Method and system for adjusting steam temperature and smoke temperature deviation of octagonal double-tangent-circle boiler

Abstract

The invention provides a method and a system for adjusting steam temperature and smoke temperature deviation of an octagonal double tangent circle boiler. The method comprises the following steps: acquiring primary air speed relative deviation of a coal mill in a primary air speed preliminary test; adjusting an adjustable shrinkage cavity in the powder pipe on the basis of a comparison result between the relative deviation of the primary air speed and a preset deviation range; until the primary air speed relative deviation of all the powder pipes in the coal mills is within the deviation range, the primary air speed relative deviation of any coal mill combination is obtained, and the coal mill combination needing to be adjusted is determined based on the primary air speed relative deviation; on the basis of comparison between the absolute value of the sum of the primary air speed relative deviations of the coal mill combination needing to be adjusted and a preset threshold value, the corresponding adjustable shrinkage cavities are adjusted; and when the absolute value of the sum of the relative deviations of the primary wind speeds of the tangent circles of the coal mills is smaller than the preset threshold value, current operation parameters of the unit are obtained, the current operation parameters are compared with historical operation parameters of the unit for verification, and the optimal coal mill combination is determined.

Description

Technical Field

[0001] The invention belongs to the technical field of optimization and adjustment of power station boilers, and in particular to a method and system for adjusting the deviation of steam temperature and smoke temperature of an octagonal double-tangential circle boiler. Background Art

[0002] With the continuous advancement of power plant boiler technology and changes in market demand, large-capacity, high-parameter units have become the mainstream trend, among which the number of million-kilowatt units put into operation is increasing day by day. Against this background, the optimization and improvement of the combustion system is particularly important; among the many combustion methods, the octagonal double-tangential circle combustion method occupies a considerable proportion of the million-kilowatt units due to its unique advantages.

[0003] Compared with the traditional four-corner single-tangential circle combustion method, the octagonal double-tangential circle combustion method shows better performance, and its single burner has a smaller heat load, which means that under the same boiler capacity, the heat load pressure on each burner is effectively dispersed, thereby improving the stability and efficiency of combustion. At the same time, the setting of the octagonal reverse double-tangential circle further enhances the disturbance of the flue gas in the furnace, allowing the flue gas to be more evenly distributed, effectively reducing and weakening the deviation of the left and right sides of the flue gas at the furnace outlet.

[0004] However, although the octagonal double-tangential circle combustion method has many advantages, it still faces some challenges during actual operation, especially the residual rotation of the flue gas at the furnace outlet, which often leads to deviations in flue gas temperature and steam temperature, and then causes overheating of the heating surface tube wall. This phenomenon will not only affect the normal operation of the unit, but may also have a serious impact on the safety and economy of the unit. The methods commonly adopted in the industry include conducting cold power field tests, adjusting the secondary air distribution and the upper and lower swing angles and horizontal swing angles of the burnout air, etc. These measures can reduce the steam temperature and flue gas temperature deviation of the octagonal double-tangential circle boiler to a certain extent, but due to the particularity of the furnace space of the million-unit unit, the adjustment effect is not always significant. Summary of the invention

[0005] In order to solve the problem that the existing method of adjusting the upper and lower swing angles and the horizontal swing angles of the secondary air distribution and the burnout air can reduce the steam temperature and smoke temperature deviation of the octagonal double tangential circle boiler with poor effect, the present invention provides a method and system for adjusting the steam temperature and smoke temperature deviation of the octagonal double tangential circle boiler. Under different coal mill combinations, it is considered to reduce the total heat load deviation of the two tangential circles in the furnace, thereby achieving the purpose of reducing the deviation of the boiler steam temperature and smoke temperature, and improving the safety and economy of the boiler operation.

[0006] To achieve the above object, the present invention provides the following technical solutions: The present invention proposes a method for adjusting the deviation of steam temperature and smoke temperature of an octagonal double tangential circle boiler, comprising the following steps: S1. Conduct a wind speed test on the coal mill under hot powder conditions to obtain the relative deviation of the wind speed of the powder pipe in the coal mill. ; S2, based on the relative deviation of the primary wind speed Comparing the result with a preset deviation range, adjusting the adjustable shrinkage hole on the powder hose corresponding to the relative deviation value exceeding the deviation range; S3, repeat S1~S2 until the relative deviation of the primary wind speed of all powder pipes in all coal mills is If all are within the deviation range, stop repeating S1~S2 and proceed to S4; S4, arbitrarily combine the coal mills adjusted in S3 to obtain a coal mill combination, and obtain the relative deviation of the primary wind speed of the coal mill combination , based on the relative deviation of the primary wind speed The calculated sum of the relative deviations of the primary wind speed of the mill group determines the coal mill combination that needs to be adjusted; S5, based on the comparison result between the absolute value of the sum of the relative deviations of the primary wind speeds of the grinding group of the coal mill combination that needs to be adjusted and a preset threshold, adjusting the adjustable shrinkage hole in the corresponding coal mill combination; S6, repeat S4-S5 until the absolute value of the sum of the relative deviations of the wind speeds of all coal mill groups is less than the preset threshold, stop repeating S4-S5, and proceed to S7; S7. Obtain the current operating parameters of the unit under all the coal mill combinations, compare and verify the current operating parameters of the unit with the historical operating parameters of the unit before the coal mill adjustment, and determine the optimal coal mill combination.

[0007] Preferably, in S1, a wind speed test is performed on the coal mill under hot powder-carrying conditions, including: Control the coal mill to reach the rated working conditions and obtain the primary wind speed value of each powder pipe at the coal mill outlet ; Based on the primary wind speed value Calculate the average wind speed of each powder hose ; Based on the primary wind speed value and the average wind speed Calculate the relative deviation of the primary wind speed at the coal mill outlet .

[0008] Preferably, based on the primary wind speed value and the average wind speed Calculate the relative deviation of the primary wind speed at the coal mill outlet The calculation process is:

[0009] in, For coal mill export i Relative deviation of primary wind speed of No. powder hose; For coal mill export i The primary wind speed of the powder hose; It is the average value of the primary air velocity at the outlet powder pipe of the coal mill.

[0010] Preferably, in S2, based on the primary wind speed relative deviation Compare with preset deviation ranges, including: Set the deviation range; The primary wind speed relative deviation Compare with the stated deviation range; If the relative deviation of the primary wind speed If the deviation exceeds the above range, the relative deviation of the primary wind speed is adjusted. Corresponding to the adjustable shrinkage hole on the outlet powder pipe of the coal mill; If the relative deviation of the primary wind speed If the deviation does not exceed the deviation range, the relative deviation of the primary wind speed will not be adjusted. Corresponding to the adjustable shrinkage hole on the outlet powder pipe of the coal mill.

[0011] Preferably, the deviation range is -10% to +10%.

[0012] Preferably, in S4, based on the relative deviation of the primary wind speed The sum of the relative deviations of the primary wind speed of the grinding group is calculated, including: Obtaining all the relative deviations of the primary wind speed on the left tangent circle of a single coal mill in the coal mill combination ; Based on the relative deviation of all the primary wind speeds on the left tangent circle in the coal mill Calculate the sum of the relative deviations of the left-tangential circle primary wind speed corresponding to the coal mill ; Based on the sum of the relative deviations of the primary wind speed of the left tangent circle corresponding to the coal mill The sum of the relative deviations of the primary wind speed of the left tangential circle of the coal mill combination is calculated. ; Obtaining all the relative deviations of the primary wind speed on the right tangent circle of a single coal mill in the coal mill combination ; Based on the relative deviation of all the primary wind speeds on the right tangent circle in the coal mill Calculate the sum of the relative deviations of the primary wind speed of the right tangent circle corresponding to the coal mill ; Based on the sum of the relative deviations of the primary wind speed of the right tangent circle corresponding to the coal mill The sum of the relative deviations of the primary wind speed of the right tangential circle of the coal mill combination is calculated. ; The sum of the relative deviations of the primary wind speed of the right tangent circle of the grinding group is sorted out. and the sum of the relative deviation of the primary wind speed of the left tangent circle of the grinding group , get the sum of relative deviations of primary wind speed of the grinding group; The coal mill combination that needs to be adjusted is determined based on the sum of the relative deviations of the primary wind speeds of the grinding groups.

[0013] Preferably, the method of determining the coal mill combination that needs to be adjusted based on the sum of the relative deviations of the primary wind speeds of the grinding mill groups includes: Preset judgment value; The sum of the relative deviations of the primary wind speed of the right tangent circle of the grinding group and the sum of the relative deviation of the primary wind speed of the left tangent circle of the grinding group Take the absolute value to get the sum of the relative deviations of the primary wind speed of the right tangent circle of the grinding group. The absolute value of and the relative deviation of the primary wind speed of the left tangent circle of the grinding group The absolute value of The sum of the relative deviations of the wind speed of the right tangent circle of the grinding group The absolute value of and the relative deviation of the primary wind speed of the left tangent circle of the grinding group The absolute values ​​of are compared with the preset judgment values ​​respectively; If the sum of the relative deviations of the primary wind speed of the right tangent circle of the grinding group If the absolute value of is greater than the preset judgment value, the sum of the relative deviations of the primary wind speed of the right tangent circle of the grinding group is determined. The coal mill combination corresponding to the absolute value of needs to be adjusted; if the sum of the relative deviations of the primary wind speed of the right tangent circle of the grinding group If the absolute value of is less than the preset judgment value, the sum of the relative deviations of the primary wind speed of the right tangent circle of the grinding group is determined. The coal mill combination corresponding to the absolute value of does not need to be adjusted; If the sum of the relative deviations of the primary wind speed of the left tangent circle of the grinding group If the absolute value of is greater than the preset judgment value, the sum of the relative deviations of the primary wind speed of the left tangential circle of the grinding group is determined. The coal mill combination corresponding to the absolute value of needs to be adjusted; if the sum of the relative deviations of the left tangential circle wind speed of the grinding group If the absolute value of is less than the preset judgment value, the sum of the relative deviations of the primary wind speed of the left tangential circle of the grinding group is determined. The coal mill combination corresponding to the absolute value does not need to be adjusted.

[0014] Preferably, the step S5 is based on comparing the absolute value of the sum of the relative deviations of the primary wind speeds of the coal mill combination to be adjusted with a preset threshold, and includes: The absolute values ​​of the sums of the relative deviations of the primary wind speeds of the coal mill groups that need to be adjusted are compared with the preset threshold values ​​respectively; If the absolute value of the sum of the relative deviations of the primary wind speed of the coal mill combination to be adjusted is greater than the preset threshold, the sum of the relative deviations of the primary wind speed of all the tangential circles in the coal mill group corresponding to the sum of the relative deviations of the primary wind speed of the coal mill group is calculated. The absolute value of the wind speed of the cutting circle is compared, and the sum of the relative deviations of the wind speed of the cutting circle is selected. The maximum value among the absolute values ​​of is adjusted to correspond to the adjustable shrinkage hole of the powder pipe on the coal mill.

[0015] Preferably, the preset threshold is 10%~15%.

[0016] The present invention proposes a steam temperature and smoke temperature deviation adjustment system for an octagonal double tangential circle boiler, which is used to implement the above method, and includes: The first processing unit is configured to: perform a wind speed test on the coal mill under hot powder-carrying conditions to obtain a relative deviation of the wind speed of the powder pipe in the coal mill. ; The second processing unit is configured to: Comparing the result with a preset deviation range, adjusting the adjustable shrinkage hole on the powder hose corresponding to the relative deviation value exceeding the deviation range; The third processing unit is configured to: arbitrarily combine the coal mills adjusted by S3 to obtain a coal mill combination, and obtain a relative deviation of the primary wind speed of the coal mill combination , based on the relative deviation of the primary wind speed The calculated sum of the relative deviations of the primary wind speed of the mill group determines the coal mill combination that needs to be adjusted; The fourth processing unit is configured to adjust the adjustable shrinkage hole in the corresponding coal mill combination based on the comparison result between the absolute value of the sum of the relative deviations of the primary wind speed of the coal mill combination to be adjusted and the preset threshold value; The fifth processing unit is configured to: obtain current operating parameters of the unit under all coal mill combinations, compare and verify the current operating parameters of the unit with historical operating parameters of the unit before the coal mill adjustment, and determine the optimal coal mill combination; The sixth processing unit is configured to output an optimal coal mill combination.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention proposes a method for adjusting the deviation of steam temperature and smoke temperature of an octagonal double-tangential circle boiler. The method can accurately obtain the relative deviation of the primary wind speed of each powder pipe by conducting a preliminary test on the primary wind speed of the coal mill under the hot powder-carrying condition, and then make a detailed adjustment on the deviation of the primary wind speed with powder at the outlet of the coal mill, thereby ensuring the pertinence and accuracy of the adjustment. Based on the comparison result of the relative deviation of the primary wind speed with a preset deviation range, the adjustable shrinkage hole of the powder pipe that exceeds the range is adjusted until the relative deviation of the primary wind speed of all powder pipes meets the requirements, thereby effectively balancing the wind speed of each powder pipe. The speed provides a strong guarantee for the stable combustion of the boiler. By calculating the sum of the relative deviations of the primary wind speed of the grinding group, the coal mill combination that needs to be adjusted is determined. For different coal mill combinations under each load section, the relative deviations of the primary wind speeds of the two cutting circles in the furnace are adjusted within a very small range, thereby controlling the boiler steam temperature deviation and smoke temperature deviation under different coal mill combinations. Under different coal mill combinations, consider reducing the total thermal load deviation of the two cutting circles in the furnace, thereby achieving the purpose of reducing the boiler steam temperature and smoke temperature deviation, and improving the safety and economy of boiler operation. This method provides strong support for the long-term stable operation of the boiler and ensures that the boiler can maintain optimal performance under different working conditions.

[0018] Furthermore, this method ensures the accuracy and representativeness of the test data by controlling the coal mill to reach the rated operating conditions for testing. By calculating the average value of the primary wind speed of each powder tube, the overall level of the coal mill outlet wind speed can be more intuitively understood. The primary wind speed relative deviation value calculated based on the primary wind speed value and the average value can accurately reflect the degree of difference between the wind speed of each powder tube and the overall wind speed, thereby improving the accuracy and efficiency of the test and helping to further improve the operating performance and stability of the boiler.

[0019] Furthermore, the method compares the relative deviation of the primary wind speed with the deviation range one by one, can accurately identify the powder hose that needs to be adjusted, avoids unnecessary adjustment operations, and improves the adjustment efficiency. According to the comparison results, the adjustable shrinkage holes on the powder hoses that exceed the deviation range are adjusted in a targeted manner, while the powder hoses that do not exceed the deviation range remain in their original state, ensuring the accuracy of the adjustment and effectively avoiding the negative impact on the boiler operation caused by excessive adjustment, making the entire adjustment process more rigorous and efficient, and helping to further improve the operating efficiency and stability of the boiler.

[0020] Furthermore, this method calculates the sum of the relative deviations of the primary wind speed of the left and right tangential circles respectively by considering the relative deviation of the primary wind speed of a single coal mill and the left and right tangential circle levels of the coal mill combination, and then obtains the sum of the relative deviations of the primary wind speed of the entire coal mill combination. This can more accurately reflect the balance of the wind speed distribution inside the coal mill combination, making the adjustment more in line with the actual operation needs of the boiler, helping to improve the operating efficiency and stability of the boiler, reduce the deviations of the steam temperature and the smoke temperature, and further improve the combustion performance of the boiler.

[0021] Furthermore, by comparing the absolute values ​​of the sum of the relative deviations of the primary wind speeds of the right and left circles of the grinding group one by one, the method can accurately identify which coal mill combinations have relative deviations of the primary wind speeds that exceed an acceptable range, thereby guiding subsequent adjustments. For coal mill combinations whose relative deviations of the primary wind speeds are within an acceptable range, no adjustments are required, thus avoiding unnecessary operations, improving adjustment efficiency, ensuring the accuracy and pertinence of the adjustments, and helping to reduce blindness and arbitrariness in the adjustment process, thereby improving the operating efficiency and stability of the boiler, and providing a more scientific and reasonable method for adjusting the steam temperature and smoke temperature deviations of octagonal double-cut circle boilers.

[0022] Furthermore, the method compares the absolute value of the sum of the relative deviations of the primary wind speeds of the grinding groups of the coal mill combination that needs to be adjusted with a preset threshold value, and based on the comparison result, further selects the coal mill with the largest absolute value of the sum of the relative deviations of the primary wind speeds of the cutting circle for adjustable shrinkage hole adjustment. The method can accurately locate the coal mill with the largest wind speed deviation, and quickly improve the wind speed distribution by adjusting the adjustable shrinkage hole of its powder pipe, thereby effectively reducing the deviation of the steam temperature and the smoke temperature, improving the adjustment efficiency, ensuring the accuracy of the adjustment, avoiding unnecessary adjustment operations, and further improving the operating efficiency and stability of the boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a flow chart of a method for adjusting the deviation of steam temperature and smoke temperature of an octagonal double tangential circle boiler proposed by the present invention; Figure 2 This is a top view of the layout of the octagonal burners of an existing boiler. DETAILED DESCRIPTION

[0024] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0029] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0030] See also Figure 1 The present invention proposes a method for adjusting the deviation of steam temperature and smoke temperature of an octagonal double tangential circle boiler, comprising the following steps: S1. Conduct a wind speed test on the coal mill under hot powder conditions to obtain the relative deviation value of the wind speed of the powder pipe in the coal mill. ; Specifically, according to DL / T 467 standard, under the rated working conditions of the coal mill, the coal feed rate and inlet air volume of the coal mill are manually operated, and the primary air velocity value of each powder pipe at the outlet of the coal mill is obtained through the detection device. , based on the primary wind speed value of each powder hose Calculate the average wind speed of each powder hose ; Then pass the wind speed value once and the average wind speed Calculate the relative deviation of the primary wind speed at the coal mill outlet ; Relative deviation The calculation process is:

[0031] in, is the relative deviation of the primary air velocity at the outlet powder pipe of the coal mill, the unit is %; is the primary air velocity of the coal mill outlet powder pipe, in m / s; It is the average primary wind speed of each powder pipe at the outlet of the coal mill, in m / s.

[0032] S2, based on the relative deviation value of the primary wind speed Compare the results with the preset deviation range and calculate the relative deviation value of the primary wind speed. The adjustable shrinkage hole on the powder hose corresponding to the deviation range is adjusted; Specifically, the deviation range is set to -10%~+10%, and S1 is calculated to obtain the relative deviation of the wind speed. Compare with the deviation range to determine whether -10%~+10% is within the deviation range. If it exceeds the deviation range, adjust the relative deviation of the primary wind speed. The adjustable shrinkage hole on the outlet powder pipe of the corresponding coal mill; if the relative deviation of the primary wind speed If the deviation range is not exceeded, the adjustable shrinkage hole on the outlet powder pipe of the coal mill corresponding to -10%~+10% will not be adjusted; during the adjustment process, if the primary air speed of the powder pipe in the coal mill is too high, the adjustable shrinkage hole on the powder pipe will be closed; if the opening of the adjustable shrinkage hole on the powder pipe is too small and cannot be closed further, the adjustable shrinkage holes on other powder pipes with lower primary air speeds will be opened, so that the relative deviation of the primary air speed at the outlet of the coal mill is finally within the range of -10%~+10%; similarly, the adjustment method for low primary air speed is opposite.

[0033] S3, repeat S1~S2 until the relative deviation of the primary wind speed of all powder pipes in all coal mills is If all of them are within the deviation range, so that the relative deviation of the primary wind speed at the outlet of each coal mill is within the range of -10%~+10%, then stop repeating S1~S2 and obtain the relative deviation of the primary wind speed of all powder pipes under the rated working conditions of the coal mill. The coal mill that is within the deviation range then proceeds to S4.

[0034] S4, arbitrarily combine the coal mills adjusted by S3 to obtain a coal mill combination, and obtain the relative deviation of the primary wind speed of the coal mills in the coal mill combination , based on the relative deviation of the primary wind speed The sum of the relative deviations of the primary wind speed of the grinding group is calculated; based on the comparison result of the absolute value of the sum of the relative deviations of the primary wind speed of the grinding group and the preset threshold value, the adjustable shrinkage hole in the corresponding coal mill is adjusted; Specifically, the preset judgment value is 0; Relative deviation of primary air velocity of all powder hoses in any combination S3 The coal mills within the deviation range are used to obtain different coal mill combinations. Usually, when the boiler is operated under different loads, the coal mill combinations are mainly six-mill, five-mill, four-mill and three-mill operation. In this embodiment, the coal mills are numbered A, B, C, D, E and F in sequence, corresponding to the arrangement of the burners on each layer of the boiler from low to high. Therefore, the coal mill combinations include ABCDEF for six mills, ABCDE and BCDEF for five mills; ABCD, BCDE and CDEF for four mills; BCD and CDE for three mills, and the relative deviation of the primary wind speed in different coal mill combinations is obtained when the burners on each layer in the coal mill combination are under different operation combinations. , through a relative deviation of wind speed Calculate the sum of the relative deviations of the primary wind speeds of the two tangential circles in the furnace of the coal mill respectively. ; Among them, the two tangential circles include the left tangential circle and the right tangential circle, that is, the sum of the relative deviations of the wind speed of the tangential circle is calculated The sum of the relative deviations of the wind speed of the left tangent circle is The sum of the relative deviations of the wind speed of the right tangent circle is ; Specifically, the sum of the relative deviations of the primary wind speed on the left tangent circle is The sum of the relative deviations of the first wind speed of the right tangent circle The calculation process is: The powder pipes at the outlet of a single coal mill corresponding to the two sections on the furnace are numbered, such as Figure 2 As shown, the powder tubes on the left tangent circle are numbered as the first powder tube, the second powder tube, the seventh powder tube and the eighth powder tube, and the powder tubes on the right tangent circle are numbered as the third powder tube, the fourth powder tube, the fifth powder tube and the sixth powder tube; Obtain the relative deviation of the primary wind speed of the powder hoses numbered as the first powder hose, the second powder hose, the seventh powder hose, and the eighth powder hose in the left tangent circle in sequence , and the first relative wind speed deviation is obtained in turn , The second relative deviation of wind speed , The 7th wind speed relative deviation Relative deviation from the eighth wind speed , based on the first relative deviation of wind speed , The second relative deviation of wind speed , The 7th wind speed relative deviation Relative deviation from the eighth wind speed Calculate the sum of the relative deviations of the left-tangential circle primary wind speed corresponding to the coal mill ; That is, the sum of the relative deviations of the primary wind speed of the left tangent circle of the coal mill labeled A is The sum of the relative deviations of the primary wind speed of the left tangent circle of the coal mill labeled B is The sum of the relative deviations of the primary wind speed of the left tangent circle of the coal mill marked C is The sum of the relative deviations of the primary wind speed of the left tangent circle of the coal mill marked D is The sum of the relative deviations of the primary wind speed of the left tangent circle of the coal mill labeled E is The sum of the relative deviations of the primary wind speed of the left tangent circle of the coal mill marked F is ; The sum of the relative deviations of the primary wind speed on the left tangent circle The calculation process is:

[0035] in, is the sum of the relative deviations of the primary wind speed of the left tangential circle in the furnace corresponding to the outlet of the j coal mill, %; , , , is the relative deviation of the primary wind speed corresponding to the first powder pipe, the second powder pipe, the seventh powder pipe and the eighth powder pipe at the outlet of the j coal mill, %, and j is the number of the coal mill.

[0036] The sum of the relative deviations of the primary wind speed of the left tangent circle of the coal mill labeled A is: The sum of the relative deviations of the primary wind speed of the left tangent circle of the coal mill labeled B is The sum of the relative deviations of the primary wind speed of the left tangent circle of the coal mill marked C is The sum of the relative deviations of the primary wind speed of the left tangent circle of the coal mill marked D is The sum of the relative deviations of the primary wind speed of the left tangent circle of the coal mill labeled E is The sum of the relative deviations of the primary wind speed of the left tangent circle of the coal mill labeled F is The sum of the relative deviations of the primary wind speed of the left tangent circle of the mill group of different coal mill combinations is calculated respectively. That is, the sum of the relative deviations of the primary wind speed of the left tangent circle of the six-mill ABCDEF coal mill combination is the sum of the relative deviations of the primary wind speed of the first mill group. The coal mill combination is five mills ABCDE. The sum of the relative deviations of the first wind speed of the left tangent circle of the mill group is the sum of the relative deviations of the first wind speed of the second mill group. The coal mill combination is five mills BCDEF. The sum of the relative deviations of the primary wind speed of the left tangent circle of the mill group is the sum of the relative deviations of the primary wind speed of the third mill group. The coal mill combination is four mills ABCD. The sum of the relative deviations of the primary wind speed of the left tangent circle of the mill group is the sum of the relative deviations of the primary wind speed of the fourth mill group. The coal mill combination is four mills BCDE. The sum of the relative deviations of the primary wind speed of the left tangent circle of the mill group is the sum of the relative deviations of the primary wind speed of the fifth mill group. The coal mill combination is four mills CDEF. The sum of the relative deviations of the primary wind speed of the left tangent circle of the mill group is the sum of the relative deviations of the primary wind speed of the sixth mill group. The coal mill combination is three mills BCD. The sum of the relative deviations of the primary wind speed of the left tangent circle of the mill group is the sum of the relative deviations of the primary wind speed of the seventh mill group. The coal mill combination is three mills CDE. The sum of the relative deviations of the primary wind speed of the left tangent circle of the grinding group is the sum of the relative deviations of the primary wind speed of the eighth grinding group. ; Among them, the sum of the relative deviations of the primary wind speed of the first grinding group is The calculation process is:

[0037] The sum of relative deviations of the primary wind speed of the second grinding group The calculation process is:

[0038] The sum of relative deviations of the primary wind speed of the third grinding group The calculation process is:

[0039] The sum of the relative deviations of the primary wind speed of the fourth grinding group The calculation process is:

[0040] The sum of relative deviations of the primary wind speed of the fifth grinding group The calculation process is:

[0041] The sum of relative deviations of the primary wind speed of the sixth grinding group The calculation process is:

[0042] The sum of the relative deviations of the primary wind speed of the seventh grinding group The calculation process is:

[0043] The sum of relative deviations of the primary wind speed of the eighth grinding group The calculation process is:

[0044] in, The sum of the relative deviations of the primary wind speed of the left tangent circle of the coal mill marked as A; The sum of the relative deviations of the primary wind speeds of the left tangent circles of the coal mills marked as B; The sum of the relative deviations of the primary wind speeds of the left tangent circles of the coal mill marked as C; The sum of the relative deviations of the primary wind speed of the left tangent circle of the coal mill marked as D; The sum of the relative deviations of the primary wind speeds of the left tangent circles of the coal mills marked as E; The sum of the relative deviations of the primary wind speeds of the left tangent circles of the coal mills marked F; If the sum of the relative deviations of the primary wind speed of the first grinding group , the sum of the relative deviations of the primary wind speed of the second grinding group , the sum of the relative deviations of the primary wind speed of the third grinding group , the sum of the relative deviations of the primary wind speed of the fourth grinding group , the sum of the relative deviations of the primary wind speed of the fifth grinding group , the sum of the relative deviations of the primary wind speed of the sixth grinding group , the sum of the relative deviations of the primary wind speed of the seventh grinding group And the sum of the relative deviations of the primary wind speed of the eighth grinding group If the absolute value of is greater than 0, it means that the steam temperature and smoke temperature on the left side of the coal mill combination are too high and need to be adjusted; if the sum of the relative deviations of the primary wind speed of the first grinding group , the sum of the relative deviations of the primary wind speed of the second grinding group , the sum of the relative deviations of the primary wind speed of the third grinding group , the sum of the relative deviations of the primary wind speed of the fourth grinding group , the sum of the relative deviations of the primary wind speed of the fifth grinding group , the sum of the relative deviations of the primary wind speed of the sixth grinding group , the sum of the relative deviations of the primary wind speed of the seventh grinding group And the sum of the relative deviations of the primary wind speed of the eighth grinding group If the absolute value of is less than 0, it means that the steam temperature and smoke temperature on the left side of the coal mill combination are too low and do not need to be adjusted; Obtain the relative deviation of the primary wind speed of the powder hoses numbered as the third powder hose, the fourth powder hose, the fifth powder hose, and the sixth powder hose in the right tangent circle in sequence , and the third relative deviation of wind speed is obtained in turn , the fourth wind speed relative deviation , The fifth relative deviation of wind speed Relative deviation from the sixth wind speed , based on the third relative deviation of wind speed , the fourth wind speed relative deviation , The fifth relative deviation of wind speed Relative deviation from the sixth wind speed Calculate the sum of the relative deviations of the wind speed of the right tangent circle ; That is, the sum of the relative deviations of the primary wind speed of the right tangent circle of the coal mill labeled A is The sum of the relative deviations of the primary wind speed of the right tangent circle of the coal mill labeled B is The sum of the relative deviations of the primary wind speed of the right tangent circle of the coal mill marked as C is The sum of the relative deviations of the primary wind speed of the right tangent circle of the coal mill marked D is The sum of the relative deviations of the primary wind speed of the right tangent circle of the coal mill marked as E is The sum of the relative deviations of the primary wind speed of the right tangent circle of the coal mill marked F is ; The sum of the relative deviations of the wind speed of the right tangent circle is The calculation process is:

[0045] in, is the sum of the relative deviations of the primary wind speed of the right tangential circle in the furnace corresponding to the outlet of the j coal mill, %; , , and is the relative deviation of the primary wind speed corresponding to the third powder pipe, the fourth powder pipe, the fifth powder pipe and the sixth powder pipe at the outlet of the j coal mill, %, and j is the number of the coal mill.

[0046] The sum of the relative deviations of the primary wind speed of the right tangent circle of the coal mill labeled A is The sum of the relative deviations of the primary wind speed of the right tangent circle of the coal mill labeled B is The sum of the relative deviations of the primary wind speed of the right tangent circle of the coal mill marked as C is The sum of the relative deviations of the primary wind speed of the right tangent circle of the coal mill marked D is The sum of the relative deviations of the primary wind speed of the right tangent circle of the coal mill marked as E is The sum of the relative deviations of the primary wind speed of the right tangent circle of the coal mill marked F is The sum of the relative deviations of the primary wind speed of the right tangent circle of the mill group of different coal mill combinations is calculated respectively. ; That is, the sum of the relative deviations of the primary wind speed of the right tangent circle of the mill group with six mills ABCDEF is the sum of the relative deviations of the primary wind speed of the ninth mill group The coal mill combination is five mills ABCDE. The sum of the relative deviations of the primary wind speed of the right tangent circle of the mill group is the sum of the relative deviations of the primary wind speed of the tenth mill group. The coal mill combination is five mills BCDEF. The sum of the relative deviations of the primary wind speed of the right tangent circle of the mill group is the sum of the relative deviations of the primary wind speed of the eleventh mill group. The sum of the relative deviations of the primary wind speed of the right tangent circle of the coal mill group with four mills ABCD is the sum of the relative deviations of the primary wind speed of the twelfth mill group. The coal mill combination is four mills BCDE. The sum of the relative deviations of the primary wind speed of the right tangent circle of the mill group is the sum of the relative deviations of the primary wind speed of the thirteenth mill group. The coal mill combination is four mills CDEF. The sum of the relative deviations of the primary wind speed of the right tangent circle of the mill group is the sum of the relative deviations of the primary wind speed of the fourteenth mill group. The coal mill combination is three mills BCD. The sum of the relative deviations of the primary wind speed of the right tangent circle of the mill group is the sum of the relative deviations of the primary wind speed of the fifteenth mill group. The coal mill combination is three mills CDE. The sum of the relative deviations of the primary wind speed of the right tangent circle of the mill group is the sum of the relative deviations of the primary wind speed of the sixteenth mill group. ; The sum of the relative deviations of the primary wind speed of the ninth grinding group The calculation process is:

[0047] The sum of the relative deviations of the primary wind speed of the tenth grinding group The calculation process is:

[0048] The sum of relative deviations of the primary wind speed of the eleventh grinding group The calculation process is:

[0049] The sum of relative deviations of the primary wind speed of the twelfth grinding group The calculation process is:

[0050] The sum of relative deviations of the primary wind speed of the 13th grinding group The calculation process is:

[0051] The sum of relative deviations of the primary wind speed of the 14th grinding group The calculation process is:

[0052] The sum of relative deviations of the primary wind speed of the fifteenth grinding group The calculation process is:

[0053] The sum of relative deviations of the primary wind speed of the 16th grinding group The calculation process is:

[0054] in, The sum of the relative deviations of the primary wind speeds of the right tangent circles of the coal mills marked as A; The sum of the relative deviations of the primary wind speeds of the right tangent circles of the coal mills marked with B; The sum of the relative deviations of the primary wind speeds of the right tangent circles of the coal mills marked as C; The sum of the relative deviations of the primary wind speeds of the right tangent circles of the coal mills marked as D; The sum of the relative deviations of the primary wind speeds of the right tangent circles of the coal mills marked as E; The sum of the relative deviations of the primary wind speeds of the right tangent circles of the coal mills marked F; If the sum of the relative deviations of the primary wind speed of the ninth grinding group , the sum of the relative deviations of the primary wind speed of the tenth grinding group , the sum of the relative deviations of the primary wind speed of the eleventh grinding group , the sum of the relative deviations of the primary wind speed of the twelfth grinding group , the sum of the relative deviations of the primary wind speed of the 13th grinding mill group , the sum of the relative deviations of the primary wind speed of the 14th grinding mill group , the sum of the relative deviations of the primary wind speed of the fifteenth grinding group And the sum of the relative deviations of the primary wind speed of the 16th grinding group If the absolute value is greater than 0, it means that the steam temperature and smoke temperature on the right side of the coal mill combination are too high and need to be adjusted; if the sum of the relative deviations of the primary wind speed of the ninth grinding group , the sum of the relative deviations of the primary wind speed of the tenth grinding group , the sum of the relative deviations of the primary wind speed of the eleventh grinding group , the sum of the relative deviations of the primary wind speed of the twelfth grinding group , the sum of the relative deviations of the primary wind speed of the 13th grinding mill group , the sum of the relative deviations of the primary wind speed of the 14th grinding mill group , the sum of the relative deviations of the primary wind speed of the fifteenth grinding group And the sum of the relative deviations of the primary wind speed of the 16th grinding group If the absolute value of is less than 0, it means that the right steam temperature and smoke temperature in the coal mill combination are too low and do not need to be adjusted, so the coal mill combination that needs to be adjusted is determined; S5, based on the comparison result between the absolute value of the sum of the relative deviations of the primary wind speeds of the grinding group of the coal mill combination that needs to be adjusted and a preset threshold, adjusting the adjustable shrinkage hole in the corresponding coal mill; The sum of the relative deviations of the primary wind speed of the right tangent circle of the coal mill combination that needs to be adjusted will be determined. The absolute value of the left tangential circle of the grinding group and the relative deviation of the primary wind speed The absolute values ​​of are compared with the preset thresholds respectively; If the coal mill combination needs to be adjusted, the sum of the relative deviations of the primary wind speed of the right tangential circle of the grinding group If the absolute value of the wind speed is greater than the preset threshold, the sum of the relative deviations of the first wind speed of the right tangent circle of the grinding group is The sum of the relative deviations of the primary wind speed of all right-tangent circles in the corresponding coal mill combination The absolute value of the right tangent circle is compared, and the sum of the relative deviations of the wind speed is selected. The maximum value among the absolute values ​​of is used to adjust the size of the adjustable shrinkage hole of the powder tube corresponding to the maximum value; similarly, if the sum of the relative deviations of the left tangential circle primary wind speed of the coal mill combination needs to be adjusted The absolute value of is greater than the preset threshold, and the corresponding adjustment is completed; in this embodiment, the preset threshold is 10%~15%.

[0055] S6, repeat S4-S5 until the absolute value of the sum of the relative deviations of the wind speeds of all coal mill combinations is less than the preset threshold, stop repeating S4-S5, and proceed to S7.

[0056] S7. Obtain the current operating parameters of the unit under all coal mill combinations, compare and verify the current operating parameters of the unit with the historical operating parameters before the coal mill adjustment, and determine the optimal coal mill combination.

[0057] Specifically, the coal mill combination adjusted by S6 is operated, different loads are applied, the current operating parameters of the unit in all coal mill combinations are obtained, the current operating parameters are compared with the historical operating parameters of the unit before the coal mill adjustment for verification, and the optimal coal mill combination is determined, that is, the coal mill combination with the smallest deviation of steam temperature and flue gas temperature on both sides is selected. Among them, the current operating parameters include the main steam temperature, reheat steam temperature, and furnace outlet flue gas temperature on the left and right sides of the boiler.

[0058] The method is further explained below with reference to the embodiments; Taking the octagonal double-tangent boiler of a 1050MW ultra-supercritical unit in a power plant as an experimental example, the low-temperature reheater (first level) and low-temperature superheater (first level) of the boiler are arranged in the front and rear shafts of the tail flue, respectively, and are all countercurrent arrangements; the partition screen superheater (second level), screen superheater (third level), final superheater (fourth level) and final reheater (second level) are arranged in the upper furnace, flame angle and horizontal flue, respectively, and all superheater, reheater and economizer components are arranged in series. The pulverizing system adopts a medium-speed mill positive pressure direct blowing system, equipped with 6 HP1163 / Dyn coal mills with dynamic separators, each coal mill outlet has 4 powder pipes, each powder pipe is divided into two branch pipes connected to the adjacent burners on the same floor, and each mill supplies 8 burners on one floor; the steam temperature and flue gas temperature deviation adjustment test of the octagonal double-tangent boiler of the 1050MW ultra-supercritical unit was carried out; the test results are shown in Tables 1 to 4 below; Table 1 Test results of outlet primary wind speed at rated output of each coal mill

[0059] Table 2 Test results of each coal mill after the outlet primary wind speed is adjusted at rated output

[0060] Table 3 The sum of relative deviations of the primary wind speed corresponding to the left and right tangential circles of the furnace under various coal mill combinations before and after adjustment (unit, %)

[0061] Table 4 Comparison of boiler steam temperature and smoke temperature deviation before and after adjustment

[0062] It can be seen from Tables 1 to 4 that before the adjustment, the relative deviation of the primary wind speed at the outlet of the A and B coal mills was large. When the boiler was operated in the combination of ABCDEF, ABCDE, BCDE, ABCD and BCD coal mills under various loads, the absolute value of the sum of the relative deviations of the primary wind speed corresponding to the left or right tangential circle of the furnace exceeded 10%, and due to the large deviations of the flue gas temperature and steam temperature on both sides, the main steam temperature was far from the design value; after the adjustment, the absolute value of the sum of the relative deviations of the primary wind speed corresponding to the left or right tangential circle of the boiler was controlled within 10%, the deviations of the flue gas temperature and steam temperature on both sides of the boiler under different loads and different coal mill combinations were improved, the maximum deviation of the flue gas temperature on both sides of the furnace outlet was reduced from 53.3℃ to 2.4℃, the main steam temperature and reheat steam temperature were also higher than before the adjustment, and the safety and economy of the boiler operation were improved.

[0063] The present invention proposes a steam temperature and smoke temperature deviation adjustment system for an octagonal double tangential circle boiler, which is used to implement the above method, and comprises a first processing unit, a second processing unit, a third processing unit, a fourth processing unit, a fifth processing unit and a sixth processing unit; The first processing unit is configured to: perform a wind speed test on the coal mill under hot powder conditions to obtain a relative deviation of the wind speed of the powder pipe in the coal mill. ; The second processing unit is configured to: Comparing the result with a preset deviation range, adjusting the adjustable shrinkage hole on the powder hose corresponding to the relative deviation value exceeding the deviation range; The third processing unit is configured to: arbitrarily combine the coal mills adjusted by S3 to obtain a coal mill combination, and obtain a relative deviation of the primary wind speed of the coal mill combination , based on the relative deviation of the primary wind speed The calculated sum of the relative deviations of the primary wind speed of the mill group determines the coal mill combination that needs to be adjusted; The fourth processing unit is configured to adjust the adjustable shrinkage hole in the corresponding coal mill combination based on the comparison result between the absolute value of the sum of the relative deviations of the primary wind speed of the coal mill combination to be adjusted and the preset threshold value; The fifth processing unit is configured to: obtain current operating parameters of the unit under all coal mill combinations, compare and verify the current operating parameters of the unit with historical operating parameters of the unit before the coal mill adjustment, and determine the optimal coal mill combination; The sixth processing unit is configured to output an optimal coal mill combination.

[0064] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numerals in the claims and the figure marks should not be regarded as limiting the claims involved.

[0065] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A method for adjusting the deviation of steam temperature and smoke temperature of an octagonal double tangential circle boiler, characterized in that: The following steps are involved: S1. Conduct a wind speed test on the coal mill under hot powder conditions to obtain the relative deviation of the wind speed of the powder pipe in the coal mill. ; S2, based on the relative deviation of the primary wind speed Comparing the result with a preset deviation range, adjusting the adjustable shrinkage hole on the powder hose corresponding to the relative deviation value exceeding the deviation range; S3, repeat S1~S2 until the relative deviation of the primary wind speed of all powder pipes in all coal mills is If all are within the deviation range, stop repeating S1~S2 and proceed to S4; S4, arbitrarily combine the coal mills adjusted in S3 to obtain a coal mill combination, and obtain the relative deviation of the primary wind speed of the coal mill combination , based on the relative deviation of the primary wind speed The calculated sum of the relative deviations of the primary wind speed of the mill group determines the coal mill combination that needs to be adjusted; S5, based on the comparison result between the absolute value of the sum of the relative deviations of the primary wind speeds of the grinding group of the coal mill combination that needs to be adjusted and a preset threshold, adjusting the adjustable shrinkage hole in the corresponding coal mill combination; S6, repeat S4-S5 until the absolute value of the sum of the relative deviations of the wind speeds of all coal mill groups is less than the preset threshold, stop repeating S4-S5, and proceed to S7; S7. Obtain the current operating parameters of the unit under all the coal mill combinations, compare and verify the current operating parameters of the unit with the historical operating parameters of the unit before the coal mill adjustment, and determine the optimal coal mill combination.

2. The method for adjusting the steam temperature and smoke temperature deviation of an octagonal double tangential circle boiler according to claim 1 is characterized in that: In S1, a wind speed test is conducted on the coal mill under hot and dusty conditions, including: Control the coal mill to reach rated working conditions and obtain the primary wind speed value of each powder pipe at the coal mill outlet ; Based on the primary wind speed value Calculate the average wind speed of each powder hose ; Based on the primary wind speed value and the average wind speed Calculate the relative deviation of the primary wind speed at the coal mill outlet .

3. The method for adjusting the steam temperature and smoke temperature deviation of an octagonal double tangential circle boiler according to claim 2 is characterized in that: Based on the primary wind speed value and the average wind speed Calculate the relative deviation of the primary wind speed at the coal mill outlet The calculation process is: in, For coal mill export i Relative deviation of primary wind speed of No. powder hose; For coal mill export i The primary wind speed of the powder hose; It is the average value of the primary air velocity at the outlet powder pipe of the coal mill.

4. The method for adjusting the steam temperature and smoke temperature deviation of an octagonal double tangential circle boiler according to claim 1, characterized in that: In S2, based on the relative deviation of the primary wind speed Compare with preset deviation ranges, including: Set the deviation range; The primary wind speed relative deviation Compare with the stated deviation range; If the relative deviation of the primary wind speed If the deviation exceeds the above range, the relative deviation of the primary wind speed is adjusted. Corresponding to the adjustable shrinkage hole on the outlet powder pipe of the coal mill; If the relative deviation of the primary wind speed If the deviation does not exceed the deviation range, the relative deviation of the primary wind speed will not be adjusted. Corresponding to the adjustable shrinkage hole on the outlet powder pipe of the coal mill.

5. The method for adjusting the steam temperature and smoke temperature deviation of an octagonal double tangential circle boiler according to claim 4 is characterized in that: The deviation range is -10% to +10%.

6. The method for adjusting the steam temperature and smoke temperature deviation of an octagonal double tangential circle boiler according to claim 1, characterized in that: In S4, based on the relative deviation of the primary wind speed The sum of the relative deviations of the primary wind speed of the grinding group is calculated, including: Obtaining all the relative deviations of the primary wind speed on the left tangent circle of a single coal mill in the coal mill combination ; Based on the relative deviation of all the primary wind speeds on the left tangent circle in the coal mill Calculate the sum of the relative deviations of the left-tangential circle primary wind speed corresponding to the coal mill ; Based on the sum of the relative deviations of the primary wind speed of the left tangential circle corresponding to the coal mill The sum of the relative deviations of the primary wind speed of the left tangential circle of the coal mill combination is calculated. ; Obtaining all the relative deviations of the primary wind speed on the right tangent circle of a single coal mill in the coal mill combination ; Based on the relative deviation of all the primary wind speeds on the right tangent circle in the coal mill Calculate the sum of the relative deviations of the primary wind speed of the right tangent circle corresponding to the coal mill ; Based on the sum of the relative deviations of the primary wind speed of the right tangent circle corresponding to the coal mill The sum of the relative deviations of the primary wind speed of the right tangential circle of the coal mill combination is calculated. ; The sum of the relative deviations of the primary wind speed of the right tangent circle of the grinding group is sorted out. and the sum of the relative deviation of the primary wind speed of the left tangent circle of the grinding group , get the sum of relative deviations of primary wind speed of the grinding group; The coal mill combination that needs to be adjusted is determined based on the sum of the relative deviations of the primary wind speeds of the grinding groups.

7. The method for adjusting the steam temperature and smoke temperature deviation of an octagonal double tangential circle boiler according to claim 6 is characterized in that: The method of determining the coal mill combination that needs to be adjusted based on the sum of the relative deviations of the primary wind speeds of the grinding mill groups comprises: Preset judgment value; The sum of the relative deviations of the primary wind speed of the right tangent circle of the grinding group and the sum of the relative deviation of the primary wind speed of the left tangent circle of the grinding group Take the absolute value to get the sum of the relative deviations of the primary wind speed of the right tangent circle of the grinding group. The absolute value of and the relative deviation of the primary wind speed of the left tangent circle of the grinding group The absolute value of The sum of the relative deviations of the wind speed of the right tangent circle of the grinding group The absolute value of and the relative deviation of the primary wind speed of the left tangent circle of the grinding group The absolute values ​​of are compared with the preset judgment values ​​respectively; If the sum of the relative deviations of the primary wind speed of the right tangent circle of the grinding group If the absolute value of is greater than the preset judgment value, the sum of the relative deviations of the primary wind speed of the right tangent circle of the grinding group is determined. The coal mill combination corresponding to the absolute value of needs to be adjusted; if the sum of the relative deviations of the primary wind speed of the right tangent circle of the grinding group If the absolute value of is less than the preset judgment value, the sum of the relative deviations of the primary wind speed of the right tangent circle of the grinding group is determined. The coal mill combination corresponding to the absolute value of does not need to be adjusted; If the sum of the relative deviations of the primary wind speed of the left tangent circle of the grinding group If the absolute value of is greater than the preset judgment value, the sum of the relative deviations of the primary wind speed of the left tangential circle of the grinding group is determined. The coal mill combination corresponding to the absolute value of needs to be adjusted; if the sum of the relative deviations of the left tangential circle wind speed of the grinding group If the absolute value of is less than the preset judgment value, the sum of the relative deviations of the primary wind speed of the left tangential circle of the grinding group is determined. The coal mill combination corresponding to the absolute value does not need to be adjusted.

8. The method for adjusting the steam temperature and smoke temperature deviation of an octagonal double tangential circle boiler according to claim 1 is characterized in that: The step S5 is based on comparing the absolute value of the sum of the relative deviations of the primary wind speeds of the coal mill combination that needs to be adjusted with a preset threshold, and includes: The absolute values ​​of the sums of the relative deviations of the primary wind speeds of the coal mill groups that need to be adjusted are compared with the preset threshold values ​​respectively; If the absolute value of the sum of the relative deviations of the primary wind speed of the coal mill combination to be adjusted is greater than the preset threshold, the sum of the relative deviations of the primary wind speed of all the tangential circles in the coal mill group corresponding to the sum of the relative deviations of the primary wind speed of the coal mill group is calculated. The absolute value of the wind speed of the cutting circle is compared, and the sum of the relative deviations of the wind speed of the cutting circle is selected. The maximum value among the absolute values ​​of is adjusted to correspond to the adjustable shrinkage hole of the powder pipe on the coal mill.

9. The method for adjusting the steam temperature and smoke temperature deviation of an octagonal double tangential circle boiler according to claim 8, characterized in that: The preset threshold is 10%~15%.

10. A steam temperature and smoke temperature deviation adjustment system for an octagonal double tangential circle boiler, used to implement the method according to any one of claims 1 to 9, characterized in that: include: The first processing unit is configured to: perform a wind speed test on the coal mill under hot powder-carrying conditions to obtain a relative deviation of the wind speed of the powder pipe in the coal mill. ; The second processing unit is configured to: Comparing the result with a preset deviation range, adjusting the adjustable shrinkage hole on the powder hose corresponding to the relative deviation value exceeding the deviation range; The third processing unit is configured to: arbitrarily combine the coal mills adjusted by S3 to obtain a coal mill combination, and obtain a relative deviation of the primary wind speed of the coal mill combination , based on the relative deviation of the primary wind speed The calculated sum of the relative deviations of the primary wind speed of the mill group determines the coal mill combination that needs to be adjusted; The fourth processing unit is configured to adjust the adjustable shrinkage hole in the corresponding coal mill combination based on the comparison result between the absolute value of the sum of the relative deviations of the primary wind speed of the coal mill combination to be adjusted and the preset threshold value; The fifth processing unit is configured to: obtain current operating parameters of the unit under all coal mill combinations, compare and verify the current operating parameters of the unit with historical operating parameters of the unit before the coal mill adjustment, and determine the optimal coal mill combination; The sixth processing unit is configured to output an optimal coal mill combination.

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