Boiler reheating water spraying desuperheater

Abstract

The utility model relates to a boiler reheating water spraying desuperheater which comprises a desuperheater barrel. An inner sleeve; the cylinder seat is vertically arranged outside the desuperheater cylinder body, and the bottom of the cylinder seat is welded and fixed with the outer side wall of the desuperheater cylinder body; the upper portion of the water spraying pipe is located outside the cylinder base, and the lower portion of the water spraying pipe vertically penetrates through the cylinder base, the side wall of the desuperheater cylinder and the side wall of the inner sleeve in sequence and is located in the inner sleeve. The upper part of the water spraying pipe is fixedly welded with the top surface of the cylinder seat, a plug is arranged at the lower end of the water spraying pipe, and a plurality of water spraying holes are formed in the water spraying pipe; the fixing plate is located in the cylinder base, and the lower portion of the fixing plate sequentially penetrates through the side wall of the desuperheater cylinder and the side wall of the inner sleeve and is located in the inner sleeve; the side wall of the water spraying pipe is arranged close to the side wall of the cylinder base, one side of the fixing plate is fixedly welded to the side wall of the water spraying pipe, and the other side of the fixing plate is arranged close to the side wall of the cylinder base. The desuperheater can effectively solve the problem that the desuperheater of the thermal power plant easily causes steam leakage, and is reliable and stable in operation.

Description

Technical Field

[0001] The utility model relates to the technical field of steam temperature regulation of a steam-water system of a boiler of a thermal power generating set, in particular to a boiler reheating water spraying desuperheater. Background Art

[0002] The first-phase boiler of a certain factory is a subcritical natural circulation drum boiler. The boiler body adopts a single furnace π-type layout, one-time reheating, balanced ventilation, double flues at the rear, and a semi-open island layout. The rear smoke shaft is a front and rear double flue. The front flue is equipped with a low-temperature reheater, and the rear flue is equipped with a low-temperature superheater and economizer from top to bottom. Flue adjustment dampers are arranged at the front and rear flue outlets. By adjusting the flue gas flow of the front and rear flues, and supplemented by a reheating micro-spray water desuperheater, the reheat steam temperature can be adjusted to meet the needs of boiler operating conditions.

[0003] However, in actual applications, the reheat micro-spray desuperheater is rarely put into use, the internal spray device is in a high-temperature and high-pressure steam environment for a long time, and the design of the spray device is relatively complex, with many welds and dissimilar steel joints. When the desuperheater is put into use, the spray device is prone to brittle fracture under the stress of alternating cold and hot, causing the desuperheating water to be directly sprayed on the inner wall of the desuperheater, causing the pipe seat to crack and steam to leak, seriously affecting the safe and stable operation of the unit.

[0004] For example, in an existing solution, the pipe seat of the reheat micro-spray water desuperheater is connected to the spray pipe by flange connection, and the spray pipe is also connected by flange connection; two spray devices are welded on the spray pipe, the spray pipe material is 12Cr1MoVG, the spray device material is TP304, each spray device has 7 spray holes, and is composed of a throttle ring, an end cover nut, etc. This solution has the following shortcomings:

[0005] (1) Flange connection is prone to leakage at the flange interface during unit operation;

[0006] (2) The design of the water spray device is relatively complex, the end cover nut is easy to loosen, and the welding uses dissimilar steel joints. Under the alternating stress of hot and cold, the water spray device is easy to break and fall off;

[0007] (3) If the water spray device breaks, the cooling water will be sprayed directly onto the inner wall of the desuperheater cylinder, causing the pipe seat and cylinder to crack and resulting in steam leakage. Utility Model Content

[0008] The utility model aims to provide a boiler reheating water spray desuperheater, which can effectively solve the problem that the desuperheater of a thermal power plant is prone to steam leakage, and has reliable and stable operation.

[0009] The purpose of the utility model is achieved in this way: a boiler reheating water spray desuperheater, comprising:

[0010] Horizontally arranged desuperheater cylinder;

[0011] The inner sleeve is coaxially and spaced apart and penetrates the desuperheater cylinder;

[0012] A cylinder seat with an open bottom and a closed top is vertically arranged outside the cylinder of the desuperheater, and the bottom of the cylinder seat is welded and fixed to the outer wall of the cylinder of the desuperheater;

[0013] The water spray pipe has an upper portion located outside the cylinder seat, and a lower portion vertically passes through the cylinder seat, the side wall of the desuperheater cylinder, and the side wall of the inner sleeve in sequence and is located inside the inner sleeve; the upper portion of the water spray pipe is welded and fixed to the top surface of the cylinder seat, a plug is provided at the lower end of the water spray pipe, and a plurality of water spray holes are opened on the water spray pipe and located inside the inner sleeve;

[0014] The fixing plate is located in the cylinder seat, and the lower part of the fixing plate passes through the side wall of the cooler cylinder and the side wall of the inner sleeve in sequence and is located in the inner sleeve; the water spray pipe is eccentrically arranged with the cylinder seat, the side wall of the water spray pipe is arranged close to the side wall of the cylinder seat, one side of the fixing plate is welded and fixed to the side wall of the water spray pipe, and the other side is arranged close to the side wall of the cylinder seat.

[0015] In a preferred embodiment of the present invention, a first mounting hole is opened on the top of the side wall of the desuperheater cylinder, and a second mounting hole is opened on the top of the side wall of the inner sleeve, and the water spray pipe and the fixing plate can pass through the first mounting hole and the second mounting hole.

[0016] In a preferred embodiment of the utility model, the plug is welded and fixed to the water spray pipe, and a slot is opened at the bottom of the plug; a first threaded hole is opened at the bottom of the side wall of the cooler cylinder, and a first insertion hole is opened at the bottom of the side wall of the inner sleeve; the inner end portion of a supporting pin passes through the first threaded hole and the first insertion hole in sequence and can be inserted and fixed in the slot, and the outer end portion of the supporting pin is threadedly connected to the first threaded hole and is welded and fixed to the outer side wall of the cooler cylinder.

[0017] In a preferred embodiment of the present invention, a preset gap is left between the lower end of the water spray pipe and the inner side wall of the inner sleeve.

[0018] In a preferred embodiment of the present invention, the preset gap is 10-15 mm.

[0019] In a preferred embodiment of the present invention, the first end of the inner sleeve is fixedly connected to the side wall of the desuperheater cylinder by a plurality of fasteners, and the middle portion and the second end of the inner sleeve are circumferentially positioned by a plurality of positioning members.

[0020] In a preferred embodiment of the utility model, a plurality of second threaded holes are circumferentially spaced apart on the side wall of the cooler cylinder, and a plurality of second insertion holes are circumferentially spaced apart on the side wall of the inner sleeve; the inner end portion of the fastener passes through the second threaded holes and the second insertion holes in sequence to extend into the inner sleeve, and is welded and fixed to the inner side wall of the inner sleeve; the outer end portion of the fastener is threadedly connected to the second threaded hole, and is welded and fixed to the outer wall of the cooler cylinder.

[0021] In a preferred embodiment of the present invention, a first positioning ring is welded on the outer wall of the first end of the inner sleeve, and the step on the fastener can abut against the outer side wall of the first positioning ring.

[0022] In a preferred embodiment of the present invention, a plurality of third threaded holes are circumferentially spaced apart on the side wall of the cooler cylinder, the positioning member passes through the third threaded holes and can abut against the outer wall of the inner sleeve, and the outer end of the positioning member is threadedly connected to the third threaded hole and is welded and fixed to the outer wall of the cooler cylinder.

[0023] In a preferred embodiment of the present invention, a second positioning ring is welded to both the middle outer wall and the second end outer wall of the inner sleeve, and the inner end of the positioning member can abut against the outer side wall of the corresponding second positioning ring.

[0024] As described above, the boiler reheating water spray desuperheater of the utility model uses a cylindrical cylinder seat to install the water spray pipe, the water spray pipe and the cylinder seat are welded and fixed, the water spray pipe passes through the cylinder seat and a fixing plate design is added, the cylinder seat, the water spray pipe and the fixing plate are welded to the cylinder of the desuperheater through the cylinder seat, which changes the flange connection installation method of the water spray pipe in the prior art, and reduces the risk of steam leakage caused by flange seal failure; at the same time, the cooperation of the fixing plate can prevent the left and right shaking of the water spray pipe during operation, and the operation is more stable and reliable. In addition, the existing water spray device is simplified, and the water spray hole opened on the water spray pipe is directly used as the water spray device, and there is no redundant and complicated water spray device, which eliminates the hidden danger of water spray device breakage and ensures safer and more stable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The following drawings are only intended to illustrate and explain the present invention, and do not limit the scope of the present invention.

[0026] Figure 1 : It is a structural schematic diagram of the boiler reheat water spray desuperheater provided by the utility model.

[0027] Figure 2 : A cross-sectional view of the boiler reheat water spray desuperheater provided by the utility model at the water spray pipe.

[0028] Figure 3: A cross-sectional view of the boiler reheat water spray desuperheater provided by the utility model at the first end of the inner sleeve.

[0029] Figure 4 : A cross-sectional view of the boiler reheat water spray desuperheater provided by the utility model at the second end of the inner sleeve.

[0030] Description of Figure Numbers:

[0031] 1. Desuperheater cylinder; 11. First mounting hole;

[0032] 2. Inner sleeve; 21. Second mounting hole; 22. Fastener; 23. Positioning member; 24. First positioning ring; 25. Second positioning ring;

[0033] 3. Cartridge seat;

[0034] 4. water spray pipe; 41. plug; 42. water spray hole; 43. support pin;

[0035] 5. Fixed plate. DETAILED DESCRIPTION

[0036] In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation methods of the utility model are now described with reference to the accompanying drawings.

[0037] like Figures 1 to 4 As shown, this embodiment provides a boiler reheat water spray desuperheater, comprising:

[0038] A horizontally arranged desuperheater cylinder 1;

[0039] The inner sleeve 2 is coaxially and spacedly arranged in the desuperheater cylinder 1;

[0040] The cylinder seat 3 with an open bottom and a closed top is vertically arranged outside the desuperheater cylinder 1, and the bottom of the cylinder seat 3 is welded and fixed to the outer side wall of the desuperheater cylinder 1;

[0041] The water spray pipe 4 has an upper portion located outside the cylinder seat 3, and a lower portion vertically passes through the cylinder seat 3, the side wall of the desuperheater cylinder 1, and the side wall of the inner sleeve 2 in sequence and is located inside the inner sleeve 2; the upper portion of the water spray pipe 4 is welded and fixed to the top surface of the cylinder seat 3, a plug 41 is provided at the lower end of the water spray pipe 4, and a plurality of water spray holes 42 are opened on the water spray pipe 4 and located inside the inner sleeve 2;

[0042] The fixing plate 5 is located in the cylinder seat 3, and the lower part thereof passes through the side wall of the desuperheater cylinder 1 and the side wall of the inner sleeve 2 in sequence and is located in the inner sleeve 2; the water spray pipe 4 is eccentrically arranged with the cylinder seat 3, and the side wall of the water spray pipe 4 is arranged close to the side wall of the cylinder seat 3; one side of the fixing plate 5 is welded and fixed to the side wall of the water spray pipe 4, and the other side is arranged close to the side wall of the cylinder seat 3.

[0043] Among them, the boiler reheat water spray cooler is specifically a boiler reheat micro-water spray cooler for a thermal power generating unit. The cross-sections of the cooler cylinder 1, inner sleeve 2, cylinder seat 3 and water spray pipe 4 are all circular. The cylinder seat 3 and water spray pipe 4 are both vertically arranged, and the plate surface of the fixed plate 5 is also vertically arranged. A preset interval is left between the outer wall of the inner sleeve 2 and the inner wall of the cooler cylinder 1. The arrangement of the inner sleeve 2 can prevent the water spray pipe 4 from spraying on the inner wall of the cooler cylinder 1 when spraying water; the lower part of the water spray pipe 4 is located in the inner sleeve 2, which can further prevent the water from spraying on the inner wall of the cooler cylinder 1 when spraying water. The side of the water spray pipe 4 is basically against the inner wall of the cylinder seat 3, and there is only a small gap between the two; the side of the fixed plate 5 away from the water spray pipe 4 is basically against the corresponding inner wall of the cylinder seat 3, and there is only a small gap between the two. The specific positions of the multiple water spray holes 42 can be arranged according to Figure 1 The water spray holes 42 are distributed at positions close to the center line of the inner sleeve 2. The specific number of the water spray holes 42 is determined according to needs. For example, 14 water spray holes 42 are opened in this embodiment.

[0044] Therefore, the boiler reheating water spray desuperheater in this embodiment uses a cylindrical cylinder seat 3 to install the water spray pipe 4, the water spray pipe 4 is welded and fixed to the cylinder seat 3, the water spray pipe 4 passes through the cylinder seat 3 and a fixing plate 5 is added. The cylinder seat 3, the water spray pipe 4 and the fixing plate 5 are welded to the desuperheater cylinder 1 through the cylinder seat 3, which changes the flange connection installation method of the water spray pipe 4 in the prior art, and reduces the risk of steam leakage caused by flange seal failure; at the same time, the cooperation of the fixing plate 5 can prevent the water spray pipe 4 from shaking left and right during operation, and the operation is more stable and reliable. In addition, the existing water spray device is simplified, and the water spray hole 42 opened on the water spray pipe 4 is directly used as the water spray device, and there is no redundant and complicated water spray device, which eliminates the hidden danger of water spray device breakage and ensures safer and more stable operation.

[0045] It can be understood that a first mounting hole 11 is opened at the top of the side wall of the desuperheater cylinder 1, and a second mounting hole 21 is opened at the top of the side wall of the inner sleeve 2, and the water spray pipe 4 and the fixing plate 5 can pass through the first mounting hole 11 and the second mounting hole 21.

[0046] The first mounting hole 11 is generally a circular hole, and the cylinder seat 3 is arranged opposite to the first mounting hole 11 and welded to the desuperheater cylinder 1 at the periphery of the first mounting hole 11. The shape of the second mounting hole 21 can match the shape of the water spray pipe 4 and the fixing plate 5. For example, the second mounting hole 21 can include a circular hole and a long hole connected to each other, so as to allow the water spray pipe 4 and the fixing plate 5 to pass through respectively.

[0047] In order to further improve the structural stability of the water spray pipe 4, the plug 41 is welded and fixed to the water spray pipe 4, and a slot is opened at the bottom of the plug 41; a first threaded hole is opened at the bottom of the side wall of the cooler cylinder 1, and a first insertion hole is opened at the bottom of the side wall of the inner sleeve 2; the inner end of a support pin 43 passes through the first threaded hole and the first insertion hole in turn and can be inserted and fixed in the slot, and the outer end of the support pin 43 is threadedly connected to the first threaded hole and welded to the outer wall of the cooler cylinder 1.

[0048] The bottom of the water spray pipe 4 adopts an external support pin 43, which is threaded and welded to the desuperheater cylinder 1, and a plug 41 is welded to the lower end of the water spray pipe 4 and inserted into the support pin 43, which is not only convenient for construction, but also more stable and not easy to fall off. In case the support pin 43 falls off, it is also convenient for construction workers to find it in time, which is safer.

[0049] Due to thermal expansion and contraction during operation, the water spray pipe 4 will extend or shorten in the axial direction. In this embodiment, a preset gap is left between the lower end of the water spray pipe 4 and the inner wall of the inner sleeve 2. The preset gap is 10-15mm, which can ensure that the water spray pipe 4 can expand freely up and down during operation.

[0050] Further preferably, the first end of the inner sleeve 2 is fixedly connected to the side wall of the desuperheater cylinder 1 by a plurality of fasteners 22 , and the middle portion and the second end of the inner sleeve 2 are circumferentially positioned by a plurality of positioning members 23 .

[0051] During operation, due to thermal expansion and contraction, the inner sleeve 2 will also have axial extension or contraction. In this embodiment, the first end of the inner sleeve 2 is fixedly connected to the desuperheater cylinder 1, and the middle part and the second end of the inner sleeve 2 are only circumferentially positioned but not axially fixed, so that except for the first end of the inner sleeve 2, the rest of the inner sleeve 2 can slide relatively in the horizontal direction to adapt to thermal expansion and contraction, so that the structure is more stable and the safety is higher.

[0052] More specifically, in order to facilitate fixing the first end of the inner sleeve 2, refer to Figure 3 A plurality of second threaded holes are circumferentially spaced apart on the side wall of the cooler barrel 1, and a plurality of second insertion holes are circumferentially spaced apart on the side wall of the inner sleeve 2; the inner end of the fastener 22 passes through the second threaded holes and the second insertion holes in sequence to extend into the inner sleeve 2, and is welded and fixed to the inner side wall of the inner sleeve 2; the outer end of the fastener 22 is threadedly connected to the second threaded hole, and is welded and fixed to the outer wall of the cooler barrel 1.

[0053] In order to facilitate the fixing of the middle and second ends of the inner sleeve 2, refer to Figure 4A plurality of third threaded holes are circumferentially spaced apart on the side wall of the cooler cylinder 1. The positioning member 23 passes through the third threaded holes and can abut against the outer wall of the inner sleeve 2. The outer end of the positioning member 23 is threadedly connected to the third threaded hole and is welded and fixed to the outer wall of the cooler cylinder 1.

[0054] Among them, a plurality of second threaded holes are evenly distributed along the circumference and arranged corresponding to the first end of the inner sleeve 2. The positions of each second jack are arranged radially opposite to the positions of each second threaded hole, and the number of second threaded holes is the same as the number of second jacks. A plurality of third threaded holes are evenly arranged circumferentially on the cooler barrel 1 corresponding to the middle of the inner sleeve 2, and a plurality of third threaded holes are evenly opened circumferentially on the cooler barrel 1 corresponding to the second end of the inner sleeve 2. The specific number of second threaded holes and third threaded holes can be determined as needed. For example, in this embodiment, a total of four second threaded holes are provided, four third threaded holes are provided corresponding to the middle of the inner sleeve 2, and four third threaded holes are provided corresponding to the second end of the inner sleeve 2. The fastener 22 can be, for example, a fixing pin, and the positioning member 23 can be, for example, a positioning pin.

[0055] In order to ensure the structural stability of the connection position, a first positioning ring 24 is welded on the outer wall of the first end of the inner sleeve 2, and the step on the fastener 22 can abut against the outer wall of the first positioning ring 24. Second positioning rings 25 are welded on the middle outer wall and the second end outer wall of the inner sleeve 2, and the inner end of the positioning member 23 can abut against the outer wall of the corresponding second positioning ring 25.

[0056] In an application example, the boiler reheat water spray desuperheater in this embodiment is applied to a boiler of a certain thermal power plant unit. After implementation, the system operates reliably and in good condition, meeting the process requirements.

[0057] The above is only an illustrative embodiment of the utility model, and is not intended to limit the scope of the utility model. Any equivalent changes and modifications made by any technician in the field without departing from the concept and principle of the utility model should fall within the scope of protection of the utility model.

Claims

1. A boiler reheat spray desuperheater, characterized in that: include: Horizontally arranged desuperheater cylinder; An inner sleeve is coaxially and spacedly arranged in the desuperheater cylinder; A cylinder seat with an open bottom and a closed top is vertically arranged outside the cylinder of the desuperheater, and the bottom of the cylinder seat is welded and fixed to the outer side wall of the cylinder of the desuperheater; A water spray pipe, the upper portion of which is located outside the cylinder seat, and the lower portion of which vertically passes through the cylinder seat, the side wall of the desuperheater cylinder and the side wall of the inner sleeve in sequence and is located inside the inner sleeve; the upper portion of the water spray pipe is welded and fixed to the top surface of the cylinder seat, a plug is provided at the lower end of the water spray pipe, and a plurality of water spray holes are opened on the water spray pipe and located inside the inner sleeve; A fixing plate is located in the cylinder seat, and its lower part passes through the side wall of the cooler cylinder and the side wall of the inner sleeve in sequence and is located in the inner sleeve; the water spray pipe is eccentrically arranged with the cylinder seat, and the side wall of the water spray pipe is arranged close to the side wall of the cylinder seat; one side of the fixing plate is welded and fixed to the side wall of the water spray pipe, and the other side is arranged close to the side wall of the cylinder seat.

2. The boiler reheat spray desuperheater according to claim 1, characterized in that: A first mounting hole is provided at the top of the side wall of the desuperheater cylinder, and a second mounting hole is provided at the top of the side wall of the inner sleeve. Both the water spray pipe and the fixing plate can pass through the first mounting hole and the second mounting hole.

3. The boiler reheat spray desuperheater according to claim 1, characterized in that: The plug is welded and fixed to the water spray pipe, and a slot is provided at the bottom of the plug; A first threaded hole is provided at the bottom of the side wall of the cooler cylinder, and a first insertion hole is provided at the bottom of the side wall of the inner sleeve; the inner end portion of a supporting pin passes through the first threaded hole and the first insertion hole in sequence and can be inserted and fixed in the slot, and the outer end portion of the supporting pin is threadedly connected to the first threaded hole and is welded and fixed to the outer side wall of the cooler cylinder.

4. The boiler reheat spray desuperheater according to claim 1, characterized in that: A preset gap is left between the lower end of the water spray pipe and the inner side wall of the inner sleeve.

5. The boiler reheat spray desuperheater according to claim 4, characterized in that: The preset gap is 10-15 mm.

6. The boiler reheat spray desuperheater according to claim 1, characterized in that: The first end of the inner sleeve is fixedly connected to the side wall of the desuperheater cylinder by a plurality of fasteners, and the middle portion and the second end of the inner sleeve are circumferentially positioned by a plurality of positioning members.

7. The boiler reheat spray desuperheater according to claim 6, characterized in that: A plurality of second threaded holes are circumferentially spaced apart on the side wall of the cooler cylinder, and a plurality of second insertion holes are circumferentially spaced apart on the side wall of the inner sleeve; the inner end portion of the fastener passes through the second threaded holes and the second insertion holes in sequence to extend into the inner sleeve, and is welded and fixed to the inner side wall of the inner sleeve; the outer end portion of the fastener is threadedly connected to the second threaded hole, and is welded and fixed to the outer wall of the cooler cylinder.

8. The boiler reheat spray desuperheater according to claim 7, characterized in that: A first positioning ring is sleeved and welded on the outer wall of the first end of the inner sleeve, and the step on the fastener can abut against the outer side wall of the first positioning ring.

9. The boiler reheat spray desuperheater according to claim 6, characterized in that: A plurality of third threaded holes are also circumferentially spaced apart on the side wall of the cooler cylinder. The positioning member passes through the third threaded holes and can abut against the outer wall of the inner sleeve. The outer end of the positioning member is threadedly connected to the third threaded hole and is welded and fixed to the outer wall of the cooler cylinder.

10. The boiler reheat spray desuperheater according to claim 9, characterized in that: A second positioning ring is sleeved and welded on the middle outer wall and the second end outer wall of the inner sleeve, and the inner end of the positioning member can abut against the corresponding outer side wall of the second positioning ring.

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