A cross arrangement structure and method for combined flue regulating baffles

Abstract

The present invention discloses a cross-arrangement structure and method of a combined flue regulating baffle, including a partitioning flue compartment and an integrated regulating baffle, wherein the flue compartment is arranged at the outlet of each partitioning flue, and the partitioning flue compartment of each partitioning flue is provided with a plurality of sub-compartments along the width direction of the partitioning flue; the integrated regulating baffle is arranged at the outlet of the partitioning flue compartment and is located in the combined flue, and the integrated regulating baffle includes a plurality of compartment doors and adjacent compartment doors connect the sub-compartments of different upstream partitioning flue compartments. The method is to arrange a partitioning flue compartment at the outlet of each partitioning flue and divide it into a plurality of sub-compartments, and to arrange an integrated regulating baffle at the outlet of each partitioning flue compartment in the combined flue and divide it into a plurality of compartment doors, wherein the adjacent compartment doors are controlled to connect the sub-compartments of different upstream partitioning flue compartments. The present invention solves the problem of uneven flue gas temperature field after the upstream flue is combined and mixed and meets the requirements of efficient and safe operation of downstream equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of boiler equipment, and more particularly to a cross-arrangement structure and method for merging flue regulating baffles. Background Art

[0002] The tail-partitioned flue boiler that uses flue gas dampers to adjust the steam temperature is widely used. The tail flue with lower flue temperature is designed to be divided into two or three parallel separated flues. Convection heating surfaces are arranged in the separated flues. A flue gas regulating damper is separately set at the outlet of each separated flue. The flue gases from each path pass through the heating surface and the baffle and then merge into the combined flue. The flue gas share in the separated flue is controlled by the damper opening.

[0003] This design is mature and reliable, but there are differences in the outlet flue gas temperatures of each separated flue. After merging, it takes a long mixing distance to achieve uniform mixing, which may cause uneven temperature fields of downstream equipment (such as denitrification devices), resulting in the temperature of some temperature fields of downstream equipment (such as denitrification devices) failing to meet the normal operation of the equipment. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention proposes a cross-arrangement structure and method of a combined flue regulating baffle to solve the problem of uneven flue gas temperature field after the upstream flue ducts are combined and mixed and to meet the efficient and safe operation of downstream equipment.

[0005] The present invention provides a cross-arrangement structure of a combined flue regulating baffle, comprising a flue compartment and an integrated regulating baffle, wherein:

[0006] The smoke duct compartment is arranged at the outlet of each smoke duct, and the smoke duct compartment of each smoke duct is provided with a plurality of sub-chambers along the width direction of the smoke duct;

[0007] The integrated regulating baffle is arranged at the outlet of the compartment separating the flue and is located in the combined flue. The integrated regulating baffle comprises a plurality of compartment doors, and adjacent compartment doors are connected to sub-compartments of different upstream compartments separating the flue.

[0008] According to an embodiment of the cross-arrangement structure of the combined flue regulating baffles of the present invention, the number of the separated flues is 2 to 4 and each separated flue is connected to the combined flue through a separated flue compartment and an integrated regulating baffle.

[0009] According to an embodiment of the cross-arrangement structure of the combined flue regulating baffles of the present invention, the flue partition compartment of the separated flue is provided with 3 to 8 sub-compartments, and the sub-compartments in the flue partition compartment of the separated flue are not interconnected.

[0010] According to an embodiment of the cross-arrangement structure of the combined flue regulating baffles of the present invention, the sub-compartments of the flue partition compartments of each flue partition are arranged at intervals, and the sub-compartments of the flue partition compartments of adjacent flue partitions are arranged adjacent to each other.

[0011] According to an embodiment of the cross-arrangement structure of the integrated flue regulating baffles of the present invention, each compartment door of the sub-compartment connected to the same upstream separating flue compartment in the integrated regulating baffles is connected to the same actuator, and each compartment door of the sub-compartment connected to different upstream separating flue compartments in the integrated regulating baffles is connected to different actuators.

[0012] According to an embodiment of the present invention incorporating a cross-arrangement structure of flue regulating dampers, the actuator is connected to a compartment door integrated with the regulating dampers via a connecting rod and a transmission rod.

[0013] The present invention also provides a method for cross-arrangement of combined flue regulating baffles, wherein a separating flue compartment is arranged at the outlet of each separating flue and is divided into a plurality of sub-compartments, and an integrated regulating baffle is arranged at the outlet of each separating flue compartment in the combined flue and is divided into a plurality of compartment doors, wherein adjacent compartment doors are controlled to connect the sub-compartments of different upstream separating flue compartments.

[0014] According to an embodiment of the cross-arrangement method of the integrated flue regulating baffles of the present invention, each compartment door of the sub-compartment connected to the same upstream flue compartment in the integrated regulating baffle is connected to the same actuator, and each compartment door of the sub-compartment connected to different upstream flue compartments in the integrated regulating baffle is connected to different actuators.

[0015] According to an embodiment of the cross-arrangement method of the combined flue regulating baffles of the present invention, the openings of the compartment doors of the sub-compartments connecting the upstream different separated flue compartments in the integrated regulating baffles are respectively controlled to realize the cross-mixing of the smoke intervals.

[0016] Compared with conventional schemes, the present invention advances the mixing of flue gases in a single separated flue and divides the flue gas volume of the upstream separated flue into multiple portions for intermittent cross-mixing, thereby making the temperature field of the entire mixing surface more uniform and meeting the requirement of uniform flue gas mixing. It not only solves the problem of uneven flue gas temperature field after the upstream flue gases are merged and mixed (not meeting the temperature field requirements of downstream equipment), but also ensures the efficient and safe operation of downstream equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of a cross-arrangement structure of a combined flue regulating baffle according to an exemplary embodiment of the present invention is shown.

[0018] Figure 2A schematic structural diagram showing the connection between the flue partition compartments separating the flues and the integrated regulating baffles in the cross-arrangement structure of the combined flue regulating baffles according to an exemplary embodiment of the present invention is shown.

[0019] Figure 3 A schematic structural diagram of an integrated regulating baffle in a cross-arrangement structure of a combined flue regulating baffle according to an exemplary embodiment of the present invention is shown.

[0020] Description of reference numerals:

[0021] 1-first separated flue, 2-second separated flue, 3-first actuator, 4-second actuator, 5-separated flue compartment, 6-integrated regulating baffle, 7-merged flue, 8-compartment door. DETAILED DESCRIPTION

[0022] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0023] Any feature disclosed in this specification, unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0024] The cross arrangement structure of the combined flue regulating baffles of the present invention is first described below.

[0025] Figure 1 A schematic structural diagram of a cross-arrangement structure of a combined flue regulating baffle according to an exemplary embodiment of the present invention is shown.

[0026] like Figure 1 As shown, according to an exemplary embodiment of the present invention, the combined flue adjustment baffle cross-arrangement structure includes a separating flue compartment 5 and an integrated adjustment baffle 6, wherein the separating flue compartment 5 is arranged at the outlet of each separated flue, and the separating flue compartment 5 of each separated flue is provided with a plurality of sub-compartments along the width direction of the separated flue.

[0027] Among them, the number of separated flues is usually 2 to 4, such as Figure 1 The boiler structure including the first separated flue 1 and the second separated flue 2 is shown in FIG. Moreover, each separated flue is connected with the combined flue 7 through the separated flue compartment 5 and the integrated regulating baffle 6.

[0028] According to the present invention, the partitioning flue compartment 5 of the partitioning flue is provided with 3 to 8 sub-compartments, and the sub-compartments in the partitioning flue compartment 5 of the partitioning flue are not connected to each other. In addition, the sub-compartments of the partitioning flue compartment 5 of each partitioning flue are arranged at intervals, and the sub-compartments of the partitioning flue compartments 5 of adjacent partitioning flues are arranged adjacent to each other. As a result, the smoke in each partitioning flue is divided before being introduced and mixed, and multiple smoke flows are formed through the partitioning flue compartment 5 and can be discharged from each sub-compartment. The process in which the smoke of a single partitioning flue is divided into the sub-compartments of each partitioning flue compartment is a premixing process, that is, the smoke is partially mixed in the process of being divided and flowing through the partitioning flue compartment.

[0029] The integrated regulating baffle 6 of the present invention is arranged at the outlet of the smoke duct compartment 5 and is located in the combined smoke duct 7. The integrated regulating baffle 6 includes a plurality of compartment doors 8, and adjacent compartment doors 8 connect sub-compartments of different upstream smoke duct compartments 5.

[0030] Figure 2 A schematic structural diagram showing the connection between the flue partition compartments separating the flues and the integrated regulating baffles in the cross-arrangement structure of the combined flue regulating baffles according to an exemplary embodiment of the present invention is shown.

[0031] like Figure 2 As shown, each compartment door 8 of the integrated regulating baffle 6 corresponds to a sub-chamber respectively, but adjacent compartment doors 8 should be arranged to connect sub-chambers of different separated flue compartments 5, thereby achieving further cross-mixing of small smoke flows in several sub-chambers after passing through the compartment doors, making the smoke temperature distribution more uniform.

[0032] Furthermore, each compartment door 8 of the sub-compartment connected to the same upstream flue compartment 5 in the integrated adjusting baffle 6 is connected to the same actuator, and each compartment door 8 of the sub-compartment connected to different upstream flue compartments 5 in the integrated adjusting baffle 6 is connected to different actuators.

[0033] Figure 3 A schematic structural diagram of an integrated regulating baffle in a cross-arrangement structure of a combined flue regulating baffle according to an exemplary embodiment of the present invention is shown.

[0034] like Figure 3As shown, taking two partition flues as an example, the partition doors with odd numbers are connected to the partition flue on one side of the upstream, and the partition doors with even numbers are connected to the partition flue on the other side of the upstream. The output shafts of the partition doors with odd numbers are all on the same side and extend out of the combined flue through a connecting rod, and are connected to the transmission rod and the first actuator 3; the output shafts of the partition doors with even numbers are all on the other side and extend out of the combined flue through a connecting rod, and are connected to the transmission rod and the second actuator 4. That is, the actuator is connected to the partition door 8 with an integrated adjustment baffle 6 through a connecting rod and a transmission rod. The present invention integrates multiple adjustment baffles into one baffle (composed of several partition doors) through the integration of the adjustment baffles, which has a simple structure and can also perform appropriate opening control on the smoke of different partition flues.

[0035] The present invention also provides a method for cross-arranging the regulating baffles of the combined flue, specifically, a divided flue compartment 4 is arranged at the outlet of each divided flue and divided into several sub-compartments, and an integrated regulating baffle 6 is arranged at the outlet of each divided flue compartment in the combined flue 7 and divided into several compartment doors 8, wherein the adjacent compartment doors 8 are controlled to connect the sub-compartments of the upstream different divided flue compartments 5. Thus, the flue gas in a single divided flue is mixed in advance and the flue gas volume of the upstream divided flue is divided into multiple parts for intermittent cross-mixing, so that the temperature field of the entire mixing surface is more uniform, and the requirement of uniform flue gas mixing is achieved. Among them, compared with the mixing of 2 or 3 flue gas flows, the cross-mixing of several flue gas flows can achieve the same mixing effect and can save more space and mixing flues.

[0036] Among them, each compartment door 8 of the sub-compartment connected to the same upstream compartment 5 separating the flue in the integrated adjusting baffle 6 is connected to the same actuator, and each compartment door 8 of the sub-compartment connected to different upstream compartments separating the flue in the integrated adjusting baffle 6 is connected to different actuators, and then the opening of each compartment door of the sub-compartment connected to different upstream compartments separating the flue in the integrated adjusting baffle is controlled respectively to realize cross-mixing of smoke intervals.

[0037] The control of each compartment door 8 is not limited to unified control, and the opening of each compartment door can also be controlled separately according to the accuracy, which requires the corresponding setting of more actuators and accessories.

[0038] The present invention will be further described below in conjunction with the embodiments.

[0039] Embodiment 1:

[0040] A power plant has a boiler with a double flue damper at the rear end for temperature control. In actual operation, when the load is 40% to 60%, the flue gas temperature at the outlet of the front dividing flue is 340℃, and the flue gas temperature at the outlet of the rear dividing flue is 290℃.

[0041] However, due to the uneven mixing of the two flue gas flows in the front and rear flues, the flue gas temperature in some downstream areas was lower than 300°C, causing the catalyst of the denitrification device to be poisoned (catalyst failure), seriously affecting the environmental protection index control requirements of the power plant.

[0042] The cross-arrangement structure and method of the regulating baffles of the present invention can effectively solve the problem of uneven mixing of the separated flue ducts and can ensure the safe operation of downstream equipment.

[0043] Embodiment 2:

[0044] A power plant has a boiler with a double flue damper at the rear end for temperature control. In the new design, due to site and space limitations, the distance from the merging position of the tail separated flues to the downstream equipment flue is short. The conventional merged flue structure cannot meet the mixing requirements.

[0045] By adopting the cross-arrangement structure and method of the regulating baffles of the present invention, the length of the combined flue is compressed through cross-mixing of the compartments, thereby meeting the requirements of the site, space and downstream equipment.

[0046] In summary, the present invention arranges an integrated baffle structure that can adjust the flow rate at the merging position of each separated flue, and cross-introduces the flue gases from different separated flues into each small compartment along the width direction and then divides them into strands and crosses them for mixing, so that the flue gas temperature distribution is more uniform, which solves the problem of uneven flue gas temperature field after the upstream flues are merged and mixed (not meeting the temperature field requirements of downstream equipment), and ensures the efficient and safe operation of downstream equipment.

[0047] The present invention is not limited to the above-mentioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A cross-arrangement structure of combined flue regulating baffles, characterized in that: It includes a smoke duct compartment and an integrated regulating baffle, wherein: The smoke duct compartment is arranged at the outlet of each smoke duct, and the smoke duct compartment of each smoke duct is provided with a plurality of sub-chambers along the width direction of the smoke duct; The integrated adjustment baffle is arranged at the outlet of the partitioning smoke compartment and is located in the combined smoke duct, the integrated adjustment baffle includes a plurality of compartment doors and adjacent compartment doors are connected to the sub-compartments of different upstream partitioning smoke compartments; the number of the partitioning smoke ducts is 2 to 4 and each partitioning smoke duct is connected to the combined smoke duct through the partitioning smoke compartment and the integrated adjustment baffle; the partitioning smoke compartment of the partitioning smoke duct is provided with 3 to 8 sub-compartments, and the sub-compartments in the partitioning smoke compartment of the partitioning smoke duct are not connected to each other; the sub-compartments of the partitioning smoke compartment of each partitioning smoke duct are arranged at intervals, and the sub-compartments of the partitioning smoke compartments of adjacent partitioning smoke ducts are arranged adjacent to each other; the compartment doors of the sub-compartments connected to the same upstream partitioning smoke compartment in the integrated adjustment baffle are connected to the same actuator, and the compartment doors of the sub-compartments connected to different upstream partitioning smoke compartments in the integrated adjustment baffle are connected to different actuators.

2. The cross-arrangement structure of the combined flue regulating baffles according to claim 1 is characterized in that: The actuator is connected with the compartment door with integrated regulating baffle through a connecting rod and a transmission rod.

3. A method for cross-arrangement of combined flue regulating baffles, characterized in that: A cross-arrangement structure of a combined flue regulating baffle based on claim 1; a separating flue compartment is set at the outlet of each separated flue and divided into a number of sub-compartments, and an integrated regulating baffle is set at the outlet of each separated flue compartment in the combined flue and divided into a number of compartment doors, wherein adjacent compartment doors are controlled to connect the sub-compartments of different upstream separated flue compartments.

4. The cross arrangement method of combined flue regulating baffles according to claim 3 is characterized in that: Each compartment door of the sub-compartment connected to the same upstream compartment separating the flue in the integrated regulating baffle is connected to the same actuator, and each compartment door of the sub-compartment connected to different upstream compartment separating the flue in the integrated regulating baffle is connected to different actuators.

5. The cross arrangement method of combined flue regulating baffles according to claim 4 is characterized in that: The openings of the doors of the compartments of the sub-compartments connected to the different upstream compartments separating the flue gases in the integrated regulating baffle are controlled respectively to realize the cross-mixing of the flue gases.

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