A method and system for adjusting steam and smoke temperature deviations of an octagonal double-tangential-circle boiler

Abstract

The present invention proposes a method and system for adjusting the deviation of steam temperature and smoke temperature of an octagonal double-tangential circle boiler, comprising the steps of obtaining a relative deviation of a primary wind speed of a coal mill during a primary wind speed test; adjusting an adjustable shrinkage hole on a powder tube based on a comparison result of the relative deviation of the primary wind speed with a preset deviation range; obtaining the relative deviation of the primary wind speed of any combination of coal mills, and determining the coal mill combination that needs to be adjusted based on the relative deviation of the primary wind speed; adjusting the corresponding adjustable shrinkage hole based on a comparison of 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 and a preset threshold value; obtaining the current operating parameters of the unit, comparing the current operating parameters with the historical operating parameters of the unit for verification, and determining the optimal coal mill combination.

Description

Technical Field

[0001] The invention belongs to the technical field of optimization and adjustment of power station boilers, and in particular relates 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. 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 in million-kilowatt units due to its unique advantages.

[0003] Compared to the traditional four-corner single tangential circle combustion method, the octagonal double tangential circle combustion method demonstrates superior performance, with a lower heat load per burner. This means that, given the same boiler capacity, the heat load pressure on each burner is effectively dispersed, thereby improving combustion stability and efficiency. Furthermore, the octagonal reverse double tangential circle arrangement further enhances flue gas disturbance within the furnace, resulting in more even flue gas distribution and effectively reducing and weakening left-right deviations in the flue gas at the furnace outlet.

[0004] However, despite the many advantages of the octagonal double-tangential circle combustion method, it still faces some challenges during actual operation, especially the problem of residual rotation of the flue gas at the furnace outlet. This problem often leads to deviations in the flue gas temperature and steam temperature, which in turn causes overheating of the heating surface tube wall. This phenomenon not only affects the normal operation of the unit, but may also have a serious impact on the safety and economy of the unit. The methods currently 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 horizontal swing angles of the secondary air distribution and the overburnt air is poor in reducing the steam temperature and smoke temperature deviation of the octagonal double tangential circle boiler, 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 pulverizer combinations, the method considers reducing the total heat load deviation of the two tangential 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.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] 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:

[0008] 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. ;

[0009] 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;

[0010] 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;

[0011] 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 sum of the relative deviations of the primary wind speed of the grinding group is calculated to determine the coal mill combination that needs to be adjusted;

[0012] S5. Based on a 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 assembly that needs to be adjusted and a preset threshold, adjusting the adjustable shrinkage hole in the corresponding coal mill assembly;

[0013] S6, repeat S4-S5 until the absolute value of the sum of the relative deviations of the tangential wind speeds of all coal mill combinations is less than the preset threshold, stop repeating S4-S5, and proceed to S7;

[0014] S7. 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 coal mill adjustment, and determine the optimal coal mill combination.

[0015] Preferably, the wind speed test of the coal mill is performed under hot and dusty conditions in S1, including:

[0016] 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 ;

[0017] Based on the primary wind speed value Calculate the average wind speed of each powder hose ;

[0018] 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 .

[0019] 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:

[0020]

[0021] in, For coal mill export i Relative deviation of the primary air velocity of the powder hose; For coal mill export i Primary air velocity of the powder hose; It is the average value of the primary air velocity at the outlet powder pipe of the coal mill.

[0022] Preferably, the step S2 is based on the primary wind speed relative deviation Compare with pre-set deviation ranges, including:

[0023] Set a deviation range;

[0024] The primary wind speed relative deviation Compare with the stated deviation range;

[0025] If the relative deviation of the primary wind speed If the deviation range is exceeded, 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;

[0026] If the relative deviation of the primary wind speed If the deviation does not exceed the above 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.

[0027] Preferably, the deviation range is -10% to +10%.

[0028] Preferably, the S4 is based on a 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:

[0029] Obtain all the relative deviations of the primary wind speed on the left tangent circle of a single coal mill in the coal mill combination ;

[0030] 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 ;

[0031] Based on the sum of the relative deviations of the primary wind speed of the left tangential circle corresponding to the coal mill Calculate the sum of the relative deviations of the primary wind speed of the left tangential circle of the coal mill combination ;

[0032] Obtain all the relative deviations of the primary wind speed on the right tangent circle of a single coal mill in the coal mill combination ;

[0033] 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 tangential circle corresponding to the coal mill ;

[0034] Based on the sum of the relative deviations of the primary wind speed of the right tangential circle corresponding to the coal mill Calculate the sum of the relative deviations of the primary wind speed of the right tangential circle of the coal mill combination ;

[0035] The sum of the relative deviations of the primary wind speed of the right tangential circle of the grinding group is sorted out and the sum of the relative deviations of the primary wind speed of the left tangential circle of the grinding group , get the sum of the relative deviations of the primary wind speed of the grinding group;

[0036] 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.

[0037] 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:

[0038] Preset judgment value;

[0039] The sum of the relative deviations of the primary wind speed of the right tangential circle of the grinding group and the sum of the relative deviations of the primary wind speed of the left tangential 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 tangential circle of the grinding group The absolute value of the sum of the relative deviation of the primary wind speed of the left tangential circle of the grinding group The absolute value of

[0040] The sum of the relative deviations of the wind speed of the right tangent circle of the grinding group The absolute value of the sum of the relative deviation of the primary wind speed of the left tangential circle of the grinding group The absolute values ​​of are compared with the preset judgment values ​​respectively;

[0041] If 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 is greater than the preset judgment value, the sum of the relative deviations of the primary wind speed of the right tangential circle of the grinding group is determined to be 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 tangential circle of the grinding group is determined. The coal mill combination corresponding to the absolute value of does not need to be adjusted;

[0042] If the sum of the relative deviations of the primary wind speed of the left tangential 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 to be 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 to be The coal mill combination corresponding to the absolute value does not need to be adjusted.

[0043] 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 grinding groups of the coal mill combination that needs to be adjusted with a preset threshold, and includes:

[0044] Comparing 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 the preset threshold values;

[0045] If the absolute value of the sum of the relative deviations of the primary wind speed of the mill group 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 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 , and the maximum value is adjusted to correspond to the adjustable shrinkage hole of the powder pipe on the coal mill.

[0046] Preferably, the preset threshold is 10% to 15%.

[0047] 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, comprising:

[0048] 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. ;

[0049] 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;

[0050] The third processing unit is configured to: 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 sum of the relative deviations of the primary wind speed of the grinding group is calculated to determine the coal mill combination that needs to be adjusted;

[0051] a fourth processing unit configured to adjust the adjustable shrinkage hole in the corresponding coal mill assembly based on a comparison result between an absolute value of a sum of relative deviations of primary wind speeds of the coal mill assembly determined to need adjustment and a preset threshold;

[0052] The fifth processing unit is configured to: obtain current operating parameters of the unit under all the 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;

[0053] The sixth processing unit is configured to output an optimal coal mill combination.

[0054] Compared with the prior art, the present invention has the following beneficial technical effects:

[0055] 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 condition of hot powder, and then make detailed adjustments to 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 the 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. This method effectively ensures stable boiler combustion. By calculating the sum of the relative deviations of the primary air velocities of the grinding groups, the required pulverizer combination is determined. For each pulverizer combination under each load range, the relative deviations of the primary air velocities of the two tangential circles in the furnace are adjusted to a very small range, thereby controlling the boiler steam and flue gas temperature deviations under different pulverizer combinations. Under different pulverizer combinations, the total thermal load deviation of the two tangential circles in the furnace is considered to be reduced, thereby achieving the goal of reducing the deviations of the boiler steam and flue gas temperatures, thereby improving the safety and economy of boiler operation. This method provides strong support for the long-term stable operation of the boiler, ensuring that the boiler can maintain optimal performance under different operating conditions.

[0056] Furthermore, this method ensures the accuracy and representativeness of the test data by controlling the coal mill to reach the rated working 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 relative deviation value of the primary wind speed 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.

[0057] Furthermore, this 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 due to excessive adjustment, making the entire adjustment process more rigorous and efficient, and helping to further improve the operating efficiency and stability of the boiler.

[0058] 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 grinding group 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 requirements of the boiler, helping to improve the operating efficiency and stability of the boiler, reduce the deviation of the steam temperature and the flue gas temperature, and further improve the combustion performance of the boiler.

[0059] Furthermore, this method can accurately identify which coal mill combinations have a relative deviation of the primary wind speed that exceeds an acceptable range by comparing the absolute values ​​of the sum of the relative deviations of the primary wind speeds of the right-hand and left-hand circles of the grinding group one by one, thereby guiding subsequent adjustment work. For coal mill combinations with a relative deviation of the primary wind speed within an acceptable range, no adjustment is required, thus avoiding unnecessary operations, improving adjustment efficiency, ensuring the accuracy and pertinence of the adjustment, helping to reduce blindness and arbitrariness in the adjustment process, and improving the operating efficiency and stability of the boiler, providing a more scientific and reasonable method for adjusting the steam temperature and flue gas temperature deviations of octagonal double-tangential circle boilers.

[0060] Furthermore, this 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 adjustment. It 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 tube, thereby effectively reducing the deviation of the steam temperature and the flue gas 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

[0061] Figure 1 This is a flow chart of a method for adjusting the deviation of steam and flue gas temperatures in an octagonal double tangential circle boiler proposed by the present invention;

[0062] Figure 2 This is a top view of the layout of the octagonal burners in the existing boiler. DETAILED DESCRIPTION

[0063] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are to be considered as illustrative in nature and not restrictive.

[0064] 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 to 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, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0065] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0066] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0067] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0068] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0069] See also Figure 1 The present invention proposes a method for adjusting the steam temperature and smoke temperature deviation of an octagonal double tangential circle boiler, comprising the following steps:

[0070] 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. ;

[0071] 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 coal mill outlet is obtained through the detection device. , based on the primary air velocity 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 air speed at the coal mill outlet ;

[0072] Relative deviation value The calculation process is:

[0073]

[0074] 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 at the coal mill outlet powder pipe, in m / s; It is the average of the primary air velocity of each powder pipe at the outlet of the coal mill, in m / s.

[0075] 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 wind speed. If the deviation range is exceeded, the adjustable shrinkage hole on the corresponding powder hose is adjusted;

[0076] Specifically, the deviation range is set to -10%~+10%, and S1 is calculated to obtain the relative deviation of wind speed. Compare with the deviation range to determine whether -10%~+10% is within the deviation range. If the relative deviation of wind speed is If the deviation range is exceeded, the relative deviation of the wind speed will be adjusted. 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 hose of the coal mill corresponding to -10%~+10% will not be adjusted; during the adjustment process, if the primary air speed of the powder hose in the coal mill is too high, the adjustable shrinkage hole on the powder hose will be closed; if the opening of the adjustable shrinkage hole on the powder hose is small and cannot be closed further, the adjustable shrinkage holes on other powder hoses 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 the opposite.

[0077] 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 is located within the deviation range and then proceeds to S4.

[0078] 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 mills in the coal mill combination. , based on the relative deviation of the primary wind speed Calculating the sum of the relative deviations of the primary wind speeds of the grinding group; adjusting the adjustable shrinkage holes in the corresponding coal mill based on the comparison result of the absolute value of the sum of the relative deviations of the primary wind speeds of the grinding group and a preset threshold;

[0079] Specifically, the preset judgment value is 0;

[0080] Relative deviation of primary air speed of all powder hoses in any combination S3 For the coal mills within the deviation range, different coal mill combinations are obtained. 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. The relative deviation of the primary wind speed in different coal mill combinations is obtained under different operation combinations of the burners on each layer in the coal mill combination. , 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 ;

[0081] Specifically, the sum of the relative deviations of the primary wind speed of the left tangent circle is The sum of the relative deviations of the primary wind speed of the right tangent circle The calculation process is:

[0082] 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 hoses on the left tangent circle are numbered as the first powder hose, the second powder hose, the seventh powder hose, and the eighth powder hose, and the powder hoses on the right tangent circle are numbered as the third powder hose, the fourth powder hose, the fifth powder hose, and the sixth powder hose;

[0083] Obtain the relative deviation of the primary wind speed of the powder hoses numbered as the first, second, seventh and eighth powder hoses on the left tangent circle in sequence , and get 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 , 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 marked as A is The sum of the relative deviations of the primary wind speed of the left tangential circle of the coal mill marked as B is The sum of the relative deviations of the primary wind speed of the left tangential circle of the coal mill marked as C is The sum of the relative deviations of the primary wind speed of the left tangent circle of the coal mill marked as D is The sum of the relative deviations of the primary wind speed of the left tangent circle of the coal mill marked as 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 ;

[0084] The sum of the relative deviations of the primary wind speed on the left tangent circle The calculation process is:

[0085]

[0086] 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 air velocity 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.

[0087] The sum of the relative deviations of the primary wind speed of the left tangential circle of the coal mill labeled A is: The sum of the relative deviations of the primary wind speed of the left tangential circle of the coal mill marked B is The sum of the relative deviations of the primary wind speed of the left tangential circle of the coal mill marked as C is The sum of the relative deviations of the primary wind speed of the left tangential circle of the coal mill marked D is The sum of the relative deviations of the primary wind speed of the left tangential circle of the coal mill marked as E is The sum of the relative deviations of the primary wind speed of the left tangential circle of the coal mill marked F is The sum of the relative deviations of the primary wind speed of the left tangential circle of the mill group of different mill combinations is calculated respectively. That is, the sum of the relative deviations of the primary wind speed of the left tangential circle of the grinding group of six grinding mills ABCDEF is the sum of the relative deviations of the primary wind speed of the first grinding group. The coal mill combination is five mills ABCDE. The sum of the relative deviations of the primary wind speed of the left tangential circle of the grinding group is the sum of the relative deviations of the primary wind speed of the second grinding group. The coal mill combination is five mills BCDEF. The sum of the relative deviations of the primary wind speed of the left tangential circle of the grinding group is the sum of the relative deviations of the primary wind speed of the third grinding group. The coal mill combination is four mills ABCD. The sum of the relative deviations of the primary wind speed of the left tangential circle of the grinding group is the sum of the relative deviations of the primary wind speed of the fourth grinding group. The coal mill combination is four mills BCDE. The sum of the relative deviations of the primary wind speed of the left tangential circle of the grinding group is the sum of the relative deviations of the primary wind speed of the fifth grinding group. The coal mill combination is four mills CDEF. The sum of the relative deviations of the primary wind speed of the left tangential circle of the grinding group is the sum of the relative deviations of the primary wind speed of the sixth grinding group. The coal mill combination is three mills BCD. The sum of the relative deviations of the primary wind speed of the left tangential circle of the grinding group is the sum of the relative deviations of the primary wind speed of the seventh grinding group. The coal mill combination is three mills CDE. The sum of the relative deviations of the primary wind speed of the left tangential circle of the grinding group is the sum of the relative deviations of the primary wind speed of the eighth grinding group. ;

[0088] Among them, the sum of the relative deviations of the primary wind speed of the first grinding group The calculation process is:

[0089]

[0090] The sum of the relative deviations of the primary wind speed of the second grinding group The calculation process is:

[0091]

[0092] The sum of relative deviations of the primary wind speed of the third grinding group The calculation process is:

[0093]

[0094] The sum of relative deviations of the primary wind speed of the fourth grinding group The calculation process is:

[0095]

[0096] The sum of the relative deviations of the primary wind speed of the fifth grinding group The calculation process is:

[0097]

[0098] The sum of the relative deviations of the primary wind speed of the sixth grinding group The calculation process is:

[0099]

[0100] The sum of the relative deviations of the primary wind speed of the seventh grinding group The calculation process is:

[0101]

[0102] The sum of the relative deviations of the primary wind speed of the eighth grinding group The calculation process is:

[0103]

[0104] in, is the sum of the relative deviations of the primary wind speed of the left tangential circle of the coal mill labeled A; is the sum of the relative deviations of the primary wind speed of the left tangential circle of the coal mill marked as B; is the sum of the relative deviations of the primary wind speed of the left tangential circle of the coal mill marked as C; is the sum of the relative deviations of the primary wind speed of the left tangential circle of the coal mill marked as D; is the sum of the relative deviations of the primary wind speed of the left tangential circle of the coal mill marked as E; is the sum of the relative deviations of the primary wind speed of the left tangential circle of the coal mill marked as F;

[0105] 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 is greater than 0, it means that the steam temperature and smoke temperature on the left side of the pulverizer 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 flue gas temperature on the left side of the pulverizer combination are too low and do not need to be adjusted;

[0106] Obtain the relative deviation of the primary wind speed of the powder hoses numbered as the third, fourth, fifth, and sixth powder hoses on the right tangent circle in sequence , and the third relative deviation of wind speed is obtained in turn , the fourth relative deviation of wind speed , 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 relative deviation of wind speed , 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 marked as A is The sum of the relative deviations of the primary wind speed of the right tangent circle of the coal mill marked 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 as 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 ;

[0107] The sum of the relative deviations of the wind speed of the right tangent circle is The calculation process is:

[0108]

[0109] 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 air velocity 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.

[0110] The sum of the relative deviations of the primary wind speed of the right tangent circle of the coal mill marked as A is The sum of the relative deviations of the primary wind speed of the right tangent circle of the coal mill marked 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 as 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 tangential circle of the mill group of different mill combinations is calculated respectively. ; That is, the sum of the relative deviations of the primary wind speed of the right tangential 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 sum of the relative deviations of the primary wind speed of the right tangential circle of the mill group with five mills ABCDE 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 tangential circle of the grinding group is 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 right tangential circle of the grinding group of the four-grinding mill ABCD is the sum of the relative deviations of the primary wind speed of the twelfth grinding group. The coal mill combination is four mills BCDE. The sum of the relative deviations of the primary wind speed of the right tangential circle of the grinding group is the sum of the relative deviations of the primary wind speed of the thirteenth grinding group. The sum of the relative deviations of the primary wind speed of the right tangential circle of the grinding group of the coal mill with four grinding mills CDEF is the sum of the relative deviations of the primary wind speed of the fourteenth grinding group. The coal mill combination is three mills BCD. The sum of the relative deviations of the primary wind speed of the right tangential circle of the grinding group is the sum of the relative deviations of the primary wind speed of the fifteenth grinding group. The sum of the relative deviations of the primary wind speed of the right tangential circle of the grinding group of the three-grinding CDE grinding mill is the sum of the relative deviations of the primary wind speed of the sixteenth grinding mill group. ;

[0111] The sum of the relative deviations of the primary wind speed of the ninth grinding group The calculation process is:

[0112]

[0113] The sum of the relative deviations of the primary wind speed of the tenth grinding group The calculation process is:

[0114]

[0115] The sum of relative deviations of the primary wind speed of the eleventh grinding group The calculation process is:

[0116]

[0117] The sum of relative deviations of the primary wind speed of the twelfth grinding group The calculation process is:

[0118]

[0119] The sum of the relative deviations of the primary wind speed of the 13th grinding group The calculation process is:

[0120]

[0121] The sum of relative deviations of the primary wind speed of the fourteenth grinding group The calculation process is:

[0122]

[0123] The sum of the relative deviations of the primary wind speed of the fifteenth grinding group The calculation process is:

[0124]

[0125] The sum of the relative deviations of the primary wind speed of the sixteenth grinding group The calculation process is:

[0126]

[0127] in, is the sum of the relative deviations of the primary wind speed of the right tangential circle of the coal mill marked as A; is the sum of the relative deviations of the primary wind speed of the right tangential circle of the coal mill marked as B; is the sum of the relative deviations of the primary wind speeds of the right tangential circles of the coal mill marked C; The sum of the relative deviations of the primary wind speed of the right tangential circle of the coal mill marked as D; is the sum of the relative deviations of the primary wind speed of the right tangential circle of the coal mill marked as E; is the sum of the relative deviations of the primary wind speed of the right tangential circle of the coal mill marked F;

[0128] 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 thirteenth grinding group , the sum of the relative deviations of the primary wind speed of the fourteenth grinding 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 sixteenth 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 pulverizer 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 is , 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 thirteenth grinding group , the sum of the relative deviations of the primary wind speed of the fourteenth grinding 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 sixteenth grinding group If the absolute value of is less than 0, it means that the steam temperature and flue gas temperature on the right side of 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;

[0129] S5. Based on a comparison result between 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 and a preset threshold value, adjusting the adjustable shrinkage holes in the corresponding coal mill;

[0130] The sum of the relative deviations of the primary wind speed of the right tangential 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;

[0131] If the sum of the relative deviations of the primary wind speed of the right tangential circle of the coal mill combination needs to be adjusted If the absolute value of the wind speed of the grinding group is greater than the preset threshold, the sum of the relative deviations of the wind speed of the grinding group will be The sum of the relative deviations of the primary wind speed of all right-tangential circles in the corresponding coal mill combination The absolute value of the wind speed is compared, and the sum of the relative deviations of the right tangent circle is selected. The maximum value among the absolute values ​​of , 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%.

[0132] S6. Repeat S4 to S5 until the absolute value of the sum of the relative deviations of the wind speeds of the mill groups in all coal mill combinations is less than the preset threshold value, stop repeating S4 to S5, and proceed to S7.

[0133] 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.

[0134] Specifically, the pulverizer combination adjusted by S6 is operated, with different loads applied. The unit's current operating parameters for all pulverizer combinations are obtained. These parameters are then compared with the unit's historical operating parameters before the pulverizer adjustment to determine the optimal pulverizer combination, specifically the one with the smallest deviation in steam and flue gas temperature on both sides. 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.

[0135] The present method is further explained below with reference to the examples.

[0136] The experimental example is an octagonal double-tangential boiler of a 1050MW ultra-supercritical unit in a power plant. The low-temperature reheater (stage one) and low-temperature superheater (stage one) of the boiler are arranged in the front and rear vertical shafts of the tail flue, respectively, and are all arranged in countercurrent. The partition screen superheater (stage two), screen superheater (stage three), final superheater (stage four) and final reheater (stage two) are arranged in the upper furnace, flame bending angle and horizontal flue, respectively. 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 type coal mills with dynamic separators. Each coal mill has 4 powder pipes at the outlet, and each powder pipe is divided into two branch pipes connected to the adjacent burners on the same layer. Each mill supplies 8 burners on one layer. The steam temperature and flue gas temperature deviation adjustment test of the octagonal double-tangential boiler of the 1050MW ultra-supercritical unit was carried out. The test results are shown in Tables 1 to 4 below.

[0137] Table 1 Test results of outlet primary wind speed at rated output of each coal mill

[0138]

[0139] Table 2 Test results of each coal mill after the outlet primary air velocity is adjusted at rated output

[0140]

[0141] Table 3 The sum of relative deviations of primary air speeds corresponding to the left and right tangential circles of the furnace under various coal mill combinations before and after adjustment (unit: %)

[0142]

[0143] Table 4 Comparison of boiler steam temperature and flue gas temperature deviation before and after adjustment

[0144]

[0145] It can be seen from Tables 1 to 4 that before the adjustment, the relative deviation of the primary air speed at the outlet of pulverizers A and B was large. When the boiler was operated with the ABCDEF, ABCDE, BCDE, ABCD and BCD pulverizer combinations under various loads, the absolute value of the sum of the relative deviations of the primary air speed corresponding to the left or right tangential circle of the furnace exceeded 10%. In addition, due to the large deviations in 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 air speed corresponding to the left or right tangential circle of the boiler was controlled within 10%. The deviations in the flue gas temperature and steam temperature on both sides of the boiler under different loads and different pulverizer combinations were improved. The maximum deviation of the flue gas temperature on both sides of the furnace outlet was reduced from 53.3°C to 2.4°C. The main steam temperature and reheat steam temperature were also higher than before the adjustment, and the safety and economy of boiler operation were improved.

[0146] 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 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;

[0147] 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. ;

[0148] 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;

[0149] The third processing unit is configured to: 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 sum of the relative deviations of the primary wind speed of the grinding group is calculated to determine the coal mill combination that needs to be adjusted;

[0150] a fourth processing unit configured to adjust the adjustable shrinkage hole in the corresponding coal mill assembly based on a comparison result between an absolute value of a sum of relative deviations of primary wind speeds of the coal mill assembly determined to need adjustment and a preset threshold;

[0151] The fifth processing unit is configured to: obtain current operating parameters of the unit under all the 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;

[0152] The sixth processing unit is configured to output an optimal coal mill combination.

[0153] 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 that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all points of view, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that come within the meaning and range of equivalents of the claims are included in the present invention. Any reference to any number in the claims and the accompanying drawings should not be construed as limiting the claims to which they relate.

[0154] In addition, it should be understood that although this specification describes the embodiments, not every embodiment contains only one independent technical solution. This description is for clarity only. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for the purpose of illustrating the technical concept of the present invention and cannot be used to limit the scope of protection of the present invention. Any changes made based on the technical solution in accordance with the technical concept proposed by the present invention fall within the scope of protection of the claims of the present invention.

Claims

1. A method for adjusting the steam temperature and smoke temperature deviation 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 sum of the relative deviations of the primary wind speed of the grinding group is calculated to determine the coal mill combination that needs to be adjusted; S5. Based on a 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 assembly that needs to be adjusted and a preset threshold, adjusting the adjustable shrinkage hole in the corresponding coal mill assembly; S6, repeat S4-S5 until the absolute value of the sum of the relative deviations of the tangential wind speeds of all coal mill combinations is less than the preset threshold, stop repeating S4-S5, and proceed to S7; S7. 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 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, 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 the primary air velocity of the powder hose; For coal mill export i The primary air velocity 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 pre-set deviation ranges, including: Set a 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 range is exceeded, 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 above 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, the relative deviation of the primary wind speed is used The sum of the relative deviations of the primary wind speed of the grinding group is calculated, including: Obtain 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 Calculate the sum of the relative deviations of the primary wind speed of the left tangential circle of the coal mill combination ; Obtain 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 tangential circle corresponding to the coal mill ; Based on the sum of the relative deviations of the primary wind speed of the right tangential circle corresponding to the coal mill Calculate the sum of the relative deviations of the primary wind speed of the right tangential circle of the coal mill combination ; The sum of the relative deviations of the primary wind speed of the right tangential circle of the grinding group is sorted out and the sum of the relative deviations of the primary wind speed of the left tangential circle of the grinding group , get 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 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, 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 includes: Preset judgment value; The sum of the relative deviations of the primary wind speed of the right tangential circle of the grinding group and the sum of the relative deviations of the primary wind speed of the left tangential 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 tangential circle of the grinding group The absolute value of the sum of the relative deviation of the primary wind speed of the left tangential 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 the sum of the relative deviation of the primary wind speed of the left tangential 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 tangential 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 tangential circle of the grinding group is determined to be 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 tangential 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 tangential 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 to be 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 to be The coal mill combination corresponding to the absolute value does not need to be adjusted.

8. The method for adjusting the steam and smoke temperature deviations of an octagonal double tangential circle boiler according to claim 1, 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 grinding mill group of the coal mill combination that needs to be adjusted with a preset threshold, and includes: Comparing 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 the preset threshold values; If the absolute value of the sum of the relative deviations of the primary wind speed of the mill group 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 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 , and the maximum value is adjusted to correspond to the adjustable shrinkage hole of the powder pipe on the coal mill.

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

10. A steam temperature and flue gas temperature deviation adjustment system for an octagonal double tangential 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 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 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 sum of the relative deviations of the primary wind speed of the grinding group is calculated to determine the coal mill combination that needs to be adjusted; a fourth processing unit configured to adjust the adjustable shrinkage hole in the corresponding coal mill assembly based on a comparison result between an absolute value of a sum of relative deviations of primary wind speeds of the coal mill assembly determined to need adjustment and a preset threshold; The fifth processing unit is configured to: obtain current operating parameters of the unit under all the 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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