Intelligent control system and control method for thermal deviation of four-corner tangential combustion boiler

Abstract

The present application relates to the technical field of automatic control of boiler combustion, in particular to a kind of for four corner tangent circle combustion boiler thermal deviation intelligent control system and control method, intelligent control system includes:1 monitoring system module and 3 control system modules, wherein 1 monitoring system module is heat absorption amount deviation monitoring system, and 3 control system modules are despinning wind control system, burnout air volume control system, burnout air swing angle control system;Furnace is sequentially divided into main combustion zone, despinning wind zone, burnout air zone along height direction;The heat absorption amount deviation monitoring system includes left side desuperheating water system, right side desuperheating water system, left side screen passage entrance steam temperature monitoring system, left side screen passage exit steam temperature monitoring system, right side screen passage entrance steam temperature monitoring system, right side screen passage exit steam temperature monitoring system;The despinning wind control system includes despinning wind first number regulating door, despinning wind second number regulating door, despinning wind third number regulating door, despinning wind fourth number regulating door.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automatic control of boiler combustion, in particular to a heat deviation intelligent control system and control method for a four-corner tangentially fired boiler. BACKGROUND

[0002] The four-corner tangentially fired boiler has good flame fullness, high burnout degree, reasonable temperature field distribution in the furnace, strong coal adaptability, and simple operation, and becomes one of the most widely used boiler types in coal-fired power plants. However, with frequent fluctuations in unit load and complex and variable coal quality fed into the furnace, the four-corner tangentially fired boiler is prone to have a large deviation of superheated steam temperature on the left and right sides at the furnace outlet, which results in a large amount of single-side desuperheating water and single-side over-temperature of the heating surface tube wall, affects the adjustment of main steam and reheat steam temperature, and even causes the heating surface tube to burst, affecting the safe and economic operation of the unit. The main reason is that the air distribution mode of the combustion system has a lag and low precision, and cannot accurately respond to changes in coal quality and load in time, resulting in serious residual rotation of flue gas at the furnace outlet and finally causing heat deviation.

[0003] Currently, the common methods to reduce the heat deviation of flue gas at the furnace outlet mainly include the following: 1) through primary air, secondary air, and overfire air reverse cutting technology; 2) by adjusting the overfire air rate; 3) by optimizing the secondary air distribution mode; and 4) by technical improvement of the structure and arrangement of high-temperature heating surfaces. However, the above methods cannot realize automatic monitoring and efficient feedback regulation of the heat deviation at the furnace outlet, and also cause new problems, such as the primary air reverse cutting technology which has a certain impact on the good distribution of the velocity field in the main combustion zone, and changing the secondary air distribution mode which may affect the stability of combustion in the furnace. SUMMARY

[0004] Therefore, the purpose of the present application is to provide a heat deviation intelligent control system and control method for a four-corner tangentially fired boiler, which can fundamentally solve the problems of large deviation of superheated steam temperature on the left and right sides at the furnace outlet and large deviation of desuperheating water on the left and right sides.

[0005] To solve the above technical problems, the application provides a heat deviation intelligent control system for a four-corner tangential combustion boiler, which comprises one monitoring system module and three control system modules, wherein the one monitoring system module is a heat absorption deviation monitoring system, and the three control system modules are a deswirl wind control system, a combustion air volume control system and a combustion air swing angle control system; a furnace is sequentially divided into a main combustion area, a deswirl wind area and a combustion air area along a height direction; the heat absorption deviation monitoring system comprises a left desuperheating water system, a right desuperheating water system, a left screen inlet steam temperature monitoring system, a left screen outlet steam temperature monitoring system, a right screen inlet steam temperature monitoring system and a right screen outlet steam temperature monitoring system; the deswirl wind control system comprises a first deswirl wind adjusting door, a second deswirl wind adjusting door, a third deswirl wind adjusting door and a fourth deswirl wind adjusting door, the first deswirl wind adjusting door, the second deswirl wind adjusting door, the third deswirl wind adjusting door and the fourth deswirl wind adjusting door are in one-to-one correspondence with a first deswirl wind nozzle, a second deswirl wind nozzle, a third deswirl wind nozzle and a fourth deswirl wind nozzle arranged in the deswirl wind area, the first deswirl wind nozzle, the second deswirl wind nozzle, the third deswirl wind nozzle and the fourth deswirl wind nozzle are uniformly and spacedly distributed along a circumference of the deswirl wind area, and the deswirl wind control system is in communication connection with the heat absorption deviation monitoring system.

[0006] Optionally, the deswirl wind control system further comprises a first deswirl wind speed measuring device, a second deswirl wind speed measuring device, a third deswirl wind speed measuring device and a fourth deswirl wind speed measuring device, the first deswirl wind speed measuring device is used for measuring a wind speed flowing into the first deswirl wind nozzle, the second deswirl wind speed measuring device is used for measuring a wind speed flowing into the second deswirl wind nozzle, the third deswirl wind speed measuring device is used for measuring a wind speed flowing into the third deswirl wind nozzle, and the fourth deswirl wind speed measuring device is used for measuring a wind speed flowing into the fourth deswirl wind nozzle.

[0007] Optionally, the deswirl wind control system is located between the uppermost burner and the lowermost combustion air, the first deswirl wind nozzle is arranged between a first deswirl layer corner and a second deswirl layer corner, and a distance between the first deswirl layer corner and the first deswirl wind nozzle is one fourth of a distance between the first deswirl layer corner and the second deswirl layer corner.

[0008] Optionally, the heat absorption deviation monitoring system completes automatic monitoring of desuperheating water volume through the left desuperheating water system and the right desuperheating water system, automatic monitoring of a temperature difference between a left screen inlet header and a left screen outlet header through the left screen inlet steam temperature monitoring system and the left screen outlet steam temperature monitoring system, and automatic monitoring of a temperature difference between a right screen inlet header and a right screen outlet header through the right screen inlet steam temperature monitoring system and the right screen outlet steam temperature monitoring system.

[0009] Optionally, the burnout air volume control system comprises five burnout air layer adjusting baffles, each of which can be independently adjusted, and the burnout air volume control system is in communication connection with the heat absorption amount deviation monitoring system.

[0010] Optionally, the burnout air swing angle control system comprises four horizontal swing angle adjusting devices, which are respectively located at four corners of the burnout air area, and each of the horizontal swing angle adjusting devices comprises an electric actuator, and the burnout air swing angle control system is in communication connection with the heat absorption amount deviation monitoring system.

[0011] Optionally, the cyclone air jet flow circle rotation direction of the cyclone air area is opposite to the primary air jet flow circle rotation direction of the main combustion area, and the burnout air jet flow circle rotation direction of the burnout air area is opposite to the rotation direction of the flue gas after flowing through the cyclone air area.

[0012] The application further provides a four-corner tangential firing boiler heat deviation intelligent control method.

[0013] S1. According to the unit load instruction, the total coal amount instruction and the total air volume instruction, the initial setting of the control range of the left and right sides of the screen superheater water amount deviation and the left and right sides of the screen superheater temperature rise deviation is completed.

[0014] S2. The left and right sides of the desuperheating water system complete the automatic monitoring of the desuperheating water amount, the left side of the screen superheater inlet temperature monitoring system and the left side of the screen superheater outlet temperature monitoring system complete the automatic monitoring of the temperature difference of the left side of the screen superheater inlet header and the left side of the screen superheater outlet header, and the right side of the screen superheater inlet temperature monitoring system and the right side of the screen superheater outlet temperature monitoring system complete the automatic monitoring of the temperature difference of the right side of the screen superheater inlet header and the right side of the screen superheater outlet header.

[0015] S3. The heat absorption amount deviation monitoring system judges whether the desuperheating water amount deviation and the temperature rise deviation are within the control range, if yes, the step is repeated after a preset interval, if the deviation is greater than the control range and the deviation is large, step S4 is executed, and if the deviation is greater than the control range and the deviation is small, step S5 is executed.

[0016] S4. The cyclone control system automatically adjusts the air volume through the first, second, third and fourth cyclone adjusting doors to complete the coarse adjustment of the cyclone, and the burnout air volume control system and the burnout air swing angle control system complete the fine adjustment of the cyclone, and then step S3 is executed.

[0017] S5. The burnout air volume control system and the burnout air swing angle control system complete the fine adjustment of the cyclone, and then step S3 is executed.

[0018] The technical scheme of the application has the following advantages:

[0019] The application provides a heat deviation intelligent control system for a four-corner tangential combustion boiler, which is characterized in that a despinning air area is arranged between a main combustion area and a overfire air area, the despinning air area is provided with a first despinning nozzle, a second despinning nozzle, a third despinning nozzle and a fourth despinning nozzle, the rotation direction of the despinning air jet from the first despinning nozzle, the second despinning nozzle, the third despinning nozzle and the fourth despinning nozzle is opposite to the rotation direction of the air jet from the primary air nozzle in the main combustion area, so that the despinning effect is realized, and then the despinning air flows through the overfire air area, the despinning air control system is in communication connection with the heat absorption deviation monitoring system, so that the feedback adjustment can be more timely, when the desuperheating water quantity deviation and the steam temperature rise deviation monitored by the heat absorption deviation monitoring system exceed the control range, the despinning air control system automatically adjusts the air quantity through a first despinning air adjusting door, a second despinning air adjusting door, a third despinning air adjusting door and a fourth despinning air adjusting door, for example, when the smoke rotation direction of the main combustion area is clockwise, the first despinning air adjusting door, the second despinning air adjusting door, the third despinning air adjusting door and the fourth despinning air adjusting door are opened, and the rotation direction of the despinning air jet from the first despinning nozzle, the second despinning nozzle, the third despinning nozzle and the fourth despinning nozzle is counterclockwise, so that the desuperheating water quantity deviation and the steam temperature rise deviation are eliminated or reduced, and therefore the residual rotation of the flue gas at the furnace outlet can be more effectively reduced, and the problems of the large deviation of the superheated steam temperature and the large deviation of the desuperheating water on the left and right sides of the furnace outlet are fundamentally solved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0021] Figure 1 The structural schematic diagram of the heat deviation intelligent control system for the four-corner tangential combustion boiler is provided for the embodiment 1 of the present application.

[0022] Figure 2 The flow chart of the heat deviation intelligent control method for the four-corner tangential combustion boiler is provided for the embodiment 2 of the present application.

[0023] Explanation of reference signs:

[0024] 1, furnace; 2, main combustion zone; 3, deswirl zone; 4, overfire air zone; 5, deswirl control system; 6, overfire air flow control system; 7, overfire air swing angle control system; 8, heat absorption deviation monitoring system; 10, uppermost burner; 11, first deswirl nozzle; 12, second deswirl nozzle; 13, third deswirl nozzle; 14, fourth deswirl nozzle; 15, lowermost overfire air; 16, overfire air nozzle; 17, left-side platen pass inlet header; 18, left-side platen pass outlet header; 19, right-side platen pass inlet header; 20, right-side platen pass outlet header; 21, burner first angle; 22, burner second angle; 23, burner third angle; 24, burner fourth angle; 25, platen superheater; 26, furnace outlet; 27, arch; 31, deswirl layer first angle; 32, deswirl layer second angle; 33, deswirl layer third angle; 34, deswirl layer fourth angle; 51, deswirl first regulating door; 52, deswirl second regulating door; 53, deswirl third regulating door; 54, deswirl fourth regulating door; 55, deswirl first speed measuring device; 56, deswirl second speed measuring device; 57, deswirl third speed measuring device; 58, deswirl fourth speed measuring device; 61, overfire air layer regulating baffle; 71, horizontal swing angle regulating device; 81, left-side attemperation water system; 82, right-side attemperation water system; 83, left-side platen pass inlet steam temperature monitoring system; 84, left-side platen pass outlet steam temperature monitoring system; 85, right-side platen pass inlet steam temperature monitoring system; 86, right-side platen pass outlet steam temperature monitoring system. DETAILED DESCRIPTION

[0025] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0026] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" 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 elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present application, it should be noted that unless specifically defined and limited otherwise, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0029] Embodiment 1

[0030] The embodiment provides a heat deviation intelligent control system for a four-corner tangential firing boiler.

[0031] In one embodiment, as shown in Figure 1 The intelligent control system comprises one monitoring system module and three control system modules, wherein the one monitoring system module is a heat absorption deviation monitoring system 8, and the three control system modules are a deswirl air control system 5, a burnout air volume control system 6 and a burnout air swing angle control system 7. The furnace 1 is sequentially divided into a main combustion area 2, a deswirl air area 3 and a burnout air area 4 along the height direction. The heat absorption deviation monitoring system 8 comprises a left desuperheating water system 81, a right desuperheating water system 82, a left screen inlet steam temperature monitoring system 83, a left screen outlet steam temperature monitoring system 84, a right screen inlet steam temperature monitoring system 85 and a right screen outlet steam temperature monitoring system 86. The deswirl air control system 5 comprises a first deswirl air adjusting door 51, a second deswirl air adjusting door 52, a third deswirl air adjusting door 53 and a fourth deswirl air adjusting door 54. The first deswirl air adjusting door 51, the second deswirl air adjusting door 52, the third deswirl air adjusting door 53 and the fourth deswirl air adjusting door 54 correspond to a first deswirl air nozzle 11, a second deswirl air nozzle 12, a third deswirl air nozzle 13 and a fourth deswirl air nozzle 14 respectively arranged in the deswirl air area 3. The first deswirl air nozzle 11, the second deswirl air nozzle 12, the third deswirl air nozzle 13 and the fourth deswirl air nozzle 14 are uniformly and spacedly distributed along the circumference of the deswirl air area 3. The deswirl air control system 5 is in communication connection with the heat absorption deviation monitoring system 8.

[0032] In this embodiment, by setting the deswirl area 3 between the main combustion area 2 and the overfire air area 4, and setting the first deswirl port 11, the second deswirl port 12, the third deswirl port 13, and the fourth deswirl port 14 in the deswirl area 3, the rotational direction of the deswirl air jetted from the first deswirl port 11, the second deswirl port 12, the third deswirl port 13, and the fourth deswirl port 14 can be opposite to the rotational direction of the air jetted from the primary air port in the main combustion area 2, so as to realize the deswirl effect, and then flow through the overfire air area 4. The deswirl control system 5 is in communication connection with the heat absorption deviation monitoring system 8, so as to feedback and adjust more timely. When the heat absorption deviation monitoring system 8 monitors that the desuperheating water quantity deviation and the steam temperature rise deviation exceed the control range, the deswirl control system 5 automatically adjusts the air quantity through the first deswirl adjusting door 51, the second deswirl adjusting door 52, the third deswirl adjusting door 53, and the fourth deswirl adjusting door 54. For example, when the rotational direction of the flue gas in the main combustion area is clockwise, if the right desuperheating water quantity and the steam temperature rise are higher than the left desuperheating water quantity and the steam temperature rise, the first deswirl adjusting door 51, the second deswirl adjusting door 52, the third deswirl adjusting door 53, and the fourth deswirl adjusting door 54 are opened, and the rotational direction of the deswirl air jetted from the first deswirl port 11, the second deswirl port 12, the third deswirl port 13, and the fourth deswirl port 14 is counterclockwise, so as to eliminate or reduce the desuperheating water quantity deviation and the steam temperature rise deviation. Therefore, the residual rotation of the flue gas at the furnace outlet 26 can be reduced more effectively, and the problems of the deviation of the superheated steam temperature at the left and right sides of the furnace outlet 26 and the deviation of the desuperheating water at the left and right sides can be fundamentally solved.

[0033] As shown in Figure 1 The main combustion area 2 has the burner first horn 21, the burner second horn 22, the burner third horn 23, and the burner fourth horn 21. The deswirl can be realized by adjusting the orientation of the burner port at the burner first horn 21, the burner second horn 22, the burner third horn 23, and the burner fourth horn 21.

[0034] On the basis of the above-mentioned embodiments, in a preferred embodiment, the cyclone control system 5 further comprises a first cyclone speed measuring device 55, a second cyclone speed measuring device 56, a third cyclone speed measuring device 57, and a fourth cyclone speed measuring device 58. The first cyclone speed measuring device 55 is used to measure the speed of the wind flowing into the first cyclone nozzle 11, the second cyclone speed measuring device 56 is used to measure the speed of the wind flowing into the second cyclone nozzle 12, the third cyclone speed measuring device 57 is used to measure the speed of the wind flowing into the third cyclone nozzle 13, and the fourth cyclone speed measuring device 58 is used to measure the speed of the wind flowing into the fourth cyclone nozzle 14. In this embodiment, by arranging the first cyclone speed measuring device 55, the second cyclone speed measuring device 56, the third cyclone speed measuring device 57, and the fourth cyclone speed measuring device 58, the cyclone wind speed can be better monitored, thereby achieving more accurate control.

[0035] On the basis of the above-mentioned embodiments, in a preferred embodiment, the cyclone control system 5 is located between the uppermost burner 10 and the lowermost overfire air 15; the first cyclone nozzle 11 is arranged between the first cyclone layer corner 31 and the second cyclone layer corner 32, and the distance between the first cyclone nozzle 11 and the first cyclone layer corner 31 is one-fourth of the distance between the first cyclone layer corner 31 and the second cyclone layer corner 32. In this embodiment, the distance between the first cyclone nozzle 11 and the first cyclone layer corner 31 is one-fourth of the distance between the first cyclone layer corner 31 and the second cyclone layer corner 32, and the second cyclone nozzle 12, the third cyclone nozzle 13, and the fourth cyclone nozzle 14 are uniformly distributed along the circumference, i.e., the distance between the second cyclone nozzle 12 and the second cyclone layer corner 32 is one-fourth of the distance between the second cyclone layer corner 32 and the third cyclone layer corner 33, the distance between the third cyclone nozzle 13 and the third cyclone layer corner 33 is one-fourth of the distance between the third cyclone layer corner 33 and the fourth cyclone layer corner 34, and the distance between the fourth cyclone nozzle 14 and the fourth cyclone layer corner 34 is one-fourth of the distance between the first cyclone layer corner 31 and the fourth cyclone layer corner 34.

[0036] Therefore, the cyclone wind formed by the first cyclone nozzle 11, the second cyclone nozzle 12, the third cyclone nozzle 13, and the fourth cyclone nozzle 14 is closer to the center of the rotating air flow, the cyclone effect is more obvious, and cyclone can be fundamentally achieved.

[0037] On the basis of the above-mentioned embodiment, in a preferred embodiment, the heat absorption amount deviation monitoring system 8 completes the automatic monitoring of the desuperheating water amount through the left desuperheating water system 81 and the right desuperheating water system 82, and completes the automatic monitoring of the temperature difference of the steam at the left screen inlet header 17 and the left screen outlet header 18 through the left screen inlet steam temperature monitoring system 83 and the left screen outlet steam temperature monitoring system 84, and completes the automatic monitoring of the temperature difference of the steam at the right screen inlet header 19 and the right screen outlet header 20 through the right screen inlet steam temperature monitoring system 85 and the right screen outlet steam temperature monitoring system 86. Specifically, the automatic monitoring of the temperature difference of the steam is realized through the thermocouple sensor and the transmitter.

[0038] On the basis of the above-mentioned embodiment, in a preferred embodiment, the overfire air flow control system 6 includes 5 layers of overfire air layer adjusting baffles 61, each of which can be independently adjusted, and the overfire air flow control system 6 is in communication connection with the heat absorption amount deviation monitoring system 8. Specifically, the overfire air flow control system 6 is provided with a baffle adjusting scheme, for example, when the right desuperheating water amount and the temperature rise of the steam are higher than the left desuperheating water amount and the temperature rise of the steam, the 5 layers of overfire air layer adjusting baffles 61 are opened or the number of the baffles opened is increased, and when the left desuperheating water amount and the temperature rise of the steam are higher than the right desuperheating water amount and the temperature rise of the steam, the 5 layers of overfire air layer adjusting baffles 61 are closed or the number of the baffles opened is decreased.

[0039] On the basis of the above-mentioned embodiment, in a preferred embodiment, the overfire air swing angle control system 7 includes 4 sets of horizontal swing angle adjusting devices 71, which are respectively located at the 4 corners of the overfire air region 4, and the horizontal swing angle adjusting device 71 includes an electric actuator, and the overfire air swing angle control system 7 is in communication connection with the heat absorption amount deviation monitoring system 8. In this embodiment, the horizontal swing angle adjusting device 71 can adjust the rotation direction of the air in the overfire air layer, thereby realizing the fundamental deswirling.

[0040] On the basis of the above-mentioned embodiment, in a preferred embodiment, the deswirling air jet flow in the deswirling air region 3 is opposite to the primary air jet flow in the main combustion region 2, and the overfire air jet flow in the overfire air region 4 is opposite to the rotation direction of the flue gas after flowing through the deswirling air region 3. Specifically, when the rotation direction of the primary air and the secondary air jet flow in the main combustion region 2 is clockwise, the rotation direction of the deswirling air jet flow in the deswirling air region 3 is counterclockwise, and the flue gas is still clockwise after flowing through the deswirling air region 3, then the rotation direction of the overfire air jet flow in the overfire air region 4 is counterclockwise, and when the flue gas is counterclockwise after flowing through the deswirling air region 3, then the rotation direction of the overfire air jet flow in the overfire air region 4 is clockwise.

[0041] Example 2

[0042] The embodiment provides a method for intelligent control of thermal deviation of a four-corner tangential combustion boiler.As shown in the above embodiment, the method comprises the following steps: Figure 2

[0043] S1. Initial setting of control ranges of left and right sides of the screen superheater 25 is completed according to the unit load instruction, the total coal quantity instruction and the total air quantity instruction. It should be noted that the person skilled in the art can and has the ability to complete the initial setting of the control ranges of the left and right sides of the screen superheater 25 according to the unit load instruction, the total coal quantity instruction and the total air quantity instruction or adjustment, and the embodiment does not limit the control ranges of the left and right sides of the screen superheater 25.

[0044] S2. The left and right sides of the desuperheating water system 81, 82 complete automatic monitoring of the desuperheating water quantity; the left side of the screen over inlet steam temperature monitoring system 83, the left side of the screen over outlet steam temperature monitoring system 84 complete automatic monitoring of the steam temperature difference of the left side of the screen over inlet header 17 and the left side of the screen over outlet header 18; the right side of the screen over inlet steam temperature monitoring system 85, the right side of the screen over outlet steam temperature monitoring system 86 complete automatic monitoring of the steam temperature difference of the right side of the screen over inlet header 19 and the right side of the screen over outlet header 20. The step is automatic monitoring, and the steam temperature difference automatic monitoring is realized through a thermocouple sensor and a transmitter.

[0045] S3. The heat absorption deviation monitoring system 8 judges whether the desuperheating water quantity deviation and the steam temperature rise deviation are within the control range, if yes, the step is repeated after a preset interval, if the deviation exceeds the control range and the deviation is large, step S4 is executed, and if the deviation exceeds the control range and the deviation is small, step S5 is executed. Specifically, the preset time can be 15 minutes.

[0046] S4. The desuperheating wind control system 5 performs automatic adjustment of the air quantity through the desuperheating wind first adjusting door 51, the desuperheating wind second adjusting door 52, the desuperheating wind third adjusting door 53 and the desuperheating wind fourth adjusting door 54, completes the coarse adjustment of the desuperheating wind, the burnout wind quantity control system 6 and the burnout wind swing angle control system 7 complete the fine adjustment of the desuperheating wind, and then step S3 is executed. The step is when the deviation exceeds the control range and the deviation is large, and the desuperheating is completely completed through the desuperheating wind control system 5, the burnout wind quantity control system 6 and the burnout wind swing angle control system 7.

[0047] S5. The burnout wind quantity control system 6 and the burnout wind swing angle control system 7 complete the fine adjustment of the desuperheating, and then step S3 is executed. The step is when the deviation exceeds the control range and the deviation is small, and the desuperheating is completed only through the burnout wind quantity control system 6 and the burnout wind swing angle control system 7.

[0048] Obviously, the above-mentioned embodiments are only examples for clearly illustrating the present application, but not limitation to the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, it is not necessary and also impossible to enumerate all the embodiments. The changes or variations derived from the above are still within the protection scope of the present application.

Claims

1. A thermal deviation intelligent control system for a tangentially fired furnace boiler, characterized in that, It comprises: 1 monitoring system module and 3 control system modules, wherein 1 monitoring system module is a heat absorption deviation monitoring system (8), 3 control system modules are a despinning air control system (5), a combustion air volume control system (6), and a combustion air swing angle control system (7); a furnace (1) is sequentially divided into a main combustion area (2), a despinning air area (3), and a combustion air area (4) along the height direction; The heat absorption deviation monitoring system (8) comprises a left desuperheating water system (81), a right desuperheating water system (82), a left screen inlet steam temperature monitoring system (83), a left screen outlet steam temperature monitoring system (84), a right screen inlet steam temperature monitoring system (85), and a right screen outlet steam temperature monitoring system (86). The despinning air control system (5) comprises a despinning air first regulating door (51), a despinning air second regulating door (52), a despinning air third regulating door (53), and a despinning air fourth regulating door (54), which are respectively one-to-one corresponding to a first despinning air nozzle (11), a second despinning air nozzle (12), a third despinning air nozzle (13), and a fourth despinning air nozzle (14) arranged in the despinning air area (3), the first despinning air nozzle (11), the second despinning air nozzle (12), the third despinning air nozzle (13), and the fourth despinning air nozzle (14) are uniformly and spacedly distributed along the circumference of the despinning air area (3), the despinning air control system (5) is in communication connection with the heat absorption deviation monitoring system (8); the rotational direction of the air flow cutting circle of the despinning air nozzle of the despinning air area (3) is opposite to that of the primary air nozzle of the main combustion area (2); the rotational direction of the air flow cutting circle of the combustion air nozzle (16) of the combustion air area (4) is opposite to that of the flue gas after flowing through the despinning air area (3), so as to solve the influence of the primary air, the secondary air, and the combustion air on the combustion stability.

2. The intelligent control system for thermal bias of a tangentially fired furnace boiler of claim 1, wherein, The despinning air control system (5) further comprises a despinning air first speed measuring device (55), a despinning air second speed measuring device (56), a despinning air third speed measuring device (57), and a despinning air fourth speed measuring device (58), the despinning air first speed measuring device (55) is used for measuring the wind speed flowing into the first despinning air nozzle (11), the despinning air second speed measuring device (56) is used for measuring the wind speed flowing into the second despinning air nozzle (12), the despinning air third speed measuring device (57) is used for measuring the wind speed flowing into the third despinning air nozzle (13), and the despinning air fourth speed measuring device (58) is used for measuring the wind speed flowing into the fourth despinning air nozzle (14).

3. The intelligent control system for thermal bias of a tangentially fired furnace boiler of claim 1, wherein, The desulfurization wind control system (5) is located between the uppermost burner (10) and the lowermost overfire air (15); the first desulfurization nozzle (11) is arranged between the first desulfurization layer horn (31) and the second desulfurization layer horn (32), and the distance between the first desulfurization layer horn (31) and the first desulfurization nozzle (11) is one fourth of the distance between the first desulfurization layer horn (31) and the second desulfurization layer horn (32).

4. The intelligent control system for thermal bias of a tangentially fired furnace boiler of claim 1, wherein, The heat absorption deviation monitoring system (8) completes automatic monitoring of the desuperheating water amount through the left desuperheating water system (81) and the right desuperheating water system (82), automatic monitoring of the temperature difference of the steam at the left side of the screen superheater inlet header (17) and the left side of the screen superheater outlet header (18) through the left side of the screen superheater inlet steam temperature monitoring system (83) and the left side of the screen superheater outlet steam temperature monitoring system (84), and automatic monitoring of the temperature difference of the steam at the right side of the screen superheater inlet header (19) and the right side of the screen superheater outlet header (20) through the right side of the screen superheater inlet steam temperature monitoring system (85) and the right side of the screen superheater outlet steam temperature monitoring system (86).

5. The intelligent control system for thermal bias of a tangentially fired furnace boiler of claim 1, wherein, The overfire air volume control system (6) comprises five overfire air layer adjusting baffles (61), each of which can be independently adjusted, and the overfire air volume control system (6) is in communication connection with the heat absorption deviation monitoring system (8).

6. The intelligent control system for thermal bias of a tangentially fired furnace boiler of claim 1, wherein, The overfire air swing angle control system (7) comprises four horizontal swing angle adjusting devices (71) located at four corners of the overfire air area (4), and each horizontal swing angle adjusting device (71) comprises an electric actuator, and the overfire air swing angle control system (7) is in communication connection with the heat absorption deviation monitoring system (8).

7. A method for intelligent control of thermal deviation of a tangentially fired furnace boiler, characterized in that, The application is applied to the intelligent control system for the four-corner tangential firing boiler heat deviation, and the intelligent control system comprises: S1. The initial setting of the control range of the left and right side desuperheating water amount deviation and the left and right side steam temperature rise deviation of the screen superheater (25) is completed according to the unit load instruction, the total coal amount instruction and the total air volume instruction; S2. The left desuperheating water system (81) and the right desuperheating water system (82) complete automatic monitoring of the desuperheating water amount; the left side of the screen superheater inlet steam temperature monitoring system (83) and the left side of the screen superheater outlet steam temperature monitoring system (84) complete automatic monitoring of the temperature difference of the steam at the left side of the screen superheater inlet header (17) and the left side of the screen superheater outlet header (18); and the right side of the screen superheater inlet steam temperature monitoring system (85) and the right side of the screen superheater outlet steam temperature monitoring system (86) complete automatic monitoring of the temperature difference of the steam at the right side of the screen superheater inlet header (19) and the right side of the screen superheater outlet header (20); S3. The heat absorption deviation monitoring system (8) judges whether the desuperheating water amount deviation and the steam temperature rise deviation are within the control range, if yes, the step is repeated after a preset interval, if the deviation exceeds the control range and the deviation is large, step S4 is executed, and if the deviation exceeds the control range and the deviation is small, step S5 is executed. S4. The despinning wind control system (5) performs automatic adjustment of the air volume through the despinning wind No. 1 adjusting door (51), the despinning wind No. 2 adjusting door (52), the despinning wind No. 3 adjusting door (53), and the despinning wind No. 4 adjusting door (54), to complete the despinning coarse adjustment; the overfire air volume control system (6) and the overfire air swing angle control system (7) complete the despinning fine adjustment, and then step S3 is executed; S5. The overfire air volume control system (6) and the overfire air swing angle control system (7) complete the despinning fine adjustment, and then step S3 is executed.

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