Boiler condensate water side oxygenation control method, device, equipment and storage medium

Abstract

This application discloses a method, apparatus, equipment, and storage medium for controlling oxygenation on the condensate side of a boiler. The method includes: acquiring the current feedwater flow rate, oxygen demand density, lower limit of oxygenation flow rate, target dissolved oxygen value, and current dissolved oxygen value at a dissolved oxygen tracking point on the boiler condensate side; when the current dissolved oxygen value is less than the target dissolved oxygen value, determining the oxygen demand mass corresponding to a target time period based on the current feedwater flow rate, target dissolved oxygen value, and current dissolved oxygen value; determining the oxygenation flow rate control value for oxygenation on the boiler condensate side based on the oxygen demand mass, oxygen demand density, and target time period; and performing oxygenation on the boiler condensate side based on the oxygenation flow rate control value. This application achieves precise oxygenation by determining the oxygen demand based on the real-time feedwater flow rate on the boiler condensate side, thereby enabling preferential adaptive adjustment of the oxygenation amount when the feedwater flow rate changes, thus solving the problem of large fluctuations in oxygenation control caused by factors such as feedwater flow rate changes and oxygenation lag.

Description

Technical Field

[0001] This application relates to the field of boiler condensate treatment technology, and in particular to a method, apparatus, equipment and storage medium for controlling oxygenation on the condensate side of a boiler. Background Technology

[0002] The operating efficiency and stability of the boiler feedwater system have a significant impact on the overall operation of a thermal power plant. The traditional boiler feedwater method mainly adopts AVT (All Volatile Treatment), but this method has problems such as high iron content in the feedwater, high scaling rate in pipelines, short boiler acid washing cycle, high water treatment agent content, and easy to cause flow-accelerated corrosion.

[0003] To address these issues, major power plants in China have switched to oxygenating boiler feedwater. This method introduces oxygen into both the feedwater and condensate sides, resolving the problems inherent in the AVT (Automatic Water Transmission) method. It significantly suppresses the accelerated corrosion phenomenon caused by feedwater and condensate flow, substantially reduces the transfer rate of corrosion products in the thermal system, significantly lowers the boiler deposition rate, extends the boiler acid cleaning cycle, improves steam and water quality, and enhances the safety and economy of boiler operation.

[0004] However, since the boiler feedwater oxygenation system is a system with a large time lag, and the existing boiler feedwater oxygenation methods are usually based on fuzzy control according to the difference between the target dissolved oxygen value and the current dissolved oxygen value, when affected by factors such as changes in feedwater flow rate, there will be large fluctuations in oxygenation control and unstable oxygenation. As a result, the Fe2O3 film formed on the inner wall of the boiler system pipes is not dense, which affects the oxygenation effect of the boiler system. Summary of the Invention

[0005] This invention provides a method, apparatus, equipment, and storage medium for controlling oxygenation on the condensate side of a boiler, in order to solve the problem of large fluctuations in oxygenation control caused by factors such as changes in feedwater flow and oxygenation lag.

[0006] In a first aspect, embodiments of the present invention provide a method for controlling oxygenation on the condensate side of a boiler, the method comprising:

[0007] Obtain the current feedwater flow rate, oxygen density to be added, lower limit of oxygen addition flow rate, target dissolved oxygen value and current dissolved oxygen value at the dissolved oxygen tracking point on the boiler condensate side;

[0008] When the current dissolved oxygen value is less than the target dissolved oxygen value, the oxygenation mass to be added for the target time period is determined based on the current water supply flow rate, the target dissolved oxygen value, and the current dissolved oxygen value.

[0009] The oxygenation flow control value for oxygenating the boiler condensate side is determined based on the oxygenation mass to be added, the oxygenation density to be added, the lower limit of the oxygenation flow rate, and the target time period.

[0010] Oxygen is added to the condensate side of the boiler according to the oxygen flow control value.

[0011] Secondly, embodiments of the present invention also provide a boiler condensate side oxygenation control device for implementing the boiler condensate side oxygenation control method as described above. The device includes:

[0012] The first acquisition module is used to acquire the current feedwater flow rate, oxygen density to be added, lower limit of oxygen addition flow rate, target dissolved oxygen value and current dissolved oxygen value of dissolved oxygen tracking point on the boiler condensate side.

[0013] The first dissolved oxygen comparison module is used to compare the target dissolved oxygen value with the current dissolved oxygen value;

[0014] The quality determination module is used to determine the oxygenation mass corresponding to the target time period based on the current water supply flow rate, the target dissolved oxygen value, and the current dissolved oxygen value when the current dissolved oxygen value is less than the target dissolved oxygen value.

[0015] The first flow rate determination module is used to determine the oxygenation flow rate control value for oxygenating the condensate side of the boiler based on the oxygenation mass to be added, the oxygenation density to be added, the lower limit of the oxygenation flow rate, and the target time period.

[0016] The condensate oxygenation module is used to oxygenate the condensate side of the boiler according to the oxygenation flow control value.

[0017] Thirdly, embodiments of the present invention also provide a boiler condensate side oxygenation device, the device comprising: one or more processors;

[0018] Storage device for storing one or more programs;

[0019] The one or more programs are executed by the one or more processors, causing the one or more processors to implement the boiler condensate side oxygenation control method as described in the first aspect of the present invention.

[0020] Fourthly, embodiments of the present invention also provide a storage medium storing a computer program thereon, which, when executed by a processor, implements the boiler condensate side oxygenation control method as described in the first aspect of the present invention.

[0021] This application obtains the current feedwater flow rate, oxygen demand density, lower limit of oxygenation flow rate, target dissolved oxygen value, and current dissolved oxygen value at the dissolved oxygen tracking point on the boiler condensate side. When the current dissolved oxygen value is less than the target dissolved oxygen value, it determines the oxygen demand mass corresponding to the target time period, and then determines the oxygenation flow rate control value for oxygenation on the boiler condensate side. Oxygenation is then performed on the boiler condensate side according to the oxygenation flow rate control value, thereby realizing automatic and precise oxygenation based on the real-time feedwater flow rate on the boiler condensate side to determine the oxygen demand. This allows for adaptive adjustment of the oxygenation amount when the feedwater flow rate changes, thus solving the problem of large fluctuations in oxygenation control caused by factors such as feedwater flow rate changes and oxygenation lag. Attached Figure Description

[0022] Figure 1 This is a schematic flowchart of a boiler condensate side oxygenation control method provided in Embodiment 1 of the present invention;

[0023] Figure 2 This is a schematic flowchart of a boiler condensate side oxygenation control method provided in Embodiment 2 of the present invention;

[0024] Figure 3 This is a schematic flowchart of a boiler condensate side oxygenation control method provided in Embodiment 3 of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of a boiler condensate side oxygenation control device provided in Embodiment 4 of the present invention;

[0026] Figure 5 This is a schematic diagram of a boiler condensate side oxygenation device provided in Embodiment 5 of the present invention. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, the embodiments and features described herein can be combined with each other unless otherwise specified. It should also be noted that, for ease of description, only the parts relevant to the present invention are shown in the drawings, not the entire structure.

[0028] Example 1

[0029] Figure 1 This is a flowchart illustrating a boiler condensate side oxygenation control method according to Embodiment 1 of the present invention. This embodiment is applicable to situations where the oxygen demand is determined based on the real-time feedwater flow rate on the boiler condensate side and oxygenation is performed automatically and precisely. This method can be executed by the boiler condensate side oxygenation equipment in this embodiment of the present invention.

[0030] It is understandable that changes in the feedwater flow rate on the boiler condensate side will affect the gas-liquid mass transfer efficiency of the oxygenation process, the adjustment frequency of the oxygenation control system, and the accuracy of oxygenation control. Furthermore, due to the lag in oxygenation and the influence of fuzzy control, it is difficult to guarantee the stability of oxygenation, and it is easy to experience excessive fluctuations in oxygenation control (i.e., excessive fluctuations in the amplitude of the oxygenation time curve). Fluctuations in oxygenation control can lead to uneven oxygenation, unstable chemical conditions required for Fe2O3 film formation, discontinuous Fe2O3 film layers, and affect the deposition, adhesion, and crystallization processes of Fe2O3 on the inner wall of the pipe. It can also impact the repair and regeneration capabilities and physicochemical properties of the Fe2O3 film, thus affecting its uniformity, integrity, and density. (Fluctuations in oxygenation control cause unstable dissolved oxygen concentrations in the feedwater, fluctuating between high and low levels. This unevenness leads to local differences in oxygen concentration during Fe2O3 film formation, affecting the formation rate and quality of Fe2O3. While Fe2O3 formation may be faster in areas with higher oxygen concentrations, excessive fluctuations can cause uneven film layers, affecting its density.) This invention proposes a boiler condensate-side oxygenation control method that determines the required oxygenation amount based on the real-time feedwater flow rate, and then precisely adds oxygen based on this determined amount, thereby avoiding large fluctuations in oxygenation control caused by excessive adjustments.

[0031] like Figure 1 As shown, the boiler condensate side oxygenation control method described in this embodiment specifically includes the following steps:

[0032] S100: Obtain the current feedwater flow rate, oxygen density to be added, lower limit of oxygenation flow rate, target dissolved oxygen value and current dissolved oxygen value of the dissolved oxygen tracking point on the boiler condensate side.

[0033] Among them, the current feedwater flow rate refers to the current flow rate of the boiler condensate side; the oxygen density to be added refers to the density of oxygen added to the boiler condensate side; the lower limit of oxygenation flow rate refers to the minimum oxygenation flow rate value for adding oxygen to the boiler condensate side; the dissolved oxygen tracking point refers to the dissolved oxygen monitoring point on the boiler condensate side; the target dissolved oxygen value refers to the dissolved oxygen target value set by the user on the boiler condensate side (which can be used as the dissolved oxygen target value of the dissolved oxygen tracking point); and the current dissolved oxygen value refers to the dissolved oxygen value monitored by the dissolved oxygen tracking point at the current moment.

[0034] Optionally, the dissolved oxygen tracking point can be the condensate pump outlet and / or the deaerator inlet.

[0035] Optionally, the current water supply flow rate is in "tons per hour (t / h)", the oxygen density to be added is in "grams per liter (g / L)", the oxygenation flow rate is in "liters per hour (L / h)", and the target dissolved oxygen value and the current dissolved oxygen value are in "micrograms per liter (μg / L)".

[0036] In one embodiment, the current feedwater flow rate is measured by a flow meter, the current dissolved oxygen value is measured by a dissolved oxygen meter, and the data are collected and summarized by a DCS (Distributed Control System) and then transmitted to the boiler condensate side oxygenation control system (i.e., the execution subject of the boiler condensate side oxygenation control method described in this embodiment of the invention).

[0037] In one embodiment, the current feedwater flow rate on the boiler feedwater side is used to approximate the current feedwater flow rate on the boiler condensate side.

[0038] S110. Compare the target dissolved oxygen value with the current dissolved oxygen value.

[0039] It is understandable that when the current dissolved oxygen value is less than the target dissolved oxygen value, oxygen needs to be added to the boiler condensate side. The key to this embodiment of the invention is to obtain the mass of oxygen to be added under the current feedwater flow rate, and then to perform precise oxygenation.

[0040] S120. When the current dissolved oxygen value is less than the target dissolved oxygen value, determine the amount of oxygen to be added for the target time period based on the current water supply flow rate, the target dissolved oxygen value, and the current dissolved oxygen value.

[0041] It is understandable that the product of the current feedwater flow rate and the target time period represents the volume of condensate flowing through the target time period at the current feedwater flow rate. The product of the condensate volume corresponding to the target time period and the target dissolved oxygen value represents the dissolved oxygen content (target dissolved oxygen mass) in the condensate volume corresponding to the target time period after the dissolved oxygen value of the boiler condensate reaches the target dissolved oxygen value. Correspondingly, the product of the condensate volume corresponding to the target time period and the current dissolved oxygen value represents the dissolved oxygen content (current dissolved oxygen mass) in the condensate volume corresponding to the target time period when the dissolved oxygen value of the boiler condensate is the current dissolved oxygen value. Therefore, by obtaining the difference between the target dissolved oxygen mass and the current dissolved oxygen mass, the mass of oxygen required to raise the dissolved oxygen value of the boiler condensate to the target dissolved oxygen value within the target time period can be determined.

[0042] S130. Determine the oxygenation flow control value for oxygenation on the boiler condensate side based on the oxygenation mass, oxygenation density, lower limit of oxygenation flow rate, and target time period.

[0043] Among them, the oxygenation flow control value can be understood as the oxygenation flow rate value set when oxygenating the condensate side of the boiler.

[0044] Understandably, after obtaining the oxygen mass to be added corresponding to the target time period, the oxygen volume to be added can be obtained based on the oxygen mass and oxygen density. Then, the average oxygen flow rate corresponding to adding oxygen to the oxygen volume within the target time period can be obtained. Subsequently, a range of oxygen flow rates for adding oxygen to the boiler condensate side can be determined by comparing this range with the user-set lower limit value of the oxygen flow rate. Finally, the oxygen flow rate control value for adding oxygen to the boiler condensate side can be determined based on this range.

[0045] It should be noted that the oxygenation flow control value can be a fixed value within a defined range, or a fluctuating value within the defined range. By adaptively adjusting the oxygenation flow control value in conjunction with changes in the feedwater flow rate, the time curve of the oxygenation flow control value can be made smoother, thereby further reducing fluctuations in oxygenation control. This application does not limit the specific method for allowing the oxygenation flow control value to fluctuate within the defined range.

[0046] In one embodiment, the time curve of the oxygen supply flow control value can be monitored by a host computer, a curve fluctuation threshold can be set, and the curve fluctuation can be reduced by adaptively adjusting the value of the oxygen supply flow control value.

[0047] S140. Oxygenate the boiler condensate side according to the oxygen flow control value.

[0048] Understandably, after determining the oxygen flow rate control value, the control system can generate a corresponding oxygen flow rate adjustment command to control the relevant units to adjust the oxygen flow rate to the determined oxygen flow rate control value.

[0049] It should be noted that this application does not limit the specific front-end execution unit for implementing oxygen flow rate regulation, as long as it can receive and execute the oxygen flow rate regulation command generated by the control system.

[0050] This invention acquires the current feedwater flow rate, oxygen demand density, lower limit of oxygenation flow rate, target dissolved oxygen value, and current dissolved oxygen value at a dissolved oxygen tracking point on the boiler condensate side. When the current dissolved oxygen value is less than the target dissolved oxygen value, the required oxygen mass for the target time period is determined, and then the oxygenation flow rate control value for oxygenation on the boiler condensate side is determined. Oxygenation is then performed on the boiler condensate side according to the oxygenation flow rate control value, thereby achieving automatic and precise oxygenation based on the real-time feedwater flow rate on the boiler condensate side. This allows for adaptive adjustment of the oxygenation amount when the feedwater flow rate changes, thus solving the problem of large fluctuations in oxygenation control caused by changes in feedwater flow rate and oxygenation lag.

[0051] Example 2

[0052] Figure 2This is a flowchart illustrating a boiler condensate-side oxygenation control method according to Embodiment 2 of the present invention, which is a further optimization based on Embodiment 1. In this embodiment, determining the oxygenation mass corresponding to the target time period based on the current feedwater flow rate, the target dissolved oxygen value, and the current dissolved oxygen value is specifically defined as follows: obtaining the difference between the target dissolved oxygen value and the current dissolved oxygen value; obtaining the total water volume flowing through the boiler condensate side within the target time period while keeping the current feedwater flow rate constant; and obtaining the product of the difference and the total water volume to obtain the oxygenation mass.

[0053] Further, in this embodiment, determining the oxygen flow control value based on the oxygen mass to be added, the oxygen density to be added, the lower limit of the oxygen flow rate, and the target time period is specified as follows: obtaining the ratio of the oxygen mass to the oxygen density to obtain the oxygen volume to be added; obtaining the ratio of the oxygen volume to the target time period to obtain the average oxygen flow rate within the target time period; determining the average oxygen flow rate as the current upper limit of the oxygen flow rate, and determining the oxygen flow control value based on the current upper limit of the oxygen flow rate and the lower limit of the oxygen flow rate, wherein the oxygen flow control value does not exceed the current upper limit of the oxygen flow rate.

[0054] Furthermore, in this embodiment, the oxygenation of the boiler condensate side according to the oxygenation flow control value is specifically defined as: controlling the oxygenation flow regulating valve to adjust to the valve opening corresponding to the oxygenation flow control value, so as to oxygenate the boiler condensate side.

[0055] like Figure 2 As shown, the boiler condensate side oxygenation control method provided in this embodiment specifically includes the following steps:

[0056] S200: Obtain the current feedwater flow rate, oxygen density to be added, lower limit of oxygenation flow rate, target dissolved oxygen value and current dissolved oxygen value of the dissolved oxygen tracking point on the boiler condensate side.

[0057] S210. Compare the target dissolved oxygen value with the current dissolved oxygen value.

[0058] S220. When the current dissolved oxygen value is less than the target dissolved oxygen value, obtain the difference between the target dissolved oxygen value and the current dissolved oxygen value.

[0059] For example, the target dissolved oxygen value is denoted as Record the current dissolved oxygen value as The difference between the target dissolved oxygen value and the current dissolved oxygen value is recorded as... Then we have:

[0060] =

[0061] S230. Obtain the total amount of water flowing through the boiler condensate side within the target time period while keeping the current feedwater flow rate constant.

[0062] For example, the current water supply flow rate is recorded as Record the target time period as T The total amount of water flowing through the target time period is recorded as... Then we have:

[0063] T

[0064] S240. Obtain the product of the difference and the total water volume to get the mass of oxygen to be added.

[0065] For example, the mass of oxygen to be added is denoted as Then we have:

[0066]

[0067] S250. Obtain the ratio of the mass of oxygen to be added to the density of oxygen to be added, and thus obtain the volume of oxygen to be added.

[0068] For example, the density of oxygen to be added is denoted as ρ Record the volume of oxygen to be added as Then we have:

[0069]

[0070] S260. Obtain the ratio of the volume to be oxygenated to the target time period, and obtain the average oxygenation flow rate within the target time period.

[0071] For example, the average oxygenation flow rate during the target time period is denoted as... Then we have:

[0072] S270. The average oxygen flow rate is determined as the current upper limit of the oxygen flow rate, and the oxygen flow rate control value is determined based on the current upper limit of the oxygen flow rate and the lower limit of the oxygen flow rate, wherein the oxygen flow rate control value does not exceed the current upper limit of the oxygen flow rate.

[0073] S280: Adjust the oxygenation flow regulating valve to the valve opening corresponding to the oxygenation flow control value to oxygenate the boiler condensate side.

[0074] Among them, the oxygenation flow regulating valve is a valve that adjusts the oxygenation flow rate by receiving and executing oxygenation regulation commands sent by the control system when oxygenation is added to the condensate side of the boiler.

[0075] This invention acquires the current feedwater flow rate, oxygen demand density, lower limit of oxygenation flow rate, target dissolved oxygen value, and current dissolved oxygen value at a dissolved oxygen tracking point on the boiler condensate side. When the current dissolved oxygen value is less than the target dissolved oxygen value, the required oxygen mass for the target time period is determined, and the upper limit of the current oxygenation flow rate is then determined. Finally, based on the lower limit of the oxygenation flow rate and the upper limit of the current oxygenation flow rate, an oxygenation flow rate control value for oxygenation on the boiler condensate side is determined. This allows for oxygenation on the boiler condensate side based on the oxygenation flow rate control value, thereby achieving automatic and precise oxygenation by determining the oxygen demand based on the real-time feedwater flow rate on the boiler condensate side. This enables adaptive adjustment of the oxygenation amount when the feedwater flow rate changes, thus solving the problem of large fluctuations in oxygenation control caused by factors such as feedwater flow rate changes and oxygenation lag.

[0076] Example 3

[0077] Figure 3 This is a flowchart illustrating a boiler condensate-side oxygenation control method according to Embodiment 3 of the present invention, which is a further optimization based on Embodiment 2. Specifically, determining the oxygenation flow control value based on the current upper limit and lower limit of the oxygenation flow rate is as follows: comparing the lower limit of the oxygenation flow rate with the current upper limit; when the lower limit is less than or equal to the current upper limit, determining the oxygenation flow control value based on the lower limit and the current upper limit, wherein the oxygenation flow control value is greater than or equal to the lower limit and less than or equal to the upper limit; when the lower limit is greater than the current upper limit, determining the current upper limit as the oxygenation flow control value.

[0078] Furthermore, this embodiment is optimized by adding the following: when the current dissolved oxygen value is greater than or equal to the target dissolved oxygen value, a user-set upper limit value for dissolved oxygen is obtained, wherein the upper limit value for dissolved oxygen is greater than the target dissolved oxygen value; the current dissolved oxygen value is compared with the upper limit value for dissolved oxygen; when the current dissolved oxygen value is less than the upper limit value for dissolved oxygen, the lower limit value for oxygenation flow is determined as the oxygenation flow control value, wherein the lower limit value for oxygenation flow is greater than zero; when the current dissolved oxygen value is greater than or equal to the upper limit value for dissolved oxygen, oxygenation on the boiler condensate side is stopped.

[0079] like Figure 3 As shown, the boiler condensate side oxygenation control method provided in this embodiment specifically includes the following steps:

[0080] S301. Obtain the current feedwater flow rate, oxygen density to be added, lower limit of oxygenation flow rate, target dissolved oxygen value and current dissolved oxygen value of the dissolved oxygen tracking point on the boiler condensate side.

[0081] S302. Compare the target dissolved oxygen value with the current dissolved oxygen value. If the current dissolved oxygen value is less than the target dissolved oxygen value, proceed to step S303; otherwise, proceed to step S312.

[0082] S303. Obtain the difference between the target dissolved oxygen value and the current dissolved oxygen value.

[0083] S304. Obtain the total amount of water flowing through the boiler condensate side within the target time period while keeping the current feedwater flow rate constant.

[0084] S305. Obtain the product of the difference and the total water volume to get the mass of oxygen to be added.

[0085] S306. Obtain the ratio of the mass of oxygen to be added to the density of oxygen to be added, and thus obtain the volume of oxygen to be added.

[0086] S307. Obtain the ratio of the volume to be oxygenated to the target time period, and obtain the average oxygenation flow rate within the target time period.

[0087] S308. Set the average oxygenation flow rate as the current upper limit of the oxygenation flow rate.

[0088] S309. Compare the lower limit of oxygenation flow rate with the current upper limit of oxygenation flow rate; if the lower limit of oxygenation flow rate is less than or equal to the current upper limit of oxygenation flow rate, proceed to step S310; otherwise, proceed to step S311.

[0089] It is understandable that the lower limit of oxygenation flow rate is the minimum oxygenation flow rate value set by the user for adding oxygen to the boiler condensate side. This minimum oxygenation flow rate value can be a non-negative number greater than or equal to zero. When the lower limit of oxygenation flow rate is less than or equal to the current upper limit of oxygenation flow rate, any selected value within the closed interval formed by the lower limit of oxygenation flow rate and the current upper limit of oxygenation flow rate can be used as the oxygenation flow rate control value. However, when the user sets the lower limit of oxygenation flow rate to be greater than zero, and the difference between the current dissolved oxygen value and the target dissolved oxygen value is very small, the lower limit of oxygenation flow rate may be greater than the current upper limit of oxygenation flow rate. In this case, the current dissolved oxygen value is already close to the target dissolved oxygen value, indicating that there is no need to add a large amount of oxygen. Therefore, the smaller current upper limit of oxygenation flow rate can be selected as the oxygenation flow rate control value.

[0090] S310. Determine that the oxygenation flow control value is greater than or equal to the lower limit of the oxygenation flow and less than or equal to the upper limit of the oxygenation flow, and proceed to step S316.

[0091] It should be noted that when the lower limit of oxygenation flow rate is determined to be less than or equal to the current upper limit of oxygenation flow rate, the range of the oxygenation flow rate control value is determined to be the closed interval formed by the lower limit of oxygenation flow rate and the current upper limit of oxygenation flow rate. This application does not limit how the oxygenation flow rate control value is determined based on this closed interval.

[0092] Optionally, the average of the lower limit of oxygenation flow rate and the current upper limit of oxygenation flow rate can be used as the oxygenation flow rate control value.

[0093] Optionally, based on the monitoring of the oxygenation flow rate time curve, in order to reduce the fluctuation amplitude of the curve, a value that meets the conditions can be adaptively selected from the above closed interval as the oxygenation flow rate control value.

[0094] Optionally, within the target time period, the oxygenation flow control value can be a constant value or a set of values, so as to reduce the fluctuation of oxygenation control through adaptive fluctuation.

[0095] S311. Determine the current upper limit of oxygenation flow rate as the oxygenation flow rate control value, and proceed to step S316.

[0096] S312. Obtain the user-defined upper limit value of dissolved oxygen, wherein the upper limit value of dissolved oxygen is greater than the target dissolved oxygen value.

[0097] The upper limit of dissolved oxygen refers to the highest permissible dissolved oxygen value on the condensate side of the boiler.

[0098] Understandably, in boiler systems, excessively high dissolved oxygen levels in feedwater can accelerate metal corrosion, leading to damage to pipes and equipment, reduced service life, and potentially increased maintenance costs. Therefore, a threshold value needs to be set to ensure that the dissolved oxygen content in the feedwater is within a range that can minimize boiler pipe corrosion.

[0099] S313. Compare the current dissolved oxygen value with the upper limit of dissolved oxygen. If the current dissolved oxygen value is less than the upper limit of dissolved oxygen, proceed to step S314; otherwise, proceed to step S315.

[0100] S314. Determine the lower limit of oxygenation flow rate as the oxygenation flow rate control value, wherein the lower limit of oxygenation flow rate is greater than zero; proceed to step S316.

[0101] Understandably, the lower limit of the oxygenation flow rate is the minimum oxygenation flow rate value set by the user for oxygenating the boiler condensate side. By setting the lower limit of the oxygenation flow rate to be greater than zero, it can be ensured that when the current dissolved oxygen value is greater than or equal to the target dissolved oxygen value and less than the upper limit of dissolved oxygen, the oxygenation flow rate control value is not 0, but can be oxygenated at a smaller flow rate value, thereby avoiding excessive reduction in dissolved oxygen caused by immediately stopping oxygenation under this operating condition.

[0102] S315. Stop adding oxygen to the condensate side of the boiler.

[0103] S316. Adjust the oxygenation flow regulating valve to the valve opening corresponding to the oxygenation flow control value in order to oxygenate the boiler condensate side.

[0104] This invention acquires the current feedwater flow rate, oxygen demand density, lower limit of oxygenation flow rate, target dissolved oxygen value, and current dissolved oxygen value at a dissolved oxygen tracking point on the boiler condensate side. When the current dissolved oxygen value is less than the target dissolved oxygen value, the required oxygen mass for the target time period is determined, and the upper limit of the current oxygenation flow rate is then determined. Finally, based on the lower limit and upper limit of the current oxygenation flow rate, an oxygenation flow rate control value for oxygenation on the boiler condensate side is determined. This allows for oxygenation on the boiler condensate side based on the controlled flow rate, thus achieving automatic and precise oxygenation by determining the oxygen demand based on the real-time feedwater flow rate on the boiler condensate side. This enables adaptive adjustment of the oxygenation amount when the feedwater flow rate changes, thereby solving the problem of large fluctuations in oxygenation control caused by changes in feedwater flow rate and oxygenation lag. Furthermore, by setting the lower limit of the oxygenation flow rate to be greater than zero, it avoids the situation where oxygenation is immediately stopped when the current dissolved oxygen value is greater than or equal to the target dissolved oxygen value but less than the upper limit, which could lead to excessive reduction in dissolved oxygen.

[0105] Example 4

[0106] Figure 4 This is a schematic diagram of a boiler condensate side oxygenation control device provided in Embodiment 4 of the present invention. This embodiment is applicable to situations where the oxygen demand is determined based on the real-time feedwater flow rate on the boiler condensate side and oxygenation is performed automatically and accurately. This method can be executed by the boiler condensate side oxygenation equipment in this embodiment of the present invention.

[0107] like Figure 4 As shown, the boiler condensate side oxygenation control device provided in this embodiment includes: a first acquisition module 401, a first dissolved oxygen comparison module 402, a mass determination module 403, a first flow rate determination module 404, and a condensate oxygenation module 405, wherein:

[0108] The first acquisition module 401 is used to acquire the current feedwater flow rate, oxygen density to be added, lower limit of oxygen addition flow rate, target dissolved oxygen value and current dissolved oxygen value of the dissolved oxygen tracking point on the boiler condensate side.

[0109] The first dissolved oxygen comparison module 402 is used to compare the target dissolved oxygen value with the current dissolved oxygen value;

[0110] The quality determination module 403 is used to determine the oxygenation mass corresponding to the target time period based on the current water supply flow rate, the target dissolved oxygen value, and the current dissolved oxygen value when the current dissolved oxygen value is less than the target dissolved oxygen value.

[0111] The first flow rate determination module 404 is used to determine the oxygenation flow rate control value for oxygenating the boiler condensate side based on the oxygenation mass to be added, the oxygenation density to be added, the lower limit of the oxygenation flow rate, and the target time period.

[0112] The condensate oxygenation module 405 is used to oxygenate the condensate side of the boiler according to the oxygenation flow control value.

[0113] Based on the above embodiments, the quality determination module 403 includes:

[0114] A difference acquisition unit is used to acquire the difference between the target dissolved oxygen value and the current dissolved oxygen value;

[0115] A water volume acquisition unit is used to acquire the total water volume flowing through the boiler condensate side within the target time period while keeping the current water supply flow rate constant.

[0116] The quality acquisition unit is used to obtain the product of the difference and the total water volume to obtain the quality of oxygen to be added.

[0117] Based on the above embodiments, the first flow determination module 404 includes:

[0118] A volume acquisition unit is used to acquire the ratio of the mass of oxygen to be added to the density of oxygen to be added, and to obtain the volume of oxygen to be added;

[0119] The mean value determination unit is used to obtain the ratio of the volume to be oxygenated to the target time period, and to obtain the average oxygenation flow rate within the target time period;

[0120] An oxygenation control unit is configured to determine the average oxygenation flow rate as the current upper limit of the oxygenation flow rate, and to determine the oxygenation flow rate control value based on the current upper limit of the oxygenation flow rate and the lower limit of the oxygenation flow rate, wherein the oxygenation flow rate control value does not exceed the current upper limit of the oxygenation flow rate.

[0121] Based on the above embodiments, the oxygen supply control unit includes:

[0122] The flow rate comparison subunit is used to compare the lower limit of the oxygenation flow rate with the current upper limit of the oxygenation flow rate.

[0123] The first determining subunit is used to determine that the oxygen flow control value is greater than or equal to the oxygen flow lower limit and less than or equal to the oxygen flow upper limit when the oxygen flow lower limit is less than the current oxygen flow upper limit.

[0124] The second determining subunit is used to determine the current oxygen flow rate upper limit as the oxygen flow rate control value when the lower limit of the oxygen flow rate is greater than or equal to the current upper limit of the oxygen flow rate.

[0125] Based on the above embodiments, the boiler condensate side oxygenation control device further includes:

[0126] The second acquisition module is used to acquire a user-set upper limit value of dissolved oxygen when the current dissolved oxygen value is greater than or equal to the target dissolved oxygen value, wherein the upper limit value of dissolved oxygen is greater than the target dissolved oxygen value;

[0127] The second dissolved oxygen comparison module is used to compare the current dissolved oxygen value with the upper limit value of dissolved oxygen.

[0128] The second flow rate determination module is used to determine the lower limit of the oxygenation flow rate as the oxygenation flow rate control value when the current dissolved oxygen value is less than the upper limit of dissolved oxygen value, wherein the lower limit of the oxygenation flow rate is greater than zero;

[0129] The oxygenation stop module is used to stop oxygenation on the boiler condensate side when the current dissolved oxygen value is greater than or equal to the upper limit of dissolved oxygen.

[0130] Based on the above embodiments, the condensate oxygenation module 405 includes:

[0131] The valve control unit is used to control the oxygenation flow regulating valve to adjust the valve opening to the value corresponding to the oxygenation flow control value, so as to oxygenate the condensate side of the boiler.

[0132] The boiler condensate side oxygenation control device provided in this embodiment of the invention can execute the boiler condensate side oxygenation control method provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the method.

[0133] Example 5

[0134] Figure 5 This is a schematic diagram of the structure of a boiler condensate side oxygenation device provided in Embodiment 5 of the present invention, as shown below. Figure 5 As shown, the device includes: a processor 50, a memory 51, an input device 52, and an output device 53; the number of processors 50 in the boiler condensate side oxygenation device can be one or more. Figure 5 Taking a processor 50 as an example; the processor 50, memory 51, input device 52, and output device 53 in the boiler condensate side oxygenation equipment can be connected via a bus or other means. Figure 5 Taking the example of a connection between China and Israel via a bus.

[0135] The memory 51, as a computer-readable storage medium, can be used to store software programs, computer-executable programs, and modules, such as the program instructions / modules corresponding to the boiler condensate-side oxygenation control method in this embodiment of the invention (e.g., the first acquisition module 401, the first dissolved oxygen comparison module 402, the quality determination module 403, the first flow rate determination module 404, and the condensate oxygenation module 405 in the boiler condensate-side oxygenation control device). The processor 50 executes various functional applications and data processing of the boiler condensate-side oxygenation equipment by running the software programs, instructions, and modules stored in the memory 51, thereby realizing the aforementioned boiler condensate-side oxygenation control method.

[0136] The memory 51 may primarily include a program storage area and a data storage area. The program storage area may store the operating system and at least one application program required for a given function; the data storage area may store data created based on terminal usage. Furthermore, the memory 51 may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory, or other non-volatile solid-state storage device. In some instances, the memory 51 may further include memory remotely located relative to the processor 50, which can be connected to the device / terminal / server via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0137] Input device 52 can be used to receive input digital or character information, and to generate key signal inputs related to user settings and function control of the device / terminal / server. Output device 53 may include display devices such as a display screen.

[0138] The boiler condensate side oxygenation device provided in this embodiment of the invention can execute the boiler condensate side oxygenation control method provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the method.

[0139] Example 6

[0140] Embodiment 6 of the present invention also provides a storage medium containing computer-executable instructions, which, when executed by a computer processor, are used to perform a boiler condensate-side oxygenation control method, the method comprising:

[0141] Obtain the current feedwater flow rate, oxygen density to be added, lower limit of oxygen addition flow rate, target dissolved oxygen value and current dissolved oxygen value at the dissolved oxygen tracking point on the boiler condensate side;

[0142] Compare the target dissolved oxygen value with the current dissolved oxygen value;

[0143] When the current dissolved oxygen value is less than the target dissolved oxygen value, the oxygenation mass to be added for the target time period is determined based on the current water supply flow rate, the target dissolved oxygen value, and the current dissolved oxygen value.

[0144] The oxygenation flow control value for oxygenating the boiler condensate side is determined based on the oxygenation mass to be added, the oxygenation density to be added, the lower limit of the oxygenation flow rate, and the target time period.

[0145] Oxygen is added to the condensate side of the boiler according to the oxygen flow control value.

[0146] Of course, the computer-executable instructions provided in the embodiments of the present invention are not limited to the method operations described above, but can also perform related operations in the boiler condensate side oxygenation control method provided in any embodiment of the present invention.

[0147] Based on the above description of the implementation methods, those skilled in the art can clearly understand that the present invention can be implemented using software and necessary general-purpose hardware, and of course, it can also be implemented using hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk, or optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0148] It is worth noting that in the embodiments of the above-mentioned boiler condensate side oxygenation control device, the various units and modules included are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be achieved; in addition, the specific names of each functional unit are only for easy differentiation and are not used to limit the scope of protection of the present invention.

[0149] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A method for controlling oxygenation on the condensate side of a boiler, characterized in that, include: Obtain the current feedwater flow rate, oxygen density to be added, lower limit of oxygen addition flow rate, target dissolved oxygen value and current dissolved oxygen value at the dissolved oxygen tracking point on the boiler condensate side; When the current dissolved oxygen value is less than the target dissolved oxygen value, the oxygenation mass to be added for the target time period is determined based on the current water supply flow rate, the target dissolved oxygen value, and the current dissolved oxygen value. The oxygenation flow control value for oxygenating the boiler condensate side is determined based on the oxygenation mass to be added, the oxygenation density to be added, the lower limit of the oxygenation flow rate, and the target time period. Oxygen is added to the condensate side of the boiler according to the oxygenation flow control value; The step of determining the oxygenation flow control value based on the mass of oxygen to be added, the density of oxygen to be added, the lower limit of the oxygenation flow rate, and the target time period includes: The ratio of the mass of oxygen to be added to the density of oxygen to be added is obtained to obtain the volume of oxygen to be added; The ratio of the volume to be oxygenated to the target time period is obtained to obtain the average oxygenation flow rate within the target time period; The average oxygen flow rate is determined as the current upper limit of the oxygen flow rate, and the oxygen flow rate control value is determined based on the current upper limit of the oxygen flow rate and the lower limit of the oxygen flow rate, wherein the oxygen flow rate control value does not exceed the current upper limit of the oxygen flow rate; The oxygenation flow control value is determined based on the current upper limit of the oxygenation flow rate and the lower limit of the oxygenation flow rate, including: Compare the lower limit of the oxygenation flow rate with the current upper limit of the oxygenation flow rate; When the lower limit of the oxygenation flow rate is less than or equal to the current upper limit of the oxygenation flow rate, the oxygenation flow rate control value is determined to be greater than or equal to the lower limit of the oxygenation flow rate and less than or equal to the upper limit of the oxygenation flow rate. When the lower limit of the oxygenation flow rate is greater than the upper limit of the current oxygenation flow rate, the upper limit of the current oxygenation flow rate is determined as the oxygenation flow rate control value.

2. The boiler condensate side oxygenation control method according to claim 1, characterized in that, The step of determining the oxygenation mass to be added for the target time period based on the current water supply flow rate, the target dissolved oxygen value, and the current dissolved oxygen value includes: Obtain the difference between the target dissolved oxygen value and the current dissolved oxygen value; Obtain the total amount of water flowing through the boiler condensate side within the target time period while keeping the current feedwater flow rate constant. The mass of oxygen to be added is obtained by multiplying the difference by the total water volume.

3. The boiler condensate side oxygenation control method according to claim 1, characterized in that, Also includes: When the current dissolved oxygen value is greater than or equal to the target dissolved oxygen value, the user-set upper limit value of dissolved oxygen is obtained, wherein the upper limit value of dissolved oxygen is greater than the target dissolved oxygen value; Compare the current dissolved oxygen value with the upper limit of dissolved oxygen; When the current dissolved oxygen value is less than the upper limit of dissolved oxygen, the lower limit of oxygenation flow rate is determined as the oxygenation flow rate control value, wherein the lower limit of oxygenation flow rate is greater than zero; When the current dissolved oxygen value is greater than or equal to the upper limit of dissolved oxygen, oxygenation on the condensate side of the boiler is stopped.

4. The boiler condensate side oxygenation control method according to any one of claims 1-3, characterized in that, The step of adding oxygen to the boiler condensate side according to the oxygenation flow control value includes: The oxygenation flow regulating valve is adjusted to the valve opening corresponding to the oxygenation flow control value in order to oxygenate the condensate side of the boiler.

5. A boiler condensate side oxygenation control device, characterized in that, The method for controlling oxygenation on the condensate side of a boiler as described in any one of claims 1-3 includes: The first acquisition module is used to acquire the current feedwater flow rate, oxygen density to be added, lower limit of oxygen addition flow rate, target dissolved oxygen value and current dissolved oxygen value of dissolved oxygen tracking point on the boiler condensate side. The first dissolved oxygen comparison module is used to compare the target dissolved oxygen value with the current dissolved oxygen value; The quality determination module is used to determine the oxygenation mass corresponding to the target time period based on the current water supply flow rate, the target dissolved oxygen value, and the current dissolved oxygen value when the current dissolved oxygen value is less than the target dissolved oxygen value. The first flow rate determination module is used to determine the oxygenation flow rate control value for oxygenating the condensate side of the boiler based on the oxygenation mass to be added, the oxygenation density to be added, the lower limit of the oxygenation flow rate, and the target time period. The condensate oxygenation module is used to oxygenate the condensate side of the boiler according to the oxygenation flow control value.

6. A boiler condensate-side oxygenation device, characterized in that, include: One or more processors; Storage device for storing one or more programs; The one or more programs are executed by the one or more processors, causing the one or more processors to implement the boiler condensate side oxygenation control method as described in any one of claims 1-3.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the boiler condensate side oxygenation control method as described in any one of claims 1-3.

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