Low-temperature economizer operation monitoring and flexible adjusting system and method

Abstract

The invention discloses a low-temperature economizer operation monitoring and flexible adjusting system and method. An outlet of a low-temperature economizer inlet large header communicates with an inlet of a low-temperature economizer middle confluence header through a low-temperature section inlet header, a low-temperature section module of a low-temperature economizer and a low-temperature section outlet header; an outlet of the low-temperature economizer inlet large header is communicated with an inlet of the low-temperature economizer middle confluence header through a low-temperature section module bypass; an outlet of the low-temperature economizer middle confluence collecting box is communicated with an inlet of a low-temperature economizer outlet large collecting box through a high-temperature section inlet collecting box, a low-temperature economizer high-temperature section module and a high-temperature section outlet collecting box, and an outlet of the low-temperature economizer middle confluence collecting box is communicated with an inlet of the low-temperature economizer outlet large collecting box through a high-temperature section module bypass. According to the system and method, the operation condition of the low-temperature economizer system can be monitored online and flexibly adjusted, and the service life of the low-temperature economizer system is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of power station boiler flue gas waste heat recovery, and relates to a low-temperature economizer operation monitoring and flexible adjustment system and method. Background Art

[0002] Low-temperature economizers are prone to problems such as wear and corrosion of the heating surface, ash accumulation and blockage, and leakage of heat exchange tubes during actual operation. Once a problem occurs, it will cause the dust collector to be blocked, reduce the efficiency of the dust collector, and reduce the load capacity of the unit. It is difficult to monitor and judge the problem online after the low-temperature economizer has a problem, and it is impossible to control it during operation. In most cases, it needs to be repaired after the unit is shut down. In order to monitor the operation of the low-temperature economizer online, it can be processed online in time after the problem module is detected, and the operation of the low-temperature economizer system can be flexibly adjusted to inhibit the development of problems such as ash accumulation and blockage on the heating surface, extend the service life of the low-temperature economizer, and ensure the long-term safe and reliable operation of the low-temperature economizer. It is necessary to develop a low-temperature economizer operation monitoring and flexible adjustment system. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and to provide a low-temperature economizer operation monitoring and flexible adjustment system and method, which can monitor the operation status of the low-temperature economizer system online and flexibly adjust it, thereby extending the service life of the low-temperature economizer system.

[0004] To achieve the above-mentioned purpose, the low-temperature economizer operation monitoring and flexible adjustment system of the present invention includes a low-temperature economizer inlet header, a low-temperature economizer intermediate converging header, a low-temperature economizer outlet header, a plurality of high-temperature section modules and a plurality of low-temperature section modules, wherein the high-temperature section module includes a high-temperature section inlet header, a low-temperature economizer high-temperature section module, a high-temperature section outlet header and a low-temperature economizer outlet header; the low-temperature section module includes a low-temperature section inlet header, a low-temperature economizer low-temperature section module, a low-temperature section outlet header and a low-temperature economizer inlet header;

[0005] The outlet of the low-temperature economizer inlet large header is connected to the inlet of the low-temperature economizer intermediate merging header via the low-temperature section inlet header, the low-temperature section module of the low-temperature economizer and the low-temperature section outlet header, and the outlet of the low-temperature economizer inlet large header is connected to the inlet of the low-temperature economizer intermediate merging header via the low-temperature section module bypass; the outlet of the low-temperature economizer intermediate merging header is connected to the inlet of the low-temperature economizer outlet large header via the high-temperature section inlet header, the high-temperature section module of the low-temperature economizer and the high-temperature section outlet header, and the outlet of the low-temperature economizer intermediate merging header is connected to the inlet of the low-temperature economizer outlet large header via the high-temperature section module bypass;

[0006] An acoustic soot blower is arranged between the high temperature section module of the low temperature economizer and the low temperature section module of the low temperature economizer.

[0007] Furthermore, a low-temperature section module bypass electric isolation valve is provided on the low-temperature section module bypass;

[0008] The high temperature section module bypass is provided with a high temperature section module bypass electric isolation valve.

[0009] Furthermore, a low-temperature economizer inlet large header electric isolation valve is provided at the inlet of the low-temperature economizer inlet large header;

[0010] A low-temperature economizer outlet large header electric isolation valve is provided at the outlet of the low-temperature economizer outlet large header.

[0011] Furthermore, the low temperature section module further comprises a low temperature section inlet header electric isolation valve, and the low temperature section inlet header electric isolation valve is arranged at the inlet of the low temperature section inlet header;

[0012] The high temperature section module also includes a high temperature section inlet header electric isolation valve, which is arranged at the inlet of the high temperature section inlet header.

[0013] Furthermore, the low-temperature section module also includes a low-temperature section outlet manifold electric isolation valve, a low-temperature section pressure measuring point and a low-temperature section water temperature measuring point. The low-temperature section outlet manifold electric isolation valve is arranged at the outlet of the low-temperature section outlet manifold, and the low-temperature section pressure measuring point and the low-temperature section water temperature measuring point are arranged in the low-temperature section outlet manifold.

[0014] Furthermore, the high temperature section module also includes a high temperature section outlet manifold electric isolation valve, a high temperature section pressure measuring point and a high temperature section water temperature measuring point. The high temperature section outlet manifold electric isolation valve is arranged at the outlet of the high temperature section outlet manifold, and the high temperature section pressure measuring point and the high temperature section water temperature measuring point are arranged in the high temperature section outlet manifold.

[0015] Furthermore, it also includes an upper frame structure and a lower frame structure, the high temperature section module of the low temperature economizer is arranged on the upper frame structure, and the low temperature section module of the low temperature economizer is arranged on the lower frame structure.

[0016] Furthermore, a high-temperature section header hand hole is provided on the high-temperature section outlet header.

[0017] Furthermore, a low-temperature section header hand hole is provided on the low-temperature section outlet header.

[0018] The low-temperature economizer operation monitoring and flexible adjustment method of the present invention comprises the following steps:

[0019] In the early stage of low-temperature economizer, at different load points of the unit, the measured data of each high-temperature section water temperature measuring point and each low-temperature section water temperature measuring point are obtained, and the measured data of each high-temperature section water temperature measuring point and each low-temperature section water temperature measuring point are used as the reference value;

[0020] When the low-temperature economizer is actually in operation, the measured values ​​of each high-temperature section water temperature measuring point and each low-temperature section water temperature measuring point under each load point are obtained, and the measured values ​​are compared with the reference values. When the decrease of the measured value relative to the reference value exceeds the preset amplitude value, the high-temperature section module or the low-temperature section module corresponding to the measured value is regarded as the problem module;

[0021] Close the high-temperature section inlet header electric isolation valve and the high-temperature section outlet header electric isolation valve or the low-temperature section inlet header electric isolation valve and the low-temperature section outlet header electric isolation valve in the problem module, observe the pressure value of the high-temperature section pressure measuring point or the low-temperature section pressure measuring point, when the pressure value drops by more than the preset pressure value, it is considered that the problem module may be leaking, then maintain the status quo and isolate the problem module, otherwise, it is considered that the problem module is not leaking, and it is necessary to perform online soot blowing adjustment of the low-temperature economizer, at this time, the problem module is soot blown by a sonic soot blower;

[0022] At preset intervals, close the high-temperature section inlet header electric isolation valve and the high-temperature section outlet header electric isolation valve or the low-temperature section inlet header electric isolation valve and the low-temperature section outlet header electric isolation valve in the problem module, so that the problem module is in a dry-burning state, and observe the changes in the outlet water temperature of the problem module and the changes in the overall resistance of the low-temperature economizer;

[0023] When the overall resistance of the low-temperature economizer is higher than the preset resistance, all the high-temperature section modules and low-temperature section modules of the low-temperature economizers will be shut down respectively, so that the problem modules are in a dry burning state, and the overall resistance change of the low-temperature economizer will be observed. Close the electric isolation valves of the high-temperature section inlet headers and the electric isolation valves of the high-temperature section outlet headers, open the bypass electric isolation valves of the high-temperature section modules, and shut down all the high-temperature section modules of the low-temperature economizers; close the electric isolation valves of the low-temperature section inlet headers and the electric isolation valves of the low-temperature section outlet headers, open the bypass electric isolation valves of the low-temperature section modules, and shut down all the low-temperature section modules of the low-temperature economizers.

[0024] The present invention has the following beneficial effects:

[0025] The low-temperature economizer operation monitoring and flexible adjustment system and method described in the present invention, during specific operation, compares the actual water temperature operation data of each module outlet at each load point with the reference value, so as to monitor the operation of the low-temperature economizer online and find the problem module in time; through the pressure measuring point of each module outlet manifold, the low-temperature economizer module is detected online to determine whether each module is leaking, isolate the possible leaking module, and perform online soot blowing adjustment on the non-leaking module; secondly, the operation of the low-temperature economizer module is adjusted, the problem module is withdrawn from operation alone or the high-temperature section module of the low-temperature economizer and the low-temperature section module of the low-temperature economizer are withdrawn from operation as a whole, and the development of problems such as ash blockage on the heating surface is suppressed by maintaining the "dry burning" state for a certain period of time, and the resistance of the heating surface is prevented from increasing too quickly. The system is simple, can monitor the operation of the low-temperature economizer online, flexibly adjust the operation of the low-temperature economizer system, extend the service life of the low-temperature economizer, and ensure the long-term safe and reliable operation of the low-temperature economizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] Figure 2 It is a schematic diagram of the arrangement of the present invention.

[0029] Among them, 1 is the high temperature section module of the low temperature economizer, 2 is the high temperature section inlet header, 201 is the electric isolation valve of the high temperature section inlet header, 3 is the high temperature section outlet header, 301 is the electric isolation valve of the high temperature section outlet header, 302 is the high temperature section pressure measuring point, 303 is the high temperature section water temperature measuring point, 304 is the high temperature section header hand hole, 4 is the low temperature section module of the low temperature economizer, 5 is the low temperature section inlet header, 501 is the electric isolation valve of the low temperature section inlet header, 6 is the low temperature section outlet header, 601 is the electric isolation valve of the low temperature section outlet header, 602 is the low temperature section pressure measuring point, 603 is the low-temperature section water temperature measuring point, 604 is the low-temperature section manifold hand hole, 7 is the low-temperature economizer inlet large manifold, 701 is the low-temperature economizer inlet large manifold electric isolation valve, 8 is the low-temperature economizer intermediate converging manifold, 9 is the low-temperature economizer outlet large manifold, 901 is the low-temperature economizer outlet large manifold electric isolation valve, 10 is the low-temperature section module bypass, 1001 is the low-temperature section module bypass electric isolation valve, 11 is the high-temperature section module bypass, 1101 is the high-temperature section module bypass electric isolation valve, 12 is the sonic soot blower, 13 is the upper frame structure, and 14 is the lower frame structure. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0032] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0033] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0034] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0035] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0038] refer to Figure 1 and Figure 2 The low-temperature economizer operation monitoring and flexible adjustment system of the present invention comprises a low-temperature economizer inlet large header 7, a low-temperature economizer intermediate converging header 8, a low-temperature section module bypass 10, a high-temperature section module bypass 11, a low-temperature economizer outlet large header 9, a plurality of high-temperature section modules and a plurality of low-temperature section modules, wherein each high-temperature section module comprises a high-temperature section inlet header electric isolation valve 201, a high-temperature section outlet header electric isolation valve 301, a high-temperature section pressure measuring point 302, a high-temperature section water temperature measuring point 303, a low-temperature economizer high-temperature section module 1, a high-temperature section inlet header 2 and a high-temperature section outlet header 3; the low-temperature section modules comprise a low-temperature section inlet header electric isolation valve 501, a low-temperature section outlet header electric isolation valve 601, a low-temperature section pressure measuring point 602, a low-temperature section water temperature measuring point 603, a low-temperature economizer low-temperature section module 4, a low-temperature section inlet header 5 and a low-temperature section outlet header 6;

[0039] The outlet of the low-temperature economizer inlet header 7 is connected to the inlet of the low-temperature economizer intermediate junction header 8 via the low-temperature section inlet header 5, the low-temperature section module 4 of the low-temperature economizer and the low-temperature section outlet header 6. The outlet of the low-temperature economizer inlet header 7 is connected to the inlet of the low-temperature economizer intermediate junction header 8 via the low-temperature section module bypass 10. The low-temperature section module bypass 10 is provided with a low-temperature section module bypass electric isolation valve 1001; the inlet of the low-temperature economizer inlet header 7 is provided with a low-temperature economizer inlet header electric isolation valve 701.

[0040] The low-temperature section inlet manifold electric isolation valve 501 is arranged at the inlet of the low-temperature section inlet manifold 5; the low-temperature section outlet manifold electric isolation valve 601 is arranged at the outlet of the low-temperature section outlet manifold 6, and the low-temperature section pressure measuring point 602 and the low-temperature section water temperature measuring point 603 are arranged in the low-temperature section outlet manifold 6.

[0041] The outlet of the low-temperature economizer intermediate junction box 8 is connected to the inlet of the low-temperature economizer outlet large header 9 via the high-temperature section inlet header 2, the low-temperature economizer high-temperature section module 1 and the high-temperature section outlet header 3, and the outlet of the low-temperature economizer intermediate junction box 8 is connected to the inlet of the low-temperature economizer outlet large header 9 via the high-temperature section module bypass 11.

[0042] The high temperature section module bypass 11 is provided with a high temperature section module bypass electric isolation valve 1101, the high temperature section inlet manifold electric isolation valve 201 is arranged at the inlet of the high temperature section inlet manifold 2, the high temperature section pressure measuring point 302 and the high temperature section water temperature measuring point 303 are arranged on the high temperature section outlet manifold 3, the high temperature section outlet manifold electric isolation valve 301 is arranged at the outlet of the high temperature section outlet manifold 3, and the low temperature economizer outlet large manifold electric isolation valve 901 is arranged at the outlet of the low temperature economizer outlet large manifold 9.

[0043] The high temperature section module 1 of the low temperature economizer is arranged on the upper frame structure 13, and the low temperature section module 4 of the low temperature economizer is arranged on the lower frame structure 14. A high temperature section manifold hand hole 304 is provided on the high temperature section outlet manifold 3; a low temperature section manifold hand hole 604 is provided on the low temperature section outlet manifold 6, and an acoustic soot blower 12 is arranged between the high temperature section module 1 of the low temperature economizer and the low temperature section module 4 of the low temperature economizer. The acoustic soot blower 12 adopts frequency conversion control, and one acoustic soot blower 12 corresponds to one high temperature section module 1 of the low temperature economizer and one low temperature section module 4 of the low temperature economizer.

[0044] refer to Figure 1 and Figure 2 The low-temperature economizer operation monitoring and flexible adjustment method of the present invention comprises the following steps:

[0045] Three months after the low-temperature economizer was put into operation for the first time, the data measured at the water temperature measuring points 303 of each high-temperature section and the water temperature measuring points 603 of each low-temperature section were obtained at eight load points of the unit, namely BMCR, 90%BMCR, 80%BMCR, 70%BMCR, 60%BMCR, 50%BMCR and 40%BMCR, and were recorded as load points (GT1, GT2, GT3, GT4, GT5, GT6, GT7, GT8) and load points (DT1, DT2, DT3, DT4, DT5, DT6, DT7, DT8) as benchmark values ​​for operation monitoring.

[0046] When the low-temperature economizer is actually in operation, the data of each high-temperature section water temperature measuring point 303 and each low-temperature section water temperature measuring point 603 under each load point are obtained and compared with the load points (GT1, GT2, GT3, GT4, GT5, GT6, GT7, GT8) and load points (DT1, DT2, DT3, DT4, DT5, DT6, DT7, DT8). When the water temperature measuring point data of any module drops by more than 10% compared with the baseline value of operation monitoring, an alarm is issued and the module is determined to be a problem module.

[0047] Online detection of low-temperature economizer module: close the high-temperature section inlet header electric isolation valve 201 and the high-temperature section outlet header electric isolation valve 301 or the low-temperature section inlet header electric isolation valve 501 and the low-temperature section outlet header electric isolation valve 601 of the problem module, and observe whether there is a significant change in the pressure value of the high-temperature section pressure measuring point 302 or the low-temperature section pressure measuring point 602. If there is a significant drop, the problem module may leak, then keep the status quo and isolate the problem module; if there is no significant drop, the problem module is not leaking, and the large drop in water temperature may be caused by ash accumulation and blockage in the low-temperature economizer, and perform online soot blowing adjustment of the low-temperature economizer.

[0048] Online soot blowing adjustment of low-temperature economizer: adjust the frequency of the sonic soot blower 12 corresponding to the problem module. The default operating frequency is 50Hz, the frequency adjustment range is 25-50Hz, and it is adjusted every 5Hz. Each operation time is 24h. Observe the changes in the outlet water temperature of the problem module and the overall resistance of the low-temperature economizer to determine the optimal operating frequency of the sonic soot blower 12 corresponding to the problem module; increase the soot blowing frequency to one cycle every 20 minutes.

[0049] Operation adjustment of low-temperature economizer module: close the high-temperature section inlet manifold electric isolation valve 201 and the high-temperature section outlet manifold electric isolation valve 301 or the low-temperature section inlet manifold electric isolation valve 501 and the low-temperature section outlet manifold electric isolation valve 601 of the problem module every week, keep the problem module in the "dry burning" state for 48 hours, and observe the changes in the outlet water temperature of the problem module and the overall resistance of the low-temperature economizer.

[0050] When the overall resistance of the low-temperature economizer is high, generally greater than 700Pa, all low-temperature economizer high-temperature section modules 1 and low-temperature section modules 4 will be shut down, and the "dry burning" state will be maintained for 48 hours to observe the overall resistance change of the low-temperature economizer. Close the electric isolation valve 201 of each high-temperature section inlet manifold and the electric isolation valve 301 of each high-temperature section outlet manifold, open the high-temperature section module bypass electric isolation valve 1101, and all low-temperature economizer high-temperature section modules 1 will be shut down; close the electric isolation valve 501 of each low-temperature section inlet manifold and the electric isolation valve 601 of each low-temperature section outlet manifold, open the low-temperature section module bypass electric isolation valve 1001, and all low-temperature section modules 4 of the low-temperature economizer will be shut down.

[0051] When the unit is shut down, open the high-temperature section header hand hole 304 and the low-temperature section header hand hole 604 to clean the dirt and debris in the header.

[0052] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0053] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0054] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A low-temperature economizer operation monitoring and flexible adjustment system, characterized in that: It comprises a low-temperature economizer intermediate merging header (8), a low-temperature economizer outlet header (9), a plurality of high-temperature section modules and a plurality of low-temperature section modules. The high-temperature section module comprises a high-temperature section inlet header (2), a low-temperature economizer high-temperature section module (1), a high-temperature section outlet header (3) and a low-temperature economizer outlet header (9); the low-temperature section module comprises a low-temperature section inlet header (5), a low-temperature economizer low-temperature section module (4), a low-temperature section outlet header (6) and a low-temperature economizer inlet header (7); The outlet of the low-temperature economizer inlet header (7) is connected to the inlet of the low-temperature economizer intermediate header (8) via the low-temperature section inlet header (5), the low-temperature section module (4) of the low-temperature economizer and the low-temperature section outlet header (6), and the outlet of the low-temperature economizer inlet header (7) is connected to the inlet of the low-temperature economizer intermediate header (8) via the low-temperature section module bypass (10); the outlet of the low-temperature economizer intermediate header (8) is connected to the inlet of the low-temperature economizer outlet header (9) via the high-temperature section inlet header (2), the low-temperature economizer high-temperature section module (1) and the high-temperature section outlet header (3), and the outlet of the low-temperature economizer intermediate header (8) is connected to the inlet of the low-temperature economizer outlet header (9) via the high-temperature section module bypass (11); A sonic soot blower (12) is arranged between the low-temperature economizer high-temperature section module (1) and the low-temperature economizer low-temperature section module (4).

2. The low-temperature economizer operation monitoring and flexible adjustment system according to claim 1 is characterized in that: The low-temperature section module bypass (10) is provided with a low-temperature section module bypass electric isolation valve (1001); The high temperature section module bypass (11) is provided with a high temperature section module bypass electric isolation valve (1101).

3. The low-temperature economizer operation monitoring and flexible adjustment system according to claim 2 is characterized in that: A low-temperature economizer inlet large header electric isolation valve (701) is provided at the inlet of the low-temperature economizer inlet large header (7); A low-temperature economizer outlet large header electric isolation valve (901) is provided at the outlet of the low-temperature economizer outlet large header (9).

4. The low-temperature economizer operation monitoring and flexible adjustment system according to claim 3 is characterized in that: The low temperature section module further comprises a low temperature section inlet header electric isolation valve (501), and the low temperature section inlet header electric isolation valve (501) is arranged at the inlet of the low temperature section inlet header (5); The high temperature section module further comprises a high temperature section inlet header electric isolation valve (201), and the high temperature section inlet header electric isolation valve (201) is arranged at the inlet of the high temperature section inlet header (2).

5. The low-temperature economizer operation monitoring and flexible adjustment system according to claim 4 is characterized in that: The low-temperature section module also includes a low-temperature section outlet manifold electric isolation valve (601), a low-temperature section pressure measuring point (602) and a low-temperature section water temperature measuring point (603). The low-temperature section outlet manifold electric isolation valve (601) is arranged at the outlet of the low-temperature section outlet manifold (6), and the low-temperature section pressure measuring point (602) and the low-temperature section water temperature measuring point (603) are arranged in the low-temperature section outlet manifold (6).

6. The low-temperature economizer operation monitoring and flexible adjustment system according to claim 5 is characterized in that: The high temperature section module further comprises a high temperature section outlet manifold electric isolation valve (301), a high temperature section pressure measuring point (302) and a high temperature section water temperature measuring point (303); the high temperature section outlet manifold electric isolation valve (301) is arranged at the outlet of the high temperature section outlet manifold (3); the high temperature section pressure measuring point (302) and the high temperature section water temperature measuring point (303) are arranged in the high temperature section outlet manifold (3).

7. The low-temperature economizer operation monitoring and flexible adjustment system according to claim 6 is characterized in that: It also includes an upper frame structure (13) and a lower frame structure (14), wherein the low-temperature economizer high-temperature section module (1) is arranged on the upper frame structure (13), and the low-temperature economizer low-temperature section module (4) is arranged on the lower frame structure (14).

8. The low-temperature economizer operation monitoring and flexible adjustment system according to claim 1 is characterized in that: The high-temperature section outlet header (3) is provided with a high-temperature section header hand hole (304).

9. The low-temperature economizer operation monitoring and flexible adjustment system according to claim 1, characterized in that: The low-temperature section outlet header (6) is provided with a low-temperature section header hand hole (604).

10. A method for monitoring and flexibly adjusting the operation of a low-temperature economizer, characterized in that: The low-temperature economizer operation monitoring and flexible adjustment system according to claim 7 comprises the following steps: At the initial stage of the low-temperature economizer, at different load points of the unit, the data measured by each high-temperature section water temperature measuring point (303) and each low-temperature section water temperature measuring point (603) are obtained, and the data measured by each high-temperature section water temperature measuring point (303) and each low-temperature section water temperature measuring point (603) are used as reference values; When the low-temperature economizer is actually in operation, the measured values ​​of each high-temperature section water temperature measuring point (303) and each low-temperature section water temperature measuring point (603) under each load point are obtained, and the measured values ​​are compared with the reference values. When the decrease of the measured value relative to the reference value exceeds a preset amplitude value, the high-temperature section module or the low-temperature section module corresponding to the measured value is regarded as a problem module; Close the high-temperature section inlet header electric isolation valve (201) and the high-temperature section outlet header electric isolation valve (301) or the low-temperature section inlet header electric isolation valve (501) and the low-temperature section outlet header electric isolation valve (601) in the problem module, observe the pressure value of the high-temperature section pressure measuring point (302) or the low-temperature section pressure measuring point (602), when the pressure value drops to exceed the preset pressure value, it is considered that the problem module may leak, then maintain the status quo and isolate the problem module, otherwise, it is considered that the problem module has not leaked, and it is necessary to perform online soot blowing adjustment of the low-temperature economizer, at this time, the problem module is soot blown by a sonic soot blower; At preset intervals, close the high temperature section inlet header electric isolation valve (201) and the high temperature section outlet header electric isolation valve (301) or the low temperature section inlet header electric isolation valve (501) and the low temperature section outlet header electric isolation valve (601) in the problem module, so that the problem module is in a dry burning state, and observe the change of the outlet water temperature of the problem module and the change of the overall resistance of the low temperature economizer; When the overall resistance of the low-temperature economizer is higher than the preset resistance, the high-temperature section modules (1) and the low-temperature section modules (4) of the low-temperature economizers are all shut down, so that the problem modules are in a dry burning state. The overall resistance change of the low-temperature economizer is observed, and the electric isolation valves (201) of the high-temperature section inlet headers and the electric isolation valves (301) of the high-temperature section outlet headers are closed, and the high-temperature section module bypass electric isolation valve (1101) is opened to shut down the high-temperature section modules (1) of the low-temperature economizers; the electric isolation valves (501) of the low-temperature section inlet headers and the electric isolation valves (601) of the low-temperature section outlet headers are closed, and the low-temperature section module bypass electric isolation valve (1001) is opened to shut down the low-temperature section modules (4) of the low-temperature economizers.

Images