A control device for improving the primary and secondary air temperature of a boiler

Abstract

The present application relates to the technical field of improving the primary and secondary air temperature of boiler combustion, and more particularly to a control device for improving the primary and secondary air temperature of boiler combustion, comprising: a temperature raising module for raising the temperature of flue gas in a flue gas pipeline and hot air heated by an air preheater; a detection module for detecting the temperature of hot air heated by the air preheater and the temperature of hot air after temperature raising; and a control module for adjusting the efficiency of the temperature raising module according to the detected temperature to realize temperature raising control of the primary and secondary air temperature of the boiler. The primary and secondary air temperature is raised by using the waste heat of flue gas, the drying output of the primary air is enhanced, the outlet temperature of the coal mill is raised, and the blending capacity of low-quality coal with high moisture content is enhanced. The specific energy consumption of the coal pulverizing system is reduced, especially under the blending combustion of low-quality coal. The blocking of the coal pulverizing system is reduced, and the operation safety of the coal pulverizing system is improved. The secondary air temperature is raised, the combustion temperature under the blending combustion of low-quality coal is raised, the combustion speed is enhanced, and the safety and economy of boiler combustion are enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of improving the primary and secondary air temperature of boiler combustion, and more particularly to a control device for improving the primary and secondary air temperature of boiler combustion. BACKGROUND

[0002] In the combustion of thermal power plants, the primary and secondary air temperature plays a very important role. In the current power generation of thermal power plants, due to the high cost of coal, low-quality coal is mixed and burned.

[0003] In the prior art, due to the mixing and burning of low-quality coal with high moisture and low calorific value, the outlet temperature of the coal mill is too low, and the heated primary air sent to the pulverizing system cannot meet the needs; the temperature of the air-powder mixture entering the furnace is low, which delays the combustion time of the boiler and reduces the safety and economy of the boiler combustion.

[0004] Therefore, how to effectively improve the temperature of the primary and secondary air is a problem that needs to be solved by those skilled in the art. SUMMARY

[0005] Therefore, the present application provides a control device for improving the primary and secondary air temperature of boiler combustion, which utilizes the waste heat of the flue gas in the flue gas pipeline to heat the hot air, improves the utilization efficiency of the waste heat of the flue gas, and effectively heats the primary and secondary air.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0007] Preferably, the control device for improving the primary and secondary air temperature of boiler combustion comprises:

[0008] The air preheater generates hot air using the flue gas from the economizer flue gas pipeline, and the hot air is divided into primary and secondary air through the hot air pipeline and then enters the boiler for combustion;

[0009] The heating module obtains the flue gas of the flue gas pipeline and heats the hot air heated by the air preheater;

[0010] The detection module detects the temperature of the hot air heated by the air preheater and the temperature of the heated hot air;

[0011] The control module adjusts the efficiency of the heating module according to the detected temperature to control the heating of the primary and secondary air of the boiler.

[0012] Preferably, in the control device for improving the primary and secondary air temperature of boiler combustion, the heating module comprises a heating pipeline, an induced draft fan, a heating valve, a heating adjusting door, and a heat exchanger.

[0013] The heating pipeline is connected to the flue gas pipeline at both ends, and the connection points are located behind the air preheater.

[0014] The heat exchanger is connected with the hot air pipeline and the temperature rising pipeline, and uses the flue gas waste heat in the temperature rising pipeline to rise the temperature of the hot air in the hot air pipeline.

[0015] The induced draft fan, the temperature rising valve and the temperature rising adjusting door are sequentially arranged on the temperature rising pipeline and located at the inlet side of the heat exchanger.

[0016] Preferably, in the control device for rising the primary air temperature and the secondary air temperature of the boiler, the detection module comprises:

[0017] The first temperature sensor is arranged on the hot air pipeline and located in front of the inlet of the heat exchanger.

[0018] The second temperature sensor is arranged on the hot air pipeline and located behind the outlet of the heat exchanger.

[0019] The third temperature sensor is arranged on the flue gas pipeline and located between the inlet of the temperature rising pipeline and the air preheater.

[0020] Preferably, in the control device for rising the primary air temperature and the secondary air temperature of the boiler, the control module comprises:

[0021] The opening adjusting unit adjusts the opening of the temperature rising adjusting door according to the detected temperature information.

[0022] The power adjusting unit adjusts the power of the induced draft fan according to the load information of the steam turbine unit.

[0023] Preferably, in the control device for rising the primary air temperature and the secondary air temperature of the boiler, the opening adjusting unit comprises:

[0024] The first acquisition unit acquires the data information of the first temperature sensor, the second temperature sensor and the third temperature sensor, and extracts the first temperature data, the second temperature data and the third temperature data detected in a preset time period.

[0025] The calculation unit analyzes and calculates the first temperature data, the second temperature data and the third temperature data to obtain the first effective value, the second effective value and the third effective value respectively, and obtains the first temperature difference value according to the second effective value and the third effective value.

[0026] The adjusting unit obtains the second temperature difference value according to the second effective value and a preset temperature threshold value, determines the opening of the temperature rising adjusting door according to the size of the second temperature difference value, and corrects the opening of the current temperature rising adjusting door according to the size of the first temperature difference value.

[0027] Preferably, in the control device for improving the primary air and secondary air temperature of a boiler, the first effective value is calculated according to the first temperature data, and the calculation comprises:

[0028] The temperature values in the first temperature data are sorted according to the size to obtain a median value of the first temperature data;

[0029] All data after sorting the first temperature data is equally divided into ten parts, and the values at the two parts where the median value is larger are taken as the upper values, and the values at the two parts where the median value is smaller are taken as the lower values;

[0030] The upper limit value and the lower limit value are calculated through the upper values and the lower values, and the calculation formula of the upper limit value and the lower limit value is Q3=Q1+1.5*(Q1-Q2), Q4=Q2-1.5*(Q1-Q2); wherein Q1 is the upper value, Q2 is the lower value, Q3 is the upper limit value, and Q4 is the lower limit value; the data greater than the upper limit value or smaller than the lower limit value in the first temperature data is removed to obtain an effective value set; and the effective value of the effective data set is calculated, and the calculation formula is:

[0031]

[0032] Wherein, c is the first effective value, n is the number of data in the effective data set, and ci is each data in the effective data set.

[0033] Preferably, in the control device for improving the primary air and secondary air temperature of a boiler, the opening degree of the temperature adjusting door is determined according to the size of the second temperature difference value, and the determination comprises:

[0034] In the adjusting unit, when the opening degree of the temperature adjusting door is determined according to the second temperature difference value A, the determination comprises:

[0035] The adjusting unit is provided with a preset blanking speed matrix A0, and A0(A1, A2, A3, A4) is set, wherein A1 is a first preset second temperature difference value, A2 is a second preset second temperature difference value, A3 is a third preset second temperature difference value, and A4 is a fourth preset second temperature difference value, and A1

[0036] The adjusting unit is used for presetting the opening degree matrix B0 of the temperature adjusting door, and B0(B1, B2, B3, B4) is set, wherein B1 is a first preset opening degree of the temperature adjusting door, B2 is a second preset opening degree of the temperature adjusting door, B3 is a third preset opening degree of the temperature adjusting door, and B4 is a fourth preset opening degree of the temperature adjusting door, and B1

[0037] The adjusting unit is further configured to set the opening degree B of the temperature-increasing adjusting door according to a relationship between the second temperature difference A and each preset second temperature difference;

[0038] When A

[0039] When A1≤A

[0040] When A2≤A

[0041] When A3≤A

[0042] Preferably, in the control device for increasing the primary air temperature and the secondary air temperature of the boiler, the opening degree of the temperature-increasing adjusting door is corrected according to the first temperature difference, and the control device comprises:

[0043] The adjusting unit corrects the opening degree B of the temperature-increasing adjusting door according to the first temperature difference C,

[0044] The adjusting unit presets a difference matrix C0, and sets C0(C1, C2, C3, C4), wherein C1 is a first preset difference, C2 is a second preset difference, C3 is a third preset difference, and C4 is a fourth preset difference, and C1>C2>C3>C4;

[0045] The adjusting unit presets a correction coefficient matrix D0 for correcting the opening degree B of the temperature-increasing adjusting door, and sets D0(D1, D2, D3), wherein D1 is a first preset correction coefficient, D2 is a second preset correction coefficient, and D3 is a third preset correction coefficient, and 1

[0046] The adjusting unit determines the correction coefficient of the opening degree B of the temperature-increasing adjusting door according to a relationship between the difference C and each data of the preset difference matrix C0, and corrects the current adjusting speed B:

[0047] When C

[0048] When C1≤C

[0049] When C2≤C

[0050] When C3≤C

[0051] Compared with the prior art, the beneficial effects of the present application are:

[0052] 1. The primary air drying capacity is enhanced by using the flue gas waste heat to increase the temperature of the primary and secondary air, the temperature of the coal mill outlet is increased, the capacity of mixing low-quality coal is enhanced, the power consumption of the coal pulverizing system is reduced, especially when mixing low-quality coal, the coal pulverizing system is less likely to be blocked, the operation safety of the coal pulverizing system is improved, the secondary air temperature is increased, the combustion temperature when mixing low-quality coal is increased, the combustion speed is enhanced, and the safety and economy of the boiler combustion are improved.

[0053] 2. The flue gas waste heat is further used to reduce the heat loss of the flue gas, and the efficiency of the boiler is improved. BRIEF DESCRIPTION OF DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0055] Figure 1 The accompanying drawings are schematic structural diagrams of the present application.

[0056] In the drawings, 1 is a flue gas pipeline, 2 is a hot air pipeline, 3 is a temperature increasing pipeline, 4 is an induced draft fan, 5 is a temperature increasing valve, 6 is a temperature increasing adjusting door, 7 is a heat exchanger, 8 is a first temperature sensor, 9 is a second temperature sensor, and 10 is a third temperature sensor. DETAILED DESCRIPTION

[0057] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described in the description of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of the present application. With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described in the description of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of the present application.

[0058] In the present application, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance; the term "multiple" refers to two or more, unless otherwise explicitly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, "connecting" can be fixed connection, or detachable connection, or integrally connected; "connected" can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0059] In the description of the present application, it should be understood that the terms "up", "down", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or units referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0060] In the description of the present application, the terms "one embodiment", "some embodiments", "a specific embodiment" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0061] Embodiment 1

[0062] As Figure 1 shown, the embodiment of the present application discloses a control device for improving the primary and secondary air temperature of a boiler, comprising:

[0063] The air preheater generates hot air by using flue gas from the coal economizer flue gas pipeline 1, and the hot air is divided into primary air and secondary air by the hot air pipeline 2 and then enters the boiler for combustion.

[0064] The temperature increasing module obtains flue gas from the flue gas pipeline 1 and increases the temperature of the hot air heated by the air preheater.

[0065] The detection module detects the temperature of the hot air heated by the air preheater and the temperature of the hot air after temperature increasing.

[0066] The control module adjusts the efficiency of the temperature increasing module according to the detected temperature, so as to control the temperature increasing of the primary air and the secondary air of the boiler.

[0067] In the above embodiment, the control module is a DCS system in the thermal power plant, which is connected to and controls each device in the embodiment.

[0068] The above embodiment has the following beneficial effects: the primary air and the secondary air are heated by using flue gas waste heat, the drying capacity of the primary air is enhanced, the outlet temperature of the coal mill is increased, and the mixing capacity of the low-quality coal with high moisture is enhanced; the unit consumption of the coal pulverizing system is reduced, especially the unit consumption under the mixing combustion of the low-quality coal; the blocking of the coal pulverizing system is reduced, and the operation safety of the coal pulverizing system is improved; the secondary air temperature is increased, the combustion temperature under the mixing combustion of the low-quality coal is increased, the combustion speed is increased, and the safety and economy of the boiler combustion are improved.

[0069] Embodiment 2

[0070] In one embodiment, a control device for increasing the temperature of primary air and secondary air of a boiler includes a temperature increasing module, which includes: a temperature increasing pipeline 3, an induced draft fan 4, a temperature increasing valve 5, a temperature increasing adjusting door 6, and a heat exchanger 7.

[0071] The temperature increasing pipeline 3 is connected to the flue gas pipeline 1 at both ends, and the connection points are located at the rear of the air preheater.

[0072] The heat exchanger 7 is connected to the hot air pipeline 2 and the temperature increasing pipeline 3, and uses the flue gas waste heat in the temperature increasing pipeline 3 to increase the temperature of the hot air in the hot air pipeline 2.

[0073] The induced draft fan 4, the temperature increasing valve 5, and the temperature increasing adjusting door 6 are sequentially arranged on the temperature increasing pipeline 3 and located on the inlet side of the heat exchanger 7.

[0074] In the above embodiment, the induced draft fan 4, the heat exchanger 7, the temperature increasing valve 5, and the temperature increasing adjusting door 6 are all prior art; the temperature increasing valve 5 controls whether the temperature increasing pipeline 3 is used; and the temperature increasing adjusting door 6 controls the flue gas flow entering the heat exchanger 7 by controlling the opening degree.

[0075] Embodiment 3

[0076] In one embodiment, a control device for improving the primary and secondary air temperature of a boiler, a detection module comprises:

[0077] A first temperature sensor 8 is arranged on the hot air duct 2 and located in front of the inlet of the heat exchanger 7.

[0078] A second temperature sensor 9 is arranged on the hot air duct 2 and located behind the outlet of the heat exchanger 7.

[0079] A third temperature sensor 10 is arranged on the flue gas duct 1 and located between the inlet of the temperature rising duct 3 and the air preheater.

[0080] A control module comprises:

[0081] An opening adjusting unit adjusts the opening of the temperature rising adjusting door 6 according to the detected temperature information.

[0082] A power adjusting unit adjusts the power of the induced draft fan 4 according to the load information of the steam turbine unit.

[0083] The above-mentioned adjustment of the power of the induced draft fan 4 needs to be explained that the greater the load of the steam turbine unit, the greater the air volume of the primary and secondary air, and the greater the flue gas flow rate, which requires the adjustment of the induced draft fan 4 to match and keep the temperature rising effect of the primary and secondary air stable.

[0084] The opening adjusting unit comprises:

[0085] A first acquisition unit acquires the data information of the first temperature sensor 8, the second temperature sensor 9 and the third temperature sensor 10, and extracts the first temperature data, the second temperature data and the third temperature data detected in a preset time period.

[0086] A calculation unit analyzes and calculates the first temperature data, the second temperature data and the third temperature data to obtain the first effective value, the second effective value and the third effective value, respectively, and obtains the first temperature difference value according to the second effective value and the third effective value.

[0087] A regulating unit obtains the second temperature difference value according to the second effective value and a preset temperature threshold value, determines the opening of the temperature rising adjusting door 6 according to the size of the second temperature difference value, and corrects the opening of the current temperature rising adjusting door 6 according to the size of the first temperature difference value.

[0088] In the above embodiment, the preset time period is the adjustment period of the device, and the temperature is calculated in each time period and the opening of the temperature rising adjusting door 6 is adjusted.

[0089] In the above embodiment, the opening of the temperature rising adjusting door 6 is adjusted according to the temperature of the flue gas and the hot air, which reduces the occurrence of excessively high or low hot air temperature and improves the stability of the system operation.

[0090] Embodiment 4

[0091] The first effective value is calculated according to the first temperature data analysis, including:

[0092] The temperature values in the first temperature data are sorted according to the size to obtain the median value of the first temperature data;

[0093] All data after sorting of the first temperature data is equally divided into ten parts, and the values at the two parts with the largest median values are taken as the upper values, and the values at the two parts with the smallest median values are taken as the lower values;

[0094] The upper limit value and the lower limit value are calculated through the upper values and the lower values, and the calculation formula of the upper limit value and the lower limit value is: Q3=Q1+1.5*Q1-Q2, Q4=Q2-1.5*Q1-Q2; wherein Q1 is the upper value, Q2 is the lower value, Q3 is the upper limit value, and Q4 is the lower limit value; the data greater than the upper limit value or less than the lower limit value in the first temperature data is removed to obtain the effective value set; and the effective value of the effective data set is calculated, and the calculation formula is:

[0095]

[0096] Wherein, c is the first effective value, n is the number of data in the effective data set, and ci is each data in the effective data set.

[0097] In the above embodiment, by using the method of removing extreme values and calculating effective values, the influence of extreme data on data is avoided, and the stability of calculation is improved.

[0098] Embodiment 5

[0099] In one embodiment, a control device for improving the primary and secondary air temperature of a boiler, the opening degree of the temperature rising adjusting door 6 is determined according to the size of the second temperature difference value, including:

[0100] In the adjusting unit, when the opening degree of the temperature rising adjusting door 6 is determined according to the second temperature difference value A, including:

[0101] The adjusting unit presets a falling speed matrix A0, sets A0A1, A2, A3, A4, wherein A1 is the first preset second temperature difference value, A2 is the second preset second temperature difference value, A3 is the third preset second temperature difference value, and A4 is the fourth preset second temperature difference value, and A1

[0102] The adjusting unit is used for presetting an opening degree matrix B0 of the temperature increasing adjusting door 6, setting B0B1, B2, B3, B4, wherein B1 is the opening degree of the first preset temperature increasing adjusting door 6, B2 is the opening degree of the second preset temperature increasing adjusting door 6, B3 is the opening degree of the third preset temperature increasing adjusting door 6, B4 is the opening degree of the fourth preset temperature increasing adjusting door 6, and B1

[0103] The adjusting unit is also used for setting the opening degree B of the temperature increasing adjusting door 6 according to the relationship between the second temperature difference A and each preset second temperature difference:

[0104] When A

[0105] When A1≤A

[0106] When A2≤A

[0107] When A3≤A

[0108] According to the size of the first temperature difference, the opening degree of the current temperature increasing adjusting door 6 is corrected, including:

[0109] The adjusting unit corrects the opening degree B of the temperature increasing adjusting door 6 according to the size of the first temperature difference C,

[0110] The adjusting unit presets a difference matrix C0, sets C0C1, C2, C3, C4, wherein C1 is the first preset difference, C2 is the second preset difference, C3 is the third preset difference, C4 is the fourth preset difference, and C1>C2>C3>C4;

[0111] The adjusting unit presets a correction coefficient matrix D0 for correcting the opening degree B of the temperature increasing adjusting door 6, sets D0D1, D2, D3, wherein D1 is the first preset adjusting coefficient, D2 is the second preset adjusting coefficient, D3 is the third preset adjusting coefficient, and 1

[0112] The adjusting unit determines the correction coefficient of the opening degree B of the temperature increasing adjusting door 6 according to the relationship between the size of the difference C and each data of the preset difference matrix C0, and corrects the current adjusting speed B:

[0113] When C

[0114] When C1≤C<C2, the first preset adjustment coefficient D1 is selected to correct the opening B of the temperature adjustment door 6, and the corrected opening is B*D1;

[0115] When C2≤C<C3, the second preset adjustment coefficient D2 is selected to correct the opening B of the temperature adjustment door 6, and the corrected opening is B*D2;

[0116] When C3≤C<C4, the third preset adjustment coefficient D3 is selected to correct the opening B of the temperature adjustment door 6, and the corrected opening is B*D3.

[0117] According to the above embodiment, it should be noted that the induced draft fan 4 sucks the flue gas into the temperature rising pipeline, because the flue gas is a gas, and it is not easy to control the flow through the induced draft fan 4. By setting the opening of the temperature adjustment door 6, the flow of the flue gas in the temperature rising pipeline 3 is controlled, and the stability of the primary air and secondary air temperature rising is improved.

[0118] It should be noted that the above embodiment is only used as an example to illustrate the division of the above functional modules. In actual application, the above functions can be completed by different functional modules according to needs, that is, the modules or steps in the embodiment of the present application are further decomposed or combined, for example, the modules of the above embodiment can be combined into one module, or can be further split into multiple sub-modules to complete all or part of the functions described above. The names of the modules and steps involved in the embodiments of the present application are only for distinguishing the modules and steps, and should not be considered as an improper limitation of the present application.

[0119] The term "comprising" or any other similar word is intended to cover non-exclusive inclusion, so that the process, method, article or equipment / device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes the elements inherent to the process, method, article or equipment / device.

[0120] So far, the technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to related technical features without departing from the principles of the present application, and the technical solutions after the changes or replacements will fall within the protection scope of the present application.

[0121] It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application cover modifications and variations of this application provided they come within the scope of the appended claims and their equivalents. The above description discloses only preferred embodiments of the application and does not limit the scope of the application. The application is susceptible to modifications in the component parts used, and in the details of the construction and operation, and the scope of the overall application; therefore, various modifications as will be obvious to those skilled in the art are intended to be included within the scope of the present application.

Claims

1. A control device for raising the primary and secondary air temperature of a boiler, characterized by, The application relates to a boiler temperature control system. The boiler temperature control system comprises the following parts: A preheater uses flue gas from a coal economizer flue gas pipeline (1) to generate hot air, the hot air is divided into primary air and secondary air through a hot air pipeline (2), and then the hot air enters a boiler for combustion; A temperature rising module obtains flue gas from the flue gas pipeline (1) and heats the hot air after the preheater; A detection module detects the temperature of the hot air after the preheater and the temperature of the hot air after temperature rising; A control module adjusts the efficiency of the temperature rising module according to the detected temperature, so as to realize temperature rising control of the primary air and the secondary air of the boiler; The temperature rising module comprises a temperature rising pipeline (3), an induced draft fan (4), a temperature rising valve (5), a temperature rising adjusting door (6) and a heat exchanger (7); The temperature rising pipeline (3) is connected with the flue gas pipeline (1) at both ends, and the connection points are located behind the preheater; The heat exchanger (7) is connected with the hot air pipeline (2) and the temperature rising pipeline (3), and the flue gas waste heat in the temperature rising pipeline (3) is used to heat the hot air in the hot air pipeline (2); The induced draft fan (4), the temperature rising valve (5) and the temperature rising adjusting door (6) are sequentially arranged on the temperature rising pipeline (3) and located on the inlet side of the heat exchanger (7); The detection module comprises: A first temperature sensor (8) is arranged on the hot air pipeline (2) and located in front of the inlet of the heat exchanger (7); A second temperature sensor (9) is arranged on the hot air pipeline (2) and located behind the outlet of the heat exchanger (7); A third temperature sensor (10) is arranged on the flue gas pipeline (1) and located between the inlet of the temperature rising pipeline (3) and the preheater; The control module comprises: An opening adjusting unit adjusts the opening of the temperature rising adjusting door (6) according to the detected temperature information; A power adjusting unit adjusts the power of the induced draft fan (4) according to the load information of a steam turbine unit; The opening adjusting unit comprises: A first acquisition unit acquires data information of the first temperature sensor (8), the second temperature sensor (9) and the third temperature sensor (10), extracts first temperature data, second temperature data and third temperature data detected in a preset time period, and analyzes and calculates the first temperature data, the second temperature data and the third temperature data to obtain a first effective value, a second effective value and a third effective value respectively, and obtains a first temperature difference value according to the second effective value and the third effective value; An adjusting unit obtains a second temperature difference value according to the second effective value and a preset temperature threshold value, determines the opening of the temperature rising adjusting door (6) according to the size of the second temperature difference value, and corrects the opening of the temperature rising adjusting door (6) according to the size of the first temperature difference value; The first effective value is obtained by analyzing and calculating the first temperature data, and the method comprises the following steps: The temperature values in the first temperature data are sorted according to the size to obtain a median value of the first temperature data. The sorted first temperature data is equally divided into ten parts, and the upper limit value is obtained by taking the value at the position of the upper two parts of the median value, and the lower limit value is obtained by taking the value at the position of the lower two parts of the median value; The upper limit value and the lower limit value are calculated by the upper limit value and the lower limit value, and the calculation formula of the upper limit value and the lower limit value is: Q3=Q1+1.5*(Q1-Q2), Q4=Q2-1.5*(Q1-Q2); wherein Q1 is the upper limit value, Q2 is the lower limit value, Q3 is the upper limit value, and Q4 is the lower limit value; the data greater than the upper limit value or less than the lower limit value in the first temperature data is removed to obtain the effective value set; and the effective value of the effective data set is calculated, and the calculation formula is: Wherein, c is the first effective value, n is the number of data in the effective data set, and ci is each data in the effective data set.

2. The control device for raising the primary and secondary air temperature of a boiler according to claim 1, characterized by According to the size of the second temperature difference value, the opening degree of the temperature adjustment door (6) is determined, including: In the adjustment unit, when the opening degree of the temperature adjustment door (6) is determined according to the second temperature difference value A, including: The adjustment unit presets the blanking speed matrix A0, sets A0(A1, A2, A3, A4), wherein A1 is the first preset second temperature difference value, A2 is the second preset second temperature difference value, A3 is the third preset second temperature difference value, and A4 is the fourth preset second temperature difference value, and A1 The adjustment unit is used for presetting the opening degree matrix B0 of the temperature adjustment door (6), and setting B0(B1, B2, B3, B4), wherein B1 is the first preset opening degree of the temperature adjustment door (6), B2 is the second preset opening degree of the temperature adjustment door (6), B3 is the third preset opening degree of the temperature adjustment door (6), and B4 is the fourth preset opening degree of the temperature adjustment door (6), and B1 The adjustment unit is also used for setting the opening degree B of the temperature adjustment door (6) according to the relationship between the second temperature difference value A and each preset second temperature difference value: When A When A1≤A When A2≤A When A3≤A 3. The control device for raising the primary and secondary air temperature of a boiler according to claim 2, characterized by According to the size of the first temperature difference value, the opening degree of the current temperature adjustment door (6) is corrected, including: The adjustment unit, according to the size of the first temperature difference value C, corrects the opening degree B of the temperature adjustment door (6), The adjusting unit presets a difference matrix C0, and sets C0(C1, C2, C3, C4), wherein C1 is a first preset difference, C2 is a second preset difference, C3 is a third preset difference, and C4 is a fourth preset difference, and C1>C2>C3>C4; The adjusting unit presets a correction coefficient matrix D0 for correcting the opening B of the temperature adjustment door (6), and sets D0(D1, D2, D3), wherein D1 is a first preset correction coefficient, D2 is a second preset correction coefficient, and D3 is a third preset correction coefficient, and 1 The adjusting unit determines the correction coefficient of the opening B of the temperature adjustment door (6) according to the relationship between the size of the difference C and each data of the preset difference matrix C0, and corrects the current adjusting speed B: When C When C1≤C When C2≤C When C3≤C

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