A method and system for desulfurization emission control

Abstract

The application discloses a desulfurization emission control method, which comprises the following steps: collecting parameter information, calculating total sulfur content of a system, calculating the amount of absorbent slurry spraying according to the liquid-gas ratio, and recommending the power arrangement combination of the slurry circulating pump. Through the use of the system, the operation mode of changing from three pumps to two pumps is successfully realized under the condition of low sulfur content entering a furnace, and the scheduling of the slurry circulating pump is more accurate under the condition of high sulfur content entering the furnace, so that the inaccuracy caused by inconsistent experience of personnel is reduced.

Description

Technical Field

[0001] This invention relates to the field of wet gypsum desulfurization technology, and in particular to a method and system for desulfurization emission control. Background Technology

[0002] With increasingly stringent environmental protection requirements and rising energy costs, desulfurization emission control technology has become a critical issue that thermal power plants must address. Currently, most thermal power plants control their desulfurization systems by manually adjusting operating parameters, but this method is inefficient, difficult to operate, and prone to errors.

[0003] To address this issue, intelligent control technology has emerged. By integrating various sensors, control algorithms, real-time monitoring, and data analysis technologies, intelligent control systems can automatically adjust desulfurization operating parameters, further reducing the overall system's power consumption and thus achieving energy conservation and emission reduction.

[0004] Furthermore, intelligent control systems can improve production efficiency, reduce equipment failure rates and maintenance costs, while also improving product quality, enabling manufacturers to better adapt to market competition. Therefore, intelligent control technology not only offers significant economic benefits but also meets environmental protection requirements, effectively promoting the sustainable development of thermal power plants. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] In view of the aforementioned existing problems, the present invention is proposed.

[0007] Therefore, the present invention provides a method for desulfurization emission control, which can solve the problems of high cost of traditional activated carbon and difficulty in recovering and utilizing the adsorbed sulfides, resulting in resource waste.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for desulfurization emission control, comprising:

[0009] The total sulfur content of the system is calculated by collecting parameter information;

[0010] Calculate the amount of absorbent slurry sprayed based on the liquid-to-gas ratio;

[0011] Recommendations are made based on the power arrangement of the slurry circulation pumps.

[0012] As a preferred embodiment of the desulfurization emission control method of the present invention, the parameter information includes: confirming the coal type of the shift according to the coal list on the coal fed into the furnace, and entering relevant parameters according to the coal feeding time. The relevant parameters include the power consumption of the slurry circulation pump, the desulfurization effect, and the sulfur content of the coal fed into the furnace.

[0013] When the holographic recording of the coal entering the furnace is completed, the system compares the pre-set empirical parameters with the actual operating parameters to determine whether the slurry circulation pump combination is the optimal combination.

[0014] In a preferred embodiment of the desulfurization emission control method described in this invention, the total sulfur content entering the system is calculated based on the unit load and the sulfur content of the coal fed into the furnace.

[0015] ,

[0016] in, The total sulfur content is w, and the unit load is w. denoted as , where is the sulfur content of the coal fed into the furnace, and is the type of coal

[0017] As a preferred embodiment of the desulfurization emission control method of the present invention, the amount of absorbent slurry sprayed includes,

[0018] ,

[0019] in, The liquid-to-gas ratio, This refers to the amount of absorbent slurry sprayed.

[0020] In a preferred embodiment of the desulfurization emission control method described in this invention, the recommendation based on the power arrangement of the slurry circulation pumps includes the following: In actual construction, when two slurry circulation pumps with different power are present on site, if the flow coefficient corresponding to the high-power slurry circulation pump is greater than the flow coefficient per unit power corresponding to the low-power slurry circulation pump, and the flow rate required by the low-power slurry circulation pump to satisfy the total sulfur content is greater than or equal to the flow rate required by the high-power slurry circulation pump to satisfy the total sulfur content, then, since the flow coefficient per unit power gradually increases with the increase of pump power,

[0021] ,

[0022] in, This refers to the power of a low-power slurry circulation pump. The power of a high-power slurry circulation pump, The flow coefficient of a low-power slurry circulation pump. The flow coefficient of a high-power slurry circulation pump;

[0023] The optimal combination is a combination of one low-power slurry circulation pump and one high-power slurry circulation pump.

[0024] ,

[0025] Therefore, the optimal combination is to select two high-power slurry circulation pumps.

[0026] As a preferred embodiment of the desulfurization emission control method of the present invention, the determination of whether the slurry circulation pump combination is the optimal combination includes: if the deviation exceeds the preset tolerance range, the system will automatically issue an alarm; when the system issues an alarm, the system's built-in optimization algorithm calculates the parameters that can achieve the optimal desulfurization effect and energy consumption under the current conditions; on-site personnel adjust the parameters to remove the alarm; the system will continue to monitor the operating parameters; if the fluctuation is stable within the recommended value range, the system will operate normally; if the adjusted parameters exceed the recommended range, the parameter values ​​will be iteratively optimized and repeatedly adjusted until the recommended parameter values ​​enter the tolerance range.

[0027] Another objective of this invention is to provide a system for desulfurization emission control, which automatically adjusts operating parameters through intelligent control algorithms to maximize equipment utilization and improve desulfurization efficiency. The intelligent control system can analyze and process real-time and historical data to find the optimal combination of operating parameters, reduce operating costs, and improve production efficiency.

[0028] A system for desulfurization emission control, characterized in that it includes: a data acquisition module, a control algorithm module, a human-machine interface module, and a data storage and analysis module;

[0029] The data acquisition module is used to monitor and acquire key parameters and transmit the data to the control system;

[0030] The control algorithm module performs intelligent control based on the parameters provided by the data acquisition module and the preset desulfurization process parameters, automatically adjusting the feeding amount, spray liquid amount, and discharge valve opening operation parameters.

[0031] The human-computer interaction interface module provides a visual interface, allowing operators to intuitively understand the operating status of the entire system.

[0032] The data storage and analysis module is used to store historical data and analyze and process the data to provide a basis for decision-making.

[0033] A computer device includes a memory and a processor, the memory storing a computer program, characterized in that the processor executes the computer program to implement the steps of a method for desulfurization emission control.

[0034] A computer-readable storage medium having a computer program stored thereon, characterized in that, when the computer program is executed by a processor, it implements the steps of a method for desulfurization emission control.

[0035] The beneficial effects of this invention are as follows: By using this system, a two-pump operation mode was successfully achieved when the sulfur content at the furnace feed was low; when the sulfur content at the furnace feed was high, the scheduling of the slurry circulation pumps became more precise, reducing inaccurate adjustments due to inconsistent personnel experience. Throughout the entire operation, the power consumption of one slurry circulation pump can be reduced on average. Based on a single 1400KW slurry circulation pump, this translates to a saving of 0.14% of the plant's power consumption rate. Considering the total annual power generation of the Sutong Power Plant in 2022 was approximately 11 billion kWh, this equates to 15.4 million kWh of electricity. Based on a coal consumption rate of 290 grams per kWh, this represents a saving of 4466 tons of standard coal, thus improving economic efficiency. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0037] Figure 1 This is a schematic flowchart of a desulfurization emission control method according to an embodiment of the present invention;

[0038] Figure 2 The effect of liquid-to-gas ratio on desulfurization effect in a desulfurization emission control method provided in one embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of a system flow diagram of a desulfurization emission control method provided in one embodiment of the present invention. Detailed Implementation

[0040] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail 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 should fall within the protection scope of the present invention.

[0041] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0042] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0043] This invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of this invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of this invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0044] Furthermore, in the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In addition, the terms "first," "second," or "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" in this invention should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; similarly, they can refer to mechanical connections, electrical connections, or direct connections, or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] Example 1

[0047] Reference Figure 1-2 This is the first embodiment of the present invention, which provides a method for controlling desulfurization emissions, comprising:

[0048] S1: Calculate the total sulfur content of the system by collecting parameter information;

[0049] It should be noted that the parameter information includes confirming the coal type for this shift based on the coal list on the coal fed into the furnace, and entering relevant parameters based on the coal feeding time. The relevant parameters include the power consumption of the slurry circulation pump, the desulfurization effect, and the sulfur content of the coal fed into the furnace.

[0050] When the holographic recording of the coal entering the furnace is completed, the system compares the pre-set empirical parameters with the actual operating parameters to determine whether the slurry circulation pump combination is the optimal combination.

[0051] Furthermore, the total sulfur content entering the system is calculated based on the unit load and the sulfur content of the coal fed into the furnace.

[0052] ,

[0053] in, The total sulfur content is w, and the unit load is w. denoted as , where is the sulfur content of the coal fed into the furnace, and is the type of coal

[0054] S2: Calculate the amount of absorbent slurry sprayed based on the liquid-to-gas ratio;

[0055] It should be noted that the amount of absorbent slurry sprayed includes,

[0056] ,

[0057] in, The liquid-to-gas ratio, This refers to the amount of absorbent slurry sprayed.

[0058] Furthermore, the liquid-to-gas ratio is proportional to the desulfurization rate and has a value of 6.5~7.5 L / m3.

[0059] It should be noted that, as Figure 2 As shown in the figure, the liquid-to-gas ratio is a crucial parameter for the design and operation of a spray system. This parameter significantly impacts the overall desulfurization efficiency and operating costs of the system. The figure below illustrates the effect of the liquid-to-gas ratio on the desulfurization effect. As the figure shows, with the increase of the liquid-to-gas ratio, the outlet SO2 concentration decreases, and the desulfurization efficiency increases accordingly. When the liquid-to-gas ratio increases from 4.0 L / m³ to 7.5 L / m³, the outlet SO2 concentration decreases from 439 × 10⁻⁶ mg / m³ to 89 × 10⁻⁶ mg / m³, a decrease of approximately 80%. Under the same nozzle atomization performance, within a certain range, a higher liquid-to-gas ratio results in a larger gas-liquid contact area, leading to greater absorption of gaseous components per unit time. However, when the liquid-to-gas ratio exceeds 7.0 L / m³, its effect on desulfurization efficiency becomes insignificant. This may be because after the slurry volume reaches a certain value, droplet coagulation intensifies, and the effective specific surface area no longer increases. Therefore, the liquid-to-gas ratio is directly proportional to the desulfurization efficiency and should ideally be between 6.5 and 7.5 L / m³.

[0060] S3: Recommendations are made based on the power arrangement of the slurry circulation pumps.

[0061] The recommendation based on the power arrangement of the slurry circulation pumps includes the following: In actual construction, when there are two slurry circulation pumps with different power ratings on site, if the flow coefficient corresponding to the high-power slurry circulation pump is greater than the flow coefficient per unit power corresponding to the low-power slurry circulation pump, and the flow rate required by the low-power slurry circulation pump to meet the total sulfur content is greater than or equal to the flow rate required by the high-power slurry circulation pump to meet the total sulfur content, then, since the flow coefficient per unit power gradually increases with the increase of pump power,

[0062] ,

[0063] in, This refers to the power of a low-power slurry circulation pump. The power of a high-power slurry circulation pump, The flow coefficient of a low-power slurry circulation pump. The flow coefficient of a high-power slurry circulation pump;

[0064] The optimal combination is a combination of one low-power slurry circulation pump and one high-power slurry circulation pump.

[0065] ,

[0066] Therefore, the optimal combination is to select two high-power slurry circulation pumps.

[0067] The determination of whether the slurry circulation pump combination is the optimal combination includes: if the deviation exceeds the preset tolerance range, the system will automatically issue an alarm. When the system issues an alarm, the system's built-in optimization algorithm calculates the parameters that can achieve the best desulfurization effect and energy consumption under the current conditions. On-site personnel can remove the alarm by adjusting the parameters. The system will continue to monitor the operating parameters. If the fluctuation is stable within the recommended value range, the system will operate normally. If the adjusted parameters exceed the recommended range, the parameter values ​​will be repeatedly adjusted through iterative optimization until the recommended parameter values ​​enter the tolerance range.

[0068] Example 2

[0069] As one embodiment of the present invention, a method for desulfurization emission control is provided. To verify the beneficial effects of the present invention, scientific demonstration is carried out through experiments.

[0070] The approach to optimizing data acquisition for desulfurization slurry circulation pumps is as follows: Under different unit loads and sulfur content of the coal fed into the furnace, by using different combinations of slurry circulation pumps (considering the output reduction of slurry circulation pumps after long-term operation, the flow uniformity of different pump combinations, and reasonable pH values, etc.), the total energy consumption of the slurry circulation pumps is minimized while ensuring that SO2 at the outlet of the absorption tower meets the ultra-clean emission requirements.

[0071] After the average sulfur content of the coal fed into the furnace is input, it is multiplied by the total coal quantity of the unit to obtain the total sulfur content (t / h). When the actual calculated sulfur content falls within a certain range, an alarm is issued to remind the operators to adjust the slurry circulation pump combination according to the recommended values.

[0072] After practical verification, the following problems were found: 1) Recently, an efficiency enhancer was added to the absorber, resulting in a change in desulfurization efficiency compared to the past. 2) After a long period of operation, cavitation wear of the absorber slurry circulation pumps altered the efficiency of each pump. 3) Recently, the desulfurization system has been affected by the performance of desulfurization wastewater discharge, resulting in a high chloride ion concentration, which also has a certain impact on the absorber efficiency. After correcting the above problems, Table 1 is the recommended table for sulfur content optimization at Plant S.

[0073] Table 1 Recommended Optimization Table for Slurry Circulation Pumps at Sutong Power Plant

[0074]

[0075] Table 2

[0076]

[0077] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

[0078] Example 3

[0079] refer to Figure 3 This is the third embodiment of the present invention. This embodiment provides a system for a desulfurization emission control method, including: a data acquisition module, a control algorithm module, a human-machine interface module, and a data storage and analysis module.

[0080] The data acquisition module is used to monitor and collect various key parameters, such as flue gas flow rate, sulfur dioxide concentration, and pH value, and transmit the data to the control system.

[0081] The control algorithm module: This module performs intelligent control based on the various parameters provided by the data acquisition module and the preset desulfurization process parameters, and automatically adjusts the operating parameters such as the feed rate, spray liquid volume, and discharge valve opening.

[0082] The human-machine interface module provides a visual interface that allows operators to intuitively understand the overall system's operating status, desulfurization efficiency, waste gas treatment efficiency, equipment malfunctions, and other information. It also provides an alarm function to promptly notify operators in case of abnormal situations.

[0083] The data storage and analysis module is used to store historical data and analyze and process it to provide a basis for decision-making. For example, it analyzes historical data to determine desulfurization efficiency and exhaust gas emission concentration under different conditions, which can be used to adjust production plans and equipment operation modes.

[0084] Example 4

[0085] The fourth embodiment of the present invention differs from the first three embodiments in that:

[0086] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, essentially, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0087] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-including system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0088] More specific examples of computer-readable media (a non-exhaustive list) include: electrical connections (electronic devices) having one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0089] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

Claims

1. A method for controlling desulfurization emissions, characterized in that: include, The total sulfur content of the system is calculated by collecting parameter information; Calculate the amount of absorbent slurry sprayed based on the liquid-to-gas ratio; Recommendations are made based on the power arrangement of the slurry circulation pumps; The parameter information includes confirming the coal type for this shift based on the coal list on the coal fed into the furnace, and entering relevant parameters based on the coal feeding time. The relevant parameters include the power consumption of the slurry circulation pump, the desulfurization effect, and the sulfur content of the coal fed into the furnace. When the holographic recording of the coal entering the furnace is completed, the system compares the pre-set empirical parameters with the actual operating parameters to determine whether the slurry circulation pump combination is the optimal combination. The total sulfur content entering the system is calculated based on the unit load and the sulfur content of the coal fed into the furnace. ， in, The total sulfur content is w, and the unit load is w. The sulfur content of the coal fed into the furnace is represented by 'i', where 'i' represents the type of coal. The amount of absorbent slurry sprayed includes... ， in, The liquid-to-gas ratio, This refers to the amount of absorbent slurry sprayed. The recommendation based on the power arrangement of the slurry circulation pumps includes the following: In actual construction, when there are two slurry circulation pumps with different power ratings on site, if the flow coefficient corresponding to the high-power slurry circulation pump is greater than the flow coefficient per unit power corresponding to the low-power slurry circulation pump, and the flow rate required by the low-power slurry circulation pump to meet the total sulfur content is greater than or equal to the flow rate required by the high-power slurry circulation pump to meet the total sulfur content, then, since the flow coefficient per unit power gradually increases with the increase of pump power, ， in, This refers to the power of a low-power slurry circulation pump. The power of a high-power slurry circulation pump, The flow coefficient of a low-power slurry circulation pump. The flow coefficient of a high-power slurry circulation pump; The optimal combination is a combination of one low-power slurry circulation pump and one high-power slurry circulation pump. ， Therefore, the optimal combination is to select two high-power slurry circulation pumps.

2. The method for desulfurization emission control as described in claim 1, characterized in that: The liquid-to-gas ratio is proportional to the desulfurization efficiency and has a value of 6.5~7.5 L / m3.

3. The method for desulfurization emission control as described in claim 2, characterized in that: The determination of whether the slurry circulation pump combination is the optimal combination includes: if the deviation exceeds the preset tolerance range, the system will automatically issue an alarm. When the system issues an alarm, the system's built-in optimization algorithm calculates the parameters that can achieve the best desulfurization effect and energy consumption under the current conditions. On-site personnel can remove the alarm by adjusting the parameters. The system will continue to monitor the operating parameters. If the fluctuation is stable within the recommended value range, the system will operate normally. If the adjusted parameters exceed the recommended range, the parameter values ​​will be repeatedly adjusted through iterative optimization until the recommended parameter values ​​enter the tolerance range.

4. A system employing a desulfurization emission control method as described in any one of claims 1 to 3, characterized in that: It includes a data acquisition module, a control algorithm module, a human-computer interaction interface module, and a data storage and analysis module; The data acquisition module is used to monitor and acquire key parameters and transmit the data to the control system; The control algorithm module performs intelligent control based on the parameters provided by the data acquisition module and the preset desulfurization process parameters, automatically adjusting the feeding amount, spray liquid amount, and discharge valve opening operation parameters. The human-computer interaction interface module provides a visual interface, allowing operators to intuitively understand the operating status of the entire system. The data storage and analysis module is used to store historical data and analyze and process the data to provide a basis for decision-making.

5. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 3.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 3.

Images