Boiler oxygenation control method, device and boiler

Abstract

The present invention provides a boiler oxygenation control method, device, and boiler, relating to the field of boiler oxygenation. The boiler oxygenation control method comprises: obtaining a unit load instruction; determining the unit's peak load, peak rate, and peak frequency based on the unit load instruction; and adjusting the boiler oxygenation amount based on the peak load, peak rate, and peak frequency within a preset time period after obtaining the unit load instruction and before the unit begins peaking. By obtaining the unit load instruction and determining the peak load, peak rate, and peak frequency based on the unit load instruction, the boiler oxygenation control method can adjust the boiler oxygenation amount in advance compared to the existing technology, thereby greatly improving the oxygenation delay phenomenon, improving the matching degree between the dissolved oxygen content of the water system and the unit load, and thus improving the oxygenation accuracy. Furthermore, it can effectively avoid the phenomenon of reduced water system protection effect caused by insufficient oxygenation and the flaking of steam system oxide scale caused by excessive oxygenation, thereby improving the protection effect.

Description

Technical Field

[0001] The present invention relates to the technical field of boiler oxygenation, and in particular to a boiler oxygenation control method, device and boiler. Background Art

[0002] Oxygenation treatment of boiler feed water has very significant advantages in practical applications. It can solve the flow-accelerated corrosion of the water supply system and high-pressure water heater drain system and a series of problems it brings, thereby extending the service life of the boiler.

[0003] In existing technology, oxygenation points and sampling points are typically set up in the water vapor system, and the oxygen addition rate is adjusted based on the dissolved oxygen value at the sampling point and the target value corresponding to the unit load. However, from the start of oxygenation until the dissolved oxygen value reaches the target value, the dissolved oxygen value in the water system of the water vapor system does not match the unit load, resulting in low oxygenation accuracy. When encountering operating conditions such as frequent peak load regulation and start-stop operations, the unit load fluctuates greatly, and the oxygenation rate also fluctuates greatly, further reducing oxygenation accuracy. Summary of the Invention

[0004] The first object of the present invention is to provide a boiler oxygenation control method to solve the technical problem of low oxygenation accuracy in the prior art oxygenation method.

[0005] The boiler oxygenation control method provided by the present invention comprises:

[0006] Obtain unit load instructions;

[0007] Determining the peak load, peak rate, and peak frequency of the unit according to the unit load instruction;

[0008] Within a preset time period after obtaining the unit load instruction and before the unit starts peak regulation, the boiler oxygen addition amount is adjusted according to the peak regulation load, the peak regulation rate and the peak regulation frequency.

[0009] The boiler oxygenation control method provided by the present invention can produce the following beneficial effects:

[0010] The boiler oxygenation control method provided by the present invention obtains a unit load instruction and determines the peak-shaving load, peak-shaving rate and peak-shaving frequency according to the unit load instruction. It can adjust the boiler oxygenation amount in advance compared with the existing technology, thereby greatly improving the oxygenation delay phenomenon and improving the matching degree between the dissolved oxygen content of the water system and the unit load, that is, improving the oxygenation accuracy, and thus effectively avoiding the reduction of the water system protection effect caused by insufficient oxygenation and the phenomenon of steam system oxide scale peeling caused by excessive oxygenation, thereby improving the protection effect.

[0011] Furthermore, the step of adjusting the boiler oxygen addition amount according to the peak load includes: obtaining the corresponding relationship between the unit load and the boiler oxygen addition amount according to the historical operation curve of the unit; and determining the boiler oxygen addition amount corresponding to the peak load according to the corresponding relationship.

[0012] Under this technical solution, the optimization is sought from the historical operating curve of the unit, and oxygen is added according to the optimal boiler oxygen addition amount or water system dissolved oxygen amount corresponding to different loads. This is conducive to matching the unit with the optimal dissolved oxygen amount under different loads, thereby further improving the oxygen addition accuracy.

[0013] Furthermore, the step of adjusting the boiler oxygen addition amount according to the peak load includes: if the peak load is less than or equal to the preset load lower limit, stopping oxygen addition and changing the operating condition from the oxygen addition condition to the oxidative full volatilization treatment condition.

[0014] Under this technical solution, when the peak load is small, oxygen addition is stopped, which can effectively avoid excessive oxygen addition, thereby better protecting the equipment and ensuring a certain level of oxygen addition accuracy.

[0015] Furthermore, the step of adjusting the oxygen addition amount of the boiler according to the peak regulation rate includes: if the peak regulation rate is greater than or equal to a preset first rate, adopting constant oxygen addition.

[0016] Under this technical solution, when the peak rate is too fast, constant oxygenation is adopted, which can control the dissolved oxygen content error to a relatively low level, thereby improving the accuracy of oxygenation. In addition, constant oxygenation when the peak rate is too fast also helps to protect the safety of oxygenation equipment, avoid mechanical failures caused by frequent adjustments of electric valves, and extend the service life of the equipment.

[0017] Furthermore, the step of adjusting the oxygen addition amount of the boiler according to the peak regulation rate also includes: if the peak regulation rate is less than or equal to a preset second rate, constant oxygen addition is also adopted, and the preset second rate is less than the preset first rate.

[0018] Under this technical solution, when the peak regulation rate is relatively slow, constant oxygenation is adopted, which can effectively control the error and also avoid mechanical failures caused by adjustments such as electric valves, which is beneficial to protecting the safety of oxygenation equipment and extending the service life of the equipment.

[0019] Furthermore, the step of adjusting the oxygen addition amount of the boiler according to the peak-shaving frequency includes: if the peak-shaving frequency is greater than or equal to a preset frequency upper limit, adopting constant oxygen addition.

[0020] Under this technical solution, the oxygenation method is adjusted according to the peak-shaving frequency, which can take into account both the oxygenation accuracy and the protection of equipment. While improving the protection effect, it can also improve the mechanical protection of equipment such as electric valves.

[0021] Furthermore, the preset duration ranges from 0s to 600s.

[0022] Furthermore, the preset duration is 300s.

[0023] The second object of the present invention is to provide a boiler oxygenation control device to solve the technical problem of low oxygenation accuracy in the prior art oxygenation method.

[0024] The boiler oxygenation control device provided by the present invention is applied to a boiler and is used to implement the above-mentioned boiler oxygenation control method. The boiler oxygenation control device includes an instruction acquisition module, a parameter determination module and an advance adjustment module. The instruction acquisition module is used to obtain a unit load instruction; the parameter determination module is used to determine the unit's peak-shaving load, peak-shaving rate and peak-shaving frequency according to the unit load instruction; the advance adjustment module is used to adjust the boiler oxygen addition amount according to the peak-shaving load, the peak-shaving rate and the peak-shaving frequency within a preset time after obtaining the unit load instruction and before the unit starts peak-shaving.

[0025] The boiler oxygenation control device provided by the present invention can implement the above-mentioned boiler oxygenation control method, and thus can obtain all the beneficial effects of the above-mentioned boiler oxygenation control method, which will not be described in detail here.

[0026] The third object of the present invention is to provide a boiler to solve the technical problem of low oxygenation accuracy in the prior art oxygenation method.

[0027] The boiler provided by the present invention includes a computer-readable storage medium storing a computer program and a processor. When the computer program is read and executed by the processor, the above method is implemented.

[0028] The boiler provided by the present invention can implement the above-mentioned boiler oxygenation control method, and thus can obtain all the beneficial effects of the above-mentioned boiler oxygenation control method, which will not be described in detail here.

[0029] A fourth object of the present invention is to provide a computer-readable storage medium to solve the technical problem of low oxygenation accuracy in the prior art oxygenation method.

[0030] The computer-readable storage medium provided by the present invention stores a computer program, and when the computer program is read and executed by a processor, the above method is implemented.

[0031] The computer-readable storage medium provided by the present invention can implement the above-mentioned boiler oxygenation control method when the stored computer program is read and executed by a processor, so all the beneficial effects of the above-mentioned boiler oxygenation control method can be obtained, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0033] Figure 1 A flow chart of a boiler oxygenation control method provided in an embodiment of the present invention;

[0034] Figure 2 This is a structural block diagram of a boiler oxygenation control device provided in an embodiment of the present invention.

[0035] Description of reference numerals:

[0036] 100-instruction acquisition module; 200-parameter determination module; 300-advance adjustment module. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the following detailed description of the specific embodiments of the present invention is given in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] This embodiment provides a boiler oxygenation control method, such as Figure 1 As shown, the boiler oxygenation control method includes:

[0039] S100, obtaining the unit load instruction; specifically, the unit load instruction is the output power required to be achieved by the unit, such as 1000MW. During normal operation of the unit, its load is usually controlled by load instructions from three aspects, namely: ① load instruction from the grid control center, also known as the Automatic Generation Control (AGC) instruction; ② local load instruction under non-CCS (Coordination Control System) control mode; ③ load instruction required by the grid frequency regulation during a primary frequency regulation action, ① and ③ are given by the grid dispatcher, and ② is given by the operator.

[0040] S200, determining the peak load, peak rate, and peak frequency of the unit according to the unit load instruction;

[0041] S300, within a preset time period after obtaining the unit load instruction and before the unit starts peak regulation, adjust the boiler oxygen addition amount according to the peak regulation load, peak regulation rate and peak regulation frequency.

[0042] Specifically, in this embodiment, the preset duration can range from 0s to 600s. If the preset duration is 0s, oxygen addition is adjusted immediately after obtaining the unit load instruction and determining the peak load, peak rate, and peak frequency. If the preset duration is 600s, oxygen addition is adjusted within 10 minutes after obtaining the unit load instruction and determining the peak load, peak rate, and peak frequency. Furthermore, the preset duration can be set to 300s, which is a moderate length that both improves oxygenation accuracy and allows sufficient preparation time for personnel and equipment.

[0043] The boiler oxygenation control method provided in this embodiment obtains unit load instructions and determines the peak load, peak rate, and peak frequency based on the unit load instructions. This allows for pre-emptive adjustment of the boiler oxygenation rate compared to existing technologies. This significantly reduces oxygenation delays and improves the matching of the water system's dissolved oxygen content with the unit load, thereby increasing oxygenation accuracy. This effectively avoids reduced water system protection due to insufficient oxygenation and steam system oxide scale flaking due to excessive oxygenation, thereby enhancing protection effectiveness. In particular, under operating conditions such as frequent peak-shaving starts and stops, the boiler oxygenation control method provided in this embodiment, due to its ability to pre-emptively add oxygen, can significantly improve the matching of the water system's dissolved oxygen content with the unit load, thereby significantly improving oxygenation accuracy and enhancing protection effectiveness.

[0044] Specifically, in this embodiment, the step of adjusting the boiler oxygen addition rate based on the peak load includes: obtaining a correspondence between the unit load and the boiler oxygen addition rate based on the unit's historical operating curve; and determining the boiler oxygen addition rate corresponding to the peak load based on the correspondence. Optimizing the unit's historical operating curve and adding oxygen based on the optimal boiler oxygen addition rate or water system dissolved oxygen level corresponding to different loads facilitates matching the unit with the optimal dissolved oxygen level under different loads, thereby further improving oxygen addition accuracy.

[0045] Specifically, in this embodiment, the step of adjusting the boiler oxygen addition rate based on the peak load includes: if the peak load is less than or equal to a preset lower load limit, oxygen addition is stopped, and the operating mode is switched from the oxygenation mode to the oxidative all-volatile treatment mode. In this embodiment, the preset lower load limit can be set to 20% of the unit's rated load. That is, when the peak load is less than or equal to 20% of the unit's rated load, oxygen addition is stopped, and the operating mode is switched from the OT (oxygenated treatment) mode to the AVT(O) (all-volatile treatment (oxidation) mode. In the AVT(O) mode, no oxygen is added, and only water is added and the pH value of the water vapor system is adjusted. Stopping oxygen addition when the peak load is low can effectively avoid excessive oxygen addition, thereby better protecting equipment and ensuring a certain level of oxygen addition accuracy.

[0046] Specifically, in this embodiment, the step of adjusting the amount of oxygen added to the boiler according to the peak shaving rate includes: if the peak shaving rate is greater than or equal to the preset first rate, constant oxygen addition is adopted. Among them, in this embodiment, the preset first rate can be set to 30MW / min, that is, if the peak shaving rate is greater than or equal to 30MW / min, constant oxygen addition is adopted. If the oxygen addition amount is still adjusted continuously when the peak shaving rate is too fast, the error in the dissolved oxygen amount will be large; in this embodiment, when the peak shaving rate is too fast, constant oxygen addition is adopted, the error in the dissolved oxygen amount can be controlled at a relatively low level, thereby improving the accuracy of oxygen addition. In addition, constant oxygen addition when the peak shaving rate is too fast is also beneficial to protecting the safety of oxygenation equipment, avoiding mechanical failures caused by frequent adjustments of electric valves, etc., and extending the service life of the equipment.

[0047] Specifically, in this embodiment, the step of pre-adjusting the boiler oxygen addition rate based on the peak-shaving rate further includes: if the peak-shaving rate is less than or equal to a preset second rate, constant oxygen addition is also implemented, where the preset second rate is less than the preset first rate. In this embodiment, the preset second rate can be set to 5 MW / min. That is, constant oxygen addition is also implemented if the peak-shaving rate is less than or equal to 5 MW / min. When the peak-shaving rate is relatively slow, constant oxygen addition can effectively control errors and also avoid mechanical failures caused by adjustments such as electric valves, thereby protecting the safety of the oxygenation equipment and extending its service life.

[0048] Specifically, in this embodiment, the step of adjusting the oxygen addition amount of the boiler according to the peak shaving frequency includes: if the peak shaving frequency is greater than or equal to a preset frequency upper limit, adopting constant oxygen addition.

[0049] More specifically, in this embodiment, it can be stipulated that if the peak load exceeds 80% of the unit's rated load or falls below 20% of the unit's rated load 20 times within 24 hours, constant oxygenation is implemented. That is, in this embodiment, the preset frequency upper limit can be set to 20 times. Adjusting the oxygenation method based on the peak load frequency can balance oxygenation accuracy and equipment protection, improving the oxygenation protection effect while also enhancing the mechanical protection of equipment such as electric valves.

[0050] Of course, in other embodiments of the present application, the preset frequency can also be set to other values ​​according to the specific circumstances of the unit, for example: 10 times. Moreover, the monitoring time is not limited to 24 hours, and the upper and lower limits of the peak load fluctuation are not limited to 80% and 20% of the unit's rated load.

[0051] Furthermore, in this embodiment, when the peak shaving frequency is less than 20 times, the method of adding oxygen in advance according to the peak shaving load is continued.

[0052] This embodiment also provides a boiler oxygenation control device, such as Figure 2 As shown, the boiler oxygenation control device is applied to a boiler to implement the above-mentioned boiler oxygenation control method. The boiler oxygenation control device includes an instruction acquisition module 100, a parameter determination module 200 and an advance adjustment module 300. The instruction acquisition module 100 is used to obtain the unit load instruction; the parameter determination module 200 is used to determine the peak load, peak rate and peak frequency of the unit according to the unit load instruction; the advance adjustment module 300 is used to adjust the boiler oxygen addition amount according to the peak load, peak rate and peak frequency within a preset time after obtaining the unit load instruction and before the unit starts peaking.

[0053] This embodiment further provides a boiler, comprising a computer-readable storage medium storing a computer program and a processor, wherein the computer program, when read and executed by the processor, can implement the above-mentioned method. Specifically, in this embodiment, the boiler can be a peak-shaving unit boiler, but is not limited thereto.

[0054] This embodiment further provides a computer-readable storage medium, which stores a computer program. When the computer program is read and executed by a processor, the above method can be implemented.

[0055] The boiler oxygenation control device, boiler, and computer-readable storage medium provided in this embodiment can all implement the above-mentioned boiler oxygenation control method, and thus can obtain all the beneficial effects of the above-mentioned boiler oxygenation control method, which will not be described in detail here.

[0056] Finally, it should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include," "comprise," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0057] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to the embodiments will be readily apparent to one 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 present invention. Therefore, the present invention is not limited to the embodiments shown herein but is to be construed in the widest manner consistent with the principles and novel features disclosed herein.

Claims

1. A boiler oxygenation control method, characterized in that: include: Obtain unit load instructions; Determining the peak load, peak rate, and peak frequency of the unit according to the unit load instruction; Within a preset time after obtaining the unit load instruction and before the unit starts peak regulation, adjust the boiler oxygen addition amount according to the peak regulation load, the peak regulation rate and the peak regulation frequency; the value range of the preset time is 0s~600s; The step of adjusting the boiler oxygen addition amount according to the peak load comprises: obtaining a correspondence between the unit load and the boiler oxygen addition amount according to a historical operation curve of the unit; determining the boiler oxygen addition amount corresponding to the peak load according to the correspondence; and if the peak load is less than or equal to a preset load lower limit, stopping oxygen addition and switching the operating condition from the oxygen addition operating condition to the oxidative full volatilization treatment operating condition; The step of adjusting the oxygen addition amount of the boiler according to the peak shaving rate includes: if the peak shaving rate is greater than or equal to a preset first rate, adopting constant oxygen addition; if the peak shaving rate is less than or equal to a preset second rate, also adopting constant oxygen addition, wherein the preset second rate is less than the preset first rate; The step of adjusting the oxygen addition amount of the boiler according to the peak-shaving frequency includes: if the peak-shaving frequency is greater than or equal to a preset frequency upper limit, adopting constant oxygen addition.

2. A boiler oxygenation control device, characterized in that: Applied to a boiler, for implementing the boiler oxygenation control method according to claim 1, the boiler oxygenation control device comprises: An instruction acquisition module (100) is used to acquire a unit load instruction; A parameter determination module (200) is used to determine the peak load, peak rate and peak frequency of the unit according to the unit load instruction; and The advance adjustment module (300) is used to adjust the boiler oxygen addition amount according to the peak-shaving load, the peak-shaving rate and the peak-shaving frequency within a preset time period after obtaining the unit load instruction and before the unit starts peak-shaving.

3. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is read and executed by a processor, the method according to claim 1 is implemented.

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