A method and system for deep peak shaving of a w-flame boiler adapted to multiple coal types

Abstract

The application discloses a kind of W flame boiler deep peak shaving method and system suitable for multiple coal kinds.The method of the application comprises: obtaining the received base volatile matter of each coal kind of W flame boiler and the target load of boiler;According to the target load of W flame boiler, the target weighted average flue gas temperature of each burner outlet of target coal kind of coal mill in operation is obtained;The speed of each coal feeder of coal mill in operation is adjusted, and the coal quantity of each coal feeder of coal mill in operation is adjusted according to the target coal quantity of each coal kind of coal mill in operation, so that the received base volatile matter of coal kind of coal mill in operation reaches the target received base volatile matter of coal kind;The opening degree of pulverized coal pipe adjusting door of each burner of coal mill in operation is adjusted, and the coal quantity of each burner of coal mill in operation is adjusted according to the target coal quantity of each burner of coal mill in operation, so that the weighted average flue gas temperature of each burner outlet of coal mill in operation reaches the target weighted average flue gas temperature.The application can expand the peak shaving range of W flame boiler while improving the adaptability of coal kind.

Description

Technical Field

[0001] This invention belongs to the field of power plant boiler technology, specifically a deep peak shaving method and system for W-flame boilers adapted to multiple coal types. Background Technology

[0002] With the continuous development of new power systems, the installed capacity and grid-connected capacity of renewable energy power generation such as wind power, hydropower, and photovoltaic power have seen large-scale development. However, the intermittency and uncertainty of their grid-connected power generation have negatively impacted the safe and stable operation of the power grid. To improve the absorption capacity of renewable energy, thermal power units, which handle the vast majority of the country's power generation, must undertake the peak-shaving task of the power grid. The expected flexibility retrofitting of thermal power plants will enable pure condensing units to achieve a minimum technical output of 30%-50% of their rated capacity. This requires improving the deep peak-shaving capacity of these units through equipment upgrades, operational optimization, and other aspects.

[0003] In my country, W-flame boilers are commonly used to burn low-volatile, high-ash, and low-calorific-value coal. Due to the use of low-volatile coal, W-flame boilers typically exhibit poor low-load stable combustion performance, limiting their deep peak-shaving capabilities. Completely converting W-flame boilers to use high-volatile coal could lead to various problems such as tube wall overheating and steam temperature deviations due to a significant deviation from the designed coal type.

[0004] Therefore, researching a method that can both utilize existing low-volatile coal types and improve the deep peak-shaving capacity of boilers is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a deep peak shaving method and system for W-flame boilers that are adaptable to multiple coal types. Taking the W-flame boiler of a power plant as the research object, by adjusting the coal quantity of each coal feeder of the operating coal mill and the coal quantity of each burner, the peak shaving range of the W-flame boiler can be expanded while improving the adaptability to different coal types.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a deep peak-shaving method for W-flame boilers adapted to multiple coal types, taking a W-flame combustion boiler in a power plant as the research object, the method comprising:

[0007] Obtain the received volatile matter content of each type of coal fed into the W-flame boiler and the target boiler load;

[0008] Based on the target load of the W-flame boiler, obtain the target coal type received volatile matter and the target weighted average flue gas temperature at the outlet of each burner of the coal mill in operation;

[0009] Calculate the target coal quantity of each coal type for the coal mill to be put into operation based on the target coal quantity, the received basis volatile matter of the target coal type, and the received basis volatile matter of each coal type fed into the furnace.

[0010] Adjust the speed of each coal feeder of the coal mill in operation, and adjust the coal feed of each coal feeder of the coal mill in operation according to the target coal type and coal quantity of the coal mill in operation, so that the received basis volatile matter of the coal type in the coal mill in operation reaches the target coal type received basis volatile matter.

[0011] Obtain the flue gas temperature at the outlet of each burner of the coal mill in operation;

[0012] Calculate the target coal quantity for each burner of the coal mill to be put into operation based on the target coal quantity for the coal mill to be put into operation, the target weighted average flue gas temperature at the outlet of each burner, and the flue gas temperature at the outlet of each burner.

[0013] Adjust the opening of the pulverized coal pipe regulating valve of each burner of the coal mill in operation, and adjust the coal quantity of each burner of the coal mill in operation according to the target coal quantity of each burner, so that the weighted average flue gas temperature at the outlet of each burner of the coal mill in operation reaches the target weighted average flue gas temperature at the outlet of each burner of the coal mill in operation.

[0014] Furthermore, the received volatile matter content of the target coal type for the coal mill to be put into operation is determined based on the target load of the W-flame boiler. If 40% of the rated load of the W-flame boiler ≤ the target load of the W-flame boiler ≤ 50% of the rated load of the W-flame boiler, the received volatile matter content V of the target coal type for the coal mill to be put into operation is determined. r0 ≥V r1 If the rated load of the 30% W-flame boiler is less than or equal to the target load of the W-flame boiler, and the rated load of the 40% W-flame boiler is less than or equal to the rated load of the 40% W-flame boiler, the target coal type received by the volatile matter V of the coal mill should be used. r0 ≥V r2 Among them, V r1 This indicates the first received volatile component, which is the preset value; V r2 This indicates the second received volatile component, which is a preset value.

[0015] Furthermore, the target weighted average flue gas temperature at the outlet of each burner of the coal mill in operation is determined based on the target load of the W-flame boiler. If 40% of the rated load of the W-flame boiler ≤ the target load of the W-flame boiler ≤ 50% of the rated load of the W-flame boiler, the target weighted average flue gas temperature at the outlet of each burner of the coal mill in operation is t0 ≥ t1; if 30% of the rated load of the W-flame boiler ≤ the target load of the W-flame boiler < 40% of the rated load of the W-flame boiler, the target weighted average flue gas temperature at the outlet of each burner of the coal mill in operation is t0 ≥ t2; where t1 represents the average flue gas temperature at the outlet of each burner of the first coal mill in operation, which is a preset value; t2 represents the average flue gas temperature at the outlet of each burner of the second coal mill in operation, which is a preset value.

[0016] Furthermore, the formula for calculating the target coal quantity of the nth coal mill in operation is: A n =A0×α n ,∑α n =1; where A0 is the total amount of coal fed into the furnace, α nLet be the coal quantity allocation coefficient for the nth coal mill in operation.

[0017] Furthermore, based on the target load of the W-flame boiler, the target coal input quantities for each type of coal in the nth operating coal mill satisfy the following relationship: ∑B nm =A n , Among them, B nm V represents the target coal quantity of the m-th type of coal fed into the n-th coal mill, where m is the quantity of the coal type being fed into the mill; nrm The volatile matter content received by the m-th coal type fed into the n-th coal mill is V. nr0 The volatile matter content of the target coal type was received for the nth coal mill put into operation.

[0018] Furthermore, based on the target load of the W-flame boiler, the target coal quantity in each pulverized coal pipe of the nth operating coal mill satisfies the following relationship: ∑C np =A n , Among them, C p The target coal quantity for the p-th burner of the nth coal mill in operation is given by t, where p is the number of burners. np Let t be the flue gas temperature at the outlet of the p-th burner of the nth coal mill in operation. n0 The weighted average flue gas temperature at the outlet of each burner of the nth coal mill put into operation.

[0019] Another technical solution adopted in this invention is: a deep peak-shaving system for a W-flame boiler adapted to multiple coal types, the system comprising:

[0020] First acquisition unit: Acquire the received volatile matter content of each type of coal fed into the W-flame boiler and the target boiler load;

[0021] The second acquisition unit: Based on the target load of the W-flame boiler, acquire the target coal type received volatile matter and the target weighted average flue gas temperature at the outlet of each burner of the coal mill in operation;

[0022] First calculation unit: Calculate the target coal quantity of each coal type to be fed into the coal mill based on the target coal quantity, the received basis volatile matter of the target coal type, and the received basis volatile matter of each coal type fed into the furnace.

[0023] First adjustment unit: Adjust the speed of each coal feeder of the coal mill in operation, and adjust the coal feed of each coal feeder of the coal mill in operation according to the target coal type and coal quantity of each coal type entering the furnace, so that the received volatile matter of the coal type in the coal mill in operation reaches the target coal type received volatile matter.

[0024] Third acquisition unit: Acquire the flue gas temperature at the outlet of each burner of the coal mill in operation;

[0025] The second calculation unit calculates the target coal quantity of each burner of the coal mill to be put into operation based on the target coal quantity, the target weighted average flue gas temperature at the outlet, and the flue gas temperature at the outlet of each burner.

[0026] The second regulating unit adjusts the opening of the pulverized coal pipe regulating valve of each burner of the coal mill in operation, and adjusts the coal quantity of each burner of the coal mill in operation according to the target coal quantity of each burner, so that the weighted average flue gas temperature at the outlet of each burner of the coal mill in operation reaches the target weighted average flue gas temperature at the outlet of each burner of the coal mill in operation.

[0027] This invention takes a W-flame boiler in a power plant as the research object. By adjusting the coal feeder and the coal feeder of each burner in the operating coal mill, the weighted average volatile matter content of the coal and the weighted average flue gas temperature at the outlet of each burner in the operating coal mill can reach the target volatile matter content and target weighted average flue gas temperature under the target load of the boiler. No equipment modification is required. Through operation optimization, the peak-shaving range of the W-flame boiler can be expanded while improving the adaptability of coal types. Attached Figure Description

[0028] Figure 1 A flowchart of a deep peak-shaving method for a W-flame boiler adapted to multiple coal types is shown in a specific embodiment of the present invention.

[0029] Figure 2 This is a structural diagram of a deep peak-shaving system for a W-flame boiler adapted to multiple coal types, according to a specific embodiment of the present invention. Detailed Implementation

[0030] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, so as to make the technical solutions of the present invention easier to understand and master. It should be understood that the specific embodiments described herein are only used to explain a part of the embodiments of the invention, and not all of the embodiments. Other embodiments obtained by those skilled in the art without creative effort are all within the scope of protection of the present invention.

[0031] Example 1

[0032] This embodiment provides a deep peak-shaving method for W-flame boilers adaptable to multiple coal types. Taking domestic W-flame boilers as the research object, by adjusting the coal feeder of each coal mill and the coal feeder of each burner, the weighted average volatile matter content of the coal type in the operating coal mill and the weighted average flue gas temperature at the outlet of each burner in the operating coal mill reach the target volatile matter content and target weighted average flue gas temperature under the target load of the boiler. This can expand the peak-shaving range of W-flame boilers while improving coal type adaptability.

[0033] Please see the appendix Figure 1 A deep peak-shaving method for W-flame boilers adaptable to multiple coal types includes the following specific steps:

[0034] Step 1: Obtain the received volatile matter content and target load of each type of coal fed into the W-flame boiler;

[0035] Step 2: Based on the target load of the W-flame boiler, obtain the target coal type received volatile matter and the target weighted average flue gas temperature at the outlet of each burner of the coal mill in operation;

[0036] Step 3: Calculate the target coal quantity for each type of coal to be fed into the coal mill based on the target coal quantity, the received volatile matter of the target coal type, and the received volatile matter of each type of coal fed into the furnace.

[0037] Step 4: Adjust the speed of each feeder of the coal mill in operation, and adjust the coal feed of each feeder of the coal mill in operation according to the target coal type and coal quantity of each coal type entering the furnace, so that the received volatile matter of the coal type in the coal mill in operation reaches the target coal type received volatile matter.

[0038] Step 5: Obtain the flue gas temperature at the outlet of each burner of the coal mill in operation;

[0039] Step 6: Calculate the target coal quantity for each burner of the coal mill to be put into operation based on the target coal quantity for the coal mill to be put into operation, the target weighted average flue gas temperature at the outlet of each burner, and the flue gas temperature at the outlet of each burner.

[0040] Step 7: Adjust the opening of the pulverized coal pipe regulating valve of each burner of the coal mill in operation. Adjust the coal quantity of each burner of the coal mill in operation according to the target coal quantity of each burner in operation, so that the weighted average flue gas temperature at the outlet of each burner of the coal mill in operation reaches the target weighted average flue gas temperature at the outlet of each burner of the coal mill in operation.

[0041] The target coal type's received volatile matter content (VLCP) for the coal mill put into operation is determined based on the target load of the W-flame boiler. If 40% of the W-flame boiler's rated load ≤ the target load of the W-flame boiler ≤ 50% of the rated load of the W-flame boiler, the VLCP of the target coal type for the coal mill put into operation is... r0 ≥V r1 If the rated load of the 30% W-flame boiler is less than or equal to the target load of the W-flame boiler, and the rated load of the 40% W-flame boiler is less than or equal to the rated load of the 40% W-flame boiler, the target coal type received by the volatile matter V of the coal mill should be used. r0 ≥V r2 Among them, V r1 This indicates the first received volatile component, which is the preset value; V r2 This indicates the second received volatile component, which is a preset value.

[0042] The target weighted average flue gas temperature at the outlet of each burner of the coal mill is determined based on the target load of the W-flame boiler. If 40% of the rated load of the W-flame boiler ≤ the target load of the W-flame boiler ≤ 50% of the rated load of the W-flame boiler, the target weighted average flue gas temperature at the outlet of each burner of the coal mill is t0 ≥ t1; if 30% of the rated load of the W-flame boiler ≤ the target load of the W-flame boiler < 40% of the rated load of the W-flame boiler, the target weighted average flue gas temperature at the outlet of each burner of the coal mill is t0 ≥ t2. Wherein, t1 represents the first average flue gas temperature at the outlet of each burner of the coal mill, which is a preset value; t2 represents the second average flue gas temperature at the outlet of each burner of the coal mill, which is a preset value.

[0043] The formula for calculating the target coal quantity of the nth coal mill in operation is: A n =A0×α n ,∑α n =1; where A0 is the total amount of coal fed into the furnace, α n Let be the coal quantity allocation coefficient for the nth coal mill in operation.

[0044] Based on the target load of the W-flame boiler, the target coal input quantities for each type of coal in the nth operating coal mill satisfy the following relationship: ∑B nm =A n , Among them, B nm V represents the target coal quantity of the m-th type of coal fed into the n-th coal mill, where m is the quantity of the coal type being fed into the mill; nrm The volatile matter content of the m-th type of coal fed into the n-th coal mill is obtained.

[0045] Based on the target load of the W-flame boiler, the target coal quantity in each pulverized coal tube of the nth operating coal mill satisfies the following relationship: ∑C np =A n , Among them, C np The target coal quantity for the p-th burner of the nth coal mill in operation is given by t, where p is the number of burners. np Let t be the flue gas temperature at the outlet of the p-th burner of the nth coal mill in operation. n0 The weighted average flue gas temperature at the outlet of each burner of the nth coal mill put into operation.

[0046] The following example is the No. 1 boiler of a power plant. This boiler is a DG1114 / 18.5-II15 type subcritical pressure single intermediate reheat natural circulation boiler produced by Dongfang Boiler Factory. It is equipped with a double-inlet double-outlet coal mill positive pressure direct-fired pulverizing system, a concentrated double swirl burner, and two three-compartment LUNK air preheaters installed under the vertical flue at the tail of the boiler. The boiler is designed for anthracite coal.

[0047] The coal type and coal quality analysis of a certain high volatile coal type used in the boiler design are shown in Table 1.

[0048] Table 1. Analysis of Coal Quality of Commonly Used Boilers

[0049] project symbol unit Design coal type A certain type of high volatile coal Received basic carbon <![CDATA[C ar ]]> ％ 57.12 58.60 Received basic hydrogen <![CDATA[H ar ]]> ％ 2.51 3.36 Received basic oxygen <![CDATA[O ar ]]> ％ 2.23 7.28 Received basic nitrogen <![CDATA[N ar ]]> ％ 0.91 0.79 Received basic sulfur <![CDATA[S ar ]]> ％ 3.19 0.63 Received base moisture <![CDATA[M ar ]]> ％ 9.00 9.61 Received base ash <![CDATA[A ar ]]> ％ 25.04 19.77 Received base volatiles <![CDATA[V ar ]]> ％ 8.45 22.82 Received low-grade heat of heat <![CDATA[Q net,ar ]]> kJ / kg 21960 22441

[0050] Because the designed coal type has a low volatile matter content (only 8.45%), it is not conducive to deep peak-shaving operation of the boiler. Therefore, it is necessary to blend high-volatile matter coal types to facilitate stable combustion. Generally, if the boiler requires deep peak-shaving operation, the volatile matter content (VPC) of the coal type used in the operating pulverizer must be controlled above 14%, and the maximum blending ratio of the two coal types mentioned above is 1.59:1. Different boilers require different volatile matter content (VPC) of the coal type used in the operating pulverizer under different loads. The lower the load, the higher the required VPC content. The first and second VPC contents are the minimum VPC contents (VPC) for different load ranges and are preset values.

[0051] Under the premise that the coal blending ratio of the coal mills is determined, during deep peak shaving operation, the weighted average flue gas temperature at the outlet of each burner of the coal mill must be maintained above the minimum stable combustion flue gas temperature. At this point, the flue gas temperature at the outlet of each burner of the coal mill should be obtained. Based on this, if the flue gas temperature at the outlet of some burners of the coal mill is lower than the required weighted average flue gas temperature, the corresponding pulverized coal feed rate should be reduced until the weighted average flue gas temperature at the outlet of each burner reaches the target weighted average flue gas temperature. The first and second average flue gas temperatures at the outlets of each burner of the coal mill are the minimum stable combustion flue gas temperatures for different load segments, and are preset values.

[0052] Example 2

[0053] This embodiment describes a deep peak-shaving system for a W-flame boiler adapted to multiple coal types. Taking a W-flame boiler in a power plant as the research object, the system includes:

[0054] First acquisition unit: Acquire the received volatile matter content of each type of coal fed into the W-flame boiler and the target boiler load;

[0055] The second acquisition unit: Based on the target load of the W-flame boiler, acquire the target coal type received volatile matter and the target weighted average flue gas temperature at the outlet of each burner of the coal mill in operation;

[0056] First calculation unit: Calculate the target coal quantity of each coal type to be fed into the coal mill based on the target coal quantity, the received basis volatile matter of the target coal type, and the received basis volatile matter of each coal type fed into the furnace.

[0057] First adjustment unit: Adjust the speed of each coal feeder of the coal mill in operation, and adjust the coal feed of each coal feeder of the coal mill in operation according to the target coal type and coal quantity of each coal type entering the furnace, so that the received volatile matter of the coal type in the coal mill in operation reaches the target coal type received volatile matter.

[0058] Third acquisition unit: Acquire the flue gas temperature at the outlet of each burner of the coal mill in operation;

[0059] The second calculation unit calculates the target coal quantity of each burner of the coal mill to be put into operation based on the target coal quantity, the target weighted average flue gas temperature at the outlet, and the flue gas temperature at the outlet of each burner.

[0060] The second regulating unit adjusts the opening of the pulverized coal pipe regulating valve of each burner of the coal mill in operation, and adjusts the coal quantity of each burner of the coal mill in operation according to the target coal quantity of each burner, so that the weighted average flue gas temperature at the outlet of each burner of the coal mill in operation reaches the target weighted average flue gas temperature at the outlet of each burner of the coal mill in operation.

[0061] In the second acquisition unit, the received volatile matter content of the target coal type in the coal mill is determined based on the target load of the W-flame boiler. If 40% of the rated load of the W-flame boiler ≤ the target load of the W-flame boiler ≤ 50% of the rated load of the W-flame boiler, the received volatile matter content V of the target coal type in the coal mill is determined. r0 ≥V r1 If the rated load of the 30% W-flame boiler is less than or equal to the target load of the W-flame boiler, and the rated load of the 40% W-flame boiler is less than or equal to the rated load of the 40% W-flame boiler, the target coal type received by the volatile matter V of the coal mill should be used. r0 ≥V r2 Among them, V r1 Indicates the first received volatile component, V r2 This indicates that the second batch of volatile components was received.

[0062] In the second acquisition unit, the target weighted average flue gas temperature at the outlet of each burner of the coal mill in operation is determined based on the target load of the W-flame boiler. If 40% of the rated load of the W-flame boiler ≤ the target load of the W-flame boiler ≤ 50% of the rated load of the W-flame boiler, the target weighted average flue gas temperature at the outlet of each burner of the coal mill in operation is t0 ≥ t1; if 30% of the rated load of the W-flame boiler ≤ the target load of the W-flame boiler < 40% of the rated load of the W-flame boiler, the target weighted average flue gas temperature at the outlet of each burner of the coal mill in operation is t0 ≥ t2; where t1 represents the first average flue gas temperature at the outlet of each burner of the coal mill in operation, and t2 represents the second average flue gas temperature at the outlet of each burner of the coal mill in operation.

[0063] In the aforementioned calculation unit, the target coal quantity A of the nth coal mill put into operation is... n The calculation formula is: A n =A0×α n ,∑α n =1; where A0 is the total amount of coal fed into the furnace, α n Let n be the coal quantity allocation coefficient for the nth coal mill in operation.

[0064] Based on the target load of the W-flame boiler, the target coal input quantities for each type of coal in the nth operating coal mill satisfy the following relationship: ∑B nm =A n , Among them, B nm V represents the target coal quantity of the m-th type of coal fed into the n-th coal mill, where m is the quantity of the coal type being fed into the mill; nrm The volatile matter content of the m-th type of coal fed into the n-th coal mill is obtained.

[0065] In the aforementioned regulating unit, based on the target load of the W-flame boiler, the target coal quantity of each pulverized coal pipe in the nth operating coal mill satisfies the following relationship: ∑C np =A n , Among them, C np The target coal quantity for the p-th burner of the nth coal mill in operation is given by t, where p is the number of burners. np Let t be the flue gas temperature at the outlet of the p-th burner of the nth coal mill in operation. n0 The weighted average flue gas temperature at the outlet of each burner of the nth coal mill put into operation.

[0066] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein.

Claims

1. A deep peak-shaving method for W-flame boilers adapted to multiple coal types, characterized in that, Taking the W-flame boiler in a power plant as the research object, this method includes: Obtain the received volatile matter content of each type of coal fed into the W-flame boiler and the target boiler load; Based on the target load of the W-flame boiler, obtain the target coal type received volatile matter and the target weighted average flue gas temperature at the outlet of each burner of the coal mill in operation; Calculate the target coal quantity of each coal type for the coal mill to be put into operation based on the target coal quantity, the received basis volatile matter of the target coal type, and the received basis volatile matter of each coal type fed into the furnace. Adjust the speed of each coal feeder of the coal mill in operation, and adjust the coal feed of each coal feeder of the coal mill in operation according to the target coal type and coal quantity of the coal mill in operation, so that the received basis volatile matter of the coal type in the coal mill in operation reaches the target coal type received basis volatile matter. Obtain the flue gas temperature at the outlet of each burner of the coal mill in operation; Calculate the target coal quantity for each burner of the coal mill to be put into operation based on the target coal quantity for the coal mill to be put into operation, the target weighted average flue gas temperature at the outlet of each burner, and the flue gas temperature at the outlet of each burner. Adjust the opening of the pulverized coal pipe regulating valve of each burner of the coal mill in operation, and adjust the coal quantity of each burner of the coal mill in operation according to the target coal quantity of each burner, so that the weighted average flue gas temperature at the outlet of each burner of the coal mill in operation reaches the target weighted average flue gas temperature at the outlet of each burner of the coal mill in operation.

2. The deep peak-shaving method for a W-flame boiler adaptable to multiple coal types according to claim 1, characterized in that, The target coal type received volatile matter content of the pulverizer is determined based on the target load of the W-flame boiler. If 40% of the rated load of the W-flame boiler ≤ the target load of the W-flame boiler ≤ 50% of the rated load of the W-flame boiler, the received volatile matter content V of the target coal type of the pulverizer is determined. r0 ≥V r1 If the rated load of the 30% W-flame boiler is less than or equal to the target load of the W-flame boiler, and the rated load of the 40% W-flame boiler is less than or equal to the rated load of the 40% W-flame boiler, the target coal type received by the volatile matter V of the coal mill should be used. r0 ≥V r2 ; Among them, V r1 This indicates the first received volatile component, which is the preset value; V r2 This indicates the second received volatile component, which is a preset value.

3. The deep peak-shaving method for a W-flame boiler adaptable to multiple coal types according to claim 1, characterized in that, The target weighted average flue gas temperature at the outlet of each burner of the coal mill in operation is determined based on the target load of the W-flame boiler. If 40% of the rated load of the W-flame boiler ≤ the target load of the W-flame boiler ≤ 50% of the rated load of the W-flame boiler, the target weighted average flue gas temperature at the outlet of each burner of the coal mill in operation is t0 ≥ t1; if 30% of the rated load of the W-flame boiler ≤ the target load of the W-flame boiler < 40% of the rated load of the W-flame boiler, the target weighted average flue gas temperature at the outlet of each burner of the coal mill in operation is t0 ≥ t2; where t1 represents the first average flue gas temperature at the outlet of each burner of the coal mill in operation, which is a preset value; t2 represents the second average flue gas temperature at the outlet of each burner of the coal mill in operation, which is a preset value.

4. The deep peak-shaving method for a W-flame boiler adaptable to multiple coal types according to claim 1, characterized in that, The target coal quantity of the nth coal mill in operation is A. n The calculation formula is: A n =A0×α n ,∑α n =1; where A0 is the total amount of coal fed into the furnace, α n Let be the coal quantity allocation coefficient for the nth coal mill in operation.

5. A deep peak-shaving method for a W-flame boiler adaptable to multiple coal types according to claim 1, characterized in that, Based on the target load of the W-flame boiler, the target coal input quantities for each type of coal in the nth operating coal mill satisfy the following relationship: ∑B nm =A n , Among them, B nm V represents the target coal quantity of the m-th type of coal fed into the n-th coal mill, where m is the quantity of the coal type being fed into the mill; nrm For the m-th type of coal fed into the n-th operating coal mill, the volatile matter content A is... n V represents the target coal quantity for the nth coal mill to be put into operation. nr0 The volatile matter content of the target coal type was received for the nth coal mill put into operation.

6. The deep peak-shaving method for a W-flame boiler adaptable to multiple coal types according to claim 1, characterized in that, Based on the target load of the W-flame boiler, the target coal quantity for each burner of the nth operating coal mill satisfies the following relationship: ∑C np =A n , Among them, C np The target coal quantity for the p-th burner of the nth coal mill in operation is given by t, where p is the number of burners. np Let t be the flue gas temperature at the outlet of the p-th burner of the nth coal mill in operation. n0 The weighted average flue gas temperature at the outlet of each burner of the nth coal mill put into operation.

7. A deep peak-shaving system for a W-flame boiler adaptable to multiple coal types, characterized in that, Taking the W-flame boiler in a power plant as the research object, the system includes: First acquisition unit: Acquire the received volatile matter content of each type of coal fed into the W-flame boiler and the target boiler load; The second acquisition unit: Based on the target load of the W-flame boiler, acquire the target coal type received volatile matter and the target weighted average flue gas temperature at the outlet of each burner of the coal mill in operation; First calculation unit: Calculate the target coal quantity of each coal type to be fed into the coal mill based on the target coal quantity, the received basis volatile matter of the target coal type, and the received basis volatile matter of each coal type fed into the furnace. First adjustment unit: Adjust the speed of each coal feeder of the coal mill in operation, and adjust the coal feed of each coal feeder of the coal mill in operation according to the target coal type and coal quantity of each coal type entering the furnace, so that the received volatile matter of the coal type in the coal mill in operation reaches the target coal type received volatile matter. Third acquisition unit: Acquire the flue gas temperature at the outlet of each burner of the coal mill in operation; The second calculation unit calculates the target coal quantity of each burner of the coal mill to be put into operation based on the target coal quantity, the target weighted average flue gas temperature at the outlet, and the flue gas temperature at the outlet of each burner. The second regulating unit adjusts the opening of the pulverized coal pipe regulating valve of each burner of the coal mill in operation, and adjusts the coal quantity of each burner of the coal mill in operation according to the target coal quantity of each burner, so that the weighted average flue gas temperature at the outlet of each burner of the coal mill in operation reaches the target weighted average flue gas temperature at the outlet of each burner of the coal mill in operation.

8. A deep peak-shaving system for a W-flame boiler adapted to multiple coal types according to claim 7, characterized in that, In the second acquisition unit, the received volatile matter content of the target coal type in the coal mill is determined based on the target load of the W-flame boiler. If 40% of the rated load of the W-flame boiler ≤ the target load of the W-flame boiler ≤ 50% of the rated load of the W-flame boiler, the received volatile matter content V of the target coal type in the coal mill is determined. r0 ≥V r1 If the rated load of the 30% W-flame boiler is less than or equal to the target load of the W-flame boiler, and the rated load of the 40% W-flame boiler is less than or equal to the rated load of the 40% W-flame boiler, the target coal type received by the volatile matter V of the coal mill should be used. r0 ≥V r2 ; Among them, V r1 This indicates the first received volatile component, which is the preset value; V r2 This indicates the second received volatile component, which is a preset value.

9. A deep peak-shaving system for a W-flame boiler adapted to multiple coal types according to claim 7, characterized in that, In the second acquisition unit, the target weighted average flue gas temperature at the outlet of each burner of the coal mill in operation is determined based on the target load of the W-flame boiler. If 40% of the rated load of the W-flame boiler ≤ the target load of the W-flame boiler ≤ 50% of the rated load of the W-flame boiler, the target weighted average flue gas temperature at the outlet of each burner of the coal mill in operation is t0 ≥ t1; if 30% of the rated load of the W-flame boiler ≤ the target load of the W-flame boiler < 40% of the rated load of the W-flame boiler, the target weighted average flue gas temperature at the outlet of each burner of the coal mill in operation is t0 ≥ t2; where t1 represents the first average flue gas temperature at the outlet of each burner of the coal mill in operation, which is a preset value; t2 represents the second average flue gas temperature at the outlet of each burner of the coal mill in operation, which is a preset value.

10. A deep peak-shaving system for a W-flame boiler adapted to multiple coal types according to claim 7, characterized in that, In the calculation unit, the target coal quantity A of the nth coal mill in operation is... n The calculation formula is: A n =A0×α n ,∑α n =1; where A0 is the total amount of coal fed into the furnace, α n Let n be the coal quantity allocation coefficient for the nth coal mill in operation. Based on the target load of the W-flame boiler, the target coal input quantities for each type of coal in the nth operating coal mill satisfy the following relationship: ∑B nm =A n , Among them, B nm V represents the target coal quantity of the m-th type of coal fed into the n-th coal mill, where m is the quantity of the coal type being fed into the mill; nrm For the m-th type of coal fed into the n-th operating coal mill, the volatile matter content A is... n V represents the target coal quantity for the nth coal mill to be put into operation. nr0 The volatile matter content of the target coal type received for the nth coal mill put into operation; Based on the target load of the W-flame boiler, the target coal quantity for each burner of the nth operating coal mill satisfies the following relationship: ∑C np =A n , Among them, C np The target coal quantity for the p-th burner of the nth coal mill in operation is given by t, where p is the number of burners. np Let t be the flue gas temperature at the outlet of the p-th burner of the nth coal mill in operation. n0 The weighted average flue gas temperature at the outlet of each burner of the nth coal mill put into operation.

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