CN210584493U - SCR denitration flue gas heating device of chain furnace - Google Patents
SCR denitration flue gas heating device of chain furnace Download PDFInfo
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- CN210584493U CN210584493U CN201921258236.XU CN201921258236U CN210584493U CN 210584493 U CN210584493 U CN 210584493U CN 201921258236 U CN201921258236 U CN 201921258236U CN 210584493 U CN210584493 U CN 210584493U
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Abstract
The utility model discloses a chain grate furnace SCR denitration flue gas rising temperature device, this flue gas rising temperature device includes: the partition wall is arranged between the outlet flue of the slag preventing pipe and the boiler tube bundle; the high-temperature flue gas outlet pipe is arranged at the same height position along the radial direction of the boiler tube bundle, and the high-temperature flue gas outlet pipe avoids the arrangement of a plurality of tube bundle pipes, wherein the outlet end of the high-temperature flue gas outlet pipe is connected to an SCR inlet flue, and the inlet end of the high-temperature flue gas outlet pipe is communicated with high-temperature flue gas; the flue gas temperature raising device comprises at least one boiler tube bank, and the boiler tube banks are separated by partition walls. The advantages are that: the device simple structure, convenient to use has higher economic nature, and the high temperature flue gas and the low temperature flue gas of drawing forth can the homogeneous mixing, can satisfy SCR denitration catalyst reaction temperature.
Description
Technical Field
The utility model relates to a flue gas environmental protection reforms transform technical field, more specifically relates to a chain grate furnace SCR denitration flue gas rising temperature device.
Background
Nitrogen oxide (NOx) is one of main atmospheric pollutants, photochemical smog formed by the nitrogen oxide and hydrocarbon seriously harms human health, in addition, the nitrogen oxide is also one of main reasons of acid rain, the frequent occurrence of the acid rain causes great influence on ecological environment and national economy, according to the improvement of national environmental protection requirements, the ultralow emission of smoke becomes the trend of environmental protection, and the denitration of the NOx reaching the ultralow emission Selective Catalytic Reduction (SCR) becomes the mainstream process, namely, the reducing agent is selectively reacted with the NOx in the smoke to generate nontoxic and pollution-free nitrogen (N)2) And water (H)2O) to achieve the aim of denitration. The denitration catalyst in the SCR system flow is an important device, and the commonly used denitration catalyst of the coal-fired boiler requires that the flue gas temperature is 300-420 ℃, and a series of problems that the flue gas SCR denitration cannot react or the catalyst fails, is blocked and the like can be caused outside the temperature range.
Usually, SNCR or high-molecular denitration is generally adopted for denitration of chain-grate furnaces, but with the improvement of environmental requirements, the national requirements that the chain-grate furnaces also meet the requirement of ultralow emission are slowly required, SCR denitration is added at the tail of a boiler, but the load of a plurality of chain-grate furnaces is greatly changed, the tail temperature cannot meet the requirement of SCR denitration flue gas temperature, the boiler needs to be modified, generally, the modification of the boiler is to modify a heating surface, the position of the heating surface is changed to modify the front heating surface into SCR denitration, the boiler efficiency is not influenced, the SCR denitration flue gas temperature requirement can be met, but the load fluctuation of the heating chain-grate furnace is large, the low load requirement can be met when the position of the heating surface is modified, the high load causes the high flue gas temperature of an SCR part, and the catalyst is damaged, in addition, some chain-grate furnaces contain pipe bundles, the method cannot move the pipe bundles, leading to a series of problems that the SCR of the chain grate furnace can not be implemented, the denitration can not reach the standard, and the like.
Therefore, it is necessary to develop a chain furnace SCR denitration flue gas heating device which has a simple structure, is convenient to use, has high economical efficiency, and can uniformly mix the led high-temperature flue gas and the low-temperature flue gas.
The information disclosed in this background section of the invention is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.
SUMMERY OF THE UTILITY MODEL
Problem to prior art existence, the utility model provides a chain furnace SCR denitration flue gas rising temperature device, it can be through setting up high temperature flue gas fairlead to reach the emission standard who satisfies flue gas denitration.
In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a chain stove SCR denitration flue gas heating device, includes the chain stove that sets gradually, prevents sediment pipe and boiler tube bank, and evenly set up in a plurality of root canal bundle pipes in the boiler tube bank, flue gas heating device still includes:
the partition wall is arranged between the outlet flue of the slag preventing pipe and the boiler tube bundle;
the high-temperature flue gas outlet pipe is arranged at the same height position along the radial direction of the boiler tube bundle, the high-temperature flue gas outlet pipe avoids the arrangement of the tube bundle pipes, the outlet end of the high-temperature flue gas outlet pipe is connected to an SCR inlet flue, and the inlet end of the high-temperature flue gas outlet pipe is communicated with high-temperature flue gas;
the flue gas temperature raising device comprises at least one boiler tube bank, and the boiler tube banks are separated by the partition wall.
Preferably, the flue gas temperature increasing device further comprises:
the adjusting door comprises an inner-layer door plate and an outer-layer door plate which is connected with the inner-layer door plate in a sliding mode, and the adjusting door is arranged between the outlet end of the high-temperature flue gas outlet pipe and the SCR inlet flue;
the inner-layer door plate is arranged at the outlet end of the high-temperature flue gas outlet pipe, and the outer-layer door plate is close to the SCR inlet flue.
Preferably, the inner door panel is provided with holes, the positions and the sizes of the holes are matched with those of the high-temperature flue gas outlet pipes, and the number of the holes is the same as that of the high-temperature flue gas outlet pipes.
Preferably, the flue gas temperature increasing device further comprises:
and the power unit is connected with the outer door panel and used for controlling the movement of the outer door panel so as to control the opening and closing of the opening.
Preferably, the power unit is an electric actuator or a pneumatic actuator.
Preferably, the size of the adjusting door is selected according to the length of the tube bundle and the size of a nozzle of the high-temperature flue gas outlet pipe.
Preferably, the size of the pipe orifice of the high-temperature flue gas outlet pipe is smaller than the distance between two adjacent pipe bundle pipes.
Preferably, one end of the high-temperature flue gas outlet pipe communicated with the high-temperature flue gas is arranged inside the front end of the boiler tube bundle or behind the slag preventing pipe at the hearth outlet.
The utility model has the advantages that:
high temperature flue gas is drawn forth through the pressure differential at high temperature flue gas outlet pipe both ends to adjust the high temperature flue gas volume of drawing forth through the governing door, can satisfy SCR denitration catalyst reaction temperature, and then satisfy flue gas denitration's emission standard, in addition, the device simple structure, convenient to use has higher economic nature, and the high temperature flue gas and the low temperature flue gas of drawing forth can the homogeneous mixing.
The flue gas warming device of the present invention has other features and advantages which will be apparent from or are set forth in detail in the accompanying drawings and the following detailed description which are incorporated herein, and which together serve to explain certain principles of the invention.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments of the present invention with reference to the attached drawings, in which like reference numerals generally represent like parts in exemplary embodiments of the present invention.
Fig. 1 shows a schematic diagram of a chain grate furnace SCR denitration flue gas heating device according to an exemplary embodiment of the present invention.
Fig. 2 shows a schematic view of the direction a-a of fig. 1 of the present invention.
Fig. 3 shows a schematic view of an adjustment door of an exemplary embodiment of the present invention.
Description of reference numerals:
1. a chain furnace; 2. a slag-proof pipe; 3. a partition wall; 4. a tube bundle tube; 5. an SCR inlet flue; 6. a high-temperature flue gas outlet pipe; 7. a boiler bank; 8. an adjustment gate; 9. a power unit; 10. and (6) opening holes.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention have been illustrated in the accompanying drawings, it is to be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The utility model provides a chain stove SCR denitration flue gas heating device, including the chain stove that sets gradually, prevent sediment pipe and boiler tube bank to and evenly set up the many root canal bundle pipes in boiler tube bank, flue gas heating device still includes:
the partition wall is arranged between the outlet flue of the slag preventing pipe and the boiler tube bundle;
the high-temperature flue gas outlet pipe is arranged at the same height position along the radial direction of the boiler tube bundle, and the high-temperature flue gas outlet pipe avoids the arrangement of a plurality of tube bundle pipes, wherein the outlet end of the high-temperature flue gas outlet pipe is connected to an SCR inlet flue, and the inlet end of the high-temperature flue gas outlet pipe is communicated with high-temperature flue gas;
the flue gas temperature raising device comprises at least one boiler tube bank, and the boiler tube banks are separated by partition walls.
Because the partition walls are arranged among the boiler tube bundles and between the boiler tube bundles and the outlet flues of the slag preventing pipes, the flue gas can only flow through the fixed flue gas circulation channel, and the high-temperature flue gas is conveniently led out by the high-temperature flue gas outlet pipe.
The outlet of the high-temperature flue gas outlet pipe is connected to the SCR inlet flue, the inlet end of the high-temperature flue gas outlet pipe is communicated with the high-temperature flue gas, the high-temperature flue gas is automatically led out through the pressure difference at the two ends of the high-temperature flue gas outlet pipe, extra equipment is not needed, the heating surface of a boiler is not needed to be changed, the arrangement of the high-temperature flue gas outlet pipe cancels the heat exchange between the high-temperature flue gas and the pipe bundle pipe, the high-temperature flue gas is directly mixed with the low-temperature flue gas of the SCR.
Wherein, the high temperature flue gas eduction tube evenly sets up in boiler tube bank, can be with the more even of high temperature flue gas and low temperature flue gas mixture.
Furthermore, the high-temperature flue gas outlet pipe does not need to be limited by the shape of the pipe opening, and can be round, triangular, square and the like, and any shape of pipe can be manufactured.
Preferably, the flue gas temperature raising device further comprises:
the adjusting door comprises an inner-layer door plate and an outer-layer door plate which is in sliding connection with the inner-layer door plate, and the adjusting door is arranged between the outlet end of the high-temperature flue gas outlet pipe and the SCR inlet flue.
Further, be equipped with the trompil on the inlayer door plant, the position and the size of trompil and the position and the size phase-match of high temperature flue gas eduction tube, the quantity of trompil is the same with the quantity of high temperature flue gas eduction tube.
Wherein, flue gas heating device still includes:
and the power unit is connected with the outer door panel and used for controlling the movement of the outer door panel so as to control the opening and closing of the opening.
The trompil is for making the flue gas flow from the high temperature flue gas outlet pipe, can reduce the flow area regulation of trompil through the removal of outer door plant when need not drawing a large amount of flue gases and draw out the high temperature flue gas volume, specifically, power unit is through electronic or pneumatic executive component removal outer door plant, makes the position of outer door plant slowly plug up the trompil, reduces or increases the flow area of trompil according to actual need.
Set up governing valve and power pack at the exit end of high temperature flue gas outlet pipe, the high temperature flue gas volume that can draw forth according to the temperature automatically regulated of needs, when boiler load is high, SCR entry flue need not heat up, can close the trompil on the inlayer door plant completely through power pack, when boiler load is low, SCR entry flue needs heat up, can control the degree of opening of trompil on the inlayer door plant through power pack, the required high temperature flue gas volume that automatically regulated draws forth.
Wherein, the power unit is an electric executive component or a pneumatic executive component.
The electric actuating element is flexible to install, convenient to use and most widely applied to an automatic control system; the pneumatic executive component has the characteristics of simple structure, light weight, reliable work and explosion prevention, and is more applied to automatic lines of medium and low power chemical petroleum equipment and mechanical industrial production.
Further, the size of the adjusting door is selected according to the length of the tube bundle and the size of the pipe orifice of the high-temperature flue gas outlet pipe.
Further, the size of the pipe orifice of the high-temperature flue gas outlet pipe is smaller than the distance between the multiple bundle pipes.
The selection of dimensions is not described in detail here, and a person skilled in the art will naturally select dimensions of other elements that match the dimensions of the original elements in view of the description of the present application.
As the preferred scheme, the inlet end of the high-temperature flue gas outlet pipe is arranged inside the front end of the boiler tube bundle or behind the slag preventing pipe at the outlet of the hearth.
The inner part of the front end of the boiler tube bundle and the rear position of the slag preventing pipe at the hearth outlet are the gathering positions of high-temperature flue gas, so that the high-temperature flue gas is conveniently discharged.
The utility model discloses a flue gas rising temperature device simple structure, convenient to use has higher economic nature, and the high temperature flue gas and the low temperature flue gas of drawing forth can the homogeneous mixing.
Example 1
Fig. 1 shows a schematic diagram of a chain grate furnace SCR denitration flue gas heating device according to an exemplary embodiment of the present invention. Fig. 2 shows a schematic view of the direction a-a of fig. 1 of the present invention.
As shown in fig. 1 and fig. 2, this embodiment provides a chain furnace SCR denitration flue gas heating device, including chain furnace 1, slag-proof pipe 2 and boiler tube bank 7 that set gradually to and evenly set up many tube bank pipes 4 in boiler tube bank 7, flue gas heating device still includes:
the partition wall 3 is arranged between the outlet flue of the slag preventing pipe 2 and the boiler tube bundle 7;
the high-temperature flue gas outlet pipe 6 is arranged at the same height position along the radial direction of the boiler tube bundle 7, the high-temperature flue gas outlet pipe 6 is arranged to avoid the plurality of tube bundle pipes 4, the outlet end of the high-temperature flue gas outlet pipe 6 is connected to the SCR inlet flue 5, and the inlet end of the high-temperature flue gas outlet pipe 6 is communicated with high-temperature flue gas;
wherein, flue gas heating device includes at least one boiler bank 7, and a plurality of boiler banks 7 are separated through partition wall 3.
As shown in fig. 2, the high temperature flue gas outlet pipe in this embodiment adopts 6 round pipes, and according to the size of the boiler, eight high temperature flue gas outlet pipes 6 are uniformly arranged in each boiler tube bank 7, and the eight high temperature flue gas outlet pipes 6 penetrate through the boiler tube bank 7, so that the high temperature flue gas and the low temperature flue gas can be mixed more uniformly.
Fig. 3 shows a schematic view of an adjustment door of an exemplary embodiment of the present invention.
As shown in fig. 3, the flue gas temperature increasing device further includes:
and the adjusting door 8 comprises an inner-layer door plate (not shown) and an outer-layer door plate (not shown) which is in sliding connection with the inner-layer door plate, and the adjusting door 8 is arranged between the outlet end of the high-temperature flue gas outlet pipe 6 and the SCR inlet flue 5.
Further, the inner-layer door panel is provided with the opening holes 10, the positions and the sizes of the opening holes 10 are matched with those of the high-temperature flue gas outlet pipe 6, the number of the opening holes 10 is the same as that of the high-temperature flue gas outlet pipe 6, the opening holes are eight, only 5 opening holes are shown in fig. 3 due to size limitation, and fig. 3 is only a schematic diagram of the adjusting door 8.
Wherein, flue gas heating device still includes:
and the power unit 9 is connected with the outer door panel and used for controlling the movement of the outer door panel so as to control the opening and closing of the opening.
In this embodiment, the power unit 9 employs an electric actuator to control the adjustment gate.
The electric actuating element is flexible to install, convenient to use and most widely applied to an automatic control system.
Among them, a dc servomotor, an ac servomotor, a stepping motor, an electromagnetic brake, a relay, and the like are commonly used. The electric actuating element has the performances of wide speed regulation range, high sensitivity, high response speed, no autorotation phenomenon and the like, can continuously and reliably work for a long time, and can meet the special requirements of explosion prevention, corrosion prevention, high temperature resistance and the like under special environmental conditions.
In this embodiment, a dc servomotor is used.
In this embodiment, the inlet end of the high-temperature flue gas outlet pipe 6 is arranged behind the slag preventing pipe 2 at the outlet of the hearth.
The foregoing description of the embodiments of the invention has been presented for purposes of illustration and not limitation, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the illustrated embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (8)
1. The utility model provides a chain stove SCR denitration flue gas heating device, includes the chain stove that sets gradually, prevents sediment pipe and boiler tube bank, and evenly set up in a plurality of root canal bundle pipes in the boiler tube bank, its characterized in that, flue gas heating device still includes:
the partition wall is arranged between the outlet flue of the slag preventing pipe and the boiler tube bundle;
the high-temperature flue gas outlet pipe is arranged at the same height position along the radial direction of the boiler tube bundle, the high-temperature flue gas outlet pipe avoids the arrangement of the tube bundle pipes, the outlet end of the high-temperature flue gas outlet pipe is connected to an SCR inlet flue, and the inlet end of the high-temperature flue gas outlet pipe is communicated with high-temperature flue gas;
the flue gas temperature raising device comprises at least one boiler tube bank, and the boiler tube banks are separated by the partition wall.
2. The SCR denitration flue gas heating device of the chain grate furnace of claim 1, further comprising:
the adjusting door comprises an inner-layer door plate and an outer-layer door plate which is connected with the inner-layer door plate in a sliding mode, and the adjusting door is arranged between the outlet end of the high-temperature flue gas outlet pipe and the SCR inlet flue;
the inner-layer door plate is arranged at the outlet end of the high-temperature flue gas outlet pipe, and the outer-layer door plate is close to the SCR inlet flue.
3. The SCR denitration flue gas heating device of the chain grate furnace of claim 2, wherein the inner door panel is provided with openings, the positions and the sizes of the openings are matched with those of the high-temperature flue gas outlet pipes, and the number of the openings is the same as that of the high-temperature flue gas outlet pipes.
4. The SCR denitration flue gas heating device of claim 3, further comprising:
and the power unit is connected with the outer door panel and used for controlling the movement of the outer door panel so as to control the opening and closing of the opening.
5. The SCR denitration flue gas heating device of the conveyor-chain furnace of claim 4, wherein the power unit is an electric actuator or a pneumatic actuator.
6. The SCR denitration flue gas heating device of claim 2, wherein the size of the adjusting door is selected according to the length of the tube bundle and the size of the orifice of the high-temperature flue gas outlet pipe.
7. The SCR denitration flue gas heating device of the stoker furnace of claim 1, wherein the size of the orifice of the high-temperature flue gas outlet pipe is smaller than the distance between two adjacent pipe bundle pipes.
8. The SCR denitration flue gas heating device of the chain grate furnace of claim 1, wherein an inlet end of the high-temperature flue gas outlet pipe is arranged inside the front end of the boiler tube bundle or behind the slag prevention pipe at a hearth outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921258236.XU CN210584493U (en) | 2019-08-06 | 2019-08-06 | SCR denitration flue gas heating device of chain furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921258236.XU CN210584493U (en) | 2019-08-06 | 2019-08-06 | SCR denitration flue gas heating device of chain furnace |
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| Publication Number | Publication Date |
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| CN210584493U true CN210584493U (en) | 2020-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921258236.XU Active CN210584493U (en) | 2019-08-06 | 2019-08-06 | SCR denitration flue gas heating device of chain furnace |
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| CN (1) | CN210584493U (en) |
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- 2019-08-06 CN CN201921258236.XU patent/CN210584493U/en active Active
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