CN210065684U - Coal water slurry process outer nozzle and burner with low possibility of leakage - Google Patents
Coal water slurry process outer nozzle and burner with low possibility of leakage Download PDFInfo
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- CN210065684U CN210065684U CN201920253201.0U CN201920253201U CN210065684U CN 210065684 U CN210065684 U CN 210065684U CN 201920253201 U CN201920253201 U CN 201920253201U CN 210065684 U CN210065684 U CN 210065684U
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Abstract
A coal water slurry process outer nozzle not prone to leakage belongs to the field of coal chemical industry of coal water slurry pressure gasification, and aims to solve the problem that an inserted fillet weld between a process burner outer nozzle and a short straight pipe is prone to leakage. The outer nozzle is formed by welding an outer end cover, a short straight pipe, a middle section and a tail section, a head circulating water cavity formed by splicing the outer end cover and the middle section needs to be perforated, and then the head circulating water cavity is connected with the short straight pipe through an angle welding seam after being spliced. The utility model discloses the outer end cover and the short straight tube of china and foreign nozzle change integration processing technology into and accomplish, adopt a brand-new structural design and manufacturing method, make by a monoblock forging, cancel the fillet welding process between outer end cover and the short straight tube, make the difficult leakage in circulation water cavity to improve the reliability and the security of technology nozzle operation.
Description
Technical Field
The invention belongs to the field of coal chemical industry of pressurized gasification of coal water slurry, and particularly relates to a coal water slurry process outer nozzle not easy to leak.
Background
The burner of the water-coal-slurry process is a key part of the water-coal-slurry pressure gasification technology, and works in the environment of high temperature and high pressure of 1300 ℃. The known water-coal-slurry process burner structure is composed of an inner nozzle, a middle nozzle and an outer nozzle which are coaxially sleeved from inside to outside and provided with a streamline front closing end, and is in a three-flow type internal-external mixing atomization mode. The outer flow passage and the inner flow passage convey high-pressure oxygen, the middle flow passage conveys high-pressure coal slurry, and the inner flow passage oxygen and the middle flow passage coal slurry are mixed uniformly at the nozzle for atomizing and burning after being half-premixed; the head of the outer nozzle of the process burner is provided with a cooling water cavity which is externally connected with a cooling water coil pipe to carry out cooling protection on the outer nozzle of the process burner.
The process burner usually works under the harsh conditions of high temperature and high pressure, after the nozzle in a high-temperature hearth with the temperature of more than 1000 ℃ runs for a period of time, the outer epoxy channel deforms to cause the flame in the furnace to move upwards, and the head of the outer nozzle is easy to generate high-temperature oxidation corrosion cracks due to high temperature; under the flushing of flame and materials in the furnace, leakage risk often occurs in a cooling water cavity of an outer nozzle, as shown in fig. 3, the outer nozzle of the traditional process burner is welded by an outer end cover 1, a short straight pipe 2, a middle section 3 and a tail section 4, a head circulating water cavity formed by splicing the outer end cover 1 and the middle section 3 needs to be perforated and then is connected with the short straight pipe 2 through an angle welding seam after being spliced. The fillet weld has low strength and large welding stress around, and the fillet weld is positioned on the fire-facing surface of the process burner and is eroded by flame and materials for a long time and influenced by the stress of the cooling water coil connected with the fillet weld, so that the fillet weld is easy to crack to cause the leakage of the process burner and influence the service life of equipment.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the coal water slurry process outer nozzle not easy to leak, the outer nozzle and the cooling water short and straight pipe are integrally processed, the fillet weld between the outer nozzle and the cooling water short and straight pipe on the fire facing surface is eliminated, and the operation reliability of the process burner is improved.
The technical scheme adopted by the invention is as follows:
a coal water slurry process outer nozzle not easy to leak comprises: the outer end cover, the cooling water short straight pipe, the middle section and the tail section;
the outer end cover and the middle section are welded to form a circulating water cavity at the head part of the outer spray head, cooling water circulation of the circulating water cavity is realized through the cooling water short straight pipe, the outer end cover and the cooling water short straight pipe are integrally formed, and a fillet and a chamfer are arranged on the outer surface of the connecting part of the outer end cover and the cooling water short straight pipe, so that stress concentration is avoided; the tail section is connected with the middle section in a welding way.
The inner wall of the circulating water cavity at the fire-facing side is aligned with the inner wall of the cooling water short and straight pipe.
The fire-facing side is provided with a fillet with the size of R2 mm-R10 mm.
A chamfer angle is arranged on the non-fire-facing surface, and the size of the chamfer angle is 3X 35-10X 35 degrees.
The thickness of the fire-facing surface of the outer end cover is 5 mm-10 mm.
A coal water slurry process burner with low possibility of leakage comprises: the inner nozzle, the middle nozzle and the outer nozzle are coaxially sleeved and provided with a streamline front closing end, and the outer nozzle is realized by the coal water slurry process outer nozzle which is not easy to leak.
Compared with the prior art, the invention has the following beneficial effects:
(1) in the burner in the prior art, due to the fact that a water cavity processing structure causes that the joint of the inner wall of a circulating water cavity at the fire-facing side and the inner wall of the cooling water short and straight pipe 2 is provided with a staggered folding angle and a gap, cooling water can flow in a folding manner at the joint, the flow of water flow at the joint is blocked in a high-speed flowing state, and folding backflow and even local short circuit are easy to generate. The inner wall of the circulating water cavity on the fire-facing side of the invention is aligned with the inner wall of the cooling water short and straight pipe 2, so that the cooling water can directly impact the sharp corner of the outer nozzle at high speed at the inlet of the short and straight pipe, the flowing speed of the heat exchange surface is improved, theoretical calculation results show that the average surface heat exchange coefficient of the structure of the invention is improved by more than 20 percent, the convection heat exchange effect at the sharp corner of the outer nozzle is greatly enhanced, and the cooling effect of the outer end cover is optimized.
(2) And a fillet and a chamfer are arranged on the outer profile of the connecting part of the process burner outer end cover 1 and the cooling water short and straight pipe 2. Theoretical calculation, experiments and actual operation analysis summarize, the stress directions of the fire-facing surface and the non-fire-facing surface are different, and different processing methods are adopted to optimize the using effect of the outer spray head:
the fire-facing surface is designed into a fillet, the fillet can uniformly disperse the positive tensile stress of the root of the short straight pipe, so that the local stress concentration is avoided to the maximum extent, the stress peak value is eliminated, and the occurrence of cracks at the root of the cooling water of the fire-facing surface of the outer spray head is slowed down; the fillet size ranges from R2mm to R10mm according to different specifications of the outer end cover. The calculation result shows that the stress peak value of the root of the short straight pipe of the outer end cover with the same specification is reduced along with the increase of the fillet, but the maximum value of the fillet is limited by the profile processing of the outer end cover; when the fillet is smaller than R2mm, the stress at the root of the short straight pipe is increased sharply, and obvious stress concentration occurs, so the fillet smaller than R2 at the fire head face is avoided in the processing.
The chamfer design at the non-fire-facing side can increase the structural rigidity of the root at the non-fire-facing side of the short straight pipe 2, effectively resist the compressive stress deformation borne by the non-fire-facing side, reduce the macroscopic material deformation of the short straight pipe, reduce the material deformation stress and indirectly relieve the forward tensile stress of the root at the fire-facing side. In practical use, the root of the short straight pipe of the outer nozzle rarely generates material failure on the non-fire-facing surface because the material at the root mainly bears compressive stress, the compressive strength of the material is very high and is far greater than the actual bearing stress, and therefore the structural design of the non-fire-facing surface mainly considers the reduction of the compression deformation of the material and indirectly relieves the forward tensile stress of the root on one side of the fire-facing surface. According to different specifications of the outer end cover, the size range of the chamfer is 3X 35-10X 35 degrees. The calculation result shows that the deformation of the short straight pipe is reduced along with the increase of the chamfer under the same stress environment of the outer end covers with the same specification, but the chamfer processing is limited by the profile processing and the welding groove of the outer end covers and is not suitable to be overlarge; when the chamfer angle is less than 3X35 degrees, the deformation of the root of the short straight pipe is obviously increased, so the chamfer angle less than 3X35 degrees at the non-fire-facing surface is avoided in the processing.
(3) According to the coal water slurry process outer nozzle not prone to leakage, the outer nozzle and the cooling water short straight pipe are integrally processed, welding seams between the outer nozzle and the cooling water short straight pipe on the fire-facing surface are eliminated, the number of parts of the outer nozzle is reduced through integral forging processing, and the processing and manufacturing flow is simplified; the stress resistance strength of the integral piece is greatly superior to that of a welding part, the leakage probability of the process burner is reduced, and the reliability and the safety of the operation of the process burner are enhanced.
Drawings
FIG. 1 is a cross-sectional view of an outer nozzle of a coal water slurry process burner not prone to leakage according to the present invention;
FIG. 2 is a partial enlarged view of an outer end cover and a short straight tube of an outer nozzle of the burner of the process of the invention;
FIG. 3 is a cross-sectional view of an outer nozzle of a burner of a conventional coal water slurry process;
FIG. 4 is a partial enlarged view of an outer end cover and a short straight pipe of an outer nozzle of a burner of a conventional coal water slurry process;
FIG. 5 shows the internal stress distribution (stress unit: MPa) of the material on the fire-facing side of the root of the short straight pipe.
Detailed Description
The invention provides a coal water slurry process outer nozzle which is not easy to leak. The technical key points for realizing the invention are as follows: the outer end cover 1 and the short straight pipe 2 are changed into an integrated processing technology to be finished, a brand new structure design and manufacturing method is adopted, the outer end cover is made of a whole forged piece, an angle welding procedure between the outer end cover 1 and the short straight pipe 2 is cancelled, a circulating water cavity is not easy to leak, and therefore the operation reliability and safety of the process burner are improved; meanwhile, one welding process can be reduced, the labor intensity is reduced, the working efficiency is improved, and the processing and production cost is saved.
Specifically, as shown in fig. 1 and 2, the present invention provides a coal water slurry process external nozzle with low leakage probability, which comprises: the outer end cover 1, the cooling water short and straight pipe 2, the middle section 3 and the tail section 4;
the outer end cover 1 and the middle section 3 are welded to form a circulating water cavity at the head part of the outer spray head, cooling water circulation of the circulating water cavity is realized through the cooling water short and straight pipe 2, the outer end cover 1 and the cooling water short and straight pipe 2 are integrally formed, and a fillet and a chamfer are arranged on the outer profile of the connecting part of the outer end cover 1 and the cooling water short and straight pipe 2, so that stress concentration is avoided; the tail section 4 is connected with the middle section 3 in a welding way.
The inner wall of the circulating water cavity on one side of the fire-facing surface is aligned with the inner wall of the cooling water short and straight pipe 2, so that cooling water can directly impact the sharp corner of the outer nozzle at a high speed at the inlet of the short and straight pipe, the flowing speed of the heat exchange surface is improved, the convection heat exchange effect at the sharp corner of the outer nozzle is enhanced, and the theoretical calculation result shows that the average surface heat exchange coefficient of the structure is improved by more than 20%. In the traditional process burner, due to the fact that the water cavity processing structure causes the joint of the inner wall of the circulating water cavity on the fire-facing side and the inner wall of the cooling water short and straight pipe 2 to be provided with staggered folding angles and gaps, as shown in fig. 4, cooling water can flow in a folding mode at the joint, and water flow in a high-speed flowing state easily generates folding backflow or even local short circuit, so that the cooling effect of the outer end cover is influenced. The inner walls of the outer spray heads of the coal water slurry process which are not easy to leak are aligned, so that the phenomenon that cooling water flows in a turning way at the position of a traditional process burner is effectively avoided, and the heat convection environment of the outer spray heads is optimized.
The outer nozzle works in a high-temperature hearth above 1000 ℃, the outer end cover 1 is heated and extends outwards to a large extent along the axial direction, and the cooling water coil pipe connected with the short and straight pipe 2 has smaller deformation due to lower temperature, so that the connection part of the outer end cover 1 and the short and straight pipe 2 of the cooling water can generate larger thermal stress, and the heat stress directions of the fire-facing surface and the non-fire-facing surface of the connection part are different, so that different designs are needed.
The material at the fire-facing surface of the root of the short straight pipe is subjected to tensile stress, and the fillet is designed at the position, so that the fillet can uniformly disperse the positive tensile stress of the root of the short straight pipe, the local stress concentration is avoided to the maximum extent, the stress peak value is eliminated, and the occurrence of cracks at the root of the cooling water of the fire-facing surface of the outer spray head is slowed down; the fillet size ranges from R2mm to R10mm according to different specifications of the outer end cover. Under the same thermal stress condition, stress conditions of different fillets are calculated and compared, the calculation result is shown in fig. 5, the stress distribution condition of the fillet R10 is the best, the maximum value of the stress is not high, the stress distribution range is more uniform, the stress gradient is the minimum, when the fillet is reduced to R2, the peak value of the stress of the material surface is increased by 70%, and the stress distribution uniformity is also deteriorated; if the fillet continues to be reduced, the stress distribution condition on the surface of the material can be sharply deteriorated to form stress concentration points, the stress is excessively concentrated, the peak value exceeds the high-temperature stress intensity of the material, and the stress concentration points are extremely easy to become the starting points of material failure, so that equipment leakage is caused. In conclusion, the stress peak value at the fire-facing surface of the root of the short straight pipe is reduced along with the increase of the fillet, but the maximum value of the fillet is limited by the profile processing of the outer end cover; when the fillet is smaller than R2mm, the stress at the root of the short straight pipe is increased sharply, and obvious stress concentration occurs, so the fillet smaller than R2 at the fire head face is avoided in the processing.
And (3) designing a chamfer angle at the material compressive stress at the non-fire-facing surface at the root of the short straight pipe, wherein the size range of the chamfer angle is 3X 35-10X 35 degrees according to different specifications of the outer end cover. The chamfer design can increase the structural rigidity of the root on one side of the non-fire-facing surface of the short straight pipe 2, effectively resist the compressive stress deformation borne by the non-fire-facing surface, reduce the macroscopic material deformation of the short straight pipe, reduce the material deformation stress and indirectly relieve the forward tensile stress of the root on one side of the fire-facing surface. In practical use, the root of the short straight pipe of the outer nozzle rarely generates material failure on the non-fire-facing surface because the material at the root mainly bears compressive stress, the compressive strength of the material is very high and is far greater than the actual bearing stress, and therefore the structural design of the non-fire-facing surface mainly considers the reduction of the compression deformation of the material and indirectly relieves the forward tensile stress of the root on one side of the fire-facing surface. Under the same thermal stress condition, chamfers with different sizes are designed on the non-fire-facing side of the root of the short straight pipe, the calculated deformation result of the short straight pipe is shown in table 1, the calculated result shows that the deformation of the short straight pipe is reduced along with the increase of the chamfers when the outer end covers with the same specification are in the same stress environment, but the chamfer processing is limited by the profile processing and the welding groove of the outer end cover, and is not suitable for being overlarge; when the chamfer angle is less than 3X35 degrees, the deformation of the root of the short straight pipe is obviously increased, so the chamfer angle less than 3X35 degrees at the non-fire-facing surface is avoided in the processing.
TABLE 1 calculated deformation of different chamfers on non-fire-facing side of short straight pipe root
The outer spray head is used by considering not only the end surface temperature field but also the influence of thermal stress on the material, and the more violent the temperature change and the larger the gradient in the material, the more easily the material is damaged by the thermal stress. According to theoretical calculation and practical application summary, the thickness of the fire-facing surface of the outer end cover 1 is 5 mm-10 mm, and in the thickness range, the outer end cover can give consideration to the influences of material strength and thermal stress, so that the outer end cover can achieve a better service life.
The coal water slurry process burner not easy to leak is verified by practical engineering application, has excellent use effect, greatly reduces the leakage probability of the process burner, enhances the reliability and safety of the operation of the process burner, and improves the average service life of the process burner by more than 50 percent compared with the traditional process burner.
Further, based on the outer nozzle, the invention also provides a coal water slurry process burner which is not easy to leak, comprising: the inner nozzle, the middle nozzle and the outer nozzle are coaxially sleeved and provided with a streamline front closing end, and the outer nozzle is realized by adopting the coal water slurry process outer nozzle which is not easy to leak.
The invention changes the processing and manufacturing process of the external nozzle of the burner in the traditional process of firstly turning and then welding, adopts a brand new manufacturing process, and the specific processing implementation scheme of the external nozzle is as follows:
1. roughly turning the circumferential continuous conical surface on the inner side of the outer end cover 1 by using a lathe to finish rough machining, namely finishing rough machining of a gas channel nozzle;
2. integrally milling the inner wall of the circulating water cavity at one side of the outer end cover 1 and the inner wall of the cooling water short and straight pipe 2 by using a milling machine to finish the integral milling of the inner wall; the inner wall of the circulating water cavity at one side of the fire-facing surface of the outer end cover 1 is aligned with the inner wall of the cooling water short and straight pipe 2, and the thickness of the fire-facing surface of the outer end cover 1 is 5-10 mm;
3. integrally processing the outer wall of the circulating water cavity of the outer end cover 1 and the outer wall of the cooling water short and straight pipe 2; the outer surface of the connecting part of the outer end cover 1 and the cooling water short and straight pipe 2 is provided with a fillet and a chamfer, the fire-facing surface is provided with a fillet, the fillet is in the size range of R2 mm-R10 mm, the non-fire-facing surface is provided with a chamfer, the chamfer is in the size range of 3X 35-10X 35 degrees, and all fillets and chamfers are in smooth transition with the outer surface of the outer end cover 1;
4. the inner wall of the circulating water cavity at one side of the middle section 3 is machined by a lathe, and then the inner side and the outer side of the middle section 3 and the tail section 4 are machined by the lathe;
5. splicing the outer end cover 1, the middle section 3 and the tail section 4 in a welding mode to finish the combined processing of the gas channel of the outer nozzle;
6. finely machining the nozzle and the shape of the outer nozzle according to the size of the drawing;
7. and (5) processing the outer surface of the outer nozzle by using grinding equipment to make the outer surface smooth.
Claims (10)
1. The utility model provides a difficult outer shower nozzle of coal slurry technology that leaks which characterized in that includes: the outer end cover (1), the cooling water short straight pipe (2), the middle section (3) and the tail section (4);
the outer end cover (1) and the middle section (3) are welded to form a circulating water cavity at the head part of the outer spray head, cooling water circulation of the circulating water cavity is realized through the cooling water short and straight pipe (2), the outer end cover (1) and the cooling water short and straight pipe (2) are integrally formed, and a fillet and a chamfer are arranged on the outer surface of the connecting part of the outer end cover (1) and the cooling water short and straight pipe (2) to avoid stress concentration; the tail section (4) is connected with the middle section (3) in a welding way.
2. The outer nozzle of claim 1 for a coal water slurry process, which is not easy to leak, characterized in that: the inner wall of the circulating water cavity at the fire-facing side is aligned with the inner wall of the cooling water short and straight pipe (2).
3. The outer nozzle of claim 1 for a coal water slurry process, which is not easy to leak, characterized in that: the fire-facing side is provided with a fillet with the size of R2 mm-R10 mm.
4. The outer nozzle of claim 1 for a coal water slurry process, which is not easy to leak, characterized in that: a chamfer angle is arranged on the non-fire-facing surface, and the size of the chamfer angle is 3X 35-10X 35 degrees.
5. The outer nozzle of claim 1 for a coal water slurry process, which is not easy to leak, characterized in that: the thickness of the fire-facing surface of the outer end cover (1) is 5 mm-10 mm.
6. A coal water slurry process burner difficult to leak is characterized by comprising: the inner nozzle, the middle nozzle and the outer nozzle are coaxially sleeved and provided with streamline front closing ends, and the outer nozzle is realized by the coal water slurry process outer nozzle which is not easy to leak according to claim 1.
7. The coal-water slurry process burner difficult to leak according to claim 6, characterized in that: the inner wall of the circulating water cavity at the fire-facing side is aligned with the inner wall of the cooling water short and straight pipe (2).
8. The coal-water slurry process burner difficult to leak according to claim 6, characterized in that: the outer profile of the connecting part of the outer end cover (1) and the cooling water short and straight pipe (2) is provided with a fillet and a chamfer, and the fire-facing surface is a fillet with the size of R2 mm-R10 mm.
9. The coal-water slurry process burner difficult to leak according to claim 8, characterized in that: the non-fire-facing surface is a chamfer with the size of 3X 35-10X 35 degrees.
10. The coal-water slurry process burner difficult to leak according to claim 6, characterized in that: the thickness of the fire-facing surface of the outer end cover (1) is 5 mm-10 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920253201.0U CN210065684U (en) | 2019-02-28 | 2019-02-28 | Coal water slurry process outer nozzle and burner with low possibility of leakage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920253201.0U CN210065684U (en) | 2019-02-28 | 2019-02-28 | Coal water slurry process outer nozzle and burner with low possibility of leakage |
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| CN210065684U true CN210065684U (en) | 2020-02-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109797009A (en) * | 2019-02-28 | 2019-05-24 | 北京航化节能环保技术有限公司 | A kind of outer spray head of antileakaging coal water slurry process and its processing method |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109797009A (en) * | 2019-02-28 | 2019-05-24 | 北京航化节能环保技术有限公司 | A kind of outer spray head of antileakaging coal water slurry process and its processing method |
| CN109797009B (en) * | 2019-02-28 | 2024-03-26 | 北京航化节能环保技术有限公司 | Coal water slurry process outer spray head not easy to leak and processing method thereof |
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