data of the second cold water pipe; preprocessing the temperature data; calculating the second temperature value of the second cold water pipe; when the second temperature value is less than the second temperature threshold, reducing the opening of the second regulating valve to increase the second temperature value; when the second temperature value is greater than the second temperature threshold, correcting the opening of the second regulating valve based on the difference between the second temperature and the second temperature threshold; and if the second regulating valve is currently at its maximum opening, correcting the power of the cold water pump.

7. The waste heat power control method based on a boiler waste heat system according to claim 2, characterized in that, Also includes: The start-up and shutdown of the boiler waste heat system are controlled based on the second liquid level value of the hot water tank. When the second liquid level exceeds the preset second liquid level threshold, the boiler waste heat system is stopped; when the second liquid level is less than the preset third liquid level threshold, the boiler waste heat system is turned on.

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