An automatic adjustment device for preventing ash blockage in boiler air preheater under deep peak regulation

Abstract

The present invention discloses an automatic adjustment device suitable for preventing ash blockage of a boiler air preheater under deep peak regulation. The main technical scheme adopted is: a guide adjustment device, which includes a first guide device and a second guide device. The first guide device includes a first guide contraction plate arranged on one side of an air preheater inlet flue, a first fixed guide plate arranged on one side of the air preheater inlet flue and located below the first guide contraction plate, and a first rotating actuator connected to the first guide contraction plate; the second guide device includes a second guide contraction plate arranged on the other side of the air preheater inlet flue and corresponding to the first guide contraction plate, a second fixed guide plate arranged on the other side of the air preheater inlet flue and corresponding to the first fixed guide plate, and a second rotating actuator connected to the second guide contraction plate; a control device, which is respectively connected to the first rotating actuator and the second rotating actuator.

Description

Technical Field

[0001] The invention relates to the technical field of environmental protection, and in particular to an automatic adjustment device suitable for preventing ash blockage in a boiler air preheater under deep peak regulation. Background Art

[0002] In order to adapt to the requirements of reducing carbon emissions, eliminate the dual random disturbances on the power supply side and the grid side, and increase the consumption rate of renewable energy, deep peak regulation of traditional thermal power units has become the new normal.

[0003] Under deep peak regulation, the boiler design parameters deviate from the design range after the boiler fuel amount and flue gas amount are reduced. Since the flue gas flow rate entering the air preheater through the boiler is low, the ability of the flue gas to carry fly ash is reduced, resulting in fly ash deposition in the heat exchange elements of the air preheater, blocking the air preheater, affecting the heat exchange effect of the air preheater, and also causing the air preheater differential pressure to rise, affecting the fan output, and causing adverse factors for the safe and economical operation of the thermal power plant. Summary of the invention

[0004] In view of this, the present invention provides an automatic adjustment device suitable for preventing ash blockage in boiler air preheater under deep peak regulation. The main purpose is to provide an automatic adjustment device suitable for preventing ash blockage in boiler air preheater under deep peak regulation, which has small engineering modification amount and convenient operation.

[0005] In order to achieve the above object, the present invention mainly provides the following technical solutions:

[0006] The embodiment of the present invention provides an automatic adjustment device for preventing ash blockage in a boiler air preheater under deep peak regulation. The device comprises:

[0007] The guide regulating device comprises a first guide device and a second guide device, wherein the first guide device comprises a first guide contraction plate arranged at one side of the air preheater inlet flue, a first fixed guide plate arranged at one side of the air preheater inlet flue and below the first guide contraction plate, and a first rotating actuator connected to the first guide contraction plate and used to drive the first guide contraction plate to rotate counterclockwise and swing at a specified angle so that the first guide contraction plate is connected to the first fixed guide plate; the second guide device comprises a second guide contraction plate arranged at the other side of the air preheater inlet flue and corresponding to the first guide contraction plate, a second fixed guide plate arranged at the other side of the air preheater inlet flue and corresponding to the first fixed guide plate, and a second rotating actuator connected to the second guide contraction plate and used to drive the second guide contraction plate to rotate clockwise and swing at a specified angle so that the second guide contraction plate is connected to the second fixed guide plate; the distance between the first guide contraction plate and the second guide contraction plate is greater than the distance between the first fixed guide plate and the second fixed guide plate;

[0008] A control device is respectively connected to the first rotating actuator and the second rotating actuator and is used to control the first rotating actuator to drive the first guide retraction plate to rotate counterclockwise and swing at a specified angle so that the first guide retraction plate is connected to the first fixed guide plate according to the boiler ≦50% rated load operation signal sent by the boiler, and is used to control the second rotating actuator to drive the second guide retraction plate to rotate clockwise and swing at a specified angle so that the second guide retraction plate is connected to the second fixed guide plate.

[0009] As mentioned above, the first rotation actuator drives the first guide contraction plate to rotate counterclockwise and swing at a specified angle within a range of 0°-30°;

[0010] The second rotation actuator drives the second guide contraction plate to rotate clockwise and swing at a specified angle within a range of 0°-30°.

[0011] As mentioned above, both the first rotation actuator and the second rotation actuator are electric drive mechanisms; or, both the first rotation actuator and the second rotation actuator are pneumatic drive mechanisms.

[0012] As mentioned above, the control device includes an industrial computer connected to the first rotation actuator and the second rotation actuator respectively, and a signal receiving device connected to the industrial computer.

[0013] As mentioned above, the flow guide regulating device also includes a third flow guide device and a fourth flow guide device, the third flow guide device includes a third flow guide contraction plate arranged on one side of the air preheater inlet flue and arranged side by side with the first fixed flow guide plate, a third fixed flow guide plate arranged on one side of the air preheater inlet flue and located below the third flow guide contraction plate, a third rotating actuator connected to the third flow guide contraction plate and used to drive the third flow guide contraction plate to rotate counterclockwise and swing at a specified angle so that the third flow guide contraction plate is respectively connected to the first fixed flow guide plate and the third fixed flow guide plate; the fourth flow guide device includes a fourth flow guide contraction plate arranged on the other side of the air preheater inlet flue and corresponding to the third flow guide contraction plate, a fourth fixed flow guide plate arranged on the other side of the air preheater inlet flue and corresponding to the third fixed flow guide plate, and a third rotating actuator connected to the third flow guide contraction plate and used to drive the third flow guide contraction plate to rotate counterclockwise and swing at a specified angle so that the third flow guide contraction plate is respectively connected to the first fixed flow guide plate and the third fixed flow guide plate. The fourth guide contraction plate is connected to a fourth rotating actuator for driving the fourth guide contraction plate to rotate clockwise and swing at a specified angle so that the fourth guide contraction plate is respectively connected to the second fixed guide plate and the fourth fixed guide plate; the third rotating actuator and the fourth rotating actuator are both connected to the control device, and the control device is also used to control the third rotating actuator to drive the third guide contraction plate to rotate counterclockwise and swing at a specified angle according to the boiler ≦50% rated load operation signal sent by the boiler so that the third guide contraction plate is respectively connected to the first fixed guide plate and the third fixed guide plate, and to control the fourth rotating actuator to drive the fourth guide contraction plate to rotate clockwise and swing at a specified angle so that the fourth guide contraction plate is respectively connected to the second fixed guide plate and the fourth fixed guide plate;

[0014] The distance between the first fixed guide plate and the second fixed guide plate is greater than the distance between the third guide contraction plate and the fourth guide contraction plate;

[0015] The distance between the third flow guide contraction plate and the fourth flow guide contraction plate is greater than the distance between the third fixed flow guide plate and the fourth fixed flow guide plate.

[0016] As mentioned above, when the first rotating actuator drives the first guide contraction plate to rotate counterclockwise and swing at a specified angle so that the first guide contraction plate is connected to the first fixed guide plate, and the third rotating actuator drives the third guide contraction plate to rotate counterclockwise and swing at a specified angle so that the third guide contraction plate is respectively connected to the first fixed guide plate and the third fixed guide plate, the first guide contraction plate and the third guide contraction plate are on the same straight line;

[0017] When the second rotating actuator drives the second guide retraction plate to rotate clockwise and swing at a specified angle so that the second guide retraction plate is connected to the second fixed guide plate, and the fourth rotating actuator drives the fourth guide retraction plate to rotate clockwise and swing at a specified angle so that the fourth guide retraction plate is respectively connected to the second fixed guide plate and the fourth fixed guide plate, the second guide retraction plate and the fourth guide retraction plate are on the same straight line.

[0018] As mentioned above, the guide regulating device also includes a fifth guide device and a sixth guide device, the fifth guide device includes a fifth guide contraction plate arranged on one side of the air preheater inlet flue and arranged side by side with the third fixed guide plate, a fifth fixed guide plate arranged on one side of the air preheater inlet flue and located below the fifth guide contraction plate, a fifth rotating actuator connected to the fifth guide contraction plate and used to drive the fifth guide contraction plate to rotate counterclockwise and swing at a specified angle so that the fifth guide contraction plate is respectively connected to the third fixed guide plate and the fifth fixed guide plate; the sixth guide device includes a sixth guide contraction plate arranged on the other side of the air preheater inlet flue and corresponding to the fifth guide contraction plate, a sixth fixed guide plate arranged on the other side of the air preheater inlet flue and corresponding to the fifth fixed guide plate, and a fifth rotating actuator connected to the fifth guide contraction plate and used to drive the fifth guide contraction plate to rotate counterclockwise and swing at a specified angle so that the fifth guide contraction plate is respectively connected to the third fixed guide plate and the fifth fixed guide plate. The sixth guide contraction plate is connected to and used for driving the sixth guide contraction plate to rotate clockwise and swing at a specified angle so that the sixth guide contraction plate is respectively connected to the fourth fixed guide plate and the sixth fixed guide plate; the fifth rotation actuator and the sixth rotation actuator are both connected to the control device, and the control device is also used to control the fifth rotation actuator to drive the fifth guide contraction plate to rotate counterclockwise and swing at a specified angle according to the boiler ≦50% rated load operation signal sent by the boiler so that the fifth guide contraction plate is respectively connected to the third fixed guide plate and the fifth fixed guide plate, and to control the sixth rotation actuator to drive the sixth guide contraction plate to rotate clockwise and swing at a specified angle so that the sixth guide contraction plate is respectively connected to the fourth fixed guide plate and the sixth fixed guide plate;

[0019] The distance between the third fixed guide plate and the fourth fixed guide plate is greater than the distance between the fifth guide contraction plate and the sixth guide contraction plate;

[0020] The distance between the fifth guide contraction plate and the sixth guide contraction plate is greater than the distance between the fifth fixed guide plate and the sixth fixed guide plate.

[0021] As mentioned above, when the first rotating actuator drives the first guide contraction plate to rotate counterclockwise and swing at a specified angle so that the first guide contraction plate is connected to the first fixed guide plate, the third rotating actuator drives the third guide contraction plate to rotate counterclockwise and swing at a specified angle so that the third guide contraction plate is respectively connected to the first fixed guide plate and the third fixed guide plate, and the fifth rotating actuator drives the fifth guide contraction plate to rotate counterclockwise and swing at a specified angle so that the fifth guide contraction plate is respectively connected to the third fixed guide plate and the fifth fixed guide plate, the first guide contraction plate, the third guide contraction plate and the fifth guide contraction plate are on the same straight line;

[0022] When the second rotating actuator drives the second guide contraction plate to rotate clockwise and swing at a specified angle so that the second guide contraction plate is connected to the second fixed guide plate, the fourth rotating actuator drives the fourth guide contraction plate to rotate clockwise and swing at a specified angle so that the fourth guide contraction plate is respectively connected to the second fixed guide plate and the fourth fixed guide plate, and the sixth rotating actuator drives the sixth guide contraction plate to rotate clockwise and swing at a fixed angle so that the sixth guide contraction plate is respectively connected to the fourth fixed guide plate and the sixth fixed guide plate, the second guide contraction plate, the fourth guide contraction plate and the sixth guide contraction plate are on the same straight line.

[0023] As mentioned above, the third rotation actuator drives the third guide contraction plate to rotate counterclockwise and swing at a specified angle within a range of 0°-30°;

[0024] The fifth rotation actuator drives the fifth guide contraction plate to rotate counterclockwise and swing at a specified angle within a range of 0°-30°;

[0025] The fourth rotation actuator drives the fourth guide contraction plate to rotate clockwise and swing at a specified angle within a range of 0°-30°;

[0026] The sixth rotation actuator drives the sixth guide contraction plate to rotate clockwise and swing at a specified angle within a range of 0°-30°.

[0027] As mentioned above, the third rotation actuator, the fourth rotation actuator, the fifth rotation actuator and the sixth rotation actuator are all electric drive mechanisms; or, the third rotation actuator, the fourth rotation actuator, the fifth rotation actuator and the sixth rotation actuator are all pneumatic drive mechanisms.

[0028] By means of the above technical solution, the automatic adjustment device for preventing ash blockage in boiler air preheater under deep peak regulation of the present invention has at least the following advantages:

[0029] The automatic adjustment device for preventing ash blockage in the air preheater of a boiler under deep peak regulation of the present invention is suitable for arranging a guide adjustment device including a first guide device and a second guide device, so that the flue gas flow rate under deep peak regulation reaches the designed range, the fly ash carrying capacity is enhanced, ash blockage in the air preheater is avoided, the heat exchange process of the air preheater is strengthened, and the differential pressure of the air preheater is reduced, so that the operating safety and economy of the entire boiler are significantly improved, and the entire adjustment method associates the guide contraction plate with the load, and the adjustment process adopts an automatic control method, which reduces the labor intensity of the operating personnel.

[0030] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of an automatic adjustment device for preventing ash blockage in an air preheater of a boiler under deep peak regulation when the boiler is operating normally according to the present invention;

[0032] Figure 2 It is a structural schematic diagram of an automatic adjustment device for preventing ash blockage in an air preheater of a deep peak-shaving boiler when the boiler enters a deep peak-shaving state according to the present invention;

[0033] Figure 3 It is a structural schematic diagram of the flow guide regulating device including four flow guide devices when the boiler is in normal operation under the present invention;

[0034] Figure 4 It is a structural schematic diagram of the flow guide regulating device including four flow guide devices when the boiler enters the deep peak regulation state according to the present invention;

[0035] Figure 5 It is a structural schematic diagram of the flow guide regulating device including 6 flow guide devices during normal operation of the boiler according to the present invention;

[0036] Figure 6 It is a structural schematic diagram of the flow diversion regulating device including 6 flow diversion devices when the boiler enters the deep peak regulation state according to the present invention. DETAILED DESCRIPTION

[0037] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation method, structure, characteristics and effects of the present invention application are described in detail below in combination with the accompanying drawings and preferred embodiments. In the figure, the arrow direction is the flow direction of the flue gas.

[0038] like Figure 1 As shown, an embodiment of the present invention proposes an automatic adjustment device suitable for preventing ash blockage in a boiler air preheater under deep peak regulation, which includes: a flow control device 1 and a control device 2.

[0039] like Figure 1 to Figure 2As shown, the flow guide regulating device 1 comprises a first flow guide device 11 and a second flow guide device 12, wherein the first flow guide device 11 comprises a first flow guide contraction plate 111 arranged at one side of the inlet flue of the air preheater 3, a first fixed flow guide plate 112 arranged at one side of the inlet flue of the air preheater 3 and located below the first flow guide contraction plate 111, and a first rotating actuator 113 connected to the first flow guide contraction plate 111 and used to drive the first flow guide contraction plate 111 to rotate counterclockwise and swing at a specified angle so that the first flow guide contraction plate 111 is connected to the first fixed flow guide plate 112; the second flow guide device 12 comprises a second flow guide device 111 arranged at the other side of the inlet flue of the air preheater 3 and corresponding to the first flow guide contraction plate 111. A contraction plate 121, a second fixed guide plate 122 arranged at the other side of the inlet flue of the air preheater 3 and corresponding to the first fixed guide plate 112, and a second rotating actuator 123 connected to the second guide contraction plate 121 and used to drive the second guide contraction plate 121 to rotate clockwise and swing at a specified angle so that the second guide contraction plate 121 is connected to the second fixed guide plate 122; the distance between the first guide contraction plate 111 and the second guide contraction plate 121 is greater than the distance between the first fixed guide plate 112 and the second fixed guide plate 121; in the present invention, the first rotating actuator 113 drives the first guide contraction plate 111 to rotate counterclockwise and swing at a specified angle within the range of 0°-30°. The second rotating actuator 123 drives the second guide contraction plate 122 to rotate clockwise and swing at a specified angle within the range of 0°-30°, and the first rotating actuator 113 and the second rotating actuator 123 are both electric drive mechanisms; or the first rotating actuator 113 and the second rotating actuator 123 are both pneumatic drive mechanisms. The control device 2 is respectively connected to the first rotating actuator 113 and the second rotating actuator 123 and is used to control the first rotating actuator 113 to drive the first guide contraction plate 111 to rotate counterclockwise and swing at a specified angle so that the first guide contraction plate 111 is connected to the first fixed guide plate, and to control the second rotating actuator 123 to drive the second guide contraction plate 121 to rotate clockwise and swing at a specified angle so that the second guide contraction plate 121 is connected to the second fixed guide plate 122 according to the boiler ≦50% rated load operation signal sent by the boiler.The control device 2 includes an industrial computer 21 connected to the first rotating actuator 113 and the second rotating actuator 123 respectively, and a signal receiving device 22 connected to the industrial computer 21, the signal receiving device 22 is used to receive the boiler rated load condition operation signal sent by the boiler and send the boiler rated load condition operation signal to the industrial computer 21, the industrial computer 21 is used to control the first rotating actuator 113 to drive the first guide contraction plate 111 to rotate counterclockwise and swing at a specified angle so that the first guide contraction plate 111 is connected to the first fixed guide plate 112 according to the received boiler ≦50% rated load operation signal, and to control the second rotating actuator 123 to drive the second guide contraction plate 121 to rotate clockwise and swing at a specified angle so that the second guide contraction plate 121 is connected to the second fixed guide plate 122.

[0040] During specific operation, the lower boiler operates normally, that is, when it operates at 50%~100% of the rated load, the flue gas flow rate of the lower boiler is large, the flue gas flow rate at the air preheater inlet is within the design range, the flue gas has a strong ability to carry fly ash, and the fly ash will not be deposited between the air preheater heat exchange elements. The air preheater anti-ash blocking system is in a self-sustaining state and does not require automatic adjustment. When the lower boiler enters the deep peak-shaving state from normal operation, that is, when it operates at less than 50% of the rated load, the boiler flue gas flow is small, the flue gas velocity at the air preheater inlet will be lower than the design range, and the fly ash in the flue gas will be deposited between the air preheater heat exchange elements due to the low velocity. After receiving the 50% rated load condition operation signal sent by the lower boiler, the control device sends a command signal, and the first rotating actuator and the second rotating actuator receive the signal and send a command to drive the first guide contraction plate and the second guide contraction plate in the air preheater inlet flue to swing at a specified angle, ultimately reducing the actual flow area of ​​the air preheater inlet flue, increasing the flue gas velocity, and enhancing the ability of the flue gas to carry fly ash, so that the fly ash will not be deposited between the air preheater heat exchange elements or carry away the partially deposited fly ash. When the lower boiler enters the normal operation condition from the deep peak-shaving state, the control device sends a command signal after receiving the ≧50% rated load signal, and the first rotating actuator and the second rotating actuator receive the signal and send a command to drive the first guide contraction plate and the second guide contraction plate in the air preheater inlet flue to return to the initial position and enter the self-maintaining state.

[0041] Further, such as Figure 3As shown, the guide regulating device 1 also includes a third guide device 13 and a fourth guide device 14, the third guide device 13 includes a third guide contraction plate 131 arranged at one side of the air preheater inlet flue and arranged side by side with the first fixed guide plate 112, a third fixed guide plate 132 arranged at one side of the air preheater inlet flue and located below the third guide contraction plate 131, and a third fixed guide plate 132 connected to the third guide contraction plate 131 and used to drive the third guide contraction plate 131 to rotate counterclockwise and swing at a specified angle so that the third guide contraction plate 131 is respectively aligned with the first fixed guide plate 112 and the third fixed guide plate 13 2; the fourth guide device 14 includes a fourth guide contraction plate 141 arranged at the other side of the inlet flue of the air preheater 3 and corresponding to the third guide contraction plate 131, a fourth fixed guide plate 142 arranged at the other side of the inlet flue of the air preheater 3 and corresponding to the third fixed guide plate 132, and a fourth rotation actuator 1 connected to the fourth guide contraction plate 141 and used to drive the fourth guide contraction plate 141 to rotate clockwise and swing at a specified angle so that the fourth guide contraction plate 141 is respectively connected to the second fixed guide plate 122 and the fourth fixed guide plate 142 43; the fourth guide contraction plate 141 is arranged side by side with the second fixed guide plate 122, and the fourth fixed guide plate 142 is located below the fourth guide contraction plate 141; the third rotation actuator 133 and the fourth rotation actuator 143 are both connected to the control device 2, and the control device 3 is also used to control the third rotation actuator 133 to drive the third guide contraction plate 131 to rotate counterclockwise and swing at a specified angle according to the boiler ≦50% rated load operation signal sent by the boiler so that the third guide contraction plate 131 is respectively aligned with the first fixed guide plate 112 and the third fixed guide plate 1 32 is connected and used to control the fourth rotating actuator 143 to drive the fourth guide contraction plate 141 to rotate clockwise and swing at a specified angle so that the fourth guide contraction plate 141 is respectively connected to the second fixed guide plate 112 and the fourth fixed guide plate 142; the distance between the first fixed guide plate 112 and the second fixed guide plate 122 is greater than the distance between the third guide contraction plate 131 and the fourth guide contraction plate 141; the distance between the third guide contraction plate 131 and the fourth guide contraction plate 141 is greater than the distance between the third fixed guide plate 132 and the fourth fixed guide plate 142.

[0042] In specific operation, when the first rotating actuator 113 drives the first guide contraction plate 111 to rotate counterclockwise and swing at a specified angle so that the first guide contraction plate 11 is connected to the first fixed guide plate 112, and the third rotating actuator 132 drives the third guide contraction plate 131 to rotate counterclockwise and swing at a specified angle so that the third guide contraction plate 131 is connected to the first fixed guide plate 112 and the third fixed guide plate 132 respectively, the first guide contraction plate 111 and the third guide contraction plate 131 are in the same straight line. When the second rotating actuator 123 drives the second guide contraction plate 121 to rotate clockwise and swing at a specified angle so that the second guide contraction plate 121 is connected to the second fixed guide plate 122, and the fourth rotating actuator 143 drives the fourth guide contraction plate 141 to rotate clockwise and swing at a specified angle so that the fourth guide contraction plate 141 is respectively connected to the second fixed guide plate 122 and the fourth fixed guide plate 142, the second guide contraction plate 121 and the fourth guide contraction plate 141 are on the same straight line.

[0043] Furthermore, the guide regulating device 1 also includes a fifth guide device 15 and a sixth guide device 16, the fifth guide device 15 includes a fifth guide contraction plate 151 arranged on one side of the inlet flue of the air preheater 3 and arranged side by side with the third fixed guide plate 132, a fifth fixed guide plate 152 arranged on one side of the inlet flue of the air preheater 3 and located below the fifth guide contraction plate 151, and a fifth fixed guide plate 152 connected to the fifth guide contraction plate 151 and used to drive the fifth guide contraction plate 151 to rotate counterclockwise and swing at a specified angle so that the fifth guide contraction plate 151 is respectively aligned with the third fixed guide plate 132 and the fifth fixed guide plate 132. The sixth guide device 16 includes a sixth guide contraction plate 161 arranged at the other side of the inlet flue of the air preheater 3 and corresponding to the fifth guide contraction plate 151, a sixth fixed guide plate 162 arranged at the other side of the inlet flue of the air preheater 3 and corresponding to the fifth fixed guide plate 152, and a sixth rotating actuator 153 connected to the sixth guide contraction plate 161 and used to drive the sixth guide contraction plate 161 to rotate clockwise and swing at a specified angle so that the sixth guide contraction plate 161 is respectively connected to the fourth fixed guide plate 142 and the sixth fixed guide plate 162. The sixth guide contraction plate 161 is arranged side by side with the fourth fixed guide plate 142, and the sixth fixed guide plate 162 is located below the sixth guide contraction plate 161; the fifth rotation actuator 153 and the sixth rotation actuator 163 are both connected to the control device 2, and the control device 2 is also used to control the fifth rotation actuator 153 to drive the fifth guide contraction plate 151 to rotate counterclockwise and swing at a specified angle according to the boiler ≦50% rated load operation signal sent by the boiler so that the fifth guide contraction plate 151 is respectively aligned with the third fixed guide plate 132 and the fifth fixed guide plate 132. 152 is connected and used to control the sixth rotating actuator 163 to drive the sixth guide contraction plate 161 to rotate clockwise and swing at a specified angle so that the sixth guide contraction plate 161 is respectively connected to the fourth fixed guide plate 142 and the sixth fixed guide plate 162; the distance between the third fixed guide plate 132 and the fourth fixed guide plate 142 is greater than the distance between the fifth guide contraction plate 151 and the sixth guide contraction plate 161; the distance between the fifth guide contraction plate 151 and the sixth guide contraction plate 161 is greater than the distance between the fifth fixed guide plate 152 and the sixth fixed guide plate 162.

[0044] In specific operation, when the first rotating actuator 113 drives the first guide contraction plate 111 to rotate counterclockwise and swing at a specified angle so that the first guide contraction plate 111 is connected to the first fixed guide plate 112, the third rotating actuator 133 drives the third guide contraction plate 131 to rotate counterclockwise and swing at a specified angle so that the third guide contraction plate 131 is respectively connected to the first fixed guide plate 112 and the third fixed guide plate 132, and the fifth rotating actuator 153 drives the fifth guide contraction plate 15 to rotate counterclockwise and swing at a specified angle so that the fifth guide contraction plate 151 is respectively connected to the third fixed guide plate 132 and the fifth fixed guide plate 152, the first guide contraction plate 111, the third guide contraction plate 131 and the fifth guide contraction plate 151 are in the same straight line. line; when the second rotating actuator 123 drives the second guide contraction plate 121 to rotate clockwise and swing at a specified angle so that the second guide contraction plate 121 is connected to the second fixed guide plate 122, the fourth rotating actuator 143 drives the fourth guide contraction plate 141 to rotate clockwise and swing at a specified angle so that the fourth guide contraction plate 141 is respectively connected to the second fixed guide plate 122 and the fourth fixed guide plate 142, and the sixth rotating actuator 163 drives the sixth guide contraction plate 161 to rotate clockwise and swing at a fixed angle so that the sixth guide contraction plate 161 is respectively connected to the fourth fixed guide plate 142 and the sixth fixed guide plate 162, the second guide contraction plate 121, the fourth guide contraction plate 141 and the sixth guide contraction plate 161 are on the same straight line. In the present invention, the third rotation actuator 133 drives the third guide contraction plate 131 to rotate counterclockwise and swing at a specified angle within the range of 0°-30°; the fifth rotation actuator 153 drives the fifth guide contraction plate 151 to rotate counterclockwise and swing at a specified angle within the range of 0°-30°; the fourth rotation actuator 143 drives the fourth guide contraction plate 141 to rotate clockwise and swing at a specified angle within the range of 0°-30°; the sixth rotation actuator 163 drives the sixth guide contraction plate 161 to rotate clockwise and swing at a specified angle within the range of 0°-30°. The third rotation actuator 133, the fourth rotation actuator 143, the fifth rotation actuator 153 and the sixth rotation actuator 163 are all electric drive mechanisms; or the third rotation actuator 133, the fourth rotation actuator 143, the fifth rotation actuator 153 and the sixth rotation actuator 163 are all pneumatic drive mechanisms.

[0045] The automatic adjustment device for preventing ash blockage in the air preheater of a boiler under deep peak regulation of the present invention is adapted to set at least one flow guide adjustment device so that the flue gas flow rate under deep peak regulation reaches the designed range, the fly ash carrying capacity is enhanced, ash blockage in the air preheater is avoided, the heat exchange process of the air preheater is strengthened, and the differential pressure of the air preheater is reduced, thereby significantly improving the operating safety and economy of the entire boiler. In addition, the entire adjustment method associates the flow guide contraction plate with the load, and the adjustment process adopts an automatic control method, which reduces the labor intensity of the operating personnel.

[0046] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. An automatic adjustment device for preventing ash blockage in boiler air preheater under deep peak regulation, characterized in that: It includes: The guide regulating device comprises a first guide device and a second guide device, wherein the first guide device comprises a first guide contraction plate arranged at one side of the air preheater inlet flue, a first fixed guide plate arranged at one side of the air preheater inlet flue and below the first guide contraction plate, and a first rotating actuator connected to the first guide contraction plate and used to drive the first guide contraction plate to rotate counterclockwise and swing at a specified angle so that the first guide contraction plate is connected to the first fixed guide plate; the second guide device comprises a second guide contraction plate arranged at the other side of the air preheater inlet flue and corresponding to the first guide contraction plate, a second fixed guide plate arranged at the other side of the air preheater inlet flue and corresponding to the first fixed guide plate, and a second rotating actuator connected to the second guide contraction plate and used to drive the second guide contraction plate to rotate clockwise and swing at a specified angle so that the second guide contraction plate is connected to the second fixed guide plate; the distance between the first guide contraction plate and the second guide contraction plate is greater than the distance between the first fixed guide plate and the second fixed guide plate; A control device is respectively connected to the first rotating actuator and the second rotating actuator and is used to control the first rotating actuator to drive the first guide retraction plate to rotate counterclockwise and swing at a specified angle so that the first guide retraction plate is connected to the first fixed guide plate according to the boiler ≦50% rated load operation signal sent by the boiler, and is used to control the second rotating actuator to drive the second guide retraction plate to rotate clockwise and swing at a specified angle so that the second guide retraction plate is connected to the second fixed guide plate.

2. The automatic adjustment device for preventing ash blockage in boiler air preheater under deep peak load regulation according to claim 1 is characterized in that: The first rotation actuator drives the first guide contraction plate to rotate counterclockwise and swing at a specified angle within a range of 0°-30°; The second rotation actuator drives the second guide contraction plate to rotate clockwise and swing at a specified angle within a range of 0°-30°.

3. The automatic adjustment device for preventing ash blockage in boiler air preheater under deep peak load regulation according to claim 1 is characterized in that: The first rotation actuator and the second rotation actuator are both electric drive mechanisms; or, the first rotation actuator and the second rotation actuator are both pneumatic drive mechanisms.

4. The automatic adjustment device for preventing ash blockage in boiler air preheater under deep peak load regulation according to claim 1 is characterized in that: The control device includes an industrial computer connected to the first rotation actuator and the second rotation actuator respectively, and a signal receiving device connected to the industrial computer.

5. The automatic adjustment device for preventing ash blockage in boiler air preheater under deep peak load regulation according to claim 1 is characterized in that: The guide regulating device also includes a third guide device and a fourth guide device, the third guide device including a third guide contraction plate arranged on one side of the air preheater inlet flue and arranged side by side with the first fixed guide plate, a third fixed guide plate arranged on one side of the air preheater inlet flue and located below the third guide contraction plate, a third rotating actuator connected to the third guide contraction plate and used to drive the third guide contraction plate to rotate counterclockwise and swing at a specified angle so that the third guide contraction plate is respectively connected to the first fixed guide plate and the third fixed guide plate; the fourth guide device includes a fourth guide contraction plate arranged on the other side of the air preheater inlet flue and corresponding to the third guide contraction plate, a fourth fixed guide plate arranged on the other side of the air preheater inlet flue and corresponding to the third fixed guide plate, and a third rotating actuator connected to the third guide contraction plate and used to drive the third guide contraction plate to rotate counterclockwise and swing at a specified angle so that the third guide contraction plate is respectively connected to the first fixed guide plate and the third fixed guide plate. The control device is further configured to control the third rotating actuator to drive the third flow guide contraction plate to rotate counterclockwise and swing at a specified angle so that the third flow guide contraction plate is respectively connected to the first fixed flow guide plate and the third fixed flow guide plate according to the boiler ≦50% rated load operation signal sent by the boiler, and to control the fourth rotating actuator to drive the fourth flow guide contraction plate to rotate clockwise and swing at a specified angle so that the fourth flow guide contraction plate is respectively connected to the second fixed flow guide plate and the fourth fixed flow guide plate; the third rotating actuator and the fourth rotating actuator are both connected to the control device, and the control device is also configured to control the third rotating actuator to drive the third flow guide contraction plate to rotate counterclockwise and swing at a specified angle so that the third flow guide contraction plate is respectively connected to the first fixed flow guide plate and the third fixed flow guide plate according to the boiler ≦50% rated load operation signal sent by the boiler, and to control the fourth rotating actuator to drive the fourth flow guide contraction plate to rotate clockwise and swing at a specified angle so that the fourth flow guide contraction plate is respectively connected to the second fixed flow guide plate and the fourth fixed flow guide plate; The distance between the first fixed guide plate and the second fixed guide plate is greater than the distance between the third guide contraction plate and the fourth guide contraction plate; The distance between the third flow guide contraction plate and the fourth flow guide contraction plate is greater than the distance between the third fixed flow guide plate and the fourth fixed flow guide plate.

6. The automatic adjustment device for preventing ash blockage in boiler air preheater under deep peak load regulation according to claim 5 is characterized in that: When the first rotation actuator drives the first guide contraction plate to rotate counterclockwise and swing at a specified angle so that the first guide contraction plate is connected to the first fixed guide plate, and the third rotation actuator drives the third guide contraction plate to rotate counterclockwise and swing at a specified angle so that the third guide contraction plate is connected to the first fixed guide plate and the third fixed guide plate respectively, the first guide contraction plate and the third guide contraction plate are on the same straight line; When the second rotating actuator drives the second guide retraction plate to rotate clockwise and swing at a specified angle so that the second guide retraction plate is connected to the second fixed guide plate, and the fourth rotating actuator drives the fourth guide retraction plate to rotate clockwise and swing at a specified angle so that the fourth guide retraction plate is respectively connected to the second fixed guide plate and the fourth fixed guide plate, the second guide retraction plate and the fourth guide retraction plate are on the same straight line.

7. The automatic adjustment device for preventing ash blockage in boiler air preheater under deep peak load regulation according to claim 5 is characterized in that: The guide regulating device also includes a fifth guide device and a sixth guide device, the fifth guide device including a fifth guide contraction plate arranged on one side of the air preheater inlet flue and arranged side by side with the third fixed guide plate, a fifth fixed guide plate arranged on one side of the air preheater inlet flue and located below the fifth guide contraction plate, a fifth rotating actuator connected to the fifth guide contraction plate and used to drive the fifth guide contraction plate to rotate counterclockwise and swing at a specified angle so that the fifth guide contraction plate is respectively connected to the third fixed guide plate and the fifth fixed guide plate; the sixth guide device includes a sixth guide contraction plate arranged on the other side of the air preheater inlet flue and corresponding to the fifth guide contraction plate, a sixth fixed guide plate arranged on the other side of the air preheater inlet flue and corresponding to the fifth fixed guide plate, and a fifth rotating actuator connected to the fifth guide contraction plate and used to drive the fifth guide contraction plate to rotate counterclockwise and swing at a specified angle so that the fifth guide contraction plate is respectively connected to the third fixed guide plate and the fifth fixed guide plate. The control device further comprises a sixth rotating actuator connected to the flow contraction plate and used to drive the sixth flow guide contraction plate to rotate clockwise and swing at a specified angle so that the sixth flow guide contraction plate is respectively connected to the fourth fixed flow guide plate and the sixth fixed flow guide plate; the fifth rotating actuator and the sixth rotating actuator are both connected to the control device, and the control device is also used to control the fifth rotating actuator to drive the fifth flow guide contraction plate to rotate counterclockwise and swing at a specified angle according to the boiler ≦50% rated load operation signal sent by the boiler so that the fifth flow guide contraction plate is respectively connected to the third fixed flow guide plate and the fifth fixed flow guide plate, and to control the sixth rotating actuator to drive the sixth flow guide contraction plate to rotate clockwise and swing at a specified angle so that the sixth flow guide contraction plate is respectively connected to the fourth fixed flow guide plate and the sixth fixed flow guide plate; The distance between the third fixed guide plate and the fourth fixed guide plate is greater than the distance between the fifth guide contraction plate and the sixth guide contraction plate; The distance between the fifth guide contraction plate and the sixth guide contraction plate is greater than the distance between the fifth fixed guide plate and the sixth fixed guide plate.

8. The automatic adjustment device for preventing ash blockage in boiler air preheater under deep peak load regulation according to claim 7 is characterized in that: When the first rotating actuator drives the first guide contraction plate to rotate counterclockwise and swing at a specified angle so that the first guide contraction plate is connected to the first fixed guide plate, the third rotating actuator drives the third guide contraction plate to rotate counterclockwise and swing at a specified angle so that the third guide contraction plate is respectively connected to the first fixed guide plate and the third fixed guide plate, and the fifth rotating actuator drives the fifth guide contraction plate to rotate counterclockwise and swing at a specified angle so that the fifth guide contraction plate is respectively connected to the third fixed guide plate and the fifth fixed guide plate, the first guide contraction plate, the third guide contraction plate and the fifth guide contraction plate are on the same straight line; When the second rotating actuator drives the second guide contraction plate to rotate clockwise and swing at a specified angle so that the second guide contraction plate is connected to the second fixed guide plate, the fourth rotating actuator drives the fourth guide contraction plate to rotate clockwise and swing at a specified angle so that the fourth guide contraction plate is respectively connected to the second fixed guide plate and the fourth fixed guide plate, and the sixth rotating actuator drives the sixth guide contraction plate to rotate clockwise and swing at a fixed angle so that the sixth guide contraction plate is respectively connected to the fourth fixed guide plate and the sixth fixed guide plate, the second guide contraction plate, the fourth guide contraction plate and the sixth guide contraction plate are on the same straight line.

9. The automatic adjustment device for preventing ash blockage in boiler air preheater under deep peak load regulation according to claim 8 is characterized in that: The third rotation actuator drives the third guide contraction plate to rotate counterclockwise and swing at a specified angle within a range of 0°-30°; The fifth rotation actuator drives the fifth guide contraction plate to rotate counterclockwise and swing at a specified angle within a range of 0°-30°; The fourth rotation actuator drives the fourth guide contraction plate to rotate clockwise and swing at a specified angle within a range of 0°-30°; The sixth rotation actuator drives the sixth guide contraction plate to rotate clockwise and swing at a specified angle within a range of 0°-30°.

10. The automatic adjustment device for preventing ash blockage in boiler air preheater under deep peak load regulation according to claim 8, characterized in that: The third rotation actuator, the fourth rotation actuator, the fifth rotation actuator and the sixth rotation actuator are all electric drive mechanisms; or, the third rotation actuator, the fourth rotation actuator, the fifth rotation actuator and the sixth rotation actuator are all pneumatic drive mechanisms.

Images