CN211837272U - A cut apart storehouse formula guide plate structure for exhaust-heat boiler flaring flue - Google Patents
A cut apart storehouse formula guide plate structure for exhaust-heat boiler flaring flue Download PDFInfo
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- CN211837272U CN211837272U CN202020327384.9U CN202020327384U CN211837272U CN 211837272 U CN211837272 U CN 211837272U CN 202020327384 U CN202020327384 U CN 202020327384U CN 211837272 U CN211837272 U CN 211837272U
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Abstract
The utility model discloses a cut apart storehouse formula guide plate structure for exhaust-heat boiler flaring flue, including a plurality of root pipes, a plurality of first connecting piece and a plurality of second connecting piece, wherein, a root pipe corresponds a first connecting piece and a second connecting piece, the one end of pipe is connected on the inner wall of flue one side through corresponding first connecting piece, the other end of pipe is connected on the inner wall of flue opposite side through corresponding the second connecting piece, be fixed with a plurality of gussets between two adjacent pipes, this structure can adapt to gas turbine export flue gas high temperature, the high velocity of flow, high pressure and rotatory characteristics and flaring flue interior heat retaining structure, guarantee the stable high-efficient economic reliable operation of SCR deNOx systems.
Description
Technical Field
The utility model discloses gas steam combined cycle unit SCR denitration technical field relates to a cut apart storehouse formula guide plate structure for exhaust-heat boiler flaring flue.
Background
The gas-steam combined cycle power generation technology is widely applied in China due to the characteristics of cleanness and high efficiency. The concentration of NOx discharged from the outlet of the gas turbine can be controlled to 50mg/m3(Standard, dry basis, 15% O)2The same applies below). In recent years, with the improvement of national environmental standards, many regions have made stricter requirements on NOx emission of combustion engines, for example, the local standard DB11/847 published in 2011 of Beijing, requires NOx emission less than 30mg/m3(ii) a Shenzhen Shenfu issued by people's government [2017]No. 1 document 'Shenzhen city atmospheric environment quality promotion plan (2017 and 2020)' requires that NOx emission concentration of newly-built gas generating set is controlled to be 15mg/m3The NOx emission concentration of the grade E gas generator set is controlled to be 25mg/m before 20203The NOx emission concentration of the F-grade gas generator set is controlled to be 15mg/m3The following. In such cases, it is difficult to meet NOx emission requirements by means of gas turbine-only low-nitrogen combustion technology. A catalyst is placed in the waste heat boiler, and a feasible scheme is formed by adopting an SCR denitration technology.
In the SCR denitration technology, flue gas flow field indexes are important influence factors of the performance of a denitration system. For the gas-steam combined cycle SCR denitration technology, the section of an exhaust flue of a gas turbine is relatively small, and the section of a rear waste heat boiler is relatively large in size. For example, in a 9F class combustion engine, the diameter of the exhaust flue of the gas turbine is 6.3m, the cross section width of the rear waste heat boiler is 10m, and the height of the rear waste heat boiler is 20m, and a flaring flue is usually arranged between the outlet flue of the gas turbine and the waste heat boiler, so that the length of the flaring flue cannot be too long due to the limitation of site space. Therefore, the uniformity of the flue gas velocity distribution on the cross section of the waste heat boiler is poor. The catalyst used for SCR denitration has higher requirements on speed uniformity and ammonia nitrogen molar ratio uniformity on the inlet section, an unqualified flue gas flow field can cause the increase of ammonia escape of a denitration system, and the operation cost is increased; the denitration efficiency of some units can reach more than 90 percent, and even the denitration efficiency can not reach the standard stably. Therefore, the diversion device is additionally arranged on the flaring flue, and the better solution is achieved for improving the uniformity of the distribution of the flue gas flow field on the section of the waste heat boiler. However, the addition of a flow guide device on the flaring flue of the waste heat boiler faces the following difficulties: (1) the flow rate, temperature and positive pressure of the flue gas exhausted by the combustion engine are high; (2) the waste heat boiler and the flaring flue are internally insulated, and the flaring flue has larger size for a large-scale gas turbine. The pressure difference between the windward side and the leeward side of the guide plate is larger and the pressure born by the guide plate is larger by using the conventional guide plate;
on the other hand, the heat insulation structure in the flue provides higher requirements for the support structure of the guide plate, the strength requirement of the support structure is considered, factors such as thermal expansion and the like need to be considered, in addition, the flue gas at the outlet of the combustion engine has certain rotational flow strength, and the influence of vibration needs to be considered in the design of the guide plate.
Therefore, in order to enable the SCR denitration system of the gas-steam combined cycle unit to operate stably, efficiently, economically and reliably, a guide plate structure suitable for an inlet flaring flue of a waste heat boiler needs to be designed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a cut apart storehouse formula guide plate structure for exhaust-heat boiler flaring flue, this structure can adapt to gas turbine export flue gas high temperature, the high velocity of flow, high pressure and rotatory characteristics and flaring flue interior heat retaining structure, guarantees that SCR deNOx systems is stable high-efficient economic reliable operation.
In order to achieve the above object, the split bin type deflector structure for the flaring flue of the waste heat boiler comprises a plurality of round pipes, a plurality of first connecting pieces and a plurality of second connecting pieces, wherein one round pipe corresponds to one first connecting piece and one second connecting piece, one end of each round pipe is connected to the inner wall of one side of the flue through the corresponding first connecting piece, the other end of each round pipe is connected to the inner wall of the other side of the flue through the corresponding second connecting piece, and a plurality of rib plates are fixed between every two adjacent round pipes;
two adjacent pipes and two adjacent rib plates between the two adjacent pipes form a hollow structure, and steel plates are arranged at two ends of the hollow structure to form a cabin.
The first connecting piece and the second connecting piece both comprise a first support, a connecting steel plate and a second support, wherein the first support is fixed on the inner wall of the flue, the connecting steel plate is fixed on the first support, the second support is fixed on the connecting steel plate, the second support is provided with a through hole, the circular tube is inserted into the through hole, and the insertion depth of the circular tube is smaller than the length of the through hole.
A plurality of notches are formed in the first support along the circumferential direction.
The distance between the round pipe and the connecting steel plate in the corresponding first connecting piece is equal to the distance between the round pipe and the connecting steel plate in the corresponding second connecting piece.
The number of the round pipes is two.
The number of the circular tubes is three, and the axes of the three circular tubes are not in the same plane.
The inner diameter of the through hole in the flue gas upstream second support is 6-8 mm larger than the outer diameter of the flue gas upstream circular tube, and the cross section of the through hole in the flue gas downstream second support is of an oval structure.
The three round pipes are sequentially arranged along the flowing direction of the flue gas, and the inner diameter of a through hole in the second support connected with the middle round pipe is 6-8 mm larger than the outer diameter of the middle round pipe; the cross section of the through hole in the second support connected with the circular tubes on the two sides is of an oval structure.
The utility model discloses following beneficial effect has:
a cut apart storehouse formula guide plate structure for exhaust-heat boiler flaring flue when concrete operation, separate into a plurality of independent cabins through each gusset, with the intensity of strengthening the guide plate, improve the pressure-bearing capacity of guide plate, guarantee the inside guide plate normal steady operation of flaring flue, satisfy SCR deNOx systems flow field index and reach the designing requirement, with adapt to gas turbine export flue gas high temperature, the high velocity of flow, high pressure and rotatory characteristics and flaring flue interior heat retaining structure, guarantee that SCR deNOx systems stabilizes high-efficient economic reliable operation.
Furthermore, enough expansion amount is reserved between the circular tube and the through hole, and the guide plate in the flaring flue is guaranteed not to deform and bear force due to thermal expansion.
Furthermore, a plurality of notches are formed in the first support along the circumferential direction, so that heat transfer of high-temperature flue gas in the flue to the outer wall surface of the flue is reduced, the temperature of the outer wall surface of the flaring flue is reduced, and the safety of an external structure of the boiler is guaranteed.
Drawings
Fig. 1 is a schematic structural view of the present invention when the number of the circular tubes 2 is 2;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic structural view of the present invention when the number of the circular tubes 2 is 3;
FIG. 4 is a cross-sectional view taken along line B-B of FIG. 3;
fig. 5 is a schematic structural view of the first support 4;
FIG. 6 is a cross-sectional view taken along the line C-C in FIG. 5;
FIG. 7 is a schematic structural view of the second support 6 upstream of the flue gas;
FIG. 8 is a cross-sectional view taken along line D-D of FIG. 7;
fig. 9 is a schematic structural view of the second support 6 downstream of the flue gas;
fig. 10 is a cross-sectional view taken in the direction E-E of fig. 9.
Wherein, 1 is the steel sheet, 2 is the pipe, 3 is the gusset, 4 is first support, 5 is the connecting steel plate, 6 is the second support, 7 is the breach, 81 is first connecting piece, 82 is the second connecting piece.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, fig. 2, fig. 3 and fig. 4, the split-bin type deflector structure for the waste heat boiler flaring flue of the present invention includes a plurality of round tubes 2, a plurality of first connecting members 81 and a plurality of second connecting members 82, wherein one round tube 2 corresponds to one first connecting member 81 and one second connecting member 82, one end of the round tube 2 is connected to the inner wall of one side of the flue through the corresponding first connecting member 81, the other end of the round tube 2 is connected to the inner wall of the other side of the flue through the corresponding second connecting member 82, and a plurality of rib plates 3 are fixed between two adjacent round tubes 2; two adjacent circular tubes 2 and two adjacent rib plates 3 between the two circular tubes form a hollow structure, and steel plates 1 are arranged at two ends of the hollow structure to form a cabin.
Referring to fig. 5 to 10, the first connecting member 81 and the second connecting member 82 each include a first support 4, a connecting steel plate 5, and a second support 6, wherein the first support 4 is fixed on the inner wall of the flue, the connecting steel plate 5 is fixed on the first support 4, the second support 6 is fixed on the connecting steel plate 5, the second support 6 is provided with a through hole, the circular tube 2 is inserted into the through hole, the insertion depth of the circular tube 2 is smaller than the length of the through hole, a plurality of notches 7 are formed in the first support 4 along the circumferential direction, and the distance between the connecting steel plates 5 in the circular tube 2 and the corresponding first connecting member 81 is equal to the distance between the connecting steel plates 5 in the circular tube 2 and the corresponding second connecting member 82.
A plurality of rib plates 3 are arranged between the adjacent circular tubes 2, the diameters and the thicknesses of the two circular tubes 2 can be adjusted as required to bear the high pressure generated by the high-speed airflow flowing, and the reasonable design of the supporting structure can improve the uniformity of the speed distribution on the section of the waste heat boiler on the premise of ensuring the safe and reliable operation.
Example one
Referring to fig. 1 and 2, the number of the circular tubes 2 is two, the inner diameter of the through hole in the flue gas upstream second support 6 is 6mm-8mm larger than the outer diameter of the flue gas upstream circular tube 2, the cross section of the through hole in the flue gas downstream second support 6 is an oval structure, and the flow guide plate structure is a flat plate structure.
Example two
Referring to the figures 3 and 4, the number of the circular tubes 2 is three, the axes of the three circular tubes 2 are not in the same plane, the three circular tubes 2 are sequentially arranged along the flow direction of the flue gas, the flow guide plate is of a bent structure, and the inner diameter of a through hole in the second support 6 connected with the middle circular tube 2 is 6mm-8mm larger than the outer diameter of the middle circular tube 2; the cross section of the through hole in the second support 6 connected with the circular tubes 2 at two sides is an oval structure.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious changes and modifications can be made without departing from the scope of the invention.
Claims (8)
1. A partition bin type guide plate structure for a waste heat boiler flaring flue is characterized by comprising a plurality of round pipes (2), a plurality of first connecting pieces (81) and a plurality of second connecting pieces (82), wherein one round pipe (2) corresponds to one first connecting piece (81) and one second connecting piece (82), one end of each round pipe (2) is connected to the inner wall of one side of the flue through the corresponding first connecting piece (81), the other end of each round pipe (2) is connected to the inner wall of the other side of the flue through the corresponding second connecting piece (82), and a plurality of rib plates (3) are fixed between every two adjacent round pipes (2);
two adjacent round tubes (2) and two adjacent rib plates (3) between the two round tubes form a hollow structure, and steel plates (1) are arranged at two ends of the hollow structure to form a cabin.
2. The structure of the split-bin type guide plate for the flaring flue of the waste heat boiler according to claim 1, wherein each of the first connecting piece (81) and the second connecting piece (82) comprises a first support (4), a connecting steel plate (5) and a second support (6), wherein the first support (4) is fixed on the inner wall of the flue, the connecting steel plate (5) is fixed on the first support (4), the second support (6) is fixed on the connecting steel plate (5), the second support (6) is provided with a through hole, the circular tube (2) is inserted into the through hole, and the insertion depth of the circular tube (2) is smaller than the length of the through hole.
3. The structure of the split-bin type flow guide plate for the flaring flue of the waste heat boiler as claimed in claim 2, wherein a plurality of notches (7) are formed in the first support (4) along the circumferential direction.
4. The structure of the divided bin type guide plate for the flaring flue of the waste heat boiler as claimed in claim 2, wherein the distance between the circular tube (2) and the connecting steel plate (5) in the corresponding first connecting piece (81) is equal to the distance between the circular tube (2) and the connecting steel plate (5) in the corresponding second connecting piece (82).
5. The structure of the split-bin type flow guide plate for the flaring flue of the waste heat boiler is characterized in that the number of the circular tubes (2) is two.
6. The structure of the divided bin type guide plate for the flaring flue of the waste heat boiler is characterized in that the number of the circular tubes (2) is three, and the axes of the three circular tubes (2) are not in the same plane.
7. The structure of the divided bin type guide plate for the flaring flue of the waste heat boiler is characterized in that the inner diameter of the through hole in the second flue gas upstream support (6) is 6-8 mm larger than the outer diameter of the circular flue gas upstream pipe (2), and the cross section of the through hole in the second flue gas downstream support (6) is of an oval structure.
8. The structure of the divided bin type flow guide plate for the flaring flue of the waste heat boiler is characterized in that three round pipes (2) are sequentially arranged along the flow direction of flue gas, and the inner diameter of a through hole in a second support (6) connected with the middle round pipe (2) is 6-8 mm larger than the outer diameter of the middle round pipe (2); the cross section of the through hole in the second support (6) connected with the circular tubes (2) at the two sides is of an oval structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020327384.9U CN211837272U (en) | 2020-03-16 | 2020-03-16 | A cut apart storehouse formula guide plate structure for exhaust-heat boiler flaring flue |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020327384.9U CN211837272U (en) | 2020-03-16 | 2020-03-16 | A cut apart storehouse formula guide plate structure for exhaust-heat boiler flaring flue |
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| CN211837272U true CN211837272U (en) | 2020-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020327384.9U Active CN211837272U (en) | 2020-03-16 | 2020-03-16 | A cut apart storehouse formula guide plate structure for exhaust-heat boiler flaring flue |
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| CN (1) | CN211837272U (en) |
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