CN217441615U - Novel high-temperature flue gas bypass system - Google Patents

Abstract

The utility model provides a novel high-temperature flue gas bypass system, which comprises a bypass flue communicated with a main flue; the main flue comprises a boiler horizontal flue, a vertical shaft flue, an economizer outlet flue, a denitration system inlet flue and an SCR reaction zone which are sequentially communicated; wherein the bypass stack comprises a first segment and a second segment; a smoke window is arranged at the output end of the horizontal flue of the boiler, the input end of the first section is connected with the smoke window, and the output end of the first section is connected with the input end of the second section; the output end of the second segment is communicated with the input end of the economizer outlet flue. The embodiment opens the smoke window on the horizontal flue of the boiler, so that the smoke temperature of the bypass smoke is higher, the operation requirement of the denitration system can be met under lower load even if the amount of the bypass smoke is smaller, and the problem of ash deposition of the low-load horizontal flue is solved.

Description

Novel high-temperature flue gas bypass system

Technical Field

The utility model relates to a boiler environmental protection technology field, in particular to novel high temperature flue gas bypass system.

Background

The peak regulation of the thermal power generating unit is a new normal state at present, and the deep peak regulation capability of the thermal power generating unit is limited by the condition that the temperature of denitration inlet flue gas is lower than 310 ℃ under low load at present, so that the requirement of the lowest operation temperature of a catalyst cannot be met. Under this prerequisite, solve this problem through increasing high temperature flue gas bypass usually, nevertheless for guaranteeing boiler efficiency, during high load under the general condition, thereby can close the turn-off door on the high temperature flue gas bypass and withdraw from the operation of high temperature flue gas bypass, although closed the high temperature flue gas bypass this moment, the import horizontal segment of high temperature flue gas bypass still links to each other with the back shaft, forms the dead zone that the flue gas flows.

The ash accumulation at the inlet horizontal section of the high-temperature flue gas bypass is serious due to the fact that the high-temperature flue gas bypass exits from operation for a long time, so that the circulation of the high-temperature flue gas bypass is influenced, and even the ash accumulation at a turn-off door on the high-temperature flue gas bypass is blocked and cannot be opened. Because the heat supply unit does not have the condition of deep peak regulation in the whole heat supply season, the dust deposition of the horizontal section of the high-temperature flue gas bypass is serious after the heat supply is finished, and the bypass flue cannot be put into operation.

In the prior art, for example, CN213746815U, CN214370135U and the like all propose to solve the problem of ash deposition in the horizontal section of the high-temperature flue gas bypass, but they all have major drawbacks, wherein CN213746815U realizes prevention of ash deposition in the horizontal section of the high-temperature flue gas bypass by adding a blowing wind, wherein the knowable compressed air blowing capability is limited, the ash deposition problem cannot be thoroughly cleaned, and limited by the field conditions, some power plants cannot be arranged in the slope section; in CN214370135U, an arc ash conveying pipe is arranged between the high-temperature flue gas bypass horizontal section and the rear vertical shaft to solve the chance problem of the high-temperature flue gas bypass horizontal section, wherein the arc ash conveying pipe must be arranged to reform the heating surface of the rear vertical shaft, and only gravity ash conveying is performed, so that the ash conveying effect is limited.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem in the correlation technique to a certain extent at least, provide a novel high temperature flue gas bypass system, set up the cigarette window on boiler horizontal flue for the smoke temperature of bypass flue gas is higher, even the bypass flue gas volume is less also can realize satisfying the operating requirement of deNOx systems under lower load, and has solved the problem of low-load horizontal flue deposition simultaneously.

In view of this, according to an embodiment of the present invention, a novel high temperature flue gas bypass system is provided, which includes a bypass flue communicated with a main flue; the main flue comprises a boiler horizontal flue, a vertical shaft flue, an economizer outlet flue, a denitration system inlet flue and an SCR reaction zone which are sequentially communicated;

wherein the bypass stack comprises a first segment and a second segment; wherein, the output end of the horizontal flue of the boiler is provided with a smoke window, the input end of the first section is connected with the smoke window, and the output end of the first section is connected with the input end of the second section; the output end of the second segment is communicated with the input end of the economizer outlet flue.

In some embodiments, the louver comprises a plurality of support tubes and sealing fins; wherein the plurality of support tubes are arranged side by side in the length direction of the smoke window; reinforcing pipes are arranged on one side of the smoke window in the length direction, and the two reinforcing pipes are respectively positioned at two ends of the supporting pipe in the length direction; sealing fins are arranged between the reinforcing pipe and the supporting pipe adjacent to the reinforcing pipe; the sealing fins, the reinforcing tube and the supporting tube provided with the reinforcing tube enclose a through-flow area.

In some embodiments, the first segment is disposed perpendicular to the boiler horizontal flue; the second segment and the horizontal flue of the boiler form an included angle of not less than 50 degrees.

In some embodiments, a first expansion joint, a shutoff valve and a regulating valve are arranged on the first section in sequence along the flow direction of the flue gas; wherein the adjustment gate is located at a junction of the first section and the second section.

In some embodiments, a viewing aperture is formed in the first segment, wherein the viewing aperture is positioned between the first expansion joint and the shutoff gate, wherein the shutoff gate and the viewing aperture are spaced no more than 400mm apart.

In some embodiments, a second expansion joint is provided at the output end of the second segment.

In some embodiments, a main flue adjusting door is arranged at the input end of the coal economizer outlet flue; the output end of the second segment is located below the main flue adjustment door.

In some embodiments, a ceramic sleeve is sleeved in the bypass flue between the shutoff door and the smoke window.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of a high-temperature flue gas bypass system according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a high-temperature flue gas bypass system according to another embodiment of the present invention.

Fig. 3 is a top view of a smoke window provided by an embodiment of the present invention.

Fig. 4 is a schematic structural view of a reinforced pipe according to an embodiment of the present invention.

The system comprises a vertical shaft flue, a 2-economizer outlet flue, a 3-denitration system inlet flue, a 4-SCR reaction zone, a 5-boiler horizontal flue, a 6-observation hole, a 7-first expansion joint, an 8-shutoff door, a 9-regulating door, a 10-second expansion joint, a 11-first section, a 12-second section, a 13-low-temperature superheater, a 14-economizer, a 15-main flue regulating door, a 16-smoke window, a 17-supporting pipe, an 18-sealing fin, a 19-reinforcing pipe and a 20-through flow area.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

In view of the above, the utility model provides a novel high-temperature flue gas bypass system, which comprises a bypass flue communicated with a main flue; the main flue comprises a boiler horizontal flue 5, a vertical shaft flue 1, an economizer outlet flue 2, a denitration system inlet flue 3 and an SCR reaction zone 4 which are sequentially communicated;

wherein the bypass stack comprises a first segment 11 and a second segment 12; wherein, the output end of the horizontal flue 5 of the boiler is provided with a smoke window 16, the input end of the first segment 11 is connected with the smoke window 16, and the output end thereof is connected with the input end of the second segment 12; the output end of the second segment 12 communicates with the input end of the economizer outlet stack 2.

Specifically, as shown in fig. 1, the main flue comprises a boiler horizontal flue 5, a vertical shaft flue 1, a coal economizer outlet flue 2, a denitration system inlet flue 3 and an SCR reaction zone 4 which are sequentially communicated, wherein boiler flue gas sequentially passes through the boiler horizontal flue 5 and then enters the vertical shaft flue 1 and the vertical shaft flue 1, and a low-temperature superheater 13 and an economizer 14 are sequentially arranged in the vertical shaft flue 1 according to the flow direction of the flue gas; the flue gas sequentially passes through a low-temperature superheater 13 and an economizer 14 in the vertical shaft flue 1, then enters a horizontally arranged economizer outlet flue 2, passes through a vertically arranged denitration system inlet flue 3, and then enters the SCR reaction zone 4. Wherein an SCR denitration reactor is arranged in the SCR reaction zone 4 for catalytic denitration.

In the embodiment, the smoke window 16 is arranged at the output end of the horizontal flue 5 of the boiler, wherein the input end of the bypass flue is connected with the smoke window 16, and the output end of the bypass flue is connected with the input end of the outlet flue 2 of the economizer so that part of high-temperature smoke passes through the bypass flue. Specifically, the input end of the first segment 11 is connected with the smoke window 16, and the output end of the first segment is connected with the input end of the second segment 12; the output end of the second segment 12 communicates with the input end of the economizer outlet stack 2. The smoke window 16 is arranged on the horizontal flue 5 of the boiler in the embodiment, so that the smoke temperature of the bypass smoke is higher, the operation requirement of the denitration system can be met under lower load even if the amount of the bypass smoke is smaller, and the problem of ash deposition of the low-load horizontal flue is solved.

In some embodiments, the louver 16 includes a number of support tubes 17 and sealing fins 18; wherein a plurality of support tubes 17 are arranged side by side in the length direction of the smoke window 16; a reinforcing pipe 19 is arranged on one side of the smoke window 16 in the length direction, and the two reinforcing pipes 19 are respectively positioned at two ends of the supporting pipe 17 in the length direction; sealing fins 18 are arranged between the reinforcing tube 19 and the supporting tube 17 adjacent to the reinforcing tube; the sealing fins 18, the reinforcing tube 19 and the support tube 17 on which the reinforcing tube 19 is arranged enclose a flow area 20.

For convenience of understanding, the following description will be made, taking as an example that the longitudinal direction of the louver 16 coincides with the left-right direction and the longitudinal direction of the support pipe 17 coincides with the up-down direction, as shown in fig. 3.

The supporting tubes 17 are sequentially arranged side by side from left to right, wherein the upper end and the lower end of the supporting tube 17 are respectively and symmetrically provided with reinforcing tubes 19, and the reinforcing tubes 19 are positioned on the left side or the right side of the supporting tube 17; as shown in fig. 3 to 4, the reinforcing pipes 19 are located on the left side of the support pipe 17, and each reinforcing pipe 19 has a zigzag structure with one end arranged parallel to the support pipe 17 and the other end extending toward the support pipe 17 and forming an angle with the support pipe 17. Sealing fins 18 are arranged between the reinforcing tube 19 and the supporting tube 17 adjacent to the reinforcing tube on the left side, wherein the sealing fins 18 are arranged in parallel with the supporting tube 17, so that the supporting tube 17, the reinforcing tube 19 arranged at the upper end and the lower end of the supporting tube 17 and the sealing fins 18 arranged on the left side of the reinforcing tube 19 enclose a through-flow area 20 for passing high-temperature flue gas.

In some embodiments, a sealing fin 18 is disposed between the support tube 17 and a reinforcing tube 19 disposed on the support tube 17 for controlling the flow of the high temperature flue gas.

In some embodiments, expansion joints are arranged on the bypass flue, wherein a first expansion joint 7 and a second expansion joint 10 are arranged in sequence along the flow direction of the flue gas, and a shutoff door 8 and a regulating door 9 are respectively arranged between the first expansion joint 7 and the second expansion joint 10 in sequence.

Specifically, as shown in fig. 1, the first expansion joint 7 and the second expansion joint 10 are arranged to effectively reduce the deformation risk of the bypass flue, and in order to prevent the shut-off door 8 of the bypass flue from being damaged due to high deformation under high load, the shut-off door 8 of the bypass flue is made of a high-temperature ceramic door, and the shut-off door 8 of the bypass flue is in a closed state under high load.

Illustratively, the first section 11 is arranged perpendicular to the horizontal flue 5 of the boiler, the second section 12 forms an included angle of not less than 50 degrees with the horizontal flue 5 of the boiler, and the first expansion joint 7, the shutoff door 8 and the regulating door 9 are sequentially arranged on the first section 11 along the flow direction of flue gas; wherein the regulating gate 9 is located at the junction of the first segment 11 and the second segment 12 and the second expansion joint 10 is provided at the output of the second segment 12.

In the embodiment, when the ash falling in the first section 11 is large, the shutoff door 8 can be opened, and the falling ash can be output through the second section 12; and the second segment 12 and the horizontal boiler flue 5 form an included angle of not less than 50 degrees, and good ash falling performance is realized through the pressure difference and the gravity action of the outlet flue 2 of the economizer and the horizontal boiler flue 5.

In some embodiments, to prevent damage to the bypass flue under high loads, a ceramic sleeve is sleeved inside the bypass flue between the bypass flue shutoff door 8 and the louver 16. Wherein, the ceramic sleeve can be poured by high-temperature resistant ceramic casting materials.

In some embodiments, a viewing aperture 6 is provided in the first section 11, wherein the viewing aperture 6 is located between the first expansion joint 7 and the shutoff gate 8, wherein the shutoff gate 8 and the viewing aperture 6 are spaced apart by no more than 400 mm.

As figure 2 specifically, set up observation hole 6 on first festival section 11, the canopy ash condition in the first festival section 11 can be monitored to the artifical observation of accessible, or automatic viewing device such as infrared range finding, prevents that bypass flue shutoff door 8's deposition is jammed under the high load, and in actual production, the interval of shutoff door 8 and observation hole 6 is not more than 400 mm.

In some embodiments, a main stack adjustment gate 15 is provided at the input end of the economizer outlet stack 2; the output end of the second segment 12 is located below the main stack adjustment gate 15.

Specifically, as shown in fig. 2, a main flue adjusting door 15 is arranged at an input end of the exit flue 2 of the economizer, the main flue adjusting door 15 is located below the economizer 14 and above an output end of the second segment 12, and the main flue adjusting door 15 is arranged to improve the resistance of the main flue and increase the flue gas volume of the bypass flue.

The device for preventing the dust accumulation of the horizontal section of the high-temperature flue gas bypass provided by the embodiment has good application effect no matter the device usually participates in the unit of deep peak regulation or only operates in the process of starting and stopping the boiler, has the advantages of safety in unit operation, low investment modification cost, low maintenance cost, convenience and easiness in implementation, is easy to modify the existing boiler, is not limited by areas and coal types, and is suitable for various coal-fired units.

In the description of the present invention, it is to be understood that the terms "central", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom"

The terms "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in a generic and descriptive sense only and not for purposes of limitation, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not necessarily to be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (8)

1. A novel high-temperature flue gas bypass system is characterized by comprising a bypass flue communicated with a main flue; the main flue comprises a horizontal boiler flue, a vertical shaft flue, an economizer outlet flue, a denitration system inlet flue and an SCR reaction area which are sequentially communicated;

wherein the bypass stack comprises a first segment and a second segment; wherein, the output end of the horizontal flue of the boiler is provided with a smoke window, the input end of the first section is connected with the smoke window, and the output end of the first section is connected with the input end of the second section; the output end of the second segment is communicated with the input end of the economizer outlet flue.

2. The system of claim 1, wherein the louver comprises a plurality of support tubes and sealing fins; wherein the plurality of support tubes are arranged side by side in the length direction of the smoke window; reinforcing pipes are arranged on one side of the smoke window in the length direction, and the two reinforcing pipes are respectively positioned at two ends of the supporting pipe in the length direction; sealing fins are arranged between the reinforcing pipe and the supporting pipe adjacent to the reinforcing pipe; the sealing fins, the reinforcing tube and the supporting tube provided with the reinforcing tube enclose a through-flow area.

3. The system of claim 1, wherein the first segment is disposed perpendicular to the boiler horizontal flue; the second segment and the horizontal flue of the boiler form an included angle of not less than 50 degrees.

4. The system of claim 1, wherein a first expansion joint, a shutoff gate and a regulation gate are arranged in sequence on the first segment in the flow direction of the flue gas; wherein the adjustment gate is located at a junction of the first section and the second section.

5. The system of claim 4, wherein a viewing port is formed in the first segment, wherein the viewing port is positioned between the first expansion joint and the shutoff gate, and wherein the viewing port and the shutoff gate are spaced apart by no more than 400 mm.

6. The system of claim 1, wherein a second expansion joint is provided at an output end of the second segment.

7. The system of claim 1, wherein a main stack damper is provided at an input end of the economizer outlet stack; the output end of the second segment is located below the main flue adjustment door.

8. The system of claim 4, wherein a ceramic sleeve is sleeved in the bypass flue between the shutoff door and the smoke window.

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