CN111878845B - Pipe wall temperature uniformity optimization control method for W-shaped flame boiler at starting stage - Google Patents
Pipe wall temperature uniformity optimization control method for W-shaped flame boiler at starting stage Download PDFInfo
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- CN111878845B CN111878845B CN202010722659.3A CN202010722659A CN111878845B CN 111878845 B CN111878845 B CN 111878845B CN 202010722659 A CN202010722659 A CN 202010722659A CN 111878845 B CN111878845 B CN 111878845B
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Abstract
The invention discloses a pipe wall temperature uniformity optimization control method for a W-shaped flame boiler at a starting stage, which comprises the steps of dividing a coal mill into a large grade, a medium grade and a small grade according to flame concentration, and then combining the three grades according to the medium, large and small modes to obtain the current operation sequence of the coal mill; carrying out a coal mill commissioning test under the condition of common coal quality based on the current commissioning sequence, obtaining a wall temperature distribution curve under the current commissioning sequence and calculating a pipe wall temperature deviation coefficient K; judging whether the commissioning test frequency reaches a preset threshold value, if so, determining the commissioning priority of the coal mill according to the commissioning sequence with the minimum pipe wall temperature deviation coefficient K, and commissioning the corresponding burners in the coal mill according to the commissioning priority; otherwise, continuously iterating by replacing the flame concentration with the pipe wall temperature deviation coefficient K. The invention can improve the temperature uniformity of the tube wall in the starting stage of the W-shaped flame boiler, reduce the deviation of the wall temperature and the steam temperature, and reduce the risks of tube explosion and tension fracture of the water-cooled wall.
Description
Technical Field
The invention relates to the field of debugging and operation of boilers, in particular to a method for optimally controlling the temperature uniformity of a tube wall in a starting stage of a W-shaped flame boiler.
Background
The W-type flame boiler (also referred to as W-flame boiler or W-type flame boiler for short) is a boiler composed of a combustion chamber (lower furnace) and a burnout chamber (upper furnace). The W-shaped flame boiler has a structure different from that of a conventional coal-fired boiler, the depth of a lower hearth is generally 80-120% greater than that of an upper hearth, and the protruding parts on two sides of the lower hearth form arch shoulders, so that the W-shaped flame boiler has more outstanding technical advantages in the aspect of burning low-volatile anthracite, and is a typical boiler for burning poor-quality coal. The W-type flame boiler generally has poor quality of coal to be fired, and is usually matched with a steel ball milling powder making system, mainly anthracite and lean coal, and has higher ignition temperature and relatively longer flame stroke, so that uneven heat load distribution is easily caused in the initial starting stage, and larger wall temperature deviation is generated. The W-type flame boiler has a large width/depth ratio in structure, the width of some 600MW W flame boilers is 32m, and the W-type flame boilers is obviously wider than a four-corner tangential unit with the same capacity, so that the wall temperature deviation is more easily caused, and the wall temperature deviation is one of the most important factors for causing the tensile crack of a water-cooled wall. In the initial starting stage of the W-shaped flame boiler, because the temperature in the boiler is low, a large amount of pulverized coal particles are difficult to burn out in the boiler, so that the combustion stroke of the pulverized coal is prolonged, the wall temperature deviation of a heating surface is large, the heat load of a partial area is high, and in the initial starting stage, the steam flow is relatively small, the heating surface cannot be sufficiently cooled, so that the heating surface is over-heated. The burners of the W-shaped flame boiler are arranged on the front arch and the rear arch of a hearth, the arrangement type of the burners considers symmetrical arrangement in design, the increase/decrease of the heat load is gradually carried out, the investment of fire nozzles has no unified standard, the influence on the wall temperature is different under the operation state of different powder making systems, and the aim cannot be achieved by only depending on the operation air distribution adjustment.
To sum up, the W-shaped flame boiler has the problems of wide hearth width and temperature deviation of the tube wall of the heating surface in the starting process, and is easy to cause tube burst and tensile crack of the water-cooled wall. The conventional treatment methods are operation combustion adjustment and hydrodynamic characteristic adjustment, but the adjustment methods do not consider the inherent characteristics of the W-shaped flame boiler, so the adjustment effect is poor.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: in order to solve the problems in the prior art, the invention provides an optimization control method for pipe wall temperature uniformity in the starting stage of a W-shaped flame boiler.
In order to solve the technical problems, the invention adopts the technical scheme that:
a method for optimally controlling the temperature uniformity of a tube wall in the starting stage of a W-shaped flame boiler comprises the following steps:
1) determining the flame concentration of each coal mill in the W-shaped flame boiler;
2) sorting the coal mills according to the flame concentration ratio, dividing the coal mills into a large grade, a medium grade and a small grade, and combining the three grades according to the medium grade, the large grade and the small grade to obtain the current operation sequence of the coal mills;
3) carrying out a coal mill commissioning test under the condition of common coal quality based on the current commissioning sequence, recording the wall temperature of a designated pipe wall temperature measuring point of the W-shaped flame boiler, obtaining a wall temperature distribution curve under the current commissioning sequence and calculating a pipe wall temperature deviation coefficient K;
4) judging whether the commissioning test frequency reaches a preset threshold value, and if so, skipping to execute the step 5); otherwise, sorting the coal mill according to the pipe wall temperature deviation coefficient K, dividing the coal mill into a large grade, a medium grade and a small grade, combining the three grades according to the medium, large and small modes to obtain the current operation sequence of the coal mill, and skipping to execute the step 3);
5) and determining the operation priority of the coal mill according to the operation sequence with the minimum pipe wall temperature deviation coefficient K, and operating the burners in the corresponding coal mill according to the operation priority.
Optionally, the calculation function of the flame concentration in step 1) is expressed as follows:
in the above formula, f (i) represents the flame concentration of the i-th coal mill, SjAnd the distance from the coordinates of the jth burner in the ith coal mill to the origin is represented, wherein the origin refers to the central point of the hearth, and m is the number of the burners contained in the ith coal mill.
Optionally, the step of combining the three grades in a medium, large and small manner to obtain the current operation sequence of the coal mill includes: combining the three grades according to a medium-sized mode, a large-sized mode and a small-sized mode to obtain a current coal mill list, alternately distributing the coal mills in the current coal mill list to X, Y two groups, and then sequentially taking out the coal mills in a symmetrical input mode in the X, Y two groups to obtain the current operation sequence of the coal mills.
Optionally, the step of sequentially taking out the coal mills by adopting a symmetrical input mode comprises:
2.1) initializing the current commissioning sequence L to be null;
2.2) if the X group is not empty, taking out a coal mill from the X group, adding the coal mill into the current operation sequence L, and skipping to execute the next step; otherwise, judging that the current commissioning sequence L is obtained completely, taking the current commissioning sequence L as the obtained current commissioning sequence, and returning;
2.3) if the Y group is empty, judging that the current commissioning sequence L is obtained completely, taking the current commissioning sequence L as the obtained current commissioning sequence, and returning; otherwise, searching coal mills taken out from the X group from the Y group and step 2.2) for the last time, wherein the coal mills are distributed in a front-back or left-right symmetrical mode relative to the central line of the boiler, if the coal mills are successfully searched, adding the coal mills into the current operation sequence L, adding k to 1, and skipping to execute the step 2.2); if the search is unsuccessful, skipping to execute the next step;
2.4) judging whether the number of coal mills added into the current operation sequence L in the X group and the number of coal mills added into the current operation sequence L in the Y group are more than or equal to 2, if so, taking out one coal mill from the Y group which has the smallest difference with the flame concentration or pipe wall temperature deviation coefficient K of the coal mill taken out from the X group at the last time in the step 2.2) and adding the coal mill into the current operation sequence L, adding K to 1, and skipping to execute the step 2.2); otherwise, the coal mill is not taken out from the Y group randomly in the current round, k is directly added with 1, and the step 2.2) is executed.
Optionally, the functional expression for calculating the pipe wall temperature deviation coefficient K in step 3) is:
in the above formula, n is the number of the temperature measuring points of the pipe wall, TjRepresents the wall temperature of the jth pipe wall temperature measuring point in the current commissioning sequence,
and (4) representing the average value of the wall temperature of n pipe wall temperature measuring points in the current commissioning sequence.
Optionally, the functional expression for calculating the pipe wall temperature deviation coefficient K in step 3) is:
in the above formula, n is the number of the temperature measuring points of the pipe wall, TjRepresents the wall temperature of the jth pipe wall temperature measuring point in the current commissioning sequence,
and (4) representing the average value of the wall temperature of n pipe wall temperature measuring points in the current commissioning sequence.
Optionally, the functional expression for calculating the pipe wall temperature deviation coefficient K in step 3) is:
in the above formula, n is the number of the temperature measuring points of the pipe wall, TjRepresents the wall temperature of the jth pipe wall temperature measuring point in the current commissioning sequence,
and (4) representing the average value of the wall temperature of n pipe wall temperature measuring points in the current commissioning sequence.
Optionally, the step 5) is followed by the step of shutting down the burners in the corresponding coal mills in reverse order of the operational priority when shutting down the coal mills.
In addition, the invention also provides a W-shaped flame boiler starting-stage pipe wall temperature uniformity optimization control system, which comprises a microprocessor and a memory, wherein the microprocessor is programmed or configured to execute the steps of the W-shaped flame boiler starting-stage pipe wall temperature uniformity optimization control method, or the memory is stored with a computer program which is programmed or configured to execute the W-shaped flame boiler starting-stage pipe wall temperature uniformity optimization control method.
In addition, the invention also provides a computer readable storage medium, wherein a computer program which is programmed or configured to execute the pipe wall temperature uniformity optimization control method in the starting stage of the W-shaped flame boiler is stored in the computer readable storage medium.
Compared with the prior art, the invention has the following advantages:
1. the method starts from the distribution of the heat load in the furnace and the temperature analysis of the heating surface, combines the position of a burner nozzle and the heat load characteristic, standardizes and unifies the start-stop sequence of the powder making system, controls the wall temperature deviation of the W-shaped flame boiler from the source of the powder making system, can improve the temperature uniformity of the wall of the W-shaped flame boiler in the starting stage, reduces the wall temperature deviation and the steam temperature deviation, and reduces the risk of tube burst and tension crack of the water wall.
2. The method adopts the flame concentration ratio to generate an initial commissioning sequence, can greatly reduce the times of the coal mill commissioning test under the condition of common coal quality, improves the efficiency of the method and reduces the implementation period of the method.
Drawings
FIG. 1 is a schematic diagram of a basic process flow of a method according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of a site layout of a boiler burner according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
As shown in fig. 1, the method for optimally controlling the temperature uniformity of the tube wall in the start-up stage of the W-type flame boiler of the embodiment includes:
1) determining the flame concentration of each coal mill in the W-shaped flame boiler;
2) sorting the coal mills according to the flame concentration ratio, dividing the coal mills into a large grade, a medium grade and a small grade, and combining the three grades according to the medium grade, the large grade and the small grade to obtain the current operation sequence of the coal mills;
3) carrying out a coal mill commissioning test under the condition of common coal quality based on the current commissioning sequence, recording the wall temperature of a designated pipe wall temperature measuring point of the W-shaped flame boiler, obtaining a wall temperature distribution curve under the current commissioning sequence and calculating a pipe wall temperature deviation coefficient K;
4) judging whether the commissioning test frequency reaches a preset threshold value, and if so, skipping to execute the step 5); otherwise, sorting the coal mill according to the pipe wall temperature deviation coefficient K, dividing the coal mill into a large grade, a medium grade and a small grade, combining the three grades according to the medium, large and small modes to obtain the current operation sequence of the coal mill, and skipping to execute the step 3);
5) and determining the operation priority of the coal mill according to the operation sequence with the minimum pipe wall temperature deviation coefficient K, and operating the burners in the corresponding coal mill according to the operation priority.
The W-shaped flame boiler (600MWW) in the embodiment is provided with 6 double-inlet and double-outlet steel ball coal mills, 24 burners are arranged in a staggered mode on the front wall and the rear wall, and the arrangement is shown in figure 2. Different coal mills are started in operation, and the wall temperature of the W-shaped flame boiler, particularly the wall temperature of a water wall, is affected differently.
In this embodiment, the calculation function expression of the flame concentration in step 1) is as follows:
in the above formula, f (i) represents the flame concentration of the i-th coal mill, SjAnd the distance from the coordinates of the jth burner in the ith coal mill to the origin is shown, wherein the origin refers to the central point of the hearth, and m is the number of burners contained in the ith coal mill. In this embodiment, f (i) represents the flame concentration of the i-th coal mill, wherein a smaller value of f (i) represents a more concentrated flame, and a larger value of f (i) represents a more dispersed flame. According to the arrangement mode and the position of the boiler burners, the central point of a hearth is taken as an original point, coordinates of all burners are divided, the positions of all burners are in one-to-one correspondence with the coordinates, and the distance from the coordinates of the jth burner in any ith coal pulverizer to the original point can be calculated.
Referring to FIG. 2, according to the arrangement of the boiler burners and the distribution of the heat load, with the geometric center line of the cross section of the furnace burner as the origin, 24 burners (A1-A4, B1-B4, C1-C4, D1-D4, E1-E4, F1-F4) of the coal mills A-F are listed on a coordinate grid according to the site location. When calculating the flame concentration, taking the coal mill a as an example, there are:
f(A)＝SA1+SA2+SA3+SA4
in the above formula, f (A) represents the flame concentration of the coal mill A, SA1～SA4The distances from the coordinates of the burners a1 to a4 to the origin are shown. Since f (i) represents the flame concentration of the ith coal mill, in order to obtain the sequencing of the flame uniformity, step 2) in the embodiment divides the coal mills into a large grade, a medium grade and a small grade after sequencing according to the flame concentration, and then combines the three grades according to the medium grade, the medium grade and the small grade to obtain the current operation sequence of the coal mills; the coal mills of the 'middle' level have the best flame uniformity, the coal mills of the 'big' level have the second best flame uniformity, and the coal mills of the 'small' level have the worst flame uniformity, so that the current operation sequence with the flame uniformity sequencing information is obtained.
As an alternative implementation, in this embodiment, the step of combining the three levels in a medium, large and small manner to obtain the current operation sequence of the coal mill includes: combining the three grades according to a medium-sized mode, a large-sized mode and a small-sized mode to obtain a current coal mill list, alternately distributing the coal mills in the current coal mill list to X, Y two groups, and then sequentially taking out the coal mills in a symmetrical input mode in the X, Y two groups to obtain the current operation sequence of the coal mills. In this embodiment, any ith coal mill in the X group is recorded as X (i), any ith coal mill in the Y group is recorded as Y (i), and i is a coal mill number. X, Y, the coal mills X (i)/Y (i) of the two groups of coal mills are primarily sorted according to the result of the concentration function, the flame concentration/pipe wall temperature deviation coefficient K is firstly sorted in the middle (middle grade), the flame concentration/pipe wall temperature deviation coefficient K is secondly sorted in the larger (large grade), the flame concentration/pipe wall temperature deviation coefficient K is secondly sorted in the smaller (small grade), the ranks with the same values are not in sequence, and the primarily set burner operation sequence can be obtained by sequentially taking out the coal mills in a symmetrical input mode. In this embodiment, the burners are symmetrically divided into two groups according to the concentration function, and the grouping principle is: according to the preliminary sequencing of concentration function result, the sequencing that the flame concentration numerical value is less is back, the sequencing that the flame concentration numerical value is placed in the middle is preceding, the ranking that the numerical value is the same is not in proper order, and the symmetric distribution obtains the combustor operation order of setting for respectively X group (B, A, D) and Y group (E, F, C) from this.
In order to ensure that the temperature of the pipe wall is uniform, the step of sequentially taking out the coal mill in the embodiment by adopting a symmetrical input mode comprises the following steps of:
2.1) initializing the current commissioning sequence L to be null;
2.2) if the X group is not empty, taking one coal mill out of the X group, adding the coal mill into the current commissioning sequence L, and skipping to execute the next step; otherwise, judging that the current commissioning sequence L is obtained completely, taking the current commissioning sequence L as the obtained current commissioning sequence, and returning;
2.3) if the Y group is empty, judging that the current commissioning sequence L is obtained completely, taking the current commissioning sequence L as the obtained current commissioning sequence, and returning; otherwise, the coal mills taken out from the X group at the last time are searched from the Y group and step 2.2) and are symmetrically distributed front and back or left and right relative to the central line of the boiler, if the search is successful, the coal mills are added into the current operation sequence L, k is added by 1, and the step 2.2) is executed by jumping; if the search is unsuccessful, skipping to execute the next step;
2.4) judging whether the number of the coal mills added into the current operation sequence L in the X group and the number of the coal mills added into the current operation sequence L in the Y group is more than or equal to 2 (which can be expressed as | X-Y | > or more than or equal to 2) or not, if yes, taking out a coal mill from the Y group and adding the coal mill into the current operation sequence L, wherein the coal mill has the smallest difference value with the flame concentration or the pipe wall temperature deviation coefficient K of the coal mill taken out from the X group at the last time in the step 2.2), adding 1 to K, and jumping to execute the step 2.2); otherwise, the coal mill is not taken out from the Y group randomly in the current round, k is directly added with 1, and the step 2.2) is executed. By the method, the operation condition that the | X-Y | is not larger than or equal to 2 cannot be generated in the coal mill assembly during the startup of the boiler, and the heat load can be ensured to be symmetrically distributed around the central line of the boiler and on the left and right.
In the step 3) of the embodiment, when a coal mill operation test is carried out under common coal quality based on the current operation sequence, pipe wall temperature measuring points T (j) are arranged along the width direction of a hearth, and j is the serial number of the pipe wall temperature measuring points; and carrying out a coal mill commissioning test under the condition of common coal according to the current commissioning sequence, and recording the wall temperature of the specified pipe wall temperature measuring point of the W-shaped flame boiler, so that a wall temperature distribution curve under the current commissioning sequence can be obtained, and a pipe wall temperature deviation coefficient K is calculated. The W-shaped flame boiler is provided with wall temperature measuring points such as a water wall, a superheater and a reheater, the arrangement of the wall temperature measuring points can be combined with the specific situation of a site, the wall temperature measuring points can be arranged at intervals or continuously, and the arrangement type is not limited. In addition, the pipe wall temperature measuring points can also be collected in a DCS or SIS system and the like. The method comprises the steps of carrying out tests on different operation sequences and combination modes of the coal mills in groups under the condition of common coal quality of the boiler, wherein the operation can be carried out according to the sequence set by a concentration function, and can also be carried out in turn according to experience, obtaining pipe wall temperature data and distribution under each group of tests, obtaining wall temperature sensitivity of the boiler under different operation modes and combinations of the coal mills through a plurality of groups of tests, and obtaining the priority of the coal mills.
It should be noted that the pipe wall temperature deviation coefficient K represents the deviation of the pipe wall temperature, and the smaller the pipe wall temperature deviation coefficient K is, the smaller the pipe wall temperature uniformity is. The deviation of the tube wall temperature may be the average deviation between the tube wall temperature and the average value of the wall temperatures of n tube wall temperature measurement points in the current commissioning sequence, or the deviation between the maximum value and the minimum value of the wall temperatures of the n tube wall temperature measurement points, or the deviation or the standard deviation and the variation form thereof, and the like, and a person skilled in the art can adopt a required calculation mode as required.
For example, as an alternative embodiment, the functional expression for calculating the pipe wall temperature deviation coefficient K in step 3) is:
in the above formula, n is the number of the temperature measuring points of the pipe wall, TjRepresents the wall temperature of the jth pipe wall temperature measuring point in the current commissioning sequence,
and (4) representing the average value of the wall temperature of n pipe wall temperature measuring points in the current commissioning sequence.
For example, as another alternative embodiment, the functional expression of the coefficient K of deviation of the temperature of the pipe wall calculated in step 3) is:
in the above formula, n is the number of the temperature measuring points of the pipe wall, TjRepresents the wall temperature of the jth pipe wall temperature measuring point in the current commissioning sequence,
and (4) representing the average value of the wall temperature of n pipe wall temperature measuring points in the current commissioning sequence.
For example, as another alternative embodiment, the functional expression of the coefficient K of deviation of the temperature of the pipe wall calculated in step 3) is:
in the above formula, n is the number of the tube wall temperature measuring points, TjRepresents the wall temperature of the jth pipe wall temperature measuring point in the current commissioning sequence,
and (4) representing the average value of the wall temperature of n pipe wall temperature measuring points in the current commissioning sequence.
It is needless to say that the above functional expression for calculating the pipe wall temperature deviation coefficient K is only an example based on the deviation of the pipe wall temperature, and is not exhaustive, and those skilled in the art may make further variations on this basis, and may also express the deviation of the pipe wall temperature to different degrees, and details thereof are not repeated herein.
In this embodiment, the pipe wall temperature deviation coefficient K is used as an influence factor, and the coal mill combinations are sorted again according to the magnitude of the influence factor on the wall temperature, so that the priority order of the coal mills is E, B, F, A, D, C, and the result chart 1 is obtained.
Table 1: a priority order table.
Referring to table 1, E, F, D coal mills correspond to the priority of X (1), X (2), X (3), and B, A, C coal mills correspond to the priority of Y (1), Y (2), Y (3). X priority is greater than Y, priority order (1) > (2) > (3). And putting the powder into the pulverizing system according to the priority order during the startup of the boiler. When the coal mill with the front priority cannot be put into operation due to reasons, the operator can put the coal mill into a maintenance position and start the coal mill with the next priority when the load needs to be added.
And 5) determining the operation priority of the coal mill according to the operation sequence with the minimum pipe wall temperature deviation coefficient K, and further performing optimization adjustment on the burners and secondary air distribution after the burners in the corresponding coal mill are operated according to the operation priority.
In the embodiment, the step 5) is followed by a step of stopping the burners in the corresponding coal mills according to the reverse order of the operation priority when the coal mills are stopped, so that the temperature uniformity of the tube wall can be further ensured when the coal mills are stopped, the temperature deviation of the wall and the steam can be reduced, and the risks of tube explosion and tube breakage of the water-cooled wall can be reduced.
The method of the embodiment can be implemented in the debugging period of the unit starting or the cold-state starting process of the unit. According to the method for optimizing and controlling the temperature uniformity of the tube wall in the starting stage of the W-shaped flame boiler, the commissioning priority of the powder making system is obtained according to the characteristics of the boiler and the powder making system, the operation mode of the powder making system is standardized and unified, the wall temperature deviation of the heating surface is reduced, and the operation safety of the water-cooled wall and the heating surface of the boiler is improved. According to the optimization control method for the pipe wall temperature uniformity of the W-shaped flame boiler in the starting stage, the wall temperature deviation of the W-shaped flame boiler can be controlled from the source of commissioning of a pulverizing system, so that the uniformity of the heat load of a hearth and the fullness of the hearth are effectively guaranteed, and beneficial help is provided for the optimization adjustment of the pipe wall temperature of the W-shaped flame boiler.
In addition, the embodiment also provides a system for controlling the pipe wall temperature uniformity optimization in the start-up stage of the W-shaped flame boiler, which includes a microprocessor and a memory, wherein the microprocessor is programmed or configured to execute the steps of the method for controlling the pipe wall temperature uniformity optimization in the start-up stage of the W-shaped flame boiler, or the memory stores a computer program programmed or configured to execute the method for controlling the pipe wall temperature uniformity optimization in the start-up stage of the W-shaped flame boiler.
In addition, the present embodiment also provides a computer readable storage medium, in which a computer program is stored, wherein the computer program is programmed or configured to execute the pipe wall temperature uniformity optimization control method in the start-up stage of the W-shaped flame boiler.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiments, and all technical solutions that belong to the idea of the present invention belong to the scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. A method for optimizing and controlling the temperature uniformity of a tube wall in the starting stage of a W-shaped flame boiler is characterized by comprising the following steps:
1) determining the flame concentration of each coal mill in the W-shaped flame boiler;
2) sorting the coal mills according to the flame concentration ratio, dividing the coal mills into a large grade, a medium grade and a small grade, and combining the three grades according to the medium grade, the large grade and the small grade to obtain the current operation sequence of the coal mills;
3) carrying out a coal mill commissioning test under the condition of common coal quality based on the current commissioning sequence, recording the wall temperature of a designated pipe wall temperature measuring point of the W-shaped flame boiler, obtaining a wall temperature distribution curve under the current commissioning sequence and calculating a pipe wall temperature deviation coefficient K;
4) judging whether the commissioning test frequency reaches a preset threshold value, and if so, skipping to execute the step 5); otherwise, sorting the coal mill according to the pipe wall temperature deviation coefficient K, dividing the coal mill into a large grade, a medium grade and a small grade, combining the three grades according to the medium, large and small modes to obtain the current operation sequence of the coal mill, and skipping to execute the step 3);
5) and determining the operation priority of the coal mill according to the operation sequence with the minimum pipe wall temperature deviation coefficient K, and operating the burners in the corresponding coal mill according to the operation priority.
2. The optimization control method for the pipe wall temperature uniformity in the starting stage of the W-shaped flame boiler as claimed in claim 1, wherein the calculation function expression of the flame concentration in the step 1) is as follows:
in the above formula, f (i) represents the flame concentration of the i-th coal mill, SjAnd the distance from the coordinates of the jth burner in the ith coal mill to the origin is represented, wherein the origin refers to the central point of the hearth, and m is the number of the burners contained in the ith coal mill.
3. The method for optimally controlling the pipe wall temperature uniformity in the start-up stage of the W-shaped flame boiler according to claim 1, wherein the step of combining the three grades according to a medium, large and small mode to obtain the current operation sequence of the coal mill comprises the following steps of: combining the three grades according to a medium-sized mode, a large-sized mode and a small-sized mode to obtain a current coal mill list, alternately distributing the coal mills in the current coal mill list to X, Y two groups, and then sequentially taking out the coal mills in a symmetrical input mode in the X, Y two groups to obtain the current operation sequence of the coal mills.
4. The method for optimally controlling the temperature uniformity of the tube wall in the starting stage of the W-shaped flame boiler according to claim 3, wherein the step of sequentially taking out the coal mills in a symmetrical input mode comprises the following steps of:
2.1) initializing the current commissioning sequence L to be null;
2.2) if the X group is not empty, taking out a coal mill from the X group, adding the coal mill into the current operation sequence L, and skipping to execute the next step; otherwise, judging that the current commissioning sequence L is obtained completely, taking the current commissioning sequence L as the obtained current commissioning sequence, and returning;
2.3) if the Y group is empty, judging that the current commissioning sequence L is obtained completely, taking the current commissioning sequence L as the obtained current commissioning sequence, and returning; otherwise, searching coal mills taken out from the X group from the Y group and step 2.2) for the last time, wherein the coal mills are distributed in a front-back or left-right symmetrical mode relative to the central line of the boiler, if the coal mills are successfully searched, adding the coal mills into the current operation sequence L, adding k to 1, and skipping to execute the step 2.2); if the search is not successful, skipping to execute the next step;
2.4) judging whether the number of coal mills added into the current operation sequence L in the X group and the number of coal mills added into the current operation sequence L in the Y group is more than or equal to 2, if yes, taking out one coal mill from the Y group which has the smallest difference with the flame concentration or the pipe wall temperature deviation coefficient K of the coal mill taken out from the X group at the last time in the step 2.2) and adding the coal mill into the current operation sequence L, adding 1 to K, and jumping to execute the step 2.2); otherwise, the coal mill is not taken out from the Y group randomly in the current round, k is directly added with 1, and the step 2.2) is executed.
5. The method for optimizing and controlling the temperature uniformity of the tube wall in the starting stage of the W-shaped flame boiler according to claim 1, wherein the function expression for calculating the temperature deviation coefficient K of the tube wall in the step 3) is as follows:
in the above formula, n is the number of the temperature measuring points of the pipe wall, TjRepresents the wall temperature of the jth pipe wall temperature measuring point in the current commissioning sequence,
and (4) representing the average value of the wall temperature of n pipe wall temperature measuring points in the current commissioning sequence.
6. The method for optimizing and controlling the temperature uniformity of the tube wall in the starting stage of the W-shaped flame boiler according to claim 1, wherein the function expression for calculating the temperature deviation coefficient K of the tube wall in the step 3) is as follows:
in the above formula, n is the number of the tube wall temperature measuring points, TjRepresents the wall temperature of the jth pipe wall temperature measuring point in the current commissioning sequence,
and (4) representing the average value of the wall temperature of n pipe wall temperature measuring points in the current commissioning sequence.
7. The method for optimizing and controlling the temperature uniformity of the tube wall in the starting stage of the W-shaped flame boiler according to claim 1, wherein the function expression for calculating the temperature deviation coefficient K of the tube wall in the step 3) is as follows:
in the above formula, n is the number of the temperature measuring points of the pipe wall, TjRepresents the wall temperature of the jth pipe wall temperature measuring point in the current commissioning sequence,
and (4) representing the average value of the wall temperature of n pipe wall temperature measuring points in the current commissioning sequence.
8. The method for controlling the pipe wall temperature uniformity in the start-up phase of a W-shaped flame boiler according to claim 1, wherein the step 5) is followed by a step of shutting down burners in corresponding coal mills in reverse order of the operation priority when the coal mills are shut down.
9. A W-type flame boiler start-up phase pipe wall temperature uniformity optimization control system comprises a microprocessor and a memory, and is characterized in that the microprocessor is programmed or configured to execute the steps of the W-type flame boiler start-up phase pipe wall temperature uniformity optimization control method according to any one of claims 1-8, or the memory stores a computer program programmed or configured to execute the W-type flame boiler start-up phase pipe wall temperature uniformity optimization control method according to any one of claims 1-8.
10. A computer-readable storage medium, wherein the computer-readable storage medium stores a computer program programmed or configured to execute the method for optimal control of tube wall temperature uniformity during start-up of a W-type flame boiler as claimed in any one of claims 1 to 8.
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